| ------------------------------------------------------------------------------ |
| -- -- |
| -- GNAT COMPILER COMPONENTS -- |
| -- -- |
| -- S E M _ A G G R -- |
| -- -- |
| -- B o d y -- |
| -- -- |
| -- Copyright (C) 1992-2019, 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 Einfo; use Einfo; |
| with Elists; use Elists; |
| with Errout; use Errout; |
| with Expander; use Expander; |
| with Exp_Ch6; use Exp_Ch6; |
| with Exp_Tss; use Exp_Tss; |
| with Exp_Util; use Exp_Util; |
| with Freeze; use Freeze; |
| with Itypes; use Itypes; |
| with Lib; use Lib; |
| with Lib.Xref; use Lib.Xref; |
| with Namet; use Namet; |
| with Namet.Sp; use Namet.Sp; |
| with Nmake; use Nmake; |
| with Nlists; use Nlists; |
| with Opt; use Opt; |
| with Restrict; use Restrict; |
| with Rident; use Rident; |
| with Sem; use Sem; |
| with Sem_Aux; use Sem_Aux; |
| with Sem_Cat; use Sem_Cat; |
| with Sem_Ch3; use Sem_Ch3; |
| with Sem_Ch8; use Sem_Ch8; |
| with Sem_Ch13; use Sem_Ch13; |
| with Sem_Dim; use Sem_Dim; |
| with Sem_Eval; use Sem_Eval; |
| with Sem_Res; use Sem_Res; |
| with Sem_Util; use Sem_Util; |
| with Sem_Type; use Sem_Type; |
| with Sem_Warn; use Sem_Warn; |
| with Sinfo; use Sinfo; |
| with Snames; use Snames; |
| with Stringt; use Stringt; |
| with Stand; use Stand; |
| with Style; use Style; |
| with Targparm; use Targparm; |
| with Tbuild; use Tbuild; |
| with Uintp; use Uintp; |
| |
| package body Sem_Aggr is |
| |
| type Case_Bounds is record |
| Lo : Node_Id; |
| -- Low bound of choice. Once we sort the Case_Table, then entries |
| -- will be in order of ascending Choice_Lo values. |
| |
| Hi : Node_Id; |
| -- High Bound of choice. The sort does not pay any attention to the |
| -- high bound, so choices 1 .. 4 and 1 .. 5 could be in either order. |
| |
| Highest : Uint; |
| -- If there are duplicates or missing entries, then in the sorted |
| -- table, this records the highest value among Choice_Hi values |
| -- seen so far, including this entry. |
| |
| Choice : Node_Id; |
| -- The node of the choice |
| end record; |
| |
| type Case_Table_Type is array (Nat range <>) of Case_Bounds; |
| -- Table type used by Check_Case_Choices procedure. Entry zero is not |
| -- used (reserved for the sort). Real entries start at one. |
| |
| ----------------------- |
| -- Local Subprograms -- |
| ----------------------- |
| |
| procedure Sort_Case_Table (Case_Table : in out Case_Table_Type); |
| -- Sort the Case Table using the Lower Bound of each Choice as the key. A |
| -- simple insertion sort is used since the choices in a case statement will |
| -- usually be in near sorted order. |
| |
| procedure Check_Can_Never_Be_Null (Typ : Entity_Id; Expr : Node_Id); |
| -- Ada 2005 (AI-231): Check bad usage of null for a component for which |
| -- null exclusion (NOT NULL) is specified. Typ can be an E_Array_Type for |
| -- the array case (the component type of the array will be used) or an |
| -- E_Component/E_Discriminant entity in the record case, in which case the |
| -- type of the component will be used for the test. If Typ is any other |
| -- kind of entity, the call is ignored. Expr is the component node in the |
| -- aggregate which is known to have a null value. A warning message will be |
| -- issued if the component is null excluding. |
| -- |
| -- It would be better to pass the proper type for Typ ??? |
| |
| procedure Check_Expr_OK_In_Limited_Aggregate (Expr : Node_Id); |
| -- Check that Expr is either not limited or else is one of the cases of |
| -- expressions allowed for a limited component association (namely, an |
| -- aggregate, function call, or <> notation). Report error for violations. |
| -- Expression is also OK in an instance or inlining context, because we |
| -- have already preanalyzed and it is known to be type correct. |
| |
| procedure Check_Qualified_Aggregate (Level : Nat; Expr : Node_Id); |
| -- Given aggregate Expr, check that sub-aggregates of Expr that are nested |
| -- at Level are qualified. If Level = 0, this applies to Expr directly. |
| -- Only issue errors in formal verification mode. |
| |
| function Is_Top_Level_Aggregate (Expr : Node_Id) return Boolean; |
| -- Return True of Expr is an aggregate not contained directly in another |
| -- aggregate. |
| |
| ------------------------------------------------------ |
| -- Subprograms used for RECORD AGGREGATE Processing -- |
| ------------------------------------------------------ |
| |
| procedure Resolve_Record_Aggregate (N : Node_Id; Typ : Entity_Id); |
| -- This procedure performs all the semantic checks required for record |
| -- aggregates. Note that for aggregates analysis and resolution go |
| -- hand in hand. Aggregate analysis has been delayed up to here and |
| -- it is done while resolving the aggregate. |
| -- |
| -- N is the N_Aggregate node. |
| -- Typ is the record type for the aggregate resolution |
| -- |
| -- While performing the semantic checks, this procedure builds a new |
| -- Component_Association_List where each record field appears alone in a |
| -- Component_Choice_List along with its corresponding expression. The |
| -- record fields in the Component_Association_List appear in the same order |
| -- in which they appear in the record type Typ. |
| -- |
| -- Once this new Component_Association_List is built and all the semantic |
| -- checks performed, the original aggregate subtree is replaced with the |
| -- new named record aggregate just built. Note that subtree substitution is |
| -- performed with Rewrite so as to be able to retrieve the original |
| -- aggregate. |
| -- |
| -- The aggregate subtree manipulation performed by Resolve_Record_Aggregate |
| -- yields the aggregate format expected by Gigi. Typically, this kind of |
| -- tree manipulations are done in the expander. However, because the |
| -- semantic checks that need to be performed on record aggregates really go |
| -- hand in hand with the record aggregate normalization, the aggregate |
| -- subtree transformation is performed during resolution rather than |
| -- expansion. Had we decided otherwise we would have had to duplicate most |
| -- of the code in the expansion procedure Expand_Record_Aggregate. Note, |
| -- however, that all the expansion concerning aggregates for tagged records |
| -- is done in Expand_Record_Aggregate. |
| -- |
| -- The algorithm of Resolve_Record_Aggregate proceeds as follows: |
| -- |
| -- 1. Make sure that the record type against which the record aggregate |
| -- has to be resolved is not abstract. Furthermore if the type is a |
| -- null aggregate make sure the input aggregate N is also null. |
| -- |
| -- 2. Verify that the structure of the aggregate is that of a record |
| -- aggregate. Specifically, look for component associations and ensure |
| -- that each choice list only has identifiers or the N_Others_Choice |
| -- node. Also make sure that if present, the N_Others_Choice occurs |
| -- last and by itself. |
| -- |
| -- 3. If Typ contains discriminants, the values for each discriminant is |
| -- looked for. If the record type Typ has variants, we check that the |
| -- expressions corresponding to each discriminant ruling the (possibly |
| -- nested) variant parts of Typ, are static. This allows us to determine |
| -- the variant parts to which the rest of the aggregate must conform. |
| -- The names of discriminants with their values are saved in a new |
| -- association list, New_Assoc_List which is later augmented with the |
| -- names and values of the remaining components in the record type. |
| -- |
| -- During this phase we also make sure that every discriminant is |
| -- assigned exactly one value. Note that when several values for a given |
| -- discriminant are found, semantic processing continues looking for |
| -- further errors. In this case it's the first discriminant value found |
| -- which we will be recorded. |
| -- |
| -- IMPORTANT NOTE: For derived tagged types this procedure expects |
| -- First_Discriminant and Next_Discriminant to give the correct list |
| -- of discriminants, in the correct order. |
| -- |
| -- 4. After all the discriminant values have been gathered, we can set the |
| -- Etype of the record aggregate. If Typ contains no discriminants this |
| -- is straightforward: the Etype of N is just Typ, otherwise a new |
| -- implicit constrained subtype of Typ is built to be the Etype of N. |
| -- |
| -- 5. Gather the remaining record components according to the discriminant |
| -- values. This involves recursively traversing the record type |
| -- structure to see what variants are selected by the given discriminant |
| -- values. This processing is a little more convoluted if Typ is a |
| -- derived tagged types since we need to retrieve the record structure |
| -- of all the ancestors of Typ. |
| -- |
| -- 6. After gathering the record components we look for their values in the |
| -- record aggregate and emit appropriate error messages should we not |
| -- find such values or should they be duplicated. |
| -- |
| -- 7. We then make sure no illegal component names appear in the record |
| -- aggregate and make sure that the type of the record components |
| -- appearing in a same choice list is the same. Finally we ensure that |
| -- the others choice, if present, is used to provide the value of at |
| -- least a record component. |
| -- |
| -- 8. The original aggregate node is replaced with the new named aggregate |
| -- built in steps 3 through 6, as explained earlier. |
| -- |
| -- Given the complexity of record aggregate resolution, the primary goal of |
| -- this routine is clarity and simplicity rather than execution and storage |
| -- efficiency. If there are only positional components in the aggregate the |
| -- running time is linear. If there are associations the running time is |
| -- still linear as long as the order of the associations is not too far off |
| -- the order of the components in the record type. If this is not the case |
| -- the running time is at worst quadratic in the size of the association |
| -- list. |
| |
| procedure Check_Misspelled_Component |
| (Elements : Elist_Id; |
| Component : Node_Id); |
| -- Give possible misspelling diagnostic if Component is likely to be a |
| -- misspelling of one of the components of the Assoc_List. This is called |
| -- by Resolve_Aggr_Expr after producing an invalid component error message. |
| |
| procedure Check_Static_Discriminated_Subtype (T : Entity_Id; V : Node_Id); |
| -- An optimization: determine whether a discriminated subtype has a static |
| -- constraint, and contains array components whose length is also static, |
| -- either because they are constrained by the discriminant, or because the |
| -- original component bounds are static. |
| |
| ----------------------------------------------------- |
| -- Subprograms used for ARRAY AGGREGATE Processing -- |
| ----------------------------------------------------- |
| |
| function Resolve_Array_Aggregate |
| (N : Node_Id; |
| Index : Node_Id; |
| Index_Constr : Node_Id; |
| Component_Typ : Entity_Id; |
| Others_Allowed : Boolean) return Boolean; |
| -- This procedure performs the semantic checks for an array aggregate. |
| -- True is returned if the aggregate resolution succeeds. |
| -- |
| -- The procedure works by recursively checking each nested aggregate. |
| -- Specifically, after checking a sub-aggregate nested at the i-th level |
| -- we recursively check all the subaggregates at the i+1-st level (if any). |
| -- Note that for aggregates analysis and resolution go hand in hand. |
| -- Aggregate analysis has been delayed up to here and it is done while |
| -- resolving the aggregate. |
| -- |
| -- N is the current N_Aggregate node to be checked. |
| -- |
| -- Index is the index node corresponding to the array sub-aggregate that |
| -- we are currently checking (RM 4.3.3 (8)). Its Etype is the |
| -- corresponding index type (or subtype). |
| -- |
| -- Index_Constr is the node giving the applicable index constraint if |
| -- any (RM 4.3.3 (10)). It "is a constraint provided by certain |
| -- contexts [...] that can be used to determine the bounds of the array |
| -- value specified by the aggregate". If Others_Allowed below is False |
| -- there is no applicable index constraint and this node is set to Index. |
| -- |
| -- Component_Typ is the array component type. |
| -- |
| -- Others_Allowed indicates whether an others choice is allowed |
| -- in the context where the top-level aggregate appeared. |
| -- |
| -- The algorithm of Resolve_Array_Aggregate proceeds as follows: |
| -- |
| -- 1. Make sure that the others choice, if present, is by itself and |
| -- appears last in the sub-aggregate. Check that we do not have |
| -- positional and named components in the array sub-aggregate (unless |
| -- the named association is an others choice). Finally if an others |
| -- choice is present, make sure it is allowed in the aggregate context. |
| -- |
| -- 2. If the array sub-aggregate contains discrete_choices: |
| -- |
| -- (A) Verify their validity. Specifically verify that: |
| -- |
| -- (a) If a null range is present it must be the only possible |
| -- choice in the array aggregate. |
| -- |
| -- (b) Ditto for a non static range. |
| -- |
| -- (c) Ditto for a non static expression. |
| -- |
| -- In addition this step analyzes and resolves each discrete_choice, |
| -- making sure that its type is the type of the corresponding Index. |
| -- If we are not at the lowest array aggregate level (in the case of |
| -- multi-dimensional aggregates) then invoke Resolve_Array_Aggregate |
| -- recursively on each component expression. Otherwise, resolve the |
| -- bottom level component expressions against the expected component |
| -- type ONLY IF the component corresponds to a single discrete choice |
| -- which is not an others choice (to see why read the DELAYED |
| -- COMPONENT RESOLUTION below). |
| -- |
| -- (B) Determine the bounds of the sub-aggregate and lowest and |
| -- highest choice values. |
| -- |
| -- 3. For positional aggregates: |
| -- |
| -- (A) Loop over the component expressions either recursively invoking |
| -- Resolve_Array_Aggregate on each of these for multi-dimensional |
| -- array aggregates or resolving the bottom level component |
| -- expressions against the expected component type. |
| -- |
| -- (B) Determine the bounds of the positional sub-aggregates. |
| -- |
| -- 4. Try to determine statically whether the evaluation of the array |
| -- sub-aggregate raises Constraint_Error. If yes emit proper |
| -- warnings. The precise checks are the following: |
| -- |
| -- (A) Check that the index range defined by aggregate bounds is |
| -- compatible with corresponding index subtype. |
| -- We also check against the base type. In fact it could be that |
| -- Low/High bounds of the base type are static whereas those of |
| -- the index subtype are not. Thus if we can statically catch |
| -- a problem with respect to the base type we are guaranteed |
| -- that the same problem will arise with the index subtype |
| -- |
| -- (B) If we are dealing with a named aggregate containing an others |
| -- choice and at least one discrete choice then make sure the range |
| -- specified by the discrete choices does not overflow the |
| -- aggregate bounds. We also check against the index type and base |
| -- type bounds for the same reasons given in (A). |
| -- |
| -- (C) If we are dealing with a positional aggregate with an others |
| -- choice make sure the number of positional elements specified |
| -- does not overflow the aggregate bounds. We also check against |
| -- the index type and base type bounds as mentioned in (A). |
| -- |
| -- Finally construct an N_Range node giving the sub-aggregate bounds. |
| -- Set the Aggregate_Bounds field of the sub-aggregate to be this |
| -- N_Range. The routine Array_Aggr_Subtype below uses such N_Ranges |
| -- to build the appropriate aggregate subtype. Aggregate_Bounds |
| -- information is needed during expansion. |
| -- |
| -- DELAYED COMPONENT RESOLUTION: The resolution of bottom level component |
| -- expressions in an array aggregate may call Duplicate_Subexpr or some |
| -- other routine that inserts code just outside the outermost aggregate. |
| -- If the array aggregate contains discrete choices or an others choice, |
| -- this may be wrong. Consider for instance the following example. |
| -- |
| -- type Rec is record |
| -- V : Integer := 0; |
| -- end record; |
| -- |
| -- type Acc_Rec is access Rec; |
| -- Arr : array (1..3) of Acc_Rec := (1 .. 3 => new Rec); |
| -- |
| -- Then the transformation of "new Rec" that occurs during resolution |
| -- entails the following code modifications |
| -- |
| -- P7b : constant Acc_Rec := new Rec; |
| -- RecIP (P7b.all); |
| -- Arr : array (1..3) of Acc_Rec := (1 .. 3 => P7b); |
| -- |
| -- This code transformation is clearly wrong, since we need to call |
| -- "new Rec" for each of the 3 array elements. To avoid this problem we |
| -- delay resolution of the components of non positional array aggregates |
