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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 | -- -- | |
1d005acc | 9 | -- Copyright (C) 1992-2019, 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 | ||
3c08de34 | 28 | with Aspects; use Aspects; |
996ae0b0 | 29 | with Atree; use Atree; |
442ade9d | 30 | with Casing; use Casing; |
996ae0b0 | 31 | with Checks; use Checks; |
967947ed | 32 | with Debug; use Debug; |
996ae0b0 | 33 | with Einfo; use Einfo; |
150ac76e | 34 | with Elists; use Elists; |
996ae0b0 RK |
35 | with Errout; use Errout; |
36 | with Eval_Fat; | |
468c6c8a | 37 | with Exp_Dist; use Exp_Dist; |
996ae0b0 RK |
38 | with Exp_Util; use Exp_Util; |
39 | with Expander; use Expander; | |
40 | with Freeze; use Freeze; | |
e0bf7d65 | 41 | with Gnatvsn; use Gnatvsn; |
e10dab7f | 42 | with Itypes; use Itypes; |
fbf5a39b | 43 | with Lib; use Lib; |
996ae0b0 | 44 | with Lib.Xref; use Lib.Xref; |
996ae0b0 RK |
45 | with Nlists; use Nlists; |
46 | with Nmake; use Nmake; | |
47 | with Opt; use Opt; | |
48 | with Restrict; use Restrict; | |
6e937c1c | 49 | with Rident; use Rident; |
996ae0b0 | 50 | with Rtsfind; use Rtsfind; |
851e9f19 | 51 | with Sdefault; |
996ae0b0 | 52 | with Sem; use Sem; |
a4100e55 | 53 | with Sem_Aux; use Sem_Aux; |
996ae0b0 RK |
54 | with Sem_Cat; use Sem_Cat; |
55 | with Sem_Ch6; use Sem_Ch6; | |
56 | with Sem_Ch8; use Sem_Ch8; | |
c0985d4e | 57 | with Sem_Ch10; use Sem_Ch10; |
dec6faf1 | 58 | with Sem_Dim; use Sem_Dim; |
996ae0b0 | 59 | with Sem_Dist; use Sem_Dist; |
1f163ef7 | 60 | with Sem_Elab; use Sem_Elab; |
16212e89 | 61 | with Sem_Elim; use Sem_Elim; |
996ae0b0 | 62 | with Sem_Eval; use Sem_Eval; |
c9d70ab1 | 63 | with Sem_Prag; use Sem_Prag; |
996ae0b0 RK |
64 | with Sem_Res; use Sem_Res; |
65 | with Sem_Type; use Sem_Type; | |
66 | with Sem_Util; use Sem_Util; | |
71140fc6 | 67 | with Sem_Warn; |
996ae0b0 RK |
68 | with Stand; use Stand; |
69 | with Sinfo; use Sinfo; | |
70 | with Sinput; use Sinput; | |
7ed57189 | 71 | with System; |
996ae0b0 | 72 | with Stringt; use Stringt; |
fea9e956 ES |
73 | with Style; |
74 | with Stylesw; use Stylesw; | |
996ae0b0 RK |
75 | with Targparm; use Targparm; |
76 | with Ttypes; use Ttypes; | |
996ae0b0 RK |
77 | with Tbuild; use Tbuild; |
78 | with Uintp; use Uintp; | |
2cbac6c6 | 79 | with Uname; use Uname; |
996ae0b0 | 80 | with Urealp; use Urealp; |
996ae0b0 | 81 | |
f31dcd99 HK |
82 | with System.CRC32; use System.CRC32; |
83 | ||
996ae0b0 RK |
84 | package body Sem_Attr is |
85 | ||
86 | True_Value : constant Uint := Uint_1; | |
87 | False_Value : constant Uint := Uint_0; | |
88 | -- Synonyms to be used when these constants are used as Boolean values | |
89 | ||
90 | Bad_Attribute : exception; | |
91 | -- Exception raised if an error is detected during attribute processing, | |
92 | -- used so that we can abandon the processing so we don't run into | |
93 | -- trouble with cascaded errors. | |
94 | ||
b8e6830b AC |
95 | -- The following array is the list of attributes defined in the Ada 83 RM. |
96 | -- In Ada 83 mode, these are the only recognized attributes. In other Ada | |
97 | -- modes all these attributes are recognized, even if removed in Ada 95. | |
996ae0b0 | 98 | |
fbf5a39b | 99 | Attribute_83 : constant Attribute_Class_Array := Attribute_Class_Array'( |
155562cb AC |
100 | Attribute_Address | |
101 | Attribute_Aft | | |
102 | Attribute_Alignment | | |
103 | Attribute_Base | | |
104 | Attribute_Callable | | |
105 | Attribute_Constrained | | |
106 | Attribute_Count | | |
107 | Attribute_Delta | | |
108 | Attribute_Digits | | |
109 | Attribute_Emax | | |
110 | Attribute_Epsilon | | |
111 | Attribute_First | | |
112 | Attribute_First_Bit | | |
113 | Attribute_Fore | | |
114 | Attribute_Image | | |
115 | Attribute_Large | | |
116 | Attribute_Last | | |
117 | Attribute_Last_Bit | | |
118 | Attribute_Leading_Part | | |
119 | Attribute_Length | | |
120 | Attribute_Machine_Emax | | |
121 | Attribute_Machine_Emin | | |
122 | Attribute_Machine_Mantissa | | |
123 | Attribute_Machine_Overflows | | |
124 | Attribute_Machine_Radix | | |
125 | Attribute_Machine_Rounds | | |
126 | Attribute_Mantissa | | |
127 | Attribute_Pos | | |
128 | Attribute_Position | | |
129 | Attribute_Pred | | |
130 | Attribute_Range | | |
131 | Attribute_Safe_Emax | | |
132 | Attribute_Safe_Large | | |
133 | Attribute_Safe_Small | | |
134 | Attribute_Size | | |
135 | Attribute_Small | | |
136 | Attribute_Storage_Size | | |
137 | Attribute_Succ | | |
138 | Attribute_Terminated | | |
139 | Attribute_Val | | |
140 | Attribute_Value | | |
141 | Attribute_Width => True, | |
142 | others => False); | |
996ae0b0 | 143 | |
822033eb HK |
144 | -- The following array is the list of attributes defined in the Ada 2005 |
145 | -- RM which are not defined in Ada 95. These are recognized in Ada 95 mode, | |
146 | -- but in Ada 95 they are considered to be implementation defined. | |
147 | ||
148 | Attribute_05 : constant Attribute_Class_Array := Attribute_Class_Array'( | |
155562cb AC |
149 | Attribute_Machine_Rounding | |
150 | Attribute_Mod | | |
151 | Attribute_Priority | | |
152 | Attribute_Stream_Size | | |
153 | Attribute_Wide_Wide_Width => True, | |
154 | others => False); | |
155 | ||
156 | -- The following array is the list of attributes defined in the Ada 2012 | |
157 | -- RM which are not defined in Ada 2005. These are recognized in Ada 95 | |
158 | -- and Ada 2005 modes, but are considered to be implementation defined. | |
159 | ||
160 | Attribute_12 : constant Attribute_Class_Array := Attribute_Class_Array'( | |
161 | Attribute_First_Valid | | |
162 | Attribute_Has_Same_Storage | | |
163 | Attribute_Last_Valid | | |
164 | Attribute_Max_Alignment_For_Allocation => True, | |
165 | others => False); | |
822033eb | 166 | |
442ade9d RD |
167 | -- The following array contains all attributes that imply a modification |
168 | -- of their prefixes or result in an access value. Such prefixes can be | |
169 | -- considered as lvalues. | |
822033eb | 170 | |
442ade9d | 171 | Attribute_Name_Implies_Lvalue_Prefix : constant Attribute_Class_Array := |
822033eb | 172 | Attribute_Class_Array'( |
155562cb AC |
173 | Attribute_Access | |
174 | Attribute_Address | | |
175 | Attribute_Input | | |
176 | Attribute_Read | | |
177 | Attribute_Unchecked_Access | | |
178 | Attribute_Unrestricted_Access => True, | |
179 | others => False); | |
822033eb | 180 | |
996ae0b0 RK |
181 | ----------------------- |
182 | -- Local_Subprograms -- | |
183 | ----------------------- | |
184 | ||
185 | procedure Eval_Attribute (N : Node_Id); | |
186 | -- Performs compile time evaluation of attributes where possible, leaving | |
187 | -- the Is_Static_Expression/Raises_Constraint_Error flags appropriately | |
188 | -- set, and replacing the node with a literal node if the value can be | |
189 | -- computed at compile time. All static attribute references are folded, | |
190 | -- as well as a number of cases of non-static attributes that can always | |
191 | -- be computed at compile time (e.g. floating-point model attributes that | |
192 | -- are applied to non-static subtypes). Of course in such cases, the | |
193 | -- Is_Static_Expression flag will not be set on the resulting literal. | |
194 | -- Note that the only required action of this procedure is to catch the | |
195 | -- static expression cases as described in the RM. Folding of other cases | |
196 | -- is done where convenient, but some additional non-static folding is in | |
97b9064f | 197 | -- Expand_N_Attribute_Reference in cases where this is more convenient. |
996ae0b0 RK |
198 | |
199 | function Is_Anonymous_Tagged_Base | |
200 | (Anon : Entity_Id; | |
155562cb | 201 | Typ : Entity_Id) return Boolean; |
996ae0b0 RK |
202 | -- For derived tagged types that constrain parent discriminants we build |
203 | -- an anonymous unconstrained base type. We need to recognize the relation | |
204 | -- between the two when analyzing an access attribute for a constrained | |
205 | -- component, before the full declaration for Typ has been analyzed, and | |
206 | -- where therefore the prefix of the attribute does not match the enclosing | |
207 | -- scope. | |
208 | ||
f7ea2603 RD |
209 | procedure Set_Boolean_Result (N : Node_Id; B : Boolean); |
210 | -- Rewrites node N with an occurrence of either Standard_False or | |
211 | -- Standard_True, depending on the value of the parameter B. The | |
212 | -- result is marked as a static expression. | |
213 | ||
2df23f66 AC |
214 | function Statically_Denotes_Object (N : Node_Id) return Boolean; |
215 | -- Predicate used to check the legality of the prefix to 'Loop_Entry and | |
216 | -- 'Old, when the prefix is not an entity name. Current RM specfies that | |
217 | -- the prefix must be a direct or expanded name, but it has been proposed | |
218 | -- that the prefix be allowed to be a selected component that does not | |
219 | -- depend on a discriminant, or an indexed component with static indices. | |
220 | -- Current code for this predicate implements this more permissive | |
221 | -- implementation. | |
222 | ||
996ae0b0 RK |
223 | ----------------------- |
224 | -- Analyze_Attribute -- | |
225 | ----------------------- | |
226 | ||
227 | procedure Analyze_Attribute (N : Node_Id) is | |
228 | Loc : constant Source_Ptr := Sloc (N); | |
229 | Aname : constant Name_Id := Attribute_Name (N); | |
230 | P : constant Node_Id := Prefix (N); | |
231 | Exprs : constant List_Id := Expressions (N); | |
232 | Attr_Id : constant Attribute_Id := Get_Attribute_Id (Aname); | |
233 | E1 : Node_Id; | |
234 | E2 : Node_Id; | |
235 | ||
3ec54569 | 236 | P_Type : Entity_Id := Empty; |
996ae0b0 RK |
237 | -- Type of prefix after analysis |
238 | ||
3ec54569 | 239 | P_Base_Type : Entity_Id := Empty; |
996ae0b0 RK |
240 | -- Base type of prefix after analysis |
241 | ||
996ae0b0 RK |
242 | ----------------------- |
243 | -- Local Subprograms -- | |
244 | ----------------------- | |
245 | ||
3cd4a210 AC |
246 | procedure Address_Checks; |
247 | -- Semantic checks for valid use of Address attribute. This was made | |
248 | -- a separate routine with the idea of using it for unrestricted access | |
249 | -- which seems like it should follow the same rules, but that turned | |
250 | -- out to be impractical. So now this is only used for Address. | |
251 | ||
fbf5a39b | 252 | procedure Analyze_Access_Attribute; |
996ae0b0 RK |
253 | -- Used for Access, Unchecked_Access, Unrestricted_Access attributes. |
254 | -- Internally, Id distinguishes which of the three cases is involved. | |
255 | ||
b6a56408 AC |
256 | procedure Analyze_Attribute_Old_Result |
257 | (Legal : out Boolean; | |
258 | Spec_Id : out Entity_Id); | |
259 | -- Common processing for attributes 'Old and 'Result. The routine checks | |
260 | -- that the attribute appears in a postcondition-like aspect or pragma | |
261 | -- associated with a suitable subprogram or a body. Flag Legal is set | |
488f9623 | 262 | -- when the above criteria are met. Spec_Id denotes the entity of the |
b6a56408 AC |
263 | -- subprogram [body] or Empty if the attribute is illegal. |
264 | ||
b276ab7a AC |
265 | procedure Analyze_Image_Attribute (Str_Typ : Entity_Id); |
266 | -- Common processing for attributes 'Img, 'Image, 'Wide_Image, and | |
267 | -- 'Wide_Wide_Image. The routine checks that the prefix is valid and | |
643827e9 | 268 | -- sets the type of the attribute to the one specified by Str_Typ (e.g. |
b276ab7a AC |
269 | -- Standard_String for 'Image and Standard_Wide_String for 'Wide_Image). |
270 | ||
26df19ce AC |
271 | procedure Bad_Attribute_For_Predicate; |
272 | -- Output error message for use of a predicate (First, Last, Range) not | |
273 | -- allowed with a type that has predicates. If the type is a generic | |
274 | -- actual, then the message is a warning, and we generate code to raise | |
86200f66 | 275 | -- program error with an appropriate reason. No error message is given |
011f9d5d AC |
276 | -- for internally generated uses of the attributes. This legality rule |
277 | -- only applies to scalar types. | |
278 | ||
996ae0b0 RK |
279 | procedure Check_Array_Or_Scalar_Type; |
280 | -- Common procedure used by First, Last, Range attribute to check | |
281 | -- that the prefix is a constrained array or scalar type, or a name | |
282 | -- of an array object, and that an argument appears only if appropriate | |
283 | -- (i.e. only in the array case). | |
284 | ||
285 | procedure Check_Array_Type; | |
286 | -- Common semantic checks for all array attributes. Checks that the | |
287 | -- prefix is a constrained array type or the name of an array object. | |
288 | -- The error message for non-arrays is specialized appropriately. | |
289 | ||
290 | procedure Check_Asm_Attribute; | |
291 | -- Common semantic checks for Asm_Input and Asm_Output attributes | |
292 | ||
293 | procedure Check_Component; | |
294 | -- Common processing for Bit_Position, First_Bit, Last_Bit, and | |
295 | -- Position. Checks prefix is an appropriate selected component. | |
296 | ||
297 | procedure Check_Decimal_Fixed_Point_Type; | |
298 | -- Check that prefix of attribute N is a decimal fixed-point type | |
299 | ||
300 | procedure Check_Dereference; | |
301 | -- If the prefix of attribute is an object of an access type, then | |
09494c32 | 302 | -- introduce an explicit dereference, and adjust P_Type accordingly. |
996ae0b0 RK |
303 | |
304 | procedure Check_Discrete_Type; | |
305 | -- Verify that prefix of attribute N is a discrete type | |
306 | ||
307 | procedure Check_E0; | |
308 | -- Check that no attribute arguments are present | |
309 | ||
310 | procedure Check_Either_E0_Or_E1; | |
311 | -- Check that there are zero or one attribute arguments present | |
312 | ||
313 | procedure Check_E1; | |
314 | -- Check that exactly one attribute argument is present | |
315 | ||
316 | procedure Check_E2; | |
317 | -- Check that two attribute arguments are present | |
318 | ||
319 | procedure Check_Enum_Image; | |
4199e8c6 RD |
320 | -- If the prefix type of 'Image is an enumeration type, set all its |
321 | -- literals as referenced, since the image function could possibly end | |
322 | -- up referencing any of the literals indirectly. Same for Enum_Val. | |
8097203f AC |
323 | -- Set the flag only if the reference is in the main code unit. Same |
324 | -- restriction when resolving 'Value; otherwise an improperly set | |
4199e8c6 RD |
325 | -- reference when analyzing an inlined body will lose a proper |
326 | -- warning on a useless with_clause. | |
996ae0b0 | 327 | |
011f9d5d AC |
328 | procedure Check_First_Last_Valid; |
329 | -- Perform all checks for First_Valid and Last_Valid attributes | |
330 | ||
996ae0b0 RK |
331 | procedure Check_Fixed_Point_Type; |
332 | -- Verify that prefix of attribute N is a fixed type | |
333 | ||
334 | procedure Check_Fixed_Point_Type_0; | |
335 | -- Verify that prefix of attribute N is a fixed type and that | |
a4f4dbdb | 336 | -- no attribute expressions are present. |
996ae0b0 RK |
337 | |
338 | procedure Check_Floating_Point_Type; | |
339 | -- Verify that prefix of attribute N is a float type | |
340 | ||
341 | procedure Check_Floating_Point_Type_0; | |
342 | -- Verify that prefix of attribute N is a float type and that | |
a4f4dbdb | 343 | -- no attribute expressions are present. |
996ae0b0 RK |
344 | |
345 | procedure Check_Floating_Point_Type_1; | |
346 | -- Verify that prefix of attribute N is a float type and that | |
a4f4dbdb | 347 | -- exactly one attribute expression is present. |
996ae0b0 RK |
348 | |
349 | procedure Check_Floating_Point_Type_2; | |
350 | -- Verify that prefix of attribute N is a float type and that | |
351 | -- two attribute expressions are present | |
352 | ||
ce5ba43a | 353 | procedure Check_SPARK_05_Restriction_On_Attribute; |
7a489a2b AC |
354 | -- Issue an error in formal mode because attribute N is allowed |
355 | ||
996ae0b0 RK |
356 | procedure Check_Integer_Type; |
357 | -- Verify that prefix of attribute N is an integer type | |
358 | ||
5f3ab6fb AC |
359 | procedure Check_Modular_Integer_Type; |
360 | -- Verify that prefix of attribute N is a modular integer type | |
361 | ||
21d27997 RD |
362 | procedure Check_Not_CPP_Type; |
363 | -- Check that P (the prefix of the attribute) is not an CPP type | |
364 | -- for which no Ada predefined primitive is available. | |
365 | ||
996ae0b0 RK |
366 | procedure Check_Not_Incomplete_Type; |
367 | -- Check that P (the prefix of the attribute) is not an incomplete | |
368 | -- type or a private type for which no full view has been given. | |
369 | ||
370 | procedure Check_Object_Reference (P : Node_Id); | |
99fc068e | 371 | -- Check that P is an object reference |
996ae0b0 | 372 | |
b6a56408 AC |
373 | procedure Check_PolyORB_Attribute; |
374 | -- Validity checking for PolyORB/DSA attribute | |
375 | ||
996ae0b0 RK |
376 | procedure Check_Program_Unit; |
377 | -- Verify that prefix of attribute N is a program unit | |
378 | ||
379 | procedure Check_Real_Type; | |
380 | -- Verify that prefix of attribute N is fixed or float type | |
381 | ||
382 | procedure Check_Scalar_Type; | |
383 | -- Verify that prefix of attribute N is a scalar type | |
384 | ||
385 | procedure Check_Standard_Prefix; | |
f7ea2603 RD |
386 | -- Verify that prefix of attribute N is package Standard. Also checks |
387 | -- that there are no arguments. | |
996ae0b0 | 388 | |
fbf5a39b AC |
389 | procedure Check_Stream_Attribute (Nam : TSS_Name_Type); |
390 | -- Validity checking for stream attribute. Nam is the TSS name of the | |
996ae0b0 | 391 | -- corresponding possible defined attribute function (e.g. for the |
fbf5a39b | 392 | -- Read attribute, Nam will be TSS_Stream_Read). |
996ae0b0 | 393 | |
f7ea2603 RD |
394 | procedure Check_System_Prefix; |
395 | -- Verify that prefix of attribute N is package System | |
396 | ||
996ae0b0 RK |
397 | procedure Check_Task_Prefix; |
398 | -- Verify that prefix of attribute N is a task or task type | |
399 | ||
400 | procedure Check_Type; | |
401 | -- Verify that the prefix of attribute N is a type | |
402 | ||
403 | procedure Check_Unit_Name (Nod : Node_Id); | |
404 | -- Check that Nod is of the form of a library unit name, i.e that | |
405 | -- it is an identifier, or a selected component whose prefix is | |
406 | -- itself of the form of a library unit name. Note that this is | |
407 | -- quite different from Check_Program_Unit, since it only checks | |
408 | -- the syntactic form of the name, not the semantic identity. This | |
a015ef67 AC |
409 | -- is because it is used with attributes (Elab_Body, Elab_Spec and |
410 | -- Elaborated) which can refer to non-visible unit. | |
996ae0b0 RK |
411 | |
412 | procedure Error_Attr (Msg : String; Error_Node : Node_Id); | |
413 | pragma No_Return (Error_Attr); | |
fbf5a39b AC |
414 | procedure Error_Attr; |
415 | pragma No_Return (Error_Attr); | |
996ae0b0 RK |
416 | -- Posts error using Error_Msg_N at given node, sets type of attribute |
417 | -- node to Any_Type, and then raises Bad_Attribute to avoid any further | |
418 | -- semantic processing. The message typically contains a % insertion | |
fbf5a39b AC |
419 | -- character which is replaced by the attribute name. The call with |
420 | -- no arguments is used when the caller has already generated the | |
421 | -- required error messages. | |
996ae0b0 | 422 | |
822033eb | 423 | procedure Error_Attr_P (Msg : String); |
3ec54569 | 424 | pragma No_Return (Error_Attr_P); |
822033eb HK |
425 | -- Like Error_Attr, but error is posted at the start of the prefix |
426 | ||
e7f23f06 AC |
427 | procedure Legal_Formal_Attribute; |
428 | -- Common processing for attributes Definite and Has_Discriminants. | |
429 | -- Checks that prefix is generic indefinite formal type. | |
430 | ||
85d6bf87 AC |
431 | procedure Max_Alignment_For_Allocation_Max_Size_In_Storage_Elements; |
432 | -- Common processing for attributes Max_Alignment_For_Allocation and | |
433 | -- Max_Size_In_Storage_Elements. | |
434 | ||
435 | procedure Min_Max; | |
436 | -- Common processing for attributes Max and Min | |
437 | ||
996ae0b0 RK |
438 | procedure Standard_Attribute (Val : Int); |
439 | -- Used to process attributes whose prefix is package Standard which | |
440 | -- yield values of type Universal_Integer. The attribute reference | |
edab6088 RD |
441 | -- node is rewritten with an integer literal of the given value which |
442 | -- is marked as static. | |
996ae0b0 | 443 | |
96e90ac1 RD |
444 | procedure Uneval_Old_Msg; |
445 | -- Called when Loop_Entry or Old is used in a potentially unevaluated | |
446 | -- expression. Generates appropriate message or warning depending on | |
1773d80b AC |
447 | -- the setting of Opt.Uneval_Old (or flags in an N_Aspect_Specification |
448 | -- node in the aspect case). | |
96e90ac1 | 449 | |
996ae0b0 | 450 | procedure Unexpected_Argument (En : Node_Id); |
3ec54569 PMR |
451 | pragma No_Return (Unexpected_Argument); |
452 | -- Signal unexpected attribute argument (En is the argument), and then | |
453 | -- raises Bad_Attribute to avoid any further semantic processing. | |
996ae0b0 RK |
454 | |
455 | procedure Validate_Non_Static_Attribute_Function_Call; | |
456 | -- Called when processing an attribute that is a function call to a | |
457 | -- non-static function, i.e. an attribute function that either takes | |
458 | -- non-scalar arguments or returns a non-scalar result. Verifies that | |
459 | -- such a call does not appear in a preelaborable context. | |
460 | ||
3cd4a210 AC |
461 | -------------------- |
462 | -- Address_Checks -- | |
463 | -------------------- | |
464 | ||
465 | procedure Address_Checks is | |
466 | begin | |
467 | -- An Address attribute created by expansion is legal even when it | |
468 | -- applies to other entity-denoting expressions. | |
469 | ||
470 | if not Comes_From_Source (N) then | |
471 | return; | |
472 | ||
473 | -- Address attribute on a protected object self reference is legal | |
474 | ||
475 | elsif Is_Protected_Self_Reference (P) then | |
476 | return; | |
477 | ||
478 | -- Address applied to an entity | |
479 | ||
480 | elsif Is_Entity_Name (P) then | |
481 | declare | |
482 | Ent : constant Entity_Id := Entity (P); | |
483 | ||
484 | begin | |
485 | if Is_Subprogram (Ent) then | |
486 | Set_Address_Taken (Ent); | |
487 | Kill_Current_Values (Ent); | |
488 | ||
489 | -- An Address attribute is accepted when generated by the | |
490 | -- compiler for dispatching operation, and an error is | |
491 | -- issued once the subprogram is frozen (to avoid confusing | |
492 | -- errors about implicit uses of Address in the dispatch | |
493 | -- table initialization). | |
494 | ||
495 | if Has_Pragma_Inline_Always (Entity (P)) | |
496 | and then Comes_From_Source (P) | |
497 | then | |
498 | Error_Attr_P | |
499 | ("prefix of % attribute cannot be Inline_Always " | |
500 | & "subprogram"); | |
501 | ||
502 | -- It is illegal to apply 'Address to an intrinsic | |
503 | -- subprogram. This is now formalized in AI05-0095. | |
504 | -- In an instance, an attempt to obtain 'Address of an | |
505 | -- intrinsic subprogram (e.g the renaming of a predefined | |
506 | -- operator that is an actual) raises Program_Error. | |
507 | ||
508 | elsif Convention (Ent) = Convention_Intrinsic then | |
509 | if In_Instance then | |
510 | Rewrite (N, | |
511 | Make_Raise_Program_Error (Loc, | |
512 | Reason => PE_Address_Of_Intrinsic)); | |
513 | ||
514 | else | |
82893775 | 515 | Error_Msg_Name_1 := Aname; |
3cd4a210 AC |
516 | Error_Msg_N |
517 | ("cannot take % of intrinsic subprogram", N); | |
518 | end if; | |
519 | ||
520 | -- Issue an error if prefix denotes an eliminated subprogram | |
521 | ||
522 | else | |
523 | Check_For_Eliminated_Subprogram (P, Ent); | |
524 | end if; | |
525 | ||
526 | -- Object or label reference | |
527 | ||
528 | elsif Is_Object (Ent) or else Ekind (Ent) = E_Label then | |
529 | Set_Address_Taken (Ent); | |
530 | ||
531 | -- Deal with No_Implicit_Aliasing restriction | |
532 | ||
533 | if Restriction_Check_Required (No_Implicit_Aliasing) then | |
534 | if not Is_Aliased_View (P) then | |
535 | Check_Restriction (No_Implicit_Aliasing, P); | |
536 | else | |
537 | Check_No_Implicit_Aliasing (P); | |
538 | end if; | |
539 | end if; | |
540 | ||
541 | -- If we have an address of an object, and the attribute | |
542 | -- comes from source, then set the object as potentially | |
543 | -- source modified. We do this because the resulting address | |
544 | -- can potentially be used to modify the variable and we | |
545 | -- might not detect this, leading to some junk warnings. | |
546 | ||
547 | Set_Never_Set_In_Source (Ent, False); | |
548 | ||
549 | -- Allow Address to be applied to task or protected type, | |
550 | -- returning null address (what is that about???) | |
551 | ||
552 | elsif (Is_Concurrent_Type (Etype (Ent)) | |
553 | and then Etype (Ent) = Base_Type (Ent)) | |
554 | or else Ekind (Ent) = E_Package | |
555 | or else Is_Generic_Unit (Ent) | |
556 | then | |
557 | Rewrite (N, | |
558 | New_Occurrence_Of (RTE (RE_Null_Address), Sloc (N))); | |
559 | ||
560 | -- Anything else is illegal | |
561 | ||
562 | else | |
563 | Error_Attr ("invalid prefix for % attribute", P); | |
564 | end if; | |
565 | end; | |
566 | ||
3cd4a210 AC |
567 | -- Object is OK |
568 | ||
569 | elsif Is_Object_Reference (P) then | |
570 | return; | |
571 | ||
572 | -- Subprogram called using dot notation | |
573 | ||
574 | elsif Nkind (P) = N_Selected_Component | |
575 | and then Is_Subprogram (Entity (Selector_Name (P))) | |
576 | then | |
577 | return; | |
578 | ||
579 | -- What exactly are we allowing here ??? and is this properly | |
580 | -- documented in the sinfo documentation for this node ??? | |
581 | ||
582 | elsif Relaxed_RM_Semantics | |
583 | and then Nkind (P) = N_Attribute_Reference | |
584 | then | |
585 | return; | |
586 | ||
587 | -- All other non-entity name cases are illegal | |
588 | ||
589 | else | |
590 | Error_Attr ("invalid prefix for % attribute", P); | |
591 | end if; | |
592 | end Address_Checks; | |
593 | ||
fbf5a39b AC |
594 | ------------------------------ |
595 | -- Analyze_Access_Attribute -- | |
596 | ------------------------------ | |
996ae0b0 | 597 | |
fbf5a39b | 598 | procedure Analyze_Access_Attribute is |
996ae0b0 RK |
599 | Acc_Type : Entity_Id; |
600 | ||
601 | Scop : Entity_Id; | |
602 | Typ : Entity_Id; | |
603 | ||
604 | function Build_Access_Object_Type (DT : Entity_Id) return Entity_Id; | |
605 | -- Build an access-to-object type whose designated type is DT, | |
606 | -- and whose Ekind is appropriate to the attribute type. The | |
607 | -- type that is constructed is returned as the result. | |
608 | ||
609 | procedure Build_Access_Subprogram_Type (P : Node_Id); | |
21d27997 RD |
610 | -- Build an access to subprogram whose designated type is the type of |
611 | -- the prefix. If prefix is overloaded, so is the node itself. The | |
612 | -- result is stored in Acc_Type. | |
996ae0b0 | 613 | |
468c6c8a ES |
614 | function OK_Self_Reference return Boolean; |
615 | -- An access reference whose prefix is a type can legally appear | |
616 | -- within an aggregate, where it is obtained by expansion of | |
822033eb HK |
617 | -- a defaulted aggregate. The enclosing aggregate that contains |
618 | -- the self-referenced is flagged so that the self-reference can | |
619 | -- be expanded into a reference to the target object (see exp_aggr). | |
468c6c8a | 620 | |
996ae0b0 RK |
621 | ------------------------------ |
622 | -- Build_Access_Object_Type -- | |
623 | ------------------------------ | |
624 | ||
625 | function Build_Access_Object_Type (DT : Entity_Id) return Entity_Id is | |
fea9e956 ES |
626 | Typ : constant Entity_Id := |
627 | New_Internal_Entity | |
628 | (E_Access_Attribute_Type, Current_Scope, Loc, 'A'); | |
996ae0b0 | 629 | begin |
996ae0b0 | 630 | Set_Etype (Typ, Typ); |
996ae0b0 RK |
631 | Set_Is_Itype (Typ); |
632 | Set_Associated_Node_For_Itype (Typ, N); | |
633 | Set_Directly_Designated_Type (Typ, DT); | |
634 | return Typ; | |
635 | end Build_Access_Object_Type; | |
636 | ||
637 | ---------------------------------- | |
638 | -- Build_Access_Subprogram_Type -- | |
639 | ---------------------------------- | |
640 | ||
641 | procedure Build_Access_Subprogram_Type (P : Node_Id) is | |
12e0c41c AC |
642 | Index : Interp_Index; |
643 | It : Interp; | |
996ae0b0 | 644 | |
822033eb HK |
645 | procedure Check_Local_Access (E : Entity_Id); |
646 | -- Deal with possible access to local subprogram. If we have such | |
647 | -- an access, we set a flag to kill all tracked values on any call | |
648 | -- because this access value may be passed around, and any called | |
649 | -- code might use it to access a local procedure which clobbers a | |
70b70ce8 AC |
650 | -- tracked value. If the scope is a loop or block, indicate that |
651 | -- value tracking is disabled for the enclosing subprogram. | |
822033eb | 652 | |
996ae0b0 | 653 | function Get_Kind (E : Entity_Id) return Entity_Kind; |
edd63e9b | 654 | -- Distinguish between access to regular/protected subprograms |
996ae0b0 | 655 | |
822033eb HK |
656 | ------------------------ |
657 | -- Check_Local_Access -- | |
658 | ------------------------ | |
659 | ||
660 | procedure Check_Local_Access (E : Entity_Id) is | |
661 | begin | |
662 | if not Is_Library_Level_Entity (E) then | |
663 | Set_Suppress_Value_Tracking_On_Call (Current_Scope); | |
70b70ce8 AC |
664 | Set_Suppress_Value_Tracking_On_Call |
665 | (Nearest_Dynamic_Scope (Current_Scope)); | |
822033eb HK |
666 | end if; |
667 | end Check_Local_Access; | |
668 | ||
fbf5a39b AC |
669 | -------------- |
670 | -- Get_Kind -- | |
671 | -------------- | |
672 | ||
996ae0b0 RK |
673 | function Get_Kind (E : Entity_Id) return Entity_Kind is |
674 | begin | |
675 | if Convention (E) = Convention_Protected then | |
676 | return E_Access_Protected_Subprogram_Type; | |
677 | else | |
678 | return E_Access_Subprogram_Type; | |
679 | end if; | |
680 | end Get_Kind; | |
681 | ||
682 | -- Start of processing for Build_Access_Subprogram_Type | |
683 | ||
684 | begin | |
12e0c41c AC |
685 | -- In the case of an access to subprogram, use the name of the |
686 | -- subprogram itself as the designated type. Type-checking in | |
687 | -- this case compares the signatures of the designated types. | |
688 | ||
e10dab7f JM |
689 | -- Note: This fragment of the tree is temporarily malformed |
690 | -- because the correct tree requires an E_Subprogram_Type entity | |
691 | -- as the designated type. In most cases this designated type is | |
12a13f01 | 692 | -- later overridden by the semantics with the type imposed by the |
e10dab7f JM |
693 | -- context during the resolution phase. In the specific case of |
694 | -- the expression Address!(Prim'Unrestricted_Access), used to | |
695 | -- initialize slots of dispatch tables, this work will be done by | |
696 | -- the expander (see Exp_Aggr). | |
697 | ||
698 | -- The reason to temporarily add this kind of node to the tree | |
699 | -- instead of a proper E_Subprogram_Type itype, is the following: | |
700 | -- in case of errors found in the source file we report better | |
701 | -- error messages. For example, instead of generating the | |
702 | -- following error: | |
703 | ||
704 | -- "expected access to subprogram with profile | |
705 | -- defined at line X" | |
706 | ||
707 | -- we currently generate: | |
708 | ||
709 | -- "expected access to function Z defined at line X" | |
710 | ||
edd63e9b ES |
711 | Set_Etype (N, Any_Type); |
712 | ||
996ae0b0 | 713 | if not Is_Overloaded (P) then |
822033eb HK |
714 | Check_Local_Access (Entity (P)); |
715 | ||
edd63e9b | 716 | if not Is_Intrinsic_Subprogram (Entity (P)) then |
e10dab7f JM |
717 | Acc_Type := Create_Itype (Get_Kind (Entity (P)), N); |
718 | Set_Is_Public (Acc_Type, False); | |
edd63e9b | 719 | Set_Etype (Acc_Type, Acc_Type); |
e10dab7f | 720 | Set_Convention (Acc_Type, Convention (Entity (P))); |
edd63e9b ES |
721 | Set_Directly_Designated_Type (Acc_Type, Entity (P)); |
722 | Set_Etype (N, Acc_Type); | |
e10dab7f | 723 | Freeze_Before (N, Acc_Type); |
edd63e9b | 724 | end if; |
996ae0b0 RK |
725 | |
726 | else | |
727 | Get_First_Interp (P, Index, It); | |
996ae0b0 | 728 | while Present (It.Nam) loop |
822033eb HK |
729 | Check_Local_Access (It.Nam); |
730 | ||
996ae0b0 | 731 | if not Is_Intrinsic_Subprogram (It.Nam) then |
e10dab7f JM |
732 | Acc_Type := Create_Itype (Get_Kind (It.Nam), N); |
733 | Set_Is_Public (Acc_Type, False); | |
996ae0b0 | 734 | Set_Etype (Acc_Type, Acc_Type); |
e10dab7f | 735 | Set_Convention (Acc_Type, Convention (It.Nam)); |
996ae0b0 RK |
736 | Set_Directly_Designated_Type (Acc_Type, It.Nam); |
737 | Add_One_Interp (N, Acc_Type, Acc_Type); | |
e10dab7f | 738 | Freeze_Before (N, Acc_Type); |
996ae0b0 RK |
739 | end if; |
740 | ||
741 | Get_Next_Interp (Index, It); | |
742 | end loop; | |
edd63e9b | 743 | end if; |
996ae0b0 | 744 | |
822033eb HK |
745 | -- Cannot be applied to intrinsic. Looking at the tests above, |
746 | -- the only way Etype (N) can still be set to Any_Type is if | |
747 | -- Is_Intrinsic_Subprogram was True for some referenced entity. | |
748 | ||
edd63e9b | 749 | if Etype (N) = Any_Type then |
822033eb | 750 | Error_Attr_P ("prefix of % attribute cannot be intrinsic"); |
996ae0b0 RK |
751 | end if; |
752 | end Build_Access_Subprogram_Type; | |
753 | ||
468c6c8a ES |
754 | ---------------------- |
755 | -- OK_Self_Reference -- | |
756 | ---------------------- | |
757 | ||
758 | function OK_Self_Reference return Boolean is | |
759 | Par : Node_Id; | |
760 | ||
761 | begin | |
762 | Par := Parent (N); | |
763 | while Present (Par) | |
822033eb HK |
764 | and then |
765 | (Nkind (Par) = N_Component_Association | |
766 | or else Nkind (Par) in N_Subexpr) | |
468c6c8a | 767 | loop |
e10dab7f | 768 | if Nkind_In (Par, N_Aggregate, N_Extension_Aggregate) then |
822033eb HK |
769 | if Etype (Par) = Typ then |
770 | Set_Has_Self_Reference (Par); | |
b35e5dcb AC |
771 | |
772 | -- Check the context: the aggregate must be part of the | |
773 | -- initialization of a type or component, or it is the | |
774 | -- resulting expansion in an initialization procedure. | |
775 | ||
776 | if Is_Init_Proc (Current_Scope) then | |
777 | return True; | |
778 | else | |
779 | Par := Parent (Par); | |
780 | while Present (Par) loop | |
781 | if Nkind (Par) = N_Full_Type_Declaration then | |
782 | return True; | |
783 | end if; | |
784 | ||
785 | Par := Parent (Par); | |
786 | end loop; | |
787 | end if; | |
788 | ||
789 | return False; | |
822033eb HK |
790 | end if; |
791 | end if; | |
792 | ||
468c6c8a ES |
793 | Par := Parent (Par); |
794 | end loop; | |
795 | ||
822033eb HK |
796 | -- No enclosing aggregate, or not a self-reference |
797 | ||
798 | return False; | |
468c6c8a ES |
799 | end OK_Self_Reference; |
800 | ||
fbf5a39b | 801 | -- Start of processing for Analyze_Access_Attribute |
996ae0b0 RK |
802 | |
803 | begin | |
ce5ba43a | 804 | Check_SPARK_05_Restriction_On_Attribute; |
996ae0b0 RK |
805 | Check_E0; |
806 | ||
807 | if Nkind (P) = N_Character_Literal then | |
822033eb HK |
808 | Error_Attr_P |
809 | ("prefix of % attribute cannot be enumeration literal"); | |
fbf5a39b | 810 | end if; |
996ae0b0 | 811 | |
90e491a7 PMR |
812 | -- Preserve relevant elaboration-related attributes of the context |
813 | -- which are no longer available or very expensive to recompute once | |
814 | -- analysis, resolution, and expansion are over. | |
815 | ||
816 | Mark_Elaboration_Attributes | |
162ed06f HK |
817 | (N_Id => N, |
818 | Checks => True, | |
819 | Modes => True, | |
820 | Warnings => True); | |
90e491a7 PMR |
821 | |
822 | -- Save the scenario for later examination by the ABE Processing | |
823 | -- phase. | |
824 | ||
825 | Record_Elaboration_Scenario (N); | |
826 | ||
12e0c41c | 827 | -- Case of access to subprogram |
996ae0b0 | 828 | |
b07b7ace | 829 | if Is_Entity_Name (P) and then Is_Overloadable (Entity (P)) then |
7b76e805 | 830 | if Has_Pragma_Inline_Always (Entity (P)) then |
822033eb HK |
831 | Error_Attr_P |
832 | ("prefix of % attribute cannot be Inline_Always subprogram"); | |
edd63e9b | 833 | |
a7e68e7f | 834 | elsif Aname = Name_Unchecked_Access then |
468c6c8a ES |
835 | Error_Attr ("attribute% cannot be applied to a subprogram", P); |
836 | end if; | |
837 | ||
16212e89 GD |
838 | -- Issue an error if the prefix denotes an eliminated subprogram |
839 | ||
840 | Check_For_Eliminated_Subprogram (P, Entity (P)); | |
841 | ||
b5c739f9 RD |
842 | -- Check for obsolescent subprogram reference |
843 | ||
844 | Check_Obsolescent_2005_Entity (Entity (P), P); | |
845 | ||
12e0c41c AC |
846 | -- Build the appropriate subprogram type |
847 | ||
996ae0b0 | 848 | Build_Access_Subprogram_Type (P); |
fbf5a39b | 849 | |
6b81741c AC |
850 | -- For P'Access or P'Unrestricted_Access, where P is a nested |
851 | -- subprogram, we might be passing P to another subprogram (but we | |
852 | -- don't check that here), which might call P. P could modify | |
853 | -- local variables, so we need to kill current values. It is | |
854 | -- important not to do this for library-level subprograms, because | |
855 | -- Kill_Current_Values is very inefficient in the case of library | |
856 | -- level packages with lots of tagged types. | |
857 | ||
858 | if Is_Library_Level_Entity (Entity (Prefix (N))) then | |
859 | null; | |
860 | ||
861 | -- Do not kill values on nodes initializing dispatch tables | |
862 | -- slots. The construct Prim_Ptr!(Prim'Unrestricted_Access) | |
863 | -- is currently generated by the expander only for this | |
864 | -- purpose. Done to keep the quality of warnings currently | |
865 | -- generated by the compiler (otherwise any declaration of | |
866 | -- a tagged type cleans constant indications from its scope). | |
867 | ||
868 | elsif Nkind (Parent (N)) = N_Unchecked_Type_Conversion | |
869 | and then (Etype (Parent (N)) = RTE (RE_Prim_Ptr) | |
870 | or else | |
871 | Etype (Parent (N)) = RTE (RE_Size_Ptr)) | |
872 | and then Is_Dispatching_Operation | |
873 | (Directly_Designated_Type (Etype (N))) | |
874 | then | |
875 | null; | |
876 | ||
877 | else | |
878 | Kill_Current_Values; | |
fbf5a39b AC |
879 | end if; |
880 | ||
967947ed PMR |
881 | -- In the static elaboration model, treat the attribute reference |
882 | -- as a subprogram call for elaboration purposes. Suppress this | |
883 | -- treatment under debug flag. In any case, we are all done. | |
884 | ||
885 | if Legacy_Elaboration_Checks | |
886 | and not Dynamic_Elaboration_Checks | |
887 | and not Debug_Flag_Dot_UU | |
888 | then | |
889 | Check_Elab_Call (N); | |
890 | end if; | |
891 | ||
996ae0b0 RK |
892 | return; |
893 | ||
12e0c41c | 894 | -- Component is an operation of a protected type |
996ae0b0 | 895 | |
fbf5a39b AC |
896 | elsif Nkind (P) = N_Selected_Component |
897 | and then Is_Overloadable (Entity (Selector_Name (P))) | |
996ae0b0 RK |
898 | then |
899 | if Ekind (Entity (Selector_Name (P))) = E_Entry then | |
822033eb | 900 | Error_Attr_P ("prefix of % attribute must be subprogram"); |
996ae0b0 RK |
901 | end if; |
902 | ||
903 | Build_Access_Subprogram_Type (Selector_Name (P)); | |
904 | return; | |
905 | end if; | |
906 | ||
907 | -- Deal with incorrect reference to a type, but note that some | |
468c6c8a ES |
908 | -- accesses are allowed: references to the current type instance, |
909 | -- or in Ada 2005 self-referential pointer in a default-initialized | |
910 | -- aggregate. | |
996ae0b0 RK |
911 | |
912 | if Is_Entity_Name (P) then | |
996ae0b0 RK |
913 | Typ := Entity (P); |
914 | ||
65f01153 RD |
915 | -- The reference may appear in an aggregate that has been expanded |
916 | -- into a loop. Locate scope of type definition, if any. | |
917 | ||
918 | Scop := Current_Scope; | |
919 | while Ekind (Scop) = E_Loop loop | |
920 | Scop := Scope (Scop); | |
921 | end loop; | |
922 | ||
996ae0b0 RK |
923 | if Is_Type (Typ) then |
924 | ||
925 | -- OK if we are within the scope of a limited type | |
926 | -- let's mark the component as having per object constraint | |
927 | ||
928 | if Is_Anonymous_Tagged_Base (Scop, Typ) then | |
929 | Typ := Scop; | |
930 | Set_Entity (P, Typ); | |
931 | Set_Etype (P, Typ); | |
932 | end if; | |
933 | ||
934 | if Typ = Scop then | |
935 | declare | |
936 | Q : Node_Id := Parent (N); | |
937 | ||
938 | begin | |
939 | while Present (Q) | |
940 | and then Nkind (Q) /= N_Component_Declaration | |
941 | loop | |
942 | Q := Parent (Q); | |
943 | end loop; | |
65f01153 | 944 | |
996ae0b0 | 945 | if Present (Q) then |
b87971f3 AC |
946 | Set_Has_Per_Object_Constraint |
947 | (Defining_Identifier (Q), True); | |
996ae0b0 RK |
948 | end if; |
949 | end; | |
950 | ||
951 | if Nkind (P) = N_Expanded_Name then | |
822033eb | 952 | Error_Msg_F |
996ae0b0 RK |
953 | ("current instance prefix must be a direct name", P); |
954 | end if; | |
955 | ||
21d27997 RD |
956 | -- If a current instance attribute appears in a component |
957 | -- constraint it must appear alone; other contexts (spec- | |
958 | -- expressions, within a task body) are not subject to this | |
959 | -- restriction. | |
996ae0b0 | 960 | |
21d27997 | 961 | if not In_Spec_Expression |
996ae0b0 | 962 | and then not Has_Completion (Scop) |
e10dab7f JM |
963 | and then not |
964 | Nkind_In (Parent (N), N_Discriminant_Association, | |
965 | N_Index_Or_Discriminant_Constraint) | |
996ae0b0 RK |
966 | then |
967 | Error_Msg_N | |
968 | ("current instance attribute must appear alone", N); | |
969 | end if; | |
cefce34c JM |
970 | |
971 | if Is_CPP_Class (Root_Type (Typ)) then | |
972 | Error_Msg_N | |
324ac540 | 973 | ("??current instance unsupported for derivations of " |
cefce34c JM |
974 | & "'C'P'P types", N); |
975 | end if; | |
996ae0b0 RK |
976 | |
977 | -- OK if we are in initialization procedure for the type | |
978 | -- in question, in which case the reference to the type | |
979 | -- is rewritten as a reference to the current object. | |
980 | ||
981 | elsif Ekind (Scop) = E_Procedure | |
fbf5a39b | 982 | and then Is_Init_Proc (Scop) |
996ae0b0 RK |
983 | and then Etype (First_Formal (Scop)) = Typ |
984 | then | |
985 | Rewrite (N, | |
986 | Make_Attribute_Reference (Loc, | |
987 | Prefix => Make_Identifier (Loc, Name_uInit), | |
988 | Attribute_Name => Name_Unrestricted_Access)); | |
989 | Analyze (N); | |
990 | return; | |
991 | ||
992 | -- OK if a task type, this test needs sharpening up ??? | |
993 | ||
994 | elsif Is_Task_Type (Typ) then | |
995 | null; | |
996 | ||
468c6c8a ES |
997 | -- OK if self-reference in an aggregate in Ada 2005, and |
998 | -- the reference comes from a copied default expression. | |
999 | ||
822033eb HK |
1000 | -- Note that we check legality of self-reference even if the |
1001 | -- expression comes from source, e.g. when a single component | |
1002 | -- association in an aggregate has a box association. | |
1003 | ||
0791fbe9 | 1004 | elsif Ada_Version >= Ada_2005 |
468c6c8a ES |
1005 | and then OK_Self_Reference |
1006 | then | |
1007 | null; | |
1008 | ||
ae8c7d87 | 1009 | -- OK if reference to current instance of a protected object |
2d14501c ST |
1010 | |
1011 | elsif Is_Protected_Self_Reference (P) then | |
1012 | null; | |
1013 | ||
996ae0b0 RK |
1014 | -- Otherwise we have an error case |
1015 | ||
1016 | else | |
1017 | Error_Attr ("% attribute cannot be applied to type", P); | |
1018 | return; | |
1019 | end if; | |
1020 | end if; | |
1021 | end if; | |
1022 | ||
b07b7ace AC |
1023 | -- If we fall through, we have a normal access to object case |
1024 | ||
1025 | -- Unrestricted_Access is (for now) legal wherever an allocator would | |
1026 | -- be legal, so its Etype is set to E_Allocator. The expected type | |
996ae0b0 RK |
1027 | -- of the other attributes is a general access type, and therefore |
1028 | -- we label them with E_Access_Attribute_Type. | |
1029 | ||
1030 | if not Is_Overloaded (P) then | |
1031 | Acc_Type := Build_Access_Object_Type (P_Type); | |
1032 | Set_Etype (N, Acc_Type); | |
b07b7ace | 1033 | |
996ae0b0 RK |
1034 | else |
1035 | declare | |
1036 | Index : Interp_Index; | |
1037 | It : Interp; | |
996ae0b0 RK |
1038 | begin |
1039 | Set_Etype (N, Any_Type); | |
1040 | Get_First_Interp (P, Index, It); | |
996ae0b0 RK |
1041 | while Present (It.Typ) loop |
1042 | Acc_Type := Build_Access_Object_Type (It.Typ); | |
1043 | Add_One_Interp (N, Acc_Type, Acc_Type); | |
1044 | Get_Next_Interp (Index, It); | |
1045 | end loop; | |
1046 | end; | |
1047 | end if; | |
1048 | ||
6f31a9d7 | 1049 | -- Special cases when we can find a prefix that is an entity name |
fbf5a39b | 1050 | |
6f31a9d7 RD |
1051 | declare |
1052 | PP : Node_Id; | |
1053 | Ent : Entity_Id; | |
1054 | ||
1055 | begin | |
1056 | PP := P; | |
1057 | loop | |
1058 | if Is_Entity_Name (PP) then | |
1059 | Ent := Entity (PP); | |
822033eb | 1060 | |
6f31a9d7 RD |
1061 | -- If we have an access to an object, and the attribute |
1062 | -- comes from source, then set the object as potentially | |
1063 | -- source modified. We do this because the resulting access | |
1064 | -- pointer can be used to modify the variable, and we might | |
1065 | -- not detect this, leading to some junk warnings. | |
822033eb | 1066 | |
74014283 RD |
1067 | -- We only do this for source references, since otherwise |
1068 | -- we can suppress warnings, e.g. from the unrestricted | |
1069 | -- access generated for validity checks in -gnatVa mode. | |
1070 | ||
1071 | if Comes_From_Source (N) then | |
1072 | Set_Never_Set_In_Source (Ent, False); | |
1073 | end if; | |
822033eb | 1074 | |
2168d7cc AC |
1075 | -- Mark entity as address taken in the case of |
1076 | -- 'Unrestricted_Access or subprograms, and kill current | |
1077 | -- values. | |
1078 | ||
1079 | if Aname = Name_Unrestricted_Access | |
1080 | or else Is_Subprogram (Ent) | |
1081 | then | |
1082 | Set_Address_Taken (Ent); | |
1083 | end if; | |
822033eb | 1084 | |
6f31a9d7 RD |
1085 | Kill_Current_Values (Ent); |
1086 | exit; | |
1087 | ||
e10dab7f JM |
1088 | elsif Nkind_In (PP, N_Selected_Component, |
1089 | N_Indexed_Component) | |
6f31a9d7 RD |
1090 | then |
1091 | PP := Prefix (PP); | |
1092 | ||
1093 | else | |
1094 | exit; | |
1095 | end if; | |
1096 | end loop; | |
1097 | end; | |
fbf5a39b | 1098 | end Analyze_Access_Attribute; |
996ae0b0 | 1099 | |
b6a56408 AC |
1100 | ---------------------------------- |
1101 | -- Analyze_Attribute_Old_Result -- | |
1102 | ---------------------------------- | |
1103 | ||
1104 | procedure Analyze_Attribute_Old_Result | |
1105 | (Legal : out Boolean; | |
1106 | Spec_Id : out Entity_Id) | |
1107 | is | |
1108 | procedure Check_Placement_In_Check (Prag : Node_Id); | |
1109 | -- Verify that the attribute appears within pragma Check that mimics | |
1110 | -- a postcondition. | |
1111 | ||
1112 | procedure Check_Placement_In_Contract_Cases (Prag : Node_Id); | |
1113 | -- Verify that the attribute appears within a consequence of aspect | |
1114 | -- or pragma Contract_Cases denoted by Prag. | |
1115 | ||
1116 | procedure Check_Placement_In_Test_Case (Prag : Node_Id); | |
1117 | -- Verify that the attribute appears within the "Ensures" argument of | |
1118 | -- aspect or pragma Test_Case denoted by Prag. | |
1119 | ||
1120 | function Is_Within | |
1121 | (Nod : Node_Id; | |
1122 | Encl_Nod : Node_Id) return Boolean; | |
1123 | -- Subsidiary to Check_Placemenet_In_XXX. Determine whether arbitrary | |
1124 | -- node Nod is within enclosing node Encl_Nod. | |
1125 | ||
26f36fc9 | 1126 | procedure Placement_Error; |
3ec54569 | 1127 | pragma No_Return (Placement_Error); |
26f36fc9 | 1128 | -- Emit a general error when the attributes does not appear in a |
3ec54569 PMR |
1129 | -- postcondition-like aspect or pragma, and then raises Bad_Attribute |
1130 | -- to avoid any further semantic processing. | |
26f36fc9 | 1131 | |
b6a56408 AC |
1132 | ------------------------------ |
1133 | -- Check_Placement_In_Check -- | |
1134 | ------------------------------ | |
1135 | ||
1136 | procedure Check_Placement_In_Check (Prag : Node_Id) is | |
1137 | Args : constant List_Id := Pragma_Argument_Associations (Prag); | |
1138 | Nam : constant Name_Id := Chars (Get_Pragma_Arg (First (Args))); | |
1139 | ||
1140 | begin | |
1141 | -- The "Name" argument of pragma Check denotes a postcondition | |
1142 | ||
1143 | if Nam_In (Nam, Name_Post, | |
1144 | Name_Post_Class, | |
1145 | Name_Postcondition, | |
1146 | Name_Refined_Post) | |
1147 | then | |
1148 | null; | |
1149 | ||
1150 | -- Otherwise the placement of the attribute is illegal | |
1151 | ||
1152 | else | |
26f36fc9 | 1153 | Placement_Error; |
b6a56408 AC |
1154 | end if; |
1155 | end Check_Placement_In_Check; | |
1156 | ||
1157 | --------------------------------------- | |
1158 | -- Check_Placement_In_Contract_Cases -- | |
1159 | --------------------------------------- | |
1160 | ||
1161 | procedure Check_Placement_In_Contract_Cases (Prag : Node_Id) is | |
1162 | Arg : Node_Id; | |
1163 | Cases : Node_Id; | |
1164 | CCase : Node_Id; | |
1165 | ||
1166 | begin | |
1167 | -- Obtain the argument of the aspect or pragma | |
1168 | ||
1169 | if Nkind (Prag) = N_Aspect_Specification then | |
1170 | Arg := Prag; | |
1171 | else | |
1172 | Arg := First (Pragma_Argument_Associations (Prag)); | |
1173 | end if; | |
1174 | ||
1175 | Cases := Expression (Arg); | |
1176 | ||
1177 | if Present (Component_Associations (Cases)) then | |
1178 | CCase := First (Component_Associations (Cases)); | |
1179 | while Present (CCase) loop | |
1180 | ||
1181 | -- Detect whether the attribute appears within the | |
1182 | -- consequence of the current contract case. | |
1183 | ||
1184 | if Nkind (CCase) = N_Component_Association | |
1185 | and then Is_Within (N, Expression (CCase)) | |
1186 | then | |
1187 | return; | |
1188 | end if; | |
1189 | ||
1190 | Next (CCase); | |
1191 | end loop; | |
1192 | end if; | |
1193 | ||
1194 | -- Otherwise aspect or pragma Contract_Cases is either malformed | |
1195 | -- or the attribute does not appear within a consequence. | |
1196 | ||
1197 | Error_Attr | |
1198 | ("attribute % must appear in the consequence of a contract case", | |
1199 | P); | |
1200 | end Check_Placement_In_Contract_Cases; | |
1201 | ||
1202 | ---------------------------------- | |
1203 | -- Check_Placement_In_Test_Case -- | |
1204 | ---------------------------------- | |
1205 | ||
1206 | procedure Check_Placement_In_Test_Case (Prag : Node_Id) is | |
1207 | Arg : constant Node_Id := | |
1208 | Test_Case_Arg | |
1209 | (Prag => Prag, | |
1210 | Arg_Nam => Name_Ensures, | |
1211 | From_Aspect => Nkind (Prag) = N_Aspect_Specification); | |
1212 | ||
1213 | begin | |
1214 | -- Detect whether the attribute appears within the "Ensures" | |
1215 | -- expression of aspect or pragma Test_Case. | |
1216 | ||
1217 | if Present (Arg) and then Is_Within (N, Arg) then | |
1218 | null; | |
1219 | ||
1220 | else | |
1221 | Error_Attr | |
1222 | ("attribute % must appear in the ensures expression of a " | |
1223 | & "test case", P); | |
1224 | end if; | |
1225 | end Check_Placement_In_Test_Case; | |
1226 | ||
1227 | --------------- | |
1228 | -- Is_Within -- | |
1229 | --------------- | |
1230 | ||
1231 | function Is_Within | |
1232 | (Nod : Node_Id; | |
1233 | Encl_Nod : Node_Id) return Boolean | |
1234 | is | |
1235 | Par : Node_Id; | |
1236 | ||
1237 | begin | |
1238 | Par := Nod; | |
1239 | while Present (Par) loop | |
1240 | if Par = Encl_Nod then | |
1241 | return True; | |
1242 | ||
1243 | -- Prevent the search from going too far | |
1244 | ||
1245 | elsif Is_Body_Or_Package_Declaration (Par) then | |
1246 | exit; | |
1247 | end if; | |
1248 | ||
1249 | Par := Parent (Par); | |
1250 | end loop; | |
1251 | ||
1252 | return False; | |
1253 | end Is_Within; | |
1254 | ||
26f36fc9 AC |
1255 | --------------------- |
1256 | -- Placement_Error -- | |
1257 | --------------------- | |
1258 | ||
1259 | procedure Placement_Error is | |
1260 | begin | |
1261 | if Aname = Name_Old then | |
1262 | Error_Attr ("attribute % can only appear in postcondition", P); | |
1263 | ||
1264 | -- Specialize the error message for attribute 'Result | |
1265 | ||
1266 | else | |
1267 | Error_Attr | |
1268 | ("attribute % can only appear in postcondition of function", | |
1269 | P); | |
1270 | end if; | |
1271 | end Placement_Error; | |
1272 | ||
b6a56408 AC |
1273 | -- Local variables |
1274 | ||
1275 | Prag : Node_Id; | |
1276 | Prag_Nam : Name_Id; | |
1277 | Subp_Decl : Node_Id; | |
1278 | ||
1279 | -- Start of processing for Analyze_Attribute_Old_Result | |
1280 | ||
1281 | begin | |
1282 | -- Assume that the attribute is illegal | |
1283 | ||
1284 | Legal := False; | |
1285 | Spec_Id := Empty; | |
1286 | ||
1287 | -- Traverse the parent chain to find the aspect or pragma where the | |
1288 | -- attribute resides. | |
1289 | ||
1290 | Prag := N; | |
1291 | while Present (Prag) loop | |
1292 | if Nkind_In (Prag, N_Aspect_Specification, N_Pragma) then | |
1293 | exit; | |
1294 | ||
1295 | -- Prevent the search from going too far | |
1296 | ||
1297 | elsif Is_Body_Or_Package_Declaration (Prag) then | |
1298 | exit; | |
1299 | end if; | |
1300 | ||
1301 | Prag := Parent (Prag); | |
1302 | end loop; | |
1303 | ||
1304 | -- The attribute is allowed to appear only in postcondition-like | |
1305 | -- aspects or pragmas. | |
1306 | ||
1307 | if Nkind_In (Prag, N_Aspect_Specification, N_Pragma) then | |
1308 | if Nkind (Prag) = N_Aspect_Specification then | |
1309 | Prag_Nam := Chars (Identifier (Prag)); | |
1310 | else | |
6e759c2a | 1311 | Prag_Nam := Pragma_Name (Prag); |
b6a56408 AC |
1312 | end if; |
1313 | ||
1314 | if Prag_Nam = Name_Check then | |
1315 | Check_Placement_In_Check (Prag); | |
1316 | ||
1317 | elsif Prag_Nam = Name_Contract_Cases then | |
1318 | Check_Placement_In_Contract_Cases (Prag); | |
1319 | ||
caf07df9 AC |
1320 | -- Attribute 'Result is allowed to appear in aspect or pragma |
1321 | -- [Refined_]Depends (SPARK RM 6.1.5(11)). | |
1322 | ||
1323 | elsif Nam_In (Prag_Nam, Name_Depends, Name_Refined_Depends) | |
1324 | and then Aname = Name_Result | |
1325 | then | |
1326 | null; | |
1327 | ||
b6a56408 AC |
1328 | elsif Nam_In (Prag_Nam, Name_Post, |
1329 | Name_Post_Class, | |
1330 | Name_Postcondition, | |
1331 | Name_Refined_Post) | |
1332 | then | |
1333 | null; | |
1334 | ||
1335 | elsif Prag_Nam = Name_Test_Case then | |
1336 | Check_Placement_In_Test_Case (Prag); | |
1337 | ||
1338 | else | |
26f36fc9 | 1339 | Placement_Error; |
b6a56408 AC |
1340 | return; |
1341 | end if; | |
1342 | ||
1343 | -- Otherwise the placement of the attribute is illegal | |
1344 | ||
1345 | else | |
26f36fc9 | 1346 | Placement_Error; |
b6a56408 AC |
1347 | return; |
1348 | end if; | |
1349 | ||
1350 | -- Find the related subprogram subject to the aspect or pragma | |
1351 | ||
1352 | if Nkind (Prag) = N_Aspect_Specification then | |
1353 | Subp_Decl := Parent (Prag); | |
1354 | else | |
f99ff327 | 1355 | Subp_Decl := Find_Related_Declaration_Or_Body (Prag); |
b6a56408 AC |
1356 | end if; |
1357 | ||
1358 | -- The aspect or pragma where the attribute resides should be | |
1359 | -- associated with a subprogram declaration or a body. If this is not | |
1360 | -- the case, then the aspect or pragma is illegal. Return as analysis | |
0c3f76ba AC |
1361 | -- cannot be carried out. Note that it is legal to have the aspect |
1362 | -- appear on a subprogram renaming, when the renamed entity is an | |
1363 | -- attribute reference. | |
b6a56408 | 1364 | |
fc3a3580 AC |
1365 | -- Generating C code the internally built nested _postcondition |
1366 | -- subprograms are inlined; after expanded, inlined aspects are | |
1367 | -- located in the internal block generated by the frontend. | |
1368 | ||
1369 | if Nkind (Subp_Decl) = N_Block_Statement | |
1370 | and then Modify_Tree_For_C | |
1371 | and then In_Inlined_Body | |
1372 | then | |
1373 | null; | |
1374 | ||
1375 | elsif not Nkind_In (Subp_Decl, N_Abstract_Subprogram_Declaration, | |
1376 | N_Entry_Declaration, | |
0691ed6b | 1377 | N_Expression_Function, |
fc3a3580 AC |
1378 | N_Generic_Subprogram_Declaration, |
1379 | N_Subprogram_Body, | |
1380 | N_Subprogram_Body_Stub, | |
1381 | N_Subprogram_Declaration, | |
1382 | N_Subprogram_Renaming_Declaration) | |
b6a56408 AC |
1383 | then |
1384 | return; | |
1385 | end if; | |
1386 | ||
1387 | -- If we get here, then the attribute is legal | |
1388 | ||
1389 | Legal := True; | |
877a5a12 | 1390 | Spec_Id := Unique_Defining_Entity (Subp_Decl); |
1ba563f5 AC |
1391 | |
1392 | -- When generating C code, nested _postcondition subprograms are | |
1393 | -- inlined by the front end to avoid problems (when unnested) with | |
1394 | -- referenced itypes. Handle that here, since as part of inlining the | |
1395 | -- expander nests subprogram within a dummy procedure named _parent | |
1396 | -- (see Build_Postconditions_Procedure and Build_Body_To_Inline). | |
1397 | -- Hence, in this context, the spec_id of _postconditions is the | |
1398 | -- enclosing scope. | |
1399 | ||
64f5d139 | 1400 | if Modify_Tree_For_C |
1ba563f5 AC |
1401 | and then Chars (Spec_Id) = Name_uParent |
1402 | and then Chars (Scope (Spec_Id)) = Name_uPostconditions | |
1403 | then | |
64f5d139 | 1404 | -- This situation occurs only when preanalyzing the inlined body |
