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fune/xpcom/base/Logging.cpp

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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 "mozilla/Logging.h"
#include <algorithm>
#include "base/process_util.h"
#include "GeckoProfiler.h"
#include "mozilla/ClearOnShutdown.h"
#include "mozilla/FileUtils.h"
#include "mozilla/LateWriteChecks.h"
#include "mozilla/Mutex.h"
#include "mozilla/StaticPtr.h"
#include "mozilla/Printf.h"
#include "mozilla/Atomics.h"
#include "mozilla/Sprintf.h"
#include "mozilla/UniquePtrExtensions.h"
#include "MainThreadUtils.h"
#include "nsClassHashtable.h"
#include "nsDebug.h"
#include "nsDebugImpl.h"
#include "nsPrintfCString.h"
#include "NSPRLogModulesParser.h"
#include "nsXULAppAPI.h"
#include "LogCommandLineHandler.h"
#include "prenv.h"
#ifdef XP_WIN
# include <fcntl.h>
# include <process.h>
#else
# include <sys/stat.h> // for umask()
# include <sys/types.h>
# include <unistd.h>
#endif
// NB: Amount determined by performing a typical browsing session and finding
// the maximum number of modules instantiated, and padding up to the next
// power of 2.
const uint32_t kInitialModuleCount = 256;
// When rotate option is added to the modules list, this is the hardcoded
// number of files we create and rotate. When there is rotate:40,
// we will keep four files per process, each limited to 10MB. Sum is 40MB,
// the given limit.
//
// (Note: When this is changed to be >= 10, SandboxBroker::LaunchApp must add
// another rule to allow logfile.?? be written by content processes.)
const uint32_t kRotateFilesNumber = 4;
namespace mozilla {
namespace detail {
void log_print(const LogModule* aModule, LogLevel aLevel, const char* aFmt,
...) {
va_list ap;
va_start(ap, aFmt);
aModule->Printv(aLevel, aFmt, ap);
va_end(ap);
}
void log_print(const LogModule* aModule, LogLevel aLevel, TimeStamp* aStart,
const char* aFmt, ...) {
va_list ap;
va_start(ap, aFmt);
aModule->Printv(aLevel, aStart, aFmt, ap);
va_end(ap);
}
} // namespace detail
LogLevel ToLogLevel(int32_t aLevel) {
aLevel = std::min(aLevel, static_cast<int32_t>(LogLevel::Verbose));
aLevel = std::max(aLevel, static_cast<int32_t>(LogLevel::Disabled));
return static_cast<LogLevel>(aLevel);
}
static const char* ToLogStr(LogLevel aLevel) {
switch (aLevel) {
case LogLevel::Error:
return "E";
case LogLevel::Warning:
return "W";
case LogLevel::Info:
return "I";
case LogLevel::Debug:
return "D";
case LogLevel::Verbose:
return "V";
case LogLevel::Disabled:
default:
MOZ_CRASH("Invalid log level.");
return "";
}
}
namespace detail {
/**
* A helper class providing reference counting for FILE*.
* It encapsulates the following:
* - the FILE handle
* - the order number it was created for when rotating (actual path)
* - number of active references
*/
class LogFile {
FILE* mFile;
uint32_t mFileNum;
public:
LogFile(FILE* aFile, uint32_t aFileNum)
: mFile(aFile), mFileNum(aFileNum), mNextToRelease(nullptr) {}
~LogFile() {
fclose(mFile);
delete mNextToRelease;
}
FILE* File() const { return mFile; }
uint32_t Num() const { return mFileNum; }
LogFile* mNextToRelease;
};
static const char* ExpandLogFileName(const char* aFilename,
char (&buffer)[2048]) {
MOZ_ASSERT(aFilename);
static const char kPIDToken[] = MOZ_LOG_PID_TOKEN;
static const char kMOZLOGExt[] = MOZ_LOG_FILE_EXTENSION;
bool hasMozLogExtension = StringEndsWith(nsDependentCString(aFilename),
nsLiteralCString(kMOZLOGExt));
const char* pidTokenPtr = strstr(aFilename, kPIDToken);
if (pidTokenPtr &&
SprintfLiteral(buffer, "%.*s%s%" PRIPID "%s%s",
static_cast<int>(pidTokenPtr - aFilename), aFilename,
XRE_IsParentProcess() ? "-main." : "-child.",
base::GetCurrentProcId(), pidTokenPtr + strlen(kPIDToken),
hasMozLogExtension ? "" : kMOZLOGExt) > 0) {
return buffer;
}
if (!hasMozLogExtension &&
SprintfLiteral(buffer, "%s%s", aFilename, kMOZLOGExt) > 0) {
return buffer;
}
return aFilename;
}
// Drop initial lines from the given file until it is less than or equal to the
// given size.
