gecko-dev/tools/code-coverage/CodeCoverageHandler.cpp

129 строки
3.3 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
#include <stdio.h>
#ifndef XP_WIN
#include <signal.h>
#include <unistd.h>
#endif
#include "mozilla/CodeCoverageHandler.h"
#include "mozilla/ClearOnShutdown.h"
#include "mozilla/DebugOnly.h"
#include "nsAppRunner.h"
using namespace mozilla;
// The __gcov_dump function writes the coverage counters to gcda files.
// The __gcov_reset function resets the coverage counters to zero.
// They are defined at https://github.com/gcc-mirror/gcc/blob/aad93da1a579b9ae23ede6b9cf8523360f0a08b4/libgcc/libgcov-interface.c.
// __gcov_flush is protected by a mutex, __gcov_dump and __gcov_reset aren't.
// So we are using a CrossProcessMutex to protect them.
#if defined(__GNUC__) && !defined(__clang__)
extern "C" void __gcov_dump();
extern "C" void __gcov_reset();
void counters_dump() {
__gcov_dump();
}
void counters_reset() {
__gcov_reset();
}
#else
void counters_dump() {
/* Do nothing */
}
void counters_reset() {
/* Do nothing */
}
#endif
StaticAutoPtr<CodeCoverageHandler> CodeCoverageHandler::instance;
void CodeCoverageHandler::DumpCounters(int)
{
CrossProcessMutexAutoLock lock(*CodeCoverageHandler::Get()->GetMutex());
printf_stderr("[CodeCoverage] Requested dump.\n");
counters_dump();
printf_stderr("[CodeCoverage] Dump completed.\n");
}
void CodeCoverageHandler::ResetCounters(int)
{
CrossProcessMutexAutoLock lock(*CodeCoverageHandler::Get()->GetMutex());
printf_stderr("[CodeCoverage] Requested reset.\n");
counters_reset();
printf_stderr("[CodeCoverage] Reset completed.\n");
}
void CodeCoverageHandler::SetSignalHandlers()
{
#ifndef XP_WIN
printf_stderr("[CodeCoverage] Setting handlers for process %d.\n", getpid());
struct sigaction dump_sa;
dump_sa.sa_handler = CodeCoverageHandler::DumpCounters;
dump_sa.sa_flags = SA_RESTART;
sigemptyset(&dump_sa.sa_mask);
DebugOnly<int> r1 = sigaction(SIGUSR1, &dump_sa, nullptr);
MOZ_ASSERT(r1 == 0, "Failed to install GCOV SIGUSR1 handler");
struct sigaction reset_sa;
reset_sa.sa_handler = CodeCoverageHandler::ResetCounters;
reset_sa.sa_flags = SA_RESTART;
sigemptyset(&reset_sa.sa_mask);
DebugOnly<int> r2 = sigaction(SIGUSR2, &reset_sa, nullptr);
MOZ_ASSERT(r2 == 0, "Failed to install GCOV SIGUSR2 handler");
#endif
}
CodeCoverageHandler::CodeCoverageHandler()
: mGcovLock("GcovLock")
{
SetSignalHandlers();
}
CodeCoverageHandler::CodeCoverageHandler(const CrossProcessMutexHandle& aHandle)
: mGcovLock(aHandle)
{
SetSignalHandlers();
}
void CodeCoverageHandler::Init()
{
MOZ_ASSERT(!instance);
MOZ_ASSERT(XRE_IsParentProcess());
instance = new CodeCoverageHandler();
ClearOnShutdown(&instance);
}
void CodeCoverageHandler::Init(const CrossProcessMutexHandle& aHandle)
{
MOZ_ASSERT(!instance);
MOZ_ASSERT(!XRE_IsParentProcess());
instance = new CodeCoverageHandler(aHandle);
ClearOnShutdown(&instance);
}
CodeCoverageHandler* CodeCoverageHandler::Get()
{
MOZ_ASSERT(instance);
return instance;
}
CrossProcessMutex* CodeCoverageHandler::GetMutex()
{
return &mGcovLock;
}
CrossProcessMutexHandle CodeCoverageHandler::GetMutexHandle(int aProcId)
{
return mGcovLock.ShareToProcess(aProcId);
}