| /**************************************************************************** |
| * * |
| * GNAT COMPILER COMPONENTS * |
| * * |
| * D E C L * |
| * * |
| * C Implementation File * |
| * * |
| * Copyright (C) 1992-2018, Free Software Foundation, Inc. * |
| * * |
| * GNAT is free software; you can redistribute it and/or modify it under * |
| * terms of the GNU General Public License as published by the Free Soft- * |
| * ware Foundation; either version 3, or (at your option) any later ver- * |
| * sion. GNAT is distributed in the hope that it will be useful, but WITH- * |
| * OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY * |
| * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * |
| * for more details. You should have received a copy of the GNU General * |
| * Public License along with GCC; see the file COPYING3. If not see * |
| * <http://www.gnu.org/licenses/>. * |
| * * |
| * GNAT was originally developed by the GNAT team at New York University. * |
| * Extensive contributions were provided by Ada Core Technologies Inc. * |
| * * |
| ****************************************************************************/ |
| |
| #include "config.h" |
| #include "system.h" |
| #include "coretypes.h" |
| #include "target.h" |
| #include "tree.h" |
| #include "stringpool.h" |
| #include "diagnostic-core.h" |
| #include "alias.h" |
| #include "fold-const.h" |
| #include "stor-layout.h" |
| #include "tree-inline.h" |
| #include "demangle.h" |
| |
| #include "ada.h" |
| #include "types.h" |
| #include "atree.h" |
| #include "elists.h" |
| #include "namet.h" |
| #include "nlists.h" |
| #include "repinfo.h" |
| #include "snames.h" |
| #include "uintp.h" |
| #include "urealp.h" |
| #include "fe.h" |
| #include "sinfo.h" |
| #include "einfo.h" |
| #include "ada-tree.h" |
| #include "gigi.h" |
| |
| /* The "stdcall" convention is really supported on 32-bit x86/Windows only. |
| The following macro is a helper to avoid having to check for a Windows |
| specific attribute throughout this unit. */ |
| |
| #if TARGET_DLLIMPORT_DECL_ATTRIBUTES |
| #ifdef TARGET_64BIT |
| #define Has_Stdcall_Convention(E) \ |
| (!TARGET_64BIT && Convention (E) == Convention_Stdcall) |
| #else |
| #define Has_Stdcall_Convention(E) (Convention (E) == Convention_Stdcall) |
| #endif |
| #else |
| #define Has_Stdcall_Convention(E) 0 |
| #endif |
| |
| #define STDCALL_PREFIX "_imp__" |
| |
| /* Stack realignment is necessary for functions with foreign conventions when |
| the ABI doesn't mandate as much as what the compiler assumes - that is, up |
| to PREFERRED_STACK_BOUNDARY. |
| |
| Such realignment can be requested with a dedicated function type attribute |
| on the targets that support it. We define FOREIGN_FORCE_REALIGN_STACK to |
| characterize the situations where the attribute should be set. We rely on |
| compiler configuration settings for 'main' to decide. */ |
| |
| #ifdef MAIN_STACK_BOUNDARY |
| #define FOREIGN_FORCE_REALIGN_STACK \ |
| (MAIN_STACK_BOUNDARY < PREFERRED_STACK_BOUNDARY) |
| #else |
| #define FOREIGN_FORCE_REALIGN_STACK 0 |
| #endif |
| |
| struct incomplete |
| { |
| struct incomplete *next; |
| tree old_type; |
| Entity_Id full_type; |
| }; |
| |
| /* These variables are used to defer recursively expanding incomplete types |
| while we are processing a record, an array or a subprogram type. */ |
| static int defer_incomplete_level = 0; |
| static struct incomplete *defer_incomplete_list; |
| |
| /* This variable is used to delay expanding types coming from a limited with |
| clause and completed Taft Amendment types until the end of the spec. */ |
| static struct incomplete *defer_limited_with_list; |
| |
| typedef struct subst_pair_d { |
| tree discriminant; |
| tree replacement; |
| } subst_pair; |
| |
| |
| typedef struct variant_desc_d { |
| /* The type of the variant. */ |
| tree type; |
| |
| /* The associated field. */ |
| tree field; |
| |
| /* The value of the qualifier. */ |
| tree qual; |
| |
| /* The type of the variant after transformation. */ |
| tree new_type; |
| |
| /* The auxiliary data. */ |
| tree aux; |
| } variant_desc; |
| |
| |
| /* A map used to cache the result of annotate_value. */ |
| struct value_annotation_hasher : ggc_cache_ptr_hash<tree_int_map> |
| { |
| static inline hashval_t |
| hash (tree_int_map *m) |
| { |
| return htab_hash_pointer (m->base.from); |
| } |
| |
| static inline bool |
| equal (tree_int_map *a, tree_int_map *b) |
| { |
| return a->base.from == b->base.from; |
| } |
| |
| static int |
| keep_cache_entry (tree_int_map *&m) |
| { |
| return ggc_marked_p (m->base.from); |
| } |
| }; |
| |
| static GTY ((cache)) hash_table<value_annotation_hasher> *annotate_value_cache; |
| |
| /* A map used to associate a dummy type with a list of subprogram entities. */ |
| struct GTY((for_user)) tree_entity_vec_map |
| { |
| struct tree_map_base base; |
| vec<Entity_Id, va_gc_atomic> *to; |
| }; |
| |
| void |
| gt_pch_nx (Entity_Id &) |
| { |
| } |
| |
| void |
| gt_pch_nx (Entity_Id *x, gt_pointer_operator op, void *cookie) |
| { |
| op (x, cookie); |
| } |
| |
| struct dummy_type_hasher : ggc_cache_ptr_hash<tree_entity_vec_map> |
| { |
| static inline hashval_t |
| hash (tree_entity_vec_map *m) |
| { |
| return htab_hash_pointer (m->base.from); |
| } |
| |
| static inline bool |
| equal (tree_entity_vec_map *a, tree_entity_vec_map *b) |
| { |
| return a->base.from == b->base.from; |
| } |
| |
| static int |
| keep_cache_entry (tree_entity_vec_map *&m) |
| { |
| return ggc_marked_p (m->base.from); |
| } |
| }; |
| |
| static GTY ((cache)) hash_table<dummy_type_hasher> *dummy_to_subprog_map; |
| |
| static void prepend_one_attribute (struct attrib **, |
| enum attrib_type, tree, tree, Node_Id); |
| static void prepend_one_attribute_pragma (struct attrib **, Node_Id); |
| static void prepend_attributes (struct attrib **, Entity_Id); |
| static tree elaborate_expression (Node_Id, Entity_Id, const char *, bool, bool, |
| bool); |
| static bool type_has_variable_size (tree); |
| static tree elaborate_expression_1 (tree, Entity_Id, const char *, bool, bool); |
| static tree elaborate_expression_2 (tree, Entity_Id, const char *, bool, bool, |
| unsigned int); |
| static tree elaborate_reference (tree, Entity_Id, bool, tree *); |
| static tree gnat_to_gnu_component_type (Entity_Id, bool, bool); |
| static tree gnat_to_gnu_subprog_type (Entity_Id, bool, bool, tree *); |
| static int adjust_packed (tree, tree, int); |
| static tree gnat_to_gnu_field (Entity_Id, tree, int, bool, bool); |
| static enum inline_status_t inline_status_for_subprog (Entity_Id); |
| static tree gnu_ext_name_for_subprog (Entity_Id, tree); |
| static void set_nonaliased_component_on_array_type (tree); |
| static void set_reverse_storage_order_on_array_type (tree); |
| static bool same_discriminant_p (Entity_Id, Entity_Id); |
| static bool array_type_has_nonaliased_component (tree, Entity_Id); |
| static bool compile_time_known_address_p (Node_Id); |
| static bool cannot_be_superflat (Node_Id); |
| static bool constructor_address_p (tree); |
| static bool allocatable_size_p (tree, bool); |
| static bool initial_value_needs_conversion (tree, tree); |
| static int compare_field_bitpos (const PTR, const PTR); |
| static bool components_to_record (Node_Id, Entity_Id, tree, tree, int, bool, |
| bool, bool, bool, bool, bool, bool, tree, |
| tree *); |
| static Uint annotate_value (tree); |
| static void annotate_rep (Entity_Id, tree); |
| static tree build_position_list (tree, bool, tree, tree, unsigned int, tree); |
| static vec<subst_pair> build_subst_list (Entity_Id, Entity_Id, bool); |
| static vec<variant_desc> build_variant_list (tree, vec<subst_pair>, |
| vec<variant_desc>); |
| static tree validate_size (Uint, tree, Entity_Id, enum tree_code, bool, bool); |
| static void set_rm_size (Uint, tree, Entity_Id); |
| static unsigned int validate_alignment (Uint, Entity_Id, unsigned int); |
| static unsigned int promote_object_alignment (tree, Entity_Id); |
| static void check_ok_for_atomic_type (tree, Entity_Id, bool); |
| static tree create_field_decl_from (tree, tree, tree, tree, tree, |
| vec<subst_pair>); |
| static tree create_rep_part (tree, tree, tree); |
| static tree get_rep_part (tree); |
| static tree create_variant_part_from (tree, vec<variant_desc>, tree, |
| tree, vec<subst_pair>, bool); |
| static void copy_and_substitute_in_size (tree, tree, vec<subst_pair>); |
| static void copy_and_substitute_in_layout (Entity_Id, Entity_Id, tree, tree, |
| vec<subst_pair>, bool); |
| static void associate_original_type_to_packed_array (tree, Entity_Id); |
| static const char *get_entity_char (Entity_Id); |
| |
| /* The relevant constituents of a subprogram binding to a GCC builtin. Used |
| to pass around calls performing profile compatibility checks. */ |
| |
| typedef struct { |
| Entity_Id gnat_entity; /* The Ada subprogram entity. */ |
| tree ada_fntype; /* The corresponding GCC type node. */ |
| tree btin_fntype; /* The GCC builtin function type node. */ |
| } intrin_binding_t; |
| |
| static bool intrin_profiles_compatible_p (intrin_binding_t *); |
| |
| /* Given GNAT_ENTITY, a GNAT defining identifier node, which denotes some Ada |
| entity, return the equivalent GCC tree for that entity (a ..._DECL node) |
| and associate the ..._DECL node with the input GNAT defining identifier. |
| |
| If GNAT_ENTITY is a variable or a constant declaration, GNU_EXPR gives its |
| initial value (in GCC tree form). This is optional for a variable. For |
| a renamed entity, GNU_EXPR gives the object being renamed. |
| |
| DEFINITION is true if this call is intended for a definition. This is used |
| for separate compilation where it is necessary to know whether an external |
| declaration or a definition must be created if the GCC equivalent was not |
| created previously. */ |
| |
| tree |
| gnat_to_gnu_entity (Entity_Id gnat_entity, tree gnu_expr, bool definition) |
| { |
| /* The construct that declared the entity. */ |
| const Node_Id gnat_decl = Declaration_Node (gnat_entity); |
| /* The kind of the entity. */ |
| const Entity_Kind kind = Ekind (gnat_entity); |
| /* True if this is a type. */ |
| const bool is_type = IN (kind, Type_Kind); |
| /* True if this is an artificial entity. */ |
| const bool artificial_p = !Comes_From_Source (gnat_entity); |
| /* True if debug info is requested for this entity. */ |
| const bool debug_info_p = Needs_Debug_Info (gnat_entity); |
| /* True if this entity is to be considered as imported. */ |
| const bool imported_p |
| = (Is_Imported (gnat_entity) && No (Address_Clause (gnat_entity))); |
| /* True if this entity has a foreign convention. */ |
| const bool foreign = Has_Foreign_Convention (gnat_entity); |
| /* For a type, contains the equivalent GNAT node to be used in gigi. */ |
| Entity_Id gnat_equiv_type = Empty; |
| /* For a type, contains the GNAT node to be used for back-annotation. */ |
| Entity_Id gnat_annotate_type = Empty; |
| /* Temporary used to walk the GNAT tree. */ |
| Entity_Id gnat_temp; |
| /* Contains the GCC DECL node which is equivalent to the input GNAT node. |
| This node will be associated with the GNAT node by calling at the end |
| of the `switch' statement. */ |
| tree gnu_decl = NULL_TREE; |
| /* Contains the GCC type to be used for the GCC node. */ |
| tree gnu_type = NULL_TREE; |
| /* Contains the GCC size tree to be used for the GCC node. */ |
| tree gnu_size = NULL_TREE; |
| /* Contains the GCC name to be used for the GCC node. */ |
| tree gnu_entity_name; |
| /* True if we have already saved gnu_decl as a GNAT association. */ |
| bool saved = false; |
| /* True if we incremented defer_incomplete_level. */ |
| bool this_deferred = false; |
| /* True if we incremented force_global. */ |
| bool this_global = false; |
| /* True if we should check to see if elaborated during processing. */ |
| bool maybe_present = false; |
| /* True if we made GNU_DECL and its type here. */ |
| bool this_made_decl = false; |
| /* Size and alignment of the GCC node, if meaningful. */ |
| unsigned int esize = 0, align = 0; |
| /* Contains the list of attributes directly attached to the entity. */ |
| struct attrib *attr_list = NULL; |
| |
| /* Since a use of an Itype is a definition, process it as such if it is in |
| the main unit, except for E_Access_Subtype because it's actually a use |
| of its base type, and for E_Record_Subtype with cloned subtype because |
| it's actually a use of the cloned subtype, see below. */ |
| if (!definition |
| && is_type |
| && Is_Itype (gnat_entity) |
| && !(kind == E_Access_Subtype |
| || (kind == E_Record_Subtype |
| && Present (Cloned_Subtype (gnat_entity)))) |
| && !present_gnu_tree (gnat_entity) |
| && In_Extended_Main_Code_Unit (gnat_entity)) |
| { |
| /* Ensure that we are in a subprogram mentioned in the Scope chain of |
| this entity, our current scope is global, or we encountered a task |
| or entry (where we can't currently accurately check scoping). */ |
| if (!current_function_decl |
| || DECL_ELABORATION_PROC_P (current_function_decl)) |
| { |
| process_type (gnat_entity); |
| return get_gnu_tree (gnat_entity); |
| } |
| |
| for (gnat_temp = Scope (gnat_entity); |
| Present (gnat_temp); |
| gnat_temp = Scope (gnat_temp)) |
| { |
| if (Is_Type (gnat_temp)) |
| gnat_temp = Underlying_Type (gnat_temp); |
| |
| if (Ekind (gnat_temp) == E_Subprogram_Body) |
| gnat_temp |
| = Corresponding_Spec (Parent (Declaration_Node (gnat_temp))); |
| |
| if (Is_Subprogram (gnat_temp) |
| && Present (Protected_Body_Subprogram (gnat_temp))) |
| gnat_temp = Protected_Body_Subprogram (gnat_temp); |
| |
| if (Ekind (gnat_temp) == E_Entry |
| || Ekind (gnat_temp) == E_Entry_Family |
| || Ekind (gnat_temp) == E_Task_Type |
| || (Is_Subprogram (gnat_temp) |
| && present_gnu_tree (gnat_temp) |
| && (current_function_decl |
| == gnat_to_gnu_entity (gnat_temp, NULL_TREE, false)))) |
| { |
| process_type (gnat_entity); |
| return get_gnu_tree (gnat_entity); |
| } |
| } |
| |
| /* This abort means the Itype has an incorrect scope, i.e. that its |
| scope does not correspond to the subprogram it is declared in. */ |
| gcc_unreachable (); |
| } |
| |
| /* If we've already processed this entity, return what we got last time. |
| If we are defining the node, we should not have already processed it. |
| In that case, we will abort below when we try to save a new GCC tree |
| for this object. We also need to handle the case of getting a dummy |
| type when a Full_View exists but be careful so as not to trigger its |
| premature elaboration. */ |
| if ((!definition || (is_type && imported_p)) |
| && present_gnu_tree (gnat_entity)) |
| { |
| gnu_decl = get_gnu_tree (gnat_entity); |
| |
| if (TREE_CODE (gnu_decl) == TYPE_DECL |
| && TYPE_IS_DUMMY_P (TREE_TYPE (gnu_decl)) |
| && IN (kind, Incomplete_Or_Private_Kind) |
| && Present (Full_View (gnat_entity)) |
| && (present_gnu_tree (Full_View (gnat_entity)) |
| || No (Freeze_Node (Full_View (gnat_entity))))) |
| { |
| gnu_decl |
| = gnat_to_gnu_entity (Full_View (gnat_entity), NULL_TREE, false); |
| save_gnu_tree (gnat_entity, NULL_TREE, false); |
| save_gnu_tree (gnat_entity, gnu_decl, false); |
| } |
| |
| return gnu_decl; |
| } |
| |
| /* If this is a numeric or enumeral type, or an access type, a nonzero Esize |
| must be specified unless it was specified by the programmer. Exceptions |
| are for access-to-protected-subprogram types and all access subtypes, as |
| another GNAT type is used to lay out the GCC type for them. */ |
| gcc_assert (!is_type |
| || Known_Esize (gnat_entity) |
| || Has_Size_Clause (gnat_entity) |
| || (!IN (kind, Numeric_Kind) |
| && !IN (kind, Enumeration_Kind) |
| && (!IN (kind, Access_Kind) |
| || kind == E_Access_Protected_Subprogram_Type |
| || kind == E_Anonymous_Access_Protected_Subprogram_Type |
| || kind == E_Access_Subtype |
| || type_annotate_only))); |
| |
| /* The RM size must be specified for all discrete and fixed-point types. */ |
| gcc_assert (!(IN (kind, Discrete_Or_Fixed_Point_Kind) |
| && Unknown_RM_Size (gnat_entity))); |
| |
| /* If we get here, it means we have not yet done anything with this entity. |
| If we are not defining it, it must be a type or an entity that is defined |
| elsewhere or externally, otherwise we should have defined it already. */ |
| gcc_assert (definition |
| || type_annotate_only |
| || is_type |
| || kind == E_Discriminant |
| || kind == E_Component |
| || kind == E_Label |
| || (kind == E_Constant && Present (Full_View (gnat_entity))) |
| || Is_Public (gnat_entity)); |
| |
| /* Get the name of the entity and set up the line number and filename of |
| the original definition for use in any decl we make. Make sure we do |
| not inherit another source location. */ |
| gnu_entity_name = get_entity_name (gnat_entity); |
| if (!renaming_from_instantiation_p (gnat_entity)) |
| Sloc_to_locus (Sloc (gnat_entity), &input_location); |
| |
| /* For cases when we are not defining (i.e., we are referencing from |
| another compilation unit) public entities, show we are at global level |
| for the purpose of computing scopes. Don't do this for components or |
| discriminants since the relevant test is whether or not the record is |
| being defined. */ |
| if (!definition |
| && kind != E_Component |
| && kind != E_Discriminant |
| && Is_Public (gnat_entity) |
| && !Is_Statically_Allocated (gnat_entity)) |
| force_global++, this_global = true; |
| |
| /* Handle any attributes directly attached to the entity. */ |
| if (Has_Gigi_Rep_Item (gnat_entity)) |
| prepend_attributes (&attr_list, gnat_entity); |
| |
| /* Do some common processing for types. */ |
| if (is_type) |
| { |
| /* Compute the equivalent type to be used in gigi. */ |
| gnat_equiv_type = Gigi_Equivalent_Type (gnat_entity); |
| |
| /* Machine_Attributes on types are expected to be propagated to |
| subtypes. The corresponding Gigi_Rep_Items are only attached |
| to the first subtype though, so we handle the propagation here. */ |
| if (Base_Type (gnat_entity) != gnat_entity |
| && !Is_First_Subtype (gnat_entity) |
| && Has_Gigi_Rep_Item (First_Subtype (Base_Type (gnat_entity)))) |
| prepend_attributes (&attr_list, |
| First_Subtype (Base_Type (gnat_entity))); |
| |
| /* Compute a default value for the size of an elementary type. */ |
| if (Known_Esize (gnat_entity) && Is_Elementary_Type (gnat_entity)) |
| { |
| unsigned int max_esize; |
| |
| gcc_assert (UI_Is_In_Int_Range (Esize (gnat_entity))); |
| esize = UI_To_Int (Esize (gnat_entity)); |
| |
| if (IN (kind, Float_Kind)) |
| max_esize = fp_prec_to_size (LONG_DOUBLE_TYPE_SIZE); |
| else if (IN (kind, Access_Kind)) |
| max_esize = POINTER_SIZE * 2; |
| else |
| max_esize = LONG_LONG_TYPE_SIZE; |
| |
| if (esize > max_esize) |
| esize = max_esize; |
| } |
| } |
| |
| switch (kind) |
| { |
| case E_Component: |
| case E_Discriminant: |
| { |
| /* The GNAT record where the component was defined. */ |
| Entity_Id gnat_record = Underlying_Type (Scope (gnat_entity)); |
| |
| /* If the entity is a discriminant of an extended tagged type used to |
| rename a discriminant of the parent type, return the latter. */ |
| if (kind == E_Discriminant |
| && Present (Corresponding_Discriminant (gnat_entity)) |
| && Is_Tagged_Type (gnat_record)) |
| { |
| gnu_decl |
| = gnat_to_gnu_entity (Corresponding_Discriminant (gnat_entity), |
| gnu_expr, definition); |
| saved = true; |
| break; |
| } |
| |
| /* If the entity is an inherited component (in the case of extended |
| tagged record types), just return the original entity, which must |
| be a FIELD_DECL. Likewise for discriminants. If the entity is a |
| non-girder discriminant (in the case of derived untagged record |
| types), return the stored discriminant it renames. */ |
| if (Present (Original_Record_Component (gnat_entity)) |
| && Original_Record_Component (gnat_entity) != gnat_entity) |
| { |
| gnu_decl |
| = gnat_to_gnu_entity (Original_Record_Component (gnat_entity), |
| gnu_expr, definition); |
| /* GNU_DECL contains a PLACEHOLDER_EXPR for discriminants. */ |
| if (kind == E_Discriminant) |
| saved = true; |
| break; |
| } |
| |
| /* Otherwise, if we are not defining this and we have no GCC type |
| for the containing record, make one for it. Then we should |
| have made our own equivalent. */ |
| if (!definition && !present_gnu_tree (gnat_record)) |
| { |
| /* ??? If this is in a record whose scope is a protected |
| type and we have an Original_Record_Component, use it. |
| This is a workaround for major problems in protected type |
| handling. */ |
| Entity_Id Scop = Scope (Scope (gnat_entity)); |
| if (Is_Protected_Type (Underlying_Type (Scop)) |
| && Present (Original_Record_Component (gnat_entity))) |
| { |
| gnu_decl |
| = gnat_to_gnu_entity (Original_Record_Component |
| (gnat_entity), |
| gnu_expr, false); |
| } |
| else |
| { |
| gnat_to_gnu_entity (Scope (gnat_entity), NULL_TREE, false); |
| gnu_decl = get_gnu_tree (gnat_entity); |
| } |
| |
| saved = true; |
| break; |
| } |
| |
| /* Here we have no GCC type and this is a reference rather than a |
| definition. This should never happen. Most likely the cause is |
| reference before declaration in the GNAT tree for gnat_entity. */ |
| gcc_unreachable (); |
| } |
| |
| case E_Constant: |
| /* Ignore constant definitions already marked with the error node. See |
| the N_Object_Declaration case of gnat_to_gnu for the rationale. */ |
| if (definition |
| && present_gnu_tree (gnat_entity) |
| && get_gnu_tree (gnat_entity) == error_mark_node) |
| { |
| maybe_present = true; |
| break; |
| } |
| |
| /* Ignore deferred constant definitions without address clause since |
| they are processed fully in the front-end. If No_Initialization |
| is set, this is not a deferred constant but a constant whose value |
| is built manually. And constants that are renamings are handled |
| like variables. */ |
| if (definition |
| && !gnu_expr |
| && No (Address_Clause (gnat_entity)) |
| && !No_Initialization (gnat_decl) |
| && No (Renamed_Object (gnat_entity))) |
| { |
| gnu_decl = error_mark_node; |
| saved = true; |
| break; |
| } |
| |
| /* If this is a use of a deferred constant without address clause, |
| get its full definition. */ |
| if (!definition |
| && No (Address_Clause (gnat_entity)) |
| && Present (Full_View (gnat_entity))) |
| { |
| gnu_decl |
| = gnat_to_gnu_entity (Full_View (gnat_entity), gnu_expr, false); |
| saved = true; |
| break; |
| } |
| |
| /* If we have a constant that we are not defining, get the expression it |
| was defined to represent. This is necessary to avoid generating dumb |
| elaboration code in simple cases, but we may throw it away later if it |
| is not a constant. But do not do it for dispatch tables because they |
| are only referenced indirectly and we need to have a consistent view |
| of the exported and of the imported declarations of the tables from |
| external units for them to be properly merged in LTO mode. Moreover |
| simply do not retrieve the expression it if it is an allocator since |
| the designated type might still be dummy at this point. Note that we |
| invoke gnat_to_gnu_external and not gnat_to_gnu because the expression |
| may contain N_Expression_With_Actions nodes and thus declarations of |
| objects from other units that we need to discard. */ |
| if (!definition |
| && !No_Initialization (gnat_decl) |
| && !Is_Dispatch_Table_Entity (gnat_entity) |
| && Present (gnat_temp = Expression (gnat_decl)) |
| && Nkind (gnat_temp) != N_Allocator) |
| gnu_expr = gnat_to_gnu_external (gnat_temp); |
| |
| /* ... fall through ... */ |
| |
| case E_Exception: |
| case E_Loop_Parameter: |
| case E_Out_Parameter: |
| case E_Variable: |
| { |
| const Entity_Id gnat_type = Etype (gnat_entity); |
| /* Always create a variable for volatile objects and variables seen |
| constant but with a Linker_Section pragma. */ |
| bool const_flag |
| = ((kind == E_Constant || kind == E_Variable) |
| && Is_True_Constant (gnat_entity) |
| && !(kind == E_Variable |
| && Present (Linker_Section_Pragma (gnat_entity))) |
| && !Treat_As_Volatile (gnat_entity) |
| && (((Nkind (gnat_decl) == N_Object_Declaration) |
| && Present (Expression (gnat_decl))) |
| || Present (Renamed_Object (gnat_entity)) |
| || imported_p)); |
| bool inner_const_flag = const_flag; |
| bool static_flag = Is_Statically_Allocated (gnat_entity); |
| /* We implement RM 13.3(19) for exported and imported (non-constant) |
| objects by making them volatile. */ |
| bool volatile_flag |
| = (Treat_As_Volatile (gnat_entity) |
| || (!const_flag && (Is_Exported (gnat_entity) || imported_p))); |
| bool mutable_p = false; |
| bool used_by_ref = false; |
| tree gnu_ext_name = NULL_TREE; |
| tree renamed_obj = NULL_TREE; |
| tree gnu_ada_size = NULL_TREE; |
| |
| /* We need to translate the renamed object even though we are only |
| referencing the renaming. But it may contain a call for which |
| we'll generate a temporary to hold the return value and which |
| is part of the definition of the renaming, so discard it. */ |
| if (Present (Renamed_Object (gnat_entity)) && !definition) |
| { |
| if (kind == E_Exception) |
| gnu_expr = gnat_to_gnu_entity (Renamed_Entity (gnat_entity), |
| NULL_TREE, false); |
| else |
| gnu_expr = gnat_to_gnu_external (Renamed_Object (gnat_entity)); |
| } |
| |
| /* Get the type after elaborating the renamed object. */ |
| if (foreign && Is_Descendant_Of_Address (Underlying_Type (gnat_type))) |
| gnu_type = ptr_type_node; |
| else |
| { |
| gnu_type = gnat_to_gnu_type (gnat_type); |
| |
| /* If this is a standard exception definition, use the standard |
| exception type. This is necessary to make sure that imported |
| and exported views of exceptions are merged in LTO mode. */ |
| if (TREE_CODE (TYPE_NAME (gnu_type)) == TYPE_DECL |
| && DECL_NAME (TYPE_NAME (gnu_type)) == exception_data_name_id) |
| gnu_type = except_type_node; |
| } |
| |
| /* For a debug renaming declaration, build a debug-only entity. */ |
| if (Present (Debug_Renaming_Link (gnat_entity))) |
| { |
| /* Force a non-null value to make sure the symbol is retained. */ |
| tree value = build1 (INDIRECT_REF, gnu_type, |
| build1 (NOP_EXPR, |
| build_pointer_type (gnu_type), |
| integer_minus_one_node)); |
| gnu_decl = build_decl (input_location, |
| VAR_DECL, gnu_entity_name, gnu_type); |
| SET_DECL_VALUE_EXPR (gnu_decl, value); |
| DECL_HAS_VALUE_EXPR_P (gnu_decl) = 1; |
| TREE_STATIC (gnu_decl) = global_bindings_p (); |
| gnat_pushdecl (gnu_decl, gnat_entity); |
| break; |
| } |
| |
| /* If this is a loop variable, its type should be the base type. |
| This is because the code for processing a loop determines whether |
| a normal loop end test can be done by comparing the bounds of the |
| loop against those of the base type, which is presumed to be the |
| size used for computation. But this is not correct when the size |
| of the subtype is smaller than the type. */ |
| if (kind == E_Loop_Parameter) |
| gnu_type = get_base_type (gnu_type); |
| |
| /* Reject non-renamed objects whose type is an unconstrained array or |
| any object whose type is a dummy type or void. */ |
| if ((TREE_CODE (gnu_type) == UNCONSTRAINED_ARRAY_TYPE |
| && No (Renamed_Object (gnat_entity))) |
| || TYPE_IS_DUMMY_P (gnu_type) |
| || TREE_CODE (gnu_type) == VOID_TYPE) |
| { |
| gcc_assert (type_annotate_only); |
| if (this_global) |
| force_global--; |
| return error_mark_node; |
| } |
| |
| /* If an alignment is specified, use it if valid. Note that exceptions |
| are objects but don't have an alignment and there is also no point in |
| setting it for an address clause, since the final type of the object |
| will be a reference type. */ |
| if (Known_Alignment (gnat_entity) |
| && kind != E_Exception |
| && No (Address_Clause (gnat_entity))) |
| align = validate_alignment (Alignment (gnat_entity), gnat_entity, |
| TYPE_ALIGN (gnu_type)); |
| |
| /* Likewise, if a size is specified, use it if valid. */ |
| if (Known_Esize (gnat_entity)) |
| gnu_size |
| = validate_size (Esize (gnat_entity), gnu_type, gnat_entity, |
| VAR_DECL, false, Has_Size_Clause (gnat_entity)); |
| if (gnu_size) |
| { |
| gnu_type |
| = make_type_from_size (gnu_type, gnu_size, |
| Has_Biased_Representation (gnat_entity)); |
| |
| if (operand_equal_p (TYPE_SIZE (gnu_type), gnu_size, 0)) |
| gnu_size = NULL_TREE; |
| } |
| |
| /* If this object has self-referential size, it must be a record with |
| a default discriminant. We are supposed to allocate an object of |
| the maximum size in this case, unless it is a constant with an |
| initializing expression, in which case we can get the size from |
| that. Note that the resulting size may still be a variable, so |
| this may end up with an indirect allocation. */ |
| if (No (Renamed_Object (gnat_entity)) |
| && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type))) |
| { |
| if (gnu_expr && kind == E_Constant) |
| { |
| gnu_size = TYPE_SIZE (TREE_TYPE (gnu_expr)); |
| gnu_ada_size = TYPE_ADA_SIZE (TREE_TYPE (gnu_expr)); |
| if (CONTAINS_PLACEHOLDER_P (gnu_size)) |
| { |
| /* If the initializing expression is itself a constant, |
| despite having a nominal type with self-referential |
| size, we can get the size directly from it. */ |
| if (TREE_CODE (gnu_expr) == COMPONENT_REF |
| && TYPE_IS_PADDING_P |
| (TREE_TYPE (TREE_OPERAND (gnu_expr, 0))) |
| && TREE_CODE (TREE_OPERAND (gnu_expr, 0)) == VAR_DECL |
| && (TREE_READONLY (TREE_OPERAND (gnu_expr, 0)) |
| || DECL_READONLY_ONCE_ELAB |
| (TREE_OPERAND (gnu_expr, 0)))) |
| { |
| gnu_size = DECL_SIZE (TREE_OPERAND (gnu_expr, 0)); |
| gnu_ada_size = gnu_size; |
| } |
| else |
| { |
| gnu_size |
| = SUBSTITUTE_PLACEHOLDER_IN_EXPR (gnu_size, |
| gnu_expr); |
| gnu_ada_size |
| = SUBSTITUTE_PLACEHOLDER_IN_EXPR (gnu_ada_size, |
| gnu_expr); |
| } |
| } |
| } |
| /* We may have no GNU_EXPR because No_Initialization is |
| set even though there's an Expression. */ |
| else if (kind == E_Constant |
| && Nkind (gnat_decl) == N_Object_Declaration |
| && Present (Expression (gnat_decl))) |
| { |
| tree gnu_expr_type |
| = gnat_to_gnu_type (Etype (Expression (gnat_decl))); |
| gnu_size = TYPE_SIZE (gnu_expr_type); |
| gnu_ada_size = TYPE_ADA_SIZE (gnu_expr_type); |
| } |
| else |
| { |
| gnu_size = max_size (TYPE_SIZE (gnu_type), true); |
| /* We can be called on unconstrained arrays in this mode. */ |
| if (!type_annotate_only) |
| gnu_ada_size = max_size (TYPE_ADA_SIZE (gnu_type), true); |
| mutable_p = true; |
| } |
| |
| /* If the size isn't constant and we are at global level, call |
| elaborate_expression_1 to make a variable for it rather than |
| calculating it each time. */ |
| if (!TREE_CONSTANT (gnu_size) && global_bindings_p ()) |
| gnu_size = elaborate_expression_1 (gnu_size, gnat_entity, |
| "SIZE", definition, false); |
| } |
| |
| /* If the size is zero byte, make it one byte since some linkers have |
| troubles with zero-sized objects. If the object will have a |
| template, that will make it nonzero so don't bother. Also avoid |
| doing that for an object renaming or an object with an address |
| clause, as we would lose useful information on the view size |
| (e.g. for null array slices) and we are not allocating the object |
| here anyway. */ |
| if (((gnu_size |
| && integer_zerop (gnu_size) |
| && !TREE_OVERFLOW (gnu_size)) |
| || (TYPE_SIZE (gnu_type) |
| && integer_zerop (TYPE_SIZE (gnu_type)) |
| && !TREE_OVERFLOW (TYPE_SIZE (gnu_type)))) |
| && !Is_Constr_Subt_For_UN_Aliased (gnat_type) |
| && No (Renamed_Object (gnat_entity)) |
| && No (Address_Clause (gnat_entity))) |
| gnu_size = bitsize_unit_node; |
| |
| /* If this is an object with no specified size and alignment, and |
| if either it is atomic or we are not optimizing alignment for |
| space and it is composite and not an exception, an Out parameter |
| or a reference to another object, and the size of its type is a |
| constant, set the alignment to the smallest one which is not |
| smaller than the size, with an appropriate cap. */ |
| if (!gnu_size && align == 0 |
| && (Is_Atomic_Or_VFA (gnat_entity) |
| || (!Optimize_Alignment_Space (gnat_entity) |
| && kind != E_Exception |
| && kind != E_Out_Parameter |
| && Is_Composite_Type (gnat_type) |
| && !Is_Constr_Subt_For_UN_Aliased (gnat_type) |
| && !Is_Exported (gnat_entity) |
| && !imported_p |
| && No (Renamed_Object (gnat_entity)) |
| && No (Address_Clause (gnat_entity)))) |
| && TREE_CODE (TYPE_SIZE (gnu_type)) == INTEGER_CST) |
| align = promote_object_alignment (gnu_type, gnat_entity); |
| |
| /* If the object is set to have atomic components, find the component |
| type and validate it. |
| |
| ??? Note that we ignore Has_Volatile_Components on objects; it's |
| not at all clear what to do in that case. */ |
| if (Has_Atomic_Components (gnat_entity)) |
| { |
| tree gnu_inner = (TREE_CODE (gnu_type) == ARRAY_TYPE |
| ? TREE_TYPE (gnu_type) : gnu_type); |
| |
| while (TREE_CODE (gnu_inner) == ARRAY_TYPE |
| && TYPE_MULTI_ARRAY_P (gnu_inner)) |
| gnu_inner = TREE_TYPE (gnu_inner); |
| |
| check_ok_for_atomic_type (gnu_inner, gnat_entity, true); |
| } |
| |
| /* If this is an aliased object with an unconstrained array nominal |
| subtype, make a type that includes the template. We will either |
| allocate or create a variable of that type, see below. */ |
| if (Is_Constr_Subt_For_UN_Aliased (gnat_type) |
| && Is_Array_Type (Underlying_Type (gnat_type)) |
| && !type_annotate_only) |
| { |
| tree gnu_array = gnat_to_gnu_type (Base_Type (gnat_type)); |
| gnu_type |
| = build_unc_object_type_from_ptr (TREE_TYPE (gnu_array), |
| gnu_type, |
| concat_name (gnu_entity_name, |
| "UNC"), |
| debug_info_p); |
| } |
| |
| /* ??? If this is an object of CW type initialized to a value, try to |
| ensure that the object is sufficient aligned for this value, but |
| without pessimizing the allocation. This is a kludge necessary |
| because we don't support dynamic alignment. */ |
| if (align == 0 |
| && Ekind (gnat_type) == E_Class_Wide_Subtype |
| && No (Renamed_Object (gnat_entity)) |
| && No (Address_Clause (gnat_entity))) |
| align = get_target_system_allocator_alignment () * BITS_PER_UNIT; |
| |
| #ifdef MINIMUM_ATOMIC_ALIGNMENT |
| /* If the size is a constant and no alignment is specified, force |
| the alignment to be the minimum valid atomic alignment. The |
| restriction on constant size avoids problems with variable-size |
| temporaries; if the size is variable, there's no issue with |
| atomic access. Also don't do this for a constant, since it isn't |
| necessary and can interfere with constant replacement. Finally, |
| do not do it for Out parameters since that creates an |
| size inconsistency with In parameters. */ |
| if (align == 0 |
| && MINIMUM_ATOMIC_ALIGNMENT > TYPE_ALIGN (gnu_type) |
| && !FLOAT_TYPE_P (gnu_type) |
| && !const_flag && No (Renamed_Object (gnat_entity)) |
| && !imported_p && No (Address_Clause (gnat_entity)) |
| && kind != E_Out_Parameter |
| && (gnu_size ? TREE_CODE (gnu_size) == INTEGER_CST |
| : TREE_CODE (TYPE_SIZE (gnu_type)) == INTEGER_CST)) |
| align = MINIMUM_ATOMIC_ALIGNMENT; |
| #endif |
| |
| /* Make a new type with the desired size and alignment, if needed. |
| But do not take into account alignment promotions to compute the |
| size of the object. */ |
| tree gnu_object_size = gnu_size ? gnu_size : TYPE_SIZE (gnu_type); |
| if (gnu_size || align > 0) |
| { |
| tree orig_type = gnu_type; |
| |
| gnu_type = maybe_pad_type (gnu_type, gnu_size, align, gnat_entity, |
| false, false, definition, true); |
| |
| /* If the nominal subtype of the object is unconstrained and its |
| size is not fixed, compute the Ada size from the Ada size of |
| the subtype and/or the expression; this will make it possible |
| for gnat_type_max_size to easily compute a maximum size. */ |
| if (gnu_ada_size && gnu_size && !TREE_CONSTANT (gnu_size)) |
| SET_TYPE_ADA_SIZE (gnu_type, gnu_ada_size); |
| |
| /* If a padding record was made, declare it now since it will |
| never be declared otherwise. This is necessary to ensure |
| that its subtrees are properly marked. */ |
| if (gnu_type != orig_type && !DECL_P (TYPE_NAME (gnu_type))) |
| create_type_decl (TYPE_NAME (gnu_type), gnu_type, true, |
| debug_info_p, gnat_entity); |
| } |
| |
| /* Now check if the type of the object allows atomic access. */ |
| if (Is_Atomic_Or_VFA (gnat_entity)) |
| check_ok_for_atomic_type (gnu_type, gnat_entity, false); |
| |
| /* If this is a renaming, avoid as much as possible to create a new |
| object. However, in some cases, creating it is required because |
| renaming can be applied to objects that are not names in Ada. |
| This processing needs to be applied to the raw expression so as |
| to make it more likely to rename the underlying object. */ |
| if (Present (Renamed_Object (gnat_entity))) |
| { |
| /* If the renamed object had padding, strip off the reference to |
| the inner object and reset our type. */ |
| if ((TREE_CODE (gnu_expr) == COMPONENT_REF |
| && TYPE_IS_PADDING_P (TREE_TYPE (TREE_OPERAND (gnu_expr, 0)))) |
| /* Strip useless conversions around the object. */ |
| || gnat_useless_type_conversion (gnu_expr)) |
| { |
| gnu_expr = TREE_OPERAND (gnu_expr, 0); |
| gnu_type = TREE_TYPE (gnu_expr); |
| } |
| |
| /* Or else, if the renamed object has an unconstrained type with |
| default discriminant, use the padded type. */ |
| else if (type_is_padding_self_referential (TREE_TYPE (gnu_expr))) |
| gnu_type = TREE_TYPE (gnu_expr); |
| |
| /* Case 1: if this is a constant renaming stemming from a function |
| call, treat it as a normal object whose initial value is what |
| is being renamed. RM 3.3 says that the result of evaluating a |
| function call is a constant object. Therefore, it can be the |
| inner object of a constant renaming and the renaming must be |
| fully instantiated, i.e. it cannot be a reference to (part of) |
| an existing object. And treat other rvalues the same way. */ |
| tree inner = gnu_expr; |
| while (handled_component_p (inner) || CONVERT_EXPR_P (inner)) |
| inner = TREE_OPERAND (inner, 0); |
| /* Expand_Dispatching_Call can prepend a comparison of the tags |
| before the call to "=". */ |
| if (TREE_CODE (inner) == TRUTH_ANDIF_EXPR |
| || TREE_CODE (inner) == COMPOUND_EXPR) |
| inner = TREE_OPERAND (inner, 1); |
| if ((TREE_CODE (inner) == CALL_EXPR |
| && !call_is_atomic_load (inner)) |
| || TREE_CODE (inner) == CONSTRUCTOR |
| || CONSTANT_CLASS_P (inner) |
| || COMPARISON_CLASS_P (inner) |
| || BINARY_CLASS_P (inner) |
| || EXPRESSION_CLASS_P (inner) |
| /* We need to detect the case where a temporary is created to |
| hold the return value, since we cannot safely rename it at |
| top level as it lives only in the elaboration routine. */ |
| || (TREE_CODE (inner) == VAR_DECL |
| && DECL_RETURN_VALUE_P (inner)) |
| /* We also need to detect the case where the front-end creates |
| a dangling 'reference to a function call at top level and |
| substitutes it in the renaming, for example: |
| |
| q__b : boolean renames r__f.e (1); |
| |
| can be rewritten into: |
| |
| q__R1s : constant q__A2s := r__f'reference; |
| [...] |
| q__b : boolean renames q__R1s.all.e (1); |
| |
| We cannot safely rename the rewritten expression since the |
| underlying object lives only in the elaboration routine. */ |
| || (TREE_CODE (inner) == INDIRECT_REF |
| && (inner |
| = remove_conversions (TREE_OPERAND (inner, 0), true)) |
| && TREE_CODE (inner) == VAR_DECL |
| && DECL_RETURN_VALUE_P (inner))) |
| ; |
| |
| /* Case 2: if the renaming entity need not be materialized, use |
| the elaborated renamed expression for the renaming. But this |
| means that the caller is responsible for evaluating the address |
| of the renaming in the correct place for the definition case to |
| instantiate the SAVE_EXPRs. */ |
| else if (!Materialize_Entity (gnat_entity)) |
| { |
| tree init = NULL_TREE; |
| |
| gnu_decl |
| = elaborate_reference (gnu_expr, gnat_entity, definition, |
| &init); |
| |
| /* We cannot evaluate the first arm of a COMPOUND_EXPR in the |
| correct place for this case. */ |
| gcc_assert (!init); |
| |
| /* No DECL_EXPR will be created so the expression needs to be |
| marked manually because it will likely be shared. */ |
| if (global_bindings_p ()) |
| MARK_VISITED (gnu_decl); |
| |
| /* This assertion will fail if the renamed object isn't aligned |
| enough as to make it possible to honor the alignment set on |
| the renaming. */ |
| if (align) |
| { |
| unsigned int ralign = DECL_P (gnu_decl) |
| ? DECL_ALIGN (gnu_decl) |
| : TYPE_ALIGN (TREE_TYPE (gnu_decl)); |
| gcc_assert (ralign >= align); |
| } |
| |
| /* The expression might not be a DECL so save it manually. */ |
| save_gnu_tree (gnat_entity, gnu_decl, true); |
| saved = true; |
| annotate_object (gnat_entity, gnu_type, NULL_TREE, false); |
| break; |
| } |
| |
| /* Case 3: otherwise, make a constant pointer to the object we |
| are renaming and attach the object to the pointer after it is |
| elaborated. The object will be referenced directly instead |
| of indirectly via the pointer to avoid aliasing problems with |
| non-addressable entities. The pointer is called a "renaming" |
| pointer in this case. Note that we also need to preserve the |
| volatility of the renamed object through the indirection. */ |
| else |
| { |
| tree init = NULL_TREE; |
| |
| if (TREE_THIS_VOLATILE (gnu_expr) && !TYPE_VOLATILE (gnu_type)) |
| gnu_type |
| = change_qualified_type (gnu_type, TYPE_QUAL_VOLATILE); |
| gnu_type = build_reference_type (gnu_type); |
| used_by_ref = true; |
| const_flag = true; |
| volatile_flag = false; |
| inner_const_flag = TREE_READONLY (gnu_expr); |
| gnu_size = NULL_TREE; |
| |
| renamed_obj |
| = elaborate_reference (gnu_expr, gnat_entity, definition, |
| &init); |
| |
| /* The expression needs to be marked manually because it will |
| likely be shared, even for a definition since the ADDR_EXPR |
| built below can cause the first few nodes to be folded. */ |
| if (global_bindings_p ()) |
| MARK_VISITED (renamed_obj); |
| |
| if (type_annotate_only |
| && TREE_CODE (renamed_obj) == ERROR_MARK) |
| gnu_expr = NULL_TREE; |
| else |
| { |
| gnu_expr |
| = build_unary_op (ADDR_EXPR, gnu_type, renamed_obj); |
| if (init) |
| gnu_expr |
| = build_compound_expr (TREE_TYPE (gnu_expr), init, |
| gnu_expr); |
| } |
| } |
| } |
| |
| /* If we are defining an aliased object whose nominal subtype is |
| unconstrained, the object is a record that contains both the |
| template and the object. If there is an initializer, it will |
| have already been converted to the right type, but we need to |
| create the template if there is no initializer. */ |
| if (definition |
| && !gnu_expr |
| && TREE_CODE (gnu_type) == RECORD_TYPE |
| && (TYPE_CONTAINS_TEMPLATE_P (gnu_type) |
| /* Beware that padding might have been introduced above. */ |
| || (TYPE_PADDING_P (gnu_type) |
| && TREE_CODE (TREE_TYPE (TYPE_FIELDS (gnu_type))) |
| == RECORD_TYPE |
| && TYPE_CONTAINS_TEMPLATE_P |
| (TREE_TYPE (TYPE_FIELDS (gnu_type)))))) |
| { |
| tree template_field |
| = TYPE_PADDING_P (gnu_type) |
| ? TYPE_FIELDS (TREE_TYPE (TYPE_FIELDS (gnu_type))) |
| : TYPE_FIELDS (gnu_type); |
| vec<constructor_elt, va_gc> *v; |
| vec_alloc (v, 1); |
| tree t = build_template (TREE_TYPE (template_field), |
| TREE_TYPE (DECL_CHAIN (template_field)), |
| NULL_TREE); |
| CONSTRUCTOR_APPEND_ELT (v, template_field, t); |
| gnu_expr = gnat_build_constructor (gnu_type, v); |
| } |
| |
| /* Convert the expression to the type of the object if need be. */ |
| if (gnu_expr && initial_value_needs_conversion (gnu_type, gnu_expr)) |
| gnu_expr = convert (gnu_type, gnu_expr); |
| |
| /* If this is a pointer that doesn't have an initializing expression, |
| initialize it to NULL, unless the object is declared imported as |
| per RM B.1(24). */ |
| if (definition |
| && (POINTER_TYPE_P (gnu_type) || TYPE_IS_FAT_POINTER_P (gnu_type)) |
| && !gnu_expr |
| && !Is_Imported (gnat_entity)) |
| gnu_expr = integer_zero_node; |
| |
| /* If we are defining the object and it has an Address clause, we must |
| either get the address expression from the saved GCC tree for the |
| object if it has a Freeze node, or elaborate the address expression |
| here since the front-end has guaranteed that the elaboration has no |
| effects in this case. */ |
| if (definition && Present (Address_Clause (gnat_entity))) |
| { |
| const Node_Id gnat_clause = Address_Clause (gnat_entity); |
| const Node_Id gnat_address = Expression (gnat_clause); |
| tree gnu_address = present_gnu_tree (gnat_entity) |
| ? TREE_OPERAND (get_gnu_tree (gnat_entity), 0) |
| : gnat_to_gnu (gnat_address); |
| |
| save_gnu_tree (gnat_entity, NULL_TREE, false); |
| |
| /* Convert the type of the object to a reference type that can |
| alias everything as per RM 13.3(19). */ |
| if (volatile_flag && !TYPE_VOLATILE (gnu_type)) |
| gnu_type = change_qualified_type (gnu_type, TYPE_QUAL_VOLATILE); |
| gnu_type |
| = build_reference_type_for_mode (gnu_type, ptr_mode, true); |
| gnu_address = convert (gnu_type, gnu_address); |
| used_by_ref = true; |
| const_flag |
| = (!Is_Public (gnat_entity) |
| || compile_time_known_address_p (gnat_address)); |
| volatile_flag = false; |
| gnu_size = NULL_TREE; |
| |
| /* If this is an aliased object with an unconstrained array nominal |
| subtype, then it can overlay only another aliased object with an |
| unconstrained array nominal subtype and compatible template. */ |
| if (Is_Constr_Subt_For_UN_Aliased (gnat_type) |
| && Is_Array_Type (Underlying_Type (gnat_type)) |
| && !type_annotate_only) |
| { |
| tree rec_type = TREE_TYPE (gnu_type); |
| tree off = byte_position (DECL_CHAIN (TYPE_FIELDS (rec_type))); |
| |
| /* This is the pattern built for a regular object. */ |
| if (TREE_CODE (gnu_address) == POINTER_PLUS_EXPR |
| && TREE_OPERAND (gnu_address, 1) == off) |
| gnu_address = TREE_OPERAND (gnu_address, 0); |
| /* This is the pattern built for an overaligned object. */ |
| else if (TREE_CODE (gnu_address) == POINTER_PLUS_EXPR |
| && TREE_CODE (TREE_OPERAND (gnu_address, 1)) |
| == PLUS_EXPR |
| && TREE_OPERAND (TREE_OPERAND (gnu_address, 1), 1) |
| == off) |
| gnu_address |
| = build2 (POINTER_PLUS_EXPR, gnu_type, |
| TREE_OPERAND (gnu_address, 0), |
| TREE_OPERAND (TREE_OPERAND (gnu_address, 1), 0)); |
| else |
| { |
| post_error_ne ("aliased object& with unconstrained array " |
| "nominal subtype", gnat_clause, |
| gnat_entity); |
