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1 | ------------------------------------------------------------------------------ |
2 | -- -- | |
3 | -- GNAT COMPILER COMPONENTS -- | |
4 | -- -- | |
5 | -- S E M _ A T T R -- | |
6 | -- -- | |
7 | -- B o d y -- | |
8 | -- -- | |
6dc87f5f | 9 | -- Copyright (C) 1992-2016, 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- -- | |
b5c84c3c | 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 -- | |
b5c84c3c RD |
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 Ada.Characters.Latin_1; use Ada.Characters.Latin_1; | |
27 | ||
28 | with Atree; use Atree; | |
442ade9d | 29 | with Casing; use Casing; |
996ae0b0 | 30 | with Checks; use Checks; |
1f163ef7 | 31 | with Debug; use Debug; |
996ae0b0 | 32 | with Einfo; use Einfo; |
150ac76e | 33 | with Elists; use Elists; |
996ae0b0 RK |
34 | with Errout; use Errout; |
35 | with Eval_Fat; | |
468c6c8a | 36 | with Exp_Dist; use Exp_Dist; |
996ae0b0 RK |
37 | with Exp_Util; use Exp_Util; |
38 | with Expander; use Expander; | |
39 | with Freeze; use Freeze; | |
e0bf7d65 | 40 | with Gnatvsn; use Gnatvsn; |
e10dab7f | 41 | with Itypes; use Itypes; |
fbf5a39b | 42 | with Lib; use Lib; |
996ae0b0 | 43 | with Lib.Xref; use Lib.Xref; |
996ae0b0 RK |
44 | with Nlists; use Nlists; |
45 | with Nmake; use Nmake; | |
46 | with Opt; use Opt; | |
47 | with Restrict; use Restrict; | |
6e937c1c | 48 | with Rident; use Rident; |
996ae0b0 | 49 | with Rtsfind; use Rtsfind; |
fbf5a39b | 50 | with Sdefault; use Sdefault; |
996ae0b0 | 51 | with Sem; use Sem; |
a4100e55 | 52 | with Sem_Aux; use Sem_Aux; |
996ae0b0 RK |
53 | with Sem_Cat; use Sem_Cat; |
54 | with Sem_Ch6; use Sem_Ch6; | |
55 | with Sem_Ch8; use Sem_Ch8; | |
c0985d4e | 56 | with Sem_Ch10; use Sem_Ch10; |
dec6faf1 | 57 | with Sem_Dim; use Sem_Dim; |
996ae0b0 | 58 | with Sem_Dist; use Sem_Dist; |
1f163ef7 | 59 | with Sem_Elab; use Sem_Elab; |
16212e89 | 60 | with Sem_Elim; use Sem_Elim; |
996ae0b0 | 61 | with Sem_Eval; use Sem_Eval; |
c9d70ab1 | 62 | with Sem_Prag; use Sem_Prag; |
996ae0b0 RK |
63 | with Sem_Res; use Sem_Res; |
64 | with Sem_Type; use Sem_Type; | |
65 | with Sem_Util; use Sem_Util; | |
71140fc6 | 66 | with Sem_Warn; |
996ae0b0 RK |
67 | with Stand; use Stand; |
68 | with Sinfo; use Sinfo; | |
69 | with Sinput; use Sinput; | |
7ed57189 | 70 | with System; |
996ae0b0 | 71 | with Stringt; use Stringt; |
fea9e956 ES |
72 | with Style; |
73 | with Stylesw; use Stylesw; | |
996ae0b0 RK |
74 | with Targparm; use Targparm; |
75 | with Ttypes; use Ttypes; | |
996ae0b0 RK |
76 | with Tbuild; use Tbuild; |
77 | with Uintp; use Uintp; | |
2cbac6c6 | 78 | with Uname; use Uname; |
996ae0b0 | 79 | with Urealp; use Urealp; |
996ae0b0 RK |
80 | |
81 | package body Sem_Attr is | |
82 | ||
83 | True_Value : constant Uint := Uint_1; | |
84 | False_Value : constant Uint := Uint_0; | |
85 | -- Synonyms to be used when these constants are used as Boolean values | |
86 | ||
87 | Bad_Attribute : exception; | |
88 | -- Exception raised if an error is detected during attribute processing, | |
89 | -- used so that we can abandon the processing so we don't run into | |
90 | -- trouble with cascaded errors. | |
91 | ||
b8e6830b AC |
92 | -- The following array is the list of attributes defined in the Ada 83 RM. |
93 | -- In Ada 83 mode, these are the only recognized attributes. In other Ada | |
94 | -- modes all these attributes are recognized, even if removed in Ada 95. | |
996ae0b0 | 95 | |
fbf5a39b | 96 | Attribute_83 : constant Attribute_Class_Array := Attribute_Class_Array'( |
155562cb AC |
97 | Attribute_Address | |
98 | Attribute_Aft | | |
99 | Attribute_Alignment | | |
100 | Attribute_Base | | |
101 | Attribute_Callable | | |
102 | Attribute_Constrained | | |
103 | Attribute_Count | | |
104 | Attribute_Delta | | |
105 | Attribute_Digits | | |
106 | Attribute_Emax | | |
107 | Attribute_Epsilon | | |
108 | Attribute_First | | |
109 | Attribute_First_Bit | | |
110 | Attribute_Fore | | |
111 | Attribute_Image | | |
112 | Attribute_Large | | |
113 | Attribute_Last | | |
114 | Attribute_Last_Bit | | |
115 | Attribute_Leading_Part | | |
116 | Attribute_Length | | |
117 | Attribute_Machine_Emax | | |
118 | Attribute_Machine_Emin | | |
119 | Attribute_Machine_Mantissa | | |
120 | Attribute_Machine_Overflows | | |
121 | Attribute_Machine_Radix | | |
122 | Attribute_Machine_Rounds | | |
123 | Attribute_Mantissa | | |
124 | Attribute_Pos | | |
125 | Attribute_Position | | |
126 | Attribute_Pred | | |
127 | Attribute_Range | | |
128 | Attribute_Safe_Emax | | |
129 | Attribute_Safe_Large | | |
130 | Attribute_Safe_Small | | |
131 | Attribute_Size | | |
132 | Attribute_Small | | |
133 | Attribute_Storage_Size | | |
134 | Attribute_Succ | | |
135 | Attribute_Terminated | | |
136 | Attribute_Val | | |
137 | Attribute_Value | | |
138 | Attribute_Width => True, | |
139 | others => False); | |
996ae0b0 | 140 | |
822033eb HK |
141 | -- The following array is the list of attributes defined in the Ada 2005 |
142 | -- RM which are not defined in Ada 95. These are recognized in Ada 95 mode, | |
143 | -- but in Ada 95 they are considered to be implementation defined. | |
144 | ||
145 | Attribute_05 : constant Attribute_Class_Array := Attribute_Class_Array'( | |
155562cb AC |
146 | Attribute_Machine_Rounding | |
147 | Attribute_Mod | | |
148 | Attribute_Priority | | |
149 | Attribute_Stream_Size | | |
150 | Attribute_Wide_Wide_Width => True, | |
151 | others => False); | |
152 | ||
153 | -- The following array is the list of attributes defined in the Ada 2012 | |
154 | -- RM which are not defined in Ada 2005. These are recognized in Ada 95 | |
155 | -- and Ada 2005 modes, but are considered to be implementation defined. | |
156 | ||
157 | Attribute_12 : constant Attribute_Class_Array := Attribute_Class_Array'( | |
158 | Attribute_First_Valid | | |
159 | Attribute_Has_Same_Storage | | |
160 | Attribute_Last_Valid | | |
161 | Attribute_Max_Alignment_For_Allocation => True, | |
162 | others => False); | |
822033eb | 163 | |
442ade9d RD |
164 | -- The following array contains all attributes that imply a modification |
165 | -- of their prefixes or result in an access value. Such prefixes can be | |
166 | -- considered as lvalues. | |
822033eb | 167 | |
442ade9d | 168 | Attribute_Name_Implies_Lvalue_Prefix : constant Attribute_Class_Array := |
822033eb | 169 | Attribute_Class_Array'( |
155562cb AC |
170 | Attribute_Access | |
171 | Attribute_Address | | |
172 | Attribute_Input | | |
173 | Attribute_Read | | |
174 | Attribute_Unchecked_Access | | |
175 | Attribute_Unrestricted_Access => True, | |
176 | others => False); | |
822033eb | 177 | |
996ae0b0 RK |
178 | ----------------------- |
179 | -- Local_Subprograms -- | |
180 | ----------------------- | |
181 | ||
182 | procedure Eval_Attribute (N : Node_Id); | |
183 | -- Performs compile time evaluation of attributes where possible, leaving | |
184 | -- the Is_Static_Expression/Raises_Constraint_Error flags appropriately | |
185 | -- set, and replacing the node with a literal node if the value can be | |
186 | -- computed at compile time. All static attribute references are folded, | |
187 | -- as well as a number of cases of non-static attributes that can always | |
188 | -- be computed at compile time (e.g. floating-point model attributes that | |
189 | -- are applied to non-static subtypes). Of course in such cases, the | |
190 | -- Is_Static_Expression flag will not be set on the resulting literal. | |
191 | -- Note that the only required action of this procedure is to catch the | |
192 | -- static expression cases as described in the RM. Folding of other cases | |
193 | -- is done where convenient, but some additional non-static folding is in | |
97b9064f | 194 | -- Expand_N_Attribute_Reference in cases where this is more convenient. |
996ae0b0 RK |
195 | |
196 | function Is_Anonymous_Tagged_Base | |
197 | (Anon : Entity_Id; | |
155562cb | 198 | Typ : Entity_Id) return Boolean; |
996ae0b0 RK |
199 | -- For derived tagged types that constrain parent discriminants we build |
200 | -- an anonymous unconstrained base type. We need to recognize the relation | |
201 | -- between the two when analyzing an access attribute for a constrained | |
202 | -- component, before the full declaration for Typ has been analyzed, and | |
203 | -- where therefore the prefix of the attribute does not match the enclosing | |
204 | -- scope. | |
205 | ||
f7ea2603 RD |
206 | procedure Set_Boolean_Result (N : Node_Id; B : Boolean); |
207 | -- Rewrites node N with an occurrence of either Standard_False or | |
208 | -- Standard_True, depending on the value of the parameter B. The | |
209 | -- result is marked as a static expression. | |
210 | ||
996ae0b0 RK |
211 | ----------------------- |
212 | -- Analyze_Attribute -- | |
213 | ----------------------- | |
214 | ||
215 | procedure Analyze_Attribute (N : Node_Id) is | |
216 | Loc : constant Source_Ptr := Sloc (N); | |
217 | Aname : constant Name_Id := Attribute_Name (N); | |
218 | P : constant Node_Id := Prefix (N); | |
219 | Exprs : constant List_Id := Expressions (N); | |
220 | Attr_Id : constant Attribute_Id := Get_Attribute_Id (Aname); | |
221 | E1 : Node_Id; | |
222 | E2 : Node_Id; | |
223 | ||
224 | P_Type : Entity_Id; | |
225 | -- Type of prefix after analysis | |
226 | ||
227 | P_Base_Type : Entity_Id; | |
228 | -- Base type of prefix after analysis | |
229 | ||
996ae0b0 RK |
230 | ----------------------- |
231 | -- Local Subprograms -- | |
232 | ----------------------- | |
233 | ||
3cd4a210 AC |
234 | procedure Address_Checks; |
235 | -- Semantic checks for valid use of Address attribute. This was made | |
236 | -- a separate routine with the idea of using it for unrestricted access | |
237 | -- which seems like it should follow the same rules, but that turned | |
238 | -- out to be impractical. So now this is only used for Address. | |
239 | ||
fbf5a39b | 240 | procedure Analyze_Access_Attribute; |
996ae0b0 RK |
241 | -- Used for Access, Unchecked_Access, Unrestricted_Access attributes. |
242 | -- Internally, Id distinguishes which of the three cases is involved. | |
243 | ||
b6a56408 AC |
244 | procedure Analyze_Attribute_Old_Result |
245 | (Legal : out Boolean; | |
246 | Spec_Id : out Entity_Id); | |
247 | -- Common processing for attributes 'Old and 'Result. The routine checks | |
248 | -- that the attribute appears in a postcondition-like aspect or pragma | |
249 | -- associated with a suitable subprogram or a body. Flag Legal is set | |
488f9623 | 250 | -- when the above criteria are met. Spec_Id denotes the entity of the |
b6a56408 AC |
251 | -- subprogram [body] or Empty if the attribute is illegal. |
252 | ||
26df19ce AC |
253 | procedure Bad_Attribute_For_Predicate; |
254 | -- Output error message for use of a predicate (First, Last, Range) not | |
255 | -- allowed with a type that has predicates. If the type is a generic | |
256 | -- actual, then the message is a warning, and we generate code to raise | |
86200f66 | 257 | -- program error with an appropriate reason. No error message is given |
011f9d5d AC |
258 | -- for internally generated uses of the attributes. This legality rule |
259 | -- only applies to scalar types. | |
260 | ||
996ae0b0 RK |
261 | procedure Check_Array_Or_Scalar_Type; |
262 | -- Common procedure used by First, Last, Range attribute to check | |
263 | -- that the prefix is a constrained array or scalar type, or a name | |
264 | -- of an array object, and that an argument appears only if appropriate | |
265 | -- (i.e. only in the array case). | |
266 | ||
267 | procedure Check_Array_Type; | |
268 | -- Common semantic checks for all array attributes. Checks that the | |
269 | -- prefix is a constrained array type or the name of an array object. | |
270 | -- The error message for non-arrays is specialized appropriately. | |
271 | ||
272 | procedure Check_Asm_Attribute; | |
273 | -- Common semantic checks for Asm_Input and Asm_Output attributes | |
274 | ||
275 | procedure Check_Component; | |
276 | -- Common processing for Bit_Position, First_Bit, Last_Bit, and | |
277 | -- Position. Checks prefix is an appropriate selected component. | |
278 | ||
279 | procedure Check_Decimal_Fixed_Point_Type; | |
280 | -- Check that prefix of attribute N is a decimal fixed-point type | |
281 | ||
282 | procedure Check_Dereference; | |
283 | -- If the prefix of attribute is an object of an access type, then | |
09494c32 | 284 | -- introduce an explicit dereference, and adjust P_Type accordingly. |
996ae0b0 RK |
285 | |
286 | procedure Check_Discrete_Type; | |
287 | -- Verify that prefix of attribute N is a discrete type | |
288 | ||
289 | procedure Check_E0; | |
290 | -- Check that no attribute arguments are present | |
291 | ||
292 | procedure Check_Either_E0_Or_E1; | |
293 | -- Check that there are zero or one attribute arguments present | |
294 | ||
295 | procedure Check_E1; | |
296 | -- Check that exactly one attribute argument is present | |
297 | ||
298 | procedure Check_E2; | |
299 | -- Check that two attribute arguments are present | |
300 | ||
301 | procedure Check_Enum_Image; | |
4199e8c6 RD |
302 | -- If the prefix type of 'Image is an enumeration type, set all its |
303 | -- literals as referenced, since the image function could possibly end | |
304 | -- up referencing any of the literals indirectly. Same for Enum_Val. | |
8097203f AC |
305 | -- Set the flag only if the reference is in the main code unit. Same |
306 | -- restriction when resolving 'Value; otherwise an improperly set | |
4199e8c6 RD |
307 | -- reference when analyzing an inlined body will lose a proper |
308 | -- warning on a useless with_clause. | |
996ae0b0 | 309 | |
011f9d5d AC |
310 | procedure Check_First_Last_Valid; |
311 | -- Perform all checks for First_Valid and Last_Valid attributes | |
312 | ||
996ae0b0 RK |
313 | procedure Check_Fixed_Point_Type; |
314 | -- Verify that prefix of attribute N is a fixed type | |
315 | ||
316 | procedure Check_Fixed_Point_Type_0; | |
317 | -- Verify that prefix of attribute N is a fixed type and that | |
318 | -- no attribute expressions are present | |
319 | ||
320 | procedure Check_Floating_Point_Type; | |
321 | -- Verify that prefix of attribute N is a float type | |
322 | ||
323 | procedure Check_Floating_Point_Type_0; | |
324 | -- Verify that prefix of attribute N is a float type and that | |
325 | -- no attribute expressions are present | |
326 | ||
327 | procedure Check_Floating_Point_Type_1; | |
328 | -- Verify that prefix of attribute N is a float type and that | |
329 | -- exactly one attribute expression is present | |
330 | ||
331 | procedure Check_Floating_Point_Type_2; | |
332 | -- Verify that prefix of attribute N is a float type and that | |
333 | -- two attribute expressions are present | |
334 | ||
ce5ba43a | 335 | procedure Check_SPARK_05_Restriction_On_Attribute; |
7a489a2b AC |
336 | -- Issue an error in formal mode because attribute N is allowed |
337 | ||
996ae0b0 RK |
338 | procedure Check_Integer_Type; |
339 | -- Verify that prefix of attribute N is an integer type | |
340 | ||
5f3ab6fb AC |
341 | procedure Check_Modular_Integer_Type; |
342 | -- Verify that prefix of attribute N is a modular integer type | |
343 | ||
21d27997 RD |
344 | procedure Check_Not_CPP_Type; |
345 | -- Check that P (the prefix of the attribute) is not an CPP type | |
346 | -- for which no Ada predefined primitive is available. | |
347 | ||
996ae0b0 RK |
348 | procedure Check_Not_Incomplete_Type; |
349 | -- Check that P (the prefix of the attribute) is not an incomplete | |
350 | -- type or a private type for which no full view has been given. | |
351 | ||
352 | procedure Check_Object_Reference (P : Node_Id); | |
99fc068e | 353 | -- Check that P is an object reference |
996ae0b0 | 354 | |
b6a56408 AC |
355 | procedure Check_PolyORB_Attribute; |
356 | -- Validity checking for PolyORB/DSA attribute | |
357 | ||
996ae0b0 RK |
358 | procedure Check_Program_Unit; |
359 | -- Verify that prefix of attribute N is a program unit | |
360 | ||
361 | procedure Check_Real_Type; | |
362 | -- Verify that prefix of attribute N is fixed or float type | |
363 | ||
364 | procedure Check_Scalar_Type; | |
365 | -- Verify that prefix of attribute N is a scalar type | |
366 | ||
367 | procedure Check_Standard_Prefix; | |
f7ea2603 RD |
368 | -- Verify that prefix of attribute N is package Standard. Also checks |
369 | -- that there are no arguments. | |
996ae0b0 | 370 | |
fbf5a39b AC |
371 | procedure Check_Stream_Attribute (Nam : TSS_Name_Type); |
372 | -- Validity checking for stream attribute. Nam is the TSS name of the | |
996ae0b0 | 373 | -- corresponding possible defined attribute function (e.g. for the |
fbf5a39b | 374 | -- Read attribute, Nam will be TSS_Stream_Read). |
996ae0b0 | 375 | |
f7ea2603 RD |
376 | procedure Check_System_Prefix; |
377 | -- Verify that prefix of attribute N is package System | |
378 | ||
996ae0b0 RK |
379 | procedure Check_Task_Prefix; |
380 | -- Verify that prefix of attribute N is a task or task type | |
381 | ||
382 | procedure Check_Type; | |
383 | -- Verify that the prefix of attribute N is a type | |
384 | ||
385 | procedure Check_Unit_Name (Nod : Node_Id); | |
386 | -- Check that Nod is of the form of a library unit name, i.e that | |
387 | -- it is an identifier, or a selected component whose prefix is | |
388 | -- itself of the form of a library unit name. Note that this is | |
389 | -- quite different from Check_Program_Unit, since it only checks | |
390 | -- the syntactic form of the name, not the semantic identity. This | |
a015ef67 AC |
391 | -- is because it is used with attributes (Elab_Body, Elab_Spec and |
392 | -- Elaborated) which can refer to non-visible unit. | |
996ae0b0 RK |
393 | |
394 | procedure Error_Attr (Msg : String; Error_Node : Node_Id); | |
395 | pragma No_Return (Error_Attr); | |
fbf5a39b AC |
396 | procedure Error_Attr; |
397 | pragma No_Return (Error_Attr); | |
996ae0b0 RK |
398 | -- Posts error using Error_Msg_N at given node, sets type of attribute |
399 | -- node to Any_Type, and then raises Bad_Attribute to avoid any further | |
400 | -- semantic processing. The message typically contains a % insertion | |
fbf5a39b AC |
401 | -- character which is replaced by the attribute name. The call with |
402 | -- no arguments is used when the caller has already generated the | |
403 | -- required error messages. | |
996ae0b0 | 404 | |
822033eb HK |
405 | procedure Error_Attr_P (Msg : String); |
406 | pragma No_Return (Error_Attr); | |
407 | -- Like Error_Attr, but error is posted at the start of the prefix | |
408 | ||
e7f23f06 AC |
409 | procedure Legal_Formal_Attribute; |
410 | -- Common processing for attributes Definite and Has_Discriminants. | |
411 | -- Checks that prefix is generic indefinite formal type. | |
412 | ||
85d6bf87 AC |
413 | procedure Max_Alignment_For_Allocation_Max_Size_In_Storage_Elements; |
414 | -- Common processing for attributes Max_Alignment_For_Allocation and | |
415 | -- Max_Size_In_Storage_Elements. | |
416 | ||
417 | procedure Min_Max; | |
418 | -- Common processing for attributes Max and Min | |
419 | ||
996ae0b0 RK |
420 | procedure Standard_Attribute (Val : Int); |
421 | -- Used to process attributes whose prefix is package Standard which | |
422 | -- yield values of type Universal_Integer. The attribute reference | |
edab6088 RD |
423 | -- node is rewritten with an integer literal of the given value which |
424 | -- is marked as static. | |
996ae0b0 | 425 | |
96e90ac1 RD |
426 | procedure Uneval_Old_Msg; |
427 | -- Called when Loop_Entry or Old is used in a potentially unevaluated | |
428 | -- expression. Generates appropriate message or warning depending on | |
1773d80b AC |
429 | -- the setting of Opt.Uneval_Old (or flags in an N_Aspect_Specification |
430 | -- node in the aspect case). | |
96e90ac1 | 431 | |
996ae0b0 RK |
432 | procedure Unexpected_Argument (En : Node_Id); |
433 | -- Signal unexpected attribute argument (En is the argument) | |
434 | ||
435 | procedure Validate_Non_Static_Attribute_Function_Call; | |
436 | -- Called when processing an attribute that is a function call to a | |
437 | -- non-static function, i.e. an attribute function that either takes | |
438 | -- non-scalar arguments or returns a non-scalar result. Verifies that | |
439 | -- such a call does not appear in a preelaborable context. | |
440 | ||
3cd4a210 AC |
441 | -------------------- |
442 | -- Address_Checks -- | |
443 | -------------------- | |
444 | ||
445 | procedure Address_Checks is | |
446 | begin | |
447 | -- An Address attribute created by expansion is legal even when it | |
448 | -- applies to other entity-denoting expressions. | |
449 | ||
450 | if not Comes_From_Source (N) then | |
451 | return; | |
452 | ||
453 | -- Address attribute on a protected object self reference is legal | |
454 | ||
455 | elsif Is_Protected_Self_Reference (P) then | |
456 | return; | |
457 | ||
458 | -- Address applied to an entity | |
459 | ||
460 | elsif Is_Entity_Name (P) then | |
461 | declare | |
462 | Ent : constant Entity_Id := Entity (P); | |
463 | ||
464 | begin | |
465 | if Is_Subprogram (Ent) then | |
466 | Set_Address_Taken (Ent); | |
467 | Kill_Current_Values (Ent); | |
468 | ||
469 | -- An Address attribute is accepted when generated by the | |
470 | -- compiler for dispatching operation, and an error is | |
471 | -- issued once the subprogram is frozen (to avoid confusing | |
472 | -- errors about implicit uses of Address in the dispatch | |
473 | -- table initialization). | |
474 | ||
475 | if Has_Pragma_Inline_Always (Entity (P)) | |
476 | and then Comes_From_Source (P) | |
477 | then | |
478 | Error_Attr_P | |
479 | ("prefix of % attribute cannot be Inline_Always " | |
480 | & "subprogram"); | |
481 | ||
482 | -- It is illegal to apply 'Address to an intrinsic | |
483 | -- subprogram. This is now formalized in AI05-0095. | |
484 | -- In an instance, an attempt to obtain 'Address of an | |
485 | -- intrinsic subprogram (e.g the renaming of a predefined | |
486 | -- operator that is an actual) raises Program_Error. | |
487 | ||
488 | elsif Convention (Ent) = Convention_Intrinsic then | |
489 | if In_Instance then | |
490 | Rewrite (N, | |
491 | Make_Raise_Program_Error (Loc, | |
492 | Reason => PE_Address_Of_Intrinsic)); | |
493 | ||
494 | else | |
82893775 | 495 | Error_Msg_Name_1 := Aname; |
3cd4a210 AC |
496 | Error_Msg_N |
497 | ("cannot take % of intrinsic subprogram", N); | |
498 | end if; | |
499 | ||
500 | -- Issue an error if prefix denotes an eliminated subprogram | |
501 | ||
502 | else | |
503 | Check_For_Eliminated_Subprogram (P, Ent); | |
504 | end if; | |
505 | ||
506 | -- Object or label reference | |
507 | ||
508 | elsif Is_Object (Ent) or else Ekind (Ent) = E_Label then | |
509 | Set_Address_Taken (Ent); | |
510 | ||
511 | -- Deal with No_Implicit_Aliasing restriction | |
512 | ||
513 | if Restriction_Check_Required (No_Implicit_Aliasing) then | |
514 | if not Is_Aliased_View (P) then | |
515 | Check_Restriction (No_Implicit_Aliasing, P); | |
516 | else | |
517 | Check_No_Implicit_Aliasing (P); | |
518 | end if; | |
519 | end if; | |
520 | ||
521 | -- If we have an address of an object, and the attribute | |
522 | -- comes from source, then set the object as potentially | |
523 | -- source modified. We do this because the resulting address | |
524 | -- can potentially be used to modify the variable and we | |
525 | -- might not detect this, leading to some junk warnings. | |
526 | ||
527 | Set_Never_Set_In_Source (Ent, False); | |
528 | ||
529 | -- Allow Address to be applied to task or protected type, | |
530 | -- returning null address (what is that about???) | |
531 | ||
532 | elsif (Is_Concurrent_Type (Etype (Ent)) | |
533 | and then Etype (Ent) = Base_Type (Ent)) | |
534 | or else Ekind (Ent) = E_Package | |
535 | or else Is_Generic_Unit (Ent) | |
536 | then | |
537 | Rewrite (N, | |
538 | New_Occurrence_Of (RTE (RE_Null_Address), Sloc (N))); | |
539 | ||
540 | -- Anything else is illegal | |
541 | ||
542 | else | |
543 | Error_Attr ("invalid prefix for % attribute", P); | |
544 | end if; | |
545 | end; | |
546 | ||
3cd4a210 AC |
547 | -- Object is OK |
548 | ||
549 | elsif Is_Object_Reference (P) then | |
550 | return; | |
551 | ||
552 | -- Subprogram called using dot notation | |
553 | ||
554 | elsif Nkind (P) = N_Selected_Component | |
555 | and then Is_Subprogram (Entity (Selector_Name (P))) | |
556 | then | |
557 | return; | |
558 | ||
559 | -- What exactly are we allowing here ??? and is this properly | |
560 | -- documented in the sinfo documentation for this node ??? | |
561 | ||
562 | elsif Relaxed_RM_Semantics | |
563 | and then Nkind (P) = N_Attribute_Reference | |
564 | then | |
565 | return; | |
566 | ||
567 | -- All other non-entity name cases are illegal | |
568 | ||
569 | else | |
570 | Error_Attr ("invalid prefix for % attribute", P); | |
571 | end if; | |
572 | end Address_Checks; | |
573 | ||
fbf5a39b AC |
574 | ------------------------------ |
575 | -- Analyze_Access_Attribute -- | |
576 | ------------------------------ | |
996ae0b0 | 577 | |
fbf5a39b | 578 | procedure Analyze_Access_Attribute is |
996ae0b0 RK |
579 | Acc_Type : Entity_Id; |
580 | ||
581 | Scop : Entity_Id; | |
582 | Typ : Entity_Id; | |
583 | ||
584 | function Build_Access_Object_Type (DT : Entity_Id) return Entity_Id; | |
585 | -- Build an access-to-object type whose designated type is DT, | |
586 | -- and whose Ekind is appropriate to the attribute type. The | |
587 | -- type that is constructed is returned as the result. | |
588 | ||
589 | procedure Build_Access_Subprogram_Type (P : Node_Id); | |
21d27997 RD |
590 | -- Build an access to subprogram whose designated type is the type of |
591 | -- the prefix. If prefix is overloaded, so is the node itself. The | |
592 | -- result is stored in Acc_Type. | |
996ae0b0 | 593 | |
468c6c8a ES |
594 | function OK_Self_Reference return Boolean; |
595 | -- An access reference whose prefix is a type can legally appear | |
596 | -- within an aggregate, where it is obtained by expansion of | |
822033eb HK |
597 | -- a defaulted aggregate. The enclosing aggregate that contains |
598 | -- the self-referenced is flagged so that the self-reference can | |
599 | -- be expanded into a reference to the target object (see exp_aggr). | |
468c6c8a | 600 | |
996ae0b0 RK |
601 | ------------------------------ |
602 | -- Build_Access_Object_Type -- | |
603 | ------------------------------ | |
604 | ||
605 | function Build_Access_Object_Type (DT : Entity_Id) return Entity_Id is | |
fea9e956 ES |
606 | Typ : constant Entity_Id := |
607 | New_Internal_Entity | |
608 | (E_Access_Attribute_Type, Current_Scope, Loc, 'A'); | |
996ae0b0 | 609 | begin |
996ae0b0 | 610 | Set_Etype (Typ, Typ); |
996ae0b0 RK |
611 | Set_Is_Itype (Typ); |
612 | Set_Associated_Node_For_Itype (Typ, N); | |
613 | Set_Directly_Designated_Type (Typ, DT); | |
614 | return Typ; | |
615 | end Build_Access_Object_Type; | |
616 | ||
617 | ---------------------------------- | |
618 | -- Build_Access_Subprogram_Type -- | |
619 | ---------------------------------- | |
620 | ||
621 | procedure Build_Access_Subprogram_Type (P : Node_Id) is | |
12e0c41c AC |
622 | Index : Interp_Index; |
623 | It : Interp; | |
996ae0b0 | 624 | |
822033eb HK |
625 | procedure Check_Local_Access (E : Entity_Id); |
626 | -- Deal with possible access to local subprogram. If we have such | |
627 | -- an access, we set a flag to kill all tracked values on any call | |
628 | -- because this access value may be passed around, and any called | |
629 | -- code might use it to access a local procedure which clobbers a | |
70b70ce8 AC |
630 | -- tracked value. If the scope is a loop or block, indicate that |
631 | -- value tracking is disabled for the enclosing subprogram. | |
822033eb | 632 | |
996ae0b0 | 633 | function Get_Kind (E : Entity_Id) return Entity_Kind; |
edd63e9b | 634 | -- Distinguish between access to regular/protected subprograms |
996ae0b0 | 635 | |
822033eb HK |
636 | ------------------------ |
637 | -- Check_Local_Access -- | |
638 | ------------------------ | |
639 | ||
640 | procedure Check_Local_Access (E : Entity_Id) is | |
641 | begin | |
642 | if not Is_Library_Level_Entity (E) then | |
643 | Set_Suppress_Value_Tracking_On_Call (Current_Scope); | |
70b70ce8 AC |
644 | Set_Suppress_Value_Tracking_On_Call |
645 | (Nearest_Dynamic_Scope (Current_Scope)); | |
822033eb HK |
646 | end if; |
647 | end Check_Local_Access; | |
648 | ||
fbf5a39b AC |
649 | -------------- |
650 | -- Get_Kind -- | |
651 | -------------- | |
652 | ||
996ae0b0 RK |
653 | function Get_Kind (E : Entity_Id) return Entity_Kind is |
654 | begin | |
655 | if Convention (E) = Convention_Protected then | |
656 | return E_Access_Protected_Subprogram_Type; | |
657 | else | |
658 | return E_Access_Subprogram_Type; | |
659 | end if; | |
660 | end Get_Kind; | |
661 | ||
662 | -- Start of processing for Build_Access_Subprogram_Type | |
663 | ||
664 | begin | |
12e0c41c AC |
665 | -- In the case of an access to subprogram, use the name of the |
666 | -- subprogram itself as the designated type. Type-checking in | |
667 | -- this case compares the signatures of the designated types. | |
668 | ||
e10dab7f JM |
669 | -- Note: This fragment of the tree is temporarily malformed |
670 | -- because the correct tree requires an E_Subprogram_Type entity | |
671 | -- as the designated type. In most cases this designated type is | |
12a13f01 | 672 | -- later overridden by the semantics with the type imposed by the |
e10dab7f JM |
673 | -- context during the resolution phase. In the specific case of |
674 | -- the expression Address!(Prim'Unrestricted_Access), used to | |
675 | -- initialize slots of dispatch tables, this work will be done by | |
676 | -- the expander (see Exp_Aggr). | |
677 | ||
678 | -- The reason to temporarily add this kind of node to the tree | |
679 | -- instead of a proper E_Subprogram_Type itype, is the following: | |
680 | -- in case of errors found in the source file we report better | |
681 | -- error messages. For example, instead of generating the | |
682 | -- following error: | |
683 | ||
684 | -- "expected access to subprogram with profile | |
685 | -- defined at line X" | |
686 | ||
687 | -- we currently generate: | |
688 | ||
689 | -- "expected access to function Z defined at line X" | |
690 | ||
edd63e9b ES |
691 | Set_Etype (N, Any_Type); |
692 | ||
996ae0b0 | 693 | if not Is_Overloaded (P) then |
822033eb HK |
694 | Check_Local_Access (Entity (P)); |
695 | ||
edd63e9b | 696 | if not Is_Intrinsic_Subprogram (Entity (P)) then |
e10dab7f JM |
697 | Acc_Type := Create_Itype (Get_Kind (Entity (P)), N); |
698 | Set_Is_Public (Acc_Type, False); | |
edd63e9b | 699 | Set_Etype (Acc_Type, Acc_Type); |
e10dab7f | 700 | Set_Convention (Acc_Type, Convention (Entity (P))); |
edd63e9b ES |
701 | Set_Directly_Designated_Type (Acc_Type, Entity (P)); |
702 | Set_Etype (N, Acc_Type); | |
e10dab7f | 703 | Freeze_Before (N, Acc_Type); |
edd63e9b | 704 | end if; |
996ae0b0 RK |
705 | |
706 | else | |
707 | Get_First_Interp (P, Index, It); | |
996ae0b0 | 708 | while Present (It.Nam) loop |
822033eb HK |
709 | Check_Local_Access (It.Nam); |
710 | ||
996ae0b0 | 711 | if not Is_Intrinsic_Subprogram (It.Nam) then |
e10dab7f JM |
712 | Acc_Type := Create_Itype (Get_Kind (It.Nam), N); |
713 | Set_Is_Public (Acc_Type, False); | |
996ae0b0 | 714 | Set_Etype (Acc_Type, Acc_Type); |
e10dab7f | 715 | Set_Convention (Acc_Type, Convention (It.Nam)); |
996ae0b0 RK |
716 | Set_Directly_Designated_Type (Acc_Type, It.Nam); |
717 | Add_One_Interp (N, Acc_Type, Acc_Type); | |
e10dab7f | 718 | Freeze_Before (N, Acc_Type); |
996ae0b0 RK |
719 | end if; |
720 | ||
721 | Get_Next_Interp (Index, It); | |
722 | end loop; | |
edd63e9b | 723 | end if; |
996ae0b0 | 724 | |
822033eb HK |
725 | -- Cannot be applied to intrinsic. Looking at the tests above, |
726 | -- the only way Etype (N) can still be set to Any_Type is if | |
727 | -- Is_Intrinsic_Subprogram was True for some referenced entity. | |
728 | ||
edd63e9b | 729 | if Etype (N) = Any_Type then |
822033eb | 730 | Error_Attr_P ("prefix of % attribute cannot be intrinsic"); |
996ae0b0 RK |
731 | end if; |
732 | end Build_Access_Subprogram_Type; | |
733 | ||
468c6c8a ES |
734 | ---------------------- |
735 | -- OK_Self_Reference -- | |
736 | ---------------------- | |
737 | ||
738 | function OK_Self_Reference return Boolean is | |
739 | Par : Node_Id; | |
740 | ||
741 | begin | |
742 | Par := Parent (N); | |
743 | while Present (Par) | |
822033eb HK |
744 | and then |
745 | (Nkind (Par) = N_Component_Association | |
746 | or else Nkind (Par) in N_Subexpr) | |
468c6c8a | 747 | loop |
e10dab7f | 748 | if Nkind_In (Par, N_Aggregate, N_Extension_Aggregate) then |
822033eb HK |
749 | if Etype (Par) = Typ then |
750 | Set_Has_Self_Reference (Par); | |
b35e5dcb AC |
751 | |
752 | -- Check the context: the aggregate must be part of the | |
753 | -- initialization of a type or component, or it is the | |
754 | -- resulting expansion in an initialization procedure. | |
755 | ||
756 | if Is_Init_Proc (Current_Scope) then | |
757 | return True; | |
758 | else | |
759 | Par := Parent (Par); | |
760 | while Present (Par) loop | |
761 | if Nkind (Par) = N_Full_Type_Declaration then | |
762 | return True; | |
763 | end if; | |
764 | ||
765 | Par := Parent (Par); | |
766 | end loop; | |
767 | end if; | |
768 | ||
769 | return False; | |
822033eb HK |
770 | end if; |
771 | end if; | |
772 | ||
468c6c8a ES |
773 | Par := Parent (Par); |
774 | end loop; | |
775 | ||
822033eb HK |
776 | -- No enclosing aggregate, or not a self-reference |
777 | ||
778 | return False; | |
468c6c8a ES |
779 | end OK_Self_Reference; |
780 | ||
fbf5a39b | 781 | -- Start of processing for Analyze_Access_Attribute |
996ae0b0 RK |
782 | |
783 | begin | |
ce5ba43a | 784 | Check_SPARK_05_Restriction_On_Attribute; |
996ae0b0 RK |
785 | Check_E0; |
786 | ||
787 | if Nkind (P) = N_Character_Literal then | |
822033eb HK |
788 | Error_Attr_P |
789 | ("prefix of % attribute cannot be enumeration literal"); | |
fbf5a39b | 790 | end if; |
996ae0b0 | 791 | |
12e0c41c | 792 | -- Case of access to subprogram |
996ae0b0 | 793 | |
b07b7ace | 794 | if Is_Entity_Name (P) and then Is_Overloadable (Entity (P)) then |
7b76e805 | 795 | if Has_Pragma_Inline_Always (Entity (P)) then |
822033eb HK |
796 | Error_Attr_P |
797 | ("prefix of % attribute cannot be Inline_Always subprogram"); | |
edd63e9b | 798 | |
a7e68e7f | 799 | elsif Aname = Name_Unchecked_Access then |
468c6c8a ES |
800 | Error_Attr ("attribute% cannot be applied to a subprogram", P); |
801 | end if; | |
802 | ||
16212e89 GD |
803 | -- Issue an error if the prefix denotes an eliminated subprogram |
804 | ||
805 | Check_For_Eliminated_Subprogram (P, Entity (P)); | |
806 | ||
b5c739f9 RD |
807 | -- Check for obsolescent subprogram reference |
808 | ||
809 | Check_Obsolescent_2005_Entity (Entity (P), P); | |
810 | ||
12e0c41c AC |
811 | -- Build the appropriate subprogram type |
812 | ||
996ae0b0 | 813 | Build_Access_Subprogram_Type (P); |
fbf5a39b | 814 | |
6b81741c AC |
815 | -- For P'Access or P'Unrestricted_Access, where P is a nested |
816 | -- subprogram, we might be passing P to another subprogram (but we | |
817 | -- don't check that here), which might call P. P could modify | |
818 | -- local variables, so we need to kill current values. It is | |
819 | -- important not to do this for library-level subprograms, because | |
820 | -- Kill_Current_Values is very inefficient in the case of library | |
821 | -- level packages with lots of tagged types. | |
822 | ||
823 | if Is_Library_Level_Entity (Entity (Prefix (N))) then | |
824 | null; | |
825 | ||
826 | -- Do not kill values on nodes initializing dispatch tables | |
827 | -- slots. The construct Prim_Ptr!(Prim'Unrestricted_Access) | |
828 | -- is currently generated by the expander only for this | |
829 | -- purpose. Done to keep the quality of warnings currently | |
830 | -- generated by the compiler (otherwise any declaration of | |
831 | -- a tagged type cleans constant indications from its scope). | |
832 | ||
833 | elsif Nkind (Parent (N)) = N_Unchecked_Type_Conversion | |
834 | and then (Etype (Parent (N)) = RTE (RE_Prim_Ptr) | |
835 | or else | |
836 | Etype (Parent (N)) = RTE (RE_Size_Ptr)) | |
837 | and then Is_Dispatching_Operation | |
838 | (Directly_Designated_Type (Etype (N))) | |
839 | then | |
840 | null; | |
841 | ||
842 | else | |
843 | Kill_Current_Values; | |
fbf5a39b AC |
844 | end if; |
845 | ||
97b9064f BD |
846 | -- In the static elaboration model, treat the attribute reference |
847 | -- as a call for elaboration purposes. Suppress this treatment | |
848 | -- under debug flag. In any case, we are all done. | |
1f163ef7 | 849 | |
97b9064f | 850 | if not Dynamic_Elaboration_Checks and not Debug_Flag_Dot_UU then |
1f163ef7 AC |
851 | Check_Elab_Call (N); |
852 | end if; | |
853 | ||
996ae0b0 RK |
854 | return; |
855 | ||
12e0c41c | 856 | -- Component is an operation of a protected type |
996ae0b0 | 857 | |
fbf5a39b AC |
858 | elsif Nkind (P) = N_Selected_Component |
859 | and then Is_Overloadable (Entity (Selector_Name (P))) | |
996ae0b0 RK |
860 | then |
861 | if Ekind (Entity (Selector_Name (P))) = E_Entry then | |
822033eb | 862 | Error_Attr_P ("prefix of % attribute must be subprogram"); |
996ae0b0 RK |
863 | end if; |
864 | ||
865 | Build_Access_Subprogram_Type (Selector_Name (P)); | |
866 | return; | |
867 | end if; | |
868 | ||
869 | -- Deal with incorrect reference to a type, but note that some | |
468c6c8a ES |
870 | -- accesses are allowed: references to the current type instance, |
871 | -- or in Ada 2005 self-referential pointer in a default-initialized | |
872 | -- aggregate. | |
996ae0b0 RK |
873 | |
874 | if Is_Entity_Name (P) then | |
996ae0b0 RK |
875 | Typ := Entity (P); |
876 | ||
65f01153 RD |
877 | -- The reference may appear in an aggregate that has been expanded |
878 | -- into a loop. Locate scope of type definition, if any. | |
879 | ||
880 | Scop := Current_Scope; | |
881 | while Ekind (Scop) = E_Loop loop | |
882 | Scop := Scope (Scop); | |
883 | end loop; | |
884 | ||
996ae0b0 RK |
885 | if Is_Type (Typ) then |
886 | ||
887 | -- OK if we are within the scope of a limited type | |
888 | -- let's mark the component as having per object constraint | |
889 | ||
890 | if Is_Anonymous_Tagged_Base (Scop, Typ) then | |
891 | Typ := Scop; | |
892 | Set_Entity (P, Typ); | |
893 | Set_Etype (P, Typ); | |
894 | end if; | |
895 | ||
896 | if Typ = Scop then | |
897 | declare | |
898 | Q : Node_Id := Parent (N); | |
899 | ||
900 | begin | |
901 | while Present (Q) | |
902 | and then Nkind (Q) /= N_Component_Declaration | |
903 | loop | |
904 | Q := Parent (Q); | |
905 | end loop; | |
65f01153 | 906 | |
996ae0b0 | 907 | if Present (Q) then |
b87971f3 AC |
908 | Set_Has_Per_Object_Constraint |
909 | (Defining_Identifier (Q), True); | |
996ae0b0 RK |
910 | end if; |
911 | end; | |
912 | ||
913 | if Nkind (P) = N_Expanded_Name then | |
822033eb | 914 | Error_Msg_F |
996ae0b0 RK |
915 | ("current instance prefix must be a direct name", P); |
916 | end if; | |
917 | ||
21d27997 RD |
918 | -- If a current instance attribute appears in a component |
919 | -- constraint it must appear alone; other contexts (spec- | |
920 | -- expressions, within a task body) are not subject to this | |
921 | -- restriction. | |
996ae0b0 | 922 | |
21d27997 | 923 | if not In_Spec_Expression |
996ae0b0 | 924 | and then not Has_Completion (Scop) |
e10dab7f JM |
925 | and then not |
926 | Nkind_In (Parent (N), N_Discriminant_Association, | |
927 | N_Index_Or_Discriminant_Constraint) | |
996ae0b0 RK |
928 | then |
929 | Error_Msg_N | |
930 | ("current instance attribute must appear alone", N); | |
931 | end if; | |
cefce34c JM |
932 | |
933 | if Is_CPP_Class (Root_Type (Typ)) then | |
934 | Error_Msg_N | |
324ac540 | 935 | ("??current instance unsupported for derivations of " |
cefce34c JM |
936 | & "'C'P'P types", N); |
937 | end if; | |
996ae0b0 RK |
938 | |
939 | -- OK if we are in initialization procedure for the type | |
940 | -- in question, in which case the reference to the type | |
941 | -- is rewritten as a reference to the current object. | |
942 | ||
943 | elsif Ekind (Scop) = E_Procedure | |
fbf5a39b | 944 | and then Is_Init_Proc (Scop) |
996ae0b0 RK |
945 | and then Etype (First_Formal (Scop)) = Typ |
946 | then | |
947 | Rewrite (N, | |
948 | Make_Attribute_Reference (Loc, | |
949 | Prefix => Make_Identifier (Loc, Name_uInit), | |
950 | Attribute_Name => Name_Unrestricted_Access)); | |
951 | Analyze (N); | |
952 | return; | |
953 | ||
954 | -- OK if a task type, this test needs sharpening up ??? | |
955 | ||
956 | elsif Is_Task_Type (Typ) then | |
957 | null; | |
958 | ||
468c6c8a ES |
959 | -- OK if self-reference in an aggregate in Ada 2005, and |
960 | -- the reference comes from a copied default expression. | |
961 | ||
822033eb HK |
962 | -- Note that we check legality of self-reference even if the |
963 | -- expression comes from source, e.g. when a single component | |
964 | -- association in an aggregate has a box association. | |
965 | ||
0791fbe9 | 966 | elsif Ada_Version >= Ada_2005 |
468c6c8a ES |
967 | and then OK_Self_Reference |
968 | then | |
969 | null; | |
970 | ||
ae8c7d87 | 971 | -- OK if reference to current instance of a protected object |
2d14501c ST |
972 | |
973 | elsif Is_Protected_Self_Reference (P) then | |
974 | null; | |
975 | ||
996ae0b0 RK |
976 | -- Otherwise we have an error case |
977 | ||
978 | else | |
979 | Error_Attr ("% attribute cannot be applied to type", P); | |
980 | return; | |
981 | end if; | |
982 | end if; | |
983 | end if; | |
984 | ||
b07b7ace AC |
985 | -- If we fall through, we have a normal access to object case |
986 | ||
987 | -- Unrestricted_Access is (for now) legal wherever an allocator would | |
988 | -- be legal, so its Etype is set to E_Allocator. The expected type | |
996ae0b0 RK |
989 | -- of the other attributes is a general access type, and therefore |
990 | -- we label them with E_Access_Attribute_Type. | |
991 | ||
992 | if not Is_Overloaded (P) then | |
993 | Acc_Type := Build_Access_Object_Type (P_Type); | |
994 | Set_Etype (N, Acc_Type); | |
b07b7ace | 995 | |
996ae0b0 RK |
996 | else |
997 | declare | |
998 | Index : Interp_Index; | |
999 | It : Interp; | |
996ae0b0 RK |
1000 | begin |
1001 | Set_Etype (N, Any_Type); | |
1002 | Get_First_Interp (P, Index, It); | |
996ae0b0 RK |
1003 | while Present (It.Typ) loop |
1004 | Acc_Type := Build_Access_Object_Type (It.Typ); | |
1005 | Add_One_Interp (N, Acc_Type, Acc_Type); | |
1006 | Get_Next_Interp (Index, It); | |
1007 | end loop; | |
1008 | end; | |
1009 | end if; | |
1010 | ||
6f31a9d7 | 1011 | -- Special cases when we can find a prefix that is an entity name |
fbf5a39b | 1012 | |
6f31a9d7 RD |
1013 | declare |
1014 | PP : Node_Id; | |
1015 | Ent : Entity_Id; | |
1016 | ||
1017 | begin | |
1018 | PP := P; | |
1019 | loop | |
1020 | if Is_Entity_Name (PP) then | |
1021 | Ent := Entity (PP); | |
822033eb | 1022 | |
6f31a9d7 RD |
1023 | -- If we have an access to an object, and the attribute |
1024 | -- comes from source, then set the object as potentially | |
1025 | -- source modified. We do this because the resulting access | |
1026 | -- pointer can be used to modify the variable, and we might | |
1027 | -- not detect this, leading to some junk warnings. | |
822033eb | 1028 | |
74014283 RD |
1029 | -- We only do this for source references, since otherwise |
1030 | -- we can suppress warnings, e.g. from the unrestricted | |
1031 | -- access generated for validity checks in -gnatVa mode. | |
1032 | ||
1033 | if Comes_From_Source (N) then | |
1034 | Set_Never_Set_In_Source (Ent, False); | |
1035 | end if; | |
822033eb | 1036 | |
6f31a9d7 | 1037 | -- Mark entity as address taken, and kill current values |
822033eb | 1038 | |
6f31a9d7 RD |
1039 | Set_Address_Taken (Ent); |
1040 | Kill_Current_Values (Ent); | |
1041 | exit; | |
1042 | ||
e10dab7f JM |
1043 | elsif Nkind_In (PP, N_Selected_Component, |
1044 | N_Indexed_Component) | |
6f31a9d7 RD |
1045 | then |
1046 | PP := Prefix (PP); | |
1047 | ||
1048 | else | |
1049 | exit; | |
1050 | end if; | |
1051 | end loop; | |
1052 | end; | |
fbf5a39b | 1053 | |
b07b7ace AC |
1054 | -- Check for aliased view.. We allow a nonaliased prefix when within |
1055 | -- an instance because the prefix may have been a tagged formal | |
1056 | -- object, which is defined to be aliased even when the actual | |
1057 | -- might not be (other instance cases will have been caught in the | |
1058 | -- generic). Similarly, within an inlined body we know that the | |
1059 | -- attribute is legal in the original subprogram, and therefore | |
1060 | -- legal in the expansion. | |
996ae0b0 | 1061 | |
b07b7ace | 1062 | if not Is_Aliased_View (P) |
996ae0b0 | 1063 | and then not In_Instance |
a41ea816 | 1064 | and then not In_Inlined_Body |
715e529d | 1065 | and then Comes_From_Source (N) |
996ae0b0 | 1066 | then |
b07b7ace AC |
1067 | -- Here we have a non-aliased view. This is illegal unless we |
1068 | -- have the case of Unrestricted_Access, where for now we allow | |
1069 | -- this (we will reject later if expected type is access to an | |
1070 | -- unconstrained array with a thin pointer). | |
1071 | ||
715e529d AC |
1072 | -- No need for an error message on a generated access reference |
1073 | -- for the controlling argument in a dispatching call: error will | |
1074 | -- be reported when resolving the call. | |
1075 | ||
b07b7ace AC |
1076 | if Aname /= Name_Unrestricted_Access then |
1077 | Error_Attr_P ("prefix of % attribute must be aliased"); | |
1078 | Check_No_Implicit_Aliasing (P); | |
1079 | ||
1080 | -- For Unrestricted_Access, record that prefix is not aliased | |
1081 | -- to simplify legality check later on. | |
1082 | ||
1083 | else | |
1084 | Set_Non_Aliased_Prefix (N); | |
1085 | end if; | |
1086 | ||
1087 | -- If we have an aliased view, and we have Unrestricted_Access, then | |
1088 | -- output a warning that Unchecked_Access would have been fine, and | |
1089 | -- change the node to be Unchecked_Access. | |
1090 | ||
1091 | else | |
1092 | -- For now, hold off on this change ??? | |
1093 | ||
1094 | null; | |
996ae0b0 | 1095 | end if; |
fbf5a39b | 1096 | end Analyze_Access_Attribute; |
996ae0b0 | 1097 | |
b6a56408 AC |
1098 | ---------------------------------- |
1099 | -- Analyze_Attribute_Old_Result -- | |
1100 | ---------------------------------- | |
1101 | ||
1102 | procedure Analyze_Attribute_Old_Result | |
1103 | (Legal : out Boolean; | |
1104 | Spec_Id : out Entity_Id) | |
1105 | is | |
1106 | procedure Check_Placement_In_Check (Prag : Node_Id); | |
1107 | -- Verify that the attribute appears within pragma Check that mimics | |
1108 | -- a postcondition. | |
1109 | ||
1110 | procedure Check_Placement_In_Contract_Cases (Prag : Node_Id); | |
1111 | -- Verify that the attribute appears within a consequence of aspect | |
1112 | -- or pragma Contract_Cases denoted by Prag. | |
1113 | ||
1114 | procedure Check_Placement_In_Test_Case (Prag : Node_Id); | |
1115 | -- Verify that the attribute appears within the "Ensures" argument of | |
1116 | -- aspect or pragma Test_Case denoted by Prag. | |
1117 | ||
1118 | function Is_Within | |
1119 | (Nod : Node_Id; | |
1120 | Encl_Nod : Node_Id) return Boolean; | |
1121 | -- Subsidiary to Check_Placemenet_In_XXX. Determine whether arbitrary | |
1122 | -- node Nod is within enclosing node Encl_Nod. | |
1123 | ||
26f36fc9 AC |
1124 | procedure Placement_Error; |
1125 | -- Emit a general error when the attributes does not appear in a | |
1126 | -- postcondition-like aspect or pragma. | |
1127 | ||
b6a56408 AC |
1128 | ------------------------------ |
1129 | -- Check_Placement_In_Check -- | |
1130 | ------------------------------ | |
1131 | ||
1132 | procedure Check_Placement_In_Check (Prag : Node_Id) is | |
1133 | Args : constant List_Id := Pragma_Argument_Associations (Prag); | |
1134 | Nam : constant Name_Id := Chars (Get_Pragma_Arg (First (Args))); | |
1135 | ||
1136 | begin | |
1137 | -- The "Name" argument of pragma Check denotes a postcondition | |
1138 | ||
1139 | if Nam_In (Nam, Name_Post, | |
1140 | Name_Post_Class, | |
1141 | Name_Postcondition, | |
1142 | Name_Refined_Post) | |
1143 | then | |
1144 | null; | |
1145 | ||
1146 | -- Otherwise the placement of the attribute is illegal | |
1147 | ||
1148 | else | |
26f36fc9 | 1149 | Placement_Error; |
b6a56408 AC |
1150 | end if; |
1151 | end Check_Placement_In_Check; | |
1152 | ||
1153 | --------------------------------------- | |
1154 | -- Check_Placement_In_Contract_Cases -- | |
1155 | --------------------------------------- | |
1156 | ||
1157 | procedure Check_Placement_In_Contract_Cases (Prag : Node_Id) is | |
1158 | Arg : Node_Id; | |
1159 | Cases : Node_Id; | |
1160 | CCase : Node_Id; | |
1161 | ||
1162 | begin | |
1163 | -- Obtain the argument of the aspect or pragma | |
1164 | ||
1165 | if Nkind (Prag) = N_Aspect_Specification then | |
1166 | Arg := Prag; | |
1167 | else | |
1168 | Arg := First (Pragma_Argument_Associations (Prag)); | |
1169 | end if; | |
1170 | ||
1171 | Cases := Expression (Arg); | |
1172 | ||
1173 | if Present (Component_Associations (Cases)) then | |
1174 | CCase := First (Component_Associations (Cases)); | |
1175 | while Present (CCase) loop | |
1176 | ||
1177 | -- Detect whether the attribute appears within the | |
1178 | -- consequence of the current contract case. | |
1179 | ||
1180 | if Nkind (CCase) = N_Component_Association | |
1181 | and then Is_Within (N, Expression (CCase)) | |
1182 | then | |
1183 | return; | |
1184 | end if; | |
1185 | ||
1186 | Next (CCase); | |
1187 | end loop; | |
1188 | end if; | |
1189 | ||
1190 | -- Otherwise aspect or pragma Contract_Cases is either malformed | |
1191 | -- or the attribute does not appear within a consequence. | |
1192 | ||
1193 | Error_Attr | |
1194 | ("attribute % must appear in the consequence of a contract case", | |
1195 | P); | |
1196 | end Check_Placement_In_Contract_Cases; | |
1197 | ||
1198 | ---------------------------------- | |
1199 | -- Check_Placement_In_Test_Case -- | |
1200 | ---------------------------------- | |
1201 | ||
1202 | procedure Check_Placement_In_Test_Case (Prag : Node_Id) is | |
1203 | Arg : constant Node_Id := | |
1204 | Test_Case_Arg | |
1205 | (Prag => Prag, | |
1206 | Arg_Nam => Name_Ensures, | |
1207 | From_Aspect => Nkind (Prag) = N_Aspect_Specification); | |
1208 | ||
1209 | begin | |
1210 | -- Detect whether the attribute appears within the "Ensures" | |
1211 | -- expression of aspect or pragma Test_Case. | |
1212 | ||
1213 | if Present (Arg) and then Is_Within (N, Arg) then | |
1214 | null; | |
1215 | ||
1216 | else | |
1217 | Error_Attr | |
1218 | ("attribute % must appear in the ensures expression of a " | |
1219 | & "test case", P); | |
1220 | end if; | |
1221 | end Check_Placement_In_Test_Case; | |
1222 | ||
1223 | --------------- | |
1224 | -- Is_Within -- | |
1225 | --------------- | |
1226 | ||
1227 | function Is_Within | |
1228 | (Nod : Node_Id; | |
1229 | Encl_Nod : Node_Id) return Boolean | |
1230 | is | |
1231 | Par : Node_Id; | |
1232 | ||
1233 | begin | |
1234 | Par := Nod; | |
1235 | while Present (Par) loop | |
1236 | if Par = Encl_Nod then | |
1237 | return True; | |
1238 | ||
1239 | -- Prevent the search from going too far | |
1240 | ||
1241 | elsif Is_Body_Or_Package_Declaration (Par) then | |
1242 | exit; | |
1243 | end if; | |
1244 | ||
1245 | Par := Parent (Par); | |
1246 | end loop; | |
1247 | ||
1248 | return False; | |
1249 | end Is_Within; | |
1250 | ||
26f36fc9 AC |
1251 | --------------------- |
1252 | -- Placement_Error -- | |
1253 | --------------------- | |
1254 | ||
1255 | procedure Placement_Error is | |
1256 | begin | |
1257 | if Aname = Name_Old then | |
1258 | Error_Attr ("attribute % can only appear in postcondition", P); | |
1259 | ||
1260 | -- Specialize the error message for attribute 'Result | |
1261 | ||
1262 | else | |
1263 | Error_Attr | |
1264 | ("attribute % can only appear in postcondition of function", | |
1265 | P); | |
1266 | end if; | |
1267 | end Placement_Error; | |
1268 | ||
b6a56408 AC |
1269 | -- Local variables |
1270 | ||
1271 | Prag : Node_Id; | |
1272 | Prag_Nam : Name_Id; | |
1273 | Subp_Decl : Node_Id; | |
1274 | ||
1275 | -- Start of processing for Analyze_Attribute_Old_Result | |
1276 | ||
1277 | begin | |
1278 | -- Assume that the attribute is illegal | |
1279 | ||
1280 | Legal := False; | |
1281 | Spec_Id := Empty; | |
1282 | ||
1283 | -- Traverse the parent chain to find the aspect or pragma where the | |
1284 | -- attribute resides. | |
1285 | ||
1286 | Prag := N; | |
1287 | while Present (Prag) loop | |
1288 | if Nkind_In (Prag, N_Aspect_Specification, N_Pragma) then | |
1289 | exit; | |
1290 | ||
1291 | -- Prevent the search from going too far | |
1292 | ||
1293 | elsif Is_Body_Or_Package_Declaration (Prag) then | |
1294 | exit; | |
1295 | end if; | |
1296 | ||
1297 | Prag := Parent (Prag); | |
1298 | end loop; | |
1299 | ||
1300 | -- The attribute is allowed to appear only in postcondition-like | |
1301 | -- aspects or pragmas. | |
1302 | ||
1303 | if Nkind_In (Prag, N_Aspect_Specification, N_Pragma) then | |
1304 | if Nkind (Prag) = N_Aspect_Specification then | |
1305 | Prag_Nam := Chars (Identifier (Prag)); | |
1306 | else | |
1307 | Prag_Nam := Pragma_Name (Prag); | |
1308 | end if; | |
1309 | ||
1310 | if Prag_Nam = Name_Check then | |
1311 | Check_Placement_In_Check (Prag); | |
1312 | ||
1313 | elsif Prag_Nam = Name_Contract_Cases then | |
1314 | Check_Placement_In_Contract_Cases (Prag); | |
1315 | ||
caf07df9 AC |
1316 | -- Attribute 'Result is allowed to appear in aspect or pragma |
1317 | -- [Refined_]Depends (SPARK RM 6.1.5(11)). | |
1318 | ||
1319 | elsif Nam_In (Prag_Nam, Name_Depends, Name_Refined_Depends) | |
1320 | and then Aname = Name_Result | |
1321 | then | |
1322 | null; | |
1323 | ||
b6a56408 AC |
1324 | elsif Nam_In (Prag_Nam, Name_Post, |
1325 | Name_Post_Class, | |
1326 | Name_Postcondition, | |
1327 | Name_Refined_Post) | |
1328 | then | |
1329 | null; | |
1330 | ||
1331 | elsif Prag_Nam = Name_Test_Case then | |
1332 | Check_Placement_In_Test_Case (Prag); | |
1333 | ||
1334 | else | |
26f36fc9 | 1335 | Placement_Error; |
b6a56408 AC |
