1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2023, 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 Aspects
; use Aspects
;
27 with Atree
; use Atree
;
28 with Checks
; use Checks
;
29 with Einfo
; use Einfo
;
30 with Einfo
.Entities
; use Einfo
.Entities
;
31 with Einfo
.Utils
; use Einfo
.Utils
;
32 with Elists
; use Elists
;
33 with Errout
; use Errout
;
34 with Expander
; use Expander
;
35 with Exp_Ch6
; use Exp_Ch6
;
36 with Exp_Tss
; use Exp_Tss
;
37 with Exp_Util
; use Exp_Util
;
38 with Freeze
; use Freeze
;
39 with Itypes
; use Itypes
;
41 with Lib
.Xref
; use Lib
.Xref
;
42 with Namet
; use Namet
;
43 with Namet
.Sp
; use Namet
.Sp
;
44 with Nmake
; use Nmake
;
45 with Nlists
; use Nlists
;
47 with Restrict
; use Restrict
;
48 with Rident
; use Rident
;
50 with Sem_Aux
; use Sem_Aux
;
51 with Sem_Case
; use Sem_Case
;
52 with Sem_Cat
; use Sem_Cat
;
53 with Sem_Ch3
; use Sem_Ch3
;
54 with Sem_Ch8
; use Sem_Ch8
;
55 with Sem_Ch13
; use Sem_Ch13
;
56 with Sem_Dim
; use Sem_Dim
;
57 with Sem_Eval
; use Sem_Eval
;
58 with Sem_Res
; use Sem_Res
;
59 with Sem_Util
; use Sem_Util
;
60 with Sem_Type
; use Sem_Type
;
61 with Sem_Warn
; use Sem_Warn
;
62 with Sinfo
; use Sinfo
;
63 with Sinfo
.Nodes
; use Sinfo
.Nodes
;
64 with Sinfo
.Utils
; use Sinfo
.Utils
;
65 with Snames
; use Snames
;
66 with Stringt
; use Stringt
;
67 with Stand
; use Stand
;
68 with Style
; use Style
;
69 with Targparm
; use Targparm
;
70 with Tbuild
; use Tbuild
;
71 with Ttypes
; use Ttypes
;
72 with Uintp
; use Uintp
;
73 with Warnsw
; use Warnsw
;
75 package body Sem_Aggr
is
77 type Case_Bounds
is record
79 -- Low bound of choice. Once we sort the Case_Table, then entries
80 -- will be in order of ascending Choice_Lo values.
83 -- High Bound of choice. The sort does not pay any attention to the
84 -- high bound, so choices 1 .. 4 and 1 .. 5 could be in either order.
87 -- If there are duplicates or missing entries, then in the sorted
88 -- table, this records the highest value among Choice_Hi values
89 -- seen so far, including this entry.
92 -- The node of the choice
95 type Case_Table_Type
is array (Pos
range <>) of Case_Bounds
;
96 -- Table type used by Check_Case_Choices procedure
98 -----------------------
99 -- Local Subprograms --
100 -----------------------
102 procedure Sort_Case_Table
(Case_Table
: in out Case_Table_Type
);
103 -- Sort the Case Table using the Lower Bound of each Choice as the key. A
104 -- simple insertion sort is used since the choices in a case statement will
105 -- usually be in near sorted order.
107 procedure Check_Can_Never_Be_Null
(Typ
: Entity_Id
; Expr
: Node_Id
);
108 -- Ada 2005 (AI-231): Check bad usage of null for a component for which
109 -- null exclusion (NOT NULL) is specified. Typ can be an E_Array_Type for
110 -- the array case (the component type of the array will be used) or an
111 -- E_Component/E_Discriminant entity in the record case, in which case the
112 -- type of the component will be used for the test. If Typ is any other
113 -- kind of entity, the call is ignored. Expr is the component node in the
114 -- aggregate which is known to have a null value. A warning message will be
115 -- issued if the component is null excluding.
117 -- It would be better to pass the proper type for Typ ???
119 procedure Check_Expr_OK_In_Limited_Aggregate
(Expr
: Node_Id
);
120 -- Check that Expr is either not limited or else is one of the cases of
121 -- expressions allowed for a limited component association (namely, an
122 -- aggregate, function call, or <> notation). Report error for violations.
123 -- Expression is also OK in an instance or inlining context, because we
124 -- have already preanalyzed and it is known to be type correct.
126 ------------------------------------------------------
127 -- Subprograms used for RECORD AGGREGATE Processing --
128 ------------------------------------------------------
130 procedure Resolve_Record_Aggregate
(N
: Node_Id
; Typ
: Entity_Id
);
131 -- This procedure performs all the semantic checks required for record
132 -- aggregates. Note that for aggregates analysis and resolution go
133 -- hand in hand. Aggregate analysis has been delayed up to here and
134 -- it is done while resolving the aggregate.
136 -- N is the N_Aggregate node.
137 -- Typ is the record type for the aggregate resolution
139 -- While performing the semantic checks, this procedure builds a new
140 -- Component_Association_List where each record field appears alone in a
141 -- Component_Choice_List along with its corresponding expression. The
142 -- record fields in the Component_Association_List appear in the same order
143 -- in which they appear in the record type Typ.
145 -- Once this new Component_Association_List is built and all the semantic
146 -- checks performed, the original aggregate subtree is replaced with the
147 -- new named record aggregate just built. This new record aggregate has no
148 -- positional associations, so its Expressions field is set to No_List.
149 -- Note that subtree substitution is performed with Rewrite so as to be
150 -- able to retrieve the original aggregate.
152 -- The aggregate subtree manipulation performed by Resolve_Record_Aggregate
153 -- yields the aggregate format expected by Gigi. Typically, this kind of
154 -- tree manipulations are done in the expander. However, because the
155 -- semantic checks that need to be performed on record aggregates really go
156 -- hand in hand with the record aggregate normalization, the aggregate
157 -- subtree transformation is performed during resolution rather than
158 -- expansion. Had we decided otherwise we would have had to duplicate most
159 -- of the code in the expansion procedure Expand_Record_Aggregate. Note,
160 -- however, that all the expansion concerning aggregates for tagged records
161 -- is done in Expand_Record_Aggregate.
163 -- The algorithm of Resolve_Record_Aggregate proceeds as follows:
165 -- 1. Make sure that the record type against which the record aggregate
166 -- has to be resolved is not abstract. Furthermore if the type is a
167 -- null aggregate make sure the input aggregate N is also null.
169 -- 2. Verify that the structure of the aggregate is that of a record
170 -- aggregate. Specifically, look for component associations and ensure
171 -- that each choice list only has identifiers or the N_Others_Choice
172 -- node. Also make sure that if present, the N_Others_Choice occurs
173 -- last and by itself.
175 -- 3. If Typ contains discriminants, the values for each discriminant is
176 -- looked for. If the record type Typ has variants, we check that the
177 -- expressions corresponding to each discriminant ruling the (possibly
178 -- nested) variant parts of Typ, are static. This allows us to determine
179 -- the variant parts to which the rest of the aggregate must conform.
180 -- The names of discriminants with their values are saved in a new
181 -- association list, New_Assoc_List which is later augmented with the
182 -- names and values of the remaining components in the record type.
184 -- During this phase we also make sure that every discriminant is
185 -- assigned exactly one value. Note that when several values for a given
186 -- discriminant are found, semantic processing continues looking for
187 -- further errors. In this case it's the first discriminant value found
188 -- which we will be recorded.
190 -- IMPORTANT NOTE: For derived tagged types this procedure expects
191 -- First_Discriminant and Next_Discriminant to give the correct list
192 -- of discriminants, in the correct order.
194 -- 4. After all the discriminant values have been gathered, we can set the
195 -- Etype of the record aggregate. If Typ contains no discriminants this
196 -- is straightforward: the Etype of N is just Typ, otherwise a new
197 -- implicit constrained subtype of Typ is built to be the Etype of N.
199 -- 5. Gather the remaining record components according to the discriminant
200 -- values. This involves recursively traversing the record type
201 -- structure to see what variants are selected by the given discriminant
202 -- values. This processing is a little more convoluted if Typ is a
203 -- derived tagged types since we need to retrieve the record structure
204 -- of all the ancestors of Typ.
206 -- 6. After gathering the record components we look for their values in the
207 -- record aggregate and emit appropriate error messages should we not
208 -- find such values or should they be duplicated.
210 -- 7. We then make sure no illegal component names appear in the record
211 -- aggregate and make sure that the type of the record components
212 -- appearing in a same choice list is the same. Finally we ensure that
213 -- the others choice, if present, is used to provide the value of at
214 -- least a record component.
216 -- 8. The original aggregate node is replaced with the new named aggregate
217 -- built in steps 3 through 6, as explained earlier.
219 -- Given the complexity of record aggregate resolution, the primary goal of
220 -- this routine is clarity and simplicity rather than execution and storage
221 -- efficiency. If there are only positional components in the aggregate the
222 -- running time is linear. If there are associations the running time is
223 -- still linear as long as the order of the associations is not too far off
224 -- the order of the components in the record type. If this is not the case
225 -- the running time is at worst quadratic in the size of the association
228 procedure Check_Misspelled_Component
229 (Elements
: Elist_Id
;
230 Component
: Node_Id
);
231 -- Give possible misspelling diagnostic if Component is likely to be a
232 -- misspelling of one of the components of the Assoc_List. This is called
233 -- by Resolve_Aggr_Expr after producing an invalid component error message.
235 -----------------------------------------------------
236 -- Subprograms used for ARRAY AGGREGATE Processing --
237 -----------------------------------------------------
239 function Resolve_Array_Aggregate
242 Index_Constr
: Node_Id
;
243 Component_Typ
: Entity_Id
;
244 Others_Allowed
: Boolean) return Boolean;
245 -- This procedure performs the semantic checks for an array aggregate.
246 -- True is returned if the aggregate resolution succeeds.
248 -- The procedure works by recursively checking each nested aggregate.
249 -- Specifically, after checking a sub-aggregate nested at the i-th level
250 -- we recursively check all the subaggregates at the i+1-st level (if any).
251 -- Note that aggregates analysis and resolution go hand in hand.
252 -- Aggregate analysis has been delayed up to here and it is done while
253 -- resolving the aggregate.
255 -- N is the current N_Aggregate node to be checked.
257 -- Index is the index node corresponding to the array sub-aggregate that
258 -- we are currently checking (RM 4.3.3 (8)). Its Etype is the
259 -- corresponding index type (or subtype).
261 -- Index_Constr is the node giving the applicable index constraint if
262 -- any (RM 4.3.3 (10)). It "is a constraint provided by certain
263 -- contexts [...] that can be used to determine the bounds of the array
264 -- value specified by the aggregate". If Others_Allowed below is False
265 -- there is no applicable index constraint and this node is set to Index.
267 -- Component_Typ is the array component type.
269 -- Others_Allowed indicates whether an others choice is allowed
270 -- in the context where the top-level aggregate appeared.
272 -- The algorithm of Resolve_Array_Aggregate proceeds as follows:
274 -- 1. Make sure that the others choice, if present, is by itself and
275 -- appears last in the sub-aggregate. Check that we do not have
276 -- positional and named components in the array sub-aggregate (unless
277 -- the named association is an others choice). Finally if an others
278 -- choice is present, make sure it is allowed in the aggregate context.
280 -- 2. If the array sub-aggregate contains discrete_choices:
282 -- (A) Verify their validity. Specifically verify that:
284 -- (a) If a null range is present it must be the only possible
285 -- choice in the array aggregate.
287 -- (b) Ditto for a non static range.
289 -- (c) Ditto for a non static expression.
291 -- In addition this step analyzes and resolves each discrete_choice,
292 -- making sure that its type is the type of the corresponding Index.
293 -- If we are not at the lowest array aggregate level (in the case of
294 -- multi-dimensional aggregates) then invoke Resolve_Array_Aggregate
295 -- recursively on each component expression. Otherwise, resolve the
296 -- bottom level component expressions against the expected component
297 -- type ONLY IF the component corresponds to a single discrete choice
298 -- which is not an others choice (to see why read the DELAYED
299 -- COMPONENT RESOLUTION below).
301 -- (B) Determine the bounds of the sub-aggregate and lowest and
302 -- highest choice values.
304 -- 3. For positional aggregates:
306 -- (A) Loop over the component expressions either recursively invoking
307 -- Resolve_Array_Aggregate on each of these for multi-dimensional
308 -- array aggregates or resolving the bottom level component
309 -- expressions against the expected component type.
311 -- (B) Determine the bounds of the positional sub-aggregates.
313 -- 4. Try to determine statically whether the evaluation of the array
314 -- sub-aggregate raises Constraint_Error. If yes emit proper
315 -- warnings. The precise checks are the following:
317 -- (A) Check that the index range defined by aggregate bounds is
318 -- compatible with corresponding index subtype.
319 -- We also check against the base type. In fact it could be that
320 -- Low/High bounds of the base type are static whereas those of
321 -- the index subtype are not. Thus if we can statically catch
322 -- a problem with respect to the base type we are guaranteed
323 -- that the same problem will arise with the index subtype
325 -- (B) If we are dealing with a named aggregate containing an others
326 -- choice and at least one discrete choice then make sure the range
327 -- specified by the discrete choices does not overflow the
328 -- aggregate bounds. We also check against the index type and base
329 -- type bounds for the same reasons given in (A).
331 -- (C) If we are dealing with a positional aggregate with an others
332 -- choice make sure the number of positional elements specified
333 -- does not overflow the aggregate bounds. We also check against
334 -- the index type and base type bounds as mentioned in (A).
336 -- Finally construct an N_Range node giving the sub-aggregate bounds.
337 -- Set the Aggregate_Bounds field of the sub-aggregate to be this
338 -- N_Range. The routine Array_Aggr_Subtype below uses such N_Ranges
339 -- to build the appropriate aggregate subtype. Aggregate_Bounds
340 -- information is needed during expansion.
342 -- DELAYED COMPONENT RESOLUTION: The resolution of bottom level component
343 -- expressions in an array aggregate may call Duplicate_Subexpr or some
344 -- other routine that inserts code just outside the outermost aggregate.
345 -- If the array aggregate contains discrete choices or an others choice,
346 -- this may be wrong. Consider for instance the following example.
348 -- type Rec is record
352 -- type Acc_Rec is access Rec;
353 -- Arr : array (1..3) of Acc_Rec := (1 .. 3 => new Rec);
355 -- Then the transformation of "new Rec" that occurs during resolution
356 -- entails the following code modifications
358 -- P7b : constant Acc_Rec := new Rec;
360 -- Arr : array (1..3) of Acc_Rec := (1 .. 3 => P7b);
362 -- This code transformation is clearly wrong, since we need to call
363 -- "new Rec" for each of the 3 array elements. To avoid this problem we
364 -- delay resolution of the components of non positional array aggregates
365 -- to the expansion phase. As an optimization, if the discrete choice
366 -- specifies a single value we do not delay resolution.
368 function Array_Aggr_Subtype
(N
: Node_Id
; Typ
: Entity_Id
) return Entity_Id
;
369 -- This routine returns the type or subtype of an array aggregate.
371 -- N is the array aggregate node whose type we return.
373 -- Typ is the context type in which N occurs.
375 -- This routine creates an implicit array subtype whose bounds are
376 -- those defined by the aggregate. When this routine is invoked
377 -- Resolve_Array_Aggregate has already processed aggregate N. Thus the
378 -- Aggregate_Bounds of each sub-aggregate, is an N_Range node giving the
379 -- sub-aggregate bounds. When building the aggregate itype, this function
380 -- traverses the array aggregate N collecting such Aggregate_Bounds and
381 -- constructs the proper array aggregate itype.
383 -- Note that in the case of multidimensional aggregates each inner
384 -- sub-aggregate corresponding to a given array dimension, may provide a
385 -- different bounds. If it is possible to determine statically that
386 -- some sub-aggregates corresponding to the same index do not have the
387 -- same bounds, then a warning is emitted. If such check is not possible
388 -- statically (because some sub-aggregate bounds are dynamic expressions)
389 -- then this job is left to the expander. In all cases the particular
390 -- bounds that this function will chose for a given dimension is the first
391 -- N_Range node for a sub-aggregate corresponding to that dimension.
393 -- Note that the Raises_Constraint_Error flag of an array aggregate
394 -- whose evaluation is determined to raise CE by Resolve_Array_Aggregate,
395 -- is set in Resolve_Array_Aggregate but the aggregate is not
396 -- immediately replaced with a raise CE. In fact, Array_Aggr_Subtype must
397 -- first construct the proper itype for the aggregate (Gigi needs
398 -- this). After constructing the proper itype we will eventually replace
399 -- the top-level aggregate with a raise CE (done in Resolve_Aggregate).
400 -- Of course in cases such as:
402 -- type Arr is array (integer range <>) of Integer;
403 -- A : Arr := (positive range -1 .. 2 => 0);
405 -- The bounds of the aggregate itype are cooked up to look reasonable
406 -- (in this particular case the bounds will be 1 .. 2).
408 procedure Make_String_Into_Aggregate
(N
: Node_Id
);
409 -- A string literal can appear in a context in which a one dimensional
410 -- array of characters is expected. This procedure simply rewrites the
411 -- string as an aggregate, prior to resolution.
413 function Resolve_Null_Array_Aggregate
(N
: Node_Id
) return Boolean;
414 -- For the Ada 2022 construct, build a subtype with a null range for each
415 -- dimension, using the bounds from the context subtype (if the subtype
416 -- is constrained). If the subtype is unconstrained, then the bounds
417 -- are determined in much the same way as the bounds for a null string
418 -- literal with no applicable index constraint.
420 ---------------------------------
421 -- Delta aggregate processing --
422 ---------------------------------
424 procedure Resolve_Delta_Array_Aggregate
(N
: Node_Id
; Typ
: Entity_Id
);
425 procedure Resolve_Delta_Record_Aggregate
(N
: Node_Id
; Typ
: Entity_Id
);
427 ------------------------
428 -- Array_Aggr_Subtype --
429 ------------------------
431 function Array_Aggr_Subtype
433 Typ
: Entity_Id
) return Entity_Id
435 Aggr_Dimension
: constant Pos
:= Number_Dimensions
(Typ
);
436 -- Number of aggregate index dimensions
438 Aggr_Range
: array (1 .. Aggr_Dimension
) of Node_Id
:= (others => Empty
);
439 -- Constrained N_Range of each index dimension in our aggregate itype
441 Aggr_Low
: array (1 .. Aggr_Dimension
) of Node_Id
:= (others => Empty
);
442 Aggr_High
: array (1 .. Aggr_Dimension
) of Node_Id
:= (others => Empty
);
443 -- Low and High bounds for each index dimension in our aggregate itype
445 Is_Fully_Positional
: Boolean := True;
447 procedure Collect_Aggr_Bounds
(N
: Node_Id
; Dim
: Pos
);
448 -- N is an array (sub-)aggregate. Dim is the dimension corresponding
449 -- to (sub-)aggregate N. This procedure collects and removes the side
450 -- effects of the constrained N_Range nodes corresponding to each index
451 -- dimension of our aggregate itype. These N_Range nodes are collected
452 -- in Aggr_Range above.
454 -- Likewise collect in Aggr_Low & Aggr_High above the low and high
455 -- bounds of each index dimension. If, when collecting, two bounds
456 -- corresponding to the same dimension are static and found to differ,
457 -- then emit a warning, and mark N as raising Constraint_Error.
459 -------------------------
460 -- Collect_Aggr_Bounds --
461 -------------------------
463 procedure Collect_Aggr_Bounds
(N
: Node_Id
; Dim
: Pos
) is
464 This_Range
: constant Node_Id
:= Aggregate_Bounds
(N
);
465 -- The aggregate range node of this specific sub-aggregate
467 This_Low
: constant Node_Id
:= Low_Bound
(This_Range
);
468 This_High
: constant Node_Id
:= High_Bound
(This_Range
);
469 -- The aggregate bounds of this specific sub-aggregate
475 Remove_Side_Effects
(This_Low
, Variable_Ref
=> True);
476 Remove_Side_Effects
(This_High
, Variable_Ref
=> True);
478 -- Collect the first N_Range for a given dimension that you find.
479 -- For a given dimension they must be all equal anyway.
481 if No
(Aggr_Range
(Dim
)) then
482 Aggr_Low
(Dim
) := This_Low
;
483 Aggr_High
(Dim
) := This_High
;
484 Aggr_Range
(Dim
) := This_Range
;
487 if Compile_Time_Known_Value
(This_Low
) then
488 if not Compile_Time_Known_Value
(Aggr_Low
(Dim
)) then
489 Aggr_Low
(Dim
) := This_Low
;
491 elsif Expr_Value
(This_Low
) /= Expr_Value
(Aggr_Low
(Dim
)) then
492 Set_Raises_Constraint_Error
(N
);
493 Error_Msg_Warn
:= SPARK_Mode
/= On
;
494 Error_Msg_N
("sub-aggregate low bound mismatch<<", N
);
495 Error_Msg_N
("\Constraint_Error [<<", N
);
499 if Compile_Time_Known_Value
(This_High
) then
500 if not Compile_Time_Known_Value
(Aggr_High
(Dim
)) then
501 Aggr_High
(Dim
) := This_High
;
504 Expr_Value
(This_High
) /= Expr_Value
(Aggr_High
(Dim
))
506 Set_Raises_Constraint_Error
(N
);
507 Error_Msg_Warn
:= SPARK_Mode
/= On
;
508 Error_Msg_N
("sub-aggregate high bound mismatch<<", N
);
509 Error_Msg_N
("\Constraint_Error [<<", N
);
514 if Dim
< Aggr_Dimension
then
516 -- Process positional components
518 if Present
(Expressions
(N
)) then
519 Expr
:= First
(Expressions
(N
));
520 while Present
(Expr
) loop
521 Collect_Aggr_Bounds
(Expr
, Dim
+ 1);
526 -- Process component associations
528 if Present
(Component_Associations
(N
)) then
529 Is_Fully_Positional
:= False;
531 Assoc
:= First
(Component_Associations
(N
));
532 while Present
(Assoc
) loop
533 Expr
:= Expression
(Assoc
);
534 Collect_Aggr_Bounds
(Expr
, Dim
+ 1);
539 end Collect_Aggr_Bounds
;
541 -- Array_Aggr_Subtype variables
544 -- The final itype of the overall aggregate
546 Index_Constraints
: constant List_Id
:= New_List
;
547 -- The list of index constraints of the aggregate itype
549 -- Start of processing for Array_Aggr_Subtype
552 -- Make sure that the list of index constraints is properly attached to
553 -- the tree, and then collect the aggregate bounds.
555 -- If no aggregaate bounds have been set, this is an aggregate with
556 -- iterator specifications and a dynamic size to be determined by
557 -- first pass of expanded code.
559 if No
(Aggregate_Bounds
(N
)) then
563 Set_Parent
(Index_Constraints
, N
);
565 -- When resolving a null aggregate we created a list of aggregate bounds
566 -- for the consecutive dimensions. The bounds for the first dimension
567 -- are attached as the Aggregate_Bounds of the aggregate node.
569 if Is_Null_Aggregate
(N
) then
571 This_Range
: Node_Id
:= Aggregate_Bounds
(N
);
573 for J
in 1 .. Aggr_Dimension
loop
574 Aggr_Range
(J
) := This_Range
;
575 Next_Index
(This_Range
);
577 -- Remove bounds from the list, so they can be reattached as
578 -- the First_Index/Next_Index again by the code that also
579 -- handles non-null aggregates.
581 Remove
(Aggr_Range
(J
));
585 Collect_Aggr_Bounds
(N
, 1);
588 -- Build the list of constrained indexes of our aggregate itype
590 for J
in 1 .. Aggr_Dimension
loop
591 Create_Index
: declare
592 Index_Base
: constant Entity_Id
:=
593 Base_Type
(Etype
(Aggr_Range
(J
)));
594 Index_Typ
: Entity_Id
;
597 -- Construct the Index subtype, and associate it with the range
598 -- construct that generates it.
