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1 | ------------------------------------------------------------------------------ |
2 | -- -- | |
3 | -- GNAT COMPILER COMPONENTS -- | |
4 | -- -- | |
5 | -- S E M _ A G G R -- | |
6 | -- -- | |
7 | -- B o d y -- | |
8 | -- -- | |
22cb89b5 | 9 | -- Copyright (C) 1992-2010, Free Software Foundation, Inc. -- |
996ae0b0 RK |
10 | -- -- |
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- -- | |
157a9bf5 | 13 | -- ware Foundation; either version 3, or (at your option) any later ver- -- |
996ae0b0 RK |
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 -- | |
157a9bf5 ES |
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. -- | |
996ae0b0 RK |
20 | -- -- |
21 | -- GNAT was originally developed by the GNAT team at New York University. -- | |
71ff80dc | 22 | -- Extensive contributions were provided by Ada Core Technologies Inc. -- |
996ae0b0 RK |
23 | -- -- |
24 | ------------------------------------------------------------------------------ | |
25 | ||
26 | with Atree; use Atree; | |
27 | with Checks; use Checks; | |
28 | with Einfo; use Einfo; | |
29 | with Elists; use Elists; | |
30 | with Errout; use Errout; | |
4755cce9 | 31 | with Expander; use Expander; |
52739835 | 32 | with Exp_Tss; use Exp_Tss; |
996ae0b0 RK |
33 | with Exp_Util; use Exp_Util; |
34 | with Freeze; use Freeze; | |
35 | with Itypes; use Itypes; | |
c7ce71c2 | 36 | with Lib; use Lib; |
fbf5a39b | 37 | with Lib.Xref; use Lib.Xref; |
996ae0b0 | 38 | with Namet; use Namet; |
c80d4855 | 39 | with Namet.Sp; use Namet.Sp; |
996ae0b0 RK |
40 | with Nmake; use Nmake; |
41 | with Nlists; use Nlists; | |
42 | with Opt; use Opt; | |
43 | with Sem; use Sem; | |
a4100e55 | 44 | with Sem_Aux; use Sem_Aux; |
996ae0b0 | 45 | with Sem_Cat; use Sem_Cat; |
88b32fc3 | 46 | with Sem_Ch3; use Sem_Ch3; |
996ae0b0 RK |
47 | with Sem_Ch13; use Sem_Ch13; |
48 | with Sem_Eval; use Sem_Eval; | |
49 | with Sem_Res; use Sem_Res; | |
50 | with Sem_Util; use Sem_Util; | |
51 | with Sem_Type; use Sem_Type; | |
fbf5a39b | 52 | with Sem_Warn; use Sem_Warn; |
996ae0b0 RK |
53 | with Sinfo; use Sinfo; |
54 | with Snames; use Snames; | |
55 | with Stringt; use Stringt; | |
56 | with Stand; use Stand; | |
fbf5a39b | 57 | with Targparm; use Targparm; |
996ae0b0 RK |
58 | with Tbuild; use Tbuild; |
59 | with Uintp; use Uintp; | |
60 | ||
996ae0b0 RK |
61 | package body Sem_Aggr is |
62 | ||
63 | type Case_Bounds is record | |
64 | Choice_Lo : Node_Id; | |
65 | Choice_Hi : Node_Id; | |
66 | Choice_Node : Node_Id; | |
67 | end record; | |
68 | ||
69 | type Case_Table_Type is array (Nat range <>) of Case_Bounds; | |
70 | -- Table type used by Check_Case_Choices procedure | |
71 | ||
72 | ----------------------- | |
73 | -- Local Subprograms -- | |
74 | ----------------------- | |
75 | ||
76 | procedure Sort_Case_Table (Case_Table : in out Case_Table_Type); | |
77 | -- Sort the Case Table using the Lower Bound of each Choice as the key. | |
78 | -- A simple insertion sort is used since the number of choices in a case | |
79 | -- statement of variant part will usually be small and probably in near | |
80 | -- sorted order. | |
81 | ||
9b96e234 JM |
82 | procedure Check_Can_Never_Be_Null (Typ : Entity_Id; Expr : Node_Id); |
83 | -- Ada 2005 (AI-231): Check bad usage of null for a component for which | |
84 | -- null exclusion (NOT NULL) is specified. Typ can be an E_Array_Type for | |
85 | -- the array case (the component type of the array will be used) or an | |
86 | -- E_Component/E_Discriminant entity in the record case, in which case the | |
87 | -- type of the component will be used for the test. If Typ is any other | |
88 | -- kind of entity, the call is ignored. Expr is the component node in the | |
8133b9d1 | 89 | -- aggregate which is known to have a null value. A warning message will be |
9b96e234 JM |
90 | -- issued if the component is null excluding. |
91 | -- | |
92 | -- It would be better to pass the proper type for Typ ??? | |
2820d220 | 93 | |
ca44152f ES |
94 | procedure Check_Expr_OK_In_Limited_Aggregate (Expr : Node_Id); |
95 | -- Check that Expr is either not limited or else is one of the cases of | |
96 | -- expressions allowed for a limited component association (namely, an | |
97 | -- aggregate, function call, or <> notation). Report error for violations. | |
98 | ||
996ae0b0 RK |
99 | ------------------------------------------------------ |
100 | -- Subprograms used for RECORD AGGREGATE Processing -- | |
101 | ------------------------------------------------------ | |
102 | ||
103 | procedure Resolve_Record_Aggregate (N : Node_Id; Typ : Entity_Id); | |
104 | -- This procedure performs all the semantic checks required for record | |
105 | -- aggregates. Note that for aggregates analysis and resolution go | |
106 | -- hand in hand. Aggregate analysis has been delayed up to here and | |
107 | -- it is done while resolving the aggregate. | |
108 | -- | |
109 | -- N is the N_Aggregate node. | |
110 | -- Typ is the record type for the aggregate resolution | |
111 | -- | |
9b96e234 JM |
112 | -- While performing the semantic checks, this procedure builds a new |
113 | -- Component_Association_List where each record field appears alone in a | |
114 | -- Component_Choice_List along with its corresponding expression. The | |
115 | -- record fields in the Component_Association_List appear in the same order | |
116 | -- in which they appear in the record type Typ. | |
996ae0b0 | 117 | -- |
9b96e234 JM |
118 | -- Once this new Component_Association_List is built and all the semantic |
119 | -- checks performed, the original aggregate subtree is replaced with the | |
120 | -- new named record aggregate just built. Note that subtree substitution is | |
121 | -- performed with Rewrite so as to be able to retrieve the original | |
122 | -- aggregate. | |
996ae0b0 RK |
123 | -- |
124 | -- The aggregate subtree manipulation performed by Resolve_Record_Aggregate | |
125 | -- yields the aggregate format expected by Gigi. Typically, this kind of | |
126 | -- tree manipulations are done in the expander. However, because the | |
9b96e234 JM |
127 | -- semantic checks that need to be performed on record aggregates really go |
128 | -- hand in hand with the record aggregate normalization, the aggregate | |
996ae0b0 | 129 | -- subtree transformation is performed during resolution rather than |
9b96e234 JM |
130 | -- expansion. Had we decided otherwise we would have had to duplicate most |
131 | -- of the code in the expansion procedure Expand_Record_Aggregate. Note, | |
c7ce71c2 | 132 | -- however, that all the expansion concerning aggregates for tagged records |
9b96e234 | 133 | -- is done in Expand_Record_Aggregate. |
996ae0b0 RK |
134 | -- |
135 | -- The algorithm of Resolve_Record_Aggregate proceeds as follows: | |
136 | -- | |
137 | -- 1. Make sure that the record type against which the record aggregate | |
c9a1acdc AC |
138 | -- has to be resolved is not abstract. Furthermore if the type is a |
139 | -- null aggregate make sure the input aggregate N is also null. | |
996ae0b0 RK |
140 | -- |
141 | -- 2. Verify that the structure of the aggregate is that of a record | |
142 | -- aggregate. Specifically, look for component associations and ensure | |
143 | -- that each choice list only has identifiers or the N_Others_Choice | |
144 | -- node. Also make sure that if present, the N_Others_Choice occurs | |
145 | -- last and by itself. | |
146 | -- | |
c9a1acdc AC |
147 | -- 3. If Typ contains discriminants, the values for each discriminant is |
148 | -- looked for. If the record type Typ has variants, we check that the | |
149 | -- expressions corresponding to each discriminant ruling the (possibly | |
150 | -- nested) variant parts of Typ, are static. This allows us to determine | |
151 | -- the variant parts to which the rest of the aggregate must conform. | |
152 | -- The names of discriminants with their values are saved in a new | |
153 | -- association list, New_Assoc_List which is later augmented with the | |
154 | -- names and values of the remaining components in the record type. | |
996ae0b0 RK |
155 | -- |
156 | -- During this phase we also make sure that every discriminant is | |
c9a1acdc AC |
157 | -- assigned exactly one value. Note that when several values for a given |
158 | -- discriminant are found, semantic processing continues looking for | |
159 | -- further errors. In this case it's the first discriminant value found | |
160 | -- which we will be recorded. | |
996ae0b0 RK |
161 | -- |
162 | -- IMPORTANT NOTE: For derived tagged types this procedure expects | |
163 | -- First_Discriminant and Next_Discriminant to give the correct list | |
164 | -- of discriminants, in the correct order. | |
165 | -- | |
c9a1acdc AC |
166 | -- 4. After all the discriminant values have been gathered, we can set the |
167 | -- Etype of the record aggregate. If Typ contains no discriminants this | |
168 | -- is straightforward: the Etype of N is just Typ, otherwise a new | |
169 | -- implicit constrained subtype of Typ is built to be the Etype of N. | |
996ae0b0 RK |
170 | -- |
171 | -- 5. Gather the remaining record components according to the discriminant | |
172 | -- values. This involves recursively traversing the record type | |
173 | -- structure to see what variants are selected by the given discriminant | |
174 | -- values. This processing is a little more convoluted if Typ is a | |
175 | -- derived tagged types since we need to retrieve the record structure | |
176 | -- of all the ancestors of Typ. | |
177 | -- | |
c9a1acdc AC |
178 | -- 6. After gathering the record components we look for their values in the |
179 | -- record aggregate and emit appropriate error messages should we not | |
180 | -- find such values or should they be duplicated. | |
181 | -- | |
182 | -- 7. We then make sure no illegal component names appear in the record | |
183 | -- aggregate and make sure that the type of the record components | |
184 | -- appearing in a same choice list is the same. Finally we ensure that | |
185 | -- the others choice, if present, is used to provide the value of at | |
186 | -- least a record component. | |
187 | -- | |
188 | -- 8. The original aggregate node is replaced with the new named aggregate | |
189 | -- built in steps 3 through 6, as explained earlier. | |
190 | -- | |
191 | -- Given the complexity of record aggregate resolution, the primary goal of | |
192 | -- this routine is clarity and simplicity rather than execution and storage | |
193 | -- efficiency. If there are only positional components in the aggregate the | |
194 | -- running time is linear. If there are associations the running time is | |
195 | -- still linear as long as the order of the associations is not too far off | |
196 | -- the order of the components in the record type. If this is not the case | |
197 | -- the running time is at worst quadratic in the size of the association | |
198 | -- list. | |
996ae0b0 RK |
199 | |
200 | procedure Check_Misspelled_Component | |
9c290e69 PO |
201 | (Elements : Elist_Id; |
202 | Component : Node_Id); | |
c9a1acdc AC |
203 | -- Give possible misspelling diagnostic if Component is likely to be a |
204 | -- misspelling of one of the components of the Assoc_List. This is called | |
205 | -- by Resolve_Aggr_Expr after producing an invalid component error message. | |
996ae0b0 RK |
206 | |
207 | procedure Check_Static_Discriminated_Subtype (T : Entity_Id; V : Node_Id); | |
c9a1acdc AC |
208 | -- An optimization: determine whether a discriminated subtype has a static |
209 | -- constraint, and contains array components whose length is also static, | |
210 | -- either because they are constrained by the discriminant, or because the | |
211 | -- original component bounds are static. | |
996ae0b0 RK |
212 | |
213 | ----------------------------------------------------- | |
214 | -- Subprograms used for ARRAY AGGREGATE Processing -- | |
215 | ----------------------------------------------------- | |
216 | ||
217 | function Resolve_Array_Aggregate | |
218 | (N : Node_Id; | |
219 | Index : Node_Id; | |
220 | Index_Constr : Node_Id; | |
221 | Component_Typ : Entity_Id; | |
ca44152f | 222 | Others_Allowed : Boolean) return Boolean; |
996ae0b0 RK |
223 | -- This procedure performs the semantic checks for an array aggregate. |
224 | -- True is returned if the aggregate resolution succeeds. | |
ca44152f | 225 | -- |
996ae0b0 | 226 | -- The procedure works by recursively checking each nested aggregate. |
9f4fd324 | 227 | -- Specifically, after checking a sub-aggregate nested at the i-th level |
996ae0b0 RK |
228 | -- we recursively check all the subaggregates at the i+1-st level (if any). |
229 | -- Note that for aggregates analysis and resolution go hand in hand. | |
230 | -- Aggregate analysis has been delayed up to here and it is done while | |
231 | -- resolving the aggregate. | |
232 | -- | |
233 | -- N is the current N_Aggregate node to be checked. | |
234 | -- | |
235 | -- Index is the index node corresponding to the array sub-aggregate that | |
236 | -- we are currently checking (RM 4.3.3 (8)). Its Etype is the | |
237 | -- corresponding index type (or subtype). | |
238 | -- | |
239 | -- Index_Constr is the node giving the applicable index constraint if | |
240 | -- any (RM 4.3.3 (10)). It "is a constraint provided by certain | |
241 | -- contexts [...] that can be used to determine the bounds of the array | |
242 | -- value specified by the aggregate". If Others_Allowed below is False | |
243 | -- there is no applicable index constraint and this node is set to Index. | |
244 | -- | |
245 | -- Component_Typ is the array component type. | |
246 | -- | |
247 | -- Others_Allowed indicates whether an others choice is allowed | |
248 | -- in the context where the top-level aggregate appeared. | |
249 | -- | |
250 | -- The algorithm of Resolve_Array_Aggregate proceeds as follows: | |
251 | -- | |
252 | -- 1. Make sure that the others choice, if present, is by itself and | |
253 | -- appears last in the sub-aggregate. Check that we do not have | |
254 | -- positional and named components in the array sub-aggregate (unless | |
255 | -- the named association is an others choice). Finally if an others | |
12a13f01 | 256 | -- choice is present, make sure it is allowed in the aggregate context. |
996ae0b0 RK |
257 | -- |
258 | -- 2. If the array sub-aggregate contains discrete_choices: | |
259 | -- | |
260 | -- (A) Verify their validity. Specifically verify that: | |
261 | -- | |
262 | -- (a) If a null range is present it must be the only possible | |
263 | -- choice in the array aggregate. | |
264 | -- | |
265 | -- (b) Ditto for a non static range. | |
266 | -- | |
267 | -- (c) Ditto for a non static expression. | |
268 | -- | |
269 | -- In addition this step analyzes and resolves each discrete_choice, | |
270 | -- making sure that its type is the type of the corresponding Index. | |
271 | -- If we are not at the lowest array aggregate level (in the case of | |
272 | -- multi-dimensional aggregates) then invoke Resolve_Array_Aggregate | |
273 | -- recursively on each component expression. Otherwise, resolve the | |
274 | -- bottom level component expressions against the expected component | |
275 | -- type ONLY IF the component corresponds to a single discrete choice | |
276 | -- which is not an others choice (to see why read the DELAYED | |
277 | -- COMPONENT RESOLUTION below). | |
278 | -- | |
279 | -- (B) Determine the bounds of the sub-aggregate and lowest and | |
280 | -- highest choice values. | |
281 | -- | |
282 | -- 3. For positional aggregates: | |
283 | -- | |
284 | -- (A) Loop over the component expressions either recursively invoking | |
285 | -- Resolve_Array_Aggregate on each of these for multi-dimensional | |
286 | -- array aggregates or resolving the bottom level component | |
287 | -- expressions against the expected component type. | |
288 | -- | |
289 | -- (B) Determine the bounds of the positional sub-aggregates. | |
290 | -- | |
291 | -- 4. Try to determine statically whether the evaluation of the array | |
292 | -- sub-aggregate raises Constraint_Error. If yes emit proper | |
293 | -- warnings. The precise checks are the following: | |
294 | -- | |
295 | -- (A) Check that the index range defined by aggregate bounds is | |
296 | -- compatible with corresponding index subtype. | |
297 | -- We also check against the base type. In fact it could be that | |
298 | -- Low/High bounds of the base type are static whereas those of | |
299 | -- the index subtype are not. Thus if we can statically catch | |
300 | -- a problem with respect to the base type we are guaranteed | |
301 | -- that the same problem will arise with the index subtype | |
302 | -- | |
303 | -- (B) If we are dealing with a named aggregate containing an others | |
304 | -- choice and at least one discrete choice then make sure the range | |
305 | -- specified by the discrete choices does not overflow the | |
306 | -- aggregate bounds. We also check against the index type and base | |
307 | -- type bounds for the same reasons given in (A). | |
308 | -- | |
309 | -- (C) If we are dealing with a positional aggregate with an others | |
310 | -- choice make sure the number of positional elements specified | |
311 | -- does not overflow the aggregate bounds. We also check against | |
312 | -- the index type and base type bounds as mentioned in (A). | |
313 | -- | |
314 | -- Finally construct an N_Range node giving the sub-aggregate bounds. | |
315 | -- Set the Aggregate_Bounds field of the sub-aggregate to be this | |
316 | -- N_Range. The routine Array_Aggr_Subtype below uses such N_Ranges | |
317 | -- to build the appropriate aggregate subtype. Aggregate_Bounds | |
318 | -- information is needed during expansion. | |
319 | -- | |
320 | -- DELAYED COMPONENT RESOLUTION: The resolution of bottom level component | |
321 | -- expressions in an array aggregate may call Duplicate_Subexpr or some | |
322 | -- other routine that inserts code just outside the outermost aggregate. | |
323 | -- If the array aggregate contains discrete choices or an others choice, | |
324 | -- this may be wrong. Consider for instance the following example. | |
325 | -- | |
326 | -- type Rec is record | |
327 | -- V : Integer := 0; | |
328 | -- end record; | |
329 | -- | |
330 | -- type Acc_Rec is access Rec; | |
331 | -- Arr : array (1..3) of Acc_Rec := (1 .. 3 => new Rec); | |
332 | -- | |
333 | -- Then the transformation of "new Rec" that occurs during resolution | |
334 | -- entails the following code modifications | |
335 | -- | |
336 | -- P7b : constant Acc_Rec := new Rec; | |
fbf5a39b | 337 | -- RecIP (P7b.all); |
996ae0b0 RK |
338 | -- Arr : array (1..3) of Acc_Rec := (1 .. 3 => P7b); |
339 | -- | |
340 | -- This code transformation is clearly wrong, since we need to call | |
341 | -- "new Rec" for each of the 3 array elements. To avoid this problem we | |
342 | -- delay resolution of the components of non positional array aggregates | |
343 | -- to the expansion phase. As an optimization, if the discrete choice | |
344 | -- specifies a single value we do not delay resolution. | |
345 | ||
346 | function Array_Aggr_Subtype (N : Node_Id; Typ : Node_Id) return Entity_Id; | |
347 | -- This routine returns the type or subtype of an array aggregate. | |
348 | -- | |
349 | -- N is the array aggregate node whose type we return. | |
350 | -- | |
351 | -- Typ is the context type in which N occurs. | |
352 | -- | |
c45b6ae0 | 353 | -- This routine creates an implicit array subtype whose bounds are |
996ae0b0 RK |
354 | -- those defined by the aggregate. When this routine is invoked |
355 | -- Resolve_Array_Aggregate has already processed aggregate N. Thus the | |
356 | -- Aggregate_Bounds of each sub-aggregate, is an N_Range node giving the | |
c7ce71c2 | 357 | -- sub-aggregate bounds. When building the aggregate itype, this function |
996ae0b0 RK |
358 | -- traverses the array aggregate N collecting such Aggregate_Bounds and |
359 | -- constructs the proper array aggregate itype. | |
360 | -- | |
361 | -- Note that in the case of multidimensional aggregates each inner | |
