1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
|
-- Create declarations for synthesis.
-- Copyright (C) 2017 Tristan Gingold
--
-- This file is part of GHDL.
--
-- This program is free software: you can redistribute it and/or modify
-- it under the terms of the GNU General Public License as published by
-- the Free Software Foundation, either version 2 of the License, or
-- (at your option) any later version.
--
-- This program is distributed in the hope that it will be useful,
-- but WITHOUT ANY WARRANTY; without even the implied warranty of
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-- GNU General Public License for more details.
--
-- You should have received a copy of the GNU General Public License
-- along with this program. If not, see <gnu.org/licenses>.
with Vhdl.Errors; use Vhdl.Errors;
with Vhdl.Utils; use Vhdl.Utils;
with Elab.Vhdl_Values; use Elab.Vhdl_Values;
with Elab.Vhdl_Types; use Elab.Vhdl_Types;
with Elab.Vhdl_Files;
with Elab.Vhdl_Errors; use Elab.Vhdl_Errors;
with Elab.Vhdl_Expr; use Elab.Vhdl_Expr;
with Elab.Vhdl_Insts;
with Synth.Vhdl_Expr; use Synth.Vhdl_Expr;
with Synth.Vhdl_Stmts; use Synth.Vhdl_Stmts;
package body Elab.Vhdl_Decls is
procedure Elab_Subprogram_Declaration
(Syn_Inst : Synth_Instance_Acc; Subprg : Node)
is
Inter : Node;
Typ : Type_Acc;
begin
if Is_Second_Subprogram_Specification (Subprg) then
-- Already handled.
return;
end if;
Inter := Get_Interface_Declaration_Chain (Subprg);
while Inter /= Null_Node loop
Typ := Elab_Declaration_Type (Syn_Inst, Inter);
Inter := Get_Chain (Inter);
end loop;
pragma Unreferenced (Typ);
end Elab_Subprogram_Declaration;
procedure Elab_Constant_Declaration (Syn_Inst : Synth_Instance_Acc;
Decl : Node;
Last_Type : in out Node)
is
Deferred_Decl : constant Node := Get_Deferred_Declaration (Decl);
First_Decl : Node;
Decl_Type : Node;
Val : Valtyp;
Obj_Type : Type_Acc;
begin
Obj_Type := Elab_Declaration_Type (Syn_Inst, Decl);
if Deferred_Decl = Null_Node
or else Get_Deferred_Declaration_Flag (Decl)
then
-- Create the object (except for full declaration of a
-- deferred constant).
Create_Object (Syn_Inst, Decl, No_Valtyp);
end if;
-- Initialize the value (except for a deferred declaration).
if Get_Deferred_Declaration_Flag (Decl) then
return;
end if;
if Deferred_Decl = Null_Node then
-- A normal constant declaration
First_Decl := Decl;
else
-- The full declaration of a deferred constant.
First_Decl := Deferred_Decl;
end if;
pragma Assert (First_Decl /= Null_Node);
-- Use the type of the declaration. The type of the constant may
-- be derived from the value.
-- FIXME: what about multiple declarations ?
Decl_Type := Get_Subtype_Indication (Decl);
if Decl_Type = Null_Node then
Decl_Type := Last_Type;
else
if Get_Kind (Decl_Type) in Iir_Kinds_Denoting_Name then
-- Type mark.
