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/**************************************************************************
*
* Copyright 2007-2011 VMware, Inc.
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
**************************************************************************/
#include <assert.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "os.hpp"
#include "os_thread.hpp"
#include "os_string.hpp"
#include "trace_file.hpp"
#include "trace_writer_local.hpp"
#include "trace_format.hpp"
namespace trace {
static const char *memcpy_args[3] = {"dest", "src", "n"};
const FunctionSig memcpy_sig = {0, "memcpy", 3, memcpy_args};
static const char *malloc_args[1] = {"size"};
const FunctionSig malloc_sig = {1, "malloc", 1, malloc_args};
static const char *free_args[1] = {"ptr"};
const FunctionSig free_sig = {2, "free", 1, free_args};
static const char *realloc_args[2] = {"ptr", "size"};
const FunctionSig realloc_sig = {3, "realloc", 2, realloc_args};
static void exceptionCallback(void)
{
localWriter.flush();
}
LocalWriter::LocalWriter() :
acquired(0)
{
// Install the signal handlers as early as possible, to prevent
// interfering with the application's signal handling.
os::setExceptionCallback(exceptionCallback);
}
LocalWriter::~LocalWriter()
{
os::resetExceptionCallback();
}
void
LocalWriter::open(void) {
os::String szFileName;
const char *lpFileName;
lpFileName = getenv("TRACE_FILE");
if (!lpFileName) {
static unsigned dwCounter = 0;
os::String process = os::getProcessName();
#ifdef _WIN32
process.trimExtension();
#endif
process.trimDirectory();
#ifdef ANDROID
os::String prefix = "/data";
#else
os::String prefix = os::getCurrentDir();
#endif
prefix.join(process);
for (;;) {
FILE *file;
if (dwCounter)
szFileName = os::String::format("%s.%u.trace", prefix.str(), dwCounter);
else
szFileName = os::String::format("%s.trace", prefix.str());
lpFileName = szFileName;
file = fopen(lpFileName, "rb");
if (file == NULL)
break;
fclose(file);
++dwCounter;
}
}
os::log("apitrace: tracing to %s\n", lpFileName);
if (!Writer::open(lpFileName)) {
os::log("apitrace: error: failed to open %s\n", lpFileName);
os::abort();
}
#if 0
// For debugging the exception handler
*((int *)0) = 0;
#endif
}
static uintptr_t next_thread_num = 1;
static OS_THREAD_SPECIFIC_PTR(void)
thread_num;
unsigned LocalWriter::beginEnter(const FunctionSig *sig) {
mutex.lock();
++acquired;
if (!m_file->isOpened()) {
open();
}
// Although thread_num is a void *, we actually use it as a uintptr_t
uintptr_t this_thread_num =
reinterpret_cast<uintptr_t>(static_cast<void *>(thread_num));
if (!this_thread_num) {
this_thread_num = next_thread_num++;
thread_num = reinterpret_cast<void *>(this_thread_num);
}
assert(this_thread_num);
unsigned thread_id = this_thread_num - 1;
return Writer::beginEnter(sig, thread_id);
}
void LocalWriter::endEnter(void) {
Writer::endEnter();
--acquired;
mutex.unlock();
}
void LocalWriter::beginLeave(unsigned call) {
mutex.lock();
++acquired;
Writer::beginLeave(call);
}
void LocalWriter::endLeave(void) {
Writer::endLeave();
--acquired;
mutex.unlock();
}
void LocalWriter::flush(void) {
/*
* Do nothing if the mutex is already acquired (e.g., if a segfault happen
* while writing the file) as state could be inconsistent, therefore yield
* inconsistent trace files and/or repeated segfaults till infinity.
*/
mutex.lock();
if (acquired) {
os::log("apitrace: ignoring exception while tracing\n");
} else {
++acquired;
if (m_file->isOpened()) {
os::log("apitrace: flushing trace due to an exception\n");
m_file->flush();
}
--acquired;
}
mutex.unlock();
}
LocalWriter localWriter;
} /* namespace trace */
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