362 | -- sub-aggregate corresponding to a given array dimension, may provide a | |
363 | -- different bounds. If it is possible to determine statically that | |
364 | -- some sub-aggregates corresponding to the same index do not have the | |
365 | -- same bounds, then a warning is emitted. If such check is not possible | |
366 | -- statically (because some sub-aggregate bounds are dynamic expressions) | |
367 | -- then this job is left to the expander. In all cases the particular | |
368 | -- bounds that this function will chose for a given dimension is the first | |
369 | -- N_Range node for a sub-aggregate corresponding to that dimension. | |
370 | -- | |
371 | -- Note that the Raises_Constraint_Error flag of an array aggregate | |
372 | -- whose evaluation is determined to raise CE by Resolve_Array_Aggregate, | |
373 | -- is set in Resolve_Array_Aggregate but the aggregate is not | |
374 | -- immediately replaced with a raise CE. In fact, Array_Aggr_Subtype must | |
375 | -- first construct the proper itype for the aggregate (Gigi needs | |
376 | -- this). After constructing the proper itype we will eventually replace | |
377 | -- the top-level aggregate with a raise CE (done in Resolve_Aggregate). | |
378 | -- Of course in cases such as: | |
379 | -- | |
380 | -- type Arr is array (integer range <>) of Integer; | |
381 | -- A : Arr := (positive range -1 .. 2 => 0); | |
382 | -- | |
383 | -- The bounds of the aggregate itype are cooked up to look reasonable | |
384 | -- (in this particular case the bounds will be 1 .. 2). | |
385 | ||
386 | procedure Aggregate_Constraint_Checks | |
387 | (Exp : Node_Id; | |
388 | Check_Typ : Entity_Id); | |
389 | -- Checks expression Exp against subtype Check_Typ. If Exp is an | |
390 | -- aggregate and Check_Typ a constrained record type with discriminants, | |
391 | -- we generate the appropriate discriminant checks. If Exp is an array | |
392 | -- aggregate then emit the appropriate length checks. If Exp is a scalar | |
393 | -- type, or a string literal, Exp is changed into Check_Typ'(Exp) to | |
394 | -- ensure that range checks are performed at run time. | |
395 | ||
396 | procedure Make_String_Into_Aggregate (N : Node_Id); | |
397 | -- A string literal can appear in a context in which a one dimensional | |
398 | -- array of characters is expected. This procedure simply rewrites the | |
399 | -- string as an aggregate, prior to resolution. | |
400 | ||
401 | --------------------------------- | |
402 | -- Aggregate_Constraint_Checks -- | |
403 | --------------------------------- | |
404 | ||
405 | procedure Aggregate_Constraint_Checks | |
406 | (Exp : Node_Id; | |
407 | Check_Typ : Entity_Id) | |
408 | is | |
409 | Exp_Typ : constant Entity_Id := Etype (Exp); | |
410 | ||
411 | begin | |
412 | if Raises_Constraint_Error (Exp) then | |
413 | return; | |
414 | end if; | |
415 | ||
33477fb7 ES |
416 | -- Ada 2005 (AI-230): Generate a conversion to an anonymous access |
417 | -- component's type to force the appropriate accessibility checks. | |
418 | ||
419 | -- Ada 2005 (AI-231): Generate conversion to the null-excluding | |
420 | -- type to force the corresponding run-time check | |
421 | ||
422 | if Is_Access_Type (Check_Typ) | |
423 | and then ((Is_Local_Anonymous_Access (Check_Typ)) | |
424 | or else (Can_Never_Be_Null (Check_Typ) | |
425 | and then not Can_Never_Be_Null (Exp_Typ))) | |
426 | then | |
427 | Rewrite (Exp, Convert_To (Check_Typ, Relocate_Node (Exp))); | |
428 | Analyze_And_Resolve (Exp, Check_Typ); | |
429 | Check_Unset_Reference (Exp); | |
430 | end if; | |
431 | ||
996ae0b0 RK |
432 | -- This is really expansion activity, so make sure that expansion |
433 | -- is on and is allowed. | |
434 | ||
ca44152f | 435 | if not Expander_Active or else In_Spec_Expression then |
996ae0b0 RK |
436 | return; |
437 | end if; | |
438 | ||
439 | -- First check if we have to insert discriminant checks | |
440 | ||
441 | if Has_Discriminants (Exp_Typ) then | |
442 | Apply_Discriminant_Check (Exp, Check_Typ); | |
443 | ||
444 | -- Next emit length checks for array aggregates | |
445 | ||
446 | elsif Is_Array_Type (Exp_Typ) then | |
447 | Apply_Length_Check (Exp, Check_Typ); | |
448 | ||
449 | -- Finally emit scalar and string checks. If we are dealing with a | |
450 | -- scalar literal we need to check by hand because the Etype of | |
451 | -- literals is not necessarily correct. | |
452 | ||
453 | elsif Is_Scalar_Type (Exp_Typ) | |
454 | and then Compile_Time_Known_Value (Exp) | |
455 | then | |
456 | if Is_Out_Of_Range (Exp, Base_Type (Check_Typ)) then | |
457 | Apply_Compile_Time_Constraint_Error | |
07fc65c4 | 458 | (Exp, "value not in range of}?", CE_Range_Check_Failed, |
996ae0b0 RK |
459 | Ent => Base_Type (Check_Typ), |
460 | Typ => Base_Type (Check_Typ)); | |
461 | ||
462 | elsif Is_Out_Of_Range (Exp, Check_Typ) then | |
463 | Apply_Compile_Time_Constraint_Error | |
07fc65c4 | 464 | (Exp, "value not in range of}?", CE_Range_Check_Failed, |
996ae0b0 RK |
465 | Ent => Check_Typ, |
466 | Typ => Check_Typ); | |
467 | ||
468 | elsif not Range_Checks_Suppressed (Check_Typ) then | |
469 | Apply_Scalar_Range_Check (Exp, Check_Typ); | |
470 | end if; | |
471 | ||
88b32fc3 BD |
472 | -- Verify that target type is also scalar, to prevent view anomalies |
473 | -- in instantiations. | |
474 | ||
996ae0b0 | 475 | elsif (Is_Scalar_Type (Exp_Typ) |
88b32fc3 BD |
476 | or else Nkind (Exp) = N_String_Literal) |
477 | and then Is_Scalar_Type (Check_Typ) | |
996ae0b0 RK |
478 | and then Exp_Typ /= Check_Typ |
479 | then | |
480 | if Is_Entity_Name (Exp) | |
481 | and then Ekind (Entity (Exp)) = E_Constant | |
482 | then | |
483 | -- If expression is a constant, it is worthwhile checking whether | |
484 | -- it is a bound of the type. | |
485 | ||
486 | if (Is_Entity_Name (Type_Low_Bound (Check_Typ)) | |
487 | and then Entity (Exp) = Entity (Type_Low_Bound (Check_Typ))) | |
488 | or else (Is_Entity_Name (Type_High_Bound (Check_Typ)) | |
489 | and then Entity (Exp) = Entity (Type_High_Bound (Check_Typ))) | |
490 | then | |
491 | return; | |
492 | ||
493 | else | |
494 | Rewrite (Exp, Convert_To (Check_Typ, Relocate_Node (Exp))); | |
495 | Analyze_And_Resolve (Exp, Check_Typ); | |
fbf5a39b | 496 | Check_Unset_Reference (Exp); |
996ae0b0 RK |
497 | end if; |
498 | else | |
499 | Rewrite (Exp, Convert_To (Check_Typ, Relocate_Node (Exp))); | |
500 | Analyze_And_Resolve (Exp, Check_Typ); | |
fbf5a39b | 501 | Check_Unset_Reference (Exp); |
996ae0b0 | 502 | end if; |
2820d220 | 503 | |
996ae0b0 RK |
504 | end if; |
505 | end Aggregate_Constraint_Checks; | |
506 | ||
507 | ------------------------ | |
508 | -- Array_Aggr_Subtype -- | |
509 | ------------------------ | |
510 | ||
511 | function Array_Aggr_Subtype | |
b87971f3 AC |
512 | (N : Node_Id; |
513 | Typ : Entity_Id) return Entity_Id | |
996ae0b0 RK |
514 | is |
515 | Aggr_Dimension : constant Pos := Number_Dimensions (Typ); | |
ec53a6da | 516 | -- Number of aggregate index dimensions |
996ae0b0 RK |
517 | |
518 | Aggr_Range : array (1 .. Aggr_Dimension) of Node_Id := (others => Empty); | |
ec53a6da | 519 | -- Constrained N_Range of each index dimension in our aggregate itype |
996ae0b0 RK |
520 | |
521 | Aggr_Low : array (1 .. Aggr_Dimension) of Node_Id := (others => Empty); | |
522 | Aggr_High : array (1 .. Aggr_Dimension) of Node_Id := (others => Empty); | |
ec53a6da | 523 | -- Low and High bounds for each index dimension in our aggregate itype |
996ae0b0 RK |
524 | |
525 | Is_Fully_Positional : Boolean := True; | |
526 | ||
527 | procedure Collect_Aggr_Bounds (N : Node_Id; Dim : Pos); | |
528 | -- N is an array (sub-)aggregate. Dim is the dimension corresponding to | |
529 | -- (sub-)aggregate N. This procedure collects the constrained N_Range | |
530 | -- nodes corresponding to each index dimension of our aggregate itype. | |
531 | -- These N_Range nodes are collected in Aggr_Range above. | |
ec53a6da | 532 | -- |
996ae0b0 RK |
533 | -- Likewise collect in Aggr_Low & Aggr_High above the low and high |
534 | -- bounds of each index dimension. If, when collecting, two bounds | |
535 | -- corresponding to the same dimension are static and found to differ, | |
536 | -- then emit a warning, and mark N as raising Constraint_Error. | |
537 | ||
538 | ------------------------- | |
539 | -- Collect_Aggr_Bounds -- | |
540 | ------------------------- | |
541 | ||
542 | procedure Collect_Aggr_Bounds (N : Node_Id; Dim : Pos) is | |
543 | This_Range : constant Node_Id := Aggregate_Bounds (N); | |
ec53a6da | 544 | -- The aggregate range node of this specific sub-aggregate |
996ae0b0 RK |
545 | |
546 | This_Low : constant Node_Id := Low_Bound (Aggregate_Bounds (N)); | |
547 | This_High : constant Node_Id := High_Bound (Aggregate_Bounds (N)); | |
ec53a6da | 548 | -- The aggregate bounds of this specific sub-aggregate |
996ae0b0 RK |
549 | |
550 | Assoc : Node_Id; | |
551 | Expr : Node_Id; | |
552 | ||
553 | begin | |
554 | -- Collect the first N_Range for a given dimension that you find. | |
555 | -- For a given dimension they must be all equal anyway. | |
556 | ||
557 | if No (Aggr_Range (Dim)) then | |
558 | Aggr_Low (Dim) := This_Low; | |
559 | Aggr_High (Dim) := This_High; | |
560 | Aggr_Range (Dim) := This_Range; | |
561 | ||
562 | else | |
563 | if Compile_Time_Known_Value (This_Low) then | |
564 | if not Compile_Time_Known_Value (Aggr_Low (Dim)) then | |
565 | Aggr_Low (Dim) := This_Low; | |
566 | ||
567 | elsif Expr_Value (This_Low) /= Expr_Value (Aggr_Low (Dim)) then | |
568 | Set_Raises_Constraint_Error (N); | |
bc49df98 | 569 | Error_Msg_N ("sub-aggregate low bound mismatch?", N); |
9b96e234 JM |
570 | Error_Msg_N |
571 | ("\Constraint_Error will be raised at run-time?", N); | |
996ae0b0 RK |
572 | end if; |
573 | end if; | |
574 | ||
575 | if Compile_Time_Known_Value (This_High) then | |
576 | if not Compile_Time_Known_Value (Aggr_High (Dim)) then | |
577 | Aggr_High (Dim) := This_High; | |
578 | ||
579 | elsif | |
580 | Expr_Value (This_High) /= Expr_Value (Aggr_High (Dim)) | |
581 | then | |
582 | Set_Raises_Constraint_Error (N); | |
bc49df98 | 583 | Error_Msg_N ("sub-aggregate high bound mismatch?", N); |
9b96e234 JM |
584 | Error_Msg_N |
585 | ("\Constraint_Error will be raised at run-time?", N); | |
996ae0b0 RK |
586 | end if; |
587 | end if; | |
588 | end if; | |
589 | ||
590 | if Dim < Aggr_Dimension then | |
591 | ||
592 | -- Process positional components | |
593 | ||
594 | if Present (Expressions (N)) then | |
595 | Expr := First (Expressions (N)); | |
596 | while Present (Expr) loop | |
597 | Collect_Aggr_Bounds (Expr, Dim + 1); | |
598 | Next (Expr); | |
599 | end loop; | |
600 | end if; | |
601 | ||
602 | -- Process component associations | |
603 | ||
604 | if Present (Component_Associations (N)) then | |
605 | Is_Fully_Positional := False; | |
606 | ||
607 | Assoc := First (Component_Associations (N)); | |
608 | while Present (Assoc) loop | |
609 | Expr := Expression (Assoc); | |
610 | Collect_Aggr_Bounds (Expr, Dim + 1); | |
611 | Next (Assoc); | |
612 | end loop; | |
613 | end if; | |
614 | end if; | |
615 | end Collect_Aggr_Bounds; | |
616 | ||
617 | -- Array_Aggr_Subtype variables | |
618 | ||
619 | Itype : Entity_Id; | |
b87971f3 | 620 | -- The final itype of the overall aggregate |
996ae0b0 | 621 | |
fbf5a39b | 622 | Index_Constraints : constant List_Id := New_List; |
ec53a6da | 623 | -- The list of index constraints of the aggregate itype |
996ae0b0 RK |
624 | |
625 | -- Start of processing for Array_Aggr_Subtype | |
626 | ||
627 | begin | |
b87971f3 AC |
628 | -- Make sure that the list of index constraints is properly attached to |
629 | -- the tree, and then collect the aggregate bounds. | |
996ae0b0 RK |
630 | |
631 | Set_Parent (Index_Constraints, N); | |
632 | Collect_Aggr_Bounds (N, 1); | |
633 | ||
ec53a6da | 634 | -- Build the list of constrained indices of our aggregate itype |
996ae0b0 RK |
635 | |
636 | for J in 1 .. Aggr_Dimension loop | |
637 | Create_Index : declare | |
fbf5a39b AC |
638 | Index_Base : constant Entity_Id := |
639 | Base_Type (Etype (Aggr_Range (J))); | |
996ae0b0 RK |
640 | Index_Typ : Entity_Id; |
641 | ||
642 | begin | |
8133b9d1 ES |
643 | -- Construct the Index subtype, and associate it with the range |
644 | -- construct that generates it. | |
996ae0b0 | 645 | |
8133b9d1 ES |
646 | Index_Typ := |
647 | Create_Itype (Subtype_Kind (Ekind (Index_Base)), Aggr_Range (J)); | |
996ae0b0 RK |
648 | |
649 | Set_Etype (Index_Typ, Index_Base); | |
650 | ||
651 | if Is_Character_Type (Index_Base) then | |
652 | Set_Is_Character_Type (Index_Typ); | |
653 | end if; | |
654 | ||
655 | Set_Size_Info (Index_Typ, (Index_Base)); | |
656 | Set_RM_Size (Index_Typ, RM_Size (Index_Base)); | |
657 | Set_First_Rep_Item (Index_Typ, First_Rep_Item (Index_Base)); | |
658 | Set_Scalar_Range (Index_Typ, Aggr_Range (J)); | |
659 | ||
660 | if Is_Discrete_Or_Fixed_Point_Type (Index_Typ) then | |
661 | Set_RM_Size (Index_Typ, UI_From_Int (Minimum_Size (Index_Typ))); | |
662 | end if; | |
663 | ||
664 | Set_Etype (Aggr_Range (J), Index_Typ); | |
665 | ||
666 | Append (Aggr_Range (J), To => Index_Constraints); | |
667 | end Create_Index; | |
668 | end loop; | |
669 | ||
670 | -- Now build the Itype | |
671 | ||
672 | Itype := Create_Itype (E_Array_Subtype, N); | |
673 | ||
b87971f3 AC |
674 | Set_First_Rep_Item (Itype, First_Rep_Item (Typ)); |
675 | Set_Convention (Itype, Convention (Typ)); | |
676 | Set_Depends_On_Private (Itype, Has_Private_Component (Typ)); | |
677 | Set_Etype (Itype, Base_Type (Typ)); | |
678 | Set_Has_Alignment_Clause (Itype, Has_Alignment_Clause (Typ)); | |
679 | Set_Is_Aliased (Itype, Is_Aliased (Typ)); | |
680 | Set_Depends_On_Private (Itype, Depends_On_Private (Typ)); | |
996ae0b0 | 681 | |
fbf5a39b AC |
682 | Copy_Suppress_Status (Index_Check, Typ, Itype); |
683 | Copy_Suppress_Status (Length_Check, Typ, Itype); | |
684 | ||
996ae0b0 RK |
685 | Set_First_Index (Itype, First (Index_Constraints)); |
686 | Set_Is_Constrained (Itype, True); | |
687 | Set_Is_Internal (Itype, True); | |
996ae0b0 RK |
688 | |
689 | -- A simple optimization: purely positional aggregates of static | |
b87971f3 AC |
690 | -- components should be passed to gigi unexpanded whenever possible, and |
691 | -- regardless of the staticness of the bounds themselves. Subsequent | |
692 | -- checks in exp_aggr verify that type is not packed, etc. | |
996ae0b0 | 693 | |
8133b9d1 ES |
694 | Set_Size_Known_At_Compile_Time (Itype, |
695 | Is_Fully_Positional | |
696 | and then Comes_From_Source (N) | |
697 | and then Size_Known_At_Compile_Time (Component_Type (Typ))); | |
996ae0b0 | 698 | |
b87971f3 AC |
699 | -- We always need a freeze node for a packed array subtype, so that we |
700 | -- can build the Packed_Array_Type corresponding to the subtype. If | |
701 | -- expansion is disabled, the packed array subtype is not built, and we | |
702 | -- must not generate a freeze node for the type, or else it will appear | |
703 | -- incomplete to gigi. | |
996ae0b0 | 704 | |
b87971f3 AC |
705 | if Is_Packed (Itype) |
706 | and then not In_Spec_Expression | |
996ae0b0 RK |
707 | and then Expander_Active |
708 | then | |
709 | Freeze_Itype (Itype, N); | |
710 | end if; | |
711 | ||
712 | return Itype; | |
713 | end Array_Aggr_Subtype; | |
714 | ||
715 | -------------------------------- | |
716 | -- Check_Misspelled_Component -- | |
717 | -------------------------------- | |
718 | ||
719 | procedure Check_Misspelled_Component | |
9c290e69 PO |
720 | (Elements : Elist_Id; |
721 | Component : Node_Id) | |
996ae0b0 RK |
722 | is |
723 | Max_Suggestions : constant := 2; | |
724 | ||
725 | Nr_Of_Suggestions : Natural := 0; | |
726 | Suggestion_1 : Entity_Id := Empty; | |
727 | Suggestion_2 : Entity_Id := Empty; | |
728 | Component_Elmt : Elmt_Id; | |
729 | ||
730 | begin | |
b87971f3 AC |
731 | -- All the components of List are matched against Component and a count |
732 | -- is maintained of possible misspellings. When at the end of the | |
733 | -- the analysis there are one or two (not more!) possible misspellings, | |
734 | -- these misspellings will be suggested as possible correction. | |
996ae0b0 | 735 | |
c80d4855 RD |
736 | Component_Elmt := First_Elmt (Elements); |
737 | while Nr_Of_Suggestions <= Max_Suggestions | |
738 | and then Present (Component_Elmt) | |
739 | loop | |
740 | if Is_Bad_Spelling_Of | |
741 | (Chars (Node (Component_Elmt)), | |
742 | Chars (Component)) | |
743 | then | |
744 | Nr_Of_Suggestions := Nr_Of_Suggestions + 1; | |
996ae0b0 | 745 | |
c80d4855 RD |
746 | case Nr_Of_Suggestions is |
747 | when 1 => Suggestion_1 := Node (Component_Elmt); | |
748 | when 2 => Suggestion_2 := Node (Component_Elmt); | |
749 | when others => exit; | |
750 | end case; | |
751 | end if; | |
996ae0b0 | 752 | |
c80d4855 RD |
753 | Next_Elmt (Component_Elmt); |
754 | end loop; | |
996ae0b0 | 755 | |
c80d4855 | 756 | -- Report at most two suggestions |
996ae0b0 | 757 | |
c80d4855 | 758 | if Nr_Of_Suggestions = 1 then |
4e7a4f6e | 759 | Error_Msg_NE -- CODEFIX |
c80d4855 | 760 | ("\possible misspelling of&", Component, Suggestion_1); |
996ae0b0 | 761 | |
c80d4855 RD |
762 | elsif Nr_Of_Suggestions = 2 then |
763 | Error_Msg_Node_2 := Suggestion_2; | |
4e7a4f6e | 764 | Error_Msg_NE -- CODEFIX |
c80d4855 RD |
765 | ("\possible misspelling of& or&", Component, Suggestion_1); |
766 | end if; | |
996ae0b0 RK |
767 | end Check_Misspelled_Component; |
768 | ||
ca44152f ES |
769 | ---------------------------------------- |
770 | -- Check_Expr_OK_In_Limited_Aggregate -- | |
771 | ---------------------------------------- | |
772 | ||
773 | procedure Check_Expr_OK_In_Limited_Aggregate (Expr : Node_Id) is | |
774 | begin | |
775 | if Is_Limited_Type (Etype (Expr)) | |
776 | and then Comes_From_Source (Expr) | |
777 | and then not In_Instance_Body | |
778 | then | |
2a31c32b | 779 | if not OK_For_Limited_Init (Etype (Expr), Expr) then |
ca44152f ES |
780 | Error_Msg_N ("initialization not allowed for limited types", Expr); |
781 | Explain_Limited_Type (Etype (Expr), Expr); | |
782 | end if; | |
783 | end if; | |
784 | end Check_Expr_OK_In_Limited_Aggregate; | |
785 | ||
996ae0b0 RK |
786 | ---------------------------------------- |
787 | -- Check_Static_Discriminated_Subtype -- | |
788 | ---------------------------------------- | |
789 | ||
790 | procedure Check_Static_Discriminated_Subtype (T : Entity_Id; V : Node_Id) is | |
791 | Disc : constant Entity_Id := First_Discriminant (T); | |
792 | Comp : Entity_Id; | |
793 | Ind : Entity_Id; | |
794 | ||
795 | begin | |
07fc65c4 | 796 | if Has_Record_Rep_Clause (T) then |
996ae0b0 RK |
797 | return; |
798 | ||
799 | elsif Present (Next_Discriminant (Disc)) then | |
800 | return; | |
801 | ||
802 | elsif Nkind (V) /= N_Integer_Literal then | |
803 | return; | |
804 | end if; | |
805 | ||
806 | Comp := First_Component (T); | |
996ae0b0 | 807 | while Present (Comp) loop |
996ae0b0 RK |
808 | if Is_Scalar_Type (Etype (Comp)) then |
809 | null; | |
810 | ||
811 | elsif Is_Private_Type (Etype (Comp)) | |
812 | and then Present (Full_View (Etype (Comp))) | |
813 | and then Is_Scalar_Type (Full_View (Etype (Comp))) | |
814 | then | |
815 | null; | |
816 | ||
817 | elsif Is_Array_Type (Etype (Comp)) then | |
996ae0b0 RK |
818 | if Is_Bit_Packed_Array (Etype (Comp)) then |
819 | return; | |
820 | end if; | |
821 | ||
822 | Ind := First_Index (Etype (Comp)); | |
996ae0b0 | 823 | while Present (Ind) loop |
996ae0b0 RK |
824 | if Nkind (Ind) /= N_Range |
825 | or else Nkind (Low_Bound (Ind)) /= N_Integer_Literal | |
826 | or else Nkind (High_Bound (Ind)) /= N_Integer_Literal | |
827 | then | |
828 | return; | |
829 | end if; | |
830 | ||
831 | Next_Index (Ind); | |
832 | end loop; | |
833 | ||
834 | else | |
835 | return; | |
836 | end if; | |
837 | ||
838 | Next_Component (Comp); | |
839 | end loop; | |
840 | ||
ec53a6da | 841 | -- On exit, all components have statically known sizes |
996ae0b0 RK |
842 | |
843 | Set_Size_Known_At_Compile_Time (T); | |
844 | end Check_Static_Discriminated_Subtype; | |
845 | ||
846 | -------------------------------- | |
847 | -- Make_String_Into_Aggregate -- | |
848 | -------------------------------- | |
849 | ||
