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
|
-- GHDL Run Time (GRT) - processes.
-- Copyright (C) 2002, 2003, 2004, 2005 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 System;
with Grt.Stack2; use Grt.Stack2;
with Grt.Types; use Grt.Types;
with Grt.Signals; use Grt.Signals;
with Grt.Stacks;
with Grt.Rtis; use Grt.Rtis;
with Grt.Rtis_Addr;
with Grt.Stdio;
package Grt.Processes is
pragma Suppress (All_Checks);
-- Internal initialisations.
procedure Init;
-- Do the VHDL simulation.
-- Return 0 in case of success (end of time reached).
function Simulation return Integer;
-- Number of delta cycles.
Nbr_Delta_Cycles : Integer;
-- Number of non-delta cycles.
Nbr_Cycles : Integer;
-- If true, the simulation should be stopped.
Break_Simulation : Boolean;
type Process_Type is private;
-- type Process_Acc is access all Process_Type;
-- Return the identifier of the current process.
-- During the elaboration, this is the identifier of the last process
-- being elaborated. So, this function can be used to create signal
-- drivers.
-- Return the total number of processes and number of sensitized processes.
-- Used for statistics.
function Get_Nbr_Processes return Natural;
function Get_Nbr_Sensitized_Processes return Natural;
-- Total number of resumed processes.
function Get_Nbr_Resumed_Processes return Natural;
-- Disp the name of process PROC.
procedure Disp_Process_Name (Stream : Grt.Stdio.FILEs; Proc : Process_Acc);
-- Register a process during elaboration.
-- This procedure is called by vhdl elaboration code.
procedure Ghdl_Process_Register (Instance : System.Address;
Proc : System.Address;
Ctxt : Ghdl_Rti_Access;
Addr : System.Address);
procedure Ghdl_Sensitized_Process_Register (Instance : System.Address;
Proc : System.Address;
Ctxt : Ghdl_Rti_Access;
Addr : System.Address);
procedure Ghdl_Postponed_Process_Register (Instance : System.Address;
Proc : System.Address;
Ctxt : Ghdl_Rti_Access;
Addr : System.Address);
procedure Ghdl_Postponed_Sensitized_Process_Register
(Instance : System.Address;
Proc : System.Address;
Ctxt : Ghdl_Rti_Access;
Addr : System.Address);
procedure Ghdl_Initial_Register (Instance : System.Address;
Proc : System.Address);
procedure Ghdl_Always_Register (Instance : System.Address;
Proc : System.Address);
-- Add a simple signal in the sensitivity of the last registered
-- (sensitized) process.
procedure Ghdl_Process_Add_Sensitivity (Sig : Ghdl_Signal_Ptr);
-- Resume a process.
procedure Resume_Process (Proc : Process_Acc);
-- Wait without timeout or sensitivity.
procedure Ghdl_Process_Wait_Exit;
-- Wait for a timeout.
procedure Ghdl_Process_Wait_Timeout (Time : Std_Time);
-- Add a sensitivity for a wait.
procedure Ghdl_Process_Wait_Add_Sensitivity (Sig : Ghdl_Signal_Ptr);
-- Add a timeout for a wait.
procedure Ghdl_Process_Wait_Set_Timeout (Time : Std_Time);
-- Wait until timeout or sensitivity.
-- Return TRUE in case of timeout.
function Ghdl_Process_Wait_Suspend return Boolean;
-- Finish a wait statement.
procedure Ghdl_Process_Wait_Close;
-- Verilog.
procedure Ghdl_Process_Delay (Del : Ghdl_U32);
function Ghdl_Stack2_Allocate (Size : Ghdl_Index_Type)
return System.Address;
function Ghdl_Stack2_Mark return Mark_Id;
procedure Ghdl_Stack2_Release (Mark : Mark_Id);
-- Protected variables.
procedure Ghdl_Protected_Enter (Obj : System.Address);
procedure Ghdl_Protected_Leave (Obj : System.Address);
procedure Ghdl_Protected_Init (Obj : System.Address);
procedure Ghdl_Protected_Fini (Obj : System.Address);
private
-- Access to a process subprogram.
type Proc_Acc is access procedure (Self : System.Address);
-- State of a process.
type Process_State is
(
-- Sensitized process. Its state cannot change.