fb757f7d | 1405 | |
64f5d139 JM |
1406 | pragma Assert (not Full_Analysis); |
1407 | ||
1ba563f5 AC |
1408 | Spec_Id := Scope (Spec_Id); |
1409 | pragma Assert (Is_Inlined (Spec_Id)); | |
1410 | end if; | |
b6a56408 AC |
1411 | end Analyze_Attribute_Old_Result; |
1412 | ||
b276ab7a AC |
1413 | ----------------------------- |
1414 | -- Analyze_Image_Attribute -- | |
1415 | ----------------------------- | |
1416 | ||
1417 | procedure Analyze_Image_Attribute (Str_Typ : Entity_Id) is | |
1418 | begin | |
1419 | Check_SPARK_05_Restriction_On_Attribute; | |
1420 | ||
1421 | -- AI12-00124: The ARG has adopted the GNAT semantics of 'Img for | |
1422 | -- scalar types, so that the prefix can be an object, a named value, | |
1423 | -- or a type, and there is no need for an argument in this case. | |
1424 | ||
1425 | if Attr_Id = Attribute_Img | |
1426 | or else (Ada_Version > Ada_2005 and then Is_Object_Image (P)) | |
1427 | then | |
1428 | Check_E0; | |
1429 | Set_Etype (N, Str_Typ); | |
1430 | ||
1431 | if Attr_Id = Attribute_Img and then not Is_Object_Image (P) then | |
1432 | Error_Attr_P | |
1433 | ("prefix of % attribute must be a scalar object name"); | |
1434 | end if; | |
1435 | else | |
1436 | Check_E1; | |
1437 | Set_Etype (N, Str_Typ); | |
1438 | ||
1439 | -- Check that the prefix type is scalar - much in the same way as | |
1440 | -- Check_Scalar_Type but with custom error messages to denote the | |
1441 | -- variants of 'Image attributes. | |
1442 | ||
1443 | if Is_Entity_Name (P) | |
1444 | and then Is_Type (Entity (P)) | |
1445 | and then Ekind (Entity (P)) = E_Incomplete_Type | |
1446 | and then Present (Full_View (Entity (P))) | |
1447 | then | |
1448 | P_Type := Full_View (Entity (P)); | |
1449 | Set_Entity (P, P_Type); | |
1450 | end if; | |
1451 | ||
1452 | if not Is_Entity_Name (P) | |
1453 | or else not Is_Type (Entity (P)) | |
1454 | or else not Is_Scalar_Type (P_Type) | |
1455 | then | |
1456 | if Ada_Version > Ada_2005 then | |
1457 | Error_Attr_P | |
1458 | ("prefix of % attribute must be a scalar type or a scalar " | |
643827e9 | 1459 | & "object name"); |
b276ab7a AC |
1460 | else |
1461 | Error_Attr_P ("prefix of % attribute must be a scalar type"); | |
1462 | end if; | |
1463 | ||
1464 | elsif Is_Protected_Self_Reference (P) then | |
1465 | Error_Attr_P | |
1466 | ("prefix of % attribute denotes current instance " | |
1467 | & "(RM 9.4(21/2))"); | |
1468 | end if; | |
1469 | ||
1470 | Resolve (E1, P_Base_Type); | |
1471 | Validate_Non_Static_Attribute_Function_Call; | |
1472 | end if; | |
1473 | ||
1474 | Check_Enum_Image; | |
1475 | ||
1476 | -- Check restriction No_Fixed_IO. Note the check of Comes_From_Source | |
1477 | -- to avoid giving a duplicate message for when Image attributes | |
1478 | -- applied to object references get expanded into type-based Image | |
1479 | -- attributes. | |
1480 | ||
1481 | if Restriction_Check_Required (No_Fixed_IO) | |
1482 | and then Comes_From_Source (N) | |
1483 | and then Is_Fixed_Point_Type (P_Type) | |
1484 | then | |
1485 | Check_Restriction (No_Fixed_IO, P); | |
1486 | end if; | |
1487 | end Analyze_Image_Attribute; | |
1488 | ||
26df19ce AC |
1489 | --------------------------------- |
1490 | -- Bad_Attribute_For_Predicate -- | |
1491 | --------------------------------- | |
1492 | ||
1493 | procedure Bad_Attribute_For_Predicate is | |
1494 | begin | |
9515740f | 1495 | if Is_Scalar_Type (P_Type) |
739e7bbf | 1496 | and then Comes_From_Source (N) |
9515740f | 1497 | then |
26df19ce | 1498 | Error_Msg_Name_1 := Aname; |
86200f66 | 1499 | Bad_Predicated_Subtype_Use |
ed00f472 | 1500 | ("type& has predicates, attribute % not allowed", N, P_Type); |
26df19ce AC |
1501 | end if; |
1502 | end Bad_Attribute_For_Predicate; | |
1503 | ||
996ae0b0 RK |
1504 | -------------------------------- |
1505 | -- Check_Array_Or_Scalar_Type -- | |
1506 | -------------------------------- | |
1507 | ||
1508 | procedure Check_Array_Or_Scalar_Type is | |
268aeaa9 AC |
1509 | function In_Aspect_Specification return Boolean; |
1510 | -- A current instance of a type in an aspect specification is an | |
1511 | -- object and not a type, and therefore cannot be of a scalar type | |
1512 | -- in the prefix of one of the array attributes if the attribute | |
1513 | -- reference is part of an aspect expression. | |
1514 | ||
1515 | ----------------------------- | |
1516 | -- In_Aspect_Specification -- | |
1517 | ----------------------------- | |
1518 | ||
1519 | function In_Aspect_Specification return Boolean is | |
1520 | P : Node_Id; | |
1521 | ||
1522 | begin | |
1523 | P := Parent (N); | |
1524 | while Present (P) loop | |
1525 | if Nkind (P) = N_Aspect_Specification then | |
1526 | return P_Type = Entity (P); | |
1527 | ||
1528 | elsif Nkind (P) in N_Declaration then | |
1529 | return False; | |
1530 | end if; | |
1531 | ||
1532 | P := Parent (P); | |
1533 | end loop; | |
1534 | ||
1535 | return False; | |
1536 | end In_Aspect_Specification; | |
1537 | ||
1538 | -- Local variables | |
1539 | ||
1540 | Dims : Int; | |
996ae0b0 RK |
1541 | Index : Entity_Id; |
1542 | ||
268aeaa9 | 1543 | -- Start of processing for Check_Array_Or_Scalar_Type |
996ae0b0 RK |
1544 | |
1545 | begin | |
1546 | -- Case of string literal or string literal subtype. These cases | |
1547 | -- cannot arise from legal Ada code, but the expander is allowed | |
1548 | -- to generate them. They require special handling because string | |
1549 | -- literal subtypes do not have standard bounds (the whole idea | |
1550 | -- of these subtypes is to avoid having to generate the bounds) | |
1551 | ||
1552 | if Ekind (P_Type) = E_String_Literal_Subtype then | |
1553 | Set_Etype (N, Etype (First_Index (P_Base_Type))); | |
1554 | return; | |
1555 | ||
1556 | -- Scalar types | |
1557 | ||
1558 | elsif Is_Scalar_Type (P_Type) then | |
1559 | Check_Type; | |
1560 | ||
1561 | if Present (E1) then | |
1562 | Error_Attr ("invalid argument in % attribute", E1); | |
268aeaa9 AC |
1563 | |
1564 | elsif In_Aspect_Specification then | |
1565 | Error_Attr | |
1566 | ("prefix of % attribute cannot be the current instance of a " | |
1567 | & "scalar type", P); | |
1568 | ||
996ae0b0 RK |
1569 | else |
1570 | Set_Etype (N, P_Base_Type); | |
1571 | return; | |
1572 | end if; | |
1573 | ||
1574 | -- The following is a special test to allow 'First to apply to | |
1575 | -- private scalar types if the attribute comes from generated | |
1576 | -- code. This occurs in the case of Normalize_Scalars code. | |
1577 | ||
1578 | elsif Is_Private_Type (P_Type) | |
1579 | and then Present (Full_View (P_Type)) | |
1580 | and then Is_Scalar_Type (Full_View (P_Type)) | |
1581 | and then not Comes_From_Source (N) | |
1582 | then | |
1583 | Set_Etype (N, Implementation_Base_Type (P_Type)); | |
1584 | ||
1585 | -- Array types other than string literal subtypes handled above | |
1586 | ||
1587 | else | |
1588 | Check_Array_Type; | |
1589 | ||
1590 | -- We know prefix is an array type, or the name of an array | |
1591 | -- object, and that the expression, if present, is static | |
1592 | -- and within the range of the dimensions of the type. | |
1593 | ||
5453d5bd AC |
1594 | pragma Assert (Is_Array_Type (P_Type)); |
1595 | Index := First_Index (P_Base_Type); | |
996ae0b0 RK |
1596 | |
1597 | if No (E1) then | |
1598 | ||
1599 | -- First dimension assumed | |
1600 | ||
1601 | Set_Etype (N, Base_Type (Etype (Index))); | |
1602 | ||
1603 | else | |
268aeaa9 | 1604 | Dims := UI_To_Int (Intval (E1)); |
996ae0b0 | 1605 | |
268aeaa9 | 1606 | for J in 1 .. Dims - 1 loop |
996ae0b0 RK |
1607 | Next_Index (Index); |
1608 | end loop; | |
1609 | ||
1610 | Set_Etype (N, Base_Type (Etype (Index))); | |
1611 | Set_Etype (E1, Standard_Integer); | |
1612 | end if; | |
1613 | end if; | |
1614 | end Check_Array_Or_Scalar_Type; | |
1615 | ||
1616 | ---------------------- | |
1617 | -- Check_Array_Type -- | |
1618 | ---------------------- | |
1619 | ||
1620 | procedure Check_Array_Type is | |
1621 | D : Int; | |
edd63e9b | 1622 | -- Dimension number for array attributes |
996ae0b0 RK |
1623 | |
1624 | begin | |
1625 | -- If the type is a string literal type, then this must be generated | |
1626 | -- internally, and no further check is required on its legality. | |
1627 | ||
1628 | if Ekind (P_Type) = E_String_Literal_Subtype then | |
1629 | return; | |
1630 | ||
1631 | -- If the type is a composite, it is an illegal aggregate, no point | |
1632 | -- in going on. | |
1633 | ||
1634 | elsif P_Type = Any_Composite then | |
1635 | raise Bad_Attribute; | |
1636 | end if; | |
1637 | ||
7cbdab5a ES |
1638 | -- Normal case of array type or subtype. Note that if the |
1639 | -- prefix is a current instance of a type declaration it | |
1640 | -- appears within an aspect specification and is legal. | |
996ae0b0 RK |
1641 | |
1642 | Check_Either_E0_Or_E1; | |
5453d5bd | 1643 | Check_Dereference; |
996ae0b0 RK |
1644 | |
1645 | if Is_Array_Type (P_Type) then | |
1646 | if not Is_Constrained (P_Type) | |
1647 | and then Is_Entity_Name (P) | |
1648 | and then Is_Type (Entity (P)) | |
7cbdab5a | 1649 | and then not Is_Current_Instance (P) |
996ae0b0 RK |
1650 | then |
1651 | -- Note: we do not call Error_Attr here, since we prefer to | |
1652 | -- continue, using the relevant index type of the array, | |
1653 | -- even though it is unconstrained. This gives better error | |
1654 | -- recovery behavior. | |
1655 | ||
1656 | Error_Msg_Name_1 := Aname; | |
822033eb | 1657 | Error_Msg_F |
996ae0b0 RK |
1658 | ("prefix for % attribute must be constrained array", P); |
1659 | end if; | |
1660 | ||
ca1ffed0 AC |
1661 | -- The attribute reference freezes the type, and thus the |
1662 | -- component type, even if the attribute may not depend on the | |
1663 | -- component. Diagnose arrays with incomplete components now. | |
1664 | -- If the prefix is an access to array, this does not freeze | |
1665 | -- the designated type. | |
1666 | ||
1667 | if Nkind (P) /= N_Explicit_Dereference then | |
1668 | Check_Fully_Declared (Component_Type (P_Type), P); | |
1669 | end if; | |
1670 | ||
996ae0b0 RK |
1671 | D := Number_Dimensions (P_Type); |
1672 | ||
996ae0b0 RK |
1673 | else |
1674 | if Is_Private_Type (P_Type) then | |
822033eb | 1675 | Error_Attr_P ("prefix for % attribute may not be private type"); |
996ae0b0 | 1676 | |
5453d5bd AC |
1677 | elsif Is_Access_Type (P_Type) |
1678 | and then Is_Array_Type (Designated_Type (P_Type)) | |
1679 | and then Is_Entity_Name (P) | |
1680 | and then Is_Type (Entity (P)) | |
1681 | then | |
822033eb | 1682 | Error_Attr_P ("prefix of % attribute cannot be access type"); |
5453d5bd | 1683 | |
996ae0b0 RK |
1684 | elsif Attr_Id = Attribute_First |
1685 | or else | |
1686 | Attr_Id = Attribute_Last | |
1687 | then | |
1688 | Error_Attr ("invalid prefix for % attribute", P); | |
1689 | ||
1690 | else | |
822033eb | 1691 | Error_Attr_P ("prefix for % attribute must be array"); |
996ae0b0 RK |
1692 | end if; |
1693 | end if; | |
1694 | ||
1695 | if Present (E1) then | |
1696 | Resolve (E1, Any_Integer); | |
1697 | Set_Etype (E1, Standard_Integer); | |
1698 | ||
edab6088 | 1699 | if not Is_OK_Static_Expression (E1) |
996ae0b0 RK |
1700 | or else Raises_Constraint_Error (E1) |
1701 | then | |
fbf5a39b AC |
1702 | Flag_Non_Static_Expr |
1703 | ("expression for dimension must be static!", E1); | |
1704 | Error_Attr; | |
996ae0b0 | 1705 | |
9fe696a3 | 1706 | elsif UI_To_Int (Expr_Value (E1)) > D |
996ae0b0 RK |
1707 | or else UI_To_Int (Expr_Value (E1)) < 1 |
1708 | then | |
1709 | Error_Attr ("invalid dimension number for array type", E1); | |
1710 | end if; | |
1711 | end if; | |
fea9e956 ES |
1712 | |
1713 | if (Style_Check and Style_Check_Array_Attribute_Index) | |
1714 | and then Comes_From_Source (N) | |
1715 | then | |
1716 | Style.Check_Array_Attribute_Index (N, E1, D); | |
1717 | end if; | |
996ae0b0 RK |
1718 | end Check_Array_Type; |
1719 | ||
1720 | ------------------------- | |
1721 | -- Check_Asm_Attribute -- | |
1722 | ------------------------- | |
1723 | ||
1724 | procedure Check_Asm_Attribute is | |
1725 | begin | |
1726 | Check_Type; | |
1727 | Check_E2; | |
1728 | ||
1729 | -- Check first argument is static string expression | |
1730 | ||
1731 | Analyze_And_Resolve (E1, Standard_String); | |
1732 | ||
1733 | if Etype (E1) = Any_Type then | |
1734 | return; | |
1735 | ||
1736 | elsif not Is_OK_Static_Expression (E1) then | |
fbf5a39b AC |
1737 | Flag_Non_Static_Expr |
1738 | ("constraint argument must be static string expression!", E1); | |
1739 | Error_Attr; | |
996ae0b0 RK |
1740 | end if; |
1741 | ||
1742 | -- Check second argument is right type | |
1743 | ||
1744 | Analyze_And_Resolve (E2, Entity (P)); | |
1745 | ||
1746 | -- Note: that is all we need to do, we don't need to check | |
1747 | -- that it appears in a correct context. The Ada type system | |
1748 | -- will do that for us. | |
1749 | ||
1750 | end Check_Asm_Attribute; | |
1751 | ||
1752 | --------------------- | |
1753 | -- Check_Component -- | |
1754 | --------------------- | |
1755 | ||
1756 | procedure Check_Component is | |
1757 | begin | |
1758 | Check_E0; | |
1759 | ||
1760 | if Nkind (P) /= N_Selected_Component | |
1761 | or else | |
1762 | (Ekind (Entity (Selector_Name (P))) /= E_Component | |
1763 | and then | |
1764 | Ekind (Entity (Selector_Name (P))) /= E_Discriminant) | |
1765 | then | |
822033eb | 1766 | Error_Attr_P ("prefix for % attribute must be selected component"); |
996ae0b0 RK |
1767 | end if; |
1768 | end Check_Component; | |
1769 | ||
1770 | ------------------------------------ | |
1771 | -- Check_Decimal_Fixed_Point_Type -- | |
1772 | ------------------------------------ | |
1773 | ||
1774 | procedure Check_Decimal_Fixed_Point_Type is | |
1775 | begin | |
1776 | Check_Type; | |
1777 | ||
1778 | if not Is_Decimal_Fixed_Point_Type (P_Type) then | |
822033eb | 1779 | Error_Attr_P ("prefix of % attribute must be decimal type"); |
996ae0b0 RK |
1780 | end if; |
1781 | end Check_Decimal_Fixed_Point_Type; | |
1782 | ||
1783 | ----------------------- | |
1784 | -- Check_Dereference -- | |
1785 | ----------------------- | |
1786 | ||
1787 | procedure Check_Dereference is | |
1788 | begin | |
6d11af89 AC |
1789 | |
1790 | -- Case of a subtype mark | |
1791 | ||
b285815e | 1792 | if Is_Entity_Name (P) and then Is_Type (Entity (P)) then |
6d11af89 AC |
1793 | return; |
1794 | end if; | |
1795 | ||
1796 | -- Case of an expression | |
1797 | ||
1798 | Resolve (P); | |
cc335f43 | 1799 | |
6d11af89 | 1800 | if Is_Access_Type (P_Type) then |
5453d5bd | 1801 | |
b285815e RD |
1802 | -- If there is an implicit dereference, then we must freeze the |
1803 | -- designated type of the access type, since the type of the | |
1804 | -- referenced array is this type (see AI95-00106). | |
b9262540 | 1805 | |
812e6118 | 1806 | -- As done elsewhere, freezing must not happen when preanalyzing |
b285815e RD |
1807 | -- a pre- or postcondition or a default value for an object or for |
1808 | -- a formal parameter. | |
5453d5bd | 1809 | |
3249690d AC |
1810 | if not In_Spec_Expression then |
1811 | Freeze_Before (N, Designated_Type (P_Type)); | |
1812 | end if; | |
5453d5bd | 1813 | |
996ae0b0 RK |
1814 | Rewrite (P, |
1815 | Make_Explicit_Dereference (Sloc (P), | |
1816 | Prefix => Relocate_Node (P))); | |
1817 | ||
1818 | Analyze_And_Resolve (P); | |
1819 | P_Type := Etype (P); | |
1820 | ||
1821 | if P_Type = Any_Type then | |
1822 | raise Bad_Attribute; | |
1823 | end if; | |
1824 | ||
1825 | P_Base_Type := Base_Type (P_Type); | |
996ae0b0 RK |
1826 | end if; |
1827 | end Check_Dereference; | |
1828 | ||
1829 | ------------------------- | |
1830 | -- Check_Discrete_Type -- | |
1831 | ------------------------- | |
1832 | ||
1833 | procedure Check_Discrete_Type is | |
1834 | begin | |
1835 | Check_Type; | |
1836 | ||
1837 | if not Is_Discrete_Type (P_Type) then | |
822033eb | 1838 | Error_Attr_P ("prefix of % attribute must be discrete type"); |
996ae0b0 RK |
1839 | end if; |
1840 | end Check_Discrete_Type; | |
1841 | ||
1842 | -------------- | |
1843 | -- Check_E0 -- | |
1844 | -------------- | |
1845 | ||
1846 | procedure Check_E0 is | |
1847 | begin | |
1848 | if Present (E1) then | |
1849 | Unexpected_Argument (E1); | |
1850 | end if; | |
1851 | end Check_E0; | |
1852 | ||
1853 | -------------- | |
1854 | -- Check_E1 -- | |
1855 | -------------- | |
1856 | ||
1857 | procedure Check_E1 is | |
1858 | begin | |
1859 | Check_Either_E0_Or_E1; | |
1860 | ||
1861 | if No (E1) then | |
1862 | ||
1863 | -- Special-case attributes that are functions and that appear as | |
1864 | -- the prefix of another attribute. Error is posted on parent. | |
1865 | ||
1866 | if Nkind (Parent (N)) = N_Attribute_Reference | |
b69cd36a AC |
1867 | and then Nam_In (Attribute_Name (Parent (N)), Name_Address, |
1868 | Name_Code_Address, | |
1869 | Name_Access) | |
996ae0b0 RK |
1870 | then |
1871 | Error_Msg_Name_1 := Attribute_Name (Parent (N)); | |
1872 | Error_Msg_N ("illegal prefix for % attribute", Parent (N)); | |
1873 | Set_Etype (Parent (N), Any_Type); | |
1874 | Set_Entity (Parent (N), Any_Type); | |
1875 | raise Bad_Attribute; | |
1876 | ||
1877 | else | |
1878 | Error_Attr ("missing argument for % attribute", N); | |
1879 | end if; | |
1880 | end if; | |
1881 | end Check_E1; | |
1882 | ||
1883 | -------------- | |
1884 | -- Check_E2 -- | |
1885 | -------------- | |
1886 | ||
1887 | procedure Check_E2 is | |
1888 | begin | |
1889 | if No (E1) then | |
1890 | Error_Attr ("missing arguments for % attribute (2 required)", N); | |
1891 | elsif No (E2) then | |
1892 | Error_Attr ("missing argument for % attribute (2 required)", N); | |
1893 | end if; | |
1894 | end Check_E2; | |
1895 | ||
1896 | --------------------------- | |
1897 | -- Check_Either_E0_Or_E1 -- | |
1898 | --------------------------- | |
1899 | ||
1900 | procedure Check_Either_E0_Or_E1 is | |
1901 | begin | |
1902 | if Present (E2) then | |
1903 | Unexpected_Argument (E2); | |
1904 | end if; | |
1905 | end Check_Either_E0_Or_E1; | |
1906 | ||
1907 | ---------------------- | |
1908 | -- Check_Enum_Image -- | |
1909 | ---------------------- | |
1910 | ||
1911 | procedure Check_Enum_Image is | |
1912 | Lit : Entity_Id; | |
3e7302c3 | 1913 | |
996ae0b0 | 1914 | begin |
3e7302c3 AC |
1915 | -- When an enumeration type appears in an attribute reference, all |
1916 | -- literals of the type are marked as referenced. This must only be | |
1917 | -- done if the attribute reference appears in the current source. | |
1918 | -- Otherwise the information on references may differ between a | |
1919 | -- normal compilation and one that performs inlining. | |
1920 | ||
8097203f AC |
1921 | if Is_Enumeration_Type (P_Base_Type) |
1922 | and then In_Extended_Main_Code_Unit (N) | |
1923 | then | |
996ae0b0 RK |
1924 | Lit := First_Literal (P_Base_Type); |
1925 | while Present (Lit) loop | |
1926 | Set_Referenced (Lit); | |
1927 | Next_Literal (Lit); | |
1928 | end loop; | |
1929 | end if; | |
1930 | end Check_Enum_Image; | |
1931 | ||
011f9d5d AC |
1932 | ---------------------------- |
1933 | -- Check_First_Last_Valid -- | |
1934 | ---------------------------- | |
1935 | ||
1936 | procedure Check_First_Last_Valid is | |
1937 | begin | |
011f9d5d AC |
1938 | Check_Discrete_Type; |
1939 | ||
2a1b208c RD |
1940 | -- Freeze the subtype now, so that the following test for predicates |
1941 | -- works (we set the predicates stuff up at freeze time) | |
1942 | ||
1943 | Insert_Actions (N, Freeze_Entity (P_Type, P)); | |
1944 | ||
1945 | -- Now test for dynamic predicate | |
011f9d5d AC |
1946 | |
1947 | if Has_Predicates (P_Type) | |
60f908dd | 1948 | and then not (Has_Static_Predicate (P_Type)) |
011f9d5d AC |
1949 | then |
1950 | Error_Attr_P | |
1951 | ("prefix of % attribute may not have dynamic predicate"); | |
1952 | end if; | |
1953 | ||
2a1b208c RD |
1954 | -- Check non-static subtype |
1955 | ||
edab6088 | 1956 | if not Is_OK_Static_Subtype (P_Type) then |
2a1b208c RD |
1957 | Error_Attr_P ("prefix of % attribute must be a static subtype"); |
1958 | end if; | |
1959 | ||
1960 | -- Test case for no values | |
1961 | ||
011f9d5d AC |
1962 | if Expr_Value (Type_Low_Bound (P_Type)) > |
1963 | Expr_Value (Type_High_Bound (P_Type)) | |
1964 | or else (Has_Predicates (P_Type) | |
60f908dd RD |
1965 | and then |
1966 | Is_Empty_List (Static_Discrete_Predicate (P_Type))) | |
011f9d5d AC |
1967 | then |
1968 | Error_Attr_P | |
a905304c AC |
1969 | ("prefix of % attribute must be subtype with at least one " |
1970 | & "value"); | |
011f9d5d AC |
1971 | end if; |
1972 | end Check_First_Last_Valid; | |
1973 | ||
996ae0b0 RK |
1974 | ---------------------------- |
1975 | -- Check_Fixed_Point_Type -- | |
1976 | ---------------------------- | |
1977 | ||
1978 | procedure Check_Fixed_Point_Type is | |
1979 | begin | |
1980 | Check_Type; | |
1981 | ||
1982 | if not Is_Fixed_Point_Type (P_Type) then | |
822033eb | 1983 | Error_Attr_P ("prefix of % attribute must be fixed point type"); |
996ae0b0 RK |
1984 | end if; |
1985 | end Check_Fixed_Point_Type; | |
1986 | ||
1987 | ------------------------------ | |
1988 | -- Check_Fixed_Point_Type_0 -- | |
1989 | ------------------------------ | |
1990 | ||
1991 | procedure Check_Fixed_Point_Type_0 is | |
1992 | begin | |
1993 | Check_Fixed_Point_Type; | |
1994 | Check_E0; | |
1995 | end Check_Fixed_Point_Type_0; | |
1996 | ||
1997 | ------------------------------- | |
1998 | -- Check_Floating_Point_Type -- | |
1999 | ------------------------------- | |
2000 | ||
2001 | procedure Check_Floating_Point_Type is | |
2002 | begin | |
2003 | Check_Type; | |
2004 | ||
2005 | if not Is_Floating_Point_Type (P_Type) then | |
822033eb | 2006 | Error_Attr_P ("prefix of % attribute must be float type"); |
996ae0b0 RK |
2007 | end if; |
2008 | end Check_Floating_Point_Type; | |
2009 | ||
2010 | --------------------------------- | |
2011 | -- Check_Floating_Point_Type_0 -- | |
2012 | --------------------------------- | |
2013 | ||
2014 | procedure Check_Floating_Point_Type_0 is | |
2015 | begin | |
2016 | Check_Floating_Point_Type; | |
2017 | Check_E0; | |
2018 | end Check_Floating_Point_Type_0; | |
2019 | ||
2020 | --------------------------------- | |
2021 | -- Check_Floating_Point_Type_1 -- | |
2022 | --------------------------------- | |
2023 | ||
2024 | procedure Check_Floating_Point_Type_1 is | |
2025 | begin | |
2026 | Check_Floating_Point_Type; | |
2027 | Check_E1; | |
2028 | end Check_Floating_Point_Type_1; | |
2029 | ||
2030 | --------------------------------- | |
2031 | -- Check_Floating_Point_Type_2 -- | |
2032 | --------------------------------- | |
2033 | ||
2034 | procedure Check_Floating_Point_Type_2 is | |
2035 | begin | |
2036 | Check_Floating_Point_Type; | |
2037 | Check_E2; | |
2038 | end Check_Floating_Point_Type_2; | |
2039 | ||
2040 | ------------------------ | |
2041 | -- Check_Integer_Type -- | |
2042 | ------------------------ | |
2043 | ||
2044 | procedure Check_Integer_Type is | |
2045 | begin | |
2046 | Check_Type; | |
2047 | ||
2048 | if not Is_Integer_Type (P_Type) then | |
822033eb | 2049 | Error_Attr_P ("prefix of % attribute must be integer type"); |
996ae0b0 RK |
2050 | end if; |
2051 | end Check_Integer_Type; | |
2052 | ||
5f3ab6fb AC |
2053 | -------------------------------- |
2054 | -- Check_Modular_Integer_Type -- | |
2055 | -------------------------------- | |
2056 | ||
2057 | procedure Check_Modular_Integer_Type is | |
2058 | begin | |
2059 | Check_Type; | |
2060 | ||
2061 | if not Is_Modular_Integer_Type (P_Type) then | |
822033eb HK |
2062 | Error_Attr_P |
2063 | ("prefix of % attribute must be modular integer type"); | |
5f3ab6fb AC |
2064 | end if; |
2065 | end Check_Modular_Integer_Type; | |
2066 | ||
21d27997 RD |
2067 | ------------------------ |
2068 | -- Check_Not_CPP_Type -- | |
2069 | ------------------------ | |
2070 | ||
2071 | procedure Check_Not_CPP_Type is | |
2072 | begin | |
2073 | if Is_Tagged_Type (Etype (P)) | |
2074 | and then Convention (Etype (P)) = Convention_CPP | |
2075 | and then Is_CPP_Class (Root_Type (Etype (P))) | |
2076 | then | |
7052f54e KP |
2077 | Error_Attr_P |
2078 | ("invalid use of % attribute with 'C'P'P tagged type"); | |
21d27997 RD |
2079 | end if; |
2080 | end Check_Not_CPP_Type; | |
2081 | ||
996ae0b0 RK |
2082 | ------------------------------- |
2083 | -- Check_Not_Incomplete_Type -- | |
2084 | ------------------------------- | |
2085 | ||
2086 | procedure Check_Not_Incomplete_Type is | |
d8db0bca JM |
2087 | E : Entity_Id; |
2088 | Typ : Entity_Id; | |
2089 | ||
996ae0b0 | 2090 | begin |
d8db0bca JM |
2091 | -- Ada 2005 (AI-50217, AI-326): If the prefix is an explicit |
2092 | -- dereference we have to check wrong uses of incomplete types | |
2093 | -- (other wrong uses are checked at their freezing point). | |
2094 | ||
22efcab7 AC |
2095 | -- In Ada 2012, incomplete types can appear in subprogram |
2096 | -- profiles, but formals with incomplete types cannot be the | |
2097 | -- prefix of attributes. | |
2098 | ||
d8db0bca JM |
2099 | -- Example 1: Limited-with |
2100 | ||
2101 | -- limited with Pkg; | |
2102 | -- package P is | |
2103 | -- type Acc is access Pkg.T; | |
2104 | -- X : Acc; | |
2105 | -- S : Integer := X.all'Size; -- ERROR | |
2106 | -- end P; | |
2107 | ||
2108 | -- Example 2: Tagged incomplete | |
2109 | ||
2110 | -- type T is tagged; | |
2111 | -- type Acc is access all T; | |
2112 | -- X : Acc; | |
2113 | -- S : constant Integer := X.all'Size; -- ERROR | |
2114 | -- procedure Q (Obj : Integer := X.all'Alignment); -- ERROR | |
2115 | ||
0791fbe9 | 2116 | if Ada_Version >= Ada_2005 |
d8db0bca JM |
2117 | and then Nkind (P) = N_Explicit_Dereference |
2118 | then | |
2119 | E := P; | |
2120 | while Nkind (E) = N_Explicit_Dereference loop | |
2121 | E := Prefix (E); | |
2122 | end loop; | |
2123 | ||
c0985d4e HK |
2124 | Typ := Etype (E); |
2125 | ||
7b56a91b | 2126 | if From_Limited_With (Typ) then |
822033eb HK |
2127 | Error_Attr_P |
2128 | ("prefix of % attribute cannot be an incomplete type"); | |
d8db0bca | 2129 | |
22efcab7 | 2130 | -- If the prefix is an access type check the designated type |
c0985d4e | 2131 | |
22efcab7 AC |
2132 | elsif Is_Access_Type (Typ) |
2133 | and then Nkind (P) = N_Explicit_Dereference | |
2134 | then | |
2135 | Typ := Directly_Designated_Type (Typ); | |
2136 | end if; | |
2137 | ||
2138 | if Is_Class_Wide_Type (Typ) then | |
2139 | Typ := Root_Type (Typ); | |
2140 | end if; | |
2141 | ||
2142 | -- A legal use of a shadow entity occurs only when the unit where | |
2143 | -- the non-limited view resides is imported via a regular with | |
2144 | -- clause in the current body. Such references to shadow entities | |
2145 | -- may occur in subprogram formals. | |
2146 | ||
2147 | if Is_Incomplete_Type (Typ) | |
2148 | and then From_Limited_With (Typ) | |
2149 | and then Present (Non_Limited_View (Typ)) | |
2150 | and then Is_Legal_Shadow_Entity_In_Body (Typ) | |
2151 | then | |
2152 | Typ := Non_Limited_View (Typ); | |
2153 | end if; | |
c0985d4e | 2154 | |
22efcab7 AC |
2155 | -- If still incomplete, it can be a local incomplete type, or a |
2156 | -- limited view whose scope is also a limited view. | |
c0985d4e | 2157 | |
22efcab7 AC |
2158 | if Ekind (Typ) = E_Incomplete_Type then |
2159 | if not From_Limited_With (Typ) | |
2160 | and then No (Full_View (Typ)) | |
c0985d4e | 2161 | then |
22efcab7 AC |
2162 | Error_Attr_P |
2163 | ("prefix of % attribute cannot be an incomplete type"); | |
d8db0bca | 2164 | |
22efcab7 AC |
2165 | -- The limited view may be available indirectly through |
2166 | -- an intermediate unit. If the non-limited view is available | |
2167 | -- the attribute reference is legal. | |
2168 | ||
2169 | elsif From_Limited_With (Typ) | |
2170 | and then | |
2171 | (No (Non_Limited_View (Typ)) | |
2172 | or else Is_Incomplete_Type (Non_Limited_View (Typ))) | |
d8db0bca | 2173 | then |
822033eb HK |
2174 | Error_Attr_P |
2175 | ("prefix of % attribute cannot be an incomplete type"); | |
d8db0bca JM |
2176 | end if; |
2177 | end if; | |
22efcab7 AC |
2178 | |
2179 | -- Ada 2012 : formals in bodies may be incomplete, but no attribute | |
2180 | -- legally applies. | |
2181 | ||
2182 | elsif Is_Entity_Name (P) | |
2183 | and then Is_Formal (Entity (P)) | |
2184 | and then Is_Incomplete_Type (Etype (Etype (P))) | |
2185 | then | |
2186 | Error_Attr_P | |
2187 | ("prefix of % attribute cannot be an incomplete type"); | |
d8db0bca JM |
2188 | end if; |
2189 | ||
996ae0b0 RK |
2190 | if not Is_Entity_Name (P) |
2191 | or else not Is_Type (Entity (P)) | |
21d27997 | 2192 | or else In_Spec_Expression |
996ae0b0 RK |
2193 | then |
2194 | return; | |
996ae0b0 RK |
2195 | else |
2196 | Check_Fully_Declared (P_Type, P); | |
2197 | end if; | |
2198 | end Check_Not_Incomplete_Type; | |
2199 | ||
2200 | ---------------------------- | |
2201 | -- Check_Object_Reference -- | |
2202 | ---------------------------- | |
2203 | ||
2204 | procedure Check_Object_Reference (P : Node_Id) is | |
2205 | Rtyp : Entity_Id; | |
2206 | ||
2207 | begin | |
f16cb8df HK |
2208 | -- If we need an object, and we have a prefix that is the name of a |
2209 | -- function entity, convert it into a function call. | |
996ae0b0 RK |
2210 | |
2211 | if Is_Entity_Name (P) | |
2212 | and then Ekind (Entity (P)) = E_Function | |
2213 | then | |
2214 | Rtyp := Etype (Entity (P)); | |
2215 | ||
2216 | Rewrite (P, | |
2217 | Make_Function_Call (Sloc (P), | |
2218 | Name => Relocate_Node (P))); | |
2219 | ||
2220 | Analyze_And_Resolve (P, Rtyp); | |
2221 | ||
2222 | -- Otherwise we must have an object reference | |
2223 | ||
2224 | elsif not Is_Object_Reference (P) then | |
822033eb | 2225 | Error_Attr_P ("prefix of % attribute must be object"); |
996ae0b0 RK |
2226 | end if; |
2227 | end Check_Object_Reference; | |
2228 | ||
54838d1f AC |
2229 | ---------------------------- |
2230 | -- Check_PolyORB_Attribute -- | |
2231 | ---------------------------- | |
2232 | ||
2233 | procedure Check_PolyORB_Attribute is | |
2234 | begin | |
2235 | Validate_Non_Static_Attribute_Function_Call; | |
2236 | ||
2237 | Check_Type; | |
2238 | Check_Not_CPP_Type; | |
2239 | ||
2240 | if Get_PCS_Name /= Name_PolyORB_DSA then | |
2241 | Error_Attr | |
2242 | ("attribute% requires the 'Poly'O'R'B 'P'C'S", N); | |
2243 | end if; | |
2244 | end Check_PolyORB_Attribute; | |
2245 | ||
996ae0b0 RK |
2246 | ------------------------ |
2247 | -- Check_Program_Unit -- | |
2248 | ------------------------ | |
2249 | ||
2250 | procedure Check_Program_Unit is | |
2251 | begin | |
2252 | if Is_Entity_Name (P) then | |
2253 | declare | |
2254 | K : constant Entity_Kind := Ekind (Entity (P)); | |
2255 | T : constant Entity_Id := Etype (Entity (P)); | |
2256 | ||
2257 | begin | |
2258 | if K in Subprogram_Kind | |
2259 | or else K in Task_Kind | |
2260 | or else K in Protected_Kind | |
2261 | or else K = E_Package | |
2262 | or else K in Generic_Unit_Kind | |
2263 | or else (K = E_Variable | |
2264 | and then | |
2265 | (Is_Task_Type (T) | |
2266 | or else | |
2267 | Is_Protected_Type (T))) | |
2268 | then | |
2269 | return; | |
2270 | end if; | |
2271 | end; | |
2272 | end if; | |
2273 | ||
822033eb | 2274 | Error_Attr_P ("prefix of % attribute must be program unit"); |
996ae0b0 RK |
2275 | end Check_Program_Unit; |
2276 | ||
2277 | --------------------- | |
2278 | -- Check_Real_Type -- | |
2279 | --------------------- | |
2280 | ||
2281 | procedure Check_Real_Type is | |
2282 | begin | |
2283 | Check_Type; | |
2284 | ||
2285 | if not Is_Real_Type (P_Type) then | |
822033eb | 2286 | Error_Attr_P ("prefix of % attribute must be real type"); |
996ae0b0 RK |
2287 | end if; |
2288 | end Check_Real_Type; | |
2289 | ||
2290 | ----------------------- | |
2291 | -- Check_Scalar_Type -- | |
2292 | ----------------------- | |
2293 | ||
2294 | procedure Check_Scalar_Type is | |
2295 | begin | |
2296 | Check_Type; | |
2297 | ||
2298 | if not Is_Scalar_Type (P_Type) then | |
822033eb | 2299 | Error_Attr_P ("prefix of % attribute must be scalar type"); |
996ae0b0 RK |
2300 | end if; |
2301 | end Check_Scalar_Type; | |
2302 | ||
e917aec2 | 2303 | ------------------------------------------ |
ce5ba43a | 2304 | -- Check_SPARK_05_Restriction_On_Attribute -- |
e917aec2 RD |
2305 | ------------------------------------------ |
2306 | ||
ce5ba43a | 2307 | procedure Check_SPARK_05_Restriction_On_Attribute is |
e917aec2 RD |
2308 | begin |
2309 | Error_Msg_Name_1 := Aname; | |
ce5ba43a AC |
2310 | Check_SPARK_05_Restriction ("attribute % is not allowed", P); |
2311 | end Check_SPARK_05_Restriction_On_Attribute; | |
e917aec2 | 2312 | |
996ae0b0 RK |
2313 | --------------------------- |
2314 | -- Check_Standard_Prefix -- | |
2315 | --------------------------- | |
2316 | ||
2317 | procedure Check_Standard_Prefix is | |
2318 | begin | |
2319 | Check_E0; | |
2320 | ||
2cbac6c6 | 2321 | if Nkind (P) /= N_Identifier or else Chars (P) /= Name_Standard then |
996ae0b0 RK |
2322 | Error_Attr ("only allowed prefix for % attribute is Standard", P); |
2323 | end if; | |
996ae0b0 RK |
2324 | end Check_Standard_Prefix; |
2325 | ||
2326 | ---------------------------- | |
2327 | -- Check_Stream_Attribute -- | |
2328 | ---------------------------- | |
2329 | ||
fbf5a39b | 2330 | procedure Check_Stream_Attribute (Nam : TSS_Name_Type) is |
996ae0b0 RK |
2331 | Etyp : Entity_Id; |
2332 | Btyp : Entity_Id; | |
468c6c8a | 2333 | |
7052f54e | 2334 | In_Shared_Var_Procs : Boolean; |
2cbac6c6 AC |
2335 | -- True when compiling System.Shared_Storage.Shared_Var_Procs body. |
2336 | -- For this runtime package (always compiled in GNAT mode), we allow | |
2337 | -- stream attributes references for limited types for the case where | |
2338 | -- shared passive objects are implemented using stream attributes, | |
2339 | -- which is the default in GNAT's persistent storage implementation. | |
7052f54e | 2340 | |
996ae0b0 RK |
2341 | begin |
2342 | Validate_Non_Static_Attribute_Function_Call; | |
2343 | ||
2344 | -- With the exception of 'Input, Stream attributes are procedures, | |
2345 | -- and can only appear at the position of procedure calls. We check | |
2346 | -- for this here, before they are rewritten, to give a more precise | |
2347 | -- diagnostic. | |
2348 | ||
fbf5a39b | 2349 | if Nam = TSS_Stream_Input then |
996ae0b0 RK |
2350 | null; |
2351 | ||
2352 | elsif Is_List_Member (N) | |
e10dab7f JM |
2353 | and then not Nkind_In (Parent (N), N_Procedure_Call_Statement, |
2354 | N_Aggregate) | |
996ae0b0 RK |
2355 | then |
2356 | null; | |
2357 | ||
2358 | else | |
2359 | Error_Attr | |
fbf5a39b | 2360 | ("invalid context for attribute%, which is a procedure", N); |
996ae0b0 RK |
2361 | end if; |
2362 | ||
2363 | Check_Type; | |
2364 | Btyp := Implementation_Base_Type (P_Type); | |
2365 | ||
2366 | -- Stream attributes not allowed on limited types unless the | |
d2d3604c TQ |
2367 | -- attribute reference was generated by the expander (in which |
2368 | -- case the underlying type will be used, as described in Sinfo), | |
2369 | -- or the attribute was specified explicitly for the type itself | |
edd63e9b ES |
2370 | -- or one of its ancestors (taking visibility rules into account if |
2371 | -- in Ada 2005 mode), or a pragma Stream_Convert applies to Btyp | |
2372 | -- (with no visibility restriction). | |
996ae0b0 | 2373 | |
7052f54e KP |
2374 | declare |
2375 | Gen_Body : constant Node_Id := Enclosing_Generic_Body (N); | |
2376 | begin | |
2377 | if Present (Gen_Body) then | |
2378 | In_Shared_Var_Procs := | |
2379 | Is_RTE (Corresponding_Spec (Gen_Body), RE_Shared_Var_Procs); | |
2380 | else | |
2381 | In_Shared_Var_Procs := False; | |
2382 | end if; | |
2383 | end; | |
2384 | ||
2385 | if (Comes_From_Source (N) | |
2386 | and then not (In_Shared_Var_Procs or In_Instance)) | |
edd63e9b | 2387 | and then not Stream_Attribute_Available (P_Type, Nam) |
1d571f3b | 2388 | and then not Has_Rep_Pragma (Btyp, Name_Stream_Convert) |
996ae0b0 | 2389 | then |
fbf5a39b | 2390 | Error_Msg_Name_1 := Aname; |
edd63e9b ES |
2391 | |
2392 | if Is_Limited_Type (P_Type) then | |
2393 | Error_Msg_NE | |
2394 | ("limited type& has no% attribute", P, P_Type); | |
2395 | Explain_Limited_Type (P_Type, P); | |
2396 | else | |
2397 | Error_Msg_NE | |
2398 | ("attribute% for type& is not available", P, P_Type); | |
2399 | end if; | |
fbf5a39b | 2400 | end if; |
996ae0b0 | 2401 | |
49d41397 RD |
2402 | -- Check for no stream operations allowed from No_Tagged_Streams |
2403 | ||
2404 | if Is_Tagged_Type (P_Type) | |
2405 | and then Present (No_Tagged_Streams_Pragma (P_Type)) | |
2406 | then | |
2407 | Error_Msg_Sloc := Sloc (No_Tagged_Streams_Pragma (P_Type)); | |
2408 | Error_Msg_NE | |
2409 | ("no stream operations for & (No_Tagged_Streams #)", N, P_Type); | |
2410 | return; | |
2411 | end if; | |
2412 | ||
95b89f1b AC |
2413 | -- Check restriction violations |
2414 | ||
93bcda23 AC |
2415 | -- First check the No_Streams restriction, which prohibits the use |
2416 | -- of explicit stream attributes in the source program. We do not | |
2417 | -- prevent the occurrence of stream attributes in generated code, | |
2418 | -- for instance those generated implicitly for dispatching purposes. | |
2419 | ||
2420 | if Comes_From_Source (N) then | |
2421 | Check_Restriction (No_Streams, P); | |
2422 | end if; | |
2423 | ||
276e7ed0 AC |
2424 | -- AI05-0057: if restriction No_Default_Stream_Attributes is active, |
2425 | -- it is illegal to use a predefined elementary type stream attribute | |
2426 | -- either by itself, or more importantly as part of the attribute | |
beaa97ab AC |
2427 | -- subprogram for a composite type. However, if the broader |
2428 | -- restriction No_Streams is active, stream operations are not | |
2429 | -- generated, and there is no error. | |
276e7ed0 | 2430 | |
beaa97ab AC |
2431 | if Restriction_Active (No_Default_Stream_Attributes) |
2432 | and then not Restriction_Active (No_Streams) | |
2433 | then | |
276e7ed0 AC |
2434 | declare |
2435 | T : Entity_Id; | |
9aff36e9 | 2436 | |
276e7ed0 AC |
2437 | begin |
2438 | if Nam = TSS_Stream_Input | |
9aff36e9 RD |
2439 | or else |
2440 | Nam = TSS_Stream_Read | |
276e7ed0 AC |
2441 | then |
2442 | T := | |
2443 | Type_Without_Stream_Operation (P_Type, TSS_Stream_Read); | |
2444 | else | |
2445 | T := | |
2446 | Type_Without_Stream_Operation (P_Type, TSS_Stream_Write); | |
2447 | end if; | |
2448 | ||
2449 | if Present (T) then | |
2450 | Check_Restriction (No_Default_Stream_Attributes, N); | |
2451 | ||
2452 | Error_Msg_NE | |
2453 | ("missing user-defined Stream Read or Write for type&", | |
2454 | N, T); | |
2455 | if not Is_Elementary_Type (P_Type) then | |
2456 | Error_Msg_NE | |
2457 | ("\which is a component of type&", N, P_Type); | |
2458 | end if; | |
2459 | end if; | |
2460 | end; | |
2461 | end if; | |
2462 | ||
93bcda23 | 2463 | -- Check special case of Exception_Id and Exception_Occurrence which |
308e6f3a | 2464 | -- are not allowed for restriction No_Exception_Registration. |
fbf5a39b | 2465 | |
273adcdf AC |
2466 | if Restriction_Check_Required (No_Exception_Registration) |
2467 | and then (Is_RTE (P_Type, RE_Exception_Id) | |
2468 | or else | |
2469 | Is_RTE (P_Type, RE_Exception_Occurrence)) | |
fbf5a39b AC |
2470 | then |
2471 | Check_Restriction (No_Exception_Registration, P); | |
996ae0b0 RK |
2472 | end if; |
2473 | ||
2474 | -- Here we must check that the first argument is an access type | |
2475 | -- that is compatible with Ada.Streams.Root_Stream_Type'Class. | |
2476 | ||
2477 | Analyze_And_Resolve (E1); | |
2478 | Etyp := Etype (E1); | |
2479 | ||
2480 | -- Note: the double call to Root_Type here is needed because the | |
2481 | -- root type of a class-wide type is the corresponding type (e.g. | |
fea9e956 | 2482 | -- X for X'Class, and we really want to go to the root.) |
996ae0b0 RK |
2483 | |
2484 | if not Is_Access_Type (Etyp) | |
2485 | or else Root_Type (Root_Type (Designated_Type (Etyp))) /= | |
2486 | RTE (RE_Root_Stream_Type) | |
2487 | then | |
2488 | Error_Attr | |
2489 | ("expected access to Ada.Streams.Root_Stream_Type''Class", E1); | |
2490 | end if; | |
2491 | ||
2492 | -- Check that the second argument is of the right type if there is | |
2493 | -- one (the Input attribute has only one argument so this is skipped) | |
2494 | ||
2495 | if Present (E2) then | |
2496 | Analyze (E2); | |
2497 | ||
fbf5a39b | 2498 | if Nam = TSS_Stream_Read |
996ae0b0 RK |
2499 | and then not Is_OK_Variable_For_Out_Formal (E2) |
2500 | then | |
2501 | Error_Attr | |
2502 | ("second argument of % attribute must be a variable", E2); | |
2503 | end if; | |
2504 | ||
2505 | Resolve (E2, P_Type); | |
2506 | end if; | |
21d27997 RD |
2507 | |
2508 | Check_Not_CPP_Type; | |
996ae0b0 RK |
2509 | end Check_Stream_Attribute; |
2510 | ||
f7ea2603 RD |
2511 | ------------------------- |
2512 | -- Check_System_Prefix -- | |
2513 | ------------------------- | |
2514 | ||
2515 | procedure Check_System_Prefix is | |
2516 | begin | |
2517 | if Nkind (P) /= N_Identifier or else Chars (P) /= Name_System then | |
2518 | Error_Attr ("only allowed prefix for % attribute is System", P); | |
2519 | end if; | |
2520 | end Check_System_Prefix; | |
2521 | ||
996ae0b0 RK |
2522 | ----------------------- |
2523 | -- Check_Task_Prefix -- | |
2524 | ----------------------- | |
2525 | ||
2526 | procedure Check_Task_Prefix is | |
2527 | begin | |
2528 | Analyze (P); | |
2529 | ||
65f01153 RD |
2530 | -- Ada 2005 (AI-345): Attribute 'Terminated can be applied to |
2531 | -- task interface class-wide types. | |
2532 | ||
996ae0b0 RK |
2533 | if Is_Task_Type (Etype (P)) |
2534 | or else (Is_Access_Type (Etype (P)) | |
65f01153 | 2535 | and then Is_Task_Type (Designated_Type (Etype (P)))) |
0791fbe9 | 2536 | or else (Ada_Version >= Ada_2005 |
65f01153 RD |
2537 | and then Ekind (Etype (P)) = E_Class_Wide_Type |
2538 | and then Is_Interface (Etype (P)) | |
2539 | and then Is_Task_Interface (Etype (P))) | |
996ae0b0 | 2540 | then |
fbf5a39b | 2541 | Resolve (P); |
65f01153 | 2542 | |
996ae0b0 | 2543 | else |
0791fbe9 | 2544 | if Ada_Version >= Ada_2005 then |
822033eb HK |
2545 | Error_Attr_P |
2546 | ("prefix of % attribute must be a task or a task " & | |
2547 | "interface class-wide object"); | |
65f01153 RD |
2548 | |
2549 | else | |
822033eb | 2550 | Error_Attr_P ("prefix of % attribute must be a task"); |
65f01153 | 2551 | end if; |
996ae0b0 RK |
2552 | end if; |
2553 | end Check_Task_Prefix; | |
2554 | ||
2555 | ---------------- | |
2556 | -- Check_Type -- | |
2557 | ---------------- | |
2558 | ||
2559 | -- The possibilities are an entity name denoting a type, or an | |
2560 | -- attribute reference that denotes a type (Base or Class). If | |
2561 | -- the type is incomplete, replace it with its full view. | |
2562 | ||
2563 | procedure Check_Type is | |
2564 | begin | |
2565 | if not Is_Entity_Name (P) | |
2566 | or else not Is_Type (Entity (P)) | |
2567 | then | |
822033eb | 2568 | Error_Attr_P ("prefix of % attribute must be a type"); |
996ae0b0 | 2569 | |
2d14501c ST |
2570 | elsif Is_Protected_Self_Reference (P) then |
2571 | Error_Attr_P | |
ae8c7d87 RD |
2572 | ("prefix of % attribute denotes current instance " |
2573 | & "(RM 9.4(21/2))"); | |
2d14501c | 2574 | |
996ae0b0 RK |
2575 | elsif Ekind (Entity (P)) = E_Incomplete_Type |
2576 | and then Present (Full_View (Entity (P))) | |
2577 | then | |
2578 | P_Type := Full_View (Entity (P)); | |
2579 | Set_Entity (P, P_Type); | |
2580 | end if; | |
2581 | end Check_Type; | |
2582 | ||
2583 | --------------------- | |
2584 | -- Check_Unit_Name -- | |
2585 | --------------------- | |
2586 | ||
2587 | procedure Check_Unit_Name (Nod : Node_Id) is | |
2588 | begin | |
2589 | if Nkind (Nod) = N_Identifier then | |
2590 | return; | |
2591 | ||
2c1b72d7 | 2592 | elsif Nkind_In (Nod, N_Selected_Component, N_Expanded_Name) then |
996ae0b0 RK |
2593 | Check_Unit_Name (Prefix (Nod)); |
2594 | ||
2595 | if Nkind (Selector_Name (Nod)) = N_Identifier then | |
2596 | return; | |
2597 | end if; | |
2598 | end if; | |
2599 | ||
2600 | Error_Attr ("argument for % attribute must be unit name", P); | |
2601 | end Check_Unit_Name; | |
2602 | ||
2603 | ---------------- | |
2604 | -- Error_Attr -- | |
2605 | ---------------- | |
2606 | ||
fbf5a39b | 2607 | procedure Error_Attr is |
996ae0b0 | 2608 | begin |
f16cb8df | 2609 | Set_Etype (N, Any_Type); |
996ae0b0 RK |
2610 | Set_Entity (N, Any_Type); |
2611 | raise Bad_Attribute; | |
2612 | end Error_Attr; | |
2613 | ||
fbf5a39b AC |
2614 | procedure Error_Attr (Msg : String; Error_Node : Node_Id) is |
2615 | begin | |
2616 | Error_Msg_Name_1 := Aname; | |
2617 | Error_Msg_N (Msg, Error_Node); | |
2618 | Error_Attr; | |
2619 | end Error_Attr; | |
2620 | ||
822033eb HK |
2621 | ------------------ |
2622 | -- Error_Attr_P -- | |
2623 | ------------------ | |
2624 | ||
2625 | procedure Error_Attr_P (Msg : String) is | |
2626 | begin | |
2627 | Error_Msg_Name_1 := Aname; | |
2628 | Error_Msg_F (Msg, P); | |
2629 | Error_Attr; | |
2630 | end Error_Attr_P; | |
2631 | ||
996ae0b0 RK |
2632 | ---------------------------- |
2633 | -- Legal_Formal_Attribute -- | |
2634 | ---------------------------- | |
2635 | ||
2636 | procedure Legal_Formal_Attribute is | |
2637 | begin | |
2638 | Check_E0; | |
2639 | ||
2640 | if not Is_Entity_Name (P) | |
2641 | or else not Is_Type (Entity (P)) | |
2642 | then | |
822033eb | 2643 | Error_Attr_P ("prefix of % attribute must be generic type"); |
996ae0b0 RK |
2644 | |
2645 | elsif Is_Generic_Actual_Type (Entity (P)) | |
efdfd311 AC |
2646 | or else In_Instance |
2647 | or else In_Inlined_Body | |
996ae0b0 RK |
2648 | then |
2649 | null; | |
2650 | ||
2651 | elsif Is_Generic_Type (Entity (P)) then | |
83496138 | 2652 | if Is_Definite_Subtype (Entity (P)) then |
822033eb HK |
2653 | Error_Attr_P |
2654 | ("prefix of % attribute must be indefinite generic type"); | |
996ae0b0 RK |
2655 | end if; |
2656 | ||
2657 | else | |
822033eb HK |
2658 | Error_Attr_P |
2659 | ("prefix of % attribute must be indefinite generic type"); | |
996ae0b0 RK |
2660 | end if; |
2661 | ||
2662 | Set_Etype (N, Standard_Boolean); | |
2663 | end Legal_Formal_Attribute; | |
2664 | ||
85d6bf87 AC |
2665 | --------------------------------------------------------------- |
2666 | -- Max_Alignment_For_Allocation_Max_Size_In_Storage_Elements -- | |
2667 | --------------------------------------------------------------- | |
2668 | ||
2669 | procedure Max_Alignment_For_Allocation_Max_Size_In_Storage_Elements is | |
2670 | begin | |
2671 | Check_E0; | |
2672 | Check_Type; | |
2673 | Check_Not_Incomplete_Type; | |
2674 | Set_Etype (N, Universal_Integer); | |
2675 | end Max_Alignment_For_Allocation_Max_Size_In_Storage_Elements; | |
2676 | ||
2677 | ------------- | |
2678 | -- Min_Max -- | |
2679 | ------------- | |
2680 | ||
2681 | procedure Min_Max is | |
2682 | begin | |
2683 | Check_E2; | |
2684 | Check_Scalar_Type; | |
2685 | Resolve (E1, P_Base_Type); | |
2686 | Resolve (E2, P_Base_Type); | |
2687 | Set_Etype (N, P_Base_Type); | |
2688 | ||
2689 | -- Check for comparison on unordered enumeration type | |
2690 | ||
2691 | if Bad_Unordered_Enumeration_Reference (N, P_Base_Type) then | |
2692 | Error_Msg_Sloc := Sloc (P_Base_Type); | |
2693 | Error_Msg_NE | |
2694 | ("comparison on unordered enumeration type& declared#?U?", | |
2695 | N, P_Base_Type); | |
2696 | end if; | |
2697 | end Min_Max; | |
2698 | ||
996ae0b0 RK |
2699 | ------------------------ |
2700 | -- Standard_Attribute -- | |
2701 | ------------------------ | |
2702 | ||
2703 | procedure Standard_Attribute (Val : Int) is | |
2704 | begin | |
2705 | Check_Standard_Prefix; | |
fbf5a39b | 2706 | Rewrite (N, Make_Integer_Literal (Loc, Val)); |
996ae0b0 | 2707 | Analyze (N); |
edab6088 | 2708 | Set_Is_Static_Expression (N, True); |
996ae0b0 RK |
2709 | end Standard_Attribute; |
2710 | ||
96e90ac1 RD |
2711 | -------------------- |
2712 | -- Uneval_Old_Msg -- | |
2713 | -------------------- | |
2714 | ||
2715 | procedure Uneval_Old_Msg is | |
effdbb7d | 2716 | Uneval_Old_Setting : Character; |
1773d80b AC |
2717 | Prag : Node_Id; |
2718 | ||
96e90ac1 | 2719 | begin |
1773d80b AC |
2720 | -- If from aspect, then Uneval_Old_Setting comes from flags in the |
2721 | -- N_Aspect_Specification node that corresponds to the attribute. | |
2722 | ||
2723 | -- First find the pragma in which we appear (note that at this stage, | |
2724 | -- even if we appeared originally within an aspect specification, we | |
2725 | -- are now within the corresponding pragma). | |
2726 | ||
2727 | Prag := N; | |
2728 | loop | |
2729 | Prag := Parent (Prag); | |
2730 | exit when No (Prag) or else Nkind (Prag) = N_Pragma; | |
2731 | end loop; | |
2732 | ||
effdbb7d AC |
2733 | if Present (Prag) then |
2734 | if Uneval_Old_Accept (Prag) then | |
1773d80b | 2735 | Uneval_Old_Setting := 'A'; |
effdbb7d | 2736 | elsif Uneval_Old_Warn (Prag) then |
1773d80b AC |
2737 | Uneval_Old_Setting := 'W'; |
2738 | else | |
2739 | Uneval_Old_Setting := 'E'; | |
2740 | end if; | |
effdbb7d AC |
2741 | |
2742 | -- If we did not find the pragma, that's odd, just use the setting | |
2743 | -- from Opt.Uneval_Old. Perhaps this is due to a previous error? | |
2744 | ||
2745 | else | |
2746 | Uneval_Old_Setting := Opt.Uneval_Old; | |
1773d80b AC |
2747 | end if; |
2748 | ||
2749 | -- Processing depends on the setting of Uneval_Old | |
2750 | ||
2751 | case Uneval_Old_Setting is | |
96e90ac1 RD |
2752 | when 'E' => |
2753 | Error_Attr_P | |
2754 | ("prefix of attribute % that is potentially " | |
2755 | & "unevaluated must denote an entity"); | |
2756 | ||
2757 | when 'W' => | |
b8b2d982 AC |
2758 | Error_Msg_Name_1 := Aname; |
2759 | Error_Msg_F | |
96e90ac1 | 2760 | ("??prefix of attribute % appears in potentially " |
b8b2d982 | 2761 | & "unevaluated context, exception may be raised", P); |
96e90ac1 RD |
2762 | |
2763 | when 'A' => | |
2764 | null; | |
2765 | ||
2766 | when others => | |
2767 | raise Program_Error; | |
2768 | end case; | |
2769 | end Uneval_Old_Msg; | |
2770 | ||
996ae0b0 RK |
2771 | ------------------------- |
2772 | -- Unexpected Argument -- | |
2773 | ------------------------- | |
2774 | ||
2775 | procedure Unexpected_Argument (En : Node_Id) is | |
2776 | begin | |
2777 | Error_Attr ("unexpected argument for % attribute", En); | |
2778 | end Unexpected_Argument; | |
2779 | ||
2780 | ------------------------------------------------- | |
2781 | -- Validate_Non_Static_Attribute_Function_Call -- | |
2782 | ------------------------------------------------- | |
2783 | ||
2784 | -- This function should be moved to Sem_Dist ??? | |
2785 | ||
2786 | procedure Validate_Non_Static_Attribute_Function_Call is | |
2787 | begin | |
2788 | if In_Preelaborated_Unit | |
2789 | and then not In_Subprogram_Or_Concurrent_Unit | |
2790 | then | |
fbf5a39b AC |
2791 | Flag_Non_Static_Expr |
2792 | ("non-static function call in preelaborated unit!", N); | |
996ae0b0 RK |
2793 | end if; |
2794 | end Validate_Non_Static_Attribute_Function_Call; | |
2795 | ||
cb3d8731 | 2796 | -- Start of processing for Analyze_Attribute |
996ae0b0 RK |
2797 | |
2798 | begin | |
58ba2415 HK |
2799 | -- Immediate return if unrecognized attribute (already diagnosed by |
2800 | -- parser, so there is nothing more that we need to do). | |
996ae0b0 RK |
2801 | |
2802 | if not Is_Attribute_Name (Aname) then | |
2803 | raise Bad_Attribute; | |
2804 | end if; | |
2805 | ||
58ba2415 HK |
2806 | Check_Restriction_No_Use_Of_Attribute (N); |
2807 | ||
822033eb | 2808 | -- Deal with Ada 83 issues |
996ae0b0 | 2809 | |
fbf5a39b AC |
2810 | if Comes_From_Source (N) then |
2811 | if not Attribute_83 (Attr_Id) then | |
0ab80019 | 2812 | if Ada_Version = Ada_83 and then Comes_From_Source (N) then |
fbf5a39b | 2813 | Error_Msg_Name_1 := Aname; |
324ac540 | 2814 | Error_Msg_N ("(Ada 83) attribute% is not standard??", N); |
fbf5a39b | 2815 | end if; |
996ae0b0 | 2816 | |
fbf5a39b AC |
2817 | if Attribute_Impl_Def (Attr_Id) then |
2818 | Check_Restriction (No_Implementation_Attributes, N); | |
2819 | end if; | |
996ae0b0 RK |
2820 | end if; |
2821 | end if; | |
2822 | ||
edab6088 | 2823 | -- Deal with Ada 2005 attributes that are implementation attributes |
155562cb AC |
2824 | -- because they appear in a version of Ada before Ada 2005, and |
2825 | -- similarly for Ada 2012 attributes appearing in an earlier version. | |
822033eb | 2826 | |
155562cb AC |
2827 | if (Attribute_05 (Attr_Id) and then Ada_Version < Ada_2005) |
2828 | or else | |
2829 | (Attribute_12 (Attr_Id) and then Ada_Version < Ada_2012) | |
2830 | then | |
822033eb HK |
2831 | Check_Restriction (No_Implementation_Attributes, N); |
2832 | end if; | |
2833 | ||
996ae0b0 RK |
2834 | -- Remote access to subprogram type access attribute reference needs |
2835 | -- unanalyzed copy for tree transformation. The analyzed copy is used | |
2836 | -- for its semantic information (whether prefix is a remote subprogram | |
2837 | -- name), the unanalyzed copy is used to construct new subtree rooted | |
f529bac5 | 2838 | -- with N_Aggregate which represents a fat pointer aggregate. |
996ae0b0 RK |
2839 | |
2840 | if Aname = Name_Access then | |
fbf5a39b | 2841 | Discard_Node (Copy_Separate_Tree (N)); |
996ae0b0 RK |
2842 | end if; |
2843 | ||
2844 | -- Analyze prefix and exit if error in analysis. If the prefix is an | |
442ade9d RD |
2845 | -- incomplete type, use full view if available. Note that there are |
2846 | -- some attributes for which we do not analyze the prefix, since the | |
d2b4b3da | 2847 | -- prefix is not a normal name, or else needs special handling. |
996ae0b0 | 2848 | |
2cbac6c6 AC |
2849 | if Aname /= Name_Elab_Body and then |
2850 | Aname /= Name_Elab_Spec and then | |
2851 | Aname /= Name_Elab_Subp_Body and then | |
2cbac6c6 | 2852 | Aname /= Name_Enabled and then |
d2b4b3da | 2853 | Aname /= Name_Old |
996ae0b0 RK |
2854 | then |
2855 | Analyze (P); | |
2856 | P_Type := Etype (P); | |
2857 | ||
2858 | if Is_Entity_Name (P) | |
2859 | and then Present (Entity (P)) | |
2860 | and then Is_Type (Entity (P)) | |
996ae0b0 | 2861 | then |
b8dc622e JM |
2862 | if Ekind (Entity (P)) = E_Incomplete_Type then |
2863 | P_Type := Get_Full_View (P_Type); | |
2864 | Set_Entity (P, P_Type); | |
2865 | Set_Etype (P, P_Type); | |
2866 | ||
2867 | elsif Entity (P) = Current_Scope | |
2868 | and then Is_Record_Type (Entity (P)) | |
2869 | then | |
b8dc622e JM |
2870 | -- Use of current instance within the type. Verify that if the |
2871 | -- attribute appears within a constraint, it yields an access | |
2872 | -- type, other uses are illegal. | |
2873 | ||
2874 | declare | |
2875 | Par : Node_Id; | |
2876 | ||
2877 | begin | |
2878 | Par := Parent (N); | |
2879 | while Present (Par) | |
2880 | and then Nkind (Parent (Par)) /= N_Component_Definition | |
2881 | loop | |
2882 | Par := Parent (Par); | |
2883 | end loop; | |
2884 | ||
2885 | if Present (Par) | |
2886 | and then Nkind (Par) = N_Subtype_Indication | |
2887 | then | |
2888 | if Attr_Id /= Attribute_Access | |
2889 | and then Attr_Id /= Attribute_Unchecked_Access | |
2890 | and then Attr_Id /= Attribute_Unrestricted_Access | |
2891 | then | |
2892 | Error_Msg_N | |
21db8699 RD |
2893 | ("in a constraint the current instance can only " |
2894 | & "be used with an access attribute", N); | |
b8dc622e JM |
2895 | end if; |
2896 | end if; | |
2897 | end; | |
2898 | end if; | |
996ae0b0 RK |
2899 | end if; |
2900 | ||
2901 | if P_Type = Any_Type then | |
2902 | raise Bad_Attribute; | |
2903 | end if; | |
2904 | ||
2905 | P_Base_Type := Base_Type (P_Type); | |
996ae0b0 RK |
2906 | end if; |
2907 | ||
2908 | -- Analyze expressions that may be present, exiting if an error occurs | |
2909 | ||
2910 | if No (Exprs) then | |
2911 | E1 := Empty; | |
2912 | E2 := Empty; | |
2913 | ||
2914 | else | |
2915 | E1 := First (Exprs); | |
996ae0b0 | 2916 | |
2cbac6c6 AC |
2917 | -- Skip analysis for case of Restriction_Set, we do not expect |
2918 | -- the argument to be analyzed in this case. | |
457b6274 | 2919 | |
2cbac6c6 AC |
2920 | if Aname /= Name_Restriction_Set then |
2921 | Analyze (E1); | |
2922 | ||
2923 | -- Check for missing/bad expression (result of previous error) | |
2924 | ||
2925 | if No (E1) or else Etype (E1) = Any_Type then | |
2926 | raise Bad_Attribute; | |
2927 | end if; | |
996ae0b0 RK |
2928 | end if; |
2929 | ||
2930 | E2 := Next (E1); | |
2931 | ||
2932 | if Present (E2) then | |
2933 | Analyze (E2); | |
2934 | ||
2935 | if Etype (E2) = Any_Type then | |
2936 | raise Bad_Attribute; | |
2937 | end if; | |
2938 | ||
2939 | if Present (Next (E2)) then | |
2940 | Unexpected_Argument (Next (E2)); | |
2941 | end if; | |
2942 | end if; | |
2943 | end if; | |
2944 | ||
0083dd66 AC |
2945 | -- Cases where prefix must be resolvable by itself |
2946 | ||
446ebdbb | 2947 | if Is_Overloaded (P) |
edd63e9b ES |
2948 | and then Aname /= Name_Access |
2949 | and then Aname /= Name_Address | |
2950 | and then Aname /= Name_Code_Address | |
21d27997 | 2951 | and then Aname /= Name_Result |
edd63e9b ES |
2952 | and then Aname /= Name_Unchecked_Access |
2953 | then | |
890f1954 | 2954 | -- The prefix must be resolvable by itself, without reference to the |
446ebdbb AC |
2955 | -- attribute. One case that requires special handling is a prefix |
