1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2010, Free Software Foundation, Inc. --
11 -- GNAT is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 3, or (at your option) any later ver- --
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNAT; see file COPYING3. If not, go to --
19 -- http://www.gnu.org/licenses for a complete copy of the license. --
21 -- GNAT was originally developed by the GNAT team at New York University. --
22 -- Extensive contributions were provided by Ada Core Technologies Inc. --
24 ------------------------------------------------------------------------------
26 with Atree
; use Atree
;
27 with Checks
; use Checks
;
28 with Debug
; use Debug
;
29 with Einfo
; use Einfo
;
30 with Elists
; use Elists
;
31 with Errout
; use Errout
;
32 with Expander
; use Expander
;
33 with Exp_Util
; use Exp_Util
;
34 with Exp_Ch3
; use Exp_Ch3
;
35 with Exp_Ch7
; use Exp_Ch7
;
36 with Exp_Ch9
; use Exp_Ch9
;
37 with Exp_Disp
; use Exp_Disp
;
38 with Exp_Tss
; use Exp_Tss
;
39 with Fname
; use Fname
;
40 with Freeze
; use Freeze
;
41 with Itypes
; use Itypes
;
43 with Namet
; use Namet
;
44 with Nmake
; use Nmake
;
45 with Nlists
; use Nlists
;
47 with Restrict
; use Restrict
;
48 with Rident
; use Rident
;
49 with Rtsfind
; use Rtsfind
;
50 with Ttypes
; use Ttypes
;
52 with Sem_Aux
; use Sem_Aux
;
53 with Sem_Ch3
; use Sem_Ch3
;
54 with Sem_Eval
; use Sem_Eval
;
55 with Sem_Res
; use Sem_Res
;
56 with Sem_Util
; use Sem_Util
;
57 with Sinfo
; use Sinfo
;
58 with Snames
; use Snames
;
59 with Stand
; use Stand
;
60 with Targparm
; use Targparm
;
61 with Tbuild
; use Tbuild
;
62 with Uintp
; use Uintp
;
64 package body Exp_Aggr
is
66 type Case_Bounds
is record
69 Choice_Node
: Node_Id
;
72 type Case_Table_Type
is array (Nat
range <>) of Case_Bounds
;
73 -- Table type used by Check_Case_Choices procedure
76 (Obj_Type
: Entity_Id
;
77 Typ
: Entity_Id
) return Boolean;
78 -- A static array aggregate in an object declaration can in most cases be
79 -- expanded in place. The one exception is when the aggregate is given
80 -- with component associations that specify different bounds from those of
81 -- the type definition in the object declaration. In this pathological
82 -- case the aggregate must slide, and we must introduce an intermediate
83 -- temporary to hold it.
85 -- The same holds in an assignment to one-dimensional array of arrays,
86 -- when a component may be given with bounds that differ from those of the
89 procedure Sort_Case_Table
(Case_Table
: in out Case_Table_Type
);
90 -- Sort the Case Table using the Lower Bound of each Choice as the key.
91 -- A simple insertion sort is used since the number of choices in a case
92 -- statement of variant part will usually be small and probably in near
95 function Has_Default_Init_Comps
(N
: Node_Id
) return Boolean;
96 -- N is an aggregate (record or array). Checks the presence of default
97 -- initialization (<>) in any component (Ada 2005: AI-287).
99 function Is_Static_Dispatch_Table_Aggregate
(N
: Node_Id
) return Boolean;
100 -- Returns true if N is an aggregate used to initialize the components
101 -- of an statically allocated dispatch table.
103 ------------------------------------------------------
104 -- Local subprograms for Record Aggregate Expansion --
105 ------------------------------------------------------
107 procedure Expand_Record_Aggregate
109 Orig_Tag
: Node_Id
:= Empty
;
110 Parent_Expr
: Node_Id
:= Empty
);
111 -- This is the top level procedure for record aggregate expansion.
112 -- Expansion for record aggregates needs expand aggregates for tagged
113 -- record types. Specifically Expand_Record_Aggregate adds the Tag
114 -- field in front of the Component_Association list that was created
115 -- during resolution by Resolve_Record_Aggregate.
117 -- N is the record aggregate node.
118 -- Orig_Tag is the value of the Tag that has to be provided for this
119 -- specific aggregate. It carries the tag corresponding to the type
120 -- of the outermost aggregate during the recursive expansion
121 -- Parent_Expr is the ancestor part of the original extension
124 procedure Convert_To_Assignments
(N
: Node_Id
; Typ
: Entity_Id
);
125 -- N is an N_Aggregate or an N_Extension_Aggregate. Typ is the type of the
126 -- aggregate (which can only be a record type, this procedure is only used
127 -- for record types). Transform the given aggregate into a sequence of
128 -- assignments performed component by component.
130 function Build_Record_Aggr_Code
134 Flist
: Node_Id
:= Empty
;
135 Obj
: Entity_Id
:= Empty
;
136 Is_Limited_Ancestor_Expansion
: Boolean := False) return List_Id
;
137 -- N is an N_Aggregate or an N_Extension_Aggregate. Typ is the type of the
138 -- aggregate. Target is an expression containing the location on which the
139 -- component by component assignments will take place. Returns the list of
140 -- assignments plus all other adjustments needed for tagged and controlled
141 -- types. Flist is an expression representing the finalization list on
142 -- which to attach the controlled components if any. Obj is present in the
143 -- object declaration and dynamic allocation cases, it contains an entity
144 -- that allows to know if the value being created needs to be attached to
145 -- the final list in case of pragma Finalize_Storage_Only.
148 -- The meaning of the Obj formal is extremely unclear. *What* entity
149 -- should be passed? For the object declaration case we may guess that
150 -- this is the object being declared, but what about the allocator case?
152 -- Is_Limited_Ancestor_Expansion indicates that the function has been
153 -- called recursively to expand the limited ancestor to avoid copying it.
155 function Has_Mutable_Components
(Typ
: Entity_Id
) return Boolean;
156 -- Return true if one of the component is of a discriminated type with
157 -- defaults. An aggregate for a type with mutable components must be
158 -- expanded into individual assignments.
160 procedure Initialize_Discriminants
(N
: Node_Id
; Typ
: Entity_Id
);
161 -- If the type of the aggregate is a type extension with renamed discrimi-
162 -- nants, we must initialize the hidden discriminants of the parent.
163 -- Otherwise, the target object must not be initialized. The discriminants
164 -- are initialized by calling the initialization procedure for the type.
165 -- This is incorrect if the initialization of other components has any
166 -- side effects. We restrict this call to the case where the parent type
167 -- has a variant part, because this is the only case where the hidden
168 -- discriminants are accessed, namely when calling discriminant checking
169 -- functions of the parent type, and when applying a stream attribute to
170 -- an object of the derived type.
172 -----------------------------------------------------
173 -- Local Subprograms for Array Aggregate Expansion --
174 -----------------------------------------------------
176 function Aggr_Size_OK
(N
: Node_Id
; Typ
: Entity_Id
) return Boolean;
177 -- Very large static aggregates present problems to the back-end, and are
178 -- transformed into assignments and loops. This function verifies that the
179 -- total number of components of an aggregate is acceptable for rewriting
180 -- into a purely positional static form. Aggr_Size_OK must be called before
183 -- This function also detects and warns about one-component aggregates that
184 -- appear in a non-static context. Even if the component value is static,
185 -- such an aggregate must be expanded into an assignment.
187 procedure Convert_Array_Aggr_In_Allocator
191 -- If the aggregate appears within an allocator and can be expanded in
192 -- place, this routine generates the individual assignments to components
193 -- of the designated object. This is an optimization over the general
194 -- case, where a temporary is first created on the stack and then used to
195 -- construct the allocated object on the heap.
197 procedure Convert_To_Positional
199 Max_Others_Replicate
: Nat
:= 5;
200 Handle_Bit_Packed
: Boolean := False);
201 -- If possible, convert named notation to positional notation. This
202 -- conversion is possible only in some static cases. If the conversion is
203 -- possible, then N is rewritten with the analyzed converted aggregate.
204 -- The parameter Max_Others_Replicate controls the maximum number of
205 -- values corresponding to an others choice that will be converted to
206 -- positional notation (the default of 5 is the normal limit, and reflects
207 -- the fact that normally the loop is better than a lot of separate
208 -- assignments). Note that this limit gets overridden in any case if
209 -- either of the restrictions No_Elaboration_Code or No_Implicit_Loops is
210 -- set. The parameter Handle_Bit_Packed is usually set False (since we do
211 -- not expect the back end to handle bit packed arrays, so the normal case
212 -- of conversion is pointless), but in the special case of a call from
213 -- Packed_Array_Aggregate_Handled, we set this parameter to True, since
214 -- these are cases we handle in there.
216 procedure Expand_Array_Aggregate
(N
: Node_Id
);
217 -- This is the top-level routine to perform array aggregate expansion.
218 -- N is the N_Aggregate node to be expanded.
220 function Backend_Processing_Possible
(N
: Node_Id
) return Boolean;
221 -- This function checks if array aggregate N can be processed directly
222 -- by the backend. If this is the case True is returned.
224 function Build_Array_Aggr_Code
229 Scalar_Comp
: Boolean;
230 Indexes
: List_Id
:= No_List
;
231 Flist
: Node_Id
:= Empty
) return List_Id
;
232 -- This recursive routine returns a list of statements containing the
233 -- loops and assignments that are needed for the expansion of the array
236 -- N is the (sub-)aggregate node to be expanded into code. This node
237 -- has been fully analyzed, and its Etype is properly set.
239 -- Index is the index node corresponding to the array sub-aggregate N.
241 -- Into is the target expression into which we are copying the aggregate.
242 -- Note that this node may not have been analyzed yet, and so the Etype
243 -- field may not be set.
245 -- Scalar_Comp is True if the component type of the aggregate is scalar.
247 -- Indexes is the current list of expressions used to index the
248 -- object we are writing into.
250 -- Flist is an expression representing the finalization list on which
251 -- to attach the controlled components if any.
253 function Number_Of_Choices
(N
: Node_Id
) return Nat
;
254 -- Returns the number of discrete choices (not including the others choice
255 -- if present) contained in (sub-)aggregate N.
257 function Late_Expansion
261 Flist
: Node_Id
:= Empty
;
262 Obj
: Entity_Id
:= Empty
) return List_Id
;
263 -- N is a nested (record or array) aggregate that has been marked with
264 -- 'Delay_Expansion'. Typ is the expected type of the aggregate and Target
265 -- is a (duplicable) expression that will hold the result of the aggregate
266 -- expansion. Flist is the finalization list to be used to attach
267 -- controlled components. 'Obj' when non empty, carries the original
268 -- object being initialized in order to know if it needs to be attached to
269 -- the previous parameter which may not be the case in the case where
270 -- Finalize_Storage_Only is set. Basically this procedure is used to
271 -- implement top-down expansions of nested aggregates. This is necessary
272 -- for avoiding temporaries at each level as well as for propagating the
273 -- right internal finalization list.
275 function Make_OK_Assignment_Statement
278 Expression
: Node_Id
) return Node_Id
;
279 -- This is like Make_Assignment_Statement, except that Assignment_OK
280 -- is set in the left operand. All assignments built by this unit
281 -- use this routine. This is needed to deal with assignments to
282 -- initialized constants that are done in place.
284 function Packed_Array_Aggregate_Handled
(N
: Node_Id
) return Boolean;
285 -- Given an array aggregate, this function handles the case of a packed
286 -- array aggregate with all constant values, where the aggregate can be
287 -- evaluated at compile time. If this is possible, then N is rewritten
288 -- to be its proper compile time value with all the components properly
289 -- assembled. The expression is analyzed and resolved and True is
290 -- returned. If this transformation is not possible, N is unchanged
291 -- and False is returned
293 function Safe_Slice_Assignment
(N
: Node_Id
) return Boolean;
294 -- If a slice assignment has an aggregate with a single others_choice,
295 -- the assignment can be done in place even if bounds are not static,
296 -- by converting it into a loop over the discrete range of the slice.
302 function Aggr_Size_OK
(N
: Node_Id
; Typ
: Entity_Id
) return Boolean is
310 -- The following constant determines the maximum size of an
311 -- array aggregate produced by converting named to positional
312 -- notation (e.g. from others clauses). This avoids running
313 -- away with attempts to convert huge aggregates, which hit
314 -- memory limits in the backend.
316 -- The normal limit is 5000, but we increase this limit to
317 -- 2**24 (about 16 million) if Restrictions (No_Elaboration_Code)
318 -- or Restrictions (No_Implicit_Loops) is specified, since in
319 -- either case, we are at risk of declaring the program illegal
320 -- because of this limit.
322 Max_Aggr_Size
: constant Nat
:=
323 5000 + (2 ** 24 - 5000) *
325 (Restriction_Active
(No_Elaboration_Code
)
327 Restriction_Active
(No_Implicit_Loops
));
329 function Component_Count
(T
: Entity_Id
) return Int
;
330 -- The limit is applied to the total number of components that the
331 -- aggregate will have, which is the number of static expressions
332 -- that will appear in the flattened array. This requires a recursive
333 -- computation of the number of scalar components of the structure.
335 ---------------------
336 -- Component_Count --
337 ---------------------
339 function Component_Count
(T
: Entity_Id
) return Int
is
344 if Is_Scalar_Type
(T
) then
347 elsif Is_Record_Type
(T
) then
348 Comp
:= First_Component
(T
);
349 while Present
(Comp
) loop
350 Res
:= Res
+ Component_Count
(Etype
(Comp
));
351 Next_Component
(Comp
);
356 elsif Is_Array_Type
(T
) then
358 Lo
: constant Node_Id
:=
359 Type_Low_Bound
(Etype
(First_Index
(T
)));
360 Hi
: constant Node_Id
:=
361 Type_High_Bound
(Etype
(First_Index
(T
)));
363 Siz
: constant Int
:= Component_Count
(Component_Type
(T
));
366 if not Compile_Time_Known_Value
(Lo
)
367 or else not Compile_Time_Known_Value
(Hi
)
372 Siz
* UI_To_Int
(Expr_Value
(Hi
) - Expr_Value
(Lo
) + 1);
377 -- Can only be a null for an access type
383 -- Start of processing for Aggr_Size_OK
386 Siz
:= Component_Count
(Component_Type
(Typ
));
388 Indx
:= First_Index
(Typ
);
389 while Present
(Indx
) loop
390 Lo
:= Type_Low_Bound
(Etype
(Indx
));
391 Hi
:= Type_High_Bound
(Etype
(Indx
));
393 -- Bounds need to be known at compile time
395 if not Compile_Time_Known_Value
(Lo
)
396 or else not Compile_Time_Known_Value
(Hi
)
401 Lov
:= Expr_Value
(Lo
);
402 Hiv
:= Expr_Value
(Hi
);
404 -- A flat array is always safe
410 -- One-component aggregates are suspicious, and if the context type
411 -- is an object declaration with non-static bounds it will trip gcc;
412 -- such an aggregate must be expanded into a single assignment.
415 and then Nkind
(Parent
(N
)) = N_Object_Declaration
418 Index_Type
: constant Entity_Id
:=
421 (Etype
(Defining_Identifier
(Parent
(N
)))));
425 if not Compile_Time_Known_Value
(Type_Low_Bound
(Index_Type
))
426 or else not Compile_Time_Known_Value
427 (Type_High_Bound
(Index_Type
))
429 if Present
(Component_Associations
(N
)) then
431 First
(Choices
(First
(Component_Associations
(N
))));
432 if Is_Entity_Name
(Indx
)
433 and then not Is_Type
(Entity
(Indx
))
436 ("single component aggregate in non-static context?",
438 Error_Msg_N
("\maybe subtype name was meant?", Indx
);
448 Rng
: constant Uint
:= Hiv
- Lov
+ 1;
451 -- Check if size is too large
453 if not UI_Is_In_Int_Range
(Rng
) then
457 Siz
:= Siz
* UI_To_Int
(Rng
);
461 or else Siz
> Max_Aggr_Size
466 -- Bounds must be in integer range, for later array construction
468 if not UI_Is_In_Int_Range
(Lov
)
470 not UI_Is_In_Int_Range
(Hiv
)
481 ---------------------------------
482 -- Backend_Processing_Possible --
483 ---------------------------------
485 -- Backend processing by Gigi/gcc is possible only if all the following
486 -- conditions are met:
488 -- 1. N is fully positional
490 -- 2. N is not a bit-packed array aggregate;
492 -- 3. The size of N's array type must be known at compile time. Note
493 -- that this implies that the component size is also known
495 -- 4. The array type of N does not follow the Fortran layout convention
496 -- or if it does it must be 1 dimensional.
498 -- 5. The array component type may not be tagged (which could necessitate
499 -- reassignment of proper tags).
501 -- 6. The array component type must not have unaligned bit components
503 -- 7. None of the components of the aggregate may be bit unaligned
506 -- 8. There cannot be delayed components, since we do not know enough
507 -- at this stage to know if back end processing is possible.
509 -- 9. There cannot be any discriminated record components, since the
510 -- back end cannot handle this complex case.
512 -- 10. No controlled actions need to be generated for components
514 -- 11. For a VM back end, the array should have no aliased components
516 function Backend_Processing_Possible
(N
: Node_Id
) return Boolean is
517 Typ
: constant Entity_Id
:= Etype
(N
);
518 -- Typ is the correct constrained array subtype of the aggregate
520 function Component_Check
(N
: Node_Id
; Index
: Node_Id
) return Boolean;
521 -- This routine checks components of aggregate N, enforcing checks
522 -- 1, 7, 8, and 9. In the multi-dimensional case, these checks are
523 -- performed on subaggregates. The Index value is the current index
524 -- being checked in the multi-dimensional case.
526 ---------------------
527 -- Component_Check --
528 ---------------------
530 function Component_Check
(N
: Node_Id
; Index
: Node_Id
) return Boolean is
534 -- Checks 1: (no component associations)
536 if Present
(Component_Associations
(N
)) then
540 -- Checks on components
542 -- Recurse to check subaggregates, which may appear in qualified
543 -- expressions. If delayed, the front-end will have to expand.
544 -- If the component is a discriminated record, treat as non-static,
545 -- as the back-end cannot handle this properly.
547 Expr
:= First
(Expressions
(N
));
548 while Present
(Expr
) loop
550 -- Checks 8: (no delayed components)
552 if Is_Delayed_Aggregate
(Expr
) then
556 -- Checks 9: (no discriminated records)
558 if Present
(Etype
(Expr
))
559 and then Is_Record_Type
(Etype
(Expr
))
560 and then Has_Discriminants
(Etype
(Expr
))
565 -- Checks 7. Component must not be bit aligned component
567 if Possible_Bit_Aligned_Component
(Expr
) then
571 -- Recursion to following indexes for multiple dimension case
573 if Present
(Next_Index
(Index
))
574 and then not Component_Check
(Expr
, Next_Index
(Index
))
579 -- All checks for that component finished, on to next
587 -- Start of processing for Backend_Processing_Possible
590 -- Checks 2 (array not bit packed) and 10 (no controlled actions)
592 if Is_Bit_Packed_Array
(Typ
) or else Needs_Finalization
(Typ
) then
596 -- If component is limited, aggregate must be expanded because each
597 -- component assignment must be built in place.
599 if Is_Immutably_Limited_Type
(Component_Type
(Typ
)) then
603 -- Checks 4 (array must not be multi-dimensional Fortran case)
605 if Convention
(Typ
) = Convention_Fortran
606 and then Number_Dimensions
(Typ
) > 1
611 -- Checks 3 (size of array must be known at compile time)
613 if not Size_Known_At_Compile_Time
(Typ
) then
617 -- Checks on components
619 if not Component_Check
(N
, First_Index
(Typ
)) then
623 -- Checks 5 (if the component type is tagged, then we may need to do
624 -- tag adjustments. Perhaps this should be refined to check for any
625 -- component associations that actually need tag adjustment, similar
626 -- to the test in Component_Not_OK_For_Backend for record aggregates
627 -- with tagged components, but not clear whether it's worthwhile ???;
628 -- in the case of the JVM, object tags are handled implicitly)
630 if Is_Tagged_Type
(Component_Type
(Typ
))
631 and then Tagged_Type_Expansion
636 -- Checks 6 (component type must not have bit aligned components)
638 if Type_May_Have_Bit_Aligned_Components
(Component_Type
(Typ
)) then
642 -- Checks 11: Array aggregates with aliased components are currently
643 -- not well supported by the VM backend; disable temporarily this
644 -- backend processing until it is definitely supported.
646 if VM_Target
/= No_VM
647 and then Has_Aliased_Components
(Base_Type
(Typ
))
652 -- Backend processing is possible
654 Set_Size_Known_At_Compile_Time
(Etype
(N
), True);
656 end Backend_Processing_Possible
;
658 ---------------------------
659 -- Build_Array_Aggr_Code --
660 ---------------------------
662 -- The code that we generate from a one dimensional aggregate is
664 -- 1. If the sub-aggregate contains discrete choices we
666 -- (a) Sort the discrete choices
668 -- (b) Otherwise for each discrete choice that specifies a range we
669 -- emit a loop. If a range specifies a maximum of three values, or
670 -- we are dealing with an expression we emit a sequence of
671 -- assignments instead of a loop.
673 -- (c) Generate the remaining loops to cover the others choice if any
675 -- 2. If the aggregate contains positional elements we
677 -- (a) translate the positional elements in a series of assignments
679 -- (b) Generate a final loop to cover the others choice if any.
680 -- Note that this final loop has to be a while loop since the case
682 -- L : Integer := Integer'Last;
683 -- H : Integer := Integer'Last;
684 -- A : array (L .. H) := (1, others =>0);
686 -- cannot be handled by a for loop. Thus for the following
688 -- array (L .. H) := (.. positional elements.., others =>E);
690 -- we always generate something like:
692 -- J : Index_Type := Index_Of_Last_Positional_Element;
694 -- J := Index_Base'Succ (J)
698 function Build_Array_Aggr_Code
703 Scalar_Comp
: Boolean;
704 Indexes
: List_Id
:= No_List
;
705 Flist
: Node_Id
:= Empty
) return List_Id
707 Loc
: constant Source_Ptr
:= Sloc
(N
);
708 Index_Base
: constant Entity_Id
:= Base_Type
(Etype
(Index
));
709 Index_Base_L
: constant Node_Id
:= Type_Low_Bound
(Index_Base
);
710 Index_Base_H
: constant Node_Id
:= Type_High_Bound
(Index_Base
);
712 function Add
(Val
: Int
; To
: Node_Id
) return Node_Id
;
713 -- Returns an expression where Val is added to expression To, unless
714 -- To+Val is provably out of To's base type range. To must be an
715 -- already analyzed expression.
717 function Empty_Range
(L
, H
: Node_Id
) return Boolean;
718 -- Returns True if the range defined by L .. H is certainly empty
720 function Equal
(L
, H
: Node_Id
) return Boolean;
721 -- Returns True if L = H for sure
723 function Index_Base_Name
return Node_Id
;
724 -- Returns a new reference to the index type name
726 function Gen_Assign
(Ind
: Node_Id
; Expr
: Node_Id
) return List_Id
;
727 -- Ind must be a side-effect free expression. If the input aggregate
728 -- N to Build_Loop contains no sub-aggregates, then this function
729 -- returns the assignment statement:
731 -- Into (Indexes, Ind) := Expr;
733 -- Otherwise we call Build_Code recursively
735 -- Ada 2005 (AI-287): In case of default initialized component, Expr
736 -- is empty and we generate a call to the corresponding IP subprogram.
738 function Gen_Loop
(L
, H
: Node_Id
; Expr
: Node_Id
) return List_Id
;
739 -- Nodes L and H must be side-effect free expressions.
740 -- If the input aggregate N to Build_Loop contains no sub-aggregates,
741 -- This routine returns the for loop statement
743 -- for J in Index_Base'(L) .. Index_Base'(H) loop
744 -- Into (Indexes, J) := Expr;
747 -- Otherwise we call Build_Code recursively.
748 -- As an optimization if the loop covers 3 or less scalar elements we
749 -- generate a sequence of assignments.
751 function Gen_While
(L
, H
: Node_Id
; Expr
: Node_Id
) return List_Id
;
752 -- Nodes L and H must be side-effect free expressions.
753 -- If the input aggregate N to Build_Loop contains no sub-aggregates,
754 -- This routine returns the while loop statement
756 -- J : Index_Base := L;
758 -- J := Index_Base'Succ (J);
759 -- Into (Indexes, J) := Expr;
762 -- Otherwise we call Build_Code recursively
764 function Local_Compile_Time_Known_Value
(E
: Node_Id
) return Boolean;
765 function Local_Expr_Value
(E
: Node_Id
) return Uint
;
766 -- These two Local routines are used to replace the corresponding ones
767 -- in sem_eval because while processing the bounds of an aggregate with
768 -- discrete choices whose index type is an enumeration, we build static
769 -- expressions not recognized by Compile_Time_Known_Value as such since
770 -- they have not yet been analyzed and resolved. All the expressions in
771 -- question are things like Index_Base_Name'Val (Const) which we can
772 -- easily recognize as being constant.
778 function Add
(Val
: Int
; To
: Node_Id
) return Node_Id
is
783 U_Val
: constant Uint
:= UI_From_Int
(Val
);
786 -- Note: do not try to optimize the case of Val = 0, because
787 -- we need to build a new node with the proper Sloc value anyway.
789 -- First test if we can do constant folding
791 if Local_Compile_Time_Known_Value
(To
) then
792 U_To
:= Local_Expr_Value
(To
) + Val
;
794 -- Determine if our constant is outside the range of the index.
795 -- If so return an Empty node. This empty node will be caught
796 -- by Empty_Range below.