601 Create_Itype
(Subtype_Kind
(Ekind
(Index_Base
)), Aggr_Range
(J
));
603 Set_Etype
(Index_Typ
, Index_Base
);
605 if Is_Character_Type
(Index_Base
) then
606 Set_Is_Character_Type
(Index_Typ
);
609 Set_Size_Info
(Index_Typ
, (Index_Base
));
610 Set_RM_Size
(Index_Typ
, RM_Size
(Index_Base
));
611 Set_First_Rep_Item
(Index_Typ
, First_Rep_Item
(Index_Base
));
612 Set_Scalar_Range
(Index_Typ
, Aggr_Range
(J
));
614 if Is_Discrete_Or_Fixed_Point_Type
(Index_Typ
) then
615 Set_RM_Size
(Index_Typ
, UI_From_Int
(Minimum_Size
(Index_Typ
)));
618 Set_Etype
(Aggr_Range
(J
), Index_Typ
);
620 Append
(Aggr_Range
(J
), To
=> Index_Constraints
);
624 -- Now build the Itype
626 Itype
:= Create_Itype
(E_Array_Subtype
, N
);
628 Set_First_Rep_Item
(Itype
, First_Rep_Item
(Typ
));
629 Set_Convention
(Itype
, Convention
(Typ
));
630 Set_Depends_On_Private
(Itype
, Has_Private_Component
(Typ
));
631 Set_Etype
(Itype
, Base_Type
(Typ
));
632 Set_Has_Alignment_Clause
(Itype
, Has_Alignment_Clause
(Typ
));
633 Set_Is_Aliased
(Itype
, Is_Aliased
(Typ
));
634 Set_Is_Independent
(Itype
, Is_Independent
(Typ
));
635 Set_Depends_On_Private
(Itype
, Depends_On_Private
(Typ
));
637 Copy_Suppress_Status
(Index_Check
, Typ
, Itype
);
638 Copy_Suppress_Status
(Length_Check
, Typ
, Itype
);
640 Set_First_Index
(Itype
, First
(Index_Constraints
));
641 Set_Is_Constrained
(Itype
, True);
642 Set_Is_Internal
(Itype
, True);
644 if Has_Predicates
(Typ
) then
645 Set_Has_Predicates
(Itype
);
647 -- If the base type has a predicate, capture the predicated parent
648 -- or the existing predicate function for SPARK use.
650 if Present
(Predicate_Function
(Typ
)) then
651 Set_Predicate_Function
(Itype
, Predicate_Function
(Typ
));
653 elsif Is_Itype
(Typ
) then
654 Set_Predicated_Parent
(Itype
, Predicated_Parent
(Typ
));
657 Set_Predicated_Parent
(Itype
, Typ
);
661 -- A simple optimization: purely positional aggregates of static
662 -- components should be passed to gigi unexpanded whenever possible, and
663 -- regardless of the staticness of the bounds themselves. Subsequent
664 -- checks in exp_aggr verify that type is not packed, etc.
666 Set_Size_Known_At_Compile_Time
669 and then Comes_From_Source
(N
)
670 and then Size_Known_At_Compile_Time
(Component_Type
(Typ
)));
672 -- We always need a freeze node for a packed array subtype, so that we
673 -- can build the Packed_Array_Impl_Type corresponding to the subtype. If
674 -- expansion is disabled, the packed array subtype is not built, and we
675 -- must not generate a freeze node for the type, or else it will appear
676 -- incomplete to gigi.
679 and then not In_Spec_Expression
680 and then Expander_Active
682 Freeze_Itype
(Itype
, N
);
686 end Array_Aggr_Subtype
;
688 --------------------------------
689 -- Check_Misspelled_Component --
690 --------------------------------
692 procedure Check_Misspelled_Component
693 (Elements
: Elist_Id
;
696 Max_Suggestions
: constant := 2;
698 Nr_Of_Suggestions
: Natural := 0;
699 Suggestion_1
: Entity_Id
:= Empty
;
700 Suggestion_2
: Entity_Id
:= Empty
;
701 Component_Elmt
: Elmt_Id
;
704 -- All the components of List are matched against Component and a count
705 -- is maintained of possible misspellings. When at the end of the
706 -- analysis there are one or two (not more) possible misspellings,
707 -- these misspellings will be suggested as possible corrections.
709 Component_Elmt
:= First_Elmt
(Elements
);
710 while Nr_Of_Suggestions
<= Max_Suggestions
711 and then Present
(Component_Elmt
)
713 if Is_Bad_Spelling_Of
714 (Chars
(Node
(Component_Elmt
)),
717 Nr_Of_Suggestions
:= Nr_Of_Suggestions
+ 1;
719 case Nr_Of_Suggestions
is
720 when 1 => Suggestion_1
:= Node
(Component_Elmt
);
721 when 2 => Suggestion_2
:= Node
(Component_Elmt
);
726 Next_Elmt
(Component_Elmt
);
729 -- Report at most two suggestions
731 if Nr_Of_Suggestions
= 1 then
732 Error_Msg_NE
-- CODEFIX
733 ("\possible misspelling of&", Component
, Suggestion_1
);
735 elsif Nr_Of_Suggestions
= 2 then
736 Error_Msg_Node_2
:= Suggestion_2
;
737 Error_Msg_NE
-- CODEFIX
738 ("\possible misspelling of& or&", Component
, Suggestion_1
);
740 end Check_Misspelled_Component
;
742 ----------------------------------------
743 -- Check_Expr_OK_In_Limited_Aggregate --
744 ----------------------------------------
746 procedure Check_Expr_OK_In_Limited_Aggregate
(Expr
: Node_Id
) is
748 if Is_Limited_Type
(Etype
(Expr
))
749 and then Comes_From_Source
(Expr
)
751 if In_Instance_Body
or else In_Inlined_Body
then
754 elsif not OK_For_Limited_Init
(Etype
(Expr
), Expr
) then
756 ("initialization not allowed for limited types", Expr
);
757 Explain_Limited_Type
(Etype
(Expr
), Expr
);
760 end Check_Expr_OK_In_Limited_Aggregate
;
762 -------------------------
763 -- Is_Others_Aggregate --
764 -------------------------
766 function Is_Others_Aggregate
(Aggr
: Node_Id
) return Boolean is
767 Assoc
: constant List_Id
:= Component_Associations
(Aggr
);
770 return No
(Expressions
(Aggr
))
771 and then Nkind
(First
(Choice_List
(First
(Assoc
)))) = N_Others_Choice
;
772 end Is_Others_Aggregate
;
774 -------------------------
775 -- Is_Single_Aggregate --
776 -------------------------
778 function Is_Single_Aggregate
(Aggr
: Node_Id
) return Boolean is
779 Assoc
: constant List_Id
:= Component_Associations
(Aggr
);
782 return No
(Expressions
(Aggr
))
783 and then No
(Next
(First
(Assoc
)))
784 and then No
(Next
(First
(Choice_List
(First
(Assoc
)))));
785 end Is_Single_Aggregate
;
787 -----------------------
788 -- Is_Null_Aggregate --
789 -----------------------
791 function Is_Null_Aggregate
(N
: Node_Id
) return Boolean is
793 return Ada_Version
>= Ada_2022
794 and then Is_Homogeneous_Aggregate
(N
)
795 and then Is_Empty_List
(Expressions
(N
))
796 and then Is_Empty_List
(Component_Associations
(N
));
797 end Is_Null_Aggregate
;
799 ----------------------------------------
800 -- Is_Null_Array_Aggregate_High_Bound --
801 ----------------------------------------
803 function Is_Null_Array_Aggregate_High_Bound
(N
: Node_Id
) return Boolean is
804 Original_N
: constant Node_Id
:= Original_Node
(N
);
806 return Ada_Version
>= Ada_2022
807 and then not Comes_From_Source
(Original_N
)
808 and then Nkind
(Original_N
) = N_Attribute_Reference
810 Get_Attribute_Id
(Attribute_Name
(Original_N
)) = Attribute_Pred
811 and then Nkind
(Parent
(N
)) in N_Range | N_Op_Le
812 and then not Comes_From_Source
(Parent
(N
));
813 end Is_Null_Array_Aggregate_High_Bound
;
815 --------------------------------
816 -- Make_String_Into_Aggregate --
817 --------------------------------
819 procedure Make_String_Into_Aggregate
(N
: Node_Id
) is
820 Exprs
: constant List_Id
:= New_List
;
821 Loc
: constant Source_Ptr
:= Sloc
(N
);
822 Str
: constant String_Id
:= Strval
(N
);
823 Strlen
: constant Nat
:= String_Length
(Str
);
831 for J
in 1 .. Strlen
loop
832 C
:= Get_String_Char
(Str
, J
);
833 Set_Character_Literal_Name
(C
);
836 Make_Character_Literal
(P
,
838 Char_Literal_Value
=> UI_From_CC
(C
));
839 Set_Etype
(C_Node
, Any_Character
);
840 Append_To
(Exprs
, C_Node
);
843 -- Something special for wide strings???
846 New_N
:= Make_Aggregate
(Loc
, Expressions
=> Exprs
);
847 Set_Analyzed
(New_N
);
848 Set_Etype
(New_N
, Any_Composite
);
851 end Make_String_Into_Aggregate
;
853 -----------------------
854 -- Resolve_Aggregate --
855 -----------------------
857 procedure Resolve_Aggregate
(N
: Node_Id
; Typ
: Entity_Id
) is
858 Loc
: constant Source_Ptr
:= Sloc
(N
);
860 Aggr_Subtyp
: Entity_Id
;
861 -- The actual aggregate subtype. This is not necessarily the same as Typ
862 -- which is the subtype of the context in which the aggregate was found.
864 Others_Box
: Boolean := False;
865 -- Set to True if N represents a simple aggregate with only
866 -- (others => <>), not nested as part of another aggregate.
868 function Is_Full_Access_Aggregate
(N
: Node_Id
) return Boolean;
869 -- If a full access object is initialized with an aggregate or is
870 -- assigned an aggregate, we have to prevent a piecemeal access or
871 -- assignment to the object, even if the aggregate is to be expanded.
872 -- We create a temporary for the aggregate, and assign the temporary
873 -- instead, so that the back end can generate an atomic move for it.
874 -- This is only done in the context of an object declaration or an
875 -- assignment. Function is a noop and returns false in other contexts.
877 function Within_Aggregate
(N
: Node_Id
) return Boolean;
878 -- Return True if N is part of an N_Aggregate
880 ------------------------------
881 -- Is_Full_Access_Aggregate --
882 ------------------------------
884 function Is_Full_Access_Aggregate
(N
: Node_Id
) return Boolean is
885 Loc
: constant Source_Ptr
:= Sloc
(N
);
895 -- Aggregate may be qualified, so find outer context
897 if Nkind
(Par
) = N_Qualified_Expression
then
901 if not Comes_From_Source
(Par
) then
906 when N_Assignment_Statement
=>
907 Typ
:= Etype
(Name
(Par
));
909 if not Is_Full_Access
(Typ
)
910 and then not Is_Full_Access_Object
(Name
(Par
))
915 when N_Object_Declaration
=>
916 Typ
:= Etype
(Defining_Identifier
(Par
));
918 if not Is_Full_Access
(Typ
)
919 and then not Is_Full_Access
(Defining_Identifier
(Par
))
928 Temp
:= Make_Temporary
(Loc
, 'T', N
);
930 Make_Object_Declaration
(Loc
,
931 Defining_Identifier
=> Temp
,
932 Constant_Present
=> True,
933 Object_Definition
=> New_Occurrence_Of
(Typ
, Loc
),
934 Expression
=> Relocate_Node
(N
));
935 Insert_Action
(Par
, New_N
);
937 Rewrite
(N
, New_Occurrence_Of
(Temp
, Loc
));
938 Analyze_And_Resolve
(N
, Typ
);
941 end Is_Full_Access_Aggregate
;
943 ----------------------
944 -- Within_Aggregate --
945 ----------------------
947 function Within_Aggregate
(N
: Node_Id
) return Boolean is
948 P
: Node_Id
:= Parent
(N
);
950 while Present
(P
) loop
951 if Nkind
(P
) = N_Aggregate
then
959 end Within_Aggregate
;
961 -- Start of processing for Resolve_Aggregate
964 -- Ignore junk empty aggregate resulting from parser error
966 if No
(Expressions
(N
))
967 and then No
(Component_Associations
(N
))
968 and then not Null_Record_Present
(N
)
972 -- If the aggregate is assigned to a full access variable, we have
973 -- to prevent a piecemeal assignment even if the aggregate is to be
974 -- expanded. We create a temporary for the aggregate, and assign the
975 -- temporary instead, so that the back end can generate an atomic move
976 -- for it. This is properly an expansion activity but it must be done
977 -- before resolution because aggregate resolution cannot be done twice.
979 elsif Expander_Active
and then Is_Full_Access_Aggregate
(N
) then
983 -- If the aggregate has box-initialized components, its type must be
984 -- frozen so that initialization procedures can properly be called
985 -- in the resolution that follows. The replacement of boxes with
986 -- initialization calls is properly an expansion activity but it must
987 -- be done during resolution.
990 and then Present
(Component_Associations
(N
))
994 First_Comp
: Boolean := True;
997 Comp
:= First
(Component_Associations
(N
));
998 while Present
(Comp
) loop
999 if Box_Present
(Comp
) then
1001 and then No
(Expressions
(N
))
1002 and then Nkind
(First
(Choices
(Comp
))) = N_Others_Choice
1003 and then not Within_Aggregate
(N
)
1008 Insert_Actions
(N
, Freeze_Entity
(Typ
, N
));
1012 First_Comp
:= False;
1018 -- Check for aggregates not allowed in configurable run-time mode.
1019 -- We allow all cases of aggregates that do not come from source, since
1020 -- these are all assumed to be small (e.g. bounds of a string literal).
1021 -- We also allow aggregates of types we know to be small.
1023 if not Support_Aggregates_On_Target
1024 and then Comes_From_Source
(N
)
1025 and then (not Known_Static_Esize
(Typ
)
1026 or else Esize
(Typ
) > System_Max_Integer_Size
)
1028 Error_Msg_CRT
("aggregate", N
);
1031 -- Ada 2005 (AI-287): Limited aggregates allowed
1033 -- In an instance, ignore aggregate subcomponents that may be limited,
1034 -- because they originate in view conflicts. If the original aggregate
1035 -- is legal and the actuals are legal, the aggregate itself is legal.
1037 if Is_Limited_Type
(Typ
)
1038 and then Ada_Version
< Ada_2005
1039 and then not In_Instance
1041 Error_Msg_N
("aggregate type cannot be limited", N
);
1042 Explain_Limited_Type
(Typ
, N
);
1044 elsif Is_Class_Wide_Type
(Typ
) then
1045 Error_Msg_N
("type of aggregate cannot be class-wide", N
);
1047 elsif Typ
= Any_String
1048 or else Typ
= Any_Composite
1050 Error_Msg_N
("no unique type for aggregate", N
);
1051 Set_Etype
(N
, Any_Composite
);
1053 elsif Is_Array_Type
(Typ
) and then Null_Record_Present
(N
) then
1054 Error_Msg_N
("null record forbidden in array aggregate", N
);
1056 elsif Has_Aspect
(Typ
, Aspect_Aggregate
)
1057 and then Ekind
(Typ
) /= E_Record_Type
1058 and then Ada_Version
>= Ada_2022
1060 -- Check for Ada 2022 and () aggregate.
1062 if not Is_Homogeneous_Aggregate
(N
) then
1063 Error_Msg_N
("container aggregate must use '['], not ()", N
);
1066 Resolve_Container_Aggregate
(N
, Typ
);
1068 -- Check Ada 2022 empty aggregate [] initializing a record type that has
1069 -- aspect aggregate; the empty aggregate will be expanded into a call to
1070 -- the empty function specified in the aspect aggregate.
1072 elsif Has_Aspect
(Typ
, Aspect_Aggregate
)
1073 and then Ekind
(Typ
) = E_Record_Type
1074 and then Is_Homogeneous_Aggregate
(N
)
1075 and then Is_Empty_List
(Expressions
(N
))
1076 and then Is_Empty_List
(Component_Associations
(N
))
1077 and then Ada_Version
>= Ada_2022
1079 Resolve_Container_Aggregate
(N
, Typ
);
1081 elsif Is_Record_Type
(Typ
) then
1082 Resolve_Record_Aggregate
(N
, Typ
);
1084 elsif Is_Array_Type
(Typ
) then
1086 -- First a special test, for the case of a positional aggregate of
1087 -- characters which can be replaced by a string literal.
1089 -- Do not perform this transformation if this was a string literal
1090 -- to start with, whose components needed constraint checks, or if
1091 -- the component type is non-static, because it will require those
1092 -- checks and be transformed back into an aggregate. If the index
1093 -- type is not Integer the aggregate may represent a user-defined
1094 -- string type but the context might need the original type so we
1095 -- do not perform the transformation at this point.
1097 if Number_Dimensions
(Typ
) = 1
1098 and then Is_Standard_Character_Type
(Component_Type
(Typ
))
1099 and then No
(Component_Associations
(N
))
1100 and then not Is_Limited_Composite
(Typ
)
1101 and then not Is_Private_Composite
(Typ
)
1102 and then not Is_Bit_Packed_Array
(Typ
)
1103 and then Nkind
(Original_Node
(Parent
(N
))) /= N_String_Literal
1104 and then Is_OK_Static_Subtype
(Component_Type
(Typ
))
1105 and then Base_Type
(Etype
(First_Index
(Typ
))) =
1106 Base_Type
(Standard_Integer
)
1112 Expr
:= First
(Expressions
(N
));
1113 while Present
(Expr
) loop
1114 exit when Nkind
(Expr
) /= N_Character_Literal
;
1121 Expr
:= First
(Expressions
(N
));
1122 while Present
(Expr
) loop
1123 Store_String_Char
(UI_To_CC
(Char_Literal_Value
(Expr
)));
1127 Rewrite
(N
, Make_String_Literal
(Loc
, End_String
));
1129 Analyze_And_Resolve
(N
, Typ
);
1135 -- Here if we have a real aggregate to deal with
1137 Array_Aggregate
: declare
1138 Aggr_Resolved
: Boolean;
1139 Aggr_Typ
: constant Entity_Id
:= Etype
(Typ
);
1140 -- This is the unconstrained array type, which is the type against
1141 -- which the aggregate is to be resolved. Typ itself is the array
1142 -- type of the context which may not be the same subtype as the
1143 -- subtype for the final aggregate.
1145 Is_Null_Aggr
: constant Boolean := Is_Null_Aggregate
(N
);
1148 -- In the following we determine whether an OTHERS choice is
1149 -- allowed inside the array aggregate. The test checks the context
1150 -- in which the array aggregate occurs. If the context does not
1151 -- permit it, or the aggregate type is unconstrained, an OTHERS
1152 -- choice is not allowed (except that it is always allowed on the
1153 -- right-hand side of an assignment statement; in this case the
1154 -- constrainedness of the type doesn't matter, because an array
1155 -- object is always constrained).
1157 -- If expansion is disabled (generic context, or semantics-only
1158 -- mode) actual subtypes cannot be constructed, and the type of an
1159 -- object may be its unconstrained nominal type. However, if the
1160 -- context is an assignment statement, OTHERS is allowed, because
1161 -- the target of the assignment will have a constrained subtype
1162 -- when fully compiled. Ditto if the context is an initialization
1163 -- procedure where a component may have a predicate function that
1164 -- carries the base type.
1166 -- Note that there is no node for Explicit_Actual_Parameter.
1167 -- To test for this context we therefore have to test for node
1168 -- N_Parameter_Association which itself appears only if there is a
1169 -- formal parameter. Consequently we also need to test for
1170 -- N_Procedure_Call_Statement or N_Function_Call.
1172 -- The context may be an N_Reference node, created by expansion.
1173 -- Legality of the others clause was established in the source,
1174 -- so the context is legal.
1176 Set_Etype
(N
, Aggr_Typ
); -- May be overridden later on
1178 if Is_Null_Aggr
then
1180 Aggr_Resolved
:= Resolve_Null_Array_Aggregate
(N
);
1182 elsif Nkind
(Parent
(N
)) = N_Assignment_Statement
1183 or else Inside_Init_Proc
1184 or else (Is_Constrained
(Typ
)
1185 and then Nkind
(Parent
(N
)) in
1186 N_Parameter_Association
1188 | N_Procedure_Call_Statement
1189 | N_Generic_Association
1190 | N_Formal_Object_Declaration
1191 | N_Simple_Return_Statement
1192 | N_Object_Declaration
1193 | N_Component_Declaration
1194 | N_Parameter_Specification
1195 | N_Qualified_Expression
1196 | N_Unchecked_Type_Conversion
1199 | N_Extension_Aggregate
1200 | N_Component_Association
1201 | N_Case_Expression_Alternative
1203 | N_Expression_With_Actions
)
1206 Resolve_Array_Aggregate
1208 Index
=> First_Index
(Aggr_Typ
),
1209 Index_Constr
=> First_Index
(Typ
),
1210 Component_Typ
=> Component_Type
(Typ
),
1211 Others_Allowed
=> True);
1214 Resolve_Array_Aggregate
1216 Index
=> First_Index
(Aggr_Typ
),
1217 Index_Constr
=> First_Index
(Aggr_Typ
),
1218 Component_Typ
=> Component_Type
(Typ
),
1219 Others_Allowed
=> False);
1222 if not Aggr_Resolved
then
1224 -- A parenthesized expression may have been intended as an
1225 -- aggregate, leading to a type error when analyzing the
1226 -- component. This can also happen for a nested component
1227 -- (see Analyze_Aggr_Expr).
1229 if Paren_Count
(N
) > 0 then
1231 ("positional aggregate cannot have one component", N
);
1234 Aggr_Subtyp
:= Any_Composite
;
1237 Aggr_Subtyp
:= Array_Aggr_Subtype
(N
, Typ
);
1240 Set_Etype
(N
, Aggr_Subtyp
);
1241 end Array_Aggregate
;
1243 elsif Is_Private_Type
(Typ
)
1244 and then Present
(Full_View
(Typ
))
1245 and then (In_Inlined_Body
or In_Instance_Body
)
1246 and then Is_Composite_Type
(Full_View
(Typ
))
1248 Resolve
(N
, Full_View
(Typ
));
1251 Error_Msg_N
("illegal context for aggregate", N
);
1254 -- If we can determine statically that the evaluation of the aggregate
1255 -- raises Constraint_Error, then replace the aggregate with an
1256 -- N_Raise_Constraint_Error node, but set the Etype to the right
1257 -- aggregate subtype. Gigi needs this.
1259 if Raises_Constraint_Error
(N
) then
1260 Aggr_Subtyp
:= Etype
(N
);
1262 Make_Raise_Constraint_Error
(Loc
, Reason
=> CE_Range_Check_Failed
));
1263 Set_Raises_Constraint_Error
(N
);
1264 Set_Etype
(N
, Aggr_Subtyp
);
1268 if Warn_On_No_Value_Assigned
1270 and then not Is_Fully_Initialized_Type
(Etype
(N
))
1272 Error_Msg_N
("?v?aggregate not fully initialized", N
);
1275 Check_Function_Writable_Actuals
(N
);
1276 end Resolve_Aggregate
;
1278 -----------------------------
1279 -- Resolve_Array_Aggregate --
1280 -----------------------------
1282 function Resolve_Array_Aggregate
1285 Index_Constr
: Node_Id
;
1286 Component_Typ
: Entity_Id
;
1287 Others_Allowed
: Boolean) return Boolean
1289 Loc
: constant Source_Ptr
:= Sloc
(N
);
1291 Failure
: constant Boolean := False;
1292 Success
: constant Boolean := True;
1294 Index_Typ
: constant Entity_Id
:= Etype
(Index
);
1295 Index_Typ_Low
: constant Node_Id
:= Type_Low_Bound
(Index_Typ
);
1296 Index_Typ_High
: constant Node_Id
:= Type_High_Bound
(Index_Typ
);
1297 -- The type of the index corresponding to the array sub-aggregate along
1298 -- with its low and upper bounds.
1300 Index_Base
: constant Entity_Id
:= Base_Type
(Index_Typ
);
1301 Index_Base_Low
: constant Node_Id
:= Type_Low_Bound
(Index_Base
);
1302 Index_Base_High
: constant Node_Id
:= Type_High_Bound
(Index_Base
);
1303 -- Ditto for the base type
1305 Others_Present
: Boolean := False;
1307 Nb_Choices
: Nat
:= 0;
1308 -- Contains the overall number of named choices in this sub-aggregate
1310 function Add
(Val
: Uint
; To
: Node_Id
) return Node_Id
;
1311 -- Creates a new expression node where Val is added to expression To.
1312 -- Tries to constant fold whenever possible. To must be an already
1313 -- analyzed expression.
1315 procedure Check_Bound
(BH
: Node_Id
; AH
: in out Node_Id
);
1316 -- Checks that AH (the upper bound of an array aggregate) is less than
1317 -- or equal to BH (the upper bound of the index base type). If the check
1318 -- fails, a warning is emitted, the Raises_Constraint_Error flag of N is
1319 -- set, and AH is replaced with a duplicate of BH.
1321 procedure Check_Bounds
(L
, H
: Node_Id
; AL
, AH
: Node_Id
);
1322 -- Checks that range AL .. AH is compatible with range L .. H. Emits a
1323 -- warning if not and sets the Raises_Constraint_Error flag in N.
1325 procedure Check_Length
(L
, H
: Node_Id
; Len
: Uint
);
1326 -- Checks that range L .. H contains at least Len elements. Emits a
1327 -- warning if not and sets the Raises_Constraint_Error flag in N.
1329 function Dynamic_Or_Null_Range
(L
, H
: Node_Id
) return Boolean;
1330 -- Returns True if range L .. H is dynamic or null
1332 procedure Get
(Value
: out Uint
; From
: Node_Id
; OK
: out Boolean);
1333 -- Given expression node From, this routine sets OK to False if it
1334 -- cannot statically evaluate From. Otherwise it stores this static
1335 -- value into Value.