1336 | return; |
1337 | end if; | |
1338 | ||
1339 | -- Otherwise the placement of the attribute is illegal | |
1340 | ||
1341 | else | |
26f36fc9 | 1342 | Placement_Error; |
b6a56408 AC |
1343 | return; |
1344 | end if; | |
1345 | ||
1346 | -- Find the related subprogram subject to the aspect or pragma | |
1347 | ||
1348 | if Nkind (Prag) = N_Aspect_Specification then | |
1349 | Subp_Decl := Parent (Prag); | |
1350 | else | |
f99ff327 | 1351 | Subp_Decl := Find_Related_Declaration_Or_Body (Prag); |
b6a56408 AC |
1352 | end if; |
1353 | ||
1354 | -- The aspect or pragma where the attribute resides should be | |
1355 | -- associated with a subprogram declaration or a body. If this is not | |
1356 | -- the case, then the aspect or pragma is illegal. Return as analysis | |
0c3f76ba AC |
1357 | -- cannot be carried out. Note that it is legal to have the aspect |
1358 | -- appear on a subprogram renaming, when the renamed entity is an | |
1359 | -- attribute reference. | |
b6a56408 AC |
1360 | |
1361 | if not Nkind_In (Subp_Decl, N_Abstract_Subprogram_Declaration, | |
1362 | N_Entry_Declaration, | |
1363 | N_Generic_Subprogram_Declaration, | |
1364 | N_Subprogram_Body, | |
1365 | N_Subprogram_Body_Stub, | |
0c3f76ba AC |
1366 | N_Subprogram_Declaration, |
1367 | N_Subprogram_Renaming_Declaration) | |
b6a56408 AC |
1368 | then |
1369 | return; | |
1370 | end if; | |
1371 | ||
1372 | -- If we get here, then the attribute is legal | |
1373 | ||
1374 | Legal := True; | |
877a5a12 | 1375 | Spec_Id := Unique_Defining_Entity (Subp_Decl); |
1ba563f5 AC |
1376 | |
1377 | -- When generating C code, nested _postcondition subprograms are | |
1378 | -- inlined by the front end to avoid problems (when unnested) with | |
1379 | -- referenced itypes. Handle that here, since as part of inlining the | |
1380 | -- expander nests subprogram within a dummy procedure named _parent | |
1381 | -- (see Build_Postconditions_Procedure and Build_Body_To_Inline). | |
1382 | -- Hence, in this context, the spec_id of _postconditions is the | |
1383 | -- enclosing scope. | |
1384 | ||
64f5d139 | 1385 | if Modify_Tree_For_C |
1ba563f5 AC |
1386 | and then Chars (Spec_Id) = Name_uParent |
1387 | and then Chars (Scope (Spec_Id)) = Name_uPostconditions | |
1388 | then | |
64f5d139 | 1389 | -- This situation occurs only when preanalyzing the inlined body |
fb757f7d | 1390 | |
64f5d139 JM |
1391 | pragma Assert (not Full_Analysis); |
1392 | ||
1ba563f5 AC |
1393 | Spec_Id := Scope (Spec_Id); |
1394 | pragma Assert (Is_Inlined (Spec_Id)); | |
1395 | end if; | |
b6a56408 AC |
1396 | end Analyze_Attribute_Old_Result; |
1397 | ||
26df19ce AC |
1398 | --------------------------------- |
1399 | -- Bad_Attribute_For_Predicate -- | |
1400 | --------------------------------- | |
1401 | ||
1402 | procedure Bad_Attribute_For_Predicate is | |
1403 | begin | |
9515740f | 1404 | if Is_Scalar_Type (P_Type) |
739e7bbf | 1405 | and then Comes_From_Source (N) |
9515740f | 1406 | then |
26df19ce | 1407 | Error_Msg_Name_1 := Aname; |
86200f66 | 1408 | Bad_Predicated_Subtype_Use |
ed00f472 | 1409 | ("type& has predicates, attribute % not allowed", N, P_Type); |
26df19ce AC |
1410 | end if; |
1411 | end Bad_Attribute_For_Predicate; | |
1412 | ||
996ae0b0 RK |
1413 | -------------------------------- |
1414 | -- Check_Array_Or_Scalar_Type -- | |
1415 | -------------------------------- | |
1416 | ||
1417 | procedure Check_Array_Or_Scalar_Type is | |
268aeaa9 AC |
1418 | function In_Aspect_Specification return Boolean; |
1419 | -- A current instance of a type in an aspect specification is an | |
1420 | -- object and not a type, and therefore cannot be of a scalar type | |
1421 | -- in the prefix of one of the array attributes if the attribute | |
1422 | -- reference is part of an aspect expression. | |
1423 | ||
1424 | ----------------------------- | |
1425 | -- In_Aspect_Specification -- | |
1426 | ----------------------------- | |
1427 | ||
1428 | function In_Aspect_Specification return Boolean is | |
1429 | P : Node_Id; | |
1430 | ||
1431 | begin | |
1432 | P := Parent (N); | |
1433 | while Present (P) loop | |
1434 | if Nkind (P) = N_Aspect_Specification then | |
1435 | return P_Type = Entity (P); | |
1436 | ||
1437 | elsif Nkind (P) in N_Declaration then | |
1438 | return False; | |
1439 | end if; | |
1440 | ||
1441 | P := Parent (P); | |
1442 | end loop; | |
1443 | ||
1444 | return False; | |
1445 | end In_Aspect_Specification; | |
1446 | ||
1447 | -- Local variables | |
1448 | ||
1449 | Dims : Int; | |
996ae0b0 RK |
1450 | Index : Entity_Id; |
1451 | ||
268aeaa9 | 1452 | -- Start of processing for Check_Array_Or_Scalar_Type |
996ae0b0 RK |
1453 | |
1454 | begin | |
1455 | -- Case of string literal or string literal subtype. These cases | |
1456 | -- cannot arise from legal Ada code, but the expander is allowed | |
1457 | -- to generate them. They require special handling because string | |
1458 | -- literal subtypes do not have standard bounds (the whole idea | |
1459 | -- of these subtypes is to avoid having to generate the bounds) | |
1460 | ||
1461 | if Ekind (P_Type) = E_String_Literal_Subtype then | |
1462 | Set_Etype (N, Etype (First_Index (P_Base_Type))); | |
1463 | return; | |
1464 | ||
1465 | -- Scalar types | |
1466 | ||
1467 | elsif Is_Scalar_Type (P_Type) then | |
1468 | Check_Type; | |
1469 | ||
1470 | if Present (E1) then | |
1471 | Error_Attr ("invalid argument in % attribute", E1); | |
268aeaa9 AC |
1472 | |
1473 | elsif In_Aspect_Specification then | |
1474 | Error_Attr | |
1475 | ("prefix of % attribute cannot be the current instance of a " | |
1476 | & "scalar type", P); | |
1477 | ||
996ae0b0 RK |
1478 | else |
1479 | Set_Etype (N, P_Base_Type); | |
1480 | return; | |
1481 | end if; | |
1482 | ||
1483 | -- The following is a special test to allow 'First to apply to | |
1484 | -- private scalar types if the attribute comes from generated | |
1485 | -- code. This occurs in the case of Normalize_Scalars code. | |
1486 | ||
1487 | elsif Is_Private_Type (P_Type) | |
1488 | and then Present (Full_View (P_Type)) | |
1489 | and then Is_Scalar_Type (Full_View (P_Type)) | |
1490 | and then not Comes_From_Source (N) | |
1491 | then | |
1492 | Set_Etype (N, Implementation_Base_Type (P_Type)); | |
1493 | ||
1494 | -- Array types other than string literal subtypes handled above | |
1495 | ||
1496 | else | |
1497 | Check_Array_Type; | |
1498 | ||
1499 | -- We know prefix is an array type, or the name of an array | |
1500 | -- object, and that the expression, if present, is static | |
1501 | -- and within the range of the dimensions of the type. | |
1502 | ||
5453d5bd AC |
1503 | pragma Assert (Is_Array_Type (P_Type)); |
1504 | Index := First_Index (P_Base_Type); | |
996ae0b0 RK |
1505 | |
1506 | if No (E1) then | |
1507 | ||
1508 | -- First dimension assumed | |
1509 | ||
1510 | Set_Etype (N, Base_Type (Etype (Index))); | |
1511 | ||
1512 | else | |
268aeaa9 | 1513 | Dims := UI_To_Int (Intval (E1)); |
996ae0b0 | 1514 | |
268aeaa9 | 1515 | for J in 1 .. Dims - 1 loop |
996ae0b0 RK |
1516 | Next_Index (Index); |
1517 | end loop; | |
1518 | ||
1519 | Set_Etype (N, Base_Type (Etype (Index))); | |
1520 | Set_Etype (E1, Standard_Integer); | |
1521 | end if; | |
1522 | end if; | |
1523 | end Check_Array_Or_Scalar_Type; | |
1524 | ||
1525 | ---------------------- | |
1526 | -- Check_Array_Type -- | |
1527 | ---------------------- | |
1528 | ||
1529 | procedure Check_Array_Type is | |
1530 | D : Int; | |
edd63e9b | 1531 | -- Dimension number for array attributes |
996ae0b0 RK |
1532 | |
1533 | begin | |
1534 | -- If the type is a string literal type, then this must be generated | |
1535 | -- internally, and no further check is required on its legality. | |
1536 | ||
1537 | if Ekind (P_Type) = E_String_Literal_Subtype then | |
1538 | return; | |
1539 | ||
1540 | -- If the type is a composite, it is an illegal aggregate, no point | |
1541 | -- in going on. | |
1542 | ||
1543 | elsif P_Type = Any_Composite then | |
1544 | raise Bad_Attribute; | |
1545 | end if; | |
1546 | ||
1547 | -- Normal case of array type or subtype | |
1548 | ||
1549 | Check_Either_E0_Or_E1; | |
5453d5bd | 1550 | Check_Dereference; |
996ae0b0 RK |
1551 | |
1552 | if Is_Array_Type (P_Type) then | |
1553 | if not Is_Constrained (P_Type) | |
1554 | and then Is_Entity_Name (P) | |
1555 | and then Is_Type (Entity (P)) | |
1556 | then | |
1557 | -- Note: we do not call Error_Attr here, since we prefer to | |
1558 | -- continue, using the relevant index type of the array, | |
1559 | -- even though it is unconstrained. This gives better error | |
1560 | -- recovery behavior. | |
1561 | ||
1562 | Error_Msg_Name_1 := Aname; | |
822033eb | 1563 | Error_Msg_F |
996ae0b0 RK |
1564 | ("prefix for % attribute must be constrained array", P); |
1565 | end if; | |
1566 | ||
ca1ffed0 AC |
1567 | -- The attribute reference freezes the type, and thus the |
1568 | -- component type, even if the attribute may not depend on the | |
1569 | -- component. Diagnose arrays with incomplete components now. | |
1570 | -- If the prefix is an access to array, this does not freeze | |
1571 | -- the designated type. | |
1572 | ||
1573 | if Nkind (P) /= N_Explicit_Dereference then | |
1574 | Check_Fully_Declared (Component_Type (P_Type), P); | |
1575 | end if; | |
1576 | ||
996ae0b0 RK |
1577 | D := Number_Dimensions (P_Type); |
1578 | ||
996ae0b0 RK |
1579 | else |
1580 | if Is_Private_Type (P_Type) then | |
822033eb | 1581 | Error_Attr_P ("prefix for % attribute may not be private type"); |
996ae0b0 | 1582 | |
5453d5bd AC |
1583 | elsif Is_Access_Type (P_Type) |
1584 | and then Is_Array_Type (Designated_Type (P_Type)) | |
1585 | and then Is_Entity_Name (P) | |
1586 | and then Is_Type (Entity (P)) | |
1587 | then | |
822033eb | 1588 | Error_Attr_P ("prefix of % attribute cannot be access type"); |
5453d5bd | 1589 | |
996ae0b0 RK |
1590 | elsif Attr_Id = Attribute_First |
1591 | or else | |
1592 | Attr_Id = Attribute_Last | |
1593 | then | |
1594 | Error_Attr ("invalid prefix for % attribute", P); | |
1595 | ||
1596 | else | |
822033eb | 1597 | Error_Attr_P ("prefix for % attribute must be array"); |
996ae0b0 RK |
1598 | end if; |
1599 | end if; | |
1600 | ||
1601 | if Present (E1) then | |
1602 | Resolve (E1, Any_Integer); | |
1603 | Set_Etype (E1, Standard_Integer); | |
1604 | ||
edab6088 | 1605 | if not Is_OK_Static_Expression (E1) |
996ae0b0 RK |
1606 | or else Raises_Constraint_Error (E1) |
1607 | then | |
fbf5a39b AC |
1608 | Flag_Non_Static_Expr |
1609 | ("expression for dimension must be static!", E1); | |
1610 | Error_Attr; | |
996ae0b0 | 1611 | |
9fe696a3 | 1612 | elsif UI_To_Int (Expr_Value (E1)) > D |
996ae0b0 RK |
1613 | or else UI_To_Int (Expr_Value (E1)) < 1 |
1614 | then | |
1615 | Error_Attr ("invalid dimension number for array type", E1); | |
1616 | end if; | |
1617 | end if; | |
fea9e956 ES |
1618 | |
1619 | if (Style_Check and Style_Check_Array_Attribute_Index) | |
1620 | and then Comes_From_Source (N) | |
1621 | then | |
1622 | Style.Check_Array_Attribute_Index (N, E1, D); | |
1623 | end if; | |
996ae0b0 RK |
1624 | end Check_Array_Type; |
1625 | ||
1626 | ------------------------- | |
1627 | -- Check_Asm_Attribute -- | |
1628 | ------------------------- | |
1629 | ||
1630 | procedure Check_Asm_Attribute is | |
1631 | begin | |
1632 | Check_Type; | |
1633 | Check_E2; | |
1634 | ||
1635 | -- Check first argument is static string expression | |
1636 | ||
1637 | Analyze_And_Resolve (E1, Standard_String); | |
1638 | ||
1639 | if Etype (E1) = Any_Type then | |
1640 | return; | |
1641 | ||
1642 | elsif not Is_OK_Static_Expression (E1) then | |
fbf5a39b AC |
1643 | Flag_Non_Static_Expr |
1644 | ("constraint argument must be static string expression!", E1); | |
1645 | Error_Attr; | |
996ae0b0 RK |
1646 | end if; |
1647 | ||
1648 | -- Check second argument is right type | |
1649 | ||
1650 | Analyze_And_Resolve (E2, Entity (P)); | |
1651 | ||
1652 | -- Note: that is all we need to do, we don't need to check | |
1653 | -- that it appears in a correct context. The Ada type system | |
1654 | -- will do that for us. | |
1655 | ||
1656 | end Check_Asm_Attribute; | |
1657 | ||
1658 | --------------------- | |
1659 | -- Check_Component -- | |
1660 | --------------------- | |
1661 | ||
1662 | procedure Check_Component is | |
1663 | begin | |
1664 | Check_E0; | |
1665 | ||
1666 | if Nkind (P) /= N_Selected_Component | |
1667 | or else | |
1668 | (Ekind (Entity (Selector_Name (P))) /= E_Component | |
1669 | and then | |
1670 | Ekind (Entity (Selector_Name (P))) /= E_Discriminant) | |
1671 | then | |
822033eb | 1672 | Error_Attr_P ("prefix for % attribute must be selected component"); |
996ae0b0 RK |
1673 | end if; |
1674 | end Check_Component; | |
1675 | ||
1676 | ------------------------------------ | |
1677 | -- Check_Decimal_Fixed_Point_Type -- | |
1678 | ------------------------------------ | |
1679 | ||
1680 | procedure Check_Decimal_Fixed_Point_Type is | |
1681 | begin | |
1682 | Check_Type; | |
1683 | ||
1684 | if not Is_Decimal_Fixed_Point_Type (P_Type) then | |
822033eb | 1685 | Error_Attr_P ("prefix of % attribute must be decimal type"); |
996ae0b0 RK |
1686 | end if; |
1687 | end Check_Decimal_Fixed_Point_Type; | |
1688 | ||
1689 | ----------------------- | |
1690 | -- Check_Dereference -- | |
1691 | ----------------------- | |
1692 | ||
1693 | procedure Check_Dereference is | |
1694 | begin | |
6d11af89 AC |
1695 | |
1696 | -- Case of a subtype mark | |
1697 | ||
b285815e | 1698 | if Is_Entity_Name (P) and then Is_Type (Entity (P)) then |
6d11af89 AC |
1699 | return; |
1700 | end if; | |
1701 | ||
1702 | -- Case of an expression | |
1703 | ||
1704 | Resolve (P); | |
cc335f43 | 1705 | |
6d11af89 | 1706 | if Is_Access_Type (P_Type) then |
5453d5bd | 1707 | |
b285815e RD |
1708 | -- If there is an implicit dereference, then we must freeze the |
1709 | -- designated type of the access type, since the type of the | |
1710 | -- referenced array is this type (see AI95-00106). | |
b9262540 | 1711 | |
3249690d | 1712 | -- As done elsewhere, freezing must not happen when pre-analyzing |
b285815e RD |
1713 | -- a pre- or postcondition or a default value for an object or for |
1714 | -- a formal parameter. | |
5453d5bd | 1715 | |
3249690d AC |
1716 | if not In_Spec_Expression then |
1717 | Freeze_Before (N, Designated_Type (P_Type)); | |
1718 | end if; | |
5453d5bd | 1719 | |
996ae0b0 RK |
1720 | Rewrite (P, |
1721 | Make_Explicit_Dereference (Sloc (P), | |
1722 | Prefix => Relocate_Node (P))); | |
1723 | ||
1724 | Analyze_And_Resolve (P); | |
1725 | P_Type := Etype (P); | |
1726 | ||
1727 | if P_Type = Any_Type then | |
1728 | raise Bad_Attribute; | |
1729 | end if; | |
1730 | ||
1731 | P_Base_Type := Base_Type (P_Type); | |
996ae0b0 RK |
1732 | end if; |
1733 | end Check_Dereference; | |
1734 | ||
1735 | ------------------------- | |
1736 | -- Check_Discrete_Type -- | |
1737 | ------------------------- | |
1738 | ||
1739 | procedure Check_Discrete_Type is | |
1740 | begin | |
1741 | Check_Type; | |
1742 | ||
1743 | if not Is_Discrete_Type (P_Type) then | |
822033eb | 1744 | Error_Attr_P ("prefix of % attribute must be discrete type"); |
996ae0b0 RK |
1745 | end if; |
1746 | end Check_Discrete_Type; | |
1747 | ||
1748 | -------------- | |
1749 | -- Check_E0 -- | |
1750 | -------------- | |
1751 | ||
1752 | procedure Check_E0 is | |
1753 | begin | |
1754 | if Present (E1) then | |
1755 | Unexpected_Argument (E1); | |
1756 | end if; | |
1757 | end Check_E0; | |
1758 | ||
1759 | -------------- | |
1760 | -- Check_E1 -- | |
1761 | -------------- | |
1762 | ||
1763 | procedure Check_E1 is | |
1764 | begin | |
1765 | Check_Either_E0_Or_E1; | |
1766 | ||
1767 | if No (E1) then | |
1768 | ||
1769 | -- Special-case attributes that are functions and that appear as | |
1770 | -- the prefix of another attribute. Error is posted on parent. | |
1771 | ||
1772 | if Nkind (Parent (N)) = N_Attribute_Reference | |
b69cd36a AC |
1773 | and then Nam_In (Attribute_Name (Parent (N)), Name_Address, |
1774 | Name_Code_Address, | |
1775 | Name_Access) | |
996ae0b0 RK |
1776 | then |
1777 | Error_Msg_Name_1 := Attribute_Name (Parent (N)); | |
1778 | Error_Msg_N ("illegal prefix for % attribute", Parent (N)); | |
1779 | Set_Etype (Parent (N), Any_Type); | |
1780 | Set_Entity (Parent (N), Any_Type); | |
1781 | raise Bad_Attribute; | |
1782 | ||
1783 | else | |
1784 | Error_Attr ("missing argument for % attribute", N); | |
1785 | end if; | |
1786 | end if; | |
1787 | end Check_E1; | |
1788 | ||
1789 | -------------- | |
1790 | -- Check_E2 -- | |
1791 | -------------- | |
1792 | ||
1793 | procedure Check_E2 is | |
1794 | begin | |
1795 | if No (E1) then | |
1796 | Error_Attr ("missing arguments for % attribute (2 required)", N); | |
1797 | elsif No (E2) then | |
1798 | Error_Attr ("missing argument for % attribute (2 required)", N); | |
1799 | end if; | |
1800 | end Check_E2; | |
1801 | ||
1802 | --------------------------- | |
1803 | -- Check_Either_E0_Or_E1 -- | |
1804 | --------------------------- | |
1805 | ||
1806 | procedure Check_Either_E0_Or_E1 is | |
1807 | begin | |
1808 | if Present (E2) then | |
1809 | Unexpected_Argument (E2); | |
1810 | end if; | |
1811 | end Check_Either_E0_Or_E1; | |
1812 | ||
1813 | ---------------------- | |
1814 | -- Check_Enum_Image -- | |
1815 | ---------------------- | |
1816 | ||
1817 | procedure Check_Enum_Image is | |
1818 | Lit : Entity_Id; | |
3e7302c3 | 1819 | |
996ae0b0 | 1820 | begin |
3e7302c3 AC |
1821 | -- When an enumeration type appears in an attribute reference, all |
1822 | -- literals of the type are marked as referenced. This must only be | |
1823 | -- done if the attribute reference appears in the current source. | |
1824 | -- Otherwise the information on references may differ between a | |
1825 | -- normal compilation and one that performs inlining. | |
1826 | ||
8097203f AC |
1827 | if Is_Enumeration_Type (P_Base_Type) |
1828 | and then In_Extended_Main_Code_Unit (N) | |
1829 | then | |
996ae0b0 RK |
1830 | Lit := First_Literal (P_Base_Type); |
1831 | while Present (Lit) loop | |
1832 | Set_Referenced (Lit); | |
1833 | Next_Literal (Lit); | |
1834 | end loop; | |
1835 | end if; | |
1836 | end Check_Enum_Image; | |
1837 | ||
011f9d5d AC |
1838 | ---------------------------- |
1839 | -- Check_First_Last_Valid -- | |
1840 | ---------------------------- | |
1841 | ||
1842 | procedure Check_First_Last_Valid is | |
1843 | begin | |
011f9d5d AC |
1844 | Check_Discrete_Type; |
1845 | ||
2a1b208c RD |
1846 | -- Freeze the subtype now, so that the following test for predicates |
1847 | -- works (we set the predicates stuff up at freeze time) | |
1848 | ||
1849 | Insert_Actions (N, Freeze_Entity (P_Type, P)); | |
1850 | ||
1851 | -- Now test for dynamic predicate | |
011f9d5d AC |
1852 | |
1853 | if Has_Predicates (P_Type) | |
60f908dd | 1854 | and then not (Has_Static_Predicate (P_Type)) |
011f9d5d AC |
1855 | then |
1856 | Error_Attr_P | |
1857 | ("prefix of % attribute may not have dynamic predicate"); | |
1858 | end if; | |
1859 | ||
2a1b208c RD |
1860 | -- Check non-static subtype |
1861 | ||
edab6088 | 1862 | if not Is_OK_Static_Subtype (P_Type) then |
2a1b208c RD |
1863 | Error_Attr_P ("prefix of % attribute must be a static subtype"); |
1864 | end if; | |
1865 | ||
1866 | -- Test case for no values | |
1867 | ||
011f9d5d AC |
1868 | if Expr_Value (Type_Low_Bound (P_Type)) > |
1869 | Expr_Value (Type_High_Bound (P_Type)) | |
1870 | or else (Has_Predicates (P_Type) | |
60f908dd RD |
1871 | and then |
1872 | Is_Empty_List (Static_Discrete_Predicate (P_Type))) | |
011f9d5d AC |
1873 | then |
1874 | Error_Attr_P | |
a905304c AC |
1875 | ("prefix of % attribute must be subtype with at least one " |
1876 | & "value"); | |
011f9d5d AC |
1877 | end if; |
1878 | end Check_First_Last_Valid; | |
1879 | ||
996ae0b0 RK |
1880 | ---------------------------- |
1881 | -- Check_Fixed_Point_Type -- | |
1882 | ---------------------------- | |
1883 | ||
1884 | procedure Check_Fixed_Point_Type is | |
1885 | begin | |
1886 | Check_Type; | |
1887 | ||
1888 | if not Is_Fixed_Point_Type (P_Type) then | |
822033eb | 1889 | Error_Attr_P ("prefix of % attribute must be fixed point type"); |
996ae0b0 RK |
1890 | end if; |
1891 | end Check_Fixed_Point_Type; | |
1892 | ||
1893 | ------------------------------ | |
1894 | -- Check_Fixed_Point_Type_0 -- | |
1895 | ------------------------------ | |
1896 | ||
1897 | procedure Check_Fixed_Point_Type_0 is | |
1898 | begin | |
1899 | Check_Fixed_Point_Type; | |
1900 | Check_E0; | |
1901 | end Check_Fixed_Point_Type_0; | |
1902 | ||
1903 | ------------------------------- | |
1904 | -- Check_Floating_Point_Type -- | |
1905 | ------------------------------- | |
1906 | ||
1907 | procedure Check_Floating_Point_Type is | |
1908 | begin | |
1909 | Check_Type; | |
1910 | ||
1911 | if not Is_Floating_Point_Type (P_Type) then | |
822033eb | 1912 | Error_Attr_P ("prefix of % attribute must be float type"); |
996ae0b0 RK |
1913 | end if; |
1914 | end Check_Floating_Point_Type; | |
1915 | ||
1916 | --------------------------------- | |
1917 | -- Check_Floating_Point_Type_0 -- | |
1918 | --------------------------------- | |
1919 | ||
1920 | procedure Check_Floating_Point_Type_0 is | |
1921 | begin | |
1922 | Check_Floating_Point_Type; | |
1923 | Check_E0; | |
1924 | end Check_Floating_Point_Type_0; | |
1925 | ||
1926 | --------------------------------- | |
1927 | -- Check_Floating_Point_Type_1 -- | |
1928 | --------------------------------- | |
1929 | ||
1930 | procedure Check_Floating_Point_Type_1 is | |
1931 | begin | |
1932 | Check_Floating_Point_Type; | |
1933 | Check_E1; | |
1934 | end Check_Floating_Point_Type_1; | |
1935 | ||
1936 | --------------------------------- | |
1937 | -- Check_Floating_Point_Type_2 -- | |
1938 | --------------------------------- | |
1939 | ||
1940 | procedure Check_Floating_Point_Type_2 is | |
1941 | begin | |
1942 | Check_Floating_Point_Type; | |
1943 | Check_E2; | |
1944 | end Check_Floating_Point_Type_2; | |
1945 | ||
1946 | ------------------------ | |
1947 | -- Check_Integer_Type -- | |
1948 | ------------------------ | |
1949 | ||
1950 | procedure Check_Integer_Type is | |
1951 | begin | |
1952 | Check_Type; | |
1953 | ||
1954 | if not Is_Integer_Type (P_Type) then | |
822033eb | 1955 | Error_Attr_P ("prefix of % attribute must be integer type"); |
996ae0b0 RK |
1956 | end if; |
1957 | end Check_Integer_Type; | |
1958 | ||
5f3ab6fb AC |
1959 | -------------------------------- |
1960 | -- Check_Modular_Integer_Type -- | |
1961 | -------------------------------- | |
1962 | ||
1963 | procedure Check_Modular_Integer_Type is | |
1964 | begin | |
1965 | Check_Type; | |
1966 | ||
1967 | if not Is_Modular_Integer_Type (P_Type) then | |
822033eb HK |
1968 | Error_Attr_P |
1969 | ("prefix of % attribute must be modular integer type"); | |
5f3ab6fb AC |
1970 | end if; |
1971 | end Check_Modular_Integer_Type; | |
1972 | ||
21d27997 RD |
1973 | ------------------------ |
1974 | -- Check_Not_CPP_Type -- | |
1975 | ------------------------ | |
1976 | ||
1977 | procedure Check_Not_CPP_Type is | |
1978 | begin | |
1979 | if Is_Tagged_Type (Etype (P)) | |
1980 | and then Convention (Etype (P)) = Convention_CPP | |
1981 | and then Is_CPP_Class (Root_Type (Etype (P))) | |
1982 | then | |
7052f54e KP |
1983 | Error_Attr_P |
1984 | ("invalid use of % attribute with 'C'P'P tagged type"); | |
21d27997 RD |
1985 | end if; |
1986 | end Check_Not_CPP_Type; | |
1987 | ||
996ae0b0 RK |
1988 | ------------------------------- |
1989 | -- Check_Not_Incomplete_Type -- | |
1990 | ------------------------------- | |
1991 | ||
1992 | procedure Check_Not_Incomplete_Type is | |
d8db0bca JM |
1993 | E : Entity_Id; |
1994 | Typ : Entity_Id; | |
1995 | ||
996ae0b0 | 1996 | begin |
d8db0bca JM |
1997 | -- Ada 2005 (AI-50217, AI-326): If the prefix is an explicit |
1998 | -- dereference we have to check wrong uses of incomplete types | |
1999 | -- (other wrong uses are checked at their freezing point). | |
2000 | ||
22efcab7 AC |
2001 | -- In Ada 2012, incomplete types can appear in subprogram |
2002 | -- profiles, but formals with incomplete types cannot be the | |
2003 | -- prefix of attributes. | |
2004 | ||
d8db0bca JM |
2005 | -- Example 1: Limited-with |
2006 | ||
2007 | -- limited with Pkg; | |
2008 | -- package P is | |
2009 | -- type Acc is access Pkg.T; | |
2010 | -- X : Acc; | |
2011 | -- S : Integer := X.all'Size; -- ERROR | |
2012 | -- end P; | |
2013 | ||
2014 | -- Example 2: Tagged incomplete | |
2015 | ||
2016 | -- type T is tagged; | |
2017 | -- type Acc is access all T; | |
2018 | -- X : Acc; | |
2019 | -- S : constant Integer := X.all'Size; -- ERROR | |
2020 | -- procedure Q (Obj : Integer := X.all'Alignment); -- ERROR | |
2021 | ||
0791fbe9 | 2022 | if Ada_Version >= Ada_2005 |
d8db0bca JM |
2023 | and then Nkind (P) = N_Explicit_Dereference |
2024 | then | |
2025 | E := P; | |
2026 | while Nkind (E) = N_Explicit_Dereference loop | |
2027 | E := Prefix (E); | |
2028 | end loop; | |
2029 | ||
c0985d4e HK |
2030 | Typ := Etype (E); |
2031 | ||
7b56a91b | 2032 | if From_Limited_With (Typ) then |
822033eb HK |
2033 | Error_Attr_P |
2034 | ("prefix of % attribute cannot be an incomplete type"); | |
d8db0bca | 2035 | |
22efcab7 | 2036 | -- If the prefix is an access type check the designated type |
c0985d4e | 2037 | |
22efcab7 AC |
2038 | elsif Is_Access_Type (Typ) |
2039 | and then Nkind (P) = N_Explicit_Dereference | |
2040 | then | |
2041 | Typ := Directly_Designated_Type (Typ); | |
2042 | end if; | |
2043 | ||
2044 | if Is_Class_Wide_Type (Typ) then | |
2045 | Typ := Root_Type (Typ); | |
2046 | end if; | |
2047 | ||
2048 | -- A legal use of a shadow entity occurs only when the unit where | |
2049 | -- the non-limited view resides is imported via a regular with | |
2050 | -- clause in the current body. Such references to shadow entities | |
2051 | -- may occur in subprogram formals. | |
2052 | ||
2053 | if Is_Incomplete_Type (Typ) | |
2054 | and then From_Limited_With (Typ) | |
2055 | and then Present (Non_Limited_View (Typ)) | |
2056 | and then Is_Legal_Shadow_Entity_In_Body (Typ) | |
2057 | then | |
2058 | Typ := Non_Limited_View (Typ); | |
2059 | end if; | |
c0985d4e | 2060 | |
22efcab7 AC |
2061 | -- If still incomplete, it can be a local incomplete type, or a |
2062 | -- limited view whose scope is also a limited view. | |
c0985d4e | 2063 | |
22efcab7 AC |
2064 | if Ekind (Typ) = E_Incomplete_Type then |
2065 | if not From_Limited_With (Typ) | |
2066 | and then No (Full_View (Typ)) | |
c0985d4e | 2067 | then |
22efcab7 AC |
2068 | Error_Attr_P |
2069 | ("prefix of % attribute cannot be an incomplete type"); | |
d8db0bca | 2070 | |
22efcab7 AC |
2071 | -- The limited view may be available indirectly through |
2072 | -- an intermediate unit. If the non-limited view is available | |
2073 | -- the attribute reference is legal. | |
2074 | ||
2075 | elsif From_Limited_With (Typ) | |
2076 | and then | |
2077 | (No (Non_Limited_View (Typ)) | |
2078 | or else Is_Incomplete_Type (Non_Limited_View (Typ))) | |
d8db0bca | 2079 | then |
822033eb HK |
2080 | Error_Attr_P |
2081 | ("prefix of % attribute cannot be an incomplete type"); | |
d8db0bca JM |
2082 | end if; |
2083 | end if; | |
22efcab7 AC |
2084 | |
2085 | -- Ada 2012 : formals in bodies may be incomplete, but no attribute | |
2086 | -- legally applies. | |
2087 | ||
2088 | elsif Is_Entity_Name (P) | |
2089 | and then Is_Formal (Entity (P)) | |
2090 | and then Is_Incomplete_Type (Etype (Etype (P))) | |
2091 | then | |
2092 | Error_Attr_P | |
2093 | ("prefix of % attribute cannot be an incomplete type"); | |
d8db0bca JM |
2094 | end if; |
2095 | ||
996ae0b0 RK |
2096 | if not Is_Entity_Name (P) |
2097 | or else not Is_Type (Entity (P)) | |
21d27997 | 2098 | or else In_Spec_Expression |
996ae0b0 RK |
2099 | then |
2100 | return; | |
996ae0b0 RK |
2101 | else |
2102 | Check_Fully_Declared (P_Type, P); | |
2103 | end if; | |
2104 | end Check_Not_Incomplete_Type; | |
2105 | ||
2106 | ---------------------------- | |
2107 | -- Check_Object_Reference -- | |
2108 | ---------------------------- | |
2109 | ||
2110 | procedure Check_Object_Reference (P : Node_Id) is | |
2111 | Rtyp : Entity_Id; | |
2112 | ||
2113 | begin | |
2114 | -- If we need an object, and we have a prefix that is the name of | |
2115 | -- a function entity, convert it into a function call. | |
2116 | ||
2117 | if Is_Entity_Name (P) | |
2118 | and then Ekind (Entity (P)) = E_Function | |
2119 | then | |
2120 | Rtyp := Etype (Entity (P)); | |
2121 | ||
2122 | Rewrite (P, | |
2123 | Make_Function_Call (Sloc (P), | |
2124 | Name => Relocate_Node (P))); | |
2125 | ||
2126 | Analyze_And_Resolve (P, Rtyp); | |
2127 | ||
2128 | -- Otherwise we must have an object reference | |
2129 | ||
2130 | elsif not Is_Object_Reference (P) then | |
822033eb | 2131 | Error_Attr_P ("prefix of % attribute must be object"); |
996ae0b0 RK |
2132 | end if; |
2133 | end Check_Object_Reference; | |
2134 | ||
54838d1f AC |
2135 | ---------------------------- |
2136 | -- Check_PolyORB_Attribute -- | |
2137 | ---------------------------- | |
2138 | ||
2139 | procedure Check_PolyORB_Attribute is | |
2140 | begin | |
2141 | Validate_Non_Static_Attribute_Function_Call; | |
2142 | ||
2143 | Check_Type; | |
2144 | Check_Not_CPP_Type; | |
2145 | ||
2146 | if Get_PCS_Name /= Name_PolyORB_DSA then | |
2147 | Error_Attr | |
2148 | ("attribute% requires the 'Poly'O'R'B 'P'C'S", N); | |
2149 | end if; | |
2150 | end Check_PolyORB_Attribute; | |
2151 | ||
996ae0b0 RK |
2152 | ------------------------ |
2153 | -- Check_Program_Unit -- | |
2154 | ------------------------ | |
2155 | ||
2156 | procedure Check_Program_Unit is | |
2157 | begin | |
2158 | if Is_Entity_Name (P) then | |
2159 | declare | |
2160 | K : constant Entity_Kind := Ekind (Entity (P)); | |
2161 | T : constant Entity_Id := Etype (Entity (P)); | |
2162 | ||
2163 | begin | |
2164 | if K in Subprogram_Kind | |
2165 | or else K in Task_Kind | |
2166 | or else K in Protected_Kind | |
2167 | or else K = E_Package | |
2168 | or else K in Generic_Unit_Kind | |
2169 | or else (K = E_Variable | |
2170 | and then | |
2171 | (Is_Task_Type (T) | |
2172 | or else | |
2173 | Is_Protected_Type (T))) | |
2174 | then | |
2175 | return; | |
2176 | end if; | |
2177 | end; | |
2178 | end if; | |
2179 | ||
822033eb | 2180 | Error_Attr_P ("prefix of % attribute must be program unit"); |
996ae0b0 RK |
2181 | end Check_Program_Unit; |
2182 | ||
2183 | --------------------- | |
2184 | -- Check_Real_Type -- | |
2185 | --------------------- | |
2186 | ||
2187 | procedure Check_Real_Type is | |
2188 | begin | |
2189 | Check_Type; | |
2190 | ||
2191 | if not Is_Real_Type (P_Type) then | |
822033eb | 2192 | Error_Attr_P ("prefix of % attribute must be real type"); |
996ae0b0 RK |
2193 | end if; |
2194 | end Check_Real_Type; | |
2195 | ||
2196 | ----------------------- | |
2197 | -- Check_Scalar_Type -- | |
2198 | ----------------------- | |
2199 | ||
2200 | procedure Check_Scalar_Type is | |
2201 | begin | |
2202 | Check_Type; | |
2203 | ||
2204 | if not Is_Scalar_Type (P_Type) then | |
822033eb | 2205 | Error_Attr_P ("prefix of % attribute must be scalar type"); |
996ae0b0 RK |
2206 | end if; |
2207 | end Check_Scalar_Type; | |
2208 | ||
e917aec2 | 2209 | ------------------------------------------ |
ce5ba43a | 2210 | -- Check_SPARK_05_Restriction_On_Attribute -- |
e917aec2 RD |
2211 | ------------------------------------------ |
2212 | ||
ce5ba43a | 2213 | procedure Check_SPARK_05_Restriction_On_Attribute is |
e917aec2 RD |
2214 | begin |
2215 | Error_Msg_Name_1 := Aname; | |
ce5ba43a AC |
2216 | Check_SPARK_05_Restriction ("attribute % is not allowed", P); |
2217 | end Check_SPARK_05_Restriction_On_Attribute; | |
e917aec2 | 2218 | |
996ae0b0 RK |
2219 | --------------------------- |
2220 | -- Check_Standard_Prefix -- | |
2221 | --------------------------- | |
2222 | ||
2223 | procedure Check_Standard_Prefix is | |
2224 | begin | |
2225 | Check_E0; | |
2226 | ||
2cbac6c6 | 2227 | if Nkind (P) /= N_Identifier or else Chars (P) /= Name_Standard then |
996ae0b0 RK |
2228 | Error_Attr ("only allowed prefix for % attribute is Standard", P); |
2229 | end if; | |
996ae0b0 RK |
2230 | end Check_Standard_Prefix; |
2231 | ||
2232 | ---------------------------- | |
2233 | -- Check_Stream_Attribute -- | |
2234 | ---------------------------- | |
2235 | ||
fbf5a39b | 2236 | procedure Check_Stream_Attribute (Nam : TSS_Name_Type) is |
996ae0b0 RK |
2237 | Etyp : Entity_Id; |
2238 | Btyp : Entity_Id; | |
468c6c8a | 2239 | |
7052f54e | 2240 | In_Shared_Var_Procs : Boolean; |
2cbac6c6 AC |
2241 | -- True when compiling System.Shared_Storage.Shared_Var_Procs body. |
2242 | -- For this runtime package (always compiled in GNAT mode), we allow | |
2243 | -- stream attributes references for limited types for the case where | |
2244 | -- shared passive objects are implemented using stream attributes, | |
2245 | -- which is the default in GNAT's persistent storage implementation. | |
7052f54e | 2246 | |
996ae0b0 RK |
2247 | begin |
2248 | Validate_Non_Static_Attribute_Function_Call; | |
2249 | ||
2250 | -- With the exception of 'Input, Stream attributes are procedures, | |
2251 | -- and can only appear at the position of procedure calls. We check | |
2252 | -- for this here, before they are rewritten, to give a more precise | |
2253 | -- diagnostic. | |
2254 | ||
fbf5a39b | 2255 | if Nam = TSS_Stream_Input then |
996ae0b0 RK |
2256 | null; |
2257 | ||
2258 | elsif Is_List_Member (N) | |
e10dab7f JM |
2259 | and then not Nkind_In (Parent (N), N_Procedure_Call_Statement, |
2260 | N_Aggregate) | |
996ae0b0 RK |
2261 | then |
2262 | null; | |
2263 | ||
2264 | else | |
2265 | Error_Attr | |
fbf5a39b | 2266 | ("invalid context for attribute%, which is a procedure", N); |
996ae0b0 RK |
2267 | end if; |
2268 | ||
2269 | Check_Type; | |
2270 | Btyp := Implementation_Base_Type (P_Type); | |
2271 | ||
2272 | -- Stream attributes not allowed on limited types unless the | |
d2d3604c TQ |
2273 | -- attribute reference was generated by the expander (in which |
2274 | -- case the underlying type will be used, as described in Sinfo), | |
2275 | -- or the attribute was specified explicitly for the type itself | |
edd63e9b ES |
2276 | -- or one of its ancestors (taking visibility rules into account if |
2277 | -- in Ada 2005 mode), or a pragma Stream_Convert applies to Btyp | |
2278 | -- (with no visibility restriction). | |
996ae0b0 | 2279 | |
7052f54e KP |
2280 | declare |
2281 | Gen_Body : constant Node_Id := Enclosing_Generic_Body (N); | |
2282 | begin | |
2283 | if Present (Gen_Body) then | |
2284 | In_Shared_Var_Procs := | |
2285 | Is_RTE (Corresponding_Spec (Gen_Body), RE_Shared_Var_Procs); | |
2286 | else | |
2287 | In_Shared_Var_Procs := False; | |
2288 | end if; | |
2289 | end; | |
2290 | ||
2291 | if (Comes_From_Source (N) | |
2292 | and then not (In_Shared_Var_Procs or In_Instance)) | |
edd63e9b | 2293 | and then not Stream_Attribute_Available (P_Type, Nam) |
1d571f3b | 2294 | and then not Has_Rep_Pragma (Btyp, Name_Stream_Convert) |
996ae0b0 | 2295 | then |
fbf5a39b | 2296 | Error_Msg_Name_1 := Aname; |
edd63e9b ES |
2297 | |
2298 | if Is_Limited_Type (P_Type) then | |
2299 | Error_Msg_NE | |
2300 | ("limited type& has no% attribute", P, P_Type); | |
2301 | Explain_Limited_Type (P_Type, P); | |
2302 | else | |
2303 | Error_Msg_NE | |
2304 | ("attribute% for type& is not available", P, P_Type); | |
2305 | end if; | |
fbf5a39b | 2306 | end if; |
996ae0b0 | 2307 | |
49d41397 RD |
2308 | -- Check for no stream operations allowed from No_Tagged_Streams |
2309 | ||
2310 | if Is_Tagged_Type (P_Type) | |
2311 | and then Present (No_Tagged_Streams_Pragma (P_Type)) | |
2312 | then | |
2313 | Error_Msg_Sloc := Sloc (No_Tagged_Streams_Pragma (P_Type)); | |
2314 | Error_Msg_NE | |
2315 | ("no stream operations for & (No_Tagged_Streams #)", N, P_Type); | |
2316 | return; | |
2317 | end if; | |
2318 | ||
95b89f1b AC |
2319 | -- Check restriction violations |
2320 | ||
93bcda23 AC |
2321 | -- First check the No_Streams restriction, which prohibits the use |
2322 | -- of explicit stream attributes in the source program. We do not | |
2323 | -- prevent the occurrence of stream attributes in generated code, | |
2324 | -- for instance those generated implicitly for dispatching purposes. | |
2325 | ||
2326 | if Comes_From_Source (N) then | |
2327 | Check_Restriction (No_Streams, P); | |
2328 | end if; | |
2329 | ||
276e7ed0 AC |
2330 | -- AI05-0057: if restriction No_Default_Stream_Attributes is active, |
2331 | -- it is illegal to use a predefined elementary type stream attribute | |
2332 | -- either by itself, or more importantly as part of the attribute | |
beaa97ab AC |
2333 | -- subprogram for a composite type. However, if the broader |
2334 | -- restriction No_Streams is active, stream operations are not | |
2335 | -- generated, and there is no error. | |
276e7ed0 | 2336 | |
beaa97ab AC |
2337 | if Restriction_Active (No_Default_Stream_Attributes) |
2338 | and then not Restriction_Active (No_Streams) | |
2339 | then | |
276e7ed0 AC |
2340 | declare |
2341 | T : Entity_Id; | |
9aff36e9 | 2342 | |
276e7ed0 AC |
2343 | begin |
2344 | if Nam = TSS_Stream_Input | |
9aff36e9 RD |
2345 | or else |
2346 | Nam = TSS_Stream_Read | |
276e7ed0 AC |
2347 | then |
2348 | T := | |
2349 | Type_Without_Stream_Operation (P_Type, TSS_Stream_Read); | |
2350 | else | |
2351 | T := | |
2352 | Type_Without_Stream_Operation (P_Type, TSS_Stream_Write); | |
2353 | end if; | |
2354 | ||
2355 | if Present (T) then | |
2356 | Check_Restriction (No_Default_Stream_Attributes, N); | |
2357 | ||
2358 | Error_Msg_NE | |
2359 | ("missing user-defined Stream Read or Write for type&", | |
2360 | N, T); | |
2361 | if not Is_Elementary_Type (P_Type) then | |
2362 | Error_Msg_NE | |
2363 | ("\which is a component of type&", N, P_Type); | |
2364 | end if; | |
2365 | end if; | |
2366 | end; | |
2367 | end if; | |
2368 | ||
93bcda23 | 2369 | -- Check special case of Exception_Id and Exception_Occurrence which |
308e6f3a | 2370 | -- are not allowed for restriction No_Exception_Registration. |
fbf5a39b | 2371 | |
273adcdf AC |
2372 | if Restriction_Check_Required (No_Exception_Registration) |
2373 | and then (Is_RTE (P_Type, RE_Exception_Id) | |
2374 | or else | |
2375 | Is_RTE (P_Type, RE_Exception_Occurrence)) | |
fbf5a39b AC |
2376 | then |
2377 | Check_Restriction (No_Exception_Registration, P); | |
996ae0b0 RK |
2378 | end if; |
2379 | ||
2380 | -- Here we must check that the first argument is an access type | |
2381 | -- that is compatible with Ada.Streams.Root_Stream_Type'Class. | |
2382 | ||
2383 | Analyze_And_Resolve (E1); | |
2384 | Etyp := Etype (E1); | |
2385 | ||
2386 | -- Note: the double call to Root_Type here is needed because the | |
2387 | -- root type of a class-wide type is the corresponding type (e.g. | |
fea9e956 | 2388 | -- X for X'Class, and we really want to go to the root.) |
996ae0b0 RK |
2389 | |
2390 | if not Is_Access_Type (Etyp) | |
2391 | or else Root_Type (Root_Type (Designated_Type (Etyp))) /= | |
2392 | RTE (RE_Root_Stream_Type) | |
2393 | then | |
2394 | Error_Attr | |
2395 | ("expected access to Ada.Streams.Root_Stream_Type''Class", E1); | |
2396 | end if; | |
2397 | ||
2398 | -- Check that the second argument is of the right type if there is | |
2399 | -- one (the Input attribute has only one argument so this is skipped) | |
2400 | ||
2401 | if Present (E2) then | |
2402 | Analyze (E2); | |
2403 | ||
fbf5a39b | 2404 | if Nam = TSS_Stream_Read |
996ae0b0 RK |
2405 | and then not Is_OK_Variable_For_Out_Formal (E2) |
2406 | then | |
2407 | Error_Attr | |
2408 | ("second argument of % attribute must be a variable", E2); | |
2409 | end if; | |
2410 | ||
2411 | Resolve (E2, P_Type); | |
2412 | end if; | |
21d27997 RD |
2413 | |
2414 | Check_Not_CPP_Type; | |
996ae0b0 RK |
2415 | end Check_Stream_Attribute; |
2416 | ||
f7ea2603 RD |
2417 | ------------------------- |
2418 | -- Check_System_Prefix -- | |
2419 | ------------------------- | |
2420 | ||
2421 | procedure Check_System_Prefix is | |
2422 | begin | |
2423 | if Nkind (P) /= N_Identifier or else Chars (P) /= Name_System then | |
2424 | Error_Attr ("only allowed prefix for % attribute is System", P); | |
2425 | end if; | |
2426 | end Check_System_Prefix; | |
2427 | ||
996ae0b0 RK |
2428 | ----------------------- |
2429 | -- Check_Task_Prefix -- | |
2430 | ----------------------- | |
2431 | ||
2432 | procedure Check_Task_Prefix is | |
2433 | begin | |
2434 | Analyze (P); | |
2435 | ||
65f01153 RD |
2436 | -- Ada 2005 (AI-345): Attribute 'Terminated can be applied to |
2437 | -- task interface class-wide types. | |
2438 | ||
996ae0b0 RK |
2439 | if Is_Task_Type (Etype (P)) |
2440 | or else (Is_Access_Type (Etype (P)) | |
65f01153 | 2441 | and then Is_Task_Type (Designated_Type (Etype (P)))) |
0791fbe9 | 2442 | or else (Ada_Version >= Ada_2005 |
65f01153 RD |
2443 | and then Ekind (Etype (P)) = E_Class_Wide_Type |
2444 | and then Is_Interface (Etype (P)) | |
2445 | and then Is_Task_Interface (Etype (P))) | |
996ae0b0 | 2446 | then |
fbf5a39b | 2447 | Resolve (P); |
65f01153 | 2448 | |
996ae0b0 | 2449 | else |
0791fbe9 | 2450 | if Ada_Version >= Ada_2005 then |
822033eb HK |
2451 | Error_Attr_P |
2452 | ("prefix of % attribute must be a task or a task " & | |
2453 | "interface class-wide object"); | |
65f01153 RD |
2454 | |
2455 | else | |
822033eb | 2456 | Error_Attr_P ("prefix of % attribute must be a task"); |
65f01153 | 2457 | end if; |
996ae0b0 RK |
2458 | end if; |
2459 | end Check_Task_Prefix; | |
2460 | ||
2461 | ---------------- | |
2462 | -- Check_Type -- | |
2463 | ---------------- | |
2464 | ||
2465 | -- The possibilities are an entity name denoting a type, or an | |
2466 | -- attribute reference that denotes a type (Base or Class). If | |
2467 | -- the type is incomplete, replace it with its full view. | |
2468 | ||
2469 | procedure Check_Type is | |
2470 | begin | |
2471 | if not Is_Entity_Name (P) | |
2472 | or else not Is_Type (Entity (P)) | |
2473 | then | |
822033eb | 2474 | Error_Attr_P ("prefix of % attribute must be a type"); |
996ae0b0 | 2475 | |
2d14501c ST |
2476 | elsif Is_Protected_Self_Reference (P) then |
2477 | Error_Attr_P | |
ae8c7d87 RD |
2478 | ("prefix of % attribute denotes current instance " |
2479 | & "(RM 9.4(21/2))"); | |
2d14501c | 2480 | |
996ae0b0 RK |
2481 | elsif Ekind (Entity (P)) = E_Incomplete_Type |
2482 | and then Present (Full_View (Entity (P))) | |
2483 | then | |
2484 | P_Type := Full_View (Entity (P)); | |
2485 | Set_Entity (P, P_Type); | |
2486 | end if; | |
2487 | end Check_Type; | |
2488 | ||
2489 | --------------------- | |
2490 | -- Check_Unit_Name -- | |
2491 | --------------------- | |
2492 | ||
2493 | procedure Check_Unit_Name (Nod : Node_Id) is | |
2494 | begin | |
2495 | if Nkind (Nod) = N_Identifier then | |
2496 | return; | |
2497 | ||
2c1b72d7 | 2498 | elsif Nkind_In (Nod, N_Selected_Component, N_Expanded_Name) then |
996ae0b0 RK |
2499 | Check_Unit_Name (Prefix (Nod)); |
2500 | ||
2501 | if Nkind (Selector_Name (Nod)) = N_Identifier then | |
2502 | return; | |
2503 | end if; | |
2504 | end if; | |
2505 | ||
2506 | Error_Attr ("argument for % attribute must be unit name", P); | |
2507 | end Check_Unit_Name; | |
2508 | ||
2509 | ---------------- | |
2510 | -- Error_Attr -- | |
2511 | ---------------- | |
2512 | ||
fbf5a39b | 2513 | procedure Error_Attr is |
996ae0b0 | 2514 | begin |
996ae0b0 RK |
2515 | Set_Etype (N, Any_Type); |
2516 | Set_Entity (N, Any_Type); | |
2517 | raise Bad_Attribute; | |
2518 | end Error_Attr; | |
2519 | ||
fbf5a39b AC |
2520 | procedure Error_Attr (Msg : String; Error_Node : Node_Id) is |
2521 | begin | |
2522 | Error_Msg_Name_1 := Aname; | |
2523 | Error_Msg_N (Msg, Error_Node); | |
2524 | Error_Attr; | |
2525 | end Error_Attr; | |
2526 | ||
822033eb HK |
2527 | ------------------ |
2528 | -- Error_Attr_P -- | |
2529 | ------------------ | |
2530 | ||
2531 | procedure Error_Attr_P (Msg : String) is | |
2532 | begin | |
2533 | Error_Msg_Name_1 := Aname; | |
2534 | Error_Msg_F (Msg, P); | |
2535 | Error_Attr; | |
2536 | end Error_Attr_P; | |
2537 | ||
996ae0b0 RK |
2538 | ---------------------------- |
2539 | -- Legal_Formal_Attribute -- | |
2540 | ---------------------------- | |
2541 | ||
2542 | procedure Legal_Formal_Attribute is | |
2543 | begin | |
2544 | Check_E0; | |
2545 | ||
2546 | if not Is_Entity_Name (P) | |
2547 | or else not Is_Type (Entity (P)) | |
2548 | then | |
822033eb | 2549 | Error_Attr_P ("prefix of % attribute must be generic type"); |
996ae0b0 RK |
2550 | |
2551 | elsif Is_Generic_Actual_Type (Entity (P)) | |
efdfd311 AC |
2552 | or else In_Instance |
2553 | or else In_Inlined_Body | |
996ae0b0 RK |
2554 | then |
2555 | null; | |
2556 | ||
2557 | elsif Is_Generic_Type (Entity (P)) then | |
83496138 | 2558 | if Is_Definite_Subtype (Entity (P)) then |
822033eb HK |
2559 | Error_Attr_P |
2560 | ("prefix of % attribute must be indefinite generic type"); | |
996ae0b0 RK |
2561 | end if; |
2562 | ||
2563 | else | |
822033eb HK |
2564 | Error_Attr_P |
2565 | ("prefix of % attribute must be indefinite generic type"); | |
996ae0b0 RK |
2566 | end if; |
2567 | ||
2568 | Set_Etype (N, Standard_Boolean); | |
2569 | end Legal_Formal_Attribute; | |
2570 | ||
85d6bf87 AC |
2571 | --------------------------------------------------------------- |
2572 | -- Max_Alignment_For_Allocation_Max_Size_In_Storage_Elements -- | |
2573 | --------------------------------------------------------------- | |
2574 | ||
2575 | procedure Max_Alignment_For_Allocation_Max_Size_In_Storage_Elements is | |
2576 | begin | |
2577 | Check_E0; | |
2578 | Check_Type; | |
2579 | Check_Not_Incomplete_Type; | |
2580 | Set_Etype (N, Universal_Integer); | |
2581 | end Max_Alignment_For_Allocation_Max_Size_In_Storage_Elements; | |
2582 | ||
2583 | ------------- | |
2584 | -- Min_Max -- | |
2585 | ------------- | |
2586 | ||
2587 | procedure Min_Max is | |
2588 | begin | |
2589 | Check_E2; | |
2590 | Check_Scalar_Type; | |
2591 | Resolve (E1, P_Base_Type); | |
2592 | Resolve (E2, P_Base_Type); | |
2593 | Set_Etype (N, P_Base_Type); | |
2594 | ||
2595 | -- Check for comparison on unordered enumeration type | |
2596 | ||
2597 | if Bad_Unordered_Enumeration_Reference (N, P_Base_Type) then | |
2598 | Error_Msg_Sloc := Sloc (P_Base_Type); | |
2599 | Error_Msg_NE | |
2600 | ("comparison on unordered enumeration type& declared#?U?", | |
2601 | N, P_Base_Type); | |
2602 | end if; | |
2603 | end Min_Max; | |
2604 | ||
996ae0b0 RK |
2605 | ------------------------ |
2606 | -- Standard_Attribute -- | |
2607 | ------------------------ | |
2608 | ||
2609 | procedure Standard_Attribute (Val : Int) is | |
2610 | begin | |
2611 | Check_Standard_Prefix; | |
fbf5a39b | 2612 | Rewrite (N, Make_Integer_Literal (Loc, Val)); |
996ae0b0 | 2613 | Analyze (N); |
edab6088 | 2614 | Set_Is_Static_Expression (N, True); |
996ae0b0 RK |
2615 | end Standard_Attribute; |
2616 | ||
96e90ac1 RD |
2617 | -------------------- |
2618 | -- Uneval_Old_Msg -- | |
2619 | -------------------- | |
2620 | ||
2621 | procedure Uneval_Old_Msg is | |
effdbb7d | 2622 | Uneval_Old_Setting : Character; |
1773d80b AC |
2623 | Prag : Node_Id; |
2624 | ||
96e90ac1 | 2625 | begin |
1773d80b AC |
2626 | -- If from aspect, then Uneval_Old_Setting comes from flags in the |
2627 | -- N_Aspect_Specification node that corresponds to the attribute. | |
2628 | ||
2629 | -- First find the pragma in which we appear (note that at this stage, | |
2630 | -- even if we appeared originally within an aspect specification, we | |
2631 | -- are now within the corresponding pragma). | |
2632 | ||
2633 | Prag := N; | |
2634 | loop | |
2635 | Prag := Parent (Prag); | |
2636 | exit when No (Prag) or else Nkind (Prag) = N_Pragma; | |
2637 | end loop; | |
2638 | ||
effdbb7d AC |
2639 | if Present (Prag) then |
2640 | if Uneval_Old_Accept (Prag) then | |
1773d80b | 2641 | Uneval_Old_Setting := 'A'; |
effdbb7d | 2642 | elsif Uneval_Old_Warn (Prag) then |
1773d80b AC |
2643 | Uneval_Old_Setting := 'W'; |
2644 | else | |
2645 | Uneval_Old_Setting := 'E'; | |
2646 | end if; | |
effdbb7d AC |
2647 | |
2648 | -- If we did not find the pragma, that's odd, just use the setting | |
2649 | -- from Opt.Uneval_Old. Perhaps this is due to a previous error? | |
2650 | ||
2651 | else | |
2652 | Uneval_Old_Setting := Opt.Uneval_Old; | |
1773d80b AC |
2653 | end if; |
2654 | ||
2655 | -- Processing depends on the setting of Uneval_Old | |
2656 | ||
2657 | case Uneval_Old_Setting is | |
96e90ac1 RD |
2658 | when 'E' => |
2659 | Error_Attr_P | |
2660 | ("prefix of attribute % that is potentially " | |
2661 | & "unevaluated must denote an entity"); | |
2662 | ||
2663 | when 'W' => | |
b8b2d982 AC |
2664 | Error_Msg_Name_1 := Aname; |
2665 | Error_Msg_F | |
96e90ac1 | 2666 | ("??prefix of attribute % appears in potentially " |
b8b2d982 | 2667 | & "unevaluated context, exception may be raised", P); |
96e90ac1 RD |
2668 | |
2669 | when 'A' => | |
2670 | null; | |
2671 | ||
2672 | when others => | |
2673 | raise Program_Error; | |
2674 | end case; | |
2675 | end Uneval_Old_Msg; | |
2676 | ||
996ae0b0 RK |
2677 | ------------------------- |
2678 | -- Unexpected Argument -- | |
2679 | ------------------------- | |
2680 | ||
2681 | procedure Unexpected_Argument (En : Node_Id) is | |
2682 | begin | |
2683 | Error_Attr ("unexpected argument for % attribute", En); | |
2684 | end Unexpected_Argument; | |
2685 | ||
2686 | ------------------------------------------------- | |
2687 | -- Validate_Non_Static_Attribute_Function_Call -- | |
2688 | ------------------------------------------------- | |
2689 | ||
2690 | -- This function should be moved to Sem_Dist ??? | |
2691 | ||
2692 | procedure Validate_Non_Static_Attribute_Function_Call is | |
2693 | begin | |
2694 | if In_Preelaborated_Unit | |
2695 | and then not In_Subprogram_Or_Concurrent_Unit | |
2696 | then | |
fbf5a39b AC |
2697 | Flag_Non_Static_Expr |
2698 | ("non-static function call in preelaborated unit!", N); | |
996ae0b0 RK |
2699 | end if; |
2700 | end Validate_Non_Static_Attribute_Function_Call; | |
2701 | ||
cb3d8731 | 2702 | -- Start of processing for Analyze_Attribute |
996ae0b0 RK |
2703 | |
2704 | begin | |
58ba2415 HK |
2705 | -- Immediate return if unrecognized attribute (already diagnosed by |
2706 | -- parser, so there is nothing more that we need to do). | |
996ae0b0 RK |
2707 | |
2708 | if not Is_Attribute_Name (Aname) then | |
2709 | raise Bad_Attribute; | |
2710 | end if; | |
2711 | ||
58ba2415 HK |
2712 | Check_Restriction_No_Use_Of_Attribute (N); |
2713 | ||
822033eb | 2714 | -- Deal with Ada 83 issues |
996ae0b0 | 2715 | |
fbf5a39b AC |
2716 | if Comes_From_Source (N) then |
2717 | if not Attribute_83 (Attr_Id) then | |
0ab80019 | 2718 | if Ada_Version = Ada_83 and then Comes_From_Source (N) then |
fbf5a39b | 2719 | Error_Msg_Name_1 := Aname; |
324ac540 | 2720 | Error_Msg_N ("(Ada 83) attribute% is not standard??", N); |
fbf5a39b | 2721 | end if; |
996ae0b0 | 2722 | |
fbf5a39b AC |
2723 | if Attribute_Impl_Def (Attr_Id) then |
2724 | Check_Restriction (No_Implementation_Attributes, N); | |
2725 | end if; | |
996ae0b0 RK |
2726 | end if; |
2727 | end if; | |
2728 | ||
edab6088 | 2729 | -- Deal with Ada 2005 attributes that are implementation attributes |
155562cb AC |
2730 | -- because they appear in a version of Ada before Ada 2005, and |
2731 | -- similarly for Ada 2012 attributes appearing in an earlier version. | |
822033eb | 2732 | |
155562cb AC |
2733 | if (Attribute_05 (Attr_Id) and then Ada_Version < Ada_2005) |
2734 | or else | |
2735 | (Attribute_12 (Attr_Id) and then Ada_Version < Ada_2012) | |
2736 | then | |
822033eb HK |
2737 | Check_Restriction (No_Implementation_Attributes, N); |
2738 | end if; | |
2739 | ||
996ae0b0 RK |
2740 | -- Remote access to subprogram type access attribute reference needs |
2741 | -- unanalyzed copy for tree transformation. The analyzed copy is used | |
2742 | -- for its semantic information (whether prefix is a remote subprogram | |
2743 | -- name), the unanalyzed copy is used to construct new subtree rooted | |
f529bac5 | 2744 | -- with N_Aggregate which represents a fat pointer aggregate. |
996ae0b0 RK |
2745 | |
2746 | if Aname = Name_Access then | |
fbf5a39b | 2747 | Discard_Node (Copy_Separate_Tree (N)); |
996ae0b0 RK |
2748 | end if; |
2749 | ||
2750 | -- Analyze prefix and exit if error in analysis. If the prefix is an | |
442ade9d RD |
2751 | -- incomplete type, use full view if available. Note that there are |
2752 | -- some attributes for which we do not analyze the prefix, since the | |
d2b4b3da | 2753 | -- prefix is not a normal name, or else needs special handling. |
996ae0b0 | 2754 | |
2cbac6c6 AC |
2755 | if Aname /= Name_Elab_Body and then |
2756 | Aname /= Name_Elab_Spec and then | |
2757 | Aname /= Name_Elab_Subp_Body and then | |
2cbac6c6 | 2758 | Aname /= Name_Enabled and then |
d2b4b3da | 2759 | Aname /= Name_Old |
996ae0b0 RK |
2760 | then |
2761 | Analyze (P); | |
2762 | P_Type := Etype (P); | |
2763 | ||
2764 | if Is_Entity_Name (P) | |
2765 | and then Present (Entity (P)) | |
2766 | and then Is_Type (Entity (P)) | |
996ae0b0 | 2767 | then |
b8dc622e JM |
2768 | if Ekind (Entity (P)) = E_Incomplete_Type then |
2769 | P_Type := Get_Full_View (P_Type); | |
2770 | Set_Entity (P, P_Type); | |
2771 | Set_Etype (P, P_Type); | |
2772 | ||
2773 | elsif Entity (P) = Current_Scope | |
2774 | and then Is_Record_Type (Entity (P)) | |
2775 | then | |
b8dc622e JM |
2776 | -- Use of current instance within the type. Verify that if the |
2777 | -- attribute appears within a constraint, it yields an access | |
2778 | -- type, other uses are illegal. | |
2779 | ||
2780 | declare | |
2781 | Par : Node_Id; | |
2782 | ||
2783 | begin | |
2784 | Par := Parent (N); | |
2785 | while Present (Par) | |
2786 | and then Nkind (Parent (Par)) /= N_Component_Definition | |
2787 | loop | |
2788 | Par := Parent (Par); | |
2789 | end loop; | |
2790 | ||
2791 | if Present (Par) | |
2792 | and then Nkind (Par) = N_Subtype_Indication | |
2793 | then | |
2794 | if Attr_Id /= Attribute_Access | |
2795 | and then Attr_Id /= Attribute_Unchecked_Access | |
2796 | and then Attr_Id /= Attribute_Unrestricted_Access | |
2797 | then | |
2798 | Error_Msg_N | |
21db8699 RD |