798 if Compile_Time_Known_Value
(Index_Base_L
)
799 and then U_To
< Expr_Value
(Index_Base_L
)
803 elsif Compile_Time_Known_Value
(Index_Base_H
)
804 and then U_To
> Expr_Value
(Index_Base_H
)
809 Expr_Pos
:= Make_Integer_Literal
(Loc
, U_To
);
810 Set_Is_Static_Expression
(Expr_Pos
);
812 if not Is_Enumeration_Type
(Index_Base
) then
815 -- If we are dealing with enumeration return
816 -- Index_Base'Val (Expr_Pos)
820 Make_Attribute_Reference
822 Prefix
=> Index_Base_Name
,
823 Attribute_Name
=> Name_Val
,
824 Expressions
=> New_List
(Expr_Pos
));
830 -- If we are here no constant folding possible
832 if not Is_Enumeration_Type
(Index_Base
) then
835 Left_Opnd
=> Duplicate_Subexpr
(To
),
836 Right_Opnd
=> Make_Integer_Literal
(Loc
, U_Val
));
838 -- If we are dealing with enumeration return
839 -- Index_Base'Val (Index_Base'Pos (To) + Val)
843 Make_Attribute_Reference
845 Prefix
=> Index_Base_Name
,
846 Attribute_Name
=> Name_Pos
,
847 Expressions
=> New_List
(Duplicate_Subexpr
(To
)));
852 Right_Opnd
=> Make_Integer_Literal
(Loc
, U_Val
));
855 Make_Attribute_Reference
857 Prefix
=> Index_Base_Name
,
858 Attribute_Name
=> Name_Val
,
859 Expressions
=> New_List
(Expr_Pos
));
869 function Empty_Range
(L
, H
: Node_Id
) return Boolean is
870 Is_Empty
: Boolean := False;
875 -- First check if L or H were already detected as overflowing the
876 -- index base range type by function Add above. If this is so Add
877 -- returns the empty node.
879 if No
(L
) or else No
(H
) then
886 -- L > H range is empty
892 -- B_L > H range must be empty
898 -- L > B_H range must be empty
902 High
:= Index_Base_H
;
905 if Local_Compile_Time_Known_Value
(Low
)
906 and then Local_Compile_Time_Known_Value
(High
)
909 UI_Gt
(Local_Expr_Value
(Low
), Local_Expr_Value
(High
));
922 function Equal
(L
, H
: Node_Id
) return Boolean is
927 elsif Local_Compile_Time_Known_Value
(L
)
928 and then Local_Compile_Time_Known_Value
(H
)
930 return UI_Eq
(Local_Expr_Value
(L
), Local_Expr_Value
(H
));
940 function Gen_Assign
(Ind
: Node_Id
; Expr
: Node_Id
) return List_Id
is
941 L
: constant List_Id
:= New_List
;
945 New_Indexes
: List_Id
;
946 Indexed_Comp
: Node_Id
;
948 Comp_Type
: Entity_Id
:= Empty
;
950 function Add_Loop_Actions
(Lis
: List_Id
) return List_Id
;
951 -- Collect insert_actions generated in the construction of a
952 -- loop, and prepend them to the sequence of assignments to
953 -- complete the eventual body of the loop.
955 ----------------------
956 -- Add_Loop_Actions --
957 ----------------------
959 function Add_Loop_Actions
(Lis
: List_Id
) return List_Id
is
963 -- Ada 2005 (AI-287): Do nothing else in case of default
964 -- initialized component.
969 elsif Nkind
(Parent
(Expr
)) = N_Component_Association
970 and then Present
(Loop_Actions
(Parent
(Expr
)))
972 Append_List
(Lis
, Loop_Actions
(Parent
(Expr
)));
973 Res
:= Loop_Actions
(Parent
(Expr
));
974 Set_Loop_Actions
(Parent
(Expr
), No_List
);
980 end Add_Loop_Actions
;
982 -- Start of processing for Gen_Assign
986 New_Indexes
:= New_List
;
988 New_Indexes
:= New_Copy_List_Tree
(Indexes
);
991 Append_To
(New_Indexes
, Ind
);
993 if Present
(Flist
) then
994 F
:= New_Copy_Tree
(Flist
);
996 elsif Present
(Etype
(N
)) and then Needs_Finalization
(Etype
(N
)) then
997 if Is_Entity_Name
(Into
)
998 and then Present
(Scope
(Entity
(Into
)))
1000 F
:= Find_Final_List
(Scope
(Entity
(Into
)));
1002 F
:= Find_Final_List
(Current_Scope
);
1008 if Present
(Next_Index
(Index
)) then
1011 Build_Array_Aggr_Code
1014 Index
=> Next_Index
(Index
),
1016 Scalar_Comp
=> Scalar_Comp
,
1017 Indexes
=> New_Indexes
,
1021 -- If we get here then we are at a bottom-level (sub-)aggregate
1025 (Make_Indexed_Component
(Loc
,
1026 Prefix
=> New_Copy_Tree
(Into
),
1027 Expressions
=> New_Indexes
));
1029 Set_Assignment_OK
(Indexed_Comp
);
1031 -- Ada 2005 (AI-287): In case of default initialized component, Expr
1032 -- is not present (and therefore we also initialize Expr_Q to empty).
1036 elsif Nkind
(Expr
) = N_Qualified_Expression
then
1037 Expr_Q
:= Expression
(Expr
);
1042 if Present
(Etype
(N
))
1043 and then Etype
(N
) /= Any_Composite
1045 Comp_Type
:= Component_Type
(Etype
(N
));
1046 pragma Assert
(Comp_Type
= Ctype
); -- AI-287
1048 elsif Present
(Next
(First
(New_Indexes
))) then
1050 -- Ada 2005 (AI-287): Do nothing in case of default initialized
1051 -- component because we have received the component type in
1052 -- the formal parameter Ctype.
1054 -- ??? Some assert pragmas have been added to check if this new
1055 -- formal can be used to replace this code in all cases.
1057 if Present
(Expr
) then
1059 -- This is a multidimensional array. Recover the component
1060 -- type from the outermost aggregate, because subaggregates
1061 -- do not have an assigned type.
1068 while Present
(P
) loop
1069 if Nkind
(P
) = N_Aggregate
1070 and then Present
(Etype
(P
))
1072 Comp_Type
:= Component_Type
(Etype
(P
));
1080 pragma Assert
(Comp_Type
= Ctype
); -- AI-287
1085 -- Ada 2005 (AI-287): We only analyze the expression in case of non-
1086 -- default initialized components (otherwise Expr_Q is not present).
1089 and then Nkind_In
(Expr_Q
, N_Aggregate
, N_Extension_Aggregate
)
1091 -- At this stage the Expression may not have been analyzed yet
1092 -- because the array aggregate code has not been updated to use
1093 -- the Expansion_Delayed flag and avoid analysis altogether to
1094 -- solve the same problem (see Resolve_Aggr_Expr). So let us do
1095 -- the analysis of non-array aggregates now in order to get the
1096 -- value of Expansion_Delayed flag for the inner aggregate ???
1098 if Present
(Comp_Type
) and then not Is_Array_Type
(Comp_Type
) then
1099 Analyze_And_Resolve
(Expr_Q
, Comp_Type
);
1102 if Is_Delayed_Aggregate
(Expr_Q
) then
1104 -- This is either a subaggregate of a multidimensional array,
1105 -- or a component of an array type whose component type is
1106 -- also an array. In the latter case, the expression may have
1107 -- component associations that provide different bounds from
1108 -- those of the component type, and sliding must occur. Instead
1109 -- of decomposing the current aggregate assignment, force the
1110 -- re-analysis of the assignment, so that a temporary will be
1111 -- generated in the usual fashion, and sliding will take place.
1113 if Nkind
(Parent
(N
)) = N_Assignment_Statement
1114 and then Is_Array_Type
(Comp_Type
)
1115 and then Present
(Component_Associations
(Expr_Q
))
1116 and then Must_Slide
(Comp_Type
, Etype
(Expr_Q
))
1118 Set_Expansion_Delayed
(Expr_Q
, False);
1119 Set_Analyzed
(Expr_Q
, False);
1125 Expr_Q
, Etype
(Expr_Q
), Indexed_Comp
, F
));
1130 -- Ada 2005 (AI-287): In case of default initialized component, call
1131 -- the initialization subprogram associated with the component type.
1132 -- If the component type is an access type, add an explicit null
1133 -- assignment, because for the back-end there is an initialization
1134 -- present for the whole aggregate, and no default initialization
1137 -- In addition, if the component type is controlled, we must call
1138 -- its Initialize procedure explicitly, because there is no explicit
1139 -- object creation that will invoke it otherwise.
1142 if Present
(Base_Init_Proc
(Base_Type
(Ctype
)))
1143 or else Has_Task
(Base_Type
(Ctype
))
1146 Build_Initialization_Call
(Loc
,
1147 Id_Ref
=> Indexed_Comp
,
1149 With_Default_Init
=> True));
1151 elsif Is_Access_Type
(Ctype
) then
1153 Make_Assignment_Statement
(Loc
,
1154 Name
=> Indexed_Comp
,
1155 Expression
=> Make_Null
(Loc
)));
1158 if Needs_Finalization
(Ctype
) then
1161 Ref
=> New_Copy_Tree
(Indexed_Comp
),
1163 Flist_Ref
=> Find_Final_List
(Current_Scope
),
1164 With_Attach
=> Make_Integer_Literal
(Loc
, 1)));
1168 -- Now generate the assignment with no associated controlled
1169 -- actions since the target of the assignment may not have been
1170 -- initialized, it is not possible to Finalize it as expected by
1171 -- normal controlled assignment. The rest of the controlled
1172 -- actions are done manually with the proper finalization list
1173 -- coming from the context.
1176 Make_OK_Assignment_Statement
(Loc
,
1177 Name
=> Indexed_Comp
,
1178 Expression
=> New_Copy_Tree
(Expr
));
1180 if Present
(Comp_Type
) and then Needs_Finalization
(Comp_Type
) then
1181 Set_No_Ctrl_Actions
(A
);
1183 -- If this is an aggregate for an array of arrays, each
1184 -- sub-aggregate will be expanded as well, and even with
1185 -- No_Ctrl_Actions the assignments of inner components will
1186 -- require attachment in their assignments to temporaries.
1187 -- These temporaries must be finalized for each subaggregate,
1188 -- to prevent multiple attachments of the same temporary
1189 -- location to same finalization chain (and consequently
1190 -- circular lists). To ensure that finalization takes place
1191 -- for each subaggregate we wrap the assignment in a block.
1193 if Is_Array_Type
(Comp_Type
)
1194 and then Nkind
(Expr
) = N_Aggregate
1197 Make_Block_Statement
(Loc
,
1198 Handled_Statement_Sequence
=>
1199 Make_Handled_Sequence_Of_Statements
(Loc
,
1200 Statements
=> New_List
(A
)));
1206 -- Adjust the tag if tagged (because of possible view
1207 -- conversions), unless compiling for a VM where
1208 -- tags are implicit.
1210 if Present
(Comp_Type
)
1211 and then Is_Tagged_Type
(Comp_Type
)
1212 and then Tagged_Type_Expansion
1215 Make_OK_Assignment_Statement
(Loc
,
1217 Make_Selected_Component
(Loc
,
1218 Prefix
=> New_Copy_Tree
(Indexed_Comp
),
1221 (First_Tag_Component
(Comp_Type
), Loc
)),
1224 Unchecked_Convert_To
(RTE
(RE_Tag
),
1226 (Node
(First_Elmt
(Access_Disp_Table
(Comp_Type
))),
1232 -- Adjust and attach the component to the proper final list, which
1233 -- can be the controller of the outer record object or the final
1234 -- list associated with the scope.
1236 -- If the component is itself an array of controlled types, whose
1237 -- value is given by a sub-aggregate, then the attach calls have
1238 -- been generated when individual subcomponent are assigned, and
1239 -- must not be done again to prevent malformed finalization chains
1240 -- (see comments above, concerning the creation of a block to hold
1241 -- inner finalization actions).
1243 if Present
(Comp_Type
)
1244 and then Needs_Finalization
(Comp_Type
)
1245 and then not Is_Limited_Type
(Comp_Type
)
1247 (Is_Array_Type
(Comp_Type
)
1248 and then Is_Controlled
(Component_Type
(Comp_Type
))
1249 and then Nkind
(Expr
) = N_Aggregate
)
1253 Ref
=> New_Copy_Tree
(Indexed_Comp
),
1256 With_Attach
=> Make_Integer_Literal
(Loc
, 1)));
1260 return Add_Loop_Actions
(L
);
1267 function Gen_Loop
(L
, H
: Node_Id
; Expr
: Node_Id
) return List_Id
is
1277 -- Index_Base'(L) .. Index_Base'(H)
1279 L_Iteration_Scheme
: Node_Id
;
1280 -- L_J in Index_Base'(L) .. Index_Base'(H)
1283 -- The statements to execute in the loop
1285 S
: constant List_Id
:= New_List
;
1286 -- List of statements
1289 -- Copy of expression tree, used for checking purposes
1292 -- If loop bounds define an empty range return the null statement
1294 if Empty_Range
(L
, H
) then
1295 Append_To
(S
, Make_Null_Statement
(Loc
));
1297 -- Ada 2005 (AI-287): Nothing else need to be done in case of
1298 -- default initialized component.
1304 -- The expression must be type-checked even though no component
1305 -- of the aggregate will have this value. This is done only for
1306 -- actual components of the array, not for subaggregates. Do
1307 -- the check on a copy, because the expression may be shared
1308 -- among several choices, some of which might be non-null.
1310 if Present
(Etype
(N
))
1311 and then Is_Array_Type
(Etype
(N
))
1312 and then No
(Next_Index
(Index
))
1314 Expander_Mode_Save_And_Set
(False);
1315 Tcopy
:= New_Copy_Tree
(Expr
);
1316 Set_Parent
(Tcopy
, N
);
1317 Analyze_And_Resolve
(Tcopy
, Component_Type
(Etype
(N
)));
1318 Expander_Mode_Restore
;
1324 -- If loop bounds are the same then generate an assignment
1326 elsif Equal
(L
, H
) then
1327 return Gen_Assign
(New_Copy_Tree
(L
), Expr
);
1329 -- If H - L <= 2 then generate a sequence of assignments when we are
1330 -- processing the bottom most aggregate and it contains scalar
1333 elsif No
(Next_Index
(Index
))
1334 and then Scalar_Comp
1335 and then Local_Compile_Time_Known_Value
(L
)
1336 and then Local_Compile_Time_Known_Value
(H
)
1337 and then Local_Expr_Value
(H
) - Local_Expr_Value
(L
) <= 2
1340 Append_List_To
(S
, Gen_Assign
(New_Copy_Tree
(L
), Expr
));
1341 Append_List_To
(S
, Gen_Assign
(Add
(1, To
=> L
), Expr
));
1343 if Local_Expr_Value
(H
) - Local_Expr_Value
(L
) = 2 then
1344 Append_List_To
(S
, Gen_Assign
(Add
(2, To
=> L
), Expr
));
1350 -- Otherwise construct the loop, starting with the loop index L_J
1352 L_J
:= Make_Temporary
(Loc
, 'J', L
);
1354 -- Construct "L .. H" in Index_Base. We use a qualified expression
1355 -- for the bound to convert to the index base, but we don't need
1356 -- to do that if we already have the base type at hand.
1358 if Etype
(L
) = Index_Base
then
1362 Make_Qualified_Expression
(Loc
,
1363 Subtype_Mark
=> Index_Base_Name
,
1367 if Etype
(H
) = Index_Base
then
1371 Make_Qualified_Expression
(Loc
,
1372 Subtype_Mark
=> Index_Base_Name
,
1381 -- Construct "for L_J in Index_Base range L .. H"
1383 L_Iteration_Scheme
:=
1384 Make_Iteration_Scheme
1386 Loop_Parameter_Specification
=>
1387 Make_Loop_Parameter_Specification
1389 Defining_Identifier
=> L_J
,
1390 Discrete_Subtype_Definition
=> L_Range
));
1392 -- Construct the statements to execute in the loop body
1394 L_Body
:= Gen_Assign
(New_Reference_To
(L_J
, Loc
), Expr
);
1396 -- Construct the final loop
1398 Append_To
(S
, Make_Implicit_Loop_Statement
1400 Identifier
=> Empty
,
1401 Iteration_Scheme
=> L_Iteration_Scheme
,
1402 Statements
=> L_Body
));
1404 -- A small optimization: if the aggregate is initialized with a box
1405 -- and the component type has no initialization procedure, remove the
1406 -- useless empty loop.
1408 if Nkind
(First
(S
)) = N_Loop_Statement
1409 and then Is_Empty_List
(Statements
(First
(S
)))
1411 return New_List
(Make_Null_Statement
(Loc
));
1421 -- The code built is
1423 -- W_J : Index_Base := L;
1424 -- while W_J < H loop
1425 -- W_J := Index_Base'Succ (W);
1429 function Gen_While
(L
, H
: Node_Id
; Expr
: Node_Id
) return List_Id
is
1433 -- W_J : Base_Type := L;
1435 W_Iteration_Scheme
: Node_Id
;
1438 W_Index_Succ
: Node_Id
;
1439 -- Index_Base'Succ (J)
1441 W_Increment
: Node_Id
;
1442 -- W_J := Index_Base'Succ (W)
1444 W_Body
: constant List_Id
:= New_List
;
1445 -- The statements to execute in the loop
1447 S
: constant List_Id
:= New_List
;
1448 -- list of statement
1451 -- If loop bounds define an empty range or are equal return null
1453 if Empty_Range
(L
, H
) or else Equal
(L
, H
) then
1454 Append_To
(S
, Make_Null_Statement
(Loc
));
1458 -- Build the decl of W_J
1460 W_J
:= Make_Temporary
(Loc
, 'J', L
);
1462 Make_Object_Declaration
1464 Defining_Identifier
=> W_J
,
1465 Object_Definition
=> Index_Base_Name
,
1468 -- Theoretically we should do a New_Copy_Tree (L) here, but we know
1469 -- that in this particular case L is a fresh Expr generated by
1470 -- Add which we are the only ones to use.
1472 Append_To
(S
, W_Decl
);
1474 -- Construct " while W_J < H"
1476 W_Iteration_Scheme
:=
1477 Make_Iteration_Scheme
1479 Condition
=> Make_Op_Lt
1481 Left_Opnd
=> New_Reference_To
(W_J
, Loc
),
1482 Right_Opnd
=> New_Copy_Tree
(H
)));
1484 -- Construct the statements to execute in the loop body
1487 Make_Attribute_Reference
1489 Prefix
=> Index_Base_Name
,
1490 Attribute_Name
=> Name_Succ
,
1491 Expressions
=> New_List
(New_Reference_To
(W_J
, Loc
)));
1494 Make_OK_Assignment_Statement
1496 Name
=> New_Reference_To
(W_J
, Loc
),
1497 Expression
=> W_Index_Succ
);
1499 Append_To
(W_Body
, W_Increment
);
1500 Append_List_To
(W_Body
,
1501 Gen_Assign
(New_Reference_To
(W_J
, Loc
), Expr
));
1503 -- Construct the final loop
1505 Append_To
(S
, Make_Implicit_Loop_Statement
1507 Identifier
=> Empty
,
1508 Iteration_Scheme
=> W_Iteration_Scheme
,
1509 Statements
=> W_Body
));
1514 ---------------------
1515 -- Index_Base_Name --
1516 ---------------------
1518 function Index_Base_Name
return Node_Id
is
1520 return New_Reference_To
(Index_Base
, Sloc
(N
));
1521 end Index_Base_Name
;
1523 ------------------------------------
1524 -- Local_Compile_Time_Known_Value --
1525 ------------------------------------
1527 function Local_Compile_Time_Known_Value
(E
: Node_Id
) return Boolean is
1529 return Compile_Time_Known_Value
(E
)
1531 (Nkind
(E
) = N_Attribute_Reference
1532 and then Attribute_Name
(E
) = Name_Val
1533 and then Compile_Time_Known_Value
(First
(Expressions
(E
))));
1534 end Local_Compile_Time_Known_Value
;
1536 ----------------------
1537 -- Local_Expr_Value --
1538 ----------------------
1540 function Local_Expr_Value
(E
: Node_Id
) return Uint
is
1542 if Compile_Time_Known_Value
(E
) then
1543 return Expr_Value
(E
);
1545 return Expr_Value
(First
(Expressions
(E
)));
1547 end Local_Expr_Value
;
1549 -- Build_Array_Aggr_Code Variables
1556 Others_Expr
: Node_Id
:= Empty
;
1557 Others_Box_Present
: Boolean := False;
1559 Aggr_L
: constant Node_Id
:= Low_Bound
(Aggregate_Bounds
(N
));
1560 Aggr_H
: constant Node_Id
:= High_Bound
(Aggregate_Bounds
(N
));
1561 -- The aggregate bounds of this specific sub-aggregate. Note that if
1562 -- the code generated by Build_Array_Aggr_Code is executed then these
1563 -- bounds are OK. Otherwise a Constraint_Error would have been raised.
1565 Aggr_Low
: constant Node_Id
:= Duplicate_Subexpr_No_Checks
(Aggr_L
);
1566 Aggr_High
: constant Node_Id
:= Duplicate_Subexpr_No_Checks
(Aggr_H
);
1567 -- After Duplicate_Subexpr these are side-effect free
1572 Nb_Choices
: Nat
:= 0;
1573 Table
: Case_Table_Type
(1 .. Number_Of_Choices
(N
));
1574 -- Used to sort all the different choice values
1577 -- Number of elements in the positional aggregate
1579 New_Code
: constant List_Id
:= New_List
;
1581 -- Start of processing for Build_Array_Aggr_Code
1584 -- First before we start, a special case. if we have a bit packed
1585 -- array represented as a modular type, then clear the value to
1586 -- zero first, to ensure that unused bits are properly cleared.
1591 and then Is_Bit_Packed_Array
(Typ
)
1592 and then Is_Modular_Integer_Type
(Packed_Array_Type
(Typ
))
1594 Append_To
(New_Code
,
1595 Make_Assignment_Statement
(Loc
,
1596 Name
=> New_Copy_Tree
(Into
),
1598 Unchecked_Convert_To
(Typ
,
1599 Make_Integer_Literal
(Loc
, Uint_0
))));
1602 -- If the component type contains tasks, we need to build a Master
1603 -- entity in the current scope, because it will be needed if build-
1604 -- in-place functions are called in the expanded code.
1606 if Nkind
(Parent
(N
)) = N_Object_Declaration
1607 and then Has_Task
(Typ
)
1609 Build_Master_Entity
(Defining_Identifier
(Parent
(N
)));
1612 -- STEP 1: Process component associations
1614 -- For those associations that may generate a loop, initialize
1615 -- Loop_Actions to collect inserted actions that may be crated.
1617 -- Skip this if no component associations
1619 if No
(Expressions
(N
)) then
1621 -- STEP 1 (a): Sort the discrete choices
1623 Assoc
:= First
(Component_Associations
(N
));
1624 while Present
(Assoc
) loop
1625 Choice
:= First
(Choices
(Assoc
));
1626 while Present
(Choice
) loop
1627 if Nkind
(Choice
) = N_Others_Choice
then
1628 Set_Loop_Actions
(Assoc
, New_List
);
1630 if Box_Present
(Assoc
) then
1631 Others_Box_Present
:= True;
1633 Others_Expr
:= Expression
(Assoc
);
1638 Get_Index_Bounds
(Choice
, Low
, High
);
1641 Set_Loop_Actions
(Assoc
, New_List
);
1644 Nb_Choices
:= Nb_Choices
+ 1;
1645 if Box_Present
(Assoc
) then
1646 Table
(Nb_Choices
) := (Choice_Lo
=> Low
,
1648 Choice_Node
=> Empty
);
1650 Table
(Nb_Choices
) := (Choice_Lo
=> Low
,
1652 Choice_Node
=> Expression
(Assoc
));
1660 -- If there is more than one set of choices these must be static
1661 -- and we can therefore sort them. Remember that Nb_Choices does not
1662 -- account for an others choice.
1664 if Nb_Choices
> 1 then
1665 Sort_Case_Table
(Table
);
1668 -- STEP 1 (b): take care of the whole set of discrete choices
1670 for J
in 1 .. Nb_Choices
loop
1671 Low
:= Table
(J
).Choice_Lo
;
1672 High
:= Table
(J
).Choice_Hi
;
1673 Expr
:= Table
(J
).Choice_Node
;
1674 Append_List
(Gen_Loop
(Low
, High
, Expr
), To
=> New_Code
);
1677 -- STEP 1 (c): generate the remaining loops to cover others choice
1678 -- We don't need to generate loops over empty gaps, but if there is
1679 -- a single empty range we must analyze the expression for semantics
1681 if Present
(Others_Expr
) or else Others_Box_Present
then
1683 First
: Boolean := True;
1686 for J
in 0 .. Nb_Choices
loop
1690 Low
:= Add
(1, To
=> Table
(J
).Choice_Hi
);
1693 if J
= Nb_Choices
then
1696 High
:= Add
(-1, To
=> Table
(J
+ 1).Choice_Lo
);
1699 -- If this is an expansion within an init proc, make
1700 -- sure that discriminant references are replaced by
1701 -- the corresponding discriminal.
1703 if Inside_Init_Proc
then
1704 if Is_Entity_Name
(Low
)
1705 and then Ekind
(Entity
(Low
)) = E_Discriminant
1707 Set_Entity
(Low
, Discriminal
(Entity
(Low
)));
1710 if Is_Entity_Name
(High
)
1711 and then Ekind
(Entity
(High
)) = E_Discriminant
1713 Set_Entity
(High
, Discriminal
(Entity
(High
)));
1718 or else not Empty_Range
(Low
, High
)
1722 (Gen_Loop
(Low
, High
, Others_Expr
), To
=> New_Code
);
1728 -- STEP 2: Process positional components
1731 -- STEP 2 (a): Generate the assignments for each positional element
1732 -- Note that here we have to use Aggr_L rather than Aggr_Low because
1733 -- Aggr_L is analyzed and Add wants an analyzed expression.