//
// For simplicity and to reduce memory consumption, lines longer than the given
// long line size may be broken.
//
// This function uses `mkstemp` and `rename` on POSIX systems and `_mktemp_s`
// and `ReplaceFileA` on Win32 systems. `ReplaceFileA` was introduced in
// Windows 7 so it's available.
bool LimitFileToLessThanSize(const char* aFilename, uint32_t aSize,
uint16_t aLongLineSize = 16384) {
// `tempFilename` will be further updated below.
char tempFilename[2048];
SprintfLiteral(tempFilename, "%s.tempXXXXXX", aFilename);
bool failedToWrite = false;
{ // Scope `file` and `temp`, so that they are definitely closed.
ScopedCloseFile file(fopen(aFilename, "rb"));
if (!file) {
return false;
}
if (fseek(file, 0, SEEK_END)) {
// If we can't seek for some reason, better to just not limit the log at
// all and hope to sort out large logs upon further analysis.
return false;
}
// `ftell` returns a positive `long`, which might be more than 32 bits.
uint64_t fileSize = static_cast<uint64_t>(ftell(file));
if (fileSize <= aSize) {
return true;
}
uint64_t minBytesToDrop = fileSize - aSize;
uint64_t numBytesDropped = 0;
if (fseek(file, 0, SEEK_SET)) {
// Same as above: if we can't seek, hope for the best.
return false;
}
ScopedCloseFile temp;
#if defined(XP_WIN)
// This approach was cribbed from
// https://searchfox.org/mozilla-central/rev/868935867c6241e1302e64cf9be8f56db0fd0d1c/xpcom/build/LateWriteChecks.cpp#158.
HANDLE hFile;
do {
// mkstemp isn't supported so keep trying until we get a file.
_mktemp_s(tempFilename, strlen(tempFilename) + 1);
hFile = CreateFileA(tempFilename, GENERIC_WRITE, 0, nullptr, CREATE_NEW,
FILE_ATTRIBUTE_NORMAL, nullptr);
} while (GetLastError() == ERROR_FILE_EXISTS);
if (hFile == INVALID_HANDLE_VALUE) {
NS_WARNING("INVALID_HANDLE_VALUE");
return false;
}
int fd = _open_osfhandle((intptr_t)hFile, _O_APPEND);
if (fd == -1) {
NS_WARNING("_open_osfhandle failed!");
return false;
}
temp.reset(_fdopen(fd, "ab"));
#elif defined(XP_UNIX)
// Coverity would prefer us to set a secure umask before using `mkstemp`.
// However, the umask is process-wide, so setting it may lead to difficult
// to debug complications; and it is fine for this particular short-lived
// temporary file to be insecure.
//
// coverity[SECURE_TEMP : FALSE]
int fd = mkstemp(tempFilename);
if (fd == -1) {
NS_WARNING("mkstemp failed!");
return false;
}
temp.reset(fdopen(fd, "ab"));
#else
# error Do not know how to open named temporary file
#endif
if (!temp) {
NS_WARNING(nsPrintfCString("could not open named temporary file %s",
tempFilename)
.get());
return false;
}
// `fgets` always null terminates. If the line is too long, it won't
// include a trailing '\n' but will be null-terminated.