Decl_Type := Get_Type (Get_Named_Entity (Decl_Type));
end if;
Last_Type := Decl_Type;
end if;
Val := Synth_Expression_With_Type
(Syn_Inst, Get_Default_Value (Decl), Obj_Type);
if Val = No_Valtyp then
Set_Error (Syn_Inst);
return;
end if;
Val := Exec_Subtype_Conversion (Val, Obj_Type, True, Decl);
Create_Object_Force (Syn_Inst, First_Decl, Val);
end Elab_Constant_Declaration;
procedure Create_Signal (Syn_Inst : Synth_Instance_Acc;
Decl : Node;
Typ : Type_Acc)
is
Def : constant Iir := Get_Default_Value (Decl);
Init : Valtyp;
begin
if Is_Valid (Def) then
Init := Synth_Expression_With_Type (Syn_Inst, Def, Typ);
Init := Exec_Subtype_Conversion (Init, Typ, False, Decl);
else
Init := No_Valtyp;
end if;
Create_Signal (Syn_Inst, Decl, Typ, Init.Val);
end Create_Signal;
procedure Elab_Signal_Declaration (Syn_Inst : Synth_Instance_Acc;
Decl : Node)
is
Obj_Typ : Type_Acc;
begin
Obj_Typ := Elab_Declaration_Type (Syn_Inst, Decl);
Create_Signal (Syn_Inst, Decl, Obj_Typ);
end Elab_Signal_Declaration;
procedure Elab_Variable_Declaration (Syn_Inst : Synth_Instance_Acc;
Decl : Node;
Force_Init : Boolean)
is
Def : constant Node := Get_Default_Value (Decl);
Decl_Type : constant Node := Get_Type (Decl);
Init : Valtyp;
Obj_Typ : Type_Acc;
begin
Obj_Typ := Elab_Declaration_Type (Syn_Inst, Decl);
if Get_Kind (Decl_Type) = Iir_Kind_Protected_Type_Declaration then
Error_Msg_Elab (+Decl, "protected type not supported");
return;
end if;
if Is_Valid (Def) then
Init := Synth_Expression_With_Type (Syn_Inst, Def, Obj_Typ);
Init := Exec_Subtype_Conversion (Init, Obj_Typ, False, Decl);
else
if Force_Init then
Init := Create_Value_Default (Obj_Typ);
else
Init := (Typ => Obj_Typ, Val => null);
end if;
end if;
Create_Object (Syn_Inst, Decl, Init);
end Elab_Variable_Declaration;
procedure Elab_File_Declaration (Syn_Inst : Synth_Instance_Acc;
Decl : Node)
is
F : File_Index;
Res : Valtyp;
Obj_Typ : Type_Acc;
begin
F := Elab.Vhdl_Files.Elaborate_File_Declaration (Syn_Inst, Decl);
Obj_Typ := Get_Subtype_Object (Syn_Inst, Get_Type (Decl));
Res := Create_Value_File (Obj_Typ, F);
Create_Object (Syn_Inst, Decl, Res);
end Elab_File_Declaration;
procedure Elab_Free_Quantity_Declaration (Syn_Inst : Synth_Instance_Acc;
Decl : Node)
is
Obj_Typ : Type_Acc;
Res : Valtyp;
begin
Obj_Typ := Elab_Declaration_Type (Syn_Inst, Decl);
Res := Create_Value_Quantity (Obj_Typ, No_Quantity_Index);
Create_Object (Syn_Inst, Decl, Res);
end Elab_Free_Quantity_Declaration;
procedure Elab_Implicit_Signal_Declaration (Syn_Inst : Synth_Instance_Acc;
Decl : Node)
is
Obj_Typ : Type_Acc;
begin
Obj_Typ := Get_Subtype_Object (Syn_Inst, Get_Type (Decl));
Create_Signal (Syn_Inst, Decl, Obj_Typ, null);
end Elab_Implicit_Signal_Declaration;
procedure Elab_Implicit_Quantity_Declaration (Syn_Inst : Synth_Instance_Acc;
Decl : Node)
is
Obj_Typ : Type_Acc;
Res : Valtyp;
begin
Obj_Typ := Get_Subtype_Object (Syn_Inst, Get_Type (Decl));
Res := Create_Value_Quantity (Obj_Typ, No_Quantity_Index);
Create_Object (Syn_Inst, Decl, Res);
end Elab_Implicit_Quantity_Declaration;
procedure Elab_Terminal_Declaration
(Syn_Inst : Synth_Instance_Acc; Decl : Node)
is
Res : Valtyp;
begin
Res := Create_Value_Terminal (null, No_Terminal_Index);
Create_Object (Syn_Inst, Decl, Res);
end Elab_Terminal_Declaration;
procedure Elab_Nature_Definition
(Syn_Inst : Synth_Instance_Acc; Def : Node)
is
pragma Unreferenced (Syn_Inst);
begin
case Get_Kind (Def) is
when Iir_Kind_Scalar_Nature_Definition =>
null;
when others =>
Error_Kind ("elab_nature_definition", Def);
end case;
end Elab_Nature_Definition;
procedure Elab_Attribute_Specification
(Syn_Inst : Synth_Instance_Acc; Spec : Node)
is
Attr_Decl : constant Node :=
Get_Named_Entity (Get_Attribute_Designator (Spec));
Value : Node;
Val : Valtyp;
Val_Type : Type_Acc;
begin
Val_Type := Get_Subtype_Object (Syn_Inst, Get_Type (Attr_Decl));
Value := Get_Attribute_Value_Spec_Chain (Spec);
while Value /= Null_Iir loop
-- 2. The expression is evaluated to determine the value
-- of the attribute.