1735 Expr
:= First
(Expressions
(N
));
1737 while Present
(Expr
) loop
1738 Nb_Elements
:= Nb_Elements
+ 1;
1739 Append_List
(Gen_Assign
(Add
(Nb_Elements
, To
=> Aggr_L
), Expr
),
1744 -- STEP 2 (b): Generate final loop if an others choice is present
1745 -- Here Nb_Elements gives the offset of the last positional element.
1747 if Present
(Component_Associations
(N
)) then
1748 Assoc
:= Last
(Component_Associations
(N
));
1750 -- Ada 2005 (AI-287)
1752 if Box_Present
(Assoc
) then
1753 Append_List
(Gen_While
(Add
(Nb_Elements
, To
=> Aggr_L
),
1758 Expr
:= Expression
(Assoc
);
1760 Append_List
(Gen_While
(Add
(Nb_Elements
, To
=> Aggr_L
),
1769 end Build_Array_Aggr_Code
;
1771 ----------------------------
1772 -- Build_Record_Aggr_Code --
1773 ----------------------------
1775 function Build_Record_Aggr_Code
1779 Flist
: Node_Id
:= Empty
;
1780 Obj
: Entity_Id
:= Empty
;
1781 Is_Limited_Ancestor_Expansion
: Boolean := False) return List_Id
1783 Loc
: constant Source_Ptr
:= Sloc
(N
);
1784 L
: constant List_Id
:= New_List
;
1785 N_Typ
: constant Entity_Id
:= Etype
(N
);
1792 Comp_Type
: Entity_Id
;
1793 Selector
: Entity_Id
;
1794 Comp_Expr
: Node_Id
;
1797 Internal_Final_List
: Node_Id
:= Empty
;
1799 -- If this is an internal aggregate, the External_Final_List is an
1800 -- expression for the controller record of the enclosing type.
1802 -- If the current aggregate has several controlled components, this
1803 -- expression will appear in several calls to attach to the finali-
1804 -- zation list, and it must not be shared.
1806 External_Final_List
: Node_Id
;
1807 Ancestor_Is_Expression
: Boolean := False;
1808 Ancestor_Is_Subtype_Mark
: Boolean := False;
1810 Init_Typ
: Entity_Id
:= Empty
;
1813 Ctrl_Stuff_Done
: Boolean := False;
1814 -- True if Gen_Ctrl_Actions_For_Aggr has already been called; calls
1815 -- after the first do nothing.
1817 function Ancestor_Discriminant_Value
(Disc
: Entity_Id
) return Node_Id
;
1818 -- Returns the value that the given discriminant of an ancestor type
1819 -- should receive (in the absence of a conflict with the value provided
1820 -- by an ancestor part of an extension aggregate).
1822 procedure Check_Ancestor_Discriminants
(Anc_Typ
: Entity_Id
);
1823 -- Check that each of the discriminant values defined by the ancestor
1824 -- part of an extension aggregate match the corresponding values
1825 -- provided by either an association of the aggregate or by the
1826 -- constraint imposed by a parent type (RM95-4.3.2(8)).
1828 function Compatible_Int_Bounds
1829 (Agg_Bounds
: Node_Id
;
1830 Typ_Bounds
: Node_Id
) return Boolean;
1831 -- Return true if Agg_Bounds are equal or within Typ_Bounds. It is
1832 -- assumed that both bounds are integer ranges.
1834 procedure Gen_Ctrl_Actions_For_Aggr
;
1835 -- Deal with the various controlled type data structure initializations
1836 -- (but only if it hasn't been done already).
1838 function Get_Constraint_Association
(T
: Entity_Id
) return Node_Id
;
1839 -- Returns the first discriminant association in the constraint
1840 -- associated with T, if any, otherwise returns Empty.
1842 function Init_Controller
1847 Init_Pr
: Boolean) return List_Id
;
1848 -- Returns the list of statements necessary to initialize the internal
1849 -- controller of the (possible) ancestor typ into target and attach it
1850 -- to finalization list F. Init_Pr conditions the call to the init proc
1851 -- since it may already be done due to ancestor initialization.
1853 function Is_Int_Range_Bounds
(Bounds
: Node_Id
) return Boolean;
1854 -- Check whether Bounds is a range node and its lower and higher bounds
1855 -- are integers literals.
1857 ---------------------------------
1858 -- Ancestor_Discriminant_Value --
1859 ---------------------------------
1861 function Ancestor_Discriminant_Value
(Disc
: Entity_Id
) return Node_Id
is
1863 Assoc_Elmt
: Elmt_Id
;
1864 Aggr_Comp
: Entity_Id
;
1865 Corresp_Disc
: Entity_Id
;
1866 Current_Typ
: Entity_Id
:= Base_Type
(Typ
);
1867 Parent_Typ
: Entity_Id
;
1868 Parent_Disc
: Entity_Id
;
1869 Save_Assoc
: Node_Id
:= Empty
;
1872 -- First check any discriminant associations to see if any of them
1873 -- provide a value for the discriminant.
1875 if Present
(Discriminant_Specifications
(Parent
(Current_Typ
))) then
1876 Assoc
:= First
(Component_Associations
(N
));
1877 while Present
(Assoc
) loop
1878 Aggr_Comp
:= Entity
(First
(Choices
(Assoc
)));
1880 if Ekind
(Aggr_Comp
) = E_Discriminant
then
1881 Save_Assoc
:= Expression
(Assoc
);
1883 Corresp_Disc
:= Corresponding_Discriminant
(Aggr_Comp
);
1884 while Present
(Corresp_Disc
) loop
1886 -- If found a corresponding discriminant then return the
1887 -- value given in the aggregate. (Note: this is not
1888 -- correct in the presence of side effects. ???)
1890 if Disc
= Corresp_Disc
then
1891 return Duplicate_Subexpr
(Expression
(Assoc
));
1895 Corresponding_Discriminant
(Corresp_Disc
);
1903 -- No match found in aggregate, so chain up parent types to find
1904 -- a constraint that defines the value of the discriminant.
1906 Parent_Typ
:= Etype
(Current_Typ
);
1907 while Current_Typ
/= Parent_Typ
loop
1908 if Has_Discriminants
(Parent_Typ
)
1909 and then not Has_Unknown_Discriminants
(Parent_Typ
)
1911 Parent_Disc
:= First_Discriminant
(Parent_Typ
);
1913 -- We either get the association from the subtype indication
1914 -- of the type definition itself, or from the discriminant
1915 -- constraint associated with the type entity (which is
1916 -- preferable, but it's not always present ???)
1918 if Is_Empty_Elmt_List
(
1919 Discriminant_Constraint
(Current_Typ
))
1921 Assoc
:= Get_Constraint_Association
(Current_Typ
);
1922 Assoc_Elmt
:= No_Elmt
;
1925 First_Elmt
(Discriminant_Constraint
(Current_Typ
));
1926 Assoc
:= Node
(Assoc_Elmt
);
1929 -- Traverse the discriminants of the parent type looking
1930 -- for one that corresponds.
1932 while Present
(Parent_Disc
) and then Present
(Assoc
) loop
1933 Corresp_Disc
:= Parent_Disc
;
1934 while Present
(Corresp_Disc
)
1935 and then Disc
/= Corresp_Disc
1938 Corresponding_Discriminant
(Corresp_Disc
);
1941 if Disc
= Corresp_Disc
then
1942 if Nkind
(Assoc
) = N_Discriminant_Association
then
1943 Assoc
:= Expression
(Assoc
);
1946 -- If the located association directly denotes a
1947 -- discriminant, then use the value of a saved
1948 -- association of the aggregate. This is a kludge to
1949 -- handle certain cases involving multiple discriminants
1950 -- mapped to a single discriminant of a descendant. It's
1951 -- not clear how to locate the appropriate discriminant
1952 -- value for such cases. ???
1954 if Is_Entity_Name
(Assoc
)
1955 and then Ekind
(Entity
(Assoc
)) = E_Discriminant
1957 Assoc
:= Save_Assoc
;
1960 return Duplicate_Subexpr
(Assoc
);
1963 Next_Discriminant
(Parent_Disc
);
1965 if No
(Assoc_Elmt
) then
1968 Next_Elmt
(Assoc_Elmt
);
1969 if Present
(Assoc_Elmt
) then
1970 Assoc
:= Node
(Assoc_Elmt
);
1978 Current_Typ
:= Parent_Typ
;
1979 Parent_Typ
:= Etype
(Current_Typ
);
1982 -- In some cases there's no ancestor value to locate (such as
1983 -- when an ancestor part given by an expression defines the
1984 -- discriminant value).
1987 end Ancestor_Discriminant_Value
;
1989 ----------------------------------
1990 -- Check_Ancestor_Discriminants --
1991 ----------------------------------
1993 procedure Check_Ancestor_Discriminants
(Anc_Typ
: Entity_Id
) is
1995 Disc_Value
: Node_Id
;
1999 Discr
:= First_Discriminant
(Base_Type
(Anc_Typ
));
2000 while Present
(Discr
) loop
2001 Disc_Value
:= Ancestor_Discriminant_Value
(Discr
);
2003 if Present
(Disc_Value
) then
2004 Cond
:= Make_Op_Ne
(Loc
,
2006 Make_Selected_Component
(Loc
,
2007 Prefix
=> New_Copy_Tree
(Target
),
2008 Selector_Name
=> New_Occurrence_Of
(Discr
, Loc
)),
2009 Right_Opnd
=> Disc_Value
);
2012 Make_Raise_Constraint_Error
(Loc
,
2014 Reason
=> CE_Discriminant_Check_Failed
));
2017 Next_Discriminant
(Discr
);
2019 end Check_Ancestor_Discriminants
;
2021 ---------------------------
2022 -- Compatible_Int_Bounds --
2023 ---------------------------
2025 function Compatible_Int_Bounds
2026 (Agg_Bounds
: Node_Id
;
2027 Typ_Bounds
: Node_Id
) return Boolean
2029 Agg_Lo
: constant Uint
:= Intval
(Low_Bound
(Agg_Bounds
));
2030 Agg_Hi
: constant Uint
:= Intval
(High_Bound
(Agg_Bounds
));
2031 Typ_Lo
: constant Uint
:= Intval
(Low_Bound
(Typ_Bounds
));
2032 Typ_Hi
: constant Uint
:= Intval
(High_Bound
(Typ_Bounds
));
2034 return Typ_Lo
<= Agg_Lo
and then Agg_Hi
<= Typ_Hi
;
2035 end Compatible_Int_Bounds
;
2037 --------------------------------
2038 -- Get_Constraint_Association --
2039 --------------------------------
2041 function Get_Constraint_Association
(T
: Entity_Id
) return Node_Id
is
2042 Typ_Def
: constant Node_Id
:= Type_Definition
(Parent
(T
));
2043 Indic
: constant Node_Id
:= Subtype_Indication
(Typ_Def
);
2046 -- ??? Also need to cover case of a type mark denoting a subtype
2049 if Nkind
(Indic
) = N_Subtype_Indication
2050 and then Present
(Constraint
(Indic
))
2052 return First
(Constraints
(Constraint
(Indic
)));
2056 end Get_Constraint_Association
;
2058 ---------------------
2059 -- Init_Controller --
2060 ---------------------
2062 function Init_Controller
2067 Init_Pr
: Boolean) return List_Id
2069 L
: constant List_Id
:= New_List
;
2072 Target_Type
: Entity_Id
;
2076 -- init-proc (target._controller);
2077 -- initialize (target._controller);
2078 -- Attach_to_Final_List (target._controller, F);
2081 Make_Selected_Component
(Loc
,
2082 Prefix
=> Convert_To
(Typ
, New_Copy_Tree
(Target
)),
2083 Selector_Name
=> Make_Identifier
(Loc
, Name_uController
));
2084 Set_Assignment_OK
(Ref
);
2086 -- Ada 2005 (AI-287): Give support to aggregates of limited types.
2087 -- If the type is intrinsically limited the controller is limited as
2088 -- well. If it is tagged and limited then so is the controller.
2089 -- Otherwise an untagged type may have limited components without its
2090 -- full view being limited, so the controller is not limited.
2092 if Nkind
(Target
) = N_Identifier
then
2093 Target_Type
:= Etype
(Target
);
2095 elsif Nkind
(Target
) = N_Selected_Component
then
2096 Target_Type
:= Etype
(Selector_Name
(Target
));
2098 elsif Nkind
(Target
) = N_Unchecked_Type_Conversion
then
2099 Target_Type
:= Etype
(Target
);
2101 elsif Nkind
(Target
) = N_Unchecked_Expression
2102 and then Nkind
(Expression
(Target
)) = N_Indexed_Component
2104 Target_Type
:= Etype
(Prefix
(Expression
(Target
)));
2107 Target_Type
:= Etype
(Target
);
2110 -- If the target has not been analyzed yet, as will happen with
2111 -- delayed expansion, use the given type (either the aggregate type
2112 -- or an ancestor) to determine limitedness.
2114 if No
(Target_Type
) then
2118 if (Is_Tagged_Type
(Target_Type
))
2119 and then Is_Limited_Type
(Target_Type
)
2121 RC
:= RE_Limited_Record_Controller
;
2123 elsif Is_Immutably_Limited_Type
(Target_Type
) then
2124 RC
:= RE_Limited_Record_Controller
;
2127 RC
:= RE_Record_Controller
;
2132 Build_Initialization_Call
(Loc
,
2135 In_Init_Proc
=> Within_Init_Proc
));
2139 Make_Procedure_Call_Statement
(Loc
,
2142 Find_Prim_Op
(RTE
(RC
), Name_Initialize
), Loc
),
2143 Parameter_Associations
=>
2144 New_List
(New_Copy_Tree
(Ref
))));
2148 Obj_Ref
=> New_Copy_Tree
(Ref
),
2150 With_Attach
=> Attach
));
2153 end Init_Controller
;
2155 -------------------------
2156 -- Is_Int_Range_Bounds --
2157 -------------------------
2159 function Is_Int_Range_Bounds
(Bounds
: Node_Id
) return Boolean is
2161 return Nkind
(Bounds
) = N_Range
2162 and then Nkind
(Low_Bound
(Bounds
)) = N_Integer_Literal
2163 and then Nkind
(High_Bound
(Bounds
)) = N_Integer_Literal
;
2164 end Is_Int_Range_Bounds
;
2166 -------------------------------
2167 -- Gen_Ctrl_Actions_For_Aggr --
2168 -------------------------------
2170 procedure Gen_Ctrl_Actions_For_Aggr
is
2171 Alloc
: Node_Id
:= Empty
;
2174 -- Do the work only the first time this is called
2176 if Ctrl_Stuff_Done
then
2180 Ctrl_Stuff_Done
:= True;
2183 and then Finalize_Storage_Only
(Typ
)
2185 (Is_Library_Level_Entity
(Obj
)
2186 or else Entity
(Constant_Value
(RTE
(RE_Garbage_Collected
))) =
2189 -- why not Is_True (Expr_Value (RTE (RE_Garbaage_Collected) ???
2191 Attach
:= Make_Integer_Literal
(Loc
, 0);
2193 elsif Nkind
(Parent
(N
)) = N_Qualified_Expression
2194 and then Nkind
(Parent
(Parent
(N
))) = N_Allocator
2196 Alloc
:= Parent
(Parent
(N
));
2197 Attach
:= Make_Integer_Literal
(Loc
, 2);
2200 Attach
:= Make_Integer_Literal
(Loc
, 1);
2203 -- Determine the external finalization list. It is either the
2204 -- finalization list of the outer-scope or the one coming from
2205 -- an outer aggregate. When the target is not a temporary, the
2206 -- proper scope is the scope of the target rather than the
2207 -- potentially transient current scope.
2209 if Needs_Finalization
(Typ
) then
2211 -- The current aggregate belongs to an allocator which creates
2212 -- an object through an anonymous access type or acts as the root
2213 -- of a coextension chain.
2217 (Is_Coextension_Root
(Alloc
)
2218 or else Ekind
(Etype
(Alloc
)) = E_Anonymous_Access_Type
)
2220 if No
(Associated_Final_Chain
(Etype
(Alloc
))) then
2221 Build_Final_List
(Alloc
, Etype
(Alloc
));
2224 External_Final_List
:=
2225 Make_Selected_Component
(Loc
,
2228 Associated_Final_Chain
(Etype
(Alloc
)), Loc
),
2229 Selector_Name
=> Make_Identifier
(Loc
, Name_F
));
2231 elsif Present
(Flist
) then
2232 External_Final_List
:= New_Copy_Tree
(Flist
);
2234 elsif Is_Entity_Name
(Target
)
2235 and then Present
(Scope
(Entity
(Target
)))
2237 External_Final_List
:=
2238 Find_Final_List
(Scope
(Entity
(Target
)));
2241 External_Final_List
:= Find_Final_List
(Current_Scope
);
2244 External_Final_List
:= Empty
;
2247 -- Initialize and attach the outer object in the is_controlled case
2249 if Is_Controlled
(Typ
) then
2250 if Ancestor_Is_Subtype_Mark
then
2251 Ref
:= Convert_To
(Init_Typ
, New_Copy_Tree
(Target
));
2252 Set_Assignment_OK
(Ref
);
2254 Make_Procedure_Call_Statement
(Loc
,
2257 (Find_Prim_Op
(Init_Typ
, Name_Initialize
), Loc
),
2258 Parameter_Associations
=> New_List
(New_Copy_Tree
(Ref
))));
2261 if not Has_Controlled_Component
(Typ
) then
2262 Ref
:= New_Copy_Tree
(Target
);
2263 Set_Assignment_OK
(Ref
);
2265 -- This is an aggregate of a coextension. Do not produce a
2266 -- finalization call, but rather attach the reference of the
2267 -- aggregate to its coextension chain.
2270 and then Is_Dynamic_Coextension
(Alloc
)
2272 if No
(Coextensions
(Alloc
)) then
2273 Set_Coextensions
(Alloc
, New_Elmt_List
);
2276 Append_Elmt
(Ref
, Coextensions
(Alloc
));
2281 Flist_Ref
=> New_Copy_Tree
(External_Final_List
),
2282 With_Attach
=> Attach
));
2287 -- In the Has_Controlled component case, all the intermediate
2288 -- controllers must be initialized.
2290 if Has_Controlled_Component
(Typ
)
2291 and not Is_Limited_Ancestor_Expansion
2294 Inner_Typ
: Entity_Id
;
2295 Outer_Typ
: Entity_Id
;
2299 -- Find outer type with a controller
2301 Outer_Typ
:= Base_Type
(Typ
);
2302 while Outer_Typ
/= Init_Typ
2303 and then not Has_New_Controlled_Component
(Outer_Typ
)
2305 Outer_Typ
:= Etype
(Outer_Typ
);
2308 -- Attach it to the outer record controller to the external
2311 if Outer_Typ
= Init_Typ
then
2316 F
=> External_Final_List
,
2321 Inner_Typ
:= Init_Typ
;
2328 F
=> External_Final_List
,
2332 Inner_Typ
:= Etype
(Outer_Typ
);
2334 not Is_Tagged_Type
(Typ
) or else Inner_Typ
= Outer_Typ
;
2337 -- The outer object has to be attached as well
2339 if Is_Controlled
(Typ
) then
2340 Ref
:= New_Copy_Tree
(Target
);
2341 Set_Assignment_OK
(Ref
);
2345 Flist_Ref
=> New_Copy_Tree
(External_Final_List
),
2346 With_Attach
=> New_Copy_Tree
(Attach
)));
2349 -- Initialize the internal controllers for tagged types with
2350 -- more than one controller.
2352 while not At_Root
and then Inner_Typ
/= Init_Typ
loop
2353 if Has_New_Controlled_Component
(Inner_Typ
) then
2355 Make_Selected_Component
(Loc
,
2357 Convert_To
(Outer_Typ
, New_Copy_Tree
(Target
)),
2359 Make_Identifier
(Loc
, Name_uController
));
2361 Make_Selected_Component
(Loc
,
2363 Selector_Name
=> Make_Identifier
(Loc
, Name_F
));
2370 Attach
=> Make_Integer_Literal
(Loc
, 1),
2372 Outer_Typ
:= Inner_Typ
;
2377 At_Root
:= Inner_Typ
= Etype
(Inner_Typ
);
2378 Inner_Typ
:= Etype
(Inner_Typ
);
2381 -- If not done yet attach the controller of the ancestor part
2383 if Outer_Typ
/= Init_Typ
2384 and then Inner_Typ
= Init_Typ
2385 and then Has_Controlled_Component
(Init_Typ
)
2388 Make_Selected_Component
(Loc
,
2389 Prefix
=> Convert_To
(Outer_Typ
, New_Copy_Tree
(Target
)),
2391 Make_Identifier
(Loc
, Name_uController
));
2393 Make_Selected_Component
(Loc
,
2395 Selector_Name
=> Make_Identifier
(Loc
, Name_F
));
2397 Attach
:= Make_Integer_Literal
(Loc
, 1);
2406 -- Note: Init_Pr is False because the ancestor part has
2407 -- already been initialized either way (by default, if
2408 -- given by a type name, otherwise from the expression).
2413 end Gen_Ctrl_Actions_For_Aggr
;
2415 function Rewrite_Discriminant
(Expr
: Node_Id
) return Traverse_Result
;
2416 -- If default expression of a component mentions a discriminant of the
2417 -- type, it must be rewritten as the discriminant of the target object.
2419 function Replace_Type
(Expr
: Node_Id
) return Traverse_Result
;
2420 -- If the aggregate contains a self-reference, traverse each expression
2421 -- to replace a possible self-reference with a reference to the proper
2422 -- component of the target of the assignment.
2424 --------------------------
2425 -- Rewrite_Discriminant --
2426 --------------------------
2428 function Rewrite_Discriminant
(Expr
: Node_Id
) return Traverse_Result
is
2430 if Is_Entity_Name
(Expr
)
2431 and then Present
(Entity
(Expr
))
2432 and then Ekind
(Entity
(Expr
)) = E_In_Parameter
2433 and then Present
(Discriminal_Link
(Entity
(Expr
)))
2434 and then Scope
(Discriminal_Link
(Entity
(Expr
)))
2435 = Base_Type
(Etype
(N
))
2438 Make_Selected_Component
(Loc
,
2439 Prefix
=> New_Copy_Tree
(Lhs
),
2440 Selector_Name
=> Make_Identifier
(Loc
, Chars
(Expr
))));
2443 end Rewrite_Discriminant
;
2449 function Replace_Type
(Expr
: Node_Id
) return Traverse_Result
is
2451 -- Note regarding the Root_Type test below: Aggregate components for
2452 -- self-referential types include attribute references to the current
2453 -- instance, of the form: Typ'access, etc.. These references are
2454 -- rewritten as references to the target of the aggregate: the
2455 -- left-hand side of an assignment, the entity in a declaration,
2456 -- or a temporary. Without this test, we would improperly extended
2457 -- this rewriting to attribute references whose prefix was not the
2458 -- type of the aggregate.
2460 if Nkind
(Expr
) = N_Attribute_Reference
2461 and then Is_Entity_Name
(Prefix
(Expr
))
2462 and then Is_Type
(Entity
(Prefix
(Expr
)))
2463 and then Root_Type
(Etype
(N
)) = Root_Type
(Entity
(Prefix
(Expr
)))
2465 if Is_Entity_Name
(Lhs
) then
2466 Rewrite
(Prefix
(Expr
),
2467 New_Occurrence_Of
(Entity
(Lhs
), Loc
));
2469 elsif Nkind
(Lhs
) = N_Selected_Component
then
2471 Make_Attribute_Reference
(Loc
,
2472 Attribute_Name
=> Name_Unrestricted_Access
,
2473 Prefix
=> New_Copy_Tree
(Prefix
(Lhs
))));
2474 Set_Analyzed
(Parent
(Expr
), False);
2478 Make_Attribute_Reference
(Loc
,
2479 Attribute_Name
=> Name_Unrestricted_Access
,
2480 Prefix
=> New_Copy_Tree
(Lhs
)));
2481 Set_Analyzed
(Parent
(Expr
), False);
2488 procedure Replace_Self_Reference
is
2489 new Traverse_Proc
(Replace_Type
);
2491 procedure Replace_Discriminants
is
2492 new Traverse_Proc
(Rewrite_Discriminant
);
2494 -- Start of processing for Build_Record_Aggr_Code
2497 if Has_Self_Reference
(N
) then
2498 Replace_Self_Reference
(N
);
2501 -- If the target of the aggregate is class-wide, we must convert it
2502 -- to the actual type of the aggregate, so that the proper components
2503 -- are visible. We know already that the types are compatible.
2505 if Present
(Etype
(Lhs
))
2506 and then Is_Class_Wide_Type
(Etype
(Lhs
))
2508 Target
:= Unchecked_Convert_To
(Typ
, Lhs
);
2513 -- Deal with the ancestor part of extension aggregates or with the
2514 -- discriminants of the root type.