UniquePtr<char[]> line = MakeUnique<char[]>(aLongLineSize + 1);
while (fgets(line.get(), aLongLineSize + 1, file)) {
if (numBytesDropped >= minBytesToDrop) {
if (fputs(line.get(), temp) < 0) {
NS_WARNING(
nsPrintfCString("fputs failed: ferror %d\n", ferror(temp)).get());
failedToWrite = true;
break;
}
} else {
// Binary mode avoids platform-specific wrinkles with text streams. In
// particular, on Windows, `\r\n` gets read as `\n` (and the reverse
// when writing), complicating this calculation.
numBytesDropped += strlen(line.get());
}
}
}
// At this point, `file` and `temp` are closed, so we can remove and rename.
if (failedToWrite) {
remove(tempFilename);
return false;
}
#if defined(XP_WIN)
if (!::ReplaceFileA(aFilename, tempFilename, nullptr, 0, 0, 0)) {
NS_WARNING(
nsPrintfCString("ReplaceFileA failed: %lu\n", GetLastError()).get());
return false;
}
#elif defined(XP_UNIX)
if (rename(tempFilename, aFilename)) {
NS_WARNING(
nsPrintfCString("rename failed: %s (%d)\n", strerror(errno), errno)
.get());
return false;
}
#else
# error Do not know how to atomically replace file
#endif
return true;
}
} // namespace detail
namespace {
// Helper method that initializes an empty va_list to be empty.
void empty_va(va_list* va, ...) {
va_start(*va, va);
va_end(*va);
}
} // namespace
class LogModuleManager {
public:
LogModuleManager()
: mModulesLock("logmodules"),
mModules(kInitialModuleCount),
#ifdef DEBUG
mLoggingModuleRegistered(0),
#endif
mPrintEntryCount(0),
mOutFile(nullptr),
mToReleaseFile(nullptr),
mOutFileNum(0),
mOutFilePath(strdup("")),
mMainThread(PR_GetCurrentThread()),
mSetFromEnv(false),
mAddTimestamp(false),
mCaptureProfilerStack(false),
mIsRaw(false),
mIsSync(false),
mRotate(0),
mInitialized(false) {
}
~LogModuleManager() {
detail::LogFile* logFile = mOutFile.exchange(nullptr);
delete logFile;
}
/**
* Loads config from command line args or env vars if present, in
* this specific order of priority.
*
* Notes:
*
* 1) This function is only intended to be called once per session.
* 2) None of the functions used in Init should rely on logging.
*/
void Init(int argc, char* argv[]) {
MOZ_DIAGNOSTIC_ASSERT(!mInitialized);
mInitialized = true;
LoggingHandleCommandLineArgs(argc, static_cast<char const* const*>(argv),
[](nsACString const& env) {
// We deliberately set/rewrite the
// environment variables so that when child
// processes are spawned w/o passing the
// arguments they still inherit the logging
// settings as well as sandboxing can be
// correctly set. Scripts can pass
// -MOZ_LOG=$MOZ_LOG,modules as an argument
// to merge existing settings, if required.
// PR_SetEnv takes ownership of the string.
PR_SetEnv(ToNewCString(env));
});
bool shouldAppend = false;
bool addTimestamp = false;
bool isSync = false;
bool isRaw = false;
bool captureStacks = false;
int32_t rotate = 0;
int32_t maxSize = 0;
bool prependHeader = false;
const char* modules = PR_GetEnv("MOZ_LOG");
if (!modules || !modules[0]) {
modules = PR_GetEnv("MOZ_LOG_MODULES");
if (modules) {
NS_WARNING(
"MOZ_LOG_MODULES is deprecated."
"\nPlease use MOZ_LOG instead.");
}
}
if (!modules || !modules[0]) {
modules = PR_GetEnv("NSPR_LOG_MODULES");
if (modules) {
NS_WARNING(
"NSPR_LOG_MODULES is deprecated."