| post_error ("\\can overlay only aliased object with " |
| "compatible subtype", gnat_clause); |
| } |
| } |
| |
| /* If we don't have an initializing expression for the underlying |
| variable, the initializing expression for the pointer is the |
| specified address. Otherwise, we have to make a COMPOUND_EXPR |
| to assign both the address and the initial value. */ |
| if (!gnu_expr) |
| gnu_expr = gnu_address; |
| else |
| gnu_expr |
| = build2 (COMPOUND_EXPR, gnu_type, |
| build_binary_op (INIT_EXPR, NULL_TREE, |
| build_unary_op (INDIRECT_REF, |
| NULL_TREE, |
| gnu_address), |
| gnu_expr), |
| gnu_address); |
| } |
| |
| /* If it has an address clause and we are not defining it, mark it |
| as an indirect object. Likewise for Stdcall objects that are |
| imported. */ |
| if ((!definition && Present (Address_Clause (gnat_entity))) |
| || (imported_p && Has_Stdcall_Convention (gnat_entity))) |
| { |
| /* Convert the type of the object to a reference type that can |
| alias everything as per RM 13.3(19). */ |
| if (volatile_flag && !TYPE_VOLATILE (gnu_type)) |
| gnu_type = change_qualified_type (gnu_type, TYPE_QUAL_VOLATILE); |
| gnu_type |
| = build_reference_type_for_mode (gnu_type, ptr_mode, true); |
| used_by_ref = true; |
| const_flag = false; |
| volatile_flag = false; |
| gnu_size = NULL_TREE; |
| |
| /* No point in taking the address of an initializing expression |
| that isn't going to be used. */ |
| gnu_expr = NULL_TREE; |
| |
| /* If it has an address clause whose value is known at compile |
| time, make the object a CONST_DECL. This will avoid a |
| useless dereference. */ |
| if (Present (Address_Clause (gnat_entity))) |
| { |
| Node_Id gnat_address |
| = Expression (Address_Clause (gnat_entity)); |
| |
| if (compile_time_known_address_p (gnat_address)) |
| { |
| gnu_expr = gnat_to_gnu (gnat_address); |
| const_flag = true; |
| } |
| } |
| } |
| |
| /* If we are at top level and this object is of variable size, |
| make the actual type a hidden pointer to the real type and |
| make the initializer be a memory allocation and initialization. |
| Likewise for objects we aren't defining (presumed to be |
| external references from other packages), but there we do |
| not set up an initialization. |
| |
| If the object's size overflows, make an allocator too, so that |
| Storage_Error gets raised. Note that we will never free |
| such memory, so we presume it never will get allocated. */ |
| if (!allocatable_size_p (TYPE_SIZE_UNIT (gnu_type), |
| global_bindings_p () |
| || !definition |
| || static_flag) |
| || (gnu_size |
| && !allocatable_size_p (convert (sizetype, |
| size_binop |
| (CEIL_DIV_EXPR, gnu_size, |
| bitsize_unit_node)), |
| global_bindings_p () |
| || !definition |
| || static_flag))) |
| { |
| if (volatile_flag && !TYPE_VOLATILE (gnu_type)) |
| gnu_type = change_qualified_type (gnu_type, TYPE_QUAL_VOLATILE); |
| gnu_type = build_reference_type (gnu_type); |
| used_by_ref = true; |
| const_flag = true; |
| volatile_flag = false; |
| gnu_size = NULL_TREE; |
| |
| /* In case this was a aliased object whose nominal subtype is |
| unconstrained, the pointer above will be a thin pointer and |
| build_allocator will automatically make the template. |
| |
| If we have a template initializer only (that we made above), |
| pretend there is none and rely on what build_allocator creates |
| again anyway. Otherwise (if we have a full initializer), get |
| the data part and feed that to build_allocator. |
| |
| If we are elaborating a mutable object, tell build_allocator to |
| ignore a possibly simpler size from the initializer, if any, as |
| we must allocate the maximum possible size in this case. */ |
| if (definition && !imported_p) |
| { |
| tree gnu_alloc_type = TREE_TYPE (gnu_type); |
| |
| if (TREE_CODE (gnu_alloc_type) == RECORD_TYPE |
| && TYPE_CONTAINS_TEMPLATE_P (gnu_alloc_type)) |
| { |
| gnu_alloc_type |
| = TREE_TYPE (DECL_CHAIN (TYPE_FIELDS (gnu_alloc_type))); |
| |
| if (TREE_CODE (gnu_expr) == CONSTRUCTOR |
| && CONSTRUCTOR_NELTS (gnu_expr) == 1) |
| gnu_expr = NULL_TREE; |
| else |
| gnu_expr |
| = build_component_ref |
| (gnu_expr, |
| DECL_CHAIN (TYPE_FIELDS (TREE_TYPE (gnu_expr))), |
| false); |
| } |
| |
| if (TREE_CODE (TYPE_SIZE_UNIT (gnu_alloc_type)) == INTEGER_CST |
| && !valid_constant_size_p (TYPE_SIZE_UNIT (gnu_alloc_type))) |
| post_error ("?`Storage_Error` will be raised at run time!", |
| gnat_entity); |
| |
| gnu_expr |
| = build_allocator (gnu_alloc_type, gnu_expr, gnu_type, |
| Empty, Empty, gnat_entity, mutable_p); |
| } |
| else |
| gnu_expr = NULL_TREE; |
| } |
| |
| /* If this object would go into the stack and has an alignment larger |
| than the largest stack alignment the back-end can honor, resort to |
| a variable of "aligning type". */ |
| if (definition |
| && TYPE_ALIGN (gnu_type) > BIGGEST_ALIGNMENT |
| && !imported_p |
| && !static_flag |
| && !global_bindings_p ()) |
| { |
| /* Create the new variable. No need for extra room before the |
| aligned field as this is in automatic storage. */ |
| tree gnu_new_type |
| = make_aligning_type (gnu_type, TYPE_ALIGN (gnu_type), |
| TYPE_SIZE_UNIT (gnu_type), |
| BIGGEST_ALIGNMENT, 0, gnat_entity); |
| tree gnu_new_var |
| = create_var_decl (create_concat_name (gnat_entity, "ALIGN"), |
| NULL_TREE, gnu_new_type, NULL_TREE, |
| false, false, false, false, false, |
| true, debug_info_p && definition, NULL, |
| gnat_entity); |
| |
| /* Initialize the aligned field if we have an initializer. */ |
| if (gnu_expr) |
| add_stmt_with_node |
| (build_binary_op (INIT_EXPR, NULL_TREE, |
| build_component_ref |
| (gnu_new_var, TYPE_FIELDS (gnu_new_type), |
| false), |
| gnu_expr), |
| gnat_entity); |
| |
| /* And setup this entity as a reference to the aligned field. */ |
| gnu_type = build_reference_type (gnu_type); |
| gnu_expr |
| = build_unary_op |
| (ADDR_EXPR, NULL_TREE, |
| build_component_ref (gnu_new_var, TYPE_FIELDS (gnu_new_type), |
| false)); |
| TREE_CONSTANT (gnu_expr) = 1; |
| |
| used_by_ref = true; |
| const_flag = true; |
| volatile_flag = false; |
| gnu_size = NULL_TREE; |
| } |
| |
| /* If this is an aggregate constant initialized to a constant, force it |
| to be statically allocated. This saves an initialization copy. */ |
| if (!static_flag |
| && const_flag |
| && gnu_expr |
| && TREE_CONSTANT (gnu_expr) |
| && AGGREGATE_TYPE_P (gnu_type) |
| && tree_fits_uhwi_p (TYPE_SIZE_UNIT (gnu_type)) |
| && !(TYPE_IS_PADDING_P (gnu_type) |
| && !tree_fits_uhwi_p (TYPE_SIZE_UNIT |
| (TREE_TYPE (TYPE_FIELDS (gnu_type)))))) |
| static_flag = true; |
| |
| /* If this is an aliased object with an unconstrained array nominal |
| subtype, we make its type a thin reference, i.e. the reference |
| counterpart of a thin pointer, so it points to the array part. |
| This is aimed to make it easier for the debugger to decode the |
| object. Note that we have to do it this late because of the |
| couple of allocation adjustments that might be made above. */ |
| if (Is_Constr_Subt_For_UN_Aliased (gnat_type) |
| && Is_Array_Type (Underlying_Type (gnat_type)) |
| && !type_annotate_only) |
| { |
| /* In case the object with the template has already been allocated |
| just above, we have nothing to do here. */ |
| if (!TYPE_IS_THIN_POINTER_P (gnu_type)) |
| { |
| /* This variable is a GNAT encoding used by Workbench: let it |
| go through the debugging information but mark it as |
| artificial: users are not interested in it. */ |
| tree gnu_unc_var |
| = create_var_decl (concat_name (gnu_entity_name, "UNC"), |
| NULL_TREE, gnu_type, gnu_expr, |
| const_flag, Is_Public (gnat_entity), |
| imported_p || !definition, static_flag, |
| volatile_flag, true, |
| debug_info_p && definition, |
| NULL, gnat_entity); |
| gnu_expr = build_unary_op (ADDR_EXPR, NULL_TREE, gnu_unc_var); |
| TREE_CONSTANT (gnu_expr) = 1; |
| |
| used_by_ref = true; |
| const_flag = true; |
| volatile_flag = false; |
| inner_const_flag = TREE_READONLY (gnu_unc_var); |
| gnu_size = NULL_TREE; |
| } |
| |
| tree gnu_array = gnat_to_gnu_type (Base_Type (gnat_type)); |
| gnu_type |
| = build_reference_type (TYPE_OBJECT_RECORD_TYPE (gnu_array)); |
| } |
| |
| /* Convert the expression to the type of the object if need be. */ |
| if (gnu_expr && initial_value_needs_conversion (gnu_type, gnu_expr)) |
| gnu_expr = convert (gnu_type, gnu_expr); |
| |
| /* If this name is external or a name was specified, use it, but don't |
| use the Interface_Name with an address clause (see cd30005). */ |
| if ((Is_Public (gnat_entity) && !Is_Imported (gnat_entity)) |
| || (Present (Interface_Name (gnat_entity)) |
| && No (Address_Clause (gnat_entity)))) |
| gnu_ext_name = create_concat_name (gnat_entity, NULL); |
| |
| /* Deal with a pragma Linker_Section on a constant or variable. */ |
| if ((kind == E_Constant || kind == E_Variable) |
| && Present (Linker_Section_Pragma (gnat_entity))) |
| prepend_one_attribute_pragma (&attr_list, |
| Linker_Section_Pragma (gnat_entity)); |
| |
| /* Now create the variable or the constant and set various flags. */ |
| gnu_decl |
| = create_var_decl (gnu_entity_name, gnu_ext_name, gnu_type, |
| gnu_expr, const_flag, Is_Public (gnat_entity), |
| imported_p || !definition, static_flag, |
| volatile_flag, artificial_p, |
| debug_info_p && definition, attr_list, |
| gnat_entity, !renamed_obj); |
| DECL_BY_REF_P (gnu_decl) = used_by_ref; |
| DECL_POINTS_TO_READONLY_P (gnu_decl) = used_by_ref && inner_const_flag; |
| DECL_CAN_NEVER_BE_NULL_P (gnu_decl) = Can_Never_Be_Null (gnat_entity); |
| |
| /* If we are defining an Out parameter and optimization isn't enabled, |
| create a fake PARM_DECL for debugging purposes and make it point to |
| the VAR_DECL. Suppress debug info for the latter but make sure it |
| will live in memory so that it can be accessed from within the |
| debugger through the PARM_DECL. */ |
| if (kind == E_Out_Parameter |
| && definition |
| && debug_info_p |
| && !optimize |
| && !flag_generate_lto) |
| { |
| tree param = create_param_decl (gnu_entity_name, gnu_type); |
| gnat_pushdecl (param, gnat_entity); |
| SET_DECL_VALUE_EXPR (param, gnu_decl); |
| DECL_HAS_VALUE_EXPR_P (param) = 1; |
| DECL_IGNORED_P (gnu_decl) = 1; |
| TREE_ADDRESSABLE (gnu_decl) = 1; |
| } |
| |
| /* If this is a loop parameter, set the corresponding flag. */ |
| else if (kind == E_Loop_Parameter) |
| DECL_LOOP_PARM_P (gnu_decl) = 1; |
| |
| /* If this is a renaming pointer, attach the renamed object to it. */ |
| if (renamed_obj) |
| SET_DECL_RENAMED_OBJECT (gnu_decl, renamed_obj); |
| |
| /* If this is a constant and we are defining it or it generates a real |
| symbol at the object level and we are referencing it, we may want |
| or need to have a true variable to represent it: |
| - if optimization isn't enabled, for debugging purposes, |
| - if the constant is public and not overlaid on something else, |
| - if its address is taken, |
| - if either itself or its type is aliased. */ |
| if (TREE_CODE (gnu_decl) == CONST_DECL |
| && (definition || Sloc (gnat_entity) > Standard_Location) |
| && ((!optimize && debug_info_p) |
| || (Is_Public (gnat_entity) |
| && No (Address_Clause (gnat_entity))) |
| || Address_Taken (gnat_entity) |
| || Is_Aliased (gnat_entity) |
| || Is_Aliased (gnat_type))) |
| { |
| tree gnu_corr_var |
| = create_var_decl (gnu_entity_name, gnu_ext_name, gnu_type, |
| gnu_expr, true, Is_Public (gnat_entity), |
| !definition, static_flag, volatile_flag, |
| artificial_p, debug_info_p && definition, |
| attr_list, gnat_entity, false); |
| |
| SET_DECL_CONST_CORRESPONDING_VAR (gnu_decl, gnu_corr_var); |
| } |
| |
| /* If this is a constant, even if we don't need a true variable, we |
| may need to avoid returning the initializer in every case. That |
| can happen for the address of a (constant) constructor because, |
| upon dereferencing it, the constructor will be reinjected in the |
| tree, which may not be valid in every case; see lvalue_required_p |
| for more details. */ |
| if (TREE_CODE (gnu_decl) == CONST_DECL) |
| DECL_CONST_ADDRESS_P (gnu_decl) = constructor_address_p (gnu_expr); |
| |
| /* If this object is declared in a block that contains a block with an |
| exception handler, and we aren't using the GCC exception mechanism, |
| we must force this variable in memory in order to avoid an invalid |
| optimization. */ |
| if (Front_End_Exceptions () |
| && Has_Nested_Block_With_Handler (Scope (gnat_entity))) |
| TREE_ADDRESSABLE (gnu_decl) = 1; |
| |
| /* If this is a local variable with non-BLKmode and aggregate type, |
| and optimization isn't enabled, then force it in memory so that |
| a register won't be allocated to it with possible subparts left |
| uninitialized and reaching the register allocator. */ |
| else if (TREE_CODE (gnu_decl) == VAR_DECL |
| && !DECL_EXTERNAL (gnu_decl) |
| && !TREE_STATIC (gnu_decl) |
| && DECL_MODE (gnu_decl) != BLKmode |
| && AGGREGATE_TYPE_P (TREE_TYPE (gnu_decl)) |
| && !TYPE_IS_FAT_POINTER_P (TREE_TYPE (gnu_decl)) |
| && !optimize) |
| TREE_ADDRESSABLE (gnu_decl) = 1; |
| |
| /* If we are defining an object with variable size or an object with |
| fixed size that will be dynamically allocated, and we are using the |
| front-end setjmp/longjmp exception mechanism, update the setjmp |
| buffer. */ |
| if (definition |
| && Exception_Mechanism == Front_End_SJLJ |
| && get_block_jmpbuf_decl () |
| && DECL_SIZE_UNIT (gnu_decl) |
| && (TREE_CODE (DECL_SIZE_UNIT (gnu_decl)) != INTEGER_CST |
| || (flag_stack_check == GENERIC_STACK_CHECK |
| && compare_tree_int (DECL_SIZE_UNIT (gnu_decl), |
| STACK_CHECK_MAX_VAR_SIZE) > 0))) |
| add_stmt_with_node (build_call_n_expr |
| (update_setjmp_buf_decl, 1, |
| build_unary_op (ADDR_EXPR, NULL_TREE, |
| get_block_jmpbuf_decl ())), |
| gnat_entity); |
| |
| /* Back-annotate Esize and Alignment of the object if not already |
| known. Note that we pick the values of the type, not those of |
| the object, to shield ourselves from low-level platform-dependent |
| adjustments like alignment promotion. This is both consistent with |
| all the treatment above, where alignment and size are set on the |
| type of the object and not on the object directly, and makes it |
| possible to support all confirming representation clauses. */ |
| annotate_object (gnat_entity, TREE_TYPE (gnu_decl), gnu_object_size, |
| used_by_ref); |
| } |
| break; |
| |
| case E_Void: |
| /* Return a TYPE_DECL for "void" that we previously made. */ |
| gnu_decl = TYPE_NAME (void_type_node); |
| break; |
| |
| case E_Enumeration_Type: |
| /* A special case: for the types Character and Wide_Character in |
| Standard, we do not list all the literals. So if the literals |
| are not specified, make this an integer type. */ |
| if (No (First_Literal (gnat_entity))) |
| { |
| if (esize == CHAR_TYPE_SIZE && flag_signed_char) |
| gnu_type = make_signed_type (CHAR_TYPE_SIZE); |
| else |
| gnu_type = make_unsigned_type (esize); |
| TYPE_NAME (gnu_type) = gnu_entity_name; |
| |
| /* Set TYPE_STRING_FLAG for Character and Wide_Character types. |
| This is needed by the DWARF-2 back-end to distinguish between |
| unsigned integer types and character types. */ |
| TYPE_STRING_FLAG (gnu_type) = 1; |
| |
| /* This flag is needed by the call just below. */ |
| TYPE_ARTIFICIAL (gnu_type) = artificial_p; |
| |
| finish_character_type (gnu_type); |
| } |
| else |
| { |
| /* We have a list of enumeral constants in First_Literal. We make a |
| CONST_DECL for each one and build into GNU_LITERAL_LIST the list |
| to be placed into TYPE_FIELDS. Each node is itself a TREE_LIST |
| whose TREE_VALUE is the literal name and whose TREE_PURPOSE is the |
| value of the literal. But when we have a regular boolean type, we |
| simplify this a little by using a BOOLEAN_TYPE. */ |
| const bool is_boolean = Is_Boolean_Type (gnat_entity) |
| && !Has_Non_Standard_Rep (gnat_entity); |
| const bool is_unsigned = Is_Unsigned_Type (gnat_entity); |
| tree gnu_list = NULL_TREE; |
| Entity_Id gnat_literal; |
| |
| /* Boolean types with foreign convention have precision 1. */ |
| if (is_boolean && foreign) |
| esize = 1; |
| |
| gnu_type = make_node (is_boolean ? BOOLEAN_TYPE : ENUMERAL_TYPE); |
| TYPE_PRECISION (gnu_type) = esize; |
| TYPE_UNSIGNED (gnu_type) = is_unsigned; |
| set_min_and_max_values_for_integral_type (gnu_type, esize, |
| TYPE_SIGN (gnu_type)); |
| process_attributes (&gnu_type, &attr_list, true, gnat_entity); |
| layout_type (gnu_type); |
| |
| for (gnat_literal = First_Literal (gnat_entity); |
| Present (gnat_literal); |
| gnat_literal = Next_Literal (gnat_literal)) |
| { |
| tree gnu_value |
| = UI_To_gnu (Enumeration_Rep (gnat_literal), gnu_type); |
| /* Do not generate debug info for individual enumerators. */ |
| tree gnu_literal |
| = create_var_decl (get_entity_name (gnat_literal), NULL_TREE, |
| gnu_type, gnu_value, true, false, false, |
| false, false, artificial_p, false, |
| NULL, gnat_literal); |
| save_gnu_tree (gnat_literal, gnu_literal, false); |
| gnu_list |
| = tree_cons (DECL_NAME (gnu_literal), gnu_value, gnu_list); |
| } |
| |
| if (!is_boolean) |
| TYPE_VALUES (gnu_type) = nreverse (gnu_list); |
| |
| /* Note that the bounds are updated at the end of this function |
| to avoid an infinite recursion since they refer to the type. */ |
| goto discrete_type; |
| } |
| break; |
| |
| case E_Signed_Integer_Type: |
| /* For integer types, just make a signed type the appropriate number |
| of bits. */ |
| gnu_type = make_signed_type (esize); |
| goto discrete_type; |
| |
| case E_Ordinary_Fixed_Point_Type: |
| case E_Decimal_Fixed_Point_Type: |
| { |
| /* Small_Value is the scale factor. */ |
| const Ureal gnat_small_value = Small_Value (gnat_entity); |
| tree scale_factor = NULL_TREE; |
| |
| gnu_type = make_signed_type (esize); |
| |
| /* Try to decode the scale factor and to save it for the fixed-point |
| types debug hook. */ |
| |
| /* There are various ways to describe the scale factor, however there |
| are cases where back-end internals cannot hold it. In such cases, |
| we output invalid scale factor for such cases (i.e. the 0/0 |
| rational constant) but we expect GNAT to output GNAT encodings, |
| then. Thus, keep this in sync with |
| Exp_Dbug.Is_Handled_Scale_Factor. */ |
| |
| /* When encoded as 1/2**N or 1/10**N, describe the scale factor as a |
| binary or decimal scale: it is easier to read for humans. */ |
| if (UI_Eq (Numerator (gnat_small_value), Uint_1) |
| && (Rbase (gnat_small_value) == 2 |
| || Rbase (gnat_small_value) == 10)) |
| { |
| /* Given RM restrictions on 'Small values, we assume here that |
| the denominator fits in an int. */ |
| const tree base = build_int_cst (integer_type_node, |
| Rbase (gnat_small_value)); |
| const tree exponent |
| = build_int_cst (integer_type_node, |
| UI_To_Int (Denominator (gnat_small_value))); |
| scale_factor |
| = build2 (RDIV_EXPR, integer_type_node, |
| integer_one_node, |
| build2 (POWER_EXPR, integer_type_node, |
| base, exponent)); |
| } |
| |
| /* Default to arbitrary scale factors descriptions. */ |
| else |
| { |
| const Uint num = Norm_Num (gnat_small_value); |
| const Uint den = Norm_Den (gnat_small_value); |
| |
| if (UI_Is_In_Int_Range (num) && UI_Is_In_Int_Range (den)) |
| { |
| const tree gnu_num |
| = build_int_cst (integer_type_node, |
| UI_To_Int (Norm_Num (gnat_small_value))); |
| const tree gnu_den |
| = build_int_cst (integer_type_node, |
| UI_To_Int (Norm_Den (gnat_small_value))); |
| scale_factor = build2 (RDIV_EXPR, integer_type_node, |
| gnu_num, gnu_den); |
| } |
| else |
| /* If compiler internals cannot represent arbitrary scale |
| factors, output an invalid scale factor so that debugger |
| don't try to handle them but so that we still have a type |
| in the output. Note that GNAT */ |
| scale_factor = integer_zero_node; |
| } |
| |
| TYPE_FIXED_POINT_P (gnu_type) = 1; |
| SET_TYPE_SCALE_FACTOR (gnu_type, scale_factor); |
| } |
| goto discrete_type; |
| |
| case E_Modular_Integer_Type: |
| { |
| /* For modular types, make the unsigned type of the proper number |
| of bits and then set up the modulus, if required. */ |
| tree gnu_modulus, gnu_high = NULL_TREE; |
| |
| /* Packed Array Impl. Types are supposed to be subtypes only. */ |
| gcc_assert (!Is_Packed_Array_Impl_Type (gnat_entity)); |
| |
| gnu_type = make_unsigned_type (esize); |
| |
| /* Get the modulus in this type. If it overflows, assume it is because |
| it is equal to 2**Esize. Note that there is no overflow checking |
| done on unsigned type, so we detect the overflow by looking for |
| a modulus of zero, which is otherwise invalid. */ |
| gnu_modulus = UI_To_gnu (Modulus (gnat_entity), gnu_type); |
| |
| if (!integer_zerop (gnu_modulus)) |
| { |
| TYPE_MODULAR_P (gnu_type) = 1; |
| SET_TYPE_MODULUS (gnu_type, gnu_modulus); |
| gnu_high = fold_build2 (MINUS_EXPR, gnu_type, gnu_modulus, |
| build_int_cst (gnu_type, 1)); |
| } |
| |
| /* If the upper bound is not maximal, make an extra subtype. */ |
| if (gnu_high |
| && !tree_int_cst_equal (gnu_high, TYPE_MAX_VALUE (gnu_type))) |
| { |
| tree gnu_subtype = make_unsigned_type (esize); |
| SET_TYPE_RM_MAX_VALUE (gnu_subtype, gnu_high); |
| TREE_TYPE (gnu_subtype) = gnu_type; |
| TYPE_EXTRA_SUBTYPE_P (gnu_subtype) = 1; |
| TYPE_NAME (gnu_type) = create_concat_name (gnat_entity, "UMT"); |
| gnu_type = gnu_subtype; |
| } |
| } |
| goto discrete_type; |
| |
| case E_Signed_Integer_Subtype: |
| case E_Enumeration_Subtype: |
| case E_Modular_Integer_Subtype: |
| case E_Ordinary_Fixed_Point_Subtype: |
| case E_Decimal_Fixed_Point_Subtype: |
| |
| /* For integral subtypes, we make a new INTEGER_TYPE. Note that we do |
| not want to call create_range_type since we would like each subtype |
| node to be distinct. ??? Historically this was in preparation for |
| when memory aliasing is implemented, but that's obsolete now given |
| the call to relate_alias_sets below. |
| |
| The TREE_TYPE field of the INTEGER_TYPE points to the base type; |
| this fact is used by the arithmetic conversion functions. |
| |
| We elaborate the Ancestor_Subtype if it is not in the current unit |
| and one of our bounds is non-static. We do this to ensure consistent |
| naming in the case where several subtypes share the same bounds, by |
| elaborating the first such subtype first, thus using its name. */ |
| |
| if (!definition |
| && Present (Ancestor_Subtype (gnat_entity)) |
| && !In_Extended_Main_Code_Unit (Ancestor_Subtype (gnat_entity)) |
| && (!Compile_Time_Known_Value (Type_Low_Bound (gnat_entity)) |
| || !Compile_Time_Known_Value (Type_High_Bound (gnat_entity)))) |
| gnat_to_gnu_entity (Ancestor_Subtype (gnat_entity), gnu_expr, false); |
| |
| /* Set the precision to the Esize except for bit-packed arrays. */ |
| if (Is_Packed_Array_Impl_Type (gnat_entity) |
| && Is_Bit_Packed_Array (Original_Array_Type (gnat_entity))) |
| esize = UI_To_Int (RM_Size (gnat_entity)); |
| |
| /* Boolean types with foreign convention have precision 1. */ |
| if (Is_Boolean_Type (gnat_entity) && foreign) |
| { |
| gnu_type = make_node (BOOLEAN_TYPE); |
| TYPE_PRECISION (gnu_type) = 1; |
| TYPE_UNSIGNED (gnu_type) = 1; |
| set_min_and_max_values_for_integral_type (gnu_type, 1, UNSIGNED); |
| layout_type (gnu_type); |
| } |
| /* First subtypes of Character are treated as Character; otherwise |
| this should be an unsigned type if the base type is unsigned or |
| if the lower bound is constant and non-negative or if the type |
| is biased. However, even if the lower bound is constant and |
| non-negative, we use a signed type for a subtype with the same |
| size as its signed base type, because this eliminates useless |
| conversions to it and gives more leeway to the optimizer; but |
| this means that we will need to explicitly test for this case |
| when we change the representation based on the RM size. */ |
| else if (kind == E_Enumeration_Subtype |
| && No (First_Literal (Etype (gnat_entity))) |
| && Esize (gnat_entity) == RM_Size (gnat_entity) |
| && esize == CHAR_TYPE_SIZE |
| && flag_signed_char) |
| gnu_type = make_signed_type (CHAR_TYPE_SIZE); |
| else if (Is_Unsigned_Type (Underlying_Type (Etype (gnat_entity))) |
| || (Esize (Etype (gnat_entity)) != Esize (gnat_entity) |
| && Is_Unsigned_Type (gnat_entity)) |
| || Has_Biased_Representation (gnat_entity)) |
| gnu_type = make_unsigned_type (esize); |
| else |
| gnu_type = make_signed_type (esize); |
| TREE_TYPE (gnu_type) = get_unpadded_type (Etype (gnat_entity)); |
| |
| SET_TYPE_RM_MIN_VALUE |
| (gnu_type, elaborate_expression (Type_Low_Bound (gnat_entity), |
| gnat_entity, "L", definition, true, |
| debug_info_p)); |
| |
| SET_TYPE_RM_MAX_VALUE |
| (gnu_type, elaborate_expression (Type_High_Bound (gnat_entity), |
| gnat_entity, "U", definition, true, |
| debug_info_p)); |
| |
| if (TREE_CODE (gnu_type) == INTEGER_TYPE) |
| TYPE_BIASED_REPRESENTATION_P (gnu_type) |
| = Has_Biased_Representation (gnat_entity); |
| |
| /* Do the same processing for Character subtypes as for types. */ |
| if (TYPE_STRING_FLAG (TREE_TYPE (gnu_type))) |
| { |
| TYPE_NAME (gnu_type) = gnu_entity_name; |
| TYPE_STRING_FLAG (gnu_type) = 1; |
| TYPE_ARTIFICIAL (gnu_type) = artificial_p; |
| finish_character_type (gnu_type); |
| } |
| |
| /* Inherit our alias set from what we're a subtype of. Subtypes |
| are not different types and a pointer can designate any instance |
| within a subtype hierarchy. */ |
| relate_alias_sets (gnu_type, TREE_TYPE (gnu_type), ALIAS_SET_COPY); |
| |
| /* One of the above calls might have caused us to be elaborated, |
| so don't blow up if so. */ |
| if (present_gnu_tree (gnat_entity)) |
| { |
| maybe_present = true; |
| break; |
| } |
| |
| /* Attach the TYPE_STUB_DECL in case we have a parallel type. */ |
| TYPE_STUB_DECL (gnu_type) |
| = create_type_stub_decl (gnu_entity_name, gnu_type); |
| |
| /* For a packed array, make the original array type a parallel/debug |
| type. */ |
| if (debug_info_p && Is_Packed_Array_Impl_Type (gnat_entity)) |
| associate_original_type_to_packed_array (gnu_type, gnat_entity); |
| |
| discrete_type: |
| |
| /* We have to handle clauses that under-align the type specially. */ |
| if ((Present (Alignment_Clause (gnat_entity)) |
| || (Is_Packed_Array_Impl_Type (gnat_entity) |
| && Present |
| (Alignment_Clause (Original_Array_Type (gnat_entity))))) |
| && UI_Is_In_Int_Range (Alignment (gnat_entity))) |
| { |
| align = UI_To_Int (Alignment (gnat_entity)) * BITS_PER_UNIT; |
| if (align >= TYPE_ALIGN (gnu_type)) |
| align = 0; |
| } |
| |
| /* If the type we are dealing with represents a bit-packed array, |
| we need to have the bits left justified on big-endian targets |
| and right justified on little-endian targets. We also need to |
| ensure that when the value is read (e.g. for comparison of two |
| such values), we only get the good bits, since the unused bits |
| are uninitialized. Both goals are accomplished by wrapping up |
| the modular type in an enclosing record type. */ |
| if (Is_Packed_Array_Impl_Type (gnat_entity) |
| && Is_Bit_Packed_Array (Original_Array_Type (gnat_entity))) |
| { |
| tree gnu_field_type, gnu_field; |
| |
| /* Set the RM size before wrapping up the original type. */ |
| SET_TYPE_RM_SIZE (gnu_type, |
| UI_To_gnu (RM_Size (gnat_entity), bitsizetype)); |
| TYPE_PACKED_ARRAY_TYPE_P (gnu_type) = 1; |
| |
| /* Create a stripped-down declaration, mainly for debugging. */ |
| create_type_decl (gnu_entity_name, gnu_type, true, debug_info_p, |
| gnat_entity); |
| |
| /* Now save it and build the enclosing record type. */ |
| gnu_field_type = gnu_type; |
| |
| gnu_type = make_node (RECORD_TYPE); |
| TYPE_NAME (gnu_type) = create_concat_name (gnat_entity, "JM"); |
| TYPE_PACKED (gnu_type) = 1; |
| TYPE_SIZE (gnu_type) = TYPE_SIZE (gnu_field_type); |
| TYPE_SIZE_UNIT (gnu_type) = TYPE_SIZE_UNIT (gnu_field_type); |
| SET_TYPE_ADA_SIZE (gnu_type, TYPE_RM_SIZE (gnu_field_type)); |
| |
| /* Propagate the alignment of the modular type to the record type, |
| unless there is an alignment clause that under-aligns the type. |
| This means that bit-packed arrays are given "ceil" alignment for |
| their size by default, which may seem counter-intuitive but makes |
| it possible to overlay them on modular types easily. */ |
| SET_TYPE_ALIGN (gnu_type, |
| align > 0 ? align : TYPE_ALIGN (gnu_field_type)); |
| |
| /* Propagate the reverse storage order flag to the record type so |
| that the required byte swapping is performed when retrieving the |
| enclosed modular value. */ |
| TYPE_REVERSE_STORAGE_ORDER (gnu_type) |
| = Reverse_Storage_Order (Original_Array_Type (gnat_entity)); |
| |
| relate_alias_sets (gnu_type, gnu_field_type, ALIAS_SET_COPY); |
| |
| /* Don't declare the field as addressable since we won't be taking |
| its address and this would prevent create_field_decl from making |
| a bitfield. */ |
| gnu_field |
| = create_field_decl (get_identifier ("OBJECT"), gnu_field_type, |
| gnu_type, NULL_TREE, bitsize_zero_node, 1, 0); |
| |
| /* We will output additional debug info manually below. */ |
| finish_record_type (gnu_type, gnu_field, 2, false); |
| TYPE_JUSTIFIED_MODULAR_P (gnu_type) = 1; |
| |
| if (debug_info_p) |
| { |
| /* Make the original array type a parallel/debug type. */ |
| associate_original_type_to_packed_array (gnu_type, gnat_entity); |
| |
| /* Since GNU_TYPE is a padding type around the packed array |
| implementation type, the padded type is its debug type. */ |
| if (gnat_encodings == DWARF_GNAT_ENCODINGS_MINIMAL) |
| SET_TYPE_DEBUG_TYPE (gnu_type, gnu_field_type); |
| } |
| } |
| |
| /* If the type we are dealing with has got a smaller alignment than the |
| natural one, we need to wrap it up in a record type and misalign the |
| latter; we reuse the padding machinery for this purpose. */ |
| else if (align > 0) |
| { |
| tree gnu_size = UI_To_gnu (RM_Size (gnat_entity), bitsizetype); |
| |
| /* Set the RM size before wrapping the type. */ |
| SET_TYPE_RM_SIZE (gnu_type, gnu_size); |
| |
| gnu_type |
| = maybe_pad_type (gnu_type, TYPE_SIZE (gnu_type), align, |
| gnat_entity, false, true, definition, false); |
| |
| TYPE_PACKED (gnu_type) = 1; |
| SET_TYPE_ADA_SIZE (gnu_type, gnu_size); |
| } |
| |
| break; |
| |
| case E_Floating_Point_Type: |
| /* The type of the Low and High bounds can be our type if this is |
| a type from Standard, so set them at the end of the function. */ |
| gnu_type = make_node (REAL_TYPE); |
| TYPE_PRECISION (gnu_type) = fp_size_to_prec (esize); |
| layout_type (gnu_type); |
| break; |
| |
| case E_Floating_Point_Subtype: |
| /* See the E_Signed_Integer_Subtype case for the rationale. */ |
| if (!definition |
| && Present (Ancestor_Subtype (gnat_entity)) |
| && !In_Extended_Main_Code_Unit (Ancestor_Subtype (gnat_entity)) |
| && (!Compile_Time_Known_Value (Type_Low_Bound (gnat_entity)) |
| || !Compile_Time_Known_Value (Type_High_Bound (gnat_entity)))) |
| gnat_to_gnu_entity (Ancestor_Subtype (gnat_entity), gnu_expr, false); |
| |
| gnu_type = make_node (REAL_TYPE); |
| TREE_TYPE (gnu_type) = get_unpadded_type (Etype (gnat_entity)); |
| TYPE_PRECISION (gnu_type) = fp_size_to_prec (esize); |
| TYPE_GCC_MIN_VALUE (gnu_type) |
| = TYPE_GCC_MIN_VALUE (TREE_TYPE (gnu_type)); |
| TYPE_GCC_MAX_VALUE (gnu_type) |
| = TYPE_GCC_MAX_VALUE (TREE_TYPE (gnu_type)); |
| layout_type (gnu_type); |
| |
| SET_TYPE_RM_MIN_VALUE |
| (gnu_type, elaborate_expression (Type_Low_Bound (gnat_entity), |
| gnat_entity, "L", definition, true, |
| debug_info_p)); |
| |
| SET_TYPE_RM_MAX_VALUE |
| (gnu_type, elaborate_expression (Type_High_Bound (gnat_entity), |
| gnat_entity, "U", definition, true, |
| debug_info_p)); |
| |
| /* Inherit our alias set from what we're a subtype of, as for |
| integer subtypes. */ |
| relate_alias_sets (gnu_type, TREE_TYPE (gnu_type), ALIAS_SET_COPY); |
| |
| /* One of the above calls might have caused us to be elaborated, |
| so don't blow up if so. */ |
| maybe_present = true; |
| break; |
| |
| /* Array Types and Subtypes |
| |
| Unconstrained array types are represented by E_Array_Type and |
| constrained array types are represented by E_Array_Subtype. There |
| are no actual objects of an unconstrained array type; all we have |
| are pointers to that type. |
| |
| The following fields are defined on array types and subtypes: |
| |
| Component_Type Component type of the array. |
| Number_Dimensions Number of dimensions (an int). |
| First_Index Type of first index. */ |
| |
| case E_Array_Type: |
| { |
| const bool convention_fortran_p |
| = (Convention (gnat_entity) == Convention_Fortran); |
| const int ndim = Number_Dimensions (gnat_entity); |
| tree gnu_template_type; |
| tree gnu_ptr_template; |
| tree gnu_template_reference, gnu_template_fields, gnu_fat_type; |
| tree *gnu_index_types = XALLOCAVEC (tree, ndim); |
| tree *gnu_temp_fields = XALLOCAVEC (tree, ndim); |
| tree gnu_max_size = size_one_node, gnu_max_size_unit, tem, t; |
| Entity_Id gnat_index, gnat_name; |
| int index; |
| tree comp_type; |
| |
| /* Create the type for the component now, as it simplifies breaking |
| type reference loops. */ |
| comp_type |
| = gnat_to_gnu_component_type (gnat_entity, definition, debug_info_p); |
| if (present_gnu_tree (gnat_entity)) |
| { |
| /* As a side effect, the type may have been translated. */ |
| maybe_present = true; |
| break; |
| } |
| |
| /* We complete an existing dummy fat pointer type in place. This both |
| avoids further complex adjustments in update_pointer_to and yields |
| better debugging information in DWARF by leveraging the support for |
| incomplete declarations of "tagged" types in the DWARF back-end. */ |
| gnu_type = get_dummy_type (gnat_entity); |
| if (gnu_type && TYPE_POINTER_TO (gnu_type)) |
| { |
| gnu_fat_type = TYPE_MAIN_VARIANT (TYPE_POINTER_TO (gnu_type)); |
| TYPE_NAME (gnu_fat_type) = NULL_TREE; |
| gnu_ptr_template = |
| TREE_TYPE (DECL_CHAIN (TYPE_FIELDS (gnu_fat_type))); |
| gnu_template_type = TREE_TYPE (gnu_ptr_template); |
| |
| /* Save the contents of the dummy type for update_pointer_to. */ |
| TYPE_POINTER_TO (gnu_type) = copy_type (gnu_fat_type); |
| TYPE_FIELDS (TYPE_POINTER_TO (gnu_type)) |
| = copy_node (TYPE_FIELDS (gnu_fat_type)); |
| DECL_CHAIN (TYPE_FIELDS (TYPE_POINTER_TO (gnu_type))) |
| = copy_node (DECL_CHAIN (TYPE_FIELDS (gnu_fat_type))); |
| } |
| else |
| { |
| gnu_fat_type = make_node (RECORD_TYPE); |
| gnu_template_type = make_node (RECORD_TYPE); |
| gnu_ptr_template = build_pointer_type (gnu_template_type); |
| } |
| |
| /* Make a node for the array. If we are not defining the array |
| suppress expanding incomplete types. */ |
| gnu_type = make_node (UNCONSTRAINED_ARRAY_TYPE); |
| |
| if (!definition) |
| { |
| defer_incomplete_level++; |
| this_deferred = true; |
| } |
| |
| /* Build the fat pointer type. Use a "void *" object instead of |
| a pointer to the array type since we don't have the array type |
| yet (it will reference the fat pointer via the bounds). Note |
| that we reuse the existing fields of a dummy type because for: |
| |
| type Arr is array (Positive range <>) of Element_Type; |
| type Array_Ref is access Arr; |
| Var : Array_Ref := Null; |
| |
| in a declarative part, Arr will be frozen only after Var, which |
| means that the fields used in the CONSTRUCTOR built for Null are |
| those of the dummy type, which in turn means that COMPONENT_REFs |
| of Var may be built with these fields. Now if COMPONENT_REFs of |
| Var are also built later with the fields of the final type, the |
| aliasing machinery may consider that the accesses are distinct |
| if the FIELD_DECLs are distinct as objects. */ |
| if (COMPLETE_TYPE_P (gnu_fat_type)) |
| { |
| tem = TYPE_FIELDS (gnu_fat_type); |
| TREE_TYPE (tem) = ptr_type_node; |
| TREE_TYPE (DECL_CHAIN (tem)) = gnu_ptr_template; |
| TYPE_DECL_SUPPRESS_DEBUG (TYPE_STUB_DECL (gnu_fat_type)) = 0; |
| for (t = gnu_fat_type; t; t = TYPE_NEXT_VARIANT (t)) |
| SET_TYPE_UNCONSTRAINED_ARRAY (t, gnu_type); |
| } |
| else |
| { |
| tem |
| = create_field_decl (get_identifier ("P_ARRAY"), |
| ptr_type_node, gnu_fat_type, |
| NULL_TREE, NULL_TREE, 0, 0); |
| DECL_CHAIN (tem) |
| = create_field_decl (get_identifier ("P_BOUNDS"), |
| gnu_ptr_template, gnu_fat_type, |
| NULL_TREE, NULL_TREE, 0, 0); |
| finish_fat_pointer_type (gnu_fat_type, tem); |
| SET_TYPE_UNCONSTRAINED_ARRAY (gnu_fat_type, gnu_type); |
| } |
| |
| /* Build a reference to the template from a PLACEHOLDER_EXPR that |
| is the fat pointer. This will be used to access the individual |
| fields once we build them. */ |
| tem = build3 (COMPONENT_REF, gnu_ptr_template, |
| build0 (PLACEHOLDER_EXPR, gnu_fat_type), |
| DECL_CHAIN (TYPE_FIELDS (gnu_fat_type)), NULL_TREE); |
| gnu_template_reference |
| = build_unary_op (INDIRECT_REF, gnu_template_type, tem); |
| TREE_READONLY (gnu_template_reference) = 1; |
| TREE_THIS_NOTRAP (gnu_template_reference) = 1; |
| |
| /* Now create the GCC type for each index and add the fields for that |
| index to the template. */ |
| for (index = (convention_fortran_p ? ndim - 1 : 0), |
| gnat_index = First_Index (gnat_entity); |
| IN_RANGE (index, 0, ndim - 1); |
| index += (convention_fortran_p ? - 1 : 1), |
| gnat_index = Next_Index (gnat_index)) |
| { |
| char field_name[16]; |
| tree gnu_index_type = get_unpadded_type (Etype (gnat_index)); |
| tree gnu_index_base_type |
| = maybe_character_type (get_base_type (gnu_index_type)); |
| tree gnu_lb_field, gnu_hb_field, gnu_orig_min, gnu_orig_max; |
| tree gnu_min, gnu_max, gnu_high; |
| |
| /* Make the FIELD_DECLs for the low and high bounds of this |
| type and then make extractions of these fields from the |
| template. */ |
| sprintf (field_name, "LB%d", index); |
| gnu_lb_field = create_field_decl (get_identifier (field_name), |
| gnu_index_base_type, |
| gnu_template_type, NULL_TREE, |
| NULL_TREE, 0, 0); |
| Sloc_to_locus (Sloc (gnat_entity), |
| &DECL_SOURCE_LOCATION (gnu_lb_field)); |
| |
| field_name[0] = 'U'; |
| gnu_hb_field = create_field_decl (get_identifier (field_name), |
| gnu_index_base_type, |
| gnu_template_type, NULL_TREE, |
| NULL_TREE, 0, 0); |
| Sloc_to_locus (Sloc (gnat_entity), |
| &DECL_SOURCE_LOCATION (gnu_hb_field)); |
| |
| gnu_temp_fields[index] = chainon (gnu_lb_field, gnu_hb_field); |
| |
| /* We can't use build_component_ref here since the template type |
| isn't complete yet. */ |
| gnu_orig_min = build3 (COMPONENT_REF, gnu_index_base_type, |
| gnu_template_reference, gnu_lb_field, |
| NULL_TREE); |
| gnu_orig_max = build3 (COMPONENT_REF, gnu_index_base_type, |
| gnu_template_reference, gnu_hb_field, |
| NULL_TREE); |
| TREE_READONLY (gnu_orig_min) = TREE_READONLY (gnu_orig_max) = 1; |
| |
| gnu_min = convert (sizetype, gnu_orig_min); |
| gnu_max = convert (sizetype, gnu_orig_max); |
| |
| /* Compute the size of this dimension. See the E_Array_Subtype |
| case below for the rationale. */ |
| gnu_high |
| = build3 (COND_EXPR, sizetype, |
| build2 (GE_EXPR, boolean_type_node, |
| gnu_orig_max, gnu_orig_min), |
| gnu_max, |
| size_binop (MINUS_EXPR, gnu_min, size_one_node)); |
| |
| /* Make a range type with the new range in the Ada base type. |
| Then make an index type with the size range in sizetype. */ |
| gnu_index_types[index] |
| = create_index_type (gnu_min, gnu_high, |
| create_range_type (gnu_index_base_type, |
| gnu_orig_min, |
| gnu_orig_max), |
| gnat_entity); |
| |
| /* Update the maximum size of the array in elements. */ |
| if (gnu_max_size) |
| { |
| tree gnu_min |
| = convert (sizetype, TYPE_MIN_VALUE (gnu_index_type)); |
| tree gnu_max |
| = convert (sizetype, TYPE_MAX_VALUE (gnu_index_type)); |
| tree gnu_this_max |
| = size_binop (PLUS_EXPR, size_one_node, |
| size_binop (MINUS_EXPR, gnu_max, gnu_min)); |
| |
| if (TREE_CODE (gnu_this_max) == INTEGER_CST |
| && TREE_OVERFLOW (gnu_this_max)) |
| gnu_max_size = NULL_TREE; |
| else |
| gnu_max_size |
| = size_binop (MULT_EXPR, gnu_max_size, gnu_this_max); |
| } |
| |
| TYPE_NAME (gnu_index_types[index]) |
| = create_concat_name (gnat_entity, field_name); |
| } |
| |
| /* Install all the fields into the template. */ |
| TYPE_NAME (gnu_template_type) |
| = create_concat_name (gnat_entity, "XUB"); |
| gnu_template_fields = NULL_TREE; |
| for (index = 0; index < ndim; index++) |
| gnu_template_fields |
| = chainon (gnu_template_fields, gnu_temp_fields[index]); |
| finish_record_type (gnu_template_type, gnu_template_fields, 0, |
| debug_info_p); |
| TYPE_READONLY (gnu_template_type) = 1; |
| |
| /* If Component_Size is not already specified, annotate it with the |
| size of the component. */ |
| if (Unknown_Component_Size (gnat_entity)) |
| Set_Component_Size (gnat_entity, |
| annotate_value (TYPE_SIZE (comp_type))); |
| |
| /* Compute the maximum size of the array in units and bits. */ |
| if (gnu_max_size) |
| { |
| gnu_max_size_unit = size_binop (MULT_EXPR, gnu_max_size, |
| TYPE_SIZE_UNIT (comp_type)); |
| gnu_max_size = size_binop (MULT_EXPR, |
| convert (bitsizetype, gnu_max_size), |
| TYPE_SIZE (comp_type)); |
| } |
| else |
| gnu_max_size_unit = NULL_TREE; |
| |
| /* Now build the array type. */ |
| tem = comp_type; |
| for (index = ndim - 1; index >= 0; index--) |
| { |
| tem = build_nonshared_array_type (tem, gnu_index_types[index]); |
| TYPE_MULTI_ARRAY_P (tem) = (index > 0); |
| TYPE_CONVENTION_FORTRAN_P (tem) = convention_fortran_p; |
| if (index == ndim - 1 && Reverse_Storage_Order (gnat_entity)) |
| set_reverse_storage_order_on_array_type (tem); |
| if (array_type_has_nonaliased_component (tem, gnat_entity)) |
| set_nonaliased_component_on_array_type (tem); |
| } |
| |
| /* If an alignment is specified, use it if valid. But ignore it |
| for the original type of packed array types. If the alignment |
| was requested with an explicit alignment clause, state so. */ |
| if (No (Packed_Array_Impl_Type (gnat_entity)) |
| && Known_Alignment (gnat_entity)) |
| { |
| SET_TYPE_ALIGN (tem, |
| validate_alignment (Alignment (gnat_entity), |
| gnat_entity, |
| TYPE_ALIGN (tem))); |
| if (Present (Alignment_Clause (gnat_entity))) |
| TYPE_USER_ALIGN (tem) = 1; |
| } |
| |
| /* Tag top-level ARRAY_TYPE nodes for packed arrays and their |
| implementation types as such so that the debug information back-end |
| can output the appropriate description for them. */ |
| TYPE_PACKED (tem) |
| = (Is_Packed (gnat_entity) |
| || Is_Packed_Array_Impl_Type (gnat_entity)); |
| |
| if (Treat_As_Volatile (gnat_entity)) |
| tem = change_qualified_type (tem, TYPE_QUAL_VOLATILE); |
| |
| /* Adjust the type of the pointer-to-array field of the fat pointer |
| and record the aliasing relationships if necessary. */ |
| TREE_TYPE (TYPE_FIELDS (gnu_fat_type)) = build_pointer_type (tem); |
| if (TYPE_ALIAS_SET_KNOWN_P (gnu_fat_type)) |
| record_component_aliases (gnu_fat_type); |
| |
| /* The result type is an UNCONSTRAINED_ARRAY_TYPE that indicates the |
| corresponding fat pointer. */ |
| TREE_TYPE (gnu_type) = gnu_fat_type; |
| TYPE_POINTER_TO (gnu_type) = gnu_fat_type; |
| TYPE_REFERENCE_TO (gnu_type) = gnu_fat_type; |
| SET_TYPE_MODE (gnu_type, BLKmode); |
| SET_TYPE_ALIGN (gnu_type, TYPE_ALIGN (tem)); |
| |
| /* If the maximum size doesn't overflow, use it. */ |
| if (gnu_max_size |
| && TREE_CODE (gnu_max_size) == INTEGER_CST |
| && !TREE_OVERFLOW (gnu_max_size) |
| && TREE_CODE (gnu_max_size_unit) == INTEGER_CST |
| && !TREE_OVERFLOW (gnu_max_size_unit)) |
| { |
| TYPE_SIZE (tem) = size_binop (MIN_EXPR, gnu_max_size, |
| TYPE_SIZE (tem)); |
| TYPE_SIZE_UNIT (tem) = size_binop (MIN_EXPR, gnu_max_size_unit, |
| TYPE_SIZE_UNIT (tem)); |
| } |
| |
| create_type_decl (create_concat_name (gnat_entity, "XUA"), tem, |
| artificial_p, debug_info_p, gnat_entity); |
| |
| /* If told to generate GNAT encodings for them (GDB rely on them at the |
| moment): give the fat pointer type a name. If this is a packed |
| array, tell the debugger how to interpret the underlying bits. */ |
| if (Present (Packed_Array_Impl_Type (gnat_entity))) |
| gnat_name = Packed_Array_Impl_Type (gnat_entity); |
| else |
| gnat_name = gnat_entity; |
| tree xup_name |
| = (gnat_encodings == DWARF_GNAT_ENCODINGS_MINIMAL) |
| ? get_entity_name (gnat_name) |
| : create_concat_name (gnat_name, "XUP"); |
| create_type_decl (xup_name, gnu_fat_type, artificial_p, debug_info_p, |
| gnat_entity); |
| |
| /* Create the type to be designated by thin pointers: a record type for |
| the array and its template. We used to shift the fields to have the |
| template at a negative offset, but this was somewhat of a kludge; we |
| now shift thin pointer values explicitly but only those which have a |
| TYPE_UNCONSTRAINED_ARRAY attached to the designated RECORD_TYPE. |
| Note that GDB can handle standard DWARF information for them, so we |
| don't have to name them as a GNAT encoding, except if specifically |
| asked to. */ |
| tree xut_name |
| = (gnat_encodings == DWARF_GNAT_ENCODINGS_MINIMAL) |
| ? get_entity_name (gnat_name) |
| : create_concat_name (gnat_name, "XUT"); |
| tem = build_unc_object_type (gnu_template_type, tem, xut_name, |
| debug_info_p); |
| |
| SET_TYPE_UNCONSTRAINED_ARRAY (tem, gnu_type); |
| TYPE_OBJECT_RECORD_TYPE (gnu_type) = tem; |
| } |
| break; |
| |
| case E_Array_Subtype: |
| |
| /* This is the actual data type for array variables. Multidimensional |
| arrays are implemented as arrays of arrays. Note that arrays which |
| have sparse enumeration subtypes as index components create sparse |
| arrays, which is obviously space inefficient but so much easier to |
| code for now. |
| |
| Also note that the subtype never refers to the unconstrained array |
| type, which is somewhat at variance with Ada semantics. |
| |
| First check to see if this is simply a renaming of the array type. |
| If so, the result is the array type. */ |
| |
| gnu_type = TYPE_MAIN_VARIANT (gnat_to_gnu_type (Etype (gnat_entity))); |
| if (!Is_Constrained (gnat_entity)) |
| ; |
| else |
| { |
| Entity_Id gnat_index, gnat_base_index; |
| const bool convention_fortran_p |
| = (Convention (gnat_entity) == Convention_Fortran); |
| const int ndim = Number_Dimensions (gnat_entity); |
| tree gnu_base_type = gnu_type; |
| tree *gnu_index_types = XALLOCAVEC (tree, ndim); |
| tree gnu_max_size = size_one_node, gnu_max_size_unit; |
| bool need_index_type_struct = false; |
| int index; |
| |
| /* First create the GCC type for each index and find out whether |
| special types are needed for debugging information. */ |
| for (index = (convention_fortran_p ? ndim - 1 : 0), |