1337 function Resolve_Aggr_Expr
1339 Single_Elmt
: Boolean) return Boolean;
1340 -- Resolves aggregate expression Expr. Returns False if resolution
1341 -- fails. If Single_Elmt is set to False, the expression Expr may be
1342 -- used to initialize several array aggregate elements (this can happen
1343 -- for discrete choices such as "L .. H => Expr" or the OTHERS choice).
1344 -- In this event we do not resolve Expr unless expansion is disabled.
1345 -- To know why, see the DELAYED COMPONENT RESOLUTION note above.
1347 -- NOTE: In the case of "... => <>", we pass the N_Component_Association
1348 -- node as Expr, since there is no Expression and we need a Sloc for the
1351 procedure Resolve_Iterated_Component_Association
1353 Index_Typ
: Entity_Id
);
1356 procedure Warn_On_Null_Component_Association
(Expr
: Node_Id
);
1357 -- Expr is either a conditional expression or a case expression of an
1358 -- iterated component association initializing the aggregate N with
1359 -- components that can never be null. Report warning on associations
1360 -- that may initialize some component with a null value.
1366 function Add
(Val
: Uint
; To
: Node_Id
) return Node_Id
is
1372 if Raises_Constraint_Error
(To
) then
1376 -- First test if we can do constant folding
1378 if Compile_Time_Known_Value
(To
)
1379 or else Nkind
(To
) = N_Integer_Literal
1381 Expr_Pos
:= Make_Integer_Literal
(Loc
, Expr_Value
(To
) + Val
);
1382 Set_Is_Static_Expression
(Expr_Pos
);
1383 Set_Etype
(Expr_Pos
, Etype
(To
));
1384 Set_Analyzed
(Expr_Pos
, Analyzed
(To
));
1386 if not Is_Enumeration_Type
(Index_Typ
) then
1389 -- If we are dealing with enumeration return
1390 -- Index_Typ'Val (Expr_Pos)
1394 Make_Attribute_Reference
1396 Prefix
=> New_Occurrence_Of
(Index_Typ
, Loc
),
1397 Attribute_Name
=> Name_Val
,
1398 Expressions
=> New_List
(Expr_Pos
));
1404 -- If we are here no constant folding possible
1406 if not Is_Enumeration_Type
(Index_Base
) then
1409 Left_Opnd
=> Duplicate_Subexpr
(To
),
1410 Right_Opnd
=> Make_Integer_Literal
(Loc
, Val
));
1412 -- If we are dealing with enumeration return
1413 -- Index_Typ'Val (Index_Typ'Pos (To) + Val)
1417 Make_Attribute_Reference
1419 Prefix
=> New_Occurrence_Of
(Index_Typ
, Loc
),
1420 Attribute_Name
=> Name_Pos
,
1421 Expressions
=> New_List
(Duplicate_Subexpr
(To
)));
1425 Left_Opnd
=> To_Pos
,
1426 Right_Opnd
=> Make_Integer_Literal
(Loc
, Val
));
1429 Make_Attribute_Reference
1431 Prefix
=> New_Occurrence_Of
(Index_Typ
, Loc
),
1432 Attribute_Name
=> Name_Val
,
1433 Expressions
=> New_List
(Expr_Pos
));
1435 -- If the index type has a non standard representation, the
1436 -- attributes 'Val and 'Pos expand into function calls and the
1437 -- resulting expression is considered non-safe for reevaluation
1438 -- by the backend. Relocate it into a constant temporary in order
1439 -- to make it safe for reevaluation.
1441 if Has_Non_Standard_Rep
(Etype
(N
)) then
1446 Def_Id
:= Make_Temporary
(Loc
, 'R', Expr
);
1447 Set_Etype
(Def_Id
, Index_Typ
);
1449 Make_Object_Declaration
(Loc
,
1450 Defining_Identifier
=> Def_Id
,
1451 Object_Definition
=>
1452 New_Occurrence_Of
(Index_Typ
, Loc
),
1453 Constant_Present
=> True,
1454 Expression
=> Relocate_Node
(Expr
)));
1456 Expr
:= New_Occurrence_Of
(Def_Id
, Loc
);
1468 procedure Check_Bound
(BH
: Node_Id
; AH
: in out Node_Id
) is
1476 Get
(Value
=> Val_BH
, From
=> BH
, OK
=> OK_BH
);
1477 Get
(Value
=> Val_AH
, From
=> AH
, OK
=> OK_AH
);
1479 if OK_BH
and then OK_AH
and then Val_BH
< Val_AH
then
1480 Set_Raises_Constraint_Error
(N
);
1481 Error_Msg_Warn
:= SPARK_Mode
/= On
;
1482 Error_Msg_N
("upper bound out of range<<", AH
);
1483 Error_Msg_N
("\Constraint_Error [<<", AH
);
1485 -- You need to set AH to BH or else in the case of enumerations
1486 -- indexes we will not be able to resolve the aggregate bounds.
1488 AH
:= Duplicate_Subexpr
(BH
);
1496 procedure Check_Bounds
(L
, H
: Node_Id
; AL
, AH
: Node_Id
) is
1507 pragma Warnings
(Off
, OK_AL
);
1508 pragma Warnings
(Off
, OK_AH
);
1511 if Raises_Constraint_Error
(N
)
1512 or else Dynamic_Or_Null_Range
(AL
, AH
)
1517 Get
(Value
=> Val_L
, From
=> L
, OK
=> OK_L
);
1518 Get
(Value
=> Val_H
, From
=> H
, OK
=> OK_H
);
1520 Get
(Value
=> Val_AL
, From
=> AL
, OK
=> OK_AL
);
1521 Get
(Value
=> Val_AH
, From
=> AH
, OK
=> OK_AH
);
1523 if OK_L
and then Val_L
> Val_AL
then
1524 Set_Raises_Constraint_Error
(N
);
1525 Error_Msg_Warn
:= SPARK_Mode
/= On
;
1526 Error_Msg_N
("lower bound of aggregate out of range<<", N
);
1527 Error_Msg_N
("\Constraint_Error [<<", N
);
1530 if OK_H
and then Val_H
< Val_AH
then
1531 Set_Raises_Constraint_Error
(N
);
1532 Error_Msg_Warn
:= SPARK_Mode
/= On
;
1533 Error_Msg_N
("upper bound of aggregate out of range<<", N
);
1534 Error_Msg_N
("\Constraint_Error [<<", N
);
1542 procedure Check_Length
(L
, H
: Node_Id
; Len
: Uint
) is
1552 if Raises_Constraint_Error
(N
) then
1556 Get
(Value
=> Val_L
, From
=> L
, OK
=> OK_L
);
1557 Get
(Value
=> Val_H
, From
=> H
, OK
=> OK_H
);
1559 if not OK_L
or else not OK_H
then
1563 -- If null range length is zero
1565 if Val_L
> Val_H
then
1566 Range_Len
:= Uint_0
;
1568 Range_Len
:= Val_H
- Val_L
+ 1;
1571 if Range_Len
< Len
then
1572 Set_Raises_Constraint_Error
(N
);
1573 Error_Msg_Warn
:= SPARK_Mode
/= On
;
1574 Error_Msg_N
("too many elements<<", N
);
1575 Error_Msg_N
("\Constraint_Error [<<", N
);
1579 ---------------------------
1580 -- Dynamic_Or_Null_Range --
1581 ---------------------------
1583 function Dynamic_Or_Null_Range
(L
, H
: Node_Id
) return Boolean is
1591 Get
(Value
=> Val_L
, From
=> L
, OK
=> OK_L
);
1592 Get
(Value
=> Val_H
, From
=> H
, OK
=> OK_H
);
1594 return not OK_L
or else not OK_H
1595 or else not Is_OK_Static_Expression
(L
)
1596 or else not Is_OK_Static_Expression
(H
)
1597 or else Val_L
> Val_H
;
1598 end Dynamic_Or_Null_Range
;
1604 procedure Get
(Value
: out Uint
; From
: Node_Id
; OK
: out Boolean) is
1608 if Compile_Time_Known_Value
(From
) then
1609 Value
:= Expr_Value
(From
);
1611 -- If expression From is something like Some_Type'Val (10) then
1614 elsif Nkind
(From
) = N_Attribute_Reference
1615 and then Attribute_Name
(From
) = Name_Val
1616 and then Compile_Time_Known_Value
(First
(Expressions
(From
)))
1618 Value
:= Expr_Value
(First
(Expressions
(From
)));
1625 -----------------------
1626 -- Resolve_Aggr_Expr --
1627 -----------------------
1629 function Resolve_Aggr_Expr
1631 Single_Elmt
: Boolean) return Boolean
1633 Nxt_Ind
: constant Node_Id
:= Next_Index
(Index
);
1634 Nxt_Ind_Constr
: constant Node_Id
:= Next_Index
(Index_Constr
);
1635 -- Index is the current index corresponding to the expression
1637 Resolution_OK
: Boolean := True;
1638 -- Set to False if resolution of the expression failed
1641 -- Defend against previous errors
1643 if Nkind
(Expr
) = N_Error
1644 or else Error_Posted
(Expr
)
1649 -- If the array type against which we are resolving the aggregate
1650 -- has several dimensions, the expressions nested inside the
1651 -- aggregate must be further aggregates (or strings).
1653 if Present
(Nxt_Ind
) then
1654 if Nkind
(Expr
) /= N_Aggregate
then
1656 -- A string literal can appear where a one-dimensional array
1657 -- of characters is expected. If the literal looks like an
1658 -- operator, it is still an operator symbol, which will be
1659 -- transformed into a string when analyzed.
1661 if Is_Character_Type
(Component_Typ
)
1662 and then No
(Next_Index
(Nxt_Ind
))
1663 and then Nkind
(Expr
) in N_String_Literal | N_Operator_Symbol
1665 -- A string literal used in a multidimensional array
1666 -- aggregate in place of the final one-dimensional
1667 -- aggregate must not be enclosed in parentheses.
1669 if Paren_Count
(Expr
) /= 0 then
1670 Error_Msg_N
("no parenthesis allowed here", Expr
);
1673 Make_String_Into_Aggregate
(Expr
);
1676 Error_Msg_N
("nested array aggregate expected", Expr
);
1678 -- If the expression is parenthesized, this may be
1679 -- a missing component association for a 1-aggregate.
1681 if Paren_Count
(Expr
) > 0 then
1683 ("\if single-component aggregate is intended, "
1684 & "write e.g. (1 ='> ...)", Expr
);
1691 -- If it's "... => <>", nothing to resolve
1693 if Nkind
(Expr
) = N_Component_Association
then
1694 pragma Assert
(Box_Present
(Expr
));
1698 -- Ada 2005 (AI-231): Propagate the type to the nested aggregate.
1699 -- Required to check the null-exclusion attribute (if present).
1700 -- This value may be overridden later on.
1702 Set_Etype
(Expr
, Etype
(N
));
1704 Resolution_OK
:= Resolve_Array_Aggregate
1705 (Expr
, Nxt_Ind
, Nxt_Ind_Constr
, Component_Typ
, Others_Allowed
);
1708 -- If it's "... => <>", nothing to resolve
1710 if Nkind
(Expr
) = N_Component_Association
then
1711 pragma Assert
(Box_Present
(Expr
));
1715 -- Do not resolve the expressions of discrete or others choices
1716 -- unless the expression covers a single component, or the
1717 -- expander is inactive.
1719 -- In SPARK mode, expressions that can perform side effects will
1720 -- be recognized by the gnat2why back-end, and the whole
1721 -- subprogram will be ignored. So semantic analysis can be
1722 -- performed safely.
1725 or else not Expander_Active
1726 or else In_Spec_Expression
1728 Analyze_And_Resolve
(Expr
, Component_Typ
);
1729 Check_Expr_OK_In_Limited_Aggregate
(Expr
);
1730 Check_Non_Static_Context
(Expr
);
1731 Aggregate_Constraint_Checks
(Expr
, Component_Typ
);
1732 Check_Unset_Reference
(Expr
);
1736 -- If an aggregate component has a type with predicates, an explicit
1737 -- predicate check must be applied, as for an assignment statement,
1738 -- because the aggregate might not be expanded into individual
1739 -- component assignments. If the expression covers several components
1740 -- the analysis and the predicate check take place later.
1742 if Has_Predicates
(Component_Typ
)
1743 and then Analyzed
(Expr
)
1745 Apply_Predicate_Check
(Expr
, Component_Typ
);
1748 if Raises_Constraint_Error
(Expr
)
1749 and then Nkind
(Parent
(Expr
)) /= N_Component_Association
1751 Set_Raises_Constraint_Error
(N
);
1754 -- If the expression has been marked as requiring a range check,
1755 -- then generate it here. It's a bit odd to be generating such
1756 -- checks in the analyzer, but harmless since Generate_Range_Check
1757 -- does nothing (other than making sure Do_Range_Check is set) if
1758 -- the expander is not active.
1760 if Do_Range_Check
(Expr
) then
1761 Generate_Range_Check
(Expr
, Component_Typ
, CE_Range_Check_Failed
);
1764 return Resolution_OK
;
1765 end Resolve_Aggr_Expr
;
1767 --------------------------------------------
1768 -- Resolve_Iterated_Component_Association --
1769 --------------------------------------------
1771 procedure Resolve_Iterated_Component_Association
1773 Index_Typ
: Entity_Id
)
1775 Loc
: constant Source_Ptr
:= Sloc
(N
);
1776 Id
: constant Entity_Id
:= Defining_Identifier
(N
);
1778 -----------------------
1779 -- Remove_References --
1780 -----------------------
1782 function Remove_Reference
(N
: Node_Id
) return Traverse_Result
;
1783 -- Remove reference to the entity Id after analysis, so it can be
1784 -- properly reanalyzed after construct is expanded into a loop.
1786 function Remove_Reference
(N
: Node_Id
) return Traverse_Result
is
1788 if Nkind
(N
) = N_Identifier
1789 and then Present
(Entity
(N
))
1790 and then Entity
(N
) = Id
1792 Set_Entity
(N
, Empty
);
1793 Set_Etype
(N
, Empty
);
1795 Set_Analyzed
(N
, False);
1797 end Remove_Reference
;
1799 procedure Remove_References
is new Traverse_Proc
(Remove_Reference
);
1806 Expr
: constant Node_Id
:= Expression
(N
);
1808 -- Start of processing for Resolve_Iterated_Component_Association
1811 Error_Msg_Ada_2022_Feature
("iterated component", Loc
);
1813 -- Create a scope in which to introduce an index, to make it visible
1814 -- for the analysis of component expression.
1816 Scop
:= New_Internal_Entity
(E_Loop
, Current_Scope
, Loc
, 'L');
1817 Set_Etype
(Scop
, Standard_Void_Type
);
1818 Set_Parent
(Scop
, Parent
(N
));
1821 -- If there is iterator specification, then its preanalysis will make
1822 -- the index visible.
1824 if Present
(Iterator_Specification
(N
)) then
1825 Preanalyze
(Iterator_Specification
(N
));
1827 -- Otherwise, analyze discrete choices and make the index visible
1830 -- Insert index name into current scope but don't decorate it yet,
1831 -- so that a premature usage of this name in discrete choices will
1832 -- be nicely diagnosed.
1836 Choice
:= First
(Discrete_Choices
(N
));
1838 while Present
(Choice
) loop
1839 if Nkind
(Choice
) = N_Others_Choice
then
1840 Others_Present
:= True;
1845 -- Choice can be a subtype name, a range, or an expression
1847 if Is_Entity_Name
(Choice
)
1848 and then Is_Type
(Entity
(Choice
))
1850 Base_Type
(Entity
(Choice
)) = Base_Type
(Index_Typ
)
1855 Analyze_And_Resolve
(Choice
, Index_Typ
);
1862 -- Decorate the index variable
1864 Set_Etype
(Id
, Index_Typ
);
1865 Mutate_Ekind
(Id
, E_Variable
);
1866 Set_Is_Not_Self_Hidden
(Id
);
1867 Set_Scope
(Id
, Scop
);
1870 -- Analyze expression without expansion, to verify legality.
1871 -- When generating code, we then remove references to the index
1872 -- variable, because the expression will be analyzed anew after
1873 -- rewritting as a loop with a new index variable; when not
1874 -- generating code we leave the analyzed expression as it is.
1876 Dummy
:= Resolve_Aggr_Expr
(Expr
, Single_Elmt
=> False);
1878 if Operating_Mode
/= Check_Semantics
then
1879 Remove_References
(Expr
);
1882 -- An iterated_component_association may appear in a nested
1883 -- aggregate for a multidimensional structure: preserve the bounds
1884 -- computed for the expression, as well as the anonymous array
1885 -- type generated for it; both are needed during array expansion.
1887 if Nkind
(Expr
) = N_Aggregate
then
1888 Set_Aggregate_Bounds
(Expression
(N
), Aggregate_Bounds
(Expr
));
1889 Set_Etype
(Expression
(N
), Etype
(Expr
));
1893 end Resolve_Iterated_Component_Association
;
1895 ----------------------------------------
1896 -- Warn_On_Null_Component_Association --
1897 ----------------------------------------
1899 procedure Warn_On_Null_Component_Association
(Expr
: Node_Id
) is
1900 Comp_Typ
: constant Entity_Id
:= Component_Type
(Etype
(N
));
1902 procedure Check_Case_Expr
(N
: Node_Id
);
1903 -- Check if a case expression may initialize some component with a
1906 procedure Check_Cond_Expr
(N
: Node_Id
);
1907 -- Check if a conditional expression may initialize some component
1908 -- with a null value.
1910 procedure Check_Expr
(Expr
: Node_Id
);
1911 -- Check if an expression may initialize some component with a
1914 procedure Warn_On_Null_Expression_And_Rewrite
(Null_Expr
: Node_Id
);
1915 -- Report warning on known null expression and replace the expression
1916 -- by a raise constraint error node.
1918 ---------------------
1919 -- Check_Case_Expr --
1920 ---------------------
1922 procedure Check_Case_Expr
(N
: Node_Id
) is
1923 Alt_Node
: Node_Id
:= First
(Alternatives
(N
));
1926 while Present
(Alt_Node
) loop
1927 Check_Expr
(Expression
(Alt_Node
));
1930 end Check_Case_Expr
;
1932 ---------------------
1933 -- Check_Cond_Expr --
1934 ---------------------
1936 procedure Check_Cond_Expr
(N
: Node_Id
) is
1937 If_Expr
: Node_Id
:= N
;
1938 Then_Expr
: Node_Id
;
1939 Else_Expr
: Node_Id
;
1942 Then_Expr
:= Next
(First
(Expressions
(If_Expr
)));
1943 Else_Expr
:= Next
(Then_Expr
);
1945 Check_Expr
(Then_Expr
);
1947 -- Process elsif parts (if any)
1949 while Nkind
(Else_Expr
) = N_If_Expression
loop
1950 If_Expr
:= Else_Expr
;
1951 Then_Expr
:= Next
(First
(Expressions
(If_Expr
)));
1952 Else_Expr
:= Next
(Then_Expr
);
1954 Check_Expr
(Then_Expr
);
1957 if Known_Null
(Else_Expr
) then
1958 Warn_On_Null_Expression_And_Rewrite
(Else_Expr
);
1960 end Check_Cond_Expr
;
1966 procedure Check_Expr
(Expr
: Node_Id
) is
1968 if Known_Null
(Expr
) then
1969 Warn_On_Null_Expression_And_Rewrite
(Expr
);
1971 elsif Nkind
(Expr
) = N_If_Expression
then
1972 Check_Cond_Expr
(Expr
);
1974 elsif Nkind
(Expr
) = N_Case_Expression
then
1975 Check_Case_Expr
(Expr
);
1979 -----------------------------------------
1980 -- Warn_On_Null_Expression_And_Rewrite --
1981 -----------------------------------------
1983 procedure Warn_On_Null_Expression_And_Rewrite
(Null_Expr
: Node_Id
) is
1986 ("(Ada 2005) NULL not allowed in null-excluding component??",
1989 ("\Constraint_Error might be raised at run time??", Null_Expr
);
1991 -- We cannot use Apply_Compile_Time_Constraint_Error because in
1992 -- some cases the components are rewritten and the runtime error
1996 Make_Raise_Constraint_Error
(Sloc
(Null_Expr
),
1997 Reason
=> CE_Access_Check_Failed
));
1999 Set_Etype
(Null_Expr
, Comp_Typ
);
2000 Set_Analyzed
(Null_Expr
);
2001 end Warn_On_Null_Expression_And_Rewrite
;
2003 -- Start of processing for Warn_On_Null_Component_Association
2006 pragma Assert
(Can_Never_Be_Null
(Comp_Typ
));
2008 case Nkind
(Expr
) is
2009 when N_If_Expression
=>
2010 Check_Cond_Expr
(Expr
);
2012 when N_Case_Expression
=>
2013 Check_Case_Expr
(Expr
);
2016 pragma Assert
(False);
2019 end Warn_On_Null_Component_Association
;
2028 Aggr_Low
: Node_Id
:= Empty
;
2029 Aggr_High
: Node_Id
:= Empty
;
2030 -- The actual low and high bounds of this sub-aggregate
2032 Case_Table_Size
: Nat
;
2033 -- Contains the size of the case table needed to sort aggregate choices
2035 Choices_Low
: Node_Id
:= Empty
;
2036 Choices_High
: Node_Id
:= Empty
;
2037 -- The lowest and highest discrete choices values for a named aggregate
2039 Delete_Choice
: Boolean;
2040 -- Used when replacing a subtype choice with predicate by a list
2042 Has_Iterator_Specifications
: Boolean := False;
2043 -- Flag to indicate that all named associations are iterated component
2044 -- associations with iterator specifications, in which case the
2045 -- expansion will create two loops: one to evaluate the size and one
2046 -- to generate the elements (4.3.3 (20.2/5)).
2048 Nb_Elements
: Uint
:= Uint_0
;
2049 -- The number of elements in a positional aggregate
2051 Nb_Discrete_Choices
: Nat
:= 0;
2052 -- The overall number of discrete choices (not counting others choice)
2054 -- Start of processing for Resolve_Array_Aggregate
2057 -- Ignore junk empty aggregate resulting from parser error
2059 if No
(Expressions
(N
))
2060 and then No
(Component_Associations
(N
))
2061 and then not Null_Record_Present
(N
)
2066 -- Disable the warning for GNAT Mode to allow for easier transition.
2068 if Ada_Version_Explicit
>= Ada_2022
2069 and then Warn_On_Obsolescent_Feature
2070 and then not GNAT_Mode
2071 and then not Is_Homogeneous_Aggregate
(N
)
2072 and then not Is_Enum_Array_Aggregate
(N
)
2073 and then Is_Parenthesis_Aggregate
(N
)
2074 and then Nkind
(Parent
(N
)) /= N_Qualified_Expression
2075 and then Comes_From_Source
(N
)
2078 ("?j?array aggregate using () is an" &
2079 " obsolescent syntax, use '['] instead", N
);
2082 -- STEP 1: make sure the aggregate is correctly formatted
2084 if Is_Null_Aggregate
(N
) then
2087 elsif Present
(Component_Associations
(N
)) then
2089 -- Verify that all or none of the component associations
2090 -- include an iterator specification.
2092 Assoc
:= First
(Component_Associations
(N
));
2093 if Nkind
(Assoc
) = N_Iterated_Component_Association
2094 and then Present
(Iterator_Specification
(Assoc
))
2096 -- All other component associations must have an iterator spec.
2099 while Present
(Assoc
) loop
2100 if Nkind
(Assoc
) /= N_Iterated_Component_Association
2101 or else No
(Iterator_Specification
(Assoc
))
2103 Error_Msg_N
("mixed iterated component association"
2104 & " (RM 4.3.3 (17.1/5))",
2112 Has_Iterator_Specifications
:= True;
2115 -- or none of them do.
2118 while Present
(Assoc
) loop
2119 if Nkind
(Assoc
) = N_Iterated_Component_Association
2120 and then Present
(Iterator_Specification
(Assoc
))
2122 Error_Msg_N
("mixed iterated component association"
2123 & " (RM 4.3.3 (17.1/5))",
2133 Assoc
:= First
(Component_Associations
(N
));
2134 while Present
(Assoc
) loop
2135 if Nkind
(Assoc
) = N_Iterated_Component_Association
then
2136 Resolve_Iterated_Component_Association
(Assoc
, Index_Typ
);
2138 elsif Nkind
(Assoc
) /= N_Component_Association
then
2140 ("invalid component association for aggregate", Assoc
);
2144 Choice
:= First
(Choice_List
(Assoc
));
2145 Delete_Choice
:= False;
2146 while Present
(Choice
) loop
2147 if Nkind
(Choice
) = N_Others_Choice
then
2148 Others_Present
:= True;
2150 if Choice
/= First
(Choice_List
(Assoc
))
2151 or else Present
(Next
(Choice
))
2154 ("OTHERS must appear alone in a choice list", Choice
);
2158 if Present
(Next
(Assoc
)) then
2160 ("OTHERS must appear last in an aggregate", Choice
);
2164 if Ada_Version
= Ada_83
2165 and then Assoc
/= First
(Component_Associations
(N
))
2166 and then Nkind
(Parent
(N
)) in
2167 N_Assignment_Statement | N_Object_Declaration
2170 ("(Ada 83) illegal context for OTHERS choice", N
);
2173 elsif Is_Entity_Name
(Choice
) then
2177 E
: constant Entity_Id
:= Entity
(Choice
);
2183 if Is_Type
(E
) and then Has_Predicates
(E
) then
2184 Freeze_Before
(N
, E
);
2186 if Has_Dynamic_Predicate_Aspect
(E
)
2187 or else Has_Ghost_Predicate_Aspect
(E
)
2190 ("subtype& has non-static predicate, not allowed "
2191 & "in aggregate choice", Choice
, E
);
2193 elsif not Is_OK_Static_Subtype
(E
) then
2195 ("non-static subtype& has predicate, not allowed "
2196 & "in aggregate choice", Choice
, E
);
2199 -- If the subtype has a static predicate, replace the
2200 -- original choice with the list of individual values
2201 -- covered by the predicate.