850 | procedure Make_String_Into_Aggregate (N : Node_Id) is | |
fbf5a39b | 851 | Exprs : constant List_Id := New_List; |
996ae0b0 | 852 | Loc : constant Source_Ptr := Sloc (N); |
996ae0b0 RK |
853 | Str : constant String_Id := Strval (N); |
854 | Strlen : constant Nat := String_Length (Str); | |
fbf5a39b AC |
855 | C : Char_Code; |
856 | C_Node : Node_Id; | |
857 | New_N : Node_Id; | |
858 | P : Source_Ptr; | |
996ae0b0 RK |
859 | |
860 | begin | |
fbf5a39b | 861 | P := Loc + 1; |
996ae0b0 RK |
862 | for J in 1 .. Strlen loop |
863 | C := Get_String_Char (Str, J); | |
864 | Set_Character_Literal_Name (C); | |
865 | ||
82c80734 RD |
866 | C_Node := |
867 | Make_Character_Literal (P, | |
868 | Chars => Name_Find, | |
869 | Char_Literal_Value => UI_From_CC (C)); | |
996ae0b0 | 870 | Set_Etype (C_Node, Any_Character); |
996ae0b0 RK |
871 | Append_To (Exprs, C_Node); |
872 | ||
873 | P := P + 1; | |
b87971f3 | 874 | -- Something special for wide strings??? |
996ae0b0 RK |
875 | end loop; |
876 | ||
877 | New_N := Make_Aggregate (Loc, Expressions => Exprs); | |
878 | Set_Analyzed (New_N); | |
879 | Set_Etype (New_N, Any_Composite); | |
880 | ||
881 | Rewrite (N, New_N); | |
882 | end Make_String_Into_Aggregate; | |
883 | ||
884 | ----------------------- | |
885 | -- Resolve_Aggregate -- | |
886 | ----------------------- | |
887 | ||
888 | procedure Resolve_Aggregate (N : Node_Id; Typ : Entity_Id) is | |
889 | Pkind : constant Node_Kind := Nkind (Parent (N)); | |
890 | ||
891 | Aggr_Subtyp : Entity_Id; | |
892 | -- The actual aggregate subtype. This is not necessarily the same as Typ | |
893 | -- which is the subtype of the context in which the aggregate was found. | |
894 | ||
895 | begin | |
6d2a1120 RD |
896 | -- Ignore junk empty aggregate resulting from parser error |
897 | ||
898 | if No (Expressions (N)) | |
899 | and then No (Component_Associations (N)) | |
900 | and then not Null_Record_Present (N) | |
901 | then | |
902 | return; | |
903 | end if; | |
904 | ||
fbf5a39b | 905 | -- Check for aggregates not allowed in configurable run-time mode. |
b87971f3 AC |
906 | -- We allow all cases of aggregates that do not come from source, since |
907 | -- these are all assumed to be small (e.g. bounds of a string literal). | |
908 | -- We also allow aggregates of types we know to be small. | |
fbf5a39b AC |
909 | |
910 | if not Support_Aggregates_On_Target | |
911 | and then Comes_From_Source (N) | |
912 | and then (not Known_Static_Esize (Typ) or else Esize (Typ) > 64) | |
913 | then | |
914 | Error_Msg_CRT ("aggregate", N); | |
915 | end if; | |
996ae0b0 | 916 | |
0ab80019 | 917 | -- Ada 2005 (AI-287): Limited aggregates allowed |
19f0526a | 918 | |
88b32fc3 | 919 | if Is_Limited_Type (Typ) and then Ada_Version < Ada_05 then |
fbf5a39b AC |
920 | Error_Msg_N ("aggregate type cannot be limited", N); |
921 | Explain_Limited_Type (Typ, N); | |
996ae0b0 RK |
922 | |
923 | elsif Is_Class_Wide_Type (Typ) then | |
924 | Error_Msg_N ("type of aggregate cannot be class-wide", N); | |
925 | ||
926 | elsif Typ = Any_String | |
927 | or else Typ = Any_Composite | |
928 | then | |
929 | Error_Msg_N ("no unique type for aggregate", N); | |
930 | Set_Etype (N, Any_Composite); | |
931 | ||
932 | elsif Is_Array_Type (Typ) and then Null_Record_Present (N) then | |
933 | Error_Msg_N ("null record forbidden in array aggregate", N); | |
934 | ||
935 | elsif Is_Record_Type (Typ) then | |
936 | Resolve_Record_Aggregate (N, Typ); | |
937 | ||
938 | elsif Is_Array_Type (Typ) then | |
939 | ||
940 | -- First a special test, for the case of a positional aggregate | |
941 | -- of characters which can be replaced by a string literal. | |
ca44152f | 942 | |
b87971f3 AC |
943 | -- Do not perform this transformation if this was a string literal to |
944 | -- start with, whose components needed constraint checks, or if the | |
945 | -- component type is non-static, because it will require those checks | |
946 | -- and be transformed back into an aggregate. | |
996ae0b0 RK |
947 | |
948 | if Number_Dimensions (Typ) = 1 | |
ca44152f | 949 | and then Is_Standard_Character_Type (Component_Type (Typ)) |
996ae0b0 RK |
950 | and then No (Component_Associations (N)) |
951 | and then not Is_Limited_Composite (Typ) | |
952 | and then not Is_Private_Composite (Typ) | |
953 | and then not Is_Bit_Packed_Array (Typ) | |
954 | and then Nkind (Original_Node (Parent (N))) /= N_String_Literal | |
955 | and then Is_Static_Subtype (Component_Type (Typ)) | |
956 | then | |
957 | declare | |
958 | Expr : Node_Id; | |
959 | ||
960 | begin | |
961 | Expr := First (Expressions (N)); | |
962 | while Present (Expr) loop | |
963 | exit when Nkind (Expr) /= N_Character_Literal; | |
964 | Next (Expr); | |
965 | end loop; | |
966 | ||
967 | if No (Expr) then | |
968 | Start_String; | |
969 | ||
970 | Expr := First (Expressions (N)); | |
971 | while Present (Expr) loop | |
82c80734 | 972 | Store_String_Char (UI_To_CC (Char_Literal_Value (Expr))); |
996ae0b0 RK |
973 | Next (Expr); |
974 | end loop; | |
975 | ||
976 | Rewrite (N, | |
977 | Make_String_Literal (Sloc (N), End_String)); | |
978 | ||
979 | Analyze_And_Resolve (N, Typ); | |
980 | return; | |
981 | end if; | |
982 | end; | |
983 | end if; | |
984 | ||
985 | -- Here if we have a real aggregate to deal with | |
986 | ||
987 | Array_Aggregate : declare | |
988 | Aggr_Resolved : Boolean; | |
fbf5a39b AC |
989 | |
990 | Aggr_Typ : constant Entity_Id := Etype (Typ); | |
b87971f3 AC |
991 | -- This is the unconstrained array type, which is the type against |
992 | -- which the aggregate is to be resolved. Typ itself is the array | |
993 | -- type of the context which may not be the same subtype as the | |
994 | -- subtype for the final aggregate. | |
996ae0b0 RK |
995 | |
996 | begin | |
997 | -- In the following we determine whether an others choice is | |
998 | -- allowed inside the array aggregate. The test checks the context | |
999 | -- in which the array aggregate occurs. If the context does not | |
1000 | -- permit it, or the aggregate type is unconstrained, an others | |
1001 | -- choice is not allowed. | |
d8387153 ES |
1002 | |
1003 | -- If expansion is disabled (generic context, or semantics-only | |
b87971f3 AC |
1004 | -- mode) actual subtypes cannot be constructed, and the type of an |
1005 | -- object may be its unconstrained nominal type. However, if the | |
1006 | -- context is an assignment, we assume that "others" is allowed, | |
1007 | -- because the target of the assignment will have a constrained | |
1008 | -- subtype when fully compiled. | |
d8387153 | 1009 | |
996ae0b0 RK |
1010 | -- Note that there is no node for Explicit_Actual_Parameter. |
1011 | -- To test for this context we therefore have to test for node | |
1012 | -- N_Parameter_Association which itself appears only if there is a | |
1013 | -- formal parameter. Consequently we also need to test for | |
1014 | -- N_Procedure_Call_Statement or N_Function_Call. | |
1015 | ||
b87971f3 | 1016 | Set_Etype (N, Aggr_Typ); -- May be overridden later on |
c45b6ae0 | 1017 | |
996ae0b0 RK |
1018 | if Is_Constrained (Typ) and then |
1019 | (Pkind = N_Assignment_Statement or else | |
1020 | Pkind = N_Parameter_Association or else | |
1021 | Pkind = N_Function_Call or else | |
1022 | Pkind = N_Procedure_Call_Statement or else | |
1023 | Pkind = N_Generic_Association or else | |
1024 | Pkind = N_Formal_Object_Declaration or else | |
8133b9d1 | 1025 | Pkind = N_Simple_Return_Statement or else |
996ae0b0 RK |
1026 | Pkind = N_Object_Declaration or else |
1027 | Pkind = N_Component_Declaration or else | |
1028 | Pkind = N_Parameter_Specification or else | |
1029 | Pkind = N_Qualified_Expression or else | |
1030 | Pkind = N_Aggregate or else | |
1031 | Pkind = N_Extension_Aggregate or else | |
1032 | Pkind = N_Component_Association) | |
1033 | then | |
1034 | Aggr_Resolved := | |
1035 | Resolve_Array_Aggregate | |
1036 | (N, | |
1037 | Index => First_Index (Aggr_Typ), | |
1038 | Index_Constr => First_Index (Typ), | |
1039 | Component_Typ => Component_Type (Typ), | |
1040 | Others_Allowed => True); | |
1041 | ||
d8387153 ES |
1042 | elsif not Expander_Active |
1043 | and then Pkind = N_Assignment_Statement | |
1044 | then | |
1045 | Aggr_Resolved := | |
1046 | Resolve_Array_Aggregate | |
1047 | (N, | |
1048 | Index => First_Index (Aggr_Typ), | |
1049 | Index_Constr => First_Index (Typ), | |
1050 | Component_Typ => Component_Type (Typ), | |
1051 | Others_Allowed => True); | |
996ae0b0 RK |
1052 | else |
1053 | Aggr_Resolved := | |
1054 | Resolve_Array_Aggregate | |
1055 | (N, | |
1056 | Index => First_Index (Aggr_Typ), | |
1057 | Index_Constr => First_Index (Aggr_Typ), | |
1058 | Component_Typ => Component_Type (Typ), | |
1059 | Others_Allowed => False); | |
1060 | end if; | |
1061 | ||
1062 | if not Aggr_Resolved then | |
1063 | Aggr_Subtyp := Any_Composite; | |
1064 | else | |
1065 | Aggr_Subtyp := Array_Aggr_Subtype (N, Typ); | |
1066 | end if; | |
1067 | ||
1068 | Set_Etype (N, Aggr_Subtyp); | |
1069 | end Array_Aggregate; | |
1070 | ||
d8387153 ES |
1071 | elsif Is_Private_Type (Typ) |
1072 | and then Present (Full_View (Typ)) | |
1073 | and then In_Inlined_Body | |
1074 | and then Is_Composite_Type (Full_View (Typ)) | |
1075 | then | |
1076 | Resolve (N, Full_View (Typ)); | |
1077 | ||
996ae0b0 RK |
1078 | else |
1079 | Error_Msg_N ("illegal context for aggregate", N); | |
996ae0b0 RK |
1080 | end if; |
1081 | ||
b87971f3 AC |
1082 | -- If we can determine statically that the evaluation of the aggregate |
1083 | -- raises Constraint_Error, then replace the aggregate with an | |
1084 | -- N_Raise_Constraint_Error node, but set the Etype to the right | |
1085 | -- aggregate subtype. Gigi needs this. | |
996ae0b0 RK |
1086 | |
1087 | if Raises_Constraint_Error (N) then | |
1088 | Aggr_Subtyp := Etype (N); | |
07fc65c4 GB |
1089 | Rewrite (N, |
1090 | Make_Raise_Constraint_Error (Sloc (N), | |
1091 | Reason => CE_Range_Check_Failed)); | |
996ae0b0 RK |
1092 | Set_Raises_Constraint_Error (N); |
1093 | Set_Etype (N, Aggr_Subtyp); | |
1094 | Set_Analyzed (N); | |
1095 | end if; | |
996ae0b0 RK |
1096 | end Resolve_Aggregate; |
1097 | ||
1098 | ----------------------------- | |
1099 | -- Resolve_Array_Aggregate -- | |
1100 | ----------------------------- | |
1101 | ||
1102 | function Resolve_Array_Aggregate | |
1103 | (N : Node_Id; | |
1104 | Index : Node_Id; | |
1105 | Index_Constr : Node_Id; | |
1106 | Component_Typ : Entity_Id; | |
ca44152f | 1107 | Others_Allowed : Boolean) return Boolean |
996ae0b0 RK |
1108 | is |
1109 | Loc : constant Source_Ptr := Sloc (N); | |
1110 | ||
1111 | Failure : constant Boolean := False; | |
1112 | Success : constant Boolean := True; | |
1113 | ||
1114 | Index_Typ : constant Entity_Id := Etype (Index); | |
1115 | Index_Typ_Low : constant Node_Id := Type_Low_Bound (Index_Typ); | |
1116 | Index_Typ_High : constant Node_Id := Type_High_Bound (Index_Typ); | |
b87971f3 AC |
1117 | -- The type of the index corresponding to the array sub-aggregate along |
1118 | -- with its low and upper bounds. | |
996ae0b0 RK |
1119 | |
1120 | Index_Base : constant Entity_Id := Base_Type (Index_Typ); | |
1121 | Index_Base_Low : constant Node_Id := Type_Low_Bound (Index_Base); | |
1122 | Index_Base_High : constant Node_Id := Type_High_Bound (Index_Base); | |
b87971f3 | 1123 | -- Ditto for the base type |
996ae0b0 RK |
1124 | |
1125 | function Add (Val : Uint; To : Node_Id) return Node_Id; | |
1126 | -- Creates a new expression node where Val is added to expression To. | |
1127 | -- Tries to constant fold whenever possible. To must be an already | |
1128 | -- analyzed expression. | |
1129 | ||
1130 | procedure Check_Bound (BH : Node_Id; AH : in out Node_Id); | |
1131 | -- Checks that AH (the upper bound of an array aggregate) is <= BH | |
1132 | -- (the upper bound of the index base type). If the check fails a | |
b87971f3 | 1133 | -- warning is emitted, the Raises_Constraint_Error flag of N is set, |
996ae0b0 RK |
1134 | -- and AH is replaced with a duplicate of BH. |
1135 | ||
1136 | procedure Check_Bounds (L, H : Node_Id; AL, AH : Node_Id); | |
1137 | -- Checks that range AL .. AH is compatible with range L .. H. Emits a | |
b87971f3 | 1138 | -- warning if not and sets the Raises_Constraint_Error flag in N. |
996ae0b0 RK |
1139 | |
1140 | procedure Check_Length (L, H : Node_Id; Len : Uint); | |
1141 | -- Checks that range L .. H contains at least Len elements. Emits a | |
b87971f3 | 1142 | -- warning if not and sets the Raises_Constraint_Error flag in N. |
996ae0b0 RK |
1143 | |
1144 | function Dynamic_Or_Null_Range (L, H : Node_Id) return Boolean; | |
ec53a6da | 1145 | -- Returns True if range L .. H is dynamic or null |
996ae0b0 RK |
1146 | |
1147 | procedure Get (Value : out Uint; From : Node_Id; OK : out Boolean); | |
1148 | -- Given expression node From, this routine sets OK to False if it | |
1149 | -- cannot statically evaluate From. Otherwise it stores this static | |
1150 | -- value into Value. | |
1151 | ||
1152 | function Resolve_Aggr_Expr | |
1153 | (Expr : Node_Id; | |
ca44152f | 1154 | Single_Elmt : Boolean) return Boolean; |
12a13f01 | 1155 | -- Resolves aggregate expression Expr. Returns False if resolution |
996ae0b0 | 1156 | -- fails. If Single_Elmt is set to False, the expression Expr may be |
b87971f3 AC |
1157 | -- used to initialize several array aggregate elements (this can happen |
1158 | -- for discrete choices such as "L .. H => Expr" or the others choice). | |
1159 | -- In this event we do not resolve Expr unless expansion is disabled. | |
1160 | -- To know why, see the DELAYED COMPONENT RESOLUTION note above. | |
996ae0b0 RK |
1161 | |
1162 | --------- | |
1163 | -- Add -- | |
1164 | --------- | |
1165 | ||
1166 | function Add (Val : Uint; To : Node_Id) return Node_Id is | |
1167 | Expr_Pos : Node_Id; | |
1168 | Expr : Node_Id; | |
1169 | To_Pos : Node_Id; | |
1170 | ||
1171 | begin | |
1172 | if Raises_Constraint_Error (To) then | |
1173 | return To; | |
1174 | end if; | |
1175 | ||
1176 | -- First test if we can do constant folding | |
1177 | ||
1178 | if Compile_Time_Known_Value (To) | |
1179 | or else Nkind (To) = N_Integer_Literal | |
1180 | then | |
1181 | Expr_Pos := Make_Integer_Literal (Loc, Expr_Value (To) + Val); | |
1182 | Set_Is_Static_Expression (Expr_Pos); | |
1183 | Set_Etype (Expr_Pos, Etype (To)); | |
1184 | Set_Analyzed (Expr_Pos, Analyzed (To)); | |
1185 | ||
1186 | if not Is_Enumeration_Type (Index_Typ) then | |
1187 | Expr := Expr_Pos; | |
1188 | ||
1189 | -- If we are dealing with enumeration return | |
1190 | -- Index_Typ'Val (Expr_Pos) | |
1191 | ||
1192 | else | |
1193 | Expr := | |
1194 | Make_Attribute_Reference | |
1195 | (Loc, | |
1196 | Prefix => New_Reference_To (Index_Typ, Loc), | |
1197 | Attribute_Name => Name_Val, | |
1198 | Expressions => New_List (Expr_Pos)); | |
1199 | end if; | |
1200 | ||
1201 | return Expr; | |
1202 | end if; | |
1203 | ||
1204 | -- If we are here no constant folding possible | |
1205 | ||
1206 | if not Is_Enumeration_Type (Index_Base) then | |
1207 | Expr := | |
1208 | Make_Op_Add (Loc, | |
1209 | Left_Opnd => Duplicate_Subexpr (To), | |
1210 | Right_Opnd => Make_Integer_Literal (Loc, Val)); | |
1211 | ||
1212 | -- If we are dealing with enumeration return | |
1213 | -- Index_Typ'Val (Index_Typ'Pos (To) + Val) | |
1214 | ||
1215 | else | |
1216 | To_Pos := | |
1217 | Make_Attribute_Reference | |
1218 | (Loc, | |
1219 | Prefix => New_Reference_To (Index_Typ, Loc), | |
1220 | Attribute_Name => Name_Pos, | |
1221 | Expressions => New_List (Duplicate_Subexpr (To))); | |
1222 | ||
1223 | Expr_Pos := | |
1224 | Make_Op_Add (Loc, | |
1225 | Left_Opnd => To_Pos, | |
1226 | Right_Opnd => Make_Integer_Literal (Loc, Val)); | |
1227 | ||
1228 | Expr := | |
1229 | Make_Attribute_Reference | |
1230 | (Loc, | |
1231 | Prefix => New_Reference_To (Index_Typ, Loc), | |
1232 | Attribute_Name => Name_Val, | |
1233 | Expressions => New_List (Expr_Pos)); | |
1234 | end if; | |
1235 | ||
1236 | return Expr; | |
1237 | end Add; | |
1238 | ||
1239 | ----------------- | |
1240 | -- Check_Bound -- | |
1241 | ----------------- | |
1242 | ||
1243 | procedure Check_Bound (BH : Node_Id; AH : in out Node_Id) is | |
1244 | Val_BH : Uint; | |
1245 | Val_AH : Uint; | |
1246 | ||
1247 | OK_BH : Boolean; | |
1248 | OK_AH : Boolean; | |
1249 | ||
1250 | begin | |
1251 | Get (Value => Val_BH, From => BH, OK => OK_BH); | |
1252 | Get (Value => Val_AH, From => AH, OK => OK_AH); | |
1253 | ||
1254 | if OK_BH and then OK_AH and then Val_BH < Val_AH then | |
1255 | Set_Raises_Constraint_Error (N); | |
1256 | Error_Msg_N ("upper bound out of range?", AH); | |
9b96e234 | 1257 | Error_Msg_N ("\Constraint_Error will be raised at run-time?", AH); |
996ae0b0 RK |
1258 | |
1259 | -- You need to set AH to BH or else in the case of enumerations | |
1260 | -- indices we will not be able to resolve the aggregate bounds. | |
1261 | ||
1262 | AH := Duplicate_Subexpr (BH); | |
1263 | end if; | |
1264 | end Check_Bound; | |
1265 | ||
1266 | ------------------ | |
1267 | -- Check_Bounds -- | |
1268 | ------------------ | |
1269 | ||
1270 | procedure Check_Bounds (L, H : Node_Id; AL, AH : Node_Id) is | |
1271 | Val_L : Uint; | |
1272 | Val_H : Uint; | |
1273 | Val_AL : Uint; | |
1274 | Val_AH : Uint; | |
1275 | ||
f91e8020 GD |
1276 | OK_L : Boolean; |
1277 | OK_H : Boolean; | |
1278 | ||
996ae0b0 | 1279 | OK_AL : Boolean; |
f91e8020 GD |
1280 | OK_AH : Boolean; |
1281 | pragma Warnings (Off, OK_AL); | |
1282 | pragma Warnings (Off, OK_AH); | |
996ae0b0 RK |
1283 | |
1284 | begin | |
1285 | if Raises_Constraint_Error (N) | |
1286 | or else Dynamic_Or_Null_Range (AL, AH) | |
1287 | then | |
1288 | return; | |
1289 | end if; | |
1290 | ||
1291 | Get (Value => Val_L, From => L, OK => OK_L); | |
1292 | Get (Value => Val_H, From => H, OK => OK_H); | |
1293 | ||
1294 | Get (Value => Val_AL, From => AL, OK => OK_AL); | |
1295 | Get (Value => Val_AH, From => AH, OK => OK_AH); | |
1296 | ||
1297 | if OK_L and then Val_L > Val_AL then | |
1298 | Set_Raises_Constraint_Error (N); | |
1299 | Error_Msg_N ("lower bound of aggregate out of range?", N); | |
fbf5a39b | 1300 | Error_Msg_N ("\Constraint_Error will be raised at run-time?", N); |
996ae0b0 RK |
1301 | end if; |
1302 | ||
1303 | if OK_H and then Val_H < Val_AH then | |
1304 | Set_Raises_Constraint_Error (N); | |
1305 | Error_Msg_N ("upper bound of aggregate out of range?", N); | |
fbf5a39b | 1306 | Error_Msg_N ("\Constraint_Error will be raised at run-time?", N); |
996ae0b0 RK |
1307 | end if; |
1308 | end Check_Bounds; | |
1309 | ||
1310 | ------------------ | |
1311 | -- Check_Length -- | |
1312 | ------------------ | |
1313 | ||
1314 | procedure Check_Length (L, H : Node_Id; Len : Uint) is | |
1315 | Val_L : Uint; | |
1316 | Val_H : Uint; | |
1317 | ||
1318 | OK_L : Boolean; | |
1319 | OK_H : Boolean; | |
1320 | ||
1321 | Range_Len : Uint; | |
1322 | ||
1323 | begin | |
1324 | if Raises_Constraint_Error (N) then | |
1325 | return; | |
1326 | end if; | |
1327 | ||
1328 | Get (Value => Val_L, From => L, OK => OK_L); | |
1329 | Get (Value => Val_H, From => H, OK => OK_H); | |
1330 | ||
1331 | if not OK_L or else not OK_H then | |
1332 | return; | |
1333 | end if; | |
1334 | ||
1335 | -- If null range length is zero | |
1336 | ||
1337 | if Val_L > Val_H then | |
1338 | Range_Len := Uint_0; | |
1339 | else | |
1340 | Range_Len := Val_H - Val_L + 1; | |
1341 | end if; | |
1342 | ||
1343 | if Range_Len < Len then | |
1344 | Set_Raises_Constraint_Error (N); | |
bc49df98 | 1345 | Error_Msg_N ("too many elements?", N); |
9b96e234 | 1346 | Error_Msg_N ("\Constraint_Error will be raised at run-time?", N); |
996ae0b0 RK |
1347 | end if; |
1348 | end Check_Length; | |
1349 | ||
1350 | --------------------------- | |
1351 | -- Dynamic_Or_Null_Range -- | |
1352 | --------------------------- | |
1353 | ||
1354 | function Dynamic_Or_Null_Range (L, H : Node_Id) return Boolean is | |
1355 | Val_L : Uint; | |
1356 | Val_H : Uint; | |
1357 | ||
1358 | OK_L : Boolean; | |
1359 | OK_H : Boolean; | |
1360 | ||
1361 | begin | |
1362 | Get (Value => Val_L, From => L, OK => OK_L); | |
1363 | Get (Value => Val_H, From => H, OK => OK_H); | |
1364 | ||