2956 | -- that is a function name, where one interpretation may be a | |
2957 | -- parameterless call. Entry attributes are handled specially below. | |
edd63e9b | 2958 | |
446ebdbb | 2959 | if Is_Entity_Name (P) |
ba0c6e47 | 2960 | and then not Nam_In (Aname, Name_Count, Name_Caller) |
edd63e9b | 2961 | then |
446ebdbb AC |
2962 | Check_Parameterless_Call (P); |
2963 | end if; | |
edd63e9b | 2964 | |
890f1954 | 2965 | if Is_Overloaded (P) then |
edd63e9b | 2966 | |
890f1954 | 2967 | -- Ada 2005 (AI-345): Since protected and task types have |
ba0c6e47 RD |
2968 | -- primitive entry wrappers, the attributes Count, and Caller |
2969 | -- require a context check | |
edd63e9b | 2970 | |
ba0c6e47 | 2971 | if Nam_In (Aname, Name_Count, Name_Caller) then |
890f1954 RD |
2972 | declare |
2973 | Count : Natural := 0; | |
2974 | I : Interp_Index; | |
2975 | It : Interp; | |
446ebdbb | 2976 | |
890f1954 RD |
2977 | begin |
2978 | Get_First_Interp (P, I, It); | |
2979 | while Present (It.Nam) loop | |
2980 | if Comes_From_Source (It.Nam) then | |
2981 | Count := Count + 1; | |
446ebdbb | 2982 | else |
890f1954 | 2983 | Remove_Interp (I); |
446ebdbb | 2984 | end if; |
edd63e9b | 2985 | |
890f1954 RD |
2986 | Get_Next_Interp (I, It); |
2987 | end loop; | |
2988 | ||
2989 | if Count > 1 then | |
2990 | Error_Attr ("ambiguous prefix for % attribute", P); | |
2991 | else | |
2992 | Set_Is_Overloaded (P, False); | |
2993 | end if; | |
2994 | end; | |
2995 | ||
2996 | else | |
2997 | Error_Attr ("ambiguous prefix for % attribute", P); | |
2998 | end if; | |
edd63e9b | 2999 | end if; |
996ae0b0 RK |
3000 | end if; |
3001 | ||
2ba431e5 YM |
3002 | -- In SPARK, attributes of private types are only allowed if the full |
3003 | -- type declaration is visible. | |
8ed68165 | 3004 | |
446ebdbb AC |
3005 | -- Note: the check for Present (Entity (P)) defends against some error |
3006 | -- conditions where the Entity field is not set. | |
3007 | ||
3008 | if Is_Entity_Name (P) and then Present (Entity (P)) | |
8ed68165 AC |
3009 | and then Is_Type (Entity (P)) |
3010 | and then Is_Private_Type (P_Type) | |
3011 | and then not In_Open_Scopes (Scope (P_Type)) | |
3012 | and then not In_Spec_Expression | |
3013 | then | |
ce5ba43a | 3014 | Check_SPARK_05_Restriction ("invisible attribute of type", N); |
8ed68165 AC |
3015 | end if; |
3016 | ||
996ae0b0 RK |
3017 | -- Remaining processing depends on attribute |
3018 | ||
3019 | case Attr_Id is | |
3020 | ||
de94a7e7 AC |
3021 | -- Attributes related to Ada 2012 iterators. Attribute specifications |
3022 | -- exist for these, but they cannot be queried. | |
3023 | ||
d8f43ee6 HK |
3024 | when Attribute_Constant_Indexing |
3025 | | Attribute_Default_Iterator | |
3026 | | Attribute_Implicit_Dereference | |
3027 | | Attribute_Iterator_Element | |
3028 | | Attribute_Iterable | |
3029 | | Attribute_Variable_Indexing | |
3030 | => | |
de94a7e7 | 3031 | Error_Msg_N ("illegal attribute", N); |
0da80d7d | 3032 | |
d27f3ff4 AC |
3033 | -- Internal attributes used to deal with Ada 2012 delayed aspects. These |
3034 | -- were already rejected by the parser. Thus they shouldn't appear here. | |
b98e2969 | 3035 | |
c1107fa3 | 3036 | when Internal_Attribute_Id => |
d48f3dca | 3037 | raise Program_Error; |
b98e2969 | 3038 | |
996ae0b0 RK |
3039 | ------------------ |
3040 | -- Abort_Signal -- | |
3041 | ------------------ | |
3042 | ||
3043 | when Attribute_Abort_Signal => | |
3044 | Check_Standard_Prefix; | |
e4494292 | 3045 | Rewrite (N, New_Occurrence_Of (Stand.Abort_Signal, Loc)); |
996ae0b0 RK |
3046 | Analyze (N); |
3047 | ||
3048 | ------------ | |
3049 | -- Access -- | |
3050 | ------------ | |
3051 | ||
3052 | when Attribute_Access => | |
fbf5a39b | 3053 | Analyze_Access_Attribute; |
22efcab7 | 3054 | Check_Not_Incomplete_Type; |
996ae0b0 RK |
3055 | |
3056 | ------------- | |
3057 | -- Address -- | |
3058 | ------------- | |
3059 | ||
3060 | when Attribute_Address => | |
3061 | Check_E0; | |
3cd4a210 | 3062 | Address_Checks; |
22efcab7 | 3063 | Check_Not_Incomplete_Type; |
996ae0b0 RK |
3064 | Set_Etype (N, RTE (RE_Address)); |
3065 | ||
3066 | ------------------ | |
3067 | -- Address_Size -- | |
3068 | ------------------ | |
3069 | ||
3070 | when Attribute_Address_Size => | |
3071 | Standard_Attribute (System_Address_Size); | |
3072 | ||
3073 | -------------- | |
3074 | -- Adjacent -- | |
3075 | -------------- | |
3076 | ||
3077 | when Attribute_Adjacent => | |
3078 | Check_Floating_Point_Type_2; | |
3079 | Set_Etype (N, P_Base_Type); | |
3080 | Resolve (E1, P_Base_Type); | |
3081 | Resolve (E2, P_Base_Type); | |
3082 | ||
3083 | --------- | |
3084 | -- Aft -- | |
3085 | --------- | |
3086 | ||
3087 | when Attribute_Aft => | |
3088 | Check_Fixed_Point_Type_0; | |
3089 | Set_Etype (N, Universal_Integer); | |
3090 | ||
3091 | --------------- | |
3092 | -- Alignment -- | |
3093 | --------------- | |
3094 | ||
3095 | when Attribute_Alignment => | |
3096 | ||
3097 | -- Don't we need more checking here, cf Size ??? | |
3098 | ||
3099 | Check_E0; | |
3100 | Check_Not_Incomplete_Type; | |
21d27997 | 3101 | Check_Not_CPP_Type; |
996ae0b0 RK |
3102 | Set_Etype (N, Universal_Integer); |
3103 | ||
3104 | --------------- | |
3105 | -- Asm_Input -- | |
3106 | --------------- | |
3107 | ||
3108 | when Attribute_Asm_Input => | |
3109 | Check_Asm_Attribute; | |
7e4680c1 | 3110 | |
c9d2e84b | 3111 | -- The back end may need to take the address of E2 |
7e4680c1 EB |
3112 | |
3113 | if Is_Entity_Name (E2) then | |
3114 | Set_Address_Taken (Entity (E2)); | |
3115 | end if; | |
3116 | ||
996ae0b0 RK |
3117 | Set_Etype (N, RTE (RE_Asm_Input_Operand)); |
3118 | ||
3119 | ---------------- | |
3120 | -- Asm_Output -- | |
3121 | ---------------- | |
3122 | ||
3123 | when Attribute_Asm_Output => | |
3124 | Check_Asm_Attribute; | |
3125 | ||
3126 | if Etype (E2) = Any_Type then | |
3127 | return; | |
3128 | ||
3129 | elsif Aname = Name_Asm_Output then | |
3130 | if not Is_Variable (E2) then | |
3131 | Error_Attr | |
3132 | ("second argument for Asm_Output is not variable", E2); | |
3133 | end if; | |
3134 | end if; | |
3135 | ||
21d27997 | 3136 | Note_Possible_Modification (E2, Sure => True); |
7e4680c1 | 3137 | |
c9d2e84b | 3138 | -- The back end may need to take the address of E2 |
7e4680c1 EB |
3139 | |
3140 | if Is_Entity_Name (E2) then | |
3141 | Set_Address_Taken (Entity (E2)); | |
3142 | end if; | |
3143 | ||
996ae0b0 RK |
3144 | Set_Etype (N, RTE (RE_Asm_Output_Operand)); |
3145 | ||
0ebc109a VP |
3146 | ----------------------------- |
3147 | -- Atomic_Always_Lock_Free -- | |
3148 | ----------------------------- | |
3149 | ||
3150 | when Attribute_Atomic_Always_Lock_Free => | |
3151 | Check_E0; | |
3152 | Check_Type; | |
3153 | Set_Etype (N, Standard_Boolean); | |
3154 | ||
996ae0b0 RK |
3155 | ---------- |
3156 | -- Base -- | |
3157 | ---------- | |
3158 | ||
fbf5a39b AC |
3159 | -- Note: when the base attribute appears in the context of a subtype |
3160 | -- mark, the analysis is done by Sem_Ch8.Find_Type, rather than by | |
3161 | -- the following circuit. | |
3162 | ||
996ae0b0 RK |
3163 | when Attribute_Base => Base : declare |
3164 | Typ : Entity_Id; | |
3165 | ||
3166 | begin | |
9c5a3a8d | 3167 | Check_E0; |
996ae0b0 RK |
3168 | Find_Type (P); |
3169 | Typ := Entity (P); | |
3170 | ||
0ab80019 | 3171 | if Ada_Version >= Ada_95 |
fbf5a39b AC |
3172 | and then not Is_Scalar_Type (Typ) |
3173 | and then not Is_Generic_Type (Typ) | |
3174 | then | |
822033eb | 3175 | Error_Attr_P ("prefix of Base attribute must be scalar type"); |
fbf5a39b AC |
3176 | |
3177 | elsif Sloc (Typ) = Standard_Location | |
996ae0b0 RK |
3178 | and then Base_Type (Typ) = Typ |
3179 | and then Warn_On_Redundant_Constructs | |
3180 | then | |
ed2233dc | 3181 | Error_Msg_NE -- CODEFIX |
324ac540 | 3182 | ("?r?redundant attribute, & is its own base type", N, Typ); |
996ae0b0 RK |
3183 | end if; |
3184 | ||
7a489a2b AC |
3185 | if Nkind (Parent (N)) /= N_Attribute_Reference then |
3186 | Error_Msg_Name_1 := Aname; | |
ce5ba43a | 3187 | Check_SPARK_05_Restriction |
7a489a2b AC |
3188 | ("attribute% is only allowed as prefix of another attribute", P); |
3189 | end if; | |
3190 | ||
996ae0b0 | 3191 | Set_Etype (N, Base_Type (Entity (P))); |
9c5a3a8d | 3192 | Set_Entity (N, Base_Type (Entity (P))); |
e4494292 | 3193 | Rewrite (N, New_Occurrence_Of (Entity (N), Loc)); |
9c5a3a8d | 3194 | Analyze (N); |
996ae0b0 RK |
3195 | end Base; |
3196 | ||
3197 | --------- | |
3198 | -- Bit -- | |
3199 | --------- | |
3200 | ||
d8f43ee6 | 3201 | when Attribute_Bit => |
996ae0b0 RK |
3202 | Check_E0; |
3203 | ||
3204 | if not Is_Object_Reference (P) then | |
822033eb | 3205 | Error_Attr_P ("prefix for % attribute must be object"); |
996ae0b0 RK |
3206 | |
3207 | -- What about the access object cases ??? | |
3208 | ||
3209 | else | |
3210 | null; | |
3211 | end if; | |
3212 | ||
3213 | Set_Etype (N, Universal_Integer); | |
996ae0b0 RK |
3214 | |
3215 | --------------- | |
3216 | -- Bit_Order -- | |
3217 | --------------- | |
3218 | ||
d8f43ee6 | 3219 | when Attribute_Bit_Order => |
996ae0b0 RK |
3220 | Check_E0; |
3221 | Check_Type; | |
3222 | ||
3223 | if not Is_Record_Type (P_Type) then | |
822033eb | 3224 | Error_Attr_P ("prefix of % attribute must be record type"); |
996ae0b0 RK |
3225 | end if; |
3226 | ||
3227 | if Bytes_Big_Endian xor Reverse_Bit_Order (P_Type) then | |
3228 | Rewrite (N, | |
3229 | New_Occurrence_Of (RTE (RE_High_Order_First), Loc)); | |
3230 | else | |
3231 | Rewrite (N, | |
3232 | New_Occurrence_Of (RTE (RE_Low_Order_First), Loc)); | |
3233 | end if; | |
3234 | ||
3235 | Set_Etype (N, RTE (RE_Bit_Order)); | |
fbf5a39b | 3236 | Resolve (N); |
996ae0b0 RK |
3237 | |
3238 | -- Reset incorrect indication of staticness | |
3239 | ||
3240 | Set_Is_Static_Expression (N, False); | |
996ae0b0 RK |
3241 | |
3242 | ------------------ | |
3243 | -- Bit_Position -- | |
3244 | ------------------ | |
3245 | ||
3246 | -- Note: in generated code, we can have a Bit_Position attribute | |
3247 | -- applied to a (naked) record component (i.e. the prefix is an | |
3248 | -- identifier that references an E_Component or E_Discriminant | |
3249 | -- entity directly, and this is interpreted as expected by Gigi. | |
3250 | -- The following code will not tolerate such usage, but when the | |
3251 | -- expander creates this special case, it marks it as analyzed | |
3252 | -- immediately and sets an appropriate type. | |
3253 | ||
3254 | when Attribute_Bit_Position => | |
996ae0b0 RK |
3255 | if Comes_From_Source (N) then |
3256 | Check_Component; | |
3257 | end if; | |
3258 | ||
3259 | Set_Etype (N, Universal_Integer); | |
3260 | ||
3261 | ------------------ | |
3262 | -- Body_Version -- | |
3263 | ------------------ | |
3264 | ||
3265 | when Attribute_Body_Version => | |
3266 | Check_E0; | |
3267 | Check_Program_Unit; | |
3268 | Set_Etype (N, RTE (RE_Version_String)); | |
3269 | ||
3270 | -------------- | |
3271 | -- Callable -- | |
3272 | -------------- | |
3273 | ||
3274 | when Attribute_Callable => | |
3275 | Check_E0; | |
3276 | Set_Etype (N, Standard_Boolean); | |
3277 | Check_Task_Prefix; | |
3278 | ||
3279 | ------------ | |
3280 | -- Caller -- | |
3281 | ------------ | |
3282 | ||
3283 | when Attribute_Caller => Caller : declare | |
3284 | Ent : Entity_Id; | |
3285 | S : Entity_Id; | |
3286 | ||
3287 | begin | |
3288 | Check_E0; | |
3289 | ||
e10dab7f | 3290 | if Nkind_In (P, N_Identifier, N_Expanded_Name) then |
996ae0b0 RK |
3291 | Ent := Entity (P); |
3292 | ||
3293 | if not Is_Entry (Ent) then | |
3294 | Error_Attr ("invalid entry name", N); | |
3295 | end if; | |
3296 | ||
3297 | else | |
3298 | Error_Attr ("invalid entry name", N); | |
3299 | return; | |
3300 | end if; | |
3301 | ||
3302 | for J in reverse 0 .. Scope_Stack.Last loop | |
3303 | S := Scope_Stack.Table (J).Entity; | |
3304 | ||
3305 | if S = Scope (Ent) then | |
3306 | Error_Attr ("Caller must appear in matching accept or body", N); | |
3307 | elsif S = Ent then | |
3308 | exit; | |
3309 | end if; | |
3310 | end loop; | |
3311 | ||
b5e792e2 | 3312 | Set_Etype (N, RTE (RO_AT_Task_Id)); |
996ae0b0 RK |
3313 | end Caller; |
3314 | ||
3315 | ------------- | |
3316 | -- Ceiling -- | |
3317 | ------------- | |
3318 | ||
3319 | when Attribute_Ceiling => | |
3320 | Check_Floating_Point_Type_1; | |
3321 | Set_Etype (N, P_Base_Type); | |
3322 | Resolve (E1, P_Base_Type); | |
3323 | ||
3324 | ----------- | |
3325 | -- Class -- | |
3326 | ----------- | |
3327 | ||
9c5a3a8d | 3328 | when Attribute_Class => |
996ae0b0 | 3329 | Check_Restriction (No_Dispatch, N); |
9c5a3a8d ST |
3330 | Check_E0; |
3331 | Find_Type (N); | |
996ae0b0 | 3332 | |
b5c739f9 RD |
3333 | -- Applying Class to untagged incomplete type is obsolescent in Ada |
3334 | -- 2005. Note that we can't test Is_Tagged_Type here on P_Type, since | |
3335 | -- this flag gets set by Find_Type in this situation. | |
3336 | ||
7a963087 | 3337 | if Restriction_Check_Required (No_Obsolescent_Features) |
b5c739f9 RD |
3338 | and then Ada_Version >= Ada_2005 |
3339 | and then Ekind (P_Type) = E_Incomplete_Type | |
3340 | then | |
3341 | declare | |
3342 | DN : constant Node_Id := Declaration_Node (P_Type); | |
3343 | begin | |
3344 | if Nkind (DN) = N_Incomplete_Type_Declaration | |
3345 | and then not Tagged_Present (DN) | |
3346 | then | |
3347 | Check_Restriction (No_Obsolescent_Features, P); | |
3348 | end if; | |
3349 | end; | |
3350 | end if; | |
3351 | ||
996ae0b0 RK |
3352 | ------------------ |
3353 | -- Code_Address -- | |
3354 | ------------------ | |
3355 | ||
3356 | when Attribute_Code_Address => | |
3357 | Check_E0; | |
3358 | ||
3359 | if Nkind (P) = N_Attribute_Reference | |
b69cd36a | 3360 | and then Nam_In (Attribute_Name (P), Name_Elab_Body, Name_Elab_Spec) |
996ae0b0 RK |
3361 | then |
3362 | null; | |
3363 | ||
3364 | elsif not Is_Entity_Name (P) | |
3365 | or else (Ekind (Entity (P)) /= E_Function | |
3366 | and then | |
3367 | Ekind (Entity (P)) /= E_Procedure) | |
3368 | then | |
3369 | Error_Attr ("invalid prefix for % attribute", P); | |
3370 | Set_Address_Taken (Entity (P)); | |
16212e89 GD |
3371 | |
3372 | -- Issue an error if the prefix denotes an eliminated subprogram | |
3373 | ||
3374 | else | |
3375 | Check_For_Eliminated_Subprogram (P, Entity (P)); | |
996ae0b0 RK |
3376 | end if; |
3377 | ||
3378 | Set_Etype (N, RTE (RE_Address)); | |
3379 | ||
e0bf7d65 RD |
3380 | ---------------------- |
3381 | -- Compiler_Version -- | |
3382 | ---------------------- | |
3383 | ||
3384 | when Attribute_Compiler_Version => | |
3385 | Check_E0; | |
3386 | Check_Standard_Prefix; | |
1f110335 | 3387 | Rewrite (N, Make_String_Literal (Loc, "GNAT " & Gnat_Version_String)); |
e0bf7d65 | 3388 | Analyze_And_Resolve (N, Standard_String); |
edab6088 | 3389 | Set_Is_Static_Expression (N, True); |
e0bf7d65 | 3390 | |
996ae0b0 RK |
3391 | -------------------- |
3392 | -- Component_Size -- | |
3393 | -------------------- | |
3394 | ||
3395 | when Attribute_Component_Size => | |
3396 | Check_E0; | |
3397 | Set_Etype (N, Universal_Integer); | |
3398 | ||
3399 | -- Note: unlike other array attributes, unconstrained arrays are OK | |
3400 | ||
3401 | if Is_Array_Type (P_Type) and then not Is_Constrained (P_Type) then | |
3402 | null; | |
3403 | else | |
3404 | Check_Array_Type; | |
3405 | end if; | |
3406 | ||
3407 | ------------- | |
3408 | -- Compose -- | |
3409 | ------------- | |
3410 | ||
3411 | when Attribute_Compose => | |
3412 | Check_Floating_Point_Type_2; | |
3413 | Set_Etype (N, P_Base_Type); | |
3414 | Resolve (E1, P_Base_Type); | |
3415 | Resolve (E2, Any_Integer); | |
3416 | ||
3417 | ----------------- | |
3418 | -- Constrained -- | |
3419 | ----------------- | |
3420 | ||
3421 | when Attribute_Constrained => | |
3422 | Check_E0; | |
3423 | Set_Etype (N, Standard_Boolean); | |
3424 | ||
3425 | -- Case from RM J.4(2) of constrained applied to private type | |
3426 | ||
3427 | if Is_Entity_Name (P) and then Is_Type (Entity (P)) then | |
b5c739f9 | 3428 | Check_Restriction (No_Obsolescent_Features, P); |
5f3ab6fb AC |
3429 | |
3430 | if Warn_On_Obsolescent_Feature then | |
3431 | Error_Msg_N | |
d8f43ee6 HK |
3432 | ("constrained for private type is an obsolescent feature " |
3433 | & "(RM J.4)?j?", N); | |
5f3ab6fb | 3434 | end if; |
996ae0b0 RK |
3435 | |
3436 | -- If we are within an instance, the attribute must be legal | |
19f0526a AC |
3437 | -- because it was valid in the generic unit. Ditto if this is |
3438 | -- an inlining of a function declared in an instance. | |
996ae0b0 | 3439 | |
b80a2b4b | 3440 | if In_Instance or else In_Inlined_Body then |
996ae0b0 RK |
3441 | return; |
3442 | ||
3443 | -- For sure OK if we have a real private type itself, but must | |
3444 | -- be completed, cannot apply Constrained to incomplete type. | |
3445 | ||
3446 | elsif Is_Private_Type (Entity (P)) then | |
fbf5a39b AC |
3447 | |
3448 | -- Note: this is one of the Annex J features that does not | |
3449 | -- generate a warning from -gnatwj, since in fact it seems | |
3450 | -- very useful, and is used in the GNAT runtime. | |
3451 | ||
996ae0b0 RK |
3452 | Check_Not_Incomplete_Type; |
3453 | return; | |
3454 | end if; | |
3455 | ||
fbf5a39b AC |
3456 | -- Normal (non-obsolescent case) of application to object of |
3457 | -- a discriminated type. | |
3458 | ||
996ae0b0 RK |
3459 | else |
3460 | Check_Object_Reference (P); | |
3461 | ||
3462 | -- If N does not come from source, then we allow the | |
3463 | -- the attribute prefix to be of a private type whose | |
3464 | -- full type has discriminants. This occurs in cases | |
3465 | -- involving expanded calls to stream attributes. | |
3466 | ||
3467 | if not Comes_From_Source (N) then | |
3468 | P_Type := Underlying_Type (P_Type); | |
3469 | end if; | |
3470 | ||
8c519039 AC |
3471 | -- Must have discriminants or be an access type designating a type |
3472 | -- with discriminants. If it is a class-wide type it has unknown | |
3473 | -- discriminants. | |
996ae0b0 RK |
3474 | |
3475 | if Has_Discriminants (P_Type) | |
a6152428 AC |
3476 | or else Has_Unknown_Discriminants (P_Type) |
3477 | or else | |
3478 | (Is_Access_Type (P_Type) | |
3479 | and then Has_Discriminants (Designated_Type (P_Type))) | |
996ae0b0 RK |
3480 | then |
3481 | return; | |
3482 | ||
a6152428 AC |
3483 | -- The rule given in 3.7.2 is part of static semantics, but the |
3484 | -- intent is clearly that it be treated as a legality rule, and | |
3485 | -- rechecked in the visible part of an instance. Nevertheless | |
3486 | -- the intent also seems to be it should legally apply to the | |
3487 | -- actual of a formal with unknown discriminants, regardless of | |
3488 | -- whether the actual has discriminants, in which case the value | |
3489 | -- of the attribute is determined using the J.4 rules. This choice | |
3490 | -- seems the most useful, and is compatible with existing tests. | |
3491 | ||
3492 | elsif In_Instance then | |
3493 | return; | |
3494 | ||
996ae0b0 | 3495 | -- Also allow an object of a generic type if extensions allowed |
a6152428 | 3496 | -- and allow this for any type at all. (this may be obsolete ???) |
996ae0b0 RK |
3497 | |
3498 | elsif (Is_Generic_Type (P_Type) | |
a6152428 | 3499 | or else Is_Generic_Actual_Type (P_Type)) |
996ae0b0 RK |
3500 | and then Extensions_Allowed |
3501 | then | |
3502 | return; | |
3503 | end if; | |
3504 | end if; | |
3505 | ||
3506 | -- Fall through if bad prefix | |
3507 | ||
822033eb HK |
3508 | Error_Attr_P |
3509 | ("prefix of % attribute must be object of discriminated type"); | |
996ae0b0 RK |
3510 | |
3511 | --------------- | |
3512 | -- Copy_Sign -- | |
3513 | --------------- | |
3514 | ||
3515 | when Attribute_Copy_Sign => | |
3516 | Check_Floating_Point_Type_2; | |
3517 | Set_Etype (N, P_Base_Type); | |
3518 | Resolve (E1, P_Base_Type); | |
3519 | Resolve (E2, P_Base_Type); | |
3520 | ||
3521 | ----------- | |
3522 | -- Count -- | |
3523 | ----------- | |
3524 | ||
d8f43ee6 | 3525 | when Attribute_Count => Count : declare |
996ae0b0 RK |
3526 | Ent : Entity_Id; |
3527 | S : Entity_Id; | |
3528 | Tsk : Entity_Id; | |
3529 | ||
3530 | begin | |
3531 | Check_E0; | |
3532 | ||
e10dab7f | 3533 | if Nkind_In (P, N_Identifier, N_Expanded_Name) then |
996ae0b0 RK |
3534 | Ent := Entity (P); |
3535 | ||
3536 | if Ekind (Ent) /= E_Entry then | |
3537 | Error_Attr ("invalid entry name", N); | |
3538 | end if; | |
3539 | ||
3540 | elsif Nkind (P) = N_Indexed_Component then | |
07fc65c4 | 3541 | if not Is_Entity_Name (Prefix (P)) |
1155ae01 | 3542 | or else No (Entity (Prefix (P))) |
07fc65c4 GB |
3543 | or else Ekind (Entity (Prefix (P))) /= E_Entry_Family |
3544 | then | |
3545 | if Nkind (Prefix (P)) = N_Selected_Component | |
3546 | and then Present (Entity (Selector_Name (Prefix (P)))) | |
3547 | and then Ekind (Entity (Selector_Name (Prefix (P)))) = | |
3548 | E_Entry_Family | |
3549 | then | |
3550 | Error_Attr | |
3551 | ("attribute % must apply to entry of current task", P); | |
996ae0b0 | 3552 | |
07fc65c4 GB |
3553 | else |
3554 | Error_Attr ("invalid entry family name", P); | |
3555 | end if; | |
996ae0b0 | 3556 | return; |
07fc65c4 GB |
3557 | |
3558 | else | |
3559 | Ent := Entity (Prefix (P)); | |
996ae0b0 RK |
3560 | end if; |
3561 | ||
07fc65c4 GB |
3562 | elsif Nkind (P) = N_Selected_Component |
3563 | and then Present (Entity (Selector_Name (P))) | |
3564 | and then Ekind (Entity (Selector_Name (P))) = E_Entry | |
3565 | then | |
3566 | Error_Attr | |
3567 | ("attribute % must apply to entry of current task", P); | |
3568 | ||
996ae0b0 RK |
3569 | else |
3570 | Error_Attr ("invalid entry name", N); | |
3571 | return; | |
3572 | end if; | |
3573 | ||
3574 | for J in reverse 0 .. Scope_Stack.Last loop | |
3575 | S := Scope_Stack.Table (J).Entity; | |
3576 | ||
3577 | if S = Scope (Ent) then | |
3578 | if Nkind (P) = N_Expanded_Name then | |
3579 | Tsk := Entity (Prefix (P)); | |
3580 | ||
3581 | -- The prefix denotes either the task type, or else a | |
3582 | -- single task whose task type is being analyzed. | |
3583 | ||
b80a2b4b | 3584 | if (Is_Type (Tsk) and then Tsk = S) |
996ae0b0 | 3585 | or else (not Is_Type (Tsk) |
b80a2b4b AC |
3586 | and then Etype (Tsk) = S |
3587 | and then not (Comes_From_Source (S))) | |
996ae0b0 RK |
3588 | then |
3589 | null; | |
3590 | else | |
07fc65c4 GB |
3591 | Error_Attr |
3592 | ("Attribute % must apply to entry of current task", N); | |
996ae0b0 RK |
3593 | end if; |
3594 | end if; | |
3595 | ||
3596 | exit; | |
3597 | ||
3598 | elsif Ekind (Scope (Ent)) in Task_Kind | |
d8f43ee6 HK |
3599 | and then not Ekind_In (S, E_Block, |
3600 | E_Entry, | |
3601 | E_Entry_Family, | |
3602 | E_Loop) | |
996ae0b0 | 3603 | then |
07fc65c4 | 3604 | Error_Attr ("Attribute % cannot appear in inner unit", N); |
996ae0b0 RK |
3605 | |
3606 | elsif Ekind (Scope (Ent)) = E_Protected_Type | |
3607 | and then not Has_Completion (Scope (Ent)) | |
3608 | then | |
3609 | Error_Attr ("attribute % can only be used inside body", N); | |
3610 | end if; | |
3611 | end loop; | |
3612 | ||
3613 | if Is_Overloaded (P) then | |
3614 | declare | |
3615 | Index : Interp_Index; | |
3616 | It : Interp; | |
3617 | ||
3618 | begin | |
3619 | Get_First_Interp (P, Index, It); | |
996ae0b0 RK |
3620 | while Present (It.Nam) loop |
3621 | if It.Nam = Ent then | |
3622 | null; | |
3623 | ||
edd63e9b ES |
3624 | -- Ada 2005 (AI-345): Do not consider primitive entry |
3625 | -- wrappers generated for task or protected types. | |
3626 | ||
0791fbe9 | 3627 | elsif Ada_Version >= Ada_2005 |
edd63e9b ES |
3628 | and then not Comes_From_Source (It.Nam) |
3629 | then | |
3630 | null; | |
3631 | ||
996ae0b0 | 3632 | else |
fbf5a39b | 3633 | Error_Attr ("ambiguous entry name", N); |
996ae0b0 RK |
3634 | end if; |
3635 | ||
3636 | Get_Next_Interp (Index, It); | |
3637 | end loop; | |
3638 | end; | |
3639 | end if; | |
3640 | ||
3641 | Set_Etype (N, Universal_Integer); | |
3642 | end Count; | |
3643 | ||
3644 | ----------------------- | |
3645 | -- Default_Bit_Order -- | |
3646 | ----------------------- | |
3647 | ||
e477d718 | 3648 | when Attribute_Default_Bit_Order => Default_Bit_Order : declare |
7ed57189 | 3649 | Target_Default_Bit_Order : System.Bit_Order; |
e477d718 | 3650 | |
996ae0b0 RK |
3651 | begin |
3652 | Check_Standard_Prefix; | |
996ae0b0 RK |
3653 | |
3654 | if Bytes_Big_Endian then | |
7ed57189 | 3655 | Target_Default_Bit_Order := System.High_Order_First; |
996ae0b0 | 3656 | else |
7ed57189 | 3657 | Target_Default_Bit_Order := System.Low_Order_First; |
996ae0b0 RK |
3658 | end if; |
3659 | ||
7ed57189 AC |
3660 | Rewrite (N, |
3661 | Make_Integer_Literal (Loc, | |
3662 | UI_From_Int (System.Bit_Order'Pos (Target_Default_Bit_Order)))); | |
3663 | ||
996ae0b0 RK |
3664 | Set_Etype (N, Universal_Integer); |
3665 | Set_Is_Static_Expression (N); | |
3666 | end Default_Bit_Order; | |
3667 | ||
7ed57189 AC |
3668 | ---------------------------------- |
3669 | -- Default_Scalar_Storage_Order -- | |
3670 | ---------------------------------- | |
3671 | ||
3672 | when Attribute_Default_Scalar_Storage_Order => Default_SSO : declare | |
3673 | RE_Default_SSO : RE_Id; | |
e477d718 | 3674 | |
7ed57189 AC |
3675 | begin |
3676 | Check_Standard_Prefix; | |
3677 | ||
3678 | case Opt.Default_SSO is | |
3679 | when ' ' => | |
3680 | if Bytes_Big_Endian then | |
3681 | RE_Default_SSO := RE_High_Order_First; | |
3682 | else | |
3683 | RE_Default_SSO := RE_Low_Order_First; | |
3684 | end if; | |
e477d718 | 3685 | |
7ed57189 AC |
3686 | when 'H' => |
3687 | RE_Default_SSO := RE_High_Order_First; | |
e477d718 | 3688 | |
7ed57189 AC |
3689 | when 'L' => |
3690 | RE_Default_SSO := RE_Low_Order_First; | |
e477d718 | 3691 | |
7ed57189 AC |
3692 | when others => |
3693 | raise Program_Error; | |
3694 | end case; | |
3695 | ||
3696 | Rewrite (N, New_Occurrence_Of (RTE (RE_Default_SSO), Loc)); | |
3697 | end Default_SSO; | |
3698 | ||
996ae0b0 RK |
3699 | -------------- |
3700 | -- Definite -- | |
3701 | -------------- | |
3702 | ||
3703 | when Attribute_Definite => | |
3704 | Legal_Formal_Attribute; | |
3705 | ||
3706 | ----------- | |
3707 | -- Delta -- | |
3708 | ----------- | |
3709 | ||
3710 | when Attribute_Delta => | |
3711 | Check_Fixed_Point_Type_0; | |
3712 | Set_Etype (N, Universal_Real); | |
3713 | ||
3714 | ------------ | |
3715 | -- Denorm -- | |
3716 | ------------ | |
3717 | ||
3718 | when Attribute_Denorm => | |
3719 | Check_Floating_Point_Type_0; | |
3720 | Set_Etype (N, Standard_Boolean); | |
3721 | ||
eaed2a2c AC |
3722 | ----------- |
3723 | -- Deref -- | |
3724 | ----------- | |
3725 | ||
3726 | when Attribute_Deref => | |
3727 | Check_Type; | |
3728 | Check_E1; | |
3729 | Resolve (E1, RTE (RE_Address)); | |
3730 | Set_Etype (N, P_Type); | |
3731 | ||
203ddcea AC |
3732 | --------------------- |
3733 | -- Descriptor_Size -- | |
3734 | --------------------- | |
3735 | ||
3736 | when Attribute_Descriptor_Size => | |
3737 | Check_E0; | |
3738 | ||
b80a2b4b | 3739 | if not Is_Entity_Name (P) or else not Is_Type (Entity (P)) then |
cb3d8731 | 3740 | Error_Attr_P ("prefix of attribute % must denote a type"); |
203ddcea AC |
3741 | end if; |
3742 | ||
3743 | Set_Etype (N, Universal_Integer); | |
3744 | ||
996ae0b0 RK |
3745 | ------------ |
3746 | -- Digits -- | |
3747 | ------------ | |
3748 | ||
3749 | when Attribute_Digits => | |
3750 | Check_E0; | |
3751 | Check_Type; | |
3752 | ||
3753 | if not Is_Floating_Point_Type (P_Type) | |
3754 | and then not Is_Decimal_Fixed_Point_Type (P_Type) | |
3755 | then | |
822033eb HK |
3756 | Error_Attr_P |
3757 | ("prefix of % attribute must be float or decimal type"); | |
996ae0b0 RK |
3758 | end if; |
3759 | ||
3760 | Set_Etype (N, Universal_Integer); | |
3761 | ||
3762 | --------------- | |
3763 | -- Elab_Body -- | |
3764 | --------------- | |
3765 | ||
2c1a2cf3 | 3766 | -- Also handles processing for Elab_Spec and Elab_Subp_Body |
996ae0b0 | 3767 | |
d8f43ee6 HK |
3768 | when Attribute_Elab_Body |
3769 | | Attribute_Elab_Spec | |
3770 | | Attribute_Elab_Subp_Body | |
3771 | => | |
996ae0b0 RK |
3772 | Check_E0; |
3773 | Check_Unit_Name (P); | |
3774 | Set_Etype (N, Standard_Void_Type); | |
3775 | ||
3776 | -- We have to manually call the expander in this case to get | |
3777 | -- the necessary expansion (normally attributes that return | |
3778 | -- entities are not expanded). | |
3779 | ||
3780 | Expand (N); | |
3781 | ||
3782 | --------------- | |
3783 | -- Elab_Spec -- | |
3784 | --------------- | |
3785 | ||
3786 | -- Shares processing with Elab_Body | |
3787 | ||
3788 | ---------------- | |
3789 | -- Elaborated -- | |
3790 | ---------------- | |
3791 | ||
3792 | when Attribute_Elaborated => | |
3793 | Check_E0; | |
824e9320 | 3794 | Check_Unit_Name (P); |
996ae0b0 RK |
3795 | Set_Etype (N, Standard_Boolean); |
3796 | ||
3797 | ---------- | |
3798 | -- Emax -- | |
3799 | ---------- | |
3800 | ||
3801 | when Attribute_Emax => | |
3802 | Check_Floating_Point_Type_0; | |
3803 | Set_Etype (N, Universal_Integer); | |
3804 | ||
442ade9d RD |
3805 | ------------- |
3806 | -- Enabled -- | |
3807 | ------------- | |
3808 | ||
3809 | when Attribute_Enabled => | |
3810 | Check_Either_E0_Or_E1; | |
3811 | ||
3812 | if Present (E1) then | |
3813 | if not Is_Entity_Name (E1) or else No (Entity (E1)) then | |
3814 | Error_Msg_N ("entity name expected for Enabled attribute", E1); | |
3815 | E1 := Empty; | |
3816 | end if; | |
3817 | end if; | |
3818 | ||
3819 | if Nkind (P) /= N_Identifier then | |
3820 | Error_Msg_N ("identifier expected (check name)", P); | |
442ade9d RD |
3821 | elsif Get_Check_Id (Chars (P)) = No_Check_Id then |
3822 | Error_Msg_N ("& is not a recognized check name", P); | |
3823 | end if; | |
3824 | ||
3825 | Set_Etype (N, Standard_Boolean); | |
3826 | ||
996ae0b0 RK |
3827 | -------------- |
3828 | -- Enum_Rep -- | |
3829 | -------------- | |
3830 | ||
d8f43ee6 | 3831 | when Attribute_Enum_Rep => |
3e720c96 | 3832 | |
d6fd1f07 AC |
3833 | -- T'Enum_Rep (X) case |
3834 | ||
996ae0b0 RK |
3835 | if Present (E1) then |
3836 | Check_E1; | |
3837 | Check_Discrete_Type; | |
3838 | Resolve (E1, P_Base_Type); | |
75e4e36d | 3839 | |
7029d96f ES |
3840 | -- X'Enum_Rep case. X must be an object or enumeration literal |
3841 | -- (including an attribute reference), and it must be of a | |
3842 | -- discrete type. | |
d6fd1f07 | 3843 | |
3e720c96 HK |
3844 | elsif not |
3845 | ((Is_Object_Reference (P) | |
3846 | or else | |
3847 | (Is_Entity_Name (P) | |
7029d96f ES |
3848 | and then Ekind (Entity (P)) = E_Enumeration_Literal) |
3849 | or else Nkind (P) = N_Attribute_Reference) | |
3e720c96 | 3850 | and then Is_Discrete_Type (Etype (P))) |
d6fd1f07 AC |
3851 | then |
3852 | Error_Attr_P ("prefix of % attribute must be discrete object"); | |
996ae0b0 RK |
3853 | end if; |
3854 | ||
3855 | Set_Etype (N, Universal_Integer); | |
996ae0b0 | 3856 | |
21d27997 RD |
3857 | -------------- |
3858 | -- Enum_Val -- | |
3859 | -------------- | |
3860 | ||
d8f43ee6 | 3861 | when Attribute_Enum_Val => |
21d27997 RD |
3862 | Check_E1; |
3863 | Check_Type; | |
3864 | ||
3865 | if not Is_Enumeration_Type (P_Type) then | |
3866 | Error_Attr_P ("prefix of % attribute must be enumeration type"); | |
3867 | end if; | |
3868 | ||
3869 | -- If the enumeration type has a standard representation, the effect | |
3870 | -- is the same as 'Val, so rewrite the attribute as a 'Val. | |
3871 | ||
3872 | if not Has_Non_Standard_Rep (P_Base_Type) then | |
3873 | Rewrite (N, | |
3874 | Make_Attribute_Reference (Loc, | |
3875 | Prefix => Relocate_Node (Prefix (N)), | |
3876 | Attribute_Name => Name_Val, | |
3877 | Expressions => New_List (Relocate_Node (E1)))); | |
3878 | Analyze_And_Resolve (N, P_Base_Type); | |
3879 | ||
3880 | -- Non-standard representation case (enumeration with holes) | |
3881 | ||
3882 | else | |
3883 | Check_Enum_Image; | |
3884 | Resolve (E1, Any_Integer); | |
3885 | Set_Etype (N, P_Base_Type); | |
3886 | end if; | |
21d27997 | 3887 | |
996ae0b0 RK |
3888 | ------------- |
3889 | -- Epsilon -- | |
3890 | ------------- | |
3891 | ||
3892 | when Attribute_Epsilon => | |
3893 | Check_Floating_Point_Type_0; | |
3894 | Set_Etype (N, Universal_Real); | |
3895 | ||
3896 | -------------- | |
3897 | -- Exponent -- | |
3898 | -------------- | |
3899 | ||
3900 | when Attribute_Exponent => | |
3901 | Check_Floating_Point_Type_1; | |
3902 | Set_Etype (N, Universal_Integer); | |
3903 | Resolve (E1, P_Base_Type); | |
3904 | ||
3905 | ------------------ | |
3906 | -- External_Tag -- | |
3907 | ------------------ | |
3908 | ||
3909 | when Attribute_External_Tag => | |
3910 | Check_E0; | |
3911 | Check_Type; | |
3912 | ||
3913 | Set_Etype (N, Standard_String); | |
3914 | ||
3915 | if not Is_Tagged_Type (P_Type) then | |
822033eb | 3916 | Error_Attr_P ("prefix of % attribute must be tagged"); |
996ae0b0 RK |
3917 | end if; |
3918 | ||
7b76e805 RD |
3919 | --------------- |
3920 | -- Fast_Math -- | |
3921 | --------------- | |
3922 | ||
3923 | when Attribute_Fast_Math => | |
7b76e805 | 3924 | Check_Standard_Prefix; |
21791d97 | 3925 | Rewrite (N, New_Occurrence_Of (Boolean_Literals (Fast_Math), Loc)); |
7b76e805 | 3926 | |
f68d3344 JS |
3927 | ----------------------- |
3928 | -- Finalization_Size -- | |
3929 | ----------------------- | |
3930 | ||
3931 | when Attribute_Finalization_Size => | |
3932 | Check_E0; | |
5e127570 | 3933 | |
9ca67d3f ES |
3934 | -- The prefix denotes an object |
3935 | ||
5e127570 | 3936 | if Is_Object_Reference (P) then |
5e127570 AC |
3937 | Check_Object_Reference (P); |
3938 | ||
ffa168bc | 3939 | -- The prefix denotes a type |
9ca67d3f ES |
3940 | |
3941 | elsif Is_Entity_Name (P) and then Is_Type (Entity (P)) then | |
5e127570 AC |
3942 | Check_Type; |
3943 | Check_Not_Incomplete_Type; | |
ffa168bc AC |
3944 | |
3945 | -- Attribute 'Finalization_Size is not defined for class-wide | |
3946 | -- types because it is not possible to know statically whether | |
3947 | -- a definite type will have controlled components or not. | |
3948 | ||
5e127570 | 3949 | if Is_Class_Wide_Type (Etype (P)) then |
9ca67d3f ES |
3950 | Error_Attr_P |
3951 | ("prefix of % attribute cannot denote a class-wide type"); | |
5e127570 | 3952 | end if; |
9ca67d3f | 3953 | |
ffa168bc | 3954 | -- The prefix denotes an illegal construct |
9ca67d3f ES |
3955 | |
3956 | else | |
3957 | Error_Attr_P | |
3958 | ("prefix of % attribute must be a definite type or an object"); | |
5e127570 AC |
3959 | end if; |
3960 | ||
f68d3344 JS |
3961 | Set_Etype (N, Universal_Integer); |
3962 | ||
996ae0b0 RK |
3963 | ----------- |
3964 | -- First -- | |
3965 | ----------- | |
3966 | ||
3967 | when Attribute_First => | |
3968 | Check_Array_Or_Scalar_Type; | |
26df19ce | 3969 | Bad_Attribute_For_Predicate; |
996ae0b0 RK |
3970 | |
3971 | --------------- | |
3972 | -- First_Bit -- | |
3973 | --------------- | |
3974 | ||
3975 | when Attribute_First_Bit => | |
3976 | Check_Component; | |
3977 | Set_Etype (N, Universal_Integer); | |
3978 | ||
011f9d5d AC |
3979 | ----------------- |
3980 | -- First_Valid -- | |
3981 | ----------------- | |
3982 | ||
3983 | when Attribute_First_Valid => | |
3984 | Check_First_Last_Valid; | |
3985 | Set_Etype (N, P_Type); | |
3986 | ||
996ae0b0 RK |
3987 | ----------------- |
3988 | -- Fixed_Value -- | |
3989 | ----------------- | |
3990 | ||
3991 | when Attribute_Fixed_Value => | |
3992 | Check_E1; | |
3993 | Check_Fixed_Point_Type; | |
3994 | Resolve (E1, Any_Integer); | |
3995 | Set_Etype (N, P_Base_Type); | |
3996 | ||
3997 | ----------- | |
3998 | -- Floor -- | |
3999 | ----------- | |
4000 | ||
4001 | when Attribute_Floor => | |
4002 | Check_Floating_Point_Type_1; | |
4003 | Set_Etype (N, P_Base_Type); | |
4004 | Resolve (E1, P_Base_Type); | |
4005 | ||
4006 | ---------- | |
4007 | -- Fore -- | |
4008 | ---------- | |
4009 | ||
4010 | when Attribute_Fore => | |
4011 | Check_Fixed_Point_Type_0; | |
4012 | Set_Etype (N, Universal_Integer); | |
4013 | ||
4014 | -------------- | |
4015 | -- Fraction -- | |
4016 | -------------- | |
4017 | ||
4018 | when Attribute_Fraction => | |
4019 | Check_Floating_Point_Type_1; | |
4020 | Set_Etype (N, P_Base_Type); | |
4021 | Resolve (E1, P_Base_Type); | |
4022 | ||
54838d1f AC |
4023 | -------------- |
4024 | -- From_Any -- | |
4025 | -------------- | |
4026 | ||
4027 | when Attribute_From_Any => | |
4028 | Check_E1; | |
4029 | Check_PolyORB_Attribute; | |
4030 | Set_Etype (N, P_Base_Type); | |
4031 | ||
15ce9ca2 AC |
4032 | ----------------------- |
4033 | -- Has_Access_Values -- | |
4034 | ----------------------- | |
4035 | ||
4036 | when Attribute_Has_Access_Values => | |
4037 | Check_Type; | |
4038 | Check_E0; | |
4039 | Set_Etype (N, Standard_Boolean); | |
4040 | ||
ea70f3d0 RD |
4041 | ---------------------- |
4042 | -- Has_Same_Storage -- | |
4043 | ---------------------- | |
4044 | ||
4045 | when Attribute_Has_Same_Storage => | |
ea70f3d0 RD |
4046 | Check_E1; |
4047 | ||
4048 | -- The arguments must be objects of any type | |
4049 | ||
4050 | Analyze_And_Resolve (P); | |
4051 | Analyze_And_Resolve (E1); | |
4052 | Check_Object_Reference (P); | |
4053 | Check_Object_Reference (E1); | |
4054 | Set_Etype (N, Standard_Boolean); | |
4055 | ||
21d27997 RD |
4056 | ----------------------- |
4057 | -- Has_Tagged_Values -- | |
4058 | ----------------------- | |
4059 | ||
4060 | when Attribute_Has_Tagged_Values => | |
4061 | Check_Type; | |
4062 | Check_E0; | |
4063 | Set_Etype (N, Standard_Boolean); | |
4064 | ||
996ae0b0 RK |
4065 | ----------------------- |
4066 | -- Has_Discriminants -- | |
4067 | ----------------------- | |
4068 | ||
4069 | when Attribute_Has_Discriminants => | |
4070 | Legal_Formal_Attribute; | |
4071 | ||
4072 | -------------- | |
4073 | -- Identity -- | |
4074 | -------------- | |
4075 | ||
4076 | when Attribute_Identity => | |
4077 | Check_E0; | |
4078 | Analyze (P); | |
4079 | ||
1b1d88b1 | 4080 | if Etype (P) = Standard_Exception_Type then |
996ae0b0 RK |
4081 | Set_Etype (N, RTE (RE_Exception_Id)); |
4082 | ||
b80a2b4b AC |
4083 | -- Ada 2005 (AI-345): Attribute 'Identity may be applied to task |
4084 | -- interface class-wide types. | |
65f01153 | 4085 | |
996ae0b0 RK |
4086 | elsif Is_Task_Type (Etype (P)) |
4087 | or else (Is_Access_Type (Etype (P)) | |
65f01153 | 4088 | and then Is_Task_Type (Designated_Type (Etype (P)))) |
0791fbe9 | 4089 | or else (Ada_Version >= Ada_2005 |
65f01153 RD |
4090 | and then Ekind (Etype (P)) = E_Class_Wide_Type |
4091 | and then Is_Interface (Etype (P)) | |
4092 | and then Is_Task_Interface (Etype (P))) | |
996ae0b0 | 4093 | then |
fbf5a39b | 4094 | Resolve (P); |
b5e792e2 | 4095 | Set_Etype (N, RTE (RO_AT_Task_Id)); |
996ae0b0 RK |
4096 | |
4097 | else | |
0791fbe9 | 4098 | if Ada_Version >= Ada_2005 then |
822033eb | 4099 | Error_Attr_P |
d8f43ee6 HK |
4100 | ("prefix of % attribute must be an exception, a task or a " |
4101 | & "task interface class-wide object"); | |
65f01153 | 4102 | else |
822033eb HK |
4103 | Error_Attr_P |
4104 | ("prefix of % attribute must be a task or an exception"); | |
65f01153 | 4105 | end if; |
996ae0b0 RK |
4106 | end if; |
4107 | ||
4108 | ----------- | |
4109 | -- Image -- | |
4110 | ----------- | |
4111 | ||
d8f43ee6 | 4112 | when Attribute_Image => |
996ae0b0 | 4113 | if Is_Real_Type (P_Type) then |
0ab80019 | 4114 | if Ada_Version = Ada_83 and then Comes_From_Source (N) then |
996ae0b0 RK |
4115 | Error_Msg_Name_1 := Aname; |
4116 | Error_Msg_N | |
4117 | ("(Ada 83) % attribute not allowed for real types", N); | |
4118 | end if; | |
4119 | end if; | |
4120 | ||
b276ab7a | 4121 | Analyze_Image_Attribute (Standard_String); |
996ae0b0 RK |
4122 | |
4123 | --------- | |
4124 | -- Img -- | |
4125 | --------- | |
4126 | ||
d8f43ee6 | 4127 | when Attribute_Img => |
b276ab7a | 4128 | Analyze_Image_Attribute (Standard_String); |
996ae0b0 RK |
4129 | |
4130 | ----------- | |
4131 | -- Input -- | |
4132 | ----------- | |
4133 | ||
4134 | when Attribute_Input => | |
4135 | Check_E1; | |
fbf5a39b | 4136 | Check_Stream_Attribute (TSS_Stream_Input); |
996ae0b0 RK |
4137 | Set_Etype (N, P_Base_Type); |
4138 | ||
4139 | ------------------- | |
4140 | -- Integer_Value -- | |
4141 | ------------------- | |
4142 | ||
4143 | when Attribute_Integer_Value => | |
4144 | Check_E1; | |
4145 | Check_Integer_Type; | |
4146 | Resolve (E1, Any_Fixed); | |
5a218498 ST |
4147 | |
4148 | -- Signal an error if argument type is not a specific fixed-point | |
4149 | -- subtype. An error has been signalled already if the argument | |
4150 | -- was not of a fixed-point type. | |
4151 | ||
4152 | if Etype (E1) = Any_Fixed and then not Error_Posted (E1) then | |
4153 | Error_Attr ("argument of % must be of a fixed-point type", E1); | |
4154 | end if; | |
4155 | ||
996ae0b0 RK |
4156 | Set_Etype (N, P_Base_Type); |
4157 | ||
21d27997 RD |
4158 | ------------------- |
4159 | -- Invalid_Value -- | |
4160 | ------------------- | |
4161 | ||
4162 | when Attribute_Invalid_Value => | |
4163 | Check_E0; | |
4164 | Check_Scalar_Type; | |
4165 | Set_Etype (N, P_Base_Type); | |
4166 | Invalid_Value_Used := True; | |
4167 | ||
996ae0b0 RK |
4168 | ----------- |
4169 | -- Large -- | |
4170 | ----------- | |
4171 | ||
4172 | when Attribute_Large => | |
4173 | Check_E0; | |
4174 | Check_Real_Type; | |
4175 | Set_Etype (N, Universal_Real); | |
4176 | ||
4177 | ---------- | |
4178 | -- Last -- | |
4179 | ---------- | |
4180 | ||
4181 | when Attribute_Last => | |
4182 | Check_Array_Or_Scalar_Type; | |
26df19ce | 4183 | Bad_Attribute_For_Predicate; |
996ae0b0 RK |
4184 | |
4185 | -------------- | |
4186 | -- Last_Bit -- | |
4187 | -------------- | |
4188 | ||
4189 | when Attribute_Last_Bit => | |
4190 | Check_Component; | |
4191 | Set_Etype (N, Universal_Integer); | |
4192 | ||
011f9d5d AC |
4193 | ---------------- |
4194 | -- Last_Valid -- | |
4195 | ---------------- | |
4196 | ||
4197 | when Attribute_Last_Valid => | |
4198 | Check_First_Last_Valid; | |
4199 | Set_Etype (N, P_Type); | |
4200 | ||
996ae0b0 RK |
4201 | ------------------ |
4202 | -- Leading_Part -- | |
4203 | ------------------ | |
4204 | ||
4205 | when Attribute_Leading_Part => | |
4206 | Check_Floating_Point_Type_2; | |
4207 | Set_Etype (N, P_Base_Type); | |
4208 | Resolve (E1, P_Base_Type); | |
4209 | Resolve (E2, Any_Integer); | |
4210 | ||
4211 | ------------ | |
4212 | -- Length -- | |
4213 | ------------ | |
4214 | ||
4215 | when Attribute_Length => | |
4216 | Check_Array_Type; | |
4217 | Set_Etype (N, Universal_Integer); | |
4218 | ||
f7ea2603 RD |
4219 | ------------------- |
4220 | -- Library_Level -- | |
4221 | ------------------- | |
4222 | ||
4223 | when Attribute_Library_Level => | |
4224 | Check_E0; | |
cf3b97ef AC |
4225 | |
4226 | if not Is_Entity_Name (P) then | |
4227 | Error_Attr_P ("prefix of % attribute must be an entity name"); | |
4228 | end if; | |
f7ea2603 RD |
4229 | |
4230 | if not Inside_A_Generic then | |
4231 | Set_Boolean_Result (N, | |
cf3b97ef | 4232 | Is_Library_Level_Entity (Entity (P))); |
f7ea2603 RD |
4233 | end if; |
4234 | ||
4235 | Set_Etype (N, Standard_Boolean); | |
4236 | ||
2a290fec AC |
4237 | --------------- |
4238 | -- Lock_Free -- | |
4239 | --------------- | |
4240 | ||
4241 | when Attribute_Lock_Free => | |
4242 | Check_E0; | |
4243 | Set_Etype (N, Standard_Boolean); | |
4244 | ||
4245 | if not Is_Protected_Type (P_Type) then | |
4246 | Error_Attr_P | |
4247 | ("prefix of % attribute must be a protected object"); | |
4248 | end if; | |
4249 | ||
150ac76e AC |
4250 | ---------------- |
4251 | -- Loop_Entry -- | |
4252 | ---------------- | |
4253 | ||
4254 | when Attribute_Loop_Entry => Loop_Entry : declare | |
4255 | procedure Check_References_In_Prefix (Loop_Id : Entity_Id); | |
4256 | -- Inspect the prefix for any uses of entities declared within the | |
4257 | -- related loop. Loop_Id denotes the loop identifier. | |
4258 | ||
4259 | -------------------------------- | |
4260 | -- Check_References_In_Prefix -- | |
4261 | -------------------------------- | |
4262 | ||
4263 | procedure Check_References_In_Prefix (Loop_Id : Entity_Id) is | |
4264 | Loop_Decl : constant Node_Id := Label_Construct (Parent (Loop_Id)); | |
4265 | ||
4266 | function Check_Reference (Nod : Node_Id) return Traverse_Result; | |
4267 | -- Determine whether a reference mentions an entity declared | |
4268 | -- within the related loop. | |
4269 | ||
4270 | function Declared_Within (Nod : Node_Id) return Boolean; | |
4271 | -- Determine whether Nod appears in the subtree of Loop_Decl | |
4272 | ||
4273 | --------------------- | |
4274 | -- Check_Reference -- | |
4275 | --------------------- | |
4276 | ||
4277 | function Check_Reference (Nod : Node_Id) return Traverse_Result is | |
4278 | begin | |
4279 | if Nkind (Nod) = N_Identifier | |
4280 | and then Present (Entity (Nod)) | |
4281 | and then Declared_Within (Declaration_Node (Entity (Nod))) | |
4282 | then | |
4283 | Error_Attr | |
4284 | ("prefix of attribute % cannot reference local entities", | |
4285 | Nod); | |
4286 | return Abandon; | |
4287 | else | |
4288 | return OK; | |
4289 | end if; | |
4290 | end Check_Reference; | |
4291 | ||
4292 | procedure Check_References is new Traverse_Proc (Check_Reference); | |
4293 | ||
4294 | --------------------- | |
4295 | -- Declared_Within -- | |
4296 | --------------------- | |
4297 | ||
4298 | function Declared_Within (Nod : Node_Id) return Boolean is | |
4299 | Stmt : Node_Id; | |
4300 | ||
4301 | begin | |
4302 | Stmt := Nod; | |
4303 | while Present (Stmt) loop | |
4304 | if Stmt = Loop_Decl then | |
4305 | return True; | |
4306 | ||
4307 | -- Prevent the search from going too far | |
4308 | ||
a7e68e7f | 4309 | elsif Is_Body_Or_Package_Declaration (Stmt) then |
150ac76e AC |
4310 | exit; |
4311 | end if; | |
4312 | ||
4313 | Stmt := Parent (Stmt); | |
4314 | end loop; | |
4315 | ||
4316 | return False; | |
4317 | end Declared_Within; | |
4318 | ||
4319 | -- Start of processing for Check_Prefix_For_Local_References | |
4320 | ||
4321 | begin | |
4322 | Check_References (P); | |
4323 | end Check_References_In_Prefix; | |
4324 | ||
4325 | -- Local variables | |
4326 | ||
0f83b044 AC |
4327 | Context : constant Node_Id := Parent (N); |
4328 | Attr : Node_Id; | |
66c19cd4 | 4329 | Encl_Loop : Node_Id := Empty; |
0f83b044 AC |
4330 | Encl_Prag : Node_Id := Empty; |
4331 | Loop_Id : Entity_Id := Empty; | |
4332 | Scop : Entity_Id; | |
4333 | Stmt : Node_Id; | |
150ac76e AC |
4334 | |
4335 | -- Start of processing for Loop_Entry | |
4336 | ||
4337 | begin | |
3d67b239 AC |
4338 | Attr := N; |
4339 | ||
211e7410 | 4340 | -- Set the type of the attribute now to ensure the successful |
3d67b239 AC |
4341 | -- continuation of analysis even if the attribute is misplaced. |
4342 | ||
4343 | Set_Etype (Attr, P_Type); | |
4344 | ||
24778dbb | 4345 | -- Attribute 'Loop_Entry may appear in several flavors: |
739e7bbf | 4346 | |
24778dbb AC |
4347 | -- * Prefix'Loop_Entry - in this form, the attribute applies to the |
4348 | -- nearest enclosing loop. | |
739e7bbf | 4349 | |
24778dbb AC |
4350 | -- * Prefix'Loop_Entry (Expr) - depending on what Expr denotes, the |
4351 | -- attribute may be related to a loop denoted by label Expr or | |
4352 | -- the prefix may denote an array object and Expr may act as an | |
4353 | -- indexed component. | |
739e7bbf | 4354 | |
24778dbb AC |
4355 | -- * Prefix'Loop_Entry (Expr1, ..., ExprN) - the attribute applies |
4356 | -- to the nearest enclosing loop, all expressions are part of | |
4357 | -- an indexed component. | |
739e7bbf | 4358 | |
24778dbb AC |
4359 | -- * Prefix'Loop_Entry (Expr) (...) (...) - depending on what Expr |
4360 | -- denotes, the attribute may be related to a loop denoted by | |
4361 | -- label Expr or the prefix may denote a multidimensional array | |
4362 | -- array object and Expr along with the rest of the expressions | |
4363 | -- may act as indexed components. | |
739e7bbf | 4364 | |
24778dbb AC |
4365 | -- Regardless of variations, the attribute reference does not have an |
4366 | -- expression list. Instead, all available expressions are stored as | |
4367 | -- indexed components. | |
739e7bbf | 4368 | |
24778dbb AC |
4369 | -- When the attribute is part of an indexed component, find the first |
4370 | -- expression as it will determine the semantics of 'Loop_Entry. | |
739e7bbf | 4371 | |
6376a3c6 AC |
4372 | -- If the attribute is itself an index in an indexed component, i.e. |
4373 | -- a member of a list, the context itself is not relevant (the code | |
4374 | -- below would lead to an infinite loop) and the attribute applies | |
4375 | -- to the enclosing loop. | |
4376 | ||
4377 | if Nkind (Context) = N_Indexed_Component | |
4378 | and then not Is_List_Member (N) | |
4379 | then | |
24778dbb AC |
4380 | E1 := First (Expressions (Context)); |
4381 | E2 := Next (E1); | |
739e7bbf | 4382 | |
24778dbb AC |
4383 | -- The attribute reference appears in the following form: |
4384 | ||
4385 | -- Prefix'Loop_Entry (Exp1, Expr2, ..., ExprN) [(...)] | |
4386 | ||
4387 | -- In this case, the loop name is omitted and no rewriting is | |
4388 | -- required. | |
4389 | ||
4390 | if Present (E2) then | |
4391 | null; | |
4392 | ||
4393 | -- The form of the attribute is: | |
739e7bbf | 4394 | |
24778dbb AC |
4395 | -- Prefix'Loop_Entry (Expr) [(...)] |
4396 | ||
4397 | -- If Expr denotes a loop entry, the whole attribute and indexed | |
4398 | -- component will have to be rewritten to reflect this relation. | |
739e7bbf AC |
4399 | |
4400 | else | |
24778dbb AC |
4401 | pragma Assert (Present (E1)); |
4402 | ||
4403 | -- Do not expand the expression as it may have side effects. | |
4404 | -- Simply preanalyze to determine whether it is a loop name or | |
4405 | -- something else. | |
4406 | ||
4407 | Preanalyze_And_Resolve (E1); | |
4408 | ||
4409 | if Is_Entity_Name (E1) | |
4410 | and then Present (Entity (E1)) | |
4411 | and then Ekind (Entity (E1)) = E_Loop | |
4412 | then | |
4413 | Loop_Id := Entity (E1); | |
4414 | ||
4415 | -- Transform the attribute and enclosing indexed component | |
4416 | ||
4417 | Set_Expressions (N, Expressions (Context)); | |
4418 | Rewrite (Context, N); | |
4419 | Set_Etype (Context, P_Type); | |
3d67b239 AC |
4420 | |
4421 | Attr := Context; | |
24778dbb | 4422 | end if; |
739e7bbf AC |
4423 | end if; |
4424 | end if; | |
150ac76e AC |
4425 | |
4426 | -- The prefix must denote an object | |
4427 | ||
4428 | if not Is_Object_Reference (P) then | |
4429 | Error_Attr_P ("prefix of attribute % must denote an object"); | |
4430 | end if; | |
4431 | ||
4432 | -- The prefix cannot be of a limited type because the expansion of | |
4433 | -- Loop_Entry must create a constant initialized by the evaluated | |
4434 | -- prefix. | |
4435 | ||
51245e2d | 4436 | if Is_Limited_View (Etype (P)) then |
150ac76e AC |
4437 | Error_Attr_P ("prefix of attribute % cannot be limited"); |
4438 | end if; | |
4439 | ||
150ac76e AC |
4440 | -- Climb the parent chain to verify the location of the attribute and |
4441 | -- find the enclosing loop. | |
4442 | ||
3d67b239 | 4443 | Stmt := Attr; |
150ac76e AC |
4444 | while Present (Stmt) loop |
4445 | ||
65441a1e RD |
4446 | -- Locate the corresponding enclosing pragma. Note that in the |
4447 | -- case of Assert[And_Cut] and Assume, we have already checked | |
4448 | -- that the pragma appears in an appropriate loop location. | |
150ac76e AC |
4449 | |
4450 | if Nkind (Original_Node (Stmt)) = N_Pragma | |
6e759c2a | 4451 | and then Nam_In (Pragma_Name_Unmapped (Original_Node (Stmt)), |
65441a1e RD |
4452 | Name_Loop_Invariant, |
4453 | Name_Loop_Variant, | |
4454 | Name_Assert, | |
4455 | Name_Assert_And_Cut, | |
4456 | Name_Assume) | |
150ac76e | 4457 | then |
0f83b044 | 4458 | Encl_Prag := Original_Node (Stmt); |
150ac76e AC |
4459 | |
4460 | -- Locate the enclosing loop (if any). Note that Ada 2012 array | |
4461 | -- iteration may be expanded into several nested loops, we are | |
03a72cd3 AC |
4462 | -- interested in the outermost one which has the loop identifier, |
4463 | -- and comes from source. | |
150ac76e AC |
4464 | |
4465 | elsif Nkind (Stmt) = N_Loop_Statement | |
4466 | and then Present (Identifier (Stmt)) | |
03a72cd3 AC |
4467 | and then Comes_From_Source (Original_Node (Stmt)) |
4468 | and then Nkind (Original_Node (Stmt)) = N_Loop_Statement | |
150ac76e | 4469 | then |
0f83b044 | 4470 | Encl_Loop := Stmt; |
739e7bbf AC |
4471 | |
4472 | -- The original attribute reference may lack a loop name. Use | |
4473 | -- the name of the enclosing loop because it is the related | |
4474 | -- loop. | |
4475 | ||
4476 | if No (Loop_Id) then | |
0f83b044 | 4477 | Loop_Id := Entity (Identifier (Encl_Loop)); |
739e7bbf AC |
4478 | end if; |
4479 | ||
150ac76e AC |
4480 | exit; |
4481 | ||
4482 | -- Prevent the search from going too far | |
4483 | ||
a7e68e7f | 4484 | elsif Is_Body_Or_Package_Declaration (Stmt) then |
150ac76e AC |
4485 | exit; |
4486 | end if; | |
4487 | ||
4488 | Stmt := Parent (Stmt); | |
4489 | end loop; | |
4490 | ||
f3bf0d9a HK |
4491 | -- Loop_Entry must appear within a Loop_Assertion pragma (Assert, |
4492 | -- Assert_And_Cut, Assume count as loop assertion pragmas for this | |
4493 | -- purpose if they appear in an appropriate location in a loop, | |
4494 | -- which was already checked by the top level pragma circuit). | |
150ac76e | 4495 | |
0289a8d7 AC |
4496 | -- Loop_Entry also denotes a value and as such can appear within an |
4497 | -- expression that is an argument for another loop aspect. In that | |
4498 | -- case it will have been expanded into the corresponding assignment. | |
4499 | ||
4500 | if Expander_Active | |
4501 | and then Nkind (Parent (N)) = N_Assignment_Statement | |
4502 | and then not Comes_From_Source (Parent (N)) | |
4503 | then | |
4504 | null; | |
4505 | ||
0f83b044 | 4506 | elsif No (Encl_Prag) then |
6782b1ef | 4507 | Error_Attr ("attribute% must appear within appropriate pragma", N); |
150ac76e AC |
4508 | end if; |
4509 | ||
6782b1ef | 4510 | -- A Loop_Entry that applies to a given loop statement must not |
150ac76e AC |
4511 | -- appear within a body of accept statement, if this construct is |
4512 | -- itself enclosed by the given loop statement. | |
4513 | ||
3d67b239 AC |
4514 | for Index in reverse 0 .. Scope_Stack.Last loop |
4515 | Scop := Scope_Stack.Table (Index).Entity; | |
150ac76e AC |
4516 | |
4517 | if Ekind (Scop) = E_Loop and then Scop = Loop_Id then | |
4518 | exit; | |
150ac76e AC |
4519 | elsif Ekind_In (Scop, E_Block, E_Loop, E_Return_Statement) then |
4520 | null; | |
150ac76e AC |
4521 | else |
4522 | Error_Attr | |
739e7bbf | 4523 | ("attribute % cannot appear in body or accept statement", N); |
150ac76e AC |
4524 | exit; |
4525 | end if; | |
4526 | end loop; | |
4527 | ||
4528 | -- The prefix cannot mention entities declared within the related | |
4529 | -- loop because they will not be visible once the prefix is moved | |
4530 | -- outside the loop. | |
4531 | ||
4532 | Check_References_In_Prefix (Loop_Id); | |
4533 | ||
4534 | -- The prefix must denote a static entity if the pragma does not | |
ea0f1fc8 AC |
4535 | -- apply to the innermost enclosing loop statement, or if it appears |
4536 | -- within a potentially unevaluated epxression. | |
150ac76e | 4537 | |
ea0f1fc8 AC |
4538 | if Is_Entity_Name (P) |
4539 | or else Nkind (Parent (P)) = N_Object_Renaming_Declaration | |
2df23f66 | 4540 | or else Statically_Denotes_Object (P) |
150ac76e | 4541 | then |
ea0f1fc8 AC |
4542 | null; |
4543 | ||
0f83b044 AC |
4544 | elsif Present (Encl_Loop) |
4545 | and then Entity (Identifier (Encl_Loop)) /= Loop_Id | |
ea0f1fc8 | 4546 | then |
6782b1ef | 4547 | Error_Attr_P |
bf0b0e5e AC |
4548 | ("prefix of attribute % that applies to outer loop must denote " |
4549 | & "an entity"); | |
ea0f1fc8 AC |
4550 | |
4551 | elsif Is_Potentially_Unevaluated (P) then | |
96e90ac1 | 4552 | Uneval_Old_Msg; |
6782b1ef AC |
4553 | end if; |
4554 | ||
bf0b0e5e AC |
4555 | -- Replace the Loop_Entry attribute reference by its prefix if the |
4556 | -- related pragma is ignored. This transformation is OK with respect | |
4557 | -- to typing because Loop_Entry's type is that of its prefix. This | |
4558 | -- early transformation also avoids the generation of a useless loop | |
4559 | -- entry constant. | |
6782b1ef | 4560 | |
0f83b044 | 4561 | if Present (Encl_Prag) and then Is_Ignored (Encl_Prag) then |
6782b1ef | 4562 | Rewrite (N, Relocate_Node (P)); |
50145b93 | 4563 | Preanalyze_And_Resolve (N); |
bf0b0e5e | 4564 | |
50145b93 AC |
4565 | else |
4566 | Preanalyze_And_Resolve (P); | |
4567 | end if; | |
150ac76e AC |
4568 | end Loop_Entry; |
4569 | ||
996ae0b0 RK |
4570 | ------------- |
4571 | -- Machine -- | |
4572 | ------------- | |
4573 | ||
4574 | when Attribute_Machine => | |
4575 | Check_Floating_Point_Type_1; | |
4576 | Set_Etype (N, P_Base_Type); | |
4577 | Resolve (E1, P_Base_Type); | |
4578 | ||
4579 | ------------------ | |
4580 | -- Machine_Emax -- | |
4581 | ------------------ | |
4582 | ||
4583 | when Attribute_Machine_Emax => | |
4584 | Check_Floating_Point_Type_0; | |
4585 | Set_Etype (N, Universal_Integer); | |
4586 | ||
4587 | ------------------ | |
4588 | -- Machine_Emin -- | |
4589 | ------------------ | |
4590 | ||
4591 | when Attribute_Machine_Emin => | |
