blob: 754015af2745a71c0384b27b74cfd271e85d40a5 [file] [log] [blame]
/**
* @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))) {
close(fd);
throw op_fatal_error("Invalid sample file, "
"bad magic number: " +
sample_filename);
}
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, um);
if (!event) {
event = op_find_event_any(cpu_type, type);
if (!event) {
cerr << "Could not locate event " << int(type) << endl;
str = "Unknown event";
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, um);
if (!event) {
event = op_find_event_any(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;
}