xpcom/base/nsDebugImpl.cpp
author Carsten "Tomcat" Book <cbook@mozilla.com>
Tue, 02 Jun 2015 13:05:56 +0200
changeset 279080 3c8ed81098ddbe4a4c09e7aa652b5288dc4ce0d3
parent 279055 7c3b45a47811b55f4e973d996dd149c5d575721b
child 279423 e95ddbb300b2c6c24ce8e1af6e60021088b64491
permissions -rw-r--r--
Backed out 14 changesets (bug 1165515) for linux x64 e10s m2 test failures Backed out changeset d68dcf2ef372 (bug 1165515) Backed out changeset 7c3b45a47811 (bug 1165515) Backed out changeset b668b617bef2 (bug 1165515) Backed out changeset d0916e1283a2 (bug 1165515) Backed out changeset ac4dc7489942 (bug 1165515) Backed out changeset e9632ce8bc65 (bug 1165515) Backed out changeset c16d215cc7e4 (bug 1165515) Backed out changeset e4d474f3c51a (bug 1165515) Backed out changeset d87680bf9f7c (bug 1165515) Backed out changeset b3c0a45ba99e (bug 1165515) Backed out changeset 9370fa197674 (bug 1165515) Backed out changeset 50970d668ca1 (bug 1165515) Backed out changeset ffa4eb6d24b9 (bug 1165515) Backed out changeset 5fcf1203cc1d (bug 1165515)

/* -*- 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/. */

// Chromium headers must come before Mozilla headers.
#include "base/process_util.h"

#include "mozilla/Atomics.h"

#include "nsDebugImpl.h"
#include "nsDebug.h"
#ifdef MOZ_CRASHREPORTER
# include "nsExceptionHandler.h"
#endif
#include "nsString.h"
#include "nsXULAppAPI.h"
#include "prprf.h"
#include "mozilla/Logging.h"
#include "nsError.h"
#include "prerror.h"
#include "prerr.h"
#include "prenv.h"

#ifdef ANDROID
#include <android/log.h>
#endif

#ifdef _WIN32
/* for getenv() */
#include <stdlib.h>
#endif

#include "nsTraceRefcnt.h"

#if defined(XP_UNIX)
#include <signal.h>
#endif

#if defined(XP_WIN)
#include <tchar.h>
#include "nsString.h"
#endif

#if defined(XP_MACOSX) || defined(__DragonFly__) || defined(__FreeBSD__) \
 || defined(__NetBSD__) || defined(__OpenBSD__)
#include <stdbool.h>
#include <unistd.h>
#include <sys/param.h>
#include <sys/sysctl.h>
#endif

#if defined(__OpenBSD__)
#include <sys/proc.h>
#endif

#if defined(__DragonFly__) || defined(__FreeBSD__)
#include <sys/user.h>
#endif

#if defined(__NetBSD__)
#undef KERN_PROC
#define KERN_PROC KERN_PROC2
#define KINFO_PROC struct kinfo_proc2
#else
#define KINFO_PROC struct kinfo_proc
#endif

#if defined(XP_MACOSX)
#define KP_FLAGS kp_proc.p_flag
#elif defined(__DragonFly__)
#define KP_FLAGS kp_flags
#elif defined(__FreeBSD__)
#define KP_FLAGS ki_flag
#elif defined(__OpenBSD__) && !defined(_P_TRACED)
#define KP_FLAGS p_psflags
#define P_TRACED PS_TRACED
#else
#define KP_FLAGS p_flag
#endif

#include "mozilla/mozalloc_abort.h"

static void
Abort(const char* aMsg);

static void
RealBreak();

static void
Break(const char* aMsg);

#if defined(_WIN32)
#include <windows.h>
#include <signal.h>
#include <malloc.h> // for _alloca
#elif defined(XP_UNIX)
#include <stdlib.h>
#endif

using namespace mozilla;

static const char* sMultiprocessDescription = nullptr;

static Atomic<int32_t> gAssertionCount;

NS_IMPL_QUERY_INTERFACE(nsDebugImpl, nsIDebug2)

NS_IMETHODIMP_(MozExternalRefCountType)
nsDebugImpl::AddRef()
{
  return 2;
}

NS_IMETHODIMP_(MozExternalRefCountType)
nsDebugImpl::Release()
{
  return 1;
}

NS_IMETHODIMP
nsDebugImpl::Assertion(const char* aStr, const char* aExpr,
                       const char* aFile, int32_t aLine)
{
  NS_DebugBreak(NS_DEBUG_ASSERTION, aStr, aExpr, aFile, aLine);
  return NS_OK;
}