| -- to the expansion phase. As an optimization, if the discrete choice |
| -- specifies a single value we do not delay resolution. |
| |
| function Array_Aggr_Subtype (N : Node_Id; Typ : Node_Id) return Entity_Id; |
| -- This routine returns the type or subtype of an array aggregate. |
| -- |
| -- N is the array aggregate node whose type we return. |
| -- |
| -- Typ is the context type in which N occurs. |
| -- |
| -- This routine creates an implicit array subtype whose bounds are |
| -- those defined by the aggregate. When this routine is invoked |
| -- Resolve_Array_Aggregate has already processed aggregate N. Thus the |
| -- Aggregate_Bounds of each sub-aggregate, is an N_Range node giving the |
| -- sub-aggregate bounds. When building the aggregate itype, this function |
| -- traverses the array aggregate N collecting such Aggregate_Bounds and |
| -- constructs the proper array aggregate itype. |
| -- |
| -- Note that in the case of multidimensional aggregates each inner |
| -- sub-aggregate corresponding to a given array dimension, may provide a |
| -- different bounds. If it is possible to determine statically that |
| -- some sub-aggregates corresponding to the same index do not have the |
| -- same bounds, then a warning is emitted. If such check is not possible |
| -- statically (because some sub-aggregate bounds are dynamic expressions) |
| -- then this job is left to the expander. In all cases the particular |
| -- bounds that this function will chose for a given dimension is the first |
| -- N_Range node for a sub-aggregate corresponding to that dimension. |
| -- |
| -- Note that the Raises_Constraint_Error flag of an array aggregate |
| -- whose evaluation is determined to raise CE by Resolve_Array_Aggregate, |
| -- is set in Resolve_Array_Aggregate but the aggregate is not |
| -- immediately replaced with a raise CE. In fact, Array_Aggr_Subtype must |
| -- first construct the proper itype for the aggregate (Gigi needs |
| -- this). After constructing the proper itype we will eventually replace |
| -- the top-level aggregate with a raise CE (done in Resolve_Aggregate). |
| -- Of course in cases such as: |
| -- |
| -- type Arr is array (integer range <>) of Integer; |
| -- A : Arr := (positive range -1 .. 2 => 0); |
| -- |
| -- The bounds of the aggregate itype are cooked up to look reasonable |
| -- (in this particular case the bounds will be 1 .. 2). |
| |
| procedure Make_String_Into_Aggregate (N : Node_Id); |
| -- A string literal can appear in a context in which a one dimensional |
| -- array of characters is expected. This procedure simply rewrites the |
| -- string as an aggregate, prior to resolution. |
| |
| --------------------------------- |
| -- Delta aggregate processing -- |
| --------------------------------- |
| |
| procedure Resolve_Delta_Array_Aggregate (N : Node_Id; Typ : Entity_Id); |
| procedure Resolve_Delta_Record_Aggregate (N : Node_Id; Typ : Entity_Id); |
| |
| ------------------------ |
| -- Array_Aggr_Subtype -- |
| ------------------------ |
| |
| function Array_Aggr_Subtype |
| (N : Node_Id; |
| Typ : Entity_Id) return Entity_Id |
| is |
| Aggr_Dimension : constant Pos := Number_Dimensions (Typ); |
| -- Number of aggregate index dimensions |
| |
| Aggr_Range : array (1 .. Aggr_Dimension) of Node_Id := (others => Empty); |
| -- Constrained N_Range of each index dimension in our aggregate itype |
| |
| Aggr_Low : array (1 .. Aggr_Dimension) of Node_Id := (others => Empty); |
| Aggr_High : array (1 .. Aggr_Dimension) of Node_Id := (others => Empty); |
| -- Low and High bounds for each index dimension in our aggregate itype |
| |
| Is_Fully_Positional : Boolean := True; |
| |
| procedure Collect_Aggr_Bounds (N : Node_Id; Dim : Pos); |
| -- N is an array (sub-)aggregate. Dim is the dimension corresponding |
| -- to (sub-)aggregate N. This procedure collects and removes the side |
| -- effects of the constrained N_Range nodes corresponding to each index |
| -- dimension of our aggregate itype. These N_Range nodes are collected |
| -- in Aggr_Range above. |
| -- |
| -- Likewise collect in Aggr_Low & Aggr_High above the low and high |
| -- bounds of each index dimension. If, when collecting, two bounds |
| -- corresponding to the same dimension are static and found to differ, |
| -- then emit a warning, and mark N as raising Constraint_Error. |
| |
| ------------------------- |
| -- Collect_Aggr_Bounds -- |
| ------------------------- |
| |
| procedure Collect_Aggr_Bounds (N : Node_Id; Dim : Pos) is |
| This_Range : constant Node_Id := Aggregate_Bounds (N); |
| -- The aggregate range node of this specific sub-aggregate |
| |
| This_Low : constant Node_Id := Low_Bound (Aggregate_Bounds (N)); |
| This_High : constant Node_Id := High_Bound (Aggregate_Bounds (N)); |
| -- The aggregate bounds of this specific sub-aggregate |
| |
| Assoc : Node_Id; |
| Expr : Node_Id; |
| |
| begin |
| Remove_Side_Effects (This_Low, Variable_Ref => True); |
| Remove_Side_Effects (This_High, Variable_Ref => True); |
| |
| -- Collect the first N_Range for a given dimension that you find. |
| -- For a given dimension they must be all equal anyway. |
| |
| if No (Aggr_Range (Dim)) then |
| Aggr_Low (Dim) := This_Low; |
| Aggr_High (Dim) := This_High; |
| Aggr_Range (Dim) := This_Range; |
| |
| else |
| if Compile_Time_Known_Value (This_Low) then |
| if not Compile_Time_Known_Value (Aggr_Low (Dim)) then |
| Aggr_Low (Dim) := This_Low; |
| |
| elsif Expr_Value (This_Low) /= Expr_Value (Aggr_Low (Dim)) then |
| Set_Raises_Constraint_Error (N); |
| Error_Msg_Warn := SPARK_Mode /= On; |
| Error_Msg_N ("sub-aggregate low bound mismatch<<", N); |
| Error_Msg_N ("\Constraint_Error [<<", N); |
| end if; |
| end if; |
| |
| if Compile_Time_Known_Value (This_High) then |
| if not Compile_Time_Known_Value (Aggr_High (Dim)) then |
| Aggr_High (Dim) := This_High; |
| |
| elsif |
| Expr_Value (This_High) /= Expr_Value (Aggr_High (Dim)) |
| then |
| Set_Raises_Constraint_Error (N); |
| Error_Msg_Warn := SPARK_Mode /= On; |
| Error_Msg_N ("sub-aggregate high bound mismatch<<", N); |
| Error_Msg_N ("\Constraint_Error [<<", N); |
| end if; |
| end if; |
| end if; |
| |
| if Dim < Aggr_Dimension then |
| |
| -- Process positional components |
| |
| if Present (Expressions (N)) then |
| Expr := First (Expressions (N)); |
| while Present (Expr) loop |
| Collect_Aggr_Bounds (Expr, Dim + 1); |
| Next (Expr); |
| end loop; |
| end if; |
| |
| -- Process component associations |
| |
| if Present (Component_Associations (N)) then |
| Is_Fully_Positional := False; |
| |
| Assoc := First (Component_Associations (N)); |
| while Present (Assoc) loop |
| Expr := Expression (Assoc); |
| Collect_Aggr_Bounds (Expr, Dim + 1); |
| Next (Assoc); |
| end loop; |
| end if; |
| end if; |
| end Collect_Aggr_Bounds; |
| |
| -- Array_Aggr_Subtype variables |
| |
| Itype : Entity_Id; |
| -- The final itype of the overall aggregate |
| |
| Index_Constraints : constant List_Id := New_List; |
| -- The list of index constraints of the aggregate itype |
| |
| -- Start of processing for Array_Aggr_Subtype |
| |
| begin |
| -- Make sure that the list of index constraints is properly attached to |
| -- the tree, and then collect the aggregate bounds. |
| |
| Set_Parent (Index_Constraints, N); |
| Collect_Aggr_Bounds (N, 1); |
| |
| -- Build the list of constrained indexes of our aggregate itype |
| |
| for J in 1 .. Aggr_Dimension loop |
| Create_Index : declare |
| Index_Base : constant Entity_Id := |
| Base_Type (Etype (Aggr_Range (J))); |
| Index_Typ : Entity_Id; |
| |
| begin |
| -- Construct the Index subtype, and associate it with the range |
| -- construct that generates it. |
| |
| Index_Typ := |
| Create_Itype (Subtype_Kind (Ekind (Index_Base)), Aggr_Range (J)); |
| |
| Set_Etype (Index_Typ, Index_Base); |
| |
| if Is_Character_Type (Index_Base) then |
| Set_Is_Character_Type (Index_Typ); |
| end if; |
| |
| Set_Size_Info (Index_Typ, (Index_Base)); |
| Set_RM_Size (Index_Typ, RM_Size (Index_Base)); |
| Set_First_Rep_Item (Index_Typ, First_Rep_Item (Index_Base)); |
| Set_Scalar_Range (Index_Typ, Aggr_Range (J)); |
| |
| if Is_Discrete_Or_Fixed_Point_Type (Index_Typ) then |
| Set_RM_Size (Index_Typ, UI_From_Int (Minimum_Size (Index_Typ))); |
| end if; |
| |
| Set_Etype (Aggr_Range (J), Index_Typ); |
| |
| Append (Aggr_Range (J), To => Index_Constraints); |
| end Create_Index; |
| end loop; |
| |
| -- Now build the Itype |
| |
| Itype := Create_Itype (E_Array_Subtype, N); |
| |
| Set_First_Rep_Item (Itype, First_Rep_Item (Typ)); |
| Set_Convention (Itype, Convention (Typ)); |
| Set_Depends_On_Private (Itype, Has_Private_Component (Typ)); |
| Set_Etype (Itype, Base_Type (Typ)); |
| Set_Has_Alignment_Clause (Itype, Has_Alignment_Clause (Typ)); |
| Set_Is_Aliased (Itype, Is_Aliased (Typ)); |
| Set_Depends_On_Private (Itype, Depends_On_Private (Typ)); |
| |
| Copy_Suppress_Status (Index_Check, Typ, Itype); |
| Copy_Suppress_Status (Length_Check, Typ, Itype); |
| |
| Set_First_Index (Itype, First (Index_Constraints)); |
| Set_Is_Constrained (Itype, True); |
| Set_Is_Internal (Itype, True); |
| |
| if Has_Predicates (Typ) then |
| Set_Has_Predicates (Itype); |
| |
| if Present (Predicate_Function (Typ)) then |
| Set_Predicate_Function (Itype, Predicate_Function (Typ)); |
| else |
| Set_Predicated_Parent (Itype, Predicated_Parent (Typ)); |
| end if; |
| end if; |
| |
| -- A simple optimization: purely positional aggregates of static |
| -- components should be passed to gigi unexpanded whenever possible, and |
| -- regardless of the staticness of the bounds themselves. Subsequent |
| -- checks in exp_aggr verify that type is not packed, etc. |
| |
| Set_Size_Known_At_Compile_Time |
| (Itype, |
| Is_Fully_Positional |
| and then Comes_From_Source (N) |
| and then Size_Known_At_Compile_Time (Component_Type (Typ))); |
| |
| -- We always need a freeze node for a packed array subtype, so that we |
| -- can build the Packed_Array_Impl_Type corresponding to the subtype. If |
| -- expansion is disabled, the packed array subtype is not built, and we |
| -- must not generate a freeze node for the type, or else it will appear |
| -- incomplete to gigi. |
| |
| if Is_Packed (Itype) |
| and then not In_Spec_Expression |
| and then Expander_Active |
| then |
| Freeze_Itype (Itype, N); |
| end if; |
| |
| return Itype; |
| end Array_Aggr_Subtype; |
| |
| -------------------------------- |
| -- Check_Misspelled_Component -- |
| -------------------------------- |
| |
| procedure Check_Misspelled_Component |
| (Elements : Elist_Id; |
| Component : Node_Id) |
| is |
| Max_Suggestions : constant := 2; |
| |
| Nr_Of_Suggestions : Natural := 0; |
| Suggestion_1 : Entity_Id := Empty; |
| Suggestion_2 : Entity_Id := Empty; |
| Component_Elmt : Elmt_Id; |
| |
| begin |
| -- All the components of List are matched against Component and a count |
| -- is maintained of possible misspellings. When at the end of the |
| -- analysis there are one or two (not more) possible misspellings, |
| -- these misspellings will be suggested as possible corrections. |
| |
| Component_Elmt := First_Elmt (Elements); |
| while Nr_Of_Suggestions <= Max_Suggestions |
| and then Present (Component_Elmt) |
| loop |
| if Is_Bad_Spelling_Of |
| (Chars (Node (Component_Elmt)), |
| Chars (Component)) |
| then |
| Nr_Of_Suggestions := Nr_Of_Suggestions + 1; |
| |
| case Nr_Of_Suggestions is |
| when 1 => Suggestion_1 := Node (Component_Elmt); |
| when 2 => Suggestion_2 := Node (Component_Elmt); |
| when others => null; |
| end case; |
| end if; |
| |
| Next_Elmt (Component_Elmt); |
| end loop; |
| |
| -- Report at most two suggestions |
| |
| if Nr_Of_Suggestions = 1 then |
| Error_Msg_NE -- CODEFIX |
| ("\possible misspelling of&", Component, Suggestion_1); |
| |
| elsif Nr_Of_Suggestions = 2 then |
| Error_Msg_Node_2 := Suggestion_2; |
| Error_Msg_NE -- CODEFIX |
| ("\possible misspelling of& or&", Component, Suggestion_1); |
| end if; |
| end Check_Misspelled_Component; |
| |
| ---------------------------------------- |
| -- Check_Expr_OK_In_Limited_Aggregate -- |
| ---------------------------------------- |
| |
| procedure Check_Expr_OK_In_Limited_Aggregate (Expr : Node_Id) is |
| begin |
| if Is_Limited_Type (Etype (Expr)) |
| and then Comes_From_Source (Expr) |
| then |
| if In_Instance_Body or else In_Inlined_Body then |
| null; |
| |
| elsif not OK_For_Limited_Init (Etype (Expr), Expr) then |
| Error_Msg_N |
| ("initialization not allowed for limited types", Expr); |
| Explain_Limited_Type (Etype (Expr), Expr); |
| end if; |
| end if; |
| end Check_Expr_OK_In_Limited_Aggregate; |
| |
| ------------------------------- |
| -- Check_Qualified_Aggregate -- |
| ------------------------------- |
| |
| procedure Check_Qualified_Aggregate (Level : Nat; Expr : Node_Id) is |
| Comp_Expr : Node_Id; |
| Comp_Assn : Node_Id; |
| |
| begin |
| if Level = 0 then |
| if Nkind (Parent (Expr)) /= N_Qualified_Expression then |
| Check_SPARK_05_Restriction ("aggregate should be qualified", Expr); |
| end if; |
| |
| else |
| Comp_Expr := First (Expressions (Expr)); |
| while Present (Comp_Expr) loop |
| if Nkind (Comp_Expr) = N_Aggregate then |
| Check_Qualified_Aggregate (Level - 1, Comp_Expr); |
| end if; |
| |
| Comp_Expr := Next (Comp_Expr); |
| end loop; |
| |
| Comp_Assn := First (Component_Associations (Expr)); |
| while Present (Comp_Assn) loop |
| Comp_Expr := Expression (Comp_Assn); |
| |
| if Nkind (Comp_Expr) = N_Aggregate then |
| Check_Qualified_Aggregate (Level - 1, Comp_Expr); |
| end if; |
| |
| Comp_Assn := Next (Comp_Assn); |
| end loop; |
| end if; |
| end Check_Qualified_Aggregate; |
| |
| ---------------------------------------- |
| -- Check_Static_Discriminated_Subtype -- |
| ---------------------------------------- |
| |
| procedure Check_Static_Discriminated_Subtype (T : Entity_Id; V : Node_Id) is |
| Disc : constant Entity_Id := First_Discriminant (T); |
| Comp : Entity_Id; |
| Ind : Entity_Id; |
| |
| begin |
| if Has_Record_Rep_Clause (T) then |
| return; |
| |
| elsif Present (Next_Discriminant (Disc)) then |
| return; |
| |
| elsif Nkind (V) /= N_Integer_Literal then |
| return; |
| end if; |
| |
| Comp := First_Component (T); |
| while Present (Comp) loop |
| if Is_Scalar_Type (Etype (Comp)) then |
| null; |
| |
| elsif Is_Private_Type (Etype (Comp)) |
| and then Present (Full_View (Etype (Comp))) |
| and then Is_Scalar_Type (Full_View (Etype (Comp))) |
| then |
| null; |
| |
| elsif Is_Array_Type (Etype (Comp)) then |
| if Is_Bit_Packed_Array (Etype (Comp)) then |
| return; |
| end if; |
| |
| Ind := First_Index (Etype (Comp)); |
| while Present (Ind) loop |
| if Nkind (Ind) /= N_Range |
| or else Nkind (Low_Bound (Ind)) /= N_Integer_Literal |
| or else Nkind (High_Bound (Ind)) /= N_Integer_Literal |
| then |
| return; |
| end if; |
| |
| Next_Index (Ind); |
| end loop; |
| |
| else |
| return; |
| end if; |
| |
| Next_Component (Comp); |
| end loop; |
| |
| -- On exit, all components have statically known sizes |
| |
| Set_Size_Known_At_Compile_Time (T); |
| end Check_Static_Discriminated_Subtype; |
| |
| ------------------------- |
| -- Is_Others_Aggregate -- |
| ------------------------- |
| |
| function Is_Others_Aggregate (Aggr : Node_Id) return Boolean is |
| begin |
| return No (Expressions (Aggr)) |
| and then |
| Nkind (First (Choice_List (First (Component_Associations (Aggr))))) = |
| N_Others_Choice; |
| end Is_Others_Aggregate; |
| |
| ---------------------------- |
| -- Is_Top_Level_Aggregate -- |
| ---------------------------- |
| |
| function Is_Top_Level_Aggregate (Expr : Node_Id) return Boolean is |
| begin |
| return Nkind (Parent (Expr)) /= N_Aggregate |
| and then (Nkind (Parent (Expr)) /= N_Component_Association |
| or else Nkind (Parent (Parent (Expr))) /= N_Aggregate); |
| end Is_Top_Level_Aggregate; |
| |
| -------------------------------- |
| -- Make_String_Into_Aggregate -- |
| -------------------------------- |
| |
| procedure Make_String_Into_Aggregate (N : Node_Id) is |
| Exprs : constant List_Id := New_List; |
| Loc : constant Source_Ptr := Sloc (N); |
| Str : constant String_Id := Strval (N); |
| Strlen : constant Nat := String_Length (Str); |
| C : Char_Code; |
| C_Node : Node_Id; |
| New_N : Node_Id; |
| P : Source_Ptr; |
| |
| begin |
| P := Loc + 1; |
| for J in 1 .. Strlen loop |
| C := Get_String_Char (Str, J); |
| Set_Character_Literal_Name (C); |
| |
| C_Node := |
| Make_Character_Literal (P, |
| Chars => Name_Find, |
| Char_Literal_Value => UI_From_CC (C)); |
| Set_Etype (C_Node, Any_Character); |
| Append_To (Exprs, C_Node); |
| |
| P := P + 1; |
| -- Something special for wide strings??? |
| end loop; |
| |
| New_N := Make_Aggregate (Loc, Expressions => Exprs); |
| Set_Analyzed (New_N); |
| Set_Etype (New_N, Any_Composite); |
| |
| Rewrite (N, New_N); |
| end Make_String_Into_Aggregate; |
| |
| ----------------------- |
| -- Resolve_Aggregate -- |
| ----------------------- |
| |
| procedure Resolve_Aggregate (N : Node_Id; Typ : Entity_Id) is |
| Loc : constant Source_Ptr := Sloc (N); |
| Pkind : constant Node_Kind := Nkind (Parent (N)); |
