|
111
|
1 ------------------------------------------------------------------------------
|
|
|
2 -- --
|
|
|
3 -- GNAT COMPILER COMPONENTS --
|
|
|
4 -- --
|
|
|
5 -- E X P _ S T R M --
|
|
|
6 -- --
|
|
|
7 -- B o d y --
|
|
|
8 -- --
|
|
131
|
9 -- Copyright (C) 1992-2018, Free Software Foundation, Inc. --
|
|
111
|
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- --
|
|
|
13 -- ware Foundation; either version 3, or (at your option) any later ver- --
|
|
|
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
|
|
|
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
|
|
|
16 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
|
|
|
17 -- for more details. You should have received a copy of the GNU General --
|
|
|
18 -- Public License distributed with GNAT; see file COPYING3. If not, go to --
|
|
|
19 -- http://www.gnu.org/licenses for a complete copy of the license. --
|
|
|
20 -- --
|
|
|
21 -- GNAT was originally developed by the GNAT team at New York University. --
|
|
|
22 -- Extensive contributions were provided by Ada Core Technologies Inc. --
|
|
|
23 -- --
|
|
|
24 ------------------------------------------------------------------------------
|
|
|
25
|
|
|
26 with Atree; use Atree;
|
|
|
27 with Einfo; use Einfo;
|
|
|
28 with Elists; use Elists;
|
|
|
29 with Exp_Util; use Exp_Util;
|
|
|
30 with Namet; use Namet;
|
|
|
31 with Nlists; use Nlists;
|
|
|
32 with Nmake; use Nmake;
|
|
|
33 with Rtsfind; use Rtsfind;
|
|
|
34 with Sem_Aux; use Sem_Aux;
|
|
|
35 with Sem_Util; use Sem_Util;
|
|
|
36 with Sinfo; use Sinfo;
|
|
|
37 with Snames; use Snames;
|
|
|
38 with Stand; use Stand;
|
|
|
39 with Tbuild; use Tbuild;
|
|
|
40 with Ttypes; use Ttypes;
|
|
|
41 with Uintp; use Uintp;
|
|
|
42
|
|
|
43 package body Exp_Strm is
|
|
|
44
|
|
|
45 -----------------------
|
|
|
46 -- Local Subprograms --
|
|
|
47 -----------------------
|
|
|
48
|
|
|
49 procedure Build_Array_Read_Write_Procedure
|
|
|
50 (Nod : Node_Id;
|
|
|
51 Typ : Entity_Id;
|
|
|
52 Decl : out Node_Id;
|
|
|
53 Pnam : Entity_Id;
|
|
|
54 Nam : Name_Id);
|
|
|
55 -- Common routine shared to build either an array Read procedure or an
|
|
|
56 -- array Write procedure, Nam is Name_Read or Name_Write to select which.
|
|
|
57 -- Pnam is the defining identifier for the constructed procedure. The
|
|
|
58 -- other parameters are as for Build_Array_Read_Procedure except that
|
|
|
59 -- the first parameter Nod supplies the Sloc to be used to generate code.
|
|
|
60
|
|
|
61 procedure Build_Record_Read_Write_Procedure
|
|
|
62 (Loc : Source_Ptr;
|
|
|
63 Typ : Entity_Id;
|
|
|
64 Decl : out Node_Id;
|
|
|
65 Pnam : Entity_Id;
|
|
|
66 Nam : Name_Id);
|
|
|
67 -- Common routine shared to build a record Read Write procedure, Nam
|
|
|
68 -- is Name_Read or Name_Write to select which. Pnam is the defining
|
|
|
69 -- identifier for the constructed procedure. The other parameters are
|
|
|
70 -- as for Build_Record_Read_Procedure.
|
|
|
71
|
|
|
72 procedure Build_Stream_Function
|
|
|
73 (Loc : Source_Ptr;
|
|
|
74 Typ : Entity_Id;
|
|
|
75 Decl : out Node_Id;
|
|
|
76 Fnam : Entity_Id;
|
|
|
77 Decls : List_Id;
|
|
|
78 Stms : List_Id);
|
|
|
79 -- Called to build an array or record stream function. The first three
|
|
|
80 -- arguments are the same as Build_Record_Or_Elementary_Input_Function.
|
|
|
81 -- Decls and Stms are the declarations and statements for the body and
|
|
|
82 -- The parameter Fnam is the name of the constructed function.
|
|
|
83
|
|
|
84 function Has_Stream_Standard_Rep (U_Type : Entity_Id) return Boolean;
|
|
|
85 -- This function is used to test the type U_Type, to determine if it has
|
|
|
86 -- a standard representation from a streaming point of view. Standard means
|
|
|
87 -- that it has a standard representation (e.g. no enumeration rep clause),
|
|
|
88 -- and the size of the root type is the same as the streaming size (which
|
|
|
89 -- is defined as value specified by a Stream_Size clause if present, or
|
|
|
90 -- the Esize of U_Type if not).
|
|
|
91
|
|
|
92 function Make_Stream_Subprogram_Name
|
|
|
93 (Loc : Source_Ptr;
|
|
|
94 Typ : Entity_Id;
|
|
|
95 Nam : TSS_Name_Type) return Entity_Id;
|
|
|
96 -- Return the entity that identifies the stream subprogram for type Typ
|
|
|
97 -- that is identified by the given Nam. This procedure deals with the
|
|
|
98 -- difference between tagged types (where a single subprogram associated
|
|
|
99 -- with the type is generated) and all other cases (where a subprogram
|
|
|
100 -- is generated at the point of the stream attribute reference). The
|
|
|
101 -- Loc parameter is used as the Sloc of the created entity.
|
|
|
102
|
|
|
103 function Stream_Base_Type (E : Entity_Id) return Entity_Id;
|
|
|
104 -- Stream attributes work on the basis of the base type except for the
|
|
|
105 -- array case. For the array case, we do not go to the base type, but
|
|
|
106 -- to the first subtype if it is constrained. This avoids problems with
|
|
|
107 -- incorrect conversions in the packed array case. Stream_Base_Type is
|
|
|
108 -- exactly this function (returns the base type, unless we have an array
|
|
|
109 -- type whose first subtype is constrained, in which case it returns the
|
|
|
110 -- first subtype).
|
|
|
111
|
|
|
112 --------------------------------
|
|
|
113 -- Build_Array_Input_Function --
|
|
|
114 --------------------------------
|
|
|
115
|
|
|
116 -- The function we build looks like
|
|
|
117
|
|
|
118 -- function typSI[_nnn] (S : access RST) return Typ is
|
|
|
119 -- L1 : constant Index_Type_1 := Index_Type_1'Input (S);
|
|
|
120 -- H1 : constant Index_Type_1 := Index_Type_1'Input (S);
|
|
|
121 -- L2 : constant Index_Type_2 := Index_Type_2'Input (S);
|
|
|
122 -- H2 : constant Index_Type_2 := Index_Type_2'Input (S);
|
|
|
123 -- ..
|
|
|
124 -- Ln : constant Index_Type_n := Index_Type_n'Input (S);
|
|
|
125 -- Hn : constant Index_Type_n := Index_Type_n'Input (S);
|
|
|
126 --
|
|
|
127 -- V : Typ'Base (L1 .. H1, L2 .. H2, ... Ln .. Hn)
|
|
|
128
|
|
|
129 -- begin
|
|
|
130 -- Typ'Read (S, V);
|
|
|
131 -- return V;
|
|
|
132 -- end typSI[_nnn]
|
|
|
133
|
|
|
134 -- Note: the suffix [_nnn] is present for untagged types, where we generate
|
|
|
135 -- a local subprogram at the point of the occurrence of the attribute
|
|
|
136 -- reference, so the name must be unique.
|
|
|
137
|
|
|
138 procedure Build_Array_Input_Function
|
|
|
139 (Loc : Source_Ptr;
|
|
|
140 Typ : Entity_Id;
|
|
|
141 Decl : out Node_Id;
|
|
|
142 Fnam : out Entity_Id)
|
|
|
143 is
|
|
|
144 Dim : constant Pos := Number_Dimensions (Typ);
|
|
|
145 Lnam : Name_Id;
|
|
|
146 Hnam : Name_Id;
|
|
|
147 Decls : List_Id;
|
|
|
148 Ranges : List_Id;
|
|
|
149 Stms : List_Id;
|
|
|
150 Rstmt : Node_Id;
|
|
|
151 Indx : Node_Id;
|
|
|
152 Odecl : Node_Id;
|
|
|
153
|
|
|
154 begin
|
|
|
155 Decls := New_List;
|
|
|
156 Ranges := New_List;
|
|
|
157 Indx := First_Index (Typ);
|
|
|
158 for J in 1 .. Dim loop
|
|
|
159 Lnam := New_External_Name ('L', J);
|
|
|
160 Hnam := New_External_Name ('H', J);
|
|
|
161
|
|
|
162 Append_To (Decls,
|
|
|
163 Make_Object_Declaration (Loc,
|
|
|
164 Defining_Identifier => Make_Defining_Identifier (Loc, Lnam),
|
|
|
165 Constant_Present => True,
|
|
|
166 Object_Definition => New_Occurrence_Of (Etype (Indx), Loc),
|
|
|
167 Expression =>
|
|
|
168 Make_Attribute_Reference (Loc,
|
|
|
169 Prefix =>
|
|
|
170 New_Occurrence_Of (Stream_Base_Type (Etype (Indx)), Loc),
|
|
|
171 Attribute_Name => Name_Input,
|
|
|
172 Expressions => New_List (Make_Identifier (Loc, Name_S)))));
|
|
|
173
|
|
|
174 Append_To (Decls,
|
|
|
175 Make_Object_Declaration (Loc,
|
|
|
176 Defining_Identifier => Make_Defining_Identifier (Loc, Hnam),
|
|
|
177 Constant_Present => True,
|
|
|
178 Object_Definition =>
|
|
|
179 New_Occurrence_Of (Stream_Base_Type (Etype (Indx)), Loc),
|
|
|
180 Expression =>
|
|
|
181 Make_Attribute_Reference (Loc,
|
|
|
182 Prefix =>
|
|
|
183 New_Occurrence_Of (Stream_Base_Type (Etype (Indx)), Loc),
|
|
|
184 Attribute_Name => Name_Input,
|
|
|
185 Expressions => New_List (Make_Identifier (Loc, Name_S)))));
|
|
|
186
|
|
|
187 Append_To (Ranges,
|
|
|
188 Make_Range (Loc,
|
|
|
189 Low_Bound => Make_Identifier (Loc, Lnam),
|
|
|
190 High_Bound => Make_Identifier (Loc, Hnam)));
|
|
|
191
|
|
|
192 Next_Index (Indx);
|
|
|
193 end loop;
|
|
|
194
|
|
|
195 -- If the type is constrained, use it directly. Otherwise build a
|
|
|
196 -- subtype indication with the proper bounds.
