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gnu / gcc / a8404c07e7fca388c02c39077865f7d5fa928430 / . / gcc / ada / exp_ch3.adb
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------------------------------------------------------------------------------
-- --
-- GNAT COMPILER COMPONENTS --
-- --
-- E X P _ C H 3 --
-- --
-- B o d y --
-- --
-- Copyright (C) 1992-2022, 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 distributed with GNAT; see file COPYING3. If not, go to --
-- http://www.gnu.org/licenses for a complete copy of the license. --
-- --
-- GNAT was originally developed by the GNAT team at New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc. --
-- --
------------------------------------------------------------------------------
with Aspects; use Aspects;
with Atree; use Atree;
with Checks; use Checks;
with Contracts; use Contracts;
with Einfo; use Einfo;
with Einfo.Entities; use Einfo.Entities;
with Einfo.Utils; use Einfo.Utils;
with Errout; use Errout;
with Expander; use Expander;
with Exp_Aggr; use Exp_Aggr;
with Exp_Atag; use Exp_Atag;
with Exp_Ch4; use Exp_Ch4;
with Exp_Ch6; use Exp_Ch6;
with Exp_Ch7; use Exp_Ch7;
with Exp_Ch9; use Exp_Ch9;
with Exp_Dbug; use Exp_Dbug;
with Exp_Disp; use Exp_Disp;
with Exp_Dist; use Exp_Dist;
with Exp_Put_Image;
with Exp_Smem; use Exp_Smem;
with Exp_Strm; use Exp_Strm;
with Exp_Util; use Exp_Util;
with Freeze; use Freeze;
with Ghost; use Ghost;
with Lib; use Lib;
with Namet; use Namet;
with Nlists; use Nlists;
with Nmake; use Nmake;
with Opt; use Opt;
with Restrict; use Restrict;
with Rident; use Rident;
with Rtsfind; use Rtsfind;
with Sem; use Sem;
with Sem_Aux; use Sem_Aux;
with Sem_Attr; use Sem_Attr;
with Sem_Cat; use Sem_Cat;
with Sem_Ch3; use Sem_Ch3;
with Sem_Ch6; use Sem_Ch6;
with Sem_Ch8; use Sem_Ch8;
with Sem_Disp; use Sem_Disp;
with Sem_Eval; use Sem_Eval;
with Sem_Mech; use Sem_Mech;
with Sem_Res; use Sem_Res;
with Sem_SCIL; use Sem_SCIL;
with Sem_Type; use Sem_Type;
with Sem_Util; use Sem_Util;
with Sinfo; use Sinfo;
with Sinfo.Nodes; use Sinfo.Nodes;
with Sinfo.Utils; use Sinfo.Utils;
with Stand; use Stand;
with Snames; use Snames;
with Tbuild; use Tbuild;
with Ttypes; use Ttypes;
with Validsw; use Validsw;
package body Exp_Ch3 is
-----------------------
-- Local Subprograms --
-----------------------
procedure Adjust_Discriminants (Rtype : Entity_Id);
-- This is used when freezing a record type. It attempts to construct
-- more restrictive subtypes for discriminants so that the max size of
-- the record can be calculated more accurately. See the body of this
-- procedure for details.
procedure Build_Array_Init_Proc (A_Type : Entity_Id; Nod : Node_Id);
-- Build initialization procedure for given array type. Nod is a node
-- used for attachment of any actions required in its construction.
-- It also supplies the source location used for the procedure.
function Build_Discriminant_Formals
(Rec_Id : Entity_Id;
Use_Dl : Boolean) return List_Id;
-- This function uses the discriminants of a type to build a list of
-- formal parameters, used in Build_Init_Procedure among other places.
-- If the flag Use_Dl is set, the list is built using the already
-- defined discriminals of the type, as is the case for concurrent
-- types with discriminants. Otherwise new identifiers are created,
-- with the source names of the discriminants.
procedure Build_Discr_Checking_Funcs (N : Node_Id);
-- For each variant component, builds a function which checks whether
-- the component name is consistent with the current discriminants
-- and sets the component's Dcheck_Function attribute to refer to it.
-- N is the full type declaration node; the discriminant checking
-- functions are inserted after this node.
function Build_Equivalent_Array_Aggregate (T : Entity_Id) return Node_Id;
-- This function builds a static aggregate that can serve as the initial
-- value for an array type whose bounds are static, and whose component
-- type is a composite type that has a static equivalent aggregate.
-- The equivalent array aggregate is used both for object initialization
-- and for component initialization, when used in the following function.
function Build_Equivalent_Record_Aggregate (T : Entity_Id) return Node_Id;
-- This function builds a static aggregate that can serve as the initial
-- value for a record type whose components are scalar and initialized
-- with compile-time values, or arrays with similar initialization or
-- defaults. When possible, initialization of an object of the type can
-- be achieved by using a copy of the aggregate as an initial value, thus
-- removing the implicit call that would otherwise constitute elaboration
-- code.
procedure Build_Record_Init_Proc (N : Node_Id; Rec_Ent : Entity_Id);
-- Build record initialization procedure. N is the type declaration
-- node, and Rec_Ent is the corresponding entity for the record type.
procedure Build_Slice_Assignment (Typ : Entity_Id);
-- Build assignment procedure for one-dimensional arrays of controlled
-- types. Other array and slice assignments are expanded in-line, but
-- the code expansion for controlled components (when control actions
-- are active) can lead to very large blocks that GCC handles poorly.
procedure Build_Untagged_Equality (Typ : Entity_Id);
-- AI05-0123: Equality on untagged records composes. This procedure
-- builds the equality routine for an untagged record that has components
-- of a record type that has user-defined primitive equality operations.
-- The resulting operation is a TSS subprogram.
procedure Check_Stream_Attributes (Typ : Entity_Id);
-- Check that if a limited extension has a parent with user-defined stream
-- attributes, and does not itself have user-defined stream-attributes,
-- then any limited component of the extension also has the corresponding
-- user-defined stream attributes.
procedure Clean_Task_Names
(Typ : Entity_Id;
Proc_Id : Entity_Id);
-- If an initialization procedure includes calls to generate names
-- for task subcomponents, indicate that secondary stack cleanup is
-- needed after an initialization. Typ is the component type, and Proc_Id
-- the initialization procedure for the enclosing composite type.
procedure Copy_Discr_Checking_Funcs (N : Node_Id);
-- For a derived untagged type, copy the attributes that were set
-- for the components of the parent type onto the components of the
-- derived type. No new subprograms are constructed.
-- N is the full type declaration node, as for Build_Discr_Checking_Funcs.
procedure Expand_Freeze_Array_Type (N : Node_Id);
-- Freeze an array type. Deals with building the initialization procedure,
-- creating the packed array type for a packed array and also with the
-- creation of the controlling procedures for the controlled case. The
-- argument N is the N_Freeze_Entity node for the type.
procedure Expand_Freeze_Class_Wide_Type (N : Node_Id);
-- Freeze a class-wide type. Build routine Finalize_Address for the purpose
-- of finalizing controlled derivations from the class-wide's root type.
procedure Expand_Freeze_Enumeration_Type (N : Node_Id);
-- Freeze enumeration type with non-standard representation. Builds the
-- array and function needed to convert between enumeration pos and
-- enumeration representation values. N is the N_Freeze_Entity node
-- for the type.
procedure Expand_Freeze_Record_Type (N : Node_Id);
-- Freeze record type. Builds all necessary discriminant checking
-- and other ancillary functions, and builds dispatch tables where
-- needed. The argument N is the N_Freeze_Entity node. This processing
-- applies only to E_Record_Type entities, not to class wide types,
-- record subtypes, or private types.
procedure Expand_Tagged_Root (T : Entity_Id);
-- Add a field _Tag at the beginning of the record. This field carries
-- the value of the access to the Dispatch table. This procedure is only
-- called on root type, the _Tag field being inherited by the descendants.
procedure Freeze_Stream_Operations (N : Node_Id; Typ : Entity_Id);
-- Treat user-defined stream operations as renaming_as_body if the
-- subprogram they rename is not frozen when the type is frozen.
package Initialization_Control is
function Requires_Late_Init
(Decl : Node_Id; Rec_Type : Entity_Id) return Boolean;
-- Return True iff the given component declaration requires late
-- initialization, as defined by 3.3.1 (8.1/5).
function Has_Late_Init_Component
(Tagged_Rec_Type : Entity_Id) return Boolean;
-- Return True iff the given tagged record type has at least one
-- component that requires late initialization; this includes
-- components of ancestor types.
type Initialization_Mode is
(Full_Init, Full_Init_Except_Tag, Early_Init_Only, Late_Init_Only);
-- The initialization routine for a tagged type is passed in a
-- formal parameter of this type, indicating what initialization
-- is to be performed. This parameter defaults to Full_Init in all
-- cases except when the init proc of a type extension (let's call
-- that type T2) calls the init proc of its parent (let's call that
-- type T1). In that case, one of the other 3 values will
-- be passed in. In all three of those cases, the Tag component has
-- already been initialized before the call and is therefore not to be
-- modified. T2's init proc will either call T1's init proc
-- once (with Full_Init_Except_Tag as the parameter value) or twice
-- (first with Early_Init_Only, then later with Late_Init_Only),
-- depending on the result returned by Has_Late_Init_Component (T1).
-- In the latter case, the first call does not initialize any
-- components that require late initialization and the second call
-- then performs that deferred initialization.
-- Strictly speaking, the formal parameter subtype is actually Natural
-- but calls will only pass in values corresponding to literals
-- of this enumeration type.
function Make_Mode_Literal
(Loc : Source_Ptr; Mode : Initialization_Mode) return Node_Id
is (Make_Integer_Literal (Loc, Initialization_Mode'Pos (Mode)));
-- Generate an integer literal for a given mode value.
function Tag_Init_Condition
(Loc : Source_Ptr;
Init_Control_Formal : Entity_Id) return Node_Id;
function Early_Init_Condition
(Loc : Source_Ptr;
Init_Control_Formal : Entity_Id) return Node_Id;
function Late_Init_Condition
(Loc : Source_Ptr;
Init_Control_Formal : Entity_Id) return Node_Id;
-- These three functions each return a Boolean expression that
-- can be used to determine whether a given call to the initialization
-- expression for a tagged type should initialize (respectively)
-- the Tag component, the non-Tag components that do not require late
-- initialization, and the components that do require late
-- initialization.
end Initialization_Control;
procedure Initialization_Warning (E : Entity_Id);
-- If static elaboration of the package is requested, indicate
-- when a type does meet the conditions for static initialization. If
-- E is a type, it has components that have no static initialization.
-- if E is an entity, its initial expression is not compile-time known.
function Init_Formals (Typ : Entity_Id; Proc_Id : Entity_Id) return List_Id;
-- This function builds the list of formals for an initialization routine.
-- The first formal is always _Init with the given type. For task value
-- record types and types containing tasks, three additional formals are
-- added and Proc_Id is decorated with attribute Has_Master_Entity:
--
-- _Master : Master_Id
-- _Chain : in out Activation_Chain
-- _Task_Name : String
--
-- The caller must append additional entries for discriminants if required.
function Inline_Init_Proc (Typ : Entity_Id) return Boolean;
-- Returns true if the initialization procedure of Typ should be inlined
function In_Runtime (E : Entity_Id) return Boolean;
-- Check if E is defined in the RTL (in a child of Ada or System). Used
-- to avoid to bring in the overhead of _Input, _Output for tagged types.
function Is_Null_Statement_List (Stmts : List_Id) return Boolean;
-- Returns true if Stmts is made of null statements only, possibly wrapped
-- in a case statement, recursively. This latter pattern may occur for the
-- initialization procedure of an unchecked union.
function Make_Eq_Body
(Typ : Entity_Id;
Eq_Name : Name_Id) return Node_Id;
-- Build the body of a primitive equality operation for a tagged record
-- type, or in Ada 2012 for any record type that has components with a
-- user-defined equality. Factored out of Predefined_Primitive_Bodies.
function Make_Eq_Case
(E : Entity_Id;
CL : Node_Id;
Discrs : Elist_Id := New_Elmt_List) return List_Id;
-- Building block for variant record equality. Defined to share the code
-- between the tagged and untagged case. Given a Component_List node CL,
-- it generates an 'if' followed by a 'case' statement that compares all
-- components of local temporaries named X and Y (that are declared as
-- formals at some upper level). E provides the Sloc to be used for the
-- generated code.
--
-- IF E is an unchecked_union, Discrs is the list of formals created for
-- the inferred discriminants of one operand. These formals are used in
-- the generated case statements for each variant of the unchecked union.
function Make_Eq_If
(E : Entity_Id;
L : List_Id) return Node_Id;
-- Building block for variant record equality. Defined to share the code
-- between the tagged and untagged case. Given the list of components
-- (or discriminants) L, it generates a return statement that compares all
-- components of local temporaries named X and Y (that are declared as
-- formals at some upper level). E provides the Sloc to be used for the
-- generated code.
function Make_Neq_Body (Tag_Typ : Entity_Id) return Node_Id;
-- Search for a renaming of the inequality dispatching primitive of
-- this tagged type. If found then build and return the corresponding
-- rename-as-body inequality subprogram; otherwise return Empty.
procedure Make_Predefined_Primitive_Specs
(Tag_Typ : Entity_Id;
Predef_List : out List_Id;
Renamed_Eq : out Entity_Id);
-- Create a list with the specs of the predefined primitive operations.
-- For tagged types that are interfaces all these primitives are defined
-- abstract.
--
-- The following entries are present for all tagged types, and provide
-- the results of the corresponding attribute applied to the object.
-- Dispatching is required in general, since the result of the attribute
-- will vary with the actual object subtype.
--
-- _size provides result of 'Size attribute
-- typSR provides result of 'Read attribute
-- typSW provides result of 'Write attribute
-- typSI provides result of 'Input attribute
-- typSO provides result of 'Output attribute
-- typPI provides result of 'Put_Image attribute
--
-- The following entries are additionally present for non-limited tagged
-- types, and implement additional dispatching operations for predefined
-- operations:
--
-- _equality implements "=" operator
-- _assign implements assignment operation
-- typDF implements deep finalization
-- typDA implements deep adjust
--
-- The latter two are empty procedures unless the type contains some
-- controlled components that require finalization actions (the deep
-- in the name refers to the fact that the action applies to components).
--
-- The list of specs is returned in Predef_List
function Has_New_Non_Standard_Rep (T : Entity_Id) return Boolean;
-- Returns True if there are representation clauses for type T that are not
-- inherited. If the result is false, the init_proc and the discriminant
-- checking functions of the parent can be reused by a derived type.
function Make_Null_Procedure_Specs (Tag_Typ : Entity_Id) return List_Id;
-- Ada 2005 (AI-251): Makes specs for null procedures associated with any
-- null procedures inherited from an interface type that have not been
-- overridden. Only one null procedure will be created for a given set of
-- inherited null procedures with homographic profiles.
function Predef_Spec_Or_Body
(Loc : Source_Ptr;
Tag_Typ : Entity_Id;
Name : Name_Id;
Profile : List_Id;
Ret_Type : Entity_Id := Empty;
For_Body : Boolean := False) return Node_Id;
-- This function generates the appropriate expansion for a predefined
-- primitive operation specified by its name, parameter profile and
-- return type (Empty means this is a procedure). If For_Body is false,
-- then the returned node is a subprogram declaration. If For_Body is
-- true, then the returned node is a empty subprogram body containing
-- no declarations and no statements.
function Predef_Stream_Attr_Spec
(Loc : Source_Ptr;
Tag_Typ : Entity_Id;
Name : TSS_Name_Type) return Node_Id;
-- Specialized version of Predef_Spec_Or_Body that apply to read, write,
-- input and output attribute whose specs are constructed in Exp_Strm.
function Predef_Deep_Spec
(Loc : Source_Ptr;
Tag_Typ : Entity_Id;
Name : TSS_Name_Type;
For_Body : Boolean := False) return Node_Id;
-- Specialized version of Predef_Spec_Or_Body that apply to _deep_adjust
-- and _deep_finalize
function Predefined_Primitive_Bodies
(Tag_Typ : Entity_Id;
Renamed_Eq : Entity_Id) return List_Id;
-- Create the bodies of the predefined primitives that are described in
-- Predefined_Primitive_Specs. When not empty, Renamed_Eq must denote
-- the defining unit name of the type's predefined equality as returned
-- by Make_Predefined_Primitive_Specs.
function Predefined_Primitive_Freeze (Tag_Typ : Entity_Id) return List_Id;
-- Freeze entities of all predefined primitive operations. This is needed
-- because the bodies of these operations do not normally do any freezing.
