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e5e885ae31
# ignore-this-changeset --HG-- extra : amend_source : 7221c8d15a765df71171099468e7c7faa648f37c extra : histedit_source : a0cce6015636202bff09e35a13f72e03257a7695
237 lines
7.2 KiB
C++
237 lines
7.2 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include <algorithm>
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#include "mozilla/IOInterposer.h"
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#include "mozilla/PoisonIOInterposer.h"
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#include "mozilla/ProcessedStack.h"
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#include "mozilla/SHA1.h"
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#include "mozilla/Scoped.h"
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#include "mozilla/StaticPtr.h"
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#include "mozilla/Telemetry.h"
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#include "mozilla/Unused.h"
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#include "nsAppDirectoryServiceDefs.h"
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#include "nsDirectoryServiceUtils.h"
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#include "nsLocalFile.h"
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#include "nsPrintfCString.h"
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#include "mozilla/StackWalk.h"
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#include "plstr.h"
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#include "prio.h"
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#ifdef XP_WIN
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# define NS_SLASH "\\"
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# include <fcntl.h>
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# include <io.h>
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# include <stdio.h>
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# include <stdlib.h>
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# include <sys/stat.h>
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# include <windows.h>
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#else
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# define NS_SLASH "/"
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#endif
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#include "LateWriteChecks.h"
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using namespace mozilla;
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/*************************** Auxiliary Declarations ***************************/
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// This a wrapper over a file descriptor that provides a Printf method and
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// computes the sha1 of the data that passes through it.
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class SHA1Stream {
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public:
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explicit SHA1Stream(FILE* aStream) : mFile(aStream) {
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MozillaRegisterDebugFILE(mFile);
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}
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void Printf(const char* aFormat, ...) MOZ_FORMAT_PRINTF(2, 3) {
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MOZ_ASSERT(mFile);
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va_list list;
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va_start(list, aFormat);
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nsAutoCString str;
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str.AppendPrintf(aFormat, list);
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va_end(list);
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mSHA1.update(str.get(), str.Length());
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Unused << fwrite(str.get(), 1, str.Length(), mFile);
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}
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void Finish(SHA1Sum::Hash& aHash) {
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int fd = fileno(mFile);
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fflush(mFile);
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MozillaUnRegisterDebugFD(fd);
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fclose(mFile);
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mSHA1.finish(aHash);
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mFile = nullptr;
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}
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private:
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FILE* mFile;
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SHA1Sum mSHA1;
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};
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static void RecordStackWalker(uint32_t aFrameNumber, void* aPC, void* aSP,
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void* aClosure) {
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std::vector<uintptr_t>* stack =
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static_cast<std::vector<uintptr_t>*>(aClosure);
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stack->push_back(reinterpret_cast<uintptr_t>(aPC));
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}
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/**************************** Late-Write Observer ****************************/
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/**
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* An implementation of IOInterposeObserver to be registered with IOInterposer.
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* This observer logs all writes as late writes.
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*/
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class LateWriteObserver final : public IOInterposeObserver {
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using char_type = filesystem::Path::value_type;
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public:
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explicit LateWriteObserver(const char_type* aProfileDirectory)
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: mProfileDirectory(NS_xstrdup(aProfileDirectory)) {}
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~LateWriteObserver() {
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free(mProfileDirectory);
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mProfileDirectory = nullptr;
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}
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void Observe(IOInterposeObserver::Observation& aObservation) override;
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private:
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char_type* mProfileDirectory;
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};
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void LateWriteObserver::Observe(IOInterposeObserver::Observation& aOb) {
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// Crash if that is the shutdown check mode
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if (gShutdownChecks == SCM_CRASH) {
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MOZ_CRASH();
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}
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// If we have shutdown mode SCM_NOTHING or we can't record then abort
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if (gShutdownChecks == SCM_NOTHING || !Telemetry::CanRecordExtended()) {
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return;
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}
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// Write the stack and loaded libraries to a file. We can get here
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// concurrently from many writes, so we use multiple temporary files.
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std::vector<uintptr_t> rawStack;
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MozStackWalk(RecordStackWalker, /* skipFrames */ 0, /* maxFrames */ 0,
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&rawStack);
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Telemetry::ProcessedStack stack = Telemetry::GetStackAndModules(rawStack);
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nsTAutoString<char_type> nameAux(mProfileDirectory);
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nameAux.AppendLiteral(NS_SLASH "Telemetry.LateWriteTmpXXXXXX");
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char_type* name = nameAux.BeginWriting();
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// We want the sha1 of the entire file, so please don't write to fd
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// directly; use sha1Stream.