| |
| Aggr_Subtyp : Entity_Id; |
| -- The actual aggregate subtype. This is not necessarily the same as Typ |
| -- which is the subtype of the context in which the aggregate was found. |
| |
| begin |
| -- Ignore junk empty aggregate resulting from parser error |
| |
| if No (Expressions (N)) |
| and then No (Component_Associations (N)) |
| and then not Null_Record_Present (N) |
| then |
| return; |
| end if; |
| |
| -- If the aggregate has box-initialized components, its type must be |
| -- frozen so that initialization procedures can properly be called |
| -- in the resolution that follows. The replacement of boxes with |
| -- initialization calls is properly an expansion activity but it must |
| -- be done during resolution. |
| |
| if Expander_Active |
| and then Present (Component_Associations (N)) |
| then |
| declare |
| Comp : Node_Id; |
| |
| begin |
| Comp := First (Component_Associations (N)); |
| while Present (Comp) loop |
| if Box_Present (Comp) then |
| Insert_Actions (N, Freeze_Entity (Typ, N)); |
| exit; |
| end if; |
| |
| Next (Comp); |
| end loop; |
| end; |
| end if; |
| |
| -- An unqualified aggregate is restricted in SPARK to: |
| |
| -- An aggregate item inside an aggregate for a multi-dimensional array |
| |
| -- An expression being assigned to an unconstrained array, but only if |
| -- the aggregate specifies a value for OTHERS only. |
| |
| if Nkind (Parent (N)) = N_Qualified_Expression then |
| if Is_Array_Type (Typ) then |
| Check_Qualified_Aggregate (Number_Dimensions (Typ), N); |
| else |
| Check_Qualified_Aggregate (1, N); |
| end if; |
| else |
| if Is_Array_Type (Typ) |
| and then Nkind (Parent (N)) = N_Assignment_Statement |
| and then not Is_Constrained (Etype (Name (Parent (N)))) |
| then |
| if not Is_Others_Aggregate (N) then |
| Check_SPARK_05_Restriction |
| ("array aggregate should have only OTHERS", N); |
| end if; |
| |
| elsif Is_Top_Level_Aggregate (N) then |
| Check_SPARK_05_Restriction ("aggregate should be qualified", N); |
| |
| -- The legality of this unqualified aggregate is checked by calling |
| -- Check_Qualified_Aggregate from one of its enclosing aggregate, |
| -- unless one of these already causes an error to be issued. |
| |
| else |
| null; |
| end if; |
| end if; |
| |
| -- Check for aggregates not allowed in configurable run-time mode. |
| -- We allow all cases of aggregates that do not come from source, since |
| -- these are all assumed to be small (e.g. bounds of a string literal). |
| -- We also allow aggregates of types we know to be small. |
| |
| if not Support_Aggregates_On_Target |
| and then Comes_From_Source (N) |
| and then (not Known_Static_Esize (Typ) or else Esize (Typ) > 64) |
| then |
| Error_Msg_CRT ("aggregate", N); |
| end if; |
| |
| -- Ada 2005 (AI-287): Limited aggregates allowed |
| |
| -- In an instance, ignore aggregate subcomponents tnat may be limited, |
| -- because they originate in view conflicts. If the original aggregate |
| -- is legal and the actuals are legal, the aggregate itself is legal. |
| |
| if Is_Limited_Type (Typ) |
| and then Ada_Version < Ada_2005 |
| and then not In_Instance |
| then |
| Error_Msg_N ("aggregate type cannot be limited", N); |
| Explain_Limited_Type (Typ, N); |
| |
| elsif Is_Class_Wide_Type (Typ) then |
| Error_Msg_N ("type of aggregate cannot be class-wide", N); |
| |
| elsif Typ = Any_String |
| or else Typ = Any_Composite |
| then |
| Error_Msg_N ("no unique type for aggregate", N); |
| Set_Etype (N, Any_Composite); |
| |
| elsif Is_Array_Type (Typ) and then Null_Record_Present (N) then |
| Error_Msg_N ("null record forbidden in array aggregate", N); |
| |
| elsif Is_Record_Type (Typ) then |
| Resolve_Record_Aggregate (N, Typ); |
| |
| elsif Is_Array_Type (Typ) then |
| |
| -- First a special test, for the case of a positional aggregate of |
| -- characters which can be replaced by a string literal. |
| |
| -- Do not perform this transformation if this was a string literal |
| -- to start with, whose components needed constraint checks, or if |
| -- the component type is non-static, because it will require those |
| -- checks and be transformed back into an aggregate. If the index |
| -- type is not Integer the aggregate may represent a user-defined |
| -- string type but the context might need the original type so we |
| -- do not perform the transformation at this point. |
| |
| if Number_Dimensions (Typ) = 1 |
| and then Is_Standard_Character_Type (Component_Type (Typ)) |
| and then No (Component_Associations (N)) |
| and then not Is_Limited_Composite (Typ) |
| and then not Is_Private_Composite (Typ) |
| and then not Is_Bit_Packed_Array (Typ) |
| and then Nkind (Original_Node (Parent (N))) /= N_String_Literal |
| and then Is_OK_Static_Subtype (Component_Type (Typ)) |
| and then Base_Type (Etype (First_Index (Typ))) = |
| Base_Type (Standard_Integer) |
| then |
| declare |
| Expr : Node_Id; |
| |
| begin |
| Expr := First (Expressions (N)); |
| while Present (Expr) loop |
| exit when Nkind (Expr) /= N_Character_Literal; |
| Next (Expr); |
| end loop; |
| |
| if No (Expr) then |
| Start_String; |
| |
| Expr := First (Expressions (N)); |
| while Present (Expr) loop |
| Store_String_Char (UI_To_CC (Char_Literal_Value (Expr))); |
| Next (Expr); |
| end loop; |
| |
| Rewrite (N, Make_String_Literal (Loc, End_String)); |
| |
| Analyze_And_Resolve (N, Typ); |
| return; |
| end if; |
| end; |
| end if; |
| |
| -- Here if we have a real aggregate to deal with |
| |
| Array_Aggregate : declare |
| Aggr_Resolved : Boolean; |
| |
| Aggr_Typ : constant Entity_Id := Etype (Typ); |
| -- This is the unconstrained array type, which is the type against |
| -- which the aggregate is to be resolved. Typ itself is the array |
| -- type of the context which may not be the same subtype as the |
| -- subtype for the final aggregate. |
| |
| begin |
| -- In the following we determine whether an OTHERS choice is |
| -- allowed inside the array aggregate. The test checks the context |
| -- in which the array aggregate occurs. If the context does not |
| -- permit it, or the aggregate type is unconstrained, an OTHERS |
| -- choice is not allowed (except that it is always allowed on the |
| -- right-hand side of an assignment statement; in this case the |
| -- constrainedness of the type doesn't matter). |
| |
| -- If expansion is disabled (generic context, or semantics-only |
| -- mode) actual subtypes cannot be constructed, and the type of an |
| -- object may be its unconstrained nominal type. However, if the |
| -- context is an assignment, we assume that OTHERS is allowed, |
| -- because the target of the assignment will have a constrained |
| -- subtype when fully compiled. Ditto if the context is an |
| -- initialization procedure where a component may have a predicate |
| -- function that carries the base type. |
| |
| -- Note that there is no node for Explicit_Actual_Parameter. |
| -- To test for this context we therefore have to test for node |
| -- N_Parameter_Association which itself appears only if there is a |
| -- formal parameter. Consequently we also need to test for |
| -- N_Procedure_Call_Statement or N_Function_Call. |
| |
| -- The context may be an N_Reference node, created by expansion. |
| -- Legality of the others clause was established in the source, |
| -- so the context is legal. |
| |
| Set_Etype (N, Aggr_Typ); -- May be overridden later on |
| |
| if Pkind = N_Assignment_Statement |
| or else Inside_Init_Proc |
| or else (Is_Constrained (Typ) |
| and then |
| (Pkind = N_Parameter_Association or else |
| Pkind = N_Function_Call or else |
| Pkind = N_Procedure_Call_Statement or else |
| Pkind = N_Generic_Association or else |
| Pkind = N_Formal_Object_Declaration or else |
| Pkind = N_Simple_Return_Statement or else |
| Pkind = N_Object_Declaration or else |
| Pkind = N_Component_Declaration or else |
| Pkind = N_Parameter_Specification or else |
| Pkind = N_Qualified_Expression or else |
| Pkind = N_Reference or else |
| Pkind = N_Aggregate or else |
| Pkind = N_Extension_Aggregate or else |
| Pkind = N_Component_Association)) |
| then |
| Aggr_Resolved := |
| Resolve_Array_Aggregate |
| (N, |
| Index => First_Index (Aggr_Typ), |
| Index_Constr => First_Index (Typ), |
| Component_Typ => Component_Type (Typ), |
| Others_Allowed => True); |
| else |
| Aggr_Resolved := |
| Resolve_Array_Aggregate |
| (N, |
| Index => First_Index (Aggr_Typ), |
| Index_Constr => First_Index (Aggr_Typ), |
| Component_Typ => Component_Type (Typ), |
| Others_Allowed => False); |
| end if; |
| |
| if not Aggr_Resolved then |
| |
| -- A parenthesized expression may have been intended as an |
| -- aggregate, leading to a type error when analyzing the |
| -- component. This can also happen for a nested component |
| -- (see Analyze_Aggr_Expr). |
| |
| if Paren_Count (N) > 0 then |
| Error_Msg_N |
| ("positional aggregate cannot have one component", N); |
| end if; |
| |
| Aggr_Subtyp := Any_Composite; |
| |
| else |
| Aggr_Subtyp := Array_Aggr_Subtype (N, Typ); |
| end if; |
| |
| Set_Etype (N, Aggr_Subtyp); |
| end Array_Aggregate; |
| |
| elsif Is_Private_Type (Typ) |
| and then Present (Full_View (Typ)) |
| and then (In_Inlined_Body or In_Instance_Body) |
| and then Is_Composite_Type (Full_View (Typ)) |
| then |
| Resolve (N, Full_View (Typ)); |
| |
| else |
| Error_Msg_N ("illegal context for aggregate", N); |
| end if; |
| |
| -- If we can determine statically that the evaluation of the aggregate |
| -- raises Constraint_Error, then replace the aggregate with an |
| -- N_Raise_Constraint_Error node, but set the Etype to the right |
| -- aggregate subtype. Gigi needs this. |
| |
| if Raises_Constraint_Error (N) then |
| Aggr_Subtyp := Etype (N); |
| Rewrite (N, |
| Make_Raise_Constraint_Error (Loc, Reason => CE_Range_Check_Failed)); |
| Set_Raises_Constraint_Error (N); |
| Set_Etype (N, Aggr_Subtyp); |
| Set_Analyzed (N); |
| end if; |
| |
| Check_Function_Writable_Actuals (N); |
| end Resolve_Aggregate; |
| |
| ----------------------------- |
| -- Resolve_Array_Aggregate -- |
| ----------------------------- |
| |
| function Resolve_Array_Aggregate |
| (N : Node_Id; |
| Index : Node_Id; |
| Index_Constr : Node_Id; |
| Component_Typ : Entity_Id; |
| Others_Allowed : Boolean) return Boolean |
| is |
| Loc : constant Source_Ptr := Sloc (N); |
| |
| Failure : constant Boolean := False; |
| Success : constant Boolean := True; |
| |
| Index_Typ : constant Entity_Id := Etype (Index); |
| Index_Typ_Low : constant Node_Id := Type_Low_Bound (Index_Typ); |
| Index_Typ_High : constant Node_Id := Type_High_Bound (Index_Typ); |
| -- The type of the index corresponding to the array sub-aggregate along |
| -- with its low and upper bounds. |
| |
| Index_Base : constant Entity_Id := Base_Type (Index_Typ); |
| Index_Base_Low : constant Node_Id := Type_Low_Bound (Index_Base); |
| Index_Base_High : constant Node_Id := Type_High_Bound (Index_Base); |
| -- Ditto for the base type |
| |
| Others_Present : Boolean := False; |
| |
| Nb_Choices : Nat := 0; |
| -- Contains the overall number of named choices in this sub-aggregate |
| |
| function Add (Val : Uint; To : Node_Id) return Node_Id; |
| -- Creates a new expression node where Val is added to expression To. |
| -- Tries to constant fold whenever possible. To must be an already |
| -- analyzed expression. |
| |
| procedure Check_Bound (BH : Node_Id; AH : in out Node_Id); |
| -- Checks that AH (the upper bound of an array aggregate) is less than |
| -- or equal to BH (the upper bound of the index base type). If the check |
| -- fails, a warning is emitted, the Raises_Constraint_Error flag of N is |
| -- set, and AH is replaced with a duplicate of BH. |
| |
| procedure Check_Bounds (L, H : Node_Id; AL, AH : Node_Id); |
| -- Checks that range AL .. AH is compatible with range L .. H. Emits a |
| -- warning if not and sets the Raises_Constraint_Error flag in N. |
| |
| procedure Check_Length (L, H : Node_Id; Len : Uint); |
| -- Checks that range L .. H contains at least Len elements. Emits a |
| -- warning if not and sets the Raises_Constraint_Error flag in N. |
| |
| function Dynamic_Or_Null_Range (L, H : Node_Id) return Boolean; |
| -- Returns True if range L .. H is dynamic or null |
| |
| procedure Get (Value : out Uint; From : Node_Id; OK : out Boolean); |
| -- Given expression node From, this routine sets OK to False if it |
| -- cannot statically evaluate From. Otherwise it stores this static |
| -- value into Value. |
| |
| function Resolve_Aggr_Expr |
| (Expr : Node_Id; |
| Single_Elmt : Boolean) return Boolean; |
| -- Resolves aggregate expression Expr. Returns False if resolution |
| -- fails. If Single_Elmt is set to False, the expression Expr may be |
| -- used to initialize several array aggregate elements (this can happen |
| -- for discrete choices such as "L .. H => Expr" or the OTHERS choice). |
| -- In this event we do not resolve Expr unless expansion is disabled. |
| -- To know why, see the DELAYED COMPONENT RESOLUTION note above. |
| -- |
| -- NOTE: In the case of "... => <>", we pass the in the |
| -- N_Component_Association node as Expr, since there is no Expression in |
| -- that case, and we need a Sloc for the error message. |
| |
| procedure Resolve_Iterated_Component_Association |
| (N : Node_Id; |
| Index_Typ : Entity_Id); |
| -- For AI12-061 |
| |
| --------- |
| -- Add -- |
| --------- |
| |
| function Add (Val : Uint; To : Node_Id) return Node_Id is |
| Expr_Pos : Node_Id; |
| Expr : Node_Id; |
| To_Pos : Node_Id; |
| |
| begin |
| if Raises_Constraint_Error (To) then |
| return To; |
| end if; |
| |
| -- First test if we can do constant folding |
| |
| if Compile_Time_Known_Value (To) |
| or else Nkind (To) = N_Integer_Literal |
| then |
| Expr_Pos := Make_Integer_Literal (Loc, Expr_Value (To) + Val); |
| Set_Is_Static_Expression (Expr_Pos); |
| Set_Etype (Expr_Pos, Etype (To)); |
| Set_Analyzed (Expr_Pos, Analyzed (To)); |
| |
| if not Is_Enumeration_Type (Index_Typ) then |
| Expr := Expr_Pos; |
| |
| -- If we are dealing with enumeration return |
| -- Index_Typ'Val (Expr_Pos) |
| |
| else |
| Expr := |
| Make_Attribute_Reference |
| (Loc, |
| Prefix => New_Occurrence_Of (Index_Typ, Loc), |
| Attribute_Name => Name_Val, |
| Expressions => New_List (Expr_Pos)); |
| end if; |
| |
| return Expr; |
| end if; |
| |
| -- If we are here no constant folding possible |
| |
| if not Is_Enumeration_Type (Index_Base) then |
| Expr := |
| Make_Op_Add (Loc, |
| Left_Opnd => Duplicate_Subexpr (To), |
| Right_Opnd => Make_Integer_Literal (Loc, Val)); |
| |
| -- If we are dealing with enumeration return |
| -- Index_Typ'Val (Index_Typ'Pos (To) + Val) |
| |
| else |
| To_Pos := |
| Make_Attribute_Reference |
| (Loc, |
| Prefix => New_Occurrence_Of (Index_Typ, Loc), |
| Attribute_Name => Name_Pos, |
| Expressions => New_List (Duplicate_Subexpr (To))); |
| |
| Expr_Pos := |
| Make_Op_Add (Loc, |
| Left_Opnd => To_Pos, |
| Right_Opnd => Make_Integer_Literal (Loc, Val)); |
| |
| Expr := |
| Make_Attribute_Reference |
| (Loc, |
| Prefix => New_Occurrence_Of (Index_Typ, Loc), |
| Attribute_Name => Name_Val, |
| Expressions => New_List (Expr_Pos)); |
| |
| -- If the index type has a non standard representation, the |
| -- attributes 'Val and 'Pos expand into function calls and the |
| -- resulting expression is considered non-safe for reevaluation |
| -- by the backend. Relocate it into a constant temporary in order |
| -- to make it safe for reevaluation. |
| |
| if Has_Non_Standard_Rep (Etype (N)) then |
| declare |
| Def_Id : Entity_Id; |
| |
| begin |
| Def_Id := Make_Temporary (Loc, 'R', Expr); |
| Set_Etype (Def_Id, Index_Typ); |
| Insert_Action (N, |
| Make_Object_Declaration (Loc, |
| Defining_Identifier => Def_Id, |
| Object_Definition => |
| New_Occurrence_Of (Index_Typ, Loc), |
| Constant_Present => True, |
| Expression => Relocate_Node (Expr))); |
| |
| Expr := New_Occurrence_Of (Def_Id, Loc); |
| end; |
| end if; |
| end if; |
| |
| return Expr; |
| end Add; |
| |
| ----------------- |
| -- Check_Bound -- |
| ----------------- |
| |
| procedure Check_Bound (BH : Node_Id; AH : in out Node_Id) is |
| Val_BH : Uint; |
| Val_AH : Uint; |
| |
| OK_BH : Boolean; |
| OK_AH : Boolean; |
| |
| begin |
| Get (Value => Val_BH, From => BH, OK => OK_BH); |
| Get (Value => Val_AH, From => AH, OK => OK_AH); |
| |
| if OK_BH and then OK_AH and then Val_BH < Val_AH then |
| Set_Raises_Constraint_Error (N); |
| Error_Msg_Warn := SPARK_Mode /= On; |
| Error_Msg_N ("upper bound out of range<<", AH); |
| Error_Msg_N ("\Constraint_Error [<<", AH); |
| |
| -- You need to set AH to BH or else in the case of enumerations |
| -- indexes we will not be able to resolve the aggregate bounds. |
| |
| AH := Duplicate_Subexpr (BH); |
| end if; |
| end Check_Bound; |
| |
| ------------------ |
| -- Check_Bounds -- |
| ------------------ |
| |
| procedure Check_Bounds (L, H : Node_Id; AL, AH : Node_Id) is |
| Val_L : Uint; |
| Val_H : Uint; |
| Val_AL : Uint; |
| Val_AH : Uint; |
| |
| OK_L : Boolean; |
| OK_H : Boolean; |
| |
| OK_AL : Boolean; |