2202 -- This should be deferred to expansion time ???
2204 if Present
(Static_Discrete_Predicate
(E
)) then
2205 Delete_Choice
:= True;
2208 P
:= First
(Static_Discrete_Predicate
(E
));
2209 while Present
(P
) loop
2211 Set_Sloc
(C
, Sloc
(Choice
));
2212 Append_To
(New_Cs
, C
);
2216 Insert_List_After
(Choice
, New_Cs
);
2222 Nb_Choices
:= Nb_Choices
+ 1;
2225 C
: constant Node_Id
:= Choice
;
2230 if Delete_Choice
then
2232 Nb_Choices
:= Nb_Choices
- 1;
2233 Delete_Choice
:= False;
2242 -- At this point we know that the others choice, if present, is by
2243 -- itself and appears last in the aggregate. Check if we have mixed
2244 -- positional and discrete associations (other than the others choice).
2246 if Present
(Expressions
(N
))
2247 and then (Nb_Choices
> 1
2248 or else (Nb_Choices
= 1 and then not Others_Present
))
2251 ("cannot mix named and positional associations in array aggregate",
2252 First
(Choice_List
(First
(Component_Associations
(N
)))));
2256 -- Test for the validity of an others choice if present
2258 if Others_Present
and then not Others_Allowed
then
2260 Others_N
: constant Node_Id
:=
2261 First
(Choice_List
(First
(Component_Associations
(N
))));
2263 Error_Msg_N
("OTHERS choice not allowed here", Others_N
);
2264 Error_Msg_N
("\qualify the aggregate with a constrained subtype "
2265 & "to provide bounds for it", Others_N
);
2270 -- Protect against cascaded errors
2272 if Etype
(Index_Typ
) = Any_Type
then
2276 -- STEP 2: Process named components
2278 if No
(Expressions
(N
)) then
2279 if Others_Present
then
2280 Case_Table_Size
:= Nb_Choices
- 1;
2282 Case_Table_Size
:= Nb_Choices
;
2286 function Empty_Range
(A
: Node_Id
) return Boolean;
2287 -- If an association covers an empty range, some warnings on the
2288 -- expression of the association can be disabled.
2294 function Empty_Range
(A
: Node_Id
) return Boolean is
2298 if Nkind
(A
) = N_Iterated_Component_Association
then
2299 R
:= First
(Discrete_Choices
(A
));
2301 R
:= First
(Choices
(A
));
2304 return No
(Next
(R
))
2305 and then Nkind
(R
) = N_Range
2306 and then Compile_Time_Compare
2307 (Low_Bound
(R
), High_Bound
(R
), False) = GT
;
2314 -- Denote the lowest and highest values in an aggregate choice
2316 S_Low
: Node_Id
:= Empty
;
2317 S_High
: Node_Id
:= Empty
;
2318 -- if a choice in an aggregate is a subtype indication these
2319 -- denote the lowest and highest values of the subtype
2321 Table
: Case_Table_Type
(1 .. Case_Table_Size
);
2322 -- Used to sort all the different choice values
2324 Single_Choice
: Boolean;
2325 -- Set to true every time there is a single discrete choice in a
2326 -- discrete association
2328 Prev_Nb_Discrete_Choices
: Nat
;
2329 -- Used to keep track of the number of discrete choices in the
2330 -- current association.
2332 Errors_Posted_On_Choices
: Boolean := False;
2333 -- Keeps track of whether any choices have semantic errors
2335 -- Start of processing for Step_2
2338 -- STEP 2 (A): Check discrete choices validity
2339 -- No need if this is an element iteration.
2341 Assoc
:= First
(Component_Associations
(N
));
2342 while Present
(Assoc
)
2343 and then Present
(Choice_List
(Assoc
))
2345 Prev_Nb_Discrete_Choices
:= Nb_Discrete_Choices
;
2346 Choice
:= First
(Choice_List
(Assoc
));
2351 if Nkind
(Choice
) = N_Others_Choice
then
2352 Single_Choice
:= False;
2355 -- Test for subtype mark without constraint
2357 elsif Is_Entity_Name
(Choice
) and then
2358 Is_Type
(Entity
(Choice
))
2360 if Base_Type
(Entity
(Choice
)) /= Index_Base
then
2362 ("invalid subtype mark in aggregate choice",
2367 -- Case of subtype indication
2369 elsif Nkind
(Choice
) = N_Subtype_Indication
then
2370 Resolve_Discrete_Subtype_Indication
(Choice
, Index_Base
);
2372 if Has_Dynamic_Predicate_Aspect
2373 (Entity
(Subtype_Mark
(Choice
)))
2374 or else Has_Ghost_Predicate_Aspect
2375 (Entity
(Subtype_Mark
(Choice
)))
2378 ("subtype& has non-static predicate, "
2379 & "not allowed in aggregate choice",
2380 Choice
, Entity
(Subtype_Mark
(Choice
)));
2383 -- Does the subtype indication evaluation raise CE?
2385 Get_Index_Bounds
(Subtype_Mark
(Choice
), S_Low
, S_High
);
2386 Get_Index_Bounds
(Choice
, Low
, High
);
2387 Check_Bounds
(S_Low
, S_High
, Low
, High
);
2389 -- Case of range or expression
2392 Resolve
(Choice
, Index_Base
);
2393 Check_Unset_Reference
(Choice
);
2394 Check_Non_Static_Context
(Choice
);
2396 -- If semantic errors were posted on the choice, then
2397 -- record that for possible early return from later
2398 -- processing (see handling of enumeration choices).
2400 if Error_Posted
(Choice
) then
2401 Errors_Posted_On_Choices
:= True;
2404 -- Do not range check a choice. This check is redundant
2405 -- since this test is already done when we check that the
2406 -- bounds of the array aggregate are within range.
2408 Set_Do_Range_Check
(Choice
, False);
2411 -- If we could not resolve the discrete choice stop here
2413 if Etype
(Choice
) = Any_Type
then
2416 -- If the discrete choice raises CE get its original bounds
2418 elsif Nkind
(Choice
) = N_Raise_Constraint_Error
then
2419 Set_Raises_Constraint_Error
(N
);
2420 Get_Index_Bounds
(Original_Node
(Choice
), Low
, High
);
2422 -- Otherwise get its bounds as usual
2425 Get_Index_Bounds
(Choice
, Low
, High
);
2428 if (Dynamic_Or_Null_Range
(Low
, High
)
2429 or else (Nkind
(Choice
) = N_Subtype_Indication
2431 Dynamic_Or_Null_Range
(S_Low
, S_High
)))
2432 and then Nb_Choices
/= 1
2435 ("dynamic or empty choice in aggregate "
2436 & "must be the only choice", Choice
);
2440 if not (All_Composite_Constraints_Static
(Low
)
2441 and then All_Composite_Constraints_Static
(High
)
2442 and then All_Composite_Constraints_Static
(S_Low
)
2443 and then All_Composite_Constraints_Static
(S_High
))
2445 Check_Restriction
(No_Dynamic_Sized_Objects
, Choice
);
2448 Nb_Discrete_Choices
:= Nb_Discrete_Choices
+ 1;
2449 Table
(Nb_Discrete_Choices
).Lo
:= Low
;
2450 Table
(Nb_Discrete_Choices
).Hi
:= High
;
2451 Table
(Nb_Discrete_Choices
).Choice
:= Choice
;
2457 -- Check if we have a single discrete choice and whether
2458 -- this discrete choice specifies a single value.
2461 Nb_Discrete_Choices
= Prev_Nb_Discrete_Choices
+ 1
2462 and then Low
= High
;
2468 -- Ada 2005 (AI-231)
2470 if Ada_Version
>= Ada_2005
2471 and then not Empty_Range
(Assoc
)
2473 if Known_Null
(Expression
(Assoc
)) then
2474 Check_Can_Never_Be_Null
(Etype
(N
), Expression
(Assoc
));
2476 -- Report warning on iterated component association that may
2477 -- initialize some component of an array of null-excluding
2478 -- access type components with a null value. For example:
2480 -- type AList is array (...) of not null access Integer;
2482 -- [for J in A'Range =>
2483 -- (if Func (J) = 0 then A(J)'Access else Null)];
2485 elsif Ada_Version
>= Ada_2022
2486 and then Can_Never_Be_Null
(Component_Type
(Etype
(N
)))
2487 and then Nkind
(Assoc
) = N_Iterated_Component_Association
2488 and then Nkind
(Expression
(Assoc
)) in N_If_Expression
2491 Warn_On_Null_Component_Association
(Expression
(Assoc
));
2495 -- Ada 2005 (AI-287): In case of default initialized component
2496 -- we delay the resolution to the expansion phase.
2498 if Box_Present
(Assoc
) then
2500 -- Ada 2005 (AI-287): In case of default initialization of a
2501 -- component the expander will generate calls to the
2502 -- corresponding initialization subprogram. We need to call
2503 -- Resolve_Aggr_Expr to check the rules about
2506 if not Resolve_Aggr_Expr
2507 (Assoc
, Single_Elmt
=> Single_Choice
)
2512 -- ??? Checks for dynamically tagged expressions below will
2513 -- be only applied to iterated_component_association after
2514 -- expansion; in particular, errors might not be reported when
2515 -- -gnatc switch is used.
2517 elsif Nkind
(Assoc
) = N_Iterated_Component_Association
then
2518 null; -- handled above, in a loop context
2520 elsif not Resolve_Aggr_Expr
2521 (Expression
(Assoc
), Single_Elmt
=> Single_Choice
)
2525 -- Check incorrect use of dynamically tagged expression
2527 -- We differentiate here two cases because the expression may
2528 -- not be decorated. For example, the analysis and resolution
2529 -- of the expression associated with the others choice will be
2530 -- done later with the full aggregate. In such case we
2531 -- duplicate the expression tree to analyze the copy and
2532 -- perform the required check.
2534 elsif No
(Etype
(Expression
(Assoc
))) then
2536 Save_Analysis
: constant Boolean := Full_Analysis
;
2537 Expr
: constant Node_Id
:=
2538 New_Copy_Tree
(Expression
(Assoc
));
2541 Expander_Mode_Save_And_Set
(False);
2542 Full_Analysis
:= False;
2544 -- Analyze the expression, making sure it is properly
2545 -- attached to the tree before we do the analysis.
2547 Set_Parent
(Expr
, Parent
(Expression
(Assoc
)));
2550 -- Compute its dimensions now, rather than at the end of
2551 -- resolution, because in the case of multidimensional
2552 -- aggregates subsequent expansion may lead to spurious
2555 Check_Expression_Dimensions
(Expr
, Component_Typ
);
2557 -- If the expression is a literal, propagate this info
2558 -- to the expression in the association, to enable some
2559 -- optimizations downstream.
2561 if Is_Entity_Name
(Expr
)
2562 and then Present
(Entity
(Expr
))
2563 and then Ekind
(Entity
(Expr
)) = E_Enumeration_Literal
2566 (Expression
(Assoc
), Component_Typ
);
2569 Full_Analysis
:= Save_Analysis
;
2570 Expander_Mode_Restore
;
2572 if Is_Tagged_Type
(Etype
(Expr
)) then
2573 Check_Dynamically_Tagged_Expression
2575 Typ
=> Component_Type
(Etype
(N
)),
2580 elsif Is_Tagged_Type
(Etype
(Expression
(Assoc
))) then
2581 Check_Dynamically_Tagged_Expression
2582 (Expr
=> Expression
(Assoc
),
2583 Typ
=> Component_Type
(Etype
(N
)),
2590 -- If aggregate contains more than one choice then these must be
2591 -- static. Check for duplicate and missing values.
2593 -- Note: there is duplicated code here wrt Check_Choice_Set in
2594 -- the body of Sem_Case, and it is possible we could just reuse
2595 -- that procedure. To be checked ???
2597 if Nb_Discrete_Choices
> 1 then
2598 Check_Choices
: declare
2600 -- Location of choice for messages
2604 -- High end of one range and Low end of the next. Should be
2605 -- contiguous if there is no hole in the list of values.
2609 -- End points of duplicated range
2611 Missing_Or_Duplicates
: Boolean := False;
2612 -- Set True if missing or duplicate choices found
2614 procedure Output_Bad_Choices
(Lo
, Hi
: Uint
; C
: Node_Id
);
2615 -- Output continuation message with a representation of the
2616 -- bounds (just Lo if Lo = Hi, else Lo .. Hi). C is the
2617 -- choice node where the message is to be posted.
2619 ------------------------
2620 -- Output_Bad_Choices --
2621 ------------------------
2623 procedure Output_Bad_Choices
(Lo
, Hi
: Uint
; C
: Node_Id
) is
2625 -- Enumeration type case
2627 if Is_Enumeration_Type
(Index_Typ
) then
2629 Chars
(Get_Enum_Lit_From_Pos
(Index_Typ
, Lo
, Loc
));
2631 Chars
(Get_Enum_Lit_From_Pos
(Index_Typ
, Hi
, Loc
));
2634 Error_Msg_N
("\\ %!", C
);
2636 Error_Msg_N
("\\ % .. %!", C
);
2639 -- Integer types case
2642 Error_Msg_Uint_1
:= Lo
;
2643 Error_Msg_Uint_2
:= Hi
;
2646 Error_Msg_N
("\\ ^!", C
);
2648 Error_Msg_N
("\\ ^ .. ^!", C
);
2651 end Output_Bad_Choices
;
2653 -- Start of processing for Check_Choices
2656 Sort_Case_Table
(Table
);
2658 -- First we do a quick linear loop to find out if we have
2659 -- any duplicates or missing entries (usually we have a
2660 -- legal aggregate, so this will get us out quickly).
2662 for J
in 1 .. Nb_Discrete_Choices
- 1 loop
2663 Hi_Val
:= Expr_Value
(Table
(J
).Hi
);
2664 Lo_Val
:= Expr_Value
(Table
(J
+ 1).Lo
);
2667 or else (Lo_Val
> Hi_Val
+ 1
2668 and then not Others_Present
)
2670 Missing_Or_Duplicates
:= True;
2675 -- If we have missing or duplicate entries, first fill in
2676 -- the Highest entries to make life easier in the following
2677 -- loops to detect bad entries.
2679 if Missing_Or_Duplicates
then
2680 Table
(1).Highest
:= Expr_Value
(Table
(1).Hi
);
2682 for J
in 2 .. Nb_Discrete_Choices
loop
2683 Table
(J
).Highest
:=
2685 (Table
(J
- 1).Highest
, Expr_Value
(Table
(J
).Hi
));
2688 -- Loop through table entries to find duplicate indexes
2690 for J
in 2 .. Nb_Discrete_Choices
loop
2691 Lo_Val
:= Expr_Value
(Table
(J
).Lo
);
2692 Hi_Val
:= Expr_Value
(Table
(J
).Hi
);
2694 -- Case where we have duplicates (the lower bound of
2695 -- this choice is less than or equal to the highest
2696 -- high bound found so far).
2698 if Lo_Val
<= Table
(J
- 1).Highest
then
2700 -- We move backwards looking for duplicates. We can
2701 -- abandon this loop as soon as we reach a choice
2702 -- highest value that is less than Lo_Val.
2704 for K
in reverse 1 .. J
- 1 loop
2705 exit when Table
(K
).Highest
< Lo_Val
;
2707 -- Here we may have duplicates between entries
2708 -- for K and J. Get range of duplicates.
2711 UI_Max
(Lo_Val
, Expr_Value
(Table
(K
).Lo
));
2713 UI_Min
(Hi_Val
, Expr_Value
(Table
(K
).Hi
));
2715 -- Nothing to do if duplicate range is null
2717 if Lo_Dup
> Hi_Dup
then
2720 -- Otherwise place proper message
2723 -- We place message on later choice, with a
2724 -- line reference to the earlier choice.
2726 if Sloc
(Table
(J
).Choice
) <
2727 Sloc
(Table
(K
).Choice
)
2729 Choice
:= Table
(K
).Choice
;
2730 Error_Msg_Sloc
:= Sloc
(Table
(J
).Choice
);
2732 Choice
:= Table
(J
).Choice
;
2733 Error_Msg_Sloc
:= Sloc
(Table
(K
).Choice
);
2736 if Lo_Dup
= Hi_Dup
then
2738 ("index value in array aggregate "
2739 & "duplicates the one given#!", Choice
);
2742 ("index values in array aggregate "
2743 & "duplicate those given#!", Choice
);
2746 Output_Bad_Choices
(Lo_Dup
, Hi_Dup
, Choice
);
2752 -- Loop through entries in table to find missing indexes.
2753 -- Not needed if others, since missing impossible.
2755 if not Others_Present
then
2756 for J
in 2 .. Nb_Discrete_Choices
loop
2757 Lo_Val
:= Expr_Value
(Table
(J
).Lo
);
2758 Hi_Val
:= Table
(J
- 1).Highest
;
2760 if Lo_Val
> Hi_Val
+ 1 then
2763 Error_Node
: Node_Id
;
2766 -- If the choice is the bound of a range in
2767 -- a subtype indication, it is not in the
2768 -- source lists for the aggregate itself, so
2769 -- post the error on the aggregate. Otherwise
2770 -- post it on choice itself.
2772 Choice
:= Table
(J
).Choice
;
2774 if Is_List_Member
(Choice
) then
2775 Error_Node
:= Choice
;
2780 if Hi_Val
+ 1 = Lo_Val
- 1 then
2782 ("missing index value "
2783 & "in array aggregate!", Error_Node
);
2786 ("missing index values "
2787 & "in array aggregate!", Error_Node
);
2791 (Hi_Val
+ 1, Lo_Val
- 1, Error_Node
);
2797 -- If either missing or duplicate values, return failure
2799 Set_Etype
(N
, Any_Composite
);
2805 if Has_Iterator_Specifications
then
2806 -- Bounds will be determined dynamically.
2811 -- STEP 2 (B): Compute aggregate bounds and min/max choices values
2813 if Nb_Discrete_Choices
> 0 then
2814 Choices_Low
:= Table
(1).Lo
;
2815 Choices_High
:= Table
(Nb_Discrete_Choices
).Hi
;
2818 -- If Others is present, then bounds of aggregate come from the
2819 -- index constraint (not the choices in the aggregate itself).
2821 if Others_Present
then
2822 Get_Index_Bounds
(Index_Constr
, Aggr_Low
, Aggr_High
);
2824 -- Abandon processing if either bound is already signalled as
2825 -- an error (prevents junk cascaded messages and blow ups).
2827 if Nkind
(Aggr_Low
) = N_Error
2829 Nkind
(Aggr_High
) = N_Error
2834 -- No others clause present
2837 -- Special processing if others allowed and not present. This
2838 -- means that the bounds of the aggregate come from the index
2839 -- constraint (and the length must match).
2841 if Others_Allowed
then
2842 Get_Index_Bounds
(Index_Constr
, Aggr_Low
, Aggr_High
);
2844 -- Abandon processing if either bound is already signalled
2845 -- as an error (stop junk cascaded messages and blow ups).
2847 if Nkind
(Aggr_Low
) = N_Error
2849 Nkind
(Aggr_High
) = N_Error
2854 -- If others allowed, and no others present, then the array
2855 -- should cover all index values. If it does not, we will
2856 -- get a length check warning, but there is two cases where
2857 -- an additional warning is useful:
2859 -- If we have no positional components, and the length is
2860 -- wrong (which we can tell by others being allowed with
2861 -- missing components), and the index type is an enumeration
2862 -- type, then issue appropriate warnings about these missing
2863 -- components. They are only warnings, since the aggregate
2864 -- is fine, it's just the wrong length. We skip this check
2865 -- for standard character types (since there are no literals
2866 -- and it is too much trouble to concoct them), and also if
2867 -- any of the bounds have values that are not known at
2870 -- Another case warranting a warning is when the length
2871 -- is right, but as above we have an index type that is
2872 -- an enumeration, and the bounds do not match. This is a
2873 -- case where dubious sliding is allowed and we generate a
2874 -- warning that the bounds do not match.
2876 if No
(Expressions
(N
))
2877 and then Nkind
(Index
) = N_Range
2878 and then Is_Enumeration_Type
(Etype
(Index
))
2879 and then not Is_Standard_Character_Type
(Etype
(Index
))
2880 and then Compile_Time_Known_Value
(Aggr_Low
)
2881 and then Compile_Time_Known_Value
(Aggr_High
)
2882 and then Compile_Time_Known_Value
(Choices_Low
)
2883 and then Compile_Time_Known_Value
(Choices_High
)
2885 -- If any of the expressions or range bounds in choices
2886 -- have semantic errors, then do not attempt further
2887 -- resolution, to prevent cascaded errors.
2889 if Errors_Posted_On_Choices
then
2894 ALo
: constant Node_Id
:= Expr_Value_E
(Aggr_Low
);
2895 AHi
: constant Node_Id
:= Expr_Value_E
(Aggr_High
);
2896 CLo
: constant Node_Id
:= Expr_Value_E
(Choices_Low
);
2897 CHi
: constant Node_Id
:= Expr_Value_E
(Choices_High
);
2902 -- Warning case 1, missing values at start/end. Only
2903 -- do the check if the number of entries is too small.
2905 if (Enumeration_Pos
(CHi
) - Enumeration_Pos
(CLo
))
2907 (Enumeration_Pos
(AHi
) - Enumeration_Pos
(ALo
))
2910 ("missing index value(s) in array aggregate??",
2913 -- Output missing value(s) at start
2915 if Chars
(ALo
) /= Chars
(CLo
) then
2918 if Chars
(ALo
) = Chars
(Ent
) then
2919 Error_Msg_Name_1
:= Chars
(ALo
);
2920 Error_Msg_N
("\ %??", N
);
2922 Error_Msg_Name_1
:= Chars
(ALo
);
2923 Error_Msg_Name_2
:= Chars
(Ent
);
2924 Error_Msg_N
("\ % .. %??", N
);
2928 -- Output missing value(s) at end
2930 if Chars
(AHi
) /= Chars
(CHi
) then
2933 if Chars
(AHi
) = Chars
(Ent
) then
2934 Error_Msg_Name_1
:= Chars
(Ent
);
2935 Error_Msg_N
("\ %??", N
);
2937 Error_Msg_Name_1
:= Chars
(Ent
);
2938 Error_Msg_Name_2
:= Chars
(AHi
);
2939 Error_Msg_N
("\ % .. %??", N
);
2943 -- Warning case 2, dubious sliding. The First_Subtype
2944 -- test distinguishes between a constrained type where
2945 -- sliding is not allowed (so we will get a warning
2946 -- later that Constraint_Error will be raised), and
2947 -- the unconstrained case where sliding is permitted.
2949 elsif (Enumeration_Pos
(CHi
) - Enumeration_Pos
(CLo
))
2951 (Enumeration_Pos
(AHi
) - Enumeration_Pos
(ALo
))
2952 and then Chars
(ALo
) /= Chars
(CLo
)
2954 not Is_Constrained
(First_Subtype
(Etype
(N
)))
2957 ("bounds of aggregate do not match target??", N
);
2963 -- If no others, aggregate bounds come from aggregate
2965 Aggr_Low
:= Choices_Low
;
2966 Aggr_High
:= Choices_High
;
2970 -- STEP 3: Process positional components
2973 -- STEP 3 (A): Process positional elements
2975 Expr
:= First
(Expressions
(N
));
2976 Nb_Elements
:= Uint_0
;
2977 while Present
(Expr
) loop
2978 Nb_Elements
:= Nb_Elements
+ 1;
2980 -- Ada 2005 (AI-231)
2982 if Ada_Version
>= Ada_2005
and then Known_Null
(Expr
) then
2983 Check_Can_Never_Be_Null
(Etype
(N
), Expr
);
2986 if not Resolve_Aggr_Expr
(Expr
, Single_Elmt
=> True) then
2990 -- Check incorrect use of dynamically tagged expression
2992 if Is_Tagged_Type
(Etype
(Expr
)) then
2993 Check_Dynamically_Tagged_Expression
2995 Typ
=> Component_Type
(Etype
(N
)),
3002 if Others_Present
then
3003 Assoc
:= Last
(Component_Associations
(N
));
3005 -- Ada 2005 (AI-231)
3007 if Ada_Version
>= Ada_2005
and then Known_Null
(Assoc
) then
3008 Check_Can_Never_Be_Null
(Etype
(N
), Expression
(Assoc
));
3011 -- Ada 2005 (AI-287): In case of default initialized component,
3012 -- we delay the resolution to the expansion phase.