| gnat_index = First_Index (gnat_entity), |
| gnat_base_index |
| = First_Index (Implementation_Base_Type (gnat_entity)); |
| IN_RANGE (index, 0, ndim - 1); |
| index += (convention_fortran_p ? - 1 : 1), |
| gnat_index = Next_Index (gnat_index), |
| gnat_base_index = Next_Index (gnat_base_index)) |
| { |
| tree gnu_index_type = get_unpadded_type (Etype (gnat_index)); |
| tree gnu_index_base_type |
| = maybe_character_type (get_base_type (gnu_index_type)); |
| tree gnu_orig_min |
| = convert (gnu_index_base_type, |
| TYPE_MIN_VALUE (gnu_index_type)); |
| tree gnu_orig_max |
| = convert (gnu_index_base_type, |
| TYPE_MAX_VALUE (gnu_index_type)); |
| tree gnu_min = convert (sizetype, gnu_orig_min); |
| tree gnu_max = convert (sizetype, gnu_orig_max); |
| tree gnu_base_index_type |
| = get_unpadded_type (Etype (gnat_base_index)); |
| tree gnu_base_index_base_type |
| = maybe_character_type (get_base_type (gnu_base_index_type)); |
| tree gnu_base_orig_min |
| = convert (gnu_base_index_base_type, |
| TYPE_MIN_VALUE (gnu_base_index_type)); |
| tree gnu_base_orig_max |
| = convert (gnu_base_index_base_type, |
| TYPE_MAX_VALUE (gnu_base_index_type)); |
| tree gnu_high; |
| |
| /* See if the base array type is already flat. If it is, we |
| are probably compiling an ACATS test but it will cause the |
| code below to malfunction if we don't handle it specially. */ |
| if (TREE_CODE (gnu_base_orig_min) == INTEGER_CST |
| && TREE_CODE (gnu_base_orig_max) == INTEGER_CST |
| && tree_int_cst_lt (gnu_base_orig_max, gnu_base_orig_min)) |
| { |
| gnu_min = size_one_node; |
| gnu_max = size_zero_node; |
| gnu_high = gnu_max; |
| } |
| |
| /* Similarly, if one of the values overflows in sizetype and the |
| range is null, use 1..0 for the sizetype bounds. */ |
| else if (TREE_CODE (gnu_min) == INTEGER_CST |
| && TREE_CODE (gnu_max) == INTEGER_CST |
| && (TREE_OVERFLOW (gnu_min) || TREE_OVERFLOW (gnu_max)) |
| && tree_int_cst_lt (gnu_orig_max, gnu_orig_min)) |
| { |
| gnu_min = size_one_node; |
| gnu_max = size_zero_node; |
| gnu_high = gnu_max; |
| } |
| |
| /* If the minimum and maximum values both overflow in sizetype, |
| but the difference in the original type does not overflow in |
| sizetype, ignore the overflow indication. */ |
| else if (TREE_CODE (gnu_min) == INTEGER_CST |
| && TREE_CODE (gnu_max) == INTEGER_CST |
| && TREE_OVERFLOW (gnu_min) && TREE_OVERFLOW (gnu_max) |
| && !TREE_OVERFLOW |
| (convert (sizetype, |
| fold_build2 (MINUS_EXPR, gnu_index_type, |
| gnu_orig_max, |
| gnu_orig_min)))) |
| { |
| TREE_OVERFLOW (gnu_min) = 0; |
| TREE_OVERFLOW (gnu_max) = 0; |
| gnu_high = gnu_max; |
| } |
| |
| /* Compute the size of this dimension in the general case. We |
| need to provide GCC with an upper bound to use but have to |
| deal with the "superflat" case. There are three ways to do |
| this. If we can prove that the array can never be superflat, |
| we can just use the high bound of the index type. */ |
| else if ((Nkind (gnat_index) == N_Range |
| && cannot_be_superflat (gnat_index)) |
| /* Bit-Packed Array Impl. Types are never superflat. */ |
| || (Is_Packed_Array_Impl_Type (gnat_entity) |
| && Is_Bit_Packed_Array |
| (Original_Array_Type (gnat_entity)))) |
| gnu_high = gnu_max; |
| |
| /* Otherwise, if the high bound is constant but the low bound is |
| not, we use the expression (hb >= lb) ? lb : hb + 1 for the |
| lower bound. Note that the comparison must be done in the |
| original type to avoid any overflow during the conversion. */ |
| else if (TREE_CODE (gnu_max) == INTEGER_CST |
| && TREE_CODE (gnu_min) != INTEGER_CST) |
| { |
| gnu_high = gnu_max; |
| gnu_min |
| = build_cond_expr (sizetype, |
| build_binary_op (GE_EXPR, |
| boolean_type_node, |
| gnu_orig_max, |
| gnu_orig_min), |
| gnu_min, |
| int_const_binop (PLUS_EXPR, gnu_max, |
| size_one_node)); |
| } |
| |
| /* Finally we use (hb >= lb) ? hb : lb - 1 for the upper bound |
| in all the other cases. Note that, here as well as above, |
| the condition used in the comparison must be equivalent to |
| the condition (length != 0). This is relied upon in order |
| to optimize array comparisons in compare_arrays. Moreover |
| we use int_const_binop for the shift by 1 if the bound is |
| constant to avoid any unwanted overflow. */ |
| else |
| gnu_high |
| = build_cond_expr (sizetype, |
| build_binary_op (GE_EXPR, |
| boolean_type_node, |
| gnu_orig_max, |
| gnu_orig_min), |
| gnu_max, |
| TREE_CODE (gnu_min) == INTEGER_CST |
| ? int_const_binop (MINUS_EXPR, gnu_min, |
| size_one_node) |
| : size_binop (MINUS_EXPR, gnu_min, |
| size_one_node)); |
| |
| /* Reuse the index type for the range type. Then make an index |
| type with the size range in sizetype. */ |
| gnu_index_types[index] |
| = create_index_type (gnu_min, gnu_high, gnu_index_type, |
| gnat_entity); |
| |
| /* Update the maximum size of the array in elements. Here we |
| see if any constraint on the index type of the base type |
| can be used in the case of self-referential bound on the |
| index type of the subtype. We look for a non-"infinite" |
| and non-self-referential bound from any type involved and |
| handle each bound separately. */ |
| if (gnu_max_size) |
| { |
| tree gnu_base_min = convert (sizetype, gnu_base_orig_min); |
| tree gnu_base_max = convert (sizetype, gnu_base_orig_max); |
| tree gnu_base_base_min |
| = convert (sizetype, |
| TYPE_MIN_VALUE (gnu_base_index_base_type)); |
| tree gnu_base_base_max |
| = convert (sizetype, |
| TYPE_MAX_VALUE (gnu_base_index_base_type)); |
| |
| if (!CONTAINS_PLACEHOLDER_P (gnu_min) |
| || !(TREE_CODE (gnu_base_min) == INTEGER_CST |
| && !TREE_OVERFLOW (gnu_base_min))) |
| gnu_base_min = gnu_min; |
| |
| if (!CONTAINS_PLACEHOLDER_P (gnu_max) |
| || !(TREE_CODE (gnu_base_max) == INTEGER_CST |
| && !TREE_OVERFLOW (gnu_base_max))) |
| gnu_base_max = gnu_max; |
| |
| if ((TREE_CODE (gnu_base_min) == INTEGER_CST |
| && TREE_OVERFLOW (gnu_base_min)) |
| || operand_equal_p (gnu_base_min, gnu_base_base_min, 0) |
| || (TREE_CODE (gnu_base_max) == INTEGER_CST |
| && TREE_OVERFLOW (gnu_base_max)) |
| || operand_equal_p (gnu_base_max, gnu_base_base_max, 0)) |
| gnu_max_size = NULL_TREE; |
| else |
| { |
| tree gnu_this_max; |
| |
| /* Use int_const_binop if the bounds are constant to |
| avoid any unwanted overflow. */ |
| if (TREE_CODE (gnu_base_min) == INTEGER_CST |
| && TREE_CODE (gnu_base_max) == INTEGER_CST) |
| gnu_this_max |
| = int_const_binop (PLUS_EXPR, size_one_node, |
| int_const_binop (MINUS_EXPR, |
| gnu_base_max, |
| gnu_base_min)); |
| else |
| gnu_this_max |
| = size_binop (PLUS_EXPR, size_one_node, |
| size_binop (MINUS_EXPR, |
| gnu_base_max, |
| gnu_base_min)); |
| |
| gnu_max_size |
| = size_binop (MULT_EXPR, gnu_max_size, gnu_this_max); |
| } |
| } |
| |
| /* We need special types for debugging information to point to |
| the index types if they have variable bounds, are not integer |
| types, are biased or are wider than sizetype. These are GNAT |
| encodings, so we have to include them only when all encodings |
| are requested. */ |
| if ((TREE_CODE (gnu_orig_min) != INTEGER_CST |
| || TREE_CODE (gnu_orig_max) != INTEGER_CST |
| || TREE_CODE (gnu_index_type) != INTEGER_TYPE |
| || (TREE_TYPE (gnu_index_type) |
| && TREE_CODE (TREE_TYPE (gnu_index_type)) |
| != INTEGER_TYPE) |
| || TYPE_BIASED_REPRESENTATION_P (gnu_index_type)) |
| && gnat_encodings != DWARF_GNAT_ENCODINGS_MINIMAL) |
| need_index_type_struct = true; |
| } |
| |
| /* Then flatten: create the array of arrays. For an array type |
| used to implement a packed array, get the component type from |
| the original array type since the representation clauses that |
| can affect it are on the latter. */ |
| if (Is_Packed_Array_Impl_Type (gnat_entity) |
| && !Is_Bit_Packed_Array (Original_Array_Type (gnat_entity))) |
| { |
| gnu_type = gnat_to_gnu_type (Original_Array_Type (gnat_entity)); |
| for (index = ndim - 1; index >= 0; index--) |
| gnu_type = TREE_TYPE (gnu_type); |
| |
| /* One of the above calls might have caused us to be elaborated, |
| so don't blow up if so. */ |
| if (present_gnu_tree (gnat_entity)) |
| { |
| maybe_present = true; |
| break; |
| } |
| } |
| else |
| { |
| gnu_type = gnat_to_gnu_component_type (gnat_entity, definition, |
| debug_info_p); |
| |
| /* One of the above calls might have caused us to be elaborated, |
| so don't blow up if so. */ |
| if (present_gnu_tree (gnat_entity)) |
| { |
| maybe_present = true; |
| break; |
| } |
| } |
| |
| /* Compute the maximum size of the array in units and bits. */ |
| if (gnu_max_size) |
| { |
| gnu_max_size_unit = size_binop (MULT_EXPR, gnu_max_size, |
| TYPE_SIZE_UNIT (gnu_type)); |
| gnu_max_size = size_binop (MULT_EXPR, |
| convert (bitsizetype, gnu_max_size), |
| TYPE_SIZE (gnu_type)); |
| } |
| else |
| gnu_max_size_unit = NULL_TREE; |
| |
| /* Now build the array type. */ |
| for (index = ndim - 1; index >= 0; index --) |
| { |
| gnu_type = build_nonshared_array_type (gnu_type, |
| gnu_index_types[index]); |
| TYPE_MULTI_ARRAY_P (gnu_type) = (index > 0); |
| TYPE_CONVENTION_FORTRAN_P (gnu_type) = convention_fortran_p; |
| if (index == ndim - 1 && Reverse_Storage_Order (gnat_entity)) |
| set_reverse_storage_order_on_array_type (gnu_type); |
| if (array_type_has_nonaliased_component (gnu_type, gnat_entity)) |
| set_nonaliased_component_on_array_type (gnu_type); |
| } |
| |
| /* Attach the TYPE_STUB_DECL in case we have a parallel type. */ |
| TYPE_STUB_DECL (gnu_type) |
| = create_type_stub_decl (gnu_entity_name, gnu_type); |
| |
| /* If this is a multi-dimensional array and we are at global level, |
| we need to make a variable corresponding to the stride of the |
| inner dimensions. */ |
| if (ndim > 1 && global_bindings_p ()) |
| { |
| tree gnu_arr_type; |
| |
| for (gnu_arr_type = TREE_TYPE (gnu_type), index = 1; |
| TREE_CODE (gnu_arr_type) == ARRAY_TYPE; |
| gnu_arr_type = TREE_TYPE (gnu_arr_type), index++) |
| { |
| tree eltype = TREE_TYPE (gnu_arr_type); |
| char stride_name[32]; |
| |
| sprintf (stride_name, "ST%d", index); |
| TYPE_SIZE (gnu_arr_type) |
| = elaborate_expression_1 (TYPE_SIZE (gnu_arr_type), |
| gnat_entity, stride_name, |
| definition, false); |
| |
| /* ??? For now, store the size as a multiple of the |
| alignment of the element type in bytes so that we |
| can see the alignment from the tree. */ |
| sprintf (stride_name, "ST%d_A_UNIT", index); |
| TYPE_SIZE_UNIT (gnu_arr_type) |
| = elaborate_expression_2 (TYPE_SIZE_UNIT (gnu_arr_type), |
| gnat_entity, stride_name, |
| definition, false, |
| TYPE_ALIGN (eltype)); |
| |
| /* ??? create_type_decl is not invoked on the inner types so |
| the MULT_EXPR node built above will never be marked. */ |
| MARK_VISITED (TYPE_SIZE_UNIT (gnu_arr_type)); |
| } |
| } |
| |
| /* If we need to write out a record type giving the names of the |
| bounds for debugging purposes, do it now and make the record |
| type a parallel type. This is not needed for a packed array |
| since the bounds are conveyed by the original array type. */ |
| if (need_index_type_struct |
| && debug_info_p |
| && !Is_Packed_Array_Impl_Type (gnat_entity)) |
| { |
| tree gnu_bound_rec = make_node (RECORD_TYPE); |
| tree gnu_field_list = NULL_TREE; |
| tree gnu_field; |
| |
| TYPE_NAME (gnu_bound_rec) |
| = create_concat_name (gnat_entity, "XA"); |
| |
| for (index = ndim - 1; index >= 0; index--) |
| { |
| tree gnu_index = TYPE_INDEX_TYPE (gnu_index_types[index]); |
| tree gnu_index_name = TYPE_IDENTIFIER (gnu_index); |
| |
| /* Make sure to reference the types themselves, and not just |
| their names, as the debugger may fall back on them. */ |
| gnu_field = create_field_decl (gnu_index_name, gnu_index, |
| gnu_bound_rec, NULL_TREE, |
| NULL_TREE, 0, 0); |
| DECL_CHAIN (gnu_field) = gnu_field_list; |
| gnu_field_list = gnu_field; |
| } |
| |
| finish_record_type (gnu_bound_rec, gnu_field_list, 0, true); |
| add_parallel_type (gnu_type, gnu_bound_rec); |
| } |
| |
| /* If this is a packed array type, make the original array type a |
| parallel/debug type. Otherwise, if such GNAT encodings are |
| required, do it for the base array type if it isn't artificial to |
| make sure it is kept in the debug info. */ |
| if (debug_info_p) |
| { |
| if (Is_Packed_Array_Impl_Type (gnat_entity)) |
| associate_original_type_to_packed_array (gnu_type, |
| gnat_entity); |
| else |
| { |
| tree gnu_base_decl |
| = gnat_to_gnu_entity (Etype (gnat_entity), NULL_TREE, |
| false); |
| if (!DECL_ARTIFICIAL (gnu_base_decl) |
| && gnat_encodings != DWARF_GNAT_ENCODINGS_MINIMAL) |
| add_parallel_type (gnu_type, |
| TREE_TYPE (TREE_TYPE (gnu_base_decl))); |
| } |
| } |
| |
| TYPE_PACKED_ARRAY_TYPE_P (gnu_type) |
| = (Is_Packed_Array_Impl_Type (gnat_entity) |
| && Is_Bit_Packed_Array (Original_Array_Type (gnat_entity))); |
| |
| /* Tag top-level ARRAY_TYPE nodes for packed arrays and their |
| implementation types as such so that the debug information back-end |
| can output the appropriate description for them. */ |
| TYPE_PACKED (gnu_type) |
| = (Is_Packed (gnat_entity) |
| || Is_Packed_Array_Impl_Type (gnat_entity)); |
| |
| /* If the size is self-referential and the maximum size doesn't |
| overflow, use it. */ |
| if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type)) |
| && gnu_max_size |
| && !(TREE_CODE (gnu_max_size) == INTEGER_CST |
| && TREE_OVERFLOW (gnu_max_size)) |
| && !(TREE_CODE (gnu_max_size_unit) == INTEGER_CST |
| && TREE_OVERFLOW (gnu_max_size_unit))) |
| { |
| TYPE_SIZE (gnu_type) = size_binop (MIN_EXPR, gnu_max_size, |
| TYPE_SIZE (gnu_type)); |
| TYPE_SIZE_UNIT (gnu_type) |
| = size_binop (MIN_EXPR, gnu_max_size_unit, |
| TYPE_SIZE_UNIT (gnu_type)); |
| } |
| |
| /* Set our alias set to that of our base type. This gives all |
| array subtypes the same alias set. */ |
| relate_alias_sets (gnu_type, gnu_base_type, ALIAS_SET_COPY); |
| |
| /* If this is a packed type implemented specially, then replace our |
| type with the implementation type. */ |
| if (Present (Packed_Array_Impl_Type (gnat_entity))) |
| { |
| /* First finish the type we had been making so that we output |
| debugging information for it. */ |
| process_attributes (&gnu_type, &attr_list, false, gnat_entity); |
| if (Treat_As_Volatile (gnat_entity)) |
| { |
| const int quals |
| = TYPE_QUAL_VOLATILE |
| | (Is_Atomic_Or_VFA (gnat_entity) ? TYPE_QUAL_ATOMIC : 0); |
| gnu_type = change_qualified_type (gnu_type, quals); |
| } |
| /* Make it artificial only if the base type was artificial too. |
| That's sort of "morally" true and will make it possible for |
| the debugger to look it up by name in DWARF, which is needed |
| in order to decode the packed array type. */ |
| tree gnu_tmp_decl |
| = create_type_decl (gnu_entity_name, gnu_type, |
| !Comes_From_Source (Etype (gnat_entity)) |
| && artificial_p, debug_info_p, |
| gnat_entity); |
| /* Save it as our equivalent in case the call below elaborates |
| this type again. */ |
| save_gnu_tree (gnat_entity, gnu_tmp_decl, false); |
| |
| gnu_type |
| = gnat_to_gnu_type (Packed_Array_Impl_Type (gnat_entity)); |
| save_gnu_tree (gnat_entity, NULL_TREE, false); |
| |
| /* Set the ___XP suffix for GNAT encodings. */ |
| if (gnat_encodings != DWARF_GNAT_ENCODINGS_MINIMAL) |
| gnu_entity_name = DECL_NAME (TYPE_NAME (gnu_type)); |
| |
| tree gnu_inner = gnu_type; |
| while (TREE_CODE (gnu_inner) == RECORD_TYPE |
| && (TYPE_JUSTIFIED_MODULAR_P (gnu_inner) |
| || TYPE_PADDING_P (gnu_inner))) |
| gnu_inner = TREE_TYPE (TYPE_FIELDS (gnu_inner)); |
| |
| /* We need to attach the index type to the type we just made so |
| that the actual bounds can later be put into a template. */ |
| if ((TREE_CODE (gnu_inner) == ARRAY_TYPE |
| && !TYPE_ACTUAL_BOUNDS (gnu_inner)) |
| || (TREE_CODE (gnu_inner) == INTEGER_TYPE |
| && !TYPE_HAS_ACTUAL_BOUNDS_P (gnu_inner))) |
| { |
| if (TREE_CODE (gnu_inner) == INTEGER_TYPE) |
| { |
| /* The TYPE_ACTUAL_BOUNDS field is overloaded with the |
| TYPE_MODULUS for modular types so we make an extra |
| subtype if necessary. */ |
| if (TYPE_MODULAR_P (gnu_inner)) |
| { |
| tree gnu_subtype |
| = make_unsigned_type (TYPE_PRECISION (gnu_inner)); |
| TREE_TYPE (gnu_subtype) = gnu_inner; |
| TYPE_EXTRA_SUBTYPE_P (gnu_subtype) = 1; |
| SET_TYPE_RM_MIN_VALUE (gnu_subtype, |
| TYPE_MIN_VALUE (gnu_inner)); |
| SET_TYPE_RM_MAX_VALUE (gnu_subtype, |
| TYPE_MAX_VALUE (gnu_inner)); |
| gnu_inner = gnu_subtype; |
| } |
| |
| TYPE_HAS_ACTUAL_BOUNDS_P (gnu_inner) = 1; |
| |
| /* Check for other cases of overloading. */ |
| gcc_checking_assert (!TYPE_ACTUAL_BOUNDS (gnu_inner)); |
| } |
| |
| for (Entity_Id gnat_index = First_Index (gnat_entity); |
| Present (gnat_index); |
| gnat_index = Next_Index (gnat_index)) |
| SET_TYPE_ACTUAL_BOUNDS |
| (gnu_inner, |
| tree_cons (NULL_TREE, |
| get_unpadded_type (Etype (gnat_index)), |
| TYPE_ACTUAL_BOUNDS (gnu_inner))); |
| |
| if (Convention (gnat_entity) != Convention_Fortran) |
| SET_TYPE_ACTUAL_BOUNDS |
| (gnu_inner, nreverse (TYPE_ACTUAL_BOUNDS (gnu_inner))); |
| |
| if (TREE_CODE (gnu_type) == RECORD_TYPE |
| && TYPE_JUSTIFIED_MODULAR_P (gnu_type)) |
| TREE_TYPE (TYPE_FIELDS (gnu_type)) = gnu_inner; |
| } |
| } |
| } |
| break; |
| |
| case E_String_Literal_Subtype: |
| /* Create the type for a string literal. */ |
| { |
| Entity_Id gnat_full_type |
| = (Is_Private_Type (Etype (gnat_entity)) |
| && Present (Full_View (Etype (gnat_entity))) |
| ? Full_View (Etype (gnat_entity)) : Etype (gnat_entity)); |
| tree gnu_string_type = get_unpadded_type (gnat_full_type); |
| tree gnu_string_array_type |
| = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_string_type)))); |
| tree gnu_string_index_type |
| = get_base_type (TREE_TYPE (TYPE_INDEX_TYPE |
| (TYPE_DOMAIN (gnu_string_array_type)))); |
| tree gnu_lower_bound |
| = convert (gnu_string_index_type, |
| gnat_to_gnu (String_Literal_Low_Bound (gnat_entity))); |
| tree gnu_length |
| = UI_To_gnu (String_Literal_Length (gnat_entity), |
| gnu_string_index_type); |
| tree gnu_upper_bound |
| = build_binary_op (PLUS_EXPR, gnu_string_index_type, |
| gnu_lower_bound, |
| int_const_binop (MINUS_EXPR, gnu_length, |
| convert (gnu_string_index_type, |
| integer_one_node))); |
| tree gnu_index_type |
| = create_index_type (convert (sizetype, gnu_lower_bound), |
| convert (sizetype, gnu_upper_bound), |
| create_range_type (gnu_string_index_type, |
| gnu_lower_bound, |
| gnu_upper_bound), |
| gnat_entity); |
| |
| gnu_type |
| = build_nonshared_array_type (gnat_to_gnu_type |
| (Component_Type (gnat_entity)), |
| gnu_index_type); |
| if (array_type_has_nonaliased_component (gnu_type, gnat_entity)) |
| set_nonaliased_component_on_array_type (gnu_type); |
| relate_alias_sets (gnu_type, gnu_string_type, ALIAS_SET_COPY); |
| } |
| break; |
| |
| /* Record Types and Subtypes |
| |
| The following fields are defined on record types: |
| |
| Has_Discriminants True if the record has discriminants |
| First_Discriminant Points to head of list of discriminants |
| First_Entity Points to head of list of fields |
| Is_Tagged_Type True if the record is tagged |
| |
| Implementation of Ada records and discriminated records: |
| |
| A record type definition is transformed into the equivalent of a C |
| struct definition. The fields that are the discriminants which are |
| found in the Full_Type_Declaration node and the elements of the |
| Component_List found in the Record_Type_Definition node. The |
| Component_List can be a recursive structure since each Variant of |
| the Variant_Part of the Component_List has a Component_List. |
| |
| Processing of a record type definition comprises starting the list of |
| field declarations here from the discriminants and the calling the |
| function components_to_record to add the rest of the fields from the |
| component list and return the gnu type node. The function |
| components_to_record will call itself recursively as it traverses |
| the tree. */ |
| |
| case E_Record_Type: |
| { |
| Node_Id record_definition = Type_Definition (gnat_decl); |
| |
| if (Has_Complex_Representation (gnat_entity)) |
| { |
| const Node_Id first_component |
| = First (Component_Items (Component_List (record_definition))); |
| tree gnu_component_type |
| = get_unpadded_type (Etype (Defining_Entity (first_component))); |
| gnu_type = build_complex_type (gnu_component_type); |
| break; |
| } |
| |
| Node_Id gnat_constr; |
| Entity_Id gnat_field, gnat_parent_type; |
| tree gnu_field, gnu_field_list = NULL_TREE; |
| tree gnu_get_parent; |
| /* Set PACKED in keeping with gnat_to_gnu_field. */ |
| const int packed |
| = Is_Packed (gnat_entity) |
| ? 1 |
| : Component_Alignment (gnat_entity) == Calign_Storage_Unit |
| ? -1 |
| : 0; |
| const bool has_align = Known_Alignment (gnat_entity); |
| const bool has_discr = Has_Discriminants (gnat_entity); |
| const bool has_rep = Has_Specified_Layout (gnat_entity); |
| const bool is_extension |
| = (Is_Tagged_Type (gnat_entity) |
| && Nkind (record_definition) == N_Derived_Type_Definition); |
| const bool is_unchecked_union = Is_Unchecked_Union (gnat_entity); |
| bool all_rep = has_rep; |
| |
| /* See if all fields have a rep clause. Stop when we find one |
| that doesn't. */ |
| if (all_rep) |
| for (gnat_field = First_Entity (gnat_entity); |
| Present (gnat_field); |
| gnat_field = Next_Entity (gnat_field)) |
| if ((Ekind (gnat_field) == E_Component |
| || Ekind (gnat_field) == E_Discriminant) |
| && No (Component_Clause (gnat_field))) |
| { |
| all_rep = false; |
| break; |
| } |
| |
| /* If this is a record extension, go a level further to find the |
| record definition. Also, verify we have a Parent_Subtype. */ |
| if (is_extension) |
| { |
| if (!type_annotate_only |
| || Present (Record_Extension_Part (record_definition))) |
| record_definition = Record_Extension_Part (record_definition); |
| |
| gcc_assert (type_annotate_only |
| || Present (Parent_Subtype (gnat_entity))); |
| } |
| |
| /* Make a node for the record. If we are not defining the record, |
| suppress expanding incomplete types. */ |
| gnu_type = make_node (tree_code_for_record_type (gnat_entity)); |
| TYPE_NAME (gnu_type) = gnu_entity_name; |
| TYPE_PACKED (gnu_type) = (packed != 0) || has_align || has_rep; |
| TYPE_REVERSE_STORAGE_ORDER (gnu_type) |
| = Reverse_Storage_Order (gnat_entity); |
| process_attributes (&gnu_type, &attr_list, true, gnat_entity); |
| |
| if (!definition) |
| { |
| defer_incomplete_level++; |
| this_deferred = true; |
| } |
| |
| /* If both a size and rep clause were specified, put the size on |
| the record type now so that it can get the proper layout. */ |
| if (has_rep && Known_RM_Size (gnat_entity)) |
| TYPE_SIZE (gnu_type) |
| = UI_To_gnu (RM_Size (gnat_entity), bitsizetype); |
| |
| /* Always set the alignment on the record type here so that it can |
| get the proper layout. */ |
| if (has_align) |
| SET_TYPE_ALIGN (gnu_type, |
| validate_alignment (Alignment (gnat_entity), |
| gnat_entity, 0)); |
| else |
| { |
| SET_TYPE_ALIGN (gnu_type, 0); |
| |
| /* If a type needs strict alignment, the minimum size will be the |
| type size instead of the RM size (see validate_size). Cap the |
| alignment lest it causes this type size to become too large. */ |
| if (Strict_Alignment (gnat_entity) && Known_RM_Size (gnat_entity)) |
| { |
| unsigned int max_size = UI_To_Int (RM_Size (gnat_entity)); |
| unsigned int max_align = max_size & -max_size; |
| if (max_align < BIGGEST_ALIGNMENT) |
| TYPE_MAX_ALIGN (gnu_type) = max_align; |
| } |
| } |
| |
| /* If we have a Parent_Subtype, make a field for the parent. If |
| this record has rep clauses, force the position to zero. */ |
| if (Present (Parent_Subtype (gnat_entity))) |
| { |
| Entity_Id gnat_parent = Parent_Subtype (gnat_entity); |
| tree gnu_dummy_parent_type = make_node (RECORD_TYPE); |
| tree gnu_parent; |
| int parent_packed = 0; |
| |
| /* A major complexity here is that the parent subtype will |
| reference our discriminants in its Stored_Constraint list. |
| But those must reference the parent component of this record |
| which is precisely of the parent subtype we have not built yet! |
| To break the circle we first build a dummy COMPONENT_REF which |
| represents the "get to the parent" operation and initialize |
| each of those discriminants to a COMPONENT_REF of the above |
| dummy parent referencing the corresponding discriminant of the |
| base type of the parent subtype. */ |
| gnu_get_parent = build3 (COMPONENT_REF, gnu_dummy_parent_type, |
| build0 (PLACEHOLDER_EXPR, gnu_type), |
| build_decl (input_location, |
| FIELD_DECL, NULL_TREE, |
| gnu_dummy_parent_type), |
| NULL_TREE); |
| |
| if (has_discr) |
| for (gnat_field = First_Stored_Discriminant (gnat_entity); |
| Present (gnat_field); |
| gnat_field = Next_Stored_Discriminant (gnat_field)) |
| if (Present (Corresponding_Discriminant (gnat_field))) |
| { |
| tree gnu_field |
| = gnat_to_gnu_field_decl (Corresponding_Discriminant |
| (gnat_field)); |
| save_gnu_tree |
| (gnat_field, |
| build3 (COMPONENT_REF, TREE_TYPE (gnu_field), |
| gnu_get_parent, gnu_field, NULL_TREE), |
| true); |
| } |
| |
| /* Then we build the parent subtype. If it has discriminants but |
| the type itself has unknown discriminants, this means that it |
| doesn't contain information about how the discriminants are |
| derived from those of the ancestor type, so it cannot be used |
| directly. Instead it is built by cloning the parent subtype |
| of the underlying record view of the type, for which the above |
| derivation of discriminants has been made explicit. */ |
| if (Has_Discriminants (gnat_parent) |
| && Has_Unknown_Discriminants (gnat_entity)) |
| { |
| Entity_Id gnat_uview = Underlying_Record_View (gnat_entity); |
| |
| /* If we are defining the type, the underlying record |
| view must already have been elaborated at this point. |
| Otherwise do it now as its parent subtype cannot be |
| technically elaborated on its own. */ |
| if (definition) |
| gcc_assert (present_gnu_tree (gnat_uview)); |
| else |
| gnat_to_gnu_entity (gnat_uview, NULL_TREE, false); |
| |
| gnu_parent = gnat_to_gnu_type (Parent_Subtype (gnat_uview)); |
| |
| /* Substitute the "get to the parent" of the type for that |
| of its underlying record view in the cloned type. */ |
| for (gnat_field = First_Stored_Discriminant (gnat_uview); |
| Present (gnat_field); |
| gnat_field = Next_Stored_Discriminant (gnat_field)) |
| if (Present (Corresponding_Discriminant (gnat_field))) |
| { |
| tree gnu_field = gnat_to_gnu_field_decl (gnat_field); |
| tree gnu_ref |
| = build3 (COMPONENT_REF, TREE_TYPE (gnu_field), |
| gnu_get_parent, gnu_field, NULL_TREE); |
| gnu_parent |
| = substitute_in_type (gnu_parent, gnu_field, gnu_ref); |
| } |
| } |
| else |
| gnu_parent = gnat_to_gnu_type (gnat_parent); |
| |
| /* The parent field needs strict alignment so, if it is to |
| be created with a component clause below, then we need |
| to apply the same adjustment as in gnat_to_gnu_field. */ |
| if (has_rep && TYPE_ALIGN (gnu_type) < TYPE_ALIGN (gnu_parent)) |
| { |
| /* ??? For historical reasons, we do it on strict-alignment |
| platforms only, where it is really required. This means |
| that a confirming representation clause will change the |
| behavior of the compiler on the other platforms. */ |
| if (STRICT_ALIGNMENT) |
| SET_TYPE_ALIGN (gnu_type, TYPE_ALIGN (gnu_parent)); |
| else |
| parent_packed |
| = adjust_packed (gnu_parent, gnu_type, parent_packed); |
| } |
| |
| /* Finally we fix up both kinds of twisted COMPONENT_REF we have |
| initially built. The discriminants must reference the fields |
| of the parent subtype and not those of its base type for the |
| placeholder machinery to properly work. */ |
| if (has_discr) |
| { |
| /* The actual parent subtype is the full view. */ |
| if (Is_Private_Type (gnat_parent)) |
| { |
| if (Present (Full_View (gnat_parent))) |
| gnat_parent = Full_View (gnat_parent); |
| else |
| gnat_parent = Underlying_Full_View (gnat_parent); |
| } |
| |
| for (gnat_field = First_Stored_Discriminant (gnat_entity); |
| Present (gnat_field); |
| gnat_field = Next_Stored_Discriminant (gnat_field)) |
| if (Present (Corresponding_Discriminant (gnat_field))) |
| { |
| Entity_Id field; |
| for (field = First_Stored_Discriminant (gnat_parent); |
| Present (field); |
| field = Next_Stored_Discriminant (field)) |
| if (same_discriminant_p (gnat_field, field)) |
| break; |
| gcc_assert (Present (field)); |
| TREE_OPERAND (get_gnu_tree (gnat_field), 1) |
| = gnat_to_gnu_field_decl (field); |
| } |
| } |
| |
| /* The "get to the parent" COMPONENT_REF must be given its |
| proper type... */ |
| TREE_TYPE (gnu_get_parent) = gnu_parent; |
| |
| /* ...and reference the _Parent field of this record. */ |
| gnu_field |
| = create_field_decl (parent_name_id, |
| gnu_parent, gnu_type, |
| has_rep |
| ? TYPE_SIZE (gnu_parent) : NULL_TREE, |
| has_rep |
| ? bitsize_zero_node : NULL_TREE, |
| parent_packed, 1); |
| DECL_INTERNAL_P (gnu_field) = 1; |
| TREE_OPERAND (gnu_get_parent, 1) = gnu_field; |
| TYPE_FIELDS (gnu_type) = gnu_field; |
| } |
| |
| /* Make the fields for the discriminants and put them into the record |
| unless it's an Unchecked_Union. */ |
| if (has_discr) |
| for (gnat_field = First_Stored_Discriminant (gnat_entity); |
| Present (gnat_field); |
| gnat_field = Next_Stored_Discriminant (gnat_field)) |
| { |
| /* If this is a record extension and this discriminant is the |
| renaming of another discriminant, we've handled it above. */ |
| if (is_extension |
| && Present (Corresponding_Discriminant (gnat_field))) |
| continue; |
| |
| gnu_field |
| = gnat_to_gnu_field (gnat_field, gnu_type, packed, definition, |
| debug_info_p); |
| |
| /* Make an expression using a PLACEHOLDER_EXPR from the |
| FIELD_DECL node just created and link that with the |
| corresponding GNAT defining identifier. */ |
| save_gnu_tree (gnat_field, |
| build3 (COMPONENT_REF, TREE_TYPE (gnu_field), |
| build0 (PLACEHOLDER_EXPR, gnu_type), |
| gnu_field, NULL_TREE), |
| true); |
| |
| if (!is_unchecked_union) |
| { |
| DECL_CHAIN (gnu_field) = gnu_field_list; |
| gnu_field_list = gnu_field; |
| } |
| } |
| |
| /* If we have a derived untagged type that renames discriminants in |
| the parent type, the (stored) discriminants are just a copy of the |
| discriminants of the parent type. This means that any constraints |
| added by the renaming in the derivation are disregarded as far as |
| the layout of the derived type is concerned. To rescue them, we |
| change the type of the (stored) discriminants to a subtype with |
| the bounds of the type of the visible discriminants. */ |
| if (has_discr |
| && !is_extension |
| && Stored_Constraint (gnat_entity) != No_Elist) |
| for (gnat_constr = First_Elmt (Stored_Constraint (gnat_entity)); |
| gnat_constr != No_Elmt; |
| gnat_constr = Next_Elmt (gnat_constr)) |
| if (Nkind (Node (gnat_constr)) == N_Identifier |
| /* Ignore access discriminants. */ |
| && !Is_Access_Type (Etype (Node (gnat_constr))) |
| && Ekind (Entity (Node (gnat_constr))) == E_Discriminant) |
| { |
| Entity_Id gnat_discr = Entity (Node (gnat_constr)); |
| tree gnu_discr_type = gnat_to_gnu_type (Etype (gnat_discr)); |
| tree gnu_ref |
| = gnat_to_gnu_entity (Original_Record_Component (gnat_discr), |
| NULL_TREE, false); |
| |
| /* GNU_REF must be an expression using a PLACEHOLDER_EXPR built |
| just above for one of the stored discriminants. */ |
| gcc_assert (TREE_TYPE (TREE_OPERAND (gnu_ref, 0)) == gnu_type); |
| |
| if (gnu_discr_type != TREE_TYPE (gnu_ref)) |
| { |
| const unsigned prec = TYPE_PRECISION (TREE_TYPE (gnu_ref)); |
| tree gnu_subtype |
| = TYPE_UNSIGNED (TREE_TYPE (gnu_ref)) |
| ? make_unsigned_type (prec) : make_signed_type (prec); |
| TREE_TYPE (gnu_subtype) = TREE_TYPE (gnu_ref); |
| TYPE_EXTRA_SUBTYPE_P (gnu_subtype) = 1; |
| SET_TYPE_RM_MIN_VALUE (gnu_subtype, |
| TYPE_MIN_VALUE (gnu_discr_type)); |
| SET_TYPE_RM_MAX_VALUE (gnu_subtype, |
| TYPE_MAX_VALUE (gnu_discr_type)); |
| TREE_TYPE (gnu_ref) |
| = TREE_TYPE (TREE_OPERAND (gnu_ref, 1)) = gnu_subtype; |
| } |
| } |
| |
| /* If this is a derived type with discriminants and these discriminants |
| affect the initial shape it has inherited, factor them in. */ |
| if (has_discr |
| && !is_extension |
| && !Has_Record_Rep_Clause (gnat_entity) |
| && Stored_Constraint (gnat_entity) != No_Elist |
| && (gnat_parent_type = Underlying_Type (Etype (gnat_entity))) |
| && Is_Record_Type (gnat_parent_type) |
| && Is_Unchecked_Union (gnat_entity) |
| == Is_Unchecked_Union (gnat_parent_type) |
| && No_Reordering (gnat_entity) == No_Reordering (gnat_parent_type)) |
| { |
| tree gnu_parent_type |
| = TYPE_MAIN_VARIANT (gnat_to_gnu_type (gnat_parent_type)); |
| |
| if (TYPE_IS_PADDING_P (gnu_parent_type)) |
| gnu_parent_type = TREE_TYPE (TYPE_FIELDS (gnu_parent_type)); |
| |
| vec<subst_pair> gnu_subst_list |
| = build_subst_list (gnat_entity, gnat_parent_type, definition); |
| |
| /* Set the layout of the type to match that of the parent type, |
| doing required substitutions. If we are in minimal GNAT |
| encodings mode, we don't need debug info for the inner record |
| types, as they will be part of the embedding variant record's |
| debug info. */ |
| copy_and_substitute_in_layout |
| (gnat_entity, gnat_parent_type, gnu_type, gnu_parent_type, |
| gnu_subst_list, |
| debug_info_p && gnat_encodings != DWARF_GNAT_ENCODINGS_MINIMAL); |
| } |
| else |
| { |
| /* Add the fields into the record type and finish it up. */ |
| components_to_record (Component_List (record_definition), |
| gnat_entity, gnu_field_list, gnu_type, |
| packed, definition, false, all_rep, |
| is_unchecked_union, artificial_p, |
| debug_info_p, false, |
| all_rep ? NULL_TREE : bitsize_zero_node, |
| NULL); |
| |
| /* Empty classes have the size of a storage unit in C++. */ |
| if (TYPE_SIZE (gnu_type) == bitsize_zero_node |
| && Convention (gnat_entity) == Convention_CPP) |
| { |
| TYPE_SIZE (gnu_type) = bitsize_unit_node; |
| TYPE_SIZE_UNIT (gnu_type) = size_one_node; |
| compute_record_mode (gnu_type); |
| } |
| |
| /* If there are entities in the chain corresponding to components |
| that we did not elaborate, ensure we elaborate their types if |
| they are Itypes. */ |
| for (gnat_temp = First_Entity (gnat_entity); |
| Present (gnat_temp); |
| gnat_temp = Next_Entity (gnat_temp)) |
| if ((Ekind (gnat_temp) == E_Component |
| || Ekind (gnat_temp) == E_Discriminant) |
| && Is_Itype (Etype (gnat_temp)) |
| && !present_gnu_tree (gnat_temp)) |
| gnat_to_gnu_entity (Etype (gnat_temp), NULL_TREE, false); |
| } |
| |
| /* Fill in locations of fields. */ |
| annotate_rep (gnat_entity, gnu_type); |
| |
| /* If this is a record type associated with an exception definition, |
| equate its fields to those of the standard exception type. This |
| will make it possible to convert between them. */ |
| if (gnu_entity_name == exception_data_name_id) |
| { |
| tree gnu_std_field; |
| for (gnu_field = TYPE_FIELDS (gnu_type), |
| gnu_std_field = TYPE_FIELDS (except_type_node); |
| gnu_field; |
| gnu_field = DECL_CHAIN (gnu_field), |
| gnu_std_field = DECL_CHAIN (gnu_std_field)) |
| SET_DECL_ORIGINAL_FIELD_TO_FIELD (gnu_field, gnu_std_field); |
| gcc_assert (!gnu_std_field); |
| } |
| } |
| break; |
| |
| case E_Class_Wide_Subtype: |
| /* If an equivalent type is present, that is what we should use. |
| Otherwise, fall through to handle this like a record subtype |
| since it may have constraints. */ |
| if (gnat_equiv_type != gnat_entity) |
| { |
| gnu_decl = gnat_to_gnu_entity (gnat_equiv_type, NULL_TREE, false); |
| maybe_present = true; |
| break; |
| } |
| |
| /* ... fall through ... */ |
| |
| case E_Record_Subtype: |
| /* If Cloned_Subtype is Present it means this record subtype has |
| identical layout to that type or subtype and we should use |
| that GCC type for this one. The front end guarantees that |
| the component list is shared. */ |
| if (Present (Cloned_Subtype (gnat_entity))) |
| { |
| gnu_decl = gnat_to_gnu_entity (Cloned_Subtype (gnat_entity), |
| NULL_TREE, false); |
| gnat_annotate_type = Cloned_Subtype (gnat_entity); |
| saved = true; |
| break; |
| } |
| |
| /* Otherwise, first ensure the base type is elaborated. Then, if we are |
| changing the type, make a new type with each field having the type of |
| the field in the new subtype but the position computed by transforming |
| every discriminant reference according to the constraints. We don't |
| see any difference between private and non-private type here since |
| derivations from types should have been deferred until the completion |
| of the private type. */ |
| else |
| { |
| Entity_Id gnat_base_type = Implementation_Base_Type (gnat_entity); |
| |
| if (!definition) |
| { |
| defer_incomplete_level++; |
| this_deferred = true; |
| } |
| |
| tree gnu_base_type |
| = TYPE_MAIN_VARIANT (gnat_to_gnu_type (gnat_base_type)); |
| |
| if (present_gnu_tree (gnat_entity)) |
| { |
| maybe_present = true; |
| break; |
| } |
| |
| /* When the subtype has discriminants and these discriminants affect |
| the initial shape it has inherited, factor them in. But for an |
| Unchecked_Union (it must be an Itype), just return the type. */ |
| if (Has_Discriminants (gnat_entity) |
| && Stored_Constraint (gnat_entity) != No_Elist |
| && !Is_For_Access_Subtype (gnat_entity) |
| && Is_Record_Type (gnat_base_type) |
| && !Is_Unchecked_Union (gnat_base_type)) |
| { |
| vec<subst_pair> gnu_subst_list |
| = build_subst_list (gnat_entity, gnat_base_type, definition); |
| tree gnu_unpad_base_type; |
| |
| gnu_type = make_node (RECORD_TYPE); |
| TYPE_NAME (gnu_type) = gnu_entity_name; |
| if (gnat_encodings == DWARF_GNAT_ENCODINGS_MINIMAL) |
| { |
| /* Use the ultimate base record type as the debug type. |
| Subtypes and derived types bring no useful |
| information. */ |
| Entity_Id gnat_debug_type = gnat_entity; |
| while (Etype (gnat_debug_type) != gnat_debug_type) |
| gnat_debug_type = Etype (gnat_debug_type); |
| tree gnu_debug_type |
| = TYPE_MAIN_VARIANT (gnat_to_gnu_type (gnat_debug_type)); |
| SET_TYPE_DEBUG_TYPE (gnu_type, gnu_debug_type); |
| } |
| TYPE_PACKED (gnu_type) = TYPE_PACKED (gnu_base_type); |
| TYPE_REVERSE_STORAGE_ORDER (gnu_type) |
| = Reverse_Storage_Order (gnat_entity); |
| process_attributes (&gnu_type, &attr_list, true, gnat_entity); |
| |
| /* Set the size, alignment and alias set of the type to match |
| those of the base type, doing required substitutions. */ |
| copy_and_substitute_in_size (gnu_type, gnu_base_type, |
| gnu_subst_list); |
| |
| if (TYPE_IS_PADDING_P (gnu_base_type)) |
| gnu_unpad_base_type = TREE_TYPE (TYPE_FIELDS (gnu_base_type)); |
| else |
| gnu_unpad_base_type = gnu_base_type; |
| |
| /* Set the layout of the type to match that of the base type, |
| doing required substitutions. We will output debug info |
| manually below so pass false as last argument. */ |
| copy_and_substitute_in_layout (gnat_entity, gnat_base_type, |
| gnu_type, gnu_unpad_base_type, |
| gnu_subst_list, false); |
| |
| /* Fill in locations of fields. */ |
| annotate_rep (gnat_entity, gnu_type); |
| |
| /* If debugging information is being written for the type and if |
| we are asked to output such encodings, write a record that |
| shows what we are a subtype of and also make a variable that |
| indicates our size, if still variable. */ |
| if (gnat_encodings != DWARF_GNAT_ENCODINGS_MINIMAL) |
| { |
| tree gnu_subtype_marker = make_node (RECORD_TYPE); |
| tree gnu_unpad_base_name |
| = TYPE_IDENTIFIER (gnu_unpad_base_type); |
| tree gnu_size_unit = TYPE_SIZE_UNIT (gnu_type); |
| |
| TYPE_NAME (gnu_subtype_marker) |
| = create_concat_name (gnat_entity, "XVS"); |
| finish_record_type (gnu_subtype_marker, |
| create_field_decl (gnu_unpad_base_name, |
| build_reference_type |
| (gnu_unpad_base_type), |
| gnu_subtype_marker, |
| NULL_TREE, NULL_TREE, |
| 0, 0), |
| 0, true); |
| |
| add_parallel_type (gnu_type, gnu_subtype_marker); |
| |
| if (definition |
| && TREE_CODE (gnu_size_unit) != INTEGER_CST |
| && !CONTAINS_PLACEHOLDER_P (gnu_size_unit)) |
| TYPE_SIZE_UNIT (gnu_subtype_marker) |
| = create_var_decl (create_concat_name (gnat_entity, |
| "XVZ"), |
| NULL_TREE, sizetype, gnu_size_unit, |
| false, false, false, false, false, |
| true, debug_info_p, |
| NULL, gnat_entity); |
| } |
| } |
| |
| /* Otherwise, go down all the components in the new type and make |
| them equivalent to those in the base type. */ |
| else |
| { |
| gnu_type = gnu_base_type; |
| |
| for (gnat_temp = First_Entity (gnat_entity); |
| Present (gnat_temp); |
| gnat_temp = Next_Entity (gnat_temp)) |
| if ((Ekind (gnat_temp) == E_Discriminant |
| && !Is_Unchecked_Union (gnat_base_type)) |
| || Ekind (gnat_temp) == E_Component) |
| save_gnu_tree (gnat_temp, |
| gnat_to_gnu_field_decl |
| (Original_Record_Component (gnat_temp)), |
| false); |
| } |
| } |
| break; |
| |
| case E_Access_Subprogram_Type: |
| case E_Anonymous_Access_Subprogram_Type: |
| /* Use the special descriptor type for dispatch tables if needed, |
| that is to say for the Prim_Ptr of a-tags.ads and its clones. |
| Note that we are only required to do so for static tables in |
| order to be compatible with the C++ ABI, but Ada 2005 allows |
| to extend library level tagged types at the local level so |
| we do it in the non-static case as well. */ |
| if (TARGET_VTABLE_USES_DESCRIPTORS |
| && Is_Dispatch_Table_Entity (gnat_entity)) |
| { |
| gnu_type = fdesc_type_node; |
| gnu_size = TYPE_SIZE (gnu_type); |
| break; |
| } |
| |
| /* ... fall through ... */ |
| |
| case E_Allocator_Type: |
| case E_Access_Type: |
| case E_Access_Attribute_Type: |
| case E_Anonymous_Access_Type: |
| case E_General_Access_Type: |
| { |
| /* The designated type and its equivalent type for gigi. */ |
| Entity_Id gnat_desig_type = Directly_Designated_Type (gnat_entity); |
| Entity_Id gnat_desig_equiv = Gigi_Equivalent_Type (gnat_desig_type); |
| /* Whether it comes from a limited with. */ |
| const bool is_from_limited_with |
| = (Is_Incomplete_Type (gnat_desig_equiv) |
| && From_Limited_With (gnat_desig_equiv)); |
| /* Whether it is a completed Taft Amendment type. Such a type is to |
| be treated as coming from a limited with clause if it is not in |
| the main unit, i.e. we break potential circularities here in case |
| the body of an external unit is loaded for inter-unit inlining. */ |
| const bool is_completed_taft_type |
| = (Is_Incomplete_Type (gnat_desig_equiv) |
| && Has_Completion_In_Body (gnat_desig_equiv) |
| && Present (Full_View (gnat_desig_equiv))); |
| /* The "full view" of the designated type. If this is an incomplete |
| entity from a limited with, treat its non-limited view as the full |
| view. Otherwise, if this is an incomplete or private type, use the |
| full view. In the former case, we might point to a private type, |
| in which case, we need its full view. Also, we want to look at the |
| actual type used for the representation, so this takes a total of |
| three steps. */ |
| Entity_Id gnat_desig_full_direct_first |
| = (is_from_limited_with |
| ? Non_Limited_View (gnat_desig_equiv) |
| : (Is_Incomplete_Or_Private_Type (gnat_desig_equiv) |
| ? Full_View (gnat_desig_equiv) : Empty)); |
| Entity_Id gnat_desig_full_direct |
| = ((is_from_limited_with |
| && Present (gnat_desig_full_direct_first) |
| && Is_Private_Type (gnat_desig_full_direct_first)) |
| ? Full_View (gnat_desig_full_direct_first) |
| : gnat_desig_full_direct_first); |
| Entity_Id gnat_desig_full |
| = Gigi_Equivalent_Type (gnat_desig_full_direct); |
| /* The type actually used to represent the designated type, either |
| gnat_desig_full or gnat_desig_equiv. */ |
| Entity_Id gnat_desig_rep; |
| /* We want to know if we'll be seeing the freeze node for any |
| incomplete type we may be pointing to. */ |
| const bool in_main_unit |
| = (Present (gnat_desig_full) |
| ? In_Extended_Main_Code_Unit (gnat_desig_full) |
| : In_Extended_Main_Code_Unit (gnat_desig_type)); |
| /* True if we make a dummy type here. */ |
| bool made_dummy = false; |
| /* The mode to be used for the pointer type. */ |
| scalar_int_mode p_mode; |
| /* The GCC type used for the designated type. */ |
| tree gnu_desig_type = NULL_TREE; |
| |
| if (!int_mode_for_size (esize, 0).exists (&p_mode) |
| || !targetm.valid_pointer_mode (p_mode)) |
| p_mode = ptr_mode; |
| |
| /* If either the designated type or its full view is an unconstrained |
| array subtype, replace it with the type it's a subtype of. This |
| avoids problems with multiple copies of unconstrained array types. |
| Likewise, if the designated type is a subtype of an incomplete |
| record type, use the parent type to avoid order of elaboration |
| issues. This can lose some code efficiency, but there is no |
| alternative. */ |
| if (Ekind (gnat_desig_equiv) == E_Array_Subtype |
| && !Is_Constrained (gnat_desig_equiv)) |
| gnat_desig_equiv = Etype (gnat_desig_equiv); |
| if (Present (gnat_desig_full) |
| && ((Ekind (gnat_desig_full) == E_Array_Subtype |
| && !Is_Constrained (gnat_desig_full)) |
| || (Ekind (gnat_desig_full) == E_Record_Subtype |
| && Ekind (Etype (gnat_desig_full)) == E_Record_Type))) |
| gnat_desig_full = Etype (gnat_desig_full); |
| |
| /* Set the type that's the representation of the designated type. */ |
| gnat_desig_rep |
| = Present (gnat_desig_full) ? gnat_desig_full : gnat_desig_equiv; |
| |
| /* If we already know what the full type is, use it. */ |
| if (Present (gnat_desig_full) && present_gnu_tree (gnat_desig_full)) |
| gnu_desig_type = TREE_TYPE (get_gnu_tree (gnat_desig_full)); |
| |
| /* Get the type of the thing we are to point to and build a pointer to |
| it. If it is a reference to an incomplete or private type with a |
| full view that is a record, an array or an access, make a dummy type |
| and get the actual type later when we have verified it is safe. */ |
| else if ((!in_main_unit |
| && !present_gnu_tree (gnat_desig_equiv) |
| && Present (gnat_desig_full) |
| && (Is_Record_Type (gnat_desig_full) |
| || Is_Array_Type (gnat_desig_full) |
| || Is_Access_Type (gnat_desig_full))) |
| /* Likewise if this is a reference to a record, an array or a |
| subprogram type and we are to defer elaborating incomplete |
| types. We do this because this access type may be the full |
| view of a private type. */ |
| || ((!in_main_unit || imported_p) |
| && defer_incomplete_level != 0 |
| && !present_gnu_tree (gnat_desig_equiv) |
| && (Is_Record_Type (gnat_desig_rep) |