2516 if Nkind
(N
) = N_Extension_Aggregate
then
2518 A
: constant Node_Id
:= Ancestor_Part
(N
);
2522 -- If the ancestor part is a subtype mark "T", we generate
2524 -- init-proc (T(tmp)); if T is constrained and
2525 -- init-proc (S(tmp)); where S applies an appropriate
2526 -- constraint if T is unconstrained
2528 if Is_Entity_Name
(A
) and then Is_Type
(Entity
(A
)) then
2529 Ancestor_Is_Subtype_Mark
:= True;
2531 if Is_Constrained
(Entity
(A
)) then
2532 Init_Typ
:= Entity
(A
);
2534 -- For an ancestor part given by an unconstrained type mark,
2535 -- create a subtype constrained by appropriate corresponding
2536 -- discriminant values coming from either associations of the
2537 -- aggregate or a constraint on a parent type. The subtype will
2538 -- be used to generate the correct default value for the
2541 elsif Has_Discriminants
(Entity
(A
)) then
2543 Anc_Typ
: constant Entity_Id
:= Entity
(A
);
2544 Anc_Constr
: constant List_Id
:= New_List
;
2545 Discrim
: Entity_Id
;
2546 Disc_Value
: Node_Id
;
2547 New_Indic
: Node_Id
;
2548 Subt_Decl
: Node_Id
;
2551 Discrim
:= First_Discriminant
(Anc_Typ
);
2552 while Present
(Discrim
) loop
2553 Disc_Value
:= Ancestor_Discriminant_Value
(Discrim
);
2554 Append_To
(Anc_Constr
, Disc_Value
);
2555 Next_Discriminant
(Discrim
);
2559 Make_Subtype_Indication
(Loc
,
2560 Subtype_Mark
=> New_Occurrence_Of
(Anc_Typ
, Loc
),
2562 Make_Index_Or_Discriminant_Constraint
(Loc
,
2563 Constraints
=> Anc_Constr
));
2565 Init_Typ
:= Create_Itype
(Ekind
(Anc_Typ
), N
);
2568 Make_Subtype_Declaration
(Loc
,
2569 Defining_Identifier
=> Init_Typ
,
2570 Subtype_Indication
=> New_Indic
);
2572 -- Itypes must be analyzed with checks off Declaration
2573 -- must have a parent for proper handling of subsidiary
2576 Set_Parent
(Subt_Decl
, N
);
2577 Analyze
(Subt_Decl
, Suppress
=> All_Checks
);
2581 Ref
:= Convert_To
(Init_Typ
, New_Copy_Tree
(Target
));
2582 Set_Assignment_OK
(Ref
);
2584 if not Is_Interface
(Init_Typ
) then
2586 Build_Initialization_Call
(Loc
,
2589 In_Init_Proc
=> Within_Init_Proc
,
2590 With_Default_Init
=> Has_Default_Init_Comps
(N
)
2592 Has_Task
(Base_Type
(Init_Typ
))));
2594 if Is_Constrained
(Entity
(A
))
2595 and then Has_Discriminants
(Entity
(A
))
2597 Check_Ancestor_Discriminants
(Entity
(A
));
2601 -- Handle calls to C++ constructors
2603 elsif Is_CPP_Constructor_Call
(A
) then
2604 Init_Typ
:= Etype
(A
);
2605 Ref
:= Convert_To
(Init_Typ
, New_Copy_Tree
(Target
));
2606 Set_Assignment_OK
(Ref
);
2609 Build_Initialization_Call
(Loc
,
2612 In_Init_Proc
=> Within_Init_Proc
,
2613 With_Default_Init
=> Has_Default_Init_Comps
(N
),
2614 Constructor_Ref
=> A
));
2616 -- Ada 2005 (AI-287): If the ancestor part is an aggregate of
2617 -- limited type, a recursive call expands the ancestor. Note that
2618 -- in the limited case, the ancestor part must be either a
2619 -- function call (possibly qualified, or wrapped in an unchecked
2620 -- conversion) or aggregate (definitely qualified).
2621 -- The ancestor part can also be a function call (that may be
2622 -- transformed into an explicit dereference) or a qualification
2625 elsif Is_Limited_Type
(Etype
(A
))
2626 and then Nkind_In
(Unqualify
(A
), N_Aggregate
,
2627 N_Extension_Aggregate
)
2629 Ancestor_Is_Expression
:= True;
2631 -- Set up finalization data for enclosing record, because
2632 -- controlled subcomponents of the ancestor part will be
2635 Gen_Ctrl_Actions_For_Aggr
;
2638 Build_Record_Aggr_Code
(
2640 Typ
=> Etype
(Unqualify
(A
)),
2644 Is_Limited_Ancestor_Expansion
=> True));
2646 -- If the ancestor part is an expression "E", we generate
2650 -- In Ada 2005, this includes the case of a (possibly qualified)
2651 -- limited function call. The assignment will turn into a
2652 -- build-in-place function call (for further details, see
2653 -- Make_Build_In_Place_Call_In_Assignment).
2656 Ancestor_Is_Expression
:= True;
2657 Init_Typ
:= Etype
(A
);
2659 -- If the ancestor part is an aggregate, force its full
2660 -- expansion, which was delayed.
2662 if Nkind_In
(Unqualify
(A
), N_Aggregate
,
2663 N_Extension_Aggregate
)
2665 Set_Analyzed
(A
, False);
2666 Set_Analyzed
(Expression
(A
), False);
2669 Ref
:= Convert_To
(Init_Typ
, New_Copy_Tree
(Target
));
2670 Set_Assignment_OK
(Ref
);
2672 -- Make the assignment without usual controlled actions since
2673 -- we only want the post adjust but not the pre finalize here
2674 -- Add manual adjust when necessary.
2676 Assign
:= New_List
(
2677 Make_OK_Assignment_Statement
(Loc
,
2680 Set_No_Ctrl_Actions
(First
(Assign
));
2682 -- Assign the tag now to make sure that the dispatching call in
2683 -- the subsequent deep_adjust works properly (unless VM_Target,
2684 -- where tags are implicit).
2686 if Tagged_Type_Expansion
then
2688 Make_OK_Assignment_Statement
(Loc
,
2690 Make_Selected_Component
(Loc
,
2691 Prefix
=> New_Copy_Tree
(Target
),
2694 (First_Tag_Component
(Base_Type
(Typ
)), Loc
)),
2697 Unchecked_Convert_To
(RTE
(RE_Tag
),
2700 (Access_Disp_Table
(Base_Type
(Typ
)))),
2703 Set_Assignment_OK
(Name
(Instr
));
2704 Append_To
(Assign
, Instr
);
2706 -- Ada 2005 (AI-251): If tagged type has progenitors we must
2707 -- also initialize tags of the secondary dispatch tables.
2709 if Has_Interfaces
(Base_Type
(Typ
)) then
2711 (Typ
=> Base_Type
(Typ
),
2713 Stmts_List
=> Assign
);
2717 -- Call Adjust manually
2719 if Needs_Finalization
(Etype
(A
))
2720 and then not Is_Limited_Type
(Etype
(A
))
2722 Append_List_To
(Assign
,
2724 Ref
=> New_Copy_Tree
(Ref
),
2726 Flist_Ref
=> New_Reference_To
(
2727 RTE
(RE_Global_Final_List
), Loc
),
2728 With_Attach
=> Make_Integer_Literal
(Loc
, 0)));
2732 Make_Unsuppress_Block
(Loc
, Name_Discriminant_Check
, Assign
));
2734 if Has_Discriminants
(Init_Typ
) then
2735 Check_Ancestor_Discriminants
(Init_Typ
);
2740 -- Normal case (not an extension aggregate)
2743 -- Generate the discriminant expressions, component by component.
2744 -- If the base type is an unchecked union, the discriminants are
2745 -- unknown to the back-end and absent from a value of the type, so
2746 -- assignments for them are not emitted.
2748 if Has_Discriminants
(Typ
)
2749 and then not Is_Unchecked_Union
(Base_Type
(Typ
))
2751 -- If the type is derived, and constrains discriminants of the
2752 -- parent type, these discriminants are not components of the
2753 -- aggregate, and must be initialized explicitly. They are not
2754 -- visible components of the object, but can become visible with
2755 -- a view conversion to the ancestor.
2759 Parent_Type
: Entity_Id
;
2761 Discr_Val
: Elmt_Id
;
2764 Btype
:= Base_Type
(Typ
);
2765 while Is_Derived_Type
(Btype
)
2766 and then Present
(Stored_Constraint
(Btype
))
2768 Parent_Type
:= Etype
(Btype
);
2770 Disc
:= First_Discriminant
(Parent_Type
);
2772 First_Elmt
(Stored_Constraint
(Base_Type
(Typ
)));
2773 while Present
(Discr_Val
) loop
2775 -- Only those discriminants of the parent that are not
2776 -- renamed by discriminants of the derived type need to
2777 -- be added explicitly.
2779 if not Is_Entity_Name
(Node
(Discr_Val
))
2781 Ekind
(Entity
(Node
(Discr_Val
))) /= E_Discriminant
2784 Make_Selected_Component
(Loc
,
2785 Prefix
=> New_Copy_Tree
(Target
),
2786 Selector_Name
=> New_Occurrence_Of
(Disc
, Loc
));
2789 Make_OK_Assignment_Statement
(Loc
,
2791 Expression
=> New_Copy_Tree
(Node
(Discr_Val
)));
2793 Set_No_Ctrl_Actions
(Instr
);
2794 Append_To
(L
, Instr
);
2797 Next_Discriminant
(Disc
);
2798 Next_Elmt
(Discr_Val
);
2801 Btype
:= Base_Type
(Parent_Type
);
2805 -- Generate discriminant init values for the visible discriminants
2808 Discriminant
: Entity_Id
;
2809 Discriminant_Value
: Node_Id
;
2812 Discriminant
:= First_Stored_Discriminant
(Typ
);
2813 while Present
(Discriminant
) loop
2815 Make_Selected_Component
(Loc
,
2816 Prefix
=> New_Copy_Tree
(Target
),
2817 Selector_Name
=> New_Occurrence_Of
(Discriminant
, Loc
));
2819 Discriminant_Value
:=
2820 Get_Discriminant_Value
(
2823 Discriminant_Constraint
(N_Typ
));
2826 Make_OK_Assignment_Statement
(Loc
,
2828 Expression
=> New_Copy_Tree
(Discriminant_Value
));
2830 Set_No_Ctrl_Actions
(Instr
);
2831 Append_To
(L
, Instr
);
2833 Next_Stored_Discriminant
(Discriminant
);
2839 -- For CPP types we generate an implicit call to the C++ default
2840 -- constructor to ensure the proper initialization of the _Tag
2843 if Is_CPP_Class
(Root_Type
(Typ
))
2844 and then CPP_Num_Prims
(Typ
) > 0
2846 Invoke_Constructor
: declare
2847 CPP_Parent
: constant Entity_Id
:=
2848 Enclosing_CPP_Parent
(Typ
);
2850 procedure Invoke_IC_Proc
(T
: Entity_Id
);
2851 -- Recursive routine used to climb to parents. Required because
2852 -- parents must be initialized before descendants to ensure
2853 -- propagation of inherited C++ slots.
2855 --------------------
2856 -- Invoke_IC_Proc --
2857 --------------------
2859 procedure Invoke_IC_Proc
(T
: Entity_Id
) is
2861 -- Avoid generating extra calls. Initialization required
2862 -- only for types defined from the level of derivation of
2863 -- type of the constructor and the type of the aggregate.
2865 if T
= CPP_Parent
then
2869 Invoke_IC_Proc
(Etype
(T
));
2871 -- Generate call to the IC routine
2873 if Present
(CPP_Init_Proc
(T
)) then
2875 Make_Procedure_Call_Statement
(Loc
,
2876 New_Reference_To
(CPP_Init_Proc
(T
), Loc
)));
2880 -- Start of processing for Invoke_Constructor
2883 -- Implicit invocation of the C++ constructor
2885 if Nkind
(N
) = N_Aggregate
then
2887 Make_Procedure_Call_Statement
(Loc
,
2890 (Base_Init_Proc
(CPP_Parent
), Loc
),
2891 Parameter_Associations
=> New_List
(
2892 Unchecked_Convert_To
(CPP_Parent
,
2893 New_Copy_Tree
(Lhs
)))));
2896 Invoke_IC_Proc
(Typ
);
2897 end Invoke_Constructor
;
2900 -- Generate the assignments, component by component
2902 -- tmp.comp1 := Expr1_From_Aggr;
2903 -- tmp.comp2 := Expr2_From_Aggr;
2906 Comp
:= First
(Component_Associations
(N
));
2907 while Present
(Comp
) loop
2908 Selector
:= Entity
(First
(Choices
(Comp
)));
2912 if Is_CPP_Constructor_Call
(Expression
(Comp
)) then
2914 Build_Initialization_Call
(Loc
,
2915 Id_Ref
=> Make_Selected_Component
(Loc
,
2916 Prefix
=> New_Copy_Tree
(Target
),
2918 New_Occurrence_Of
(Selector
, Loc
)),
2919 Typ
=> Etype
(Selector
),
2921 With_Default_Init
=> True,
2922 Constructor_Ref
=> Expression
(Comp
)));
2924 -- Ada 2005 (AI-287): For each default-initialized component generate
2925 -- a call to the corresponding IP subprogram if available.
2927 elsif Box_Present
(Comp
)
2928 and then Has_Non_Null_Base_Init_Proc
(Etype
(Selector
))
2930 if Ekind
(Selector
) /= E_Discriminant
then
2931 Gen_Ctrl_Actions_For_Aggr
;
2934 -- Ada 2005 (AI-287): If the component type has tasks then
2935 -- generate the activation chain and master entities (except
2936 -- in case of an allocator because in that case these entities
2937 -- are generated by Build_Task_Allocate_Block_With_Init_Stmts).
2940 Ctype
: constant Entity_Id
:= Etype
(Selector
);
2941 Inside_Allocator
: Boolean := False;
2942 P
: Node_Id
:= Parent
(N
);
2945 if Is_Task_Type
(Ctype
) or else Has_Task
(Ctype
) then
2946 while Present
(P
) loop
2947 if Nkind
(P
) = N_Allocator
then
2948 Inside_Allocator
:= True;
2955 if not Inside_Init_Proc
and not Inside_Allocator
then
2956 Build_Activation_Chain_Entity
(N
);
2962 Build_Initialization_Call
(Loc
,
2963 Id_Ref
=> Make_Selected_Component
(Loc
,
2964 Prefix
=> New_Copy_Tree
(Target
),
2966 New_Occurrence_Of
(Selector
, Loc
)),
2967 Typ
=> Etype
(Selector
),
2969 With_Default_Init
=> True));
2971 -- Prepare for component assignment
2973 elsif Ekind
(Selector
) /= E_Discriminant
2974 or else Nkind
(N
) = N_Extension_Aggregate
2976 -- All the discriminants have now been assigned
2978 -- This is now a good moment to initialize and attach all the
2979 -- controllers. Their position may depend on the discriminants.
2981 if Ekind
(Selector
) /= E_Discriminant
then
2982 Gen_Ctrl_Actions_For_Aggr
;
2985 Comp_Type
:= Etype
(Selector
);
2987 Make_Selected_Component
(Loc
,
2988 Prefix
=> New_Copy_Tree
(Target
),
2989 Selector_Name
=> New_Occurrence_Of
(Selector
, Loc
));
2991 if Nkind
(Expression
(Comp
)) = N_Qualified_Expression
then
2992 Expr_Q
:= Expression
(Expression
(Comp
));
2994 Expr_Q
:= Expression
(Comp
);
2997 -- The controller is the one of the parent type defining the
2998 -- component (in case of inherited components).
3000 if Needs_Finalization
(Comp_Type
) then
3001 Internal_Final_List
:=
3002 Make_Selected_Component
(Loc
,
3003 Prefix
=> Convert_To
3004 (Scope
(Original_Record_Component
(Selector
)),
3005 New_Copy_Tree
(Target
)),
3006 Selector_Name
=> Make_Identifier
(Loc
, Name_uController
));
3008 Internal_Final_List
:=
3009 Make_Selected_Component
(Loc
,
3010 Prefix
=> Internal_Final_List
,
3011 Selector_Name
=> Make_Identifier
(Loc
, Name_F
));
3013 -- The internal final list can be part of a constant object
3015 Set_Assignment_OK
(Internal_Final_List
);
3018 Internal_Final_List
:= Empty
;
3021 -- Now either create the assignment or generate the code for the
3022 -- inner aggregate top-down.
3024 if Is_Delayed_Aggregate
(Expr_Q
) then
3026 -- We have the following case of aggregate nesting inside
3027 -- an object declaration:
3029 -- type Arr_Typ is array (Integer range <>) of ...;
3031 -- type Rec_Typ (...) is record
3032 -- Obj_Arr_Typ : Arr_Typ (A .. B);
3035 -- Obj_Rec_Typ : Rec_Typ := (...,
3036 -- Obj_Arr_Typ => (X => (...), Y => (...)));
3038 -- The length of the ranges of the aggregate and Obj_Add_Typ
3039 -- are equal (B - A = Y - X), but they do not coincide (X /=
3040 -- A and B /= Y). This case requires array sliding which is
3041 -- performed in the following manner:
3043 -- subtype Arr_Sub is Arr_Typ (X .. Y);
3045 -- Temp (X) := (...);
3047 -- Temp (Y) := (...);
3048 -- Obj_Rec_Typ.Obj_Arr_Typ := Temp;
3050 if Ekind
(Comp_Type
) = E_Array_Subtype
3051 and then Is_Int_Range_Bounds
(Aggregate_Bounds
(Expr_Q
))
3052 and then Is_Int_Range_Bounds
(First_Index
(Comp_Type
))
3054 Compatible_Int_Bounds
3055 (Agg_Bounds
=> Aggregate_Bounds
(Expr_Q
),
3056 Typ_Bounds
=> First_Index
(Comp_Type
))
3058 -- Create the array subtype with bounds equal to those of
3059 -- the corresponding aggregate.
3062 SubE
: constant Entity_Id
:= Make_Temporary
(Loc
, 'T');
3064 SubD
: constant Node_Id
:=
3065 Make_Subtype_Declaration
(Loc
,
3066 Defining_Identifier
=> SubE
,
3067 Subtype_Indication
=>
3068 Make_Subtype_Indication
(Loc
,
3071 (Etype
(Comp_Type
), Loc
),
3073 Make_Index_Or_Discriminant_Constraint
3075 Constraints
=> New_List
(
3077 (Aggregate_Bounds
(Expr_Q
))))));
3079 -- Create a temporary array of the above subtype which
3080 -- will be used to capture the aggregate assignments.
3082 TmpE
: constant Entity_Id
:= Make_Temporary
(Loc
, 'A', N
);
3084 TmpD
: constant Node_Id
:=
3085 Make_Object_Declaration
(Loc
,
3086 Defining_Identifier
=> TmpE
,
3087 Object_Definition
=>
3088 New_Reference_To
(SubE
, Loc
));
3091 Set_No_Initialization
(TmpD
);
3092 Append_To
(L
, SubD
);
3093 Append_To
(L
, TmpD
);
3095 -- Expand aggregate into assignments to the temp array
3098 Late_Expansion
(Expr_Q
, Comp_Type
,
3099 New_Reference_To
(TmpE
, Loc
), Internal_Final_List
));
3104 Make_Assignment_Statement
(Loc
,
3105 Name
=> New_Copy_Tree
(Comp_Expr
),
3106 Expression
=> New_Reference_To
(TmpE
, Loc
)));
3108 -- Do not pass the original aggregate to Gigi as is,
3109 -- since it will potentially clobber the front or the end
3110 -- of the array. Setting the expression to empty is safe
3111 -- since all aggregates are expanded into assignments.
3113 if Present
(Obj
) then
3114 Set_Expression
(Parent
(Obj
), Empty
);
3118 -- Normal case (sliding not required)
3122 Late_Expansion
(Expr_Q
, Comp_Type
, Comp_Expr
,
3123 Internal_Final_List
));
3126 -- Expr_Q is not delayed aggregate
3129 if Has_Discriminants
(Typ
) then
3130 Replace_Discriminants
(Expr_Q
);
3134 Make_OK_Assignment_Statement
(Loc
,
3136 Expression
=> Expr_Q
);
3138 Set_No_Ctrl_Actions
(Instr
);
3139 Append_To
(L
, Instr
);
3141 -- Adjust the tag if tagged (because of possible view
3142 -- conversions), unless compiling for a VM where tags are
3145 -- tmp.comp._tag := comp_typ'tag;
3147 if Is_Tagged_Type
(Comp_Type
)
3148 and then Tagged_Type_Expansion
3151 Make_OK_Assignment_Statement
(Loc
,
3153 Make_Selected_Component
(Loc
,
3154 Prefix
=> New_Copy_Tree
(Comp_Expr
),
3157 (First_Tag_Component
(Comp_Type
), Loc
)),
3160 Unchecked_Convert_To
(RTE
(RE_Tag
),
3162 (Node
(First_Elmt
(Access_Disp_Table
(Comp_Type
))),
3165 Append_To
(L
, Instr
);
3168 -- Adjust and Attach the component to the proper controller
3170 -- Adjust (tmp.comp);
3171 -- Attach_To_Final_List (tmp.comp,
3172 -- comp_typ (tmp)._record_controller.f)
3174 if Needs_Finalization
(Comp_Type
)
3175 and then not Is_Limited_Type
(Comp_Type
)
3179 Ref
=> New_Copy_Tree
(Comp_Expr
),
3181 Flist_Ref
=> Internal_Final_List
,
3182 With_Attach
=> Make_Integer_Literal
(Loc
, 1)));
3188 elsif Ekind
(Selector
) = E_Discriminant
3189 and then Nkind
(N
) /= N_Extension_Aggregate
3190 and then Nkind
(Parent
(N
)) = N_Component_Association
3191 and then Is_Constrained
(Typ
)
3193 -- We must check that the discriminant value imposed by the
3194 -- context is the same as the value given in the subaggregate,
3195 -- because after the expansion into assignments there is no
3196 -- record on which to perform a regular discriminant check.
3203 D_Val
:= First_Elmt
(Discriminant_Constraint
(Typ
));
3204 Disc
:= First_Discriminant
(Typ
);
3205 while Chars
(Disc
) /= Chars
(Selector
) loop
3206 Next_Discriminant
(Disc
);
3210 pragma Assert
(Present
(D_Val
));
3212 -- This check cannot performed for components that are
3213 -- constrained by a current instance, because this is not a
3214 -- value that can be compared with the actual constraint.
3216 if Nkind
(Node
(D_Val
)) /= N_Attribute_Reference
3217 or else not Is_Entity_Name
(Prefix
(Node
(D_Val
)))
3218 or else not Is_Type
(Entity
(Prefix
(Node
(D_Val
))))
3221 Make_Raise_Constraint_Error
(Loc
,
3224 Left_Opnd
=> New_Copy_Tree
(Node
(D_Val
)),
3225 Right_Opnd
=> Expression
(Comp
)),
3226 Reason
=> CE_Discriminant_Check_Failed
));
3229 -- Find self-reference in previous discriminant assignment,
3230 -- and replace with proper expression.
3237 while Present
(Ass
) loop
3238 if Nkind
(Ass
) = N_Assignment_Statement
3239 and then Nkind
(Name
(Ass
)) = N_Selected_Component
3240 and then Chars
(Selector_Name
(Name
(Ass
))) =
3244 (Ass
, New_Copy_Tree
(Expression
(Comp
)));
3257 -- If the type is tagged, the tag needs to be initialized (unless
3258 -- compiling for the Java VM where tags are implicit). It is done
3259 -- late in the initialization process because in some cases, we call
3260 -- the init proc of an ancestor which will not leave out the right tag
3262 if Ancestor_Is_Expression
then
3265 -- For CPP types we generated a call to the C++ default constructor
3266 -- before the components have been initialized to ensure the proper
3267 -- initialization of the _Tag component (see above).
3269 elsif Is_CPP_Class
(Typ
) then
3272 elsif Is_Tagged_Type
(Typ
) and then Tagged_Type_Expansion
then
3274 Make_OK_Assignment_Statement
(Loc
,
3276 Make_Selected_Component
(Loc
,
3277 Prefix
=> New_Copy_Tree
(Target
),
3280 (First_Tag_Component
(Base_Type
(Typ
)), Loc
)),
3283 Unchecked_Convert_To
(RTE
(RE_Tag
),
3285 (Node
(First_Elmt
(Access_Disp_Table
(Base_Type
(Typ
)))),
3288 Append_To
(L
, Instr
);
3290 -- Ada 2005 (AI-251): If the tagged type has been derived from
3291 -- abstract interfaces we must also initialize the tags of the
3292 -- secondary dispatch tables.
3294 if Has_Interfaces
(Base_Type
(Typ
)) then
3296 (Typ
=> Base_Type
(Typ
),
3302 -- If the controllers have not been initialized yet (by lack of non-
3303 -- discriminant components), let's do it now.
3305 Gen_Ctrl_Actions_For_Aggr
;
3308 end Build_Record_Aggr_Code
;
3310 -------------------------------
3311 -- Convert_Aggr_In_Allocator --
3312 -------------------------------
3314 procedure Convert_Aggr_In_Allocator
3319 Loc
: constant Source_Ptr
:= Sloc
(Aggr
);
3320 Typ
: constant Entity_Id
:= Etype
(Aggr
);
3321 Temp
: constant Entity_Id
:= Defining_Identifier
(Decl
);
3323 Occ
: constant Node_Id
:=
3324 Unchecked_Convert_To
(Typ
,
3325 Make_Explicit_Dereference
(Loc
,
3326 New_Reference_To
(Temp
, Loc
)));
3328 Access_Type
: constant Entity_Id
:= Etype
(Temp
);
3332 -- If the allocator is for an access discriminant, there is no
3333 -- finalization list for the anonymous access type, and the eventual
3334 -- finalization of the object is handled through the coextension
3335 -- mechanism. If the enclosing object is not dynamically allocated,
3336 -- the access discriminant is itself placed on the stack. Otherwise,
3337 -- some other finalization list is used (see exp_ch4.adb).