|
|
|
197
|
|
|
198 if Is_Constrained (Typ) then
|
|
|
199 Odecl :=
|
|
|
200 Make_Object_Declaration (Loc,
|
|
|
201 Defining_Identifier => Make_Defining_Identifier (Loc, Name_V),
|
|
|
202 Object_Definition => New_Occurrence_Of (Typ, Loc));
|
|
|
203
|
|
|
204 else
|
|
|
205 Odecl :=
|
|
|
206 Make_Object_Declaration (Loc,
|
|
|
207 Defining_Identifier => Make_Defining_Identifier (Loc, Name_V),
|
|
|
208 Object_Definition =>
|
|
|
209 Make_Subtype_Indication (Loc,
|
|
|
210 Subtype_Mark =>
|
|
|
211 New_Occurrence_Of (Stream_Base_Type (Typ), Loc),
|
|
|
212 Constraint =>
|
|
|
213 Make_Index_Or_Discriminant_Constraint (Loc, Ranges)));
|
|
|
214 end if;
|
|
|
215
|
|
|
216 Rstmt :=
|
|
|
217 Make_Attribute_Reference (Loc,
|
|
|
218 Prefix => New_Occurrence_Of (Typ, Loc),
|
|
|
219 Attribute_Name => Name_Read,
|
|
|
220 Expressions => New_List (
|
|
|
221 Make_Identifier (Loc, Name_S),
|
|
|
222 Make_Identifier (Loc, Name_V)));
|
|
|
223
|
|
|
224 Stms := New_List (
|
|
|
225 Make_Extended_Return_Statement (Loc,
|
|
|
226 Return_Object_Declarations => New_List (Odecl),
|
|
|
227 Handled_Statement_Sequence =>
|
|
|
228 Make_Handled_Sequence_Of_Statements (Loc, New_List (Rstmt))));
|
|
|
229
|
|
|
230 Fnam :=
|
|
|
231 Make_Defining_Identifier (Loc,
|
|
|
232 Chars => Make_TSS_Name_Local (Typ, TSS_Stream_Input));
|
|
|
233
|
|
|
234 Build_Stream_Function (Loc, Typ, Decl, Fnam, Decls, Stms);
|
|
|
235 end Build_Array_Input_Function;
|
|
|
236
|
|
|
237 ----------------------------------
|
|
|
238 -- Build_Array_Output_Procedure --
|
|
|
239 ----------------------------------
|
|
|
240
|
|
|
241 procedure Build_Array_Output_Procedure
|
|
|
242 (Loc : Source_Ptr;
|
|
|
243 Typ : Entity_Id;
|
|
|
244 Decl : out Node_Id;
|
|
|
245 Pnam : out Entity_Id)
|
|
|
246 is
|
|
|
247 Stms : List_Id;
|
|
|
248 Indx : Node_Id;
|
|
|
249
|
|
|
250 begin
|
|
|
251 -- Build series of statements to output bounds
|
|
|
252
|
|
|
253 Indx := First_Index (Typ);
|
|
|
254 Stms := New_List;
|
|
|
255
|
|
|
256 for J in 1 .. Number_Dimensions (Typ) loop
|
|
|
257 Append_To (Stms,
|
|
|
258 Make_Attribute_Reference (Loc,
|
|
|
259 Prefix =>
|
|
|
260 New_Occurrence_Of (Stream_Base_Type (Etype (Indx)), Loc),
|
|
|
261 Attribute_Name => Name_Write,
|
|
|
262 Expressions => New_List (
|
|
|
263 Make_Identifier (Loc, Name_S),
|
|
|
264 Make_Attribute_Reference (Loc,
|
|
|
265 Prefix => Make_Identifier (Loc, Name_V),
|
|
|
266 Attribute_Name => Name_First,
|
|
|
267 Expressions => New_List (
|
|
|
268 Make_Integer_Literal (Loc, J))))));
|
|
|
269
|
|
|
270 Append_To (Stms,
|
|
|
271 Make_Attribute_Reference (Loc,
|
|
|
272 Prefix =>
|
|
|
273 New_Occurrence_Of (Stream_Base_Type (Etype (Indx)), Loc),
|
|
|
274 Attribute_Name => Name_Write,
|
|
|
275 Expressions => New_List (
|
|
|
276 Make_Identifier (Loc, Name_S),
|
|
|
277 Make_Attribute_Reference (Loc,
|
|
|
278 Prefix => Make_Identifier (Loc, Name_V),
|
|
|
279 Attribute_Name => Name_Last,
|
|
|
280 Expressions => New_List (
|
|
|
281 Make_Integer_Literal (Loc, J))))));
|
|
|
282
|
|
|
283 Next_Index (Indx);
|
|
|
284 end loop;
|
|
|
285
|
|
|
286 -- Append Write attribute to write array elements
|
|
|
287
|
|
|
288 Append_To (Stms,
|
|
|
289 Make_Attribute_Reference (Loc,
|
|
|
290 Prefix => New_Occurrence_Of (Typ, Loc),
|
|
|
291 Attribute_Name => Name_Write,
|
|
|
292 Expressions => New_List (
|
|
|
293 Make_Identifier (Loc, Name_S),
|
|
|
294 Make_Identifier (Loc, Name_V))));
|
|
|
295
|
|
|
296 Pnam :=
|
|
|
297 Make_Defining_Identifier (Loc,
|
|
|
298 Chars => Make_TSS_Name_Local (Typ, TSS_Stream_Output));
|
|
|
299
|
|
|
300 Build_Stream_Procedure (Loc, Typ, Decl, Pnam, Stms, False);
|
|
|
301 end Build_Array_Output_Procedure;
|
|
|
302
|
|
|
303 --------------------------------
|
|
|
304 -- Build_Array_Read_Procedure --
|
|
|
305 --------------------------------
|
|
|
306
|
|
|
307 procedure Build_Array_Read_Procedure
|
|
|
308 (Nod : Node_Id;
|
|
|
309 Typ : Entity_Id;
|
|
|
310 Decl : out Node_Id;
|
|
|
311 Pnam : out Entity_Id)
|
|
|
312 is
|
|
|
313 Loc : constant Source_Ptr := Sloc (Nod);
|
|
|
314
|
|
|
315 begin
|
|
|
316 Pnam :=
|
|
|
317 Make_Defining_Identifier (Loc,
|
|
|
318 Chars => Make_TSS_Name_Local (Typ, TSS_Stream_Read));
|
|
|
319 Build_Array_Read_Write_Procedure (Nod, Typ, Decl, Pnam, Name_Read);
|
|
|
320 end Build_Array_Read_Procedure;
|
|
|
321
|
|
|
322 --------------------------------------
|
|
|
323 -- Build_Array_Read_Write_Procedure --
|
|
|
324 --------------------------------------
|
|
|
325
|
|
|
326 -- The form of the array read/write procedure is as follows:
|
|
|
327
|
|
|
328 -- procedure pnam (S : access RST, V : [out] Typ) is
|
|
|
329 -- begin
|
|
|
330 -- for L1 in V'Range (1) loop
|
|
|
331 -- for L2 in V'Range (2) loop
|
|
|
332 -- ...
|
|
|
333 -- for Ln in V'Range (n) loop
|
|
|
334 -- Component_Type'Read/Write (S, V (L1, L2, .. Ln));
|
|
|
335 -- end loop;
|
|
|
336 -- ..
|
|
|
337 -- end loop;
|
|
|
338 -- end loop
|
|
|
339 -- end pnam;
|
|
|
340
|
|
|
341 -- The out keyword for V is supplied in the Read case
|
|
|
342
|
|
|
343 procedure Build_Array_Read_Write_Procedure
|
|
|
344 (Nod : Node_Id;
|
|
|
345 Typ : Entity_Id;
|
|
|
346 Decl : out Node_Id;
|
|
|
347 Pnam : Entity_Id;
|
|
|
348 Nam : Name_Id)
|
|
|
349 is
|
|
|
350 Loc : constant Source_Ptr := Sloc (Nod);
|
|
|
351 Ndim : constant Pos := Number_Dimensions (Typ);
|
|
|
352 Ctyp : constant Entity_Id := Component_Type (Typ);
|
|
|
353
|
|
|
354 Stm : Node_Id;
|
|
|
355 Exl : List_Id;
|
|
|
356 RW : Entity_Id;
|
|
|
357
|
|
|
358 begin
|
|
|
359 -- First build the inner attribute call
|
|
|
360
|
|
|
361 Exl := New_List;
|
|
|
362
|
|
|
363 for J in 1 .. Ndim loop
|
|
|
364 Append_To (Exl, Make_Identifier (Loc, New_External_Name ('L', J)));
|
|
|
365 end loop;
|
|
|
366
|
|
|
367 Stm :=
|
|
|
368 Make_Attribute_Reference (Loc,
|
|
|
369 Prefix => New_Occurrence_Of (Stream_Base_Type (Ctyp), Loc),
|
|
|
370 Attribute_Name => Nam,
|
|
|
371 Expressions => New_List (
|
|
|
372 Make_Identifier (Loc, Name_S),
|
|
|
373 Make_Indexed_Component (Loc,
|
|
|
374 Prefix => Make_Identifier (Loc, Name_V),
|
|
|
375 Expressions => Exl)));
|
|
|
376
|
|
|
377 -- The corresponding stream attribute for the component type of the
|
|
|
378 -- array may be user-defined, and be frozen after the type for which
|
|
|
379 -- we are generating the stream subprogram. In that case, freeze the
|
|
|
380 -- stream attribute of the component type, whose declaration could not
|
|
|
381 -- generate any additional freezing actions in any case.
|
|
|
382
|
|
|
383 if Nam = Name_Read then
|
|
|
384 RW := TSS (Base_Type (Ctyp), TSS_Stream_Read);
|
|
|
385 else
|
|
|
386 RW := TSS (Base_Type (Ctyp), TSS_Stream_Write);
|
|
|
387 end if;
|
|
|
388
|
|
|
389 if Present (RW)
|
|
|
390 and then not Is_Frozen (RW)
|
|
|
391 then
|
|
|
392 Set_Is_Frozen (RW);
|
|
|
393 end if;
|
|
|
394
|
|
|
395 -- Now this is the big loop to wrap that statement up in a sequence
|
|
|
396 -- of loops. The first time around, Stm is the attribute call. The
|
|
|
397 -- second and subsequent times, Stm is an inner loop.
|
|
|
398
|
|
|
399 for J in 1 .. Ndim loop
|
|
|
400 Stm :=
|
|
|
401 Make_Implicit_Loop_Statement (Nod,
|
|
|
402 Iteration_Scheme =>
|
|
|
403 Make_Iteration_Scheme (Loc,
|
|
|
404 Loop_Parameter_Specification =>
|
|
|
405 Make_Loop_Parameter_Specification (Loc,
|
|
|
406 Defining_Identifier =>
|
|
|
407 Make_Defining_Identifier (Loc,
|
|
|
408 Chars => New_External_Name ('L', Ndim - J + 1)),
|
|
|
409
|
|
|
410 Discrete_Subtype_Definition =>
|
|
|
411 Make_Attribute_Reference (Loc,
|
|
|
412 Prefix => Make_Identifier (Loc, Name_V),
|
|
|
413 Attribute_Name => Name_Range,
|
|
|
414
|
|
|
415 Expressions => New_List (
|
|
|
416 Make_Integer_Literal (Loc, Ndim - J + 1))))),
|
|
|
417
|
|
|
418 Statements => New_List (Stm));
|
|
|
419
|
|
|
420 end loop;
|
|
|
421
|
|
|
422 Build_Stream_Procedure
|
|
|
423 (Loc, Typ, Decl, Pnam, New_List (Stm), Nam = Name_Read);
|
|
|
424 end Build_Array_Read_Write_Procedure;
|
|
|
425
|
|
|
426 ---------------------------------
|
|
|
427 -- Build_Array_Write_Procedure --
|
|
|
428 ---------------------------------
|
|
|
429
|
|
|
430 procedure Build_Array_Write_Procedure
|
|
|
431 (Nod : Node_Id;
|
|
|
432 Typ : Entity_Id;
|
|
|
433 Decl : out Node_Id;
|
|
|
434 Pnam : out Entity_Id)
|
|
|
435 is
|
|
|
436 Loc : constant Source_Ptr := Sloc (Nod);
|
|
|
437 begin
|
|
|
438 Pnam :=
|
|
|
439 Make_Defining_Identifier (Loc,
|
|
|
440 Chars => Make_TSS_Name_Local (Typ, TSS_Stream_Write));
|
|
|
441 Build_Array_Read_Write_Procedure (Nod, Typ, Decl, Pnam, Name_Write);
|
|
|
442 end Build_Array_Write_Procedure;
|
|
|
443
|
|
|
444 ---------------------------------
|
|
|
445 -- Build_Elementary_Input_Call --
|
|
|
446 ---------------------------------
|
|
|
447
|
|
|
448 function Build_Elementary_Input_Call (N : Node_Id) return Node_Id is
|
|
|
449 Loc : constant Source_Ptr := Sloc (N);
|
|
|
450 P_Type : constant Entity_Id := Entity (Prefix (N));
|
|
|
451 U_Type : constant Entity_Id := Underlying_Type (P_Type);
|
|
|
452 Rt_Type : constant Entity_Id := Root_Type (U_Type);
|
|
|
453 FST : constant Entity_Id := First_Subtype (U_Type);
|
|
|
454 Strm : constant Node_Id := First (Expressions (N));
|
|
|
455 Targ : constant Node_Id := Next (Strm);
|
|
|
456 P_Size : constant Uint := Get_Stream_Size (FST);
|
|
|
457 Res : Node_Id;
|
|
|
458 Lib_RE : RE_Id;
|
|
|
459
|
|
|
460 begin
|
|
|
461
|
|
|
462 -- Check first for Boolean and Character. These are enumeration types,
|
|
|
463 -- but we treat them specially, since they may require special handling
|
|
|
464 -- in the transfer protocol. However, this special handling only applies
|
|
|
465 -- if they have standard representation, otherwise they are treated like
|
|
|
466 -- any other enumeration type.