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FILE* stream;
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#ifdef XP_WIN
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HANDLE hFile;
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do {
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// mkstemp isn't supported so keep trying until we get a file
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_wmktemp_s(char16ptr_t(name), NS_strlen(name) + 1);
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hFile = CreateFileW(char16ptr_t(name), GENERIC_WRITE, 0, nullptr,
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CREATE_NEW, FILE_ATTRIBUTE_NORMAL, nullptr);
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} while (GetLastError() == ERROR_FILE_EXISTS);
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if (hFile == INVALID_HANDLE_VALUE) {
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MOZ_CRASH("Um, how did we get here?");
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}
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// http://support.microsoft.com/kb/139640
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int fd = _open_osfhandle((intptr_t)hFile, _O_APPEND);
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if (fd == -1) {
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MOZ_CRASH("Um, how did we get here?");
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}
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stream = _fdopen(fd, "w");
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#else
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int fd = mkstemp(name);
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if (fd == -1) {
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MOZ_CRASH("mkstemp failed");
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}
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stream = fdopen(fd, "w");
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#endif
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SHA1Stream sha1Stream(stream);
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size_t numModules = stack.GetNumModules();
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sha1Stream.Printf("%u\n", (unsigned)numModules);
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for (size_t i = 0; i < numModules; ++i) {
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Telemetry::ProcessedStack::Module module = stack.GetModule(i);
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sha1Stream.Printf("%s %s\n", module.mBreakpadId.get(),
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NS_ConvertUTF16toUTF8(module.mName).get());
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}
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size_t numFrames = stack.GetStackSize();
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sha1Stream.Printf("%u\n", (unsigned)numFrames);
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for (size_t i = 0; i < numFrames; ++i) {
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const Telemetry::ProcessedStack::Frame& frame = stack.GetFrame(i);
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// NOTE: We write the offsets, while the atos tool expects a value with
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// the virtual address added. For example, running otool -l on the the
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// firefox binary shows
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// cmd LC_SEGMENT_64
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// cmdsize 632
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// segname __TEXT
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// vmaddr 0x0000000100000000
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// so to print the line matching the offset 123 one has to run
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// atos -o firefox 0x100000123.
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sha1Stream.Printf("%d %x\n", frame.mModIndex, (unsigned)frame.mOffset);
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}
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SHA1Sum::Hash sha1;
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sha1Stream.Finish(sha1);
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// Note: These files should be deleted by telemetry once it reads them. If
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// there were no telemetry runs by the time we shut down, we just add files
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// to the existing ones instead of replacing them. Given that each of these
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// files is a bug to be fixed, that is probably the right thing to do.
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// We append the sha1 of the contents to the file name. This provides a simple
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// client side deduplication.
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nsAutoString finalName(NS_LITERAL_STRING("Telemetry.LateWriteFinal-"));
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for (int i = 0; i < 20; ++i) {
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finalName.AppendPrintf("%02x", sha1[i]);
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}
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RefPtr<nsLocalFile> file = new nsLocalFile(nameAux);
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file->RenameTo(nullptr, finalName);
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}
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/******************************* Setup/Teardown *******************************/
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static StaticAutoPtr<LateWriteObserver> sLateWriteObserver;
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namespace mozilla {
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void InitLateWriteChecks() {
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nsCOMPtr<nsIFile> mozFile;
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NS_GetSpecialDirectory(NS_APP_USER_PROFILE_50_DIR, getter_AddRefs(mozFile));
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if (mozFile) {
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PathString nativePath = mozFile->NativePath();
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if (nativePath.get()) {
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sLateWriteObserver = new LateWriteObserver(nativePath.get());
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}
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}
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}
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void BeginLateWriteChecks() {
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if (sLateWriteObserver) {
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IOInterposer::Register(IOInterposeObserver::OpWriteFSync,
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sLateWriteObserver);
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}
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}
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void StopLateWriteChecks() {
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if (sLateWriteObserver) {
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IOInterposer::Unregister(IOInterposeObserver::OpAll, sLateWriteObserver);
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// Deallocation would not be thread-safe, and StopLateWriteChecks() is
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// called at shutdown and only in special cases.
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// sLateWriteObserver = nullptr;
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}
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}
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} // namespace mozilla
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