3339 -- Decl has been inserted in the code ahead of the allocator, using
3340 -- Insert_Actions. We use Insert_Actions below as well, to ensure that
3341 -- subsequent insertions are done in the proper order. Using (for
3342 -- example) Insert_Actions_After to place the expanded aggregate
3343 -- immediately after Decl may lead to out-of-order references if the
3344 -- allocator has generated a finalization list, as when the designated
3345 -- object is controlled and there is an open transient scope.
3347 if Ekind
(Access_Type
) = E_Anonymous_Access_Type
3348 and then Nkind
(Associated_Node_For_Itype
(Access_Type
)) =
3349 N_Discriminant_Specification
3353 elsif Needs_Finalization
(Typ
) then
3354 Flist
:= Find_Final_List
(Access_Type
);
3356 -- Otherwise there are no controlled actions to be performed.
3362 if Is_Array_Type
(Typ
) then
3363 Convert_Array_Aggr_In_Allocator
(Decl
, Aggr
, Occ
);
3365 elsif Has_Default_Init_Comps
(Aggr
) then
3367 L
: constant List_Id
:= New_List
;
3368 Init_Stmts
: List_Id
;
3375 Associated_Final_Chain
(Base_Type
(Access_Type
)));
3377 -- ??? Dubious actual for Obj: expect 'the original object being
3380 if Has_Task
(Typ
) then
3381 Build_Task_Allocate_Block_With_Init_Stmts
(L
, Aggr
, Init_Stmts
);
3382 Insert_Actions
(Alloc
, L
);
3384 Insert_Actions
(Alloc
, Init_Stmts
);
3389 Insert_Actions
(Alloc
,
3391 (Aggr
, Typ
, Occ
, Flist
,
3392 Associated_Final_Chain
(Base_Type
(Access_Type
))));
3394 -- ??? Dubious actual for Obj: expect 'the original object being
3398 end Convert_Aggr_In_Allocator
;
3400 --------------------------------
3401 -- Convert_Aggr_In_Assignment --
3402 --------------------------------
3404 procedure Convert_Aggr_In_Assignment
(N
: Node_Id
) is
3405 Aggr
: Node_Id
:= Expression
(N
);
3406 Typ
: constant Entity_Id
:= Etype
(Aggr
);
3407 Occ
: constant Node_Id
:= New_Copy_Tree
(Name
(N
));
3410 if Nkind
(Aggr
) = N_Qualified_Expression
then
3411 Aggr
:= Expression
(Aggr
);
3414 Insert_Actions_After
(N
,
3417 Find_Final_List
(Typ
, New_Copy_Tree
(Occ
))));
3418 end Convert_Aggr_In_Assignment
;
3420 ---------------------------------
3421 -- Convert_Aggr_In_Object_Decl --
3422 ---------------------------------
3424 procedure Convert_Aggr_In_Object_Decl
(N
: Node_Id
) is
3425 Obj
: constant Entity_Id
:= Defining_Identifier
(N
);
3426 Aggr
: Node_Id
:= Expression
(N
);
3427 Loc
: constant Source_Ptr
:= Sloc
(Aggr
);
3428 Typ
: constant Entity_Id
:= Etype
(Aggr
);
3429 Occ
: constant Node_Id
:= New_Occurrence_Of
(Obj
, Loc
);
3431 function Discriminants_Ok
return Boolean;
3432 -- If the object type is constrained, the discriminants in the
3433 -- aggregate must be checked against the discriminants of the subtype.
3434 -- This cannot be done using Apply_Discriminant_Checks because after
3435 -- expansion there is no aggregate left to check.
3437 ----------------------
3438 -- Discriminants_Ok --
3439 ----------------------
3441 function Discriminants_Ok
return Boolean is
3442 Cond
: Node_Id
:= Empty
;
3451 D
:= First_Discriminant
(Typ
);
3452 Disc1
:= First_Elmt
(Discriminant_Constraint
(Typ
));
3453 Disc2
:= First_Elmt
(Discriminant_Constraint
(Etype
(Obj
)));
3454 while Present
(Disc1
) and then Present
(Disc2
) loop
3455 Val1
:= Node
(Disc1
);
3456 Val2
:= Node
(Disc2
);
3458 if not Is_OK_Static_Expression
(Val1
)
3459 or else not Is_OK_Static_Expression
(Val2
)
3461 Check
:= Make_Op_Ne
(Loc
,
3462 Left_Opnd
=> Duplicate_Subexpr
(Val1
),
3463 Right_Opnd
=> Duplicate_Subexpr
(Val2
));
3469 Cond
:= Make_Or_Else
(Loc
,
3471 Right_Opnd
=> Check
);
3474 elsif Expr_Value
(Val1
) /= Expr_Value
(Val2
) then
3475 Apply_Compile_Time_Constraint_Error
(Aggr
,
3476 Msg
=> "incorrect value for discriminant&?",
3477 Reason
=> CE_Discriminant_Check_Failed
,
3482 Next_Discriminant
(D
);
3487 -- If any discriminant constraint is non-static, emit a check
3489 if Present
(Cond
) then
3491 Make_Raise_Constraint_Error
(Loc
,
3493 Reason
=> CE_Discriminant_Check_Failed
));
3497 end Discriminants_Ok
;
3499 -- Start of processing for Convert_Aggr_In_Object_Decl
3502 Set_Assignment_OK
(Occ
);
3504 if Nkind
(Aggr
) = N_Qualified_Expression
then
3505 Aggr
:= Expression
(Aggr
);
3508 if Has_Discriminants
(Typ
)
3509 and then Typ
/= Etype
(Obj
)
3510 and then Is_Constrained
(Etype
(Obj
))
3511 and then not Discriminants_Ok
3516 -- If the context is an extended return statement, it has its own
3517 -- finalization machinery (i.e. works like a transient scope) and
3518 -- we do not want to create an additional one, because objects on
3519 -- the finalization list of the return must be moved to the caller's
3520 -- finalization list to complete the return.
3522 -- However, if the aggregate is limited, it is built in place, and the
3523 -- controlled components are not assigned to intermediate temporaries
3524 -- so there is no need for a transient scope in this case either.
3526 if Requires_Transient_Scope
(Typ
)
3527 and then Ekind
(Current_Scope
) /= E_Return_Statement
3528 and then not Is_Limited_Type
(Typ
)
3530 Establish_Transient_Scope
3533 Is_Controlled
(Typ
) or else Has_Controlled_Component
(Typ
));
3536 Insert_Actions_After
(N
, Late_Expansion
(Aggr
, Typ
, Occ
, Obj
=> Obj
));
3537 Set_No_Initialization
(N
);
3538 Initialize_Discriminants
(N
, Typ
);
3539 end Convert_Aggr_In_Object_Decl
;
3541 -------------------------------------
3542 -- Convert_Array_Aggr_In_Allocator --
3543 -------------------------------------
3545 procedure Convert_Array_Aggr_In_Allocator
3550 Aggr_Code
: List_Id
;
3551 Typ
: constant Entity_Id
:= Etype
(Aggr
);
3552 Ctyp
: constant Entity_Id
:= Component_Type
(Typ
);
3555 -- The target is an explicit dereference of the allocated object.
3556 -- Generate component assignments to it, as for an aggregate that
3557 -- appears on the right-hand side of an assignment statement.
3560 Build_Array_Aggr_Code
(Aggr
,
3562 Index
=> First_Index
(Typ
),
3564 Scalar_Comp
=> Is_Scalar_Type
(Ctyp
));
3566 Insert_Actions_After
(Decl
, Aggr_Code
);
3567 end Convert_Array_Aggr_In_Allocator
;
3569 ----------------------------
3570 -- Convert_To_Assignments --
3571 ----------------------------
3573 procedure Convert_To_Assignments
(N
: Node_Id
; Typ
: Entity_Id
) is
3574 Loc
: constant Source_Ptr
:= Sloc
(N
);
3579 Target_Expr
: Node_Id
;
3580 Parent_Kind
: Node_Kind
;
3581 Unc_Decl
: Boolean := False;
3582 Parent_Node
: Node_Id
;
3585 pragma Assert
(not Is_Static_Dispatch_Table_Aggregate
(N
));
3586 pragma Assert
(Is_Record_Type
(Typ
));
3588 Parent_Node
:= Parent
(N
);
3589 Parent_Kind
:= Nkind
(Parent_Node
);
3591 if Parent_Kind
= N_Qualified_Expression
then
3593 -- Check if we are in a unconstrained declaration because in this
3594 -- case the current delayed expansion mechanism doesn't work when
3595 -- the declared object size depend on the initializing expr.
3598 Parent_Node
:= Parent
(Parent_Node
);
3599 Parent_Kind
:= Nkind
(Parent_Node
);
3601 if Parent_Kind
= N_Object_Declaration
then
3603 not Is_Entity_Name
(Object_Definition
(Parent_Node
))
3604 or else Has_Discriminants
3605 (Entity
(Object_Definition
(Parent_Node
)))
3606 or else Is_Class_Wide_Type
3607 (Entity
(Object_Definition
(Parent_Node
)));
3612 -- Just set the Delay flag in the cases where the transformation will be
3613 -- done top down from above.
3617 -- Internal aggregate (transformed when expanding the parent)
3619 or else Parent_Kind
= N_Aggregate
3620 or else Parent_Kind
= N_Extension_Aggregate
3621 or else Parent_Kind
= N_Component_Association
3623 -- Allocator (see Convert_Aggr_In_Allocator)
3625 or else Parent_Kind
= N_Allocator
3627 -- Object declaration (see Convert_Aggr_In_Object_Decl)
3629 or else (Parent_Kind
= N_Object_Declaration
and then not Unc_Decl
)
3631 -- Safe assignment (see Convert_Aggr_Assignments). So far only the
3632 -- assignments in init procs are taken into account.
3634 or else (Parent_Kind
= N_Assignment_Statement
3635 and then Inside_Init_Proc
)
3637 -- (Ada 2005) An inherently limited type in a return statement,
3638 -- which will be handled in a build-in-place fashion, and may be
3639 -- rewritten as an extended return and have its own finalization
3640 -- machinery. In the case of a simple return, the aggregate needs
3641 -- to be delayed until the scope for the return statement has been
3642 -- created, so that any finalization chain will be associated with
3643 -- that scope. For extended returns, we delay expansion to avoid the
3644 -- creation of an unwanted transient scope that could result in
3645 -- premature finalization of the return object (which is built in
3646 -- in place within the caller's scope).
3649 (Is_Immutably_Limited_Type
(Typ
)
3651 (Nkind
(Parent
(Parent_Node
)) = N_Extended_Return_Statement
3652 or else Nkind
(Parent_Node
) = N_Simple_Return_Statement
))
3654 Set_Expansion_Delayed
(N
);
3658 if Requires_Transient_Scope
(Typ
) then
3659 Establish_Transient_Scope
3661 Is_Controlled
(Typ
) or else Has_Controlled_Component
(Typ
));
3664 -- If the aggregate is non-limited, create a temporary. If it is limited
3665 -- and the context is an assignment, this is a subaggregate for an
3666 -- enclosing aggregate being expanded. It must be built in place, so use
3667 -- the target of the current assignment.
3669 if Is_Limited_Type
(Typ
)
3670 and then Nkind
(Parent
(N
)) = N_Assignment_Statement
3672 Target_Expr
:= New_Copy_Tree
(Name
(Parent
(N
)));
3674 (Parent
(N
), Build_Record_Aggr_Code
(N
, Typ
, Target_Expr
));
3675 Rewrite
(Parent
(N
), Make_Null_Statement
(Loc
));
3678 Temp
:= Make_Temporary
(Loc
, 'A', N
);
3680 -- If the type inherits unknown discriminants, use the view with
3681 -- known discriminants if available.
3683 if Has_Unknown_Discriminants
(Typ
)
3684 and then Present
(Underlying_Record_View
(Typ
))
3686 T
:= Underlying_Record_View
(Typ
);
3692 Make_Object_Declaration
(Loc
,
3693 Defining_Identifier
=> Temp
,
3694 Object_Definition
=> New_Occurrence_Of
(T
, Loc
));
3696 Set_No_Initialization
(Instr
);
3697 Insert_Action
(N
, Instr
);
3698 Initialize_Discriminants
(Instr
, T
);
3699 Target_Expr
:= New_Occurrence_Of
(Temp
, Loc
);
3700 Insert_Actions
(N
, Build_Record_Aggr_Code
(N
, T
, Target_Expr
));
3701 Rewrite
(N
, New_Occurrence_Of
(Temp
, Loc
));
3702 Analyze_And_Resolve
(N
, T
);
3704 end Convert_To_Assignments
;
3706 ---------------------------
3707 -- Convert_To_Positional --
3708 ---------------------------
3710 procedure Convert_To_Positional
3712 Max_Others_Replicate
: Nat
:= 5;
3713 Handle_Bit_Packed
: Boolean := False)
3715 Typ
: constant Entity_Id
:= Etype
(N
);
3717 Static_Components
: Boolean := True;
3719 procedure Check_Static_Components
;
3720 -- Check whether all components of the aggregate are compile-time known
3721 -- values, and can be passed as is to the back-end without further
3727 Ixb
: Node_Id
) return Boolean;
3728 -- Convert the aggregate into a purely positional form if possible. On
3729 -- entry the bounds of all dimensions are known to be static, and the
3730 -- total number of components is safe enough to expand.
3732 function Is_Flat
(N
: Node_Id
; Dims
: Int
) return Boolean;
3733 -- Return True iff the array N is flat (which is not trivial in the case
3734 -- of multidimensional aggregates).
3736 -----------------------------
3737 -- Check_Static_Components --
3738 -----------------------------
3740 procedure Check_Static_Components
is
3744 Static_Components
:= True;
3746 if Nkind
(N
) = N_String_Literal
then
3749 elsif Present
(Expressions
(N
)) then
3750 Expr
:= First
(Expressions
(N
));
3751 while Present
(Expr
) loop
3752 if Nkind
(Expr
) /= N_Aggregate
3753 or else not Compile_Time_Known_Aggregate
(Expr
)
3754 or else Expansion_Delayed
(Expr
)
3756 Static_Components
:= False;
3764 if Nkind
(N
) = N_Aggregate
3765 and then Present
(Component_Associations
(N
))
3767 Expr
:= First
(Component_Associations
(N
));
3768 while Present
(Expr
) loop
3769 if Nkind_In
(Expression
(Expr
), N_Integer_Literal
,
3774 elsif Is_Entity_Name
(Expression
(Expr
))
3775 and then Present
(Entity
(Expression
(Expr
)))
3776 and then Ekind
(Entity
(Expression
(Expr
))) =
3777 E_Enumeration_Literal
3781 elsif Nkind
(Expression
(Expr
)) /= N_Aggregate
3782 or else not Compile_Time_Known_Aggregate
(Expression
(Expr
))
3783 or else Expansion_Delayed
(Expression
(Expr
))
3785 Static_Components
:= False;
3792 end Check_Static_Components
;
3801 Ixb
: Node_Id
) return Boolean
3803 Loc
: constant Source_Ptr
:= Sloc
(N
);
3804 Blo
: constant Node_Id
:= Type_Low_Bound
(Etype
(Ixb
));
3805 Lo
: constant Node_Id
:= Type_Low_Bound
(Etype
(Ix
));
3806 Hi
: constant Node_Id
:= Type_High_Bound
(Etype
(Ix
));
3811 if Nkind
(Original_Node
(N
)) = N_String_Literal
then
3815 if not Compile_Time_Known_Value
(Lo
)
3816 or else not Compile_Time_Known_Value
(Hi
)
3821 Lov
:= Expr_Value
(Lo
);
3822 Hiv
:= Expr_Value
(Hi
);
3825 or else not Compile_Time_Known_Value
(Blo
)
3830 -- Determine if set of alternatives is suitable for conversion and
3831 -- build an array containing the values in sequence.
3834 Vals
: array (UI_To_Int
(Lov
) .. UI_To_Int
(Hiv
))
3835 of Node_Id
:= (others => Empty
);
3836 -- The values in the aggregate sorted appropriately
3839 -- Same data as Vals in list form
3842 -- Used to validate Max_Others_Replicate limit
3845 Num
: Int
:= UI_To_Int
(Lov
);
3851 if Present
(Expressions
(N
)) then
3852 Elmt
:= First
(Expressions
(N
));
3853 while Present
(Elmt
) loop
3854 if Nkind
(Elmt
) = N_Aggregate
3855 and then Present
(Next_Index
(Ix
))
3857 not Flatten
(Elmt
, Next_Index
(Ix
), Next_Index
(Ixb
))
3862 Vals
(Num
) := Relocate_Node
(Elmt
);
3869 if No
(Component_Associations
(N
)) then
3873 Elmt
:= First
(Component_Associations
(N
));
3875 if Nkind
(Expression
(Elmt
)) = N_Aggregate
then
3876 if Present
(Next_Index
(Ix
))
3879 (Expression
(Elmt
), Next_Index
(Ix
), Next_Index
(Ixb
))
3885 Component_Loop
: while Present
(Elmt
) loop
3886 Choice
:= First
(Choices
(Elmt
));
3887 Choice_Loop
: while Present
(Choice
) loop
3889 -- If we have an others choice, fill in the missing elements
3890 -- subject to the limit established by Max_Others_Replicate.
3892 if Nkind
(Choice
) = N_Others_Choice
then
3895 for J
in Vals
'Range loop
3896 if No
(Vals
(J
)) then
3897 Vals
(J
) := New_Copy_Tree
(Expression
(Elmt
));
3898 Rep_Count
:= Rep_Count
+ 1;
3900 -- Check for maximum others replication. Note that
3901 -- we skip this test if either of the restrictions
3902 -- No_Elaboration_Code or No_Implicit_Loops is
3903 -- active, if this is a preelaborable unit or a
3904 -- predefined unit. This ensures that predefined
3905 -- units get the same level of constant folding in
3906 -- Ada 95 and Ada 05, where their categorization
3910 P
: constant Entity_Id
:=
3911 Cunit_Entity
(Current_Sem_Unit
);
3914 -- Check if duplication OK and if so continue
3917 if Restriction_Active
(No_Elaboration_Code
)
3918 or else Restriction_Active
(No_Implicit_Loops
)
3919 or else Is_Preelaborated
(P
)
3920 or else (Ekind
(P
) = E_Package_Body
3922 Is_Preelaborated
(Spec_Entity
(P
)))
3924 Is_Predefined_File_Name
3925 (Unit_File_Name
(Get_Source_Unit
(P
)))
3929 -- If duplication not OK, then we return False
3930 -- if the replication count is too high
3932 elsif Rep_Count
> Max_Others_Replicate
then
3935 -- Continue on if duplication not OK, but the
3936 -- replication count is not excessive.
3945 exit Component_Loop
;
3947 -- Case of a subtype mark, identifier or expanded name
3949 elsif Is_Entity_Name
(Choice
)
3950 and then Is_Type
(Entity
(Choice
))
3952 Lo
:= Type_Low_Bound
(Etype
(Choice
));
3953 Hi
:= Type_High_Bound
(Etype
(Choice
));
3955 -- Case of subtype indication
3957 elsif Nkind
(Choice
) = N_Subtype_Indication
then
3958 Lo
:= Low_Bound
(Range_Expression
(Constraint
(Choice
)));
3959 Hi
:= High_Bound
(Range_Expression
(Constraint
(Choice
)));
3963 elsif Nkind
(Choice
) = N_Range
then
3964 Lo
:= Low_Bound
(Choice
);
3965 Hi
:= High_Bound
(Choice
);
3967 -- Normal subexpression case
3969 else pragma Assert
(Nkind
(Choice
) in N_Subexpr
);
3970 if not Compile_Time_Known_Value
(Choice
) then
3974 Choice_Index
:= UI_To_Int
(Expr_Value
(Choice
));
3975 if Choice_Index
in Vals
'Range then
3976 Vals
(Choice_Index
) :=
3977 New_Copy_Tree
(Expression
(Elmt
));
3981 -- Choice is statically out-of-range, will be
3982 -- rewritten to raise Constraint_Error.
3989 -- Range cases merge with Lo,Hi set
3991 if not Compile_Time_Known_Value
(Lo
)
3993 not Compile_Time_Known_Value
(Hi
)
3997 for J
in UI_To_Int
(Expr_Value
(Lo
)) ..
3998 UI_To_Int
(Expr_Value
(Hi
))
4000 Vals
(J
) := New_Copy_Tree
(Expression
(Elmt
));
4006 end loop Choice_Loop
;
4009 end loop Component_Loop
;
4011 -- If we get here the conversion is possible
4014 for J
in Vals
'Range loop
4015 Append
(Vals
(J
), Vlist
);
4018 Rewrite
(N
, Make_Aggregate
(Loc
, Expressions
=> Vlist
));
4019 Set_Aggregate_Bounds
(N
, Aggregate_Bounds
(Original_Node
(N
)));
4028 function Is_Flat
(N
: Node_Id
; Dims
: Int
) return Boolean is
4035 elsif Nkind
(N
) = N_Aggregate
then
4036 if Present
(Component_Associations
(N
)) then
4040 Elmt
:= First
(Expressions
(N
));
4041 while Present
(Elmt
) loop
4042 if not Is_Flat
(Elmt
, Dims
- 1) then
4056 -- Start of processing for Convert_To_Positional
4059 -- Ada 2005 (AI-287): Do not convert in case of default initialized
4060 -- components because in this case will need to call the corresponding
4063 if Has_Default_Init_Comps
(N
) then
4067 if Is_Flat
(N
, Number_Dimensions
(Typ
)) then
4071 if Is_Bit_Packed_Array
(Typ
)
4072 and then not Handle_Bit_Packed
4077 -- Do not convert to positional if controlled components are involved
4078 -- since these require special processing
4080 if Has_Controlled_Component
(Typ
) then
4084 Check_Static_Components
;
4086 -- If the size is known, or all the components are static, try to
4087 -- build a fully positional aggregate.
4089 -- The size of the type may not be known for an aggregate with
4090 -- discriminated array components, but if the components are static
4091 -- it is still possible to verify statically that the length is
4092 -- compatible with the upper bound of the type, and therefore it is
4093 -- worth flattening such aggregates as well.
4095 -- For now the back-end expands these aggregates into individual
4096 -- assignments to the target anyway, but it is conceivable that
4097 -- it will eventually be able to treat such aggregates statically???
4099 if Aggr_Size_OK
(N
, Typ
)
4100 and then Flatten
(N
, First_Index
(Typ
), First_Index
(Base_Type
(Typ
)))
4102 if Static_Components
then
4103 Set_Compile_Time_Known_Aggregate
(N
);
4104 Set_Expansion_Delayed
(N
, False);
4107 Analyze_And_Resolve
(N
, Typ
);
4109 end Convert_To_Positional
;
4111 ----------------------------
4112 -- Expand_Array_Aggregate --
4113 ----------------------------
4115 -- Array aggregate expansion proceeds as follows:
4117 -- 1. If requested we generate code to perform all the array aggregate
4118 -- bound checks, specifically
4120 -- (a) Check that the index range defined by aggregate bounds is
4121 -- compatible with corresponding index subtype.
4123 -- (b) If an others choice is present check that no aggregate
4124 -- index is outside the bounds of the index constraint.
4126 -- (c) For multidimensional arrays make sure that all subaggregates
4127 -- corresponding to the same dimension have the same bounds.
4129 -- 2. Check for packed array aggregate which can be converted to a
4130 -- constant so that the aggregate disappeares completely.
4132 -- 3. Check case of nested aggregate. Generally nested aggregates are
4133 -- handled during the processing of the parent aggregate.
4135 -- 4. Check if the aggregate can be statically processed. If this is the
4136 -- case pass it as is to Gigi. Note that a necessary condition for
4137 -- static processing is that the aggregate be fully positional.
4139 -- 5. If in place aggregate expansion is possible (i.e. no need to create
4140 -- a temporary) then mark the aggregate as such and return. Otherwise
4141 -- create a new temporary and generate the appropriate initialization
4144 procedure Expand_Array_Aggregate
(N
: Node_Id
) is
4145 Loc
: constant Source_Ptr
:= Sloc
(N
);
4147 Typ
: constant Entity_Id
:= Etype
(N
);
4148 Ctyp
: constant Entity_Id
:= Component_Type
(Typ
);
4149 -- Typ is the correct constrained array subtype of the aggregate
4150 -- Ctyp is the corresponding component type.
4152 Aggr_Dimension
: constant Pos
:= Number_Dimensions
(Typ
);
4153 -- Number of aggregate index dimensions
4155 Aggr_Low
: array (1 .. Aggr_Dimension
) of Node_Id
;
4156 Aggr_High
: array (1 .. Aggr_Dimension
) of Node_Id
;
4157 -- Low and High bounds of the constraint for each aggregate index
4159 Aggr_Index_Typ
: array (1 .. Aggr_Dimension
) of Entity_Id
;
4160 -- The type of each index
4162 Maybe_In_Place_OK
: Boolean;
4163 -- If the type is neither controlled nor packed and the aggregate
4164 -- is the expression in an assignment, assignment in place may be
4165 -- possible, provided other conditions are met on the LHS.
4167 Others_Present
: array (1 .. Aggr_Dimension
) of Boolean :=
4169 -- If Others_Present (J) is True, then there is an others choice
4170 -- in one of the sub-aggregates of N at dimension J.
4172 procedure Build_Constrained_Type
(Positional
: Boolean);
4173 -- If the subtype is not static or unconstrained, build a constrained
4174 -- type using the computable sizes of the aggregate and its sub-
4177 procedure Check_Bounds
(Aggr_Bounds
: Node_Id
; Index_Bounds
: Node_Id
);
4178 -- Checks that the bounds of Aggr_Bounds are within the bounds defined
4181 procedure Check_Same_Aggr_Bounds
(Sub_Aggr
: Node_Id
; Dim
: Pos
);
4182 -- Checks that in a multi-dimensional array aggregate all subaggregates
4183 -- corresponding to the same dimension have the same bounds.