"\nPlease use MOZ_LOG instead.");
}
}
// Need to capture `this` since `sLogModuleManager` is not set until after
// initialization is complete.
NSPRLogModulesParser(
modules,
[this, &shouldAppend, &addTimestamp, &isSync, &isRaw, &rotate, &maxSize,
&prependHeader, &captureStacks](const char* aName, LogLevel aLevel,
int32_t aValue) mutable {
if (strcmp(aName, "append") == 0) {
shouldAppend = true;
} else if (strcmp(aName, "timestamp") == 0) {
addTimestamp = true;
} else if (strcmp(aName, "sync") == 0) {
isSync = true;
} else if (strcmp(aName, "raw") == 0) {
isRaw = true;
} else if (strcmp(aName, "rotate") == 0) {
rotate = (aValue << 20) / kRotateFilesNumber;
} else if (strcmp(aName, "maxsize") == 0) {
maxSize = aValue << 20;
} else if (strcmp(aName, "prependheader") == 0) {
prependHeader = true;
} else if (strcmp(aName, "profilerstacks") == 0) {
captureStacks = true;
} else {
this->CreateOrGetModule(aName)->SetLevel(aLevel);
}
});
// Rotate implies timestamp to make the files readable
mAddTimestamp = addTimestamp || rotate > 0;
mIsSync = isSync;
mIsRaw = isRaw;
mRotate = rotate;
mCaptureProfilerStack = captureStacks;
if (rotate > 0 && shouldAppend) {
NS_WARNING("MOZ_LOG: when you rotate the log, you cannot use append!");
}
if (rotate > 0 && maxSize > 0) {
NS_WARNING(
"MOZ_LOG: when you rotate the log, you cannot use maxsize! (ignoring "
"maxsize)");
maxSize = 0;
}
if (maxSize > 0 && !shouldAppend) {
NS_WARNING(
"MOZ_LOG: when you limit the log to maxsize, you must use append! "
"(ignorning maxsize)");
maxSize = 0;
}
if (rotate > 0 && prependHeader) {
NS_WARNING(
"MOZ_LOG: when you rotate the log, you cannot use prependheader!");
prependHeader = false;
}
const char* logFile = PR_GetEnv("MOZ_LOG_FILE");
if (!logFile || !logFile[0]) {
logFile = PR_GetEnv("NSPR_LOG_FILE");
}
if (logFile && logFile[0]) {
char buf[2048];
logFile = detail::ExpandLogFileName(logFile, buf);
mOutFilePath.reset(strdup(logFile));
if (mRotate > 0) {
// Delete all the previously captured files, including non-rotated
// log files, so that users don't complain our logs eat space even
// after the rotate option has been added and don't happen to send
// us old large logs along with the rotated files.
remove(mOutFilePath.get());
for (uint32_t i = 0; i < kRotateFilesNumber; ++i) {
RemoveFile(i);
}
}
mOutFile = OpenFile(shouldAppend, mOutFileNum, maxSize);
mSetFromEnv = true;
}
if (prependHeader && XRE_IsParentProcess()) {
va_list va;
empty_va(&va);
Print("Logger", LogLevel::Info, nullptr, "\n***\n\n", "Opening log\n",
va);
}
}
void SetLogFile(const char* aFilename) {
// For now we don't allow you to change the file at runtime.
if (mSetFromEnv) {
NS_WARNING(
"LogModuleManager::SetLogFile - Log file was set from the "
"MOZ_LOG_FILE environment variable.");
return;
}
const char* filename = aFilename ? aFilename : "";
char buf[2048];
filename = detail::ExpandLogFileName(filename, buf);
// Can't use rotate or maxsize at runtime yet.