3014 if Box_Present
(Assoc
) then
3016 -- Ada 2005 (AI-287): In case of default initialization of a
3017 -- component the expander will generate calls to the
3018 -- corresponding initialization subprogram. We need to call
3019 -- Resolve_Aggr_Expr to check the rules about
3022 if not Resolve_Aggr_Expr
(Assoc
, Single_Elmt
=> False) then
3026 elsif not Resolve_Aggr_Expr
(Expression
(Assoc
),
3027 Single_Elmt
=> False)
3031 -- Check incorrect use of dynamically tagged expression. The
3032 -- expression of the others choice has not been resolved yet.
3033 -- In order to diagnose the semantic error we create a duplicate
3034 -- tree to analyze it and perform the check.
3036 elsif Nkind
(Assoc
) /= N_Iterated_Component_Association
then
3038 Save_Analysis
: constant Boolean := Full_Analysis
;
3039 Expr
: constant Node_Id
:=
3040 New_Copy_Tree
(Expression
(Assoc
));
3043 Expander_Mode_Save_And_Set
(False);
3044 Full_Analysis
:= False;
3046 Full_Analysis
:= Save_Analysis
;
3047 Expander_Mode_Restore
;
3049 if Is_Tagged_Type
(Etype
(Expr
)) then
3050 Check_Dynamically_Tagged_Expression
3052 Typ
=> Component_Type
(Etype
(N
)),
3059 -- STEP 3 (B): Compute the aggregate bounds
3061 if Others_Present
then
3062 Get_Index_Bounds
(Index_Constr
, Aggr_Low
, Aggr_High
);
3065 if Others_Allowed
then
3066 Get_Index_Bounds
(Index_Constr
, Aggr_Low
, Discard
);
3068 Aggr_Low
:= Index_Typ_Low
;
3071 Aggr_High
:= Add
(Nb_Elements
- 1, To
=> Aggr_Low
);
3072 Check_Bound
(Index_Base_High
, Aggr_High
);
3076 -- STEP 4: Perform static aggregate checks and save the bounds
3080 Check_Bounds
(Index_Typ_Low
, Index_Typ_High
, Aggr_Low
, Aggr_High
);
3081 Check_Bounds
(Index_Base_Low
, Index_Base_High
, Aggr_Low
, Aggr_High
);
3085 if Others_Present
and then Nb_Discrete_Choices
> 0 then
3086 Check_Bounds
(Aggr_Low
, Aggr_High
, Choices_Low
, Choices_High
);
3087 Check_Bounds
(Index_Typ_Low
, Index_Typ_High
,
3088 Choices_Low
, Choices_High
);
3089 Check_Bounds
(Index_Base_Low
, Index_Base_High
,
3090 Choices_Low
, Choices_High
);
3094 elsif Others_Present
and then Nb_Elements
> 0 then
3095 Check_Length
(Aggr_Low
, Aggr_High
, Nb_Elements
);
3096 Check_Length
(Index_Typ_Low
, Index_Typ_High
, Nb_Elements
);
3097 Check_Length
(Index_Base_Low
, Index_Base_High
, Nb_Elements
);
3100 if Raises_Constraint_Error
(Aggr_Low
)
3101 or else Raises_Constraint_Error
(Aggr_High
)
3103 Set_Raises_Constraint_Error
(N
);
3106 Aggr_Low
:= Duplicate_Subexpr
(Aggr_Low
);
3108 -- Do not duplicate Aggr_High if Aggr_High = Aggr_Low + Nb_Elements
3109 -- since the addition node returned by Add is not yet analyzed. Attach
3110 -- to tree and analyze first. Reset analyzed flag to ensure it will get
3111 -- analyzed when it is a literal bound whose type must be properly set.
3113 if Others_Present
or else Nb_Discrete_Choices
> 0 then
3114 Aggr_High
:= Duplicate_Subexpr
(Aggr_High
);
3116 if Etype
(Aggr_High
) = Universal_Integer
then
3117 Set_Analyzed
(Aggr_High
, False);
3121 -- If the aggregate already has bounds attached to it, it means this is
3122 -- a positional aggregate created as an optimization by
3123 -- Exp_Aggr.Convert_To_Positional, so we don't want to change those
3126 if Present
(Aggregate_Bounds
(N
))
3127 and then not Others_Allowed
3128 and then not Comes_From_Source
(N
)
3130 Aggr_Low
:= Low_Bound
(Aggregate_Bounds
(N
));
3131 Aggr_High
:= High_Bound
(Aggregate_Bounds
(N
));
3134 Set_Aggregate_Bounds
3135 (N
, Make_Range
(Loc
, Low_Bound
=> Aggr_Low
, High_Bound
=> Aggr_High
));
3137 -- The bounds may contain expressions that must be inserted upwards.
3138 -- Attach them fully to the tree. After analysis, remove side effects
3139 -- from upper bound, if still needed.
3141 Set_Parent
(Aggregate_Bounds
(N
), N
);
3142 Analyze_And_Resolve
(Aggregate_Bounds
(N
), Index_Typ
);
3143 Check_Unset_Reference
(Aggregate_Bounds
(N
));
3145 if not Others_Present
and then Nb_Discrete_Choices
= 0 then
3147 (Aggregate_Bounds
(N
),
3148 Duplicate_Subexpr
(High_Bound
(Aggregate_Bounds
(N
))));
3151 -- Check the dimensions of each component in the array aggregate
3153 Analyze_Dimension_Array_Aggregate
(N
, Component_Typ
);
3156 end Resolve_Array_Aggregate
;
3158 ---------------------------------
3159 -- Resolve_Container_Aggregate --
3160 ---------------------------------
3162 procedure Resolve_Container_Aggregate
(N
: Node_Id
; Typ
: Entity_Id
) is
3163 procedure Resolve_Iterated_Association
3165 Key_Type
: Entity_Id
;
3166 Elmt_Type
: Entity_Id
);
3167 -- Resolve choices and expression in an iterated component association
3168 -- or an iterated element association, which has a key_expression.
3169 -- This is similar but not identical to the handling of this construct
3170 -- in an array aggregate.
3171 -- For a named container, the type of each choice must be compatible
3172 -- with the key type. For a positional container, the choice must be
3173 -- a subtype indication or an iterator specification that determines
3176 Asp
: constant Node_Id
:= Find_Value_Of_Aspect
(Typ
, Aspect_Aggregate
);
3178 Empty_Subp
: Node_Id
:= Empty
;
3179 Add_Named_Subp
: Node_Id
:= Empty
;
3180 Add_Unnamed_Subp
: Node_Id
:= Empty
;
3181 New_Indexed_Subp
: Node_Id
:= Empty
;
3182 Assign_Indexed_Subp
: Node_Id
:= Empty
;
3184 ----------------------------------
3185 -- Resolve_Iterated_Association --
3186 ----------------------------------
3188 procedure Resolve_Iterated_Association
3190 Key_Type
: Entity_Id
;
3191 Elmt_Type
: Entity_Id
)
3193 Loc
: constant Source_Ptr
:= Sloc
(N
);
3201 Typ
: Entity_Id
:= Empty
;
3204 Error_Msg_Ada_2022_Feature
("iterated component", Loc
);
3206 -- If this is an Iterated_Element_Association then either a
3207 -- an Iterator_Specification or a Loop_Parameter specification
3208 -- is present. In both cases a Key_Expression is present.
3210 if Nkind
(Comp
) = N_Iterated_Element_Association
then
3212 -- Create a temporary scope to avoid some modifications from
3213 -- escaping the Analyze call below. The original Tree will be
3214 -- reanalyzed later.
3216 Ent
:= New_Internal_Entity
3217 (E_Loop
, Current_Scope
, Sloc
(Comp
), 'L');
3218 Set_Etype
(Ent
, Standard_Void_Type
);
3219 Set_Parent
(Ent
, Parent
(Comp
));
3222 if Present
(Loop_Parameter_Specification
(Comp
)) then
3223 Copy
:= Copy_Separate_Tree
(Comp
);
3226 (Loop_Parameter_Specification
(Copy
));
3228 Id_Name
:= Chars
(Defining_Identifier
3229 (Loop_Parameter_Specification
(Comp
)));
3231 Copy
:= Copy_Separate_Tree
(Iterator_Specification
(Comp
));
3234 Id_Name
:= Chars
(Defining_Identifier
3235 (Iterator_Specification
(Comp
)));
3238 -- Key expression must have the type of the key. We analyze
3239 -- a copy of the original expression, because it will be
3240 -- reanalyzed and copied as needed during expansion of the
3241 -- corresponding loop.
3243 Key_Expr
:= Key_Expression
(Comp
);
3244 Analyze_And_Resolve
(New_Copy_Tree
(Key_Expr
), Key_Type
);
3249 elsif Present
(Iterator_Specification
(Comp
)) then
3250 -- Create a temporary scope to avoid some modifications from
3251 -- escaping the Analyze call below. The original Tree will be
3252 -- reanalyzed later.
3254 Ent
:= New_Internal_Entity
3255 (E_Loop
, Current_Scope
, Sloc
(Comp
), 'L');
3256 Set_Etype
(Ent
, Standard_Void_Type
);
3257 Set_Parent
(Ent
, Parent
(Comp
));
3260 Copy
:= Copy_Separate_Tree
(Iterator_Specification
(Comp
));
3262 Chars
(Defining_Identifier
(Iterator_Specification
(Comp
)));
3268 Typ
:= Etype
(Defining_Identifier
(Copy
));
3271 Choice
:= First
(Discrete_Choices
(Comp
));
3273 while Present
(Choice
) loop
3276 -- Choice can be a subtype name, a range, or an expression
3278 if Is_Entity_Name
(Choice
)
3279 and then Is_Type
(Entity
(Choice
))
3280 and then Base_Type
(Entity
(Choice
)) = Base_Type
(Key_Type
)
3284 elsif Present
(Key_Type
) then
3285 Analyze_And_Resolve
(Choice
, Key_Type
);
3288 Typ
:= Etype
(Choice
); -- assume unique for now
3294 Id_Name
:= Chars
(Defining_Identifier
(Comp
));
3297 -- Create a scope in which to introduce an index, which is usually
3298 -- visible in the expression for the component, and needed for its
3301 Id
:= Make_Defining_Identifier
(Sloc
(Comp
), Id_Name
);
3302 Ent
:= New_Internal_Entity
(E_Loop
,
3303 Current_Scope
, Sloc
(Comp
), 'L');
3304 Set_Etype
(Ent
, Standard_Void_Type
);
3305 Set_Parent
(Ent
, Parent
(Comp
));
3308 -- Insert and decorate the loop variable in the current scope.
3309 -- The expression has to be analyzed once the loop variable is
3310 -- directly visible. Mark the variable as referenced to prevent
3311 -- spurious warnings, given that subsequent uses of its name in the
3312 -- expression will reference the internal (synonym) loop variable.
3316 pragma Assert
(Present
(Typ
));
3317 Set_Etype
(Id
, Typ
);
3319 Mutate_Ekind
(Id
, E_Variable
);
3320 Set_Is_Not_Self_Hidden
(Id
);
3321 Set_Scope
(Id
, Ent
);
3322 Set_Referenced
(Id
);
3324 -- Analyze a copy of the expression, to verify legality. We use
3325 -- a copy because the expression will be analyzed anew when the
3326 -- enclosing aggregate is expanded, and the construct is rewritten
3327 -- as a loop with a new index variable.
3329 Expr
:= New_Copy_Tree
(Expression
(Comp
));
3330 Preanalyze_And_Resolve
(Expr
, Elmt_Type
);
3333 end Resolve_Iterated_Association
;
3335 -- Start of processing for Resolve_Container_Aggregate
3338 pragma Assert
(Nkind
(Asp
) = N_Aggregate
);
3341 Parse_Aspect_Aggregate
(Asp
,
3342 Empty_Subp
, Add_Named_Subp
, Add_Unnamed_Subp
,
3343 New_Indexed_Subp
, Assign_Indexed_Subp
);
3345 if Present
(Add_Unnamed_Subp
)
3346 and then No
(New_Indexed_Subp
)
3347 and then Present
(Etype
(Add_Unnamed_Subp
))
3348 and then Etype
(Add_Unnamed_Subp
) /= Any_Type
3351 Elmt_Type
: constant Entity_Id
:=
3353 (First_Formal
(Entity
(Add_Unnamed_Subp
))));
3357 if Present
(Expressions
(N
)) then
3358 -- positional aggregate
3360 Comp
:= First
(Expressions
(N
));
3361 while Present
(Comp
) loop
3362 Analyze_And_Resolve
(Comp
, Elmt_Type
);
3367 -- Empty aggregate, to be replaced by Empty during
3368 -- expansion, or iterated component association.
3370 if Present
(Component_Associations
(N
)) then
3372 Comp
: Node_Id
:= First
(Component_Associations
(N
));
3374 while Present
(Comp
) loop
3376 N_Iterated_Component_Association
3378 Error_Msg_N
("illegal component association "
3379 & "for unnamed container aggregate", Comp
);
3382 Resolve_Iterated_Association
3383 (Comp
, Empty
, Elmt_Type
);
3392 elsif Present
(Add_Named_Subp
)
3393 and then Etype
(Add_Named_Subp
) /= Any_Type
3396 -- Retrieves types of container, key, and element from the
3397 -- specified insertion procedure.
3399 Container
: constant Entity_Id
:=
3400 First_Formal
(Entity
(Add_Named_Subp
));
3401 Key_Type
: constant Entity_Id
:= Etype
(Next_Formal
(Container
));
3402 Elmt_Type
: constant Entity_Id
:=
3403 Etype
(Next_Formal
(Next_Formal
(Container
)));
3408 Comp
:= First
(Component_Associations
(N
));
3409 while Present
(Comp
) loop
3410 if Nkind
(Comp
) = N_Component_Association
then
3411 Choice
:= First
(Choices
(Comp
));
3413 while Present
(Choice
) loop
3414 Analyze_And_Resolve
(Choice
, Key_Type
);
3415 if not Is_Static_Expression
(Choice
) then
3416 Error_Msg_N
("choice must be static", Choice
);
3422 Analyze_And_Resolve
(Expression
(Comp
), Elmt_Type
);
3424 elsif Nkind
(Comp
) in
3425 N_Iterated_Component_Association |
3426 N_Iterated_Element_Association
3428 Resolve_Iterated_Association
3429 (Comp
, Key_Type
, Elmt_Type
);
3436 elsif Present
(Assign_Indexed_Subp
)
3437 and then Etype
(Assign_Indexed_Subp
) /= Any_Type
3439 -- Indexed Aggregate. Positional or indexed component
3440 -- can be present, but not both. Choices must be static
3441 -- values or ranges with static bounds.
3444 Container
: constant Entity_Id
:=
3445 First_Formal
(Entity
(Assign_Indexed_Subp
));
3446 Index_Type
: constant Entity_Id
:= Etype
(Next_Formal
(Container
));
3447 Comp_Type
: constant Entity_Id
:=
3448 Etype
(Next_Formal
(Next_Formal
(Container
)));
3451 Num_Choices
: Nat
:= 0;
3456 if Present
(Expressions
(N
)) then
3457 Comp
:= First
(Expressions
(N
));
3458 while Present
(Comp
) loop
3459 Analyze_And_Resolve
(Comp
, Comp_Type
);
3464 if Present
(Component_Associations
(N
))
3465 and then not Is_Empty_List
(Component_Associations
(N
))
3467 if Present
(Expressions
(N
))
3468 and then not Is_Empty_List
(Expressions
(N
))
3470 Error_Msg_N
("container aggregate cannot be "
3471 & "both positional and named", N
);
3475 Comp
:= First
(Component_Associations
(N
));
3477 while Present
(Comp
) loop
3478 if Nkind
(Comp
) = N_Component_Association
then
3479 Choice
:= First
(Choices
(Comp
));
3481 while Present
(Choice
) loop
3482 Analyze_And_Resolve
(Choice
, Index_Type
);
3483 Num_Choices
:= Num_Choices
+ 1;
3487 Analyze_And_Resolve
(Expression
(Comp
), Comp_Type
);
3489 elsif Nkind
(Comp
) in
3490 N_Iterated_Component_Association |
3491 N_Iterated_Element_Association
3493 Resolve_Iterated_Association
3494 (Comp
, Index_Type
, Comp_Type
);
3495 Num_Choices
:= Num_Choices
+ 1;
3501 -- The component associations in an indexed aggregate
3502 -- must denote a contiguous set of static values. We
3503 -- build a table of values/ranges and sort it, as is done
3504 -- elsewhere for case statements and array aggregates.
3505 -- If the aggregate has a single iterated association it
3506 -- is allowed to be nonstatic and there is nothing to check.
3508 if Num_Choices
> 1 then
3510 Table
: Case_Table_Type
(1 .. Num_Choices
);
3511 No_Choice
: Pos
:= 1;
3514 -- Traverse aggregate to determine size of needed table.
3515 -- Verify that bounds are static and that loops have no
3516 -- filters or key expressions.
3519 Comp
:= First
(Component_Associations
(N
));
3520 while Present
(Comp
) loop
3521 if Nkind
(Comp
) = N_Iterated_Element_Association
then
3523 (Loop_Parameter_Specification
(Comp
))
3525 if Present
(Iterator_Filter
3526 (Loop_Parameter_Specification
(Comp
)))
3529 ("iterator filter not allowed " &
3530 "in indexed aggregate", Comp
);
3533 elsif Present
(Key_Expression
3534 (Loop_Parameter_Specification
(Comp
)))
3537 ("key expression not allowed " &
3538 "in indexed aggregate", Comp
);
3543 Choice
:= First
(Choices
(Comp
));
3545 while Present
(Choice
) loop
3546 Get_Index_Bounds
(Choice
, Lo
, Hi
);
3547 Table
(No_Choice
).Choice
:= Choice
;
3548 Table
(No_Choice
).Lo
:= Lo
;
3549 Table
(No_Choice
).Hi
:= Hi
;
3551 -- Verify staticness of value or range
3553 if not Is_Static_Expression
(Lo
)
3554 or else not Is_Static_Expression
(Hi
)
3557 ("nonstatic expression for index " &
3558 "for indexed aggregate", Choice
);
3562 No_Choice
:= No_Choice
+ 1;
3570 Sort_Case_Table
(Table
);
3572 for J
in 1 .. Num_Choices
- 1 loop
3573 Hi_Val
:= Expr_Value
(Table
(J
).Hi
);
3574 Lo_Val
:= Expr_Value
(Table
(J
+ 1).Lo
);
3576 if Lo_Val
= Hi_Val
then
3578 ("duplicate index in indexed aggregate",
3579 Table
(J
+ 1).Choice
);
3582 elsif Lo_Val
< Hi_Val
then
3584 ("overlapping indices in indexed aggregate",
3585 Table
(J
+ 1).Choice
);
3588 elsif Lo_Val
> Hi_Val
+ 1 then
3590 ("missing index values", Table
(J
+ 1).Choice
);
3599 end Resolve_Container_Aggregate
;
3601 -----------------------------
3602 -- Resolve_Delta_Aggregate --
3603 -----------------------------
3605 procedure Resolve_Delta_Aggregate
(N
: Node_Id
; Typ
: Entity_Id
) is
3606 Base
: constant Node_Id
:= Expression
(N
);
3609 Error_Msg_Ada_2022_Feature
("delta aggregate", Sloc
(N
));
3611 if not Is_Composite_Type
(Typ
) then
3612 Error_Msg_N
("not a composite type", N
);
3615 Analyze_And_Resolve
(Base
, Typ
);
3617 if Is_Array_Type
(Typ
) then
3618 -- For an array_delta_aggregate, the base_expression and each
3619 -- expression in every array_component_association shall be of a
3620 -- nonlimited type; RM 4.3.4(13/5). However, to prevent repeated
3621 -- errors we only check the base expression and not array component
3624 if Is_Limited_Type
(Etype
(Base
)) then
3626 ("array delta aggregate shall be of a nonlimited type", Base
);
3627 Explain_Limited_Type
(Etype
(Base
), Base
);
3630 Resolve_Delta_Array_Aggregate
(N
, Typ
);
3633 -- Delta aggregates for record types must use parentheses,
3634 -- not square brackets.
3636 if Is_Homogeneous_Aggregate
(N
) then
3638 ("delta aggregates for record types must use (), not '[']", N
);
3641 -- The base_expression of a record_delta_aggregate can be of a
3642 -- limited type only if it is newly constructed; RM 7.5(2.1/5).
3644 Check_Expr_OK_In_Limited_Aggregate
(Base
);
3646 Resolve_Delta_Record_Aggregate
(N
, Typ
);
3650 end Resolve_Delta_Aggregate
;
3652 -----------------------------------
3653 -- Resolve_Delta_Array_Aggregate --
3654 -----------------------------------
3656 procedure Resolve_Delta_Array_Aggregate
(N
: Node_Id
; Typ
: Entity_Id
) is
3657 Deltas
: constant List_Id
:= Component_Associations
(N
);
3658 Index_Type
: constant Entity_Id
:= Etype
(First_Index
(Typ
));
3665 Assoc
:= First
(Deltas
);
3666 while Present
(Assoc
) loop
3667 if Nkind
(Assoc
) = N_Iterated_Component_Association
then
3668 Choice
:= First
(Choice_List
(Assoc
));
3669 while Present
(Choice
) loop
3670 if Nkind
(Choice
) = N_Others_Choice
then
3672 ("OTHERS not allowed in delta aggregate", Choice
);
3674 elsif Nkind
(Choice
) = N_Subtype_Indication
then
3675 Resolve_Discrete_Subtype_Indication
3676 (Choice
, Base_Type
(Index_Type
));
3679 Analyze_And_Resolve
(Choice
, Index_Type
);
3686 Id
: constant Entity_Id
:= Defining_Identifier
(Assoc
);
3687 Ent
: constant Entity_Id
:=
3689 (E_Loop
, Current_Scope
, Sloc
(Assoc
), 'L');
3692 Set_Etype
(Ent
, Standard_Void_Type
);
3693 Set_Parent
(Ent
, Assoc
);
3696 if No
(Scope
(Id
)) then
3697 Set_Etype
(Id
, Index_Type
);
3698 Mutate_Ekind
(Id
, E_Variable
);
3699 Set_Is_Not_Self_Hidden
(Id
);
3700 Set_Scope
(Id
, Ent
);
3704 -- Resolve a copy of the expression, after setting
3705 -- its parent properly to preserve its context.
3707 Expr
:= New_Copy_Tree
(Expression
(Assoc
));
3708 Set_Parent
(Expr
, Assoc
);
3709 Analyze_And_Resolve
(Expr
, Component_Type
(Typ
));
3714 Choice
:= First
(Choice_List
(Assoc
));
3715 while Present
(Choice
) loop
3718 if Nkind
(Choice
) = N_Others_Choice
then
3720 ("OTHERS not allowed in delta aggregate", Choice
);
3722 elsif Is_Entity_Name
(Choice
)
3723 and then Is_Type
(Entity
(Choice
))
3725 -- Choice covers a range of values
3727 if Base_Type
(Entity
(Choice
)) /=
3728 Base_Type
(Index_Type
)
3731 ("choice does not match index type of &",
3735 elsif Nkind
(Choice
) = N_Subtype_Indication
then
3736 Resolve_Discrete_Subtype_Indication
3737 (Choice
, Base_Type
(Index_Type
));
3740 Resolve
(Choice
, Index_Type
);
3746 -- For an array_delta_aggregate, the array_component_association
3747 -- shall not use the box symbol <>; RM 4.3.4(11/5).
3750 (Box_Present
(Assoc
) xor Present
(Expression
(Assoc
)));
3752 if Box_Present
(Assoc
) then
3754 ("'<'> in array delta aggregate is not allowed", Assoc
);
3756 Analyze_And_Resolve
(Expression
(Assoc
), Component_Type
(Typ
));
3762 end Resolve_Delta_Array_Aggregate
;
3764 ------------------------------------
3765 -- Resolve_Delta_Record_Aggregate --
3766 ------------------------------------
3768 procedure Resolve_Delta_Record_Aggregate
(N
: Node_Id
; Typ
: Entity_Id
) is
3770 -- Variables used to verify that discriminant-dependent components
3771 -- appear in the same variant.
3773 Comp_Ref
: Entity_Id
:= Empty
; -- init to avoid warning
3776 procedure Check_Variant
(Id
: Entity_Id
);
3777 -- If a given component of the delta aggregate appears in a variant
3778 -- part, verify that it is within the same variant as that of previous
3779 -- specified variant components of the delta.