State_Sensitized,
-- Non-sensitized process, ready to run.
State_Ready,
-- Verilog process, being suspended.
State_Delayed,
-- Non-sensitized process being suspended.
State_Wait,
-- Non-sensitized process being awaked by a wait timeout. This state
-- is transcient.
-- This is necessary so that the process will exit immediately from the
-- wait statements without checking if the wait condition is true.
State_Timeout,
-- Non-sensitized process waiting until end.
State_Dead);
type Process_Type is record
-- Stack for the process.
-- This must be the first field of the record (and this is the only
-- part visible).
-- Must be NULL_STACK for sensitized processes.
Stack : Stacks.Stack_Type;
-- Subprogram containing process code.
Subprg : Proc_Acc;
-- Instance (THIS parameter) for the subprogram.
This : System.Address;
-- Name of the process.
Rti : Rtis_Addr.Rti_Context;
-- True if the process is resumed and will be run at next cycle.
Resumed : Boolean;
-- True if the process is postponed.
Postponed : Boolean;
State : Process_State;
-- Timeout value for wait.
Timeout : Std_Time;
-- Sensitivity list while the (non-sensitized) process is waiting.
Sensitivity : Action_List_Acc;
Timeout_Chain_Next : Process_Acc;
Timeout_Chain_Prev : Process_Acc;
end record;
pragma Export (C, Ghdl_Process_Register,
"__ghdl_process_register");
pragma Export (C, Ghdl_Sensitized_Process_Register,
"__ghdl_sensitized_process_register");
pragma Export (C, Ghdl_Postponed_Process_Register,
"__ghdl_postponed_process_register");
pragma Export (C, Ghdl_Postponed_Sensitized_Process_Register,
"__ghdl_postponed_sensitized_process_register");
pragma Export (C, Ghdl_Always_Register, "__ghdl_always_register");
pragma Export (C, Ghdl_Initial_Register, "__ghdl_initial_register");
pragma Export (C, Ghdl_Process_Add_Sensitivity,
"__ghdl_process_add_sensitivity");
pragma Export (C, Ghdl_Process_Wait_Exit,
"__ghdl_process_wait_exit");
pragma Export (C, Ghdl_Process_Wait_Timeout,
"__ghdl_process_wait_timeout");
pragma Export (C, Ghdl_Process_Wait_Add_Sensitivity,
"__ghdl_process_wait_add_sensitivity");
pragma Export (C, Ghdl_Process_Wait_Set_Timeout,
"__ghdl_process_wait_set_timeout");
pragma Export (Ada, Ghdl_Process_Wait_Suspend,
"__ghdl_process_wait_suspend");
pragma Export (C, Ghdl_Process_Wait_Close,
"__ghdl_process_wait_close");
pragma Export (C, Ghdl_Process_Delay, "__ghdl_process_delay");
pragma Export (C, Ghdl_Stack2_Allocate, "__ghdl_stack2_allocate");
pragma Export (C, Ghdl_Stack2_Mark, "__ghdl_stack2_mark");
pragma Export (C, Ghdl_Stack2_Release, "__ghdl_stack2_release");
pragma Export (C, Ghdl_Protected_Enter, "__ghdl_protected_enter");
pragma Export (C, Ghdl_Protected_Leave, "__ghdl_protected_leave");
pragma Export (C, Ghdl_Protected_Init, "__ghdl_protected_init");
pragma Export (C, Ghdl_Protected_Fini, "__ghdl_protected_fini");
end Grt.Processes;
|