2799 | ("in a constraint the current instance can only " |
2800 | & "be used with an access attribute", N); | |
b8dc622e JM |
2801 | end if; |
2802 | end if; | |
2803 | end; | |
2804 | end if; | |
996ae0b0 RK |
2805 | end if; |
2806 | ||
2807 | if P_Type = Any_Type then | |
2808 | raise Bad_Attribute; | |
2809 | end if; | |
2810 | ||
2811 | P_Base_Type := Base_Type (P_Type); | |
996ae0b0 RK |
2812 | end if; |
2813 | ||
2814 | -- Analyze expressions that may be present, exiting if an error occurs | |
2815 | ||
2816 | if No (Exprs) then | |
2817 | E1 := Empty; | |
2818 | E2 := Empty; | |
2819 | ||
2820 | else | |
2821 | E1 := First (Exprs); | |
996ae0b0 | 2822 | |
2cbac6c6 AC |
2823 | -- Skip analysis for case of Restriction_Set, we do not expect |
2824 | -- the argument to be analyzed in this case. | |
457b6274 | 2825 | |
2cbac6c6 AC |
2826 | if Aname /= Name_Restriction_Set then |
2827 | Analyze (E1); | |
2828 | ||
2829 | -- Check for missing/bad expression (result of previous error) | |
2830 | ||
2831 | if No (E1) or else Etype (E1) = Any_Type then | |
2832 | raise Bad_Attribute; | |
2833 | end if; | |
996ae0b0 RK |
2834 | end if; |
2835 | ||
2836 | E2 := Next (E1); | |
2837 | ||
2838 | if Present (E2) then | |
2839 | Analyze (E2); | |
2840 | ||
2841 | if Etype (E2) = Any_Type then | |
2842 | raise Bad_Attribute; | |
2843 | end if; | |
2844 | ||
2845 | if Present (Next (E2)) then | |
2846 | Unexpected_Argument (Next (E2)); | |
2847 | end if; | |
2848 | end if; | |
2849 | end if; | |
2850 | ||
0083dd66 AC |
2851 | -- Cases where prefix must be resolvable by itself |
2852 | ||
446ebdbb | 2853 | if Is_Overloaded (P) |
edd63e9b ES |
2854 | and then Aname /= Name_Access |
2855 | and then Aname /= Name_Address | |
2856 | and then Aname /= Name_Code_Address | |
21d27997 | 2857 | and then Aname /= Name_Result |
edd63e9b ES |
2858 | and then Aname /= Name_Unchecked_Access |
2859 | then | |
890f1954 | 2860 | -- The prefix must be resolvable by itself, without reference to the |
446ebdbb AC |
2861 | -- attribute. One case that requires special handling is a prefix |
2862 | -- that is a function name, where one interpretation may be a | |
2863 | -- parameterless call. Entry attributes are handled specially below. | |
edd63e9b | 2864 | |
446ebdbb | 2865 | if Is_Entity_Name (P) |
ba0c6e47 | 2866 | and then not Nam_In (Aname, Name_Count, Name_Caller) |
edd63e9b | 2867 | then |
446ebdbb AC |
2868 | Check_Parameterless_Call (P); |
2869 | end if; | |
edd63e9b | 2870 | |
890f1954 | 2871 | if Is_Overloaded (P) then |
edd63e9b | 2872 | |
890f1954 | 2873 | -- Ada 2005 (AI-345): Since protected and task types have |
ba0c6e47 RD |
2874 | -- primitive entry wrappers, the attributes Count, and Caller |
2875 | -- require a context check | |
edd63e9b | 2876 | |
ba0c6e47 | 2877 | if Nam_In (Aname, Name_Count, Name_Caller) then |
890f1954 RD |
2878 | declare |
2879 | Count : Natural := 0; | |
2880 | I : Interp_Index; | |
2881 | It : Interp; | |
446ebdbb | 2882 | |
890f1954 RD |
2883 | begin |
2884 | Get_First_Interp (P, I, It); | |
2885 | while Present (It.Nam) loop | |
2886 | if Comes_From_Source (It.Nam) then | |
2887 | Count := Count + 1; | |
446ebdbb | 2888 | else |
890f1954 | 2889 | Remove_Interp (I); |
446ebdbb | 2890 | end if; |
edd63e9b | 2891 | |
890f1954 RD |
2892 | Get_Next_Interp (I, It); |
2893 | end loop; | |
2894 | ||
2895 | if Count > 1 then | |
2896 | Error_Attr ("ambiguous prefix for % attribute", P); | |
2897 | else | |
2898 | Set_Is_Overloaded (P, False); | |
2899 | end if; | |
2900 | end; | |
2901 | ||
2902 | else | |
2903 | Error_Attr ("ambiguous prefix for % attribute", P); | |
2904 | end if; | |
edd63e9b | 2905 | end if; |
996ae0b0 RK |
2906 | end if; |
2907 | ||
2ba431e5 YM |
2908 | -- In SPARK, attributes of private types are only allowed if the full |
2909 | -- type declaration is visible. | |
8ed68165 | 2910 | |
446ebdbb AC |
2911 | -- Note: the check for Present (Entity (P)) defends against some error |
2912 | -- conditions where the Entity field is not set. | |
2913 | ||
2914 | if Is_Entity_Name (P) and then Present (Entity (P)) | |
8ed68165 AC |
2915 | and then Is_Type (Entity (P)) |
2916 | and then Is_Private_Type (P_Type) | |
2917 | and then not In_Open_Scopes (Scope (P_Type)) | |
2918 | and then not In_Spec_Expression | |
2919 | then | |
ce5ba43a | 2920 | Check_SPARK_05_Restriction ("invisible attribute of type", N); |
8ed68165 AC |
2921 | end if; |
2922 | ||
996ae0b0 RK |
2923 | -- Remaining processing depends on attribute |
2924 | ||
2925 | case Attr_Id is | |
2926 | ||
de94a7e7 AC |
2927 | -- Attributes related to Ada 2012 iterators. Attribute specifications |
2928 | -- exist for these, but they cannot be queried. | |
2929 | ||
2930 | when Attribute_Constant_Indexing | | |
2931 | Attribute_Default_Iterator | | |
2932 | Attribute_Implicit_Dereference | | |
2933 | Attribute_Iterator_Element | | |
dd2bf554 | 2934 | Attribute_Iterable | |
de94a7e7 AC |
2935 | Attribute_Variable_Indexing => |
2936 | Error_Msg_N ("illegal attribute", N); | |
0da80d7d | 2937 | |
d27f3ff4 AC |
2938 | -- Internal attributes used to deal with Ada 2012 delayed aspects. These |
2939 | -- were already rejected by the parser. Thus they shouldn't appear here. | |
b98e2969 | 2940 | |
c1107fa3 | 2941 | when Internal_Attribute_Id => |
d48f3dca | 2942 | raise Program_Error; |
b98e2969 | 2943 | |
996ae0b0 RK |
2944 | ------------------ |
2945 | -- Abort_Signal -- | |
2946 | ------------------ | |
2947 | ||
2948 | when Attribute_Abort_Signal => | |
2949 | Check_Standard_Prefix; | |
e4494292 | 2950 | Rewrite (N, New_Occurrence_Of (Stand.Abort_Signal, Loc)); |
996ae0b0 RK |
2951 | Analyze (N); |
2952 | ||
2953 | ------------ | |
2954 | -- Access -- | |
2955 | ------------ | |
2956 | ||
2957 | when Attribute_Access => | |
fbf5a39b | 2958 | Analyze_Access_Attribute; |
22efcab7 | 2959 | Check_Not_Incomplete_Type; |
996ae0b0 RK |
2960 | |
2961 | ------------- | |
2962 | -- Address -- | |
2963 | ------------- | |
2964 | ||
2965 | when Attribute_Address => | |
2966 | Check_E0; | |
3cd4a210 | 2967 | Address_Checks; |
22efcab7 | 2968 | Check_Not_Incomplete_Type; |
996ae0b0 RK |
2969 | Set_Etype (N, RTE (RE_Address)); |
2970 | ||
2971 | ------------------ | |
2972 | -- Address_Size -- | |
2973 | ------------------ | |
2974 | ||
2975 | when Attribute_Address_Size => | |
2976 | Standard_Attribute (System_Address_Size); | |
2977 | ||
2978 | -------------- | |
2979 | -- Adjacent -- | |
2980 | -------------- | |
2981 | ||
2982 | when Attribute_Adjacent => | |
2983 | Check_Floating_Point_Type_2; | |
2984 | Set_Etype (N, P_Base_Type); | |
2985 | Resolve (E1, P_Base_Type); | |
2986 | Resolve (E2, P_Base_Type); | |
2987 | ||
2988 | --------- | |
2989 | -- Aft -- | |
2990 | --------- | |
2991 | ||
2992 | when Attribute_Aft => | |
2993 | Check_Fixed_Point_Type_0; | |
2994 | Set_Etype (N, Universal_Integer); | |
2995 | ||
2996 | --------------- | |
2997 | -- Alignment -- | |
2998 | --------------- | |
2999 | ||
3000 | when Attribute_Alignment => | |
3001 | ||
3002 | -- Don't we need more checking here, cf Size ??? | |
3003 | ||
3004 | Check_E0; | |
3005 | Check_Not_Incomplete_Type; | |
21d27997 | 3006 | Check_Not_CPP_Type; |
996ae0b0 RK |
3007 | Set_Etype (N, Universal_Integer); |
3008 | ||
3009 | --------------- | |
3010 | -- Asm_Input -- | |
3011 | --------------- | |
3012 | ||
3013 | when Attribute_Asm_Input => | |
3014 | Check_Asm_Attribute; | |
7e4680c1 EB |
3015 | |
3016 | -- The back-end may need to take the address of E2 | |
3017 | ||
3018 | if Is_Entity_Name (E2) then | |
3019 | Set_Address_Taken (Entity (E2)); | |
3020 | end if; | |
3021 | ||
996ae0b0 RK |
3022 | Set_Etype (N, RTE (RE_Asm_Input_Operand)); |
3023 | ||
3024 | ---------------- | |
3025 | -- Asm_Output -- | |
3026 | ---------------- | |
3027 | ||
3028 | when Attribute_Asm_Output => | |
3029 | Check_Asm_Attribute; | |
3030 | ||
3031 | if Etype (E2) = Any_Type then | |
3032 | return; | |
3033 | ||
3034 | elsif Aname = Name_Asm_Output then | |
3035 | if not Is_Variable (E2) then | |
3036 | Error_Attr | |
3037 | ("second argument for Asm_Output is not variable", E2); | |
3038 | end if; | |
3039 | end if; | |
3040 | ||
21d27997 | 3041 | Note_Possible_Modification (E2, Sure => True); |
7e4680c1 EB |
3042 | |
3043 | -- The back-end may need to take the address of E2 | |
3044 | ||
3045 | if Is_Entity_Name (E2) then | |
3046 | Set_Address_Taken (Entity (E2)); | |
3047 | end if; | |
3048 | ||
996ae0b0 RK |
3049 | Set_Etype (N, RTE (RE_Asm_Output_Operand)); |
3050 | ||
0ebc109a VP |
3051 | ----------------------------- |
3052 | -- Atomic_Always_Lock_Free -- | |
3053 | ----------------------------- | |
3054 | ||
3055 | when Attribute_Atomic_Always_Lock_Free => | |
3056 | Check_E0; | |
3057 | Check_Type; | |
3058 | Set_Etype (N, Standard_Boolean); | |
3059 | ||
996ae0b0 RK |
3060 | ---------- |
3061 | -- Base -- | |
3062 | ---------- | |
3063 | ||
fbf5a39b AC |
3064 | -- Note: when the base attribute appears in the context of a subtype |
3065 | -- mark, the analysis is done by Sem_Ch8.Find_Type, rather than by | |
3066 | -- the following circuit. | |
3067 | ||
996ae0b0 RK |
3068 | when Attribute_Base => Base : declare |
3069 | Typ : Entity_Id; | |
3070 | ||
3071 | begin | |
9c5a3a8d | 3072 | Check_E0; |
996ae0b0 RK |
3073 | Find_Type (P); |
3074 | Typ := Entity (P); | |
3075 | ||
0ab80019 | 3076 | if Ada_Version >= Ada_95 |
fbf5a39b AC |
3077 | and then not Is_Scalar_Type (Typ) |
3078 | and then not Is_Generic_Type (Typ) | |
3079 | then | |
822033eb | 3080 | Error_Attr_P ("prefix of Base attribute must be scalar type"); |
fbf5a39b AC |
3081 | |
3082 | elsif Sloc (Typ) = Standard_Location | |
996ae0b0 RK |
3083 | and then Base_Type (Typ) = Typ |
3084 | and then Warn_On_Redundant_Constructs | |
3085 | then | |
ed2233dc | 3086 | Error_Msg_NE -- CODEFIX |
324ac540 | 3087 | ("?r?redundant attribute, & is its own base type", N, Typ); |
996ae0b0 RK |
3088 | end if; |
3089 | ||
7a489a2b AC |
3090 | if Nkind (Parent (N)) /= N_Attribute_Reference then |
3091 | Error_Msg_Name_1 := Aname; | |
ce5ba43a | 3092 | Check_SPARK_05_Restriction |
7a489a2b AC |
3093 | ("attribute% is only allowed as prefix of another attribute", P); |
3094 | end if; | |
3095 | ||
996ae0b0 | 3096 | Set_Etype (N, Base_Type (Entity (P))); |
9c5a3a8d | 3097 | Set_Entity (N, Base_Type (Entity (P))); |
e4494292 | 3098 | Rewrite (N, New_Occurrence_Of (Entity (N), Loc)); |
9c5a3a8d | 3099 | Analyze (N); |
996ae0b0 RK |
3100 | end Base; |
3101 | ||
3102 | --------- | |
3103 | -- Bit -- | |
3104 | --------- | |
3105 | ||
3106 | when Attribute_Bit => Bit : | |
3107 | begin | |
3108 | Check_E0; | |
3109 | ||
3110 | if not Is_Object_Reference (P) then | |
822033eb | 3111 | Error_Attr_P ("prefix for % attribute must be object"); |
996ae0b0 RK |
3112 | |
3113 | -- What about the access object cases ??? | |
3114 | ||
3115 | else | |
3116 | null; | |
3117 | end if; | |
3118 | ||
3119 | Set_Etype (N, Universal_Integer); | |
3120 | end Bit; | |
3121 | ||
3122 | --------------- | |
3123 | -- Bit_Order -- | |
3124 | --------------- | |
3125 | ||
3126 | when Attribute_Bit_Order => Bit_Order : | |
3127 | begin | |
3128 | Check_E0; | |
3129 | Check_Type; | |
3130 | ||
3131 | if not Is_Record_Type (P_Type) then | |
822033eb | 3132 | Error_Attr_P ("prefix of % attribute must be record type"); |
996ae0b0 RK |
3133 | end if; |
3134 | ||
3135 | if Bytes_Big_Endian xor Reverse_Bit_Order (P_Type) then | |
3136 | Rewrite (N, | |
3137 | New_Occurrence_Of (RTE (RE_High_Order_First), Loc)); | |
3138 | else | |
3139 | Rewrite (N, | |
3140 | New_Occurrence_Of (RTE (RE_Low_Order_First), Loc)); | |
3141 | end if; | |
3142 | ||
3143 | Set_Etype (N, RTE (RE_Bit_Order)); | |
fbf5a39b | 3144 | Resolve (N); |
996ae0b0 RK |
3145 | |
3146 | -- Reset incorrect indication of staticness | |
3147 | ||
3148 | Set_Is_Static_Expression (N, False); | |
3149 | end Bit_Order; | |
3150 | ||
3151 | ------------------ | |
3152 | -- Bit_Position -- | |
3153 | ------------------ | |
3154 | ||
3155 | -- Note: in generated code, we can have a Bit_Position attribute | |
3156 | -- applied to a (naked) record component (i.e. the prefix is an | |
3157 | -- identifier that references an E_Component or E_Discriminant | |
3158 | -- entity directly, and this is interpreted as expected by Gigi. | |
3159 | -- The following code will not tolerate such usage, but when the | |
3160 | -- expander creates this special case, it marks it as analyzed | |
3161 | -- immediately and sets an appropriate type. | |
3162 | ||
3163 | when Attribute_Bit_Position => | |
996ae0b0 RK |
3164 | if Comes_From_Source (N) then |
3165 | Check_Component; | |
3166 | end if; | |
3167 | ||
3168 | Set_Etype (N, Universal_Integer); | |
3169 | ||
3170 | ------------------ | |
3171 | -- Body_Version -- | |
3172 | ------------------ | |
3173 | ||
3174 | when Attribute_Body_Version => | |
3175 | Check_E0; | |
3176 | Check_Program_Unit; | |
3177 | Set_Etype (N, RTE (RE_Version_String)); | |
3178 | ||
3179 | -------------- | |
3180 | -- Callable -- | |
3181 | -------------- | |
3182 | ||
3183 | when Attribute_Callable => | |
3184 | Check_E0; | |
3185 | Set_Etype (N, Standard_Boolean); | |
3186 | Check_Task_Prefix; | |
3187 | ||
3188 | ------------ | |
3189 | -- Caller -- | |
3190 | ------------ | |
3191 | ||
3192 | when Attribute_Caller => Caller : declare | |
3193 | Ent : Entity_Id; | |
3194 | S : Entity_Id; | |
3195 | ||
3196 | begin | |
3197 | Check_E0; | |
3198 | ||
e10dab7f | 3199 | if Nkind_In (P, N_Identifier, N_Expanded_Name) then |
996ae0b0 RK |
3200 | Ent := Entity (P); |
3201 | ||
3202 | if not Is_Entry (Ent) then | |
3203 | Error_Attr ("invalid entry name", N); | |
3204 | end if; | |
3205 | ||
3206 | else | |
3207 | Error_Attr ("invalid entry name", N); | |
3208 | return; | |
3209 | end if; | |
3210 | ||
3211 | for J in reverse 0 .. Scope_Stack.Last loop | |
3212 | S := Scope_Stack.Table (J).Entity; | |
3213 | ||
3214 | if S = Scope (Ent) then | |
3215 | Error_Attr ("Caller must appear in matching accept or body", N); | |
3216 | elsif S = Ent then | |
3217 | exit; | |
3218 | end if; | |
3219 | end loop; | |
3220 | ||
b5e792e2 | 3221 | Set_Etype (N, RTE (RO_AT_Task_Id)); |
996ae0b0 RK |
3222 | end Caller; |
3223 | ||
3224 | ------------- | |
3225 | -- Ceiling -- | |
3226 | ------------- | |
3227 | ||
3228 | when Attribute_Ceiling => | |
3229 | Check_Floating_Point_Type_1; | |
3230 | Set_Etype (N, P_Base_Type); | |
3231 | Resolve (E1, P_Base_Type); | |
3232 | ||
3233 | ----------- | |
3234 | -- Class -- | |
3235 | ----------- | |
3236 | ||
9c5a3a8d | 3237 | when Attribute_Class => |
996ae0b0 | 3238 | Check_Restriction (No_Dispatch, N); |
9c5a3a8d ST |
3239 | Check_E0; |
3240 | Find_Type (N); | |
996ae0b0 | 3241 | |
b5c739f9 RD |
3242 | -- Applying Class to untagged incomplete type is obsolescent in Ada |
3243 | -- 2005. Note that we can't test Is_Tagged_Type here on P_Type, since | |
3244 | -- this flag gets set by Find_Type in this situation. | |
3245 | ||
7a963087 | 3246 | if Restriction_Check_Required (No_Obsolescent_Features) |
b5c739f9 RD |
3247 | and then Ada_Version >= Ada_2005 |
3248 | and then Ekind (P_Type) = E_Incomplete_Type | |
3249 | then | |
3250 | declare | |
3251 | DN : constant Node_Id := Declaration_Node (P_Type); | |
3252 | begin | |
3253 | if Nkind (DN) = N_Incomplete_Type_Declaration | |
3254 | and then not Tagged_Present (DN) | |
3255 | then | |
3256 | Check_Restriction (No_Obsolescent_Features, P); | |
3257 | end if; | |
3258 | end; | |
3259 | end if; | |
3260 | ||
996ae0b0 RK |
3261 | ------------------ |
3262 | -- Code_Address -- | |
3263 | ------------------ | |
3264 | ||
3265 | when Attribute_Code_Address => | |
3266 | Check_E0; | |
3267 | ||
3268 | if Nkind (P) = N_Attribute_Reference | |
b69cd36a | 3269 | and then Nam_In (Attribute_Name (P), Name_Elab_Body, Name_Elab_Spec) |
996ae0b0 RK |
3270 | then |
3271 | null; | |
3272 | ||
3273 | elsif not Is_Entity_Name (P) | |
3274 | or else (Ekind (Entity (P)) /= E_Function | |
3275 | and then | |
3276 | Ekind (Entity (P)) /= E_Procedure) | |
3277 | then | |
3278 | Error_Attr ("invalid prefix for % attribute", P); | |
3279 | Set_Address_Taken (Entity (P)); | |
16212e89 GD |
3280 | |
3281 | -- Issue an error if the prefix denotes an eliminated subprogram | |
3282 | ||
3283 | else | |
3284 | Check_For_Eliminated_Subprogram (P, Entity (P)); | |
996ae0b0 RK |
3285 | end if; |
3286 | ||
3287 | Set_Etype (N, RTE (RE_Address)); | |
3288 | ||
e0bf7d65 RD |
3289 | ---------------------- |
3290 | -- Compiler_Version -- | |
3291 | ---------------------- | |
3292 | ||
3293 | when Attribute_Compiler_Version => | |
3294 | Check_E0; | |
3295 | Check_Standard_Prefix; | |
1f110335 | 3296 | Rewrite (N, Make_String_Literal (Loc, "GNAT " & Gnat_Version_String)); |
e0bf7d65 | 3297 | Analyze_And_Resolve (N, Standard_String); |
edab6088 | 3298 | Set_Is_Static_Expression (N, True); |
e0bf7d65 | 3299 | |
996ae0b0 RK |
3300 | -------------------- |
3301 | -- Component_Size -- | |
3302 | -------------------- | |
3303 | ||
3304 | when Attribute_Component_Size => | |
3305 | Check_E0; | |
3306 | Set_Etype (N, Universal_Integer); | |
3307 | ||
3308 | -- Note: unlike other array attributes, unconstrained arrays are OK | |
3309 | ||
3310 | if Is_Array_Type (P_Type) and then not Is_Constrained (P_Type) then | |
3311 | null; | |
3312 | else | |
3313 | Check_Array_Type; | |
3314 | end if; | |
3315 | ||
3316 | ------------- | |
3317 | -- Compose -- | |
3318 | ------------- | |
3319 | ||
3320 | when Attribute_Compose => | |
3321 | Check_Floating_Point_Type_2; | |
3322 | Set_Etype (N, P_Base_Type); | |
3323 | Resolve (E1, P_Base_Type); | |
3324 | Resolve (E2, Any_Integer); | |
3325 | ||
3326 | ----------------- | |
3327 | -- Constrained -- | |
3328 | ----------------- | |
3329 | ||
3330 | when Attribute_Constrained => | |
3331 | Check_E0; | |
3332 | Set_Etype (N, Standard_Boolean); | |
3333 | ||
3334 | -- Case from RM J.4(2) of constrained applied to private type | |
3335 | ||
3336 | if Is_Entity_Name (P) and then Is_Type (Entity (P)) then | |
b5c739f9 | 3337 | Check_Restriction (No_Obsolescent_Features, P); |
5f3ab6fb AC |
3338 | |
3339 | if Warn_On_Obsolescent_Feature then | |
3340 | Error_Msg_N | |
3341 | ("constrained for private type is an " & | |
324ac540 | 3342 | "obsolescent feature (RM J.4)?j?", N); |
5f3ab6fb | 3343 | end if; |
996ae0b0 RK |
3344 | |
3345 | -- If we are within an instance, the attribute must be legal | |
19f0526a AC |
3346 | -- because it was valid in the generic unit. Ditto if this is |
3347 | -- an inlining of a function declared in an instance. | |
996ae0b0 | 3348 | |
b80a2b4b | 3349 | if In_Instance or else In_Inlined_Body then |
996ae0b0 RK |
3350 | return; |
3351 | ||
3352 | -- For sure OK if we have a real private type itself, but must | |
3353 | -- be completed, cannot apply Constrained to incomplete type. | |
3354 | ||
3355 | elsif Is_Private_Type (Entity (P)) then | |
fbf5a39b AC |
3356 | |
3357 | -- Note: this is one of the Annex J features that does not | |
3358 | -- generate a warning from -gnatwj, since in fact it seems | |
3359 | -- very useful, and is used in the GNAT runtime. | |
3360 | ||
996ae0b0 RK |
3361 | Check_Not_Incomplete_Type; |
3362 | return; | |
3363 | end if; | |
3364 | ||
fbf5a39b AC |
3365 | -- Normal (non-obsolescent case) of application to object of |
3366 | -- a discriminated type. | |
3367 | ||
996ae0b0 RK |
3368 | else |
3369 | Check_Object_Reference (P); | |
3370 | ||
3371 | -- If N does not come from source, then we allow the | |
3372 | -- the attribute prefix to be of a private type whose | |
3373 | -- full type has discriminants. This occurs in cases | |
3374 | -- involving expanded calls to stream attributes. | |
3375 | ||
3376 | if not Comes_From_Source (N) then | |
3377 | P_Type := Underlying_Type (P_Type); | |
3378 | end if; | |
3379 | ||
3380 | -- Must have discriminants or be an access type designating | |
a6152428 | 3381 | -- a type with discriminants. If it is a classwide type it |
996ae0b0 RK |
3382 | -- has unknown discriminants. |
3383 | ||
3384 | if Has_Discriminants (P_Type) | |
a6152428 AC |
3385 | or else Has_Unknown_Discriminants (P_Type) |
3386 | or else | |
3387 | (Is_Access_Type (P_Type) | |
3388 | and then Has_Discriminants (Designated_Type (P_Type))) | |
996ae0b0 RK |
3389 | then |
3390 | return; | |
3391 | ||
a6152428 AC |
3392 | -- The rule given in 3.7.2 is part of static semantics, but the |
3393 | -- intent is clearly that it be treated as a legality rule, and | |
3394 | -- rechecked in the visible part of an instance. Nevertheless | |
3395 | -- the intent also seems to be it should legally apply to the | |
3396 | -- actual of a formal with unknown discriminants, regardless of | |
3397 | -- whether the actual has discriminants, in which case the value | |
3398 | -- of the attribute is determined using the J.4 rules. This choice | |
3399 | -- seems the most useful, and is compatible with existing tests. | |
3400 | ||
3401 | elsif In_Instance then | |
3402 | return; | |
3403 | ||
996ae0b0 | 3404 | -- Also allow an object of a generic type if extensions allowed |
a6152428 | 3405 | -- and allow this for any type at all. (this may be obsolete ???) |
996ae0b0 RK |
3406 | |
3407 | elsif (Is_Generic_Type (P_Type) | |
a6152428 | 3408 | or else Is_Generic_Actual_Type (P_Type)) |
996ae0b0 RK |
3409 | and then Extensions_Allowed |
3410 | then | |
3411 | return; | |
3412 | end if; | |
3413 | end if; | |
3414 | ||
3415 | -- Fall through if bad prefix | |
3416 | ||
822033eb HK |
3417 | Error_Attr_P |
3418 | ("prefix of % attribute must be object of discriminated type"); | |
996ae0b0 RK |
3419 | |
3420 | --------------- | |
3421 | -- Copy_Sign -- | |
3422 | --------------- | |
3423 | ||
3424 | when Attribute_Copy_Sign => | |
3425 | Check_Floating_Point_Type_2; | |
3426 | Set_Etype (N, P_Base_Type); | |
3427 | Resolve (E1, P_Base_Type); | |
3428 | Resolve (E2, P_Base_Type); | |
3429 | ||
3430 | ----------- | |
3431 | -- Count -- | |
3432 | ----------- | |
3433 | ||
3434 | when Attribute_Count => Count : | |
3435 | declare | |
3436 | Ent : Entity_Id; | |
3437 | S : Entity_Id; | |
3438 | Tsk : Entity_Id; | |
3439 | ||
3440 | begin | |
3441 | Check_E0; | |
3442 | ||
e10dab7f | 3443 | if Nkind_In (P, N_Identifier, N_Expanded_Name) then |
996ae0b0 RK |
3444 | Ent := Entity (P); |
3445 | ||
3446 | if Ekind (Ent) /= E_Entry then | |
3447 | Error_Attr ("invalid entry name", N); | |
3448 | end if; | |
3449 | ||
3450 | elsif Nkind (P) = N_Indexed_Component then | |
07fc65c4 GB |
3451 | if not Is_Entity_Name (Prefix (P)) |
3452 | or else No (Entity (Prefix (P))) | |
3453 | or else Ekind (Entity (Prefix (P))) /= E_Entry_Family | |
3454 | then | |
3455 | if Nkind (Prefix (P)) = N_Selected_Component | |
3456 | and then Present (Entity (Selector_Name (Prefix (P)))) | |
3457 | and then Ekind (Entity (Selector_Name (Prefix (P)))) = | |
3458 | E_Entry_Family | |
3459 | then | |
3460 | Error_Attr | |
3461 | ("attribute % must apply to entry of current task", P); | |
996ae0b0 | 3462 | |
07fc65c4 GB |
3463 | else |
3464 | Error_Attr ("invalid entry family name", P); | |
3465 | end if; | |
996ae0b0 | 3466 | return; |
07fc65c4 GB |
3467 | |
3468 | else | |
3469 | Ent := Entity (Prefix (P)); | |
996ae0b0 RK |
3470 | end if; |
3471 | ||
07fc65c4 GB |
3472 | elsif Nkind (P) = N_Selected_Component |
3473 | and then Present (Entity (Selector_Name (P))) | |
3474 | and then Ekind (Entity (Selector_Name (P))) = E_Entry | |
3475 | then | |
3476 | Error_Attr | |
3477 | ("attribute % must apply to entry of current task", P); | |
3478 | ||
996ae0b0 RK |
3479 | else |
3480 | Error_Attr ("invalid entry name", N); | |
3481 | return; | |
3482 | end if; | |
3483 | ||
3484 | for J in reverse 0 .. Scope_Stack.Last loop | |
3485 | S := Scope_Stack.Table (J).Entity; | |
3486 | ||
3487 | if S = Scope (Ent) then | |
3488 | if Nkind (P) = N_Expanded_Name then | |
3489 | Tsk := Entity (Prefix (P)); | |
3490 | ||
3491 | -- The prefix denotes either the task type, or else a | |
3492 | -- single task whose task type is being analyzed. | |
3493 | ||
b80a2b4b | 3494 | if (Is_Type (Tsk) and then Tsk = S) |
996ae0b0 | 3495 | or else (not Is_Type (Tsk) |
b80a2b4b AC |
3496 | and then Etype (Tsk) = S |
3497 | and then not (Comes_From_Source (S))) | |
996ae0b0 RK |
3498 | then |
3499 | null; | |
3500 | else | |
07fc65c4 GB |
3501 | Error_Attr |
3502 | ("Attribute % must apply to entry of current task", N); | |
996ae0b0 RK |
3503 | end if; |
3504 | end if; | |
3505 | ||
3506 | exit; | |
3507 | ||
3508 | elsif Ekind (Scope (Ent)) in Task_Kind | |
e1b871e9 AC |
3509 | and then |
3510 | not Ekind_In (S, E_Loop, E_Block, E_Entry, E_Entry_Family) | |
996ae0b0 | 3511 | then |
07fc65c4 | 3512 | Error_Attr ("Attribute % cannot appear in inner unit", N); |
996ae0b0 RK |
3513 | |
3514 | elsif Ekind (Scope (Ent)) = E_Protected_Type | |
3515 | and then not Has_Completion (Scope (Ent)) | |
3516 | then | |
3517 | Error_Attr ("attribute % can only be used inside body", N); | |
3518 | end if; | |
3519 | end loop; | |
3520 | ||
3521 | if Is_Overloaded (P) then | |
3522 | declare | |
3523 | Index : Interp_Index; | |
3524 | It : Interp; | |
3525 | ||
3526 | begin | |
3527 | Get_First_Interp (P, Index, It); | |
996ae0b0 RK |
3528 | while Present (It.Nam) loop |
3529 | if It.Nam = Ent then | |
3530 | null; | |
3531 | ||
edd63e9b ES |
3532 | -- Ada 2005 (AI-345): Do not consider primitive entry |
3533 | -- wrappers generated for task or protected types. | |
3534 | ||
0791fbe9 | 3535 | elsif Ada_Version >= Ada_2005 |
edd63e9b ES |
3536 | and then not Comes_From_Source (It.Nam) |
3537 | then | |
3538 | null; | |
3539 | ||
996ae0b0 | 3540 | else |
fbf5a39b | 3541 | Error_Attr ("ambiguous entry name", N); |
996ae0b0 RK |
3542 | end if; |
3543 | ||
3544 | Get_Next_Interp (Index, It); | |
3545 | end loop; | |
3546 | end; | |
3547 | end if; | |
3548 | ||
3549 | Set_Etype (N, Universal_Integer); | |
3550 | end Count; | |
3551 | ||
3552 | ----------------------- | |
3553 | -- Default_Bit_Order -- | |
3554 | ----------------------- | |
3555 | ||
e477d718 | 3556 | when Attribute_Default_Bit_Order => Default_Bit_Order : declare |
7ed57189 | 3557 | Target_Default_Bit_Order : System.Bit_Order; |
e477d718 | 3558 | |
996ae0b0 RK |
3559 | begin |
3560 | Check_Standard_Prefix; | |
996ae0b0 RK |
3561 | |
3562 | if Bytes_Big_Endian then | |
7ed57189 | 3563 | Target_Default_Bit_Order := System.High_Order_First; |
996ae0b0 | 3564 | else |
7ed57189 | 3565 | Target_Default_Bit_Order := System.Low_Order_First; |
996ae0b0 RK |
3566 | end if; |
3567 | ||
7ed57189 AC |
3568 | Rewrite (N, |
3569 | Make_Integer_Literal (Loc, | |
3570 | UI_From_Int (System.Bit_Order'Pos (Target_Default_Bit_Order)))); | |
3571 | ||
996ae0b0 RK |
3572 | Set_Etype (N, Universal_Integer); |
3573 | Set_Is_Static_Expression (N); | |
3574 | end Default_Bit_Order; | |
3575 | ||
7ed57189 AC |
3576 | ---------------------------------- |
3577 | -- Default_Scalar_Storage_Order -- | |
3578 | ---------------------------------- | |
3579 | ||
3580 | when Attribute_Default_Scalar_Storage_Order => Default_SSO : declare | |
3581 | RE_Default_SSO : RE_Id; | |
e477d718 | 3582 | |
7ed57189 AC |
3583 | begin |
3584 | Check_Standard_Prefix; | |
3585 | ||
3586 | case Opt.Default_SSO is | |
3587 | when ' ' => | |
3588 | if Bytes_Big_Endian then | |
3589 | RE_Default_SSO := RE_High_Order_First; | |
3590 | else | |
3591 | RE_Default_SSO := RE_Low_Order_First; | |
3592 | end if; | |
e477d718 | 3593 | |
7ed57189 AC |
3594 | when 'H' => |
3595 | RE_Default_SSO := RE_High_Order_First; | |
e477d718 | 3596 | |
7ed57189 AC |
3597 | when 'L' => |
3598 | RE_Default_SSO := RE_Low_Order_First; | |
e477d718 | 3599 | |
7ed57189 AC |
3600 | when others => |
3601 | raise Program_Error; | |
3602 | end case; | |
3603 | ||
3604 | Rewrite (N, New_Occurrence_Of (RTE (RE_Default_SSO), Loc)); | |
3605 | end Default_SSO; | |
3606 | ||
996ae0b0 RK |
3607 | -------------- |
3608 | -- Definite -- | |
3609 | -------------- | |
3610 | ||
3611 | when Attribute_Definite => | |
3612 | Legal_Formal_Attribute; | |
3613 | ||
3614 | ----------- | |
3615 | -- Delta -- | |
3616 | ----------- | |
3617 | ||
3618 | when Attribute_Delta => | |
3619 | Check_Fixed_Point_Type_0; | |
3620 | Set_Etype (N, Universal_Real); | |
3621 | ||
3622 | ------------ | |
3623 | -- Denorm -- | |
3624 | ------------ | |
3625 | ||
3626 | when Attribute_Denorm => | |
3627 | Check_Floating_Point_Type_0; | |
3628 | Set_Etype (N, Standard_Boolean); | |
3629 | ||
eaed2a2c AC |
3630 | ----------- |
3631 | -- Deref -- | |
3632 | ----------- | |
3633 | ||
3634 | when Attribute_Deref => | |
3635 | Check_Type; | |
3636 | Check_E1; | |
3637 | Resolve (E1, RTE (RE_Address)); | |
3638 | Set_Etype (N, P_Type); | |
3639 | ||
203ddcea AC |
3640 | --------------------- |
3641 | -- Descriptor_Size -- | |
3642 | --------------------- | |
3643 | ||
3644 | when Attribute_Descriptor_Size => | |
3645 | Check_E0; | |
3646 | ||
b80a2b4b | 3647 | if not Is_Entity_Name (P) or else not Is_Type (Entity (P)) then |
cb3d8731 | 3648 | Error_Attr_P ("prefix of attribute % must denote a type"); |
203ddcea AC |
3649 | end if; |
3650 | ||
3651 | Set_Etype (N, Universal_Integer); | |
3652 | ||
996ae0b0 RK |
3653 | ------------ |
3654 | -- Digits -- | |
3655 | ------------ | |
3656 | ||
3657 | when Attribute_Digits => | |
3658 | Check_E0; | |
3659 | Check_Type; | |
3660 | ||
3661 | if not Is_Floating_Point_Type (P_Type) | |
3662 | and then not Is_Decimal_Fixed_Point_Type (P_Type) | |
3663 | then | |
822033eb HK |
3664 | Error_Attr_P |
3665 | ("prefix of % attribute must be float or decimal type"); | |
996ae0b0 RK |
3666 | end if; |
3667 | ||
3668 | Set_Etype (N, Universal_Integer); | |
3669 | ||
3670 | --------------- | |
3671 | -- Elab_Body -- | |
3672 | --------------- | |
3673 | ||
2c1a2cf3 | 3674 | -- Also handles processing for Elab_Spec and Elab_Subp_Body |
996ae0b0 | 3675 | |
0bfc9a64 AC |
3676 | when Attribute_Elab_Body | |
3677 | Attribute_Elab_Spec | | |
3678 | Attribute_Elab_Subp_Body => | |
3679 | ||
996ae0b0 RK |
3680 | Check_E0; |
3681 | Check_Unit_Name (P); | |
3682 | Set_Etype (N, Standard_Void_Type); | |
3683 | ||
3684 | -- We have to manually call the expander in this case to get | |
3685 | -- the necessary expansion (normally attributes that return | |
3686 | -- entities are not expanded). | |
3687 | ||
3688 | Expand (N); | |
3689 | ||
3690 | --------------- | |
3691 | -- Elab_Spec -- | |
3692 | --------------- | |
3693 | ||
3694 | -- Shares processing with Elab_Body | |
3695 | ||
3696 | ---------------- | |
3697 | -- Elaborated -- | |
3698 | ---------------- | |
3699 | ||
3700 | when Attribute_Elaborated => | |
3701 | Check_E0; | |
824e9320 | 3702 | Check_Unit_Name (P); |
996ae0b0 RK |
3703 | Set_Etype (N, Standard_Boolean); |
3704 | ||
3705 | ---------- | |
3706 | -- Emax -- | |
3707 | ---------- | |
3708 | ||
3709 | when Attribute_Emax => | |
3710 | Check_Floating_Point_Type_0; | |
3711 | Set_Etype (N, Universal_Integer); | |
3712 | ||
442ade9d RD |
3713 | ------------- |
3714 | -- Enabled -- | |
3715 | ------------- | |
3716 | ||
3717 | when Attribute_Enabled => | |
3718 | Check_Either_E0_Or_E1; | |
3719 | ||
3720 | if Present (E1) then | |
3721 | if not Is_Entity_Name (E1) or else No (Entity (E1)) then | |
3722 | Error_Msg_N ("entity name expected for Enabled attribute", E1); | |
3723 | E1 := Empty; | |
3724 | end if; | |
3725 | end if; | |
3726 | ||
3727 | if Nkind (P) /= N_Identifier then | |
3728 | Error_Msg_N ("identifier expected (check name)", P); | |
442ade9d RD |
3729 | elsif Get_Check_Id (Chars (P)) = No_Check_Id then |
3730 | Error_Msg_N ("& is not a recognized check name", P); | |
3731 | end if; | |
3732 | ||
3733 | Set_Etype (N, Standard_Boolean); | |
3734 | ||
996ae0b0 RK |
3735 | -------------- |
3736 | -- Enum_Rep -- | |
3737 | -------------- | |
3738 | ||
3739 | when Attribute_Enum_Rep => Enum_Rep : declare | |
3740 | begin | |
3741 | if Present (E1) then | |
3742 | Check_E1; | |
3743 | Check_Discrete_Type; | |
3744 | Resolve (E1, P_Base_Type); | |
75e4e36d | 3745 | |
1956beb8 BD |
3746 | elsif not Is_Discrete_Type (Etype (P)) then |
3747 | Error_Attr_P ("prefix of % attribute must be of discrete type"); | |
996ae0b0 RK |
3748 | end if; |
3749 | ||
3750 | Set_Etype (N, Universal_Integer); | |
3751 | end Enum_Rep; | |
3752 | ||
21d27997 RD |
3753 | -------------- |
3754 | -- Enum_Val -- | |
3755 | -------------- | |
3756 | ||
3757 | when Attribute_Enum_Val => Enum_Val : begin | |
3758 | Check_E1; | |
3759 | Check_Type; | |
3760 | ||
3761 | if not Is_Enumeration_Type (P_Type) then | |
3762 | Error_Attr_P ("prefix of % attribute must be enumeration type"); | |
3763 | end if; | |
3764 | ||
3765 | -- If the enumeration type has a standard representation, the effect | |
3766 | -- is the same as 'Val, so rewrite the attribute as a 'Val. | |
3767 | ||
3768 | if not Has_Non_Standard_Rep (P_Base_Type) then | |
3769 | Rewrite (N, | |
3770 | Make_Attribute_Reference (Loc, | |
3771 | Prefix => Relocate_Node (Prefix (N)), | |
3772 | Attribute_Name => Name_Val, | |
3773 | Expressions => New_List (Relocate_Node (E1)))); | |
3774 | Analyze_And_Resolve (N, P_Base_Type); | |
3775 | ||
3776 | -- Non-standard representation case (enumeration with holes) | |
3777 | ||
3778 | else | |
3779 | Check_Enum_Image; | |
3780 | Resolve (E1, Any_Integer); | |
3781 | Set_Etype (N, P_Base_Type); | |
3782 | end if; | |
3783 | end Enum_Val; | |
3784 | ||
996ae0b0 RK |
3785 | ------------- |
3786 | -- Epsilon -- | |
3787 | ------------- | |
3788 | ||
3789 | when Attribute_Epsilon => | |
3790 | Check_Floating_Point_Type_0; | |
3791 | Set_Etype (N, Universal_Real); | |
3792 | ||
3793 | -------------- | |
3794 | -- Exponent -- | |
3795 | -------------- | |
3796 | ||
3797 | when Attribute_Exponent => | |
3798 | Check_Floating_Point_Type_1; | |
3799 | Set_Etype (N, Universal_Integer); | |
3800 | Resolve (E1, P_Base_Type); | |
3801 | ||
3802 | ------------------ | |
3803 | -- External_Tag -- | |
3804 | ------------------ | |
3805 | ||
3806 | when Attribute_External_Tag => | |
3807 | Check_E0; | |
3808 | Check_Type; | |
3809 | ||
3810 | Set_Etype (N, Standard_String); | |
3811 | ||
3812 | if not Is_Tagged_Type (P_Type) then | |
822033eb | 3813 | Error_Attr_P ("prefix of % attribute must be tagged"); |
996ae0b0 RK |
3814 | end if; |
3815 | ||
7b76e805 RD |
3816 | --------------- |
3817 | -- Fast_Math -- | |
3818 | --------------- | |
3819 | ||
3820 | when Attribute_Fast_Math => | |
7b76e805 | 3821 | Check_Standard_Prefix; |
21791d97 | 3822 | Rewrite (N, New_Occurrence_Of (Boolean_Literals (Fast_Math), Loc)); |
7b76e805 | 3823 | |
996ae0b0 RK |
3824 | ----------- |
3825 | -- First -- | |
3826 | ----------- | |
3827 | ||
3828 | when Attribute_First => | |
3829 | Check_Array_Or_Scalar_Type; | |
26df19ce | 3830 | Bad_Attribute_For_Predicate; |
996ae0b0 RK |
3831 | |
3832 | --------------- | |
3833 | -- First_Bit -- | |
3834 | --------------- | |
3835 | ||
3836 | when Attribute_First_Bit => | |
3837 | Check_Component; | |
3838 | Set_Etype (N, Universal_Integer); | |
3839 | ||
011f9d5d AC |
3840 | ----------------- |
3841 | -- First_Valid -- | |
3842 | ----------------- | |
3843 | ||
3844 | when Attribute_First_Valid => | |
3845 | Check_First_Last_Valid; | |
3846 | Set_Etype (N, P_Type); | |
3847 | ||
996ae0b0 RK |
3848 | ----------------- |
3849 | -- Fixed_Value -- | |
3850 | ----------------- | |
3851 | ||
3852 | when Attribute_Fixed_Value => | |
3853 | Check_E1; | |
3854 | Check_Fixed_Point_Type; | |
3855 | Resolve (E1, Any_Integer); | |
3856 | Set_Etype (N, P_Base_Type); | |
3857 | ||
3858 | ----------- | |
3859 | -- Floor -- | |
3860 | ----------- | |
3861 | ||
3862 | when Attribute_Floor => | |
3863 | Check_Floating_Point_Type_1; | |
3864 | Set_Etype (N, P_Base_Type); | |
3865 | Resolve (E1, P_Base_Type); | |
3866 | ||
3867 | ---------- | |
3868 | -- Fore -- | |
3869 | ---------- | |
3870 | ||
3871 | when Attribute_Fore => | |
3872 | Check_Fixed_Point_Type_0; | |
3873 | Set_Etype (N, Universal_Integer); | |
3874 | ||
3875 | -------------- | |
3876 | -- Fraction -- | |
3877 | -------------- | |
3878 | ||
3879 | when Attribute_Fraction => | |
3880 | Check_Floating_Point_Type_1; | |
3881 | Set_Etype (N, P_Base_Type); | |
3882 | Resolve (E1, P_Base_Type); | |
3883 | ||
54838d1f AC |
3884 | -------------- |
3885 | -- From_Any -- | |
3886 | -------------- | |
3887 | ||
3888 | when Attribute_From_Any => | |
3889 | Check_E1; | |
3890 | Check_PolyORB_Attribute; | |
3891 | Set_Etype (N, P_Base_Type); | |
3892 | ||
15ce9ca2 AC |
3893 | ----------------------- |
3894 | -- Has_Access_Values -- | |
3895 | ----------------------- | |
3896 | ||
3897 | when Attribute_Has_Access_Values => | |
3898 | Check_Type; | |
3899 | Check_E0; | |
3900 | Set_Etype (N, Standard_Boolean); | |
3901 | ||
ea70f3d0 RD |
3902 | ---------------------- |
3903 | -- Has_Same_Storage -- | |
3904 | ---------------------- | |
3905 | ||
3906 | when Attribute_Has_Same_Storage => | |
ea70f3d0 RD |
3907 | Check_E1; |
3908 | ||
3909 | -- The arguments must be objects of any type | |
3910 | ||
3911 | Analyze_And_Resolve (P); | |
3912 | Analyze_And_Resolve (E1); | |
3913 | Check_Object_Reference (P); | |
3914 | Check_Object_Reference (E1); | |
3915 | Set_Etype (N, Standard_Boolean); | |
3916 | ||
21d27997 RD |
3917 | ----------------------- |
3918 | -- Has_Tagged_Values -- | |
3919 | ----------------------- | |
3920 | ||
3921 | when Attribute_Has_Tagged_Values => | |
3922 | Check_Type; | |
3923 | Check_E0; | |
3924 | Set_Etype (N, Standard_Boolean); | |
3925 | ||
996ae0b0 RK |
3926 | ----------------------- |
3927 | -- Has_Discriminants -- | |
3928 | ----------------------- | |
3929 | ||
3930 | when Attribute_Has_Discriminants => | |
3931 | Legal_Formal_Attribute; | |
3932 | ||
3933 | -------------- | |
3934 | -- Identity -- | |
3935 | -------------- | |
3936 | ||
3937 | when Attribute_Identity => | |
3938 | Check_E0; | |
3939 | Analyze (P); | |
3940 | ||
1b1d88b1 | 3941 | if Etype (P) = Standard_Exception_Type then |
996ae0b0 RK |
3942 | Set_Etype (N, RTE (RE_Exception_Id)); |
3943 | ||
b80a2b4b AC |
3944 | -- Ada 2005 (AI-345): Attribute 'Identity may be applied to task |
3945 | -- interface class-wide types. | |
65f01153 | 3946 | |
996ae0b0 RK |
3947 | elsif Is_Task_Type (Etype (P)) |
3948 | or else (Is_Access_Type (Etype (P)) | |
65f01153 | 3949 | and then Is_Task_Type (Designated_Type (Etype (P)))) |
0791fbe9 | 3950 | or else (Ada_Version >= Ada_2005 |
65f01153 RD |
3951 | and then Ekind (Etype (P)) = E_Class_Wide_Type |
3952 | and then Is_Interface (Etype (P)) | |
3953 | and then Is_Task_Interface (Etype (P))) | |
996ae0b0 | 3954 | then |
fbf5a39b | 3955 | Resolve (P); |
b5e792e2 | 3956 | Set_Etype (N, RTE (RO_AT_Task_Id)); |
996ae0b0 RK |
3957 | |
3958 | else | |
0791fbe9 | 3959 | if Ada_Version >= Ada_2005 then |
822033eb HK |
3960 | Error_Attr_P |
3961 | ("prefix of % attribute must be an exception, a " & | |
3962 | "task or a task interface class-wide object"); | |
65f01153 | 3963 | else |
822033eb HK |
3964 | Error_Attr_P |
3965 | ("prefix of % attribute must be a task or an exception"); | |
65f01153 | 3966 | end if; |
996ae0b0 RK |
3967 | end if; |
3968 | ||
3969 | ----------- | |
3970 | -- Image -- | |
3971 | ----------- | |
3972 | ||
e361e9a1 | 3973 | when Attribute_Image => Image : begin |
ce5ba43a | 3974 | Check_SPARK_05_Restriction_On_Attribute; |
e361e9a1 AC |
3975 | |
3976 | -- AI12-00124-1 : The ARG has adopted the GNAT semantics of 'Img | |
3977 | -- for scalar types, so that the prefix can be an object and not | |
3978 | -- a type, and there is no need for an argument. Given this vote | |
3979 | -- of confidence from the ARG, simplest is to transform this new | |
3980 | -- usage of 'Image into a reference to 'Img. | |
3981 | ||
3982 | if Ada_Version > Ada_2005 | |
3983 | and then Is_Object_Reference (P) | |
3984 | and then Is_Scalar_Type (P_Type) | |
3985 | then | |
3986 | Rewrite (N, | |
3987 | Make_Attribute_Reference (Loc, | |
3988 | Prefix => Relocate_Node (P), | |
3989 | Attribute_Name => Name_Img)); | |
3990 | Analyze (N); | |
3991 | return; | |
3992 | ||
3993 | else | |
3994 | Check_Scalar_Type; | |
3995 | end if; | |
3996 | ||
7a489a2b | 3997 | Set_Etype (N, Standard_String); |
996ae0b0 RK |
3998 | |
3999 | if Is_Real_Type (P_Type) then | |
0ab80019 | 4000 | if Ada_Version = Ada_83 and then Comes_From_Source (N) then |
996ae0b0 RK |
4001 | Error_Msg_Name_1 := Aname; |
4002 | Error_Msg_N | |
4003 | ("(Ada 83) % attribute not allowed for real types", N); | |
4004 | end if; | |
4005 | end if; | |
4006 | ||
4007 | if Is_Enumeration_Type (P_Type) then | |
4008 | Check_Restriction (No_Enumeration_Maps, N); | |
4009 | end if; | |
4010 | ||
4011 | Check_E1; | |
4012 | Resolve (E1, P_Base_Type); | |
4013 | Check_Enum_Image; | |
4014 | Validate_Non_Static_Attribute_Function_Call; | |
0688dac8 RD |
4015 | |
4016 | -- Check restriction No_Fixed_IO. Note the check of Comes_From_Source | |
4017 | -- to avoid giving a duplicate message for Img expanded into Image. | |
4018 | ||
4019 | if Restriction_Check_Required (No_Fixed_IO) | |
4020 | and then Comes_From_Source (N) | |
4021 | and then Is_Fixed_Point_Type (P_Type) | |
4022 | then | |
4023 | Check_Restriction (No_Fixed_IO, P); | |
4024 | end if; | |
996ae0b0 RK |
4025 | end Image; |
4026 | ||
4027 | --------- | |
4028 | -- Img -- | |
4029 | --------- | |
4030 | ||
4031 | when Attribute_Img => Img : | |
4032 | begin | |
9c5a3a8d | 4033 | Check_E0; |
996ae0b0 RK |
4034 | Set_Etype (N, Standard_String); |
4035 | ||
4036 | if not Is_Scalar_Type (P_Type) | |
4037 | or else (Is_Entity_Name (P) and then Is_Type (Entity (P))) | |
4038 | then | |
822033eb HK |
4039 | Error_Attr_P |
4040 | ("prefix of % attribute must be scalar object name"); | |
996ae0b0 RK |
4041 | end if; |
4042 | ||
4043 | Check_Enum_Image; | |
0688dac8 RD |
4044 | |
4045 | -- Check restriction No_Fixed_IO | |
4046 | ||
4047 | if Restriction_Check_Required (No_Fixed_IO) | |
4048 | and then Is_Fixed_Point_Type (P_Type) | |
4049 | then | |
4050 | Check_Restriction (No_Fixed_IO, P); | |
4051 | end if; | |
996ae0b0 RK |
4052 | end Img; |
4053 | ||
4054 | ----------- | |
4055 | -- Input -- | |
4056 | ----------- | |
4057 | ||
4058 | when Attribute_Input => | |
4059 | Check_E1; | |
fbf5a39b | 4060 | Check_Stream_Attribute (TSS_Stream_Input); |
996ae0b0 RK |
4061 | Set_Etype (N, P_Base_Type); |
4062 | ||
4063 | ------------------- | |
4064 | -- Integer_Value -- | |
4065 | ------------------- | |
4066 | ||
4067 | when Attribute_Integer_Value => | |
4068 | Check_E1; | |
4069 | Check_Integer_Type; | |
4070 | Resolve (E1, Any_Fixed); | |
5a218498 ST |
4071 | |
4072 | -- Signal an error if argument type is not a specific fixed-point | |
4073 | -- subtype. An error has been signalled already if the argument | |
4074 | -- was not of a fixed-point type. | |
4075 | ||
4076 | if Etype (E1) = Any_Fixed and then not Error_Posted (E1) then | |
4077 | Error_Attr ("argument of % must be of a fixed-point type", E1); | |
4078 | end if; | |
4079 | ||
996ae0b0 RK |
4080 | Set_Etype (N, P_Base_Type); |
4081 | ||
21d27997 RD |
4082 | ------------------- |
4083 | -- Invalid_Value -- | |
4084 | ------------------- | |
4085 | ||
4086 | when Attribute_Invalid_Value => | |
4087 | Check_E0; | |
4088 | Check_Scalar_Type; | |
4089 | Set_Etype (N, P_Base_Type); | |
4090 | Invalid_Value_Used := True; | |
4091 | ||
996ae0b0 RK |
4092 | ----------- |
4093 | -- Large -- | |
4094 | ----------- | |
4095 | ||
4096 | when Attribute_Large => | |
4097 | Check_E0; | |
4098 | Check_Real_Type; | |
4099 | Set_Etype (N, Universal_Real); | |
4100 | ||
4101 | ---------- | |
4102 | -- Last -- | |
4103 | ---------- | |
4104 | ||
4105 | when Attribute_Last => | |
4106 | Check_Array_Or_Scalar_Type; | |
26df19ce | 4107 | Bad_Attribute_For_Predicate; |
996ae0b0 RK |
4108 | |
4109 | -------------- | |
4110 | -- Last_Bit -- | |
4111 | -------------- | |
4112 | ||
4113 | when Attribute_Last_Bit => | |
4114 | Check_Component; | |
4115 | Set_Etype (N, Universal_Integer); | |
4116 | ||
011f9d5d AC |
4117 | ---------------- |
4118 | -- Last_Valid -- | |
4119 | ---------------- | |
4120 | ||
4121 | when Attribute_Last_Valid => | |
4122 | Check_First_Last_Valid; | |
4123 | Set_Etype (N, P_Type); | |
4124 | ||
996ae0b0 RK |
4125 | ------------------ |
4126 | -- Leading_Part -- | |
4127 | ------------------ | |
4128 | ||
4129 | when Attribute_Leading_Part => | |
4130 | Check_Floating_Point_Type_2; | |
4131 | Set_Etype (N, P_Base_Type); | |
4132 | Resolve (E1, P_Base_Type); | |
4133 | Resolve (E2, Any_Integer); | |
4134 | ||
4135 | ------------ | |
4136 | -- Length -- | |
4137 | ------------ | |
4138 | ||
4139 | when Attribute_Length => | |
4140 | Check_Array_Type; | |
4141 | Set_Etype (N, Universal_Integer); | |
4142 | ||
f7ea2603 RD |
4143 | ------------------- |
4144 | -- Library_Level -- | |
4145 | ------------------- | |
4146 | ||
4147 | when Attribute_Library_Level => | |
4148 | Check_E0; | |
cf3b97ef AC |
4149 | |
4150 | if not Is_Entity_Name (P) then | |
4151 | Error_Attr_P ("prefix of % attribute must be an entity name"); | |
4152 | end if; | |
f7ea2603 RD |
4153 | |
4154 | if not Inside_A_Generic then | |
4155 | Set_Boolean_Result (N, | |
cf3b97ef | 4156 | Is_Library_Level_Entity (Entity (P))); |
f7ea2603 RD |
4157 | end if; |
4158 | ||
4159 | Set_Etype (N, Standard_Boolean); | |
4160 | ||
2a290fec AC |
4161 | --------------- |
4162 | -- Lock_Free -- | |
4163 | --------------- | |
4164 | ||
4165 | when Attribute_Lock_Free => | |
4166 | Check_E0; | |
4167 | Set_Etype (N, Standard_Boolean); | |
4168 | ||
4169 | if not Is_Protected_Type (P_Type) then | |
4170 | Error_Attr_P | |
4171 | ("prefix of % attribute must be a protected object"); | |
4172 | end if; | |
4173 | ||
150ac76e AC |
4174 | ---------------- |
4175 | -- Loop_Entry -- | |
4176 | ---------------- | |
4177 | ||
4178 | when Attribute_Loop_Entry => Loop_Entry : declare | |
4179 | procedure Check_References_In_Prefix (Loop_Id : Entity_Id); | |
4180 | -- Inspect the prefix for any uses of entities declared within the | |
4181 | -- related loop. Loop_Id denotes the loop identifier. | |
4182 | ||
4183 | -------------------------------- | |
4184 | -- Check_References_In_Prefix -- | |
4185 | -------------------------------- | |
4186 | ||
4187 | procedure Check_References_In_Prefix (Loop_Id : Entity_Id) is | |
4188 | Loop_Decl : constant Node_Id := Label_Construct (Parent (Loop_Id)); | |
4189 | ||
4190 | function Check_Reference (Nod : Node_Id) return Traverse_Result; | |
4191 | -- Determine whether a reference mentions an entity declared | |
4192 | -- within the related loop. | |
4193 | ||
4194 | function Declared_Within (Nod : Node_Id) return Boolean; | |
4195 | -- Determine whether Nod appears in the subtree of Loop_Decl | |
4196 | ||
4197 | --------------------- | |
4198 | -- Check_Reference -- | |
4199 | --------------------- | |
4200 | ||
4201 | function Check_Reference (Nod : Node_Id) return Traverse_Result is | |
4202 | begin | |
4203 | if Nkind (Nod) = N_Identifier | |
4204 | and then Present (Entity (Nod)) | |
4205 | and then Declared_Within (Declaration_Node (Entity (Nod))) | |
4206 | then | |
4207 | Error_Attr | |
4208 | ("prefix of attribute % cannot reference local entities", | |
4209 | Nod); | |
4210 | return Abandon; | |
4211 | else | |
4212 | return OK; | |
4213 | end if; | |
4214 | end Check_Reference; | |
4215 | ||
4216 | procedure Check_References is new Traverse_Proc (Check_Reference); | |
4217 | ||
4218 | --------------------- | |
4219 | -- Declared_Within -- | |
4220 | --------------------- | |
4221 | ||
4222 | function Declared_Within (Nod : Node_Id) return Boolean is | |
4223 | Stmt : Node_Id; | |
4224 | ||
4225 | begin | |
4226 | Stmt := Nod; | |
4227 | while Present (Stmt) loop | |
4228 | if Stmt = Loop_Decl then | |
4229 | return True; | |
4230 | ||
4231 | -- Prevent the search from going too far | |
4232 | ||
a7e68e7f | 4233 | elsif Is_Body_Or_Package_Declaration (Stmt) then |
150ac76e AC |
4234 | exit; |
4235 | end if; | |
4236 | ||
4237 | Stmt := Parent (Stmt); | |
4238 | end loop; | |
4239 | ||
4240 | return False; | |
4241 | end Declared_Within; | |
4242 | ||
4243 | -- Start of processing for Check_Prefix_For_Local_References | |
4244 | ||
4245 | begin | |
4246 | Check_References (P); | |
4247 | end Check_References_In_Prefix; | |
4248 | ||
4249 | -- Local variables | |
4250 | ||
24778dbb | 4251 | Context : constant Node_Id := Parent (N); |
3d67b239 | 4252 | Attr : Node_Id; |
150ac76e | 4253 | Enclosing_Loop : Node_Id; |
150ac76e AC |
4254 | Loop_Id : Entity_Id := Empty; |
4255 | Scop : Entity_Id; | |
4256 | Stmt : Node_Id; | |
6782b1ef | 4257 | Enclosing_Pragma : Node_Id := Empty; |
150ac76e AC |
4258 | |
4259 | -- Start of processing for Loop_Entry | |
4260 | ||
4261 | begin | |
3d67b239 AC |
4262 | Attr := N; |
4263 | ||
4264 | -- Set the type of the attribute now to ensure the successfull | |
4265 | -- continuation of analysis even if the attribute is misplaced. | |
4266 | ||
4267 | Set_Etype (Attr, P_Type); | |
4268 | ||
24778dbb | 4269 | -- Attribute 'Loop_Entry may appear in several flavors: |
739e7bbf | 4270 | |
24778dbb AC |
4271 | -- * Prefix'Loop_Entry - in this form, the attribute applies to the |
4272 | -- nearest enclosing loop. | |
739e7bbf | 4273 | |
24778dbb AC |
4274 | -- * Prefix'Loop_Entry (Expr) - depending on what Expr denotes, the |
4275 | -- attribute may be related to a loop denoted by label Expr or | |
4276 | -- the prefix may denote an array object and Expr may act as an | |
4277 | -- indexed component. | |
739e7bbf | 4278 | |
24778dbb AC |
4279 | -- * Prefix'Loop_Entry (Expr1, ..., ExprN) - the attribute applies |
4280 | -- to the nearest enclosing loop, all expressions are part of | |
4281 | -- an indexed component. | |
739e7bbf | 4282 | |
24778dbb AC |
4283 | -- * Prefix'Loop_Entry (Expr) (...) (...) - depending on what Expr |
4284 | -- denotes, the attribute may be related to a loop denoted by | |
4285 | -- label Expr or the prefix may denote a multidimensional array | |
4286 | -- array object and Expr along with the rest of the expressions | |
4287 | -- may act as indexed components. | |
739e7bbf | 4288 | |
24778dbb AC |
4289 | -- Regardless of variations, the attribute reference does not have an |
4290 | -- expression list. Instead, all available expressions are stored as | |
4291 | -- indexed components. | |
739e7bbf | 4292 | |
24778dbb AC |
4293 | -- When the attribute is part of an indexed component, find the first |
4294 | -- expression as it will determine the semantics of 'Loop_Entry. | |
739e7bbf | 4295 | |
24778dbb AC |
4296 | if Nkind (Context) = N_Indexed_Component then |
4297 | E1 := First (Expressions (Context)); | |
4298 | E2 := Next (E1); | |
739e7bbf | 4299 | |
24778dbb AC |
4300 | -- The attribute reference appears in the following form: |
4301 | ||
4302 | -- Prefix'Loop_Entry (Exp1, Expr2, ..., ExprN) [(...)] | |
4303 | ||
4304 | -- In this case, the loop name is omitted and no rewriting is | |
4305 | -- required. | |
4306 | ||
4307 | if Present (E2) then | |
4308 | null; | |
4309 | ||
4310 | -- The form of the attribute is: | |
739e7bbf | 4311 | |
24778dbb AC |
4312 | -- Prefix'Loop_Entry (Expr) [(...)] |
4313 | ||
4314 | -- If Expr denotes a loop entry, the whole attribute and indexed | |
4315 | -- component will have to be rewritten to reflect this relation. | |
739e7bbf AC |
4316 | |
4317 | else | |
24778dbb AC |
4318 | pragma Assert (Present (E1)); |
4319 | ||
4320 | -- Do not expand the expression as it may have side effects. | |
4321 | -- Simply preanalyze to determine whether it is a loop name or | |
4322 | -- something else. | |
4323 | ||
4324 | Preanalyze_And_Resolve (E1); | |
4325 | ||
4326 | if Is_Entity_Name (E1) | |
4327 | and then Present (Entity (E1)) | |
4328 | and then Ekind (Entity (E1)) = E_Loop | |
4329 | then | |
4330 | Loop_Id := Entity (E1); | |
4331 | ||
4332 | -- Transform the attribute and enclosing indexed component | |
4333 | ||
4334 | Set_Expressions (N, Expressions (Context)); | |
4335 | Rewrite (Context, N); | |
4336 | Set_Etype (Context, P_Type); | |
3d67b239 AC |
4337 | |
4338 | Attr := Context; | |
24778dbb | 4339 | end if; |
739e7bbf AC |
4340 | end if; |
4341 | end if; | |
150ac76e AC |
4342 | |
4343 | -- The prefix must denote an object | |
4344 | ||
4345 | if not Is_Object_Reference (P) then | |
4346 | Error_Attr_P ("prefix of attribute % must denote an object"); | |
4347 | end if; | |
4348 | ||
4349 | -- The prefix cannot be of a limited type because the expansion of | |
4350 | -- Loop_Entry must create a constant initialized by the evaluated | |
4351 | -- prefix. | |
4352 | ||
51245e2d | 4353 | if Is_Limited_View (Etype (P)) then |
150ac76e AC |
4354 | Error_Attr_P ("prefix of attribute % cannot be limited"); |
4355 | end if; | |
4356 | ||
150ac76e AC |
4357 | -- Climb the parent chain to verify the location of the attribute and |
4358 | -- find the enclosing loop. | |
4359 | ||
3d67b239 | 4360 | Stmt := Attr; |
150ac76e AC |
4361 | while Present (Stmt) loop |
4362 | ||
65441a1e RD |
4363 | -- Locate the corresponding enclosing pragma. Note that in the |
4364 | -- case of Assert[And_Cut] and Assume, we have already checked | |
4365 | -- that the pragma appears in an appropriate loop location. | |
150ac76e AC |
4366 | |
4367 | if Nkind (Original_Node (Stmt)) = N_Pragma | |
65441a1e RD |
4368 | and then Nam_In (Pragma_Name (Original_Node (Stmt)), |
4369 | Name_Loop_Invariant, | |
4370 | Name_Loop_Variant, | |
4371 | Name_Assert, | |
4372 | Name_Assert_And_Cut, | |
4373 | Name_Assume) | |
150ac76e | 4374 | then |
6782b1ef | 4375 | Enclosing_Pragma := Original_Node (Stmt); |
150ac76e AC |
4376 | |
4377 | -- Locate the enclosing loop (if any). Note that Ada 2012 array | |
4378 | -- iteration may be expanded into several nested loops, we are | |
03a72cd3 AC |
4379 | -- interested in the outermost one which has the loop identifier, |
4380 | -- and comes from source. | |
150ac76e AC |
4381 | |
4382 | elsif Nkind (Stmt) = N_Loop_Statement | |
4383 | and then Present (Identifier (Stmt)) | |
03a72cd3 AC |
4384 | and then Comes_From_Source (Original_Node (Stmt)) |
4385 | and then Nkind (Original_Node (Stmt)) = N_Loop_Statement | |
150ac76e AC |
4386 | then |
4387 | Enclosing_Loop := Stmt; | |
739e7bbf AC |
4388 | |