NS_IMETHODIMP
nsDebugImpl::Warning(const char* aStr, const char* aFile, int32_t aLine)
{
  NS_DebugBreak(NS_DEBUG_WARNING, aStr, nullptr, aFile, aLine);
  return NS_OK;
}

NS_IMETHODIMP
nsDebugImpl::Break(const char* aFile, int32_t aLine)
{
  NS_DebugBreak(NS_DEBUG_BREAK, nullptr, nullptr, aFile, aLine);
  return NS_OK;
}

NS_IMETHODIMP
nsDebugImpl::Abort(const char* aFile, int32_t aLine)
{
  NS_DebugBreak(NS_DEBUG_ABORT, nullptr, nullptr, aFile, aLine);
  return NS_OK;
}

NS_IMETHODIMP
nsDebugImpl::GetIsDebugBuild(bool* aResult)
{
#ifdef DEBUG
  *aResult = true;
#else
  *aResult = false;
#endif
  return NS_OK;
}

NS_IMETHODIMP
nsDebugImpl::GetAssertionCount(int32_t* aResult)
{
  *aResult = gAssertionCount;
  return NS_OK;
}

NS_IMETHODIMP
nsDebugImpl::GetIsDebuggerAttached(bool* aResult)
{
  *aResult = false;

#if defined(XP_WIN)
  *aResult = ::IsDebuggerPresent();
#elif defined(XP_MACOSX) || defined(__DragonFly__) || defined(__FreeBSD__) \
   || defined(__NetBSD__) || defined(__OpenBSD__)
  // Specify the info we're looking for
  int mib[] = {
    CTL_KERN,
    KERN_PROC,
    KERN_PROC_PID,
    getpid(),
#if defined(__NetBSD__) || defined(__OpenBSD__)
    sizeof(KINFO_PROC),
    1,
#endif
  };
  u_int mibSize = sizeof(mib) / sizeof(int);

  KINFO_PROC info;
  size_t infoSize = sizeof(info);
  memset(&info, 0, infoSize);

  if (sysctl(mib, mibSize, &info, &infoSize, nullptr, 0)) {
    // if the call fails, default to false
    *aResult = false;
    return NS_OK;
  }

  if (info.KP_FLAGS & P_TRACED) {
    *aResult = true;
  }
#endif

  return NS_OK;
}

/* static */ void
nsDebugImpl::SetMultiprocessMode(const char* aDesc)
{
  sMultiprocessDescription = aDesc;
}

/**
 * Implementation of the nsDebug methods. Note that this code is
 * always compiled in, in case some other module that uses it is
 * compiled with debugging even if this library is not.
 */
static PRLogModuleInfo* gDebugLog;

static void
InitLog()
{
  if (0 == gDebugLog) {
    gDebugLog = PR_NewLogModule("nsDebug");
  }
}

enum nsAssertBehavior
{
  NS_ASSERT_UNINITIALIZED,
  NS_ASSERT_WARN,
  NS_ASSERT_SUSPEND,
  NS_ASSERT_STACK,
  NS_ASSERT_TRAP,
  NS_ASSERT_ABORT,
  NS_ASSERT_STACK_AND_ABORT
};

static nsAssertBehavior
GetAssertBehavior()
{
  static nsAssertBehavior gAssertBehavior = NS_ASSERT_UNINITIALIZED;
  if (gAssertBehavior != NS_ASSERT_UNINITIALIZED) {
    return gAssertBehavior;
  }

  gAssertBehavior = NS_ASSERT_WARN;

  const char* assertString = PR_GetEnv("XPCOM_DEBUG_BREAK");
  if (!assertString || !*assertString) {
    return gAssertBehavior;
  }
  if (!strcmp(assertString, "warn")) {
    return gAssertBehavior = NS_ASSERT_WARN;
  }
  if (!strcmp(assertString, "suspend")) {
    return gAssertBehavior = NS_ASSERT_SUSPEND;
  }
  if (!strcmp(assertString, "stack")) {
    return gAssertBehavior = NS_ASSERT_STACK;
  }
  if (!strcmp(assertString, "abort")) {
    return gAssertBehavior = NS_ASSERT_ABORT;
  }
  if (!strcmp(assertString, "trap") || !strcmp(assertString, "break")) {
    return gAssertBehavior = NS_ASSERT_TRAP;
  }
  if (!strcmp(assertString, "stack-and-abort")) {
    return gAssertBehavior = NS_ASSERT_STACK_AND_ABORT;
  }