-- It is an error if the value of the expression does not
-- belong to the subtype of the attribute; if the
-- attribute is of an array type, then an implicit
-- subtype conversion is first performed on the value,
-- unless the attribute's subtype indication denotes an
-- unconstrained array type.
Val := Synth_Expression_With_Type
(Syn_Inst, Get_Expression (Spec), Val_Type);
-- Check_Constraints (Instance, Val, Attr_Type, Decl);
-- 3. A new instance of the designated attribute is created
-- and associated with each of the affected items.
--
-- 4. Each new attribute instance is assigned the value of
-- the expression.
Create_Object (Syn_Inst, Value, Val);
-- Unshare (Val, Instance_Pool);
Value := Get_Spec_Chain (Value);
end loop;
end Elab_Attribute_Specification;
procedure Elab_Object_Alias_Declaration
(Syn_Inst : Synth_Instance_Acc; Decl : Node)
is
Atype : constant Node := Get_Declaration_Type (Decl);
Off : Value_Offsets;
Res : Valtyp;
Obj_Typ : Type_Acc;
Base : Valtyp;
Typ : Type_Acc;
Dyn : Dyn_Name;
begin
-- Subtype indication may not be present.
if Atype /= Null_Node then
Synth_Subtype_Indication (Syn_Inst, Atype);
Obj_Typ := Get_Subtype_Object (Syn_Inst, Atype);
else
Obj_Typ := null;
end if;
Synth_Assignment_Prefix (Syn_Inst, Get_Name (Decl), Base, Typ, Off, Dyn);
pragma Assert (Dyn = No_Dyn_Name);
Res := Create_Value_Alias (Base, Off, Typ);
if Obj_Typ /= null then
Res := Exec_Subtype_Conversion (Res, Obj_Typ, True, Decl);
end if;
Create_Object (Syn_Inst, Decl, Res);
end Elab_Object_Alias_Declaration;
procedure Elab_Declaration (Syn_Inst : Synth_Instance_Acc;
Decl : Node;
Force_Init : Boolean;
Last_Type : in out Node) is
begin
case Get_Kind (Decl) is
when Iir_Kind_Variable_Declaration =>
Elab_Variable_Declaration (Syn_Inst, Decl, Force_Init);
-- when Iir_Kind_Interface_Variable_Declaration =>
-- -- Ignore default value.
-- Create_Wire_Object (Syn_Inst, Wire_Variable, Decl);
-- Create_Var_Wire (Syn_Inst, Decl, No_Valtyp);
when Iir_Kind_Constant_Declaration =>
Elab_Constant_Declaration (Syn_Inst, Decl, Last_Type);
when Iir_Kind_Signal_Declaration =>
Elab_Signal_Declaration (Syn_Inst, Decl);
when Iir_Kind_Object_Alias_Declaration =>
Elab_Object_Alias_Declaration (Syn_Inst, Decl);
when Iir_Kind_Procedure_Declaration
| Iir_Kind_Function_Declaration =>
Elab_Subprogram_Declaration (Syn_Inst, Decl);
when Iir_Kind_Procedure_Body
| Iir_Kind_Function_Body =>
null;
when Iir_Kind_Non_Object_Alias_Declaration =>
null;
when Iir_Kind_Attribute_Declaration =>
-- Nothing to do: the type is a type_mark, not a subtype
-- indication.
null;
when Iir_Kind_Attribute_Specification =>
Elab_Attribute_Specification (Syn_Inst, Decl);
when Iir_Kind_Type_Declaration =>
Elab_Type_Definition (Syn_Inst, Get_Type_Definition (Decl));
when Iir_Kind_Anonymous_Type_Declaration =>
Elab_Anonymous_Type_Definition
(Syn_Inst, Get_Type_Definition (Decl),
Get_Subtype_Definition (Decl));
when Iir_Kind_Subtype_Declaration =>
declare
T : Type_Acc;
begin
T := Elab_Declaration_Type (Syn_Inst, Decl);
pragma Unreferenced (T);
end;
when Iir_Kind_Component_Declaration =>
null;
when Iir_Kind_File_Declaration =>
Elab_File_Declaration (Syn_Inst, Decl);
when Iir_Kind_Package_Instantiation_Declaration =>
Vhdl_Insts.Elab_Package_Instantiation (Syn_Inst, Decl);
when Iir_Kind_Protected_Type_Body =>
null;
when Iir_Kind_Psl_Default_Clock =>
-- Ignored; directly used by PSL directives.
