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70482933 RK |
1 | ------------------------------------------------------------------------------ |
2 | -- -- | |
3 | -- GNAT COMPILER COMPONENTS -- | |
4 | -- -- | |
5 | -- E X P _ A T T R -- | |
6 | -- -- | |
7 | -- B o d y -- | |
8 | -- -- | |
bc0b26b9 | 9 | -- Copyright (C) 1992-2022, Free Software Foundation, Inc. -- |
70482933 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- -- | |
748086b7 | 13 | -- ware Foundation; either version 3, or (at your option) any later ver- -- |
70482933 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 -- | |
9eea4346 GB |
16 | -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License -- |
17 | -- for more details. You should have received a copy of the GNU General -- | |
18 | -- Public License distributed with GNAT; see file COPYING3. If not, go to -- | |
19 | -- http://www.gnu.org/licenses for a complete copy of the license. -- | |
70482933 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. -- |
70482933 RK |
23 | -- -- |
24 | ------------------------------------------------------------------------------ | |
25 | ||
104f58db BD |
26 | with Aspects; use Aspects; |
27 | with Atree; use Atree; | |
28 | with Checks; use Checks; | |
29 | with Einfo; use Einfo; | |
76f9c7f4 | 30 | with Einfo.Entities; use Einfo.Entities; |
104f58db BD |
31 | with Einfo.Utils; use Einfo.Utils; |
32 | with Elists; use Elists; | |
33 | with Exp_Atag; use Exp_Atag; | |
34 | with Exp_Ch3; use Exp_Ch3; | |
35 | with Exp_Ch6; use Exp_Ch6; | |
36 | with Exp_Ch9; use Exp_Ch9; | |
37 | with Exp_Dist; use Exp_Dist; | |
38 | with Exp_Imgv; use Exp_Imgv; | |
39 | with Exp_Pakd; use Exp_Pakd; | |
40 | with Exp_Strm; use Exp_Strm; | |
110d0820 | 41 | with Exp_Put_Image; |
104f58db BD |
42 | with Exp_Tss; use Exp_Tss; |
43 | with Exp_Util; use Exp_Util; | |
44 | with Expander; use Expander; | |
45 | with Freeze; use Freeze; | |
46 | with Gnatvsn; use Gnatvsn; | |
47 | with Itypes; use Itypes; | |
48 | with Lib; use Lib; | |
49 | with Namet; use Namet; | |
50 | with Nmake; use Nmake; | |
51 | with Nlists; use Nlists; | |
52 | with Opt; use Opt; | |
53 | with Restrict; use Restrict; | |
54 | with Rident; use Rident; | |
55 | with Rtsfind; use Rtsfind; | |
56 | with Sem; use Sem; | |
57 | with Sem_Aux; use Sem_Aux; | |
58 | with Sem_Ch6; use Sem_Ch6; | |
59 | with Sem_Ch7; use Sem_Ch7; | |
60 | with Sem_Ch8; use Sem_Ch8; | |
61 | with Sem_Eval; use Sem_Eval; | |
62 | with Sem_Res; use Sem_Res; | |
63 | with Sem_Util; use Sem_Util; | |
64 | with Sinfo; use Sinfo; | |
65 | with Sinfo.Nodes; use Sinfo.Nodes; | |
66 | with Sinfo.Utils; use Sinfo.Utils; | |
67 | with Snames; use Snames; | |
68 | with Stand; use Stand; | |
69 | with Stringt; use Stringt; | |
d235950e | 70 | with Strub; use Strub; |
104f58db BD |
71 | with Tbuild; use Tbuild; |
72 | with Ttypes; use Ttypes; | |
73 | with Uintp; use Uintp; | |
74 | with Uname; use Uname; | |
75 | with Urealp; use Urealp; | |
76 | with Validsw; use Validsw; | |
70482933 RK |
77 | |
78 | package body Exp_Attr is | |
79 | ||
80 | ----------------------- | |
81 | -- Local Subprograms -- | |
82 | ----------------------- | |
83 | ||
99fc068e | 84 | function Build_Array_VS_Func |
f16cb8df HK |
85 | (Attr : Node_Id; |
86 | Formal_Typ : Entity_Id; | |
a4dafb8b | 87 | Array_Typ : Entity_Id) return Entity_Id; |
f16cb8df HK |
88 | -- Validate the components of an array type by means of a function. Return |
89 | -- the entity of the validation function. The parameters are as follows: | |
90 | -- | |
91 | -- * Attr - the 'Valid_Scalars attribute for which the function is | |
92 | -- generated. | |
93 | -- | |
94 | -- * Formal_Typ - the type of the generated function's only formal | |
95 | -- parameter. | |
96 | -- | |
97 | -- * Array_Typ - the array type whose components are to be validated | |
99fc068e | 98 | |
99bba92c AC |
99 | function Build_Disp_Get_Task_Id_Call (Actual : Node_Id) return Node_Id; |
100 | -- Build a call to Disp_Get_Task_Id, passing Actual as actual parameter | |
101 | ||
45ec05e1 | 102 | function Build_Record_VS_Func |
f16cb8df HK |
103 | (Attr : Node_Id; |
104 | Formal_Typ : Entity_Id; | |
105 | Rec_Typ : Entity_Id) return Entity_Id; | |
106 | -- Validate the components, discriminants, and variants of a record type by | |
107 | -- means of a function. Return the entity of the validation function. The | |
108 | -- parameters are as follows: | |
109 | -- | |
110 | -- * Attr - the 'Valid_Scalars attribute for which the function is | |
111 | -- generated. | |
112 | -- | |
113 | -- * Formal_Typ - the type of the generated function's only formal | |
114 | -- parameter. | |
115 | -- | |
116 | -- * Rec_Typ - the record type whose internals are to be validated | |
45ec05e1 | 117 | |
70482933 RK |
118 | procedure Compile_Stream_Body_In_Scope |
119 | (N : Node_Id; | |
120 | Decl : Node_Id; | |
fb632ef5 | 121 | Arr : Entity_Id); |
70482933 RK |
122 | -- The body for a stream subprogram may be generated outside of the scope |
123 | -- of the type. If the type is fully private, it may depend on the full | |
3b42c566 | 124 | -- view of other types (e.g. indexes) that are currently private as well. |
70482933 RK |
125 | -- We install the declarations of the package in which the type is declared |
126 | -- before compiling the body in what is its proper environment. The Check | |
127 | -- parameter indicates if checks are to be suppressed for the stream body. | |
128 | -- We suppress checks for array/record reads, since the rule is that these | |
129 | -- are like assignments, out of range values due to uninitialized storage, | |
130 | -- or other invalid values do NOT cause a Constraint_Error to be raised. | |
3dddb11e ES |
131 | -- If we are within an instance body all visibility has been established |
132 | -- already and there is no need to install the package. | |
70482933 | 133 | |
73f05f9f ES |
134 | -- This mechanism is now extended to the component types of the array type, |
135 | -- when the component type is not in scope and is private, to handle | |
136 | -- properly the case when the full view has defaulted discriminants. | |
137 | ||
138 | -- This special processing is ultimately caused by the fact that the | |
139 | -- compiler lacks a well-defined phase when full views are visible | |
140 | -- everywhere. Having such a separate pass would remove much of the | |
141 | -- special-case code that shuffles partial and full views in the middle | |
142 | -- of semantic analysis and expansion. | |
143 | ||
29f2d76c SB |
144 | function Default_Streaming_Unavailable (Typ : Entity_Id) return Boolean; |
145 | -- | |
146 | -- In most cases, references to unavailable streaming attributes | |
147 | -- are rejected at compile time. In some obscure cases involving | |
148 | -- generics and formal derived types, the problem is dealt with at runtime. | |
149 | ||
7ce611e2 ES |
150 | procedure Expand_Access_To_Protected_Op |
151 | (N : Node_Id; | |
152 | Pref : Node_Id; | |
153 | Typ : Entity_Id); | |
7ce611e2 ES |
154 | -- An attribute reference to a protected subprogram is transformed into |
155 | -- a pair of pointers: one to the object, and one to the operations. | |
156 | -- This expansion is performed for 'Access and for 'Unrestricted_Access. | |
157 | ||
70482933 | 158 | procedure Expand_Fpt_Attribute |
fbf5a39b | 159 | (N : Node_Id; |
65f01153 | 160 | Pkg : RE_Id; |
fbf5a39b | 161 | Nam : Name_Id; |
70482933 RK |
162 | Args : List_Id); |
163 | -- This procedure expands a call to a floating-point attribute function. | |
164 | -- N is the attribute reference node, and Args is a list of arguments to | |
65f01153 RD |
165 | -- be passed to the function call. Pkg identifies the package containing |
166 | -- the appropriate instantiation of System.Fat_Gen. Float arguments in Args | |
167 | -- have already been converted to the floating-point type for which Pkg was | |
168 | -- instantiated. The Nam argument is the relevant attribute processing | |
c46dffc6 | 169 | -- routine to be called. This is the same as the attribute name. |
70482933 RK |
170 | |
171 | procedure Expand_Fpt_Attribute_R (N : Node_Id); | |
172 | -- This procedure expands a call to a floating-point attribute function | |
fbf5a39b AC |
173 | -- that takes a single floating-point argument. The function to be called |
174 | -- is always the same as the attribute name. | |
70482933 RK |
175 | |
176 | procedure Expand_Fpt_Attribute_RI (N : Node_Id); | |
177 | -- This procedure expands a call to a floating-point attribute function | |
fbf5a39b AC |
178 | -- that takes one floating-point argument and one integer argument. The |
179 | -- function to be called is always the same as the attribute name. | |
70482933 RK |
180 | |
181 | procedure Expand_Fpt_Attribute_RR (N : Node_Id); | |
182 | -- This procedure expands a call to a floating-point attribute function | |
fbf5a39b AC |
183 | -- that takes two floating-point arguments. The function to be called |
184 | -- is always the same as the attribute name. | |
70482933 | 185 | |
aa9b151a | 186 | procedure Expand_Loop_Entry_Attribute (N : Node_Id); |
d436b30d AC |
187 | -- Handle the expansion of attribute 'Loop_Entry. As a result, the related |
188 | -- loop may be converted into a conditional block. See body for details. | |
189 | ||
e0f63680 AC |
190 | procedure Expand_Min_Max_Attribute (N : Node_Id); |
191 | -- Handle the expansion of attributes 'Max and 'Min, including expanding | |
192 | -- then out if we are in Modify_Tree_For_C mode. | |
193 | ||
aa9b151a | 194 | procedure Expand_Pred_Succ_Attribute (N : Node_Id); |
70482933 RK |
195 | -- Handles expansion of Pred or Succ attributes for case of non-real |
196 | -- operand with overflow checking required. | |
197 | ||
18a2ad5d AC |
198 | procedure Expand_Update_Attribute (N : Node_Id); |
199 | -- Handle the expansion of attribute Update | |
200 | ||
65f01153 RD |
201 | procedure Find_Fat_Info |
202 | (T : Entity_Id; | |
203 | Fat_Type : out Entity_Id; | |
204 | Fat_Pkg : out RE_Id); | |
205 | -- Given a floating-point type T, identifies the package containing the | |
206 | -- attributes for this type (returned in Fat_Pkg), and the corresponding | |
207 | -- type for which this package was instantiated from Fat_Gen. Error if T | |
208 | -- is not a floating-point type. | |
209 | ||
fbf5a39b AC |
210 | function Find_Stream_Subprogram |
211 | (Typ : Entity_Id; | |
212 | Nam : TSS_Name_Type) return Entity_Id; | |
213 | -- Returns the stream-oriented subprogram attribute for Typ. For tagged | |
214 | -- types, the corresponding primitive operation is looked up, else the | |
215 | -- appropriate TSS from the type itself, or from its closest ancestor | |
216 | -- defining it, is returned. In both cases, inheritance of representation | |
217 | -- aspects is thus taken into account. | |
70482933 | 218 | |
96d2756f AC |
219 | function Full_Base (T : Entity_Id) return Entity_Id; |
220 | -- The stream functions need to examine the underlying representation of | |
221 | -- composite types. In some cases T may be non-private but its base type | |
222 | -- is, in which case the function returns the corresponding full view. | |
223 | ||
1d571f3b AC |
224 | function Get_Stream_Convert_Pragma (T : Entity_Id) return Node_Id; |
225 | -- Given a type, find a corresponding stream convert pragma that applies to | |
226 | -- the implementation base type of this type (Typ). If found, return the | |
227 | -- pragma node, otherwise return Empty if no pragma is found. | |
228 | ||
70482933 RK |
229 | function Is_Constrained_Packed_Array (Typ : Entity_Id) return Boolean; |
230 | -- Utility for array attributes, returns true on packed constrained | |
231 | -- arrays, and on access to same. | |
232 | ||
0669bebe GB |
233 | function Is_Inline_Floating_Point_Attribute (N : Node_Id) return Boolean; |
234 | -- Returns true iff the given node refers to an attribute call that | |
235 | -- can be expanded directly by the back end and does not need front end | |
236 | -- expansion. Typically used for rounding and truncation attributes that | |
237 | -- appear directly inside a conversion to integer. | |
238 | ||
99fc068e RD |
239 | ------------------------- |
240 | -- Build_Array_VS_Func -- | |
241 | ------------------------- | |
242 | ||
243 | function Build_Array_VS_Func | |
f16cb8df HK |
244 | (Attr : Node_Id; |
245 | Formal_Typ : Entity_Id; | |
a4dafb8b | 246 | Array_Typ : Entity_Id) return Entity_Id |
99fc068e | 247 | is |
a4dafb8b PT |
248 | Loc : constant Source_Ptr := Sloc (Attr); |
249 | Comp_Typ : constant Entity_Id := | |
7aaf6620 | 250 | Validated_View (Component_Type (Array_Typ)); |
f16cb8df HK |
251 | |
252 | function Validate_Component | |
253 | (Obj_Id : Entity_Id; | |
254 | Indexes : List_Id) return Node_Id; | |
255 | -- Process a single component denoted by indexes Indexes. Obj_Id denotes | |
256 | -- the entity of the validation parameter. Return the check associated | |
257 | -- with the component. | |
258 | ||
259 | function Validate_Dimension | |
260 | (Obj_Id : Entity_Id; | |
261 | Dim : Int; | |
262 | Indexes : List_Id) return Node_Id; | |
263 | -- Process dimension Dim of the array type. Obj_Id denotes the entity | |
264 | -- of the validation parameter. Indexes is a list where each dimension | |
265 | -- deposits its loop variable, which will later identify a component. | |
266 | -- Return the loop associated with the current dimension. | |
99fc068e | 267 | |
f16cb8df HK |
268 | ------------------------ |
269 | -- Validate_Component -- | |
270 | ------------------------ | |
99fc068e | 271 | |
f16cb8df HK |
272 | function Validate_Component |
273 | (Obj_Id : Entity_Id; | |
274 | Indexes : List_Id) return Node_Id | |
275 | is | |
276 | Attr_Nam : Name_Id; | |
99fc068e RD |
277 | |
278 | begin | |
f16cb8df HK |
279 | if Is_Scalar_Type (Comp_Typ) then |
280 | Attr_Nam := Name_Valid; | |
99fc068e | 281 | else |
f16cb8df | 282 | Attr_Nam := Name_Valid_Scalars; |
99fc068e RD |
283 | end if; |
284 | ||
f16cb8df HK |
285 | -- Generate: |
286 | -- if not Array_Typ (Obj_Id) (Indexes)'Valid[_Scalars] then | |
287 | -- return False; | |
288 | -- end if; | |
289 | ||
290 | return | |
99fc068e RD |
291 | Make_If_Statement (Loc, |
292 | Condition => | |
293 | Make_Op_Not (Loc, | |
294 | Right_Opnd => | |
295 | Make_Attribute_Reference (Loc, | |
f16cb8df HK |
296 | Prefix => |
297 | Make_Indexed_Component (Loc, | |
298 | Prefix => | |
299 | Unchecked_Convert_To (Array_Typ, | |
300 | New_Occurrence_Of (Obj_Id, Loc)), | |
301 | Expressions => Indexes), | |
302 | Attribute_Name => Attr_Nam)), | |
303 | ||
99fc068e RD |
304 | Then_Statements => New_List ( |
305 | Make_Simple_Return_Statement (Loc, | |
f16cb8df HK |
306 | Expression => New_Occurrence_Of (Standard_False, Loc)))); |
307 | end Validate_Component; | |
99fc068e RD |
308 | |
309 | ------------------------ | |
f16cb8df | 310 | -- Validate_Dimension -- |
99fc068e RD |
311 | ------------------------ |
312 | ||
f16cb8df HK |
313 | function Validate_Dimension |
314 | (Obj_Id : Entity_Id; | |
315 | Dim : Int; | |
316 | Indexes : List_Id) return Node_Id | |
317 | is | |
99fc068e RD |
318 | Index : Entity_Id; |
319 | ||
320 | begin | |
f16cb8df HK |
321 | -- Validate the component once all dimensions have produced their |
322 | -- individual loops. | |
99fc068e | 323 | |
f16cb8df HK |
324 | if Dim > Number_Dimensions (Array_Typ) then |
325 | return Validate_Component (Obj_Id, Indexes); | |
99fc068e | 326 | |
f16cb8df | 327 | -- Process the current dimension |
99fc068e RD |
328 | |
329 | else | |
330 | Index := | |
f16cb8df | 331 | Make_Defining_Identifier (Loc, New_External_Name ('J', Dim)); |
99fc068e | 332 | |
f16cb8df | 333 | Append_To (Indexes, New_Occurrence_Of (Index, Loc)); |
99fc068e | 334 | |
f16cb8df HK |
335 | -- Generate: |
336 | -- for J1 in Array_Typ (Obj_Id)'Range (1) loop | |
337 | -- for JN in Array_Typ (Obj_Id)'Range (N) loop | |
338 | -- if not Array_Typ (Obj_Id) (Indexes)'Valid[_Scalars] | |
339 | -- then | |
340 | -- return False; | |
341 | -- end if; | |
342 | -- end loop; | |
343 | -- end loop; | |
344 | ||
345 | return | |
346 | Make_Implicit_Loop_Statement (Attr, | |
347 | Identifier => Empty, | |
99fc068e RD |
348 | Iteration_Scheme => |
349 | Make_Iteration_Scheme (Loc, | |
350 | Loop_Parameter_Specification => | |
351 | Make_Loop_Parameter_Specification (Loc, | |
f16cb8df | 352 | Defining_Identifier => Index, |
99fc068e RD |
353 | Discrete_Subtype_Definition => |
354 | Make_Attribute_Reference (Loc, | |
f16cb8df HK |
355 | Prefix => |
356 | Unchecked_Convert_To (Array_Typ, | |
357 | New_Occurrence_Of (Obj_Id, Loc)), | |
99fc068e RD |
358 | Attribute_Name => Name_Range, |
359 | Expressions => New_List ( | |
f16cb8df HK |
360 | Make_Integer_Literal (Loc, Dim))))), |
361 | Statements => New_List ( | |
362 | Validate_Dimension (Obj_Id, Dim + 1, Indexes))); | |
99fc068e | 363 | end if; |
f16cb8df HK |
364 | end Validate_Dimension; |
365 | ||
366 | -- Local variables | |
367 | ||
368 | Func_Id : constant Entity_Id := Make_Temporary (Loc, 'V'); | |
369 | Indexes : constant List_Id := New_List; | |
370 | Obj_Id : constant Entity_Id := Make_Temporary (Loc, 'A'); | |
371 | Stmts : List_Id; | |
99fc068e RD |
372 | |
373 | -- Start of processing for Build_Array_VS_Func | |
374 | ||
375 | begin | |
f16cb8df | 376 | Stmts := New_List (Validate_Dimension (Obj_Id, 1, Indexes)); |
99fc068e | 377 | |
f16cb8df HK |
378 | -- Generate: |
379 | -- return True; | |
99fc068e | 380 | |
f16cb8df HK |
381 | Append_To (Stmts, |
382 | Make_Simple_Return_Statement (Loc, | |
383 | Expression => New_Occurrence_Of (Standard_True, Loc))); | |
99fc068e | 384 | |
f16cb8df HK |
385 | -- Generate: |
386 | -- function Func_Id (Obj_Id : Formal_Typ) return Boolean is | |
387 | -- begin | |
388 | -- Stmts | |
389 | -- end Func_Id; | |
99fc068e | 390 | |
2e02ab86 | 391 | Mutate_Ekind (Func_Id, E_Function); |
99fc068e | 392 | Set_Is_Internal (Func_Id); |
f16cb8df HK |
393 | Set_Is_Pure (Func_Id); |
394 | ||
395 | if not Debug_Generated_Code then | |
396 | Set_Debug_Info_Off (Func_Id); | |
397 | end if; | |
99fc068e | 398 | |
f16cb8df | 399 | Insert_Action (Attr, |
99fc068e RD |
400 | Make_Subprogram_Body (Loc, |
401 | Specification => | |
402 | Make_Function_Specification (Loc, | |
403 | Defining_Unit_Name => Func_Id, | |
f16cb8df HK |
404 | Parameter_Specifications => New_List ( |
405 | Make_Parameter_Specification (Loc, | |
406 | Defining_Identifier => Obj_Id, | |
f16cb8df HK |
407 | Parameter_Type => New_Occurrence_Of (Formal_Typ, Loc))), |
408 | Result_Definition => | |
409 | New_Occurrence_Of (Standard_Boolean, Loc)), | |
99fc068e RD |
410 | Declarations => New_List, |
411 | Handled_Statement_Sequence => | |
412 | Make_Handled_Sequence_Of_Statements (Loc, | |
f16cb8df | 413 | Statements => Stmts))); |
99fc068e | 414 | |
99fc068e RD |
415 | return Func_Id; |
416 | end Build_Array_VS_Func; | |
417 | ||
99bba92c AC |
418 | --------------------------------- |
419 | -- Build_Disp_Get_Task_Id_Call -- | |
420 | --------------------------------- | |
421 | ||
422 | function Build_Disp_Get_Task_Id_Call (Actual : Node_Id) return Node_Id is | |
c0e938d0 AC |
423 | Loc : constant Source_Ptr := Sloc (Actual); |
424 | Typ : constant Entity_Id := Etype (Actual); | |
425 | Subp : constant Entity_Id := Find_Prim_Op (Typ, Name_uDisp_Get_Task_Id); | |
426 | ||
99bba92c | 427 | begin |
c0e938d0 AC |
428 | -- Generate: |
429 | -- _Disp_Get_Task_Id (Actual) | |
430 | ||
431 | return | |
432 | Make_Function_Call (Loc, | |
433 | Name => New_Occurrence_Of (Subp, Loc), | |
434 | Parameter_Associations => New_List (Actual)); | |
99bba92c AC |
435 | end Build_Disp_Get_Task_Id_Call; |
436 | ||
45ec05e1 RD |
437 | -------------------------- |
438 | -- Build_Record_VS_Func -- | |
439 | -------------------------- | |
440 | ||
45ec05e1 | 441 | function Build_Record_VS_Func |
f16cb8df HK |
442 | (Attr : Node_Id; |
443 | Formal_Typ : Entity_Id; | |
444 | Rec_Typ : Entity_Id) return Entity_Id | |
45ec05e1 | 445 | is |
f16cb8df HK |
446 | -- NOTE: The logic of Build_Record_VS_Func is intentionally passive. |
447 | -- It generates code only when there are components, discriminants, | |
448 | -- or variant parts to validate. | |
449 | ||
450 | -- NOTE: The routines within Build_Record_VS_Func are intentionally | |
451 | -- unnested to avoid deep indentation of code. | |
452 | ||
453 | Loc : constant Source_Ptr := Sloc (Attr); | |
454 | ||
455 | procedure Validate_Component_List | |
456 | (Obj_Id : Entity_Id; | |
457 | Comp_List : Node_Id; | |
458 | Stmts : in out List_Id); | |
459 | -- Process all components and variant parts of component list Comp_List. | |
460 | -- Obj_Id denotes the entity of the validation parameter. All new code | |
461 | -- is added to list Stmts. | |
462 | ||
463 | procedure Validate_Field | |
464 | (Obj_Id : Entity_Id; | |
465 | Field : Node_Id; | |
466 | Cond : in out Node_Id); | |
467 | -- Process component declaration or discriminant specification Field. | |
468 | -- Obj_Id denotes the entity of the validation parameter. Cond denotes | |
469 | -- an "or else" conditional expression which contains the new code (if | |
470 | -- any). | |
471 | ||
472 | procedure Validate_Fields | |
473 | (Obj_Id : Entity_Id; | |
474 | Fields : List_Id; | |
475 | Stmts : in out List_Id); | |
476 | -- Process component declarations or discriminant specifications in list | |
477 | -- Fields. Obj_Id denotes the entity of the validation parameter. All | |
478 | -- new code is added to list Stmts. | |
479 | ||
480 | procedure Validate_Variant | |
481 | (Obj_Id : Entity_Id; | |
482 | Var : Node_Id; | |
483 | Alts : in out List_Id); | |
484 | -- Process variant Var. Obj_Id denotes the entity of the validation | |
485 | -- parameter. Alts denotes a list of case statement alternatives which | |
486 | -- contains the new code (if any). | |
487 | ||
488 | procedure Validate_Variant_Part | |
489 | (Obj_Id : Entity_Id; | |
490 | Var_Part : Node_Id; | |
491 | Stmts : in out List_Id); | |
492 | -- Process variant part Var_Part. Obj_Id denotes the entity of the | |
493 | -- validation parameter. All new code is added to list Stmts. | |
45ec05e1 | 494 | |
f16cb8df HK |
495 | ----------------------------- |
496 | -- Validate_Component_List -- | |
497 | ----------------------------- | |
45ec05e1 | 498 | |
f16cb8df HK |
499 | procedure Validate_Component_List |
500 | (Obj_Id : Entity_Id; | |
501 | Comp_List : Node_Id; | |
502 | Stmts : in out List_Id) | |
503 | is | |
504 | Var_Part : constant Node_Id := Variant_Part (Comp_List); | |
45ec05e1 | 505 | |
f16cb8df HK |
506 | begin |
507 | -- Validate all components | |
508 | ||
509 | Validate_Fields | |
510 | (Obj_Id => Obj_Id, | |
511 | Fields => Component_Items (Comp_List), | |
512 | Stmts => Stmts); | |
513 | ||
514 | -- Validate the variant part | |
515 | ||
516 | if Present (Var_Part) then | |
517 | Validate_Variant_Part | |
518 | (Obj_Id => Obj_Id, | |
519 | Var_Part => Var_Part, | |
520 | Stmts => Stmts); | |
521 | end if; | |
522 | end Validate_Component_List; | |
45ec05e1 | 523 | |
f16cb8df HK |
524 | -------------------- |
525 | -- Validate_Field -- | |
526 | -------------------- | |
527 | ||
528 | procedure Validate_Field | |
529 | (Obj_Id : Entity_Id; | |
530 | Field : Node_Id; | |
531 | Cond : in out Node_Id) | |
45ec05e1 | 532 | is |
f16cb8df HK |
533 | Field_Id : constant Entity_Id := Defining_Entity (Field); |
534 | Field_Nam : constant Name_Id := Chars (Field_Id); | |
7aaf6620 | 535 | Field_Typ : constant Entity_Id := Validated_View (Etype (Field_Id)); |
f16cb8df | 536 | Attr_Nam : Name_Id; |
45ec05e1 RD |
537 | |
538 | begin | |
f16cb8df HK |
539 | -- Do not process internally-generated fields. Note that checking for |
540 | -- Comes_From_Source is not correct because this will eliminate the | |
541 | -- components within the corresponding record of a protected type. | |
45ec05e1 | 542 | |
4a08c95c | 543 | if Field_Nam in Name_uObject | Name_uParent | Name_uTag then |
f16cb8df | 544 | null; |
45ec05e1 | 545 | |
f16cb8df | 546 | -- Do not process fields without any scalar components |
45ec05e1 | 547 | |
f16cb8df HK |
548 | elsif not Scalar_Part_Present (Field_Typ) then |
549 | null; | |
550 | ||
551 | -- Otherwise the field needs to be validated. Use Make_Identifier | |
552 | -- rather than New_Occurrence_Of to identify the field because the | |
553 | -- wrong entity may be picked up when private types are involved. | |
554 | ||
555 | -- Generate: | |
556 | -- [or else] not Rec_Typ (Obj_Id).Item_Nam'Valid[_Scalars] | |
557 | ||
558 | else | |
559 | if Is_Scalar_Type (Field_Typ) then | |
560 | Attr_Nam := Name_Valid; | |
561 | else | |
562 | Attr_Nam := Name_Valid_Scalars; | |
563 | end if; | |
564 | ||
565 | Evolve_Or_Else (Cond, | |
566 | Make_Op_Not (Loc, | |
567 | Right_Opnd => | |
568 | Make_Attribute_Reference (Loc, | |
569 | Prefix => | |
570 | Make_Selected_Component (Loc, | |
571 | Prefix => | |
572 | Unchecked_Convert_To (Rec_Typ, | |
573 | New_Occurrence_Of (Obj_Id, Loc)), | |
574 | Selector_Name => Make_Identifier (Loc, Field_Nam)), | |
575 | Attribute_Name => Attr_Nam))); | |
45ec05e1 | 576 | end if; |
f16cb8df | 577 | end Validate_Field; |
45ec05e1 | 578 | |
f16cb8df HK |
579 | --------------------- |
580 | -- Validate_Fields -- | |
581 | --------------------- | |
45ec05e1 | 582 | |
f16cb8df HK |
583 | procedure Validate_Fields |
584 | (Obj_Id : Entity_Id; | |
585 | Fields : List_Id; | |
586 | Stmts : in out List_Id) | |
587 | is | |
588 | Cond : Node_Id; | |
589 | Field : Node_Id; | |
45ec05e1 | 590 | |
f16cb8df HK |
591 | begin |
592 | -- Assume that none of the fields are eligible for verification | |
45ec05e1 | 593 | |
f16cb8df | 594 | Cond := Empty; |
45ec05e1 | 595 | |
f16cb8df | 596 | -- Validate all fields |
45ec05e1 | 597 | |
f16cb8df HK |
598 | Field := First_Non_Pragma (Fields); |
599 | while Present (Field) loop | |
600 | Validate_Field | |
601 | (Obj_Id => Obj_Id, | |
602 | Field => Field, | |
603 | Cond => Cond); | |
45ec05e1 | 604 | |
f16cb8df HK |
605 | Next_Non_Pragma (Field); |
606 | end loop; | |
45ec05e1 | 607 | |
f16cb8df HK |
608 | -- Generate: |
609 | -- if not Rec_Typ (Obj_Id).Item_Nam_1'Valid[_Scalars] | |
610 | -- or else not Rec_Typ (Obj_Id).Item_Nam_N'Valid[_Scalars] | |
611 | -- then | |
612 | -- return False; | |
613 | -- end if; | |
45ec05e1 | 614 | |
f16cb8df HK |
615 | if Present (Cond) then |
616 | Append_New_To (Stmts, | |
617 | Make_Implicit_If_Statement (Attr, | |
618 | Condition => Cond, | |
619 | Then_Statements => New_List ( | |
620 | Make_Simple_Return_Statement (Loc, | |
621 | Expression => New_Occurrence_Of (Standard_False, Loc))))); | |
622 | end if; | |
623 | end Validate_Fields; | |
45ec05e1 | 624 | |
f16cb8df HK |
625 | ---------------------- |
626 | -- Validate_Variant -- | |
627 | ---------------------- | |
45ec05e1 | 628 | |
f16cb8df HK |
629 | procedure Validate_Variant |
630 | (Obj_Id : Entity_Id; | |
631 | Var : Node_Id; | |
632 | Alts : in out List_Id) | |
633 | is | |
634 | Stmts : List_Id; | |
45ec05e1 | 635 | |
f16cb8df HK |
636 | begin |
637 | -- Assume that none of the components and variants are eligible for | |
638 | -- verification. | |
45ec05e1 | 639 | |
f16cb8df | 640 | Stmts := No_List; |
45ec05e1 | 641 | |
b108c2ed | 642 | -- Validate components |
45ec05e1 | 643 | |
f16cb8df HK |
644 | Validate_Component_List |
645 | (Obj_Id => Obj_Id, | |
646 | Comp_List => Component_List (Var), | |
647 | Stmts => Stmts); | |
648 | ||
649 | -- Generate a null statement in case none of the components were | |
650 | -- verified because this will otherwise eliminate an alternative | |
651 | -- from the variant case statement and render the generated code | |
652 | -- illegal. | |
45ec05e1 | 653 | |
f16cb8df HK |
654 | if No (Stmts) then |
655 | Append_New_To (Stmts, Make_Null_Statement (Loc)); | |
656 | end if; | |
45ec05e1 | 657 | |
f16cb8df HK |
658 | -- Generate: |
659 | -- when Discrete_Choices => | |
660 | -- Stmts | |
661 | ||
662 | Append_New_To (Alts, | |
663 | Make_Case_Statement_Alternative (Loc, | |
664 | Discrete_Choices => | |
665 | New_Copy_List_Tree (Discrete_Choices (Var)), | |
666 | Statements => Stmts)); | |
667 | end Validate_Variant; | |
668 | ||
669 | --------------------------- | |
670 | -- Validate_Variant_Part -- | |
671 | --------------------------- | |
672 | ||
673 | procedure Validate_Variant_Part | |
674 | (Obj_Id : Entity_Id; | |
675 | Var_Part : Node_Id; | |
676 | Stmts : in out List_Id) | |
677 | is | |
678 | Vars : constant List_Id := Variants (Var_Part); | |
679 | Alts : List_Id; | |
680 | Var : Node_Id; | |
45ec05e1 | 681 | |
f16cb8df HK |
682 | begin |
683 | -- Assume that none of the variants are eligible for verification | |
c468e1fb | 684 | |
f16cb8df | 685 | Alts := No_List; |
45ec05e1 | 686 | |
f16cb8df | 687 | -- Validate variants |
45ec05e1 | 688 | |
f16cb8df HK |
689 | Var := First_Non_Pragma (Vars); |
690 | while Present (Var) loop | |
691 | Validate_Variant | |
692 | (Obj_Id => Obj_Id, | |
693 | Var => Var, | |
694 | Alts => Alts); | |
45ec05e1 | 695 | |
f16cb8df HK |
696 | Next_Non_Pragma (Var); |
697 | end loop; | |
45ec05e1 | 698 | |
f16cb8df HK |
699 | -- Even though individual variants may lack eligible components, the |
700 | -- alternatives must still be generated. | |
45ec05e1 | 701 | |
f16cb8df | 702 | pragma Assert (Present (Alts)); |
45ec05e1 | 703 | |
f16cb8df HK |
704 | -- Generate: |
705 | -- case Rec_Typ (Obj_Id).Discriminant is | |
706 | -- when Discrete_Choices_1 => | |
707 | -- Stmts_1 | |
708 | -- when Discrete_Choices_N => | |
709 | -- Stmts_N | |
710 | -- end case; | |
711 | ||
712 | Append_New_To (Stmts, | |
713 | Make_Case_Statement (Loc, | |
714 | Expression => | |
715 | Make_Selected_Component (Loc, | |
716 | Prefix => | |
717 | Unchecked_Convert_To (Rec_Typ, | |
718 | New_Occurrence_Of (Obj_Id, Loc)), | |
719 | Selector_Name => New_Copy_Tree (Name (Var_Part))), | |
720 | Alternatives => Alts)); | |
721 | end Validate_Variant_Part; | |
45ec05e1 | 722 | |
bbe008b6 | 723 | -- Local variables |
45ec05e1 | 724 | |
f16cb8df HK |
725 | Func_Id : constant Entity_Id := Make_Temporary (Loc, 'V'); |
726 | Obj_Id : constant Entity_Id := Make_Temporary (Loc, 'R'); | |
f2f9cdad | 727 | Comps : Node_Id; |
f16cb8df | 728 | Stmts : List_Id; |
f2f9cdad HK |
729 | Typ : Entity_Id; |
730 | Typ_Decl : Node_Id; | |
731 | Typ_Def : Node_Id; | |
732 | Typ_Ext : Node_Id; | |
45ec05e1 | 733 | |
bbe008b6 HK |
734 | -- Start of processing for Build_Record_VS_Func |
735 | ||
45ec05e1 | 736 | begin |
ce32ccfc | 737 | Typ := Validated_View (Rec_Typ); |
f2f9cdad HK |
738 | |
739 | -- Use the root type when dealing with a class-wide type | |
740 | ||
741 | if Is_Class_Wide_Type (Typ) then | |
66bd7af5 | 742 | Typ := Validated_View (Root_Type (Typ)); |
f2f9cdad HK |
743 | end if; |
744 | ||
745 | Typ_Decl := Declaration_Node (Typ); | |
746 | Typ_Def := Type_Definition (Typ_Decl); | |
747 | ||
748 | -- The components of a derived type are located in the extension part | |
749 | ||
750 | if Nkind (Typ_Def) = N_Derived_Type_Definition then | |
751 | Typ_Ext := Record_Extension_Part (Typ_Def); | |
752 | ||
753 | if Present (Typ_Ext) then | |
754 | Comps := Component_List (Typ_Ext); | |
755 | else | |
756 | Comps := Empty; | |
757 | end if; | |
758 | ||
759 | -- Otherwise the components are available in the definition | |
760 | ||
761 | else | |
762 | Comps := Component_List (Typ_Def); | |
763 | end if; | |
764 | ||
f16cb8df HK |
765 | -- The code generated by this routine is as follows: |
766 | -- | |
767 | -- function Func_Id (Obj_Id : Formal_Typ) return Boolean is | |
768 | -- begin | |
769 | -- if not Rec_Typ (Obj_Id).Discriminant_1'Valid[_Scalars] | |
770 | -- or else not Rec_Typ (Obj_Id).Discriminant_N'Valid[_Scalars] | |
771 | -- then | |
772 | -- return False; | |
773 | -- end if; | |
774 | -- | |
775 | -- if not Rec_Typ (Obj_Id).Component_1'Valid[_Scalars] | |
776 | -- or else not Rec_Typ (Obj_Id).Component_N'Valid[_Scalars] | |
777 | -- then | |
778 | -- return False; | |
779 | -- end if; | |
780 | -- | |
781 | -- case Discriminant_1 is | |
782 | -- when Choice_1 => | |
783 | -- if not Rec_Typ (Obj_Id).Component_1'Valid[_Scalars] | |
784 | -- or else not Rec_Typ (Obj_Id).Component_N'Valid[_Scalars] | |
785 | -- then | |
786 | -- return False; | |
787 | -- end if; | |
788 | -- | |
789 | -- case Discriminant_N is | |
790 | -- ... | |
791 | -- when Choice_N => | |
792 | -- ... | |
793 | -- end case; | |
794 | -- | |
795 | -- return True; | |
796 | -- end Func_Id; | |
797 | ||
798 | -- Assume that the record type lacks eligible components, discriminants, | |
799 | -- and variant parts. | |
800 | ||
801 | Stmts := No_List; | |
802 | ||
803 | -- Validate the discriminants | |
804 | ||
805 | if not Is_Unchecked_Union (Rec_Typ) then | |
806 | Validate_Fields | |
807 | (Obj_Id => Obj_Id, | |
f2f9cdad | 808 | Fields => Discriminant_Specifications (Typ_Decl), |
f16cb8df HK |
809 | Stmts => Stmts); |
810 | end if; | |
45ec05e1 | 811 | |
f16cb8df | 812 | -- Validate the components and variant parts |
45ec05e1 | 813 | |
f16cb8df HK |
814 | Validate_Component_List |
815 | (Obj_Id => Obj_Id, | |
f2f9cdad | 816 | Comp_List => Comps, |
f16cb8df HK |
817 | Stmts => Stmts); |
818 | ||
819 | -- Generate: | |
820 | -- return True; | |
821 | ||
822 | Append_New_To (Stmts, | |
45ec05e1 RD |
823 | Make_Simple_Return_Statement (Loc, |
824 | Expression => New_Occurrence_Of (Standard_True, Loc))); | |
825 | ||
f16cb8df HK |
826 | -- Generate: |
827 | -- function Func_Id (Obj_Id : Formal_Typ) return Boolean is | |
828 | -- begin | |
829 | -- Stmts | |
830 | -- end Func_Id; | |
831 | ||
2e02ab86 | 832 | Mutate_Ekind (Func_Id, E_Function); |
f16cb8df HK |
833 | Set_Is_Internal (Func_Id); |
834 | Set_Is_Pure (Func_Id); | |
835 | ||
836 | if not Debug_Generated_Code then | |
837 | Set_Debug_Info_Off (Func_Id); | |
838 | end if; | |
839 | ||
840 | Insert_Action (Attr, | |
45ec05e1 RD |
841 | Make_Subprogram_Body (Loc, |
842 | Specification => | |
843 | Make_Function_Specification (Loc, | |
844 | Defining_Unit_Name => Func_Id, | |
f16cb8df HK |
845 | Parameter_Specifications => New_List ( |
846 | Make_Parameter_Specification (Loc, | |
847 | Defining_Identifier => Obj_Id, | |
848 | Parameter_Type => New_Occurrence_Of (Formal_Typ, Loc))), | |
849 | Result_Definition => | |
850 | New_Occurrence_Of (Standard_Boolean, Loc)), | |
45ec05e1 RD |
851 | Declarations => New_List, |
852 | Handled_Statement_Sequence => | |
f16cb8df HK |
853 | Make_Handled_Sequence_Of_Statements (Loc, |
854 | Statements => Stmts)), | |
45ec05e1 RD |
855 | Suppress => Discriminant_Check); |
856 | ||
45ec05e1 RD |
857 | return Func_Id; |
858 | end Build_Record_VS_Func; | |
859 | ||
70482933 RK |
860 | ---------------------------------- |
861 | -- Compile_Stream_Body_In_Scope -- | |
862 | ---------------------------------- | |
863 | ||
864 | procedure Compile_Stream_Body_In_Scope | |
865 | (N : Node_Id; | |
866 | Decl : Node_Id; | |
fb632ef5 | 867 | Arr : Entity_Id) |
70482933 | 868 | is |
d6dffa66 HK |
869 | C_Type : constant Entity_Id := Base_Type (Component_Type (Arr)); |
870 | Curr : constant Entity_Id := Current_Scope; | |
871 | Install : Boolean := False; | |
872 | Scop : Entity_Id := Scope (Arr); | |
73f05f9f | 873 | |
70482933 RK |
874 | begin |
875 | if Is_Hidden (Arr) | |
876 | and then not In_Open_Scopes (Scop) | |
877 | and then Ekind (Scop) = E_Package | |
73f05f9f ES |
878 | then |
879 | Install := True; | |
73f05f9f | 880 | |
d6dffa66 HK |
881 | else |
882 | -- The component type may be private, in which case we install its | |
883 | -- full view to compile the subprogram. | |
3dddb11e | 884 | |
e3f94155 AC |
885 | -- The component type may be private, in which case we install its |
886 | -- full view to compile the subprogram. We do not do this if the | |
887 | -- type has a Stream_Convert pragma, which indicates that there are | |
888 | -- special stream-processing operations for that type (for example | |
889 | -- Unbounded_String and its wide varieties). | |
890 | ||
09cca56d ES |
891 | -- We don't install the package either if array type and element |
892 | -- type come from the same package, and the original array type is | |
893 | -- private, because in this case the underlying type Arr is | |
894 | -- itself a full view, which carries the full view of the component. | |
895 | ||
73f05f9f | 896 | Scop := Scope (C_Type); |
3dddb11e | 897 | |
73f05f9f ES |
898 | if Is_Private_Type (C_Type) |
899 | and then Present (Full_View (C_Type)) | |
900 | and then not In_Open_Scopes (Scop) | |
901 | and then Ekind (Scop) = E_Package | |
e3f94155 | 902 | and then No (Get_Stream_Convert_Pragma (C_Type)) |
73f05f9f | 903 | then |
09cca56d ES |
904 | if Scope (Arr) = Scope (C_Type) |
905 | and then Is_Private_Type (Etype (Prefix (N))) | |
906 | and then Full_View (Etype (Prefix (N))) = Arr | |
907 | then | |
908 | null; | |
909 | ||
910 | else | |
911 | Install := True; | |
912 | end if; | |
73f05f9f ES |
913 | end if; |
914 | end if; | |
915 | ||
916 | -- If we are within an instance body, then all visibility has been | |
917 | -- established already and there is no need to install the package. | |
918 | ||
d6dffa66 | 919 | if Install and then not In_Instance_Body then |
31104818 | 920 | Push_Scope (Scop); |
70482933 RK |
921 | Install_Visible_Declarations (Scop); |
922 | Install_Private_Declarations (Scop); | |
70482933 RK |
923 | |
924 | -- The entities in the package are now visible, but the generated | |
925 | -- stream entity must appear in the current scope (usually an | |
926 | -- enclosing stream function) so that itypes all have their proper | |
927 | -- scopes. | |
928 | ||
31104818 | 929 | Push_Scope (Curr); |
73f05f9f ES |
930 | else |
931 | Install := False; | |
70482933 RK |
932 | end if; |
933 | ||
fb632ef5 | 934 | Insert_Action (N, Decl); |
70482933 | 935 | |
73f05f9f | 936 | if Install then |
70482933 RK |
937 | |
938 | -- Remove extra copy of current scope, and package itself | |
939 | ||
940 | Pop_Scope; | |
941 | End_Package_Scope (Scop); | |
942 | end if; | |
943 | end Compile_Stream_Body_In_Scope; | |
944 | ||
29f2d76c SB |
945 | ----------------------------------- |
946 | -- Default_Streaming_Unavailable -- | |
947 | ----------------------------------- | |
948 | ||
949 | function Default_Streaming_Unavailable (Typ : Entity_Id) return Boolean is | |
950 | Btyp : constant Entity_Id := Implementation_Base_Type (Typ); | |
951 | begin | |
952 | if Is_Immutably_Limited_Type (Btyp) | |
953 | and then not Is_Tagged_Type (Btyp) | |
954 | and then not (Ekind (Btyp) = E_Record_Type | |
955 | and then Present (Corresponding_Concurrent_Type (Btyp))) | |
956 | then | |
957 | pragma Assert (In_Instance_Body); | |
958 | return True; | |
959 | end if; | |
960 | return False; | |
961 | end Default_Streaming_Unavailable; | |
962 | ||
7ce611e2 ES |
963 | ----------------------------------- |
964 | -- Expand_Access_To_Protected_Op -- | |
965 | ----------------------------------- | |
966 | ||
967 | procedure Expand_Access_To_Protected_Op | |
968 | (N : Node_Id; | |
969 | Pref : Node_Id; | |
970 | Typ : Entity_Id) | |
971 | is | |
972 | -- The value of the attribute_reference is a record containing two | |
973 | -- fields: an access to the protected object, and an access to the | |
d9206abb JM |
974 | -- subprogram itself. The prefix is an identifier or a selected |
975 | -- component. | |
976 | ||
977 | function Has_By_Protected_Procedure_Prefixed_View return Boolean; | |
978 | -- Determine whether Pref denotes the prefixed class-wide interface | |
979 | -- view of a procedure with synchronization kind By_Protected_Procedure. | |
980 | ||
981 | ---------------------------------------------- | |
982 | -- Has_By_Protected_Procedure_Prefixed_View -- | |
983 | ---------------------------------------------- | |
984 | ||
985 | function Has_By_Protected_Procedure_Prefixed_View return Boolean is | |
986 | begin | |
987 | return Nkind (Pref) = N_Selected_Component | |
988 | and then Nkind (Prefix (Pref)) in N_Has_Entity | |
989 | and then Present (Entity (Prefix (Pref))) | |
990 | and then Is_Class_Wide_Type (Etype (Entity (Prefix (Pref)))) | |
991 | and then (Is_Synchronized_Interface (Etype (Entity (Prefix (Pref)))) | |
992 | or else | |
993 | Is_Protected_Interface (Etype (Entity (Prefix (Pref))))) | |
994 | and then Is_By_Protected_Procedure (Entity (Selector_Name (Pref))); | |
995 | end Has_By_Protected_Procedure_Prefixed_View; | |
996 | ||
997 | -- Local variables | |
7ce611e2 ES |
998 | |
999 | Loc : constant Source_Ptr := Sloc (N); | |
1000 | Agg : Node_Id; | |
1001 | Btyp : constant Entity_Id := Base_Type (Typ); | |
aab8cf8b | 1002 | Sub : Entity_Id := Empty; |
e657b693 | 1003 | Sub_Ref : Node_Id; |
7ce611e2 ES |
1004 | E_T : constant Entity_Id := Equivalent_Type (Btyp); |
1005 | Acc : constant Entity_Id := | |
1006 | Etype (Next_Component (First_Component (E_T))); | |
1007 | Obj_Ref : Node_Id; | |
1008 | Curr : Entity_Id; | |
1009 | ||
7ce611e2 ES |
1010 | -- Start of processing for Expand_Access_To_Protected_Op |
1011 | ||
1012 | begin | |
6e1ee5c3 AC |
1013 | -- Within the body of the protected type, the prefix designates a local |
1014 | -- operation, and the object is the first parameter of the corresponding | |
1015 | -- protected body of the current enclosing operation. | |
7ce611e2 ES |
1016 | |
1017 | if Is_Entity_Name (Pref) then | |
2290a0fe AC |
1018 | -- All indirect calls are external calls, so must do locking and |
1019 | -- barrier reevaluation, even if the 'Access occurs within the | |
1020 | -- protected body. Hence the call to External_Subprogram, as opposed | |
1021 | -- to Protected_Body_Subprogram, below. See RM-9.5(5). This means | |
1022 | -- that indirect calls from within the same protected body will | |
1023 | -- deadlock, as allowed by RM-9.5.1(8,15,17). | |
1024 | ||
1025 | Sub := New_Occurrence_Of (External_Subprogram (Entity (Pref)), Loc); | |
7ce611e2 | 1026 | |
21d27997 RD |
1027 | -- Don't traverse the scopes when the attribute occurs within an init |
1028 | -- proc, because we directly use the _init formal of the init proc in | |
1029 | -- that case. | |
1030 | ||
7ce611e2 | 1031 | Curr := Current_Scope; |
21d27997 RD |
1032 | if not Is_Init_Proc (Curr) then |
1033 | pragma Assert (In_Open_Scopes (Scope (Entity (Pref)))); | |
1034 | ||
1035 | while Scope (Curr) /= Scope (Entity (Pref)) loop | |
1036 | Curr := Scope (Curr); | |
1037 | end loop; | |
1038 | end if; | |
7ce611e2 ES |
1039 | |
1040 | -- In case of protected entries the first formal of its Protected_ | |
1041 | -- Body_Subprogram is the address of the object. | |
1042 | ||
1043 | if Ekind (Curr) = E_Entry then | |
1044 | Obj_Ref := | |
1045 | New_Occurrence_Of | |
1046 | (First_Formal | |
1047 | (Protected_Body_Subprogram (Curr)), Loc); | |
1048 | ||
21d27997 RD |
1049 | -- If the current scope is an init proc, then use the address of the |
1050 | -- _init formal as the object reference. | |
1051 | ||
1052 | elsif Is_Init_Proc (Curr) then | |
1053 | Obj_Ref := | |
1054 | Make_Attribute_Reference (Loc, | |
1055 | Prefix => New_Occurrence_Of (First_Formal (Curr), Loc), | |
1056 | Attribute_Name => Name_Address); | |
1057 | ||
7ce611e2 ES |
1058 | -- In case of protected subprograms the first formal of its |
1059 | -- Protected_Body_Subprogram is the object and we get its address. | |
1060 | ||
1061 | else | |
1062 | Obj_Ref := | |
1063 | Make_Attribute_Reference (Loc, | |
1064 | Prefix => | |
1065 | New_Occurrence_Of | |
1066 | (First_Formal | |
1067 | (Protected_Body_Subprogram (Curr)), Loc), | |
1068 | Attribute_Name => Name_Address); | |
1069 | end if; | |
1070 | ||
d9206abb JM |
1071 | elsif Has_By_Protected_Procedure_Prefixed_View then |
1072 | Obj_Ref := | |
1073 | Make_Attribute_Reference (Loc, | |
1074 | Prefix => Relocate_Node (Prefix (Pref)), | |
1075 | Attribute_Name => Name_Address); | |
1076 | ||
1077 | -- Analyze the object address with expansion disabled. Required | |
1078 | -- because its expansion would displace the pointer to the object, | |
1079 | -- which is not correct at this stage since the object type is a | |
1080 | -- class-wide interface type and we are dispatching a call to a | |
1081 | -- thunk (which would erroneously displace the pointer again). | |
1082 | ||
1083 | Expander_Mode_Save_And_Set (False); | |
1084 | Analyze (Obj_Ref); | |
1085 | Set_Analyzed (Obj_Ref); | |
1086 | Expander_Mode_Restore; | |
1087 | ||