| || Is_Array_Type (gnat_desig_rep) |
| || Ekind (gnat_desig_rep) == E_Subprogram_Type)) |
| /* If this is a reference from a limited_with type back to our |
| main unit and there's a freeze node for it, either we have |
| already processed the declaration and made the dummy type, |
| in which case we just reuse the latter, or we have not yet, |
| in which case we make the dummy type and it will be reused |
| when the declaration is finally processed. In both cases, |
| the pointer eventually created below will be automatically |
| adjusted when the freeze node is processed. */ |
| || (in_main_unit |
| && is_from_limited_with |
| && Present (Freeze_Node (gnat_desig_rep)))) |
| { |
| gnu_desig_type = make_dummy_type (gnat_desig_equiv); |
| made_dummy = true; |
| } |
| |
| /* Otherwise handle the case of a pointer to itself. */ |
| else if (gnat_desig_equiv == gnat_entity) |
| { |
| gnu_type |
| = build_pointer_type_for_mode (void_type_node, p_mode, |
| No_Strict_Aliasing (gnat_entity)); |
| TREE_TYPE (gnu_type) = TYPE_POINTER_TO (gnu_type) = gnu_type; |
| } |
| |
| /* If expansion is disabled, the equivalent type of a concurrent type |
| is absent, so we use the void pointer type. */ |
| else if (type_annotate_only && No (gnat_desig_equiv)) |
| gnu_type = ptr_type_node; |
| |
| /* If the ultimately designated type is an incomplete type with no full |
| view, we use the void pointer type in LTO mode to avoid emitting a |
| dummy type in the GIMPLE IR. We cannot do that in regular mode as |
| the name of the dummy type in used by GDB for a global lookup. */ |
| else if (Ekind (gnat_desig_rep) == E_Incomplete_Type |
| && No (Full_View (gnat_desig_rep)) |
| && flag_generate_lto) |
| gnu_type = ptr_type_node; |
| |
| /* Finally, handle the default case where we can just elaborate our |
| designated type. */ |
| else |
| gnu_desig_type = gnat_to_gnu_type (gnat_desig_equiv); |
| |
| /* It is possible that a call to gnat_to_gnu_type above resolved our |
| type. If so, just return it. */ |
| if (present_gnu_tree (gnat_entity)) |
| { |
| maybe_present = true; |
| break; |
| } |
| |
| /* Access-to-unconstrained-array types need a special treatment. */ |
| if (Is_Array_Type (gnat_desig_rep) && !Is_Constrained (gnat_desig_rep)) |
| { |
| /* If the processing above got something that has a pointer, then |
| we are done. This could have happened either because the type |
| was elaborated or because somebody else executed the code. */ |
| if (!TYPE_POINTER_TO (gnu_desig_type)) |
| build_dummy_unc_pointer_types (gnat_desig_equiv, gnu_desig_type); |
| |
| gnu_type = TYPE_POINTER_TO (gnu_desig_type); |
| } |
| |
| /* If we haven't done it yet, build the pointer type the usual way. */ |
| else if (!gnu_type) |
| { |
| /* Modify the designated type if we are pointing only to constant |
| objects, but don't do it for a dummy type. */ |
| if (Is_Access_Constant (gnat_entity) |
| && !TYPE_IS_DUMMY_P (gnu_desig_type)) |
| gnu_desig_type |
| = change_qualified_type (gnu_desig_type, TYPE_QUAL_CONST); |
| |
| gnu_type |
| = build_pointer_type_for_mode (gnu_desig_type, p_mode, |
| No_Strict_Aliasing (gnat_entity)); |
| } |
| |
| /* If the designated type is not declared in the main unit and we made |
| a dummy node for it, save our definition, elaborate the actual type |
| and replace the dummy type we made with the actual one. But if we |
| are to defer actually looking up the actual type, make an entry in |
| the deferred list instead. If this is from a limited with, we may |
| have to defer until the end of the current unit. */ |
| if (!in_main_unit && made_dummy) |
| { |
| if (TYPE_IS_FAT_POINTER_P (gnu_type) && esize == POINTER_SIZE) |
| gnu_type |
| = build_pointer_type (TYPE_OBJECT_RECORD_TYPE (gnu_desig_type)); |
| |
| process_attributes (&gnu_type, &attr_list, false, gnat_entity); |
| gnu_decl = create_type_decl (gnu_entity_name, gnu_type, |
| artificial_p, debug_info_p, |
| gnat_entity); |
| this_made_decl = true; |
| gnu_type = TREE_TYPE (gnu_decl); |
| save_gnu_tree (gnat_entity, gnu_decl, false); |
| saved = true; |
| |
| if (defer_incomplete_level == 0 |
| && !is_from_limited_with |
| && !is_completed_taft_type) |
| { |
| update_pointer_to (TYPE_MAIN_VARIANT (gnu_desig_type), |
| gnat_to_gnu_type (gnat_desig_equiv)); |
| } |
| else |
| { |
| struct incomplete *p = XNEW (struct incomplete); |
| struct incomplete **head |
| = (is_from_limited_with || is_completed_taft_type |
| ? &defer_limited_with_list : &defer_incomplete_list); |
| |
| p->old_type = gnu_desig_type; |
| p->full_type = gnat_desig_equiv; |
| p->next = *head; |
| *head = p; |
| } |
| } |
| } |
| break; |
| |
| case E_Access_Protected_Subprogram_Type: |
| case E_Anonymous_Access_Protected_Subprogram_Type: |
| /* If we are just annotating types and have no equivalent record type, |
| just use the void pointer type. */ |
| if (type_annotate_only && gnat_equiv_type == gnat_entity) |
| gnu_type = ptr_type_node; |
| |
| /* The run-time representation is the equivalent type. */ |
| else |
| { |
| gnu_type = gnat_to_gnu_type (gnat_equiv_type); |
| maybe_present = true; |
| } |
| |
| /* The designated subtype must be elaborated as well, if it does |
| not have its own freeze node. */ |
| if (Is_Itype (Directly_Designated_Type (gnat_entity)) |
| && !present_gnu_tree (Directly_Designated_Type (gnat_entity)) |
| && No (Freeze_Node (Directly_Designated_Type (gnat_entity))) |
| && !Is_Record_Type (Scope (Directly_Designated_Type (gnat_entity)))) |
| gnat_to_gnu_entity (Directly_Designated_Type (gnat_entity), |
| NULL_TREE, false); |
| |
| break; |
| |
| case E_Access_Subtype: |
| /* We treat this as identical to its base type; any constraint is |
| meaningful only to the front-end. */ |
| gnu_decl = gnat_to_gnu_entity (Etype (gnat_entity), NULL_TREE, false); |
| saved = true; |
| |
| /* The designated subtype must be elaborated as well, if it does |
| not have its own freeze node. But designated subtypes created |
| for constrained components of records with discriminants are |
| not frozen by the front-end and not elaborated here, because |
| their use may appear before the base type is frozen and it is |
| not clear that they are needed in gigi. With the current model, |
| there is no correct place where they could be elaborated. */ |
| if (Is_Itype (Directly_Designated_Type (gnat_entity)) |
| && !present_gnu_tree (Directly_Designated_Type (gnat_entity)) |
| && Is_Frozen (Directly_Designated_Type (gnat_entity)) |
| && No (Freeze_Node (Directly_Designated_Type (gnat_entity)))) |
| { |
| /* If we are to defer elaborating incomplete types, make a dummy |
| type node and elaborate it later. */ |
| if (defer_incomplete_level != 0) |
| { |
| struct incomplete *p = XNEW (struct incomplete); |
| |
| p->old_type |
| = make_dummy_type (Directly_Designated_Type (gnat_entity)); |
| p->full_type = Directly_Designated_Type (gnat_entity); |
| p->next = defer_incomplete_list; |
| defer_incomplete_list = p; |
| } |
| else if (!Is_Incomplete_Or_Private_Type |
| (Base_Type (Directly_Designated_Type (gnat_entity)))) |
| gnat_to_gnu_entity (Directly_Designated_Type (gnat_entity), |
| NULL_TREE, false); |
| } |
| break; |
| |
| /* Subprogram Entities |
| |
| The following access functions are defined for subprograms: |
| |
| Etype Return type or Standard_Void_Type. |
| First_Formal The first formal parameter. |
| Is_Imported Indicates that the subprogram has appeared in |
| an INTERFACE or IMPORT pragma. For now we |
| assume that the external language is C. |
| Is_Exported Likewise but for an EXPORT pragma. |
| Is_Inlined True if the subprogram is to be inlined. |
| |
| Each parameter is first checked by calling must_pass_by_ref on its |
| type to determine if it is passed by reference. For parameters which |
| are copied in, if they are Ada In Out or Out parameters, their return |
| value becomes part of a record which becomes the return type of the |
| function (C function - note that this applies only to Ada procedures |
| so there is no Ada return type). Additional code to store back the |
| parameters will be generated on the caller side. This transformation |
| is done here, not in the front-end. |
| |
| The intended result of the transformation can be seen from the |
| equivalent source rewritings that follow: |
| |
| struct temp {int a,b}; |
| procedure P (A,B: In Out ...) is temp P (int A,B) |
| begin { |
| .. .. |
| end P; return {A,B}; |
| } |
| |
| temp t; |
| P(X,Y); t = P(X,Y); |
| X = t.a , Y = t.b; |
| |
| For subprogram types we need to perform mainly the same conversions to |
| GCC form that are needed for procedures and function declarations. The |
| only difference is that at the end, we make a type declaration instead |
| of a function declaration. */ |
| |
| case E_Subprogram_Type: |
| case E_Function: |
| case E_Procedure: |
| { |
| tree gnu_ext_name |
| = gnu_ext_name_for_subprog (gnat_entity, gnu_entity_name); |
| const enum inline_status_t inline_status |
| = inline_status_for_subprog (gnat_entity); |
| bool public_flag = Is_Public (gnat_entity) || imported_p; |
| /* Subprograms marked both Intrinsic and Always_Inline need not |
| have a body of their own. */ |
| bool extern_flag |
| = ((Is_Public (gnat_entity) && !definition) |
| || imported_p |
| || (Convention (gnat_entity) == Convention_Intrinsic |
| && Has_Pragma_Inline_Always (gnat_entity))); |
| tree gnu_param_list; |
| |
| /* A parameter may refer to this type, so defer completion of any |
| incomplete types. */ |
| if (kind == E_Subprogram_Type && !definition) |
| { |
| defer_incomplete_level++; |
| this_deferred = true; |
| } |
| |
| /* If the subprogram has an alias, it is probably inherited, so |
| we can use the original one. If the original "subprogram" |
| is actually an enumeration literal, it may be the first use |
| of its type, so we must elaborate that type now. */ |
| if (Present (Alias (gnat_entity))) |
| { |
| const Entity_Id gnat_renamed = Renamed_Object (gnat_entity); |
| |
| if (Ekind (Alias (gnat_entity)) == E_Enumeration_Literal) |
| gnat_to_gnu_entity (Etype (Alias (gnat_entity)), NULL_TREE, |
| false); |
| |
| gnu_decl |
| = gnat_to_gnu_entity (Alias (gnat_entity), gnu_expr, false); |
| |
| /* Elaborate any Itypes in the parameters of this entity. */ |
| for (gnat_temp = First_Formal_With_Extras (gnat_entity); |
| Present (gnat_temp); |
| gnat_temp = Next_Formal_With_Extras (gnat_temp)) |
| if (Is_Itype (Etype (gnat_temp))) |
| gnat_to_gnu_entity (Etype (gnat_temp), NULL_TREE, false); |
| |
| /* Materialize renamed subprograms in the debugging information |
| when the renamed object is compile time known. We can consider |
| such renamings as imported declarations. |
| |
| Because the parameters in generics instantiation are generally |
| materialized as renamings, we ofter end up having both the |
| renamed subprogram and the renaming in the same context and with |
| the same name: in this case, renaming is both useless debug-wise |
| and potentially harmful as name resolution in the debugger could |
| return twice the same entity! So avoid this case. */ |
| if (debug_info_p && !artificial_p |
| && !(get_debug_scope (gnat_entity, NULL) |
| == get_debug_scope (gnat_renamed, NULL) |
| && Name_Equals (Chars (gnat_entity), |
| Chars (gnat_renamed))) |
| && Present (gnat_renamed) |
| && (Ekind (gnat_renamed) == E_Function |
| || Ekind (gnat_renamed) == E_Procedure) |
| && gnu_decl |
| && TREE_CODE (gnu_decl) == FUNCTION_DECL) |
| { |
| tree decl = build_decl (input_location, IMPORTED_DECL, |
| gnu_entity_name, void_type_node); |
| IMPORTED_DECL_ASSOCIATED_DECL (decl) = gnu_decl; |
| gnat_pushdecl (decl, gnat_entity); |
| } |
| |
| break; |
| } |
| |
| /* Get the GCC tree for the (underlying) subprogram type. If the |
| entity is an actual subprogram, also get the parameter list. */ |
| gnu_type |
| = gnat_to_gnu_subprog_type (gnat_entity, definition, debug_info_p, |
| &gnu_param_list); |
| if (DECL_P (gnu_type)) |
| { |
| gnu_decl = gnu_type; |
| gnu_type = TREE_TYPE (gnu_decl); |
| break; |
| } |
| |
| /* Deal with platform-specific calling conventions. */ |
| if (Has_Stdcall_Convention (gnat_entity)) |
| prepend_one_attribute |
| (&attr_list, ATTR_MACHINE_ATTRIBUTE, |
| get_identifier ("stdcall"), NULL_TREE, |
| gnat_entity); |
| |
| /* If we should request stack realignment for a foreign convention |
| subprogram, do so. Note that this applies to task entry points |
| in particular. */ |
| if (FOREIGN_FORCE_REALIGN_STACK && foreign) |
| prepend_one_attribute |
| (&attr_list, ATTR_MACHINE_ATTRIBUTE, |
| get_identifier ("force_align_arg_pointer"), NULL_TREE, |
| gnat_entity); |
| |
| /* Deal with a pragma Linker_Section on a subprogram. */ |
| if ((kind == E_Function || kind == E_Procedure) |
| && Present (Linker_Section_Pragma (gnat_entity))) |
| prepend_one_attribute_pragma (&attr_list, |
| Linker_Section_Pragma (gnat_entity)); |
| |
| /* If we are defining the subprogram and it has an Address clause |
| we must get the address expression from the saved GCC tree for the |
| subprogram if it has a Freeze_Node. Otherwise, we elaborate |
| the address expression here since the front-end has guaranteed |
| in that case that the elaboration has no effects. If there is |
| an Address clause and we are not defining the object, just |
| make it a constant. */ |
| if (Present (Address_Clause (gnat_entity))) |
| { |
| tree gnu_address = NULL_TREE; |
| |
| if (definition) |
| gnu_address |
| = (present_gnu_tree (gnat_entity) |
| ? get_gnu_tree (gnat_entity) |
| : gnat_to_gnu (Expression (Address_Clause (gnat_entity)))); |
| |
| save_gnu_tree (gnat_entity, NULL_TREE, false); |
| |
| /* Convert the type of the object to a reference type that can |
| alias everything as per RM 13.3(19). */ |
| gnu_type |
| = build_reference_type_for_mode (gnu_type, ptr_mode, true); |
| if (gnu_address) |
| gnu_address = convert (gnu_type, gnu_address); |
| |
| gnu_decl |
| = create_var_decl (gnu_entity_name, gnu_ext_name, gnu_type, |
| gnu_address, false, Is_Public (gnat_entity), |
| extern_flag, false, false, artificial_p, |
| debug_info_p, NULL, gnat_entity); |
| DECL_BY_REF_P (gnu_decl) = 1; |
| } |
| |
| /* If this is a mere subprogram type, just create the declaration. */ |
| else if (kind == E_Subprogram_Type) |
| { |
| process_attributes (&gnu_type, &attr_list, false, gnat_entity); |
| |
| gnu_decl |
| = create_type_decl (gnu_entity_name, gnu_type, artificial_p, |
| debug_info_p, gnat_entity); |
| } |
| |
| /* Otherwise create the subprogram declaration with the external name, |
| the type and the parameter list. However, if this a reference to |
| the allocation routines, reuse the canonical declaration nodes as |
| they come with special properties. */ |
| else |
| { |
| if (extern_flag && gnu_ext_name == DECL_NAME (malloc_decl)) |
| gnu_decl = malloc_decl; |
| else if (extern_flag && gnu_ext_name == DECL_NAME (realloc_decl)) |
| gnu_decl = realloc_decl; |
| else |
| { |
| gnu_decl |
| = create_subprog_decl (gnu_entity_name, gnu_ext_name, |
| gnu_type, gnu_param_list, |
| inline_status, public_flag, |
| extern_flag, artificial_p, |
| debug_info_p, |
| definition && imported_p, attr_list, |
| gnat_entity); |
| |
| DECL_STUBBED_P (gnu_decl) |
| = (Convention (gnat_entity) == Convention_Stubbed); |
| } |
| } |
| } |
| break; |
| |
| case E_Incomplete_Type: |
| case E_Incomplete_Subtype: |
| case E_Private_Type: |
| case E_Private_Subtype: |
| case E_Limited_Private_Type: |
| case E_Limited_Private_Subtype: |
| case E_Record_Type_With_Private: |
| case E_Record_Subtype_With_Private: |
| { |
| const bool is_from_limited_with |
| = (IN (kind, Incomplete_Kind) && From_Limited_With (gnat_entity)); |
| /* Get the "full view" of this entity. If this is an incomplete |
| entity from a limited with, treat its non-limited view as the |
| full view. Otherwise, use either the full view or the underlying |
| full view, whichever is present. This is used in all the tests |
| below. */ |
| const Entity_Id full_view |
| = is_from_limited_with |
| ? Non_Limited_View (gnat_entity) |
| : Present (Full_View (gnat_entity)) |
| ? Full_View (gnat_entity) |
| : IN (kind, Private_Kind) |
| ? Underlying_Full_View (gnat_entity) |
| : Empty; |
| |
| /* If this is an incomplete type with no full view, it must be a Taft |
| Amendment type or an incomplete type coming from a limited context, |
| in which cases we return a dummy type. Otherwise, we just get the |
| type from its Etype. */ |
| if (No (full_view)) |
| { |
| if (kind == E_Incomplete_Type) |
| { |
| gnu_type = make_dummy_type (gnat_entity); |
| gnu_decl = TYPE_STUB_DECL (gnu_type); |
| } |
| else |
| { |
| gnu_decl |
| = gnat_to_gnu_entity (Etype (gnat_entity), NULL_TREE, false); |
| maybe_present = true; |
| } |
| } |
| |
| /* Or else, if we already made a type for the full view, reuse it. */ |
| else if (present_gnu_tree (full_view)) |
| gnu_decl = get_gnu_tree (full_view); |
| |
| /* Or else, if we are not defining the type or there is no freeze |
| node on it, get the type for the full view. Likewise if this is |
| a limited_with'ed type not declared in the main unit, which can |
| happen for incomplete formal types instantiated on a type coming |
| from a limited_with clause. */ |
| else if (!definition |
| || No (Freeze_Node (full_view)) |
| || (is_from_limited_with |
| && !In_Extended_Main_Code_Unit (full_view))) |
| { |
| gnu_decl = gnat_to_gnu_entity (full_view, NULL_TREE, false); |
| maybe_present = true; |
| } |
| |
| /* Otherwise, make a dummy type entry which will be replaced later. |
| Save it as the full declaration's type so we can do any needed |
| updates when we see it. */ |
| else |
| { |
| gnu_type = make_dummy_type (gnat_entity); |
| gnu_decl = TYPE_STUB_DECL (gnu_type); |
| if (Has_Completion_In_Body (gnat_entity)) |
| DECL_TAFT_TYPE_P (gnu_decl) = 1; |
| save_gnu_tree (full_view, gnu_decl, false); |
| } |
| } |
| break; |
| |
| case E_Class_Wide_Type: |
| /* Class-wide types are always transformed into their root type. */ |
| gnu_decl = gnat_to_gnu_entity (gnat_equiv_type, NULL_TREE, false); |
| maybe_present = true; |
| break; |
| |
| case E_Protected_Type: |
| case E_Protected_Subtype: |
| case E_Task_Type: |
| case E_Task_Subtype: |
| /* If we are just annotating types and have no equivalent record type, |
| just return void_type, except for root types that have discriminants |
| because the discriminants will very likely be used in the declarative |
| part of the associated body so they need to be translated. */ |
| if (type_annotate_only && gnat_equiv_type == gnat_entity) |
| { |
| if (definition |
| && Has_Discriminants (gnat_entity) |
| && Root_Type (gnat_entity) == gnat_entity) |
| { |
| tree gnu_field_list = NULL_TREE; |
| Entity_Id gnat_field; |
| |
| /* This is a minimal version of the E_Record_Type handling. */ |
| gnu_type = make_node (RECORD_TYPE); |
| TYPE_NAME (gnu_type) = gnu_entity_name; |
| |
| for (gnat_field = First_Stored_Discriminant (gnat_entity); |
| Present (gnat_field); |
| gnat_field = Next_Stored_Discriminant (gnat_field)) |
| { |
| tree gnu_field |
| = gnat_to_gnu_field (gnat_field, gnu_type, false, |
| definition, debug_info_p); |
| |
| save_gnu_tree (gnat_field, |
| build3 (COMPONENT_REF, TREE_TYPE (gnu_field), |
| build0 (PLACEHOLDER_EXPR, gnu_type), |
| gnu_field, NULL_TREE), |
| true); |
| |
| DECL_CHAIN (gnu_field) = gnu_field_list; |
| gnu_field_list = gnu_field; |
| } |
| |
| finish_record_type (gnu_type, nreverse (gnu_field_list), 0, |
| false); |
| } |
| else |
| gnu_type = void_type_node; |
| } |
| |
| /* Concurrent types are always transformed into their record type. */ |
| else |
| gnu_decl = gnat_to_gnu_entity (gnat_equiv_type, NULL_TREE, false); |
| maybe_present = true; |
| break; |
| |
| case E_Label: |
| gnu_decl = create_label_decl (gnu_entity_name, gnat_entity); |
| break; |
| |
| case E_Block: |
| case E_Loop: |
| /* Nothing at all to do here, so just return an ERROR_MARK and claim |
| we've already saved it, so we don't try to. */ |
| gnu_decl = error_mark_node; |
| saved = true; |
| break; |
| |
| case E_Abstract_State: |
| /* This is a SPARK annotation that only reaches here when compiling in |
| ASIS mode. */ |
| gcc_assert (type_annotate_only); |
| gnu_decl = error_mark_node; |
| saved = true; |
| break; |
| |
| default: |
| gcc_unreachable (); |
| } |
| |
| /* If we had a case where we evaluated another type and it might have |
| defined this one, handle it here. */ |
| if (maybe_present && present_gnu_tree (gnat_entity)) |
| { |
| gnu_decl = get_gnu_tree (gnat_entity); |
| saved = true; |
| } |
| |
| /* If we are processing a type and there is either no DECL for it or |
| we just made one, do some common processing for the type, such as |
| handling alignment and possible padding. */ |
| if (is_type && (!gnu_decl || this_made_decl)) |
| { |
| gcc_assert (!TYPE_IS_DUMMY_P (gnu_type)); |
| |
| /* Process the attributes, if not already done. Note that the type is |
| already defined so we cannot pass true for IN_PLACE here. */ |
| process_attributes (&gnu_type, &attr_list, false, gnat_entity); |
| |
| /* ??? Don't set the size for a String_Literal since it is either |
| confirming or we don't handle it properly (if the low bound is |
| non-constant). */ |
| if (!gnu_size && kind != E_String_Literal_Subtype) |
| { |
| Uint gnat_size = Known_Esize (gnat_entity) |
| ? Esize (gnat_entity) : RM_Size (gnat_entity); |
| gnu_size |
| = validate_size (gnat_size, gnu_type, gnat_entity, TYPE_DECL, |
| false, Has_Size_Clause (gnat_entity)); |
| } |
| |
| /* If a size was specified, see if we can make a new type of that size |
| by rearranging the type, for example from a fat to a thin pointer. */ |
| if (gnu_size) |
| { |
| gnu_type |
| = make_type_from_size (gnu_type, gnu_size, |
| Has_Biased_Representation (gnat_entity)); |
| |
| if (operand_equal_p (TYPE_SIZE (gnu_type), gnu_size, 0) |
| && operand_equal_p (rm_size (gnu_type), gnu_size, 0)) |
| gnu_size = NULL_TREE; |
| } |
| |
| /* If the alignment has not already been processed and this is not |
| an unconstrained array type, see if an alignment is specified. |
| If not, we pick a default alignment for atomic objects. */ |
| if (align != 0 || TREE_CODE (gnu_type) == UNCONSTRAINED_ARRAY_TYPE) |
| ; |
| else if (Known_Alignment (gnat_entity)) |
| { |
| align = validate_alignment (Alignment (gnat_entity), gnat_entity, |
| TYPE_ALIGN (gnu_type)); |
| |
| /* Warn on suspiciously large alignments. This should catch |
| errors about the (alignment,byte)/(size,bit) discrepancy. */ |
| if (align > BIGGEST_ALIGNMENT && Has_Alignment_Clause (gnat_entity)) |
| { |
| tree size; |
| |
| /* If a size was specified, take it into account. Otherwise |
| use the RM size for records or unions as the type size has |
| already been adjusted to the alignment. */ |
| if (gnu_size) |
| size = gnu_size; |
| else if (RECORD_OR_UNION_TYPE_P (gnu_type) |
| && !TYPE_FAT_POINTER_P (gnu_type)) |
| size = rm_size (gnu_type); |
| else |
| size = TYPE_SIZE (gnu_type); |
| |
| /* Consider an alignment as suspicious if the alignment/size |
| ratio is greater or equal to the byte/bit ratio. */ |
| if (tree_fits_uhwi_p (size) |
| && align >= tree_to_uhwi (size) * BITS_PER_UNIT) |
| post_error_ne ("?suspiciously large alignment specified for&", |
| Expression (Alignment_Clause (gnat_entity)), |
| gnat_entity); |
| } |
| } |
| else if (Is_Atomic_Or_VFA (gnat_entity) && !gnu_size |
| && tree_fits_uhwi_p (TYPE_SIZE (gnu_type)) |
| && integer_pow2p (TYPE_SIZE (gnu_type))) |
| align = MIN (BIGGEST_ALIGNMENT, |
| tree_to_uhwi (TYPE_SIZE (gnu_type))); |
| else if (Is_Atomic_Or_VFA (gnat_entity) && gnu_size |
| && tree_fits_uhwi_p (gnu_size) |
| && integer_pow2p (gnu_size)) |
| align = MIN (BIGGEST_ALIGNMENT, tree_to_uhwi (gnu_size)); |
| |
| /* See if we need to pad the type. If we did, and made a record, |
| the name of the new type may be changed. So get it back for |
| us when we make the new TYPE_DECL below. */ |
| if (gnu_size || align > 0) |
| gnu_type = maybe_pad_type (gnu_type, gnu_size, align, gnat_entity, |
| false, !gnu_decl, definition, false); |
| |
| if (TYPE_IS_PADDING_P (gnu_type)) |
| gnu_entity_name = TYPE_IDENTIFIER (gnu_type); |
| |
| /* Now set the RM size of the type. We cannot do it before padding |
| because we need to accept arbitrary RM sizes on integral types. */ |
| set_rm_size (RM_Size (gnat_entity), gnu_type, gnat_entity); |
| |
| /* Back-annotate the alignment of the type if not already set. */ |
| if (Unknown_Alignment (gnat_entity)) |
| { |
| unsigned int double_align, align; |
| bool is_capped_double, align_clause; |
| |
| /* If the default alignment of "double" or larger scalar types is |
| specifically capped and this is not an array with an alignment |
| clause on the component type, return the cap. */ |
| if ((double_align = double_float_alignment) > 0) |
| is_capped_double |
| = is_double_float_or_array (gnat_entity, &align_clause); |
| else if ((double_align = double_scalar_alignment) > 0) |
| is_capped_double |
| = is_double_scalar_or_array (gnat_entity, &align_clause); |
| else |
| is_capped_double = align_clause = false; |
| |
| if (is_capped_double && !align_clause) |
| align = double_align; |
| else |
| align = TYPE_ALIGN (gnu_type) / BITS_PER_UNIT; |
| |
| Set_Alignment (gnat_entity, UI_From_Int (align)); |
| } |
| |
| /* Likewise for the size, if any. */ |
| if (Unknown_Esize (gnat_entity) && TYPE_SIZE (gnu_type)) |
| { |
| tree gnu_size = TYPE_SIZE (gnu_type); |
| |
| /* If the size is self-referential, annotate the maximum value. */ |
| if (CONTAINS_PLACEHOLDER_P (gnu_size)) |
| gnu_size = max_size (gnu_size, true); |
| |
| /* If we are just annotating types and the type is tagged, the tag |
| and the parent components are not generated by the front-end so |
| alignment and sizes must be adjusted if there is no rep clause. */ |
| if (type_annotate_only |
| && Is_Tagged_Type (gnat_entity) |
| && Unknown_RM_Size (gnat_entity) |
| && !VOID_TYPE_P (gnu_type) |
| && (!TYPE_FIELDS (gnu_type) |
| || integer_zerop (bit_position (TYPE_FIELDS (gnu_type))))) |
| { |
| tree offset; |
| |
| if (Is_Derived_Type (gnat_entity)) |
| { |
| Entity_Id gnat_parent = Etype (Base_Type (gnat_entity)); |
| offset = UI_To_gnu (Esize (gnat_parent), bitsizetype); |
| Set_Alignment (gnat_entity, Alignment (gnat_parent)); |
| } |
| else |
| { |
| unsigned int align |
| = MAX (TYPE_ALIGN (gnu_type), POINTER_SIZE) / BITS_PER_UNIT; |
| offset = bitsize_int (POINTER_SIZE); |
| Set_Alignment (gnat_entity, UI_From_Int (align)); |
| } |
| |
| if (TYPE_FIELDS (gnu_type)) |
| offset |
| = round_up (offset, DECL_ALIGN (TYPE_FIELDS (gnu_type))); |
| |
| gnu_size = size_binop (PLUS_EXPR, gnu_size, offset); |
| gnu_size = round_up (gnu_size, POINTER_SIZE); |
| Uint uint_size = annotate_value (gnu_size); |
| Set_RM_Size (gnat_entity, uint_size); |
| Set_Esize (gnat_entity, uint_size); |
| } |
| |
| /* If there is a rep clause, only adjust alignment and Esize. */ |
| else if (type_annotate_only && Is_Tagged_Type (gnat_entity)) |
| { |
| unsigned int align |
| = MAX (TYPE_ALIGN (gnu_type), POINTER_SIZE) / BITS_PER_UNIT; |
| Set_Alignment (gnat_entity, UI_From_Int (align)); |
| gnu_size = round_up (gnu_size, POINTER_SIZE); |
| Set_Esize (gnat_entity, annotate_value (gnu_size)); |
| } |
| |
| /* Otherwise no adjustment is needed. */ |
| else |
| Set_Esize (gnat_entity, annotate_value (gnu_size)); |
| } |
| |
| /* Likewise for the RM size, if any. */ |
| if (Unknown_RM_Size (gnat_entity) && TYPE_SIZE (gnu_type)) |
| Set_RM_Size (gnat_entity, annotate_value (rm_size (gnu_type))); |
| |
| /* If we are at global level, GCC will have applied variable_size to |
| the type, but that won't have done anything. So, if it's not |
| a constant or self-referential, call elaborate_expression_1 to |
| make a variable for the size rather than calculating it each time. |
| Handle both the RM size and the actual size. */ |
| if (TYPE_SIZE (gnu_type) |
| && !TREE_CONSTANT (TYPE_SIZE (gnu_type)) |
| && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type)) |
| && global_bindings_p ()) |
| { |
| tree size = TYPE_SIZE (gnu_type); |
| |
| TYPE_SIZE (gnu_type) |
| = elaborate_expression_1 (size, gnat_entity, "SIZE", definition, |
| false); |
| |
| /* ??? For now, store the size as a multiple of the alignment in |
| bytes so that we can see the alignment from the tree. */ |
| TYPE_SIZE_UNIT (gnu_type) |
| = elaborate_expression_2 (TYPE_SIZE_UNIT (gnu_type), gnat_entity, |
| "SIZE_A_UNIT", definition, false, |
| TYPE_ALIGN (gnu_type)); |
| |
| /* ??? gnu_type may come from an existing type so the MULT_EXPR node |
| may not be marked by the call to create_type_decl below. */ |
| MARK_VISITED (TYPE_SIZE_UNIT (gnu_type)); |
| |
| if (TREE_CODE (gnu_type) == RECORD_TYPE) |
| { |
| tree variant_part = get_variant_part (gnu_type); |
| tree ada_size = TYPE_ADA_SIZE (gnu_type); |
| |
| if (variant_part) |
| { |
| tree union_type = TREE_TYPE (variant_part); |
| tree offset = DECL_FIELD_OFFSET (variant_part); |
| |
| /* If the position of the variant part is constant, subtract |
| it from the size of the type of the parent to get the new |
| size. This manual CSE reduces the data size. */ |
| if (TREE_CODE (offset) == INTEGER_CST) |
| { |
| tree bitpos = DECL_FIELD_BIT_OFFSET (variant_part); |
| TYPE_SIZE (union_type) |
| = size_binop (MINUS_EXPR, TYPE_SIZE (gnu_type), |
| bit_from_pos (offset, bitpos)); |
| TYPE_SIZE_UNIT (union_type) |
| = size_binop (MINUS_EXPR, TYPE_SIZE_UNIT (gnu_type), |
| byte_from_pos (offset, bitpos)); |
| } |
| else |
| { |
| TYPE_SIZE (union_type) |
| = elaborate_expression_1 (TYPE_SIZE (union_type), |
| gnat_entity, "VSIZE", |
| definition, false); |
| |
| /* ??? For now, store the size as a multiple of the |
| alignment in bytes so that we can see the alignment |
| from the tree. */ |
| TYPE_SIZE_UNIT (union_type) |
| = elaborate_expression_2 (TYPE_SIZE_UNIT (union_type), |
| gnat_entity, "VSIZE_A_UNIT", |
| definition, false, |
| TYPE_ALIGN (union_type)); |
| |
| /* ??? For now, store the offset as a multiple of the |
| alignment in bytes so that we can see the alignment |
| from the tree. */ |
| DECL_FIELD_OFFSET (variant_part) |
| = elaborate_expression_2 (offset, gnat_entity, |
| "VOFFSET", definition, false, |
| DECL_OFFSET_ALIGN |
| (variant_part)); |
| } |
| |
| DECL_SIZE (variant_part) = TYPE_SIZE (union_type); |
| DECL_SIZE_UNIT (variant_part) = TYPE_SIZE_UNIT (union_type); |
| } |
| |
| if (operand_equal_p (ada_size, size, 0)) |
| ada_size = TYPE_SIZE (gnu_type); |
| else |
| ada_size |
| = elaborate_expression_1 (ada_size, gnat_entity, "RM_SIZE", |
| definition, false); |
| SET_TYPE_ADA_SIZE (gnu_type, ada_size); |
| } |
| } |
| |
| /* Similarly, if this is a record type or subtype at global level, call |
| elaborate_expression_2 on any field position. Skip any fields that |
| we haven't made trees for to avoid problems with class-wide types. */ |
| if (IN (kind, Record_Kind) && global_bindings_p ()) |
| for (gnat_temp = First_Entity (gnat_entity); Present (gnat_temp); |
| gnat_temp = Next_Entity (gnat_temp)) |
| if (Ekind (gnat_temp) == E_Component && present_gnu_tree (gnat_temp)) |
| { |
| tree gnu_field = get_gnu_tree (gnat_temp); |
| |
| /* ??? For now, store the offset as a multiple of the alignment |
| in bytes so that we can see the alignment from the tree. */ |
| if (!TREE_CONSTANT (DECL_FIELD_OFFSET (gnu_field)) |
| && !CONTAINS_PLACEHOLDER_P (DECL_FIELD_OFFSET (gnu_field))) |
| { |
| DECL_FIELD_OFFSET (gnu_field) |
| = elaborate_expression_2 (DECL_FIELD_OFFSET (gnu_field), |
| gnat_temp, "OFFSET", definition, |
| false, |
| DECL_OFFSET_ALIGN (gnu_field)); |
| |
| /* ??? The context of gnu_field is not necessarily gnu_type |
| so the MULT_EXPR node built above may not be marked by |
| the call to create_type_decl below. */ |
| MARK_VISITED (DECL_FIELD_OFFSET (gnu_field)); |
| } |
| } |
| |
| if (Is_Atomic_Or_VFA (gnat_entity)) |
| check_ok_for_atomic_type (gnu_type, gnat_entity, false); |
| |
| /* If this is not an unconstrained array type, set some flags. */ |
| if (TREE_CODE (gnu_type) != UNCONSTRAINED_ARRAY_TYPE) |
| { |
| /* Record the property that objects of tagged types are guaranteed to |
| be properly aligned. This is necessary because conversions to the |
| class-wide type are translated into conversions to the root type, |
| which can be less aligned than some of its derived types. */ |
| if (Is_Tagged_Type (gnat_entity) |
| || Is_Class_Wide_Equivalent_Type (gnat_entity)) |
| TYPE_ALIGN_OK (gnu_type) = 1; |
| |
| /* Record whether the type is passed by reference. */ |
| if (Is_By_Reference_Type (gnat_entity) && !VOID_TYPE_P (gnu_type)) |
| TYPE_BY_REFERENCE_P (gnu_type) = 1; |
| |
| /* Record whether an alignment clause was specified. */ |
| if (Present (Alignment_Clause (gnat_entity))) |
| TYPE_USER_ALIGN (gnu_type) = 1; |
| |
| /* Record whether a pragma Universal_Aliasing was specified. */ |
| if (Universal_Aliasing (gnat_entity) && !TYPE_IS_DUMMY_P (gnu_type)) |
| TYPE_UNIVERSAL_ALIASING_P (gnu_type) = 1; |
| |
| /* If it is passed by reference, force BLKmode to ensure that |
| objects of this type will always be put in memory. */ |
| if (AGGREGATE_TYPE_P (gnu_type) && TYPE_BY_REFERENCE_P (gnu_type)) |
| SET_TYPE_MODE (gnu_type, BLKmode); |
| } |
| |
| /* If this is a derived type, relate its alias set to that of its parent |
| to avoid troubles when a call to an inherited primitive is inlined in |
| a context where a derived object is accessed. The inlined code works |
| on the parent view so the resulting code may access the same object |
| using both the parent and the derived alias sets, which thus have to |
| conflict. As the same issue arises with component references, the |
| parent alias set also has to conflict with composite types enclosing |
| derived components. For instance, if we have: |
| |
| type D is new T; |
| type R is record |
| Component : D; |
| end record; |
| |
| we want T to conflict with both D and R, in addition to R being a |
| superset of D by record/component construction. |
| |
| One way to achieve this is to perform an alias set copy from the |
| parent to the derived type. This is not quite appropriate, though, |
| as we don't want separate derived types to conflict with each other: |
| |
| type I1 is new Integer; |
| type I2 is new Integer; |
| |
| We want I1 and I2 to both conflict with Integer but we do not want |
| I1 to conflict with I2, and an alias set copy on derivation would |
| have that effect. |
| |
| The option chosen is to make the alias set of the derived type a |
| superset of that of its parent type. It trivially fulfills the |
| simple requirement for the Integer derivation example above, and |
| the component case as well by superset transitivity: |
| |
| superset superset |
| R ----------> D ----------> T |
| |
| However, for composite types, conversions between derived types are |
| translated into VIEW_CONVERT_EXPRs so a sequence like: |
| |
| type Comp1 is new Comp; |
| type Comp2 is new Comp; |
| procedure Proc (C : Comp1); |
| |
| C : Comp2; |
| Proc (Comp1 (C)); |
| |
| is translated into: |
| |
| C : Comp2; |
| Proc ((Comp1 &) &VIEW_CONVERT_EXPR <Comp1> (C)); |
| |
| and gimplified into: |
| |
| C : Comp2; |
| Comp1 *C.0; |
| C.0 = (Comp1 *) &C; |
| Proc (C.0); |
| |
| i.e. generates code involving type punning. Therefore, Comp1 needs |
| to conflict with Comp2 and an alias set copy is required. |
| |
| The language rules ensure the parent type is already frozen here. */ |
| if (kind != E_Subprogram_Type |
| && Is_Derived_Type (gnat_entity) |
| && !type_annotate_only) |
| { |
| Entity_Id gnat_parent_type = Underlying_Type (Etype (gnat_entity)); |
| /* For constrained packed array subtypes, the implementation type is |
| used instead of the nominal type. */ |
| if (kind == E_Array_Subtype |
| && Is_Constrained (gnat_entity) |
| && Present (Packed_Array_Impl_Type (gnat_parent_type))) |
| gnat_parent_type = Packed_Array_Impl_Type (gnat_parent_type); |
| relate_alias_sets (gnu_type, gnat_to_gnu_type (gnat_parent_type), |
| Is_Composite_Type (gnat_entity) |
| ? ALIAS_SET_COPY : ALIAS_SET_SUPERSET); |
| } |
| |
| /* Finally get to the appropriate variant, except for the implementation |
| type of a packed array because the GNU type might be further adjusted |
| when the original array type is itself processed. */ |
| if (Treat_As_Volatile (gnat_entity) |
| && !Is_Packed_Array_Impl_Type (gnat_entity)) |
| { |
| const int quals |
| = TYPE_QUAL_VOLATILE |
| | (Is_Atomic_Or_VFA (gnat_entity) ? TYPE_QUAL_ATOMIC : 0); |
| gnu_type = change_qualified_type (gnu_type, quals); |
| } |
| |
| /* If we already made a decl, just set the type, otherwise create it. */ |
| if (gnu_decl) |
| { |
| TREE_TYPE (gnu_decl) = gnu_type; |
| TYPE_STUB_DECL (gnu_type) = gnu_decl; |
| } |
| else |
| gnu_decl = create_type_decl (gnu_entity_name, gnu_type, artificial_p, |
| debug_info_p, gnat_entity); |
| } |
| |
| /* Otherwise, for a type reusing an existing DECL, back-annotate values. */ |
| else if (is_type |
| && !TYPE_IS_DUMMY_P (TREE_TYPE (gnu_decl)) |
| && Present (gnat_annotate_type)) |
| { |
| if (Unknown_Alignment (gnat_entity)) |
| Set_Alignment (gnat_entity, Alignment (gnat_annotate_type)); |
| if (Unknown_Esize (gnat_entity)) |
| Set_Esize (gnat_entity, Esize (gnat_annotate_type)); |
| if (Unknown_RM_Size (gnat_entity)) |
| Set_RM_Size (gnat_entity, RM_Size (gnat_annotate_type)); |
| } |
| |
| /* If we haven't already, associate the ..._DECL node that we just made with |
| the input GNAT entity node. */ |
| if (!saved) |
| save_gnu_tree (gnat_entity, gnu_decl, false); |
| |
| /* Now we are sure gnat_entity has a corresponding ..._DECL node, |
| eliminate as many deferred computations as possible. */ |
| process_deferred_decl_context (false); |
| |
| /* If this is an enumeration or floating-point type, we were not able to set |
| the bounds since they refer to the type. These are always static. */ |
| if ((kind == E_Enumeration_Type && Present (First_Literal (gnat_entity))) |
| || (kind == E_Floating_Point_Type)) |
| { |
| tree gnu_scalar_type = gnu_type; |
| tree gnu_low_bound, gnu_high_bound; |
| |
| /* If this is a padded type, we need to use the underlying type. */ |
| if (TYPE_IS_PADDING_P (gnu_scalar_type)) |
| gnu_scalar_type = TREE_TYPE (TYPE_FIELDS (gnu_scalar_type)); |
| |
| /* If this is a floating point type and we haven't set a floating |
| point type yet, use this in the evaluation of the bounds. */ |
| if (!longest_float_type_node && kind == E_Floating_Point_Type) |
| longest_float_type_node = gnu_scalar_type; |
| |
| gnu_low_bound = gnat_to_gnu (Type_Low_Bound (gnat_entity)); |
| gnu_high_bound = gnat_to_gnu (Type_High_Bound (gnat_entity)); |
| |
| if (kind == E_Enumeration_Type) |
| { |
| /* Enumeration types have specific RM bounds. */ |
| SET_TYPE_RM_MIN_VALUE (gnu_scalar_type, gnu_low_bound); |
| SET_TYPE_RM_MAX_VALUE (gnu_scalar_type, gnu_high_bound); |
| } |
| else |
| { |
| /* Floating-point types don't have specific RM bounds. */ |
| TYPE_GCC_MIN_VALUE (gnu_scalar_type) = gnu_low_bound; |
| TYPE_GCC_MAX_VALUE (gnu_scalar_type) = gnu_high_bound; |
| } |
| } |
| |
| /* If we deferred processing of incomplete types, re-enable it. If there |
| were no other disables and we have deferred types to process, do so. */ |
| if (this_deferred |
| && --defer_incomplete_level == 0 |
| && defer_incomplete_list) |
| { |
| struct incomplete *p, *next; |
| |
| /* We are back to level 0 for the deferring of incomplete types. |
| But processing these incomplete types below may itself require |
| deferring, so preserve what we have and restart from scratch. */ |
| p = defer_incomplete_list; |
| defer_incomplete_list = NULL; |
| |
| for (; p; p = next) |
| { |
| next = p->next; |
| |
| if (p->old_type) |
| update_pointer_to (TYPE_MAIN_VARIANT (p->old_type), |
| gnat_to_gnu_type (p->full_type)); |
| free (p); |
| } |
| } |
| |
| /* If we are not defining this type, see if it's on one of the lists of |
| incomplete types. If so, handle the list entry now. */ |
| if (is_type && !definition) |
| { |
| struct incomplete *p; |
| |
| for (p = defer_incomplete_list; p; p = p->next) |
| if (p->old_type && p->full_type == gnat_entity) |
| { |
| update_pointer_to (TYPE_MAIN_VARIANT (p->old_type), |
| TREE_TYPE (gnu_decl)); |
| p->old_type = NULL_TREE; |
| } |
| |
| for (p = defer_limited_with_list; p; p = p->next) |
| if (p->old_type |
| && (Non_Limited_View (p->full_type) == gnat_entity |
| || Full_View (p->full_type) == gnat_entity)) |
| { |
| update_pointer_to (TYPE_MAIN_VARIANT (p->old_type), |
| TREE_TYPE (gnu_decl)); |
| if (TYPE_DUMMY_IN_PROFILE_P (p->old_type)) |
| update_profiles_with (p->old_type); |
| p->old_type = NULL_TREE; |
| } |
| } |
| |
| if (this_global) |
| force_global--; |
| |
| /* If this is a packed array type whose original array type is itself |
| an Itype without freeze node, make sure the latter is processed. */ |
| if (Is_Packed_Array_Impl_Type (gnat_entity) |
| && Is_Itype (Original_Array_Type (gnat_entity)) |
| && No (Freeze_Node (Original_Array_Type (gnat_entity))) |
| && !present_gnu_tree (Original_Array_Type (gnat_entity))) |
| gnat_to_gnu_entity (Original_Array_Type (gnat_entity), NULL_TREE, false); |
| |
| return gnu_decl; |
| } |
| |
| /* Similar, but if the returned value is a COMPONENT_REF, return the |
| FIELD_DECL. */ |
| |
| tree |
| gnat_to_gnu_field_decl (Entity_Id gnat_entity) |
| { |
| tree gnu_field = gnat_to_gnu_entity (gnat_entity, NULL_TREE, false); |
| |
| if (TREE_CODE (gnu_field) == COMPONENT_REF) |
| gnu_field = TREE_OPERAND (gnu_field, 1); |
| |
| return gnu_field; |
| } |
| |
| /* Similar, but GNAT_ENTITY is assumed to refer to a GNAT type. Return |
| the GCC type corresponding to that entity. */ |
| |
| tree |
| gnat_to_gnu_type (Entity_Id gnat_entity) |
| { |
| tree gnu_decl; |
| |
| /* The back end never attempts to annotate generic types. */ |
| if (Is_Generic_Type (gnat_entity) && type_annotate_only) |
| return void_type_node; |
| |
| gnu_decl = gnat_to_gnu_entity (gnat_entity, NULL_TREE, false); |
| gcc_assert (TREE_CODE (gnu_decl) == TYPE_DECL); |
| |
| return TREE_TYPE (gnu_decl); |
| } |
| |
| /* Similar, but GNAT_ENTITY is assumed to refer to a GNAT type. Return |
| the unpadded version of the GCC type corresponding to that entity. */ |
| |
| tree |
| get_unpadded_type (Entity_Id gnat_entity) |
| { |
| tree type = gnat_to_gnu_type (gnat_entity); |
| |
| if (TYPE_IS_PADDING_P (type)) |
| type = TREE_TYPE (TYPE_FIELDS (type)); |
| |
| return type; |
| } |
| |
| /* Return whether the E_Subprogram_Type/E_Function/E_Procedure GNAT_ENTITY is |
| a C++ imported method or equivalent. |
| |
| We use the predicate to find out whether we need to use METHOD_TYPE instead |
| of FUNCTION_TYPE for GNAT_ENTITY for the sake compatibility with C++. This |
| in turn determines whether the "thiscall" calling convention is used by the |
| back-end for GNAT_ENTITY on 32-bit x86/Windows. */ |
| |
| static bool |
| is_cplusplus_method (Entity_Id gnat_entity) |
| { |
| /* A constructor is a method on the C++ side. We deal with it now because |
| it is declared without the 'this' parameter in the sources and, although |
| the front-end will create a version with the 'this' parameter for code |
| generation purposes, we want to return true for both versions. */ |
| if (Is_Constructor (gnat_entity)) |
| return true; |
| |
| /* Check that the subprogram has C++ convention. */ |
| if (Convention (gnat_entity) != Convention_CPP) |
| return false; |
| |
| /* And that the type of the first parameter (indirectly) has it too, but |
| we make an exception for Interfaces because they need not be imported. */ |
| Entity_Id gnat_first = First_Formal (gnat_entity); |
| if (No (gnat_first)) |
| return false; |
| Entity_Id gnat_type = Etype (gnat_first); |
| if (Is_Access_Type (gnat_type)) |
| gnat_type = Directly_Designated_Type (gnat_type); |
| if (Convention (gnat_type) != Convention_CPP && !Is_Interface (gnat_type)) |
| return false; |
| |
| /* This is the main case: a C++ virtual method imported as a primitive |
| operation of a tagged type. */ |
| if (Is_Dispatching_Operation (gnat_entity)) |
| return true; |
| |
| /* This is set on the E_Subprogram_Type built for a dispatching call. */ |
| if (Is_Dispatch_Table_Entity (gnat_entity)) |
| return true; |
| |
| /* A thunk needs to be handled like its associated primitive operation. */ |
| if (Is_Subprogram (gnat_entity) && Is_Thunk (gnat_entity)) |
| return true; |
| |
| /* Now on to the annoying case: a C++ non-virtual method, imported either |
| as a non-primitive operation of a tagged type or as a primitive operation |
| of an untagged type. We cannot reliably differentiate these cases from |
| their static member or regular function equivalents in Ada, so we ask |
| the C++ side through the mangled name of the function, as the implicit |
| 'this' parameter is not encoded in the mangled name of a method. */ |
| if (Is_Subprogram (gnat_entity) && Present (Interface_Name (gnat_entity))) |
| { |
| String_Pointer sp = { NULL, NULL }; |
| Get_External_Name (gnat_entity, false, sp); |
| |
| void *mem; |
| struct demangle_component *cmp |
| = cplus_demangle_v3_components (Name_Buffer, |
| DMGL_GNU_V3 |
| | DMGL_TYPES |
| | DMGL_PARAMS |
| | DMGL_RET_DROP, |
| &mem); |
| if (!cmp) |
| return false; |
| |
| /* We need to release MEM once we have a successful demangling. */ |
| bool ret = false; |
| |
| if (cmp->type == DEMANGLE_COMPONENT_TYPED_NAME |
| && cmp->u.s_binary.right->type == DEMANGLE_COMPONENT_FUNCTION_TYPE |
| && (cmp = cmp->u.s_binary.right->u.s_binary.right) != NULL |
| && cmp->type == DEMANGLE_COMPONENT_ARGLIST) |
| { |
| /* Make sure there is at least one parameter in C++ too. */ |
| if (cmp->u.s_binary.left) |
| { |
| unsigned int n_ada_args = 0; |
| do { |
| n_ada_args++; |
| gnat_first = Next_Formal (gnat_first); |
| } while (Present (gnat_first)); |
| |
| unsigned int n_cpp_args = 0; |
| do { |
| n_cpp_args++; |
| cmp = cmp->u.s_binary.right; |
| } while (cmp); |
| |
| if (n_cpp_args < n_ada_args) |
| ret = true; |
| } |
| else |
| ret = true; |
| } |
| |
| free (mem); |
| |
| return ret; |
| } |
| |
| return false; |
| } |
| |
| /* Return the inlining status of the GNAT subprogram SUBPROG. */ |
| |
| static enum inline_status_t |
| inline_status_for_subprog (Entity_Id subprog) |
| { |
| if (Has_Pragma_No_Inline (subprog)) |