|
|
|
467
|
|
|
468 if Rt_Type = Standard_Boolean
|
|
|
469 and then Has_Stream_Standard_Rep (U_Type)
|
|
|
470 then
|
|
|
471 Lib_RE := RE_I_B;
|
|
|
472
|
|
|
473 elsif Rt_Type = Standard_Character
|
|
|
474 and then Has_Stream_Standard_Rep (U_Type)
|
|
|
475 then
|
|
|
476 Lib_RE := RE_I_C;
|
|
|
477
|
|
|
478 elsif Rt_Type = Standard_Wide_Character
|
|
|
479 and then Has_Stream_Standard_Rep (U_Type)
|
|
|
480 then
|
|
|
481 Lib_RE := RE_I_WC;
|
|
|
482
|
|
|
483 elsif Rt_Type = Standard_Wide_Wide_Character
|
|
|
484 and then Has_Stream_Standard_Rep (U_Type)
|
|
|
485 then
|
|
|
486 Lib_RE := RE_I_WWC;
|
|
|
487
|
|
|
488 -- Floating point types
|
|
|
489
|
|
|
490 elsif Is_Floating_Point_Type (U_Type) then
|
|
|
491
|
|
|
492 -- Question: should we use P_Size or Rt_Type to distinguish between
|
|
|
493 -- possible floating point types? If a non-standard size or a stream
|
|
|
494 -- size is specified, then we should certainly use the size. But if
|
|
|
495 -- we have two types the same (notably Short_Float_Size = Float_Size
|
|
|
496 -- which is close to universally true, and Long_Long_Float_Size =
|
|
|
497 -- Long_Float_Size, true on most targets except the x86), then we
|
|
|
498 -- would really rather use the root type, so that if people want to
|
|
|
499 -- fiddle with System.Stream_Attributes to get inter-target portable
|
|
|
500 -- streams, they get the size they expect. Consider in particular the
|
|
|
501 -- case of a stream written on an x86, with 96-bit Long_Long_Float
|
|
|
502 -- being read into a non-x86 target with 64 bit Long_Long_Float. A
|
|
|
503 -- special version of System.Stream_Attributes can deal with this
|
|
|
504 -- provided the proper type is always used.
|
|
|
505
|
|
|
506 -- To deal with these two requirements we add the special checks
|
|
|
507 -- on equal sizes and use the root type to distinguish.
|
|
|
508
|
|
|
509 if P_Size <= Standard_Short_Float_Size
|
|
|
510 and then (Standard_Short_Float_Size /= Standard_Float_Size
|
|
|
511 or else Rt_Type = Standard_Short_Float)
|
|
|
512 then
|
|
|
513 Lib_RE := RE_I_SF;
|
|
|
514
|
|
|
515 elsif P_Size <= Standard_Float_Size then
|
|
|
516 Lib_RE := RE_I_F;
|
|
|
517
|
|
|
518 elsif P_Size <= Standard_Long_Float_Size
|
|
|
519 and then (Standard_Long_Float_Size /= Standard_Long_Long_Float_Size
|
|
|
520 or else Rt_Type = Standard_Long_Float)
|
|
|
521 then
|
|
|
522 Lib_RE := RE_I_LF;
|
|
|
523
|
|
|
524 else
|
|
|
525 Lib_RE := RE_I_LLF;
|
|
|
526 end if;
|
|
|
527
|
|
|
528 -- Signed integer types. Also includes signed fixed-point types and
|
|
|
529 -- enumeration types with a signed representation.
|
|
|
530
|
|
|
531 -- Note on signed integer types. We do not consider types as signed for
|
|
|
532 -- this purpose if they have no negative numbers, or if they have biased
|
|
|
533 -- representation. The reason is that the value in either case basically
|
|
|
534 -- represents an unsigned value.
|
|
|
535
|
|
|
536 -- For example, consider:
|
|
|
537
|
|
|
538 -- type W is range 0 .. 2**32 - 1;
|
|
|
539 -- for W'Size use 32;
|
|
|
540
|
|
|
541 -- This is a signed type, but the representation is unsigned, and may
|
|
|
542 -- be outside the range of a 32-bit signed integer, so this must be
|
|
|
543 -- treated as 32-bit unsigned.
|
|
|
544
|
|
|
545 -- Similarly, if we have
|
|
|
546
|
|
|
547 -- type W is range -1 .. +254;
|
|
|
548 -- for W'Size use 8;
|
|
|
549
|
|
|
550 -- then the representation is unsigned
|
|
|
551
|
|
|
552 elsif not Is_Unsigned_Type (FST)
|
|
|
553
|
|
|
554 -- The following set of tests gets repeated many times, we should
|
|
|
555 -- have an abstraction defined ???
|
|
|
556
|
|
|
557 and then
|
|
|
558 (Is_Fixed_Point_Type (U_Type)
|
|
|
559 or else
|
|
|
560 Is_Enumeration_Type (U_Type)
|
|
|
561 or else
|
|
|
562 (Is_Signed_Integer_Type (U_Type)
|
|
|
563 and then not Has_Biased_Representation (FST)))
|
|
|
564
|
|
|
565 then
|
|
|
566 if P_Size <= Standard_Short_Short_Integer_Size then
|
|
|
567 Lib_RE := RE_I_SSI;
|
|
|
568
|
|
|
569 elsif P_Size <= Standard_Short_Integer_Size then
|
|
|
570 Lib_RE := RE_I_SI;
|
|
|
571
|
|
|
572 elsif P_Size <= Standard_Integer_Size then
|
|
|
573 Lib_RE := RE_I_I;
|
|
|
574
|
|
|
575 elsif P_Size <= Standard_Long_Integer_Size then
|
|
|
576 Lib_RE := RE_I_LI;
|
|
|
577
|
|
|
578 else
|
|
|
579 Lib_RE := RE_I_LLI;
|
|
|
580 end if;
|
|
|
581
|
|
|
582 -- Unsigned integer types, also includes unsigned fixed-point types
|
|
|
583 -- and enumeration types with an unsigned representation (note that
|
|
|
584 -- we know they are unsigned because we already tested for signed).
|
|
|
585
|
|
|
586 -- Also includes signed integer types that are unsigned in the sense
|
|
|
587 -- that they do not include negative numbers. See above for details.
|
|
|
588
|
|
|
589 elsif Is_Modular_Integer_Type (U_Type)
|
|
|
590 or else Is_Fixed_Point_Type (U_Type)
|
|
|
591 or else Is_Enumeration_Type (U_Type)
|
|
|
592 or else Is_Signed_Integer_Type (U_Type)
|
|
|
593 then
|
|
|
594 if P_Size <= Standard_Short_Short_Integer_Size then
|
|
|
595 Lib_RE := RE_I_SSU;
|
|
|
596
|
|
|
597 elsif P_Size <= Standard_Short_Integer_Size then
|
|
|
598 Lib_RE := RE_I_SU;
|
|
|
599
|
|
|
600 elsif P_Size <= Standard_Integer_Size then
|
|
|
601 Lib_RE := RE_I_U;
|
|
|
602
|
|
|
603 elsif P_Size <= Standard_Long_Integer_Size then
|
|
|
604 Lib_RE := RE_I_LU;
|
|
|
605
|
|
|
606 else
|
|
|
607 Lib_RE := RE_I_LLU;
|
|
|
608 end if;
|
|
|
609
|
|
|
610 else pragma Assert (Is_Access_Type (U_Type));
|
|
|
611 if P_Size > System_Address_Size then
|
|
|
612 Lib_RE := RE_I_AD;
|
|
|
613 else
|
|
|
614 Lib_RE := RE_I_AS;
|
|
|
615 end if;
|
|
|
616 end if;
|
|
|
617
|
|
|
618 -- Call the function, and do an unchecked conversion of the result
|
|
|
619 -- to the actual type of the prefix. If the target is a discriminant,
|
|
|
620 -- and we are in the body of the default implementation of a 'Read
|
|
|
621 -- attribute, set target type to force a constraint check (13.13.2(35)).
|
|
|
622 -- If the type of the discriminant is currently private, add another
|
|
|
623 -- unchecked conversion from the full view.
|
|
|
624
|
|
|
625 if Nkind (Targ) = N_Identifier
|
|
|
626 and then Is_Internal_Name (Chars (Targ))
|
|
|
627 and then Is_TSS (Scope (Entity (Targ)), TSS_Stream_Read)
|
|
|
628 then
|
|
|
629 Res :=
|
|
|
630 Unchecked_Convert_To (Base_Type (U_Type),
|
|
|
631 Make_Function_Call (Loc,
|
|
|
632 Name => New_Occurrence_Of (RTE (Lib_RE), Loc),
|
|
|
633 Parameter_Associations => New_List (
|
|
|
634 Relocate_Node (Strm))));
|
|
|
635
|
|
|
636 Set_Do_Range_Check (Res);
|
|
|
637
|
|
|
638 if Base_Type (P_Type) /= Base_Type (U_Type) then
|
|
|
639 Res := Unchecked_Convert_To (Base_Type (P_Type), Res);
|
|
|
640 end if;
|
|
|
641
|
|
|
642 return Res;
|
|
|
643
|
|
|
644 else
|
|
|
645 Res :=
|
|
|
646 Make_Function_Call (Loc,
|
|
|
647 Name => New_Occurrence_Of (RTE (Lib_RE), Loc),
|
|
|
648 Parameter_Associations => New_List (
|
|
|
649 Relocate_Node (Strm)));
|
|
|
650
|
|
|
651 -- Now convert to the base type if we do not have a biased type. Note
|
|
|
652 -- that we did not do this in some older versions, and the result was
|
|
|
653 -- losing a required range check in the case where 'Input is being
|
|
|
654 -- called from 'Read.
|
|
|
655
|
|
|
656 if not Has_Biased_Representation (P_Type) then
|
|
|
657 return Unchecked_Convert_To (Base_Type (P_Type), Res);
|
|
|
658
|
|
|
659 -- For the biased case, the conversion to the base type loses the
|
|
|
660 -- biasing, so just convert to Ptype. This is not quite right, and
|
|
|
661 -- for example may lose a corner case CE test, but it is such a
|
|
|
662 -- rare case that for now we ignore it ???