7ce611e2 ES |
1088 | -- Case where the prefix is not an entity name. Find the |
1089 | -- version of the protected operation to be called from | |
1090 | -- outside the protected object. | |
1091 | ||
1092 | else | |
1093 | Sub := | |
1094 | New_Occurrence_Of | |
1095 | (External_Subprogram | |
1096 | (Entity (Selector_Name (Pref))), Loc); | |
1097 | ||
1098 | Obj_Ref := | |
1099 | Make_Attribute_Reference (Loc, | |
1100 | Prefix => Relocate_Node (Prefix (Pref)), | |
1101 | Attribute_Name => Name_Address); | |
1102 | end if; | |
1103 | ||
d9206abb JM |
1104 | if Has_By_Protected_Procedure_Prefixed_View then |
1105 | declare | |
1106 | Ctrl_Tag : Node_Id := Duplicate_Subexpr (Prefix (Pref)); | |
1107 | Prim_Addr : Node_Id; | |
1108 | Subp : constant Entity_Id := Entity (Selector_Name (Pref)); | |
1109 | Typ : constant Entity_Id := | |
1110 | Etype (Etype (Entity (Prefix (Pref)))); | |
1111 | begin | |
1112 | -- The target subprogram is a thunk; retrieve its address from | |
1113 | -- its secondary dispatch table slot. | |
1114 | ||
1115 | Build_Get_Prim_Op_Address (Loc, | |
1116 | Typ => Typ, | |
1117 | Tag_Node => Ctrl_Tag, | |
1118 | Position => DT_Position (Subp), | |
1119 | New_Node => Prim_Addr); | |
1120 | ||
1121 | -- Mark the access to the target subprogram as an access to the | |
1122 | -- dispatch table and perform an unchecked type conversion to such | |
1123 | -- access type. This is required to allow the backend to properly | |
1124 | -- identify and handle the access to the dispatch table slot on | |
1125 | -- targets where the dispatch table contains descriptors (instead | |
1126 | -- of pointers). | |
1127 | ||
1128 | Set_Is_Dispatch_Table_Entity (Acc); | |
1129 | Sub_Ref := Unchecked_Convert_To (Acc, Prim_Addr); | |
1130 | Analyze (Sub_Ref); | |
1131 | ||
1132 | Agg := | |
1133 | Make_Aggregate (Loc, | |
1134 | Expressions => New_List (Obj_Ref, Sub_Ref)); | |
1135 | end; | |
1136 | ||
1137 | -- Common case | |
e657b693 | 1138 | |
d9206abb JM |
1139 | else |
1140 | Sub_Ref := | |
1141 | Make_Attribute_Reference (Loc, | |
1142 | Prefix => Sub, | |
1143 | Attribute_Name => Name_Access); | |
e657b693 | 1144 | |
d9206abb JM |
1145 | -- We set the type of the access reference to the already generated |
1146 | -- access_to_subprogram type, and declare the reference analyzed, | |
1147 | -- to prevent further expansion when the enclosing aggregate is | |
1148 | -- analyzed. | |
e657b693 | 1149 | |
d9206abb JM |
1150 | Set_Etype (Sub_Ref, Acc); |
1151 | Set_Analyzed (Sub_Ref); | |
7ce611e2 | 1152 | |
d9206abb JM |
1153 | Agg := |
1154 | Make_Aggregate (Loc, | |
1155 | Expressions => New_List (Obj_Ref, Sub_Ref)); | |
1f92d7f2 | 1156 | |
d9206abb JM |
1157 | -- Sub_Ref has been marked as analyzed, but we still need to make |
1158 | -- sure Sub is correctly frozen. | |
1159 | ||
1160 | Freeze_Before (N, Entity (Sub)); | |
1161 | end if; | |
1f92d7f2 | 1162 | |
7ce611e2 | 1163 | Rewrite (N, Agg); |
7ce611e2 ES |
1164 | Analyze_And_Resolve (N, E_T); |
1165 | ||
f7e71125 AC |
1166 | -- For subsequent analysis, the node must retain its type. The backend |
1167 | -- will replace it with the equivalent type where needed. | |
7ce611e2 ES |
1168 | |
1169 | Set_Etype (N, Typ); | |
1170 | end Expand_Access_To_Protected_Op; | |
1171 | ||
70482933 RK |
1172 | -------------------------- |
1173 | -- Expand_Fpt_Attribute -- | |
1174 | -------------------------- | |
1175 | ||
1176 | procedure Expand_Fpt_Attribute | |
1177 | (N : Node_Id; | |
65f01153 | 1178 | Pkg : RE_Id; |
fbf5a39b | 1179 | Nam : Name_Id; |
70482933 RK |
1180 | Args : List_Id) |
1181 | is | |
1182 | Loc : constant Source_Ptr := Sloc (N); | |
1183 | Typ : constant Entity_Id := Etype (N); | |
70482933 RK |
1184 | Fnm : Node_Id; |
1185 | ||
1186 | begin | |
65f01153 RD |
1187 | -- The function name is the selected component Attr_xxx.yyy where |
1188 | -- Attr_xxx is the package name, and yyy is the argument Nam. | |
70482933 RK |
1189 | |
1190 | -- Note: it would be more usual to have separate RE entries for each | |
1191 | -- of the entities in the Fat packages, but first they have identical | |
1192 | -- names (so we would have to have lots of renaming declarations to | |
1193 | -- meet the normal RE rule of separate names for all runtime entities), | |
a90bd866 | 1194 | -- and second there would be an awful lot of them. |
70482933 | 1195 | |
70482933 RK |
1196 | Fnm := |
1197 | Make_Selected_Component (Loc, | |
e4494292 | 1198 | Prefix => New_Occurrence_Of (RTE (Pkg), Loc), |
fbf5a39b | 1199 | Selector_Name => Make_Identifier (Loc, Nam)); |
70482933 RK |
1200 | |
1201 | -- The generated call is given the provided set of parameters, and then | |
6a987d78 | 1202 | -- wrapped in a conversion which converts the result to the target type. |
70482933 RK |
1203 | |
1204 | Rewrite (N, | |
6a987d78 | 1205 | Convert_To (Typ, |
70482933 | 1206 | Make_Function_Call (Loc, |
65f01153 | 1207 | Name => Fnm, |
70482933 RK |
1208 | Parameter_Associations => Args))); |
1209 | ||
1210 | Analyze_And_Resolve (N, Typ); | |
70482933 RK |
1211 | end Expand_Fpt_Attribute; |
1212 | ||
1213 | ---------------------------- | |
1214 | -- Expand_Fpt_Attribute_R -- | |
1215 | ---------------------------- | |
1216 | ||
1217 | -- The single argument is converted to its root type to call the | |
1218 | -- appropriate runtime function, with the actual call being built | |
1219 | -- by Expand_Fpt_Attribute | |
1220 | ||
1221 | procedure Expand_Fpt_Attribute_R (N : Node_Id) is | |
90cb252f | 1222 | E1 : constant Node_Id := First (Expressions (N)); |
65f01153 RD |
1223 | Ftp : Entity_Id; |
1224 | Pkg : RE_Id; | |
70482933 | 1225 | begin |
65f01153 | 1226 | Find_Fat_Info (Etype (E1), Ftp, Pkg); |
fbf5a39b | 1227 | Expand_Fpt_Attribute |
65f01153 RD |
1228 | (N, Pkg, Attribute_Name (N), |
1229 | New_List (Unchecked_Convert_To (Ftp, Relocate_Node (E1)))); | |
70482933 RK |
1230 | end Expand_Fpt_Attribute_R; |
1231 | ||
1232 | ----------------------------- | |
1233 | -- Expand_Fpt_Attribute_RI -- | |
1234 | ----------------------------- | |
1235 | ||
1236 | -- The first argument is converted to its root type and the second | |
1237 | -- argument is converted to standard long long integer to call the | |
1238 | -- appropriate runtime function, with the actual call being built | |
1239 | -- by Expand_Fpt_Attribute | |
1240 | ||
1241 | procedure Expand_Fpt_Attribute_RI (N : Node_Id) is | |
90cb252f PT |
1242 | E1 : constant Node_Id := First (Expressions (N)); |
1243 | E2 : constant Node_Id := Next (E1); | |
65f01153 RD |
1244 | Ftp : Entity_Id; |
1245 | Pkg : RE_Id; | |
70482933 | 1246 | begin |
65f01153 | 1247 | Find_Fat_Info (Etype (E1), Ftp, Pkg); |
fbf5a39b | 1248 | Expand_Fpt_Attribute |
65f01153 | 1249 | (N, Pkg, Attribute_Name (N), |
fbf5a39b | 1250 | New_List ( |
65f01153 | 1251 | Unchecked_Convert_To (Ftp, Relocate_Node (E1)), |
fbf5a39b | 1252 | Unchecked_Convert_To (Standard_Integer, Relocate_Node (E2)))); |
70482933 RK |
1253 | end Expand_Fpt_Attribute_RI; |
1254 | ||
1255 | ----------------------------- | |
1256 | -- Expand_Fpt_Attribute_RR -- | |
1257 | ----------------------------- | |
1258 | ||
0669bebe | 1259 | -- The two arguments are converted to their root types to call the |
70482933 RK |
1260 | -- appropriate runtime function, with the actual call being built |
1261 | -- by Expand_Fpt_Attribute | |
1262 | ||
1263 | procedure Expand_Fpt_Attribute_RR (N : Node_Id) is | |
d436b30d AC |
1264 | E1 : constant Node_Id := First (Expressions (N)); |
1265 | E2 : constant Node_Id := Next (E1); | |
65f01153 RD |
1266 | Ftp : Entity_Id; |
1267 | Pkg : RE_Id; | |
d436b30d | 1268 | |
70482933 | 1269 | begin |
65f01153 | 1270 | Find_Fat_Info (Etype (E1), Ftp, Pkg); |
fbf5a39b | 1271 | Expand_Fpt_Attribute |
65f01153 | 1272 | (N, Pkg, Attribute_Name (N), |
fbf5a39b | 1273 | New_List ( |
65f01153 RD |
1274 | Unchecked_Convert_To (Ftp, Relocate_Node (E1)), |
1275 | Unchecked_Convert_To (Ftp, Relocate_Node (E2)))); | |
70482933 RK |
1276 | end Expand_Fpt_Attribute_RR; |
1277 | ||
d436b30d AC |
1278 | --------------------------------- |
1279 | -- Expand_Loop_Entry_Attribute -- | |
1280 | --------------------------------- | |
1281 | ||
aa9b151a | 1282 | procedure Expand_Loop_Entry_Attribute (N : Node_Id) is |
d436b30d AC |
1283 | procedure Build_Conditional_Block |
1284 | (Loc : Source_Ptr; | |
1285 | Cond : Node_Id; | |
1286 | Loop_Stmt : Node_Id; | |
1287 | If_Stmt : out Node_Id; | |
1288 | Blk_Stmt : out Node_Id); | |
1289 | -- Create a block Blk_Stmt with an empty declarative list and a single | |
1290 | -- loop Loop_Stmt. The block is encased in an if statement If_Stmt with | |
1291 | -- condition Cond. If_Stmt is Empty when there is no condition provided. | |
1292 | ||
1293 | function Is_Array_Iteration (N : Node_Id) return Boolean; | |
1294 | -- Determine whether loop statement N denotes an Ada 2012 iteration over | |
1295 | -- an array object. | |
1296 | ||
1297 | ----------------------------- | |
1298 | -- Build_Conditional_Block -- | |
1299 | ----------------------------- | |
1300 | ||
1301 | procedure Build_Conditional_Block | |
1302 | (Loc : Source_Ptr; | |
1303 | Cond : Node_Id; | |
1304 | Loop_Stmt : Node_Id; | |
1305 | If_Stmt : out Node_Id; | |
1306 | Blk_Stmt : out Node_Id) | |
1307 | is | |
1308 | begin | |
1309 | -- Do not reanalyze the original loop statement because it is simply | |
1310 | -- being relocated. | |
1311 | ||
1312 | Set_Analyzed (Loop_Stmt); | |
1313 | ||
1314 | Blk_Stmt := | |
1315 | Make_Block_Statement (Loc, | |
1316 | Declarations => New_List, | |
1317 | Handled_Statement_Sequence => | |
1318 | Make_Handled_Sequence_Of_Statements (Loc, | |
1319 | Statements => New_List (Loop_Stmt))); | |
1320 | ||
1321 | if Present (Cond) then | |
1322 | If_Stmt := | |
1323 | Make_If_Statement (Loc, | |
1324 | Condition => Cond, | |
1325 | Then_Statements => New_List (Blk_Stmt)); | |
1326 | else | |
1327 | If_Stmt := Empty; | |
1328 | end if; | |
1329 | end Build_Conditional_Block; | |
1330 | ||
1331 | ------------------------ | |
1332 | -- Is_Array_Iteration -- | |
1333 | ------------------------ | |
1334 | ||
1335 | function Is_Array_Iteration (N : Node_Id) return Boolean is | |
1336 | Stmt : constant Node_Id := Original_Node (N); | |
1337 | Iter : Node_Id; | |
1338 | ||
1339 | begin | |
1340 | if Nkind (Stmt) = N_Loop_Statement | |
1341 | and then Present (Iteration_Scheme (Stmt)) | |
1342 | and then Present (Iterator_Specification (Iteration_Scheme (Stmt))) | |
1343 | then | |
1344 | Iter := Iterator_Specification (Iteration_Scheme (Stmt)); | |
1345 | ||
1346 | return | |
1347 | Of_Present (Iter) and then Is_Array_Type (Etype (Name (Iter))); | |
1348 | end if; | |
1349 | ||
1350 | return False; | |
1351 | end Is_Array_Iteration; | |
1352 | ||
1353 | -- Local variables | |
1354 | ||
aa9b151a | 1355 | Pref : constant Node_Id := Prefix (N); |
0f83b044 AC |
1356 | Base_Typ : constant Entity_Id := Base_Type (Etype (Pref)); |
1357 | Exprs : constant List_Id := Expressions (N); | |
1358 | Aux_Decl : Node_Id; | |
dcd5fd67 | 1359 | Blk : Node_Id := Empty; |
d436b30d AC |
1360 | Decls : List_Id; |
1361 | Installed : Boolean; | |
1362 | Loc : Source_Ptr; | |
1363 | Loop_Id : Entity_Id; | |
1364 | Loop_Stmt : Node_Id; | |
31e358e1 | 1365 | Result : Node_Id := Empty; |
d436b30d AC |
1366 | Scheme : Node_Id; |
1367 | Temp_Decl : Node_Id; | |
1368 | Temp_Id : Entity_Id; | |
1369 | ||
1370 | -- Start of processing for Expand_Loop_Entry_Attribute | |
1371 | ||
1372 | begin | |
1373 | -- Step 1: Find the related loop | |
1374 | ||
1375 | -- The loop label variant of attribute 'Loop_Entry already has all the | |
1376 | -- information in its expression. | |
1377 | ||
1378 | if Present (Exprs) then | |
1379 | Loop_Id := Entity (First (Exprs)); | |
1380 | Loop_Stmt := Label_Construct (Parent (Loop_Id)); | |
1381 | ||
0f83b044 AC |
1382 | -- Climb the parent chain to find the nearest enclosing loop. Skip |
1383 | -- all internally generated loops for quantified expressions and for | |
1384 | -- element iterators over multidimensional arrays because the pragma | |
1385 | -- applies to source loop. | |
d436b30d AC |
1386 | |
1387 | else | |
aa9b151a | 1388 | Loop_Stmt := N; |
d436b30d AC |
1389 | while Present (Loop_Stmt) loop |
1390 | if Nkind (Loop_Stmt) = N_Loop_Statement | |
ae5115dd AC |
1391 | and then Nkind (Original_Node (Loop_Stmt)) = N_Loop_Statement |
1392 | and then Comes_From_Source (Original_Node (Loop_Stmt)) | |
d436b30d AC |
1393 | then |
1394 | exit; | |
1395 | end if; | |
1396 | ||
1397 | Loop_Stmt := Parent (Loop_Stmt); | |
1398 | end loop; | |
1399 | ||
1400 | Loop_Id := Entity (Identifier (Loop_Stmt)); | |
1401 | end if; | |
1402 | ||
1403 | Loc := Sloc (Loop_Stmt); | |
1404 | ||
1405 | -- Step 2: Transform the loop | |
1406 | ||
1407 | -- The loop has already been transformed during the expansion of a prior | |
1408 | -- 'Loop_Entry attribute. Retrieve the declarative list of the block. | |
1409 | ||
1410 | if Has_Loop_Entry_Attributes (Loop_Id) then | |
3d67b239 AC |
1411 | |
1412 | -- When the related loop name appears as the argument of attribute | |
1413 | -- Loop_Entry, the corresponding label construct is the generated | |
0d5fbf52 | 1414 | -- block statement. This is because the expander reuses the label. |
3d67b239 | 1415 | |
24778dbb AC |
1416 | if Nkind (Loop_Stmt) = N_Block_Statement then |
1417 | Decls := Declarations (Loop_Stmt); | |
3d67b239 AC |
1418 | |
1419 | -- In all other cases, the loop must appear in the handled sequence | |
1420 | -- of statements of the generated block. | |
1421 | ||
24778dbb | 1422 | else |
3d67b239 AC |
1423 | pragma Assert |
1424 | (Nkind (Parent (Loop_Stmt)) = N_Handled_Sequence_Of_Statements | |
fc999c5d RD |
1425 | and then |
1426 | Nkind (Parent (Parent (Loop_Stmt))) = N_Block_Statement); | |
24778dbb AC |
1427 | |
1428 | Decls := Declarations (Parent (Parent (Loop_Stmt))); | |
1429 | end if; | |
1430 | ||
d436b30d AC |
1431 | -- Transform the loop into a conditional block |
1432 | ||
1433 | else | |
1434 | Set_Has_Loop_Entry_Attributes (Loop_Id); | |
1435 | Scheme := Iteration_Scheme (Loop_Stmt); | |
1436 | ||
3d67b239 AC |
1437 | -- Infinite loops are transformed into: |
1438 | ||
1439 | -- declare | |
1440 | -- Temp1 : constant <type of Pref1> := <Pref1>; | |
1441 | -- . . . | |
1442 | -- TempN : constant <type of PrefN> := <PrefN>; | |
1443 | -- begin | |
1444 | -- loop | |
1445 | -- <original source statements with attribute rewrites> | |
1446 | -- end loop; | |
1447 | -- end; | |
1448 | ||
1449 | if No (Scheme) then | |
1450 | Build_Conditional_Block (Loc, | |
1451 | Cond => Empty, | |
1452 | Loop_Stmt => Relocate_Node (Loop_Stmt), | |
1453 | If_Stmt => Result, | |
1454 | Blk_Stmt => Blk); | |
1455 | ||
1456 | Result := Blk; | |
1457 | ||
d436b30d AC |
1458 | -- While loops are transformed into: |
1459 | ||
fd7215d7 AC |
1460 | -- function Fnn return Boolean is |
1461 | -- begin | |
1462 | -- <condition actions> | |
1463 | -- return <condition>; | |
1464 | -- end Fnn; | |
1465 | ||
1466 | -- if Fnn then | |
d436b30d AC |
1467 | -- declare |
1468 | -- Temp1 : constant <type of Pref1> := <Pref1>; | |
1469 | -- . . . | |
1470 | -- TempN : constant <type of PrefN> := <PrefN>; | |
1471 | -- begin | |
1472 | -- loop | |
1473 | -- <original source statements with attribute rewrites> | |
fd7215d7 | 1474 | -- exit when not Fnn; |
d436b30d AC |
1475 | -- end loop; |
1476 | -- end; | |
1477 | -- end if; | |
1478 | ||
1479 | -- Note that loops over iterators and containers are already | |
1480 | -- converted into while loops. | |
1481 | ||
3d67b239 | 1482 | elsif Present (Condition (Scheme)) then |
d436b30d | 1483 | declare |
fd7215d7 AC |
1484 | Func_Decl : Node_Id; |
1485 | Func_Id : Entity_Id; | |
1486 | Stmts : List_Id; | |
d436b30d AC |
1487 | |
1488 | begin | |
c961d820 EB |
1489 | Func_Id := Make_Temporary (Loc, 'F'); |
1490 | ||
fd7215d7 AC |
1491 | -- Wrap the condition of the while loop in a Boolean function. |
1492 | -- This avoids the duplication of the same code which may lead | |
1493 | -- to gigi issues with respect to multiple declaration of the | |
1494 | -- same entity in the presence of side effects or checks. Note | |
75f6bfce EB |
1495 | -- that the condition actions must also be relocated into the |
1496 | -- wrapping function because they may contain itypes, e.g. in | |
1497 | -- the case of a comparison involving slices. | |
fd7215d7 AC |
1498 | |
1499 | -- Generate: | |
1500 | -- <condition actions> | |
1501 | -- return <condition>; | |
1502 | ||
1503 | if Present (Condition_Actions (Scheme)) then | |
1504 | Stmts := Condition_Actions (Scheme); | |
1505 | else | |
1506 | Stmts := New_List; | |
1507 | end if; | |
1508 | ||
1509 | Append_To (Stmts, | |
1510 | Make_Simple_Return_Statement (Loc, | |
c961d820 EB |
1511 | Expression => |
1512 | New_Copy_Tree (Condition (Scheme), | |
1513 | New_Scope => Func_Id))); | |
fd7215d7 AC |
1514 | |
1515 | -- Generate: | |
1516 | -- function Fnn return Boolean is | |
1517 | -- begin | |
1518 | -- <Stmts> | |
1519 | -- end Fnn; | |
1520 | ||
fd7215d7 AC |
1521 | Func_Decl := |
1522 | Make_Subprogram_Body (Loc, | |
1523 | Specification => | |
1524 | Make_Function_Specification (Loc, | |
1525 | Defining_Unit_Name => Func_Id, | |
1526 | Result_Definition => | |
1527 | New_Occurrence_Of (Standard_Boolean, Loc)), | |
1528 | Declarations => Empty_List, | |
1529 | Handled_Statement_Sequence => | |
1530 | Make_Handled_Sequence_Of_Statements (Loc, | |
1531 | Statements => Stmts)); | |
1532 | ||
1533 | -- The function is inserted before the related loop. Make sure | |
1534 | -- to analyze it in the context of the loop's enclosing scope. | |
1535 | ||
1536 | Push_Scope (Scope (Loop_Id)); | |
1537 | Insert_Action (Loop_Stmt, Func_Decl); | |
1538 | Pop_Scope; | |
1539 | ||
07511699 GD |
1540 | -- The analysis of the condition may have generated entities |
1541 | -- (such as itypes) that are now used within the function. | |
1542 | -- Adjust their scopes accordingly so that their use appears | |
1543 | -- in their scope of definition. | |
b6b011dd ES |
1544 | |
1545 | declare | |
07511699 | 1546 | Ent : Entity_Id; |
b6b011dd ES |
1547 | |
1548 | begin | |
07511699 GD |
1549 | Ent := First_Entity (Loop_Id); |
1550 | ||
1551 | while Present (Ent) loop | |
1552 | -- Various entities that now occur within the function | |
1553 | -- need to have their scope reset, but not all entities | |
1554 | -- associated with Loop_Id are now inside the function. | |
1555 | -- The function entity itself and loop parameters can | |
1556 | -- be outside the function, and there may be others. | |
1557 | -- It's not clear how the determination of what entity | |
1558 | -- scopes need to be adjusted can be made accurately. | |
1559 | -- Perhaps it will be necessary to traverse the function | |
1560 | -- body to find the exact entities whose scopes need to | |
1561 | -- be reset to the function's Entity_Id. ??? | |
1562 | ||
1563 | if Ekind (Ent) /= E_Loop_Parameter | |
1564 | and then Ent /= Func_Id | |
1565 | then | |
1566 | Set_Scope (Ent, Func_Id); | |
b6b011dd | 1567 | end if; |
07511699 GD |
1568 | |
1569 | Next_Entity (Ent); | |
b6b011dd ES |
1570 | end loop; |
1571 | end; | |
1572 | ||
d436b30d AC |
1573 | -- Transform the original while loop into an infinite loop |
1574 | -- where the last statement checks the negated condition. This | |
1575 | -- placement ensures that the condition will not be evaluated | |
1576 | -- twice on the first iteration. | |
1577 | ||
fd7215d7 AC |
1578 | Set_Iteration_Scheme (Loop_Stmt, Empty); |
1579 | Scheme := Empty; | |
1580 | ||
d436b30d | 1581 | -- Generate: |
fd7215d7 | 1582 | -- exit when not Fnn; |
d436b30d AC |
1583 | |
1584 | Append_To (Statements (Loop_Stmt), | |
1585 | Make_Exit_Statement (Loc, | |
fd7215d7 AC |
1586 | Condition => |
1587 | Make_Op_Not (Loc, | |
1588 | Right_Opnd => | |
1589 | Make_Function_Call (Loc, | |
1590 | Name => New_Occurrence_Of (Func_Id, Loc))))); | |
d436b30d AC |
1591 | |
1592 | Build_Conditional_Block (Loc, | |
fd7215d7 AC |
1593 | Cond => |
1594 | Make_Function_Call (Loc, | |
1595 | Name => New_Occurrence_Of (Func_Id, Loc)), | |
d436b30d AC |
1596 | Loop_Stmt => Relocate_Node (Loop_Stmt), |
1597 | If_Stmt => Result, | |
1598 | Blk_Stmt => Blk); | |
1599 | end; | |
1600 | ||
1601 | -- Ada 2012 iteration over an array is transformed into: | |
1602 | ||
1603 | -- if <Array_Nam>'Length (1) > 0 | |
1604 | -- and then <Array_Nam>'Length (N) > 0 | |
1605 | -- then | |
1606 | -- declare | |
1607 | -- Temp1 : constant <type of Pref1> := <Pref1>; | |
1608 | -- . . . | |
1609 | -- TempN : constant <type of PrefN> := <PrefN>; | |
1610 | -- begin | |
1611 | -- for X in ... loop -- multiple loops depending on dims | |
1612 | -- <original source statements with attribute rewrites> | |
1613 | -- end loop; | |
1614 | -- end; | |
1615 | -- end if; | |
1616 | ||
1617 | elsif Is_Array_Iteration (Loop_Stmt) then | |
1618 | declare | |
1619 | Array_Nam : constant Entity_Id := | |
1620 | Entity (Name (Iterator_Specification | |
1621 | (Iteration_Scheme (Original_Node (Loop_Stmt))))); | |
1622 | Num_Dims : constant Pos := | |
1623 | Number_Dimensions (Etype (Array_Nam)); | |
1624 | Cond : Node_Id := Empty; | |
1625 | Check : Node_Id; | |
1626 | ||
1627 | begin | |
1628 | -- Generate a check which determines whether all dimensions of | |
1629 | -- the array are non-null. | |
1630 | ||
1631 | for Dim in 1 .. Num_Dims loop | |
1632 | Check := | |
1633 | Make_Op_Gt (Loc, | |
1634 | Left_Opnd => | |
1635 | Make_Attribute_Reference (Loc, | |
e4494292 | 1636 | Prefix => New_Occurrence_Of (Array_Nam, Loc), |
d436b30d AC |
1637 | Attribute_Name => Name_Length, |
1638 | Expressions => New_List ( | |
1639 | Make_Integer_Literal (Loc, Dim))), | |
1640 | Right_Opnd => | |
1641 | Make_Integer_Literal (Loc, 0)); | |
1642 | ||
1643 | if No (Cond) then | |
1644 | Cond := Check; | |
1645 | else | |
1646 | Cond := | |
1647 | Make_And_Then (Loc, | |
1648 | Left_Opnd => Cond, | |
1649 | Right_Opnd => Check); | |
1650 | end if; | |
1651 | end loop; | |
1652 | ||
1653 | Build_Conditional_Block (Loc, | |
1654 | Cond => Cond, | |
1655 | Loop_Stmt => Relocate_Node (Loop_Stmt), | |
1656 | If_Stmt => Result, | |
1657 | Blk_Stmt => Blk); | |
1658 | end; | |
1659 | ||
1660 | -- For loops are transformed into: | |
1661 | ||
1662 | -- if <Low> <= <High> then | |
1663 | -- declare | |
1664 | -- Temp1 : constant <type of Pref1> := <Pref1>; | |
1665 | -- . . . | |
1666 | -- TempN : constant <type of PrefN> := <PrefN>; | |
1667 | -- begin | |
1668 | -- for <Def_Id> in <Low> .. <High> loop | |
1669 | -- <original source statements with attribute rewrites> | |
1670 | -- end loop; | |
1671 | -- end; | |
1672 | -- end if; | |
1673 | ||
1674 | elsif Present (Loop_Parameter_Specification (Scheme)) then | |
1675 | declare | |
1676 | Loop_Spec : constant Node_Id := | |
1677 | Loop_Parameter_Specification (Scheme); | |
1678 | Cond : Node_Id; | |
1679 | Subt_Def : Node_Id; | |
1680 | ||
1681 | begin | |
1682 | Subt_Def := Discrete_Subtype_Definition (Loop_Spec); | |
1683 | ||
1684 | -- When the loop iterates over a subtype indication with a | |
1685 | -- range, use the low and high bounds of the subtype itself. | |
1686 | ||
1687 | if Nkind (Subt_Def) = N_Subtype_Indication then | |
1688 | Subt_Def := Scalar_Range (Etype (Subt_Def)); | |
1689 | end if; | |
1690 | ||
1691 | pragma Assert (Nkind (Subt_Def) = N_Range); | |
1692 | ||
1693 | -- Generate | |
1694 | -- Low <= High | |
1695 | ||
1696 | Cond := | |
1697 | Make_Op_Le (Loc, | |
1698 | Left_Opnd => New_Copy_Tree (Low_Bound (Subt_Def)), | |
1699 | Right_Opnd => New_Copy_Tree (High_Bound (Subt_Def))); | |
1700 | ||
1701 | Build_Conditional_Block (Loc, | |
1702 | Cond => Cond, | |
1703 | Loop_Stmt => Relocate_Node (Loop_Stmt), | |
1704 | If_Stmt => Result, | |
1705 | Blk_Stmt => Blk); | |
1706 | end; | |
d436b30d AC |
1707 | end if; |
1708 | ||
1709 | Decls := Declarations (Blk); | |
1710 | end if; | |
1711 | ||
1712 | -- Step 3: Create a constant to capture the value of the prefix at the | |
1713 | -- entry point into the loop. | |
1714 | ||
d436b30d AC |
1715 | Temp_Id := Make_Temporary (Loc, 'P'); |
1716 | ||
6c802906 AC |
1717 | -- Preserve the tag of the prefix by offering a specific view of the |
1718 | -- class-wide version of the prefix. | |
1719 | ||
0f83b044 AC |
1720 | if Is_Tagged_Type (Base_Typ) then |
1721 | Tagged_Case : declare | |
1722 | CW_Temp : Entity_Id; | |
1723 | CW_Typ : Entity_Id; | |
1724 | ||
1725 | begin | |
1726 | -- Generate: | |
1727 | -- CW_Temp : constant Base_Typ'Class := Base_Typ'Class (Pref); | |
1728 | ||
1729 | CW_Temp := Make_Temporary (Loc, 'T'); | |
1730 | CW_Typ := Class_Wide_Type (Base_Typ); | |
1731 | ||
1732 | Aux_Decl := | |
1733 | Make_Object_Declaration (Loc, | |
1734 | Defining_Identifier => CW_Temp, | |
1735 | Constant_Present => True, | |
1736 | Object_Definition => New_Occurrence_Of (CW_Typ, Loc), | |
1737 | Expression => | |
1738 | Convert_To (CW_Typ, Relocate_Node (Pref))); | |
1739 | Append_To (Decls, Aux_Decl); | |
1740 | ||
1741 | -- Generate: | |
1742 | -- Temp : Base_Typ renames Base_Typ (CW_Temp); | |
1743 | ||
1744 | Temp_Decl := | |
1745 | Make_Object_Renaming_Declaration (Loc, | |
1746 | Defining_Identifier => Temp_Id, | |
1747 | Subtype_Mark => New_Occurrence_Of (Base_Typ, Loc), | |
1748 | Name => | |
1749 | Convert_To (Base_Typ, New_Occurrence_Of (CW_Temp, Loc))); | |
1750 | Append_To (Decls, Temp_Decl); | |
1751 | end Tagged_Case; | |
1752 | ||
1753 | -- Untagged case | |
6c802906 AC |
1754 | |
1755 | else | |
0f83b044 AC |
1756 | Untagged_Case : declare |
1757 | Temp_Expr : Node_Id; | |
1758 | ||
1759 | begin | |
1760 | Aux_Decl := Empty; | |
1761 | ||
1762 | -- Generate a nominal type for the constant when the prefix is of | |
1763 | -- a constrained type. This is achieved by setting the Etype of | |
1764 | -- the relocated prefix to its base type. Since the prefix is now | |
1765 | -- the initialization expression of the constant, its freezing | |
1766 | -- will produce a proper nominal type. | |
1767 | ||
1768 | Temp_Expr := Relocate_Node (Pref); | |
1769 | Set_Etype (Temp_Expr, Base_Typ); | |
1770 | ||
1771 | -- Generate: | |
1772 | -- Temp : constant Base_Typ := Pref; | |
1773 | ||
1774 | Temp_Decl := | |
1775 | Make_Object_Declaration (Loc, | |
1776 | Defining_Identifier => Temp_Id, | |
1777 | Constant_Present => True, | |
1778 | Object_Definition => New_Occurrence_Of (Base_Typ, Loc), | |
1779 | Expression => Temp_Expr); | |
1780 | Append_To (Decls, Temp_Decl); | |
1781 | end Untagged_Case; | |
6c802906 | 1782 | end if; |
d436b30d AC |
1783 | |
1784 | -- Step 4: Analyze all bits | |
1785 | ||
3d67b239 | 1786 | Installed := Current_Scope = Scope (Loop_Id); |
d436b30d | 1787 | |
327b1ba4 AC |
1788 | -- Depending on the pracement of attribute 'Loop_Entry relative to the |
1789 | -- associated loop, ensure the proper visibility for analysis. | |
1790 | ||
d436b30d AC |
1791 | if not Installed then |
1792 | Push_Scope (Scope (Loop_Id)); | |
1793 | end if; | |
1794 | ||
327b1ba4 AC |
1795 | -- The analysis of the conditional block takes care of the constant |
1796 | -- declaration. | |
1797 | ||
d436b30d AC |
1798 | if Present (Result) then |
1799 | Rewrite (Loop_Stmt, Result); | |
1800 | Analyze (Loop_Stmt); | |
327b1ba4 AC |
1801 | |
1802 | -- The conditional block was analyzed when a previous 'Loop_Entry was | |
1803 | -- expanded. There is no point in reanalyzing the block, simply analyze | |
1804 | -- the declaration of the constant. | |
1805 | ||
d436b30d | 1806 | else |
0f83b044 AC |
1807 | if Present (Aux_Decl) then |
1808 | Analyze (Aux_Decl); | |
6c802906 AC |
1809 | end if; |
1810 | ||
d436b30d AC |
1811 | Analyze (Temp_Decl); |
1812 | end if; | |
1813 | ||
fd7215d7 | 1814 | Rewrite (N, New_Occurrence_Of (Temp_Id, Loc)); |
aa9b151a | 1815 | Analyze (N); |
d436b30d | 1816 | |
d436b30d AC |
1817 | if not Installed then |
1818 | Pop_Scope; | |
1819 | end if; | |
1820 | end Expand_Loop_Entry_Attribute; | |
1821 | ||
e0f63680 AC |
1822 | ------------------------------ |
1823 | -- Expand_Min_Max_Attribute -- | |
1824 | ------------------------------ | |
1825 | ||
1826 | procedure Expand_Min_Max_Attribute (N : Node_Id) is | |
1827 | begin | |
1828 | -- Min and Max are handled by the back end (except that static cases | |
1829 | -- have already been evaluated during semantic processing, although the | |
1830 | -- back end should not count on this). The one bit of special processing | |
1831 | -- required in the normal case is that these two attributes typically | |
1832 | -- generate conditionals in the code, so check the relevant restriction. | |
1833 | ||
1834 | Check_Restriction (No_Implicit_Conditionals, N); | |
e0f63680 AC |
1835 | end Expand_Min_Max_Attribute; |
1836 | ||
70482933 RK |
1837 | ---------------------------------- |
1838 | -- Expand_N_Attribute_Reference -- | |
1839 | ---------------------------------- | |
1840 | ||
1841 | procedure Expand_N_Attribute_Reference (N : Node_Id) is | |
23a9215f PT |
1842 | Loc : constant Source_Ptr := Sloc (N); |
1843 | Pref : constant Node_Id := Prefix (N); | |
1844 | Exprs : constant List_Id := Expressions (N); | |
70482933 | 1845 | |
f193b29e EB |
1846 | function Get_Integer_Type (Typ : Entity_Id) return Entity_Id; |
1847 | -- Return a small integer type appropriate for the enumeration type | |
1848 | ||
110d0820 BD |
1849 | procedure Rewrite_Attribute_Proc_Call (Pname : Entity_Id); |
1850 | -- Rewrites an attribute for Read, Write, Output, or Put_Image with a | |
1851 | -- call to the appropriate TSS procedure. Pname is the entity for the | |
1852 | -- procedure to call. | |
70482933 | 1853 | |
f193b29e EB |
1854 | ---------------------- |
1855 | -- Get_Integer_Type -- | |
1856 | ---------------------- | |
1857 | ||
1858 | function Get_Integer_Type (Typ : Entity_Id) return Entity_Id is | |
cdf4576b | 1859 | Siz : constant Uint := Esize (Base_Type (Typ)); |
f193b29e EB |
1860 | |
1861 | begin | |
25a11453 | 1862 | -- We need to accommodate invalid values of the base type since we |
cdf4576b | 1863 | -- accept them for Enum_Rep and Pos, so we reason on the Esize. |
f193b29e | 1864 | |
cdf4576b | 1865 | return Small_Integer_Type_For (Siz, Uns => Is_Unsigned_Type (Typ)); |
f193b29e EB |
1866 | end Get_Integer_Type; |
1867 | ||
110d0820 BD |
1868 | --------------------------------- |
1869 | -- Rewrite_Attribute_Proc_Call -- | |
1870 | --------------------------------- | |
70482933 | 1871 | |
110d0820 | 1872 | procedure Rewrite_Attribute_Proc_Call (Pname : Entity_Id) is |
70482933 | 1873 | Item : constant Node_Id := Next (First (Exprs)); |
ed3fe8cc | 1874 | Item_Typ : constant Entity_Id := Etype (Item); |
fbf5a39b AC |
1875 | Formal : constant Entity_Id := Next_Formal (First_Formal (Pname)); |
1876 | Formal_Typ : constant Entity_Id := Etype (Formal); | |
ed3fe8cc | 1877 | Is_Written : constant Boolean := Ekind (Formal) /= E_In_Parameter; |
70482933 RK |
1878 | |
1879 | begin | |
fbf5a39b AC |
1880 | -- The expansion depends on Item, the second actual, which is |
1881 | -- the object being streamed in or out. | |
1882 | ||
1883 | -- If the item is a component of a packed array type, and | |
1884 | -- a conversion is needed on exit, we introduce a temporary to | |
1885 | -- hold the value, because otherwise the packed reference will | |
1886 | -- not be properly expanded. | |
1887 | ||
1888 | if Nkind (Item) = N_Indexed_Component | |
1889 | and then Is_Packed (Base_Type (Etype (Prefix (Item)))) | |
ed3fe8cc | 1890 | and then Base_Type (Item_Typ) /= Base_Type (Formal_Typ) |
fbf5a39b AC |
1891 | and then Is_Written |
1892 | then | |
1893 | declare | |
191fcb3a | 1894 | Temp : constant Entity_Id := Make_Temporary (Loc, 'V'); |
fbf5a39b AC |
1895 | Decl : Node_Id; |
1896 | Assn : Node_Id; | |
1897 | ||
1898 | begin | |
1899 | Decl := | |
1900 | Make_Object_Declaration (Loc, | |
1901 | Defining_Identifier => Temp, | |
ed3fe8cc | 1902 | Object_Definition => New_Occurrence_Of (Formal_Typ, Loc)); |
fbf5a39b AC |
1903 | Set_Etype (Temp, Formal_Typ); |
1904 | ||
1905 | Assn := | |
1906 | Make_Assignment_Statement (Loc, | |
ed3fe8cc | 1907 | Name => New_Copy_Tree (Item), |
fbf5a39b AC |
1908 | Expression => |
1909 | Unchecked_Convert_To | |
ed3fe8cc | 1910 | (Item_Typ, New_Occurrence_Of (Temp, Loc))); |
fbf5a39b AC |
1911 | |
1912 | Rewrite (Item, New_Occurrence_Of (Temp, Loc)); | |
1913 | Insert_Actions (N, | |
1914 | New_List ( | |
1915 | Decl, | |
1916 | Make_Procedure_Call_Statement (Loc, | |
ed3fe8cc | 1917 | Name => New_Occurrence_Of (Pname, Loc), |
fbf5a39b AC |
1918 | Parameter_Associations => Exprs), |
1919 | Assn)); | |
1920 | ||
1921 | Rewrite (N, Make_Null_Statement (Loc)); | |
1922 | return; | |
1923 | end; | |
1924 | end if; | |
70482933 RK |
1925 | |
1926 | -- For the class-wide dispatching cases, and for cases in which | |
1927 | -- the base type of the second argument matches the base type of | |
fbf5a39b AC |
1928 | -- the corresponding formal parameter (that is to say the stream |
1929 | -- operation is not inherited), we are all set, and can use the | |
1930 | -- argument unchanged. | |
70482933 | 1931 | |
70482933 | 1932 | if not Is_Class_Wide_Type (Entity (Pref)) |
fbf5a39b | 1933 | and then not Is_Class_Wide_Type (Etype (Item)) |
ed3fe8cc | 1934 | and then Base_Type (Item_Typ) /= Base_Type (Formal_Typ) |
70482933 | 1935 | then |
ed3fe8cc AC |
1936 | -- Perform a view conversion when either the argument or the |
1937 | -- formal parameter are of a private type. | |
1938 | ||
b5360737 AC |
1939 | if Is_Private_Type (Base_Type (Formal_Typ)) |
1940 | or else Is_Private_Type (Base_Type (Item_Typ)) | |
ed3fe8cc AC |
1941 | then |
1942 | Rewrite (Item, | |
1943 | Unchecked_Convert_To (Formal_Typ, Relocate_Node (Item))); | |
1944 | ||
1945 | -- Otherwise perform a regular type conversion to ensure that all | |
1946 | -- relevant checks are installed. | |
1947 | ||
1948 | else | |
1949 | Rewrite (Item, Convert_To (Formal_Typ, Relocate_Node (Item))); | |
1950 | end if; | |
70482933 RK |
1951 | |
1952 | -- For untagged derived types set Assignment_OK, to prevent | |
1953 | -- copies from being created when the unchecked conversion | |
1954 | -- is expanded (which would happen in Remove_Side_Effects | |
1955 | -- if Expand_N_Unchecked_Conversion were allowed to call | |
365c8496 RD |
1956 | -- Force_Evaluation). The copy could violate Ada semantics in |
1957 | -- cases such as an actual that is an out parameter. Note that | |
1958 | -- this approach is also used in exp_ch7 for calls to controlled | |
1959 | -- type operations to prevent problems with actuals wrapped in | |
1960 | -- unchecked conversions. | |
70482933 RK |
1961 | |
1962 | if Is_Untagged_Derivation (Etype (Expression (Item))) then | |
1963 | Set_Assignment_OK (Item); | |
1964 | end if; | |
1965 | end if; | |
1966 | ||
110d0820 BD |
1967 | -- The stream operation to call might be a renaming created by an |
1968 | -- attribute definition clause, and might not be frozen yet. Ensure | |
365c8496 | 1969 | -- that it has the necessary extra formals. |
99269cf5 ES |
1970 | |
1971 | if not Is_Frozen (Pname) then | |
1972 | Create_Extra_Formals (Pname); | |
1973 | end if; | |
1974 | ||
70482933 RK |
1975 | -- And now rewrite the call |
1976 | ||
1977 | Rewrite (N, | |
1978 | Make_Procedure_Call_Statement (Loc, | |
ed3fe8cc | 1979 | Name => New_Occurrence_Of (Pname, Loc), |
70482933 RK |
1980 | Parameter_Associations => Exprs)); |
1981 | ||
1982 | Analyze (N); | |
110d0820 BD |
1983 | end Rewrite_Attribute_Proc_Call; |
1984 | ||
23a9215f PT |
1985 | Typ : constant Entity_Id := Etype (N); |
1986 | Btyp : constant Entity_Id := Base_Type (Typ); | |
1987 | Ptyp : constant Entity_Id := Etype (Pref); | |
1988 | Id : constant Attribute_Id := Get_Attribute_Id (Attribute_Name (N)); | |
70482933 RK |
1989 | |
1990 | -- Start of processing for Expand_N_Attribute_Reference | |
1991 | ||
1992 | begin | |
82c80734 RD |
1993 | -- Do required validity checking, if enabled. Do not apply check to |
1994 | -- output parameters of an Asm instruction, since the value of this | |
1dcdbfab AC |
1995 | -- is not set till after the attribute has been elaborated, and do |
1996 | -- not apply the check to the arguments of a 'Read or 'Input attribute | |
1997 | -- reference since the scalar argument is an OUT scalar. | |
70482933 | 1998 | |
82c80734 RD |
1999 | if Validity_Checks_On and then Validity_Check_Operands |
2000 | and then Id /= Attribute_Asm_Output | |
1dcdbfab AC |
2001 | and then Id /= Attribute_Read |
2002 | and then Id /= Attribute_Input | |
82c80734 | 2003 | then |
70482933 RK |
2004 | declare |
2005 | Expr : Node_Id; | |
70482933 RK |
2006 | begin |
2007 | Expr := First (Expressions (N)); | |
2008 | while Present (Expr) loop | |
2009 | Ensure_Valid (Expr); | |
2010 | Next (Expr); | |
2011 | end loop; | |
2012 | end; | |
2013 | end if; | |
2014 | ||
21d27997 RD |
2015 | -- Ada 2005 (AI-318-02): If attribute prefix is a call to a build-in- |
2016 | -- place function, then a temporary return object needs to be created | |
d4dfb005 | 2017 | -- and access to it must be passed to the function. |
21d27997 | 2018 | |
d4dfb005 | 2019 | if Is_Build_In_Place_Function_Call (Pref) then |
fb9dd1c7 PMR |
2020 | |
2021 | -- If attribute is 'Old, the context is a postcondition, and | |
2022 | -- the temporary must go in the corresponding subprogram, not | |
2023 | -- the postcondition function or any created blocks, as when | |
2024 | -- the attribute appears in a quantified expression. This is | |
2025 | -- handled below in the expansion of the attribute. | |
2026 | ||
2027 | if Attribute_Name (Parent (Pref)) = Name_Old then | |
2028 | null; | |
fb9dd1c7 PMR |
2029 | else |
2030 | Make_Build_In_Place_Call_In_Anonymous_Context (Pref); | |
2031 | end if; | |
4ac62786 AC |
2032 | |
2033 | -- Ada 2005 (AI-318-02): Specialization of the previous case for prefix | |
2034 | -- containing build-in-place function calls whose returned object covers | |
2035 | -- interface types. | |
2036 | ||
d4dfb005 | 2037 | elsif Present (Unqual_BIP_Iface_Function_Call (Pref)) then |
4ac62786 | 2038 | Make_Build_In_Place_Iface_Call_In_Anonymous_Context (Pref); |
21d27997 RD |
2039 | end if; |
2040 | ||
5f3f175d AC |
2041 | -- If prefix is a protected type name, this is a reference to the |
2042 | -- current instance of the type. For a component definition, nothing | |
2043 | -- to do (expansion will occur in the init proc). In other contexts, | |
2044 | -- rewrite into reference to current instance. | |
2045 | ||
2046 | if Is_Protected_Self_Reference (Pref) | |
1e4b91fc | 2047 | and then not |
4a08c95c AC |
2048 | (Nkind (Parent (N)) in N_Index_Or_Discriminant_Constraint |
2049 | | N_Discriminant_Association | |
8926d369 | 2050 | and then Nkind (Parent (Parent (Parent (Parent (N))))) = |
69ba91ed | 2051 | N_Component_Definition) |
1e4b91fc AC |
2052 | |
2053 | -- No action needed for these attributes since the current instance | |
2054 | -- will be rewritten to be the name of the _object parameter | |
2055 | -- associated with the enclosing protected subprogram (see below). | |
2056 | ||
2057 | and then Id /= Attribute_Access | |
2058 | and then Id /= Attribute_Unchecked_Access | |
2059 | and then Id /= Attribute_Unrestricted_Access | |
5f3f175d | 2060 | then |
2d14501c ST |
2061 | Rewrite (Pref, Concurrent_Ref (Pref)); |
2062 | Analyze (Pref); | |
2063 | end if; | |
2064 | ||
70482933 RK |
2065 | -- Remaining processing depends on specific attribute |
2066 | ||
2eef7403 AC |
2067 | -- Note: individual sections of the following case statement are |
2068 | -- allowed to assume there is no code after the case statement, and | |
2069 | -- are legitimately allowed to execute return statements if they have | |
2070 | -- nothing more to do. | |
2071 | ||
70482933 RK |
2072 | case Id is |
2073 | ||
82d4f390 | 2074 | -- Attributes related to Ada 2012 iterators |
0da80d7d | 2075 | |
d8f43ee6 HK |
2076 | when Attribute_Constant_Indexing |
2077 | | Attribute_Default_Iterator | |
2078 | | Attribute_Implicit_Dereference | |
2079 | | Attribute_Iterable | |
2080 | | Attribute_Iterator_Element | |
2081 | | Attribute_Variable_Indexing | |
2082 | => | |
d48f3dca | 2083 | null; |
b98e2969 | 2084 | |
d27f3ff4 AC |
2085 | -- Internal attributes used to deal with Ada 2012 delayed aspects. These |
2086 | -- were already rejected by the parser. Thus they shouldn't appear here. | |
b98e2969 | 2087 | |
c1107fa3 | 2088 | when Internal_Attribute_Id => |
d48f3dca | 2089 | raise Program_Error; |
0da80d7d | 2090 | |
70482933 RK |
2091 | ------------ |
2092 | -- Access -- | |
2093 | ------------ | |
2094 | ||
d8f43ee6 HK |
2095 | when Attribute_Access |
2096 | | Attribute_Unchecked_Access | |
2097 | | Attribute_Unrestricted_Access | |
2098 | => | |
3192631e | 2099 | Access_Cases : declare |
3192631e | 2100 | Ref_Object : constant Node_Id := Get_Referenced_Object (Pref); |
0d4aed99 | 2101 | Btyp_DDT : Entity_Id; |
70482933 | 2102 | |
01aef5ad GD |
2103 | function Enclosing_Object (N : Node_Id) return Node_Id; |
2104 | -- If N denotes a compound name (selected component, indexed | |
69ba91ed AC |
2105 | -- component, or slice), returns the name of the outermost such |
2106 | -- enclosing object. Otherwise returns N. If the object is a | |
2107 | -- renaming, then the renamed object is returned. | |
01aef5ad GD |
2108 | |
2109 | ---------------------- | |
2110 | -- Enclosing_Object -- | |
2111 | ---------------------- | |
2112 | ||
2113 | function Enclosing_Object (N : Node_Id) return Node_Id is | |
2114 | Obj_Name : Node_Id; | |
2115 | ||
2116 | begin | |
2117 | Obj_Name := N; | |
4a08c95c AC |
2118 | while Nkind (Obj_Name) in N_Selected_Component |
2119 | | N_Indexed_Component | |
2120 | | N_Slice | |
01aef5ad GD |
2121 | loop |
2122 | Obj_Name := Prefix (Obj_Name); | |
2123 | end loop; | |
2124 | ||
2125 | return Get_Referenced_Object (Obj_Name); | |
2126 | end Enclosing_Object; | |
2127 | ||
2128 | -- Local declarations | |
2129 | ||
2130 | Enc_Object : constant Node_Id := Enclosing_Object (Ref_Object); | |
2131 | ||
2132 | -- Start of processing for Access_Cases | |
2133 | ||
3192631e | 2134 | begin |
0d4aed99 AC |
2135 | Btyp_DDT := Designated_Type (Btyp); |
2136 | ||
2137 | -- Handle designated types that come from the limited view | |
2138 | ||
47346923 AC |
2139 | if From_Limited_With (Btyp_DDT) |
2140 | and then Has_Non_Limited_View (Btyp_DDT) | |
0d4aed99 AC |
2141 | then |
2142 | Btyp_DDT := Non_Limited_View (Btyp_DDT); | |
0d4aed99 AC |
2143 | end if; |
2144 | ||
e10dab7f JM |
2145 | -- In order to improve the text of error messages, the designated |
2146 | -- type of access-to-subprogram itypes is set by the semantics as | |
2147 | -- the associated subprogram entity (see sem_attr). Now we replace | |
2148 | -- such node with the proper E_Subprogram_Type itype. | |
2149 | ||
2150 | if Id = Attribute_Unrestricted_Access | |
2151 | and then Is_Subprogram (Directly_Designated_Type (Typ)) | |
2152 | then | |
21d27997 | 2153 | -- The following conditions ensure that this special management |
e10dab7f JM |
2154 | -- is done only for "Address!(Prim'Unrestricted_Access)" nodes. |
2155 | -- At this stage other cases in which the designated type is | |
2156 | -- still a subprogram (instead of an E_Subprogram_Type) are | |
e14c931f | 2157 | -- wrong because the semantics must have overridden the type of |
e10dab7f JM |
2158 | -- the node with the type imposed by the context. |
2159 | ||
21d27997 | 2160 | if Nkind (Parent (N)) = N_Unchecked_Type_Conversion |
3477e0b2 | 2161 | and then Is_RTE (Etype (Parent (N)), RE_Prim_Ptr) |
21d27997 RD |
2162 | then |
2163 | Set_Etype (N, RTE (RE_Prim_Ptr)); | |
e10dab7f | 2164 | |
21d27997 RD |
2165 | else |
2166 | declare | |
2167 | Subp : constant Entity_Id := | |
2168 | Directly_Designated_Type (Typ); | |
2169 | Etyp : Entity_Id; | |
2170 | Extra : Entity_Id := Empty; | |
2171 | New_Formal : Entity_Id; | |
2172 | Old_Formal : Entity_Id := First_Formal (Subp); | |
2173 | Subp_Typ : Entity_Id; | |
e10dab7f | 2174 | |
21d27997 RD |
2175 | begin |
2176 | Subp_Typ := Create_Itype (E_Subprogram_Type, N); | |
d235950e | 2177 | Copy_Strub_Mode (Subp_Typ, Subp); |
21d27997 RD |
2178 | Set_Etype (Subp_Typ, Etype (Subp)); |
2179 | Set_Returns_By_Ref (Subp_Typ, Returns_By_Ref (Subp)); | |
e10dab7f | 2180 | |
21d27997 RD |
2181 | if Present (Old_Formal) then |