| OK_AH : Boolean; |
| pragma Warnings (Off, OK_AL); |
| pragma Warnings (Off, OK_AH); |
| |
| begin |
| if Raises_Constraint_Error (N) |
| or else Dynamic_Or_Null_Range (AL, AH) |
| then |
| return; |
| end if; |
| |
| Get (Value => Val_L, From => L, OK => OK_L); |
| Get (Value => Val_H, From => H, OK => OK_H); |
| |
| Get (Value => Val_AL, From => AL, OK => OK_AL); |
| Get (Value => Val_AH, From => AH, OK => OK_AH); |
| |
| if OK_L and then Val_L > Val_AL then |
| Set_Raises_Constraint_Error (N); |
| Error_Msg_Warn := SPARK_Mode /= On; |
| Error_Msg_N ("lower bound of aggregate out of range<<", N); |
| Error_Msg_N ("\Constraint_Error [<<", N); |
| end if; |
| |
| if OK_H and then Val_H < Val_AH then |
| Set_Raises_Constraint_Error (N); |
| Error_Msg_Warn := SPARK_Mode /= On; |
| Error_Msg_N ("upper bound of aggregate out of range<<", N); |
| Error_Msg_N ("\Constraint_Error [<<", N); |
| end if; |
| end Check_Bounds; |
| |
| ------------------ |
| -- Check_Length -- |
| ------------------ |
| |
| procedure Check_Length (L, H : Node_Id; Len : Uint) is |
| Val_L : Uint; |
| Val_H : Uint; |
| |
| OK_L : Boolean; |
| OK_H : Boolean; |
| |
| Range_Len : Uint; |
| |
| begin |
| if Raises_Constraint_Error (N) then |
| return; |
| end if; |
| |
| Get (Value => Val_L, From => L, OK => OK_L); |
| Get (Value => Val_H, From => H, OK => OK_H); |
| |
| if not OK_L or else not OK_H then |
| return; |
| end if; |
| |
| -- If null range length is zero |
| |
| if Val_L > Val_H then |
| Range_Len := Uint_0; |
| else |
| Range_Len := Val_H - Val_L + 1; |
| end if; |
| |
| if Range_Len < Len then |
| Set_Raises_Constraint_Error (N); |
| Error_Msg_Warn := SPARK_Mode /= On; |
| Error_Msg_N ("too many elements<<", N); |
| Error_Msg_N ("\Constraint_Error [<<", N); |
| end if; |
| end Check_Length; |
| |
| --------------------------- |
| -- Dynamic_Or_Null_Range -- |
| --------------------------- |
| |
| function Dynamic_Or_Null_Range (L, H : Node_Id) return Boolean is |
| Val_L : Uint; |
| Val_H : Uint; |
| |
| OK_L : Boolean; |
| OK_H : Boolean; |
| |
| begin |
| Get (Value => Val_L, From => L, OK => OK_L); |
| Get (Value => Val_H, From => H, OK => OK_H); |
| |
| return not OK_L or else not OK_H |
| or else not Is_OK_Static_Expression (L) |
| or else not Is_OK_Static_Expression (H) |
| or else Val_L > Val_H; |
| end Dynamic_Or_Null_Range; |
| |
| --------- |
| -- Get -- |
| --------- |
| |
| procedure Get (Value : out Uint; From : Node_Id; OK : out Boolean) is |
| begin |
| OK := True; |
| |
| if Compile_Time_Known_Value (From) then |
| Value := Expr_Value (From); |
| |
| -- If expression From is something like Some_Type'Val (10) then |
| -- Value = 10. |
| |
| elsif Nkind (From) = N_Attribute_Reference |
| and then Attribute_Name (From) = Name_Val |
| and then Compile_Time_Known_Value (First (Expressions (From))) |
| then |
| Value := Expr_Value (First (Expressions (From))); |
| else |
| Value := Uint_0; |
| OK := False; |
| end if; |
| end Get; |
| |
| ----------------------- |
| -- Resolve_Aggr_Expr -- |
| ----------------------- |
| |
| function Resolve_Aggr_Expr |
| (Expr : Node_Id; |
| Single_Elmt : Boolean) return Boolean |
| is |
| Nxt_Ind : constant Node_Id := Next_Index (Index); |
| Nxt_Ind_Constr : constant Node_Id := Next_Index (Index_Constr); |
| -- Index is the current index corresponding to the expression |
| |
| Resolution_OK : Boolean := True; |
| -- Set to False if resolution of the expression failed |
| |
| begin |
| -- Defend against previous errors |
| |
| if Nkind (Expr) = N_Error |
| or else Error_Posted (Expr) |
| then |
| return True; |
| end if; |
| |
| -- If the array type against which we are resolving the aggregate |
| -- has several dimensions, the expressions nested inside the |
| -- aggregate must be further aggregates (or strings). |
| |
| if Present (Nxt_Ind) then |
| if Nkind (Expr) /= N_Aggregate then |
| |
| -- A string literal can appear where a one-dimensional array |
| -- of characters is expected. If the literal looks like an |
| -- operator, it is still an operator symbol, which will be |
| -- transformed into a string when analyzed. |
| |
| if Is_Character_Type (Component_Typ) |
| and then No (Next_Index (Nxt_Ind)) |
| and then Nkind_In (Expr, N_String_Literal, N_Operator_Symbol) |
| then |
| -- A string literal used in a multidimensional array |
| -- aggregate in place of the final one-dimensional |
| -- aggregate must not be enclosed in parentheses. |
| |
| if Paren_Count (Expr) /= 0 then |
| Error_Msg_N ("no parenthesis allowed here", Expr); |
| end if; |
| |
| Make_String_Into_Aggregate (Expr); |
| |
| else |
| Error_Msg_N ("nested array aggregate expected", Expr); |
| |
| -- If the expression is parenthesized, this may be |
| -- a missing component association for a 1-aggregate. |
| |
| if Paren_Count (Expr) > 0 then |
| Error_Msg_N |
| ("\if single-component aggregate is intended, " |
| & "write e.g. (1 ='> ...)", Expr); |
| end if; |
| |
| return Failure; |
| end if; |
| end if; |
| |
| -- If it's "... => <>", nothing to resolve |
| |
| if Nkind (Expr) = N_Component_Association then |
| pragma Assert (Box_Present (Expr)); |
| return Success; |
| end if; |
| |
| -- Ada 2005 (AI-231): Propagate the type to the nested aggregate. |
| -- Required to check the null-exclusion attribute (if present). |
| -- This value may be overridden later on. |
| |
| Set_Etype (Expr, Etype (N)); |
| |
| Resolution_OK := Resolve_Array_Aggregate |
| (Expr, Nxt_Ind, Nxt_Ind_Constr, Component_Typ, Others_Allowed); |
| |
| else |
| -- If it's "... => <>", nothing to resolve |
| |
| if Nkind (Expr) = N_Component_Association then |
| pragma Assert (Box_Present (Expr)); |
| return Success; |
| end if; |
| |
| -- Do not resolve the expressions of discrete or others choices |
| -- unless the expression covers a single component, or the |
| -- expander is inactive. |
| |
| -- In SPARK mode, expressions that can perform side effects will |
| -- be recognized by the gnat2why back-end, and the whole |
| -- subprogram will be ignored. So semantic analysis can be |
| -- performed safely. |
| |
| if Single_Elmt |
| or else not Expander_Active |
| or else In_Spec_Expression |
| then |
| Analyze_And_Resolve (Expr, Component_Typ); |
| Check_Expr_OK_In_Limited_Aggregate (Expr); |
| Check_Non_Static_Context (Expr); |
| Aggregate_Constraint_Checks (Expr, Component_Typ); |
| Check_Unset_Reference (Expr); |
| end if; |
| end if; |
| |
| -- If an aggregate component has a type with predicates, an explicit |
| -- predicate check must be applied, as for an assignment statement, |
| -- because the aggegate might not be expanded into individual |
| -- component assignments. If the expression covers several components |
| -- the analysis and the predicate check take place later. |
| |
| if Has_Predicates (Component_Typ) |
| and then Analyzed (Expr) |
| then |
| Apply_Predicate_Check (Expr, Component_Typ); |
| end if; |
| |
| if Raises_Constraint_Error (Expr) |
| and then Nkind (Parent (Expr)) /= N_Component_Association |
| then |
| Set_Raises_Constraint_Error (N); |
| end if; |
| |
| -- If the expression has been marked as requiring a range check, |
| -- then generate it here. It's a bit odd to be generating such |
| -- checks in the analyzer, but harmless since Generate_Range_Check |
| -- does nothing (other than making sure Do_Range_Check is set) if |
| -- the expander is not active. |
| |
| if Do_Range_Check (Expr) then |
| Generate_Range_Check (Expr, Component_Typ, CE_Range_Check_Failed); |
| end if; |
| |
| return Resolution_OK; |
| end Resolve_Aggr_Expr; |
| |
| -------------------------------------------- |
| -- Resolve_Iterated_Component_Association -- |
| -------------------------------------------- |
| |
| procedure Resolve_Iterated_Component_Association |
| (N : Node_Id; |
| Index_Typ : Entity_Id) |
| is |
| Loc : constant Source_Ptr := Sloc (N); |
| |
| Choice : Node_Id; |
| Dummy : Boolean; |
| Ent : Entity_Id; |
| Expr : Node_Id; |
| Id : Entity_Id; |
| |
| begin |
| Choice := First (Discrete_Choices (N)); |
| |
| while Present (Choice) loop |
| if Nkind (Choice) = N_Others_Choice then |
| Others_Present := True; |
| |
| else |
| Analyze (Choice); |
| |
| -- Choice can be a subtype name, a range, or an expression |
| |
| if Is_Entity_Name (Choice) |
| and then Is_Type (Entity (Choice)) |
| and then Base_Type (Entity (Choice)) = Base_Type (Index_Typ) |
| then |
| null; |
| |
| else |
| Analyze_And_Resolve (Choice, Index_Typ); |
| end if; |
| end if; |
| |
| Next (Choice); |
| end loop; |
| |
| -- Create a scope in which to introduce an index, which is usually |
| -- visible in the expression for the component, and needed for its |
| -- analysis. |
| |
| Ent := New_Internal_Entity (E_Loop, Current_Scope, Loc, 'L'); |
| Set_Etype (Ent, Standard_Void_Type); |
| Set_Parent (Ent, Parent (N)); |
| Push_Scope (Ent); |
| Id := |
| Make_Defining_Identifier (Loc, |
| Chars => Chars (Defining_Identifier (N))); |
| |
| -- Insert and decorate the index variable in the current scope. |
| -- The expression has to be analyzed once the index variable is |
| -- directly visible. Mark the variable as referenced to prevent |
| -- spurious warnings, given that subsequent uses of its name in the |
| -- expression will reference the internal (synonym) loop variable. |
| |
| Enter_Name (Id); |
| Set_Etype (Id, Index_Typ); |
| Set_Ekind (Id, E_Variable); |
| Set_Scope (Id, Ent); |
| Set_Referenced (Id); |
| |
| -- Analyze a copy of the expression, to verify legality. We use |
| -- a copy because the expression will be analyzed anew when the |
| -- enclosing aggregate is expanded, and the construct is rewritten |
| -- as a loop with a new index variable. |
| |
| Expr := New_Copy_Tree (Expression (N)); |
| Dummy := Resolve_Aggr_Expr (Expr, False); |
| |
| -- An iterated_component_association may appear in a nested |
| -- aggregate for a multidimensional structure: preserve the bounds |
| -- computed for the expression, as well as the anonymous array |
| -- type generated for it; both are needed during array expansion. |
| -- This does not work for more than two levels of nesting. ??? |
| |
| if Nkind (Expr) = N_Aggregate then |
| Set_Aggregate_Bounds (Expression (N), Aggregate_Bounds (Expr)); |
| Set_Etype (Expression (N), Etype (Expr)); |
| end if; |
| |
| End_Scope; |
| end Resolve_Iterated_Component_Association; |
| |
| -- Local variables |
| |
| Assoc : Node_Id; |
| Choice : Node_Id; |
| Expr : Node_Id; |
| Discard : Node_Id; |
| |
| Aggr_Low : Node_Id := Empty; |
| Aggr_High : Node_Id := Empty; |
| -- The actual low and high bounds of this sub-aggregate |
| |
| Case_Table_Size : Nat; |
| -- Contains the size of the case table needed to sort aggregate choices |
| |
| Choices_Low : Node_Id := Empty; |
| Choices_High : Node_Id := Empty; |
| -- The lowest and highest discrete choices values for a named aggregate |
| |
| Delete_Choice : Boolean; |
| -- Used when replacing a subtype choice with predicate by a list |
| |
| Nb_Elements : Uint := Uint_0; |
| -- The number of elements in a positional aggregate |
| |
| Nb_Discrete_Choices : Nat := 0; |
| -- The overall number of discrete choices (not counting others choice) |
| |
| -- Start of processing for Resolve_Array_Aggregate |
| |
| begin |
| -- Ignore junk empty aggregate resulting from parser error |
| |
| if No (Expressions (N)) |
| and then No (Component_Associations (N)) |
| and then not Null_Record_Present (N) |
| then |
| return False; |
| end if; |
| |
| -- STEP 1: make sure the aggregate is correctly formatted |
| |
| if Present (Component_Associations (N)) then |
| Assoc := First (Component_Associations (N)); |
| while Present (Assoc) loop |
| if Nkind (Assoc) = N_Iterated_Component_Association then |
| Resolve_Iterated_Component_Association (Assoc, Index_Typ); |
| end if; |
| |
| Choice := First (Choice_List (Assoc)); |
| Delete_Choice := False; |
| while Present (Choice) loop |
| if Nkind (Choice) = N_Others_Choice then |
| Others_Present := True; |
| |
| if Choice /= First (Choice_List (Assoc)) |
| or else Present (Next (Choice)) |
| then |
| Error_Msg_N |
| ("OTHERS must appear alone in a choice list", Choice); |
| return Failure; |
| end if; |
| |
| if Present (Next (Assoc)) then |
| Error_Msg_N |
| ("OTHERS must appear last in an aggregate", Choice); |
| return Failure; |
| end if; |
| |
| if Ada_Version = Ada_83 |
| and then Assoc /= First (Component_Associations (N)) |
| and then Nkind_In (Parent (N), N_Assignment_Statement, |
| N_Object_Declaration) |
| then |
| Error_Msg_N |
| ("(Ada 83) illegal context for OTHERS choice", N); |
| end if; |
| |
| elsif Is_Entity_Name (Choice) then |
| Analyze (Choice); |
| |
| declare |
| E : constant Entity_Id := Entity (Choice); |
| New_Cs : List_Id; |
| P : Node_Id; |
| C : Node_Id; |
| |
| begin |
| if Is_Type (E) and then Has_Predicates (E) then |
| Freeze_Before (N, E); |
| |
| if Has_Dynamic_Predicate_Aspect (E) then |
| Error_Msg_NE |
| ("subtype& has dynamic predicate, not allowed " |
| & "in aggregate choice", Choice, E); |
| |
| elsif not Is_OK_Static_Subtype (E) then |
| Error_Msg_NE |
| ("non-static subtype& has predicate, not allowed " |
| & "in aggregate choice", Choice, E); |
| end if; |
| |
| -- If the subtype has a static predicate, replace the |
| -- original choice with the list of individual values |
| -- covered by the predicate. Do not perform this |
| -- transformation if we need to preserve the source |
| -- for ASIS use. |
| -- This should be deferred to expansion time ??? |
| |
| if Present (Static_Discrete_Predicate (E)) |
| and then not ASIS_Mode |
| then |
| Delete_Choice := True; |
| |
| New_Cs := New_List; |
| P := First (Static_Discrete_Predicate (E)); |
| while Present (P) loop |
| C := New_Copy (P); |
| Set_Sloc (C, Sloc (Choice)); |
| Append_To (New_Cs, C); |
| Next (P); |
| end loop; |
| |
| Insert_List_After (Choice, New_Cs); |
| end if; |
| end if; |
| end; |
| end if; |
| |
| Nb_Choices := Nb_Choices + 1; |
| |
| declare |
| C : constant Node_Id := Choice; |
| |
| begin |
| Next (Choice); |
| |
| if Delete_Choice then |
| Remove (C); |
| Nb_Choices := Nb_Choices - 1; |
| Delete_Choice := False; |
| end if; |
| end; |
| end loop; |
| |
| Next (Assoc); |
| end loop; |
| end if; |
| |
| -- At this point we know that the others choice, if present, is by |
| -- itself and appears last in the aggregate. Check if we have mixed |
| -- positional and discrete associations (other than the others choice). |
| |
| if Present (Expressions (N)) |
| and then (Nb_Choices > 1 |
| or else (Nb_Choices = 1 and then not Others_Present)) |
| then |
| Error_Msg_N |
| ("named association cannot follow positional association", |
| First (Choice_List (First (Component_Associations (N))))); |
| return Failure; |
| end if; |
| |
| -- Test for the validity of an others choice if present |
| |
| if Others_Present and then not Others_Allowed then |
| Error_Msg_N |
| ("OTHERS choice not allowed here", |
| First (Choices (First (Component_Associations (N))))); |
| return Failure; |
| end if; |
| |
| -- Protect against cascaded errors |
| |
| if Etype (Index_Typ) = Any_Type then |
| return Failure; |
| end if; |
| |
| -- STEP 2: Process named components |
| |
| if No (Expressions (N)) then |
| if Others_Present then |
| Case_Table_Size := Nb_Choices - 1; |
| else |
| Case_Table_Size := Nb_Choices; |
| end if; |
| |
| Step_2 : declare |
| function Empty_Range (A : Node_Id) return Boolean; |
| -- If an association covers an empty range, some warnings on the |
| -- expression of the association can be disabled. |
| |
| ----------------- |
| -- Empty_Range -- |
| ----------------- |
| |
| function Empty_Range (A : Node_Id) return Boolean is |
| R : constant Node_Id := First (Choices (A)); |
| begin |
| return No (Next (R)) |
| and then Nkind (R) = N_Range |
| and then Compile_Time_Compare |
| (Low_Bound (R), High_Bound (R), False) = GT; |
| end Empty_Range; |
| |
| -- Local variables |
| |
| Low : Node_Id; |
| High : Node_Id; |
| -- Denote the lowest and highest values in an aggregate choice |
| |
| S_Low : Node_Id := Empty; |
| S_High : Node_Id := Empty; |
| -- if a choice in an aggregate is a subtype indication these |
| -- denote the lowest and highest values of the subtype |
| |
| Table : Case_Table_Type (0 .. Case_Table_Size); |
| -- Used to sort all the different choice values. Entry zero is |
| -- reserved for sorting purposes. |
| |
| Single_Choice : Boolean; |
| -- Set to true every time there is a single discrete choice in a |
| -- discrete association |
| |
| Prev_Nb_Discrete_Choices : Nat; |
| -- Used to keep track of the number of discrete choices in the |
| -- current association. |
| |
| Errors_Posted_On_Choices : Boolean := False; |
| -- Keeps track of whether any choices have semantic errors |
| |
| -- Start of processing for Step_2 |
| |
| begin |
| -- STEP 2 (A): Check discrete choices validity |
| |
| Assoc := First (Component_Associations (N)); |
| while Present (Assoc) loop |
| Prev_Nb_Discrete_Choices := Nb_Discrete_Choices; |
| Choice := First (Choice_List (Assoc)); |
| |
| loop |
