258 lines
7.1 KiB
C++
258 lines
7.1 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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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 "nsAppDirectoryServiceDefs.h"
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#include "nsDirectoryServiceUtils.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_T(str) L ## str
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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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#define OBSERVE_LATE_WRITES
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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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{
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public:
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explicit SHA1Stream(FILE* aStream)
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: mFile(aStream)
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{
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MozillaRegisterDebugFILE(mFile);
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}
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void Printf(const char* aFormat, ...)
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{
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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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fwrite(str.get(), 1, str.Length(), mFile);
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}
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void Finish(SHA1Sum::Hash& aHash)
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{
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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
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RecordStackWalker(uint32_t aFrameNumber, void* aPC, void* aSP, void* aClosure)
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{
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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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{
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public:
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explicit LateWriteObserver(const char* aProfileDirectory)
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: mProfileDirectory(PL_strdup(aProfileDirectory))
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{
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}
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~LateWriteObserver()
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{
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PL_strfree(mProfileDirectory);
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mProfileDirectory = nullptr;
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}
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void Observe(IOInterposeObserver::Observation& aObservation);
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private:
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char* mProfileDirectory;
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};
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void
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LateWriteObserver::Observe(IOInterposeObserver::Observation& aOb)
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{
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#ifdef OBSERVE_LATE_WRITES
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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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reinterpret_cast<void*>(&rawStack), 0, nullptr);
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Telemetry::ProcessedStack stack = Telemetry::GetStackAndModules(rawStack);
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nsPrintfCString nameAux("%s%s%s", mProfileDirectory,
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NS_SLASH, "Telemetry.LateWriteTmpXXXXXX");
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char* name;
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nameAux.GetMutableData(&name);
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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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int result = _mktemp_s(name, strlen(name) + 1);
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hFile = CreateFileA(name, GENERIC_WRITE, 0, nullptr, CREATE_NEW,
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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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NS_RUNTIMEABORT("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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NS_RUNTIMEABORT("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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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.c_str(),
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module.mName.c_str());
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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 firefox
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// 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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nsPrintfCString finalName("%s%s", mProfileDirectory,
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"/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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PR_Delete(finalName.get());
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PR_Rename(name, finalName.get());
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#endif
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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
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InitLateWriteChecks()
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{
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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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nsAutoCString nativePath;
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nsresult rv = mozFile->GetNativePath(nativePath);
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if (NS_SUCCEEDED(rv) && 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
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BeginLateWriteChecks()
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{
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if (sLateWriteObserver) {
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IOInterposer::Register(
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IOInterposeObserver::OpWriteFSync,
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sLateWriteObserver
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);
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}
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}
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void
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StopLateWriteChecks()
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{
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if (sLateWriteObserver) {
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IOInterposer::Unregister(
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IOInterposeObserver::OpAll,
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sLateWriteObserver
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);
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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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