--------------------------
-- Adjust_Discriminants --
--------------------------
-- This procedure attempts to define subtypes for discriminants that are
-- more restrictive than those declared. Such a replacement is possible if
-- we can demonstrate that values outside the restricted range would cause
-- constraint errors in any case. The advantage of restricting the
-- discriminant types in this way is that the maximum size of the variant
-- record can be calculated more conservatively.
-- An example of a situation in which we can perform this type of
-- restriction is the following:
-- subtype B is range 1 .. 10;
-- type Q is array (B range <>) of Integer;
-- type V (N : Natural) is record
-- C : Q (1 .. N);
-- end record;
-- In this situation, we can restrict the upper bound of N to 10, since
-- any larger value would cause a constraint error in any case.
-- There are many situations in which such restriction is possible, but
-- for now, we just look for cases like the above, where the component
-- in question is a one dimensional array whose upper bound is one of
-- the record discriminants. Also the component must not be part of
-- any variant part, since then the component does not always exist.
procedure Adjust_Discriminants (Rtype : Entity_Id) is
Loc : constant Source_Ptr := Sloc (Rtype);
Comp : Entity_Id;
Ctyp : Entity_Id;
Ityp : Entity_Id;
Lo : Node_Id;
Hi : Node_Id;
P : Node_Id;
Loval : Uint;
Discr : Entity_Id;
Dtyp : Entity_Id;
Dhi : Node_Id;
Dhiv : Uint;
Ahi : Node_Id;
Ahiv : Uint;
Tnn : Entity_Id;
begin
Comp := First_Component (Rtype);
while Present (Comp) loop
-- If our parent is a variant, quit, we do not look at components
-- that are in variant parts, because they may not always exist.
P := Parent (Comp); -- component declaration
P := Parent (P); -- component list
exit when Nkind (Parent (P)) = N_Variant;
-- We are looking for a one dimensional array type
Ctyp := Etype (Comp);
if not Is_Array_Type (Ctyp) or else Number_Dimensions (Ctyp) > 1 then
goto Continue;
end if;
-- The lower bound must be constant, and the upper bound is a
-- discriminant (which is a discriminant of the current record).
Ityp := Etype (First_Index (Ctyp));
Lo := Type_Low_Bound (Ityp);
Hi := Type_High_Bound (Ityp);
if not Compile_Time_Known_Value (Lo)
or else Nkind (Hi) /= N_Identifier
or else No (Entity (Hi))
or else Ekind (Entity (Hi)) /= E_Discriminant
then
goto Continue;
end if;
-- We have an array with appropriate bounds
Loval := Expr_Value (Lo);
Discr := Entity (Hi);
Dtyp := Etype (Discr);
-- See if the discriminant has a known upper bound
Dhi := Type_High_Bound (Dtyp);
if not Compile_Time_Known_Value (Dhi) then
goto Continue;
end if;
Dhiv := Expr_Value (Dhi);
-- See if base type of component array has known upper bound
Ahi := Type_High_Bound (Etype (First_Index (Base_Type (Ctyp))));
if not Compile_Time_Known_Value (Ahi) then
goto Continue;
end if;
Ahiv := Expr_Value (Ahi);
-- The condition for doing the restriction is that the high bound
-- of the discriminant is greater than the low bound of the array,
-- and is also greater than the high bound of the base type index.
if Dhiv > Loval and then Dhiv > Ahiv then
-- We can reset the upper bound of the discriminant type to
-- whichever is larger, the low bound of the component, or
-- the high bound of the base type array index.
-- We build a subtype that is declared as
-- subtype Tnn is discr_type range discr_type'First .. max;
-- And insert this declaration into the tree. The type of the
-- discriminant is then reset to this more restricted subtype.
Tnn := Make_Temporary (Loc, 'T');
Insert_Action (Declaration_Node (Rtype),
Make_Subtype_Declaration (Loc,
Defining_Identifier => Tnn,
Subtype_Indication =>
Make_Subtype_Indication (Loc,
Subtype_Mark => New_Occurrence_Of (Dtyp, Loc),
Constraint =>
Make_Range_Constraint (Loc,
Range_Expression =>
Make_Range (Loc,
Low_Bound =>
Make_Attribute_Reference (Loc,
Attribute_Name => Name_First,
Prefix => New_Occurrence_Of (Dtyp, Loc)),
High_Bound =>
Make_Integer_Literal (Loc,
Intval => UI_Max (Loval, Ahiv)))))));
Set_Etype (Discr, Tnn);
end if;
<<Continue>>
Next_Component (Comp);
end loop;
end Adjust_Discriminants;
------------------------------------------
-- Build_Access_Subprogram_Wrapper_Body --
------------------------------------------
procedure Build_Access_Subprogram_Wrapper_Body
(Decl : Node_Id;
New_Decl : Node_Id)
is
Loc : constant Source_Ptr := Sloc (Decl);
Actuals : constant List_Id := New_List;
Type_Def : constant Node_Id := Type_Definition (Decl);
Type_Id : constant Entity_Id := Defining_Identifier (Decl);
Spec_Node : constant Node_Id :=
Copy_Subprogram_Spec (Specification (New_Decl));
-- This copy creates new identifiers for formals and subprogram.
Act : Node_Id;
Body_Node : Node_Id;
Call_Stmt : Node_Id;
Ptr : Entity_Id;
begin
if not Expander_Active then
return;
end if;
-- Create List of actuals for indirect call. The last parameter of the
-- subprogram declaration is the access value for the indirect call.
Act := First (Parameter_Specifications (Spec_Node));
while Present (Act) loop
exit when Act = Last (Parameter_Specifications (Spec_Node));
Append_To (Actuals,
Make_Identifier (Loc, Chars (Defining_Identifier (Act))));
Next (Act);
end loop;
Ptr :=
Defining_Identifier
(Last (Parameter_Specifications (Specification (New_Decl))));
if Nkind (Type_Def) = N_Access_Procedure_Definition then
Call_Stmt := Make_Procedure_Call_Statement (Loc,
Name =>
Make_Explicit_Dereference
(Loc, New_Occurrence_Of (Ptr, Loc)),
Parameter_Associations => Actuals);
else
Call_Stmt := Make_Simple_Return_Statement (Loc,
Expression =>
Make_Function_Call (Loc,
Name => Make_Explicit_Dereference
(Loc, New_Occurrence_Of (Ptr, Loc)),
Parameter_Associations => Actuals));
end if;
Body_Node := Make_Subprogram_Body (Loc,
Specification => Spec_Node,
Declarations => New_List,
Handled_Statement_Sequence =>
Make_Handled_Sequence_Of_Statements (Loc,
Statements => New_List (Call_Stmt)));
-- Place body in list of freeze actions for the type.
Append_Freeze_Action (Type_Id, Body_Node);
end Build_Access_Subprogram_Wrapper_Body;
---------------------------
-- Build_Array_Init_Proc --
---------------------------
procedure Build_Array_Init_Proc (A_Type : Entity_Id; Nod : Node_Id) is
Comp_Type : constant Entity_Id := Component_Type (A_Type);
Comp_Simple_Init : constant Boolean :=
Needs_Simple_Initialization
(Typ => Comp_Type,
Consider_IS =>
not (Validity_Check_Copies and Is_Bit_Packed_Array (A_Type)));
-- True if the component needs simple initialization, based on its type,
-- plus the fact that we do not do simple initialization for components
-- of bit-packed arrays when validity checks are enabled, because the
-- initialization with deliberately out-of-range values would raise
-- Constraint_Error.
Body_Stmts : List_Id;
Has_Default_Init : Boolean;
Index_List : List_Id;
Loc : Source_Ptr;
Parameters : List_Id;
Proc_Id : Entity_Id;
function Init_Component return List_Id;
-- Create one statement to initialize one array component, designated
-- by a full set of indexes.
function Init_One_Dimension (N : Int) return List_Id;
-- Create loop to initialize one dimension of the array. The single
-- statement in the loop body initializes the inner dimensions if any,
-- or else the single component. Note that this procedure is called
-- recursively, with N being the dimension to be initialized. A call
-- with N greater than the number of dimensions simply generates the
-- component initialization, terminating the recursion.
--------------------
-- Init_Component --
--------------------
function Init_Component return List_Id is
Comp : Node_Id;
begin
Comp :=
Make_Indexed_Component (Loc,
Prefix => Make_Identifier (Loc, Name_uInit),
Expressions => Index_List);
if Has_Default_Aspect (A_Type) then
Set_Assignment_OK (Comp);
return New_List (
Make_Assignment_Statement (Loc,
Name => Comp,
Expression =>
Convert_To (Comp_Type,
Default_Aspect_Component_Value (First_Subtype (A_Type)))));
elsif Comp_Simple_Init then
Set_Assignment_OK (Comp);
return New_List (
Make_Assignment_Statement (Loc,
Name => Comp,
Expression =>
Get_Simple_Init_Val
(Typ => Comp_Type,
N => Nod,
Size => Component_Size (A_Type))));
else
Clean_Task_Names (Comp_Type, Proc_Id);
return
Build_Initialization_Call
(Loc => Loc,
Id_Ref => Comp,
Typ => Comp_Type,
In_Init_Proc => True,
Enclos_Type => A_Type);
end if;
end Init_Component;
------------------------
-- Init_One_Dimension --
------------------------
function Init_One_Dimension (N : Int) return List_Id is
Index : Entity_Id;
DIC_Call : Node_Id;
Result_List : List_Id;
function Possible_DIC_Call return Node_Id;
-- If the component type has Default_Initial_Conditions and a DIC
-- procedure that is not an empty body, then builds a call to the
-- DIC procedure and returns it.
-----------------------
-- Possible_DIC_Call --
-----------------------
function Possible_DIC_Call return Node_Id is
begin
-- When the component's type has a Default_Initial_Condition, then
-- create a call for the DIC check.
if Has_DIC (Comp_Type)
-- In GNATprove mode, the component DICs are checked by other
-- means. They should not be added to the record type DIC
-- procedure, so that the procedure can be used to check the
-- record type invariants or DICs if any.
and then not GNATprove_Mode
-- DIC checks for components of controlled types are done later
-- (see Exp_Ch7.Make_Deep_Array_Body).
and then not Is_Controlled (Comp_Type)
and then Present (DIC_Procedure (Comp_Type))
and then not Has_Null_Body (DIC_Procedure (Comp_Type))
then
return
Build_DIC_Call (Loc,
Make_Indexed_Component (Loc,
Prefix => Make_Identifier (Loc, Name_uInit),
Expressions => Index_List),
Comp_Type);
else
return Empty;
end if;
end Possible_DIC_Call;
-- Start of processing for Init_One_Dimension
begin
-- If the component does not need initializing, then there is nothing
-- to do here, so we return a null body. This occurs when generating
-- the dummy Init_Proc needed for Initialize_Scalars processing.
-- An exception is if component type has a Default_Initial_Condition,
-- in which case we generate a call to the type's DIC procedure.
if not Has_Non_Null_Base_Init_Proc (Comp_Type)
and then not Comp_Simple_Init
and then not Has_Task (Comp_Type)
and then not Has_Default_Aspect (A_Type)
and then (not Has_DIC (Comp_Type)
or else N > Number_Dimensions (A_Type))
then
DIC_Call := Possible_DIC_Call;
if Present (DIC_Call) then
return New_List (DIC_Call);
else
return New_List (Make_Null_Statement (Loc));
end if;
-- If all dimensions dealt with, we simply initialize the component
-- and append a call to component type's DIC procedure when needed.
elsif N > Number_Dimensions (A_Type) then
DIC_Call := Possible_DIC_Call;
if Present (DIC_Call) then
Result_List := Init_Component;
Append (DIC_Call, Result_List);
return Result_List;
else
return Init_Component;
end if;
-- Here we generate the required loop
else
Index :=
Make_Defining_Identifier (Loc, New_External_Name ('J', N));
Append (New_Occurrence_Of (Index, Loc), Index_List);
return New_List (
Make_Implicit_Loop_Statement (Nod,
Identifier => Empty,
Iteration_Scheme =>
Make_Iteration_Scheme (Loc,
Loop_Parameter_Specification =>
Make_Loop_Parameter_Specification (Loc,
Defining_Identifier => Index,
Discrete_Subtype_Definition =>
Make_Attribute_Reference (Loc,
Prefix =>
Make_Identifier (Loc, Name_uInit),
Attribute_Name => Name_Range,
Expressions => New_List (
Make_Integer_Literal (Loc, N))))),
Statements => Init_One_Dimension (N + 1)));
end if;
end Init_One_Dimension;
-- Start of processing for Build_Array_Init_Proc
begin
-- The init proc is created when analyzing the freeze node for the type,
-- but it properly belongs with the array type declaration. However, if
-- the freeze node is for a subtype of a type declared in another unit
-- it seems preferable to use the freeze node as the source location of
-- the init proc. In any case this is preferable for gcov usage, and
-- the Sloc is not otherwise used by the compiler.
if In_Open_Scopes (Scope (A_Type)) then
Loc := Sloc (A_Type);
else
Loc := Sloc (Nod);
end if;
-- Nothing to generate in the following cases:
-- 1. Initialization is suppressed for the type
-- 2. An initialization already exists for the base type
if Initialization_Suppressed (A_Type)
or else Present (Base_Init_Proc (A_Type))
then
return;
end if;
Index_List := New_List;
-- We need an initialization procedure if any of the following is true:
-- 1. The component type has an initialization procedure
-- 2. The component type needs simple initialization
-- 3. Tasks are present
-- 4. The type is marked as a public entity
-- 5. The array type has a Default_Component_Value aspect
-- 6. The array component type has a Default_Initialization_Condition
-- The reason for the public entity test is to deal properly with the
-- Initialize_Scalars pragma. This pragma can be set in the client and
-- not in the declaring package, this means the client will make a call
-- to the initialization procedure (because one of conditions 1-3 must
-- apply in this case), and we must generate a procedure (even if it is
-- null) to satisfy the call in this case.
-- Exception: do not build an array init_proc for a type whose root
-- type is Standard.String or Standard.Wide_[Wide_]String, since there
-- is no place to put the code, and in any case we handle initialization
-- of such types (in the Initialize_Scalars case, that's the only time
-- the issue arises) in a special manner anyway which does not need an
-- init_proc.
Has_Default_Init := Has_Non_Null_Base_Init_Proc (Comp_Type)
or else Comp_Simple_Init
or else Has_Task (Comp_Type)
or else Has_Default_Aspect (A_Type)
or else Has_DIC (Comp_Type);
if Has_Default_Init
or else (not Restriction_Active (No_Initialize_Scalars)
and then Is_Public (A_Type)
and then not Is_Standard_String_Type (A_Type))
then
Proc_Id :=
Make_Defining_Identifier (Loc,
Chars => Make_Init_Proc_Name (A_Type));
-- If No_Default_Initialization restriction is active, then we don't
-- want to build an init_proc, but we need to mark that an init_proc
-- would be needed if this restriction was not active (so that we can
-- detect attempts to call it), so set a dummy init_proc in place.
-- This is only done though when actual default initialization is
-- needed (and not done when only Is_Public is True), since otherwise
-- objects such as arrays of scalars could be wrongly flagged as
-- violating the restriction.
if Restriction_Active (No_Default_Initialization) then
if Has_Default_Init then
Set_Init_Proc (A_Type, Proc_Id);
end if;
return;
end if;
Body_Stmts := Init_One_Dimension (1);
Parameters := Init_Formals (A_Type, Proc_Id);
Discard_Node (
Make_Subprogram_Body (Loc,
Specification =>
Make_Procedure_Specification (Loc,
Defining_Unit_Name => Proc_Id,
Parameter_Specifications => Parameters),
Declarations => New_List,
Handled_Statement_Sequence =>
Make_Handled_Sequence_Of_Statements (Loc,
Statements => Body_Stmts)));
Mutate_Ekind (Proc_Id, E_Procedure);
Set_Is_Public (Proc_Id, Is_Public (A_Type));
Set_Is_Internal (Proc_Id);
Set_Has_Completion (Proc_Id);
if not Debug_Generated_Code then
Set_Debug_Info_Off (Proc_Id);
end if;
-- Set Inlined on Init_Proc if it is set on the Init_Proc of the
-- component type itself (see also Build_Record_Init_Proc).