2182 | New_Formal := New_Copy (Old_Formal); | |
2183 | Set_First_Entity (Subp_Typ, New_Formal); | |
e10dab7f | 2184 | |
21d27997 RD |
2185 | loop |
2186 | Set_Scope (New_Formal, Subp_Typ); | |
2187 | Etyp := Etype (New_Formal); | |
e10dab7f | 2188 | |
21d27997 RD |
2189 | -- Handle itypes. There is no need to duplicate |
2190 | -- here the itypes associated with record types | |
2191 | -- (i.e the implicit full view of private types). | |
e10dab7f | 2192 | |
21d27997 RD |
2193 | if Is_Itype (Etyp) |
2194 | and then Ekind (Base_Type (Etyp)) /= E_Record_Type | |
e10dab7f | 2195 | then |
21d27997 RD |
2196 | Extra := New_Copy (Etyp); |
2197 | Set_Parent (Extra, New_Formal); | |
2198 | Set_Etype (New_Formal, Extra); | |
2199 | Set_Scope (Extra, Subp_Typ); | |
e10dab7f JM |
2200 | end if; |
2201 | ||
21d27997 RD |
2202 | Extra := New_Formal; |
2203 | Next_Formal (Old_Formal); | |
2204 | exit when No (Old_Formal); | |
e10dab7f | 2205 | |
3f6d1daa JS |
2206 | Link_Entities (New_Formal, New_Copy (Old_Formal)); |
2207 | Next_Entity (New_Formal); | |
21d27997 | 2208 | end loop; |
e10dab7f | 2209 | |
3f6d1daa | 2210 | Unlink_Next_Entity (New_Formal); |
21d27997 RD |
2211 | Set_Last_Entity (Subp_Typ, Extra); |
2212 | end if; | |
e10dab7f | 2213 | |
21d27997 RD |
2214 | -- Now that the explicit formals have been duplicated, |
2215 | -- any extra formals needed by the subprogram must be | |
2216 | -- created. | |
e10dab7f | 2217 | |
21d27997 RD |
2218 | if Present (Extra) then |
2219 | Set_Extra_Formal (Extra, Empty); | |
2220 | end if; | |
e10dab7f | 2221 | |
21d27997 RD |
2222 | Create_Extra_Formals (Subp_Typ); |
2223 | Set_Directly_Designated_Type (Typ, Subp_Typ); | |
2224 | end; | |
2225 | end if; | |
e10dab7f JM |
2226 | end if; |
2227 | ||
3192631e JM |
2228 | if Is_Access_Protected_Subprogram_Type (Btyp) then |
2229 | Expand_Access_To_Protected_Op (N, Pref, Typ); | |
2230 | ||
475e1d24 JM |
2231 | -- If prefix is a subprogram that has class-wide preconditions and |
2232 | -- an indirect-call wrapper (ICW) of such subprogram is available | |
2233 | -- then replace the prefix by the ICW. | |
2234 | ||
2235 | elsif Is_Access_Subprogram_Type (Btyp) | |
2236 | and then Is_Entity_Name (Pref) | |
2237 | and then Present (Class_Preconditions (Entity (Pref))) | |
2238 | and then Present (Indirect_Call_Wrapper (Entity (Pref))) | |
2239 | then | |
2240 | Rewrite (Pref, | |
2241 | New_Occurrence_Of | |
2242 | (Indirect_Call_Wrapper (Entity (Pref)), Loc)); | |
2243 | Analyze_And_Resolve (N, Typ); | |
2244 | ||
3192631e JM |
2245 | -- If prefix is a type name, this is a reference to the current |
2246 | -- instance of the type, within its initialization procedure. | |
2247 | ||
2248 | elsif Is_Entity_Name (Pref) | |
2249 | and then Is_Type (Entity (Pref)) | |
2250 | then | |
2251 | declare | |
2252 | Par : Node_Id; | |
2253 | Formal : Entity_Id; | |
2254 | ||
2255 | begin | |
2256 | -- If the current instance name denotes a task type, then | |
2257 | -- the access attribute is rewritten to be the name of the | |
2258 | -- "_task" parameter associated with the task type's task | |
2259 | -- procedure. An unchecked conversion is applied to ensure | |
2260 | -- a type match in cases of expander-generated calls (e.g. | |
2261 | -- init procs). | |
2262 | ||
2263 | if Is_Task_Type (Entity (Pref)) then | |
2264 | Formal := | |
2265 | First_Entity (Get_Task_Body_Procedure (Entity (Pref))); | |
2266 | while Present (Formal) loop | |
2267 | exit when Chars (Formal) = Name_uTask; | |
2268 | Next_Entity (Formal); | |
2269 | end loop; | |
2270 | ||
2271 | pragma Assert (Present (Formal)); | |
3e8ee849 | 2272 | |
3192631e JM |
2273 | Rewrite (N, |
2274 | Unchecked_Convert_To (Typ, | |
2275 | New_Occurrence_Of (Formal, Loc))); | |
2276 | Set_Etype (N, Typ); | |
3e8ee849 | 2277 | |
1e4b91fc AC |
2278 | elsif Is_Protected_Type (Entity (Pref)) then |
2279 | ||
2280 | -- No action needed for current instance located in a | |
2281 | -- component definition (expansion will occur in the | |
2282 | -- init proc) | |
2283 | ||
2284 | if Is_Protected_Type (Current_Scope) then | |
2285 | null; | |
2286 | ||
2287 | -- If the current instance reference is located in a | |
2288 | -- protected subprogram or entry then rewrite the access | |
2289 | -- attribute to be the name of the "_object" parameter. | |
2290 | -- An unchecked conversion is applied to ensure a type | |
2291 | -- match in cases of expander-generated calls (e.g. init | |
2292 | -- procs). | |
2293 | ||
289a994b AC |
2294 | -- The code may be nested in a block, so find enclosing |
2295 | -- scope that is a protected operation. | |
2296 | ||
1e4b91fc | 2297 | else |
289a994b AC |
2298 | declare |
2299 | Subp : Entity_Id; | |
2300 | ||
2301 | begin | |
2302 | Subp := Current_Scope; | |
4a08c95c | 2303 | while Ekind (Subp) in E_Loop | E_Block loop |
289a994b AC |
2304 | Subp := Scope (Subp); |
2305 | end loop; | |
2306 | ||
2307 | Formal := | |
2308 | First_Entity | |
2309 | (Protected_Body_Subprogram (Subp)); | |
2310 | ||
2311 | -- For a protected subprogram the _Object parameter | |
2312 | -- is the protected record, so we create an access | |
2313 | -- to it. The _Object parameter of an entry is an | |
2314 | -- address. | |
2315 | ||
2316 | if Ekind (Subp) = E_Entry then | |
2317 | Rewrite (N, | |
2318 | Unchecked_Convert_To (Typ, | |
2319 | New_Occurrence_Of (Formal, Loc))); | |
2320 | Set_Etype (N, Typ); | |
2321 | ||
2322 | else | |
2323 | Rewrite (N, | |
2324 | Unchecked_Convert_To (Typ, | |
2325 | Make_Attribute_Reference (Loc, | |
2326 | Attribute_Name => Name_Unrestricted_Access, | |
59fad002 AC |
2327 | Prefix => |
2328 | New_Occurrence_Of (Formal, Loc)))); | |
289a994b AC |
2329 | Analyze_And_Resolve (N); |
2330 | end if; | |
2331 | end; | |
1e4b91fc AC |
2332 | end if; |
2333 | ||
2334 | -- The expression must appear in a default expression, | |
2335 | -- (which in the initialization procedure is the right-hand | |
2336 | -- side of an assignment), and not in a discriminant | |
2337 | -- constraint. | |
3e8ee849 | 2338 | |
3192631e JM |
2339 | else |
2340 | Par := Parent (N); | |
2341 | while Present (Par) loop | |
2342 | exit when Nkind (Par) = N_Assignment_Statement; | |
3e8ee849 | 2343 | |
3192631e JM |
2344 | if Nkind (Par) = N_Component_Declaration then |
2345 | return; | |
2346 | end if; | |
3e8ee849 | 2347 | |
3192631e JM |
2348 | Par := Parent (Par); |
2349 | end loop; | |
3e8ee849 | 2350 | |
3192631e JM |
2351 | if Present (Par) then |
2352 | Rewrite (N, | |
2353 | Make_Attribute_Reference (Loc, | |
2354 | Prefix => Make_Identifier (Loc, Name_uInit), | |
2355 | Attribute_Name => Attribute_Name (N))); | |
3e8ee849 | 2356 | |
3192631e JM |
2357 | Analyze_And_Resolve (N, Typ); |
2358 | end if; | |
3e8ee849 | 2359 | end if; |
3192631e JM |
2360 | end; |
2361 | ||
2362 | -- If the prefix of an Access attribute is a dereference of an | |
01aef5ad GD |
2363 | -- access parameter (or a renaming of such a dereference, or a |
2364 | -- subcomponent of such a dereference) and the context is a | |
ae8c7d87 RD |
2365 | -- general access type (including the type of an object or |
2366 | -- component with an access_definition, but not the anonymous | |
2367 | -- type of an access parameter or access discriminant), then | |
01aef5ad GD |
2368 | -- apply an accessibility check to the access parameter. We used |
2369 | -- to rewrite the access parameter as a type conversion, but that | |
2370 | -- could only be done if the immediate prefix of the Access | |
2371 | -- attribute was the dereference, and didn't handle cases where | |
2372 | -- the attribute is applied to a subcomponent of the dereference, | |
2373 | -- since there's generally no available, appropriate access type | |
e84e11ba GD |
2374 | -- to convert to in that case. The attribute is passed as the |
2375 | -- point to insert the check, because the access parameter may | |
2376 | -- come from a renaming, possibly in a different scope, and the | |
2377 | -- check must be associated with the attribute itself. | |
01aef5ad GD |
2378 | |
2379 | elsif Id = Attribute_Access | |
2380 | and then Nkind (Enc_Object) = N_Explicit_Dereference | |
2381 | and then Is_Entity_Name (Prefix (Enc_Object)) | |
ae8c7d87 RD |
2382 | and then (Ekind (Btyp) = E_General_Access_Type |
2383 | or else Is_Local_Anonymous_Access (Btyp)) | |
b21732c5 | 2384 | and then Is_Formal (Entity (Prefix (Enc_Object))) |
01aef5ad | 2385 | and then Ekind (Etype (Entity (Prefix (Enc_Object)))) |
3192631e JM |
2386 | = E_Anonymous_Access_Type |
2387 | and then Present (Extra_Accessibility | |
01aef5ad | 2388 | (Entity (Prefix (Enc_Object)))) |
bcb8c3bb | 2389 | and then not No_Dynamic_Accessibility_Checks_Enabled (Enc_Object) |
3192631e | 2390 | then |
e84e11ba | 2391 | Apply_Accessibility_Check (Prefix (Enc_Object), Typ, N); |
3192631e JM |
2392 | |
2393 | -- Ada 2005 (AI-251): If the designated type is an interface we | |
2394 | -- add an implicit conversion to force the displacement of the | |
2395 | -- pointer to reference the secondary dispatch table. | |
2396 | ||
2397 | elsif Is_Interface (Btyp_DDT) | |
2398 | and then (Comes_From_Source (N) | |
2399 | or else Comes_From_Source (Ref_Object) | |
2400 | or else (Nkind (Ref_Object) in N_Has_Chars | |
2401 | and then Chars (Ref_Object) = Name_uInit)) | |
2402 | then | |
2403 | if Nkind (Ref_Object) /= N_Explicit_Dereference then | |
2404 | ||
bea993f9 AC |
2405 | -- No implicit conversion required if types match, or if |
2406 | -- the prefix is the class_wide_type of the interface. In | |
2407 | -- either case passing an object of the interface type has | |
2408 | -- already set the pointer correctly. | |
2409 | ||
2410 | if Btyp_DDT = Etype (Ref_Object) | |
2411 | or else (Is_Class_Wide_Type (Etype (Ref_Object)) | |
2412 | and then | |
2413 | Class_Wide_Type (Btyp_DDT) = Etype (Ref_Object)) | |
2414 | then | |
2415 | null; | |
3192631e | 2416 | |
bea993f9 | 2417 | else |
3192631e | 2418 | Rewrite (Prefix (N), |
0d4aed99 | 2419 | Convert_To (Btyp_DDT, |
3192631e JM |
2420 | New_Copy_Tree (Prefix (N)))); |
2421 | ||
0d4aed99 | 2422 | Analyze_And_Resolve (Prefix (N), Btyp_DDT); |
70482933 | 2423 | end if; |
758c442c | 2424 | |
3192631e JM |
2425 | -- When the object is an explicit dereference, convert the |
2426 | -- dereference's prefix. | |
3e8ee849 | 2427 | |
3192631e JM |
2428 | else |
2429 | declare | |
2430 | Obj_DDT : constant Entity_Id := | |
2431 | Base_Type | |
2432 | (Directly_Designated_Type | |
2433 | (Etype (Prefix (Ref_Object)))); | |
2434 | begin | |
2435 | -- No implicit conversion required if designated types | |
904a2ae4 | 2436 | -- match. |
3192631e JM |
2437 | |
2438 | if Obj_DDT /= Btyp_DDT | |
2439 | and then not (Is_Class_Wide_Type (Obj_DDT) | |
3b59004a | 2440 | and then Etype (Obj_DDT) = Btyp_DDT) |
3192631e JM |
2441 | then |
2442 | Rewrite (N, | |
2443 | Convert_To (Typ, | |
2444 | New_Copy_Tree (Prefix (Ref_Object)))); | |
2445 | Analyze_And_Resolve (N, Typ); | |
2446 | end if; | |
2447 | end; | |
70482933 | 2448 | end if; |
3192631e JM |
2449 | end if; |
2450 | end Access_Cases; | |
70482933 RK |
2451 | |
2452 | -------------- | |
2453 | -- Adjacent -- | |
2454 | -------------- | |
2455 | ||
2456 | -- Transforms 'Adjacent into a call to the floating-point attribute | |
2457 | -- function Adjacent in Fat_xxx (where xxx is the root type) | |
2458 | ||
2459 | when Attribute_Adjacent => | |
2460 | Expand_Fpt_Attribute_RR (N); | |
2461 | ||
2462 | ------------- | |
2463 | -- Address -- | |
2464 | ------------- | |
2465 | ||
2466 | when Attribute_Address => Address : declare | |
2467 | Task_Proc : Entity_Id; | |
2468 | ||
47997d25 GD |
2469 | function Is_Unnested_Component_Init (N : Node_Id) return Boolean; |
2470 | -- Returns True if N is being used to initialize a component of | |
2471 | -- an activation record object where the component corresponds to | |
2472 | -- the object denoted by the prefix of the attribute N. | |
2473 | ||
2474 | function Is_Unnested_Component_Init (N : Node_Id) return Boolean is | |
2475 | begin | |
2476 | return Present (Parent (N)) | |
2477 | and then Nkind (Parent (N)) = N_Assignment_Statement | |
2478 | and then Is_Entity_Name (Pref) | |
2479 | and then Present (Activation_Record_Component (Entity (Pref))) | |
2480 | and then Nkind (Name (Parent (N))) = N_Selected_Component | |
2481 | and then Entity (Selector_Name (Name (Parent (N)))) = | |
2482 | Activation_Record_Component (Entity (Pref)); | |
2483 | end Is_Unnested_Component_Init; | |
2484 | ||
2485 | -- Start of processing for Address | |
2486 | ||
70482933 | 2487 | begin |
3e8ee849 RD |
2488 | -- If the prefix is a task or a task type, the useful address is that |
2489 | -- of the procedure for the task body, i.e. the actual program unit. | |
2490 | -- We replace the original entity with that of the procedure. | |
70482933 RK |
2491 | |
2492 | if Is_Entity_Name (Pref) | |
2493 | and then Is_Task_Type (Entity (Pref)) | |
2494 | then | |
21d27997 | 2495 | Task_Proc := Next_Entity (Root_Type (Ptyp)); |
70482933 RK |
2496 | |
2497 | while Present (Task_Proc) loop | |
2498 | exit when Ekind (Task_Proc) = E_Procedure | |
2499 | and then Etype (First_Formal (Task_Proc)) = | |
21d27997 | 2500 | Corresponding_Record_Type (Ptyp); |
70482933 RK |
2501 | Next_Entity (Task_Proc); |
2502 | end loop; | |
2503 | ||
2504 | if Present (Task_Proc) then | |
2505 | Set_Entity (Pref, Task_Proc); | |
2506 | Set_Etype (Pref, Etype (Task_Proc)); | |
2507 | end if; | |
2508 | ||
2509 | -- Similarly, the address of a protected operation is the address | |
2510 | -- of the corresponding protected body, regardless of the protected | |
2511 | -- object from which it is selected. | |
2512 | ||
2513 | elsif Nkind (Pref) = N_Selected_Component | |
2514 | and then Is_Subprogram (Entity (Selector_Name (Pref))) | |
2515 | and then Is_Protected_Type (Scope (Entity (Selector_Name (Pref)))) | |
2516 | then | |
2517 | Rewrite (Pref, | |
2518 | New_Occurrence_Of ( | |
2519 | External_Subprogram (Entity (Selector_Name (Pref))), Loc)); | |
2520 | ||
2521 | elsif Nkind (Pref) = N_Explicit_Dereference | |
21d27997 RD |
2522 | and then Ekind (Ptyp) = E_Subprogram_Type |
2523 | and then Convention (Ptyp) = Convention_Protected | |
70482933 RK |
2524 | then |
2525 | -- The prefix is be a dereference of an access_to_protected_ | |
2526 | -- subprogram. The desired address is the second component of | |
2527 | -- the record that represents the access. | |
2528 | ||
2529 | declare | |
2530 | Addr : constant Entity_Id := Etype (N); | |
2531 | Ptr : constant Node_Id := Prefix (Pref); | |
2532 | T : constant Entity_Id := | |
2533 | Equivalent_Type (Base_Type (Etype (Ptr))); | |
2534 | ||
2535 | begin | |
2536 | Rewrite (N, | |
2537 | Unchecked_Convert_To (Addr, | |
2538 | Make_Selected_Component (Loc, | |
2539 | Prefix => Unchecked_Convert_To (T, Ptr), | |
2540 | Selector_Name => New_Occurrence_Of ( | |
2541 | Next_Entity (First_Entity (T)), Loc)))); | |
2542 | ||
2543 | Analyze_And_Resolve (N, Addr); | |
2544 | end; | |
0669bebe GB |
2545 | |
2546 | -- Ada 2005 (AI-251): Class-wide interface objects are always | |
2547 | -- "displaced" to reference the tag associated with the interface | |
2548 | -- type. In order to obtain the real address of such objects we | |
2549 | -- generate a call to a run-time subprogram that returns the base | |
47997d25 GD |
2550 | -- address of the object. This call is not generated in cases where |
2551 | -- the attribute is being used to initialize a component of an | |
2552 | -- activation record object where the component corresponds to | |
2553 | -- prefix of the attribute (for back ends that require "unnesting" | |
2554 | -- of nested subprograms), since the address needs to be assigned | |
2555 | -- as-is to such components. | |
0669bebe | 2556 | |
21d27997 | 2557 | elsif Is_Class_Wide_Type (Ptyp) |
63a5b3dc | 2558 | and then Is_Interface (Underlying_Type (Ptyp)) |
1f110335 | 2559 | and then Tagged_Type_Expansion |
31104818 HK |
2560 | and then not (Nkind (Pref) in N_Has_Entity |
2561 | and then Is_Subprogram (Entity (Pref))) | |
47997d25 | 2562 | and then not Is_Unnested_Component_Init (N) |
0669bebe GB |
2563 | then |
2564 | Rewrite (N, | |
2565 | Make_Function_Call (Loc, | |
e4494292 | 2566 | Name => New_Occurrence_Of (RTE (RE_Base_Address), Loc), |
0669bebe GB |
2567 | Parameter_Associations => New_List ( |
2568 | Relocate_Node (N)))); | |
2569 | Analyze (N); | |
2570 | return; | |
70482933 RK |
2571 | end if; |
2572 | ||
21d27997 RD |
2573 | -- Deal with packed array reference, other cases are handled by |
2574 | -- the back end. | |
70482933 RK |
2575 | |
2576 | if Involves_Packed_Array_Reference (Pref) then | |
2577 | Expand_Packed_Address_Reference (N); | |
2578 | end if; | |
2579 | end Address; | |
2580 | ||
fbf5a39b AC |
2581 | --------------- |
2582 | -- Alignment -- | |
2583 | --------------- | |
2584 | ||
2585 | when Attribute_Alignment => Alignment : declare | |
fbf5a39b AC |
2586 | New_Node : Node_Id; |
2587 | ||
2588 | begin | |
2589 | -- For class-wide types, X'Class'Alignment is transformed into a | |
2590 | -- direct reference to the Alignment of the class type, so that the | |
2591 | -- back end does not have to deal with the X'Class'Alignment | |
2592 | -- reference. | |
2593 | ||
2594 | if Is_Entity_Name (Pref) | |
2595 | and then Is_Class_Wide_Type (Entity (Pref)) | |
2596 | then | |
2597 | Rewrite (Prefix (N), New_Occurrence_Of (Entity (Pref), Loc)); | |
2598 | return; | |
2599 | ||
2600 | -- For x'Alignment applied to an object of a class wide type, | |
2601 | -- transform X'Alignment into a call to the predefined primitive | |
2602 | -- operation _Alignment applied to X. | |
2603 | ||
2604 | elsif Is_Class_Wide_Type (Ptyp) then | |
2605 | New_Node := | |
d9937d1b AC |
2606 | Make_Attribute_Reference (Loc, |
2607 | Prefix => Pref, | |
2608 | Attribute_Name => Name_Tag); | |
2609 | ||
535a8637 | 2610 | New_Node := Build_Get_Alignment (Loc, New_Node); |
fbf5a39b | 2611 | |
445514c0 EB |
2612 | -- Case where the context is an unchecked conversion to a specific |
2613 | -- integer type. We directly convert from the alignment's type. | |
2614 | ||
2615 | if Nkind (Parent (N)) = N_Unchecked_Type_Conversion then | |
2616 | Rewrite (N, New_Node); | |
2617 | Analyze_And_Resolve (N); | |
2618 | return; | |
2619 | ||
033eaf85 | 2620 | -- Case where the context is a specific integer type with which |
33b9e989 EB |
2621 | -- the original attribute was compatible. But the alignment has a |
2622 | -- specific type in a-tags.ads (Standard.Natural) so, in order to | |
2623 | -- preserve type compatibility, we must convert explicitly. | |
fbf5a39b | 2624 | |
445514c0 | 2625 | elsif Typ /= Standard_Natural then |
fbf5a39b AC |
2626 | New_Node := Convert_To (Typ, New_Node); |
2627 | end if; | |
2628 | ||
2629 | Rewrite (N, New_Node); | |
2630 | Analyze_And_Resolve (N, Typ); | |
2631 | return; | |
2632 | ||
2633 | -- For all other cases, we just have to deal with the case of | |
2634 | -- the fact that the result can be universal. | |
2635 | ||
2636 | else | |
2637 | Apply_Universal_Integer_Attribute_Checks (N); | |
2638 | end if; | |
2639 | end Alignment; | |
2640 | ||
3874e79d EB |
2641 | --------------------------- |
2642 | -- Asm_Input, Asm_Output -- | |
2643 | --------------------------- | |
2644 | ||
2645 | -- The Asm_Input and Asm_Output attributes are not expanded at this | |
2646 | -- stage, but will be eliminated in the expansion of the Asm call, | |
2647 | -- see Exp_Intr for details. So the back end will never see them. | |
2648 | ||
2649 | when Attribute_Asm_Input | |
2650 | | Attribute_Asm_Output | |
2651 | => | |
2652 | null; | |
2653 | ||
47d3b920 AC |
2654 | --------- |
2655 | -- Bit -- | |
2656 | --------- | |
2657 | ||
2658 | -- We compute this if a packed array reference was present, otherwise we | |
2659 | -- leave the computation up to the back end. | |
2660 | ||
2661 | when Attribute_Bit => | |
2662 | if Involves_Packed_Array_Reference (Pref) then | |
2663 | Expand_Packed_Bit_Reference (N); | |
2664 | else | |
2665 | Apply_Universal_Integer_Attribute_Checks (N); | |
2666 | end if; | |
2667 | ||
70482933 RK |
2668 | ------------------ |
2669 | -- Bit_Position -- | |
2670 | ------------------ | |
2671 | ||
12be130c EB |
2672 | -- We leave the computation up to the back end, since we don't know what |
2673 | -- layout will be chosen if no component clause was specified. | |
70482933 | 2674 | |
12be130c EB |
2675 | when Attribute_Bit_Position => |
2676 | Apply_Universal_Integer_Attribute_Checks (N); | |
70482933 RK |
2677 | |
2678 | ------------------ | |
2679 | -- Body_Version -- | |
2680 | ------------------ | |
2681 | ||
2682 | -- A reference to P'Body_Version or P'Version is expanded to | |
2683 | ||
2684 | -- Vnn : Unsigned; | |
69a0c174 | 2685 | -- pragma Import (C, Vnn, "uuuuT"); |
70482933 RK |
2686 | -- ... |
2687 | -- Get_Version_String (Vnn) | |
2688 | ||
2689 | -- where uuuu is the unit name (dots replaced by double underscore) | |
2690 | -- and T is B for the cases of Body_Version, or Version applied to a | |
2691 | -- subprogram acting as its own spec, and S for Version applied to a | |
2692 | -- subprogram spec or package. This sequence of code references the | |
308e6f3a | 2693 | -- unsigned constant created in the main program by the binder. |
70482933 | 2694 | |
5c52bf3b AC |
2695 | -- A special exception occurs for Standard, where the string returned |
2696 | -- is a copy of the library string in gnatvsn.ads. | |
70482933 | 2697 | |
d8f43ee6 HK |
2698 | when Attribute_Body_Version |
2699 | | Attribute_Version | |
2700 | => | |
2701 | Version : declare | |
2702 | E : constant Entity_Id := Make_Temporary (Loc, 'V'); | |
2703 | Pent : Entity_Id; | |
2704 | S : String_Id; | |
70482933 | 2705 | |
d8f43ee6 HK |
2706 | begin |
2707 | -- If not library unit, get to containing library unit | |
2708 | ||
2709 | Pent := Entity (Pref); | |
2710 | while Pent /= Standard_Standard | |
2711 | and then Scope (Pent) /= Standard_Standard | |
2712 | and then not Is_Child_Unit (Pent) | |
2713 | loop | |
2714 | Pent := Scope (Pent); | |
2715 | end loop; | |
70482933 | 2716 | |
d8f43ee6 | 2717 | -- Special case Standard and Standard.ASCII |
70482933 | 2718 | |
d8f43ee6 HK |
2719 | if Pent = Standard_Standard or else Pent = Standard_ASCII then |
2720 | Rewrite (N, | |
2721 | Make_String_Literal (Loc, | |
2722 | Strval => Verbose_Library_Version)); | |
70482933 | 2723 | |
d8f43ee6 | 2724 | -- All other cases |
70482933 | 2725 | |
d8f43ee6 HK |
2726 | else |
2727 | -- Build required string constant | |
70482933 | 2728 | |
d8f43ee6 | 2729 | Get_Name_String (Get_Unit_Name (Pent)); |
70482933 | 2730 | |
d8f43ee6 HK |
2731 | Start_String; |
2732 | for J in 1 .. Name_Len - 2 loop | |
2733 | if Name_Buffer (J) = '.' then | |
2734 | Store_String_Chars ("__"); | |
2735 | else | |
2736 | Store_String_Char (Get_Char_Code (Name_Buffer (J))); | |
2737 | end if; | |
2738 | end loop; | |
70482933 | 2739 | |
d8f43ee6 | 2740 | -- Case of subprogram acting as its own spec, always use body |
70482933 | 2741 | |
d8f43ee6 HK |
2742 | if Nkind (Declaration_Node (Pent)) in N_Subprogram_Specification |
2743 | and then Nkind (Parent (Declaration_Node (Pent))) = | |
2744 | N_Subprogram_Body | |
2745 | and then Acts_As_Spec (Parent (Declaration_Node (Pent))) | |
2746 | then | |
2747 | Store_String_Chars ("B"); | |
70482933 | 2748 | |
d8f43ee6 | 2749 | -- Case of no body present, always use spec |
70482933 | 2750 | |
d8f43ee6 HK |
2751 | elsif not Unit_Requires_Body (Pent) then |
2752 | Store_String_Chars ("S"); | |
70482933 | 2753 | |
d8f43ee6 | 2754 | -- Otherwise use B for Body_Version, S for spec |
70482933 | 2755 | |
d8f43ee6 HK |
2756 | elsif Id = Attribute_Body_Version then |
2757 | Store_String_Chars ("B"); | |
2758 | else | |
2759 | Store_String_Chars ("S"); | |
2760 | end if; | |
70482933 | 2761 | |
d8f43ee6 HK |
2762 | S := End_String; |
2763 | Lib.Version_Referenced (S); | |
70482933 | 2764 | |
d8f43ee6 | 2765 | -- Insert the object declaration |
70482933 | 2766 | |
d8f43ee6 HK |
2767 | Insert_Actions (N, New_List ( |
2768 | Make_Object_Declaration (Loc, | |
2769 | Defining_Identifier => E, | |
2770 | Object_Definition => | |
2771 | New_Occurrence_Of (RTE (RE_Unsigned), Loc)))); | |
70482933 | 2772 | |
d8f43ee6 | 2773 | -- Set entity as imported with correct external name |
70482933 | 2774 | |
d8f43ee6 HK |
2775 | Set_Is_Imported (E); |
2776 | Set_Interface_Name (E, Make_String_Literal (Loc, S)); | |
70482933 | 2777 | |
d8f43ee6 HK |
2778 | -- Set entity as internal to ensure proper Sprint output of its |
2779 | -- implicit importation. | |
3e8ee849 | 2780 | |
d8f43ee6 | 2781 | Set_Is_Internal (E); |
3e8ee849 | 2782 | |
d8f43ee6 | 2783 | -- And now rewrite original reference |
70482933 | 2784 | |
d8f43ee6 HK |
2785 | Rewrite (N, |
2786 | Make_Function_Call (Loc, | |
2787 | Name => | |
2788 | New_Occurrence_Of (RTE (RE_Get_Version_String), Loc), | |
2789 | Parameter_Associations => New_List ( | |
2790 | New_Occurrence_Of (E, Loc)))); | |
2791 | end if; | |
70482933 | 2792 | |
d8f43ee6 HK |
2793 | Analyze_And_Resolve (N, RTE (RE_Version_String)); |
2794 | end Version; | |
70482933 RK |
2795 | |
2796 | ------------- | |
2797 | -- Ceiling -- | |
2798 | ------------- | |
2799 | ||
2800 | -- Transforms 'Ceiling into a call to the floating-point attribute | |
2801 | -- function Ceiling in Fat_xxx (where xxx is the root type) | |
2802 | ||
2803 | when Attribute_Ceiling => | |
2804 | Expand_Fpt_Attribute_R (N); | |
2805 | ||
2806 | -------------- | |
2807 | -- Callable -- | |
2808 | -------------- | |
2809 | ||
758c442c | 2810 | -- Transforms 'Callable attribute into a call to the Callable function |
70482933 | 2811 | |
d8f43ee6 | 2812 | when Attribute_Callable => |
99bba92c | 2813 | |
65f01153 RD |
2814 | -- We have an object of a task interface class-wide type as a prefix |
2815 | -- to Callable. Generate: | |
31104818 | 2816 | -- callable (Task_Id (Pref._disp_get_task_id)); |
65f01153 | 2817 | |
0791fbe9 | 2818 | if Ada_Version >= Ada_2005 |
21d27997 RD |
2819 | and then Ekind (Ptyp) = E_Class_Wide_Type |
2820 | and then Is_Interface (Ptyp) | |
2821 | and then Is_Task_Interface (Ptyp) | |
65f01153 | 2822 | then |
99bba92c AC |
2823 | Rewrite (N, |
2824 | Make_Function_Call (Loc, | |
c0e938d0 | 2825 | Name => |
99bba92c AC |
2826 | New_Occurrence_Of (RTE (RE_Callable), Loc), |
2827 | Parameter_Associations => New_List ( | |
738a0e8d BD |
2828 | Unchecked_Convert_To |
2829 | (RTE (RO_ST_Task_Id), | |
2830 | Build_Disp_Get_Task_Id_Call (Pref))))); | |
31104818 | 2831 | |
65f01153 | 2832 | else |
99bba92c | 2833 | Rewrite (N, Build_Call_With_Task (Pref, RTE (RE_Callable))); |
65f01153 RD |
2834 | end if; |
2835 | ||
70482933 | 2836 | Analyze_And_Resolve (N, Standard_Boolean); |
70482933 RK |
2837 | |
2838 | ------------ | |
2839 | -- Caller -- | |
2840 | ------------ | |
2841 | ||
2842 | -- Transforms 'Caller attribute into a call to either the | |
2843 | -- Task_Entry_Caller or the Protected_Entry_Caller function. | |
2844 | ||
2845 | when Attribute_Caller => Caller : declare | |
b5e792e2 | 2846 | Id_Kind : constant Entity_Id := RTE (RO_AT_Task_Id); |
fbf5a39b AC |
2847 | Ent : constant Entity_Id := Entity (Pref); |
2848 | Conctype : constant Entity_Id := Scope (Ent); | |
97a26d19 | 2849 | Nest_Depth : Nat := 0; |
70482933 RK |
2850 | Name : Node_Id; |
2851 | S : Entity_Id; | |
2852 | ||
2853 | begin | |
2854 | -- Protected case | |
2855 | ||
2856 | if Is_Protected_Type (Conctype) then | |
e10dab7f JM |
2857 | case Corresponding_Runtime_Package (Conctype) is |
2858 | when System_Tasking_Protected_Objects_Entries => | |
2859 | Name := | |
e4494292 | 2860 | New_Occurrence_Of |
e10dab7f JM |
2861 | (RTE (RE_Protected_Entry_Caller), Loc); |
2862 | ||
2863 | when System_Tasking_Protected_Objects_Single_Entry => | |
2864 | Name := | |
e4494292 | 2865 | New_Occurrence_Of |
e10dab7f JM |
2866 | (RTE (RE_Protected_Single_Entry_Caller), Loc); |
2867 | ||
2868 | when others => | |
2869 | raise Program_Error; | |
2870 | end case; | |
70482933 RK |
2871 | |
2872 | Rewrite (N, | |
2873 | Unchecked_Convert_To (Id_Kind, | |
2874 | Make_Function_Call (Loc, | |
2875 | Name => Name, | |
21d27997 | 2876 | Parameter_Associations => New_List ( |
e4494292 | 2877 | New_Occurrence_Of |
21d27997 | 2878 | (Find_Protection_Object (Current_Scope), Loc))))); |
70482933 RK |
2879 | |
2880 | -- Task case | |
2881 | ||
2882 | else | |
2883 | -- Determine the nesting depth of the E'Caller attribute, that | |
2884 | -- is, how many accept statements are nested within the accept | |
2885 | -- statement for E at the point of E'Caller. The runtime uses | |
2886 | -- this depth to find the specified entry call. | |
2887 | ||
2888 | for J in reverse 0 .. Scope_Stack.Last loop | |
2889 | S := Scope_Stack.Table (J).Entity; | |
2890 | ||
2891 | -- We should not reach the scope of the entry, as it should | |
2892 | -- already have been checked in Sem_Attr that this attribute | |
2893 | -- reference is within a matching accept statement. | |
2894 | ||
2895 | pragma Assert (S /= Conctype); | |
2896 | ||
2897 | if S = Ent then | |
2898 | exit; | |
2899 | ||
2900 | elsif Is_Entry (S) then | |
2901 | Nest_Depth := Nest_Depth + 1; | |
2902 | end if; | |
2903 | end loop; | |
2904 | ||
2905 | Rewrite (N, | |
2906 | Unchecked_Convert_To (Id_Kind, | |
2907 | Make_Function_Call (Loc, | |
21d27997 | 2908 | Name => |
e4494292 | 2909 | New_Occurrence_Of (RTE (RE_Task_Entry_Caller), Loc), |
70482933 RK |
2910 | Parameter_Associations => New_List ( |
2911 | Make_Integer_Literal (Loc, | |
97a26d19 | 2912 | Intval => Nest_Depth))))); |
70482933 RK |
2913 | end if; |
2914 | ||
2915 | Analyze_And_Resolve (N, Id_Kind); | |
2916 | end Caller; | |
2917 | ||
3874e79d EB |
2918 | -------------------- |
2919 | -- Component_Size -- | |
2920 | -------------------- | |
2921 | ||
2922 | -- Component_Size is handled by the back end | |
2923 | ||
2924 | when Attribute_Component_Size => | |
2925 | Apply_Universal_Integer_Attribute_Checks (N); | |
2926 | ||
70482933 RK |
2927 | ------------- |
2928 | -- Compose -- | |
2929 | ------------- | |
2930 | ||
2931 | -- Transforms 'Compose into a call to the floating-point attribute | |
2932 | -- function Compose in Fat_xxx (where xxx is the root type) | |
2933 | ||
2934 | -- Note: we strictly should have special code here to deal with the | |
2935 | -- case of absurdly negative arguments (less than Integer'First) | |
2936 | -- which will return a (signed) zero value, but it hardly seems | |
2937 | -- worth the effort. Absurdly large positive arguments will raise | |
2938 | -- constraint error which is fine. | |
2939 | ||
2940 | when Attribute_Compose => | |
2941 | Expand_Fpt_Attribute_RI (N); | |
2942 | ||
2943 | ----------------- | |
2944 | -- Constrained -- | |
2945 | ----------------- | |
2946 | ||
2947 | when Attribute_Constrained => Constrained : declare | |
2948 | Formal_Ent : constant Entity_Id := Param_Entity (Pref); | |
2949 | ||
2950 | begin | |
2951 | -- Reference to a parameter where the value is passed as an extra | |
2952 | -- actual, corresponding to the extra formal referenced by the | |
fbf5a39b AC |
2953 | -- Extra_Constrained field of the corresponding formal. If this |
2954 | -- is an entry in-parameter, it is replaced by a constant renaming | |
2955 | -- for which Extra_Constrained is never created. | |
70482933 RK |
2956 | |
2957 | if Present (Formal_Ent) | |
fbf5a39b | 2958 | and then Ekind (Formal_Ent) /= E_Constant |
70482933 RK |
2959 | and then Present (Extra_Constrained (Formal_Ent)) |
2960 | then | |
2961 | Rewrite (N, | |
2962 | New_Occurrence_Of | |
3a6fa9a8 | 2963 | (Extra_Constrained (Formal_Ent), Loc)); |
70482933 | 2964 | |
ed323421 AC |
2965 | -- If the prefix is an access to object, the attribute applies to |
2966 | -- the designated object, so rewrite with an explicit dereference. | |
2967 | ||
10e168cd | 2968 | elsif Is_Access_Type (Ptyp) |
ed323421 AC |
2969 | and then |
2970 | (not Is_Entity_Name (Pref) or else Is_Object (Entity (Pref))) | |
2971 | then | |
2972 | Rewrite (Pref, | |
2973 | Make_Explicit_Dereference (Loc, Relocate_Node (Pref))); | |
ed323421 | 2974 | |
70482933 RK |
2975 | -- For variables with a Extra_Constrained field, we use the |
2976 | -- corresponding entity. | |
2977 | ||
2978 | elsif Nkind (Pref) = N_Identifier | |
2979 | and then Ekind (Entity (Pref)) = E_Variable | |
2980 | and then Present (Extra_Constrained (Entity (Pref))) | |
2981 | then | |
2982 | Rewrite (N, | |
2983 | New_Occurrence_Of | |
3a6fa9a8 | 2984 | (Extra_Constrained (Entity (Pref)), Loc)); |
70482933 | 2985 | |
d2880e69 | 2986 | -- For all other cases, we can tell at compile time |
be42aa71 | 2987 | |
d2880e69 CD |
2988 | else |
2989 | -- For access type, apply access check as needed | |
70482933 | 2990 | |
d2880e69 CD |
2991 | if Is_Entity_Name (Pref) |
2992 | and then not Is_Type (Entity (Pref)) | |
2993 | and then Is_Access_Type (Ptyp) | |
2994 | then | |
2995 | Apply_Access_Check (N); | |
2996 | end if; | |
70482933 | 2997 | |
aa720a54 | 2998 | Rewrite (N, |
d2880e69 CD |
2999 | New_Occurrence_Of |
3000 | (Boolean_Literals | |
3a6fa9a8 | 3001 | (Exp_Util.Attribute_Constrained_Static_Value (Pref)), Loc)); |
70482933 RK |
3002 | end if; |
3003 | ||
3004 | Analyze_And_Resolve (N, Standard_Boolean); | |
3005 | end Constrained; | |
3006 | ||
3007 | --------------- | |
3008 | -- Copy_Sign -- | |
3009 | --------------- | |
3010 | ||
3011 | -- Transforms 'Copy_Sign into a call to the floating-point attribute | |
90cb252f | 3012 | -- function Copy_Sign in Fat_xxx (where xxx is the root type). |
70482933 RK |
3013 | |
3014 | when Attribute_Copy_Sign => | |
3015 | Expand_Fpt_Attribute_RR (N); | |
3016 | ||
3017 | ----------- | |
3018 | -- Count -- | |
3019 | ----------- | |
3020 | ||
3021 | -- Transforms 'Count attribute into a call to the Count function | |
3022 | ||
21d27997 RD |
3023 | when Attribute_Count => Count : declare |
3024 | Call : Node_Id; | |
3025 | Conctyp : Entity_Id; | |
3026 | Entnam : Node_Id; | |
3027 | Entry_Id : Entity_Id; | |
3028 | Index : Node_Id; | |
3029 | Name : Node_Id; | |
70482933 RK |
3030 | |
3031 | begin | |
3032 | -- If the prefix is a member of an entry family, retrieve both | |
3033 | -- entry name and index. For a simple entry there is no index. | |
3034 | ||
3035 | if Nkind (Pref) = N_Indexed_Component then | |
3036 | Entnam := Prefix (Pref); | |
3037 | Index := First (Expressions (Pref)); | |
3038 | else | |
3039 | Entnam := Pref; | |
3040 | Index := Empty; | |
3041 | end if; | |
3042 | ||
21d27997 RD |
3043 | Entry_Id := Entity (Entnam); |
3044 | ||
70482933 RK |
3045 | -- Find the concurrent type in which this attribute is referenced |
3046 | -- (there had better be one). | |
3047 | ||
3048 | Conctyp := Current_Scope; | |
3049 | while not Is_Concurrent_Type (Conctyp) loop | |
3050 | Conctyp := Scope (Conctyp); | |
3051 | end loop; | |
3052 | ||
3053 | -- Protected case | |
3054 | ||
3055 | if Is_Protected_Type (Conctyp) then | |
97710dc7 JM |
3056 | |
3057 | -- No need to transform 'Count into a function call if the current | |
3058 | -- scope has been eliminated. In this case such transformation is | |
3059 | -- also not viable because the enclosing protected object is not | |
3060 | -- available. | |
3061 | ||
3062 | if Is_Eliminated (Current_Scope) then | |
3063 | return; | |
3064 | end if; | |
3065 | ||
e10dab7f JM |
3066 | case Corresponding_Runtime_Package (Conctyp) is |
3067 | when System_Tasking_Protected_Objects_Entries => | |
e4494292 | 3068 | Name := New_Occurrence_Of (RTE (RE_Protected_Count), Loc); |
e10dab7f JM |
3069 | |
3070 | Call := | |
3071 | Make_Function_Call (Loc, | |
d8f43ee6 | 3072 | Name => Name, |
e10dab7f | 3073 | Parameter_Associations => New_List ( |
e4494292 | 3074 | New_Occurrence_Of |
21d27997 RD |
3075 | (Find_Protection_Object (Current_Scope), Loc), |
3076 | Entry_Index_Expression | |
3077 | (Loc, Entry_Id, Index, Scope (Entry_Id)))); | |
e10dab7f JM |
3078 | |
3079 | when System_Tasking_Protected_Objects_Single_Entry => | |
21d27997 | 3080 | Name := |
e4494292 | 3081 | New_Occurrence_Of (RTE (RE_Protected_Count_Entry), Loc); |
e10dab7f JM |
3082 | |
3083 | Call := | |
3084 | Make_Function_Call (Loc, | |
d8f43ee6 | 3085 | Name => Name, |
e10dab7f | 3086 | Parameter_Associations => New_List ( |
e4494292 | 3087 | New_Occurrence_Of |
21d27997 RD |
3088 | (Find_Protection_Object (Current_Scope), Loc))); |
3089 | ||
e10dab7f JM |
3090 | when others => |
3091 | raise Program_Error; | |
e10dab7f | 3092 | end case; |
70482933 RK |
3093 | |
3094 | -- Task case | |
3095 | ||
3096 | else | |
3097 | Call := | |
3098 | Make_Function_Call (Loc, | |
e4494292 | 3099 | Name => New_Occurrence_Of (RTE (RE_Task_Count), Loc), |
70482933 | 3100 | Parameter_Associations => New_List ( |
21d27997 RD |
3101 | Entry_Index_Expression (Loc, |
3102 | Entry_Id, Index, Scope (Entry_Id)))); | |
70482933 RK |
3103 | end if; |
3104 | ||
3105 | -- The call returns type Natural but the context is universal integer | |
3106 | -- so any integer type is allowed. The attribute was already resolved | |
3107 | -- so its Etype is the required result type. If the base type of the | |
3108 | -- context type is other than Standard.Integer we put in a conversion | |
3109 | -- to the required type. This can be a normal typed conversion since | |
3110 | -- both input and output types of the conversion are integer types | |
3111 | ||
3112 | if Base_Type (Typ) /= Base_Type (Standard_Integer) then | |
3113 | Rewrite (N, Convert_To (Typ, Call)); | |
3114 | else | |
3115 | Rewrite (N, Call); | |
3116 | end if; | |
3117 | ||
3118 | Analyze_And_Resolve (N, Typ); | |
3119 | end Count; | |
3120 | ||
203ddcea AC |
3121 | --------------------- |
3122 | -- Descriptor_Size -- | |
3123 | --------------------- | |
3124 | ||
3874e79d | 3125 | -- Descriptor_Size is handled by the back end |
cb3d8731 | 3126 | |
12be130c EB |
3127 | when Attribute_Descriptor_Size => |
3128 | Apply_Universal_Integer_Attribute_Checks (N); | |
203ddcea | 3129 | |
70482933 RK |
3130 | --------------- |
3131 | -- Elab_Body -- | |
3132 | --------------- | |
3133 | ||
3134 | -- This processing is shared by Elab_Spec | |
3135 | ||
3136 | -- What we do is to insert the following declarations | |
3137 | ||
3138 | -- procedure tnn; | |
3139 | -- pragma Import (C, enn, "name___elabb/s"); | |
3140 | ||
3141 | -- and then the Elab_Body/Spec attribute is replaced by a reference | |
3142 | -- to this defining identifier. | |
3143 | ||
d8f43ee6 HK |
3144 | when Attribute_Elab_Body |
3145 | | Attribute_Elab_Spec | |
3146 | => | |
3f5a8fee | 3147 | -- Leave attribute unexpanded in CodePeer mode: the gnat2scil |
2c1a2cf3 | 3148 | -- back-end knows how to handle these attributes directly. |
3f5a8fee | 3149 | |
2c1a2cf3 | 3150 | if CodePeer_Mode then |
3f5a8fee AC |
3151 | return; |
3152 | end if; | |
3153 | ||
70482933 | 3154 | Elab_Body : declare |
191fcb3a | 3155 | Ent : constant Entity_Id := Make_Temporary (Loc, 'E'); |
70482933 RK |
3156 | Str : String_Id; |
3157 | Lang : Node_Id; | |
3158 | ||
3159 | procedure Make_Elab_String (Nod : Node_Id); | |
3160 | -- Given Nod, an identifier, or a selected component, put the | |
3161 | -- image into the current string literal, with double underline | |
3162 | -- between components. | |
3163 | ||
7ce611e2 ES |
3164 | ---------------------- |
3165 | -- Make_Elab_String -- | |
3166 | ---------------------- | |
3167 | ||
70482933 RK |
3168 | procedure Make_Elab_String (Nod : Node_Id) is |
3169 | begin | |
3170 | if Nkind (Nod) = N_Selected_Component then | |
3171 | Make_Elab_String (Prefix (Nod)); | |
535a8637 AC |
3172 | Store_String_Char ('_'); |
3173 | Store_String_Char ('_'); | |
70482933 RK |
3174 | Get_Name_String (Chars (Selector_Name (Nod))); |
3175 | ||
3176 | else | |
3177 | pragma Assert (Nkind (Nod) = N_Identifier); | |
3178 | Get_Name_String (Chars (Nod)); | |
3179 | end if; | |
3180 | ||
3181 | Store_String_Chars (Name_Buffer (1 .. Name_Len)); | |
3182 | end Make_Elab_String; | |
3183 | ||
3184 | -- Start of processing for Elab_Body/Elab_Spec | |
3185 | ||
3186 | begin | |
3187 | -- First we need to prepare the string literal for the name of | |
3188 | -- the elaboration routine to be referenced. | |
3189 | ||
3190 | Start_String; | |
3191 | Make_Elab_String (Pref); | |
535a8637 AC |
3192 | Store_String_Chars ("___elab"); |
3193 | Lang := Make_Identifier (Loc, Name_C); | |
70482933 RK |
3194 | |
3195 | if Id = Attribute_Elab_Body then | |
3196 | Store_String_Char ('b'); | |
3197 | else | |
3198 | Store_String_Char ('s'); | |
3199 | end if; | |
3200 | ||
3201 | Str := End_String; | |
3202 | ||
3203 | Insert_Actions (N, New_List ( | |
3204 | Make_Subprogram_Declaration (Loc, | |
3205 | Specification => | |
3206 | Make_Procedure_Specification (Loc, | |
3207 | Defining_Unit_Name => Ent)), | |
3208 | ||
3209 | Make_Pragma (Loc, | |
3860d469 | 3210 | Chars => Name_Import, |
70482933 | 3211 | Pragma_Argument_Associations => New_List ( |
7675ad4f | 3212 | Make_Pragma_Argument_Association (Loc, Expression => Lang), |
70482933 RK |
3213 | |
3214 | Make_Pragma_Argument_Association (Loc, | |
7675ad4f | 3215 | Expression => Make_Identifier (Loc, Chars (Ent))), |
70482933 RK |
3216 | |
3217 | Make_Pragma_Argument_Association (Loc, | |
7675ad4f | 3218 | Expression => Make_String_Literal (Loc, Str)))))); |
70482933 RK |
3219 | |
3220 | Set_Entity (N, Ent); | |
3221 | Rewrite (N, New_Occurrence_Of (Ent, Loc)); | |
3222 | end Elab_Body; | |
3223 | ||
2c1a2cf3 RD |
3224 | -------------------- |
3225 | -- Elab_Subp_Body -- | |
3226 | -------------------- | |
3227 | ||
3228 | -- Always ignored. In CodePeer mode, gnat2scil knows how to handle | |
3229 | -- this attribute directly, and if we are not in CodePeer mode it is | |
3230 | -- entirely ignored ??? | |
3231 | ||
3232 | when Attribute_Elab_Subp_Body => | |
3233 | return; | |
3234 | ||
70482933 RK |
3235 | ---------------- |
3236 | -- Elaborated -- | |
3237 | ---------------- | |
3238 | ||
21d27997 RD |
3239 | -- Elaborated is always True for preelaborated units, predefined units, |
3240 | -- pure units and units which have Elaborate_Body pragmas. These units | |
3241 | -- have no elaboration entity. | |
70482933 | 3242 | |
21d27997 | 3243 | -- Note: The Elaborated attribute is never passed to the back end |
70482933 RK |
3244 | |
3245 | when Attribute_Elaborated => Elaborated : declare | |
7327f5c2 | 3246 | Elab_Id : constant Entity_Id := Elaboration_Entity (Entity (Pref)); |
70482933 RK |
3247 | |
3248 | begin | |
7327f5c2 | 3249 | if Present (Elab_Id) then |
70482933 | 3250 | Rewrite (N, |
824e9320 | 3251 | Make_Op_Ne (Loc, |
7327f5c2 AC |
3252 | Left_Opnd => New_Occurrence_Of (Elab_Id, Loc), |
3253 | Right_Opnd => Make_Integer_Literal (Loc, Uint_0))); | |
3254 | ||
824e9320 | 3255 | Analyze_And_Resolve (N, Typ); |
70482933 RK |
3256 | else |
3257 | Rewrite (N, New_Occurrence_Of (Standard_True, Loc)); | |
3258 | end if; | |
3259 | end Elaborated; | |
3260 | ||
3261 | -------------- | |
3262 | -- Enum_Rep -- | |
3263 | -------------- | |
3264 | ||
1956beb8 BD |
3265 | when Attribute_Enum_Rep => Enum_Rep : declare |
3266 | Expr : Node_Id; | |
75e4e36d | 3267 | |
70482933 | 3268 | begin |
75e4e36d AC |
3269 | -- Get the expression, which is X for Enum_Type'Enum_Rep (X) or |
3270 | -- X'Enum_Rep. | |
70482933 RK |
3271 | |
3272 | if Is_Non_Empty_List (Exprs) then | |
1956beb8 BD |
3273 | Expr := First (Exprs); |
3274 | else | |
3275 | Expr := Pref; | |
3276 | end if; | |
70482933 | 3277 | |
c64ac479 PT |
3278 | -- If not constant-folded, Enum_Type'Enum_Rep (X) or X'Enum_Rep |
3279 | -- expands to | |
fbf5a39b | 3280 | |
bd55fa10 | 3281 | -- target-type!(X) |
1956beb8 | 3282 | |
bd55fa10 EB |
3283 | -- This is an unchecked conversion from the enumeration type to the |
3284 | -- target integer type, which is treated by the back end as a normal | |
3285 | -- integer conversion, treating the enumeration type as an integer, | |
3286 | -- which is exactly what we want. Unlike for the Pos attribute, we | |
3287 | -- cannot use a regular conversion since the associated check would | |
3288 | -- involve comparing the converted bounds, i.e. would involve the use | |
3289 | -- of 'Pos instead 'Enum_Rep for these bounds. | |
70482933 | 3290 | |
10e168cd EB |
3291 | -- However the target type is universal integer in most cases, which |