4592 | Check_Floating_Point_Type_0; | |
4593 | Set_Etype (N, Universal_Integer); | |
4594 | ||
4595 | ---------------------- | |
4596 | -- Machine_Mantissa -- | |
4597 | ---------------------- | |
4598 | ||
4599 | when Attribute_Machine_Mantissa => | |
4600 | Check_Floating_Point_Type_0; | |
4601 | Set_Etype (N, Universal_Integer); | |
4602 | ||
4603 | ----------------------- | |
4604 | -- Machine_Overflows -- | |
4605 | ----------------------- | |
4606 | ||
4607 | when Attribute_Machine_Overflows => | |
4608 | Check_Real_Type; | |
4609 | Check_E0; | |
4610 | Set_Etype (N, Standard_Boolean); | |
4611 | ||
4612 | ------------------- | |
4613 | -- Machine_Radix -- | |
4614 | ------------------- | |
4615 | ||
4616 | when Attribute_Machine_Radix => | |
4617 | Check_Real_Type; | |
4618 | Check_E0; | |
4619 | Set_Etype (N, Universal_Integer); | |
4620 | ||
65f01153 RD |
4621 | ---------------------- |
4622 | -- Machine_Rounding -- | |
4623 | ---------------------- | |
4624 | ||
4625 | when Attribute_Machine_Rounding => | |
4626 | Check_Floating_Point_Type_1; | |
4627 | Set_Etype (N, P_Base_Type); | |
4628 | Resolve (E1, P_Base_Type); | |
4629 | ||
996ae0b0 RK |
4630 | -------------------- |
4631 | -- Machine_Rounds -- | |
4632 | -------------------- | |
4633 | ||
4634 | when Attribute_Machine_Rounds => | |
4635 | Check_Real_Type; | |
4636 | Check_E0; | |
4637 | Set_Etype (N, Standard_Boolean); | |
4638 | ||
4639 | ------------------ | |
4640 | -- Machine_Size -- | |
4641 | ------------------ | |
4642 | ||
4643 | when Attribute_Machine_Size => | |
4644 | Check_E0; | |
4645 | Check_Type; | |
4646 | Check_Not_Incomplete_Type; | |
4647 | Set_Etype (N, Universal_Integer); | |
4648 | ||
4649 | -------------- | |
4650 | -- Mantissa -- | |
4651 | -------------- | |
4652 | ||
4653 | when Attribute_Mantissa => | |
4654 | Check_E0; | |
4655 | Check_Real_Type; | |
4656 | Set_Etype (N, Universal_Integer); | |
4657 | ||
4658 | --------- | |
4659 | -- Max -- | |
4660 | --------- | |
4661 | ||
4662 | when Attribute_Max => | |
85d6bf87 | 4663 | Min_Max; |
996ae0b0 | 4664 | |
85d6bf87 AC |
4665 | ---------------------------------- |
4666 | -- Max_Alignment_For_Allocation -- | |
4667 | ---------------------------------- | |
428684fd | 4668 | |
85d6bf87 AC |
4669 | when Attribute_Max_Size_In_Storage_Elements => |
4670 | Max_Alignment_For_Allocation_Max_Size_In_Storage_Elements; | |
428684fd | 4671 | |
996ae0b0 RK |
4672 | ---------------------------------- |
4673 | -- Max_Size_In_Storage_Elements -- | |
4674 | ---------------------------------- | |
4675 | ||
85d6bf87 AC |
4676 | when Attribute_Max_Alignment_For_Allocation => |
4677 | Max_Alignment_For_Allocation_Max_Size_In_Storage_Elements; | |
996ae0b0 RK |
4678 | |
4679 | ----------------------- | |
4680 | -- Maximum_Alignment -- | |
4681 | ----------------------- | |
4682 | ||
4683 | when Attribute_Maximum_Alignment => | |
4684 | Standard_Attribute (Ttypes.Maximum_Alignment); | |
4685 | ||
4686 | -------------------- | |
4687 | -- Mechanism_Code -- | |
4688 | -------------------- | |
4689 | ||
4690 | when Attribute_Mechanism_Code => | |
996ae0b0 RK |
4691 | if not Is_Entity_Name (P) |
4692 | or else not Is_Subprogram (Entity (P)) | |
4693 | then | |
822033eb | 4694 | Error_Attr_P ("prefix of % attribute must be subprogram"); |
996ae0b0 RK |
4695 | end if; |
4696 | ||
4697 | Check_Either_E0_Or_E1; | |
4698 | ||
4699 | if Present (E1) then | |
4700 | Resolve (E1, Any_Integer); | |
4701 | Set_Etype (E1, Standard_Integer); | |
4702 | ||
edab6088 | 4703 | if not Is_OK_Static_Expression (E1) then |
fbf5a39b AC |
4704 | Flag_Non_Static_Expr |
4705 | ("expression for parameter number must be static!", E1); | |
4706 | Error_Attr; | |
996ae0b0 RK |
4707 | |
4708 | elsif UI_To_Int (Intval (E1)) > Number_Formals (Entity (P)) | |
4709 | or else UI_To_Int (Intval (E1)) < 0 | |
4710 | then | |
1b0b0f18 | 4711 | Error_Attr ("invalid parameter number for % attribute", E1); |
996ae0b0 RK |
4712 | end if; |
4713 | end if; | |
4714 | ||
4715 | Set_Etype (N, Universal_Integer); | |
4716 | ||
4717 | --------- | |
4718 | -- Min -- | |
4719 | --------- | |
4720 | ||
4721 | when Attribute_Min => | |
85d6bf87 | 4722 | Min_Max; |
428684fd | 4723 | |
5f3ab6fb AC |
4724 | --------- |
4725 | -- Mod -- | |
4726 | --------- | |
4727 | ||
4728 | when Attribute_Mod => | |
4729 | ||
4730 | -- Note: this attribute is only allowed in Ada 2005 mode, but | |
4731 | -- we do not need to test that here, since Mod is only recognized | |
4732 | -- as an attribute name in Ada 2005 mode during the parse. | |
4733 | ||
4734 | Check_E1; | |
4735 | Check_Modular_Integer_Type; | |
4736 | Resolve (E1, Any_Integer); | |
4737 | Set_Etype (N, P_Base_Type); | |
4738 | ||
996ae0b0 RK |
4739 | ----------- |
4740 | -- Model -- | |
4741 | ----------- | |
4742 | ||
4743 | when Attribute_Model => | |
4744 | Check_Floating_Point_Type_1; | |
4745 | Set_Etype (N, P_Base_Type); | |
4746 | Resolve (E1, P_Base_Type); | |
4747 | ||
4748 | ---------------- | |
4749 | -- Model_Emin -- | |
4750 | ---------------- | |
4751 | ||
4752 | when Attribute_Model_Emin => | |
4753 | Check_Floating_Point_Type_0; | |
4754 | Set_Etype (N, Universal_Integer); | |
4755 | ||
4756 | ------------------- | |
4757 | -- Model_Epsilon -- | |
4758 | ------------------- | |
4759 | ||
4760 | when Attribute_Model_Epsilon => | |
4761 | Check_Floating_Point_Type_0; | |
4762 | Set_Etype (N, Universal_Real); | |
4763 | ||
4764 | -------------------- | |
4765 | -- Model_Mantissa -- | |
4766 | -------------------- | |
4767 | ||
4768 | when Attribute_Model_Mantissa => | |
4769 | Check_Floating_Point_Type_0; | |
4770 | Set_Etype (N, Universal_Integer); | |
4771 | ||
4772 | ----------------- | |
4773 | -- Model_Small -- | |
4774 | ----------------- | |
4775 | ||
4776 | when Attribute_Model_Small => | |
4777 | Check_Floating_Point_Type_0; | |
4778 | Set_Etype (N, Universal_Real); | |
4779 | ||
4780 | ------------- | |
4781 | -- Modulus -- | |
4782 | ------------- | |
4783 | ||
4784 | when Attribute_Modulus => | |
4785 | Check_E0; | |
5f3ab6fb | 4786 | Check_Modular_Integer_Type; |
996ae0b0 RK |
4787 | Set_Etype (N, Universal_Integer); |
4788 | ||
4789 | -------------------- | |
4790 | -- Null_Parameter -- | |
4791 | -------------------- | |
4792 | ||
4793 | when Attribute_Null_Parameter => Null_Parameter : declare | |
4794 | Parnt : constant Node_Id := Parent (N); | |
4795 | GParnt : constant Node_Id := Parent (Parnt); | |
4796 | ||
4797 | procedure Bad_Null_Parameter (Msg : String); | |
4798 | -- Used if bad Null parameter attribute node is found. Issues | |
4799 | -- given error message, and also sets the type to Any_Type to | |
4800 | -- avoid blowups later on from dealing with a junk node. | |
4801 | ||
4802 | procedure Must_Be_Imported (Proc_Ent : Entity_Id); | |
4803 | -- Called to check that Proc_Ent is imported subprogram | |
4804 | ||
4805 | ------------------------ | |
4806 | -- Bad_Null_Parameter -- | |
4807 | ------------------------ | |
4808 | ||
4809 | procedure Bad_Null_Parameter (Msg : String) is | |
4810 | begin | |
4811 | Error_Msg_N (Msg, N); | |
4812 | Set_Etype (N, Any_Type); | |
4813 | end Bad_Null_Parameter; | |
4814 | ||
4815 | ---------------------- | |
4816 | -- Must_Be_Imported -- | |
4817 | ---------------------- | |
4818 | ||
4819 | procedure Must_Be_Imported (Proc_Ent : Entity_Id) is | |
b81a5940 | 4820 | Pent : constant Entity_Id := Ultimate_Alias (Proc_Ent); |
996ae0b0 RK |
4821 | |
4822 | begin | |
996ae0b0 RK |
4823 | -- Ignore check if procedure not frozen yet (we will get |
4824 | -- another chance when the default parameter is reanalyzed) | |
4825 | ||
4826 | if not Is_Frozen (Pent) then | |
4827 | return; | |
4828 | ||
4829 | elsif not Is_Imported (Pent) then | |
4830 | Bad_Null_Parameter | |
4831 | ("Null_Parameter can only be used with imported subprogram"); | |
4832 | ||
4833 | else | |
4834 | return; | |
4835 | end if; | |
4836 | end Must_Be_Imported; | |
4837 | ||
4838 | -- Start of processing for Null_Parameter | |
4839 | ||
4840 | begin | |
4841 | Check_Type; | |
4842 | Check_E0; | |
4843 | Set_Etype (N, P_Type); | |
4844 | ||
4845 | -- Case of attribute used as default expression | |
4846 | ||
4847 | if Nkind (Parnt) = N_Parameter_Specification then | |
4848 | Must_Be_Imported (Defining_Entity (GParnt)); | |
4849 | ||
4850 | -- Case of attribute used as actual for subprogram (positional) | |
4851 | ||
d3b00ce3 | 4852 | elsif Nkind (Parnt) in N_Subprogram_Call |
996ae0b0 RK |
4853 | and then Is_Entity_Name (Name (Parnt)) |
4854 | then | |
4855 | Must_Be_Imported (Entity (Name (Parnt))); | |
4856 | ||
4857 | -- Case of attribute used as actual for subprogram (named) | |
4858 | ||
4859 | elsif Nkind (Parnt) = N_Parameter_Association | |
d3b00ce3 | 4860 | and then Nkind (GParnt) in N_Subprogram_Call |
996ae0b0 RK |
4861 | and then Is_Entity_Name (Name (GParnt)) |
4862 | then | |
4863 | Must_Be_Imported (Entity (Name (GParnt))); | |
4864 | ||
4865 | -- Not an allowed case | |
4866 | ||
4867 | else | |
4868 | Bad_Null_Parameter | |
4869 | ("Null_Parameter must be actual or default parameter"); | |
4870 | end if; | |
996ae0b0 RK |
4871 | end Null_Parameter; |
4872 | ||
4873 | ----------------- | |
4874 | -- Object_Size -- | |
4875 | ----------------- | |
4876 | ||
4877 | when Attribute_Object_Size => | |
4878 | Check_E0; | |
4879 | Check_Type; | |
4880 | Check_Not_Incomplete_Type; | |
4881 | Set_Etype (N, Universal_Integer); | |
4882 | ||
e10dab7f JM |
4883 | --------- |
4884 | -- Old -- | |
4885 | --------- | |
4886 | ||
8a0320ad | 4887 | when Attribute_Old => Old : declare |
2c9f8c0a AC |
4888 | procedure Check_References_In_Prefix (Subp_Id : Entity_Id); |
4889 | -- Inspect the contents of the prefix and detect illegal uses of a | |
4890 | -- nested 'Old, attribute 'Result or a use of an entity declared in | |
4891 | -- the related postcondition expression. Subp_Id is the subprogram to | |
4892 | -- which the related postcondition applies. | |
4893 | ||
2c9f8c0a AC |
4894 | -------------------------------- |
4895 | -- Check_References_In_Prefix -- | |
4896 | -------------------------------- | |
4897 | ||
4898 | procedure Check_References_In_Prefix (Subp_Id : Entity_Id) is | |
4899 | function Check_Reference (Nod : Node_Id) return Traverse_Result; | |
4900 | -- Detect attribute 'Old, attribute 'Result of a use of an entity | |
4901 | -- and perform the appropriate semantic check. | |
4902 | ||
4903 | --------------------- | |
4904 | -- Check_Reference -- | |
4905 | --------------------- | |
4906 | ||
4907 | function Check_Reference (Nod : Node_Id) return Traverse_Result is | |
4908 | begin | |
4909 | -- Attributes 'Old and 'Result cannot appear in the prefix of | |
4910 | -- another attribute 'Old. | |
4911 | ||
4912 | if Nkind (Nod) = N_Attribute_Reference | |
4913 | and then Nam_In (Attribute_Name (Nod), Name_Old, | |
4914 | Name_Result) | |
4915 | then | |
4916 | Error_Msg_Name_1 := Attribute_Name (Nod); | |
4917 | Error_Msg_Name_2 := Name_Old; | |
4918 | Error_Msg_N | |
4919 | ("attribute % cannot appear in the prefix of attribute %", | |
4920 | Nod); | |
4921 | return Abandon; | |
4922 | ||
4923 | -- Entities mentioned within the prefix of attribute 'Old must | |
4924 | -- be global to the related postcondition. If this is not the | |
e0f63680 | 4925 | -- case, then the scope of the local entity is nested within |
2c9f8c0a AC |
4926 | -- that of the subprogram. |
4927 | ||
b6a56408 | 4928 | elsif Is_Entity_Name (Nod) |
2c9f8c0a AC |
4929 | and then Present (Entity (Nod)) |
4930 | and then Scope_Within (Scope (Entity (Nod)), Subp_Id) | |
4931 | then | |
4932 | Error_Attr | |
4933 | ("prefix of attribute % cannot reference local entities", | |
4934 | Nod); | |
4935 | return Abandon; | |
b6a56408 AC |
4936 | |
4937 | -- Otherwise keep inspecting the prefix | |
4938 | ||
2c9f8c0a AC |
4939 | else |
4940 | return OK; | |
4941 | end if; | |
4942 | end Check_Reference; | |
4943 | ||
4944 | procedure Check_References is new Traverse_Proc (Check_Reference); | |
4945 | ||
4946 | -- Start of processing for Check_References_In_Prefix | |
4947 | ||
4948 | begin | |
4949 | Check_References (P); | |
4950 | end Check_References_In_Prefix; | |
4951 | ||
2c9f8c0a AC |
4952 | -- Local variables |
4953 | ||
b6a56408 AC |
4954 | Legal : Boolean; |
4955 | Pref_Id : Entity_Id; | |
4956 | Pref_Typ : Entity_Id; | |
4957 | Spec_Id : Entity_Id; | |
8a0320ad | 4958 | |
2c9f8c0a AC |
4959 | -- Start of processing for Old |
4960 | ||
8a0320ad | 4961 | begin |
b6a56408 AC |
4962 | -- The attribute reference is a primary. If any expressions follow, |
4963 | -- then the attribute reference is an indexable object. Transform the | |
4964 | -- attribute into an indexed component and analyze it. | |
8a0320ad | 4965 | |
b6a56408 AC |
4966 | if Present (E1) then |
4967 | Rewrite (N, | |
4968 | Make_Indexed_Component (Loc, | |
4969 | Prefix => | |
4970 | Make_Attribute_Reference (Loc, | |
4971 | Prefix => Relocate_Node (P), | |
4972 | Attribute_Name => Name_Old), | |
4973 | Expressions => Expressions (N))); | |
4974 | Analyze (N); | |
4975 | return; | |
4976 | end if; | |
26df19ce | 4977 | |
b6a56408 | 4978 | Analyze_Attribute_Old_Result (Legal, Spec_Id); |
48b0da2d | 4979 | |
b6a56408 AC |
4980 | -- The aspect or pragma where attribute 'Old resides should be |
4981 | -- associated with a subprogram declaration or a body. If this is not | |
4982 | -- the case, then the aspect or pragma is illegal. Return as analysis | |
4983 | -- cannot be carried out. | |
48b0da2d | 4984 | |
64f5d139 JM |
4985 | -- The exception to this rule is when generating C since in this case |
4986 | -- postconditions are inlined. | |
4987 | ||
4988 | if No (Spec_Id) | |
4989 | and then Modify_Tree_For_C | |
4990 | and then In_Inlined_Body | |
4991 | then | |
4992 | Spec_Id := Entity (P); | |
4993 | ||
4994 | elsif not Legal then | |
48b0da2d | 4995 | return; |
b6a56408 | 4996 | end if; |
48b0da2d | 4997 | |
b6a56408 AC |
4998 | -- The prefix must be preanalyzed as the full analysis will take |
4999 | -- place during expansion. | |
f40f731b | 5000 | |
b6a56408 | 5001 | Preanalyze_And_Resolve (P); |
f40f731b | 5002 | |
b6a56408 | 5003 | -- Ensure that the prefix does not contain attributes 'Old or 'Result |
36eef04a | 5004 | |
b6a56408 | 5005 | Check_References_In_Prefix (Spec_Id); |
8a0320ad | 5006 | |
b6a56408 | 5007 | -- Set the type of the attribute now to prevent cascaded errors |
2eb87017 | 5008 | |
b6a56408 AC |
5009 | Pref_Typ := Etype (P); |
5010 | Set_Etype (N, Pref_Typ); | |
36eef04a | 5011 | |
b6a56408 | 5012 | -- Legality checks |
2eb87017 | 5013 | |
b6a56408 AC |
5014 | if Is_Limited_Type (Pref_Typ) then |
5015 | Error_Attr ("attribute % cannot apply to limited objects", P); | |
5016 | end if; | |
2c9f8c0a | 5017 | |
b6a56408 | 5018 | -- The prefix is a simple name |
8a0320ad | 5019 | |
b6a56408 AC |
5020 | if Is_Entity_Name (P) and then Present (Entity (P)) then |
5021 | Pref_Id := Entity (P); | |
8a0320ad | 5022 | |
b6a56408 AC |
5023 | -- Emit a warning when the prefix is a constant. Note that the use |
5024 | -- of Error_Attr would reset the type of N to Any_Type even though | |
5025 | -- this is a warning. Use Error_Msg_XXX instead. | |
8a0320ad | 5026 | |
b6a56408 AC |
5027 | if Is_Constant_Object (Pref_Id) then |
5028 | Error_Msg_Name_1 := Name_Old; | |
5029 | Error_Msg_N | |
26f36fc9 | 5030 | ("??attribute % applied to constant has no effect", P); |
8a0320ad | 5031 | end if; |
8a0320ad | 5032 | |
b6a56408 | 5033 | -- Otherwise the prefix is not a simple name |
229db351 | 5034 | |
b6a56408 AC |
5035 | else |
5036 | -- Ensure that the prefix of attribute 'Old is an entity when it | |
5037 | -- is potentially unevaluated (6.1.1 (27/3)). | |
d2b4b3da | 5038 | |
2df23f66 AC |
5039 | if Is_Potentially_Unevaluated (N) |
5040 | and then not Statically_Denotes_Object (P) | |
5041 | then | |
b6a56408 | 5042 | Uneval_Old_Msg; |
d2b4b3da | 5043 | |
b6a56408 AC |
5044 | -- Detect a possible infinite recursion when the prefix denotes |
5045 | -- the related function. | |
e10dab7f | 5046 | |
b6a56408 AC |
5047 | -- function Func (...) return ... |
5048 | -- with Post => Func'Old ...; | |
71a555b3 | 5049 | |
08f52d9f AC |
5050 | -- The function may be specified in qualified form X.Y where X is |
5051 | -- a protected object and Y is a protected function. In that case | |
5052 | -- ensure that the qualified form has an entity. | |
5053 | ||
5054 | elsif Nkind (P) = N_Function_Call | |
5055 | and then Nkind (Name (P)) in N_Has_Entity | |
5056 | then | |
b6a56408 | 5057 | Pref_Id := Entity (Name (P)); |
c733429f | 5058 | |
b6a56408 AC |
5059 | if Ekind_In (Spec_Id, E_Function, E_Generic_Function) |
5060 | and then Pref_Id = Spec_Id | |
5061 | then | |
5062 | Error_Msg_Warn := SPARK_Mode /= On; | |
5063 | Error_Msg_N ("!possible infinite recursion<<", P); | |
5064 | Error_Msg_N ("\!??Storage_Error ]<<", P); | |
5065 | end if; | |
5066 | end if; | |
c733429f | 5067 | |
b6a56408 AC |
5068 | -- The prefix of attribute 'Old may refer to a component of a |
5069 | -- formal parameter. In this case its expansion may generate | |
5070 | -- actual subtypes that are referenced in an inner context and | |
5071 | -- that must be elaborated within the subprogram itself. If the | |
5072 | -- prefix includes a function call, it may involve finalization | |
5073 | -- actions that should be inserted when the attribute has been | |
5074 | -- rewritten as a declaration. Create a declaration for the prefix | |
5075 | -- and insert it at the start of the enclosing subprogram. This is | |
5076 | -- an expansion activity that has to be performed now to prevent | |
5077 | -- out-of-order issues. | |
5078 | ||
5079 | -- This expansion is both harmful and not needed in SPARK mode, | |
c9d2e84b | 5080 | -- since the formal verification back end relies on the types of |
b6a56408 AC |
5081 | -- nodes (hence is not robust w.r.t. a change to base type here), |
5082 | -- and does not suffer from the out-of-order issue described | |
5083 | -- above. Thus, this expansion is skipped in SPARK mode. | |
5084 | ||
2cc2e964 AC |
5085 | -- The expansion is not relevant for discrete types, which will |
5086 | -- not generate extra declarations, and where use of the base type | |
5087 | -- may lead to spurious errors if context is a case. | |
3ba1a9eb | 5088 | |
b6a56408 | 5089 | if not GNATprove_Mode then |
3ba1a9eb AC |
5090 | if not Is_Discrete_Type (Pref_Typ) then |
5091 | Pref_Typ := Base_Type (Pref_Typ); | |
5092 | end if; | |
5093 | ||
b6a56408 AC |
5094 | Set_Etype (N, Pref_Typ); |
5095 | Set_Etype (P, Pref_Typ); | |
5096 | ||
5097 | Analyze_Dimension (N); | |
5098 | Expand (N); | |
5099 | end if; | |
d2b4b3da | 5100 | end if; |
8a0320ad | 5101 | end Old; |
d2b4b3da | 5102 | |
2d42e881 ES |
5103 | ---------------------- |
5104 | -- Overlaps_Storage -- | |
5105 | ---------------------- | |
5106 | ||
5107 | when Attribute_Overlaps_Storage => | |
5108 | Check_E1; | |
5109 | ||
5110 | -- Both arguments must be objects of any type | |
5111 | ||
5112 | Analyze_And_Resolve (P); | |
5113 | Analyze_And_Resolve (E1); | |
5114 | Check_Object_Reference (P); | |
5115 | Check_Object_Reference (E1); | |
5116 | Set_Etype (N, Standard_Boolean); | |
5117 | ||
996ae0b0 RK |
5118 | ------------ |
5119 | -- Output -- | |
5120 | ------------ | |
5121 | ||
5122 | when Attribute_Output => | |
5123 | Check_E2; | |
fbf5a39b | 5124 | Check_Stream_Attribute (TSS_Stream_Output); |
996ae0b0 | 5125 | Set_Etype (N, Standard_Void_Type); |
996ae0b0 RK |
5126 | Resolve (N, Standard_Void_Type); |
5127 | ||
5128 | ------------------ | |
5129 | -- Partition_ID -- | |
5130 | ------------------ | |
5131 | ||
d8f43ee6 | 5132 | when Attribute_Partition_ID => |
996ae0b0 RK |
5133 | Check_E0; |
5134 | ||
5135 | if P_Type /= Any_Type then | |
5136 | if not Is_Library_Level_Entity (Entity (P)) then | |
822033eb HK |
5137 | Error_Attr_P |
5138 | ("prefix of % attribute must be library-level entity"); | |
996ae0b0 | 5139 | |
e10dab7f JM |
5140 | -- The defining entity of prefix should not be declared inside a |
5141 | -- Pure unit. RM E.1(8). Is_Pure was set during declaration. | |
996ae0b0 RK |
5142 | |
5143 | elsif Is_Entity_Name (P) | |
5144 | and then Is_Pure (Entity (P)) | |
5145 | then | |
229db351 | 5146 | Error_Attr_P ("prefix of% attribute must not be declared pure"); |
996ae0b0 RK |
5147 | end if; |
5148 | end if; | |
5149 | ||
5150 | Set_Etype (N, Universal_Integer); | |
5151 | ||
5152 | ------------------------- | |
5153 | -- Passed_By_Reference -- | |
5154 | ------------------------- | |
5155 | ||
5156 | when Attribute_Passed_By_Reference => | |
5157 | Check_E0; | |
5158 | Check_Type; | |
5159 | Set_Etype (N, Standard_Boolean); | |
5160 | ||
fbf5a39b AC |
5161 | ------------------ |
5162 | -- Pool_Address -- | |
5163 | ------------------ | |
5164 | ||
5165 | when Attribute_Pool_Address => | |
5166 | Check_E0; | |
5167 | Set_Etype (N, RTE (RE_Address)); | |
5168 | ||
996ae0b0 RK |
5169 | --------- |
5170 | -- Pos -- | |
5171 | --------- | |
5172 | ||
5173 | when Attribute_Pos => | |
5174 | Check_Discrete_Type; | |
5175 | Check_E1; | |
7a489a2b AC |
5176 | |
5177 | if Is_Boolean_Type (P_Type) then | |
5178 | Error_Msg_Name_1 := Aname; | |
5179 | Error_Msg_Name_2 := Chars (P_Type); | |
ce5ba43a | 5180 | Check_SPARK_05_Restriction |
7a489a2b AC |
5181 | ("attribute% is not allowed for type%", P); |
5182 | end if; | |
5183 | ||
996ae0b0 RK |
5184 | Resolve (E1, P_Base_Type); |
5185 | Set_Etype (N, Universal_Integer); | |
5186 | ||
5187 | -------------- | |
5188 | -- Position -- | |
5189 | -------------- | |
5190 | ||
5191 | when Attribute_Position => | |
5192 | Check_Component; | |
5193 | Set_Etype (N, Universal_Integer); | |
5194 | ||
5195 | ---------- | |
5196 | -- Pred -- | |
5197 | ---------- | |
5198 | ||
5199 | when Attribute_Pred => | |
5200 | Check_Scalar_Type; | |
5201 | Check_E1; | |
7a489a2b AC |
5202 | |
5203 | if Is_Real_Type (P_Type) or else Is_Boolean_Type (P_Type) then | |
5204 | Error_Msg_Name_1 := Aname; | |
5205 | Error_Msg_Name_2 := Chars (P_Type); | |
ce5ba43a AC |
5206 | Check_SPARK_05_Restriction |
5207 | ("attribute% is not allowed for type%", P); | |
7a489a2b AC |
5208 | end if; |
5209 | ||
996ae0b0 RK |
5210 | Resolve (E1, P_Base_Type); |
5211 | Set_Etype (N, P_Base_Type); | |
5212 | ||
9ab5d86b RD |
5213 | -- Since Pred works on the base type, we normally do no check for the |
5214 | -- floating-point case, since the base type is unconstrained. But we | |
5215 | -- make an exception in Check_Float_Overflow mode. | |
996ae0b0 | 5216 | |
6cade1b0 | 5217 | if Is_Floating_Point_Type (P_Type) then |
d26d790d AC |
5218 | if not Range_Checks_Suppressed (P_Base_Type) then |
5219 | Set_Do_Range_Check (E1); | |
0083dd66 | 5220 | end if; |
996ae0b0 RK |
5221 | |
5222 | -- If not modular type, test for overflow check required | |
5223 | ||
5224 | else | |
5225 | if not Is_Modular_Integer_Type (P_Type) | |
5226 | and then not Range_Checks_Suppressed (P_Base_Type) | |
5227 | then | |
5228 | Enable_Range_Check (E1); | |
5229 | end if; | |
5230 | end if; | |
5231 | ||
468c6c8a ES |
5232 | -------------- |
5233 | -- Priority -- | |
5234 | -------------- | |
5235 | ||
5236 | -- Ada 2005 (AI-327): Dynamic ceiling priorities | |
5237 | ||
5238 | when Attribute_Priority => | |
0791fbe9 | 5239 | if Ada_Version < Ada_2005 then |
468c6c8a ES |
5240 | Error_Attr ("% attribute is allowed only in Ada 2005 mode", P); |
5241 | end if; | |
5242 | ||
5243 | Check_E0; | |
5244 | ||
60aa5228 AC |
5245 | Check_Restriction (No_Dynamic_Priorities, N); |
5246 | ||
468c6c8a ES |
5247 | -- The prefix must be a protected object (AARM D.5.2 (2/2)) |
5248 | ||
5249 | Analyze (P); | |
5250 | ||
5251 | if Is_Protected_Type (Etype (P)) | |
5252 | or else (Is_Access_Type (Etype (P)) | |
5253 | and then Is_Protected_Type (Designated_Type (Etype (P)))) | |
5254 | then | |
5255 | Resolve (P, Etype (P)); | |
5256 | else | |
822033eb | 5257 | Error_Attr_P ("prefix of % attribute must be a protected object"); |
468c6c8a ES |
5258 | end if; |
5259 | ||
5260 | Set_Etype (N, Standard_Integer); | |
5261 | ||
5262 | -- Must be called from within a protected procedure or entry of the | |
5263 | -- protected object. | |
5264 | ||
5265 | declare | |
5266 | S : Entity_Id; | |
5267 | ||
5268 | begin | |
5269 | S := Current_Scope; | |
5270 | while S /= Etype (P) | |
5271 | and then S /= Standard_Standard | |
5272 | loop | |
5273 | S := Scope (S); | |
5274 | end loop; | |
5275 | ||
5276 | if S = Standard_Standard then | |
5277 | Error_Attr ("the attribute % is only allowed inside protected " | |
5278 | & "operations", P); | |
5279 | end if; | |
5280 | end; | |
5281 | ||
5282 | Validate_Non_Static_Attribute_Function_Call; | |
5283 | ||
996ae0b0 RK |
5284 | ----------- |
5285 | -- Range -- | |
5286 | ----------- | |
5287 | ||
5288 | when Attribute_Range => | |
5289 | Check_Array_Or_Scalar_Type; | |
26df19ce | 5290 | Bad_Attribute_For_Predicate; |
996ae0b0 | 5291 | |
0ab80019 | 5292 | if Ada_Version = Ada_83 |
996ae0b0 RK |
5293 | and then Is_Scalar_Type (P_Type) |
5294 | and then Comes_From_Source (N) | |
5295 | then | |
5296 | Error_Attr | |
5297 | ("(Ada 83) % attribute not allowed for scalar type", P); | |
5298 | end if; | |
5299 | ||
21d27997 RD |
5300 | ------------ |
5301 | -- Result -- | |
5302 | ------------ | |
5303 | ||
5304 | when Attribute_Result => Result : declare | |
7c76aa3f HK |
5305 | function Denote_Same_Function |
5306 | (Pref_Id : Entity_Id; | |
5307 | Spec_Id : Entity_Id) return Boolean; | |
5308 | -- Determine whether the entity of the prefix Pref_Id denotes the | |
5309 | -- same entity as that of the related subprogram Spec_Id. | |
5310 | ||
7c76aa3f HK |
5311 | -------------------------- |
5312 | -- Denote_Same_Function -- | |
5313 | -------------------------- | |
5314 | ||
5315 | function Denote_Same_Function | |
5316 | (Pref_Id : Entity_Id; | |
5317 | Spec_Id : Entity_Id) return Boolean | |
5318 | is | |
4afcf3a5 AC |
5319 | Over_Id : constant Entity_Id := Overridden_Operation (Spec_Id); |
5320 | Subp_Spec : constant Node_Id := Parent (Spec_Id); | |
7c76aa3f HK |
5321 | |
5322 | begin | |
5323 | -- The prefix denotes the related subprogram | |
5324 | ||
5325 | if Pref_Id = Spec_Id then | |
5326 | return True; | |
5327 | ||
5328 | -- Account for a special case when attribute 'Result appears in | |
5329 | -- the postcondition of a generic function. | |
5330 | ||
5331 | -- generic | |
5332 | -- function Gen_Func return ... | |
5333 | -- with Post => Gen_Func'Result ...; | |
5334 | ||
5335 | -- When the generic function is instantiated, the Chars field of | |
5336 | -- the instantiated prefix still denotes the name of the generic | |
5337 | -- function. Note that any preemptive transformation is impossible | |
5338 | -- without a proper analysis. The structure of the wrapper package | |
5339 | -- is as follows: | |
5340 | ||
5341 | -- package Anon_Gen_Pack is | |
5342 | -- <subtypes and renamings> | |
5343 | -- function Subp_Decl return ...; -- (!) | |
5344 | -- pragma Postcondition (Gen_Func'Result ...); -- (!) | |
5345 | -- function Gen_Func ... renames Subp_Decl; | |
5346 | -- end Anon_Gen_Pack; | |
5347 | ||
5348 | elsif Nkind (Subp_Spec) = N_Function_Specification | |
5349 | and then Present (Generic_Parent (Subp_Spec)) | |
caf07df9 | 5350 | and then Ekind_In (Pref_Id, E_Generic_Function, E_Function) |
7c76aa3f | 5351 | then |
caf07df9 AC |
5352 | if Generic_Parent (Subp_Spec) = Pref_Id then |
5353 | return True; | |
5354 | ||
5355 | elsif Present (Alias (Pref_Id)) | |
5356 | and then Alias (Pref_Id) = Spec_Id | |
5357 | then | |
5358 | return True; | |
5359 | end if; | |
4afcf3a5 AC |
5360 | |
5361 | -- Account for a special case where a primitive of a tagged type | |
5362 | -- inherits a class-wide postcondition from a parent type. In this | |
5363 | -- case the prefix of attribute 'Result denotes the overriding | |
5364 | -- primitive. | |
5365 | ||
5366 | elsif Present (Over_Id) and then Pref_Id = Over_Id then | |
5367 | return True; | |
caf07df9 | 5368 | end if; |
7c76aa3f HK |
5369 | |
5370 | -- Otherwise the prefix does not denote the related subprogram | |
5371 | ||
caf07df9 | 5372 | return False; |
7c76aa3f HK |
5373 | end Denote_Same_Function; |
5374 | ||
c9d70ab1 | 5375 | -- Local variables |
f40f731b | 5376 | |
fc3a3580 | 5377 | In_Inlined_C_Postcondition : constant Boolean := |
f31dcd99 HK |
5378 | Modify_Tree_For_C |
5379 | and then In_Inlined_Body; | |
fc3a3580 | 5380 | |
b6a56408 AC |
5381 | Legal : Boolean; |
5382 | Pref_Id : Entity_Id; | |
5383 | Spec_Id : Entity_Id; | |
36eef04a | 5384 | |
c9d70ab1 | 5385 | -- Start of processing for Result |
dac3bede | 5386 | |
c9d70ab1 AC |
5387 | begin |
5388 | -- The attribute reference is a primary. If any expressions follow, | |
5389 | -- then the attribute reference is an indexable object. Transform the | |
5390 | -- attribute into an indexed component and analyze it. | |
dac3bede | 5391 | |
c9d70ab1 AC |
5392 | if Present (E1) then |
5393 | Rewrite (N, | |
5394 | Make_Indexed_Component (Loc, | |
5395 | Prefix => | |
5396 | Make_Attribute_Reference (Loc, | |
5397 | Prefix => Relocate_Node (P), | |
5398 | Attribute_Name => Name_Result), | |
5399 | Expressions => Expressions (N))); | |
5400 | Analyze (N); | |
5401 | return; | |
5402 | end if; | |
36eef04a | 5403 | |
b6a56408 | 5404 | Analyze_Attribute_Old_Result (Legal, Spec_Id); |
21d27997 | 5405 | |
b6a56408 AC |
5406 | -- The aspect or pragma where attribute 'Result resides should be |
5407 | -- associated with a subprogram declaration or a body. If this is not | |
5408 | -- the case, then the aspect or pragma is illegal. Return as analysis | |
5409 | -- cannot be carried out. | |
7c76aa3f | 5410 | |
64f5d139 JM |
5411 | -- The exception to this rule is when generating C since in this case |
5412 | -- postconditions are inlined. | |
5413 | ||
fc3a3580 | 5414 | if No (Spec_Id) and then In_Inlined_C_Postcondition then |
64f5d139 JM |
5415 | Spec_Id := Entity (P); |
5416 | ||
5417 | elsif not Legal then | |
c1711990 | 5418 | Error_Attr ("prefix of % attribute must be a function", P); |
7c76aa3f HK |
5419 | return; |
5420 | end if; | |
a905304c | 5421 | |
7c76aa3f HK |
5422 | -- Attribute 'Result is part of a _Postconditions procedure. There is |
5423 | -- no need to perform the semantic checks below as they were already | |
5424 | -- verified when the attribute was analyzed in its original context. | |
5425 | -- Instead, rewrite the attribute as a reference to formal parameter | |
5426 | -- _Result of the _Postconditions procedure. | |
e7f23f06 | 5427 | |
fc3a3580 AC |
5428 | if Chars (Spec_Id) = Name_uPostconditions |
5429 | or else | |
5430 | (In_Inlined_C_Postcondition | |
f31dcd99 | 5431 | and then Nkind (Parent (Spec_Id)) = N_Block_Statement) |
fc3a3580 | 5432 | then |
7c76aa3f | 5433 | Rewrite (N, Make_Identifier (Loc, Name_uResult)); |
a905304c | 5434 | |
7c76aa3f HK |
5435 | -- The type of formal parameter _Result is that of the function |
5436 | -- encapsulating the _Postconditions procedure. Resolution must | |
5437 | -- be carried out against the function return type. | |
e7f23f06 | 5438 | |
7c76aa3f | 5439 | Analyze_And_Resolve (N, Etype (Scope (Spec_Id))); |
e7f23f06 | 5440 | |
7c76aa3f HK |
5441 | -- Otherwise attribute 'Result appears in its original context and |
5442 | -- all semantic checks should be carried out. | |
21d27997 | 5443 | |
7c76aa3f HK |
5444 | else |
5445 | -- Verify the legality of the prefix. It must denotes the entity | |
5446 | -- of the related [generic] function. | |
c9d70ab1 AC |
5447 | |
5448 | if Is_Entity_Name (P) then | |
5449 | Pref_Id := Entity (P); | |
5450 | ||
3386e3ae AC |
5451 | if Ekind_In (Pref_Id, E_Function, E_Generic_Function) |
5452 | and then Ekind (Spec_Id) = Ekind (Pref_Id) | |
5453 | then | |
7c76aa3f | 5454 | if Denote_Same_Function (Pref_Id, Spec_Id) then |
caf07df9 AC |
5455 | |
5456 | -- Correct the prefix of the attribute when the context | |
5457 | -- is a generic function. | |
5458 | ||
5459 | if Pref_Id /= Spec_Id then | |
5460 | Rewrite (P, New_Occurrence_Of (Spec_Id, Loc)); | |
5461 | Analyze (P); | |
5462 | end if; | |
5463 | ||
7c76aa3f | 5464 | Set_Etype (N, Etype (Spec_Id)); |
8d9509fd | 5465 | |
7c76aa3f | 5466 | -- Otherwise the prefix denotes some unrelated function |
c9d70ab1 | 5467 | |
7c76aa3f HK |
5468 | else |
5469 | Error_Msg_Name_2 := Chars (Spec_Id); | |
5470 | Error_Attr | |
b6a56408 | 5471 | ("incorrect prefix for attribute %, expected %", P); |
c9d70ab1 AC |
5472 | end if; |
5473 | ||
7c76aa3f HK |
5474 | -- Otherwise the prefix denotes some other form of subprogram |
5475 | -- entity. | |
21d27997 | 5476 | |
8d9509fd | 5477 | else |
e7f23f06 | 5478 | Error_Attr |
b6a56408 | 5479 | ("attribute % can only appear in postcondition of " |
c9d70ab1 | 5480 | & "function", P); |
8d9509fd | 5481 | end if; |
21d27997 | 5482 | |
c9d70ab1 AC |
5483 | -- Otherwise the prefix is illegal |
5484 | ||
5485 | else | |
5486 | Error_Msg_Name_2 := Chars (Spec_Id); | |
b6a56408 | 5487 | Error_Attr ("incorrect prefix for attribute %, expected %", P); |
c9d70ab1 | 5488 | end if; |
21d27997 RD |
5489 | end if; |
5490 | end Result; | |
5491 | ||
996ae0b0 RK |
5492 | ------------------ |
5493 | -- Range_Length -- | |
5494 | ------------------ | |
5495 | ||
5496 | when Attribute_Range_Length => | |
e10dab7f | 5497 | Check_E0; |
996ae0b0 RK |
5498 | Check_Discrete_Type; |
5499 | Set_Etype (N, Universal_Integer); | |
5500 | ||
3c08de34 ES |
5501 | ------------ |
5502 | -- Reduce -- | |
5503 | ------------ | |
5504 | ||
5505 | when Attribute_Reduce => | |
5506 | Check_E2; | |
5507 | ||
5508 | declare | |
5509 | Stream : constant Node_Id := Prefix (N); | |
5510 | Typ : Entity_Id; | |
5511 | begin | |
5512 | if Nkind (Stream) /= N_Aggregate then | |
5513 | -- Prefix is a name, as for other attributes. | |
5514 | ||
5515 | -- If the object is a function we asume that it is not | |
5516 | -- overloaded. AI12-242 does not suggest an name resulution | |
5517 | -- rule for that case, but can suppose that the expected | |
5518 | -- type of the reduction is the expected type of the | |
5519 | -- component of the prefix. | |
5520 | ||
5521 | Analyze_And_Resolve (Stream); | |
5522 | Typ := Etype (Stream); | |
5523 | ||
5524 | -- Verify that prefix can be iterated upon. | |
5525 | ||
5526 | if Is_Array_Type (Typ) | |
5527 | or else Present (Find_Aspect (Typ, Aspect_Default_Iterator)) | |
5528 | or else Present (Find_Aspect (Typ, Aspect_Iterable)) | |
5529 | then | |
5530 | null; | |
5531 | else | |
5532 | Error_Msg_NE | |
5533 | ("cannot apply reduce to object of type$", N, Typ); | |
5534 | end if; | |
5535 | ||
5536 | elsif Present (Expressions (Stream)) | |
5537 | or else No (Component_Associations (Stream)) | |
5538 | or else Nkind (First (Component_Associations (Stream))) /= | |
5539 | N_Iterated_Component_Association | |
5540 | then | |
5541 | Error_Msg_N | |
5542 | ("Prefix of reduce must be an iterated component", N); | |
5543 | end if; | |
5544 | ||
5545 | Analyze (E1); | |
5546 | Analyze (E2); | |
5547 | Set_Etype (N, Etype (E2)); | |
5548 | end; | |
5549 | ||
996ae0b0 RK |
5550 | ---------- |
5551 | -- Read -- | |
5552 | ---------- | |
5553 | ||
5554 | when Attribute_Read => | |
5555 | Check_E2; | |
fbf5a39b | 5556 | Check_Stream_Attribute (TSS_Stream_Read); |
996ae0b0 RK |
5557 | Set_Etype (N, Standard_Void_Type); |
5558 | Resolve (N, Standard_Void_Type); | |
21d27997 | 5559 | Note_Possible_Modification (E2, Sure => True); |
996ae0b0 | 5560 | |
1b0b0f18 AC |
5561 | --------- |
5562 | -- Ref -- | |
5563 | --------- | |
5564 | ||
5565 | when Attribute_Ref => | |
5566 | Check_E1; | |
5567 | Analyze (P); | |
5568 | ||
5569 | if Nkind (P) /= N_Expanded_Name | |
5570 | or else not Is_RTE (P_Type, RE_Address) | |
5571 | then | |
5572 | Error_Attr_P ("prefix of % attribute must be System.Address"); | |
5573 | end if; | |
5574 | ||
5575 | Analyze_And_Resolve (E1, Any_Integer); | |
5576 | Set_Etype (N, RTE (RE_Address)); | |
5577 | ||
996ae0b0 RK |
5578 | --------------- |
5579 | -- Remainder -- | |
5580 | --------------- | |
5581 | ||
5582 | when Attribute_Remainder => | |
5583 | Check_Floating_Point_Type_2; | |
5584 | Set_Etype (N, P_Base_Type); | |
5585 | Resolve (E1, P_Base_Type); | |
5586 | Resolve (E2, P_Base_Type); | |
5587 | ||
2cbac6c6 AC |
5588 | --------------------- |
5589 | -- Restriction_Set -- | |
5590 | --------------------- | |
5591 | ||
5592 | when Attribute_Restriction_Set => Restriction_Set : declare | |
5593 | R : Restriction_Id; | |
5594 | U : Node_Id; | |
5595 | Unam : Unit_Name_Type; | |
5596 | ||
2cbac6c6 AC |
5597 | begin |
5598 | Check_E1; | |
5599 | Analyze (P); | |
f7ea2603 | 5600 | Check_System_Prefix; |
2cbac6c6 AC |
5601 | |
5602 | -- No_Dependence case | |
5603 | ||
5604 | if Nkind (E1) = N_Parameter_Association then | |
5605 | pragma Assert (Chars (Selector_Name (E1)) = Name_No_Dependence); | |
5606 | U := Explicit_Actual_Parameter (E1); | |
5607 | ||
5608 | if not OK_No_Dependence_Unit_Name (U) then | |
f7ea2603 | 5609 | Set_Boolean_Result (N, False); |
2cbac6c6 AC |
5610 | Error_Attr; |
5611 | end if; | |
5612 | ||
5613 | -- See if there is an entry already in the table. That's the | |
5614 | -- case in which we can return True. | |
5615 | ||
5616 | for J in No_Dependences.First .. No_Dependences.Last loop | |
5617 | if Designate_Same_Unit (U, No_Dependences.Table (J).Unit) | |
5618 | and then No_Dependences.Table (J).Warn = False | |
5619 | then | |
f7ea2603 | 5620 | Set_Boolean_Result (N, True); |
2cbac6c6 AC |
5621 | return; |
5622 | end if; | |
5623 | end loop; | |
5624 | ||
5625 | -- If not in the No_Dependence table, result is False | |
5626 | ||
f7ea2603 | 5627 | Set_Boolean_Result (N, False); |
2cbac6c6 AC |
5628 | |
5629 | -- In this case, we must ensure that the binder will reject any | |
5630 | -- other unit in the partition that sets No_Dependence for this | |
5631 | -- unit. We do that by making an entry in the special table kept | |
5632 | -- for this purpose (if the entry is not there already). | |
5633 | ||
5634 | Unam := Get_Spec_Name (Get_Unit_Name (U)); | |
5635 | ||
5636 | for J in Restriction_Set_Dependences.First .. | |
5637 | Restriction_Set_Dependences.Last | |
5638 | loop | |
5639 | if Restriction_Set_Dependences.Table (J) = Unam then | |
5640 | return; | |
5641 | end if; | |
5642 | end loop; | |
5643 | ||
5644 | Restriction_Set_Dependences.Append (Unam); | |
5645 | ||
5646 | -- Normal restriction case | |
5647 | ||
5648 | else | |
5649 | if Nkind (E1) /= N_Identifier then | |
f7ea2603 | 5650 | Set_Boolean_Result (N, False); |
2cbac6c6 AC |
5651 | Error_Attr ("attribute % requires restriction identifier", E1); |
5652 | ||
5653 | else | |
5654 | R := Get_Restriction_Id (Process_Restriction_Synonyms (E1)); | |
5655 | ||
5656 | if R = Not_A_Restriction_Id then | |
f7ea2603 | 5657 | Set_Boolean_Result (N, False); |
2cbac6c6 AC |
5658 | Error_Msg_Node_1 := E1; |
5659 | Error_Attr ("invalid restriction identifier &", E1); | |
5660 | ||
5661 | elsif R not in Partition_Boolean_Restrictions then | |
f7ea2603 | 5662 | Set_Boolean_Result (N, False); |
2cbac6c6 AC |
5663 | Error_Msg_Node_1 := E1; |
5664 | Error_Attr | |
5665 | ("& is not a boolean partition-wide restriction", E1); | |
5666 | end if; | |
5667 | ||
5668 | if Restriction_Active (R) then | |
f7ea2603 | 5669 | Set_Boolean_Result (N, True); |
2cbac6c6 AC |
5670 | else |
5671 | Check_Restriction (R, N); | |
f7ea2603 | 5672 | Set_Boolean_Result (N, False); |
2cbac6c6 AC |
5673 | end if; |
5674 | end if; | |
5675 | end if; | |
5676 | end Restriction_Set; | |
5677 | ||
996ae0b0 RK |
5678 | ----------- |
5679 | -- Round -- | |
5680 | ----------- | |
5681 | ||
5682 | when Attribute_Round => | |
5683 | Check_E1; | |
5684 | Check_Decimal_Fixed_Point_Type; | |
5685 | Set_Etype (N, P_Base_Type); | |
5686 | ||
29ba9f52 RD |
5687 | -- Because the context is universal_real (3.5.10(12)) it is a |
5688 | -- legal context for a universal fixed expression. This is the | |
5689 | -- only attribute whose functional description involves U_R. | |
996ae0b0 RK |
5690 | |
5691 | if Etype (E1) = Universal_Fixed then | |
5692 | declare | |
5693 | Conv : constant Node_Id := Make_Type_Conversion (Loc, | |
5694 | Subtype_Mark => New_Occurrence_Of (Universal_Real, Loc), | |
5695 | Expression => Relocate_Node (E1)); | |
5696 | ||
5697 | begin | |
5698 | Rewrite (E1, Conv); | |
5699 | Analyze (E1); | |
5700 | end; | |
5701 | end if; | |
5702 | ||
5703 | Resolve (E1, Any_Real); | |
5704 | ||
5705 | -------------- | |
5706 | -- Rounding -- | |
5707 | -------------- | |
5708 | ||
5709 | when Attribute_Rounding => | |
5710 | Check_Floating_Point_Type_1; | |
5711 | Set_Etype (N, P_Base_Type); | |
5712 | Resolve (E1, P_Base_Type); | |
5713 | ||
5714 | --------------- | |
5715 | -- Safe_Emax -- | |
5716 | --------------- | |
5717 | ||
5718 | when Attribute_Safe_Emax => | |
5719 | Check_Floating_Point_Type_0; | |
5720 | Set_Etype (N, Universal_Integer); | |
5721 | ||
5722 | ---------------- | |
5723 | -- Safe_First -- | |
5724 | ---------------- | |
5725 | ||
5726 | when Attribute_Safe_First => | |
5727 | Check_Floating_Point_Type_0; | |
5728 | Set_Etype (N, Universal_Real); | |
5729 | ||
5730 | ---------------- | |
5731 | -- Safe_Large -- | |
5732 | ---------------- | |
5733 | ||
5734 | when Attribute_Safe_Large => | |
5735 | Check_E0; | |
5736 | Check_Real_Type; | |
5737 | Set_Etype (N, Universal_Real); | |
5738 | ||
5739 | --------------- | |
5740 | -- Safe_Last -- | |
5741 | --------------- | |
5742 | ||
5743 | when Attribute_Safe_Last => | |
5744 | Check_Floating_Point_Type_0; | |
5745 | Set_Etype (N, Universal_Real); | |
5746 | ||
5747 | ---------------- | |
5748 | -- Safe_Small -- | |
5749 | ---------------- | |
5750 | ||
5751 | when Attribute_Safe_Small => | |
5752 | Check_E0; | |
5753 | Check_Real_Type; | |
5754 | Set_Etype (N, Universal_Real); | |
5755 | ||
f91510fc AC |
5756 | -------------------------- |
5757 | -- Scalar_Storage_Order -- | |
5758 | -------------------------- | |
5759 | ||
d8f43ee6 | 5760 | when Attribute_Scalar_Storage_Order => Scalar_Storage_Order : declare |
02bb0765 | 5761 | Ent : Entity_Id := Empty; |
15918371 | 5762 | |
f91510fc AC |
5763 | begin |
5764 | Check_E0; | |
5765 | Check_Type; | |
5766 | ||
83553466 AC |
5767 | if not (Is_Record_Type (P_Type) or else Is_Array_Type (P_Type)) then |
5768 | ||
8b55e70d ES |
5769 | -- The attribute applies to generic private types (in which case |
5770 | -- the legality rule is applied in the instance) as well as to | |
5771 | -- composite types. For noncomposite types it always returns the | |
5772 | -- default bit order for the target. | |
5773 | -- Allowing formal private types was originally introduced in | |
5774 | -- GNAT_Mode only, to compile instances of Sequential_IO, but | |
5775 | -- users find it more generally useful in generic units. | |
5776 | ||
5777 | if not (Is_Generic_Type (P_Type) and then Is_Private_Type (P_Type)) | |
02bb0765 | 5778 | and then not In_Instance |
83553466 AC |
5779 | then |
5780 | Error_Attr_P | |
5781 | ("prefix of % attribute must be record or array type"); | |
5782 | ||
5783 | elsif not Is_Generic_Type (P_Type) then | |
5784 | if Bytes_Big_Endian then | |
5785 | Ent := RTE (RE_High_Order_First); | |
5786 | else | |
5787 | Ent := RTE (RE_Low_Order_First); | |
5788 | end if; | |
5789 | end if; | |
5790 | ||
5791 | elsif Bytes_Big_Endian xor Reverse_Storage_Order (P_Type) then | |
5792 | Ent := RTE (RE_High_Order_First); | |
f91510fc | 5793 | |
f91510fc | 5794 | else |
83553466 AC |
5795 | Ent := RTE (RE_Low_Order_First); |
5796 | end if; | |
5797 | ||
5798 | if Present (Ent) then | |
5799 | Rewrite (N, New_Occurrence_Of (Ent, Loc)); | |
f91510fc AC |
5800 | end if; |
5801 | ||
5802 | Set_Etype (N, RTE (RE_Bit_Order)); | |
5803 | Resolve (N); | |
5804 | ||
5805 | -- Reset incorrect indication of staticness | |
5806 | ||
5807 | Set_Is_Static_Expression (N, False); | |
5808 | end Scalar_Storage_Order; | |
5809 | ||
996ae0b0 RK |
5810 | ----------- |
5811 | -- Scale -- | |
5812 | ----------- | |
5813 | ||
5814 | when Attribute_Scale => | |
5815 | Check_E0; | |
5816 | Check_Decimal_Fixed_Point_Type; | |
5817 | Set_Etype (N, Universal_Integer); | |
5818 | ||
5819 | ------------- | |
5820 | -- Scaling -- | |
5821 | ------------- | |
5822 | ||
5823 | when Attribute_Scaling => | |
5824 | Check_Floating_Point_Type_2; | |
5825 | Set_Etype (N, P_Base_Type); | |
5826 | Resolve (E1, P_Base_Type); | |
5827 | ||
5828 | ------------------ | |
5829 | -- Signed_Zeros -- | |
5830 | ------------------ | |
5831 | ||
5832 | when Attribute_Signed_Zeros => | |
5833 | Check_Floating_Point_Type_0; | |
5834 | Set_Etype (N, Standard_Boolean); | |
5835 | ||
5836 | ---------- | |
5837 | -- Size -- | |
5838 | ---------- | |
5839 | ||
d8f43ee6 HK |
5840 | when Attribute_Size |
5841 | | Attribute_VADS_Size | |
5842 | => | |
996ae0b0 RK |
5843 | Check_E0; |
5844 | ||
5d09245e AC |
5845 | -- If prefix is parameterless function call, rewrite and resolve |
5846 | -- as such. | |
5847 | ||
5848 | if Is_Entity_Name (P) | |
5849 | and then Ekind (Entity (P)) = E_Function | |
996ae0b0 | 5850 | then |
5d09245e AC |
5851 | Resolve (P); |
5852 | ||
5853 | -- Similar processing for a protected function call | |
5854 | ||
5855 | elsif Nkind (P) = N_Selected_Component | |
5856 | and then Ekind (Entity (Selector_Name (P))) = E_Function | |
5857 | then | |
5858 | Resolve (P); | |
5859 | end if; | |
5860 | ||
5861 | if Is_Object_Reference (P) then | |
996ae0b0 RK |
5862 | Check_Object_Reference (P); |
5863 | ||
0873bafc | 5864 | elsif Is_Entity_Name (P) |
c4e5e10f TQ |
5865 | and then (Is_Type (Entity (P)) |
5866 | or else Ekind (Entity (P)) = E_Enumeration_Literal) | |
996ae0b0 | 5867 | then |
0873bafc GB |
5868 | null; |
5869 | ||
5870 | elsif Nkind (P) = N_Type_Conversion | |
5871 | and then not Comes_From_Source (P) | |
5872 | then | |
5873 | null; | |
5874 | ||
5b75bf57 AC |
5875 | -- Some other compilers allow dubious use of X'???'Size |
5876 | ||
303fbb20 AC |
5877 | elsif Relaxed_RM_Semantics |
5878 | and then Nkind (P) = N_Attribute_Reference | |
5879 | then | |
5880 | null; | |
5881 | ||
0873bafc | 5882 | else |
822033eb | 5883 | Error_Attr_P ("invalid prefix for % attribute"); |
996ae0b0 RK |
5884 | end if; |
5885 | ||
5886 | Check_Not_Incomplete_Type; | |
21d27997 | 5887 | Check_Not_CPP_Type; |
996ae0b0 | 5888 | Set_Etype (N, Universal_Integer); |
a946a5c3 JM |
5889 | |
5890 | -- If we are processing pragmas Compile_Time_Warning and Compile_ | |
c9d2e84b | 5891 | -- Time_Errors after the back end has been called and this occurrence |
a946a5c3 JM |
5892 | -- of 'Size is known at compile time then it is safe to perform this |
5893 | -- evaluation. Needed to perform the static evaluation of the full | |
4a187263 BD |
5894 | -- boolean expression of these pragmas. Note that Known_RM_Size is |
5895 | -- sometimes True when Size_Known_At_Compile_Time is False, when the | |
5896 | -- back end has computed it. | |
a946a5c3 JM |
5897 | |
5898 | if In_Compile_Time_Warning_Or_Error | |
5899 | and then Is_Entity_Name (P) | |
5900 | and then (Is_Type (Entity (P)) | |
5901 | or else Ekind (Entity (P)) = E_Enumeration_Literal) | |
4a187263 BD |
5902 | and then (Known_RM_Size (Entity (P)) |
5903 | or else Size_Known_At_Compile_Time (Entity (P))) | |
a946a5c3 | 5904 | then |
b91cdf75 JM |
5905 | declare |
5906 | Siz : Uint; | |
5907 | ||
5908 | begin | |
5909 | if Known_Static_RM_Size (Entity (P)) then | |
5910 | Siz := RM_Size (Entity (P)); | |
5911 | else | |
5912 | Siz := Esize (Entity (P)); | |
5913 | end if; | |
5914 | ||
5915 | Rewrite (N, Make_Integer_Literal (Sloc (N), Siz)); | |
5916 | Analyze (N); | |
5917 | end; | |
a946a5c3 | 5918 | end if; |
996ae0b0 RK |
5919 | |
5920 | ----------- | |
5921 | -- Small -- | |
5922 | ----------- | |
5923 | ||
5924 | when Attribute_Small => | |
5925 | Check_E0; | |
5926 | Check_Real_Type; | |
5927 | Set_Etype (N, Universal_Real); | |
5928 | ||
5929 | ------------------ | |
5930 | -- Storage_Pool -- | |
5931 | ------------------ | |
5932 | ||
d8f43ee6 HK |
5933 | when Attribute_Storage_Pool |
5934 | | Attribute_Simple_Storage_Pool | |
5935 | => | |
e10dab7f | 5936 | Check_E0; |
996ae0b0 | 5937 | |
e10dab7f | 5938 | if Is_Access_Type (P_Type) then |
468c6c8a | 5939 | if Ekind (P_Type) = E_Access_Subprogram_Type then |
822033eb HK |
5940 | Error_Attr_P |
5941 | ("cannot use % attribute for access-to-subprogram type"); | |
468c6c8a ES |
5942 | end if; |
5943 | ||
996ae0b0 RK |
5944 | -- Set appropriate entity |
5945 | ||
5946 | if Present (Associated_Storage_Pool (Root_Type (P_Type))) then | |
5947 | Set_Entity (N, Associated_Storage_Pool (Root_Type (P_Type))); | |
5948 | else | |
5949 | Set_Entity (N, RTE (RE_Global_Pool_Object)); | |
5950 | end if; | |
5951 | ||
a8551b5f AC |
5952 | if Attr_Id = Attribute_Storage_Pool then |
5953 | if Present (Get_Rep_Pragma (Etype (Entity (N)), | |
f6205414 | 5954 | Name_Simple_Storage_Pool_Type)) |
a8551b5f AC |
5955 | then |
5956 | Error_Msg_Name_1 := Aname; | |
43417b90 | 5957 | Error_Msg_Warn := SPARK_Mode /= On; |
d8f43ee6 HK |
5958 | Error_Msg_N |
5959 | ("cannot use % attribute for type with simple storage " | |
5960 | & "pool<<", N); | |
4a28b181 | 5961 | Error_Msg_N ("\Program_Error [<<", N); |
a8551b5f AC |
5962 | |
5963 | Rewrite | |
5964 | (N, Make_Raise_Program_Error | |
5965 | (Sloc (N), Reason => PE_Explicit_Raise)); | |
5966 | end if; | |
5967 | ||
5968 | Set_Etype (N, Class_Wide_Type (RTE (RE_Root_Storage_Pool))); | |
5969 | ||
5970 | -- In the Simple_Storage_Pool case, verify that the pool entity is | |
5971 | -- actually of a simple storage pool type, and set the attribute's | |
5972 | -- type to the pool object's type. | |
5973 | ||
5974 | else | |
5975 | if not Present (Get_Rep_Pragma (Etype (Entity (N)), | |
f6205414 | 5976 | Name_Simple_Storage_Pool_Type)) |
a8551b5f AC |
5977 | then |
5978 | Error_Attr_P | |
5979 | ("cannot use % attribute for type without simple " & | |
5980 | "storage pool"); | |
5981 | end if; | |
5982 | ||
5983 | Set_Etype (N, Etype (Entity (N))); | |
5984 | end if; | |
996ae0b0 RK |
5985 | |
5986 | -- Validate_Remote_Access_To_Class_Wide_Type for attribute | |
5987 | -- Storage_Pool since this attribute is not defined for such | |
5988 | -- types (RM E.2.3(22)). | |
5989 | ||
5990 | Validate_Remote_Access_To_Class_Wide_Type (N); | |
5991 | ||
5992 | else | |
822033eb | 5993 | Error_Attr_P ("prefix of % attribute must be access type"); |
996ae0b0 RK |
5994 | end if; |
5995 | ||
5996 | ------------------ | |
5997 | -- Storage_Size -- | |
5998 | ------------------ | |
5999 | ||
d8f43ee6 | 6000 | when Attribute_Storage_Size => |
e10dab7f JM |
6001 | Check_E0; |
6002 | ||
996ae0b0 | 6003 | if Is_Task_Type (P_Type) then |
996ae0b0 RK |
6004 | Set_Etype (N, Universal_Integer); |
6005 | ||
b5c739f9 RD |
6006 | -- Use with tasks is an obsolescent feature |
6007 | ||
6008 | Check_Restriction (No_Obsolescent_Features, P); | |
6009 | ||
996ae0b0 | 6010 | elsif Is_Access_Type (P_Type) then |
468c6c8a | 6011 | if Ekind (P_Type) = E_Access_Subprogram_Type then |
822033eb HK |
6012 | Error_Attr_P |
6013 | ("cannot use % attribute for access-to-subprogram type"); | |
468c6c8a ES |
6014 | end if; |
6015 | ||
996ae0b0 RK |
6016 | if Is_Entity_Name (P) |
6017 | and then Is_Type (Entity (P)) | |
6018 | then | |
996ae0b0 RK |
6019 | Check_Type; |
6020 | Set_Etype (N, Universal_Integer); | |
6021 | ||
6022 | -- Validate_Remote_Access_To_Class_Wide_Type for attribute | |
6023 | -- Storage_Size since this attribute is not defined for | |
6024 | -- such types (RM E.2.3(22)). | |
6025 | ||
6026 | Validate_Remote_Access_To_Class_Wide_Type (N); | |
6027 | ||
29ba9f52 RD |
6028 | -- The prefix is allowed to be an implicit dereference of an |
6029 | -- access value designating a task. | |
996ae0b0 RK |
6030 | |
6031 | else | |
996ae0b0 RK |
6032 | Check_Task_Prefix; |
6033 | Set_Etype (N, Universal_Integer); | |
6034 | end if; | |
6035 | ||
6036 | else | |
822033eb | 6037 | Error_Attr_P ("prefix of % attribute must be access or task type"); |
996ae0b0 RK |
6038 | end if; |
6039 | ||
6040 | ------------------ | |
6041 | -- Storage_Unit -- | |
6042 | ------------------ | |
6043 | ||
6044 | when Attribute_Storage_Unit => | |
6045 | Standard_Attribute (Ttypes.System_Storage_Unit); | |
6046 | ||
82c80734 RD |
6047 | ----------------- |
6048 | -- Stream_Size -- | |
6049 | ----------------- | |
6050 | ||
6051 | when Attribute_Stream_Size => | |
6052 | Check_E0; | |
6053 | Check_Type; | |
6054 | ||
6055 | if Is_Entity_Name (P) | |
6056 | and then Is_Elementary_Type (Entity (P)) | |
6057 | then | |
6058 | Set_Etype (N, Universal_Integer); | |
6059 | else | |
822033eb | 6060 | Error_Attr_P ("invalid prefix for % attribute"); |
82c80734 RD |
6061 | end if; |
6062 | ||
468c6c8a ES |
6063 | --------------- |
6064 | -- Stub_Type -- | |
6065 | --------------- | |
6066 | ||
6067 | when Attribute_Stub_Type => | |
6068 | Check_Type; | |
6069 | Check_E0; | |
6070 | ||
25081892 AC |
6071 | if Is_Remote_Access_To_Class_Wide_Type (Base_Type (P_Type)) then |
6072 | ||
22243c12 | 6073 | -- For a real RACW [sub]type, use corresponding stub type |
25081892 | 6074 | |
22243c12 | 6075 | if not Is_Generic_Type (P_Type) then |
25081892 AC |
6076 | Rewrite (N, |
6077 | New_Occurrence_Of | |
6078 | (Corresponding_Stub_Type (Base_Type (P_Type)), Loc)); | |
6079 | ||
22243c12 RD |
6080 | -- For a generic type (that has been marked as an RACW using the |
6081 | -- Remote_Access_Type aspect or pragma), use a generic RACW stub | |
6082 | -- type. Note that if the actual is not a remote access type, the | |
6083 | -- instantiation will fail. | |
25081892 | 6084 | |
22243c12 | 6085 | else |
25081892 AC |
6086 | -- Note: we go to the underlying type here because the view |
6087 | -- returned by RTE (RE_RACW_Stub_Type) might be incomplete. | |
6088 | ||
6089 | Rewrite (N, | |
6090 | New_Occurrence_Of | |
6091 | (Underlying_Type (RTE (RE_RACW_Stub_Type)), Loc)); | |
6092 | end if; | |
6093 | ||
468c6c8a | 6094 | else |
822033eb | 6095 | Error_Attr_P |
8c519039 | 6096 | ("prefix of% attribute must be remote access-to-class-wide"); |
468c6c8a ES |
6097 | end if; |
6098 | ||
996ae0b0 RK |
6099 | ---------- |
6100 | -- Succ -- | |
6101 | ---------- | |
6102 | ||
6103 | when Attribute_Succ => | |
6104 | Check_Scalar_Type; | |
6105 | Check_E1; | |
7a489a2b AC |
6106 | |
6107 | if Is_Real_Type (P_Type) or else Is_Boolean_Type (P_Type) then | |
6108 | Error_Msg_Name_1 := Aname; | |
6109 | Error_Msg_Name_2 := Chars (P_Type); | |
ce5ba43a AC |
6110 | Check_SPARK_05_Restriction |
6111 | ("attribute% is not allowed for type%", P); | |
7a489a2b AC |
6112 | end if; |
6113 | ||
996ae0b0 RK |
6114 | Resolve (E1, P_Base_Type); |
6115 | Set_Etype (N, P_Base_Type); | |
6116 | ||
9ab5d86b RD |
6117 | -- Since Pred works on the base type, we normally do no check for the |
6118 | -- floating-point case, since the base type is unconstrained. But we | |
6119 | -- make an exception in Check_Float_Overflow mode. | |
996ae0b0 | 6120 | |
6cade1b0 | 6121 | if Is_Floating_Point_Type (P_Type) then |
d26d790d AC |
6122 | if not Range_Checks_Suppressed (P_Base_Type) then |
6123 | Set_Do_Range_Check (E1); | |
0083dd66 | 6124 | end if; |
996ae0b0 | 6125 | |
edd63e9b | 6126 | -- If not modular type, test for overflow check required |
996ae0b0 RK |
6127 | |
6128 | else | |
6129 | if not Is_Modular_Integer_Type (P_Type) | |
6130 | and then not Range_Checks_Suppressed (P_Base_Type) | |
6131 | then | |
6132 | Enable_Range_Check (E1); | |
6133 | end if; | |
6134 | end if; | |
6135 | ||
c5ecd6b7 AC |
6136 | -------------------------------- |
6137 | -- System_Allocator_Alignment -- | |
6138 | -------------------------------- | |
6139 | ||
6140 | when Attribute_System_Allocator_Alignment => | |
6141 | Standard_Attribute (Ttypes.System_Allocator_Alignment); | |
6142 | ||
996ae0b0 RK |
6143 | --------- |
6144 | -- Tag -- | |
6145 | --------- | |
6146 | ||
d8f43ee6 | 6147 | when Attribute_Tag => |
996ae0b0 RK |
6148 | Check_E0; |
6149 | Check_Dereference; | |
6150 | ||
6151 | if not Is_Tagged_Type (P_Type) then | |
822033eb | 6152 | Error_Attr_P ("prefix of % attribute must be tagged"); |
996ae0b0 | 6153 | |
324ac540 AC |
6154 | -- Next test does not apply to generated code why not, and what does |
6155 | -- the illegal reference mean??? | |
996ae0b0 RK |
6156 | |
6157 | elsif Is_Object_Reference (P) | |
6158 | and then not Is_Class_Wide_Type (P_Type) | |
6159 | and then Comes_From_Source (N) | |
6160 | then | |
822033eb HK |
6161 | Error_Attr_P |
6162 | ("% attribute can only be applied to objects " & | |
6163 | "of class - wide type"); | |
996ae0b0 RK |
6164 | end if; |
6165 | ||
324ac540 AC |
6166 | -- The prefix cannot be an incomplete type. However, references to |
6167 | -- 'Tag can be generated when expanding interface conversions, and | |
6168 | -- this is legal. | |
822033eb HK |
6169 | |
6170 | if Comes_From_Source (N) then | |
6171 | Check_Not_Incomplete_Type; | |
6172 | end if; | |
7b76e805 RD |
6173 | |
6174 | -- Set appropriate type | |
6175 | ||
996ae0b0 RK |
6176 | Set_Etype (N, RTE (RE_Tag)); |
6177 | ||
fbf5a39b AC |
6178 | ----------------- |
6179 | -- Target_Name -- | |