null;
when Iir_Kind_Use_Clause =>
null;
when Iir_Kind_Configuration_Specification =>
null;
when Iir_Kind_Attribute_Implicit_Declaration =>
declare
El : Node;
begin
El := Get_Attribute_Implicit_Chain (Decl);
while El /= Null_Node loop
Elab_Declaration (Syn_Inst, El, Force_Init, Last_Type);
El := Get_Attr_Chain (El);
end loop;
end;
when Iir_Kind_Nature_Declaration =>
Elab_Nature_Definition (Syn_Inst, Get_Nature (Decl));
when Iir_Kind_Free_Quantity_Declaration =>
Elab_Free_Quantity_Declaration (Syn_Inst, Decl);
when Iir_Kinds_Branch_Quantity_Declaration =>
Elab_Implicit_Quantity_Declaration (Syn_Inst, Decl);
when Iir_Kind_Above_Attribute =>
Elab_Implicit_Signal_Declaration (Syn_Inst, Decl);
when Iir_Kind_Dot_Attribute =>
Elab_Implicit_Quantity_Declaration (Syn_Inst, Decl);
when Iir_Kind_Terminal_Declaration =>
Elab_Terminal_Declaration (Syn_Inst, Decl);
when Iir_Kinds_Signal_Attribute =>
-- Not supported by synthesis.
null;
when Iir_Kind_Suspend_State_Declaration =>
declare
Val : Valtyp;
begin
Val := Create_Value_Memory (Create_Memory_U32 (0));
Create_Object (Syn_Inst, Decl, Val);
end;
when others =>
Vhdl.Errors.Error_Kind ("elab_declaration", Decl);
end case;
end Elab_Declaration;
procedure Elab_Declarations (Syn_Inst : Synth_Instance_Acc;
Decls : Iir;
Force_Init : Boolean := False)
is
Decl : Node;
Last_Type : Node;
begin
Last_Type := Null_Node;
Decl := Decls;
while Is_Valid (Decl) loop
Elab_Declaration (Syn_Inst, Decl, Force_Init, Last_Type);
exit when Is_Error (Syn_Inst);
Decl := Get_Chain (Decl);
end loop;
end Elab_Declarations;
procedure Finalize_Declaration
(Syn_Inst : Synth_Instance_Acc; Decl : Node; Is_Subprg : Boolean)
is
pragma Unreferenced (Syn_Inst);
begin
case Get_Kind (Decl) is
when Iir_Kind_Variable_Declaration
| Iir_Kind_Interface_Variable_Declaration =>
null;
when Iir_Kind_Constant_Declaration =>
null;
when Iir_Kind_Signal_Declaration
| Iir_Kind_Interface_Signal_Declaration =>
pragma Assert (not Is_Subprg);
null;
when Iir_Kind_Object_Alias_Declaration =>
null;
when Iir_Kind_Procedure_Declaration
| Iir_Kind_Function_Declaration =>
null;
when Iir_Kind_Procedure_Body
| Iir_Kind_Function_Body =>
null;
when Iir_Kind_Non_Object_Alias_Declaration =>
null;
when Iir_Kind_Attribute_Declaration =>
null;
when Iir_Kind_Attribute_Specification =>
null;
when Iir_Kind_Type_Declaration =>
null;
when Iir_Kind_Anonymous_Type_Declaration =>
null;
when Iir_Kind_Subtype_Declaration =>
null;
when Iir_Kind_Component_Declaration =>
null;
when Iir_Kind_File_Declaration =>
null;
when Iir_Kind_Configuration_Specification =>
null;
when Iir_Kind_Psl_Default_Clock =>
-- Ignored; directly used by PSL directives.
null;
when Iir_Kind_Attribute_Implicit_Declaration =>
-- Not supported by synthesis.
null;
when others =>
Vhdl.Errors.Error_Kind ("finalize_declaration", Decl);
end case;
end Finalize_Declaration;
procedure Finalize_Declarations (Syn_Inst : Synth_Instance_Acc;
Decls : Iir;
Is_Subprg : Boolean := False)
is
Decl : Iir;
begin
Decl := Decls;
while Is_Valid (Decl) loop
Finalize_Declaration (Syn_Inst, Decl, Is_Subprg);
Decl := Get_Chain (Decl);
end loop;
end Finalize_Declarations;
end Elab.Vhdl_Decls;
|