3292 | -- is a very large type, so in the case of an enumeration type, we | |
3293 | -- first convert to a small signed integer type in order not to lose | |
3294 | -- the size information. | |
3295 | ||
c64ac479 | 3296 | if Is_Enumeration_Type (Ptyp) then |
bd55fa10 | 3297 | Rewrite (N, Unchecked_Convert_To (Get_Integer_Type (Ptyp), Expr)); |
10e168cd EB |
3298 | Convert_To_And_Rewrite (Typ, N); |
3299 | ||
bd55fa10 EB |
3300 | -- Deal with integer types (replace by conversion) |
3301 | ||
70482933 | 3302 | else |
bd55fa10 | 3303 | Rewrite (N, Convert_To (Typ, Expr)); |
70482933 RK |
3304 | end if; |
3305 | ||
70482933 | 3306 | Analyze_And_Resolve (N, Typ); |
70482933 RK |
3307 | end Enum_Rep; |
3308 | ||
21d27997 RD |
3309 | -------------- |
3310 | -- Enum_Val -- | |
3311 | -------------- | |
3312 | ||
3313 | when Attribute_Enum_Val => Enum_Val : declare | |
3314 | Expr : Node_Id; | |
3315 | Btyp : constant Entity_Id := Base_Type (Ptyp); | |
3316 | ||
3317 | begin | |
3318 | -- X'Enum_Val (Y) expands to | |
3319 | ||
3320 | -- [constraint_error when _rep_to_pos (Y, False) = -1, msg] | |
3321 | -- X!(Y); | |
3322 | ||
3323 | Expr := Unchecked_Convert_To (Ptyp, First (Exprs)); | |
3324 | ||
fd90c808 EB |
3325 | -- Ensure that the expression is not truncated since the "bad" bits |
3326 | -- are desired. | |
3327 | ||
3328 | if Nkind (Expr) = N_Unchecked_Type_Conversion then | |
3329 | Set_No_Truncation (Expr); | |
3330 | end if; | |
3331 | ||
21d27997 RD |
3332 | Insert_Action (N, |
3333 | Make_Raise_Constraint_Error (Loc, | |
3334 | Condition => | |
3335 | Make_Op_Eq (Loc, | |
3336 | Left_Opnd => | |
3337 | Make_Function_Call (Loc, | |
3338 | Name => | |
e4494292 | 3339 | New_Occurrence_Of (TSS (Btyp, TSS_Rep_To_Pos), Loc), |
21d27997 RD |
3340 | Parameter_Associations => New_List ( |
3341 | Relocate_Node (Duplicate_Subexpr (Expr)), | |
3342 | New_Occurrence_Of (Standard_False, Loc))), | |
3343 | ||
3344 | Right_Opnd => Make_Integer_Literal (Loc, -1)), | |
3345 | Reason => CE_Range_Check_Failed)); | |
3346 | ||
3347 | Rewrite (N, Expr); | |
3348 | Analyze_And_Resolve (N, Ptyp); | |
3349 | end Enum_Val; | |
3350 | ||
70482933 RK |
3351 | -------------- |
3352 | -- Exponent -- | |
3353 | -------------- | |
3354 | ||
3355 | -- Transforms 'Exponent into a call to the floating-point attribute | |
3356 | -- function Exponent in Fat_xxx (where xxx is the root type) | |
3357 | ||
3358 | when Attribute_Exponent => | |
3359 | Expand_Fpt_Attribute_R (N); | |
3360 | ||
3361 | ------------------ | |
3362 | -- External_Tag -- | |
3363 | ------------------ | |
3364 | ||
3365 | -- transforme X'External_Tag into Ada.Tags.External_Tag (X'tag) | |
3366 | ||
d8f43ee6 | 3367 | when Attribute_External_Tag => |
70482933 RK |
3368 | Rewrite (N, |
3369 | Make_Function_Call (Loc, | |
d8f43ee6 HK |
3370 | Name => |
3371 | New_Occurrence_Of (RTE (RE_External_Tag), Loc), | |
70482933 RK |
3372 | Parameter_Associations => New_List ( |
3373 | Make_Attribute_Reference (Loc, | |
3374 | Attribute_Name => Name_Tag, | |
d8f43ee6 | 3375 | Prefix => Prefix (N))))); |
70482933 RK |
3376 | |
3377 | Analyze_And_Resolve (N, Standard_String); | |
70482933 | 3378 | |
f68d3344 JS |
3379 | ----------------------- |
3380 | -- Finalization_Size -- | |
3381 | ----------------------- | |
3382 | ||
3383 | when Attribute_Finalization_Size => Finalization_Size : declare | |
f68d3344 | 3384 | function Calculate_Header_Size return Node_Id; |
d9c59db4 AC |
3385 | -- Generate a runtime call to calculate the size of the hidden header |
3386 | -- along with any added padding which would precede a heap-allocated | |
3387 | -- object of the prefix type. | |
f68d3344 JS |
3388 | |
3389 | --------------------------- | |
3390 | -- Calculate_Header_Size -- | |
3391 | --------------------------- | |
3392 | ||
3393 | function Calculate_Header_Size return Node_Id is | |
3394 | begin | |
3395 | -- Generate: | |
10e168cd | 3396 | -- Typ (Header_Size_With_Padding (Pref'Alignment)) |
f68d3344 JS |
3397 | |
3398 | return | |
10e168cd | 3399 | Convert_To (Typ, |
f68d3344 JS |
3400 | Make_Function_Call (Loc, |
3401 | Name => | |
d9c59db4 AC |
3402 | New_Occurrence_Of (RTE (RE_Header_Size_With_Padding), Loc), |
3403 | ||
f68d3344 JS |
3404 | Parameter_Associations => New_List ( |
3405 | Make_Attribute_Reference (Loc, | |
d9c59db4 | 3406 | Prefix => New_Copy_Tree (Pref), |
f68d3344 JS |
3407 | Attribute_Name => Name_Alignment)))); |
3408 | end Calculate_Header_Size; | |
3409 | ||
d9c59db4 | 3410 | -- Local variables |
f68d3344 | 3411 | |
d9c59db4 | 3412 | Size : Entity_Id; |
f68d3344 | 3413 | |
90cb252f | 3414 | -- Start of processing for Finalization_Size |
f68d3344 JS |
3415 | |
3416 | begin | |
d9c59db4 | 3417 | -- An object of a class-wide type first requires a runtime check to |
f68d3344 JS |
3418 | -- determine whether it is actually controlled or not. Depending on |
3419 | -- the outcome of this check, the Finalization_Size of the object | |
3420 | -- may be zero or some positive value. | |
3421 | -- | |
d9c59db4 | 3422 | -- In this scenario, Pref'Finalization_Size is expanded into |
f68d3344 | 3423 | -- |
d9c59db4 | 3424 | -- Size : Integer := 0; |
f68d3344 | 3425 | -- |
d9c59db4 | 3426 | -- if Needs_Finalization (Pref'Tag) then |
10e168cd | 3427 | -- Size := Integer (Header_Size_With_Padding (Pref'Alignment)); |
d9c59db4 | 3428 | -- end if; |
f68d3344 JS |
3429 | -- |
3430 | -- and the attribute reference is replaced with a reference to Size. | |
3431 | ||
3432 | if Is_Class_Wide_Type (Ptyp) then | |
d9c59db4 AC |
3433 | Size := Make_Temporary (Loc, 'S'); |
3434 | ||
f68d3344 JS |
3435 | Insert_Actions (N, New_List ( |
3436 | ||
3437 | -- Generate: | |
3438 | -- Size : Integer := 0; | |
3439 | ||
3440 | Make_Object_Declaration (Loc, | |
3441 | Defining_Identifier => Size, | |
3442 | Object_Definition => | |
3443 | New_Occurrence_Of (Standard_Integer, Loc), | |
3444 | Expression => Make_Integer_Literal (Loc, 0)), | |
3445 | ||
3446 | -- Generate: | |
3447 | -- if Needs_Finalization (Pref'Tag) then | |
d9c59db4 | 3448 | -- Size := |
10e168cd | 3449 | -- Integer (Header_Size_With_Padding (Pref'Alignment)); |
f68d3344 JS |
3450 | -- end if; |
3451 | ||
3452 | Make_If_Statement (Loc, | |
3453 | Condition => | |
3454 | Make_Function_Call (Loc, | |
3455 | Name => | |
d9c59db4 AC |
3456 | New_Occurrence_Of (RTE (RE_Needs_Finalization), Loc), |
3457 | ||
f68d3344 JS |
3458 | Parameter_Associations => New_List ( |
3459 | Make_Attribute_Reference (Loc, | |
d9c59db4 AC |
3460 | Prefix => New_Copy_Tree (Pref), |
3461 | Attribute_Name => Name_Tag))), | |
3462 | ||
f68d3344 JS |
3463 | Then_Statements => New_List ( |
3464 | Make_Assignment_Statement (Loc, | |
3465 | Name => New_Occurrence_Of (Size, Loc), | |
10e168cd EB |
3466 | Expression => |
3467 | Convert_To | |
3468 | (Standard_Integer, Calculate_Header_Size)))))); | |
f68d3344 JS |
3469 | |
3470 | Rewrite (N, New_Occurrence_Of (Size, Loc)); | |
3471 | ||
d9c59db4 AC |
3472 | -- The prefix is known to be controlled at compile time. Calculate |
3473 | -- Finalization_Size by calling function Header_Size_With_Padding. | |
f68d3344 JS |
3474 | |
3475 | elsif Needs_Finalization (Ptyp) then | |
3476 | Rewrite (N, Calculate_Header_Size); | |
3477 | ||
d9c59db4 AC |
3478 | -- The prefix is not an object with controlled parts, so its |
3479 | -- Finalization_Size is zero. | |
f68d3344 JS |
3480 | |
3481 | else | |
3482 | Rewrite (N, Make_Integer_Literal (Loc, 0)); | |
3483 | end if; | |
3484 | ||
5f325af2 AC |
3485 | -- Due to cases where the entity type of the attribute is already |
3486 | -- resolved the rewritten N must get re-resolved to its appropriate | |
3487 | -- type. | |
3488 | ||
3489 | Analyze_And_Resolve (N, Typ); | |
f68d3344 JS |
3490 | end Finalization_Size; |
3491 | ||
ac8806c4 EB |
3492 | ----------------- |
3493 | -- First, Last -- | |
3494 | ----------------- | |
70482933 | 3495 | |
ac8806c4 EB |
3496 | when Attribute_First |
3497 | | Attribute_Last | |
3498 | => | |
70482933 | 3499 | -- If the prefix type is a constrained packed array type which |
8ca597af | 3500 | -- already has a Packed_Array_Impl_Type representation defined, then |
ac8806c4 EB |
3501 | -- replace this attribute with a direct reference to the attribute of |
3502 | -- the appropriate index subtype (since otherwise the back end will | |
3503 | -- try to give us the value of 'First for this implementation type). | |
08b0a5e2 GL |
3504 | -- Do not do this if Ptyp depends on a discriminant as its bounds |
3505 | -- are only available through N. | |
70482933 | 3506 | |
08b0a5e2 GL |
3507 | if Is_Constrained_Packed_Array (Ptyp) |
3508 | and then not Size_Depends_On_Discriminant (Ptyp) | |
3509 | then | |
70482933 RK |
3510 | Rewrite (N, |
3511 | Make_Attribute_Reference (Loc, | |
ac8806c4 | 3512 | Attribute_Name => Attribute_Name (N), |
41a58113 RD |
3513 | Prefix => |
3514 | New_Occurrence_Of (Get_Index_Subtype (N), Loc))); | |
70482933 RK |
3515 | Analyze_And_Resolve (N, Typ); |
3516 | ||
ac8806c4 EB |
3517 | -- For a constrained array type, if the bound is a reference to an |
3518 | -- entity which is not a discriminant, just replace with a direct | |
3519 | -- reference. Note that this must be in keeping with what is done | |
3520 | -- for scalar types in order for range checks to be elided in loops. | |
3521 | ||
d27ec3f6 EB |
3522 | -- However, avoid doing it if the array type is public because, in |
3523 | -- this case, we effectively rely on the back end to create public | |
3524 | -- symbols with consistent names across units for the array bounds. | |
3525 | ||
3526 | elsif Is_Array_Type (Ptyp) | |
3527 | and then Is_Constrained (Ptyp) | |
3528 | and then not Is_Public (Ptyp) | |
3529 | then | |
ac8806c4 EB |
3530 | declare |
3531 | Bnd : Node_Id; | |
3532 | ||
3533 | begin | |
3534 | if Id = Attribute_First then | |
3535 | Bnd := Type_Low_Bound (Get_Index_Subtype (N)); | |
3536 | else | |
3537 | Bnd := Type_High_Bound (Get_Index_Subtype (N)); | |
3538 | end if; | |
3539 | ||
3540 | if Is_Entity_Name (Bnd) | |
3541 | and then Ekind (Entity (Bnd)) /= E_Discriminant | |
3542 | then | |
3543 | Rewrite (N, New_Occurrence_Of (Entity (Bnd), Loc)); | |
3544 | end if; | |
3545 | end; | |
3546 | ||
41a58113 RD |
3547 | -- For access type, apply access check as needed |
3548 | ||
70482933 RK |
3549 | elsif Is_Access_Type (Ptyp) then |
3550 | Apply_Access_Check (N); | |
41a58113 | 3551 | |
ac8806c4 | 3552 | -- For scalar type, if the bound is a reference to an entity, just |
41a58113 RD |
3553 | -- replace with a direct reference. Note that we can only have a |
3554 | -- reference to a constant entity at this stage, anything else would | |
8e888920 | 3555 | -- have already been rewritten. |
41a58113 | 3556 | |
8e888920 | 3557 | elsif Is_Scalar_Type (Ptyp) then |
41a58113 | 3558 | declare |
ac8806c4 EB |
3559 | Bnd : Node_Id; |
3560 | ||
41a58113 | 3561 | begin |
ac8806c4 EB |
3562 | if Id = Attribute_First then |
3563 | Bnd := Type_Low_Bound (Ptyp); | |
3564 | else | |
3565 | Bnd := Type_High_Bound (Ptyp); | |
3566 | end if; | |
3567 | ||
cb52e9fe | 3568 | if Is_Entity_Name (Bnd) then |
ac8806c4 | 3569 | Rewrite (N, New_Occurrence_Of (Entity (Bnd), Loc)); |
41a58113 RD |
3570 | end if; |
3571 | end; | |
70482933 | 3572 | end if; |
70482933 RK |
3573 | |
3574 | --------------- | |
3575 | -- First_Bit -- | |
3576 | --------------- | |
3577 | ||
12be130c EB |
3578 | -- We leave the computation up to the back end, since we don't know what |
3579 | -- layout will be chosen if no component clause was specified. | |
70482933 | 3580 | |
12be130c EB |
3581 | when Attribute_First_Bit => |
3582 | Apply_Universal_Integer_Attribute_Checks (N); | |
70482933 | 3583 | |
304757d2 AC |
3584 | -------------------------------- |
3585 | -- Fixed_Value, Integer_Value -- | |
3586 | -------------------------------- | |
70482933 | 3587 | |
304757d2 | 3588 | -- We transform |
70482933 RK |
3589 | |
3590 | -- fixtype'Fixed_Value (integer-value) | |
8113b0c7 | 3591 | -- inttype'Integer_Value (fixed-value) |
70482933 RK |
3592 | |
3593 | -- into | |
3594 | ||
304757d2 AC |
3595 | -- fixtype (integer-value) |
3596 | -- inttype (fixed-value) | |
3597 | ||
3598 | -- respectively. | |
70482933 | 3599 | |
8113b0c7 EB |
3600 | -- We set Conversion_OK on the conversion because we do not want it |
3601 | -- to go through the fixed-point conversion circuits. | |
70482933 | 3602 | |
304757d2 AC |
3603 | when Attribute_Fixed_Value |
3604 | | Attribute_Integer_Value | |
3605 | => | |
8113b0c7 | 3606 | Rewrite (N, OK_Convert_To (Entity (Pref), First (Exprs))); |
fbf5a39b | 3607 | |
8113b0c7 | 3608 | -- Note that it might appear that a properly analyzed unchecked |
d8f43ee6 | 3609 | -- conversion would be just fine here, but that's not the case, |
8113b0c7 | 3610 | -- since the full range checks performed by the following calls |
d8f43ee6 | 3611 | -- are critical. |
fbf5a39b | 3612 | |
8113b0c7 EB |
3613 | Apply_Type_Conversion_Checks (N); |
3614 | ||
3615 | -- Note that Apply_Type_Conversion_Checks only deals with the | |
3616 | -- overflow checks on conversions involving fixed-point types | |
3617 | -- so we must apply range checks manually on them and expand. | |
3618 | ||
3619 | Apply_Scalar_Range_Check | |
3620 | (Expression (N), Etype (N), Fixed_Int => True); | |
3621 | ||
3622 | Set_Analyzed (N); | |
3623 | Expand (N); | |
70482933 RK |
3624 | |
3625 | ----------- | |
3626 | -- Floor -- | |
3627 | ----------- | |
3628 | ||
3629 | -- Transforms 'Floor into a call to the floating-point attribute | |
3630 | -- function Floor in Fat_xxx (where xxx is the root type) | |
3631 | ||
3632 | when Attribute_Floor => | |
3633 | Expand_Fpt_Attribute_R (N); | |
3634 | ||
3635 | ---------- | |
3636 | -- Fore -- | |
3637 | ---------- | |
3638 | ||
3639 | -- For the fixed-point type Typ: | |
3640 | ||
3641 | -- Typ'Fore | |
3642 | ||
3643 | -- expands into | |
3644 | ||
8d87bb8f EB |
3645 | -- System.Fore_xx (ftyp (Typ'First), ftyp (Typ'Last) [,pm]) |
3646 | ||
3647 | -- For decimal fixed-point types | |
3648 | -- xx = Decimal{32,64,128} | |
3649 | -- ftyp = Integer_{32,64,128} | |
3650 | -- pm = Typ'Scale | |
3651 | ||
3652 | -- For the most common ordinary fixed-point types | |
3653 | -- xx = Fixed{32,64,128} | |
3654 | -- ftyp = Integer_{32,64,128} | |
2bf891fa EB |
3655 | -- pm = numerator of Typ'Small |
3656 | -- denominator of Typ'Small | |
3657 | -- min (scale of Typ'Small, 0) | |
8d87bb8f EB |
3658 | |
3659 | -- For other ordinary fixed-point types | |
ec80b416 EB |
3660 | -- xx = Fixed |
3661 | -- ftyp = Long_Float | |
8d87bb8f | 3662 | -- pm = none |
70482933 | 3663 | |
d39f6b24 | 3664 | -- Note that we know that the type is a nonstatic subtype, or Fore would |
8d87bb8f | 3665 | -- have been computed statically in Eval_Attribute. |
70482933 | 3666 | |
d8f43ee6 | 3667 | when Attribute_Fore => |
8d87bb8f EB |
3668 | declare |
3669 | Arg_List : List_Id; | |
3670 | Fid : RE_Id; | |
3671 | Ftyp : Entity_Id; | |
70482933 | 3672 | |
8d87bb8f EB |
3673 | begin |
3674 | if Is_Decimal_Fixed_Point_Type (Ptyp) then | |
3675 | if Esize (Ptyp) <= 32 then | |
3676 | Fid := RE_Fore_Decimal32; | |
3677 | Ftyp := RTE (RE_Integer_32); | |
3678 | elsif Esize (Ptyp) <= 64 then | |
3679 | Fid := RE_Fore_Decimal64; | |
3680 | Ftyp := RTE (RE_Integer_64); | |
3681 | else | |
3682 | Fid := RE_Fore_Decimal128; | |
3683 | Ftyp := RTE (RE_Integer_128); | |
3684 | end if; | |
70482933 | 3685 | |
8d87bb8f EB |
3686 | else |
3687 | declare | |
3688 | Num : constant Uint := Norm_Num (Small_Value (Ptyp)); | |
3689 | Den : constant Uint := Norm_Den (Small_Value (Ptyp)); | |
3690 | Max : constant Uint := UI_Max (Num, Den); | |
3691 | Min : constant Uint := UI_Min (Num, Den); | |
3692 | Siz : constant Uint := Esize (Ptyp); | |
70482933 | 3693 | |
8d87bb8f EB |
3694 | begin |
3695 | if Siz <= 32 | |
8d87bb8f | 3696 | and then Max <= Uint_2 ** 31 |
2bf891fa EB |
3697 | and then (Min = Uint_1 |
3698 | or else Num < Den | |
3699 | or else Num < Uint_10 ** 8) | |
8d87bb8f EB |
3700 | then |
3701 | Fid := RE_Fore_Fixed32; | |
3702 | Ftyp := RTE (RE_Integer_32); | |
3703 | elsif Siz <= 64 | |
8d87bb8f | 3704 | and then Max <= Uint_2 ** 63 |
2bf891fa EB |
3705 | and then (Min = Uint_1 |
3706 | or else Num < Den | |
3707 | or else Num < Uint_10 ** 17) | |
8d87bb8f EB |
3708 | then |
3709 | Fid := RE_Fore_Fixed64; | |
3710 | Ftyp := RTE (RE_Integer_64); | |
3711 | elsif System_Max_Integer_Size = 128 | |
8d87bb8f | 3712 | and then Max <= Uint_2 ** 127 |
2bf891fa EB |
3713 | and then (Min = Uint_1 |
3714 | or else Num < Den | |
3715 | or else Num < Uint_10 ** 37) | |
8d87bb8f EB |
3716 | then |
3717 | Fid := RE_Fore_Fixed128; | |
3718 | Ftyp := RTE (RE_Integer_128); | |
3719 | else | |
ec80b416 EB |
3720 | Fid := RE_Fore_Fixed; |
3721 | Ftyp := Standard_Long_Float; | |
8d87bb8f EB |
3722 | end if; |
3723 | end; | |
3724 | end if; | |
3725 | ||
3726 | Arg_List := New_List ( | |
3727 | Convert_To (Ftyp, | |
3728 | Make_Attribute_Reference (Loc, | |
3729 | Prefix => New_Occurrence_Of (Ptyp, Loc), | |
3730 | Attribute_Name => Name_First))); | |
3731 | ||
3732 | Append_To (Arg_List, | |
3733 | Convert_To (Ftyp, | |
3734 | Make_Attribute_Reference (Loc, | |
3735 | Prefix => New_Occurrence_Of (Ptyp, Loc), | |
3736 | Attribute_Name => Name_Last))); | |
3737 | ||
3738 | -- For decimal, append Scale and also set to do literal conversion | |
3739 | ||
3740 | if Is_Decimal_Fixed_Point_Type (Ptyp) then | |
3741 | Set_Conversion_OK (First (Arg_List)); | |
3742 | Set_Conversion_OK (Next (First (Arg_List))); | |
3743 | ||
3744 | Append_To (Arg_List, | |
3745 | Make_Integer_Literal (Loc, Scale_Value (Ptyp))); | |
3746 | ||
2bf891fa EB |
3747 | -- For ordinary fixed-point types, append Num, Den and Scale |
3748 | -- parameters and also set to do literal conversion | |
8d87bb8f | 3749 | |
ec80b416 | 3750 | elsif Fid /= RE_Fore_Fixed then |
8d87bb8f EB |
3751 | Set_Conversion_OK (First (Arg_List)); |
3752 | Set_Conversion_OK (Next (First (Arg_List))); | |
3753 | ||
3754 | Append_To (Arg_List, | |
3755 | Make_Integer_Literal (Loc, -Norm_Num (Small_Value (Ptyp)))); | |
3756 | ||
3757 | Append_To (Arg_List, | |
3758 | Make_Integer_Literal (Loc, -Norm_Den (Small_Value (Ptyp)))); | |
2bf891fa EB |
3759 | |
3760 | declare | |
3761 | Val : Ureal := Small_Value (Ptyp); | |
3762 | Scale : Int := 0; | |
3763 | ||
3764 | begin | |
3765 | while Val >= Ureal_10 loop | |
3766 | Val := Val / Ureal_10; | |
3767 | Scale := Scale - 1; | |
3768 | end loop; | |
3769 | ||
3770 | Append_To (Arg_List, | |
3771 | Make_Integer_Literal (Loc, UI_From_Int (Scale))); | |
3772 | end; | |
8d87bb8f EB |
3773 | end if; |
3774 | ||
3775 | Rewrite (N, | |
3776 | Convert_To (Typ, | |
3777 | Make_Function_Call (Loc, | |
3778 | Name => | |
3779 | New_Occurrence_Of (RTE (Fid), Loc), | |
3780 | Parameter_Associations => Arg_List))); | |
3781 | ||
3782 | Analyze_And_Resolve (N, Typ); | |
3783 | end; | |
70482933 RK |
3784 | |
3785 | -------------- | |
3786 | -- Fraction -- | |
3787 | -------------- | |
3788 | ||
3789 | -- Transforms 'Fraction into a call to the floating-point attribute | |
3790 | -- function Fraction in Fat_xxx (where xxx is the root type) | |
3791 | ||
3792 | when Attribute_Fraction => | |
3793 | Expand_Fpt_Attribute_R (N); | |
3794 | ||
54838d1f AC |
3795 | -------------- |
3796 | -- From_Any -- | |
3797 | -------------- | |
3798 | ||
3799 | when Attribute_From_Any => From_Any : declare | |
fb8e3581 | 3800 | Decls : constant List_Id := New_List; |
d8f43ee6 | 3801 | |
54838d1f AC |
3802 | begin |
3803 | Rewrite (N, | |
10e168cd | 3804 | Build_From_Any_Call (Ptyp, |
54838d1f AC |
3805 | Relocate_Node (First (Exprs)), |
3806 | Decls)); | |
3807 | Insert_Actions (N, Decls); | |
10e168cd | 3808 | Analyze_And_Resolve (N, Ptyp); |
54838d1f AC |
3809 | end From_Any; |
3810 | ||
ea70f3d0 RD |
3811 | ---------------------- |
3812 | -- Has_Same_Storage -- | |
3813 | ---------------------- | |
3814 | ||
3815 | when Attribute_Has_Same_Storage => Has_Same_Storage : declare | |
d8f43ee6 | 3816 | Loc : constant Source_Ptr := Sloc (N); |
ea70f3d0 | 3817 | |
d8f43ee6 HK |
3818 | X : constant Node_Id := Prefix (N); |
3819 | Y : constant Node_Id := First (Expressions (N)); | |
3820 | -- The arguments | |
ea70f3d0 | 3821 | |
d8f43ee6 HK |
3822 | X_Addr : Node_Id; |
3823 | Y_Addr : Node_Id; | |
3824 | -- Rhe expressions for their addresses | |
ea70f3d0 | 3825 | |
d8f43ee6 HK |
3826 | X_Size : Node_Id; |
3827 | Y_Size : Node_Id; | |
3828 | -- Rhe expressions for their sizes | |
ea70f3d0 RD |
3829 | |
3830 | begin | |
3831 | -- The attribute is expanded as: | |
3832 | ||
3833 | -- (X'address = Y'address) | |
3834 | -- and then (X'Size = Y'Size) | |
36cf595c | 3835 | -- and then (X'Size /= 0) (AI12-0077) |
ea70f3d0 RD |
3836 | |
3837 | -- If both arguments have the same Etype the second conjunct can be | |
3838 | -- omitted. | |
3839 | ||
3840 | X_Addr := | |
3841 | Make_Attribute_Reference (Loc, | |
d8f43ee6 HK |
3842 | Attribute_Name => Name_Address, |
3843 | Prefix => New_Copy_Tree (X)); | |
ea70f3d0 RD |
3844 | |
3845 | Y_Addr := | |
3846 | Make_Attribute_Reference (Loc, | |
d8f43ee6 HK |
3847 | Attribute_Name => Name_Address, |
3848 | Prefix => New_Copy_Tree (Y)); | |
ea70f3d0 RD |
3849 | |
3850 | X_Size := | |
3851 | Make_Attribute_Reference (Loc, | |
d8f43ee6 HK |
3852 | Attribute_Name => Name_Size, |
3853 | Prefix => New_Copy_Tree (X)); | |
ea70f3d0 | 3854 | |
ea70f3d0 RD |
3855 | if Etype (X) = Etype (Y) then |
3856 | Rewrite (N, | |
36cf595c EB |
3857 | Make_And_Then (Loc, |
3858 | Left_Opnd => | |
3859 | Make_Op_Eq (Loc, | |
3860 | Left_Opnd => X_Addr, | |
3861 | Right_Opnd => Y_Addr), | |
3862 | Right_Opnd => | |
3863 | Make_Op_Ne (Loc, | |
3864 | Left_Opnd => X_Size, | |
3865 | Right_Opnd => Make_Integer_Literal (Loc, 0)))); | |
ea70f3d0 | 3866 | else |
36cf595c EB |
3867 | Y_Size := |
3868 | Make_Attribute_Reference (Loc, | |
3869 | Attribute_Name => Name_Size, | |
3870 | Prefix => New_Copy_Tree (Y)); | |
3871 | ||
ea70f3d0 | 3872 | Rewrite (N, |
36cf595c | 3873 | Make_And_Then (Loc, |
d8f43ee6 HK |
3874 | Left_Opnd => |
3875 | Make_Op_Eq (Loc, | |
3876 | Left_Opnd => X_Addr, | |
3877 | Right_Opnd => Y_Addr), | |
3878 | Right_Opnd => | |
36cf595c EB |
3879 | Make_And_Then (Loc, |
3880 | Left_Opnd => | |
3881 | Make_Op_Eq (Loc, | |
3882 | Left_Opnd => X_Size, | |
3883 | Right_Opnd => Y_Size), | |
3884 | Right_Opnd => | |
3885 | Make_Op_Ne (Loc, | |
3886 | Left_Opnd => New_Copy_Tree (X_Size), | |
3887 | Right_Opnd => Make_Integer_Literal (Loc, 0))))); | |
ea70f3d0 RD |
3888 | end if; |
3889 | ||
3890 | Analyze_And_Resolve (N, Standard_Boolean); | |
3891 | end Has_Same_Storage; | |
3892 | ||
70482933 RK |
3893 | -------------- |
3894 | -- Identity -- | |
3895 | -------------- | |
3896 | ||
3897 | -- For an exception returns a reference to the exception data: | |
3898 | -- Exception_Id!(Prefix'Reference) | |
3899 | ||
3900 | -- For a task it returns a reference to the _task_id component of | |
3901 | -- corresponding record: | |
3902 | ||
b5e792e2 | 3903 | -- taskV!(Prefix)._Task_Id, converted to the type Task_Id defined |
70482933 | 3904 | |
758c442c | 3905 | -- in Ada.Task_Identification |
70482933 RK |
3906 | |
3907 | when Attribute_Identity => Identity : declare | |
3908 | Id_Kind : Entity_Id; | |
3909 | ||
3910 | begin | |
21d27997 | 3911 | if Ptyp = Standard_Exception_Type then |
70482933 RK |
3912 | Id_Kind := RTE (RE_Exception_Id); |
3913 | ||
19e7eae5 BD |
3914 | if Present (Renamed_Entity (Entity (Pref))) then |
3915 | Set_Entity (Pref, Renamed_Entity (Entity (Pref))); | |
70482933 RK |
3916 | end if; |
3917 | ||
3918 | Rewrite (N, | |
3919 | Unchecked_Convert_To (Id_Kind, Make_Reference (Loc, Pref))); | |
3920 | else | |
b5e792e2 | 3921 | Id_Kind := RTE (RO_AT_Task_Id); |
70482933 | 3922 | |
470cd9e9 RD |
3923 | -- If the prefix is a task interface, the Task_Id is obtained |
3924 | -- dynamically through a dispatching call, as for other task | |
3925 | -- attributes applied to interfaces. | |
3926 | ||
0791fbe9 | 3927 | if Ada_Version >= Ada_2005 |
21d27997 RD |
3928 | and then Ekind (Ptyp) = E_Class_Wide_Type |
3929 | and then Is_Interface (Ptyp) | |
3930 | and then Is_Task_Interface (Ptyp) | |
470cd9e9 | 3931 | then |
c0e938d0 AC |
3932 | Rewrite (N, |
3933 | Unchecked_Convert_To | |
3934 | (Id_Kind, Build_Disp_Get_Task_Id_Call (Pref))); | |
470cd9e9 RD |
3935 | |
3936 | else | |
3937 | Rewrite (N, | |
3938 | Unchecked_Convert_To (Id_Kind, Concurrent_Ref (Pref))); | |
3939 | end if; | |
70482933 RK |
3940 | end if; |
3941 | ||
3942 | Analyze_And_Resolve (N, Id_Kind); | |
3943 | end Identity; | |
3944 | ||
3945 | ----------- | |
3946 | -- Image -- | |
3947 | ----------- | |
3948 | ||
70482933 | 3949 | when Attribute_Image => |
643827e9 | 3950 | |
b63d61f7 AC |
3951 | -- Leave attribute unexpanded in CodePeer mode: the gnat2scil |
3952 | -- back-end knows how to handle this attribute directly. | |
3953 | ||
3954 | if CodePeer_Mode then | |
3955 | return; | |
3956 | end if; | |
3957 | ||
e0fd1b9c | 3958 | Exp_Imgv.Expand_Image_Attribute (N); |
70482933 RK |
3959 | |
3960 | --------- | |
3961 | -- Img -- | |
3962 | --------- | |
3963 | ||
3964 | -- X'Img is expanded to typ'Image (X), where typ is the type of X | |
3965 | ||
d8f43ee6 | 3966 | when Attribute_Img => |
e0fd1b9c | 3967 | Exp_Imgv.Expand_Image_Attribute (N); |
70482933 | 3968 | |
e577151d PT |
3969 | ----------------- |
3970 | -- Initialized -- | |
3971 | ----------------- | |
3972 | ||
3973 | -- For execution, we could either implement an approximation of this | |
3974 | -- aspect, or use Valid_Scalars as a first approximation. For now we do | |
3975 | -- the latter. | |
3976 | ||
3977 | when Attribute_Initialized => | |
8b6d722d BY |
3978 | |
3979 | -- Do not expand 'Initialized in CodePeer mode, it will be handled | |
3980 | -- by the back-end directly. | |
3981 | ||
3982 | if CodePeer_Mode then | |
3983 | return; | |
3984 | end if; | |
3985 | ||
e577151d PT |
3986 | Rewrite |
3987 | (N, | |
3988 | Make_Attribute_Reference | |
3989 | (Sloc => Loc, | |
3990 | Prefix => Pref, | |
3991 | Attribute_Name => Name_Valid_Scalars, | |
3992 | Expressions => Exprs)); | |
3993 | ||
3994 | Analyze_And_Resolve (N); | |
3995 | ||
70482933 RK |
3996 | ----------- |
3997 | -- Input -- | |
3998 | ----------- | |
3999 | ||
4000 | when Attribute_Input => Input : declare | |
4001 | P_Type : constant Entity_Id := Entity (Pref); | |
4002 | B_Type : constant Entity_Id := Base_Type (P_Type); | |
4003 | U_Type : constant Entity_Id := Underlying_Type (P_Type); | |
4004 | Strm : constant Node_Id := First (Exprs); | |
4005 | Fname : Entity_Id; | |
4006 | Decl : Node_Id; | |
4007 | Call : Node_Id; | |
4008 | Prag : Node_Id; | |
4009 | Arg2 : Node_Id; | |
4010 | Rfunc : Node_Id; | |
4011 | ||
4012 | Cntrl : Node_Id := Empty; | |
4013 | -- Value for controlling argument in call. Always Empty except in | |
4014 | -- the dispatching (class-wide type) case, where it is a reference | |
4015 | -- to the dummy object initialized to the right internal tag. | |
4016 | ||
1c6c6771 ES |
4017 | procedure Freeze_Stream_Subprogram (F : Entity_Id); |
4018 | -- The expansion of the attribute reference may generate a call to | |
4019 | -- a user-defined stream subprogram that is frozen by the call. This | |
4020 | -- can lead to access-before-elaboration problem if the reference | |
4021 | -- appears in an object declaration and the subprogram body has not | |
4022 | -- been seen. The freezing of the subprogram requires special code | |
4023 | -- because it appears in an expanded context where expressions do | |
4024 | -- not freeze their constituents. | |
4025 | ||
4026 | ------------------------------ | |
4027 | -- Freeze_Stream_Subprogram -- | |
4028 | ------------------------------ | |
4029 | ||
4030 | procedure Freeze_Stream_Subprogram (F : Entity_Id) is | |
4031 | Decl : constant Node_Id := Unit_Declaration_Node (F); | |
4032 | Bod : Node_Id; | |
4033 | ||
4034 | begin | |
4035 | -- If this is user-defined subprogram, the corresponding | |
4036 | -- stream function appears as a renaming-as-body, and the | |
4037 | -- user subprogram must be retrieved by tree traversal. | |
4038 | ||
4039 | if Present (Decl) | |
4040 | and then Nkind (Decl) = N_Subprogram_Declaration | |
4041 | and then Present (Corresponding_Body (Decl)) | |
4042 | then | |
4043 | Bod := Corresponding_Body (Decl); | |
4044 | ||
4045 | if Nkind (Unit_Declaration_Node (Bod)) = | |
4046 | N_Subprogram_Renaming_Declaration | |
4047 | then | |
4048 | Set_Is_Frozen (Entity (Name (Unit_Declaration_Node (Bod)))); | |
4049 | end if; | |
4050 | end if; | |
4051 | end Freeze_Stream_Subprogram; | |
4052 | ||
4053 | -- Start of processing for Input | |
4054 | ||
70482933 RK |
4055 | begin |
4056 | -- If no underlying type, we have an error that will be diagnosed | |
4057 | -- elsewhere, so here we just completely ignore the expansion. | |
4058 | ||
4059 | if No (U_Type) then | |
4060 | return; | |
4061 | end if; | |
4062 | ||
baa571ab AC |
4063 | -- Stream operations can appear in user code even if the restriction |
4064 | -- No_Streams is active (for example, when instantiating a predefined | |
4065 | -- container). In that case rewrite the attribute as a Raise to | |
4066 | -- prevent any run-time use. | |
4067 | ||
4068 | if Restriction_Active (No_Streams) then | |
4069 | Rewrite (N, | |
4070 | Make_Raise_Program_Error (Sloc (N), | |
b8b2d982 | 4071 | Reason => PE_Stream_Operation_Not_Allowed)); |
baa571ab AC |
4072 | Set_Etype (N, B_Type); |
4073 | return; | |
4074 | end if; | |
4075 | ||
70482933 RK |
4076 | -- If there is a TSS for Input, just call it |
4077 | ||
fbf5a39b | 4078 | Fname := Find_Stream_Subprogram (P_Type, TSS_Stream_Input); |
70482933 RK |
4079 | |
4080 | if Present (Fname) then | |
4081 | null; | |
4082 | ||
4083 | else | |
4084 | -- If there is a Stream_Convert pragma, use it, we rewrite | |
4085 | ||
4086 | -- sourcetyp'Input (stream) | |
4087 | ||
4088 | -- as | |
4089 | ||
4090 | -- sourcetyp (streamread (strmtyp'Input (stream))); | |
4091 | ||
f3d0f304 | 4092 | -- where streamread is the given Read function that converts an |
21d27997 RD |
4093 | -- argument of type strmtyp to type sourcetyp or a type from which |
4094 | -- it is derived (extra conversion required for the derived case). | |
70482933 | 4095 | |
1d571f3b | 4096 | Prag := Get_Stream_Convert_Pragma (P_Type); |
70482933 RK |
4097 | |
4098 | if Present (Prag) then | |
4099 | Arg2 := Next (First (Pragma_Argument_Associations (Prag))); | |
4100 | Rfunc := Entity (Expression (Arg2)); | |
4101 | ||
4102 | Rewrite (N, | |
4103 | Convert_To (B_Type, | |
4104 | Make_Function_Call (Loc, | |
4105 | Name => New_Occurrence_Of (Rfunc, Loc), | |
4106 | Parameter_Associations => New_List ( | |
4107 | Make_Attribute_Reference (Loc, | |
4108 | Prefix => | |
4109 | New_Occurrence_Of | |
4110 | (Etype (First_Formal (Rfunc)), Loc), | |
4111 | Attribute_Name => Name_Input, | |
4112 | Expressions => Exprs))))); | |
4113 | ||
4114 | Analyze_And_Resolve (N, B_Type); | |
4115 | return; | |
4116 | ||
29f2d76c SB |
4117 | -- Limited types |
4118 | ||
4119 | elsif Default_Streaming_Unavailable (U_Type) then | |
4120 | -- Do the same thing here as is done above in the | |
4121 | -- case where a No_Streams restriction is active. | |
4122 | ||
4123 | Rewrite (N, | |
4124 | Make_Raise_Program_Error (Sloc (N), | |
4125 | Reason => PE_Stream_Operation_Not_Allowed)); | |
4126 | Set_Etype (N, B_Type); | |
4127 | return; | |
4128 | ||
70482933 RK |
4129 | -- Elementary types |
4130 | ||
4131 | elsif Is_Elementary_Type (U_Type) then | |
4132 | ||
4133 | -- A special case arises if we have a defined _Read routine, | |
4134 | -- since in this case we are required to call this routine. | |
4135 | ||
a3fbecee EB |
4136 | if Present (Find_Inherited_TSS (P_Type, TSS_Stream_Read)) then |
4137 | Build_Record_Or_Elementary_Input_Function | |
4138 | (Loc, P_Type, Decl, Fname); | |
4139 | Insert_Action (N, Decl); | |
70482933 | 4140 | |
a3fbecee | 4141 | -- For normal cases, we call the I_xxx routine directly |
70482933 | 4142 | |
a3fbecee EB |
4143 | else |
4144 | Rewrite (N, Build_Elementary_Input_Call (N)); | |
4145 | Analyze_And_Resolve (N, P_Type); | |
4146 | return; | |
4147 | end if; | |
70482933 RK |
4148 | |
4149 | -- Array type case | |
4150 | ||
4151 | elsif Is_Array_Type (U_Type) then | |
4152 | Build_Array_Input_Function (Loc, U_Type, Decl, Fname); | |
fb632ef5 | 4153 | Compile_Stream_Body_In_Scope (N, Decl, U_Type); |
70482933 RK |
4154 | |
4155 | -- Dispatching case with class-wide type | |
4156 | ||
4157 | elsif Is_Class_Wide_Type (P_Type) then | |
4158 | ||
0669bebe GB |
4159 | -- No need to do anything else compiling under restriction |
4160 | -- No_Dispatching_Calls. During the semantic analysis we | |
4161 | -- already notified such violation. | |
4162 | ||
4163 | if Restriction_Active (No_Dispatching_Calls) then | |
4164 | return; | |
4165 | end if; | |
4166 | ||
70482933 RK |
4167 | declare |
4168 | Rtyp : constant Entity_Id := Root_Type (P_Type); | |
6d0289b1 HK |
4169 | |
4170 | Expr : Node_Id; -- call to Descendant_Tag | |
8e28429a | 4171 | Get_Tag : Node_Id; -- expression to read the 'Tag |
70482933 RK |
4172 | |
4173 | begin | |
4174 | -- Read the internal tag (RM 13.13.2(34)) and use it to | |
8e28429a BD |
4175 | -- initialize a dummy tag value. We used to unconditionally |
4176 | -- generate: | |
6a237c45 | 4177 | -- |
c9d70ab1 | 4178 | -- Descendant_Tag (String'Input (Strm), P_Type); |
6a237c45 AC |
4179 | -- |
4180 | -- which turns into a call to String_Input_Blk_IO. However, | |
4181 | -- if the input is malformed, that could try to read an | |
4182 | -- enormous String, causing chaos. So instead we call | |
4183 | -- String_Input_Tag, which does the same thing as | |
4184 | -- String_Input_Blk_IO, except that if the String is | |
4185 | -- absurdly long, it raises an exception. | |
4186 | -- | |
8e28429a BD |
4187 | -- However, if the No_Stream_Optimizations restriction |
4188 | -- is active, we disable this unnecessary attempt at | |
4189 | -- robustness; we really need to read the string | |
4190 | -- character-by-character. | |
4191 | -- | |
c9d70ab1 | 4192 | -- This value is used only to provide a controlling |
758c442c GD |
4193 | -- argument for the eventual _Input call. Descendant_Tag is |
4194 | -- called rather than Internal_Tag to ensure that we have a | |
4195 | -- tag for a type that is descended from the prefix type and | |
4196 | -- declared at the same accessibility level (the exception | |
4197 | -- Tag_Error will be raised otherwise). The level check is | |
4198 | -- required for Ada 2005 because tagged types can be | |
4199 | -- extended in nested scopes (AI-344). | |
70482933 | 4200 | |
c9d70ab1 AC |
4201 | -- Note: we used to generate an explicit declaration of a |
4202 | -- constant Ada.Tags.Tag object, and use an occurrence of | |
4203 | -- this constant in Cntrl, but this caused a secondary stack | |
4204 | -- leak. | |
4205 | ||
8e28429a BD |
4206 | if Restriction_Active (No_Stream_Optimizations) then |
4207 | Get_Tag := | |
4208 | Make_Attribute_Reference (Loc, | |
4209 | Prefix => | |
4210 | New_Occurrence_Of (Standard_String, Loc), | |
4211 | Attribute_Name => Name_Input, | |
4212 | Expressions => New_List ( | |
4213 | Relocate_Node (Duplicate_Subexpr (Strm)))); | |
4214 | else | |
4215 | Get_Tag := | |
4216 | Make_Function_Call (Loc, | |
4217 | Name => | |
4218 | New_Occurrence_Of | |
4219 | (RTE (RE_String_Input_Tag), Loc), | |
4220 | Parameter_Associations => New_List ( | |
4221 | Relocate_Node (Duplicate_Subexpr (Strm)))); | |
4222 | end if; | |
4223 | ||
191fcb3a RD |
4224 | Expr := |
4225 | Make_Function_Call (Loc, | |
e0c23ac7 | 4226 | Name => |
191fcb3a RD |
4227 | New_Occurrence_Of (RTE (RE_Descendant_Tag), Loc), |
4228 | Parameter_Associations => New_List ( | |
8e28429a | 4229 | Get_Tag, |
191fcb3a | 4230 | Make_Attribute_Reference (Loc, |
e0c23ac7 | 4231 | Prefix => New_Occurrence_Of (P_Type, Loc), |
191fcb3a | 4232 | Attribute_Name => Name_Tag))); |
683af98c | 4233 | |
c9d70ab1 | 4234 | Set_Etype (Expr, RTE (RE_Tag)); |
70482933 RK |
4235 | |
4236 | -- Now we need to get the entity for the call, and construct | |
4237 | -- a function call node, where we preset a reference to Dnn | |
758c442c GD |
4238 | -- as the controlling argument (doing an unchecked convert |
4239 | -- to the class-wide tagged type to make it look like a real | |
4240 | -- tagged object). | |
70482933 | 4241 | |
fbf5a39b | 4242 | Fname := Find_Prim_Op (Rtyp, TSS_Stream_Input); |
c9d70ab1 | 4243 | Cntrl := Unchecked_Convert_To (P_Type, Expr); |
fbf5a39b | 4244 | Set_Etype (Cntrl, P_Type); |
70482933 RK |
4245 | Set_Parent (Cntrl, N); |
4246 | end; | |
4247 | ||
4248 | -- For tagged types, use the primitive Input function | |
4249 | ||
4250 | elsif Is_Tagged_Type (U_Type) then | |
fbf5a39b | 4251 | Fname := Find_Prim_Op (U_Type, TSS_Stream_Input); |
70482933 | 4252 | |
758c442c GD |
4253 | -- All other record type cases, including protected records. The |
4254 | -- latter only arise for expander generated code for handling | |
4255 | -- shared passive partition access. | |
70482933 RK |
4256 | |
4257 | else | |
4258 | pragma Assert | |
4259 | (Is_Record_Type (U_Type) or else Is_Protected_Type (U_Type)); | |
4260 | ||
21d27997 RD |
4261 | -- Ada 2005 (AI-216): Program_Error is raised executing default |
4262 | -- implementation of the Input attribute of an unchecked union | |
4263 | -- type if the type lacks default discriminant values. | |
5d09245e AC |
4264 | |
4265 | if Is_Unchecked_Union (Base_Type (U_Type)) | |
d24ef4e6 PT |
4266 | and then |
4267 | No (Discriminant_Default_Value (First_Discriminant (U_Type))) | |
5d09245e | 4268 | then |
d24ef4e6 | 4269 | Rewrite (N, |
5d09245e AC |
4270 | Make_Raise_Program_Error (Loc, |
4271 | Reason => PE_Unchecked_Union_Restriction)); | |
d24ef4e6 | 4272 | Set_Etype (N, B_Type); |
5d09245e AC |
4273 | return; |
4274 | end if; | |
4275 | ||
f2404867 AC |
4276 | -- Build the type's Input function, passing the subtype rather |
4277 | -- than its base type, because checks are needed in the case of | |
4278 | -- constrained discriminants (see Ada 2012 AI05-0192). | |
4279 | ||
70482933 | 4280 | Build_Record_Or_Elementary_Input_Function |
f2404867 | 4281 | (Loc, U_Type, Decl, Fname); |
70482933 | 4282 | Insert_Action (N, Decl); |
1c6c6771 ES |
4283 | |
4284 | if Nkind (Parent (N)) = N_Object_Declaration | |
4285 | and then Is_Record_Type (U_Type) | |
4286 | then | |
4287 | -- The stream function may contain calls to user-defined | |
4288 | -- Read procedures for individual components. | |
4289 | ||
4290 | declare | |
4291 | Comp : Entity_Id; | |
4292 | Func : Entity_Id; | |
4293 | ||
4294 | begin | |
4295 | Comp := First_Component (U_Type); | |
4296 | while Present (Comp) loop | |
4297 | Func := | |
4298 | Find_Stream_Subprogram | |
4299 | (Etype (Comp), TSS_Stream_Read); | |
4300 | ||
4301 | if Present (Func) then | |
4302 | Freeze_Stream_Subprogram (Func); | |
4303 | end if; | |
4304 | ||
4305 | Next_Component (Comp); | |
4306 | end loop; | |
4307 | end; | |
4308 | end if; | |
70482933 RK |
4309 | end if; |
4310 | end if; | |
4311 | ||
758c442c GD |
4312 | -- If we fall through, Fname is the function to be called. The result |
4313 | -- is obtained by calling the appropriate function, then converting | |
4314 | -- the result. The conversion does a subtype check. | |
70482933 RK |
4315 | |
4316 | Call := | |
4317 | Make_Function_Call (Loc, | |
4318 | Name => New_Occurrence_Of (Fname, Loc), | |
4319 | Parameter_Associations => New_List ( | |
4320 | Relocate_Node (Strm))); | |
4321 | ||
4322 | Set_Controlling_Argument (Call, Cntrl); | |
4323 | Rewrite (N, Unchecked_Convert_To (P_Type, Call)); | |
4324 | Analyze_And_Resolve (N, P_Type); | |
1c6c6771 ES |
4325 | |
4326 | if Nkind (Parent (N)) = N_Object_Declaration then | |
4327 | Freeze_Stream_Subprogram (Fname); | |
4328 | end if; | |
70482933 RK |
4329 | end Input; |
4330 | ||
21d27997 RD |
4331 | ------------------- |
4332 | -- Invalid_Value -- | |
4333 | ------------------- | |
4334 | ||
4335 | when Attribute_Invalid_Value => | |
4336 | Rewrite (N, Get_Simple_Init_Val (Ptyp, N)); | |
4337 | ||
68f27c97 HK |
4338 | -- The value produced may be a conversion of a literal, which must be |
4339 | -- resolved to establish its proper type. | |
6a04c943 ES |
4340 | |
4341 | Analyze_And_Resolve (N); | |
4342 | ||
70482933 RK |
4343 | -------------- |
4344 | -- Last_Bit -- | |
4345 | -------------- | |
4346 | ||
12be130c EB |
4347 | -- We leave the computation up to the back end, since we don't know what |
4348 | -- layout will be chosen if no component clause was specified. | |
be482a8c | 4349 | |
12be130c EB |
4350 | when Attribute_Last_Bit => |
4351 | Apply_Universal_Integer_Attribute_Checks (N); | |
70482933 RK |
4352 | |
4353 | ------------------ | |
4354 | -- Leading_Part -- | |
4355 | ------------------ | |
4356 | ||
4357 | -- Transforms 'Leading_Part into a call to the floating-point attribute | |
4358 | -- function Leading_Part in Fat_xxx (where xxx is the root type) | |
4359 | ||
21d27997 | 4360 | -- Note: strictly, we should generate special case code to deal with |
758c442c GD |
4361 | -- absurdly large positive arguments (greater than Integer'Last), which |
4362 | -- result in returning the first argument unchanged, but it hardly seems | |
4363 | -- worth the effort. We raise constraint error for absurdly negative | |
4364 | -- arguments which is fine. | |
70482933 RK |
4365 | |
4366 | when Attribute_Leading_Part => | |
4367 | Expand_Fpt_Attribute_RI (N); | |
4368 | ||
4369 | ------------ | |
4370 | -- Length -- | |
4371 | ------------ | |
4372 | ||
150ac76e | 4373 | when Attribute_Length => Length : declare |
70482933 RK |
4374 | Ityp : Entity_Id; |
4375 | Xnum : Uint; | |
4376 | ||
4377 | begin | |
4378 | -- Processing for packed array types | |
4379 | ||
bfe5f951 | 4380 | if Is_Packed_Array (Ptyp) then |
70482933 RK |
4381 | Ityp := Get_Index_Subtype (N); |
4382 | ||
21d27997 RD |
4383 | -- If the index type, Ityp, is an enumeration type with holes, |
4384 | -- then we calculate X'Length explicitly using | |
70482933 RK |
4385 | |
4386 | -- Typ'Max | |
4387 | -- (0, Ityp'Pos (X'Last (N)) - | |
4388 | -- Ityp'Pos (X'First (N)) + 1); | |
4389 | ||
21d27997 RD |
4390 | -- Since the bounds in the template are the representation values |
4391 | -- and the back end would get the wrong value. | |
70482933 RK |
4392 | |
4393 | if Is_Enumeration_Type (Ityp) | |
4394 | and then Present (Enum_Pos_To_Rep (Base_Type (Ityp))) | |
4395 | then | |
4396 | if No (Exprs) then | |
4397 | Xnum := Uint_1; | |
4398 | else | |
4399 | Xnum := Expr_Value (First (Expressions (N))); | |
4400 | end if; | |
4401 | ||
4402 | Rewrite (N, | |
4403 | Make_Attribute_Reference (Loc, | |
4404 | Prefix => New_Occurrence_Of (Typ, Loc), | |
4405 | Attribute_Name => Name_Max, | |
4406 | Expressions => New_List | |
4407 | (Make_Integer_Literal (Loc, 0), | |
4408 | ||
4409 | Make_Op_Add (Loc, | |
4410 | Left_Opnd => | |
4411 | Make_Op_Subtract (Loc, | |
4412 | Left_Opnd => | |
4413 | Make_Attribute_Reference (Loc, | |
4414 | Prefix => New_Occurrence_Of (Ityp, Loc), | |
4415 | Attribute_Name => Name_Pos, | |
4416 | ||
4417 | Expressions => New_List ( | |
4418 | Make_Attribute_Reference (Loc, | |
4419 | Prefix => Duplicate_Subexpr (Pref), | |
4420 | Attribute_Name => Name_Last, | |
4421 | Expressions => New_List ( | |
4422 | Make_Integer_Literal (Loc, Xnum))))), | |
4423 | ||
4424 | Right_Opnd => | |
4425 | Make_Attribute_Reference (Loc, | |
4426 | Prefix => New_Occurrence_Of (Ityp, Loc), | |
4427 | Attribute_Name => Name_Pos, | |
4428 | ||
4429 | Expressions => New_List ( | |
4430 | Make_Attribute_Reference (Loc, | |
fbf5a39b AC |
4431 | Prefix => |
4432 | Duplicate_Subexpr_No_Checks (Pref), | |
70482933 RK |
4433 | Attribute_Name => Name_First, |
4434 | Expressions => New_List ( | |
4435 | Make_Integer_Literal (Loc, Xnum)))))), | |
4436 | ||
4437 | Right_Opnd => Make_Integer_Literal (Loc, 1))))); | |
4438 | ||
4439 | Analyze_And_Resolve (N, Typ, Suppress => All_Checks); | |
4440 | return; | |
4441 | ||
4442 | -- If the prefix type is a constrained packed array type which | |
8ca597af RD |
4443 | -- already has a Packed_Array_Impl_Type representation defined, |
4444 | -- then replace this attribute with a reference to 'Range_Length | |