6180 | ----------------- | |
6181 | ||
6182 | when Attribute_Target_Name => Target_Name : declare | |
6183 | TN : constant String := Sdefault.Target_Name.all; | |
1d571f3b | 6184 | TL : Natural; |
fbf5a39b AC |
6185 | |
6186 | begin | |
6187 | Check_Standard_Prefix; | |
1d571f3b AC |
6188 | |
6189 | TL := TN'Last; | |
fbf5a39b AC |
6190 | |
6191 | if TN (TL) = '/' or else TN (TL) = '\' then | |
6192 | TL := TL - 1; | |
6193 | end if; | |
6194 | ||
fbf5a39b AC |
6195 | Rewrite (N, |
6196 | Make_String_Literal (Loc, | |
1d571f3b | 6197 | Strval => TN (TN'First .. TL))); |
fbf5a39b | 6198 | Analyze_And_Resolve (N, Standard_String); |
edab6088 | 6199 | Set_Is_Static_Expression (N, True); |
fbf5a39b AC |
6200 | end Target_Name; |
6201 | ||
996ae0b0 RK |
6202 | ---------------- |
6203 | -- Terminated -- | |
6204 | ---------------- | |
6205 | ||
6206 | when Attribute_Terminated => | |
6207 | Check_E0; | |
6208 | Set_Etype (N, Standard_Boolean); | |
6209 | Check_Task_Prefix; | |
6210 | ||
996ae0b0 RK |
6211 | ---------------- |
6212 | -- To_Address -- | |
6213 | ---------------- | |
6214 | ||
c1645ac8 AC |
6215 | when Attribute_To_Address => To_Address : declare |
6216 | Val : Uint; | |
c1645ac8 | 6217 | begin |
996ae0b0 RK |
6218 | Check_E1; |
6219 | Analyze (P); | |
f7ea2603 | 6220 | Check_System_Prefix; |
996ae0b0 RK |
6221 | |
6222 | Generate_Reference (RTE (RE_Address), P); | |
6223 | Analyze_And_Resolve (E1, Any_Integer); | |
6224 | Set_Etype (N, RTE (RE_Address)); | |
1e3c434f | 6225 | Set_Is_Static_Expression (N, Is_Static_Expression (E1)); |
edab6088 RD |
6226 | |
6227 | -- OK static expression case, check range and set appropriate type | |
c1645ac8 AC |
6228 | |
6229 | if Is_OK_Static_Expression (E1) then | |
6230 | Val := Expr_Value (E1); | |
6231 | ||
6232 | if Val < -(2 ** UI_From_Int (Standard'Address_Size - 1)) | |
6233 | or else | |
6234 | Val > 2 ** UI_From_Int (Standard'Address_Size) - 1 | |
6235 | then | |
6236 | Error_Attr ("address value out of range for % attribute", E1); | |
6237 | end if; | |
6238 | ||
7569f697 AC |
6239 | -- In most cases the expression is a numeric literal or some other |
6240 | -- address expression, but if it is a declared constant it may be | |
6241 | -- of a compatible type that must be left on the node. | |
6242 | ||
6243 | if Is_Entity_Name (E1) then | |
6244 | null; | |
6245 | ||
c1645ac8 AC |
6246 | -- Set type to universal integer if negative |
6247 | ||
7569f697 | 6248 | elsif Val < 0 then |
c1645ac8 AC |
6249 | Set_Etype (E1, Universal_Integer); |
6250 | ||
2d249f52 | 6251 | -- Otherwise set type to Unsigned_64 to accommodate max values |
c1645ac8 AC |
6252 | |
6253 | else | |
6254 | Set_Etype (E1, Standard_Unsigned_64); | |
6255 | end if; | |
6256 | end if; | |
6257 | end To_Address; | |
6258 | ||
54838d1f AC |
6259 | ------------ |
6260 | -- To_Any -- | |
6261 | ------------ | |
6262 | ||
6263 | when Attribute_To_Any => | |
6264 | Check_E1; | |
6265 | Check_PolyORB_Attribute; | |
6266 | Set_Etype (N, RTE (RE_Any)); | |
6267 | ||
996ae0b0 RK |
6268 | ---------------- |
6269 | -- Truncation -- | |
6270 | ---------------- | |
6271 | ||
6272 | when Attribute_Truncation => | |
6273 | Check_Floating_Point_Type_1; | |
6274 | Resolve (E1, P_Base_Type); | |
6275 | Set_Etype (N, P_Base_Type); | |
6276 | ||
6277 | ---------------- | |
6278 | -- Type_Class -- | |
6279 | ---------------- | |
6280 | ||
6281 | when Attribute_Type_Class => | |
6282 | Check_E0; | |
6283 | Check_Type; | |
6284 | Check_Not_Incomplete_Type; | |
6285 | Set_Etype (N, RTE (RE_Type_Class)); | |
6286 | ||
09494c32 AC |
6287 | -------------- |
6288 | -- TypeCode -- | |
6289 | -------------- | |
54838d1f AC |
6290 | |
6291 | when Attribute_TypeCode => | |
6292 | Check_E0; | |
6293 | Check_PolyORB_Attribute; | |
6294 | Set_Etype (N, RTE (RE_TypeCode)); | |
6295 | ||
9c870c90 AC |
6296 | -------------- |
6297 | -- Type_Key -- | |
6298 | -------------- | |
6299 | ||
f31dcd99 HK |
6300 | when Attribute_Type_Key => Type_Key : declare |
6301 | Full_Name : constant String_Id := | |
6302 | Fully_Qualified_Name_String (Entity (P)); | |
84a62ce8 | 6303 | |
f31dcd99 HK |
6304 | CRC : CRC32; |
6305 | -- The computed signature for the type | |
84a62ce8 | 6306 | |
f31dcd99 HK |
6307 | Deref : Boolean; |
6308 | -- To simplify the handling of mutually recursive types, follow a | |
6309 | -- single dereference link in a composite type. | |
84a62ce8 | 6310 | |
f31dcd99 | 6311 | procedure Compute_Type_Key (T : Entity_Id); |
11775988 | 6312 | -- Create a CRC integer from the declaration of the type. For a |
f31dcd99 HK |
6313 | -- composite type, fold in the representation of its components in |
6314 | -- recursive fashion. We use directly the source representation of | |
6315 | -- the types involved. | |
9c870c90 | 6316 | |
f31dcd99 HK |
6317 | ---------------------- |
6318 | -- Compute_Type_Key -- | |
6319 | ---------------------- | |
9c870c90 | 6320 | |
f31dcd99 HK |
6321 | procedure Compute_Type_Key (T : Entity_Id) is |
6322 | Buffer : Source_Buffer_Ptr; | |
6323 | P_Max : Source_Ptr; | |
6324 | P_Min : Source_Ptr; | |
6325 | Rep : Node_Id; | |
6326 | SFI : Source_File_Index; | |
ddc1515a | 6327 | |
f31dcd99 HK |
6328 | procedure Process_One_Declaration; |
6329 | -- Update CRC with the characters of one type declaration, or a | |
6330 | -- representation pragma that applies to the type. | |
9c870c90 | 6331 | |
f31dcd99 HK |
6332 | ----------------------------- |
6333 | -- Process_One_Declaration -- | |
6334 | ----------------------------- | |
84a62ce8 | 6335 | |
f31dcd99 | 6336 | procedure Process_One_Declaration is |
f31dcd99 | 6337 | begin |
f31dcd99 | 6338 | -- Scan type declaration, skipping blanks |
84a62ce8 | 6339 | |
11775988 | 6340 | for Ptr in P_Min .. P_Max loop |
f31dcd99 HK |
6341 | if Buffer (Ptr) /= ' ' then |
6342 | System.CRC32.Update (CRC, Buffer (Ptr)); | |
6343 | end if; | |
f31dcd99 HK |
6344 | end loop; |
6345 | end Process_One_Declaration; | |
84a62ce8 | 6346 | |
f31dcd99 | 6347 | -- Start of processing for Compute_Type_Key |
84a62ce8 | 6348 | |
f31dcd99 HK |
6349 | begin |
6350 | if Is_Itype (T) then | |
6351 | return; | |
6352 | end if; | |
84a62ce8 | 6353 | |
2bb988bb AC |
6354 | -- If the type is declared in Standard, there is no source, so |
6355 | -- just use its name. | |
6356 | ||
6357 | if Scope (T) = Standard_Standard then | |
6358 | declare | |
6359 | Name : constant String := Get_Name_String (Chars (T)); | |
6360 | begin | |
6361 | for J in Name'Range loop | |
6362 | System.CRC32.Update (CRC, Name (J)); | |
6363 | end loop; | |
6364 | end; | |
6365 | ||
6366 | return; | |
6367 | end if; | |
6368 | ||
f31dcd99 | 6369 | Sloc_Range (Enclosing_Declaration (T), P_Min, P_Max); |
11775988 AC |
6370 | SFI := Get_Source_File_Index (P_Min); |
6371 | pragma Assert (SFI = Get_Source_File_Index (P_Max)); | |
f31dcd99 | 6372 | Buffer := Source_Text (SFI); |
84a62ce8 | 6373 | |
f31dcd99 | 6374 | Process_One_Declaration; |
84a62ce8 | 6375 | |
f31dcd99 | 6376 | -- Recurse on relevant component types |
84a62ce8 | 6377 | |
f31dcd99 HK |
6378 | if Is_Array_Type (T) then |
6379 | Compute_Type_Key (Component_Type (T)); | |
84a62ce8 | 6380 | |
f31dcd99 HK |
6381 | elsif Is_Access_Type (T) then |
6382 | if not Deref then | |
6383 | Deref := True; | |
6384 | Compute_Type_Key (Designated_Type (T)); | |
6385 | end if; | |
ddc1515a | 6386 | |
f31dcd99 | 6387 | elsif Is_Derived_Type (T) then |
11775988 | 6388 | Compute_Type_Key (Etype (T)); |
84a62ce8 | 6389 | |
f31dcd99 HK |
6390 | elsif Is_Record_Type (T) then |
6391 | declare | |
6392 | Comp : Entity_Id; | |
6393 | begin | |
6394 | Comp := First_Component (T); | |
6395 | while Present (Comp) loop | |
6396 | Compute_Type_Key (Etype (Comp)); | |
6397 | Next_Component (Comp); | |
6398 | end loop; | |
6399 | end; | |
6400 | end if; | |
84a62ce8 | 6401 | |
b63d61f7 | 6402 | if Is_First_Subtype (T) then |
84a62ce8 | 6403 | |
b63d61f7 AC |
6404 | -- Fold in representation aspects for the type, which appear in |
6405 | -- the same source buffer. If the representation aspects are in | |
6406 | -- a different source file, then skip them; they apply to some | |
6407 | -- other type, perhaps one we're derived from. | |
84a62ce8 | 6408 | |
b63d61f7 | 6409 | Rep := First_Rep_Item (T); |
84a62ce8 | 6410 | |
b63d61f7 AC |
6411 | while Present (Rep) loop |
6412 | if Comes_From_Source (Rep) then | |
6413 | Sloc_Range (Rep, P_Min, P_Max); | |
6414 | ||
6415 | if SFI = Get_Source_File_Index (P_Min) then | |
6416 | pragma Assert (SFI = Get_Source_File_Index (P_Max)); | |
6417 | Process_One_Declaration; | |
6418 | end if; | |
6419 | end if; | |
6420 | ||
6421 | Rep := Next_Rep_Item (Rep); | |
6422 | end loop; | |
6423 | end if; | |
f31dcd99 | 6424 | end Compute_Type_Key; |
84a62ce8 | 6425 | |
f31dcd99 | 6426 | -- Start of processing for Type_Key |
9c870c90 | 6427 | |
f31dcd99 HK |
6428 | begin |
6429 | Check_E0; | |
6430 | Check_Type; | |
84a62ce8 | 6431 | |
f31dcd99 HK |
6432 | Start_String; |
6433 | Deref := False; | |
84a62ce8 | 6434 | |
f31dcd99 | 6435 | -- Copy all characters in Full_Name but the trailing NUL |
84a62ce8 | 6436 | |
f31dcd99 HK |
6437 | for J in 1 .. String_Length (Full_Name) - 1 loop |
6438 | Store_String_Char (Get_String_Char (Full_Name, Pos (J))); | |
6439 | end loop; | |
84a62ce8 | 6440 | |
2bb988bb AC |
6441 | -- Compute CRC and convert it to string one character at a time, so |
6442 | -- as not to use Image within the compiler. | |
84a62ce8 | 6443 | |
2bb988bb AC |
6444 | Initialize (CRC); |
6445 | Compute_Type_Key (Entity (P)); | |
84a62ce8 | 6446 | |
2bb988bb AC |
6447 | if not Is_Frozen (Entity (P)) then |
6448 | Error_Msg_N ("premature usage of Type_Key?", N); | |
f31dcd99 | 6449 | end if; |
9c870c90 | 6450 | |
2bb988bb AC |
6451 | while CRC > 0 loop |
6452 | Store_String_Char (Character'Val (48 + (CRC rem 10))); | |
6453 | CRC := CRC / 10; | |
6454 | end loop; | |
6455 | ||
f31dcd99 | 6456 | Rewrite (N, Make_String_Literal (Loc, End_String)); |
9c870c90 | 6457 | Analyze_And_Resolve (N, Standard_String); |
f31dcd99 | 6458 | end Type_Key; |
9c870c90 | 6459 | |
996ae0b0 RK |
6460 | ----------------------- |
6461 | -- Unbiased_Rounding -- | |
6462 | ----------------------- | |
6463 | ||
6464 | when Attribute_Unbiased_Rounding => | |
6465 | Check_Floating_Point_Type_1; | |
6466 | Set_Etype (N, P_Base_Type); | |
6467 | Resolve (E1, P_Base_Type); | |
6468 | ||
6469 | ---------------------- | |
6470 | -- Unchecked_Access -- | |
6471 | ---------------------- | |
6472 | ||
6473 | when Attribute_Unchecked_Access => | |
6474 | if Comes_From_Source (N) then | |
6475 | Check_Restriction (No_Unchecked_Access, N); | |
6476 | end if; | |
6477 | ||
fbf5a39b | 6478 | Analyze_Access_Attribute; |
22efcab7 | 6479 | Check_Not_Incomplete_Type; |
fbf5a39b AC |
6480 | |
6481 | ------------------------- | |
6482 | -- Unconstrained_Array -- | |
6483 | ------------------------- | |
6484 | ||
6485 | when Attribute_Unconstrained_Array => | |
6486 | Check_E0; | |
6487 | Check_Type; | |
6488 | Check_Not_Incomplete_Type; | |
6489 | Set_Etype (N, Standard_Boolean); | |
edab6088 | 6490 | Set_Is_Static_Expression (N, True); |
996ae0b0 RK |
6491 | |
6492 | ------------------------------ | |
6493 | -- Universal_Literal_String -- | |
6494 | ------------------------------ | |
6495 | ||
6496 | -- This is a GNAT specific attribute whose prefix must be a named | |
6497 | -- number where the expression is either a single numeric literal, | |
6498 | -- or a numeric literal immediately preceded by a minus sign. The | |
6499 | -- result is equivalent to a string literal containing the text of | |
6500 | -- the literal as it appeared in the source program with a possible | |
6501 | -- leading minus sign. | |
6502 | ||
d8f43ee6 | 6503 | when Attribute_Universal_Literal_String => |
996ae0b0 RK |
6504 | Check_E0; |
6505 | ||
6506 | if not Is_Entity_Name (P) | |
6507 | or else Ekind (Entity (P)) not in Named_Kind | |
6508 | then | |
822033eb | 6509 | Error_Attr_P ("prefix for % attribute must be named number"); |
996ae0b0 RK |
6510 | |
6511 | else | |
6512 | declare | |
6513 | Expr : Node_Id; | |
6514 | Negative : Boolean; | |
6515 | S : Source_Ptr; | |
6516 | Src : Source_Buffer_Ptr; | |
6517 | ||
6518 | begin | |
6519 | Expr := Original_Node (Expression (Parent (Entity (P)))); | |
6520 | ||
6521 | if Nkind (Expr) = N_Op_Minus then | |
6522 | Negative := True; | |
6523 | Expr := Original_Node (Right_Opnd (Expr)); | |
6524 | else | |
6525 | Negative := False; | |
6526 | end if; | |
6527 | ||
e10dab7f | 6528 | if not Nkind_In (Expr, N_Integer_Literal, N_Real_Literal) then |
996ae0b0 RK |
6529 | Error_Attr |
6530 | ("named number for % attribute must be simple literal", N); | |
6531 | end if; | |
6532 | ||
6533 | -- Build string literal corresponding to source literal text | |
6534 | ||
6535 | Start_String; | |
6536 | ||
6537 | if Negative then | |
6538 | Store_String_Char (Get_Char_Code ('-')); | |
6539 | end if; | |
6540 | ||
6541 | S := Sloc (Expr); | |
6542 | Src := Source_Text (Get_Source_File_Index (S)); | |
6543 | ||
6544 | while Src (S) /= ';' and then Src (S) /= ' ' loop | |
6545 | Store_String_Char (Get_Char_Code (Src (S))); | |
6546 | S := S + 1; | |
6547 | end loop; | |
6548 | ||
6549 | -- Now we rewrite the attribute with the string literal | |
6550 | ||
6551 | Rewrite (N, | |
6552 | Make_String_Literal (Loc, End_String)); | |
6553 | Analyze (N); | |
edab6088 | 6554 | Set_Is_Static_Expression (N, True); |
996ae0b0 RK |
6555 | end; |
6556 | end if; | |
996ae0b0 RK |
6557 | |
6558 | ------------------------- | |
6559 | -- Unrestricted_Access -- | |
6560 | ------------------------- | |
6561 | ||
6562 | -- This is a GNAT specific attribute which is like Access except that | |
3cd4a210 AC |
6563 | -- all scope checks and checks for aliased views are omitted. It is |
6564 | -- documented as being equivalent to the use of the Address attribute | |
6565 | -- followed by an unchecked conversion to the target access type. | |
996ae0b0 RK |
6566 | |
6567 | when Attribute_Unrestricted_Access => | |
dc36a7e3 RD |
6568 | |
6569 | -- If from source, deal with relevant restrictions | |
6570 | ||
996ae0b0 RK |
6571 | if Comes_From_Source (N) then |
6572 | Check_Restriction (No_Unchecked_Access, N); | |
83de674b | 6573 | |
67c86178 | 6574 | if Nkind (P) in N_Has_Entity |
dc36a7e3 RD |
6575 | and then Present (Entity (P)) |
6576 | and then Is_Object (Entity (P)) | |
67c86178 | 6577 | then |
83de674b AC |
6578 | Check_Restriction (No_Implicit_Aliasing, N); |
6579 | end if; | |
996ae0b0 RK |
6580 | end if; |
6581 | ||
6582 | if Is_Entity_Name (P) then | |
6583 | Set_Address_Taken (Entity (P)); | |
6584 | end if; | |
6585 | ||
3cd4a210 AC |
6586 | -- It might seem reasonable to call Address_Checks here to apply the |
6587 | -- same set of semantic checks that we enforce for 'Address (after | |
6588 | -- all we document Unrestricted_Access as being equivalent to the | |
6589 | -- use of Address followed by an Unchecked_Conversion). However, if | |
6590 | -- we do enable these checks, we get multiple failures in both the | |
6591 | -- compiler run-time and in our regression test suite, so we leave | |
6592 | -- out these checks for now. To be investigated further some time??? | |
6593 | ||
6594 | -- Address_Checks; | |
6595 | ||
6596 | -- Now complete analysis using common access processing | |
6597 | ||
fbf5a39b | 6598 | Analyze_Access_Attribute; |
996ae0b0 | 6599 | |
18a2ad5d AC |
6600 | ------------ |
6601 | -- Update -- | |
6602 | ------------ | |
6603 | ||
6604 | when Attribute_Update => Update : declare | |
cc6f5d75 AC |
6605 | Common_Typ : Entity_Id; |
6606 | -- The common type of a multiple component update for a record | |
6607 | ||
18a2ad5d | 6608 | Comps : Elist_Id := No_Elist; |
cc6f5d75 AC |
6609 | -- A list used in the resolution of a record update. It contains the |
6610 | -- entities of all record components processed so far. | |
18a2ad5d | 6611 | |
cc6f5d75 AC |
6612 | procedure Analyze_Array_Component_Update (Assoc : Node_Id); |
6613 | -- Analyze and resolve array_component_association Assoc against the | |
6614 | -- index of array type P_Type. | |
18a2ad5d | 6615 | |
cc6f5d75 AC |
6616 | procedure Analyze_Record_Component_Update (Comp : Node_Id); |
6617 | -- Analyze and resolve record_component_association Comp against | |
6618 | -- record type P_Type. | |
18a2ad5d | 6619 | |
cc6f5d75 AC |
6620 | ------------------------------------ |
6621 | -- Analyze_Array_Component_Update -- | |
6622 | ------------------------------------ | |
18a2ad5d | 6623 | |
cc6f5d75 AC |
6624 | procedure Analyze_Array_Component_Update (Assoc : Node_Id) is |
6625 | Expr : Node_Id; | |
6626 | High : Node_Id; | |
6627 | Index : Node_Id; | |
6628 | Index_Typ : Entity_Id; | |
6629 | Low : Node_Id; | |
18a2ad5d | 6630 | |
cc6f5d75 AC |
6631 | begin |
6632 | -- The current association contains a sequence of indexes denoting | |
6633 | -- an element of a multidimensional array: | |
18a2ad5d | 6634 | |
cc6f5d75 | 6635 | -- (Index_1, ..., Index_N) |
18a2ad5d | 6636 | |
cc6f5d75 AC |
6637 | -- Examine each individual index and resolve it against the proper |
6638 | -- index type of the array. | |
6639 | ||
6640 | if Nkind (First (Choices (Assoc))) = N_Aggregate then | |
6641 | Expr := First (Choices (Assoc)); | |
6642 | while Present (Expr) loop | |
6643 | ||
6644 | -- The use of others is illegal (SPARK RM 4.4.1(12)) | |
6645 | ||
6646 | if Nkind (Expr) = N_Others_Choice then | |
6647 | Error_Attr | |
6648 | ("others choice not allowed in attribute %", Expr); | |
6649 | ||
6650 | -- Otherwise analyze and resolve all indexes | |
6651 | ||
6652 | else | |
6653 | Index := First (Expressions (Expr)); | |
6654 | Index_Typ := First_Index (P_Type); | |
6655 | while Present (Index) and then Present (Index_Typ) loop | |
6656 | Analyze_And_Resolve (Index, Etype (Index_Typ)); | |
6657 | Next (Index); | |
6658 | Next_Index (Index_Typ); | |
6659 | end loop; | |
6660 | ||
6661 | -- Detect a case where the association either lacks an | |
6662 | -- index or contains an extra index. | |
6663 | ||
6664 | if Present (Index) or else Present (Index_Typ) then | |
6665 | Error_Msg_N | |
6666 | ("dimension mismatch in index list", Assoc); | |
18a2ad5d | 6667 | end if; |
cc6f5d75 | 6668 | end if; |
18a2ad5d | 6669 | |
cc6f5d75 AC |
6670 | Next (Expr); |
6671 | end loop; | |
6672 | ||
6673 | -- The current association denotes either a single component or a | |
6674 | -- range of components of a one dimensional array: | |
6675 | ||
6676 | -- 1, 2 .. 5 | |
6677 | ||
6678 | -- Resolve the index or its high and low bounds (if range) against | |
6679 | -- the proper index type of the array. | |
6680 | ||
6681 | else | |
6682 | Index := First (Choices (Assoc)); | |
6683 | Index_Typ := First_Index (P_Type); | |
6684 | ||
6685 | if Present (Next_Index (Index_Typ)) then | |
6686 | Error_Msg_N ("too few subscripts in array reference", Assoc); | |
18a2ad5d AC |
6687 | end if; |
6688 | ||
cc6f5d75 | 6689 | while Present (Index) loop |
18a2ad5d | 6690 | |
cc6f5d75 | 6691 | -- The use of others is illegal (SPARK RM 4.4.1(12)) |
18a2ad5d | 6692 | |
cc6f5d75 AC |
6693 | if Nkind (Index) = N_Others_Choice then |
6694 | Error_Attr | |
6695 | ("others choice not allowed in attribute %", Index); | |
6696 | ||
6697 | -- The index denotes a range of elements | |
6698 | ||
6699 | elsif Nkind (Index) = N_Range then | |
6700 | Low := Low_Bound (Index); | |
6701 | High := High_Bound (Index); | |
6702 | ||
6703 | Analyze_And_Resolve (Low, Etype (Index_Typ)); | |
6704 | Analyze_And_Resolve (High, Etype (Index_Typ)); | |
6705 | ||
6706 | -- Add a range check to ensure that the bounds of the | |
6707 | -- range are within the index type when this cannot be | |
6708 | -- determined statically. | |
6709 | ||
6710 | if not Is_OK_Static_Expression (Low) then | |
6711 | Set_Do_Range_Check (Low); | |
6712 | end if; | |
6713 | ||
6714 | if not Is_OK_Static_Expression (High) then | |
6715 | Set_Do_Range_Check (High); | |
6716 | end if; | |
6717 | ||
6718 | -- Otherwise the index denotes a single element | |
6719 | ||
6720 | else | |
6721 | Analyze_And_Resolve (Index, Etype (Index_Typ)); | |
6722 | ||
6723 | -- Add a range check to ensure that the index is within | |
6724 | -- the index type when it is not possible to determine | |
6725 | -- this statically. | |
6726 | ||
6727 | if not Is_OK_Static_Expression (Index) then | |
6728 | Set_Do_Range_Check (Index); | |
6729 | end if; | |
6730 | end if; | |
6731 | ||
6732 | Next (Index); | |
6733 | end loop; | |
6734 | end if; | |
6735 | end Analyze_Array_Component_Update; | |
6736 | ||
6737 | ------------------------------------- | |
6738 | -- Analyze_Record_Component_Update -- | |
6739 | ------------------------------------- | |
18a2ad5d | 6740 | |
cc6f5d75 AC |
6741 | procedure Analyze_Record_Component_Update (Comp : Node_Id) is |
6742 | Comp_Name : constant Name_Id := Chars (Comp); | |
6743 | Base_Typ : Entity_Id; | |
6744 | Comp_Or_Discr : Entity_Id; | |
18a2ad5d AC |
6745 | |
6746 | begin | |
6747 | -- Find the discriminant or component whose name corresponds to | |
6748 | -- Comp. A simple character comparison is sufficient because all | |
6749 | -- visible names within a record type are unique. | |
6750 | ||
cc6f5d75 | 6751 | Comp_Or_Discr := First_Entity (P_Type); |
18a2ad5d AC |
6752 | while Present (Comp_Or_Discr) loop |
6753 | if Chars (Comp_Or_Discr) = Comp_Name then | |
08cd7c2f | 6754 | |
cc6f5d75 AC |
6755 | -- Decorate the component reference by setting its entity |
6756 | -- and type for resolution purposes. | |
08cd7c2f AC |
6757 | |
6758 | Set_Entity (Comp, Comp_Or_Discr); | |
d950f051 | 6759 | Set_Etype (Comp, Etype (Comp_Or_Discr)); |
18a2ad5d AC |
6760 | exit; |
6761 | end if; | |
6762 | ||
6763 | Comp_Or_Discr := Next_Entity (Comp_Or_Discr); | |
6764 | end loop; | |
6765 | ||
cc6f5d75 | 6766 | -- Diagnose an illegal reference |
18a2ad5d AC |
6767 | |
6768 | if Present (Comp_Or_Discr) then | |
6769 | if Ekind (Comp_Or_Discr) = E_Discriminant then | |
6770 | Error_Attr | |
6771 | ("attribute % may not modify record discriminants", Comp); | |
6772 | ||
6773 | else pragma Assert (Ekind (Comp_Or_Discr) = E_Component); | |
cc6f5d75 AC |
6774 | if Contains (Comps, Comp_Or_Discr) then |
6775 | Error_Msg_N ("component & already updated", Comp); | |
18a2ad5d AC |
6776 | |
6777 | -- Mark this component as processed | |
6778 | ||
6779 | else | |
21c51f53 | 6780 | Append_New_Elmt (Comp_Or_Discr, Comps); |
18a2ad5d AC |
6781 | end if; |
6782 | end if; | |
6783 | ||
6784 | -- The update aggregate mentions an entity that does not belong to | |
6785 | -- the record type. | |
6786 | ||
6787 | else | |
cc6f5d75 AC |
6788 | Error_Msg_N ("& is not a component of aggregate subtype", Comp); |
6789 | end if; | |
6790 | ||
6791 | -- Verify the consistency of types when the current component is | |
6792 | -- part of a miltiple component update. | |
6793 | ||
6794 | -- Comp_1, ..., Comp_N => <value> | |
6795 | ||
6796 | if Present (Etype (Comp)) then | |
6797 | Base_Typ := Base_Type (Etype (Comp)); | |
6798 | ||
6799 | -- Save the type of the first component reference as the | |
6800 | -- remaning references (if any) must resolve to this type. | |
6801 | ||
6802 | if No (Common_Typ) then | |
6803 | Common_Typ := Base_Typ; | |
6804 | ||
6805 | elsif Base_Typ /= Common_Typ then | |
6806 | Error_Msg_N | |
6807 | ("components in choice list must have same type", Comp); | |
6808 | end if; | |
18a2ad5d | 6809 | end if; |
cc6f5d75 | 6810 | end Analyze_Record_Component_Update; |
18a2ad5d AC |
6811 | |
6812 | -- Local variables | |
6813 | ||
cc6f5d75 AC |
6814 | Assoc : Node_Id; |
6815 | Comp : Node_Id; | |
18a2ad5d AC |
6816 | |
6817 | -- Start of processing for Update | |
6818 | ||
6819 | begin | |
18a2ad5d AC |
6820 | Check_E1; |
6821 | ||
6822 | if not Is_Object_Reference (P) then | |
6823 | Error_Attr_P ("prefix of attribute % must denote an object"); | |
6824 | ||
6825 | elsif not Is_Array_Type (P_Type) | |
6826 | and then not Is_Record_Type (P_Type) | |
6827 | then | |
6828 | Error_Attr_P ("prefix of attribute % must be a record or array"); | |
6829 | ||
51245e2d | 6830 | elsif Is_Limited_View (P_Type) then |
18a2ad5d AC |
6831 | Error_Attr ("prefix of attribute % cannot be limited", N); |
6832 | ||
6833 | elsif Nkind (E1) /= N_Aggregate then | |
6834 | Error_Attr ("attribute % requires component association list", N); | |
6835 | end if; | |
6836 | ||
6837 | -- Inspect the update aggregate, looking at all the associations and | |
6838 | -- choices. Perform the following checks: | |
6839 | ||
6840 | -- 1) Legality of "others" in all cases | |
cc6f5d75 AC |
6841 | -- 2) Legality of <> |
6842 | -- 3) Component legality for arrays | |
6843 | -- 4) Component legality for records | |
18a2ad5d AC |
6844 | |
6845 | -- The remaining checks are performed on the expanded attribute | |
6846 | ||
6847 | Assoc := First (Component_Associations (E1)); | |
6848 | while Present (Assoc) loop | |
162c21d9 | 6849 | |
cc6f5d75 | 6850 | -- The use of <> is illegal (SPARK RM 4.4.1(1)) |
162c21d9 | 6851 | |
cc6f5d75 AC |
6852 | if Box_Present (Assoc) then |
6853 | Error_Attr | |
6854 | ("default initialization not allowed in attribute %", Assoc); | |
a6abfd78 | 6855 | |
cc6f5d75 | 6856 | -- Otherwise process the association |
d0ef7921 | 6857 | |
cc6f5d75 AC |
6858 | else |
6859 | Analyze (Expression (Assoc)); | |
6907542d | 6860 | |
cc6f5d75 AC |
6861 | if Is_Array_Type (P_Type) then |
6862 | Analyze_Array_Component_Update (Assoc); | |
cf28c974 | 6863 | |
cc6f5d75 | 6864 | elsif Is_Record_Type (P_Type) then |
6907542d | 6865 | |
cc6f5d75 AC |
6866 | -- Reset the common type used in a multiple component update |
6867 | -- as we are processing the contents of a new association. | |
cf28c974 | 6868 | |
cc6f5d75 | 6869 | Common_Typ := Empty; |
162c21d9 | 6870 | |
cc6f5d75 AC |
6871 | Comp := First (Choices (Assoc)); |
6872 | while Present (Comp) loop | |
6873 | if Nkind (Comp) = N_Identifier then | |
6874 | Analyze_Record_Component_Update (Comp); | |
50ea6357 | 6875 | |
cc6f5d75 | 6876 | -- The use of others is illegal (SPARK RM 4.4.1(5)) |
d0ef7921 | 6877 | |
cc6f5d75 AC |
6878 | elsif Nkind (Comp) = N_Others_Choice then |
6879 | Error_Attr | |
6880 | ("others choice not allowed in attribute %", Comp); | |
162c21d9 | 6881 | |
cc6f5d75 AC |
6882 | -- The name of a record component cannot appear in any |
6883 | -- other form. | |
162c21d9 | 6884 | |
d0ef7921 | 6885 | else |
46de64ca | 6886 | Error_Msg_N |
cc6f5d75 | 6887 | ("name should be identifier or OTHERS", Comp); |
46de64ca | 6888 | end if; |
18a2ad5d | 6889 | |
cc6f5d75 AC |
6890 | Next (Comp); |
6891 | end loop; | |
6892 | end if; | |
6893 | end if; | |
18a2ad5d AC |
6894 | |
6895 | Next (Assoc); | |
6896 | end loop; | |
6897 | ||
cc6f5d75 | 6898 | -- The type of attribute 'Update is that of the prefix |
18a2ad5d AC |
6899 | |
6900 | Set_Etype (N, P_Type); | |
71140fc6 YM |
6901 | |
6902 | Sem_Warn.Warn_On_Suspicious_Update (N); | |
18a2ad5d AC |
6903 | end Update; |
6904 | ||
996ae0b0 RK |
6905 | --------- |
6906 | -- Val -- | |
6907 | --------- | |
6908 | ||
d8f43ee6 | 6909 | when Attribute_Val => |
996ae0b0 RK |
6910 | Check_E1; |
6911 | Check_Discrete_Type; | |
7a489a2b AC |
6912 | |
6913 | if Is_Boolean_Type (P_Type) then | |
6914 | Error_Msg_Name_1 := Aname; | |
6915 | Error_Msg_Name_2 := Chars (P_Type); | |
ce5ba43a | 6916 | Check_SPARK_05_Restriction |
7a489a2b AC |
6917 | ("attribute% is not allowed for type%", P); |
6918 | end if; | |
6919 | ||
996ae0b0 RK |
6920 | -- Note, we need a range check in general, but we wait for the |
6921 | -- Resolve call to do this, since we want to let Eval_Attribute | |
a90bd866 | 6922 | -- have a chance to find an static illegality first. |
d8f43ee6 HK |
6923 | |
6924 | Resolve (E1, Any_Integer); | |
6925 | Set_Etype (N, P_Base_Type); | |
996ae0b0 RK |
6926 | |
6927 | ----------- | |
6928 | -- Valid -- | |
6929 | ----------- | |
6930 | ||
f16cb8df HK |
6931 | when Attribute_Valid => Valid : declare |
6932 | Pred_Func : constant Entity_Id := Predicate_Function (P_Type); | |
6933 | ||
6934 | begin | |
996ae0b0 RK |
6935 | Check_E0; |
6936 | ||
6937 | -- Ignore check for object if we have a 'Valid reference generated | |
6938 | -- by the expanded code, since in some cases valid checks can occur | |
6939 | -- on items that are names, but are not objects (e.g. attributes). | |
6940 | ||
6941 | if Comes_From_Source (N) then | |
6942 | Check_Object_Reference (P); | |
996ae0b0 | 6943 | |
f16cb8df HK |
6944 | if not Is_Scalar_Type (P_Type) then |
6945 | Error_Attr_P ("object for % attribute must be of scalar type"); | |
6946 | end if; | |
97948f41 | 6947 | |
f16cb8df HK |
6948 | -- If the attribute appears within the subtype's own predicate |
6949 | -- function, then issue a warning that this will cause infinite | |
6950 | -- recursion. | |
97948f41 | 6951 | |
97948f41 | 6952 | if Present (Pred_Func) and then Current_Scope = Pred_Func then |
f16cb8df | 6953 | Error_Msg_N ("attribute Valid requires a predicate check??", N); |
324ac540 | 6954 | Error_Msg_N ("\and will result in infinite recursion??", N); |
97948f41 | 6955 | end if; |
f16cb8df | 6956 | end if; |
97948f41 | 6957 | |
996ae0b0 | 6958 | Set_Etype (N, Standard_Boolean); |
f16cb8df | 6959 | end Valid; |
996ae0b0 | 6960 | |
2a1f6a1f AC |
6961 | ------------------- |
6962 | -- Valid_Scalars -- | |
6963 | ------------------- | |
6964 | ||
f16cb8df HK |
6965 | when Attribute_Valid_Scalars => Valid_Scalars : declare |
6966 | begin | |
2a1f6a1f | 6967 | Check_E0; |
99fc068e | 6968 | |
45ec05e1 | 6969 | if Comes_From_Source (N) then |
f16cb8df | 6970 | Check_Object_Reference (P); |
45ec05e1 | 6971 | |
f16cb8df HK |
6972 | -- Do not emit any diagnostics related to private types to avoid |
6973 | -- disclosing the structure of the type. | |
45ec05e1 | 6974 | |
f16cb8df HK |
6975 | if Is_Private_Type (P_Type) then |
6976 | ||
6977 | -- Attribute 'Valid_Scalars is not supported on private tagged | |
6978 | -- types due to a code generation issue. Is_Visible_Component | |
6979 | -- does not allow for a component of a private tagged type to | |
6980 | -- be successfully retrieved. | |
6981 | ||
6982 | -- Do not use Error_Attr_P because this bypasses any subsequent | |
6983 | -- processing and leaves the attribute with type Any_Type. This | |
6984 | -- in turn prevents the proper expansion of the attribute into | |
6985 | -- True. | |
6986 | ||
6987 | if Is_Tagged_Type (P_Type) then | |
6988 | Error_Msg_Name_1 := Aname; | |
6989 | Error_Msg_N ("??effects of attribute % are ignored", N); | |
6990 | end if; | |
6991 | ||
6992 | -- Otherwise the type is not private | |
6993 | ||
6994 | else | |
6995 | if not Scalar_Part_Present (P_Type) then | |
026733d8 JM |
6996 | Error_Msg_Name_1 := Aname; |
6997 | Error_Msg_F | |
6998 | ("??attribute % always True, no scalars to check", P); | |
6999 | Set_Boolean_Result (N, True); | |
f16cb8df HK |
7000 | end if; |
7001 | ||
7002 | -- Attribute 'Valid_Scalars is illegal on unchecked union types | |
7003 | -- because it is not always guaranteed that the components are | |
7004 | -- retrievable based on whether the discriminants are inferable | |
7005 | ||
7006 | if Has_Unchecked_Union (P_Type) then | |
7007 | Error_Attr_P | |
7008 | ("attribute % not allowed for Unchecked_Union type"); | |
7009 | end if; | |
45ec05e1 RD |
7010 | end if; |
7011 | end if; | |
2a1f6a1f | 7012 | |
f16cb8df HK |
7013 | Set_Etype (N, Standard_Boolean); |
7014 | end Valid_Scalars; | |
7015 | ||
996ae0b0 RK |
7016 | ----------- |
7017 | -- Value -- | |
7018 | ----------- | |
7019 | ||
d8f43ee6 | 7020 | when Attribute_Value => |
ce5ba43a | 7021 | Check_SPARK_05_Restriction_On_Attribute; |
996ae0b0 RK |
7022 | Check_E1; |
7023 | Check_Scalar_Type; | |
7024 | ||
442ade9d RD |
7025 | -- Case of enumeration type |
7026 | ||
3e7302c3 AC |
7027 | -- When an enumeration type appears in an attribute reference, all |
7028 | -- literals of the type are marked as referenced. This must only be | |
7029 | -- done if the attribute reference appears in the current source. | |
7030 | -- Otherwise the information on references may differ between a | |
7031 | -- normal compilation and one that performs inlining. | |
7032 | ||
8097203f AC |
7033 | if Is_Enumeration_Type (P_Type) |
7034 | and then In_Extended_Main_Code_Unit (N) | |
7035 | then | |
996ae0b0 | 7036 | Check_Restriction (No_Enumeration_Maps, N); |
442ade9d RD |
7037 | |
7038 | -- Mark all enumeration literals as referenced, since the use of | |
7039 | -- the Value attribute can implicitly reference any of the | |
7040 | -- literals of the enumeration base type. | |
7041 | ||
7042 | declare | |
7043 | Ent : Entity_Id := First_Literal (P_Base_Type); | |
7044 | begin | |
7045 | while Present (Ent) loop | |
7046 | Set_Referenced (Ent); | |
7047 | Next_Literal (Ent); | |
7048 | end loop; | |
7049 | end; | |
996ae0b0 RK |
7050 | end if; |
7051 | ||
fbf5a39b AC |
7052 | -- Set Etype before resolving expression because expansion of |
7053 | -- expression may require enclosing type. Note that the type | |
7054 | -- returned by 'Value is the base type of the prefix type. | |
996ae0b0 | 7055 | |
fbf5a39b | 7056 | Set_Etype (N, P_Base_Type); |
996ae0b0 | 7057 | Validate_Non_Static_Attribute_Function_Call; |
0688dac8 RD |
7058 | |
7059 | -- Check restriction No_Fixed_IO | |
7060 | ||
7061 | if Restriction_Check_Required (No_Fixed_IO) | |
7062 | and then Is_Fixed_Point_Type (P_Type) | |
7063 | then | |
7064 | Check_Restriction (No_Fixed_IO, P); | |
7065 | end if; | |
996ae0b0 RK |
7066 | |
7067 | ---------------- | |
7068 | -- Value_Size -- | |
7069 | ---------------- | |
7070 | ||
7071 | when Attribute_Value_Size => | |
7072 | Check_E0; | |
7073 | Check_Type; | |
7074 | Check_Not_Incomplete_Type; | |
7075 | Set_Etype (N, Universal_Integer); | |
7076 | ||
7077 | ------------- | |
7078 | -- Version -- | |
7079 | ------------- | |
7080 | ||
7081 | when Attribute_Version => | |
7082 | Check_E0; | |
7083 | Check_Program_Unit; | |
7084 | Set_Etype (N, RTE (RE_Version_String)); | |
7085 | ||
7086 | ------------------ | |
7087 | -- Wchar_T_Size -- | |
7088 | ------------------ | |
7089 | ||
7090 | when Attribute_Wchar_T_Size => | |
7091 | Standard_Attribute (Interfaces_Wchar_T_Size); | |
7092 | ||
7093 | ---------------- | |
7094 | -- Wide_Image -- | |
7095 | ---------------- | |
7096 | ||
d8f43ee6 | 7097 | when Attribute_Wide_Image => |
b276ab7a | 7098 | Analyze_Image_Attribute (Standard_Wide_String); |
996ae0b0 | 7099 | |
82c80734 RD |
7100 | --------------------- |
7101 | -- Wide_Wide_Image -- | |
7102 | --------------------- | |
7103 | ||
d8f43ee6 | 7104 | when Attribute_Wide_Wide_Image => |
b276ab7a | 7105 | Analyze_Image_Attribute (Standard_Wide_Wide_String); |
82c80734 | 7106 | |
996ae0b0 RK |
7107 | ---------------- |
7108 | -- Wide_Value -- | |
7109 | ---------------- | |
7110 | ||
d8f43ee6 | 7111 | when Attribute_Wide_Value => |
ce5ba43a | 7112 | Check_SPARK_05_Restriction_On_Attribute; |
996ae0b0 RK |
7113 | Check_E1; |
7114 | Check_Scalar_Type; | |
7115 | ||
7116 | -- Set Etype before resolving expression because expansion | |
7117 | -- of expression may require enclosing type. | |
7118 | ||
7119 | Set_Etype (N, P_Type); | |
7120 | Validate_Non_Static_Attribute_Function_Call; | |
0688dac8 RD |
7121 | |
7122 | -- Check restriction No_Fixed_IO | |
7123 | ||
7124 | if Restriction_Check_Required (No_Fixed_IO) | |
7125 | and then Is_Fixed_Point_Type (P_Type) | |
7126 | then | |
7127 | Check_Restriction (No_Fixed_IO, P); | |
7128 | end if; | |
996ae0b0 | 7129 | |
82c80734 RD |
7130 | --------------------- |
7131 | -- Wide_Wide_Value -- | |
7132 | --------------------- | |
7133 | ||
d8f43ee6 | 7134 | when Attribute_Wide_Wide_Value => |
82c80734 RD |
7135 | Check_E1; |
7136 | Check_Scalar_Type; | |
7137 | ||
7138 | -- Set Etype before resolving expression because expansion | |
7139 | -- of expression may require enclosing type. | |
7140 | ||
7141 | Set_Etype (N, P_Type); | |
7142 | Validate_Non_Static_Attribute_Function_Call; | |
0688dac8 RD |
7143 | |
7144 | -- Check restriction No_Fixed_IO | |
7145 | ||
7146 | if Restriction_Check_Required (No_Fixed_IO) | |
7147 | and then Is_Fixed_Point_Type (P_Type) | |
7148 | then | |
7149 | Check_Restriction (No_Fixed_IO, P); | |
7150 | end if; | |
82c80734 RD |
7151 | |
7152 | --------------------- | |
7153 | -- Wide_Wide_Width -- | |
7154 | --------------------- | |
7155 | ||
7156 | when Attribute_Wide_Wide_Width => | |
7157 | Check_E0; | |
7158 | Check_Scalar_Type; | |
7159 | Set_Etype (N, Universal_Integer); | |
7160 | ||
996ae0b0 RK |
7161 | ---------------- |
7162 | -- Wide_Width -- | |
7163 | ---------------- | |
7164 | ||
7165 | when Attribute_Wide_Width => | |
ce5ba43a | 7166 | Check_SPARK_05_Restriction_On_Attribute; |
996ae0b0 RK |
7167 | Check_E0; |
7168 | Check_Scalar_Type; | |
7169 | Set_Etype (N, Universal_Integer); | |
7170 | ||
7171 | ----------- | |
7172 | -- Width -- | |
7173 | ----------- | |
7174 | ||
7175 | when Attribute_Width => | |
ce5ba43a | 7176 | Check_SPARK_05_Restriction_On_Attribute; |
996ae0b0 RK |
7177 | Check_E0; |
7178 | Check_Scalar_Type; | |
7179 | Set_Etype (N, Universal_Integer); | |
7180 | ||
7181 | --------------- | |
7182 | -- Word_Size -- | |
7183 | --------------- | |
7184 | ||
7185 | when Attribute_Word_Size => | |
7186 | Standard_Attribute (System_Word_Size); | |
7187 | ||
7188 | ----------- | |
7189 | -- Write -- | |
7190 | ----------- | |
7191 | ||
7192 | when Attribute_Write => | |
7193 | Check_E2; | |
fbf5a39b | 7194 | Check_Stream_Attribute (TSS_Stream_Write); |
996ae0b0 | 7195 | Set_Etype (N, Standard_Void_Type); |
996ae0b0 RK |
7196 | Resolve (N, Standard_Void_Type); |
7197 | ||
7198 | end case; | |
7199 | ||
e4d04166 AC |
7200 | -- In SPARK certain attributes (see below) depend on Tasking_State. |
7201 | -- Ensure that the entity is available for gnat2why by loading it. | |
7202 | -- See SPARK RM 9(18) for the relevant rule. | |
27bb7941 AC |
7203 | |
7204 | if GNATprove_Mode then | |
7205 | declare | |
7206 | Unused : Entity_Id; | |
e4d04166 | 7207 | |
27bb7941 AC |
7208 | begin |
7209 | case Attr_Id is | |
d8f43ee6 HK |
7210 | when Attribute_Callable |
7211 | | Attribute_Caller | |
7212 | | Attribute_Count | |
7213 | | Attribute_Terminated | |
7214 | => | |
27bb7941 AC |
7215 | Unused := RTE (RE_Tasking_State); |
7216 | ||
7217 | when others => | |
7218 | null; | |
7219 | end case; | |
7220 | end; | |
7221 | end if; | |
7222 | ||
996ae0b0 RK |
7223 | -- All errors raise Bad_Attribute, so that we get out before any further |
7224 | -- damage occurs when an error is detected (for example, if we check for | |
7225 | -- one attribute expression, and the check succeeds, we want to be able | |
7226 | -- to proceed securely assuming that an expression is in fact present. | |
7227 | ||
0da2c8ac AC |
7228 | -- Note: we set the attribute analyzed in this case to prevent any |
7229 | -- attempt at reanalysis which could generate spurious error msgs. | |
7230 | ||
996ae0b0 RK |
7231 | exception |
7232 | when Bad_Attribute => | |
0da2c8ac | 7233 | Set_Analyzed (N); |
996ae0b0 RK |
7234 | Set_Etype (N, Any_Type); |
7235 | return; | |
996ae0b0 RK |
7236 | end Analyze_Attribute; |
7237 | ||
7238 | -------------------- | |
7239 | -- Eval_Attribute -- | |
7240 | -------------------- | |
7241 | ||
7242 | procedure Eval_Attribute (N : Node_Id) is | |
7243 | Loc : constant Source_Ptr := Sloc (N); | |
7244 | Aname : constant Name_Id := Attribute_Name (N); | |
7245 | Id : constant Attribute_Id := Get_Attribute_Id (Aname); | |
7246 | P : constant Node_Id := Prefix (N); | |
7247 | ||
7248 | C_Type : constant Entity_Id := Etype (N); | |
edd63e9b | 7249 | -- The type imposed by the context |
996ae0b0 RK |
7250 | |
7251 | E1 : Node_Id; | |
7252 | -- First expression, or Empty if none | |
7253 | ||
7254 | E2 : Node_Id; | |
7255 | -- Second expression, or Empty if none | |
7256 | ||
7257 | P_Entity : Entity_Id; | |
7258 | -- Entity denoted by prefix | |
7259 | ||
7260 | P_Type : Entity_Id; | |
7261 | -- The type of the prefix | |
7262 | ||
7263 | P_Base_Type : Entity_Id; | |
7264 | -- The base type of the prefix type | |
7265 | ||
7266 | P_Root_Type : Entity_Id; | |
7267 | -- The root type of the prefix type | |
7268 | ||
1e3c434f | 7269 | Static : Boolean := False; |
fbf5a39b AC |
7270 | -- True if the result is Static. This is set by the general processing |
7271 | -- to true if the prefix is static, and all expressions are static. It | |
edab6088 RD |
7272 | -- can be reset as processing continues for particular attributes. This |
7273 | -- flag can still be True if the reference raises a constraint error. | |
7274 | -- Is_Static_Expression (N) is set to follow this value as it is set | |
7275 | -- and we could always reference this, but it is convenient to have a | |
7276 | -- simple short name to use, since it is frequently referenced. | |
996ae0b0 RK |
7277 | |
7278 | Lo_Bound, Hi_Bound : Node_Id; | |
7279 | -- Expressions for low and high bounds of type or array index referenced | |
7280 | -- by First, Last, or Length attribute for array, set by Set_Bounds. | |
7281 | ||
7282 | CE_Node : Node_Id; | |
7283 | -- Constraint error node used if we have an attribute reference has | |
7284 | -- an argument that raises a constraint error. In this case we replace | |
7285 | -- the attribute with a raise constraint_error node. This is important | |
7286 | -- processing, since otherwise gigi might see an attribute which it is | |
7287 | -- unprepared to deal with. | |
7288 | ||
5a153b27 AC |
7289 | procedure Check_Concurrent_Discriminant (Bound : Node_Id); |
7290 | -- If Bound is a reference to a discriminant of a task or protected type | |
7291 | -- occurring within the object's body, rewrite attribute reference into | |
7292 | -- a reference to the corresponding discriminal. Use for the expansion | |
7293 | -- of checks against bounds of entry family index subtypes. | |
7294 | ||
996ae0b0 RK |
7295 | procedure Check_Expressions; |
7296 | -- In case where the attribute is not foldable, the expressions, if | |
7297 | -- any, of the attribute, are in a non-static context. This procedure | |
7298 | -- performs the required additional checks. | |
7299 | ||
fbf5a39b AC |
7300 | function Compile_Time_Known_Bounds (Typ : Entity_Id) return Boolean; |
7301 | -- Determines if the given type has compile time known bounds. Note | |
7302 | -- that we enter the case statement even in cases where the prefix | |
7303 | -- type does NOT have known bounds, so it is important to guard any | |
7304 | -- attempt to evaluate both bounds with a call to this function. | |
7305 | ||
32213142 RD |
7306 | procedure Compile_Time_Known_Attribute (N : Node_Id; Val : Uint); |
7307 | -- This procedure is called when the attribute N has a non-static | |
7308 | -- but compile time known value given by Val. It includes the | |
7309 | -- necessary checks for out of range values. | |
7310 | ||
996ae0b0 RK |
7311 | function Fore_Value return Nat; |
7312 | -- Computes the Fore value for the current attribute prefix, which is | |
7313 | -- known to be a static fixed-point type. Used by Fore and Width. | |
7314 | ||
7315 | function Mantissa return Uint; | |
7316 | -- Returns the Mantissa value for the prefix type | |
7317 | ||
7318 | procedure Set_Bounds; | |
7319 | -- Used for First, Last and Length attributes applied to an array or | |
fbf5a39b | 7320 | -- array subtype. Sets the variables Lo_Bound and Hi_Bound to the low |
996ae0b0 | 7321 | -- and high bound expressions for the index referenced by the attribute |
011f9d5d AC |
7322 | -- designator (i.e. the first index if no expression is present, and the |
7323 | -- N'th index if the value N is present as an expression). Also used for | |
7324 | -- First and Last of scalar types and for First_Valid and Last_Valid. | |
7325 | -- Static is reset to False if the type or index type is not statically | |
7326 | -- constrained. | |
996ae0b0 | 7327 | |
c4e5e10f TQ |
7328 | function Statically_Denotes_Entity (N : Node_Id) return Boolean; |
7329 | -- Verify that the prefix of a potentially static array attribute | |
7330 | -- satisfies the conditions of 4.9 (14). | |
7331 | ||
5a153b27 AC |
7332 | ----------------------------------- |
7333 | -- Check_Concurrent_Discriminant -- | |
7334 | ----------------------------------- | |
7335 | ||
7336 | procedure Check_Concurrent_Discriminant (Bound : Node_Id) is | |
6ca9ec9c | 7337 | Tsk : Entity_Id; |
5a153b27 | 7338 | -- The concurrent (task or protected) type |
6ca9ec9c | 7339 | |
5a153b27 AC |
7340 | begin |
7341 | if Nkind (Bound) = N_Identifier | |
7342 | and then Ekind (Entity (Bound)) = E_Discriminant | |
7343 | and then Is_Concurrent_Record_Type (Scope (Entity (Bound))) | |
7344 | then | |
7345 | Tsk := Corresponding_Concurrent_Type (Scope (Entity (Bound))); | |
6ca9ec9c AC |
7346 | |
7347 | if In_Open_Scopes (Tsk) and then Has_Completion (Tsk) then | |
7348 | ||
5a153b27 AC |
7349 | -- Find discriminant of original concurrent type, and use |
7350 | -- its current discriminal, which is the renaming within | |
7351 | -- the task/protected body. | |
7352 | ||
7353 | Rewrite (N, | |
7354 | New_Occurrence_Of | |
7355 | (Find_Body_Discriminal (Entity (Bound)), Loc)); | |
7356 | end if; | |
7357 | end if; | |
7358 | end Check_Concurrent_Discriminant; | |
7359 | ||
996ae0b0 RK |
7360 | ----------------------- |
7361 | -- Check_Expressions -- | |
7362 | ----------------------- | |
7363 | ||
7364 | procedure Check_Expressions is | |
442ade9d | 7365 | E : Node_Id; |
996ae0b0 | 7366 | begin |
442ade9d | 7367 | E := E1; |
996ae0b0 RK |
7368 | while Present (E) loop |
7369 | Check_Non_Static_Context (E); | |
7370 | Next (E); | |
7371 | end loop; | |
7372 | end Check_Expressions; | |
7373 | ||
32213142 RD |
7374 | ---------------------------------- |
7375 | -- Compile_Time_Known_Attribute -- | |
7376 | ---------------------------------- | |
7377 | ||
7378 | procedure Compile_Time_Known_Attribute (N : Node_Id; Val : Uint) is | |
7379 | T : constant Entity_Id := Etype (N); | |
7380 | ||
7381 | begin | |
fbf5a39b | 7382 | Fold_Uint (N, Val, False); |
32213142 RD |
7383 | |
7384 | -- Check that result is in bounds of the type if it is static | |
7385 | ||
c800f862 | 7386 | if Is_In_Range (N, T, Assume_Valid => False) then |
32213142 RD |
7387 | null; |
7388 | ||
7389 | elsif Is_Out_Of_Range (N, T) then | |
7390 | Apply_Compile_Time_Constraint_Error | |
324ac540 | 7391 | (N, "value not in range of}??", CE_Range_Check_Failed); |
32213142 RD |
7392 | |
7393 | elsif not Range_Checks_Suppressed (T) then | |
7394 | Enable_Range_Check (N); | |
7395 | ||
7396 | else | |
7397 | Set_Do_Range_Check (N, False); | |
7398 | end if; | |
7399 | end Compile_Time_Known_Attribute; | |
7400 | ||
fbf5a39b AC |
7401 | ------------------------------- |
7402 | -- Compile_Time_Known_Bounds -- | |
7403 | ------------------------------- | |
7404 | ||
7405 | function Compile_Time_Known_Bounds (Typ : Entity_Id) return Boolean is | |
7406 | begin | |
7407 | return | |
7408 | Compile_Time_Known_Value (Type_Low_Bound (Typ)) | |
7409 | and then | |
7410 | Compile_Time_Known_Value (Type_High_Bound (Typ)); | |
7411 | end Compile_Time_Known_Bounds; | |
7412 | ||
996ae0b0 RK |
7413 | ---------------- |
7414 | -- Fore_Value -- | |
7415 | ---------------- | |
7416 | ||
7417 | -- Note that the Fore calculation is based on the actual values | |
7418 | -- of the bounds, and does not take into account possible rounding. | |
7419 | ||
7420 | function Fore_Value return Nat is | |
7421 | Lo : constant Uint := Expr_Value (Type_Low_Bound (P_Type)); | |
7422 | Hi : constant Uint := Expr_Value (Type_High_Bound (P_Type)); | |
7423 | Small : constant Ureal := Small_Value (P_Type); | |
7424 | Lo_Real : constant Ureal := Lo * Small; | |
7425 | Hi_Real : constant Ureal := Hi * Small; | |
7426 | T : Ureal; | |
7427 | R : Nat; | |
7428 | ||
7429 | begin | |
7430 | -- Bounds are given in terms of small units, so first compute | |
7431 | -- proper values as reals. | |
7432 | ||
7433 | T := UR_Max (abs Lo_Real, abs Hi_Real); | |
7434 | R := 2; | |
7435 | ||
7436 | -- Loop to compute proper value if more than one digit required | |
7437 | ||
7438 | while T >= Ureal_10 loop | |
7439 | R := R + 1; | |
7440 | T := T / Ureal_10; | |
7441 | end loop; | |
7442 | ||
7443 | return R; | |
7444 | end Fore_Value; | |
7445 | ||
7446 | -------------- | |
7447 | -- Mantissa -- | |
7448 | -------------- | |
7449 | ||
7450 | -- Table of mantissa values accessed by function Computed using | |
7451 | -- the relation: | |
7452 | ||
7453 | -- T'Mantissa = integer next above (D * log(10)/log(2)) + 1) | |
7454 | ||
7455 | -- where D is T'Digits (RM83 3.5.7) | |
7456 | ||
7457 | Mantissa_Value : constant array (Nat range 1 .. 40) of Nat := ( | |
7458 | 1 => 5, | |
7459 | 2 => 8, | |
7460 | 3 => 11, | |
7461 | 4 => 15, | |
7462 | 5 => 18, | |
7463 | 6 => 21, | |
7464 | 7 => 25, | |
7465 | 8 => 28, | |
7466 | 9 => 31, | |
7467 | 10 => 35, | |
7468 | 11 => 38, | |
7469 | 12 => 41, | |
7470 | 13 => 45, | |
7471 | 14 => 48, | |
7472 | 15 => 51, | |
7473 | 16 => 55, | |
7474 | 17 => 58, | |
7475 | 18 => 61, | |
7476 | 19 => 65, | |
7477 | 20 => 68, | |
7478 | 21 => 71, | |
7479 | 22 => 75, | |
7480 | 23 => 78, | |
7481 | 24 => 81, | |
7482 | 25 => 85, | |
7483 | 26 => 88, | |
7484 | 27 => 91, | |
7485 | 28 => 95, | |
7486 | 29 => 98, | |
7487 | 30 => 101, | |
7488 | 31 => 104, | |
7489 | 32 => 108, | |
7490 | 33 => 111, | |
7491 | 34 => 114, | |
7492 | 35 => 118, | |
7493 | 36 => 121, | |
7494 | 37 => 124, | |
7495 | 38 => 128, | |
7496 | 39 => 131, | |
7497 | 40 => 134); | |
7498 | ||
7499 | function Mantissa return Uint is | |
7500 | begin | |
7501 | return | |
7502 | UI_From_Int (Mantissa_Value (UI_To_Int (Digits_Value (P_Type)))); | |
7503 | end Mantissa; | |
7504 | ||
7505 | ---------------- | |
7506 | -- Set_Bounds -- | |
7507 | ---------------- | |
7508 | ||
7509 | procedure Set_Bounds is | |
7510 | Ndim : Nat; | |
7511 | Indx : Node_Id; | |
7512 | Ityp : Entity_Id; | |
7513 | ||
7514 | begin | |
7515 | -- For a string literal subtype, we have to construct the bounds. | |
7516 | -- Valid Ada code never applies attributes to string literals, but | |
7517 | -- it is convenient to allow the expander to generate attribute | |
7518 | -- references of this type (e.g. First and Last applied to a string | |
7519 | -- literal). | |
7520 | ||
7521 | -- Note that the whole point of the E_String_Literal_Subtype is to | |
7522 | -- avoid this construction of bounds, but the cases in which we | |
a90bd866 | 7523 | -- have to materialize them are rare enough that we don't worry. |
996ae0b0 RK |
7524 | |
7525 | -- The low bound is simply the low bound of the base type. The | |
7526 | -- high bound is computed from the length of the string and this | |
7527 | -- low bound. | |
7528 | ||
7529 | if Ekind (P_Type) = E_String_Literal_Subtype then | |
fbf5a39b AC |
7530 | Ityp := Etype (First_Index (Base_Type (P_Type))); |
7531 | Lo_Bound := Type_Low_Bound (Ityp); | |
996ae0b0 RK |
7532 | |
7533 | Hi_Bound := | |
7534 | Make_Integer_Literal (Sloc (P), | |
7535 | Intval => | |
7536 | Expr_Value (Lo_Bound) + String_Literal_Length (P_Type) - 1); | |
7537 | ||
7538 | Set_Parent (Hi_Bound, P); | |
7539 | Analyze_And_Resolve (Hi_Bound, Etype (Lo_Bound)); | |
7540 | return; | |
7541 | ||
7542 | -- For non-array case, just get bounds of scalar type | |
7543 | ||
7544 | elsif Is_Scalar_Type (P_Type) then | |
7545 | Ityp := P_Type; | |
7546 | ||
fbf5a39b AC |
7547 | -- For a fixed-point type, we must freeze to get the attributes |
7548 | -- of the fixed-point type set now so we can reference them. | |
7549 | ||
7fb754a1 GB |
7550 | if Is_Fixed_Point_Type (P_Type) |
7551 | and then not Is_Frozen (Base_Type (P_Type)) | |
7552 | and then Compile_Time_Known_Value (Type_Low_Bound (P_Type)) | |
7553 | and then Compile_Time_Known_Value (Type_High_Bound (P_Type)) | |
7554 | then | |
7555 | Freeze_Fixed_Point_Type (Base_Type (P_Type)); | |
7556 | end if; | |
7557 | ||
996ae0b0 RK |
7558 | -- For array case, get type of proper index |
7559 | ||
7560 | else | |
7561 | if No (E1) then | |
7562 | Ndim := 1; | |
7563 | else | |
7564 | Ndim := UI_To_Int (Expr_Value (E1)); | |
7565 | end if; | |
7566 | ||
7567 | Indx := First_Index (P_Type); | |
7568 | for J in 1 .. Ndim - 1 loop | |
7569 | Next_Index (Indx); | |
7570 | end loop; | |
7571 | ||
7572 | -- If no index type, get out (some other error occurred, and | |
a90bd866 | 7573 | -- we don't have enough information to complete the job). |
996ae0b0 RK |
7574 | |
7575 | if No (Indx) then | |
7576 | Lo_Bound := Error; | |
7577 | Hi_Bound := Error; | |
7578 | return; | |
7579 | end if; | |
7580 | ||
7581 | Ityp := Etype (Indx); | |
7582 | end if; | |
7583 | ||
7584 | -- A discrete range in an index constraint is allowed to be a | |
7585 | -- subtype indication. This is syntactically a pain, but should | |
7586 | -- not propagate to the entity for the corresponding index subtype. | |
7587 | -- After checking that the subtype indication is legal, the range | |
7588 | -- of the subtype indication should be transfered to the entity. | |
7589 | -- The attributes for the bounds should remain the simple retrievals | |
7590 | -- that they are now. | |
7591 | ||
7592 | Lo_Bound := Type_Low_Bound (Ityp); | |
7593 | Hi_Bound := Type_High_Bound (Ityp); | |
7594 | ||
edab6088 RD |
7595 | -- If subtype is non-static, result is definitely non-static |
7596 | ||
fbf5a39b AC |
7597 | if not Is_Static_Subtype (Ityp) then |
7598 | Static := False; | |
edab6088 RD |
7599 | Set_Is_Static_Expression (N, False); |
7600 | ||
7601 | -- Subtype is static, does it raise CE? | |
7602 | ||
7603 | elsif not Is_OK_Static_Subtype (Ityp) then | |
7604 | Set_Raises_Constraint_Error (N); | |
fbf5a39b | 7605 | end if; |
996ae0b0 RK |
7606 | end Set_Bounds; |
7607 | ||
c4e5e10f TQ |
7608 | ------------------------------- |
7609 | -- Statically_Denotes_Entity -- | |
7610 | ------------------------------- | |
7611 | ||
7612 | function Statically_Denotes_Entity (N : Node_Id) return Boolean is | |
7613 | E : Entity_Id; | |
7614 | ||
7615 | begin | |
7616 | if not Is_Entity_Name (N) then | |
7617 | return False; | |
7618 | else | |
7619 | E := Entity (N); | |
7620 | end if; | |
7621 | ||
7622 | return | |
7623 | Nkind (Parent (E)) /= N_Object_Renaming_Declaration | |
7624 | or else Statically_Denotes_Entity (Renamed_Object (E)); | |
7625 | end Statically_Denotes_Entity; | |
7626 | ||
996ae0b0 RK |
7627 | -- Start of processing for Eval_Attribute |
7628 | ||
7629 | begin | |
1e3c434f BD |
7630 | -- The To_Address attribute can be static, but it cannot be evaluated at |
7631 | -- compile time, so just return. | |
7632 | ||
7633 | if Id = Attribute_To_Address then | |
7634 | return; | |
7635 | end if; | |
7636 | ||
edab6088 RD |
7637 | -- Initialize result as non-static, will be reset if appropriate |
7638 | ||
7639 | Set_Is_Static_Expression (N, False); | |
edab6088 | 7640 | |
c159409f AC |
7641 | -- Acquire first two expressions (at the moment, no attributes take more |
7642 | -- than two expressions in any case). | |
996ae0b0 RK |
7643 | |
7644 | if Present (Expressions (N)) then | |
7645 | E1 := First (Expressions (N)); | |
7646 | E2 := Next (E1); | |
7647 | else | |
7648 | E1 := Empty; | |
7649 | E2 := Empty; | |
7650 | end if; | |
7651 | ||
442ade9d RD |
7652 | -- Special processing for Enabled attribute. This attribute has a very |
7653 | -- special prefix, and the easiest way to avoid lots of special checks | |
7654 | -- to protect this special prefix from causing trouble is to deal with | |
7655 | -- this attribute immediately and be done with it. | |
7656 | ||
7657 | if Id = Attribute_Enabled then | |
7658 | ||
442ade9d RD |
7659 | -- We skip evaluation if the expander is not active. This is not just |
7660 | -- an optimization. It is of key importance that we not rewrite the | |
7661 | -- attribute in a generic template, since we want to pick up the | |
774454ac AC |
7662 | -- setting of the check in the instance, Testing Expander_Active |
7663 | -- might seem an easy way of doing this, but we need to account for | |
7664 | -- ASIS needs, so check explicitly for a generic context. | |
442ade9d | 7665 | |
774454ac | 7666 | if not Inside_A_Generic then |
442ade9d RD |
7667 | declare |
7668 | C : constant Check_Id := Get_Check_Id (Chars (P)); | |
7669 | R : Boolean; | |
7670 | ||
7671 | begin | |
7672 | if No (E1) then | |
7673 | if C in Predefined_Check_Id then | |
3217f71e | 7674 | R := Scope_Suppress.Suppress (C); |
442ade9d RD |
7675 | else |
7676 | R := Is_Check_Suppressed (Empty, C); | |
7677 | end if; | |
7678 | ||
7679 | else | |
7680 | R := Is_Check_Suppressed (Entity (E1), C); | |
7681 | end if; | |
7682 | ||
21791d97 | 7683 | Rewrite (N, New_Occurrence_Of (Boolean_Literals (not R), Loc)); |
442ade9d RD |
7684 | end; |
7685 | end if; | |
7686 | ||
7687 | return; | |
7688 | end if; | |
7689 | ||
21db8699 RD |
7690 | -- Attribute 'Img applied to a static enumeration value is static, and |
7691 | -- we will do the folding right here (things get confused if we let this | |
7692 | -- case go through the normal circuitry). | |
7693 | ||
7694 | if Attribute_Name (N) = Name_Img | |
7695 | and then Is_Entity_Name (P) | |
