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
|
/*
* yosys -- Yosys Open SYnthesis Suite
*
* Copyright (C) 2012 Clifford Wolf <clifford@clifford.at>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
*/
#include "kernel/register.h"
#include "kernel/sigtools.h"
#include "kernel/log.h"
#include <stdlib.h>
#include <stdio.h>
USING_YOSYS_NAMESPACE
PRIVATE_NAMESPACE_BEGIN
struct RmportsPassPass : public Pass {
RmportsPassPass() : Pass("rmports", "remove module ports with no connections") { }
void help() YS_OVERRIDE
{
// |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
log("\n");
log(" rmports [selection]\n");
log("\n");
log("This pass identifies ports in the selected modules which are not used or\n");
log("driven and removes them.\n");
log("\n");
}
void execute(std::vector<std::string> args, RTLIL::Design *design) YS_OVERRIDE
{
log_header(design, "Executing RMPORTS pass (remove ports with no connections).\n");
size_t argidx = 1;
extra_args(args, argidx, design);
// The set of ports we removed
dict<IdString, pool<IdString>> removed_ports;
// Find all of the unused ports, and remove them from that module
auto modules = design->selected_modules();
for(auto mod : modules)
ScanModule(mod, removed_ports);
// Remove the unused ports from all instances of those modules
for(auto mod : modules)
CleanupModule(mod, removed_ports);
}
void CleanupModule(Module *module, dict<IdString, pool<IdString>> &removed_ports)
{
log("Removing now-unused cell ports in module %s\n", module->name.c_str());
auto cells = module->cells();
for(auto cell : cells)
{
if(removed_ports.find(cell->type) == removed_ports.end())
{
// log(" Not touching instance \"%s\" because we didn't remove any ports from module \"%s\"\n",
// cell->name.c_str(), cell->type.c_str());
continue;
}
auto ports_to_remove = removed_ports[cell->type];
for(auto p : ports_to_remove)
{
log(" Removing port \"%s\" from instance \"%s\"\n",
p.c_str(), cell->type.c_str());
cell->unsetPort(p);
}
}
}
void ScanModule(Module* module, dict<IdString, pool<IdString>> &removed_ports)
{
log("Finding unconnected ports in module %s\n", module->name.c_str());
pool<IdString> used_ports;
// See what wires are used.
// Start by checking connections between named wires
auto &conns = module->connections();
for(auto sigsig : conns)
{
auto s1 = sigsig.first;
auto s2 = sigsig.second;
int len1 = s1.size();
int len2 = s2.size();
int len = len1;
if(len2 < len1)
len = len2;
for(int i=0; i<len; i++)
{
auto w1 = s1[i].wire;
auto w2 = s2[i].wire;
if( (w1 == NULL) || (w2 == NULL) )
continue;
//log(" conn %s, %s\n", w1->name.c_str(), w2->name.c_str());
if( (w1->port_input || w1->port_output) && (used_ports.find(w1->name) == used_ports.end()) )
used_ports.insert(w1->name);
if( (w2->port_input || w2->port_output) && (used_ports.find(w2->name) == used_ports.end()) )
used_ports.insert(w2->name);
}
}
// Then check connections to cells
auto cells = module->cells();
for(auto cell : cells)
{
auto &cconns = cell->connections();
for(auto conn : cconns)
{
for(int i=0; i<conn.second.size(); i++)
{
auto sig = conn.second[i].wire;
if(sig == NULL)
continue;
// log(" sig %s\n", sig->name.c_str());
if( (sig->port_input || sig->port_output) && (used_ports.find(sig->name) == used_ports.end()) )
used_ports.insert(sig->name);
}
}
}
// Now that we know what IS used, get rid of anything that isn't in that list
pool<IdString> unused_ports;
for(auto port : module->ports)
{
if(used_ports.find(port) != used_ports.end())
continue;
unused_ports.insert(port);
}
// Print the ports out as we go through them
for(auto port : unused_ports)
{
log(" removing unused port %s\n", port.c_str());
removed_ports[module->name].insert(port);
// Remove from ports list
for(size_t i=0; i<module->ports.size(); i++)
{
if(module->ports[i] == port)
{
module->ports.erase(module->ports.begin() + i);
break;
}
}
// Mark the wire as no longer a port
auto wire = module->wire(port);
wire->port_input = false;
wire->port_output = false;
wire->port_id = 0;
}
log("Removed %zu unused ports.\n", unused_ports.size());
// Re-number all of the wires that DO have ports still on them
for(size_t i=0; i<module->ports.size(); i++)
{
auto port = module->ports[i];
auto wire = module->wire(port);
wire->port_id = i+1;
}
}
} RmportsPassPass;
PRIVATE_NAMESPACE_END
|