4445 | -- of the appropriate index subtype (since otherwise the | |
4446 | -- back end will try to give us the value of 'Length for | |
4447 | -- this implementation type).s | |
70482933 RK |
4448 | |
4449 | elsif Is_Constrained (Ptyp) then | |
4450 | Rewrite (N, | |
4451 | Make_Attribute_Reference (Loc, | |
4452 | Attribute_Name => Name_Range_Length, | |
e4494292 | 4453 | Prefix => New_Occurrence_Of (Ityp, Loc))); |
70482933 RK |
4454 | Analyze_And_Resolve (N, Typ); |
4455 | end if; | |
4456 | ||
70482933 RK |
4457 | -- Access type case |
4458 | ||
4459 | elsif Is_Access_Type (Ptyp) then | |
4460 | Apply_Access_Check (N); | |
4461 | ||
21d27997 RD |
4462 | -- If the designated type is a packed array type, then we convert |
4463 | -- the reference to: | |
70482933 RK |
4464 | |
4465 | -- typ'Max (0, 1 + | |
4466 | -- xtyp'Pos (Pref'Last (Expr)) - | |
4467 | -- xtyp'Pos (Pref'First (Expr))); | |
4468 | ||
21d27997 RD |
4469 | -- This is a bit complex, but it is the easiest thing to do that |
4470 | -- works in all cases including enum types with holes xtyp here | |
4471 | -- is the appropriate index type. | |
70482933 RK |
4472 | |
4473 | declare | |
4474 | Dtyp : constant Entity_Id := Designated_Type (Ptyp); | |
4475 | Xtyp : Entity_Id; | |
4476 | ||
4477 | begin | |
bfe5f951 | 4478 | if Is_Packed_Array (Dtyp) then |
70482933 RK |
4479 | Xtyp := Get_Index_Subtype (N); |
4480 | ||
4481 | Rewrite (N, | |
4482 | Make_Attribute_Reference (Loc, | |
4483 | Prefix => New_Occurrence_Of (Typ, Loc), | |
4484 | Attribute_Name => Name_Max, | |
4485 | Expressions => New_List ( | |
4486 | Make_Integer_Literal (Loc, 0), | |
4487 | ||
4488 | Make_Op_Add (Loc, | |
4489 | Make_Integer_Literal (Loc, 1), | |
4490 | Make_Op_Subtract (Loc, | |
4491 | Left_Opnd => | |
4492 | Make_Attribute_Reference (Loc, | |
4493 | Prefix => New_Occurrence_Of (Xtyp, Loc), | |
4494 | Attribute_Name => Name_Pos, | |
4495 | Expressions => New_List ( | |
4496 | Make_Attribute_Reference (Loc, | |
4497 | Prefix => Duplicate_Subexpr (Pref), | |
4498 | Attribute_Name => Name_Last, | |
4499 | Expressions => | |
4500 | New_Copy_List (Exprs)))), | |
4501 | ||
4502 | Right_Opnd => | |
4503 | Make_Attribute_Reference (Loc, | |
4504 | Prefix => New_Occurrence_Of (Xtyp, Loc), | |
4505 | Attribute_Name => Name_Pos, | |
4506 | Expressions => New_List ( | |
4507 | Make_Attribute_Reference (Loc, | |
fbf5a39b AC |
4508 | Prefix => |
4509 | Duplicate_Subexpr_No_Checks (Pref), | |
70482933 RK |
4510 | Attribute_Name => Name_First, |
4511 | Expressions => | |
4512 | New_Copy_List (Exprs))))))))); | |
4513 | ||
4514 | Analyze_And_Resolve (N, Typ); | |
4515 | end if; | |
4516 | end; | |
4517 | ||
21d27997 | 4518 | -- Otherwise leave it to the back end |
70482933 RK |
4519 | |
4520 | else | |
4521 | Apply_Universal_Integer_Attribute_Checks (N); | |
4522 | end if; | |
150ac76e AC |
4523 | end Length; |
4524 | ||
d436b30d AC |
4525 | -- Attribute Loop_Entry is replaced with a reference to a constant value |
4526 | -- which captures the prefix at the entry point of the related loop. The | |
4527 | -- loop itself may be transformed into a conditional block. | |
150ac76e AC |
4528 | |
4529 | when Attribute_Loop_Entry => | |
d436b30d | 4530 | Expand_Loop_Entry_Attribute (N); |
70482933 RK |
4531 | |
4532 | ------------- | |
4533 | -- Machine -- | |
4534 | ------------- | |
4535 | ||
4536 | -- Transforms 'Machine into a call to the floating-point attribute | |
24228312 AC |
4537 | -- function Machine in Fat_xxx (where xxx is the root type). |
4538 | -- Expansion is avoided for cases the back end can handle directly. | |
70482933 RK |
4539 | |
4540 | when Attribute_Machine => | |
24228312 AC |
4541 | if not Is_Inline_Floating_Point_Attribute (N) then |
4542 | Expand_Fpt_Attribute_R (N); | |
4543 | end if; | |
70482933 | 4544 | |
65f01153 RD |
4545 | ---------------------- |
4546 | -- Machine_Rounding -- | |
4547 | ---------------------- | |
4548 | ||
4549 | -- Transforms 'Machine_Rounding into a call to the floating-point | |
4550 | -- attribute function Machine_Rounding in Fat_xxx (where xxx is the root | |
0669bebe GB |
4551 | -- type). Expansion is avoided for cases the back end can handle |
4552 | -- directly. | |
65f01153 RD |
4553 | |
4554 | when Attribute_Machine_Rounding => | |
0669bebe GB |
4555 | if not Is_Inline_Floating_Point_Attribute (N) then |
4556 | Expand_Fpt_Attribute_R (N); | |
4557 | end if; | |
65f01153 | 4558 | |
70482933 RK |
4559 | ------------------ |
4560 | -- Machine_Size -- | |
4561 | ------------------ | |
4562 | ||
4563 | -- Machine_Size is equivalent to Object_Size, so transform it into | |
21d27997 | 4564 | -- Object_Size and that way the back end never sees Machine_Size. |
70482933 RK |
4565 | |
4566 | when Attribute_Machine_Size => | |
4567 | Rewrite (N, | |
4568 | Make_Attribute_Reference (Loc, | |
4569 | Prefix => Prefix (N), | |
4570 | Attribute_Name => Name_Object_Size)); | |
4571 | ||
4572 | Analyze_And_Resolve (N, Typ); | |
4573 | ||
4574 | -------------- | |
4575 | -- Mantissa -- | |
4576 | -------------- | |
4577 | ||
758c442c | 4578 | -- The only case that can get this far is the dynamic case of the old |
21d27997 RD |
4579 | -- Ada 83 Mantissa attribute for the fixed-point case. For this case, |
4580 | -- we expand: | |
70482933 RK |
4581 | |
4582 | -- typ'Mantissa | |
4583 | ||
4584 | -- into | |
4585 | ||
4586 | -- ityp (System.Mantissa.Mantissa_Value | |
4587 | -- (Integer'Integer_Value (typ'First), | |
4588 | -- Integer'Integer_Value (typ'Last))); | |
4589 | ||
d8f43ee6 | 4590 | when Attribute_Mantissa => |
70482933 RK |
4591 | Rewrite (N, |
4592 | Convert_To (Typ, | |
4593 | Make_Function_Call (Loc, | |
d8f43ee6 HK |
4594 | Name => |
4595 | New_Occurrence_Of (RTE (RE_Mantissa_Value), Loc), | |
70482933 RK |
4596 | |
4597 | Parameter_Associations => New_List ( | |
70482933 | 4598 | Make_Attribute_Reference (Loc, |
d8f43ee6 | 4599 | Prefix => New_Occurrence_Of (Standard_Integer, Loc), |
70482933 | 4600 | Attribute_Name => Name_Integer_Value, |
d8f43ee6 | 4601 | Expressions => New_List ( |
70482933 | 4602 | Make_Attribute_Reference (Loc, |
d8f43ee6 | 4603 | Prefix => New_Occurrence_Of (Ptyp, Loc), |
70482933 RK |
4604 | Attribute_Name => Name_First))), |
4605 | ||
4606 | Make_Attribute_Reference (Loc, | |
d8f43ee6 | 4607 | Prefix => New_Occurrence_Of (Standard_Integer, Loc), |
70482933 | 4608 | Attribute_Name => Name_Integer_Value, |
d8f43ee6 | 4609 | Expressions => New_List ( |
70482933 | 4610 | Make_Attribute_Reference (Loc, |
d8f43ee6 | 4611 | Prefix => New_Occurrence_Of (Ptyp, Loc), |
70482933 RK |
4612 | Attribute_Name => Name_Last))))))); |
4613 | ||
4614 | Analyze_And_Resolve (N, Typ); | |
70482933 | 4615 | |
aa9b151a AC |
4616 | --------- |
4617 | -- Max -- | |
4618 | --------- | |
4619 | ||
4620 | when Attribute_Max => | |
e0f63680 | 4621 | Expand_Min_Max_Attribute (N); |
aa9b151a | 4622 | |
ca20a08e AC |
4623 | ---------------------------------- |
4624 | -- Max_Size_In_Storage_Elements -- | |
4625 | ---------------------------------- | |
4626 | ||
24cb156d | 4627 | when Attribute_Max_Size_In_Storage_Elements => declare |
2e8ee0a3 | 4628 | Typ : constant Entity_Id := Etype (N); |
24cb156d AC |
4629 | |
4630 | begin | |
d85badc7 BD |
4631 | -- If the prefix is X'Class, we transform it into a direct reference |
4632 | -- to the class-wide type, because the back end must not see a 'Class | |
4633 | -- reference. See also 'Size. | |
4634 | ||
4635 | if Is_Entity_Name (Pref) | |
4636 | and then Is_Class_Wide_Type (Entity (Pref)) | |
4637 | then | |
4638 | Rewrite (Prefix (N), New_Occurrence_Of (Entity (Pref), Loc)); | |
4639 | return; | |
4640 | end if; | |
4641 | ||
ca20a08e AC |
4642 | -- Heap-allocated controlled objects contain two extra pointers which |
4643 | -- are not part of the actual type. Transform the attribute reference | |
4644 | -- into a runtime expression to add the size of the hidden header. | |
4645 | ||
2e8ee0a3 EB |
4646 | if Needs_Finalization (Ptyp) and then not Header_Size_Added (N) then |
4647 | Set_Header_Size_Added (N); | |
10e168cd | 4648 | |
ca20a08e AC |
4649 | -- Generate: |
4650 | -- P'Max_Size_In_Storage_Elements + | |
2e8ee0a3 | 4651 | -- Typ (Header_Size_With_Padding (Ptyp'Alignment)) |
ca20a08e | 4652 | |
2e8ee0a3 | 4653 | Rewrite (N, |
ca20a08e | 4654 | Make_Op_Add (Loc, |
2e8ee0a3 | 4655 | Left_Opnd => Relocate_Node (N), |
ca20a08e | 4656 | Right_Opnd => |
2e8ee0a3 | 4657 | Convert_To (Typ, |
ca20a08e AC |
4658 | Make_Function_Call (Loc, |
4659 | Name => | |
e4494292 | 4660 | New_Occurrence_Of |
ca20a08e AC |
4661 | (RTE (RE_Header_Size_With_Padding), Loc), |
4662 | ||
4663 | Parameter_Associations => New_List ( | |
4664 | Make_Attribute_Reference (Loc, | |
4665 | Prefix => | |
e4494292 | 4666 | New_Occurrence_Of (Ptyp, Loc), |
ca20a08e AC |
4667 | Attribute_Name => Name_Alignment)))))); |
4668 | ||
2e8ee0a3 | 4669 | Analyze_And_Resolve (N, Typ); |
ca20a08e AC |
4670 | return; |
4671 | end if; | |
2e8ee0a3 EB |
4672 | |
4673 | -- In the other cases apply the required checks | |
4674 | ||
4675 | Apply_Universal_Integer_Attribute_Checks (N); | |
24cb156d | 4676 | end; |
ca20a08e | 4677 | |
80d4224f RD |
4678 | -------------------- |
4679 | -- Mechanism_Code -- | |
4680 | -------------------- | |
4681 | ||
4682 | when Attribute_Mechanism_Code => | |
4683 | ||
d8f43ee6 | 4684 | -- We must replace the prefix in the renamed case |
80d4224f RD |
4685 | |
4686 | if Is_Entity_Name (Pref) | |
4687 | and then Present (Alias (Entity (Pref))) | |
4688 | then | |
4689 | Set_Renamed_Subprogram (Pref, Alias (Entity (Pref))); | |
4690 | end if; | |
4691 | ||
aa9b151a AC |
4692 | --------- |
4693 | -- Min -- | |
4694 | --------- | |
4695 | ||
4696 | when Attribute_Min => | |
e0f63680 | 4697 | Expand_Min_Max_Attribute (N); |
aa9b151a | 4698 | |
5f3ab6fb AC |
4699 | --------- |
4700 | -- Mod -- | |
4701 | --------- | |
4702 | ||
4703 | when Attribute_Mod => Mod_Case : declare | |
4704 | Arg : constant Node_Id := Relocate_Node (First (Exprs)); | |
779bf182 | 4705 | Hi : constant Node_Id := Type_High_Bound (Base_Type (Etype (Arg))); |
5f3ab6fb AC |
4706 | Modv : constant Uint := Modulus (Btyp); |
4707 | ||
4708 | begin | |
4709 | ||
4710 | -- This is not so simple. The issue is what type to use for the | |
779bf182 ES |
4711 | -- computation of the modular value. In addition we need to use |
4712 | -- the base type as above to retrieve a static bound for the | |
4713 | -- comparisons that follow. | |
5f3ab6fb AC |
4714 | |
4715 | -- The easy case is when the modulus value is within the bounds | |
4716 | -- of the signed integer type of the argument. In this case we can | |
4717 | -- just do the computation in that signed integer type, and then | |
4718 | -- do an ordinary conversion to the target type. | |
4719 | ||
4720 | if Modv <= Expr_Value (Hi) then | |
4721 | Rewrite (N, | |
4722 | Convert_To (Btyp, | |
4723 | Make_Op_Mod (Loc, | |
4724 | Left_Opnd => Arg, | |
4725 | Right_Opnd => Make_Integer_Literal (Loc, Modv)))); | |
4726 | ||
4727 | -- Here we know that the modulus is larger than type'Last of the | |
3b641023 | 4728 | -- integer type. There are two cases to consider: |
5f3ab6fb AC |
4729 | |
4730 | -- a) The integer value is non-negative. In this case, it is | |
4731 | -- returned as the result (since it is less than the modulus). | |
4732 | ||
758c442c GD |
4733 | -- b) The integer value is negative. In this case, we know that the |
4734 | -- result is modulus + value, where the value might be as small as | |
4735 | -- -modulus. The trouble is what type do we use to do the subtract. | |
a5476382 | 4736 | -- No type will do, since modulus can be as big as 2**128, and no |
f3d0f304 | 4737 | -- integer type accommodates this value. Let's do bit of algebra |
5f3ab6fb AC |
4738 | |
4739 | -- modulus + value | |
4740 | -- = modulus - (-value) | |
4741 | -- = (modulus - 1) - (-value - 1) | |
4742 | ||
4743 | -- Now modulus - 1 is certainly in range of the modular type. | |
4744 | -- -value is in the range 1 .. modulus, so -value -1 is in the | |
4745 | -- range 0 .. modulus-1 which is in range of the modular type. | |
4746 | -- Furthermore, (-value - 1) can be expressed as -(value + 1) | |
4747 | -- which we can compute using the integer base type. | |
4748 | ||
9b16cb57 RD |
4749 | -- Once this is done we analyze the if expression without range |
4750 | -- checks, because we know everything is in range, and we want | |
4751 | -- to prevent spurious warnings on either branch. | |
3b641023 | 4752 | |
5f3ab6fb AC |
4753 | else |
4754 | Rewrite (N, | |
9b16cb57 | 4755 | Make_If_Expression (Loc, |
5f3ab6fb AC |
4756 | Expressions => New_List ( |
4757 | Make_Op_Ge (Loc, | |
4758 | Left_Opnd => Duplicate_Subexpr (Arg), | |
4759 | Right_Opnd => Make_Integer_Literal (Loc, 0)), | |
4760 | ||
4761 | Convert_To (Btyp, | |
4762 | Duplicate_Subexpr_No_Checks (Arg)), | |
4763 | ||
4764 | Make_Op_Subtract (Loc, | |
4765 | Left_Opnd => | |
4766 | Make_Integer_Literal (Loc, | |
4767 | Intval => Modv - 1), | |
4768 | Right_Opnd => | |
4769 | Convert_To (Btyp, | |
4770 | Make_Op_Minus (Loc, | |
4771 | Right_Opnd => | |
4772 | Make_Op_Add (Loc, | |
4773 | Left_Opnd => Duplicate_Subexpr_No_Checks (Arg), | |
4774 | Right_Opnd => | |
4775 | Make_Integer_Literal (Loc, | |
4776 | Intval => 1)))))))); | |
4777 | ||
5f3ab6fb AC |
4778 | end if; |
4779 | ||
65f01153 | 4780 | Analyze_And_Resolve (N, Btyp, Suppress => All_Checks); |
5f3ab6fb AC |
4781 | end Mod_Case; |
4782 | ||
70482933 RK |
4783 | ----------- |
4784 | -- Model -- | |
4785 | ----------- | |
4786 | ||
4787 | -- Transforms 'Model into a call to the floating-point attribute | |
24228312 AC |
4788 | -- function Model in Fat_xxx (where xxx is the root type). |
4789 | -- Expansion is avoided for cases the back end can handle directly. | |
70482933 RK |
4790 | |
4791 | when Attribute_Model => | |
24228312 AC |
4792 | if not Is_Inline_Floating_Point_Attribute (N) then |
4793 | Expand_Fpt_Attribute_R (N); | |
4794 | end if; | |
70482933 RK |
4795 | |
4796 | ----------------- | |
4797 | -- Object_Size -- | |
4798 | ----------------- | |
4799 | ||
4800 | -- The processing for Object_Size shares the processing for Size | |
4801 | ||
e10dab7f JM |
4802 | --------- |
4803 | -- Old -- | |
4804 | --------- | |
4805 | ||
4806 | when Attribute_Old => Old : declare | |
6c802906 AC |
4807 | Typ : constant Entity_Id := Etype (N); |
4808 | CW_Temp : Entity_Id; | |
4809 | CW_Typ : Entity_Id; | |
d48bb126 | 4810 | Decl : Node_Id; |
64f5d139 | 4811 | Ins_Nod : Node_Id; |
8e1e62e3 AC |
4812 | Subp : Node_Id; |
4813 | Temp : Entity_Id; | |
e10dab7f | 4814 | |
4c5e9870 SB |
4815 | use Old_Attr_Util.Conditional_Evaluation; |
4816 | use Old_Attr_Util.Indirect_Temps; | |
e10dab7f | 4817 | begin |
64f5d139 JM |
4818 | -- Generating C code we don't need to expand this attribute when |
4819 | -- we are analyzing the internally built nested postconditions | |
4820 | -- procedure since it will be expanded inline (and later it will | |
4821 | -- be removed by Expand_N_Subprogram_Body). It this expansion is | |
4822 | -- performed in such case then the compiler generates unreferenced | |
4823 | -- extra temporaries. | |
4824 | ||
4825 | if Modify_Tree_For_C | |
4826 | and then Chars (Current_Scope) = Name_uPostconditions | |
4827 | then | |
4828 | return; | |
4829 | end if; | |
4830 | ||
8e1e62e3 | 4831 | -- Climb the parent chain looking for subprogram _Postconditions |
21d27997 | 4832 | |
e10dab7f | 4833 | Subp := N; |
8e1e62e3 | 4834 | while Present (Subp) loop |
21d27997 | 4835 | exit when Nkind (Subp) = N_Subprogram_Body |
8e1e62e3 AC |
4836 | and then Chars (Defining_Entity (Subp)) = Name_uPostconditions; |
4837 | ||
4de10025 AC |
4838 | -- If assertions are disabled, no need to create the declaration |
4839 | -- that preserves the value. The postcondition pragma in which | |
4840 | -- 'Old appears will be checked or disabled according to the | |
4841 | -- current policy in effect. | |
4842 | ||
890f1954 | 4843 | if Nkind (Subp) = N_Pragma and then not Is_Checked (Subp) then |
4de10025 AC |
4844 | return; |
4845 | end if; | |
4846 | ||
8e1e62e3 | 4847 | Subp := Parent (Subp); |
e10dab7f JM |
4848 | end loop; |
4849 | ||
8e1e62e3 | 4850 | -- 'Old can only appear in a postcondition, the generated body of |
64f5d139 JM |
4851 | -- _Postconditions must be in the tree (or inlined if we are |
4852 | -- generating C code). | |
8e1e62e3 | 4853 | |
fb757f7d AC |
4854 | pragma Assert |
4855 | (Present (Subp) | |
4856 | or else (Modify_Tree_For_C and then In_Inlined_Body)); | |
8e1e62e3 | 4857 | |
6c802906 | 4858 | Temp := Make_Temporary (Loc, 'T', Pref); |
21d27997 | 4859 | |
6c802906 AC |
4860 | -- Set the entity kind now in order to mark the temporary as a |
4861 | -- handler of attribute 'Old's prefix. | |
4862 | ||
2e02ab86 | 4863 | Mutate_Ekind (Temp, E_Constant); |
6c802906 | 4864 | Set_Stores_Attribute_Old_Prefix (Temp); |
e10dab7f | 4865 | |
8e1e62e3 AC |
4866 | -- Push the scope of the related subprogram where _Postcondition |
4867 | -- resides as this ensures that the object will be analyzed in the | |
4868 | -- proper context. | |
7425962b | 4869 | |
64f5d139 JM |
4870 | if Present (Subp) then |
4871 | Push_Scope (Scope (Defining_Entity (Subp))); | |
4872 | ||
4873 | -- No need to push the scope when generating C code since the | |
4874 | -- _Postcondition procedure has been inlined. | |
4875 | ||
4876 | else pragma Assert (Modify_Tree_For_C); | |
4877 | pragma Assert (In_Inlined_Body); | |
4878 | null; | |
4879 | end if; | |
4880 | ||
4881 | -- Locate the insertion place of the internal temporary that saves | |
4882 | -- the 'Old value. | |
4883 | ||
4884 | if Present (Subp) then | |
4885 | Ins_Nod := Subp; | |
4886 | ||
4887 | -- Generating C, the postcondition procedure has been inlined and the | |
4888 | -- temporary is added before the first declaration of the enclosing | |
4889 | -- subprogram. | |
4890 | ||
4891 | else pragma Assert (Modify_Tree_For_C); | |
4892 | Ins_Nod := N; | |
4893 | while Nkind (Ins_Nod) /= N_Subprogram_Body loop | |
4894 | Ins_Nod := Parent (Ins_Nod); | |
4895 | end loop; | |
4896 | ||
4897 | Ins_Nod := First (Declarations (Ins_Nod)); | |
4898 | end if; | |
7425962b | 4899 | |
4c5e9870 SB |
4900 | if Eligible_For_Conditional_Evaluation (N) then |
4901 | declare | |
4902 | Eval_Stmts : constant List_Id := New_List; | |
4903 | ||
4904 | procedure Append_For_Indirect_Temp | |
4905 | (N : Node_Id; Is_Eval_Stmt : Boolean); | |
4906 | -- Append either a declaration (which is to be elaborated | |
4907 | -- unconditionally) or an evaluation statement (which is | |
4908 | -- to be executed conditionally). | |
4909 | ||
4910 | ------------------------------- | |
4911 | -- Append_For_Indirect_Temp -- | |
4912 | ------------------------------- | |
4913 | ||
4914 | procedure Append_For_Indirect_Temp | |
4915 | (N : Node_Id; Is_Eval_Stmt : Boolean) | |
4916 | is | |
4917 | begin | |
4918 | if Is_Eval_Stmt then | |
4919 | Append_To (Eval_Stmts, N); | |
4920 | else | |
4921 | Insert_Before_And_Analyze (Ins_Nod, N); | |
4922 | end if; | |
4923 | end Append_For_Indirect_Temp; | |
4924 | ||
4925 | procedure Declare_Indirect_Temporary is new | |
4926 | Declare_Indirect_Temp | |
4927 | (Append_Item => Append_For_Indirect_Temp); | |
4928 | begin | |
4929 | Declare_Indirect_Temporary | |
4930 | (Attr_Prefix => Pref, Indirect_Temp => Temp); | |
4931 | ||
4932 | Insert_Before_And_Analyze ( | |
4933 | Ins_Nod, | |
4934 | Make_If_Statement | |
4935 | (Sloc => Loc, | |
4936 | Condition => Conditional_Evaluation_Condition (N), | |
4937 | Then_Statements => Eval_Stmts)); | |
4938 | ||
4939 | Rewrite (N, Indirect_Temp_Value | |
4940 | (Temp => Temp, | |
4941 | Typ => Etype (Pref), | |
4942 | Loc => Loc)); | |
4943 | ||
4944 | if Present (Subp) then | |
4945 | Pop_Scope; | |
4946 | end if; | |
4947 | return; | |
4948 | end; | |
4949 | ||
6c802906 AC |
4950 | -- Preserve the tag of the prefix by offering a specific view of the |
4951 | -- class-wide version of the prefix. | |
4952 | ||
4c5e9870 | 4953 | elsif Is_Tagged_Type (Typ) then |
6c802906 AC |
4954 | |
4955 | -- Generate: | |
4956 | -- CW_Temp : constant Typ'Class := Typ'Class (Pref); | |
4957 | ||
4958 | CW_Temp := Make_Temporary (Loc, 'T'); | |
4959 | CW_Typ := Class_Wide_Type (Typ); | |
4960 | ||
d48bb126 | 4961 | Decl := |
6c802906 AC |
4962 | Make_Object_Declaration (Loc, |
4963 | Defining_Identifier => CW_Temp, | |
4964 | Constant_Present => True, | |
4965 | Object_Definition => New_Occurrence_Of (CW_Typ, Loc), | |
4966 | Expression => | |
d48bb126 PT |
4967 | Convert_To (CW_Typ, Relocate_Node (Pref))); |
4968 | ||
4969 | Insert_Before_And_Analyze (Ins_Nod, Decl); | |
6c802906 AC |
4970 | |
4971 | -- Generate: | |
4972 | -- Temp : Typ renames Typ (CW_Temp); | |
4973 | ||
64f5d139 | 4974 | Insert_Before_And_Analyze (Ins_Nod, |
6c802906 AC |
4975 | Make_Object_Renaming_Declaration (Loc, |
4976 | Defining_Identifier => Temp, | |
4977 | Subtype_Mark => New_Occurrence_Of (Typ, Loc), | |
4978 | Name => | |
4979 | Convert_To (Typ, New_Occurrence_Of (CW_Temp, Loc)))); | |
4980 | ||
c0ffadd6 JS |
4981 | Set_Stores_Attribute_Old_Prefix (CW_Temp); |
4982 | ||
6c802906 AC |
4983 | -- Non-tagged case |
4984 | ||
4985 | else | |
4986 | -- Generate: | |
4987 | -- Temp : constant Typ := Pref; | |
4988 | ||
d48bb126 | 4989 | Decl := |
6c802906 AC |
4990 | Make_Object_Declaration (Loc, |
4991 | Defining_Identifier => Temp, | |
4992 | Constant_Present => True, | |
4993 | Object_Definition => New_Occurrence_Of (Typ, Loc), | |
d48bb126 PT |
4994 | Expression => Relocate_Node (Pref)); |
4995 | ||
4996 | Insert_Before_And_Analyze (Ins_Nod, Decl); | |
4997 | ||
6c802906 | 4998 | end if; |
8e1e62e3 | 4999 | |
64f5d139 JM |
5000 | if Present (Subp) then |
5001 | Pop_Scope; | |
5002 | end if; | |
e10dab7f | 5003 | |
2838fa93 AC |
5004 | -- Ensure that the prefix of attribute 'Old is valid. The check must |
5005 | -- be inserted after the expansion of the attribute has taken place | |
5006 | -- to reflect the new placement of the prefix. | |
5007 | ||
5008 | if Validity_Checks_On and then Validity_Check_Operands then | |
d48bb126 | 5009 | Ensure_Valid (Expression (Decl)); |
2838fa93 AC |
5010 | end if; |
5011 | ||
8e1e62e3 | 5012 | Rewrite (N, New_Occurrence_Of (Temp, Loc)); |
e10dab7f JM |
5013 | end Old; |
5014 | ||
2d42e881 ES |
5015 | ---------------------- |
5016 | -- Overlaps_Storage -- | |
5017 | ---------------------- | |
5018 | ||
5019 | when Attribute_Overlaps_Storage => Overlaps_Storage : declare | |
5020 | Loc : constant Source_Ptr := Sloc (N); | |
d4fd4637 JS |
5021 | X : constant Node_Id := Prefix (N); |
5022 | Y : constant Node_Id := First (Expressions (N)); | |
2d42e881 | 5023 | |
90b510e4 | 5024 | -- The arguments |
2d42e881 ES |
5025 | |
5026 | X_Addr, Y_Addr : Node_Id; | |
d4fd4637 JS |
5027 | |
5028 | -- The expressions for their integer addresses | |
2d42e881 ES |
5029 | |
5030 | X_Size, Y_Size : Node_Id; | |
d4fd4637 JS |
5031 | |
5032 | -- The expressions for their sizes | |
2d42e881 ES |
5033 | |
5034 | Cond : Node_Id; | |
5035 | ||
5036 | begin | |
5037 | -- Attribute expands into: | |
5038 | ||
d4fd4637 JS |
5039 | -- (if X'Size = 0 or else Y'Size = 0 then |
5040 | -- False | |
5041 | -- else | |
5042 | -- (if X'Address <= Y'Address then | |
5043 | -- (X'Address + X'Size - 1) >= Y'Address | |
5044 | -- else | |
5045 | -- (Y'Address + Y'Size - 1) >= X'Address)) | |
2d42e881 ES |
5046 | |
5047 | -- with the proper address operations. We convert addresses to | |
5048 | -- integer addresses to use predefined arithmetic. The size is | |
90b510e4 AC |
5049 | -- expressed in storage units. We add copies of X_Addr and Y_Addr |
5050 | -- to prevent the appearance of the same node in two places in | |
5051 | -- the tree. | |
2d42e881 ES |
5052 | |
5053 | X_Addr := | |
5054 | Unchecked_Convert_To (RTE (RE_Integer_Address), | |
5055 | Make_Attribute_Reference (Loc, | |
5056 | Attribute_Name => Name_Address, | |
5057 | Prefix => New_Copy_Tree (X))); | |
5058 | ||
5059 | Y_Addr := | |
5060 | Unchecked_Convert_To (RTE (RE_Integer_Address), | |
5061 | Make_Attribute_Reference (Loc, | |
5062 | Attribute_Name => Name_Address, | |
5063 | Prefix => New_Copy_Tree (Y))); | |
5064 | ||
5065 | X_Size := | |
5066 | Make_Op_Divide (Loc, | |
5067 | Left_Opnd => | |
5068 | Make_Attribute_Reference (Loc, | |
5069 | Attribute_Name => Name_Size, | |
5070 | Prefix => New_Copy_Tree (X)), | |
5071 | Right_Opnd => | |
5072 | Make_Integer_Literal (Loc, System_Storage_Unit)); | |
5073 | ||
5074 | Y_Size := | |
5075 | Make_Op_Divide (Loc, | |
5076 | Left_Opnd => | |
5077 | Make_Attribute_Reference (Loc, | |
5078 | Attribute_Name => Name_Size, | |
5079 | Prefix => New_Copy_Tree (Y)), | |
5080 | Right_Opnd => | |
5081 | Make_Integer_Literal (Loc, System_Storage_Unit)); | |
5082 | ||
5083 | Cond := | |
5084 | Make_Op_Le (Loc, | |
5085 | Left_Opnd => X_Addr, | |
5086 | Right_Opnd => Y_Addr); | |
5087 | ||
d4fd4637 JS |
5088 | -- Perform the rewriting |
5089 | ||
2d42e881 | 5090 | Rewrite (N, |
9ba9f4c0 | 5091 | Make_If_Expression (Loc, New_List ( |
d4fd4637 | 5092 | |
c392a001 | 5093 | -- Generate a check for zero-sized things like a null record with |
d4fd4637 JS |
5094 | -- size zero or an array with zero length since they have no |
5095 | -- opportunity of overlapping. | |
5096 | ||
c392a001 GD |
5097 | -- Without this check, a zero-sized object can trigger a false |
5098 | -- runtime result if it's compared against another object in | |
5099 | -- its declarative region, due to the zero-sized object having | |
d4fd4637 JS |
5100 | -- the same address. |
5101 | ||
5102 | Make_Or_Else (Loc, | |
9ba9f4c0 | 5103 | Left_Opnd => |
d4fd4637 JS |
5104 | Make_Op_Eq (Loc, |
5105 | Left_Opnd => | |
5106 | Make_Attribute_Reference (Loc, | |
5107 | Attribute_Name => Name_Size, | |
5108 | Prefix => New_Copy_Tree (X)), | |
5109 | Right_Opnd => Make_Integer_Literal (Loc, 0)), | |
5110 | Right_Opnd => | |
5111 | Make_Op_Eq (Loc, | |
5112 | Left_Opnd => | |
5113 | Make_Attribute_Reference (Loc, | |
5114 | Attribute_Name => Name_Size, | |
5115 | Prefix => New_Copy_Tree (Y)), | |
5116 | Right_Opnd => Make_Integer_Literal (Loc, 0))), | |
5117 | ||
5118 | New_Occurrence_Of (Standard_False, Loc), | |
5119 | ||
c392a001 | 5120 | -- Non-zero-size overlap check |
d4fd4637 JS |
5121 | |
5122 | Make_If_Expression (Loc, New_List ( | |
5123 | Cond, | |
5124 | ||
5125 | Make_Op_Ge (Loc, | |
5126 | Left_Opnd => | |
5127 | Make_Op_Add (Loc, | |
5128 | Left_Opnd => New_Copy_Tree (X_Addr), | |
5129 | Right_Opnd => | |
5130 | Make_Op_Subtract (Loc, | |
5131 | Left_Opnd => X_Size, | |
5132 | Right_Opnd => Make_Integer_Literal (Loc, 1))), | |
5133 | Right_Opnd => Y_Addr), | |
5134 | ||
5135 | Make_Op_Ge (Loc, | |
5136 | Left_Opnd => | |
5137 | Make_Op_Add (Loc, | |
5138 | Left_Opnd => New_Copy_Tree (Y_Addr), | |
5139 | Right_Opnd => | |
5140 | Make_Op_Subtract (Loc, | |
5141 | Left_Opnd => Y_Size, | |
5142 | Right_Opnd => Make_Integer_Literal (Loc, 1))), | |
5143 | Right_Opnd => X_Addr)))))); | |
2d42e881 ES |
5144 | |
5145 | Analyze_And_Resolve (N, Standard_Boolean); | |
5146 | end Overlaps_Storage; | |
5147 | ||
70482933 RK |
5148 | ------------ |
5149 | -- Output -- | |
5150 | ------------ | |
5151 | ||
5152 | when Attribute_Output => Output : declare | |
5153 | P_Type : constant Entity_Id := Entity (Pref); | |
70482933 RK |
5154 | U_Type : constant Entity_Id := Underlying_Type (P_Type); |
5155 | Pname : Entity_Id; | |
5156 | Decl : Node_Id; | |
5157 | Prag : Node_Id; | |
5158 | Arg3 : Node_Id; | |
5159 | Wfunc : Node_Id; | |
5160 | ||
5161 | begin | |
5162 | -- If no underlying type, we have an error that will be diagnosed | |
5163 | -- elsewhere, so here we just completely ignore the expansion. | |
5164 | ||
5165 | if No (U_Type) then | |
5166 | return; | |
5167 | end if; | |
5168 | ||
baa571ab AC |
5169 | -- Stream operations can appear in user code even if the restriction |
5170 | -- No_Streams is active (for example, when instantiating a predefined | |
5171 | -- container). In that case rewrite the attribute as a Raise to | |
5172 | -- prevent any run-time use. | |
5173 | ||
5174 | if Restriction_Active (No_Streams) then | |
5175 | Rewrite (N, | |
5176 | Make_Raise_Program_Error (Sloc (N), | |
b8b2d982 | 5177 | Reason => PE_Stream_Operation_Not_Allowed)); |
baa571ab AC |
5178 | Set_Etype (N, Standard_Void_Type); |
5179 | return; | |
5180 | end if; | |
5181 | ||
70482933 RK |
5182 | -- If TSS for Output is present, just call it |
5183 | ||
fbf5a39b | 5184 | Pname := Find_Stream_Subprogram (P_Type, TSS_Stream_Output); |
70482933 RK |
5185 | |
5186 | if Present (Pname) then | |
5187 | null; | |
5188 | ||
5189 | else | |
5190 | -- If there is a Stream_Convert pragma, use it, we rewrite | |
5191 | ||
5192 | -- sourcetyp'Output (stream, Item) | |
5193 | ||
5194 | -- as | |
5195 | ||
5196 | -- strmtyp'Output (Stream, strmwrite (acttyp (Item))); | |
5197 | ||
758c442c GD |
5198 | -- where strmwrite is the given Write function that converts an |
5199 | -- argument of type sourcetyp or a type acctyp, from which it is | |
5200 | -- derived to type strmtyp. The conversion to acttyp is required | |
5201 | -- for the derived case. | |
70482933 | 5202 | |
1d571f3b | 5203 | Prag := Get_Stream_Convert_Pragma (P_Type); |
70482933 RK |
5204 | |
5205 | if Present (Prag) then | |
5206 | Arg3 := | |
5207 | Next (Next (First (Pragma_Argument_Associations (Prag)))); | |
5208 | Wfunc := Entity (Expression (Arg3)); | |
5209 | ||
5210 | Rewrite (N, | |
5211 | Make_Attribute_Reference (Loc, | |
5212 | Prefix => New_Occurrence_Of (Etype (Wfunc), Loc), | |
5213 | Attribute_Name => Name_Output, | |
5214 | Expressions => New_List ( | |
5215 | Relocate_Node (First (Exprs)), | |
5216 | Make_Function_Call (Loc, | |
5217 | Name => New_Occurrence_Of (Wfunc, Loc), | |
5218 | Parameter_Associations => New_List ( | |
31104818 | 5219 | OK_Convert_To (Etype (First_Formal (Wfunc)), |
70482933 RK |
5220 | Relocate_Node (Next (First (Exprs))))))))); |
5221 | ||
5222 | Analyze (N); | |
5223 | return; | |
5224 | ||
29f2d76c SB |
5225 | -- Limited types |
5226 | ||
5227 | elsif Default_Streaming_Unavailable (U_Type) then | |
5228 | -- Do the same thing here as is done above in the | |
5229 | -- case where a No_Streams restriction is active. | |
5230 | ||
5231 | Rewrite (N, | |
5232 | Make_Raise_Program_Error (Sloc (N), | |
5233 | Reason => PE_Stream_Operation_Not_Allowed)); | |
5234 | Set_Etype (N, Standard_Void_Type); | |
5235 | return; | |
5236 | ||
890f1954 RD |
5237 | -- For elementary types, we call the W_xxx routine directly. Note |
5238 | -- that the effect of Write and Output is identical for the case | |
5239 | -- of an elementary type (there are no discriminants or bounds). | |
70482933 RK |
5240 | |
5241 | elsif Is_Elementary_Type (U_Type) then | |
5242 | ||
5243 | -- A special case arises if we have a defined _Write routine, | |
5244 | -- since in this case we are required to call this routine. | |
5245 | ||
a3fbecee EB |
5246 | if Present (Find_Inherited_TSS (P_Type, TSS_Stream_Write)) then |
5247 | Build_Record_Or_Elementary_Output_Procedure | |
5248 | (Loc, P_Type, Decl, Pname); | |
5249 | Insert_Action (N, Decl); | |
70482933 | 5250 | |
a3fbecee | 5251 | -- For normal cases, we call the W_xxx routine directly |
70482933 | 5252 | |
a3fbecee EB |
5253 | else |
5254 | Rewrite (N, Build_Elementary_Write_Call (N)); | |
5255 | Analyze (N); | |
5256 | return; | |
5257 | end if; | |
70482933 RK |
5258 | |
5259 | -- Array type case | |
5260 | ||
5261 | elsif Is_Array_Type (U_Type) then | |
5262 | Build_Array_Output_Procedure (Loc, U_Type, Decl, Pname); | |
fb632ef5 | 5263 | Compile_Stream_Body_In_Scope (N, Decl, U_Type); |
70482933 RK |
5264 | |
5265 | -- Class-wide case, first output external tag, then dispatch | |
5266 | -- to the appropriate primitive Output function (RM 13.13.2(31)). | |
5267 | ||
5268 | elsif Is_Class_Wide_Type (P_Type) then | |
0669bebe GB |
5269 | |
5270 | -- No need to do anything else compiling under restriction | |
5271 | -- No_Dispatching_Calls. During the semantic analysis we | |
5272 | -- already notified such violation. | |
5273 | ||
5274 | if Restriction_Active (No_Dispatching_Calls) then | |
5275 | return; | |
5276 | end if; | |
5277 | ||
70482933 RK |
5278 | Tag_Write : declare |
5279 | Strm : constant Node_Id := First (Exprs); | |
5280 | Item : constant Node_Id := Next (Strm); | |
5281 | ||
5282 | begin | |
31104818 HK |
5283 | -- Ada 2005 (AI-344): Check that the accessibility level |
5284 | -- of the type of the output object is not deeper than | |
5285 | -- that of the attribute's prefix type. | |
5286 | ||
758c442c GD |
5287 | -- if Get_Access_Level (Item'Tag) |
5288 | -- /= Get_Access_Level (P_Type'Tag) | |
5289 | -- then | |
5290 | -- raise Tag_Error; | |
5291 | -- end if; | |
31104818 | 5292 | |
758c442c GD |
5293 | -- String'Output (Strm, External_Tag (Item'Tag)); |
5294 | ||
31104818 HK |
5295 | -- We cannot figure out a practical way to implement this |
5296 | -- accessibility check on virtual machines, so we omit it. | |
758c442c | 5297 | |
0791fbe9 | 5298 | if Ada_Version >= Ada_2005 |
1f110335 | 5299 | and then Tagged_Type_Expansion |
31104818 | 5300 | then |
758c442c GD |
5301 | Insert_Action (N, |
5302 | Make_Implicit_If_Statement (N, | |
5303 | Condition => | |
5304 | Make_Op_Ne (Loc, | |
5305 | Left_Opnd => | |
0669bebe GB |
5306 | Build_Get_Access_Level (Loc, |
5307 | Make_Attribute_Reference (Loc, | |
5308 | Prefix => | |
5309 | Relocate_Node ( | |
5310 | Duplicate_Subexpr (Item, | |
5311 | Name_Req => True)), | |
5312 | Attribute_Name => Name_Tag)), | |
5313 | ||
758c442c | 5314 | Right_Opnd => |
0669bebe GB |
5315 | Make_Integer_Literal (Loc, |
5316 | Type_Access_Level (P_Type))), | |
5317 | ||
758c442c GD |
5318 | Then_Statements => |
5319 | New_List (Make_Raise_Statement (Loc, | |
5320 | New_Occurrence_Of ( | |
5321 | RTE (RE_Tag_Error), Loc))))); | |
5322 | end if; | |
70482933 RK |
5323 | |
5324 | Insert_Action (N, | |
5325 | Make_Attribute_Reference (Loc, | |
5326 | Prefix => New_Occurrence_Of (Standard_String, Loc), | |
5327 | Attribute_Name => Name_Output, | |
5328 | Expressions => New_List ( | |
5329 | Relocate_Node (Duplicate_Subexpr (Strm)), | |
5330 | Make_Function_Call (Loc, | |
5331 | Name => | |
5332 | New_Occurrence_Of (RTE (RE_External_Tag), Loc), | |
5333 | Parameter_Associations => New_List ( | |
5334 | Make_Attribute_Reference (Loc, | |
5335 | Prefix => | |
5336 | Relocate_Node | |
5337 | (Duplicate_Subexpr (Item, Name_Req => True)), | |
5338 | Attribute_Name => Name_Tag)))))); | |
5339 | end Tag_Write; | |
5340 | ||
fbf5a39b | 5341 | Pname := Find_Prim_Op (U_Type, TSS_Stream_Output); |
70482933 RK |
5342 | |
5343 | -- Tagged type case, use the primitive Output function | |
5344 | ||
5345 | elsif Is_Tagged_Type (U_Type) then | |
fbf5a39b | 5346 | Pname := Find_Prim_Op (U_Type, TSS_Stream_Output); |
70482933 | 5347 | |
0669bebe GB |
5348 | -- All other record type cases, including protected records. |
5349 | -- The latter only arise for expander generated code for | |
5350 | -- handling shared passive partition access. | |
70482933 RK |
5351 | |
5352 | else | |
5353 | pragma Assert | |
5354 | (Is_Record_Type (U_Type) or else Is_Protected_Type (U_Type)); | |
5355 | ||
5d09245e AC |
5356 | -- Ada 2005 (AI-216): Program_Error is raised when executing |
5357 | -- the default implementation of the Output attribute of an | |
5358 | -- unchecked union type if the type lacks default discriminant | |
5359 | -- values. | |
5360 | ||
5361 | if Is_Unchecked_Union (Base_Type (U_Type)) | |
d24ef4e6 PT |
5362 | and then |
5363 | No (Discriminant_Default_Value (First_Discriminant (U_Type))) | |
5d09245e | 5364 | then |
d24ef4e6 | 5365 | Rewrite (N, |
5d09245e AC |
5366 | Make_Raise_Program_Error (Loc, |
5367 | Reason => PE_Unchecked_Union_Restriction)); | |
d24ef4e6 | 5368 | Set_Etype (N, Standard_Void_Type); |
5d09245e AC |
5369 | return; |
5370 | end if; | |
5371 | ||
70482933 RK |
5372 | Build_Record_Or_Elementary_Output_Procedure |
5373 | (Loc, Base_Type (U_Type), Decl, Pname); | |
5374 | Insert_Action (N, Decl); | |
5375 | end if; | |
5376 | end if; | |
5377 | ||
5378 | -- If we fall through, Pname is the name of the procedure to call | |
5379 | ||
110d0820 | 5380 | Rewrite_Attribute_Proc_Call (Pname); |
70482933 RK |
5381 | end Output; |
5382 | ||
5383 | --------- | |
5384 | -- Pos -- | |
5385 | --------- | |
5386 | ||
47d3b920 AC |
5387 | -- For enumeration types, with a non-standard representation we generate |
5388 | -- a call to the _Rep_To_Pos function created when the type was frozen. | |
10e168cd | 5389 | -- The call has the form: |
70482933 | 5390 | |
fbf5a39b | 5391 | -- _rep_to_pos (expr, flag) |
70482933 | 5392 | |
fbf5a39b AC |
5393 | -- The parameter flag is True if range checks are enabled, causing |
5394 | -- Program_Error to be raised if the expression has an invalid | |
5395 | -- representation, and False if range checks are suppressed. | |
70482933 | 5396 | |
f193b29e EB |
5397 | -- For enumeration types with a standard representation, Pos can be |
5398 | -- rewritten as a simple conversion with Conversion_OK set. | |
5399 | ||
10e168cd EB |
5400 | -- For integer types, Pos is equivalent to a simple integer conversion |
5401 | -- and we rewrite it as such. | |
70482933 | 5402 | |
d8f43ee6 | 5403 | when Attribute_Pos => Pos : declare |
f193b29e | 5404 | Expr : constant Node_Id := First (Exprs); |
10e168cd | 5405 | Etyp : Entity_Id := Base_Type (Ptyp); |
70482933 RK |
5406 | |
5407 | begin | |
5408 | -- Deal with zero/non-zero boolean values | |
5409 | ||
5410 | if Is_Boolean_Type (Etyp) then | |
f193b29e | 5411 | Adjust_Condition (Expr); |
70482933 RK |
5412 | Etyp := Standard_Boolean; |
5413 | Set_Prefix (N, New_Occurrence_Of (Standard_Boolean, Loc)); | |
5414 | end if; | |
5415 | ||
5416 | -- Case of enumeration type | |
5417 | ||
5418 | if Is_Enumeration_Type (Etyp) then | |
5419 | ||
5420 | -- Non-standard enumeration type (generate call) | |
5421 | ||
5422 | if Present (Enum_Pos_To_Rep (Etyp)) then | |
fbf5a39b | 5423 | Append_To (Exprs, Rep_To_Pos_Flag (Etyp, Loc)); |
70482933 RK |
5424 | Rewrite (N, |
5425 | Convert_To (Typ, | |
5426 | Make_Function_Call (Loc, | |
5427 | Name => | |
e4494292 | 5428 | New_Occurrence_Of (TSS (Etyp, TSS_Rep_To_Pos), Loc), |
70482933 RK |
5429 | Parameter_Associations => Exprs))); |
5430 | ||
f193b29e | 5431 | -- Standard enumeration type (replace by conversion) |
70482933 | 5432 | |
f193b29e EB |
5433 | -- This is simply a direct conversion from the enumeration type to |
5434 | -- the target integer type, which is treated by the back end as a | |
5435 | -- normal integer conversion, treating the enumeration type as an | |
5436 | -- integer, which is exactly what we want. We set Conversion_OK to | |
5437 | -- make sure that the analyzer does not complain about what might | |
5438 | -- be an illegal conversion. | |
5439 | ||
5440 | -- However the target type is universal integer in most cases, | |
5441 | -- which is a very large type, so we first convert to a small | |
5442 | -- signed integer type in order not to lose the size information. | |
70482933 RK |
5443 | |
5444 | else | |
f193b29e EB |
5445 | Rewrite (N, OK_Convert_To (Get_Integer_Type (Ptyp), Expr)); |
5446 | Convert_To_And_Rewrite (Typ, N); | |
5447 | ||
70482933 RK |
5448 | end if; |
5449 | ||
5450 | -- Deal with integer types (replace by conversion) | |
5451 | ||
bd55fa10 | 5452 | else |
f193b29e | 5453 | Rewrite (N, Convert_To (Typ, Expr)); |
70482933 RK |
5454 | end if; |
5455 | ||
f193b29e | 5456 | Analyze_And_Resolve (N, Typ); |
70482933 RK |
5457 | end Pos; |
5458 | ||
5459 | -------------- | |
5460 | -- Position -- | |
5461 | -------------- | |
5462 | ||
12be130c EB |
5463 | -- We leave the computation up to the back end, since we don't know what |
5464 | -- layout will be chosen if no component clause was specified. | |
70482933 | 5465 | |
12be130c EB |
5466 | when Attribute_Position => |
5467 | Apply_Universal_Integer_Attribute_Checks (N); | |
70482933 RK |
5468 | |
5469 | ---------- | |
5470 | -- Pred -- | |
5471 | ---------- | |
5472 | ||
29049f0b AC |
5473 | -- 1. Deal with enumeration types with holes. |
5474 | -- 2. For floating-point, generate call to attribute function. | |
5475 | -- 3. For other cases, deal with constraint checking. | |
70482933 | 5476 | |
d8f43ee6 | 5477 | when Attribute_Pred => Pred : declare |
21d27997 | 5478 | Etyp : constant Entity_Id := Base_Type (Ptyp); |
70482933 RK |
5479 | |
5480 | begin | |
5481 | -- For enumeration types with non-standard representations, we | |
79e267f9 | 5482 | -- expand typ'Pred (x) into: |
70482933 RK |
5483 | |
5484 | -- Pos_To_Rep (Rep_To_Pos (x) - 1) | |
5485 | ||
79e267f9 EB |
5486 | -- if the representation is non-contiguous, and just x - 1 if it is |
5487 | -- after having dealt with constraint checking. | |
fbf5a39b | 5488 | |
79e267f9 | 5489 | if Is_Enumeration_Type (Etyp) |
21d27997 | 5490 | and then Present (Enum_Pos_To_Rep (Etyp)) |
70482933 | 5491 | then |
21d27997 | 5492 | if Has_Contiguous_Rep (Etyp) then |
79e267f9 EB |
5493 | if not Range_Checks_Suppressed (Ptyp) then |
5494 | Set_Do_Range_Check (First (Exprs), False); | |
5495 | Expand_Pred_Succ_Attribute (N); | |
5496 | end if; | |
5497 | ||
79e267f9 EB |
5498 | Rewrite (N, |
5499 | Unchecked_Convert_To (Etyp, | |
5500 | Make_Op_Subtract (Loc, | |
5501 | Left_Opnd => | |
c7c7dd3a EB |
5502 | Unchecked_Convert_To ( |
5503 | Integer_Type_For | |
5504 | (Esize (Etyp), Is_Unsigned_Type (Etyp)), | |
5505 | First (Exprs)), | |
79e267f9 EB |
5506 | Right_Opnd => |
5507 | Make_Integer_Literal (Loc, 1)))); | |
70482933 | 5508 | |
fbf5a39b | 5509 | else |
16b54914 | 5510 | -- Add Boolean parameter True, to request program error if |
fbf5a39b AC |
5511 | -- we have a bad representation on our hands. If checks are |
5512 | -- suppressed, then add False instead | |
70482933 | 5513 | |
fbf5a39b AC |
5514 | Append_To (Exprs, Rep_To_Pos_Flag (Ptyp, Loc)); |
5515 | Rewrite (N, | |
5516 | Make_Indexed_Component (Loc, | |
21d27997 | 5517 | Prefix => |
e4494292 | 5518 | New_Occurrence_Of |
21d27997 | 5519 | (Enum_Pos_To_Rep (Etyp), Loc), |
fbf5a39b AC |
5520 | Expressions => New_List ( |
5521 | Make_Op_Subtract (Loc, | |
70482933 RK |
5522 | Left_Opnd => |
5523 | Make_Function_Call (Loc, | |
5524 | Name => | |
e4494292 | 5525 | New_Occurrence_Of |
21d27997 | 5526 | (TSS (Etyp, TSS_Rep_To_Pos), Loc), |
fbf5a39b | 5527 | Parameter_Associations => Exprs), |
70482933 | 5528 | Right_Opnd => Make_Integer_Literal (Loc, 1))))); |
fbf5a39b | 5529 | end if; |
70482933 | 5530 | |
79e267f9 EB |
5531 | -- Suppress checks since they have all been done above |
5532 | ||
5533 | Analyze_And_Resolve (N, Typ, Suppress => All_Checks); | |
70482933 RK |
5534 | |
5535 | -- For floating-point, we transform 'Pred into a call to the Pred | |
0083dd66 | 5536 | -- floating-point attribute function in Fat_xxx (xxx is root type). |
29049f0b | 5537 | -- Note that this function takes care of the overflow case. |
70482933 RK |
5538 | |
5539 | elsif Is_Floating_Point_Type (Ptyp) then | |
5540 | Expand_Fpt_Attribute_R (N); | |
5541 | Analyze_And_Resolve (N, Typ); | |
5542 | ||
5543 | -- For modular types, nothing to do (no overflow, since wraps) | |
5544 | ||
5545 | elsif Is_Modular_Integer_Type (Ptyp) then | |
5546 | null; | |
5547 | ||
d79e621a GD |
5548 | -- For other types, if argument is marked as needing a range check or |
5549 | -- overflow checking is enabled, we must generate a check. | |
70482933 | 5550 | |
d79e621a GD |
5551 | elsif not Overflow_Checks_Suppressed (Ptyp) |
5552 | or else Do_Range_Check (First (Exprs)) | |
5553 | then | |
5554 | Set_Do_Range_Check (First (Exprs), False); | |
aa9b151a | 5555 | Expand_Pred_Succ_Attribute (N); |
70482933 | 5556 | end if; |
70482933 RK |
5557 | end Pred; |
5558 | ||
3450ded1 GD |
5559 | ---------------------------------- |
5560 | -- Preelaborable_Initialization -- | |
5561 | ---------------------------------- | |
5562 | ||
5563 | when Attribute_Preelaborable_Initialization => | |
5564 | ||
5565 | -- This attribute should already be folded during analysis, but if | |
5566 | -- for some reason it hasn't been, we fold it now. | |
5567 | ||
5568 | Fold_Uint | |
5569 | (N, | |
5570 | UI_From_Int | |
5571 | (Boolean'Pos (Has_Preelaborable_Initialization (Ptyp))), | |
5572 | Static => False); | |
5573 | ||