1365 | return not OK_L or else not OK_H | |
1366 | or else not Is_OK_Static_Expression (L) | |
1367 | or else not Is_OK_Static_Expression (H) | |
1368 | or else Val_L > Val_H; | |
1369 | end Dynamic_Or_Null_Range; | |
1370 | ||
1371 | --------- | |
1372 | -- Get -- | |
1373 | --------- | |
1374 | ||
1375 | procedure Get (Value : out Uint; From : Node_Id; OK : out Boolean) is | |
1376 | begin | |
1377 | OK := True; | |
1378 | ||
1379 | if Compile_Time_Known_Value (From) then | |
1380 | Value := Expr_Value (From); | |
1381 | ||
1382 | -- If expression From is something like Some_Type'Val (10) then | |
1383 | -- Value = 10 | |
1384 | ||
1385 | elsif Nkind (From) = N_Attribute_Reference | |
1386 | and then Attribute_Name (From) = Name_Val | |
1387 | and then Compile_Time_Known_Value (First (Expressions (From))) | |
1388 | then | |
1389 | Value := Expr_Value (First (Expressions (From))); | |
1390 | ||
1391 | else | |
1392 | Value := Uint_0; | |
1393 | OK := False; | |
1394 | end if; | |
1395 | end Get; | |
1396 | ||
1397 | ----------------------- | |
1398 | -- Resolve_Aggr_Expr -- | |
1399 | ----------------------- | |
1400 | ||
1401 | function Resolve_Aggr_Expr | |
1402 | (Expr : Node_Id; | |
ca44152f | 1403 | Single_Elmt : Boolean) return Boolean |
996ae0b0 | 1404 | is |
fbf5a39b AC |
1405 | Nxt_Ind : constant Node_Id := Next_Index (Index); |
1406 | Nxt_Ind_Constr : constant Node_Id := Next_Index (Index_Constr); | |
12a13f01 | 1407 | -- Index is the current index corresponding to the expression |
996ae0b0 RK |
1408 | |
1409 | Resolution_OK : Boolean := True; | |
ec53a6da | 1410 | -- Set to False if resolution of the expression failed |
996ae0b0 RK |
1411 | |
1412 | begin | |
1413 | -- If the array type against which we are resolving the aggregate | |
1414 | -- has several dimensions, the expressions nested inside the | |
1415 | -- aggregate must be further aggregates (or strings). | |
1416 | ||
1417 | if Present (Nxt_Ind) then | |
1418 | if Nkind (Expr) /= N_Aggregate then | |
1419 | ||
1420 | -- A string literal can appear where a one-dimensional array | |
1421 | -- of characters is expected. If the literal looks like an | |
1422 | -- operator, it is still an operator symbol, which will be | |
1423 | -- transformed into a string when analyzed. | |
1424 | ||
1425 | if Is_Character_Type (Component_Typ) | |
1426 | and then No (Next_Index (Nxt_Ind)) | |
f53f9dd7 | 1427 | and then Nkind_In (Expr, N_String_Literal, N_Operator_Symbol) |
996ae0b0 RK |
1428 | then |
1429 | -- A string literal used in a multidimensional array | |
1430 | -- aggregate in place of the final one-dimensional | |
1431 | -- aggregate must not be enclosed in parentheses. | |
1432 | ||
1433 | if Paren_Count (Expr) /= 0 then | |
ed2233dc | 1434 | Error_Msg_N ("no parenthesis allowed here", Expr); |
996ae0b0 RK |
1435 | end if; |
1436 | ||
1437 | Make_String_Into_Aggregate (Expr); | |
1438 | ||
1439 | else | |
1440 | Error_Msg_N ("nested array aggregate expected", Expr); | |
9d0c3761 AC |
1441 | |
1442 | -- If the expression is parenthesized, this may be | |
1443 | -- a missing component association for a 1-aggregate. | |
1444 | ||
1445 | if Paren_Count (Expr) > 0 then | |
ed2233dc | 1446 | Error_Msg_N |
22cb89b5 AC |
1447 | ("\if single-component aggregate is intended," |
1448 | & " write e.g. (1 ='> ...)", Expr); | |
9d0c3761 | 1449 | end if; |
996ae0b0 RK |
1450 | return Failure; |
1451 | end if; | |
1452 | end if; | |
1453 | ||
0ab80019 | 1454 | -- Ada 2005 (AI-231): Propagate the type to the nested aggregate. |
35b7fa6a AC |
1455 | -- Required to check the null-exclusion attribute (if present). |
1456 | -- This value may be overridden later on. | |
1457 | ||
1458 | Set_Etype (Expr, Etype (N)); | |
1459 | ||
996ae0b0 RK |
1460 | Resolution_OK := Resolve_Array_Aggregate |
1461 | (Expr, Nxt_Ind, Nxt_Ind_Constr, Component_Typ, Others_Allowed); | |
1462 | ||
1463 | -- Do not resolve the expressions of discrete or others choices | |
1464 | -- unless the expression covers a single component, or the expander | |
1465 | -- is inactive. | |
1466 | ||
1467 | elsif Single_Elmt | |
1468 | or else not Expander_Active | |
ca44152f | 1469 | or else In_Spec_Expression |
996ae0b0 RK |
1470 | then |
1471 | Analyze_And_Resolve (Expr, Component_Typ); | |
ca44152f | 1472 | Check_Expr_OK_In_Limited_Aggregate (Expr); |
996ae0b0 RK |
1473 | Check_Non_Static_Context (Expr); |
1474 | Aggregate_Constraint_Checks (Expr, Component_Typ); | |
fbf5a39b | 1475 | Check_Unset_Reference (Expr); |
996ae0b0 RK |
1476 | end if; |
1477 | ||
1478 | if Raises_Constraint_Error (Expr) | |
1479 | and then Nkind (Parent (Expr)) /= N_Component_Association | |
1480 | then | |
1481 | Set_Raises_Constraint_Error (N); | |
1482 | end if; | |
1483 | ||
d79e621a GD |
1484 | -- If the expression has been marked as requiring a range check, |
1485 | -- then generate it here. | |
1486 | ||
1487 | if Do_Range_Check (Expr) then | |
1488 | Set_Do_Range_Check (Expr, False); | |
1489 | Generate_Range_Check (Expr, Component_Typ, CE_Range_Check_Failed); | |
1490 | end if; | |
1491 | ||
996ae0b0 RK |
1492 | return Resolution_OK; |
1493 | end Resolve_Aggr_Expr; | |
1494 | ||
1495 | -- Variables local to Resolve_Array_Aggregate | |
1496 | ||
1497 | Assoc : Node_Id; | |
1498 | Choice : Node_Id; | |
1499 | Expr : Node_Id; | |
1500 | ||
f91e8020 GD |
1501 | Discard : Node_Id; |
1502 | pragma Warnings (Off, Discard); | |
996ae0b0 RK |
1503 | |
1504 | Aggr_Low : Node_Id := Empty; | |
1505 | Aggr_High : Node_Id := Empty; | |
c7ce71c2 | 1506 | -- The actual low and high bounds of this sub-aggregate |
996ae0b0 RK |
1507 | |
1508 | Choices_Low : Node_Id := Empty; | |
1509 | Choices_High : Node_Id := Empty; | |
1510 | -- The lowest and highest discrete choices values for a named aggregate | |
1511 | ||
1512 | Nb_Elements : Uint := Uint_0; | |
c7ce71c2 | 1513 | -- The number of elements in a positional aggregate |
996ae0b0 RK |
1514 | |
1515 | Others_Present : Boolean := False; | |
1516 | ||
1517 | Nb_Choices : Nat := 0; | |
1518 | -- Contains the overall number of named choices in this sub-aggregate | |
1519 | ||
1520 | Nb_Discrete_Choices : Nat := 0; | |
1521 | -- The overall number of discrete choices (not counting others choice) | |
1522 | ||
1523 | Case_Table_Size : Nat; | |
1524 | -- Contains the size of the case table needed to sort aggregate choices | |
1525 | ||
1526 | -- Start of processing for Resolve_Array_Aggregate | |
1527 | ||
1528 | begin | |
6d2a1120 RD |
1529 | -- Ignore junk empty aggregate resulting from parser error |
1530 | ||
1531 | if No (Expressions (N)) | |
1532 | and then No (Component_Associations (N)) | |
1533 | and then not Null_Record_Present (N) | |
1534 | then | |
1535 | return False; | |
1536 | end if; | |
1537 | ||
996ae0b0 RK |
1538 | -- STEP 1: make sure the aggregate is correctly formatted |
1539 | ||
1540 | if Present (Component_Associations (N)) then | |
1541 | Assoc := First (Component_Associations (N)); | |
1542 | while Present (Assoc) loop | |
1543 | Choice := First (Choices (Assoc)); | |
1544 | while Present (Choice) loop | |
1545 | if Nkind (Choice) = N_Others_Choice then | |
1546 | Others_Present := True; | |
1547 | ||
1548 | if Choice /= First (Choices (Assoc)) | |
1549 | or else Present (Next (Choice)) | |
1550 | then | |
ed2233dc | 1551 | Error_Msg_N |
996ae0b0 RK |
1552 | ("OTHERS must appear alone in a choice list", Choice); |
1553 | return Failure; | |
1554 | end if; | |
1555 | ||
1556 | if Present (Next (Assoc)) then | |
ed2233dc | 1557 | Error_Msg_N |
996ae0b0 RK |
1558 | ("OTHERS must appear last in an aggregate", Choice); |
1559 | return Failure; | |
1560 | end if; | |
1561 | ||
0ab80019 | 1562 | if Ada_Version = Ada_83 |
996ae0b0 | 1563 | and then Assoc /= First (Component_Associations (N)) |
f53f9dd7 RD |
1564 | and then Nkind_In (Parent (N), N_Assignment_Statement, |
1565 | N_Object_Declaration) | |
996ae0b0 RK |
1566 | then |
1567 | Error_Msg_N | |
1568 | ("(Ada 83) illegal context for OTHERS choice", N); | |
1569 | end if; | |
1570 | end if; | |
1571 | ||
1572 | Nb_Choices := Nb_Choices + 1; | |
1573 | Next (Choice); | |
1574 | end loop; | |
1575 | ||
1576 | Next (Assoc); | |
1577 | end loop; | |
1578 | end if; | |
1579 | ||
1580 | -- At this point we know that the others choice, if present, is by | |
1581 | -- itself and appears last in the aggregate. Check if we have mixed | |
1582 | -- positional and discrete associations (other than the others choice). | |
1583 | ||
1584 | if Present (Expressions (N)) | |
1585 | and then (Nb_Choices > 1 | |
1586 | or else (Nb_Choices = 1 and then not Others_Present)) | |
1587 | then | |
1588 | Error_Msg_N | |
1589 | ("named association cannot follow positional association", | |
1590 | First (Choices (First (Component_Associations (N))))); | |
1591 | return Failure; | |
1592 | end if; | |
1593 | ||
1594 | -- Test for the validity of an others choice if present | |
1595 | ||
1596 | if Others_Present and then not Others_Allowed then | |
1597 | Error_Msg_N | |
1598 | ("OTHERS choice not allowed here", | |
1599 | First (Choices (First (Component_Associations (N))))); | |
1600 | return Failure; | |
1601 | end if; | |
1602 | ||
07fc65c4 GB |
1603 | -- Protect against cascaded errors |
1604 | ||
1605 | if Etype (Index_Typ) = Any_Type then | |
1606 | return Failure; | |
1607 | end if; | |
1608 | ||
996ae0b0 RK |
1609 | -- STEP 2: Process named components |
1610 | ||
1611 | if No (Expressions (N)) then | |
996ae0b0 RK |
1612 | if Others_Present then |
1613 | Case_Table_Size := Nb_Choices - 1; | |
1614 | else | |
1615 | Case_Table_Size := Nb_Choices; | |
1616 | end if; | |
1617 | ||
1618 | Step_2 : declare | |
1619 | Low : Node_Id; | |
1620 | High : Node_Id; | |
1621 | -- Denote the lowest and highest values in an aggregate choice | |
1622 | ||
1623 | Hi_Val : Uint; | |
1624 | Lo_Val : Uint; | |
1625 | -- High end of one range and Low end of the next. Should be | |
1626 | -- contiguous if there is no hole in the list of values. | |
1627 | ||
1628 | Missing_Values : Boolean; | |
1629 | -- Set True if missing index values | |
1630 | ||
1631 | S_Low : Node_Id := Empty; | |
1632 | S_High : Node_Id := Empty; | |
1633 | -- if a choice in an aggregate is a subtype indication these | |
1634 | -- denote the lowest and highest values of the subtype | |
1635 | ||
1636 | Table : Case_Table_Type (1 .. Case_Table_Size); | |
1637 | -- Used to sort all the different choice values | |
1638 | ||
1639 | Single_Choice : Boolean; | |
1640 | -- Set to true every time there is a single discrete choice in a | |
1641 | -- discrete association | |
1642 | ||
1643 | Prev_Nb_Discrete_Choices : Nat; | |
b87971f3 AC |
1644 | -- Used to keep track of the number of discrete choices in the |
1645 | -- current association. | |
996ae0b0 RK |
1646 | |
1647 | begin | |
ec53a6da | 1648 | -- STEP 2 (A): Check discrete choices validity |
996ae0b0 RK |
1649 | |
1650 | Assoc := First (Component_Associations (N)); | |
1651 | while Present (Assoc) loop | |
996ae0b0 RK |
1652 | Prev_Nb_Discrete_Choices := Nb_Discrete_Choices; |
1653 | Choice := First (Choices (Assoc)); | |
1654 | loop | |
1655 | Analyze (Choice); | |
1656 | ||
1657 | if Nkind (Choice) = N_Others_Choice then | |
1658 | Single_Choice := False; | |
1659 | exit; | |
1660 | ||
1661 | -- Test for subtype mark without constraint | |
1662 | ||
1663 | elsif Is_Entity_Name (Choice) and then | |
1664 | Is_Type (Entity (Choice)) | |
1665 | then | |
1666 | if Base_Type (Entity (Choice)) /= Index_Base then | |
1667 | Error_Msg_N | |
1668 | ("invalid subtype mark in aggregate choice", | |
1669 | Choice); | |
1670 | return Failure; | |
1671 | end if; | |
1672 | ||
ca44152f ES |
1673 | -- Case of subtype indication |
1674 | ||
996ae0b0 RK |
1675 | elsif Nkind (Choice) = N_Subtype_Indication then |
1676 | Resolve_Discrete_Subtype_Indication (Choice, Index_Base); | |
1677 | ||
1678 | -- Does the subtype indication evaluation raise CE ? | |
1679 | ||
1680 | Get_Index_Bounds (Subtype_Mark (Choice), S_Low, S_High); | |
1681 | Get_Index_Bounds (Choice, Low, High); | |
1682 | Check_Bounds (S_Low, S_High, Low, High); | |
1683 | ||
ca44152f ES |
1684 | -- Case of range or expression |
1685 | ||
1686 | else | |
996ae0b0 | 1687 | Resolve (Choice, Index_Base); |
fbf5a39b | 1688 | Check_Unset_Reference (Choice); |
996ae0b0 RK |
1689 | Check_Non_Static_Context (Choice); |
1690 | ||
1691 | -- Do not range check a choice. This check is redundant | |
b87971f3 AC |
1692 | -- since this test is already done when we check that the |
1693 | -- bounds of the array aggregate are within range. | |
996ae0b0 RK |
1694 | |
1695 | Set_Do_Range_Check (Choice, False); | |
1696 | end if; | |
1697 | ||
1698 | -- If we could not resolve the discrete choice stop here | |
1699 | ||
1700 | if Etype (Choice) = Any_Type then | |
1701 | return Failure; | |
1702 | ||
ec53a6da | 1703 | -- If the discrete choice raises CE get its original bounds |
996ae0b0 RK |
1704 | |
1705 | elsif Nkind (Choice) = N_Raise_Constraint_Error then | |
1706 | Set_Raises_Constraint_Error (N); | |
1707 | Get_Index_Bounds (Original_Node (Choice), Low, High); | |
1708 | ||
1709 | -- Otherwise get its bounds as usual | |
1710 | ||
1711 | else | |
1712 | Get_Index_Bounds (Choice, Low, High); | |
1713 | end if; | |
1714 | ||
1715 | if (Dynamic_Or_Null_Range (Low, High) | |
1716 | or else (Nkind (Choice) = N_Subtype_Indication | |
1717 | and then | |
1718 | Dynamic_Or_Null_Range (S_Low, S_High))) | |
1719 | and then Nb_Choices /= 1 | |
1720 | then | |
1721 | Error_Msg_N | |
1722 | ("dynamic or empty choice in aggregate " & | |
1723 | "must be the only choice", Choice); | |
1724 | return Failure; | |
1725 | end if; | |
1726 | ||
1727 | Nb_Discrete_Choices := Nb_Discrete_Choices + 1; | |
1728 | Table (Nb_Discrete_Choices).Choice_Lo := Low; | |
1729 | Table (Nb_Discrete_Choices).Choice_Hi := High; | |
1730 | ||
1731 | Next (Choice); | |
1732 | ||
1733 | if No (Choice) then | |
9b96e234 | 1734 | |
996ae0b0 RK |
1735 | -- Check if we have a single discrete choice and whether |
1736 | -- this discrete choice specifies a single value. | |
1737 | ||
1738 | Single_Choice := | |
1739 | (Nb_Discrete_Choices = Prev_Nb_Discrete_Choices + 1) | |
1740 | and then (Low = High); | |
1741 | ||
1742 | exit; | |
1743 | end if; | |
1744 | end loop; | |
1745 | ||
0ab80019 | 1746 | -- Ada 2005 (AI-231) |
2820d220 | 1747 | |
ec53a6da | 1748 | if Ada_Version >= Ada_05 |
8133b9d1 | 1749 | and then Known_Null (Expression (Assoc)) |
ec53a6da | 1750 | then |
82c80734 RD |
1751 | Check_Can_Never_Be_Null (Etype (N), Expression (Assoc)); |
1752 | end if; | |
2820d220 | 1753 | |
0ab80019 | 1754 | -- Ada 2005 (AI-287): In case of default initialized component |
b87971f3 | 1755 | -- we delay the resolution to the expansion phase. |
c45b6ae0 AC |
1756 | |
1757 | if Box_Present (Assoc) then | |
1758 | ||
b87971f3 AC |
1759 | -- Ada 2005 (AI-287): In case of default initialization of a |
1760 | -- component the expander will generate calls to the | |
1761 | -- corresponding initialization subprogram. | |
c45b6ae0 | 1762 | |
615cbd95 | 1763 | null; |
c45b6ae0 AC |
1764 | |
1765 | elsif not Resolve_Aggr_Expr (Expression (Assoc), | |
1766 | Single_Elmt => Single_Choice) | |
996ae0b0 RK |
1767 | then |
1768 | return Failure; | |
4755cce9 JM |
1769 | |
1770 | -- Check incorrect use of dynamically tagged expression | |
1771 | ||
1772 | -- We differentiate here two cases because the expression may | |
1773 | -- not be decorated. For example, the analysis and resolution | |
b87971f3 AC |
1774 | -- of the expression associated with the others choice will be |
1775 | -- done later with the full aggregate. In such case we | |
4755cce9 JM |
1776 | -- duplicate the expression tree to analyze the copy and |
1777 | -- perform the required check. | |
1778 | ||
1779 | elsif not Present (Etype (Expression (Assoc))) then | |
1780 | declare | |
1781 | Save_Analysis : constant Boolean := Full_Analysis; | |
1782 | Expr : constant Node_Id := | |
1783 | New_Copy_Tree (Expression (Assoc)); | |
1784 | ||
1785 | begin | |
1786 | Expander_Mode_Save_And_Set (False); | |
1787 | Full_Analysis := False; | |
1788 | Analyze (Expr); | |
1789 | Full_Analysis := Save_Analysis; | |
1790 | Expander_Mode_Restore; | |
1791 | ||
1792 | if Is_Tagged_Type (Etype (Expr)) then | |
1793 | Check_Dynamically_Tagged_Expression | |
1794 | (Expr => Expr, | |
1795 | Typ => Component_Type (Etype (N)), | |
1796 | Related_Nod => N); | |
1797 | end if; | |
1798 | end; | |
1799 | ||
1800 | elsif Is_Tagged_Type (Etype (Expression (Assoc))) then | |
1801 | Check_Dynamically_Tagged_Expression | |
1802 | (Expr => Expression (Assoc), | |
1803 | Typ => Component_Type (Etype (N)), | |
1804 | Related_Nod => N); | |
996ae0b0 RK |
1805 | end if; |
1806 | ||
1807 | Next (Assoc); | |
1808 | end loop; | |
1809 | ||
1810 | -- If aggregate contains more than one choice then these must be | |
b87971f3 | 1811 | -- static. Sort them and check that they are contiguous. |
996ae0b0 RK |
1812 | |
1813 | if Nb_Discrete_Choices > 1 then | |
1814 | Sort_Case_Table (Table); | |
1815 | Missing_Values := False; | |
1816 | ||
1817 | Outer : for J in 1 .. Nb_Discrete_Choices - 1 loop | |
1818 | if Expr_Value (Table (J).Choice_Hi) >= | |
1819 | Expr_Value (Table (J + 1).Choice_Lo) | |
1820 | then | |
1821 | Error_Msg_N | |
1822 | ("duplicate choice values in array aggregate", | |
1823 | Table (J).Choice_Hi); | |
1824 | return Failure; | |
1825 | ||
1826 | elsif not Others_Present then | |
996ae0b0 RK |
1827 | Hi_Val := Expr_Value (Table (J).Choice_Hi); |
1828 | Lo_Val := Expr_Value (Table (J + 1).Choice_Lo); | |
1829 | ||
1830 | -- If missing values, output error messages | |
1831 | ||
1832 | if Lo_Val - Hi_Val > 1 then | |
1833 | ||
1834 | -- Header message if not first missing value | |
1835 | ||
1836 | if not Missing_Values then | |
1837 | Error_Msg_N | |
1838 | ("missing index value(s) in array aggregate", N); | |
1839 | Missing_Values := True; | |
1840 | end if; | |
1841 | ||
1842 | -- Output values of missing indexes | |
1843 | ||
1844 | Lo_Val := Lo_Val - 1; | |
1845 | Hi_Val := Hi_Val + 1; | |
1846 | ||
1847 | -- Enumeration type case | |
1848 | ||
1849 | if Is_Enumeration_Type (Index_Typ) then | |
1850 | Error_Msg_Name_1 := | |
1851 | Chars | |
1852 | (Get_Enum_Lit_From_Pos | |
1853 | (Index_Typ, Hi_Val, Loc)); | |
1854 | ||
1855 | if Lo_Val = Hi_Val then | |
1856 | Error_Msg_N ("\ %", N); | |
1857 | else | |
1858 | Error_Msg_Name_2 := | |
1859 | Chars | |
1860 | (Get_Enum_Lit_From_Pos | |
1861 | (Index_Typ, Lo_Val, Loc)); | |
1862 | Error_Msg_N ("\ % .. %", N); | |
1863 | end if; | |
1864 | ||
1865 | -- Integer types case | |
1866 | ||
1867 | else | |
1868 | Error_Msg_Uint_1 := Hi_Val; | |
1869 | ||
1870 | if Lo_Val = Hi_Val then | |
1871 | Error_Msg_N ("\ ^", N); | |
1872 | else | |
1873 | Error_Msg_Uint_2 := Lo_Val; | |
1874 | Error_Msg_N ("\ ^ .. ^", N); | |
1875 | end if; | |
1876 | end if; | |
1877 | end if; | |
1878 | end if; | |
1879 | end loop Outer; | |
1880 | ||
1881 | if Missing_Values then | |
1882 | Set_Etype (N, Any_Composite); | |
1883 | return Failure; | |
1884 | end if; | |
1885 | end if; | |
1886 | ||
1887 | -- STEP 2 (B): Compute aggregate bounds and min/max choices values | |
1888 | ||
1889 | if Nb_Discrete_Choices > 0 then | |
1890 | Choices_Low := Table (1).Choice_Lo; | |
1891 | Choices_High := Table (Nb_Discrete_Choices).Choice_Hi; | |
1892 | end if; | |
1893 | ||
ca44152f ES |
1894 | -- If Others is present, then bounds of aggregate come from the |
1895 | -- index constraint (not the choices in the aggregate itself). | |
1896 | ||
996ae0b0 RK |
1897 | if Others_Present then |
1898 | Get_Index_Bounds (Index_Constr, Aggr_Low, Aggr_High); | |
1899 | ||
ca44152f ES |
1900 | -- No others clause present |
1901 | ||
996ae0b0 | 1902 | else |
ca44152f ES |
1903 | -- Special processing if others allowed and not present. This |
1904 | -- means that the bounds of the aggregate come from the index | |
1905 | -- constraint (and the length must match). | |
1906 | ||
1907 | if Others_Allowed then | |
1908 | Get_Index_Bounds (Index_Constr, Aggr_Low, Aggr_High); | |
1909 | ||
1910 | -- If others allowed, and no others present, then the array | |