3781 function Get_Component
(Nam
: Node_Id
) return Entity_Id
;
3782 -- Locate component with a given name and return it. If none found then
3783 -- report error and return Empty.
3785 function Nested_In
(V1
: Node_Id
; V2
: Node_Id
) return Boolean;
3786 -- Determine whether variant V1 is within variant V2
3788 function Variant_Depth
(N
: Node_Id
) return Natural;
3789 -- Determine the distance of a variant to the enclosing type declaration
3791 --------------------
3793 --------------------
3795 procedure Check_Variant
(Id
: Entity_Id
) is
3797 Comp_Variant
: Node_Id
;
3800 if not Has_Discriminants
(Typ
) then
3804 Comp
:= First_Entity
(Typ
);
3805 while Present
(Comp
) loop
3806 exit when Chars
(Comp
) = Chars
(Id
);
3807 Next_Component
(Comp
);
3810 -- Find the variant, if any, whose component list includes the
3811 -- component declaration.
3813 Comp_Variant
:= Parent
(Parent
(List_Containing
(Parent
(Comp
))));
3814 if Nkind
(Comp_Variant
) = N_Variant
then
3815 if No
(Variant
) then
3816 Variant
:= Comp_Variant
;
3819 elsif Variant
/= Comp_Variant
then
3821 D1
: constant Integer := Variant_Depth
(Variant
);
3822 D2
: constant Integer := Variant_Depth
(Comp_Variant
);
3827 (D1
> D2
and then not Nested_In
(Variant
, Comp_Variant
))
3829 (D2
> D1
and then not Nested_In
(Comp_Variant
, Variant
))
3831 pragma Assert
(Present
(Comp_Ref
));
3832 Error_Msg_Node_2
:= Comp_Ref
;
3834 ("& and & appear in different variants", Id
, Comp
);
3836 -- Otherwise retain the deeper variant for subsequent tests
3839 Variant
:= Comp_Variant
;
3850 function Get_Component
(Nam
: Node_Id
) return Entity_Id
is
3854 Comp
:= First_Entity
(Typ
);
3855 while Present
(Comp
) loop
3856 if Chars
(Comp
) = Chars
(Nam
) then
3857 if Ekind
(Comp
) = E_Discriminant
then
3858 Error_Msg_N
("delta cannot apply to discriminant", Nam
);
3867 Error_Msg_NE
("type& has no component with this name", Nam
, Typ
);
3875 function Nested_In
(V1
, V2
: Node_Id
) return Boolean is
3880 while Nkind
(Par
) /= N_Full_Type_Declaration
loop
3885 Par
:= Parent
(Par
);
3895 function Variant_Depth
(N
: Node_Id
) return Natural is
3902 while Nkind
(Par
) /= N_Full_Type_Declaration
loop
3904 Par
:= Parent
(Par
);
3912 Deltas
: constant List_Id
:= Component_Associations
(N
);
3917 Comp_Type
: Entity_Id
:= Empty
; -- init to avoid warning
3919 -- Start of processing for Resolve_Delta_Record_Aggregate
3924 Assoc
:= First
(Deltas
);
3925 while Present
(Assoc
) loop
3926 Choice
:= First
(Choice_List
(Assoc
));
3927 while Present
(Choice
) loop
3928 Comp
:= Get_Component
(Choice
);
3930 if Present
(Comp
) then
3931 Check_Variant
(Choice
);
3933 Comp_Type
:= Etype
(Comp
);
3935 -- Decorate the component reference by setting its entity and
3936 -- type, as otherwise backends like GNATprove would have to
3937 -- rediscover this information by themselves.
3939 Set_Entity
(Choice
, Comp
);
3940 Set_Etype
(Choice
, Comp_Type
);
3942 Comp_Type
:= Any_Type
;
3948 pragma Assert
(Present
(Comp_Type
));
3950 -- A record_component_association in record_delta_aggregate shall not
3951 -- use the box compound delimiter <> rather than an expression; see
3952 -- RM 4.3.1(17.3/5).
3954 pragma Assert
(Present
(Expression
(Assoc
)) xor Box_Present
(Assoc
));
3956 if Box_Present
(Assoc
) then
3958 ("'<'> in record delta aggregate is not allowed", Assoc
);
3960 Analyze_And_Resolve
(Expression
(Assoc
), Comp_Type
);
3962 -- The expression must not be of a limited type; RM 4.3.1(17.4/5)
3964 if Is_Limited_Type
(Etype
(Expression
(Assoc
))) then
3966 ("expression of a limited type in record delta aggregate " &
3968 Expression
(Assoc
));
3974 end Resolve_Delta_Record_Aggregate
;
3976 ---------------------------------
3977 -- Resolve_Extension_Aggregate --
3978 ---------------------------------
3980 -- There are two cases to consider:
3982 -- a) If the ancestor part is a type mark, the components needed are the
3983 -- difference between the components of the expected type and the
3984 -- components of the given type mark.
3986 -- b) If the ancestor part is an expression, it must be unambiguous, and
3987 -- once we have its type we can also compute the needed components as in
3988 -- the previous case. In both cases, if the ancestor type is not the
3989 -- immediate ancestor, we have to build this ancestor recursively.
3991 -- In both cases, discriminants of the ancestor type do not play a role in
3992 -- the resolution of the needed components, because inherited discriminants
3993 -- cannot be used in a type extension. As a result we can compute
3994 -- independently the list of components of the ancestor type and of the
3997 procedure Resolve_Extension_Aggregate
(N
: Node_Id
; Typ
: Entity_Id
) is
3998 A
: constant Node_Id
:= Ancestor_Part
(N
);
4003 function Valid_Limited_Ancestor
(Anc
: Node_Id
) return Boolean;
4004 -- If the type is limited, verify that the ancestor part is a legal
4005 -- expression (aggregate or function call, including 'Input)) that does
4006 -- not require a copy, as specified in 7.5(2).
4008 function Valid_Ancestor_Type
return Boolean;
4009 -- Verify that the type of the ancestor part is a non-private ancestor
4010 -- of the expected type, which must be a type extension.
4012 procedure Transform_BIP_Assignment
(Typ
: Entity_Id
);
4013 -- For an extension aggregate whose ancestor part is a build-in-place
4014 -- call returning a nonlimited type, this is used to transform the
4015 -- assignment to the ancestor part to use a temp.
4017 ----------------------------
4018 -- Valid_Limited_Ancestor --
4019 ----------------------------
4021 function Valid_Limited_Ancestor
(Anc
: Node_Id
) return Boolean is
4023 if Is_Entity_Name
(Anc
) and then Is_Type
(Entity
(Anc
)) then
4026 -- The ancestor must be a call or an aggregate, but a call may
4027 -- have been expanded into a temporary, so check original node.
4029 elsif Nkind
(Anc
) in N_Aggregate
4030 | N_Extension_Aggregate
4035 elsif Nkind
(Original_Node
(Anc
)) = N_Function_Call
then
4038 elsif Nkind
(Anc
) = N_Attribute_Reference
4039 and then Attribute_Name
(Anc
) = Name_Input
4043 elsif Nkind
(Anc
) = N_Qualified_Expression
then
4044 return Valid_Limited_Ancestor
(Expression
(Anc
));
4046 elsif Nkind
(Anc
) = N_Raise_Expression
then
4052 end Valid_Limited_Ancestor
;
4054 -------------------------
4055 -- Valid_Ancestor_Type --
4056 -------------------------
4058 function Valid_Ancestor_Type
return Boolean is
4059 Imm_Type
: Entity_Id
;
4062 Imm_Type
:= Base_Type
(Typ
);
4063 while Is_Derived_Type
(Imm_Type
) loop
4064 if Etype
(Imm_Type
) = Base_Type
(A_Type
) then
4067 -- The base type of the parent type may appear as a private
4068 -- extension if it is declared as such in a parent unit of the
4069 -- current one. For consistency of the subsequent analysis use
4070 -- the partial view for the ancestor part.
4072 elsif Is_Private_Type
(Etype
(Imm_Type
))
4073 and then Present
(Full_View
(Etype
(Imm_Type
)))
4074 and then Base_Type
(A_Type
) = Full_View
(Etype
(Imm_Type
))
4076 A_Type
:= Etype
(Imm_Type
);
4079 -- The parent type may be a private extension. The aggregate is
4080 -- legal if the type of the aggregate is an extension of it that
4081 -- is not a private extension.
4083 elsif Is_Private_Type
(A_Type
)
4084 and then not Is_Private_Type
(Imm_Type
)
4085 and then Present
(Full_View
(A_Type
))
4086 and then Base_Type
(Full_View
(A_Type
)) = Etype
(Imm_Type
)
4090 -- The parent type may be a raise expression (which is legal in
4091 -- any expression context).
4093 elsif A_Type
= Raise_Type
then
4094 A_Type
:= Etype
(Imm_Type
);
4098 Imm_Type
:= Etype
(Base_Type
(Imm_Type
));
4102 -- If previous loop did not find a proper ancestor, report error
4104 Error_Msg_NE
("expect ancestor type of &", A
, Typ
);
4106 end Valid_Ancestor_Type
;
4108 ------------------------------
4109 -- Transform_BIP_Assignment --
4110 ------------------------------
4112 procedure Transform_BIP_Assignment
(Typ
: Entity_Id
) is
4113 Loc
: constant Source_Ptr
:= Sloc
(N
);
4114 Def_Id
: constant Entity_Id
:= Make_Temporary
(Loc
, 'Y', A
);
4115 Obj_Decl
: constant Node_Id
:=
4116 Make_Object_Declaration
(Loc
,
4117 Defining_Identifier
=> Def_Id
,
4118 Constant_Present
=> True,
4119 Object_Definition
=> New_Occurrence_Of
(Typ
, Loc
),
4121 Has_Init_Expression
=> True);
4123 Set_Etype
(Def_Id
, Typ
);
4124 Set_Ancestor_Part
(N
, New_Occurrence_Of
(Def_Id
, Loc
));
4125 Insert_Action
(N
, Obj_Decl
);
4126 end Transform_BIP_Assignment
;
4128 -- Start of processing for Resolve_Extension_Aggregate
4131 -- Analyze the ancestor part and account for the case where it is a
4132 -- parameterless function call.
4135 Check_Parameterless_Call
(A
);
4137 if Is_Entity_Name
(A
) and then Is_Type
(Entity
(A
)) then
4139 -- AI05-0115: If the ancestor part is a subtype mark, the ancestor
4140 -- must not have unknown discriminants. To catch cases where the
4141 -- aggregate occurs at a place where the full view of the ancestor
4142 -- type is visible and doesn't have unknown discriminants, but the
4143 -- aggregate type was derived from a partial view that has unknown
4144 -- discriminants, we check whether the aggregate type has unknown
4145 -- discriminants (unknown discriminants were inherited), along
4146 -- with checking that the partial view of the ancestor has unknown
4147 -- discriminants. (It might be sufficient to replace the entire
4148 -- condition with Has_Unknown_Discriminants (Typ), but that might
4149 -- miss some cases, not clear, and causes error changes in some tests
4150 -- such as class-wide cases, that aren't clearly improvements. ???)
4152 if Has_Unknown_Discriminants
(Entity
(A
))
4153 or else (Has_Unknown_Discriminants
(Typ
)
4154 and then Partial_View_Has_Unknown_Discr
(Entity
(A
)))
4157 ("aggregate not available for type& whose ancestor "
4158 & "has unknown discriminants", N
, Typ
);
4162 if not Is_Tagged_Type
(Typ
) then
4163 Error_Msg_N
("type of extension aggregate must be tagged", N
);
4166 elsif Is_Limited_Type
(Typ
) then
4168 -- Ada 2005 (AI-287): Limited aggregates are allowed
4170 if Ada_Version
< Ada_2005
then
4171 Error_Msg_N
("aggregate type cannot be limited", N
);
4172 Explain_Limited_Type
(Typ
, N
);
4175 elsif Valid_Limited_Ancestor
(A
) then
4180 ("limited ancestor part must be aggregate or function call", A
);
4183 elsif Is_Class_Wide_Type
(Typ
) then
4184 Error_Msg_N
("aggregate cannot be of a class-wide type", N
);
4188 if Is_Entity_Name
(A
) and then Is_Type
(Entity
(A
)) then
4189 A_Type
:= Get_Full_View
(Entity
(A
));
4191 if Valid_Ancestor_Type
then
4192 Set_Entity
(A
, A_Type
);
4193 Set_Etype
(A
, A_Type
);
4195 Validate_Ancestor_Part
(N
);
4196 Resolve_Record_Aggregate
(N
, Typ
);
4199 elsif Nkind
(A
) /= N_Aggregate
then
4200 if Is_Overloaded
(A
) then
4203 Get_First_Interp
(A
, I
, It
);
4204 while Present
(It
.Typ
) loop
4206 -- Consider limited interpretations if Ada 2005 or higher
4208 if Is_Tagged_Type
(It
.Typ
)
4209 and then (Ada_Version
>= Ada_2005
4210 or else not Is_Limited_Type
(It
.Typ
))
4212 if A_Type
/= Any_Type
then
4213 Error_Msg_N
("cannot resolve expression", A
);
4220 Get_Next_Interp
(I
, It
);
4223 if A_Type
= Any_Type
then
4224 if Ada_Version
>= Ada_2005
then
4226 ("ancestor part must be of a tagged type", A
);
4229 ("ancestor part must be of a nonlimited tagged type", A
);
4236 A_Type
:= Etype
(A
);
4239 if Valid_Ancestor_Type
then
4240 Resolve
(A
, A_Type
);
4241 Check_Unset_Reference
(A
);
4242 Check_Non_Static_Context
(A
);
4244 -- The aggregate is illegal if the ancestor expression is a call
4245 -- to a function with a limited unconstrained result, unless the
4246 -- type of the aggregate is a null extension. This restriction
4247 -- was added in AI05-67 to simplify implementation.
4249 if Nkind
(A
) = N_Function_Call
4250 and then Is_Limited_Type
(A_Type
)
4251 and then not Is_Null_Extension
(Typ
)
4252 and then not Is_Constrained
(A_Type
)
4255 ("type of limited ancestor part must be constrained", A
);
4257 -- Reject the use of CPP constructors that leave objects partially
4258 -- initialized. For example:
4260 -- type CPP_Root is tagged limited record ...
4261 -- pragma Import (CPP, CPP_Root);
4263 -- type CPP_DT is new CPP_Root and Iface ...
4264 -- pragma Import (CPP, CPP_DT);
4266 -- type Ada_DT is new CPP_DT with ...
4268 -- Obj : Ada_DT := Ada_DT'(New_CPP_Root with others => <>);
4270 -- Using the constructor of CPP_Root the slots of the dispatch
4271 -- table of CPP_DT cannot be set, and the secondary tag of
4272 -- CPP_DT is unknown.
4274 elsif Nkind
(A
) = N_Function_Call
4275 and then Is_CPP_Constructor_Call
(A
)
4276 and then Enclosing_CPP_Parent
(Typ
) /= A_Type
4279 ("??must use 'C'P'P constructor for type &", A
,
4280 Enclosing_CPP_Parent
(Typ
));
4282 -- The following call is not needed if the previous warning
4283 -- is promoted to an error.
4285 Resolve_Record_Aggregate
(N
, Typ
);
4287 elsif Is_Class_Wide_Type
(Etype
(A
))
4288 and then Nkind
(Original_Node
(A
)) = N_Function_Call
4290 -- If the ancestor part is a dispatching call, it appears
4291 -- statically to be a legal ancestor, but it yields any member
4292 -- of the class, and it is not possible to determine whether
4293 -- it is an ancestor of the extension aggregate (much less
4294 -- which ancestor). It is not possible to determine the
4295 -- components of the extension part.
4297 -- This check implements AI-306, which in fact was motivated by
4298 -- an AdaCore query to the ARG after this test was added.
4300 Error_Msg_N
("ancestor part must be statically tagged", A
);
4302 -- We are using the build-in-place protocol, but we can't build
4303 -- in place, because we need to call the function before
4304 -- allocating the aggregate. Could do better for null
4305 -- extensions, and maybe for nondiscriminated types.
4306 -- This is wrong for limited, but those were wrong already.
4308 if not Is_Limited_View
(A_Type
)
4309 and then Is_Build_In_Place_Function_Call
(A
)
4311 Transform_BIP_Assignment
(A_Type
);
4314 Resolve_Record_Aggregate
(N
, Typ
);
4319 Error_Msg_N
("no unique type for this aggregate", A
);
4322 Check_Function_Writable_Actuals
(N
);
4323 end Resolve_Extension_Aggregate
;
4325 ----------------------------------
4326 -- Resolve_Null_Array_Aggregate --
4327 ----------------------------------
4329 function Resolve_Null_Array_Aggregate
(N
: Node_Id
) return Boolean is
4330 -- Never returns False, but declared as a function to match
4331 -- other Resolve_Mumble functions.
4333 Loc
: constant Source_Ptr
:= Sloc
(N
);
4334 Typ
: constant Entity_Id
:= Etype
(N
);
4338 Constr
: constant List_Id
:= New_List
;
4341 -- Attach the list of constraints at the location of the aggregate, so
4342 -- the individual constraints can be analyzed.
4344 Set_Parent
(Constr
, N
);
4346 -- Create a constrained subtype with null dimensions
4348 Index
:= First_Index
(Typ
);
4349 while Present
(Index
) loop
4350 Get_Index_Bounds
(Index
, L
=> Lo
, H
=> Hi
);
4352 -- The upper bound is the predecessor of the lower bound
4354 Hi
:= Make_Attribute_Reference
4356 Prefix
=> New_Occurrence_Of
(Etype
(Index
), Loc
),
4357 Attribute_Name
=> Name_Pred
,
4358 Expressions
=> New_List
(New_Copy_Tree
(Lo
)));
4360 Append
(Make_Range
(Loc
, New_Copy_Tree
(Lo
), Hi
), Constr
);
4361 Analyze_And_Resolve
(Last
(Constr
), Etype
(Index
));
4366 Set_Compile_Time_Known_Aggregate
(N
);
4367 Set_Aggregate_Bounds
(N
, First
(Constr
));
4370 end Resolve_Null_Array_Aggregate
;
4372 ------------------------------
4373 -- Resolve_Record_Aggregate --
4374 ------------------------------
4376 procedure Resolve_Record_Aggregate
(N
: Node_Id
; Typ
: Entity_Id
) is
4377 New_Assoc_List
: constant List_Id
:= New_List
;
4378 -- New_Assoc_List is the newly built list of N_Component_Association
4381 Others_Etype
: Entity_Id
:= Empty
;
4382 -- This variable is used to save the Etype of the last record component
4383 -- that takes its value from the others choice. Its purpose is:
4385 -- (a) make sure the others choice is useful
4387 -- (b) make sure the type of all the components whose value is
4388 -- subsumed by the others choice are the same.
4390 -- This variable is updated as a side effect of function Get_Value.
4392 Box_Node
: Node_Id
:= Empty
;
4393 Is_Box_Present
: Boolean := False;
4394 Is_Box_Init_By_Default
: Boolean := False;
4395 Others_Box
: Natural := 0;
4396 -- Ada 2005 (AI-287): Variables used in case of default initialization
4397 -- to provide a functionality similar to Others_Etype. Box_Present
4398 -- indicates that the component takes its default initialization;
4399 -- Others_Box counts the number of components of the current aggregate
4400 -- (which may be a sub-aggregate of a larger one) that are default-
4401 -- initialized. A value of One indicates that an others_box is present.
4402 -- Any larger value indicates that the others_box is not redundant.
4403 -- These variables, similar to Others_Etype, are also updated as a side
4404 -- effect of function Get_Value. Box_Node is used to place a warning on
4405 -- a redundant others_box.
4407 procedure Add_Association
4408 (Component
: Entity_Id
;
4410 Assoc_List
: List_Id
;
4411 Is_Box_Present
: Boolean := False);
4412 -- Builds a new N_Component_Association node which associates Component
4413 -- to expression Expr and adds it to the association list being built,
4414 -- either New_Assoc_List, or the association being built for an inner
4417 procedure Add_Discriminant_Values
4418 (New_Aggr
: Node_Id
;
4419 Assoc_List
: List_Id
);
4420 -- The constraint to a component may be given by a discriminant of the
4421 -- enclosing type, in which case we have to retrieve its value, which is
4422 -- part of the enclosing aggregate. Assoc_List provides the discriminant
4423 -- associations of the current type or of some enclosing record.
4425 function Discriminant_Present
(Input_Discr
: Entity_Id
) return Boolean;
4426 -- If aggregate N is a regular aggregate this routine will return True.
4427 -- Otherwise, if N is an extension aggregate, then Input_Discr denotes
4428 -- a discriminant whose value may already have been specified by N's
4429 -- ancestor part. This routine checks whether this is indeed the case
4430 -- and if so returns False, signaling that no value for Input_Discr
4431 -- should appear in N's aggregate part. Also, in this case, the routine
4432 -- appends to New_Assoc_List the discriminant value specified in the
4435 -- If the aggregate is in a context with expansion delayed, it will be
4436 -- reanalyzed. The inherited discriminant values must not be reinserted
4437 -- in the component list to prevent spurious errors, but they must be
4438 -- present on first analysis to build the proper subtype indications.
4439 -- The flag Inherited_Discriminant is used to prevent the re-insertion.
4441 function Find_Private_Ancestor
(Typ
: Entity_Id
) return Entity_Id
;
4442 -- AI05-0115: Find earlier ancestor in the derivation chain that is
4443 -- derived from private view Typ. Whether the aggregate is legal depends
4444 -- on the current visibility of the type as well as that of the parent
4448 (Compon
: Entity_Id
;
4450 Consider_Others_Choice
: Boolean := False) return Node_Id
;
4451 -- Given a record component stored in parameter Compon, this function
4452 -- returns its value as it appears in the list From, which is a list
4453 -- of N_Component_Association nodes.
4455 -- If no component association has a choice for the searched component,
4456 -- the value provided by the others choice is returned, if there is one,
4457 -- and Consider_Others_Choice is set to true. Otherwise Empty is
4458 -- returned. If there is more than one component association giving a
4459 -- value for the searched record component, an error message is emitted
4460 -- and the first found value is returned.
4462 -- If Consider_Others_Choice is set and the returned expression comes
4463 -- from the others choice, then Others_Etype is set as a side effect.
4464 -- An error message is emitted if the components taking their value from
4465 -- the others choice do not have same type.
4467 procedure Propagate_Discriminants
4469 Assoc_List
: List_Id
);
4470 -- Nested components may themselves be discriminated types constrained
4471 -- by outer discriminants, whose values must be captured before the
4472 -- aggregate is expanded into assignments.
4474 procedure Resolve_Aggr_Expr
(Expr
: Node_Id
; Component
: Entity_Id
);
4475 -- Analyzes and resolves expression Expr against the Etype of the
4476 -- Component. This routine also applies all appropriate checks to Expr.
4477 -- It finally saves a Expr in the newly created association list that
4478 -- will be attached to the final record aggregate. Note that if the
4479 -- Parent pointer of Expr is not set then Expr was produced with a
4480 -- New_Copy_Tree or some such.
4482 procedure Rewrite_Range
(Root_Type
: Entity_Id
; Rge
: Node_Id
);
4483 -- Rewrite a range node Rge when its bounds refer to non-stored
4484 -- discriminants from Root_Type, to replace them with the stored
4485 -- discriminant values. This is required in GNATprove mode, and is
4486 -- adopted in all modes to avoid special-casing GNATprove mode.
4488 ---------------------
4489 -- Add_Association --
4490 ---------------------
4492 procedure Add_Association
4493 (Component
: Entity_Id
;
4495 Assoc_List
: List_Id
;
4496 Is_Box_Present
: Boolean := False)
4498 Choice_List
: constant List_Id
:= New_List
;
4502 -- If this is a box association the expression is missing, so use the
4503 -- Sloc of the aggregate itself for the new association.
4505 pragma Assert
(Present
(Expr
) xor Is_Box_Present
);
4507 if Present
(Expr
) then
4513 Append_To
(Choice_List
, New_Occurrence_Of
(Component
, Loc
));
4515 Append_To
(Assoc_List
,
4516 Make_Component_Association
(Loc
,
4517 Choices
=> Choice_List
,
4519 Box_Present
=> Is_Box_Present
));
4521 -- If this association has a box for a component that is initialized
4522 -- by default, then set flag on the new association to indicate that
4523 -- the original association was for such a box-initialized component.
4525 if Is_Box_Init_By_Default
then
4526 Set_Was_Default_Init_Box_Association
(Last
(Assoc_List
));
4528 end Add_Association
;
4530 -----------------------------
4531 -- Add_Discriminant_Values --
4532 -----------------------------
4534 procedure Add_Discriminant_Values
4535 (New_Aggr
: Node_Id
;
4536 Assoc_List
: List_Id
)
4540 Discr_Elmt
: Elmt_Id
;
4541 Discr_Val
: Node_Id
;
4545 Discr
:= First_Discriminant
(Etype
(New_Aggr
));
4546 Discr_Elmt
:= First_Elmt
(Discriminant_Constraint
(Etype
(New_Aggr
)));
4547 while Present
(Discr_Elmt
) loop
4548 Discr_Val
:= Node
(Discr_Elmt
);
4550 -- If the constraint is given by a discriminant then it is a
4551 -- discriminant of an enclosing record, and its value has already
4552 -- been placed in the association list.
