[a4c754]: libpp / op_header.cpp Maximize Restore History

Download this file

op_header.cpp    258 lines (203 with data), 6.1 kB

  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
/**
* @file op_header.cpp
* various free function acting on a sample file header
*
* @remark Copyright 2004 OProfile authors
* @remark Read the file COPYING
*
* @author John Levon
* @author Philippe Elie
* @Modifications Daniel Hansel
*/
#include <cstring>
#include <iostream>
#include <cstdlib>
#include <iomanip>
#include <set>
#include <sstream>
#include <cstring>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include "op_config.h"
#include "op_exception.h"
#include "odb.h"
#include "op_cpu_type.h"
#include "op_file.h"
#include "op_header.h"
#include "op_events.h"
#include "string_manip.h"
#include "format_output.h"
#include "xml_utils.h"
#include "cverb.h"
using namespace std;
extern verbose vbfd;
void op_check_header(opd_header const & h1, opd_header const & h2,
string const & filename)
{
if (h1.mtime != h2.mtime) {
ostringstream os;
os << "header timestamps are different ("
<< h1.mtime << ", " << h2.mtime << ") for "
<< filename << "\n";
throw op_fatal_error(os.str());
}
if (h1.is_kernel != h2.is_kernel) {
ostringstream os;
os << "header is_kernel flags are different for "
<< filename << "\n";
throw op_fatal_error(os.str());
}
// Note that in the generated ELF file for anonymous code the vma
// of the symbol is exaclty the same vma as the code had during sampling.
// Note that we don't check CPU speed since that can vary
// freely on the same machine
}
namespace {
set<string> warned_files;
}
bool is_jit_sample(string const & filename)
{
// suffix for JIT sample files (see FIXME in check_mtime() below)
string suf = ".jo";
string::size_type pos;
pos = filename.rfind(suf);
// for JIT sample files do not output the warning to stderr.
if (pos != string::npos && pos == filename.size() - suf.size())
return true;
else
return false;
}
void check_mtime(string const & file, opd_header const & header)
{
time_t const newmtime = op_get_mtime(file.c_str());
if (newmtime == header.mtime)
return;
if (warned_files.find(file) != warned_files.end())
return;
warned_files.insert(file);
// Files we couldn't get mtime of have zero mtime
if (!header.mtime) {
// FIXME: header.mtime for JIT sample files is 0. The problem could be that
// in opd_mangling.c:opd_open_sample_file() the call of fill_header()
// think that the JIT sample file is not a binary file.
if (is_jit_sample(file)) {
cverb << vbfd << "warning: could not check that the binary file "
<< file << " has not been modified since "
"the profile was taken. Results may be inaccurate.\n";
} else {
cerr << "warning: could not check that the binary file "
<< file << " has not been modified since "
"the profile was taken. Results may be inaccurate.\n";
}
} else {
static bool warned_already = false;
cerr << "warning: the last modified time of the binary file "
"does not match that of the sample file for " << file
<< "\n";
if (!warned_already) {
cerr << "Either this is the wrong binary or the binary "
"has been modified since the sample file was created.\n";
warned_already = true;
}
}
}
opd_header const read_header(string const & sample_filename)
{
int fd = open(sample_filename.c_str(), O_RDONLY);
if (fd < 0)
throw op_fatal_error("Can't open sample file:" +
sample_filename);
opd_header header;
if (read(fd, &header, sizeof(header)) != sizeof(header)) {
close(fd);
throw op_fatal_error("Can't read sample file header:" +
sample_filename);
}
if (memcmp(header.magic, OPD_MAGIC, sizeof(header.magic))) {
throw op_fatal_error("Invalid sample file, "
"bad magic number: " +
sample_filename);
close(fd);
}
close(fd);
return header;
}
namespace {
string const op_print_event(op_cpu cpu_type, u32 type, u32 um, u32 count)
{
string str;
if (cpu_type == CPU_TIMER_INT) {
str += "Profiling through timer interrupt";
return str;
}
struct op_event * event = op_find_event(cpu_type, type);
if (!event) {
cerr << "Could not locate event " << int(type) << endl;
return str;
}
char const * um_desc = 0;
for (size_t i = 0; i < event->unit->num; ++i) {
if (event->unit->um[i].value == um)
um_desc = event->unit->um[i].desc;
}
str += string("Counted ") + event->name;
str += string(" events (") + event->desc + ")";
if (cpu_type != CPU_RTC) {
str += " with a unit mask of 0x";
ostringstream ss;
ss << hex << setw(2) << setfill('0') << unsigned(um);
str += ss.str();
str += " (";
str += um_desc ? um_desc : "multiple flags";
str += ")";
}
str += " count " + op_lexical_cast<string>(count);
return str;
}
string const op_xml_print_event(op_cpu cpu_type, u32 type, u32 um, u32 count)
{
string unit_mask;
if (cpu_type == CPU_TIMER_INT || cpu_type == CPU_RTC)
return xml_utils::get_timer_setup((size_t)count);
struct op_event * event = op_find_event(cpu_type, type);
if (!event) {
cerr << "Could not locate event " << int(type) << endl;
return "";
}
if (cpu_type != CPU_RTC) {
ostringstream str_out;
str_out << um;
unit_mask = str_out.str();
}
return xml_utils::get_event_setup(string(event->name),
(size_t)count, unit_mask);
}
}
string const describe_header(opd_header const & header)
{
op_cpu cpu = static_cast<op_cpu>(header.cpu_type);
if (want_xml)
return op_xml_print_event(cpu, header.ctr_event,
header.ctr_um, header.ctr_count);
else
return op_print_event(cpu, header.ctr_event,
header.ctr_um, header.ctr_count);
}
string const describe_cpu(opd_header const & header)
{
op_cpu cpu = static_cast<op_cpu>(header.cpu_type);
string str;
if (want_xml) {
string cpu_name = op_get_cpu_name(cpu);
str = xml_utils::get_profile_header(cpu_name, header.cpu_speed);
} else {
str += string("CPU: ") + op_get_cpu_type_str(cpu);
str += ", speed ";
ostringstream ss;
ss << header.cpu_speed;
str += ss.str() + " MHz (estimated)";
}
return str;
}