Set_Is_Inlined (Proc_Id, Inline_Init_Proc (Comp_Type));
-- Associate Init_Proc with type, and determine if the procedure
-- is null (happens because of the Initialize_Scalars pragma case,
-- where we have to generate a null procedure in case it is called
-- by a client with Initialize_Scalars set). Such procedures have
-- to be generated, but do not have to be called, so we mark them
-- as null to suppress the call. Kill also warnings for the _Init
-- out parameter, which is left entirely uninitialized.
Set_Init_Proc (A_Type, Proc_Id);
if Is_Null_Statement_List (Body_Stmts) then
Set_Is_Null_Init_Proc (Proc_Id);
Set_Warnings_Off (Defining_Identifier (First (Parameters)));
else
-- Try to build a static aggregate to statically initialize
-- objects of the type. This can only be done for constrained
-- one-dimensional arrays with static bounds.
Set_Static_Initialization
(Proc_Id,
Build_Equivalent_Array_Aggregate (First_Subtype (A_Type)));
end if;
end if;
end Build_Array_Init_Proc;
--------------------------------
-- Build_Discr_Checking_Funcs --
--------------------------------
procedure Build_Discr_Checking_Funcs (N : Node_Id) is
Rec_Id : Entity_Id;
Loc : Source_Ptr;
Enclosing_Func_Id : Entity_Id;
Sequence : Nat := 1;
Type_Def : Node_Id;
V : Node_Id;
function Build_Case_Statement
(Case_Id : Entity_Id;
Variant : Node_Id) return Node_Id;
-- Build a case statement containing only two alternatives. The first
-- alternative corresponds to the discrete choices given on the variant
-- that contains the components that we are generating the checks
-- for. If the discriminant is one of these return False. The second
-- alternative is an OTHERS choice that returns True indicating the
-- discriminant did not match.
function Build_Dcheck_Function
(Case_Id : Entity_Id;
Variant : Node_Id) return Entity_Id;
-- Build the discriminant checking function for a given variant
procedure Build_Dcheck_Functions (Variant_Part_Node : Node_Id);
-- Builds the discriminant checking function for each variant of the
-- given variant part of the record type.
--------------------------
-- Build_Case_Statement --
--------------------------
function Build_Case_Statement
(Case_Id : Entity_Id;
Variant : Node_Id) return Node_Id
is
Alt_List : constant List_Id := New_List;
Actuals_List : List_Id;
Case_Node : Node_Id;
Case_Alt_Node : Node_Id;
Choice : Node_Id;
Choice_List : List_Id;
D : Entity_Id;
Return_Node : Node_Id;
begin
Case_Node := New_Node (N_Case_Statement, Loc);
Set_End_Span (Case_Node, Uint_0);
-- Replace the discriminant which controls the variant with the name
-- of the formal of the checking function.
Set_Expression (Case_Node, Make_Identifier (Loc, Chars (Case_Id)));
Choice := First (Discrete_Choices (Variant));
if Nkind (Choice) = N_Others_Choice then
Choice_List := New_Copy_List (Others_Discrete_Choices (Choice));
else
Choice_List := New_Copy_List (Discrete_Choices (Variant));
end if;
if not Is_Empty_List (Choice_List) then
Case_Alt_Node := New_Node (N_Case_Statement_Alternative, Loc);
Set_Discrete_Choices (Case_Alt_Node, Choice_List);
-- In case this is a nested variant, we need to return the result
-- of the discriminant checking function for the immediately
-- enclosing variant.
if Present (Enclosing_Func_Id) then
Actuals_List := New_List;
D := First_Discriminant (Rec_Id);
while Present (D) loop
Append (Make_Identifier (Loc, Chars (D)), Actuals_List);
Next_Discriminant (D);
end loop;
Return_Node :=
Make_Simple_Return_Statement (Loc,
Expression =>
Make_Function_Call (Loc,
Name =>
New_Occurrence_Of (Enclosing_Func_Id, Loc),
Parameter_Associations =>
Actuals_List));
else
Return_Node :=
Make_Simple_Return_Statement (Loc,
Expression =>
New_Occurrence_Of (Standard_False, Loc));
end if;
Set_Statements (Case_Alt_Node, New_List (Return_Node));
Append (Case_Alt_Node, Alt_List);
end if;
Case_Alt_Node := New_Node (N_Case_Statement_Alternative, Loc);
Choice_List := New_List (New_Node (N_Others_Choice, Loc));
Set_Discrete_Choices (Case_Alt_Node, Choice_List);
Return_Node :=
Make_Simple_Return_Statement (Loc,
Expression =>
New_Occurrence_Of (Standard_True, Loc));
Set_Statements (Case_Alt_Node, New_List (Return_Node));
Append (Case_Alt_Node, Alt_List);
Set_Alternatives (Case_Node, Alt_List);
return Case_Node;
end Build_Case_Statement;
---------------------------
-- Build_Dcheck_Function --
---------------------------
function Build_Dcheck_Function
(Case_Id : Entity_Id;
Variant : Node_Id) return Entity_Id
is
Body_Node : Node_Id;
Func_Id : Entity_Id;
Parameter_List : List_Id;
Spec_Node : Node_Id;
begin
Body_Node := New_Node (N_Subprogram_Body, Loc);
Sequence := Sequence + 1;
Func_Id :=
Make_Defining_Identifier (Loc,
Chars => New_External_Name (Chars (Rec_Id), 'D', Sequence));
Set_Is_Discriminant_Check_Function (Func_Id);
Spec_Node := New_Node (N_Function_Specification, Loc);
Set_Defining_Unit_Name (Spec_Node, Func_Id);
Parameter_List := Build_Discriminant_Formals (Rec_Id, False);
Set_Parameter_Specifications (Spec_Node, Parameter_List);
Set_Result_Definition (Spec_Node,
New_Occurrence_Of (Standard_Boolean, Loc));
Set_Specification (Body_Node, Spec_Node);
Set_Declarations (Body_Node, New_List);
Set_Handled_Statement_Sequence (Body_Node,
Make_Handled_Sequence_Of_Statements (Loc,
Statements => New_List (
Build_Case_Statement (Case_Id, Variant))));
Mutate_Ekind (Func_Id, E_Function);
Set_Mechanism (Func_Id, Default_Mechanism);
Set_Is_Inlined (Func_Id, True);
Set_Is_Pure (Func_Id, True);
Set_Is_Public (Func_Id, Is_Public (Rec_Id));
Set_Is_Internal (Func_Id, True);
if not Debug_Generated_Code then
Set_Debug_Info_Off (Func_Id);
end if;
Analyze (Body_Node);
Append_Freeze_Action (Rec_Id, Body_Node);
Set_Dcheck_Function (Variant, Func_Id);
return Func_Id;
end Build_Dcheck_Function;
----------------------------
-- Build_Dcheck_Functions --
----------------------------
procedure Build_Dcheck_Functions (Variant_Part_Node : Node_Id) is
Component_List_Node : Node_Id;
Decl : Entity_Id;
Discr_Name : Entity_Id;
Func_Id : Entity_Id;
Variant : Node_Id;
Saved_Enclosing_Func_Id : Entity_Id;
begin
-- Build the discriminant-checking function for each variant, and
-- label all components of that variant with the function's name.
-- We only Generate a discriminant-checking function when the
-- variant is not empty, to prevent the creation of dead code.
Discr_Name := Entity (Name (Variant_Part_Node));
Variant := First_Non_Pragma (Variants (Variant_Part_Node));
while Present (Variant) loop
Component_List_Node := Component_List (Variant);
if not Null_Present (Component_List_Node) then
Func_Id := Build_Dcheck_Function (Discr_Name, Variant);
Decl :=
First_Non_Pragma (Component_Items (Component_List_Node));
while Present (Decl) loop
Set_Discriminant_Checking_Func
(Defining_Identifier (Decl), Func_Id);
Next_Non_Pragma (Decl);
end loop;
if Present (Variant_Part (Component_List_Node)) then
Saved_Enclosing_Func_Id := Enclosing_Func_Id;
Enclosing_Func_Id := Func_Id;
Build_Dcheck_Functions (Variant_Part (Component_List_Node));
Enclosing_Func_Id := Saved_Enclosing_Func_Id;
end if;
end if;
Next_Non_Pragma (Variant);
end loop;
end Build_Dcheck_Functions;
-- Start of processing for Build_Discr_Checking_Funcs
begin
-- Only build if not done already
if not Discr_Check_Funcs_Built (N) then
Type_Def := Type_Definition (N);
if Nkind (Type_Def) = N_Record_Definition then
if No (Component_List (Type_Def)) then -- null record.
return;
else
V := Variant_Part (Component_List (Type_Def));
end if;
else pragma Assert (Nkind (Type_Def) = N_Derived_Type_Definition);
if No (Component_List (Record_Extension_Part (Type_Def))) then
return;
else
V := Variant_Part
(Component_List (Record_Extension_Part (Type_Def)));
end if;
end if;
Rec_Id := Defining_Identifier (N);
if Present (V) and then not Is_Unchecked_Union (Rec_Id) then
Loc := Sloc (N);
Enclosing_Func_Id := Empty;
Build_Dcheck_Functions (V);
end if;
Set_Discr_Check_Funcs_Built (N);
end if;
end Build_Discr_Checking_Funcs;
----------------------------------------
-- Build_Or_Copy_Discr_Checking_Funcs --
----------------------------------------
procedure Build_Or_Copy_Discr_Checking_Funcs (N : Node_Id) is
Typ : constant Entity_Id := Defining_Identifier (N);
begin
if Is_Unchecked_Union (Typ) or else not Has_Discriminants (Typ) then
null;
elsif not Is_Derived_Type (Typ)
or else Has_New_Non_Standard_Rep (Typ)
or else Is_Tagged_Type (Typ)
then
Build_Discr_Checking_Funcs (N);
else
Copy_Discr_Checking_Funcs (N);
end if;
end Build_Or_Copy_Discr_Checking_Funcs;
--------------------------------
-- Build_Discriminant_Formals --
--------------------------------
function Build_Discriminant_Formals
(Rec_Id : Entity_Id;
Use_Dl : Boolean) return List_Id
is
Loc : Source_Ptr := Sloc (Rec_Id);
Parameter_List : constant List_Id := New_List;
D : Entity_Id;
Formal : Entity_Id;
Formal_Type : Entity_Id;
Param_Spec_Node : Node_Id;
begin
if Has_Discriminants (Rec_Id) then
D := First_Discriminant (Rec_Id);
while Present (D) loop
Loc := Sloc (D);
if Use_Dl then
Formal := Discriminal (D);
Formal_Type := Etype (Formal);
else
Formal := Make_Defining_Identifier (Loc, Chars (D));
Formal_Type := Etype (D);
end if;
Param_Spec_Node :=
Make_Parameter_Specification (Loc,
Defining_Identifier => Formal,
Parameter_Type =>
New_Occurrence_Of (Formal_Type, Loc));
Append (Param_Spec_Node, Parameter_List);
Next_Discriminant (D);
end loop;
end if;
return Parameter_List;
end Build_Discriminant_Formals;
--------------------------------------
-- Build_Equivalent_Array_Aggregate --
--------------------------------------
function Build_Equivalent_Array_Aggregate (T : Entity_Id) return Node_Id is
Loc : constant Source_Ptr := Sloc (T);
Comp_Type : constant Entity_Id := Component_Type (T);
Index_Type : constant Entity_Id := Etype (First_Index (T));
Proc : constant Entity_Id := Base_Init_Proc (T);
Lo, Hi : Node_Id;
Aggr : Node_Id;
Expr : Node_Id;
begin
if not Is_Constrained (T)
or else Number_Dimensions (T) > 1
or else No (Proc)
then
Initialization_Warning (T);
return Empty;
end if;
Lo := Type_Low_Bound (Index_Type);
Hi := Type_High_Bound (Index_Type);
if not Compile_Time_Known_Value (Lo)
or else not Compile_Time_Known_Value (Hi)
then
Initialization_Warning (T);
return Empty;
end if;
if Is_Record_Type (Comp_Type)
and then Present (Base_Init_Proc (Comp_Type))
then
Expr := Static_Initialization (Base_Init_Proc (Comp_Type));
if No (Expr) then
Initialization_Warning (T);
return Empty;
end if;
else
Initialization_Warning (T);
return Empty;
end if;
Aggr := Make_Aggregate (Loc, No_List, New_List);
Set_Etype (Aggr, T);
Set_Aggregate_Bounds (Aggr,
Make_Range (Loc,
Low_Bound => New_Copy (Lo),
High_Bound => New_Copy (Hi)));
Set_Parent (Aggr, Parent (Proc));
Append_To (Component_Associations (Aggr),
Make_Component_Association (Loc,
Choices =>
New_List (
Make_Range (Loc,
Low_Bound => New_Copy (Lo),
High_Bound => New_Copy (Hi))),
Expression => Expr));
if Static_Array_Aggregate (Aggr) then
return Aggr;
else
Initialization_Warning (T);
return Empty;
end if;
end Build_Equivalent_Array_Aggregate;
---------------------------------------
-- Build_Equivalent_Record_Aggregate --
---------------------------------------
function Build_Equivalent_Record_Aggregate (T : Entity_Id) return Node_Id is
Agg : Node_Id;
Comp : Entity_Id;
Comp_Type : Entity_Id;
begin
if not Is_Record_Type (T)
or else Has_Discriminants (T)
or else Is_Limited_Type (T)
or else Has_Non_Standard_Rep (T)
then
Initialization_Warning (T);
return Empty;
end if;
Comp := First_Component (T);
-- A null record needs no warning
if No (Comp) then
return Empty;
end if;
while Present (Comp) loop
-- Array components are acceptable if initialized by a positional
-- aggregate with static components.
if Is_Array_Type (Etype (Comp)) then
Comp_Type := Component_Type (Etype (Comp));
if Nkind (Parent (Comp)) /= N_Component_Declaration
or else No (Expression (Parent (Comp)))
or else Nkind (Expression (Parent (Comp))) /= N_Aggregate
then
Initialization_Warning (T);
return Empty;
elsif Is_Scalar_Type (Component_Type (Etype (Comp)))
and then
(not Compile_Time_Known_Value (Type_Low_Bound (Comp_Type))
or else
not Compile_Time_Known_Value (Type_High_Bound (Comp_Type)))
then
Initialization_Warning (T);
return Empty;
elsif
not Static_Array_Aggregate (Expression (Parent (Comp)))
then
Initialization_Warning (T);
return Empty;
-- We need to return empty if the type has predicates because
-- this would otherwise duplicate calls to the predicate
-- function. If the type hasn't been frozen before being
-- referenced in the current record, the extraneous call to
-- the predicate function would be inserted somewhere before
-- the predicate function is elaborated, which would result in
-- an invalid tree.
elsif Has_Predicates (Etype (Comp)) then
return Empty;
end if;
elsif Is_Scalar_Type (Etype (Comp)) then
Comp_Type := Etype (Comp);
if Nkind (Parent (Comp)) /= N_Component_Declaration
or else No (Expression (Parent (Comp)))
or else not Compile_Time_Known_Value (Expression (Parent (Comp)))
or else not Compile_Time_Known_Value (Type_Low_Bound (Comp_Type))
or else not
Compile_Time_Known_Value (Type_High_Bound (Comp_Type))
then
Initialization_Warning (T);
return Empty;
end if;
-- For now, other types are excluded
else
Initialization_Warning (T);
return Empty;
end if;
Next_Component (Comp);
end loop;
-- All components have static initialization. Build positional aggregate
-- from the given expressions or defaults.
Agg := Make_Aggregate (Sloc (T), New_List, New_List);
Set_Parent (Agg, Parent (T));
Comp := First_Component (T);
while Present (Comp) loop
Append
(New_Copy_Tree (Expression (Parent (Comp))), Expressions (Agg));
Next_Component (Comp);
end loop;
Analyze_And_Resolve (Agg, T);
return Agg;
end Build_Equivalent_Record_Aggregate;
----------------------------
-- Init_Proc_Level_Formal --
----------------------------
function Init_Proc_Level_Formal (Proc : Entity_Id) return Entity_Id is
Form : Entity_Id;
begin
-- Move through the formals of the initialization procedure Proc to find
-- the extra accessibility level parameter associated with the object
-- being initialized.