4554 if Is_Entity_Name
(Discr_Val
)
4555 and then Ekind
(Entity
(Discr_Val
)) = E_Discriminant
4557 Val
:= Entity
(Discr_Val
);
4559 Assoc
:= First
(Assoc_List
);
4560 while Present
(Assoc
) loop
4561 if Present
(Entity
(First
(Choices
(Assoc
))))
4562 and then Entity
(First
(Choices
(Assoc
))) = Val
4564 Discr_Val
:= Expression
(Assoc
);
4573 (Discr
, New_Copy_Tree
(Discr_Val
),
4574 Component_Associations
(New_Aggr
));
4576 -- If the discriminant constraint is a current instance, mark the
4577 -- current aggregate so that the self-reference can be expanded by
4578 -- Build_Record_Aggr_Code.Replace_Type later.
4580 if Nkind
(Discr_Val
) = N_Attribute_Reference
4581 and then Is_Entity_Name
(Prefix
(Discr_Val
))
4582 and then Is_Type
(Entity
(Prefix
(Discr_Val
)))
4585 (Entity
(Prefix
(Discr_Val
)),
4587 Use_Full_View
=> True)
4589 Set_Has_Self_Reference
(N
);
4592 Next_Elmt
(Discr_Elmt
);
4593 Next_Discriminant
(Discr
);
4595 end Add_Discriminant_Values
;
4597 --------------------------
4598 -- Discriminant_Present --
4599 --------------------------
4601 function Discriminant_Present
(Input_Discr
: Entity_Id
) return Boolean is
4602 Regular_Aggr
: constant Boolean := Nkind
(N
) /= N_Extension_Aggregate
;
4604 Ancestor_Is_Subtyp
: Boolean;
4609 Ancestor_Typ
: Entity_Id
;
4610 Comp_Assoc
: Node_Id
;
4612 Discr_Expr
: Node_Id
;
4613 Discr_Val
: Elmt_Id
:= No_Elmt
;
4614 Orig_Discr
: Entity_Id
;
4617 if Regular_Aggr
then
4621 -- Check whether inherited discriminant values have already been
4622 -- inserted in the aggregate. This will be the case if we are
4623 -- re-analyzing an aggregate whose expansion was delayed.
4625 if Present
(Component_Associations
(N
)) then
4626 Comp_Assoc
:= First
(Component_Associations
(N
));
4627 while Present
(Comp_Assoc
) loop
4628 if Inherited_Discriminant
(Comp_Assoc
) then
4636 Ancestor
:= Ancestor_Part
(N
);
4637 Ancestor_Typ
:= Etype
(Ancestor
);
4638 Loc
:= Sloc
(Ancestor
);
4640 -- For a private type with unknown discriminants, use the underlying
4641 -- record view if it is available.
4643 if Has_Unknown_Discriminants
(Ancestor_Typ
)
4644 and then Present
(Full_View
(Ancestor_Typ
))
4645 and then Present
(Underlying_Record_View
(Full_View
(Ancestor_Typ
)))
4647 Ancestor_Typ
:= Underlying_Record_View
(Full_View
(Ancestor_Typ
));
4650 Ancestor_Is_Subtyp
:=
4651 Is_Entity_Name
(Ancestor
) and then Is_Type
(Entity
(Ancestor
));
4653 -- If the ancestor part has no discriminants clearly N's aggregate
4654 -- part must provide a value for Discr.
4656 if not Has_Discriminants
(Ancestor_Typ
) then
4659 -- If the ancestor part is an unconstrained subtype mark then the
4660 -- Discr must be present in N's aggregate part.
4662 elsif Ancestor_Is_Subtyp
4663 and then not Is_Constrained
(Entity
(Ancestor
))
4668 -- Now look to see if Discr was specified in the ancestor part
4670 if Ancestor_Is_Subtyp
then
4672 First_Elmt
(Discriminant_Constraint
(Entity
(Ancestor
)));
4675 Orig_Discr
:= Original_Record_Component
(Input_Discr
);
4677 Discr
:= First_Discriminant
(Ancestor_Typ
);
4678 while Present
(Discr
) loop
4680 -- If Ancestor has already specified Disc value then insert its
4681 -- value in the final aggregate.
4683 if Original_Record_Component
(Discr
) = Orig_Discr
then
4684 if Ancestor_Is_Subtyp
then
4685 Discr_Expr
:= New_Copy_Tree
(Node
(Discr_Val
));
4688 Make_Selected_Component
(Loc
,
4689 Prefix
=> Duplicate_Subexpr
(Ancestor
),
4690 Selector_Name
=> New_Occurrence_Of
(Input_Discr
, Loc
));
4693 Resolve_Aggr_Expr
(Discr_Expr
, Input_Discr
);
4694 Set_Inherited_Discriminant
(Last
(New_Assoc_List
));
4698 Next_Discriminant
(Discr
);
4700 if Ancestor_Is_Subtyp
then
4701 Next_Elmt
(Discr_Val
);
4706 end Discriminant_Present
;
4708 ---------------------------
4709 -- Find_Private_Ancestor --
4710 ---------------------------
4712 function Find_Private_Ancestor
(Typ
: Entity_Id
) return Entity_Id
is
4718 if Has_Private_Ancestor
(Par
)
4719 and then not Has_Private_Ancestor
(Etype
(Base_Type
(Par
)))
4723 elsif not Is_Derived_Type
(Par
) then
4727 Par
:= Etype
(Base_Type
(Par
));
4730 end Find_Private_Ancestor
;
4737 (Compon
: Entity_Id
;
4739 Consider_Others_Choice
: Boolean := False) return Node_Id
4741 Typ
: constant Entity_Id
:= Etype
(Compon
);
4743 Expr
: Node_Id
:= Empty
;
4744 Selector_Name
: Node_Id
;
4747 Is_Box_Present
:= False;
4748 Is_Box_Init_By_Default
:= False;
4754 Assoc
:= First
(From
);
4755 while Present
(Assoc
) loop
4756 Selector_Name
:= First
(Choices
(Assoc
));
4757 while Present
(Selector_Name
) loop
4758 if Nkind
(Selector_Name
) = N_Others_Choice
then
4759 if Consider_Others_Choice
and then No
(Expr
) then
4761 -- We need to duplicate the expression for each
4762 -- successive component covered by the others choice.
4763 -- This is redundant if the others_choice covers only
4764 -- one component (small optimization possible???), but
4765 -- indispensable otherwise, because each one must be
4766 -- expanded individually to preserve side effects.
4768 -- Ada 2005 (AI-287): In case of default initialization
4769 -- of components, we duplicate the corresponding default
4770 -- expression (from the record type declaration). The
4771 -- copy must carry the sloc of the association (not the
4772 -- original expression) to prevent spurious elaboration
4773 -- checks when the default includes function calls.
4775 if Box_Present
(Assoc
) then
4776 Others_Box
:= Others_Box
+ 1;
4777 Is_Box_Present
:= True;
4779 if Expander_Active
then
4781 New_Copy_Tree_And_Copy_Dimensions
4782 (Expression
(Parent
(Compon
)),
4783 New_Sloc
=> Sloc
(Assoc
));
4785 return Expression
(Parent
(Compon
));
4789 if Present
(Others_Etype
)
4790 and then Base_Type
(Others_Etype
) /= Base_Type
(Typ
)
4792 -- If the components are of an anonymous access
4793 -- type they are distinct, but this is legal in
4794 -- Ada 2012 as long as designated types match.
4796 if (Ekind
(Typ
) = E_Anonymous_Access_Type
4797 or else Ekind
(Typ
) =
4798 E_Anonymous_Access_Subprogram_Type
)
4799 and then Designated_Type
(Typ
) =
4800 Designated_Type
(Others_Etype
)
4805 ("components in OTHERS choice must have same "
4806 & "type", Selector_Name
);
4810 Others_Etype
:= Typ
;
4812 -- Copy the expression so that it is resolved
4813 -- independently for each component, This is needed
4814 -- for accessibility checks on components of anonymous
4815 -- access types, even in compile_only mode.
4817 if not Inside_A_Generic
then
4819 New_Copy_Tree_And_Copy_Dimensions
4820 (Expression
(Assoc
));
4822 return Expression
(Assoc
);
4827 elsif Chars
(Compon
) = Chars
(Selector_Name
) then
4830 -- Ada 2005 (AI-231)
4832 if Ada_Version
>= Ada_2005
4833 and then Known_Null
(Expression
(Assoc
))
4835 Check_Can_Never_Be_Null
(Compon
, Expression
(Assoc
));
4838 -- We need to duplicate the expression when several
4839 -- components are grouped together with a "|" choice.
4840 -- For instance "filed1 | filed2 => Expr"
4842 -- Ada 2005 (AI-287)
4844 if Box_Present
(Assoc
) then
4845 Is_Box_Present
:= True;
4847 -- Duplicate the default expression of the component
4848 -- from the record type declaration, so a new copy
4849 -- can be attached to the association.
4851 -- Note that we always copy the default expression,
4852 -- even when the association has a single choice, in
4853 -- order to create a proper association for the
4854 -- expanded aggregate.
4856 -- Component may have no default, in which case the
4857 -- expression is empty and the component is default-
4858 -- initialized, but an association for the component
4859 -- exists, and it is not covered by an others clause.
4861 -- Scalar and private types have no initialization
4862 -- procedure, so they remain uninitialized. If the
4863 -- target of the aggregate is a constant this
4864 -- deserves a warning.
4866 if No
(Expression
(Parent
(Compon
)))
4867 and then not Has_Non_Null_Base_Init_Proc
(Typ
)
4868 and then not Has_Aspect
(Typ
, Aspect_Default_Value
)
4869 and then not Is_Concurrent_Type
(Typ
)
4870 and then Nkind
(Parent
(N
)) = N_Object_Declaration
4871 and then Constant_Present
(Parent
(N
))
4873 Error_Msg_Node_2
:= Typ
;
4875 ("??component& of type& is uninitialized",
4876 Assoc
, Selector_Name
);
4878 -- An additional reminder if the component type
4879 -- is a generic formal.
4881 if Is_Generic_Type
(Base_Type
(Typ
)) then
4883 ("\instance should provide actual type with "
4884 & "initialization for&", Assoc
, Typ
);
4889 New_Copy_Tree_And_Copy_Dimensions
4890 (Expression
(Parent
(Compon
)));
4893 if Present
(Next
(Selector_Name
)) then
4894 Expr
:= New_Copy_Tree_And_Copy_Dimensions
4895 (Expression
(Assoc
));
4897 Expr
:= Expression
(Assoc
);
4901 Generate_Reference
(Compon
, Selector_Name
, 'm');
4905 ("more than one value supplied for &",
4906 Selector_Name
, Compon
);
4911 Next
(Selector_Name
);
4920 -----------------------------
4921 -- Propagate_Discriminants --
4922 -----------------------------
4924 procedure Propagate_Discriminants
4926 Assoc_List
: List_Id
)
4928 Loc
: constant Source_Ptr
:= Sloc
(N
);
4930 procedure Process_Component
(Comp
: Entity_Id
);
4931 -- Add one component with a box association to the inner aggregate,
4932 -- and recurse if component is itself composite.
4934 -----------------------
4935 -- Process_Component --
4936 -----------------------
4938 procedure Process_Component
(Comp
: Entity_Id
) is
4939 T
: constant Entity_Id
:= Etype
(Comp
);
4943 if Is_Record_Type
(T
) and then Has_Discriminants
(T
) then
4944 New_Aggr
:= Make_Aggregate
(Loc
, No_List
, New_List
);
4945 Set_Etype
(New_Aggr
, T
);
4948 (Comp
, New_Aggr
, Component_Associations
(Aggr
));
4950 -- Collect discriminant values and recurse
4952 Add_Discriminant_Values
(New_Aggr
, Assoc_List
);
4953 Propagate_Discriminants
(New_Aggr
, Assoc_List
);
4955 Build_Constrained_Itype
4956 (New_Aggr
, T
, Component_Associations
(New_Aggr
));
4959 (Comp
, Empty
, Component_Associations
(Aggr
),
4960 Is_Box_Present
=> True);
4962 end Process_Component
;
4966 Aggr_Type
: constant Entity_Id
:= Base_Type
(Etype
(Aggr
));
4967 Components
: constant Elist_Id
:= New_Elmt_List
;
4968 Def_Node
: constant Node_Id
:=
4969 Type_Definition
(Declaration_Node
(Aggr_Type
));
4972 Comp_Elmt
: Elmt_Id
;
4975 -- Start of processing for Propagate_Discriminants
4978 -- The component type may be a variant type. Collect the components
4979 -- that are ruled by the known values of the discriminants. Their
4980 -- values have already been inserted into the component list of the
4981 -- current aggregate.
4983 if Nkind
(Def_Node
) = N_Record_Definition
4984 and then Present
(Component_List
(Def_Node
))
4985 and then Present
(Variant_Part
(Component_List
(Def_Node
)))
4987 Gather_Components
(Aggr_Type
,
4988 Component_List
(Def_Node
),
4989 Governed_By
=> Component_Associations
(Aggr
),
4991 Report_Errors
=> Errors
);
4993 Comp_Elmt
:= First_Elmt
(Components
);
4994 while Present
(Comp_Elmt
) loop
4995 if Ekind
(Node
(Comp_Elmt
)) /= E_Discriminant
then
4996 Process_Component
(Node
(Comp_Elmt
));
4999 Next_Elmt
(Comp_Elmt
);
5002 -- No variant part, iterate over all components
5005 Comp
:= First_Component
(Etype
(Aggr
));
5006 while Present
(Comp
) loop
5007 Process_Component
(Comp
);
5008 Next_Component
(Comp
);
5011 end Propagate_Discriminants
;
5013 -----------------------
5014 -- Resolve_Aggr_Expr --
5015 -----------------------
5017 procedure Resolve_Aggr_Expr
(Expr
: Node_Id
; Component
: Entity_Id
) is
5018 function Has_Expansion_Delayed
(Expr
: Node_Id
) return Boolean;
5019 -- If the expression is an aggregate (possibly qualified) then its
5020 -- expansion is delayed until the enclosing aggregate is expanded
5021 -- into assignments. In that case, do not generate checks on the
5022 -- expression, because they will be generated later, and will other-
5023 -- wise force a copy (to remove side effects) that would leave a
5024 -- dynamic-sized aggregate in the code, something that gigi cannot
5027 ---------------------------
5028 -- Has_Expansion_Delayed --
5029 ---------------------------
5031 function Has_Expansion_Delayed
(Expr
: Node_Id
) return Boolean is
5034 (Nkind
(Expr
) in N_Aggregate | N_Extension_Aggregate
5035 and then Present
(Etype
(Expr
))
5036 and then Is_Record_Type
(Etype
(Expr
))
5037 and then Expansion_Delayed
(Expr
))
5039 (Nkind
(Expr
) = N_Qualified_Expression
5040 and then Has_Expansion_Delayed
(Expression
(Expr
)));
5041 end Has_Expansion_Delayed
;
5045 Expr_Type
: Entity_Id
:= Empty
;
5046 New_C
: Entity_Id
:= Component
;
5050 -- Set to True if the resolved Expr node needs to be relocated when
5051 -- attached to the newly created association list. This node need not
5052 -- be relocated if its parent pointer is not set. In fact in this
5053 -- case Expr is the output of a New_Copy_Tree call. If Relocate is
5054 -- True then we have analyzed the expression node in the original
5055 -- aggregate and hence it needs to be relocated when moved over to
5056 -- the new association list.
5058 -- Start of processing for Resolve_Aggr_Expr
5061 -- If the type of the component is elementary or the type of the
5062 -- aggregate does not contain discriminants, use the type of the
5063 -- component to resolve Expr.
5065 if Is_Elementary_Type
(Etype
(Component
))
5066 or else not Has_Discriminants
(Etype
(N
))
5068 Expr_Type
:= Etype
(Component
);
5070 -- Otherwise we have to pick up the new type of the component from
5071 -- the new constrained subtype of the aggregate. In fact components
5072 -- which are of a composite type might be constrained by a
5073 -- discriminant, and we want to resolve Expr against the subtype were
5074 -- all discriminant occurrences are replaced with their actual value.
5077 New_C
:= First_Component
(Etype
(N
));
5078 while Present
(New_C
) loop
5079 if Chars
(New_C
) = Chars
(Component
) then
5080 Expr_Type
:= Etype
(New_C
);
5084 Next_Component
(New_C
);
5087 pragma Assert
(Present
(Expr_Type
));
5089 -- For each range in an array type where a discriminant has been
5090 -- replaced with the constraint, check that this range is within
5091 -- the range of the base type. This checks is done in the init
5092 -- proc for regular objects, but has to be done here for
5093 -- aggregates since no init proc is called for them.
5095 if Is_Array_Type
(Expr_Type
) then
5098 -- Range of the current constrained index in the array
5100 Orig_Index
: Node_Id
:= First_Index
(Etype
(Component
));
5101 -- Range corresponding to the range Index above in the
5102 -- original unconstrained record type. The bounds of this
5103 -- range may be governed by discriminants.
5105 Unconstr_Index
: Node_Id
:= First_Index
(Etype
(Expr_Type
));
5106 -- Range corresponding to the range Index above for the
5107 -- unconstrained array type. This range is needed to apply
5111 Index
:= First_Index
(Expr_Type
);
5112 while Present
(Index
) loop
5113 if Depends_On_Discriminant
(Orig_Index
) then
5114 Apply_Range_Check
(Index
, Etype
(Unconstr_Index
));
5118 Next_Index
(Orig_Index
);
5119 Next_Index
(Unconstr_Index
);
5125 -- If the Parent pointer of Expr is not set, Expr is an expression
5126 -- duplicated by New_Tree_Copy (this happens for record aggregates
5127 -- that look like (Field1 | Filed2 => Expr) or (others => Expr)).
5128 -- Such a duplicated expression must be attached to the tree
5129 -- before analysis and resolution to enforce the rule that a tree
5130 -- fragment should never be analyzed or resolved unless it is
5131 -- attached to the current compilation unit.
5133 if No
(Parent
(Expr
)) then
5134 Set_Parent
(Expr
, N
);
5140 Analyze_And_Resolve
(Expr
, Expr_Type
);
5141 Check_Expr_OK_In_Limited_Aggregate
(Expr
);
5142 Check_Non_Static_Context
(Expr
);
5143 Check_Unset_Reference
(Expr
);
5145 -- Check wrong use of class-wide types
5147 if Is_Class_Wide_Type
(Etype
(Expr
)) then
5148 Error_Msg_N
("dynamically tagged expression not allowed", Expr
);
5151 if not Has_Expansion_Delayed
(Expr
) then
5152 Aggregate_Constraint_Checks
(Expr
, Expr_Type
);
5155 -- If an aggregate component has a type with predicates, an explicit
5156 -- predicate check must be applied, as for an assignment statement,
5157 -- because the aggregate might not be expanded into individual
5158 -- component assignments.
5160 if Has_Predicates
(Expr_Type
)
5161 and then Analyzed
(Expr
)
5163 Apply_Predicate_Check
(Expr
, Expr_Type
);
5166 if Raises_Constraint_Error
(Expr
) then
5167 Set_Raises_Constraint_Error
(N
);
5170 -- If the expression has been marked as requiring a range check, then
5171 -- generate it here. It's a bit odd to be generating such checks in
5172 -- the analyzer, but harmless since Generate_Range_Check does nothing
5173 -- (other than making sure Do_Range_Check is set) if the expander is
5176 if Do_Range_Check
(Expr
) then
5177 Generate_Range_Check
(Expr
, Expr_Type
, CE_Range_Check_Failed
);
5180 -- Add association Component => Expr if the caller requests it
5183 New_Expr
:= Relocate_Node
(Expr
);
5185 -- Since New_Expr is not gonna be analyzed later on, we need to
5186 -- propagate here the dimensions form Expr to New_Expr.
5188 Copy_Dimensions
(Expr
, New_Expr
);
5194 Add_Association
(New_C
, New_Expr
, New_Assoc_List
);
5195 end Resolve_Aggr_Expr
;
5201 procedure Rewrite_Range
(Root_Type
: Entity_Id
; Rge
: Node_Id
) is
5202 procedure Rewrite_Bound
5205 Expr_Disc
: Node_Id
);
5206 -- Rewrite a bound of the range Bound, when it is equal to the
5207 -- non-stored discriminant Disc, into the stored discriminant
5214 procedure Rewrite_Bound
5217 Expr_Disc
: Node_Id
)
5220 if Nkind
(Bound
) /= N_Identifier
then
5224 -- We expect either the discriminant or the discriminal
5226 if Entity
(Bound
) = Disc
5227 or else (Ekind
(Entity
(Bound
)) = E_In_Parameter
5228 and then Discriminal_Link
(Entity
(Bound
)) = Disc
)
5230 Rewrite
(Bound
, New_Copy_Tree
(Expr_Disc
));
5236 Low
, High
: Node_Id
;
5238 Expr_Disc
: Elmt_Id
;
5240 -- Start of processing for Rewrite_Range
5243 if Has_Discriminants
(Root_Type
) and then Nkind
(Rge
) = N_Range
then
5244 Low
:= Low_Bound
(Rge
);
5245 High
:= High_Bound
(Rge
);
5247 Disc
:= First_Discriminant
(Root_Type
);
5248 Expr_Disc
:= First_Elmt
(Stored_Constraint
(Etype
(N
)));
5249 while Present
(Disc
) loop
5250 Rewrite_Bound
(Low
, Disc
, Node
(Expr_Disc
));
5251 Rewrite_Bound
(High
, Disc
, Node
(Expr_Disc
));
5252 Next_Discriminant
(Disc
);
5253 Next_Elmt
(Expr_Disc
);
5260 Components
: constant Elist_Id
:= New_Elmt_List
;
5261 -- Components is the list of the record components whose value must be
5262 -- provided in the aggregate. This list does include discriminants.
5264 Component
: Entity_Id
;
5265 Component_Elmt
: Elmt_Id
;
5267 Positional_Expr
: Node_Id
;
5269 -- Start of processing for Resolve_Record_Aggregate
5272 -- A record aggregate is restricted in SPARK:
5274 -- Each named association can have only a single choice.
5275 -- OTHERS cannot be used.
5276 -- Positional and named associations cannot be mixed.
5278 if Present
(Component_Associations
(N
)) then
5283 Assoc
:= First
(Component_Associations
(N
));
5284 while Present
(Assoc
) loop
5285 if Nkind
(Assoc
) = N_Iterated_Component_Association
then
5287 ("iterated component association can only appear in an "
5288 & "array aggregate", N
);
5289 raise Unrecoverable_Error
;
5297 -- We may end up calling Duplicate_Subexpr on expressions that are
5298 -- attached to New_Assoc_List. For this reason we need to attach it
5299 -- to the tree by setting its parent pointer to N. This parent point
5300 -- will change in STEP 8 below.
5302 Set_Parent
(New_Assoc_List
, N
);
5304 -- STEP 1: abstract type and null record verification
5306 if Is_Abstract_Type
(Typ
) then
5307 Error_Msg_N
("type of aggregate cannot be abstract", N
);
5310 if No
(First_Entity
(Typ
)) and then Null_Record_Present
(N
) then
5314 elsif Present
(First_Entity
(Typ
))
5315 and then Null_Record_Present
(N
)
5316 and then not Is_Tagged_Type
(Typ
)
5318 Error_Msg_N
("record aggregate cannot be null", N
);
5321 -- If the type has no components, then the aggregate should either
5322 -- have "null record", or in Ada 2005 it could instead have a single
5323 -- component association given by "others => <>". For Ada 95 we flag an
5324 -- error at this point, but for Ada 2005 we proceed with checking the
5325 -- associations below, which will catch the case where it's not an
5326 -- aggregate with "others => <>". Note that the legality of a <>
5327 -- aggregate for a null record type was established by AI05-016.