|
|
|
663
|
|
|
664 else
|
|
|
665 return Unchecked_Convert_To (P_Type, Res);
|
|
|
666 end if;
|
|
|
667 end if;
|
|
|
668 end Build_Elementary_Input_Call;
|
|
|
669
|
|
|
670 ---------------------------------
|
|
|
671 -- Build_Elementary_Write_Call --
|
|
|
672 ---------------------------------
|
|
|
673
|
|
|
674 function Build_Elementary_Write_Call (N : Node_Id) return Node_Id is
|
|
|
675 Loc : constant Source_Ptr := Sloc (N);
|
|
|
676 P_Type : constant Entity_Id := Entity (Prefix (N));
|
|
|
677 U_Type : constant Entity_Id := Underlying_Type (P_Type);
|
|
|
678 Rt_Type : constant Entity_Id := Root_Type (U_Type);
|
|
|
679 FST : constant Entity_Id := First_Subtype (U_Type);
|
|
|
680 Strm : constant Node_Id := First (Expressions (N));
|
|
|
681 Item : constant Node_Id := Next (Strm);
|
|
|
682 P_Size : Uint;
|
|
|
683 Lib_RE : RE_Id;
|
|
|
684 Libent : Entity_Id;
|
|
|
685
|
|
|
686 begin
|
|
|
687 -- Compute the size of the stream element. This is either the size of
|
|
|
688 -- the first subtype or if given the size of the Stream_Size attribute.
|
|
|
689
|
|
|
690 if Has_Stream_Size_Clause (FST) then
|
|
|
691 P_Size := Static_Integer (Expression (Stream_Size_Clause (FST)));
|
|
|
692 else
|
|
|
693 P_Size := Esize (FST);
|
|
|
694 end if;
|
|
|
695
|
|
|
696 -- Find the routine to be called
|
|
|
697
|
|
|
698 -- Check for First Boolean and Character. These are enumeration types,
|
|
|
699 -- but we treat them specially, since they may require special handling
|
|
|
700 -- in the transfer protocol. However, this special handling only applies
|
|
|
701 -- if they have standard representation, otherwise they are treated like
|
|
|
702 -- any other enumeration type.
|
|
|
703
|
|
|
704 if Rt_Type = Standard_Boolean
|
|
|
705 and then Has_Stream_Standard_Rep (U_Type)
|
|
|
706 then
|
|
|
707 Lib_RE := RE_W_B;
|
|
|
708
|
|
|
709 elsif Rt_Type = Standard_Character
|
|
|
710 and then Has_Stream_Standard_Rep (U_Type)
|
|
|
711 then
|
|
|
712 Lib_RE := RE_W_C;
|
|
|
713
|
|
|
714 elsif Rt_Type = Standard_Wide_Character
|
|
|
715 and then Has_Stream_Standard_Rep (U_Type)
|
|
|
716 then
|
|
|
717 Lib_RE := RE_W_WC;
|
|
|
718
|
|
|
719 elsif Rt_Type = Standard_Wide_Wide_Character
|
|
|
720 and then Has_Stream_Standard_Rep (U_Type)
|
|
|
721 then
|
|
|
722 Lib_RE := RE_W_WWC;
|
|
|
723
|
|
|
724 -- Floating point types
|
|
|
725
|
|
|
726 elsif Is_Floating_Point_Type (U_Type) then
|
|
|
727
|
|
|
728 -- Question: should we use P_Size or Rt_Type to distinguish between
|
|
|
729 -- possible floating point types? If a non-standard size or a stream
|
|
|
730 -- size is specified, then we should certainly use the size. But if
|
|
|
731 -- we have two types the same (notably Short_Float_Size = Float_Size
|
|
|
732 -- which is close to universally true, and Long_Long_Float_Size =
|
|
|
733 -- Long_Float_Size, true on most targets except the x86), then we
|
|
|
734 -- would really rather use the root type, so that if people want to
|
|
|
735 -- fiddle with System.Stream_Attributes to get inter-target portable
|
|
|
736 -- streams, they get the size they expect. Consider in particular the
|
|
|
737 -- case of a stream written on an x86, with 96-bit Long_Long_Float
|
|
|
738 -- being read into a non-x86 target with 64 bit Long_Long_Float. A
|
|
|
739 -- special version of System.Stream_Attributes can deal with this
|
|
|
740 -- provided the proper type is always used.
|
|
|
741
|
|
|
742 -- To deal with these two requirements we add the special checks
|
|
|
743 -- on equal sizes and use the root type to distinguish.
|
|
|
744
|
|
|
745 if P_Size <= Standard_Short_Float_Size
|
|
|
746 and then (Standard_Short_Float_Size /= Standard_Float_Size
|
|
|
747 or else Rt_Type = Standard_Short_Float)
|
|
|
748 then
|
|
|
749 Lib_RE := RE_W_SF;
|
|
|
750
|
|
|
751 elsif P_Size <= Standard_Float_Size then
|
|
|
752 Lib_RE := RE_W_F;
|
|
|
753
|
|
|
754 elsif P_Size <= Standard_Long_Float_Size
|
|
|
755 and then (Standard_Long_Float_Size /= Standard_Long_Long_Float_Size
|
|
|
756 or else Rt_Type = Standard_Long_Float)
|
|
|
757 then
|
|
|
758 Lib_RE := RE_W_LF;
|
|
|
759
|
|
|
760 else
|
|
|
761 Lib_RE := RE_W_LLF;
|
|
|
762 end if;
|
|
|
763
|
|
|
764 -- Signed integer types. Also includes signed fixed-point types and
|
|
|
765 -- signed enumeration types share this circuitry.
|
|
|
766
|
|
|
767 -- Note on signed integer types. We do not consider types as signed for
|
|
|
768 -- this purpose if they have no negative numbers, or if they have biased
|
|
|
769 -- representation. The reason is that the value in either case basically
|
|
|
770 -- represents an unsigned value.
|
|
|
771
|
|
|
772 -- For example, consider:
|
|
|
773
|
|
|
774 -- type W is range 0 .. 2**32 - 1;
|
|
|
775 -- for W'Size use 32;
|
|
|
776
|
|
|
777 -- This is a signed type, but the representation is unsigned, and may
|
|
|
778 -- be outside the range of a 32-bit signed integer, so this must be
|
|
|
779 -- treated as 32-bit unsigned.
|
|
|
780
|
|
|
781 -- Similarly, the representation is also unsigned if we have:
|
|
|
782
|
|
|
783 -- type W is range -1 .. +254;
|
|
|
784 -- for W'Size use 8;
|
|
|
785
|
|
|
786 -- forcing a biased and unsigned representation
|
|
|
787
|
|
|
788 elsif not Is_Unsigned_Type (FST)
|
|
|
789 and then
|
|
|
790 (Is_Fixed_Point_Type (U_Type)
|
|
|
791 or else
|
|
|
792 Is_Enumeration_Type (U_Type)
|
|
|
793 or else
|
|
|
794 (Is_Signed_Integer_Type (U_Type)
|
|
|
795 and then not Has_Biased_Representation (FST)))
|
|
|
796 then
|
|
|
797 if P_Size <= Standard_Short_Short_Integer_Size then
|
|
|
798 Lib_RE := RE_W_SSI;
|
|
|
799 elsif P_Size <= Standard_Short_Integer_Size then
|
|
|
800 Lib_RE := RE_W_SI;
|
|
|
801 elsif P_Size <= Standard_Integer_Size then
|
|
|
802 Lib_RE := RE_W_I;
|
|
|
803 elsif P_Size <= Standard_Long_Integer_Size then
|
|
|
804 Lib_RE := RE_W_LI;
|
|
|
805 else
|
|
|
806 Lib_RE := RE_W_LLI;
|
|
|
807 end if;
|
|
|
808
|
|
|
809 -- Unsigned integer types, also includes unsigned fixed-point types
|
|
|
810 -- and unsigned enumeration types (note we know they are unsigned
|
|
|
811 -- because we already tested for signed above).
|
|
|
812
|
|
|
813 -- Also includes signed integer types that are unsigned in the sense
|
|
|
814 -- that they do not include negative numbers. See above for details.
|
|
|
815
|
|
|
816 elsif Is_Modular_Integer_Type (U_Type)
|
|
|
817 or else Is_Fixed_Point_Type (U_Type)
|
|
|
818 or else Is_Enumeration_Type (U_Type)
|
|
|
819 or else Is_Signed_Integer_Type (U_Type)
|
|
|
820 then
|
|
|
821 if P_Size <= Standard_Short_Short_Integer_Size then
|
|
|
822 Lib_RE := RE_W_SSU;
|
|
|
823 elsif P_Size <= Standard_Short_Integer_Size then
|
|
|
824 Lib_RE := RE_W_SU;
|
|
|
825 elsif P_Size <= Standard_Integer_Size then
|
|
|
826 Lib_RE := RE_W_U;
|
|
|
827 elsif P_Size <= Standard_Long_Integer_Size then
|
|
|
828 Lib_RE := RE_W_LU;
|
|
|
829 else
|
|
|
830 Lib_RE := RE_W_LLU;
|
|
|
831 end if;
|
|
|
832
|
|
|
833 else pragma Assert (Is_Access_Type (U_Type));
|
|
|
834
|
|
|
835 if P_Size > System_Address_Size then
|
|
|
836 Lib_RE := RE_W_AD;
|
|
|
837 else
|
|
|
838 Lib_RE := RE_W_AS;
|
|
|
839 end if;
|
|
|
840 end if;
|
|
|
841
|
|
|
842 -- Unchecked-convert parameter to the required type (i.e. the type of
|
|
|
843 -- the corresponding parameter, and call the appropriate routine.
|
|
|
844
|
|
|
845 Libent := RTE (Lib_RE);
|
|
|
846
|
|
|
847 return
|
|
|
848 Make_Procedure_Call_Statement (Loc,
|
|
|
849 Name => New_Occurrence_Of (Libent, Loc),
|
|
|
850 Parameter_Associations => New_List (
|
|
|
851 Relocate_Node (Strm),
|
|
|
852 Unchecked_Convert_To (Etype (Next_Formal (First_Formal (Libent))),
|
|
|
853 Relocate_Node (Item))));
|
|
|
854 end Build_Elementary_Write_Call;
|
|
|
855
|
|
|
856 -----------------------------------------
|
|
|
857 -- Build_Mutable_Record_Read_Procedure --
|
|
|
858 -----------------------------------------
|
|
|
859
|
|
|
860 procedure Build_Mutable_Record_Read_Procedure
|
|
|
861 (Loc : Source_Ptr;
|
|
|
862 Typ : Entity_Id;
|
|
|
863 Decl : out Node_Id;
|
|
|
864 Pnam : out Entity_Id)
|
|
|
865 is
|
|
|
866 Out_Formal : Node_Id;
|
|
|
867 -- Expression denoting the out formal parameter
|
|
|
868
|
|
|
869 Dcls : constant List_Id := New_List;
|
|
|
870 -- Declarations for the 'Read body
|
|
|
871
|
|
|
872 Stms : constant List_Id := New_List;
|
|
|
873 -- Statements for the 'Read body
|
|
|
874
|
|
|
875 Disc : Entity_Id;
|
|
|
876 -- Entity of the discriminant being processed
|
|
|
877
|
|
|
878 Tmp_For_Disc : Entity_Id;
|
|
|
879 -- Temporary object used to read the value of Disc
|
|
|
880
|
|
|
881 Tmps_For_Discs : constant List_Id := New_List;
|
|
|
882 -- List of object declarations for temporaries holding the read values
|
|
|
883 -- for the discriminants.
|
|
|
884
|
|
|
885 Cstr : constant List_Id := New_List;
|
|
|
886 -- List of constraints to be applied on temporary record
|
|
|
887
|
|
|
888 Discriminant_Checks : constant List_Id := New_List;
|
|
|
889 -- List of discriminant checks to be performed if the actual object
|
|
|
890 -- is constrained.
|
|
|
891
|
|
|
892 Tmp : constant Entity_Id := Make_Defining_Identifier (Loc, Name_V);
|
|
|
893 -- Temporary record must hide formal (assignments to components of the
|
|
|
894 -- record are always generated with V as the identifier for the record).
|
|
|
895
|
|
|
896 Constrained_Stms : List_Id := New_List;
|
|
|
897 -- Statements within the block where we have the constrained temporary
|
|
|
898
|
|
|
899 begin
|
|
|
900 -- A mutable type cannot be a tagged type, so we generate a new name
|
|
|
901 -- for the stream procedure.