| return is_suppressed; |
| |
| if (Has_Pragma_Inline_Always (subprog)) |
| return is_required; |
| |
| if (Is_Inlined (subprog)) |
| { |
| tree gnu_type; |
| |
| /* This is a kludge to work around a pass ordering issue: for small |
| record types with many components, i.e. typically bit-fields, the |
| initialization routine can contain many assignments that will be |
| merged by the GIMPLE store merging pass. But this pass runs very |
| late in the pipeline, in particular after the inlining decisions |
| are made, so the inlining heuristics cannot take its outcome into |
| account. Therefore, we optimistically override the heuristics for |
| the initialization routine in this case. */ |
| if (Is_Init_Proc (subprog) |
| && flag_store_merging |
| && Is_Record_Type (Etype (First_Formal (subprog))) |
| && (gnu_type = gnat_to_gnu_type (Etype (First_Formal (subprog)))) |
| && !TYPE_IS_BY_REFERENCE_P (gnu_type) |
| && tree_fits_uhwi_p (TYPE_SIZE (gnu_type)) |
| && compare_tree_int (TYPE_SIZE (gnu_type), MAX_FIXED_MODE_SIZE) <= 0) |
| return is_prescribed; |
| |
| return is_requested; |
| } |
| |
| return is_default; |
| } |
| |
| /* Finalize the processing of From_Limited_With incomplete types. */ |
| |
| void |
| finalize_from_limited_with (void) |
| { |
| struct incomplete *p, *next; |
| |
| p = defer_limited_with_list; |
| defer_limited_with_list = NULL; |
| |
| for (; p; p = next) |
| { |
| next = p->next; |
| |
| if (p->old_type) |
| { |
| update_pointer_to (TYPE_MAIN_VARIANT (p->old_type), |
| gnat_to_gnu_type (p->full_type)); |
| if (TYPE_DUMMY_IN_PROFILE_P (p->old_type)) |
| update_profiles_with (p->old_type); |
| } |
| |
| free (p); |
| } |
| } |
| |
| /* Return the equivalent type to be used for GNAT_ENTITY, if it's a kind |
| of type (such E_Task_Type) that has a different type which Gigi uses |
| for its representation. If the type does not have a special type for |
| its representation, return GNAT_ENTITY. */ |
| |
| Entity_Id |
| Gigi_Equivalent_Type (Entity_Id gnat_entity) |
| { |
| Entity_Id gnat_equiv = gnat_entity; |
| |
| if (No (gnat_entity)) |
| return gnat_entity; |
| |
| switch (Ekind (gnat_entity)) |
| { |
| case E_Class_Wide_Subtype: |
| if (Present (Equivalent_Type (gnat_entity))) |
| gnat_equiv = Equivalent_Type (gnat_entity); |
| break; |
| |
| case E_Access_Protected_Subprogram_Type: |
| case E_Anonymous_Access_Protected_Subprogram_Type: |
| if (Present (Equivalent_Type (gnat_entity))) |
| gnat_equiv = Equivalent_Type (gnat_entity); |
| break; |
| |
| case E_Class_Wide_Type: |
| gnat_equiv = Root_Type (gnat_entity); |
| break; |
| |
| case E_Protected_Type: |
| case E_Protected_Subtype: |
| case E_Task_Type: |
| case E_Task_Subtype: |
| if (Present (Corresponding_Record_Type (gnat_entity))) |
| gnat_equiv = Corresponding_Record_Type (gnat_entity); |
| break; |
| |
| default: |
| break; |
| } |
| |
| return gnat_equiv; |
| } |
| |
| /* Return a GCC tree for a type corresponding to the component type of the |
| array type or subtype GNAT_ARRAY. DEFINITION is true if this component |
| is for an array being defined. DEBUG_INFO_P is true if we need to write |
| debug information for other types that we may create in the process. */ |
| |
| static tree |
| gnat_to_gnu_component_type (Entity_Id gnat_array, bool definition, |
| bool debug_info_p) |
| { |
| const Entity_Id gnat_type = Component_Type (gnat_array); |
| tree gnu_type = gnat_to_gnu_type (gnat_type); |
| bool has_packed_components = Is_Bit_Packed_Array (gnat_array); |
| tree gnu_comp_size; |
| unsigned int max_align; |
| |
| /* If an alignment is specified, use it as a cap on the component type |
| so that it can be honored for the whole type. But ignore it for the |
| original type of packed array types. */ |
| if (No (Packed_Array_Impl_Type (gnat_array)) |
| && Known_Alignment (gnat_array)) |
| max_align = validate_alignment (Alignment (gnat_array), gnat_array, 0); |
| else |
| max_align = 0; |
| |
| /* Try to get a packable form of the component if needed. */ |
| if ((Is_Packed (gnat_array) || Has_Component_Size_Clause (gnat_array)) |
| && !Has_Aliased_Components (gnat_array) |
| && !Strict_Alignment (gnat_type) |
| && !has_packed_components |
| && RECORD_OR_UNION_TYPE_P (gnu_type) |
| && !TYPE_FAT_POINTER_P (gnu_type) |
| && tree_fits_uhwi_p (TYPE_SIZE (gnu_type))) |
| { |
| gnu_type = make_packable_type (gnu_type, false, max_align); |
| has_packed_components = true; |
| } |
| |
| /* Get and validate any specified Component_Size. */ |
| gnu_comp_size |
| = validate_size (Component_Size (gnat_array), gnu_type, gnat_array, |
| has_packed_components ? TYPE_DECL : VAR_DECL, |
| true, Has_Component_Size_Clause (gnat_array)); |
| |
| /* If the component type is a RECORD_TYPE that has a self-referential size, |
| then use the maximum size for the component size. */ |
| if (!gnu_comp_size |
| && TREE_CODE (gnu_type) == RECORD_TYPE |
| && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type))) |
| gnu_comp_size = max_size (TYPE_SIZE (gnu_type), true); |
| |
| /* If the array has aliased components and the component size is zero, force |
| the unit size to ensure that the components have distinct addresses. */ |
| if (!gnu_comp_size |
| && Has_Aliased_Components (gnat_array) |
| && integer_zerop (TYPE_SIZE (gnu_type))) |
| gnu_comp_size = bitsize_unit_node; |
| |
| /* Honor the component size. This is not needed for bit-packed arrays. */ |
| if (gnu_comp_size && !Is_Bit_Packed_Array (gnat_array)) |
| { |
| tree orig_type = gnu_type; |
| |
| gnu_type = make_type_from_size (gnu_type, gnu_comp_size, false); |
| if (max_align > 0 && TYPE_ALIGN (gnu_type) > max_align) |
| gnu_type = orig_type; |
| else |
| orig_type = gnu_type; |
| |
| gnu_type = maybe_pad_type (gnu_type, gnu_comp_size, 0, gnat_array, |
| true, false, definition, true); |
| |
| /* If a padding record was made, declare it now since it will never be |
| declared otherwise. This is necessary to ensure that its subtrees |
| are properly marked. */ |
| if (gnu_type != orig_type && !DECL_P (TYPE_NAME (gnu_type))) |
| create_type_decl (TYPE_NAME (gnu_type), gnu_type, true, debug_info_p, |
| gnat_array); |
| } |
| |
| /* This is a very special case where the array has aliased components and the |
| component size might be zero at run time. As explained above, we force at |
| least the unit size but we don't want to build a distinct padding type for |
| each invocation (they are not canonicalized if they have variable size) so |
| we cache this special padding type as TYPE_PADDING_FOR_COMPONENT. */ |
| else if (Has_Aliased_Components (gnat_array) |
| && TREE_CODE (gnu_type) == ARRAY_TYPE |
| && !TREE_CONSTANT (TYPE_SIZE (gnu_type))) |
| { |
| if (TYPE_PADDING_FOR_COMPONENT (gnu_type)) |
| gnu_type = TYPE_PADDING_FOR_COMPONENT (gnu_type); |
| else |
| { |
| gnu_comp_size |
| = size_binop (MAX_EXPR, TYPE_SIZE (gnu_type), bitsize_unit_node); |
| TYPE_PADDING_FOR_COMPONENT (gnu_type) |
| = maybe_pad_type (gnu_type, gnu_comp_size, 0, gnat_array, |
| true, false, definition, true); |
| gnu_type = TYPE_PADDING_FOR_COMPONENT (gnu_type); |
| create_type_decl (TYPE_NAME (gnu_type), gnu_type, true, debug_info_p, |
| gnat_array); |
| } |
| } |
| |
| if (Has_Atomic_Components (gnat_array) || Is_Atomic_Or_VFA (gnat_type)) |
| check_ok_for_atomic_type (gnu_type, gnat_array, true); |
| |
| /* If the component type is a padded type made for a non-bit-packed array |
| of scalars with reverse storage order, we need to propagate the reverse |
| storage order to the padding type since it is the innermost enclosing |
| aggregate type around the scalar. */ |
| if (TYPE_IS_PADDING_P (gnu_type) |
| && Reverse_Storage_Order (gnat_array) |
| && !Is_Bit_Packed_Array (gnat_array) |
| && Is_Scalar_Type (gnat_type)) |
| gnu_type = set_reverse_storage_order_on_pad_type (gnu_type); |
| |
| if (Has_Volatile_Components (gnat_array)) |
| { |
| const int quals |
| = TYPE_QUAL_VOLATILE |
| | (Has_Atomic_Components (gnat_array) ? TYPE_QUAL_ATOMIC : 0); |
| gnu_type = change_qualified_type (gnu_type, quals); |
| } |
| |
| return gnu_type; |
| } |
| |
| /* Return whether TYPE requires that formal parameters of TYPE be initialized |
| when they are Out parameters passed by copy. |
| |
| This just implements the set of conditions listed in RM 6.4.1(12). */ |
| |
| static bool |
| type_requires_init_of_formal (Entity_Id type) |
| { |
| type = Underlying_Type (type); |
| |
| if (Is_Access_Type (type)) |
| return true; |
| |
| if (Is_Scalar_Type (type)) |
| return Has_Default_Aspect (type); |
| |
| if (Is_Array_Type (type)) |
| return Has_Default_Aspect (type) |
| || type_requires_init_of_formal (Component_Type (type)); |
| |
| if (Is_Record_Type (type)) |
| for (Entity_Id field = First_Entity (type); |
| Present (field); |
| field = Next_Entity (field)) |
| { |
| if (Ekind (field) == E_Discriminant && !Is_Unchecked_Union (type)) |
| return true; |
| |
| if (Ekind (field) == E_Component |
| && (Present (Expression (Parent (field))) |
| || type_requires_init_of_formal (Etype (field)))) |
| return true; |
| } |
| |
| return false; |
| } |
| |
| /* Return a GCC tree for a parameter corresponding to GNAT_PARAM, to be placed |
| in the parameter list of GNAT_SUBPROG. GNU_PARAM_TYPE is the GCC tree for |
| the type of the parameter. FIRST is true if this is the first parameter in |
| the list of GNAT_SUBPROG. Also set CICO to true if the parameter must use |
| the copy-in copy-out implementation mechanism. |
| |
| The returned tree is a PARM_DECL, except for the cases where no parameter |
| needs to be actually passed to the subprogram; the type of this "shadow" |
| parameter is then returned instead. */ |
| |
| static tree |
| gnat_to_gnu_param (Entity_Id gnat_param, tree gnu_param_type, bool first, |
| Entity_Id gnat_subprog, bool *cico) |
| { |
| Mechanism_Type mech = Mechanism (gnat_param); |
| tree gnu_param_name = get_entity_name (gnat_param); |
| bool foreign = Has_Foreign_Convention (gnat_subprog); |
| bool in_param = (Ekind (gnat_param) == E_In_Parameter); |
| /* The parameter can be indirectly modified if its address is taken. */ |
| bool ro_param = in_param && !Address_Taken (gnat_param); |
| bool by_return = false, by_component_ptr = false; |
| bool by_ref = false; |
| bool restricted_aliasing_p = false; |
| location_t saved_location = input_location; |
| tree gnu_param; |
| |
| /* Make sure to use the proper SLOC for vector ABI warnings. */ |
| if (VECTOR_TYPE_P (gnu_param_type)) |
| Sloc_to_locus (Sloc (gnat_subprog), &input_location); |
| |
| /* Builtins are expanded inline and there is no real call sequence involved. |
| So the type expected by the underlying expander is always the type of the |
| argument "as is". */ |
| if (Convention (gnat_subprog) == Convention_Intrinsic |
| && Present (Interface_Name (gnat_subprog))) |
| mech = By_Copy; |
| |
| /* Handle the first parameter of a valued procedure specially: it's a copy |
| mechanism for which the parameter is never allocated. */ |
| else if (first && Is_Valued_Procedure (gnat_subprog)) |
| { |
| gcc_assert (Ekind (gnat_param) == E_Out_Parameter); |
| mech = By_Copy; |
| by_return = true; |
| } |
| |
| /* Or else, see if a Mechanism was supplied that forced this parameter |
| to be passed one way or another. */ |
| else if (mech == Default || mech == By_Copy || mech == By_Reference) |
| ; |
| |
| /* Positive mechanism means by copy for sufficiently small parameters. */ |
| else if (mech > 0) |
| { |
| if (TREE_CODE (gnu_param_type) == UNCONSTRAINED_ARRAY_TYPE |
| || TREE_CODE (TYPE_SIZE (gnu_param_type)) != INTEGER_CST |
| || compare_tree_int (TYPE_SIZE (gnu_param_type), mech) > 0) |
| mech = By_Reference; |
| else |
| mech = By_Copy; |
| } |
| |
| /* Otherwise, it's an unsupported mechanism so error out. */ |
| else |
| { |
| post_error ("unsupported mechanism for&", gnat_param); |
| mech = Default; |
| } |
| |
| /* If this is either a foreign function or if the underlying type won't |
| be passed by reference and is as aligned as the original type, strip |
| off possible padding type. */ |
| if (TYPE_IS_PADDING_P (gnu_param_type)) |
| { |
| tree unpadded_type = TREE_TYPE (TYPE_FIELDS (gnu_param_type)); |
| |
| if (foreign |
| || (!must_pass_by_ref (unpadded_type) |
| && mech != By_Reference |
| && (mech == By_Copy || !default_pass_by_ref (unpadded_type)) |
| && TYPE_ALIGN (unpadded_type) >= TYPE_ALIGN (gnu_param_type))) |
| gnu_param_type = unpadded_type; |
| } |
| |
| /* If this is a read-only parameter, make a variant of the type that is |
| read-only. ??? However, if this is a self-referential type, the type |
| can be very complex, so skip it for now. */ |
| if (ro_param && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_param_type))) |
| gnu_param_type = change_qualified_type (gnu_param_type, TYPE_QUAL_CONST); |
| |
| /* For foreign conventions, pass arrays as pointers to the element type. |
| First check for unconstrained array and get the underlying array. */ |
| if (foreign && TREE_CODE (gnu_param_type) == UNCONSTRAINED_ARRAY_TYPE) |
| gnu_param_type |
| = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_param_type)))); |
| |
| /* Arrays are passed as pointers to element type for foreign conventions. */ |
| if (foreign && mech != By_Copy && TREE_CODE (gnu_param_type) == ARRAY_TYPE) |
| { |
| /* Strip off any multi-dimensional entries, then strip |
| off the last array to get the component type. */ |
| while (TREE_CODE (TREE_TYPE (gnu_param_type)) == ARRAY_TYPE |
| && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_param_type))) |
| gnu_param_type = TREE_TYPE (gnu_param_type); |
| |
| gnu_param_type = TREE_TYPE (gnu_param_type); |
| |
| if (ro_param) |
| gnu_param_type |
| = change_qualified_type (gnu_param_type, TYPE_QUAL_CONST); |
| |
| gnu_param_type = build_pointer_type (gnu_param_type); |
| by_component_ptr = true; |
| } |
| |
| /* Fat pointers are passed as thin pointers for foreign conventions. */ |
| else if (foreign && TYPE_IS_FAT_POINTER_P (gnu_param_type)) |
| gnu_param_type |
| = make_type_from_size (gnu_param_type, size_int (POINTER_SIZE), 0); |
| |
| /* Use a pointer type for the "this" pointer of C++ constructors. */ |
| else if (Chars (gnat_param) == Name_uInit && Is_Constructor (gnat_subprog)) |
| { |
| gcc_assert (mech == By_Reference); |
| gnu_param_type = build_pointer_type (gnu_param_type); |
| by_ref = true; |
| } |
| |
| /* If we were requested or muss pass by reference, do so. |
| If we were requested to pass by copy, do so. |
| Otherwise, for foreign conventions, pass In Out or Out parameters |
| or aggregates by reference. For COBOL and Fortran, pass all |
| integer and FP types that way too. For Convention Ada, use |
| the standard Ada default. */ |
| else if (mech == By_Reference |
| || must_pass_by_ref (gnu_param_type) |
| || (mech != By_Copy |
| && ((foreign |
| && (!in_param || AGGREGATE_TYPE_P (gnu_param_type))) |
| || (foreign |
| && (Convention (gnat_subprog) == Convention_Fortran |
| || Convention (gnat_subprog) == Convention_COBOL) |
| && (INTEGRAL_TYPE_P (gnu_param_type) |
| || FLOAT_TYPE_P (gnu_param_type))) |
| || (!foreign |
| && default_pass_by_ref (gnu_param_type))))) |
| { |
| /* We take advantage of 6.2(12) by considering that references built for |
| parameters whose type isn't by-ref and for which the mechanism hasn't |
| been forced to by-ref allow only a restricted form of aliasing. */ |
| restricted_aliasing_p |
| = !TYPE_IS_BY_REFERENCE_P (gnu_param_type) && mech != By_Reference; |
| gnu_param_type = build_reference_type (gnu_param_type); |
| by_ref = true; |
| } |
| |
| /* Pass In Out or Out parameters using copy-in copy-out mechanism. */ |
| else if (!in_param) |
| *cico = true; |
| |
| input_location = saved_location; |
| |
| if (mech == By_Copy && (by_ref || by_component_ptr)) |
| post_error ("?cannot pass & by copy", gnat_param); |
| |
| /* If this is an Out parameter that isn't passed by reference and whose |
| type doesn't require the initialization of formals, we don't make a |
| PARM_DECL for it. Instead, it will be a VAR_DECL created when we |
| process the procedure, so just return its type here. Likewise for |
| the _Init parameter of an initialization procedure or the special |
| parameter of a valued procedure, never pass them in. */ |
| if (Ekind (gnat_param) == E_Out_Parameter |
| && !by_ref |
| && !by_component_ptr |
| && (!type_requires_init_of_formal (Etype (gnat_param)) |
| || Is_Init_Proc (gnat_subprog) |
| || by_return)) |
| return gnu_param_type; |
| |
| gnu_param = create_param_decl (gnu_param_name, gnu_param_type); |
| TREE_READONLY (gnu_param) = ro_param || by_ref || by_component_ptr; |
| DECL_BY_REF_P (gnu_param) = by_ref; |
| DECL_BY_COMPONENT_PTR_P (gnu_param) = by_component_ptr; |
| DECL_POINTS_TO_READONLY_P (gnu_param) |
| = (ro_param && (by_ref || by_component_ptr)); |
| DECL_CAN_NEVER_BE_NULL_P (gnu_param) = Can_Never_Be_Null (gnat_param); |
| DECL_RESTRICTED_ALIASING_P (gnu_param) = restricted_aliasing_p; |
| Sloc_to_locus (Sloc (gnat_param), &DECL_SOURCE_LOCATION (gnu_param)); |
| |
| /* If no Mechanism was specified, indicate what we're using, then |
| back-annotate it. */ |
| if (mech == Default) |
| mech = (by_ref || by_component_ptr) ? By_Reference : By_Copy; |
| |
| Set_Mechanism (gnat_param, mech); |
| return gnu_param; |
| } |
| |
| /* Associate GNAT_SUBPROG with GNU_TYPE, which must be a dummy type, so that |
| GNAT_SUBPROG is updated when GNU_TYPE is completed. |
| |
| Ada 2012 (AI05-019) says that freezing a subprogram does not always freeze |
| the corresponding profile, which means that, by the time the freeze node |
| of the subprogram is encountered, types involved in its profile may still |
| be not yet frozen. That's why we need to update GNAT_SUBPROG when we see |
| the freeze node of types involved in its profile, either types of formal |
| parameters or the return type. */ |
| |
| static void |
| associate_subprog_with_dummy_type (Entity_Id gnat_subprog, tree gnu_type) |
| { |
| gcc_assert (TYPE_IS_DUMMY_P (gnu_type)); |
| |
| struct tree_entity_vec_map in; |
| in.base.from = gnu_type; |
| struct tree_entity_vec_map **slot |
| = dummy_to_subprog_map->find_slot (&in, INSERT); |
| if (!*slot) |
| { |
| tree_entity_vec_map *e = ggc_alloc<tree_entity_vec_map> (); |
| e->base.from = gnu_type; |
| e->to = NULL; |
| *slot = e; |
| } |
| |
| /* Even if there is already a slot for GNU_TYPE, we need to set the flag |
| because the vector might have been just emptied by update_profiles_with. |
| This can happen when there are 2 freeze nodes associated with different |
| views of the same type; the type will be really complete only after the |
| second freeze node is encountered. */ |
| TYPE_DUMMY_IN_PROFILE_P (gnu_type) = 1; |
| |
| vec<Entity_Id, va_gc_atomic> *v = (*slot)->to; |
| |
| /* Make sure GNAT_SUBPROG is not associated twice with the same dummy type, |
| since this would mean updating twice its profile. */ |
| if (v) |
| { |
| const unsigned len = v->length (); |
| unsigned int l = 0, u = len; |
| |
| /* Entity_Id is a simple integer so we can implement a stable order on |
| the vector with an ordered insertion scheme and binary search. */ |
| while (l < u) |
| { |
| unsigned int m = (l + u) / 2; |
| int diff = (int) (*v)[m] - (int) gnat_subprog; |
| if (diff > 0) |
| u = m; |
| else if (diff < 0) |
| l = m + 1; |
| else |
| return; |
| } |
| |
| /* l == u and therefore is the insertion point. */ |
| vec_safe_insert (v, l, gnat_subprog); |
| } |
| else |
| vec_safe_push (v, gnat_subprog); |
| |
| (*slot)->to = v; |
| } |
| |
| /* Update the GCC tree previously built for the profile of GNAT_SUBPROG. */ |
| |
| static void |
| update_profile (Entity_Id gnat_subprog) |
| { |
| tree gnu_param_list; |
| tree gnu_type = gnat_to_gnu_subprog_type (gnat_subprog, true, |
| Needs_Debug_Info (gnat_subprog), |
| &gnu_param_list); |
| if (DECL_P (gnu_type)) |
| { |
| /* Builtins cannot have their address taken so we can reset them. */ |
| gcc_assert (fndecl_built_in_p (gnu_type)); |
| save_gnu_tree (gnat_subprog, NULL_TREE, false); |
| save_gnu_tree (gnat_subprog, gnu_type, false); |
| return; |
| } |
| |
| tree gnu_subprog = get_gnu_tree (gnat_subprog); |
| |
| TREE_TYPE (gnu_subprog) = gnu_type; |
| |
| /* If GNAT_SUBPROG is an actual subprogram, GNU_SUBPROG is a FUNCTION_DECL |
| and needs to be adjusted too. */ |
| if (Ekind (gnat_subprog) != E_Subprogram_Type) |
| { |
| tree gnu_entity_name = get_entity_name (gnat_subprog); |
| tree gnu_ext_name |
| = gnu_ext_name_for_subprog (gnat_subprog, gnu_entity_name); |
| |
| DECL_ARGUMENTS (gnu_subprog) = gnu_param_list; |
| finish_subprog_decl (gnu_subprog, gnu_ext_name, gnu_type); |
| } |
| } |
| |
| /* Update the GCC trees previously built for the profiles involving GNU_TYPE, |
| a dummy type which appears in profiles. */ |
| |
| void |
| update_profiles_with (tree gnu_type) |
| { |
| struct tree_entity_vec_map in; |
| in.base.from = gnu_type; |
| struct tree_entity_vec_map *e = dummy_to_subprog_map->find (&in); |
| gcc_assert (e); |
| vec<Entity_Id, va_gc_atomic> *v = e->to; |
| e->to = NULL; |
| |
| /* The flag needs to be reset before calling update_profile, in case |
| associate_subprog_with_dummy_type is again invoked on GNU_TYPE. */ |
| TYPE_DUMMY_IN_PROFILE_P (gnu_type) = 0; |
| |
| unsigned int i; |
| Entity_Id *iter; |
| FOR_EACH_VEC_ELT (*v, i, iter) |
| update_profile (*iter); |
| |
| vec_free (v); |
| } |
| |
| /* Return the GCC tree for GNAT_TYPE present in the profile of a subprogram. |
| |
| Ada 2012 (AI05-0151) says that incomplete types coming from a limited |
| context may now appear as parameter and result types. As a consequence, |
| we may need to defer their translation until after a freeze node is seen |
| or to the end of the current unit. We also aim at handling temporarily |
| incomplete types created by the usual delayed elaboration scheme. */ |
| |
| static tree |
| gnat_to_gnu_profile_type (Entity_Id gnat_type) |
| { |
| /* This is the same logic as the E_Access_Type case of gnat_to_gnu_entity |
| so the rationale is exposed in that place. These processings probably |
| ought to be merged at some point. */ |
| Entity_Id gnat_equiv = Gigi_Equivalent_Type (gnat_type); |
| const bool is_from_limited_with |
| = (Is_Incomplete_Type (gnat_equiv) |
| && From_Limited_With (gnat_equiv)); |
| Entity_Id gnat_full_direct_first |
| = (is_from_limited_with |
| ? Non_Limited_View (gnat_equiv) |
| : (Is_Incomplete_Or_Private_Type (gnat_equiv) |
| ? Full_View (gnat_equiv) : Empty)); |
| Entity_Id gnat_full_direct |
| = ((is_from_limited_with |
| && Present (gnat_full_direct_first) |
| && Is_Private_Type (gnat_full_direct_first)) |
| ? Full_View (gnat_full_direct_first) |
| : gnat_full_direct_first); |
| Entity_Id gnat_full = Gigi_Equivalent_Type (gnat_full_direct); |
| Entity_Id gnat_rep = Present (gnat_full) ? gnat_full : gnat_equiv; |
| const bool in_main_unit = In_Extended_Main_Code_Unit (gnat_rep); |
| tree gnu_type; |
| |
| if (Present (gnat_full) && present_gnu_tree (gnat_full)) |
| gnu_type = TREE_TYPE (get_gnu_tree (gnat_full)); |
| |
| else if (is_from_limited_with |
| && ((!in_main_unit |
| && !present_gnu_tree (gnat_equiv) |
| && Present (gnat_full) |
| && (Is_Record_Type (gnat_full) |
| || Is_Array_Type (gnat_full) |
| || Is_Access_Type (gnat_full))) |
| || (in_main_unit && Present (Freeze_Node (gnat_rep))))) |
| { |
| gnu_type = make_dummy_type (gnat_equiv); |
| |
| if (!in_main_unit) |
| { |
| struct incomplete *p = XNEW (struct incomplete); |
| |
| p->old_type = gnu_type; |
| p->full_type = gnat_equiv; |
| p->next = defer_limited_with_list; |
| defer_limited_with_list = p; |
| } |
| } |
| |
| else if (type_annotate_only && No (gnat_equiv)) |
| gnu_type = void_type_node; |
| |
| else |
| gnu_type = gnat_to_gnu_type (gnat_equiv); |
| |
| /* Access-to-unconstrained-array types need a special treatment. */ |
| if (Is_Array_Type (gnat_rep) && !Is_Constrained (gnat_rep)) |
| { |
| if (!TYPE_POINTER_TO (gnu_type)) |
| build_dummy_unc_pointer_types (gnat_equiv, gnu_type); |
| } |
| |
| return gnu_type; |
| } |
| |
| /* Return a GCC tree for a subprogram type corresponding to GNAT_SUBPROG. |
| DEFINITION is true if this is for a subprogram being defined. DEBUG_INFO_P |
| is true if we need to write debug information for other types that we may |
| create in the process. Also set PARAM_LIST to the list of parameters. |
| If GNAT_SUBPROG is bound to a GCC builtin, return the DECL for the builtin |
| directly instead of its type. */ |
| |
| static tree |
| gnat_to_gnu_subprog_type (Entity_Id gnat_subprog, bool definition, |
| bool debug_info_p, tree *param_list) |
| { |
| const Entity_Kind kind = Ekind (gnat_subprog); |
| const bool method_p = is_cplusplus_method (gnat_subprog); |
| Entity_Id gnat_return_type = Etype (gnat_subprog); |
| Entity_Id gnat_param; |
| tree gnu_type = present_gnu_tree (gnat_subprog) |
| ? TREE_TYPE (get_gnu_tree (gnat_subprog)) : NULL_TREE; |
| tree gnu_return_type; |
| tree gnu_param_type_list = NULL_TREE; |
| tree gnu_param_list = NULL_TREE; |
| /* Non-null for subprograms containing parameters passed by copy-in copy-out |
| (In Out or Out parameters not passed by reference), in which case it is |
| the list of nodes used to specify the values of the In Out/Out parameters |
| that are returned as a record upon procedure return. The TREE_PURPOSE of |
| an element of this list is a FIELD_DECL of the record and the TREE_VALUE |
| is the PARM_DECL corresponding to that field. This list will be saved in |
| the TYPE_CI_CO_LIST field of the FUNCTION_TYPE node we create. */ |
| tree gnu_cico_list = NULL_TREE; |
| tree gnu_cico_return_type = NULL_TREE; |
| /* Fields in return type of procedure with copy-in copy-out parameters. */ |
| tree gnu_field_list = NULL_TREE; |
| /* The semantics of "pure" in Ada essentially matches that of "const" |
| or "pure" in GCC. In particular, both properties are orthogonal |
| to the "nothrow" property if the EH circuitry is explicit in the |
| internal representation of the middle-end. If we are to completely |
| hide the EH circuitry from it, we need to declare that calls to pure |
| Ada subprograms that can throw have side effects since they can |
| trigger an "abnormal" transfer of control flow; therefore, they can |
| be neither "const" nor "pure" in the GCC sense. */ |
| bool const_flag = (Back_End_Exceptions () && Is_Pure (gnat_subprog)); |
| bool pure_flag = false; |
| bool return_by_direct_ref_p = false; |
| bool return_by_invisi_ref_p = false; |
| bool return_unconstrained_p = false; |
| bool incomplete_profile_p = false; |
| unsigned int num; |
| |
| /* Look into the return type and get its associated GCC tree if it is not |
| void, and then compute various flags for the subprogram type. But make |
| sure not to do this processing multiple times. */ |
| if (Ekind (gnat_return_type) == E_Void) |
| gnu_return_type = void_type_node; |
| |
| else if (gnu_type |
| && FUNC_OR_METHOD_TYPE_P (gnu_type) |
| && !TYPE_IS_DUMMY_P (TREE_TYPE (gnu_type))) |
| { |
| gnu_return_type = TREE_TYPE (gnu_type); |
| return_unconstrained_p = TYPE_RETURN_UNCONSTRAINED_P (gnu_type); |
| return_by_direct_ref_p = TYPE_RETURN_BY_DIRECT_REF_P (gnu_type); |
| return_by_invisi_ref_p = TREE_ADDRESSABLE (gnu_type); |
| } |
| |
| else |
| { |
| /* For foreign convention subprograms, return System.Address as void * |
| or equivalent. Note that this comprises GCC builtins. */ |
| if (Has_Foreign_Convention (gnat_subprog) |
| && Is_Descendant_Of_Address (Underlying_Type (gnat_return_type))) |
| gnu_return_type = ptr_type_node; |
| else |
| gnu_return_type = gnat_to_gnu_profile_type (gnat_return_type); |
| |
| /* If this function returns by reference, make the actual return type |
| the reference type and make a note of that. */ |
| if (Returns_By_Ref (gnat_subprog)) |
| { |
| gnu_return_type = build_reference_type (gnu_return_type); |
| return_by_direct_ref_p = true; |
| } |
| |
| /* If the return type is an unconstrained array type, the return value |
| will be allocated on the secondary stack so the actual return type |
| is the fat pointer type. */ |
| else if (TREE_CODE (gnu_return_type) == UNCONSTRAINED_ARRAY_TYPE) |
| { |
| gnu_return_type = TYPE_REFERENCE_TO (gnu_return_type); |
| return_unconstrained_p = true; |
| } |
| |
| /* This is the same unconstrained array case, but for a dummy type. */ |
| else if (TYPE_REFERENCE_TO (gnu_return_type) |
| && TYPE_IS_FAT_POINTER_P (TYPE_REFERENCE_TO (gnu_return_type))) |
| { |
| gnu_return_type = TYPE_REFERENCE_TO (gnu_return_type); |
| return_unconstrained_p = true; |
| } |
| |
| /* Likewise, if the return type requires a transient scope, the return |
| value will also be allocated on the secondary stack so the actual |
| return type is the reference type. */ |
| else if (Requires_Transient_Scope (gnat_return_type)) |
| { |
| gnu_return_type = build_reference_type (gnu_return_type); |
| return_unconstrained_p = true; |
| } |
| |
| /* If the Mechanism is By_Reference, ensure this function uses the |
| target's by-invisible-reference mechanism, which may not be the |
| same as above (e.g. it might be passing an extra parameter). */ |
| else if (kind == E_Function && Mechanism (gnat_subprog) == By_Reference) |
| return_by_invisi_ref_p = true; |
| |
| /* Likewise, if the return type is itself By_Reference. */ |
| else if (TYPE_IS_BY_REFERENCE_P (gnu_return_type)) |
| return_by_invisi_ref_p = true; |
| |
| /* If the type is a padded type and the underlying type would not be |
| passed by reference or the function has a foreign convention, return |
| the underlying type. */ |
| else if (TYPE_IS_PADDING_P (gnu_return_type) |
| && (!default_pass_by_ref |
| (TREE_TYPE (TYPE_FIELDS (gnu_return_type))) |
| || Has_Foreign_Convention (gnat_subprog))) |
| gnu_return_type = TREE_TYPE (TYPE_FIELDS (gnu_return_type)); |
| |
| /* If the return type is unconstrained, it must have a maximum size. |
| Use the padded type as the effective return type. And ensure the |
| function uses the target's by-invisible-reference mechanism to |
| avoid copying too much data when it returns. */ |
| if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_return_type))) |
| { |
| tree orig_type = gnu_return_type; |
| tree max_return_size = max_size (TYPE_SIZE (gnu_return_type), true); |
| |
| /* If the size overflows to 0, set it to an arbitrary positive |
| value so that assignments in the type are preserved. Their |
| actual size is independent of this positive value. */ |
| if (TREE_CODE (max_return_size) == INTEGER_CST |
| && TREE_OVERFLOW (max_return_size) |
| && integer_zerop (max_return_size)) |
| { |
| max_return_size = copy_node (bitsize_unit_node); |
| TREE_OVERFLOW (max_return_size) = 1; |
| } |
| |
| gnu_return_type = maybe_pad_type (gnu_return_type, max_return_size, |
| 0, gnat_subprog, false, false, |
| definition, true); |
| |
| /* Declare it now since it will never be declared otherwise. This |
| is necessary to ensure that its subtrees are properly marked. */ |
| if (gnu_return_type != orig_type |
| && !DECL_P (TYPE_NAME (gnu_return_type))) |
| create_type_decl (TYPE_NAME (gnu_return_type), gnu_return_type, |
| true, debug_info_p, gnat_subprog); |
| |
| return_by_invisi_ref_p = true; |
| } |
| |
| /* If the return type has a size that overflows, we usually cannot have |
| a function that returns that type. This usage doesn't really make |
| sense anyway, so issue an error here. */ |
| if (!return_by_invisi_ref_p |
| && TYPE_SIZE_UNIT (gnu_return_type) |
| && TREE_CODE (TYPE_SIZE_UNIT (gnu_return_type)) == INTEGER_CST |
| && !valid_constant_size_p (TYPE_SIZE_UNIT (gnu_return_type))) |
| { |
| post_error ("cannot return type whose size overflows", gnat_subprog); |
| gnu_return_type = copy_type (gnu_return_type); |
| TYPE_SIZE (gnu_return_type) = bitsize_zero_node; |
| TYPE_SIZE_UNIT (gnu_return_type) = size_zero_node; |
| } |
| |
| /* If the return type is incomplete, there are 2 cases: if the function |
| returns by reference, then the return type is only linked indirectly |
| in the profile, so the profile can be seen as complete since it need |
| not be further modified, only the reference types need be adjusted; |
| otherwise the profile is incomplete and need be adjusted too. */ |
| if (TYPE_IS_DUMMY_P (gnu_return_type)) |
| { |
| associate_subprog_with_dummy_type (gnat_subprog, gnu_return_type); |
| incomplete_profile_p = true; |
| } |
| |
| if (kind == E_Function) |
| Set_Mechanism (gnat_subprog, return_unconstrained_p |
| || return_by_direct_ref_p |
| || return_by_invisi_ref_p |
| ? By_Reference : By_Copy); |
| } |
| |
| /* A procedure (something that doesn't return anything) shouldn't be |
| considered const since there would be no reason for calling such a |
| subprogram. Note that procedures with Out (or In Out) parameters |
| have already been converted into a function with a return type. |
| Similarly, if the function returns an unconstrained type, then the |
| function will allocate the return value on the secondary stack and |
| thus calls to it cannot be CSE'ed, lest the stack be reclaimed. */ |
| if (VOID_TYPE_P (gnu_return_type) || return_unconstrained_p) |
| const_flag = false; |
| |
| /* Loop over the parameters and get their associated GCC tree. While doing |
| this, build a copy-in copy-out structure if we need one. */ |
| for (gnat_param = First_Formal_With_Extras (gnat_subprog), num = 0; |
| Present (gnat_param); |
| gnat_param = Next_Formal_With_Extras (gnat_param), num++) |
| { |
| const bool mech_is_by_ref |
| = Mechanism (gnat_param) == By_Reference |
| && !(num == 0 && Is_Valued_Procedure (gnat_subprog)); |
| tree gnu_param_name = get_entity_name (gnat_param); |
| tree gnu_param, gnu_param_type; |
| bool cico = false; |
| |
| /* Fetch an existing parameter with complete type and reuse it. But we |
| didn't save the CICO property so we can only do it for In parameters |
| or parameters passed by reference. */ |
| if ((Ekind (gnat_param) == E_In_Parameter || mech_is_by_ref) |
| && present_gnu_tree (gnat_param) |
| && (gnu_param = get_gnu_tree (gnat_param)) |
| && !TYPE_IS_DUMMY_P (TREE_TYPE (gnu_param))) |
| { |
| DECL_CHAIN (gnu_param) = NULL_TREE; |
| gnu_param_type = TREE_TYPE (gnu_param); |
| } |
| |
| /* Otherwise translate the parameter type and act accordingly. */ |
| else |
| { |
| Entity_Id gnat_param_type = Etype (gnat_param); |
| |
| /* For foreign convention subprograms, pass System.Address as void * |
| or equivalent. Note that this comprises GCC builtins. */ |
| if (Has_Foreign_Convention (gnat_subprog) |
| && Is_Descendant_Of_Address (Underlying_Type (gnat_param_type))) |
| gnu_param_type = ptr_type_node; |
| else |
| gnu_param_type = gnat_to_gnu_profile_type (gnat_param_type); |
| |
| /* If the parameter type is incomplete, there are 2 cases: if it is |
| passed by reference, then the type is only linked indirectly in |
| the profile, so the profile can be seen as complete since it need |
| not be further modified, only the reference type need be adjusted; |
| otherwise the profile is incomplete and need be adjusted too. */ |
| if (TYPE_IS_DUMMY_P (gnu_param_type)) |
| { |
| Node_Id gnat_decl; |
| |
| if (mech_is_by_ref |
| || (TYPE_REFERENCE_TO (gnu_param_type) |
| && TYPE_IS_FAT_POINTER_P |
| (TYPE_REFERENCE_TO (gnu_param_type))) |
| || TYPE_IS_BY_REFERENCE_P (gnu_param_type)) |
| { |
| gnu_param_type = build_reference_type (gnu_param_type); |
| gnu_param |
| = create_param_decl (gnu_param_name, gnu_param_type); |
| TREE_READONLY (gnu_param) = 1; |
| DECL_BY_REF_P (gnu_param) = 1; |
| DECL_POINTS_TO_READONLY_P (gnu_param) |
| = (Ekind (gnat_param) == E_In_Parameter |
| && !Address_Taken (gnat_param)); |
| Set_Mechanism (gnat_param, By_Reference); |
| Sloc_to_locus (Sloc (gnat_param), |
| &DECL_SOURCE_LOCATION (gnu_param)); |
| } |
| |
| /* ??? This is a kludge to support null procedures in spec taking |
| a parameter with an untagged incomplete type coming from a |
| limited context. The front-end creates a body without knowing |
| anything about the non-limited view, which is illegal Ada and |
| cannot be supported. Create a parameter with a fake type. */ |
| else if (kind == E_Procedure |
| && (gnat_decl = Parent (gnat_subprog)) |
| && Nkind (gnat_decl) == N_Procedure_Specification |
| && Null_Present (gnat_decl) |
| && Is_Incomplete_Type (gnat_param_type)) |
| gnu_param = create_param_decl (gnu_param_name, ptr_type_node); |
| |
| else |
| { |
| /* Build a minimal PARM_DECL without DECL_ARG_TYPE so that |
| Call_to_gnu will stop if it encounters the PARM_DECL. */ |
| gnu_param |
| = build_decl (input_location, PARM_DECL, gnu_param_name, |
| gnu_param_type); |
| associate_subprog_with_dummy_type (gnat_subprog, |
| gnu_param_type); |
| incomplete_profile_p = true; |
| } |
| } |
| |
| /* Otherwise build the parameter declaration normally. */ |
| else |
| { |
| gnu_param |
| = gnat_to_gnu_param (gnat_param, gnu_param_type, num == 0, |
| gnat_subprog, &cico); |
| |
| /* We are returned either a PARM_DECL or a type if no parameter |
| needs to be passed; in either case, adjust the type. */ |
| if (DECL_P (gnu_param)) |
| gnu_param_type = TREE_TYPE (gnu_param); |
| else |
| { |
| gnu_param_type = gnu_param; |
| gnu_param = NULL_TREE; |
| } |
| } |
| } |
| |
| /* If we have a GCC tree for the parameter, register it. */ |
| save_gnu_tree (gnat_param, NULL_TREE, false); |
| if (gnu_param) |
| { |
| gnu_param_type_list |
| = tree_cons (NULL_TREE, gnu_param_type, gnu_param_type_list); |
| DECL_CHAIN (gnu_param) = gnu_param_list; |
| gnu_param_list = gnu_param; |
| save_gnu_tree (gnat_param, gnu_param, false); |
| |
| /* A pure function in the Ada sense which takes an access parameter |
| may modify memory through it and thus need be considered neither |
| const nor pure in the GCC sense. Likewise it if takes a by-ref |
| In Out or Out parameter. But if it takes a by-ref In parameter, |
| then it may only read memory through it and can be considered |
| pure in the GCC sense. */ |
| if ((const_flag || pure_flag) |
| && (POINTER_TYPE_P (gnu_param_type) |
| || TYPE_IS_FAT_POINTER_P (gnu_param_type))) |
| { |
| const_flag = false; |
| pure_flag = DECL_POINTS_TO_READONLY_P (gnu_param); |
| } |
| } |
| |
| /* If the parameter uses the copy-in copy-out mechanism, allocate a field |
| for it in the return type and register the association. */ |
| if (cico && !incomplete_profile_p) |
| { |
| if (!gnu_cico_list) |
| { |
| gnu_cico_return_type = make_node (RECORD_TYPE); |
| |
| /* If this is a function, we also need a field for the |
| return value to be placed. */ |
| if (!VOID_TYPE_P (gnu_return_type)) |
| { |
| tree gnu_field |
| = create_field_decl (get_identifier ("RETVAL"), |
| gnu_return_type, |
| gnu_cico_return_type, NULL_TREE, |
| NULL_TREE, 0, 0); |
| Sloc_to_locus (Sloc (gnat_subprog), |
| &DECL_SOURCE_LOCATION (gnu_field)); |
| gnu_field_list = gnu_field; |
| gnu_cico_list |
| = tree_cons (gnu_field, void_type_node, NULL_TREE); |
| } |
| |
| TYPE_NAME (gnu_cico_return_type) = get_identifier ("RETURN"); |
| /* Set a default alignment to speed up accesses. But we should |
| not increase the size of the structure too much, lest it does |
| not fit in return registers anymore. */ |
| SET_TYPE_ALIGN (gnu_cico_return_type, |
| get_mode_alignment (ptr_mode)); |
| } |
| |
| tree gnu_field |
| = create_field_decl (gnu_param_name, gnu_param_type, |
| gnu_cico_return_type, NULL_TREE, NULL_TREE, |
| 0, 0); |
| Sloc_to_locus (Sloc (gnat_param), |
| &DECL_SOURCE_LOCATION (gnu_field)); |
| DECL_CHAIN (gnu_field) = gnu_field_list; |
| gnu_field_list = gnu_field; |
| gnu_cico_list = tree_cons (gnu_field, gnu_param, gnu_cico_list); |
| } |
| } |
| |
| /* If the subprogram uses the copy-in copy-out mechanism, possibly adjust |
| and finish up the return type. */ |
| if (gnu_cico_list && !incomplete_profile_p) |
| { |
| /* If we have a CICO list but it has only one entry, we convert |
| this function into a function that returns this object. */ |
| if (list_length (gnu_cico_list) == 1) |
| gnu_cico_return_type = TREE_TYPE (TREE_PURPOSE (gnu_cico_list)); |
| |
| /* Do not finalize the return type if the subprogram is stubbed |
| since structures are incomplete for the back-end. */ |
| else if (Convention (gnat_subprog) != Convention_Stubbed) |
| { |
| finish_record_type (gnu_cico_return_type, nreverse (gnu_field_list), |
| 0, false); |
| |
| /* Try to promote the mode of the return type if it is passed |
| in registers, again to speed up accesses. */ |
| if (TYPE_MODE (gnu_cico_return_type) == BLKmode |
| && !targetm.calls.return_in_memory (gnu_cico_return_type, |
| NULL_TREE)) |
| { |
| unsigned int size |
| = TREE_INT_CST_LOW (TYPE_SIZE (gnu_cico_return_type)); |
| unsigned int i = BITS_PER_UNIT; |
| scalar_int_mode mode; |
| |
| while (i < size) |
| i <<= 1; |
| if (int_mode_for_size (i, 0).exists (&mode)) |
| { |
| SET_TYPE_MODE (gnu_cico_return_type, mode); |
| SET_TYPE_ALIGN (gnu_cico_return_type, |
| GET_MODE_ALIGNMENT (mode)); |
| TYPE_SIZE (gnu_cico_return_type) |
| = bitsize_int (GET_MODE_BITSIZE (mode)); |
| TYPE_SIZE_UNIT (gnu_cico_return_type) |
| = size_int (GET_MODE_SIZE (mode)); |
| } |
| } |
| |
| if (debug_info_p) |
| rest_of_record_type_compilation (gnu_cico_return_type); |
| } |
| |
| gnu_return_type = gnu_cico_return_type; |
| } |
| |
| /* The lists have been built in reverse. */ |
| gnu_param_type_list = nreverse (gnu_param_type_list); |
| gnu_param_type_list = chainon (gnu_param_type_list, void_list_node); |
| gnu_param_list = nreverse (gnu_param_list); |
| gnu_cico_list = nreverse (gnu_cico_list); |
| |
| /* Turn imported C++ constructors into their callable form as done in the |
| front-end, i.e. add the "this" pointer and void the return type. */ |
| if (method_p |
| && Is_Constructor (gnat_subprog) |
| && !VOID_TYPE_P (gnu_return_type)) |
| { |
| tree gnu_param_type |
| = build_pointer_type (gnat_to_gnu_profile_type (gnat_return_type)); |
| tree gnu_param_name = get_identifier (Get_Name_String (Name_uInit)); |
| tree gnu_param |
| = build_decl (input_location, PARM_DECL, gnu_param_name, |
| gnu_param_type); |
| gnu_param_type_list |
| = tree_cons (NULL_TREE, gnu_param_type, gnu_param_type_list); |
| DECL_CHAIN (gnu_param) = gnu_param_list; |
| gnu_param_list = gnu_param; |
| gnu_return_type = void_type_node; |
| } |
| |
| /* If the profile is incomplete, we only set the (temporary) return and |
| parameter types; otherwise, we build the full type. In either case, |
| we reuse an already existing GCC tree that we built previously here. */ |
| if (incomplete_profile_p) |
| { |
| if (gnu_type && FUNC_OR_METHOD_TYPE_P (gnu_type)) |
| ; |
| else |
| gnu_type = make_node (method_p ? METHOD_TYPE : FUNCTION_TYPE); |
| TREE_TYPE (gnu_type) = gnu_return_type; |
| TYPE_ARG_TYPES (gnu_type) = gnu_param_type_list; |
| TYPE_RETURN_UNCONSTRAINED_P (gnu_type) = return_unconstrained_p; |
| TYPE_RETURN_BY_DIRECT_REF_P (gnu_type) = return_by_direct_ref_p; |
| TREE_ADDRESSABLE (gnu_type) = return_by_invisi_ref_p; |
| } |
| else |
| { |
| if (gnu_type && FUNC_OR_METHOD_TYPE_P (gnu_type)) |
| { |
| TREE_TYPE (gnu_type) = gnu_return_type; |
| TYPE_ARG_TYPES (gnu_type) = gnu_param_type_list; |
| if (method_p) |
| { |
| tree gnu_basetype = TREE_TYPE (TREE_VALUE (gnu_param_type_list)); |
| TYPE_METHOD_BASETYPE (gnu_type) |
| = TYPE_MAIN_VARIANT (gnu_basetype); |
| } |
| TYPE_CI_CO_LIST (gnu_type) = gnu_cico_list; |
| TYPE_RETURN_UNCONSTRAINED_P (gnu_type) = return_unconstrained_p; |
| TYPE_RETURN_BY_DIRECT_REF_P (gnu_type) = return_by_direct_ref_p; |
| TREE_ADDRESSABLE (gnu_type) = return_by_invisi_ref_p; |
| TYPE_CANONICAL (gnu_type) = gnu_type; |
| layout_type (gnu_type); |
| } |
| else |
| { |
| if (method_p) |
| { |
| tree gnu_basetype = TREE_TYPE (TREE_VALUE (gnu_param_type_list)); |
| gnu_type |
| = build_method_type_directly (gnu_basetype, gnu_return_type, |
| TREE_CHAIN (gnu_param_type_list)); |
| } |
| else |
| gnu_type |
| = build_function_type (gnu_return_type, gnu_param_type_list); |
| |
| /* GNU_TYPE may be shared since GCC hashes types. Unshare it if it |
| has a different TYPE_CI_CO_LIST or flags. */ |
| if (!fntype_same_flags_p (gnu_type, gnu_cico_list, |
| return_unconstrained_p, |
| return_by_direct_ref_p, |
| return_by_invisi_ref_p)) |
| { |
| gnu_type = copy_type (gnu_type); |
| TYPE_CI_CO_LIST (gnu_type) = gnu_cico_list; |
| TYPE_RETURN_UNCONSTRAINED_P (gnu_type) = return_unconstrained_p; |
| TYPE_RETURN_BY_DIRECT_REF_P (gnu_type) = return_by_direct_ref_p; |
| TREE_ADDRESSABLE (gnu_type) = return_by_invisi_ref_p; |
| } |
| } |
| |
| if (const_flag) |
| gnu_type = change_qualified_type (gnu_type, TYPE_QUAL_CONST); |
| |
| if (pure_flag) |
| gnu_type = change_qualified_type (gnu_type, TYPE_QUAL_RESTRICT); |
| |
| if (No_Return (gnat_subprog)) |
| gnu_type = change_qualified_type (gnu_type, TYPE_QUAL_VOLATILE); |
| |
| /* If this subprogram is expectedly bound to a GCC builtin, fetch the |
| corresponding DECL node and check the parameter association. */ |
| if (Convention (gnat_subprog) == Convention_Intrinsic |
| && Present (Interface_Name (gnat_subprog))) |
| { |
| tree gnu_ext_name = create_concat_name (gnat_subprog, NULL); |
| tree gnu_builtin_decl = builtin_decl_for (gnu_ext_name); |
| |
| /* If we have a builtin DECL for that function, use it. Check if |
| the profiles are compatible and warn if they are not. Note that |
| the checker is expected to post diagnostics in this case. */ |
| if (gnu_builtin_decl) |
| { |
| intrin_binding_t inb |
| = { gnat_subprog, gnu_type, TREE_TYPE (gnu_builtin_decl) }; |
| |
| if (!intrin_profiles_compatible_p (&inb)) |
| post_error |
| ("?profile of& doesn''t match the builtin it binds!", |
| gnat_subprog); |
| |
| return gnu_builtin_decl; |
| } |
| |
| /* Inability to find the builtin DECL most often indicates a genuine |
| mistake, but imports of unregistered intrinsics are sometimes used |
| on purpose to allow hooking in alternate bodies; we post a warning |
| conditioned on Wshadow in this case, to let developers be notified |
| on demand without risking false positives with common default sets |
| of options. */ |
| if (warn_shadow) |
| post_error ("?gcc intrinsic not found for&!", gnat_subprog); |
| } |
| } |
| |
| *param_list = gnu_param_list; |
| |
| return gnu_type; |
| } |
| |
| /* Return the external name for GNAT_SUBPROG given its entity name. */ |
| |
| static tree |