7696 | and then Is_Enumeration_Type (Etype (Entity (P))) | |
7697 | and then Is_OK_Static_Expression (P) | |
7698 | then | |
7699 | declare | |
7700 | Lit : constant Entity_Id := Expr_Value_E (P); | |
7701 | Str : String_Id; | |
7702 | ||
7703 | begin | |
7704 | Start_String; | |
7705 | Get_Unqualified_Decoded_Name_String (Chars (Lit)); | |
7706 | Set_Casing (All_Upper_Case); | |
7707 | Store_String_Chars (Name_Buffer (1 .. Name_Len)); | |
7708 | Str := End_String; | |
7709 | ||
7710 | Rewrite (N, Make_String_Literal (Loc, Strval => Str)); | |
7711 | Analyze_And_Resolve (N, Standard_String); | |
7712 | Set_Is_Static_Expression (N, True); | |
7713 | end; | |
7714 | ||
7715 | return; | |
7716 | end if; | |
7717 | ||
ca7e6c26 AC |
7718 | -- Special processing for cases where the prefix is an object. For this |
7719 | -- purpose, a string literal counts as an object (attributes of string | |
7720 | -- literals can only appear in generated code). | |
996ae0b0 | 7721 | |
fbf5a39b | 7722 | if Is_Object_Reference (P) or else Nkind (P) = N_String_Literal then |
996ae0b0 RK |
7723 | |
7724 | -- For Component_Size, the prefix is an array object, and we apply | |
ca7e6c26 AC |
7725 | -- the attribute to the type of the object. This is allowed for both |
7726 | -- unconstrained and constrained arrays, since the bounds have no | |
7727 | -- influence on the value of this attribute. | |
996ae0b0 RK |
7728 | |
7729 | if Id = Attribute_Component_Size then | |
7730 | P_Entity := Etype (P); | |
7731 | ||
ca7e6c26 AC |
7732 | -- For Enum_Rep, evaluation depends on the nature of the prefix and |
7733 | -- the optional argument. | |
7734 | ||
7735 | elsif Id = Attribute_Enum_Rep then | |
7736 | if Is_Entity_Name (P) then | |
7737 | ||
f3e0f7c3 BD |
7738 | declare |
7739 | Enum_Expr : Node_Id; | |
7740 | -- The enumeration-type expression of interest | |
0c3f76ba | 7741 | |
f3e0f7c3 BD |
7742 | begin |
7743 | -- P'Enum_Rep case | |
ca7e6c26 | 7744 | |
0c3f76ba AC |
7745 | if Ekind_In (Entity (P), E_Constant, |
7746 | E_Enumeration_Literal) | |
f3e0f7c3 BD |
7747 | then |
7748 | Enum_Expr := P; | |
ca7e6c26 | 7749 | |
f3e0f7c3 | 7750 | -- Enum_Type'Enum_Rep (E1) case |
ca7e6c26 | 7751 | |
f3e0f7c3 BD |
7752 | elsif Is_Enumeration_Type (Entity (P)) then |
7753 | Enum_Expr := E1; | |
ca7e6c26 | 7754 | |
f3e0f7c3 BD |
7755 | -- Otherwise the attribute must be expanded into a |
7756 | -- conversion and evaluated at run time. | |
ca7e6c26 | 7757 | |
f3e0f7c3 BD |
7758 | else |
7759 | Check_Expressions; | |
7760 | return; | |
7761 | end if; | |
7762 | ||
7763 | -- We can fold if the expression is an enumeration | |
0c3f76ba AC |
7764 | -- literal, or if it denotes a constant whose value |
7765 | -- is known at compile time. | |
f3e0f7c3 BD |
7766 | |
7767 | if Nkind (Enum_Expr) in N_Has_Entity | |
7768 | and then (Ekind (Entity (Enum_Expr)) = | |
7769 | E_Enumeration_Literal | |
7770 | or else | |
7771 | (Ekind (Entity (Enum_Expr)) = E_Constant | |
7772 | and then Nkind (Parent (Entity (Enum_Expr))) = | |
7773 | N_Object_Declaration | |
0c3f76ba | 7774 | and then Compile_Time_Known_Value |
f3e0f7c3 BD |
7775 | (Expression (Parent (Entity (P)))))) |
7776 | then | |
7777 | P_Entity := Etype (P); | |
7778 | else | |
7779 | Check_Expressions; | |
7780 | return; | |
7781 | end if; | |
7782 | end; | |
ca7e6c26 AC |
7783 | |
7784 | -- Otherwise the attribute is illegal, do not attempt to perform | |
7785 | -- any kind of folding. | |
7786 | ||
7787 | else | |
7788 | return; | |
7789 | end if; | |
7790 | ||
996ae0b0 RK |
7791 | -- For First and Last, the prefix is an array object, and we apply |
7792 | -- the attribute to the type of the array, but we need a constrained | |
7793 | -- type for this, so we use the actual subtype if available. | |
7794 | ||
edab6088 RD |
7795 | elsif Id = Attribute_First or else |
7796 | Id = Attribute_Last or else | |
996ae0b0 RK |
7797 | Id = Attribute_Length |
7798 | then | |
7799 | declare | |
7800 | AS : constant Entity_Id := Get_Actual_Subtype_If_Available (P); | |
7801 | ||
7802 | begin | |
fbf5a39b | 7803 | if Present (AS) and then Is_Constrained (AS) then |
996ae0b0 RK |
7804 | P_Entity := AS; |
7805 | ||
df46b832 | 7806 | -- If we have an unconstrained type we cannot fold |
996ae0b0 RK |
7807 | |
7808 | else | |
7809 | Check_Expressions; | |
7810 | return; | |
7811 | end if; | |
7812 | end; | |
7813 | ||
7814 | -- For Size, give size of object if available, otherwise we | |
7815 | -- cannot fold Size. | |
7816 | ||
7817 | elsif Id = Attribute_Size then | |
996ae0b0 RK |
7818 | if Is_Entity_Name (P) |
7819 | and then Known_Esize (Entity (P)) | |
7820 | then | |
32213142 | 7821 | Compile_Time_Known_Attribute (N, Esize (Entity (P))); |
996ae0b0 RK |
7822 | return; |
7823 | ||
7824 | else | |
7825 | Check_Expressions; | |
7826 | return; | |
7827 | end if; | |
7828 | ||
7829 | -- For Alignment, give size of object if available, otherwise we | |
7830 | -- cannot fold Alignment. | |
7831 | ||
7832 | elsif Id = Attribute_Alignment then | |
996ae0b0 RK |
7833 | if Is_Entity_Name (P) |
7834 | and then Known_Alignment (Entity (P)) | |
7835 | then | |
edab6088 | 7836 | Fold_Uint (N, Alignment (Entity (P)), Static); |
996ae0b0 RK |
7837 | return; |
7838 | ||
7839 | else | |
7840 | Check_Expressions; | |
7841 | return; | |
7842 | end if; | |
7843 | ||
0ebc109a VP |
7844 | -- For Lock_Free, we apply the attribute to the type of the object. |
7845 | -- This is allowed since we have already verified that the type is a | |
7846 | -- protected type. | |
7847 | ||
7848 | elsif Id = Attribute_Lock_Free then | |
7849 | P_Entity := Etype (P); | |
7850 | ||
996ae0b0 RK |
7851 | -- No other attributes for objects are folded |
7852 | ||
7853 | else | |
7854 | Check_Expressions; | |
7855 | return; | |
7856 | end if; | |
7857 | ||
f7ea2603 RD |
7858 | -- Cases where P is not an object. Cannot do anything if P is not the |
7859 | -- name of an entity. | |
996ae0b0 RK |
7860 | |
7861 | elsif not Is_Entity_Name (P) then | |
7862 | Check_Expressions; | |
7863 | return; | |
7864 | ||
7865 | -- Otherwise get prefix entity | |
7866 | ||
7867 | else | |
7868 | P_Entity := Entity (P); | |
7869 | end if; | |
7870 | ||
edab6088 RD |
7871 | -- If we are asked to evaluate an attribute where the prefix is a |
7872 | -- non-frozen generic actual type whose RM_Size is still set to zero, | |
4bd4bb7f | 7873 | -- then abandon the effort. |
edab6088 RD |
7874 | |
7875 | if Is_Type (P_Entity) | |
7876 | and then (not Is_Frozen (P_Entity) | |
7877 | and then Is_Generic_Actual_Type (P_Entity) | |
7878 | and then RM_Size (P_Entity) = 0) | |
4bd4bb7f AC |
7879 | |
7880 | -- However, the attribute Unconstrained_Array must be evaluated, | |
7881 | -- since it is documented to be a static attribute (and can for | |
7882 | -- example appear in a Compile_Time_Warning pragma). The frozen | |
7883 | -- status of the type does not affect its evaluation. | |
7884 | ||
7885 | and then Id /= Attribute_Unconstrained_Array | |
edab6088 RD |
7886 | then |
7887 | return; | |
7888 | end if; | |
7889 | ||
996ae0b0 RK |
7890 | -- At this stage P_Entity is the entity to which the attribute |
7891 | -- is to be applied. This is usually simply the entity of the | |
7892 | -- prefix, except in some cases of attributes for objects, where | |
7893 | -- as described above, we apply the attribute to the object type. | |
7894 | ||
edab6088 RD |
7895 | -- Here is where we make sure that static attributes are properly |
7896 | -- marked as such. These are attributes whose prefix is a static | |
7897 | -- scalar subtype, whose result is scalar, and whose arguments, if | |
7898 | -- present, are static scalar expressions. Note that such references | |
7899 | -- are static expressions even if they raise Constraint_Error. | |
7900 | ||
7901 | -- For example, Boolean'Pos (1/0 = 0) is a static expression, even | |
7902 | -- though evaluating it raises constraint error. This means that a | |
7903 | -- declaration like: | |
7904 | ||
7905 | -- X : constant := (if True then 1 else Boolean'Pos (1/0 = 0)); | |
7906 | ||
7907 | -- is legal, since here this expression appears in a statically | |
7908 | -- unevaluated position, so it does not actually raise an exception. | |
5d3983bc BD |
7909 | -- |
7910 | -- T'Descriptor_Size is never static, even if T is static. | |
edab6088 RD |
7911 | |
7912 | if Is_Scalar_Type (P_Entity) | |
7913 | and then (not Is_Generic_Type (P_Entity)) | |
7914 | and then Is_Static_Subtype (P_Entity) | |
7915 | and then Is_Scalar_Type (Etype (N)) | |
7916 | and then | |
7917 | (No (E1) | |
7918 | or else (Is_Static_Expression (E1) | |
7919 | and then Is_Scalar_Type (Etype (E1)))) | |
7920 | and then | |
7921 | (No (E2) | |
7922 | or else (Is_Static_Expression (E2) | |
7923 | and then Is_Scalar_Type (Etype (E1)))) | |
5d3983bc | 7924 | and then Id /= Attribute_Descriptor_Size |
edab6088 RD |
7925 | then |
7926 | Static := True; | |
7927 | Set_Is_Static_Expression (N, True); | |
7928 | end if; | |
7929 | ||
996ae0b0 RK |
7930 | -- First foldable possibility is a scalar or array type (RM 4.9(7)) |
7931 | -- that is not generic (generic types are eliminated by RM 4.9(25)). | |
7932 | -- Note we allow non-static non-generic types at this stage as further | |
7933 | -- described below. | |
7934 | ||
7935 | if Is_Type (P_Entity) | |
7936 | and then (Is_Scalar_Type (P_Entity) or Is_Array_Type (P_Entity)) | |
7937 | and then (not Is_Generic_Type (P_Entity)) | |
7938 | then | |
7939 | P_Type := P_Entity; | |
7940 | ||
7941 | -- Second foldable possibility is an array object (RM 4.9(8)) | |
7942 | ||
21db8699 | 7943 | elsif Ekind_In (P_Entity, E_Variable, E_Constant) |
996ae0b0 RK |
7944 | and then Is_Array_Type (Etype (P_Entity)) |
7945 | and then (not Is_Generic_Type (Etype (P_Entity))) | |
7946 | then | |
7947 | P_Type := Etype (P_Entity); | |
7948 | ||
b8dc622e JM |
7949 | -- If the entity is an array constant with an unconstrained nominal |
7950 | -- subtype then get the type from the initial value. If the value has | |
7951 | -- been expanded into assignments, there is no expression and the | |
7952 | -- attribute reference remains dynamic. | |
4c4e9ad2 | 7953 | |
996ae0b0 RK |
7954 | -- We could do better here and retrieve the type ??? |
7955 | ||
7956 | if Ekind (P_Entity) = E_Constant | |
7957 | and then not Is_Constrained (P_Type) | |
7958 | then | |
7959 | if No (Constant_Value (P_Entity)) then | |
7960 | return; | |
7961 | else | |
7962 | P_Type := Etype (Constant_Value (P_Entity)); | |
7963 | end if; | |
7964 | end if; | |
7965 | ||
edab6088 RD |
7966 | -- Definite must be folded if the prefix is not a generic type, that |
7967 | -- is to say if we are within an instantiation. Same processing applies | |
7968 | -- to the GNAT attributes Atomic_Always_Lock_Free, Has_Discriminants, | |
7969 | -- Lock_Free, Type_Class, Has_Tagged_Value, and Unconstrained_Array. | |
996ae0b0 | 7970 | |
edab6088 RD |
7971 | elsif (Id = Attribute_Atomic_Always_Lock_Free or else |
7972 | Id = Attribute_Definite or else | |
7973 | Id = Attribute_Has_Access_Values or else | |
7974 | Id = Attribute_Has_Discriminants or else | |
7975 | Id = Attribute_Has_Tagged_Values or else | |
7976 | Id = Attribute_Lock_Free or else | |
7977 | Id = Attribute_Type_Class or else | |
7978 | Id = Attribute_Unconstrained_Array or else | |
4adf3c50 | 7979 | Id = Attribute_Max_Alignment_For_Allocation) |
996ae0b0 RK |
7980 | and then not Is_Generic_Type (P_Entity) |
7981 | then | |
7982 | P_Type := P_Entity; | |
7983 | ||
e10dab7f JM |
7984 | -- We can fold 'Size applied to a type if the size is known (as happens |
7985 | -- for a size from an attribute definition clause). At this stage, this | |
7986 | -- can happen only for types (e.g. record types) for which the size is | |
7987 | -- always non-static. We exclude generic types from consideration (since | |
7988 | -- they have bogus sizes set within templates). | |
996ae0b0 RK |
7989 | |
7990 | elsif Id = Attribute_Size | |
7991 | and then Is_Type (P_Entity) | |
7992 | and then (not Is_Generic_Type (P_Entity)) | |
7993 | and then Known_Static_RM_Size (P_Entity) | |
7994 | then | |
32213142 | 7995 | Compile_Time_Known_Attribute (N, RM_Size (P_Entity)); |
996ae0b0 RK |
7996 | return; |
7997 | ||
fbf5a39b AC |
7998 | -- We can fold 'Alignment applied to a type if the alignment is known |
7999 | -- (as happens for an alignment from an attribute definition clause). | |
f7ea2603 RD |
8000 | -- At this stage, this can happen only for types (e.g. record types) for |
8001 | -- which the size is always non-static. We exclude generic types from | |
8002 | -- consideration (since they have bogus sizes set within templates). | |
fbf5a39b AC |
8003 | |
8004 | elsif Id = Attribute_Alignment | |
8005 | and then Is_Type (P_Entity) | |
8006 | and then (not Is_Generic_Type (P_Entity)) | |
8007 | and then Known_Alignment (P_Entity) | |
8008 | then | |
8009 | Compile_Time_Known_Attribute (N, Alignment (P_Entity)); | |
8010 | return; | |
8011 | ||
acd47d2a AC |
8012 | -- If this is an access attribute that is known to fail accessibility |
8013 | -- check, rewrite accordingly. | |
8014 | ||
8015 | elsif Attribute_Name (N) = Name_Access | |
8016 | and then Raises_Constraint_Error (N) | |
8017 | then | |
8018 | Rewrite (N, | |
c01a9391 AC |
8019 | Make_Raise_Program_Error (Loc, |
8020 | Reason => PE_Accessibility_Check_Failed)); | |
acd47d2a AC |
8021 | Set_Etype (N, C_Type); |
8022 | return; | |
8023 | ||
996ae0b0 | 8024 | -- No other cases are foldable (they certainly aren't static, and at |
2a1f6a1f | 8025 | -- the moment we don't try to fold any cases other than the ones above). |
996ae0b0 RK |
8026 | |
8027 | else | |
8028 | Check_Expressions; | |
8029 | return; | |
8030 | end if; | |
8031 | ||
8032 | -- If either attribute or the prefix is Any_Type, then propagate | |
8033 | -- Any_Type to the result and don't do anything else at all. | |
8034 | ||
8035 | if P_Type = Any_Type | |
8036 | or else (Present (E1) and then Etype (E1) = Any_Type) | |
8037 | or else (Present (E2) and then Etype (E2) = Any_Type) | |
8038 | then | |
8039 | Set_Etype (N, Any_Type); | |
8040 | return; | |
8041 | end if; | |
8042 | ||
8043 | -- Scalar subtype case. We have not yet enforced the static requirement | |
8044 | -- of (RM 4.9(7)) and we don't intend to just yet, since there are cases | |
8045 | -- of non-static attribute references (e.g. S'Digits for a non-static | |
8046 | -- floating-point type, which we can compute at compile time). | |
8047 | ||
8048 | -- Note: this folding of non-static attributes is not simply a case of | |
8049 | -- optimization. For many of the attributes affected, Gigi cannot handle | |
8050 | -- the attribute and depends on the front end having folded them away. | |
8051 | ||
8052 | -- Note: although we don't require staticness at this stage, we do set | |
8053 | -- the Static variable to record the staticness, for easy reference by | |
8054 | -- those attributes where it matters (e.g. Succ and Pred), and also to | |
8055 | -- be used to ensure that non-static folded things are not marked as | |
8056 | -- being static (a check that is done right at the end). | |
8057 | ||
8058 | P_Root_Type := Root_Type (P_Type); | |
8059 | P_Base_Type := Base_Type (P_Type); | |
8060 | ||
8061 | -- If the root type or base type is generic, then we cannot fold. This | |
8062 | -- test is needed because subtypes of generic types are not always | |
8063 | -- marked as being generic themselves (which seems odd???) | |
8064 | ||
8065 | if Is_Generic_Type (P_Root_Type) | |
8066 | or else Is_Generic_Type (P_Base_Type) | |
8067 | then | |
8068 | return; | |
8069 | end if; | |
8070 | ||
8071 | if Is_Scalar_Type (P_Type) then | |
edab6088 RD |
8072 | if not Is_Static_Subtype (P_Type) then |
8073 | Static := False; | |
8074 | Set_Is_Static_Expression (N, False); | |
8075 | elsif not Is_OK_Static_Subtype (P_Type) then | |
8076 | Set_Raises_Constraint_Error (N); | |
8077 | end if; | |
996ae0b0 RK |
8078 | |
8079 | -- Array case. We enforce the constrained requirement of (RM 4.9(7-8)) | |
8080 | -- since we can't do anything with unconstrained arrays. In addition, | |
8081 | -- only the First, Last and Length attributes are possibly static. | |
996ae0b0 | 8082 | |
0ebc109a VP |
8083 | -- Atomic_Always_Lock_Free, Definite, Has_Access_Values, |
8084 | -- Has_Discriminants, Has_Tagged_Values, Lock_Free, Type_Class, and | |
8085 | -- Unconstrained_Array are again exceptions, because they apply as well | |
8086 | -- to unconstrained types. | |
996ae0b0 | 8087 | |
c4e5e10f TQ |
8088 | -- In addition Component_Size is an exception since it is possibly |
8089 | -- foldable, even though it is never static, and it does apply to | |
8090 | -- unconstrained arrays. Furthermore, it is essential to fold this | |
8091 | -- in the packed case, since otherwise the value will be incorrect. | |
8092 | ||
edab6088 RD |
8093 | elsif Id = Attribute_Atomic_Always_Lock_Free or else |
8094 | Id = Attribute_Definite or else | |
8095 | Id = Attribute_Has_Access_Values or else | |
8096 | Id = Attribute_Has_Discriminants or else | |
8097 | Id = Attribute_Has_Tagged_Values or else | |
8098 | Id = Attribute_Lock_Free or else | |
8099 | Id = Attribute_Type_Class or else | |
8100 | Id = Attribute_Unconstrained_Array or else | |
c4e5e10f | 8101 | Id = Attribute_Component_Size |
996ae0b0 RK |
8102 | then |
8103 | Static := False; | |
edab6088 | 8104 | Set_Is_Static_Expression (N, False); |
996ae0b0 | 8105 | |
4adf3c50 | 8106 | elsif Id /= Attribute_Max_Alignment_For_Allocation then |
996ae0b0 | 8107 | if not Is_Constrained (P_Type) |
c4e5e10f TQ |
8108 | or else (Id /= Attribute_First and then |
8109 | Id /= Attribute_Last and then | |
996ae0b0 RK |
8110 | Id /= Attribute_Length) |
8111 | then | |
8112 | Check_Expressions; | |
8113 | return; | |
8114 | end if; | |
8115 | ||
8116 | -- The rules in (RM 4.9(7,8)) require a static array, but as in the | |
8117 | -- scalar case, we hold off on enforcing staticness, since there are | |
8118 | -- cases which we can fold at compile time even though they are not | |
8119 | -- static (e.g. 'Length applied to a static index, even though other | |
8120 | -- non-static indexes make the array type non-static). This is only | |
fbf5a39b | 8121 | -- an optimization, but it falls out essentially free, so why not. |
996ae0b0 RK |
8122 | -- Again we compute the variable Static for easy reference later |
8123 | -- (note that no array attributes are static in Ada 83). | |
8dbd1460 | 8124 | |
2ddc2000 | 8125 | -- We also need to set Static properly for subsequent legality checks |
df46b832 AC |
8126 | -- which might otherwise accept non-static constants in contexts |
8127 | -- where they are not legal. | |
996ae0b0 | 8128 | |
edab6088 RD |
8129 | Static := |
8130 | Ada_Version >= Ada_95 and then Statically_Denotes_Entity (P); | |
8131 | Set_Is_Static_Expression (N, Static); | |
996ae0b0 RK |
8132 | |
8133 | declare | |
edab6088 | 8134 | Nod : Node_Id; |
996ae0b0 RK |
8135 | |
8136 | begin | |
edab6088 | 8137 | Nod := First_Index (P_Type); |
df46b832 AC |
8138 | |
8139 | -- The expression is static if the array type is constrained | |
8140 | -- by given bounds, and not by an initial expression. Constant | |
8141 | -- strings are static in any case. | |
8142 | ||
8143 | if Root_Type (P_Type) /= Standard_String then | |
8144 | Static := | |
8145 | Static and then not Is_Constr_Subt_For_U_Nominal (P_Type); | |
edab6088 | 8146 | Set_Is_Static_Expression (N, Static); |
df46b832 AC |
8147 | end if; |
8148 | ||
edab6088 RD |
8149 | while Present (Nod) loop |
8150 | if not Is_Static_Subtype (Etype (Nod)) then | |
8151 | Static := False; | |
8152 | Set_Is_Static_Expression (N, False); | |
99425ec3 | 8153 | |
edab6088 RD |
8154 | elsif not Is_OK_Static_Subtype (Etype (Nod)) then |
8155 | Set_Raises_Constraint_Error (N); | |
99425ec3 AC |
8156 | Static := False; |
8157 | Set_Is_Static_Expression (N, False); | |
edab6088 | 8158 | end if; |
fbf5a39b | 8159 | |
b4d7b435 AC |
8160 | -- If however the index type is generic, or derived from |
8161 | -- one, attributes cannot be folded. | |
fbf5a39b | 8162 | |
edab6088 | 8163 | if Is_Generic_Type (Root_Type (Etype (Nod))) |
fbf5a39b AC |
8164 | and then Id /= Attribute_Component_Size |
8165 | then | |
8166 | return; | |
8167 | end if; | |
8168 | ||
edab6088 | 8169 | Next_Index (Nod); |
996ae0b0 RK |
8170 | end loop; |
8171 | end; | |
8172 | end if; | |
8173 | ||
8174 | -- Check any expressions that are present. Note that these expressions, | |
8175 | -- depending on the particular attribute type, are either part of the | |
8176 | -- attribute designator, or they are arguments in a case where the | |
8177 | -- attribute reference returns a function. In the latter case, the | |
8178 | -- rule in (RM 4.9(22)) applies and in particular requires the type | |
8179 | -- of the expressions to be scalar in order for the attribute to be | |
8180 | -- considered to be static. | |
8181 | ||
8182 | declare | |
8183 | E : Node_Id; | |
8184 | ||
8185 | begin | |
8186 | E := E1; | |
99425ec3 | 8187 | |
996ae0b0 RK |
8188 | while Present (E) loop |
8189 | ||
8190 | -- If expression is not static, then the attribute reference | |
fbf5a39b AC |
8191 | -- result certainly cannot be static. |
8192 | ||
8193 | if not Is_Static_Expression (E) then | |
8194 | Static := False; | |
edab6088 RD |
8195 | Set_Is_Static_Expression (N, False); |
8196 | end if; | |
8197 | ||
8198 | if Raises_Constraint_Error (E) then | |
8199 | Set_Raises_Constraint_Error (N); | |
fbf5a39b | 8200 | end if; |
996ae0b0 | 8201 | |
fbf5a39b AC |
8202 | -- If the result is not known at compile time, or is not of |
8203 | -- a scalar type, then the result is definitely not static, | |
8204 | -- so we can quit now. | |
996ae0b0 | 8205 | |
fbf5a39b | 8206 | if not Compile_Time_Known_Value (E) |
996ae0b0 RK |
8207 | or else not Is_Scalar_Type (Etype (E)) |
8208 | then | |
fbf5a39b AC |
8209 | -- An odd special case, if this is a Pos attribute, this |
8210 | -- is where we need to apply a range check since it does | |
8211 | -- not get done anywhere else. | |
8212 | ||
996ae0b0 RK |
8213 | if Id = Attribute_Pos then |
8214 | if Is_Integer_Type (Etype (E)) then | |
8215 | Apply_Range_Check (E, Etype (N)); | |
8216 | end if; | |
8217 | end if; | |
8218 | ||
8219 | Check_Expressions; | |
8220 | return; | |
8221 | ||
8222 | -- If the expression raises a constraint error, then so does | |
8223 | -- the attribute reference. We keep going in this case because | |
8224 | -- we are still interested in whether the attribute reference | |
8225 | -- is static even if it is not static. | |
8226 | ||
8227 | elsif Raises_Constraint_Error (E) then | |
8228 | Set_Raises_Constraint_Error (N); | |
8229 | end if; | |
8230 | ||
8231 | Next (E); | |
8232 | end loop; | |
8233 | ||
8234 | if Raises_Constraint_Error (Prefix (N)) then | |
99425ec3 | 8235 | Set_Is_Static_Expression (N, False); |
996ae0b0 RK |
8236 | return; |
8237 | end if; | |
8238 | end; | |
8239 | ||
8240 | -- Deal with the case of a static attribute reference that raises | |
8241 | -- constraint error. The Raises_Constraint_Error flag will already | |
8242 | -- have been set, and the Static flag shows whether the attribute | |
8243 | -- reference is static. In any case we certainly can't fold such an | |
8244 | -- attribute reference. | |
8245 | ||
8246 | -- Note that the rewriting of the attribute node with the constraint | |
8247 | -- error node is essential in this case, because otherwise Gigi might | |
8248 | -- blow up on one of the attributes it never expects to see. | |
8249 | ||
8250 | -- The constraint_error node must have the type imposed by the context, | |
8251 | -- to avoid spurious errors in the enclosing expression. | |
8252 | ||
8253 | if Raises_Constraint_Error (N) then | |
8254 | CE_Node := | |
07fc65c4 GB |
8255 | Make_Raise_Constraint_Error (Sloc (N), |
8256 | Reason => CE_Range_Check_Failed); | |
996ae0b0 RK |
8257 | Set_Etype (CE_Node, Etype (N)); |
8258 | Set_Raises_Constraint_Error (CE_Node); | |
8259 | Check_Expressions; | |
8260 | Rewrite (N, Relocate_Node (CE_Node)); | |
edab6088 | 8261 | Set_Raises_Constraint_Error (N, True); |
996ae0b0 RK |
8262 | return; |
8263 | end if; | |
8264 | ||
8265 | -- At this point we have a potentially foldable attribute reference. | |
8266 | -- If Static is set, then the attribute reference definitely obeys | |
8267 | -- the requirements in (RM 4.9(7,8,22)), and it definitely can be | |
8268 | -- folded. If Static is not set, then the attribute may or may not | |
8269 | -- be foldable, and the individual attribute processing routines | |
8270 | -- test Static as required in cases where it makes a difference. | |
8271 | ||
fbf5a39b | 8272 | -- In the case where Static is not set, we do know that all the |
bb3c784c AC |
8273 | -- expressions present are at least known at compile time (we assumed |
8274 | -- above that if this was not the case, then there was no hope of static | |
8275 | -- evaluation). However, we did not require that the bounds of the | |
8276 | -- prefix type be compile time known, let alone static). That's because | |
8277 | -- there are many attributes that can be computed at compile time on | |
8278 | -- non-static subtypes, even though such references are not static | |
8279 | -- expressions. | |
fbf5a39b | 8280 | |
7b55fea6 AC |
8281 | -- For VAX float, the root type is an IEEE type. So make sure to use the |
8282 | -- base type instead of the root-type for floating point attributes. | |
8283 | ||
996ae0b0 RK |
8284 | case Id is |
8285 | ||
b2c3160c AC |
8286 | -- Attributes related to Ada 2012 iterators; nothing to evaluate for |
8287 | -- these. | |
0da80d7d | 8288 | |
d8f43ee6 HK |
8289 | when Attribute_Constant_Indexing |
8290 | | Attribute_Default_Iterator | |
8291 | | Attribute_Implicit_Dereference | |
8292 | | Attribute_Iterator_Element | |
8293 | | Attribute_Iterable | |
3c08de34 | 8294 | | Attribute_Reduce |
d8f43ee6 HK |
8295 | | Attribute_Variable_Indexing |
8296 | => | |
8297 | null; | |
b98e2969 | 8298 | |
4199e8c6 RD |
8299 | -- Internal attributes used to deal with Ada 2012 delayed aspects. |
8300 | -- These were already rejected by the parser. Thus they shouldn't | |
8301 | -- appear here. | |
b98e2969 | 8302 | |
4199e8c6 RD |
8303 | when Internal_Attribute_Id => |
8304 | raise Program_Error; | |
0da80d7d | 8305 | |
996ae0b0 RK |
8306 | -------------- |
8307 | -- Adjacent -- | |
8308 | -------------- | |
8309 | ||
8310 | when Attribute_Adjacent => | |
af31bd57 AC |
8311 | Fold_Ureal |
8312 | (N, | |
8313 | Eval_Fat.Adjacent | |
8314 | (P_Base_Type, Expr_Value_R (E1), Expr_Value_R (E2)), | |
8315 | Static); | |
996ae0b0 RK |
8316 | |
8317 | --------- | |
8318 | -- Aft -- | |
8319 | --------- | |
8320 | ||
8321 | when Attribute_Aft => | |
edab6088 | 8322 | Fold_Uint (N, Aft_Value (P_Type), Static); |
996ae0b0 RK |
8323 | |
8324 | --------------- | |
8325 | -- Alignment -- | |
8326 | --------------- | |
8327 | ||
8328 | when Attribute_Alignment => Alignment_Block : declare | |
8329 | P_TypeA : constant Entity_Id := Underlying_Type (P_Type); | |
8330 | ||
8331 | begin | |
8332 | -- Fold if alignment is set and not otherwise | |
8333 | ||
8334 | if Known_Alignment (P_TypeA) then | |
edab6088 | 8335 | Fold_Uint (N, Alignment (P_TypeA), Static); |
996ae0b0 RK |
8336 | end if; |
8337 | end Alignment_Block; | |
8338 | ||
0ebc109a VP |
8339 | ----------------------------- |
8340 | -- Atomic_Always_Lock_Free -- | |
8341 | ----------------------------- | |
8342 | ||
8343 | -- Atomic_Always_Lock_Free attribute is a Boolean, thus no need to fold | |
8344 | -- here. | |
8345 | ||
8346 | when Attribute_Atomic_Always_Lock_Free => Atomic_Always_Lock_Free : | |
8347 | declare | |
8348 | V : constant Entity_Id := | |
8349 | Boolean_Literals | |
8350 | (Support_Atomic_Primitives_On_Target | |
8351 | and then Support_Atomic_Primitives (P_Type)); | |
8352 | ||
8353 | begin | |
8354 | Rewrite (N, New_Occurrence_Of (V, Loc)); | |
8355 | ||
8356 | -- Analyze and resolve as boolean. Note that this attribute is a | |
8357 | -- static attribute in GNAT. | |
8358 | ||
8359 | Analyze_And_Resolve (N, Standard_Boolean); | |
1e3c434f | 8360 | Static := True; |
89beb653 | 8361 | Set_Is_Static_Expression (N); |
0ebc109a VP |
8362 | end Atomic_Always_Lock_Free; |
8363 | ||
996ae0b0 RK |
8364 | --------- |
8365 | -- Bit -- | |
8366 | --------- | |
8367 | ||
8368 | -- Bit can never be folded | |
8369 | ||
8370 | when Attribute_Bit => | |
8371 | null; | |
8372 | ||
8373 | ------------------ | |
8374 | -- Body_Version -- | |
8375 | ------------------ | |
8376 | ||
8377 | -- Body_version can never be static | |
8378 | ||
8379 | when Attribute_Body_Version => | |
8380 | null; | |
8381 | ||
8382 | ------------- | |
8383 | -- Ceiling -- | |
8384 | ------------- | |
8385 | ||
8386 | when Attribute_Ceiling => | |
af31bd57 AC |
8387 | Fold_Ureal |
8388 | (N, Eval_Fat.Ceiling (P_Base_Type, Expr_Value_R (E1)), Static); | |
996ae0b0 RK |
8389 | |
8390 | -------------------- | |
8391 | -- Component_Size -- | |
8392 | -------------------- | |
8393 | ||
8394 | when Attribute_Component_Size => | |
fbf5a39b | 8395 | if Known_Static_Component_Size (P_Type) then |
edab6088 | 8396 | Fold_Uint (N, Component_Size (P_Type), Static); |
996ae0b0 RK |
8397 | end if; |
8398 | ||
8399 | ------------- | |
8400 | -- Compose -- | |
8401 | ------------- | |
8402 | ||
8403 | when Attribute_Compose => | |
af31bd57 AC |
8404 | Fold_Ureal |
8405 | (N, | |
8406 | Eval_Fat.Compose (P_Base_Type, Expr_Value_R (E1), Expr_Value (E2)), | |
8407 | Static); | |
996ae0b0 RK |
8408 | |
8409 | ----------------- | |
8410 | -- Constrained -- | |
8411 | ----------------- | |
8412 | ||
8413 | -- Constrained is never folded for now, there may be cases that | |
12a13f01 | 8414 | -- could be handled at compile time. To be looked at later. |
996ae0b0 RK |
8415 | |
8416 | when Attribute_Constrained => | |
6c56d9b8 AC |
8417 | |
8418 | -- The expander might fold it and set the static flag accordingly, | |
8419 | -- but with expansion disabled (as in ASIS), it remains as an | |
8420 | -- attribute reference, and this reference is not static. | |
8421 | ||
8422 | Set_Is_Static_Expression (N, False); | |
996ae0b0 RK |
8423 | |
8424 | --------------- | |
8425 | -- Copy_Sign -- | |
8426 | --------------- | |
8427 | ||
8428 | when Attribute_Copy_Sign => | |
af31bd57 AC |
8429 | Fold_Ureal |
8430 | (N, | |
8431 | Eval_Fat.Copy_Sign | |
8432 | (P_Base_Type, Expr_Value_R (E1), Expr_Value_R (E2)), | |
8433 | Static); | |
996ae0b0 | 8434 | |
996ae0b0 RK |
8435 | -------------- |
8436 | -- Definite -- | |
8437 | -------------- | |
8438 | ||
8439 | when Attribute_Definite => | |
aa720a54 | 8440 | Rewrite (N, New_Occurrence_Of ( |
83496138 | 8441 | Boolean_Literals (Is_Definite_Subtype (P_Entity)), Loc)); |
aa720a54 | 8442 | Analyze_And_Resolve (N, Standard_Boolean); |
996ae0b0 | 8443 | |
a01b9df6 AC |
8444 | ----------- |
8445 | -- Delta -- | |
8446 | ----------- | |
8447 | ||
8448 | when Attribute_Delta => | |
8449 | Fold_Ureal (N, Delta_Value (P_Type), True); | |
8450 | ||
996ae0b0 RK |
8451 | ------------ |
8452 | -- Denorm -- | |
8453 | ------------ | |
8454 | ||
8455 | when Attribute_Denorm => | |
8456 | Fold_Uint | |
edab6088 | 8457 | (N, UI_From_Int (Boolean'Pos (Has_Denormals (P_Type))), Static); |
996ae0b0 | 8458 | |
203ddcea AC |
8459 | --------------------- |
8460 | -- Descriptor_Size -- | |
8461 | --------------------- | |
8462 | ||
8463 | when Attribute_Descriptor_Size => | |
8464 | null; | |
8465 | ||
996ae0b0 RK |
8466 | ------------ |
8467 | -- Digits -- | |
8468 | ------------ | |
8469 | ||
8470 | when Attribute_Digits => | |
edab6088 | 8471 | Fold_Uint (N, Digits_Value (P_Type), Static); |
996ae0b0 RK |
8472 | |
8473 | ---------- | |
8474 | -- Emax -- | |
8475 | ---------- | |
8476 | ||
8477 | when Attribute_Emax => | |
8478 | ||
8479 | -- Ada 83 attribute is defined as (RM83 3.5.8) | |
8480 | ||
8481 | -- T'Emax = 4 * T'Mantissa | |
8482 | ||
edab6088 | 8483 | Fold_Uint (N, 4 * Mantissa, Static); |
996ae0b0 RK |
8484 | |
8485 | -------------- | |
8486 | -- Enum_Rep -- | |
8487 | -------------- | |
8488 | ||
ca7e6c26 AC |
8489 | when Attribute_Enum_Rep => Enum_Rep : declare |
8490 | Val : Node_Id; | |
8491 | ||
8492 | begin | |
bed87f4f | 8493 | -- The attribute appears in the form: |
ca7e6c26 AC |
8494 | |
8495 | -- Enum_Typ'Enum_Rep (Const) | |
8496 | -- Enum_Typ'Enum_Rep (Enum_Lit) | |
8497 | ||
8498 | if Present (E1) then | |
8499 | Val := E1; | |
8500 | ||
bed87f4f | 8501 | -- Otherwise the prefix denotes a constant or enumeration literal: |
ca7e6c26 AC |
8502 | |
8503 | -- Const'Enum_Rep | |
8504 | -- Enum_Lit'Enum_Rep | |
8505 | ||
8506 | else | |
8507 | Val := P; | |
8508 | end if; | |
996ae0b0 | 8509 | |
82c80734 RD |
8510 | -- For an enumeration type with a non-standard representation use |
8511 | -- the Enumeration_Rep field of the proper constant. Note that this | |
8512 | -- will not work for types Character/Wide_[Wide-]Character, since no | |
8513 | -- real entities are created for the enumeration literals, but that | |
8514 | -- does not matter since these two types do not have non-standard | |
8515 | -- representations anyway. | |
996ae0b0 | 8516 | |
fbf5a39b AC |
8517 | if Is_Enumeration_Type (P_Type) |
8518 | and then Has_Non_Standard_Rep (P_Type) | |
8519 | then | |
ca7e6c26 | 8520 | Fold_Uint (N, Enumeration_Rep (Expr_Value_E (Val)), Static); |
996ae0b0 | 8521 | |
ca7e6c26 AC |
8522 | -- For enumeration types with standard representations and all other |
8523 | -- cases (i.e. all integer and modular types), Enum_Rep is equivalent | |
8524 | -- to Pos. | |
996ae0b0 | 8525 | |
fbf5a39b | 8526 | else |
ca7e6c26 | 8527 | Fold_Uint (N, Expr_Value (Val), Static); |
996ae0b0 | 8528 | end if; |
ca7e6c26 | 8529 | end Enum_Rep; |
996ae0b0 | 8530 | |
21d27997 RD |
8531 | -------------- |
8532 | -- Enum_Val -- | |
8533 | -------------- | |
8534 | ||
8535 | when Attribute_Enum_Val => Enum_Val : declare | |
8536 | Lit : Node_Id; | |
8537 | ||
8538 | begin | |
8539 | -- We have something like Enum_Type'Enum_Val (23), so search for a | |
8540 | -- corresponding value in the list of Enum_Rep values for the type. | |
8541 | ||
8542 | Lit := First_Literal (P_Base_Type); | |
8543 | loop | |
8544 | if Enumeration_Rep (Lit) = Expr_Value (E1) then | |
8545 | Fold_Uint (N, Enumeration_Pos (Lit), Static); | |
8546 | exit; | |
8547 | end if; | |
8548 | ||
8549 | Next_Literal (Lit); | |
8550 | ||
8551 | if No (Lit) then | |
8552 | Apply_Compile_Time_Constraint_Error | |
8553 | (N, "no representation value matches", | |
8554 | CE_Range_Check_Failed, | |
8555 | Warn => not Static); | |
8556 | exit; | |
8557 | end if; | |
8558 | end loop; | |
8559 | end Enum_Val; | |
8560 | ||
996ae0b0 RK |
8561 | ------------- |
8562 | -- Epsilon -- | |
8563 | ------------- | |
8564 | ||
8565 | when Attribute_Epsilon => | |
8566 | ||
8567 | -- Ada 83 attribute is defined as (RM83 3.5.8) | |
8568 | ||
8569 | -- T'Epsilon = 2.0**(1 - T'Mantissa) | |
8570 | ||
fbf5a39b | 8571 | Fold_Ureal (N, Ureal_2 ** (1 - Mantissa), True); |
996ae0b0 RK |
8572 | |
8573 | -------------- | |
8574 | -- Exponent -- | |
8575 | -------------- | |
8576 | ||
8577 | when Attribute_Exponent => | |
fbf5a39b | 8578 | Fold_Uint (N, |
7b55fea6 | 8579 | Eval_Fat.Exponent (P_Base_Type, Expr_Value_R (E1)), Static); |
996ae0b0 | 8580 | |
f68d3344 JS |
8581 | ----------------------- |
8582 | -- Finalization_Size -- | |
8583 | ----------------------- | |
8584 | ||
8585 | when Attribute_Finalization_Size => | |
8586 | null; | |
8587 | ||
996ae0b0 RK |
8588 | ----------- |
8589 | -- First -- | |
8590 | ----------- | |
8591 | ||
d8f43ee6 | 8592 | when Attribute_First => |
996ae0b0 RK |
8593 | Set_Bounds; |
8594 | ||
8595 | if Compile_Time_Known_Value (Lo_Bound) then | |
8596 | if Is_Real_Type (P_Type) then | |
fbf5a39b | 8597 | Fold_Ureal (N, Expr_Value_R (Lo_Bound), Static); |
996ae0b0 | 8598 | else |
fbf5a39b | 8599 | Fold_Uint (N, Expr_Value (Lo_Bound), Static); |
996ae0b0 | 8600 | end if; |
6ca9ec9c | 8601 | |
5a153b27 AC |
8602 | else |
8603 | Check_Concurrent_Discriminant (Lo_Bound); | |
996ae0b0 | 8604 | end if; |
996ae0b0 | 8605 | |
011f9d5d AC |
8606 | ----------------- |
8607 | -- First_Valid -- | |
8608 | ----------------- | |
8609 | ||
d8f43ee6 | 8610 | when Attribute_First_Valid => |
011f9d5d | 8611 | if Has_Predicates (P_Type) |
60f908dd | 8612 | and then Has_Static_Predicate (P_Type) |
011f9d5d AC |
8613 | then |
8614 | declare | |
60f908dd RD |
8615 | FirstN : constant Node_Id := |
8616 | First (Static_Discrete_Predicate (P_Type)); | |
011f9d5d AC |
8617 | begin |
8618 | if Nkind (FirstN) = N_Range then | |
8619 | Fold_Uint (N, Expr_Value (Low_Bound (FirstN)), Static); | |
8620 | else | |
8621 | Fold_Uint (N, Expr_Value (FirstN), Static); | |
8622 | end if; | |
8623 | end; | |
8624 | ||
8625 | else | |
8626 | Set_Bounds; | |
8627 | Fold_Uint (N, Expr_Value (Lo_Bound), Static); | |
8628 | end if; | |
011f9d5d | 8629 | |
996ae0b0 RK |
8630 | ----------------- |
8631 | -- Fixed_Value -- | |
8632 | ----------------- | |
8633 | ||
8634 | when Attribute_Fixed_Value => | |
8635 | null; | |
8636 | ||
8637 | ----------- | |
8638 | -- Floor -- | |
8639 | ----------- | |
8640 | ||
8641 | when Attribute_Floor => | |
af31bd57 AC |
8642 | Fold_Ureal |
8643 | (N, Eval_Fat.Floor (P_Base_Type, Expr_Value_R (E1)), Static); | |
996ae0b0 RK |
8644 | |
8645 | ---------- | |
8646 | -- Fore -- | |
8647 | ---------- | |
8648 | ||
8649 | when Attribute_Fore => | |
fbf5a39b AC |
8650 | if Compile_Time_Known_Bounds (P_Type) then |
8651 | Fold_Uint (N, UI_From_Int (Fore_Value), Static); | |
996ae0b0 RK |
8652 | end if; |
8653 | ||
8654 | -------------- | |
8655 | -- Fraction -- | |
8656 | -------------- | |
8657 | ||
8658 | when Attribute_Fraction => | |
af31bd57 AC |
8659 | Fold_Ureal |
8660 | (N, Eval_Fat.Fraction (P_Base_Type, Expr_Value_R (E1)), Static); | |
996ae0b0 | 8661 | |
15ce9ca2 AC |
8662 | ----------------------- |
8663 | -- Has_Access_Values -- | |
8664 | ----------------------- | |
8665 | ||
8666 | when Attribute_Has_Access_Values => | |
8667 | Rewrite (N, New_Occurrence_Of | |
8668 | (Boolean_Literals (Has_Access_Values (P_Root_Type)), Loc)); | |
8669 | Analyze_And_Resolve (N, Standard_Boolean); | |
8670 | ||
996ae0b0 RK |
8671 | ----------------------- |
8672 | -- Has_Discriminants -- | |
8673 | ----------------------- | |
8674 | ||
8675 | when Attribute_Has_Discriminants => | |
aa720a54 AC |
8676 | Rewrite (N, New_Occurrence_Of ( |
8677 | Boolean_Literals (Has_Discriminants (P_Entity)), Loc)); | |
8678 | Analyze_And_Resolve (N, Standard_Boolean); | |
996ae0b0 | 8679 | |
ea70f3d0 RD |
8680 | ---------------------- |
8681 | -- Has_Same_Storage -- | |
8682 | ---------------------- | |
8683 | ||
8684 | when Attribute_Has_Same_Storage => | |
8685 | null; | |
8686 | ||
21d27997 RD |
8687 | ----------------------- |
8688 | -- Has_Tagged_Values -- | |
8689 | ----------------------- | |
8690 | ||
8691 | when Attribute_Has_Tagged_Values => | |
8692 | Rewrite (N, New_Occurrence_Of | |
8693 | (Boolean_Literals (Has_Tagged_Component (P_Root_Type)), Loc)); | |
8694 | Analyze_And_Resolve (N, Standard_Boolean); | |
8695 | ||
996ae0b0 RK |
8696 | -------------- |
8697 | -- Identity -- | |
8698 | -------------- | |
8699 | ||
8700 | when Attribute_Identity => | |
8701 | null; | |
8702 | ||
8703 | ----------- | |
8704 | -- Image -- | |
8705 | ----------- | |
8706 | ||
8707 | -- Image is a scalar attribute, but is never static, because it is | |
8708 | -- not a static function (having a non-scalar argument (RM 4.9(22)) | |
442ade9d RD |
8709 | -- However, we can constant-fold the image of an enumeration literal |
8710 | -- if names are available. | |
996ae0b0 RK |
8711 | |
8712 | when Attribute_Image => | |
442ade9d RD |
8713 | if Is_Entity_Name (E1) |
8714 | and then Ekind (Entity (E1)) = E_Enumeration_Literal | |
8715 | and then not Discard_Names (First_Subtype (Etype (E1))) | |
8716 | and then not Global_Discard_Names | |
8717 | then | |
8718 | declare | |
8719 | Lit : constant Entity_Id := Entity (E1); | |
8720 | Str : String_Id; | |
8721 | begin | |
8722 | Start_String; | |
8723 | Get_Unqualified_Decoded_Name_String (Chars (Lit)); | |
8724 | Set_Casing (All_Upper_Case); | |
8725 | Store_String_Chars (Name_Buffer (1 .. Name_Len)); | |
8726 | Str := End_String; | |
8727 | Rewrite (N, Make_String_Literal (Loc, Strval => Str)); | |
8728 | Analyze_And_Resolve (N, Standard_String); | |
8729 | Set_Is_Static_Expression (N, False); | |
8730 | end; | |
8731 | end if; | |
996ae0b0 | 8732 | |
996ae0b0 RK |
8733 | ------------------- |
8734 | -- Integer_Value -- | |
8735 | ------------------- | |
8736 | ||
21d27997 RD |
8737 | -- We never try to fold Integer_Value (though perhaps we could???) |
8738 | ||
996ae0b0 RK |
8739 | when Attribute_Integer_Value => |
8740 | null; | |
8741 | ||
21d27997 RD |
8742 | ------------------- |
8743 | -- Invalid_Value -- | |
8744 | ------------------- | |
8745 | ||
8746 | -- Invalid_Value is a scalar attribute that is never static, because | |
8747 | -- the value is by design out of range. | |
8748 | ||
8749 | when Attribute_Invalid_Value => | |
8750 | null; | |
8751 | ||
996ae0b0 RK |
8752 | ----------- |
8753 | -- Large -- | |
8754 | ----------- | |
8755 | ||
8756 | when Attribute_Large => | |
8757 | ||
8758 | -- For fixed-point, we use the identity: | |
8759 | ||
8760 | -- T'Large = (2.0**T'Mantissa - 1.0) * T'Small | |
8761 | ||
8762 | if Is_Fixed_Point_Type (P_Type) then | |
8763 | Rewrite (N, | |
8764 | Make_Op_Multiply (Loc, | |
8765 | Left_Opnd => | |
8766 | Make_Op_Subtract (Loc, | |
8767 | Left_Opnd => | |
8768 | Make_Op_Expon (Loc, | |
8769 | Left_Opnd => | |
8770 | Make_Real_Literal (Loc, Ureal_2), | |
8771 | Right_Opnd => | |
8772 | Make_Attribute_Reference (Loc, | |
8773 | Prefix => P, | |
8774 | Attribute_Name => Name_Mantissa)), | |
8775 | Right_Opnd => Make_Real_Literal (Loc, Ureal_1)), | |
8776 | ||
8777 | Right_Opnd => | |
8778 | Make_Real_Literal (Loc, Small_Value (Entity (P))))); | |
8779 | ||
8780 | Analyze_And_Resolve (N, C_Type); | |
8781 | ||
8782 | -- Floating-point (Ada 83 compatibility) | |
8783 | ||
8784 | else | |
8785 | -- Ada 83 attribute is defined as (RM83 3.5.8) | |
8786 | ||
8787 | -- T'Large = 2.0**T'Emax * (1.0 - 2.0**(-T'Mantissa)) | |
8788 | ||
8789 | -- where | |
8790 | ||
8791 | -- T'Emax = 4 * T'Mantissa | |
8792 | ||
af31bd57 AC |
8793 | Fold_Ureal |
8794 | (N, | |
8795 | Ureal_2 ** (4 * Mantissa) * (Ureal_1 - Ureal_2 ** (-Mantissa)), | |
8796 | True); | |
996ae0b0 RK |
8797 | end if; |
8798 | ||
2a290fec AC |
8799 | --------------- |
8800 | -- Lock_Free -- | |
8801 | --------------- | |
8802 | ||
0ebc109a VP |
8803 | when Attribute_Lock_Free => Lock_Free : declare |
8804 | V : constant Entity_Id := Boolean_Literals (Uses_Lock_Free (P_Type)); | |
2a290fec | 8805 | |
0ebc109a VP |
8806 | begin |
8807 | Rewrite (N, New_Occurrence_Of (V, Loc)); | |
8808 | ||
8809 | -- Analyze and resolve as boolean. Note that this attribute is a | |
8810 | -- static attribute in GNAT. | |
8811 | ||
8812 | Analyze_And_Resolve (N, Standard_Boolean); | |
1e3c434f | 8813 | Static := True; |
89beb653 | 8814 | Set_Is_Static_Expression (N); |
0ebc109a | 8815 | end Lock_Free; |
2a290fec | 8816 | |
996ae0b0 RK |
8817 | ---------- |
8818 | -- Last -- | |
8819 | ---------- | |
8820 | ||
d8f43ee6 | 8821 | when Attribute_Last => |
996ae0b0 RK |
8822 | Set_Bounds; |
8823 | ||
8824 | if Compile_Time_Known_Value (Hi_Bound) then | |
8825 | if Is_Real_Type (P_Type) then | |
fbf5a39b | 8826 | Fold_Ureal (N, Expr_Value_R (Hi_Bound), Static); |
996ae0b0 | 8827 | else |
fbf5a39b | 8828 | Fold_Uint (N, Expr_Value (Hi_Bound), Static); |
996ae0b0 | 8829 | end if; |
6ca9ec9c | 8830 | |
5a153b27 AC |
8831 | else |
8832 | Check_Concurrent_Discriminant (Hi_Bound); | |
996ae0b0 | 8833 | end if; |
011f9d5d AC |
8834 | |
8835 | ---------------- | |
8836 | -- Last_Valid -- | |
8837 | ---------------- | |
8838 | ||
d8f43ee6 | 8839 | when Attribute_Last_Valid => |
011f9d5d | 8840 | if Has_Predicates (P_Type) |
60f908dd | 8841 | and then Has_Static_Predicate (P_Type) |
011f9d5d AC |
8842 | then |
8843 | declare | |
60f908dd RD |
8844 | LastN : constant Node_Id := |
8845 | Last (Static_Discrete_Predicate (P_Type)); | |
011f9d5d AC |
8846 | begin |
8847 | if Nkind (LastN) = N_Range then | |
8848 | Fold_Uint (N, Expr_Value (High_Bound (LastN)), Static); | |
8849 | else | |
8850 | Fold_Uint (N, Expr_Value (LastN), Static); | |
8851 | end if; | |
8852 | end; | |
8853 | ||
8854 | else | |
8855 | Set_Bounds; | |
8856 | Fold_Uint (N, Expr_Value (Hi_Bound), Static); | |
8857 | end if; | |
996ae0b0 RK |
8858 | |
8859 | ------------------ | |
8860 | -- Leading_Part -- | |
8861 | ------------------ | |
8862 | ||
8863 | when Attribute_Leading_Part => | |
af31bd57 AC |
8864 | Fold_Ureal |
8865 | (N, | |
8866 | Eval_Fat.Leading_Part | |
8867 | (P_Base_Type, Expr_Value_R (E1), Expr_Value (E2)), | |
8868 | Static); | |
996ae0b0 RK |
8869 | |
8870 | ------------ | |
8871 | -- Length -- | |
8872 | ------------ | |
8873 | ||
fbf5a39b AC |
8874 | when Attribute_Length => Length : declare |
8875 | Ind : Node_Id; | |
8876 | ||
996ae0b0 | 8877 | begin |
b4d7b435 AC |
8878 | -- If any index type is a formal type, or derived from one, the |
8879 | -- bounds are not static. Treating them as static can produce | |
8880 | -- spurious warnings or improper constant folding. | |
fbf5a39b AC |
8881 | |
8882 | Ind := First_Index (P_Type); | |
fbf5a39b | 8883 | while Present (Ind) loop |
b4d7b435 | 8884 | if Is_Generic_Type (Root_Type (Etype (Ind))) then |
fbf5a39b AC |
8885 | return; |
8886 | end if; | |
8887 | ||
8888 | Next_Index (Ind); | |
8889 | end loop; | |
8890 | ||
996ae0b0 RK |
8891 | Set_Bounds; |
8892 | ||
af02a866 RD |
8893 | -- For two compile time values, we can compute length |
8894 | ||
996ae0b0 RK |
8895 | if Compile_Time_Known_Value (Lo_Bound) |
8896 | and then Compile_Time_Known_Value (Hi_Bound) | |
8897 | then | |
8898 | Fold_Uint (N, | |
fbf5a39b | 8899 | UI_Max (0, 1 + (Expr_Value (Hi_Bound) - Expr_Value (Lo_Bound))), |
edab6088 | 8900 | Static); |
996ae0b0 | 8901 | end if; |
af02a866 RD |
8902 | |
8903 | -- One more case is where Hi_Bound and Lo_Bound are compile-time | |
8904 | -- comparable, and we can figure out the difference between them. | |
8905 | ||
8906 | declare | |
8907 | Diff : aliased Uint; | |
8908 | ||
8909 | begin | |
8910 | case | |
8911 | Compile_Time_Compare | |
8912 | (Lo_Bound, Hi_Bound, Diff'Access, Assume_Valid => False) | |
8913 | is | |
8914 | when EQ => | |
edab6088 | 8915 | Fold_Uint (N, Uint_1, Static); |
af02a866 RD |
8916 | |
8917 | when GT => | |
edab6088 | 8918 | Fold_Uint (N, Uint_0, Static); |
af02a866 RD |
8919 | |
8920 | when LT => | |
8921 | if Diff /= No_Uint then | |
edab6088 | 8922 | Fold_Uint (N, Diff + 1, Static); |
af02a866 RD |
8923 | end if; |
8924 | ||
8925 | when others => | |
8926 | null; | |
8927 | end case; | |
8928 | end; | |
996ae0b0 RK |
8929 | end Length; |
8930 | ||
150ac76e AC |
8931 | ---------------- |
8932 | -- Loop_Entry -- | |
8933 | ---------------- | |
8934 | ||
739e7bbf AC |
8935 | -- Loop_Entry acts as an alias of a constant initialized to the prefix |
8936 | -- of the said attribute at the point of entry into the related loop. As | |
8937 | -- such, the attribute reference does not need to be evaluated because | |
8938 | -- the prefix is the one that is evaluted. | |
97ce3a14 | 8939 | |
150ac76e AC |
8940 | when Attribute_Loop_Entry => |
8941 | null; | |
8942 | ||
996ae0b0 RK |
8943 | ------------- |
8944 | -- Machine -- | |
8945 | ------------- | |
8946 | ||
8947 | when Attribute_Machine => | |
af31bd57 AC |
8948 | Fold_Ureal |
8949 | (N, | |
8950 | Eval_Fat.Machine | |
8951 | (P_Base_Type, Expr_Value_R (E1), Eval_Fat.Round, N), | |
8952 | Static); | |
996ae0b0 RK |
8953 | |
8954 | ------------------ | |
8955 | -- Machine_Emax -- | |
8956 | ------------------ | |
8957 | ||
8958 | when Attribute_Machine_Emax => | |
d32e3cee | 8959 | Fold_Uint (N, Machine_Emax_Value (P_Type), Static); |
996ae0b0 RK |
8960 | |
8961 | ------------------ | |
8962 | -- Machine_Emin -- | |
8963 | ------------------ | |
8964 | ||
8965 | when Attribute_Machine_Emin => | |
d32e3cee | 8966 | Fold_Uint (N, Machine_Emin_Value (P_Type), Static); |
996ae0b0 RK |
8967 | |
8968 | ---------------------- | |
8969 | -- Machine_Mantissa -- | |
8970 | ---------------------- | |
8971 | ||
8972 | when Attribute_Machine_Mantissa => | |
d32e3cee | 8973 | Fold_Uint (N, Machine_Mantissa_Value (P_Type), Static); |
996ae0b0 RK |
8974 | |
8975 | ----------------------- | |
8976 | -- Machine_Overflows -- | |
8977 | ----------------------- | |
8978 | ||
8979 | when Attribute_Machine_Overflows => | |
8980 | ||
8981 | -- Always true for fixed-point | |
8982 | ||
8983 | if Is_Fixed_Point_Type (P_Type) then | |
edab6088 | 8984 | Fold_Uint (N, True_Value, Static); |
996ae0b0 RK |
8985 | |
8986 | -- Floating point case | |
8987 | ||
8988 | else | |
fbf5a39b AC |
8989 | Fold_Uint (N, |
8990 | UI_From_Int (Boolean'Pos (Machine_Overflows_On_Target)), | |
edab6088 | 8991 | Static); |
996ae0b0 RK |
8992 | end if; |
8993 | ||
8994 | ------------------- | |
8995 | -- Machine_Radix -- | |
8996 | ------------------- | |
8997 | ||
8998 | when Attribute_Machine_Radix => | |
8999 | if Is_Fixed_Point_Type (P_Type) then | |
9000 | if Is_Decimal_Fixed_Point_Type (P_Type) | |
9001 | and then Machine_Radix_10 (P_Type) | |
9002 | then | |
edab6088 | 9003 | Fold_Uint (N, Uint_10, Static); |
996ae0b0 | 9004 | else |
edab6088 | 9005 | Fold_Uint (N, Uint_2, Static); |
996ae0b0 RK |
9006 | end if; |
9007 | ||
9008 | -- All floating-point type always have radix 2 | |
9009 | ||
9010 | else | |
edab6088 | 9011 | Fold_Uint (N, Uint_2, Static); |
996ae0b0 RK |
9012 | end if; |
9013 | ||
65f01153 RD |
9014 | ---------------------- |
9015 | -- Machine_Rounding -- | |
9016 | ---------------------- | |
9017 | ||
9018 | -- Note: for the folding case, it is fine to treat Machine_Rounding | |
9019 | -- exactly the same way as Rounding, since this is one of the allowed | |
9020 | -- behaviors, and performance is not an issue here. It might be a bit | |
e7c0dd39 | 9021 | -- better to give the same result as it would give at run time, even |
65f01153 RD |
9022 | -- though the non-determinism is certainly permitted. |
9023 | ||
9024 | when Attribute_Machine_Rounding => | |
af31bd57 AC |
9025 | Fold_Ureal |
9026 | (N, Eval_Fat.Rounding (P_Base_Type, Expr_Value_R (E1)), Static); | |
65f01153 | 9027 | |
996ae0b0 RK |
9028 | -------------------- |
9029 | -- Machine_Rounds -- | |
9030 | -------------------- | |
9031 | ||
9032 | when Attribute_Machine_Rounds => | |
9033 | ||
9034 | -- Always False for fixed-point | |
9035 | ||
9036 | if Is_Fixed_Point_Type (P_Type) then | |
edab6088 | 9037 | Fold_Uint (N, False_Value, Static); |
996ae0b0 RK |
9038 | |
9039 | -- Else yield proper floating-point result | |
9040 | ||
9041 | else | |
9042 | Fold_Uint | |
edab6088 RD |
9043 | (N, UI_From_Int (Boolean'Pos (Machine_Rounds_On_Target)), |
9044 | Static); | |
996ae0b0 RK |
9045 | end if; |
9046 | ||
9047 | ------------------ | |
9048 | -- Machine_Size -- | |
9049 | ------------------ | |
9050 | ||
9051 | -- Note: Machine_Size is identical to Object_Size | |
9052 | ||
9053 | when Attribute_Machine_Size => Machine_Size : declare | |
9054 | P_TypeA : constant Entity_Id := Underlying_Type (P_Type); | |
9055 | ||
9056 | begin | |
9057 | if Known_Esize (P_TypeA) then | |
edab6088 | 9058 | Fold_Uint (N, Esize (P_TypeA), Static); |
996ae0b0 RK |
9059 | end if; |
9060 | end Machine_Size; | |
9061 | ||
9062 | -------------- | |
9063 | -- Mantissa -- | |
9064 | -------------- | |
9065 | ||
9066 | when Attribute_Mantissa => | |
9067 | ||
9068 | -- Fixed-point mantissa | |
9069 | ||
9070 | if Is_Fixed_Point_Type (P_Type) then | |
9071 | ||
9072 | -- Compile time foldable case | |
9073 | ||
9074 | if Compile_Time_Known_Value (Type_Low_Bound (P_Type)) | |
9075 | and then | |
9076 | Compile_Time_Known_Value (Type_High_Bound (P_Type)) | |
9077 | then | |
9078 | -- The calculation of the obsolete Ada 83 attribute Mantissa | |
9079 | -- is annoying, because of AI00143, quoted here: | |
9080 | ||
9081 | -- !question 84-01-10 | |
9082 | ||
9083 | -- Consider the model numbers for F: | |
9084 | ||
9085 | -- type F is delta 1.0 range -7.0 .. 8.0; | |
9086 | ||
9087 | -- The wording requires that F'MANTISSA be the SMALLEST | |
9088 | -- integer number for which each bound of the specified | |
9089 | -- range is either a model number or lies at most small | |
9090 | -- distant from a model number. This means F'MANTISSA | |
9091 | -- is required to be 3 since the range -7.0 .. 7.0 fits | |
9092 | -- in 3 signed bits, and 8 is "at most" 1.0 from a model | |
9093 | -- number, namely, 7. Is this analysis correct? Note that | |
9094 | -- this implies the upper bound of the range is not | |
9095 | -- represented as a model number. | |
9096 | ||
9097 | -- !response 84-03-17 | |
9098 | ||
9099 | -- The analysis is correct. The upper and lower bounds for | |
9100 | -- a fixed point type can lie outside the range of model | |
9101 | -- numbers. | |
9102 | ||
9103 | declare | |
9104 | Siz : Uint; | |
9105 | LBound : Ureal; | |
9106 | UBound : Ureal; | |
9107 | Bound : Ureal; | |
9108 | Max_Man : Uint; | |
9109 | ||
9110 | begin | |
9111 | LBound := Expr_Value_R (Type_Low_Bound (P_Type)); | |
9112 | UBound := Expr_Value_R (Type_High_Bound (P_Type)); | |
9113 | Bound := UR_Max (UR_Abs (LBound), UR_Abs (UBound)); | |
9114 | Max_Man := UR_Trunc (Bound / Small_Value (P_Type)); | |
9115 | ||
9116 | -- If the Bound is exactly a model number, i.e. a multiple | |
9117 | -- of Small, then we back it off by one to get the integer | |
9118 | -- value that must be representable. | |
9119 | ||
9120 | if Small_Value (P_Type) * Max_Man = Bound then | |
9121 | Max_Man := Max_Man - 1; | |
9122 | end if; | |
9123 | ||
9124 | -- Now find corresponding size = Mantissa value | |
9125 | ||
9126 | Siz := Uint_0; | |
9127 | while 2 ** Siz < Max_Man loop | |
9128 | Siz := Siz + 1; | |
9129 | end loop; | |
9130 | ||
edab6088 | 9131 | Fold_Uint (N, Siz, Static); |
996ae0b0 RK |
9132 | end; |
9133 | ||
9134 | else | |
9135 | -- The case of dynamic bounds cannot be evaluated at compile | |
9136 | -- time. Instead we use a runtime routine (see Exp_Attr). | |
9137 | ||
9138 | null; | |
9139 | end if; | |
9140 | ||
9141 | -- Floating-point Mantissa | |
9142 | ||
9143 | else | |
edab6088 | 9144 | Fold_Uint (N, Mantissa, Static); |
996ae0b0 RK |
9145 | end if; |
9146 | ||
9147 | --------- | |
9148 | -- Max -- | |
9149 | --------- | |
9150 | ||
d8f43ee6 | 9151 | when Attribute_Max => |
996ae0b0 | 9152 | if Is_Real_Type (P_Type) then |
fbf5a39b AC |
9153 | Fold_Ureal |
9154 | (N, UR_Max (Expr_Value_R (E1), Expr_Value_R (E2)), Static); | |
996ae0b0 | 9155 | else |
fbf5a39b | 9156 | Fold_Uint (N, UI_Max (Expr_Value (E1), Expr_Value (E2)), Static); |
996ae0b0 | 9157 | end if; |
996ae0b0 | 9158 | |
4adf3c50 AC |
9159 | ---------------------------------- |
9160 | -- Max_Alignment_For_Allocation -- | |
9161 | ---------------------------------- | |
9162 | ||
9163 | -- Max_Alignment_For_Allocation is usually the Alignment. However, | |
9164 | -- arrays are allocated with dope, so we need to take into account both | |
9165 | -- the alignment of the array, which comes from the component alignment, | |
9166 | -- and the alignment of the dope. Also, if the alignment is unknown, we | |
9167 | -- use the max (it's OK to be pessimistic). | |
9168 | ||
d8f43ee6 HK |
9169 | when Attribute_Max_Alignment_For_Allocation => Max_Align : declare |
9170 | A : Uint := UI_From_Int (Ttypes.Maximum_Alignment); | |
9171 | begin | |
9172 | if Known_Alignment (P_Type) | |
9173 | and then (not Is_Array_Type (P_Type) or else Alignment (P_Type) > A) | |
9174 | then | |
9175 | A := Alignment (P_Type); | |
9176 | end if; | |
4adf3c50 AC |
9177 | |
9178 | Fold_Uint (N, A, Static); | |
d8f43ee6 | 9179 | end Max_Align; |
4adf3c50 | 9180 | |
996ae0b0 RK |
9181 | ---------------------------------- |
9182 | -- Max_Size_In_Storage_Elements -- | |
9183 | ---------------------------------- | |
9184 | ||
9185 | -- Max_Size_In_Storage_Elements is simply the Size rounded up to a | |
9186 | -- Storage_Unit boundary. We can fold any cases for which the size | |
9187 | -- is known by the front end. | |
9188 | ||
9189 | when Attribute_Max_Size_In_Storage_Elements => | |
9190 | if Known_Esize (P_Type) then | |
9191 | Fold_Uint (N, | |
9192 | (Esize (P_Type) + System_Storage_Unit - 1) / | |
fbf5a39b AC |
9193 | System_Storage_Unit, |
9194 | Static); | |
996ae0b0 RK |
9195 | end if; |
9196 | ||
9197 | -------------------- | |
9198 | -- Mechanism_Code -- | |
9199 | -------------------- | |
9200 | ||
d8f43ee6 HK |
9201 | when Attribute_Mechanism_Code => Mechanism_Code : declare |
9202 | Formal : Entity_Id; | |
9203 | Mech : Mechanism_Type; | |
9204 | Val : Int; | |
996ae0b0 | 9205 | |
d8f43ee6 HK |
9206 | begin |
9207 | if No (E1) then | |
9208 | Mech := Mechanism (P_Entity); | |
996ae0b0 | 9209 | |
d8f43ee6 HK |
9210 | else |
9211 | Val := UI_To_Int (Expr_Value (E1)); | |
996ae0b0 | 9212 | |
