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/* -*- 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>
#ifdef XP_WIN
# include <process.h>
# define getpid _getpid
#else
# include <signal.h>
# include <unistd.h>
#endif
#include "js/experimental/CodeCoverage.h"
#include "mozilla/dom/ScriptSettings.h" // for AutoJSAPI
#include "mozilla/CodeCoverageHandler.h"
#include "mozilla/ClearOnShutdown.h"
#include "mozilla/DebugOnly.h"
#include "nsAppRunner.h"
#include "nsIFile.h"
#include "nsIOutputStream.h"
#include "nsNetUtil.h"
#include "nsPrintfCString.h"
#include "prtime.h"
using namespace mozilla;
// The __gcov_flush function writes the coverage counters to gcda files and then
// resets them to zero. It is defined at
// https://github.com/gcc-mirror/gcc/blob/aad93da1a579b9ae23ede6b9cf8523360f0a08b4/libgcc/libgcov-interface.c.
// __gcov_flush is protected by a mutex in GCC, but not in LLVM, so we are using
// a CrossProcessMutex to protect it.
// We rename __gcov_flush to __custom_llvm_gcov_flush in our build of LLVM for
// Linux, to avoid naming clashes in builds which mix GCC and LLVM. So, when we
// are building with LLVM exclusively, we need to use __custom_llvm_gcov_flush
// instead.
#if !defined(XP_WIN) && defined(__clang__)
# define __gcov_flush __custom_llvm_gcov_flush
// In clang 12, __gcov_flush was split into __gcov_dump and __gcov_reset.
# define __gcov_dump __custom_llvm_gcov_dump
# define __gcov_reset __custom_llvm_gcov_reset
#endif
extern "C" void __gcov_flush();
extern "C" void __gcov_dump();
extern "C" void __gcov_reset();
StaticAutoPtr<CodeCoverageHandler> CodeCoverageHandler::instance;
void CodeCoverageHandler::FlushCounters() {
printf_stderr("[CodeCoverage] Requested flush for %d.\n", getpid());
CrossProcessMutexAutoLock lock(*CodeCoverageHandler::Get()->GetMutex());
#if defined(__clang__) && __clang_major__ >= 12
__gcov_dump();
__gcov_reset();
#else
__gcov_flush();
#endif
printf_stderr("[CodeCoverage] flush completed.\n");
const char* outDir = getenv("JS_CODE_COVERAGE_OUTPUT_DIR");
if (!outDir || *outDir == 0) {
return;
}
dom::AutoJSAPI jsapi;
jsapi.Init();
size_t length;
JS::UniqueChars result = js::GetCodeCoverageSummaryAll(jsapi.cx(), &length);
if (!result) {
return;
}
nsCOMPtr<nsIFile> file;
nsresult rv = NS_NewNativeLocalFile(nsDependentCString(outDir), false,
getter_AddRefs(file));
MOZ_ASSERT(NS_SUCCEEDED(rv));
rv = file->AppendNative(
nsPrintfCString("%lu-%d.info", PR_Now() / PR_USEC_PER_MSEC, getpid()));
rv = file->CreateUnique(nsIFile::NORMAL_FILE_TYPE, 0666);
MOZ_ASSERT(NS_SUCCEEDED(rv));
nsCOMPtr<nsIOutputStream> outputStream;
rv = NS_NewLocalFileOutputStream(getter_AddRefs(outputStream), file);
MOZ_ASSERT(NS_SUCCEEDED(rv));
char* data = result.get();
while (length) {
uint32_t n = 0;
rv = outputStream->Write(data, length, &n);
MOZ_ASSERT(NS_SUCCEEDED(rv));
data += n;
length -= n;
}
rv = outputStream->Close();
MOZ_ASSERT(NS_SUCCEEDED(rv));
printf_stderr("[CodeCoverage] JS flush completed.\n");
}
void CodeCoverageHandler::FlushCountersSignalHandler(int) { FlushCounters(); }
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::FlushCountersSignalHandler;
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");
#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);
}
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