1911 | -- should cover all index values. If it does not, we will | |
1912 | -- get a length check warning, but there is two cases where | |
1913 | -- an additional warning is useful: | |
1914 | ||
1915 | -- If we have no positional components, and the length is | |
1916 | -- wrong (which we can tell by others being allowed with | |
1917 | -- missing components), and the index type is an enumeration | |
1918 | -- type, then issue appropriate warnings about these missing | |
1919 | -- components. They are only warnings, since the aggregate | |
1920 | -- is fine, it's just the wrong length. We skip this check | |
1921 | -- for standard character types (since there are no literals | |
1922 | -- and it is too much trouble to concoct them), and also if | |
1923 | -- any of the bounds have not-known-at-compile-time values. | |
1924 | ||
1925 | -- Another case warranting a warning is when the length is | |
1926 | -- right, but as above we have an index type that is an | |
1927 | -- enumeration, and the bounds do not match. This is a | |
1928 | -- case where dubious sliding is allowed and we generate | |
1929 | -- a warning that the bounds do not match. | |
1930 | ||
1931 | if No (Expressions (N)) | |
1932 | and then Nkind (Index) = N_Range | |
1933 | and then Is_Enumeration_Type (Etype (Index)) | |
1934 | and then not Is_Standard_Character_Type (Etype (Index)) | |
1935 | and then Compile_Time_Known_Value (Aggr_Low) | |
1936 | and then Compile_Time_Known_Value (Aggr_High) | |
1937 | and then Compile_Time_Known_Value (Choices_Low) | |
1938 | and then Compile_Time_Known_Value (Choices_High) | |
1939 | then | |
d610088d | 1940 | -- If the bounds have semantic errors, do not attempt |
ebd34478 | 1941 | -- further resolution to prevent cascaded errors. |
d610088d AC |
1942 | |
1943 | if Error_Posted (Choices_Low) | |
1944 | or else Error_Posted (Choices_High) | |
1945 | then | |
1946 | return False; | |
1947 | end if; | |
1948 | ||
ca44152f ES |
1949 | declare |
1950 | ALo : constant Node_Id := Expr_Value_E (Aggr_Low); | |
1951 | AHi : constant Node_Id := Expr_Value_E (Aggr_High); | |
1952 | CLo : constant Node_Id := Expr_Value_E (Choices_Low); | |
1953 | CHi : constant Node_Id := Expr_Value_E (Choices_High); | |
1954 | ||
1955 | Ent : Entity_Id; | |
1956 | ||
1957 | begin | |
ebd34478 | 1958 | -- Warning case 1, missing values at start/end. Only |
ca44152f ES |
1959 | -- do the check if the number of entries is too small. |
1960 | ||
1961 | if (Enumeration_Pos (CHi) - Enumeration_Pos (CLo)) | |
1962 | < | |
1963 | (Enumeration_Pos (AHi) - Enumeration_Pos (ALo)) | |
1964 | then | |
1965 | Error_Msg_N | |
1966 | ("missing index value(s) in array aggregate?", N); | |
1967 | ||
1968 | -- Output missing value(s) at start | |
1969 | ||
1970 | if Chars (ALo) /= Chars (CLo) then | |
1971 | Ent := Prev (CLo); | |
1972 | ||
1973 | if Chars (ALo) = Chars (Ent) then | |
1974 | Error_Msg_Name_1 := Chars (ALo); | |
1975 | Error_Msg_N ("\ %?", N); | |
1976 | else | |
1977 | Error_Msg_Name_1 := Chars (ALo); | |
1978 | Error_Msg_Name_2 := Chars (Ent); | |
1979 | Error_Msg_N ("\ % .. %?", N); | |
1980 | end if; | |
1981 | end if; | |
1982 | ||
1983 | -- Output missing value(s) at end | |
1984 | ||
1985 | if Chars (AHi) /= Chars (CHi) then | |
1986 | Ent := Next (CHi); | |
1987 | ||
1988 | if Chars (AHi) = Chars (Ent) then | |
1989 | Error_Msg_Name_1 := Chars (Ent); | |
1990 | Error_Msg_N ("\ %?", N); | |
1991 | else | |
1992 | Error_Msg_Name_1 := Chars (Ent); | |
1993 | Error_Msg_Name_2 := Chars (AHi); | |
1994 | Error_Msg_N ("\ % .. %?", N); | |
1995 | end if; | |
1996 | end if; | |
1997 | ||
1998 | -- Warning case 2, dubious sliding. The First_Subtype | |
1999 | -- test distinguishes between a constrained type where | |
2000 | -- sliding is not allowed (so we will get a warning | |
2001 | -- later that Constraint_Error will be raised), and | |
2002 | -- the unconstrained case where sliding is permitted. | |
2003 | ||
2004 | elsif (Enumeration_Pos (CHi) - Enumeration_Pos (CLo)) | |
2005 | = | |
2006 | (Enumeration_Pos (AHi) - Enumeration_Pos (ALo)) | |
2007 | and then Chars (ALo) /= Chars (CLo) | |
2008 | and then | |
2009 | not Is_Constrained (First_Subtype (Etype (N))) | |
2010 | then | |
2011 | Error_Msg_N | |
2012 | ("bounds of aggregate do not match target?", N); | |
2013 | end if; | |
2014 | end; | |
2015 | end if; | |
2016 | end if; | |
2017 | ||
f3d0f304 | 2018 | -- If no others, aggregate bounds come from aggregate |
ca44152f | 2019 | |
996ae0b0 RK |
2020 | Aggr_Low := Choices_Low; |
2021 | Aggr_High := Choices_High; | |
2022 | end if; | |
2023 | end Step_2; | |
2024 | ||
2025 | -- STEP 3: Process positional components | |
2026 | ||
2027 | else | |
2028 | -- STEP 3 (A): Process positional elements | |
2029 | ||
2030 | Expr := First (Expressions (N)); | |
2031 | Nb_Elements := Uint_0; | |
2032 | while Present (Expr) loop | |
2033 | Nb_Elements := Nb_Elements + 1; | |
2034 | ||
82c80734 RD |
2035 | -- Ada 2005 (AI-231) |
2036 | ||
ec53a6da | 2037 | if Ada_Version >= Ada_05 |
8133b9d1 | 2038 | and then Known_Null (Expr) |
ec53a6da | 2039 | then |
82c80734 RD |
2040 | Check_Can_Never_Be_Null (Etype (N), Expr); |
2041 | end if; | |
2820d220 | 2042 | |
996ae0b0 RK |
2043 | if not Resolve_Aggr_Expr (Expr, Single_Elmt => True) then |
2044 | return Failure; | |
2045 | end if; | |
2046 | ||
4755cce9 JM |
2047 | -- Check incorrect use of dynamically tagged expression |
2048 | ||
2049 | if Is_Tagged_Type (Etype (Expr)) then | |
2050 | Check_Dynamically_Tagged_Expression | |
2051 | (Expr => Expr, | |
2052 | Typ => Component_Type (Etype (N)), | |
2053 | Related_Nod => N); | |
2054 | end if; | |
2055 | ||
996ae0b0 RK |
2056 | Next (Expr); |
2057 | end loop; | |
2058 | ||
2059 | if Others_Present then | |
2060 | Assoc := Last (Component_Associations (N)); | |
c45b6ae0 | 2061 | |
82c80734 RD |
2062 | -- Ada 2005 (AI-231) |
2063 | ||
ec53a6da | 2064 | if Ada_Version >= Ada_05 |
8133b9d1 | 2065 | and then Known_Null (Assoc) |
ec53a6da | 2066 | then |
9b96e234 | 2067 | Check_Can_Never_Be_Null (Etype (N), Expression (Assoc)); |
82c80734 | 2068 | end if; |
2820d220 | 2069 | |
ebd34478 | 2070 | -- Ada 2005 (AI-287): In case of default initialized component, |
c45b6ae0 AC |
2071 | -- we delay the resolution to the expansion phase. |
2072 | ||
2073 | if Box_Present (Assoc) then | |
2074 | ||
ebd34478 AC |
2075 | -- Ada 2005 (AI-287): In case of default initialization of a |
2076 | -- component the expander will generate calls to the | |
2077 | -- corresponding initialization subprogram. | |
c45b6ae0 | 2078 | |
615cbd95 | 2079 | null; |
c45b6ae0 AC |
2080 | |
2081 | elsif not Resolve_Aggr_Expr (Expression (Assoc), | |
2082 | Single_Elmt => False) | |
996ae0b0 RK |
2083 | then |
2084 | return Failure; | |
4755cce9 JM |
2085 | |
2086 | -- Check incorrect use of dynamically tagged expression. The | |
2087 | -- expression of the others choice has not been resolved yet. | |
2088 | -- In order to diagnose the semantic error we create a duplicate | |
2089 | -- tree to analyze it and perform the check. | |
2090 | ||
2091 | else | |
2092 | declare | |
2093 | Save_Analysis : constant Boolean := Full_Analysis; | |
2094 | Expr : constant Node_Id := | |
2095 | New_Copy_Tree (Expression (Assoc)); | |
2096 | ||
2097 | begin | |
2098 | Expander_Mode_Save_And_Set (False); | |
2099 | Full_Analysis := False; | |
2100 | Analyze (Expr); | |
2101 | Full_Analysis := Save_Analysis; | |
2102 | Expander_Mode_Restore; | |
2103 | ||
2104 | if Is_Tagged_Type (Etype (Expr)) then | |
2105 | Check_Dynamically_Tagged_Expression | |
2106 | (Expr => Expr, | |
2107 | Typ => Component_Type (Etype (N)), | |
2108 | Related_Nod => N); | |
2109 | end if; | |
2110 | end; | |
996ae0b0 RK |
2111 | end if; |
2112 | end if; | |
2113 | ||
2114 | -- STEP 3 (B): Compute the aggregate bounds | |
2115 | ||
2116 | if Others_Present then | |
2117 | Get_Index_Bounds (Index_Constr, Aggr_Low, Aggr_High); | |
2118 | ||
2119 | else | |
2120 | if Others_Allowed then | |
f91e8020 | 2121 | Get_Index_Bounds (Index_Constr, Aggr_Low, Discard); |
996ae0b0 RK |
2122 | else |
2123 | Aggr_Low := Index_Typ_Low; | |
2124 | end if; | |
2125 | ||
2126 | Aggr_High := Add (Nb_Elements - 1, To => Aggr_Low); | |
2127 | Check_Bound (Index_Base_High, Aggr_High); | |
2128 | end if; | |
2129 | end if; | |
2130 | ||
2131 | -- STEP 4: Perform static aggregate checks and save the bounds | |
2132 | ||
2133 | -- Check (A) | |
2134 | ||
2135 | Check_Bounds (Index_Typ_Low, Index_Typ_High, Aggr_Low, Aggr_High); | |
2136 | Check_Bounds (Index_Base_Low, Index_Base_High, Aggr_Low, Aggr_High); | |
2137 | ||
2138 | -- Check (B) | |
2139 | ||
2140 | if Others_Present and then Nb_Discrete_Choices > 0 then | |
2141 | Check_Bounds (Aggr_Low, Aggr_High, Choices_Low, Choices_High); | |
2142 | Check_Bounds (Index_Typ_Low, Index_Typ_High, | |
2143 | Choices_Low, Choices_High); | |
2144 | Check_Bounds (Index_Base_Low, Index_Base_High, | |
2145 | Choices_Low, Choices_High); | |
2146 | ||
2147 | -- Check (C) | |
2148 | ||
2149 | elsif Others_Present and then Nb_Elements > 0 then | |
2150 | Check_Length (Aggr_Low, Aggr_High, Nb_Elements); | |
2151 | Check_Length (Index_Typ_Low, Index_Typ_High, Nb_Elements); | |
2152 | Check_Length (Index_Base_Low, Index_Base_High, Nb_Elements); | |
996ae0b0 RK |
2153 | end if; |
2154 | ||
2155 | if Raises_Constraint_Error (Aggr_Low) | |
2156 | or else Raises_Constraint_Error (Aggr_High) | |
2157 | then | |
2158 | Set_Raises_Constraint_Error (N); | |
2159 | end if; | |
2160 | ||
2161 | Aggr_Low := Duplicate_Subexpr (Aggr_Low); | |
2162 | ||
2163 | -- Do not duplicate Aggr_High if Aggr_High = Aggr_Low + Nb_Elements | |
2164 | -- since the addition node returned by Add is not yet analyzed. Attach | |
ebd34478 | 2165 | -- to tree and analyze first. Reset analyzed flag to ensure it will get |
9b96e234 | 2166 | -- analyzed when it is a literal bound whose type must be properly set. |
996ae0b0 RK |
2167 | |
2168 | if Others_Present or else Nb_Discrete_Choices > 0 then | |
2169 | Aggr_High := Duplicate_Subexpr (Aggr_High); | |
2170 | ||
2171 | if Etype (Aggr_High) = Universal_Integer then | |
2172 | Set_Analyzed (Aggr_High, False); | |
2173 | end if; | |
2174 | end if; | |
2175 | ||
3d923671 AC |
2176 | -- If the aggregate already has bounds attached to it, it means this is |
2177 | -- a positional aggregate created as an optimization by | |
2178 | -- Exp_Aggr.Convert_To_Positional, so we don't want to change those | |
2179 | -- bounds. | |
2180 | ||
2181 | if Present (Aggregate_Bounds (N)) and then not Others_Allowed then | |
ebd34478 | 2182 | Aggr_Low := Low_Bound (Aggregate_Bounds (N)); |
3d923671 AC |
2183 | Aggr_High := High_Bound (Aggregate_Bounds (N)); |
2184 | end if; | |
2185 | ||
996ae0b0 RK |
2186 | Set_Aggregate_Bounds |
2187 | (N, Make_Range (Loc, Low_Bound => Aggr_Low, High_Bound => Aggr_High)); | |
2188 | ||
2189 | -- The bounds may contain expressions that must be inserted upwards. | |
2190 | -- Attach them fully to the tree. After analysis, remove side effects | |
2191 | -- from upper bound, if still needed. | |
2192 | ||
2193 | Set_Parent (Aggregate_Bounds (N), N); | |
2194 | Analyze_And_Resolve (Aggregate_Bounds (N), Index_Typ); | |
fbf5a39b | 2195 | Check_Unset_Reference (Aggregate_Bounds (N)); |
996ae0b0 RK |
2196 | |
2197 | if not Others_Present and then Nb_Discrete_Choices = 0 then | |
2198 | Set_High_Bound (Aggregate_Bounds (N), | |
2199 | Duplicate_Subexpr (High_Bound (Aggregate_Bounds (N)))); | |
2200 | end if; | |
2201 | ||
2202 | return Success; | |
2203 | end Resolve_Array_Aggregate; | |
2204 | ||
2205 | --------------------------------- | |
2206 | -- Resolve_Extension_Aggregate -- | |
2207 | --------------------------------- | |
2208 | ||
2209 | -- There are two cases to consider: | |
2210 | ||
ebd34478 AC |
2211 | -- a) If the ancestor part is a type mark, the components needed are the |
2212 | -- difference between the components of the expected type and the | |
996ae0b0 RK |
2213 | -- components of the given type mark. |
2214 | ||
ebd34478 AC |
2215 | -- b) If the ancestor part is an expression, it must be unambiguous, and |
2216 | -- once we have its type we can also compute the needed components as in | |
2217 | -- the previous case. In both cases, if the ancestor type is not the | |
2218 | -- immediate ancestor, we have to build this ancestor recursively. | |
996ae0b0 | 2219 | |
ebd34478 AC |
2220 | -- In both cases discriminants of the ancestor type do not play a role in |
2221 | -- the resolution of the needed components, because inherited discriminants | |
2222 | -- cannot be used in a type extension. As a result we can compute | |
2223 | -- independently the list of components of the ancestor type and of the | |
2224 | -- expected type. | |
996ae0b0 RK |
2225 | |
2226 | procedure Resolve_Extension_Aggregate (N : Node_Id; Typ : Entity_Id) is | |
fbf5a39b AC |
2227 | A : constant Node_Id := Ancestor_Part (N); |
2228 | A_Type : Entity_Id; | |
2229 | I : Interp_Index; | |
2230 | It : Interp; | |
996ae0b0 | 2231 | |
ca44152f ES |
2232 | function Valid_Limited_Ancestor (Anc : Node_Id) return Boolean; |
2233 | -- If the type is limited, verify that the ancestor part is a legal | |
ebd34478 AC |
2234 | -- expression (aggregate or function call, including 'Input)) that does |
2235 | -- not require a copy, as specified in 7.5(2). | |
ca44152f | 2236 | |
996ae0b0 RK |
2237 | function Valid_Ancestor_Type return Boolean; |
2238 | -- Verify that the type of the ancestor part is a non-private ancestor | |
1543e3ab | 2239 | -- of the expected type, which must be a type extension. |
996ae0b0 | 2240 | |
ca44152f ES |
2241 | ---------------------------- |
2242 | -- Valid_Limited_Ancestor -- | |
2243 | ---------------------------- | |
2244 | ||
2245 | function Valid_Limited_Ancestor (Anc : Node_Id) return Boolean is | |
2246 | begin | |
2247 | if Is_Entity_Name (Anc) | |
2248 | and then Is_Type (Entity (Anc)) | |
2249 | then | |
2250 | return True; | |
2251 | ||
2252 | elsif Nkind_In (Anc, N_Aggregate, N_Function_Call) then | |
2253 | return True; | |
2254 | ||
2255 | elsif Nkind (Anc) = N_Attribute_Reference | |
2256 | and then Attribute_Name (Anc) = Name_Input | |
2257 | then | |
2258 | return True; | |
2259 | ||
ebd34478 | 2260 | elsif Nkind (Anc) = N_Qualified_Expression then |
ca44152f ES |
2261 | return Valid_Limited_Ancestor (Expression (Anc)); |
2262 | ||
2263 | else | |
2264 | return False; | |
2265 | end if; | |
2266 | end Valid_Limited_Ancestor; | |
2267 | ||
fbf5a39b AC |
2268 | ------------------------- |
2269 | -- Valid_Ancestor_Type -- | |
2270 | ------------------------- | |
2271 | ||
996ae0b0 RK |
2272 | function Valid_Ancestor_Type return Boolean is |
2273 | Imm_Type : Entity_Id; | |
2274 | ||
2275 | begin | |
2276 | Imm_Type := Base_Type (Typ); | |
2af92e28 ES |
2277 | while Is_Derived_Type (Imm_Type) loop |
2278 | if Etype (Imm_Type) = Base_Type (A_Type) then | |
2279 | return True; | |
2280 | ||
2281 | -- The base type of the parent type may appear as a private | |
ebd34478 AC |
2282 | -- extension if it is declared as such in a parent unit of the |
2283 | -- current one. For consistency of the subsequent analysis use | |
2284 | -- the partial view for the ancestor part. | |
2af92e28 ES |
2285 | |
2286 | elsif Is_Private_Type (Etype (Imm_Type)) | |
2287 | and then Present (Full_View (Etype (Imm_Type))) | |
2288 | and then Base_Type (A_Type) = Full_View (Etype (Imm_Type)) | |
2289 | then | |
2290 | A_Type := Etype (Imm_Type); | |
2291 | return True; | |
4519314c AC |
2292 | |
2293 | -- The parent type may be a private extension. The aggregate is | |
2294 | -- legal if the type of the aggregate is an extension of it that | |
2295 | -- is not a private extension. | |
2296 | ||
2297 | elsif Is_Private_Type (A_Type) | |
2298 | and then not Is_Private_Type (Imm_Type) | |
2299 | and then Present (Full_View (A_Type)) | |
2300 | and then Base_Type (Full_View (A_Type)) = Etype (Imm_Type) | |
2301 | then | |
2302 | return True; | |
2303 | ||
2af92e28 ES |
2304 | else |
2305 | Imm_Type := Etype (Base_Type (Imm_Type)); | |
2306 | end if; | |
996ae0b0 RK |
2307 | end loop; |
2308 | ||
6d2a1120 | 2309 | -- If previous loop did not find a proper ancestor, report error |
2af92e28 ES |
2310 | |
2311 | Error_Msg_NE ("expect ancestor type of &", A, Typ); | |
2312 | return False; | |
996ae0b0 RK |
2313 | end Valid_Ancestor_Type; |
2314 | ||
2315 | -- Start of processing for Resolve_Extension_Aggregate | |
2316 | ||
2317 | begin | |
ebd34478 AC |
2318 | -- Analyze the ancestor part and account for the case where it is a |
2319 | -- parameterless function call. | |
70b70ce8 | 2320 | |
996ae0b0 | 2321 | Analyze (A); |
70b70ce8 | 2322 | Check_Parameterless_Call (A); |
996ae0b0 RK |
2323 | |
2324 | if not Is_Tagged_Type (Typ) then | |
2325 | Error_Msg_N ("type of extension aggregate must be tagged", N); | |
2326 | return; | |
2327 | ||
19f0526a AC |
2328 | elsif Is_Limited_Type (Typ) then |
2329 | ||
0ab80019 | 2330 | -- Ada 2005 (AI-287): Limited aggregates are allowed |
19f0526a | 2331 | |
0ab80019 | 2332 | if Ada_Version < Ada_05 then |
19f0526a AC |
2333 | Error_Msg_N ("aggregate type cannot be limited", N); |
2334 | Explain_Limited_Type (Typ, N); | |
2335 | return; | |
ca44152f ES |
2336 | |
2337 | elsif Valid_Limited_Ancestor (A) then | |
2338 | null; | |
2339 | ||
2340 | else | |
2341 | Error_Msg_N | |
2342 | ("limited ancestor part must be aggregate or function call", A); | |
19f0526a | 2343 | end if; |
996ae0b0 RK |
2344 | |
2345 | elsif Is_Class_Wide_Type (Typ) then | |
2346 | Error_Msg_N ("aggregate cannot be of a class-wide type", N); | |
2347 | return; | |
2348 | end if; | |
2349 | ||
2350 | if Is_Entity_Name (A) | |
2351 | and then Is_Type (Entity (A)) | |
2352 | then | |
fbf5a39b | 2353 | A_Type := Get_Full_View (Entity (A)); |
996ae0b0 RK |
2354 | |
2355 | if Valid_Ancestor_Type then | |
2356 | Set_Entity (A, A_Type); | |
2357 | Set_Etype (A, A_Type); | |
2358 | ||
2359 | Validate_Ancestor_Part (N); | |
2360 | Resolve_Record_Aggregate (N, Typ); | |
2361 | end if; | |
2362 | ||
2363 | elsif Nkind (A) /= N_Aggregate then | |
2364 | if Is_Overloaded (A) then | |
2365 | A_Type := Any_Type; | |
996ae0b0 | 2366 | |
7f9747c6 | 2367 | Get_First_Interp (A, I, It); |
996ae0b0 | 2368 | while Present (It.Typ) loop |
70b70ce8 AC |
2369 | -- Only consider limited interpretations in the Ada 2005 case |
2370 | ||
996ae0b0 | 2371 | if Is_Tagged_Type (It.Typ) |
70b70ce8 AC |
2372 | and then (Ada_Version >= Ada_05 |
2373 | or else not Is_Limited_Type (It.Typ)) | |
996ae0b0 RK |
2374 | then |
2375 | if A_Type /= Any_Type then | |
2376 | Error_Msg_N ("cannot resolve expression", A); | |
2377 | return; | |
2378 | else | |
2379 | A_Type := It.Typ; | |
2380 | end if; | |
2381 | end if; | |
2382 | ||
2383 | Get_Next_Interp (I, It); | |
2384 | end loop; | |
2385 | ||
2386 | if A_Type = Any_Type then | |
70b70ce8 AC |
2387 | if Ada_Version >= Ada_05 then |
2388 | Error_Msg_N ("ancestor part must be of a tagged type", A); | |
2389 | else | |
2390 | Error_Msg_N | |
2391 | ("ancestor part must be of a nonlimited tagged type", A); | |
2392 | end if; | |
2393 | ||
996ae0b0 RK |
2394 | return; |
2395 | end if; | |
2396 | ||
2397 | else | |
2398 | A_Type := Etype (A); | |
2399 | end if; | |
2400 | ||
2401 | if Valid_Ancestor_Type then | |
2402 | Resolve (A, A_Type); | |
fbf5a39b | 2403 | Check_Unset_Reference (A); |
996ae0b0 | 2404 | Check_Non_Static_Context (A); |
fbf5a39b | 2405 | |
1646c947 GD |
2406 | -- The aggregate is illegal if the ancestor expression is a call |
2407 | -- to a function with a limited unconstrained result, unless the | |
2408 | -- type of the aggregate is a null extension. This restriction | |
2409 | -- was added in AI05-67 to simplify implementation. | |
2410 | ||
2411 | if Nkind (A) = N_Function_Call | |
2412 | and then Is_Limited_Type (A_Type) | |
2413 | and then not Is_Null_Extension (Typ) | |
2414 | and then not Is_Constrained (A_Type) | |
2415 | then | |
2416 | Error_Msg_N | |
2417 | ("type of limited ancestor part must be constrained", A); | |
2418 | ||
2419 | elsif Is_Class_Wide_Type (Etype (A)) | |
fbf5a39b AC |