4389 | -- The original attribute reference may lack a loop name. Use | |
4390 | -- the name of the enclosing loop because it is the related | |
4391 | -- loop. | |
4392 | ||
4393 | if No (Loop_Id) then | |
4394 | Loop_Id := Entity (Identifier (Enclosing_Loop)); | |
4395 | end if; | |
4396 | ||
150ac76e AC |
4397 | exit; |
4398 | ||
4399 | -- Prevent the search from going too far | |
4400 | ||
a7e68e7f | 4401 | elsif Is_Body_Or_Package_Declaration (Stmt) then |
150ac76e AC |
4402 | exit; |
4403 | end if; | |
4404 | ||
4405 | Stmt := Parent (Stmt); | |
4406 | end loop; | |
4407 | ||
f3bf0d9a HK |
4408 | -- Loop_Entry must appear within a Loop_Assertion pragma (Assert, |
4409 | -- Assert_And_Cut, Assume count as loop assertion pragmas for this | |
4410 | -- purpose if they appear in an appropriate location in a loop, | |
4411 | -- which was already checked by the top level pragma circuit). | |
150ac76e | 4412 | |
6782b1ef AC |
4413 | if No (Enclosing_Pragma) then |
4414 | Error_Attr ("attribute% must appear within appropriate pragma", N); | |
150ac76e AC |
4415 | end if; |
4416 | ||
6782b1ef | 4417 | -- A Loop_Entry that applies to a given loop statement must not |
150ac76e AC |
4418 | -- appear within a body of accept statement, if this construct is |
4419 | -- itself enclosed by the given loop statement. | |
4420 | ||
3d67b239 AC |
4421 | for Index in reverse 0 .. Scope_Stack.Last loop |
4422 | Scop := Scope_Stack.Table (Index).Entity; | |
150ac76e AC |
4423 | |
4424 | if Ekind (Scop) = E_Loop and then Scop = Loop_Id then | |
4425 | exit; | |
150ac76e AC |
4426 | elsif Ekind_In (Scop, E_Block, E_Loop, E_Return_Statement) then |
4427 | null; | |
150ac76e AC |
4428 | else |
4429 | Error_Attr | |
739e7bbf | 4430 | ("attribute % cannot appear in body or accept statement", N); |
150ac76e AC |
4431 | exit; |
4432 | end if; | |
4433 | end loop; | |
4434 | ||
4435 | -- The prefix cannot mention entities declared within the related | |
4436 | -- loop because they will not be visible once the prefix is moved | |
4437 | -- outside the loop. | |
4438 | ||
4439 | Check_References_In_Prefix (Loop_Id); | |
4440 | ||
4441 | -- The prefix must denote a static entity if the pragma does not | |
ea0f1fc8 AC |
4442 | -- apply to the innermost enclosing loop statement, or if it appears |
4443 | -- within a potentially unevaluated epxression. | |
150ac76e | 4444 | |
ea0f1fc8 AC |
4445 | if Is_Entity_Name (P) |
4446 | or else Nkind (Parent (P)) = N_Object_Renaming_Declaration | |
150ac76e | 4447 | then |
ea0f1fc8 AC |
4448 | null; |
4449 | ||
4450 | elsif Present (Enclosing_Loop) | |
6782b1ef | 4451 | and then Entity (Identifier (Enclosing_Loop)) /= Loop_Id |
ea0f1fc8 | 4452 | then |
6782b1ef | 4453 | Error_Attr_P |
bf0b0e5e AC |
4454 | ("prefix of attribute % that applies to outer loop must denote " |
4455 | & "an entity"); | |
ea0f1fc8 AC |
4456 | |
4457 | elsif Is_Potentially_Unevaluated (P) then | |
96e90ac1 | 4458 | Uneval_Old_Msg; |
6782b1ef AC |
4459 | end if; |
4460 | ||
bf0b0e5e AC |
4461 | -- Replace the Loop_Entry attribute reference by its prefix if the |
4462 | -- related pragma is ignored. This transformation is OK with respect | |
4463 | -- to typing because Loop_Entry's type is that of its prefix. This | |
4464 | -- early transformation also avoids the generation of a useless loop | |
4465 | -- entry constant. | |
6782b1ef AC |
4466 | |
4467 | if Is_Ignored (Enclosing_Pragma) then | |
4468 | Rewrite (N, Relocate_Node (P)); | |
150ac76e | 4469 | end if; |
bf0b0e5e AC |
4470 | |
4471 | Preanalyze_And_Resolve (P); | |
150ac76e AC |
4472 | end Loop_Entry; |
4473 | ||
996ae0b0 RK |
4474 | ------------- |
4475 | -- Machine -- | |
4476 | ------------- | |
4477 | ||
4478 | when Attribute_Machine => | |
4479 | Check_Floating_Point_Type_1; | |
4480 | Set_Etype (N, P_Base_Type); | |
4481 | Resolve (E1, P_Base_Type); | |
4482 | ||
4483 | ------------------ | |
4484 | -- Machine_Emax -- | |
4485 | ------------------ | |
4486 | ||
4487 | when Attribute_Machine_Emax => | |
4488 | Check_Floating_Point_Type_0; | |
4489 | Set_Etype (N, Universal_Integer); | |
4490 | ||
4491 | ------------------ | |
4492 | -- Machine_Emin -- | |
4493 | ------------------ | |
4494 | ||
4495 | when Attribute_Machine_Emin => | |
4496 | Check_Floating_Point_Type_0; | |
4497 | Set_Etype (N, Universal_Integer); | |
4498 | ||
4499 | ---------------------- | |
4500 | -- Machine_Mantissa -- | |
4501 | ---------------------- | |
4502 | ||
4503 | when Attribute_Machine_Mantissa => | |
4504 | Check_Floating_Point_Type_0; | |
4505 | Set_Etype (N, Universal_Integer); | |
4506 | ||
4507 | ----------------------- | |
4508 | -- Machine_Overflows -- | |
4509 | ----------------------- | |
4510 | ||
4511 | when Attribute_Machine_Overflows => | |
4512 | Check_Real_Type; | |
4513 | Check_E0; | |
4514 | Set_Etype (N, Standard_Boolean); | |
4515 | ||
4516 | ------------------- | |
4517 | -- Machine_Radix -- | |
4518 | ------------------- | |
4519 | ||
4520 | when Attribute_Machine_Radix => | |
4521 | Check_Real_Type; | |
4522 | Check_E0; | |
4523 | Set_Etype (N, Universal_Integer); | |
4524 | ||
65f01153 RD |
4525 | ---------------------- |
4526 | -- Machine_Rounding -- | |
4527 | ---------------------- | |
4528 | ||
4529 | when Attribute_Machine_Rounding => | |
4530 | Check_Floating_Point_Type_1; | |
4531 | Set_Etype (N, P_Base_Type); | |
4532 | Resolve (E1, P_Base_Type); | |
4533 | ||
996ae0b0 RK |
4534 | -------------------- |
4535 | -- Machine_Rounds -- | |
4536 | -------------------- | |
4537 | ||
4538 | when Attribute_Machine_Rounds => | |
4539 | Check_Real_Type; | |
4540 | Check_E0; | |
4541 | Set_Etype (N, Standard_Boolean); | |
4542 | ||
4543 | ------------------ | |
4544 | -- Machine_Size -- | |
4545 | ------------------ | |
4546 | ||
4547 | when Attribute_Machine_Size => | |
4548 | Check_E0; | |
4549 | Check_Type; | |
4550 | Check_Not_Incomplete_Type; | |
4551 | Set_Etype (N, Universal_Integer); | |
4552 | ||
4553 | -------------- | |
4554 | -- Mantissa -- | |
4555 | -------------- | |
4556 | ||
4557 | when Attribute_Mantissa => | |
4558 | Check_E0; | |
4559 | Check_Real_Type; | |
4560 | Set_Etype (N, Universal_Integer); | |
4561 | ||
4562 | --------- | |
4563 | -- Max -- | |
4564 | --------- | |
4565 | ||
4566 | when Attribute_Max => | |
85d6bf87 | 4567 | Min_Max; |
996ae0b0 | 4568 | |
85d6bf87 AC |
4569 | ---------------------------------- |
4570 | -- Max_Alignment_For_Allocation -- | |
4571 | ---------------------------------- | |
428684fd | 4572 | |
85d6bf87 AC |
4573 | when Attribute_Max_Size_In_Storage_Elements => |
4574 | Max_Alignment_For_Allocation_Max_Size_In_Storage_Elements; | |
428684fd | 4575 | |
996ae0b0 RK |
4576 | ---------------------------------- |
4577 | -- Max_Size_In_Storage_Elements -- | |
4578 | ---------------------------------- | |
4579 | ||
85d6bf87 AC |
4580 | when Attribute_Max_Alignment_For_Allocation => |
4581 | Max_Alignment_For_Allocation_Max_Size_In_Storage_Elements; | |
996ae0b0 RK |
4582 | |
4583 | ----------------------- | |
4584 | -- Maximum_Alignment -- | |
4585 | ----------------------- | |
4586 | ||
4587 | when Attribute_Maximum_Alignment => | |
4588 | Standard_Attribute (Ttypes.Maximum_Alignment); | |
4589 | ||
4590 | -------------------- | |
4591 | -- Mechanism_Code -- | |
4592 | -------------------- | |
4593 | ||
4594 | when Attribute_Mechanism_Code => | |
996ae0b0 RK |
4595 | if not Is_Entity_Name (P) |
4596 | or else not Is_Subprogram (Entity (P)) | |
4597 | then | |
822033eb | 4598 | Error_Attr_P ("prefix of % attribute must be subprogram"); |
996ae0b0 RK |
4599 | end if; |
4600 | ||
4601 | Check_Either_E0_Or_E1; | |
4602 | ||
4603 | if Present (E1) then | |
4604 | Resolve (E1, Any_Integer); | |
4605 | Set_Etype (E1, Standard_Integer); | |
4606 | ||
edab6088 | 4607 | if not Is_OK_Static_Expression (E1) then |
fbf5a39b AC |
4608 | Flag_Non_Static_Expr |
4609 | ("expression for parameter number must be static!", E1); | |
4610 | Error_Attr; | |
996ae0b0 RK |
4611 | |
4612 | elsif UI_To_Int (Intval (E1)) > Number_Formals (Entity (P)) | |
4613 | or else UI_To_Int (Intval (E1)) < 0 | |
4614 | then | |
1b0b0f18 | 4615 | Error_Attr ("invalid parameter number for % attribute", E1); |
996ae0b0 RK |
4616 | end if; |
4617 | end if; | |
4618 | ||
4619 | Set_Etype (N, Universal_Integer); | |
4620 | ||
4621 | --------- | |
4622 | -- Min -- | |
4623 | --------- | |
4624 | ||
4625 | when Attribute_Min => | |
85d6bf87 | 4626 | Min_Max; |
428684fd | 4627 | |
5f3ab6fb AC |
4628 | --------- |
4629 | -- Mod -- | |
4630 | --------- | |
4631 | ||
4632 | when Attribute_Mod => | |
4633 | ||
4634 | -- Note: this attribute is only allowed in Ada 2005 mode, but | |
4635 | -- we do not need to test that here, since Mod is only recognized | |
4636 | -- as an attribute name in Ada 2005 mode during the parse. | |
4637 | ||
4638 | Check_E1; | |
4639 | Check_Modular_Integer_Type; | |
4640 | Resolve (E1, Any_Integer); | |
4641 | Set_Etype (N, P_Base_Type); | |
4642 | ||
996ae0b0 RK |
4643 | ----------- |
4644 | -- Model -- | |
4645 | ----------- | |
4646 | ||
4647 | when Attribute_Model => | |
4648 | Check_Floating_Point_Type_1; | |
4649 | Set_Etype (N, P_Base_Type); | |
4650 | Resolve (E1, P_Base_Type); | |
4651 | ||
4652 | ---------------- | |
4653 | -- Model_Emin -- | |
4654 | ---------------- | |
4655 | ||
4656 | when Attribute_Model_Emin => | |
4657 | Check_Floating_Point_Type_0; | |
4658 | Set_Etype (N, Universal_Integer); | |
4659 | ||
4660 | ------------------- | |
4661 | -- Model_Epsilon -- | |
4662 | ------------------- | |
4663 | ||
4664 | when Attribute_Model_Epsilon => | |
4665 | Check_Floating_Point_Type_0; | |
4666 | Set_Etype (N, Universal_Real); | |
4667 | ||
4668 | -------------------- | |
4669 | -- Model_Mantissa -- | |
4670 | -------------------- | |
4671 | ||
4672 | when Attribute_Model_Mantissa => | |
4673 | Check_Floating_Point_Type_0; | |
4674 | Set_Etype (N, Universal_Integer); | |
4675 | ||
4676 | ----------------- | |
4677 | -- Model_Small -- | |
4678 | ----------------- | |
4679 | ||
4680 | when Attribute_Model_Small => | |
4681 | Check_Floating_Point_Type_0; | |
4682 | Set_Etype (N, Universal_Real); | |
4683 | ||
4684 | ------------- | |
4685 | -- Modulus -- | |
4686 | ------------- | |
4687 | ||
4688 | when Attribute_Modulus => | |
4689 | Check_E0; | |
5f3ab6fb | 4690 | Check_Modular_Integer_Type; |
996ae0b0 RK |
4691 | Set_Etype (N, Universal_Integer); |
4692 | ||
4693 | -------------------- | |
4694 | -- Null_Parameter -- | |
4695 | -------------------- | |
4696 | ||
4697 | when Attribute_Null_Parameter => Null_Parameter : declare | |
4698 | Parnt : constant Node_Id := Parent (N); | |
4699 | GParnt : constant Node_Id := Parent (Parnt); | |
4700 | ||
4701 | procedure Bad_Null_Parameter (Msg : String); | |
4702 | -- Used if bad Null parameter attribute node is found. Issues | |
4703 | -- given error message, and also sets the type to Any_Type to | |
4704 | -- avoid blowups later on from dealing with a junk node. | |
4705 | ||
4706 | procedure Must_Be_Imported (Proc_Ent : Entity_Id); | |
4707 | -- Called to check that Proc_Ent is imported subprogram | |
4708 | ||
4709 | ------------------------ | |
4710 | -- Bad_Null_Parameter -- | |
4711 | ------------------------ | |
4712 | ||
4713 | procedure Bad_Null_Parameter (Msg : String) is | |
4714 | begin | |
4715 | Error_Msg_N (Msg, N); | |
4716 | Set_Etype (N, Any_Type); | |
4717 | end Bad_Null_Parameter; | |
4718 | ||
4719 | ---------------------- | |
4720 | -- Must_Be_Imported -- | |
4721 | ---------------------- | |
4722 | ||
4723 | procedure Must_Be_Imported (Proc_Ent : Entity_Id) is | |
b81a5940 | 4724 | Pent : constant Entity_Id := Ultimate_Alias (Proc_Ent); |
996ae0b0 RK |
4725 | |
4726 | begin | |
996ae0b0 RK |
4727 | -- Ignore check if procedure not frozen yet (we will get |
4728 | -- another chance when the default parameter is reanalyzed) | |
4729 | ||
4730 | if not Is_Frozen (Pent) then | |
4731 | return; | |
4732 | ||
4733 | elsif not Is_Imported (Pent) then | |
4734 | Bad_Null_Parameter | |
4735 | ("Null_Parameter can only be used with imported subprogram"); | |
4736 | ||
4737 | else | |
4738 | return; | |
4739 | end if; | |
4740 | end Must_Be_Imported; | |
4741 | ||
4742 | -- Start of processing for Null_Parameter | |
4743 | ||
4744 | begin | |
4745 | Check_Type; | |
4746 | Check_E0; | |
4747 | Set_Etype (N, P_Type); | |
4748 | ||
4749 | -- Case of attribute used as default expression | |
4750 | ||
4751 | if Nkind (Parnt) = N_Parameter_Specification then | |
4752 | Must_Be_Imported (Defining_Entity (GParnt)); | |
4753 | ||
4754 | -- Case of attribute used as actual for subprogram (positional) | |
4755 | ||
d3b00ce3 | 4756 | elsif Nkind (Parnt) in N_Subprogram_Call |
996ae0b0 RK |
4757 | and then Is_Entity_Name (Name (Parnt)) |
4758 | then | |
4759 | Must_Be_Imported (Entity (Name (Parnt))); | |
4760 | ||
4761 | -- Case of attribute used as actual for subprogram (named) | |
4762 | ||
4763 | elsif Nkind (Parnt) = N_Parameter_Association | |
d3b00ce3 | 4764 | and then Nkind (GParnt) in N_Subprogram_Call |
996ae0b0 RK |
4765 | and then Is_Entity_Name (Name (GParnt)) |
4766 | then | |
4767 | Must_Be_Imported (Entity (Name (GParnt))); | |
4768 | ||
4769 | -- Not an allowed case | |
4770 | ||
4771 | else | |
4772 | Bad_Null_Parameter | |
4773 | ("Null_Parameter must be actual or default parameter"); | |
4774 | end if; | |
996ae0b0 RK |
4775 | end Null_Parameter; |
4776 | ||
4777 | ----------------- | |
4778 | -- Object_Size -- | |
4779 | ----------------- | |
4780 | ||
4781 | when Attribute_Object_Size => | |
4782 | Check_E0; | |
4783 | Check_Type; | |
4784 | Check_Not_Incomplete_Type; | |
4785 | Set_Etype (N, Universal_Integer); | |
4786 | ||
e10dab7f JM |
4787 | --------- |
4788 | -- Old -- | |
4789 | --------- | |
4790 | ||
8a0320ad | 4791 | when Attribute_Old => Old : declare |
2c9f8c0a AC |
4792 | procedure Check_References_In_Prefix (Subp_Id : Entity_Id); |
4793 | -- Inspect the contents of the prefix and detect illegal uses of a | |
4794 | -- nested 'Old, attribute 'Result or a use of an entity declared in | |
4795 | -- the related postcondition expression. Subp_Id is the subprogram to | |
4796 | -- which the related postcondition applies. | |
4797 | ||
2c9f8c0a AC |
4798 | -------------------------------- |
4799 | -- Check_References_In_Prefix -- | |
4800 | -------------------------------- | |
4801 | ||
4802 | procedure Check_References_In_Prefix (Subp_Id : Entity_Id) is | |
4803 | function Check_Reference (Nod : Node_Id) return Traverse_Result; | |
4804 | -- Detect attribute 'Old, attribute 'Result of a use of an entity | |
4805 | -- and perform the appropriate semantic check. | |
4806 | ||
4807 | --------------------- | |
4808 | -- Check_Reference -- | |
4809 | --------------------- | |
4810 | ||
4811 | function Check_Reference (Nod : Node_Id) return Traverse_Result is | |
4812 | begin | |
4813 | -- Attributes 'Old and 'Result cannot appear in the prefix of | |
4814 | -- another attribute 'Old. | |
4815 | ||
4816 | if Nkind (Nod) = N_Attribute_Reference | |
4817 | and then Nam_In (Attribute_Name (Nod), Name_Old, | |
4818 | Name_Result) | |
4819 | then | |
4820 | Error_Msg_Name_1 := Attribute_Name (Nod); | |
4821 | Error_Msg_Name_2 := Name_Old; | |
4822 | Error_Msg_N | |
4823 | ("attribute % cannot appear in the prefix of attribute %", | |
4824 | Nod); | |
4825 | return Abandon; | |
4826 | ||
4827 | -- Entities mentioned within the prefix of attribute 'Old must | |
4828 | -- be global to the related postcondition. If this is not the | |
e0f63680 | 4829 | -- case, then the scope of the local entity is nested within |
2c9f8c0a AC |
4830 | -- that of the subprogram. |
4831 | ||
b6a56408 | 4832 | elsif Is_Entity_Name (Nod) |
2c9f8c0a AC |
4833 | and then Present (Entity (Nod)) |
4834 | and then Scope_Within (Scope (Entity (Nod)), Subp_Id) | |
4835 | then | |
4836 | Error_Attr | |
4837 | ("prefix of attribute % cannot reference local entities", | |
4838 | Nod); | |
4839 | return Abandon; | |
b6a56408 AC |
4840 | |
4841 | -- Otherwise keep inspecting the prefix | |
4842 | ||
2c9f8c0a AC |
4843 | else |
4844 | return OK; | |
4845 | end if; | |
4846 | end Check_Reference; | |
4847 | ||
4848 | procedure Check_References is new Traverse_Proc (Check_Reference); | |
4849 | ||
4850 | -- Start of processing for Check_References_In_Prefix | |
4851 | ||
4852 | begin | |
4853 | Check_References (P); | |
4854 | end Check_References_In_Prefix; | |
4855 | ||
2c9f8c0a AC |
4856 | -- Local variables |
4857 | ||
b6a56408 AC |
4858 | Legal : Boolean; |
4859 | Pref_Id : Entity_Id; | |
4860 | Pref_Typ : Entity_Id; | |
4861 | Spec_Id : Entity_Id; | |
8a0320ad | 4862 | |
2c9f8c0a AC |
4863 | -- Start of processing for Old |
4864 | ||
8a0320ad | 4865 | begin |
b6a56408 AC |
4866 | -- The attribute reference is a primary. If any expressions follow, |
4867 | -- then the attribute reference is an indexable object. Transform the | |
4868 | -- attribute into an indexed component and analyze it. | |
8a0320ad | 4869 | |
b6a56408 AC |
4870 | if Present (E1) then |
4871 | Rewrite (N, | |
4872 | Make_Indexed_Component (Loc, | |
4873 | Prefix => | |
4874 | Make_Attribute_Reference (Loc, | |
4875 | Prefix => Relocate_Node (P), | |
4876 | Attribute_Name => Name_Old), | |
4877 | Expressions => Expressions (N))); | |
4878 | Analyze (N); | |
4879 | return; | |
4880 | end if; | |
26df19ce | 4881 | |
b6a56408 | 4882 | Analyze_Attribute_Old_Result (Legal, Spec_Id); |
48b0da2d | 4883 | |
b6a56408 AC |
4884 | -- The aspect or pragma where attribute 'Old resides should be |
4885 | -- associated with a subprogram declaration or a body. If this is not | |
4886 | -- the case, then the aspect or pragma is illegal. Return as analysis | |
4887 | -- cannot be carried out. | |
48b0da2d | 4888 | |
64f5d139 JM |
4889 | -- The exception to this rule is when generating C since in this case |
4890 | -- postconditions are inlined. | |
4891 | ||
4892 | if No (Spec_Id) | |
4893 | and then Modify_Tree_For_C | |
4894 | and then In_Inlined_Body | |
4895 | then | |
4896 | Spec_Id := Entity (P); | |
4897 | ||
4898 | elsif not Legal then | |
48b0da2d | 4899 | return; |
b6a56408 | 4900 | end if; |
48b0da2d | 4901 | |
b6a56408 AC |
4902 | -- The prefix must be preanalyzed as the full analysis will take |
4903 | -- place during expansion. | |
f40f731b | 4904 | |
b6a56408 | 4905 | Preanalyze_And_Resolve (P); |
f40f731b | 4906 | |
b6a56408 | 4907 | -- Ensure that the prefix does not contain attributes 'Old or 'Result |
36eef04a | 4908 | |
b6a56408 | 4909 | Check_References_In_Prefix (Spec_Id); |
8a0320ad | 4910 | |
b6a56408 | 4911 | -- Set the type of the attribute now to prevent cascaded errors |
2eb87017 | 4912 | |
b6a56408 AC |
4913 | Pref_Typ := Etype (P); |
4914 | Set_Etype (N, Pref_Typ); | |
36eef04a | 4915 | |
b6a56408 | 4916 | -- Legality checks |
2eb87017 | 4917 | |
b6a56408 AC |
4918 | if Is_Limited_Type (Pref_Typ) then |
4919 | Error_Attr ("attribute % cannot apply to limited objects", P); | |
4920 | end if; | |
2c9f8c0a | 4921 | |
b6a56408 | 4922 | -- The prefix is a simple name |
8a0320ad | 4923 | |
b6a56408 AC |
4924 | if Is_Entity_Name (P) and then Present (Entity (P)) then |
4925 | Pref_Id := Entity (P); | |
8a0320ad | 4926 | |
b6a56408 AC |
4927 | -- Emit a warning when the prefix is a constant. Note that the use |
4928 | -- of Error_Attr would reset the type of N to Any_Type even though | |
4929 | -- this is a warning. Use Error_Msg_XXX instead. | |
8a0320ad | 4930 | |
b6a56408 AC |
4931 | if Is_Constant_Object (Pref_Id) then |
4932 | Error_Msg_Name_1 := Name_Old; | |
4933 | Error_Msg_N | |
26f36fc9 | 4934 | ("??attribute % applied to constant has no effect", P); |
8a0320ad | 4935 | end if; |
8a0320ad | 4936 | |
b6a56408 | 4937 | -- Otherwise the prefix is not a simple name |
229db351 | 4938 | |
b6a56408 AC |
4939 | else |
4940 | -- Ensure that the prefix of attribute 'Old is an entity when it | |
4941 | -- is potentially unevaluated (6.1.1 (27/3)). | |
d2b4b3da | 4942 | |
b6a56408 AC |
4943 | if Is_Potentially_Unevaluated (N) then |
4944 | Uneval_Old_Msg; | |
d2b4b3da | 4945 | |
b6a56408 AC |
4946 | -- Detect a possible infinite recursion when the prefix denotes |
4947 | -- the related function. | |
e10dab7f | 4948 | |
b6a56408 AC |
4949 | -- function Func (...) return ... |
4950 | -- with Post => Func'Old ...; | |
71a555b3 | 4951 | |
08f52d9f AC |
4952 | -- The function may be specified in qualified form X.Y where X is |
4953 | -- a protected object and Y is a protected function. In that case | |
4954 | -- ensure that the qualified form has an entity. | |
4955 | ||
4956 | elsif Nkind (P) = N_Function_Call | |
4957 | and then Nkind (Name (P)) in N_Has_Entity | |
4958 | then | |
b6a56408 | 4959 | Pref_Id := Entity (Name (P)); |
c733429f | 4960 | |
b6a56408 AC |
4961 | if Ekind_In (Spec_Id, E_Function, E_Generic_Function) |
4962 | and then Pref_Id = Spec_Id | |
4963 | then | |
4964 | Error_Msg_Warn := SPARK_Mode /= On; | |
4965 | Error_Msg_N ("!possible infinite recursion<<", P); | |
4966 | Error_Msg_N ("\!??Storage_Error ]<<", P); | |
4967 | end if; | |
4968 | end if; | |
c733429f | 4969 | |
b6a56408 AC |
4970 | -- The prefix of attribute 'Old may refer to a component of a |
4971 | -- formal parameter. In this case its expansion may generate | |
4972 | -- actual subtypes that are referenced in an inner context and | |
4973 | -- that must be elaborated within the subprogram itself. If the | |
4974 | -- prefix includes a function call, it may involve finalization | |
4975 | -- actions that should be inserted when the attribute has been | |
4976 | -- rewritten as a declaration. Create a declaration for the prefix | |
4977 | -- and insert it at the start of the enclosing subprogram. This is | |
4978 | -- an expansion activity that has to be performed now to prevent | |
4979 | -- out-of-order issues. | |
4980 | ||
4981 | -- This expansion is both harmful and not needed in SPARK mode, | |
4982 | -- since the formal verification backend relies on the types of | |
4983 | -- nodes (hence is not robust w.r.t. a change to base type here), | |
4984 | -- and does not suffer from the out-of-order issue described | |
4985 | -- above. Thus, this expansion is skipped in SPARK mode. | |
4986 | ||
2cc2e964 AC |
4987 | -- The expansion is not relevant for discrete types, which will |
4988 | -- not generate extra declarations, and where use of the base type | |
4989 | -- may lead to spurious errors if context is a case. | |
3ba1a9eb | 4990 | |
b6a56408 | 4991 | if not GNATprove_Mode then |
3ba1a9eb AC |
4992 | if not Is_Discrete_Type (Pref_Typ) then |
4993 | Pref_Typ := Base_Type (Pref_Typ); | |
4994 | end if; | |
4995 | ||
b6a56408 AC |
4996 | Set_Etype (N, Pref_Typ); |
4997 | Set_Etype (P, Pref_Typ); | |
4998 | ||
4999 | Analyze_Dimension (N); | |
5000 | Expand (N); | |
5001 | end if; | |
d2b4b3da | 5002 | end if; |
8a0320ad | 5003 | end Old; |
d2b4b3da | 5004 | |
2d42e881 ES |
5005 | ---------------------- |
5006 | -- Overlaps_Storage -- | |
5007 | ---------------------- | |
5008 | ||
5009 | when Attribute_Overlaps_Storage => | |
5010 | Check_E1; | |
5011 | ||
5012 | -- Both arguments must be objects of any type | |
5013 | ||
5014 | Analyze_And_Resolve (P); | |
5015 | Analyze_And_Resolve (E1); | |
5016 | Check_Object_Reference (P); | |
5017 | Check_Object_Reference (E1); | |
5018 | Set_Etype (N, Standard_Boolean); | |
5019 | ||
996ae0b0 RK |
5020 | ------------ |
5021 | -- Output -- | |
5022 | ------------ | |
5023 | ||
5024 | when Attribute_Output => | |
5025 | Check_E2; | |
fbf5a39b | 5026 | Check_Stream_Attribute (TSS_Stream_Output); |
996ae0b0 | 5027 | Set_Etype (N, Standard_Void_Type); |
996ae0b0 RK |
5028 | Resolve (N, Standard_Void_Type); |
5029 | ||
5030 | ------------------ | |
5031 | -- Partition_ID -- | |
5032 | ------------------ | |
5033 | ||
e10dab7f JM |
5034 | when Attribute_Partition_ID => Partition_Id : |
5035 | begin | |
996ae0b0 RK |
5036 | Check_E0; |
5037 | ||
5038 | if P_Type /= Any_Type then | |
5039 | if not Is_Library_Level_Entity (Entity (P)) then | |
822033eb HK |
5040 | Error_Attr_P |
5041 | ("prefix of % attribute must be library-level entity"); | |
996ae0b0 | 5042 | |
e10dab7f JM |
5043 | -- The defining entity of prefix should not be declared inside a |
5044 | -- Pure unit. RM E.1(8). Is_Pure was set during declaration. | |
996ae0b0 RK |
5045 | |
5046 | elsif Is_Entity_Name (P) | |
5047 | and then Is_Pure (Entity (P)) | |
5048 | then | |
229db351 | 5049 | Error_Attr_P ("prefix of% attribute must not be declared pure"); |
996ae0b0 RK |
5050 | end if; |
5051 | end if; | |
5052 | ||
5053 | Set_Etype (N, Universal_Integer); | |
e10dab7f | 5054 | end Partition_Id; |
996ae0b0 RK |
5055 | |
5056 | ------------------------- | |
5057 | -- Passed_By_Reference -- | |
5058 | ------------------------- | |
5059 | ||
5060 | when Attribute_Passed_By_Reference => | |
5061 | Check_E0; | |
5062 | Check_Type; | |
5063 | Set_Etype (N, Standard_Boolean); | |
5064 | ||
fbf5a39b AC |
5065 | ------------------ |
5066 | -- Pool_Address -- | |
5067 | ------------------ | |
5068 | ||
5069 | when Attribute_Pool_Address => | |
5070 | Check_E0; | |
5071 | Set_Etype (N, RTE (RE_Address)); | |
5072 | ||
996ae0b0 RK |
5073 | --------- |
5074 | -- Pos -- | |
5075 | --------- | |
5076 | ||
5077 | when Attribute_Pos => | |
5078 | Check_Discrete_Type; | |
5079 | Check_E1; | |
7a489a2b AC |
5080 | |
5081 | if Is_Boolean_Type (P_Type) then | |
5082 | Error_Msg_Name_1 := Aname; | |
5083 | Error_Msg_Name_2 := Chars (P_Type); | |
ce5ba43a | 5084 | Check_SPARK_05_Restriction |
7a489a2b AC |
5085 | ("attribute% is not allowed for type%", P); |
5086 | end if; | |
5087 | ||
996ae0b0 RK |
5088 | Resolve (E1, P_Base_Type); |
5089 | Set_Etype (N, Universal_Integer); | |
5090 | ||
5091 | -------------- | |
5092 | -- Position -- | |
5093 | -------------- | |
5094 | ||
5095 | when Attribute_Position => | |
5096 | Check_Component; | |
5097 | Set_Etype (N, Universal_Integer); | |
5098 | ||
5099 | ---------- | |
5100 | -- Pred -- | |
5101 | ---------- | |
5102 | ||
5103 | when Attribute_Pred => | |
5104 | Check_Scalar_Type; | |
5105 | Check_E1; | |
7a489a2b AC |
5106 | |
5107 | if Is_Real_Type (P_Type) or else Is_Boolean_Type (P_Type) then | |
5108 | Error_Msg_Name_1 := Aname; | |
5109 | Error_Msg_Name_2 := Chars (P_Type); | |
ce5ba43a AC |
5110 | Check_SPARK_05_Restriction |
5111 | ("attribute% is not allowed for type%", P); | |
7a489a2b AC |
5112 | end if; |
5113 | ||
996ae0b0 RK |
5114 | Resolve (E1, P_Base_Type); |
5115 | Set_Etype (N, P_Base_Type); | |
5116 | ||
9ab5d86b RD |
5117 | -- Since Pred works on the base type, we normally do no check for the |
5118 | -- floating-point case, since the base type is unconstrained. But we | |
5119 | -- make an exception in Check_Float_Overflow mode. | |
996ae0b0 | 5120 | |
6cade1b0 | 5121 | if Is_Floating_Point_Type (P_Type) then |
d26d790d AC |
5122 | if not Range_Checks_Suppressed (P_Base_Type) then |
5123 | Set_Do_Range_Check (E1); | |
0083dd66 | 5124 | end if; |
996ae0b0 RK |
5125 | |
5126 | -- If not modular type, test for overflow check required | |
5127 | ||
5128 | else | |
5129 | if not Is_Modular_Integer_Type (P_Type) | |
5130 | and then not Range_Checks_Suppressed (P_Base_Type) | |
5131 | then | |
5132 | Enable_Range_Check (E1); | |
5133 | end if; | |
5134 | end if; | |
5135 | ||
468c6c8a ES |
5136 | -------------- |
5137 | -- Priority -- | |
5138 | -------------- | |
5139 | ||
5140 | -- Ada 2005 (AI-327): Dynamic ceiling priorities | |
5141 | ||
5142 | when Attribute_Priority => | |
0791fbe9 | 5143 | if Ada_Version < Ada_2005 then |
468c6c8a ES |
5144 | Error_Attr ("% attribute is allowed only in Ada 2005 mode", P); |
5145 | end if; | |
5146 | ||
5147 | Check_E0; | |
5148 | ||
5149 | -- The prefix must be a protected object (AARM D.5.2 (2/2)) | |
5150 | ||
5151 | Analyze (P); | |
5152 | ||
5153 | if Is_Protected_Type (Etype (P)) | |
5154 | or else (Is_Access_Type (Etype (P)) | |
5155 | and then Is_Protected_Type (Designated_Type (Etype (P)))) | |
5156 | then | |
5157 | Resolve (P, Etype (P)); | |
5158 | else | |
822033eb | 5159 | Error_Attr_P ("prefix of % attribute must be a protected object"); |
468c6c8a ES |
5160 | end if; |
5161 | ||
5162 | Set_Etype (N, Standard_Integer); | |
5163 | ||
5164 | -- Must be called from within a protected procedure or entry of the | |
5165 | -- protected object. | |
5166 | ||
5167 | declare | |
5168 | S : Entity_Id; | |
5169 | ||
5170 | begin | |
5171 | S := Current_Scope; | |
5172 | while S /= Etype (P) | |
5173 | and then S /= Standard_Standard | |
5174 | loop | |
5175 | S := Scope (S); | |
5176 | end loop; | |
5177 | ||
5178 | if S = Standard_Standard then | |
5179 | Error_Attr ("the attribute % is only allowed inside protected " | |
5180 | & "operations", P); | |
5181 | end if; | |
5182 | end; | |
5183 | ||
5184 | Validate_Non_Static_Attribute_Function_Call; | |
5185 | ||
996ae0b0 RK |
5186 | ----------- |
5187 | -- Range -- | |
5188 | ----------- | |
5189 | ||
5190 | when Attribute_Range => | |
5191 | Check_Array_Or_Scalar_Type; | |
26df19ce | 5192 | Bad_Attribute_For_Predicate; |
996ae0b0 | 5193 | |
0ab80019 | 5194 | if Ada_Version = Ada_83 |
996ae0b0 RK |
5195 | and then Is_Scalar_Type (P_Type) |
5196 | and then Comes_From_Source (N) | |
5197 | then | |
5198 | Error_Attr | |
5199 | ("(Ada 83) % attribute not allowed for scalar type", P); | |
5200 | end if; | |
5201 | ||
21d27997 RD |
5202 | ------------ |
5203 | -- Result -- | |
5204 | ------------ | |
5205 | ||
5206 | when Attribute_Result => Result : declare | |
7c76aa3f HK |
5207 | function Denote_Same_Function |
5208 | (Pref_Id : Entity_Id; | |
5209 | Spec_Id : Entity_Id) return Boolean; | |
5210 | -- Determine whether the entity of the prefix Pref_Id denotes the | |
5211 | -- same entity as that of the related subprogram Spec_Id. | |
5212 | ||
7c76aa3f HK |
5213 | -------------------------- |
5214 | -- Denote_Same_Function -- | |
5215 | -------------------------- | |
5216 | ||
5217 | function Denote_Same_Function | |
5218 | (Pref_Id : Entity_Id; | |
5219 | Spec_Id : Entity_Id) return Boolean | |
5220 | is | |
4afcf3a5 AC |
5221 | Over_Id : constant Entity_Id := Overridden_Operation (Spec_Id); |
5222 | Subp_Spec : constant Node_Id := Parent (Spec_Id); | |
7c76aa3f HK |
5223 | |
5224 | begin | |
5225 | -- The prefix denotes the related subprogram | |
5226 | ||
5227 | if Pref_Id = Spec_Id then | |
5228 | return True; | |
5229 | ||
5230 | -- Account for a special case when attribute 'Result appears in | |
5231 | -- the postcondition of a generic function. | |
5232 | ||
5233 | -- generic | |
5234 | -- function Gen_Func return ... | |
5235 | -- with Post => Gen_Func'Result ...; | |
5236 | ||
5237 | -- When the generic function is instantiated, the Chars field of | |
5238 | -- the instantiated prefix still denotes the name of the generic | |
5239 | -- function. Note that any preemptive transformation is impossible | |
5240 | -- without a proper analysis. The structure of the wrapper package | |
5241 | -- is as follows: | |
5242 | ||
5243 | -- package Anon_Gen_Pack is | |
5244 | -- <subtypes and renamings> | |
5245 | -- function Subp_Decl return ...; -- (!) | |
5246 | -- pragma Postcondition (Gen_Func'Result ...); -- (!) | |
5247 | -- function Gen_Func ... renames Subp_Decl; | |
5248 | -- end Anon_Gen_Pack; | |
5249 | ||
5250 | elsif Nkind (Subp_Spec) = N_Function_Specification | |
5251 | and then Present (Generic_Parent (Subp_Spec)) | |
caf07df9 | 5252 | and then Ekind_In (Pref_Id, E_Generic_Function, E_Function) |
7c76aa3f | 5253 | then |
caf07df9 AC |
5254 | if Generic_Parent (Subp_Spec) = Pref_Id then |
5255 | return True; | |
5256 | ||
5257 | elsif Present (Alias (Pref_Id)) | |
5258 | and then Alias (Pref_Id) = Spec_Id | |
5259 | then | |
5260 | return True; | |
5261 | end if; | |
4afcf3a5 AC |
5262 | |
5263 | -- Account for a special case where a primitive of a tagged type | |
5264 | -- inherits a class-wide postcondition from a parent type. In this | |
5265 | -- case the prefix of attribute 'Result denotes the overriding | |
5266 | -- primitive. | |
5267 | ||
5268 | elsif Present (Over_Id) and then Pref_Id = Over_Id then | |
5269 | return True; | |
caf07df9 | 5270 | end if; |
7c76aa3f HK |
5271 | |
5272 | -- Otherwise the prefix does not denote the related subprogram | |
5273 | ||
caf07df9 | 5274 | return False; |
7c76aa3f HK |
5275 | end Denote_Same_Function; |
5276 | ||
c9d70ab1 | 5277 | -- Local variables |
f40f731b | 5278 | |
b6a56408 AC |
5279 | Legal : Boolean; |
5280 | Pref_Id : Entity_Id; | |
5281 | Spec_Id : Entity_Id; | |
36eef04a | 5282 | |
c9d70ab1 | 5283 | -- Start of processing for Result |
dac3bede | 5284 | |
c9d70ab1 AC |
5285 | begin |
5286 | -- The attribute reference is a primary. If any expressions follow, | |
5287 | -- then the attribute reference is an indexable object. Transform the | |
5288 | -- attribute into an indexed component and analyze it. | |
dac3bede | 5289 | |
c9d70ab1 AC |
5290 | if Present (E1) then |
5291 | Rewrite (N, | |
5292 | Make_Indexed_Component (Loc, | |
5293 | Prefix => | |
5294 | Make_Attribute_Reference (Loc, | |
5295 | Prefix => Relocate_Node (P), | |
5296 | Attribute_Name => Name_Result), | |
5297 | Expressions => Expressions (N))); | |
5298 | Analyze (N); | |
5299 | return; | |
5300 | end if; | |
36eef04a | 5301 | |
b6a56408 | 5302 | Analyze_Attribute_Old_Result (Legal, Spec_Id); |
21d27997 | 5303 | |
b6a56408 AC |
5304 | -- The aspect or pragma where attribute 'Result resides should be |
5305 | -- associated with a subprogram declaration or a body. If this is not | |
5306 | -- the case, then the aspect or pragma is illegal. Return as analysis | |
5307 | -- cannot be carried out. | |
7c76aa3f | 5308 | |
64f5d139 JM |
5309 | -- The exception to this rule is when generating C since in this case |
5310 | -- postconditions are inlined. | |
5311 | ||
5312 | if No (Spec_Id) | |
5313 | and then Modify_Tree_For_C | |
5314 | and then In_Inlined_Body | |
5315 | then | |
5316 | Spec_Id := Entity (P); | |
5317 | ||
5318 | elsif not Legal then | |
7c76aa3f HK |
5319 | return; |
5320 | end if; | |
a905304c | 5321 | |
7c76aa3f HK |
5322 | -- Attribute 'Result is part of a _Postconditions procedure. There is |
5323 | -- no need to perform the semantic checks below as they were already | |
5324 | -- verified when the attribute was analyzed in its original context. | |
5325 | -- Instead, rewrite the attribute as a reference to formal parameter | |
5326 | -- _Result of the _Postconditions procedure. | |
e7f23f06 | 5327 | |
7c76aa3f HK |
5328 | if Chars (Spec_Id) = Name_uPostconditions then |
5329 | Rewrite (N, Make_Identifier (Loc, Name_uResult)); | |
a905304c | 5330 | |
7c76aa3f HK |
5331 | -- The type of formal parameter _Result is that of the function |
5332 | -- encapsulating the _Postconditions procedure. Resolution must | |
5333 | -- be carried out against the function return type. | |
e7f23f06 | 5334 | |
7c76aa3f | 5335 | Analyze_And_Resolve (N, Etype (Scope (Spec_Id))); |
e7f23f06 | 5336 | |
7c76aa3f HK |
5337 | -- Otherwise attribute 'Result appears in its original context and |
5338 | -- all semantic checks should be carried out. | |
21d27997 | 5339 | |
7c76aa3f HK |
5340 | else |
5341 | -- Verify the legality of the prefix. It must denotes the entity | |
5342 | -- of the related [generic] function. | |
c9d70ab1 AC |
5343 | |
5344 | if Is_Entity_Name (P) then | |
5345 | Pref_Id := Entity (P); | |
5346 | ||
3386e3ae AC |
5347 | if Ekind_In (Pref_Id, E_Function, E_Generic_Function) |
5348 | and then Ekind (Spec_Id) = Ekind (Pref_Id) | |
5349 | then | |
7c76aa3f | 5350 | if Denote_Same_Function (Pref_Id, Spec_Id) then |
caf07df9 AC |
5351 | |
5352 | -- Correct the prefix of the attribute when the context | |
5353 | -- is a generic function. | |
5354 | ||
5355 | if Pref_Id /= Spec_Id then | |
5356 | Rewrite (P, New_Occurrence_Of (Spec_Id, Loc)); | |
5357 | Analyze (P); | |
5358 | end if; | |
5359 | ||
7c76aa3f | 5360 | Set_Etype (N, Etype (Spec_Id)); |
8d9509fd | 5361 | |
7c76aa3f | 5362 | -- Otherwise the prefix denotes some unrelated function |
c9d70ab1 | 5363 | |
7c76aa3f HK |
5364 | else |
5365 | Error_Msg_Name_2 := Chars (Spec_Id); | |
5366 | Error_Attr | |
b6a56408 | 5367 | ("incorrect prefix for attribute %, expected %", P); |
c9d70ab1 AC |
5368 | end if; |
5369 | ||
7c76aa3f HK |
5370 | -- Otherwise the prefix denotes some other form of subprogram |
5371 | -- entity. | |
21d27997 | 5372 | |
8d9509fd | 5373 | else |
e7f23f06 | 5374 | Error_Attr |
b6a56408 | 5375 | ("attribute % can only appear in postcondition of " |
c9d70ab1 | 5376 | & "function", P); |
8d9509fd | 5377 | end if; |
21d27997 | 5378 | |
c9d70ab1 AC |
5379 | -- Otherwise the prefix is illegal |
5380 | ||
5381 | else | |
5382 | Error_Msg_Name_2 := Chars (Spec_Id); | |
b6a56408 | 5383 | Error_Attr ("incorrect prefix for attribute %, expected %", P); |
c9d70ab1 | 5384 | end if; |
21d27997 RD |
5385 | end if; |
5386 | end Result; | |
5387 | ||
996ae0b0 RK |
5388 | ------------------ |
5389 | -- Range_Length -- | |
5390 | ------------------ | |
5391 | ||
5392 | when Attribute_Range_Length => | |
e10dab7f | 5393 | Check_E0; |
996ae0b0 RK |
5394 | Check_Discrete_Type; |
5395 | Set_Etype (N, Universal_Integer); | |
5396 | ||
5397 | ---------- | |
5398 | -- Read -- | |
5399 | ---------- | |
5400 | ||
5401 | when Attribute_Read => | |
5402 | Check_E2; | |
fbf5a39b | 5403 | Check_Stream_Attribute (TSS_Stream_Read); |
996ae0b0 RK |
5404 | Set_Etype (N, Standard_Void_Type); |
5405 | Resolve (N, Standard_Void_Type); | |
21d27997 | 5406 | Note_Possible_Modification (E2, Sure => True); |
996ae0b0 | 5407 | |
1b0b0f18 AC |
5408 | --------- |
5409 | -- Ref -- | |
5410 | --------- | |
5411 | ||
5412 | when Attribute_Ref => | |
5413 | Check_E1; | |
5414 | Analyze (P); | |
5415 | ||
5416 | if Nkind (P) /= N_Expanded_Name | |
5417 | or else not Is_RTE (P_Type, RE_Address) | |
5418 | then | |
5419 | Error_Attr_P ("prefix of % attribute must be System.Address"); | |
5420 | end if; | |
5421 | ||
5422 | Analyze_And_Resolve (E1, Any_Integer); | |
5423 | Set_Etype (N, RTE (RE_Address)); | |
5424 | ||
996ae0b0 RK |
5425 | --------------- |
5426 | -- Remainder -- | |
5427 | --------------- | |
5428 | ||
5429 | when Attribute_Remainder => | |
5430 | Check_Floating_Point_Type_2; | |
5431 | Set_Etype (N, P_Base_Type); | |
5432 | Resolve (E1, P_Base_Type); | |
5433 | Resolve (E2, P_Base_Type); | |
5434 | ||
2cbac6c6 AC |
5435 | --------------------- |
5436 | -- Restriction_Set -- | |
5437 | --------------------- | |
5438 | ||
5439 | when Attribute_Restriction_Set => Restriction_Set : declare | |
5440 | R : Restriction_Id; | |
5441 | U : Node_Id; | |
5442 | Unam : Unit_Name_Type; | |
5443 | ||
2cbac6c6 AC |
5444 | begin |
5445 | Check_E1; | |
5446 | Analyze (P); | |
f7ea2603 | 5447 | Check_System_Prefix; |
2cbac6c6 AC |
5448 | |
5449 | -- No_Dependence case | |
5450 | ||
5451 | if Nkind (E1) = N_Parameter_Association then | |
5452 | pragma Assert (Chars (Selector_Name (E1)) = Name_No_Dependence); | |
5453 | U := Explicit_Actual_Parameter (E1); | |
5454 | ||
5455 | if not OK_No_Dependence_Unit_Name (U) then | |
f7ea2603 | 5456 | Set_Boolean_Result (N, False); |
2cbac6c6 AC |
5457 | Error_Attr; |
5458 | end if; | |
5459 | ||
5460 | -- See if there is an entry already in the table. That's the | |
5461 | -- case in which we can return True. | |
5462 | ||
5463 | for J in No_Dependences.First .. No_Dependences.Last loop | |
5464 | if Designate_Same_Unit (U, No_Dependences.Table (J).Unit) | |
5465 | and then No_Dependences.Table (J).Warn = False | |
5466 | then | |
f7ea2603 | 5467 | Set_Boolean_Result (N, True); |
2cbac6c6 AC |
5468 | return; |
5469 | end if; | |
5470 | end loop; | |
5471 | ||
5472 | -- If not in the No_Dependence table, result is False | |
5473 | ||
f7ea2603 | 5474 | Set_Boolean_Result (N, False); |
2cbac6c6 AC |
5475 | |
5476 | -- In this case, we must ensure that the binder will reject any | |
5477 | -- other unit in the partition that sets No_Dependence for this | |
5478 | -- unit. We do that by making an entry in the special table kept | |
5479 | -- for this purpose (if the entry is not there already). | |
5480 | ||
5481 | Unam := Get_Spec_Name (Get_Unit_Name (U)); | |
5482 | ||
5483 | for J in Restriction_Set_Dependences.First .. | |
5484 | Restriction_Set_Dependences.Last | |
5485 | loop | |
5486 | if Restriction_Set_Dependences.Table (J) = Unam then | |
5487 | return; | |
5488 | end if; | |
5489 | end loop; | |
5490 | ||
5491 | Restriction_Set_Dependences.Append (Unam); | |
5492 | ||
5493 | -- Normal restriction case | |
5494 | ||
5495 | else | |
5496 | if Nkind (E1) /= N_Identifier then | |
f7ea2603 | 5497 | Set_Boolean_Result (N, False); |
2cbac6c6 AC |
5498 | Error_Attr ("attribute % requires restriction identifier", E1); |
5499 | ||
5500 | else | |
5501 | R := Get_Restriction_Id (Process_Restriction_Synonyms (E1)); | |
5502 | ||
5503 | if R = Not_A_Restriction_Id then | |
f7ea2603 | 5504 | Set_Boolean_Result (N, False); |
2cbac6c6 AC |
5505 | Error_Msg_Node_1 := E1; |
5506 | Error_Attr ("invalid restriction identifier &", E1); | |
5507 | ||
5508 | elsif R not in Partition_Boolean_Restrictions then | |
f7ea2603 | 5509 | Set_Boolean_Result (N, False); |
2cbac6c6 AC |
5510 | Error_Msg_Node_1 := E1; |
5511 | Error_Attr | |
5512 | ("& is not a boolean partition-wide restriction", E1); | |
5513 | end if; | |
5514 | ||
5515 | if Restriction_Active (R) then | |
f7ea2603 | 5516 | Set_Boolean_Result (N, True); |
2cbac6c6 AC |
5517 | else |
5518 | Check_Restriction (R, N); | |
f7ea2603 | 5519 | Set_Boolean_Result (N, False); |
2cbac6c6 AC |
5520 | end if; |
5521 | end if; | |
5522 | end if; | |
5523 | end Restriction_Set; | |
5524 | ||
996ae0b0 RK |
5525 | ----------- |
5526 | -- Round -- | |
5527 | ----------- | |
5528 | ||
5529 | when Attribute_Round => | |
5530 | Check_E1; | |
5531 | Check_Decimal_Fixed_Point_Type; | |
5532 | Set_Etype (N, P_Base_Type); | |
5533 | ||
29ba9f52 RD |
5534 | -- Because the context is universal_real (3.5.10(12)) it is a |
5535 | -- legal context for a universal fixed expression. This is the | |
5536 | -- only attribute whose functional description involves U_R. | |
996ae0b0 RK |
5537 | |
5538 | if Etype (E1) = Universal_Fixed then | |
5539 | declare | |
5540 | Conv : constant Node_Id := Make_Type_Conversion (Loc, | |
5541 | Subtype_Mark => New_Occurrence_Of (Universal_Real, Loc), | |
5542 | Expression => Relocate_Node (E1)); | |
5543 | ||
5544 | begin | |
5545 | Rewrite (E1, Conv); | |
5546 | Analyze (E1); | |
5547 | end; | |
5548 | end if; | |
5549 | ||
5550 | Resolve (E1, Any_Real); | |
5551 | ||
5552 | -------------- | |
5553 | -- Rounding -- | |
5554 | -------------- | |
5555 | ||
5556 | when Attribute_Rounding => | |
5557 | Check_Floating_Point_Type_1; | |
5558 | Set_Etype (N, P_Base_Type); | |
5559 | Resolve (E1, P_Base_Type); | |
5560 | ||
5561 | --------------- | |
5562 | -- Safe_Emax -- | |
5563 | --------------- | |
5564 | ||
5565 | when Attribute_Safe_Emax => | |
5566 | Check_Floating_Point_Type_0; | |
5567 | Set_Etype (N, Universal_Integer); | |
5568 | ||
5569 | ---------------- | |
5570 | -- Safe_First -- | |
5571 | ---------------- | |
5572 | ||
5573 | when Attribute_Safe_First => | |
5574 | Check_Floating_Point_Type_0; | |
5575 | Set_Etype (N, Universal_Real); | |
5576 | ||
5577 | ---------------- | |
5578 | -- Safe_Large -- | |
5579 | ---------------- | |
5580 | ||
5581 | when Attribute_Safe_Large => | |
5582 | Check_E0; | |
5583 | Check_Real_Type; | |
5584 | Set_Etype (N, Universal_Real); | |
5585 | ||
5586 | --------------- | |
5587 | -- Safe_Last -- | |
5588 | --------------- | |
5589 | ||
5590 | when Attribute_Safe_Last => | |
5591 | Check_Floating_Point_Type_0; | |
5592 | Set_Etype (N, Universal_Real); | |
5593 | ||
5594 | ---------------- | |
5595 | -- Safe_Small -- | |
5596 | ---------------- | |
5597 | ||
5598 | when Attribute_Safe_Small => | |
5599 | Check_E0; | |
5600 | Check_Real_Type; | |
5601 | Set_Etype (N, Universal_Real); | |
5602 | ||
f91510fc AC |
5603 | -------------------------- |
5604 | -- Scalar_Storage_Order -- | |
5605 | -------------------------- | |
5606 | ||
5607 | when Attribute_Scalar_Storage_Order => Scalar_Storage_Order : | |
83553466 | 5608 | declare |
02bb0765 | 5609 | Ent : Entity_Id := Empty; |
15918371 | 5610 | |
f91510fc AC |
5611 | begin |
5612 | Check_E0; | |
5613 | Check_Type; | |
5614 | ||
83553466 AC |
5615 | if not (Is_Record_Type (P_Type) or else Is_Array_Type (P_Type)) then |
5616 | ||
5617 | -- In GNAT mode, the attribute applies to generic types as well | |
5618 | -- as composite types, and for non-composite types always returns | |
5619 | -- the default bit order for the target. | |
5620 | ||
5621 | if not (GNAT_Mode and then Is_Generic_Type (P_Type)) | |
02bb0765 | 5622 | and then not In_Instance |
83553466 AC |
5623 | then |
5624 | Error_Attr_P | |
5625 | ("prefix of % attribute must be record or array type"); | |
5626 | ||
5627 | elsif not Is_Generic_Type (P_Type) then | |
5628 | if Bytes_Big_Endian then | |
5629 | Ent := RTE (RE_High_Order_First); | |
5630 | else | |
5631 | Ent := RTE (RE_Low_Order_First); | |
5632 | end if; | |
5633 | end if; | |
5634 | ||
5635 | elsif Bytes_Big_Endian xor Reverse_Storage_Order (P_Type) then | |
5636 | Ent := RTE (RE_High_Order_First); | |
f91510fc | 5637 | |
f91510fc | 5638 | else |
83553466 AC |
5639 | Ent := RTE (RE_Low_Order_First); |
5640 | end if; | |
5641 | ||
5642 | if Present (Ent) then | |
5643 | Rewrite (N, New_Occurrence_Of (Ent, Loc)); | |
f91510fc AC |
5644 | end if; |
5645 | ||
5646 | Set_Etype (N, RTE (RE_Bit_Order)); | |
5647 | Resolve (N); | |
5648 | ||
5649 | -- Reset incorrect indication of staticness | |
5650 | ||
5651 | Set_Is_Static_Expression (N, False); | |
5652 | end Scalar_Storage_Order; | |
5653 | ||
996ae0b0 RK |
5654 | ----------- |
5655 | -- Scale -- | |
5656 | ----------- | |
5657 | ||
5658 | when Attribute_Scale => | |
5659 | Check_E0; | |
5660 | Check_Decimal_Fixed_Point_Type; | |
5661 | Set_Etype (N, Universal_Integer); | |
5662 | ||
5663 | ------------- | |
5664 | -- Scaling -- | |
5665 | ------------- | |
5666 | ||
5667 | when Attribute_Scaling => | |
5668 | Check_Floating_Point_Type_2; | |
5669 | Set_Etype (N, P_Base_Type); | |
5670 | Resolve (E1, P_Base_Type); | |
5671 | ||
5672 | ------------------ | |
5673 | -- Signed_Zeros -- | |
5674 | ------------------ | |
5675 | ||
5676 | when Attribute_Signed_Zeros => | |
5677 | Check_Floating_Point_Type_0; | |
5678 | Set_Etype (N, Standard_Boolean); | |
5679 | ||
5680 | ---------- | |
5681 | -- Size -- | |
5682 | ---------- | |
5683 | ||
e10dab7f JM |
5684 | when Attribute_Size | Attribute_VADS_Size => Size : |
5685 | begin | |
996ae0b0 RK |
5686 | Check_E0; |
5687 | ||
5d09245e AC |
5688 | -- If prefix is parameterless function call, rewrite and resolve |
5689 | -- as such. | |
5690 | ||
5691 | if Is_Entity_Name (P) | |
5692 | and then Ekind (Entity (P)) = E_Function | |
996ae0b0 | 5693 | then |
5d09245e AC |
5694 | Resolve (P); |
5695 | ||
5696 | -- Similar processing for a protected function call | |
5697 | ||
5698 | elsif Nkind (P) = N_Selected_Component | |
5699 | and then Ekind (Entity (Selector_Name (P))) = E_Function | |
5700 | then | |
5701 | Resolve (P); | |
5702 | end if; | |
5703 | ||
5704 | if Is_Object_Reference (P) then | |
996ae0b0 RK |
5705 | Check_Object_Reference (P); |
5706 | ||
0873bafc | 5707 | elsif Is_Entity_Name (P) |
c4e5e10f TQ |
5708 | and then (Is_Type (Entity (P)) |
5709 | or else Ekind (Entity (P)) = E_Enumeration_Literal) | |
996ae0b0 | 5710 | then |
0873bafc GB |
5711 | null; |
5712 | ||
5713 | elsif Nkind (P) = N_Type_Conversion | |
5714 | and then not Comes_From_Source (P) | |
5715 | then | |
5716 | null; | |
5717 | ||
5b75bf57 AC |
5718 | -- Some other compilers allow dubious use of X'???'Size |
5719 | ||
303fbb20 AC |
5720 | elsif Relaxed_RM_Semantics |
5721 | and then Nkind (P) = N_Attribute_Reference | |
5722 | then | |
5723 | null; | |
5724 | ||
0873bafc | 5725 | else |
822033eb | 5726 | Error_Attr_P ("invalid prefix for % attribute"); |
996ae0b0 RK |
5727 | end if; |
5728 | ||
5729 | Check_Not_Incomplete_Type; | |
21d27997 | 5730 | Check_Not_CPP_Type; |
996ae0b0 | 5731 | Set_Etype (N, Universal_Integer); |
e10dab7f | 5732 | end Size; |
996ae0b0 RK |
5733 | |
5734 | ----------- | |
5735 | -- Small -- | |
5736 | ----------- | |
5737 | ||
5738 | when Attribute_Small => | |
5739 | Check_E0; | |
5740 | Check_Real_Type; | |
5741 | Set_Etype (N, Universal_Real); | |
5742 | ||
5743 | ------------------ | |
5744 | -- Storage_Pool -- | |
5745 | ------------------ | |
5746 | ||
a8551b5f AC |
5747 | when Attribute_Storage_Pool | |
5748 | Attribute_Simple_Storage_Pool => Storage_Pool : | |
e10dab7f JM |
5749 | begin |
5750 | Check_E0; | |
996ae0b0 | 5751 | |
e10dab7f | 5752 | if Is_Access_Type (P_Type) then |
468c6c8a | 5753 | if Ekind (P_Type) = E_Access_Subprogram_Type then |
822033eb HK |
5754 | Error_Attr_P |
5755 | ("cannot use % attribute for access-to-subprogram type"); | |
468c6c8a ES |
5756 | end if; |
5757 | ||
996ae0b0 RK |
5758 | -- Set appropriate entity |
5759 | ||
5760 | if Present (Associated_Storage_Pool (Root_Type (P_Type))) then | |
5761 | Set_Entity (N, Associated_Storage_Pool (Root_Type (P_Type))); | |
5762 | else | |
5763 | Set_Entity (N, RTE (RE_Global_Pool_Object)); | |
5764 | end if; | |
5765 | ||
a8551b5f AC |
5766 | if Attr_Id = Attribute_Storage_Pool then |
5767 | if Present (Get_Rep_Pragma (Etype (Entity (N)), | |
f6205414 | 5768 | Name_Simple_Storage_Pool_Type)) |
a8551b5f AC |
5769 | then |
5770 | Error_Msg_Name_1 := Aname; | |
43417b90 | 5771 | Error_Msg_Warn := SPARK_Mode /= On; |
324ac540 | 5772 | Error_Msg_N ("cannot use % attribute for type with simple " |
4a28b181 AC |
5773 | & "storage pool<<", N); |
5774 | Error_Msg_N ("\Program_Error [<<", N); | |
a8551b5f AC |
5775 | |
5776 | Rewrite | |
5777 | (N, Make_Raise_Program_Error | |
5778 | (Sloc (N), Reason => PE_Explicit_Raise)); | |
5779 | end if; | |
5780 | ||
5781 | Set_Etype (N, Class_Wide_Type (RTE (RE_Root_Storage_Pool))); | |
5782 | ||
5783 | -- In the Simple_Storage_Pool case, verify that the pool entity is | |
5784 | -- actually of a simple storage pool type, and set the attribute's | |
5785 | -- type to the pool object's type. | |
5786 | ||
5787 | else | |
5788 | if not Present (Get_Rep_Pragma (Etype (Entity (N)), | |
f6205414 | 5789 | Name_Simple_Storage_Pool_Type)) |
a8551b5f AC |
5790 | then |
5791 | Error_Attr_P | |
5792 | ("cannot use % attribute for type without simple " & | |
5793 | "storage pool"); | |
5794 | end if; | |
5795 | ||
5796 | Set_Etype (N, Etype (Entity (N))); | |
5797 | end if; | |
996ae0b0 RK |
5798 | |
5799 | -- Validate_Remote_Access_To_Class_Wide_Type for attribute | |
5800 | -- Storage_Pool since this attribute is not defined for such | |
5801 | -- types (RM E.2.3(22)). | |
5802 | ||
5803 | Validate_Remote_Access_To_Class_Wide_Type (N); | |
5804 | ||
5805 | else | |
822033eb | 5806 | Error_Attr_P ("prefix of % attribute must be access type"); |
996ae0b0 | 5807 | end if; |
e10dab7f | 5808 | end Storage_Pool; |
996ae0b0 RK |
5809 | |
5810 | ------------------ | |
5811 | -- Storage_Size -- | |
5812 | ------------------ | |
5813 | ||
e10dab7f JM |
5814 | when Attribute_Storage_Size => Storage_Size : |
5815 | begin | |
5816 | Check_E0; | |
5817 | ||
996ae0b0 | 5818 | if Is_Task_Type (P_Type) then |
996ae0b0 RK |
5819 | Set_Etype (N, Universal_Integer); |
5820 | ||
b5c739f9 RD |
5821 | -- Use with tasks is an obsolescent feature |
5822 | ||
5823 | Check_Restriction (No_Obsolescent_Features, P); | |
5824 | ||
996ae0b0 | 5825 | elsif Is_Access_Type (P_Type) then |
468c6c8a | 5826 | if Ekind (P_Type) = E_Access_Subprogram_Type then |
822033eb HK |
5827 | Error_Attr_P |
5828 | ("cannot use % attribute for access-to-subprogram type"); | |
468c6c8a ES |
5829 | end if; |
5830 | ||
996ae0b0 RK |
5831 | if Is_Entity_Name (P) |
5832 | and then Is_Type (Entity (P)) | |
5833 | then | |
996ae0b0 RK |
5834 | Check_Type; |
5835 | Set_Etype (N, Universal_Integer); | |
5836 | ||
5837 | -- Validate_Remote_Access_To_Class_Wide_Type for attribute | |
5838 | -- Storage_Size since this attribute is not defined for | |
5839 | -- such types (RM E.2.3(22)). | |
5840 | ||
5841 | Validate_Remote_Access_To_Class_Wide_Type (N); | |
5842 | ||
29ba9f52 RD |
5843 | -- The prefix is allowed to be an implicit dereference of an |
5844 | -- access value designating a task. | |
996ae0b0 RK |
5845 | |
5846 | else | |
996ae0b0 RK |
5847 | Check_Task_Prefix; |
5848 | Set_Etype (N, Universal_Integer); | |
5849 | end if; | |
5850 | ||
5851 | else | |
822033eb | 5852 | Error_Attr_P ("prefix of % attribute must be access or task type"); |
996ae0b0 | 5853 | end if; |
e10dab7f | 5854 | end Storage_Size; |
996ae0b0 RK |
5855 | |
5856 | ------------------ | |
5857 | -- Storage_Unit -- | |
5858 | ------------------ | |
5859 | ||
5860 | when Attribute_Storage_Unit => | |
5861 | Standard_Attribute (Ttypes.System_Storage_Unit); | |
5862 | ||
82c80734 RD |
5863 | ----------------- |
5864 | -- Stream_Size -- | |
5865 | ----------------- | |
5866 | ||
5867 | when Attribute_Stream_Size => | |
5868 | Check_E0; | |
5869 | Check_Type; | |
5870 | ||
5871 | if Is_Entity_Name (P) | |
5872 | and then Is_Elementary_Type (Entity (P)) | |
5873 | then | |
5874 | Set_Etype (N, Universal_Integer); | |
5875 | else | |
822033eb | 5876 | Error_Attr_P ("invalid prefix for % attribute"); |
82c80734 RD |
5877 | end if; |
5878 | ||
468c6c8a ES |
5879 | --------------- |
5880 | -- Stub_Type -- | |
5881 | --------------- | |
5882 | ||
5883 | when Attribute_Stub_Type => | |
5884 | Check_Type; | |
5885 | Check_E0; | |
5886 | ||
25081892 AC |
5887 | if Is_Remote_Access_To_Class_Wide_Type (Base_Type (P_Type)) then |
5888 | ||
22243c12 | 5889 | -- For a real RACW [sub]type, use corresponding stub type |
25081892 | 5890 | |
22243c12 | 5891 | if not Is_Generic_Type (P_Type) then |
25081892 AC |
5892 | Rewrite (N, |
5893 | New_Occurrence_Of | |
5894 | (Corresponding_Stub_Type (Base_Type (P_Type)), Loc)); | |
5895 | ||
22243c12 RD |
5896 | -- For a generic type (that has been marked as an RACW using the |
5897 | -- Remote_Access_Type aspect or pragma), use a generic RACW stub | |
5898 | -- type. Note that if the actual is not a remote access type, the | |
5899 | -- instantiation will fail. | |