|
|
|
902
|
|
|
903 Pnam :=
|
|
|
904 Make_Defining_Identifier (Loc,
|
|
|
905 Chars => Make_TSS_Name_Local (Typ, TSS_Stream_Read));
|
|
|
906
|
|
|
907 if Is_Unchecked_Union (Typ) then
|
|
|
908
|
|
|
909 -- If this is an unchecked union, the stream procedure is erroneous,
|
|
|
910 -- because there are no discriminants to read.
|
|
|
911
|
|
|
912 -- This should generate a warning ???
|
|
|
913
|
|
|
914 Append_To (Stms,
|
|
|
915 Make_Raise_Program_Error (Loc,
|
|
|
916 Reason => PE_Unchecked_Union_Restriction));
|
|
|
917
|
|
|
918 Build_Stream_Procedure (Loc, Typ, Decl, Pnam, Stms, Outp => True);
|
|
|
919 return;
|
|
|
920 end if;
|
|
|
921
|
|
|
922 Disc := First_Discriminant (Typ);
|
|
|
923
|
|
|
924 Out_Formal :=
|
|
|
925 Make_Selected_Component (Loc,
|
|
|
926 Prefix => New_Occurrence_Of (Pnam, Loc),
|
|
|
927 Selector_Name => Make_Identifier (Loc, Name_V));
|
|
|
928
|
|
|
929 -- Generate Reads for the discriminants of the type. The discriminants
|
|
|
930 -- need to be read before the rest of the components, so that variants
|
|
|
931 -- are initialized correctly. The discriminants must be read into temp
|
|
|
932 -- variables so an incomplete Read (interrupted by an exception, for
|
|
|
933 -- example) does not alter the passed object.
|
|
|
934
|
|
|
935 while Present (Disc) loop
|
|
|
936 Tmp_For_Disc := Make_Defining_Identifier (Loc,
|
|
|
937 New_External_Name (Chars (Disc), "D"));
|
|
|
938
|
|
|
939 Append_To (Tmps_For_Discs,
|
|
|
940 Make_Object_Declaration (Loc,
|
|
|
941 Defining_Identifier => Tmp_For_Disc,
|
|
|
942 Object_Definition => New_Occurrence_Of (Etype (Disc), Loc)));
|
|
|
943 Set_No_Initialization (Last (Tmps_For_Discs));
|
|
|
944
|
|
|
945 Append_To (Stms,
|
|
|
946 Make_Attribute_Reference (Loc,
|
|
|
947 Prefix => New_Occurrence_Of (Etype (Disc), Loc),
|
|
|
948 Attribute_Name => Name_Read,
|
|
|
949 Expressions => New_List (
|
|
|
950 Make_Identifier (Loc, Name_S),
|
|
|
951 New_Occurrence_Of (Tmp_For_Disc, Loc))));
|
|
|
952
|
|
|
953 Append_To (Cstr,
|
|
|
954 Make_Discriminant_Association (Loc,
|
|
|
955 Selector_Names => New_List (New_Occurrence_Of (Disc, Loc)),
|
|
|
956 Expression => New_Occurrence_Of (Tmp_For_Disc, Loc)));
|
|
|
957
|
|
|
958 Append_To (Discriminant_Checks,
|
|
|
959 Make_Raise_Constraint_Error (Loc,
|
|
|
960 Condition =>
|
|
|
961 Make_Op_Ne (Loc,
|
|
|
962 Left_Opnd => New_Occurrence_Of (Tmp_For_Disc, Loc),
|
|
|
963 Right_Opnd =>
|
|
|
964 Make_Selected_Component (Loc,
|
|
|
965 Prefix => New_Copy_Tree (Out_Formal),
|
|
|
966 Selector_Name => New_Occurrence_Of (Disc, Loc))),
|
|
|
967 Reason => CE_Discriminant_Check_Failed));
|
|
|
968 Next_Discriminant (Disc);
|
|
|
969 end loop;
|
|
|
970
|
|
|
971 -- Generate reads for the components of the record (including those
|
|
|
972 -- that depend on discriminants).
|
|
|
973
|
|
|
974 Build_Record_Read_Write_Procedure (Loc, Typ, Decl, Pnam, Name_Read);
|
|
|
975
|
|
|
976 -- Save original statement sequence for component assignments, and
|
|
|
977 -- replace it with Stms.
|
|
|
978
|
|
|
979 Constrained_Stms := Statements (Handled_Statement_Sequence (Decl));
|
|
|
980 Set_Handled_Statement_Sequence (Decl,
|
|
|
981 Make_Handled_Sequence_Of_Statements (Loc,
|
|
|
982 Statements => Stms));
|
|
|
983
|
|
|
984 -- If Typ has controlled components (i.e. if it is classwide or
|
|
|
985 -- Has_Controlled), or components constrained using the discriminants
|
|
|
986 -- of Typ, then we need to ensure that all component assignments are
|
|
|
987 -- performed on an object that has been appropriately constrained
|
|
|
988 -- prior to being initialized. To this effect, we wrap the component
|
|
|
989 -- assignments in a block where V is a constrained temporary.
|
|
|
990
|
|
|
991 Append_To (Dcls,
|
|
|
992 Make_Object_Declaration (Loc,
|
|
|
993 Defining_Identifier => Tmp,
|
|
|
994 Object_Definition =>
|
|
|
995 Make_Subtype_Indication (Loc,
|
|
|
996 Subtype_Mark => New_Occurrence_Of (Base_Type (Typ), Loc),
|
|
|
997 Constraint =>
|
|
|
998 Make_Index_Or_Discriminant_Constraint (Loc,
|
|
|
999 Constraints => Cstr))));
|
|
|
1000
|
|
|
1001 -- AI05-023-1: Insert discriminant check prior to initialization of the
|
|
|
1002 -- constrained temporary.
|
|
|
1003
|
|
|
1004 Append_To (Stms,
|
|
|
1005 Make_Implicit_If_Statement (Pnam,
|
|
|
1006 Condition =>
|
|
|
1007 Make_Attribute_Reference (Loc,
|
|
|
1008 Prefix => New_Copy_Tree (Out_Formal),
|
|
|
1009 Attribute_Name => Name_Constrained),
|
|
|
1010 Then_Statements => Discriminant_Checks));
|
|
|
1011
|
|
|
1012 -- Now insert back original component assignments, wrapped in a block
|
|
|
1013 -- in which V is the constrained temporary.
|
|
|
1014
|
|
|
1015 Append_To (Stms,
|
|
|
1016 Make_Block_Statement (Loc,
|
|
|
1017 Declarations => Dcls,
|
|
|
1018 Handled_Statement_Sequence => Parent (Constrained_Stms)));
|
|
|
1019
|
|
|
1020 Append_To (Constrained_Stms,
|
|
|
1021 Make_Assignment_Statement (Loc,
|
|
|
1022 Name => Out_Formal,
|
|
|
1023 Expression => Make_Identifier (Loc, Name_V)));
|
|
|
1024
|
|
|
1025 Set_Declarations (Decl, Tmps_For_Discs);
|
|
|
1026 end Build_Mutable_Record_Read_Procedure;
|
|
|
1027
|
|
|
1028 ------------------------------------------
|
|
|
1029 -- Build_Mutable_Record_Write_Procedure --
|
|
|
1030 ------------------------------------------
|
|
|
1031
|
|
|
1032 procedure Build_Mutable_Record_Write_Procedure
|
|
|
1033 (Loc : Source_Ptr;
|
|
|
1034 Typ : Entity_Id;
|
|
|
1035 Decl : out Node_Id;
|
|
|
1036 Pnam : out Entity_Id)
|
|
|
1037 is
|
|
|
1038 Stms : List_Id;
|
|
|
1039 Disc : Entity_Id;
|
|
|
1040 D_Ref : Node_Id;
|
|
|
1041
|
|
|
1042 begin
|
|
|
1043 Stms := New_List;
|
|
|
1044 Disc := First_Discriminant (Typ);
|
|
|
1045
|
|
|
1046 -- Generate Writes for the discriminants of the type
|
|
|
1047 -- If the type is an unchecked union, use the default values of
|
|
|
1048 -- the discriminants, because they are not stored.
|
|
|
1049
|
|
|
1050 while Present (Disc) loop
|
|
|
1051 if Is_Unchecked_Union (Typ) then
|
|
|
1052 D_Ref :=
|
|
|
1053 New_Copy_Tree (Discriminant_Default_Value (Disc));
|
|
|
1054 else
|
|
|
1055 D_Ref :=
|
|
|
1056 Make_Selected_Component (Loc,
|
|
|
1057 Prefix => Make_Identifier (Loc, Name_V),
|
|
|
1058 Selector_Name => New_Occurrence_Of (Disc, Loc));
|
|
|
1059 end if;
|
|
|
1060
|
|
|
1061 Append_To (Stms,
|
|
|
1062 Make_Attribute_Reference (Loc,
|
|
|
1063 Prefix => New_Occurrence_Of (Etype (Disc), Loc),
|
|
|
1064 Attribute_Name => Name_Write,
|
|
|
1065 Expressions => New_List (
|
|
|
1066 Make_Identifier (Loc, Name_S),
|
|
|
1067 D_Ref)));
|
|
|
1068
|
|
|
1069 Next_Discriminant (Disc);
|
|
|
1070 end loop;
|
|
|
1071
|
|
|
1072 -- A mutable type cannot be a tagged type, so we generate a new name
|
|
|
1073 -- for the stream procedure.
|
|
|
1074
|
|
|
1075 Pnam :=
|
|
|
1076 Make_Defining_Identifier (Loc,
|
|
|
1077 Chars => Make_TSS_Name_Local (Typ, TSS_Stream_Write));
|
|
|
1078 Build_Record_Read_Write_Procedure (Loc, Typ, Decl, Pnam, Name_Write);
|
|
|
1079
|
|
|
1080 -- Write the discriminants before the rest of the components, so
|
|
|
1081 -- that discriminant values are properly set of variants, etc.
|
|
|
1082
|
|
|
1083 if Is_Non_Empty_List (
|
|
|
1084 Statements (Handled_Statement_Sequence (Decl)))
|
|
|
1085 then
|
|
|
1086 Insert_List_Before
|
|
|
1087 (First (Statements (Handled_Statement_Sequence (Decl))), Stms);
|
|
|
1088 else
|
|
|
1089 Set_Statements (Handled_Statement_Sequence (Decl), Stms);
|
|
|
1090 end if;
|
|
|
1091 end Build_Mutable_Record_Write_Procedure;
|
|
|
1092
|
|
|
1093 -----------------------------------------------
|
|
|
1094 -- Build_Record_Or_Elementary_Input_Function --
|
|
|
1095 -----------------------------------------------
|
|
|
1096
|
|
|
1097 -- The function we build looks like
|
|
|
1098
|
|
|
1099 -- function InputN (S : access RST) return Typ is
|
|
|
1100 -- C1 : constant Disc_Type_1;
|
|
|
1101 -- Discr_Type_1'Read (S, C1);
|
|
|
1102 -- C2 : constant Disc_Type_2;
|
|
|
1103 -- Discr_Type_2'Read (S, C2);
|
|
|
1104 -- ...
|
|
|
1105 -- Cn : constant Disc_Type_n;
|
|
|
1106 -- Discr_Type_n'Read (S, Cn);
|
|
|
1107 -- V : Typ (C1, C2, .. Cn)
|
|
|
1108
|
|
|
1109 -- begin
|
|
|
1110 -- Typ'Read (S, V);
|
|
|
1111 -- return V;
|
|
|
1112 -- end InputN
|
|
|
1113
|
|
|
1114 -- The discriminants are of course only present in the case of a record
|
|
|
1115 -- with discriminants. In the case of a record with no discriminants, or
|
|
|
1116 -- an elementary type, then no Cn constants are defined.
