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
|
-- Analysis for translation.
-- Copyright (C) 2009 Tristan Gingold
--
-- GHDL 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, or (at your option) any later
-- version.
--
-- GHDL 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 GCC; see the file COPYING. If not, write to the Free
-- Software Foundation, 59 Temple Place - Suite 330, Boston, MA
-- 02111-1307, USA.
with Errorout;
with Simple_IO;
with Vhdl.Utils; use Vhdl.Utils;
with Vhdl.Nodes_Walk; use Vhdl.Nodes_Walk;
with Vhdl.Prints;
with Vhdl.Errors; use Vhdl.Errors;
package body Trans_Analyzes is
Driver_List : Iir_List;
Has_After : Boolean;
function Extract_Driver_Target (Target : Iir) return Walk_Status
is
Base : Iir;
Prefix : Iir;
begin
Base := Get_Object_Prefix (Target);
-- Assigment to subprogram interface does not create a driver.
if Get_Kind (Base) = Iir_Kind_Interface_Signal_Declaration
and then Is_Parameter (Base)
then
return Walk_Continue;
end if;
Prefix := Get_Longuest_Static_Prefix (Target);
Add_Element (Driver_List, Prefix);
if Has_After then
Set_After_Drivers_Flag (Base, True);
end if;
return Walk_Continue;
end Extract_Driver_Target;
-- Set Has_After to True iff WF requires a non-direct driver.
procedure Extract_Has_After (Wf : Iir) is
begin
-- Disconnect, or time expression.
if Wf = Null_Iir
or else Get_Chain (Wf) /= Null_Iir
or else Get_Time (Wf) /= Null_Iir
or else Get_Kind (Get_We_Value (Wf)) = Iir_Kind_Null_Literal
then
Has_After := True;
end if;
end Extract_Has_After;
function Extract_Driver_Stmt (Stmt : Iir) return Walk_Status
is
Status : Walk_Status;
pragma Unreferenced (Status);
begin
-- Clear Has_After. It will be set to True if a signal assignment
-- has an delay expression or a null transaction.
-- (It is cleared for any statement, just to factorize code).
Has_After := False;
case Iir_Kinds_Sequential_Statement (Get_Kind (Stmt)) is
when Iir_Kind_Simple_Signal_Assignment_Statement =>
declare
Wf : constant Iir := Get_Waveform_Chain (Stmt);
begin
if Is_Null (Wf)
or else Get_Kind (Wf) /= Iir_Kind_Unaffected_Waveform
then
-- Not unaffected or implicit disconnect.
Extract_Has_After (Wf);
Status := Walk_Assignment_Target
(Get_Target (Stmt), Extract_Driver_Target'Access);
end if;
end;
when Iir_Kind_Conditional_Signal_Assignment_Statement =>
declare
Cond_Wf : Iir;
Wf : Iir;
Has_Drv : Boolean;
begin
Cond_Wf := Get_Conditional_Waveform_Chain (Stmt);
Has_Drv := False;
while Cond_Wf /= Null_Iir loop
Wf := Get_Waveform_Chain (Cond_Wf);
if Get_Kind (Wf) /= Iir_Kind_Unaffected_Waveform then
-- Not unaffected
Extract_Has_After (Wf);
Has_Drv := True;
end if;
Cond_Wf := Get_Chain (Cond_Wf);
end loop;
if Has_Drv then
Status := Walk_Assignment_Target
(Get_Target (Stmt), Extract_Driver_Target'Access);
end if;
end;
when Iir_Kind_Selected_Waveform_Assignment_Statement =>
declare
Swf : Iir;
Wf : Iir;
Has_Drv : Boolean;
begin
Swf := Get_Selected_Waveform_Chain (Stmt);
Has_Drv := False;
while Swf /= Null_Iir loop
if not Get_Same_Alternative_Flag (Swf) then
Wf := Get_Associated_Chain (Swf);
if Get_Kind (Wf) /= Iir_Kind_Unaffected_Waveform then
-- Not unaffected
Extract_Has_After (Wf);
Has_Drv := True;
end if;
end if;
Swf := Get_Chain (Swf);
end loop;
if Has_Drv then
Status := Walk_Assignment_Target
(Get_Target (Stmt), Extract_Driver_Target'Access);
end if;
end;
when Iir_Kind_Procedure_Call_Statement =>
declare
Call : constant Iir := Get_Procedure_Call (Stmt);
Assoc : Iir;
Formal : Iir;
Inter : Iir;
begin
-- Very pessimist.