7ce611e2 ES |
5574 | -------------- |
5575 | -- Priority -- | |
5576 | -------------- | |
5577 | ||
5578 | -- Ada 2005 (AI-327): Dynamic ceiling priorities | |
5579 | ||
5580 | -- We rewrite X'Priority as the following run-time call: | |
5581 | ||
5582 | -- Get_Ceiling (X._Object) | |
5583 | ||
5584 | -- Note that although X'Priority is notionally an object, it is quite | |
5585 | -- deliberately not defined as an aliased object in the RM. This means | |
5586 | -- that it works fine to rewrite it as a call, without having to worry | |
5587 | -- about complications that would other arise from X'Priority'Access, | |
5588 | -- which is illegal, because of the lack of aliasing. | |
5589 | ||
d8f43ee6 HK |
5590 | when Attribute_Priority => Priority : declare |
5591 | Call : Node_Id; | |
5592 | Conctyp : Entity_Id; | |
5593 | New_Itype : Entity_Id; | |
5594 | Object_Parm : Node_Id; | |
5595 | Subprg : Entity_Id; | |
5596 | RT_Subprg_Name : Node_Id; | |
7ce611e2 | 5597 | |
d8f43ee6 HK |
5598 | begin |
5599 | -- Look for the enclosing concurrent type | |
7ce611e2 | 5600 | |
d8f43ee6 HK |
5601 | Conctyp := Current_Scope; |
5602 | while not Is_Concurrent_Type (Conctyp) loop | |
5603 | Conctyp := Scope (Conctyp); | |
5604 | end loop; | |
7ce611e2 | 5605 | |
d8f43ee6 | 5606 | pragma Assert (Is_Protected_Type (Conctyp)); |
7ce611e2 | 5607 | |
d8f43ee6 | 5608 | -- Generate the actual of the call |
7ce611e2 | 5609 | |
d8f43ee6 HK |
5610 | Subprg := Current_Scope; |
5611 | while not Present (Protected_Body_Subprogram (Subprg)) loop | |
5612 | Subprg := Scope (Subprg); | |
5613 | end loop; | |
16f67b79 | 5614 | |
d8f43ee6 HK |
5615 | -- Use of 'Priority inside protected entries and barriers (in both |
5616 | -- cases the type of the first formal of their expanded subprogram | |
5617 | -- is Address) | |
16f67b79 | 5618 | |
d8f43ee6 HK |
5619 | if Etype (First_Entity (Protected_Body_Subprogram (Subprg))) = |
5620 | RTE (RE_Address) | |
5621 | then | |
5622 | -- In the expansion of protected entries the type of the first | |
5623 | -- formal of the Protected_Body_Subprogram is an Address. In order | |
5624 | -- to reference the _object component we generate: | |
16f67b79 | 5625 | |
d8f43ee6 HK |
5626 | -- type T is access p__ptTV; |
5627 | -- freeze T [] | |
16f67b79 | 5628 | |
d8f43ee6 HK |
5629 | New_Itype := Create_Itype (E_Access_Type, N); |
5630 | Set_Etype (New_Itype, New_Itype); | |
5631 | Set_Directly_Designated_Type (New_Itype, | |
5632 | Corresponding_Record_Type (Conctyp)); | |
5633 | Freeze_Itype (New_Itype, N); | |
16f67b79 | 5634 | |
d8f43ee6 HK |
5635 | -- Generate: |
5636 | -- T!(O)._object'unchecked_access | |
16f67b79 | 5637 | |
d8f43ee6 HK |
5638 | Object_Parm := |
5639 | Make_Attribute_Reference (Loc, | |
5640 | Prefix => | |
5641 | Make_Selected_Component (Loc, | |
5642 | Prefix => | |
5643 | Unchecked_Convert_To (New_Itype, | |
5644 | New_Occurrence_Of | |
5645 | (First_Entity (Protected_Body_Subprogram (Subprg)), | |
5646 | Loc)), | |
5647 | Selector_Name => Make_Identifier (Loc, Name_uObject)), | |
5648 | Attribute_Name => Name_Unchecked_Access); | |
16f67b79 | 5649 | |
d8f43ee6 | 5650 | -- Use of 'Priority inside a protected subprogram |
16f67b79 | 5651 | |
d8f43ee6 HK |
5652 | else |
5653 | Object_Parm := | |
5654 | Make_Attribute_Reference (Loc, | |
5655 | Prefix => | |
5656 | Make_Selected_Component (Loc, | |
5657 | Prefix => | |
5658 | New_Occurrence_Of | |
5659 | (First_Entity (Protected_Body_Subprogram (Subprg)), | |
5660 | Loc), | |
5661 | Selector_Name => Make_Identifier (Loc, Name_uObject)), | |
5662 | Attribute_Name => Name_Unchecked_Access); | |
5663 | end if; | |
7ce611e2 | 5664 | |
d8f43ee6 | 5665 | -- Select the appropriate run-time subprogram |
7ce611e2 | 5666 | |
d8f43ee6 HK |
5667 | if Number_Entries (Conctyp) = 0 then |
5668 | RT_Subprg_Name := New_Occurrence_Of (RTE (RE_Get_Ceiling), Loc); | |
5669 | else | |
5670 | RT_Subprg_Name := New_Occurrence_Of (RTE (RO_PE_Get_Ceiling), Loc); | |
5671 | end if; | |
7ce611e2 | 5672 | |
d8f43ee6 HK |
5673 | Call := |
5674 | Make_Function_Call (Loc, | |
5675 | Name => RT_Subprg_Name, | |
5676 | Parameter_Associations => New_List (Object_Parm)); | |
7ce611e2 | 5677 | |
d8f43ee6 | 5678 | Rewrite (N, Call); |
16f67b79 | 5679 | |
d8f43ee6 HK |
5680 | -- Avoid the generation of extra checks on the pointer to the |
5681 | -- protected object. | |
16f67b79 | 5682 | |
d8f43ee6 HK |
5683 | Analyze_And_Resolve (N, Typ, Suppress => Access_Check); |
5684 | end Priority; | |
7ce611e2 | 5685 | |
110d0820 BD |
5686 | --------------- |
5687 | -- Put_Image -- | |
5688 | --------------- | |
5689 | ||
5690 | when Attribute_Put_Image => Put_Image : declare | |
5691 | use Exp_Put_Image; | |
5692 | U_Type : constant Entity_Id := Underlying_Type (Entity (Pref)); | |
5693 | Pname : Entity_Id; | |
5694 | Decl : Node_Id; | |
5695 | ||
5696 | begin | |
5697 | -- If no underlying type, we have an error that will be diagnosed | |
5698 | -- elsewhere, so here we just completely ignore the expansion. | |
5699 | ||
5700 | if No (U_Type) then | |
5701 | return; | |
5702 | end if; | |
5703 | ||
c324c77e BD |
5704 | -- If there is a TSS for Put_Image, just call it. This is true for |
5705 | -- tagged types (if enabled) and if there is a user-specified | |
5706 | -- Put_Image. | |
110d0820 BD |
5707 | |
5708 | Pname := TSS (U_Type, TSS_Put_Image); | |
5709 | if No (Pname) then | |
5710 | if Is_Tagged_Type (U_Type) and then Is_Derived_Type (U_Type) then | |
5711 | Pname := Find_Optional_Prim_Op (U_Type, TSS_Put_Image); | |
110d0820 BD |
5712 | else |
5713 | Pname := Find_Inherited_TSS (U_Type, TSS_Put_Image); | |
5714 | end if; | |
5715 | end if; | |
5716 | ||
5717 | if No (Pname) then | |
c324c77e BD |
5718 | -- If Put_Image is disabled, call the "unknown" version |
5719 | ||
5720 | if not Enable_Put_Image (U_Type) then | |
5721 | Rewrite (N, Build_Unknown_Put_Image_Call (N)); | |
5722 | Analyze (N); | |
5723 | return; | |
5724 | ||
110d0820 BD |
5725 | -- For elementary types, we call the routine in System.Put_Images |
5726 | -- directly. | |
5727 | ||
c324c77e | 5728 | elsif Is_Elementary_Type (U_Type) then |
110d0820 BD |
5729 | Rewrite (N, Build_Elementary_Put_Image_Call (N)); |
5730 | Analyze (N); | |
5731 | return; | |
5732 | ||
eb725219 | 5733 | elsif Is_Standard_String_Type (U_Type) then |
110d0820 BD |
5734 | Rewrite (N, Build_String_Put_Image_Call (N)); |
5735 | Analyze (N); | |
5736 | return; | |
5737 | ||
5738 | elsif Is_Array_Type (U_Type) then | |
5739 | Build_Array_Put_Image_Procedure (N, U_Type, Decl, Pname); | |
5740 | Insert_Action (N, Decl); | |
5741 | ||
5742 | -- Tagged type case, use the primitive Put_Image function. Note | |
5743 | -- that this will dispatch in the class-wide case which is what we | |
5744 | -- want. | |
5745 | ||
5746 | elsif Is_Tagged_Type (U_Type) then | |
5747 | Pname := Find_Optional_Prim_Op (U_Type, TSS_Put_Image); | |
5748 | ||
5749 | -- ????Need Find_Optional_Prim_Op instead of Find_Prim_Op, | |
5750 | -- because we might be deriving from a predefined type, which | |
5751 | -- currently has Enable_Put_Image False. | |
5752 | ||
5753 | if No (Pname) then | |
5754 | Rewrite (N, Build_Unknown_Put_Image_Call (N)); | |
5755 | Analyze (N); | |
5756 | return; | |
5757 | end if; | |
5758 | ||
5759 | elsif Is_Protected_Type (U_Type) then | |
5760 | Rewrite (N, Build_Protected_Put_Image_Call (N)); | |
5761 | Analyze (N); | |
5762 | return; | |
5763 | ||
5764 | elsif Is_Task_Type (U_Type) then | |
5765 | Rewrite (N, Build_Task_Put_Image_Call (N)); | |
5766 | Analyze (N); | |
5767 | return; | |
5768 | ||
c324c77e | 5769 | -- All other record type cases |
110d0820 BD |
5770 | |
5771 | else | |
5772 | pragma Assert (Is_Record_Type (U_Type)); | |
110d0820 BD |
5773 | Build_Record_Put_Image_Procedure |
5774 | (Loc, Full_Base (U_Type), Decl, Pname); | |
5775 | Insert_Action (N, Decl); | |
5776 | end if; | |
5777 | end if; | |
5778 | ||
5779 | -- If we fall through, Pname is the procedure to be called | |
5780 | ||
5781 | Rewrite_Attribute_Proc_Call (Pname); | |
5782 | end Put_Image; | |
5783 | ||
70482933 RK |
5784 | ------------------ |
5785 | -- Range_Length -- | |
5786 | ------------------ | |
5787 | ||
d8f43ee6 | 5788 | when Attribute_Range_Length => |
47d3b920 | 5789 | |
70482933 RK |
5790 | -- The only special processing required is for the case where |
5791 | -- Range_Length is applied to an enumeration type with holes. | |
5792 | -- In this case we transform | |
5793 | ||
5794 | -- X'Range_Length | |
5795 | ||
5796 | -- to | |
5797 | ||
5798 | -- X'Pos (X'Last) - X'Pos (X'First) + 1 | |
5799 | ||
5800 | -- So that the result reflects the proper Pos values instead | |
5801 | -- of the underlying representations. | |
5802 | ||
21d27997 RD |
5803 | if Is_Enumeration_Type (Ptyp) |
5804 | and then Has_Non_Standard_Rep (Ptyp) | |
70482933 RK |
5805 | then |
5806 | Rewrite (N, | |
5807 | Make_Op_Add (Loc, | |
d8f43ee6 | 5808 | Left_Opnd => |
70482933 | 5809 | Make_Op_Subtract (Loc, |
d8f43ee6 | 5810 | Left_Opnd => |
70482933 RK |
5811 | Make_Attribute_Reference (Loc, |
5812 | Attribute_Name => Name_Pos, | |
d8f43ee6 HK |
5813 | Prefix => New_Occurrence_Of (Ptyp, Loc), |
5814 | Expressions => New_List ( | |
70482933 RK |
5815 | Make_Attribute_Reference (Loc, |
5816 | Attribute_Name => Name_Last, | |
d8f43ee6 HK |
5817 | Prefix => |
5818 | New_Occurrence_Of (Ptyp, Loc)))), | |
70482933 RK |
5819 | |
5820 | Right_Opnd => | |
5821 | Make_Attribute_Reference (Loc, | |
5822 | Attribute_Name => Name_Pos, | |
d8f43ee6 HK |
5823 | Prefix => New_Occurrence_Of (Ptyp, Loc), |
5824 | Expressions => New_List ( | |
70482933 RK |
5825 | Make_Attribute_Reference (Loc, |
5826 | Attribute_Name => Name_First, | |
d8f43ee6 HK |
5827 | Prefix => |
5828 | New_Occurrence_Of (Ptyp, Loc))))), | |
70482933 | 5829 | |
49d140bb | 5830 | Right_Opnd => Make_Integer_Literal (Loc, 1))); |
70482933 RK |
5831 | |
5832 | Analyze_And_Resolve (N, Typ); | |
5833 | ||
21d27997 RD |
5834 | -- For all other cases, the attribute is handled by the back end, but |
5835 | -- we need to deal with the case of the range check on a universal | |
5836 | -- integer. | |
70482933 RK |
5837 | |
5838 | else | |
5839 | Apply_Universal_Integer_Attribute_Checks (N); | |
5840 | end if; | |
70482933 | 5841 | |
3c08de34 ES |
5842 | ------------ |
5843 | -- Reduce -- | |
5844 | ------------ | |
5845 | ||
5846 | when Attribute_Reduce => | |
5847 | declare | |
90cb252f PT |
5848 | Loc : constant Source_Ptr := Sloc (N); |
5849 | E1 : constant Node_Id := First (Expressions (N)); | |
5850 | E2 : constant Node_Id := Next (E1); | |
5851 | Bnn : constant Entity_Id := Make_Temporary (Loc, 'B', N); | |
5852 | Typ : constant Entity_Id := Etype (N); | |
6d0dedfa | 5853 | |
3c08de34 | 5854 | New_Loop : Node_Id; |
90cb252f | 5855 | Stat : Node_Id; |
6d0dedfa ES |
5856 | |
5857 | function Build_Stat (Comp : Node_Id) return Node_Id; | |
5858 | -- The reducer can be a function, a procedure whose first | |
5859 | -- parameter is in-out, or an attribute that is a function, | |
5860 | -- which (for now) can only be Min/Max. This subprogram | |
5861 | -- builds the corresponding computation for the generated loop. | |
5862 | ||
5863 | ---------------- | |
5864 | -- Build_Stat -- | |
5865 | ---------------- | |
5866 | ||
5867 | function Build_Stat (Comp : Node_Id) return Node_Id is | |
5868 | begin | |
5869 | if Nkind (E1) = N_Attribute_Reference then | |
90cb252f PT |
5870 | Stat := Make_Assignment_Statement (Loc, |
5871 | Name => New_Occurrence_Of (Bnn, Loc), | |
5872 | Expression => Make_Attribute_Reference (Loc, | |
5873 | Attribute_Name => Attribute_Name (E1), | |
5874 | Prefix => New_Copy (Prefix (E1)), | |
5875 | Expressions => New_List ( | |
5876 | New_Occurrence_Of (Bnn, Loc), | |
5877 | Comp))); | |
6d0dedfa ES |
5878 | |
5879 | elsif Ekind (Entity (E1)) = E_Procedure then | |
5880 | Stat := Make_Procedure_Call_Statement (Loc, | |
5881 | Name => New_Occurrence_Of (Entity (E1), Loc), | |
5882 | Parameter_Associations => New_List ( | |
5883 | New_Occurrence_Of (Bnn, Loc), | |
5884 | Comp)); | |
5885 | else | |
90cb252f PT |
5886 | Stat := Make_Assignment_Statement (Loc, |
5887 | Name => New_Occurrence_Of (Bnn, Loc), | |
5888 | Expression => Make_Function_Call (Loc, | |
5889 | Name => New_Occurrence_Of (Entity (E1), Loc), | |
5890 | Parameter_Associations => New_List ( | |
5891 | New_Occurrence_Of (Bnn, Loc), | |
5892 | Comp))); | |
6d0dedfa ES |
5893 | end if; |
5894 | ||
5895 | return Stat; | |
5896 | end Build_Stat; | |
3c08de34 | 5897 | |
dab8e608 GD |
5898 | -- If the prefix is an aggregate, its unique component is an |
5899 | -- Iterated_Element, and we create a loop out of its iterator. | |
90cb252f PT |
5900 | -- The iterated_component_association is parsed as a loop parameter |
5901 | -- specification with "in" or as a container iterator with "of". | |
3c08de34 ES |
5902 | |
5903 | begin | |
5904 | if Nkind (Prefix (N)) = N_Aggregate then | |
5905 | declare | |
5906 | Stream : constant Node_Id := | |
dab8e608 | 5907 | First (Component_Associations (Prefix (N))); |
3c08de34 | 5908 | Expr : constant Node_Id := Expression (Stream); |
6d0dedfa ES |
5909 | Id : constant Node_Id := Defining_Identifier (Stream); |
5910 | It_Spec : constant Node_Id := | |
5911 | Iterator_Specification (Stream); | |
5912 | Ch : Node_Id; | |
5913 | Iter : Node_Id; | |
5914 | ||
3c08de34 | 5915 | begin |
6d0dedfa ES |
5916 | -- Iteration may be given by an element iterator: |
5917 | ||
5918 | if Nkind (Stream) = N_Iterated_Component_Association | |
5919 | and then Present (It_Spec) | |
5920 | and then Of_Present (It_Spec) | |
5921 | then | |
5922 | Iter := | |
5923 | Make_Iteration_Scheme (Loc, | |
5924 | Iterator_Specification => | |
5925 | Relocate_Node (It_Spec), | |
5926 | Loop_Parameter_Specification => Empty); | |
5927 | ||
5928 | else | |
5929 | Ch := First (Discrete_Choices (Stream)); | |
5930 | Iter := | |
3c08de34 ES |
5931 | Make_Iteration_Scheme (Loc, |
5932 | Iterator_Specification => Empty, | |
5933 | Loop_Parameter_Specification => | |
5934 | Make_Loop_Parameter_Specification (Loc, | |
5935 | Defining_Identifier => New_Copy (Id), | |
5936 | Discrete_Subtype_Definition => | |
6d0dedfa ES |
5937 | Relocate_Node (Ch))); |
5938 | end if; | |
5939 | ||
5940 | New_Loop := Make_Loop_Statement (Loc, | |
5941 | Iteration_Scheme => Iter, | |
3c08de34 | 5942 | End_Label => Empty, |
6d0dedfa ES |
5943 | Statements => |
5944 | New_List (Build_Stat (Relocate_Node (Expr)))); | |
3c08de34 | 5945 | end; |
6d0dedfa | 5946 | |
3c08de34 | 5947 | else |
dab8e608 GD |
5948 | -- If the prefix is a name, we construct an element iterator |
5949 | -- over it. Its expansion will verify that it is an array or | |
5950 | -- a container with the proper aspects. | |
3c08de34 ES |
5951 | |
5952 | declare | |
5953 | Iter : Node_Id; | |
5954 | Elem : constant Entity_Id := Make_Temporary (Loc, 'E', N); | |
5955 | ||
5956 | begin | |
5957 | Iter := | |
5958 | Make_Iterator_Specification (Loc, | |
5959 | Defining_Identifier => Elem, | |
5960 | Name => Relocate_Node (Prefix (N)), | |
5961 | Subtype_Indication => Empty); | |
5962 | Set_Of_Present (Iter); | |
5963 | ||
5964 | New_Loop := Make_Loop_Statement (Loc, | |
5965 | Iteration_Scheme => | |
5966 | Make_Iteration_Scheme (Loc, | |
5967 | Iterator_Specification => Iter, | |
5968 | Loop_Parameter_Specification => Empty), | |
5969 | End_Label => Empty, | |
5970 | Statements => New_List ( | |
6d0dedfa | 5971 | Build_Stat (New_Occurrence_Of (Elem, Loc)))); |
3c08de34 ES |
5972 | end; |
5973 | end if; | |
5974 | ||
5975 | Rewrite (N, | |
5976 | Make_Expression_With_Actions (Loc, | |
5977 | Actions => New_List ( | |
5978 | Make_Object_Declaration (Loc, | |
5979 | Defining_Identifier => Bnn, | |
5980 | Object_Definition => | |
5981 | New_Occurrence_Of (Typ, Loc), | |
5982 | Expression => Relocate_Node (E2)), New_Loop), | |
5983 | Expression => New_Occurrence_Of (Bnn, Loc))); | |
5984 | Analyze_And_Resolve (N, Typ); | |
5985 | end; | |
5986 | ||
70482933 RK |
5987 | ---------- |
5988 | -- Read -- | |
5989 | ---------- | |
5990 | ||
5991 | when Attribute_Read => Read : declare | |
5992 | P_Type : constant Entity_Id := Entity (Pref); | |
5993 | B_Type : constant Entity_Id := Base_Type (P_Type); | |
5994 | U_Type : constant Entity_Id := Underlying_Type (P_Type); | |
5995 | Pname : Entity_Id; | |
5996 | Decl : Node_Id; | |
5997 | Prag : Node_Id; | |
5998 | Arg2 : Node_Id; | |
5999 | Rfunc : Node_Id; | |
6000 | Lhs : Node_Id; | |
6001 | Rhs : Node_Id; | |
6002 | ||
6003 | begin | |
6004 | -- If no underlying type, we have an error that will be diagnosed | |
6005 | -- elsewhere, so here we just completely ignore the expansion. | |
6006 | ||
6007 | if No (U_Type) then | |
6008 | return; | |
6009 | end if; | |
6010 | ||
baa571ab AC |
6011 | -- Stream operations can appear in user code even if the restriction |
6012 | -- No_Streams is active (for example, when instantiating a predefined | |
6013 | -- container). In that case rewrite the attribute as a Raise to | |
6014 | -- prevent any run-time use. | |
6015 | ||
6016 | if Restriction_Active (No_Streams) then | |
6017 | Rewrite (N, | |
6018 | Make_Raise_Program_Error (Sloc (N), | |
b8b2d982 | 6019 | Reason => PE_Stream_Operation_Not_Allowed)); |
baa571ab AC |
6020 | Set_Etype (N, B_Type); |
6021 | return; | |
6022 | end if; | |
6023 | ||
70482933 RK |
6024 | -- The simple case, if there is a TSS for Read, just call it |
6025 | ||
fbf5a39b | 6026 | Pname := Find_Stream_Subprogram (P_Type, TSS_Stream_Read); |
70482933 RK |
6027 | |
6028 | if Present (Pname) then | |
6029 | null; | |
6030 | ||
6031 | else | |
6032 | -- If there is a Stream_Convert pragma, use it, we rewrite | |
6033 | ||
6034 | -- sourcetyp'Read (stream, Item) | |
6035 | ||
6036 | -- as | |
6037 | ||
6038 | -- Item := sourcetyp (strmread (strmtyp'Input (Stream))); | |
6039 | ||
758c442c GD |
6040 | -- where strmread is the given Read function that converts an |
6041 | -- argument of type strmtyp to type sourcetyp or a type from which | |
6042 | -- it is derived. The conversion to sourcetyp is required in the | |
6043 | -- latter case. | |
70482933 RK |
6044 | |
6045 | -- A special case arises if Item is a type conversion in which | |
6046 | -- case, we have to expand to: | |
6047 | ||
6048 | -- Itemx := typex (strmread (strmtyp'Input (Stream))); | |
6049 | ||
6050 | -- where Itemx is the expression of the type conversion (i.e. | |
6051 | -- the actual object), and typex is the type of Itemx. | |
6052 | ||
1d571f3b | 6053 | Prag := Get_Stream_Convert_Pragma (P_Type); |
70482933 RK |
6054 | |
6055 | if Present (Prag) then | |
6056 | Arg2 := Next (First (Pragma_Argument_Associations (Prag))); | |
6057 | Rfunc := Entity (Expression (Arg2)); | |
6058 | Lhs := Relocate_Node (Next (First (Exprs))); | |
6059 | Rhs := | |
31104818 | 6060 | OK_Convert_To (B_Type, |
70482933 RK |
6061 | Make_Function_Call (Loc, |
6062 | Name => New_Occurrence_Of (Rfunc, Loc), | |
6063 | Parameter_Associations => New_List ( | |
6064 | Make_Attribute_Reference (Loc, | |
6065 | Prefix => | |
6066 | New_Occurrence_Of | |
6067 | (Etype (First_Formal (Rfunc)), Loc), | |
6068 | Attribute_Name => Name_Input, | |
6069 | Expressions => New_List ( | |
6070 | Relocate_Node (First (Exprs))))))); | |
6071 | ||
6072 | if Nkind (Lhs) = N_Type_Conversion then | |
6073 | Lhs := Expression (Lhs); | |
6074 | Rhs := Convert_To (Etype (Lhs), Rhs); | |
6075 | end if; | |
6076 | ||
6077 | Rewrite (N, | |
6078 | Make_Assignment_Statement (Loc, | |
fbf5a39b | 6079 | Name => Lhs, |
70482933 RK |
6080 | Expression => Rhs)); |
6081 | Set_Assignment_OK (Lhs); | |
6082 | Analyze (N); | |
6083 | return; | |
6084 | ||
29f2d76c SB |
6085 | -- Limited types |
6086 | ||
6087 | elsif Default_Streaming_Unavailable (U_Type) then | |
6088 | -- Do the same thing here as is done above in the | |
6089 | -- case where a No_Streams restriction is active. | |
6090 | ||
6091 | Rewrite (N, | |
6092 | Make_Raise_Program_Error (Sloc (N), | |
6093 | Reason => PE_Stream_Operation_Not_Allowed)); | |
6094 | Set_Etype (N, B_Type); | |
6095 | return; | |
6096 | ||
70482933 RK |
6097 | -- For elementary types, we call the I_xxx routine using the first |
6098 | -- parameter and then assign the result into the second parameter. | |
6099 | -- We set Assignment_OK to deal with the conversion case. | |
6100 | ||
6101 | elsif Is_Elementary_Type (U_Type) then | |
6102 | declare | |
6103 | Lhs : Node_Id; | |
6104 | Rhs : Node_Id; | |
6105 | ||
6106 | begin | |
6107 | Lhs := Relocate_Node (Next (First (Exprs))); | |
6108 | Rhs := Build_Elementary_Input_Call (N); | |
6109 | ||
6110 | if Nkind (Lhs) = N_Type_Conversion then | |
6111 | Lhs := Expression (Lhs); | |
6112 | Rhs := Convert_To (Etype (Lhs), Rhs); | |
6113 | end if; | |
6114 | ||
6115 | Set_Assignment_OK (Lhs); | |
6116 | ||
6117 | Rewrite (N, | |
6118 | Make_Assignment_Statement (Loc, | |
49d140bb | 6119 | Name => Lhs, |
70482933 RK |
6120 | Expression => Rhs)); |
6121 | ||
6122 | Analyze (N); | |
6123 | return; | |
6124 | end; | |
6125 | ||
6126 | -- Array type case | |
6127 | ||
6128 | elsif Is_Array_Type (U_Type) then | |
6129 | Build_Array_Read_Procedure (N, U_Type, Decl, Pname); | |
fb632ef5 | 6130 | Compile_Stream_Body_In_Scope (N, Decl, U_Type); |
70482933 RK |
6131 | |
6132 | -- Tagged type case, use the primitive Read function. Note that | |
6133 | -- this will dispatch in the class-wide case which is what we want | |
6134 | ||
6135 | elsif Is_Tagged_Type (U_Type) then | |
fbf5a39b | 6136 | Pname := Find_Prim_Op (U_Type, TSS_Stream_Read); |
70482933 | 6137 | |
758c442c GD |
6138 | -- All other record type cases, including protected records. The |
6139 | -- latter only arise for expander generated code for handling | |
6140 | -- shared passive partition access. | |
70482933 RK |
6141 | |
6142 | else | |
6143 | pragma Assert | |
6144 | (Is_Record_Type (U_Type) or else Is_Protected_Type (U_Type)); | |
6145 | ||
5d09245e AC |
6146 | -- Ada 2005 (AI-216): Program_Error is raised when executing |
6147 | -- the default implementation of the Read attribute of an | |
1f70c47f AC |
6148 | -- Unchecked_Union type. We replace the attribute with a |
6149 | -- raise statement (rather than inserting it before) to handle | |
6150 | -- properly the case of an unchecked union that is a record | |
6151 | -- component. | |
5d09245e AC |
6152 | |
6153 | if Is_Unchecked_Union (Base_Type (U_Type)) then | |
1f70c47f | 6154 | Rewrite (N, |
5d09245e AC |
6155 | Make_Raise_Program_Error (Loc, |
6156 | Reason => PE_Unchecked_Union_Restriction)); | |
1f70c47f AC |
6157 | Set_Etype (N, B_Type); |
6158 | return; | |
5d09245e AC |
6159 | end if; |
6160 | ||
8adc8d9b | 6161 | if Has_Defaulted_Discriminants (U_Type) then |
70482933 | 6162 | Build_Mutable_Record_Read_Procedure |
96d2756f | 6163 | (Loc, Full_Base (U_Type), Decl, Pname); |
70482933 RK |
6164 | else |
6165 | Build_Record_Read_Procedure | |
96d2756f | 6166 | (Loc, Full_Base (U_Type), Decl, Pname); |
70482933 RK |
6167 | end if; |
6168 | ||
fb632ef5 | 6169 | Insert_Action (N, Decl); |
70482933 RK |
6170 | end if; |
6171 | end if; | |
6172 | ||
110d0820 | 6173 | Rewrite_Attribute_Proc_Call (Pname); |
70482933 RK |
6174 | end Read; |
6175 | ||
1b0b0f18 AC |
6176 | --------- |
6177 | -- Ref -- | |
6178 | --------- | |
6179 | ||
6180 | -- Ref is identical to To_Address, see To_Address for processing | |
6181 | ||
70482933 RK |
6182 | --------------- |
6183 | -- Remainder -- | |
6184 | --------------- | |
6185 | ||
6186 | -- Transforms 'Remainder into a call to the floating-point attribute | |
6187 | -- function Remainder in Fat_xxx (where xxx is the root type) | |
6188 | ||
6189 | when Attribute_Remainder => | |
6190 | Expand_Fpt_Attribute_RR (N); | |
6191 | ||
21d27997 RD |
6192 | ------------ |
6193 | -- Result -- | |
6194 | ------------ | |
6195 | ||
6196 | -- Transform 'Result into reference to _Result formal. At the point | |
6197 | -- where a legal 'Result attribute is expanded, we know that we are in | |
6198 | -- the context of a _Postcondition function with a _Result parameter. | |
6199 | ||
6200 | when Attribute_Result => | |
49d140bb | 6201 | Rewrite (N, Make_Identifier (Loc, Chars => Name_uResult)); |
21d27997 RD |
6202 | Analyze_And_Resolve (N, Typ); |
6203 | ||
70482933 RK |
6204 | ----------- |
6205 | -- Round -- | |
6206 | ----------- | |
6207 | ||
32543637 EB |
6208 | -- The handling of the Round attribute is delicate when the operand is |
6209 | -- universal fixed. In this case, the processing in Sem_Attr introduced | |
6210 | -- a conversion to universal real, reflecting the semantics of Round, | |
6211 | -- but we do not want anything to do with universal real at run time, | |
6212 | -- since this corresponds to using floating-point arithmetic. | |
758c442c GD |
6213 | |
6214 | -- What we have now is that the Etype of the Round attribute correctly | |
6215 | -- indicates the final result type. The operand of the Round is the | |
6216 | -- conversion to universal real, described above, and the operand of | |
6217 | -- this conversion is the actual operand of Round, which may be the | |
32543637 | 6218 | -- special case of a fixed point multiplication or division. |
758c442c | 6219 | |
32543637 | 6220 | -- The expander will expand first the operand of the conversion, then |
758c442c GD |
6221 | -- the conversion, and finally the round attribute itself, since we |
6222 | -- always work inside out. But we cannot simply process naively in this | |
6223 | -- order. In the semantic world where universal fixed and real really | |
6224 | -- exist and have infinite precision, there is no problem, but in the | |
6225 | -- implementation world, where universal real is a floating-point type, | |
6226 | -- we would get the wrong result. | |
6227 | ||
32543637 EB |
6228 | -- So the approach is as follows. When expanding a multiply or divide |
6229 | -- whose type is universal fixed, Fixup_Universal_Fixed_Operation will | |
6230 | -- look up and skip the conversion to universal real if its parent is | |
6231 | -- a Round attribute, taking information from this attribute node. In | |
6232 | -- the other cases, Expand_N_Type_Conversion does the same by looking | |
6233 | -- at its parent to see if it is a Round attribute, before calling the | |
6234 | -- fixed-point expansion routine. | |
70482933 RK |
6235 | |
6236 | -- This means that by the time we get to expanding the Round attribute | |
6237 | -- itself, the Round is nothing more than a type conversion (and will | |
6238 | -- often be a null type conversion), so we just replace it with the | |
6239 | -- appropriate conversion operation. | |
6240 | ||
6241 | when Attribute_Round => | |
32543637 EB |
6242 | if Etype (First (Exprs)) = Etype (N) then |
6243 | Rewrite (N, Relocate_Node (First (Exprs))); | |
6244 | else | |
6245 | Rewrite (N, Convert_To (Etype (N), First (Exprs))); | |
6246 | Set_Rounded_Result (N); | |
6247 | end if; | |
70482933 RK |
6248 | Analyze_And_Resolve (N); |
6249 | ||
6250 | -------------- | |
6251 | -- Rounding -- | |
6252 | -------------- | |
6253 | ||
6254 | -- Transforms 'Rounding into a call to the floating-point attribute | |
6255 | -- function Rounding in Fat_xxx (where xxx is the root type) | |
24228312 | 6256 | -- Expansion is avoided for cases the back end can handle directly. |
70482933 RK |
6257 | |
6258 | when Attribute_Rounding => | |
24228312 AC |
6259 | if not Is_Inline_Floating_Point_Attribute (N) then |
6260 | Expand_Fpt_Attribute_R (N); | |
6261 | end if; | |
70482933 RK |
6262 | |
6263 | ------------- | |
6264 | -- Scaling -- | |
6265 | ------------- | |
6266 | ||
6267 | -- Transforms 'Scaling into a call to the floating-point attribute | |
6268 | -- function Scaling in Fat_xxx (where xxx is the root type) | |
6269 | ||
6270 | when Attribute_Scaling => | |
6271 | Expand_Fpt_Attribute_RI (N); | |
6272 | ||
e837a621 AC |
6273 | ---------------------------------------- |
6274 | -- Simple_Storage_Pool & Storage_Pool -- | |
6275 | ---------------------------------------- | |
a8551b5f | 6276 | |
e837a621 | 6277 | when Attribute_Simple_Storage_Pool | Attribute_Storage_Pool => |
a8551b5f AC |
6278 | Rewrite (N, |
6279 | Make_Type_Conversion (Loc, | |
e4494292 RD |
6280 | Subtype_Mark => New_Occurrence_Of (Etype (N), Loc), |
6281 | Expression => New_Occurrence_Of (Entity (N), Loc))); | |
a8551b5f AC |
6282 | Analyze_And_Resolve (N, Typ); |
6283 | ||
70482933 RK |
6284 | ---------- |
6285 | -- Size -- | |
6286 | ---------- | |
6287 | ||
d8f43ee6 HK |
6288 | when Attribute_Object_Size |
6289 | | Attribute_Size | |
6290 | | Attribute_Value_Size | |
6291 | | Attribute_VADS_Size | |
6292 | => | |
6293 | Size : declare | |
d8f43ee6 | 6294 | New_Node : Node_Id; |
70482933 | 6295 | |
d8f43ee6 HK |
6296 | begin |
6297 | -- Processing for VADS_Size case. Note that this processing | |
6298 | -- removes all traces of VADS_Size from the tree, and completes | |
6299 | -- all required processing for VADS_Size by translating the | |
6300 | -- attribute reference to an appropriate Size or Object_Size | |
6301 | -- reference. | |
6302 | ||
6303 | if Id = Attribute_VADS_Size | |
6304 | or else (Use_VADS_Size and then Id = Attribute_Size) | |
70482933 | 6305 | then |
d8f43ee6 HK |
6306 | -- If the size is specified, then we simply use the specified |
6307 | -- size. This applies to both types and objects. The size of an | |
6308 | -- object can be specified in the following ways: | |
6309 | ||
36e38022 | 6310 | -- An explicit size clause is given for an object |
d8f43ee6 HK |
6311 | -- A component size is specified for an indexed component |
6312 | -- A component clause is specified for a selected component | |
6313 | -- The object is a component of a packed composite object | |
6314 | ||
6315 | -- If the size is specified, then VADS_Size of an object | |
6316 | ||
6317 | if (Is_Entity_Name (Pref) | |
6318 | and then Present (Size_Clause (Entity (Pref)))) | |
6319 | or else | |
6320 | (Nkind (Pref) = N_Component_Clause | |
6321 | and then (Present (Component_Clause | |
6322 | (Entity (Selector_Name (Pref)))) | |
6323 | or else Is_Packed (Etype (Prefix (Pref))))) | |
6324 | or else | |
6325 | (Nkind (Pref) = N_Indexed_Component | |
36e38022 | 6326 | and then (Known_Component_Size (Etype (Prefix (Pref))) |
d8f43ee6 HK |
6327 | or else Is_Packed (Etype (Prefix (Pref))))) |
6328 | then | |
6329 | Set_Attribute_Name (N, Name_Size); | |
70482933 | 6330 | |
d8f43ee6 HK |
6331 | -- Otherwise if we have an object rather than a type, then |
6332 | -- the VADS_Size attribute applies to the type of the object, | |
6333 | -- rather than the object itself. This is one of the respects | |
6334 | -- in which VADS_Size differs from Size. | |
70482933 | 6335 | |
d8f43ee6 HK |
6336 | else |
6337 | if (not Is_Entity_Name (Pref) | |
6338 | or else not Is_Type (Entity (Pref))) | |
6339 | and then (Is_Scalar_Type (Ptyp) | |
6340 | or else Is_Constrained (Ptyp)) | |
6341 | then | |
6342 | Rewrite (Pref, New_Occurrence_Of (Ptyp, Loc)); | |
6343 | end if; | |
70482933 | 6344 | |
d8f43ee6 HK |
6345 | -- For a scalar type for which no size was explicitly given, |
6346 | -- VADS_Size means Object_Size. This is the other respect in | |
6347 | -- which VADS_Size differs from Size. | |
70482933 | 6348 | |
d8f43ee6 HK |
6349 | if Is_Scalar_Type (Ptyp) |
6350 | and then No (Size_Clause (Ptyp)) | |
6351 | then | |
6352 | Set_Attribute_Name (N, Name_Object_Size); | |
70482933 | 6353 | |
cb9d41eb | 6354 | -- In all other cases, Size and VADS_Size are the same |
70482933 | 6355 | |
d8f43ee6 HK |
6356 | else |
6357 | Set_Attribute_Name (N, Name_Size); | |
6358 | end if; | |
70482933 RK |
6359 | end if; |
6360 | end if; | |
70482933 | 6361 | |
d8f43ee6 HK |
6362 | -- If the prefix is X'Class, transform it into a direct reference |
6363 | -- to the class-wide type, because the back end must not see a | |
6364 | -- 'Class reference. | |
70482933 | 6365 | |
d8f43ee6 HK |
6366 | if Is_Entity_Name (Pref) |
6367 | and then Is_Class_Wide_Type (Entity (Pref)) | |
6368 | then | |
6369 | Rewrite (Prefix (N), New_Occurrence_Of (Entity (Pref), Loc)); | |
6370 | return; | |
fbf5a39b | 6371 | |
d8f43ee6 HK |
6372 | -- For X'Size applied to an object of a class-wide type, transform |
6373 | -- X'Size into a call to the primitive operation _Size applied to | |
6374 | -- X. | |
fbf5a39b | 6375 | |
d8f43ee6 | 6376 | elsif Is_Class_Wide_Type (Ptyp) then |
e23e04db | 6377 | |
d8f43ee6 HK |
6378 | -- No need to do anything else compiling under restriction |
6379 | -- No_Dispatching_Calls. During the semantic analysis we | |
6380 | -- already noted this restriction violation. | |
0669bebe | 6381 | |
d8f43ee6 HK |
6382 | if Restriction_Active (No_Dispatching_Calls) then |
6383 | return; | |
6384 | end if; | |
0669bebe | 6385 | |
d8f43ee6 HK |
6386 | New_Node := |
6387 | Make_Function_Call (Loc, | |
6388 | Name => | |
6389 | New_Occurrence_Of (Find_Prim_Op (Ptyp, Name_uSize), Loc), | |
6390 | Parameter_Associations => New_List (Pref)); | |
70482933 | 6391 | |
d8f43ee6 | 6392 | if Typ /= Standard_Long_Long_Integer then |
70482933 | 6393 | |
d8f43ee6 HK |
6394 | -- The context is a specific integer type with which the |
6395 | -- original attribute was compatible. The function has a | |
6396 | -- specific type as well, so to preserve the compatibility | |
6397 | -- we must convert explicitly. | |
70482933 | 6398 | |
d8f43ee6 HK |
6399 | New_Node := Convert_To (Typ, New_Node); |
6400 | end if; | |
70482933 | 6401 | |
d8f43ee6 HK |
6402 | Rewrite (N, New_Node); |
6403 | Analyze_And_Resolve (N, Typ); | |
6404 | return; | |
d8f43ee6 | 6405 | end if; |
70482933 | 6406 | |
d39f6b24 YM |
6407 | -- Call Expand_Size_Attribute to do the final part of the |
6408 | -- expansion which is shared with GNATprove expansion. | |
70482933 | 6409 | |
d39f6b24 | 6410 | Expand_Size_Attribute (N); |
d8f43ee6 | 6411 | end Size; |
70482933 | 6412 | |
70482933 RK |
6413 | ------------------ |
6414 | -- Storage_Size -- | |
6415 | ------------------ | |
6416 | ||
a8551b5f | 6417 | when Attribute_Storage_Size => Storage_Size : declare |
90cb252f | 6418 | Alloc_Op : Entity_Id := Empty; |
a8551b5f AC |
6419 | |
6420 | begin | |
70482933 | 6421 | |
70482933 RK |
6422 | -- Access type case, always go to the root type |
6423 | ||
6424 | -- The case of access types results in a value of zero for the case | |
6425 | -- where no storage size attribute clause has been given. If a | |
6426 | -- storage size has been given, then the attribute is converted | |
6427 | -- to a reference to the variable used to hold this value. | |
6428 | ||
6429 | if Is_Access_Type (Ptyp) then | |
6430 | if Present (Storage_Size_Variable (Root_Type (Ptyp))) then | |
6431 | Rewrite (N, | |
6a987d78 EB |
6432 | Convert_To (Typ, |
6433 | Make_Attribute_Reference (Loc, | |
6434 | Prefix => New_Occurrence_Of | |
6435 | (Etype (Storage_Size_Variable (Root_Type (Ptyp))), Loc), | |
6436 | Attribute_Name => Name_Max, | |
6437 | Expressions => New_List ( | |
6438 | Make_Integer_Literal (Loc, 0), | |
e4494292 | 6439 | New_Occurrence_Of |
70482933 RK |
6440 | (Storage_Size_Variable (Root_Type (Ptyp)), Loc))))); |
6441 | ||
6442 | elsif Present (Associated_Storage_Pool (Root_Type (Ptyp))) then | |
7ce611e2 | 6443 | |
a8551b5f AC |
6444 | -- If the access type is associated with a simple storage pool |
6445 | -- object, then attempt to locate the optional Storage_Size | |
6446 | -- function of the simple storage pool type. If not found, | |
6447 | -- then the result will default to zero. | |
6448 | ||
6449 | if Present (Get_Rep_Pragma (Root_Type (Ptyp), | |
f6205414 | 6450 | Name_Simple_Storage_Pool_Type)) |
a8551b5f AC |
6451 | then |
6452 | declare | |
6453 | Pool_Type : constant Entity_Id := | |
6454 | Base_Type (Etype (Entity (N))); | |
6455 | ||
6456 | begin | |
6457 | Alloc_Op := Get_Name_Entity_Id (Name_Storage_Size); | |
6458 | while Present (Alloc_Op) loop | |
6459 | if Scope (Alloc_Op) = Scope (Pool_Type) | |
6460 | and then Present (First_Formal (Alloc_Op)) | |
6461 | and then Etype (First_Formal (Alloc_Op)) = Pool_Type | |
6462 | then | |
6463 | exit; | |
6464 | end if; | |
6465 | ||
6466 | Alloc_Op := Homonym (Alloc_Op); | |
6467 | end loop; | |
6468 | end; | |
6469 | ||
6470 | -- In the normal Storage_Pool case, retrieve the primitive | |
6471 | -- function associated with the pool type. | |
6472 | ||
6473 | else | |
6474 | Alloc_Op := | |
6475 | Find_Prim_Op | |
6476 | (Etype (Associated_Storage_Pool (Root_Type (Ptyp))), | |
6477 | Attribute_Name (N)); | |
6478 | end if; | |
6479 | ||
6480 | -- If Storage_Size wasn't found (can only occur in the simple | |
6481 | -- storage pool case), then simply use zero for the result. | |
6482 | ||
6483 | if not Present (Alloc_Op) then | |
6484 | Rewrite (N, Make_Integer_Literal (Loc, 0)); | |
6485 | ||
6486 | -- Otherwise, rewrite the allocator as a call to pool type's | |
6487 | -- Storage_Size function. | |
6488 | ||
6489 | else | |
6490 | Rewrite (N, | |
6a987d78 | 6491 | Convert_To (Typ, |
a8551b5f AC |
6492 | Make_Function_Call (Loc, |
6493 | Name => | |
e4494292 | 6494 | New_Occurrence_Of (Alloc_Op, Loc), |
a8551b5f AC |
6495 | |
6496 | Parameter_Associations => New_List ( | |
e4494292 | 6497 | New_Occurrence_Of |
a8551b5f AC |
6498 | (Associated_Storage_Pool |
6499 | (Root_Type (Ptyp)), Loc))))); | |
6500 | end if; | |
70482933 | 6501 | |
70482933 RK |
6502 | else |
6503 | Rewrite (N, Make_Integer_Literal (Loc, 0)); | |
6504 | end if; | |
6505 | ||
6506 | Analyze_And_Resolve (N, Typ); | |
6507 | ||
7ce611e2 ES |
6508 | -- For tasks, we retrieve the size directly from the TCB. The |
6509 | -- size may depend on a discriminant of the type, and therefore | |
6510 | -- can be a per-object expression, so type-level information is | |
6511 | -- not sufficient in general. There are four cases to consider: | |
70482933 | 6512 | |
7ce611e2 ES |
6513 | -- a) If the attribute appears within a task body, the designated |
6514 | -- TCB is obtained by a call to Self. | |
70482933 | 6515 | |
7ce611e2 ES |
6516 | -- b) If the prefix of the attribute is the name of a task object, |
6517 | -- the designated TCB is the one stored in the corresponding record. | |
70482933 | 6518 | |
7ce611e2 ES |
6519 | -- c) If the prefix is a task type, the size is obtained from the |
6520 | -- size variable created for each task type | |
70482933 | 6521 | |
f145ece7 | 6522 | -- d) If no Storage_Size was specified for the type, there is no |
7ce611e2 | 6523 | -- size variable, and the value is a system-specific default. |
70482933 RK |
6524 | |
6525 | else | |
7ce611e2 ES |
6526 | if In_Open_Scopes (Ptyp) then |
6527 | ||
6528 | -- Storage_Size (Self) | |
6529 | ||
70482933 RK |
6530 | Rewrite (N, |
6531 | Convert_To (Typ, | |
6532 | Make_Function_Call (Loc, | |
6533 | Name => | |
7ce611e2 ES |
6534 | New_Occurrence_Of (RTE (RE_Storage_Size), Loc), |
6535 | Parameter_Associations => | |
6536 | New_List ( | |
6537 | Make_Function_Call (Loc, | |
6538 | Name => | |
e4494292 | 6539 | New_Occurrence_Of (RTE (RE_Self), Loc)))))); |
70482933 | 6540 | |
7ce611e2 ES |
6541 | elsif not Is_Entity_Name (Pref) |
6542 | or else not Is_Type (Entity (Pref)) | |
6543 | then | |
6544 | -- Storage_Size (Rec (Obj).Size) | |
6545 | ||
6546 | Rewrite (N, | |
6547 | Convert_To (Typ, | |
6548 | Make_Function_Call (Loc, | |
6549 | Name => | |
6550 | New_Occurrence_Of (RTE (RE_Storage_Size), Loc), | |
6551 | Parameter_Associations => | |
70482933 RK |
6552 | New_List ( |
6553 | Make_Selected_Component (Loc, | |
6554 | Prefix => | |
6555 | Unchecked_Convert_To ( | |
6556 | Corresponding_Record_Type (Ptyp), | |
7ce611e2 | 6557 | New_Copy_Tree (Pref)), |
70482933 | 6558 | Selector_Name => |
7ce611e2 | 6559 | Make_Identifier (Loc, Name_uTask_Id)))))); |
70482933 | 6560 | |
7ce611e2 | 6561 | elsif Present (Storage_Size_Variable (Ptyp)) then |
70482933 | 6562 | |
f145ece7 | 6563 | -- Static Storage_Size pragma given for type: retrieve value |
7ce611e2 | 6564 | -- from its allocated storage variable. |
70482933 | 6565 | |
7ce611e2 ES |
6566 | Rewrite (N, |
6567 | Convert_To (Typ, | |
6568 | Make_Function_Call (Loc, | |
6569 | Name => New_Occurrence_Of ( | |
6570 | RTE (RE_Adjust_Storage_Size), Loc), | |
6571 | Parameter_Associations => | |
6572 | New_List ( | |
e4494292 | 6573 | New_Occurrence_Of ( |
7ce611e2 ES |
6574 | Storage_Size_Variable (Ptyp), Loc))))); |
6575 | else | |
6576 | -- Get system default | |
6577 | ||
6578 | Rewrite (N, | |
6579 | Convert_To (Typ, | |
6580 | Make_Function_Call (Loc, | |
6581 | Name => | |
6582 | New_Occurrence_Of ( | |
6583 | RTE (RE_Default_Stack_Size), Loc)))); | |
70482933 | 6584 | end if; |
7ce611e2 ES |
6585 | |
6586 | Analyze_And_Resolve (N, Typ); | |
70482933 RK |
6587 | end if; |
6588 | end Storage_Size; | |
6589 | ||
82c80734 RD |
6590 | ----------------- |
6591 | -- Stream_Size -- | |
6592 | ----------------- | |
6593 | ||
9eea4346 GB |
6594 | when Attribute_Stream_Size => |
6595 | Rewrite (N, | |
6596 | Make_Integer_Literal (Loc, Intval => Get_Stream_Size (Ptyp))); | |
82c80734 | 6597 | Analyze_And_Resolve (N, Typ); |
82c80734 | 6598 | |
70482933 RK |
6599 | ---------- |
6600 | -- Succ -- | |
6601 | ---------- | |
6602 | ||
29049f0b AC |
6603 | -- 1. Deal with enumeration types with holes. |
6604 | -- 2. For floating-point, generate call to attribute function. | |
6605 | -- 3. For other cases, deal with constraint checking. | |
70482933 | 6606 | |
47d3b920 | 6607 | when Attribute_Succ => Succ : declare |
21d27997 | 6608 | Etyp : constant Entity_Id := Base_Type (Ptyp); |
70482933 RK |
6609 | |
6610 | begin | |
6611 | -- For enumeration types with non-standard representations, we | |
79e267f9 | 6612 | -- expand typ'Pred (x) into: |
70482933 RK |
6613 | |
6614 | -- Pos_To_Rep (Rep_To_Pos (x) + 1) | |
6615 | ||
79e267f9 EB |
6616 | -- if the representation is non-contiguous, and just x + 1 if it is |
6617 | -- after having dealt with constraint checking. | |
fbf5a39b | 6618 | |
79e267f9 | 6619 | if Is_Enumeration_Type (Etyp) |
21d27997 | 6620 | and then Present (Enum_Pos_To_Rep (Etyp)) |
70482933 | 6621 | then |
21d27997 | 6622 | if Has_Contiguous_Rep (Etyp) then |
79e267f9 EB |
6623 | if not Range_Checks_Suppressed (Ptyp) then |
6624 | Set_Do_Range_Check (First (Exprs), False); | |
6625 | Expand_Pred_Succ_Attribute (N); | |
6626 | end if; | |
6627 | ||
fbf5a39b | 6628 | Rewrite (N, |
79e267f9 EB |
6629 | Unchecked_Convert_To (Etyp, |
6630 | Make_Op_Add (Loc, | |
6631 | Left_Opnd => | |
c7c7dd3a EB |
6632 | Unchecked_Convert_To ( |
6633 | Integer_Type_For | |
6634 | (Esize (Etyp), Is_Unsigned_Type (Etyp)), | |
6635 | First (Exprs)), | |
79e267f9 EB |
6636 | Right_Opnd => |
6637 | Make_Integer_Literal (Loc, 1)))); | |
fbf5a39b | 6638 | |
fbf5a39b | 6639 | else |
16b54914 | 6640 | -- Add Boolean parameter True, to request program error if |
fbf5a39b AC |
6641 | -- we have a bad representation on our hands. Add False if |
6642 | -- checks are suppressed. | |
70482933 | 6643 | |
fbf5a39b AC |
6644 | Append_To (Exprs, Rep_To_Pos_Flag (Ptyp, Loc)); |
6645 | Rewrite (N, | |
6646 | Make_Indexed_Component (Loc, | |
21d27997 | 6647 | Prefix => |
e4494292 | 6648 | New_Occurrence_Of |
21d27997 | 6649 | (Enum_Pos_To_Rep (Etyp), Loc), |
fbf5a39b AC |
6650 | Expressions => New_List ( |
6651 | Make_Op_Add (Loc, | |
6652 | Left_Opnd => | |
6653 | Make_Function_Call (Loc, | |
6654 | Name => | |
e4494292 | 6655 | New_Occurrence_Of |
21d27997 | 6656 | (TSS (Etyp, TSS_Rep_To_Pos), Loc), |
fbf5a39b AC |
6657 | Parameter_Associations => Exprs), |
6658 | Right_Opnd => Make_Integer_Literal (Loc, 1))))); | |
6659 | end if; | |
70482933 | 6660 | |
79e267f9 EB |
6661 | -- Suppress checks since they have all been done above |
6662 | ||
6663 | Analyze_And_Resolve (N, Typ, Suppress => All_Checks); | |
70482933 RK |
6664 | |
6665 | -- For floating-point, we transform 'Succ into a call to the Succ | |
6666 | -- floating-point attribute function in Fat_xxx (xxx is root type) | |
6667 | ||
6668 | elsif Is_Floating_Point_Type (Ptyp) then | |
6669 | Expand_Fpt_Attribute_R (N); | |
6670 | Analyze_And_Resolve (N, Typ); | |
6671 | ||
6672 | -- For modular types, nothing to do (no overflow, since wraps) | |
6673 | ||
6674 | elsif Is_Modular_Integer_Type (Ptyp) then | |
6675 | null; | |
6676 | ||
d79e621a GD |
6677 | -- For other types, if argument is marked as needing a range check or |
6678 | -- overflow checking is enabled, we must generate a check. | |