|
|
|
1117
|
|
|
1118 procedure Build_Record_Or_Elementary_Input_Function
|
|
|
1119 (Loc : Source_Ptr;
|
|
|
1120 Typ : Entity_Id;
|
|
|
1121 Decl : out Node_Id;
|
|
|
1122 Fnam : out Entity_Id;
|
|
|
1123 Use_Underlying : Boolean := True)
|
|
|
1124 is
|
|
|
1125 B_Typ : Entity_Id := Base_Type (Typ);
|
|
|
1126 Cn : Name_Id;
|
|
|
1127 Constr : List_Id;
|
|
|
1128 Decls : List_Id;
|
|
|
1129 Discr : Entity_Id;
|
|
|
1130 Discr_Elmt : Elmt_Id := No_Elmt;
|
|
|
1131 J : Pos;
|
|
|
1132 Obj_Decl : Node_Id;
|
|
|
1133 Odef : Node_Id;
|
|
|
1134 Stms : List_Id;
|
|
|
1135
|
|
|
1136 begin
|
|
|
1137 if Use_Underlying then
|
|
|
1138 B_Typ := Underlying_Type (B_Typ);
|
|
|
1139 end if;
|
|
|
1140
|
|
|
1141 Decls := New_List;
|
|
|
1142 Constr := New_List;
|
|
|
1143
|
|
|
1144 J := 1;
|
|
|
1145
|
|
|
1146 -- In the presence of multiple instantiations (as in uses of the Booch
|
|
|
1147 -- components) the base type may be private, and the underlying type
|
|
|
1148 -- already constrained, in which case there's no discriminant constraint
|
|
|
1149 -- to construct.
|
|
|
1150
|
|
|
1151 if Has_Discriminants (Typ)
|
|
|
1152 and then No (Discriminant_Default_Value (First_Discriminant (Typ)))
|
|
|
1153 and then not Is_Constrained (Underlying_Type (B_Typ))
|
|
|
1154 then
|
|
|
1155 Discr := First_Discriminant (B_Typ);
|
|
|
1156
|
|
|
1157 -- If the prefix subtype is constrained, then retrieve the first
|
|
|
1158 -- element of its constraint.
|
|
|
1159
|
|
|
1160 if Is_Constrained (Typ) then
|
|
|
1161 Discr_Elmt := First_Elmt (Discriminant_Constraint (Typ));
|
|
|
1162 end if;
|
|
|
1163
|
|
|
1164 while Present (Discr) loop
|
|
|
1165 Cn := New_External_Name ('C', J);
|
|
|
1166
|
|
|
1167 Decl :=
|
|
|
1168 Make_Object_Declaration (Loc,
|
|
|
1169 Defining_Identifier => Make_Defining_Identifier (Loc, Cn),
|
|
|
1170 Object_Definition =>
|
|
|
1171 New_Occurrence_Of (Etype (Discr), Loc));
|
|
|
1172
|
|
|
1173 -- If this is an access discriminant, do not perform default
|
|
|
1174 -- initialization. The discriminant is about to get its value
|
|
|
1175 -- from Read, and if the type is null excluding we do not want
|
|
|
1176 -- spurious warnings on an initial null value.
|
|
|
1177
|
|
|
1178 if Is_Access_Type (Etype (Discr)) then
|
|
|
1179 Set_No_Initialization (Decl);
|
|
|
1180 end if;
|
|
|
1181
|
|
|
1182 Append_To (Decls, Decl);
|
|
|
1183 Append_To (Decls,
|
|
|
1184 Make_Attribute_Reference (Loc,
|
|
|
1185 Prefix => New_Occurrence_Of (Etype (Discr), Loc),
|
|
|
1186 Attribute_Name => Name_Read,
|
|
|
1187 Expressions => New_List (
|
|
|
1188 Make_Identifier (Loc, Name_S),
|
|
|
1189 Make_Identifier (Loc, Cn))));
|
|
|
1190
|
|
|
1191 Append_To (Constr, Make_Identifier (Loc, Cn));
|
|
|
1192
|
|
|
1193 -- If the prefix subtype imposes a discriminant constraint, then
|
|
|
1194 -- check that each discriminant value equals the value read.
|
|
|
1195
|
|
|
1196 if Present (Discr_Elmt) then
|
|
|
1197 Append_To (Decls,
|
|
|
1198 Make_Raise_Constraint_Error (Loc,
|
|
|
1199 Condition => Make_Op_Ne (Loc,
|
|
|
1200 Left_Opnd =>
|
|
|
1201 New_Occurrence_Of
|
|
|
1202 (Defining_Identifier (Decl), Loc),
|
|
|
1203 Right_Opnd =>
|
|
|
1204 New_Copy_Tree (Node (Discr_Elmt))),
|
|
|
1205 Reason => CE_Discriminant_Check_Failed));
|
|
|
1206
|
|
|
1207 Next_Elmt (Discr_Elmt);
|
|
|
1208 end if;
|
|
|
1209
|
|
|
1210 Next_Discriminant (Discr);
|
|
|
1211 J := J + 1;
|
|
|
1212 end loop;
|
|
|
1213
|
|
|
1214 Odef :=
|
|
|
1215 Make_Subtype_Indication (Loc,
|
|
|
1216 Subtype_Mark => New_Occurrence_Of (B_Typ, Loc),
|
|
|
1217 Constraint =>
|
|
|
1218 Make_Index_Or_Discriminant_Constraint (Loc,
|
|
|
1219 Constraints => Constr));
|
|
|
1220
|
|
|
1221 -- If no discriminants, then just use the type with no constraint
|
|
|
1222
|
|
|
1223 else
|
|
|
1224 Odef := New_Occurrence_Of (B_Typ, Loc);
|
|
|
1225 end if;
|
|
|
1226
|
|
|
1227 -- Create an extended return statement encapsulating the result object
|
|
|
1228 -- and 'Read call, which is needed in general for proper handling of
|
|
|
1229 -- build-in-place results (such as when the result type is inherently
|
|
|
1230 -- limited).
|
|
|
1231
|
|
|
1232 Obj_Decl :=
|
|
|
1233 Make_Object_Declaration (Loc,
|
|
|
1234 Defining_Identifier => Make_Defining_Identifier (Loc, Name_V),
|
|
|
1235 Object_Definition => Odef);
|
|
|
1236
|
|
|
1237 -- If the type is an access type, do not perform default initialization.
|
|
|
1238 -- The object is about to get its value from Read, and if the type is
|
|
|
1239 -- null excluding we do not want spurious warnings on an initial null.
|
|
|
1240
|
|
|
1241 if Is_Access_Type (B_Typ) then
|
|
|
1242 Set_No_Initialization (Obj_Decl);
|
|
|
1243 end if;
|
|
|
1244
|
|
|
1245 Stms := New_List (
|
|
|
1246 Make_Extended_Return_Statement (Loc,
|
|
|
1247 Return_Object_Declarations => New_List (Obj_Decl),
|
|
|
1248 Handled_Statement_Sequence =>
|
|
|
1249 Make_Handled_Sequence_Of_Statements (Loc,
|
|
|
1250 Statements => New_List (
|
|
|
1251 Make_Attribute_Reference (Loc,
|
|
|
1252 Prefix => New_Occurrence_Of (B_Typ, Loc),
|
|
|
1253 Attribute_Name => Name_Read,
|
|
|
1254 Expressions => New_List (
|
|
|
1255 Make_Identifier (Loc, Name_S),
|
|
|
1256 Make_Identifier (Loc, Name_V)))))));
|
|
|
1257
|
|
|
1258 Fnam := Make_Stream_Subprogram_Name (Loc, B_Typ, TSS_Stream_Input);
|
|
|
1259
|
|
|
1260 Build_Stream_Function (Loc, B_Typ, Decl, Fnam, Decls, Stms);
|
|
|
1261 end Build_Record_Or_Elementary_Input_Function;
|
|
|
1262
|
|
|
1263 -------------------------------------------------
|
|
|
1264 -- Build_Record_Or_Elementary_Output_Procedure --
|
|
|
1265 -------------------------------------------------
|
|
|
1266
|
|
|
1267 procedure Build_Record_Or_Elementary_Output_Procedure
|
|
|
1268 (Loc : Source_Ptr;
|
|
|
1269 Typ : Entity_Id;
|
|
|
1270 Decl : out Node_Id;
|
|
|
1271 Pnam : out Entity_Id)
|
|
|
1272 is
|
|
|
1273 Stms : List_Id;
|
|
|
1274 Disc : Entity_Id;
|
|
|
1275 Disc_Ref : Node_Id;
|
|
|
1276
|
|
|
1277 begin
|
|
|
1278 Stms := New_List;
|
|
|
1279
|
|
|
1280 -- Note that of course there will be no discriminants for the elementary
|
|
|
1281 -- type case, so Has_Discriminants will be False. Note that the language
|
|
|
1282 -- rules do not allow writing the discriminants in the defaulted case,
|
|
|
1283 -- because those are written by 'Write.
|
|
|
1284
|
|
|
1285 if Has_Discriminants (Typ)
|
|
|
1286 and then No (Discriminant_Default_Value (First_Discriminant (Typ)))
|
|
|
1287 then
|
|
|
1288 Disc := First_Discriminant (Typ);
|
|
|
1289 while Present (Disc) loop
|
|
|
1290
|
|
|
1291 -- If the type is an unchecked union, it must have default
|
|
|
1292 -- discriminants (this is checked earlier), and those defaults
|
|
|
1293 -- are written out to the stream.
|
|
|
1294
|
|
|
1295 if Is_Unchecked_Union (Typ) then
|
|
|
1296 Disc_Ref := New_Copy_Tree (Discriminant_Default_Value (Disc));
|
|
|
1297
|
|
|
1298 else
|
|
|
1299 Disc_Ref :=
|
|
|
1300 Make_Selected_Component (Loc,
|
|
|
1301 Prefix => Make_Identifier (Loc, Name_V),
|
|
|
1302 Selector_Name => New_Occurrence_Of (Disc, Loc));
|
|
|
1303 end if;
|
|
|
1304
|
|
|
1305 Append_To (Stms,
|
|
|
1306 Make_Attribute_Reference (Loc,
|
|
|
1307 Prefix =>
|
|
|
1308 New_Occurrence_Of (Stream_Base_Type (Etype (Disc)), Loc),
|
|
|
1309 Attribute_Name => Name_Write,
|
|
|
1310 Expressions => New_List (
|
|
|
1311 Make_Identifier (Loc, Name_S),
|
|
|
1312 Disc_Ref)));
|
|
|
1313
|
|
|
1314 Next_Discriminant (Disc);
|
|
|
1315 end loop;
|
|
|
1316 end if;
|
|
|
1317
|
|
|
1318 Append_To (Stms,
|
|
|
1319 Make_Attribute_Reference (Loc,
|
|
|
1320 Prefix => New_Occurrence_Of (Typ, Loc),
|
|
|
1321 Attribute_Name => Name_Write,
|
|
|
1322 Expressions => New_List (
|
|
|
1323 Make_Identifier (Loc, Name_S),
|
|
|
1324 Make_Identifier (Loc, Name_V))));
|
|
|
1325
|
|
|
1326 Pnam := Make_Stream_Subprogram_Name (Loc, Typ, TSS_Stream_Output);
|
|
|
1327
|
|
|
1328 Build_Stream_Procedure (Loc, Typ, Decl, Pnam, Stms, False);
|
|
|
1329 end Build_Record_Or_Elementary_Output_Procedure;
|
|
|
1330
|
|
|
1331 ---------------------------------
|
|
|
1332 -- Build_Record_Read_Procedure --
|
|
|
1333 ---------------------------------
|
|
|
1334
|
|
|
1335 procedure Build_Record_Read_Procedure
|
|
|
1336 (Loc : Source_Ptr;
|
|
|
1337 Typ : Entity_Id;
|
|
|
1338 Decl : out Node_Id;
|
|
|
1339 Pnam : out Entity_Id)
|
|
|
1340 is
|
|
|
1341 begin
|
|
|
1342 Pnam := Make_Stream_Subprogram_Name (Loc, Typ, TSS_Stream_Read);
|
|
|
1343 Build_Record_Read_Write_Procedure (Loc, Typ, Decl, Pnam, Name_Read);
|
|
|
1344 end Build_Record_Read_Procedure;
|
|
|
1345
|
|
|
1346 ---------------------------------------
|
|
|
1347 -- Build_Record_Read_Write_Procedure --
|
|
|
1348 ---------------------------------------
|
|
|
1349
|
|
|
1350 -- The form of the record read/write procedure is as shown by the
|
|
|
1351 -- following example for a case with one discriminant case variant:
|
|
|
1352
|
|
|
1353 -- procedure pnam (S : access RST, V : [out] Typ) is
|
|
|
1354 -- begin
|
|
|
1355 -- Component_Type'Read/Write (S, V.component);
|
|
|
1356 -- Component_Type'Read/Write (S, V.component);
|
|
|
1357 -- ...