Has_After := True;
Assoc := Get_Parameter_Association_Chain (Call);
Inter := Get_Interface_Declaration_Chain
(Get_Implementation (Call));
while Assoc /= Null_Iir loop
Formal := Get_Association_Interface (Assoc, Inter);
if Get_Kind (Assoc)
= Iir_Kind_Association_Element_By_Expression
and then
Get_Kind (Formal) = Iir_Kind_Interface_Signal_Declaration
and then Get_Mode (Formal) /= Iir_In_Mode
then
Status := Extract_Driver_Target (Get_Actual (Assoc));
end if;
Next_Association_Interface (Assoc, Inter);
end loop;
end;
when Iir_Kind_Null_Statement
| Iir_Kind_Assertion_Statement
| Iir_Kind_Report_Statement
| Iir_Kind_Wait_Statement
| Iir_Kind_Return_Statement
| Iir_Kind_Next_Statement
| Iir_Kind_Exit_Statement
| Iir_Kind_Variable_Assignment_Statement
| Iir_Kind_Conditional_Variable_Assignment_Statement
| Iir_Kind_For_Loop_Statement
| Iir_Kind_While_Loop_Statement
| Iir_Kind_Case_Statement
| Iir_Kind_If_Statement =>
null;
end case;
return Walk_Continue;
end Extract_Driver_Stmt;
procedure Extract_Drivers_Sequential_Stmt_Chain (Chain : Iir)
is
Status : Walk_Status;
pragma Unreferenced (Status);
begin
Status := Walk_Sequential_Stmt_Chain (Chain, Extract_Driver_Stmt'Access);
end Extract_Drivers_Sequential_Stmt_Chain;
procedure Extract_Drivers_Declaration_Chain (Chain : Iir)
is
Decl : Iir := Chain;
begin
while Decl /= Null_Iir loop
-- Only procedures and impure functions may contain assignment.
if Get_Kind (Decl) = Iir_Kind_Procedure_Body
or else (Get_Kind (Decl) = Iir_Kind_Function_Body
and then
not Get_Pure_Flag (Get_Subprogram_Specification (Decl)))
then
Extract_Drivers_Declaration_Chain (Get_Declaration_Chain (Decl));
Extract_Drivers_Sequential_Stmt_Chain
(Get_Sequential_Statement_Chain (Decl));
end if;
Decl := Get_Chain (Decl);
end loop;
end Extract_Drivers_Declaration_Chain;
function Extract_Drivers (Proc : Iir) return Iir_List
is
begin
Driver_List := Create_Iir_List;
Extract_Drivers_Declaration_Chain (Get_Declaration_Chain (Proc));
Extract_Drivers_Sequential_Stmt_Chain
(Get_Sequential_Statement_Chain (Proc));
return Driver_List;
end Extract_Drivers;
procedure Free_Drivers_List (List : in out Iir_List)
is
It : List_Iterator;
begin
It := List_Iterate (List);
while Is_Valid (It) loop
Set_After_Drivers_Flag (Get_Object_Prefix (Get_Element (It)), False);
Next (It);
end loop;
Destroy_Iir_List (List);
end Free_Drivers_List;
procedure Dump_Drivers (Proc : Iir; List : Iir_List)
is
use Simple_IO;
use Errorout;
El : Iir;
It : List_Iterator;
begin
Report_Msg (Msgid_Note, Semantic, +Proc,
"List of drivers for %n:", (1 => +Proc));
Report_Msg (Msgid_Note, Semantic, +Proc,
" (declared at %l)", (1 => +Proc));
It := List_Iterate (List);
while Is_Valid (It) loop
El := Get_Element (It);
if Get_After_Drivers_Flag (Get_Object_Prefix (El)) then
Put ("* ");
else
Put (" ");
end if;
Vhdl.Prints.Disp_Vhdl (El);
New_Line;
Next (It);
end loop;
end Dump_Drivers;
end Trans_Analyzes;
|