Form := First_Formal (Proc);
while Present (Form) loop
if Chars (Form) = Name_uInit_Level then
return Form;
end if;
Next_Formal (Form);
end loop;
-- No formal was found, return Empty
return Empty;
end Init_Proc_Level_Formal;
-------------------------------
-- Build_Initialization_Call --
-------------------------------
-- References to a discriminant inside the record type declaration can
-- appear either in the subtype_indication to constrain a record or an
-- array, or as part of a larger expression given for the initial value
-- of a component. In both of these cases N appears in the record
-- initialization procedure and needs to be replaced by the formal
-- parameter of the initialization procedure which corresponds to that
-- discriminant.
-- In the example below, references to discriminants D1 and D2 in proc_1
-- are replaced by references to formals with the same name
-- (discriminals)
-- A similar replacement is done for calls to any record initialization
-- procedure for any components that are themselves of a record type.
-- type R (D1, D2 : Integer) is record
-- X : Integer := F * D1;
-- Y : Integer := F * D2;
-- end record;
-- procedure proc_1 (Out_2 : out R; D1 : Integer; D2 : Integer) is
-- begin
-- Out_2.D1 := D1;
-- Out_2.D2 := D2;
-- Out_2.X := F * D1;
-- Out_2.Y := F * D2;
-- end;
function Build_Initialization_Call
(Loc : Source_Ptr;
Id_Ref : Node_Id;
Typ : Entity_Id;
In_Init_Proc : Boolean := False;
Enclos_Type : Entity_Id := Empty;
Discr_Map : Elist_Id := New_Elmt_List;
With_Default_Init : Boolean := False;
Constructor_Ref : Node_Id := Empty;
Init_Control_Actual : Entity_Id := Empty) return List_Id
is
Res : constant List_Id := New_List;
Full_Type : Entity_Id;
procedure Check_Predicated_Discriminant
(Val : Node_Id;
Discr : Entity_Id);
-- Discriminants whose subtypes have predicates are checked in two
-- cases:
-- a) When an object is default-initialized and assertions are enabled
-- we check that the value of the discriminant obeys the predicate.
-- b) In all cases, if the discriminant controls a variant and the
-- variant has no others_choice, Constraint_Error must be raised if
-- the predicate is violated, because there is no variant covered
-- by the illegal discriminant value.
-----------------------------------
-- Check_Predicated_Discriminant --
-----------------------------------
procedure Check_Predicated_Discriminant
(Val : Node_Id;
Discr : Entity_Id)
is
Typ : constant Entity_Id := Etype (Discr);
procedure Check_Missing_Others (V : Node_Id);
-- Check that a given variant and its nested variants have an others
-- choice, and generate a constraint error raise when it does not.
--------------------------
-- Check_Missing_Others --
--------------------------
procedure Check_Missing_Others (V : Node_Id) is
Alt : Node_Id;
Choice : Node_Id;
Last_Var : Node_Id;
begin
Last_Var := Last_Non_Pragma (Variants (V));
Choice := First (Discrete_Choices (Last_Var));
-- An others_choice is added during expansion for gcc use, but
-- does not cover the illegality.
if Entity (Name (V)) = Discr then
if Present (Choice)
and then (Nkind (Choice) /= N_Others_Choice
or else not Comes_From_Source (Choice))
then
Check_Expression_Against_Static_Predicate (Val, Typ);
if not Is_Static_Expression (Val) then
Prepend_To (Res,
Make_Raise_Constraint_Error (Loc,
Condition =>
Make_Op_Not (Loc,
Right_Opnd => Make_Predicate_Call (Typ, Val)),
Reason => CE_Invalid_Data));
end if;
end if;
end if;
-- Check whether some nested variant is ruled by the predicated
-- discriminant.
Alt := First (Variants (V));
while Present (Alt) loop
if Nkind (Alt) = N_Variant
and then Present (Variant_Part (Component_List (Alt)))
then
Check_Missing_Others
(Variant_Part (Component_List (Alt)));
end if;
Next (Alt);
end loop;
end Check_Missing_Others;
-- Local variables
Def : Node_Id;
-- Start of processing for Check_Predicated_Discriminant
begin
if Ekind (Base_Type (Full_Type)) = E_Record_Type then
Def := Type_Definition (Parent (Base_Type (Full_Type)));
else
return;
end if;
if Policy_In_Effect (Name_Assert) = Name_Check
and then not Predicates_Ignored (Etype (Discr))
then
Prepend_To (Res, Make_Predicate_Check (Typ, Val));
end if;
-- If discriminant controls a variant, verify that predicate is
-- obeyed or else an Others_Choice is present.
if Nkind (Def) = N_Record_Definition
and then Present (Variant_Part (Component_List (Def)))
and then Policy_In_Effect (Name_Assert) = Name_Ignore
then
Check_Missing_Others (Variant_Part (Component_List (Def)));
end if;
end Check_Predicated_Discriminant;
-- Local variables
Arg : Node_Id;
Args : List_Id;
Decls : List_Id;
Decl : Node_Id;
Discr : Entity_Id;
First_Arg : Node_Id;
Full_Init_Type : Entity_Id;
Init_Call : Node_Id;
Init_Type : Entity_Id;
Proc : Entity_Id;
-- Start of processing for Build_Initialization_Call
begin
pragma Assert (Constructor_Ref = Empty
or else Is_CPP_Constructor_Call (Constructor_Ref));
if No (Constructor_Ref) then
Proc := Base_Init_Proc (Typ);
else
Proc := Base_Init_Proc (Typ, Entity (Name (Constructor_Ref)));
end if;
pragma Assert (Present (Proc));
Init_Type := Etype (First_Formal (Proc));
Full_Init_Type := Underlying_Type (Init_Type);
-- Nothing to do if the Init_Proc is null, unless Initialize_Scalars
-- is active (in which case we make the call anyway, since in the
-- actual compiled client it may be non null).
if Is_Null_Init_Proc (Proc) and then not Init_Or_Norm_Scalars then
return Empty_List;
-- Nothing to do for an array of controlled components that have only
-- the inherited Initialize primitive. This is a useful optimization
-- for CodePeer.
elsif Is_Trivial_Subprogram (Proc)
and then Is_Array_Type (Full_Init_Type)
then
return New_List (Make_Null_Statement (Loc));
end if;
-- Use the [underlying] full view when dealing with a private type. This
-- may require several steps depending on derivations.
Full_Type := Typ;
loop
if Is_Private_Type (Full_Type) then
if Present (Full_View (Full_Type)) then
Full_Type := Full_View (Full_Type);
elsif Present (Underlying_Full_View (Full_Type)) then
Full_Type := Underlying_Full_View (Full_Type);
-- When a private type acts as a generic actual and lacks a full
-- view, use the base type.
elsif Is_Generic_Actual_Type (Full_Type) then
Full_Type := Base_Type (Full_Type);
elsif Ekind (Full_Type) = E_Private_Subtype
and then (not Has_Discriminants (Full_Type)
or else No (Discriminant_Constraint (Full_Type)))
then
Full_Type := Etype (Full_Type);
-- The loop has recovered the [underlying] full view, stop the
-- traversal.
else
exit;
end if;
-- The type is not private, nothing to do
else
exit;
end if;
end loop;
-- If Typ is derived, the procedure is the initialization procedure for
-- the root type. Wrap the argument in an conversion to make it type
-- honest. Actually it isn't quite type honest, because there can be
-- conflicts of views in the private type case. That is why we set
-- Conversion_OK in the conversion node.
if (Is_Record_Type (Typ)
or else Is_Array_Type (Typ)
or else Is_Private_Type (Typ))
and then Init_Type /= Base_Type (Typ)
then
First_Arg := OK_Convert_To (Etype (Init_Type), Id_Ref);
Set_Etype (First_Arg, Init_Type);
else
First_Arg := Id_Ref;
end if;
Args := New_List (Convert_Concurrent (First_Arg, Typ));
-- In the tasks case, add _Master as the value of the _Master parameter
-- and _Chain as the value of the _Chain parameter. At the outer level,
-- these will be variables holding the corresponding values obtained
-- from GNARL. At inner levels, they will be the parameters passed down
-- through the outer routines.
if Has_Task (Full_Type) then
if Restriction_Active (No_Task_Hierarchy) then
Append_To (Args, Make_Integer_Literal (Loc, Library_Task_Level));
else
Append_To (Args, Make_Identifier (Loc, Name_uMaster));
end if;
-- Add _Chain (not done for sequential elaboration policy, see
-- comment for Create_Restricted_Task_Sequential in s-tarest.ads).
if Partition_Elaboration_Policy /= 'S' then
Append_To (Args, Make_Identifier (Loc, Name_uChain));
end if;
-- Ada 2005 (AI-287): In case of default initialized components
-- with tasks, we generate a null string actual parameter.
-- This is just a workaround that must be improved later???
if With_Default_Init then
Append_To (Args,
Make_String_Literal (Loc,
Strval => ""));
else
Decls :=
Build_Task_Image_Decls (Loc, Id_Ref, Enclos_Type, In_Init_Proc);
Decl := Last (Decls);
Append_To (Args,
New_Occurrence_Of (Defining_Identifier (Decl), Loc));
Append_List (Decls, Res);
end if;
else
Decls := No_List;
Decl := Empty;
end if;
-- Handle the optionally generated formal *_skip_null_excluding_checks
-- Look at the associated node for the object we are referencing and
-- verify that we are expanding a call to an Init_Proc for an internally
-- generated object declaration before passing True and skipping the
-- relevant checks.
if Needs_Conditional_Null_Excluding_Check (Full_Init_Type)
and then Nkind (Id_Ref) in N_Has_Entity
and then (Comes_From_Source (Id_Ref)
or else (Present (Associated_Node (Id_Ref))
and then Comes_From_Source
(Associated_Node (Id_Ref))))
then
Append_To (Args, New_Occurrence_Of (Standard_True, Loc));
end if;
-- Add discriminant values if discriminants are present
if Has_Discriminants (Full_Init_Type) then
Discr := First_Discriminant (Full_Init_Type);
while Present (Discr) loop
-- If this is a discriminated concurrent type, the init_proc
-- for the corresponding record is being called. Use that type
-- directly to find the discriminant value, to handle properly
-- intervening renamed discriminants.
declare
T : Entity_Id := Full_Type;
begin
if Is_Protected_Type (T) then
T := Corresponding_Record_Type (T);
end if;
Arg :=
Get_Discriminant_Value (
Discr,
T,
Discriminant_Constraint (Full_Type));
end;
-- If the target has access discriminants, and is constrained by
-- an access to the enclosing construct, i.e. a current instance,
-- replace the reference to the type by a reference to the object.
if Nkind (Arg) = N_Attribute_Reference
and then Is_Access_Type (Etype (Arg))
and then Is_Entity_Name (Prefix (Arg))
and then Is_Type (Entity (Prefix (Arg)))
then
Arg :=
Make_Attribute_Reference (Loc,
Prefix => New_Copy (Prefix (Id_Ref)),
Attribute_Name => Name_Unrestricted_Access);
elsif In_Init_Proc then
-- Replace any possible references to the discriminant in the
-- call to the record initialization procedure with references
-- to the appropriate formal parameter.
if Nkind (Arg) = N_Identifier
and then Ekind (Entity (Arg)) = E_Discriminant
then
Arg := New_Occurrence_Of (Discriminal (Entity (Arg)), Loc);
-- Otherwise make a copy of the default expression. Note that
-- we use the current Sloc for this, because we do not want the
-- call to appear to be at the declaration point. Within the
-- expression, replace discriminants with their discriminals.
else
Arg :=
New_Copy_Tree (Arg, Map => Discr_Map, New_Sloc => Loc);
end if;
else
if Is_Constrained (Full_Type) then
Arg := Duplicate_Subexpr_No_Checks (Arg);
else
-- The constraints come from the discriminant default exps,
-- they must be reevaluated, so we use New_Copy_Tree but we
-- ensure the proper Sloc (for any embedded calls).
-- In addition, if a predicate check is needed on the value
-- of the discriminant, insert it ahead of the call.
Arg := New_Copy_Tree (Arg, New_Sloc => Loc);
end if;
if Has_Predicates (Etype (Discr)) then
Check_Predicated_Discriminant (Arg, Discr);
end if;
end if;
-- Ada 2005 (AI-287): In case of default initialized components,
-- if the component is constrained with a discriminant of the
-- enclosing type, we need to generate the corresponding selected
-- component node to access the discriminant value. In other cases
-- this is not required, either because we are inside the init
-- proc and we use the corresponding formal, or else because the
-- component is constrained by an expression.
if With_Default_Init
and then Nkind (Id_Ref) = N_Selected_Component
and then Nkind (Arg) = N_Identifier
and then Ekind (Entity (Arg)) = E_Discriminant
then
Append_To (Args,
Make_Selected_Component (Loc,
Prefix => New_Copy_Tree (Prefix (Id_Ref)),
Selector_Name => Arg));
else
Append_To (Args, Arg);
end if;
Next_Discriminant (Discr);
end loop;
end if;
-- If this is a call to initialize the parent component of a derived
-- tagged type, indicate that the tag should not be set in the parent.
-- This is done via the actual parameter value for the Init_Control
-- formal parameter, which is also used to deal with late initialization
-- requirements.
--
-- We pass in Full_Init_Except_Tag unless the caller tells us to do
-- otherwise (by passing in a nonempty Init_Control_Actual parameter).
if Is_Tagged_Type (Full_Init_Type)
and then not Is_CPP_Class (Full_Init_Type)
and then Nkind (Id_Ref) = N_Selected_Component
and then Chars (Selector_Name (Id_Ref)) = Name_uParent
then
declare
use Initialization_Control;
begin
Append_To (Args,
(if Present (Init_Control_Actual)
then Init_Control_Actual
else Make_Mode_Literal (Loc, Full_Init_Except_Tag)));
end;
elsif Present (Constructor_Ref) then
Append_List_To (Args,
New_Copy_List (Parameter_Associations (Constructor_Ref)));
end if;
-- Pass the extra accessibility level parameter associated with the
-- level of the object being initialized when required.
if Is_Entity_Name (Id_Ref)
and then Present (Init_Proc_Level_Formal (Proc))
then
Append_To (Args,
Make_Parameter_Association (Loc,
Selector_Name =>
Make_Identifier (Loc, Name_uInit_Level),
Explicit_Actual_Parameter =>
Accessibility_Level (Id_Ref, Dynamic_Level)));
end if;
Append_To (Res,
Make_Procedure_Call_Statement (Loc,
Name => New_Occurrence_Of (Proc, Loc),
Parameter_Associations => Args));
if Needs_Finalization (Typ)
and then Nkind (Id_Ref) = N_Selected_Component
then
if Chars (Selector_Name (Id_Ref)) /= Name_uParent then
Init_Call :=
Make_Init_Call
(Obj_Ref => New_Copy_Tree (First_Arg),
Typ => Typ);
-- Guard against a missing [Deep_]Initialize when the type was not
-- properly frozen.
if Present (Init_Call) then
Append_To (Res, Init_Call);
end if;
end if;
end if;
return Res;
exception
when RE_Not_Available =>
return Empty_List;
end Build_Initialization_Call;
----------------------------
-- Build_Record_Init_Proc --
----------------------------
procedure Build_Record_Init_Proc (N : Node_Id; Rec_Ent : Entity_Id) is
Decls : constant List_Id := New_List;
Discr_Map : constant Elist_Id := New_Elmt_List;
Loc : constant Source_Ptr := Sloc (Rec_Ent);
Counter : Nat := 0;
Proc_Id : Entity_Id;
Rec_Type : Entity_Id;
Init_Control_Formal : Entity_Id := Empty; -- set in Build_Init_Statements
Has_Late_Init_Comp : Boolean := False; -- set in Build_Init_Statements
function Build_Assignment
(Id : Entity_Id;
Default : Node_Id) return List_Id;
-- Build an assignment statement that assigns the default expression to
-- its corresponding record component if defined. The left-hand side of
-- the assignment is marked Assignment_OK so that initialization of
-- limited private records works correctly. This routine may also build
-- an adjustment call if the component is controlled.
procedure Build_Discriminant_Assignments (Statement_List : List_Id);
-- If the record has discriminants, add assignment statements to
-- Statement_List to initialize the discriminant values from the
-- arguments of the initialization procedure.
function Build_Init_Statements (Comp_List : Node_Id) return List_Id;
-- Build a list representing a sequence of statements which initialize
-- components of the given component list. This may involve building
-- case statements for the variant parts. Append any locally declared
-- objects on list Decls.
function Build_Init_Call_Thru (Parameters : List_Id) return List_Id;
-- Given an untagged type-derivation that declares discriminants, e.g.
