зеркало из https://github.com/mozilla/gecko-dev.git
258 строки
7.2 KiB
C++
258 строки
7.2 KiB
C++
/* -*- 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 <algorithm>
|
|
|
|
#include "mozilla/IOInterposer.h"
|
|
#include "mozilla/PoisonIOInterposer.h"
|
|
#include "mozilla/ProcessedStack.h"
|
|
#include "mozilla/SHA1.h"
|
|
#include "mozilla/Scoped.h"
|
|
#include "mozilla/StaticPtr.h"
|
|
#include "mozilla/Telemetry.h"
|
|
#include "nsAppDirectoryServiceDefs.h"
|
|
#include "nsDirectoryServiceUtils.h"
|
|
#include "nsPrintfCString.h"
|
|
#include "mozilla/StackWalk.h"
|
|
#include "plstr.h"
|
|
#include "prio.h"
|
|
|
|
#ifdef XP_WIN
|
|
#define NS_T(str) L ## str
|
|
#define NS_SLASH "\\"
|
|
#include <fcntl.h>
|
|
#include <io.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <sys/stat.h>
|
|
#include <windows.h>
|
|
#else
|
|
#define NS_SLASH "/"
|
|
#endif
|
|
|
|
#include "LateWriteChecks.h"
|
|
|
|
using namespace mozilla;
|
|
|
|
/*************************** Auxiliary Declarations ***************************/
|
|
|
|
// This a wrapper over a file descriptor that provides a Printf method and
|
|
// computes the sha1 of the data that passes through it.
|
|
class SHA1Stream
|
|
{
|
|
public:
|
|
explicit SHA1Stream(FILE* aStream)
|
|
: mFile(aStream)
|
|
{
|
|
MozillaRegisterDebugFILE(mFile);
|
|
}
|
|
|
|
void Printf(const char* aFormat, ...) MOZ_FORMAT_PRINTF(2, 3)
|
|
{
|
|
MOZ_ASSERT(mFile);
|
|
va_list list;
|
|
va_start(list, aFormat);
|
|
nsAutoCString str;
|
|
str.AppendPrintf(aFormat, list);
|
|
va_end(list);
|
|
mSHA1.update(str.get(), str.Length());
|
|
fwrite(str.get(), 1, str.Length(), mFile);
|
|
}
|
|
void Finish(SHA1Sum::Hash& aHash)
|
|
{
|
|
int fd = fileno(mFile);
|
|
fflush(mFile);
|
|
MozillaUnRegisterDebugFD(fd);
|
|
fclose(mFile);
|
|
mSHA1.finish(aHash);
|
|
mFile = nullptr;
|
|
}
|
|
private:
|
|
FILE* mFile;
|
|
SHA1Sum mSHA1;
|
|
};
|
|
|
|
static void
|
|
RecordStackWalker(uint32_t aFrameNumber, void* aPC, void* aSP, void* aClosure)
|
|
{
|
|
std::vector<uintptr_t>* stack =
|
|
static_cast<std::vector<uintptr_t>*>(aClosure);
|
|
stack->push_back(reinterpret_cast<uintptr_t>(aPC));
|
|
}
|
|
|
|
/**************************** Late-Write Observer ****************************/
|
|
|
|
/**
|
|
* An implementation of IOInterposeObserver to be registered with IOInterposer.
|
|
* This observer logs all writes as late writes.
|
|
*/
|
|
class LateWriteObserver final : public IOInterposeObserver
|
|
{
|
|
public:
|
|
explicit LateWriteObserver(const char* aProfileDirectory)
|
|
: mProfileDirectory(PL_strdup(aProfileDirectory))
|
|
{
|
|
}
|
|
~LateWriteObserver()
|
|
{
|
|
PL_strfree(mProfileDirectory);
|
|
mProfileDirectory = nullptr;
|
|
}
|
|
|
|
void Observe(IOInterposeObserver::Observation& aObservation);
|
|
private:
|
|
char* mProfileDirectory;
|
|
};
|
|
|
|
void
|
|
LateWriteObserver::Observe(IOInterposeObserver::Observation& aOb)
|
|
{
|
|
// Crash if that is the shutdown check mode
|
|
if (gShutdownChecks == SCM_CRASH) {
|
|
MOZ_CRASH();
|
|
}
|
|
|
|
// If we have shutdown mode SCM_NOTHING or we can't record then abort
|
|
if (gShutdownChecks == SCM_NOTHING || !Telemetry::CanRecordExtended()) {
|
|
return;
|
|
}
|
|
|
|
// Write the stack and loaded libraries to a file. We can get here
|
|
// concurrently from many writes, so we use multiple temporary files.
|
|
std::vector<uintptr_t> rawStack;
|
|
|
|
MozStackWalk(RecordStackWalker, /* skipFrames */ 0, /* maxFrames */ 0,
|
|
reinterpret_cast<void*>(&rawStack), 0, nullptr);
|
|
Telemetry::ProcessedStack stack = Telemetry::GetStackAndModules(rawStack);
|
|
|
|
nsPrintfCString nameAux("%s%s%s", mProfileDirectory,
|
|
NS_SLASH, "Telemetry.LateWriteTmpXXXXXX");
|
|
char* name;
|
|
nameAux.GetMutableData(&name);
|
|
|
|
// We want the sha1 of the entire file, so please don't write to fd
|
|
// directly; use sha1Stream.