25081892 | 5900 | |
22243c12 | 5901 | else |
25081892 AC |
5902 | -- Note: we go to the underlying type here because the view |
5903 | -- returned by RTE (RE_RACW_Stub_Type) might be incomplete. | |
5904 | ||
5905 | Rewrite (N, | |
5906 | New_Occurrence_Of | |
5907 | (Underlying_Type (RTE (RE_RACW_Stub_Type)), Loc)); | |
5908 | end if; | |
5909 | ||
468c6c8a | 5910 | else |
822033eb HK |
5911 | Error_Attr_P |
5912 | ("prefix of% attribute must be remote access to classwide"); | |
468c6c8a ES |
5913 | end if; |
5914 | ||
996ae0b0 RK |
5915 | ---------- |
5916 | -- Succ -- | |
5917 | ---------- | |
5918 | ||
5919 | when Attribute_Succ => | |
5920 | Check_Scalar_Type; | |
5921 | Check_E1; | |
7a489a2b AC |
5922 | |
5923 | if Is_Real_Type (P_Type) or else Is_Boolean_Type (P_Type) then | |
5924 | Error_Msg_Name_1 := Aname; | |
5925 | Error_Msg_Name_2 := Chars (P_Type); | |
ce5ba43a AC |
5926 | Check_SPARK_05_Restriction |
5927 | ("attribute% is not allowed for type%", P); | |
7a489a2b AC |
5928 | end if; |
5929 | ||
996ae0b0 RK |
5930 | Resolve (E1, P_Base_Type); |
5931 | Set_Etype (N, P_Base_Type); | |
5932 | ||
9ab5d86b RD |
5933 | -- Since Pred works on the base type, we normally do no check for the |
5934 | -- floating-point case, since the base type is unconstrained. But we | |
5935 | -- make an exception in Check_Float_Overflow mode. | |
996ae0b0 | 5936 | |
6cade1b0 | 5937 | if Is_Floating_Point_Type (P_Type) then |
d26d790d AC |
5938 | if not Range_Checks_Suppressed (P_Base_Type) then |
5939 | Set_Do_Range_Check (E1); | |
0083dd66 | 5940 | end if; |
996ae0b0 | 5941 | |
edd63e9b | 5942 | -- If not modular type, test for overflow check required |
996ae0b0 RK |
5943 | |
5944 | else | |
5945 | if not Is_Modular_Integer_Type (P_Type) | |
5946 | and then not Range_Checks_Suppressed (P_Base_Type) | |
5947 | then | |
5948 | Enable_Range_Check (E1); | |
5949 | end if; | |
5950 | end if; | |
5951 | ||
c5ecd6b7 AC |
5952 | -------------------------------- |
5953 | -- System_Allocator_Alignment -- | |
5954 | -------------------------------- | |
5955 | ||
5956 | when Attribute_System_Allocator_Alignment => | |
5957 | Standard_Attribute (Ttypes.System_Allocator_Alignment); | |
5958 | ||
996ae0b0 RK |
5959 | --------- |
5960 | -- Tag -- | |
5961 | --------- | |
5962 | ||
e10dab7f JM |
5963 | when Attribute_Tag => Tag : |
5964 | begin | |
996ae0b0 RK |
5965 | Check_E0; |
5966 | Check_Dereference; | |
5967 | ||
5968 | if not Is_Tagged_Type (P_Type) then | |
822033eb | 5969 | Error_Attr_P ("prefix of % attribute must be tagged"); |
996ae0b0 | 5970 | |
324ac540 AC |
5971 | -- Next test does not apply to generated code why not, and what does |
5972 | -- the illegal reference mean??? | |
996ae0b0 RK |
5973 | |
5974 | elsif Is_Object_Reference (P) | |
5975 | and then not Is_Class_Wide_Type (P_Type) | |
5976 | and then Comes_From_Source (N) | |
5977 | then | |
822033eb HK |
5978 | Error_Attr_P |
5979 | ("% attribute can only be applied to objects " & | |
5980 | "of class - wide type"); | |
996ae0b0 RK |
5981 | end if; |
5982 | ||
324ac540 AC |
5983 | -- The prefix cannot be an incomplete type. However, references to |
5984 | -- 'Tag can be generated when expanding interface conversions, and | |
5985 | -- this is legal. | |
822033eb HK |
5986 | |
5987 | if Comes_From_Source (N) then | |
5988 | Check_Not_Incomplete_Type; | |
5989 | end if; | |
7b76e805 RD |
5990 | |
5991 | -- Set appropriate type | |
5992 | ||
996ae0b0 | 5993 | Set_Etype (N, RTE (RE_Tag)); |
e10dab7f | 5994 | end Tag; |
996ae0b0 | 5995 | |
fbf5a39b AC |
5996 | ----------------- |
5997 | -- Target_Name -- | |
5998 | ----------------- | |
5999 | ||
6000 | when Attribute_Target_Name => Target_Name : declare | |
6001 | TN : constant String := Sdefault.Target_Name.all; | |
1d571f3b | 6002 | TL : Natural; |
fbf5a39b AC |
6003 | |
6004 | begin | |
6005 | Check_Standard_Prefix; | |
1d571f3b AC |
6006 | |
6007 | TL := TN'Last; | |
fbf5a39b AC |
6008 | |
6009 | if TN (TL) = '/' or else TN (TL) = '\' then | |
6010 | TL := TL - 1; | |
6011 | end if; | |
6012 | ||
fbf5a39b AC |
6013 | Rewrite (N, |
6014 | Make_String_Literal (Loc, | |
1d571f3b | 6015 | Strval => TN (TN'First .. TL))); |
fbf5a39b | 6016 | Analyze_And_Resolve (N, Standard_String); |
edab6088 | 6017 | Set_Is_Static_Expression (N, True); |
fbf5a39b AC |
6018 | end Target_Name; |
6019 | ||
996ae0b0 RK |
6020 | ---------------- |
6021 | -- Terminated -- | |
6022 | ---------------- | |
6023 | ||
6024 | when Attribute_Terminated => | |
6025 | Check_E0; | |
6026 | Set_Etype (N, Standard_Boolean); | |
6027 | Check_Task_Prefix; | |
6028 | ||
996ae0b0 RK |
6029 | ---------------- |
6030 | -- To_Address -- | |
6031 | ---------------- | |
6032 | ||
c1645ac8 AC |
6033 | when Attribute_To_Address => To_Address : declare |
6034 | Val : Uint; | |
6035 | ||
6036 | begin | |
996ae0b0 RK |
6037 | Check_E1; |
6038 | Analyze (P); | |
f7ea2603 | 6039 | Check_System_Prefix; |
996ae0b0 RK |
6040 | |
6041 | Generate_Reference (RTE (RE_Address), P); | |
6042 | Analyze_And_Resolve (E1, Any_Integer); | |
6043 | Set_Etype (N, RTE (RE_Address)); | |
6044 | ||
edab6088 RD |
6045 | if Is_Static_Expression (E1) then |
6046 | Set_Is_Static_Expression (N, True); | |
6047 | end if; | |
6048 | ||
6049 | -- OK static expression case, check range and set appropriate type | |
c1645ac8 AC |
6050 | |
6051 | if Is_OK_Static_Expression (E1) then | |
6052 | Val := Expr_Value (E1); | |
6053 | ||
6054 | if Val < -(2 ** UI_From_Int (Standard'Address_Size - 1)) | |
6055 | or else | |
6056 | Val > 2 ** UI_From_Int (Standard'Address_Size) - 1 | |
6057 | then | |
6058 | Error_Attr ("address value out of range for % attribute", E1); | |
6059 | end if; | |
6060 | ||
7569f697 AC |
6061 | -- In most cases the expression is a numeric literal or some other |
6062 | -- address expression, but if it is a declared constant it may be | |
6063 | -- of a compatible type that must be left on the node. | |
6064 | ||
6065 | if Is_Entity_Name (E1) then | |
6066 | null; | |
6067 | ||
c1645ac8 AC |
6068 | -- Set type to universal integer if negative |
6069 | ||
7569f697 | 6070 | elsif Val < 0 then |
c1645ac8 AC |
6071 | Set_Etype (E1, Universal_Integer); |
6072 | ||
6073 | -- Otherwise set type to Unsigned_64 to accomodate max values | |
6074 | ||
6075 | else | |
6076 | Set_Etype (E1, Standard_Unsigned_64); | |
6077 | end if; | |
6078 | end if; | |
edab6088 RD |
6079 | |
6080 | Set_Is_Static_Expression (N, True); | |
c1645ac8 AC |
6081 | end To_Address; |
6082 | ||
54838d1f AC |
6083 | ------------ |
6084 | -- To_Any -- | |
6085 | ------------ | |
6086 | ||
6087 | when Attribute_To_Any => | |
6088 | Check_E1; | |
6089 | Check_PolyORB_Attribute; | |
6090 | Set_Etype (N, RTE (RE_Any)); | |
6091 | ||
996ae0b0 RK |
6092 | ---------------- |
6093 | -- Truncation -- | |
6094 | ---------------- | |
6095 | ||
6096 | when Attribute_Truncation => | |
6097 | Check_Floating_Point_Type_1; | |
6098 | Resolve (E1, P_Base_Type); | |
6099 | Set_Etype (N, P_Base_Type); | |
6100 | ||
6101 | ---------------- | |
6102 | -- Type_Class -- | |
6103 | ---------------- | |
6104 | ||
6105 | when Attribute_Type_Class => | |
6106 | Check_E0; | |
6107 | Check_Type; | |
6108 | Check_Not_Incomplete_Type; | |
6109 | Set_Etype (N, RTE (RE_Type_Class)); | |
6110 | ||
09494c32 AC |
6111 | -------------- |
6112 | -- TypeCode -- | |
6113 | -------------- | |
54838d1f AC |
6114 | |
6115 | when Attribute_TypeCode => | |
6116 | Check_E0; | |
6117 | Check_PolyORB_Attribute; | |
6118 | Set_Etype (N, RTE (RE_TypeCode)); | |
6119 | ||
9c870c90 AC |
6120 | -------------- |
6121 | -- Type_Key -- | |
6122 | -------------- | |
6123 | ||
6124 | when Attribute_Type_Key => | |
6125 | Check_E0; | |
6126 | Check_Type; | |
ddc1515a AC |
6127 | |
6128 | -- This processing belongs in Eval_Attribute ??? | |
6129 | ||
9c870c90 | 6130 | declare |
1aa23421 | 6131 | function Type_Key return String_Id; |
ddc1515a AC |
6132 | -- A very preliminary implementation. For now, a signature |
6133 | -- consists of only the type name. This is clearly incomplete | |
6134 | -- (e.g., adding a new field to a record type should change the | |
6135 | -- type's Type_Key attribute). | |
9c870c90 AC |
6136 | |
6137 | -------------- | |
6138 | -- Type_Key -- | |
6139 | -------------- | |
6140 | ||
1aa23421 | 6141 | function Type_Key return String_Id is |
9c870c90 | 6142 | Full_Name : constant String_Id := |
1aa23421 | 6143 | Fully_Qualified_Name_String (Entity (P)); |
ddc1515a | 6144 | |
9c870c90 | 6145 | begin |
1aa23421 | 6146 | -- Copy all characters in Full_Name but the trailing NUL |
9c870c90 | 6147 | |
1aa23421 AC |
6148 | Start_String; |
6149 | for J in 1 .. String_Length (Full_Name) - 1 loop | |
b3143037 | 6150 | Store_String_Char (Get_String_Char (Full_Name, Pos (J))); |
1aa23421 | 6151 | end loop; |
ddc1515a | 6152 | |
1aa23421 AC |
6153 | Store_String_Chars ("'Type_Key"); |
6154 | return End_String; | |
9c870c90 AC |
6155 | end Type_Key; |
6156 | ||
6157 | begin | |
6158 | Rewrite (N, Make_String_Literal (Loc, Type_Key)); | |
6159 | end; | |
6160 | ||
6161 | Analyze_And_Resolve (N, Standard_String); | |
6162 | ||
996ae0b0 RK |
6163 | ----------------------- |
6164 | -- Unbiased_Rounding -- | |
6165 | ----------------------- | |
6166 | ||
6167 | when Attribute_Unbiased_Rounding => | |
6168 | Check_Floating_Point_Type_1; | |
6169 | Set_Etype (N, P_Base_Type); | |
6170 | Resolve (E1, P_Base_Type); | |
6171 | ||
6172 | ---------------------- | |
6173 | -- Unchecked_Access -- | |
6174 | ---------------------- | |
6175 | ||
6176 | when Attribute_Unchecked_Access => | |
6177 | if Comes_From_Source (N) then | |
6178 | Check_Restriction (No_Unchecked_Access, N); | |
6179 | end if; | |
6180 | ||
fbf5a39b | 6181 | Analyze_Access_Attribute; |
22efcab7 | 6182 | Check_Not_Incomplete_Type; |
fbf5a39b AC |
6183 | |
6184 | ------------------------- | |
6185 | -- Unconstrained_Array -- | |
6186 | ------------------------- | |
6187 | ||
6188 | when Attribute_Unconstrained_Array => | |
6189 | Check_E0; | |
6190 | Check_Type; | |
6191 | Check_Not_Incomplete_Type; | |
6192 | Set_Etype (N, Standard_Boolean); | |
edab6088 | 6193 | Set_Is_Static_Expression (N, True); |
996ae0b0 RK |
6194 | |
6195 | ------------------------------ | |
6196 | -- Universal_Literal_String -- | |
6197 | ------------------------------ | |
6198 | ||
6199 | -- This is a GNAT specific attribute whose prefix must be a named | |
6200 | -- number where the expression is either a single numeric literal, | |
6201 | -- or a numeric literal immediately preceded by a minus sign. The | |
6202 | -- result is equivalent to a string literal containing the text of | |
6203 | -- the literal as it appeared in the source program with a possible | |
6204 | -- leading minus sign. | |
6205 | ||
6206 | when Attribute_Universal_Literal_String => Universal_Literal_String : | |
6207 | begin | |
6208 | Check_E0; | |
6209 | ||
6210 | if not Is_Entity_Name (P) | |
6211 | or else Ekind (Entity (P)) not in Named_Kind | |
6212 | then | |
822033eb | 6213 | Error_Attr_P ("prefix for % attribute must be named number"); |
996ae0b0 RK |
6214 | |
6215 | else | |
6216 | declare | |
6217 | Expr : Node_Id; | |
6218 | Negative : Boolean; | |
6219 | S : Source_Ptr; | |
6220 | Src : Source_Buffer_Ptr; | |
6221 | ||
6222 | begin | |
6223 | Expr := Original_Node (Expression (Parent (Entity (P)))); | |
6224 | ||
6225 | if Nkind (Expr) = N_Op_Minus then | |
6226 | Negative := True; | |
6227 | Expr := Original_Node (Right_Opnd (Expr)); | |
6228 | else | |
6229 | Negative := False; | |
6230 | end if; | |
6231 | ||
e10dab7f | 6232 | if not Nkind_In (Expr, N_Integer_Literal, N_Real_Literal) then |
996ae0b0 RK |
6233 | Error_Attr |
6234 | ("named number for % attribute must be simple literal", N); | |
6235 | end if; | |
6236 | ||
6237 | -- Build string literal corresponding to source literal text | |
6238 | ||
6239 | Start_String; | |
6240 | ||
6241 | if Negative then | |
6242 | Store_String_Char (Get_Char_Code ('-')); | |
6243 | end if; | |
6244 | ||
6245 | S := Sloc (Expr); | |
6246 | Src := Source_Text (Get_Source_File_Index (S)); | |
6247 | ||
6248 | while Src (S) /= ';' and then Src (S) /= ' ' loop | |
6249 | Store_String_Char (Get_Char_Code (Src (S))); | |
6250 | S := S + 1; | |
6251 | end loop; | |
6252 | ||
6253 | -- Now we rewrite the attribute with the string literal | |
6254 | ||
6255 | Rewrite (N, | |
6256 | Make_String_Literal (Loc, End_String)); | |
6257 | Analyze (N); | |
edab6088 | 6258 | Set_Is_Static_Expression (N, True); |
996ae0b0 RK |
6259 | end; |
6260 | end if; | |
6261 | end Universal_Literal_String; | |
6262 | ||
6263 | ------------------------- | |
6264 | -- Unrestricted_Access -- | |
6265 | ------------------------- | |
6266 | ||
6267 | -- This is a GNAT specific attribute which is like Access except that | |
3cd4a210 AC |
6268 | -- all scope checks and checks for aliased views are omitted. It is |
6269 | -- documented as being equivalent to the use of the Address attribute | |
6270 | -- followed by an unchecked conversion to the target access type. | |
996ae0b0 RK |
6271 | |
6272 | when Attribute_Unrestricted_Access => | |
dc36a7e3 RD |
6273 | |
6274 | -- If from source, deal with relevant restrictions | |
6275 | ||
996ae0b0 RK |
6276 | if Comes_From_Source (N) then |
6277 | Check_Restriction (No_Unchecked_Access, N); | |
83de674b | 6278 | |
67c86178 | 6279 | if Nkind (P) in N_Has_Entity |
dc36a7e3 RD |
6280 | and then Present (Entity (P)) |
6281 | and then Is_Object (Entity (P)) | |
67c86178 | 6282 | then |
83de674b AC |
6283 | Check_Restriction (No_Implicit_Aliasing, N); |
6284 | end if; | |
996ae0b0 RK |
6285 | end if; |
6286 | ||
6287 | if Is_Entity_Name (P) then | |
6288 | Set_Address_Taken (Entity (P)); | |
6289 | end if; | |
6290 | ||
3cd4a210 AC |
6291 | -- It might seem reasonable to call Address_Checks here to apply the |
6292 | -- same set of semantic checks that we enforce for 'Address (after | |
6293 | -- all we document Unrestricted_Access as being equivalent to the | |
6294 | -- use of Address followed by an Unchecked_Conversion). However, if | |
6295 | -- we do enable these checks, we get multiple failures in both the | |
6296 | -- compiler run-time and in our regression test suite, so we leave | |
6297 | -- out these checks for now. To be investigated further some time??? | |
6298 | ||
6299 | -- Address_Checks; | |
6300 | ||
6301 | -- Now complete analysis using common access processing | |
6302 | ||
fbf5a39b | 6303 | Analyze_Access_Attribute; |
996ae0b0 | 6304 | |
18a2ad5d AC |
6305 | ------------ |
6306 | -- Update -- | |
6307 | ------------ | |
6308 | ||
6309 | when Attribute_Update => Update : declare | |
cc6f5d75 AC |
6310 | Common_Typ : Entity_Id; |
6311 | -- The common type of a multiple component update for a record | |
6312 | ||
18a2ad5d | 6313 | Comps : Elist_Id := No_Elist; |
cc6f5d75 AC |
6314 | -- A list used in the resolution of a record update. It contains the |
6315 | -- entities of all record components processed so far. | |
18a2ad5d | 6316 | |
cc6f5d75 AC |
6317 | procedure Analyze_Array_Component_Update (Assoc : Node_Id); |
6318 | -- Analyze and resolve array_component_association Assoc against the | |
6319 | -- index of array type P_Type. | |
18a2ad5d | 6320 | |
cc6f5d75 AC |
6321 | procedure Analyze_Record_Component_Update (Comp : Node_Id); |
6322 | -- Analyze and resolve record_component_association Comp against | |
6323 | -- record type P_Type. | |
18a2ad5d | 6324 | |
cc6f5d75 AC |
6325 | ------------------------------------ |
6326 | -- Analyze_Array_Component_Update -- | |
6327 | ------------------------------------ | |
18a2ad5d | 6328 | |
cc6f5d75 AC |
6329 | procedure Analyze_Array_Component_Update (Assoc : Node_Id) is |
6330 | Expr : Node_Id; | |
6331 | High : Node_Id; | |
6332 | Index : Node_Id; | |
6333 | Index_Typ : Entity_Id; | |
6334 | Low : Node_Id; | |
18a2ad5d | 6335 | |
cc6f5d75 AC |
6336 | begin |
6337 | -- The current association contains a sequence of indexes denoting | |
6338 | -- an element of a multidimensional array: | |
18a2ad5d | 6339 | |
cc6f5d75 | 6340 | -- (Index_1, ..., Index_N) |
18a2ad5d | 6341 | |
cc6f5d75 AC |
6342 | -- Examine each individual index and resolve it against the proper |
6343 | -- index type of the array. | |
6344 | ||
6345 | if Nkind (First (Choices (Assoc))) = N_Aggregate then | |
6346 | Expr := First (Choices (Assoc)); | |
6347 | while Present (Expr) loop | |
6348 | ||
6349 | -- The use of others is illegal (SPARK RM 4.4.1(12)) | |
6350 | ||
6351 | if Nkind (Expr) = N_Others_Choice then | |
6352 | Error_Attr | |
6353 | ("others choice not allowed in attribute %", Expr); | |
6354 | ||
6355 | -- Otherwise analyze and resolve all indexes | |
6356 | ||
6357 | else | |
6358 | Index := First (Expressions (Expr)); | |
6359 | Index_Typ := First_Index (P_Type); | |
6360 | while Present (Index) and then Present (Index_Typ) loop | |
6361 | Analyze_And_Resolve (Index, Etype (Index_Typ)); | |
6362 | Next (Index); | |
6363 | Next_Index (Index_Typ); | |
6364 | end loop; | |
6365 | ||
6366 | -- Detect a case where the association either lacks an | |
6367 | -- index or contains an extra index. | |
6368 | ||
6369 | if Present (Index) or else Present (Index_Typ) then | |
6370 | Error_Msg_N | |
6371 | ("dimension mismatch in index list", Assoc); | |
18a2ad5d | 6372 | end if; |
cc6f5d75 | 6373 | end if; |
18a2ad5d | 6374 | |
cc6f5d75 AC |
6375 | Next (Expr); |
6376 | end loop; | |
6377 | ||
6378 | -- The current association denotes either a single component or a | |
6379 | -- range of components of a one dimensional array: | |
6380 | ||
6381 | -- 1, 2 .. 5 | |
6382 | ||
6383 | -- Resolve the index or its high and low bounds (if range) against | |
6384 | -- the proper index type of the array. | |
6385 | ||
6386 | else | |
6387 | Index := First (Choices (Assoc)); | |
6388 | Index_Typ := First_Index (P_Type); | |
6389 | ||
6390 | if Present (Next_Index (Index_Typ)) then | |
6391 | Error_Msg_N ("too few subscripts in array reference", Assoc); | |
18a2ad5d AC |
6392 | end if; |
6393 | ||
cc6f5d75 | 6394 | while Present (Index) loop |
18a2ad5d | 6395 | |
cc6f5d75 | 6396 | -- The use of others is illegal (SPARK RM 4.4.1(12)) |
18a2ad5d | 6397 | |
cc6f5d75 AC |
6398 | if Nkind (Index) = N_Others_Choice then |
6399 | Error_Attr | |
6400 | ("others choice not allowed in attribute %", Index); | |
6401 | ||
6402 | -- The index denotes a range of elements | |
6403 | ||
6404 | elsif Nkind (Index) = N_Range then | |
6405 | Low := Low_Bound (Index); | |
6406 | High := High_Bound (Index); | |
6407 | ||
6408 | Analyze_And_Resolve (Low, Etype (Index_Typ)); | |
6409 | Analyze_And_Resolve (High, Etype (Index_Typ)); | |
6410 | ||
6411 | -- Add a range check to ensure that the bounds of the | |
6412 | -- range are within the index type when this cannot be | |
6413 | -- determined statically. | |
6414 | ||
6415 | if not Is_OK_Static_Expression (Low) then | |
6416 | Set_Do_Range_Check (Low); | |
6417 | end if; | |
6418 | ||
6419 | if not Is_OK_Static_Expression (High) then | |
6420 | Set_Do_Range_Check (High); | |
6421 | end if; | |
6422 | ||
6423 | -- Otherwise the index denotes a single element | |
6424 | ||
6425 | else | |
6426 | Analyze_And_Resolve (Index, Etype (Index_Typ)); | |
6427 | ||
6428 | -- Add a range check to ensure that the index is within | |
6429 | -- the index type when it is not possible to determine | |
6430 | -- this statically. | |
6431 | ||
6432 | if not Is_OK_Static_Expression (Index) then | |
6433 | Set_Do_Range_Check (Index); | |
6434 | end if; | |
6435 | end if; | |
6436 | ||
6437 | Next (Index); | |
6438 | end loop; | |
6439 | end if; | |
6440 | end Analyze_Array_Component_Update; | |
6441 | ||
6442 | ------------------------------------- | |
6443 | -- Analyze_Record_Component_Update -- | |
6444 | ------------------------------------- | |
18a2ad5d | 6445 | |
cc6f5d75 AC |
6446 | procedure Analyze_Record_Component_Update (Comp : Node_Id) is |
6447 | Comp_Name : constant Name_Id := Chars (Comp); | |
6448 | Base_Typ : Entity_Id; | |
6449 | Comp_Or_Discr : Entity_Id; | |
18a2ad5d AC |
6450 | |
6451 | begin | |
6452 | -- Find the discriminant or component whose name corresponds to | |
6453 | -- Comp. A simple character comparison is sufficient because all | |
6454 | -- visible names within a record type are unique. | |
6455 | ||
cc6f5d75 | 6456 | Comp_Or_Discr := First_Entity (P_Type); |
18a2ad5d AC |
6457 | while Present (Comp_Or_Discr) loop |
6458 | if Chars (Comp_Or_Discr) = Comp_Name then | |
08cd7c2f | 6459 | |
cc6f5d75 AC |
6460 | -- Decorate the component reference by setting its entity |
6461 | -- and type for resolution purposes. | |
08cd7c2f AC |
6462 | |
6463 | Set_Entity (Comp, Comp_Or_Discr); | |
d950f051 | 6464 | Set_Etype (Comp, Etype (Comp_Or_Discr)); |
18a2ad5d AC |
6465 | exit; |
6466 | end if; | |
6467 | ||
6468 | Comp_Or_Discr := Next_Entity (Comp_Or_Discr); | |
6469 | end loop; | |
6470 | ||
cc6f5d75 | 6471 | -- Diagnose an illegal reference |
18a2ad5d AC |
6472 | |
6473 | if Present (Comp_Or_Discr) then | |
6474 | if Ekind (Comp_Or_Discr) = E_Discriminant then | |
6475 | Error_Attr | |
6476 | ("attribute % may not modify record discriminants", Comp); | |
6477 | ||
6478 | else pragma Assert (Ekind (Comp_Or_Discr) = E_Component); | |
cc6f5d75 AC |
6479 | if Contains (Comps, Comp_Or_Discr) then |
6480 | Error_Msg_N ("component & already updated", Comp); | |
18a2ad5d AC |
6481 | |
6482 | -- Mark this component as processed | |
6483 | ||
6484 | else | |
21c51f53 | 6485 | Append_New_Elmt (Comp_Or_Discr, Comps); |
18a2ad5d AC |
6486 | end if; |
6487 | end if; | |
6488 | ||
6489 | -- The update aggregate mentions an entity that does not belong to | |
6490 | -- the record type. | |
6491 | ||
6492 | else | |
cc6f5d75 AC |
6493 | Error_Msg_N ("& is not a component of aggregate subtype", Comp); |
6494 | end if; | |
6495 | ||
6496 | -- Verify the consistency of types when the current component is | |
6497 | -- part of a miltiple component update. | |
6498 | ||
6499 | -- Comp_1, ..., Comp_N => <value> | |
6500 | ||
6501 | if Present (Etype (Comp)) then | |
6502 | Base_Typ := Base_Type (Etype (Comp)); | |
6503 | ||
6504 | -- Save the type of the first component reference as the | |
6505 | -- remaning references (if any) must resolve to this type. | |
6506 | ||
6507 | if No (Common_Typ) then | |
6508 | Common_Typ := Base_Typ; | |
6509 | ||
6510 | elsif Base_Typ /= Common_Typ then | |
6511 | Error_Msg_N | |
6512 | ("components in choice list must have same type", Comp); | |
6513 | end if; | |
18a2ad5d | 6514 | end if; |
cc6f5d75 | 6515 | end Analyze_Record_Component_Update; |
18a2ad5d AC |
6516 | |
6517 | -- Local variables | |
6518 | ||
cc6f5d75 AC |
6519 | Assoc : Node_Id; |
6520 | Comp : Node_Id; | |
18a2ad5d AC |
6521 | |
6522 | -- Start of processing for Update | |
6523 | ||
6524 | begin | |
18a2ad5d AC |
6525 | Check_E1; |
6526 | ||
6527 | if not Is_Object_Reference (P) then | |
6528 | Error_Attr_P ("prefix of attribute % must denote an object"); | |
6529 | ||
6530 | elsif not Is_Array_Type (P_Type) | |
6531 | and then not Is_Record_Type (P_Type) | |
6532 | then | |
6533 | Error_Attr_P ("prefix of attribute % must be a record or array"); | |
6534 | ||
51245e2d | 6535 | elsif Is_Limited_View (P_Type) then |
18a2ad5d AC |
6536 | Error_Attr ("prefix of attribute % cannot be limited", N); |
6537 | ||
6538 | elsif Nkind (E1) /= N_Aggregate then | |
6539 | Error_Attr ("attribute % requires component association list", N); | |
6540 | end if; | |
6541 | ||
6542 | -- Inspect the update aggregate, looking at all the associations and | |
6543 | -- choices. Perform the following checks: | |
6544 | ||
6545 | -- 1) Legality of "others" in all cases | |
cc6f5d75 AC |
6546 | -- 2) Legality of <> |
6547 | -- 3) Component legality for arrays | |
6548 | -- 4) Component legality for records | |
18a2ad5d AC |
6549 | |
6550 | -- The remaining checks are performed on the expanded attribute | |
6551 | ||
6552 | Assoc := First (Component_Associations (E1)); | |
6553 | while Present (Assoc) loop | |
162c21d9 | 6554 | |
cc6f5d75 | 6555 | -- The use of <> is illegal (SPARK RM 4.4.1(1)) |
162c21d9 | 6556 | |
cc6f5d75 AC |
6557 | if Box_Present (Assoc) then |
6558 | Error_Attr | |
6559 | ("default initialization not allowed in attribute %", Assoc); | |
a6abfd78 | 6560 | |
cc6f5d75 | 6561 | -- Otherwise process the association |
d0ef7921 | 6562 | |
cc6f5d75 AC |
6563 | else |
6564 | Analyze (Expression (Assoc)); | |
6907542d | 6565 | |
cc6f5d75 AC |
6566 | if Is_Array_Type (P_Type) then |
6567 | Analyze_Array_Component_Update (Assoc); | |
cf28c974 | 6568 | |
cc6f5d75 | 6569 | elsif Is_Record_Type (P_Type) then |
6907542d | 6570 | |
cc6f5d75 AC |
6571 | -- Reset the common type used in a multiple component update |
6572 | -- as we are processing the contents of a new association. | |
cf28c974 | 6573 | |
cc6f5d75 | 6574 | Common_Typ := Empty; |
162c21d9 | 6575 | |
cc6f5d75 AC |
6576 | Comp := First (Choices (Assoc)); |
6577 | while Present (Comp) loop | |
6578 | if Nkind (Comp) = N_Identifier then | |
6579 | Analyze_Record_Component_Update (Comp); | |
50ea6357 | 6580 | |
cc6f5d75 | 6581 | -- The use of others is illegal (SPARK RM 4.4.1(5)) |
d0ef7921 | 6582 | |
cc6f5d75 AC |
6583 | elsif Nkind (Comp) = N_Others_Choice then |
6584 | Error_Attr | |
6585 | ("others choice not allowed in attribute %", Comp); | |
162c21d9 | 6586 | |
cc6f5d75 AC |
6587 | -- The name of a record component cannot appear in any |
6588 | -- other form. | |
162c21d9 | 6589 | |
d0ef7921 | 6590 | else |
46de64ca | 6591 | Error_Msg_N |
cc6f5d75 | 6592 | ("name should be identifier or OTHERS", Comp); |
46de64ca | 6593 | end if; |
18a2ad5d | 6594 | |
cc6f5d75 AC |
6595 | Next (Comp); |
6596 | end loop; | |
6597 | end if; | |
6598 | end if; | |
18a2ad5d AC |
6599 | |
6600 | Next (Assoc); | |
6601 | end loop; | |
6602 | ||
cc6f5d75 | 6603 | -- The type of attribute 'Update is that of the prefix |
18a2ad5d AC |
6604 | |
6605 | Set_Etype (N, P_Type); | |
71140fc6 YM |
6606 | |
6607 | Sem_Warn.Warn_On_Suspicious_Update (N); | |
18a2ad5d AC |
6608 | end Update; |
6609 | ||
996ae0b0 RK |
6610 | --------- |
6611 | -- Val -- | |
6612 | --------- | |
6613 | ||
6614 | when Attribute_Val => Val : declare | |
6615 | begin | |
6616 | Check_E1; | |
6617 | Check_Discrete_Type; | |
7a489a2b AC |
6618 | |
6619 | if Is_Boolean_Type (P_Type) then | |
6620 | Error_Msg_Name_1 := Aname; | |
6621 | Error_Msg_Name_2 := Chars (P_Type); | |
ce5ba43a | 6622 | Check_SPARK_05_Restriction |
7a489a2b AC |
6623 | ("attribute% is not allowed for type%", P); |
6624 | end if; | |
6625 | ||
996ae0b0 RK |
6626 | Resolve (E1, Any_Integer); |
6627 | Set_Etype (N, P_Base_Type); | |
6628 | ||
6629 | -- Note, we need a range check in general, but we wait for the | |
6630 | -- Resolve call to do this, since we want to let Eval_Attribute | |
a90bd866 | 6631 | -- have a chance to find an static illegality first. |
996ae0b0 RK |
6632 | end Val; |
6633 | ||
6634 | ----------- | |
6635 | -- Valid -- | |
6636 | ----------- | |
6637 | ||
6638 | when Attribute_Valid => | |
6639 | Check_E0; | |
6640 | ||
6641 | -- Ignore check for object if we have a 'Valid reference generated | |
6642 | -- by the expanded code, since in some cases valid checks can occur | |
6643 | -- on items that are names, but are not objects (e.g. attributes). | |
6644 | ||
6645 | if Comes_From_Source (N) then | |
6646 | Check_Object_Reference (P); | |
6647 | end if; | |
6648 | ||
6649 | if not Is_Scalar_Type (P_Type) then | |
822033eb | 6650 | Error_Attr_P ("object for % attribute must be of scalar type"); |
996ae0b0 RK |
6651 | end if; |
6652 | ||
97948f41 AC |
6653 | -- If the attribute appears within the subtype's own predicate |
6654 | -- function, then issue a warning that this will cause infinite | |
6655 | -- recursion. | |
6656 | ||
6657 | declare | |
6658 | Pred_Func : constant Entity_Id := Predicate_Function (P_Type); | |
6659 | ||
6660 | begin | |
6661 | if Present (Pred_Func) and then Current_Scope = Pred_Func then | |
6662 | Error_Msg_N | |
324ac540 AC |
6663 | ("attribute Valid requires a predicate check??", N); |
6664 | Error_Msg_N ("\and will result in infinite recursion??", N); | |
97948f41 AC |
6665 | end if; |
6666 | end; | |
6667 | ||
996ae0b0 RK |
6668 | Set_Etype (N, Standard_Boolean); |
6669 | ||
2a1f6a1f AC |
6670 | ------------------- |
6671 | -- Valid_Scalars -- | |
6672 | ------------------- | |
6673 | ||
6674 | when Attribute_Valid_Scalars => | |
6675 | Check_E0; | |
99fc068e | 6676 | Check_Object_Reference (P); |
45ec05e1 | 6677 | Set_Etype (N, Standard_Boolean); |
99fc068e | 6678 | |
45ec05e1 | 6679 | -- Following checks are only for source types |
99fc068e | 6680 | |
45ec05e1 RD |
6681 | if Comes_From_Source (N) then |
6682 | if not Scalar_Part_Present (P_Type) then | |
6683 | Error_Attr_P | |
6684 | ("??attribute % always True, no scalars to check"); | |
6685 | end if; | |
6686 | ||
6687 | -- Not allowed for unchecked union type | |
6688 | ||
6689 | if Has_Unchecked_Union (P_Type) then | |
6690 | Error_Attr_P | |
6691 | ("attribute % not allowed for Unchecked_Union type"); | |
6692 | end if; | |
6693 | end if; | |
2a1f6a1f | 6694 | |
996ae0b0 RK |
6695 | ----------- |
6696 | -- Value -- | |
6697 | ----------- | |
6698 | ||
6699 | when Attribute_Value => Value : | |
6700 | begin | |
ce5ba43a | 6701 | Check_SPARK_05_Restriction_On_Attribute; |
996ae0b0 RK |
6702 | Check_E1; |
6703 | Check_Scalar_Type; | |
6704 | ||
442ade9d RD |
6705 | -- Case of enumeration type |
6706 | ||
3e7302c3 AC |
6707 | -- When an enumeration type appears in an attribute reference, all |
6708 | -- literals of the type are marked as referenced. This must only be | |
6709 | -- done if the attribute reference appears in the current source. | |
6710 | -- Otherwise the information on references may differ between a | |
6711 | -- normal compilation and one that performs inlining. | |
6712 | ||
8097203f AC |
6713 | if Is_Enumeration_Type (P_Type) |
6714 | and then In_Extended_Main_Code_Unit (N) | |
6715 | then | |
996ae0b0 | 6716 | Check_Restriction (No_Enumeration_Maps, N); |
442ade9d RD |
6717 | |
6718 | -- Mark all enumeration literals as referenced, since the use of | |
6719 | -- the Value attribute can implicitly reference any of the | |
6720 | -- literals of the enumeration base type. | |
6721 | ||
6722 | declare | |
6723 | Ent : Entity_Id := First_Literal (P_Base_Type); | |
6724 | begin | |
6725 | while Present (Ent) loop | |
6726 | Set_Referenced (Ent); | |
6727 | Next_Literal (Ent); | |
6728 | end loop; | |
6729 | end; | |
996ae0b0 RK |
6730 | end if; |
6731 | ||
fbf5a39b AC |
6732 | -- Set Etype before resolving expression because expansion of |
6733 | -- expression may require enclosing type. Note that the type | |
6734 | -- returned by 'Value is the base type of the prefix type. | |
996ae0b0 | 6735 | |
fbf5a39b | 6736 | Set_Etype (N, P_Base_Type); |
996ae0b0 | 6737 | Validate_Non_Static_Attribute_Function_Call; |
0688dac8 RD |
6738 | |
6739 | -- Check restriction No_Fixed_IO | |
6740 | ||
6741 | if Restriction_Check_Required (No_Fixed_IO) | |
6742 | and then Is_Fixed_Point_Type (P_Type) | |
6743 | then | |
6744 | Check_Restriction (No_Fixed_IO, P); | |
6745 | end if; | |
996ae0b0 RK |
6746 | end Value; |
6747 | ||
6748 | ---------------- | |
6749 | -- Value_Size -- | |
6750 | ---------------- | |
6751 | ||
6752 | when Attribute_Value_Size => | |
6753 | Check_E0; | |
6754 | Check_Type; | |
6755 | Check_Not_Incomplete_Type; | |
6756 | Set_Etype (N, Universal_Integer); | |
6757 | ||
6758 | ------------- | |
6759 | -- Version -- | |
6760 | ------------- | |
6761 | ||
6762 | when Attribute_Version => | |
6763 | Check_E0; | |
6764 | Check_Program_Unit; | |
6765 | Set_Etype (N, RTE (RE_Version_String)); | |
6766 | ||
6767 | ------------------ | |
6768 | -- Wchar_T_Size -- | |
6769 | ------------------ | |
6770 | ||
6771 | when Attribute_Wchar_T_Size => | |
6772 | Standard_Attribute (Interfaces_Wchar_T_Size); | |
6773 | ||
6774 | ---------------- | |
6775 | -- Wide_Image -- | |
6776 | ---------------- | |
6777 | ||
6778 | when Attribute_Wide_Image => Wide_Image : | |
6779 | begin | |
ce5ba43a | 6780 | Check_SPARK_05_Restriction_On_Attribute; |
996ae0b0 RK |
6781 | Check_Scalar_Type; |
6782 | Set_Etype (N, Standard_Wide_String); | |
6783 | Check_E1; | |
6784 | Resolve (E1, P_Base_Type); | |
6785 | Validate_Non_Static_Attribute_Function_Call; | |
0688dac8 RD |
6786 | |
6787 | -- Check restriction No_Fixed_IO | |
6788 | ||
6789 | if Restriction_Check_Required (No_Fixed_IO) | |
6790 | and then Is_Fixed_Point_Type (P_Type) | |
6791 | then | |
6792 | Check_Restriction (No_Fixed_IO, P); | |
6793 | end if; | |
996ae0b0 RK |
6794 | end Wide_Image; |
6795 | ||
82c80734 RD |
6796 | --------------------- |
6797 | -- Wide_Wide_Image -- | |
6798 | --------------------- | |
6799 | ||
6800 | when Attribute_Wide_Wide_Image => Wide_Wide_Image : | |
6801 | begin | |
6802 | Check_Scalar_Type; | |
6803 | Set_Etype (N, Standard_Wide_Wide_String); | |
6804 | Check_E1; | |
6805 | Resolve (E1, P_Base_Type); | |
6806 | Validate_Non_Static_Attribute_Function_Call; | |
0688dac8 RD |
6807 | |
6808 | -- Check restriction No_Fixed_IO | |
6809 | ||
6810 | if Restriction_Check_Required (No_Fixed_IO) | |
6811 | and then Is_Fixed_Point_Type (P_Type) | |
6812 | then | |
6813 | Check_Restriction (No_Fixed_IO, P); | |
6814 | end if; | |
82c80734 RD |
6815 | end Wide_Wide_Image; |
6816 | ||
996ae0b0 RK |
6817 | ---------------- |
6818 | -- Wide_Value -- | |
6819 | ---------------- | |
6820 | ||
6821 | when Attribute_Wide_Value => Wide_Value : | |
6822 | begin | |
ce5ba43a | 6823 | Check_SPARK_05_Restriction_On_Attribute; |
996ae0b0 RK |
6824 | Check_E1; |
6825 | Check_Scalar_Type; | |
6826 | ||
6827 | -- Set Etype before resolving expression because expansion | |
6828 | -- of expression may require enclosing type. | |
6829 | ||
6830 | Set_Etype (N, P_Type); | |
6831 | Validate_Non_Static_Attribute_Function_Call; | |
0688dac8 RD |
6832 | |
6833 | -- Check restriction No_Fixed_IO | |
6834 | ||
6835 | if Restriction_Check_Required (No_Fixed_IO) | |
6836 | and then Is_Fixed_Point_Type (P_Type) | |
6837 | then | |
6838 | Check_Restriction (No_Fixed_IO, P); | |
6839 | end if; | |
996ae0b0 RK |
6840 | end Wide_Value; |
6841 | ||
82c80734 RD |
6842 | --------------------- |
6843 | -- Wide_Wide_Value -- | |
6844 | --------------------- | |
6845 | ||
6846 | when Attribute_Wide_Wide_Value => Wide_Wide_Value : | |
6847 | begin | |
6848 | Check_E1; | |
6849 | Check_Scalar_Type; | |
6850 | ||
6851 | -- Set Etype before resolving expression because expansion | |
6852 | -- of expression may require enclosing type. | |
6853 | ||
6854 | Set_Etype (N, P_Type); | |
6855 | Validate_Non_Static_Attribute_Function_Call; | |
0688dac8 RD |
6856 | |
6857 | -- Check restriction No_Fixed_IO | |
6858 | ||
6859 | if Restriction_Check_Required (No_Fixed_IO) | |
6860 | and then Is_Fixed_Point_Type (P_Type) | |
6861 | then | |
6862 | Check_Restriction (No_Fixed_IO, P); | |
6863 | end if; | |
82c80734 RD |
6864 | end Wide_Wide_Value; |
6865 | ||
6866 | --------------------- | |
6867 | -- Wide_Wide_Width -- | |
6868 | --------------------- | |
6869 | ||
6870 | when Attribute_Wide_Wide_Width => | |
6871 | Check_E0; | |
6872 | Check_Scalar_Type; | |
6873 | Set_Etype (N, Universal_Integer); | |
6874 | ||
996ae0b0 RK |
6875 | ---------------- |
6876 | -- Wide_Width -- | |
6877 | ---------------- | |
6878 | ||
6879 | when Attribute_Wide_Width => | |
ce5ba43a | 6880 | Check_SPARK_05_Restriction_On_Attribute; |
996ae0b0 RK |
6881 | Check_E0; |
6882 | Check_Scalar_Type; | |
6883 | Set_Etype (N, Universal_Integer); | |
6884 | ||
6885 | ----------- | |
6886 | -- Width -- | |
6887 | ----------- | |
6888 | ||
6889 | when Attribute_Width => | |
ce5ba43a | 6890 | Check_SPARK_05_Restriction_On_Attribute; |
996ae0b0 RK |
6891 | Check_E0; |
6892 | Check_Scalar_Type; | |
6893 | Set_Etype (N, Universal_Integer); | |
6894 | ||
6895 | --------------- | |
6896 | -- Word_Size -- | |
6897 | --------------- | |
6898 | ||
6899 | when Attribute_Word_Size => | |
6900 | Standard_Attribute (System_Word_Size); | |
6901 | ||
6902 | ----------- | |
6903 | -- Write -- | |
6904 | ----------- | |
6905 | ||
6906 | when Attribute_Write => | |
6907 | Check_E2; | |
fbf5a39b | 6908 | Check_Stream_Attribute (TSS_Stream_Write); |
996ae0b0 | 6909 | Set_Etype (N, Standard_Void_Type); |
996ae0b0 RK |
6910 | Resolve (N, Standard_Void_Type); |
6911 | ||
6912 | end case; | |
6913 | ||
6914 | -- All errors raise Bad_Attribute, so that we get out before any further | |
6915 | -- damage occurs when an error is detected (for example, if we check for | |
6916 | -- one attribute expression, and the check succeeds, we want to be able | |
6917 | -- to proceed securely assuming that an expression is in fact present. | |
6918 | ||
0da2c8ac AC |
6919 | -- Note: we set the attribute analyzed in this case to prevent any |
6920 | -- attempt at reanalysis which could generate spurious error msgs. | |
6921 | ||
996ae0b0 RK |
6922 | exception |
6923 | when Bad_Attribute => | |
0da2c8ac | 6924 | Set_Analyzed (N); |
996ae0b0 RK |
6925 | Set_Etype (N, Any_Type); |
6926 | return; | |
996ae0b0 RK |
6927 | end Analyze_Attribute; |
6928 | ||
6929 | -------------------- | |
6930 | -- Eval_Attribute -- | |
6931 | -------------------- | |
6932 | ||
6933 | procedure Eval_Attribute (N : Node_Id) is | |
6934 | Loc : constant Source_Ptr := Sloc (N); | |
6935 | Aname : constant Name_Id := Attribute_Name (N); | |
6936 | Id : constant Attribute_Id := Get_Attribute_Id (Aname); | |
6937 | P : constant Node_Id := Prefix (N); | |
6938 | ||
6939 | C_Type : constant Entity_Id := Etype (N); | |
edd63e9b | 6940 | -- The type imposed by the context |
996ae0b0 RK |
6941 | |
6942 | E1 : Node_Id; | |
6943 | -- First expression, or Empty if none | |
6944 | ||
6945 | E2 : Node_Id; | |
6946 | -- Second expression, or Empty if none | |
6947 | ||
6948 | P_Entity : Entity_Id; | |
6949 | -- Entity denoted by prefix | |
6950 | ||
6951 | P_Type : Entity_Id; | |
6952 | -- The type of the prefix | |
6953 | ||
6954 | P_Base_Type : Entity_Id; | |
6955 | -- The base type of the prefix type | |
6956 | ||
6957 | P_Root_Type : Entity_Id; | |
6958 | -- The root type of the prefix type | |
6959 | ||
6960 | Static : Boolean; | |
fbf5a39b AC |
6961 | -- True if the result is Static. This is set by the general processing |
6962 | -- to true if the prefix is static, and all expressions are static. It | |
edab6088 RD |
6963 | -- can be reset as processing continues for particular attributes. This |
6964 | -- flag can still be True if the reference raises a constraint error. | |
6965 | -- Is_Static_Expression (N) is set to follow this value as it is set | |
6966 | -- and we could always reference this, but it is convenient to have a | |
6967 | -- simple short name to use, since it is frequently referenced. | |
996ae0b0 RK |
6968 | |
6969 | Lo_Bound, Hi_Bound : Node_Id; | |
6970 | -- Expressions for low and high bounds of type or array index referenced | |
6971 | -- by First, Last, or Length attribute for array, set by Set_Bounds. | |
6972 | ||
6973 | CE_Node : Node_Id; | |
6974 | -- Constraint error node used if we have an attribute reference has | |
6975 | -- an argument that raises a constraint error. In this case we replace | |
6976 | -- the attribute with a raise constraint_error node. This is important | |
6977 | -- processing, since otherwise gigi might see an attribute which it is | |
6978 | -- unprepared to deal with. | |
6979 | ||
5a153b27 AC |
6980 | procedure Check_Concurrent_Discriminant (Bound : Node_Id); |
6981 | -- If Bound is a reference to a discriminant of a task or protected type | |
6982 | -- occurring within the object's body, rewrite attribute reference into | |
6983 | -- a reference to the corresponding discriminal. Use for the expansion | |
6984 | -- of checks against bounds of entry family index subtypes. | |
6985 | ||
996ae0b0 RK |
6986 | procedure Check_Expressions; |
6987 | -- In case where the attribute is not foldable, the expressions, if | |
6988 | -- any, of the attribute, are in a non-static context. This procedure | |
6989 | -- performs the required additional checks. | |
6990 | ||
fbf5a39b AC |
6991 | function Compile_Time_Known_Bounds (Typ : Entity_Id) return Boolean; |
6992 | -- Determines if the given type has compile time known bounds. Note | |
6993 | -- that we enter the case statement even in cases where the prefix | |
6994 | -- type does NOT have known bounds, so it is important to guard any | |
6995 | -- attempt to evaluate both bounds with a call to this function. | |
6996 | ||
32213142 RD |
6997 | procedure Compile_Time_Known_Attribute (N : Node_Id; Val : Uint); |
6998 | -- This procedure is called when the attribute N has a non-static | |
6999 | -- but compile time known value given by Val. It includes the | |
7000 | -- necessary checks for out of range values. | |
7001 | ||
996ae0b0 RK |
7002 | function Fore_Value return Nat; |
7003 | -- Computes the Fore value for the current attribute prefix, which is | |
7004 | -- known to be a static fixed-point type. Used by Fore and Width. | |
7005 | ||
7006 | function Mantissa return Uint; | |
7007 | -- Returns the Mantissa value for the prefix type | |
7008 | ||
7009 | procedure Set_Bounds; | |
7010 | -- Used for First, Last and Length attributes applied to an array or | |
fbf5a39b | 7011 | -- array subtype. Sets the variables Lo_Bound and Hi_Bound to the low |
996ae0b0 | 7012 | -- and high bound expressions for the index referenced by the attribute |
011f9d5d AC |
7013 | -- designator (i.e. the first index if no expression is present, and the |
7014 | -- N'th index if the value N is present as an expression). Also used for | |
7015 | -- First and Last of scalar types and for First_Valid and Last_Valid. | |
7016 | -- Static is reset to False if the type or index type is not statically | |
7017 | -- constrained. | |
996ae0b0 | 7018 | |
c4e5e10f TQ |
7019 | function Statically_Denotes_Entity (N : Node_Id) return Boolean; |
7020 | -- Verify that the prefix of a potentially static array attribute | |
7021 | -- satisfies the conditions of 4.9 (14). | |
7022 | ||
5a153b27 AC |
7023 | ----------------------------------- |
7024 | -- Check_Concurrent_Discriminant -- | |
7025 | ----------------------------------- | |
7026 | ||
7027 | procedure Check_Concurrent_Discriminant (Bound : Node_Id) is | |
6ca9ec9c | 7028 | Tsk : Entity_Id; |
5a153b27 | 7029 | -- The concurrent (task or protected) type |
6ca9ec9c | 7030 | |
5a153b27 AC |
7031 | begin |
7032 | if Nkind (Bound) = N_Identifier | |
7033 | and then Ekind (Entity (Bound)) = E_Discriminant | |
7034 | and then Is_Concurrent_Record_Type (Scope (Entity (Bound))) | |
7035 | then | |
7036 | Tsk := Corresponding_Concurrent_Type (Scope (Entity (Bound))); | |
6ca9ec9c AC |
7037 | |
7038 | if In_Open_Scopes (Tsk) and then Has_Completion (Tsk) then | |
7039 | ||
5a153b27 AC |
7040 | -- Find discriminant of original concurrent type, and use |
7041 | -- its current discriminal, which is the renaming within | |
7042 | -- the task/protected body. | |
7043 | ||
7044 | Rewrite (N, | |
7045 | New_Occurrence_Of | |
7046 | (Find_Body_Discriminal (Entity (Bound)), Loc)); | |
7047 | end if; | |
7048 | end if; | |
7049 | end Check_Concurrent_Discriminant; | |
7050 | ||
996ae0b0 RK |
7051 | ----------------------- |
7052 | -- Check_Expressions -- | |
7053 | ----------------------- | |
7054 | ||
7055 | procedure Check_Expressions is | |
442ade9d | 7056 | E : Node_Id; |
996ae0b0 | 7057 | begin |
442ade9d | 7058 | E := E1; |
996ae0b0 RK |
7059 | while Present (E) loop |
7060 | Check_Non_Static_Context (E); | |
7061 | Next (E); | |
7062 | end loop; | |
7063 | end Check_Expressions; | |
7064 | ||
32213142 RD |
7065 | ---------------------------------- |
7066 | -- Compile_Time_Known_Attribute -- | |
7067 | ---------------------------------- | |
7068 | ||
7069 | procedure Compile_Time_Known_Attribute (N : Node_Id; Val : Uint) is | |
7070 | T : constant Entity_Id := Etype (N); | |
7071 | ||
7072 | begin | |
fbf5a39b | 7073 | Fold_Uint (N, Val, False); |
32213142 RD |
7074 | |
7075 | -- Check that result is in bounds of the type if it is static | |
7076 | ||
c800f862 | 7077 | if Is_In_Range (N, T, Assume_Valid => False) then |
32213142 RD |
7078 | null; |
7079 | ||
7080 | elsif Is_Out_Of_Range (N, T) then | |
7081 | Apply_Compile_Time_Constraint_Error | |
324ac540 | 7082 | (N, "value not in range of}??", CE_Range_Check_Failed); |
32213142 RD |
7083 | |
7084 | elsif not Range_Checks_Suppressed (T) then | |
7085 | Enable_Range_Check (N); | |
7086 | ||
7087 | else | |
7088 | Set_Do_Range_Check (N, False); | |
7089 | end if; | |
7090 | end Compile_Time_Known_Attribute; | |
7091 | ||
fbf5a39b AC |
7092 | ------------------------------- |
7093 | -- Compile_Time_Known_Bounds -- | |
7094 | ------------------------------- | |
7095 | ||
7096 | function Compile_Time_Known_Bounds (Typ : Entity_Id) return Boolean is | |
7097 | begin | |
7098 | return | |
7099 | Compile_Time_Known_Value (Type_Low_Bound (Typ)) | |
7100 | and then | |
7101 | Compile_Time_Known_Value (Type_High_Bound (Typ)); | |
7102 | end Compile_Time_Known_Bounds; | |
7103 | ||
996ae0b0 RK |
7104 | ---------------- |
7105 | -- Fore_Value -- | |
7106 | ---------------- | |
7107 | ||
7108 | -- Note that the Fore calculation is based on the actual values | |
7109 | -- of the bounds, and does not take into account possible rounding. | |
7110 | ||
7111 | function Fore_Value return Nat is | |
7112 | Lo : constant Uint := Expr_Value (Type_Low_Bound (P_Type)); | |
7113 | Hi : constant Uint := Expr_Value (Type_High_Bound (P_Type)); | |
7114 | Small : constant Ureal := Small_Value (P_Type); | |
7115 | Lo_Real : constant Ureal := Lo * Small; | |
7116 | Hi_Real : constant Ureal := Hi * Small; | |
7117 | T : Ureal; | |
7118 | R : Nat; | |
7119 | ||
7120 | begin | |
7121 | -- Bounds are given in terms of small units, so first compute | |
7122 | -- proper values as reals. | |
7123 | ||
7124 | T := UR_Max (abs Lo_Real, abs Hi_Real); | |
7125 | R := 2; | |
7126 | ||
7127 | -- Loop to compute proper value if more than one digit required | |
7128 | ||
7129 | while T >= Ureal_10 loop | |
7130 | R := R + 1; | |
7131 | T := T / Ureal_10; | |
7132 | end loop; | |
7133 | ||
7134 | return R; | |
7135 | end Fore_Value; | |
7136 | ||
7137 | -------------- | |
7138 | -- Mantissa -- | |
7139 | -------------- | |
7140 | ||
7141 | -- Table of mantissa values accessed by function Computed using | |
7142 | -- the relation: | |
7143 | ||
7144 | -- T'Mantissa = integer next above (D * log(10)/log(2)) + 1) | |
7145 | ||
7146 | -- where D is T'Digits (RM83 3.5.7) | |
7147 | ||
7148 | Mantissa_Value : constant array (Nat range 1 .. 40) of Nat := ( | |
7149 | 1 => 5, | |
7150 | 2 => 8, | |
7151 | 3 => 11, | |
7152 | 4 => 15, | |
7153 | 5 => 18, | |
7154 | 6 => 21, | |
7155 | 7 => 25, | |
7156 | 8 => 28, | |
7157 | 9 => 31, | |
7158 | 10 => 35, | |
7159 | 11 => 38, | |
7160 | 12 => 41, | |
7161 | 13 => 45, | |
7162 | 14 => 48, | |
7163 | 15 => 51, | |
7164 | 16 => 55, | |
7165 | 17 => 58, | |
7166 | 18 => 61, | |
7167 | 19 => 65, | |
7168 | 20 => 68, | |
7169 | 21 => 71, | |
7170 | 22 => 75, | |
7171 | 23 => 78, | |
7172 | 24 => 81, | |
7173 | 25 => 85, | |
7174 | 26 => 88, | |
7175 | 27 => 91, | |
7176 | 28 => 95, | |
7177 | 29 => 98, | |
7178 | 30 => 101, | |
7179 | 31 => 104, | |
7180 | 32 => 108, | |
7181 | 33 => 111, | |
7182 | 34 => 114, | |
7183 | 35 => 118, | |
7184 | 36 => 121, | |
7185 | 37 => 124, | |
7186 | 38 => 128, | |
7187 | 39 => 131, | |
7188 | 40 => 134); | |
7189 | ||
7190 | function Mantissa return Uint is | |
7191 | begin | |
7192 | return | |
7193 | UI_From_Int (Mantissa_Value (UI_To_Int (Digits_Value (P_Type)))); | |
7194 | end Mantissa; | |
7195 | ||
7196 | ---------------- | |
7197 | -- Set_Bounds -- | |
7198 | ---------------- | |
7199 | ||
7200 | procedure Set_Bounds is | |
7201 | Ndim : Nat; | |
7202 | Indx : Node_Id; | |
7203 | Ityp : Entity_Id; | |
7204 | ||
7205 | begin | |
7206 | -- For a string literal subtype, we have to construct the bounds. | |
7207 | -- Valid Ada code never applies attributes to string literals, but | |
7208 | -- it is convenient to allow the expander to generate attribute | |
7209 | -- references of this type (e.g. First and Last applied to a string | |
7210 | -- literal). | |
7211 | ||
7212 | -- Note that the whole point of the E_String_Literal_Subtype is to | |
7213 | -- avoid this construction of bounds, but the cases in which we | |
a90bd866 | 7214 | -- have to materialize them are rare enough that we don't worry. |
996ae0b0 RK |
7215 | |
7216 | -- The low bound is simply the low bound of the base type. The | |
7217 | -- high bound is computed from the length of the string and this | |
7218 | -- low bound. | |
7219 | ||
7220 | if Ekind (P_Type) = E_String_Literal_Subtype then | |
fbf5a39b AC |
7221 | Ityp := Etype (First_Index (Base_Type (P_Type))); |
7222 | Lo_Bound := Type_Low_Bound (Ityp); | |
996ae0b0 RK |
7223 | |
7224 | Hi_Bound := | |
7225 | Make_Integer_Literal (Sloc (P), | |
7226 | Intval => | |
7227 | Expr_Value (Lo_Bound) + String_Literal_Length (P_Type) - 1); | |
7228 | ||
7229 | Set_Parent (Hi_Bound, P); | |
7230 | Analyze_And_Resolve (Hi_Bound, Etype (Lo_Bound)); | |
7231 | return; | |
7232 | ||
7233 | -- For non-array case, just get bounds of scalar type | |
7234 | ||
7235 | elsif Is_Scalar_Type (P_Type) then | |
7236 | Ityp := P_Type; | |
7237 | ||
fbf5a39b AC |
7238 | -- For a fixed-point type, we must freeze to get the attributes |
7239 | -- of the fixed-point type set now so we can reference them. | |
7240 | ||
7fb754a1 GB |
7241 | if Is_Fixed_Point_Type (P_Type) |
7242 | and then not Is_Frozen (Base_Type (P_Type)) | |
7243 | and then Compile_Time_Known_Value (Type_Low_Bound (P_Type)) | |
7244 | and then Compile_Time_Known_Value (Type_High_Bound (P_Type)) | |
7245 | then | |
7246 | Freeze_Fixed_Point_Type (Base_Type (P_Type)); | |
7247 | end if; | |
7248 | ||
996ae0b0 RK |
7249 | -- For array case, get type of proper index |
7250 | ||
7251 | else | |
7252 | if No (E1) then | |
7253 | Ndim := 1; | |
7254 | else | |
7255 | Ndim := UI_To_Int (Expr_Value (E1)); | |
7256 | end if; | |
7257 | ||
7258 | Indx := First_Index (P_Type); | |
7259 | for J in 1 .. Ndim - 1 loop | |
7260 | Next_Index (Indx); | |
7261 | end loop; | |
7262 | ||
7263 | -- If no index type, get out (some other error occurred, and | |
a90bd866 | 7264 | -- we don't have enough information to complete the job). |
996ae0b0 RK |
7265 | |
7266 | if No (Indx) then | |
7267 | Lo_Bound := Error; | |
7268 | Hi_Bound := Error; | |
7269 | return; | |
7270 | end if; | |
7271 | ||
7272 | Ityp := Etype (Indx); | |
7273 | end if; | |
7274 | ||
7275 | -- A discrete range in an index constraint is allowed to be a | |
7276 | -- subtype indication. This is syntactically a pain, but should | |
7277 | -- not propagate to the entity for the corresponding index subtype. | |
7278 | -- After checking that the subtype indication is legal, the range | |
7279 | -- of the subtype indication should be transfered to the entity. | |
7280 | -- The attributes for the bounds should remain the simple retrievals | |
7281 | -- that they are now. | |
7282 | ||
7283 | Lo_Bound := Type_Low_Bound (Ityp); | |
7284 | Hi_Bound := Type_High_Bound (Ityp); | |
7285 | ||
edab6088 RD |
7286 | -- If subtype is non-static, result is definitely non-static |
7287 | ||
fbf5a39b AC |
7288 | if not Is_Static_Subtype (Ityp) then |
7289 | Static := False; | |
edab6088 RD |
7290 | Set_Is_Static_Expression (N, False); |
7291 | ||
7292 | -- Subtype is static, does it raise CE? | |
7293 | ||
7294 | elsif not Is_OK_Static_Subtype (Ityp) then | |
7295 | Set_Raises_Constraint_Error (N); | |
fbf5a39b | 7296 | end if; |
996ae0b0 RK |
7297 | end Set_Bounds; |
7298 | ||
c4e5e10f TQ |
7299 | ------------------------------- |
7300 | -- Statically_Denotes_Entity -- | |
7301 | ------------------------------- | |
7302 | ||
7303 | function Statically_Denotes_Entity (N : Node_Id) return Boolean is | |
7304 | E : Entity_Id; | |
7305 | ||
7306 | begin | |
7307 | if not Is_Entity_Name (N) then | |
7308 | return False; | |
7309 | else | |
7310 | E := Entity (N); | |
7311 | end if; | |
7312 | ||
7313 | return | |
7314 | Nkind (Parent (E)) /= N_Object_Renaming_Declaration | |
7315 | or else Statically_Denotes_Entity (Renamed_Object (E)); | |
7316 | end Statically_Denotes_Entity; | |
7317 | ||
996ae0b0 RK |
7318 | -- Start of processing for Eval_Attribute |
7319 | ||
7320 | begin | |
edab6088 RD |
7321 | -- Initialize result as non-static, will be reset if appropriate |
7322 | ||
7323 | Set_Is_Static_Expression (N, False); | |
7324 | Static := False; | |
7325 | ||
c159409f AC |
7326 | -- Acquire first two expressions (at the moment, no attributes take more |
7327 | -- than two expressions in any case). | |
996ae0b0 RK |
7328 | |
7329 | if Present (Expressions (N)) then | |
7330 | E1 := First (Expressions (N)); | |
7331 | E2 := Next (E1); | |
7332 | else | |
7333 | E1 := Empty; | |
7334 | E2 := Empty; | |
7335 | end if; | |
7336 | ||
442ade9d RD |
7337 | -- Special processing for Enabled attribute. This attribute has a very |
7338 | -- special prefix, and the easiest way to avoid lots of special checks | |
7339 | -- to protect this special prefix from causing trouble is to deal with | |
7340 | -- this attribute immediately and be done with it. | |
7341 | ||
7342 | if Id = Attribute_Enabled then | |
7343 | ||
442ade9d RD |
7344 | -- We skip evaluation if the expander is not active. This is not just |
7345 | -- an optimization. It is of key importance that we not rewrite the | |
7346 | -- attribute in a generic template, since we want to pick up the | |
774454ac AC |
7347 | -- setting of the check in the instance, Testing Expander_Active |
7348 | -- might seem an easy way of doing this, but we need to account for | |
7349 | -- ASIS needs, so check explicitly for a generic context. | |
442ade9d | 7350 | |
774454ac | 7351 | if not Inside_A_Generic then |
442ade9d RD |
7352 | declare |
7353 | C : constant Check_Id := Get_Check_Id (Chars (P)); | |
7354 | R : Boolean; | |
7355 | ||
7356 | begin | |
7357 | if No (E1) then | |
7358 | if C in Predefined_Check_Id then | |
3217f71e | 7359 | R := Scope_Suppress.Suppress (C); |