| gnu_ext_name_for_subprog (Entity_Id gnat_subprog, tree gnu_entity_name) |
| { |
| tree gnu_ext_name = create_concat_name (gnat_subprog, NULL); |
| |
| /* If there was no specified Interface_Name and the external and |
| internal names of the subprogram are the same, only use the |
| internal name to allow disambiguation of nested subprograms. */ |
| if (No (Interface_Name (gnat_subprog)) && gnu_ext_name == gnu_entity_name) |
| gnu_ext_name = NULL_TREE; |
| |
| return gnu_ext_name; |
| } |
| |
| /* Set TYPE_NONALIASED_COMPONENT on an array type built by means of |
| build_nonshared_array_type. */ |
| |
| static void |
| set_nonaliased_component_on_array_type (tree type) |
| { |
| TYPE_NONALIASED_COMPONENT (type) = 1; |
| TYPE_NONALIASED_COMPONENT (TYPE_CANONICAL (type)) = 1; |
| } |
| |
| /* Set TYPE_REVERSE_STORAGE_ORDER on an array type built by means of |
| build_nonshared_array_type. */ |
| |
| static void |
| set_reverse_storage_order_on_array_type (tree type) |
| { |
| TYPE_REVERSE_STORAGE_ORDER (type) = 1; |
| TYPE_REVERSE_STORAGE_ORDER (TYPE_CANONICAL (type)) = 1; |
| } |
| |
| /* Return true if DISCR1 and DISCR2 represent the same discriminant. */ |
| |
| static bool |
| same_discriminant_p (Entity_Id discr1, Entity_Id discr2) |
| { |
| while (Present (Corresponding_Discriminant (discr1))) |
| discr1 = Corresponding_Discriminant (discr1); |
| |
| while (Present (Corresponding_Discriminant (discr2))) |
| discr2 = Corresponding_Discriminant (discr2); |
| |
| return |
| Original_Record_Component (discr1) == Original_Record_Component (discr2); |
| } |
| |
| /* Return true if the array type GNU_TYPE, which represents a dimension of |
| GNAT_TYPE, has a non-aliased component in the back-end sense. */ |
| |
| static bool |
| array_type_has_nonaliased_component (tree gnu_type, Entity_Id gnat_type) |
| { |
| /* If the array type is not the innermost dimension of the GNAT type, |
| then it has a non-aliased component. */ |
| if (TREE_CODE (TREE_TYPE (gnu_type)) == ARRAY_TYPE |
| && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_type))) |
| return true; |
| |
| /* If the array type has an aliased component in the front-end sense, |
| then it also has an aliased component in the back-end sense. */ |
| if (Has_Aliased_Components (gnat_type)) |
| return false; |
| |
| /* If this is a derived type, then it has a non-aliased component if |
| and only if its parent type also has one. */ |
| if (Is_Derived_Type (gnat_type)) |
| { |
| tree gnu_parent_type = gnat_to_gnu_type (Etype (gnat_type)); |
| int index; |
| if (TREE_CODE (gnu_parent_type) == UNCONSTRAINED_ARRAY_TYPE) |
| gnu_parent_type |
| = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_parent_type)))); |
| for (index = Number_Dimensions (gnat_type) - 1; index > 0; index--) |
| gnu_parent_type = TREE_TYPE (gnu_parent_type); |
| return TYPE_NONALIASED_COMPONENT (gnu_parent_type); |
| } |
| |
| /* Consider that an array of pointers has an aliased component, which is |
| sort of logical and helps with Taft Amendment types in LTO mode. */ |
| if (POINTER_TYPE_P (TREE_TYPE (gnu_type))) |
| return false; |
| |
| /* Otherwise, rely exclusively on properties of the element type. */ |
| return type_for_nonaliased_component_p (TREE_TYPE (gnu_type)); |
| } |
| |
| /* Return true if GNAT_ADDRESS is a value known at compile-time. */ |
| |
| static bool |
| compile_time_known_address_p (Node_Id gnat_address) |
| { |
| /* Handle reference to a constant. */ |
| if (Is_Entity_Name (gnat_address) |
| && Ekind (Entity (gnat_address)) == E_Constant) |
| { |
| gnat_address = Constant_Value (Entity (gnat_address)); |
| if (No (gnat_address)) |
| return false; |
| } |
| |
| /* Catch System'To_Address. */ |
| if (Nkind (gnat_address) == N_Unchecked_Type_Conversion) |
| gnat_address = Expression (gnat_address); |
| |
| return Compile_Time_Known_Value (gnat_address); |
| } |
| |
| /* Return true if GNAT_RANGE, a N_Range node, cannot be superflat, i.e. if the |
| inequality HB >= LB-1 is true. LB and HB are the low and high bounds. */ |
| |
| static bool |
| cannot_be_superflat (Node_Id gnat_range) |
| { |
| Node_Id gnat_lb = Low_Bound (gnat_range), gnat_hb = High_Bound (gnat_range); |
| Node_Id scalar_range; |
| tree gnu_lb, gnu_hb, gnu_lb_minus_one; |
| |
| /* If the low bound is not constant, try to find an upper bound. */ |
| while (Nkind (gnat_lb) != N_Integer_Literal |
| && (Ekind (Etype (gnat_lb)) == E_Signed_Integer_Subtype |
| || Ekind (Etype (gnat_lb)) == E_Modular_Integer_Subtype) |
| && (scalar_range = Scalar_Range (Etype (gnat_lb))) |
| && (Nkind (scalar_range) == N_Signed_Integer_Type_Definition |
| || Nkind (scalar_range) == N_Range)) |
| gnat_lb = High_Bound (scalar_range); |
| |
| /* If the high bound is not constant, try to find a lower bound. */ |
| while (Nkind (gnat_hb) != N_Integer_Literal |
| && (Ekind (Etype (gnat_hb)) == E_Signed_Integer_Subtype |
| || Ekind (Etype (gnat_hb)) == E_Modular_Integer_Subtype) |
| && (scalar_range = Scalar_Range (Etype (gnat_hb))) |
| && (Nkind (scalar_range) == N_Signed_Integer_Type_Definition |
| || Nkind (scalar_range) == N_Range)) |
| gnat_hb = Low_Bound (scalar_range); |
| |
| /* If we have failed to find constant bounds, punt. */ |
| if (Nkind (gnat_lb) != N_Integer_Literal |
| || Nkind (gnat_hb) != N_Integer_Literal) |
| return false; |
| |
| /* We need at least a signed 64-bit type to catch most cases. */ |
| gnu_lb = UI_To_gnu (Intval (gnat_lb), sbitsizetype); |
| gnu_hb = UI_To_gnu (Intval (gnat_hb), sbitsizetype); |
| if (TREE_OVERFLOW (gnu_lb) || TREE_OVERFLOW (gnu_hb)) |
| return false; |
| |
| /* If the low bound is the smallest integer, nothing can be smaller. */ |
| gnu_lb_minus_one = size_binop (MINUS_EXPR, gnu_lb, sbitsize_one_node); |
| if (TREE_OVERFLOW (gnu_lb_minus_one)) |
| return true; |
| |
| return !tree_int_cst_lt (gnu_hb, gnu_lb_minus_one); |
| } |
| |
| /* Return true if GNU_EXPR is (essentially) the address of a CONSTRUCTOR. */ |
| |
| static bool |
| constructor_address_p (tree gnu_expr) |
| { |
| while (TREE_CODE (gnu_expr) == NOP_EXPR |
| || TREE_CODE (gnu_expr) == CONVERT_EXPR |
| || TREE_CODE (gnu_expr) == NON_LVALUE_EXPR) |
| gnu_expr = TREE_OPERAND (gnu_expr, 0); |
| |
| return (TREE_CODE (gnu_expr) == ADDR_EXPR |
| && TREE_CODE (TREE_OPERAND (gnu_expr, 0)) == CONSTRUCTOR); |
| } |
| |
| /* Return true if the size in units represented by GNU_SIZE can be handled by |
| an allocation. If STATIC_P is true, consider only what can be done with a |
| static allocation. */ |
| |
| static bool |
| allocatable_size_p (tree gnu_size, bool static_p) |
| { |
| /* We can allocate a fixed size if it is a valid for the middle-end. */ |
| if (TREE_CODE (gnu_size) == INTEGER_CST) |
| return valid_constant_size_p (gnu_size); |
| |
| /* We can allocate a variable size if this isn't a static allocation. */ |
| else |
| return !static_p; |
| } |
| |
| /* Return true if GNU_EXPR needs a conversion to GNU_TYPE when used as the |
| initial value of an object of GNU_TYPE. */ |
| |
| static bool |
| initial_value_needs_conversion (tree gnu_type, tree gnu_expr) |
| { |
| /* Do not convert if the object's type is unconstrained because this would |
| generate useless evaluations of the CONSTRUCTOR to compute the size. */ |
| if (TREE_CODE (gnu_type) == UNCONSTRAINED_ARRAY_TYPE |
| || CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type))) |
| return false; |
| |
| /* Do not convert if the object's type is a padding record whose field is of |
| self-referential size because we want to copy only the actual data. */ |
| if (type_is_padding_self_referential (gnu_type)) |
| return false; |
| |
| /* Do not convert a call to a function that returns with variable size since |
| we want to use the return slot optimization in this case. */ |
| if (TREE_CODE (gnu_expr) == CALL_EXPR |
| && return_type_with_variable_size_p (TREE_TYPE (gnu_expr))) |
| return false; |
| |
| /* Do not convert to a record type with a variant part from a record type |
| without one, to keep the object simpler. */ |
| if (TREE_CODE (gnu_type) == RECORD_TYPE |
| && TREE_CODE (TREE_TYPE (gnu_expr)) == RECORD_TYPE |
| && get_variant_part (gnu_type) |
| && !get_variant_part (TREE_TYPE (gnu_expr))) |
| return false; |
| |
| /* In all the other cases, convert the expression to the object's type. */ |
| return true; |
| } |
| |
| /* Given GNAT_ENTITY, elaborate all expressions that are required to |
| be elaborated at the point of its definition, but do nothing else. */ |
| |
| void |
| elaborate_entity (Entity_Id gnat_entity) |
| { |
| switch (Ekind (gnat_entity)) |
| { |
| case E_Signed_Integer_Subtype: |
| case E_Modular_Integer_Subtype: |
| case E_Enumeration_Subtype: |
| case E_Ordinary_Fixed_Point_Subtype: |
| case E_Decimal_Fixed_Point_Subtype: |
| case E_Floating_Point_Subtype: |
| { |
| Node_Id gnat_lb = Type_Low_Bound (gnat_entity); |
| Node_Id gnat_hb = Type_High_Bound (gnat_entity); |
| |
| /* ??? Tests to avoid Constraint_Error in static expressions |
| are needed until after the front stops generating bogus |
| conversions on bounds of real types. */ |
| if (!Raises_Constraint_Error (gnat_lb)) |
| elaborate_expression (gnat_lb, gnat_entity, "L", true, false, |
| Needs_Debug_Info (gnat_entity)); |
| if (!Raises_Constraint_Error (gnat_hb)) |
| elaborate_expression (gnat_hb, gnat_entity, "U", true, false, |
| Needs_Debug_Info (gnat_entity)); |
| break; |
| } |
| |
| case E_Record_Subtype: |
| case E_Private_Subtype: |
| case E_Limited_Private_Subtype: |
| case E_Record_Subtype_With_Private: |
| if (Has_Discriminants (gnat_entity) && Is_Constrained (gnat_entity)) |
| { |
| Node_Id gnat_discriminant_expr; |
| Entity_Id gnat_field; |
| |
| for (gnat_field |
| = First_Discriminant (Implementation_Base_Type (gnat_entity)), |
| gnat_discriminant_expr |
| = First_Elmt (Discriminant_Constraint (gnat_entity)); |
| Present (gnat_field); |
| gnat_field = Next_Discriminant (gnat_field), |
| gnat_discriminant_expr = Next_Elmt (gnat_discriminant_expr)) |
| /* Ignore access discriminants. */ |
| if (!Is_Access_Type (Etype (Node (gnat_discriminant_expr)))) |
| elaborate_expression (Node (gnat_discriminant_expr), |
| gnat_entity, get_entity_char (gnat_field), |
| true, false, false); |
| } |
| break; |
| |
| } |
| } |
| |
| /* Prepend to ATTR_LIST an entry for an attribute with provided TYPE, |
| NAME, ARGS and ERROR_POINT. */ |
| |
| static void |
| prepend_one_attribute (struct attrib **attr_list, |
| enum attrib_type attrib_type, |
| tree attr_name, |
| tree attr_args, |
| Node_Id attr_error_point) |
| { |
| struct attrib * attr = (struct attrib *) xmalloc (sizeof (struct attrib)); |
| |
| attr->type = attrib_type; |
| attr->name = attr_name; |
| attr->args = attr_args; |
| attr->error_point = attr_error_point; |
| |
| attr->next = *attr_list; |
| *attr_list = attr; |
| } |
| |
| /* Prepend to ATTR_LIST an entry for an attribute provided by GNAT_PRAGMA. */ |
| |
| static void |
| prepend_one_attribute_pragma (struct attrib **attr_list, Node_Id gnat_pragma) |
| { |
| const Node_Id gnat_arg = Pragma_Argument_Associations (gnat_pragma); |
| tree gnu_arg0 = NULL_TREE, gnu_arg1 = NULL_TREE; |
| enum attrib_type etype; |
| |
| /* Map the pragma at hand. Skip if this isn't one we know how to handle. */ |
| switch (Get_Pragma_Id (Chars (Pragma_Identifier (gnat_pragma)))) |
| { |
| case Pragma_Machine_Attribute: |
| etype = ATTR_MACHINE_ATTRIBUTE; |
| break; |
| |
| case Pragma_Linker_Alias: |
| etype = ATTR_LINK_ALIAS; |
| break; |
| |
| case Pragma_Linker_Section: |
| etype = ATTR_LINK_SECTION; |
| break; |
| |
| case Pragma_Linker_Constructor: |
| etype = ATTR_LINK_CONSTRUCTOR; |
| break; |
| |
| case Pragma_Linker_Destructor: |
| etype = ATTR_LINK_DESTRUCTOR; |
| break; |
| |
| case Pragma_Weak_External: |
| etype = ATTR_WEAK_EXTERNAL; |
| break; |
| |
| case Pragma_Thread_Local_Storage: |
| etype = ATTR_THREAD_LOCAL_STORAGE; |
| break; |
| |
| default: |
| return; |
| } |
| |
| /* See what arguments we have and turn them into GCC trees for attribute |
| handlers. These expect identifier for strings. We handle at most two |
| arguments and static expressions only. */ |
| if (Present (gnat_arg) && Present (First (gnat_arg))) |
| { |
| Node_Id gnat_arg0 = Next (First (gnat_arg)); |
| Node_Id gnat_arg1 = Empty; |
| |
| if (Present (gnat_arg0) |
| && Is_OK_Static_Expression (Expression (gnat_arg0))) |
| { |
| gnu_arg0 = gnat_to_gnu (Expression (gnat_arg0)); |
| |
| if (TREE_CODE (gnu_arg0) == STRING_CST) |
| { |
| gnu_arg0 = get_identifier (TREE_STRING_POINTER (gnu_arg0)); |
| if (IDENTIFIER_LENGTH (gnu_arg0) == 0) |
| return; |
| } |
| |
| gnat_arg1 = Next (gnat_arg0); |
| } |
| |
| if (Present (gnat_arg1) |
| && Is_OK_Static_Expression (Expression (gnat_arg1))) |
| { |
| gnu_arg1 = gnat_to_gnu (Expression (gnat_arg1)); |
| |
| if (TREE_CODE (gnu_arg1) == STRING_CST) |
| gnu_arg1 = get_identifier (TREE_STRING_POINTER (gnu_arg1)); |
| } |
| } |
| |
| /* Prepend to the list. Make a list of the argument we might have, as GCC |
| expects it. */ |
| prepend_one_attribute (attr_list, etype, gnu_arg0, |
| gnu_arg1 |
| ? build_tree_list (NULL_TREE, gnu_arg1) : NULL_TREE, |
| Present (Next (First (gnat_arg))) |
| ? Expression (Next (First (gnat_arg))) : gnat_pragma); |
| } |
| |
| /* Prepend to ATTR_LIST the list of attributes for GNAT_ENTITY, if any. */ |
| |
| static void |
| prepend_attributes (struct attrib **attr_list, Entity_Id gnat_entity) |
| { |
| Node_Id gnat_temp; |
| |
| /* Attributes are stored as Representation Item pragmas. */ |
| for (gnat_temp = First_Rep_Item (gnat_entity); |
| Present (gnat_temp); |
| gnat_temp = Next_Rep_Item (gnat_temp)) |
| if (Nkind (gnat_temp) == N_Pragma) |
| prepend_one_attribute_pragma (attr_list, gnat_temp); |
| } |
| |
| /* Given a GNAT tree GNAT_EXPR, for an expression which is a value within a |
| type definition (either a bound or a discriminant value) for GNAT_ENTITY, |
| return the GCC tree to use for that expression. S is the suffix to use |
| if a variable needs to be created and DEFINITION is true if this is done |
| for a definition of GNAT_ENTITY. If NEED_VALUE is true, we need a result; |
| otherwise, we are just elaborating the expression for side-effects. If |
| NEED_DEBUG is true, we need a variable for debugging purposes even if it |
| isn't needed for code generation. */ |
| |
| static tree |
| elaborate_expression (Node_Id gnat_expr, Entity_Id gnat_entity, const char *s, |
| bool definition, bool need_value, bool need_debug) |
| { |
| tree gnu_expr; |
| |
| /* If we already elaborated this expression (e.g. it was involved |
| in the definition of a private type), use the old value. */ |
| if (present_gnu_tree (gnat_expr)) |
| return get_gnu_tree (gnat_expr); |
| |
| /* If we don't need a value and this is static or a discriminant, |
| we don't need to do anything. */ |
| if (!need_value |
| && (Is_OK_Static_Expression (gnat_expr) |
| || (Nkind (gnat_expr) == N_Identifier |
| && Ekind (Entity (gnat_expr)) == E_Discriminant))) |
| return NULL_TREE; |
| |
| /* If it's a static expression, we don't need a variable for debugging. */ |
| if (need_debug && Is_OK_Static_Expression (gnat_expr)) |
| need_debug = false; |
| |
| /* Otherwise, convert this tree to its GCC equivalent and elaborate it. */ |
| gnu_expr = elaborate_expression_1 (gnat_to_gnu (gnat_expr), gnat_entity, s, |
| definition, need_debug); |
| |
| /* Save the expression in case we try to elaborate this entity again. Since |
| it's not a DECL, don't check it. Don't save if it's a discriminant. */ |
| if (!CONTAINS_PLACEHOLDER_P (gnu_expr)) |
| save_gnu_tree (gnat_expr, gnu_expr, true); |
| |
| return need_value ? gnu_expr : error_mark_node; |
| } |
| |
| /* Similar, but take a GNU expression and always return a result. */ |
| |
| static tree |
| elaborate_expression_1 (tree gnu_expr, Entity_Id gnat_entity, const char *s, |
| bool definition, bool need_debug) |
| { |
| const bool expr_public_p = Is_Public (gnat_entity); |
| const bool expr_global_p = expr_public_p || global_bindings_p (); |
| bool expr_variable_p, use_variable; |
| |
| /* If GNU_EXPR contains a placeholder, just return it. We rely on the fact |
| that an expression cannot contain both a discriminant and a variable. */ |
| if (CONTAINS_PLACEHOLDER_P (gnu_expr)) |
| return gnu_expr; |
| |
| /* If GNU_EXPR is neither a constant nor based on a read-only variable, make |
| a variable that is initialized to contain the expression when the package |
| containing the definition is elaborated. If this entity is defined at top |
| level, replace the expression by the variable; otherwise use a SAVE_EXPR |
| if this is necessary. */ |
| if (TREE_CONSTANT (gnu_expr)) |
| expr_variable_p = false; |
| else |
| { |
| /* Skip any conversions and simple constant arithmetics to see if the |
| expression is based on a read-only variable. */ |
| tree inner = remove_conversions (gnu_expr, true); |
| |
| inner = skip_simple_constant_arithmetic (inner); |
| |
| if (handled_component_p (inner)) |
| inner = get_inner_constant_reference (inner); |
| |
| expr_variable_p |
| = !(inner |
| && TREE_CODE (inner) == VAR_DECL |
| && (TREE_READONLY (inner) || DECL_READONLY_ONCE_ELAB (inner))); |
| } |
| |
| /* We only need to use the variable if we are in a global context since GCC |
| can do the right thing in the local case. However, when not optimizing, |
| use it for bounds of loop iteration scheme to avoid code duplication. */ |
| use_variable = expr_variable_p |
| && (expr_global_p |
| || (!optimize |
| && definition |
| && Is_Itype (gnat_entity) |
| && Nkind (Associated_Node_For_Itype (gnat_entity)) |
| == N_Loop_Parameter_Specification)); |
| |
| /* Now create it, possibly only for debugging purposes. */ |
| if (use_variable || need_debug) |
| { |
| /* The following variable creation can happen when processing the body |
| of subprograms that are defined out of the extended main unit and |
| inlined. In this case, we are not at the global scope, and thus the |
| new variable must not be tagged "external", as we used to do here as |
| soon as DEFINITION was false. */ |
| tree gnu_decl |
| = create_var_decl (create_concat_name (gnat_entity, s), NULL_TREE, |
| TREE_TYPE (gnu_expr), gnu_expr, true, |
| expr_public_p, !definition && expr_global_p, |
| expr_global_p, false, true, need_debug, |
| NULL, gnat_entity); |
| |
| /* Using this variable at debug time (if need_debug is true) requires a |
| proper location. The back-end will compute a location for this |
| variable only if the variable is used by the generated code. |
| Returning the variable ensures the caller will use it in generated |
| code. Note that there is no need for a location if the debug info |
| contains an integer constant. |
| TODO: when the encoding-based debug scheme is dropped, move this |
| condition to the top-level IF block: we will not need to create a |
| variable anymore in such cases, then. */ |
| if (use_variable || (need_debug && !TREE_CONSTANT (gnu_expr))) |
| return gnu_decl; |
| } |
| |
| return expr_variable_p ? gnat_save_expr (gnu_expr) : gnu_expr; |
| } |
| |
| /* Similar, but take an alignment factor and make it explicit in the tree. */ |
| |
| static tree |
| elaborate_expression_2 (tree gnu_expr, Entity_Id gnat_entity, const char *s, |
| bool definition, bool need_debug, unsigned int align) |
| { |
| tree unit_align = size_int (align / BITS_PER_UNIT); |
| return |
| size_binop (MULT_EXPR, |
| elaborate_expression_1 (size_binop (EXACT_DIV_EXPR, |
| gnu_expr, |
| unit_align), |
| gnat_entity, s, definition, |
| need_debug), |
| unit_align); |
| } |
| |
| /* Structure to hold internal data for elaborate_reference. */ |
| |
| struct er_data |
| { |
| Entity_Id entity; |
| bool definition; |
| unsigned int n; |
| }; |
| |
| /* Wrapper function around elaborate_expression_1 for elaborate_reference. */ |
| |
| static tree |
| elaborate_reference_1 (tree ref, void *data) |
| { |
| struct er_data *er = (struct er_data *)data; |
| char suffix[16]; |
| |
| /* This is what elaborate_expression_1 does if NEED_DEBUG is false. */ |
| if (TREE_CONSTANT (ref)) |
| return ref; |
| |
| /* If this is a COMPONENT_REF of a fat pointer, elaborate the entire fat |
| pointer. This may be more efficient, but will also allow us to more |
| easily find the match for the PLACEHOLDER_EXPR. */ |
| if (TREE_CODE (ref) == COMPONENT_REF |
| && TYPE_IS_FAT_POINTER_P (TREE_TYPE (TREE_OPERAND (ref, 0)))) |
| return build3 (COMPONENT_REF, TREE_TYPE (ref), |
| elaborate_reference_1 (TREE_OPERAND (ref, 0), data), |
| TREE_OPERAND (ref, 1), NULL_TREE); |
| |
| sprintf (suffix, "EXP%d", ++er->n); |
| return |
| elaborate_expression_1 (ref, er->entity, suffix, er->definition, false); |
| } |
| |
| /* Elaborate the reference REF to be used as renamed object for GNAT_ENTITY. |
| DEFINITION is true if this is done for a definition of GNAT_ENTITY and |
| INIT is set to the first arm of a COMPOUND_EXPR present in REF, if any. */ |
| |
| static tree |
| elaborate_reference (tree ref, Entity_Id gnat_entity, bool definition, |
| tree *init) |
| { |
| struct er_data er = { gnat_entity, definition, 0 }; |
| return gnat_rewrite_reference (ref, elaborate_reference_1, &er, init); |
| } |
| |
| /* Given a GNU tree and a GNAT list of choices, generate an expression to test |
| the value passed against the list of choices. */ |
| |
| static tree |
| choices_to_gnu (tree gnu_operand, Node_Id gnat_choices) |
| { |
| tree gnu_result = boolean_false_node, gnu_type; |
| |
| gnu_operand = maybe_character_value (gnu_operand); |
| gnu_type = TREE_TYPE (gnu_operand); |
| |
| for (Node_Id gnat_choice = First (gnat_choices); |
| Present (gnat_choice); |
| gnat_choice = Next (gnat_choice)) |
| { |
| tree gnu_low = NULL_TREE, gnu_high = NULL_TREE; |
| tree gnu_test; |
| |
| switch (Nkind (gnat_choice)) |
| { |
| case N_Range: |
| gnu_low = gnat_to_gnu (Low_Bound (gnat_choice)); |
| gnu_high = gnat_to_gnu (High_Bound (gnat_choice)); |
| break; |
| |
| case N_Subtype_Indication: |
| gnu_low = gnat_to_gnu (Low_Bound (Range_Expression |
| (Constraint (gnat_choice)))); |
| gnu_high = gnat_to_gnu (High_Bound (Range_Expression |
| (Constraint (gnat_choice)))); |
| break; |
| |
| case N_Identifier: |
| case N_Expanded_Name: |
| /* This represents either a subtype range or a static value of |
| some kind; Ekind says which. */ |
| if (Is_Type (Entity (gnat_choice))) |
| { |
| tree gnu_type = get_unpadded_type (Entity (gnat_choice)); |
| |
| gnu_low = TYPE_MIN_VALUE (gnu_type); |
| gnu_high = TYPE_MAX_VALUE (gnu_type); |
| break; |
| } |
| |
| /* ... fall through ... */ |
| |
| case N_Character_Literal: |
| case N_Integer_Literal: |
| gnu_low = gnat_to_gnu (gnat_choice); |
| break; |
| |
| case N_Others_Choice: |
| break; |
| |
| default: |
| gcc_unreachable (); |
| } |
| |
| /* Everything should be folded into constants at this point. */ |
| gcc_assert (!gnu_low || TREE_CODE (gnu_low) == INTEGER_CST); |
| gcc_assert (!gnu_high || TREE_CODE (gnu_high) == INTEGER_CST); |
| |
| if (gnu_low && TREE_TYPE (gnu_low) != gnu_type) |
| gnu_low = convert (gnu_type, gnu_low); |
| if (gnu_high && TREE_TYPE (gnu_high) != gnu_type) |
| gnu_high = convert (gnu_type, gnu_high); |
| |
| if (gnu_low && gnu_high) |
| gnu_test |
| = build_binary_op (TRUTH_ANDIF_EXPR, boolean_type_node, |
| build_binary_op (GE_EXPR, boolean_type_node, |
| gnu_operand, gnu_low, true), |
| build_binary_op (LE_EXPR, boolean_type_node, |
| gnu_operand, gnu_high, true), |
| true); |
| else if (gnu_low) |
| gnu_test |
| = build_binary_op (EQ_EXPR, boolean_type_node, gnu_operand, gnu_low, |
| true); |
| else |
| gnu_test = boolean_true_node; |
| |
| if (gnu_result == boolean_false_node) |
| gnu_result = gnu_test; |
| else |
| gnu_result |
| = build_binary_op (TRUTH_ORIF_EXPR, boolean_type_node, gnu_result, |
| gnu_test, true); |
| } |
| |
| return gnu_result; |
| } |
| |
| /* Adjust PACKED setting as passed to gnat_to_gnu_field for a field of |
| type FIELD_TYPE to be placed in RECORD_TYPE. Return the result. */ |
| |
| static int |
| adjust_packed (tree field_type, tree record_type, int packed) |
| { |
| /* If the field contains an item of variable size, we cannot pack it |
| because we cannot create temporaries of non-fixed size in case |
| we need to take the address of the field. See addressable_p and |
| the notes on the addressability issues for further details. */ |
| if (type_has_variable_size (field_type)) |
| return 0; |
| |
| /* In the other cases, we can honor the packing. */ |
| if (packed) |
| return packed; |
| |
| /* If the alignment of the record is specified and the field type |
| is over-aligned, request Storage_Unit alignment for the field. */ |
| if (TYPE_ALIGN (record_type) |
| && TYPE_ALIGN (field_type) > TYPE_ALIGN (record_type)) |
| return -1; |
| |
| /* Likewise if the maximum alignment of the record is specified. */ |
| if (TYPE_MAX_ALIGN (record_type) |
| && TYPE_ALIGN (field_type) > TYPE_MAX_ALIGN (record_type)) |
| return -1; |
| |
| return 0; |
| } |
| |
| /* Return a GCC tree for a field corresponding to GNAT_FIELD to be |
| placed in GNU_RECORD_TYPE. |
| |
| PACKED is 1 if the enclosing record is packed or -1 if the enclosing |
| record has Component_Alignment of Storage_Unit. |
| |
| DEFINITION is true if this field is for a record being defined. |
| |
| DEBUG_INFO_P is true if we need to write debug information for types |
| that we may create in the process. */ |
| |
| static tree |
| gnat_to_gnu_field (Entity_Id gnat_field, tree gnu_record_type, int packed, |
| bool definition, bool debug_info_p) |
| { |
| const Node_Id gnat_clause = Component_Clause (gnat_field); |
| const Entity_Id gnat_record_type = Underlying_Type (Scope (gnat_field)); |
| const Entity_Id gnat_field_type = Etype (gnat_field); |
| const bool is_atomic |
| = (Is_Atomic_Or_VFA (gnat_field) || Is_Atomic_Or_VFA (gnat_field_type)); |
| const bool is_aliased = Is_Aliased (gnat_field); |
| const bool is_independent |
| = (Is_Independent (gnat_field) || Is_Independent (gnat_field_type)); |
| const bool is_volatile |
| = (Treat_As_Volatile (gnat_field) || Treat_As_Volatile (gnat_field_type)); |
| const bool is_strict_alignment = Strict_Alignment (gnat_field_type); |
| /* We used to consider that volatile fields also require strict alignment, |
| but that was an interpolation and would cause us to reject a pragma |
| volatile on a packed record type containing boolean components, while |
| there is no basis to do so in the RM. In such cases, the writes will |
| involve load-modify-store sequences, but that's OK for volatile. The |
| only constraint is the implementation advice whereby only the bits of |
| the components should be accessed if they both start and end on byte |
| boundaries, but that should be guaranteed by the GCC memory model. */ |
| const bool needs_strict_alignment |
| = (is_atomic || is_aliased || is_independent || is_strict_alignment); |
| tree gnu_field_type = gnat_to_gnu_type (gnat_field_type); |
| tree gnu_field_id = get_entity_name (gnat_field); |
| tree gnu_field, gnu_size, gnu_pos; |
| |
| /* If this field requires strict alignment, we cannot pack it because |
| it would very likely be under-aligned in the record. */ |
| if (needs_strict_alignment) |
| packed = 0; |
| else |
| packed = adjust_packed (gnu_field_type, gnu_record_type, packed); |
| |
| /* If a size is specified, use it. Otherwise, if the record type is packed, |
| use the official RM size. See "Handling of Type'Size Values" in Einfo |
| for further details. */ |
| if (Known_Esize (gnat_field) || Present (gnat_clause)) |
| gnu_size = validate_size (Esize (gnat_field), gnu_field_type, gnat_field, |
| FIELD_DECL, false, true); |
| else if (packed == 1) |
| { |
| gnu_size = rm_size (gnu_field_type); |
| if (TREE_CODE (gnu_size) != INTEGER_CST) |
| gnu_size = NULL_TREE; |
| } |
| else |
| gnu_size = NULL_TREE; |
| |
| /* If we have a specified size that is smaller than that of the field's type, |
| or a position is specified, and the field's type is a record that doesn't |
| require strict alignment, see if we can get either an integral mode form |
| of the type or a smaller form. If we can, show a size was specified for |
| the field if there wasn't one already, so we know to make this a bitfield |
| and avoid making things wider. |
| |
| Changing to an integral mode form is useful when the record is packed as |
| we can then place the field at a non-byte-aligned position and so achieve |
| tighter packing. This is in addition required if the field shares a byte |
| with another field and the front-end lets the back-end handle the access |
| to the field, because GCC cannot handle non-byte-aligned BLKmode fields. |
| |
| Changing to a smaller form is required if the specified size is smaller |
| than that of the field's type and the type contains sub-fields that are |
| padded, in order to avoid generating accesses to these sub-fields that |
| are wider than the field. |
| |
| We avoid the transformation if it is not required or potentially useful, |
| as it might entail an increase of the field's alignment and have ripple |
| effects on the outer record type. A typical case is a field known to be |
| byte-aligned and not to share a byte with another field. */ |
| if (!needs_strict_alignment |
| && RECORD_OR_UNION_TYPE_P (gnu_field_type) |
| && !TYPE_FAT_POINTER_P (gnu_field_type) |
| && tree_fits_uhwi_p (TYPE_SIZE (gnu_field_type)) |
| && (packed == 1 |
| || (gnu_size |
| && (tree_int_cst_lt (gnu_size, TYPE_SIZE (gnu_field_type)) |
| || (Present (gnat_clause) |
| && !(UI_To_Int (Component_Bit_Offset (gnat_field)) |
| % BITS_PER_UNIT == 0 |
| && value_factor_p (gnu_size, BITS_PER_UNIT))))))) |
| { |
| tree gnu_packable_type = make_packable_type (gnu_field_type, true); |
| if (gnu_packable_type != gnu_field_type) |
| { |
| gnu_field_type = gnu_packable_type; |
| if (!gnu_size) |
| gnu_size = rm_size (gnu_field_type); |
| } |
| } |
| |
| if (Is_Atomic_Or_VFA (gnat_field)) |
| { |
| const unsigned int align |
| = promote_object_alignment (gnu_field_type, gnat_field); |
| if (align > 0) |
| gnu_field_type |
| = maybe_pad_type (gnu_field_type, NULL_TREE, align, gnat_field, |
| false, false, definition, true); |
| check_ok_for_atomic_type (gnu_field_type, gnat_field, false); |
| } |
| |
| if (Present (gnat_clause)) |
| { |
| Entity_Id gnat_parent = Parent_Subtype (gnat_record_type); |
| |
| gnu_pos = UI_To_gnu (Component_Bit_Offset (gnat_field), bitsizetype); |
| |
| /* Ensure the position does not overlap with the parent subtype, if there |
| is one. This test is omitted if the parent of the tagged type has a |
| full rep clause since, in this case, component clauses are allowed to |
| overlay the space allocated for the parent type and the front-end has |
| checked that there are no overlapping components. */ |
| if (Present (gnat_parent) && !Is_Fully_Repped_Tagged_Type (gnat_parent)) |
| { |
| tree gnu_parent = gnat_to_gnu_type (gnat_parent); |
| |
| if (TREE_CODE (TYPE_SIZE (gnu_parent)) == INTEGER_CST |
| && tree_int_cst_lt (gnu_pos, TYPE_SIZE (gnu_parent))) |
| post_error_ne_tree |
| ("offset of& must be beyond parent{, minimum allowed is ^}", |
| Position (gnat_clause), gnat_field, TYPE_SIZE_UNIT (gnu_parent)); |
| } |
| |
| /* If this field needs strict alignment, make sure that the record is |
| sufficiently aligned and that the position and size are consistent |
| with the type. But don't do it if we are just annotating types and |
| the field's type is tagged, since tagged types aren't fully laid out |
| in this mode. Also, note that atomic implies volatile so the inner |
| test sequences ordering is significant here. */ |
| if (needs_strict_alignment |
| && !(type_annotate_only && Is_Tagged_Type (gnat_field_type))) |
| { |
| const unsigned int type_align = TYPE_ALIGN (gnu_field_type); |
| |
| if (TYPE_ALIGN (gnu_record_type) |
| && TYPE_ALIGN (gnu_record_type) < type_align) |
| SET_TYPE_ALIGN (gnu_record_type, type_align); |
| |
| /* If the position is not a multiple of the alignment of the type, |
| then error out and reset the position. */ |
| if (!integer_zerop (size_binop (TRUNC_MOD_EXPR, gnu_pos, |
| bitsize_int (type_align)))) |
| { |
| const char *s; |
| |
| if (is_atomic) |
| s = "position of atomic field& must be multiple of ^ bits"; |
| else if (is_aliased) |
| s = "position of aliased field& must be multiple of ^ bits"; |
| else if (is_independent) |
| s = "position of independent field& must be multiple of ^ bits"; |
| else if (is_strict_alignment) |
| s = "position of & with aliased or tagged part must be" |
| " multiple of ^ bits"; |
| else |
| gcc_unreachable (); |
| |
| post_error_ne_num (s, First_Bit (gnat_clause), gnat_field, |
| type_align); |
| gnu_pos = NULL_TREE; |
| } |
| |
| if (gnu_size) |
| { |
| tree gnu_type_size = TYPE_SIZE (gnu_field_type); |
| const int cmp = tree_int_cst_compare (gnu_size, gnu_type_size); |
| |
| /* If the size is lower than that of the type, or greater for |
| atomic and aliased, then error out and reset the size. */ |
| if (cmp < 0 || (cmp > 0 && (is_atomic || is_aliased))) |
| { |
| const char *s; |
| |
| if (is_atomic) |
| s = "size of atomic field& must be ^ bits"; |
| else if (is_aliased) |
| s = "size of aliased field& must be ^ bits"; |
| else if (is_independent) |
| s = "size of independent field& must be at least ^ bits"; |
| else if (is_strict_alignment) |
| s = "size of & with aliased or tagged part must be" |
| " at least ^ bits"; |
| else |
| gcc_unreachable (); |
| |
| post_error_ne_tree (s, Last_Bit (gnat_clause), gnat_field, |
| gnu_type_size); |
| gnu_size = NULL_TREE; |
| } |
| |
| /* Likewise if the size is not a multiple of a byte, */ |
| else if (!integer_zerop (size_binop (TRUNC_MOD_EXPR, gnu_size, |
| bitsize_unit_node))) |
| { |
| const char *s; |
| |
| if (is_independent) |
| s = "size of independent field& must be multiple of" |
| " Storage_Unit"; |
| else if (is_strict_alignment) |
| s = "size of & with aliased or tagged part must be" |
| " multiple of Storage_Unit"; |
| else |
| gcc_unreachable (); |
| |
| post_error_ne (s, Last_Bit (gnat_clause), gnat_field); |
| gnu_size = NULL_TREE; |
| } |
| } |
| } |
| } |
| |
| /* If the record has rep clauses and this is the tag field, make a rep |
| clause for it as well. */ |
| else if (Has_Specified_Layout (gnat_record_type) |
| && Chars (gnat_field) == Name_uTag) |
| { |
| gnu_pos = bitsize_zero_node; |
| gnu_size = TYPE_SIZE (gnu_field_type); |
| } |
| |
| else |
| { |
| gnu_pos = NULL_TREE; |
| |
| /* If we are packing the record and the field is BLKmode, round the |
| size up to a byte boundary. */ |
| if (packed && TYPE_MODE (gnu_field_type) == BLKmode && gnu_size) |
| gnu_size = round_up (gnu_size, BITS_PER_UNIT); |
| } |
| |
| /* We need to make the size the maximum for the type if it is |
| self-referential and an unconstrained type. In that case, we can't |
| pack the field since we can't make a copy to align it. */ |
| if (TREE_CODE (gnu_field_type) == RECORD_TYPE |
| && !gnu_size |
| && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_field_type)) |
| && !Is_Constrained (Underlying_Type (gnat_field_type))) |
| { |
| gnu_size = max_size (TYPE_SIZE (gnu_field_type), true); |
| packed = 0; |
| } |
| |
| /* If a size is specified, adjust the field's type to it. */ |
| if (gnu_size) |
| { |
| tree orig_field_type; |
| |
| /* If the field's type is justified modular, we would need to remove |
| the wrapper to (better) meet the layout requirements. However we |
| can do so only if the field is not aliased to preserve the unique |
| layout, if it has the same storage order as the enclosing record |
| and if the prescribed size is not greater than that of the packed |
| array to preserve the justification. */ |
| if (!needs_strict_alignment |
| && TREE_CODE (gnu_field_type) == RECORD_TYPE |
| && TYPE_JUSTIFIED_MODULAR_P (gnu_field_type) |
| && TYPE_REVERSE_STORAGE_ORDER (gnu_field_type) |
| == Reverse_Storage_Order (gnat_record_type) |
| && tree_int_cst_compare (gnu_size, TYPE_ADA_SIZE (gnu_field_type)) |
| <= 0) |
| gnu_field_type = TREE_TYPE (TYPE_FIELDS (gnu_field_type)); |
| |
| /* Similarly if the field's type is a misaligned integral type, but |
| there is no restriction on the size as there is no justification. */ |
| if (!needs_strict_alignment |
| && TYPE_IS_PADDING_P (gnu_field_type) |
| && INTEGRAL_TYPE_P (TREE_TYPE (TYPE_FIELDS (gnu_field_type)))) |
| gnu_field_type = TREE_TYPE (TYPE_FIELDS (gnu_field_type)); |
| |
| gnu_field_type |
| = make_type_from_size (gnu_field_type, gnu_size, |
| Has_Biased_Representation (gnat_field)); |
| |
| orig_field_type = gnu_field_type; |
| gnu_field_type = maybe_pad_type (gnu_field_type, gnu_size, 0, gnat_field, |
| false, false, definition, true); |
| |
| /* If a padding record was made, declare it now since it will never be |
| declared otherwise. This is necessary to ensure that its subtrees |
| are properly marked. */ |
| if (gnu_field_type != orig_field_type |
| && !DECL_P (TYPE_NAME (gnu_field_type))) |
| create_type_decl (TYPE_NAME (gnu_field_type), gnu_field_type, true, |
| debug_info_p, gnat_field); |
| } |
| |
| /* Otherwise (or if there was an error), don't specify a position. */ |
| else |
| gnu_pos = NULL_TREE; |
| |
| /* If the field's type is a padded type made for a scalar field of a record |
| type with reverse storage order, we need to propagate the reverse storage |
| order to the padding type since it is the innermost enclosing aggregate |
| type around the scalar. */ |
| if (TYPE_IS_PADDING_P (gnu_field_type) |
| && TYPE_REVERSE_STORAGE_ORDER (gnu_record_type) |
| && Is_Scalar_Type (gnat_field_type)) |
| gnu_field_type = set_reverse_storage_order_on_pad_type (gnu_field_type); |
| |
| gcc_assert (TREE_CODE (gnu_field_type) != RECORD_TYPE |
| || !TYPE_CONTAINS_TEMPLATE_P (gnu_field_type)); |
| |
| /* Now create the decl for the field. */ |
| gnu_field |
| = create_field_decl (gnu_field_id, gnu_field_type, gnu_record_type, |
| gnu_size, gnu_pos, packed, is_aliased); |
| Sloc_to_locus (Sloc (gnat_field), &DECL_SOURCE_LOCATION (gnu_field)); |
| DECL_ALIASED_P (gnu_field) = is_aliased; |
| TREE_SIDE_EFFECTS (gnu_field) = TREE_THIS_VOLATILE (gnu_field) = is_volatile; |
| |
| if (Ekind (gnat_field) == E_Discriminant) |
| { |
| DECL_INVARIANT_P (gnu_field) |
| = No (Discriminant_Default_Value (gnat_field)); |
| DECL_DISCRIMINANT_NUMBER (gnu_field) |
| = UI_To_gnu (Discriminant_Number (gnat_field), sizetype); |
| } |
| |
| return gnu_field; |
| } |
| |
| /* Return true if at least one member of COMPONENT_LIST needs strict |
| alignment. */ |
| |
| static bool |
| components_need_strict_alignment (Node_Id component_list) |
| { |
| Node_Id component_decl; |
| |
| for (component_decl = First_Non_Pragma (Component_Items (component_list)); |
| Present (component_decl); |
| component_decl = Next_Non_Pragma (component_decl)) |
| { |
| Entity_Id gnat_field = Defining_Entity (component_decl); |
| |
| if (Is_Aliased (gnat_field)) |
| return true; |
| |
| if (Strict_Alignment (Etype (gnat_field))) |
| return true; |
| } |
| |
| return false; |
| } |
| |
| /* Return true if TYPE is a type with variable size or a padding type with a |
| field of variable size or a record that has a field with such a type. */ |
| |
| static bool |
| type_has_variable_size (tree type) |
| { |
| tree field; |
| |
| if (!TREE_CONSTANT (TYPE_SIZE (type))) |
| return true; |
| |
| if (TYPE_IS_PADDING_P (type) |
| && !TREE_CONSTANT (DECL_SIZE (TYPE_FIELDS (type)))) |
| return true; |
| |
| if (!RECORD_OR_UNION_TYPE_P (type)) |
| return false; |
| |
| for (field = TYPE_FIELDS (type); field; field = DECL_CHAIN (field)) |
| if (type_has_variable_size (TREE_TYPE (field))) |
| return true; |
| |
| return false; |
| } |
| |
| /* Return true if FIELD is an artificial field. */ |
| |
| static bool |
| field_is_artificial (tree field) |
| { |
| /* These fields are generated by the front-end proper. */ |
| if (IDENTIFIER_POINTER (DECL_NAME (field)) [0] == '_') |
| return true; |
| |
| /* These fields are generated by gigi. */ |
| if (DECL_INTERNAL_P (field)) |
| return true; |
| |
| return false; |
| } |
| |
| /* Return true if FIELD is a non-artificial field with self-referential |
| size. */ |
| |
| static bool |
| field_has_self_size (tree field) |
| { |
| if (field_is_artificial (field)) |
| return false; |
| |
| if (DECL_SIZE (field) && TREE_CODE (DECL_SIZE (field)) == INTEGER_CST) |
| return false; |
| |
| return CONTAINS_PLACEHOLDER_P (TYPE_SIZE (TREE_TYPE (field))); |
| } |
| |
| /* Return true if FIELD is a non-artificial field with variable size. */ |
| |
| static bool |
| field_has_variable_size (tree field) |
| { |
| if (field_is_artificial (field)) |
| return false; |
| |
| if (DECL_SIZE (field) && TREE_CODE (DECL_SIZE (field)) == INTEGER_CST) |
| return false; |
| |
| return TREE_CODE (TYPE_SIZE (TREE_TYPE (field))) != INTEGER_CST; |
| } |
| |
| /* qsort comparer for the bit positions of two record components. */ |
| |
| static int |
| compare_field_bitpos (const PTR rt1, const PTR rt2) |
| { |
| const_tree const field1 = * (const_tree const *) rt1; |
| const_tree const field2 = * (const_tree const *) rt2; |
| const int ret |
| = tree_int_cst_compare (bit_position (field1), bit_position (field2)); |
| |
| return ret ? ret : (int) (DECL_UID (field1) - DECL_UID (field2)); |
| } |
| |
| /* Sort the LIST of fields in reverse order of increasing position. */ |
| |
| static tree |
| reverse_sort_field_list (tree list) |
| { |
| const int len = list_length (list); |
| tree *field_arr = XALLOCAVEC (tree, len); |
| |
| for (int i = 0; list; list = DECL_CHAIN (list), i++) |
| field_arr[i] = list; |
| |
| qsort (field_arr, len, sizeof (tree), compare_field_bitpos); |
| |
| for (int i = 0; i < len; i++) |
| { |
| DECL_CHAIN (field_arr[i]) = list; |
| list = field_arr[i]; |
| } |
| |
| return list; |
| } |
| |
| /* Reverse function from gnat_to_gnu_field: return the GNAT field present in |
| either GNAT_COMPONENT_LIST or the discriminants of GNAT_RECORD_TYPE, and |
| corresponding to the GNU tree GNU_FIELD. */ |
| |
| static Entity_Id |
| gnu_field_to_gnat (tree gnu_field, Node_Id gnat_component_list, |
| Entity_Id gnat_record_type) |
| { |
| Entity_Id gnat_component_decl, gnat_field; |
| |
| if (Present (Component_Items (gnat_component_list))) |
| for (gnat_component_decl |
| = First_Non_Pragma (Component_Items (gnat_component_list)); |
| Present (gnat_component_decl); |
| gnat_component_decl = Next_Non_Pragma (gnat_component_decl)) |
| { |
| gnat_field = Defining_Entity (gnat_component_decl); |
| if (gnat_to_gnu_field_decl (gnat_field) == gnu_field) |
| return gnat_field; |
| } |
| |
| if (Has_Discriminants (gnat_record_type)) |
| for (gnat_field = First_Stored_Discriminant (gnat_record_type); |
| Present (gnat_field); |
| gnat_field = Next_Stored_Discriminant (gnat_field)) |
| if (gnat_to_gnu_field_decl (gnat_field) == gnu_field) |
| return gnat_field; |
| |
| return Empty; |
| } |
| |
| /* Issue a warning for the problematic placement of GNU_FIELD present in |
| either GNAT_COMPONENT_LIST or the discriminants of GNAT_RECORD_TYPE. |
| IN_VARIANT is true if GNAT_COMPONENT_LIST is the list of a variant. |
| DO_REORDER is true if fields of GNAT_RECORD_TYPE are being reordered. */ |
| |
| static void |
| warn_on_field_placement (tree gnu_field, Node_Id gnat_component_list, |
| Entity_Id gnat_record_type, bool in_variant, |
| bool do_reorder) |
| { |
| if (!Comes_From_Source (gnat_record_type)) |
| return; |
| |
| Entity_Id gnat_field |
| = gnu_field_to_gnat (gnu_field, gnat_component_list, gnat_record_type); |
| gcc_assert (Present (gnat_field)); |
| |
| const char *msg1 |
| = in_variant |
| ? "?variant layout may cause performance issues" |
| : "?record layout may cause performance issues"; |
| const char *msg2 |
| = Ekind (gnat_field) == E_Discriminant |
| ? "?discriminant & whose length is not multiple of a byte" |
| : field_has_self_size (gnu_field) |
| ? "?component & whose length depends on a discriminant" |
| : field_has_variable_size (gnu_field) |
| ? "?component & whose length is not fixed" |
| : "?component & whose length is not multiple of a byte"; |
| const char *msg3 |
| = do_reorder |
| ? "?comes too early and was moved down" |
| : "?comes too early and ought to be moved down"; |
| |
| post_error (msg1, gnat_field); |
| post_error_ne (msg2, gnat_field, gnat_field); |
| post_error (msg3, gnat_field); |
| } |
| |
| /* Likewise but for every field present on GNU_FIELD_LIST. */ |
| |
| static void |
| warn_on_list_placement (tree gnu_field_list, Node_Id gnat_component_list, |
| Entity_Id gnat_record_type, bool in_variant, |
| bool do_reorder) |
| { |
| for (tree gnu_tmp = gnu_field_list; gnu_tmp; gnu_tmp = DECL_CHAIN (gnu_tmp)) |
| warn_on_field_placement (gnu_tmp, gnat_component_list, gnat_record_type, |
| in_variant, do_reorder); |
| } |
| |
| /* Structure holding information for a given variant. */ |
| typedef struct vinfo |
| { |
| /* The record type of the variant. */ |
| tree type; |
| |
| /* The name of the variant. */ |
| tree name; |
| |
| /* The qualifier of the variant. */ |
| tree qual; |
| |
| /* Whether the variant has a rep clause. */ |
| bool has_rep; |
| |
| /* Whether the variant is packed. */ |
| bool packed; |
| |
| } vinfo_t; |
| |
| /* Translate and chain GNAT_COMPONENT_LIST present in GNAT_RECORD_TYPE to |
| GNU_FIELD_LIST, set the result as the field list of GNU_RECORD_TYPE and |
| finish it up. Return true if GNU_RECORD_TYPE has a rep clause that affects |
| the layout (see below). When called from gnat_to_gnu_entity during the |
| processing of a record definition, the GCC node for the parent, if any, |
| will be the single field of GNU_RECORD_TYPE and the GCC nodes for the |
| discriminants will be on GNU_FIELD_LIST. The other call to this function |
| is a recursive call for the component list of a variant and, in this case, |
| GNU_FIELD_LIST is empty. |
| |
| PACKED is 1 if this is for a packed record or -1 if this is for a record |
| with Component_Alignment of Storage_Unit. |
| |
| DEFINITION is true if we are defining this record type. |
| |
| CANCEL_ALIGNMENT is true if the alignment should be zeroed before laying |
| out the record. This means the alignment only serves to force fields to |
| be bitfields, but not to require the record to be that aligned. This is |
| used for variants. |
| |
| ALL_REP is true if a rep clause is present for all the fields. |