2420 | and then Nkind (Original_Node (A)) = N_Function_Call |
2421 | then | |
2422 | -- If the ancestor part is a dispatching call, it appears | |
ebd34478 AC |
2423 | -- statically to be a legal ancestor, but it yields any member |
2424 | -- of the class, and it is not possible to determine whether | |
2425 | -- it is an ancestor of the extension aggregate (much less | |
2426 | -- which ancestor). It is not possible to determine the | |
2427 | -- components of the extension part. | |
fbf5a39b | 2428 | |
ebd34478 AC |
2429 | -- This check implements AI-306, which in fact was motivated by |
2430 | -- an AdaCore query to the ARG after this test was added. | |
82c80734 | 2431 | |
fbf5a39b AC |
2432 | Error_Msg_N ("ancestor part must be statically tagged", A); |
2433 | else | |
2434 | Resolve_Record_Aggregate (N, Typ); | |
2435 | end if; | |
996ae0b0 RK |
2436 | end if; |
2437 | ||
2438 | else | |
88b32fc3 | 2439 | Error_Msg_N ("no unique type for this aggregate", A); |
996ae0b0 | 2440 | end if; |
996ae0b0 RK |
2441 | end Resolve_Extension_Aggregate; |
2442 | ||
2443 | ------------------------------ | |
2444 | -- Resolve_Record_Aggregate -- | |
2445 | ------------------------------ | |
2446 | ||
2447 | procedure Resolve_Record_Aggregate (N : Node_Id; Typ : Entity_Id) is | |
9b96e234 JM |
2448 | Assoc : Node_Id; |
2449 | -- N_Component_Association node belonging to the input aggregate N | |
2450 | ||
2451 | Expr : Node_Id; | |
2452 | Positional_Expr : Node_Id; | |
2453 | Component : Entity_Id; | |
2454 | Component_Elmt : Elmt_Id; | |
2455 | ||
2456 | Components : constant Elist_Id := New_Elmt_List; | |
ebd34478 AC |
2457 | -- Components is the list of the record components whose value must be |
2458 | -- provided in the aggregate. This list does include discriminants. | |
9b96e234 | 2459 | |
fbf5a39b AC |
2460 | New_Assoc_List : constant List_Id := New_List; |
2461 | New_Assoc : Node_Id; | |
996ae0b0 RK |
2462 | -- New_Assoc_List is the newly built list of N_Component_Association |
2463 | -- nodes. New_Assoc is one such N_Component_Association node in it. | |
ebd34478 AC |
2464 | -- Note that while Assoc and New_Assoc contain the same kind of nodes, |
2465 | -- they are used to iterate over two different N_Component_Association | |
2466 | -- lists. | |
996ae0b0 RK |
2467 | |
2468 | Others_Etype : Entity_Id := Empty; | |
2469 | -- This variable is used to save the Etype of the last record component | |
2470 | -- that takes its value from the others choice. Its purpose is: | |
2471 | -- | |
2472 | -- (a) make sure the others choice is useful | |
2473 | -- | |
2474 | -- (b) make sure the type of all the components whose value is | |
2475 | -- subsumed by the others choice are the same. | |
2476 | -- | |
ebd34478 | 2477 | -- This variable is updated as a side effect of function Get_Value. |
996ae0b0 | 2478 | |
9b96e234 JM |
2479 | Is_Box_Present : Boolean := False; |
2480 | Others_Box : Boolean := False; | |
0ab80019 | 2481 | -- Ada 2005 (AI-287): Variables used in case of default initialization |
9b96e234 | 2482 | -- to provide a functionality similar to Others_Etype. Box_Present |
19f0526a | 2483 | -- indicates that the component takes its default initialization; |
9b96e234 | 2484 | -- Others_Box indicates that at least one component takes its default |
19f0526a AC |
2485 | -- initialization. Similar to Others_Etype, they are also updated as a |
2486 | -- side effect of function Get_Value. | |
65356e64 AC |
2487 | |
2488 | procedure Add_Association | |
9b96e234 JM |
2489 | (Component : Entity_Id; |
2490 | Expr : Node_Id; | |
107b023c | 2491 | Assoc_List : List_Id; |
9b96e234 | 2492 | Is_Box_Present : Boolean := False); |
ebd34478 AC |
2493 | -- Builds a new N_Component_Association node which associates Component |
2494 | -- to expression Expr and adds it to the association list being built, | |
2495 | -- either New_Assoc_List, or the association being built for an inner | |
2496 | -- aggregate. | |
996ae0b0 RK |
2497 | |
2498 | function Discr_Present (Discr : Entity_Id) return Boolean; | |
2499 | -- If aggregate N is a regular aggregate this routine will return True. | |
fbf5a39b | 2500 | -- Otherwise, if N is an extension aggregate, Discr is a discriminant |
ebd34478 AC |
2501 | -- whose value may already have been specified by N's ancestor part. |
2502 | -- This routine checks whether this is indeed the case and if so returns | |
2503 | -- False, signaling that no value for Discr should appear in N's | |
f104fca1 | 2504 | -- aggregate part. Also, in this case, the routine appends to |
2383acbd AC |
2505 | -- New_Assoc_List the discriminant value specified in the ancestor part. |
2506 | -- | |
f104fca1 | 2507 | -- If the aggregate is in a context with expansion delayed, it will be |
22cb89b5 AC |
2508 | -- reanalyzed. The inherited discriminant values must not be reinserted |
2509 | -- in the component list to prevent spurious errors, but they must be | |
f104fca1 AC |
2510 | -- present on first analysis to build the proper subtype indications. |
2511 | -- The flag Inherited_Discriminant is used to prevent the re-insertion. | |
996ae0b0 RK |
2512 | |
2513 | function Get_Value | |
2514 | (Compon : Node_Id; | |
2515 | From : List_Id; | |
2516 | Consider_Others_Choice : Boolean := False) | |
2517 | return Node_Id; | |
4519314c AC |
2518 | -- Given a record component stored in parameter Compon, this function |
2519 | -- returns its value as it appears in the list From, which is a list | |
2520 | -- of N_Component_Association nodes. | |
2383acbd | 2521 | -- |
ebd34478 AC |
2522 | -- If no component association has a choice for the searched component, |
2523 | -- the value provided by the others choice is returned, if there is one, | |
2524 | -- and Consider_Others_Choice is set to true. Otherwise Empty is | |
2525 | -- returned. If there is more than one component association giving a | |
2526 | -- value for the searched record component, an error message is emitted | |
2527 | -- and the first found value is returned. | |
996ae0b0 RK |
2528 | -- |
2529 | -- If Consider_Others_Choice is set and the returned expression comes | |
2530 | -- from the others choice, then Others_Etype is set as a side effect. | |
ebd34478 AC |
2531 | -- An error message is emitted if the components taking their value from |
2532 | -- the others choice do not have same type. | |
996ae0b0 RK |
2533 | |
2534 | procedure Resolve_Aggr_Expr (Expr : Node_Id; Component : Node_Id); | |
2535 | -- Analyzes and resolves expression Expr against the Etype of the | |
638e383e | 2536 | -- Component. This routine also applies all appropriate checks to Expr. |
996ae0b0 RK |
2537 | -- It finally saves a Expr in the newly created association list that |
2538 | -- will be attached to the final record aggregate. Note that if the | |
2539 | -- Parent pointer of Expr is not set then Expr was produced with a | |
fbf5a39b | 2540 | -- New_Copy_Tree or some such. |
996ae0b0 RK |
2541 | |
2542 | --------------------- | |
2543 | -- Add_Association -- | |
2544 | --------------------- | |
2545 | ||
65356e64 | 2546 | procedure Add_Association |
9b96e234 JM |
2547 | (Component : Entity_Id; |
2548 | Expr : Node_Id; | |
107b023c | 2549 | Assoc_List : List_Id; |
9b96e234 | 2550 | Is_Box_Present : Boolean := False) |
65356e64 | 2551 | is |
fbf5a39b | 2552 | Choice_List : constant List_Id := New_List; |
996ae0b0 | 2553 | New_Assoc : Node_Id; |
996ae0b0 RK |
2554 | |
2555 | begin | |
2556 | Append (New_Occurrence_Of (Component, Sloc (Expr)), Choice_List); | |
2557 | New_Assoc := | |
2558 | Make_Component_Association (Sloc (Expr), | |
65356e64 AC |
2559 | Choices => Choice_List, |
2560 | Expression => Expr, | |
9b96e234 | 2561 | Box_Present => Is_Box_Present); |
107b023c | 2562 | Append (New_Assoc, Assoc_List); |
996ae0b0 RK |
2563 | end Add_Association; |
2564 | ||
2565 | ------------------- | |
2566 | -- Discr_Present -- | |
2567 | ------------------- | |
2568 | ||
2569 | function Discr_Present (Discr : Entity_Id) return Boolean is | |
fbf5a39b AC |
2570 | Regular_Aggr : constant Boolean := Nkind (N) /= N_Extension_Aggregate; |
2571 | ||
996ae0b0 RK |
2572 | Loc : Source_Ptr; |
2573 | ||
2574 | Ancestor : Node_Id; | |
f104fca1 | 2575 | Comp_Assoc : Node_Id; |
996ae0b0 RK |
2576 | Discr_Expr : Node_Id; |
2577 | ||
2578 | Ancestor_Typ : Entity_Id; | |
2579 | Orig_Discr : Entity_Id; | |
2580 | D : Entity_Id; | |
2581 | D_Val : Elmt_Id := No_Elmt; -- stop junk warning | |
2582 | ||
2583 | Ancestor_Is_Subtyp : Boolean; | |
2584 | ||
2585 | begin | |
2586 | if Regular_Aggr then | |
2587 | return True; | |
2588 | end if; | |
2589 | ||
f104fca1 AC |
2590 | -- Check whether inherited discriminant values have already been |
2591 | -- inserted in the aggregate. This will be the case if we are | |
2592 | -- re-analyzing an aggregate whose expansion was delayed. | |
2593 | ||
2594 | if Present (Component_Associations (N)) then | |
2595 | Comp_Assoc := First (Component_Associations (N)); | |
2596 | while Present (Comp_Assoc) loop | |
2597 | if Inherited_Discriminant (Comp_Assoc) then | |
2598 | return True; | |
2599 | end if; | |
2383acbd | 2600 | |
f104fca1 AC |
2601 | Next (Comp_Assoc); |
2602 | end loop; | |
2603 | end if; | |
2604 | ||
996ae0b0 RK |
2605 | Ancestor := Ancestor_Part (N); |
2606 | Ancestor_Typ := Etype (Ancestor); | |
2607 | Loc := Sloc (Ancestor); | |
2608 | ||
5987e59c AC |
2609 | -- For a private type with unknown discriminants, use the underlying |
2610 | -- record view if it is available. | |
9013065b AC |
2611 | |
2612 | if Has_Unknown_Discriminants (Ancestor_Typ) | |
2613 | and then Present (Full_View (Ancestor_Typ)) | |
2614 | and then Present (Underlying_Record_View (Full_View (Ancestor_Typ))) | |
2615 | then | |
2616 | Ancestor_Typ := Underlying_Record_View (Full_View (Ancestor_Typ)); | |
2617 | end if; | |
2618 | ||
996ae0b0 RK |
2619 | Ancestor_Is_Subtyp := |
2620 | Is_Entity_Name (Ancestor) and then Is_Type (Entity (Ancestor)); | |
2621 | ||
2622 | -- If the ancestor part has no discriminants clearly N's aggregate | |
2623 | -- part must provide a value for Discr. | |
2624 | ||
2625 | if not Has_Discriminants (Ancestor_Typ) then | |
2626 | return True; | |
2627 | ||
2628 | -- If the ancestor part is an unconstrained subtype mark then the | |
2629 | -- Discr must be present in N's aggregate part. | |
2630 | ||
2631 | elsif Ancestor_Is_Subtyp | |
2632 | and then not Is_Constrained (Entity (Ancestor)) | |
2633 | then | |
2634 | return True; | |
2635 | end if; | |
2636 | ||
ec53a6da | 2637 | -- Now look to see if Discr was specified in the ancestor part |
996ae0b0 RK |
2638 | |
2639 | if Ancestor_Is_Subtyp then | |
2640 | D_Val := First_Elmt (Discriminant_Constraint (Entity (Ancestor))); | |
2641 | end if; | |
2642 | ||
ec53a6da JM |
2643 | Orig_Discr := Original_Record_Component (Discr); |
2644 | ||
2645 | D := First_Discriminant (Ancestor_Typ); | |
996ae0b0 | 2646 | while Present (D) loop |
ec53a6da | 2647 | |
ebd34478 | 2648 | -- If Ancestor has already specified Disc value then insert its |
ec53a6da | 2649 | -- value in the final aggregate. |
996ae0b0 RK |
2650 | |
2651 | if Original_Record_Component (D) = Orig_Discr then | |
2652 | if Ancestor_Is_Subtyp then | |
2653 | Discr_Expr := New_Copy_Tree (Node (D_Val)); | |
2654 | else | |
2655 | Discr_Expr := | |
2656 | Make_Selected_Component (Loc, | |
2657 | Prefix => Duplicate_Subexpr (Ancestor), | |
2658 | Selector_Name => New_Occurrence_Of (Discr, Loc)); | |
2659 | end if; | |
2660 | ||
2661 | Resolve_Aggr_Expr (Discr_Expr, Discr); | |
f104fca1 | 2662 | Set_Inherited_Discriminant (Last (New_Assoc_List)); |
996ae0b0 RK |
2663 | return False; |
2664 | end if; | |
2665 | ||
2666 | Next_Discriminant (D); | |
2667 | ||
2668 | if Ancestor_Is_Subtyp then | |
2669 | Next_Elmt (D_Val); | |
2670 | end if; | |
2671 | end loop; | |
2672 | ||
2673 | return True; | |
2674 | end Discr_Present; | |
2675 | ||
2676 | --------------- | |
2677 | -- Get_Value -- | |
2678 | --------------- | |
2679 | ||
2680 | function Get_Value | |
2681 | (Compon : Node_Id; | |
2682 | From : List_Id; | |
2683 | Consider_Others_Choice : Boolean := False) | |
2684 | return Node_Id | |
2685 | is | |
2686 | Assoc : Node_Id; | |
2687 | Expr : Node_Id := Empty; | |
2688 | Selector_Name : Node_Id; | |
2689 | ||
2690 | begin | |
9b96e234 | 2691 | Is_Box_Present := False; |
65356e64 | 2692 | |
996ae0b0 RK |
2693 | if Present (From) then |
2694 | Assoc := First (From); | |
2695 | else | |
2696 | return Empty; | |
2697 | end if; | |
2698 | ||
2699 | while Present (Assoc) loop | |
2700 | Selector_Name := First (Choices (Assoc)); | |
2701 | while Present (Selector_Name) loop | |
2702 | if Nkind (Selector_Name) = N_Others_Choice then | |
2703 | if Consider_Others_Choice and then No (Expr) then | |
996ae0b0 RK |
2704 | |
2705 | -- We need to duplicate the expression for each | |
2706 | -- successive component covered by the others choice. | |
fbf5a39b AC |
2707 | -- This is redundant if the others_choice covers only |
2708 | -- one component (small optimization possible???), but | |
2709 | -- indispensable otherwise, because each one must be | |
2710 | -- expanded individually to preserve side-effects. | |
996ae0b0 | 2711 | |
0ab80019 AC |
2712 | -- Ada 2005 (AI-287): In case of default initialization |
2713 | -- of components, we duplicate the corresponding default | |
88b32fc3 BD |
2714 | -- expression (from the record type declaration). The |
2715 | -- copy must carry the sloc of the association (not the | |
2716 | -- original expression) to prevent spurious elaboration | |
2717 | -- checks when the default includes function calls. | |
19f0526a | 2718 | |
65356e64 | 2719 | if Box_Present (Assoc) then |
9b96e234 JM |
2720 | Others_Box := True; |
2721 | Is_Box_Present := True; | |
65356e64 AC |
2722 | |
2723 | if Expander_Active then | |
88b32fc3 BD |
2724 | return |
2725 | New_Copy_Tree | |
2726 | (Expression (Parent (Compon)), | |
2727 | New_Sloc => Sloc (Assoc)); | |
65356e64 AC |
2728 | else |
2729 | return Expression (Parent (Compon)); | |
2730 | end if; | |
65356e64 | 2731 | |
d05ef0ab | 2732 | else |
65356e64 AC |
2733 | if Present (Others_Etype) and then |
2734 | Base_Type (Others_Etype) /= Base_Type (Etype | |
2735 | (Compon)) | |
2736 | then | |
2737 | Error_Msg_N ("components in OTHERS choice must " & | |
2738 | "have same type", Selector_Name); | |
2739 | end if; | |
2740 | ||
2741 | Others_Etype := Etype (Compon); | |
2742 | ||
2743 | if Expander_Active then | |
2744 | return New_Copy_Tree (Expression (Assoc)); | |
2745 | else | |
2746 | return Expression (Assoc); | |
2747 | end if; | |
996ae0b0 RK |
2748 | end if; |
2749 | end if; | |
2750 | ||
2751 | elsif Chars (Compon) = Chars (Selector_Name) then | |
2752 | if No (Expr) then | |
fbf5a39b | 2753 | |
0ab80019 | 2754 | -- Ada 2005 (AI-231) |
2820d220 | 2755 | |
0ab80019 | 2756 | if Ada_Version >= Ada_05 |
8133b9d1 | 2757 | and then Known_Null (Expression (Assoc)) |
2820d220 | 2758 | then |
82c80734 | 2759 | Check_Can_Never_Be_Null (Compon, Expression (Assoc)); |
2820d220 AC |
2760 | end if; |
2761 | ||
996ae0b0 RK |
2762 | -- We need to duplicate the expression when several |
2763 | -- components are grouped together with a "|" choice. | |
2764 | -- For instance "filed1 | filed2 => Expr" | |
2765 | ||
0ab80019 | 2766 | -- Ada 2005 (AI-287) |
2820d220 | 2767 | |
65356e64 | 2768 | if Box_Present (Assoc) then |
9b96e234 | 2769 | Is_Box_Present := True; |
65356e64 AC |
2770 | |
2771 | -- Duplicate the default expression of the component | |
c7ce71c2 ES |
2772 | -- from the record type declaration, so a new copy |
2773 | -- can be attached to the association. | |
65356e64 | 2774 | |
c7ce71c2 ES |
2775 | -- Note that we always copy the default expression, |
2776 | -- even when the association has a single choice, in | |
2777 | -- order to create a proper association for the | |
2778 | -- expanded aggregate. | |
2779 | ||
2780 | Expr := New_Copy_Tree (Expression (Parent (Compon))); | |
65356e64 | 2781 | |
d05ef0ab | 2782 | else |
65356e64 AC |
2783 | if Present (Next (Selector_Name)) then |
2784 | Expr := New_Copy_Tree (Expression (Assoc)); | |
2785 | else | |
2786 | Expr := Expression (Assoc); | |
2787 | end if; | |
996ae0b0 RK |
2788 | end if; |
2789 | ||
55603e5e | 2790 | Generate_Reference (Compon, Selector_Name, 'm'); |
fbf5a39b | 2791 | |
996ae0b0 RK |
2792 | else |
2793 | Error_Msg_NE | |
2794 | ("more than one value supplied for &", | |
2795 | Selector_Name, Compon); | |
2796 | ||
2797 | end if; | |
2798 | end if; | |
2799 | ||
2800 | Next (Selector_Name); | |
2801 | end loop; | |
2802 | ||
2803 | Next (Assoc); | |
2804 | end loop; | |
2805 | ||
2806 | return Expr; | |
2807 | end Get_Value; | |
2808 | ||
2809 | ----------------------- | |
2810 | -- Resolve_Aggr_Expr -- | |
2811 | ----------------------- | |
2812 | ||
2813 | procedure Resolve_Aggr_Expr (Expr : Node_Id; Component : Node_Id) is | |
2814 | New_C : Entity_Id := Component; | |
2815 | Expr_Type : Entity_Id := Empty; | |
2816 | ||
2817 | function Has_Expansion_Delayed (Expr : Node_Id) return Boolean; | |
2818 | -- If the expression is an aggregate (possibly qualified) then its | |
2819 | -- expansion is delayed until the enclosing aggregate is expanded | |
2820 | -- into assignments. In that case, do not generate checks on the | |
2821 | -- expression, because they will be generated later, and will other- | |
2822 | -- wise force a copy (to remove side-effects) that would leave a | |
2823 | -- dynamic-sized aggregate in the code, something that gigi cannot | |
2824 | -- handle. | |
2825 | ||
2826 | Relocate : Boolean; | |
2827 | -- Set to True if the resolved Expr node needs to be relocated | |
2828 | -- when attached to the newly created association list. This node | |
2829 | -- need not be relocated if its parent pointer is not set. | |
2830 | -- In fact in this case Expr is the output of a New_Copy_Tree call. | |
2831 | -- if Relocate is True then we have analyzed the expression node | |
2832 | -- in the original aggregate and hence it needs to be relocated | |
2833 | -- when moved over the new association list. | |
2834 | ||
2835 | function Has_Expansion_Delayed (Expr : Node_Id) return Boolean is | |
2836 | Kind : constant Node_Kind := Nkind (Expr); | |
996ae0b0 | 2837 | begin |
f53f9dd7 | 2838 | return (Nkind_In (Kind, N_Aggregate, N_Extension_Aggregate) |
996ae0b0 RK |
2839 | and then Present (Etype (Expr)) |
2840 | and then Is_Record_Type (Etype (Expr)) | |
2841 | and then Expansion_Delayed (Expr)) | |
996ae0b0 RK |
2842 | or else (Kind = N_Qualified_Expression |
2843 | and then Has_Expansion_Delayed (Expression (Expr))); | |
2844 | end Has_Expansion_Delayed; | |
2845 | ||
2846 | -- Start of processing for Resolve_Aggr_Expr | |
2847 | ||
2848 | begin | |
2849 | -- If the type of the component is elementary or the type of the | |
2850 | -- aggregate does not contain discriminants, use the type of the | |
2851 | -- component to resolve Expr. | |
2852 | ||
2853 | if Is_Elementary_Type (Etype (Component)) | |
2854 | or else not Has_Discriminants (Etype (N)) | |
2855 | then | |
2856 | Expr_Type := Etype (Component); | |
2857 | ||
2858 | -- Otherwise we have to pick up the new type of the component from | |
12a13f01 | 2859 | -- the new constrained subtype of the aggregate. In fact components |
996ae0b0 RK |
2860 | -- which are of a composite type might be constrained by a |
2861 | -- discriminant, and we want to resolve Expr against the subtype were | |
2862 | -- all discriminant occurrences are replaced with their actual value. | |
2863 | ||
2864 | else | |
2865 | New_C := First_Component (Etype (N)); | |
2866 | while Present (New_C) loop | |
2867 | if Chars (New_C) = Chars (Component) then | |
2868 | Expr_Type := Etype (New_C); | |
2869 | exit; | |
2870 | end if; | |
2871 | ||
2872 | Next_Component (New_C); | |
2873 | end loop; | |
2874 | ||
2875 | pragma Assert (Present (Expr_Type)); | |
2876 | ||
2877 | -- For each range in an array type where a discriminant has been | |
2878 | -- replaced with the constraint, check that this range is within | |
ec53a6da JM |
2879 | -- the range of the base type. This checks is done in the init |
2880 | -- proc for regular objects, but has to be done here for | |