d8f43ee6 HK |
9213 | Formal := First_Formal (P_Entity); |
9214 | for J in 1 .. Val - 1 loop | |
9215 | Next_Formal (Formal); | |
9216 | end loop; | |
996ae0b0 | 9217 | |
d8f43ee6 HK |
9218 | Mech := Mechanism (Formal); |
9219 | end if; | |
9220 | ||
9221 | if Mech < 0 then | |
9222 | Fold_Uint (N, UI_From_Int (Int (-Mech)), Static); | |
9223 | end if; | |
9224 | end Mechanism_Code; | |
996ae0b0 RK |
9225 | |
9226 | --------- | |
9227 | -- Min -- | |
9228 | --------- | |
9229 | ||
d8f43ee6 | 9230 | when Attribute_Min => |
996ae0b0 | 9231 | if Is_Real_Type (P_Type) then |
fbf5a39b AC |
9232 | Fold_Ureal |
9233 | (N, UR_Min (Expr_Value_R (E1), Expr_Value_R (E2)), Static); | |
996ae0b0 | 9234 | else |
5f3ab6fb AC |
9235 | Fold_Uint |
9236 | (N, UI_Min (Expr_Value (E1), Expr_Value (E2)), Static); | |
996ae0b0 | 9237 | end if; |
996ae0b0 | 9238 | |
5f3ab6fb AC |
9239 | --------- |
9240 | -- Mod -- | |
9241 | --------- | |
9242 | ||
9243 | when Attribute_Mod => | |
9244 | Fold_Uint | |
9245 | (N, UI_Mod (Expr_Value (E1), Modulus (P_Base_Type)), Static); | |
9246 | ||
996ae0b0 RK |
9247 | ----------- |
9248 | -- Model -- | |
9249 | ----------- | |
9250 | ||
9251 | when Attribute_Model => | |
af31bd57 AC |
9252 | Fold_Ureal |
9253 | (N, Eval_Fat.Model (P_Base_Type, Expr_Value_R (E1)), Static); | |
996ae0b0 RK |
9254 | |
9255 | ---------------- | |
9256 | -- Model_Emin -- | |
9257 | ---------------- | |
9258 | ||
9259 | when Attribute_Model_Emin => | |
d32e3cee | 9260 | Fold_Uint (N, Model_Emin_Value (P_Base_Type), Static); |
996ae0b0 RK |
9261 | |
9262 | ------------------- | |
9263 | -- Model_Epsilon -- | |
9264 | ------------------- | |
9265 | ||
9266 | when Attribute_Model_Epsilon => | |
d32e3cee | 9267 | Fold_Ureal (N, Model_Epsilon_Value (P_Base_Type), Static); |
996ae0b0 RK |
9268 | |
9269 | -------------------- | |
9270 | -- Model_Mantissa -- | |
9271 | -------------------- | |
9272 | ||
9273 | when Attribute_Model_Mantissa => | |
d32e3cee | 9274 | Fold_Uint (N, Model_Mantissa_Value (P_Base_Type), Static); |
996ae0b0 RK |
9275 | |
9276 | ----------------- | |
9277 | -- Model_Small -- | |
9278 | ----------------- | |
9279 | ||
9280 | when Attribute_Model_Small => | |
d32e3cee | 9281 | Fold_Ureal (N, Model_Small_Value (P_Base_Type), Static); |
996ae0b0 RK |
9282 | |
9283 | ------------- | |
9284 | -- Modulus -- | |
9285 | ------------- | |
9286 | ||
9287 | when Attribute_Modulus => | |
edab6088 | 9288 | Fold_Uint (N, Modulus (P_Type), Static); |
996ae0b0 RK |
9289 | |
9290 | -------------------- | |
9291 | -- Null_Parameter -- | |
9292 | -------------------- | |
9293 | ||
9294 | -- Cannot fold, we know the value sort of, but the whole point is | |
9295 | -- that there is no way to talk about this imaginary value except | |
9296 | -- by using the attribute, so we leave it the way it is. | |
9297 | ||
9298 | when Attribute_Null_Parameter => | |
9299 | null; | |
9300 | ||
9301 | ----------------- | |
9302 | -- Object_Size -- | |
9303 | ----------------- | |
9304 | ||
9305 | -- The Object_Size attribute for a type returns the Esize of the | |
9306 | -- type and can be folded if this value is known. | |
9307 | ||
9308 | when Attribute_Object_Size => Object_Size : declare | |
9309 | P_TypeA : constant Entity_Id := Underlying_Type (P_Type); | |
9310 | ||
9311 | begin | |
9312 | if Known_Esize (P_TypeA) then | |
edab6088 | 9313 | Fold_Uint (N, Esize (P_TypeA), Static); |
996ae0b0 RK |
9314 | end if; |
9315 | end Object_Size; | |
9316 | ||
2d42e881 ES |
9317 | ---------------------- |
9318 | -- Overlaps_Storage -- | |
9319 | ---------------------- | |
9320 | ||
9321 | when Attribute_Overlaps_Storage => | |
9322 | null; | |
9323 | ||
996ae0b0 RK |
9324 | ------------------------- |
9325 | -- Passed_By_Reference -- | |
9326 | ------------------------- | |
9327 | ||
9328 | -- Scalar types are never passed by reference | |
9329 | ||
9330 | when Attribute_Passed_By_Reference => | |
edab6088 | 9331 | Fold_Uint (N, False_Value, Static); |
996ae0b0 RK |
9332 | |
9333 | --------- | |
9334 | -- Pos -- | |
9335 | --------- | |
9336 | ||
9337 | when Attribute_Pos => | |
edab6088 | 9338 | Fold_Uint (N, Expr_Value (E1), Static); |
996ae0b0 RK |
9339 | |
9340 | ---------- | |
9341 | -- Pred -- | |
9342 | ---------- | |
9343 | ||
d8f43ee6 HK |
9344 | when Attribute_Pred => |
9345 | ||
fbf5a39b | 9346 | -- Floating-point case |
996ae0b0 | 9347 | |
fbf5a39b | 9348 | if Is_Floating_Point_Type (P_Type) then |
af31bd57 AC |
9349 | Fold_Ureal |
9350 | (N, Eval_Fat.Pred (P_Base_Type, Expr_Value_R (E1)), Static); | |
996ae0b0 | 9351 | |
fbf5a39b | 9352 | -- Fixed-point case |
996ae0b0 | 9353 | |
fbf5a39b | 9354 | elsif Is_Fixed_Point_Type (P_Type) then |
af31bd57 AC |
9355 | Fold_Ureal |
9356 | (N, Expr_Value_R (E1) - Small_Value (P_Type), True); | |
996ae0b0 | 9357 | |
fbf5a39b | 9358 | -- Modular integer case (wraps) |
996ae0b0 | 9359 | |
fbf5a39b AC |
9360 | elsif Is_Modular_Integer_Type (P_Type) then |
9361 | Fold_Uint (N, (Expr_Value (E1) - 1) mod Modulus (P_Type), Static); | |
996ae0b0 | 9362 | |
fbf5a39b | 9363 | -- Other scalar cases |
996ae0b0 | 9364 | |
fbf5a39b AC |
9365 | else |
9366 | pragma Assert (Is_Scalar_Type (P_Type)); | |
996ae0b0 | 9367 | |
fbf5a39b AC |
9368 | if Is_Enumeration_Type (P_Type) |
9369 | and then Expr_Value (E1) = | |
9370 | Expr_Value (Type_Low_Bound (P_Base_Type)) | |
9371 | then | |
9372 | Apply_Compile_Time_Constraint_Error | |
9373 | (N, "Pred of `&''First`", | |
9374 | CE_Overflow_Check_Failed, | |
9375 | Ent => P_Base_Type, | |
9376 | Warn => not Static); | |
996ae0b0 | 9377 | |
fbf5a39b AC |
9378 | Check_Expressions; |
9379 | return; | |
996ae0b0 | 9380 | end if; |
fbf5a39b AC |
9381 | |
9382 | Fold_Uint (N, Expr_Value (E1) - 1, Static); | |
996ae0b0 | 9383 | end if; |
996ae0b0 RK |
9384 | |
9385 | ----------- | |
9386 | -- Range -- | |
9387 | ----------- | |
9388 | ||
9389 | -- No processing required, because by this stage, Range has been | |
9390 | -- replaced by First .. Last, so this branch can never be taken. | |
9391 | ||
9392 | when Attribute_Range => | |
9393 | raise Program_Error; | |
9394 | ||
9395 | ------------------ | |
9396 | -- Range_Length -- | |
9397 | ------------------ | |
9398 | ||
d8f43ee6 HK |
9399 | when Attribute_Range_Length => Range_Length : declare |
9400 | Diff : aliased Uint; | |
9401 | ||
9402 | begin | |
996ae0b0 RK |
9403 | Set_Bounds; |
9404 | ||
af02a866 RD |
9405 | -- Can fold if both bounds are compile time known |
9406 | ||
996ae0b0 RK |
9407 | if Compile_Time_Known_Value (Hi_Bound) |
9408 | and then Compile_Time_Known_Value (Lo_Bound) | |
9409 | then | |
9410 | Fold_Uint (N, | |
9411 | UI_Max | |
fbf5a39b AC |
9412 | (0, Expr_Value (Hi_Bound) - Expr_Value (Lo_Bound) + 1), |
9413 | Static); | |
996ae0b0 RK |
9414 | end if; |
9415 | ||
af02a866 RD |
9416 | -- One more case is where Hi_Bound and Lo_Bound are compile-time |
9417 | -- comparable, and we can figure out the difference between them. | |
9418 | ||
d8f43ee6 | 9419 | case Compile_Time_Compare |
af02a866 | 9420 | (Lo_Bound, Hi_Bound, Diff'Access, Assume_Valid => False) |
d8f43ee6 HK |
9421 | is |
9422 | when EQ => | |
9423 | Fold_Uint (N, Uint_1, Static); | |
af02a866 | 9424 | |
d8f43ee6 HK |
9425 | when GT => |
9426 | Fold_Uint (N, Uint_0, Static); | |
af02a866 | 9427 | |
d8f43ee6 HK |
9428 | when LT => |
9429 | if Diff /= No_Uint then | |
9430 | Fold_Uint (N, Diff + 1, Static); | |
9431 | end if; | |
af02a866 | 9432 | |
d8f43ee6 HK |
9433 | when others => |
9434 | null; | |
9435 | end case; | |
9436 | end Range_Length; | |
af02a866 | 9437 | |
46202729 AC |
9438 | --------- |
9439 | -- Ref -- | |
9440 | --------- | |
9441 | ||
9442 | when Attribute_Ref => | |
edab6088 | 9443 | Fold_Uint (N, Expr_Value (E1), Static); |
46202729 | 9444 | |
996ae0b0 RK |
9445 | --------------- |
9446 | -- Remainder -- | |
9447 | --------------- | |
9448 | ||
82c80734 RD |
9449 | when Attribute_Remainder => Remainder : declare |
9450 | X : constant Ureal := Expr_Value_R (E1); | |
9451 | Y : constant Ureal := Expr_Value_R (E2); | |
9452 | ||
9453 | begin | |
9454 | if UR_Is_Zero (Y) then | |
9455 | Apply_Compile_Time_Constraint_Error | |
9456 | (N, "division by zero in Remainder", | |
9457 | CE_Overflow_Check_Failed, | |
9458 | Warn => not Static); | |
9459 | ||
9460 | Check_Expressions; | |
9461 | return; | |
9462 | end if; | |
9463 | ||
7b55fea6 | 9464 | Fold_Ureal (N, Eval_Fat.Remainder (P_Base_Type, X, Y), Static); |
82c80734 | 9465 | end Remainder; |
996ae0b0 | 9466 | |
2cbac6c6 AC |
9467 | ----------------- |
9468 | -- Restriction -- | |
9469 | ----------------- | |
9470 | ||
d8f43ee6 | 9471 | when Attribute_Restriction_Set => |
2cbac6c6 AC |
9472 | Rewrite (N, New_Occurrence_Of (Standard_False, Loc)); |
9473 | Set_Is_Static_Expression (N); | |
2cbac6c6 | 9474 | |
996ae0b0 RK |
9475 | ----------- |
9476 | -- Round -- | |
9477 | ----------- | |
9478 | ||
d8f43ee6 | 9479 | when Attribute_Round => Round : declare |
996ae0b0 RK |
9480 | Sr : Ureal; |
9481 | Si : Uint; | |
9482 | ||
9483 | begin | |
fbf5a39b | 9484 | -- First we get the (exact result) in units of small |
996ae0b0 | 9485 | |
fbf5a39b | 9486 | Sr := Expr_Value_R (E1) / Small_Value (C_Type); |
996ae0b0 | 9487 | |
fbf5a39b | 9488 | -- Now round that exactly to an integer |
996ae0b0 | 9489 | |
fbf5a39b | 9490 | Si := UR_To_Uint (Sr); |
996ae0b0 | 9491 | |
fbf5a39b | 9492 | -- Finally the result is obtained by converting back to real |
996ae0b0 | 9493 | |
fbf5a39b | 9494 | Fold_Ureal (N, Si * Small_Value (C_Type), Static); |
996ae0b0 RK |
9495 | end Round; |
9496 | ||
9497 | -------------- | |
9498 | -- Rounding -- | |
9499 | -------------- | |
9500 | ||
9501 | when Attribute_Rounding => | |
af31bd57 AC |
9502 | Fold_Ureal |
9503 | (N, Eval_Fat.Rounding (P_Base_Type, Expr_Value_R (E1)), Static); | |
996ae0b0 RK |
9504 | |
9505 | --------------- | |
9506 | -- Safe_Emax -- | |
9507 | --------------- | |
9508 | ||
9509 | when Attribute_Safe_Emax => | |
d32e3cee | 9510 | Fold_Uint (N, Safe_Emax_Value (P_Type), Static); |
996ae0b0 RK |
9511 | |
9512 | ---------------- | |
9513 | -- Safe_First -- | |
9514 | ---------------- | |
9515 | ||
9516 | when Attribute_Safe_First => | |
d32e3cee | 9517 | Fold_Ureal (N, Safe_First_Value (P_Type), Static); |
996ae0b0 RK |
9518 | |
9519 | ---------------- | |
9520 | -- Safe_Large -- | |
9521 | ---------------- | |
9522 | ||
9523 | when Attribute_Safe_Large => | |
9524 | if Is_Fixed_Point_Type (P_Type) then | |
fbf5a39b AC |
9525 | Fold_Ureal |
9526 | (N, Expr_Value_R (Type_High_Bound (P_Base_Type)), Static); | |
996ae0b0 | 9527 | else |
d32e3cee | 9528 | Fold_Ureal (N, Safe_Last_Value (P_Type), Static); |
996ae0b0 RK |
9529 | end if; |
9530 | ||
9531 | --------------- | |
9532 | -- Safe_Last -- | |
9533 | --------------- | |
9534 | ||
9535 | when Attribute_Safe_Last => | |
d32e3cee | 9536 | Fold_Ureal (N, Safe_Last_Value (P_Type), Static); |
996ae0b0 RK |
9537 | |
9538 | ---------------- | |
9539 | -- Safe_Small -- | |
9540 | ---------------- | |
9541 | ||
9542 | when Attribute_Safe_Small => | |
9543 | ||
9544 | -- In Ada 95, the old Ada 83 attribute Safe_Small is redundant | |
9545 | -- for fixed-point, since is the same as Small, but we implement | |
9546 | -- it for backwards compatibility. | |
9547 | ||
9548 | if Is_Fixed_Point_Type (P_Type) then | |
fbf5a39b | 9549 | Fold_Ureal (N, Small_Value (P_Type), Static); |
996ae0b0 RK |
9550 | |
9551 | -- Ada 83 Safe_Small for floating-point cases | |
9552 | ||
9553 | else | |
d32e3cee | 9554 | Fold_Ureal (N, Model_Small_Value (P_Type), Static); |
996ae0b0 RK |
9555 | end if; |
9556 | ||
9557 | ----------- | |
9558 | -- Scale -- | |
9559 | ----------- | |
9560 | ||
9561 | when Attribute_Scale => | |
edab6088 | 9562 | Fold_Uint (N, Scale_Value (P_Type), Static); |
996ae0b0 RK |
9563 | |
9564 | ------------- | |
9565 | -- Scaling -- | |
9566 | ------------- | |
9567 | ||
9568 | when Attribute_Scaling => | |
af31bd57 AC |
9569 | Fold_Ureal |
9570 | (N, | |
9571 | Eval_Fat.Scaling | |
9572 | (P_Base_Type, Expr_Value_R (E1), Expr_Value (E2)), | |
9573 | Static); | |
996ae0b0 RK |
9574 | |
9575 | ------------------ | |
9576 | -- Signed_Zeros -- | |
9577 | ------------------ | |
9578 | ||
9579 | when Attribute_Signed_Zeros => | |
9580 | Fold_Uint | |
b887f1a0 | 9581 | (N, UI_From_Int (Boolean'Pos (Has_Signed_Zeros (P_Type))), Static); |
996ae0b0 RK |
9582 | |
9583 | ---------- | |
9584 | -- Size -- | |
9585 | ---------- | |
9586 | ||
9587 | -- Size attribute returns the RM size. All scalar types can be folded, | |
9588 | -- as well as any types for which the size is known by the front end, | |
edab6088 RD |
9589 | -- including any type for which a size attribute is specified. This is |
9590 | -- one of the places where it is annoying that a size of zero means two | |
9591 | -- things (zero size for scalars, unspecified size for non-scalars). | |
996ae0b0 | 9592 | |
d8f43ee6 HK |
9593 | when Attribute_Size |
9594 | | Attribute_VADS_Size | |
9595 | => | |
9596 | Size : declare | |
9597 | P_TypeA : constant Entity_Id := Underlying_Type (P_Type); | |
996ae0b0 | 9598 | |
d8f43ee6 HK |
9599 | begin |
9600 | if Is_Scalar_Type (P_TypeA) | |
9601 | or else RM_Size (P_TypeA) /= Uint_0 | |
9602 | then | |
9603 | -- VADS_Size case | |
996ae0b0 | 9604 | |
d8f43ee6 HK |
9605 | if Id = Attribute_VADS_Size or else Use_VADS_Size then |
9606 | declare | |
9607 | S : constant Node_Id := Size_Clause (P_TypeA); | |
996ae0b0 | 9608 | |
d8f43ee6 HK |
9609 | begin |
9610 | -- If a size clause applies, then use the size from it. | |
9611 | -- This is one of the rare cases where we can use the | |
9612 | -- Size_Clause field for a subtype when Has_Size_Clause | |
9613 | -- is False. Consider: | |
996ae0b0 | 9614 | |
d8f43ee6 HK |
9615 | -- type x is range 1 .. 64; |
9616 | -- for x'size use 12; | |
9617 | -- subtype y is x range 0 .. 3; | |
996ae0b0 | 9618 | |
d8f43ee6 HK |
9619 | -- Here y has a size clause inherited from x, but |
9620 | -- normally it does not apply, and y'size is 2. However, | |
9621 | -- y'VADS_Size is indeed 12 and not 2. | |
996ae0b0 | 9622 | |
d8f43ee6 HK |
9623 | if Present (S) |
9624 | and then Is_OK_Static_Expression (Expression (S)) | |
9625 | then | |
9626 | Fold_Uint (N, Expr_Value (Expression (S)), Static); | |
996ae0b0 | 9627 | |
d8f43ee6 HK |
9628 | -- If no size is specified, then we simply use the object |
9629 | -- size in the VADS_Size case (e.g. Natural'Size is equal | |
9630 | -- to Integer'Size, not one less). | |
996ae0b0 | 9631 | |
d8f43ee6 HK |
9632 | else |
9633 | Fold_Uint (N, Esize (P_TypeA), Static); | |
9634 | end if; | |
9635 | end; | |
996ae0b0 | 9636 | |
d8f43ee6 | 9637 | -- Normal case (Size) in which case we want the RM_Size |
996ae0b0 | 9638 | |
d8f43ee6 HK |
9639 | else |
9640 | Fold_Uint (N, RM_Size (P_TypeA), Static); | |
9641 | end if; | |
996ae0b0 | 9642 | end if; |
d8f43ee6 | 9643 | end Size; |
996ae0b0 RK |
9644 | |
9645 | ----------- | |
9646 | -- Small -- | |
9647 | ----------- | |
9648 | ||
9649 | when Attribute_Small => | |
9650 | ||
12a13f01 | 9651 | -- The floating-point case is present only for Ada 83 compatibility. |
996ae0b0 RK |
9652 | -- Note that strictly this is an illegal addition, since we are |
9653 | -- extending an Ada 95 defined attribute, but we anticipate an | |
9654 | -- ARG ruling that will permit this. | |
9655 | ||
9656 | if Is_Floating_Point_Type (P_Type) then | |
9657 | ||
9658 | -- Ada 83 attribute is defined as (RM83 3.5.8) | |
9659 | ||
9660 | -- T'Small = 2.0**(-T'Emax - 1) | |
9661 | ||
9662 | -- where | |
9663 | ||
9664 | -- T'Emax = 4 * T'Mantissa | |
9665 | ||
fbf5a39b | 9666 | Fold_Ureal (N, Ureal_2 ** ((-(4 * Mantissa)) - 1), Static); |
996ae0b0 RK |
9667 | |
9668 | -- Normal Ada 95 fixed-point case | |
9669 | ||
9670 | else | |
fbf5a39b | 9671 | Fold_Ureal (N, Small_Value (P_Type), True); |
996ae0b0 RK |
9672 | end if; |
9673 | ||
82c80734 RD |
9674 | ----------------- |
9675 | -- Stream_Size -- | |
9676 | ----------------- | |
9677 | ||
9678 | when Attribute_Stream_Size => | |
9679 | null; | |
9680 | ||
996ae0b0 RK |
9681 | ---------- |
9682 | -- Succ -- | |
9683 | ---------- | |
9684 | ||
d8f43ee6 | 9685 | when Attribute_Succ => |
fbf5a39b | 9686 | -- Floating-point case |
996ae0b0 | 9687 | |
fbf5a39b | 9688 | if Is_Floating_Point_Type (P_Type) then |
af31bd57 AC |
9689 | Fold_Ureal |
9690 | (N, Eval_Fat.Succ (P_Base_Type, Expr_Value_R (E1)), Static); | |
996ae0b0 | 9691 | |
fbf5a39b | 9692 | -- Fixed-point case |
996ae0b0 | 9693 | |
fbf5a39b | 9694 | elsif Is_Fixed_Point_Type (P_Type) then |
af31bd57 | 9695 | Fold_Ureal (N, Expr_Value_R (E1) + Small_Value (P_Type), Static); |
996ae0b0 | 9696 | |
fbf5a39b | 9697 | -- Modular integer case (wraps) |
996ae0b0 | 9698 | |
fbf5a39b AC |
9699 | elsif Is_Modular_Integer_Type (P_Type) then |
9700 | Fold_Uint (N, (Expr_Value (E1) + 1) mod Modulus (P_Type), Static); | |
996ae0b0 | 9701 | |
fbf5a39b | 9702 | -- Other scalar cases |
996ae0b0 | 9703 | |
fbf5a39b AC |
9704 | else |
9705 | pragma Assert (Is_Scalar_Type (P_Type)); | |
996ae0b0 | 9706 | |
fbf5a39b AC |
9707 | if Is_Enumeration_Type (P_Type) |
9708 | and then Expr_Value (E1) = | |
9709 | Expr_Value (Type_High_Bound (P_Base_Type)) | |
9710 | then | |
9711 | Apply_Compile_Time_Constraint_Error | |
9712 | (N, "Succ of `&''Last`", | |
9713 | CE_Overflow_Check_Failed, | |
9714 | Ent => P_Base_Type, | |
9715 | Warn => not Static); | |
996ae0b0 | 9716 | |
fbf5a39b AC |
9717 | Check_Expressions; |
9718 | return; | |
9719 | else | |
9720 | Fold_Uint (N, Expr_Value (E1) + 1, Static); | |
996ae0b0 RK |
9721 | end if; |
9722 | end if; | |
996ae0b0 RK |
9723 | |
9724 | ---------------- | |
9725 | -- Truncation -- | |
9726 | ---------------- | |
9727 | ||
9728 | when Attribute_Truncation => | |
af31bd57 AC |
9729 | Fold_Ureal |
9730 | (N, | |
9731 | Eval_Fat.Truncation (P_Base_Type, Expr_Value_R (E1)), | |
9732 | Static); | |
996ae0b0 RK |
9733 | |
9734 | ---------------- | |
9735 | -- Type_Class -- | |
9736 | ---------------- | |
9737 | ||
9738 | when Attribute_Type_Class => Type_Class : declare | |
9739 | Typ : constant Entity_Id := Underlying_Type (P_Base_Type); | |
9740 | Id : RE_Id; | |
9741 | ||
9742 | begin | |
d9d25d04 | 9743 | if Is_Descendant_Of_Address (Typ) then |
996ae0b0 RK |
9744 | Id := RE_Type_Class_Address; |
9745 | ||
9746 | elsif Is_Enumeration_Type (Typ) then | |
9747 | Id := RE_Type_Class_Enumeration; | |
9748 | ||
9749 | elsif Is_Integer_Type (Typ) then | |
9750 | Id := RE_Type_Class_Integer; | |
9751 | ||
9752 | elsif Is_Fixed_Point_Type (Typ) then | |
9753 | Id := RE_Type_Class_Fixed_Point; | |
9754 | ||
9755 | elsif Is_Floating_Point_Type (Typ) then | |
9756 | Id := RE_Type_Class_Floating_Point; | |
9757 | ||
9758 | elsif Is_Array_Type (Typ) then | |
9759 | Id := RE_Type_Class_Array; | |
9760 | ||
9761 | elsif Is_Record_Type (Typ) then | |
9762 | Id := RE_Type_Class_Record; | |
9763 | ||
9764 | elsif Is_Access_Type (Typ) then | |
9765 | Id := RE_Type_Class_Access; | |
9766 | ||
996ae0b0 RK |
9767 | elsif Is_Task_Type (Typ) then |
9768 | Id := RE_Type_Class_Task; | |
9769 | ||
9770 | -- We treat protected types like task types. It would make more | |
9771 | -- sense to have another enumeration value, but after all the | |
9772 | -- whole point of this feature is to be exactly DEC compatible, | |
12a13f01 | 9773 | -- and changing the type Type_Class would not meet this requirement. |
996ae0b0 RK |
9774 | |
9775 | elsif Is_Protected_Type (Typ) then | |
9776 | Id := RE_Type_Class_Task; | |
9777 | ||
9778 | -- Not clear if there are any other possibilities, but if there | |
9779 | -- are, then we will treat them as the address case. | |
9780 | ||
9781 | else | |
9782 | Id := RE_Type_Class_Address; | |
9783 | end if; | |
9784 | ||
9785 | Rewrite (N, New_Occurrence_Of (RTE (Id), Loc)); | |
996ae0b0 RK |
9786 | end Type_Class; |
9787 | ||
9788 | ----------------------- | |
9789 | -- Unbiased_Rounding -- | |
9790 | ----------------------- | |
9791 | ||
9792 | when Attribute_Unbiased_Rounding => | |
af31bd57 AC |
9793 | Fold_Ureal |
9794 | (N, | |
9795 | Eval_Fat.Unbiased_Rounding (P_Base_Type, Expr_Value_R (E1)), | |
9796 | Static); | |
fbf5a39b AC |
9797 | |
9798 | ------------------------- | |
9799 | -- Unconstrained_Array -- | |
9800 | ------------------------- | |
9801 | ||
9802 | when Attribute_Unconstrained_Array => Unconstrained_Array : declare | |
9803 | Typ : constant Entity_Id := Underlying_Type (P_Type); | |
9804 | ||
9805 | begin | |
aa720a54 AC |
9806 | Rewrite (N, New_Occurrence_Of ( |
9807 | Boolean_Literals ( | |
9808 | Is_Array_Type (P_Type) | |
9809 | and then not Is_Constrained (Typ)), Loc)); | |
996ae0b0 | 9810 | |
fbf5a39b AC |
9811 | -- Analyze and resolve as boolean, note that this attribute is |
9812 | -- a static attribute in GNAT. | |
9813 | ||
9814 | Analyze_And_Resolve (N, Standard_Boolean); | |
9815 | Static := True; | |
edab6088 | 9816 | Set_Is_Static_Expression (N, True); |
fbf5a39b AC |
9817 | end Unconstrained_Array; |
9818 | ||
18a2ad5d AC |
9819 | -- Attribute Update is never static |
9820 | ||
18a2ad5d | 9821 | when Attribute_Update => |
08cd7c2f | 9822 | return; |
18a2ad5d | 9823 | |
996ae0b0 RK |
9824 | --------------- |
9825 | -- VADS_Size -- | |
9826 | --------------- | |
9827 | ||
9828 | -- Processing is shared with Size | |
9829 | ||
9830 | --------- | |
9831 | -- Val -- | |
9832 | --------- | |
9833 | ||
d8f43ee6 | 9834 | when Attribute_Val => |
fbf5a39b AC |
9835 | if Expr_Value (E1) < Expr_Value (Type_Low_Bound (P_Base_Type)) |
9836 | or else | |
9837 | Expr_Value (E1) > Expr_Value (Type_High_Bound (P_Base_Type)) | |
9838 | then | |
9839 | Apply_Compile_Time_Constraint_Error | |
9840 | (N, "Val expression out of range", | |
9841 | CE_Range_Check_Failed, | |
9842 | Warn => not Static); | |
9843 | ||
9844 | Check_Expressions; | |
9845 | return; | |
9846 | ||
9847 | else | |
9848 | Fold_Uint (N, Expr_Value (E1), Static); | |
996ae0b0 | 9849 | end if; |
996ae0b0 RK |
9850 | |
9851 | ---------------- | |
9852 | -- Value_Size -- | |
9853 | ---------------- | |
9854 | ||
edab6088 RD |
9855 | -- The Value_Size attribute for a type returns the RM size of the type. |
9856 | -- This an always be folded for scalar types, and can also be folded for | |
9857 | -- non-scalar types if the size is set. This is one of the places where | |
9858 | -- it is annoying that a size of zero means two things! | |
996ae0b0 RK |
9859 | |
9860 | when Attribute_Value_Size => Value_Size : declare | |
9861 | P_TypeA : constant Entity_Id := Underlying_Type (P_Type); | |
d8f43ee6 | 9862 | |
996ae0b0 | 9863 | begin |
edab6088 RD |
9864 | if Is_Scalar_Type (P_TypeA) or else RM_Size (P_TypeA) /= Uint_0 then |
9865 | Fold_Uint (N, RM_Size (P_TypeA), Static); | |
996ae0b0 | 9866 | end if; |
996ae0b0 RK |
9867 | end Value_Size; |
9868 | ||
9869 | ------------- | |
9870 | -- Version -- | |
9871 | ------------- | |
9872 | ||
9873 | -- Version can never be static | |
9874 | ||
9875 | when Attribute_Version => | |
9876 | null; | |
9877 | ||
9878 | ---------------- | |
9879 | -- Wide_Image -- | |
9880 | ---------------- | |
9881 | ||
9882 | -- Wide_Image is a scalar attribute, but is never static, because it | |
9883 | -- is not a static function (having a non-scalar argument (RM 4.9(22)) | |
9884 | ||
9885 | when Attribute_Wide_Image => | |
9886 | null; | |
9887 | ||
82c80734 RD |
9888 | --------------------- |
9889 | -- Wide_Wide_Image -- | |
9890 | --------------------- | |
9891 | ||
9892 | -- Wide_Wide_Image is a scalar attribute but is never static, because it | |
9893 | -- is not a static function (having a non-scalar argument (RM 4.9(22)). | |
9894 | ||
9895 | when Attribute_Wide_Wide_Image => | |
9896 | null; | |
9897 | ||
9898 | --------------------- | |
9899 | -- Wide_Wide_Width -- | |
9900 | --------------------- | |
9901 | ||
9902 | -- Processing for Wide_Wide_Width is combined with Width | |
9903 | ||
996ae0b0 RK |
9904 | ---------------- |
9905 | -- Wide_Width -- | |
9906 | ---------------- | |
9907 | ||
9908 | -- Processing for Wide_Width is combined with Width | |
9909 | ||
9910 | ----------- | |
9911 | -- Width -- | |
9912 | ----------- | |
9913 | ||
82c80734 | 9914 | -- This processing also handles the case of Wide_[Wide_]Width |
996ae0b0 | 9915 | |
d8f43ee6 HK |
9916 | when Attribute_Width |
9917 | | Attribute_Wide_Width | |
9918 | | Attribute_Wide_Wide_Width | |
9919 | => | |
fbf5a39b | 9920 | if Compile_Time_Known_Bounds (P_Type) then |
996ae0b0 RK |
9921 | |
9922 | -- Floating-point types | |
9923 | ||
9924 | if Is_Floating_Point_Type (P_Type) then | |
9925 | ||
9926 | -- Width is zero for a null range (RM 3.5 (38)) | |
9927 | ||
9928 | if Expr_Value_R (Type_High_Bound (P_Type)) < | |
9929 | Expr_Value_R (Type_Low_Bound (P_Type)) | |
9930 | then | |
edab6088 | 9931 | Fold_Uint (N, Uint_0, Static); |
996ae0b0 RK |
9932 | |
9933 | else | |
9934 | -- For floating-point, we have +N.dddE+nnn where length | |
9935 | -- of ddd is determined by type'Digits - 1, but is one | |
9936 | -- if Digits is one (RM 3.5 (33)). | |
9937 | ||
9938 | -- nnn is set to 2 for Short_Float and Float (32 bit | |
9939 | -- floats), and 3 for Long_Float and Long_Long_Float. | |
b8dc622e JM |
9940 | -- For machines where Long_Long_Float is the IEEE |
9941 | -- extended precision type, the exponent takes 4 digits. | |
996ae0b0 RK |
9942 | |
9943 | declare | |
9944 | Len : Int := | |
9945 | Int'Max (2, UI_To_Int (Digits_Value (P_Type))); | |
9946 | ||
9947 | begin | |
9948 | if Esize (P_Type) <= 32 then | |
9949 | Len := Len + 6; | |
b8dc622e | 9950 | elsif Esize (P_Type) = 64 then |
996ae0b0 | 9951 | Len := Len + 7; |
b8dc622e JM |
9952 | else |
9953 | Len := Len + 8; | |
996ae0b0 RK |
9954 | end if; |
9955 | ||
edab6088 | 9956 | Fold_Uint (N, UI_From_Int (Len), Static); |
996ae0b0 RK |
9957 | end; |
9958 | end if; | |
9959 | ||
9960 | -- Fixed-point types | |
9961 | ||
9962 | elsif Is_Fixed_Point_Type (P_Type) then | |
9963 | ||
9964 | -- Width is zero for a null range (RM 3.5 (38)) | |
9965 | ||
9966 | if Expr_Value (Type_High_Bound (P_Type)) < | |
9967 | Expr_Value (Type_Low_Bound (P_Type)) | |
9968 | then | |
edab6088 | 9969 | Fold_Uint (N, Uint_0, Static); |
996ae0b0 RK |
9970 | |
9971 | -- The non-null case depends on the specific real type | |
9972 | ||
9973 | else | |
9974 | -- For fixed-point type width is Fore + 1 + Aft (RM 3.5(34)) | |
9975 | ||
fbf5a39b | 9976 | Fold_Uint |
5087048c | 9977 | (N, UI_From_Int (Fore_Value + 1) + Aft_Value (P_Type), |
edab6088 | 9978 | Static); |
996ae0b0 RK |
9979 | end if; |
9980 | ||
9981 | -- Discrete types | |
9982 | ||
9983 | else | |
9984 | declare | |
9985 | R : constant Entity_Id := Root_Type (P_Type); | |
21d27997 RD |
9986 | Lo : constant Uint := Expr_Value (Type_Low_Bound (P_Type)); |
9987 | Hi : constant Uint := Expr_Value (Type_High_Bound (P_Type)); | |
996ae0b0 RK |
9988 | W : Nat; |
9989 | Wt : Nat; | |
9990 | T : Uint; | |
9991 | L : Node_Id; | |
9992 | C : Character; | |
9993 | ||
9994 | begin | |
9995 | -- Empty ranges | |
9996 | ||
9997 | if Lo > Hi then | |
9998 | W := 0; | |
9999 | ||
10000 | -- Width for types derived from Standard.Character | |
82c80734 | 10001 | -- and Standard.Wide_[Wide_]Character. |
996ae0b0 | 10002 | |
21d27997 | 10003 | elsif Is_Standard_Character_Type (P_Type) then |
996ae0b0 RK |
10004 | W := 0; |
10005 | ||
10006 | -- Set W larger if needed | |
10007 | ||
10008 | for J in UI_To_Int (Lo) .. UI_To_Int (Hi) loop | |
10009 | ||
edd63e9b | 10010 | -- All wide characters look like Hex_hhhhhhhh |
82c80734 | 10011 | |
996ae0b0 | 10012 | if J > 255 then |
39486058 | 10013 | |
a90bd866 | 10014 | -- No need to compute this more than once |
39486058 | 10015 | |
39486058 | 10016 | exit; |
996ae0b0 RK |
10017 | |
10018 | else | |
10019 | C := Character'Val (J); | |
10020 | ||
10021 | -- Test for all cases where Character'Image | |
10022 | -- yields an image that is longer than three | |
10023 | -- characters. First the cases of Reserved_xxx | |
10024 | -- names (length = 12). | |
10025 | ||
10026 | case C is | |
d8f43ee6 HK |
10027 | when Reserved_128 |
10028 | | Reserved_129 | |
10029 | | Reserved_132 | |
10030 | | Reserved_153 | |
10031 | => | |
10032 | Wt := 12; | |
10033 | ||
10034 | when BS | |
10035 | | CR | |
10036 | | EM | |
10037 | | FF | |
10038 | | FS | |
10039 | | GS | |
10040 | | HT | |
10041 | | LF | |
10042 | | MW | |
10043 | | PM | |
10044 | | RI | |
10045 | | RS | |
10046 | | SI | |
10047 | | SO | |
10048 | | ST | |
10049 | | US | |
10050 | | VT | |
10051 | => | |
10052 | Wt := 2; | |
10053 | ||
10054 | when ACK | |
10055 | | APC | |
10056 | | BEL | |
10057 | | BPH | |
10058 | | CAN | |
10059 | | CCH | |
10060 | | CSI | |
10061 | | DC1 | |
10062 | | DC2 | |
10063 | | DC3 | |
10064 | | DC4 | |
10065 | | DCS | |
10066 | | DEL | |
10067 | | DLE | |
10068 | | ENQ | |
10069 | | EOT | |
10070 | | EPA | |
10071 | | ESA | |
10072 | | ESC | |
10073 | | ETB | |
10074 | | ETX | |
10075 | | HTJ | |
10076 | | HTS | |
10077 | | NAK | |
10078 | | NBH | |
10079 | | NEL | |
10080 | | NUL | |
10081 | | OSC | |
10082 | | PLD | |
10083 | | PLU | |
10084 | | PU1 | |
10085 | | PU2 | |
10086 | | SCI | |
10087 | | SOH | |
10088 | | SOS | |
10089 | | SPA | |
10090 | | SS2 | |
10091 | | SS3 | |
10092 | | SSA | |
10093 | | STS | |
10094 | | STX | |
10095 | | SUB | |
10096 | | SYN | |
10097 | | VTS | |
10098 | => | |
10099 | Wt := 3; | |
10100 | ||
10101 | when Space .. Tilde | |
10102 | | No_Break_Space .. LC_Y_Diaeresis | |
10103 | => | |
3786bbd1 RD |
10104 | -- Special case of soft hyphen in Ada 2005 |
10105 | ||
10106 | if C = Character'Val (16#AD#) | |
0791fbe9 | 10107 | and then Ada_Version >= Ada_2005 |
3786bbd1 RD |
10108 | then |
10109 | Wt := 11; | |
10110 | else | |
10111 | Wt := 3; | |
10112 | end if; | |
996ae0b0 RK |
10113 | end case; |
10114 | ||
10115 | W := Int'Max (W, Wt); | |
10116 | end if; | |
10117 | end loop; | |
10118 | ||
10119 | -- Width for types derived from Standard.Boolean | |
10120 | ||
10121 | elsif R = Standard_Boolean then | |
10122 | if Lo = 0 then | |
10123 | W := 5; -- FALSE | |
10124 | else | |
10125 | W := 4; -- TRUE | |
10126 | end if; | |
10127 | ||
10128 | -- Width for integer types | |
10129 | ||
10130 | elsif Is_Integer_Type (P_Type) then | |
10131 | T := UI_Max (abs Lo, abs Hi); | |
10132 | ||
10133 | W := 2; | |
10134 | while T >= 10 loop | |
10135 | W := W + 1; | |
10136 | T := T / 10; | |
10137 | end loop; | |
10138 | ||
8a06151a RD |
10139 | -- User declared enum type with discard names |
10140 | ||
10141 | elsif Discard_Names (R) then | |
10142 | ||
10143 | -- If range is null, result is zero, that has already | |
10144 | -- been dealt with, so what we need is the power of ten | |
2d249f52 | 10145 | -- that accommodates the Pos of the largest value, which |
8a06151a RD |
10146 | -- is the high bound of the range + one for the space. |
10147 | ||
10148 | W := 1; | |
10149 | T := Hi; | |
10150 | while T /= 0 loop | |
10151 | T := T / 10; | |
10152 | W := W + 1; | |
10153 | end loop; | |
10154 | ||
996ae0b0 | 10155 | -- Only remaining possibility is user declared enum type |
8a06151a | 10156 | -- with normal case of Discard_Names not active. |
996ae0b0 RK |
10157 | |
10158 | else | |
10159 | pragma Assert (Is_Enumeration_Type (P_Type)); | |
10160 | ||
10161 | W := 0; | |
10162 | L := First_Literal (P_Type); | |
996ae0b0 RK |
10163 | while Present (L) loop |
10164 | ||
10165 | -- Only pay attention to in range characters | |
10166 | ||
10167 | if Lo <= Enumeration_Pos (L) | |
10168 | and then Enumeration_Pos (L) <= Hi | |
10169 | then | |
10170 | -- For Width case, use decoded name | |
10171 | ||
10172 | if Id = Attribute_Width then | |
10173 | Get_Decoded_Name_String (Chars (L)); | |
10174 | Wt := Nat (Name_Len); | |
10175 | ||
82c80734 RD |
10176 | -- For Wide_[Wide_]Width, use encoded name, and |
10177 | -- then adjust for the encoding. | |
996ae0b0 RK |
10178 | |
10179 | else | |
10180 | Get_Name_String (Chars (L)); | |
10181 | ||
10182 | -- Character literals are always of length 3 | |
10183 | ||
10184 | if Name_Buffer (1) = 'Q' then | |
10185 | Wt := 3; | |
10186 | ||
10187 | -- Otherwise loop to adjust for upper/wide chars | |
10188 | ||
10189 | else | |
10190 | Wt := Nat (Name_Len); | |
10191 | ||
10192 | for J in 1 .. Name_Len loop | |
10193 | if Name_Buffer (J) = 'U' then | |
10194 | Wt := Wt - 2; | |
10195 | elsif Name_Buffer (J) = 'W' then | |
10196 | Wt := Wt - 4; | |
10197 | end if; | |
10198 | end loop; | |
10199 | end if; | |
10200 | end if; | |
10201 | ||
10202 | W := Int'Max (W, Wt); | |
10203 | end if; | |
10204 | ||
10205 | Next_Literal (L); | |
10206 | end loop; | |
10207 | end if; | |
10208 | ||
edab6088 | 10209 | Fold_Uint (N, UI_From_Int (W), Static); |
996ae0b0 RK |
10210 | end; |
10211 | end if; | |
10212 | end if; | |
996ae0b0 | 10213 | |
4adf3c50 | 10214 | -- The following attributes denote functions that cannot be folded |
54838d1f | 10215 | |
d8f43ee6 HK |
10216 | when Attribute_From_Any |
10217 | | Attribute_To_Any | |
10218 | | Attribute_TypeCode | |
10219 | => | |
54838d1f AC |
10220 | null; |
10221 | ||
996ae0b0 RK |
10222 | -- The following attributes can never be folded, and furthermore we |
10223 | -- should not even have entered the case statement for any of these. | |
10224 | -- Note that in some cases, the values have already been folded as | |
21db8699 RD |
10225 | -- a result of the processing in Analyze_Attribute or earlier in |
10226 | -- this procedure. | |
996ae0b0 | 10227 | |
d8f43ee6 HK |
10228 | when Attribute_Abort_Signal |
10229 | | Attribute_Access | |
10230 | | Attribute_Address | |
10231 | | Attribute_Address_Size | |
10232 | | Attribute_Asm_Input | |
10233 | | Attribute_Asm_Output | |
10234 | | Attribute_Base | |
10235 | | Attribute_Bit_Order | |
10236 | | Attribute_Bit_Position | |
10237 | | Attribute_Callable | |
10238 | | Attribute_Caller | |
10239 | | Attribute_Class | |
10240 | | Attribute_Code_Address | |
10241 | | Attribute_Compiler_Version | |
10242 | | Attribute_Count | |
10243 | | Attribute_Default_Bit_Order | |
10244 | | Attribute_Default_Scalar_Storage_Order | |
10245 | | Attribute_Deref | |
10246 | | Attribute_Elaborated | |
10247 | | Attribute_Elab_Body | |
10248 | | Attribute_Elab_Spec | |
10249 | | Attribute_Elab_Subp_Body | |
10250 | | Attribute_Enabled | |
10251 | | Attribute_External_Tag | |
10252 | | Attribute_Fast_Math | |
10253 | | Attribute_First_Bit | |
10254 | | Attribute_Img | |
10255 | | Attribute_Input | |
10256 | | Attribute_Last_Bit | |
10257 | | Attribute_Library_Level | |
10258 | | Attribute_Maximum_Alignment | |
10259 | | Attribute_Old | |
10260 | | Attribute_Output | |
10261 | | Attribute_Partition_ID | |
10262 | | Attribute_Pool_Address | |
10263 | | Attribute_Position | |
10264 | | Attribute_Priority | |
10265 | | Attribute_Read | |
10266 | | Attribute_Result | |
10267 | | Attribute_Scalar_Storage_Order | |
10268 | | Attribute_Simple_Storage_Pool | |
10269 | | Attribute_Storage_Pool | |
10270 | | Attribute_Storage_Size | |
10271 | | Attribute_Storage_Unit | |
10272 | | Attribute_Stub_Type | |
10273 | | Attribute_System_Allocator_Alignment | |
10274 | | Attribute_Tag | |
10275 | | Attribute_Target_Name | |
10276 | | Attribute_Terminated | |
10277 | | Attribute_To_Address | |
10278 | | Attribute_Type_Key | |
10279 | | Attribute_Unchecked_Access | |
10280 | | Attribute_Universal_Literal_String | |
10281 | | Attribute_Unrestricted_Access | |
10282 | | Attribute_Valid | |
10283 | | Attribute_Valid_Scalars | |
10284 | | Attribute_Value | |
10285 | | Attribute_Wchar_T_Size | |
10286 | | Attribute_Wide_Value | |
10287 | | Attribute_Wide_Wide_Value | |
10288 | | Attribute_Word_Size | |
10289 | | Attribute_Write | |
10290 | => | |
996ae0b0 | 10291 | raise Program_Error; |
996ae0b0 RK |
10292 | end case; |
10293 | ||
10294 | -- At the end of the case, one more check. If we did a static evaluation | |
10295 | -- so that the result is now a literal, then set Is_Static_Expression | |
10296 | -- in the constant only if the prefix type is a static subtype. For | |
10297 | -- non-static subtypes, the folding is still OK, but not static. | |
10298 | ||
fbf5a39b AC |
10299 | -- An exception is the GNAT attribute Constrained_Array which is |
10300 | -- defined to be a static attribute in all cases. | |
10301 | ||
e10dab7f JM |
10302 | if Nkind_In (N, N_Integer_Literal, |
10303 | N_Real_Literal, | |
10304 | N_Character_Literal, | |
10305 | N_String_Literal) | |
996ae0b0 RK |
10306 | or else (Is_Entity_Name (N) |
10307 | and then Ekind (Entity (N)) = E_Enumeration_Literal) | |
10308 | then | |
10309 | Set_Is_Static_Expression (N, Static); | |
10310 | ||
10311 | -- If this is still an attribute reference, then it has not been folded | |
10312 | -- and that means that its expressions are in a non-static context. | |
10313 | ||
10314 | elsif Nkind (N) = N_Attribute_Reference then | |
10315 | Check_Expressions; | |
10316 | ||
10317 | -- Note: the else case not covered here are odd cases where the | |
10318 | -- processing has transformed the attribute into something other | |
10319 | -- than a constant. Nothing more to do in such cases. | |
10320 | ||
10321 | else | |
10322 | null; | |
10323 | end if; | |
996ae0b0 RK |
10324 | end Eval_Attribute; |
10325 | ||
10326 | ------------------------------ | |
10327 | -- Is_Anonymous_Tagged_Base -- | |
10328 | ------------------------------ | |
10329 | ||
10330 | function Is_Anonymous_Tagged_Base | |
10331 | (Anon : Entity_Id; | |
155562cb | 10332 | Typ : Entity_Id) return Boolean |
996ae0b0 RK |
10333 | is |
10334 | begin | |
10335 | return | |
10336 | Anon = Current_Scope | |
10337 | and then Is_Itype (Anon) | |
10338 | and then Associated_Node_For_Itype (Anon) = Parent (Typ); | |
10339 | end Is_Anonymous_Tagged_Base; | |
10340 | ||
442ade9d RD |
10341 | -------------------------------- |
10342 | -- Name_Implies_Lvalue_Prefix -- | |
10343 | -------------------------------- | |
822033eb | 10344 | |
442ade9d | 10345 | function Name_Implies_Lvalue_Prefix (Nam : Name_Id) return Boolean is |
822033eb HK |
10346 | pragma Assert (Is_Attribute_Name (Nam)); |
10347 | begin | |
442ade9d RD |
10348 | return Attribute_Name_Implies_Lvalue_Prefix (Get_Attribute_Id (Nam)); |
10349 | end Name_Implies_Lvalue_Prefix; | |
822033eb | 10350 | |
996ae0b0 RK |
10351 | ----------------------- |
10352 | -- Resolve_Attribute -- | |
10353 | ----------------------- | |
10354 | ||
10355 | procedure Resolve_Attribute (N : Node_Id; Typ : Entity_Id) is | |
10356 | Loc : constant Source_Ptr := Sloc (N); | |
10357 | P : constant Node_Id := Prefix (N); | |
10358 | Aname : constant Name_Id := Attribute_Name (N); | |
10359 | Attr_Id : constant Attribute_Id := Get_Attribute_Id (Aname); | |
fbf5a39b | 10360 | Btyp : constant Entity_Id := Base_Type (Typ); |
468c6c8a | 10361 | Des_Btyp : Entity_Id; |
996ae0b0 RK |
10362 | Index : Interp_Index; |
10363 | It : Interp; | |
996ae0b0 RK |
10364 | Nom_Subt : Entity_Id; |
10365 | ||
f529bac5 ES |
10366 | procedure Accessibility_Message; |
10367 | -- Error, or warning within an instance, if the static accessibility | |
10368 | -- rules of 3.10.2 are violated. | |
10369 | ||
46413d9e AC |
10370 | function Declared_Within_Generic_Unit |
10371 | (Entity : Entity_Id; | |
10372 | Generic_Unit : Node_Id) return Boolean; | |
10373 | -- Returns True if Declared_Entity is declared within the declarative | |
10374 | -- region of Generic_Unit; otherwise returns False. | |
10375 | ||
f529bac5 ES |
10376 | --------------------------- |
10377 | -- Accessibility_Message -- | |
10378 | --------------------------- | |
10379 | ||
10380 | procedure Accessibility_Message is | |
10381 | Indic : Node_Id := Parent (Parent (N)); | |
10382 | ||
10383 | begin | |
10384 | -- In an instance, this is a runtime check, but one we | |
10385 | -- know will fail, so generate an appropriate warning. | |
10386 | ||
10387 | if In_Instance_Body then | |
43417b90 | 10388 | Error_Msg_Warn := SPARK_Mode /= On; |
822033eb | 10389 | Error_Msg_F |
4a28b181 AC |
10390 | ("non-local pointer cannot point to local object<<", P); |
10391 | Error_Msg_F ("\Program_Error [<<", P); | |
f529bac5 ES |
10392 | Rewrite (N, |
10393 | Make_Raise_Program_Error (Loc, | |
10394 | Reason => PE_Accessibility_Check_Failed)); | |
10395 | Set_Etype (N, Typ); | |
10396 | return; | |
10397 | ||
10398 | else | |
ed2233dc | 10399 | Error_Msg_F ("non-local pointer cannot point to local object", P); |
f529bac5 ES |
10400 | |
10401 | -- Check for case where we have a missing access definition | |
10402 | ||
10403 | if Is_Record_Type (Current_Scope) | |
10404 | and then | |
e10dab7f JM |
10405 | Nkind_In (Parent (N), N_Discriminant_Association, |
10406 | N_Index_Or_Discriminant_Constraint) | |
f529bac5 ES |
10407 | then |
10408 | Indic := Parent (Parent (N)); | |
10409 | while Present (Indic) | |
10410 | and then Nkind (Indic) /= N_Subtype_Indication | |
10411 | loop | |
10412 | Indic := Parent (Indic); | |
10413 | end loop; | |
10414 | ||
10415 | if Present (Indic) then | |
10416 | Error_Msg_NE | |
10417 | ("\use an access definition for" & | |
822033eb HK |
10418 | " the access discriminant of&", |
10419 | N, Entity (Subtype_Mark (Indic))); | |
f529bac5 ES |
10420 | end if; |
10421 | end if; | |
10422 | end if; | |
10423 | end Accessibility_Message; | |
10424 | ||
46413d9e AC |
10425 | ---------------------------------- |
10426 | -- Declared_Within_Generic_Unit -- | |
10427 | ---------------------------------- | |
10428 | ||
10429 | function Declared_Within_Generic_Unit | |
10430 | (Entity : Entity_Id; | |
10431 | Generic_Unit : Node_Id) return Boolean | |
10432 | is | |
10433 | Generic_Encloser : Node_Id := Enclosing_Generic_Unit (Entity); | |
10434 | ||
10435 | begin | |
10436 | while Present (Generic_Encloser) loop | |
10437 | if Generic_Encloser = Generic_Unit then | |
10438 | return True; | |
10439 | end if; | |
10440 | ||
10441 | -- We have to step to the scope of the generic's entity, because | |
10442 | -- otherwise we'll just get back the same generic. | |
10443 | ||
10444 | Generic_Encloser := | |
10445 | Enclosing_Generic_Unit | |
10446 | (Scope (Defining_Entity (Generic_Encloser))); | |
10447 | end loop; | |
10448 | ||
10449 | return False; | |
10450 | end Declared_Within_Generic_Unit; | |
10451 | ||
f529bac5 ES |
10452 | -- Start of processing for Resolve_Attribute |
10453 | ||
996ae0b0 | 10454 | begin |
3b42c566 RD |
10455 | -- If error during analysis, no point in continuing, except for array |
10456 | -- types, where we get better recovery by using unconstrained indexes | |
10457 | -- than nothing at all (see Check_Array_Type). | |
996ae0b0 RK |
10458 | |
10459 | if Error_Posted (N) | |
10460 | and then Attr_Id /= Attribute_First | |
10461 | and then Attr_Id /= Attribute_Last | |
10462 | and then Attr_Id /= Attribute_Length | |
10463 | and then Attr_Id /= Attribute_Range | |
10464 | then | |
10465 | return; | |
10466 | end if; | |
10467 | ||
10468 | -- If attribute was universal type, reset to actual type | |
10469 | ||
10470 | if Etype (N) = Universal_Integer | |
10471 | or else Etype (N) = Universal_Real | |
10472 | then | |
10473 | Set_Etype (N, Typ); | |
10474 | end if; | |
10475 | ||
10476 | -- Remaining processing depends on attribute | |
10477 | ||
10478 | case Attr_Id is | |
10479 | ||
10480 | ------------ | |
10481 | -- Access -- | |
10482 | ------------ | |
10483 | ||
10484 | -- For access attributes, if the prefix denotes an entity, it is | |
10485 | -- interpreted as a name, never as a call. It may be overloaded, | |
10486 | -- in which case resolution uses the profile of the context type. | |
10487 | -- Otherwise prefix must be resolved. | |
10488 | ||
10489 | when Attribute_Access | |
10490 | | Attribute_Unchecked_Access | |
d8f43ee6 HK |
10491 | | Attribute_Unrestricted_Access |
10492 | => | |
91669e7e AC |
10493 | -- Note possible modification if we have a variable |
10494 | ||
996ae0b0 | 10495 | if Is_Variable (P) then |
91669e7e AC |
10496 | declare |
10497 | PN : constant Node_Id := Parent (N); | |
10498 | Nm : Node_Id; | |
10499 | ||
10500 | Note : Boolean := True; | |
10501 | -- Skip this for the case of Unrestricted_Access occuring in | |
10502 | -- the context of a Valid check, since this otherwise leads | |
10503 | -- to a missed warning (the Valid check does not really | |
10504 | -- modify!) If this case, Note will be reset to False. | |
10505 | ||
16b54914 | 10506 | -- Skip it as well if the type is an Access_To_Constant, |
81501d2b AC |
10507 | -- given that no use of the value can modify the prefix. |
10508 | ||
91669e7e AC |
10509 | begin |
10510 | if Attr_Id = Attribute_Unrestricted_Access | |
10511 | and then Nkind (PN) = N_Function_Call | |
10512 | then | |
10513 | Nm := Name (PN); | |
10514 | ||
10515 | if Nkind (Nm) = N_Expanded_Name | |
10516 | and then Chars (Nm) = Name_Valid | |
10517 | and then Nkind (Prefix (Nm)) = N_Identifier | |
10518 | and then Chars (Prefix (Nm)) = Name_Attr_Long_Float | |
10519 | then | |
10520 | Note := False; | |
10521 | end if; | |
81501d2b AC |
10522 | |
10523 | elsif Is_Access_Constant (Typ) then | |
10524 | Note := False; | |
91669e7e AC |
10525 | end if; |
10526 | ||
10527 | if Note then | |
10528 | Note_Possible_Modification (P, Sure => False); | |
10529 | end if; | |
10530 | end; | |
996ae0b0 RK |
10531 | end if; |
10532 | ||
b07b7ace AC |
10533 | -- The following comes from a query concerning improper use of |
10534 | -- universal_access in equality tests involving anonymous access | |
10535 | -- types. Another good reason for 'Ref, but for now disable the | |
10536 | -- test, which breaks several filed tests??? | |
8d9509fd ES |
10537 | |
10538 | if Ekind (Typ) = E_Anonymous_Access_Type | |
10539 | and then Nkind_In (Parent (N), N_Op_Eq, N_Op_Ne) | |
10540 | and then False | |
10541 | then | |
10542 | Error_Msg_N ("need unique type to resolve 'Access", N); | |
10543 | Error_Msg_N ("\qualify attribute with some access type", N); | |
10544 | end if; | |
10545 | ||
b07b7ace AC |
10546 | -- Case where prefix is an entity name |
10547 | ||
996ae0b0 | 10548 | if Is_Entity_Name (P) then |
b07b7ace AC |
10549 | |
10550 | -- Deal with case where prefix itself is overloaded | |
10551 | ||
996ae0b0 RK |
10552 | if Is_Overloaded (P) then |
10553 | Get_First_Interp (P, Index, It); | |
996ae0b0 | 10554 | while Present (It.Nam) loop |
996ae0b0 RK |
10555 | if Type_Conformant (Designated_Type (Typ), It.Nam) then |
10556 | Set_Entity (P, It.Nam); | |
10557 | ||
fea9e956 ES |
10558 | -- The prefix is definitely NOT overloaded anymore at |
10559 | -- this point, so we reset the Is_Overloaded flag to | |
10560 | -- avoid any confusion when reanalyzing the node. | |
996ae0b0 RK |
10561 | |
10562 | Set_Is_Overloaded (P, False); | |
fea9e956 | 10563 | Set_Is_Overloaded (N, False); |
996ae0b0 RK |
10564 | Generate_Reference (Entity (P), P); |
10565 | exit; | |
10566 | end if; | |
10567 | ||
10568 | Get_Next_Interp (Index, It); | |
10569 | end loop; | |
10570 | ||
16e764a7 | 10571 | -- If Prefix is a subprogram name, this reference freezes, |
6dc87f5f AC |
10572 | -- but not if within spec expression mode. The profile of |
10573 | -- the subprogram is not frozen at this point. | |
16e764a7 AC |
10574 | |
10575 | if not In_Spec_Expression then | |
b1d8d229 | 10576 | Freeze_Before (N, Entity (P), Do_Freeze_Profile => False); |
16e764a7 | 10577 | end if; |
442ade9d | 10578 | |
6dc87f5f AC |
10579 | -- If it is a type, there is nothing to resolve. |
10580 | -- If it is a subprogram, do not freeze its profile. | |
10581 | -- If it is an object, complete its resolution. | |
996ae0b0 | 10582 | |
fea9e956 | 10583 | elsif Is_Overloadable (Entity (P)) then |
21d27997 | 10584 | if not In_Spec_Expression then |
b1d8d229 | 10585 | Freeze_Before (N, Entity (P), Do_Freeze_Profile => False); |
fea9e956 ES |
10586 | end if; |
10587 | ||
b07b7ace AC |
10588 | -- Nothing to do if prefix is a type name |
10589 | ||
fea9e956 ES |
10590 | elsif Is_Type (Entity (P)) then |
10591 | null; | |
b07b7ace AC |
10592 | |
10593 | -- Otherwise non-overloaded other case, resolve the prefix | |
10594 | ||
fea9e956 | 10595 | else |
fbf5a39b | 10596 | Resolve (P); |
996ae0b0 RK |
10597 | end if; |
10598 | ||
b07b7ace AC |
10599 | -- Some further error checks |
10600 | ||
12e0c41c AC |
10601 | Error_Msg_Name_1 := Aname; |
10602 | ||
996ae0b0 RK |
10603 | if not Is_Entity_Name (P) then |
10604 | null; | |
10605 | ||
fea9e956 ES |
10606 | elsif Is_Overloadable (Entity (P)) |
10607 | and then Is_Abstract_Subprogram (Entity (P)) | |
996ae0b0 | 10608 | then |
822033eb | 10609 | Error_Msg_F ("prefix of % attribute cannot be abstract", P); |
996ae0b0 RK |
10610 | Set_Etype (N, Any_Type); |
10611 | ||
53f697ee AC |
10612 | elsif Ekind (Entity (P)) = E_Enumeration_Literal then |
10613 | Error_Msg_F | |
d7cb47b4 | 10614 | ("prefix of % attribute cannot be enumeration literal", P); |
53f697ee | 10615 | Set_Etype (N, Any_Type); |
996ae0b0 | 10616 | |
53f697ee AC |
10617 | -- An attempt to take 'Access of a function that renames an |
10618 | -- enumeration literal. Issue a specialized error message. | |
10619 | ||
10620 | elsif Ekind (Entity (P)) = E_Function | |
10621 | and then Present (Alias (Entity (P))) | |
10622 | and then Ekind (Alias (Entity (P))) = E_Enumeration_Literal | |
10623 | then | |
10624 | Error_Msg_F | |
d7cb47b4 AC |
10625 | ("prefix of % attribute cannot be function renaming " |
10626 | & "an enumeration literal", P); | |
53f697ee AC |
10627 | Set_Etype (N, Any_Type); |
10628 | ||
10629 | elsif Convention (Entity (P)) = Convention_Intrinsic then | |
d7cb47b4 | 10630 | Error_Msg_F ("prefix of % attribute cannot be intrinsic", P); |
996ae0b0 RK |
10631 | Set_Etype (N, Any_Type); |
10632 | end if; | |
10633 | ||
10634 | -- Assignments, return statements, components of aggregates, | |
10635 | -- generic instantiations will require convention checks if | |
10636 | -- the type is an access to subprogram. Given that there will | |
10637 | -- also be accessibility checks on those, this is where the | |
10638 | -- checks can eventually be centralized ??? | |
10639 | ||
b6e6a4e3 AC |
10640 | if Ekind_In (Btyp, E_Access_Protected_Subprogram_Type, |
10641 | E_Access_Subprogram_Type, | |
10642 | E_Anonymous_Access_Protected_Subprogram_Type, | |
10643 | E_Anonymous_Access_Subprogram_Type) | |
af4b9434 | 10644 | then |
822033eb HK |
10645 | -- Deal with convention mismatch |
10646 | ||
1a265e78 AC |
10647 | if Convention (Designated_Type (Btyp)) /= |
10648 | Convention (Entity (P)) | |
10649 | then | |
b619c88e AC |
10650 | -- The rule in 6.3.1 (8) deserves a special error |
10651 | -- message. | |
10652 | ||
10653 | if Convention (Btyp) = Convention_Intrinsic | |
10654 | and then Nkind (Parent (N)) = N_Procedure_Call_Statement | |
10655 | and then Is_Entity_Name (Name (Parent (N))) | |
10656 | and then Inside_A_Generic | |
10657 | then | |
10658 | declare | |
10659 | Subp : constant Entity_Id := | |
10660 | Entity (Name (Parent (N))); | |
10661 | begin | |
10662 | if Convention (Subp) = Convention_Intrinsic then | |
b6e6a4e3 AC |
10663 | Error_Msg_FE |
10664 | ("?subprogram and its formal access " | |
10665 | & "parameters have convention Intrinsic", | |
10666 | Parent (N), Subp); | |
b619c88e AC |
10667 | Error_Msg_N |
10668 | ("actual cannot be access attribute", N); | |
10669 | end if; | |
10670 | end; | |
10671 | ||
10672 | else | |
10673 | Error_Msg_FE | |
10674 | ("subprogram & has wrong convention", P, Entity (P)); | |
10675 | Error_Msg_Sloc := Sloc (Btyp); | |
10676 | Error_Msg_FE ("\does not match & declared#", P, Btyp); | |
10677 | end if; | |
822033eb | 10678 | |
80c2c202 AC |
10679 | if not Is_Itype (Btyp) |
10680 | and then not Has_Convention_Pragma (Btyp) | |
10681 | then | |
822033eb HK |
10682 | Error_Msg_FE |
10683 | ("\probable missing pragma Convention for &", | |
10684 | P, Btyp); | |
10685 | end if; | |
996ae0b0 RK |
10686 | |
10687 | else | |
10688 | Check_Subtype_Conformant | |
10689 | (New_Id => Entity (P), | |
10690 | Old_Id => Designated_Type (Btyp), | |
10691 | Err_Loc => P); | |
10692 | end if; | |
10693 | ||
10694 | if Attr_Id = Attribute_Unchecked_Access then | |
10695 | Error_Msg_Name_1 := Aname; | |
822033eb | 10696 | Error_Msg_F |
996ae0b0 RK |
10697 | ("attribute% cannot be applied to a subprogram", P); |
10698 | ||
10699 | elsif Aname = Name_Unrestricted_Access then | |
10700 | null; -- Nothing to check | |
10701 | ||
b8dc622e JM |
10702 | -- Check the static accessibility rule of 3.10.2(32). |
10703 | -- This rule also applies within the private part of an | |
10704 | -- instantiation. This rule does not apply to anonymous | |
2995ebee | 10705 | -- access-to-subprogram types in access parameters. |
996ae0b0 RK |
10706 | |
10707 | elsif Attr_Id = Attribute_Access | |
b8dc622e | 10708 | and then not In_Instance_Body |
2995ebee AC |
10709 | and then |
10710 | (Ekind (Btyp) = E_Access_Subprogram_Type | |
10711 | or else Is_Local_Anonymous_Access (Btyp)) | |
af4b9434 AC |
10712 | and then Subprogram_Access_Level (Entity (P)) > |
10713 | Type_Access_Level (Btyp) | |
996ae0b0 | 10714 | then |
822033eb | 10715 | Error_Msg_F |
b8dc622e JM |
10716 | ("subprogram must not be deeper than access type", P); |
10717 | ||
10718 | -- Check the restriction of 3.10.2(32) that disallows the | |
10719 | -- access attribute within a generic body when the ultimate | |
10720 | -- ancestor of the type of the attribute is declared outside | |
10721 | -- of the generic unit and the subprogram is declared within | |
10722 | -- that generic unit. This includes any such attribute that | |
10723 | -- occurs within the body of a generic unit that is a child | |
10724 | -- of the generic unit where the subprogram is declared. | |
599a7411 | 10725 | |
12a13f01 | 10726 | -- The rule also prohibits applying the attribute when the |
b8dc622e JM |
10727 | -- access type is a generic formal access type (since the |
10728 | -- level of the actual type is not known). This restriction | |
10729 | -- does not apply when the attribute type is an anonymous | |
10730 | -- access-to-subprogram type. Note that this check was | |
46413d9e | 10731 | -- revised by AI-229, because the original Ada 95 rule |
b8dc622e JM |
10732 | -- was too lax. The original rule only applied when the |
10733 | -- subprogram was declared within the body of the generic, | |
10734 | -- which allowed the possibility of dangling references). | |
46413d9e | 10735 | -- The rule was also too strict in some cases, in that it |
b8dc622e JM |
10736 | -- didn't permit the access to be declared in the generic |
10737 | -- spec, whereas the revised rule does (as long as it's not | |
10738 | -- a formal type). | |
10739 | ||
10740 | -- There are a couple of subtleties of the test for applying | |
10741 | -- the check that are worth noting. First, we only apply it | |
10742 | -- when the levels of the subprogram and access type are the | |
10743 | -- same (the case where the subprogram is statically deeper | |
10744 | -- was applied above, and the case where the type is deeper | |
10745 | -- is always safe). Second, we want the check to apply | |
10746 | -- within nested generic bodies and generic child unit | |
10747 | -- bodies, but not to apply to an attribute that appears in | |
10748 | -- the generic unit's specification. This is done by testing | |
10749 | -- that the attribute's innermost enclosing generic body is | |
10750 | -- not the same as the innermost generic body enclosing the | |
10751 | -- generic unit where the subprogram is declared (we don't | |
10752 | -- want the check to apply when the access attribute is in | |
10753 | -- the spec and there's some other generic body enclosing | |
10754 | -- generic). Finally, there's no point applying the check | |
822033eb HK |
10755 | -- when within an instance, because any violations will have |
10756 | -- been caught by the compilation of the generic unit. | |
f529bac5 | 10757 | |
303fbb20 AC |
10758 | -- We relax this check in Relaxed_RM_Semantics mode for |
10759 | -- compatibility with legacy code for use by Ada source | |
10760 | -- code analyzers (e.g. CodePeer). | |
8cce3d75 | 10761 | |
b8dc622e | 10762 | elsif Attr_Id = Attribute_Access |
303fbb20 | 10763 | and then not Relaxed_RM_Semantics |
b8dc622e JM |
10764 | and then not In_Instance |
10765 | and then Present (Enclosing_Generic_Unit (Entity (P))) | |
10766 | and then Present (Enclosing_Generic_Body (N)) | |
10767 | and then Enclosing_Generic_Body (N) /= | |
10768 | Enclosing_Generic_Body | |
10769 | (Enclosing_Generic_Unit (Entity (P))) | |
10770 | and then Subprogram_Access_Level (Entity (P)) = | |
10771 | Type_Access_Level (Btyp) | |
10772 | and then Ekind (Btyp) /= | |
10773 | E_Anonymous_Access_Subprogram_Type | |
10774 | and then Ekind (Btyp) /= | |
10775 | E_Anonymous_Access_Protected_Subprogram_Type | |
996ae0b0 | 10776 | then |
b8dc622e JM |
10777 | -- The attribute type's ultimate ancestor must be |
10778 | -- declared within the same generic unit as the | |
46413d9e AC |
10779 | -- subprogram is declared (including within another |
10780 | -- nested generic unit). The error message is | |
8cce3d75 AC |
10781 | -- specialized to say "ancestor" for the case where the |
10782 | -- access type is not its own ancestor, since saying | |