5329 elsif No
(First_Entity
(Typ
))
5330 and then Ada_Version
< Ada_2005
5332 Error_Msg_N
("record aggregate must be null", N
);
5336 -- A record aggregate can only use parentheses
5338 if Nkind
(N
) = N_Aggregate
5339 and then Is_Homogeneous_Aggregate
(N
)
5341 Error_Msg_N
("record aggregate must use (), not '[']", N
);
5345 -- STEP 2: Verify aggregate structure
5349 Bad_Aggregate
: Boolean := False;
5350 Selector_Name
: Node_Id
;
5353 if Present
(Component_Associations
(N
)) then
5354 Assoc
:= First
(Component_Associations
(N
));
5359 while Present
(Assoc
) loop
5360 Selector_Name
:= First
(Choices
(Assoc
));
5361 while Present
(Selector_Name
) loop
5362 if Nkind
(Selector_Name
) = N_Identifier
then
5365 elsif Nkind
(Selector_Name
) = N_Others_Choice
then
5366 if Selector_Name
/= First
(Choices
(Assoc
))
5367 or else Present
(Next
(Selector_Name
))
5370 ("OTHERS must appear alone in a choice list",
5374 elsif Present
(Next
(Assoc
)) then
5376 ("OTHERS must appear last in an aggregate",
5380 -- (Ada 2005): If this is an association with a box,
5381 -- indicate that the association need not represent
5384 elsif Box_Present
(Assoc
) then
5391 ("selector name should be identifier or OTHERS",
5393 Bad_Aggregate
:= True;
5396 Next
(Selector_Name
);
5402 if Bad_Aggregate
then
5407 -- STEP 3: Find discriminant Values
5410 Discrim
: Entity_Id
;
5411 Missing_Discriminants
: Boolean := False;
5414 if Present
(Expressions
(N
)) then
5415 Positional_Expr
:= First
(Expressions
(N
));
5417 Positional_Expr
:= Empty
;
5420 -- AI05-0115: if the ancestor part is a subtype mark, the ancestor
5421 -- must not have unknown discriminants.
5422 -- ??? We are not checking any subtype mark here and this code is not
5423 -- exercised by any test, so it's likely wrong (in particular
5424 -- we should not use Root_Type here but the subtype mark, if any),
5425 -- and possibly not needed.
5427 if Is_Derived_Type
(Typ
)
5428 and then Has_Unknown_Discriminants
(Root_Type
(Typ
))
5429 and then Nkind
(N
) /= N_Extension_Aggregate
5432 ("aggregate not available for type& whose ancestor "
5433 & "has unknown discriminants", N
, Typ
);
5436 if Has_Unknown_Discriminants
(Typ
)
5437 and then Present
(Underlying_Record_View
(Typ
))
5439 Discrim
:= First_Discriminant
(Underlying_Record_View
(Typ
));
5440 elsif Has_Discriminants
(Typ
) then
5441 Discrim
:= First_Discriminant
(Typ
);
5446 -- First find the discriminant values in the positional components
5448 while Present
(Discrim
) and then Present
(Positional_Expr
) loop
5449 if Discriminant_Present
(Discrim
) then
5450 Resolve_Aggr_Expr
(Positional_Expr
, Discrim
);
5452 -- Ada 2005 (AI-231)
5454 if Ada_Version
>= Ada_2005
5455 and then Known_Null
(Positional_Expr
)
5457 Check_Can_Never_Be_Null
(Discrim
, Positional_Expr
);
5460 Next
(Positional_Expr
);
5463 if Present
(Get_Value
(Discrim
, Component_Associations
(N
))) then
5465 ("more than one value supplied for discriminant&",
5469 Next_Discriminant
(Discrim
);
5472 -- Find remaining discriminant values if any among named components
5474 while Present
(Discrim
) loop
5475 Expr
:= Get_Value
(Discrim
, Component_Associations
(N
), True);
5477 if not Discriminant_Present
(Discrim
) then
5478 if Present
(Expr
) then
5480 ("more than one value supplied for discriminant &",
5484 elsif No
(Expr
) then
5486 ("no value supplied for discriminant &", N
, Discrim
);
5487 Missing_Discriminants
:= True;
5490 Resolve_Aggr_Expr
(Expr
, Discrim
);
5493 Next_Discriminant
(Discrim
);
5496 if Missing_Discriminants
then
5500 -- At this point and until the beginning of STEP 6, New_Assoc_List
5501 -- contains only the discriminants and their values.
5505 -- STEP 4: Set the Etype of the record aggregate
5507 if Has_Discriminants
(Typ
)
5508 or else (Has_Unknown_Discriminants
(Typ
)
5509 and then Present
(Underlying_Record_View
(Typ
)))
5511 Build_Constrained_Itype
(N
, Typ
, New_Assoc_List
);
5516 -- STEP 5: Get remaining components according to discriminant values
5520 Errors_Found
: Boolean := False;
5521 Record_Def
: Node_Id
;
5522 Parent_Typ
: Entity_Id
;
5523 Parent_Typ_List
: Elist_Id
;
5524 Parent_Elmt
: Elmt_Id
;
5525 Root_Typ
: Entity_Id
;
5528 if Is_Derived_Type
(Typ
) and then Is_Tagged_Type
(Typ
) then
5529 Parent_Typ_List
:= New_Elmt_List
;
5531 -- If this is an extension aggregate, the component list must
5532 -- include all components that are not in the given ancestor type.
5533 -- Otherwise, the component list must include components of all
5534 -- ancestors, starting with the root.
5536 if Nkind
(N
) = N_Extension_Aggregate
then
5537 Root_Typ
:= Base_Type
(Etype
(Ancestor_Part
(N
)));
5540 -- AI05-0115: check legality of aggregate for type with a
5541 -- private ancestor.
5543 Root_Typ
:= Root_Type
(Typ
);
5544 if Has_Private_Ancestor
(Typ
) then
5546 Ancestor
: constant Entity_Id
:=
5547 Find_Private_Ancestor
(Typ
);
5548 Ancestor_Unit
: constant Entity_Id
:=
5550 (Get_Source_Unit
(Ancestor
));
5551 Parent_Unit
: constant Entity_Id
:=
5552 Cunit_Entity
(Get_Source_Unit
5553 (Base_Type
(Etype
(Ancestor
))));
5555 -- Check whether we are in a scope that has full view
5556 -- over the private ancestor and its parent. This can
5557 -- only happen if the derivation takes place in a child
5558 -- unit of the unit that declares the parent, and we are
5559 -- in the private part or body of that child unit, else
5560 -- the aggregate is illegal.
5562 if Is_Child_Unit
(Ancestor_Unit
)
5563 and then Scope
(Ancestor_Unit
) = Parent_Unit
5564 and then In_Open_Scopes
(Scope
(Ancestor
))
5566 (In_Private_Part
(Scope
(Ancestor
))
5567 or else In_Package_Body
(Scope
(Ancestor
)))
5573 ("type of aggregate has private ancestor&!",
5575 Error_Msg_N
("must use extension aggregate!", N
);
5581 Dnode
:= Declaration_Node
(Base_Type
(Root_Typ
));
5583 -- If we don't get a full declaration, then we have some error
5584 -- which will get signalled later so skip this part. Otherwise
5585 -- gather components of root that apply to the aggregate type.
5586 -- We use the base type in case there is an applicable stored
5587 -- constraint that renames the discriminants of the root.
5589 if Nkind
(Dnode
) = N_Full_Type_Declaration
then
5590 Record_Def
:= Type_Definition
(Dnode
);
5593 Component_List
(Record_Def
),
5594 Governed_By
=> New_Assoc_List
,
5596 Report_Errors
=> Errors_Found
);
5598 if Errors_Found
then
5600 ("discriminant controlling variant part is not static",
5607 Parent_Typ
:= Base_Type
(Typ
);
5608 while Parent_Typ
/= Root_Typ
loop
5609 Prepend_Elmt
(Parent_Typ
, To
=> Parent_Typ_List
);
5610 Parent_Typ
:= Etype
(Parent_Typ
);
5612 -- Check whether a private parent requires the use of
5613 -- an extension aggregate. This test does not apply in
5614 -- an instantiation: if the generic unit is legal so is
5617 if Nkind
(Parent
(Base_Type
(Parent_Typ
))) =
5618 N_Private_Type_Declaration
5619 or else Nkind
(Parent
(Base_Type
(Parent_Typ
))) =
5620 N_Private_Extension_Declaration
5622 if Nkind
(N
) /= N_Extension_Aggregate
5623 and then not In_Instance
5626 ("type of aggregate has private ancestor&!",
5628 Error_Msg_N
("must use extension aggregate!", N
);
5631 elsif Parent_Typ
/= Root_Typ
then
5633 ("ancestor part of aggregate must be private type&",
5634 Ancestor_Part
(N
), Parent_Typ
);
5638 -- The current view of ancestor part may be a private type,
5639 -- while the context type is always non-private.
5641 elsif Is_Private_Type
(Root_Typ
)
5642 and then Present
(Full_View
(Root_Typ
))
5643 and then Nkind
(N
) = N_Extension_Aggregate
5645 exit when Base_Type
(Full_View
(Root_Typ
)) = Parent_Typ
;
5649 -- Now collect components from all other ancestors, beginning
5650 -- with the current type. If the type has unknown discriminants
5651 -- use the component list of the Underlying_Record_View, which
5652 -- needs to be used for the subsequent expansion of the aggregate
5653 -- into assignments.
5655 Parent_Elmt
:= First_Elmt
(Parent_Typ_List
);
5656 while Present
(Parent_Elmt
) loop
5657 Parent_Typ
:= Node
(Parent_Elmt
);
5659 if Has_Unknown_Discriminants
(Parent_Typ
)
5660 and then Present
(Underlying_Record_View
(Typ
))
5662 Parent_Typ
:= Underlying_Record_View
(Parent_Typ
);
5665 Record_Def
:= Type_Definition
(Parent
(Base_Type
(Parent_Typ
)));
5666 Gather_Components
(Parent_Typ
,
5667 Component_List
(Record_Extension_Part
(Record_Def
)),
5668 Governed_By
=> New_Assoc_List
,
5670 Report_Errors
=> Errors_Found
);
5672 Next_Elmt
(Parent_Elmt
);
5675 -- Typ is not a derived tagged type
5678 Record_Def
:= Type_Definition
(Parent
(Base_Type
(Typ
)));
5680 if Null_Present
(Record_Def
) then
5683 elsif not Has_Unknown_Discriminants
(Typ
) then
5686 Component_List
(Record_Def
),
5687 Governed_By
=> New_Assoc_List
,
5689 Report_Errors
=> Errors_Found
);
5693 (Base_Type
(Underlying_Record_View
(Typ
)),
5694 Component_List
(Record_Def
),
5695 Governed_By
=> New_Assoc_List
,
5697 Report_Errors
=> Errors_Found
);
5701 if Errors_Found
then
5706 -- STEP 6: Find component Values
5708 Component_Elmt
:= First_Elmt
(Components
);
5710 -- First scan the remaining positional associations in the aggregate.
5711 -- Remember that at this point Positional_Expr contains the current
5712 -- positional association if any is left after looking for discriminant
5713 -- values in step 3.
5715 while Present
(Positional_Expr
) and then Present
(Component_Elmt
) loop
5716 Component
:= Node
(Component_Elmt
);
5717 Resolve_Aggr_Expr
(Positional_Expr
, Component
);
5719 -- Ada 2005 (AI-231)
5721 if Ada_Version
>= Ada_2005
and then Known_Null
(Positional_Expr
) then
5722 Check_Can_Never_Be_Null
(Component
, Positional_Expr
);
5725 if Present
(Get_Value
(Component
, Component_Associations
(N
))) then
5727 ("more than one value supplied for component &", N
, Component
);
5730 Next
(Positional_Expr
);
5731 Next_Elmt
(Component_Elmt
);
5734 if Present
(Positional_Expr
) then
5736 ("too many components for record aggregate", Positional_Expr
);
5739 -- Now scan for the named arguments of the aggregate
5741 while Present
(Component_Elmt
) loop
5742 Component
:= Node
(Component_Elmt
);
5743 Expr
:= Get_Value
(Component
, Component_Associations
(N
), True);
5745 -- Note: The previous call to Get_Value sets the value of the
5746 -- variable Is_Box_Present.
5748 -- Ada 2005 (AI-287): Handle components with default initialization.
5749 -- Note: This feature was originally added to Ada 2005 for limited
5750 -- but it was finally allowed with any type.
5752 if Is_Box_Present
then
5753 Check_Box_Component
: declare
5754 Ctyp
: constant Entity_Id
:= Etype
(Component
);
5757 -- Initially assume that the box is for a default-initialized
5758 -- component and reset to False in cases where that's not true.
5760 Is_Box_Init_By_Default
:= True;
5762 -- If there is a default expression for the aggregate, copy
5763 -- it into a new association. This copy must modify the scopes
5764 -- of internal types that may be attached to the expression
5765 -- (e.g. index subtypes of arrays) because in general the type
5766 -- declaration and the aggregate appear in different scopes,
5767 -- and the backend requires the scope of the type to match the
5768 -- point at which it is elaborated.
5770 -- If the component has an initialization procedure (IP) we
5771 -- pass the component to the expander, which will generate
5772 -- the call to such IP.
5774 -- If the component has discriminants, their values must
5775 -- be taken from their subtype. This is indispensable for
5776 -- constraints that are given by the current instance of an
5777 -- enclosing type, to allow the expansion of the aggregate to
5778 -- replace the reference to the current instance by the target
5779 -- object of the aggregate.
5781 if Is_Case_Choice_Pattern
(N
) then
5783 -- Do not transform box component values in a case-choice
5787 (Component
=> Component
,
5789 Assoc_List
=> New_Assoc_List
,
5790 Is_Box_Present
=> True);
5792 elsif Present
(Parent
(Component
))
5793 and then Nkind
(Parent
(Component
)) = N_Component_Declaration
5794 and then Present
(Expression
(Parent
(Component
)))
5796 -- If component declaration has an initialization expression
5797 -- then this is not a case of default initialization.
5799 Is_Box_Init_By_Default
:= False;
5802 New_Copy_Tree_And_Copy_Dimensions
5803 (Expression
(Parent
(Component
)),
5804 New_Scope
=> Current_Scope
,
5805 New_Sloc
=> Sloc
(N
));
5807 -- As the type of the copied default expression may refer
5808 -- to discriminants of the record type declaration, these
5809 -- non-stored discriminants need to be rewritten into stored
5810 -- discriminant values for the aggregate. This is required
5811 -- in GNATprove mode, and is adopted in all modes to avoid
5812 -- special-casing GNATprove mode.
5814 if Is_Array_Type
(Etype
(Expr
)) then
5816 Rec_Typ
: constant Entity_Id
:= Scope
(Component
);
5817 -- Root record type whose discriminants may be used as
5818 -- bounds in range nodes.
5825 -- Rewrite the range nodes occurring in the indexes
5828 Index
:= First_Index
(Etype
(Expr
));
5829 while Present
(Index
) loop
5830 Rewrite_Range
(Rec_Typ
, Index
);
5832 (Rec_Typ
, Scalar_Range
(Etype
(Index
)));
5837 -- Rewrite the range nodes occurring as aggregate
5838 -- bounds and component associations.
5840 if Nkind
(Expr
) = N_Aggregate
then
5841 if Present
(Aggregate_Bounds
(Expr
)) then
5842 Rewrite_Range
(Rec_Typ
, Aggregate_Bounds
(Expr
));
5845 if Present
(Component_Associations
(Expr
)) then
5846 Assoc
:= First
(Component_Associations
(Expr
));
5847 while Present
(Assoc
) loop
5848 Choice
:= First
(Choices
(Assoc
));
5849 while Present
(Choice
) loop
5850 Rewrite_Range
(Rec_Typ
, Choice
);
5863 (Component
=> Component
,
5865 Assoc_List
=> New_Assoc_List
);
5866 Set_Has_Self_Reference
(N
);
5868 elsif Needs_Simple_Initialization
(Ctyp
) then
5870 (Component
=> Component
,
5872 Assoc_List
=> New_Assoc_List
,
5873 Is_Box_Present
=> True);
5875 elsif Has_Non_Null_Base_Init_Proc
(Ctyp
)
5876 or else not Expander_Active
5878 if Is_Record_Type
(Ctyp
)
5879 and then Has_Discriminants
(Ctyp
)
5880 and then not Is_Private_Type
(Ctyp
)
5882 -- We build a partially initialized aggregate with the
5883 -- values of the discriminants and box initialization
5884 -- for the rest, if other components are present.
5886 -- The type of the aggregate is the known subtype of
5887 -- the component. The capture of discriminants must be
5888 -- recursive because subcomponents may be constrained
5889 -- (transitively) by discriminants of enclosing types.
5890 -- For a private type with discriminants, a call to the
5891 -- initialization procedure will be generated, and no
5892 -- subaggregate is needed.
5894 Capture_Discriminants
: declare
5895 Loc
: constant Source_Ptr
:= Sloc
(N
);
5899 Expr
:= Make_Aggregate
(Loc
, No_List
, New_List
);
5900 Set_Etype
(Expr
, Ctyp
);
5902 -- If the enclosing type has discriminants, they have
5903 -- been collected in the aggregate earlier, and they
5904 -- may appear as constraints of subcomponents.
5906 -- Similarly if this component has discriminants, they
5907 -- might in turn be propagated to their components.
5909 if Has_Discriminants
(Typ
) then
5910 Add_Discriminant_Values
(Expr
, New_Assoc_List
);
5911 Propagate_Discriminants
(Expr
, New_Assoc_List
);
5913 elsif Has_Discriminants
(Ctyp
) then
5914 Add_Discriminant_Values
5915 (Expr
, Component_Associations
(Expr
));
5916 Propagate_Discriminants
5917 (Expr
, Component_Associations
(Expr
));
5919 Build_Constrained_Itype
5920 (Expr
, Ctyp
, Component_Associations
(Expr
));
5927 -- If the type has additional components, create
5928 -- an OTHERS box association for them.
5930 Comp
:= First_Component
(Ctyp
);
5931 while Present
(Comp
) loop
5932 if Ekind
(Comp
) = E_Component
then
5933 if not Is_Record_Type
(Etype
(Comp
)) then
5935 (Component_Associations
(Expr
),
5936 Make_Component_Association
(Loc
,
5939 Make_Others_Choice
(Loc
)),
5940 Expression
=> Empty
,
5941 Box_Present
=> True));
5947 Next_Component
(Comp
);
5953 (Component
=> Component
,
5955 Assoc_List
=> New_Assoc_List
);
5956 end Capture_Discriminants
;
5958 -- Otherwise the component type is not a record, or it has
5959 -- not discriminants, or it is private.
5963 (Component
=> Component
,
5965 Assoc_List
=> New_Assoc_List
,
5966 Is_Box_Present
=> True);
5969 -- Otherwise we only need to resolve the expression if the
5970 -- component has partially initialized values (required to
5971 -- expand the corresponding assignments and run-time checks).
5973 elsif Present
(Expr
)
5974 and then Is_Partially_Initialized_Type
(Ctyp
)
5976 Resolve_Aggr_Expr
(Expr
, Component
);
5978 end Check_Box_Component
;
5980 elsif No
(Expr
) then
5982 -- Ignore hidden components associated with the position of the
5983 -- interface tags: these are initialized dynamically.
5985 if No
(Related_Type
(Component
)) then
5987 ("no value supplied for component &!", N
, Component
);
5991 Resolve_Aggr_Expr
(Expr
, Component
);
5994 Next_Elmt
(Component_Elmt
);
5997 -- STEP 7: check for invalid components + check type in choice list
6001 New_Assoc
: Node_Id
;
6007 -- Type of first component in choice list
6010 if Present
(Component_Associations
(N
)) then
6011 Assoc
:= First
(Component_Associations
(N
));
6016 Verification
: while Present
(Assoc
) loop
6017 Selectr
:= First
(Choices
(Assoc
));
6020 if Nkind
(Selectr
) = N_Others_Choice
then
6022 -- Ada 2005 (AI-287): others choice may have expression or box
6024 if No
(Others_Etype
) and then Others_Box
= 0 then
6026 ("OTHERS must represent at least one component", Selectr
);
6028 elsif Others_Box
= 1 and then Warn_On_Redundant_Constructs
then
6029 Error_Msg_N
("OTHERS choice is redundant?r?", Box_Node
);
6031 ("\previous choices cover all components?r?", Box_Node
);
6037 while Present
(Selectr
) loop
6039 New_Assoc
:= First
(New_Assoc_List
);
6040 while Present
(New_Assoc
) loop
6041 Component
:= First
(Choices
(New_Assoc
));
6043 if Chars
(Selectr
) = Chars
(Component
) then
6045 Check_Identifier
(Selectr
, Entity
(Component
));
6054 -- If we found an association, then this is a legal component
6055 -- of the type in question.
6057 pragma Assert
(if Present
(New_Assoc
) then Present
(Component
));
6059 -- If no association, this is not a legal component of the type
6060 -- in question, unless its association is provided with a box.
6062 if No
(New_Assoc
) then
6063 if Box_Present
(Parent
(Selectr
)) then
6065 -- This may still be a bogus component with a box. Scan
6066 -- list of components to verify that a component with
6067 -- that name exists.
6073 C
:= First_Component
(Typ
);
6074 while Present
(C
) loop
6075 if Chars
(C
) = Chars
(Selectr
) then
6077 -- If the context is an extension aggregate,
6078 -- the component must not be inherited from
6079 -- the ancestor part of the aggregate.
6081 if Nkind
(N
) /= N_Extension_Aggregate
6083 Scope
(Original_Record_Component
(C
)) /=
6084 Etype
(Ancestor_Part
(N
))
6094 Error_Msg_Node_2
:= Typ
;
6095 Error_Msg_N
("& is not a component of}", Selectr
);
6099 elsif Chars
(Selectr
) /= Name_uTag
6100 and then Chars
(Selectr
) /= Name_uParent
6102 if not Has_Discriminants
(Typ
) then
6103 Error_Msg_Node_2
:= Typ
;
6104 Error_Msg_N
("& is not a component of}", Selectr
);
6107 ("& is not a component of the aggregate subtype",
6111 Check_Misspelled_Component
(Components
, Selectr
);
6114 elsif No
(Typech
) then
6115 Typech
:= Base_Type
(Etype
(Component
));
6117 -- AI05-0199: In Ada 2012, several components of anonymous
6118 -- access types can appear in a choice list, as long as the
6119 -- designated types match.
6121 elsif Typech
/= Base_Type
(Etype
(Component
)) then
6122 if Ada_Version
>= Ada_2012
6123 and then Ekind
(Typech
) = E_Anonymous_Access_Type
6125 Ekind
(Etype
(Component
)) = E_Anonymous_Access_Type
6126 and then Base_Type
(Designated_Type
(Typech
)) =
6127 Base_Type
(Designated_Type
(Etype
(Component
)))
6129 Subtypes_Statically_Match
(Typech
, (Etype
(Component
)))
6133 elsif not Box_Present
(Parent
(Selectr
)) then
6135 ("components in choice list must have same type",
6144 end loop Verification
;
6147 -- STEP 8: replace the original aggregate
6150 New_Aggregate
: constant Node_Id
:= New_Copy
(N
);
6153 Set_Expressions
(New_Aggregate
, No_List
);
6154 Set_Etype
(New_Aggregate
, Etype
(N
));
6155 Set_Component_Associations
(New_Aggregate
, New_Assoc_List
);
6156 Set_Check_Actuals
(New_Aggregate
, Check_Actuals
(N
));
6158 Rewrite
(N
, New_Aggregate
);
6161 -- Check the dimensions of the components in the record aggregate
6163 Analyze_Dimension_Extension_Or_Record_Aggregate
(N
);
6164 end Resolve_Record_Aggregate
;
6166 -----------------------------
6167 -- Check_Can_Never_Be_Null --
6168 -----------------------------
6170 procedure Check_Can_Never_Be_Null
(Typ
: Entity_Id
; Expr
: Node_Id
) is
6171 Comp_Typ
: Entity_Id
;
6175 (Ada_Version
>= Ada_2005
6176 and then Present
(Expr
)
6177 and then Known_Null
(Expr
));
6180 when E_Array_Type
=>
6181 Comp_Typ
:= Component_Type
(Typ
);
6186 Comp_Typ
:= Etype
(Typ
);
6192 if Can_Never_Be_Null
(Comp_Typ
) then
6194 -- Here we know we have a constraint error. Note that we do not use
6195 -- Apply_Compile_Time_Constraint_Error here to the Expr, which might
6196 -- seem the more natural approach. That's because in some cases the
6197 -- components are rewritten, and the replacement would be missed.
6198 -- We do not mark the whole aggregate as raising a constraint error,
6199 -- because the association may be a null array range.
6202 ("(Ada 2005) NULL not allowed in null-excluding component??", Expr
);
6204 ("\Constraint_Error will be raised at run time??", Expr
);
6207 Make_Raise_Constraint_Error
6208 (Sloc
(Expr
), Reason
=> CE_Access_Check_Failed
));
6209 Set_Etype
(Expr
, Comp_Typ
);
6210 Set_Analyzed
(Expr
);
6212 end Check_Can_Never_Be_Null
;
6214 ---------------------
6215 -- Sort_Case_Table --
6216 ---------------------
6218 procedure Sort_Case_Table
(Case_Table
: in out Case_Table_Type
) is
6219 U
: constant Int
:= Case_Table
'Last;
6227 T
:= Case_Table
(K
+ 1);
6231 and then Expr_Value
(Case_Table
(J
- 1).Lo
) > Expr_Value
(T
.Lo
)
6233 Case_Table
(J
) := Case_Table
(J
- 1);
6237 Case_Table
(J
) := T
;
6240 end Sort_Case_Table
;