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
|
/* Code for GIMPLE range trace and debugging related routines.
Copyright (C) 2019-2023 Free Software Foundation, Inc.
Contributed by Andrew MacLeod <amacleod@redhat.com>
and Aldy Hernandez <aldyh@redhat.com>.
This file is part of GCC.
GCC 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 3, or (at your option)
any later version.
GCC 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 COPYING3. If not see
<http://www.gnu.org/licenses/>. */
#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "backend.h"
#include "tree.h"
#include "gimple.h"
#include "ssa.h"
#include "gimple-pretty-print.h"
#include "gimple-iterator.h"
#include "tree-cfg.h"
#include "fold-const.h"
#include "tree-cfg.h"
#include "cfgloop.h"
#include "tree-scalar-evolution.h"
#include "gimple-range.h"
// Breakpoint to trap at a specific index. From GDB, this provides a simple
// place to put a breakpoint to stop at a given trace line.
// ie. b range_tracer::breakpoint if index == 45678
void
range_tracer::breakpoint (unsigned index ATTRIBUTE_UNUSED)
{
}
// Construct a range_tracer with component NAME.
range_tracer::range_tracer (const char *name)
{
gcc_checking_assert (strlen(name) < name_len -1);
strcpy (component, name);
indent = 0;
tracing = false;
}
// This routine does the initial line spacing/indenting for a trace.
// If BLANKS is false, then IDX is printed, otherwise spaces.
void
range_tracer::print_prefix (unsigned idx, bool blanks)
{
// Print counter index as well as INDENT spaces.
if (!blanks)
fprintf (dump_file, "%-7u ", idx);
else
fprintf (dump_file, " ");
fprintf (dump_file, "%s ", component);
unsigned x;
for (x = 0; x< indent; x++)
fputc (' ', dump_file);
}
// If dumping, return the next call index and print the prefix for the next
// output line. If not, retrurn 0.
// Counter is static to monotonically increase across the compilation unit.
unsigned
range_tracer::do_header (const char *str)
{
static unsigned trace_count = 0;
unsigned idx = ++trace_count;
print_prefix (idx, false);
fprintf (dump_file, "%s", str);
indent += bump;
breakpoint (idx);
return idx;
}
// Print a line without starting or ending a trace.
void
range_tracer::print (unsigned counter, const char *str)
{
print_prefix (counter, true);
fprintf (dump_file, "%s", str);
}
// End a trace and print the CALLER, NAME, and RESULT and range R,
void
range_tracer::trailer (unsigned counter, const char *caller, bool result,
tree name, const vrange &r)
{
gcc_checking_assert (tracing && counter != 0);
indent -= bump;
print_prefix (counter, true);
fputs(result ? "TRUE : " : "FALSE : ", dump_file);
fprintf (dump_file, "(%u) ", counter);
fputs (caller, dump_file);
fputs (" (",dump_file);
if (name)
print_generic_expr (dump_file, name, TDF_SLIM);
fputs (") ",dump_file);
if (result)
{
r.dump (dump_file);
fputc('\n', dump_file);
}
else
fputc('\n', dump_file);
}
// =========================================
// Debugging helpers.
// =========================================
// Query all statements in the IL to precalculate computable ranges in RANGER.
DEBUG_FUNCTION void
debug_seed_ranger (gimple_ranger &ranger)
{
// Recalculate SCEV to make sure the dump lists everything.
if (scev_initialized_p ())
{
scev_finalize ();
scev_initialize ();
}
basic_block bb;
gimple_stmt_iterator gsi;
FOR_EACH_BB_FN (bb, cfun)
for (gsi = gsi_start_bb (bb); !gsi_end_p (gsi); gsi_next (&gsi))
{
gimple *stmt = gsi_stmt (gsi);
if (is_gimple_debug (stmt))
continue;
if (tree type = gimple_range_type (stmt))
{
Value_Range r (type);
ranger.range_of_stmt (r, stmt);
}
}
}
// Change the current dump_file and dump_flags to F and FLAGS while
// saving them for later restoring.
push_dump_file::push_dump_file (FILE *f, dump_flags_t flags)
{
old_dump_file = dump_file;
old_dump_flags = dump_flags;
dump_file = f;
dump_flags = flags;
}
// Restore saved dump_file and dump_flags.
push_dump_file::~push_dump_file ()
{
dump_file = old_dump_file;
dump_flags = old_dump_flags;
}
// Dump all that ranger knows for the current function.
void
dump_ranger (FILE *out)
{
push_dump_file save (out, dump_flags);
gimple_ranger ranger;
fprintf (out, ";; Function ");
print_generic_expr (out, current_function_decl);
fprintf (out, "\n");
debug_seed_ranger (ranger);
ranger.dump (out);
}
DEBUG_FUNCTION void
debug_ranger ()
{
dump_ranger (stderr);
}
// Dump all that ranger knows on a path of BBs.
//
// Note that the blocks are in reverse order, thus the exit block is
// path[0].
void
dump_ranger (FILE *dump_file, const vec<basic_block> &path)
{
if (path.length () == 0)
{
fprintf (dump_file, "empty\n");
return;
}
gimple_ranger ranger;
debug_seed_ranger (ranger);
unsigned i = path.length ();
do
{
i--;
ranger.dump_bb (dump_file, path[i]);
}
while (i > 0);
}
DEBUG_FUNCTION void
debug_ranger (const vec<basic_block> &path)
{
dump_ranger (stderr, path);
}
#include "gimple-range-tests.cc"
|