4184 -- Sub_Aggr is an array sub-aggregate. Dim is the dimension
4185 -- corresponding to the sub-aggregate.
4187 procedure Compute_Others_Present
(Sub_Aggr
: Node_Id
; Dim
: Pos
);
4188 -- Computes the values of array Others_Present. Sub_Aggr is the
4189 -- array sub-aggregate we start the computation from. Dim is the
4190 -- dimension corresponding to the sub-aggregate.
4192 function In_Place_Assign_OK
return Boolean;
4193 -- Simple predicate to determine whether an aggregate assignment can
4194 -- be done in place, because none of the new values can depend on the
4195 -- components of the target of the assignment.
4197 procedure Others_Check
(Sub_Aggr
: Node_Id
; Dim
: Pos
);
4198 -- Checks that if an others choice is present in any sub-aggregate no
4199 -- aggregate index is outside the bounds of the index constraint.
4200 -- Sub_Aggr is an array sub-aggregate. Dim is the dimension
4201 -- corresponding to the sub-aggregate.
4203 function Safe_Left_Hand_Side
(N
: Node_Id
) return Boolean;
4204 -- In addition to Maybe_In_Place_OK, in order for an aggregate to be
4205 -- built directly into the target of the assignment it must be free
4208 ----------------------------
4209 -- Build_Constrained_Type --
4210 ----------------------------
4212 procedure Build_Constrained_Type
(Positional
: Boolean) is
4213 Loc
: constant Source_Ptr
:= Sloc
(N
);
4214 Agg_Type
: constant Entity_Id
:= Make_Temporary
(Loc
, 'A');
4217 Typ
: constant Entity_Id
:= Etype
(N
);
4218 Indexes
: constant List_Id
:= New_List
;
4223 -- If the aggregate is purely positional, all its subaggregates
4224 -- have the same size. We collect the dimensions from the first
4225 -- subaggregate at each level.
4230 for D
in 1 .. Number_Dimensions
(Typ
) loop
4231 Sub_Agg
:= First
(Expressions
(Sub_Agg
));
4235 while Present
(Comp
) loop
4242 Low_Bound
=> Make_Integer_Literal
(Loc
, 1),
4243 High_Bound
=> Make_Integer_Literal
(Loc
, Num
)));
4247 -- We know the aggregate type is unconstrained and the aggregate
4248 -- is not processable by the back end, therefore not necessarily
4249 -- positional. Retrieve each dimension bounds (computed earlier).
4251 for D
in 1 .. Number_Dimensions
(Typ
) loop
4254 Low_Bound
=> Aggr_Low
(D
),
4255 High_Bound
=> Aggr_High
(D
)),
4261 Make_Full_Type_Declaration
(Loc
,
4262 Defining_Identifier
=> Agg_Type
,
4264 Make_Constrained_Array_Definition
(Loc
,
4265 Discrete_Subtype_Definitions
=> Indexes
,
4266 Component_Definition
=>
4267 Make_Component_Definition
(Loc
,
4268 Aliased_Present
=> False,
4269 Subtype_Indication
=>
4270 New_Occurrence_Of
(Component_Type
(Typ
), Loc
))));
4272 Insert_Action
(N
, Decl
);
4274 Set_Etype
(N
, Agg_Type
);
4275 Set_Is_Itype
(Agg_Type
);
4276 Freeze_Itype
(Agg_Type
, N
);
4277 end Build_Constrained_Type
;
4283 procedure Check_Bounds
(Aggr_Bounds
: Node_Id
; Index_Bounds
: Node_Id
) is
4290 Cond
: Node_Id
:= Empty
;
4293 Get_Index_Bounds
(Aggr_Bounds
, Aggr_Lo
, Aggr_Hi
);
4294 Get_Index_Bounds
(Index_Bounds
, Ind_Lo
, Ind_Hi
);
4296 -- Generate the following test:
4298 -- [constraint_error when
4299 -- Aggr_Lo <= Aggr_Hi and then
4300 -- (Aggr_Lo < Ind_Lo or else Aggr_Hi > Ind_Hi)]
4302 -- As an optimization try to see if some tests are trivially vacuous
4303 -- because we are comparing an expression against itself.
4305 if Aggr_Lo
= Ind_Lo
and then Aggr_Hi
= Ind_Hi
then
4308 elsif Aggr_Hi
= Ind_Hi
then
4311 Left_Opnd
=> Duplicate_Subexpr_Move_Checks
(Aggr_Lo
),
4312 Right_Opnd
=> Duplicate_Subexpr_Move_Checks
(Ind_Lo
));
4314 elsif Aggr_Lo
= Ind_Lo
then
4317 Left_Opnd
=> Duplicate_Subexpr_Move_Checks
(Aggr_Hi
),
4318 Right_Opnd
=> Duplicate_Subexpr_Move_Checks
(Ind_Hi
));
4325 Left_Opnd
=> Duplicate_Subexpr_Move_Checks
(Aggr_Lo
),
4326 Right_Opnd
=> Duplicate_Subexpr_Move_Checks
(Ind_Lo
)),
4330 Left_Opnd
=> Duplicate_Subexpr
(Aggr_Hi
),
4331 Right_Opnd
=> Duplicate_Subexpr
(Ind_Hi
)));
4334 if Present
(Cond
) then
4339 Left_Opnd
=> Duplicate_Subexpr_Move_Checks
(Aggr_Lo
),
4340 Right_Opnd
=> Duplicate_Subexpr_Move_Checks
(Aggr_Hi
)),
4342 Right_Opnd
=> Cond
);
4344 Set_Analyzed
(Left_Opnd
(Left_Opnd
(Cond
)), False);
4345 Set_Analyzed
(Right_Opnd
(Left_Opnd
(Cond
)), False);
4347 Make_Raise_Constraint_Error
(Loc
,
4349 Reason
=> CE_Length_Check_Failed
));
4353 ----------------------------
4354 -- Check_Same_Aggr_Bounds --
4355 ----------------------------
4357 procedure Check_Same_Aggr_Bounds
(Sub_Aggr
: Node_Id
; Dim
: Pos
) is
4358 Sub_Lo
: constant Node_Id
:= Low_Bound
(Aggregate_Bounds
(Sub_Aggr
));
4359 Sub_Hi
: constant Node_Id
:= High_Bound
(Aggregate_Bounds
(Sub_Aggr
));
4360 -- The bounds of this specific sub-aggregate
4362 Aggr_Lo
: constant Node_Id
:= Aggr_Low
(Dim
);
4363 Aggr_Hi
: constant Node_Id
:= Aggr_High
(Dim
);
4364 -- The bounds of the aggregate for this dimension
4366 Ind_Typ
: constant Entity_Id
:= Aggr_Index_Typ
(Dim
);
4367 -- The index type for this dimension.xxx
4369 Cond
: Node_Id
:= Empty
;
4374 -- If index checks are on generate the test
4376 -- [constraint_error when
4377 -- Aggr_Lo /= Sub_Lo or else Aggr_Hi /= Sub_Hi]
4379 -- As an optimization try to see if some tests are trivially vacuos
4380 -- because we are comparing an expression against itself. Also for
4381 -- the first dimension the test is trivially vacuous because there
4382 -- is just one aggregate for dimension 1.
4384 if Index_Checks_Suppressed
(Ind_Typ
) then
4388 or else (Aggr_Lo
= Sub_Lo
and then Aggr_Hi
= Sub_Hi
)
4392 elsif Aggr_Hi
= Sub_Hi
then
4395 Left_Opnd
=> Duplicate_Subexpr_Move_Checks
(Aggr_Lo
),
4396 Right_Opnd
=> Duplicate_Subexpr_Move_Checks
(Sub_Lo
));
4398 elsif Aggr_Lo
= Sub_Lo
then
4401 Left_Opnd
=> Duplicate_Subexpr_Move_Checks
(Aggr_Hi
),
4402 Right_Opnd
=> Duplicate_Subexpr_Move_Checks
(Sub_Hi
));
4409 Left_Opnd
=> Duplicate_Subexpr_Move_Checks
(Aggr_Lo
),
4410 Right_Opnd
=> Duplicate_Subexpr_Move_Checks
(Sub_Lo
)),
4414 Left_Opnd
=> Duplicate_Subexpr
(Aggr_Hi
),
4415 Right_Opnd
=> Duplicate_Subexpr
(Sub_Hi
)));
4418 if Present
(Cond
) then
4420 Make_Raise_Constraint_Error
(Loc
,
4422 Reason
=> CE_Length_Check_Failed
));
4425 -- Now look inside the sub-aggregate to see if there is more work
4427 if Dim
< Aggr_Dimension
then
4429 -- Process positional components
4431 if Present
(Expressions
(Sub_Aggr
)) then
4432 Expr
:= First
(Expressions
(Sub_Aggr
));
4433 while Present
(Expr
) loop
4434 Check_Same_Aggr_Bounds
(Expr
, Dim
+ 1);
4439 -- Process component associations
4441 if Present
(Component_Associations
(Sub_Aggr
)) then
4442 Assoc
:= First
(Component_Associations
(Sub_Aggr
));
4443 while Present
(Assoc
) loop
4444 Expr
:= Expression
(Assoc
);
4445 Check_Same_Aggr_Bounds
(Expr
, Dim
+ 1);
4450 end Check_Same_Aggr_Bounds
;
4452 ----------------------------
4453 -- Compute_Others_Present --
4454 ----------------------------
4456 procedure Compute_Others_Present
(Sub_Aggr
: Node_Id
; Dim
: Pos
) is
4461 if Present
(Component_Associations
(Sub_Aggr
)) then
4462 Assoc
:= Last
(Component_Associations
(Sub_Aggr
));
4464 if Nkind
(First
(Choices
(Assoc
))) = N_Others_Choice
then
4465 Others_Present
(Dim
) := True;
4469 -- Now look inside the sub-aggregate to see if there is more work
4471 if Dim
< Aggr_Dimension
then
4473 -- Process positional components
4475 if Present
(Expressions
(Sub_Aggr
)) then
4476 Expr
:= First
(Expressions
(Sub_Aggr
));
4477 while Present
(Expr
) loop
4478 Compute_Others_Present
(Expr
, Dim
+ 1);
4483 -- Process component associations
4485 if Present
(Component_Associations
(Sub_Aggr
)) then
4486 Assoc
:= First
(Component_Associations
(Sub_Aggr
));
4487 while Present
(Assoc
) loop
4488 Expr
:= Expression
(Assoc
);
4489 Compute_Others_Present
(Expr
, Dim
+ 1);
4494 end Compute_Others_Present
;
4496 ------------------------
4497 -- In_Place_Assign_OK --
4498 ------------------------
4500 function In_Place_Assign_OK
return Boolean is
4508 function Is_Others_Aggregate
(Aggr
: Node_Id
) return Boolean;
4509 -- Aggregates that consist of a single Others choice are safe
4510 -- if the single expression is.
4512 function Safe_Aggregate
(Aggr
: Node_Id
) return Boolean;
4513 -- Check recursively that each component of a (sub)aggregate does
4514 -- not depend on the variable being assigned to.
4516 function Safe_Component
(Expr
: Node_Id
) return Boolean;
4517 -- Verify that an expression cannot depend on the variable being
4518 -- assigned to. Room for improvement here (but less than before).
4520 -------------------------
4521 -- Is_Others_Aggregate --
4522 -------------------------
4524 function Is_Others_Aggregate
(Aggr
: Node_Id
) return Boolean is
4526 return No
(Expressions
(Aggr
))
4528 (First
(Choices
(First
(Component_Associations
(Aggr
)))))
4530 end Is_Others_Aggregate
;
4532 --------------------
4533 -- Safe_Aggregate --
4534 --------------------
4536 function Safe_Aggregate
(Aggr
: Node_Id
) return Boolean is
4540 if Present
(Expressions
(Aggr
)) then
4541 Expr
:= First
(Expressions
(Aggr
));
4542 while Present
(Expr
) loop
4543 if Nkind
(Expr
) = N_Aggregate
then
4544 if not Safe_Aggregate
(Expr
) then
4548 elsif not Safe_Component
(Expr
) then
4556 if Present
(Component_Associations
(Aggr
)) then
4557 Expr
:= First
(Component_Associations
(Aggr
));
4558 while Present
(Expr
) loop
4559 if Nkind
(Expression
(Expr
)) = N_Aggregate
then
4560 if not Safe_Aggregate
(Expression
(Expr
)) then
4564 elsif not Safe_Component
(Expression
(Expr
)) then
4575 --------------------
4576 -- Safe_Component --
4577 --------------------
4579 function Safe_Component
(Expr
: Node_Id
) return Boolean is
4580 Comp
: Node_Id
:= Expr
;
4582 function Check_Component
(Comp
: Node_Id
) return Boolean;
4583 -- Do the recursive traversal, after copy
4585 ---------------------
4586 -- Check_Component --
4587 ---------------------
4589 function Check_Component
(Comp
: Node_Id
) return Boolean is
4591 if Is_Overloaded
(Comp
) then
4595 return Compile_Time_Known_Value
(Comp
)
4597 or else (Is_Entity_Name
(Comp
)
4598 and then Present
(Entity
(Comp
))
4599 and then No
(Renamed_Object
(Entity
(Comp
))))
4601 or else (Nkind
(Comp
) = N_Attribute_Reference
4602 and then Check_Component
(Prefix
(Comp
)))
4604 or else (Nkind
(Comp
) in N_Binary_Op
4605 and then Check_Component
(Left_Opnd
(Comp
))
4606 and then Check_Component
(Right_Opnd
(Comp
)))
4608 or else (Nkind
(Comp
) in N_Unary_Op
4609 and then Check_Component
(Right_Opnd
(Comp
)))
4611 or else (Nkind
(Comp
) = N_Selected_Component
4612 and then Check_Component
(Prefix
(Comp
)))
4614 or else (Nkind
(Comp
) = N_Unchecked_Type_Conversion
4615 and then Check_Component
(Expression
(Comp
)));
4616 end Check_Component
;
4618 -- Start of processing for Safe_Component
4621 -- If the component appears in an association that may
4622 -- correspond to more than one element, it is not analyzed
4623 -- before the expansion into assignments, to avoid side effects.
4624 -- We analyze, but do not resolve the copy, to obtain sufficient
4625 -- entity information for the checks that follow. If component is
4626 -- overloaded we assume an unsafe function call.
4628 if not Analyzed
(Comp
) then
4629 if Is_Overloaded
(Expr
) then
4632 elsif Nkind
(Expr
) = N_Aggregate
4633 and then not Is_Others_Aggregate
(Expr
)
4637 elsif Nkind
(Expr
) = N_Allocator
then
4639 -- For now, too complex to analyze
4644 Comp
:= New_Copy_Tree
(Expr
);
4645 Set_Parent
(Comp
, Parent
(Expr
));
4649 if Nkind
(Comp
) = N_Aggregate
then
4650 return Safe_Aggregate
(Comp
);
4652 return Check_Component
(Comp
);
4656 -- Start of processing for In_Place_Assign_OK
4659 if Present
(Component_Associations
(N
)) then
4661 -- On assignment, sliding can take place, so we cannot do the
4662 -- assignment in place unless the bounds of the aggregate are
4663 -- statically equal to those of the target.
4665 -- If the aggregate is given by an others choice, the bounds
4666 -- are derived from the left-hand side, and the assignment is
4667 -- safe if the expression is.
4669 if Is_Others_Aggregate
(N
) then
4672 (Expression
(First
(Component_Associations
(N
))));
4675 Aggr_In
:= First_Index
(Etype
(N
));
4677 if Nkind
(Parent
(N
)) = N_Assignment_Statement
then
4678 Obj_In
:= First_Index
(Etype
(Name
(Parent
(N
))));
4681 -- Context is an allocator. Check bounds of aggregate
4682 -- against given type in qualified expression.
4684 pragma Assert
(Nkind
(Parent
(Parent
(N
))) = N_Allocator
);
4686 First_Index
(Etype
(Entity
(Subtype_Mark
(Parent
(N
)))));
4689 while Present
(Aggr_In
) loop
4690 Get_Index_Bounds
(Aggr_In
, Aggr_Lo
, Aggr_Hi
);
4691 Get_Index_Bounds
(Obj_In
, Obj_Lo
, Obj_Hi
);
4693 if not Compile_Time_Known_Value
(Aggr_Lo
)
4694 or else not Compile_Time_Known_Value
(Aggr_Hi
)
4695 or else not Compile_Time_Known_Value
(Obj_Lo
)
4696 or else not Compile_Time_Known_Value
(Obj_Hi
)
4697 or else Expr_Value
(Aggr_Lo
) /= Expr_Value
(Obj_Lo
)
4698 or else Expr_Value
(Aggr_Hi
) /= Expr_Value
(Obj_Hi
)
4703 Next_Index
(Aggr_In
);
4704 Next_Index
(Obj_In
);
4708 -- Now check the component values themselves
4710 return Safe_Aggregate
(N
);
4711 end In_Place_Assign_OK
;
4717 procedure Others_Check
(Sub_Aggr
: Node_Id
; Dim
: Pos
) is
4718 Aggr_Lo
: constant Node_Id
:= Aggr_Low
(Dim
);
4719 Aggr_Hi
: constant Node_Id
:= Aggr_High
(Dim
);
4720 -- The bounds of the aggregate for this dimension
4722 Ind_Typ
: constant Entity_Id
:= Aggr_Index_Typ
(Dim
);
4723 -- The index type for this dimension
4725 Need_To_Check
: Boolean := False;
4727 Choices_Lo
: Node_Id
:= Empty
;
4728 Choices_Hi
: Node_Id
:= Empty
;
4729 -- The lowest and highest discrete choices for a named sub-aggregate
4731 Nb_Choices
: Int
:= -1;
4732 -- The number of discrete non-others choices in this sub-aggregate
4734 Nb_Elements
: Uint
:= Uint_0
;
4735 -- The number of elements in a positional aggregate
4737 Cond
: Node_Id
:= Empty
;
4744 -- Check if we have an others choice. If we do make sure that this
4745 -- sub-aggregate contains at least one element in addition to the
4748 if Range_Checks_Suppressed
(Ind_Typ
) then
4749 Need_To_Check
:= False;
4751 elsif Present
(Expressions
(Sub_Aggr
))
4752 and then Present
(Component_Associations
(Sub_Aggr
))
4754 Need_To_Check
:= True;
4756 elsif Present
(Component_Associations
(Sub_Aggr
)) then
4757 Assoc
:= Last
(Component_Associations
(Sub_Aggr
));
4759 if Nkind
(First
(Choices
(Assoc
))) /= N_Others_Choice
then
4760 Need_To_Check
:= False;
4763 -- Count the number of discrete choices. Start with -1 because
4764 -- the others choice does not count.
4767 Assoc
:= First
(Component_Associations
(Sub_Aggr
));
4768 while Present
(Assoc
) loop
4769 Choice
:= First
(Choices
(Assoc
));
4770 while Present
(Choice
) loop
4771 Nb_Choices
:= Nb_Choices
+ 1;
4778 -- If there is only an others choice nothing to do
4780 Need_To_Check
:= (Nb_Choices
> 0);
4784 Need_To_Check
:= False;
4787 -- If we are dealing with a positional sub-aggregate with an others
4788 -- choice then compute the number or positional elements.
4790 if Need_To_Check
and then Present
(Expressions
(Sub_Aggr
)) then
4791 Expr
:= First
(Expressions
(Sub_Aggr
));
4792 Nb_Elements
:= Uint_0
;
4793 while Present
(Expr
) loop
4794 Nb_Elements
:= Nb_Elements
+ 1;
4798 -- If the aggregate contains discrete choices and an others choice
4799 -- compute the smallest and largest discrete choice values.
4801 elsif Need_To_Check
then
4802 Compute_Choices_Lo_And_Choices_Hi
: declare
4804 Table
: Case_Table_Type
(1 .. Nb_Choices
);
4805 -- Used to sort all the different choice values
4812 Assoc
:= First
(Component_Associations
(Sub_Aggr
));
4813 while Present
(Assoc
) loop
4814 Choice
:= First
(Choices
(Assoc
));
4815 while Present
(Choice
) loop
4816 if Nkind
(Choice
) = N_Others_Choice
then
4820 Get_Index_Bounds
(Choice
, Low
, High
);
4821 Table
(J
).Choice_Lo
:= Low
;
4822 Table
(J
).Choice_Hi
:= High
;
4831 -- Sort the discrete choices
4833 Sort_Case_Table
(Table
);
4835 Choices_Lo
:= Table
(1).Choice_Lo
;
4836 Choices_Hi
:= Table
(Nb_Choices
).Choice_Hi
;
4837 end Compute_Choices_Lo_And_Choices_Hi
;
4840 -- If no others choice in this sub-aggregate, or the aggregate
4841 -- comprises only an others choice, nothing to do.
4843 if not Need_To_Check
then
4846 -- If we are dealing with an aggregate containing an others choice
4847 -- and positional components, we generate the following test:
4849 -- if Ind_Typ'Pos (Aggr_Lo) + (Nb_Elements - 1) >
4850 -- Ind_Typ'Pos (Aggr_Hi)
4852 -- raise Constraint_Error;
4855 elsif Nb_Elements
> Uint_0
then
4861 Make_Attribute_Reference
(Loc
,
4862 Prefix
=> New_Reference_To
(Ind_Typ
, Loc
),
4863 Attribute_Name
=> Name_Pos
,
4866 (Duplicate_Subexpr_Move_Checks
(Aggr_Lo
))),
4867 Right_Opnd
=> Make_Integer_Literal
(Loc
, Nb_Elements
- 1)),
4870 Make_Attribute_Reference
(Loc
,
4871 Prefix
=> New_Reference_To
(Ind_Typ
, Loc
),
4872 Attribute_Name
=> Name_Pos
,
4873 Expressions
=> New_List
(
4874 Duplicate_Subexpr_Move_Checks
(Aggr_Hi
))));
4876 -- If we are dealing with an aggregate containing an others choice
4877 -- and discrete choices we generate the following test:
4879 -- [constraint_error when
4880 -- Choices_Lo < Aggr_Lo or else Choices_Hi > Aggr_Hi];
4888 Duplicate_Subexpr_Move_Checks
(Choices_Lo
),
4890 Duplicate_Subexpr_Move_Checks
(Aggr_Lo
)),
4895 Duplicate_Subexpr
(Choices_Hi
),
4897 Duplicate_Subexpr
(Aggr_Hi
)));
4900 if Present
(Cond
) then
4902 Make_Raise_Constraint_Error
(Loc
,
4904 Reason
=> CE_Length_Check_Failed
));
4905 -- Questionable reason code, shouldn't that be a
4906 -- CE_Range_Check_Failed ???
4909 -- Now look inside the sub-aggregate to see if there is more work
4911 if Dim
< Aggr_Dimension
then
4913 -- Process positional components
4915 if Present
(Expressions
(Sub_Aggr
)) then
4916 Expr
:= First
(Expressions
(Sub_Aggr
));
4917 while Present
(Expr
) loop
4918 Others_Check
(Expr
, Dim
+ 1);
4923 -- Process component associations
4925 if Present
(Component_Associations
(Sub_Aggr
)) then
4926 Assoc
:= First
(Component_Associations
(Sub_Aggr
));
4927 while Present
(Assoc
) loop
4928 Expr
:= Expression
(Assoc
);
4929 Others_Check
(Expr
, Dim
+ 1);
4936 -------------------------
4937 -- Safe_Left_Hand_Side --
4938 -------------------------
4940 function Safe_Left_Hand_Side
(N
: Node_Id
) return Boolean is
4941 function Is_Safe_Index
(Indx
: Node_Id
) return Boolean;
4942 -- If the left-hand side includes an indexed component, check that
4943 -- the indexes are free of side-effect.
4949 function Is_Safe_Index
(Indx
: Node_Id
) return Boolean is
4951 if Is_Entity_Name
(Indx
) then
4954 elsif Nkind
(Indx
) = N_Integer_Literal
then
4957 elsif Nkind
(Indx
) = N_Function_Call
4958 and then Is_Entity_Name
(Name
(Indx
))
4960 Has_Pragma_Pure_Function
(Entity
(Name
(Indx
)))
4964 elsif Nkind
(Indx
) = N_Type_Conversion
4965 and then Is_Safe_Index
(Expression
(Indx
))
4974 -- Start of processing for Safe_Left_Hand_Side
4977 if Is_Entity_Name
(N
) then
4980 elsif Nkind_In
(N
, N_Explicit_Dereference
, N_Selected_Component
)
4981 and then Safe_Left_Hand_Side
(Prefix
(N
))
4985 elsif Nkind
(N
) = N_Indexed_Component
4986 and then Safe_Left_Hand_Side
(Prefix
(N
))
4988 Is_Safe_Index
(First
(Expressions
(N
)))
4992 elsif Nkind
(N
) = N_Unchecked_Type_Conversion
then
4993 return Safe_Left_Hand_Side
(Expression
(N
));
4998 end Safe_Left_Hand_Side
;
5003 -- Holds the temporary aggregate value
5006 -- Holds the declaration of Tmp
5008 Aggr_Code
: List_Id
;
5009 Parent_Node
: Node_Id
;
5010 Parent_Kind
: Node_Kind
;
5012 -- Start of processing for Expand_Array_Aggregate
5015 -- Do not touch the special aggregates of attributes used for Asm calls
5017 if Is_RTE
(Ctyp
, RE_Asm_Input_Operand
)
5018 or else Is_RTE
(Ctyp
, RE_Asm_Output_Operand
)
5023 -- If the semantic analyzer has determined that aggregate N will raise
5024 -- Constraint_Error at run time, then the aggregate node has been
5025 -- replaced with an N_Raise_Constraint_Error node and we should
5028 pragma Assert
(not Raises_Constraint_Error
(N
));
5032 -- Check that the index range defined by aggregate bounds is
5033 -- compatible with corresponding index subtype.