|
|
|
1358 -- Component_Type'Read/Write (S, V.component);
|
|
|
1359 --
|
|
|
1360 -- case V.discriminant is
|
|
|
1361 -- when choices =>
|
|
|
1362 -- Component_Type'Read/Write (S, V.component);
|
|
|
1363 -- Component_Type'Read/Write (S, V.component);
|
|
|
1364 -- ...
|
|
|
1365 -- Component_Type'Read/Write (S, V.component);
|
|
|
1366 --
|
|
|
1367 -- when choices =>
|
|
|
1368 -- Component_Type'Read/Write (S, V.component);
|
|
|
1369 -- Component_Type'Read/Write (S, V.component);
|
|
|
1370 -- ...
|
|
|
1371 -- Component_Type'Read/Write (S, V.component);
|
|
|
1372 -- ...
|
|
|
1373 -- end case;
|
|
|
1374 -- end pnam;
|
|
|
1375
|
|
|
1376 -- The out keyword for V is supplied in the Read case
|
|
|
1377
|
|
|
1378 procedure Build_Record_Read_Write_Procedure
|
|
|
1379 (Loc : Source_Ptr;
|
|
|
1380 Typ : Entity_Id;
|
|
|
1381 Decl : out Node_Id;
|
|
|
1382 Pnam : Entity_Id;
|
|
|
1383 Nam : Name_Id)
|
|
|
1384 is
|
|
|
1385 Rdef : Node_Id;
|
|
|
1386 Stms : List_Id;
|
|
|
1387 Typt : Entity_Id;
|
|
|
1388
|
|
|
1389 In_Limited_Extension : Boolean := False;
|
|
|
1390 -- Set to True while processing the record extension definition
|
|
|
1391 -- for an extension of a limited type (for which an ancestor type
|
|
|
1392 -- has an explicit Nam attribute definition).
|
|
|
1393
|
|
|
1394 function Make_Component_List_Attributes (CL : Node_Id) return List_Id;
|
|
|
1395 -- Returns a sequence of attributes to process the components that
|
|
|
1396 -- are referenced in the given component list.
|
|
|
1397
|
|
|
1398 function Make_Field_Attribute (C : Entity_Id) return Node_Id;
|
|
|
1399 -- Given C, the entity for a discriminant or component, build
|
|
|
1400 -- an attribute for the corresponding field values.
|
|
|
1401
|
|
|
1402 function Make_Field_Attributes (Clist : List_Id) return List_Id;
|
|
|
1403 -- Given Clist, a component items list, construct series of attributes
|
|
|
1404 -- for fieldwise processing of the corresponding components.
|
|
|
1405
|
|
|
1406 ------------------------------------
|
|
|
1407 -- Make_Component_List_Attributes --
|
|
|
1408 ------------------------------------
|
|
|
1409
|
|
|
1410 function Make_Component_List_Attributes (CL : Node_Id) return List_Id is
|
|
|
1411 CI : constant List_Id := Component_Items (CL);
|
|
|
1412 VP : constant Node_Id := Variant_Part (CL);
|
|
|
1413
|
|
|
1414 Result : List_Id;
|
|
|
1415 Alts : List_Id;
|
|
|
1416 V : Node_Id;
|
|
|
1417 DC : Node_Id;
|
|
|
1418 DCH : List_Id;
|
|
|
1419 D_Ref : Node_Id;
|
|
|
1420
|
|
|
1421 begin
|
|
|
1422 Result := Make_Field_Attributes (CI);
|
|
|
1423
|
|
|
1424 if Present (VP) then
|
|
|
1425 Alts := New_List;
|
|
|
1426
|
|
|
1427 V := First_Non_Pragma (Variants (VP));
|
|
|
1428 while Present (V) loop
|
|
|
1429 DCH := New_List;
|
|
|
1430
|
|
|
1431 DC := First (Discrete_Choices (V));
|
|
|
1432 while Present (DC) loop
|
|
|
1433 Append_To (DCH, New_Copy_Tree (DC));
|
|
|
1434 Next (DC);
|
|
|
1435 end loop;
|
|
|
1436
|
|
|
1437 Append_To (Alts,
|
|
|
1438 Make_Case_Statement_Alternative (Loc,
|
|
|
1439 Discrete_Choices => DCH,
|
|
|
1440 Statements =>
|
|
|
1441 Make_Component_List_Attributes (Component_List (V))));
|
|
|
1442 Next_Non_Pragma (V);
|
|
|
1443 end loop;
|
|
|
1444
|
|
|
1445 -- Note: in the following, we make sure that we use new occurrence
|
|
|
1446 -- of for the selector, since there are cases in which we make a
|
|
|
1447 -- reference to a hidden discriminant that is not visible.
|
|
|
1448
|
|
|
1449 -- If the enclosing record is an unchecked_union, we use the
|
|
|
1450 -- default expressions for the discriminant (it must exist)
|
|
|
1451 -- because we cannot generate a reference to it, given that
|
|
|
1452 -- it is not stored.
|
|
|
1453
|
|
|
1454 if Is_Unchecked_Union (Scope (Entity (Name (VP)))) then
|
|
|
1455 D_Ref :=
|
|
|
1456 New_Copy_Tree
|
|
|
1457 (Discriminant_Default_Value (Entity (Name (VP))));
|
|
|
1458 else
|
|
|
1459 D_Ref :=
|
|
|
1460 Make_Selected_Component (Loc,
|
|
|
1461 Prefix => Make_Identifier (Loc, Name_V),
|
|
|
1462 Selector_Name =>
|
|
|
1463 New_Occurrence_Of (Entity (Name (VP)), Loc));
|
|
|
1464 end if;
|
|
|
1465
|
|
|
1466 Append_To (Result,
|
|
|
1467 Make_Case_Statement (Loc,
|
|
|
1468 Expression => D_Ref,
|
|
|
1469 Alternatives => Alts));
|
|
|
1470 end if;
|
|
|
1471
|
|
|
1472 return Result;
|
|
|
1473 end Make_Component_List_Attributes;
|
|
|
1474
|
|
|
1475 --------------------------
|
|
|
1476 -- Make_Field_Attribute --
|
|
|
1477 --------------------------
|
|
|
1478
|
|
|
1479 function Make_Field_Attribute (C : Entity_Id) return Node_Id is
|
|
|
1480 Field_Typ : constant Entity_Id := Stream_Base_Type (Etype (C));
|
|
|
1481
|
|
|
1482 TSS_Names : constant array (Name_Input .. Name_Write) of
|
|
|
1483 TSS_Name_Type :=
|
|
|
1484 (Name_Read => TSS_Stream_Read,
|
|
|
1485 Name_Write => TSS_Stream_Write,
|
|
|
1486 Name_Input => TSS_Stream_Input,
|
|
|
1487 Name_Output => TSS_Stream_Output,
|
|
|
1488 others => TSS_Null);
|
|
|
1489 pragma Assert (TSS_Names (Nam) /= TSS_Null);
|
|
|
1490
|
|
|
1491 begin
|
|
|
1492 if In_Limited_Extension
|
|
|
1493 and then Is_Limited_Type (Field_Typ)
|
|
|
1494 and then No (Find_Inherited_TSS (Field_Typ, TSS_Names (Nam)))
|
|
|
1495 then
|
|
|
1496 -- The declaration is illegal per 13.13.2(9/1), and this is
|
|
|
1497 -- enforced in Exp_Ch3.Check_Stream_Attributes. Keep the caller
|
|
|
1498 -- happy by returning a null statement.
|
|
|
1499
|
|
|
1500 return Make_Null_Statement (Loc);
|
|
|
1501 end if;
|
|
|
1502
|
|
|
1503 return
|
|
|
1504 Make_Attribute_Reference (Loc,
|
|
|
1505 Prefix => New_Occurrence_Of (Field_Typ, Loc),
|
|
|
1506 Attribute_Name => Nam,
|
|
|
1507 Expressions => New_List (
|
|
|
1508 Make_Identifier (Loc, Name_S),
|
|
|
1509 Make_Selected_Component (Loc,
|
|
|
1510 Prefix => Make_Identifier (Loc, Name_V),
|
|
|
1511 Selector_Name => New_Occurrence_Of (C, Loc))));
|
|
|
1512 end Make_Field_Attribute;
|
|
|
1513
|
|
|
1514 ---------------------------
|
|
|
1515 -- Make_Field_Attributes --
|
|
|
1516 ---------------------------
|
|
|
1517
|
|
|
1518 function Make_Field_Attributes (Clist : List_Id) return List_Id is
|
|
|
1519 Item : Node_Id;
|
|
|
1520 Result : List_Id;
|
|
|
1521
|
|
|
1522 begin
|
|
|
1523 Result := New_List;
|
|
|
1524
|
|
|
1525 if Present (Clist) then
|
|
|
1526 Item := First (Clist);
|
|
|
1527
|
|
|
1528 -- Loop through components, skipping all internal components,
|
|
|
1529 -- which are not part of the value (e.g. _Tag), except that we
|
|
|
1530 -- don't skip the _Parent, since we do want to process that
|
|
|
1531 -- recursively. If _Parent is an interface type, being abstract
|
|
|
1532 -- with no components there is no need to handle it.
|
|
|
1533
|
|
|
1534 while Present (Item) loop
|
|
|
1535 if Nkind (Item) = N_Component_Declaration
|
|
|
1536 and then
|
|
|
1537 ((Chars (Defining_Identifier (Item)) = Name_uParent
|
|
|
1538 and then not Is_Interface
|
|
|
1539 (Etype (Defining_Identifier (Item))))
|
|
|
1540 or else
|
|
|
1541 not Is_Internal_Name (Chars (Defining_Identifier (Item))))
|
|
|
1542 then
|
|
|
1543 Append_To
|
|
|
1544 (Result,
|
|
|
1545 Make_Field_Attribute (Defining_Identifier (Item)));
|
|
|
1546 end if;
|
|
|
1547
|
|
|
1548 Next (Item);
|
|
|
1549 end loop;
|
|
|
1550 end if;
|
|
|
1551
|
|
|
1552 return Result;
|
|
|
1553 end Make_Field_Attributes;
|
|
|
1554
|
|
|
1555 -- Start of processing for Build_Record_Read_Write_Procedure
|
|
|
1556
|
|
|
1557 begin
|
|
|
1558 -- For the protected type case, use corresponding record
|
|
|
1559
|
|
|
1560 if Is_Protected_Type (Typ) then
|
|
|
1561 Typt := Corresponding_Record_Type (Typ);
|
|
|
1562 else
|
|
|
1563 Typt := Typ;
|
|
|
1564 end if;
|
|
|
1565
|
|
|
1566 -- Note that we do nothing with the discriminants, since Read and
|
|
|
1567 -- Write do not read or write the discriminant values. All handling
|
|
|
1568 -- of discriminants occurs in the Input and Output subprograms.