| |
| UNCHECKED_UNION is true if we are building this type for a record with a |
| Pragma Unchecked_Union. |
| |
| ARTIFICIAL is true if this is a type that was generated by the compiler. |
| |
| DEBUG_INFO is true if we need to write debug information about the type. |
| |
| MAYBE_UNUSED is true if this type may be unused in the end; this doesn't |
| mean that its contents may be unused as well, only the container itself. |
| |
| FIRST_FREE_POS, if nonzero, is the first (lowest) free field position in |
| the outer record type down to this variant level. It is nonzero only if |
| all the fields down to this level have a rep clause and ALL_REP is false. |
| |
| P_GNU_REP_LIST, if nonzero, is a pointer to a list to which each field |
| with a rep clause is to be added; in this case, that is all that should |
| be done with such fields and the return value will be false. */ |
| |
| static bool |
| components_to_record (Node_Id gnat_component_list, Entity_Id gnat_record_type, |
| tree gnu_field_list, tree gnu_record_type, int packed, |
| bool definition, bool cancel_alignment, bool all_rep, |
| bool unchecked_union, bool artificial, bool debug_info, |
| bool maybe_unused, tree first_free_pos, |
| tree *p_gnu_rep_list) |
| { |
| const bool needs_xv_encodings |
| = debug_info && gnat_encodings != DWARF_GNAT_ENCODINGS_MINIMAL; |
| bool all_rep_and_size = all_rep && TYPE_SIZE (gnu_record_type); |
| bool variants_have_rep = all_rep; |
| bool layout_with_rep = false; |
| bool has_self_field = false; |
| bool has_aliased_after_self_field = false; |
| Entity_Id gnat_component_decl, gnat_variant_part; |
| tree gnu_field, gnu_next, gnu_last; |
| tree gnu_variant_part = NULL_TREE; |
| tree gnu_rep_list = NULL_TREE; |
| |
| /* For each component referenced in a component declaration create a GCC |
| field and add it to the list, skipping pragmas in the GNAT list. */ |
| gnu_last = tree_last (gnu_field_list); |
| if (Present (Component_Items (gnat_component_list))) |
| for (gnat_component_decl |
| = First_Non_Pragma (Component_Items (gnat_component_list)); |
| Present (gnat_component_decl); |
| gnat_component_decl = Next_Non_Pragma (gnat_component_decl)) |
| { |
| Entity_Id gnat_field = Defining_Entity (gnat_component_decl); |
| Name_Id gnat_name = Chars (gnat_field); |
| |
| /* If present, the _Parent field must have been created as the single |
| field of the record type. Put it before any other fields. */ |
| if (gnat_name == Name_uParent) |
| { |
| gnu_field = TYPE_FIELDS (gnu_record_type); |
| gnu_field_list = chainon (gnu_field_list, gnu_field); |
| } |
| else |
| { |
| gnu_field = gnat_to_gnu_field (gnat_field, gnu_record_type, packed, |
| definition, debug_info); |
| |
| /* If this is the _Tag field, put it before any other fields. */ |
| if (gnat_name == Name_uTag) |
| gnu_field_list = chainon (gnu_field_list, gnu_field); |
| |
| /* If this is the _Controller field, put it before the other |
| fields except for the _Tag or _Parent field. */ |
| else if (gnat_name == Name_uController && gnu_last) |
| { |
| DECL_CHAIN (gnu_field) = DECL_CHAIN (gnu_last); |
| DECL_CHAIN (gnu_last) = gnu_field; |
| } |
| |
| /* If this is a regular field, put it after the other fields. */ |
| else |
| { |
| DECL_CHAIN (gnu_field) = gnu_field_list; |
| gnu_field_list = gnu_field; |
| if (!gnu_last) |
| gnu_last = gnu_field; |
| |
| /* And record information for the final layout. */ |
| if (field_has_self_size (gnu_field)) |
| has_self_field = true; |
| else if (has_self_field && DECL_ALIASED_P (gnu_field)) |
| has_aliased_after_self_field = true; |
| } |
| } |
| |
| save_gnu_tree (gnat_field, gnu_field, false); |
| } |
| |
| /* At the end of the component list there may be a variant part. */ |
| gnat_variant_part = Variant_Part (gnat_component_list); |
| |
| /* We create a QUAL_UNION_TYPE for the variant part since the variants are |
| mutually exclusive and should go in the same memory. To do this we need |
| to treat each variant as a record whose elements are created from the |
| component list for the variant. So here we create the records from the |
| lists for the variants and put them all into the QUAL_UNION_TYPE. |
| If this is an Unchecked_Union, we make a UNION_TYPE instead or |
| use GNU_RECORD_TYPE if there are no fields so far. */ |
| if (Present (gnat_variant_part)) |
| { |
| Node_Id gnat_discr = Name (gnat_variant_part), variant; |
| tree gnu_discr = gnat_to_gnu (gnat_discr); |
| tree gnu_name = TYPE_IDENTIFIER (gnu_record_type); |
| tree gnu_var_name |
| = concat_name (get_identifier (Get_Name_String (Chars (gnat_discr))), |
| "XVN"); |
| tree gnu_union_name |
| = concat_name (gnu_name, IDENTIFIER_POINTER (gnu_var_name)); |
| tree gnu_union_type; |
| tree this_first_free_pos, gnu_variant_list = NULL_TREE; |
| bool union_field_needs_strict_alignment = false; |
| auto_vec <vinfo_t, 16> variant_types; |
| vinfo_t *gnu_variant; |
| unsigned int variants_align = 0; |
| unsigned int i; |
| |
| /* Reuse the enclosing union if this is an Unchecked_Union whose fields |
| are all in the variant part, to match the layout of C unions. There |
| is an associated check below. */ |
| if (TREE_CODE (gnu_record_type) == UNION_TYPE) |
| gnu_union_type = gnu_record_type; |
| else |
| { |
| gnu_union_type |
| = make_node (unchecked_union ? UNION_TYPE : QUAL_UNION_TYPE); |
| |
| TYPE_NAME (gnu_union_type) = gnu_union_name; |
| SET_TYPE_ALIGN (gnu_union_type, 0); |
| TYPE_PACKED (gnu_union_type) = TYPE_PACKED (gnu_record_type); |
| TYPE_REVERSE_STORAGE_ORDER (gnu_union_type) |
| = TYPE_REVERSE_STORAGE_ORDER (gnu_record_type); |
| } |
| |
| /* If all the fields down to this level have a rep clause, find out |
| whether all the fields at this level also have one. If so, then |
| compute the new first free position to be passed downward. */ |
| this_first_free_pos = first_free_pos; |
| if (this_first_free_pos) |
| { |
| for (gnu_field = gnu_field_list; |
| gnu_field; |
| gnu_field = DECL_CHAIN (gnu_field)) |
| if (DECL_FIELD_OFFSET (gnu_field)) |
| { |
| tree pos = bit_position (gnu_field); |
| if (!tree_int_cst_lt (pos, this_first_free_pos)) |
| this_first_free_pos |
| = size_binop (PLUS_EXPR, pos, DECL_SIZE (gnu_field)); |
| } |
| else |
| { |
| this_first_free_pos = NULL_TREE; |
| break; |
| } |
| } |
| |
| /* We build the variants in two passes. The bulk of the work is done in |
| the first pass, that is to say translating the GNAT nodes, building |
| the container types and computing the associated properties. However |
| we cannot finish up the container types during this pass because we |
| don't know where the variant part will be placed until the end. */ |
| for (variant = First_Non_Pragma (Variants (gnat_variant_part)); |
| Present (variant); |
| variant = Next_Non_Pragma (variant)) |
| { |
| tree gnu_variant_type = make_node (RECORD_TYPE); |
| tree gnu_inner_name, gnu_qual; |
| bool has_rep; |
| int field_packed; |
| vinfo_t vinfo; |
| |
| Get_Variant_Encoding (variant); |
| gnu_inner_name = get_identifier_with_length (Name_Buffer, Name_Len); |
| TYPE_NAME (gnu_variant_type) |
| = concat_name (gnu_union_name, |
| IDENTIFIER_POINTER (gnu_inner_name)); |
| |
| /* Set the alignment of the inner type in case we need to make |
| inner objects into bitfields, but then clear it out so the |
| record actually gets only the alignment required. */ |
| SET_TYPE_ALIGN (gnu_variant_type, TYPE_ALIGN (gnu_record_type)); |
| TYPE_PACKED (gnu_variant_type) = TYPE_PACKED (gnu_record_type); |
| TYPE_REVERSE_STORAGE_ORDER (gnu_variant_type) |
| = TYPE_REVERSE_STORAGE_ORDER (gnu_record_type); |
| |
| /* Similarly, if the outer record has a size specified and all |
| the fields have a rep clause, we can propagate the size. */ |
| if (all_rep_and_size) |
| { |
| TYPE_SIZE (gnu_variant_type) = TYPE_SIZE (gnu_record_type); |
| TYPE_SIZE_UNIT (gnu_variant_type) |
| = TYPE_SIZE_UNIT (gnu_record_type); |
| } |
| |
| /* Add the fields into the record type for the variant. Note that |
| we aren't sure to really use it at this point, see below. */ |
| has_rep |
| = components_to_record (Component_List (variant), gnat_record_type, |
| NULL_TREE, gnu_variant_type, packed, |
| definition, !all_rep_and_size, all_rep, |
| unchecked_union, true, needs_xv_encodings, |
| true, this_first_free_pos, |
| all_rep || this_first_free_pos |
| ? NULL : &gnu_rep_list); |
| |
| /* Translate the qualifier and annotate the GNAT node. */ |
| gnu_qual = choices_to_gnu (gnu_discr, Discrete_Choices (variant)); |
| Set_Present_Expr (variant, annotate_value (gnu_qual)); |
| |
| /* Deal with packedness like in gnat_to_gnu_field. */ |
| if (components_need_strict_alignment (Component_List (variant))) |
| { |
| field_packed = 0; |
| union_field_needs_strict_alignment = true; |
| } |
| else |
| field_packed |
| = adjust_packed (gnu_variant_type, gnu_record_type, packed); |
| |
| /* Push this variant onto the stack for the second pass. */ |
| vinfo.type = gnu_variant_type; |
| vinfo.name = gnu_inner_name; |
| vinfo.qual = gnu_qual; |
| vinfo.has_rep = has_rep; |
| vinfo.packed = field_packed; |
| variant_types.safe_push (vinfo); |
| |
| /* Compute the global properties that will determine the placement of |
| the variant part. */ |
| variants_have_rep |= has_rep; |
| if (!field_packed && TYPE_ALIGN (gnu_variant_type) > variants_align) |
| variants_align = TYPE_ALIGN (gnu_variant_type); |
| } |
| |
| /* Round up the first free position to the alignment of the variant part |
| for the variants without rep clause. This will guarantee a consistent |
| layout independently of the placement of the variant part. */ |
| if (variants_have_rep && variants_align > 0 && this_first_free_pos) |
| this_first_free_pos = round_up (this_first_free_pos, variants_align); |
| |
| /* In the second pass, the container types are adjusted if necessary and |
| finished up, then the corresponding fields of the variant part are |
| built with their qualifier, unless this is an unchecked union. */ |
| FOR_EACH_VEC_ELT (variant_types, i, gnu_variant) |
| { |
| tree gnu_variant_type = gnu_variant->type; |
| tree gnu_field_list = TYPE_FIELDS (gnu_variant_type); |
| |
| /* If this is an Unchecked_Union whose fields are all in the variant |
| part and we have a single field with no representation clause or |
| placed at offset zero, use the field directly to match the layout |
| of C unions. */ |
| if (TREE_CODE (gnu_record_type) == UNION_TYPE |
| && gnu_field_list |
| && !DECL_CHAIN (gnu_field_list) |
| && (!DECL_FIELD_OFFSET (gnu_field_list) |
| || integer_zerop (bit_position (gnu_field_list)))) |
| { |
| gnu_field = gnu_field_list; |
| DECL_CONTEXT (gnu_field) = gnu_record_type; |
| } |
| else |
| { |
| /* Finalize the variant type now. We used to throw away empty |
| record types but we no longer do that because we need them to |
| generate complete debug info for the variant; otherwise, the |
| union type definition will be lacking the fields associated |
| with these empty variants. */ |
| if (gnu_field_list && variants_have_rep && !gnu_variant->has_rep) |
| { |
| /* The variant part will be at offset 0 so we need to ensure |
| that the fields are laid out starting from the first free |
| position at this level. */ |
| tree gnu_rep_type = make_node (RECORD_TYPE); |
| tree gnu_rep_part; |
| TYPE_REVERSE_STORAGE_ORDER (gnu_rep_type) |
| = TYPE_REVERSE_STORAGE_ORDER (gnu_variant_type); |
| finish_record_type (gnu_rep_type, NULL_TREE, 0, debug_info); |
| gnu_rep_part |
| = create_rep_part (gnu_rep_type, gnu_variant_type, |
| this_first_free_pos); |
| DECL_CHAIN (gnu_rep_part) = gnu_field_list; |
| gnu_field_list = gnu_rep_part; |
| finish_record_type (gnu_variant_type, gnu_field_list, 0, |
| false); |
| } |
| |
| if (debug_info) |
| rest_of_record_type_compilation (gnu_variant_type); |
| create_type_decl (TYPE_NAME (gnu_variant_type), gnu_variant_type, |
| true, needs_xv_encodings, gnat_component_list); |
| |
| gnu_field |
| = create_field_decl (gnu_variant->name, gnu_variant_type, |
| gnu_union_type, |
| all_rep_and_size |
| ? TYPE_SIZE (gnu_variant_type) : 0, |
| variants_have_rep ? bitsize_zero_node : 0, |
| gnu_variant->packed, 0); |
| |
| DECL_INTERNAL_P (gnu_field) = 1; |
| |
| if (!unchecked_union) |
| DECL_QUALIFIER (gnu_field) = gnu_variant->qual; |
| } |
| |
| DECL_CHAIN (gnu_field) = gnu_variant_list; |
| gnu_variant_list = gnu_field; |
| } |
| |
| /* Only make the QUAL_UNION_TYPE if there are non-empty variants. */ |
| if (gnu_variant_list) |
| { |
| int union_field_packed; |
| |
| if (all_rep_and_size) |
| { |
| TYPE_SIZE (gnu_union_type) = TYPE_SIZE (gnu_record_type); |
| TYPE_SIZE_UNIT (gnu_union_type) |
| = TYPE_SIZE_UNIT (gnu_record_type); |
| } |
| |
| finish_record_type (gnu_union_type, nreverse (gnu_variant_list), |
| all_rep_and_size ? 1 : 0, needs_xv_encodings); |
| |
| /* If GNU_UNION_TYPE is our record type, it means we must have an |
| Unchecked_Union with no fields. Verify that and, if so, just |
| return. */ |
| if (gnu_union_type == gnu_record_type) |
| { |
| gcc_assert (unchecked_union |
| && !gnu_field_list |
| && !gnu_rep_list); |
| return variants_have_rep; |
| } |
| |
| create_type_decl (TYPE_NAME (gnu_union_type), gnu_union_type, true, |
| needs_xv_encodings, gnat_component_list); |
| |
| /* Deal with packedness like in gnat_to_gnu_field. */ |
| if (union_field_needs_strict_alignment) |
| union_field_packed = 0; |
| else |
| union_field_packed |
| = adjust_packed (gnu_union_type, gnu_record_type, packed); |
| |
| gnu_variant_part |
| = create_field_decl (gnu_var_name, gnu_union_type, gnu_record_type, |
| all_rep_and_size |
| ? TYPE_SIZE (gnu_union_type) : 0, |
| variants_have_rep ? bitsize_zero_node : 0, |
| union_field_packed, 0); |
| |
| DECL_INTERNAL_P (gnu_variant_part) = 1; |
| } |
| } |
| |
| /* Scan GNU_FIELD_LIST and see if any fields have rep clauses. If they do, |
| pull them out and put them onto the appropriate list. |
| |
| Similarly, pull out the fields with zero size and no rep clause, as they |
| would otherwise modify the layout and thus very likely run afoul of the |
| Ada semantics, which are different from those of C here. |
| |
| Finally, if there is an aliased field placed in the list after fields |
| with self-referential size, pull out the latter in the same way. |
| |
| Optionally, if the reordering mechanism is enabled, pull out the fields |
| with self-referential size, variable size and fixed size not a multiple |
| of a byte, so that they don't cause the regular fields to be either at |
| self-referential/variable offset or misaligned. Note, in the latter |
| case, that this can only happen in packed record types so the alignment |
| is effectively capped to the byte for the whole record. But we don't |
| do it for non-packed record types if pragma Optimize_Alignment (Space) |
| is specified because this can prevent alignment gaps from being filled. |
| |
| Optionally, if the layout warning is enabled, keep track of the above 4 |
| different kinds of fields and issue a warning if some of them would be |
| (or are being) reordered by the reordering mechanism. |
| |
| ??? If we reorder fields, the debugging information will be affected and |
| the debugger print fields in a different order from the source code. */ |
| const bool do_reorder |
| = (Convention (gnat_record_type) == Convention_Ada |
| && !No_Reordering (gnat_record_type) |
| && (!Optimize_Alignment_Space (gnat_record_type) |
| || Is_Packed (gnat_record_type)) |
| && !debug__debug_flag_dot_r); |
| const bool w_reorder |
| = (Convention (gnat_record_type) == Convention_Ada |
| && Warn_On_Questionable_Layout |
| && !(No_Reordering (gnat_record_type) && GNAT_Mode)); |
| const bool in_variant = (p_gnu_rep_list != NULL); |
| tree gnu_zero_list = NULL_TREE; |
| tree gnu_self_list = NULL_TREE; |
| tree gnu_var_list = NULL_TREE; |
| tree gnu_bitp_list = NULL_TREE; |
| tree gnu_tmp_bitp_list = NULL_TREE; |
| unsigned int tmp_bitp_size = 0; |
| unsigned int last_reorder_field_type = -1; |
| unsigned int tmp_last_reorder_field_type = -1; |
| |
| #define MOVE_FROM_FIELD_LIST_TO(LIST) \ |
| do { \ |
| if (gnu_last) \ |
| DECL_CHAIN (gnu_last) = gnu_next; \ |
| else \ |
| gnu_field_list = gnu_next; \ |
| \ |
| DECL_CHAIN (gnu_field) = (LIST); \ |
| (LIST) = gnu_field; \ |
| } while (0) |
| |
| gnu_last = NULL_TREE; |
| for (gnu_field = gnu_field_list; gnu_field; gnu_field = gnu_next) |
| { |
| gnu_next = DECL_CHAIN (gnu_field); |
| |
| if (DECL_FIELD_OFFSET (gnu_field)) |
| { |
| MOVE_FROM_FIELD_LIST_TO (gnu_rep_list); |
| continue; |
| } |
| |
| if (DECL_SIZE (gnu_field) && integer_zerop (DECL_SIZE (gnu_field))) |
| { |
| DECL_FIELD_OFFSET (gnu_field) = size_zero_node; |
| SET_DECL_OFFSET_ALIGN (gnu_field, BIGGEST_ALIGNMENT); |
| DECL_FIELD_BIT_OFFSET (gnu_field) = bitsize_zero_node; |
| if (DECL_ALIASED_P (gnu_field)) |
| SET_TYPE_ALIGN (gnu_record_type, |
| MAX (TYPE_ALIGN (gnu_record_type), |
| TYPE_ALIGN (TREE_TYPE (gnu_field)))); |
| MOVE_FROM_FIELD_LIST_TO (gnu_zero_list); |
| continue; |
| } |
| |
| if (has_aliased_after_self_field && field_has_self_size (gnu_field)) |
| { |
| MOVE_FROM_FIELD_LIST_TO (gnu_self_list); |
| continue; |
| } |
| |
| /* We don't need further processing in default mode. */ |
| if (!w_reorder && !do_reorder) |
| { |
| gnu_last = gnu_field; |
| continue; |
| } |
| |
| if (field_has_self_size (gnu_field)) |
| { |
| if (w_reorder) |
| { |
| if (last_reorder_field_type < 4) |
| warn_on_field_placement (gnu_field, gnat_component_list, |
| gnat_record_type, in_variant, |
| do_reorder); |
| else |
| last_reorder_field_type = 4; |
| } |
| |
| if (do_reorder) |
| { |
| MOVE_FROM_FIELD_LIST_TO (gnu_self_list); |
| continue; |
| } |
| } |
| |
| else if (field_has_variable_size (gnu_field)) |
| { |
| if (w_reorder) |
| { |
| if (last_reorder_field_type < 3) |
| warn_on_field_placement (gnu_field, gnat_component_list, |
| gnat_record_type, in_variant, |
| do_reorder); |
| else |
| last_reorder_field_type = 3; |
| } |
| |
| if (do_reorder) |
| { |
| MOVE_FROM_FIELD_LIST_TO (gnu_var_list); |
| continue; |
| } |
| } |
| |
| else |
| { |
| /* If the field has no size, then it cannot be bit-packed. */ |
| const unsigned int bitp_size |
| = DECL_SIZE (gnu_field) |
| ? TREE_INT_CST_LOW (DECL_SIZE (gnu_field)) % BITS_PER_UNIT |
| : 0; |
| |
| /* If the field is bit-packed, we move it to a temporary list that |
| contains the contiguously preceding bit-packed fields, because |
| we want to be able to put them back if the misalignment happens |
| to cancel itself after several bit-packed fields. */ |
| if (bitp_size != 0) |
| { |
| tmp_bitp_size = (tmp_bitp_size + bitp_size) % BITS_PER_UNIT; |
| |
| if (last_reorder_field_type != 2) |
| { |
| tmp_last_reorder_field_type = last_reorder_field_type; |
| last_reorder_field_type = 2; |
| } |
| |
| if (do_reorder) |
| { |
| MOVE_FROM_FIELD_LIST_TO (gnu_tmp_bitp_list); |
| continue; |
| } |
| } |
| |
| /* No more bit-packed fields, move the existing ones to the end or |
| put them back at their original location. */ |
| else if (last_reorder_field_type == 2 || gnu_tmp_bitp_list) |
| { |
| last_reorder_field_type = 1; |
| |
| if (tmp_bitp_size != 0) |
| { |
| if (w_reorder && tmp_last_reorder_field_type < 2) |
| { |
| if (gnu_tmp_bitp_list) |
| warn_on_list_placement (gnu_tmp_bitp_list, |
| gnat_component_list, |
| gnat_record_type, in_variant, |
| do_reorder); |
| else |
| warn_on_field_placement (gnu_last, |
| gnat_component_list, |
| gnat_record_type, in_variant, |
| do_reorder); |
| } |
| |
| if (do_reorder) |
| gnu_bitp_list = chainon (gnu_tmp_bitp_list, gnu_bitp_list); |
| |
| gnu_tmp_bitp_list = NULL_TREE; |
| tmp_bitp_size = 0; |
| } |
| else |
| { |
| /* Rechain the temporary list in front of GNU_FIELD. */ |
| tree gnu_bitp_field = gnu_field; |
| while (gnu_tmp_bitp_list) |
| { |
| tree gnu_bitp_next = DECL_CHAIN (gnu_tmp_bitp_list); |
| DECL_CHAIN (gnu_tmp_bitp_list) = gnu_bitp_field; |
| if (gnu_last) |
| DECL_CHAIN (gnu_last) = gnu_tmp_bitp_list; |
| else |
| gnu_field_list = gnu_tmp_bitp_list; |
| gnu_bitp_field = gnu_tmp_bitp_list; |
| gnu_tmp_bitp_list = gnu_bitp_next; |
| } |
| } |
| } |
| |
| else |
| last_reorder_field_type = 1; |
| } |
| |
| gnu_last = gnu_field; |
| } |
| |
| #undef MOVE_FROM_FIELD_LIST_TO |
| |
| gnu_field_list = nreverse (gnu_field_list); |
| |
| /* If permitted, we reorder the fields as follows: |
| |
| 1) all (groups of) fields whose length is fixed and multiple of a byte, |
| 2) the remaining fields whose length is fixed and not multiple of a byte, |
| 3) the remaining fields whose length doesn't depend on discriminants, |
| 4) all fields whose length depends on discriminants, |
| 5) the variant part, |
| |
| within the record and within each variant recursively. */ |
| |
| if (w_reorder) |
| { |
| /* If we have pending bit-packed fields, warn if they would be moved |
| to after regular fields. */ |
| if (last_reorder_field_type == 2 |
| && tmp_bitp_size != 0 |
| && tmp_last_reorder_field_type < 2) |
| { |
| if (gnu_tmp_bitp_list) |
| warn_on_list_placement (gnu_tmp_bitp_list, |
| gnat_component_list, gnat_record_type, |
| in_variant, do_reorder); |
| else |
| warn_on_field_placement (gnu_field_list, |
| gnat_component_list, gnat_record_type, |
| in_variant, do_reorder); |
| } |
| } |
| |
| if (do_reorder) |
| { |
| /* If we have pending bit-packed fields on the temporary list, we put |
| them either on the bit-packed list or back on the regular list. */ |
| if (gnu_tmp_bitp_list) |
| { |
| if (tmp_bitp_size != 0) |
| gnu_bitp_list = chainon (gnu_tmp_bitp_list, gnu_bitp_list); |
| else |
| gnu_field_list = chainon (gnu_tmp_bitp_list, gnu_field_list); |
| } |
| |
| gnu_field_list |
| = chainon (gnu_field_list, |
| chainon (gnu_bitp_list, |
| chainon (gnu_var_list, gnu_self_list))); |
| } |
| |
| /* Otherwise, if there is an aliased field placed after a field whose length |
| depends on discriminants, we put all the fields of the latter sort, last. |
| We need to do this in case an object of this record type is mutable. */ |
| else if (has_aliased_after_self_field) |
| gnu_field_list = chainon (gnu_field_list, gnu_self_list); |
| |
| /* If P_REP_LIST is nonzero, this means that we are asked to move the fields |
| in our REP list to the previous level because this level needs them in |
| order to do a correct layout, i.e. avoid having overlapping fields. */ |
| if (p_gnu_rep_list && gnu_rep_list) |
| *p_gnu_rep_list = chainon (*p_gnu_rep_list, gnu_rep_list); |
| |
| /* Deal with the annoying case of an extension of a record with variable size |
| and partial rep clause, for which the _Parent field is forced at offset 0 |
| and has variable size, which we do not support below. Note that we cannot |
| do it if the field has fixed size because we rely on the presence of the |
| REP part built below to trigger the reordering of the fields in a derived |
| record type when all the fields have a fixed position. */ |
| else if (gnu_rep_list |
| && !DECL_CHAIN (gnu_rep_list) |
| && TREE_CODE (DECL_SIZE (gnu_rep_list)) != INTEGER_CST |
| && !variants_have_rep |
| && first_free_pos |
| && integer_zerop (first_free_pos) |
| && integer_zerop (bit_position (gnu_rep_list))) |
| { |
| DECL_CHAIN (gnu_rep_list) = gnu_field_list; |
| gnu_field_list = gnu_rep_list; |
| gnu_rep_list = NULL_TREE; |
| } |
| |
| /* Otherwise, sort the fields by bit position and put them into their own |
| record, before the others, if we also have fields without rep clause. */ |
| else if (gnu_rep_list) |
| { |
| tree gnu_rep_type, gnu_rep_part; |
| int i, len = list_length (gnu_rep_list); |
| tree *gnu_arr = XALLOCAVEC (tree, len); |
| |
| /* If all the fields have a rep clause, we can do a flat layout. */ |
| layout_with_rep = !gnu_field_list |
| && (!gnu_variant_part || variants_have_rep); |
| gnu_rep_type |
| = layout_with_rep ? gnu_record_type : make_node (RECORD_TYPE); |
| |
| for (gnu_field = gnu_rep_list, i = 0; |
| gnu_field; |
| gnu_field = DECL_CHAIN (gnu_field), i++) |
| gnu_arr[i] = gnu_field; |
| |
| qsort (gnu_arr, len, sizeof (tree), compare_field_bitpos); |
| |
| /* Put the fields in the list in order of increasing position, which |
| means we start from the end. */ |
| gnu_rep_list = NULL_TREE; |
| for (i = len - 1; i >= 0; i--) |
| { |
| DECL_CHAIN (gnu_arr[i]) = gnu_rep_list; |
| gnu_rep_list = gnu_arr[i]; |
| DECL_CONTEXT (gnu_arr[i]) = gnu_rep_type; |
| } |
| |
| if (layout_with_rep) |
| gnu_field_list = gnu_rep_list; |
| else |
| { |
| TYPE_REVERSE_STORAGE_ORDER (gnu_rep_type) |
| = TYPE_REVERSE_STORAGE_ORDER (gnu_record_type); |
| finish_record_type (gnu_rep_type, gnu_rep_list, 1, debug_info); |
| |
| /* If FIRST_FREE_POS is nonzero, we need to ensure that the fields |
| without rep clause are laid out starting from this position. |
| Therefore, we force it as a minimal size on the REP part. */ |
| gnu_rep_part |
| = create_rep_part (gnu_rep_type, gnu_record_type, first_free_pos); |
| |
| /* Chain the REP part at the beginning of the field list. */ |
| DECL_CHAIN (gnu_rep_part) = gnu_field_list; |
| gnu_field_list = gnu_rep_part; |
| } |
| } |
| |
| /* Chain the variant part at the end of the field list. */ |
| if (gnu_variant_part) |
| gnu_field_list = chainon (gnu_field_list, gnu_variant_part); |
| |
| if (cancel_alignment) |
| SET_TYPE_ALIGN (gnu_record_type, 0); |
| |
| TYPE_ARTIFICIAL (gnu_record_type) = artificial; |
| |
| finish_record_type (gnu_record_type, gnu_field_list, layout_with_rep ? 1 : 0, |
| debug_info && !maybe_unused); |
| |
| /* Chain the fields with zero size at the beginning of the field list. */ |
| if (gnu_zero_list) |
| TYPE_FIELDS (gnu_record_type) |
| = chainon (gnu_zero_list, TYPE_FIELDS (gnu_record_type)); |
| |
| return (gnu_rep_list && !p_gnu_rep_list) || variants_have_rep; |
| } |
| |
| /* Given GNU_SIZE, a GCC tree representing a size, return a Uint to be |
| placed into an Esize, Component_Bit_Offset, or Component_Size value |
| in the GNAT tree. */ |
| |
| static Uint |
| annotate_value (tree gnu_size) |
| { |
| static int var_count = 0; |
| TCode tcode; |
| Node_Ref_Or_Val ops[3] = { No_Uint, No_Uint, No_Uint }; |
| struct tree_int_map in; |
| |
| /* See if we've already saved the value for this node. */ |
| if (EXPR_P (gnu_size) || DECL_P (gnu_size)) |
| { |
| struct tree_int_map *e; |
| |
| in.base.from = gnu_size; |
| e = annotate_value_cache->find (&in); |
| |
| if (e) |
| return (Node_Ref_Or_Val) e->to; |
| } |
| else |
| in.base.from = NULL_TREE; |
| |
| /* If we do not return inside this switch, TCODE will be set to the |
| code to be used in a call to Create_Node. */ |
| switch (TREE_CODE (gnu_size)) |
| { |
| case INTEGER_CST: |
| /* For negative values, build NEGATE_EXPR of the opposite. Such values |
| can appear for discriminants in expressions for variants. */ |
| if (tree_int_cst_sgn (gnu_size) < 0) |
| { |
| tree t = wide_int_to_tree (sizetype, -wi::to_wide (gnu_size)); |
| tcode = Negate_Expr; |
| ops[0] = UI_From_gnu (t); |
| } |
| else |
| return TREE_OVERFLOW (gnu_size) ? No_Uint : UI_From_gnu (gnu_size); |
| break; |
| |
| case COMPONENT_REF: |
| /* The only case we handle here is a simple discriminant reference. */ |
| if (DECL_DISCRIMINANT_NUMBER (TREE_OPERAND (gnu_size, 1))) |
| { |
| tree ref = gnu_size; |
| gnu_size = TREE_OPERAND (ref, 1); |
| |
| /* Climb up the chain of successive extensions, if any. */ |
| while (TREE_CODE (TREE_OPERAND (ref, 0)) == COMPONENT_REF |
| && DECL_NAME (TREE_OPERAND (TREE_OPERAND (ref, 0), 1)) |
| == parent_name_id) |
| ref = TREE_OPERAND (ref, 0); |
| |
| if (TREE_CODE (TREE_OPERAND (ref, 0)) == PLACEHOLDER_EXPR) |
| { |
| /* Fall through to common processing as a FIELD_DECL. */ |
| tcode = Discrim_Val; |
| ops[0] = UI_From_gnu (DECL_DISCRIMINANT_NUMBER (gnu_size)); |
| } |
| else |
| return No_Uint; |
| } |
| else |
| return No_Uint; |
| break; |
| |
| case VAR_DECL: |
| tcode = Dynamic_Val; |
| ops[0] = UI_From_Int (++var_count); |
| break; |
| |
| CASE_CONVERT: |
| case NON_LVALUE_EXPR: |
| return annotate_value (TREE_OPERAND (gnu_size, 0)); |
| |
| /* Now just list the operations we handle. */ |
| case COND_EXPR: tcode = Cond_Expr; break; |
| case MINUS_EXPR: tcode = Minus_Expr; break; |
| case TRUNC_DIV_EXPR: tcode = Trunc_Div_Expr; break; |
| case CEIL_DIV_EXPR: tcode = Ceil_Div_Expr; break; |
| case FLOOR_DIV_EXPR: tcode = Floor_Div_Expr; break; |
| case TRUNC_MOD_EXPR: tcode = Trunc_Mod_Expr; break; |
| case CEIL_MOD_EXPR: tcode = Ceil_Mod_Expr; break; |
| case FLOOR_MOD_EXPR: tcode = Floor_Mod_Expr; break; |
| case EXACT_DIV_EXPR: tcode = Exact_Div_Expr; break; |
| case NEGATE_EXPR: tcode = Negate_Expr; break; |
| case MIN_EXPR: tcode = Min_Expr; break; |
| case MAX_EXPR: tcode = Max_Expr; break; |
| case ABS_EXPR: tcode = Abs_Expr; break; |
| case TRUTH_ANDIF_EXPR: |
| case TRUTH_AND_EXPR: tcode = Truth_And_Expr; break; |
| case TRUTH_ORIF_EXPR: |
| case TRUTH_OR_EXPR: tcode = Truth_Or_Expr; break; |
| case TRUTH_XOR_EXPR: tcode = Truth_Xor_Expr; break; |
| case TRUTH_NOT_EXPR: tcode = Truth_Not_Expr; break; |
| case LT_EXPR: tcode = Lt_Expr; break; |
| case LE_EXPR: tcode = Le_Expr; break; |
| case GT_EXPR: tcode = Gt_Expr; break; |
| case GE_EXPR: tcode = Ge_Expr; break; |
| case EQ_EXPR: tcode = Eq_Expr; break; |
| case NE_EXPR: tcode = Ne_Expr; break; |
| |
| case MULT_EXPR: |
| case PLUS_EXPR: |
| tcode = (TREE_CODE (gnu_size) == MULT_EXPR ? Mult_Expr : Plus_Expr); |
| /* Fold conversions from bytes to bits into inner operations. */ |
| if (TREE_CODE (TREE_OPERAND (gnu_size, 1)) == INTEGER_CST |
| && CONVERT_EXPR_P (TREE_OPERAND (gnu_size, 0))) |
| { |
| tree inner_op = TREE_OPERAND (TREE_OPERAND (gnu_size, 0), 0); |
| if (TREE_CODE (inner_op) == TREE_CODE (gnu_size) |
| && TREE_CODE (TREE_OPERAND (inner_op, 1)) == INTEGER_CST) |
| { |
| tree inner_op_op1 = TREE_OPERAND (inner_op, 1); |
| tree gnu_size_op1 = TREE_OPERAND (gnu_size, 1); |
| widest_int op1; |
| if (TREE_CODE (gnu_size) == MULT_EXPR) |
| op1 = (wi::to_widest (inner_op_op1) |
| * wi::to_widest (gnu_size_op1)); |
| else |
| op1 = (wi::to_widest (inner_op_op1) |
| + wi::to_widest (gnu_size_op1)); |
| ops[1] = UI_From_gnu (wide_int_to_tree (sizetype, op1)); |
| ops[0] = annotate_value (TREE_OPERAND (inner_op, 0)); |
| } |
| } |
| break; |
| |
| case BIT_AND_EXPR: |
| tcode = Bit_And_Expr; |
| /* For negative values in sizetype, build NEGATE_EXPR of the opposite. |
| Such values appear in expressions with aligning patterns. Note that, |
| since sizetype is unsigned, we have to jump through some hoops. */ |
| if (TREE_CODE (TREE_OPERAND (gnu_size, 1)) == INTEGER_CST) |
| { |
| tree op1 = TREE_OPERAND (gnu_size, 1); |
| wide_int signed_op1 = wi::sext (wi::to_wide (op1), |
| TYPE_PRECISION (sizetype)); |
| if (wi::neg_p (signed_op1)) |
| { |
| op1 = wide_int_to_tree (sizetype, wi::neg (signed_op1)); |
| ops[1] = annotate_value (build1 (NEGATE_EXPR, sizetype, op1)); |
| } |
| } |
| break; |
| |
| case CALL_EXPR: |
| /* In regular mode, inline back only if symbolic annotation is requested |
| in order to avoid memory explosion on big discriminated record types. |
| But not in ASIS mode, as symbolic annotation is required for DDA. */ |
| if (List_Representation_Info == 3 || type_annotate_only) |
| { |
| tree t = maybe_inline_call_in_expr (gnu_size); |
| return t ? annotate_value (t) : No_Uint; |
| } |
| else |
| return Uint_Minus_1; |
| |
| default: |
| return No_Uint; |
| } |
| |
| /* Now get each of the operands that's relevant for this code. If any |
| cannot be expressed as a repinfo node, say we can't. */ |
| for (int i = 0; i < TREE_CODE_LENGTH (TREE_CODE (gnu_size)); i++) |
| if (ops[i] == No_Uint) |
| { |
| ops[i] = annotate_value (TREE_OPERAND (gnu_size, i)); |
| if (ops[i] == No_Uint) |
| return No_Uint; |
| } |
| |
| Node_Ref_Or_Val ret = Create_Node (tcode, ops[0], ops[1], ops[2]); |
| |
| /* Save the result in the cache. */ |
| if (in.base.from) |
| { |
| struct tree_int_map **h; |
| /* We can't assume the hash table data hasn't moved since the initial |
| look up, so we have to search again. Allocating and inserting an |
| entry at that point would be an alternative, but then we'd better |
| discard the entry if we decided not to cache it. */ |
| h = annotate_value_cache->find_slot (&in, INSERT); |
| gcc_assert (!*h); |
| *h = ggc_alloc<tree_int_map> (); |
| (*h)->base.from = in.base.from; |
| (*h)->to = ret; |
| } |
| |
| return ret; |
| } |
| |
| /* Given GNAT_ENTITY, an object (constant, variable, parameter, exception) |
| and GNU_TYPE, its corresponding GCC type, set Esize and Alignment to the |
| size and alignment used by Gigi. Prefer SIZE over TYPE_SIZE if non-null. |
| BY_REF is true if the object is used by reference. */ |
| |
| void |
| annotate_object (Entity_Id gnat_entity, tree gnu_type, tree size, bool by_ref) |
| { |
| if (by_ref) |
| { |
| if (TYPE_IS_FAT_POINTER_P (gnu_type)) |
| gnu_type = TYPE_UNCONSTRAINED_ARRAY (gnu_type); |
| else |
| gnu_type = TREE_TYPE (gnu_type); |
| } |
| |
| if (Unknown_Esize (gnat_entity)) |
| { |
| if (TREE_CODE (gnu_type) == RECORD_TYPE |
| && TYPE_CONTAINS_TEMPLATE_P (gnu_type)) |
| size = TYPE_SIZE (TREE_TYPE (DECL_CHAIN (TYPE_FIELDS (gnu_type)))); |
| else if (!size) |
| size = TYPE_SIZE (gnu_type); |
| |
| if (size) |
| Set_Esize (gnat_entity, annotate_value (size)); |
| } |
| |
| if (Unknown_Alignment (gnat_entity)) |
| Set_Alignment (gnat_entity, |
| UI_From_Int (TYPE_ALIGN (gnu_type) / BITS_PER_UNIT)); |
| } |
| |
| /* Return first element of field list whose TREE_PURPOSE is the same as ELEM. |
| Return NULL_TREE if there is no such element in the list. */ |
| |
| static tree |
| purpose_member_field (const_tree elem, tree list) |
| { |
| while (list) |
| { |
| tree field = TREE_PURPOSE (list); |
| if (SAME_FIELD_P (field, elem)) |
| return list; |
| list = TREE_CHAIN (list); |
| } |
| return NULL_TREE; |
| } |
| |
| /* Given GNAT_ENTITY, a record type, and GNU_TYPE, its corresponding GCC type, |
| set Component_Bit_Offset and Esize of the components to the position and |
| size used by Gigi. */ |
| |
| static void |
| annotate_rep (Entity_Id gnat_entity, tree gnu_type) |
| { |
| /* For an extension, the inherited components have not been translated because |
| they are fetched from the _Parent component on the fly. */ |
| const bool is_extension |
| = Is_Tagged_Type (gnat_entity) && Is_Derived_Type (gnat_entity); |
| |
| /* We operate by first making a list of all fields and their position (we |
| can get the size easily) and then update all the sizes in the tree. */ |
| tree gnu_list |
| = build_position_list (gnu_type, false, size_zero_node, bitsize_zero_node, |
| BIGGEST_ALIGNMENT, NULL_TREE); |
| |
| for (Entity_Id gnat_field = First_Entity (gnat_entity); |
| Present (gnat_field); |
| gnat_field = Next_Entity (gnat_field)) |
| if ((Ekind (gnat_field) == E_Component |
| && (is_extension || present_gnu_tree (gnat_field))) |
| || (Ekind (gnat_field) == E_Discriminant |
| && !Is_Unchecked_Union (Scope (gnat_field)))) |
| { |
| tree t = purpose_member_field (gnat_to_gnu_field_decl (gnat_field), |
| gnu_list); |
| if (t) |
| { |
| tree offset = TREE_VEC_ELT (TREE_VALUE (t), 0); |
| tree bit_offset = TREE_VEC_ELT (TREE_VALUE (t), 2); |
| |
| /* If we are just annotating types and the type is tagged, the tag |
| and the parent components are not generated by the front-end so |
| we need to add the appropriate offset to each component without |
| representation clause. */ |
| if (type_annotate_only |
| && Is_Tagged_Type (gnat_entity) |
| && No (Component_Clause (gnat_field))) |
| { |
| tree parent_bit_offset; |
| |
| /* For a component appearing in the current extension, the |
| offset is the size of the parent. */ |
| if (Is_Derived_Type (gnat_entity) |
| && Original_Record_Component (gnat_field) == gnat_field) |
| parent_bit_offset |
| = UI_To_gnu (Esize (Etype (Base_Type (gnat_entity))), |
| bitsizetype); |
| else |
| parent_bit_offset = bitsize_int (POINTER_SIZE); |
| |
| if (TYPE_FIELDS (gnu_type)) |
| parent_bit_offset |
| = round_up (parent_bit_offset, |
| DECL_ALIGN (TYPE_FIELDS (gnu_type))); |
| |
| offset |
| = size_binop (PLUS_EXPR, offset, |
| fold_convert (sizetype, |
| size_binop (TRUNC_DIV_EXPR, |
| parent_bit_offset, |
| bitsize_unit_node))); |
| } |
| |
| /* If the field has a variable offset, also compute the normalized |
| position since it's easier to do on trees here than to deduce |
| it from the annotated expression of Component_Bit_Offset. */ |
| if (TREE_CODE (offset) != INTEGER_CST) |
| { |
| normalize_offset (&offset, &bit_offset, BITS_PER_UNIT); |
| Set_Normalized_Position (gnat_field, |
| annotate_value (offset)); |
| Set_Normalized_First_Bit (gnat_field, |
| annotate_value (bit_offset)); |
| } |
| |
| Set_Component_Bit_Offset |
| (gnat_field, |
| annotate_value (bit_from_pos (offset, bit_offset))); |
| |
| Set_Esize (gnat_field, |
| annotate_value (DECL_SIZE (TREE_PURPOSE (t)))); |
| } |
| else if (is_extension) |
| { |
| /* If there is no entry, this is an inherited component whose |
| position is the same as in the parent type. */ |
| Entity_Id gnat_orig = Original_Record_Component (gnat_field); |
| |
| /* If we are just annotating types, discriminants renaming those of |
| the parent have no entry so deal with them specifically. */ |
| if (type_annotate_only |
| && gnat_orig == gnat_field |
| && Ekind (gnat_field) == E_Discriminant) |
| gnat_orig = Corresponding_Discriminant (gnat_field); |
| |
| if (Known_Normalized_Position (gnat_orig)) |
| { |
| Set_Normalized_Position (gnat_field, |
| Normalized_Position (gnat_orig)); |
| Set_Normalized_First_Bit (gnat_field, |
| Normalized_First_Bit (gnat_orig)); |
| } |
| |
| Set_Component_Bit_Offset (gnat_field, |
| Component_Bit_Offset (gnat_orig)); |
| |
| Set_Esize (gnat_field, Esize (gnat_orig)); |
| } |
| } |
| } |
| |
| /* Scan all fields in GNU_TYPE and return a TREE_LIST where TREE_PURPOSE is |
| the FIELD_DECL and TREE_VALUE a TREE_VEC containing the byte position, the |
| value to be placed into DECL_OFFSET_ALIGN and the bit position. The list |
| of fields is flattened, except for variant parts if DO_NOT_FLATTEN_VARIANT |
| is set to true. GNU_POS is to be added to the position, GNU_BITPOS to the |
| bit position, OFFSET_ALIGN is the present offset alignment. GNU_LIST is a |
| pre-existing list to be chained to the newly created entries. */ |
| |
| static tree |
| build_position_list (tree gnu_type, bool do_not_flatten_variant, tree gnu_pos, |
| tree gnu_bitpos, unsigned int offset_align, tree gnu_list) |
| { |
| tree gnu_field; |
| |
| for (gnu_field = TYPE_FIELDS (gnu_type); |
| gnu_field; |
| gnu_field = DECL_CHAIN (gnu_field)) |
| { |
| tree gnu_our_bitpos = size_binop (PLUS_EXPR, gnu_bitpos, |
| DECL_FIELD_BIT_OFFSET (gnu_field)); |
| tree gnu_our_offset = size_binop (PLUS_EXPR, gnu_pos, |
| DECL_FIELD_OFFSET (gnu_field)); |
| unsigned int our_offset_align |
| = MIN (offset_align, DECL_OFFSET_ALIGN (gnu_field)); |
| tree v = make_tree_vec (3); |
| |
| TREE_VEC_ELT (v, 0) = gnu_our_offset; |
| TREE_VEC_ELT (v, 1) = size_int (our_offset_align); |
| TREE_VEC_ELT (v, 2) = gnu_our_bitpos; |
| gnu_list = tree_cons (gnu_field, v, gnu_list); |
| |
| /* Recurse on internal fields, flattening the nested fields except for |
| those in the variant part, if requested. */ |
| if (DECL_INTERNAL_P (gnu_field)) |
| { |
| tree gnu_field_type = TREE_TYPE (gnu_field); |
| if (do_not_flatten_variant |
| && TREE_CODE (gnu_field_type) == QUAL_UNION_TYPE) |
| gnu_list |
| = build_position_list (gnu_field_type, do_not_flatten_variant, |
| size_zero_node, bitsize_zero_node, |
| BIGGEST_ALIGNMENT, gnu_list); |
| else |
| gnu_list |
| = build_position_list (gnu_field_type, do_not_flatten_variant, |
| gnu_our_offset, gnu_our_bitpos, |
| our_offset_align, gnu_list); |
| } |
| } |
| |
| return gnu_list; |
| } |
| |
| /* Return a list describing the substitutions needed to reflect the |
| discriminant substitutions from GNAT_TYPE to GNAT_SUBTYPE. They can |
| be in any order. The values in an element of the list are in the form |
| of operands to SUBSTITUTE_IN_EXPR. DEFINITION is true if this is for |
| a definition of GNAT_SUBTYPE. */ |
| |
| static vec<subst_pair> |
| build_subst_list (Entity_Id gnat_subtype, Entity_Id gnat_type, bool definition) |
| { |
| vec<subst_pair> gnu_list = vNULL; |
| Entity_Id gnat_discrim; |
| Node_Id gnat_constr; |
| |
| for (gnat_discrim = First_Stored_Discriminant (gnat_type), |
| gnat_constr = First_Elmt (Stored_Constraint (gnat_subtype)); |
| Present (gnat_discrim); |
| gnat_discrim = Next_Stored_Discriminant (gnat_discrim), |
| gnat_constr = Next_Elmt (gnat_constr)) |
| /* Ignore access discriminants. */ |
| if (!Is_Access_Type (Etype (Node (gnat_constr)))) |
| { |
| tree gnu_field = gnat_to_gnu_field_decl (gnat_discrim); |
| tree replacement = convert (TREE_TYPE (gnu_field), |
| elaborate_expression |
| (Node (gnat_constr), gnat_subtype, |
| get_entity_char (gnat_discrim), |
| definition, true, false)); |
| subst_pair s = { gnu_field, replacement }; |
| gnu_list.safe_push (s); |
| } |
| |
| return gnu_list; |
| } |
| |
| /* Scan all fields in QUAL_UNION_TYPE and return a list describing the |
| variants of QUAL_UNION_TYPE that are still relevant after applying |
| the substitutions described in SUBST_LIST. GNU_LIST is a pre-existing |
| list to be prepended to the newly created entries. */ |
| |
| static vec<variant_desc> |
| build_variant_list (tree qual_union_type, vec<subst_pair> subst_list, |
| vec<variant_desc> gnu_list) |
| { |
| tree gnu_field; |
| |
| for (gnu_field = TYPE_FIELDS (qual_union_type); |
| gnu_field; |
| gnu_field = DECL_CHAIN (gnu_field)) |
| { |
| tree qual = DECL_QUALIFIER (gnu_field); |
| unsigned int i; |
| subst_pair *s; |
| |
| FOR_EACH_VEC_ELT (subst_list, i, s) |
| qual = SUBSTITUTE_IN_EXPR (qual, s->discriminant, s->replacement); |
| |
| /* If the new qualifier is not unconditionally false, its variant may |
| still be accessed. */ |
| if (!integer_zerop (qual)) |
| { |
| tree variant_type = TREE_TYPE (gnu_field), variant_subpart; |
| variant_desc v |
| = { variant_type, gnu_field, qual, NULL_TREE, NULL_TREE }; |
| |
| gnu_list.safe_push (v); |
| |
| /* Recurse on the variant subpart of the variant, if any. */ |
| variant_subpart = get_variant_part (variant_type); |
| if (variant_subpart) |
| gnu_list = build_variant_list (TREE_TYPE (variant_subpart), |
| subst_list, gnu_list); |
| |
| /* If the new qualifier is unconditionally true, the subsequent |
| variants cannot be accessed. */ |
| if (integer_onep (qual)) |
| break; |
| } |
| } |
| |
| return gnu_list; |
| } |
| |
| /* UINT_SIZE is a Uint giving the specified size for an object of GNU_TYPE |
| corresponding to GNAT_OBJECT. If the size is valid, return an INTEGER_CST |
| corresponding to its value. Otherwise, return NULL_TREE. KIND is set to |
| VAR_DECL if we are specifying the size of an object, TYPE_DECL for the |
| size of a type, and FIELD_DECL for the size of a field. COMPONENT_P is |
| true if we are being called to process the Component_Size of GNAT_OBJECT; |
| this is used only for error messages. ZERO_OK is true if a size of zero |
| is permitted; if ZERO_OK is false, it means that a size of zero should be |
| treated as an unspecified size. */ |
| |
| static tree |
| validate_size (Uint uint_size, tree gnu_type, Entity_Id gnat_object, |
| enum tree_code kind, bool component_p, bool zero_ok) |
| { |
| Node_Id gnat_error_node; |
| tree type_size, size; |
| |
| /* Return 0 if no size was specified. */ |
| if (uint_size == No_Uint) |
| return NULL_TREE; |
| |
| /* Ignore a negative size since that corresponds to our back-annotation. */ |
| if (UI_Lt (uint_size, Uint_0)) |
| return NULL_TREE; |
| |
| /* Find the node to use for error messages. */ |
| if ((Ekind (gnat_object) == E_Component |
| || Ekind (gnat_object) == E_Discriminant) |
| && Present (Component_Clause (gnat_object))) |
| gnat_error_node = Last_Bit (Component_Clause (gnat_object)); |
| else if (Present (Size_Clause (gnat_object))) |
| gnat_error_node = Expression (Size_Clause (gnat_object)); |
| else |
| gnat_error_node = gnat_object; |
| |
| /* Get the size as an INTEGER_CST. Issue an error if a size was specified |
| but cannot be represented in bitsizetype. */ |
| size = UI_To_gnu (uint_size, bitsizetype); |
| if (TREE_OVERFLOW (size)) |
| { |
| if (component_p) |
| post_error_ne ("component size for& is too large", gnat_error_node, |
| gnat_object); |
| else |
| post_error_ne ("size for& is too large", gnat_error_node, |
| gnat_object); |
| return NULL_TREE; |
| } |
| |
| /* Ignore a zero size if it is not permitted. */ |
| if (!zero_ok && integer_zerop (size)) |
| return NULL_TREE; |
| |
| /* The size of objects is always a multiple of a byte. */ |
| if (kind == VAR_DECL |
| && !integer_zerop (size_binop (TRUNC_MOD_EXPR, size, bitsize_unit_node))) |
| { |
| if (component_p) |
| post_error_ne ("component size for& is not a multiple of Storage_Unit", |
| gnat_error_node, gnat_object); |
| else |
| post_error_ne ("size for& is not a multiple of Storage_Unit", |
| gnat_error_node, gnat_object); |
| return NULL_TREE; |
| } |
| |
| /* If this is an integral type or a packed array type, the front-end has |
| already verified the size, so we need not do it here (which would mean |
| checking against the bounds). However, if this is an aliased object, |
| it may not be smaller than the type of the object. */ |
| if ((INTEGRAL_TYPE_P (gnu_type) || TYPE_IS_PACKED_ARRAY_TYPE_P (gnu_type)) |
| && !(kind == VAR_DECL && Is_Aliased (gnat_object))) |
| return size; |
| |
| /* If the object is a record that contains a template, add the size of the |
| template to the specified size. */ |
| if (TREE_CODE (gnu_type) == RECORD_TYPE |
| && TYPE_CONTAINS_TEMPLATE_P (gnu_type)) |
| size = size_binop (PLUS_EXPR, DECL_SIZE (TYPE_FIELDS (gnu_type)), size); |
| |
| if (kind == VAR_DECL |
| /* If a type needs strict alignment, a component of this type in |
| a packed record cannot be packed and thus uses the type size. */ |
| || (kind == TYPE_DECL && Strict_Alignment (gnat_object))) |
| type_size = TYPE_SIZE (gnu_type); |
| else |
| type_size = rm_size (gnu_type); |
| |
| /* Modify the size of a discriminated type to be the maximum size. */ |
| if (type_size && CONTAINS_PLACEHOLDER_P (type_size)) |
| type_size = max_size (type_size, true); |
| |
| /* If this is an access type or a fat pointer, the minimum size is that given |