| Analyze (Choice); |
| |
| if Nkind (Choice) = N_Others_Choice then |
| Single_Choice := False; |
| exit; |
| |
| -- Test for subtype mark without constraint |
| |
| elsif Is_Entity_Name (Choice) and then |
| Is_Type (Entity (Choice)) |
| then |
| if Base_Type (Entity (Choice)) /= Index_Base then |
| Error_Msg_N |
| ("invalid subtype mark in aggregate choice", |
| Choice); |
| return Failure; |
| end if; |
| |
| -- Case of subtype indication |
| |
| elsif Nkind (Choice) = N_Subtype_Indication then |
| Resolve_Discrete_Subtype_Indication (Choice, Index_Base); |
| |
| if Has_Dynamic_Predicate_Aspect |
| (Entity (Subtype_Mark (Choice))) |
| then |
| Error_Msg_NE |
| ("subtype& has dynamic predicate, " |
| & "not allowed in aggregate choice", |
| Choice, Entity (Subtype_Mark (Choice))); |
| end if; |
| |
| -- Does the subtype indication evaluation raise CE? |
| |
| Get_Index_Bounds (Subtype_Mark (Choice), S_Low, S_High); |
| Get_Index_Bounds (Choice, Low, High); |
| Check_Bounds (S_Low, S_High, Low, High); |
| |
| -- Case of range or expression |
| |
| else |
| Resolve (Choice, Index_Base); |
| Check_Unset_Reference (Choice); |
| Check_Non_Static_Context (Choice); |
| |
| -- If semantic errors were posted on the choice, then |
| -- record that for possible early return from later |
| -- processing (see handling of enumeration choices). |
| |
| if Error_Posted (Choice) then |
| Errors_Posted_On_Choices := True; |
| end if; |
| |
| -- Do not range check a choice. This check is redundant |
| -- since this test is already done when we check that the |
| -- bounds of the array aggregate are within range. |
| |
| Set_Do_Range_Check (Choice, False); |
| |
| -- In SPARK, the choice must be static |
| |
| if not (Is_OK_Static_Expression (Choice) |
| or else (Nkind (Choice) = N_Range |
| and then Is_OK_Static_Range (Choice))) |
| then |
| Check_SPARK_05_Restriction |
| ("choice should be static", Choice); |
| end if; |
| end if; |
| |
| -- If we could not resolve the discrete choice stop here |
| |
| if Etype (Choice) = Any_Type then |
| return Failure; |
| |
| -- If the discrete choice raises CE get its original bounds |
| |
| elsif Nkind (Choice) = N_Raise_Constraint_Error then |
| Set_Raises_Constraint_Error (N); |
| Get_Index_Bounds (Original_Node (Choice), Low, High); |
| |
| -- Otherwise get its bounds as usual |
| |
| else |
| Get_Index_Bounds (Choice, Low, High); |
| end if; |
| |
| if (Dynamic_Or_Null_Range (Low, High) |
| or else (Nkind (Choice) = N_Subtype_Indication |
| and then |
| Dynamic_Or_Null_Range (S_Low, S_High))) |
| and then Nb_Choices /= 1 |
| then |
| Error_Msg_N |
| ("dynamic or empty choice in aggregate " |
| & "must be the only choice", Choice); |
| return Failure; |
| end if; |
| |
| if not (All_Composite_Constraints_Static (Low) |
| and then All_Composite_Constraints_Static (High) |
| and then All_Composite_Constraints_Static (S_Low) |
| and then All_Composite_Constraints_Static (S_High)) |
| then |
| Check_Restriction (No_Dynamic_Sized_Objects, Choice); |
| end if; |
| |
| Nb_Discrete_Choices := Nb_Discrete_Choices + 1; |
| Table (Nb_Discrete_Choices).Lo := Low; |
| Table (Nb_Discrete_Choices).Hi := High; |
| Table (Nb_Discrete_Choices).Choice := Choice; |
| |
| Next (Choice); |
| |
| if No (Choice) then |
| |
| -- Check if we have a single discrete choice and whether |
| -- this discrete choice specifies a single value. |
| |
| Single_Choice := |
| (Nb_Discrete_Choices = Prev_Nb_Discrete_Choices + 1) |
| and then (Low = High); |
| |
| exit; |
| end if; |
| end loop; |
| |
| -- Ada 2005 (AI-231) |
| |
| if Ada_Version >= Ada_2005 |
| and then Known_Null (Expression (Assoc)) |
| and then not Empty_Range (Assoc) |
| then |
| Check_Can_Never_Be_Null (Etype (N), Expression (Assoc)); |
| end if; |
| |
| -- Ada 2005 (AI-287): In case of default initialized component |
| -- we delay the resolution to the expansion phase. |
| |
| if Box_Present (Assoc) then |
| |
| -- Ada 2005 (AI-287): In case of default initialization of a |
| -- component the expander will generate calls to the |
| -- corresponding initialization subprogram. We need to call |
| -- Resolve_Aggr_Expr to check the rules about |
| -- dimensionality. |
| |
| if not Resolve_Aggr_Expr |
| (Assoc, Single_Elmt => Single_Choice) |
| then |
| return Failure; |
| end if; |
| |
| elsif Nkind (Assoc) = N_Iterated_Component_Association then |
| null; -- handled above, in a loop context. |
| |
| elsif not Resolve_Aggr_Expr |
| (Expression (Assoc), Single_Elmt => Single_Choice) |
| then |
| return Failure; |
| |
| -- Check incorrect use of dynamically tagged expression |
| |
| -- We differentiate here two cases because the expression may |
| -- not be decorated. For example, the analysis and resolution |
| -- of the expression associated with the others choice will be |
| -- done later with the full aggregate. In such case we |
| -- duplicate the expression tree to analyze the copy and |
| -- perform the required check. |
| |
| elsif not Present (Etype (Expression (Assoc))) then |
| declare |
| Save_Analysis : constant Boolean := Full_Analysis; |
| Expr : constant Node_Id := |
| New_Copy_Tree (Expression (Assoc)); |
| |
| begin |
| Expander_Mode_Save_And_Set (False); |
| Full_Analysis := False; |
| |
| -- Analyze the expression, making sure it is properly |
| -- attached to the tree before we do the analysis. |
| |
| Set_Parent (Expr, Parent (Expression (Assoc))); |
| Analyze (Expr); |
| |
| -- Compute its dimensions now, rather than at the end of |
| -- resolution, because in the case of multidimensional |
| -- aggregates subsequent expansion may lead to spurious |
| -- errors. |
| |
| Check_Expression_Dimensions (Expr, Component_Typ); |
| |
| -- If the expression is a literal, propagate this info |
| -- to the expression in the association, to enable some |
| -- optimizations downstream. |
| |
| if Is_Entity_Name (Expr) |
| and then Present (Entity (Expr)) |
| and then Ekind (Entity (Expr)) = E_Enumeration_Literal |
| then |
| Analyze_And_Resolve |
| (Expression (Assoc), Component_Typ); |
| end if; |
| |
| Full_Analysis := Save_Analysis; |
| Expander_Mode_Restore; |
| |
| if Is_Tagged_Type (Etype (Expr)) then |
| Check_Dynamically_Tagged_Expression |
| (Expr => Expr, |
| Typ => Component_Type (Etype (N)), |
| Related_Nod => N); |
| end if; |
| end; |
| |
| elsif Is_Tagged_Type (Etype (Expression (Assoc))) then |
| Check_Dynamically_Tagged_Expression |
| (Expr => Expression (Assoc), |
| Typ => Component_Type (Etype (N)), |
| Related_Nod => N); |
| end if; |
| |
| Next (Assoc); |
| end loop; |
| |
| -- If aggregate contains more than one choice then these must be |
| -- static. Check for duplicate and missing values. |
| |
| -- Note: there is duplicated code here wrt Check_Choice_Set in |
| -- the body of Sem_Case, and it is possible we could just reuse |
| -- that procedure. To be checked ??? |
| |
| if Nb_Discrete_Choices > 1 then |
| Check_Choices : declare |
| Choice : Node_Id; |
| -- Location of choice for messages |
| |
| Hi_Val : Uint; |
| Lo_Val : Uint; |
| -- High end of one range and Low end of the next. Should be |
| -- contiguous if there is no hole in the list of values. |
| |
| Lo_Dup : Uint; |
| Hi_Dup : Uint; |
| -- End points of duplicated range |
| |
| Missing_Or_Duplicates : Boolean := False; |
| -- Set True if missing or duplicate choices found |
| |
| procedure Output_Bad_Choices (Lo, Hi : Uint; C : Node_Id); |
| -- Output continuation message with a representation of the |
| -- bounds (just Lo if Lo = Hi, else Lo .. Hi). C is the |
| -- choice node where the message is to be posted. |
| |
| ------------------------ |
| -- Output_Bad_Choices -- |
| ------------------------ |
| |
| procedure Output_Bad_Choices (Lo, Hi : Uint; C : Node_Id) is |
| begin |
| -- Enumeration type case |
| |
| if Is_Enumeration_Type (Index_Typ) then |
| Error_Msg_Name_1 := |
| Chars (Get_Enum_Lit_From_Pos (Index_Typ, Lo, Loc)); |
| Error_Msg_Name_2 := |
| Chars (Get_Enum_Lit_From_Pos (Index_Typ, Hi, Loc)); |
| |
| if Lo = Hi then |
| Error_Msg_N ("\\ %!", C); |
| else |
| Error_Msg_N ("\\ % .. %!", C); |
| end if; |
| |
| -- Integer types case |
| |
| else |
| Error_Msg_Uint_1 := Lo; |
| Error_Msg_Uint_2 := Hi; |
| |
| if Lo = Hi then |
| Error_Msg_N ("\\ ^!", C); |
| else |
| Error_Msg_N ("\\ ^ .. ^!", C); |
| end if; |
| end if; |
| end Output_Bad_Choices; |
| |
| -- Start of processing for Check_Choices |
| |
| begin |
| Sort_Case_Table (Table); |
| |
| -- First we do a quick linear loop to find out if we have |
| -- any duplicates or missing entries (usually we have a |
| -- legal aggregate, so this will get us out quickly). |
| |
| for J in 1 .. Nb_Discrete_Choices - 1 loop |
| Hi_Val := Expr_Value (Table (J).Hi); |
| Lo_Val := Expr_Value (Table (J + 1).Lo); |
| |
| if Lo_Val <= Hi_Val |
| or else (Lo_Val > Hi_Val + 1 |
| and then not Others_Present) |
| then |
| Missing_Or_Duplicates := True; |
| exit; |
| end if; |
| end loop; |
| |
| -- If we have missing or duplicate entries, first fill in |
| -- the Highest entries to make life easier in the following |
| -- loops to detect bad entries. |
| |
| if Missing_Or_Duplicates then |
| Table (1).Highest := Expr_Value (Table (1).Hi); |
| |
| for J in 2 .. Nb_Discrete_Choices loop |
| Table (J).Highest := |
| UI_Max |
| (Table (J - 1).Highest, Expr_Value (Table (J).Hi)); |
| end loop; |
| |
| -- Loop through table entries to find duplicate indexes |
| |
| for J in 2 .. Nb_Discrete_Choices loop |
| Lo_Val := Expr_Value (Table (J).Lo); |
| Hi_Val := Expr_Value (Table (J).Hi); |
| |
| -- Case where we have duplicates (the lower bound of |
| -- this choice is less than or equal to the highest |
| -- high bound found so far). |
| |
| if Lo_Val <= Table (J - 1).Highest then |
| |
| -- We move backwards looking for duplicates. We can |
| -- abandon this loop as soon as we reach a choice |
| -- highest value that is less than Lo_Val. |
| |
| for K in reverse 1 .. J - 1 loop |
| exit when Table (K).Highest < Lo_Val; |
| |
| -- Here we may have duplicates between entries |
| -- for K and J. Get range of duplicates. |
| |
| Lo_Dup := |
| UI_Max (Lo_Val, Expr_Value (Table (K).Lo)); |
| Hi_Dup := |
| UI_Min (Hi_Val, Expr_Value (Table (K).Hi)); |
| |
| -- Nothing to do if duplicate range is null |
| |
| if Lo_Dup > Hi_Dup then |
| null; |
| |
| -- Otherwise place proper message. Because |
| -- of the missing expansion of subtypes with |
| -- predicates in ASIS mode, do not report |
| -- spurious overlap errors. |
| |
| elsif ASIS_Mode |
| and then |
| ((Is_Type (Entity (Table (J).Choice)) |
| and then Has_Predicates |
| (Entity (Table (J).Choice))) |
| or else |
| (Is_Type (Entity (Table (K).Choice)) |
| and then Has_Predicates |
| (Entity (Table (K).Choice)))) |
| then |
| null; |
| |
| else |
| -- We place message on later choice, with a |
| -- line reference to the earlier choice. |
| |
| if Sloc (Table (J).Choice) < |
| Sloc (Table (K).Choice) |
| then |
| Choice := Table (K).Choice; |
| Error_Msg_Sloc := Sloc (Table (J).Choice); |
| else |
| Choice := Table (J).Choice; |
| Error_Msg_Sloc := Sloc (Table (K).Choice); |
| end if; |
| |
| if Lo_Dup = Hi_Dup then |
| Error_Msg_N |
| ("index value in array aggregate " |
| & "duplicates the one given#!", Choice); |
| else |
| Error_Msg_N |
| ("index values in array aggregate " |
| & "duplicate those given#!", Choice); |
| end if; |
| |
| Output_Bad_Choices (Lo_Dup, Hi_Dup, Choice); |
| end if; |
| end loop; |
| end if; |
| end loop; |
| |
| -- Loop through entries in table to find missing indexes. |
| -- Not needed if others, since missing impossible. |
| |
| if not Others_Present then |
| for J in 2 .. Nb_Discrete_Choices loop |
| Lo_Val := Expr_Value (Table (J).Lo); |
| Hi_Val := Table (J - 1).Highest; |
| |
| if Lo_Val > Hi_Val + 1 then |
| |
| declare |
| Error_Node : Node_Id; |
| |
| begin |
| -- If the choice is the bound of a range in |
| -- a subtype indication, it is not in the |
| -- source lists for the aggregate itself, so |
| -- post the error on the aggregate. Otherwise |
| -- post it on choice itself. |
| |
| Choice := Table (J).Choice; |
| |
| if Is_List_Member (Choice) then |
| Error_Node := Choice; |
| else |
| Error_Node := N; |
| end if; |
| |
| if Hi_Val + 1 = Lo_Val - 1 then |
| Error_Msg_N |
| ("missing index value " |
| & "in array aggregate!", Error_Node); |
| else |
| Error_Msg_N |
| ("missing index values " |
| & "in array aggregate!", Error_Node); |
| end if; |
| |
| Output_Bad_Choices |
| (Hi_Val + 1, Lo_Val - 1, Error_Node); |
| end; |
| end if; |
| end loop; |
| end if; |
| |
| -- If either missing or duplicate values, return failure |
| |
| Set_Etype (N, Any_Composite); |
| return Failure; |
| end if; |
| end Check_Choices; |
| end if; |
| |
| -- STEP 2 (B): Compute aggregate bounds and min/max choices values |
| |
| if Nb_Discrete_Choices > 0 then |
| Choices_Low := Table (1).Lo; |
| Choices_High := Table (Nb_Discrete_Choices).Hi; |
| end if; |
| |
| -- If Others is present, then bounds of aggregate come from the |
| -- index constraint (not the choices in the aggregate itself). |
| |
| if Others_Present then |
| Get_Index_Bounds (Index_Constr, Aggr_Low, Aggr_High); |
| |
| -- Abandon processing if either bound is already signalled as |
| -- an error (prevents junk cascaded messages and blow ups). |
| |
| if Nkind (Aggr_Low) = N_Error |
| or else |
| Nkind (Aggr_High) = N_Error |
| then |
| return False; |
| end if; |
| |
| -- No others clause present |
| |
| else |
| -- Special processing if others allowed and not present. This |
| -- means that the bounds of the aggregate come from the index |
| -- constraint (and the length must match). |
| |
| if Others_Allowed then |
| Get_Index_Bounds (Index_Constr, Aggr_Low, Aggr_High); |
| |
| -- Abandon processing if either bound is already signalled |
| -- as an error (stop junk cascaded messages and blow ups). |
| |
| if Nkind (Aggr_Low) = N_Error |
| or else |
| Nkind (Aggr_High) = N_Error |
| then |
| return False; |
| end if; |
| |
| -- If others allowed, and no others present, then the array |
| -- should cover all index values. If it does not, we will |
| -- get a length check warning, but there is two cases where |
| -- an additional warning is useful: |
| |
| -- If we have no positional components, and the length is |
| -- wrong (which we can tell by others being allowed with |
| -- missing components), and the index type is an enumeration |
| -- type, then issue appropriate warnings about these missing |
| -- components. They are only warnings, since the aggregate |
| -- is fine, it's just the wrong length. We skip this check |
| -- for standard character types (since there are no literals |
| -- and it is too much trouble to concoct them), and also if |
| -- any of the bounds have values that are not known at |
| -- compile time. |
| |
| -- Another case warranting a warning is when the length |
| -- is right, but as above we have an index type that is |
| -- an enumeration, and the bounds do not match. This is a |
| -- case where dubious sliding is allowed and we generate a |
| -- warning that the bounds do not match. |
| |
| if No (Expressions (N)) |
| and then Nkind (Index) = N_Range |
| and then Is_Enumeration_Type (Etype (Index)) |
| and then not Is_Standard_Character_Type (Etype (Index)) |
| and then Compile_Time_Known_Value (Aggr_Low) |
| and then Compile_Time_Known_Value (Aggr_High) |
| and then Compile_Time_Known_Value (Choices_Low) |
| and then Compile_Time_Known_Value (Choices_High) |
| then |
| -- If any of the expressions or range bounds in choices |
| -- have semantic errors, then do not attempt further |
| -- resolution, to prevent cascaded errors. |
| |
| if Errors_Posted_On_Choices then |
| return Failure; |
| end if; |
| |
| declare |
| ALo : constant Node_Id := Expr_Value_E (Aggr_Low); |
| AHi : constant Node_Id := Expr_Value_E (Aggr_High); |
| CLo : constant Node_Id := Expr_Value_E (Choices_Low); |
| CHi : constant Node_Id := Expr_Value_E (Choices_High); |
| |
| Ent : Entity_Id; |
| |
| begin |
| -- Warning case 1, missing values at start/end. Only |
| -- do the check if the number of entries is too small. |
| |
| if (Enumeration_Pos (CHi) - Enumeration_Pos (CLo)) |
| < |
| (Enumeration_Pos (AHi) - Enumeration_Pos (ALo)) |
| then |
| Error_Msg_N |
| ("missing index value(s) in array aggregate??", |
| N); |
| |
| -- Output missing value(s) at start |
| |
| if Chars (ALo) /= Chars (CLo) then |
| Ent := Prev (CLo); |
| |
| if Chars (ALo) = Chars (Ent) then |
| Error_Msg_Name_1 := Chars (ALo); |
| Error_Msg_N ("\ %??", N); |
| else |
| Error_Msg_Name_1 := Chars (ALo); |
| Error_Msg_Name_2 := Chars (Ent); |
| Error_Msg_N ("\ % .. %??", N); |
| end if; |
| end if; |
| |
| -- Output missing value(s) at end |
| |
| if Chars (AHi) /= Chars (CHi) then |
| Ent := Next (CHi); |
| |
| if Chars (AHi) = Chars (Ent) then |
| Error_Msg_Name_1 := Chars (Ent); |
| Error_Msg_N ("\ %??", N); |
| else |
| Error_Msg_Name_1 := Chars (Ent); |
| Error_Msg_Name_2 := Chars (AHi); |
| Error_Msg_N ("\ % .. %??", N); |
| end if; |
| end if; |
| |
