nagai/fune
3
0
Fork 0
forked from mirrors/gecko-dev
Code Pull requests Activity
fune/xpcom/base/Logging.cpp
Tamas Szentpeteri db7f7b5ddf Backed out 3 changesets (bug 1894703) for causing failures related to DOCSHELL logging. CLOSED TREE 
Backed out changeset f9a8141501a7 (bug 1894703)
Backed out changeset e8eb7ab47374 (bug 1894703)
Backed out changeset a84074f814da (bug 1894703)
2024-05-16 21:12:06 +03:00

913 lines
30 KiB
C++
Raw Blame History

/* -*- 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.get(), 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.get()));
if (fileSize <= aSize) {
return true;
}
uint64_t minBytesToDrop = fileSize - aSize;
uint64_t numBytesDropped = 0;
if (fseek(file.get(), 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.get())) {
if (numBytesDropped >= minBytesToDrop) {
if (fputs(line.get(), temp.get()) < 0) {
NS_WARNING(
nsPrintfCString("fputs failed: ferror %d\n", ferror(temp.get()))
.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"
View git blame Copy permalink