5035 Index_Compatibility_Check
: declare
5036 Aggr_Index_Range
: Node_Id
:= First_Index
(Typ
);
5037 -- The current aggregate index range
5039 Index_Constraint
: Node_Id
:= First_Index
(Etype
(Typ
));
5040 -- The corresponding index constraint against which we have to
5041 -- check the above aggregate index range.
5044 Compute_Others_Present
(N
, 1);
5046 for J
in 1 .. Aggr_Dimension
loop
5047 -- There is no need to emit a check if an others choice is
5048 -- present for this array aggregate dimension since in this
5049 -- case one of N's sub-aggregates has taken its bounds from the
5050 -- context and these bounds must have been checked already. In
5051 -- addition all sub-aggregates corresponding to the same
5052 -- dimension must all have the same bounds (checked in (c) below).
5054 if not Range_Checks_Suppressed
(Etype
(Index_Constraint
))
5055 and then not Others_Present
(J
)
5057 -- We don't use Checks.Apply_Range_Check here because it emits
5058 -- a spurious check. Namely it checks that the range defined by
5059 -- the aggregate bounds is non empty. But we know this already
5062 Check_Bounds
(Aggr_Index_Range
, Index_Constraint
);
5065 -- Save the low and high bounds of the aggregate index as well as
5066 -- the index type for later use in checks (b) and (c) below.
5068 Aggr_Low
(J
) := Low_Bound
(Aggr_Index_Range
);
5069 Aggr_High
(J
) := High_Bound
(Aggr_Index_Range
);
5071 Aggr_Index_Typ
(J
) := Etype
(Index_Constraint
);
5073 Next_Index
(Aggr_Index_Range
);
5074 Next_Index
(Index_Constraint
);
5076 end Index_Compatibility_Check
;
5080 -- If an others choice is present check that no aggregate index is
5081 -- outside the bounds of the index constraint.
5083 Others_Check
(N
, 1);
5087 -- For multidimensional arrays make sure that all subaggregates
5088 -- corresponding to the same dimension have the same bounds.
5090 if Aggr_Dimension
> 1 then
5091 Check_Same_Aggr_Bounds
(N
, 1);
5096 -- Here we test for is packed array aggregate that we can handle at
5097 -- compile time. If so, return with transformation done. Note that we do
5098 -- this even if the aggregate is nested, because once we have done this
5099 -- processing, there is no more nested aggregate!
5101 if Packed_Array_Aggregate_Handled
(N
) then
5105 -- At this point we try to convert to positional form
5107 if Ekind
(Current_Scope
) = E_Package
5108 and then Static_Elaboration_Desired
(Current_Scope
)
5110 Convert_To_Positional
(N
, Max_Others_Replicate
=> 100);
5113 Convert_To_Positional
(N
);
5116 -- if the result is no longer an aggregate (e.g. it may be a string
5117 -- literal, or a temporary which has the needed value), then we are
5118 -- done, since there is no longer a nested aggregate.
5120 if Nkind
(N
) /= N_Aggregate
then
5123 -- We are also done if the result is an analyzed aggregate
5124 -- This case could use more comments ???
5127 and then N
/= Original_Node
(N
)
5132 -- If all aggregate components are compile-time known and the aggregate
5133 -- has been flattened, nothing left to do. The same occurs if the
5134 -- aggregate is used to initialize the components of an statically
5135 -- allocated dispatch table.
5137 if Compile_Time_Known_Aggregate
(N
)
5138 or else Is_Static_Dispatch_Table_Aggregate
(N
)
5140 Set_Expansion_Delayed
(N
, False);
5144 -- Now see if back end processing is possible
5146 if Backend_Processing_Possible
(N
) then
5148 -- If the aggregate is static but the constraints are not, build
5149 -- a static subtype for the aggregate, so that Gigi can place it
5150 -- in static memory. Perform an unchecked_conversion to the non-
5151 -- static type imposed by the context.
5154 Itype
: constant Entity_Id
:= Etype
(N
);
5156 Needs_Type
: Boolean := False;
5159 Index
:= First_Index
(Itype
);
5160 while Present
(Index
) loop
5161 if not Is_Static_Subtype
(Etype
(Index
)) then
5170 Build_Constrained_Type
(Positional
=> True);
5171 Rewrite
(N
, Unchecked_Convert_To
(Itype
, N
));
5181 -- Delay expansion for nested aggregates: it will be taken care of
5182 -- when the parent aggregate is expanded.
5184 Parent_Node
:= Parent
(N
);
5185 Parent_Kind
:= Nkind
(Parent_Node
);
5187 if Parent_Kind
= N_Qualified_Expression
then
5188 Parent_Node
:= Parent
(Parent_Node
);
5189 Parent_Kind
:= Nkind
(Parent_Node
);
5192 if Parent_Kind
= N_Aggregate
5193 or else Parent_Kind
= N_Extension_Aggregate
5194 or else Parent_Kind
= N_Component_Association
5195 or else (Parent_Kind
= N_Object_Declaration
5196 and then Needs_Finalization
(Typ
))
5197 or else (Parent_Kind
= N_Assignment_Statement
5198 and then Inside_Init_Proc
)
5200 if Static_Array_Aggregate
(N
)
5201 or else Compile_Time_Known_Aggregate
(N
)
5203 Set_Expansion_Delayed
(N
, False);
5206 Set_Expansion_Delayed
(N
);
5213 -- Look if in place aggregate expansion is possible
5215 -- For object declarations we build the aggregate in place, unless
5216 -- the array is bit-packed or the component is controlled.
5218 -- For assignments we do the assignment in place if all the component
5219 -- associations have compile-time known values. For other cases we
5220 -- create a temporary. The analysis for safety of on-line assignment
5221 -- is delicate, i.e. we don't know how to do it fully yet ???
5223 -- For allocators we assign to the designated object in place if the
5224 -- aggregate meets the same conditions as other in-place assignments.
5225 -- In this case the aggregate may not come from source but was created
5226 -- for default initialization, e.g. with Initialize_Scalars.
5228 if Requires_Transient_Scope
(Typ
) then
5229 Establish_Transient_Scope
5230 (N
, Sec_Stack
=> Has_Controlled_Component
(Typ
));
5233 if Has_Default_Init_Comps
(N
) then
5234 Maybe_In_Place_OK
:= False;
5236 elsif Is_Bit_Packed_Array
(Typ
)
5237 or else Has_Controlled_Component
(Typ
)
5239 Maybe_In_Place_OK
:= False;
5242 Maybe_In_Place_OK
:=
5243 (Nkind
(Parent
(N
)) = N_Assignment_Statement
5244 and then Comes_From_Source
(N
)
5245 and then In_Place_Assign_OK
)
5248 (Nkind
(Parent
(Parent
(N
))) = N_Allocator
5249 and then In_Place_Assign_OK
);
5252 -- If this is an array of tasks, it will be expanded into build-in-place
5253 -- assignments. Build an activation chain for the tasks now.
5255 if Has_Task
(Etype
(N
)) then
5256 Build_Activation_Chain_Entity
(N
);
5259 -- Should document these individual tests ???
5261 if not Has_Default_Init_Comps
(N
)
5262 and then Comes_From_Source
(Parent
(N
))
5263 and then Nkind
(Parent
(N
)) = N_Object_Declaration
5265 Must_Slide
(Etype
(Defining_Identifier
(Parent
(N
))), Typ
)
5266 and then N
= Expression
(Parent
(N
))
5267 and then not Is_Bit_Packed_Array
(Typ
)
5268 and then not Has_Controlled_Component
(Typ
)
5270 -- If the aggregate is the expression in an object declaration, it
5271 -- cannot be expanded in place. Lookahead in the current declarative
5272 -- part to find an address clause for the object being declared. If
5273 -- one is present, we cannot build in place. Unclear comment???
5275 and then not Has_Following_Address_Clause
(Parent
(N
))
5277 Tmp
:= Defining_Identifier
(Parent
(N
));
5278 Set_No_Initialization
(Parent
(N
));
5279 Set_Expression
(Parent
(N
), Empty
);
5281 -- Set the type of the entity, for use in the analysis of the
5282 -- subsequent indexed assignments. If the nominal type is not
5283 -- constrained, build a subtype from the known bounds of the
5284 -- aggregate. If the declaration has a subtype mark, use it,
5285 -- otherwise use the itype of the aggregate.
5287 if not Is_Constrained
(Typ
) then
5288 Build_Constrained_Type
(Positional
=> False);
5289 elsif Is_Entity_Name
(Object_Definition
(Parent
(N
)))
5290 and then Is_Constrained
(Entity
(Object_Definition
(Parent
(N
))))
5292 Set_Etype
(Tmp
, Entity
(Object_Definition
(Parent
(N
))));
5294 Set_Size_Known_At_Compile_Time
(Typ
, False);
5295 Set_Etype
(Tmp
, Typ
);
5298 elsif Maybe_In_Place_OK
5299 and then Nkind
(Parent
(N
)) = N_Qualified_Expression
5300 and then Nkind
(Parent
(Parent
(N
))) = N_Allocator
5302 Set_Expansion_Delayed
(N
);
5305 -- In the remaining cases the aggregate is the RHS of an assignment
5307 elsif Maybe_In_Place_OK
5308 and then Safe_Left_Hand_Side
(Name
(Parent
(N
)))
5310 Tmp
:= Name
(Parent
(N
));
5312 if Etype
(Tmp
) /= Etype
(N
) then
5313 Apply_Length_Check
(N
, Etype
(Tmp
));
5315 if Nkind
(N
) = N_Raise_Constraint_Error
then
5317 -- Static error, nothing further to expand
5323 elsif Maybe_In_Place_OK
5324 and then Nkind
(Name
(Parent
(N
))) = N_Slice
5325 and then Safe_Slice_Assignment
(N
)
5327 -- Safe_Slice_Assignment rewrites assignment as a loop
5333 -- In place aggregate expansion is not possible
5336 Maybe_In_Place_OK
:= False;
5337 Tmp
:= Make_Temporary
(Loc
, 'A', N
);
5339 Make_Object_Declaration
5341 Defining_Identifier
=> Tmp
,
5342 Object_Definition
=> New_Occurrence_Of
(Typ
, Loc
));
5343 Set_No_Initialization
(Tmp_Decl
, True);
5345 -- If we are within a loop, the temporary will be pushed on the
5346 -- stack at each iteration. If the aggregate is the expression for an
5347 -- allocator, it will be immediately copied to the heap and can
5348 -- be reclaimed at once. We create a transient scope around the
5349 -- aggregate for this purpose.
5351 if Ekind
(Current_Scope
) = E_Loop
5352 and then Nkind
(Parent
(Parent
(N
))) = N_Allocator
5354 Establish_Transient_Scope
(N
, False);
5357 Insert_Action
(N
, Tmp_Decl
);
5360 -- Construct and insert the aggregate code. We can safely suppress index
5361 -- checks because this code is guaranteed not to raise CE on index
5362 -- checks. However we should *not* suppress all checks.
5368 if Nkind
(Tmp
) = N_Defining_Identifier
then
5369 Target
:= New_Reference_To
(Tmp
, Loc
);
5373 if Has_Default_Init_Comps
(N
) then
5375 -- Ada 2005 (AI-287): This case has not been analyzed???
5377 raise Program_Error
;
5380 -- Name in assignment is explicit dereference
5382 Target
:= New_Copy
(Tmp
);
5386 Build_Array_Aggr_Code
(N
,
5388 Index
=> First_Index
(Typ
),
5390 Scalar_Comp
=> Is_Scalar_Type
(Ctyp
));
5393 if Comes_From_Source
(Tmp
) then
5394 Insert_Actions_After
(Parent
(N
), Aggr_Code
);
5397 Insert_Actions
(N
, Aggr_Code
);
5400 -- If the aggregate has been assigned in place, remove the original
5403 if Nkind
(Parent
(N
)) = N_Assignment_Statement
5404 and then Maybe_In_Place_OK
5406 Rewrite
(Parent
(N
), Make_Null_Statement
(Loc
));
5408 elsif Nkind
(Parent
(N
)) /= N_Object_Declaration
5409 or else Tmp
/= Defining_Identifier
(Parent
(N
))
5411 Rewrite
(N
, New_Occurrence_Of
(Tmp
, Loc
));
5412 Analyze_And_Resolve
(N
, Typ
);
5414 end Expand_Array_Aggregate
;
5416 ------------------------
5417 -- Expand_N_Aggregate --
5418 ------------------------
5420 procedure Expand_N_Aggregate
(N
: Node_Id
) is
5422 if Is_Record_Type
(Etype
(N
)) then
5423 Expand_Record_Aggregate
(N
);
5425 Expand_Array_Aggregate
(N
);
5428 when RE_Not_Available
=>
5430 end Expand_N_Aggregate
;
5432 ----------------------------------
5433 -- Expand_N_Extension_Aggregate --
5434 ----------------------------------
5436 -- If the ancestor part is an expression, add a component association for
5437 -- the parent field. If the type of the ancestor part is not the direct
5438 -- parent of the expected type, build recursively the needed ancestors.
5439 -- If the ancestor part is a subtype_mark, replace aggregate with a decla-
5440 -- ration for a temporary of the expected type, followed by individual
5441 -- assignments to the given components.
5443 procedure Expand_N_Extension_Aggregate
(N
: Node_Id
) is
5444 Loc
: constant Source_Ptr
:= Sloc
(N
);
5445 A
: constant Node_Id
:= Ancestor_Part
(N
);
5446 Typ
: constant Entity_Id
:= Etype
(N
);
5449 -- If the ancestor is a subtype mark, an init proc must be called
5450 -- on the resulting object which thus has to be materialized in
5453 if Is_Entity_Name
(A
) and then Is_Type
(Entity
(A
)) then
5454 Convert_To_Assignments
(N
, Typ
);
5456 -- The extension aggregate is transformed into a record aggregate
5457 -- of the following form (c1 and c2 are inherited components)
5459 -- (Exp with c3 => a, c4 => b)
5460 -- ==> (c1 => Exp.c1, c2 => Exp.c2, c3 => a, c4 => b)
5465 if Tagged_Type_Expansion
then
5466 Expand_Record_Aggregate
(N
,
5469 (Node
(First_Elmt
(Access_Disp_Table
(Typ
))), Loc
),
5472 -- No tag is needed in the case of a VM
5473 Expand_Record_Aggregate
(N
,
5479 when RE_Not_Available
=>
5481 end Expand_N_Extension_Aggregate
;
5483 -----------------------------
5484 -- Expand_Record_Aggregate --
5485 -----------------------------
5487 procedure Expand_Record_Aggregate
5489 Orig_Tag
: Node_Id
:= Empty
;
5490 Parent_Expr
: Node_Id
:= Empty
)
5492 Loc
: constant Source_Ptr
:= Sloc
(N
);
5493 Comps
: constant List_Id
:= Component_Associations
(N
);
5494 Typ
: constant Entity_Id
:= Etype
(N
);
5495 Base_Typ
: constant Entity_Id
:= Base_Type
(Typ
);
5497 Static_Components
: Boolean := True;
5498 -- Flag to indicate whether all components are compile-time known,
5499 -- and the aggregate can be constructed statically and handled by
5502 function Component_Not_OK_For_Backend
return Boolean;
5503 -- Check for presence of component which makes it impossible for the
5504 -- backend to process the aggregate, thus requiring the use of a series
5505 -- of assignment statements. Cases checked for are a nested aggregate
5506 -- needing Late_Expansion, the presence of a tagged component which may
5507 -- need tag adjustment, and a bit unaligned component reference.
5509 -- We also force expansion into assignments if a component is of a
5510 -- mutable type (including a private type with discriminants) because
5511 -- in that case the size of the component to be copied may be smaller
5512 -- than the side of the target, and there is no simple way for gigi
5513 -- to compute the size of the object to be copied.
5515 -- NOTE: This is part of the ongoing work to define precisely the
5516 -- interface between front-end and back-end handling of aggregates.
5517 -- In general it is desirable to pass aggregates as they are to gigi,
5518 -- in order to minimize elaboration code. This is one case where the
5519 -- semantics of Ada complicate the analysis and lead to anomalies in
5520 -- the gcc back-end if the aggregate is not expanded into assignments.
5522 ----------------------------------
5523 -- Component_Not_OK_For_Backend --
5524 ----------------------------------
5526 function Component_Not_OK_For_Backend
return Boolean is
5536 while Present
(C
) loop
5538 -- If the component has box initialization, expansion is needed
5539 -- and component is not ready for backend.
5541 if Box_Present
(C
) then
5545 if Nkind
(Expression
(C
)) = N_Qualified_Expression
then
5546 Expr_Q
:= Expression
(Expression
(C
));
5548 Expr_Q
:= Expression
(C
);
5551 -- Return true if the aggregate has any associations for tagged
5552 -- components that may require tag adjustment.
5554 -- These are cases where the source expression may have a tag that
5555 -- could differ from the component tag (e.g., can occur for type
5556 -- conversions and formal parameters). (Tag adjustment not needed
5557 -- if VM_Target because object tags are implicit in the machine.)
5559 if Is_Tagged_Type
(Etype
(Expr_Q
))
5560 and then (Nkind
(Expr_Q
) = N_Type_Conversion
5561 or else (Is_Entity_Name
(Expr_Q
)
5563 Ekind
(Entity
(Expr_Q
)) in Formal_Kind
))
5564 and then Tagged_Type_Expansion
5566 Static_Components
:= False;
5569 elsif Is_Delayed_Aggregate
(Expr_Q
) then
5570 Static_Components
:= False;
5573 elsif Possible_Bit_Aligned_Component
(Expr_Q
) then
5574 Static_Components
:= False;
5578 if Is_Scalar_Type
(Etype
(Expr_Q
)) then
5579 if not Compile_Time_Known_Value
(Expr_Q
) then
5580 Static_Components
:= False;
5583 elsif Nkind
(Expr_Q
) /= N_Aggregate
5584 or else not Compile_Time_Known_Aggregate
(Expr_Q
)
5586 Static_Components
:= False;
5588 if Is_Private_Type
(Etype
(Expr_Q
))
5589 and then Has_Discriminants
(Etype
(Expr_Q
))
5599 end Component_Not_OK_For_Backend
;
5601 -- Remaining Expand_Record_Aggregate variables
5603 Tag_Value
: Node_Id
;
5607 -- Start of processing for Expand_Record_Aggregate
5610 -- If the aggregate is to be assigned to an atomic variable, we
5611 -- have to prevent a piecemeal assignment even if the aggregate
5612 -- is to be expanded. We create a temporary for the aggregate, and
5613 -- assign the temporary instead, so that the back end can generate
5614 -- an atomic move for it.
5617 and then Comes_From_Source
(Parent
(N
))
5618 and then Is_Atomic_Aggregate
(N
, Typ
)
5622 -- No special management required for aggregates used to initialize
5623 -- statically allocated dispatch tables
5625 elsif Is_Static_Dispatch_Table_Aggregate
(N
) then
5629 -- Ada 2005 (AI-318-2): We need to convert to assignments if components
5630 -- are build-in-place function calls. The assignments will each turn
5631 -- into a build-in-place function call. If components are all static,
5632 -- we can pass the aggregate to the backend regardless of limitedness.
5634 -- Extension aggregates, aggregates in extended return statements, and
5635 -- aggregates for C++ imported types must be expanded.
5637 if Ada_Version
>= Ada_2005
and then Is_Immutably_Limited_Type
(Typ
) then
5638 if not Nkind_In
(Parent
(N
), N_Object_Declaration
,
5639 N_Component_Association
)
5641 Convert_To_Assignments
(N
, Typ
);
5643 elsif Nkind
(N
) = N_Extension_Aggregate
5644 or else Convention
(Typ
) = Convention_CPP
5646 Convert_To_Assignments
(N
, Typ
);
5648 elsif not Size_Known_At_Compile_Time
(Typ
)
5649 or else Component_Not_OK_For_Backend
5650 or else not Static_Components
5652 Convert_To_Assignments
(N
, Typ
);
5655 Set_Compile_Time_Known_Aggregate
(N
);
5656 Set_Expansion_Delayed
(N
, False);
5659 -- Gigi doesn't handle properly temporaries of variable size
5660 -- so we generate it in the front-end
5662 elsif not Size_Known_At_Compile_Time
(Typ
) then
5663 Convert_To_Assignments
(N
, Typ
);
5665 -- Temporaries for controlled aggregates need to be attached to a
5666 -- final chain in order to be properly finalized, so it has to
5667 -- be created in the front-end
5669 elsif Is_Controlled
(Typ
)
5670 or else Has_Controlled_Component
(Base_Type
(Typ
))
5672 Convert_To_Assignments
(N
, Typ
);
5674 -- Ada 2005 (AI-287): In case of default initialized components we
5675 -- convert the aggregate into assignments.
5677 elsif Has_Default_Init_Comps
(N
) then
5678 Convert_To_Assignments
(N
, Typ
);
5682 elsif Component_Not_OK_For_Backend
then
5683 Convert_To_Assignments
(N
, Typ
);
5685 -- If an ancestor is private, some components are not inherited and
5686 -- we cannot expand into a record aggregate
5688 elsif Has_Private_Ancestor
(Typ
) then
5689 Convert_To_Assignments
(N
, Typ
);
5691 -- ??? The following was done to compile fxacc00.ads in the ACVCs. Gigi
5692 -- is not able to handle the aggregate for Late_Request.
5694 elsif Is_Tagged_Type
(Typ
) and then Has_Discriminants
(Typ
) then
5695 Convert_To_Assignments
(N
, Typ
);
5697 -- If the tagged types covers interface types we need to initialize all
5698 -- hidden components containing pointers to secondary dispatch tables.
5700 elsif Is_Tagged_Type
(Typ
) and then Has_Interfaces
(Typ
) then
5701 Convert_To_Assignments
(N
, Typ
);
5703 -- If some components are mutable, the size of the aggregate component
5704 -- may be distinct from the default size of the type component, so
5705 -- we need to expand to insure that the back-end copies the proper
5706 -- size of the data.
5708 elsif Has_Mutable_Components
(Typ
) then
5709 Convert_To_Assignments
(N
, Typ
);
5711 -- If the type involved has any non-bit aligned components, then we are
5712 -- not sure that the back end can handle this case correctly.
5714 elsif Type_May_Have_Bit_Aligned_Components
(Typ
) then
5715 Convert_To_Assignments
(N
, Typ
);
5717 -- In all other cases, build a proper aggregate handlable by gigi
5720 if Nkind
(N
) = N_Aggregate
then
5722 -- If the aggregate is static and can be handled by the back-end,
5723 -- nothing left to do.
5725 if Static_Components
then
5726 Set_Compile_Time_Known_Aggregate
(N
);
5727 Set_Expansion_Delayed
(N
, False);
5731 -- If no discriminants, nothing special to do
5733 if not Has_Discriminants
(Typ
) then
5736 -- Case of discriminants present
5738 elsif Is_Derived_Type
(Typ
) then
5740 -- For untagged types, non-stored discriminants are replaced
5741 -- with stored discriminants, which are the ones that gigi uses
5742 -- to describe the type and its components.
5744 Generate_Aggregate_For_Derived_Type
: declare
5745 Constraints
: constant List_Id
:= New_List
;
5746 First_Comp
: Node_Id
;
5747 Discriminant
: Entity_Id
;
5749 Num_Disc
: Int
:= 0;
5750 Num_Gird
: Int
:= 0;
5752 procedure Prepend_Stored_Values
(T
: Entity_Id
);
5753 -- Scan the list of stored discriminants of the type, and add
5754 -- their values to the aggregate being built.
5756 ---------------------------
5757 -- Prepend_Stored_Values --
5758 ---------------------------
5760 procedure Prepend_Stored_Values
(T
: Entity_Id
) is
5762 Discriminant
:= First_Stored_Discriminant
(T
);
5763 while Present
(Discriminant
) loop
5765 Make_Component_Association
(Loc
,
5767 New_List
(New_Occurrence_Of
(Discriminant
, Loc
)),
5771 Get_Discriminant_Value
(
5774 Discriminant_Constraint
(Typ
))));
5776 if No
(First_Comp
) then
5777 Prepend_To
(Component_Associations
(N
), New_Comp
);
5779 Insert_After
(First_Comp
, New_Comp
);
5782 First_Comp
:= New_Comp
;
5783 Next_Stored_Discriminant
(Discriminant
);
5785 end Prepend_Stored_Values
;
5787 -- Start of processing for Generate_Aggregate_For_Derived_Type
5790 -- Remove the associations for the discriminant of derived type
5792 First_Comp
:= First
(Component_Associations
(N
));
5793 while Present
(First_Comp
) loop
5798 (First
(Choices
(Comp
)))) = E_Discriminant
5801 Num_Disc
:= Num_Disc
+ 1;
5805 -- Insert stored discriminant associations in the correct
5806 -- order. If there are more stored discriminants than new
5807 -- discriminants, there is at least one new discriminant that
5808 -- constrains more than one of the stored discriminants. In
5809 -- this case we need to construct a proper subtype of the
5810 -- parent type, in order to supply values to all the
5811 -- components. Otherwise there is one-one correspondence
5812 -- between the constraints and the stored discriminants.