  fprintf(stderr, "Unrecognized value of XPCOM_DEBUG_BREAK\n");
  return gAssertBehavior;
}

struct FixedBuffer
{
  FixedBuffer() : curlen(0)
  {
    buffer[0] = '\0';
  }

  char buffer[1000];
  uint32_t curlen;
};

static int
StuffFixedBuffer(void* aClosure, const char* aBuf, uint32_t aLen)
{
  if (!aLen) {
    return 0;
  }

  FixedBuffer* fb = (FixedBuffer*)aClosure;

  // strip the trailing null, we add it again later
  if (aBuf[aLen - 1] == '\0') {
    --aLen;
  }

  if (fb->curlen + aLen >= sizeof(fb->buffer)) {
    aLen = sizeof(fb->buffer) - fb->curlen - 1;
  }

  if (aLen) {
    memcpy(fb->buffer + fb->curlen, aBuf, aLen);
    fb->curlen += aLen;
    fb->buffer[fb->curlen] = '\0';
  }

  return aLen;
}

EXPORT_XPCOM_API(void)
NS_DebugBreak(uint32_t aSeverity, const char* aStr, const char* aExpr,
              const char* aFile, int32_t aLine)
{
  InitLog();

  FixedBuffer buf;
  PRLogModuleLevel ll = PR_LOG_WARNING;
  const char* sevString = "WARNING";

  switch (aSeverity) {
    case NS_DEBUG_ASSERTION:
      sevString = "###!!! ASSERTION";
      ll = PR_LOG_ERROR;
      break;

    case NS_DEBUG_BREAK:
      sevString = "###!!! BREAK";
      ll = PR_LOG_ALWAYS;
      break;

    case NS_DEBUG_ABORT:
      sevString = "###!!! ABORT";
      ll = PR_LOG_ALWAYS;
      break;

    default:
      aSeverity = NS_DEBUG_WARNING;
  };

#  define PrintToBuffer(...) PR_sxprintf(StuffFixedBuffer, &buf, __VA_ARGS__)

  // Print "[PID]" or "[Desc PID]" at the beginning of the message.
  PrintToBuffer("[");
  if (sMultiprocessDescription) {
    PrintToBuffer("%s ", sMultiprocessDescription);
  }
#if !defined(MOZILLA_XPCOMRT_API)
  PrintToBuffer("%d] ", base::GetCurrentProcId());
#endif // !defined(MOZILLA_XPCOMRT_API)

  PrintToBuffer("%s: ", sevString);

  if (aStr) {
    PrintToBuffer("%s: ", aStr);
  }
  if (aExpr) {
    PrintToBuffer("'%s', ", aExpr);
  }
  if (aFile) {
    PrintToBuffer("file %s, ", aFile);
  }
  if (aLine != -1) {
    PrintToBuffer("line %d", aLine);
  }

#  undef PrintToBuffer

  // Write out the message to the debug log
  MOZ_LOG(gDebugLog, ll, ("%s", buf.buffer));
  PR_LogFlush();

  // errors on platforms without a debugdlg ring a bell on stderr
#if !defined(XP_WIN)
  if (ll != PR_LOG_WARNING) {
    fprintf(stderr, "\07");
  }
#endif

#ifdef ANDROID
  __android_log_print(ANDROID_LOG_INFO, "Gecko", "%s", buf.buffer);
#endif

  // Write the message to stderr unless it's a warning and MOZ_IGNORE_WARNINGS
  // is set.
  if (!(PR_GetEnv("MOZ_IGNORE_WARNINGS") && aSeverity == NS_DEBUG_WARNING)) {
    fprintf(stderr, "%s\n", buf.buffer);
    fflush(stderr);
  }

  switch (aSeverity) {
    case NS_DEBUG_WARNING:
      return;

    case NS_DEBUG_BREAK:
      Break(buf.buffer);
      return;

    case NS_DEBUG_ABORT: {
#if defined(MOZ_CRASHREPORTER) && !defined(MOZILLA_XPCOMRT_API)
      // Updating crash annotations in the child causes us to do IPC. This can
      // really cause trouble if we're asserting from within IPC code. So we
      // have to do without the annotations in that case.
      if (XRE_GetProcessType() == GeckoProcessType_Default) {
        nsCString note("xpcom_runtime_abort(");
        note += buf.buffer;
        note += ")";
        CrashReporter::AppendAppNotesToCrashReport(note);
        CrashReporter::AnnotateCrashReport(NS_LITERAL_CSTRING("AbortMessage"),
                                           nsDependentCString(buf.buffer));
      }
#endif  // MOZ_CRASHREPORTER