MOZ_ASSERT(mRotate == 0,
"We don't allow rotate for runtime logfile changes");
mOutFilePath.reset(strdup(filename));
// Exchange mOutFile and set it to be released once all the writes are done.
detail::LogFile* newFile = OpenFile(false, 0);
detail::LogFile* oldFile = mOutFile.exchange(newFile);
// Since we don't allow changing the logfile if MOZ_LOG_FILE is already set,
// and we don't allow log rotation when setting it at runtime,
// mToReleaseFile will be null, so we're not leaking.
DebugOnly<detail::LogFile*> prevFile = mToReleaseFile.exchange(oldFile);
MOZ_ASSERT(!prevFile, "Should be null because rotation is not allowed");
// If we just need to release a file, we must force print, in order to
// trigger the closing and release of mToReleaseFile.
if (oldFile) {
va_list va;
empty_va(&va);
Print("Logger", LogLevel::Info, "Flushing old log files\n", va);
}
}
uint32_t GetLogFile(char* aBuffer, size_t aLength) {
uint32_t len = strlen(mOutFilePath.get());
if (len + 1 > aLength) {
return 0;
}
snprintf(aBuffer, aLength, "%s", mOutFilePath.get());
return len;
}
void SetIsSync(bool aIsSync) { mIsSync = aIsSync; }
void SetCaptureStacks(bool aCaptureStacks) {
mCaptureProfilerStack = aCaptureStacks;
}
void SetAddTimestamp(bool aAddTimestamp) { mAddTimestamp = aAddTimestamp; }
detail::LogFile* OpenFile(bool aShouldAppend, uint32_t aFileNum,
uint32_t aMaxSize = 0) {
FILE* file;
if (mRotate > 0) {
char buf[2048];
SprintfLiteral(buf, "%s.%d", mOutFilePath.get(), aFileNum);
// rotate doesn't support append (or maxsize).
file = fopen(buf, "w");
} else if (aShouldAppend && aMaxSize > 0) {
detail::LimitFileToLessThanSize(mOutFilePath.get(), aMaxSize >> 1);
file = fopen(mOutFilePath.get(), "a");
} else {
file = fopen(mOutFilePath.get(), aShouldAppend ? "a" : "w");
}
if (!file) {
return nullptr;
}
return new detail::LogFile(file, aFileNum);
}
void RemoveFile(uint32_t aFileNum) {
char buf[2048];
SprintfLiteral(buf, "%s.%d", mOutFilePath.get(), aFileNum);
remove(buf);
}
LogModule* CreateOrGetModule(const char* aName) {
OffTheBooksMutexAutoLock guard(mModulesLock);
return mModules
.LookupOrInsertWith(
aName,
[&] {
#ifdef DEBUG
if (++mLoggingModuleRegistered > kInitialModuleCount) {
NS_WARNING(
"kInitialModuleCount too low, consider increasing its "
"value");
}
#endif
return UniquePtr<LogModule>(
new LogModule{aName, LogLevel::Disabled});
})
.get();
}
void Print(const char* aName, LogLevel aLevel, const char* aFmt,
va_list aArgs) MOZ_FORMAT_PRINTF(4, 0) {
Print(aName, aLevel, nullptr, "", aFmt, aArgs);
}
void Print(const char* aName, LogLevel aLevel, const TimeStamp* aStart,
const char* aPrepend, const char* aFmt, va_list aArgs)
MOZ_FORMAT_PRINTF(6, 0) {
AutoSuspendLateWriteChecks suspendLateWriteChecks;
long pid = static_cast<long>(base::GetCurrentProcId());
const size_t kBuffSize = 1024;
char buff[kBuffSize];
char* buffToWrite = buff;
SmprintfPointer allocatedBuff;
va_list argsCopy;
va_copy(argsCopy, aArgs);
int charsWritten = VsprintfLiteral(buff, aFmt, argsCopy);
va_end(argsCopy);
if (charsWritten < 0) {
// Print out at least something. We must copy to the local buff,
// can't just assign aFmt to buffToWrite, since when
// buffToWrite != buff, we try to release it.