442ade9d RD |
7360 | else |
7361 | R := Is_Check_Suppressed (Empty, C); | |
7362 | end if; | |
7363 | ||
7364 | else | |
7365 | R := Is_Check_Suppressed (Entity (E1), C); | |
7366 | end if; | |
7367 | ||
21791d97 | 7368 | Rewrite (N, New_Occurrence_Of (Boolean_Literals (not R), Loc)); |
442ade9d RD |
7369 | end; |
7370 | end if; | |
7371 | ||
7372 | return; | |
7373 | end if; | |
7374 | ||
21db8699 RD |
7375 | -- Attribute 'Img applied to a static enumeration value is static, and |
7376 | -- we will do the folding right here (things get confused if we let this | |
7377 | -- case go through the normal circuitry). | |
7378 | ||
7379 | if Attribute_Name (N) = Name_Img | |
7380 | and then Is_Entity_Name (P) | |
7381 | and then Is_Enumeration_Type (Etype (Entity (P))) | |
7382 | and then Is_OK_Static_Expression (P) | |
7383 | then | |
7384 | declare | |
7385 | Lit : constant Entity_Id := Expr_Value_E (P); | |
7386 | Str : String_Id; | |
7387 | ||
7388 | begin | |
7389 | Start_String; | |
7390 | Get_Unqualified_Decoded_Name_String (Chars (Lit)); | |
7391 | Set_Casing (All_Upper_Case); | |
7392 | Store_String_Chars (Name_Buffer (1 .. Name_Len)); | |
7393 | Str := End_String; | |
7394 | ||
7395 | Rewrite (N, Make_String_Literal (Loc, Strval => Str)); | |
7396 | Analyze_And_Resolve (N, Standard_String); | |
7397 | Set_Is_Static_Expression (N, True); | |
7398 | end; | |
7399 | ||
7400 | return; | |
7401 | end if; | |
7402 | ||
ca7e6c26 AC |
7403 | -- Special processing for cases where the prefix is an object. For this |
7404 | -- purpose, a string literal counts as an object (attributes of string | |
7405 | -- literals can only appear in generated code). | |
996ae0b0 | 7406 | |
fbf5a39b | 7407 | if Is_Object_Reference (P) or else Nkind (P) = N_String_Literal then |
996ae0b0 RK |
7408 | |
7409 | -- For Component_Size, the prefix is an array object, and we apply | |
ca7e6c26 AC |
7410 | -- the attribute to the type of the object. This is allowed for both |
7411 | -- unconstrained and constrained arrays, since the bounds have no | |
7412 | -- influence on the value of this attribute. | |
996ae0b0 RK |
7413 | |
7414 | if Id = Attribute_Component_Size then | |
7415 | P_Entity := Etype (P); | |
7416 | ||
ca7e6c26 AC |
7417 | -- For Enum_Rep, evaluation depends on the nature of the prefix and |
7418 | -- the optional argument. | |
7419 | ||
7420 | elsif Id = Attribute_Enum_Rep then | |
7421 | if Is_Entity_Name (P) then | |
7422 | ||
f3e0f7c3 BD |
7423 | declare |
7424 | Enum_Expr : Node_Id; | |
7425 | -- The enumeration-type expression of interest | |
0c3f76ba | 7426 | |
f3e0f7c3 BD |
7427 | begin |
7428 | -- P'Enum_Rep case | |
ca7e6c26 | 7429 | |
0c3f76ba AC |
7430 | if Ekind_In (Entity (P), E_Constant, |
7431 | E_Enumeration_Literal) | |
f3e0f7c3 BD |
7432 | then |
7433 | Enum_Expr := P; | |
ca7e6c26 | 7434 | |
f3e0f7c3 | 7435 | -- Enum_Type'Enum_Rep (E1) case |
ca7e6c26 | 7436 | |
f3e0f7c3 BD |
7437 | elsif Is_Enumeration_Type (Entity (P)) then |
7438 | Enum_Expr := E1; | |
ca7e6c26 | 7439 | |
f3e0f7c3 BD |
7440 | -- Otherwise the attribute must be expanded into a |
7441 | -- conversion and evaluated at run time. | |
ca7e6c26 | 7442 | |
f3e0f7c3 BD |
7443 | else |
7444 | Check_Expressions; | |
7445 | return; | |
7446 | end if; | |
7447 | ||
7448 | -- We can fold if the expression is an enumeration | |
0c3f76ba AC |
7449 | -- literal, or if it denotes a constant whose value |
7450 | -- is known at compile time. | |
f3e0f7c3 BD |
7451 | |
7452 | if Nkind (Enum_Expr) in N_Has_Entity | |
7453 | and then (Ekind (Entity (Enum_Expr)) = | |
7454 | E_Enumeration_Literal | |
7455 | or else | |
7456 | (Ekind (Entity (Enum_Expr)) = E_Constant | |
7457 | and then Nkind (Parent (Entity (Enum_Expr))) = | |
7458 | N_Object_Declaration | |
0c3f76ba | 7459 | and then Compile_Time_Known_Value |
f3e0f7c3 BD |
7460 | (Expression (Parent (Entity (P)))))) |
7461 | then | |
7462 | P_Entity := Etype (P); | |
7463 | else | |
7464 | Check_Expressions; | |
7465 | return; | |
7466 | end if; | |
7467 | end; | |
ca7e6c26 AC |
7468 | |
7469 | -- Otherwise the attribute is illegal, do not attempt to perform | |
7470 | -- any kind of folding. | |
7471 | ||
7472 | else | |
7473 | return; | |
7474 | end if; | |
7475 | ||
996ae0b0 RK |
7476 | -- For First and Last, the prefix is an array object, and we apply |
7477 | -- the attribute to the type of the array, but we need a constrained | |
7478 | -- type for this, so we use the actual subtype if available. | |
7479 | ||
edab6088 RD |
7480 | elsif Id = Attribute_First or else |
7481 | Id = Attribute_Last or else | |
996ae0b0 RK |
7482 | Id = Attribute_Length |
7483 | then | |
7484 | declare | |
7485 | AS : constant Entity_Id := Get_Actual_Subtype_If_Available (P); | |
7486 | ||
7487 | begin | |
fbf5a39b | 7488 | if Present (AS) and then Is_Constrained (AS) then |
996ae0b0 RK |
7489 | P_Entity := AS; |
7490 | ||
df46b832 | 7491 | -- If we have an unconstrained type we cannot fold |
996ae0b0 RK |
7492 | |
7493 | else | |
7494 | Check_Expressions; | |
7495 | return; | |
7496 | end if; | |
7497 | end; | |
7498 | ||
7499 | -- For Size, give size of object if available, otherwise we | |
7500 | -- cannot fold Size. | |
7501 | ||
7502 | elsif Id = Attribute_Size then | |
996ae0b0 RK |
7503 | if Is_Entity_Name (P) |
7504 | and then Known_Esize (Entity (P)) | |
7505 | then | |
32213142 | 7506 | Compile_Time_Known_Attribute (N, Esize (Entity (P))); |
996ae0b0 RK |
7507 | return; |
7508 | ||
7509 | else | |
7510 | Check_Expressions; | |
7511 | return; | |
7512 | end if; | |
7513 | ||
7514 | -- For Alignment, give size of object if available, otherwise we | |
7515 | -- cannot fold Alignment. | |
7516 | ||
7517 | elsif Id = Attribute_Alignment then | |
996ae0b0 RK |
7518 | if Is_Entity_Name (P) |
7519 | and then Known_Alignment (Entity (P)) | |
7520 | then | |
edab6088 | 7521 | Fold_Uint (N, Alignment (Entity (P)), Static); |
996ae0b0 RK |
7522 | return; |
7523 | ||
7524 | else | |
7525 | Check_Expressions; | |
7526 | return; | |
7527 | end if; | |
7528 | ||
0ebc109a VP |
7529 | -- For Lock_Free, we apply the attribute to the type of the object. |
7530 | -- This is allowed since we have already verified that the type is a | |
7531 | -- protected type. | |
7532 | ||
7533 | elsif Id = Attribute_Lock_Free then | |
7534 | P_Entity := Etype (P); | |
7535 | ||
996ae0b0 RK |
7536 | -- No other attributes for objects are folded |
7537 | ||
7538 | else | |
7539 | Check_Expressions; | |
7540 | return; | |
7541 | end if; | |
7542 | ||
f7ea2603 RD |
7543 | -- Cases where P is not an object. Cannot do anything if P is not the |
7544 | -- name of an entity. | |
996ae0b0 RK |
7545 | |
7546 | elsif not Is_Entity_Name (P) then | |
7547 | Check_Expressions; | |
7548 | return; | |
7549 | ||
7550 | -- Otherwise get prefix entity | |
7551 | ||
7552 | else | |
7553 | P_Entity := Entity (P); | |
7554 | end if; | |
7555 | ||
edab6088 RD |
7556 | -- If we are asked to evaluate an attribute where the prefix is a |
7557 | -- non-frozen generic actual type whose RM_Size is still set to zero, | |
4bd4bb7f | 7558 | -- then abandon the effort. |
edab6088 RD |
7559 | |
7560 | if Is_Type (P_Entity) | |
7561 | and then (not Is_Frozen (P_Entity) | |
7562 | and then Is_Generic_Actual_Type (P_Entity) | |
7563 | and then RM_Size (P_Entity) = 0) | |
4bd4bb7f AC |
7564 | |
7565 | -- However, the attribute Unconstrained_Array must be evaluated, | |
7566 | -- since it is documented to be a static attribute (and can for | |
7567 | -- example appear in a Compile_Time_Warning pragma). The frozen | |
7568 | -- status of the type does not affect its evaluation. | |
7569 | ||
7570 | and then Id /= Attribute_Unconstrained_Array | |
edab6088 RD |
7571 | then |
7572 | return; | |
7573 | end if; | |
7574 | ||
996ae0b0 RK |
7575 | -- At this stage P_Entity is the entity to which the attribute |
7576 | -- is to be applied. This is usually simply the entity of the | |
7577 | -- prefix, except in some cases of attributes for objects, where | |
7578 | -- as described above, we apply the attribute to the object type. | |
7579 | ||
edab6088 RD |
7580 | -- Here is where we make sure that static attributes are properly |
7581 | -- marked as such. These are attributes whose prefix is a static | |
7582 | -- scalar subtype, whose result is scalar, and whose arguments, if | |
7583 | -- present, are static scalar expressions. Note that such references | |
7584 | -- are static expressions even if they raise Constraint_Error. | |
7585 | ||
7586 | -- For example, Boolean'Pos (1/0 = 0) is a static expression, even | |
7587 | -- though evaluating it raises constraint error. This means that a | |
7588 | -- declaration like: | |
7589 | ||
7590 | -- X : constant := (if True then 1 else Boolean'Pos (1/0 = 0)); | |
7591 | ||
7592 | -- is legal, since here this expression appears in a statically | |
7593 | -- unevaluated position, so it does not actually raise an exception. | |
7594 | ||
7595 | if Is_Scalar_Type (P_Entity) | |
7596 | and then (not Is_Generic_Type (P_Entity)) | |
7597 | and then Is_Static_Subtype (P_Entity) | |
7598 | and then Is_Scalar_Type (Etype (N)) | |
7599 | and then | |
7600 | (No (E1) | |
7601 | or else (Is_Static_Expression (E1) | |
7602 | and then Is_Scalar_Type (Etype (E1)))) | |
7603 | and then | |
7604 | (No (E2) | |
7605 | or else (Is_Static_Expression (E2) | |
7606 | and then Is_Scalar_Type (Etype (E1)))) | |
7607 | then | |
7608 | Static := True; | |
7609 | Set_Is_Static_Expression (N, True); | |
7610 | end if; | |
7611 | ||
996ae0b0 RK |
7612 | -- First foldable possibility is a scalar or array type (RM 4.9(7)) |
7613 | -- that is not generic (generic types are eliminated by RM 4.9(25)). | |
7614 | -- Note we allow non-static non-generic types at this stage as further | |
7615 | -- described below. | |
7616 | ||
7617 | if Is_Type (P_Entity) | |
7618 | and then (Is_Scalar_Type (P_Entity) or Is_Array_Type (P_Entity)) | |
7619 | and then (not Is_Generic_Type (P_Entity)) | |
7620 | then | |
7621 | P_Type := P_Entity; | |
7622 | ||
7623 | -- Second foldable possibility is an array object (RM 4.9(8)) | |
7624 | ||
21db8699 | 7625 | elsif Ekind_In (P_Entity, E_Variable, E_Constant) |
996ae0b0 RK |
7626 | and then Is_Array_Type (Etype (P_Entity)) |
7627 | and then (not Is_Generic_Type (Etype (P_Entity))) | |
7628 | then | |
7629 | P_Type := Etype (P_Entity); | |
7630 | ||
b8dc622e JM |
7631 | -- If the entity is an array constant with an unconstrained nominal |
7632 | -- subtype then get the type from the initial value. If the value has | |
7633 | -- been expanded into assignments, there is no expression and the | |
7634 | -- attribute reference remains dynamic. | |
4c4e9ad2 | 7635 | |
996ae0b0 RK |
7636 | -- We could do better here and retrieve the type ??? |
7637 | ||
7638 | if Ekind (P_Entity) = E_Constant | |
7639 | and then not Is_Constrained (P_Type) | |
7640 | then | |
7641 | if No (Constant_Value (P_Entity)) then | |
7642 | return; | |
7643 | else | |
7644 | P_Type := Etype (Constant_Value (P_Entity)); | |
7645 | end if; | |
7646 | end if; | |
7647 | ||
edab6088 RD |
7648 | -- Definite must be folded if the prefix is not a generic type, that |
7649 | -- is to say if we are within an instantiation. Same processing applies | |
7650 | -- to the GNAT attributes Atomic_Always_Lock_Free, Has_Discriminants, | |
7651 | -- Lock_Free, Type_Class, Has_Tagged_Value, and Unconstrained_Array. | |
996ae0b0 | 7652 | |
edab6088 RD |
7653 | elsif (Id = Attribute_Atomic_Always_Lock_Free or else |
7654 | Id = Attribute_Definite or else | |
7655 | Id = Attribute_Has_Access_Values or else | |
7656 | Id = Attribute_Has_Discriminants or else | |
7657 | Id = Attribute_Has_Tagged_Values or else | |
7658 | Id = Attribute_Lock_Free or else | |
7659 | Id = Attribute_Type_Class or else | |
7660 | Id = Attribute_Unconstrained_Array or else | |
4adf3c50 | 7661 | Id = Attribute_Max_Alignment_For_Allocation) |
996ae0b0 RK |
7662 | and then not Is_Generic_Type (P_Entity) |
7663 | then | |
7664 | P_Type := P_Entity; | |
7665 | ||
e10dab7f JM |
7666 | -- We can fold 'Size applied to a type if the size is known (as happens |
7667 | -- for a size from an attribute definition clause). At this stage, this | |
7668 | -- can happen only for types (e.g. record types) for which the size is | |
7669 | -- always non-static. We exclude generic types from consideration (since | |
7670 | -- they have bogus sizes set within templates). | |
996ae0b0 RK |
7671 | |
7672 | elsif Id = Attribute_Size | |
7673 | and then Is_Type (P_Entity) | |
7674 | and then (not Is_Generic_Type (P_Entity)) | |
7675 | and then Known_Static_RM_Size (P_Entity) | |
7676 | then | |
32213142 | 7677 | Compile_Time_Known_Attribute (N, RM_Size (P_Entity)); |
996ae0b0 RK |
7678 | return; |
7679 | ||
fbf5a39b AC |
7680 | -- We can fold 'Alignment applied to a type if the alignment is known |
7681 | -- (as happens for an alignment from an attribute definition clause). | |
f7ea2603 RD |
7682 | -- At this stage, this can happen only for types (e.g. record types) for |
7683 | -- which the size is always non-static. We exclude generic types from | |
7684 | -- consideration (since they have bogus sizes set within templates). | |
fbf5a39b AC |
7685 | |
7686 | elsif Id = Attribute_Alignment | |
7687 | and then Is_Type (P_Entity) | |
7688 | and then (not Is_Generic_Type (P_Entity)) | |
7689 | and then Known_Alignment (P_Entity) | |
7690 | then | |
7691 | Compile_Time_Known_Attribute (N, Alignment (P_Entity)); | |
7692 | return; | |
7693 | ||
acd47d2a AC |
7694 | -- If this is an access attribute that is known to fail accessibility |
7695 | -- check, rewrite accordingly. | |
7696 | ||
7697 | elsif Attribute_Name (N) = Name_Access | |
7698 | and then Raises_Constraint_Error (N) | |
7699 | then | |
7700 | Rewrite (N, | |
c01a9391 AC |
7701 | Make_Raise_Program_Error (Loc, |
7702 | Reason => PE_Accessibility_Check_Failed)); | |
acd47d2a AC |
7703 | Set_Etype (N, C_Type); |
7704 | return; | |
7705 | ||
996ae0b0 | 7706 | -- No other cases are foldable (they certainly aren't static, and at |
2a1f6a1f | 7707 | -- the moment we don't try to fold any cases other than the ones above). |
996ae0b0 RK |
7708 | |
7709 | else | |
7710 | Check_Expressions; | |
7711 | return; | |
7712 | end if; | |
7713 | ||
7714 | -- If either attribute or the prefix is Any_Type, then propagate | |
7715 | -- Any_Type to the result and don't do anything else at all. | |
7716 | ||
7717 | if P_Type = Any_Type | |
7718 | or else (Present (E1) and then Etype (E1) = Any_Type) | |
7719 | or else (Present (E2) and then Etype (E2) = Any_Type) | |
7720 | then | |
7721 | Set_Etype (N, Any_Type); | |
7722 | return; | |
7723 | end if; | |
7724 | ||
7725 | -- Scalar subtype case. We have not yet enforced the static requirement | |
7726 | -- of (RM 4.9(7)) and we don't intend to just yet, since there are cases | |
7727 | -- of non-static attribute references (e.g. S'Digits for a non-static | |
7728 | -- floating-point type, which we can compute at compile time). | |
7729 | ||
7730 | -- Note: this folding of non-static attributes is not simply a case of | |
7731 | -- optimization. For many of the attributes affected, Gigi cannot handle | |
7732 | -- the attribute and depends on the front end having folded them away. | |
7733 | ||
7734 | -- Note: although we don't require staticness at this stage, we do set | |
7735 | -- the Static variable to record the staticness, for easy reference by | |
7736 | -- those attributes where it matters (e.g. Succ and Pred), and also to | |
7737 | -- be used to ensure that non-static folded things are not marked as | |
7738 | -- being static (a check that is done right at the end). | |
7739 | ||
7740 | P_Root_Type := Root_Type (P_Type); | |
7741 | P_Base_Type := Base_Type (P_Type); | |
7742 | ||
7743 | -- If the root type or base type is generic, then we cannot fold. This | |
7744 | -- test is needed because subtypes of generic types are not always | |
7745 | -- marked as being generic themselves (which seems odd???) | |
7746 | ||
7747 | if Is_Generic_Type (P_Root_Type) | |
7748 | or else Is_Generic_Type (P_Base_Type) | |
7749 | then | |
7750 | return; | |
7751 | end if; | |
7752 | ||
7753 | if Is_Scalar_Type (P_Type) then | |
edab6088 RD |
7754 | if not Is_Static_Subtype (P_Type) then |
7755 | Static := False; | |
7756 | Set_Is_Static_Expression (N, False); | |
7757 | elsif not Is_OK_Static_Subtype (P_Type) then | |
7758 | Set_Raises_Constraint_Error (N); | |
7759 | end if; | |
996ae0b0 RK |
7760 | |
7761 | -- Array case. We enforce the constrained requirement of (RM 4.9(7-8)) | |
7762 | -- since we can't do anything with unconstrained arrays. In addition, | |
7763 | -- only the First, Last and Length attributes are possibly static. | |
996ae0b0 | 7764 | |
0ebc109a VP |
7765 | -- Atomic_Always_Lock_Free, Definite, Has_Access_Values, |
7766 | -- Has_Discriminants, Has_Tagged_Values, Lock_Free, Type_Class, and | |
7767 | -- Unconstrained_Array are again exceptions, because they apply as well | |
7768 | -- to unconstrained types. | |
996ae0b0 | 7769 | |
c4e5e10f TQ |
7770 | -- In addition Component_Size is an exception since it is possibly |
7771 | -- foldable, even though it is never static, and it does apply to | |
7772 | -- unconstrained arrays. Furthermore, it is essential to fold this | |
7773 | -- in the packed case, since otherwise the value will be incorrect. | |
7774 | ||
edab6088 RD |
7775 | elsif Id = Attribute_Atomic_Always_Lock_Free or else |
7776 | Id = Attribute_Definite or else | |
7777 | Id = Attribute_Has_Access_Values or else | |
7778 | Id = Attribute_Has_Discriminants or else | |
7779 | Id = Attribute_Has_Tagged_Values or else | |
7780 | Id = Attribute_Lock_Free or else | |
7781 | Id = Attribute_Type_Class or else | |
7782 | Id = Attribute_Unconstrained_Array or else | |
c4e5e10f | 7783 | Id = Attribute_Component_Size |
996ae0b0 RK |
7784 | then |
7785 | Static := False; | |
edab6088 | 7786 | Set_Is_Static_Expression (N, False); |
996ae0b0 | 7787 | |
4adf3c50 | 7788 | elsif Id /= Attribute_Max_Alignment_For_Allocation then |
996ae0b0 | 7789 | if not Is_Constrained (P_Type) |
c4e5e10f TQ |
7790 | or else (Id /= Attribute_First and then |
7791 | Id /= Attribute_Last and then | |
996ae0b0 RK |
7792 | Id /= Attribute_Length) |
7793 | then | |
7794 | Check_Expressions; | |
7795 | return; | |
7796 | end if; | |
7797 | ||
7798 | -- The rules in (RM 4.9(7,8)) require a static array, but as in the | |
7799 | -- scalar case, we hold off on enforcing staticness, since there are | |
7800 | -- cases which we can fold at compile time even though they are not | |
7801 | -- static (e.g. 'Length applied to a static index, even though other | |
7802 | -- non-static indexes make the array type non-static). This is only | |
fbf5a39b | 7803 | -- an optimization, but it falls out essentially free, so why not. |
996ae0b0 RK |
7804 | -- Again we compute the variable Static for easy reference later |
7805 | -- (note that no array attributes are static in Ada 83). | |
8dbd1460 | 7806 | |
2ddc2000 | 7807 | -- We also need to set Static properly for subsequent legality checks |
df46b832 AC |
7808 | -- which might otherwise accept non-static constants in contexts |
7809 | -- where they are not legal. | |
996ae0b0 | 7810 | |
edab6088 RD |
7811 | Static := |
7812 | Ada_Version >= Ada_95 and then Statically_Denotes_Entity (P); | |
7813 | Set_Is_Static_Expression (N, Static); | |
996ae0b0 RK |
7814 | |
7815 | declare | |
edab6088 | 7816 | Nod : Node_Id; |
996ae0b0 RK |
7817 | |
7818 | begin | |
edab6088 | 7819 | Nod := First_Index (P_Type); |
df46b832 AC |
7820 | |
7821 | -- The expression is static if the array type is constrained | |
7822 | -- by given bounds, and not by an initial expression. Constant | |
7823 | -- strings are static in any case. | |
7824 | ||
7825 | if Root_Type (P_Type) /= Standard_String then | |
7826 | Static := | |
7827 | Static and then not Is_Constr_Subt_For_U_Nominal (P_Type); | |
edab6088 | 7828 | Set_Is_Static_Expression (N, Static); |
df46b832 AC |
7829 | end if; |
7830 | ||
edab6088 RD |
7831 | while Present (Nod) loop |
7832 | if not Is_Static_Subtype (Etype (Nod)) then | |
7833 | Static := False; | |
7834 | Set_Is_Static_Expression (N, False); | |
99425ec3 | 7835 | |
edab6088 RD |
7836 | elsif not Is_OK_Static_Subtype (Etype (Nod)) then |
7837 | Set_Raises_Constraint_Error (N); | |
99425ec3 AC |
7838 | Static := False; |
7839 | Set_Is_Static_Expression (N, False); | |
edab6088 | 7840 | end if; |
fbf5a39b | 7841 | |
b4d7b435 AC |
7842 | -- If however the index type is generic, or derived from |
7843 | -- one, attributes cannot be folded. | |
fbf5a39b | 7844 | |
edab6088 | 7845 | if Is_Generic_Type (Root_Type (Etype (Nod))) |
fbf5a39b AC |
7846 | and then Id /= Attribute_Component_Size |
7847 | then | |
7848 | return; | |
7849 | end if; | |
7850 | ||
edab6088 | 7851 | Next_Index (Nod); |
996ae0b0 RK |
7852 | end loop; |
7853 | end; | |
7854 | end if; | |
7855 | ||
7856 | -- Check any expressions that are present. Note that these expressions, | |
7857 | -- depending on the particular attribute type, are either part of the | |
7858 | -- attribute designator, or they are arguments in a case where the | |
7859 | -- attribute reference returns a function. In the latter case, the | |
7860 | -- rule in (RM 4.9(22)) applies and in particular requires the type | |
7861 | -- of the expressions to be scalar in order for the attribute to be | |
7862 | -- considered to be static. | |
7863 | ||
7864 | declare | |
7865 | E : Node_Id; | |
7866 | ||
7867 | begin | |
7868 | E := E1; | |
99425ec3 | 7869 | |
996ae0b0 RK |
7870 | while Present (E) loop |
7871 | ||
7872 | -- If expression is not static, then the attribute reference | |
fbf5a39b AC |
7873 | -- result certainly cannot be static. |
7874 | ||
7875 | if not Is_Static_Expression (E) then | |
7876 | Static := False; | |
edab6088 RD |
7877 | Set_Is_Static_Expression (N, False); |
7878 | end if; | |
7879 | ||
7880 | if Raises_Constraint_Error (E) then | |
7881 | Set_Raises_Constraint_Error (N); | |
fbf5a39b | 7882 | end if; |
996ae0b0 | 7883 | |
fbf5a39b AC |
7884 | -- If the result is not known at compile time, or is not of |
7885 | -- a scalar type, then the result is definitely not static, | |
7886 | -- so we can quit now. | |
996ae0b0 | 7887 | |
fbf5a39b | 7888 | if not Compile_Time_Known_Value (E) |
996ae0b0 RK |
7889 | or else not Is_Scalar_Type (Etype (E)) |
7890 | then | |
fbf5a39b AC |
7891 | -- An odd special case, if this is a Pos attribute, this |
7892 | -- is where we need to apply a range check since it does | |
7893 | -- not get done anywhere else. | |
7894 | ||
996ae0b0 RK |
7895 | if Id = Attribute_Pos then |
7896 | if Is_Integer_Type (Etype (E)) then | |
7897 | Apply_Range_Check (E, Etype (N)); | |
7898 | end if; | |
7899 | end if; | |
7900 | ||
7901 | Check_Expressions; | |
7902 | return; | |
7903 | ||
7904 | -- If the expression raises a constraint error, then so does | |
7905 | -- the attribute reference. We keep going in this case because | |
7906 | -- we are still interested in whether the attribute reference | |
7907 | -- is static even if it is not static. | |
7908 | ||
7909 | elsif Raises_Constraint_Error (E) then | |
7910 | Set_Raises_Constraint_Error (N); | |
7911 | end if; | |
7912 | ||
7913 | Next (E); | |
7914 | end loop; | |
7915 | ||
7916 | if Raises_Constraint_Error (Prefix (N)) then | |
99425ec3 | 7917 | Set_Is_Static_Expression (N, False); |
996ae0b0 RK |
7918 | return; |
7919 | end if; | |
7920 | end; | |
7921 | ||
7922 | -- Deal with the case of a static attribute reference that raises | |
7923 | -- constraint error. The Raises_Constraint_Error flag will already | |
7924 | -- have been set, and the Static flag shows whether the attribute | |
7925 | -- reference is static. In any case we certainly can't fold such an | |
7926 | -- attribute reference. | |
7927 | ||
7928 | -- Note that the rewriting of the attribute node with the constraint | |
7929 | -- error node is essential in this case, because otherwise Gigi might | |
7930 | -- blow up on one of the attributes it never expects to see. | |
7931 | ||
7932 | -- The constraint_error node must have the type imposed by the context, | |
7933 | -- to avoid spurious errors in the enclosing expression. | |
7934 | ||
7935 | if Raises_Constraint_Error (N) then | |
7936 | CE_Node := | |
07fc65c4 GB |
7937 | Make_Raise_Constraint_Error (Sloc (N), |
7938 | Reason => CE_Range_Check_Failed); | |
996ae0b0 RK |
7939 | Set_Etype (CE_Node, Etype (N)); |
7940 | Set_Raises_Constraint_Error (CE_Node); | |
7941 | Check_Expressions; | |
7942 | Rewrite (N, Relocate_Node (CE_Node)); | |
edab6088 | 7943 | Set_Raises_Constraint_Error (N, True); |
996ae0b0 RK |
7944 | return; |
7945 | end if; | |
7946 | ||
7947 | -- At this point we have a potentially foldable attribute reference. | |
7948 | -- If Static is set, then the attribute reference definitely obeys | |
7949 | -- the requirements in (RM 4.9(7,8,22)), and it definitely can be | |
7950 | -- folded. If Static is not set, then the attribute may or may not | |
7951 | -- be foldable, and the individual attribute processing routines | |
7952 | -- test Static as required in cases where it makes a difference. | |
7953 | ||
fbf5a39b | 7954 | -- In the case where Static is not set, we do know that all the |
bb3c784c AC |
7955 | -- expressions present are at least known at compile time (we assumed |
7956 | -- above that if this was not the case, then there was no hope of static | |
7957 | -- evaluation). However, we did not require that the bounds of the | |
7958 | -- prefix type be compile time known, let alone static). That's because | |
7959 | -- there are many attributes that can be computed at compile time on | |
7960 | -- non-static subtypes, even though such references are not static | |
7961 | -- expressions. | |
fbf5a39b | 7962 | |
7b55fea6 AC |
7963 | -- For VAX float, the root type is an IEEE type. So make sure to use the |
7964 | -- base type instead of the root-type for floating point attributes. | |
7965 | ||
996ae0b0 RK |
7966 | case Id is |
7967 | ||
4199e8c6 | 7968 | -- Attributes related to Ada 2012 iterators (placeholder ???) |
0da80d7d | 7969 | |
4199e8c6 RD |
7970 | when Attribute_Constant_Indexing | |
7971 | Attribute_Default_Iterator | | |
7972 | Attribute_Implicit_Dereference | | |
7973 | Attribute_Iterator_Element | | |
7974 | Attribute_Iterable | | |
7975 | Attribute_Variable_Indexing => null; | |
b98e2969 | 7976 | |
4199e8c6 RD |
7977 | -- Internal attributes used to deal with Ada 2012 delayed aspects. |
7978 | -- These were already rejected by the parser. Thus they shouldn't | |
7979 | -- appear here. | |
b98e2969 | 7980 | |
4199e8c6 RD |
7981 | when Internal_Attribute_Id => |
7982 | raise Program_Error; | |
0da80d7d | 7983 | |
996ae0b0 RK |
7984 | -------------- |
7985 | -- Adjacent -- | |
7986 | -------------- | |
7987 | ||
7988 | when Attribute_Adjacent => | |
af31bd57 AC |
7989 | Fold_Ureal |
7990 | (N, | |
7991 | Eval_Fat.Adjacent | |
7992 | (P_Base_Type, Expr_Value_R (E1), Expr_Value_R (E2)), | |
7993 | Static); | |
996ae0b0 RK |
7994 | |
7995 | --------- | |
7996 | -- Aft -- | |
7997 | --------- | |
7998 | ||
7999 | when Attribute_Aft => | |
edab6088 | 8000 | Fold_Uint (N, Aft_Value (P_Type), Static); |
996ae0b0 RK |
8001 | |
8002 | --------------- | |
8003 | -- Alignment -- | |
8004 | --------------- | |
8005 | ||
8006 | when Attribute_Alignment => Alignment_Block : declare | |
8007 | P_TypeA : constant Entity_Id := Underlying_Type (P_Type); | |
8008 | ||
8009 | begin | |
8010 | -- Fold if alignment is set and not otherwise | |
8011 | ||
8012 | if Known_Alignment (P_TypeA) then | |
edab6088 | 8013 | Fold_Uint (N, Alignment (P_TypeA), Static); |
996ae0b0 RK |
8014 | end if; |
8015 | end Alignment_Block; | |
8016 | ||
0ebc109a VP |
8017 | ----------------------------- |
8018 | -- Atomic_Always_Lock_Free -- | |
8019 | ----------------------------- | |
8020 | ||
8021 | -- Atomic_Always_Lock_Free attribute is a Boolean, thus no need to fold | |
8022 | -- here. | |
8023 | ||
8024 | when Attribute_Atomic_Always_Lock_Free => Atomic_Always_Lock_Free : | |
8025 | declare | |
8026 | V : constant Entity_Id := | |
8027 | Boolean_Literals | |
8028 | (Support_Atomic_Primitives_On_Target | |
8029 | and then Support_Atomic_Primitives (P_Type)); | |
8030 | ||
8031 | begin | |
8032 | Rewrite (N, New_Occurrence_Of (V, Loc)); | |
8033 | ||
8034 | -- Analyze and resolve as boolean. Note that this attribute is a | |
8035 | -- static attribute in GNAT. | |
8036 | ||
8037 | Analyze_And_Resolve (N, Standard_Boolean); | |
edab6088 RD |
8038 | Static := True; |
8039 | Set_Is_Static_Expression (N, True); | |
0ebc109a VP |
8040 | end Atomic_Always_Lock_Free; |
8041 | ||
996ae0b0 RK |
8042 | --------- |
8043 | -- Bit -- | |
8044 | --------- | |
8045 | ||
8046 | -- Bit can never be folded | |
8047 | ||
8048 | when Attribute_Bit => | |
8049 | null; | |
8050 | ||
8051 | ------------------ | |
8052 | -- Body_Version -- | |
8053 | ------------------ | |
8054 | ||
8055 | -- Body_version can never be static | |
8056 | ||
8057 | when Attribute_Body_Version => | |
8058 | null; | |
8059 | ||
8060 | ------------- | |
8061 | -- Ceiling -- | |
8062 | ------------- | |
8063 | ||
8064 | when Attribute_Ceiling => | |
af31bd57 AC |
8065 | Fold_Ureal |
8066 | (N, Eval_Fat.Ceiling (P_Base_Type, Expr_Value_R (E1)), Static); | |
996ae0b0 RK |
8067 | |
8068 | -------------------- | |
8069 | -- Component_Size -- | |
8070 | -------------------- | |
8071 | ||
8072 | when Attribute_Component_Size => | |
fbf5a39b | 8073 | if Known_Static_Component_Size (P_Type) then |
edab6088 | 8074 | Fold_Uint (N, Component_Size (P_Type), Static); |
996ae0b0 RK |
8075 | end if; |
8076 | ||
8077 | ------------- | |
8078 | -- Compose -- | |
8079 | ------------- | |
8080 | ||
8081 | when Attribute_Compose => | |
af31bd57 AC |
8082 | Fold_Ureal |
8083 | (N, | |
8084 | Eval_Fat.Compose (P_Base_Type, Expr_Value_R (E1), Expr_Value (E2)), | |
8085 | Static); | |
996ae0b0 RK |
8086 | |
8087 | ----------------- | |
8088 | -- Constrained -- | |
8089 | ----------------- | |
8090 | ||
8091 | -- Constrained is never folded for now, there may be cases that | |
12a13f01 | 8092 | -- could be handled at compile time. To be looked at later. |
996ae0b0 RK |
8093 | |
8094 | when Attribute_Constrained => | |
6c56d9b8 AC |
8095 | |
8096 | -- The expander might fold it and set the static flag accordingly, | |
8097 | -- but with expansion disabled (as in ASIS), it remains as an | |
8098 | -- attribute reference, and this reference is not static. | |
8099 | ||
8100 | Set_Is_Static_Expression (N, False); | |
996ae0b0 RK |
8101 | null; |
8102 | ||
8103 | --------------- | |
8104 | -- Copy_Sign -- | |
8105 | --------------- | |
8106 | ||
8107 | when Attribute_Copy_Sign => | |
af31bd57 AC |
8108 | Fold_Ureal |
8109 | (N, | |
8110 | Eval_Fat.Copy_Sign | |
8111 | (P_Base_Type, Expr_Value_R (E1), Expr_Value_R (E2)), | |
8112 | Static); | |
996ae0b0 | 8113 | |
996ae0b0 RK |
8114 | -------------- |
8115 | -- Definite -- | |
8116 | -------------- | |
8117 | ||
8118 | when Attribute_Definite => | |
aa720a54 | 8119 | Rewrite (N, New_Occurrence_Of ( |
83496138 | 8120 | Boolean_Literals (Is_Definite_Subtype (P_Entity)), Loc)); |
aa720a54 | 8121 | Analyze_And_Resolve (N, Standard_Boolean); |
996ae0b0 | 8122 | |
a01b9df6 AC |
8123 | ----------- |
8124 | -- Delta -- | |
8125 | ----------- | |
8126 | ||
8127 | when Attribute_Delta => | |
8128 | Fold_Ureal (N, Delta_Value (P_Type), True); | |
8129 | ||
996ae0b0 RK |
8130 | ------------ |
8131 | -- Denorm -- | |
8132 | ------------ | |
8133 | ||
8134 | when Attribute_Denorm => | |
8135 | Fold_Uint | |
edab6088 | 8136 | (N, UI_From_Int (Boolean'Pos (Has_Denormals (P_Type))), Static); |
996ae0b0 | 8137 | |
203ddcea AC |
8138 | --------------------- |
8139 | -- Descriptor_Size -- | |
8140 | --------------------- | |
8141 | ||
8142 | when Attribute_Descriptor_Size => | |
8143 | null; | |
8144 | ||
996ae0b0 RK |
8145 | ------------ |
8146 | -- Digits -- | |
8147 | ------------ | |
8148 | ||
8149 | when Attribute_Digits => | |
edab6088 | 8150 | Fold_Uint (N, Digits_Value (P_Type), Static); |
996ae0b0 RK |
8151 | |
8152 | ---------- | |
8153 | -- Emax -- | |
8154 | ---------- | |
8155 | ||
8156 | when Attribute_Emax => | |
8157 | ||
8158 | -- Ada 83 attribute is defined as (RM83 3.5.8) | |
8159 | ||
8160 | -- T'Emax = 4 * T'Mantissa | |
8161 | ||
edab6088 | 8162 | Fold_Uint (N, 4 * Mantissa, Static); |
996ae0b0 RK |
8163 | |
8164 | -------------- | |
8165 | -- Enum_Rep -- | |
8166 | -------------- | |
8167 | ||
ca7e6c26 AC |
8168 | when Attribute_Enum_Rep => Enum_Rep : declare |
8169 | Val : Node_Id; | |
8170 | ||
8171 | begin | |
bed87f4f | 8172 | -- The attribute appears in the form: |
ca7e6c26 AC |
8173 | |
8174 | -- Enum_Typ'Enum_Rep (Const) | |
8175 | -- Enum_Typ'Enum_Rep (Enum_Lit) | |
8176 | ||
8177 | if Present (E1) then | |
8178 | Val := E1; | |
8179 | ||
bed87f4f | 8180 | -- Otherwise the prefix denotes a constant or enumeration literal: |
ca7e6c26 AC |
8181 | |
8182 | -- Const'Enum_Rep | |
8183 | -- Enum_Lit'Enum_Rep | |
8184 | ||
8185 | else | |
8186 | Val := P; | |
8187 | end if; | |
996ae0b0 | 8188 | |
82c80734 RD |
8189 | -- For an enumeration type with a non-standard representation use |
8190 | -- the Enumeration_Rep field of the proper constant. Note that this | |
8191 | -- will not work for types Character/Wide_[Wide-]Character, since no | |
8192 | -- real entities are created for the enumeration literals, but that | |
8193 | -- does not matter since these two types do not have non-standard | |
8194 | -- representations anyway. | |
996ae0b0 | 8195 | |
fbf5a39b AC |
8196 | if Is_Enumeration_Type (P_Type) |
8197 | and then Has_Non_Standard_Rep (P_Type) | |
8198 | then | |
ca7e6c26 | 8199 | Fold_Uint (N, Enumeration_Rep (Expr_Value_E (Val)), Static); |
996ae0b0 | 8200 | |
ca7e6c26 AC |
8201 | -- For enumeration types with standard representations and all other |
8202 | -- cases (i.e. all integer and modular types), Enum_Rep is equivalent | |
8203 | -- to Pos. | |
996ae0b0 | 8204 | |
fbf5a39b | 8205 | else |
ca7e6c26 | 8206 | Fold_Uint (N, Expr_Value (Val), Static); |
996ae0b0 | 8207 | end if; |
ca7e6c26 | 8208 | end Enum_Rep; |
996ae0b0 | 8209 | |
21d27997 RD |
8210 | -------------- |
8211 | -- Enum_Val -- | |
8212 | -------------- | |
8213 | ||
8214 | when Attribute_Enum_Val => Enum_Val : declare | |
8215 | Lit : Node_Id; | |
8216 | ||
8217 | begin | |
8218 | -- We have something like Enum_Type'Enum_Val (23), so search for a | |
8219 | -- corresponding value in the list of Enum_Rep values for the type. | |
8220 | ||
8221 | Lit := First_Literal (P_Base_Type); | |
8222 | loop | |
8223 | if Enumeration_Rep (Lit) = Expr_Value (E1) then | |
8224 | Fold_Uint (N, Enumeration_Pos (Lit), Static); | |
8225 | exit; | |
8226 | end if; | |
8227 | ||
8228 | Next_Literal (Lit); | |
8229 | ||
8230 | if No (Lit) then | |
8231 | Apply_Compile_Time_Constraint_Error | |
8232 | (N, "no representation value matches", | |
8233 | CE_Range_Check_Failed, | |
8234 | Warn => not Static); | |
8235 | exit; | |
8236 | end if; | |
8237 | end loop; | |
8238 | end Enum_Val; | |
8239 | ||
996ae0b0 RK |
8240 | ------------- |
8241 | -- Epsilon -- | |
8242 | ------------- | |
8243 | ||
8244 | when Attribute_Epsilon => | |
8245 | ||
8246 | -- Ada 83 attribute is defined as (RM83 3.5.8) | |
8247 | ||
8248 | -- T'Epsilon = 2.0**(1 - T'Mantissa) | |
8249 | ||
fbf5a39b | 8250 | Fold_Ureal (N, Ureal_2 ** (1 - Mantissa), True); |
996ae0b0 RK |
8251 | |
8252 | -------------- | |
8253 | -- Exponent -- | |
8254 | -------------- | |
8255 | ||
8256 | when Attribute_Exponent => | |
fbf5a39b | 8257 | Fold_Uint (N, |
7b55fea6 | 8258 | Eval_Fat.Exponent (P_Base_Type, Expr_Value_R (E1)), Static); |
996ae0b0 RK |
8259 | |
8260 | ----------- | |
8261 | -- First -- | |
8262 | ----------- | |
8263 | ||
8264 | when Attribute_First => First_Attr : | |
8265 | begin | |
8266 | Set_Bounds; | |
8267 | ||
8268 | if Compile_Time_Known_Value (Lo_Bound) then | |
8269 | if Is_Real_Type (P_Type) then | |
fbf5a39b | 8270 | Fold_Ureal (N, Expr_Value_R (Lo_Bound), Static); |
996ae0b0 | 8271 | else |
fbf5a39b | 8272 | Fold_Uint (N, Expr_Value (Lo_Bound), Static); |
996ae0b0 | 8273 | end if; |
6ca9ec9c | 8274 | |
5a153b27 AC |
8275 | else |
8276 | Check_Concurrent_Discriminant (Lo_Bound); | |
996ae0b0 RK |
8277 | end if; |
8278 | end First_Attr; | |
8279 | ||
011f9d5d AC |
8280 | ----------------- |
8281 | -- First_Valid -- | |
8282 | ----------------- | |
8283 | ||
8284 | when Attribute_First_Valid => First_Valid : | |
8285 | begin | |
8286 | if Has_Predicates (P_Type) | |
60f908dd | 8287 | and then Has_Static_Predicate (P_Type) |
011f9d5d AC |
8288 | then |
8289 | declare | |
60f908dd RD |
8290 | FirstN : constant Node_Id := |
8291 | First (Static_Discrete_Predicate (P_Type)); | |
011f9d5d AC |
8292 | begin |
8293 | if Nkind (FirstN) = N_Range then | |
8294 | Fold_Uint (N, Expr_Value (Low_Bound (FirstN)), Static); | |
8295 | else | |
8296 | Fold_Uint (N, Expr_Value (FirstN), Static); | |
8297 | end if; | |
8298 | end; | |
8299 | ||
8300 | else | |
8301 | Set_Bounds; | |
8302 | Fold_Uint (N, Expr_Value (Lo_Bound), Static); | |
8303 | end if; | |
8304 | end First_Valid; | |
8305 | ||
996ae0b0 RK |
8306 | ----------------- |
8307 | -- Fixed_Value -- | |
8308 | ----------------- | |
8309 | ||
8310 | when Attribute_Fixed_Value => | |
8311 | null; | |
8312 | ||
8313 | ----------- | |
8314 | -- Floor -- | |
8315 | ----------- | |
8316 | ||
8317 | when Attribute_Floor => | |
af31bd57 AC |
8318 | Fold_Ureal |
8319 | (N, Eval_Fat.Floor (P_Base_Type, Expr_Value_R (E1)), Static); | |
996ae0b0 RK |
8320 | |
8321 | ---------- | |
8322 | -- Fore -- | |
8323 | ---------- | |
8324 | ||
8325 | when Attribute_Fore => | |
fbf5a39b AC |
8326 | if Compile_Time_Known_Bounds (P_Type) then |
8327 | Fold_Uint (N, UI_From_Int (Fore_Value), Static); | |
996ae0b0 RK |
8328 | end if; |
8329 | ||
8330 | -------------- | |
8331 | -- Fraction -- | |
8332 | -------------- | |
8333 | ||
8334 | when Attribute_Fraction => | |
af31bd57 AC |
8335 | Fold_Ureal |
8336 | (N, Eval_Fat.Fraction (P_Base_Type, Expr_Value_R (E1)), Static); | |
996ae0b0 | 8337 | |
15ce9ca2 AC |
8338 | ----------------------- |
8339 | -- Has_Access_Values -- | |
8340 | ----------------------- | |
8341 | ||
8342 | when Attribute_Has_Access_Values => | |
8343 | Rewrite (N, New_Occurrence_Of | |
8344 | (Boolean_Literals (Has_Access_Values (P_Root_Type)), Loc)); | |
8345 | Analyze_And_Resolve (N, Standard_Boolean); | |
8346 | ||
996ae0b0 RK |
8347 | ----------------------- |
8348 | -- Has_Discriminants -- | |
8349 | ----------------------- | |
8350 | ||
8351 | when Attribute_Has_Discriminants => | |
aa720a54 AC |
8352 | Rewrite (N, New_Occurrence_Of ( |
8353 | Boolean_Literals (Has_Discriminants (P_Entity)), Loc)); | |
8354 | Analyze_And_Resolve (N, Standard_Boolean); | |
996ae0b0 | 8355 | |
ea70f3d0 RD |
8356 | ---------------------- |
8357 | -- Has_Same_Storage -- | |
8358 | ---------------------- | |
8359 | ||
8360 | when Attribute_Has_Same_Storage => | |
8361 | null; | |
8362 | ||
21d27997 RD |
8363 | ----------------------- |
8364 | -- Has_Tagged_Values -- | |
8365 | ----------------------- | |
8366 | ||
8367 | when Attribute_Has_Tagged_Values => | |
8368 | Rewrite (N, New_Occurrence_Of | |
8369 | (Boolean_Literals (Has_Tagged_Component (P_Root_Type)), Loc)); | |
8370 | Analyze_And_Resolve (N, Standard_Boolean); | |
8371 | ||
996ae0b0 RK |
8372 | -------------- |
8373 | -- Identity -- | |
8374 | -------------- | |
8375 | ||
8376 | when Attribute_Identity => | |
8377 | null; | |
8378 | ||
8379 | ----------- | |
8380 | -- Image -- | |
8381 | ----------- | |
8382 | ||
8383 | -- Image is a scalar attribute, but is never static, because it is | |
8384 | -- not a static function (having a non-scalar argument (RM 4.9(22)) | |
442ade9d RD |
8385 | -- However, we can constant-fold the image of an enumeration literal |
8386 | -- if names are available. | |
996ae0b0 RK |
8387 | |
8388 | when Attribute_Image => | |
442ade9d RD |
8389 | if Is_Entity_Name (E1) |
8390 | and then Ekind (Entity (E1)) = E_Enumeration_Literal | |
8391 | and then not Discard_Names (First_Subtype (Etype (E1))) | |
8392 | and then not Global_Discard_Names | |
8393 | then | |
8394 | declare | |
8395 | Lit : constant Entity_Id := Entity (E1); | |
8396 | Str : String_Id; | |
8397 | begin | |
8398 | Start_String; | |
8399 | Get_Unqualified_Decoded_Name_String (Chars (Lit)); | |
8400 | Set_Casing (All_Upper_Case); | |
8401 | Store_String_Chars (Name_Buffer (1 .. Name_Len)); | |
8402 | Str := End_String; | |
8403 | Rewrite (N, Make_String_Literal (Loc, Strval => Str)); | |
8404 | Analyze_And_Resolve (N, Standard_String); | |
8405 | Set_Is_Static_Expression (N, False); | |
8406 | end; | |
8407 | end if; | |
996ae0b0 | 8408 | |
996ae0b0 RK |
8409 | ------------------- |
8410 | -- Integer_Value -- | |
8411 | ------------------- | |
8412 | ||
21d27997 RD |
8413 | -- We never try to fold Integer_Value (though perhaps we could???) |
8414 | ||
996ae0b0 RK |
8415 | when Attribute_Integer_Value => |
8416 | null; | |
8417 | ||
21d27997 RD |
8418 | ------------------- |
8419 | -- Invalid_Value -- | |
8420 | ------------------- | |
8421 | ||
8422 | -- Invalid_Value is a scalar attribute that is never static, because | |
8423 | -- the value is by design out of range. | |
8424 | ||
8425 | when Attribute_Invalid_Value => | |
8426 | null; | |
8427 | ||
996ae0b0 RK |
8428 | ----------- |
8429 | -- Large -- | |
8430 | ----------- | |
8431 | ||
8432 | when Attribute_Large => | |
8433 | ||
8434 | -- For fixed-point, we use the identity: | |
8435 | ||
8436 | -- T'Large = (2.0**T'Mantissa - 1.0) * T'Small | |
8437 | ||
8438 | if Is_Fixed_Point_Type (P_Type) then | |
8439 | Rewrite (N, | |
8440 | Make_Op_Multiply (Loc, | |
8441 | Left_Opnd => | |
8442 | Make_Op_Subtract (Loc, | |
8443 | Left_Opnd => | |
8444 | Make_Op_Expon (Loc, | |
8445 | Left_Opnd => | |
8446 | Make_Real_Literal (Loc, Ureal_2), | |
8447 | Right_Opnd => | |
8448 | Make_Attribute_Reference (Loc, | |
8449 | Prefix => P, | |
8450 | Attribute_Name => Name_Mantissa)), | |
8451 | Right_Opnd => Make_Real_Literal (Loc, Ureal_1)), | |
8452 | ||
8453 | Right_Opnd => | |
8454 | Make_Real_Literal (Loc, Small_Value (Entity (P))))); | |
8455 | ||
8456 | Analyze_And_Resolve (N, C_Type); | |
8457 | ||
8458 | -- Floating-point (Ada 83 compatibility) | |
8459 | ||
8460 | else | |
8461 | -- Ada 83 attribute is defined as (RM83 3.5.8) | |
8462 | ||
8463 | -- T'Large = 2.0**T'Emax * (1.0 - 2.0**(-T'Mantissa)) | |
8464 | ||
8465 | -- where | |
8466 | ||
8467 | -- T'Emax = 4 * T'Mantissa | |
8468 | ||
af31bd57 AC |
8469 | Fold_Ureal |
8470 | (N, | |
8471 | Ureal_2 ** (4 * Mantissa) * (Ureal_1 - Ureal_2 ** (-Mantissa)), | |
8472 | True); | |
996ae0b0 RK |
8473 | end if; |
8474 | ||
2a290fec AC |
8475 | --------------- |
8476 | -- Lock_Free -- | |
8477 | --------------- | |
8478 | ||
0ebc109a VP |
8479 | when Attribute_Lock_Free => Lock_Free : declare |
8480 | V : constant Entity_Id := Boolean_Literals (Uses_Lock_Free (P_Type)); | |
2a290fec | 8481 | |
0ebc109a VP |
8482 | begin |
8483 | Rewrite (N, New_Occurrence_Of (V, Loc)); | |
8484 | ||
8485 | -- Analyze and resolve as boolean. Note that this attribute is a | |
8486 | -- static attribute in GNAT. | |
8487 | ||
8488 | Analyze_And_Resolve (N, Standard_Boolean); | |
edab6088 RD |
8489 | Static := True; |
8490 | Set_Is_Static_Expression (N, True); | |
0ebc109a | 8491 | end Lock_Free; |
2a290fec | 8492 | |
996ae0b0 RK |
8493 | ---------- |
8494 | -- Last -- | |
8495 | ---------- | |
8496 | ||
011f9d5d | 8497 | when Attribute_Last => Last_Attr : |
996ae0b0 RK |
8498 | begin |
8499 | Set_Bounds; | |
8500 | ||
8501 | if Compile_Time_Known_Value (Hi_Bound) then | |
8502 | if Is_Real_Type (P_Type) then | |
fbf5a39b | 8503 | Fold_Ureal (N, Expr_Value_R (Hi_Bound), Static); |
996ae0b0 | 8504 | else |
fbf5a39b | 8505 | Fold_Uint (N, Expr_Value (Hi_Bound), Static); |
996ae0b0 | 8506 | end if; |
6ca9ec9c | 8507 | |
5a153b27 AC |
8508 | else |
8509 | Check_Concurrent_Discriminant (Hi_Bound); | |
996ae0b0 | 8510 | end if; |
011f9d5d AC |
8511 | end Last_Attr; |
8512 | ||
8513 | ---------------- | |
8514 | -- Last_Valid -- | |
8515 | ---------------- | |
8516 | ||
8517 | when Attribute_Last_Valid => Last_Valid : | |
8518 | begin | |
8519 | if Has_Predicates (P_Type) | |
60f908dd | 8520 | and then Has_Static_Predicate (P_Type) |
011f9d5d AC |
8521 | then |
8522 | declare | |
60f908dd RD |
8523 | LastN : constant Node_Id := |
8524 | Last (Static_Discrete_Predicate (P_Type)); | |
011f9d5d AC |
8525 | begin |
8526 | if Nkind (LastN) = N_Range then | |
8527 | Fold_Uint (N, Expr_Value (High_Bound (LastN)), Static); | |
8528 | else | |
8529 | Fold_Uint (N, Expr_Value (LastN), Static); | |
8530 | end if; | |
8531 | end; | |
8532 | ||
8533 | else | |
8534 | Set_Bounds; | |
8535 | Fold_Uint (N, Expr_Value (Hi_Bound), Static); | |
8536 | end if; | |
8537 | end Last_Valid; | |
996ae0b0 RK |
8538 | |
8539 | ------------------ | |
8540 | -- Leading_Part -- | |
8541 | ------------------ | |
8542 | ||
8543 | when Attribute_Leading_Part => | |
af31bd57 AC |
8544 | Fold_Ureal |
8545 | (N, | |
8546 | Eval_Fat.Leading_Part | |
8547 | (P_Base_Type, Expr_Value_R (E1), Expr_Value (E2)), | |
8548 | Static); | |
996ae0b0 RK |
8549 | |
8550 | ------------ | |
8551 | -- Length -- | |
8552 | ------------ | |
8553 | ||
fbf5a39b AC |
8554 | when Attribute_Length => Length : declare |
8555 | Ind : Node_Id; | |
8556 | ||
996ae0b0 | 8557 | begin |
b4d7b435 AC |
8558 | -- If any index type is a formal type, or derived from one, the |
8559 | -- bounds are not static. Treating them as static can produce | |
8560 | -- spurious warnings or improper constant folding. | |
fbf5a39b AC |
8561 | |
8562 | Ind := First_Index (P_Type); | |
fbf5a39b | 8563 | while Present (Ind) loop |
b4d7b435 | 8564 | if Is_Generic_Type (Root_Type (Etype (Ind))) then |
fbf5a39b AC |
8565 | return; |
8566 | end if; | |
8567 | ||
8568 | Next_Index (Ind); | |
8569 | end loop; | |
8570 | ||
996ae0b0 RK |
8571 | Set_Bounds; |
8572 | ||
af02a866 RD |
8573 | -- For two compile time values, we can compute length |
8574 | ||
996ae0b0 RK |
8575 | if Compile_Time_Known_Value (Lo_Bound) |
8576 | and then Compile_Time_Known_Value (Hi_Bound) | |
8577 | then | |
8578 | Fold_Uint (N, | |
fbf5a39b | 8579 | UI_Max (0, 1 + (Expr_Value (Hi_Bound) - Expr_Value (Lo_Bound))), |
edab6088 | 8580 | Static); |
996ae0b0 | 8581 | end if; |
af02a866 RD |
8582 | |
8583 | -- One more case is where Hi_Bound and Lo_Bound are compile-time | |
8584 | -- comparable, and we can figure out the difference between them. | |
8585 | ||
8586 | declare | |
8587 | Diff : aliased Uint; | |
8588 | ||
8589 | begin | |
8590 | case | |
8591 | Compile_Time_Compare | |
8592 | (Lo_Bound, Hi_Bound, Diff'Access, Assume_Valid => False) | |
8593 | is | |
8594 | when EQ => | |
edab6088 | 8595 | Fold_Uint (N, Uint_1, Static); |
af02a866 RD |
8596 | |
8597 | when GT => | |
edab6088 | 8598 | Fold_Uint (N, Uint_0, Static); |
af02a866 RD |
8599 | |
8600 | when LT => | |
8601 | if Diff /= No_Uint then | |
edab6088 | 8602 | Fold_Uint (N, Diff + 1, Static); |
af02a866 RD |
8603 | end if; |
8604 | ||
8605 | when others => | |
8606 | null; | |
8607 | end case; | |
8608 | end; | |
996ae0b0 RK |
8609 | end Length; |
8610 | ||
150ac76e AC |
8611 | ---------------- |
8612 | -- Loop_Entry -- | |
8613 | ---------------- | |
8614 | ||
739e7bbf AC |
8615 | -- Loop_Entry acts as an alias of a constant initialized to the prefix |
8616 | -- of the said attribute at the point of entry into the related loop. As | |
8617 | -- such, the attribute reference does not need to be evaluated because | |
8618 | -- the prefix is the one that is evaluted. | |
97ce3a14 | 8619 | |
150ac76e AC |
8620 | when Attribute_Loop_Entry => |
8621 | null; | |
8622 | ||
996ae0b0 RK |
8623 | ------------- |
8624 | -- Machine -- | |
8625 | ------------- | |
8626 | ||
8627 | when Attribute_Machine => | |
af31bd57 AC |
8628 | Fold_Ureal |
8629 | (N, | |
8630 | Eval_Fat.Machine | |
8631 | (P_Base_Type, Expr_Value_R (E1), Eval_Fat.Round, N), | |
8632 | Static); | |
996ae0b0 RK |
8633 | |
8634 | ------------------ | |
8635 | -- Machine_Emax -- | |
8636 | ------------------ | |
8637 | ||
8638 | when Attribute_Machine_Emax => | |
d32e3cee | 8639 | Fold_Uint (N, Machine_Emax_Value (P_Type), Static); |
996ae0b0 RK |
8640 | |
8641 | ------------------ | |
8642 | -- Machine_Emin -- | |
8643 | ------------------ | |
8644 | ||
8645 | when Attribute_Machine_Emin => | |
d32e3cee | 8646 | Fold_Uint (N, Machine_Emin_Value (P_Type), Static); |
996ae0b0 RK |
8647 | |
8648 | ---------------------- | |
8649 | -- Machine_Mantissa -- | |
8650 | ---------------------- | |
8651 | ||
8652 | when Attribute_Machine_Mantissa => | |
d32e3cee | 8653 | Fold_Uint (N, Machine_Mantissa_Value (P_Type), Static); |
996ae0b0 RK |
8654 | |
8655 | ----------------------- | |
8656 | -- Machine_Overflows -- | |
8657 | ----------------------- | |
8658 | ||
8659 | when Attribute_Machine_Overflows => | |
8660 | ||
8661 | -- Always true for fixed-point | |
8662 | ||
8663 | if Is_Fixed_Point_Type (P_Type) then | |
edab6088 | 8664 | Fold_Uint (N, True_Value, Static); |
996ae0b0 RK |
8665 | |
8666 | -- Floating point case | |
8667 | ||
8668 | else | |
fbf5a39b AC |
8669 | Fold_Uint (N, |
8670 | UI_From_Int (Boolean'Pos (Machine_Overflows_On_Target)), | |
edab6088 | 8671 | Static); |
996ae0b0 RK |
8672 | end if; |
8673 | ||
8674 | ------------------- | |
8675 | -- Machine_Radix -- | |
8676 | ------------------- | |
8677 | ||
8678 | when Attribute_Machine_Radix => | |
8679 | if Is_Fixed_Point_Type (P_Type) then | |
8680 | if Is_Decimal_Fixed_Point_Type (P_Type) | |
8681 | and then Machine_Radix_10 (P_Type) | |
8682 | then | |
edab6088 | 8683 | Fold_Uint (N, Uint_10, Static); |
996ae0b0 | 8684 | else |
edab6088 | 8685 | Fold_Uint (N, Uint_2, Static); |
996ae0b0 RK |
8686 | end if; |
8687 | ||
8688 | -- All floating-point type always have radix 2 | |
8689 | ||
8690 | else | |
edab6088 | 8691 | Fold_Uint (N, Uint_2, Static); |
996ae0b0 RK |
8692 | end if; |
8693 | ||
65f01153 RD |
8694 | ---------------------- |
8695 | -- Machine_Rounding -- | |
8696 | ---------------------- | |
8697 | ||
8698 | -- Note: for the folding case, it is fine to treat Machine_Rounding | |
8699 | -- exactly the same way as Rounding, since this is one of the allowed | |
8700 | -- behaviors, and performance is not an issue here. It might be a bit | |
e7c0dd39 | 8701 | -- better to give the same result as it would give at run time, even |
65f01153 RD |
8702 | -- though the non-determinism is certainly permitted. |
8703 | ||
8704 | when Attribute_Machine_Rounding => | |
af31bd57 AC |
8705 | Fold_Ureal |
8706 | (N, Eval_Fat.Rounding (P_Base_Type, Expr_Value_R (E1)), Static); | |
65f01153 | 8707 | |
996ae0b0 RK |
8708 | -------------------- |
8709 | -- Machine_Rounds -- | |
8710 | -------------------- | |
8711 | ||
8712 | when Attribute_Machine_Rounds => | |
8713 | ||
8714 | -- Always False for fixed-point | |
8715 | ||
8716 | if Is_Fixed_Point_Type (P_Type) then | |
edab6088 | 8717 | Fold_Uint (N, False_Value, Static); |
996ae0b0 RK |
8718 | |
8719 | -- Else yield proper floating-point result | |
8720 | ||
8721 | else | |
8722 | Fold_Uint | |
edab6088 RD |
8723 | (N, UI_From_Int (Boolean'Pos (Machine_Rounds_On_Target)), |
8724 | Static); | |
996ae0b0 RK |
8725 | end if; |
8726 | ||
8727 | ------------------ | |
8728 | -- Machine_Size -- | |
8729 | ------------------ | |
8730 | ||
8731 | -- Note: Machine_Size is identical to Object_Size | |
8732 | ||
8733 | when Attribute_Machine_Size => Machine_Size : declare | |
8734 | P_TypeA : constant Entity_Id := Underlying_Type (P_Type); | |
8735 | ||
8736 | begin | |
8737 | if Known_Esize (P_TypeA) then | |
edab6088 | 8738 | Fold_Uint (N, Esize (P_TypeA), Static); |
996ae0b0 RK |
8739 | end if; |
8740 | end Machine_Size; | |
8741 | ||
8742 | -------------- | |
8743 | -- Mantissa -- | |
8744 | -------------- | |
8745 | ||
8746 | when Attribute_Mantissa => | |
8747 | ||
8748 | -- Fixed-point mantissa | |
8749 | ||
8750 | if Is_Fixed_Point_Type (P_Type) then | |
8751 | ||
8752 | -- Compile time foldable case | |
8753 | ||
8754 | if Compile_Time_Known_Value (Type_Low_Bound (P_Type)) | |
8755 | and then | |
8756 | Compile_Time_Known_Value (Type_High_Bound (P_Type)) | |
8757 | then | |
8758 | -- The calculation of the obsolete Ada 83 attribute Mantissa | |
8759 | -- is annoying, because of AI00143, quoted here: | |
8760 | ||
8761 | -- !question 84-01-10 | |
8762 | ||
8763 | -- Consider the model numbers for F: | |
8764 | ||
8765 | -- type F is delta 1.0 range -7.0 .. 8.0; | |
8766 | ||
8767 | -- The wording requires that F'MANTISSA be the SMALLEST | |
8768 | -- integer number for which each bound of the specified | |
8769 | -- range is either a model number or lies at most small | |
8770 | -- distant from a model number. This means F'MANTISSA | |
8771 | -- is required to be 3 since the range -7.0 .. 7.0 fits | |
8772 | -- in 3 signed bits, and 8 is "at most" 1.0 from a model | |
8773 | -- number, namely, 7. Is this analysis correct? Note that | |
8774 | -- this implies the upper bound of the range is not | |
8775 | -- represented as a model number. | |
8776 | ||
8777 | -- !response 84-03-17 | |
8778 | ||
8779 | -- The analysis is correct. The upper and lower bounds for | |
8780 | -- a fixed point type can lie outside the range of model | |
8781 | -- numbers. | |
8782 | ||
8783 | declare | |
8784 | Siz : Uint; | |
8785 | LBound : Ureal; | |
8786 | UBound : Ureal; | |
8787 | Bound : Ureal; | |
8788 | Max_Man : Uint; | |
8789 | ||
8790 | begin | |
8791 | LBound := Expr_Value_R (Type_Low_Bound (P_Type)); | |
8792 | UBound := Expr_Value_R (Type_High_Bound (P_Type)); | |
8793 | Bound := UR_Max (UR_Abs (LBound), UR_Abs (UBound)); | |
8794 | Max_Man := UR_Trunc (Bound / Small_Value (P_Type)); | |
8795 | ||
8796 | -- If the Bound is exactly a model number, i.e. a multiple | |
8797 | -- of Small, then we back it off by one to get the integer | |
8798 | -- value that must be representable. | |
8799 | ||
8800 | if Small_Value (P_Type) * Max_Man = Bound then | |
8801 | Max_Man := Max_Man - 1; | |