| -- Warning case 2, dubious sliding. The First_Subtype |
| -- test distinguishes between a constrained type where |
| -- sliding is not allowed (so we will get a warning |
| -- later that Constraint_Error will be raised), and |
| -- the unconstrained case where sliding is permitted. |
| |
| elsif (Enumeration_Pos (CHi) - Enumeration_Pos (CLo)) |
| = |
| (Enumeration_Pos (AHi) - Enumeration_Pos (ALo)) |
| and then Chars (ALo) /= Chars (CLo) |
| and then |
| not Is_Constrained (First_Subtype (Etype (N))) |
| then |
| Error_Msg_N |
| ("bounds of aggregate do not match target??", N); |
| end if; |
| end; |
| end if; |
| end if; |
| |
| -- If no others, aggregate bounds come from aggregate |
| |
| Aggr_Low := Choices_Low; |
| Aggr_High := Choices_High; |
| end if; |
| end Step_2; |
| |
| -- STEP 3: Process positional components |
| |
| else |
| -- STEP 3 (A): Process positional elements |
| |
| Expr := First (Expressions (N)); |
| Nb_Elements := Uint_0; |
| while Present (Expr) loop |
| Nb_Elements := Nb_Elements + 1; |
| |
| -- Ada 2005 (AI-231) |
| |
| if Ada_Version >= Ada_2005 and then Known_Null (Expr) then |
| Check_Can_Never_Be_Null (Etype (N), Expr); |
| end if; |
| |
| if not Resolve_Aggr_Expr (Expr, Single_Elmt => True) then |
| return Failure; |
| end if; |
| |
| -- Check incorrect use of dynamically tagged expression |
| |
| if Is_Tagged_Type (Etype (Expr)) then |
| Check_Dynamically_Tagged_Expression |
| (Expr => Expr, |
| Typ => Component_Type (Etype (N)), |
| Related_Nod => N); |
| end if; |
| |
| Next (Expr); |
| end loop; |
| |
| if Others_Present then |
| Assoc := Last (Component_Associations (N)); |
| |
| -- Ada 2005 (AI-231) |
| |
| if Ada_Version >= Ada_2005 and then Known_Null (Assoc) then |
| Check_Can_Never_Be_Null (Etype (N), Expression (Assoc)); |
| end if; |
| |
| -- Ada 2005 (AI-287): In case of default initialized component, |
| -- we delay the resolution to the expansion phase. |
| |
| if Box_Present (Assoc) then |
| |
| -- Ada 2005 (AI-287): In case of default initialization of a |
| -- component the expander will generate calls to the |
| -- corresponding initialization subprogram. We need to call |
| -- Resolve_Aggr_Expr to check the rules about |
| -- dimensionality. |
| |
| if not Resolve_Aggr_Expr (Assoc, Single_Elmt => False) then |
| return Failure; |
| end if; |
| |
| elsif not Resolve_Aggr_Expr (Expression (Assoc), |
| Single_Elmt => False) |
| then |
| return Failure; |
| |
| -- Check incorrect use of dynamically tagged expression. The |
| -- expression of the others choice has not been resolved yet. |
| -- In order to diagnose the semantic error we create a duplicate |
| -- tree to analyze it and perform the check. |
| |
| else |
| declare |
| Save_Analysis : constant Boolean := Full_Analysis; |
| Expr : constant Node_Id := |
| New_Copy_Tree (Expression (Assoc)); |
| |
| begin |
| Expander_Mode_Save_And_Set (False); |
| Full_Analysis := False; |
| Analyze (Expr); |
| Full_Analysis := Save_Analysis; |
| Expander_Mode_Restore; |
| |
| if Is_Tagged_Type (Etype (Expr)) then |
| Check_Dynamically_Tagged_Expression |
| (Expr => Expr, |
| Typ => Component_Type (Etype (N)), |
| Related_Nod => N); |
| end if; |
| end; |
| end if; |
| end if; |
| |
| -- STEP 3 (B): Compute the aggregate bounds |
| |
| if Others_Present then |
| Get_Index_Bounds (Index_Constr, Aggr_Low, Aggr_High); |
| |
| else |
| if Others_Allowed then |
| Get_Index_Bounds (Index_Constr, Aggr_Low, Discard); |
| else |
| Aggr_Low := Index_Typ_Low; |
| end if; |
| |
| Aggr_High := Add (Nb_Elements - 1, To => Aggr_Low); |
| Check_Bound (Index_Base_High, Aggr_High); |
| end if; |
| end if; |
| |
| -- STEP 4: Perform static aggregate checks and save the bounds |
| |
| -- Check (A) |
| |
| Check_Bounds (Index_Typ_Low, Index_Typ_High, Aggr_Low, Aggr_High); |
| Check_Bounds (Index_Base_Low, Index_Base_High, Aggr_Low, Aggr_High); |
| |
| -- Check (B) |
| |
| if Others_Present and then Nb_Discrete_Choices > 0 then |
| Check_Bounds (Aggr_Low, Aggr_High, Choices_Low, Choices_High); |
| Check_Bounds (Index_Typ_Low, Index_Typ_High, |
| Choices_Low, Choices_High); |
| Check_Bounds (Index_Base_Low, Index_Base_High, |
| Choices_Low, Choices_High); |
| |
| -- Check (C) |
| |
| elsif Others_Present and then Nb_Elements > 0 then |
| Check_Length (Aggr_Low, Aggr_High, Nb_Elements); |
| Check_Length (Index_Typ_Low, Index_Typ_High, Nb_Elements); |
| Check_Length (Index_Base_Low, Index_Base_High, Nb_Elements); |
| end if; |
| |
| if Raises_Constraint_Error (Aggr_Low) |
| or else Raises_Constraint_Error (Aggr_High) |
| then |
| Set_Raises_Constraint_Error (N); |
| end if; |
| |
| Aggr_Low := Duplicate_Subexpr (Aggr_Low); |
| |
| -- Do not duplicate Aggr_High if Aggr_High = Aggr_Low + Nb_Elements |
| -- since the addition node returned by Add is not yet analyzed. Attach |
| -- to tree and analyze first. Reset analyzed flag to ensure it will get |
| -- analyzed when it is a literal bound whose type must be properly set. |
| |
| if Others_Present or else Nb_Discrete_Choices > 0 then |
| Aggr_High := Duplicate_Subexpr (Aggr_High); |
| |
| if Etype (Aggr_High) = Universal_Integer then |
| Set_Analyzed (Aggr_High, False); |
| end if; |
| end if; |
| |
| -- If the aggregate already has bounds attached to it, it means this is |
| -- a positional aggregate created as an optimization by |
| -- Exp_Aggr.Convert_To_Positional, so we don't want to change those |
| -- bounds. |
| |
| if Present (Aggregate_Bounds (N)) and then not Others_Allowed then |
| Aggr_Low := Low_Bound (Aggregate_Bounds (N)); |
| Aggr_High := High_Bound (Aggregate_Bounds (N)); |
| end if; |
| |
| Set_Aggregate_Bounds |
| (N, Make_Range (Loc, Low_Bound => Aggr_Low, High_Bound => Aggr_High)); |
| |
| -- The bounds may contain expressions that must be inserted upwards. |
| -- Attach them fully to the tree. After analysis, remove side effects |
| -- from upper bound, if still needed. |
| |
| Set_Parent (Aggregate_Bounds (N), N); |
| Analyze_And_Resolve (Aggregate_Bounds (N), Index_Typ); |
| Check_Unset_Reference (Aggregate_Bounds (N)); |
| |
| if not Others_Present and then Nb_Discrete_Choices = 0 then |
| Set_High_Bound |
| (Aggregate_Bounds (N), |
| Duplicate_Subexpr (High_Bound (Aggregate_Bounds (N)))); |
| end if; |
| |
| -- Check the dimensions of each component in the array aggregate |
| |
| Analyze_Dimension_Array_Aggregate (N, Component_Typ); |
| |
| return Success; |
| end Resolve_Array_Aggregate; |
| |
| ----------------------------- |
| -- Resolve_Delta_Aggregate -- |
| ----------------------------- |
| |
| procedure Resolve_Delta_Aggregate (N : Node_Id; Typ : Entity_Id) is |
| Base : constant Node_Id := Expression (N); |
| |
| begin |
| if not Is_Composite_Type (Typ) then |
| Error_Msg_N ("not a composite type", N); |
| end if; |
| |
| Analyze_And_Resolve (Base, Typ); |
| |
| if Is_Array_Type (Typ) then |
| Resolve_Delta_Array_Aggregate (N, Typ); |
| else |
| Resolve_Delta_Record_Aggregate (N, Typ); |
| end if; |
| |
| Set_Etype (N, Typ); |
| end Resolve_Delta_Aggregate; |
| |
| ----------------------------------- |
| -- Resolve_Delta_Array_Aggregate -- |
| ----------------------------------- |
| |
| procedure Resolve_Delta_Array_Aggregate (N : Node_Id; Typ : Entity_Id) is |
| Deltas : constant List_Id := Component_Associations (N); |
| |
| Assoc : Node_Id; |
| Choice : Node_Id; |
| Index_Type : Entity_Id; |
| |
| begin |
| Index_Type := Etype (First_Index (Typ)); |
| |
| Assoc := First (Deltas); |
| while Present (Assoc) loop |
| if Nkind (Assoc) = N_Iterated_Component_Association then |
| Choice := First (Choice_List (Assoc)); |
| while Present (Choice) loop |
| if Nkind (Choice) = N_Others_Choice then |
| Error_Msg_N |
| ("others not allowed in delta aggregate", Choice); |
| |
| else |
| Analyze_And_Resolve (Choice, Index_Type); |
| end if; |
| |
| Next (Choice); |
| end loop; |
| |
| declare |
| Id : constant Entity_Id := Defining_Identifier (Assoc); |
| Ent : constant Entity_Id := |
| New_Internal_Entity |
| (E_Loop, Current_Scope, Sloc (Assoc), 'L'); |
| |
| begin |
| Set_Etype (Ent, Standard_Void_Type); |
| Set_Parent (Ent, Assoc); |
| |
| if No (Scope (Id)) then |
| Enter_Name (Id); |
| Set_Etype (Id, Index_Type); |
| Set_Ekind (Id, E_Variable); |
| Set_Scope (Id, Ent); |
| end if; |
| |
| Push_Scope (Ent); |
| Analyze_And_Resolve |
| (New_Copy_Tree (Expression (Assoc)), Component_Type (Typ)); |
| End_Scope; |
| end; |
| |
| else |
| Choice := First (Choice_List (Assoc)); |
| while Present (Choice) loop |
| if Nkind (Choice) = N_Others_Choice then |
| Error_Msg_N |
| ("others not allowed in delta aggregate", Choice); |
| |
| else |
| Analyze (Choice); |
| |
| if Is_Entity_Name (Choice) |
| and then Is_Type (Entity (Choice)) |
| then |
| -- Choice covers a range of values |
| |
| if Base_Type (Entity (Choice)) /= |
| Base_Type (Index_Type) |
| then |
| Error_Msg_NE |
| ("choice does mat match index type of", |
| Choice, Typ); |
| end if; |
| else |
| Resolve (Choice, Index_Type); |
| end if; |
| end if; |
| |
| Next (Choice); |
| end loop; |
| |
| Analyze_And_Resolve (Expression (Assoc), Component_Type (Typ)); |
| end if; |
| |
| Next (Assoc); |
| end loop; |
| end Resolve_Delta_Array_Aggregate; |
| |
| ------------------------------------ |
| -- Resolve_Delta_Record_Aggregate -- |
| ------------------------------------ |
| |
| procedure Resolve_Delta_Record_Aggregate (N : Node_Id; Typ : Entity_Id) is |
| |
| -- Variables used to verify that discriminant-dependent components |
| -- appear in the same variant. |
| |
| Comp_Ref : Entity_Id := Empty; -- init to avoid warning |
| Variant : Node_Id; |
| |
| procedure Check_Variant (Id : Entity_Id); |
| -- If a given component of the delta aggregate appears in a variant |
| -- part, verify that it is within the same variant as that of previous |
| -- specified variant components of the delta. |
| |
| function Get_Component_Type (Nam : Node_Id) return Entity_Id; |
| -- Locate component with a given name and return its type. If none found |
| -- report error. |
| |
| function Nested_In (V1 : Node_Id; V2 : Node_Id) return Boolean; |
| -- Determine whether variant V1 is within variant V2 |
| |
| function Variant_Depth (N : Node_Id) return Integer; |
| -- Determine the distance of a variant to the enclosing type |
| -- declaration. |
| |
| -------------------- |
| -- Check_Variant -- |
| -------------------- |
| |
| procedure Check_Variant (Id : Entity_Id) is |
| Comp : Entity_Id; |
| Comp_Variant : Node_Id; |
| |
| begin |
| if not Has_Discriminants (Typ) then |
| return; |
| end if; |
| |
| Comp := First_Entity (Typ); |
| while Present (Comp) loop |
| exit when Chars (Comp) = Chars (Id); |
| Next_Component (Comp); |
| end loop; |
| |
| -- Find the variant, if any, whose component list includes the |
| -- component declaration. |
| |
| Comp_Variant := Parent (Parent (List_Containing (Parent (Comp)))); |
| if Nkind (Comp_Variant) = N_Variant then |
| if No (Variant) then |
| Variant := Comp_Variant; |
| Comp_Ref := Comp; |
| |
| elsif Variant /= Comp_Variant then |
| declare |
| D1 : constant Integer := Variant_Depth (Variant); |
| D2 : constant Integer := Variant_Depth (Comp_Variant); |
| |
| begin |
| if D1 = D2 |
| or else |
| (D1 > D2 and then not Nested_In (Variant, Comp_Variant)) |
| or else |
| (D2 > D1 and then not Nested_In (Comp_Variant, Variant)) |
| then |
| pragma Assert (Present (Comp_Ref)); |
| Error_Msg_Node_2 := Comp_Ref; |
| Error_Msg_NE |
| ("& and & appear in different variants", Id, Comp); |
| |
| -- Otherwise retain the deeper variant for subsequent tests |
| |
| elsif D2 > D1 then |
| Variant := Comp_Variant; |
| end if; |
| end; |
| end if; |
| end if; |
| end Check_Variant; |
| |
| ------------------------ |
| -- Get_Component_Type -- |
| ------------------------ |
| |
| function Get_Component_Type (Nam : Node_Id) return Entity_Id is |
| Comp : Entity_Id; |
| |
| begin |
| Comp := First_Entity (Typ); |
| while Present (Comp) loop |
| if Chars (Comp) = Chars (Nam) then |
| if Ekind (Comp) = E_Discriminant then |
| Error_Msg_N ("delta cannot apply to discriminant", Nam); |
| end if; |
| |
| return Etype (Comp); |
| end if; |
| |
| Comp := Next_Entity (Comp); |
| end loop; |
| |
| Error_Msg_NE ("type& has no component with this name", Nam, Typ); |
| return Any_Type; |
| end Get_Component_Type; |
| |
| --------------- |
| -- Nested_In -- |
| --------------- |
| |
| function Nested_In (V1, V2 : Node_Id) return Boolean is |
| Par : Node_Id; |
| |
| begin |
| Par := Parent (V1); |
| while Nkind (Par) /= N_Full_Type_Declaration loop |
| if Par = V2 then |
| return True; |
| end if; |
| |
| Par := Parent (Par); |
| end loop; |
| |
| return False; |
| end Nested_In; |
| |
| ------------------- |
| -- Variant_Depth -- |
| ------------------- |
| |
| function Variant_Depth (N : Node_Id) return Integer is |
| Depth : Integer; |
| Par : Node_Id; |
| |
| begin |
| Depth := 0; |
| Par := Parent (N); |
| while Nkind (Par) /= N_Full_Type_Declaration loop |
| Depth := Depth + 1; |
| Par := Parent (Par); |
| end loop; |
| |
| return Depth; |
| end Variant_Depth; |
| |
| -- Local variables |
| |
| Deltas : constant List_Id := Component_Associations (N); |
| |
| Assoc : Node_Id; |
| Choice : Node_Id; |
| Comp_Type : Entity_Id := Empty; -- init to avoid warning |
| |
| -- Start of processing for Resolve_Delta_Record_Aggregate |
| |
| begin |
| Variant := Empty; |
| |
| Assoc := First (Deltas); |
| while Present (Assoc) loop |
| Choice := First (Choice_List (Assoc)); |
| while Present (Choice) loop |
| Comp_Type := Get_Component_Type (Choice); |
| |
| if Comp_Type /= Any_Type then |
| Check_Variant (Choice); |
| end if; |
| |
| Next (Choice); |
| end loop; |
| |
| pragma Assert (Present (Comp_Type)); |
| Analyze_And_Resolve (Expression (Assoc), Comp_Type); |
| Next (Assoc); |
| end loop; |
| end Resolve_Delta_Record_Aggregate; |
| |
| --------------------------------- |
| -- Resolve_Extension_Aggregate -- |
| --------------------------------- |
| |
| -- There are two cases to consider: |
| |
| -- a) If the ancestor part is a type mark, the components needed are the |
| -- difference between the components of the expected type and the |
| -- components of the given type mark. |
| |
| -- b) If the ancestor part is an expression, it must be unambiguous, and |
| -- once we have its type we can also compute the needed components as in |
| -- the previous case. In both cases, if the ancestor type is not the |
| -- immediate ancestor, we have to build this ancestor recursively. |
| |
| -- In both cases, discriminants of the ancestor type do not play a role in |
| -- the resolution of the needed components, because inherited discriminants |
| -- cannot be used in a type extension. As a result we can compute |
| -- independently the list of components of the ancestor type and of the |
| -- expected type. |
| |
| procedure Resolve_Extension_Aggregate (N : Node_Id; Typ : Entity_Id) is |
| A : constant Node_Id := Ancestor_Part (N); |
| A_Type : Entity_Id; |
| I : Interp_Index; |
| It : Interp; |
| |
| function Valid_Limited_Ancestor (Anc : Node_Id) return Boolean; |
| -- If the type is limited, verify that the ancestor part is a legal |
| -- expression (aggregate or function call, including 'Input)) that does |
| -- not require a copy, as specified in 7.5(2). |
| |
| function Valid_Ancestor_Type return Boolean; |
| -- Verify that the type of the ancestor part is a non-private ancestor |
| -- of the expected type, which must be a type extension. |
| |
| procedure Transform_BIP_Assignment (Typ : Entity_Id); |
| -- For an extension aggregate whose ancestor part is a build-in-place |
| -- call returning a nonlimited type, this is used to transform the |
| -- assignment to the ancestor part to use a temp. |
| |
| ---------------------------- |
| -- Valid_Limited_Ancestor -- |
| ---------------------------- |
| |
| function Valid_Limited_Ancestor (Anc : Node_Id) return Boolean is |
| begin |
| if Is_Entity_Name (Anc) and then Is_Type (Entity (Anc)) then |
| return True; |
| |
| -- The ancestor must be a call or an aggregate, but a call may |
| -- have been expanded into a temporary, so check original node. |
| |
| elsif Nkind_In (Anc, N_Aggregate, |
| N_Extension_Aggregate, |
| N_Function_Call) |
| then |
| return True; |
| |
| elsif Nkind (Original_Node (Anc)) = N_Function_Call then |
| return True; |
| |
| elsif Nkind (Anc) = N_Attribute_Reference |
| and then Attribute_Name (Anc) = Name_Input |
| then |
| return True; |
| |
| elsif Nkind (Anc) = N_Qualified_Expression then |
| return Valid_Limited_Ancestor (Expression (Anc)); |
| |
| else |
| return False; |
| end if; |
| end Valid_Limited_Ancestor; |
| |
| ------------------------- |
| -- Valid_Ancestor_Type -- |
| ------------------------- |
| |
| function Valid_Ancestor_Type return Boolean is |
| Imm_Type : Entity_Id; |
| |
| begin |
| Imm_Type := Base_Type (Typ); |
| while Is_Derived_Type (Imm_Type) loop |
| if Etype (Imm_Type) = Base_Type (A_Type) then |
| return True; |
| |
| -- The base type of the parent type may appear as a private |