MOZ_ASSERT(false, "Probably incorrect format string in LOG?");
strncpy(buff, aFmt, kBuffSize - 1);
buff[kBuffSize - 1] = '\0';
charsWritten = strlen(buff);
} else if (static_cast<size_t>(charsWritten) >= kBuffSize - 1) {
// We may have maxed out, allocate a buffer instead.
allocatedBuff = mozilla::Vsmprintf(aFmt, aArgs);
buffToWrite = allocatedBuff.get();
charsWritten = strlen(buffToWrite);
}
if (profiler_thread_is_being_profiled_for_markers()) {
struct LogMarker {
static constexpr Span<const char> MarkerTypeName() {
return MakeStringSpan("Log");
}
static void StreamJSONMarkerData(
baseprofiler::SpliceableJSONWriter& aWriter,
const ProfilerString8View& aModule,
const ProfilerString8View& aText) {
aWriter.StringProperty("module", aModule);
aWriter.StringProperty("name", aText);
}
static MarkerSchema MarkerTypeDisplay() {
using MS = MarkerSchema;
MS schema{MS::Location::MarkerChart, MS::Location::MarkerTable};
schema.SetTableLabel("({marker.data.module}) {marker.data.name}");
schema.AddKeyLabelFormatSearchable("module", "Module",
MS::Format::String,
MS::Searchable::Searchable);
schema.AddKeyLabelFormatSearchable("name", "Name", MS::Format::String,
MS::Searchable::Searchable);
return schema;
}
};
profiler_add_marker(
"LogMessages", geckoprofiler::category::OTHER,
{aStart ? MarkerTiming::IntervalUntilNowFrom(*aStart)
: MarkerTiming::InstantNow(),
MarkerStack::MaybeCapture(mCaptureProfilerStack)},
LogMarker{}, ProfilerString8View::WrapNullTerminatedString(aName),
ProfilerString8View::WrapNullTerminatedString(buffToWrite));
}
// Determine if a newline needs to be appended to the message.
const char* newline = "";
if (charsWritten == 0 || buffToWrite[charsWritten - 1] != '\n') {
newline = "\n";
}
FILE* out = stderr;
// In case we use rotate, this ensures the FILE is kept alive during
// its use. Increased before we load mOutFile.
++mPrintEntryCount;
detail::LogFile* outFile = mOutFile;
if (outFile) {
out = outFile->File();
}
// This differs from the NSPR format in that we do not output the
// opaque system specific thread pointer (ie pthread_t) cast
// to a long. The address of the current PR_Thread continues to be
// prefixed.
//
// Additionally we prefix the output with the abbreviated log level
// and the module name.
PRThread* currentThread = PR_GetCurrentThread();
const char* currentThreadName = (mMainThread == currentThread)
? "Main Thread"
: PR_GetThreadName(currentThread);
char noNameThread[40];
if (!currentThreadName) {
SprintfLiteral(noNameThread, "Unnamed thread %p", currentThread);
currentThreadName = noNameThread;
}
if (!mAddTimestamp && !aStart) {
if (!mIsRaw) {
fprintf_stderr(out, "%s[%s %ld: %s]: %s/%s %s%s", aPrepend,
nsDebugImpl::GetMultiprocessMode(), pid,
currentThreadName, ToLogStr(aLevel), aName, buffToWrite,
newline);
} else {
fprintf_stderr(out, "%s%s%s", aPrepend, buffToWrite, newline);
}
} else {
if (aStart) {
// XXX is there a reasonable way to convert one to the other? this is
// bad
PRTime prnow = PR_Now();
TimeStamp tmnow = TimeStamp::Now();
TimeDuration duration = tmnow - *aStart;
PRTime prstart = prnow - duration.ToMicroseconds();
PRExplodedTime now;
PRExplodedTime start;
PR_ExplodeTime(prnow, PR_GMTParameters, &now);
PR_ExplodeTime(prstart, PR_GMTParameters, &start);