--
-- type R (R1, R2 : Integer) is record ... end record;
-- type D (D1 : Integer) is new R (1, D1);
--
-- we make the _init_proc of D be
--
-- procedure _init_proc (X : D; D1 : Integer) is
-- begin
-- _init_proc (R (X), 1, D1);
-- end _init_proc;
--
-- This function builds the call statement in this _init_proc.
procedure Build_CPP_Init_Procedure;
-- Build the tree corresponding to the procedure specification and body
-- of the IC procedure that initializes the C++ part of the dispatch
-- table of an Ada tagged type that is a derivation of a CPP type.
-- Install it as the CPP_Init TSS.
procedure Build_Init_Procedure;
-- Build the tree corresponding to the procedure specification and body
-- of the initialization procedure and install it as the _init TSS.
procedure Build_Offset_To_Top_Functions;
-- Ada 2005 (AI-251): Build the tree corresponding to the procedure spec
-- and body of Offset_To_Top, a function used in conjuction with types
-- having secondary dispatch tables.
procedure Build_Record_Checks (S : Node_Id; Check_List : List_Id);
-- Add range checks to components of discriminated records. S is a
-- subtype indication of a record component. Check_List is a list
-- to which the check actions are appended.
function Component_Needs_Simple_Initialization
(T : Entity_Id) return Boolean;
-- Determine if a component needs simple initialization, given its type
-- T. This routine is the same as Needs_Simple_Initialization except for
-- components of type Tag and Interface_Tag. These two access types do
-- not require initialization since they are explicitly initialized by
-- other means.
function Parent_Subtype_Renaming_Discrims return Boolean;
-- Returns True for base types N that rename discriminants, else False
function Requires_Init_Proc (Rec_Id : Entity_Id) return Boolean;
-- Determine whether a record initialization procedure needs to be
-- generated for the given record type.
----------------------
-- Build_Assignment --
----------------------
function Build_Assignment
(Id : Entity_Id;
Default : Node_Id) return List_Id
is
Default_Loc : constant Source_Ptr := Sloc (Default);
Typ : constant Entity_Id := Underlying_Type (Etype (Id));
Adj_Call : Node_Id;
Exp : Node_Id := Default;
Kind : Node_Kind := Nkind (Default);
Lhs : Node_Id;
Res : List_Id;
begin
Lhs :=
Make_Selected_Component (Default_Loc,
Prefix => Make_Identifier (Loc, Name_uInit),
Selector_Name => New_Occurrence_Of (Id, Default_Loc));
Set_Assignment_OK (Lhs);
-- Take a copy of Exp to ensure that later copies of this component
-- declaration in derived types see the original tree, not a node
-- rewritten during expansion of the init_proc. If the copy contains
-- itypes, the scope of the new itypes is the init_proc being built.
declare
Map : Elist_Id := No_Elist;
begin
if Has_Late_Init_Comp then
-- Map the type to the _Init parameter in order to
-- handle "current instance" references.
Map := New_Elmt_List
(Elmt1 => Rec_Type,
Elmt2 => Defining_Identifier (First
(Parameter_Specifications
(Parent (Proc_Id)))));
-- If the type has an incomplete view, a current instance
-- may have an incomplete type. In that case, it must also be
-- replaced by the formal of the Init_Proc.
if Nkind (Parent (Rec_Type)) = N_Full_Type_Declaration
and then Present (Incomplete_View (Parent (Rec_Type)))
then
Append_Elmt (
N => Incomplete_View (Parent (Rec_Type)),
To => Map);
Append_Elmt (
N => Defining_Identifier
(First
(Parameter_Specifications
(Parent (Proc_Id)))),
To => Map);
end if;
end if;
Exp := New_Copy_Tree (Exp, New_Scope => Proc_Id, Map => Map);
end;
Res := New_List (
Make_Assignment_Statement (Loc,
Name => Lhs,
Expression => Exp));
Set_No_Ctrl_Actions (First (Res));
-- Adjust the tag if tagged (because of possible view conversions).
-- Suppress the tag adjustment when not Tagged_Type_Expansion because
-- tags are represented implicitly in objects, and when the record is
-- initialized with a raise expression.
if Is_Tagged_Type (Typ)
and then Tagged_Type_Expansion
and then Nkind (Exp) /= N_Raise_Expression
and then (Nkind (Exp) /= N_Qualified_Expression
or else Nkind (Expression (Exp)) /= N_Raise_Expression)
then
Append_To (Res,
Make_Assignment_Statement (Default_Loc,
Name =>
Make_Selected_Component (Default_Loc,
Prefix =>
New_Copy_Tree (Lhs, New_Scope => Proc_Id),
Selector_Name =>
New_Occurrence_Of
(First_Tag_Component (Typ), Default_Loc)),
Expression =>
Unchecked_Convert_To (RTE (RE_Tag),
New_Occurrence_Of
(Node (First_Elmt (Access_Disp_Table (Underlying_Type
(Typ)))),
Default_Loc))));
end if;
-- Adjust the component if controlled except if it is an aggregate
-- that will be expanded inline.
if Kind = N_Qualified_Expression then
Kind := Nkind (Expression (Default));
end if;
if Needs_Finalization (Typ)
and then Kind not in N_Aggregate | N_Extension_Aggregate
and then not Is_Build_In_Place_Function_Call (Exp)
then
Adj_Call :=
Make_Adjust_Call
(Obj_Ref => New_Copy_Tree (Lhs),
Typ => Etype (Id));
-- Guard against a missing [Deep_]Adjust when the component type
-- was not properly frozen.
if Present (Adj_Call) then
Append_To (Res, Adj_Call);
end if;
end if;
-- If a component type has a predicate, add check to the component
-- assignment. Discriminants are handled at the point of the call,
-- which provides for a better error message.
if Comes_From_Source (Exp)
and then Predicate_Enabled (Typ)
then
Append (Make_Predicate_Check (Typ, Exp), Res);
end if;
return Res;
exception
when RE_Not_Available =>
return Empty_List;
end Build_Assignment;
------------------------------------
-- Build_Discriminant_Assignments --
------------------------------------
procedure Build_Discriminant_Assignments (Statement_List : List_Id) is
Is_Tagged : constant Boolean := Is_Tagged_Type (Rec_Type);
D : Entity_Id;
D_Loc : Source_Ptr;
begin
if Has_Discriminants (Rec_Type)
and then not Is_Unchecked_Union (Rec_Type)
then
D := First_Discriminant (Rec_Type);
while Present (D) loop
-- Don't generate the assignment for discriminants in derived
-- tagged types if the discriminant is a renaming of some
-- ancestor discriminant. This initialization will be done
-- when initializing the _parent field of the derived record.
if Is_Tagged
and then Present (Corresponding_Discriminant (D))
then
null;
else
D_Loc := Sloc (D);
Append_List_To (Statement_List,
Build_Assignment (D,
New_Occurrence_Of (Discriminal (D), D_Loc)));
end if;
Next_Discriminant (D);
end loop;
end if;
end Build_Discriminant_Assignments;
--------------------------
-- Build_Init_Call_Thru --
--------------------------
function Build_Init_Call_Thru (Parameters : List_Id) return List_Id is
Parent_Proc : constant Entity_Id :=
Base_Init_Proc (Etype (Rec_Type));
Parent_Type : constant Entity_Id :=
Etype (First_Formal (Parent_Proc));
Uparent_Type : constant Entity_Id :=
Underlying_Type (Parent_Type);
First_Discr_Param : Node_Id;
Arg : Node_Id;
Args : List_Id;
First_Arg : Node_Id;
Parent_Discr : Entity_Id;
Res : List_Id;
begin
-- First argument (_Init) is the object to be initialized.
-- ??? not sure where to get a reasonable Loc for First_Arg
First_Arg :=
OK_Convert_To (Parent_Type,
New_Occurrence_Of
(Defining_Identifier (First (Parameters)), Loc));
Set_Etype (First_Arg, Parent_Type);
Args := New_List (Convert_Concurrent (First_Arg, Rec_Type));
-- In the tasks case,
-- add _Master as the value of the _Master parameter
-- add _Chain as the value of the _Chain parameter.
-- add _Task_Name as the value of the _Task_Name parameter.
-- At the outer level, these will be variables holding the
-- corresponding values obtained from GNARL or the expander.
--
-- At inner levels, they will be the parameters passed down through
-- the outer routines.
First_Discr_Param := Next (First (Parameters));
if Has_Task (Rec_Type) then
if Restriction_Active (No_Task_Hierarchy) then
Append_To
(Args, Make_Integer_Literal (Loc, Library_Task_Level));
else
Append_To (Args, Make_Identifier (Loc, Name_uMaster));
end if;
-- Add _Chain (not done for sequential elaboration policy, see
-- comment for Create_Restricted_Task_Sequential in s-tarest.ads).
if Partition_Elaboration_Policy /= 'S' then
Append_To (Args, Make_Identifier (Loc, Name_uChain));
end if;
Append_To (Args, Make_Identifier (Loc, Name_uTask_Name));
First_Discr_Param := Next (Next (Next (First_Discr_Param)));
end if;
-- Append discriminant values
if Has_Discriminants (Uparent_Type) then
pragma Assert (not Is_Tagged_Type (Uparent_Type));
Parent_Discr := First_Discriminant (Uparent_Type);
while Present (Parent_Discr) loop
-- Get the initial value for this discriminant
-- ??? needs to be cleaned up to use parent_Discr_Constr
-- directly.
declare
Discr : Entity_Id :=
First_Stored_Discriminant (Uparent_Type);
Discr_Value : Elmt_Id :=
First_Elmt (Stored_Constraint (Rec_Type));
begin
while Original_Record_Component (Parent_Discr) /= Discr loop
Next_Stored_Discriminant (Discr);
Next_Elmt (Discr_Value);
end loop;
Arg := Node (Discr_Value);
end;
-- Append it to the list
if Nkind (Arg) = N_Identifier
and then Ekind (Entity (Arg)) = E_Discriminant
then
Append_To (Args,
New_Occurrence_Of (Discriminal (Entity (Arg)), Loc));
-- Case of access discriminants. We replace the reference
-- to the type by a reference to the actual object.
-- Is above comment right??? Use of New_Copy below seems mighty
-- suspicious ???
else
Append_To (Args, New_Copy (Arg));
end if;
Next_Discriminant (Parent_Discr);
end loop;
end if;
Res :=
New_List (
Make_Procedure_Call_Statement (Loc,
Name =>
New_Occurrence_Of (Parent_Proc, Loc),
Parameter_Associations => Args));
return Res;
end Build_Init_Call_Thru;
-----------------------------------
-- Build_Offset_To_Top_Functions --
-----------------------------------
procedure Build_Offset_To_Top_Functions is
procedure Build_Offset_To_Top_Function (Iface_Comp : Entity_Id);
-- Generate:
-- function Fxx (O : Address) return Storage_Offset is
-- type Acc is access all <Typ>;
-- begin
-- return Acc!(O).Iface_Comp'Position;
-- end Fxx;
----------------------------------
-- Build_Offset_To_Top_Function --
----------------------------------
procedure Build_Offset_To_Top_Function (Iface_Comp : Entity_Id) is
Body_Node : Node_Id;
Func_Id : Entity_Id;
Spec_Node : Node_Id;
Acc_Type : Entity_Id;
begin
Func_Id := Make_Temporary (Loc, 'F');
Set_DT_Offset_To_Top_Func (Iface_Comp, Func_Id);
-- Generate
-- function Fxx (O : in Rec_Typ) return Storage_Offset;
Spec_Node := New_Node (N_Function_Specification, Loc);
Set_Defining_Unit_Name (Spec_Node, Func_Id);
Set_Parameter_Specifications (Spec_Node, New_List (
Make_Parameter_Specification (Loc,
Defining_Identifier =>
Make_Defining_Identifier (Loc, Name_uO),
In_Present => True,
Parameter_Type =>
New_Occurrence_Of (RTE (RE_Address), Loc))));
Set_Result_Definition (Spec_Node,
New_Occurrence_Of (RTE (RE_Storage_Offset), Loc));
-- Generate
-- function Fxx (O : in Rec_Typ) return Storage_Offset is
-- begin
-- return -O.Iface_Comp'Position;
-- end Fxx;
Body_Node := New_Node (N_Subprogram_Body, Loc);
Set_Specification (Body_Node, Spec_Node);
Acc_Type := Make_Temporary (Loc, 'T');
Set_Declarations (Body_Node, New_List (
Make_Full_Type_Declaration (Loc,
Defining_Identifier => Acc_Type,
Type_Definition =>
Make_Access_To_Object_Definition (Loc,
All_Present => True,
Null_Exclusion_Present => False,
Constant_Present => False,
Subtype_Indication =>
New_Occurrence_Of (Rec_Type, Loc)))));
Set_Handled_Statement_Sequence (Body_Node,
Make_Handled_Sequence_Of_Statements (Loc,
Statements => New_List (
Make_Simple_Return_Statement (Loc,
Expression =>
Make_Op_Minus (Loc,
Make_Attribute_Reference (Loc,
Prefix =>
Make_Selected_Component (Loc,
Prefix =>
Make_Explicit_Dereference (Loc,
Unchecked_Convert_To (Acc_Type,
Make_Identifier (Loc, Name_uO))),
Selector_Name =>
New_Occurrence_Of (Iface_Comp, Loc)),
Attribute_Name => Name_Position))))));
Mutate_Ekind (Func_Id, E_Function);
Set_Mechanism (Func_Id, Default_Mechanism);
Set_Is_Internal (Func_Id, True);
if not Debug_Generated_Code then
Set_Debug_Info_Off (Func_Id);
end if;
Analyze (Body_Node);
Append_Freeze_Action (Rec_Type, Body_Node);
end Build_Offset_To_Top_Function;
-- Local variables
Iface_Comp : Node_Id;
Iface_Comp_Elmt : Elmt_Id;
Ifaces_Comp_List : Elist_Id;
-- Start of processing for Build_Offset_To_Top_Functions
begin
-- Offset_To_Top_Functions are built only for derivations of types
-- with discriminants that cover interface types.