|
|
FILE* stream;
|
|
#ifdef XP_WIN
|
|
HANDLE hFile;
|
|
do {
|
|
// mkstemp isn't supported so keep trying until we get a file
|
|
int result = _mktemp_s(name, strlen(name) + 1);
|
|
hFile = CreateFileA(name, GENERIC_WRITE, 0, nullptr, CREATE_NEW,
|
|
FILE_ATTRIBUTE_NORMAL, nullptr);
|
|
} while (GetLastError() == ERROR_FILE_EXISTS);
|
|
|
|
if (hFile == INVALID_HANDLE_VALUE) {
|
|
MOZ_CRASH("Um, how did we get here?");
|
|
}
|
|
|
|
// http://support.microsoft.com/kb/139640
|
|
int fd = _open_osfhandle((intptr_t)hFile, _O_APPEND);
|
|
if (fd == -1) {
|
|
MOZ_CRASH("Um, how did we get here?");
|
|
}
|
|
|
|
stream = _fdopen(fd, "w");
|
|
#else
|
|
int fd = mkstemp(name);
|
|
if (fd == -1) {
|
|
MOZ_CRASH("mkstemp failed");
|
|
}
|
|
stream = fdopen(fd, "w");
|
|
#endif
|
|
|
|
SHA1Stream sha1Stream(stream);
|
|
|
|
size_t numModules = stack.GetNumModules();
|
|
sha1Stream.Printf("%u\n", (unsigned)numModules);
|
|
for (size_t i = 0; i < numModules; ++i) {
|
|
Telemetry::ProcessedStack::Module module = stack.GetModule(i);
|
|
sha1Stream.Printf("%s %s\n", module.mBreakpadId.c_str(),
|
|
NS_ConvertUTF16toUTF8(module.mName).get());
|
|
}
|
|
|
|
size_t numFrames = stack.GetStackSize();
|
|
sha1Stream.Printf("%u\n", (unsigned)numFrames);
|
|
for (size_t i = 0; i < numFrames; ++i) {
|
|
const Telemetry::ProcessedStack::Frame& frame = stack.GetFrame(i);
|
|
// NOTE: We write the offsets, while the atos tool expects a value with
|
|
// the virtual address added. For example, running otool -l on the the firefox
|
|
// binary shows
|
|
// cmd LC_SEGMENT_64
|
|
// cmdsize 632
|
|
// segname __TEXT
|
|
// vmaddr 0x0000000100000000
|
|
// so to print the line matching the offset 123 one has to run
|
|
// atos -o firefox 0x100000123.
|
|
sha1Stream.Printf("%d %x\n", frame.mModIndex, (unsigned)frame.mOffset);
|
|
}
|
|
|
|
SHA1Sum::Hash sha1;
|
|
sha1Stream.Finish(sha1);
|
|
|
|
// Note: These files should be deleted by telemetry once it reads them. If
|
|
// there were no telemetry runs by the time we shut down, we just add files
|
|
// to the existing ones instead of replacing them. Given that each of these
|
|
// files is a bug to be fixed, that is probably the right thing to do.
|
|
|
|
// We append the sha1 of the contents to the file name. This provides a simple
|
|
// client side deduplication.
|
|
nsPrintfCString finalName("%s%s", mProfileDirectory,
|
|
"/Telemetry.LateWriteFinal-");
|
|
for (int i = 0; i < 20; ++i) {
|
|
finalName.AppendPrintf("%02x", sha1[i]);
|
|
}
|
|
PR_Delete(finalName.get());
|
|
PR_Rename(name, finalName.get());
|
|
}
|
|
|
|
/******************************* Setup/Teardown *******************************/
|
|
|
|
static StaticAutoPtr<LateWriteObserver> sLateWriteObserver;
|
|
|
|
namespace mozilla {
|
|
|
|
void
|
|
InitLateWriteChecks()
|
|
{
|
|
nsCOMPtr<nsIFile> mozFile;
|
|
NS_GetSpecialDirectory(NS_APP_USER_PROFILE_50_DIR, getter_AddRefs(mozFile));
|
|
if (mozFile) {
|
|
nsAutoCString nativePath;
|
|
nsresult rv = mozFile->GetNativePath(nativePath);
|
|
if (NS_SUCCEEDED(rv) && nativePath.get()) {
|
|
sLateWriteObserver = new LateWriteObserver(nativePath.get());
|
|
}
|
|
}
|
|
}
|
|
|
|
void
|
|
BeginLateWriteChecks()
|
|
{
|
|
if (sLateWriteObserver) {
|
|
IOInterposer::Register(
|
|
IOInterposeObserver::OpWriteFSync,
|
|
sLateWriteObserver
|
|
);
|
|
}
|
|
}
|
|
|
|
void
|
|
StopLateWriteChecks()
|
|
{
|
|
if (sLateWriteObserver) {
|
|
IOInterposer::Unregister(
|
|
IOInterposeObserver::OpAll,
|
|
sLateWriteObserver
|
|
);
|
|
// Deallocation would not be thread-safe, and StopLateWriteChecks() is
|
|
// called at shutdown and only in special cases.
|
|
// sLateWriteObserver = nullptr;
|
|
}
|
|
}
|
|
|
|
} // namespace mozilla
|