// Ignore that the start time might be in a different day
fprintf_stderr(
out,
"%s%04d-%02d-%02d %02d:%02d:%02d.%06d -> %02d:%02d:%02d.%06d UTC "
"(%.1gms)- [%s %ld: %s]: %s/%s %s%s",
aPrepend, now.tm_year, now.tm_month + 1, start.tm_mday,
start.tm_hour, start.tm_min, start.tm_sec, start.tm_usec,
now.tm_hour, now.tm_min, now.tm_sec, now.tm_usec,
duration.ToMilliseconds(), nsDebugImpl::GetMultiprocessMode(), pid,
currentThreadName, ToLogStr(aLevel), aName, buffToWrite, newline);
} else {
PRExplodedTime now;
PR_ExplodeTime(PR_Now(), PR_GMTParameters, &now);
fprintf_stderr(out,
"%s%04d-%02d-%02d %02d:%02d:%02d.%06d UTC - [%s %ld: "
"%s]: %s/%s %s%s",
aPrepend, now.tm_year, now.tm_month + 1, now.tm_mday,
now.tm_hour, now.tm_min, now.tm_sec, now.tm_usec,
nsDebugImpl::GetMultiprocessMode(), pid,
currentThreadName, ToLogStr(aLevel), aName, buffToWrite,
newline);
}
}
if (mIsSync) {
fflush(out);
}
if (mRotate > 0 && outFile) {
int32_t fileSize = ftell(out);
if (fileSize > mRotate) {
uint32_t fileNum = outFile->Num();
uint32_t nextFileNum = fileNum + 1;
if (nextFileNum >= kRotateFilesNumber) {
nextFileNum = 0;
}
// And here is the trick. The current out-file remembers its order
// number. When no other thread shifted the global file number yet,
// we are the thread to open the next file.
if (mOutFileNum.compareExchange(fileNum, nextFileNum)) {
// We can work with mToReleaseFile because we are sure the
// mPrintEntryCount can't drop to zero now - the condition
// to actually delete what's stored in that member.
// And also, no other thread can enter this piece of code
// because mOutFile is still holding the current file with
// the non-shifted number. The compareExchange() above is
// a no-op for other threads.
outFile->mNextToRelease = mToReleaseFile;
mToReleaseFile = outFile;
mOutFile = OpenFile(false, nextFileNum);
}
}
}
if (--mPrintEntryCount == 0 && mToReleaseFile) {
// We were the last Print() entered, if there is a file to release
// do it now. exchange() is atomic and makes sure we release the file
// only once on one thread.
detail::LogFile* release = mToReleaseFile.exchange(nullptr);
delete release;
}
}
private:
OffTheBooksMutex mModulesLock;
nsClassHashtable<nsCharPtrHashKey, LogModule> mModules;
#ifdef DEBUG
Atomic<uint32_t, ReleaseAcquire> mLoggingModuleRegistered;
#endif
// Print() entry counter, actually reflects concurrent use of the current
// output file. ReleaseAcquire ensures that manipulation with mOutFile
// and mToReleaseFile is synchronized by manipulation with this value.
Atomic<uint32_t, ReleaseAcquire> mPrintEntryCount;
// File to write to. ReleaseAcquire because we need to sync mToReleaseFile
// with this.
Atomic<detail::LogFile*, ReleaseAcquire> mOutFile;
// File to be released when reference counter drops to zero. This member
// is assigned mOutFile when the current file has reached the limit.
// It can be Relaxed, since it's synchronized with mPrintEntryCount
// manipulation and we do atomic exchange() on it.
Atomic<detail::LogFile*, Relaxed> mToReleaseFile;
// The next file number. This is mostly only for synchronization sake.
// Can have relaxed ordering, since we only do compareExchange on it which
// is atomic regardless ordering.
Atomic<uint32_t, Relaxed> mOutFileNum;
// Just keeps the actual file path for further use.