fbf5a39b | 2881 | -- aggregates since no init proc is called for them. |
996ae0b0 RK |
2882 | |
2883 | if Is_Array_Type (Expr_Type) then | |
2884 | declare | |
7f9747c6 | 2885 | Index : Node_Id; |
ec53a6da | 2886 | -- Range of the current constrained index in the array |
996ae0b0 | 2887 | |
ec53a6da | 2888 | Orig_Index : Node_Id := First_Index (Etype (Component)); |
996ae0b0 RK |
2889 | -- Range corresponding to the range Index above in the |
2890 | -- original unconstrained record type. The bounds of this | |
2891 | -- range may be governed by discriminants. | |
2892 | ||
2893 | Unconstr_Index : Node_Id := First_Index (Etype (Expr_Type)); | |
2894 | -- Range corresponding to the range Index above for the | |
2895 | -- unconstrained array type. This range is needed to apply | |
2896 | -- range checks. | |
2897 | ||
2898 | begin | |
7f9747c6 | 2899 | Index := First_Index (Expr_Type); |
996ae0b0 RK |
2900 | while Present (Index) loop |
2901 | if Depends_On_Discriminant (Orig_Index) then | |
2902 | Apply_Range_Check (Index, Etype (Unconstr_Index)); | |
2903 | end if; | |
2904 | ||
2905 | Next_Index (Index); | |
2906 | Next_Index (Orig_Index); | |
2907 | Next_Index (Unconstr_Index); | |
2908 | end loop; | |
2909 | end; | |
2910 | end if; | |
2911 | end if; | |
2912 | ||
2913 | -- If the Parent pointer of Expr is not set, Expr is an expression | |
2914 | -- duplicated by New_Tree_Copy (this happens for record aggregates | |
2915 | -- that look like (Field1 | Filed2 => Expr) or (others => Expr)). | |
2916 | -- Such a duplicated expression must be attached to the tree | |
2917 | -- before analysis and resolution to enforce the rule that a tree | |
2918 | -- fragment should never be analyzed or resolved unless it is | |
2919 | -- attached to the current compilation unit. | |
2920 | ||
2921 | if No (Parent (Expr)) then | |
2922 | Set_Parent (Expr, N); | |
2923 | Relocate := False; | |
2924 | else | |
2925 | Relocate := True; | |
2926 | end if; | |
2927 | ||
2928 | Analyze_And_Resolve (Expr, Expr_Type); | |
ca44152f | 2929 | Check_Expr_OK_In_Limited_Aggregate (Expr); |
996ae0b0 | 2930 | Check_Non_Static_Context (Expr); |
fbf5a39b | 2931 | Check_Unset_Reference (Expr); |
996ae0b0 | 2932 | |
0c020dde AC |
2933 | -- Check wrong use of class-wide types |
2934 | ||
7b4db06c | 2935 | if Is_Class_Wide_Type (Etype (Expr)) then |
0c020dde AC |
2936 | Error_Msg_N ("dynamically tagged expression not allowed", Expr); |
2937 | end if; | |
2938 | ||
996ae0b0 RK |
2939 | if not Has_Expansion_Delayed (Expr) then |
2940 | Aggregate_Constraint_Checks (Expr, Expr_Type); | |
2941 | end if; | |
2942 | ||
2943 | if Raises_Constraint_Error (Expr) then | |
2944 | Set_Raises_Constraint_Error (N); | |
2945 | end if; | |
2946 | ||
d79e621a GD |
2947 | -- If the expression has been marked as requiring a range check, |
2948 | -- then generate it here. | |
2949 | ||
2950 | if Do_Range_Check (Expr) then | |
2951 | Set_Do_Range_Check (Expr, False); | |
2952 | Generate_Range_Check (Expr, Expr_Type, CE_Range_Check_Failed); | |
2953 | end if; | |
2954 | ||
996ae0b0 | 2955 | if Relocate then |
107b023c | 2956 | Add_Association (New_C, Relocate_Node (Expr), New_Assoc_List); |
996ae0b0 | 2957 | else |
107b023c | 2958 | Add_Association (New_C, Expr, New_Assoc_List); |
996ae0b0 | 2959 | end if; |
996ae0b0 RK |
2960 | end Resolve_Aggr_Expr; |
2961 | ||
996ae0b0 RK |
2962 | -- Start of processing for Resolve_Record_Aggregate |
2963 | ||
2964 | begin | |
2965 | -- We may end up calling Duplicate_Subexpr on expressions that are | |
2966 | -- attached to New_Assoc_List. For this reason we need to attach it | |
2967 | -- to the tree by setting its parent pointer to N. This parent point | |
2968 | -- will change in STEP 8 below. | |
2969 | ||
2970 | Set_Parent (New_Assoc_List, N); | |
2971 | ||
2972 | -- STEP 1: abstract type and null record verification | |
2973 | ||
aad93b55 | 2974 | if Is_Abstract_Type (Typ) then |
996ae0b0 RK |
2975 | Error_Msg_N ("type of aggregate cannot be abstract", N); |
2976 | end if; | |
2977 | ||
2978 | if No (First_Entity (Typ)) and then Null_Record_Present (N) then | |
2979 | Set_Etype (N, Typ); | |
2980 | return; | |
2981 | ||
2982 | elsif Present (First_Entity (Typ)) | |
2983 | and then Null_Record_Present (N) | |
2984 | and then not Is_Tagged_Type (Typ) | |
2985 | then | |
2986 | Error_Msg_N ("record aggregate cannot be null", N); | |
2987 | return; | |
2988 | ||
eff332d9 GD |
2989 | -- If the type has no components, then the aggregate should either |
2990 | -- have "null record", or in Ada 2005 it could instead have a single | |
2991 | -- component association given by "others => <>". For Ada 95 we flag | |
2992 | -- an error at this point, but for Ada 2005 we proceed with checking | |
2993 | -- the associations below, which will catch the case where it's not | |
2994 | -- an aggregate with "others => <>". Note that the legality of a <> | |
2995 | -- aggregate for a null record type was established by AI05-016. | |
2996 | ||
2997 | elsif No (First_Entity (Typ)) | |
2998 | and then Ada_Version < Ada_05 | |
2999 | then | |
996ae0b0 RK |
3000 | Error_Msg_N ("record aggregate must be null", N); |
3001 | return; | |
3002 | end if; | |
3003 | ||
3004 | -- STEP 2: Verify aggregate structure | |
3005 | ||
3006 | Step_2 : declare | |
3007 | Selector_Name : Node_Id; | |
3008 | Bad_Aggregate : Boolean := False; | |
3009 | ||
3010 | begin | |
3011 | if Present (Component_Associations (N)) then | |
3012 | Assoc := First (Component_Associations (N)); | |
3013 | else | |
3014 | Assoc := Empty; | |
3015 | end if; | |
3016 | ||
3017 | while Present (Assoc) loop | |
3018 | Selector_Name := First (Choices (Assoc)); | |
3019 | while Present (Selector_Name) loop | |
3020 | if Nkind (Selector_Name) = N_Identifier then | |
3021 | null; | |
3022 | ||
3023 | elsif Nkind (Selector_Name) = N_Others_Choice then | |
3024 | if Selector_Name /= First (Choices (Assoc)) | |
3025 | or else Present (Next (Selector_Name)) | |
3026 | then | |
ed2233dc | 3027 | Error_Msg_N |
22cb89b5 AC |
3028 | ("OTHERS must appear alone in a choice list", |
3029 | Selector_Name); | |
996ae0b0 RK |
3030 | return; |
3031 | ||
3032 | elsif Present (Next (Assoc)) then | |
ed2233dc | 3033 | Error_Msg_N |
22cb89b5 AC |
3034 | ("OTHERS must appear last in an aggregate", |
3035 | Selector_Name); | |
996ae0b0 | 3036 | return; |
1ab9541b ES |
3037 | |
3038 | -- (Ada2005): If this is an association with a box, | |
3039 | -- indicate that the association need not represent | |
3040 | -- any component. | |
3041 | ||
3042 | elsif Box_Present (Assoc) then | |
3043 | Others_Box := True; | |
996ae0b0 RK |
3044 | end if; |
3045 | ||
3046 | else | |
3047 | Error_Msg_N | |
3048 | ("selector name should be identifier or OTHERS", | |
3049 | Selector_Name); | |
3050 | Bad_Aggregate := True; | |
3051 | end if; | |
3052 | ||
3053 | Next (Selector_Name); | |
3054 | end loop; | |
3055 | ||
3056 | Next (Assoc); | |
3057 | end loop; | |
3058 | ||
3059 | if Bad_Aggregate then | |
3060 | return; | |
3061 | end if; | |
3062 | end Step_2; | |
3063 | ||
3064 | -- STEP 3: Find discriminant Values | |
3065 | ||
3066 | Step_3 : declare | |
3067 | Discrim : Entity_Id; | |
3068 | Missing_Discriminants : Boolean := False; | |
3069 | ||
3070 | begin | |
3071 | if Present (Expressions (N)) then | |
3072 | Positional_Expr := First (Expressions (N)); | |
3073 | else | |
3074 | Positional_Expr := Empty; | |
3075 | end if; | |
3076 | ||
9013065b AC |
3077 | if Has_Unknown_Discriminants (Typ) |
3078 | and then Present (Underlying_Record_View (Typ)) | |
3079 | then | |
3080 | Discrim := First_Discriminant (Underlying_Record_View (Typ)); | |
3081 | elsif Has_Discriminants (Typ) then | |
996ae0b0 RK |
3082 | Discrim := First_Discriminant (Typ); |
3083 | else | |
3084 | Discrim := Empty; | |
3085 | end if; | |
3086 | ||
3087 | -- First find the discriminant values in the positional components | |
3088 | ||
3089 | while Present (Discrim) and then Present (Positional_Expr) loop | |
3090 | if Discr_Present (Discrim) then | |
3091 | Resolve_Aggr_Expr (Positional_Expr, Discrim); | |
2820d220 | 3092 | |
0ab80019 | 3093 | -- Ada 2005 (AI-231) |
2820d220 | 3094 | |
ec53a6da | 3095 | if Ada_Version >= Ada_05 |
8133b9d1 | 3096 | and then Known_Null (Positional_Expr) |
ec53a6da | 3097 | then |
82c80734 | 3098 | Check_Can_Never_Be_Null (Discrim, Positional_Expr); |
2820d220 AC |
3099 | end if; |
3100 | ||
996ae0b0 RK |
3101 | Next (Positional_Expr); |
3102 | end if; | |
3103 | ||
3104 | if Present (Get_Value (Discrim, Component_Associations (N))) then | |
3105 | Error_Msg_NE | |
3106 | ("more than one value supplied for discriminant&", | |
3107 | N, Discrim); | |
3108 | end if; | |
3109 | ||
3110 | Next_Discriminant (Discrim); | |
3111 | end loop; | |
3112 | ||
3113 | -- Find remaining discriminant values, if any, among named components | |
3114 | ||
3115 | while Present (Discrim) loop | |
3116 | Expr := Get_Value (Discrim, Component_Associations (N), True); | |
3117 | ||
3118 | if not Discr_Present (Discrim) then | |
3119 | if Present (Expr) then | |
3120 | Error_Msg_NE | |
3121 | ("more than one value supplied for discriminant&", | |
3122 | N, Discrim); | |
3123 | end if; | |
3124 | ||
3125 | elsif No (Expr) then | |
3126 | Error_Msg_NE | |
3127 | ("no value supplied for discriminant &", N, Discrim); | |
3128 | Missing_Discriminants := True; | |
3129 | ||
3130 | else | |
3131 | Resolve_Aggr_Expr (Expr, Discrim); | |
3132 | end if; | |
3133 | ||
3134 | Next_Discriminant (Discrim); | |
3135 | end loop; | |
3136 | ||
3137 | if Missing_Discriminants then | |
3138 | return; | |
3139 | end if; | |
3140 | ||
3141 | -- At this point and until the beginning of STEP 6, New_Assoc_List | |
3142 | -- contains only the discriminants and their values. | |
3143 | ||
3144 | end Step_3; | |
3145 | ||
3146 | -- STEP 4: Set the Etype of the record aggregate | |
3147 | ||
3148 | -- ??? This code is pretty much a copy of Sem_Ch3.Build_Subtype. That | |
3149 | -- routine should really be exported in sem_util or some such and used | |
3150 | -- in sem_ch3 and here rather than have a copy of the code which is a | |
3151 | -- maintenance nightmare. | |
3152 | ||
12a13f01 | 3153 | -- ??? Performance WARNING. The current implementation creates a new |
996ae0b0 RK |
3154 | -- itype for all aggregates whose base type is discriminated. |
3155 | -- This means that for record aggregates nested inside an array | |
3156 | -- aggregate we will create a new itype for each record aggregate | |
12a13f01 | 3157 | -- if the array component type has discriminants. For large aggregates |
996ae0b0 RK |
3158 | -- this may be a problem. What should be done in this case is |
3159 | -- to reuse itypes as much as possible. | |
3160 | ||
9013065b AC |
3161 | if Has_Discriminants (Typ) |
3162 | or else (Has_Unknown_Discriminants (Typ) | |
3163 | and then Present (Underlying_Record_View (Typ))) | |
3164 | then | |
996ae0b0 RK |
3165 | Build_Constrained_Itype : declare |
3166 | Loc : constant Source_Ptr := Sloc (N); | |
3167 | Indic : Node_Id; | |
3168 | Subtyp_Decl : Node_Id; | |
3169 | Def_Id : Entity_Id; | |
3170 | ||
fbf5a39b | 3171 | C : constant List_Id := New_List; |
996ae0b0 RK |
3172 | |
3173 | begin | |
3174 | New_Assoc := First (New_Assoc_List); | |
3175 | while Present (New_Assoc) loop | |
3176 | Append (Duplicate_Subexpr (Expression (New_Assoc)), To => C); | |
3177 | Next (New_Assoc); | |
3178 | end loop; | |
3179 | ||
9013065b AC |
3180 | if Has_Unknown_Discriminants (Typ) |
3181 | and then Present (Underlying_Record_View (Typ)) | |
3182 | then | |
3183 | Indic := | |
3184 | Make_Subtype_Indication (Loc, | |
3185 | Subtype_Mark => | |
3186 | New_Occurrence_Of (Underlying_Record_View (Typ), Loc), | |
3187 | Constraint => | |
3188 | Make_Index_Or_Discriminant_Constraint (Loc, C)); | |
3189 | else | |
3190 | Indic := | |
3191 | Make_Subtype_Indication (Loc, | |
3192 | Subtype_Mark => | |
3193 | New_Occurrence_Of (Base_Type (Typ), Loc), | |
3194 | Constraint => | |
3195 | Make_Index_Or_Discriminant_Constraint (Loc, C)); | |
3196 | end if; | |
996ae0b0 RK |
3197 | |
3198 | Def_Id := Create_Itype (Ekind (Typ), N); | |
3199 | ||
3200 | Subtyp_Decl := | |
3201 | Make_Subtype_Declaration (Loc, | |
3202 | Defining_Identifier => Def_Id, | |
3203 | Subtype_Indication => Indic); | |
3204 | Set_Parent (Subtyp_Decl, Parent (N)); | |
3205 | ||
ec53a6da | 3206 | -- Itypes must be analyzed with checks off (see itypes.ads) |
996ae0b0 RK |
3207 | |
3208 | Analyze (Subtyp_Decl, Suppress => All_Checks); | |
3209 | ||
3210 | Set_Etype (N, Def_Id); | |
3211 | Check_Static_Discriminated_Subtype | |
3212 | (Def_Id, Expression (First (New_Assoc_List))); | |
3213 | end Build_Constrained_Itype; | |
3214 | ||
3215 | else | |
3216 | Set_Etype (N, Typ); | |
3217 | end if; | |
3218 | ||
3219 | -- STEP 5: Get remaining components according to discriminant values | |
3220 | ||
3221 | Step_5 : declare | |
3222 | Record_Def : Node_Id; | |
3223 | Parent_Typ : Entity_Id; | |
3224 | Root_Typ : Entity_Id; | |
3225 | Parent_Typ_List : Elist_Id; | |
3226 | Parent_Elmt : Elmt_Id; | |
3227 | Errors_Found : Boolean := False; | |
3228 | Dnode : Node_Id; | |
3229 | ||
3230 | begin | |
3231 | if Is_Derived_Type (Typ) and then Is_Tagged_Type (Typ) then | |
3232 | Parent_Typ_List := New_Elmt_List; | |
3233 | ||
3234 | -- If this is an extension aggregate, the component list must | |
965dbd5c AC |
3235 | -- include all components that are not in the given ancestor type. |
3236 | -- Otherwise, the component list must include components of all | |
3237 | -- ancestors, starting with the root. | |
996ae0b0 RK |
3238 | |
3239 | if Nkind (N) = N_Extension_Aggregate then | |
7b4db06c | 3240 | Root_Typ := Base_Type (Etype (Ancestor_Part (N))); |
69a0c174 | 3241 | |
996ae0b0 RK |
3242 | else |
3243 | Root_Typ := Root_Type (Typ); | |
3244 | ||
f53f9dd7 RD |
3245 | if Nkind (Parent (Base_Type (Root_Typ))) = |
3246 | N_Private_Type_Declaration | |
996ae0b0 | 3247 | then |
ed2233dc | 3248 | Error_Msg_NE |
996ae0b0 RK |
3249 | ("type of aggregate has private ancestor&!", |
3250 | N, Root_Typ); | |
ed2233dc | 3251 | Error_Msg_N ("must use extension aggregate!", N); |
996ae0b0 RK |
3252 | return; |
3253 | end if; | |
3254 | ||
3255 | Dnode := Declaration_Node (Base_Type (Root_Typ)); | |
3256 | ||
4519314c AC |
3257 | -- If we don't get a full declaration, then we have some error |
3258 | -- which will get signalled later so skip this part. Otherwise | |
3259 | -- gather components of root that apply to the aggregate type. | |
3260 | -- We use the base type in case there is an applicable stored | |
3261 | -- constraint that renames the discriminants of the root. | |
996ae0b0 RK |
3262 | |
3263 | if Nkind (Dnode) = N_Full_Type_Declaration then | |
3264 | Record_Def := Type_Definition (Dnode); | |
07fc65c4 | 3265 | Gather_Components (Base_Type (Typ), |
996ae0b0 RK |
3266 | Component_List (Record_Def), |
3267 | Governed_By => New_Assoc_List, | |
3268 | Into => Components, | |
3269 | Report_Errors => Errors_Found); | |
3270 | end if; | |
3271 | end if; | |
3272 | ||
9013065b | 3273 | Parent_Typ := Base_Type (Typ); |
996ae0b0 | 3274 | while Parent_Typ /= Root_Typ loop |
996ae0b0 RK |
3275 | Prepend_Elmt (Parent_Typ, To => Parent_Typ_List); |
3276 | Parent_Typ := Etype (Parent_Typ); | |
3277 | ||
fbf5a39b | 3278 | if Nkind (Parent (Base_Type (Parent_Typ))) = |
996ae0b0 | 3279 | N_Private_Type_Declaration |
fbf5a39b AC |
3280 | or else Nkind (Parent (Base_Type (Parent_Typ))) = |
3281 | N_Private_Extension_Declaration | |
996ae0b0 RK |
3282 | then |
3283 | if Nkind (N) /= N_Extension_Aggregate then | |
ed2233dc | 3284 | Error_Msg_NE |
996ae0b0 RK |
3285 | ("type of aggregate has private ancestor&!", |
3286 | N, Parent_Typ); | |
ed2233dc | 3287 | Error_Msg_N ("must use extension aggregate!", N); |
996ae0b0 RK |
3288 | return; |
3289 | ||
3290 | elsif Parent_Typ /= Root_Typ then | |
3291 | Error_Msg_NE | |
3292 | ("ancestor part of aggregate must be private type&", | |
3293 | Ancestor_Part (N), Parent_Typ); | |
3294 | return; | |
3295 | end if; | |
4519314c AC |
3296 | |
3297 | -- The current view of ancestor part may be a private type, | |
3298 | -- while the context type is always non-private. | |
3299 | ||
3300 | elsif Is_Private_Type (Root_Typ) | |
3301 | and then Present (Full_View (Root_Typ)) | |
3302 | and then Nkind (N) = N_Extension_Aggregate | |
3303 | then | |
3304 | exit when Base_Type (Full_View (Root_Typ)) = Parent_Typ; | |
996ae0b0 RK |
3305 | end if; |
3306 | end loop; | |
3307 | ||
bf06d37f AC |
3308 | -- Now collect components from all other ancestors, beginning |
3309 | -- with the current type. If the type has unknown discriminants | |
349ff68f | 3310 | -- use the component list of the Underlying_Record_View, which |
bf06d37f AC |
3311 | -- needs to be used for the subsequent expansion of the aggregate |
3312 | -- into assignments. | |
996ae0b0 RK |
3313 | |
3314 | Parent_Elmt := First_Elmt (Parent_Typ_List); | |
3315 | while Present (Parent_Elmt) loop | |
3316 | Parent_Typ := Node (Parent_Elmt); | |
bf06d37f AC |
3317 | |
3318 | if Has_Unknown_Discriminants (Parent_Typ) | |
3319 | and then Present (Underlying_Record_View (Typ)) | |
3320 | then | |
3321 | Parent_Typ := Underlying_Record_View (Parent_Typ); | |
3322 | end if; | |
3323 | ||
996ae0b0 RK |
3324 | Record_Def := Type_Definition (Parent (Base_Type (Parent_Typ))); |
3325 | Gather_Components (Empty, | |
3326 | Component_List (Record_Extension_Part (Record_Def)), | |
3327 | Governed_By => New_Assoc_List, | |
3328 | Into => Components, | |
3329 | Report_Errors => Errors_Found); | |
3330 | ||
3331 | Next_Elmt (Parent_Elmt); | |
3332 | end loop; | |
3333 | ||
3334 | else | |
6bde3eb5 | 3335 | Record_Def := Type_Definition (Parent (Base_Type (Typ))); |
996ae0b0 RK |
3336 | |
3337 | if Null_Present (Record_Def) then | |
3338 | null; | |
bf06d37f AC |
3339 | |
3340 | elsif not Has_Unknown_Discriminants (Typ) then | |
07fc65c4 | 3341 | Gather_Components (Base_Type (Typ), |
996ae0b0 RK |
3342 | Component_List (Record_Def), |
3343 | Governed_By => New_Assoc_List, | |
3344 | Into => Components, | |
3345 | Report_Errors => Errors_Found); | |
bf06d37f AC |
3346 | |
3347 | else | |
3348 | Gather_Components | |
3349 | (Base_Type (Underlying_Record_View (Typ)), | |
3350 | Component_List (Record_Def), | |
3351 | Governed_By => New_Assoc_List, | |
3352 | Into => Components, | |
3353 | Report_Errors => Errors_Found); | |
996ae0b0 RK |
3354 | end if; |
3355 | end if; | |
3356 | ||
3357 | if Errors_Found then | |
3358 | return; | |
3359 | end if; | |
3360 | end Step_5; | |
3361 | ||
3362 | -- STEP 6: Find component Values | |
3363 | ||
3364 | Component := Empty; | |
3365 | Component_Elmt := First_Elmt (Components); | |
3366 | ||
3367 | -- First scan the remaining positional associations in the aggregate. | |
3368 | -- Remember that at this point Positional_Expr contains the current | |
3369 | -- positional association if any is left after looking for discriminant | |
3370 | -- values in step 3. | |
3371 | ||
3372 | while Present (Positional_Expr) and then Present (Component_Elmt) loop | |
3373 | Component := Node (Component_Elmt); | |
3374 | Resolve_Aggr_Expr (Positional_Expr, Component); | |
3375 | ||
0ab80019 AC |
3376 | -- Ada 2005 (AI-231) |
3377 | ||
ec53a6da | 3378 | if Ada_Version >= Ada_05 |
8133b9d1 | 3379 | and then Known_Null (Positional_Expr) |
ec53a6da | 3380 | then |
82c80734 | 3381 | Check_Can_Never_Be_Null (Component, Positional_Expr); |
2820d220 AC |
3382 | end if; |
3383 | ||
996ae0b0 RK |
3384 | if Present (Get_Value (Component, Component_Associations (N))) then |
3385 | Error_Msg_NE | |
3386 | ("more than one value supplied for Component &", N, Component); | |
3387 | end if; | |
3388 | ||
3389 | Next (Positional_Expr); | |
3390 | Next_Elmt (Component_Elmt); | |
3391 | end loop; | |
3392 | ||
3393 | if Present (Positional_Expr) then | |
3394 | Error_Msg_N | |
3395 | ("too many components for record aggregate", Positional_Expr); | |
3396 | end if; | |
3397 | ||
3398 | -- Now scan for the named arguments of the aggregate | |
3399 | ||
3400 | while Present (Component_Elmt) loop | |