-- Nothing is needed either in case of virtual targets, since
-- interfaces are handled directly by the target.
if not Is_Tagged_Type (Rec_Type)
or else Etype (Rec_Type) = Rec_Type
or else not Has_Discriminants (Etype (Rec_Type))
or else not Tagged_Type_Expansion
then
return;
end if;
Collect_Interface_Components (Rec_Type, Ifaces_Comp_List);
-- For each interface type with secondary dispatch table we generate
-- the Offset_To_Top_Functions (required to displace the pointer in
-- interface conversions)
Iface_Comp_Elmt := First_Elmt (Ifaces_Comp_List);
while Present (Iface_Comp_Elmt) loop
Iface_Comp := Node (Iface_Comp_Elmt);
pragma Assert (Is_Interface (Related_Type (Iface_Comp)));
-- If the interface is a parent of Rec_Type it shares the primary
-- dispatch table and hence there is no need to build the function
if not Is_Ancestor (Related_Type (Iface_Comp), Rec_Type,
Use_Full_View => True)
then
Build_Offset_To_Top_Function (Iface_Comp);
end if;
Next_Elmt (Iface_Comp_Elmt);
end loop;
end Build_Offset_To_Top_Functions;
------------------------------
-- Build_CPP_Init_Procedure --
------------------------------
procedure Build_CPP_Init_Procedure is
Body_Node : Node_Id;
Body_Stmts : List_Id;
Flag_Id : Entity_Id;
Handled_Stmt_Node : Node_Id;
Init_Tags_List : List_Id;
Proc_Id : Entity_Id;
Proc_Spec_Node : Node_Id;
begin
-- Check cases requiring no IC routine
if not Is_CPP_Class (Root_Type (Rec_Type))
or else Is_CPP_Class (Rec_Type)
or else CPP_Num_Prims (Rec_Type) = 0
or else not Tagged_Type_Expansion
or else No_Run_Time_Mode
then
return;
end if;
-- Generate:
-- Flag : Boolean := False;
--
-- procedure Typ_IC is
-- begin
-- if not Flag then
-- Copy C++ dispatch table slots from parent
-- Update C++ slots of overridden primitives
-- end if;
-- end;
Flag_Id := Make_Temporary (Loc, 'F');
Append_Freeze_Action (Rec_Type,
Make_Object_Declaration (Loc,
Defining_Identifier => Flag_Id,
Object_Definition =>
New_Occurrence_Of (Standard_Boolean, Loc),
Expression =>
New_Occurrence_Of (Standard_True, Loc)));
Body_Stmts := New_List;
Body_Node := New_Node (N_Subprogram_Body, Loc);
Proc_Spec_Node := New_Node (N_Procedure_Specification, Loc);
Proc_Id :=
Make_Defining_Identifier (Loc,
Chars => Make_TSS_Name (Rec_Type, TSS_CPP_Init_Proc));
Mutate_Ekind (Proc_Id, E_Procedure);
Set_Is_Internal (Proc_Id);
Set_Defining_Unit_Name (Proc_Spec_Node, Proc_Id);
Set_Parameter_Specifications (Proc_Spec_Node, New_List);
Set_Specification (Body_Node, Proc_Spec_Node);
Set_Declarations (Body_Node, New_List);
Init_Tags_List := Build_Inherit_CPP_Prims (Rec_Type);
Append_To (Init_Tags_List,
Make_Assignment_Statement (Loc,
Name =>
New_Occurrence_Of (Flag_Id, Loc),
Expression =>
New_Occurrence_Of (Standard_False, Loc)));
Append_To (Body_Stmts,
Make_If_Statement (Loc,
Condition => New_Occurrence_Of (Flag_Id, Loc),
Then_Statements => Init_Tags_List));
Handled_Stmt_Node :=
New_Node (N_Handled_Sequence_Of_Statements, Loc);
Set_Statements (Handled_Stmt_Node, Body_Stmts);
Set_Exception_Handlers (Handled_Stmt_Node, No_List);
Set_Handled_Statement_Sequence (Body_Node, Handled_Stmt_Node);
if not Debug_Generated_Code then
Set_Debug_Info_Off (Proc_Id);
end if;
-- Associate CPP_Init_Proc with type
Set_Init_Proc (Rec_Type, Proc_Id);
end Build_CPP_Init_Procedure;
--------------------------
-- Build_Init_Procedure --
--------------------------
procedure Build_Init_Procedure is
Body_Stmts : List_Id;
Body_Node : Node_Id;
Handled_Stmt_Node : Node_Id;
Init_Tags_List : List_Id;
Parameters : List_Id;
Proc_Spec_Node : Node_Id;
Record_Extension_Node : Node_Id;
use Initialization_Control;
begin
Body_Stmts := New_List;
Body_Node := New_Node (N_Subprogram_Body, Loc);
Mutate_Ekind (Proc_Id, E_Procedure);
Proc_Spec_Node := New_Node (N_Procedure_Specification, Loc);
Set_Defining_Unit_Name (Proc_Spec_Node, Proc_Id);
Parameters := Init_Formals (Rec_Type, Proc_Id);
Append_List_To (Parameters,
Build_Discriminant_Formals (Rec_Type, True));
-- For tagged types, we add a parameter to indicate what
-- portion of the object's initialization is to be performed.
-- This is used for two purposes:
-- 1) When a type extension's initialization procedure calls
-- the initialization procedure of the parent type, we do
-- not want the parent to initialize the Tag component;
-- it has been set already.
-- 2) If an ancestor type has at least one component that requires
-- late initialization, then we need to be able to initialize
-- those components separately after initializing any other
-- components.
if Is_Tagged_Type (Rec_Type) then
Init_Control_Formal := Make_Temporary (Loc, 'P');
Append_To (Parameters,
Make_Parameter_Specification (Loc,
Defining_Identifier => Init_Control_Formal,
Parameter_Type =>
New_Occurrence_Of (Standard_Natural, Loc),
Expression => Make_Mode_Literal (Loc, Full_Init)));
end if;
-- Create an extra accessibility parameter to capture the level of
-- the object being initialized when its type is a limited record.
if Is_Limited_Record (Rec_Type) then
Append_To (Parameters,
Make_Parameter_Specification (Loc,
Defining_Identifier => Make_Defining_Identifier
(Loc, Name_uInit_Level),
Parameter_Type =>
New_Occurrence_Of (Standard_Natural, Loc),
Expression =>
Make_Integer_Literal
(Loc, Scope_Depth (Standard_Standard))));
end if;
Set_Parameter_Specifications (Proc_Spec_Node, Parameters);
Set_Specification (Body_Node, Proc_Spec_Node);
Set_Declarations (Body_Node, Decls);
-- N is a Derived_Type_Definition that renames the parameters of the
-- ancestor type. We initialize it by expanding our discriminants and
-- call the ancestor _init_proc with a type-converted object.
if Parent_Subtype_Renaming_Discrims then
Append_List_To (Body_Stmts, Build_Init_Call_Thru (Parameters));
elsif Nkind (Type_Definition (N)) = N_Record_Definition then
Build_Discriminant_Assignments (Body_Stmts);
if not Null_Present (Type_Definition (N)) then
Append_List_To (Body_Stmts,
Build_Init_Statements (Component_List (Type_Definition (N))));
end if;
-- N is a Derived_Type_Definition with a possible non-empty
-- extension. The initialization of a type extension consists in the
-- initialization of the components in the extension.
else
Build_Discriminant_Assignments (Body_Stmts);
Record_Extension_Node :=
Record_Extension_Part (Type_Definition (N));
if not Null_Present (Record_Extension_Node) then
declare
Stmts : constant List_Id :=
Build_Init_Statements (
Component_List (Record_Extension_Node));
begin
-- The parent field must be initialized first because the
-- offset of the new discriminants may depend on it. This is
-- not needed if the parent is an interface type because in
-- such case the initialization of the _parent field was not
-- generated.
if not Is_Interface (Etype (Rec_Ent)) then
declare
Parent_IP : constant Name_Id :=
Make_Init_Proc_Name (Etype (Rec_Ent));
Stmt : Node_Id := First (Stmts);
IP_Call : Node_Id := Empty;
begin
-- Look for a call to the parent IP associated with
-- the record extension.
-- The call will be inside not one but two
-- if-statements (with the same condition). Testing
-- the same Early_Init condition twice might seem
-- redundant. However, as soon as we exit this loop,
-- we are going to hoist the inner if-statement out
-- of the outer one; the "redundant" test was built
-- in anticipation of this hoisting.
while Present (Stmt) loop
if Nkind (Stmt) = N_If_Statement then
declare
Then_Stmt1 : Node_Id :=
First (Then_Statements (Stmt));
Then_Stmt2 : Node_Id;
begin
while Present (Then_Stmt1) loop
if Nkind (Then_Stmt1) = N_If_Statement then
Then_Stmt2 :=
First (Then_Statements (Then_Stmt1));
if Nkind (Then_Stmt2) =
N_Procedure_Call_Statement
and then Chars (Name (Then_Stmt2)) =
Parent_IP
then
-- IP_Call is a call wrapped in an
-- if statement.
IP_Call := Then_Stmt1;
exit;
end if;
end if;
Next (Then_Stmt1);
end loop;
end;
end if;
Next (Stmt);
end loop;
-- If found then move it to the beginning of the
-- statements of this IP routine
if Present (IP_Call) then
Remove (IP_Call);
Prepend_List_To (Body_Stmts, New_List (IP_Call));
end if;
end;
end if;
Append_List_To (Body_Stmts, Stmts);
end;
end if;
end if;
-- Add here the assignment to instantiate the Tag
-- The assignment corresponds to the code:
-- _Init._Tag := Typ'Tag;
-- Suppress the tag assignment when not Tagged_Type_Expansion because
-- tags are represented implicitly in objects. It is also suppressed
-- in case of CPP_Class types because in this case the tag is
-- initialized in the C++ side.
if Is_Tagged_Type (Rec_Type)
and then Tagged_Type_Expansion
and then not No_Run_Time_Mode
then
-- Case 1: Ada tagged types with no CPP ancestor. Set the tags of
-- the actual object and invoke the IP of the parent (in this
-- order). The tag must be initialized before the call to the IP
-- of the parent and the assignments to other components because
-- the initial value of the components may depend on the tag (eg.
-- through a dispatching operation on an access to the current
-- type). The tag assignment is not done when initializing the
-- parent component of a type extension, because in that case the
-- tag is set in the extension.
if not Is_CPP_Class (Root_Type (Rec_Type)) then
-- Initialize the primary tag component
Init_Tags_List := New_List (
Make_Assignment_Statement (Loc,
Name =>
Make_Selected_Component (Loc,
Prefix => Make_Identifier (Loc, Name_uInit),
Selector_Name =>
New_Occurrence_Of
(First_Tag_Component (Rec_Type), Loc)),
Expression =>
New_Occurrence_Of
(Node
(First_Elmt (Access_Disp_Table (Rec_Type))), Loc)));
-- Ada 2005 (AI-251): Initialize the secondary tags components
-- located at fixed positions (tags whose position depends on
-- variable size components are initialized later ---see below)
if Ada_Version >= Ada_2005
and then not Is_Interface (Rec_Type)
and then Has_Interfaces (Rec_Type)
then
declare
Elab_Sec_DT_Stmts_List : constant List_Id := New_List;
Elab_List : List_Id := New_List;
begin
Init_Secondary_Tags
(Typ => Rec_Type,
Target => Make_Identifier (Loc, Name_uInit),
Init_Tags_List => Init_Tags_List,
Stmts_List => Elab_Sec_DT_Stmts_List,
Fixed_Comps => True,
Variable_Comps => False);
Elab_List := New_List (
Make_If_Statement (Loc,
Condition =>
Tag_Init_Condition (Loc, Init_Control_Formal),
Then_Statements => Init_Tags_List));
if Elab_Flag_Needed (Rec_Type) then
Append_To (Elab_Sec_DT_Stmts_List,
Make_Assignment_Statement (Loc,
Name =>
New_Occurrence_Of
(Access_Disp_Table_Elab_Flag (Rec_Type),
Loc),
Expression =>
New_Occurrence_Of (Standard_False, Loc)));
Append_To (Elab_List,
Make_If_Statement (Loc,
Condition =>
New_Occurrence_Of
(Access_Disp_Table_Elab_Flag (Rec_Type), Loc),
Then_Statements => Elab_Sec_DT_Stmts_List));
end if;
Prepend_List_To (Body_Stmts, Elab_List);
end;
else
Prepend_To (Body_Stmts,
Make_If_Statement (Loc,
Condition =>
Tag_Init_Condition (Loc, Init_Control_Formal),
Then_Statements => Init_Tags_List));
end if;
-- Case 2: CPP type. The imported C++ constructor takes care of
-- tags initialization. No action needed here because the IP
-- is built by Set_CPP_Constructors; in this case the IP is a
-- wrapper that invokes the C++ constructor and copies the C++
-- tags locally. Done to inherit the C++ slots in Ada derivations
-- (see case 3).
elsif Is_CPP_Class (Rec_Type) then
pragma Assert (False);
null;
-- Case 3: Combined hierarchy containing C++ types and Ada tagged
-- type derivations. Derivations of imported C++ classes add a
-- complication, because we cannot inhibit tag setting in the
-- constructor for the parent. Hence we initialize the tag after
-- the call to the parent IP (that is, in reverse order compared
-- with pure Ada hierarchies ---see comment on case 1).
else
-- Initialize the primary tag
Init_Tags_List := New_List (
Make_Assignment_Statement (Loc,
Name =>
Make_Selected_Component (Loc,
Prefix => Make_Identifier (Loc, Name_uInit),
Selector_Name =>
New_Occurrence_Of
(First_Tag_Component (Rec_Type), Loc)),
Expression =>
New_Occurrence_Of
(Node
(First_Elmt (Access_Disp_Table (Rec_Type))), Loc)));
-- Ada 2005 (AI-251): Initialize the secondary tags components
-- located at fixed positions (tags whose position depends on
-- variable size components are initialized later ---see below)
if Ada_Version >= Ada_2005
and then not Is_Interface (Rec_Type)
and then Has_Interfaces (Rec_Type)
then
Init_Secondary_Tags
(Typ => Rec_Type,
Target => Make_Identifier (Loc, Name_uInit),
Init_Tags_List => Init_Tags_List,
Stmts_List => Init_Tags_List,
Fixed_Comps => True,
Variable_Comps => False);
end if;
-- Initialize the tag component after invocation of parent IP.
-- Generate:
-- parent_IP(_init.parent); // Invokes the C++ constructor
-- [ typIC; ] // Inherit C++ slots from parent
-- init_tags
declare
Ins_Nod : Node_Id;
begin
-- Search for the call to the IP of the parent. We assume
-- that the first init_proc call is for the parent.
-- It is wrapped in an "if Early_Init_Condition"
-- if-statement.
Ins_Nod := First (Body_Stmts);
while Present (Next (Ins_Nod))
and then
(Nkind (Ins_Nod) /= N_If_Statement
or else (Nkind (First (Then_Statements (Ins_Nod)))
/= N_Procedure_Call_Statement)
or else not Is_Init_Proc
(Name (First (Then_Statements
(Ins_Nod)))))
loop
Next (Ins_Nod);
end loop;
-- The IC routine copies the inherited slots of the C+ part
-- of the dispatch table from the parent and updates the
-- overridden C++ slots.
if CPP_Num_Prims (Rec_Type) > 0 then
declare
Init_DT : Entity_Id;
New_Nod : Node_Id;
begin
Init_DT := CPP_Init_Proc (Rec_Type);
pragma Assert (Present (Init_DT));
New_Nod :=
Make_Procedure_Call_Statement (Loc,
New_Occurrence_Of (Init_DT, Loc));
Insert_After (Ins_Nod, New_Nod);
-- Update location of init tag statements
Ins_Nod := New_Nod;
end;
end if;
Insert_List_After (Ins_Nod, Init_Tags_List);
end;
end if;
-- Ada 2005 (AI-251): Initialize the secondary tag components
-- located at variable positions. We delay the generation of this
-- code until here because the value of the attribute 'Position
-- applied to variable size components of the parent type that
-- depend on discriminants is only safely read at runtime after
-- the parent components have been initialized.
if Ada_Version >= Ada_2005
and then not Is_Interface (Rec_Type)
and then Has_Interfaces (Rec_Type)
and then Has_Discriminants (Etype (Rec_Type))
and then Is_Variable_Size_Record (Etype (Rec_Type))
then
Init_Tags_List := New_List;
Init_Secondary_Tags
(Typ => Rec_Type,
Target => Make_Identifier (Loc, Name_uInit),
Init_Tags_List => Init_Tags_List,
Stmts_List => Init_Tags_List,
Fixed_Comps => False,
Variable_Comps => True);
Append_List_To (Body_Stmts, Init_Tags_List);
end if;
end if;
Handled_Stmt_Node := New_Node (N_Handled_Sequence_Of_Statements, Loc);
Set_Statements (Handled_Stmt_Node, Body_Stmts);
-- Generate:
-- Deep_Finalize (_init, C1, ..., CN);
-- raise;
if Counter > 0
and then Needs_Finalization (Rec_Type)
and then not Is_Abstract_Type (Rec_Type)
and then not Restriction_Active (No_Exception_Propagation)
then
declare
DF_Call : Node_Id;
DF_Id : Entity_Id;
begin
-- Create a local version of Deep_Finalize which has indication
-- of partial initialization state.
DF_Id :=
Make_Defining_Identifier (Loc,
Chars => New_External_Name (Name_uFinalizer));
Append_To (Decls, Make_Local_Deep_Finalize (Rec_Type, DF_Id));
DF_Call :=
Make_Procedure_Call_Statement (Loc,
Name => New_Occurrence_Of (DF_Id, Loc),
Parameter_Associations => New_List (
Make_Identifier (Loc, Name_uInit),
New_Occurrence_Of (Standard_False, Loc)));
-- Do not emit warnings related to the elaboration order when a
-- controlled object is declared before the body of Finalize is
-- seen.
if Legacy_Elaboration_Checks then
Set_No_Elaboration_Check (DF_Call);
end if;
Set_Exception_Handlers (Handled_Stmt_Node, New_List (
Make_Exception_Handler (Loc,
Exception_Choices => New_List (
Make_Others_Choice (Loc)),
Statements => New_List (
DF_Call,
Make_Raise_Statement (Loc)))));
end;
else
Set_Exception_Handlers (Handled_Stmt_Node, No_List);
end if;
Set_Handled_Statement_Sequence (Body_Node, Handled_Stmt_Node);
if not Debug_Generated_Code then
Set_Debug_Info_Off (Proc_Id);
end if;
-- Associate Init_Proc with type, and determine if the procedure
-- is null (happens because of the Initialize_Scalars pragma case,
-- where we have to generate a null procedure in case it is called
-- by a client with Initialize_Scalars set). Such procedures have
-- to be generated, but do not have to be called, so we mark them
-- as null to suppress the call. Kill also warnings for the _Init
-- out parameter, which is left entirely uninitialized.