| -- extension if it is declared as such in a parent unit of the |
| -- current one. For consistency of the subsequent analysis use |
| -- the partial view for the ancestor part. |
| |
| elsif Is_Private_Type (Etype (Imm_Type)) |
| and then Present (Full_View (Etype (Imm_Type))) |
| and then Base_Type (A_Type) = Full_View (Etype (Imm_Type)) |
| then |
| A_Type := Etype (Imm_Type); |
| return True; |
| |
| -- The parent type may be a private extension. The aggregate is |
| -- legal if the type of the aggregate is an extension of it that |
| -- is not a private extension. |
| |
| elsif Is_Private_Type (A_Type) |
| and then not Is_Private_Type (Imm_Type) |
| and then Present (Full_View (A_Type)) |
| and then Base_Type (Full_View (A_Type)) = Etype (Imm_Type) |
| then |
| return True; |
| |
| else |
| Imm_Type := Etype (Base_Type (Imm_Type)); |
| end if; |
| end loop; |
| |
| -- If previous loop did not find a proper ancestor, report error |
| |
| Error_Msg_NE ("expect ancestor type of &", A, Typ); |
| return False; |
| end Valid_Ancestor_Type; |
| |
| ------------------------------ |
| -- Transform_BIP_Assignment -- |
| ------------------------------ |
| |
| procedure Transform_BIP_Assignment (Typ : Entity_Id) is |
| Loc : constant Source_Ptr := Sloc (N); |
| Def_Id : constant Entity_Id := Make_Temporary (Loc, 'Y', A); |
| Obj_Decl : constant Node_Id := |
| Make_Object_Declaration (Loc, |
| Defining_Identifier => Def_Id, |
| Constant_Present => True, |
| Object_Definition => New_Occurrence_Of (Typ, Loc), |
| Expression => A, |
| Has_Init_Expression => True); |
| begin |
| Set_Etype (Def_Id, Typ); |
| Set_Ancestor_Part (N, New_Occurrence_Of (Def_Id, Loc)); |
| Insert_Action (N, Obj_Decl); |
| end Transform_BIP_Assignment; |
| |
| -- Start of processing for Resolve_Extension_Aggregate |
| |
| begin |
| -- Analyze the ancestor part and account for the case where it is a |
| -- parameterless function call. |
| |
| Analyze (A); |
| Check_Parameterless_Call (A); |
| |
| -- In SPARK, the ancestor part cannot be a type mark |
| |
| if Is_Entity_Name (A) and then Is_Type (Entity (A)) then |
| Check_SPARK_05_Restriction ("ancestor part cannot be a type mark", A); |
| |
| -- AI05-0115: if the ancestor part is a subtype mark, the ancestor |
| -- must not have unknown discriminants. |
| |
| if Has_Unknown_Discriminants (Root_Type (Typ)) then |
| Error_Msg_NE |
| ("aggregate not available for type& whose ancestor " |
| & "has unknown discriminants", N, Typ); |
| end if; |
| end if; |
| |
| if not Is_Tagged_Type (Typ) then |
| Error_Msg_N ("type of extension aggregate must be tagged", N); |
| return; |
| |
| elsif Is_Limited_Type (Typ) then |
| |
| -- Ada 2005 (AI-287): Limited aggregates are allowed |
| |
| if Ada_Version < Ada_2005 then |
| Error_Msg_N ("aggregate type cannot be limited", N); |
| Explain_Limited_Type (Typ, N); |
| return; |
| |
| elsif Valid_Limited_Ancestor (A) then |
| null; |
| |
| else |
| Error_Msg_N |
| ("limited ancestor part must be aggregate or function call", A); |
| end if; |
| |
| elsif Is_Class_Wide_Type (Typ) then |
| Error_Msg_N ("aggregate cannot be of a class-wide type", N); |
| return; |
| end if; |
| |
| if Is_Entity_Name (A) and then Is_Type (Entity (A)) then |
| A_Type := Get_Full_View (Entity (A)); |
| |
| if Valid_Ancestor_Type then |
| Set_Entity (A, A_Type); |
| Set_Etype (A, A_Type); |
| |
| Validate_Ancestor_Part (N); |
| Resolve_Record_Aggregate (N, Typ); |
| end if; |
| |
| elsif Nkind (A) /= N_Aggregate then |
| if Is_Overloaded (A) then |
| A_Type := Any_Type; |
| |
| Get_First_Interp (A, I, It); |
| while Present (It.Typ) loop |
| |
| -- Consider limited interpretations if Ada 2005 or higher |
| |
| if Is_Tagged_Type (It.Typ) |
| and then (Ada_Version >= Ada_2005 |
| or else not Is_Limited_Type (It.Typ)) |
| then |
| if A_Type /= Any_Type then |
| Error_Msg_N ("cannot resolve expression", A); |
| return; |
| else |
| A_Type := It.Typ; |
| end if; |
| end if; |
| |
| Get_Next_Interp (I, It); |
| end loop; |
| |
| if A_Type = Any_Type then |
| if Ada_Version >= Ada_2005 then |
| Error_Msg_N |
| ("ancestor part must be of a tagged type", A); |
| else |
| Error_Msg_N |
| ("ancestor part must be of a nonlimited tagged type", A); |
| end if; |
| |
| return; |
| end if; |
| |
| else |
| A_Type := Etype (A); |
| end if; |
| |
| if Valid_Ancestor_Type then |
| Resolve (A, A_Type); |
| Check_Unset_Reference (A); |
| Check_Non_Static_Context (A); |
| |
| -- The aggregate is illegal if the ancestor expression is a call |
| -- to a function with a limited unconstrained result, unless the |
| -- type of the aggregate is a null extension. This restriction |
| -- was added in AI05-67 to simplify implementation. |
| |
| if Nkind (A) = N_Function_Call |
| and then Is_Limited_Type (A_Type) |
| and then not Is_Null_Extension (Typ) |
| and then not Is_Constrained (A_Type) |
| then |
| Error_Msg_N |
| ("type of limited ancestor part must be constrained", A); |
| |
| -- Reject the use of CPP constructors that leave objects partially |
| -- initialized. For example: |
| |
| -- type CPP_Root is tagged limited record ... |
| -- pragma Import (CPP, CPP_Root); |
| |
| -- type CPP_DT is new CPP_Root and Iface ... |
| -- pragma Import (CPP, CPP_DT); |
| |
| -- type Ada_DT is new CPP_DT with ... |
| |
| -- Obj : Ada_DT := Ada_DT'(New_CPP_Root with others => <>); |
| |
| -- Using the constructor of CPP_Root the slots of the dispatch |
| -- table of CPP_DT cannot be set, and the secondary tag of |
| -- CPP_DT is unknown. |
| |
| elsif Nkind (A) = N_Function_Call |
| and then Is_CPP_Constructor_Call (A) |
| and then Enclosing_CPP_Parent (Typ) /= A_Type |
| then |
| Error_Msg_NE |
| ("??must use 'C'P'P constructor for type &", A, |
| Enclosing_CPP_Parent (Typ)); |
| |
| -- The following call is not needed if the previous warning |
| -- is promoted to an error. |
| |
| Resolve_Record_Aggregate (N, Typ); |
| |
| elsif Is_Class_Wide_Type (Etype (A)) |
| and then Nkind (Original_Node (A)) = N_Function_Call |
| then |
| -- If the ancestor part is a dispatching call, it appears |
| -- statically to be a legal ancestor, but it yields any member |
| -- of the class, and it is not possible to determine whether |
| -- it is an ancestor of the extension aggregate (much less |
| -- which ancestor). It is not possible to determine the |
| -- components of the extension part. |
| |
| -- This check implements AI-306, which in fact was motivated by |
| -- an AdaCore query to the ARG after this test was added. |
| |
| Error_Msg_N ("ancestor part must be statically tagged", A); |
| else |
| -- We are using the build-in-place protocol, but we can't build |
| -- in place, because we need to call the function before |
| -- allocating the aggregate. Could do better for null |
| -- extensions, and maybe for nondiscriminated types. |
| -- This is wrong for limited, but those were wrong already. |
| |
| if not Is_Limited_View (A_Type) |
| and then Is_Build_In_Place_Function_Call (A) |
| then |
| Transform_BIP_Assignment (A_Type); |
| end if; |
| |
| Resolve_Record_Aggregate (N, Typ); |
| end if; |
| end if; |
| |
| else |
| Error_Msg_N ("no unique type for this aggregate", A); |
| end if; |
| |
| Check_Function_Writable_Actuals (N); |
| end Resolve_Extension_Aggregate; |
| |
| ------------------------------ |
| -- Resolve_Record_Aggregate -- |
| ------------------------------ |
| |
| procedure Resolve_Record_Aggregate (N : Node_Id; Typ : Entity_Id) is |
| New_Assoc_List : constant List_Id := New_List; |
| -- New_Assoc_List is the newly built list of N_Component_Association |
| -- nodes. |
| |
| Others_Etype : Entity_Id := Empty; |
| -- This variable is used to save the Etype of the last record component |
| -- that takes its value from the others choice. Its purpose is: |
| -- |
| -- (a) make sure the others choice is useful |
| -- |
| -- (b) make sure the type of all the components whose value is |
| -- subsumed by the others choice are the same. |
| -- |
| -- This variable is updated as a side effect of function Get_Value. |
| |
| Box_Node : Node_Id := Empty; |
| Is_Box_Present : Boolean := False; |
| Others_Box : Integer := 0; |
| -- Ada 2005 (AI-287): Variables used in case of default initialization |
| -- to provide a functionality similar to Others_Etype. Box_Present |
| -- indicates that the component takes its default initialization; |
| -- Others_Box counts the number of components of the current aggregate |
| -- (which may be a sub-aggregate of a larger one) that are default- |
| -- initialized. A value of One indicates that an others_box is present. |
| -- Any larger value indicates that the others_box is not redundant. |
| -- These variables, similar to Others_Etype, are also updated as a side |
| -- effect of function Get_Value. Box_Node is used to place a warning on |
| -- a redundant others_box. |
| |
| procedure Add_Association |
| (Component : Entity_Id; |
| Expr : Node_Id; |
| Assoc_List : List_Id; |
| Is_Box_Present : Boolean := False); |
| -- Builds a new N_Component_Association node which associates Component |
| -- to expression Expr and adds it to the association list being built, |
| -- either New_Assoc_List, or the association being built for an inner |
| -- aggregate. |
| |
| procedure Add_Discriminant_Values |
| (New_Aggr : Node_Id; |
| Assoc_List : List_Id); |
| -- The constraint to a component may be given by a discriminant of the |
| -- enclosing type, in which case we have to retrieve its value, which is |
| -- part of the enclosing aggregate. Assoc_List provides the discriminant |
| -- associations of the current type or of some enclosing record. |
| |
| function Discriminant_Present (Input_Discr : Entity_Id) return Boolean; |
| -- If aggregate N is a regular aggregate this routine will return True. |
| -- Otherwise, if N is an extension aggregate, then Input_Discr denotes |
| -- a discriminant whose value may already have been specified by N's |
| -- ancestor part. This routine checks whether this is indeed the case |
| -- and if so returns False, signaling that no value for Input_Discr |
| -- should appear in N's aggregate part. Also, in this case, the routine |
| -- appends to New_Assoc_List the discriminant value specified in the |
| -- ancestor part. |
| -- |
| -- If the aggregate is in a context with expansion delayed, it will be |
| -- reanalyzed. The inherited discriminant values must not be reinserted |
| -- in the component list to prevent spurious errors, but they must be |
| -- present on first analysis to build the proper subtype indications. |
| -- The flag Inherited_Discriminant is used to prevent the re-insertion. |
| |
| function Find_Private_Ancestor (Typ : Entity_Id) return Entity_Id; |
| -- AI05-0115: Find earlier ancestor in the derivation chain that is |
| -- derived from private view Typ. Whether the aggregate is legal depends |
| -- on the current visibility of the type as well as that of the parent |
| -- of the ancestor. |
| |
| function Get_Value |
| (Compon : Node_Id; |
| From : List_Id; |
| Consider_Others_Choice : Boolean := False) return Node_Id; |
| -- Given a record component stored in parameter Compon, this function |
| -- returns its value as it appears in the list From, which is a list |
| -- of N_Component_Association nodes. |
| -- |
| -- If no component association has a choice for the searched component, |
| -- the value provided by the others choice is returned, if there is one, |
| -- and Consider_Others_Choice is set to true. Otherwise Empty is |
| -- returned. If there is more than one component association giving a |
| -- value for the searched record component, an error message is emitted |
| -- and the first found value is returned. |
| -- |
| -- If Consider_Others_Choice is set and the returned expression comes |
| -- from the others choice, then Others_Etype is set as a side effect. |
| -- An error message is emitted if the components taking their value from |
| -- the others choice do not have same type. |
| |
| procedure Propagate_Discriminants |
| (Aggr : Node_Id; |
| Assoc_List : List_Id); |
| -- Nested components may themselves be discriminated types constrained |
| -- by outer discriminants, whose values must be captured before the |
| -- aggregate is expanded into assignments. |
| |
| procedure Resolve_Aggr_Expr (Expr : Node_Id; Component : Entity_Id); |
| -- Analyzes and resolves expression Expr against the Etype of the |
| -- Component. This routine also applies all appropriate checks to Expr. |
| -- It finally saves a Expr in the newly created association list that |
| -- will be attached to the final record aggregate. Note that if the |
| -- Parent pointer of Expr is not set then Expr was produced with a |
| -- New_Copy_Tree or some such. |
| |
| procedure Rewrite_Range (Root_Type : Entity_Id; Rge : Node_Id); |
| -- Rewrite a range node Rge when its bounds refer to non-stored |
| -- discriminants from Root_Type, to replace them with the stored |
| -- discriminant values. This is required in GNATprove mode, and is |
| -- adopted in all modes to avoid special-casing GNATprove mode. |
| |
| --------------------- |
| -- Add_Association -- |
| --------------------- |
| |
| procedure Add_Association |
| (Component : Entity_Id; |
| Expr : Node_Id; |
| Assoc_List : List_Id; |
| Is_Box_Present : Boolean := False) |
| is |
| Choice_List : constant List_Id := New_List; |
| Loc : Source_Ptr; |
| |
| begin |
| -- If this is a box association the expression is missing, so use the |
| -- Sloc of the aggregate itself for the new association. |
| |
| if Present (Expr) then |
| Loc := Sloc (Expr); |
| else |
| Loc := Sloc (N); |
| end if; |
| |
| Append_To (Choice_List, New_Occurrence_Of (Component, Loc)); |
| |
| Append_To (Assoc_List, |
| Make_Component_Association (Loc, |
| Choices => Choice_List, |
| Expression => Expr, |
| Box_Present => Is_Box_Present)); |
| end Add_Association; |
| |
| ----------------------------- |
| -- Add_Discriminant_Values -- |
| ----------------------------- |
| |
| procedure Add_Discriminant_Values |
| (New_Aggr : Node_Id; |
| Assoc_List : List_Id) |
| is |
| Assoc : Node_Id; |
| Discr : Entity_Id; |
| Discr_Elmt : Elmt_Id; |
| Discr_Val : Node_Id; |
| Val : Entity_Id; |
| |
| begin |
| Discr := First_Discriminant (Etype (New_Aggr)); |
| Discr_Elmt := First_Elmt (Discriminant_Constraint (Etype (New_Aggr))); |
| while Present (Discr_Elmt) loop |
| Discr_Val := Node (Discr_Elmt); |
| |
| -- If the constraint is given by a discriminant then it is a |
| -- discriminant of an enclosing record, and its value has already |
| -- been placed in the association list. |
| |
| if Is_Entity_Name (Discr_Val) |
| and then Ekind (Entity (Discr_Val)) = E_Discriminant |
| then |
| Val := Entity (Discr_Val); |
| |
| Assoc := First (Assoc_List); |
| while Present (Assoc) loop |
| if Present (Entity (First (Choices (Assoc)))) |
| and then Entity (First (Choices (Assoc))) = Val |
| then |
| Discr_Val := Expression (Assoc); |
| exit; |
| end if; |
| |
| Next (Assoc); |
| end loop; |
| end if; |
| |
| Add_Association |
| (Discr, New_Copy_Tree (Discr_Val), |
| Component_Associations (New_Aggr)); |
| |
| -- If the discriminant constraint is a current instance, mark the |
| -- current aggregate so that the self-reference can be expanded |
| -- later. The constraint may refer to the subtype of aggregate, so |
| -- use base type for comparison. |
| |
| if Nkind (Discr_Val) = N_Attribute_Reference |
| and then Is_Entity_Name (Prefix (Discr_Val)) |
| and then Is_Type (Entity (Prefix (Discr_Val))) |
| and then Base_Type (Etype (N)) = Entity (Prefix (Discr_Val)) |
| then |
| Set_Has_Self_Reference (N); |
| end if; |
| |
| Next_Elmt (Discr_Elmt); |
| Next_Discriminant (Discr); |
| end loop; |
| end Add_Discriminant_Values; |
| |
| -------------------------- |
| -- Discriminant_Present -- |
| -------------------------- |
| |
| function Discriminant_Present (Input_Discr : Entity_Id) return Boolean is |
| Regular_Aggr : constant Boolean := Nkind (N) /= N_Extension_Aggregate; |
| |
| Ancestor_Is_Subtyp : Boolean; |
| |
| Loc : Source_Ptr; |
| |
| Ancestor : Node_Id; |
| Ancestor_Typ : Entity_Id; |
| Comp_Assoc : Node_Id; |
| Discr : Entity_Id; |
| Discr_Expr : Node_Id; |
| Discr_Val : Elmt_Id := No_Elmt; |
| Orig_Discr : Entity_Id; |
| |
| begin |
| if Regular_Aggr then |
| return True; |
| end if; |
| |
| -- Check whether inherited discriminant values have already been |
| -- inserted in the aggregate. This will be the case if we are |
| -- re-analyzing an aggregate whose expansion was delayed. |
| |
| if Present (Component_Associations (N)) then |
| Comp_Assoc := First (Component_Associations (N)); |
| while Present (Comp_Assoc) loop |
| if Inherited_Discriminant (Comp_Assoc) then |
| return True; |
| end if; |
| |
| Next (Comp_Assoc); |
| end loop; |
| end if; |
| |
| Ancestor := Ancestor_Part (N); |
| Ancestor_Typ := Etype (Ancestor); |
| Loc := Sloc (Ancestor); |
| |
| -- For a private type with unknown discriminants, use the underlying |
| -- record view if it is available. |
| |
| if Has_Unknown_Discriminants (Ancestor_Typ) |
| and then Present (Full_View (Ancestor_Typ)) |