5814 First_Comp
:= Empty
;
5816 Discriminant
:= First_Stored_Discriminant
(Base_Type
(Typ
));
5817 while Present
(Discriminant
) loop
5818 Num_Gird
:= Num_Gird
+ 1;
5819 Next_Stored_Discriminant
(Discriminant
);
5822 -- Case of more stored discriminants than new discriminants
5824 if Num_Gird
> Num_Disc
then
5826 -- Create a proper subtype of the parent type, which is the
5827 -- proper implementation type for the aggregate, and convert
5828 -- it to the intended target type.
5830 Discriminant
:= First_Stored_Discriminant
(Base_Type
(Typ
));
5831 while Present
(Discriminant
) loop
5834 Get_Discriminant_Value
(
5837 Discriminant_Constraint
(Typ
)));
5838 Append
(New_Comp
, Constraints
);
5839 Next_Stored_Discriminant
(Discriminant
);
5843 Make_Subtype_Declaration
(Loc
,
5844 Defining_Identifier
=> Make_Temporary
(Loc
, 'T'),
5845 Subtype_Indication
=>
5846 Make_Subtype_Indication
(Loc
,
5848 New_Occurrence_Of
(Etype
(Base_Type
(Typ
)), Loc
),
5850 Make_Index_Or_Discriminant_Constraint
5851 (Loc
, Constraints
)));
5853 Insert_Action
(N
, Decl
);
5854 Prepend_Stored_Values
(Base_Type
(Typ
));
5856 Set_Etype
(N
, Defining_Identifier
(Decl
));
5859 Rewrite
(N
, Unchecked_Convert_To
(Typ
, N
));
5862 -- Case where we do not have fewer new discriminants than
5863 -- stored discriminants, so in this case we can simply use the
5864 -- stored discriminants of the subtype.
5867 Prepend_Stored_Values
(Typ
);
5869 end Generate_Aggregate_For_Derived_Type
;
5872 if Is_Tagged_Type
(Typ
) then
5874 -- The tagged case, _parent and _tag component must be created
5876 -- Reset null_present unconditionally. tagged records always have
5877 -- at least one field (the tag or the parent)
5879 Set_Null_Record_Present
(N
, False);
5881 -- When the current aggregate comes from the expansion of an
5882 -- extension aggregate, the parent expr is replaced by an
5883 -- aggregate formed by selected components of this expr
5885 if Present
(Parent_Expr
)
5886 and then Is_Empty_List
(Comps
)
5888 Comp
:= First_Component_Or_Discriminant
(Typ
);
5889 while Present
(Comp
) loop
5891 -- Skip all expander-generated components
5894 not Comes_From_Source
(Original_Record_Component
(Comp
))
5900 Make_Selected_Component
(Loc
,
5902 Unchecked_Convert_To
(Typ
,
5903 Duplicate_Subexpr
(Parent_Expr
, True)),
5905 Selector_Name
=> New_Occurrence_Of
(Comp
, Loc
));
5908 Make_Component_Association
(Loc
,
5910 New_List
(New_Occurrence_Of
(Comp
, Loc
)),
5914 Analyze_And_Resolve
(New_Comp
, Etype
(Comp
));
5917 Next_Component_Or_Discriminant
(Comp
);
5921 -- Compute the value for the Tag now, if the type is a root it
5922 -- will be included in the aggregate right away, otherwise it will
5923 -- be propagated to the parent aggregate
5925 if Present
(Orig_Tag
) then
5926 Tag_Value
:= Orig_Tag
;
5927 elsif not Tagged_Type_Expansion
then
5932 (Node
(First_Elmt
(Access_Disp_Table
(Typ
))), Loc
);
5935 -- For a derived type, an aggregate for the parent is formed with
5936 -- all the inherited components.
5938 if Is_Derived_Type
(Typ
) then
5941 First_Comp
: Node_Id
;
5942 Parent_Comps
: List_Id
;
5943 Parent_Aggr
: Node_Id
;
5944 Parent_Name
: Node_Id
;
5947 -- Remove the inherited component association from the
5948 -- aggregate and store them in the parent aggregate
5950 First_Comp
:= First
(Component_Associations
(N
));
5951 Parent_Comps
:= New_List
;
5952 while Present
(First_Comp
)
5953 and then Scope
(Original_Record_Component
(
5954 Entity
(First
(Choices
(First_Comp
))))) /= Base_Typ
5959 Append
(Comp
, Parent_Comps
);
5962 Parent_Aggr
:= Make_Aggregate
(Loc
,
5963 Component_Associations
=> Parent_Comps
);
5964 Set_Etype
(Parent_Aggr
, Etype
(Base_Type
(Typ
)));
5966 -- Find the _parent component
5968 Comp
:= First_Component
(Typ
);
5969 while Chars
(Comp
) /= Name_uParent
loop
5970 Comp
:= Next_Component
(Comp
);
5973 Parent_Name
:= New_Occurrence_Of
(Comp
, Loc
);
5975 -- Insert the parent aggregate
5977 Prepend_To
(Component_Associations
(N
),
5978 Make_Component_Association
(Loc
,
5979 Choices
=> New_List
(Parent_Name
),
5980 Expression
=> Parent_Aggr
));
5982 -- Expand recursively the parent propagating the right Tag
5984 Expand_Record_Aggregate
(
5985 Parent_Aggr
, Tag_Value
, Parent_Expr
);
5988 -- For a root type, the tag component is added (unless compiling
5989 -- for the VMs, where tags are implicit).
5991 elsif Tagged_Type_Expansion
then
5993 Tag_Name
: constant Node_Id
:=
5995 (First_Tag_Component
(Typ
), Loc
);
5996 Typ_Tag
: constant Entity_Id
:= RTE
(RE_Tag
);
5997 Conv_Node
: constant Node_Id
:=
5998 Unchecked_Convert_To
(Typ_Tag
, Tag_Value
);
6001 Set_Etype
(Conv_Node
, Typ_Tag
);
6002 Prepend_To
(Component_Associations
(N
),
6003 Make_Component_Association
(Loc
,
6004 Choices
=> New_List
(Tag_Name
),
6005 Expression
=> Conv_Node
));
6011 end Expand_Record_Aggregate
;
6013 ----------------------------
6014 -- Has_Default_Init_Comps --
6015 ----------------------------
6017 function Has_Default_Init_Comps
(N
: Node_Id
) return Boolean is
6018 Comps
: constant List_Id
:= Component_Associations
(N
);
6022 pragma Assert
(Nkind_In
(N
, N_Aggregate
, N_Extension_Aggregate
));
6028 if Has_Self_Reference
(N
) then
6032 -- Check if any direct component has default initialized components
6035 while Present
(C
) loop
6036 if Box_Present
(C
) then
6043 -- Recursive call in case of aggregate expression
6046 while Present
(C
) loop
6047 Expr
:= Expression
(C
);
6051 Nkind_In
(Expr
, N_Aggregate
, N_Extension_Aggregate
)
6052 and then Has_Default_Init_Comps
(Expr
)
6061 end Has_Default_Init_Comps
;
6063 --------------------------
6064 -- Is_Delayed_Aggregate --
6065 --------------------------
6067 function Is_Delayed_Aggregate
(N
: Node_Id
) return Boolean is
6068 Node
: Node_Id
:= N
;
6069 Kind
: Node_Kind
:= Nkind
(Node
);
6072 if Kind
= N_Qualified_Expression
then
6073 Node
:= Expression
(Node
);
6074 Kind
:= Nkind
(Node
);
6077 if Kind
/= N_Aggregate
and then Kind
/= N_Extension_Aggregate
then
6080 return Expansion_Delayed
(Node
);
6082 end Is_Delayed_Aggregate
;
6084 ----------------------------------------
6085 -- Is_Static_Dispatch_Table_Aggregate --
6086 ----------------------------------------
6088 function Is_Static_Dispatch_Table_Aggregate
(N
: Node_Id
) return Boolean is
6089 Typ
: constant Entity_Id
:= Base_Type
(Etype
(N
));
6092 return Static_Dispatch_Tables
6093 and then Tagged_Type_Expansion
6094 and then RTU_Loaded
(Ada_Tags
)
6096 -- Avoid circularity when rebuilding the compiler
6098 and then Cunit_Entity
(Get_Source_Unit
(N
)) /= RTU_Entity
(Ada_Tags
)
6099 and then (Typ
= RTE
(RE_Dispatch_Table_Wrapper
)
6101 Typ
= RTE
(RE_Address_Array
)
6103 Typ
= RTE
(RE_Type_Specific_Data
)
6105 Typ
= RTE
(RE_Tag_Table
)
6107 (RTE_Available
(RE_Interface_Data
)
6108 and then Typ
= RTE
(RE_Interface_Data
))
6110 (RTE_Available
(RE_Interfaces_Array
)
6111 and then Typ
= RTE
(RE_Interfaces_Array
))
6113 (RTE_Available
(RE_Interface_Data_Element
)
6114 and then Typ
= RTE
(RE_Interface_Data_Element
)));
6115 end Is_Static_Dispatch_Table_Aggregate
;
6117 --------------------
6118 -- Late_Expansion --
6119 --------------------
6121 function Late_Expansion
6125 Flist
: Node_Id
:= Empty
;
6126 Obj
: Entity_Id
:= Empty
) return List_Id
6129 if Is_Record_Type
(Etype
(N
)) then
6130 return Build_Record_Aggr_Code
(N
, Typ
, Target
, Flist
, Obj
);
6132 else pragma Assert
(Is_Array_Type
(Etype
(N
)));
6134 Build_Array_Aggr_Code
6136 Ctype
=> Component_Type
(Etype
(N
)),
6137 Index
=> First_Index
(Typ
),
6139 Scalar_Comp
=> Is_Scalar_Type
(Component_Type
(Typ
)),
6145 ----------------------------------
6146 -- Make_OK_Assignment_Statement --
6147 ----------------------------------
6149 function Make_OK_Assignment_Statement
6152 Expression
: Node_Id
) return Node_Id
6155 Set_Assignment_OK
(Name
);
6157 return Make_Assignment_Statement
(Sloc
, Name
, Expression
);
6158 end Make_OK_Assignment_Statement
;
6160 -----------------------
6161 -- Number_Of_Choices --
6162 -----------------------
6164 function Number_Of_Choices
(N
: Node_Id
) return Nat
is
6168 Nb_Choices
: Nat
:= 0;
6171 if Present
(Expressions
(N
)) then
6175 Assoc
:= First
(Component_Associations
(N
));
6176 while Present
(Assoc
) loop
6177 Choice
:= First
(Choices
(Assoc
));
6178 while Present
(Choice
) loop
6179 if Nkind
(Choice
) /= N_Others_Choice
then
6180 Nb_Choices
:= Nb_Choices
+ 1;
6190 end Number_Of_Choices
;
6192 ------------------------------------
6193 -- Packed_Array_Aggregate_Handled --
6194 ------------------------------------
6196 -- The current version of this procedure will handle at compile time
6197 -- any array aggregate that meets these conditions:
6199 -- One dimensional, bit packed
6200 -- Underlying packed type is modular type
6201 -- Bounds are within 32-bit Int range
6202 -- All bounds and values are static
6204 function Packed_Array_Aggregate_Handled
(N
: Node_Id
) return Boolean is
6205 Loc
: constant Source_Ptr
:= Sloc
(N
);
6206 Typ
: constant Entity_Id
:= Etype
(N
);
6207 Ctyp
: constant Entity_Id
:= Component_Type
(Typ
);
6209 Not_Handled
: exception;
6210 -- Exception raised if this aggregate cannot be handled
6213 -- For now, handle only one dimensional bit packed arrays
6215 if not Is_Bit_Packed_Array
(Typ
)
6216 or else Number_Dimensions
(Typ
) > 1
6217 or else not Is_Modular_Integer_Type
(Packed_Array_Type
(Typ
))
6222 if not Is_Scalar_Type
(Component_Type
(Typ
))
6223 and then Has_Non_Standard_Rep
(Component_Type
(Typ
))
6229 Csiz
: constant Nat
:= UI_To_Int
(Component_Size
(Typ
));
6233 -- Bounds of index type
6237 -- Values of bounds if compile time known
6239 function Get_Component_Val
(N
: Node_Id
) return Uint
;
6240 -- Given a expression value N of the component type Ctyp, returns a
6241 -- value of Csiz (component size) bits representing this value. If
6242 -- the value is non-static or any other reason exists why the value
6243 -- cannot be returned, then Not_Handled is raised.
6245 -----------------------
6246 -- Get_Component_Val --
6247 -----------------------
6249 function Get_Component_Val
(N
: Node_Id
) return Uint
is
6253 -- We have to analyze the expression here before doing any further
6254 -- processing here. The analysis of such expressions is deferred
6255 -- till expansion to prevent some problems of premature analysis.
6257 Analyze_And_Resolve
(N
, Ctyp
);
6259 -- Must have a compile time value. String literals have to be
6260 -- converted into temporaries as well, because they cannot easily
6261 -- be converted into their bit representation.
6263 if not Compile_Time_Known_Value
(N
)
6264 or else Nkind
(N
) = N_String_Literal
6269 Val
:= Expr_Rep_Value
(N
);
6271 -- Adjust for bias, and strip proper number of bits
6273 if Has_Biased_Representation
(Ctyp
) then
6274 Val
:= Val
- Expr_Value
(Type_Low_Bound
(Ctyp
));
6277 return Val
mod Uint_2
** Csiz
;
6278 end Get_Component_Val
;
6280 -- Here we know we have a one dimensional bit packed array
6283 Get_Index_Bounds
(First_Index
(Typ
), Lo
, Hi
);
6285 -- Cannot do anything if bounds are dynamic
6287 if not Compile_Time_Known_Value
(Lo
)
6289 not Compile_Time_Known_Value
(Hi
)
6294 -- Or are silly out of range of int bounds
6296 Lob
:= Expr_Value
(Lo
);
6297 Hib
:= Expr_Value
(Hi
);
6299 if not UI_Is_In_Int_Range
(Lob
)
6301 not UI_Is_In_Int_Range
(Hib
)
6306 -- At this stage we have a suitable aggregate for handling at compile
6307 -- time (the only remaining checks are that the values of expressions
6308 -- in the aggregate are compile time known (check is performed by
6309 -- Get_Component_Val), and that any subtypes or ranges are statically
6312 -- If the aggregate is not fully positional at this stage, then
6313 -- convert it to positional form. Either this will fail, in which
6314 -- case we can do nothing, or it will succeed, in which case we have
6315 -- succeeded in handling the aggregate, or it will stay an aggregate,
6316 -- in which case we have failed to handle this case.
6318 if Present
(Component_Associations
(N
)) then
6319 Convert_To_Positional
6320 (N
, Max_Others_Replicate
=> 64, Handle_Bit_Packed
=> True);
6321 return Nkind
(N
) /= N_Aggregate
;
6324 -- Otherwise we are all positional, so convert to proper value
6327 Lov
: constant Int
:= UI_To_Int
(Lob
);
6328 Hiv
: constant Int
:= UI_To_Int
(Hib
);
6330 Len
: constant Nat
:= Int
'Max (0, Hiv
- Lov
+ 1);
6331 -- The length of the array (number of elements)
6333 Aggregate_Val
: Uint
;
6334 -- Value of aggregate. The value is set in the low order bits of
6335 -- this value. For the little-endian case, the values are stored
6336 -- from low-order to high-order and for the big-endian case the
6337 -- values are stored from high-order to low-order. Note that gigi
6338 -- will take care of the conversions to left justify the value in
6339 -- the big endian case (because of left justified modular type
6340 -- processing), so we do not have to worry about that here.
6343 -- Integer literal for resulting constructed value
6346 -- Shift count from low order for next value
6349 -- Shift increment for loop
6352 -- Next expression from positional parameters of aggregate
6355 -- For little endian, we fill up the low order bits of the target
6356 -- value. For big endian we fill up the high order bits of the
6357 -- target value (which is a left justified modular value).
6359 if Bytes_Big_Endian
xor Debug_Flag_8
then
6360 Shift
:= Csiz
* (Len
- 1);
6367 -- Loop to set the values
6370 Aggregate_Val
:= Uint_0
;
6372 Expr
:= First
(Expressions
(N
));
6373 Aggregate_Val
:= Get_Component_Val
(Expr
) * Uint_2
** Shift
;
6375 for J
in 2 .. Len
loop
6376 Shift
:= Shift
+ Incr
;
6379 Aggregate_Val
+ Get_Component_Val
(Expr
) * Uint_2
** Shift
;
6383 -- Now we can rewrite with the proper value
6386 Make_Integer_Literal
(Loc
,
6387 Intval
=> Aggregate_Val
);
6388 Set_Print_In_Hex
(Lit
);
6390 -- Construct the expression using this literal. Note that it is
6391 -- important to qualify the literal with its proper modular type
6392 -- since universal integer does not have the required range and
6393 -- also this is a left justified modular type, which is important
6394 -- in the big-endian case.
6397 Unchecked_Convert_To
(Typ
,
6398 Make_Qualified_Expression
(Loc
,
6400 New_Occurrence_Of
(Packed_Array_Type
(Typ
), Loc
),
6401 Expression
=> Lit
)));
6403 Analyze_And_Resolve
(N
, Typ
);
6411 end Packed_Array_Aggregate_Handled
;
6413 ----------------------------
6414 -- Has_Mutable_Components --
6415 ----------------------------
6417 function Has_Mutable_Components
(Typ
: Entity_Id
) return Boolean is
6421 Comp
:= First_Component
(Typ
);
6422 while Present
(Comp
) loop
6423 if Is_Record_Type
(Etype
(Comp
))
6424 and then Has_Discriminants
(Etype
(Comp
))
6425 and then not Is_Constrained
(Etype
(Comp
))
6430 Next_Component
(Comp
);
6434 end Has_Mutable_Components
;
6436 ------------------------------
6437 -- Initialize_Discriminants --
6438 ------------------------------
6440 procedure Initialize_Discriminants
(N
: Node_Id
; Typ
: Entity_Id
) is
6441 Loc
: constant Source_Ptr
:= Sloc
(N
);
6442 Bas
: constant Entity_Id
:= Base_Type
(Typ
);
6443 Par
: constant Entity_Id
:= Etype
(Bas
);
6444 Decl
: constant Node_Id
:= Parent
(Par
);
6448 if Is_Tagged_Type
(Bas
)
6449 and then Is_Derived_Type
(Bas
)
6450 and then Has_Discriminants
(Par
)
6451 and then Has_Discriminants
(Bas
)
6452 and then Number_Discriminants
(Bas
) /= Number_Discriminants
(Par
)
6453 and then Nkind
(Decl
) = N_Full_Type_Declaration
6454 and then Nkind
(Type_Definition
(Decl
)) = N_Record_Definition
6456 (Variant_Part
(Component_List
(Type_Definition
(Decl
))))
6457 and then Nkind
(N
) /= N_Extension_Aggregate
6460 -- Call init proc to set discriminants.
6461 -- There should eventually be a special procedure for this ???
6463 Ref
:= New_Reference_To
(Defining_Identifier
(N
), Loc
);
6464 Insert_Actions_After
(N
,
6465 Build_Initialization_Call
(Sloc
(N
), Ref
, Typ
));
6467 end Initialize_Discriminants
;
6474 (Obj_Type
: Entity_Id
;
6475 Typ
: Entity_Id
) return Boolean
6477 L1
, L2
, H1
, H2
: Node_Id
;
6479 -- No sliding if the type of the object is not established yet, if it is
6480 -- an unconstrained type whose actual subtype comes from the aggregate,
6481 -- or if the two types are identical.
6483 if not Is_Array_Type
(Obj_Type
) then
6486 elsif not Is_Constrained
(Obj_Type
) then
6489 elsif Typ
= Obj_Type
then
6493 -- Sliding can only occur along the first dimension
6495 Get_Index_Bounds
(First_Index
(Typ
), L1
, H1
);
6496 Get_Index_Bounds
(First_Index
(Obj_Type
), L2
, H2
);
6498 if not Is_Static_Expression
(L1
)
6499 or else not Is_Static_Expression
(L2
)
6500 or else not Is_Static_Expression
(H1
)
6501 or else not Is_Static_Expression
(H2
)
6505 return Expr_Value
(L1
) /= Expr_Value
(L2
)
6506 or else Expr_Value
(H1
) /= Expr_Value
(H2
);
6511 ---------------------------
6512 -- Safe_Slice_Assignment --
6513 ---------------------------
6515 function Safe_Slice_Assignment
(N
: Node_Id
) return Boolean is
6516 Loc
: constant Source_Ptr
:= Sloc
(Parent
(N
));
6517 Pref
: constant Node_Id
:= Prefix
(Name
(Parent
(N
)));
6518 Range_Node
: constant Node_Id
:= Discrete_Range
(Name
(Parent
(N
)));
6526 -- Generate: for J in Range loop Pref (J) := Expr; end loop;
6528 if Comes_From_Source
(N
)
6529 and then No
(Expressions
(N
))
6530 and then Nkind
(First
(Choices
(First
(Component_Associations
(N
)))))
6533 Expr
:= Expression
(First
(Component_Associations
(N
)));
6534 L_J
:= Make_Temporary
(Loc
, 'J');
6537 Make_Iteration_Scheme
(Loc
,
6538 Loop_Parameter_Specification
=>
6539 Make_Loop_Parameter_Specification
6541 Defining_Identifier
=> L_J
,
6542 Discrete_Subtype_Definition
=> Relocate_Node
(Range_Node
)));
6545 Make_Assignment_Statement
(Loc
,
6547 Make_Indexed_Component
(Loc
,
6548 Prefix
=> Relocate_Node
(Pref
),
6549 Expressions
=> New_List
(New_Occurrence_Of
(L_J
, Loc
))),
6550 Expression
=> Relocate_Node
(Expr
));
6552 -- Construct the final loop
6555 Make_Implicit_Loop_Statement
6556 (Node
=> Parent
(N
),
6557 Identifier
=> Empty
,
6558 Iteration_Scheme
=> L_Iter
,
6559 Statements
=> New_List
(L_Body
));
6561 -- Set type of aggregate to be type of lhs in assignment,
6562 -- to suppress redundant length checks.
6564 Set_Etype
(N
, Etype
(Name
(Parent
(N
))));
6566 Rewrite
(Parent
(N
), Stat
);
6567 Analyze
(Parent
(N
));
6573 end Safe_Slice_Assignment
;
6575 ---------------------
6576 -- Sort_Case_Table --
6577 ---------------------
6579 procedure Sort_Case_Table
(Case_Table
: in out Case_Table_Type
) is
6580 L
: constant Int
:= Case_Table
'First;
6581 U
: constant Int
:= Case_Table
'Last;
6589 T
:= Case_Table
(K
+ 1);
6593 and then Expr_Value
(Case_Table
(J
- 1).Choice_Lo
) >
6594 Expr_Value
(T
.Choice_Lo
)
6596 Case_Table
(J
) := Case_Table
(J
- 1);
6600 Case_Table
(J
) := T
;
6603 end Sort_Case_Table
;
6605 ----------------------------
6606 -- Static_Array_Aggregate --
6607 ----------------------------
6609 function Static_Array_Aggregate
(N
: Node_Id
) return Boolean is
6610 Bounds
: constant Node_Id
:= Aggregate_Bounds
(N
);
6612 Typ
: constant Entity_Id
:= Etype
(N
);
6613 Comp_Type
: constant Entity_Id
:= Component_Type
(Typ
);
6620 if Is_Tagged_Type
(Typ
)
6621 or else Is_Controlled
(Typ
)
6622 or else Is_Packed
(Typ
)
6628 and then Nkind
(Bounds
) = N_Range
6629 and then Nkind
(Low_Bound
(Bounds
)) = N_Integer_Literal
6630 and then Nkind
(High_Bound
(Bounds
)) = N_Integer_Literal
6632 Lo
:= Low_Bound
(Bounds
);
6633 Hi
:= High_Bound
(Bounds
);
6635 if No
(Component_Associations
(N
)) then
6637 -- Verify that all components are static integers
6639 Expr
:= First
(Expressions
(N
));
6640 while Present
(Expr
) loop
6641 if Nkind
(Expr
) /= N_Integer_Literal
then
6651 -- We allow only a single named association, either a static
6652 -- range or an others_clause, with a static expression.
6654 Expr
:= First
(Component_Associations
(N
));
6656 if Present
(Expressions
(N
)) then
6659 elsif Present
(Next
(Expr
)) then
6662 elsif Present
(Next
(First
(Choices
(Expr
)))) then
6666 -- The aggregate is static if all components are literals,
6667 -- or else all its components are static aggregates for the
6668 -- component type. We also limit the size of a static aggregate
6669 -- to prevent runaway static expressions.
6671 if Is_Array_Type
(Comp_Type
)
6672 or else Is_Record_Type
(Comp_Type
)
6674 if Nkind
(Expression
(Expr
)) /= N_Aggregate
6676 not Compile_Time_Known_Aggregate
(Expression
(Expr
))
6681 elsif Nkind
(Expression
(Expr
)) /= N_Integer_Literal
then
6684 elsif not Aggr_Size_OK
(N
, Typ
) then
6688 -- Create a positional aggregate with the right number of
6689 -- copies of the expression.
6691 Agg
:= Make_Aggregate
(Sloc
(N
), New_List
, No_List
);
6693 for I
in UI_To_Int
(Intval
(Lo
)) .. UI_To_Int
(Intval
(Hi
))
6696 (Expressions
(Agg
), New_Copy
(Expression
(Expr
)));
6698 -- The copied expression must be analyzed and resolved.
6699 -- Besides setting the type, this ensures that static
6700 -- expressions are appropriately marked as such.
6703 (Last
(Expressions
(Agg
)), Component_Type
(Typ
));
6706 Set_Aggregate_Bounds
(Agg
, Bounds
);
6707 Set_Etype
(Agg
, Typ
);
6710 Set_Compile_Time_Known_Aggregate
(N
);
6719 end Static_Array_Aggregate
;