| by the smallest integral mode that's valid for pointers. */ |
| if (TREE_CODE (gnu_type) == POINTER_TYPE || TYPE_IS_FAT_POINTER_P (gnu_type)) |
| { |
| scalar_int_mode p_mode = NARROWEST_INT_MODE; |
| while (!targetm.valid_pointer_mode (p_mode)) |
| p_mode = GET_MODE_WIDER_MODE (p_mode).require (); |
| type_size = bitsize_int (GET_MODE_BITSIZE (p_mode)); |
| } |
| |
| /* Issue an error either if the default size of the object isn't a constant |
| or if the new size is smaller than it. */ |
| if (TREE_CODE (type_size) != INTEGER_CST |
| || TREE_OVERFLOW (type_size) |
| || tree_int_cst_lt (size, type_size)) |
| { |
| if (component_p) |
| post_error_ne_tree |
| ("component size for& too small{, minimum allowed is ^}", |
| gnat_error_node, gnat_object, type_size); |
| else |
| post_error_ne_tree |
| ("size for& too small{, minimum allowed is ^}", |
| gnat_error_node, gnat_object, type_size); |
| return NULL_TREE; |
| } |
| |
| return size; |
| } |
| |
| /* Similarly, but both validate and process a value of RM size. This routine |
| is only called for types. */ |
| |
| static void |
| set_rm_size (Uint uint_size, tree gnu_type, Entity_Id gnat_entity) |
| { |
| Node_Id gnat_attr_node; |
| tree old_size, size; |
| |
| /* Do nothing if no size was specified. */ |
| if (uint_size == No_Uint) |
| return; |
| |
| /* Only issue an error if a Value_Size clause was explicitly given. |
| Otherwise, we'd be duplicating an error on the Size clause. */ |
| gnat_attr_node |
| = Get_Attribute_Definition_Clause (gnat_entity, Attr_Value_Size); |
| |
| /* Get the size as an INTEGER_CST. Issue an error if a size was specified |
| but cannot be represented in bitsizetype. */ |
| size = UI_To_gnu (uint_size, bitsizetype); |
| if (TREE_OVERFLOW (size)) |
| { |
| if (Present (gnat_attr_node)) |
| post_error_ne ("Value_Size for& is too large", gnat_attr_node, |
| gnat_entity); |
| return; |
| } |
| |
| /* Ignore a zero size unless a Value_Size clause exists, or a size clause |
| exists, or this is an integer type, in which case the front-end will |
| have always set it. */ |
| if (No (gnat_attr_node) |
| && integer_zerop (size) |
| && !Has_Size_Clause (gnat_entity) |
| && !Is_Discrete_Or_Fixed_Point_Type (gnat_entity)) |
| return; |
| |
| old_size = rm_size (gnu_type); |
| |
| /* If the old size is self-referential, get the maximum size. */ |
| if (CONTAINS_PLACEHOLDER_P (old_size)) |
| old_size = max_size (old_size, true); |
| |
| /* Issue an error either if the old size of the object isn't a constant or |
| if the new size is smaller than it. The front-end has already verified |
| this for scalar and packed array types. */ |
| if (TREE_CODE (old_size) != INTEGER_CST |
| || TREE_OVERFLOW (old_size) |
| || (AGGREGATE_TYPE_P (gnu_type) |
| && !(TREE_CODE (gnu_type) == ARRAY_TYPE |
| && TYPE_PACKED_ARRAY_TYPE_P (gnu_type)) |
| && !(TYPE_IS_PADDING_P (gnu_type) |
| && TREE_CODE (TREE_TYPE (TYPE_FIELDS (gnu_type))) == ARRAY_TYPE |
| && TYPE_PACKED_ARRAY_TYPE_P |
| (TREE_TYPE (TYPE_FIELDS (gnu_type)))) |
| && tree_int_cst_lt (size, old_size))) |
| { |
| if (Present (gnat_attr_node)) |
| post_error_ne_tree |
| ("Value_Size for& too small{, minimum allowed is ^}", |
| gnat_attr_node, gnat_entity, old_size); |
| return; |
| } |
| |
| /* Otherwise, set the RM size proper for integral types... */ |
| if ((TREE_CODE (gnu_type) == INTEGER_TYPE |
| && Is_Discrete_Or_Fixed_Point_Type (gnat_entity)) |
| || (TREE_CODE (gnu_type) == ENUMERAL_TYPE |
| || TREE_CODE (gnu_type) == BOOLEAN_TYPE)) |
| SET_TYPE_RM_SIZE (gnu_type, size); |
| |
| /* ...or the Ada size for record and union types. */ |
| else if (RECORD_OR_UNION_TYPE_P (gnu_type) |
| && !TYPE_FAT_POINTER_P (gnu_type)) |
| SET_TYPE_ADA_SIZE (gnu_type, size); |
| } |
| |
| /* ALIGNMENT is a Uint giving the alignment specified for GNAT_ENTITY, |
| a type or object whose present alignment is ALIGN. If this alignment is |
| valid, return it. Otherwise, give an error and return ALIGN. */ |
| |
| static unsigned int |
| validate_alignment (Uint alignment, Entity_Id gnat_entity, unsigned int align) |
| { |
| unsigned int max_allowed_alignment = get_target_maximum_allowed_alignment (); |
| unsigned int new_align; |
| Node_Id gnat_error_node; |
| |
| /* Don't worry about checking alignment if alignment was not specified |
| by the source program and we already posted an error for this entity. */ |
| if (Error_Posted (gnat_entity) && !Has_Alignment_Clause (gnat_entity)) |
| return align; |
| |
| /* Post the error on the alignment clause if any. Note, for the implicit |
| base type of an array type, the alignment clause is on the first |
| subtype. */ |
| if (Present (Alignment_Clause (gnat_entity))) |
| gnat_error_node = Expression (Alignment_Clause (gnat_entity)); |
| |
| else if (Is_Itype (gnat_entity) |
| && Is_Array_Type (gnat_entity) |
| && Etype (gnat_entity) == gnat_entity |
| && Present (Alignment_Clause (First_Subtype (gnat_entity)))) |
| gnat_error_node = |
| Expression (Alignment_Clause (First_Subtype (gnat_entity))); |
| |
| else |
| gnat_error_node = gnat_entity; |
| |
| /* Within GCC, an alignment is an integer, so we must make sure a value is |
| specified that fits in that range. Also, there is an upper bound to |
| alignments we can support/allow. */ |
| if (!UI_Is_In_Int_Range (alignment) |
| || ((new_align = UI_To_Int (alignment)) > max_allowed_alignment)) |
| post_error_ne_num ("largest supported alignment for& is ^", |
| gnat_error_node, gnat_entity, max_allowed_alignment); |
| else if (!(Present (Alignment_Clause (gnat_entity)) |
| && From_At_Mod (Alignment_Clause (gnat_entity))) |
| && new_align * BITS_PER_UNIT < align) |
| { |
| unsigned int double_align; |
| bool is_capped_double, align_clause; |
| |
| /* If the default alignment of "double" or larger scalar types is |
| specifically capped and the new alignment is above the cap, do |
| not post an error and change the alignment only if there is an |
| alignment clause; this makes it possible to have the associated |
| GCC type overaligned by default for performance reasons. */ |
| if ((double_align = double_float_alignment) > 0) |
| { |
| Entity_Id gnat_type |
| = Is_Type (gnat_entity) ? gnat_entity : Etype (gnat_entity); |
| is_capped_double |
| = is_double_float_or_array (gnat_type, &align_clause); |
| } |
| else if ((double_align = double_scalar_alignment) > 0) |
| { |
| Entity_Id gnat_type |
| = Is_Type (gnat_entity) ? gnat_entity : Etype (gnat_entity); |
| is_capped_double |
| = is_double_scalar_or_array (gnat_type, &align_clause); |
| } |
| else |
| is_capped_double = align_clause = false; |
| |
| if (is_capped_double && new_align >= double_align) |
| { |
| if (align_clause) |
| align = new_align * BITS_PER_UNIT; |
| } |
| else |
| { |
| if (is_capped_double) |
| align = double_align * BITS_PER_UNIT; |
| |
| post_error_ne_num ("alignment for& must be at least ^", |
| gnat_error_node, gnat_entity, |
| align / BITS_PER_UNIT); |
| } |
| } |
| else |
| { |
| new_align = (new_align > 0 ? new_align * BITS_PER_UNIT : 1); |
| if (new_align > align) |
| align = new_align; |
| } |
| |
| return align; |
| } |
| |
| /* Promote the alignment of GNU_TYPE corresponding to GNAT_ENTITY. Return |
| a positive value on success or zero on failure. */ |
| |
| static unsigned int |
| promote_object_alignment (tree gnu_type, Entity_Id gnat_entity) |
| { |
| unsigned int align, size_cap, align_cap; |
| |
| /* No point in promoting the alignment if this doesn't prevent BLKmode access |
| to the object, in particular block copy, as this will for example disable |
| the NRV optimization for it. No point in jumping through all the hoops |
| needed in order to support BIGGEST_ALIGNMENT if we don't really have to. |
| So we cap to the smallest alignment that corresponds to a known efficient |
| memory access pattern, except for Atomic and Volatile_Full_Access. */ |
| if (Is_Atomic_Or_VFA (gnat_entity)) |
| { |
| size_cap = UINT_MAX; |
| align_cap = BIGGEST_ALIGNMENT; |
| } |
| else |
| { |
| size_cap = MAX_FIXED_MODE_SIZE; |
| align_cap = get_mode_alignment (ptr_mode); |
| } |
| |
| /* Do the promotion within the above limits. */ |
| if (!tree_fits_uhwi_p (TYPE_SIZE (gnu_type)) |
| || compare_tree_int (TYPE_SIZE (gnu_type), size_cap) > 0) |
| align = 0; |
| else if (compare_tree_int (TYPE_SIZE (gnu_type), align_cap) > 0) |
| align = align_cap; |
| else |
| align = ceil_pow2 (tree_to_uhwi (TYPE_SIZE (gnu_type))); |
| |
| /* But make sure not to under-align the object. */ |
| if (align <= TYPE_ALIGN (gnu_type)) |
| align = 0; |
| |
| /* And honor the minimum valid atomic alignment, if any. */ |
| #ifdef MINIMUM_ATOMIC_ALIGNMENT |
| else if (align < MINIMUM_ATOMIC_ALIGNMENT) |
| align = MINIMUM_ATOMIC_ALIGNMENT; |
| #endif |
| |
| return align; |
| } |
| |
| /* Verify that TYPE is something we can implement atomically. If not, issue |
| an error for GNAT_ENTITY. COMPONENT_P is true if we are being called to |
| process a component type. */ |
| |
| static void |
| check_ok_for_atomic_type (tree type, Entity_Id gnat_entity, bool component_p) |
| { |
| Node_Id gnat_error_point = gnat_entity; |
| Node_Id gnat_node; |
| machine_mode mode; |
| enum mode_class mclass; |
| unsigned int align; |
| tree size; |
| |
| /* If this is an anonymous base type, nothing to check, the error will be |
| reported on the source type if need be. */ |
| if (!Comes_From_Source (gnat_entity)) |
| return; |
| |
| mode = TYPE_MODE (type); |
| mclass = GET_MODE_CLASS (mode); |
| align = TYPE_ALIGN (type); |
| size = TYPE_SIZE (type); |
| |
| /* Consider all aligned floating-point types atomic and any aligned types |
| that are represented by integers no wider than a machine word. */ |
| scalar_int_mode int_mode; |
| if ((mclass == MODE_FLOAT |
| || (is_a <scalar_int_mode> (mode, &int_mode) |
| && GET_MODE_BITSIZE (int_mode) <= BITS_PER_WORD)) |
| && align >= GET_MODE_ALIGNMENT (mode)) |
| return; |
| |
| /* For the moment, also allow anything that has an alignment equal to its |
| size and which is smaller than a word. */ |
| if (size |
| && TREE_CODE (size) == INTEGER_CST |
| && compare_tree_int (size, align) == 0 |
| && align <= BITS_PER_WORD) |
| return; |
| |
| for (gnat_node = First_Rep_Item (gnat_entity); |
| Present (gnat_node); |
| gnat_node = Next_Rep_Item (gnat_node)) |
| if (Nkind (gnat_node) == N_Pragma) |
| { |
| unsigned char pragma_id |
| = Get_Pragma_Id (Chars (Pragma_Identifier (gnat_node))); |
| |
| if ((pragma_id == Pragma_Atomic && !component_p) |
| || (pragma_id == Pragma_Atomic_Components && component_p)) |
| { |
| gnat_error_point = First (Pragma_Argument_Associations (gnat_node)); |
| break; |
| } |
| } |
| |
| if (component_p) |
| post_error_ne ("atomic access to component of & cannot be guaranteed", |
| gnat_error_point, gnat_entity); |
| else if (Is_Volatile_Full_Access (gnat_entity)) |
| post_error_ne ("volatile full access to & cannot be guaranteed", |
| gnat_error_point, gnat_entity); |
| else |
| post_error_ne ("atomic access to & cannot be guaranteed", |
| gnat_error_point, gnat_entity); |
| } |
| |
| |
| /* Helper for the intrin compatibility checks family. Evaluate whether |
| two types are definitely incompatible. */ |
| |
| static bool |
| intrin_types_incompatible_p (tree t1, tree t2) |
| { |
| enum tree_code code; |
| |
| if (TYPE_MAIN_VARIANT (t1) == TYPE_MAIN_VARIANT (t2)) |
| return false; |
| |
| if (TYPE_MODE (t1) != TYPE_MODE (t2)) |
| return true; |
| |
| if (TREE_CODE (t1) != TREE_CODE (t2)) |
| return true; |
| |
| code = TREE_CODE (t1); |
| |
| switch (code) |
| { |
| case INTEGER_TYPE: |
| case REAL_TYPE: |
| return TYPE_PRECISION (t1) != TYPE_PRECISION (t2); |
| |
| case POINTER_TYPE: |
| case REFERENCE_TYPE: |
| /* Assume designated types are ok. We'd need to account for char * and |
| void * variants to do better, which could rapidly get messy and isn't |
| clearly worth the effort. */ |
| return false; |
| |
| default: |
| break; |
| } |
| |
| return false; |
| } |
| |
| /* Helper for intrin_profiles_compatible_p, to perform compatibility checks |
| on the Ada/builtin argument lists for the INB binding. */ |
| |
| static bool |
| intrin_arglists_compatible_p (intrin_binding_t * inb) |
| { |
| function_args_iterator ada_iter, btin_iter; |
| |
| function_args_iter_init (&ada_iter, inb->ada_fntype); |
| function_args_iter_init (&btin_iter, inb->btin_fntype); |
| |
| /* Sequence position of the last argument we checked. */ |
| int argpos = 0; |
| |
| while (true) |
| { |
| tree ada_type = function_args_iter_cond (&ada_iter); |
| tree btin_type = function_args_iter_cond (&btin_iter); |
| |
| /* If we've exhausted both lists simultaneously, we're done. */ |
| if (!ada_type && !btin_type) |
| break; |
| |
| /* If one list is shorter than the other, they fail to match. */ |
| if (!ada_type || !btin_type) |
| return false; |
| |
| /* If we're done with the Ada args and not with the internal builtin |
| args, or the other way around, complain. */ |
| if (ada_type == void_type_node |
| && btin_type != void_type_node) |
| { |
| post_error ("?Ada arguments list too short!", inb->gnat_entity); |
| return false; |
| } |
| |
| if (btin_type == void_type_node |
| && ada_type != void_type_node) |
| { |
| post_error_ne_num ("?Ada arguments list too long ('> ^)!", |
| inb->gnat_entity, inb->gnat_entity, argpos); |
| return false; |
| } |
| |
| /* Otherwise, check that types match for the current argument. */ |
| argpos ++; |
| if (intrin_types_incompatible_p (ada_type, btin_type)) |
| { |
| post_error_ne_num ("?intrinsic binding type mismatch on argument ^!", |
| inb->gnat_entity, inb->gnat_entity, argpos); |
| return false; |
| } |
| |
| |
| function_args_iter_next (&ada_iter); |
| function_args_iter_next (&btin_iter); |
| } |
| |
| return true; |
| } |
| |
| /* Helper for intrin_profiles_compatible_p, to perform compatibility checks |
| on the Ada/builtin return values for the INB binding. */ |
| |
| static bool |
| intrin_return_compatible_p (intrin_binding_t * inb) |
| { |
| tree ada_return_type = TREE_TYPE (inb->ada_fntype); |
| tree btin_return_type = TREE_TYPE (inb->btin_fntype); |
| |
| /* Accept function imported as procedure, common and convenient. */ |
| if (VOID_TYPE_P (ada_return_type) |
| && !VOID_TYPE_P (btin_return_type)) |
| return true; |
| |
| /* Check return types compatibility otherwise. Note that this |
| handles void/void as well. */ |
| if (intrin_types_incompatible_p (btin_return_type, ada_return_type)) |
| { |
| post_error ("?intrinsic binding type mismatch on return value!", |
| inb->gnat_entity); |
| return false; |
| } |
| |
| return true; |
| } |
| |
| /* Check and return whether the Ada and gcc builtin profiles bound by INB are |
| compatible. Issue relevant warnings when they are not. |
| |
| This is intended as a light check to diagnose the most obvious cases, not |
| as a full fledged type compatibility predicate. It is the programmer's |
| responsibility to ensure correctness of the Ada declarations in Imports, |
| especially when binding straight to a compiler internal. */ |
| |
| static bool |
| intrin_profiles_compatible_p (intrin_binding_t * inb) |
| { |
| /* Check compatibility on return values and argument lists, each responsible |
| for posting warnings as appropriate. Ensure use of the proper sloc for |
| this purpose. */ |
| |
| bool arglists_compatible_p, return_compatible_p; |
| location_t saved_location = input_location; |
| |
| Sloc_to_locus (Sloc (inb->gnat_entity), &input_location); |
| |
| return_compatible_p = intrin_return_compatible_p (inb); |
| arglists_compatible_p = intrin_arglists_compatible_p (inb); |
| |
| input_location = saved_location; |
| |
| return return_compatible_p && arglists_compatible_p; |
| } |
| |
| /* Return a FIELD_DECL node modeled on OLD_FIELD. FIELD_TYPE is its type |
| and RECORD_TYPE is the type of the parent. If SIZE is nonzero, it is the |
| specified size for this field. POS_LIST is a position list describing |
| the layout of OLD_FIELD and SUBST_LIST a substitution list to be applied |
| to this layout. */ |
| |
| static tree |
| create_field_decl_from (tree old_field, tree field_type, tree record_type, |
| tree size, tree pos_list, |
| vec<subst_pair> subst_list) |
| { |
| tree t = TREE_VALUE (purpose_member (old_field, pos_list)); |
| tree pos = TREE_VEC_ELT (t, 0), bitpos = TREE_VEC_ELT (t, 2); |
| unsigned int offset_align = tree_to_uhwi (TREE_VEC_ELT (t, 1)); |
| tree new_pos, new_field; |
| unsigned int i; |
| subst_pair *s; |
| |
| if (CONTAINS_PLACEHOLDER_P (pos)) |
| FOR_EACH_VEC_ELT (subst_list, i, s) |
| pos = SUBSTITUTE_IN_EXPR (pos, s->discriminant, s->replacement); |
| |
| /* If the position is now a constant, we can set it as the position of the |
| field when we make it. Otherwise, we need to deal with it specially. */ |
| if (TREE_CONSTANT (pos)) |
| new_pos = bit_from_pos (pos, bitpos); |
| else |
| new_pos = NULL_TREE; |
| |
| new_field |
| = create_field_decl (DECL_NAME (old_field), field_type, record_type, |
| size, new_pos, DECL_PACKED (old_field), |
| !DECL_NONADDRESSABLE_P (old_field)); |
| |
| if (!new_pos) |
| { |
| normalize_offset (&pos, &bitpos, offset_align); |
| /* Finalize the position. */ |
| DECL_FIELD_OFFSET (new_field) = variable_size (pos); |
| DECL_FIELD_BIT_OFFSET (new_field) = bitpos; |
| SET_DECL_OFFSET_ALIGN (new_field, offset_align); |
| DECL_SIZE (new_field) = size; |
| DECL_SIZE_UNIT (new_field) |
| = convert (sizetype, |
| size_binop (CEIL_DIV_EXPR, size, bitsize_unit_node)); |
| layout_decl (new_field, DECL_OFFSET_ALIGN (new_field)); |
| } |
| |
| DECL_INTERNAL_P (new_field) = DECL_INTERNAL_P (old_field); |
| SET_DECL_ORIGINAL_FIELD_TO_FIELD (new_field, old_field); |
| DECL_DISCRIMINANT_NUMBER (new_field) = DECL_DISCRIMINANT_NUMBER (old_field); |
| TREE_THIS_VOLATILE (new_field) = TREE_THIS_VOLATILE (old_field); |
| |
| return new_field; |
| } |
| |
| /* Create the REP part of RECORD_TYPE with REP_TYPE. If MIN_SIZE is nonzero, |
| it is the minimal size the REP_PART must have. */ |
| |
| static tree |
| create_rep_part (tree rep_type, tree record_type, tree min_size) |
| { |
| tree field; |
| |
| if (min_size && !tree_int_cst_lt (TYPE_SIZE (rep_type), min_size)) |
| min_size = NULL_TREE; |
| |
| field = create_field_decl (get_identifier ("REP"), rep_type, record_type, |
| min_size, NULL_TREE, 0, 1); |
| DECL_INTERNAL_P (field) = 1; |
| |
| return field; |
| } |
| |
| /* Return the REP part of RECORD_TYPE, if any. Otherwise return NULL. */ |
| |
| static tree |
| get_rep_part (tree record_type) |
| { |
| tree field = TYPE_FIELDS (record_type); |
| |
| /* The REP part is the first field, internal, another record, and its name |
| starts with an 'R'. */ |
| if (field |
| && DECL_INTERNAL_P (field) |
| && TREE_CODE (TREE_TYPE (field)) == RECORD_TYPE |
| && IDENTIFIER_POINTER (DECL_NAME (field)) [0] == 'R') |
| return field; |
| |
| return NULL_TREE; |
| } |
| |
| /* Return the variant part of RECORD_TYPE, if any. Otherwise return NULL. */ |
| |
| tree |
| get_variant_part (tree record_type) |
| { |
| tree field; |
| |
| /* The variant part is the only internal field that is a qualified union. */ |
| for (field = TYPE_FIELDS (record_type); field; field = DECL_CHAIN (field)) |
| if (DECL_INTERNAL_P (field) |
| && TREE_CODE (TREE_TYPE (field)) == QUAL_UNION_TYPE) |
| return field; |
| |
| return NULL_TREE; |
| } |
| |
| /* Return a new variant part modeled on OLD_VARIANT_PART. VARIANT_LIST is |
| the list of variants to be used and RECORD_TYPE is the type of the parent. |
| POS_LIST is a position list describing the layout of fields present in |
| OLD_VARIANT_PART and SUBST_LIST a substitution list to be applied to this |
| layout. DEBUG_INFO_P is true if we need to write debug information. */ |
| |
| static tree |
| create_variant_part_from (tree old_variant_part, |
| vec<variant_desc> variant_list, |
| tree record_type, tree pos_list, |
| vec<subst_pair> subst_list, |
| bool debug_info_p) |
| { |
| tree offset = DECL_FIELD_OFFSET (old_variant_part); |
| tree old_union_type = TREE_TYPE (old_variant_part); |
| tree new_union_type, new_variant_part; |
| tree union_field_list = NULL_TREE; |
| variant_desc *v; |
| unsigned int i; |
| |
| /* First create the type of the variant part from that of the old one. */ |
| new_union_type = make_node (QUAL_UNION_TYPE); |
| TYPE_NAME (new_union_type) |
| = concat_name (TYPE_NAME (record_type), |
| IDENTIFIER_POINTER (DECL_NAME (old_variant_part))); |
| |
| /* If the position of the variant part is constant, subtract it from the |
| size of the type of the parent to get the new size. This manual CSE |
| reduces the code size when not optimizing. */ |
| if (TREE_CODE (offset) == INTEGER_CST |
| && TYPE_SIZE (record_type) |
| && TYPE_SIZE_UNIT (record_type)) |
| { |
| tree bitpos = DECL_FIELD_BIT_OFFSET (old_variant_part); |
| tree first_bit = bit_from_pos (offset, bitpos); |
| TYPE_SIZE (new_union_type) |
| = size_binop (MINUS_EXPR, TYPE_SIZE (record_type), first_bit); |
| TYPE_SIZE_UNIT (new_union_type) |
| = size_binop (MINUS_EXPR, TYPE_SIZE_UNIT (record_type), |
| byte_from_pos (offset, bitpos)); |
| SET_TYPE_ADA_SIZE (new_union_type, |
| size_binop (MINUS_EXPR, TYPE_ADA_SIZE (record_type), |
| first_bit)); |
| SET_TYPE_ALIGN (new_union_type, TYPE_ALIGN (old_union_type)); |
| relate_alias_sets (new_union_type, old_union_type, ALIAS_SET_COPY); |
| } |
| else |
| copy_and_substitute_in_size (new_union_type, old_union_type, subst_list); |
| |
| /* Now finish up the new variants and populate the union type. */ |
| FOR_EACH_VEC_ELT_REVERSE (variant_list, i, v) |
| { |
| tree old_field = v->field, new_field; |
| tree old_variant, old_variant_subpart, new_variant, field_list; |
| |
| /* Skip variants that don't belong to this nesting level. */ |
| if (DECL_CONTEXT (old_field) != old_union_type) |
| continue; |
| |
| /* Retrieve the list of fields already added to the new variant. */ |
| new_variant = v->new_type; |
| field_list = TYPE_FIELDS (new_variant); |
| |
| /* If the old variant had a variant subpart, we need to create a new |
| variant subpart and add it to the field list. */ |
| old_variant = v->type; |
| old_variant_subpart = get_variant_part (old_variant); |
| if (old_variant_subpart) |
| { |
| tree new_variant_subpart |
| = create_variant_part_from (old_variant_subpart, variant_list, |
| new_variant, pos_list, subst_list, |
| debug_info_p); |
| DECL_CHAIN (new_variant_subpart) = field_list; |
| field_list = new_variant_subpart; |
| } |
| |
| /* Finish up the new variant and create the field. */ |
| finish_record_type (new_variant, nreverse (field_list), 2, debug_info_p); |
| create_type_decl (TYPE_NAME (new_variant), new_variant, true, |
| debug_info_p, Empty); |
| |
| new_field |
| = create_field_decl_from (old_field, new_variant, new_union_type, |
| TYPE_SIZE (new_variant), |
| pos_list, subst_list); |
| DECL_QUALIFIER (new_field) = v->qual; |
| DECL_INTERNAL_P (new_field) = 1; |
| DECL_CHAIN (new_field) = union_field_list; |
| union_field_list = new_field; |
| } |
| |
| /* Finish up the union type and create the variant part. Note that we don't |
| reverse the field list because VARIANT_LIST has been traversed in reverse |
| order. */ |
| finish_record_type (new_union_type, union_field_list, 2, debug_info_p); |
| create_type_decl (TYPE_NAME (new_union_type), new_union_type, true, |
| debug_info_p, Empty); |
| |
| new_variant_part |
| = create_field_decl_from (old_variant_part, new_union_type, record_type, |
| TYPE_SIZE (new_union_type), |
| pos_list, subst_list); |
| DECL_INTERNAL_P (new_variant_part) = 1; |
| |
| /* With multiple discriminants it is possible for an inner variant to be |
| statically selected while outer ones are not; in this case, the list |
| of fields of the inner variant is not flattened and we end up with a |
| qualified union with a single member. Drop the useless container. */ |
| if (!DECL_CHAIN (union_field_list)) |
| { |
| DECL_CONTEXT (union_field_list) = record_type; |
| DECL_FIELD_OFFSET (union_field_list) |
| = DECL_FIELD_OFFSET (new_variant_part); |
| DECL_FIELD_BIT_OFFSET (union_field_list) |
| = DECL_FIELD_BIT_OFFSET (new_variant_part); |
| SET_DECL_OFFSET_ALIGN (union_field_list, |
| DECL_OFFSET_ALIGN (new_variant_part)); |
| new_variant_part = union_field_list; |
| } |
| |
| return new_variant_part; |
| } |
| |
| /* Copy the size (and alignment and alias set) from OLD_TYPE to NEW_TYPE, |
| which are both RECORD_TYPE, after applying the substitutions described |
| in SUBST_LIST. */ |
| |
| static void |
| copy_and_substitute_in_size (tree new_type, tree old_type, |
| vec<subst_pair> subst_list) |
| { |
| unsigned int i; |
| subst_pair *s; |
| |
| TYPE_SIZE (new_type) = TYPE_SIZE (old_type); |
| TYPE_SIZE_UNIT (new_type) = TYPE_SIZE_UNIT (old_type); |
| SET_TYPE_ADA_SIZE (new_type, TYPE_ADA_SIZE (old_type)); |
| SET_TYPE_ALIGN (new_type, TYPE_ALIGN (old_type)); |
| relate_alias_sets (new_type, old_type, ALIAS_SET_COPY); |
| |
| if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE (new_type))) |
| FOR_EACH_VEC_ELT (subst_list, i, s) |
| TYPE_SIZE (new_type) |
| = SUBSTITUTE_IN_EXPR (TYPE_SIZE (new_type), |
| s->discriminant, s->replacement); |
| |
| if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE_UNIT (new_type))) |
| FOR_EACH_VEC_ELT (subst_list, i, s) |
| TYPE_SIZE_UNIT (new_type) |
| = SUBSTITUTE_IN_EXPR (TYPE_SIZE_UNIT (new_type), |
| s->discriminant, s->replacement); |
| |
| if (CONTAINS_PLACEHOLDER_P (TYPE_ADA_SIZE (new_type))) |
| FOR_EACH_VEC_ELT (subst_list, i, s) |
| SET_TYPE_ADA_SIZE |
| (new_type, SUBSTITUTE_IN_EXPR (TYPE_ADA_SIZE (new_type), |
| s->discriminant, s->replacement)); |
| |
| /* Finalize the size. */ |
| TYPE_SIZE (new_type) = variable_size (TYPE_SIZE (new_type)); |
| TYPE_SIZE_UNIT (new_type) = variable_size (TYPE_SIZE_UNIT (new_type)); |
| } |
| |
| /* Return true if DISC is a stored discriminant of RECORD_TYPE. */ |
| |
| static inline bool |
| is_stored_discriminant (Entity_Id discr, Entity_Id record_type) |
| { |
| if (Is_Unchecked_Union (record_type)) |
| return false; |
| else if (Is_Tagged_Type (record_type)) |
| return No (Corresponding_Discriminant (discr)); |
| else if (Ekind (record_type) == E_Record_Type) |
| return Original_Record_Component (discr) == discr; |
| else |
| return true; |
| } |
| |
| /* Copy the layout from {GNAT,GNU}_OLD_TYPE to {GNAT,GNU}_NEW_TYPE, which are |
| both record types, after applying the substitutions described in SUBST_LIST. |
| DEBUG_INFO_P is true if we need to write debug information for NEW_TYPE. */ |
| |
| static void |
| copy_and_substitute_in_layout (Entity_Id gnat_new_type, |
| Entity_Id gnat_old_type, |
| tree gnu_new_type, |
| tree gnu_old_type, |
| vec<subst_pair> gnu_subst_list, |
| bool debug_info_p) |
| { |
| const bool is_subtype = (Ekind (gnat_new_type) == E_Record_Subtype); |
| tree gnu_field_list = NULL_TREE; |
| tree gnu_variable_field_list = NULL_TREE; |
| bool selected_variant; |
| vec<variant_desc> gnu_variant_list; |
| |
| /* Look for REP and variant parts in the old type. */ |
| tree gnu_rep_part = get_rep_part (gnu_old_type); |
| tree gnu_variant_part = get_variant_part (gnu_old_type); |
| |
| /* If there is a variant part, we must compute whether the constraints |
| statically select a particular variant. If so, we simply drop the |
| qualified union and flatten the list of fields. Otherwise we will |
| build a new qualified union for the variants that are still relevant. */ |
| if (gnu_variant_part) |
| { |
| variant_desc *v; |
| unsigned int i; |
| |
| gnu_variant_list = build_variant_list (TREE_TYPE (gnu_variant_part), |
| gnu_subst_list, vNULL); |
| |
| /* If all the qualifiers are unconditionally true, the innermost variant |
| is statically selected. */ |
| selected_variant = true; |
| FOR_EACH_VEC_ELT (gnu_variant_list, i, v) |
| if (!integer_onep (v->qual)) |
| { |
| selected_variant = false; |
| break; |
| } |
| |
| /* Otherwise, create the new variants. */ |
| if (!selected_variant) |
| FOR_EACH_VEC_ELT (gnu_variant_list, i, v) |
| { |
| tree old_variant = v->type; |
| tree new_variant = make_node (RECORD_TYPE); |
| tree suffix |
| = concat_name (DECL_NAME (gnu_variant_part), |
| IDENTIFIER_POINTER (DECL_NAME (v->field))); |
| TYPE_NAME (new_variant) |
| = concat_name (TYPE_NAME (gnu_new_type), |
| IDENTIFIER_POINTER (suffix)); |
| TYPE_REVERSE_STORAGE_ORDER (new_variant) |
| = TYPE_REVERSE_STORAGE_ORDER (gnu_new_type); |
| copy_and_substitute_in_size (new_variant, old_variant, |
| gnu_subst_list); |
| v->new_type = new_variant; |
| } |
| } |
| else |
| { |
| gnu_variant_list.create (0); |
| selected_variant = false; |
| } |
| |
| /* Make a list of fields and their position in the old type. */ |
| tree gnu_pos_list |
| = build_position_list (gnu_old_type, |
| gnu_variant_list.exists () && !selected_variant, |
| size_zero_node, bitsize_zero_node, |
| BIGGEST_ALIGNMENT, NULL_TREE); |
| |
| /* Now go down every component in the new type and compute its size and |
| position from those of the component in the old type and the stored |
| constraints of the new type. */ |
| Entity_Id gnat_field, gnat_old_field; |
| for (gnat_field = First_Entity (gnat_new_type); |
| Present (gnat_field); |
| gnat_field = Next_Entity (gnat_field)) |
| if ((Ekind (gnat_field) == E_Component |
| || (Ekind (gnat_field) == E_Discriminant |
| && is_stored_discriminant (gnat_field, gnat_new_type))) |
| && (gnat_old_field = is_subtype |
| ? Original_Record_Component (gnat_field) |
| : Corresponding_Record_Component (gnat_field)) |
| && Underlying_Type (Scope (gnat_old_field)) == gnat_old_type |
| && present_gnu_tree (gnat_old_field)) |
| { |
| Name_Id gnat_name = Chars (gnat_field); |
| tree gnu_old_field = get_gnu_tree (gnat_old_field); |
| if (TREE_CODE (gnu_old_field) == COMPONENT_REF) |
| gnu_old_field = TREE_OPERAND (gnu_old_field, 1); |
| tree gnu_context = DECL_CONTEXT (gnu_old_field); |
| tree gnu_field, gnu_field_type, gnu_size, gnu_pos; |
| tree gnu_cont_type, gnu_last = NULL_TREE; |
| variant_desc *v = NULL; |
| |
| /* If the type is the same, retrieve the GCC type from the |
| old field to take into account possible adjustments. */ |
| if (Etype (gnat_field) == Etype (gnat_old_field)) |
| gnu_field_type = TREE_TYPE (gnu_old_field); |
| else |
| gnu_field_type = gnat_to_gnu_type (Etype (gnat_field)); |
| |
| /* If there was a component clause, the field types must be the same |
| for the old and new types, so copy the data from the old field to |
| avoid recomputation here. Also if the field is justified modular |
| and the optimization in gnat_to_gnu_field was applied. */ |
| if (Present (Component_Clause (gnat_old_field)) |
| || (TREE_CODE (gnu_field_type) == RECORD_TYPE |
| && TYPE_JUSTIFIED_MODULAR_P (gnu_field_type) |
| && TREE_TYPE (TYPE_FIELDS (gnu_field_type)) |
| == TREE_TYPE (gnu_old_field))) |
| { |
| gnu_size = DECL_SIZE (gnu_old_field); |
| gnu_field_type = TREE_TYPE (gnu_old_field); |
| } |
| |
| /* If the old field was packed and of constant size, we have to get the |
| old size here as it might differ from what the Etype conveys and the |
| latter might overlap with the following field. Try to arrange the |
| type for possible better packing along the way. */ |
| else if (DECL_PACKED (gnu_old_field) |
| && TREE_CODE (DECL_SIZE (gnu_old_field)) == INTEGER_CST) |
| { |
| gnu_size = DECL_SIZE (gnu_old_field); |
| if (RECORD_OR_UNION_TYPE_P (gnu_field_type) |
| && !TYPE_FAT_POINTER_P (gnu_field_type) |
| && tree_fits_uhwi_p (TYPE_SIZE (gnu_field_type))) |
| gnu_field_type = make_packable_type (gnu_field_type, true); |
| } |
| |
| else |
| gnu_size = TYPE_SIZE (gnu_field_type); |
| |
| /* If the context of the old field is the old type or its REP part, |
| put the field directly in the new type; otherwise look up the |
| context in the variant list and put the field either in the new |
| type if there is a selected variant or in one new variant. */ |
| if (gnu_context == gnu_old_type |
| || (gnu_rep_part && gnu_context == TREE_TYPE (gnu_rep_part))) |
| gnu_cont_type = gnu_new_type; |
| else |
| { |
| unsigned int i; |
| tree rep_part; |
| |
| FOR_EACH_VEC_ELT (gnu_variant_list, i, v) |
| if (gnu_context == v->type |
| || ((rep_part = get_rep_part (v->type)) |
| && gnu_context == TREE_TYPE (rep_part))) |
| break; |
| |
| if (v) |
| gnu_cont_type = selected_variant ? gnu_new_type : v->new_type; |
| else |
| /* The front-end may pass us zombie components if it fails to |
| recognize that a constrain statically selects a particular |
| variant. Discard them. */ |
| continue; |
| } |
| |
| /* Now create the new field modeled on the old one. */ |
| gnu_field |
| = create_field_decl_from (gnu_old_field, gnu_field_type, |
| gnu_cont_type, gnu_size, |
| gnu_pos_list, gnu_subst_list); |
| gnu_pos = DECL_FIELD_OFFSET (gnu_field); |
| |
| /* If the context is a variant, put it in the new variant directly. */ |
| if (gnu_cont_type != gnu_new_type) |
| { |
| if (TREE_CODE (gnu_pos) == INTEGER_CST) |
| { |
| DECL_CHAIN (gnu_field) = TYPE_FIELDS (gnu_cont_type); |
| TYPE_FIELDS (gnu_cont_type) = gnu_field; |
| } |
| else |
| { |
| DECL_CHAIN (gnu_field) = v->aux; |
| v->aux = gnu_field; |
| } |
| } |
| |
| /* To match the layout crafted in components_to_record, if this is |
| the _Tag or _Parent field, put it before any other fields. */ |
| else if (gnat_name == Name_uTag || gnat_name == Name_uParent) |
| gnu_field_list = chainon (gnu_field_list, gnu_field); |
| |
| /* Similarly, if this is the _Controller field, put it before the |
| other fields except for the _Tag or _Parent field. */ |
| else if (gnat_name == Name_uController && gnu_last) |
| { |
| DECL_CHAIN (gnu_field) = DECL_CHAIN (gnu_last); |
| DECL_CHAIN (gnu_last) = gnu_field; |
| } |
| |
| /* Otherwise, put it after the other fields. */ |
| else |
| { |
| if (TREE_CODE (gnu_pos) == INTEGER_CST) |
| { |
| DECL_CHAIN (gnu_field) = gnu_field_list; |
| gnu_field_list = gnu_field; |
| if (!gnu_last) |
| gnu_last = gnu_field; |
| } |
| else |
| { |
| DECL_CHAIN (gnu_field) = gnu_variable_field_list; |
| gnu_variable_field_list = gnu_field; |
| } |
| } |
| |
| /* For a stored discriminant in a derived type, replace the field. */ |
| if (!is_subtype && Ekind (gnat_field) == E_Discriminant) |
| { |
| tree gnu_ref = get_gnu_tree (gnat_field); |
| TREE_OPERAND (gnu_ref, 1) = gnu_field; |
| } |
| else |
| save_gnu_tree (gnat_field, gnu_field, false); |
| } |
| |
| /* Put the fields with fixed position in order of increasing position. */ |
| if (gnu_field_list) |
| gnu_field_list = reverse_sort_field_list (gnu_field_list); |
| |
| /* Put the fields with variable position at the end. */ |
| if (gnu_variable_field_list) |
| gnu_field_list = chainon (gnu_variable_field_list, gnu_field_list); |
| |
| /* If there is a variant list and no selected variant, we need to create the |
| nest of variant parts from the old nest. */ |
| if (gnu_variant_list.exists () && !selected_variant) |
| { |
| variant_desc *v; |
| unsigned int i; |
| |
| /* Same processing as above for the fields of each variant. */ |
| FOR_EACH_VEC_ELT (gnu_variant_list, i, v) |
| { |
| if (TYPE_FIELDS (v->new_type)) |
| TYPE_FIELDS (v->new_type) |
| = reverse_sort_field_list (TYPE_FIELDS (v->new_type)); |
| if (v->aux) |
| TYPE_FIELDS (v->new_type) |
| = chainon (v->aux, TYPE_FIELDS (v->new_type)); |
| } |
| |
| tree new_variant_part |
| = create_variant_part_from (gnu_variant_part, gnu_variant_list, |
| gnu_new_type, gnu_pos_list, |
| gnu_subst_list, debug_info_p); |
| DECL_CHAIN (new_variant_part) = gnu_field_list; |
| gnu_field_list = new_variant_part; |
| } |
| |
| gnu_variant_list.release (); |
| gnu_subst_list.release (); |
| |
| /* If NEW_TYPE is a subtype, it inherits all the attributes from OLD_TYPE. |
| Otherwise sizes and alignment must be computed independently. */ |
| finish_record_type (gnu_new_type, nreverse (gnu_field_list), |
| is_subtype ? 2 : 1, debug_info_p); |
| |
| /* Now go through the entities again looking for Itypes that we have not yet |
| elaborated (e.g. Etypes of fields that have Original_Components). */ |
| for (Entity_Id gnat_field = First_Entity (gnat_new_type); |
| Present (gnat_field); |
| gnat_field = Next_Entity (gnat_field)) |
| if ((Ekind (gnat_field) == E_Component |
| || Ekind (gnat_field) == E_Discriminant) |
| && Is_Itype (Etype (gnat_field)) |
| && !present_gnu_tree (Etype (gnat_field))) |
| gnat_to_gnu_entity (Etype (gnat_field), NULL_TREE, false); |
| } |
| |
| /* Associate to GNU_TYPE, the translation of GNAT_ENTITY, which is |
| the implementation type of a packed array type (Is_Packed_Array_Impl_Type), |
| the original array type if it has been translated. This association is a |
| parallel type for GNAT encodings or a debug type for standard DWARF. Note |
| that for standard DWARF, we also want to get the original type name. */ |
| |
| static void |
| associate_original_type_to_packed_array (tree gnu_type, Entity_Id gnat_entity) |
| { |
| Entity_Id gnat_original_array_type |
| = Underlying_Type (Original_Array_Type (gnat_entity)); |
| tree gnu_original_array_type; |
| |
| if (!present_gnu_tree (gnat_original_array_type)) |
| return; |
| |
| gnu_original_array_type = gnat_to_gnu_type (gnat_original_array_type); |
| |
| if (TYPE_IS_DUMMY_P (gnu_original_array_type)) |
| return; |
| |
| if (gnat_encodings == DWARF_GNAT_ENCODINGS_MINIMAL) |
| { |
| tree original_name = TYPE_NAME (gnu_original_array_type); |
| |
| if (TREE_CODE (original_name) == TYPE_DECL) |
| original_name = DECL_NAME (original_name); |
| |
| SET_TYPE_ORIGINAL_PACKED_ARRAY (gnu_type, gnu_original_array_type); |
| TYPE_NAME (gnu_type) = original_name; |
| } |
| else |
| add_parallel_type (gnu_type, gnu_original_array_type); |
| } |
| |
| /* Given a type T, a FIELD_DECL F, and a replacement value R, return an |
| equivalent type with adjusted size expressions where all occurrences |
| of references to F in a PLACEHOLDER_EXPR have been replaced by R. |
| |
| The function doesn't update the layout of the type, i.e. it assumes |
| that the substitution is purely formal. That's why the replacement |
| value R must itself contain a PLACEHOLDER_EXPR. */ |
| |
| tree |
| substitute_in_type (tree t, tree f, tree r) |
| { |
| tree nt; |
| |
| gcc_assert (CONTAINS_PLACEHOLDER_P (r)); |
| |
| switch (TREE_CODE (t)) |
| { |
| case INTEGER_TYPE: |
| case ENUMERAL_TYPE: |
| case BOOLEAN_TYPE: |
| case REAL_TYPE: |
| |
| /* First the domain types of arrays. */ |
| if (CONTAINS_PLACEHOLDER_P (TYPE_GCC_MIN_VALUE (t)) |
| || CONTAINS_PLACEHOLDER_P (TYPE_GCC_MAX_VALUE (t))) |
| { |
| tree low = SUBSTITUTE_IN_EXPR (TYPE_GCC_MIN_VALUE (t), f, r); |
| tree high = SUBSTITUTE_IN_EXPR (TYPE_GCC_MAX_VALUE (t), f, r); |
| |
| if (low == TYPE_GCC_MIN_VALUE (t) && high == TYPE_GCC_MAX_VALUE (t)) |
| return t; |
| |
| nt = copy_type (t); |
| TYPE_GCC_MIN_VALUE (nt) = low; |
| TYPE_GCC_MAX_VALUE (nt) = high; |
| |
| if (TREE_CODE (t) == INTEGER_TYPE && TYPE_INDEX_TYPE (t)) |
| SET_TYPE_INDEX_TYPE |
| (nt, substitute_in_type (TYPE_INDEX_TYPE (t), f, r)); |
| |
| return nt; |
| } |
| |
| /* Then the subtypes. */ |
| if (CONTAINS_PLACEHOLDER_P (TYPE_RM_MIN_VALUE (t)) |
| || CONTAINS_PLACEHOLDER_P (TYPE_RM_MAX_VALUE (t))) |
| { |
| tree low = SUBSTITUTE_IN_EXPR (TYPE_RM_MIN_VALUE (t), f, r); |
| tree high = SUBSTITUTE_IN_EXPR (TYPE_RM_MAX_VALUE (t), f, r); |
| |
| if (low == TYPE_RM_MIN_VALUE (t) && high == TYPE_RM_MAX_VALUE (t)) |
| return t; |
| |
| nt = copy_type (t); |
| SET_TYPE_RM_MIN_VALUE (nt, low); |
| SET_TYPE_RM_MAX_VALUE (nt, high); |
| |
| return nt; |
| } |
| |
| return t; |
| |
| case COMPLEX_TYPE: |
| nt = substitute_in_type (TREE_TYPE (t), f, r); |
| if (nt == TREE_TYPE (t)) |
| return t; |
| |
| return build_complex_type (nt); |
| |
| case FUNCTION_TYPE: |
| case METHOD_TYPE: |
| /* These should never show up here. */ |
| gcc_unreachable (); |
| |
| case ARRAY_TYPE: |
| { |
| tree component = substitute_in_type (TREE_TYPE (t), f, r); |
| tree domain = substitute_in_type (TYPE_DOMAIN (t), f, r); |
| |
| if (component == TREE_TYPE (t) && domain == TYPE_DOMAIN (t)) |
| return t; |
| |
| nt = build_nonshared_array_type (component, domain); |
| SET_TYPE_ALIGN (nt, TYPE_ALIGN (t)); |
| TYPE_USER_ALIGN (nt) = TYPE_USER_ALIGN (t); |
| SET_TYPE_MODE (nt, TYPE_MODE (t)); |
| TYPE_SIZE (nt) = SUBSTITUTE_IN_EXPR (TYPE_SIZE (t), f, r); |
| TYPE_SIZE_UNIT (nt) = SUBSTITUTE_IN_EXPR (TYPE_SIZE_UNIT (t), f, r); |
| TYPE_MULTI_ARRAY_P (nt) = TYPE_MULTI_ARRAY_P (t); |
| TYPE_CONVENTION_FORTRAN_P (nt) = TYPE_CONVENTION_FORTRAN_P (t); |
| if (TYPE_REVERSE_STORAGE_ORDER (t)) |
| set_reverse_storage_order_on_array_type (nt); |
| if (TYPE_NONALIASED_COMPONENT (t)) |
| set_nonaliased_component_on_array_type (nt); |
| return nt; |
| } |
| |
| case RECORD_TYPE: |
| case UNION_TYPE: |
| case QUAL_UNION_TYPE: |
| { |
| bool changed_field = false; |
| tree field; |
| |
| /* Start out with no fields, make new fields, and chain them |
| in. If we haven't actually changed the type of any field, |
| discard everything we've done and return the old type. */ |
| nt = copy_type (t); |
| TYPE_FIELDS (nt) = NULL_TREE; |
| |
| for (field = TYPE_FIELDS (t); field; field = DECL_CHAIN (field)) |
| { |
| tree new_field = copy_node (field), new_n; |
| |
| new_n = substitute_in_type (TREE_TYPE (field), f, r); |
| if (new_n != TREE_TYPE (field)) |
| { |
| TREE_TYPE (new_field) = new_n; |
| changed_field = true; |
| } |
| |
| new_n = SUBSTITUTE_IN_EXPR (DECL_FIELD_OFFSET (field), f, r); |
| if (new_n != DECL_FIELD_OFFSET (field)) |
| { |
| DECL_FIELD_OFFSET (new_field) = new_n; |
| changed_field = true; |
| } |
| |
| /* Do the substitution inside the qualifier, if any. */ |
| if (TREE_CODE (t) == QUAL_UNION_TYPE) |
| { |
| new_n = SUBSTITUTE_IN_EXPR (DECL_QUALIFIER (field), f, r); |
| if (new_n != DECL_QUALIFIER (field)) |
| { |
| DECL_QUALIFIER (new_field) = new_n; |
| changed_field = true; |
| } |
| } |
| |
| DECL_CONTEXT (new_field) = nt; |
| SET_DECL_ORIGINAL_FIELD_TO_FIELD (new_field, field); |
| |
| DECL_CHAIN (new_field) = TYPE_FIELDS (nt); |
| TYPE_FIELDS (nt) = new_field; |
| } |
| |
| if (!changed_field) |
| return t; |
| |
| TYPE_FIELDS (nt) = nreverse (TYPE_FIELDS (nt)); |
| TYPE_SIZE (nt) = SUBSTITUTE_IN_EXPR (TYPE_SIZE (t), f, r); |
| TYPE_SIZE_UNIT (nt) = SUBSTITUTE_IN_EXPR (TYPE_SIZE_UNIT (t), f, r); |
| SET_TYPE_ADA_SIZE (nt, SUBSTITUTE_IN_EXPR (TYPE_ADA_SIZE (t), f, r)); |
| return nt; |
| } |
| |
| default: |
| return t; |
| } |
| } |
| |
| /* Return the RM size of GNU_TYPE. This is the actual number of bits |
| needed to represent the object. */ |
| |
| tree |
| rm_size (tree gnu_type) |
| { |
| /* For integral types, we store the RM size explicitly. */ |
| if (INTEGRAL_TYPE_P (gnu_type) && TYPE_RM_SIZE (gnu_type)) |
| return TYPE_RM_SIZE (gnu_type); |
| |
| /* Return the RM size of the actual data plus the size of the template. */ |
| if (TREE_CODE (gnu_type) == RECORD_TYPE |
| && TYPE_CONTAINS_TEMPLATE_P (gnu_type)) |
| return |
| size_binop (PLUS_EXPR, |
| rm_size (TREE_TYPE (DECL_CHAIN (TYPE_FIELDS (gnu_type)))), |
| DECL_SIZE (TYPE_FIELDS (gnu_type))); |
| |
| /* For record or union types, we store the size explicitly. */ |
| if (RECORD_OR_UNION_TYPE_P (gnu_type) |
| && !TYPE_FAT_POINTER_P (gnu_type) |
| && TYPE_ADA_SIZE (gnu_type)) |
| return TYPE_ADA_SIZE (gnu_type); |
| |
| /* For other types, this is just the size. */ |
| return TYPE_SIZE (gnu_type); |
| } |
| |
| /* Return the name to be used for GNAT_ENTITY. If a type, create a |
| fully-qualified name, possibly with type information encoding. |
| Otherwise, return the name. */ |
| |
| static const char * |
| get_entity_char (Entity_Id gnat_entity) |
| { |
| Get_Encoded_Name (gnat_entity); |
| return ggc_strdup (Name_Buffer); |
| } |
| |
| tree |
| get_entity_name (Entity_Id gnat_entity) |
| { |
| Get_Encoded_Name (gnat_entity); |
| return get_identifier_with_length (Name_Buffer, Name_Len); |
| } |
| |
| /* Return an identifier representing the external name to be used for |
| GNAT_ENTITY. If SUFFIX is specified, the name is followed by "___" |
| and the specified suffix. */ |
| |
| tree |
| create_concat_name (Entity_Id gnat_entity, const char *suffix) |
| { |
| const Entity_Kind kind = Ekind (gnat_entity); |
| const bool has_suffix = (suffix != NULL); |
| String_Template temp = {1, has_suffix ? strlen (suffix) : 0}; |
| String_Pointer sp = {suffix, &temp}; |
| |
| Get_External_Name (gnat_entity, has_suffix, sp); |
| |
| /* A variable using the Stdcall convention lives in a DLL. We adjust |
| its name to use the jump table, the _imp__NAME contains the address |
| for the NAME variable. */ |
| if ((kind == E_Variable || kind == E_Constant) |
| && Has_Stdcall_Convention (gnat_entity)) |
| { |
| const int len = strlen (STDCALL_PREFIX) + Name_Len; |
| char *new_name = (char *) alloca (len + 1); |
| strcpy (new_name, STDCALL_PREFIX); |
| strcat (new_name, Name_Buffer); |
| return get_identifier_with_length (new_name, len); |
| } |
| |
| return get_identifier_with_length (Name_Buffer, Name_Len); |
| } |
| |
| /* Given GNU_NAME, an IDENTIFIER_NODE containing a name and SUFFIX, a |
| string, return a new IDENTIFIER_NODE that is the concatenation of |
| the name followed by "___" and the specified suffix. */ |
| |
| tree |
| concat_name (tree gnu_name, const char *suffix) |
| { |
| const int len = IDENTIFIER_LENGTH (gnu_name) + 3 + strlen (suffix); |
| char *new_name = (char *) alloca (len + 1); |
| strcpy (new_name, IDENTIFIER_POINTER (gnu_name)); |
| strcat (new_name, "___"); |
| strcat (new_name, suffix); |
| return get_identifier_with_length (new_name, len); |
| } |
| |
| /* Initialize data structures of the decl.c module. */ |
| |
| void |
| init_gnat_decl (void) |
| { |
| /* Initialize the cache of annotated values. */ |
| annotate_value_cache = hash_table<value_annotation_hasher>::create_ggc (512); |
| |
| /* Initialize the association of dummy types with subprograms. */ |
| dummy_to_subprog_map = hash_table<dummy_type_hasher>::create_ggc (512); |
| } |
| |
| /* Destroy data structures of the decl.c module. */ |
| |
| void |
| destroy_gnat_decl (void) |
| { |
| /* Destroy the cache of annotated values. */ |
| annotate_value_cache->empty (); |
| annotate_value_cache = NULL; |
| |
| /* Destroy the association of dummy types with subprograms. */ |
| dummy_to_subprog_map->empty (); |
| dummy_to_subprog_map = NULL; |
| } |
| |
| #include "gt-ada-decl.h" |