| and then Present (Underlying_Record_View (Full_View (Ancestor_Typ))) |
| then |
| Ancestor_Typ := Underlying_Record_View (Full_View (Ancestor_Typ)); |
| end if; |
| |
| Ancestor_Is_Subtyp := |
| Is_Entity_Name (Ancestor) and then Is_Type (Entity (Ancestor)); |
| |
| -- If the ancestor part has no discriminants clearly N's aggregate |
| -- part must provide a value for Discr. |
| |
| if not Has_Discriminants (Ancestor_Typ) then |
| return True; |
| |
| -- If the ancestor part is an unconstrained subtype mark then the |
| -- Discr must be present in N's aggregate part. |
| |
| elsif Ancestor_Is_Subtyp |
| and then not Is_Constrained (Entity (Ancestor)) |
| then |
| return True; |
| end if; |
| |
| -- Now look to see if Discr was specified in the ancestor part |
| |
| if Ancestor_Is_Subtyp then |
| Discr_Val := |
| First_Elmt (Discriminant_Constraint (Entity (Ancestor))); |
| end if; |
| |
| Orig_Discr := Original_Record_Component (Input_Discr); |
| |
| Discr := First_Discriminant (Ancestor_Typ); |
| while Present (Discr) loop |
| |
| -- If Ancestor has already specified Disc value then insert its |
| -- value in the final aggregate. |
| |
| if Original_Record_Component (Discr) = Orig_Discr then |
| if Ancestor_Is_Subtyp then |
| Discr_Expr := New_Copy_Tree (Node (Discr_Val)); |
| else |
| Discr_Expr := |
| Make_Selected_Component (Loc, |
| Prefix => Duplicate_Subexpr (Ancestor), |
| Selector_Name => New_Occurrence_Of (Input_Discr, Loc)); |
| end if; |
| |
| Resolve_Aggr_Expr (Discr_Expr, Input_Discr); |
| Set_Inherited_Discriminant (Last (New_Assoc_List)); |
| return False; |
| end if; |
| |
| Next_Discriminant (Discr); |
| |
| if Ancestor_Is_Subtyp then |
| Next_Elmt (Discr_Val); |
| end if; |
| end loop; |
| |
| return True; |
| end Discriminant_Present; |
| |
| --------------------------- |
| -- Find_Private_Ancestor -- |
| --------------------------- |
| |
| function Find_Private_Ancestor (Typ : Entity_Id) return Entity_Id is |
| Par : Entity_Id; |
| |
| begin |
| Par := Typ; |
| loop |
| if Has_Private_Ancestor (Par) |
| and then not Has_Private_Ancestor (Etype (Base_Type (Par))) |
| then |
| return Par; |
| |
| elsif not Is_Derived_Type (Par) then |
| return Empty; |
| |
| else |
| Par := Etype (Base_Type (Par)); |
| end if; |
| end loop; |
| end Find_Private_Ancestor; |
| |
| --------------- |
| -- Get_Value -- |
| --------------- |
| |
| function Get_Value |
| (Compon : Node_Id; |
| From : List_Id; |
| Consider_Others_Choice : Boolean := False) return Node_Id |
| is |
| Typ : constant Entity_Id := Etype (Compon); |
| Assoc : Node_Id; |
| Expr : Node_Id := Empty; |
| Selector_Name : Node_Id; |
| |
| begin |
| Is_Box_Present := False; |
| |
| if No (From) then |
| return Empty; |
| end if; |
| |
| Assoc := First (From); |
| while Present (Assoc) loop |
| Selector_Name := First (Choices (Assoc)); |
| while Present (Selector_Name) loop |
| if Nkind (Selector_Name) = N_Others_Choice then |
| if Consider_Others_Choice and then No (Expr) then |
| |
| -- We need to duplicate the expression for each |
| -- successive component covered by the others choice. |
| -- This is redundant if the others_choice covers only |
| -- one component (small optimization possible???), but |
| -- indispensable otherwise, because each one must be |
| -- expanded individually to preserve side effects. |
| |
| -- Ada 2005 (AI-287): In case of default initialization |
| -- of components, we duplicate the corresponding default |
| -- expression (from the record type declaration). The |
| -- copy must carry the sloc of the association (not the |
| -- original expression) to prevent spurious elaboration |
| -- checks when the default includes function calls. |
| |
| if Box_Present (Assoc) then |
| Others_Box := Others_Box + 1; |
| Is_Box_Present := True; |
| |
| if Expander_Active then |
| return |
| New_Copy_Tree_And_Copy_Dimensions |
| (Expression (Parent (Compon)), |
| New_Sloc => Sloc (Assoc)); |
| else |
| return Expression (Parent (Compon)); |
| end if; |
| |
| else |
| if Present (Others_Etype) |
| and then Base_Type (Others_Etype) /= Base_Type (Typ) |
| then |
| -- If the components are of an anonymous access |
| -- type they are distinct, but this is legal in |
| -- Ada 2012 as long as designated types match. |
| |
| if (Ekind (Typ) = E_Anonymous_Access_Type |
| or else Ekind (Typ) = |
| E_Anonymous_Access_Subprogram_Type) |
| and then Designated_Type (Typ) = |
| Designated_Type (Others_Etype) |
| then |
| null; |
| else |
| Error_Msg_N |
| ("components in OTHERS choice must have same " |
| & "type", Selector_Name); |
| end if; |
| end if; |
| |
| Others_Etype := Typ; |
| |
| -- Copy the expression so that it is resolved |
| -- independently for each component, This is needed |
| -- for accessibility checks on compoents of anonymous |
| -- access types, even in compile_only mode. |
| |
| if not Inside_A_Generic then |
| |
| -- In ASIS mode, preanalyze the expression in an |
| -- others association before making copies for |
| -- separate resolution and accessibility checks. |
| -- This ensures that the type of the expression is |
| -- available to ASIS in all cases, in particular if |
| -- the expression is itself an aggregate. |
| |
| if ASIS_Mode then |
| Preanalyze_And_Resolve (Expression (Assoc), Typ); |
| end if; |
| |
| return |
| New_Copy_Tree_And_Copy_Dimensions |
| (Expression (Assoc)); |
| |
| else |
| return Expression (Assoc); |
| end if; |
| end if; |
| end if; |
| |
| elsif Chars (Compon) = Chars (Selector_Name) then |
| if No (Expr) then |
| |
| -- Ada 2005 (AI-231) |
| |
| if Ada_Version >= Ada_2005 |
| and then Known_Null (Expression (Assoc)) |
| then |
| Check_Can_Never_Be_Null (Compon, Expression (Assoc)); |
| end if; |
| |
| -- We need to duplicate the expression when several |
| -- components are grouped together with a "|" choice. |
| -- For instance "filed1 | filed2 => Expr" |
| |
| -- Ada 2005 (AI-287) |
| |
| if Box_Present (Assoc) then |
| Is_Box_Present := True; |
| |
| -- Duplicate the default expression of the component |
| -- from the record type declaration, so a new copy |
| -- can be attached to the association. |
| |
| -- Note that we always copy the default expression, |
| -- even when the association has a single choice, in |
| -- order to create a proper association for the |
| -- expanded aggregate. |
| |
| -- Component may have no default, in which case the |
| -- expression is empty and the component is default- |
| -- initialized, but an association for the component |
| -- exists, and it is not covered by an others clause. |
| |
| -- Scalar and private types have no initialization |
| -- procedure, so they remain uninitialized. If the |
| -- target of the aggregate is a constant this |
| -- deserves a warning. |
| |
| if No (Expression (Parent (Compon))) |
| and then not Has_Non_Null_Base_Init_Proc (Typ) |
| and then not Has_Aspect (Typ, Aspect_Default_Value) |
| and then not Is_Concurrent_Type (Typ) |
| and then Nkind (Parent (N)) = N_Object_Declaration |
| and then Constant_Present (Parent (N)) |
| then |
| Error_Msg_Node_2 := Typ; |
| Error_Msg_NE |
| ("component&? of type& is uninitialized", |
| Assoc, Selector_Name); |
| |
| -- An additional reminder if the component type |
| -- is a generic formal. |
| |
| if Is_Generic_Type (Base_Type (Typ)) then |
| Error_Msg_NE |
| ("\instance should provide actual type with " |
| & "initialization for&", Assoc, Typ); |
| end if; |
| end if; |
| |
| return |
| New_Copy_Tree_And_Copy_Dimensions |
| (Expression (Parent (Compon))); |
| |
| else |
| if Present (Next (Selector_Name)) then |
| Expr := New_Copy_Tree_And_Copy_Dimensions |
| (Expression (Assoc)); |
| else |
| Expr := Expression (Assoc); |
| end if; |
| end if; |
| |
| Generate_Reference (Compon, Selector_Name, 'm'); |
| |
| else |
| Error_Msg_NE |
| ("more than one value supplied for &", |
| Selector_Name, Compon); |
| |
| end if; |
| end if; |
| |
| Next (Selector_Name); |
| end loop; |
| |
| Next (Assoc); |
| end loop; |
| |
| return Expr; |
| end Get_Value; |
| |
| ----------------------------- |
| -- Propagate_Discriminants -- |
| ----------------------------- |
| |
| procedure Propagate_Discriminants |
| (Aggr : Node_Id; |
| Assoc_List : List_Id) |
| is |
| Loc : constant Source_Ptr := Sloc (N); |
| |
| Needs_Box : Boolean := False; |
| |
| procedure Process_Component (Comp : Entity_Id); |
| -- Add one component with a box association to the inner aggregate, |
| -- and recurse if component is itself composite. |
| |
| ----------------------- |
| -- Process_Component -- |
| ----------------------- |
| |
| procedure Process_Component (Comp : Entity_Id) is |
| T : constant Entity_Id := Etype (Comp); |
| New_Aggr : Node_Id; |
| |
| begin |
| if Is_Record_Type (T) and then Has_Discriminants (T) then |
| New_Aggr := Make_Aggregate (Loc, New_List, New_List); |
| Set_Etype (New_Aggr, T); |
| |
| Add_Association |
| (Comp, New_Aggr, Component_Associations (Aggr)); |
| |
| -- Collect discriminant values and recurse |
| |
| Add_Discriminant_Values (New_Aggr, Assoc_List); |
| Propagate_Discriminants (New_Aggr, Assoc_List); |
| |
| else |
| Needs_Box := True; |
| end if; |
| end Process_Component; |
| |
| -- Local variables |
| |
| Aggr_Type : constant Entity_Id := Base_Type (Etype (Aggr)); |
| Components : constant Elist_Id := New_Elmt_List; |
| Def_Node : constant Node_Id := |
| Type_Definition (Declaration_Node (Aggr_Type)); |
| |
| Comp : Node_Id; |
| Comp_Elmt : Elmt_Id; |
| Errors : Boolean; |
| |
| -- Start of processing for Propagate_Discriminants |
| |
| begin |
| -- The component type may be a variant type. Collect the components |
| -- that are ruled by the known values of the discriminants. Their |
| -- values have already been inserted into the component list of the |
| -- current aggregate. |
| |
| if Nkind (Def_Node) = N_Record_Definition |
| and then Present (Component_List (Def_Node)) |
| and then Present (Variant_Part (Component_List (Def_Node))) |
| then |
| Gather_Components (Aggr_Type, |
| Component_List (Def_Node), |
| Governed_By => Component_Associations (Aggr), |
| Into => Components, |
| Report_Errors => Errors); |
| |
| Comp_Elmt := First_Elmt (Components); |
| while Present (Comp_Elmt) loop |
| if Ekind (Node (Comp_Elmt)) /= E_Discriminant then |
| Process_Component (Node (Comp_Elmt)); |
| end if; |
| |
| Next_Elmt (Comp_Elmt); |
| end loop; |
| |
| -- No variant part, iterate over all components |
| |
| else |
| Comp := First_Component (Etype (Aggr)); |
| while Present (Comp) loop |
| Process_Component (Comp); |
| Next_Component (Comp); |
| end loop; |
| end if; |
| |
| if Needs_Box then |
| Append_To (Component_Associations (Aggr), |
| Make_Component_Association (Loc, |
| Choices => New_List (Make_Others_Choice (Loc)), |
| Expression => Empty, |
| Box_Present => True)); |
| end if; |
| end Propagate_Discriminants; |
| |
| ----------------------- |
| -- Resolve_Aggr_Expr -- |
| ----------------------- |
| |
| procedure Resolve_Aggr_Expr (Expr : Node_Id; Component : Entity_Id) is |
| function Has_Expansion_Delayed (Expr : Node_Id) return Boolean; |
| -- If the expression is an aggregate (possibly qualified) then its |
| -- expansion is delayed until the enclosing aggregate is expanded |
| -- into assignments. In that case, do not generate checks on the |
| -- expression, because they will be generated later, and will other- |
| -- wise force a copy (to remove side effects) that would leave a |
| -- dynamic-sized aggregate in the code, something that gigi cannot |
| -- handle. |
| |
| --------------------------- |
| -- Has_Expansion_Delayed -- |
| --------------------------- |
| |
| function Has_Expansion_Delayed (Expr : Node_Id) return Boolean is |
| begin |
| return |
| (Nkind_In (Expr, N_Aggregate, N_Extension_Aggregate) |
| and then Present (Etype (Expr)) |
| and then Is_Record_Type (Etype (Expr)) |
| and then Expansion_Delayed (Expr)) |
| or else |
| (Nkind (Expr) = N_Qualified_Expression |
| and then Has_Expansion_Delayed (Expression (Expr))); |
| end Has_Expansion_Delayed; |
| |
| -- Local variables |
| |
| Expr_Type : Entity_Id := Empty; |
| New_C : Entity_Id := Component; |
| New_Expr : Node_Id; |
| |
| Relocate : Boolean; |
| -- Set to True if the resolved Expr node needs to be relocated when |
| -- attached to the newly created association list. This node need not |
| -- be relocated if its parent pointer is not set. In fact in this |
| -- case Expr is the output of a New_Copy_Tree call. If Relocate is |
| -- True then we have analyzed the expression node in the original |
| -- aggregate and hence it needs to be relocated when moved over to |
| -- the new association list. |
| |
| -- Start of processing for Resolve_Aggr_Expr |
| |
| begin |
| -- If the type of the component is elementary or the type of the |
| -- aggregate does not contain discriminants, use the type of the |
| -- component to resolve Expr. |
| |
| if Is_Elementary_Type (Etype (Component)) |
| or else not Has_Discriminants (Etype (N)) |
| then |
| Expr_Type := Etype (Component); |
| |
| -- Otherwise we have to pick up the new type of the component from |
| -- the new constrained subtype of the aggregate. In fact components |
| -- which are of a composite type might be constrained by a |
| -- discriminant, and we want to resolve Expr against the subtype were |
| -- all discriminant occurrences are replaced with their actual value. |
| |
| else |
| New_C := First_Component (Etype (N)); |
| while Present (New_C) loop |
| if Chars (New_C) = Chars (Component) then |
| Expr_Type := Etype (New_C); |
| exit; |
| end if; |
| |
| Next_Component (New_C); |
| end loop; |
| |
| pragma Assert (Present (Expr_Type)); |
| |
| -- For each range in an array type where a discriminant has been |
| -- replaced with the constraint, check that this range is within |
| -- the range of the base type. This checks is done in the init |
| -- proc for regular objects, but has to be done here for |
| -- aggregates since no init proc is called for them. |
| |
| if Is_Array_Type (Expr_Type) then |
| declare |
| Index : Node_Id; |
| -- Range of the current constrained index in the array |
| |
| Orig_Index : Node_Id := First_Index (Etype (Component)); |
| -- Range corresponding to the range Index above in the |
| -- original unconstrained record type. The bounds of this |
| -- range may be governed by discriminants. |
| |
| Unconstr_Index : Node_Id := First_Index (Etype (Expr_Type)); |
| -- Range corresponding to the range Index above for the |
| -- unconstrained array type. This range is needed to apply |
| -- range checks. |
| |
| begin |
| Index := First_Index (Expr_Type); |
| while Present (Index) loop |
| if Depends_On_Discriminant (Orig_Index) then |
| Apply_Range_Check (Index, Etype (Unconstr_Index)); |
| end if; |
| |
| Next_Index (Index); |
| Next_Index (Orig_Index); |
| Next_Index (Unconstr_Index); |
| end loop; |
| end; |
| end if; |
| end if; |
| |
| -- If the Parent pointer of Expr is not set, Expr is an expression |
| -- duplicated by New_Tree_Copy (this happens for record aggregates |
| -- that look like (Field1 | Filed2 => Expr) or (others => Expr)). |
| -- Such a duplicated expression must be attached to the tree |
| -- before analysis and resolution to enforce the rule that a tree |
| -- fragment should never be analyzed or resolved unless it is |
| -- attached to the current compilation unit. |
| |
| if No (Parent (Expr)) then |
| Set_Parent (Expr, N); |
| Relocate := False; |
| else |
| Relocate := True; |
| end if; |
| |
| Analyze_And_Resolve (Expr, Expr_Type); |
| Check_Expr_OK_In_Limited_Aggregate (Expr); |
| Check_Non_Static_Context (Expr); |
| Check_Unset_Reference (Expr); |
| |
| -- Check wrong use of class-wide types |
| |
| if Is_Class_Wide_Type (Etype (Expr)) then |
| Error_Msg_N ("dynamically tagged expression not allowed", Expr); |
| end if; |
| |
| if not Has_Expansion_Delayed (Expr) then |
| Aggregate_Constraint_Checks (Expr, Expr_Type); |
| end if; |
| |
| -- If an aggregate component has a type with predicates, an explicit |
| -- predicate check must be applied, as for an assignment statement, |
| -- because the aggegate might not be expanded into individual |
| -- component assignments. |
| |
| if Has_Predicates (Expr_Type) |
| and then Analyzed (Expr) |
| then |
| Apply_Predicate_Check (Expr, Expr_Type); |
| end if; |
| |
| if Raises_Constraint_Error (Expr) then |
| Set_Raises_Constraint_Error (N); |
| end if; |
| |
| -- If the expression has been marked as requiring a range check, then |
| -- generate it here. It's a bit odd to be generating such checks in |
| -- the analyzer, but harmless since Generate_Range_Check does nothing |
| -- (other than making sure Do_Range_Check is set) if the expander is |
| -- not active. |
| |
| if Do_Range_Check (Expr) then |
| Generate_Range_Check (Expr, Expr_Type, CE_Range_Check_Failed); |
| end if; |
| |
| -- Add association Component => Expr if the caller requests it |
| |
| if Relocate then |
| New_Expr := Relocate_Node (Expr); |
| |
| -- Since New_Expr is not gonna be analyzed later on, we need to |
| |