|
|
|
1569
|
|
|
1570 Rdef := Type_Definition
|
|
|
1571 (Declaration_Node (Base_Type (Underlying_Type (Typt))));
|
|
|
1572 Stms := Empty_List;
|
|
|
1573
|
|
|
1574 -- In record extension case, the fields we want, including the _Parent
|
|
|
1575 -- field representing the parent type, are to be found in the extension.
|
|
|
1576 -- Note that we will naturally process the _Parent field using the type
|
|
|
1577 -- of the parent, and hence its stream attributes, which is appropriate.
|
|
|
1578
|
|
|
1579 if Nkind (Rdef) = N_Derived_Type_Definition then
|
|
|
1580 Rdef := Record_Extension_Part (Rdef);
|
|
|
1581
|
|
|
1582 if Is_Limited_Type (Typt) then
|
|
|
1583 In_Limited_Extension := True;
|
|
|
1584 end if;
|
|
|
1585 end if;
|
|
|
1586
|
|
|
1587 if Present (Component_List (Rdef)) then
|
|
|
1588 Append_List_To (Stms,
|
|
|
1589 Make_Component_List_Attributes (Component_List (Rdef)));
|
|
|
1590 end if;
|
|
|
1591
|
|
|
1592 Build_Stream_Procedure
|
|
|
1593 (Loc, Typ, Decl, Pnam, Stms, Nam = Name_Read);
|
|
|
1594 end Build_Record_Read_Write_Procedure;
|
|
|
1595
|
|
|
1596 ----------------------------------
|
|
|
1597 -- Build_Record_Write_Procedure --
|
|
|
1598 ----------------------------------
|
|
|
1599
|
|
|
1600 procedure Build_Record_Write_Procedure
|
|
|
1601 (Loc : Source_Ptr;
|
|
|
1602 Typ : Entity_Id;
|
|
|
1603 Decl : out Node_Id;
|
|
|
1604 Pnam : out Entity_Id)
|
|
|
1605 is
|
|
|
1606 begin
|
|
|
1607 Pnam := Make_Stream_Subprogram_Name (Loc, Typ, TSS_Stream_Write);
|
|
|
1608 Build_Record_Read_Write_Procedure (Loc, Typ, Decl, Pnam, Name_Write);
|
|
|
1609 end Build_Record_Write_Procedure;
|
|
|
1610
|
|
|
1611 -------------------------------
|
|
|
1612 -- Build_Stream_Attr_Profile --
|
|
|
1613 -------------------------------
|
|
|
1614
|
|
|
1615 function Build_Stream_Attr_Profile
|
|
|
1616 (Loc : Source_Ptr;
|
|
|
1617 Typ : Entity_Id;
|
|
|
1618 Nam : TSS_Name_Type) return List_Id
|
|
|
1619 is
|
|
|
1620 Profile : List_Id;
|
|
|
1621
|
|
|
1622 begin
|
|
|
1623 -- (Ada 2005: AI-441): Set the null-excluding attribute because it has
|
|
|
1624 -- no semantic meaning in Ada 95 but it is a requirement in Ada 2005.
|
|
|
1625
|
|
|
1626 Profile := New_List (
|
|
|
1627 Make_Parameter_Specification (Loc,
|
|
|
1628 Defining_Identifier => Make_Defining_Identifier (Loc, Name_S),
|
|
|
1629 Parameter_Type =>
|
|
|
1630 Make_Access_Definition (Loc,
|
|
|
1631 Null_Exclusion_Present => True,
|
|
|
1632 Subtype_Mark => New_Occurrence_Of (
|
|
|
1633 Class_Wide_Type (RTE (RE_Root_Stream_Type)), Loc))));
|
|
|
1634
|
|
|
1635 if Nam /= TSS_Stream_Input then
|
|
|
1636 Append_To (Profile,
|
|
|
1637 Make_Parameter_Specification (Loc,
|
|
|
1638 Defining_Identifier => Make_Defining_Identifier (Loc, Name_V),
|
|
|
1639 Out_Present => (Nam = TSS_Stream_Read),
|
|
|
1640 Parameter_Type => New_Occurrence_Of (Typ, Loc)));
|
|
|
1641 end if;
|
|
|
1642
|
|
|
1643 return Profile;
|
|
|
1644 end Build_Stream_Attr_Profile;
|
|
|
1645
|
|
|
1646 ---------------------------
|
|
|
1647 -- Build_Stream_Function --
|
|
|
1648 ---------------------------
|
|
|
1649
|
|
|
1650 procedure Build_Stream_Function
|
|
|
1651 (Loc : Source_Ptr;
|
|
|
1652 Typ : Entity_Id;
|
|
|
1653 Decl : out Node_Id;
|
|
|
1654 Fnam : Entity_Id;
|
|
|
1655 Decls : List_Id;
|
|
|
1656 Stms : List_Id)
|
|
|
1657 is
|
|
|
1658 Spec : Node_Id;
|
|
|
1659
|
|
|
1660 begin
|
|
|
1661 -- Construct function specification
|
|
|
1662
|
|
|
1663 -- (Ada 2005: AI-441): Set the null-excluding attribute because it has
|
|
|
1664 -- no semantic meaning in Ada 95 but it is a requirement in Ada 2005.
|
|
|
1665
|
|
|
1666 Spec :=
|
|
|
1667 Make_Function_Specification (Loc,
|
|
|
1668 Defining_Unit_Name => Fnam,
|
|
|
1669
|
|
|
1670 Parameter_Specifications => New_List (
|
|
|
1671 Make_Parameter_Specification (Loc,
|
|
|
1672 Defining_Identifier => Make_Defining_Identifier (Loc, Name_S),
|
|
|
1673 Parameter_Type =>
|
|
|
1674 Make_Access_Definition (Loc,
|
|
|
1675 Null_Exclusion_Present => True,
|
|
|
1676 Subtype_Mark =>
|
|
|
1677 New_Occurrence_Of
|
|
|
1678 (Class_Wide_Type (RTE (RE_Root_Stream_Type)), Loc)))),
|
|
|
1679
|
|
|
1680 Result_Definition => New_Occurrence_Of (Typ, Loc));
|
|
|
1681
|
|
|
1682 Decl :=
|
|
|
1683 Make_Subprogram_Body (Loc,
|
|
|
1684 Specification => Spec,
|
|
|
1685 Declarations => Decls,
|
|
|
1686 Handled_Statement_Sequence =>
|
|
|
1687 Make_Handled_Sequence_Of_Statements (Loc,
|
|
|
1688 Statements => Stms));
|
|
|
1689 end Build_Stream_Function;
|
|
|
1690
|
|
|
1691 ----------------------------
|
|
|
1692 -- Build_Stream_Procedure --
|
|
|
1693 ----------------------------
|
|
|
1694
|
|
|
1695 procedure Build_Stream_Procedure
|
|
|
1696 (Loc : Source_Ptr;
|
|
|
1697 Typ : Entity_Id;
|
|
|
1698 Decl : out Node_Id;
|
|
|
1699 Pnam : Entity_Id;
|
|
|
1700 Stms : List_Id;
|
|
|
1701 Outp : Boolean)
|
|
|
1702 is
|
|
|
1703 Spec : Node_Id;
|
|
|
1704
|
|
|
1705 begin
|
|
|
1706 -- Construct procedure specification
|
|
|
1707
|
|
|
1708 -- (Ada 2005: AI-441): Set the null-excluding attribute because it has
|
|
|
1709 -- no semantic meaning in Ada 95 but it is a requirement in Ada 2005.
|
|
|
1710
|
|
|
1711 Spec :=
|
|
|
1712 Make_Procedure_Specification (Loc,
|
|
|
1713 Defining_Unit_Name => Pnam,
|
|
|
1714
|
|
|
1715 Parameter_Specifications => New_List (
|
|
|
1716 Make_Parameter_Specification (Loc,
|
|
|
1717 Defining_Identifier => Make_Defining_Identifier (Loc, Name_S),
|
|
|
1718 Parameter_Type =>
|
|
|
1719 Make_Access_Definition (Loc,
|
|
|
1720 Null_Exclusion_Present => True,
|
|
|
1721 Subtype_Mark =>
|
|
|
1722 New_Occurrence_Of
|
|
|
1723 (Class_Wide_Type (RTE (RE_Root_Stream_Type)), Loc))),
|
|
|
1724
|
|
|
1725 Make_Parameter_Specification (Loc,
|
|
|
1726 Defining_Identifier => Make_Defining_Identifier (Loc, Name_V),
|
|
|
1727 Out_Present => Outp,
|
|
|
1728 Parameter_Type => New_Occurrence_Of (Typ, Loc))));
|
|
|
1729
|
|
|
1730 Decl :=
|
|
|
1731 Make_Subprogram_Body (Loc,
|
|
|
1732 Specification => Spec,
|
|
|
1733 Declarations => Empty_List,
|
|
|
1734 Handled_Statement_Sequence =>
|
|
|
1735 Make_Handled_Sequence_Of_Statements (Loc,
|
|
|
1736 Statements => Stms));
|
|
|
1737 end Build_Stream_Procedure;
|
|
|
1738
|
|
|
1739 -----------------------------
|
|
|
1740 -- Has_Stream_Standard_Rep --
|
|
|
1741 -----------------------------
|
|
|
1742
|
|
|
1743 function Has_Stream_Standard_Rep (U_Type : Entity_Id) return Boolean is
|
|
|
1744 Siz : Uint;
|
|
|
1745
|
|
|
1746 begin
|
|
|
1747 if Has_Non_Standard_Rep (U_Type) then
|
|
|
1748 return False;
|
|
|
1749 end if;
|
|
|
1750
|
|
|
1751 if Has_Stream_Size_Clause (U_Type) then
|
|
|
1752 Siz := Static_Integer (Expression (Stream_Size_Clause (U_Type)));
|
|
|
1753 else
|
|
|
1754 Siz := Esize (First_Subtype (U_Type));
|
|
|
1755 end if;
|
|
|
1756
|
|
|
1757 return Siz = Esize (Root_Type (U_Type));
|
|
|
1758 end Has_Stream_Standard_Rep;
|
|
|
1759
|
|
|
1760 ---------------------------------
|
|
|
1761 -- Make_Stream_Subprogram_Name --
|
|
|
1762 ---------------------------------
|
|
|
1763
|
|
|
1764 function Make_Stream_Subprogram_Name
|
|
|
1765 (Loc : Source_Ptr;
|
|
|
1766 Typ : Entity_Id;
|
|
|
1767 Nam : TSS_Name_Type) return Entity_Id
|
|
|
1768 is
|
|
|
1769 Sname : Name_Id;
|
|
|
1770
|
|
|
1771 begin
|
|
|
1772 -- For tagged types, we are dealing with a TSS associated with the
|
|
|
1773 -- declaration, so we use the standard primitive function name. For
|
|
|
1774 -- other types, generate a local TSS name since we are generating
|
|
|
1775 -- the subprogram at the point of use.
|
|
|
1776
|
|
|
1777 if Is_Tagged_Type (Typ) then
|
|
|
1778 Sname := Make_TSS_Name (Typ, Nam);
|
|
|
1779 else
|
|
|
1780 Sname := Make_TSS_Name_Local (Typ, Nam);
|
|
|
1781 end if;
|
|
|
1782
|
|
|
1783 return Make_Defining_Identifier (Loc, Sname);
|
|
|
1784 end Make_Stream_Subprogram_Name;
|
|
|
1785
|
|
|
1786 ----------------------
|
|
|
1787 -- Stream_Base_Type --
|
|
|
1788 ----------------------
|
|
|
1789
|
|
|
1790 function Stream_Base_Type (E : Entity_Id) return Entity_Id is
|
|
|
1791 begin
|
|
|
1792 if Is_Array_Type (E)
|
|
|
1793 and then Is_First_Subtype (E)
|
|
|
1794 then
|
|
|
1795 return E;
|
|
|
1796 else
|
|
|
1797 return Base_Type (E);
|
|
|
1798 end if;
|
|
|
1799 end Stream_Base_Type;
|
|
|
1800
|
|
|
1801 end Exp_Strm;
|
