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log.cpp
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log.cpp
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#include "tthread/log.h"
#include <assert.h>
#include <cstddef>
#include <errno.h>
#include <execinfo.h>
#include <stdexcept>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mman.h>
#include "xglobals.h"
#include "xlogger.h"
namespace tthread {
extern xlogger *logger;
log::log() :
_logOffset(0),
_log(NULL)
{
openLog(tthread::logger->getLogFd());
}
// all events since offset
log::log(off_t offset) :
_logOffset(offset),
_log(NULL)
{
ASSERT(offset > 0);
openLog(tthread::logger->getLogFd());
}
log::log(int logFd) :
_logOffset(0),
_log(NULL)
{
openLog(logFd);
}
log::log(int logFd, off_t offset) :
_logOffset(offset),
_log(NULL)
{
ASSERT(offset > 0);
openLog(logFd);
}
log::~log() {
munmap(_log, _logSize);
}
size_t log::length() const {
return (_logSize - _logOffset) / sizeof(logevent);
}
logevent log::get(unsigned long i) {
if (i > length()) {
throw std::out_of_range("not in range of log");
}
return _log[i];
}
void log::print() const {
fprintf(stderr, "______Page Access Result_______\n");
unsigned int llen = length();
for (unsigned long i = 0; i < llen; i++) {
logevent e = _log[i];
const tthread::EventData data = e.getData();
switch (e.getType()) {
case tthread::logevent::READ:
case tthread::logevent::WRITE:
{
const char *access = e.getType() == logevent::READ ? "read" : "write";
fprintf(stderr,
"[%s] threadId: %d, address: %p, pageStart: %p, issued at: ",
access,
e.getThreadId(),
data.memory.address,
((void *)PAGE_ALIGN_DOWN(
data.memory.address)));
// hacky solution to print backtrace without using malloc
void *issuerAddress = (void *)e.getReturnAddress();
backtrace_symbols_fd(&issuerAddress, 1, fileno(stderr));
break;
}
case tthread::logevent::THUNK:
{
fprintf(stderr,
"[thunk] threadId: %d, id: %d, issued at: ",
e.getThreadId(),
data.thunk.id);
void *thunkStart = (void *)e.getReturnAddress();
backtrace_symbols_fd(&thunkStart, 1, fileno(stderr));
break;
}
case tthread::logevent::INVALID:
fprintf(stderr, "[invalid entry]\n");
break;
case tthread::logevent::FINISH:
fprintf(stderr, "[finish] child %d finished\n", e.getThreadId());
default:
// invalid state
ASSERT(1);
}
}
}
logheader *log::readHeader(int logFd) {
char *buf = (char *)WRAP(mmap)(NULL,
xlogger::HEADER_SIZE,
PROT_READ,
MAP_SHARED,
logFd,
0);
if (buf == MAP_FAILED) {
fprintf(stderr, "failed to read header: %s", strerror(errno));
::abort();
}
return (tthread::logheader *)buf;
}
void log::openLog(int logFd) {
assert(logFile >= 0);
_header = log::readHeader(logFd);
assert(_header->checkFileMagick());
_logSize = *_header->getEventCount() * xlogger::EVENT_SIZE;
if (_logSize == 0) {
// zero entries logged yet, skip opening the log -> _log == NULL
return;
}
size_t alignedOffset = PAGE_ALIGN_DOWN(_logOffset);
size_t diff = _logOffset - alignedOffset;
size_t alignedSize = _logSize + diff;
char *buf = (char *)WRAP(mmap)(NULL,
alignedSize,
PROT_READ,
MAP_SHARED,
logFd,
alignedOffset + xlogger::HEADER_SIZE);
if (buf == MAP_FAILED) {
fprintf(stderr, "tthread::log: mmap error: %s\n", strerror(errno));
::abort();
}
_log = (logevent *)(buf + diff);
}
}