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gecko/xpcom/base/nsDebugImpl.cpp

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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 "prprf.h"
#include "prlog.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 "nsTraceRefcntImpl.h"
#if defined(XP_UNIX)
#include <signal.h>
#endif
#if defined(XP_WIN)
#include <tchar.h>
#include "nsString.h"
#ifdef MOZ_METRO
#include "nsWindowsHelpers.h"
#endif
#endif
#if defined(XP_MACOSX)
#include <stdbool.h>
#include <unistd.h>
#include <sys/sysctl.h>
#endif
#include "mozilla/mozalloc_abort.h"
static void
Abort(const char *aMsg);
static void
RealBreak();
static void
Break(const char *aMsg);
#if defined(XP_OS2)
# define INCL_WINDIALOGS // need for WinMessageBox
# include <os2.h>
# include <string.h>
#endif /* XP_OS2 */
#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 bool sIsMultiprocess = false;
static const char *sMultiprocessDescription = nullptr;
static Atomic<int32_t> gAssertionCount;
NS_IMPL_QUERY_INTERFACE2(nsDebugImpl, nsIDebug, nsIDebug2)
NS_IMETHODIMP_(nsrefcnt)
nsDebugImpl::AddRef()
{
return 2;
}
NS_IMETHODIMP_(nsrefcnt)
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)
// Specify the info we're looking for
int mib[4];
mib[0] = CTL_KERN;
mib[1] = KERN_PROC;
mib[2] = KERN_PROC_PID;
mib[3] = getpid();
size_t mibSize = sizeof(mib) / sizeof(int);
struct 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_proc.p_flag & P_TRACED) {
*aResult = true;
}
#endif
return NS_OK;
}
/* static */ void
nsDebugImpl::SetMultiprocessMode(const char *aDesc)
{
sIsMultiprocess = true;
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(void)
{
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;
#if defined(XP_WIN) && defined(MOZ_METRO)
if (IsRunningInWindowsMetro())
gAssertBehavior = NS_ASSERT_WARN;
else
gAssertBehavior = NS_ASSERT_TRAP;
#elif defined(XP_WIN) || defined(XP_OS2)
gAssertBehavior = NS_ASSERT_TRAP;
#else
gAssertBehavior = NS_ASSERT_WARN;
#endif
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 *closure, const char *buf, uint32_t len)
{
if (!len)
return 0;
FixedBuffer *fb = (FixedBuffer*) closure;
// strip the trailing null, we add it again later
if (buf[len - 1] == '\0')
--len;
if (fb->curlen + len >= sizeof(fb->buffer))
len = sizeof(fb->buffer) - fb->curlen - 1;
if (len) {
memcpy(fb->buffer + fb->curlen, buf, len);
fb->curlen += len;
fb->buffer[fb->curlen] = '\0';
}
return len;
}
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__)
// If we're multiprocess, print "[PID]" or "[Desc PID]" at the beginning of
// the message.
if (sIsMultiprocess) {
PrintToBuffer("[");
if (sMultiprocessDescription) {
PrintToBuffer("%s ", sMultiprocessDescription);
}
PrintToBuffer("%d] ", base::GetCurrentProcId());
}
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
PR_LOG(gDebugLog, ll, ("%s", buf.buffer));
PR_LogFlush();
// errors on platforms without a debugdlg ring a bell on stderr
#if !defined(XP_WIN) && !defined(XP_OS2)
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)
nsCString note("xpcom_runtime_abort(");
note += buf.buffer;
note += ")";
CrashReporter::AppendAppNotesToCrashReport(note);
#endif // MOZ_CRASHREPORTER
#if defined(DEBUG) && defined(_WIN32)
RealBreak();
#endif
#ifdef DEBUG
nsTraceRefcntImpl::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:
nsTraceRefcntImpl::WalkTheStack(stderr);
return;
case NS_ASSERT_STACK_AND_ABORT:
nsTraceRefcntImpl::WalkTheStack(stderr);
// 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_OS2)
asm("int $3");
#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;
PRUnichar executable[MAX_PATH];
PRUnichar* 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
PRUnichar *msgCopy = (PRUnichar*) _alloca((strlen(aMsg) + 1)*sizeof(PRUnichar));
wcscpy(msgCopy , (PRUnichar*)NS_ConvertUTF8toUTF16(aMsg).get());
if(GetModuleFileNameW(GetModuleHandleW(L"xpcom.dll"), (LPWCH)executable, MAX_PATH) &&
nullptr != (pName = wcsrchr(executable, '\\')) &&
nullptr != wcscpy((WCHAR*)pName + 1, L"windbgdlg.exe") &&
CreateProcessW((LPCWSTR)executable, (LPWSTR)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_OS2)
char msg[1200];
PR_snprintf(msg, sizeof(msg),
"%s\n\nClick Cancel to Debug Application.\n"
"Click Enter to continue running the Application.", aMsg);
ULONG code = MBID_ERROR;
code = WinMessageBox(HWND_DESKTOP, HWND_DESKTOP, msg,
"NSGlue_Assertion", 0,
MB_ERROR | MB_ENTERCANCEL);
/* It is possible that we are executing on a thread that doesn't have a
* message queue. In that case, the message won't appear, and code will
* be 0xFFFF. We'll give the user a chance to debug it by calling
* Break()
* Actually, that's a really bad idea since this happens a lot with threadsafe
* assertions and since it means that you can't actually run the debug build
* outside a debugger without it crashing constantly.
*/
if (( code == MBID_ENTER ) || (code == MBID_ERROR))
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
}
static const nsDebugImpl kImpl;
nsresult
nsDebugImpl::Create(nsISupports* outer, const nsIID& aIID, void* *aInstancePtr)
{
NS_ENSURE_NO_AGGREGATION(outer);
return const_cast<nsDebugImpl*>(&kImpl)->
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;
}
}
////////////////////////////////////////////////////////////////////////////////
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