Set_Init_Proc (Rec_Type, Proc_Id);
if Is_Null_Statement_List (Body_Stmts) then
Set_Is_Null_Init_Proc (Proc_Id);
Set_Warnings_Off (Defining_Identifier (First (Parameters)));
end if;
end Build_Init_Procedure;
---------------------------
-- Build_Init_Statements --
---------------------------
function Build_Init_Statements (Comp_List : Node_Id) return List_Id is
Checks : constant List_Id := New_List;
Actions : List_Id := No_List;
Counter_Id : Entity_Id := Empty;
Comp_Loc : Source_Ptr;
Decl : Node_Id;
Id : Entity_Id;
Parent_Stmts : List_Id;
Parent_Id : Entity_Id := Empty;
Stmts, Late_Stmts : List_Id := Empty_List;
Typ : Entity_Id;
procedure Increment_Counter
(Loc : Source_Ptr; Late : Boolean := False);
-- Generate an "increment by one" statement for the current counter
-- and append it to the appropriate statement list.
procedure Make_Counter (Loc : Source_Ptr);
-- Create a new counter for the current component list. The routine
-- creates a new defining Id, adds an object declaration and sets
-- the Id generator for the next variant.
-----------------------
-- Increment_Counter --
-----------------------
procedure Increment_Counter
(Loc : Source_Ptr; Late : Boolean := False) is
begin
-- Generate:
-- Counter := Counter + 1;
Append_To ((if Late then Late_Stmts else Stmts),
Make_Assignment_Statement (Loc,
Name => New_Occurrence_Of (Counter_Id, Loc),
Expression =>
Make_Op_Add (Loc,
Left_Opnd => New_Occurrence_Of (Counter_Id, Loc),
Right_Opnd => Make_Integer_Literal (Loc, 1))));
end Increment_Counter;
------------------
-- Make_Counter --
------------------
procedure Make_Counter (Loc : Source_Ptr) is
begin
-- Increment the Id generator
Counter := Counter + 1;
-- Create the entity and declaration
Counter_Id :=
Make_Defining_Identifier (Loc,
Chars => New_External_Name ('C', Counter));
-- Generate:
-- Cnn : Integer := 0;
Append_To (Decls,
Make_Object_Declaration (Loc,
Defining_Identifier => Counter_Id,
Object_Definition =>
New_Occurrence_Of (Standard_Integer, Loc),
Expression =>
Make_Integer_Literal (Loc, 0)));
end Make_Counter;
-- Start of processing for Build_Init_Statements
begin
if Null_Present (Comp_List) then
return New_List (Make_Null_Statement (Loc));
end if;
Parent_Stmts := New_List;
Stmts := New_List;
-- Loop through visible declarations of task types and protected
-- types moving any expanded code from the spec to the body of the
-- init procedure.
if Is_Concurrent_Record_Type (Rec_Type) then
declare
Decl : constant Node_Id :=
Parent (Corresponding_Concurrent_Type (Rec_Type));
Def : Node_Id;
N1 : Node_Id;
N2 : Node_Id;
begin
if Is_Task_Record_Type (Rec_Type) then
Def := Task_Definition (Decl);
else
Def := Protected_Definition (Decl);
end if;
if Present (Def) then
N1 := First (Visible_Declarations (Def));
while Present (N1) loop
N2 := N1;
N1 := Next (N1);
if Nkind (N2) in N_Statement_Other_Than_Procedure_Call
or else Nkind (N2) in N_Raise_xxx_Error
or else Nkind (N2) = N_Procedure_Call_Statement
then
Append_To (Stmts,
New_Copy_Tree (N2, New_Scope => Proc_Id));
Rewrite (N2, Make_Null_Statement (Sloc (N2)));
Analyze (N2);
end if;
end loop;
end if;
end;
end if;
-- Loop through components, skipping pragmas, in 2 steps. The first
-- step deals with regular components. The second step deals with
-- components that require late initialization.
-- First pass : regular components
Decl := First_Non_Pragma (Component_Items (Comp_List));
while Present (Decl) loop
Comp_Loc := Sloc (Decl);
Build_Record_Checks
(Subtype_Indication (Component_Definition (Decl)), Checks);
Id := Defining_Identifier (Decl);
Typ := Etype (Id);
-- Leave any processing of component requiring late initialization
-- for the second pass.
if Initialization_Control.Requires_Late_Init (Decl, Rec_Type) then
if not Has_Late_Init_Comp then
Late_Stmts := New_List;
end if;
Has_Late_Init_Comp := True;
-- Regular component cases
else
-- In the context of the init proc, references to discriminants
-- resolve to denote the discriminals: this is where we can
-- freeze discriminant dependent component subtypes.
if not Is_Frozen (Typ) then
Append_List_To (Stmts, Freeze_Entity (Typ, N));
end if;
-- Explicit initialization
if Present (Expression (Decl)) then
if Is_CPP_Constructor_Call (Expression (Decl)) then
Actions :=
Build_Initialization_Call
(Comp_Loc,
Id_Ref =>
Make_Selected_Component (Comp_Loc,
Prefix =>
Make_Identifier (Comp_Loc, Name_uInit),
Selector_Name =>
New_Occurrence_Of (Id, Comp_Loc)),
Typ => Typ,
In_Init_Proc => True,
Enclos_Type => Rec_Type,
Discr_Map => Discr_Map,
Constructor_Ref => Expression (Decl));
else
Actions := Build_Assignment (Id, Expression (Decl));
end if;
-- CPU, Dispatching_Domain, Priority, and Secondary_Stack_Size
-- components are filled in with the corresponding rep-item
-- expression of the concurrent type (if any).
elsif Ekind (Scope (Id)) = E_Record_Type
and then Present (Corresponding_Concurrent_Type (Scope (Id)))
and then Chars (Id) in Name_uCPU
| Name_uDispatching_Domain
| Name_uPriority
| Name_uSecondary_Stack_Size
then
declare
Exp : Node_Id;
Nam : Name_Id;
pragma Warnings (Off, Nam);
Ritem : Node_Id;
begin
if Chars (Id) = Name_uCPU then
Nam := Name_CPU;
elsif Chars (Id) = Name_uDispatching_Domain then
Nam := Name_Dispatching_Domain;
elsif Chars (Id) = Name_uPriority then
Nam := Name_Priority;
elsif Chars (Id) = Name_uSecondary_Stack_Size then
Nam := Name_Secondary_Stack_Size;
end if;
-- Get the Rep Item (aspect specification, attribute
-- definition clause or pragma) of the corresponding
-- concurrent type.
Ritem :=
Get_Rep_Item
(Corresponding_Concurrent_Type (Scope (Id)),
Nam,
Check_Parents => False);
if Present (Ritem) then
-- Pragma case
if Nkind (Ritem) = N_Pragma then
Exp :=
Get_Pragma_Arg
(First (Pragma_Argument_Associations (Ritem)));
-- Conversion for Priority expression
if Nam = Name_Priority then
if Pragma_Name (Ritem) = Name_Priority
and then not GNAT_Mode
then
Exp := Convert_To (RTE (RE_Priority), Exp);
else
Exp :=
Convert_To (RTE (RE_Any_Priority), Exp);
end if;
end if;
-- Aspect/Attribute definition clause case
else
Exp := Expression (Ritem);
-- Conversion for Priority expression
if Nam = Name_Priority then
if Chars (Ritem) = Name_Priority
and then not GNAT_Mode
then
Exp := Convert_To (RTE (RE_Priority), Exp);
else
Exp :=
Convert_To (RTE (RE_Any_Priority), Exp);
end if;
end if;
end if;
-- Conversion for Dispatching_Domain value
if Nam = Name_Dispatching_Domain then
Exp :=
Unchecked_Convert_To
(RTE (RE_Dispatching_Domain_Access), Exp);
-- Conversion for Secondary_Stack_Size value
elsif Nam = Name_Secondary_Stack_Size then
Exp := Convert_To (RTE (RE_Size_Type), Exp);
end if;
Actions := Build_Assignment (Id, Exp);
-- Nothing needed if no Rep Item
else
Actions := No_List;
end if;
end;
-- Composite component with its own Init_Proc
elsif not Is_Interface (Typ)
and then Has_Non_Null_Base_Init_Proc (Typ)
then
declare
use Initialization_Control;
Init_Control_Actual : Node_Id := Empty;
Is_Parent : constant Boolean := Chars (Id) = Name_uParent;
Init_Call_Stmts : List_Id;
begin
if Is_Parent and then Has_Late_Init_Component (Etype (Id))
then
Init_Control_Actual :=
Make_Mode_Literal (Comp_Loc, Early_Init_Only);
-- Parent_Id used later in second call to parent's
-- init proc to initialize late-init components.
Parent_Id := Id;
end if;
Init_Call_Stmts :=
Build_Initialization_Call
(Comp_Loc,
Make_Selected_Component (Comp_Loc,
Prefix =>
Make_Identifier (Comp_Loc, Name_uInit),
Selector_Name => New_Occurrence_Of (Id, Comp_Loc)),
Typ,
In_Init_Proc => True,
Enclos_Type => Rec_Type,
Discr_Map => Discr_Map,
Init_Control_Actual => Init_Control_Actual);
if Is_Parent then
-- This is tricky. At first it looks like
-- we are going to end up with nested
-- if-statements with the same condition:
-- if Early_Init_Condition then
-- if Early_Init_Condition then
-- Parent_TypeIP (...);
-- end if;
-- end if;
-- But later we will hoist the inner if-statement
-- out of the outer one; we do this because the
-- init-proc call for the _Parent component of a type
-- extension has to precede any other initialization.
Actions :=
New_List (Make_If_Statement (Loc,
Condition =>
Early_Init_Condition (Loc, Init_Control_Formal),
Then_Statements => Init_Call_Stmts));
else
Actions := Init_Call_Stmts;
end if;
end;
Clean_Task_Names (Typ, Proc_Id);
-- Simple initialization. If the Esize is not yet set, we pass
-- Uint_0 as expected by Get_Simple_Init_Val.
elsif Component_Needs_Simple_Initialization (Typ) then
Actions :=
Build_Assignment
(Id => Id,
Default =>
Get_Simple_Init_Val
(Typ => Typ,
N => N,
Size =>
(if Known_Esize (Id) then Esize (Id)
else Uint_0)));
-- Nothing needed for this case
else
Actions := No_List;
end if;
-- When the component's type has a Default_Initial_Condition,
-- and the component is default initialized, then check the
-- DIC here.
if Has_DIC (Typ)
and then No (Expression (Decl))
and then Present (DIC_Procedure (Typ))
and then not Has_Null_Body (DIC_Procedure (Typ))
-- The DICs of ancestors are checked as part of the type's
-- DIC procedure.
and then Chars (Id) /= Name_uParent
-- In GNATprove mode, the component DICs are checked by other
-- means. They should not be added to the record type DIC
-- procedure, so that the procedure can be used to check the
-- record type invariants or DICs if any.
and then not GNATprove_Mode
then
Append_New_To (Actions,
Build_DIC_Call
(Comp_Loc,
Make_Selected_Component (Comp_Loc,
Prefix =>
Make_Identifier (Comp_Loc, Name_uInit),
Selector_Name =>
New_Occurrence_Of (Id, Comp_Loc)),
Typ));
end if;
if Present (Checks) then
if Chars (Id) = Name_uParent then
Append_List_To (Parent_Stmts, Checks);
else
Append_List_To (Stmts, Checks);
end if;
end if;
if Present (Actions) then
if Chars (Id) = Name_uParent then
Append_List_To (Parent_Stmts, Actions);
else
Append_List_To (Stmts, Actions);
-- Preserve initialization state in the current counter
if Needs_Finalization (Typ) then
if No (Counter_Id) then
Make_Counter (Comp_Loc);
end if;
Increment_Counter (Comp_Loc);
end if;
end if;
end if;
end if;
Next_Non_Pragma (Decl);
end loop;
-- The parent field must be initialized first because variable
-- size components of the parent affect the location of all the
-- new components.
Prepend_List_To (Stmts, Parent_Stmts);
-- Set up tasks and protected object support. This needs to be done
-- before any component with a per-object access discriminant
-- constraint, or any variant part (which may contain such
-- components) is initialized, because the initialization of these
-- components may reference the enclosing concurrent object.
-- For a task record type, add the task create call and calls to bind
-- any interrupt (signal) entries.
if Is_Task_Record_Type (Rec_Type) then
-- In the case of the restricted run time the ATCB has already
-- been preallocated.
if Restricted_Profile then
Append_To (Stmts,
Make_Assignment_Statement (Loc,
Name =>
Make_Selected_Component (Loc,
Prefix => Make_Identifier (Loc, Name_uInit),
Selector_Name => Make_Identifier (Loc, Name_uTask_Id)),
Expression =>
Make_Attribute_Reference (Loc,
Prefix =>
Make_Selected_Component (Loc,
Prefix => Make_Identifier (Loc, Name_uInit),
Selector_Name => Make_Identifier (Loc, Name_uATCB)),
Attribute_Name => Name_Unchecked_Access)));
end if;
Append_To (Stmts, Make_Task_Create_Call (Rec_Type));
declare
Task_Type : constant Entity_Id :=
Corresponding_Concurrent_Type (Rec_Type);
Task_Decl : constant Node_Id := Parent (Task_Type);
Task_Def : constant Node_Id := Task_Definition (Task_Decl);
Decl_Loc : Source_Ptr;
Ent : Entity_Id;
Vis_Decl : Node_Id;
begin
if Present (Task_Def) then
Vis_Decl := First (Visible_Declarations (Task_Def));
while Present (Vis_Decl) loop
Decl_Loc := Sloc (Vis_Decl);
if Nkind (Vis_Decl) = N_Attribute_Definition_Clause then
if Get_Attribute_Id (Chars (Vis_Decl)) =
Attribute_Address
then
Ent := Entity (Name (Vis_Decl));
if Ekind (Ent) = E_Entry then
Append_To (Stmts,
Make_Procedure_Call_Statement (Decl_Loc,
Name =>
New_Occurrence_Of (RTE (
RE_Bind_Interrupt_To_Entry), Decl_Loc),
Parameter_Associations => New_List (
Make_Selected_Component (Decl_Loc,
Prefix =>
Make_Identifier (Decl_Loc, Name_uInit),
Selector_Name =>
Make_Identifier
(Decl_Loc, Name_uTask_Id)),
Entry_Index_Expression
(Decl_Loc, Ent, Empty, Task_Type),
Expression (Vis_Decl))));
end if;
end if;
end if;
Next (Vis_Decl);
end loop;
end if;
end;
-- For a protected type, add statements generated by
-- Make_Initialize_Protection.
elsif Is_Protected_Record_Type (Rec_Type) then
Append_List_To (Stmts,
Make_Initialize_Protection (Rec_Type));
end if;
-- Second pass: components that require late initialization
if Present (Parent_Id) then
declare
Parent_Loc : constant Source_Ptr := Sloc (Parent (Parent_Id));
use Initialization_Control;
begin
-- We are building the init proc for a type extension.
-- Call the parent type's init proc a second time, this
-- time to initialize the parent's components that require
-- late initialization.