#if defined(DEBUG) && defined(_WIN32)
      RealBreak();
#endif
#if defined(DEBUG) && !defined(MOZILLA_XPCOMRT_API)
      nsTraceRefcnt::WalkTheStack(stderr);
#endif
      Abort(buf.buffer);
      return;
    }
  }

  // Now we deal with assertions
  gAssertionCount++;

  switch (GetAssertBehavior()) {
    case NS_ASSERT_WARN:
      return;

    case NS_ASSERT_SUSPEND:
#ifdef XP_UNIX
      fprintf(stderr, "Suspending process; attach with the debugger.\n");
      kill(0, SIGSTOP);
#else
      Break(buf.buffer);
#endif
      return;

    case NS_ASSERT_STACK:
#if !defined(MOZILLA_XPCOMRT_API)
      nsTraceRefcnt::WalkTheStack(stderr);
#endif // !defined(MOZILLA_XPCOMRT_API)
      return;

    case NS_ASSERT_STACK_AND_ABORT:
#if !defined(MOZILLA_XPCOMRT_API)
      nsTraceRefcnt::WalkTheStack(stderr);
#endif // !defined(MOZILLA_XPCOMRT_API)
      // Fall through to abort

    case NS_ASSERT_ABORT:
      Abort(buf.buffer);
      return;

    case NS_ASSERT_TRAP:
    case NS_ASSERT_UNINITIALIZED: // Default to "trap" behavior
      Break(buf.buffer);
      return;
  }
}

static void
Abort(const char* aMsg)
{
  mozalloc_abort(aMsg);
}

static void
RealBreak()
{
#if defined(_WIN32)
  ::DebugBreak();
#elif defined(XP_MACOSX)
  raise(SIGTRAP);
#elif defined(__GNUC__) && (defined(__i386__) || defined(__i386) || defined(__x86_64__))
  asm("int $3");
#elif defined(__arm__)
  asm(
#ifdef __ARM_ARCH_4T__
    /* ARMv4T doesn't support the BKPT instruction, so if the compiler target
     * is ARMv4T, we want to ensure the assembler will understand that ARMv5T
     * instruction, while keeping the resulting object tagged as ARMv4T.
     */
    ".arch armv5t\n"
    ".object_arch armv4t\n"
#endif
    "BKPT #0");
#elif defined(SOLARIS)
#if defined(__i386__) || defined(__i386) || defined(__x86_64__)
  asm("int $3");
#else
  raise(SIGTRAP);
#endif
#else
#warning do not know how to break on this platform
#endif
}

// Abort() calls this function, don't call it!
static void
Break(const char* aMsg)
{
#if defined(_WIN32)
  static int ignoreDebugger;
  if (!ignoreDebugger) {
    const char* shouldIgnoreDebugger = getenv("XPCOM_DEBUG_DLG");
    ignoreDebugger =
      1 + (shouldIgnoreDebugger && !strcmp(shouldIgnoreDebugger, "1"));
  }
  if ((ignoreDebugger == 2) || !::IsDebuggerPresent()) {
    DWORD code = IDRETRY;

    /* Create the debug dialog out of process to avoid the crashes caused by
     * Windows events leaking into our event loop from an in process dialog.
     * We do this by launching windbgdlg.exe (built in xpcom/windbgdlg).
     * See http://bugzilla.mozilla.org/show_bug.cgi?id=54792
     */
    PROCESS_INFORMATION pi;
    STARTUPINFOW si;
    wchar_t executable[MAX_PATH];
    wchar_t* pName;

    memset(&pi, 0, sizeof(pi));

    memset(&si, 0, sizeof(si));
    si.cb          = sizeof(si);
    si.wShowWindow = SW_SHOW;