3401 | Component := Node (Component_Elmt); | |
3402 | Expr := Get_Value (Component, Component_Associations (N), True); | |
3403 | ||
9b96e234 | 3404 | -- Note: The previous call to Get_Value sets the value of the |
f91e8020 | 3405 | -- variable Is_Box_Present. |
65356e64 | 3406 | |
9b96e234 JM |
3407 | -- Ada 2005 (AI-287): Handle components with default initialization. |
3408 | -- Note: This feature was originally added to Ada 2005 for limited | |
3409 | -- but it was finally allowed with any type. | |
65356e64 | 3410 | |
9b96e234 | 3411 | if Is_Box_Present then |
f91e8020 GD |
3412 | Check_Box_Component : declare |
3413 | Ctyp : constant Entity_Id := Etype (Component); | |
9b96e234 JM |
3414 | |
3415 | begin | |
c7ce71c2 ES |
3416 | -- If there is a default expression for the aggregate, copy |
3417 | -- it into a new association. | |
3418 | ||
9b96e234 JM |
3419 | -- If the component has an initialization procedure (IP) we |
3420 | -- pass the component to the expander, which will generate | |
3421 | -- the call to such IP. | |
3422 | ||
c7ce71c2 ES |
3423 | -- If the component has discriminants, their values must |
3424 | -- be taken from their subtype. This is indispensable for | |
3425 | -- constraints that are given by the current instance of an | |
3426 | -- enclosing type, to allow the expansion of the aggregate | |
3427 | -- to replace the reference to the current instance by the | |
3428 | -- target object of the aggregate. | |
3429 | ||
3430 | if Present (Parent (Component)) | |
3431 | and then | |
3432 | Nkind (Parent (Component)) = N_Component_Declaration | |
3433 | and then Present (Expression (Parent (Component))) | |
aad93b55 | 3434 | then |
c7ce71c2 ES |
3435 | Expr := |
3436 | New_Copy_Tree (Expression (Parent (Component)), | |
3437 | New_Sloc => Sloc (N)); | |
3438 | ||
9b96e234 | 3439 | Add_Association |
107b023c AC |
3440 | (Component => Component, |
3441 | Expr => Expr, | |
3442 | Assoc_List => New_Assoc_List); | |
c7ce71c2 ES |
3443 | Set_Has_Self_Reference (N); |
3444 | ||
f91e8020 GD |
3445 | -- A box-defaulted access component gets the value null. Also |
3446 | -- included are components of private types whose underlying | |
c80d4855 RD |
3447 | -- type is an access type. In either case set the type of the |
3448 | -- literal, for subsequent use in semantic checks. | |
f91e8020 GD |
3449 | |
3450 | elsif Present (Underlying_Type (Ctyp)) | |
3451 | and then Is_Access_Type (Underlying_Type (Ctyp)) | |
3452 | then | |
3453 | if not Is_Private_Type (Ctyp) then | |
c80d4855 RD |
3454 | Expr := Make_Null (Sloc (N)); |
3455 | Set_Etype (Expr, Ctyp); | |
f91e8020 | 3456 | Add_Association |
107b023c AC |
3457 | (Component => Component, |
3458 | Expr => Expr, | |
3459 | Assoc_List => New_Assoc_List); | |
f91e8020 GD |
3460 | |
3461 | -- If the component's type is private with an access type as | |
3462 | -- its underlying type then we have to create an unchecked | |
3463 | -- conversion to satisfy type checking. | |
3464 | ||
3465 | else | |
3466 | declare | |
3467 | Qual_Null : constant Node_Id := | |
3468 | Make_Qualified_Expression (Sloc (N), | |
3469 | Subtype_Mark => | |
3470 | New_Occurrence_Of | |
3471 | (Underlying_Type (Ctyp), Sloc (N)), | |
3472 | Expression => Make_Null (Sloc (N))); | |
3473 | ||
3474 | Convert_Null : constant Node_Id := | |
3475 | Unchecked_Convert_To | |
3476 | (Ctyp, Qual_Null); | |
3477 | ||
3478 | begin | |
3479 | Analyze_And_Resolve (Convert_Null, Ctyp); | |
3480 | Add_Association | |
107b023c AC |
3481 | (Component => Component, |
3482 | Expr => Convert_Null, | |
3483 | Assoc_List => New_Assoc_List); | |
f91e8020 GD |
3484 | end; |
3485 | end if; | |
3486 | ||
c7ce71c2 ES |
3487 | elsif Has_Non_Null_Base_Init_Proc (Ctyp) |
3488 | or else not Expander_Active | |
3489 | then | |
3490 | if Is_Record_Type (Ctyp) | |
3491 | and then Has_Discriminants (Ctyp) | |
6bde3eb5 | 3492 | and then not Is_Private_Type (Ctyp) |
c7ce71c2 ES |
3493 | then |
3494 | -- We build a partially initialized aggregate with the | |
3495 | -- values of the discriminants and box initialization | |
8133b9d1 | 3496 | -- for the rest, if other components are present. |
51ec70b8 | 3497 | -- The type of the aggregate is the known subtype of |
107b023c AC |
3498 | -- the component. The capture of discriminants must |
3499 | -- be recursive because subcomponents may be contrained | |
3500 | -- (transitively) by discriminants of enclosing types. | |
6bde3eb5 AC |
3501 | -- For a private type with discriminants, a call to the |
3502 | -- initialization procedure will be generated, and no | |
3503 | -- subaggregate is needed. | |
c7ce71c2 | 3504 | |
107b023c | 3505 | Capture_Discriminants : declare |
719aaf4d AC |
3506 | Loc : constant Source_Ptr := Sloc (N); |
3507 | Expr : Node_Id; | |
c7ce71c2 | 3508 | |
107b023c AC |
3509 | procedure Add_Discriminant_Values |
3510 | (New_Aggr : Node_Id; | |
3511 | Assoc_List : List_Id); | |
3512 | -- The constraint to a component may be given by a | |
3513 | -- discriminant of the enclosing type, in which case | |
3514 | -- we have to retrieve its value, which is part of the | |
3515 | -- enclosing aggregate. Assoc_List provides the | |
3516 | -- discriminant associations of the current type or | |
3517 | -- of some enclosing record. | |
3518 | ||
3519 | procedure Propagate_Discriminants | |
3520 | (Aggr : Node_Id; | |
3521 | Assoc_List : List_Id; | |
3522 | Comp : Entity_Id); | |
3523 | -- Nested components may themselves be discriminated | |
2be0bff8 | 3524 | -- types constrained by outer discriminants, whose |
107b023c AC |
3525 | -- values must be captured before the aggregate is |
3526 | -- expanded into assignments. | |
3527 | ||
3528 | ----------------------------- | |
3529 | -- Add_Discriminant_Values -- | |
3530 | ----------------------------- | |
3531 | ||
3532 | procedure Add_Discriminant_Values | |
3533 | (New_Aggr : Node_Id; | |
3534 | Assoc_List : List_Id) | |
3535 | is | |
3536 | Assoc : Node_Id; | |
3537 | Discr : Entity_Id; | |
3538 | Discr_Elmt : Elmt_Id; | |
3539 | Discr_Val : Node_Id; | |
3540 | Val : Entity_Id; | |
c7ce71c2 | 3541 | |
107b023c AC |
3542 | begin |
3543 | Discr := First_Discriminant (Etype (New_Aggr)); | |
3544 | Discr_Elmt := | |
3545 | First_Elmt | |
3546 | (Discriminant_Constraint (Etype (New_Aggr))); | |
3547 | while Present (Discr_Elmt) loop | |
3548 | Discr_Val := Node (Discr_Elmt); | |
3549 | ||
3550 | -- If the constraint is given by a discriminant | |
3551 | -- it is a discriminant of an enclosing record, | |
3552 | -- and its value has already been placed in the | |
3553 | -- association list. | |
3554 | ||
3555 | if Is_Entity_Name (Discr_Val) | |
3556 | and then | |
3557 | Ekind (Entity (Discr_Val)) = E_Discriminant | |
3558 | then | |
3559 | Val := Entity (Discr_Val); | |
3560 | ||
3561 | Assoc := First (Assoc_List); | |
3562 | while Present (Assoc) loop | |
3563 | if Present | |
3564 | (Entity (First (Choices (Assoc)))) | |
3565 | and then | |
3566 | Entity (First (Choices (Assoc))) | |
3567 | = Val | |
3568 | then | |
3569 | Discr_Val := Expression (Assoc); | |
3570 | exit; | |
3571 | end if; | |
3572 | Next (Assoc); | |
3573 | end loop; | |
3574 | end if; | |
157a9bf5 | 3575 | |
107b023c AC |
3576 | Add_Association |
3577 | (Discr, New_Copy_Tree (Discr_Val), | |
3578 | Component_Associations (New_Aggr)); | |
3579 | ||
3580 | -- If the discriminant constraint is a current | |
3581 | -- instance, mark the current aggregate so that | |
3582 | -- the self-reference can be expanded later. | |
3583 | ||
3584 | if Nkind (Discr_Val) = N_Attribute_Reference | |
3585 | and then Is_Entity_Name (Prefix (Discr_Val)) | |
3586 | and then Is_Type (Entity (Prefix (Discr_Val))) | |
3587 | and then Etype (N) = | |
3588 | Entity (Prefix (Discr_Val)) | |
3589 | then | |
3590 | Set_Has_Self_Reference (N); | |
3591 | end if; | |
c7ce71c2 | 3592 | |
107b023c AC |
3593 | Next_Elmt (Discr_Elmt); |
3594 | Next_Discriminant (Discr); | |
3595 | end loop; | |
3596 | end Add_Discriminant_Values; | |
3597 | ||
3598 | ------------------------------ | |
3599 | -- Propagate_Discriminants -- | |
3600 | ------------------------------ | |
3601 | ||
3602 | procedure Propagate_Discriminants | |
3603 | (Aggr : Node_Id; | |
3604 | Assoc_List : List_Id; | |
3605 | Comp : Entity_Id) | |
3606 | is | |
3607 | Inner_Comp : Entity_Id; | |
3608 | Comp_Type : Entity_Id; | |
3609 | Needs_Box : Boolean := False; | |
3610 | New_Aggr : Node_Id; | |
c7ce71c2 | 3611 | |
107b023c | 3612 | begin |
107b023c AC |
3613 | Inner_Comp := First_Component (Etype (Comp)); |
3614 | while Present (Inner_Comp) loop | |
3615 | Comp_Type := Etype (Inner_Comp); | |
c7ce71c2 | 3616 | |
107b023c AC |
3617 | if Is_Record_Type (Comp_Type) |
3618 | and then Has_Discriminants (Comp_Type) | |
3619 | then | |
3620 | New_Aggr := | |
3621 | Make_Aggregate (Loc, New_List, New_List); | |
3622 | Set_Etype (New_Aggr, Comp_Type); | |
3623 | Add_Association | |
3624 | (Inner_Comp, New_Aggr, | |
719aaf4d | 3625 | Component_Associations (Aggr)); |
8133b9d1 | 3626 | |
e264efcc | 3627 | -- Collect discriminant values and recurse |
107b023c AC |
3628 | |
3629 | Add_Discriminant_Values | |
3630 | (New_Aggr, Assoc_List); | |
3631 | Propagate_Discriminants | |
3632 | (New_Aggr, Assoc_List, Inner_Comp); | |
3633 | ||
3634 | else | |
3635 | Needs_Box := True; | |
8133b9d1 ES |
3636 | end if; |
3637 | ||
107b023c | 3638 | Next_Component (Inner_Comp); |
8133b9d1 | 3639 | end loop; |
107b023c AC |
3640 | |
3641 | if Needs_Box then | |
3642 | Append | |
3643 | (Make_Component_Association (Loc, | |
3644 | Choices => | |
3645 | New_List (Make_Others_Choice (Loc)), | |
3646 | Expression => Empty, | |
3647 | Box_Present => True), | |
3648 | Component_Associations (Aggr)); | |
3649 | end if; | |
3650 | end Propagate_Discriminants; | |
3651 | ||
3652 | begin | |
3653 | Expr := Make_Aggregate (Loc, New_List, New_List); | |
3654 | Set_Etype (Expr, Ctyp); | |
3655 | ||
3656 | -- If the enclosing type has discriminants, they | |
3657 | -- have been collected in the aggregate earlier, and | |
3658 | -- they may appear as constraints of subcomponents. | |
3659 | -- Similarly if this component has discriminants, they | |
2be0bff8 | 3660 | -- might in turn be propagated to their components. |
107b023c AC |
3661 | |
3662 | if Has_Discriminants (Typ) then | |
3663 | Add_Discriminant_Values (Expr, New_Assoc_List); | |
3664 | Propagate_Discriminants | |
3665 | (Expr, New_Assoc_List, Component); | |
3666 | ||
3667 | elsif Has_Discriminants (Ctyp) then | |
3668 | Add_Discriminant_Values | |
3669 | (Expr, Component_Associations (Expr)); | |
3670 | Propagate_Discriminants | |
3671 | (Expr, Component_Associations (Expr), Component); | |
3672 | ||
3673 | else | |
3674 | declare | |
719aaf4d | 3675 | Comp : Entity_Id; |
107b023c AC |
3676 | |
3677 | begin | |
3678 | -- If the type has additional components, create | |
2be0bff8 | 3679 | -- an OTHERS box association for them. |
107b023c AC |
3680 | |
3681 | Comp := First_Component (Ctyp); | |
3682 | while Present (Comp) loop | |
3683 | if Ekind (Comp) = E_Component then | |
3684 | if not Is_Record_Type (Etype (Comp)) then | |
3685 | Append | |
3686 | (Make_Component_Association (Loc, | |
3687 | Choices => | |
3688 | New_List | |
3689 | (Make_Others_Choice (Loc)), | |
3690 | Expression => Empty, | |
3691 | Box_Present => True), | |
3692 | Component_Associations (Expr)); | |
3693 | end if; | |
3694 | exit; | |
3695 | end if; | |
3696 | ||
3697 | Next_Component (Comp); | |
3698 | end loop; | |
3699 | end; | |
3700 | end if; | |
c7ce71c2 ES |
3701 | |
3702 | Add_Association | |
107b023c AC |
3703 | (Component => Component, |
3704 | Expr => Expr, | |
3705 | Assoc_List => New_Assoc_List); | |
3706 | end Capture_Discriminants; | |
c7ce71c2 ES |
3707 | |
3708 | else | |
3709 | Add_Association | |
3710 | (Component => Component, | |
3711 | Expr => Empty, | |
107b023c | 3712 | Assoc_List => New_Assoc_List, |
c7ce71c2 ES |
3713 | Is_Box_Present => True); |
3714 | end if; | |
9b96e234 JM |
3715 | |
3716 | -- Otherwise we only need to resolve the expression if the | |
3717 | -- component has partially initialized values (required to | |
3718 | -- expand the corresponding assignments and run-time checks). | |
3719 | ||
3720 | elsif Present (Expr) | |
f91e8020 | 3721 | and then Is_Partially_Initialized_Type (Ctyp) |
9b96e234 JM |
3722 | then |
3723 | Resolve_Aggr_Expr (Expr, Component); | |
3724 | end if; | |
f91e8020 | 3725 | end Check_Box_Component; |
615cbd95 | 3726 | |
65356e64 | 3727 | elsif No (Expr) then |
c7ce71c2 ES |
3728 | |
3729 | -- Ignore hidden components associated with the position of the | |
3730 | -- interface tags: these are initialized dynamically. | |
3731 | ||
c80d4855 | 3732 | if not Present (Related_Type (Component)) then |
c7ce71c2 ES |
3733 | Error_Msg_NE |
3734 | ("no value supplied for component &!", N, Component); | |
3735 | end if; | |
615cbd95 | 3736 | |
996ae0b0 RK |
3737 | else |
3738 | Resolve_Aggr_Expr (Expr, Component); | |
3739 | end if; | |
3740 | ||
3741 | Next_Elmt (Component_Elmt); | |
3742 | end loop; | |
3743 | ||
3744 | -- STEP 7: check for invalid components + check type in choice list | |
3745 | ||
3746 | Step_7 : declare | |
3747 | Selectr : Node_Id; | |
3748 | -- Selector name | |
3749 | ||
9b96e234 | 3750 | Typech : Entity_Id; |
996ae0b0 RK |
3751 | -- Type of first component in choice list |
3752 | ||
3753 | begin | |
3754 | if Present (Component_Associations (N)) then | |
3755 | Assoc := First (Component_Associations (N)); | |
3756 | else | |
3757 | Assoc := Empty; | |
3758 | end if; | |
3759 | ||
3760 | Verification : while Present (Assoc) loop | |
3761 | Selectr := First (Choices (Assoc)); | |
3762 | Typech := Empty; | |
3763 | ||
3764 | if Nkind (Selectr) = N_Others_Choice then | |
19f0526a | 3765 | |
9b96e234 | 3766 | -- Ada 2005 (AI-287): others choice may have expression or box |
19f0526a | 3767 | |
65356e64 | 3768 | if No (Others_Etype) |
9b96e234 | 3769 | and then not Others_Box |
65356e64 | 3770 | then |
ed2233dc | 3771 | Error_Msg_N |
996ae0b0 RK |
3772 | ("OTHERS must represent at least one component", Selectr); |
3773 | end if; | |
3774 | ||
3775 | exit Verification; | |
3776 | end if; | |
3777 | ||
3778 | while Present (Selectr) loop | |
3779 | New_Assoc := First (New_Assoc_List); | |
3780 | while Present (New_Assoc) loop | |
3781 | Component := First (Choices (New_Assoc)); | |
3782 | exit when Chars (Selectr) = Chars (Component); | |
3783 | Next (New_Assoc); | |
3784 | end loop; | |
3785 | ||
3786 | -- If no association, this is not a legal component of | |
aad93b55 ES |
3787 | -- of the type in question, except if its association |
3788 | -- is provided with a box. | |
996ae0b0 RK |
3789 | |
3790 | if No (New_Assoc) then | |
65356e64 | 3791 | if Box_Present (Parent (Selectr)) then |
aad93b55 ES |
3792 | |
3793 | -- This may still be a bogus component with a box. Scan | |
3794 | -- list of components to verify that a component with | |
3795 | -- that name exists. | |
3796 | ||
3797 | declare | |
3798 | C : Entity_Id; | |
3799 | ||
3800 | begin | |
3801 | C := First_Component (Typ); | |
3802 | while Present (C) loop | |
3803 | if Chars (C) = Chars (Selectr) then | |
ca44152f ES |
3804 | |
3805 | -- If the context is an extension aggregate, | |
3806 | -- the component must not be inherited from | |
3807 | -- the ancestor part of the aggregate. | |
3808 | ||
3809 | if Nkind (N) /= N_Extension_Aggregate | |
3810 | or else | |
3811 | Scope (Original_Record_Component (C)) /= | |
3812 | Etype (Ancestor_Part (N)) | |
3813 | then | |
3814 | exit; | |
3815 | end if; | |
aad93b55 ES |
3816 | end if; |
3817 | ||
3818 | Next_Component (C); | |
3819 | end loop; | |
3820 | ||
3821 | if No (C) then | |
3822 | Error_Msg_Node_2 := Typ; | |
3823 | Error_Msg_N ("& is not a component of}", Selectr); | |
3824 | end if; | |
3825 | end; | |
996ae0b0 | 3826 | |
65356e64 | 3827 | elsif Chars (Selectr) /= Name_uTag |
996ae0b0 RK |
3828 | and then Chars (Selectr) /= Name_uParent |
3829 | and then Chars (Selectr) /= Name_uController | |
3830 | then | |
3831 | if not Has_Discriminants (Typ) then | |
3832 | Error_Msg_Node_2 := Typ; | |
aad93b55 | 3833 | Error_Msg_N ("& is not a component of}", Selectr); |
996ae0b0 RK |
3834 | else |
3835 | Error_Msg_N | |
3836 | ("& is not a component of the aggregate subtype", | |
3837 | Selectr); | |
3838 | end if; | |
3839 | ||
3840 | Check_Misspelled_Component (Components, Selectr); | |
3841 | end if; | |
3842 | ||
3843 | elsif No (Typech) then | |
3844 | Typech := Base_Type (Etype (Component)); | |
3845 | ||
3846 | elsif Typech /= Base_Type (Etype (Component)) then | |
65356e64 AC |
3847 | if not Box_Present (Parent (Selectr)) then |
3848 | Error_Msg_N | |
3849 | ("components in choice list must have same type", | |
3850 | Selectr); | |
3851 | end if; | |
996ae0b0 RK |
3852 | end if; |
3853 | ||
3854 | Next (Selectr); | |
3855 | end loop; | |
3856 | ||
3857 | Next (Assoc); | |
3858 | end loop Verification; | |
3859 | end Step_7; | |
3860 | ||
3861 | -- STEP 8: replace the original aggregate | |
3862 | ||
3863 | Step_8 : declare | |
fbf5a39b | 3864 | New_Aggregate : constant Node_Id := New_Copy (N); |
996ae0b0 RK |
3865 | |
3866 | begin | |
3867 | Set_Expressions (New_Aggregate, No_List); | |
3868 | Set_Etype (New_Aggregate, Etype (N)); | |
3869 | Set_Component_Associations (New_Aggregate, New_Assoc_List); | |
3870 | ||
3871 | Rewrite (N, New_Aggregate); | |
3872 | end Step_8; | |
3873 | end Resolve_Record_Aggregate; | |
3874 | ||
2820d220 AC |
3875 | ----------------------------- |
3876 | -- Check_Can_Never_Be_Null -- | |
3877 | ----------------------------- | |
3878 | ||
9b96e234 | 3879 | procedure Check_Can_Never_Be_Null (Typ : Entity_Id; Expr : Node_Id) is |
ec53a6da JM |
3880 | Comp_Typ : Entity_Id; |
3881 | ||
2820d220 | 3882 | begin |
9b96e234 JM |
3883 | pragma Assert |
3884 | (Ada_Version >= Ada_05 | |
3885 | and then Present (Expr) | |
8133b9d1 | 3886 | and then Known_Null (Expr)); |
82c80734 | 3887 | |
ec53a6da JM |
3888 | case Ekind (Typ) is |
3889 | when E_Array_Type => | |
3890 | Comp_Typ := Component_Type (Typ); | |
3891 | ||
3892 | when E_Component | | |
3893 | E_Discriminant => | |
3894 | Comp_Typ := Etype (Typ); | |
3895 | ||
3896 | when others => | |
3897 | return; | |
3898 | end case; | |
3899 | ||
9b96e234 JM |
3900 | if Can_Never_Be_Null (Comp_Typ) then |
3901 | ||
3902 | -- Here we know we have a constraint error. Note that we do not use | |
3903 | -- Apply_Compile_Time_Constraint_Error here to the Expr, which might | |
3904 | -- seem the more natural approach. That's because in some cases the | |
3905 | -- components are rewritten, and the replacement would be missed. | |
3906 | ||
3907 | Insert_Action | |
3908 | (Compile_Time_Constraint_Error | |
3909 | (Expr, | |
8133b9d1 | 3910 | "(Ada 2005) null not allowed in null-excluding component?"), |
9b96e234 JM |
3911 | Make_Raise_Constraint_Error (Sloc (Expr), |
3912 | Reason => CE_Access_Check_Failed)); | |
3913 | ||
3914 | -- Set proper type for bogus component (why is this needed???) | |
3915 | ||
3916 | Set_Etype (Expr, Comp_Typ); | |
3917 | Set_Analyzed (Expr); | |
2820d220 AC |
3918 | end if; |
3919 | end Check_Can_Never_Be_Null; | |
3920 | ||
996ae0b0 RK |
3921 | --------------------- |
3922 | -- Sort_Case_Table -- | |
3923 | --------------------- | |
3924 | ||
3925 | procedure Sort_Case_Table (Case_Table : in out Case_Table_Type) is | |
fbf5a39b AC |
3926 | L : constant Int := Case_Table'First; |
3927 | U : constant Int := Case_Table'Last; | |
996ae0b0 RK |
3928 | K : Int; |
3929 | J : Int; | |
3930 | T : Case_Bounds; | |
3931 | ||
3932 | begin | |
3933 | K := L; | |
996ae0b0 RK |
3934 | while K /= U loop |
3935 | T := Case_Table (K + 1); | |
996ae0b0 | 3936 | |
7f9747c6 | 3937 | J := K + 1; |
996ae0b0 RK |
3938 | while J /= L |
3939 | and then Expr_Value (Case_Table (J - 1).Choice_Lo) > | |
3940 | Expr_Value (T.Choice_Lo) | |
3941 | loop | |
3942 | Case_Table (J) := Case_Table (J - 1); | |
3943 | J := J - 1; | |
3944 | end loop; | |
3945 | ||
3946 | Case_Table (J) := T; | |
3947 | K := K + 1; | |
3948 | end loop; | |
3949 | end Sort_Case_Table; | |
3950 | ||
3951 | end Sem_Aggr; |