10783 | -- simply "access type" would be very confusing. | |
b8dc622e | 10784 | |
46413d9e AC |
10785 | if not Declared_Within_Generic_Unit |
10786 | (Root_Type (Btyp), | |
10787 | Enclosing_Generic_Unit (Entity (P))) | |
b8dc622e | 10788 | then |
fea9e956 ES |
10789 | Error_Msg_N |
10790 | ("''Access attribute not allowed in generic body", | |
10791 | N); | |
10792 | ||
b8dc622e | 10793 | if Root_Type (Btyp) = Btyp then |
fea9e956 ES |
10794 | Error_Msg_NE |
10795 | ("\because " & | |
10796 | "access type & is declared outside " & | |
442ade9d | 10797 | "generic unit (RM 3.10.2(32))", N, Btyp); |
b8dc622e | 10798 | else |
fea9e956 ES |
10799 | Error_Msg_NE |
10800 | ("\because ancestor of " & | |
10801 | "access type & is declared outside " & | |
442ade9d | 10802 | "generic unit (RM 3.10.2(32))", N, Btyp); |
b8dc622e JM |
10803 | end if; |
10804 | ||
fea9e956 ES |
10805 | Error_Msg_NE |
10806 | ("\move ''Access to private part, or " & | |
10807 | "(Ada 2005) use anonymous access type instead of &", | |
10808 | N, Btyp); | |
10809 | ||
b8dc622e JM |
10810 | -- If the ultimate ancestor of the attribute's type is |
10811 | -- a formal type, then the attribute is illegal because | |
10812 | -- the actual type might be declared at a higher level. | |
10813 | -- The error message is specialized to say "ancestor" | |
10814 | -- for the case where the access type is not its own | |
10815 | -- ancestor, since saying simply "access type" would be | |
10816 | -- very confusing. | |
10817 | ||
10818 | elsif Is_Generic_Type (Root_Type (Btyp)) then | |
10819 | if Root_Type (Btyp) = Btyp then | |
10820 | Error_Msg_N | |
10821 | ("access type must not be a generic formal type", | |
10822 | N); | |
10823 | else | |
10824 | Error_Msg_N | |
10825 | ("ancestor access type must not be a generic " & | |
10826 | "formal type", N); | |
10827 | end if; | |
10828 | end if; | |
996ae0b0 RK |
10829 | end if; |
10830 | end if; | |
10831 | ||
5d09245e | 10832 | -- If this is a renaming, an inherited operation, or a |
fea9e956 ES |
10833 | -- subprogram instance, use the original entity. This may make |
10834 | -- the node type-inconsistent, so this transformation can only | |
10835 | -- be done if the node will not be reanalyzed. In particular, | |
10836 | -- if it is within a default expression, the transformation | |
10837 | -- must be delayed until the default subprogram is created for | |
10838 | -- it, when the enclosing subprogram is frozen. | |
996ae0b0 RK |
10839 | |
10840 | if Is_Entity_Name (P) | |
10841 | and then Is_Overloadable (Entity (P)) | |
10842 | and then Present (Alias (Entity (P))) | |
fea9e956 | 10843 | and then Expander_Active |
996ae0b0 RK |
10844 | then |
10845 | Rewrite (P, | |
10846 | New_Occurrence_Of (Alias (Entity (P)), Sloc (P))); | |
10847 | end if; | |
10848 | ||
10849 | elsif Nkind (P) = N_Selected_Component | |
10850 | and then Is_Overloadable (Entity (Selector_Name (P))) | |
10851 | then | |
10852 | -- Protected operation. If operation is overloaded, must | |
10853 | -- disambiguate. Prefix that denotes protected object itself | |
10854 | -- is resolved with its own type. | |
10855 | ||
10856 | if Attr_Id = Attribute_Unchecked_Access then | |
10857 | Error_Msg_Name_1 := Aname; | |
822033eb | 10858 | Error_Msg_F |
996ae0b0 RK |
10859 | ("attribute% cannot be applied to protected operation", P); |
10860 | end if; | |
10861 | ||
fbf5a39b | 10862 | Resolve (Prefix (P)); |
07fc65c4 | 10863 | Generate_Reference (Entity (Selector_Name (P)), P); |
996ae0b0 | 10864 | |
289a994b AC |
10865 | -- Implement check implied by 3.10.2 (18.1/2) : F.all'access is |
10866 | -- statically illegal if F is an anonymous access to subprogram. | |
10867 | ||
10868 | elsif Nkind (P) = N_Explicit_Dereference | |
10869 | and then Is_Entity_Name (Prefix (P)) | |
10870 | and then Ekind (Etype (Entity (Prefix (P)))) = | |
10871 | E_Anonymous_Access_Subprogram_Type | |
10872 | then | |
10873 | Error_Msg_N ("anonymous access to subprogram " | |
10874 | & "has deeper accessibility than any master", P); | |
10875 | ||
996ae0b0 RK |
10876 | elsif Is_Overloaded (P) then |
10877 | ||
5f3ab6fb AC |
10878 | -- Use the designated type of the context to disambiguate |
10879 | -- Note that this was not strictly conformant to Ada 95, | |
10880 | -- but was the implementation adopted by most Ada 95 compilers. | |
10881 | -- The use of the context type to resolve an Access attribute | |
10882 | -- reference is now mandated in AI-235 for Ada 2005. | |
5d09245e | 10883 | |
996ae0b0 RK |
10884 | declare |
10885 | Index : Interp_Index; | |
10886 | It : Interp; | |
5f3ab6fb | 10887 | |
996ae0b0 RK |
10888 | begin |
10889 | Get_First_Interp (P, Index, It); | |
996ae0b0 RK |
10890 | while Present (It.Typ) loop |
10891 | if Covers (Designated_Type (Typ), It.Typ) then | |
10892 | Resolve (P, It.Typ); | |
10893 | exit; | |
10894 | end if; | |
10895 | ||
10896 | Get_Next_Interp (Index, It); | |
10897 | end loop; | |
10898 | end; | |
10899 | else | |
fbf5a39b | 10900 | Resolve (P); |
996ae0b0 RK |
10901 | end if; |
10902 | ||
822033eb HK |
10903 | -- X'Access is illegal if X denotes a constant and the access type |
10904 | -- is access-to-variable. Same for 'Unchecked_Access. The rule | |
10905 | -- does not apply to 'Unrestricted_Access. If the reference is a | |
10906 | -- default-initialized aggregate component for a self-referential | |
10907 | -- type the reference is legal. | |
996ae0b0 RK |
10908 | |
10909 | if not (Ekind (Btyp) = E_Access_Subprogram_Type | |
af4b9434 | 10910 | or else Ekind (Btyp) = E_Anonymous_Access_Subprogram_Type |
442ade9d RD |
10911 | or else (Is_Record_Type (Btyp) |
10912 | and then | |
10913 | Present (Corresponding_Remote_Type (Btyp))) | |
996ae0b0 | 10914 | or else Ekind (Btyp) = E_Access_Protected_Subprogram_Type |
af4b9434 AC |
10915 | or else Ekind (Btyp) |
10916 | = E_Anonymous_Access_Protected_Subprogram_Type | |
996ae0b0 RK |
10917 | or else Is_Access_Constant (Btyp) |
10918 | or else Is_Variable (P) | |
10919 | or else Attr_Id = Attribute_Unrestricted_Access) | |
10920 | then | |
468c6c8a ES |
10921 | if Is_Entity_Name (P) |
10922 | and then Is_Type (Entity (P)) | |
10923 | then | |
10924 | -- Legality of a self-reference through an access | |
10925 | -- attribute has been verified in Analyze_Access_Attribute. | |
10926 | ||
10927 | null; | |
10928 | ||
10929 | elsif Comes_From_Source (N) then | |
822033eb | 10930 | Error_Msg_F ("access-to-variable designates constant", P); |
996ae0b0 RK |
10931 | end if; |
10932 | end if; | |
10933 | ||
7b76e805 RD |
10934 | Des_Btyp := Designated_Type (Btyp); |
10935 | ||
0791fbe9 | 10936 | if Ada_Version >= Ada_2005 |
7b76e805 RD |
10937 | and then Is_Incomplete_Type (Des_Btyp) |
10938 | then | |
10939 | -- Ada 2005 (AI-412): If the (sub)type is a limited view of an | |
10940 | -- imported entity, and the non-limited view is visible, make | |
10941 | -- use of it. If it is an incomplete subtype, use the base type | |
10942 | -- in any case. | |
10943 | ||
7b56a91b | 10944 | if From_Limited_With (Des_Btyp) |
7b76e805 RD |
10945 | and then Present (Non_Limited_View (Des_Btyp)) |
10946 | then | |
10947 | Des_Btyp := Non_Limited_View (Des_Btyp); | |
10948 | ||
10949 | elsif Ekind (Des_Btyp) = E_Incomplete_Subtype then | |
10950 | Des_Btyp := Etype (Des_Btyp); | |
10951 | end if; | |
10952 | end if; | |
10953 | ||
996ae0b0 RK |
10954 | if (Attr_Id = Attribute_Access |
10955 | or else | |
10956 | Attr_Id = Attribute_Unchecked_Access) | |
10957 | and then (Ekind (Btyp) = E_General_Access_Type | |
b07b7ace | 10958 | or else Ekind (Btyp) = E_Anonymous_Access_Type) |
996ae0b0 | 10959 | then |
0ab80019 | 10960 | -- Ada 2005 (AI-230): Check the accessibility of anonymous |
822033eb HK |
10961 | -- access types for stand-alone objects, record and array |
10962 | -- components, and return objects. For a component definition | |
10963 | -- the level is the same of the enclosing composite type. | |
35b7fa6a | 10964 | |
0791fbe9 | 10965 | if Ada_Version >= Ada_2005 |
d15f9422 AC |
10966 | and then (Is_Local_Anonymous_Access (Btyp) |
10967 | ||
011f9d5d AC |
10968 | -- Handle cases where Btyp is the anonymous access |
10969 | -- type of an Ada 2012 stand-alone object. | |
d15f9422 | 10970 | |
996c8821 RD |
10971 | or else Nkind (Associated_Node_For_Itype (Btyp)) = |
10972 | N_Object_Declaration) | |
011f9d5d AC |
10973 | and then |
10974 | Object_Access_Level (P) > Deepest_Type_Access_Level (Btyp) | |
468c6c8a | 10975 | and then Attr_Id = Attribute_Access |
35b7fa6a | 10976 | then |
ef1c0511 AC |
10977 | -- In an instance, this is a runtime check, but one we know |
10978 | -- will fail, so generate an appropriate warning. As usual, | |
10979 | -- this kind of warning is an error in SPARK mode. | |
35b7fa6a AC |
10980 | |
10981 | if In_Instance_Body then | |
43417b90 | 10982 | Error_Msg_Warn := SPARK_Mode /= On; |
822033eb | 10983 | Error_Msg_F |
4a28b181 AC |
10984 | ("non-local pointer cannot point to local object<<", P); |
10985 | Error_Msg_F ("\Program_Error [<<", P); | |
10986 | ||
35b7fa6a AC |
10987 | Rewrite (N, |
10988 | Make_Raise_Program_Error (Loc, | |
10989 | Reason => PE_Accessibility_Check_Failed)); | |
10990 | Set_Etype (N, Typ); | |
822033eb | 10991 | |
35b7fa6a | 10992 | else |
822033eb | 10993 | Error_Msg_F |
35b7fa6a AC |
10994 | ("non-local pointer cannot point to local object", P); |
10995 | end if; | |
10996 | end if; | |
10997 | ||
996ae0b0 | 10998 | if Is_Dependent_Component_Of_Mutable_Object (P) then |
822033eb | 10999 | Error_Msg_F |
996ae0b0 RK |
11000 | ("illegal attribute for discriminant-dependent component", |
11001 | P); | |
11002 | end if; | |
11003 | ||
442ade9d RD |
11004 | -- Check static matching rule of 3.10.2(27). Nominal subtype |
11005 | -- of the prefix must statically match the designated type. | |
996ae0b0 RK |
11006 | |
11007 | Nom_Subt := Etype (P); | |
11008 | ||
11009 | if Is_Constr_Subt_For_U_Nominal (Nom_Subt) then | |
822033eb | 11010 | Nom_Subt := Base_Type (Nom_Subt); |
996ae0b0 RK |
11011 | end if; |
11012 | ||
11013 | if Is_Tagged_Type (Designated_Type (Typ)) then | |
32213142 | 11014 | |
996ae0b0 | 11015 | -- If the attribute is in the context of an access |
3f1bc2cf AC |
11016 | -- parameter, then the prefix is allowed to be of |
11017 | -- the class-wide type (by AI-127). | |
996ae0b0 RK |
11018 | |
11019 | if Ekind (Typ) = E_Anonymous_Access_Type then | |
11020 | if not Covers (Designated_Type (Typ), Nom_Subt) | |
11021 | and then not Covers (Nom_Subt, Designated_Type (Typ)) | |
11022 | then | |
ee0a48c5 ES |
11023 | declare |
11024 | Desig : Entity_Id; | |
11025 | ||
11026 | begin | |
11027 | Desig := Designated_Type (Typ); | |
11028 | ||
11029 | if Is_Class_Wide_Type (Desig) then | |
11030 | Desig := Etype (Desig); | |
11031 | end if; | |
11032 | ||
11033 | if Is_Anonymous_Tagged_Base (Nom_Subt, Desig) then | |
11034 | null; | |
11035 | ||
11036 | else | |
822033eb | 11037 | Error_Msg_FE |
ee0a48c5 ES |
11038 | ("type of prefix: & not compatible", |
11039 | P, Nom_Subt); | |
822033eb | 11040 | Error_Msg_FE |
ee0a48c5 ES |
11041 | ("\with &, the expected designated type", |
11042 | P, Designated_Type (Typ)); | |
11043 | end if; | |
11044 | end; | |
996ae0b0 RK |
11045 | end if; |
11046 | ||
11047 | elsif not Covers (Designated_Type (Typ), Nom_Subt) | |
11048 | or else | |
11049 | (not Is_Class_Wide_Type (Designated_Type (Typ)) | |
11050 | and then Is_Class_Wide_Type (Nom_Subt)) | |
11051 | then | |
822033eb | 11052 | Error_Msg_FE |
996ae0b0 | 11053 | ("type of prefix: & is not covered", P, Nom_Subt); |
822033eb | 11054 | Error_Msg_FE |
996ae0b0 | 11055 | ("\by &, the expected designated type" & |
442ade9d | 11056 | " (RM 3.10.2 (27))", P, Designated_Type (Typ)); |
996ae0b0 RK |
11057 | end if; |
11058 | ||
11059 | if Is_Class_Wide_Type (Designated_Type (Typ)) | |
11060 | and then Has_Discriminants (Etype (Designated_Type (Typ))) | |
11061 | and then Is_Constrained (Etype (Designated_Type (Typ))) | |
11062 | and then Designated_Type (Typ) /= Nom_Subt | |
11063 | then | |
11064 | Apply_Discriminant_Check | |
11065 | (N, Etype (Designated_Type (Typ))); | |
11066 | end if; | |
11067 | ||
468c6c8a ES |
11068 | -- Ada 2005 (AI-363): Require static matching when designated |
11069 | -- type has discriminants and a constrained partial view, since | |
11070 | -- in general objects of such types are mutable, so we can't | |
11071 | -- allow the access value to designate a constrained object | |
11072 | -- (because access values must be assumed to designate mutable | |
11073 | -- objects when designated type does not impose a constraint). | |
11074 | ||
7b76e805 RD |
11075 | elsif Subtypes_Statically_Match (Des_Btyp, Nom_Subt) then |
11076 | null; | |
11077 | ||
11078 | elsif Has_Discriminants (Designated_Type (Typ)) | |
11079 | and then not Is_Constrained (Des_Btyp) | |
996ae0b0 | 11080 | and then |
0791fbe9 | 11081 | (Ada_Version < Ada_2005 |
7b76e805 | 11082 | or else |
0fbcb11c | 11083 | not Object_Type_Has_Constrained_Partial_View |
d600ef16 RD |
11084 | (Typ => Designated_Type (Base_Type (Typ)), |
11085 | Scop => Current_Scope)) | |
996ae0b0 | 11086 | then |
7b76e805 RD |
11087 | null; |
11088 | ||
11089 | else | |
822033eb | 11090 | Error_Msg_F |
996ae0b0 RK |
11091 | ("object subtype must statically match " |
11092 | & "designated subtype", P); | |
11093 | ||
11094 | if Is_Entity_Name (P) | |
11095 | and then Is_Array_Type (Designated_Type (Typ)) | |
11096 | then | |
996ae0b0 RK |
11097 | declare |
11098 | D : constant Node_Id := Declaration_Node (Entity (P)); | |
996ae0b0 | 11099 | begin |
324ac540 AC |
11100 | Error_Msg_N |
11101 | ("aliased object has explicit bounds??", D); | |
11102 | Error_Msg_N | |
11103 | ("\declare without bounds (and with explicit " | |
11104 | & "initialization)??", D); | |
11105 | Error_Msg_N | |
11106 | ("\for use with unconstrained access??", D); | |
996ae0b0 RK |
11107 | end; |
11108 | end if; | |
11109 | end if; | |
11110 | ||
83e5da69 AC |
11111 | -- Check the static accessibility rule of 3.10.2(28). Note that |
11112 | -- this check is not performed for the case of an anonymous | |
11113 | -- access type, since the access attribute is always legal | |
11114 | -- in such a context. | |
996ae0b0 RK |
11115 | |
11116 | if Attr_Id /= Attribute_Unchecked_Access | |
a7e68e7f | 11117 | and then Ekind (Btyp) = E_General_Access_Type |
f460d8f3 SB |
11118 | and then |
11119 | Object_Access_Level (P) > Deepest_Type_Access_Level (Btyp) | |
996ae0b0 | 11120 | then |
f529bac5 ES |
11121 | Accessibility_Message; |
11122 | return; | |
996ae0b0 RK |
11123 | end if; |
11124 | end if; | |
11125 | ||
e1b871e9 AC |
11126 | if Ekind_In (Btyp, E_Access_Protected_Subprogram_Type, |
11127 | E_Anonymous_Access_Protected_Subprogram_Type) | |
996ae0b0 | 11128 | then |
f529bac5 ES |
11129 | if Is_Entity_Name (P) |
11130 | and then not Is_Protected_Type (Scope (Entity (P))) | |
11131 | then | |
822033eb | 11132 | Error_Msg_F ("context requires a protected subprogram", P); |
f529bac5 | 11133 | |
442ade9d RD |
11134 | -- Check accessibility of protected object against that of the |
11135 | -- access type, but only on user code, because the expander | |
11136 | -- creates access references for handlers. If the context is an | |
11137 | -- anonymous_access_to_protected, there are no accessibility | |
11138 | -- checks either. Omit check entirely for Unrestricted_Access. | |
f529bac5 | 11139 | |
f460d8f3 | 11140 | elsif Object_Access_Level (P) > Deepest_Type_Access_Level (Btyp) |
f529bac5 ES |
11141 | and then Comes_From_Source (N) |
11142 | and then Ekind (Btyp) = E_Access_Protected_Subprogram_Type | |
822033eb | 11143 | and then Attr_Id /= Attribute_Unrestricted_Access |
f529bac5 ES |
11144 | then |
11145 | Accessibility_Message; | |
11146 | return; | |
c92e8586 AC |
11147 | |
11148 | -- AI05-0225: If the context is not an access to protected | |
11149 | -- function, the prefix must be a variable, given that it may | |
11150 | -- be used subsequently in a protected call. | |
11151 | ||
11152 | elsif Nkind (P) = N_Selected_Component | |
11153 | and then not Is_Variable (Prefix (P)) | |
11154 | and then Ekind (Entity (Selector_Name (P))) /= E_Function | |
11155 | then | |
11156 | Error_Msg_N | |
11157 | ("target object of access to protected procedure " | |
11158 | & "must be variable", N); | |
11159 | ||
11160 | elsif Is_Entity_Name (P) then | |
11161 | Check_Internal_Protected_Use (N, Entity (P)); | |
f529bac5 | 11162 | end if; |
996ae0b0 | 11163 | |
e1b871e9 AC |
11164 | elsif Ekind_In (Btyp, E_Access_Subprogram_Type, |
11165 | E_Anonymous_Access_Subprogram_Type) | |
996ae0b0 RK |
11166 | and then Ekind (Etype (N)) = E_Access_Protected_Subprogram_Type |
11167 | then | |
822033eb | 11168 | Error_Msg_F ("context requires a non-protected subprogram", P); |
996ae0b0 RK |
11169 | end if; |
11170 | ||
11171 | -- The context cannot be a pool-specific type, but this is a | |
11172 | -- legality rule, not a resolution rule, so it must be checked | |
11173 | -- separately, after possibly disambiguation (see AI-245). | |
11174 | ||
11175 | if Ekind (Btyp) = E_Access_Type | |
11176 | and then Attr_Id /= Attribute_Unrestricted_Access | |
11177 | then | |
11178 | Wrong_Type (N, Typ); | |
11179 | end if; | |
11180 | ||
822033eb HK |
11181 | -- The context may be a constrained access type (however ill- |
11182 | -- advised such subtypes might be) so in order to generate a | |
8b55e70d | 11183 | -- constraint check we need to set the type of the attribute |
822033eb HK |
11184 | -- reference to the base type of the context. |
11185 | ||
11186 | Set_Etype (N, Btyp); | |
996ae0b0 RK |
11187 | |
11188 | -- Check for incorrect atomic/volatile reference (RM C.6(12)) | |
11189 | ||
11190 | if Attr_Id /= Attribute_Unrestricted_Access then | |
11191 | if Is_Atomic_Object (P) | |
11192 | and then not Is_Atomic (Designated_Type (Typ)) | |
11193 | then | |
822033eb | 11194 | Error_Msg_F |
996ae0b0 RK |
11195 | ("access to atomic object cannot yield access-to-" & |
11196 | "non-atomic type", P); | |
11197 | ||
11198 | elsif Is_Volatile_Object (P) | |
11199 | and then not Is_Volatile (Designated_Type (Typ)) | |
11200 | then | |
822033eb | 11201 | Error_Msg_F |
996ae0b0 RK |
11202 | ("access to volatile object cannot yield access-to-" & |
11203 | "non-volatile type", P); | |
11204 | end if; | |
11205 | end if; | |
11206 | ||
2eda24e9 PMR |
11207 | -- Check for aliased view. We allow a nonaliased prefix when in |
11208 | -- an instance because the prefix may have been a tagged formal | |
11209 | -- object, which is defined to be aliased even when the actual | |
11210 | -- might not be (other instance cases will have been caught in | |
11211 | -- the generic). Similarly, within an inlined body we know that | |
11212 | -- the attribute is legal in the original subprogram, therefore | |
11213 | -- legal in the expansion. | |
11214 | ||
11215 | if not (Is_Entity_Name (P) | |
11216 | and then Is_Overloadable (Entity (P))) | |
11217 | and then not (Nkind (P) = N_Selected_Component | |
11218 | and then | |
aa11d1dd | 11219 | Is_Overloadable (Entity (Selector_Name (P)))) |
5b85ad7d | 11220 | and then not Is_Aliased_View (Original_Node (P)) |
2eda24e9 PMR |
11221 | and then not In_Instance |
11222 | and then not In_Inlined_Body | |
11223 | and then Comes_From_Source (N) | |
b07b7ace | 11224 | then |
2eda24e9 PMR |
11225 | -- Here we have a non-aliased view. This is illegal unless we |
11226 | -- have the case of Unrestricted_Access, where for now we allow | |
11227 | -- this (we will reject later if expected type is access to an | |
11228 | -- unconstrained array with a thin pointer). | |
11229 | ||
11230 | -- No need for an error message on a generated access reference | |
11231 | -- for the controlling argument in a dispatching call: error | |
11232 | -- will be reported when resolving the call. | |
11233 | ||
11234 | if Attr_Id /= Attribute_Unrestricted_Access then | |
11235 | Error_Msg_N ("prefix of % attribute must be aliased", P); | |
11236 | ||
11237 | -- Check for unrestricted access where expected type is a thin | |
11238 | -- pointer to an unconstrained array. | |
11239 | ||
11240 | elsif Has_Size_Clause (Typ) | |
11241 | and then RM_Size (Typ) = System_Address_Size | |
11242 | then | |
11243 | declare | |
11244 | DT : constant Entity_Id := Designated_Type (Typ); | |
11245 | begin | |
11246 | if Is_Array_Type (DT) | |
11247 | and then not Is_Constrained (DT) | |
11248 | then | |
11249 | Error_Msg_N | |
11250 | ("illegal use of Unrestricted_Access attribute", P); | |
11251 | Error_Msg_N | |
11252 | ("\attempt to generate thin pointer to unaliased " | |
11253 | & "object", P); | |
11254 | end if; | |
11255 | end; | |
11256 | end if; | |
b07b7ace AC |
11257 | end if; |
11258 | ||
2168d7cc AC |
11259 | -- Mark that address of entity is taken in case of |
11260 | -- 'Unrestricted_Access or in case of a subprogram. | |
b07b7ace | 11261 | |
2168d7cc | 11262 | if Is_Entity_Name (P) |
90e491a7 PMR |
11263 | and then (Attr_Id = Attribute_Unrestricted_Access |
11264 | or else Is_Subprogram (Entity (P))) | |
2168d7cc | 11265 | then |
442ade9d RD |
11266 | Set_Address_Taken (Entity (P)); |
11267 | end if; | |
113a9fb6 | 11268 | |
b8e6830b AC |
11269 | -- Deal with possible elaboration check |
11270 | ||
11271 | if Is_Entity_Name (P) and then Is_Subprogram (Entity (P)) then | |
113a9fb6 | 11272 | declare |
b8e6830b AC |
11273 | Subp_Id : constant Entity_Id := Entity (P); |
11274 | Scop : constant Entity_Id := Scope (Subp_Id); | |
11275 | Subp_Decl : constant Node_Id := | |
11276 | Unit_Declaration_Node (Subp_Id); | |
8c691dc6 AC |
11277 | Flag_Id : Entity_Id; |
11278 | Subp_Body : Node_Id; | |
113a9fb6 AC |
11279 | |
11280 | -- If the access has been taken and the body of the subprogram | |
11281 | -- has not been see yet, indirect calls must be protected with | |
11282 | -- elaboration checks. We have the proper elaboration machinery | |
11283 | -- for subprograms declared in packages, but within a block or | |
11284 | -- a subprogram the body will appear in the same declarative | |
11285 | -- part, and we must insert a check in the eventual body itself | |
11286 | -- using the elaboration flag that we generate now. The check | |
b8e6830b AC |
11287 | -- is then inserted when the body is expanded. This processing |
11288 | -- is not needed for a stand alone expression function because | |
11289 | -- the internally generated spec and body are always inserted | |
11290 | -- as a pair in the same declarative list. | |
113a9fb6 AC |
11291 | |
11292 | begin | |
b8e6830b AC |
11293 | if Expander_Active |
11294 | and then Comes_From_Source (Subp_Id) | |
113a9fb6 | 11295 | and then Comes_From_Source (N) |
b8e6830b AC |
11296 | and then In_Open_Scopes (Scop) |
11297 | and then Ekind_In (Scop, E_Block, E_Procedure, E_Function) | |
11298 | and then not Has_Completion (Subp_Id) | |
11299 | and then No (Elaboration_Entity (Subp_Id)) | |
11300 | and then Nkind (Subp_Decl) = N_Subprogram_Declaration | |
11301 | and then Nkind (Original_Node (Subp_Decl)) /= | |
11302 | N_Expression_Function | |
113a9fb6 AC |
11303 | then |
11304 | -- Create elaboration variable for it | |
11305 | ||
b8e6830b AC |
11306 | Flag_Id := Make_Temporary (Loc, 'E'); |
11307 | Set_Elaboration_Entity (Subp_Id, Flag_Id); | |
11308 | Set_Is_Frozen (Flag_Id); | |
11309 | ||
11310 | -- Insert declaration for flag after subprogram | |
11311 | -- declaration. Note that attribute reference may | |
11312 | -- appear within a nested scope. | |
11313 | ||
11314 | Insert_After_And_Analyze (Subp_Decl, | |
113a9fb6 | 11315 | Make_Object_Declaration (Loc, |
b8e6830b | 11316 | Defining_Identifier => Flag_Id, |
113a9fb6 AC |
11317 | Object_Definition => |
11318 | New_Occurrence_Of (Standard_Short_Integer, Loc), | |
11319 | Expression => | |
b8e6830b | 11320 | Make_Integer_Literal (Loc, Uint_0))); |
78645ad8 ES |
11321 | |
11322 | -- The above sets the Scope of the flag entity to the | |
11323 | -- current scope, in which the attribute appears, but | |
11324 | -- the flag declaration has been inserted after that | |
e5d16323 | 11325 | -- of Subp_Id, so the scope of the flag is the same as |
78645ad8 | 11326 | -- that of Subp_Id. This is relevant when unnesting, |
e5d16323 | 11327 | -- where processing depends on correct scope setting. |
78645ad8 ES |
11328 | |
11329 | Set_Scope (Flag_Id, Scop); | |
b8e6830b | 11330 | end if; |
f9e333ab | 11331 | |
b8e6830b AC |
11332 | -- Taking the 'Access of an expression function freezes its |
11333 | -- expression (RM 13.14 10.3/3). This does not apply to an | |
11334 | -- expression function that acts as a completion because the | |
11335 | -- generated body is immediately analyzed and the expression | |
11336 | -- is automatically frozen. | |
11337 | ||
8c691dc6 | 11338 | if Is_Expression_Function (Subp_Id) |
b8e6830b | 11339 | and then Present (Corresponding_Body (Subp_Decl)) |
b8e6830b | 11340 | then |
8c691dc6 AC |
11341 | Subp_Body := |
11342 | Unit_Declaration_Node (Corresponding_Body (Subp_Decl)); | |
b8e6830b | 11343 | |
8d1fe980 AC |
11344 | -- The body has already been analyzed when the expression |
11345 | -- function acts as a completion. | |
f9e333ab | 11346 | |
8d1fe980 AC |
11347 | if Analyzed (Subp_Body) then |
11348 | null; | |
11349 | ||
11350 | -- Attribute 'Access may appear within the generated body | |
11351 | -- of the expression function subject to the attribute: | |
11352 | ||
11353 | -- function F is (... F'Access ...); | |
11354 | ||
11355 | -- If the expression function is on the scope stack, then | |
11356 | -- the body is currently being analyzed. Do not reanalyze | |
11357 | -- it because this will lead to infinite recursion. | |
11358 | ||
11359 | elsif In_Open_Scopes (Subp_Id) then | |
11360 | null; | |
11361 | ||
72d5c70b AC |
11362 | -- If reference to the expression function appears in an |
11363 | -- inner scope, for example as an actual in an instance, | |
11364 | -- this is not a freeze point either. | |
11365 | ||
11366 | elsif Scope (Subp_Id) /= Current_Scope then | |
11367 | null; | |
11368 | ||
8d1fe980 AC |
11369 | -- Analyze the body of the expression function to freeze |
11370 | -- the expression. This takes care of the case where the | |
11371 | -- 'Access is part of dispatch table initialization and | |
11372 | -- the generated body of the expression function has not | |
11373 | -- been analyzed yet. | |
11374 | ||
11375 | else | |
8c691dc6 | 11376 | Analyze (Subp_Body); |
b8e6830b | 11377 | end if; |
113a9fb6 AC |
11378 | end if; |
11379 | end; | |
11380 | end if; | |
442ade9d | 11381 | |
996ae0b0 RK |
11382 | ------------- |
11383 | -- Address -- | |
11384 | ------------- | |
11385 | ||
11386 | -- Deal with resolving the type for Address attribute, overloading | |
11387 | -- is not permitted here, since there is no context to resolve it. | |
11388 | ||
d8f43ee6 HK |
11389 | when Attribute_Address |
11390 | | Attribute_Code_Address | |
11391 | => | |
996ae0b0 RK |
11392 | -- To be safe, assume that if the address of a variable is taken, |
11393 | -- it may be modified via this address, so note modification. | |
11394 | ||
11395 | if Is_Variable (P) then | |
21d27997 | 11396 | Note_Possible_Modification (P, Sure => False); |
996ae0b0 RK |
11397 | end if; |
11398 | ||
c4e5e10f | 11399 | if Nkind (P) in N_Subexpr |
996ae0b0 RK |
11400 | and then Is_Overloaded (P) |
11401 | then | |
11402 | Get_First_Interp (P, Index, It); | |
11403 | Get_Next_Interp (Index, It); | |
11404 | ||
11405 | if Present (It.Nam) then | |
11406 | Error_Msg_Name_1 := Aname; | |
822033eb | 11407 | Error_Msg_F |
c4e5e10f | 11408 | ("prefix of % attribute cannot be overloaded", P); |
996ae0b0 RK |
11409 | end if; |
11410 | end if; | |
11411 | ||
996ae0b0 | 11412 | if not Is_Entity_Name (P) |
442ade9d | 11413 | or else not Is_Overloadable (Entity (P)) |
996ae0b0 RK |
11414 | then |
11415 | if not Is_Task_Type (Etype (P)) | |
11416 | or else Nkind (P) = N_Explicit_Dereference | |
11417 | then | |
fbf5a39b | 11418 | Resolve (P); |
996ae0b0 RK |
11419 | end if; |
11420 | end if; | |
11421 | ||
11422 | -- If this is the name of a derived subprogram, or that of a | |
11423 | -- generic actual, the address is that of the original entity. | |
11424 | ||
11425 | if Is_Entity_Name (P) | |
11426 | and then Is_Overloadable (Entity (P)) | |
11427 | and then Present (Alias (Entity (P))) | |
11428 | then | |
11429 | Rewrite (P, | |
11430 | New_Occurrence_Of (Alias (Entity (P)), Sloc (P))); | |
11431 | end if; | |
11432 | ||
442ade9d RD |
11433 | if Is_Entity_Name (P) then |
11434 | Set_Address_Taken (Entity (P)); | |
11435 | end if; | |
bfc157d5 ES |
11436 | |
11437 | if Nkind (P) = N_Slice then | |
11438 | ||
11439 | -- Arr (X .. Y)'address is identical to Arr (X)'address, | |
11440 | -- even if the array is packed and the slice itself is not | |
11441 | -- addressable. Transform the prefix into an indexed component. | |
edde779b | 11442 | |
a66996b3 | 11443 | -- Note that the transformation is safe only if we know that |
edde779b AC |
11444 | -- the slice is non-null. That is because a null slice can have |
11445 | -- an out of bounds index value. | |
11446 | ||
4c4e9ad2 ES |
11447 | -- Right now, gigi blows up if given 'Address on a slice as a |
11448 | -- result of some incorrect freeze nodes generated by the front | |
11449 | -- end, and this covers up that bug in one case, but the bug is | |
11450 | -- likely still there in the cases not handled by this code ??? | |
edde779b AC |
11451 | |
11452 | -- It's not clear what 'Address *should* return for a null | |
11453 | -- slice with out of bounds indexes, this might be worth an ARG | |
11454 | -- discussion ??? | |
11455 | ||
11456 | -- One approach would be to do a length check unconditionally, | |
11457 | -- and then do the transformation below unconditionally, but | |
11458 | -- analyze with checks off, avoiding the problem of the out of | |
11459 | -- bounds index. This approach would interpret the address of | |
11460 | -- an out of bounds null slice as being the address where the | |
11461 | -- array element would be if there was one, which is probably | |
11462 | -- as reasonable an interpretation as any ??? | |
bfc157d5 ES |
11463 | |
11464 | declare | |
11465 | Loc : constant Source_Ptr := Sloc (P); | |
11466 | D : constant Node_Id := Discrete_Range (P); | |
11467 | Lo : Node_Id; | |
11468 | ||
11469 | begin | |
a66996b3 ES |
11470 | if Is_Entity_Name (D) |
11471 | and then | |
11472 | Not_Null_Range | |
11473 | (Type_Low_Bound (Entity (D)), | |
11474 | Type_High_Bound (Entity (D))) | |
11475 | then | |
bfc157d5 ES |
11476 | Lo := |
11477 | Make_Attribute_Reference (Loc, | |
11478 | Prefix => (New_Occurrence_Of (Entity (D), Loc)), | |
11479 | Attribute_Name => Name_First); | |
a66996b3 | 11480 | |
4c4e9ad2 ES |
11481 | elsif Nkind (D) = N_Range |
11482 | and then Not_Null_Range (Low_Bound (D), High_Bound (D)) | |
11483 | then | |
bfc157d5 | 11484 | Lo := Low_Bound (D); |
a66996b3 ES |
11485 | |
11486 | else | |
11487 | Lo := Empty; | |
bfc157d5 ES |
11488 | end if; |
11489 | ||
a66996b3 ES |
11490 | if Present (Lo) then |
11491 | Rewrite (P, | |
11492 | Make_Indexed_Component (Loc, | |
eedc5882 | 11493 | Prefix => Relocate_Node (Prefix (P)), |
a66996b3 | 11494 | Expressions => New_List (Lo))); |
bfc157d5 | 11495 | |
a66996b3 ES |
11496 | Analyze_And_Resolve (P); |
11497 | end if; | |
bfc157d5 ES |
11498 | end; |
11499 | end if; | |
442ade9d | 11500 | |
996ae0b0 RK |
11501 | ------------------ |
11502 | -- Body_Version -- | |
11503 | ------------------ | |
11504 | ||
11505 | -- Prefix of Body_Version attribute can be a subprogram name which | |
11506 | -- must not be resolved, since this is not a call. | |
11507 | ||
11508 | when Attribute_Body_Version => | |
11509 | null; | |
11510 | ||
11511 | ------------ | |
11512 | -- Caller -- | |
11513 | ------------ | |
11514 | ||
11515 | -- Prefix of Caller attribute is an entry name which must not | |
11516 | -- be resolved, since this is definitely not an entry call. | |
11517 | ||
11518 | when Attribute_Caller => | |
11519 | null; | |
11520 | ||
11521 | ------------------ | |
11522 | -- Code_Address -- | |
11523 | ------------------ | |
11524 | ||
11525 | -- Shares processing with Address attribute | |
11526 | ||
11527 | ----------- | |
11528 | -- Count -- | |
11529 | ----------- | |
11530 | ||
fbf5a39b AC |
11531 | -- If the prefix of the Count attribute is an entry name it must not |
11532 | -- be resolved, since this is definitely not an entry call. However, | |
11533 | -- if it is an element of an entry family, the index itself may | |
11534 | -- have to be resolved because it can be a general expression. | |
996ae0b0 RK |
11535 | |
11536 | when Attribute_Count => | |
fbf5a39b AC |
11537 | if Nkind (P) = N_Indexed_Component |
11538 | and then Is_Entity_Name (Prefix (P)) | |
11539 | then | |
11540 | declare | |
11541 | Indx : constant Node_Id := First (Expressions (P)); | |
11542 | Fam : constant Entity_Id := Entity (Prefix (P)); | |
11543 | begin | |
11544 | Resolve (Indx, Entry_Index_Type (Fam)); | |
11545 | Apply_Range_Check (Indx, Entry_Index_Type (Fam)); | |
11546 | end; | |
11547 | end if; | |
996ae0b0 RK |
11548 | |
11549 | ---------------- | |
11550 | -- Elaborated -- | |
11551 | ---------------- | |
11552 | ||
11553 | -- Prefix of the Elaborated attribute is a subprogram name which | |
11554 | -- must not be resolved, since this is definitely not a call. Note | |
11555 | -- that it is a library unit, so it cannot be overloaded here. | |
11556 | ||
11557 | when Attribute_Elaborated => | |
11558 | null; | |
11559 | ||
442ade9d RD |
11560 | ------------- |
11561 | -- Enabled -- | |
11562 | ------------- | |
11563 | ||
11564 | -- Prefix of Enabled attribute is a check name, which must be treated | |
11565 | -- specially and not touched by Resolve. | |
11566 | ||
11567 | when Attribute_Enabled => | |
11568 | null; | |
11569 | ||
ba08ba84 AC |
11570 | ---------------- |
11571 | -- Loop_Entry -- | |
11572 | ---------------- | |
11573 | ||
11574 | -- Do not resolve the prefix of Loop_Entry, instead wait until the | |
11575 | -- attribute has been expanded (see Expand_Loop_Entry_Attributes). | |
11576 | -- The delay ensures that any generated checks or temporaries are | |
11577 | -- inserted before the relocated prefix. | |
11578 | ||
11579 | when Attribute_Loop_Entry => | |
11580 | null; | |
11581 | ||
996ae0b0 RK |
11582 | -------------------- |
11583 | -- Mechanism_Code -- | |
11584 | -------------------- | |
11585 | ||
11586 | -- Prefix of the Mechanism_Code attribute is a function name | |
11587 | -- which must not be resolved. Should we check for overloaded ??? | |
11588 | ||
11589 | when Attribute_Mechanism_Code => | |
11590 | null; | |
11591 | ||
11592 | ------------------ | |
11593 | -- Partition_ID -- | |
11594 | ------------------ | |
11595 | ||
11596 | -- Most processing is done in sem_dist, after determining the | |
11597 | -- context type. Node is rewritten as a conversion to a runtime call. | |
11598 | ||
11599 | when Attribute_Partition_ID => | |
11600 | Process_Partition_Id (N); | |
11601 | return; | |
11602 | ||
1033834f RD |
11603 | ------------------ |
11604 | -- Pool_Address -- | |
11605 | ------------------ | |
11606 | ||
fbf5a39b AC |
11607 | when Attribute_Pool_Address => |
11608 | Resolve (P); | |
11609 | ||
996ae0b0 RK |
11610 | ----------- |
11611 | -- Range -- | |
11612 | ----------- | |
11613 | ||
c159409f AC |
11614 | -- We replace the Range attribute node with a range expression whose |
11615 | -- bounds are the 'First and 'Last attributes applied to the same | |
11616 | -- prefix. The reason that we do this transformation here instead of | |
11617 | -- in the expander is that it simplifies other parts of the semantic | |
11618 | -- analysis which assume that the Range has been replaced; thus it | |
11619 | -- must be done even when in semantic-only mode (note that the RM | |
11620 | -- specifically mentions this equivalence, we take care that the | |
11621 | -- prefix is only evaluated once). | |
996ae0b0 | 11622 | |
d8f43ee6 HK |
11623 | when Attribute_Range => Range_Attribute : declare |
11624 | Dims : List_Id; | |
11625 | HB : Node_Id; | |
11626 | LB : Node_Id; | |
996ae0b0 | 11627 | |
d8f43ee6 HK |
11628 | begin |
11629 | if not Is_Entity_Name (P) or else not Is_Type (Entity (P)) then | |
11630 | Resolve (P); | |
f56add9c BD |
11631 | |
11632 | -- If the prefix is a function call returning on the secondary | |
11633 | -- stack, we must make sure to mark/release the stack. | |
11634 | ||
11635 | if Nkind (P) = N_Function_Call | |
11636 | and then Nkind (Parent (N)) = N_Loop_Parameter_Specification | |
11637 | and then Requires_Transient_Scope (Etype (P)) | |
11638 | then | |
11639 | Set_Uses_Sec_Stack (Scope (Current_Scope)); | |
11640 | end if; | |
d8f43ee6 | 11641 | end if; |
996ae0b0 | 11642 | |
d8f43ee6 | 11643 | Dims := Expressions (N); |
ed32b82e | 11644 | |
d8f43ee6 HK |
11645 | HB := |
11646 | Make_Attribute_Reference (Loc, | |
11647 | Prefix => Duplicate_Subexpr (P, Name_Req => True), | |
11648 | Attribute_Name => Name_Last, | |
11649 | Expressions => Dims); | |
996ae0b0 | 11650 | |
d8f43ee6 HK |
11651 | LB := |
11652 | Make_Attribute_Reference (Loc, | |
11653 | Prefix => P, | |
11654 | Attribute_Name => Name_First, | |
11655 | Expressions => (Dims)); | |
ed32b82e | 11656 | |
d8f43ee6 HK |
11657 | -- Do not share the dimension indicator, if present. Even though |
11658 | -- it is a static constant, its source location may be modified | |
11659 | -- when printing expanded code and node sharing will lead to chaos | |
11660 | -- in Sprint. | |
ed32b82e | 11661 | |
d8f43ee6 HK |
11662 | if Present (Dims) then |
11663 | Set_Expressions (LB, New_List (New_Copy_Tree (First (Dims)))); | |
11664 | end if; | |
996ae0b0 | 11665 | |
d8f43ee6 HK |
11666 | -- If the original was marked as Must_Not_Freeze (see code in |
11667 | -- Sem_Ch3.Make_Index), then make sure the rewriting does not | |
11668 | -- freeze either. | |
996ae0b0 | 11669 | |
d8f43ee6 HK |
11670 | if Must_Not_Freeze (N) then |
11671 | Set_Must_Not_Freeze (HB); | |
11672 | Set_Must_Not_Freeze (LB); | |
11673 | Set_Must_Not_Freeze (Prefix (HB)); | |
11674 | Set_Must_Not_Freeze (Prefix (LB)); | |
11675 | end if; | |
996ae0b0 | 11676 | |
d8f43ee6 | 11677 | if Raises_Constraint_Error (Prefix (N)) then |
996ae0b0 | 11678 | |
d8f43ee6 HK |
11679 | -- Preserve Sloc of prefix in the new bounds, so that the |
11680 | -- posted warning can be removed if we are within unreachable | |
11681 | -- code. | |
996ae0b0 | 11682 | |
d8f43ee6 HK |
11683 | Set_Sloc (LB, Sloc (Prefix (N))); |
11684 | Set_Sloc (HB, Sloc (Prefix (N))); | |
11685 | end if; | |
996ae0b0 | 11686 | |
d8f43ee6 HK |
11687 | Rewrite (N, Make_Range (Loc, LB, HB)); |
11688 | Analyze_And_Resolve (N, Typ); | |
996ae0b0 | 11689 | |
d8f43ee6 | 11690 | -- Ensure that the expanded range does not have side effects |
25e29378 | 11691 | |
d8f43ee6 HK |
11692 | Force_Evaluation (LB); |
11693 | Force_Evaluation (HB); | |
25e29378 | 11694 | |
d8f43ee6 HK |
11695 | -- Normally after resolving attribute nodes, Eval_Attribute |
11696 | -- is called to do any possible static evaluation of the node. | |
11697 | -- However, here since the Range attribute has just been | |
11698 | -- transformed into a range expression it is no longer an | |
11699 | -- attribute node and therefore the call needs to be avoided | |
11700 | -- and is accomplished by simply returning from the procedure. | |
996ae0b0 | 11701 | |
d8f43ee6 HK |
11702 | return; |
11703 | end Range_Attribute; | |
996ae0b0 | 11704 | |
3c08de34 ES |
11705 | ------------- |
11706 | -- Reduce -- | |
11707 | ------------- | |
11708 | ||
11709 | when Attribute_Reduce => | |
11710 | declare | |
11711 | E1 : constant Node_Id := First (Expressions (N)); | |
11712 | E2 : constant Node_Id := Next (E1); | |
11713 | Op : Entity_Id := Empty; | |
11714 | ||
11715 | Index : Interp_Index; | |
11716 | It : Interp; | |
11717 | function Proper_Op (Op : Entity_Id) return Boolean; | |
11718 | ||
11719 | --------------- | |
11720 | -- Proper_Op -- | |
11721 | --------------- | |
11722 | ||
11723 | function Proper_Op (Op : Entity_Id) return Boolean is | |
11724 | F1, F2 : Entity_Id; | |
11725 | ||
11726 | begin | |
11727 | F1 := First_Formal (Op); | |
11728 | if No (F1) then | |
11729 | return False; | |
11730 | else | |
11731 | F2 := Next_Formal (F1); | |
11732 | if No (F2) | |
11733 | or else Present (Next_Formal (F2)) | |
11734 | then | |
11735 | return False; | |
11736 | else | |
11737 | return | |
11738 | (Ekind (Op) = E_Operator | |
11739 | and then Scope (Op) = Standard_Standard) | |
11740 | or else Covers (Typ, Etype (Op)); | |
11741 | end if; | |
11742 | end if; | |
11743 | end Proper_Op; | |
11744 | ||
11745 | begin | |
11746 | Resolve (E2, Typ); | |
11747 | if Is_Overloaded (E1) then | |
11748 | Get_First_Interp (E1, Index, It); | |
11749 | while Present (It.Nam) loop | |
11750 | if Proper_Op (It.Nam) then | |
11751 | Op := It.Nam; | |
11752 | Set_Entity (E1, Op); | |
11753 | exit; | |
11754 | end if; | |
11755 | ||
11756 | Get_Next_Interp (Index, It); | |
11757 | end loop; | |
11758 | ||
11759 | elsif Proper_Op (Entity (E1)) then | |
11760 | Op := Entity (E1); | |
11761 | Set_Etype (N, Typ); | |
11762 | end if; | |
11763 | ||
11764 | if No (Op) then | |
11765 | Error_Msg_N ("No visible function for reduction", E1); | |
11766 | end if; | |
11767 | end; | |
11768 | ||
21d27997 RD |
11769 | ------------ |
11770 | -- Result -- | |
11771 | ------------ | |
11772 | ||
11773 | -- We will only come here during the prescan of a spec expression | |
11774 | -- containing a Result attribute. In that case the proper Etype has | |
11775 | -- already been set, and nothing more needs to be done here. | |
11776 | ||
11777 | when Attribute_Result => | |
11778 | null; | |
11779 | ||
996ae0b0 RK |
11780 | ---------------------- |
11781 | -- Unchecked_Access -- | |
11782 | ---------------------- | |
11783 | ||
11784 | -- Processing is shared with Access | |
11785 | ||
11786 | ------------------------- | |
11787 | -- Unrestricted_Access -- | |
11788 | ------------------------- | |
11789 | ||
11790 | -- Processing is shared with Access | |
11791 | ||
08cd7c2f AC |
11792 | ------------ |
11793 | -- Update -- | |
11794 | ------------ | |
11795 | ||
11796 | -- Resolve aggregate components in component associations | |
11797 | ||
d8f43ee6 HK |
11798 | when Attribute_Update => Update : declare |
11799 | Aggr : constant Node_Id := First (Expressions (N)); | |
11800 | Typ : constant Entity_Id := Etype (Prefix (N)); | |
11801 | Assoc : Node_Id; | |
11802 | Comp : Node_Id; | |
11803 | Expr : Node_Id; | |
08cd7c2f | 11804 | |
d8f43ee6 HK |
11805 | begin |
11806 | -- Set the Etype of the aggregate to that of the prefix, even | |
11807 | -- though the aggregate may not be a proper representation of a | |
11808 | -- value of the type (missing or duplicated associations, etc.) | |
11809 | -- Complete resolution of the prefix. Note that in Ada 2012 it | |
11810 | -- can be a qualified expression that is e.g. an aggregate. | |
11811 | ||
11812 | Set_Etype (Aggr, Typ); | |
11813 | Resolve (Prefix (N), Typ); | |
11814 | ||
11815 | -- For an array type, resolve expressions with the component type | |
11816 | -- of the array, and apply constraint checks when needed. | |
11817 | ||
11818 | if Is_Array_Type (Typ) then | |
11819 | Assoc := First (Component_Associations (Aggr)); | |
11820 | while Present (Assoc) loop | |
11821 | Expr := Expression (Assoc); | |
11822 | Resolve (Expr, Component_Type (Typ)); | |
11823 | ||
11824 | -- For scalar array components set Do_Range_Check when | |
11825 | -- needed. Constraint checking on non-scalar components | |
11826 | -- is done in Aggregate_Constraint_Checks, but only if | |
11827 | -- full analysis is enabled. These flags are not set in | |
11828 | -- the front-end in GnatProve mode. | |
11829 | ||
11830 | if Is_Scalar_Type (Component_Type (Typ)) | |
11831 | and then not Is_OK_Static_Expression (Expr) | |
f32eb591 | 11832 | and then not Range_Checks_Suppressed (Component_Type (Typ)) |
d8f43ee6 HK |
11833 | then |
11834 | if Is_Entity_Name (Expr) | |
11835 | and then Etype (Expr) = Component_Type (Typ) | |
414c6563 | 11836 | then |
d8f43ee6 | 11837 | null; |
414c6563 | 11838 | |
d8f43ee6 HK |
11839 | else |
11840 | Set_Do_Range_Check (Expr); | |
414c6563 | 11841 | end if; |
d8f43ee6 | 11842 | end if; |
3f1bc2cf | 11843 | |
d8f43ee6 HK |
11844 | -- The choices in the association are static constants, |
11845 | -- or static aggregates each of whose components belongs | |
11846 | -- to the proper index type. However, they must also | |
11847 | -- belong to the index subtype (s) of the prefix, which | |
11848 | -- may be a subtype (e.g. given by a slice). | |
3f1bc2cf | 11849 | |
d8f43ee6 HK |
11850 | -- Choices may also be identifiers with no staticness |
11851 | -- requirements, in which case they must resolve to the | |
11852 | -- index type. | |
3f1bc2cf | 11853 | |
d8f43ee6 HK |
11854 | declare |
11855 | C : Node_Id; | |
11856 | C_E : Node_Id; | |
11857 | Indx : Node_Id; | |
3f1bc2cf | 11858 | |
d8f43ee6 HK |
11859 | begin |
11860 | C := First (Choices (Assoc)); | |
11861 | while Present (C) loop | |
11862 | Indx := First_Index (Etype (Prefix (N))); | |
3f1bc2cf | 11863 | |
d8f43ee6 HK |
11864 | if Nkind (C) /= N_Aggregate then |
11865 | Analyze_And_Resolve (C, Etype (Indx)); | |
11866 | Apply_Constraint_Check (C, Etype (Indx)); | |
11867 | Check_Non_Static_Context (C); | |
3f1bc2cf | 11868 | |
d8f43ee6 HK |
11869 | else |
11870 | C_E := First (Expressions (C)); | |
11871 | while Present (C_E) loop | |
11872 | Analyze_And_Resolve (C_E, Etype (Indx)); | |
11873 | Apply_Constraint_Check (C_E, Etype (Indx)); | |
11874 | Check_Non_Static_Context (C_E); | |
11875 | ||
11876 | Next (C_E); | |
11877 | Next_Index (Indx); | |
11878 | end loop; | |
11879 | end if; | |
3f1bc2cf | 11880 | |
d8f43ee6 HK |
11881 | Next (C); |
11882 | end loop; | |
11883 | end; | |
3f1bc2cf | 11884 | |
d8f43ee6 HK |
11885 | Next (Assoc); |
11886 | end loop; | |
08cd7c2f | 11887 | |
d8f43ee6 HK |
11888 | -- For a record type, use type of each component, which is |
11889 | -- recorded during analysis. | |
08cd7c2f | 11890 | |
d8f43ee6 HK |
11891 | else |
11892 | Assoc := First (Component_Associations (Aggr)); | |
11893 | while Present (Assoc) loop | |
11894 | Comp := First (Choices (Assoc)); | |
11895 | Expr := Expression (Assoc); | |
3f1bc2cf | 11896 | |
d8f43ee6 HK |
11897 | if Nkind (Comp) /= N_Others_Choice |
11898 | and then not Error_Posted (Comp) | |
11899 | then | |
11900 | Resolve (Expr, Etype (Entity (Comp))); | |
33b87152 | 11901 | |
d8f43ee6 HK |
11902 | if Is_Scalar_Type (Etype (Entity (Comp))) |
11903 | and then not Is_OK_Static_Expression (Expr) | |
f32eb591 AC |
11904 | and then not Range_Checks_Suppressed |
11905 | (Etype (Entity (Comp))) | |
d8f43ee6 HK |
11906 | then |
11907 | Set_Do_Range_Check (Expr); | |
08cd7c2f | 11908 | end if; |
d8f43ee6 | 11909 | end if; |
3f1bc2cf | 11910 | |
d8f43ee6 HK |
11911 | Next (Assoc); |
11912 | end loop; | |
11913 | end if; | |
11914 | end Update; | |
08cd7c2f | 11915 | |
996ae0b0 RK |
11916 | --------- |
11917 | -- Val -- | |
11918 | --------- | |
11919 | ||
11920 | -- Apply range check. Note that we did not do this during the | |
11921 | -- analysis phase, since we wanted Eval_Attribute to have a | |
11922 | -- chance at finding an illegal out of range value. | |
11923 | ||
11924 | when Attribute_Val => | |
11925 | ||
11926 | -- Note that we do our own Eval_Attribute call here rather than | |
11927 | -- use the common one, because we need to do processing after | |
11928 | -- the call, as per above comment. | |
11929 | ||
11930 | Eval_Attribute (N); | |
11931 | ||
11932 | -- Eval_Attribute may replace the node with a raise CE, or | |
11933 | -- fold it to a constant. Obviously we only apply a scalar | |
a90bd866 | 11934 | -- range check if this did not happen. |
996ae0b0 RK |
11935 | |
11936 | if Nkind (N) = N_Attribute_Reference | |
11937 | and then Attribute_Name (N) = Name_Val | |
11938 | then | |
11939 | Apply_Scalar_Range_Check (First (Expressions (N)), Btyp); | |
11940 | end if; | |
11941 | ||
11942 | return; | |
11943 | ||
11944 | ------------- | |
11945 | -- Version -- | |
11946 | ------------- | |
11947 | ||
11948 | -- Prefix of Version attribute can be a subprogram name which | |
11949 | -- must not be resolved, since this is not a call. | |
11950 | ||
11951 | when Attribute_Version => | |
11952 | null; | |
11953 | ||
11954 | ---------------------- | |
11955 | -- Other Attributes -- | |
11956 | ---------------------- | |
11957 | ||
11958 | -- For other attributes, resolve prefix unless it is a type. If | |
11959 | -- the attribute reference itself is a type name ('Base and 'Class) | |
11960 | -- then this is only legal within a task or protected record. | |
11961 | ||
11962 | when others => | |
59fad002 | 11963 | if not Is_Entity_Name (P) or else not Is_Type (Entity (P)) then |
fbf5a39b | 11964 | Resolve (P); |
996ae0b0 RK |
11965 | end if; |
11966 | ||
11967 | -- If the attribute reference itself is a type name ('Base, | |
11968 | -- 'Class) then this is only legal within a task or protected | |
11969 | -- record. What is this all about ??? | |
11970 | ||
59fad002 | 11971 | if Is_Entity_Name (N) and then Is_Type (Entity (N)) then |
996ae0b0 RK |
11972 | if Is_Concurrent_Type (Entity (N)) |
11973 | and then In_Open_Scopes (Entity (P)) | |
11974 | then | |
11975 | null; | |
11976 | else | |
11977 | Error_Msg_N | |
11978 | ("invalid use of subtype name in expression or call", N); | |
11979 | end if; | |
11980 | end if; | |
11981 | ||
11982 | -- For attributes whose argument may be a string, complete | |
11983 | -- resolution of argument now. This avoids premature expansion | |
11984 | -- (and the creation of transient scopes) before the attribute | |
11985 | -- reference is resolved. | |
11986 | ||
11987 | case Attr_Id is | |
11988 | when Attribute_Value => | |
11989 | Resolve (First (Expressions (N)), Standard_String); | |
11990 | ||
11991 | when Attribute_Wide_Value => | |
11992 | Resolve (First (Expressions (N)), Standard_Wide_String); | |
11993 | ||
82c80734 RD |
11994 | when Attribute_Wide_Wide_Value => |
11995 | Resolve (First (Expressions (N)), Standard_Wide_Wide_String); | |
11996 | ||
996ae0b0 RK |
11997 | when others => null; |
11998 | end case; | |
fea9e956 ES |
11999 | |
12000 | -- If the prefix of the attribute is a class-wide type then it | |
12001 | -- will be expanded into a dispatching call to a predefined | |
12002 | -- primitive. Therefore we must check for potential violation | |
12003 | -- of such restriction. | |
12004 | ||
12005 | if Is_Class_Wide_Type (Etype (P)) then | |
12006 | Check_Restriction (No_Dispatching_Calls, N); | |
12007 | end if; | |
996ae0b0 RK |
12008 | end case; |
12009 | ||
851e9f19 PMR |
12010 | -- Mark use clauses of the original prefix if the attribute is applied |
12011 | -- to an entity. | |
12012 | ||
12013 | if Nkind (Original_Node (P)) in N_Has_Entity | |
12014 | and then Present (Entity (Original_Node (P))) | |
12015 | then | |
12016 | Mark_Use_Clauses (Original_Node (P)); | |
12017 | end if; | |
12018 | ||
996ae0b0 | 12019 | -- Normally the Freezing is done by Resolve but sometimes the Prefix |
442ade9d | 12020 | -- is not resolved, in which case the freezing must be done now. |
996ae0b0 | 12021 | |
13fa2acb AC |
12022 | -- For an elaboration check on a subprogram, we do not freeze its type. |
12023 | -- It may be declared in an unrelated scope, in particular in the case | |
12024 | -- of a generic function whose type may remain unelaborated. | |
12025 | ||
12026 | if Attr_Id = Attribute_Elaborated then | |
12027 | null; | |
12028 | ||
8b55e70d ES |
12029 | -- Should this be restricted to Expander_Active??? |
12030 | ||
13fa2acb AC |
12031 | else |
12032 | Freeze_Expression (P); | |
12033 | end if; | |
996ae0b0 RK |
12034 | |
12035 | -- Finally perform static evaluation on the attribute reference | |
12036 | ||
dec6faf1 | 12037 | Analyze_Dimension (N); |
996ae0b0 | 12038 | Eval_Attribute (N); |
996ae0b0 RK |
12039 | end Resolve_Attribute; |
12040 | ||
f7ea2603 RD |
12041 | ------------------------ |
12042 | -- Set_Boolean_Result -- | |
12043 | ------------------------ | |
12044 | ||
12045 | procedure Set_Boolean_Result (N : Node_Id; B : Boolean) is | |
12046 | Loc : constant Source_Ptr := Sloc (N); | |
f7ea2603 RD |
12047 | begin |
12048 | if B then | |
12049 | Rewrite (N, New_Occurrence_Of (Standard_True, Loc)); | |
12050 | else | |
12051 | Rewrite (N, New_Occurrence_Of (Standard_False, Loc)); | |
12052 | end if; | |
f7ea2603 RD |
12053 | end Set_Boolean_Result; |
12054 | ||
2df23f66 AC |
12055 | ------------------------------- |
12056 | -- Statically_Denotes_Object -- | |
12057 | ------------------------------- | |
12058 | ||
12059 | function Statically_Denotes_Object (N : Node_Id) return Boolean is | |
12060 | Indx : Node_Id; | |
12061 | ||
12062 | begin | |
12063 | if Is_Entity_Name (N) then | |
12064 | return True; | |
12065 | ||
12066 | elsif Nkind (N) = N_Selected_Component | |
12067 | and then Statically_Denotes_Object (Prefix (N)) | |
12068 | and then Present (Entity (Selector_Name (N))) | |
12069 | then | |
12070 | declare | |
12071 | Sel_Id : constant Entity_Id := Entity (Selector_Name (N)); | |
12072 | Comp_Decl : constant Node_Id := Parent (Sel_Id); | |
12073 | ||
12074 | begin | |
12075 | if Depends_On_Discriminant (Sel_Id) then | |
12076 | return False; | |
12077 | ||
12078 | elsif Nkind (Parent (Parent (Comp_Decl))) = N_Variant then | |
12079 | return False; | |
12080 | ||
12081 | else | |
12082 | return True; | |
12083 | end if; | |
12084 | end; | |
12085 | ||
12086 | elsif Nkind (N) = N_Indexed_Component | |
12087 | and then Statically_Denotes_Object (Prefix (N)) | |
12088 | and then Is_Constrained (Etype (Prefix (N))) | |
12089 | then | |
12090 | Indx := First (Expressions (N)); | |
12091 | while Present (Indx) loop | |
12092 | if not Compile_Time_Known_Value (Indx) | |
12093 | or else Do_Range_Check (Indx) | |
12094 | then | |
12095 | return False; | |
12096 | end if; | |
12097 | ||
12098 | Next (Indx); | |
12099 | end loop; | |
12100 | ||
12101 | return True; | |
12102 | ||
12103 | else | |
12104 | return False; | |
12105 | end if; | |
12106 | end Statically_Denotes_Object; | |
12107 | ||
edd63e9b ES |
12108 | -------------------------------- |
12109 | -- Stream_Attribute_Available -- | |
12110 | -------------------------------- | |
12111 | ||
12112 | function Stream_Attribute_Available | |
12113 | (Typ : Entity_Id; | |
12114 | Nam : TSS_Name_Type; | |
12115 | Partial_View : Node_Id := Empty) return Boolean | |
12116 | is | |
12117 | Etyp : Entity_Id := Typ; | |
12118 | ||
edd63e9b ES |
12119 | -- Start of processing for Stream_Attribute_Available |
12120 | ||
12121 | begin | |
12122 | -- We need some comments in this body ??? | |
12123 | ||
468c6c8a | 12124 | if Has_Stream_Attribute_Definition (Typ, Nam) then |
edd63e9b ES |
12125 | return True; |
12126 | end if; | |
12127 | ||
12128 | if Is_Class_Wide_Type (Typ) then | |
12129 | return not Is_Limited_Type (Typ) | |
12130 | or else Stream_Attribute_Available (Etype (Typ), Nam); | |
12131 | end if; | |
12132 | ||
12133 | if Nam = TSS_Stream_Input | |
fea9e956 | 12134 | and then Is_Abstract_Type (Typ) |
edd63e9b ES |
12135 | and then not Is_Class_Wide_Type (Typ) |
12136 | then | |
12137 | return False; | |
12138 | end if; | |
12139 | ||
12140 | if not (Is_Limited_Type (Typ) | |
12141 | or else (Present (Partial_View) | |
12142 | and then Is_Limited_Type (Partial_View))) | |
12143 | then | |
12144 | return True; | |
12145 | end if; | |
12146 | ||
65f01153 RD |
12147 | -- In Ada 2005, Input can invoke Read, and Output can invoke Write |
12148 | ||
12149 | if Nam = TSS_Stream_Input | |
0791fbe9 | 12150 | and then Ada_Version >= Ada_2005 |
65f01153 RD |
12151 | and then Stream_Attribute_Available (Etyp, TSS_Stream_Read) |
12152 | then | |
12153 | return True; | |
12154 | ||
12155 | elsif Nam = TSS_Stream_Output | |
0791fbe9 | 12156 | and then Ada_Version >= Ada_2005 |
65f01153 RD |
12157 | and then Stream_Attribute_Available (Etyp, TSS_Stream_Write) |
12158 | then | |
12159 | return True; | |
edd63e9b ES |
12160 | end if; |
12161 | ||
12162 | -- Case of Read and Write: check for attribute definition clause that | |
12163 | -- applies to an ancestor type. | |
12164 | ||
12165 | while Etype (Etyp) /= Etyp loop | |
12166 | Etyp := Etype (Etyp); | |
12167 | ||
468c6c8a | 12168 | if Has_Stream_Attribute_Definition (Etyp, Nam) then |
edd63e9b ES |
12169 | return True; |
12170 | end if; | |
12171 | end loop; | |
12172 | ||
0791fbe9 | 12173 | if Ada_Version < Ada_2005 then |
edd63e9b ES |
12174 | |
12175 | -- In Ada 95 mode, also consider a non-visible definition | |
12176 | ||
12177 | declare | |
12178 | Btyp : constant Entity_Id := Implementation_Base_Type (Typ); | |
12179 | begin | |
12180 | return Btyp /= Typ | |
12181 | and then Stream_Attribute_Available | |
12182 | (Btyp, Nam, Partial_View => Typ); | |
12183 | end; | |
12184 | end if; | |
12185 | ||
12186 | return False; | |
12187 | end Stream_Attribute_Available; | |
12188 | ||
996ae0b0 | 12189 | end Sem_Attr; |