    // 2nd arg of CreateProcess is in/out
    wchar_t* msgCopy = (wchar_t*)_alloca((strlen(aMsg) + 1) * sizeof(wchar_t));
    wcscpy(msgCopy, NS_ConvertUTF8toUTF16(aMsg).get());

    if (GetModuleFileNameW(GetModuleHandleW(L"xpcom.dll"), executable, MAX_PATH) &&
        (pName = wcsrchr(executable, '\\')) != nullptr &&
        wcscpy(pName + 1, L"windbgdlg.exe") &&
        CreateProcessW(executable, msgCopy, nullptr, nullptr,
                       false, DETACHED_PROCESS | NORMAL_PRIORITY_CLASS,
                       nullptr, nullptr, &si, &pi)) {
      WaitForSingleObject(pi.hProcess, INFINITE);
      GetExitCodeProcess(pi.hProcess, &code);
      CloseHandle(pi.hProcess);
      CloseHandle(pi.hThread);
    }

    switch (code) {
      case IDABORT:
        //This should exit us
        raise(SIGABRT);
        //If we are ignored exit this way..
        _exit(3);

      case IDIGNORE:
        return;
    }
  }

  RealBreak();
#elif defined(XP_MACOSX)
  /* Note that we put this Mac OS X test above the GNUC/x86 test because the
   * GNUC/x86 test is also true on Intel Mac OS X and we want the PPC/x86
   * impls to be the same.
   */
  RealBreak();
#elif defined(__GNUC__) && (defined(__i386__) || defined(__i386) || defined(__x86_64__))
  RealBreak();
#elif defined(__arm__)
  RealBreak();
#elif defined(SOLARIS)
  RealBreak();
#else
#warning do not know how to break on this platform
#endif
}

nsresult
nsDebugImpl::Create(nsISupports* aOuter, const nsIID& aIID, void** aInstancePtr)
{
  static const nsDebugImpl* sImpl;

  if (NS_WARN_IF(aOuter)) {
    return NS_ERROR_NO_AGGREGATION;
  }

  if (!sImpl) {
    sImpl = new nsDebugImpl();
  }

  return const_cast<nsDebugImpl*>(sImpl)->QueryInterface(aIID, aInstancePtr);
}

////////////////////////////////////////////////////////////////////////////////

nsresult
NS_ErrorAccordingToNSPR()
{
  PRErrorCode err = PR_GetError();
  switch (err) {
    case PR_OUT_OF_MEMORY_ERROR:         return NS_ERROR_OUT_OF_MEMORY;
    case PR_WOULD_BLOCK_ERROR:           return NS_BASE_STREAM_WOULD_BLOCK;
    case PR_FILE_NOT_FOUND_ERROR:        return NS_ERROR_FILE_NOT_FOUND;
    case PR_READ_ONLY_FILESYSTEM_ERROR:  return NS_ERROR_FILE_READ_ONLY;
    case PR_NOT_DIRECTORY_ERROR:         return NS_ERROR_FILE_NOT_DIRECTORY;
    case PR_IS_DIRECTORY_ERROR:          return NS_ERROR_FILE_IS_DIRECTORY;
    case PR_LOOP_ERROR:                  return NS_ERROR_FILE_UNRESOLVABLE_SYMLINK;
    case PR_FILE_EXISTS_ERROR:           return NS_ERROR_FILE_ALREADY_EXISTS;
    case PR_FILE_IS_LOCKED_ERROR:        return NS_ERROR_FILE_IS_LOCKED;
    case PR_FILE_TOO_BIG_ERROR:          return NS_ERROR_FILE_TOO_BIG;
    case PR_NO_DEVICE_SPACE_ERROR:       return NS_ERROR_FILE_NO_DEVICE_SPACE;
    case PR_NAME_TOO_LONG_ERROR:         return NS_ERROR_FILE_NAME_TOO_LONG;
    case PR_DIRECTORY_NOT_EMPTY_ERROR:   return NS_ERROR_FILE_DIR_NOT_EMPTY;
    case PR_NO_ACCESS_RIGHTS_ERROR:      return NS_ERROR_FILE_ACCESS_DENIED;
    default:                             return NS_ERROR_FAILURE;
  }
}

void
NS_ABORT_OOM(size_t aSize)
{
#if defined(MOZ_CRASHREPORTER) && !defined(MOZILLA_XPCOMRT_API)
  CrashReporter::AnnotateOOMAllocationSize(aSize);
#endif
  MOZ_CRASH();
}