Append_List_To (Late_Stmts,
Build_Initialization_Call
(Loc => Parent_Loc,
Id_Ref =>
Make_Selected_Component (Parent_Loc,
Prefix => Make_Identifier
(Parent_Loc, Name_uInit),
Selector_Name => New_Occurrence_Of (Parent_Id,
Parent_Loc)),
Typ => Etype (Parent_Id),
In_Init_Proc => True,
Enclos_Type => Rec_Type,
Discr_Map => Discr_Map,
Init_Control_Actual => Make_Mode_Literal
(Parent_Loc, Late_Init_Only)));
end;
end if;
if Has_Late_Init_Comp then
Decl := First_Non_Pragma (Component_Items (Comp_List));
while Present (Decl) loop
Comp_Loc := Sloc (Decl);
Id := Defining_Identifier (Decl);
Typ := Etype (Id);
if Initialization_Control.Requires_Late_Init (Decl, Rec_Type)
then
if Present (Expression (Decl)) then
Append_List_To (Late_Stmts,
Build_Assignment (Id, Expression (Decl)));
elsif Has_Non_Null_Base_Init_Proc (Typ) then
Append_List_To (Late_Stmts,
Build_Initialization_Call (Comp_Loc,
Make_Selected_Component (Comp_Loc,
Prefix =>
Make_Identifier (Comp_Loc, Name_uInit),
Selector_Name => New_Occurrence_Of (Id, Comp_Loc)),
Typ,
In_Init_Proc => True,
Enclos_Type => Rec_Type,
Discr_Map => Discr_Map));
Clean_Task_Names (Typ, Proc_Id);
-- Preserve initialization state in the current counter
if Needs_Finalization (Typ) then
if No (Counter_Id) then
Make_Counter (Comp_Loc);
end if;
Increment_Counter (Comp_Loc, Late => True);
end if;
elsif Component_Needs_Simple_Initialization (Typ) then
Append_List_To (Late_Stmts,
Build_Assignment
(Id => Id,
Default =>
Get_Simple_Init_Val
(Typ => Typ,
N => N,
Size => Esize (Id))));
end if;
end if;
Next_Non_Pragma (Decl);
end loop;
end if;
-- Process the variant part (incorrectly ignoring late
-- initialization requirements for components therein).
if Present (Variant_Part (Comp_List)) then
declare
Variant_Alts : constant List_Id := New_List;
Var_Loc : Source_Ptr := No_Location;
Variant : Node_Id;
begin
Variant :=
First_Non_Pragma (Variants (Variant_Part (Comp_List)));
while Present (Variant) loop
Var_Loc := Sloc (Variant);
Append_To (Variant_Alts,
Make_Case_Statement_Alternative (Var_Loc,
Discrete_Choices =>
New_Copy_List (Discrete_Choices (Variant)),
Statements =>
Build_Init_Statements (Component_List (Variant))));
Next_Non_Pragma (Variant);
end loop;
-- The expression of the case statement which is a reference
-- to one of the discriminants is replaced by the appropriate
-- formal parameter of the initialization procedure.
Append_To (Stmts,
Make_Case_Statement (Var_Loc,
Expression =>
New_Occurrence_Of (Discriminal (
Entity (Name (Variant_Part (Comp_List)))), Var_Loc),
Alternatives => Variant_Alts));
end;
end if;
if No (Init_Control_Formal) then
Append_List_To (Stmts, Late_Stmts);
-- If no initializations were generated for component declarations
-- and included in Stmts, then append a null statement to Stmts
-- to make it a valid Ada tree.
if Is_Empty_List (Stmts) then
Append (Make_Null_Statement (Loc), Stmts);
end if;
return Stmts;
else
declare
use Initialization_Control;
If_Early : constant Node_Id :=
(if Is_Empty_List (Stmts) then
Make_Null_Statement (Loc)
else
Make_If_Statement (Loc,
Condition =>
Early_Init_Condition (Loc, Init_Control_Formal),
Then_Statements => Stmts));
If_Late : constant Node_Id :=
(if Is_Empty_List (Late_Stmts) then
Make_Null_Statement (Loc)
else
Make_If_Statement (Loc,
Condition =>
Late_Init_Condition (Loc, Init_Control_Formal),
Then_Statements => Late_Stmts));
begin
return New_List (If_Early, If_Late);
end;
end if;
exception
when RE_Not_Available =>
return Empty_List;
end Build_Init_Statements;
-------------------------
-- Build_Record_Checks --
-------------------------
procedure Build_Record_Checks (S : Node_Id; Check_List : List_Id) is
Subtype_Mark_Id : Entity_Id;
procedure Constrain_Array
(SI : Node_Id;
Check_List : List_Id);
-- Apply a list of index constraints to an unconstrained array type.
-- The first parameter is the entity for the resulting subtype.
-- Check_List is a list to which the check actions are appended.
---------------------
-- Constrain_Array --
---------------------
procedure Constrain_Array
(SI : Node_Id;
Check_List : List_Id)
is
C : constant Node_Id := Constraint (SI);
Number_Of_Constraints : Nat := 0;
Index : Node_Id;
S, T : Entity_Id;
procedure Constrain_Index
(Index : Node_Id;
S : Node_Id;
Check_List : List_Id);
-- Process an index constraint in a constrained array declaration.
-- The constraint can be either a subtype name or a range with or
-- without an explicit subtype mark. Index is the corresponding
-- index of the unconstrained array. S is the range expression.
-- Check_List is a list to which the check actions are appended.
---------------------
-- Constrain_Index --
---------------------
procedure Constrain_Index
(Index : Node_Id;
S : Node_Id;
Check_List : List_Id)
is
T : constant Entity_Id := Etype (Index);
begin
if Nkind (S) = N_Range then
Process_Range_Expr_In_Decl (S, T, Check_List => Check_List);
end if;
end Constrain_Index;
-- Start of processing for Constrain_Array
begin
T := Entity (Subtype_Mark (SI));
if Is_Access_Type (T) then
T := Designated_Type (T);
end if;
S := First (Constraints (C));
while Present (S) loop
Number_Of_Constraints := Number_Of_Constraints + 1;
Next (S);
end loop;
-- In either case, the index constraint must provide a discrete
-- range for each index of the array type and the type of each
-- discrete range must be the same as that of the corresponding
-- index. (RM 3.6.1)
S := First (Constraints (C));
Index := First_Index (T);
Analyze (Index);
-- Apply constraints to each index type
for J in 1 .. Number_Of_Constraints loop
Constrain_Index (Index, S, Check_List);
Next (Index);
Next (S);
end loop;
end Constrain_Array;
-- Start of processing for Build_Record_Checks
begin
if Nkind (S) = N_Subtype_Indication then
Find_Type (Subtype_Mark (S));
Subtype_Mark_Id := Entity (Subtype_Mark (S));
-- Remaining processing depends on type
case Ekind (Subtype_Mark_Id) is
when Array_Kind =>
Constrain_Array (S, Check_List);
when others =>
null;
end case;
end if;
end Build_Record_Checks;
-------------------------------------------
-- Component_Needs_Simple_Initialization --
-------------------------------------------
function Component_Needs_Simple_Initialization
(T : Entity_Id) return Boolean
is
begin
return
Needs_Simple_Initialization (T)
and then not Is_RTE (T, RE_Tag)
-- Ada 2005 (AI-251): Check also the tag of abstract interfaces
and then not Is_RTE (T, RE_Interface_Tag);
end Component_Needs_Simple_Initialization;
--------------------------------------
-- Parent_Subtype_Renaming_Discrims --
--------------------------------------
function Parent_Subtype_Renaming_Discrims return Boolean is
De : Entity_Id;
Dp : Entity_Id;
begin
if Base_Type (Rec_Ent) /= Rec_Ent then
return False;
end if;
if Etype (Rec_Ent) = Rec_Ent
or else not Has_Discriminants (Rec_Ent)
or else Is_Constrained (Rec_Ent)
or else Is_Tagged_Type (Rec_Ent)
then
return False;
end if;
-- If there are no explicit stored discriminants we have inherited
-- the root type discriminants so far, so no renamings occurred.
if First_Discriminant (Rec_Ent) =
First_Stored_Discriminant (Rec_Ent)
then
return False;
end if;
-- Check if we have done some trivial renaming of the parent
-- discriminants, i.e. something like
--
-- type DT (X1, X2: int) is new PT (X1, X2);
De := First_Discriminant (Rec_Ent);
Dp := First_Discriminant (Etype (Rec_Ent));
while Present (De) loop
pragma Assert (Present (Dp));
if Corresponding_Discriminant (De) /= Dp then
return True;
end if;
Next_Discriminant (De);
Next_Discriminant (Dp);
end loop;
return Present (Dp);
end Parent_Subtype_Renaming_Discrims;
------------------------
-- Requires_Init_Proc --
------------------------
function Requires_Init_Proc (Rec_Id : Entity_Id) return Boolean is
Comp_Decl : Node_Id;
Id : Entity_Id;
Typ : Entity_Id;
begin
-- Definitely do not need one if specifically suppressed
if Initialization_Suppressed (Rec_Id) then
return False;
end if;
-- If it is a type derived from a type with unknown discriminants,
-- we cannot build an initialization procedure for it.
if Has_Unknown_Discriminants (Rec_Id)
or else Has_Unknown_Discriminants (Etype (Rec_Id))
then
return False;
end if;
-- Otherwise we need to generate an initialization procedure if
-- Is_CPP_Class is False and at least one of the following applies:
-- 1. Discriminants are present, since they need to be initialized
-- with the appropriate discriminant constraint expressions.
-- However, the discriminant of an unchecked union does not
-- count, since the discriminant is not present.
-- 2. The type is a tagged type, since the implicit Tag component
-- needs to be initialized with a pointer to the dispatch table.
-- 3. The type contains tasks
-- 4. One or more components has an initial value
-- 5. One or more components is for a type which itself requires
-- an initialization procedure.
-- 6. One or more components is a type that requires simple
-- initialization (see Needs_Simple_Initialization), except
-- that types Tag and Interface_Tag are excluded, since fields
-- of these types are initialized by other means.
-- 7. The type is the record type built for a task type (since at
-- the very least, Create_Task must be called)
-- 8. The type is the record type built for a protected type (since
-- at least Initialize_Protection must be called)
-- 9. The type is marked as a public entity. The reason we add this
-- case (even if none of the above apply) is to properly handle
-- Initialize_Scalars. If a package is compiled without an IS
-- pragma, and the client is compiled with an IS pragma, then
-- the client will think an initialization procedure is present
-- and call it, when in fact no such procedure is required, but
-- since the call is generated, there had better be a routine
-- at the other end of the call, even if it does nothing).
-- Note: the reason we exclude the CPP_Class case is because in this
-- case the initialization is performed by the C++ constructors, and
-- the IP is built by Set_CPP_Constructors.
if Is_CPP_Class (Rec_Id) then
return False;
elsif Is_Interface (Rec_Id) then
return False;
elsif (Has_Discriminants (Rec_Id)
and then not Is_Unchecked_Union (Rec_Id))
or else Is_Tagged_Type (Rec_Id)
or else Is_Concurrent_Record_Type (Rec_Id)
or else Has_Task (Rec_Id)
then
return True;
end if;
Id := First_Component (Rec_Id);
while Present (Id) loop
Comp_Decl := Parent (Id);
Typ := Etype (Id);
if Present (Expression (Comp_Decl))
or else Has_Non_Null_Base_Init_Proc (Typ)
or else Component_Needs_Simple_Initialization (Typ)
then
return True;
end if;
Next_Component (Id);
end loop;
-- As explained above, a record initialization procedure is needed
-- for public types in case Initialize_Scalars applies to a client.
-- However, such a procedure is not needed in the case where either
-- of restrictions No_Initialize_Scalars or No_Default_Initialization
-- applies. No_Initialize_Scalars excludes the possibility of using
-- Initialize_Scalars in any partition, and No_Default_Initialization
-- implies that no initialization should ever be done for objects of
-- the type, so is incompatible with Initialize_Scalars.
if not Restriction_Active (No_Initialize_Scalars)
and then not Restriction_Active (No_Default_Initialization)
and then Is_Public (Rec_Id)
then
return True;
end if;
return False;
end Requires_Init_Proc;
-- Start of processing for Build_Record_Init_Proc
begin
Rec_Type := Defining_Identifier (N);
-- This may be full declaration of a private type, in which case
-- the visible entity is a record, and the private entity has been
-- exchanged with it in the private part of the current package.
-- The initialization procedure is built for the record type, which
-- is retrievable from the private entity.
if Is_Incomplete_Or_Private_Type (Rec_Type) then
Rec_Type := Underlying_Type (Rec_Type);
end if;
-- If we have a variant record with restriction No_Implicit_Conditionals
-- in effect, then we skip building the procedure. This is safe because
-- if we can see the restriction, so can any caller, calls to initialize
-- such records are not allowed for variant records if this restriction
-- is active.
if Has_Variant_Part (Rec_Type)
and then Restriction_Active (No_Implicit_Conditionals)
then
return;
end if;
-- If there are discriminants, build the discriminant map to replace
-- discriminants by their discriminals in complex bound expressions.
-- These only arise for the corresponding records of synchronized types.
if Is_Concurrent_Record_Type (Rec_Type)
and then Has_Discriminants (Rec_Type)
then
declare
Disc : Entity_Id;
begin
Disc := First_Discriminant (Rec_Type);
while Present (Disc) loop
Append_Elmt (Disc, Discr_Map);
Append_Elmt (Discriminal (Disc), Discr_Map);
Next_Discriminant (Disc);
end loop;
end;
end if;
-- Derived types that have no type extension can use the initialization
-- procedure of their parent and do not need a procedure of their own.
-- This is only correct if there are no representation clauses for the
-- type or its parent, and if the parent has in fact been frozen so
-- that its initialization procedure exists.
if Is_Derived_Type (Rec_Type)
and then not Is_Tagged_Type (Rec_Type)
and then not Is_Unchecked_Union (Rec_Type)
and then not Has_New_Non_Standard_Rep (Rec_Type)
and then not Parent_Subtype_Renaming_Discrims
and then Present (Base_Init_Proc (Etype (Rec_Type)))
then
Copy_TSS (Base_Init_Proc (Etype (Rec_Type)), Rec_Type);
-- Otherwise if we need an initialization procedure, then build one,
-- mark it as public and inlinable and as having a completion.
elsif Requires_Init_Proc (Rec_Type)
or else Is_Unchecked_Union (Rec_Type)
then
Proc_Id :=
Make_Defining_Identifier (Loc,
Chars => Make_Init_Proc_Name (Rec_Type));
-- If No_Default_Initialization restriction is active, then we don't
-- want to build an init_proc, but we need to mark that an init_proc
-- would be needed if this restriction was not active (so that we can
-- detect attempts to call it), so set a dummy init_proc in place.
if Restriction_Active (No_Default_Initialization) then
Set_Init_Proc (Rec_Type, Proc_Id);
return;
end if;
Build_Offset_To_Top_Functions;
Build_CPP_Init_Procedure;
Build_Init_Procedure;
Set_Is_Public (Proc_Id, Is_Public (Rec_Ent));
Set_Is_Internal (Proc_Id);
Set_Has_Completion (Proc_Id);
if not Debug_Generated_Code then
Set_Debug_Info_Off (Proc_Id);
end if;
Set_Is_Inlined (Proc_Id, Inline_Init_Proc (Rec_Type));
-- Do not build an aggregate if Modify_Tree_For_C, this isn't
-- needed and may generate early references to non frozen types
-- since we expand aggregate much more systematically.
if Modify_Tree_For_C then
return;
end if;
declare
Agg : constant Node_Id :=
Build_Equivalent_Record_Aggregate (Rec_Type);
procedure Collect_Itypes (Comp : Node_Id);
-- Generate references to itypes in the aggregate, because
-- the first use of the aggregate may be in a nested scope.
--------------------
-- Collect_Itypes --
--------------------
procedure Collect_Itypes (Comp : Node_Id) is
Ref : Node_Id;
Sub_Aggr : Node_Id;
Typ : constant Entity_Id := Etype (Comp);
begin
if Is_Array_Type (Typ) and then Is_Itype (Typ) then
Ref := Make_Itype_Reference (Loc);
Set_Itype (Ref, Typ);
Append_Freeze_Action (Rec_Type, Ref);
Ref := Make_Itype_Reference (Loc);
Set_Itype (Ref, Etype (First_Index (Typ)));
Append_Freeze_Action (Rec_Type, Ref);
-- Recurse on nested arrays
Sub_Aggr := First (Expressions (Comp));
while Present (Sub_Aggr) loop
Collect_Itypes (Sub_Aggr);
Next (Sub_Aggr);
end loop;
end if;
end Collect_Itypes;
begin
-- If there is a static initialization aggregate for the type,
-- generate itype references for the types of its (sub)components,
-- to prevent out-of-scope errors in the resulting tree.
-- The aggregate may have been rewritten as a Raise node, in which
-- case there are no relevant itypes.
if Present (Agg) and then Nkind (Agg) = N_Aggregate then
Set_Static_Initialization (Proc_Id, Agg);
declare
Comp : Node_Id;
begin
Comp := First (Component_Associations (Agg));
while Present (Comp) loop
Collect_Itypes (Expression (Comp));
Next (Comp);
end loop;
end;
end if;
end;
end if;
end Build_Record_Init_Proc;
----------------------------
-- Build_Slice_Assignment --
----------------------------
-- Generates the following subprogram:
-- procedure array_typeSA
-- (Source, Target : Array_Type,
-- Left_Lo, Left_Hi : Index;