8802 | end if; | |
8803 | ||
8804 | -- Now find corresponding size = Mantissa value | |
8805 | ||
8806 | Siz := Uint_0; | |
8807 | while 2 ** Siz < Max_Man loop | |
8808 | Siz := Siz + 1; | |
8809 | end loop; | |
8810 | ||
edab6088 | 8811 | Fold_Uint (N, Siz, Static); |
996ae0b0 RK |
8812 | end; |
8813 | ||
8814 | else | |
8815 | -- The case of dynamic bounds cannot be evaluated at compile | |
8816 | -- time. Instead we use a runtime routine (see Exp_Attr). | |
8817 | ||
8818 | null; | |
8819 | end if; | |
8820 | ||
8821 | -- Floating-point Mantissa | |
8822 | ||
8823 | else | |
edab6088 | 8824 | Fold_Uint (N, Mantissa, Static); |
996ae0b0 RK |
8825 | end if; |
8826 | ||
8827 | --------- | |
8828 | -- Max -- | |
8829 | --------- | |
8830 | ||
8831 | when Attribute_Max => Max : | |
8832 | begin | |
8833 | if Is_Real_Type (P_Type) then | |
fbf5a39b AC |
8834 | Fold_Ureal |
8835 | (N, UR_Max (Expr_Value_R (E1), Expr_Value_R (E2)), Static); | |
996ae0b0 | 8836 | else |
fbf5a39b | 8837 | Fold_Uint (N, UI_Max (Expr_Value (E1), Expr_Value (E2)), Static); |
996ae0b0 RK |
8838 | end if; |
8839 | end Max; | |
8840 | ||
4adf3c50 AC |
8841 | ---------------------------------- |
8842 | -- Max_Alignment_For_Allocation -- | |
8843 | ---------------------------------- | |
8844 | ||
8845 | -- Max_Alignment_For_Allocation is usually the Alignment. However, | |
8846 | -- arrays are allocated with dope, so we need to take into account both | |
8847 | -- the alignment of the array, which comes from the component alignment, | |
8848 | -- and the alignment of the dope. Also, if the alignment is unknown, we | |
8849 | -- use the max (it's OK to be pessimistic). | |
8850 | ||
8851 | when Attribute_Max_Alignment_For_Allocation => | |
8852 | declare | |
8853 | A : Uint := UI_From_Int (Ttypes.Maximum_Alignment); | |
8854 | begin | |
8855 | if Known_Alignment (P_Type) and then | |
8856 | (not Is_Array_Type (P_Type) or else Alignment (P_Type) > A) | |
8857 | then | |
8858 | A := Alignment (P_Type); | |
8859 | end if; | |
8860 | ||
8861 | Fold_Uint (N, A, Static); | |
8862 | end; | |
8863 | ||
996ae0b0 RK |
8864 | ---------------------------------- |
8865 | -- Max_Size_In_Storage_Elements -- | |
8866 | ---------------------------------- | |
8867 | ||
8868 | -- Max_Size_In_Storage_Elements is simply the Size rounded up to a | |
8869 | -- Storage_Unit boundary. We can fold any cases for which the size | |
8870 | -- is known by the front end. | |
8871 | ||
8872 | when Attribute_Max_Size_In_Storage_Elements => | |
8873 | if Known_Esize (P_Type) then | |
8874 | Fold_Uint (N, | |
8875 | (Esize (P_Type) + System_Storage_Unit - 1) / | |
fbf5a39b AC |
8876 | System_Storage_Unit, |
8877 | Static); | |
996ae0b0 RK |
8878 | end if; |
8879 | ||
8880 | -------------------- | |
8881 | -- Mechanism_Code -- | |
8882 | -------------------- | |
8883 | ||
8884 | when Attribute_Mechanism_Code => | |
8885 | declare | |
8886 | Val : Int; | |
8887 | Formal : Entity_Id; | |
8888 | Mech : Mechanism_Type; | |
8889 | ||
8890 | begin | |
8891 | if No (E1) then | |
8892 | Mech := Mechanism (P_Entity); | |
8893 | ||
8894 | else | |
8895 | Val := UI_To_Int (Expr_Value (E1)); | |
8896 | ||
8897 | Formal := First_Formal (P_Entity); | |
8898 | for J in 1 .. Val - 1 loop | |
8899 | Next_Formal (Formal); | |
8900 | end loop; | |
8901 | Mech := Mechanism (Formal); | |
8902 | end if; | |
8903 | ||
8904 | if Mech < 0 then | |
edab6088 | 8905 | Fold_Uint (N, UI_From_Int (Int (-Mech)), Static); |
996ae0b0 RK |
8906 | end if; |
8907 | end; | |
8908 | ||
8909 | --------- | |
8910 | -- Min -- | |
8911 | --------- | |
8912 | ||
8913 | when Attribute_Min => Min : | |
8914 | begin | |
8915 | if Is_Real_Type (P_Type) then | |
fbf5a39b AC |
8916 | Fold_Ureal |
8917 | (N, UR_Min (Expr_Value_R (E1), Expr_Value_R (E2)), Static); | |
996ae0b0 | 8918 | else |
5f3ab6fb AC |
8919 | Fold_Uint |
8920 | (N, UI_Min (Expr_Value (E1), Expr_Value (E2)), Static); | |
996ae0b0 RK |
8921 | end if; |
8922 | end Min; | |
8923 | ||
5f3ab6fb AC |
8924 | --------- |
8925 | -- Mod -- | |
8926 | --------- | |
8927 | ||
8928 | when Attribute_Mod => | |
8929 | Fold_Uint | |
8930 | (N, UI_Mod (Expr_Value (E1), Modulus (P_Base_Type)), Static); | |
8931 | ||
996ae0b0 RK |
8932 | ----------- |
8933 | -- Model -- | |
8934 | ----------- | |
8935 | ||
8936 | when Attribute_Model => | |
af31bd57 AC |
8937 | Fold_Ureal |
8938 | (N, Eval_Fat.Model (P_Base_Type, Expr_Value_R (E1)), Static); | |
996ae0b0 RK |
8939 | |
8940 | ---------------- | |
8941 | -- Model_Emin -- | |
8942 | ---------------- | |
8943 | ||
8944 | when Attribute_Model_Emin => | |
d32e3cee | 8945 | Fold_Uint (N, Model_Emin_Value (P_Base_Type), Static); |
996ae0b0 RK |
8946 | |
8947 | ------------------- | |
8948 | -- Model_Epsilon -- | |
8949 | ------------------- | |
8950 | ||
8951 | when Attribute_Model_Epsilon => | |
d32e3cee | 8952 | Fold_Ureal (N, Model_Epsilon_Value (P_Base_Type), Static); |
996ae0b0 RK |
8953 | |
8954 | -------------------- | |
8955 | -- Model_Mantissa -- | |
8956 | -------------------- | |
8957 | ||
8958 | when Attribute_Model_Mantissa => | |
d32e3cee | 8959 | Fold_Uint (N, Model_Mantissa_Value (P_Base_Type), Static); |
996ae0b0 RK |
8960 | |
8961 | ----------------- | |
8962 | -- Model_Small -- | |
8963 | ----------------- | |
8964 | ||
8965 | when Attribute_Model_Small => | |
d32e3cee | 8966 | Fold_Ureal (N, Model_Small_Value (P_Base_Type), Static); |
996ae0b0 RK |
8967 | |
8968 | ------------- | |
8969 | -- Modulus -- | |
8970 | ------------- | |
8971 | ||
8972 | when Attribute_Modulus => | |
edab6088 | 8973 | Fold_Uint (N, Modulus (P_Type), Static); |
996ae0b0 RK |
8974 | |
8975 | -------------------- | |
8976 | -- Null_Parameter -- | |
8977 | -------------------- | |
8978 | ||
8979 | -- Cannot fold, we know the value sort of, but the whole point is | |
8980 | -- that there is no way to talk about this imaginary value except | |
8981 | -- by using the attribute, so we leave it the way it is. | |
8982 | ||
8983 | when Attribute_Null_Parameter => | |
8984 | null; | |
8985 | ||
8986 | ----------------- | |
8987 | -- Object_Size -- | |
8988 | ----------------- | |
8989 | ||
8990 | -- The Object_Size attribute for a type returns the Esize of the | |
8991 | -- type and can be folded if this value is known. | |
8992 | ||
8993 | when Attribute_Object_Size => Object_Size : declare | |
8994 | P_TypeA : constant Entity_Id := Underlying_Type (P_Type); | |
8995 | ||
8996 | begin | |
8997 | if Known_Esize (P_TypeA) then | |
edab6088 | 8998 | Fold_Uint (N, Esize (P_TypeA), Static); |
996ae0b0 RK |
8999 | end if; |
9000 | end Object_Size; | |
9001 | ||
2d42e881 ES |
9002 | ---------------------- |
9003 | -- Overlaps_Storage -- | |
9004 | ---------------------- | |
9005 | ||
9006 | when Attribute_Overlaps_Storage => | |
9007 | null; | |
9008 | ||
996ae0b0 RK |
9009 | ------------------------- |
9010 | -- Passed_By_Reference -- | |
9011 | ------------------------- | |
9012 | ||
9013 | -- Scalar types are never passed by reference | |
9014 | ||
9015 | when Attribute_Passed_By_Reference => | |
edab6088 | 9016 | Fold_Uint (N, False_Value, Static); |
996ae0b0 RK |
9017 | |
9018 | --------- | |
9019 | -- Pos -- | |
9020 | --------- | |
9021 | ||
9022 | when Attribute_Pos => | |
edab6088 | 9023 | Fold_Uint (N, Expr_Value (E1), Static); |
996ae0b0 RK |
9024 | |
9025 | ---------- | |
9026 | -- Pred -- | |
9027 | ---------- | |
9028 | ||
9029 | when Attribute_Pred => Pred : | |
9030 | begin | |
fbf5a39b | 9031 | -- Floating-point case |
996ae0b0 | 9032 | |
fbf5a39b | 9033 | if Is_Floating_Point_Type (P_Type) then |
af31bd57 AC |
9034 | Fold_Ureal |
9035 | (N, Eval_Fat.Pred (P_Base_Type, Expr_Value_R (E1)), Static); | |
996ae0b0 | 9036 | |
fbf5a39b | 9037 | -- Fixed-point case |
996ae0b0 | 9038 | |
fbf5a39b | 9039 | elsif Is_Fixed_Point_Type (P_Type) then |
af31bd57 AC |
9040 | Fold_Ureal |
9041 | (N, Expr_Value_R (E1) - Small_Value (P_Type), True); | |
996ae0b0 | 9042 | |
fbf5a39b | 9043 | -- Modular integer case (wraps) |
996ae0b0 | 9044 | |
fbf5a39b AC |
9045 | elsif Is_Modular_Integer_Type (P_Type) then |
9046 | Fold_Uint (N, (Expr_Value (E1) - 1) mod Modulus (P_Type), Static); | |
996ae0b0 | 9047 | |
fbf5a39b | 9048 | -- Other scalar cases |
996ae0b0 | 9049 | |
fbf5a39b AC |
9050 | else |
9051 | pragma Assert (Is_Scalar_Type (P_Type)); | |
996ae0b0 | 9052 | |
fbf5a39b AC |
9053 | if Is_Enumeration_Type (P_Type) |
9054 | and then Expr_Value (E1) = | |
9055 | Expr_Value (Type_Low_Bound (P_Base_Type)) | |
9056 | then | |
9057 | Apply_Compile_Time_Constraint_Error | |
9058 | (N, "Pred of `&''First`", | |
9059 | CE_Overflow_Check_Failed, | |
9060 | Ent => P_Base_Type, | |
9061 | Warn => not Static); | |
996ae0b0 | 9062 | |
fbf5a39b AC |
9063 | Check_Expressions; |
9064 | return; | |
996ae0b0 | 9065 | end if; |
fbf5a39b AC |
9066 | |
9067 | Fold_Uint (N, Expr_Value (E1) - 1, Static); | |
996ae0b0 RK |
9068 | end if; |
9069 | end Pred; | |
9070 | ||
9071 | ----------- | |
9072 | -- Range -- | |
9073 | ----------- | |
9074 | ||
9075 | -- No processing required, because by this stage, Range has been | |
9076 | -- replaced by First .. Last, so this branch can never be taken. | |
9077 | ||
9078 | when Attribute_Range => | |
9079 | raise Program_Error; | |
9080 | ||
9081 | ------------------ | |
9082 | -- Range_Length -- | |
9083 | ------------------ | |
9084 | ||
9085 | when Attribute_Range_Length => | |
9086 | Set_Bounds; | |
9087 | ||
af02a866 RD |
9088 | -- Can fold if both bounds are compile time known |
9089 | ||
996ae0b0 RK |
9090 | if Compile_Time_Known_Value (Hi_Bound) |
9091 | and then Compile_Time_Known_Value (Lo_Bound) | |
9092 | then | |
9093 | Fold_Uint (N, | |
9094 | UI_Max | |
fbf5a39b AC |
9095 | (0, Expr_Value (Hi_Bound) - Expr_Value (Lo_Bound) + 1), |
9096 | Static); | |
996ae0b0 RK |
9097 | end if; |
9098 | ||
af02a866 RD |
9099 | -- One more case is where Hi_Bound and Lo_Bound are compile-time |
9100 | -- comparable, and we can figure out the difference between them. | |
9101 | ||
9102 | declare | |
9103 | Diff : aliased Uint; | |
9104 | ||
9105 | begin | |
9106 | case | |
9107 | Compile_Time_Compare | |
9108 | (Lo_Bound, Hi_Bound, Diff'Access, Assume_Valid => False) | |
9109 | is | |
9110 | when EQ => | |
edab6088 | 9111 | Fold_Uint (N, Uint_1, Static); |
af02a866 RD |
9112 | |
9113 | when GT => | |
edab6088 | 9114 | Fold_Uint (N, Uint_0, Static); |
af02a866 RD |
9115 | |
9116 | when LT => | |
9117 | if Diff /= No_Uint then | |
edab6088 | 9118 | Fold_Uint (N, Diff + 1, Static); |
af02a866 RD |
9119 | end if; |
9120 | ||
9121 | when others => | |
9122 | null; | |
9123 | end case; | |
9124 | end; | |
9125 | ||
46202729 AC |
9126 | --------- |
9127 | -- Ref -- | |
9128 | --------- | |
9129 | ||
9130 | when Attribute_Ref => | |
edab6088 | 9131 | Fold_Uint (N, Expr_Value (E1), Static); |
46202729 | 9132 | |
996ae0b0 RK |
9133 | --------------- |
9134 | -- Remainder -- | |
9135 | --------------- | |
9136 | ||
82c80734 RD |
9137 | when Attribute_Remainder => Remainder : declare |
9138 | X : constant Ureal := Expr_Value_R (E1); | |
9139 | Y : constant Ureal := Expr_Value_R (E2); | |
9140 | ||
9141 | begin | |
9142 | if UR_Is_Zero (Y) then | |
9143 | Apply_Compile_Time_Constraint_Error | |
9144 | (N, "division by zero in Remainder", | |
9145 | CE_Overflow_Check_Failed, | |
9146 | Warn => not Static); | |
9147 | ||
9148 | Check_Expressions; | |
9149 | return; | |
9150 | end if; | |
9151 | ||
7b55fea6 | 9152 | Fold_Ureal (N, Eval_Fat.Remainder (P_Base_Type, X, Y), Static); |
82c80734 | 9153 | end Remainder; |
996ae0b0 | 9154 | |
2cbac6c6 AC |
9155 | ----------------- |
9156 | -- Restriction -- | |
9157 | ----------------- | |
9158 | ||
9159 | when Attribute_Restriction_Set => Restriction_Set : declare | |
9160 | begin | |
9161 | Rewrite (N, New_Occurrence_Of (Standard_False, Loc)); | |
9162 | Set_Is_Static_Expression (N); | |
9163 | end Restriction_Set; | |
9164 | ||
996ae0b0 RK |
9165 | ----------- |
9166 | -- Round -- | |
9167 | ----------- | |
9168 | ||
9169 | when Attribute_Round => Round : | |
9170 | declare | |
9171 | Sr : Ureal; | |
9172 | Si : Uint; | |
9173 | ||
9174 | begin | |
fbf5a39b | 9175 | -- First we get the (exact result) in units of small |
996ae0b0 | 9176 | |
fbf5a39b | 9177 | Sr := Expr_Value_R (E1) / Small_Value (C_Type); |
996ae0b0 | 9178 | |
fbf5a39b | 9179 | -- Now round that exactly to an integer |
996ae0b0 | 9180 | |
fbf5a39b | 9181 | Si := UR_To_Uint (Sr); |
996ae0b0 | 9182 | |
fbf5a39b | 9183 | -- Finally the result is obtained by converting back to real |
996ae0b0 | 9184 | |
fbf5a39b | 9185 | Fold_Ureal (N, Si * Small_Value (C_Type), Static); |
996ae0b0 RK |
9186 | end Round; |
9187 | ||
9188 | -------------- | |
9189 | -- Rounding -- | |
9190 | -------------- | |
9191 | ||
9192 | when Attribute_Rounding => | |
af31bd57 AC |
9193 | Fold_Ureal |
9194 | (N, Eval_Fat.Rounding (P_Base_Type, Expr_Value_R (E1)), Static); | |
996ae0b0 RK |
9195 | |
9196 | --------------- | |
9197 | -- Safe_Emax -- | |
9198 | --------------- | |
9199 | ||
9200 | when Attribute_Safe_Emax => | |
d32e3cee | 9201 | Fold_Uint (N, Safe_Emax_Value (P_Type), Static); |
996ae0b0 RK |
9202 | |
9203 | ---------------- | |
9204 | -- Safe_First -- | |
9205 | ---------------- | |
9206 | ||
9207 | when Attribute_Safe_First => | |
d32e3cee | 9208 | Fold_Ureal (N, Safe_First_Value (P_Type), Static); |
996ae0b0 RK |
9209 | |
9210 | ---------------- | |
9211 | -- Safe_Large -- | |
9212 | ---------------- | |
9213 | ||
9214 | when Attribute_Safe_Large => | |
9215 | if Is_Fixed_Point_Type (P_Type) then | |
fbf5a39b AC |
9216 | Fold_Ureal |
9217 | (N, Expr_Value_R (Type_High_Bound (P_Base_Type)), Static); | |
996ae0b0 | 9218 | else |
d32e3cee | 9219 | Fold_Ureal (N, Safe_Last_Value (P_Type), Static); |
996ae0b0 RK |
9220 | end if; |
9221 | ||
9222 | --------------- | |
9223 | -- Safe_Last -- | |
9224 | --------------- | |
9225 | ||
9226 | when Attribute_Safe_Last => | |
d32e3cee | 9227 | Fold_Ureal (N, Safe_Last_Value (P_Type), Static); |
996ae0b0 RK |
9228 | |
9229 | ---------------- | |
9230 | -- Safe_Small -- | |
9231 | ---------------- | |
9232 | ||
9233 | when Attribute_Safe_Small => | |
9234 | ||
9235 | -- In Ada 95, the old Ada 83 attribute Safe_Small is redundant | |
9236 | -- for fixed-point, since is the same as Small, but we implement | |
9237 | -- it for backwards compatibility. | |
9238 | ||
9239 | if Is_Fixed_Point_Type (P_Type) then | |
fbf5a39b | 9240 | Fold_Ureal (N, Small_Value (P_Type), Static); |
996ae0b0 RK |
9241 | |
9242 | -- Ada 83 Safe_Small for floating-point cases | |
9243 | ||
9244 | else | |
d32e3cee | 9245 | Fold_Ureal (N, Model_Small_Value (P_Type), Static); |
996ae0b0 RK |
9246 | end if; |
9247 | ||
9248 | ----------- | |
9249 | -- Scale -- | |
9250 | ----------- | |
9251 | ||
9252 | when Attribute_Scale => | |
edab6088 | 9253 | Fold_Uint (N, Scale_Value (P_Type), Static); |
996ae0b0 RK |
9254 | |
9255 | ------------- | |
9256 | -- Scaling -- | |
9257 | ------------- | |
9258 | ||
9259 | when Attribute_Scaling => | |
af31bd57 AC |
9260 | Fold_Ureal |
9261 | (N, | |
9262 | Eval_Fat.Scaling | |
9263 | (P_Base_Type, Expr_Value_R (E1), Expr_Value (E2)), | |
9264 | Static); | |
996ae0b0 RK |
9265 | |
9266 | ------------------ | |
9267 | -- Signed_Zeros -- | |
9268 | ------------------ | |
9269 | ||
9270 | when Attribute_Signed_Zeros => | |
9271 | Fold_Uint | |
b887f1a0 | 9272 | (N, UI_From_Int (Boolean'Pos (Has_Signed_Zeros (P_Type))), Static); |
996ae0b0 RK |
9273 | |
9274 | ---------- | |
9275 | -- Size -- | |
9276 | ---------- | |
9277 | ||
9278 | -- Size attribute returns the RM size. All scalar types can be folded, | |
9279 | -- as well as any types for which the size is known by the front end, | |
edab6088 RD |
9280 | -- including any type for which a size attribute is specified. This is |
9281 | -- one of the places where it is annoying that a size of zero means two | |
9282 | -- things (zero size for scalars, unspecified size for non-scalars). | |
996ae0b0 RK |
9283 | |
9284 | when Attribute_Size | Attribute_VADS_Size => Size : declare | |
9285 | P_TypeA : constant Entity_Id := Underlying_Type (P_Type); | |
9286 | ||
9287 | begin | |
edab6088 | 9288 | if Is_Scalar_Type (P_TypeA) or else RM_Size (P_TypeA) /= Uint_0 then |
996ae0b0 RK |
9289 | |
9290 | -- VADS_Size case | |
9291 | ||
fbf5a39b | 9292 | if Id = Attribute_VADS_Size or else Use_VADS_Size then |
996ae0b0 RK |
9293 | declare |
9294 | S : constant Node_Id := Size_Clause (P_TypeA); | |
9295 | ||
9296 | begin | |
9297 | -- If a size clause applies, then use the size from it. | |
9298 | -- This is one of the rare cases where we can use the | |
9299 | -- Size_Clause field for a subtype when Has_Size_Clause | |
9300 | -- is False. Consider: | |
9301 | ||
82c80734 | 9302 | -- type x is range 1 .. 64; |
996ae0b0 RK |
9303 | -- for x'size use 12; |
9304 | -- subtype y is x range 0 .. 3; | |
9305 | ||
9306 | -- Here y has a size clause inherited from x, but normally | |
9307 | -- it does not apply, and y'size is 2. However, y'VADS_Size | |
9308 | -- is indeed 12 and not 2. | |
9309 | ||
9310 | if Present (S) | |
9311 | and then Is_OK_Static_Expression (Expression (S)) | |
9312 | then | |
edab6088 | 9313 | Fold_Uint (N, Expr_Value (Expression (S)), Static); |
996ae0b0 RK |
9314 | |
9315 | -- If no size is specified, then we simply use the object | |
9316 | -- size in the VADS_Size case (e.g. Natural'Size is equal | |
9317 | -- to Integer'Size, not one less). | |
9318 | ||
9319 | else | |
edab6088 | 9320 | Fold_Uint (N, Esize (P_TypeA), Static); |
996ae0b0 RK |
9321 | end if; |
9322 | end; | |
9323 | ||
9324 | -- Normal case (Size) in which case we want the RM_Size | |
9325 | ||
9326 | else | |
edab6088 | 9327 | Fold_Uint (N, RM_Size (P_TypeA), Static); |
996ae0b0 RK |
9328 | end if; |
9329 | end if; | |
9330 | end Size; | |
9331 | ||
9332 | ----------- | |
9333 | -- Small -- | |
9334 | ----------- | |
9335 | ||
9336 | when Attribute_Small => | |
9337 | ||
12a13f01 | 9338 | -- The floating-point case is present only for Ada 83 compatibility. |
996ae0b0 RK |
9339 | -- Note that strictly this is an illegal addition, since we are |
9340 | -- extending an Ada 95 defined attribute, but we anticipate an | |
9341 | -- ARG ruling that will permit this. | |
9342 | ||
9343 | if Is_Floating_Point_Type (P_Type) then | |
9344 | ||
9345 | -- Ada 83 attribute is defined as (RM83 3.5.8) | |
9346 | ||
9347 | -- T'Small = 2.0**(-T'Emax - 1) | |
9348 | ||
9349 | -- where | |
9350 | ||
9351 | -- T'Emax = 4 * T'Mantissa | |
9352 | ||
fbf5a39b | 9353 | Fold_Ureal (N, Ureal_2 ** ((-(4 * Mantissa)) - 1), Static); |
996ae0b0 RK |
9354 | |
9355 | -- Normal Ada 95 fixed-point case | |
9356 | ||
9357 | else | |
fbf5a39b | 9358 | Fold_Ureal (N, Small_Value (P_Type), True); |
996ae0b0 RK |
9359 | end if; |
9360 | ||
82c80734 RD |
9361 | ----------------- |
9362 | -- Stream_Size -- | |
9363 | ----------------- | |
9364 | ||
9365 | when Attribute_Stream_Size => | |
9366 | null; | |
9367 | ||
996ae0b0 RK |
9368 | ---------- |
9369 | -- Succ -- | |
9370 | ---------- | |
9371 | ||
9372 | when Attribute_Succ => Succ : | |
9373 | begin | |
fbf5a39b | 9374 | -- Floating-point case |
996ae0b0 | 9375 | |
fbf5a39b | 9376 | if Is_Floating_Point_Type (P_Type) then |
af31bd57 AC |
9377 | Fold_Ureal |
9378 | (N, Eval_Fat.Succ (P_Base_Type, Expr_Value_R (E1)), Static); | |
996ae0b0 | 9379 | |
fbf5a39b | 9380 | -- Fixed-point case |
996ae0b0 | 9381 | |
fbf5a39b | 9382 | elsif Is_Fixed_Point_Type (P_Type) then |
af31bd57 | 9383 | Fold_Ureal (N, Expr_Value_R (E1) + Small_Value (P_Type), Static); |
996ae0b0 | 9384 | |
fbf5a39b | 9385 | -- Modular integer case (wraps) |
996ae0b0 | 9386 | |
fbf5a39b AC |
9387 | elsif Is_Modular_Integer_Type (P_Type) then |
9388 | Fold_Uint (N, (Expr_Value (E1) + 1) mod Modulus (P_Type), Static); | |
996ae0b0 | 9389 | |
fbf5a39b | 9390 | -- Other scalar cases |
996ae0b0 | 9391 | |
fbf5a39b AC |
9392 | else |
9393 | pragma Assert (Is_Scalar_Type (P_Type)); | |
996ae0b0 | 9394 | |
fbf5a39b AC |
9395 | if Is_Enumeration_Type (P_Type) |
9396 | and then Expr_Value (E1) = | |
9397 | Expr_Value (Type_High_Bound (P_Base_Type)) | |
9398 | then | |
9399 | Apply_Compile_Time_Constraint_Error | |
9400 | (N, "Succ of `&''Last`", | |
9401 | CE_Overflow_Check_Failed, | |
9402 | Ent => P_Base_Type, | |
9403 | Warn => not Static); | |
996ae0b0 | 9404 | |
fbf5a39b AC |
9405 | Check_Expressions; |
9406 | return; | |
9407 | else | |
9408 | Fold_Uint (N, Expr_Value (E1) + 1, Static); | |
996ae0b0 RK |
9409 | end if; |
9410 | end if; | |
9411 | end Succ; | |
9412 | ||
9413 | ---------------- | |
9414 | -- Truncation -- | |
9415 | ---------------- | |
9416 | ||
9417 | when Attribute_Truncation => | |
af31bd57 AC |
9418 | Fold_Ureal |
9419 | (N, | |
9420 | Eval_Fat.Truncation (P_Base_Type, Expr_Value_R (E1)), | |
9421 | Static); | |
996ae0b0 RK |
9422 | |
9423 | ---------------- | |
9424 | -- Type_Class -- | |
9425 | ---------------- | |
9426 | ||
9427 | when Attribute_Type_Class => Type_Class : declare | |
9428 | Typ : constant Entity_Id := Underlying_Type (P_Base_Type); | |
9429 | Id : RE_Id; | |
9430 | ||
9431 | begin | |
d9d25d04 | 9432 | if Is_Descendant_Of_Address (Typ) then |
996ae0b0 RK |
9433 | Id := RE_Type_Class_Address; |
9434 | ||
9435 | elsif Is_Enumeration_Type (Typ) then | |
9436 | Id := RE_Type_Class_Enumeration; | |
9437 | ||
9438 | elsif Is_Integer_Type (Typ) then | |
9439 | Id := RE_Type_Class_Integer; | |
9440 | ||
9441 | elsif Is_Fixed_Point_Type (Typ) then | |
9442 | Id := RE_Type_Class_Fixed_Point; | |
9443 | ||
9444 | elsif Is_Floating_Point_Type (Typ) then | |
9445 | Id := RE_Type_Class_Floating_Point; | |
9446 | ||
9447 | elsif Is_Array_Type (Typ) then | |
9448 | Id := RE_Type_Class_Array; | |
9449 | ||
9450 | elsif Is_Record_Type (Typ) then | |
9451 | Id := RE_Type_Class_Record; | |
9452 | ||
9453 | elsif Is_Access_Type (Typ) then | |
9454 | Id := RE_Type_Class_Access; | |
9455 | ||
9456 | elsif Is_Enumeration_Type (Typ) then | |
9457 | Id := RE_Type_Class_Enumeration; | |
9458 | ||
9459 | elsif Is_Task_Type (Typ) then | |
9460 | Id := RE_Type_Class_Task; | |
9461 | ||
9462 | -- We treat protected types like task types. It would make more | |
9463 | -- sense to have another enumeration value, but after all the | |
9464 | -- whole point of this feature is to be exactly DEC compatible, | |
12a13f01 | 9465 | -- and changing the type Type_Class would not meet this requirement. |
996ae0b0 RK |
9466 | |
9467 | elsif Is_Protected_Type (Typ) then | |
9468 | Id := RE_Type_Class_Task; | |
9469 | ||
9470 | -- Not clear if there are any other possibilities, but if there | |
9471 | -- are, then we will treat them as the address case. | |
9472 | ||
9473 | else | |
9474 | Id := RE_Type_Class_Address; | |
9475 | end if; | |
9476 | ||
9477 | Rewrite (N, New_Occurrence_Of (RTE (Id), Loc)); | |
996ae0b0 RK |
9478 | end Type_Class; |
9479 | ||
9480 | ----------------------- | |
9481 | -- Unbiased_Rounding -- | |
9482 | ----------------------- | |
9483 | ||
9484 | when Attribute_Unbiased_Rounding => | |
af31bd57 AC |
9485 | Fold_Ureal |
9486 | (N, | |
9487 | Eval_Fat.Unbiased_Rounding (P_Base_Type, Expr_Value_R (E1)), | |
9488 | Static); | |
fbf5a39b AC |
9489 | |
9490 | ------------------------- | |
9491 | -- Unconstrained_Array -- | |
9492 | ------------------------- | |
9493 | ||
9494 | when Attribute_Unconstrained_Array => Unconstrained_Array : declare | |
9495 | Typ : constant Entity_Id := Underlying_Type (P_Type); | |
9496 | ||
9497 | begin | |
aa720a54 AC |
9498 | Rewrite (N, New_Occurrence_Of ( |
9499 | Boolean_Literals ( | |
9500 | Is_Array_Type (P_Type) | |
9501 | and then not Is_Constrained (Typ)), Loc)); | |
996ae0b0 | 9502 | |
fbf5a39b AC |
9503 | -- Analyze and resolve as boolean, note that this attribute is |
9504 | -- a static attribute in GNAT. | |
9505 | ||
9506 | Analyze_And_Resolve (N, Standard_Boolean); | |
9507 | Static := True; | |
edab6088 | 9508 | Set_Is_Static_Expression (N, True); |
fbf5a39b AC |
9509 | end Unconstrained_Array; |
9510 | ||
18a2ad5d AC |
9511 | -- Attribute Update is never static |
9512 | ||
18a2ad5d | 9513 | when Attribute_Update => |
08cd7c2f | 9514 | return; |
18a2ad5d | 9515 | |
996ae0b0 RK |
9516 | --------------- |
9517 | -- VADS_Size -- | |
9518 | --------------- | |
9519 | ||
9520 | -- Processing is shared with Size | |
9521 | ||
9522 | --------- | |
9523 | -- Val -- | |
9524 | --------- | |
9525 | ||
9526 | when Attribute_Val => Val : | |
9527 | begin | |
fbf5a39b AC |
9528 | if Expr_Value (E1) < Expr_Value (Type_Low_Bound (P_Base_Type)) |
9529 | or else | |
9530 | Expr_Value (E1) > Expr_Value (Type_High_Bound (P_Base_Type)) | |
9531 | then | |
9532 | Apply_Compile_Time_Constraint_Error | |
9533 | (N, "Val expression out of range", | |
9534 | CE_Range_Check_Failed, | |
9535 | Warn => not Static); | |
9536 | ||
9537 | Check_Expressions; | |
9538 | return; | |
9539 | ||
9540 | else | |
9541 | Fold_Uint (N, Expr_Value (E1), Static); | |
996ae0b0 RK |
9542 | end if; |
9543 | end Val; | |
9544 | ||
9545 | ---------------- | |
9546 | -- Value_Size -- | |
9547 | ---------------- | |
9548 | ||
edab6088 RD |
9549 | -- The Value_Size attribute for a type returns the RM size of the type. |
9550 | -- This an always be folded for scalar types, and can also be folded for | |
9551 | -- non-scalar types if the size is set. This is one of the places where | |
9552 | -- it is annoying that a size of zero means two things! | |
996ae0b0 RK |
9553 | |
9554 | when Attribute_Value_Size => Value_Size : declare | |
9555 | P_TypeA : constant Entity_Id := Underlying_Type (P_Type); | |
996ae0b0 | 9556 | begin |
edab6088 RD |
9557 | if Is_Scalar_Type (P_TypeA) or else RM_Size (P_TypeA) /= Uint_0 then |
9558 | Fold_Uint (N, RM_Size (P_TypeA), Static); | |
996ae0b0 | 9559 | end if; |
996ae0b0 RK |
9560 | end Value_Size; |
9561 | ||
9562 | ------------- | |
9563 | -- Version -- | |
9564 | ------------- | |
9565 | ||
9566 | -- Version can never be static | |
9567 | ||
9568 | when Attribute_Version => | |
9569 | null; | |
9570 | ||
9571 | ---------------- | |
9572 | -- Wide_Image -- | |
9573 | ---------------- | |
9574 | ||
9575 | -- Wide_Image is a scalar attribute, but is never static, because it | |
9576 | -- is not a static function (having a non-scalar argument (RM 4.9(22)) | |
9577 | ||
9578 | when Attribute_Wide_Image => | |
9579 | null; | |
9580 | ||
82c80734 RD |
9581 | --------------------- |
9582 | -- Wide_Wide_Image -- | |
9583 | --------------------- | |
9584 | ||
9585 | -- Wide_Wide_Image is a scalar attribute but is never static, because it | |
9586 | -- is not a static function (having a non-scalar argument (RM 4.9(22)). | |
9587 | ||
9588 | when Attribute_Wide_Wide_Image => | |
9589 | null; | |
9590 | ||
9591 | --------------------- | |
9592 | -- Wide_Wide_Width -- | |
9593 | --------------------- | |
9594 | ||
9595 | -- Processing for Wide_Wide_Width is combined with Width | |
9596 | ||
996ae0b0 RK |
9597 | ---------------- |
9598 | -- Wide_Width -- | |
9599 | ---------------- | |
9600 | ||
9601 | -- Processing for Wide_Width is combined with Width | |
9602 | ||
9603 | ----------- | |
9604 | -- Width -- | |
9605 | ----------- | |
9606 | ||
82c80734 | 9607 | -- This processing also handles the case of Wide_[Wide_]Width |
996ae0b0 | 9608 | |
82c80734 RD |
9609 | when Attribute_Width | |
9610 | Attribute_Wide_Width | | |
9611 | Attribute_Wide_Wide_Width => Width : | |
996ae0b0 | 9612 | begin |
fbf5a39b | 9613 | if Compile_Time_Known_Bounds (P_Type) then |
996ae0b0 RK |
9614 | |
9615 | -- Floating-point types | |
9616 | ||
9617 | if Is_Floating_Point_Type (P_Type) then | |
9618 | ||
9619 | -- Width is zero for a null range (RM 3.5 (38)) | |
9620 | ||
9621 | if Expr_Value_R (Type_High_Bound (P_Type)) < | |
9622 | Expr_Value_R (Type_Low_Bound (P_Type)) | |
9623 | then | |
edab6088 | 9624 | Fold_Uint (N, Uint_0, Static); |
996ae0b0 RK |
9625 | |
9626 | else | |
9627 | -- For floating-point, we have +N.dddE+nnn where length | |
9628 | -- of ddd is determined by type'Digits - 1, but is one | |
9629 | -- if Digits is one (RM 3.5 (33)). | |
9630 | ||
9631 | -- nnn is set to 2 for Short_Float and Float (32 bit | |
9632 | -- floats), and 3 for Long_Float and Long_Long_Float. | |
b8dc622e JM |
9633 | -- For machines where Long_Long_Float is the IEEE |
9634 | -- extended precision type, the exponent takes 4 digits. | |
996ae0b0 RK |
9635 | |
9636 | declare | |
9637 | Len : Int := | |
9638 | Int'Max (2, UI_To_Int (Digits_Value (P_Type))); | |
9639 | ||
9640 | begin | |
9641 | if Esize (P_Type) <= 32 then | |
9642 | Len := Len + 6; | |
b8dc622e | 9643 | elsif Esize (P_Type) = 64 then |
996ae0b0 | 9644 | Len := Len + 7; |
b8dc622e JM |
9645 | else |
9646 | Len := Len + 8; | |
996ae0b0 RK |
9647 | end if; |
9648 | ||
edab6088 | 9649 | Fold_Uint (N, UI_From_Int (Len), Static); |
996ae0b0 RK |
9650 | end; |
9651 | end if; | |
9652 | ||
9653 | -- Fixed-point types | |
9654 | ||
9655 | elsif Is_Fixed_Point_Type (P_Type) then | |
9656 | ||
9657 | -- Width is zero for a null range (RM 3.5 (38)) | |
9658 | ||
9659 | if Expr_Value (Type_High_Bound (P_Type)) < | |
9660 | Expr_Value (Type_Low_Bound (P_Type)) | |
9661 | then | |
edab6088 | 9662 | Fold_Uint (N, Uint_0, Static); |
996ae0b0 RK |
9663 | |
9664 | -- The non-null case depends on the specific real type | |
9665 | ||
9666 | else | |
9667 | -- For fixed-point type width is Fore + 1 + Aft (RM 3.5(34)) | |
9668 | ||
fbf5a39b | 9669 | Fold_Uint |
5087048c | 9670 | (N, UI_From_Int (Fore_Value + 1) + Aft_Value (P_Type), |
edab6088 | 9671 | Static); |
996ae0b0 RK |
9672 | end if; |
9673 | ||
9674 | -- Discrete types | |
9675 | ||
9676 | else | |
9677 | declare | |
9678 | R : constant Entity_Id := Root_Type (P_Type); | |
21d27997 RD |
9679 | Lo : constant Uint := Expr_Value (Type_Low_Bound (P_Type)); |
9680 | Hi : constant Uint := Expr_Value (Type_High_Bound (P_Type)); | |
996ae0b0 RK |
9681 | W : Nat; |
9682 | Wt : Nat; | |
9683 | T : Uint; | |
9684 | L : Node_Id; | |
9685 | C : Character; | |
9686 | ||
9687 | begin | |
9688 | -- Empty ranges | |
9689 | ||
9690 | if Lo > Hi then | |
9691 | W := 0; | |
9692 | ||
9693 | -- Width for types derived from Standard.Character | |
82c80734 | 9694 | -- and Standard.Wide_[Wide_]Character. |
996ae0b0 | 9695 | |
21d27997 | 9696 | elsif Is_Standard_Character_Type (P_Type) then |
996ae0b0 RK |
9697 | W := 0; |
9698 | ||
9699 | -- Set W larger if needed | |
9700 | ||
9701 | for J in UI_To_Int (Lo) .. UI_To_Int (Hi) loop | |
9702 | ||
edd63e9b | 9703 | -- All wide characters look like Hex_hhhhhhhh |
82c80734 | 9704 | |
996ae0b0 | 9705 | if J > 255 then |
39486058 | 9706 | |
a90bd866 | 9707 | -- No need to compute this more than once |
39486058 | 9708 | |
39486058 | 9709 | exit; |
996ae0b0 RK |
9710 | |
9711 | else | |
9712 | C := Character'Val (J); | |
9713 | ||
9714 | -- Test for all cases where Character'Image | |
9715 | -- yields an image that is longer than three | |
9716 | -- characters. First the cases of Reserved_xxx | |
9717 | -- names (length = 12). | |
9718 | ||
9719 | case C is | |
9720 | when Reserved_128 | Reserved_129 | | |
9721 | Reserved_132 | Reserved_153 | |
996ae0b0 RK |
9722 | => Wt := 12; |
9723 | ||
9724 | when BS | HT | LF | VT | FF | CR | | |
9725 | SO | SI | EM | FS | GS | RS | | |
9726 | US | RI | MW | ST | PM | |
996ae0b0 RK |
9727 | => Wt := 2; |
9728 | ||
9729 | when NUL | SOH | STX | ETX | EOT | | |
9730 | ENQ | ACK | BEL | DLE | DC1 | | |
9731 | DC2 | DC3 | DC4 | NAK | SYN | | |
9732 | ETB | CAN | SUB | ESC | DEL | | |
9733 | BPH | NBH | NEL | SSA | ESA | | |
9734 | HTS | HTJ | VTS | PLD | PLU | | |
9735 | SS2 | SS3 | DCS | PU1 | PU2 | | |
9736 | STS | CCH | SPA | EPA | SOS | | |
9737 | SCI | CSI | OSC | APC | |
996ae0b0 RK |
9738 | => Wt := 3; |
9739 | ||
9740 | when Space .. Tilde | | |
9741 | No_Break_Space .. LC_Y_Diaeresis | |
3786bbd1 RD |
9742 | => |
9743 | -- Special case of soft hyphen in Ada 2005 | |
9744 | ||
9745 | if C = Character'Val (16#AD#) | |
0791fbe9 | 9746 | and then Ada_Version >= Ada_2005 |
3786bbd1 RD |
9747 | then |
9748 | Wt := 11; | |
9749 | else | |
9750 | Wt := 3; | |
9751 | end if; | |
996ae0b0 RK |
9752 | end case; |
9753 | ||
9754 | W := Int'Max (W, Wt); | |
9755 | end if; | |
9756 | end loop; | |
9757 | ||
9758 | -- Width for types derived from Standard.Boolean | |
9759 | ||
9760 | elsif R = Standard_Boolean then | |
9761 | if Lo = 0 then | |
9762 | W := 5; -- FALSE | |
9763 | else | |
9764 | W := 4; -- TRUE | |
9765 | end if; | |
9766 | ||
9767 | -- Width for integer types | |
9768 | ||
9769 | elsif Is_Integer_Type (P_Type) then | |
9770 | T := UI_Max (abs Lo, abs Hi); | |
9771 | ||
9772 | W := 2; | |
9773 | while T >= 10 loop | |
9774 | W := W + 1; | |
9775 | T := T / 10; | |
9776 | end loop; | |
9777 | ||
8a06151a RD |
9778 | -- User declared enum type with discard names |
9779 | ||
9780 | elsif Discard_Names (R) then | |
9781 | ||
9782 | -- If range is null, result is zero, that has already | |
9783 | -- been dealt with, so what we need is the power of ten | |
9784 | -- that accomodates the Pos of the largest value, which | |
9785 | -- is the high bound of the range + one for the space. | |
9786 | ||
9787 | W := 1; | |
9788 | T := Hi; | |
9789 | while T /= 0 loop | |
9790 | T := T / 10; | |
9791 | W := W + 1; | |
9792 | end loop; | |
9793 | ||
996ae0b0 | 9794 | -- Only remaining possibility is user declared enum type |
8a06151a | 9795 | -- with normal case of Discard_Names not active. |
996ae0b0 RK |
9796 | |
9797 | else | |
9798 | pragma Assert (Is_Enumeration_Type (P_Type)); | |
9799 | ||
9800 | W := 0; | |
9801 | L := First_Literal (P_Type); | |
996ae0b0 RK |
9802 | while Present (L) loop |
9803 | ||
9804 | -- Only pay attention to in range characters | |
9805 | ||
9806 | if Lo <= Enumeration_Pos (L) | |
9807 | and then Enumeration_Pos (L) <= Hi | |
9808 | then | |
9809 | -- For Width case, use decoded name | |
9810 | ||
9811 | if Id = Attribute_Width then | |
9812 | Get_Decoded_Name_String (Chars (L)); | |
9813 | Wt := Nat (Name_Len); | |
9814 | ||
82c80734 RD |
9815 | -- For Wide_[Wide_]Width, use encoded name, and |
9816 | -- then adjust for the encoding. | |
996ae0b0 RK |
9817 | |
9818 | else | |
9819 | Get_Name_String (Chars (L)); | |
9820 | ||
9821 | -- Character literals are always of length 3 | |
9822 | ||
9823 | if Name_Buffer (1) = 'Q' then | |
9824 | Wt := 3; | |
9825 | ||
9826 | -- Otherwise loop to adjust for upper/wide chars | |
9827 | ||
9828 | else | |
9829 | Wt := Nat (Name_Len); | |
9830 | ||
9831 | for J in 1 .. Name_Len loop | |
9832 | if Name_Buffer (J) = 'U' then | |
9833 | Wt := Wt - 2; | |
9834 | elsif Name_Buffer (J) = 'W' then | |
9835 | Wt := Wt - 4; | |
9836 | end if; | |
9837 | end loop; | |
9838 | end if; | |
9839 | end if; | |
9840 | ||
9841 | W := Int'Max (W, Wt); | |
9842 | end if; | |
9843 | ||
9844 | Next_Literal (L); | |
9845 | end loop; | |
9846 | end if; | |
9847 | ||
edab6088 | 9848 | Fold_Uint (N, UI_From_Int (W), Static); |
996ae0b0 RK |
9849 | end; |
9850 | end if; | |
9851 | end if; | |
9852 | end Width; | |
9853 | ||
4adf3c50 | 9854 | -- The following attributes denote functions that cannot be folded |
54838d1f AC |
9855 | |
9856 | when Attribute_From_Any | | |
9857 | Attribute_To_Any | | |
9858 | Attribute_TypeCode => | |
9859 | null; | |
9860 | ||
996ae0b0 RK |
9861 | -- The following attributes can never be folded, and furthermore we |
9862 | -- should not even have entered the case statement for any of these. | |
9863 | -- Note that in some cases, the values have already been folded as | |
21db8699 RD |
9864 | -- a result of the processing in Analyze_Attribute or earlier in |
9865 | -- this procedure. | |
996ae0b0 | 9866 | |
7ed57189 AC |
9867 | when Attribute_Abort_Signal | |
9868 | Attribute_Access | | |
9869 | Attribute_Address | | |
9870 | Attribute_Address_Size | | |
9871 | Attribute_Asm_Input | | |
9872 | Attribute_Asm_Output | | |
9873 | Attribute_Base | | |
9874 | Attribute_Bit_Order | | |
9875 | Attribute_Bit_Position | | |
9876 | Attribute_Callable | | |
9877 | Attribute_Caller | | |
9878 | Attribute_Class | | |
9879 | Attribute_Code_Address | | |
9880 | Attribute_Compiler_Version | | |
9881 | Attribute_Count | | |
9882 | Attribute_Default_Bit_Order | | |
9883 | Attribute_Default_Scalar_Storage_Order | | |
eaed2a2c | 9884 | Attribute_Deref | |
7ed57189 AC |
9885 | Attribute_Elaborated | |
9886 | Attribute_Elab_Body | | |
9887 | Attribute_Elab_Spec | | |
9888 | Attribute_Elab_Subp_Body | | |
9889 | Attribute_Enabled | | |
9890 | Attribute_External_Tag | | |
9891 | Attribute_Fast_Math | | |
9892 | Attribute_First_Bit | | |
21db8699 | 9893 | Attribute_Img | |
7ed57189 AC |
9894 | Attribute_Input | |
9895 | Attribute_Last_Bit | | |
9896 | Attribute_Library_Level | | |
9897 | Attribute_Maximum_Alignment | | |
9898 | Attribute_Old | | |
9899 | Attribute_Output | | |
9900 | Attribute_Partition_ID | | |
9901 | Attribute_Pool_Address | | |
9902 | Attribute_Position | | |
9903 | Attribute_Priority | | |
9904 | Attribute_Read | | |
9905 | Attribute_Result | | |
9906 | Attribute_Scalar_Storage_Order | | |
9907 | Attribute_Simple_Storage_Pool | | |
9908 | Attribute_Storage_Pool | | |
9909 | Attribute_Storage_Size | | |
9910 | Attribute_Storage_Unit | | |
9911 | Attribute_Stub_Type | | |
9912 | Attribute_System_Allocator_Alignment | | |
9913 | Attribute_Tag | | |
9914 | Attribute_Target_Name | | |
9915 | Attribute_Terminated | | |
9916 | Attribute_To_Address | | |
9917 | Attribute_Type_Key | | |
7ed57189 AC |
9918 | Attribute_Unchecked_Access | |
9919 | Attribute_Universal_Literal_String | | |
9920 | Attribute_Unrestricted_Access | | |
9921 | Attribute_Valid | | |
9922 | Attribute_Valid_Scalars | | |
9923 | Attribute_Value | | |
9924 | Attribute_Wchar_T_Size | | |
9925 | Attribute_Wide_Value | | |
9926 | Attribute_Wide_Wide_Value | | |
9927 | Attribute_Word_Size | | |
9928 | Attribute_Write => | |
996ae0b0 RK |
9929 | |
9930 | raise Program_Error; | |
996ae0b0 RK |
9931 | end case; |
9932 | ||
9933 | -- At the end of the case, one more check. If we did a static evaluation | |
9934 | -- so that the result is now a literal, then set Is_Static_Expression | |
9935 | -- in the constant only if the prefix type is a static subtype. For | |
9936 | -- non-static subtypes, the folding is still OK, but not static. | |
9937 | ||
fbf5a39b AC |
9938 | -- An exception is the GNAT attribute Constrained_Array which is |
9939 | -- defined to be a static attribute in all cases. | |
9940 | ||
e10dab7f JM |
9941 | if Nkind_In (N, N_Integer_Literal, |
9942 | N_Real_Literal, | |
9943 | N_Character_Literal, | |
9944 | N_String_Literal) | |
996ae0b0 RK |
9945 | or else (Is_Entity_Name (N) |
9946 | and then Ekind (Entity (N)) = E_Enumeration_Literal) | |
9947 | then | |
9948 | Set_Is_Static_Expression (N, Static); | |
9949 | ||
9950 | -- If this is still an attribute reference, then it has not been folded | |
9951 | -- and that means that its expressions are in a non-static context. | |
9952 | ||
9953 | elsif Nkind (N) = N_Attribute_Reference then | |
9954 | Check_Expressions; | |
9955 | ||
9956 | -- Note: the else case not covered here are odd cases where the | |
9957 | -- processing has transformed the attribute into something other | |
9958 | -- than a constant. Nothing more to do in such cases. | |
9959 | ||
9960 | else | |
9961 | null; | |
9962 | end if; | |
996ae0b0 RK |
9963 | end Eval_Attribute; |
9964 | ||
9965 | ------------------------------ | |
9966 | -- Is_Anonymous_Tagged_Base -- | |
9967 | ------------------------------ | |
9968 | ||
9969 | function Is_Anonymous_Tagged_Base | |
9970 | (Anon : Entity_Id; | |
155562cb | 9971 | Typ : Entity_Id) return Boolean |
996ae0b0 RK |
9972 | is |
9973 | begin | |
9974 | return | |
9975 | Anon = Current_Scope | |
9976 | and then Is_Itype (Anon) | |
9977 | and then Associated_Node_For_Itype (Anon) = Parent (Typ); | |
9978 | end Is_Anonymous_Tagged_Base; | |
9979 | ||
442ade9d RD |
9980 | -------------------------------- |
9981 | -- Name_Implies_Lvalue_Prefix -- | |
9982 | -------------------------------- | |
822033eb | 9983 | |
442ade9d | 9984 | function Name_Implies_Lvalue_Prefix (Nam : Name_Id) return Boolean is |
822033eb HK |
9985 | pragma Assert (Is_Attribute_Name (Nam)); |
9986 | begin | |
442ade9d RD |
9987 | return Attribute_Name_Implies_Lvalue_Prefix (Get_Attribute_Id (Nam)); |
9988 | end Name_Implies_Lvalue_Prefix; | |
822033eb | 9989 | |
996ae0b0 RK |
9990 | ----------------------- |
9991 | -- Resolve_Attribute -- | |
9992 | ----------------------- | |
9993 | ||
9994 | procedure Resolve_Attribute (N : Node_Id; Typ : Entity_Id) is | |
9995 | Loc : constant Source_Ptr := Sloc (N); | |
9996 | P : constant Node_Id := Prefix (N); | |
9997 | Aname : constant Name_Id := Attribute_Name (N); | |
9998 | Attr_Id : constant Attribute_Id := Get_Attribute_Id (Aname); | |
fbf5a39b | 9999 | Btyp : constant Entity_Id := Base_Type (Typ); |
468c6c8a | 10000 | Des_Btyp : Entity_Id; |
996ae0b0 RK |
10001 | Index : Interp_Index; |
10002 | It : Interp; | |
996ae0b0 RK |
10003 | Nom_Subt : Entity_Id; |
10004 | ||
f529bac5 ES |
10005 | procedure Accessibility_Message; |
10006 | -- Error, or warning within an instance, if the static accessibility | |
10007 | -- rules of 3.10.2 are violated. | |
10008 | ||
46413d9e AC |
10009 | function Declared_Within_Generic_Unit |
10010 | (Entity : Entity_Id; | |
10011 | Generic_Unit : Node_Id) return Boolean; | |
10012 | -- Returns True if Declared_Entity is declared within the declarative | |
10013 | -- region of Generic_Unit; otherwise returns False. | |
10014 | ||
f529bac5 ES |
10015 | --------------------------- |
10016 | -- Accessibility_Message -- | |
10017 | --------------------------- | |
10018 | ||
10019 | procedure Accessibility_Message is | |
10020 | Indic : Node_Id := Parent (Parent (N)); | |
10021 | ||
10022 | begin | |
10023 | -- In an instance, this is a runtime check, but one we | |
10024 | -- know will fail, so generate an appropriate warning. | |
10025 | ||
10026 | if In_Instance_Body then | |
43417b90 | 10027 | Error_Msg_Warn := SPARK_Mode /= On; |
822033eb | 10028 | Error_Msg_F |
4a28b181 AC |
10029 | ("non-local pointer cannot point to local object<<", P); |
10030 | Error_Msg_F ("\Program_Error [<<", P); | |
f529bac5 ES |
10031 | Rewrite (N, |
10032 | Make_Raise_Program_Error (Loc, | |
10033 | Reason => PE_Accessibility_Check_Failed)); | |
10034 | Set_Etype (N, Typ); | |
10035 | return; | |
10036 | ||
10037 | else | |
ed2233dc | 10038 | Error_Msg_F ("non-local pointer cannot point to local object", P); |
f529bac5 ES |
10039 | |
10040 | -- Check for case where we have a missing access definition | |
10041 | ||
10042 | if Is_Record_Type (Current_Scope) | |
10043 | and then | |
e10dab7f JM |
10044 | Nkind_In (Parent (N), N_Discriminant_Association, |
10045 | N_Index_Or_Discriminant_Constraint) | |
f529bac5 ES |
10046 | then |
10047 | Indic := Parent (Parent (N)); | |
10048 | while Present (Indic) | |
10049 | and then Nkind (Indic) /= N_Subtype_Indication | |
10050 | loop | |
10051 | Indic := Parent (Indic); | |
10052 | end loop; | |
10053 | ||
10054 | if Present (Indic) then | |
10055 | Error_Msg_NE | |
10056 | ("\use an access definition for" & | |
822033eb HK |
10057 | " the access discriminant of&", |
10058 | N, Entity (Subtype_Mark (Indic))); | |
f529bac5 ES |
10059 | end if; |
10060 | end if; | |
10061 | end if; | |
10062 | end Accessibility_Message; | |
10063 | ||
46413d9e AC |
10064 | ---------------------------------- |
10065 | -- Declared_Within_Generic_Unit -- | |
10066 | ---------------------------------- | |
10067 | ||
10068 | function Declared_Within_Generic_Unit | |
10069 | (Entity : Entity_Id; | |
10070 | Generic_Unit : Node_Id) return Boolean | |
10071 | is | |
10072 | Generic_Encloser : Node_Id := Enclosing_Generic_Unit (Entity); | |
10073 | ||
10074 | begin | |
10075 | while Present (Generic_Encloser) loop | |
10076 | if Generic_Encloser = Generic_Unit then | |
10077 | return True; | |
10078 | end if; | |
10079 | ||
10080 | -- We have to step to the scope of the generic's entity, because | |
10081 | -- otherwise we'll just get back the same generic. | |
10082 | ||
10083 | Generic_Encloser := | |
10084 | Enclosing_Generic_Unit | |
10085 | (Scope (Defining_Entity (Generic_Encloser))); | |
10086 | end loop; | |
10087 | ||
10088 | return False; | |
10089 | end Declared_Within_Generic_Unit; | |
10090 | ||
f529bac5 ES |
10091 | -- Start of processing for Resolve_Attribute |
10092 | ||
996ae0b0 | 10093 | begin |
3b42c566 RD |
10094 | -- If error during analysis, no point in continuing, except for array |
10095 | -- types, where we get better recovery by using unconstrained indexes | |
10096 | -- than nothing at all (see Check_Array_Type). | |
996ae0b0 RK |
10097 | |
10098 | if Error_Posted (N) | |
10099 | and then Attr_Id /= Attribute_First | |
10100 | and then Attr_Id /= Attribute_Last | |
10101 | and then Attr_Id /= Attribute_Length | |
10102 | and then Attr_Id /= Attribute_Range | |
10103 | then | |
10104 | return; | |
10105 | end if; | |
10106 | ||
10107 | -- If attribute was universal type, reset to actual type | |
10108 | ||
10109 | if Etype (N) = Universal_Integer | |
10110 | or else Etype (N) = Universal_Real | |
10111 | then | |
10112 | Set_Etype (N, Typ); | |
10113 | end if; | |
10114 | ||
10115 | -- Remaining processing depends on attribute | |
10116 | ||
10117 | case Attr_Id is | |
10118 | ||
10119 | ------------ | |
10120 | -- Access -- | |
10121 | ------------ | |
10122 | ||
10123 | -- For access attributes, if the prefix denotes an entity, it is | |
10124 | -- interpreted as a name, never as a call. It may be overloaded, | |
10125 | -- in which case resolution uses the profile of the context type. | |
10126 | -- Otherwise prefix must be resolved. | |
10127 | ||
10128 | when Attribute_Access | |
10129 | | Attribute_Unchecked_Access | |
10130 | | Attribute_Unrestricted_Access => | |
10131 | ||
e7ba564f | 10132 | Access_Attribute : |
e10dab7f | 10133 | begin |
91669e7e AC |
10134 | -- Note possible modification if we have a variable |
10135 | ||
996ae0b0 | 10136 | if Is_Variable (P) then |
91669e7e AC |
10137 | declare |
10138 | PN : constant Node_Id := Parent (N); | |
10139 | Nm : Node_Id; | |
10140 | ||
10141 | Note : Boolean := True; | |
10142 | -- Skip this for the case of Unrestricted_Access occuring in | |
10143 | -- the context of a Valid check, since this otherwise leads | |
10144 | -- to a missed warning (the Valid check does not really | |
10145 | -- modify!) If this case, Note will be reset to False. | |
10146 | ||
81501d2b AC |
10147 | -- Skip it as well if the type is an Acccess_To_Constant, |
10148 | -- given that no use of the value can modify the prefix. | |
10149 | ||
91669e7e AC |
10150 | begin |
10151 | if Attr_Id = Attribute_Unrestricted_Access | |
10152 | and then Nkind (PN) = N_Function_Call | |
10153 | then | |
10154 | Nm := Name (PN); | |
10155 | ||
10156 | if Nkind (Nm) = N_Expanded_Name | |
10157 | and then Chars (Nm) = Name_Valid | |
10158 | and then Nkind (Prefix (Nm)) = N_Identifier | |
10159 | and then Chars (Prefix (Nm)) = Name_Attr_Long_Float | |
10160 | then | |
10161 | Note := False; | |
10162 | end if; | |
81501d2b AC |
10163 | |
10164 | elsif Is_Access_Constant (Typ) then | |
10165 | Note := False; | |
91669e7e AC |
10166 | end if; |
10167 | ||
10168 | if Note then | |
10169 | Note_Possible_Modification (P, Sure => False); | |
10170 | end if; | |
10171 | end; | |
996ae0b0 RK |
10172 | end if; |
10173 | ||
b07b7ace AC |
10174 | -- The following comes from a query concerning improper use of |
10175 | -- universal_access in equality tests involving anonymous access | |
10176 | -- types. Another good reason for 'Ref, but for now disable the | |
10177 | -- test, which breaks several filed tests??? | |
8d9509fd ES |
10178 | |
10179 | if Ekind (Typ) = E_Anonymous_Access_Type | |
10180 | and then Nkind_In (Parent (N), N_Op_Eq, N_Op_Ne) | |
10181 | and then False | |
10182 | then | |
10183 | Error_Msg_N ("need unique type to resolve 'Access", N); | |
10184 | Error_Msg_N ("\qualify attribute with some access type", N); | |
10185 | end if; | |
10186 | ||
b07b7ace AC |
10187 | -- Case where prefix is an entity name |
10188 | ||
996ae0b0 | 10189 | if Is_Entity_Name (P) then |
b07b7ace AC |
10190 | |
10191 | -- Deal with case where prefix itself is overloaded | |
10192 | ||
996ae0b0 RK |
10193 | if Is_Overloaded (P) then |
10194 | Get_First_Interp (P, Index, It); | |
996ae0b0 | 10195 | while Present (It.Nam) loop |
996ae0b0 RK |
10196 | if Type_Conformant (Designated_Type (Typ), It.Nam) then |
10197 | Set_Entity (P, It.Nam); | |
10198 | ||
fea9e956 ES |
10199 | -- The prefix is definitely NOT overloaded anymore at |
10200 | -- this point, so we reset the Is_Overloaded flag to | |
10201 | -- avoid any confusion when reanalyzing the node. | |
996ae0b0 RK |
10202 | |
10203 | Set_Is_Overloaded (P, False); | |
fea9e956 | 10204 | Set_Is_Overloaded (N, False); |
996ae0b0 RK |
10205 | Generate_Reference (Entity (P), P); |
10206 | exit; | |
10207 | end if; | |
10208 | ||
10209 | Get_Next_Interp (Index, It); | |
10210 | end loop; | |
10211 | ||
16e764a7 | 10212 | -- If Prefix is a subprogram name, this reference freezes, |
6dc87f5f AC |
10213 | -- but not if within spec expression mode. The profile of |
10214 | -- the subprogram is not frozen at this point. | |
16e764a7 AC |
10215 | |
10216 | if not In_Spec_Expression then | |
b1d8d229 | 10217 | Freeze_Before (N, Entity (P), Do_Freeze_Profile => False); |
16e764a7 | 10218 | end if; |
442ade9d | 10219 | |
6dc87f5f AC |
10220 | -- If it is a type, there is nothing to resolve. |
10221 | -- If it is a subprogram, do not freeze its profile. | |
10222 | -- If it is an object, complete its resolution. | |
996ae0b0 | 10223 | |
fea9e956 | 10224 | elsif Is_Overloadable (Entity (P)) then |
21d27997 | 10225 | if not In_Spec_Expression then |
b1d8d229 | 10226 | Freeze_Before (N, Entity (P), Do_Freeze_Profile => False); |
fea9e956 ES |
10227 | end if; |
10228 | ||
b07b7ace AC |
10229 | -- Nothing to do if prefix is a type name |
10230 | ||
fea9e956 ES |
10231 | elsif Is_Type (Entity (P)) then |
10232 | null; | |
b07b7ace AC |
10233 | |
10234 | -- Otherwise non-overloaded other case, resolve the prefix | |
10235 | ||
fea9e956 | 10236 | else |
fbf5a39b | 10237 | Resolve (P); |
996ae0b0 RK |
10238 | end if; |
10239 | ||
b07b7ace AC |
10240 | -- Some further error checks |
10241 | ||
12e0c41c AC |
10242 | Error_Msg_Name_1 := Aname; |
10243 | ||
996ae0b0 RK |
10244 | if not Is_Entity_Name (P) then |
10245 | null; | |
10246 | ||
fea9e956 ES |
10247 | elsif Is_Overloadable (Entity (P)) |
10248 | and then Is_Abstract_Subprogram (Entity (P)) | |
996ae0b0 | 10249 | then |
822033eb | 10250 | Error_Msg_F ("prefix of % attribute cannot be abstract", P); |
996ae0b0 RK |
10251 | Set_Etype (N, Any_Type); |
10252 | ||
53f697ee AC |
10253 | elsif Ekind (Entity (P)) = E_Enumeration_Literal then |
10254 | Error_Msg_F | |
d7cb47b4 | 10255 | ("prefix of % attribute cannot be enumeration literal", P); |
53f697ee | 10256 | Set_Etype (N, Any_Type); |
996ae0b0 | 10257 | |
53f697ee AC |
10258 | -- An attempt to take 'Access of a function that renames an |
10259 | -- enumeration literal. Issue a specialized error message. | |
10260 | ||
10261 | elsif Ekind (Entity (P)) = E_Function | |
10262 | and then Present (Alias (Entity (P))) | |
10263 | and then Ekind (Alias (Entity (P))) = E_Enumeration_Literal | |
10264 | then | |
10265 | Error_Msg_F | |
d7cb47b4 AC |
10266 | ("prefix of % attribute cannot be function renaming " |
10267 | & "an enumeration literal", P); | |
53f697ee AC |
10268 | Set_Etype (N, Any_Type); |
10269 | ||
10270 | elsif Convention (Entity (P)) = Convention_Intrinsic then | |
d7cb47b4 | 10271 | Error_Msg_F ("prefix of % attribute cannot be intrinsic", P); |
996ae0b0 RK |
10272 | Set_Etype (N, Any_Type); |
10273 | end if; | |
10274 | ||
10275 | -- Assignments, return statements, components of aggregates, | |
10276 | -- generic instantiations will require convention checks if | |
10277 | -- the type is an access to subprogram. Given that there will | |
10278 | -- also be accessibility checks on those, this is where the | |
10279 | -- checks can eventually be centralized ??? | |
10280 | ||
e1b871e9 AC |
10281 | if Ekind_In (Btyp, E_Access_Subprogram_Type, |
10282 | E_Anonymous_Access_Subprogram_Type, | |
1a265e78 | 10283 | E_Access_Protected_Subprogram_Type, |
e1b871e9 | 10284 | E_Anonymous_Access_Protected_Subprogram_Type) |
af4b9434 | 10285 | then |
822033eb HK |
10286 | -- Deal with convention mismatch |
10287 | ||
1a265e78 AC |
10288 | if Convention (Designated_Type (Btyp)) /= |
10289 | Convention (Entity (P)) | |
10290 | then | |
822033eb HK |
10291 | Error_Msg_FE |
10292 | ("subprogram & has wrong convention", P, Entity (P)); | |
80c2c202 AC |
10293 | Error_Msg_Sloc := Sloc (Btyp); |
10294 | Error_Msg_FE ("\does not match & declared#", P, Btyp); | |
822033eb | 10295 | |
80c2c202 AC |
10296 | if not Is_Itype (Btyp) |
10297 | and then not Has_Convention_Pragma (Btyp) | |
10298 | then | |
822033eb HK |
10299 | Error_Msg_FE |
10300 | ("\probable missing pragma Convention for &", | |
10301 | P, Btyp); | |
10302 | end if; | |
996ae0b0 RK |
10303 | |
10304 | else | |
10305 | Check_Subtype_Conformant | |
10306 | (New_Id => Entity (P), | |
10307 | Old_Id => Designated_Type (Btyp), | |
10308 | Err_Loc => P); | |
10309 | end if; | |
10310 | ||
10311 | if Attr_Id = Attribute_Unchecked_Access then | |
10312 | Error_Msg_Name_1 := Aname; | |
822033eb | 10313 | Error_Msg_F |
996ae0b0 RK |
10314 | ("attribute% cannot be applied to a subprogram", P); |
10315 | ||
10316 | elsif Aname = Name_Unrestricted_Access then | |
10317 | null; -- Nothing to check | |
10318 | ||
b8dc622e JM |
10319 | -- Check the static accessibility rule of 3.10.2(32). |
10320 | -- This rule also applies within the private part of an | |
10321 | -- instantiation. This rule does not apply to anonymous | |
2995ebee | 10322 | -- access-to-subprogram types in access parameters. |
996ae0b0 RK |
10323 | |
10324 | elsif Attr_Id = Attribute_Access | |
b8dc622e | 10325 | and then not In_Instance_Body |
2995ebee AC |
10326 | and then |
10327 | (Ekind (Btyp) = E_Access_Subprogram_Type | |
10328 | or else Is_Local_Anonymous_Access (Btyp)) | |
af4b9434 AC |