UniqueFreePtr<char[]> mOutFilePath;
PRThread* mMainThread;
bool mSetFromEnv;
Atomic<bool, Relaxed> mAddTimestamp;
Atomic<bool, Relaxed> mCaptureProfilerStack;
Atomic<bool, Relaxed> mIsRaw;
Atomic<bool, Relaxed> mIsSync;
int32_t mRotate;
bool mInitialized;
};
StaticAutoPtr<LogModuleManager> sLogModuleManager;
LogModule* LogModule::Get(const char* aName) {
// This is just a pass through to the LogModuleManager so
// that the LogModuleManager implementation can be kept internal.
MOZ_ASSERT(sLogModuleManager != nullptr);
return sLogModuleManager->CreateOrGetModule(aName);
}
void LogModule::SetLogFile(const char* aFilename) {
MOZ_ASSERT(sLogModuleManager);
sLogModuleManager->SetLogFile(aFilename);
}
uint32_t LogModule::GetLogFile(char* aBuffer, size_t aLength) {
MOZ_ASSERT(sLogModuleManager);
return sLogModuleManager->GetLogFile(aBuffer, aLength);
}
void LogModule::SetAddTimestamp(bool aAddTimestamp) {
sLogModuleManager->SetAddTimestamp(aAddTimestamp);
}
void LogModule::SetIsSync(bool aIsSync) {
sLogModuleManager->SetIsSync(aIsSync);
}
void LogModule::SetCaptureStacks(bool aCaptureStacks) {
sLogModuleManager->SetCaptureStacks(aCaptureStacks);
}
// This function is defined in gecko_logger/src/lib.rs
// We mirror the level in rust code so we don't get forwarded all of the
// rust logging and have to create an LogModule for each rust component.
extern "C" void set_rust_log_level(const char* name, uint8_t level);
void LogModule::SetLevel(LogLevel level) {
mLevel = level;
// If the log module contains `::` it is likely a rust module, so we
// pass the level into the rust code so it will know to forward the logging
// to Gecko.
if (strstr(mName, "::")) {
set_rust_log_level(mName, static_cast<uint8_t>(level));
}
}
void LogModule::Init(int argc, char* argv[]) {
// NB: This method is not threadsafe; it is expected to be called very early
// in startup prior to any other threads being run.
MOZ_DIAGNOSTIC_ASSERT(NS_IsMainThread());
if (sLogModuleManager) {
// Already initialized.
return;
}
// NB: We intentionally do not register for ClearOnShutdown as that happens
// before all logging is complete. And, yes, that means we leak, but
// we're doing that intentionally.
// Don't assign the pointer until after Init is called. This should help us
// detect if any of the functions called by Init somehow rely on logging.
auto mgr = new LogModuleManager();
mgr->Init(argc, argv);
sLogModuleManager = mgr;
}
void LogModule::Printv(LogLevel aLevel, const char* aFmt, va_list aArgs) const {
MOZ_ASSERT(sLogModuleManager != nullptr);
// Forward to LogModule manager w/ level and name
sLogModuleManager->Print(Name(), aLevel, aFmt, aArgs);
}
void LogModule::Printv(LogLevel aLevel, const TimeStamp* aStart,
const char* aFmt, va_list aArgs) const {
MOZ_ASSERT(sLogModuleManager != nullptr);
// Forward to LogModule manager w/ level and name
sLogModuleManager->Print(Name(), aLevel, aStart, "", aFmt, aArgs);
}
} // namespace mozilla
extern "C" {
// This function is called by external code (rust) to log to one of our
// log modules.
void ExternMozLog(const char* aModule, mozilla::LogLevel aLevel,
const char* aMsg) {
MOZ_ASSERT(mozilla::sLogModuleManager != nullptr);
mozilla::LogModule* m =
mozilla::sLogModuleManager->CreateOrGetModule(aModule);
if (MOZ_LOG_TEST(m, aLevel)) {
mozilla::detail::log_print(m, aLevel, "%s", aMsg);
}
}
} // extern "C"
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