70482933 | 6679 | |
d79e621a GD |
6680 | elsif not Overflow_Checks_Suppressed (Ptyp) |
6681 | or else Do_Range_Check (First (Exprs)) | |
6682 | then | |
6683 | Set_Do_Range_Check (First (Exprs), False); | |
aa9b151a | 6684 | Expand_Pred_Succ_Attribute (N); |
70482933 RK |
6685 | end if; |
6686 | end Succ; | |
6687 | ||
6688 | --------- | |
6689 | -- Tag -- | |
6690 | --------- | |
6691 | ||
6692 | -- Transforms X'Tag into a direct reference to the tag of X | |
6693 | ||
47d3b920 | 6694 | when Attribute_Tag => Tag : declare |
70482933 RK |
6695 | Ttyp : Entity_Id; |
6696 | Prefix_Is_Type : Boolean; | |
6697 | ||
6698 | begin | |
6699 | if Is_Entity_Name (Pref) and then Is_Type (Entity (Pref)) then | |
6700 | Ttyp := Entity (Pref); | |
6701 | Prefix_Is_Type := True; | |
6702 | else | |
21d27997 | 6703 | Ttyp := Ptyp; |
70482933 RK |
6704 | Prefix_Is_Type := False; |
6705 | end if; | |
6706 | ||
a252a471 JS |
6707 | -- In the case of a class-wide equivalent type without a parent, |
6708 | -- the _Tag component has been built in Make_CW_Equivalent_Type | |
6709 | -- manually and must be referenced directly. | |
6710 | ||
6711 | if Ekind (Ttyp) = E_Class_Wide_Subtype | |
6712 | and then Present (Equivalent_Type (Ttyp)) | |
6713 | and then No (Parent_Subtype (Equivalent_Type (Ttyp))) | |
6714 | then | |
6715 | Ttyp := Equivalent_Type (Ttyp); | |
6716 | ||
6717 | -- In all the other cases of class-wide type, including an equivalent | |
6718 | -- type with a parent, the _Tag component ultimately present is that | |
6719 | -- of the root type. | |
6720 | ||
6721 | elsif Is_Class_Wide_Type (Ttyp) then | |
70482933 RK |
6722 | Ttyp := Root_Type (Ttyp); |
6723 | end if; | |
6724 | ||
6725 | Ttyp := Underlying_Type (Ttyp); | |
6726 | ||
8a78c50d AC |
6727 | -- Ada 2005: The type may be a synchronized tagged type, in which |
6728 | -- case the tag information is stored in the corresponding record. | |
6729 | ||
6730 | if Is_Concurrent_Type (Ttyp) then | |
6731 | Ttyp := Corresponding_Record_Type (Ttyp); | |
6732 | end if; | |
6733 | ||
70482933 | 6734 | if Prefix_Is_Type then |
3a77b68d | 6735 | |
31104818 | 6736 | -- For VMs we leave the type attribute unexpanded because |
3a77b68d GB |
6737 | -- there's not a dispatching table to reference. |
6738 | ||
1f110335 | 6739 | if Tagged_Type_Expansion then |
3a77b68d GB |
6740 | Rewrite (N, |
6741 | Unchecked_Convert_To (RTE (RE_Tag), | |
e4494292 | 6742 | New_Occurrence_Of |
a9d8907c | 6743 | (Node (First_Elmt (Access_Disp_Table (Ttyp))), Loc))); |
3a77b68d GB |
6744 | Analyze_And_Resolve (N, RTE (RE_Tag)); |
6745 | end if; | |
70482933 | 6746 | |
934a3a25 | 6747 | -- Ada 2005 (AI-251): The use of 'Tag in the sources always |
31104818 HK |
6748 | -- references the primary tag of the actual object. If 'Tag is |
6749 | -- applied to class-wide interface objects we generate code that | |
6750 | -- displaces "this" to reference the base of the object. | |
6751 | ||
6752 | elsif Comes_From_Source (N) | |
6753 | and then Is_Class_Wide_Type (Etype (Prefix (N))) | |
63a5b3dc | 6754 | and then Is_Interface (Underlying_Type (Etype (Prefix (N)))) |
31104818 HK |
6755 | then |
6756 | -- Generate: | |
6757 | -- (To_Tag_Ptr (Prefix'Address)).all | |
6758 | ||
6759 | -- Note that Prefix'Address is recursively expanded into a call | |
6760 | -- to Base_Address (Obj.Tag) | |
6761 | ||
470cd9e9 RD |
6762 | -- Not needed for VM targets, since all handled by the VM |
6763 | ||
1f110335 | 6764 | if Tagged_Type_Expansion then |
470cd9e9 RD |
6765 | Rewrite (N, |
6766 | Make_Explicit_Dereference (Loc, | |
6767 | Unchecked_Convert_To (RTE (RE_Tag_Ptr), | |
6768 | Make_Attribute_Reference (Loc, | |
6769 | Prefix => Relocate_Node (Pref), | |
6770 | Attribute_Name => Name_Address)))); | |
6771 | Analyze_And_Resolve (N, RTE (RE_Tag)); | |
6772 | end if; | |
31104818 | 6773 | |
70482933 RK |
6774 | else |
6775 | Rewrite (N, | |
6776 | Make_Selected_Component (Loc, | |
6777 | Prefix => Relocate_Node (Pref), | |
6778 | Selector_Name => | |
e4494292 | 6779 | New_Occurrence_Of (First_Tag_Component (Ttyp), Loc))); |
3a77b68d | 6780 | Analyze_And_Resolve (N, RTE (RE_Tag)); |
70482933 | 6781 | end if; |
70482933 RK |
6782 | end Tag; |
6783 | ||
6784 | ---------------- | |
6785 | -- Terminated -- | |
6786 | ---------------- | |
6787 | ||
758c442c | 6788 | -- Transforms 'Terminated attribute into a call to Terminated function |
70482933 | 6789 | |
d8f43ee6 HK |
6790 | when Attribute_Terminated => Terminated : begin |
6791 | ||
65f01153 RD |
6792 | -- The prefix of Terminated is of a task interface class-wide type. |
6793 | -- Generate: | |
31e358e1 | 6794 | -- terminated (Task_Id (_disp_get_task_id (Pref))); |
65f01153 | 6795 | |
0791fbe9 | 6796 | if Ada_Version >= Ada_2005 |
21d27997 RD |
6797 | and then Ekind (Ptyp) = E_Class_Wide_Type |
6798 | and then Is_Interface (Ptyp) | |
6799 | and then Is_Task_Interface (Ptyp) | |
65f01153 | 6800 | then |
99bba92c AC |
6801 | Rewrite (N, |
6802 | Make_Function_Call (Loc, | |
c0e938d0 | 6803 | Name => |
99bba92c AC |
6804 | New_Occurrence_Of (RTE (RE_Terminated), Loc), |
6805 | Parameter_Associations => New_List ( | |
738a0e8d BD |
6806 | Unchecked_Convert_To |
6807 | (RTE (RO_ST_Task_Id), | |
6808 | Build_Disp_Get_Task_Id_Call (Pref))))); | |
65f01153 RD |
6809 | |
6810 | elsif Restricted_Profile then | |
70482933 RK |
6811 | Rewrite (N, |
6812 | Build_Call_With_Task (Pref, RTE (RE_Restricted_Terminated))); | |
6813 | ||
6814 | else | |
6815 | Rewrite (N, | |
6816 | Build_Call_With_Task (Pref, RTE (RE_Terminated))); | |
6817 | end if; | |
6818 | ||
6819 | Analyze_And_Resolve (N, Standard_Boolean); | |
6820 | end Terminated; | |
6821 | ||
6822 | ---------------- | |
6823 | -- To_Address -- | |
6824 | ---------------- | |
6825 | ||
1b0b0f18 | 6826 | -- Transforms System'To_Address (X) and System.Address'Ref (X) into |
1e3c434f BD |
6827 | -- unchecked conversion from (integral) type of X to type address. If |
6828 | -- the To_Address is a static expression, the transformed expression | |
6829 | -- also needs to be static, because we do some legality checks (e.g. | |
6830 | -- for Thread_Local_Storage) after this transformation. | |
70482933 | 6831 | |
89beb653 HK |
6832 | when Attribute_Ref |
6833 | | Attribute_To_Address | |
6834 | => | |
6835 | To_Address : declare | |
6836 | Is_Static : constant Boolean := Is_Static_Expression (N); | |
6837 | ||
6838 | begin | |
6839 | Rewrite (N, | |
6840 | Unchecked_Convert_To (RTE (RE_Address), | |
6841 | Relocate_Node (First (Exprs)))); | |
6842 | Set_Is_Static_Expression (N, Is_Static); | |
6843 | ||
6844 | Analyze_And_Resolve (N, RTE (RE_Address)); | |
6845 | end To_Address; | |
70482933 | 6846 | |
54838d1f AC |
6847 | ------------ |
6848 | -- To_Any -- | |
6849 | ------------ | |
6850 | ||
6851 | when Attribute_To_Any => To_Any : declare | |
90cb252f | 6852 | Decls : constant List_Id := New_List; |
54838d1f AC |
6853 | begin |
6854 | Rewrite (N, | |
6855 | Build_To_Any_Call | |
30ebb114 | 6856 | (Loc, |
10e168cd | 6857 | Convert_To (Ptyp, |
54838d1f AC |
6858 | Relocate_Node (First (Exprs))), Decls)); |
6859 | Insert_Actions (N, Decls); | |
6860 | Analyze_And_Resolve (N, RTE (RE_Any)); | |
6861 | end To_Any; | |
6862 | ||
70482933 RK |
6863 | ---------------- |
6864 | -- Truncation -- | |
6865 | ---------------- | |
6866 | ||
6867 | -- Transforms 'Truncation into a call to the floating-point attribute | |
0669bebe GB |
6868 | -- function Truncation in Fat_xxx (where xxx is the root type). |
6869 | -- Expansion is avoided for cases the back end can handle directly. | |
70482933 RK |
6870 | |
6871 | when Attribute_Truncation => | |
0669bebe GB |
6872 | if not Is_Inline_Floating_Point_Attribute (N) then |
6873 | Expand_Fpt_Attribute_R (N); | |
6874 | end if; | |
70482933 | 6875 | |
54838d1f AC |
6876 | -------------- |
6877 | -- TypeCode -- | |
6878 | -------------- | |
6879 | ||
6880 | when Attribute_TypeCode => TypeCode : declare | |
90cb252f | 6881 | Decls : constant List_Id := New_List; |
54838d1f | 6882 | begin |
10e168cd | 6883 | Rewrite (N, Build_TypeCode_Call (Loc, Ptyp, Decls)); |
54838d1f AC |
6884 | Insert_Actions (N, Decls); |
6885 | Analyze_And_Resolve (N, RTE (RE_TypeCode)); | |
6886 | end TypeCode; | |
6887 | ||
70482933 RK |
6888 | ----------------------- |
6889 | -- Unbiased_Rounding -- | |
6890 | ----------------------- | |
6891 | ||
6892 | -- Transforms 'Unbiased_Rounding into a call to the floating-point | |
6893 | -- attribute function Unbiased_Rounding in Fat_xxx (where xxx is the | |
0669bebe GB |
6894 | -- root type). Expansion is avoided for cases the back end can handle |
6895 | -- directly. | |
70482933 RK |
6896 | |
6897 | when Attribute_Unbiased_Rounding => | |
0669bebe GB |
6898 | if not Is_Inline_Floating_Point_Attribute (N) then |
6899 | Expand_Fpt_Attribute_R (N); | |
6900 | end if; | |
70482933 | 6901 | |
18a2ad5d AC |
6902 | ------------ |
6903 | -- Update -- | |
6904 | ------------ | |
6905 | ||
6906 | when Attribute_Update => | |
6907 | Expand_Update_Attribute (N); | |
6908 | ||
70482933 RK |
6909 | --------------- |
6910 | -- VADS_Size -- | |
6911 | --------------- | |
6912 | ||
6913 | -- The processing for VADS_Size is shared with Size | |
6914 | ||
6915 | --------- | |
6916 | -- Val -- | |
6917 | --------- | |
6918 | ||
10e168cd EB |
6919 | -- For enumeration types with a non-standard representation we use the |
6920 | -- _Pos_To_Rep array that was created when the type was frozen, unless | |
6921 | -- the representation is contiguous in which case we use an addition. | |
6922 | ||
f193b29e EB |
6923 | -- For enumeration types with a standard representation, Val can be |
6924 | -- rewritten as a simple conversion with Conversion_OK set. | |
6925 | ||
10e168cd EB |
6926 | -- For integer types, Val is equivalent to a simple integer conversion |
6927 | -- and we rewrite it as such. | |
70482933 | 6928 | |
47d3b920 | 6929 | when Attribute_Val => Val : declare |
10e168cd EB |
6930 | Etyp : constant Entity_Id := Base_Type (Ptyp); |
6931 | Expr : constant Node_Id := First (Exprs); | |
79e267f9 | 6932 | Rtyp : Entity_Id; |
70482933 RK |
6933 | |
6934 | begin | |
10e168cd | 6935 | -- Case of enumeration type |
fbf5a39b | 6936 | |
10e168cd EB |
6937 | if Is_Enumeration_Type (Etyp) then |
6938 | ||
79e267f9 | 6939 | -- Non-contiguous non-standard enumeration type |
10e168cd | 6940 | |
79e267f9 EB |
6941 | if Present (Enum_Pos_To_Rep (Etyp)) |
6942 | and then not Has_Contiguous_Rep (Etyp) | |
6943 | then | |
6944 | Rewrite (N, | |
6945 | Make_Indexed_Component (Loc, | |
6946 | Prefix => | |
6947 | New_Occurrence_Of (Enum_Pos_To_Rep (Etyp), Loc), | |
6948 | Expressions => New_List ( | |
6949 | Convert_To (Standard_Integer, Expr)))); | |
10e168cd | 6950 | |
79e267f9 | 6951 | Analyze_And_Resolve (N, Typ); |
10e168cd | 6952 | |
79e267f9 | 6953 | -- Standard or contiguous non-standard enumeration type |
fbf5a39b | 6954 | |
79e267f9 EB |
6955 | else |
6956 | -- If the argument is marked as requiring a range check then | |
6957 | -- generate it here, after looking through a conversion to | |
6958 | -- universal integer, if any. | |
6959 | ||
6960 | if Do_Range_Check (Expr) then | |
6961 | if Present (Enum_Pos_To_Rep (Etyp)) then | |
6962 | Rtyp := Enum_Pos_To_Rep (Etyp); | |
6963 | else | |
6964 | Rtyp := Etyp; | |
6965 | end if; | |
70482933 | 6966 | |
79e267f9 EB |
6967 | if Nkind (Expr) = N_Type_Conversion |
6968 | and then Entity (Subtype_Mark (Expr)) = Universal_Integer | |
6969 | then | |
6970 | Generate_Range_Check | |
6971 | (Expression (Expr), Rtyp, CE_Range_Check_Failed); | |
10e168cd | 6972 | |
79e267f9 EB |
6973 | else |
6974 | Generate_Range_Check (Expr, Rtyp, CE_Range_Check_Failed); | |
6975 | end if; | |
10e168cd | 6976 | |
10e168cd | 6977 | Set_Do_Range_Check (Expr, False); |
79e267f9 | 6978 | end if; |
d79e621a | 6979 | |
79e267f9 EB |
6980 | -- Contiguous non-standard enumeration type |
6981 | ||
6982 | if Present (Enum_Pos_To_Rep (Etyp)) then | |
79e267f9 EB |
6983 | Rewrite (N, |
6984 | Unchecked_Convert_To (Etyp, | |
6985 | Make_Op_Add (Loc, | |
6986 | Left_Opnd => | |
6987 | Make_Integer_Literal (Loc, | |
6988 | Enumeration_Rep (First_Literal (Etyp))), | |
6989 | Right_Opnd => | |
c7c7dd3a EB |
6990 | Unchecked_Convert_To ( |
6991 | Integer_Type_For | |
6992 | (Esize (Etyp), Is_Unsigned_Type (Etyp)), | |
6993 | Expr)))); | |
79e267f9 | 6994 | |
f193b29e | 6995 | -- Standard enumeration type |
79e267f9 | 6996 | |
f193b29e EB |
6997 | else |
6998 | Rewrite (N, OK_Convert_To (Typ, Expr)); | |
10e168cd | 6999 | end if; |
f193b29e EB |
7000 | |
7001 | -- Suppress checks since the range check was done above | |
7002 | -- and it guarantees that the addition cannot overflow. | |
7003 | ||
7004 | Analyze_And_Resolve (N, Typ, Suppress => All_Checks); | |
10e168cd | 7005 | end if; |
d79e621a | 7006 | |
10e168cd EB |
7007 | -- Deal with integer types |
7008 | ||
7009 | elsif Is_Integer_Type (Etyp) then | |
7010 | Rewrite (N, Convert_To (Typ, Expr)); | |
7011 | Analyze_And_Resolve (N, Typ); | |
70482933 RK |
7012 | end if; |
7013 | end Val; | |
7014 | ||
7015 | ----------- | |
7016 | -- Valid -- | |
7017 | ----------- | |
7018 | ||
7019 | -- The code for valid is dependent on the particular types involved. | |
7020 | -- See separate sections below for the generated code in each case. | |
7021 | ||
47d3b920 | 7022 | when Attribute_Valid => Valid : declare |
382b0e97 | 7023 | PBtyp : Entity_Id := Base_Type (Ptyp); |
70482933 | 7024 | |
fbf5a39b AC |
7025 | Save_Validity_Checks_On : constant Boolean := Validity_Checks_On; |
7026 | -- Save the validity checking mode. We always turn off validity | |
7027 | -- checking during process of 'Valid since this is one place | |
9e40de1d | 7028 | -- where we do not want the implicit validity checks to interfere |
fbf5a39b AC |
7029 | -- with the explicit validity check that the programmer is doing. |
7030 | ||
70482933 RK |
7031 | function Make_Range_Test return Node_Id; |
7032 | -- Build the code for a range test of the form | |
382b0e97 | 7033 | -- PBtyp!(Pref) in PBtyp!(Ptyp'First) .. PBtyp!(Ptyp'Last) |
70482933 | 7034 | |
fbf5a39b AC |
7035 | --------------------- |
7036 | -- Make_Range_Test -- | |
7037 | --------------------- | |
7038 | ||
70482933 | 7039 | function Make_Range_Test return Node_Id is |
89b6c83e | 7040 | Temp : Node_Id; |
dbf04430 | 7041 | |
70482933 | 7042 | begin |
89b6c83e AC |
7043 | -- The prefix of attribute 'Valid should always denote an object |
7044 | -- reference. The reference is either coming directly from source | |
5168a9b3 PMR |
7045 | -- or is produced by validity check expansion. The object may be |
7046 | -- wrapped in a conversion in which case the call to Unqual_Conv | |
7047 | -- will yield it. | |
dbf04430 | 7048 | |
89b6c83e AC |
7049 | -- If the prefix denotes a variable which captures the value of |
7050 | -- an object for validation purposes, use the variable in the | |
7051 | -- range test. This ensures that no extra copies or extra reads | |
7052 | -- are produced as part of the test. Generate: | |
7053 | ||
7054 | -- Temp : ... := Object; | |
7055 | -- if not Temp in ... then | |
7056 | ||
7057 | if Is_Validation_Variable_Reference (Pref) then | |
5168a9b3 | 7058 | Temp := New_Occurrence_Of (Entity (Unqual_Conv (Pref)), Loc); |
89b6c83e AC |
7059 | |
7060 | -- Otherwise the prefix is either a source object or a constant | |
7061 | -- produced by validity check expansion. Generate: | |
7062 | ||
7063 | -- Temp : constant ... := Pref; | |
7064 | -- if not Temp in ... then | |
7065 | ||
7066 | else | |
7067 | Temp := Duplicate_Subexpr (Pref); | |
dbf04430 AC |
7068 | end if; |
7069 | ||
70482933 | 7070 | return |
ea034236 | 7071 | Make_In (Loc, |
382b0e97 | 7072 | Left_Opnd => Unchecked_Convert_To (PBtyp, Temp), |
ea034236 AC |
7073 | Right_Opnd => |
7074 | Make_Range (Loc, | |
89b6c83e | 7075 | Low_Bound => |
382b0e97 | 7076 | Unchecked_Convert_To (PBtyp, |
70482933 | 7077 | Make_Attribute_Reference (Loc, |
89b6c83e | 7078 | Prefix => New_Occurrence_Of (Ptyp, Loc), |
ea034236 AC |
7079 | Attribute_Name => Name_First)), |
7080 | High_Bound => | |
382b0e97 | 7081 | Unchecked_Convert_To (PBtyp, |
70482933 | 7082 | Make_Attribute_Reference (Loc, |
89b6c83e | 7083 | Prefix => New_Occurrence_Of (Ptyp, Loc), |
70482933 RK |
7084 | Attribute_Name => Name_Last)))); |
7085 | end Make_Range_Test; | |
7086 | ||
f16cb8df HK |
7087 | -- Local variables |
7088 | ||
7089 | Tst : Node_Id; | |
7090 | ||
70482933 RK |
7091 | -- Start of processing for Attribute_Valid |
7092 | ||
7093 | begin | |
1d57c04f AC |
7094 | -- Do not expand sourced code 'Valid reference in CodePeer mode, |
7095 | -- will be handled by the back-end directly. | |
7096 | ||
7097 | if CodePeer_Mode and then Comes_From_Source (N) then | |
7098 | return; | |
7099 | end if; | |
7100 | ||
fbf5a39b AC |
7101 | -- Turn off validity checks. We do not want any implicit validity |
7102 | -- checks to intefere with the explicit check from the attribute | |
7103 | ||
7104 | Validity_Checks_On := False; | |
7105 | ||
d7a44b14 AC |
7106 | -- Retrieve the base type. Handle the case where the base type is a |
7107 | -- private enumeration type. | |
7108 | ||
382b0e97 BD |
7109 | if Is_Private_Type (PBtyp) and then Present (Full_View (PBtyp)) then |
7110 | PBtyp := Full_View (PBtyp); | |
d7a44b14 AC |
7111 | end if; |
7112 | ||
70482933 RK |
7113 | -- Floating-point case. This case is handled by the Valid attribute |
7114 | -- code in the floating-point attribute run-time library. | |
7115 | ||
7116 | if Is_Floating_Point_Type (Ptyp) then | |
dfaff97b | 7117 | Float_Valid : declare |
65f01153 RD |
7118 | Pkg : RE_Id; |
7119 | Ftp : Entity_Id; | |
70482933 | 7120 | |
8575023c AC |
7121 | function Get_Fat_Entity (Nam : Name_Id) return Entity_Id; |
7122 | -- Return entity for Pkg.Nam | |
7123 | ||
7124 | -------------------- | |
7125 | -- Get_Fat_Entity -- | |
7126 | -------------------- | |
7127 | ||
7128 | function Get_Fat_Entity (Nam : Name_Id) return Entity_Id is | |
7129 | Exp_Name : constant Node_Id := | |
7130 | Make_Selected_Component (Loc, | |
7131 | Prefix => New_Occurrence_Of (RTE (Pkg), Loc), | |
7132 | Selector_Name => Make_Identifier (Loc, Nam)); | |
7133 | begin | |
7134 | Find_Selected_Component (Exp_Name); | |
7135 | return Entity (Exp_Name); | |
7136 | end Get_Fat_Entity; | |
7137 | ||
dfaff97b RD |
7138 | -- Start of processing for Float_Valid |
7139 | ||
70482933 | 7140 | begin |
9324e07d | 7141 | -- The C back end handles Valid for floating-point types |
8575023c | 7142 | |
9324e07d | 7143 | if Modify_Tree_For_C then |
88438c0e AC |
7144 | Analyze_And_Resolve (Pref, Ptyp); |
7145 | Set_Etype (N, Standard_Boolean); | |
7146 | Set_Analyzed (N); | |
8575023c | 7147 | |
88438c0e AC |
7148 | else |
7149 | Find_Fat_Info (Ptyp, Ftp, Pkg); | |
7150 | ||
7151 | -- If the prefix is a reverse SSO component, or is possibly | |
7152 | -- unaligned, first create a temporary copy that is in | |
7153 | -- native SSO, and properly aligned. Make it Volatile to | |
7154 | -- prevent folding in the back-end. Note that we use an | |
7155 | -- intermediate constrained string type to initialize the | |
7156 | -- temporary, as the value at hand might be invalid, and in | |
7157 | -- that case it cannot be copied using a floating point | |
7158 | -- register. | |
7159 | ||
7160 | if In_Reverse_Storage_Order_Object (Pref) | |
7161 | or else Is_Possibly_Unaligned_Object (Pref) | |
7162 | then | |
7163 | declare | |
7164 | Temp : constant Entity_Id := | |
7165 | Make_Temporary (Loc, 'F'); | |
7166 | ||
7167 | Fat_S : constant Entity_Id := | |
7168 | Get_Fat_Entity (Name_S); | |
7169 | -- Constrained string subtype of appropriate size | |
7170 | ||
7171 | Fat_P : constant Entity_Id := | |
7172 | Get_Fat_Entity (Name_P); | |
7173 | -- Access to Fat_S | |
7174 | ||
7175 | Decl : constant Node_Id := | |
7176 | Make_Object_Declaration (Loc, | |
7177 | Defining_Identifier => Temp, | |
7178 | Aliased_Present => True, | |
7179 | Object_Definition => | |
7180 | New_Occurrence_Of (Ptyp, Loc)); | |
7181 | ||
7182 | begin | |
7183 | Set_Aspect_Specifications (Decl, New_List ( | |
7184 | Make_Aspect_Specification (Loc, | |
7185 | Identifier => | |
7186 | Make_Identifier (Loc, Name_Volatile)))); | |
7187 | ||
7188 | Insert_Actions (N, | |
7189 | New_List ( | |
7190 | Decl, | |
7191 | ||
7192 | Make_Assignment_Statement (Loc, | |
7193 | Name => | |
7194 | Make_Explicit_Dereference (Loc, | |
7195 | Prefix => | |
7196 | Unchecked_Convert_To (Fat_P, | |
7197 | Make_Attribute_Reference (Loc, | |
7198 | Prefix => | |
7199 | New_Occurrence_Of (Temp, Loc), | |
7200 | Attribute_Name => | |
7201 | Name_Unrestricted_Access))), | |
7202 | Expression => | |
7203 | Unchecked_Convert_To (Fat_S, | |
7204 | Relocate_Node (Pref)))), | |
7205 | ||
7206 | Suppress => All_Checks); | |
7207 | ||
7208 | Rewrite (Pref, New_Occurrence_Of (Temp, Loc)); | |
7209 | end; | |
7210 | end if; | |
8575023c | 7211 | |
88438c0e AC |
7212 | -- We now have an object of the proper endianness and |
7213 | -- alignment, and can construct a Valid attribute. | |
74014283 | 7214 | |
88438c0e AC |
7215 | -- We make sure the prefix of this valid attribute is |
7216 | -- marked as not coming from source, to avoid losing | |
7217 | -- warnings from 'Valid looking like a possible update. | |
74014283 | 7218 | |
88438c0e | 7219 | Set_Comes_From_Source (Pref, False); |
8575023c | 7220 | |
88438c0e AC |
7221 | Expand_Fpt_Attribute |
7222 | (N, Pkg, Name_Valid, | |
7223 | New_List ( | |
7224 | Make_Attribute_Reference (Loc, | |
7225 | Prefix => Unchecked_Convert_To (Ftp, Pref), | |
7226 | Attribute_Name => Name_Unrestricted_Access))); | |
7227 | end if; | |
70482933 RK |
7228 | |
7229 | -- One more task, we still need a range check. Required | |
7230 | -- only if we have a constraint, since the Valid routine | |
7231 | -- catches infinities properly (infinities are never valid). | |
7232 | ||
7233 | -- The way we do the range check is simply to create the | |
7234 | -- expression: Valid (N) and then Base_Type(Pref) in Typ. | |
7235 | ||
382b0e97 | 7236 | if not Subtypes_Statically_Match (Ptyp, PBtyp) then |
70482933 RK |
7237 | Rewrite (N, |
7238 | Make_And_Then (Loc, | |
7239 | Left_Opnd => Relocate_Node (N), | |
7240 | Right_Opnd => | |
7241 | Make_In (Loc, | |
382b0e97 | 7242 | Left_Opnd => Convert_To (PBtyp, Pref), |
70482933 RK |
7243 | Right_Opnd => New_Occurrence_Of (Ptyp, Loc)))); |
7244 | end if; | |
dfaff97b | 7245 | end Float_Valid; |
70482933 RK |
7246 | |
7247 | -- Enumeration type with holes | |
7248 | ||
7249 | -- For enumeration types with holes, the Pos value constructed by | |
7250 | -- the Enum_Rep_To_Pos function built in Exp_Ch3 called with a | |
7251 | -- second argument of False returns minus one for an invalid value, | |
7252 | -- and the non-negative pos value for a valid value, so the | |
7253 | -- expansion of X'Valid is simply: | |
7254 | ||
7255 | -- type(X)'Pos (X) >= 0 | |
7256 | ||
7257 | -- We can't quite generate it that way because of the requirement | |
7324bf49 AC |
7258 | -- for the non-standard second argument of False in the resulting |
7259 | -- rep_to_pos call, so we have to explicitly create: | |
70482933 RK |
7260 | |
7261 | -- _rep_to_pos (X, False) >= 0 | |
7262 | ||
7263 | -- If we have an enumeration subtype, we also check that the | |
7264 | -- value is in range: | |
7265 | ||
7266 | -- _rep_to_pos (X, False) >= 0 | |
7267 | -- and then | |
7324bf49 | 7268 | -- (X >= type(X)'First and then type(X)'Last <= X) |
70482933 RK |
7269 | |
7270 | elsif Is_Enumeration_Type (Ptyp) | |
382b0e97 | 7271 | and then Present (Enum_Pos_To_Rep (PBtyp)) |
70482933 RK |
7272 | then |
7273 | Tst := | |
7274 | Make_Op_Ge (Loc, | |
7275 | Left_Opnd => | |
7276 | Make_Function_Call (Loc, | |
7277 | Name => | |
382b0e97 | 7278 | New_Occurrence_Of (TSS (PBtyp, TSS_Rep_To_Pos), Loc), |
70482933 RK |
7279 | Parameter_Associations => New_List ( |
7280 | Pref, | |
7281 | New_Occurrence_Of (Standard_False, Loc))), | |
7282 | Right_Opnd => Make_Integer_Literal (Loc, 0)); | |
7283 | ||
3b3bd801 AO |
7284 | -- Skip the range test for boolean types, as it buys us |
7285 | -- nothing. The function called above already fails for | |
7286 | -- values different from both True and False. | |
7287 | ||
7288 | if Ptyp /= PBtyp and then not Is_Boolean_Type (PBtyp) | |
70482933 | 7289 | and then |
382b0e97 | 7290 | (Type_Low_Bound (Ptyp) /= Type_Low_Bound (PBtyp) |
70482933 | 7291 | or else |
382b0e97 | 7292 | Type_High_Bound (Ptyp) /= Type_High_Bound (PBtyp)) |
70482933 RK |
7293 | then |
7294 | -- The call to Make_Range_Test will create declarations | |
7295 | -- that need a proper insertion point, but Pref is now | |
7296 | -- attached to a node with no ancestor. Attach to tree | |
7297 | -- even if it is to be rewritten below. | |
7298 | ||
7299 | Set_Parent (Tst, Parent (N)); | |
7300 | ||
7301 | Tst := | |
7302 | Make_And_Then (Loc, | |
7303 | Left_Opnd => Make_Range_Test, | |
7304 | Right_Opnd => Tst); | |
7305 | end if; | |
7306 | ||
7307 | Rewrite (N, Tst); | |
7308 | ||
7309 | -- Fortran convention booleans | |
7310 | ||
7311 | -- For the very special case of Fortran convention booleans, the | |
7312 | -- value is always valid, since it is an integer with the semantics | |
7313 | -- that non-zero is true, and any value is permissible. | |
7314 | ||
7315 | elsif Is_Boolean_Type (Ptyp) | |
7316 | and then Convention (Ptyp) = Convention_Fortran | |
7317 | then | |
7318 | Rewrite (N, New_Occurrence_Of (Standard_True, Loc)); | |
7319 | ||
7320 | -- For biased representations, we will be doing an unchecked | |
758c442c GD |
7321 | -- conversion without unbiasing the result. That means that the range |
7322 | -- test has to take this into account, and the proper form of the | |
7323 | -- test is: | |
70482933 | 7324 | |
382b0e97 | 7325 | -- PBtyp!(Pref) < PBtyp!(Ptyp'Range_Length) |
70482933 RK |
7326 | |
7327 | elsif Has_Biased_Representation (Ptyp) then | |
382b0e97 | 7328 | PBtyp := RTE (RE_Unsigned_32); |
70482933 RK |
7329 | Rewrite (N, |
7330 | Make_Op_Lt (Loc, | |
7331 | Left_Opnd => | |
382b0e97 | 7332 | Unchecked_Convert_To (PBtyp, Duplicate_Subexpr (Pref)), |
70482933 | 7333 | Right_Opnd => |
382b0e97 | 7334 | Unchecked_Convert_To (PBtyp, |
70482933 RK |
7335 | Make_Attribute_Reference (Loc, |
7336 | Prefix => New_Occurrence_Of (Ptyp, Loc), | |
7337 | Attribute_Name => Name_Range_Length)))); | |
7338 | ||
7339 | -- For all other scalar types, what we want logically is a | |
7340 | -- range test: | |
7341 | ||
7342 | -- X in type(X)'First .. type(X)'Last | |
7343 | ||
7344 | -- But that's precisely what won't work because of possible | |
7345 | -- unwanted optimization (and indeed the basic motivation for | |
a90bd866 | 7346 | -- the Valid attribute is exactly that this test does not work). |
70482933 RK |
7347 | -- What will work is: |
7348 | ||
382b0e97 | 7349 | -- PBtyp!(X) >= PBtyp!(type(X)'First) |
70482933 | 7350 | -- and then |
382b0e97 | 7351 | -- PBtyp!(X) <= PBtyp!(type(X)'Last) |
70482933 | 7352 | |
382b0e97 | 7353 | -- where PBtyp is an integer type large enough to cover the full |
70482933 RK |
7354 | -- range of possible stored values (i.e. it is chosen on the basis |
7355 | -- of the size of the type, not the range of the values). We write | |
7356 | -- this as two tests, rather than a range check, so that static | |
7357 | -- evaluation will easily remove either or both of the checks if | |
ce32ccfc | 7358 | -- they can be statically determined to be true (this happens |
70482933 RK |
7359 | -- when the type of X is static and the range extends to the full |
7360 | -- range of stored values). | |
7361 | ||
7362 | -- Unsigned types. Note: it is safe to consider only whether the | |
7363 | -- subtype is unsigned, since we will in that case be doing all | |
758c442c GD |
7364 | -- unsigned comparisons based on the subtype range. Since we use the |
7365 | -- actual subtype object size, this is appropriate. | |
70482933 RK |
7366 | |
7367 | -- For example, if we have | |
7368 | ||
7369 | -- subtype x is integer range 1 .. 200; | |
7370 | -- for x'Object_Size use 8; | |
7371 | ||
758c442c GD |
7372 | -- Now the base type is signed, but objects of this type are bits |
7373 | -- unsigned, and doing an unsigned test of the range 1 to 200 is | |
7374 | -- correct, even though a value greater than 127 looks signed to a | |
7375 | -- signed comparison. | |
70482933 | 7376 | |
70482933 | 7377 | else |
c7c7dd3a | 7378 | declare |
ce32ccfc AC |
7379 | Uns : constant Boolean := |
7380 | Is_Unsigned_Type (Ptyp) | |
7381 | or else (Is_Private_Type (Ptyp) | |
7382 | and then Is_Unsigned_Type (Btyp)); | |
7383 | Size : Uint; | |
7384 | P : Node_Id := Pref; | |
7385 | ||
c7c7dd3a | 7386 | begin |
76f9c7f4 | 7387 | -- If the prefix is an object, use the Esize from this object |
ce32ccfc AC |
7388 | -- to handle in a more user friendly way the case of objects |
7389 | -- or components with a large Size aspect: if a Size aspect is | |
7390 | -- specified, we want to read a scalar value as large as the | |
7391 | -- Size, unless the Size is larger than | |
7392 | -- System_Max_Integer_Size. | |
7393 | ||
7394 | if Nkind (P) = N_Selected_Component then | |
7395 | P := Selector_Name (P); | |
7396 | end if; | |
7397 | ||
7398 | if Nkind (P) in N_Has_Entity | |
7399 | and then Present (Entity (P)) | |
76f9c7f4 | 7400 | and then Is_Object (Entity (P)) |
b23cdc01 | 7401 | and then Known_Esize (Entity (P)) |
ce32ccfc AC |
7402 | then |
7403 | if Esize (Entity (P)) <= System_Max_Integer_Size then | |
7404 | Size := Esize (Entity (P)); | |
7405 | else | |
7406 | Size := UI_From_Int (System_Max_Integer_Size); | |
7407 | end if; | |
7408 | else | |
7409 | Size := Esize (Ptyp); | |
7410 | end if; | |
7411 | ||
7412 | PBtyp := Small_Integer_Type_For (Size, Uns); | |
c7c7dd3a EB |
7413 | Rewrite (N, Make_Range_Test); |
7414 | end; | |
70482933 RK |
7415 | end if; |
7416 | ||
3d6db7f8 GD |
7417 | -- If a predicate is present, then we do the predicate test, even if |
7418 | -- within the predicate function (infinite recursion is warned about | |
97948f41 | 7419 | -- in Sem_Attr in that case). |
3d6db7f8 GD |
7420 | |
7421 | declare | |
7422 | Pred_Func : constant Entity_Id := Predicate_Function (Ptyp); | |
7423 | ||
7424 | begin | |
7425 | if Present (Pred_Func) then | |
7426 | Rewrite (N, | |
7427 | Make_And_Then (Loc, | |
7428 | Left_Opnd => Relocate_Node (N), | |
7429 | Right_Opnd => Make_Predicate_Call (Ptyp, Pref))); | |
3d6db7f8 GD |
7430 | end if; |
7431 | end; | |
7432 | ||
70482933 | 7433 | Analyze_And_Resolve (N, Standard_Boolean); |
fbf5a39b | 7434 | Validity_Checks_On := Save_Validity_Checks_On; |
70482933 RK |
7435 | end Valid; |
7436 | ||
336438b6 BD |
7437 | ----------------- |
7438 | -- Valid_Value -- | |
7439 | ----------------- | |
7440 | ||
7441 | when Attribute_Valid_Value => | |
7442 | Exp_Imgv.Expand_Valid_Value_Attribute (N); | |
7443 | ||
2a1f6a1f AC |
7444 | ------------------- |
7445 | -- Valid_Scalars -- | |
7446 | ------------------- | |
7447 | ||
7448 | when Attribute_Valid_Scalars => Valid_Scalars : declare | |
7aaf6620 | 7449 | Val_Typ : constant Entity_Id := Validated_View (Ptyp); |
a4dafb8b | 7450 | Expr : Node_Id; |
99fc068e | 7451 | |
2a1f6a1f | 7452 | begin |
f16cb8df | 7453 | -- Assume that the prefix does not need validation |
99fc068e | 7454 | |
f16cb8df | 7455 | Expr := Empty; |
45ec05e1 | 7456 | |
d57f8e40 PT |
7457 | -- Attribute 'Valid_Scalars is not supported on private tagged types; |
7458 | -- see a detailed explanation where this attribute is analyzed. | |
99fc068e | 7459 | |
f16cb8df HK |
7460 | if Is_Private_Type (Ptyp) and then Is_Tagged_Type (Ptyp) then |
7461 | null; | |
99fc068e | 7462 | |
f16cb8df HK |
7463 | -- Attribute 'Valid_Scalars evaluates to True when the type lacks |
7464 | -- scalars. | |
99fc068e | 7465 | |
f16cb8df HK |
7466 | elsif not Scalar_Part_Present (Val_Typ) then |
7467 | null; | |
99fc068e | 7468 | |
f16cb8df HK |
7469 | -- Attribute 'Valid_Scalars is the same as attribute 'Valid when the |
7470 | -- validated type is a scalar type. Generate: | |
45ec05e1 | 7471 | |
f16cb8df | 7472 | -- Val_Typ (Pref)'Valid |
45ec05e1 | 7473 | |
f16cb8df HK |
7474 | elsif Is_Scalar_Type (Val_Typ) then |
7475 | Expr := | |
7476 | Make_Attribute_Reference (Loc, | |
7477 | Prefix => | |
7478 | Unchecked_Convert_To (Val_Typ, New_Copy_Tree (Pref)), | |
7479 | Attribute_Name => Name_Valid); | |
45ec05e1 | 7480 | |
efd0843d EB |
7481 | -- Required by LLVM although the sizes are the same??? |
7482 | ||
7483 | if Nkind (Prefix (Expr)) = N_Unchecked_Type_Conversion then | |
7484 | Set_No_Truncation (Prefix (Expr)); | |
7485 | end if; | |
7486 | ||
f16cb8df HK |
7487 | -- Validate the scalar components of an array by iterating over all |
7488 | -- dimensions of the array while checking individual components. | |
45ec05e1 | 7489 | |
f16cb8df | 7490 | elsif Is_Array_Type (Val_Typ) then |
a4dafb8b PT |
7491 | Expr := |
7492 | Make_Function_Call (Loc, | |
7493 | Name => | |
7494 | New_Occurrence_Of | |
7495 | (Build_Array_VS_Func | |
7496 | (Attr => N, | |
7497 | Formal_Typ => Ptyp, | |
7498 | Array_Typ => Val_Typ), | |
7499 | Loc), | |
7500 | Parameter_Associations => New_List (Pref)); | |
99fc068e | 7501 | |
f16cb8df HK |
7502 | -- Validate the scalar components, discriminants of a record type by |
7503 | -- examining the structure of a record type. | |
99fc068e | 7504 | |
f16cb8df HK |
7505 | elsif Is_Record_Type (Val_Typ) then |
7506 | Expr := | |
7507 | Make_Function_Call (Loc, | |
7508 | Name => | |
7509 | New_Occurrence_Of | |
7510 | (Build_Record_VS_Func | |
7511 | (Attr => N, | |
7512 | Formal_Typ => Ptyp, | |
7aaf6620 | 7513 | Rec_Typ => Val_Typ), |
f16cb8df HK |
7514 | Loc), |
7515 | Parameter_Associations => New_List (Pref)); | |
7516 | end if; | |
99fc068e | 7517 | |
f16cb8df HK |
7518 | -- Default the attribute to True when the type of the prefix does not |
7519 | -- need validation. | |
99fc068e | 7520 | |
f16cb8df HK |
7521 | if No (Expr) then |
7522 | Expr := New_Occurrence_Of (Standard_True, Loc); | |
99fc068e | 7523 | end if; |
45ec05e1 | 7524 | |
f16cb8df | 7525 | Rewrite (N, Expr); |
45ec05e1 RD |
7526 | Analyze_And_Resolve (N, Standard_Boolean); |
7527 | Set_Is_Static_Expression (N, False); | |
2a1f6a1f AC |
7528 | end Valid_Scalars; |
7529 | ||
70482933 RK |
7530 | ----------- |
7531 | -- Value -- | |
7532 | ----------- | |
7533 | ||
70482933 RK |
7534 | when Attribute_Value => |
7535 | Exp_Imgv.Expand_Value_Attribute (N); | |
7536 | ||
7537 | ----------------- | |
7538 | -- Value_Size -- | |
7539 | ----------------- | |
7540 | ||
7541 | -- The processing for Value_Size shares the processing for Size | |
7542 | ||
7543 | ------------- | |
7544 | -- Version -- | |
7545 | ------------- | |
7546 | ||
7547 | -- The processing for Version shares the processing for Body_Version | |
7548 | ||
7549 | ---------------- | |
7550 | -- Wide_Image -- | |
7551 | ---------------- | |
7552 | ||
470cd9e9 | 7553 | when Attribute_Wide_Image => |
b63d61f7 AC |
7554 | -- Leave attribute unexpanded in CodePeer mode: the gnat2scil |
7555 | -- back-end knows how to handle this attribute directly. | |
7556 | ||
7557 | if CodePeer_Mode then | |
7558 | return; | |
7559 | end if; | |
7560 | ||
470cd9e9 | 7561 | Exp_Imgv.Expand_Wide_Image_Attribute (N); |
70482933 | 7562 | |
82c80734 RD |
7563 | --------------------- |
7564 | -- Wide_Wide_Image -- | |
7565 | --------------------- | |
7566 | ||
470cd9e9 | 7567 | when Attribute_Wide_Wide_Image => |
b63d61f7 AC |
7568 | -- Leave attribute unexpanded in CodePeer mode: the gnat2scil |
7569 | -- back-end knows how to handle this attribute directly. | |
7570 | ||
7571 | if CodePeer_Mode then | |
7572 | return; | |
7573 | end if; | |
7574 | ||
470cd9e9 | 7575 | Exp_Imgv.Expand_Wide_Wide_Image_Attribute (N); |
82c80734 | 7576 | |
70482933 RK |
7577 | ---------------- |
7578 | -- Wide_Value -- | |
7579 | ---------------- | |
7580 | ||
7581 | -- We expand typ'Wide_Value (X) into | |
7582 | ||
7583 | -- typ'Value | |
7584 | -- (Wide_String_To_String (X, Wide_Character_Encoding_Method)) | |
7585 | ||
7586 | -- Wide_String_To_String is a runtime function that converts its wide | |
7587 | -- string argument to String, converting any non-translatable characters | |
7588 | -- into appropriate escape sequences. This preserves the required | |
7589 | -- semantics of Wide_Value in all cases, and results in a very simple | |
7590 | -- implementation approach. | |
7591 | ||
7ce611e2 ES |
7592 | -- Note: for this approach to be fully standard compliant for the cases |
7593 | -- where typ is Wide_Character and Wide_Wide_Character, the encoding | |
7594 | -- method must cover the entire character range (e.g. UTF-8). But that | |
7595 | -- is a reasonable requirement when dealing with encoded character | |
7596 | -- sequences. Presumably if one of the restrictive encoding mechanisms | |
7597 | -- is in use such as Shift-JIS, then characters that cannot be | |
7598 | -- represented using this encoding will not appear in any case. | |
70482933 | 7599 | |
d8f43ee6 | 7600 | when Attribute_Wide_Value => |
70482933 RK |
7601 | Rewrite (N, |
7602 | Make_Attribute_Reference (Loc, | |
7603 | Prefix => Pref, | |
7604 | Attribute_Name => Name_Value, | |
7605 | ||
7606 | Expressions => New_List ( | |
7607 | Make_Function_Call (Loc, | |
7608 | Name => | |
e4494292 | 7609 | New_Occurrence_Of (RTE (RE_Wide_String_To_String), Loc), |
70482933 RK |
7610 | |
7611 | Parameter_Associations => New_List ( | |
7612 | Relocate_Node (First (Exprs)), | |
7613 | Make_Integer_Literal (Loc, | |
7614 | Intval => Int (Wide_Character_Encoding_Method))))))); | |
7615 | ||
7616 | Analyze_And_Resolve (N, Typ); | |
70482933 | 7617 | |
82c80734 RD |
7618 | --------------------- |
7619 | -- Wide_Wide_Value -- | |
7620 | --------------------- | |
7621 | ||
7622 | -- We expand typ'Wide_Value_Value (X) into | |
7623 | ||
7624 | -- typ'Value | |
7625 | -- (Wide_Wide_String_To_String (X, Wide_Character_Encoding_Method)) | |
7626 | ||
336438b6 BD |
7627 | -- See Wide_Value for more information. This is not quite right where |
7628 | -- typ = Wide_Wide_Character, because the encoding method may not cover | |
7629 | -- the whole character type. | |
82c80734 | 7630 | |
d8f43ee6 | 7631 | when Attribute_Wide_Wide_Value => |
82c80734 RD |
7632 | Rewrite (N, |
7633 | Make_Attribute_Reference (Loc, | |
7634 | Prefix => Pref, | |
7635 | Attribute_Name => Name_Value, | |
7636 | ||
7637 | Expressions => New_List ( | |
7638 | Make_Function_Call (Loc, | |
d8f43ee6 | 7639 | Name => |
e4494292 RD |
7640 | New_Occurrence_Of |
7641 | (RTE (RE_Wide_Wide_String_To_String), Loc), | |
82c80734 RD |
7642 | |
7643 | Parameter_Associations => New_List ( | |
7644 | Relocate_Node (First (Exprs)), | |
7645 | Make_Integer_Literal (Loc, | |
7646 | Intval => Int (Wide_Character_Encoding_Method))))))); | |
7647 | ||
7648 | Analyze_And_Resolve (N, Typ); | |
82c80734 RD |
7649 | |
7650 | --------------------- | |
7651 | -- Wide_Wide_Width -- | |
7652 | --------------------- | |
7653 | ||
82c80734 RD |
7654 | when Attribute_Wide_Wide_Width => |
7655 | Exp_Imgv.Expand_Width_Attribute (N, Wide_Wide); | |
7656 | ||
70482933 RK |
7657 | ---------------- |
7658 | -- Wide_Width -- | |
7659 | ---------------- | |
7660 | ||
70482933 | 7661 | when Attribute_Wide_Width => |
82c80734 | 7662 | Exp_Imgv.Expand_Width_Attribute (N, Wide); |
70482933 RK |
7663 | |
7664 | ----------- | |
7665 | -- Width -- | |
7666 | ----------- | |
7667 | ||
70482933 | 7668 | when Attribute_Width => |
82c80734 | 7669 | Exp_Imgv.Expand_Width_Attribute (N, Normal); |
70482933 RK |
7670 | |
7671 | ----------- | |
7672 | -- Write -- | |
7673 | ----------- | |
7674 | ||
7675 | when Attribute_Write => Write : declare | |
7676 | P_Type : constant Entity_Id := Entity (Pref); | |
7677 | U_Type : constant Entity_Id := Underlying_Type (P_Type); | |
7678 | Pname : Entity_Id; | |
7679 | Decl : Node_Id; | |
7680 | Prag : Node_Id; | |
7681 | Arg3 : Node_Id; | |
7682 | Wfunc : Node_Id; | |
7683 | ||
7684 | begin | |
7685 | -- If no underlying type, we have an error that will be diagnosed | |
7686 | -- elsewhere, so here we just completely ignore the expansion. | |
7687 | ||
7688 | if No (U_Type) then | |
7689 | return; | |
7690 | end if; | |
7691 | ||
baa571ab AC |
7692 | -- Stream operations can appear in user code even if the restriction |
7693 | -- No_Streams is active (for example, when instantiating a predefined | |
7694 | -- container). In that case rewrite the attribute as a Raise to | |
7695 | -- prevent any run-time use. | |
7696 | ||
7697 | if Restriction_Active (No_Streams) then | |
7698 | Rewrite (N, | |
7699 | Make_Raise_Program_Error (Sloc (N), | |
b8b2d982 | 7700 | Reason => PE_Stream_Operation_Not_Allowed)); |
baa571ab AC |
7701 | Set_Etype (N, U_Type); |
7702 | return; | |
7703 | end if; | |
7704 | ||
70482933 RK |
7705 | -- The simple case, if there is a TSS for Write, just call it |
7706 | ||
fbf5a39b | 7707 | Pname := Find_Stream_Subprogram (P_Type, TSS_Stream_Write); |
70482933 RK |
7708 | |
7709 | if Present (Pname) then | |
7710 | null; | |
7711 | ||
7712 | else | |
7713 | -- If there is a Stream_Convert pragma, use it, we rewrite | |
7714 | ||
7715 | -- sourcetyp'Output (stream, Item) | |
7716 | ||
7717 | -- as | |
7718 | ||
7719 | -- strmtyp'Output (Stream, strmwrite (acttyp (Item))); | |
7720 | ||
758c442c GD |
7721 | -- where strmwrite is the given Write function that converts an |
7722 | -- argument of type sourcetyp or a type acctyp, from which it is | |
7723 | -- derived to type strmtyp. The conversion to acttyp is required | |
7724 | -- for the derived case. | |
70482933 | 7725 | |
1d571f3b | 7726 | Prag := Get_Stream_Convert_Pragma (P_Type); |
70482933 RK |
7727 | |
7728 | if Present (Prag) then | |
7729 | Arg3 := | |
7730 | Next (Next (First (Pragma_Argument_Associations (Prag)))); | |
7731 | Wfunc := Entity (Expression (Arg3)); | |
7732 | ||
7733 | Rewrite (N, | |
7734 | Make_Attribute_Reference (Loc, | |
7735 | Prefix => New_Occurrence_Of (Etype (Wfunc), Loc), | |
7736 | Attribute_Name => Name_Output, | |
7737 | Expressions => New_List ( | |
7738 | Relocate_Node (First (Exprs)), | |
7739 | Make_Function_Call (Loc, | |
7740 | Name => New_Occurrence_Of (Wfunc, Loc), | |
7741 | Parameter_Associations => New_List ( | |
31104818 | 7742 | OK_Convert_To (Etype (First_Formal (Wfunc)), |
70482933 RK |
7743 | Relocate_Node (Next (First (Exprs))))))))); |
7744 | ||
7745 | Analyze (N); | |
7746 | return; | |
7747 | ||
29f2d76c SB |
7748 | -- Limited types |
7749 | ||
7750 | elsif Default_Streaming_Unavailable (U_Type) then | |
7751 | -- Do the same thing here as is done above in the | |
7752 | -- case where a No_Streams restriction is active. | |
7753 | ||
7754 | Rewrite (N, | |
7755 | Make_Raise_Program_Error (Sloc (N), | |
7756 | Reason => PE_Stream_Operation_Not_Allowed)); | |
7757 | Set_Etype (N, U_Type); | |
7758 | return; | |
7759 | ||
70482933 RK |
7760 | -- For elementary types, we call the W_xxx routine directly |
7761 | ||
7762 | elsif Is_Elementary_Type (U_Type) then | |
7763 | Rewrite (N, Build_Elementary_Write_Call (N)); | |
7764 | Analyze (N); | |
7765 | return; | |
7766 | ||
7767 | -- Array type case | |
7768 | ||
7769 | elsif Is_Array_Type (U_Type) then | |
7770 | Build_Array_Write_Procedure (N, U_Type, Decl, Pname); | |
fb632ef5 | 7771 | Compile_Stream_Body_In_Scope (N, Decl, U_Type); |
70482933 RK |
7772 | |
7773 | -- Tagged type case, use the primitive Write function. Note that | |
7774 | -- this will dispatch in the class-wide case which is what we want | |
7775 | ||
7776 | elsif Is_Tagged_Type (U_Type) then | |
fbf5a39b | 7777 | Pname := Find_Prim_Op (U_Type, TSS_Stream_Write); |
70482933 RK |
7778 | |
7779 | -- All other record type cases, including protected records. | |
7780 | -- The latter only arise for expander generated code for | |
7781 | -- handling shared passive partition access. | |
7782 | ||
7783 | else | |
7784 | pragma Assert | |
7785 | (Is_Record_Type (U_Type) or else Is_Protected_Type (U_Type)); | |
7786 | ||
5d09245e AC |
7787 | -- Ada 2005 (AI-216): Program_Error is raised when executing |
7788 | -- the default implementation of the Write attribute of an | |
0669bebe GB |
7789 | -- Unchecked_Union type. However, if the 'Write reference is |
7790 | -- within the generated Output stream procedure, Write outputs | |