10329 | and then Subprogram_Access_Level (Entity (P)) > |
10330 | Type_Access_Level (Btyp) | |
996ae0b0 | 10331 | then |
822033eb | 10332 | Error_Msg_F |
b8dc622e JM |
10333 | ("subprogram must not be deeper than access type", P); |
10334 | ||
10335 | -- Check the restriction of 3.10.2(32) that disallows the | |
10336 | -- access attribute within a generic body when the ultimate | |
10337 | -- ancestor of the type of the attribute is declared outside | |
10338 | -- of the generic unit and the subprogram is declared within | |
10339 | -- that generic unit. This includes any such attribute that | |
10340 | -- occurs within the body of a generic unit that is a child | |
10341 | -- of the generic unit where the subprogram is declared. | |
599a7411 | 10342 | |
12a13f01 | 10343 | -- The rule also prohibits applying the attribute when the |
b8dc622e JM |
10344 | -- access type is a generic formal access type (since the |
10345 | -- level of the actual type is not known). This restriction | |
10346 | -- does not apply when the attribute type is an anonymous | |
10347 | -- access-to-subprogram type. Note that this check was | |
46413d9e | 10348 | -- revised by AI-229, because the original Ada 95 rule |
b8dc622e JM |
10349 | -- was too lax. The original rule only applied when the |
10350 | -- subprogram was declared within the body of the generic, | |
10351 | -- which allowed the possibility of dangling references). | |
46413d9e | 10352 | -- The rule was also too strict in some cases, in that it |
b8dc622e JM |
10353 | -- didn't permit the access to be declared in the generic |
10354 | -- spec, whereas the revised rule does (as long as it's not | |
10355 | -- a formal type). | |
10356 | ||
10357 | -- There are a couple of subtleties of the test for applying | |
10358 | -- the check that are worth noting. First, we only apply it | |
10359 | -- when the levels of the subprogram and access type are the | |
10360 | -- same (the case where the subprogram is statically deeper | |
10361 | -- was applied above, and the case where the type is deeper | |
10362 | -- is always safe). Second, we want the check to apply | |
10363 | -- within nested generic bodies and generic child unit | |
10364 | -- bodies, but not to apply to an attribute that appears in | |
10365 | -- the generic unit's specification. This is done by testing | |
10366 | -- that the attribute's innermost enclosing generic body is | |
10367 | -- not the same as the innermost generic body enclosing the | |
10368 | -- generic unit where the subprogram is declared (we don't | |
10369 | -- want the check to apply when the access attribute is in | |
10370 | -- the spec and there's some other generic body enclosing | |
10371 | -- generic). Finally, there's no point applying the check | |
822033eb HK |
10372 | -- when within an instance, because any violations will have |
10373 | -- been caught by the compilation of the generic unit. | |
f529bac5 | 10374 | |
303fbb20 AC |
10375 | -- We relax this check in Relaxed_RM_Semantics mode for |
10376 | -- compatibility with legacy code for use by Ada source | |
10377 | -- code analyzers (e.g. CodePeer). | |
8cce3d75 | 10378 | |
b8dc622e | 10379 | elsif Attr_Id = Attribute_Access |
303fbb20 | 10380 | and then not Relaxed_RM_Semantics |
b8dc622e JM |
10381 | and then not In_Instance |
10382 | and then Present (Enclosing_Generic_Unit (Entity (P))) | |
10383 | and then Present (Enclosing_Generic_Body (N)) | |
10384 | and then Enclosing_Generic_Body (N) /= | |
10385 | Enclosing_Generic_Body | |
10386 | (Enclosing_Generic_Unit (Entity (P))) | |
10387 | and then Subprogram_Access_Level (Entity (P)) = | |
10388 | Type_Access_Level (Btyp) | |
10389 | and then Ekind (Btyp) /= | |
10390 | E_Anonymous_Access_Subprogram_Type | |
10391 | and then Ekind (Btyp) /= | |
10392 | E_Anonymous_Access_Protected_Subprogram_Type | |
996ae0b0 | 10393 | then |
b8dc622e JM |
10394 | -- The attribute type's ultimate ancestor must be |
10395 | -- declared within the same generic unit as the | |
46413d9e AC |
10396 | -- subprogram is declared (including within another |
10397 | -- nested generic unit). The error message is | |
8cce3d75 AC |
10398 | -- specialized to say "ancestor" for the case where the |
10399 | -- access type is not its own ancestor, since saying | |
10400 | -- simply "access type" would be very confusing. | |
b8dc622e | 10401 | |
46413d9e AC |
10402 | if not Declared_Within_Generic_Unit |
10403 | (Root_Type (Btyp), | |
10404 | Enclosing_Generic_Unit (Entity (P))) | |
b8dc622e | 10405 | then |
fea9e956 ES |
10406 | Error_Msg_N |
10407 | ("''Access attribute not allowed in generic body", | |
10408 | N); | |
10409 | ||
b8dc622e | 10410 | if Root_Type (Btyp) = Btyp then |
fea9e956 ES |
10411 | Error_Msg_NE |
10412 | ("\because " & | |
10413 | "access type & is declared outside " & | |
442ade9d | 10414 | "generic unit (RM 3.10.2(32))", N, Btyp); |
b8dc622e | 10415 | else |
fea9e956 ES |
10416 | Error_Msg_NE |
10417 | ("\because ancestor of " & | |
10418 | "access type & is declared outside " & | |
442ade9d | 10419 | "generic unit (RM 3.10.2(32))", N, Btyp); |
b8dc622e JM |
10420 | end if; |
10421 | ||
fea9e956 ES |
10422 | Error_Msg_NE |
10423 | ("\move ''Access to private part, or " & | |
10424 | "(Ada 2005) use anonymous access type instead of &", | |
10425 | N, Btyp); | |
10426 | ||
b8dc622e JM |
10427 | -- If the ultimate ancestor of the attribute's type is |
10428 | -- a formal type, then the attribute is illegal because | |
10429 | -- the actual type might be declared at a higher level. | |
10430 | -- The error message is specialized to say "ancestor" | |
10431 | -- for the case where the access type is not its own | |
10432 | -- ancestor, since saying simply "access type" would be | |
10433 | -- very confusing. | |
10434 | ||
10435 | elsif Is_Generic_Type (Root_Type (Btyp)) then | |
10436 | if Root_Type (Btyp) = Btyp then | |
10437 | Error_Msg_N | |
10438 | ("access type must not be a generic formal type", | |
10439 | N); | |
10440 | else | |
10441 | Error_Msg_N | |
10442 | ("ancestor access type must not be a generic " & | |
10443 | "formal type", N); | |
10444 | end if; | |
10445 | end if; | |
996ae0b0 RK |
10446 | end if; |
10447 | end if; | |
10448 | ||
5d09245e | 10449 | -- If this is a renaming, an inherited operation, or a |
fea9e956 ES |
10450 | -- subprogram instance, use the original entity. This may make |
10451 | -- the node type-inconsistent, so this transformation can only | |
10452 | -- be done if the node will not be reanalyzed. In particular, | |
10453 | -- if it is within a default expression, the transformation | |
10454 | -- must be delayed until the default subprogram is created for | |
10455 | -- it, when the enclosing subprogram is frozen. | |
996ae0b0 RK |
10456 | |
10457 | if Is_Entity_Name (P) | |
10458 | and then Is_Overloadable (Entity (P)) | |
10459 | and then Present (Alias (Entity (P))) | |
fea9e956 | 10460 | and then Expander_Active |
996ae0b0 RK |
10461 | then |
10462 | Rewrite (P, | |
10463 | New_Occurrence_Of (Alias (Entity (P)), Sloc (P))); | |
10464 | end if; | |
10465 | ||
10466 | elsif Nkind (P) = N_Selected_Component | |
10467 | and then Is_Overloadable (Entity (Selector_Name (P))) | |
10468 | then | |
10469 | -- Protected operation. If operation is overloaded, must | |
10470 | -- disambiguate. Prefix that denotes protected object itself | |
10471 | -- is resolved with its own type. | |
10472 | ||
10473 | if Attr_Id = Attribute_Unchecked_Access then | |
10474 | Error_Msg_Name_1 := Aname; | |
822033eb | 10475 | Error_Msg_F |
996ae0b0 RK |
10476 | ("attribute% cannot be applied to protected operation", P); |
10477 | end if; | |
10478 | ||
fbf5a39b | 10479 | Resolve (Prefix (P)); |
07fc65c4 | 10480 | Generate_Reference (Entity (Selector_Name (P)), P); |
996ae0b0 | 10481 | |
289a994b AC |
10482 | -- Implement check implied by 3.10.2 (18.1/2) : F.all'access is |
10483 | -- statically illegal if F is an anonymous access to subprogram. | |
10484 | ||
10485 | elsif Nkind (P) = N_Explicit_Dereference | |
10486 | and then Is_Entity_Name (Prefix (P)) | |
10487 | and then Ekind (Etype (Entity (Prefix (P)))) = | |
10488 | E_Anonymous_Access_Subprogram_Type | |
10489 | then | |
10490 | Error_Msg_N ("anonymous access to subprogram " | |
10491 | & "has deeper accessibility than any master", P); | |
10492 | ||
996ae0b0 RK |
10493 | elsif Is_Overloaded (P) then |
10494 | ||
5f3ab6fb AC |
10495 | -- Use the designated type of the context to disambiguate |
10496 | -- Note that this was not strictly conformant to Ada 95, | |
10497 | -- but was the implementation adopted by most Ada 95 compilers. | |
10498 | -- The use of the context type to resolve an Access attribute | |
10499 | -- reference is now mandated in AI-235 for Ada 2005. | |
5d09245e | 10500 | |
996ae0b0 RK |
10501 | declare |
10502 | Index : Interp_Index; | |
10503 | It : Interp; | |
5f3ab6fb | 10504 | |
996ae0b0 RK |
10505 | begin |
10506 | Get_First_Interp (P, Index, It); | |
996ae0b0 RK |
10507 | while Present (It.Typ) loop |
10508 | if Covers (Designated_Type (Typ), It.Typ) then | |
10509 | Resolve (P, It.Typ); | |
10510 | exit; | |
10511 | end if; | |
10512 | ||
10513 | Get_Next_Interp (Index, It); | |
10514 | end loop; | |
10515 | end; | |
10516 | else | |
fbf5a39b | 10517 | Resolve (P); |
996ae0b0 RK |
10518 | end if; |
10519 | ||
822033eb HK |
10520 | -- X'Access is illegal if X denotes a constant and the access type |
10521 | -- is access-to-variable. Same for 'Unchecked_Access. The rule | |
10522 | -- does not apply to 'Unrestricted_Access. If the reference is a | |
10523 | -- default-initialized aggregate component for a self-referential | |
10524 | -- type the reference is legal. | |
996ae0b0 RK |
10525 | |
10526 | if not (Ekind (Btyp) = E_Access_Subprogram_Type | |
af4b9434 | 10527 | or else Ekind (Btyp) = E_Anonymous_Access_Subprogram_Type |
442ade9d RD |
10528 | or else (Is_Record_Type (Btyp) |
10529 | and then | |
10530 | Present (Corresponding_Remote_Type (Btyp))) | |
996ae0b0 | 10531 | or else Ekind (Btyp) = E_Access_Protected_Subprogram_Type |
af4b9434 AC |
10532 | or else Ekind (Btyp) |
10533 | = E_Anonymous_Access_Protected_Subprogram_Type | |
996ae0b0 RK |
10534 | or else Is_Access_Constant (Btyp) |
10535 | or else Is_Variable (P) | |
10536 | or else Attr_Id = Attribute_Unrestricted_Access) | |
10537 | then | |
468c6c8a ES |
10538 | if Is_Entity_Name (P) |
10539 | and then Is_Type (Entity (P)) | |
10540 | then | |
10541 | -- Legality of a self-reference through an access | |
10542 | -- attribute has been verified in Analyze_Access_Attribute. | |
10543 | ||
10544 | null; | |
10545 | ||
10546 | elsif Comes_From_Source (N) then | |
822033eb | 10547 | Error_Msg_F ("access-to-variable designates constant", P); |
996ae0b0 RK |
10548 | end if; |
10549 | end if; | |
10550 | ||
7b76e805 RD |
10551 | Des_Btyp := Designated_Type (Btyp); |
10552 | ||
0791fbe9 | 10553 | if Ada_Version >= Ada_2005 |
7b76e805 RD |
10554 | and then Is_Incomplete_Type (Des_Btyp) |
10555 | then | |
10556 | -- Ada 2005 (AI-412): If the (sub)type is a limited view of an | |
10557 | -- imported entity, and the non-limited view is visible, make | |
10558 | -- use of it. If it is an incomplete subtype, use the base type | |
10559 | -- in any case. | |
10560 | ||
7b56a91b | 10561 | if From_Limited_With (Des_Btyp) |
7b76e805 RD |
10562 | and then Present (Non_Limited_View (Des_Btyp)) |
10563 | then | |
10564 | Des_Btyp := Non_Limited_View (Des_Btyp); | |
10565 | ||
10566 | elsif Ekind (Des_Btyp) = E_Incomplete_Subtype then | |
10567 | Des_Btyp := Etype (Des_Btyp); | |
10568 | end if; | |
10569 | end if; | |
10570 | ||
996ae0b0 RK |
10571 | if (Attr_Id = Attribute_Access |
10572 | or else | |
10573 | Attr_Id = Attribute_Unchecked_Access) | |
10574 | and then (Ekind (Btyp) = E_General_Access_Type | |
b07b7ace | 10575 | or else Ekind (Btyp) = E_Anonymous_Access_Type) |
996ae0b0 | 10576 | then |
0ab80019 | 10577 | -- Ada 2005 (AI-230): Check the accessibility of anonymous |
822033eb HK |
10578 | -- access types for stand-alone objects, record and array |
10579 | -- components, and return objects. For a component definition | |
10580 | -- the level is the same of the enclosing composite type. | |
35b7fa6a | 10581 | |
0791fbe9 | 10582 | if Ada_Version >= Ada_2005 |
d15f9422 AC |
10583 | and then (Is_Local_Anonymous_Access (Btyp) |
10584 | ||
011f9d5d AC |
10585 | -- Handle cases where Btyp is the anonymous access |
10586 | -- type of an Ada 2012 stand-alone object. | |
d15f9422 | 10587 | |
996c8821 RD |
10588 | or else Nkind (Associated_Node_For_Itype (Btyp)) = |
10589 | N_Object_Declaration) | |
011f9d5d AC |
10590 | and then |
10591 | Object_Access_Level (P) > Deepest_Type_Access_Level (Btyp) | |
468c6c8a | 10592 | and then Attr_Id = Attribute_Access |
35b7fa6a | 10593 | then |
ef1c0511 AC |
10594 | -- In an instance, this is a runtime check, but one we know |
10595 | -- will fail, so generate an appropriate warning. As usual, | |
10596 | -- this kind of warning is an error in SPARK mode. | |
35b7fa6a AC |
10597 | |
10598 | if In_Instance_Body then | |
43417b90 | 10599 | Error_Msg_Warn := SPARK_Mode /= On; |
822033eb | 10600 | Error_Msg_F |
4a28b181 AC |
10601 | ("non-local pointer cannot point to local object<<", P); |
10602 | Error_Msg_F ("\Program_Error [<<", P); | |
10603 | ||
35b7fa6a AC |
10604 | Rewrite (N, |
10605 | Make_Raise_Program_Error (Loc, | |
10606 | Reason => PE_Accessibility_Check_Failed)); | |
10607 | Set_Etype (N, Typ); | |
822033eb | 10608 | |
35b7fa6a | 10609 | else |
822033eb | 10610 | Error_Msg_F |
35b7fa6a AC |
10611 | ("non-local pointer cannot point to local object", P); |
10612 | end if; | |
10613 | end if; | |
10614 | ||
996ae0b0 | 10615 | if Is_Dependent_Component_Of_Mutable_Object (P) then |
822033eb | 10616 | Error_Msg_F |
996ae0b0 RK |
10617 | ("illegal attribute for discriminant-dependent component", |
10618 | P); | |
10619 | end if; | |
10620 | ||
442ade9d RD |
10621 | -- Check static matching rule of 3.10.2(27). Nominal subtype |
10622 | -- of the prefix must statically match the designated type. | |
996ae0b0 RK |
10623 | |
10624 | Nom_Subt := Etype (P); | |
10625 | ||
10626 | if Is_Constr_Subt_For_U_Nominal (Nom_Subt) then | |
822033eb | 10627 | Nom_Subt := Base_Type (Nom_Subt); |
996ae0b0 RK |
10628 | end if; |
10629 | ||
10630 | if Is_Tagged_Type (Designated_Type (Typ)) then | |
32213142 | 10631 | |
996ae0b0 | 10632 | -- If the attribute is in the context of an access |
3f1bc2cf AC |
10633 | -- parameter, then the prefix is allowed to be of |
10634 | -- the class-wide type (by AI-127). | |
996ae0b0 RK |
10635 | |
10636 | if Ekind (Typ) = E_Anonymous_Access_Type then | |
10637 | if not Covers (Designated_Type (Typ), Nom_Subt) | |
10638 | and then not Covers (Nom_Subt, Designated_Type (Typ)) | |
10639 | then | |
ee0a48c5 ES |
10640 | declare |
10641 | Desig : Entity_Id; | |
10642 | ||
10643 | begin | |
10644 | Desig := Designated_Type (Typ); | |
10645 | ||
10646 | if Is_Class_Wide_Type (Desig) then | |
10647 | Desig := Etype (Desig); | |
10648 | end if; | |
10649 | ||
10650 | if Is_Anonymous_Tagged_Base (Nom_Subt, Desig) then | |
10651 | null; | |
10652 | ||
10653 | else | |
822033eb | 10654 | Error_Msg_FE |
ee0a48c5 ES |
10655 | ("type of prefix: & not compatible", |
10656 | P, Nom_Subt); | |
822033eb | 10657 | Error_Msg_FE |
ee0a48c5 ES |
10658 | ("\with &, the expected designated type", |
10659 | P, Designated_Type (Typ)); | |
10660 | end if; | |
10661 | end; | |
996ae0b0 RK |
10662 | end if; |
10663 | ||
10664 | elsif not Covers (Designated_Type (Typ), Nom_Subt) | |
10665 | or else | |
10666 | (not Is_Class_Wide_Type (Designated_Type (Typ)) | |
10667 | and then Is_Class_Wide_Type (Nom_Subt)) | |
10668 | then | |
822033eb | 10669 | Error_Msg_FE |
996ae0b0 | 10670 | ("type of prefix: & is not covered", P, Nom_Subt); |
822033eb | 10671 | Error_Msg_FE |
996ae0b0 | 10672 | ("\by &, the expected designated type" & |
442ade9d | 10673 | " (RM 3.10.2 (27))", P, Designated_Type (Typ)); |
996ae0b0 RK |
10674 | end if; |
10675 | ||
10676 | if Is_Class_Wide_Type (Designated_Type (Typ)) | |
10677 | and then Has_Discriminants (Etype (Designated_Type (Typ))) | |
10678 | and then Is_Constrained (Etype (Designated_Type (Typ))) | |
10679 | and then Designated_Type (Typ) /= Nom_Subt | |
10680 | then | |
10681 | Apply_Discriminant_Check | |
10682 | (N, Etype (Designated_Type (Typ))); | |
10683 | end if; | |
10684 | ||
468c6c8a ES |
10685 | -- Ada 2005 (AI-363): Require static matching when designated |
10686 | -- type has discriminants and a constrained partial view, since | |
10687 | -- in general objects of such types are mutable, so we can't | |
10688 | -- allow the access value to designate a constrained object | |
10689 | -- (because access values must be assumed to designate mutable | |
10690 | -- objects when designated type does not impose a constraint). | |
10691 | ||
7b76e805 RD |
10692 | elsif Subtypes_Statically_Match (Des_Btyp, Nom_Subt) then |
10693 | null; | |
10694 | ||
10695 | elsif Has_Discriminants (Designated_Type (Typ)) | |
10696 | and then not Is_Constrained (Des_Btyp) | |
996ae0b0 | 10697 | and then |
0791fbe9 | 10698 | (Ada_Version < Ada_2005 |
7b76e805 | 10699 | or else |
0fbcb11c | 10700 | not Object_Type_Has_Constrained_Partial_View |
d600ef16 RD |
10701 | (Typ => Designated_Type (Base_Type (Typ)), |
10702 | Scop => Current_Scope)) | |
996ae0b0 | 10703 | then |
7b76e805 RD |
10704 | null; |
10705 | ||
10706 | else | |
822033eb | 10707 | Error_Msg_F |
996ae0b0 RK |
10708 | ("object subtype must statically match " |
10709 | & "designated subtype", P); | |
10710 | ||
10711 | if Is_Entity_Name (P) | |
10712 | and then Is_Array_Type (Designated_Type (Typ)) | |
10713 | then | |
996ae0b0 RK |
10714 | declare |
10715 | D : constant Node_Id := Declaration_Node (Entity (P)); | |
996ae0b0 | 10716 | begin |
324ac540 AC |
10717 | Error_Msg_N |
10718 | ("aliased object has explicit bounds??", D); | |
10719 | Error_Msg_N | |
10720 | ("\declare without bounds (and with explicit " | |
10721 | & "initialization)??", D); | |
10722 | Error_Msg_N | |
10723 | ("\for use with unconstrained access??", D); | |
996ae0b0 RK |
10724 | end; |
10725 | end if; | |
10726 | end if; | |
10727 | ||
83e5da69 AC |
10728 | -- Check the static accessibility rule of 3.10.2(28). Note that |
10729 | -- this check is not performed for the case of an anonymous | |
10730 | -- access type, since the access attribute is always legal | |
10731 | -- in such a context. | |
996ae0b0 RK |
10732 | |
10733 | if Attr_Id /= Attribute_Unchecked_Access | |
a7e68e7f | 10734 | and then Ekind (Btyp) = E_General_Access_Type |
f460d8f3 SB |
10735 | and then |
10736 | Object_Access_Level (P) > Deepest_Type_Access_Level (Btyp) | |
996ae0b0 | 10737 | then |
f529bac5 ES |
10738 | Accessibility_Message; |
10739 | return; | |
996ae0b0 RK |
10740 | end if; |
10741 | end if; | |
10742 | ||
e1b871e9 AC |
10743 | if Ekind_In (Btyp, E_Access_Protected_Subprogram_Type, |
10744 | E_Anonymous_Access_Protected_Subprogram_Type) | |
996ae0b0 | 10745 | then |
f529bac5 ES |
10746 | if Is_Entity_Name (P) |
10747 | and then not Is_Protected_Type (Scope (Entity (P))) | |
10748 | then | |
822033eb | 10749 | Error_Msg_F ("context requires a protected subprogram", P); |
f529bac5 | 10750 | |
442ade9d RD |
10751 | -- Check accessibility of protected object against that of the |
10752 | -- access type, but only on user code, because the expander | |
10753 | -- creates access references for handlers. If the context is an | |
10754 | -- anonymous_access_to_protected, there are no accessibility | |
10755 | -- checks either. Omit check entirely for Unrestricted_Access. | |
f529bac5 | 10756 | |
f460d8f3 | 10757 | elsif Object_Access_Level (P) > Deepest_Type_Access_Level (Btyp) |
f529bac5 ES |
10758 | and then Comes_From_Source (N) |
10759 | and then Ekind (Btyp) = E_Access_Protected_Subprogram_Type | |
822033eb | 10760 | and then Attr_Id /= Attribute_Unrestricted_Access |
f529bac5 ES |
10761 | then |
10762 | Accessibility_Message; | |
10763 | return; | |
c92e8586 AC |
10764 | |
10765 | -- AI05-0225: If the context is not an access to protected | |
10766 | -- function, the prefix must be a variable, given that it may | |
10767 | -- be used subsequently in a protected call. | |
10768 | ||
10769 | elsif Nkind (P) = N_Selected_Component | |
10770 | and then not Is_Variable (Prefix (P)) | |
10771 | and then Ekind (Entity (Selector_Name (P))) /= E_Function | |
10772 | then | |
10773 | Error_Msg_N | |
10774 | ("target object of access to protected procedure " | |
10775 | & "must be variable", N); | |
10776 | ||
10777 | elsif Is_Entity_Name (P) then | |
10778 | Check_Internal_Protected_Use (N, Entity (P)); | |
f529bac5 | 10779 | end if; |
996ae0b0 | 10780 | |
e1b871e9 AC |
10781 | elsif Ekind_In (Btyp, E_Access_Subprogram_Type, |
10782 | E_Anonymous_Access_Subprogram_Type) | |
996ae0b0 RK |
10783 | and then Ekind (Etype (N)) = E_Access_Protected_Subprogram_Type |
10784 | then | |
822033eb | 10785 | Error_Msg_F ("context requires a non-protected subprogram", P); |
996ae0b0 RK |
10786 | end if; |
10787 | ||
10788 | -- The context cannot be a pool-specific type, but this is a | |
10789 | -- legality rule, not a resolution rule, so it must be checked | |
10790 | -- separately, after possibly disambiguation (see AI-245). | |
10791 | ||
10792 | if Ekind (Btyp) = E_Access_Type | |
10793 | and then Attr_Id /= Attribute_Unrestricted_Access | |
10794 | then | |
10795 | Wrong_Type (N, Typ); | |
10796 | end if; | |
10797 | ||
822033eb HK |
10798 | -- The context may be a constrained access type (however ill- |
10799 | -- advised such subtypes might be) so in order to generate a | |
10800 | -- constraint check when needed set the type of the attribute | |
10801 | -- reference to the base type of the context. | |
10802 | ||
10803 | Set_Etype (N, Btyp); | |
996ae0b0 RK |
10804 | |
10805 | -- Check for incorrect atomic/volatile reference (RM C.6(12)) | |
10806 | ||
10807 | if Attr_Id /= Attribute_Unrestricted_Access then | |
10808 | if Is_Atomic_Object (P) | |
10809 | and then not Is_Atomic (Designated_Type (Typ)) | |
10810 | then | |
822033eb | 10811 | Error_Msg_F |
996ae0b0 RK |
10812 | ("access to atomic object cannot yield access-to-" & |
10813 | "non-atomic type", P); | |
10814 | ||
10815 | elsif Is_Volatile_Object (P) | |
10816 | and then not Is_Volatile (Designated_Type (Typ)) | |
10817 | then | |
822033eb | 10818 | Error_Msg_F |
996ae0b0 RK |
10819 | ("access to volatile object cannot yield access-to-" & |
10820 | "non-volatile type", P); | |
10821 | end if; | |
10822 | end if; | |
10823 | ||
b07b7ace AC |
10824 | -- Check for unrestricted access where expected type is a thin |
10825 | -- pointer to an unconstrained array. | |
10826 | ||
10827 | if Non_Aliased_Prefix (N) | |
10828 | and then Has_Size_Clause (Typ) | |
10829 | and then RM_Size (Typ) = System_Address_Size | |
10830 | then | |
10831 | declare | |
10832 | DT : constant Entity_Id := Designated_Type (Typ); | |
10833 | begin | |
10834 | if Is_Array_Type (DT) and then not Is_Constrained (DT) then | |
10835 | Error_Msg_N | |
10836 | ("illegal use of Unrestricted_Access attribute", P); | |
10837 | Error_Msg_N | |
10838 | ("\attempt to generate thin pointer to unaliased " | |
10839 | & "object", P); | |
10840 | end if; | |
10841 | end; | |
10842 | end if; | |
10843 | ||
10844 | -- Mark that address of entity is taken | |
10845 | ||
442ade9d RD |
10846 | if Is_Entity_Name (P) then |
10847 | Set_Address_Taken (Entity (P)); | |
10848 | end if; | |
113a9fb6 | 10849 | |
b8e6830b AC |
10850 | -- Deal with possible elaboration check |
10851 | ||
10852 | if Is_Entity_Name (P) and then Is_Subprogram (Entity (P)) then | |
113a9fb6 | 10853 | declare |
b8e6830b AC |
10854 | Subp_Id : constant Entity_Id := Entity (P); |
10855 | Scop : constant Entity_Id := Scope (Subp_Id); | |
10856 | Subp_Decl : constant Node_Id := | |
10857 | Unit_Declaration_Node (Subp_Id); | |
8c691dc6 AC |
10858 | Flag_Id : Entity_Id; |
10859 | Subp_Body : Node_Id; | |
113a9fb6 AC |
10860 | |
10861 | -- If the access has been taken and the body of the subprogram | |
10862 | -- has not been see yet, indirect calls must be protected with | |
10863 | -- elaboration checks. We have the proper elaboration machinery | |
10864 | -- for subprograms declared in packages, but within a block or | |
10865 | -- a subprogram the body will appear in the same declarative | |
10866 | -- part, and we must insert a check in the eventual body itself | |
10867 | -- using the elaboration flag that we generate now. The check | |
b8e6830b AC |
10868 | -- is then inserted when the body is expanded. This processing |
10869 | -- is not needed for a stand alone expression function because | |
10870 | -- the internally generated spec and body are always inserted | |
10871 | -- as a pair in the same declarative list. | |
113a9fb6 AC |
10872 | |
10873 | begin | |
b8e6830b AC |
10874 | if Expander_Active |
10875 | and then Comes_From_Source (Subp_Id) | |
113a9fb6 | 10876 | and then Comes_From_Source (N) |
b8e6830b AC |
10877 | and then In_Open_Scopes (Scop) |
10878 | and then Ekind_In (Scop, E_Block, E_Procedure, E_Function) | |
10879 | and then not Has_Completion (Subp_Id) | |
10880 | and then No (Elaboration_Entity (Subp_Id)) | |
10881 | and then Nkind (Subp_Decl) = N_Subprogram_Declaration | |
10882 | and then Nkind (Original_Node (Subp_Decl)) /= | |
10883 | N_Expression_Function | |
113a9fb6 AC |
10884 | then |
10885 | -- Create elaboration variable for it | |
10886 | ||
b8e6830b AC |
10887 | Flag_Id := Make_Temporary (Loc, 'E'); |
10888 | Set_Elaboration_Entity (Subp_Id, Flag_Id); | |
10889 | Set_Is_Frozen (Flag_Id); | |
10890 | ||
10891 | -- Insert declaration for flag after subprogram | |
10892 | -- declaration. Note that attribute reference may | |
10893 | -- appear within a nested scope. | |
10894 | ||
10895 | Insert_After_And_Analyze (Subp_Decl, | |
113a9fb6 | 10896 | Make_Object_Declaration (Loc, |
b8e6830b | 10897 | Defining_Identifier => Flag_Id, |
113a9fb6 AC |
10898 | Object_Definition => |
10899 | New_Occurrence_Of (Standard_Short_Integer, Loc), | |
10900 | Expression => | |
b8e6830b AC |
10901 | Make_Integer_Literal (Loc, Uint_0))); |
10902 | end if; | |
f9e333ab | 10903 | |
b8e6830b AC |
10904 | -- Taking the 'Access of an expression function freezes its |
10905 | -- expression (RM 13.14 10.3/3). This does not apply to an | |
10906 | -- expression function that acts as a completion because the | |
10907 | -- generated body is immediately analyzed and the expression | |
10908 | -- is automatically frozen. | |
10909 | ||
8c691dc6 | 10910 | if Is_Expression_Function (Subp_Id) |
b8e6830b | 10911 | and then Present (Corresponding_Body (Subp_Decl)) |
b8e6830b | 10912 | then |
8c691dc6 AC |
10913 | Subp_Body := |
10914 | Unit_Declaration_Node (Corresponding_Body (Subp_Decl)); | |
b8e6830b | 10915 | |
8d1fe980 AC |
10916 | -- The body has already been analyzed when the expression |
10917 | -- function acts as a completion. | |
f9e333ab | 10918 | |
8d1fe980 AC |
10919 | if Analyzed (Subp_Body) then |
10920 | null; | |
10921 | ||
10922 | -- Attribute 'Access may appear within the generated body | |
10923 | -- of the expression function subject to the attribute: | |
10924 | ||
10925 | -- function F is (... F'Access ...); | |
10926 | ||
10927 | -- If the expression function is on the scope stack, then | |
10928 | -- the body is currently being analyzed. Do not reanalyze | |
10929 | -- it because this will lead to infinite recursion. | |
10930 | ||
10931 | elsif In_Open_Scopes (Subp_Id) then | |
10932 | null; | |
10933 | ||
72d5c70b AC |
10934 | -- If reference to the expression function appears in an |
10935 | -- inner scope, for example as an actual in an instance, | |
10936 | -- this is not a freeze point either. | |
10937 | ||
10938 | elsif Scope (Subp_Id) /= Current_Scope then | |
10939 | null; | |
10940 | ||
8d1fe980 AC |
10941 | -- Analyze the body of the expression function to freeze |
10942 | -- the expression. This takes care of the case where the | |
10943 | -- 'Access is part of dispatch table initialization and | |
10944 | -- the generated body of the expression function has not | |
10945 | -- been analyzed yet. | |
10946 | ||
10947 | else | |
8c691dc6 | 10948 | Analyze (Subp_Body); |
b8e6830b | 10949 | end if; |
113a9fb6 AC |
10950 | end if; |
10951 | end; | |
10952 | end if; | |
442ade9d RD |
10953 | end Access_Attribute; |
10954 | ||
996ae0b0 RK |
10955 | ------------- |
10956 | -- Address -- | |
10957 | ------------- | |
10958 | ||
10959 | -- Deal with resolving the type for Address attribute, overloading | |
10960 | -- is not permitted here, since there is no context to resolve it. | |
10961 | ||
10962 | when Attribute_Address | Attribute_Code_Address => | |
442ade9d | 10963 | Address_Attribute : begin |
996ae0b0 RK |
10964 | |
10965 | -- To be safe, assume that if the address of a variable is taken, | |
10966 | -- it may be modified via this address, so note modification. | |
10967 | ||
10968 | if Is_Variable (P) then | |
21d27997 | 10969 | Note_Possible_Modification (P, Sure => False); |
996ae0b0 RK |
10970 | end if; |
10971 | ||
c4e5e10f | 10972 | if Nkind (P) in N_Subexpr |
996ae0b0 RK |
10973 | and then Is_Overloaded (P) |
10974 | then | |
10975 | Get_First_Interp (P, Index, It); | |
10976 | Get_Next_Interp (Index, It); | |
10977 | ||
10978 | if Present (It.Nam) then | |
10979 | Error_Msg_Name_1 := Aname; | |
822033eb | 10980 | Error_Msg_F |
c4e5e10f | 10981 | ("prefix of % attribute cannot be overloaded", P); |
996ae0b0 RK |
10982 | end if; |
10983 | end if; | |
10984 | ||
996ae0b0 | 10985 | if not Is_Entity_Name (P) |
442ade9d | 10986 | or else not Is_Overloadable (Entity (P)) |
996ae0b0 RK |
10987 | then |
10988 | if not Is_Task_Type (Etype (P)) | |
10989 | or else Nkind (P) = N_Explicit_Dereference | |
10990 | then | |
fbf5a39b | 10991 | Resolve (P); |
996ae0b0 RK |
10992 | end if; |
10993 | end if; | |
10994 | ||
10995 | -- If this is the name of a derived subprogram, or that of a | |
10996 | -- generic actual, the address is that of the original entity. | |
10997 | ||
10998 | if Is_Entity_Name (P) | |
10999 | and then Is_Overloadable (Entity (P)) | |
11000 | and then Present (Alias (Entity (P))) | |
11001 | then | |
11002 | Rewrite (P, | |
11003 | New_Occurrence_Of (Alias (Entity (P)), Sloc (P))); | |
11004 | end if; | |
11005 | ||
442ade9d RD |
11006 | if Is_Entity_Name (P) then |
11007 | Set_Address_Taken (Entity (P)); | |
11008 | end if; | |
bfc157d5 ES |
11009 | |
11010 | if Nkind (P) = N_Slice then | |
11011 | ||
11012 | -- Arr (X .. Y)'address is identical to Arr (X)'address, | |
11013 | -- even if the array is packed and the slice itself is not | |
11014 | -- addressable. Transform the prefix into an indexed component. | |
edde779b | 11015 | |
a66996b3 | 11016 | -- Note that the transformation is safe only if we know that |
edde779b AC |
11017 | -- the slice is non-null. That is because a null slice can have |
11018 | -- an out of bounds index value. | |
11019 | ||
4c4e9ad2 ES |
11020 | -- Right now, gigi blows up if given 'Address on a slice as a |
11021 | -- result of some incorrect freeze nodes generated by the front | |
11022 | -- end, and this covers up that bug in one case, but the bug is | |
11023 | -- likely still there in the cases not handled by this code ??? | |
edde779b AC |
11024 | |
11025 | -- It's not clear what 'Address *should* return for a null | |
11026 | -- slice with out of bounds indexes, this might be worth an ARG | |
11027 | -- discussion ??? | |
11028 | ||
11029 | -- One approach would be to do a length check unconditionally, | |
11030 | -- and then do the transformation below unconditionally, but | |
11031 | -- analyze with checks off, avoiding the problem of the out of | |
11032 | -- bounds index. This approach would interpret the address of | |
11033 | -- an out of bounds null slice as being the address where the | |
11034 | -- array element would be if there was one, which is probably | |
11035 | -- as reasonable an interpretation as any ??? | |
bfc157d5 ES |
11036 | |
11037 | declare | |
11038 | Loc : constant Source_Ptr := Sloc (P); | |
11039 | D : constant Node_Id := Discrete_Range (P); | |
11040 | Lo : Node_Id; | |
11041 | ||
11042 | begin | |
a66996b3 ES |
11043 | if Is_Entity_Name (D) |
11044 | and then | |
11045 | Not_Null_Range | |
11046 | (Type_Low_Bound (Entity (D)), | |
11047 | Type_High_Bound (Entity (D))) | |
11048 | then | |
bfc157d5 ES |
11049 | Lo := |
11050 | Make_Attribute_Reference (Loc, | |
11051 | Prefix => (New_Occurrence_Of (Entity (D), Loc)), | |
11052 | Attribute_Name => Name_First); | |
a66996b3 | 11053 | |
4c4e9ad2 ES |
11054 | elsif Nkind (D) = N_Range |
11055 | and then Not_Null_Range (Low_Bound (D), High_Bound (D)) | |
11056 | then | |
bfc157d5 | 11057 | Lo := Low_Bound (D); |
a66996b3 ES |
11058 | |
11059 | else | |
11060 | Lo := Empty; | |
bfc157d5 ES |
11061 | end if; |
11062 | ||
a66996b3 ES |
11063 | if Present (Lo) then |
11064 | Rewrite (P, | |
11065 | Make_Indexed_Component (Loc, | |
11066 | Prefix => Relocate_Node (Prefix (P)), | |
11067 | Expressions => New_List (Lo))); | |
bfc157d5 | 11068 | |
a66996b3 ES |
11069 | Analyze_And_Resolve (P); |
11070 | end if; | |
bfc157d5 ES |
11071 | end; |
11072 | end if; | |
442ade9d RD |
11073 | end Address_Attribute; |
11074 | ||
996ae0b0 RK |
11075 | ------------------ |
11076 | -- Body_Version -- | |
11077 | ------------------ | |
11078 | ||
11079 | -- Prefix of Body_Version attribute can be a subprogram name which | |
11080 | -- must not be resolved, since this is not a call. | |
11081 | ||
11082 | when Attribute_Body_Version => | |
11083 | null; | |
11084 | ||
11085 | ------------ | |
11086 | -- Caller -- | |
11087 | ------------ | |
11088 | ||
11089 | -- Prefix of Caller attribute is an entry name which must not | |
11090 | -- be resolved, since this is definitely not an entry call. | |
11091 | ||
11092 | when Attribute_Caller => | |
11093 | null; | |
11094 | ||
11095 | ------------------ | |
11096 | -- Code_Address -- | |
11097 | ------------------ | |
11098 | ||
11099 | -- Shares processing with Address attribute | |
11100 | ||
11101 | ----------- | |
11102 | -- Count -- | |
11103 | ----------- | |
11104 | ||
fbf5a39b AC |
11105 | -- If the prefix of the Count attribute is an entry name it must not |
11106 | -- be resolved, since this is definitely not an entry call. However, | |
11107 | -- if it is an element of an entry family, the index itself may | |
11108 | -- have to be resolved because it can be a general expression. | |
996ae0b0 RK |
11109 | |
11110 | when Attribute_Count => | |
fbf5a39b AC |
11111 | if Nkind (P) = N_Indexed_Component |
11112 | and then Is_Entity_Name (Prefix (P)) | |
11113 | then | |
11114 | declare | |
11115 | Indx : constant Node_Id := First (Expressions (P)); | |
11116 | Fam : constant Entity_Id := Entity (Prefix (P)); | |
11117 | begin | |
11118 | Resolve (Indx, Entry_Index_Type (Fam)); | |
11119 | Apply_Range_Check (Indx, Entry_Index_Type (Fam)); | |
11120 | end; | |
11121 | end if; | |
996ae0b0 RK |
11122 | |
11123 | ---------------- | |
11124 | -- Elaborated -- | |
11125 | ---------------- | |
11126 | ||
11127 | -- Prefix of the Elaborated attribute is a subprogram name which | |
11128 | -- must not be resolved, since this is definitely not a call. Note | |
11129 | -- that it is a library unit, so it cannot be overloaded here. | |
11130 | ||
11131 | when Attribute_Elaborated => | |
11132 | null; | |
11133 | ||
442ade9d RD |
11134 | ------------- |
11135 | -- Enabled -- | |
11136 | ------------- | |
11137 | ||
11138 | -- Prefix of Enabled attribute is a check name, which must be treated | |
11139 | -- specially and not touched by Resolve. | |
11140 | ||
11141 | when Attribute_Enabled => | |
11142 | null; | |
11143 | ||
ba08ba84 AC |
11144 | ---------------- |
11145 | -- Loop_Entry -- | |
11146 | ---------------- | |
11147 | ||
11148 | -- Do not resolve the prefix of Loop_Entry, instead wait until the | |
11149 | -- attribute has been expanded (see Expand_Loop_Entry_Attributes). | |
11150 | -- The delay ensures that any generated checks or temporaries are | |
11151 | -- inserted before the relocated prefix. | |
11152 | ||
11153 | when Attribute_Loop_Entry => | |
11154 | null; | |
11155 | ||
996ae0b0 RK |
11156 | -------------------- |
11157 | -- Mechanism_Code -- | |
11158 | -------------------- | |
11159 | ||
11160 | -- Prefix of the Mechanism_Code attribute is a function name | |
11161 | -- which must not be resolved. Should we check for overloaded ??? | |
11162 | ||
11163 | when Attribute_Mechanism_Code => | |
11164 | null; | |
11165 | ||
11166 | ------------------ | |
11167 | -- Partition_ID -- | |
11168 | ------------------ | |
11169 | ||
11170 | -- Most processing is done in sem_dist, after determining the | |
11171 | -- context type. Node is rewritten as a conversion to a runtime call. | |
11172 | ||
11173 | when Attribute_Partition_ID => | |
11174 | Process_Partition_Id (N); | |
11175 | return; | |
11176 | ||
1033834f RD |
11177 | ------------------ |
11178 | -- Pool_Address -- | |
11179 | ------------------ | |
11180 | ||
fbf5a39b AC |
11181 | when Attribute_Pool_Address => |
11182 | Resolve (P); | |
11183 | ||
996ae0b0 RK |
11184 | ----------- |
11185 | -- Range -- | |
11186 | ----------- | |
11187 | ||
c159409f AC |
11188 | -- We replace the Range attribute node with a range expression whose |
11189 | -- bounds are the 'First and 'Last attributes applied to the same | |
11190 | -- prefix. The reason that we do this transformation here instead of | |
11191 | -- in the expander is that it simplifies other parts of the semantic | |
11192 | -- analysis which assume that the Range has been replaced; thus it | |
11193 | -- must be done even when in semantic-only mode (note that the RM | |
11194 | -- specifically mentions this equivalence, we take care that the | |
11195 | -- prefix is only evaluated once). | |
996ae0b0 RK |
11196 | |
11197 | when Attribute_Range => Range_Attribute : | |
11198 | declare | |
11199 | LB : Node_Id; | |
11200 | HB : Node_Id; | |
ed32b82e | 11201 | Dims : List_Id; |
996ae0b0 | 11202 | |
996ae0b0 RK |
11203 | begin |
11204 | if not Is_Entity_Name (P) | |
11205 | or else not Is_Type (Entity (P)) | |
11206 | then | |
fbf5a39b | 11207 | Resolve (P); |
996ae0b0 RK |
11208 | end if; |
11209 | ||
ed32b82e ES |
11210 | Dims := Expressions (N); |
11211 | ||
21d27997 RD |
11212 | HB := |
11213 | Make_Attribute_Reference (Loc, | |
a1d3851b | 11214 | Prefix => Duplicate_Subexpr (P, Name_Req => True), |
21d27997 | 11215 | Attribute_Name => Name_Last, |
ed32b82e | 11216 | Expressions => Dims); |
996ae0b0 | 11217 | |
21d27997 RD |
11218 | LB := |
11219 | Make_Attribute_Reference (Loc, | |
ed32b82e | 11220 | Prefix => P, |
2c17ca0a AC |
11221 | Attribute_Name => Name_First, |
11222 | Expressions => (Dims)); | |
ed32b82e ES |
11223 | |
11224 | -- Do not share the dimension indicator, if present. Even | |
11225 | -- though it is a static constant, its source location | |
11226 | -- may be modified when printing expanded code and node | |
11227 | -- sharing will lead to chaos in Sprint. | |
11228 | ||
11229 | if Present (Dims) then | |
11230 | Set_Expressions (LB, | |
11231 | New_List (New_Copy_Tree (First (Dims)))); | |
11232 | end if; | |
996ae0b0 RK |
11233 | |
11234 | -- If the original was marked as Must_Not_Freeze (see code | |
11235 | -- in Sem_Ch3.Make_Index), then make sure the rewriting | |
11236 | -- does not freeze either. | |
11237 | ||
11238 | if Must_Not_Freeze (N) then | |
11239 | Set_Must_Not_Freeze (HB); | |
11240 | Set_Must_Not_Freeze (LB); | |
11241 | Set_Must_Not_Freeze (Prefix (HB)); | |
11242 | Set_Must_Not_Freeze (Prefix (LB)); | |
11243 | end if; | |
11244 | ||
11245 | if Raises_Constraint_Error (Prefix (N)) then | |
11246 | ||
11247 | -- Preserve Sloc of prefix in the new bounds, so that | |
11248 | -- the posted warning can be removed if we are within | |
11249 | -- unreachable code. | |
11250 | ||
11251 | Set_Sloc (LB, Sloc (Prefix (N))); | |
11252 | Set_Sloc (HB, Sloc (Prefix (N))); | |
11253 | end if; | |
11254 | ||
11255 | Rewrite (N, Make_Range (Loc, LB, HB)); | |
11256 | Analyze_And_Resolve (N, Typ); | |
11257 | ||
25e29378 AC |
11258 | -- Ensure that the expanded range does not have side effects |
11259 | ||
11260 | Force_Evaluation (LB); | |
11261 | Force_Evaluation (HB); | |
11262 | ||
996ae0b0 RK |
11263 | -- Normally after resolving attribute nodes, Eval_Attribute |
11264 | -- is called to do any possible static evaluation of the node. | |
11265 | -- However, here since the Range attribute has just been | |
11266 | -- transformed into a range expression it is no longer an | |
11267 | -- attribute node and therefore the call needs to be avoided | |
11268 | -- and is accomplished by simply returning from the procedure. | |
11269 | ||
11270 | return; | |
11271 | end Range_Attribute; | |
11272 | ||
21d27997 RD |
11273 | ------------ |
11274 | -- Result -- | |
11275 | ------------ | |
11276 | ||
11277 | -- We will only come here during the prescan of a spec expression | |
11278 | -- containing a Result attribute. In that case the proper Etype has | |
11279 | -- already been set, and nothing more needs to be done here. | |
11280 | ||
11281 | when Attribute_Result => | |
11282 | null; | |
11283 | ||
996ae0b0 RK |
11284 | ---------------------- |
11285 | -- Unchecked_Access -- | |
11286 | ---------------------- | |
11287 | ||
11288 | -- Processing is shared with Access | |
11289 | ||
11290 | ------------------------- | |
11291 | -- Unrestricted_Access -- | |
11292 | ------------------------- | |
11293 | ||
11294 | -- Processing is shared with Access | |
11295 | ||
08cd7c2f AC |
11296 | ------------ |
11297 | -- Update -- | |
11298 | ------------ | |
11299 | ||
11300 | -- Resolve aggregate components in component associations | |
11301 | ||
11302 | when Attribute_Update => | |
11303 | declare | |
11304 | Aggr : constant Node_Id := First (Expressions (N)); | |
11305 | Typ : constant Entity_Id := Etype (Prefix (N)); | |
11306 | Assoc : Node_Id; | |
11307 | Comp : Node_Id; | |
3f433bc0 | 11308 | Expr : Node_Id; |
08cd7c2f AC |
11309 | |
11310 | begin | |
11311 | -- Set the Etype of the aggregate to that of the prefix, even | |
11312 | -- though the aggregate may not be a proper representation of a | |
11313 | -- value of the type (missing or duplicated associations, etc.) | |
f1bd0415 AC |
11314 | -- Complete resolution of the prefix. Note that in Ada 2012 it |
11315 | -- can be a qualified expression that is e.g. an aggregate. | |
08cd7c2f AC |
11316 | |
11317 | Set_Etype (Aggr, Typ); | |
f1bd0415 | 11318 | Resolve (Prefix (N), Typ); |
08cd7c2f AC |
11319 | |
11320 | -- For an array type, resolve expressions with the component | |
3f433bc0 | 11321 | -- type of the array, and apply constraint checks when needed. |
08cd7c2f AC |
11322 | |
11323 | if Is_Array_Type (Typ) then | |
11324 | Assoc := First (Component_Associations (Aggr)); | |
11325 | while Present (Assoc) loop | |
cc6f5d75 | 11326 | Expr := Expression (Assoc); |
3f433bc0 | 11327 | Resolve (Expr, Component_Type (Typ)); |
414c6563 AC |
11328 | |
11329 | -- For scalar array components set Do_Range_Check when | |
11330 | -- needed. Constraint checking on non-scalar components | |
11331 | -- is done in Aggregate_Constraint_Checks, but only if | |
11332 | -- full analysis is enabled. These flags are not set in | |
11333 | -- the front-end in GnatProve mode. | |
11334 | ||
11335 | if Is_Scalar_Type (Component_Type (Typ)) | |
11336 | and then not Is_OK_Static_Expression (Expr) | |
11337 | then | |
11338 | if Is_Entity_Name (Expr) | |
11339 | and then Etype (Expr) = Component_Type (Typ) | |
11340 | then | |
11341 | null; | |
11342 | ||
11343 | else | |
11344 | Set_Do_Range_Check (Expr); | |
11345 | end if; | |
11346 | end if; | |
3f1bc2cf AC |
11347 | |
11348 | -- The choices in the association are static constants, | |
11349 | -- or static aggregates each of whose components belongs | |
11350 | -- to the proper index type. However, they must also | |
11351 | -- belong to the index subtype (s) of the prefix, which | |
11352 | -- may be a subtype (e.g. given by a slice). | |
11353 | ||
11354 | -- Choices may also be identifiers with no staticness | |
b3b26ace AC |
11355 | -- requirements, in which case they must resolve to the |
11356 | -- index type. | |
3f1bc2cf AC |
11357 | |
11358 | declare | |
11359 | C : Node_Id; | |
11360 | C_E : Node_Id; | |
11361 | Indx : Node_Id; | |
11362 | ||
11363 | begin | |
11364 | C := First (Choices (Assoc)); | |
11365 | while Present (C) loop | |
11366 | Indx := First_Index (Etype (Prefix (N))); | |
11367 | ||
11368 | if Nkind (C) /= N_Aggregate then | |
b3b26ace AC |
11369 | Analyze_And_Resolve (C, Etype (Indx)); |
11370 | Apply_Constraint_Check (C, Etype (Indx)); | |
3f1bc2cf AC |
11371 | Check_Non_Static_Context (C); |
11372 | ||
11373 | else | |
11374 | C_E := First (Expressions (C)); | |
11375 | while Present (C_E) loop | |
b3b26ace AC |
11376 | Analyze_And_Resolve (C_E, Etype (Indx)); |
11377 | Apply_Constraint_Check (C_E, Etype (Indx)); | |
3f1bc2cf | 11378 | Check_Non_Static_Context (C_E); |
b3b26ace | 11379 | |
3f1bc2cf AC |
11380 | Next (C_E); |
11381 | Next_Index (Indx); | |
11382 | end loop; | |
11383 | end if; | |
11384 | ||
11385 | Next (C); | |
11386 | end loop; | |
11387 | end; | |
11388 | ||
08cd7c2f AC |
11389 | Next (Assoc); |
11390 | end loop; | |
11391 | ||
11392 | -- For a record type, use type of each component, which is | |
11393 | -- recorded during analysis. | |
11394 | ||
11395 | else | |
11396 | Assoc := First (Component_Associations (Aggr)); | |
11397 | while Present (Assoc) loop | |
11398 | Comp := First (Choices (Assoc)); | |
33b87152 | 11399 | Expr := Expression (Assoc); |
3f1bc2cf | 11400 | |
08cd7c2f AC |
11401 | if Nkind (Comp) /= N_Others_Choice |
11402 | and then not Error_Posted (Comp) | |
11403 | then | |
33b87152 AC |
11404 | Resolve (Expr, Etype (Entity (Comp))); |
11405 | ||
11406 | if Is_Scalar_Type (Etype (Entity (Comp))) | |
11407 | and then not Is_OK_Static_Expression (Expr) | |
11408 | then | |
11409 | Set_Do_Range_Check (Expr); | |
11410 | end if; | |
08cd7c2f | 11411 | end if; |
3f1bc2cf | 11412 | |
08cd7c2f AC |
11413 | Next (Assoc); |
11414 | end loop; | |
11415 | end if; | |
11416 | end; | |
11417 | ||
996ae0b0 RK |
11418 | --------- |
11419 | -- Val -- | |
11420 | --------- | |
11421 | ||
11422 | -- Apply range check. Note that we did not do this during the | |
11423 | -- analysis phase, since we wanted Eval_Attribute to have a | |
11424 | -- chance at finding an illegal out of range value. | |
11425 | ||
11426 | when Attribute_Val => | |
11427 | ||
11428 | -- Note that we do our own Eval_Attribute call here rather than | |
11429 | -- use the common one, because we need to do processing after | |
11430 | -- the call, as per above comment. | |
11431 | ||
11432 | Eval_Attribute (N); | |
11433 | ||
11434 | -- Eval_Attribute may replace the node with a raise CE, or | |
11435 | -- fold it to a constant. Obviously we only apply a scalar | |
a90bd866 | 11436 | -- range check if this did not happen. |
996ae0b0 RK |
11437 | |
11438 | if Nkind (N) = N_Attribute_Reference | |
11439 | and then Attribute_Name (N) = Name_Val | |
11440 | then | |
11441 | Apply_Scalar_Range_Check (First (Expressions (N)), Btyp); | |
11442 | end if; | |
11443 | ||
11444 | return; | |
11445 | ||
11446 | ------------- | |
11447 | -- Version -- | |
11448 | ------------- | |
11449 | ||
11450 | -- Prefix of Version attribute can be a subprogram name which | |
11451 | -- must not be resolved, since this is not a call. | |
11452 | ||
11453 | when Attribute_Version => | |
11454 | null; | |
11455 | ||
11456 | ---------------------- | |
11457 | -- Other Attributes -- | |
11458 | ---------------------- | |
11459 | ||
11460 | -- For other attributes, resolve prefix unless it is a type. If | |
11461 | -- the attribute reference itself is a type name ('Base and 'Class) | |
11462 | -- then this is only legal within a task or protected record. | |
11463 | ||
11464 | when others => | |
59fad002 | 11465 | if not Is_Entity_Name (P) or else not Is_Type (Entity (P)) then |
fbf5a39b | 11466 | Resolve (P); |
996ae0b0 RK |
11467 | end if; |
11468 | ||
11469 | -- If the attribute reference itself is a type name ('Base, | |
11470 | -- 'Class) then this is only legal within a task or protected | |
11471 | -- record. What is this all about ??? | |
11472 | ||
59fad002 | 11473 | if Is_Entity_Name (N) and then Is_Type (Entity (N)) then |
996ae0b0 RK |
11474 | if Is_Concurrent_Type (Entity (N)) |
11475 | and then In_Open_Scopes (Entity (P)) | |
11476 | then | |
11477 | null; | |
11478 | else | |
11479 | Error_Msg_N | |
11480 | ("invalid use of subtype name in expression or call", N); | |
11481 | end if; | |
11482 | end if; | |
11483 | ||
11484 | -- For attributes whose argument may be a string, complete | |
11485 | -- resolution of argument now. This avoids premature expansion | |
11486 | -- (and the creation of transient scopes) before the attribute | |
11487 | -- reference is resolved. | |
11488 | ||
11489 | case Attr_Id is | |
11490 | when Attribute_Value => | |
11491 | Resolve (First (Expressions (N)), Standard_String); | |
11492 | ||
11493 | when Attribute_Wide_Value => | |
11494 | Resolve (First (Expressions (N)), Standard_Wide_String); | |
11495 | ||
82c80734 RD |
11496 | when Attribute_Wide_Wide_Value => |
11497 | Resolve (First (Expressions (N)), Standard_Wide_Wide_String); | |
11498 | ||
996ae0b0 RK |
11499 | when others => null; |
11500 | end case; | |
fea9e956 ES |
11501 | |
11502 | -- If the prefix of the attribute is a class-wide type then it | |
11503 | -- will be expanded into a dispatching call to a predefined | |
11504 | -- primitive. Therefore we must check for potential violation | |
11505 | -- of such restriction. | |
11506 | ||
11507 | if Is_Class_Wide_Type (Etype (P)) then | |
11508 | Check_Restriction (No_Dispatching_Calls, N); | |
11509 | end if; | |
996ae0b0 RK |
11510 | end case; |
11511 | ||
11512 | -- Normally the Freezing is done by Resolve but sometimes the Prefix | |
442ade9d | 11513 | -- is not resolved, in which case the freezing must be done now. |
996ae0b0 | 11514 | |
13fa2acb AC |
11515 | -- For an elaboration check on a subprogram, we do not freeze its type. |
11516 | -- It may be declared in an unrelated scope, in particular in the case | |
11517 | -- of a generic function whose type may remain unelaborated. | |
11518 | ||
11519 | if Attr_Id = Attribute_Elaborated then | |
11520 | null; | |
11521 | ||
11522 | else | |
11523 | Freeze_Expression (P); | |
11524 | end if; | |
996ae0b0 RK |
11525 | |
11526 | -- Finally perform static evaluation on the attribute reference | |
11527 | ||
dec6faf1 | 11528 | Analyze_Dimension (N); |
996ae0b0 | 11529 | Eval_Attribute (N); |
996ae0b0 RK |
11530 | end Resolve_Attribute; |
11531 | ||
f7ea2603 RD |
11532 | ------------------------ |
11533 | -- Set_Boolean_Result -- | |
11534 | ------------------------ | |
11535 | ||
11536 | procedure Set_Boolean_Result (N : Node_Id; B : Boolean) is | |
11537 | Loc : constant Source_Ptr := Sloc (N); | |
f7ea2603 RD |
11538 | begin |
11539 | if B then | |
11540 | Rewrite (N, New_Occurrence_Of (Standard_True, Loc)); | |
11541 | else | |
11542 | Rewrite (N, New_Occurrence_Of (Standard_False, Loc)); | |
11543 | end if; | |
f7ea2603 RD |
11544 | end Set_Boolean_Result; |
11545 | ||
edd63e9b ES |
11546 | -------------------------------- |
11547 | -- Stream_Attribute_Available -- | |
11548 | -------------------------------- | |
11549 | ||
11550 | function Stream_Attribute_Available | |
11551 | (Typ : Entity_Id; | |
11552 | Nam : TSS_Name_Type; | |
11553 | Partial_View : Node_Id := Empty) return Boolean | |
11554 | is | |
11555 | Etyp : Entity_Id := Typ; | |
11556 | ||
edd63e9b ES |
11557 | -- Start of processing for Stream_Attribute_Available |
11558 | ||
11559 | begin | |
11560 | -- We need some comments in this body ??? | |
11561 | ||
468c6c8a | 11562 | if Has_Stream_Attribute_Definition (Typ, Nam) then |
edd63e9b ES |
11563 | return True; |
11564 | end if; | |
11565 | ||
11566 | if Is_Class_Wide_Type (Typ) then | |
11567 | return not Is_Limited_Type (Typ) | |
11568 | or else Stream_Attribute_Available (Etype (Typ), Nam); | |
11569 | end if; | |
11570 | ||
11571 | if Nam = TSS_Stream_Input | |
fea9e956 | 11572 | and then Is_Abstract_Type (Typ) |
edd63e9b ES |
11573 | and then not Is_Class_Wide_Type (Typ) |
11574 | then | |
11575 | return False; | |
11576 | end if; | |
11577 | ||
11578 | if not (Is_Limited_Type (Typ) | |
11579 | or else (Present (Partial_View) | |
11580 | and then Is_Limited_Type (Partial_View))) | |
11581 | then | |
11582 | return True; | |
11583 | end if; | |
11584 | ||
65f01153 RD |
11585 | -- In Ada 2005, Input can invoke Read, and Output can invoke Write |
11586 | ||
11587 | if Nam = TSS_Stream_Input | |
0791fbe9 | 11588 | and then Ada_Version >= Ada_2005 |
65f01153 RD |
11589 | and then Stream_Attribute_Available (Etyp, TSS_Stream_Read) |
11590 | then | |
11591 | return True; | |
11592 | ||
11593 | elsif Nam = TSS_Stream_Output | |
0791fbe9 | 11594 | and then Ada_Version >= Ada_2005 |
65f01153 RD |
11595 | and then Stream_Attribute_Available (Etyp, TSS_Stream_Write) |
11596 | then | |
11597 | return True; | |
edd63e9b ES |
11598 | end if; |
11599 | ||
11600 | -- Case of Read and Write: check for attribute definition clause that | |
11601 | -- applies to an ancestor type. | |
11602 | ||
11603 | while Etype (Etyp) /= Etyp loop | |
11604 | Etyp := Etype (Etyp); | |
11605 | ||
468c6c8a | 11606 | if Has_Stream_Attribute_Definition (Etyp, Nam) then |
edd63e9b ES |
11607 | return True; |
11608 | end if; | |
11609 | end loop; | |
11610 | ||
0791fbe9 | 11611 | if Ada_Version < Ada_2005 then |
edd63e9b ES |
11612 | |
11613 | -- In Ada 95 mode, also consider a non-visible definition | |
11614 | ||
11615 | declare | |
11616 | Btyp : constant Entity_Id := Implementation_Base_Type (Typ); | |
11617 | begin | |
11618 | return Btyp /= Typ | |
11619 | and then Stream_Attribute_Available | |
11620 | (Btyp, Nam, Partial_View => Typ); | |
11621 | end; | |
11622 | end if; | |
11623 | ||
11624 | return False; | |
11625 | end Stream_Attribute_Available; | |
11626 | ||
996ae0b0 | 11627 | end Sem_Attr; |