7791 | -- the components, and the default values of the discriminant | |
1f70c47f AC |
7792 | -- are streamed by the Output procedure itself. If there are |
7793 | -- no default values this is also erroneous. | |
5d09245e | 7794 | |
1f70c47f AC |
7795 | if Is_Unchecked_Union (Base_Type (U_Type)) then |
7796 | if (not Is_TSS (Current_Scope, TSS_Stream_Output) | |
7797 | and not Is_TSS (Current_Scope, TSS_Stream_Write)) | |
7798 | or else No (Discriminant_Default_Value | |
7799 | (First_Discriminant (U_Type))) | |
7800 | then | |
7801 | Rewrite (N, | |
7802 | Make_Raise_Program_Error (Loc, | |
7803 | Reason => PE_Unchecked_Union_Restriction)); | |
7804 | Set_Etype (N, U_Type); | |
7805 | return; | |
7806 | end if; | |
5d09245e AC |
7807 | end if; |
7808 | ||
8adc8d9b | 7809 | if Has_Defaulted_Discriminants (U_Type) then |
70482933 | 7810 | Build_Mutable_Record_Write_Procedure |
96d2756f | 7811 | (Loc, Full_Base (U_Type), Decl, Pname); |
70482933 RK |
7812 | else |
7813 | Build_Record_Write_Procedure | |
96d2756f | 7814 | (Loc, Full_Base (U_Type), Decl, Pname); |
70482933 RK |
7815 | end if; |
7816 | ||
7817 | Insert_Action (N, Decl); | |
7818 | end if; | |
7819 | end if; | |
7820 | ||
7821 | -- If we fall through, Pname is the procedure to be called | |
7822 | ||
110d0820 | 7823 | Rewrite_Attribute_Proc_Call (Pname); |
70482933 RK |
7824 | end Write; |
7825 | ||
80d4224f RD |
7826 | -- The following attributes are handled by the back end (except that |
7827 | -- static cases have already been evaluated during semantic processing, | |
7828 | -- but in any case the back end should not count on this). | |
70482933 | 7829 | |
3874e79d | 7830 | when Attribute_Code_Address |
d8f43ee6 HK |
7831 | | Attribute_Deref |
7832 | | Attribute_Null_Parameter | |
7833 | | Attribute_Passed_By_Reference | |
7834 | | Attribute_Pool_Address | |
d8f43ee6 | 7835 | => |
70482933 RK |
7836 | null; |
7837 | ||
70482933 RK |
7838 | -- The following attributes should not appear at this stage, since they |
7839 | -- have already been handled by the analyzer (and properly rewritten | |
90cb252f | 7840 | -- with corresponding values or entities to represent the right values). |
70482933 | 7841 | |
d8f43ee6 HK |
7842 | when Attribute_Abort_Signal |
7843 | | Attribute_Address_Size | |
3874e79d | 7844 | | Attribute_Aft |
d8f43ee6 HK |
7845 | | Attribute_Atomic_Always_Lock_Free |
7846 | | Attribute_Base | |
3874e79d | 7847 | | Attribute_Bit_Order |
d8f43ee6 HK |
7848 | | Attribute_Class |
7849 | | Attribute_Compiler_Version | |
7850 | | Attribute_Default_Bit_Order | |
7851 | | Attribute_Default_Scalar_Storage_Order | |
3874e79d | 7852 | | Attribute_Definite |
d8f43ee6 HK |
7853 | | Attribute_Delta |
7854 | | Attribute_Denorm | |
7855 | | Attribute_Digits | |
7856 | | Attribute_Emax | |
7857 | | Attribute_Enabled | |
7858 | | Attribute_Epsilon | |
7859 | | Attribute_Fast_Math | |
7860 | | Attribute_First_Valid | |
7861 | | Attribute_Has_Access_Values | |
7862 | | Attribute_Has_Discriminants | |
7863 | | Attribute_Has_Tagged_Values | |
7864 | | Attribute_Large | |
7865 | | Attribute_Last_Valid | |
7866 | | Attribute_Library_Level | |
7867 | | Attribute_Lock_Free | |
7868 | | Attribute_Machine_Emax | |
7869 | | Attribute_Machine_Emin | |
7870 | | Attribute_Machine_Mantissa | |
7871 | | Attribute_Machine_Overflows | |
7872 | | Attribute_Machine_Radix | |
7873 | | Attribute_Machine_Rounds | |
3874e79d | 7874 | | Attribute_Max_Alignment_For_Allocation |
c7c7dd3a | 7875 | | Attribute_Max_Integer_Size |
d8f43ee6 HK |
7876 | | Attribute_Maximum_Alignment |
7877 | | Attribute_Model_Emin | |
7878 | | Attribute_Model_Epsilon | |
7879 | | Attribute_Model_Mantissa | |
7880 | | Attribute_Model_Small | |
7881 | | Attribute_Modulus | |
7882 | | Attribute_Partition_ID | |
7883 | | Attribute_Range | |
7884 | | Attribute_Restriction_Set | |
7885 | | Attribute_Safe_Emax | |
7886 | | Attribute_Safe_First | |
7887 | | Attribute_Safe_Large | |
7888 | | Attribute_Safe_Last | |
7889 | | Attribute_Safe_Small | |
3874e79d | 7890 | | Attribute_Scalar_Storage_Order |
d8f43ee6 HK |
7891 | | Attribute_Scale |
7892 | | Attribute_Signed_Zeros | |
7893 | | Attribute_Small | |
2bf891fa EB |
7894 | | Attribute_Small_Denominator |
7895 | | Attribute_Small_Numerator | |
d8f43ee6 HK |
7896 | | Attribute_Storage_Unit |
7897 | | Attribute_Stub_Type | |
7898 | | Attribute_System_Allocator_Alignment | |
7899 | | Attribute_Target_Name | |
7900 | | Attribute_Type_Class | |
7901 | | Attribute_Type_Key | |
7902 | | Attribute_Unconstrained_Array | |
7903 | | Attribute_Universal_Literal_String | |
7904 | | Attribute_Wchar_T_Size | |
7905 | | Attribute_Word_Size | |
7906 | => | |
70482933 | 7907 | raise Program_Error; |
70482933 RK |
7908 | end case; |
7909 | ||
2eef7403 AC |
7910 | -- Note: as mentioned earlier, individual sections of the above case |
7911 | -- statement assume there is no code after the case statement, and are | |
7912 | -- legitimately allowed to execute return statements if they have nothing | |
7913 | -- more to do, so DO NOT add code at this point. | |
7914 | ||
fbf5a39b AC |
7915 | exception |
7916 | when RE_Not_Available => | |
7917 | return; | |
70482933 RK |
7918 | end Expand_N_Attribute_Reference; |
7919 | ||
aa9b151a AC |
7920 | -------------------------------- |
7921 | -- Expand_Pred_Succ_Attribute -- | |
7922 | -------------------------------- | |
70482933 RK |
7923 | |
7924 | -- For typ'Pred (exp), we generate the check | |
7925 | ||
7926 | -- [constraint_error when exp = typ'Base'First] | |
7927 | ||
7928 | -- Similarly, for typ'Succ (exp), we generate the check | |
7929 | ||
7930 | -- [constraint_error when exp = typ'Base'Last] | |
7931 | ||
7932 | -- These checks are not generated for modular types, since the proper | |
7933 | -- semantics for Succ and Pred on modular types is to wrap, not raise CE. | |
c7532b2d AC |
7934 | -- We also suppress these checks if we are the right side of an assignment |
7935 | -- statement or the expression of an object declaration, where the flag | |
7936 | -- Suppress_Assignment_Checks is set for the assignment/declaration. | |
70482933 | 7937 | |
aa9b151a | 7938 | procedure Expand_Pred_Succ_Attribute (N : Node_Id) is |
70482933 | 7939 | Loc : constant Source_Ptr := Sloc (N); |
c7532b2d | 7940 | P : constant Node_Id := Parent (N); |
70482933 RK |
7941 | Cnam : Name_Id; |
7942 | ||
7943 | begin | |
7944 | if Attribute_Name (N) = Name_Pred then | |
7945 | Cnam := Name_First; | |
7946 | else | |
7947 | Cnam := Name_Last; | |
7948 | end if; | |
7949 | ||
4a08c95c | 7950 | if Nkind (P) not in N_Assignment_Statement | N_Object_Declaration |
c7532b2d AC |
7951 | or else not Suppress_Assignment_Checks (P) |
7952 | then | |
7953 | Insert_Action (N, | |
7954 | Make_Raise_Constraint_Error (Loc, | |
7955 | Condition => | |
7956 | Make_Op_Eq (Loc, | |
7957 | Left_Opnd => | |
7958 | Duplicate_Subexpr_Move_Checks (First (Expressions (N))), | |
7959 | Right_Opnd => | |
7960 | Make_Attribute_Reference (Loc, | |
7961 | Prefix => | |
e4494292 | 7962 | New_Occurrence_Of (Base_Type (Etype (Prefix (N))), Loc), |
c7532b2d AC |
7963 | Attribute_Name => Cnam)), |
7964 | Reason => CE_Overflow_Check_Failed)); | |
7965 | end if; | |
aa9b151a | 7966 | end Expand_Pred_Succ_Attribute; |
70482933 | 7967 | |
d39f6b24 YM |
7968 | --------------------------- |
7969 | -- Expand_Size_Attribute -- | |
7970 | --------------------------- | |
7971 | ||
7972 | procedure Expand_Size_Attribute (N : Node_Id) is | |
14a16e30 PT |
7973 | Loc : constant Source_Ptr := Sloc (N); |
7974 | Typ : constant Entity_Id := Etype (N); | |
7975 | Pref : constant Node_Id := Prefix (N); | |
7976 | Ptyp : constant Entity_Id := Etype (Pref); | |
7977 | Id : constant Attribute_Id := Get_Attribute_Id (Attribute_Name (N)); | |
7978 | Siz : Uint; | |
d39f6b24 YM |
7979 | |
7980 | begin | |
7981 | -- Case of known RM_Size of a type | |
7982 | ||
14a16e30 | 7983 | if Id in Attribute_Size | Attribute_Value_Size |
d39f6b24 YM |
7984 | and then Is_Entity_Name (Pref) |
7985 | and then Is_Type (Entity (Pref)) | |
7986 | and then Known_Static_RM_Size (Entity (Pref)) | |
7987 | then | |
7988 | Siz := RM_Size (Entity (Pref)); | |
7989 | ||
7990 | -- Case of known Esize of a type | |
7991 | ||
7992 | elsif Id = Attribute_Object_Size | |
7993 | and then Is_Entity_Name (Pref) | |
7994 | and then Is_Type (Entity (Pref)) | |
7995 | and then Known_Static_Esize (Entity (Pref)) | |
7996 | then | |
7997 | Siz := Esize (Entity (Pref)); | |
7998 | ||
7999 | -- Case of known size of object | |
8000 | ||
8001 | elsif Id = Attribute_Size | |
8002 | and then Is_Entity_Name (Pref) | |
8003 | and then Is_Object (Entity (Pref)) | |
d39f6b24 YM |
8004 | and then Known_Static_Esize (Entity (Pref)) |
8005 | then | |
8006 | Siz := Esize (Entity (Pref)); | |
8007 | ||
8008 | -- For an array component, we can do Size in the front end if the | |
8009 | -- component_size of the array is set. | |
8010 | ||
8011 | elsif Nkind (Pref) = N_Indexed_Component then | |
8012 | Siz := Component_Size (Etype (Prefix (Pref))); | |
8013 | ||
8014 | -- For a record component, we can do Size in the front end if there is a | |
8015 | -- component clause, or if the record is packed and the component's size | |
8016 | -- is known at compile time. | |
8017 | ||
8018 | elsif Nkind (Pref) = N_Selected_Component then | |
8019 | declare | |
8020 | Rec : constant Entity_Id := Etype (Prefix (Pref)); | |
8021 | Comp : constant Entity_Id := Entity (Selector_Name (Pref)); | |
8022 | ||
8023 | begin | |
8024 | if Present (Component_Clause (Comp)) then | |
8025 | Siz := Esize (Comp); | |
8026 | ||
8027 | elsif Is_Packed (Rec) then | |
8028 | Siz := RM_Size (Ptyp); | |
8029 | ||
8030 | else | |
8031 | Apply_Universal_Integer_Attribute_Checks (N); | |
8032 | return; | |
8033 | end if; | |
8034 | end; | |
8035 | ||
8036 | -- All other cases are handled by the back end | |
8037 | ||
8038 | else | |
d39f6b24 YM |
8039 | -- If Size is applied to a formal parameter that is of a packed |
8040 | -- array subtype, then apply Size to the actual subtype. | |
8041 | ||
8042 | if Is_Entity_Name (Pref) | |
8043 | and then Is_Formal (Entity (Pref)) | |
bfe5f951 | 8044 | and then Is_Packed_Array (Ptyp) |
d39f6b24 YM |
8045 | then |
8046 | Rewrite (N, | |
8047 | Make_Attribute_Reference (Loc, | |
8048 | Prefix => | |
8049 | New_Occurrence_Of (Get_Actual_Subtype (Pref), Loc), | |
8050 | Attribute_Name => Name_Size)); | |
8051 | Analyze_And_Resolve (N, Typ); | |
d39f6b24 | 8052 | |
37915d02 | 8053 | -- If Size is applied to a dereference of an access to unconstrained |
d39f6b24 YM |
8054 | -- packed array, the back end needs to see its unconstrained nominal |
8055 | -- type, but also a hint to the actual constrained type. | |
8056 | ||
37915d02 | 8057 | elsif Nkind (Pref) = N_Explicit_Dereference |
bfe5f951 | 8058 | and then Is_Packed_Array (Ptyp) |
d39f6b24 | 8059 | and then not Is_Constrained (Ptyp) |
d39f6b24 YM |
8060 | then |
8061 | Set_Actual_Designated_Subtype (Pref, Get_Actual_Subtype (Pref)); | |
37915d02 EB |
8062 | |
8063 | -- If Size was applied to a slice of a bit-packed array, we rewrite | |
8064 | -- it into the product of Length and Component_Size. We need to do so | |
8065 | -- because bit-packed arrays are represented internally as arrays of | |
8066 | -- System.Unsigned_Types.Packed_Byte for code generation purposes so | |
8067 | -- the size is always rounded up in the back end. | |
8068 | ||
955379e4 | 8069 | elsif Nkind (Pref) = N_Slice and then Is_Bit_Packed_Array (Ptyp) then |
37915d02 EB |
8070 | Rewrite (N, |
8071 | Make_Op_Multiply (Loc, | |
8072 | Make_Attribute_Reference (Loc, | |
8073 | Prefix => Duplicate_Subexpr (Pref, True), | |
8074 | Attribute_Name => Name_Length), | |
8075 | Make_Attribute_Reference (Loc, | |
8076 | Prefix => Duplicate_Subexpr (Pref, True), | |
8077 | Attribute_Name => Name_Component_Size))); | |
8078 | Analyze_And_Resolve (N, Typ); | |
d39f6b24 YM |
8079 | end if; |
8080 | ||
955379e4 EB |
8081 | -- Apply the required checks last, after rewriting has taken place |
8082 | ||
8083 | Apply_Universal_Integer_Attribute_Checks (N); | |
d39f6b24 YM |
8084 | return; |
8085 | end if; | |
8086 | ||
8087 | -- Common processing for record and array component case | |
8088 | ||
2175b50b | 8089 | if Present (Siz) and then Siz /= 0 then |
d39f6b24 YM |
8090 | declare |
8091 | CS : constant Boolean := Comes_From_Source (N); | |
8092 | ||
8093 | begin | |
8094 | Rewrite (N, Make_Integer_Literal (Loc, Siz)); | |
8095 | ||
8096 | -- This integer literal is not a static expression. We do not | |
8097 | -- call Analyze_And_Resolve here, because this would activate | |
8098 | -- the circuit for deciding that a static value was out of range, | |
8099 | -- and we don't want that. | |
8100 | ||
8101 | -- So just manually set the type, mark the expression as | |
8102 | -- nonstatic, and then ensure that the result is checked | |
8103 | -- properly if the attribute comes from source (if it was | |
8104 | -- internally generated, we never need a constraint check). | |
8105 | ||
8106 | Set_Etype (N, Typ); | |
8107 | Set_Is_Static_Expression (N, False); | |
8108 | ||
8109 | if CS then | |
8110 | Apply_Constraint_Check (N, Typ); | |
8111 | end if; | |
8112 | end; | |
8113 | end if; | |
8114 | end Expand_Size_Attribute; | |
8115 | ||
18a2ad5d AC |
8116 | ----------------------------- |
8117 | -- Expand_Update_Attribute -- | |
8118 | ----------------------------- | |
8119 | ||
8120 | procedure Expand_Update_Attribute (N : Node_Id) is | |
8121 | procedure Process_Component_Or_Element_Update | |
8122 | (Temp : Entity_Id; | |
8123 | Comp : Node_Id; | |
8124 | Expr : Node_Id; | |
8125 | Typ : Entity_Id); | |
8126 | -- Generate the statements necessary to update a single component or an | |
8127 | -- element of the prefix. The code is inserted before the attribute N. | |
8128 | -- Temp denotes the entity of the anonymous object created to reflect | |
8129 | -- the changes in values. Comp is the component/index expression to be | |
8130 | -- updated. Expr is an expression yielding the new value of Comp. Typ | |
8131 | -- is the type of the prefix of attribute Update. | |
8132 | ||
8133 | procedure Process_Range_Update | |
8134 | (Temp : Entity_Id; | |
8135 | Comp : Node_Id; | |
d12b19fa AC |
8136 | Expr : Node_Id; |
8137 | Typ : Entity_Id); | |
18a2ad5d AC |
8138 | -- Generate the statements necessary to update a slice of the prefix. |
8139 | -- The code is inserted before the attribute N. Temp denotes the entity | |
8140 | -- of the anonymous object created to reflect the changes in values. | |
8141 | -- Comp is range of the slice to be updated. Expr is an expression | |
d12b19fa AC |
8142 | -- yielding the new value of Comp. Typ is the type of the prefix of |
8143 | -- attribute Update. | |
18a2ad5d AC |
8144 | |
8145 | ----------------------------------------- | |
8146 | -- Process_Component_Or_Element_Update -- | |
8147 | ----------------------------------------- | |
8148 | ||
8149 | procedure Process_Component_Or_Element_Update | |
8150 | (Temp : Entity_Id; | |
8151 | Comp : Node_Id; | |
8152 | Expr : Node_Id; | |
8153 | Typ : Entity_Id) | |
8154 | is | |
8155 | Loc : constant Source_Ptr := Sloc (Comp); | |
8156 | Exprs : List_Id; | |
8157 | LHS : Node_Id; | |
8158 | ||
8159 | begin | |
8160 | -- An array element may be modified by the following relations | |
8161 | -- depending on the number of dimensions: | |
8162 | ||
8163 | -- 1 => Expr -- one dimensional update | |
8164 | -- (1, ..., N) => Expr -- multi dimensional update | |
8165 | ||
8166 | -- The above forms are converted in assignment statements where the | |
8167 | -- left hand side is an indexed component: | |
8168 | ||
8169 | -- Temp (1) := Expr; -- one dimensional update | |
8170 | -- Temp (1, ..., N) := Expr; -- multi dimensional update | |
8171 | ||
8172 | if Is_Array_Type (Typ) then | |
8173 | ||
8174 | -- The index expressions of a multi dimensional array update | |
8175 | -- appear as an aggregate. | |
8176 | ||
8177 | if Nkind (Comp) = N_Aggregate then | |
8178 | Exprs := New_Copy_List_Tree (Expressions (Comp)); | |
8179 | else | |
8180 | Exprs := New_List (Relocate_Node (Comp)); | |
8181 | end if; | |
8182 | ||
8183 | LHS := | |
8184 | Make_Indexed_Component (Loc, | |
e4494292 | 8185 | Prefix => New_Occurrence_Of (Temp, Loc), |
18a2ad5d AC |
8186 | Expressions => Exprs); |
8187 | ||
8188 | -- A record component update appears in the following form: | |
8189 | ||
8190 | -- Comp => Expr | |
8191 | ||
8192 | -- The above relation is transformed into an assignment statement | |
8193 | -- where the left hand side is a selected component: | |
8194 | ||
8195 | -- Temp.Comp := Expr; | |
8196 | ||
8197 | else pragma Assert (Is_Record_Type (Typ)); | |
8198 | LHS := | |
8199 | Make_Selected_Component (Loc, | |
e4494292 | 8200 | Prefix => New_Occurrence_Of (Temp, Loc), |
18a2ad5d AC |
8201 | Selector_Name => Relocate_Node (Comp)); |
8202 | end if; | |
8203 | ||
8204 | Insert_Action (N, | |
8205 | Make_Assignment_Statement (Loc, | |
8206 | Name => LHS, | |
8207 | Expression => Relocate_Node (Expr))); | |
8208 | end Process_Component_Or_Element_Update; | |
8209 | ||
8210 | -------------------------- | |
8211 | -- Process_Range_Update -- | |
8212 | -------------------------- | |
8213 | ||
8214 | procedure Process_Range_Update | |
8215 | (Temp : Entity_Id; | |
8216 | Comp : Node_Id; | |
d12b19fa AC |
8217 | Expr : Node_Id; |
8218 | Typ : Entity_Id) | |
18a2ad5d | 8219 | is |
d12b19fa AC |
8220 | Index_Typ : constant Entity_Id := Etype (First_Index (Typ)); |
8221 | Loc : constant Source_Ptr := Sloc (Comp); | |
8222 | Index : Entity_Id; | |
18a2ad5d AC |
8223 | |
8224 | begin | |
8225 | -- A range update appears as | |
8226 | ||
8227 | -- (Low .. High => Expr) | |
8228 | ||
8229 | -- The above construct is transformed into a loop that iterates over | |
8230 | -- the given range and modifies the corresponding array values to the | |
8231 | -- value of Expr: | |
8232 | ||
8233 | -- for Index in Low .. High loop | |
d12b19fa | 8234 | -- Temp (<Index_Typ> (Index)) := Expr; |
18a2ad5d AC |
8235 | -- end loop; |
8236 | ||
8237 | Index := Make_Temporary (Loc, 'I'); | |
8238 | ||
8239 | Insert_Action (N, | |
8240 | Make_Loop_Statement (Loc, | |
8241 | Iteration_Scheme => | |
8242 | Make_Iteration_Scheme (Loc, | |
8243 | Loop_Parameter_Specification => | |
8244 | Make_Loop_Parameter_Specification (Loc, | |
8245 | Defining_Identifier => Index, | |
8246 | Discrete_Subtype_Definition => Relocate_Node (Comp))), | |
8247 | ||
8248 | Statements => New_List ( | |
8249 | Make_Assignment_Statement (Loc, | |
8250 | Name => | |
8251 | Make_Indexed_Component (Loc, | |
e4494292 | 8252 | Prefix => New_Occurrence_Of (Temp, Loc), |
d12b19fa | 8253 | Expressions => New_List ( |
e4494292 RD |
8254 | Convert_To (Index_Typ, |
8255 | New_Occurrence_Of (Index, Loc)))), | |
18a2ad5d AC |
8256 | Expression => Relocate_Node (Expr))), |
8257 | ||
8258 | End_Label => Empty)); | |
8259 | end Process_Range_Update; | |
8260 | ||
8261 | -- Local variables | |
8262 | ||
6c802906 AC |
8263 | Aggr : constant Node_Id := First (Expressions (N)); |
8264 | Loc : constant Source_Ptr := Sloc (N); | |
8265 | Pref : constant Node_Id := Prefix (N); | |
8266 | Typ : constant Entity_Id := Etype (Pref); | |
8267 | Assoc : Node_Id; | |
8268 | Comp : Node_Id; | |
8269 | CW_Temp : Entity_Id; | |
8270 | CW_Typ : Entity_Id; | |
8271 | Expr : Node_Id; | |
8272 | Temp : Entity_Id; | |
18a2ad5d AC |
8273 | |
8274 | -- Start of processing for Expand_Update_Attribute | |
8275 | ||
8276 | begin | |
6c802906 AC |
8277 | -- Create the anonymous object to store the value of the prefix and |
8278 | -- capture subsequent changes in value. | |
8279 | ||
8280 | Temp := Make_Temporary (Loc, 'T', Pref); | |
18a2ad5d | 8281 | |
6c802906 AC |
8282 | -- Preserve the tag of the prefix by offering a specific view of the |
8283 | -- class-wide version of the prefix. | |
18a2ad5d | 8284 | |
6c802906 | 8285 | if Is_Tagged_Type (Typ) then |
18a2ad5d | 8286 | |
6c802906 AC |
8287 | -- Generate: |
8288 | -- CW_Temp : Typ'Class := Typ'Class (Pref); | |
8289 | ||
8290 | CW_Temp := Make_Temporary (Loc, 'T'); | |
8291 | CW_Typ := Class_Wide_Type (Typ); | |
8292 | ||
8293 | Insert_Action (N, | |
8294 | Make_Object_Declaration (Loc, | |
8295 | Defining_Identifier => CW_Temp, | |
8296 | Object_Definition => New_Occurrence_Of (CW_Typ, Loc), | |
8297 | Expression => | |
8298 | Convert_To (CW_Typ, Relocate_Node (Pref)))); | |
8299 | ||
8300 | -- Generate: | |
8301 | -- Temp : Typ renames Typ (CW_Temp); | |
8302 | ||
8303 | Insert_Action (N, | |
8304 | Make_Object_Renaming_Declaration (Loc, | |
8305 | Defining_Identifier => Temp, | |
8306 | Subtype_Mark => New_Occurrence_Of (Typ, Loc), | |
8307 | Name => | |
8308 | Convert_To (Typ, New_Occurrence_Of (CW_Temp, Loc)))); | |
8309 | ||
8310 | -- Non-tagged case | |
8311 | ||
8312 | else | |
8313 | -- Generate: | |
8314 | -- Temp : Typ := Pref; | |
8315 | ||
8316 | Insert_Action (N, | |
8317 | Make_Object_Declaration (Loc, | |
8318 | Defining_Identifier => Temp, | |
8319 | Object_Definition => New_Occurrence_Of (Typ, Loc), | |
8320 | Expression => Relocate_Node (Pref))); | |
8321 | end if; | |
18a2ad5d AC |
8322 | |
8323 | -- Process the update aggregate | |
8324 | ||
8325 | Assoc := First (Component_Associations (Aggr)); | |
8326 | while Present (Assoc) loop | |
8327 | Comp := First (Choices (Assoc)); | |
8328 | Expr := Expression (Assoc); | |
8329 | while Present (Comp) loop | |
8330 | if Nkind (Comp) = N_Range then | |
d12b19fa | 8331 | Process_Range_Update (Temp, Comp, Expr, Typ); |
3b01ce30 PT |
8332 | elsif Nkind (Comp) = N_Subtype_Indication then |
8333 | Process_Range_Update | |
8334 | (Temp, Range_Expression (Constraint (Comp)), Expr, Typ); | |
18a2ad5d AC |
8335 | else |
8336 | Process_Component_Or_Element_Update (Temp, Comp, Expr, Typ); | |
8337 | end if; | |
8338 | ||
8339 | Next (Comp); | |
8340 | end loop; | |
8341 | ||
8342 | Next (Assoc); | |
8343 | end loop; | |
8344 | ||
8345 | -- The attribute is replaced by a reference to the anonymous object | |
8346 | ||
e4494292 | 8347 | Rewrite (N, New_Occurrence_Of (Temp, Loc)); |
18a2ad5d AC |
8348 | Analyze (N); |
8349 | end Expand_Update_Attribute; | |
8350 | ||
65f01153 RD |
8351 | ------------------- |
8352 | -- Find_Fat_Info -- | |
8353 | ------------------- | |
8354 | ||
8355 | procedure Find_Fat_Info | |
8356 | (T : Entity_Id; | |
8357 | Fat_Type : out Entity_Id; | |
8358 | Fat_Pkg : out RE_Id) | |
8359 | is | |
65f01153 | 8360 | Rtyp : constant Entity_Id := Root_Type (T); |
65f01153 RD |
8361 | |
8362 | begin | |
80211802 AC |
8363 | -- All we do is use the root type (historically this dealt with |
8364 | -- VAX-float .. to be cleaned up further later ???) | |
65f01153 | 8365 | |
338e5133 EB |
8366 | if Rtyp = Standard_Short_Float or else Rtyp = Standard_Float then |
8367 | Fat_Type := Standard_Float; | |
8368 | Fat_Pkg := RE_Attr_Float; | |
65f01153 | 8369 | |
338e5133 EB |
8370 | elsif Rtyp = Standard_Long_Float then |
8371 | Fat_Type := Standard_Long_Float; | |
8372 | Fat_Pkg := RE_Attr_Long_Float; | |
65f01153 | 8373 | |
338e5133 EB |
8374 | elsif Rtyp = Standard_Long_Long_Float then |
8375 | Fat_Type := Standard_Long_Long_Float; | |
8376 | Fat_Pkg := RE_Attr_Long_Long_Float; | |
7ce611e2 ES |
8377 | |
8378 | -- Universal real (which is its own root type) is treated as being | |
8379 | -- equivalent to Standard.Long_Long_Float, since it is defined to | |
8380 | -- have the same precision as the longest Float type. | |
8381 | ||
338e5133 | 8382 | elsif Rtyp = Universal_Real then |
80211802 | 8383 | Fat_Type := Standard_Long_Long_Float; |
338e5133 | 8384 | Fat_Pkg := RE_Attr_Long_Long_Float; |
7ce611e2 | 8385 | |
80211802 AC |
8386 | else |
8387 | raise Program_Error; | |
65f01153 RD |
8388 | end if; |
8389 | end Find_Fat_Info; | |
8390 | ||
fbf5a39b AC |
8391 | ---------------------------- |
8392 | -- Find_Stream_Subprogram -- | |
8393 | ---------------------------- | |
8394 | ||
8395 | function Find_Stream_Subprogram | |
8396 | (Typ : Entity_Id; | |
758c442c GD |
8397 | Nam : TSS_Name_Type) return Entity_Id |
8398 | is | |
b2c6b35f HK |
8399 | Base_Typ : constant Entity_Id := Base_Type (Typ); |
8400 | Ent : constant Entity_Id := TSS (Typ, Nam); | |
fbf5a39b | 8401 | begin |
758c442c GD |
8402 | if Present (Ent) then |
8403 | return Ent; | |
8404 | end if; | |
8405 | ||
21d27997 RD |
8406 | -- Stream attributes for strings are expanded into library calls. The |
8407 | -- following checks are disabled when the run-time is not available or | |
8408 | -- when compiling predefined types due to bootstrap issues. As a result, | |
8409 | -- the compiler will generate in-place stream routines for string types | |
8410 | -- that appear in GNAT's library, but will generate calls via rtsfind | |
8411 | -- to library routines for user code. | |
f4b049db | 8412 | |
a20f4389 | 8413 | -- Note: In the case of using a configurable run time, it is very likely |
90878b12 AC |
8414 | -- that stream routines for string types are not present (they require |
8415 | -- file system support). In this case, the specific stream routines for | |
8416 | -- strings are not used, relying on the regular stream mechanism | |
6c9e4a1d | 8417 | -- instead. That is why we include the test RTE_Available when dealing |
a20f4389 | 8418 | -- with these cases. |
90878b12 | 8419 | |
8ab31c0c | 8420 | if not Is_Predefined_Unit (Current_Sem_Unit) then |
161c5cc5 AC |
8421 | -- Storage_Array as defined in package System.Storage_Elements |
8422 | ||
8423 | if Is_RTE (Base_Typ, RE_Storage_Array) then | |
8424 | ||
8425 | -- Case of No_Stream_Optimizations restriction active | |
8426 | ||
8427 | if Restriction_Active (No_Stream_Optimizations) then | |
8428 | if Nam = TSS_Stream_Input | |
6c9e4a1d | 8429 | and then RTE_Available (RE_Storage_Array_Input) |
161c5cc5 AC |
8430 | then |
8431 | return RTE (RE_Storage_Array_Input); | |
8432 | ||
8433 | elsif Nam = TSS_Stream_Output | |
6c9e4a1d | 8434 | and then RTE_Available (RE_Storage_Array_Output) |
161c5cc5 AC |
8435 | then |
8436 | return RTE (RE_Storage_Array_Output); | |
8437 | ||
8438 | elsif Nam = TSS_Stream_Read | |
6c9e4a1d | 8439 | and then RTE_Available (RE_Storage_Array_Read) |
161c5cc5 AC |
8440 | then |
8441 | return RTE (RE_Storage_Array_Read); | |
8442 | ||
8443 | elsif Nam = TSS_Stream_Write | |
6c9e4a1d | 8444 | and then RTE_Available (RE_Storage_Array_Write) |
161c5cc5 AC |
8445 | then |
8446 | return RTE (RE_Storage_Array_Write); | |
8447 | ||
8448 | elsif Nam /= TSS_Stream_Input and then | |
8449 | Nam /= TSS_Stream_Output and then | |
8450 | Nam /= TSS_Stream_Read and then | |
8451 | Nam /= TSS_Stream_Write | |
8452 | then | |
8453 | raise Program_Error; | |
8454 | end if; | |
8455 | ||
8456 | -- Restriction No_Stream_Optimizations is not set, so we can go | |
8457 | -- ahead and optimize using the block IO forms of the routines. | |
8458 | ||
8459 | else | |
8460 | if Nam = TSS_Stream_Input | |
6c9e4a1d | 8461 | and then RTE_Available (RE_Storage_Array_Input_Blk_IO) |
161c5cc5 AC |
8462 | then |
8463 | return RTE (RE_Storage_Array_Input_Blk_IO); | |
8464 | ||
8465 | elsif Nam = TSS_Stream_Output | |
6c9e4a1d | 8466 | and then RTE_Available (RE_Storage_Array_Output_Blk_IO) |
161c5cc5 AC |
8467 | then |
8468 | return RTE (RE_Storage_Array_Output_Blk_IO); | |
8469 | ||
8470 | elsif Nam = TSS_Stream_Read | |
6c9e4a1d | 8471 | and then RTE_Available (RE_Storage_Array_Read_Blk_IO) |
161c5cc5 AC |
8472 | then |
8473 | return RTE (RE_Storage_Array_Read_Blk_IO); | |
8474 | ||
8475 | elsif Nam = TSS_Stream_Write | |
6c9e4a1d | 8476 | and then RTE_Available (RE_Storage_Array_Write_Blk_IO) |
161c5cc5 AC |
8477 | then |
8478 | return RTE (RE_Storage_Array_Write_Blk_IO); | |
8479 | ||
8480 | elsif Nam /= TSS_Stream_Input and then | |
8481 | Nam /= TSS_Stream_Output and then | |
8482 | Nam /= TSS_Stream_Read and then | |
8483 | Nam /= TSS_Stream_Write | |
8484 | then | |
8485 | raise Program_Error; | |
8486 | end if; | |
8487 | end if; | |
8488 | ||
8489 | -- Stream_Element_Array as defined in package Ada.Streams | |
8490 | ||
8491 | elsif Is_RTE (Base_Typ, RE_Stream_Element_Array) then | |
8492 | ||
8493 | -- Case of No_Stream_Optimizations restriction active | |
8494 | ||
8495 | if Restriction_Active (No_Stream_Optimizations) then | |
8496 | if Nam = TSS_Stream_Input | |
6c9e4a1d | 8497 | and then RTE_Available (RE_Stream_Element_Array_Input) |
161c5cc5 AC |
8498 | then |
8499 | return RTE (RE_Stream_Element_Array_Input); | |
8500 | ||
8501 | elsif Nam = TSS_Stream_Output | |
6c9e4a1d | 8502 | and then RTE_Available (RE_Stream_Element_Array_Output) |
161c5cc5 AC |
8503 | then |
8504 | return RTE (RE_Stream_Element_Array_Output); | |
8505 | ||
8506 | elsif Nam = TSS_Stream_Read | |
6c9e4a1d | 8507 | and then RTE_Available (RE_Stream_Element_Array_Read) |
161c5cc5 AC |
8508 | then |
8509 | return RTE (RE_Stream_Element_Array_Read); | |
8510 | ||
8511 | elsif Nam = TSS_Stream_Write | |
6c9e4a1d | 8512 | and then RTE_Available (RE_Stream_Element_Array_Write) |
161c5cc5 AC |
8513 | then |
8514 | return RTE (RE_Stream_Element_Array_Write); | |
8515 | ||
8516 | elsif Nam /= TSS_Stream_Input and then | |
8517 | Nam /= TSS_Stream_Output and then | |
8518 | Nam /= TSS_Stream_Read and then | |
8519 | Nam /= TSS_Stream_Write | |
8520 | then | |
8521 | raise Program_Error; | |
8522 | end if; | |
8523 | ||
8524 | -- Restriction No_Stream_Optimizations is not set, so we can go | |
8525 | -- ahead and optimize using the block IO forms of the routines. | |
8526 | ||
8527 | else | |
8528 | if Nam = TSS_Stream_Input | |
6c9e4a1d | 8529 | and then RTE_Available (RE_Stream_Element_Array_Input_Blk_IO) |
161c5cc5 AC |
8530 | then |
8531 | return RTE (RE_Stream_Element_Array_Input_Blk_IO); | |
8532 | ||
8533 | elsif Nam = TSS_Stream_Output | |
6c9e4a1d | 8534 | and then RTE_Available (RE_Stream_Element_Array_Output_Blk_IO) |
161c5cc5 AC |
8535 | then |
8536 | return RTE (RE_Stream_Element_Array_Output_Blk_IO); | |
8537 | ||
8538 | elsif Nam = TSS_Stream_Read | |
6c9e4a1d | 8539 | and then RTE_Available (RE_Stream_Element_Array_Read_Blk_IO) |
161c5cc5 AC |
8540 | then |
8541 | return RTE (RE_Stream_Element_Array_Read_Blk_IO); | |
8542 | ||
8543 | elsif Nam = TSS_Stream_Write | |
6c9e4a1d | 8544 | and then RTE_Available (RE_Stream_Element_Array_Write_Blk_IO) |
161c5cc5 AC |
8545 | then |
8546 | return RTE (RE_Stream_Element_Array_Write_Blk_IO); | |
8547 | ||
8548 | elsif Nam /= TSS_Stream_Input and then | |
8549 | Nam /= TSS_Stream_Output and then | |
8550 | Nam /= TSS_Stream_Read and then | |
8551 | Nam /= TSS_Stream_Write | |
8552 | then | |
8553 | raise Program_Error; | |
8554 | end if; | |
8555 | end if; | |
8556 | ||
21d27997 RD |
8557 | -- String as defined in package Ada |
8558 | ||
161c5cc5 AC |
8559 | elsif Base_Typ = Standard_String then |
8560 | ||
8561 | -- Case of No_Stream_Optimizations restriction active | |
8562 | ||
585df50b | 8563 | if Restriction_Active (No_Stream_Optimizations) then |
90878b12 | 8564 | if Nam = TSS_Stream_Input |
6c9e4a1d | 8565 | and then RTE_Available (RE_String_Input) |
90878b12 | 8566 | then |
585df50b AC |
8567 | return RTE (RE_String_Input); |
8568 | ||
90878b12 | 8569 | elsif Nam = TSS_Stream_Output |
6c9e4a1d | 8570 | and then RTE_Available (RE_String_Output) |
90878b12 | 8571 | then |
585df50b AC |
8572 | return RTE (RE_String_Output); |
8573 | ||
90878b12 | 8574 | elsif Nam = TSS_Stream_Read |
6c9e4a1d | 8575 | and then RTE_Available (RE_String_Read) |
90878b12 | 8576 | then |
585df50b | 8577 | return RTE (RE_String_Read); |
21d27997 | 8578 | |
90878b12 | 8579 | elsif Nam = TSS_Stream_Write |
6c9e4a1d | 8580 | and then RTE_Available (RE_String_Write) |
90878b12 | 8581 | then |
585df50b | 8582 | return RTE (RE_String_Write); |
90878b12 AC |
8583 | |
8584 | elsif Nam /= TSS_Stream_Input and then | |
8585 | Nam /= TSS_Stream_Output and then | |
8586 | Nam /= TSS_Stream_Read and then | |
8587 | Nam /= TSS_Stream_Write | |
8588 | then | |
8589 | raise Program_Error; | |
585df50b AC |
8590 | end if; |
8591 | ||
161c5cc5 AC |
8592 | -- Restriction No_Stream_Optimizations is not set, so we can go |
8593 | -- ahead and optimize using the block IO forms of the routines. | |
8594 | ||
585df50b | 8595 | else |
90878b12 | 8596 | if Nam = TSS_Stream_Input |
6c9e4a1d | 8597 | and then RTE_Available (RE_String_Input_Blk_IO) |
90878b12 | 8598 | then |
585df50b | 8599 | return RTE (RE_String_Input_Blk_IO); |
21d27997 | 8600 | |
90878b12 | 8601 | elsif Nam = TSS_Stream_Output |
6c9e4a1d | 8602 | and then RTE_Available (RE_String_Output_Blk_IO) |
90878b12 | 8603 | then |
585df50b | 8604 | return RTE (RE_String_Output_Blk_IO); |
21d27997 | 8605 | |
90878b12 | 8606 | elsif Nam = TSS_Stream_Read |
6c9e4a1d | 8607 | and then RTE_Available (RE_String_Read_Blk_IO) |
90878b12 | 8608 | then |
585df50b AC |
8609 | return RTE (RE_String_Read_Blk_IO); |
8610 | ||
90878b12 | 8611 | elsif Nam = TSS_Stream_Write |
6c9e4a1d | 8612 | and then RTE_Available (RE_String_Write_Blk_IO) |
90878b12 | 8613 | then |
585df50b | 8614 | return RTE (RE_String_Write_Blk_IO); |
90878b12 | 8615 | |
161c5cc5 | 8616 | elsif Nam /= TSS_Stream_Input and then |
90878b12 | 8617 | Nam /= TSS_Stream_Output and then |
161c5cc5 | 8618 | Nam /= TSS_Stream_Read and then |
90878b12 AC |
8619 | Nam /= TSS_Stream_Write |
8620 | then | |
8621 | raise Program_Error; | |
585df50b | 8622 | end if; |
21d27997 RD |
8623 | end if; |
8624 | ||
8625 | -- Wide_String as defined in package Ada | |
8626 | ||
b2c6b35f | 8627 | elsif Base_Typ = Standard_Wide_String then |
161c5cc5 AC |
8628 | |
8629 | -- Case of No_Stream_Optimizations restriction active | |
8630 | ||
585df50b | 8631 | if Restriction_Active (No_Stream_Optimizations) then |
90878b12 | 8632 | if Nam = TSS_Stream_Input |
6c9e4a1d | 8633 | and then RTE_Available (RE_Wide_String_Input) |
90878b12 | 8634 | then |
585df50b AC |
8635 | return RTE (RE_Wide_String_Input); |
8636 | ||
90878b12 | 8637 | elsif Nam = TSS_Stream_Output |
6c9e4a1d | 8638 | and then RTE_Available (RE_Wide_String_Output) |
90878b12 | 8639 | then |
585df50b AC |
8640 | return RTE (RE_Wide_String_Output); |
8641 | ||
90878b12 | 8642 | elsif Nam = TSS_Stream_Read |
6c9e4a1d | 8643 | and then RTE_Available (RE_Wide_String_Read) |
90878b12 | 8644 | then |
585df50b AC |
8645 | return RTE (RE_Wide_String_Read); |
8646 | ||
90878b12 | 8647 | elsif Nam = TSS_Stream_Write |
6c9e4a1d | 8648 | and then RTE_Available (RE_Wide_String_Write) |
90878b12 | 8649 | then |
585df50b | 8650 | return RTE (RE_Wide_String_Write); |
90878b12 | 8651 | |
161c5cc5 | 8652 | elsif Nam /= TSS_Stream_Input and then |
90878b12 | 8653 | Nam /= TSS_Stream_Output and then |
161c5cc5 | 8654 | Nam /= TSS_Stream_Read and then |
90878b12 AC |
8655 | Nam /= TSS_Stream_Write |
8656 | then | |
8657 | raise Program_Error; | |
585df50b AC |
8658 | end if; |
8659 | ||
161c5cc5 AC |
8660 | -- Restriction No_Stream_Optimizations is not set, so we can go |
8661 | -- ahead and optimize using the block IO forms of the routines. | |
8662 | ||
585df50b | 8663 | else |
90878b12 | 8664 | if Nam = TSS_Stream_Input |
6c9e4a1d | 8665 | and then RTE_Available (RE_Wide_String_Input_Blk_IO) |
90878b12 | 8666 | then |
585df50b | 8667 | return RTE (RE_Wide_String_Input_Blk_IO); |
21d27997 | 8668 | |
90878b12 | 8669 | elsif Nam = TSS_Stream_Output |
6c9e4a1d | 8670 | and then RTE_Available (RE_Wide_String_Output_Blk_IO) |
90878b12 | 8671 | then |
585df50b | 8672 | return RTE (RE_Wide_String_Output_Blk_IO); |
21d27997 | 8673 | |
90878b12 | 8674 | elsif Nam = TSS_Stream_Read |
6c9e4a1d | 8675 | and then RTE_Available (RE_Wide_String_Read_Blk_IO) |
90878b12 | 8676 | then |
585df50b | 8677 | return RTE (RE_Wide_String_Read_Blk_IO); |
21d27997 | 8678 | |
90878b12 | 8679 | elsif Nam = TSS_Stream_Write |
6c9e4a1d | 8680 | and then RTE_Available (RE_Wide_String_Write_Blk_IO) |
90878b12 | 8681 | then |
585df50b | 8682 | return RTE (RE_Wide_String_Write_Blk_IO); |
90878b12 | 8683 | |
161c5cc5 | 8684 | elsif Nam /= TSS_Stream_Input and then |
90878b12 | 8685 | Nam /= TSS_Stream_Output and then |
161c5cc5 | 8686 | Nam /= TSS_Stream_Read and then |
90878b12 AC |
8687 | Nam /= TSS_Stream_Write |
8688 | then | |
8689 | raise Program_Error; | |
585df50b | 8690 | end if; |
21d27997 RD |
8691 | end if; |
8692 | ||
8693 | -- Wide_Wide_String as defined in package Ada | |
8694 | ||
b2c6b35f | 8695 | elsif Base_Typ = Standard_Wide_Wide_String then |
161c5cc5 AC |
8696 | |
8697 | -- Case of No_Stream_Optimizations restriction active | |
8698 | ||
585df50b | 8699 | if Restriction_Active (No_Stream_Optimizations) then |
90878b12 | 8700 | if Nam = TSS_Stream_Input |
6c9e4a1d | 8701 | and then RTE_Available (RE_Wide_Wide_String_Input) |
90878b12 | 8702 | then |
585df50b AC |
8703 | return RTE (RE_Wide_Wide_String_Input); |
8704 | ||
90878b12 | 8705 | elsif Nam = TSS_Stream_Output |
6c9e4a1d | 8706 | and then RTE_Available (RE_Wide_Wide_String_Output) |
90878b12 | 8707 | then |
585df50b | 8708 | return RTE (RE_Wide_Wide_String_Output); |
21d27997 | 8709 | |
90878b12 | 8710 | elsif Nam = TSS_Stream_Read |
6c9e4a1d | 8711 | and then RTE_Available (RE_Wide_Wide_String_Read) |
90878b12 | 8712 | then |
585df50b | 8713 | return RTE (RE_Wide_Wide_String_Read); |
21d27997 | 8714 | |
90878b12 | 8715 | elsif Nam = TSS_Stream_Write |
6c9e4a1d | 8716 | and then RTE_Available (RE_Wide_Wide_String_Write) |
90878b12 | 8717 | then |
585df50b | 8718 | return RTE (RE_Wide_Wide_String_Write); |
90878b12 | 8719 | |
161c5cc5 | 8720 | elsif Nam /= TSS_Stream_Input and then |
90878b12 | 8721 | Nam /= TSS_Stream_Output and then |
161c5cc5 | 8722 | Nam /= TSS_Stream_Read and then |
90878b12 AC |
8723 | Nam /= TSS_Stream_Write |
8724 | then | |
8725 | raise Program_Error; | |
585df50b | 8726 | end if; |
21d27997 | 8727 | |
161c5cc5 AC |
8728 | -- Restriction No_Stream_Optimizations is not set, so we can go |
8729 | -- ahead and optimize using the block IO forms of the routines. | |
8730 | ||
585df50b | 8731 | else |
90878b12 | 8732 | if Nam = TSS_Stream_Input |
6c9e4a1d | 8733 | and then RTE_Available (RE_Wide_Wide_String_Input_Blk_IO) |
90878b12 | 8734 | then |
585df50b AC |
8735 | return RTE (RE_Wide_Wide_String_Input_Blk_IO); |
8736 | ||
90878b12 | 8737 | elsif Nam = TSS_Stream_Output |
6c9e4a1d | 8738 | and then RTE_Available (RE_Wide_Wide_String_Output_Blk_IO) |
90878b12 | 8739 | then |
585df50b AC |
8740 | return RTE (RE_Wide_Wide_String_Output_Blk_IO); |
8741 | ||
90878b12 | 8742 | elsif Nam = TSS_Stream_Read |
6c9e4a1d | 8743 | and then RTE_Available (RE_Wide_Wide_String_Read_Blk_IO) |
90878b12 | 8744 | then |
585df50b AC |
8745 | return RTE (RE_Wide_Wide_String_Read_Blk_IO); |
8746 | ||
90878b12 | 8747 | elsif Nam = TSS_Stream_Write |
6c9e4a1d | 8748 | and then RTE_Available (RE_Wide_Wide_String_Write_Blk_IO) |
90878b12 | 8749 | then |
585df50b | 8750 | return RTE (RE_Wide_Wide_String_Write_Blk_IO); |
90878b12 | 8751 | |
161c5cc5 | 8752 | elsif Nam /= TSS_Stream_Input and then |
90878b12 | 8753 | Nam /= TSS_Stream_Output and then |
161c5cc5 | 8754 | Nam /= TSS_Stream_Read and then |
90878b12 AC |
8755 | Nam /= TSS_Stream_Write |
8756 | then | |
8757 | raise Program_Error; | |
585df50b | 8758 | end if; |
21d27997 RD |
8759 | end if; |
8760 | end if; | |
8761 | end if; | |
8762 | ||
161c5cc5 | 8763 | if Is_Tagged_Type (Typ) and then Is_Derived_Type (Typ) then |
fbf5a39b AC |
8764 | return Find_Prim_Op (Typ, Nam); |
8765 | else | |
8766 | return Find_Inherited_TSS (Typ, Nam); | |
8767 | end if; | |
8768 | end Find_Stream_Subprogram; | |
8769 | ||
96d2756f AC |
8770 | --------------- |
8771 | -- Full_Base -- | |
8772 | --------------- | |
8773 | ||
8774 | function Full_Base (T : Entity_Id) return Entity_Id is | |
8775 | BT : Entity_Id; | |
8776 | ||
8777 | begin | |
8778 | BT := Base_Type (T); | |
8779 | ||
8780 | if Is_Private_Type (BT) | |
8781 | and then Present (Full_View (BT)) | |
8782 | then | |
8783 | BT := Full_View (BT); | |
8784 | end if; | |
8785 | ||
8786 | return BT; | |
8787 | end Full_Base; | |
8788 | ||
1d571f3b AC |
8789 | ------------------------------- |
8790 | -- Get_Stream_Convert_Pragma -- | |
8791 | ------------------------------- | |
8792 | ||
8793 | function Get_Stream_Convert_Pragma (T : Entity_Id) return Node_Id is | |
8794 | Typ : Entity_Id; | |
8795 | N : Node_Id; | |
8796 | ||
8797 | begin | |
8798 | -- Note: we cannot use Get_Rep_Pragma here because of the peculiarity | |
8799 | -- that a stream convert pragma for a tagged type is not inherited from | |
8800 | -- its parent. Probably what is wrong here is that it is basically | |
8801 | -- incorrect to consider a stream convert pragma to be a representation | |
8802 | -- pragma at all ??? | |
8803 | ||
8804 | N := First_Rep_Item (Implementation_Base_Type (T)); | |
8805 | while Present (N) loop | |
e10dab7f | 8806 | if Nkind (N) = N_Pragma |
6e759c2a | 8807 | and then Pragma_Name (N) = Name_Stream_Convert |
e10dab7f | 8808 | then |
1d571f3b AC |
8809 | -- For tagged types this pragma is not inherited, so we |
8810 | -- must verify that it is defined for the given type and | |
8811 | -- not an ancestor. | |
8812 | ||
8813 | Typ := | |
8814 | Entity (Expression (First (Pragma_Argument_Associations (N)))); | |
8815 | ||
8816 | if not Is_Tagged_Type (T) | |
8817 | or else T = Typ | |
8818 | or else (Is_Private_Type (Typ) and then T = Full_View (Typ)) | |
8819 | then | |
8820 | return N; | |
8821 | end if; | |
8822 | end if; | |
8823 | ||
8824 | Next_Rep_Item (N); | |
8825 | end loop; | |
8826 | ||
8827 | return Empty; | |
8828 | end Get_Stream_Convert_Pragma; | |
8829 | ||
70482933 RK |
8830 | --------------------------------- |
8831 | -- Is_Constrained_Packed_Array -- | |
8832 | --------------------------------- | |
8833 | ||
8834 | function Is_Constrained_Packed_Array (Typ : Entity_Id) return Boolean is | |
8835 | Arr : Entity_Id := Typ; | |
8836 | ||
8837 | begin | |
8838 | if Is_Access_Type (Arr) then | |
8839 | Arr := Designated_Type (Arr); | |
8840 | end if; | |
8841 | ||
8842 | return Is_Array_Type (Arr) | |
8843 | and then Is_Constrained (Arr) | |
8ca597af | 8844 | and then Present (Packed_Array_Impl_Type (Arr)); |
70482933 RK |
8845 | end Is_Constrained_Packed_Array; |
8846 | ||
0669bebe GB |
8847 | ---------------------------------------- |
8848 | -- Is_Inline_Floating_Point_Attribute -- | |
8849 | ---------------------------------------- | |
8850 | ||
8851 | function Is_Inline_Floating_Point_Attribute (N : Node_Id) return Boolean is | |
8852 | Id : constant Attribute_Id := Get_Attribute_Id (Attribute_Name (N)); | |
8853 | ||
d18bbd25 AC |
8854 | function Is_GCC_Target return Boolean; |
8855 | -- Return True if we are using a GCC target/back-end | |
8856 | -- ??? Note: the implementation is kludgy/fragile | |
8857 | ||
8858 | ------------------- | |
8859 | -- Is_GCC_Target -- | |
8860 | ------------------- | |
8861 | ||
8862 | function Is_GCC_Target return Boolean is | |
8863 | begin | |
9a476d75 | 8864 | return not CodePeer_Mode |
c63a2ad6 | 8865 | and then not Modify_Tree_For_C; |
d18bbd25 AC |
8866 | end Is_GCC_Target; |
8867 | ||
b943a971 | 8868 | -- Start of processing for Is_Inline_Floating_Point_Attribute |
d18bbd25 | 8869 | |
0669bebe | 8870 | begin |
56af8688 | 8871 | -- Machine and Model can be expanded by the GCC back end only |
78433fec | 8872 | |
24228312 | 8873 | if Id = Attribute_Machine or else Id = Attribute_Model then |
f8f50235 | 8874 | return Is_GCC_Target; |
78433fec | 8875 | |
d18bbd25 | 8876 | -- Remaining cases handled by all back ends are Rounding and Truncation |
78433fec | 8877 | -- when appearing as the operand of a conversion to some integer type. |
24228312 AC |
8878 | |
8879 | elsif Nkind (Parent (N)) /= N_Type_Conversion | |
0669bebe GB |
8880 | or else not Is_Integer_Type (Etype (Parent (N))) |
8881 | then | |
8882 | return False; | |
8883 | end if; | |
8884 | ||
d8ec2787 EB |
8885 | -- Here we are in the integer conversion context. We reuse Rounding for |
8886 | -- Machine_Rounding as System.Fat_Gen, which is a permissible behavior. | |
78433fec | 8887 | |
d8ec2787 EB |
8888 | return |
8889 | Id = Attribute_Rounding | |
8890 | or else Id = Attribute_Machine_Rounding | |
8891 | or else Id = Attribute_Truncation; | |
0669bebe GB |
8892 | end Is_Inline_Floating_Point_Attribute; |
8893 | ||
70482933 | 8894 | end Exp_Attr; |