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gecko-dev
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gecko-dev/xpcom/base/nsDebugImpl.cpp

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/* -*- 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 "mozilla/IntentionalCrash.h"
#include "mozilla/Printf.h"
#include "mozilla/ProfilerMarkers.h"
#include "MainThreadUtils.h"
#include "nsDebugImpl.h"
#include "nsDebug.h"
#include "nsExceptionHandler.h"
#include "nsString.h"
#include "nsXULAppAPI.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 "mozilla/StackWalk.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
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
#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::CrashWithOOM() {
NS_ABORT_OOM(-1);
return NS_OK;
}
// From toolkit/library/rust/lib.rs
extern "C" void intentional_panic(const char* message);
NS_IMETHODIMP
nsDebugImpl::RustPanic(const char* aMessage) {
intentional_panic(aMessage);
return NS_OK;
}
// From toolkit/library/rust/lib.rs
extern "C" void debug_log(const char* target, const char* message);
NS_IMETHODIMP
nsDebugImpl::RustLog(const char* aTarget, const char* aMessage) {
debug_log(aTarget, aMessage);
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(__OpenBSD__) && defined(MOZ_SANDBOX)
// no access to KERN_PROC_PID sysctl when pledge'd
return NS_OK;
#endif
#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;
}
/* static */ const char* nsDebugImpl::GetMultiprocessMode() {
return sMultiprocessDescription;
}
/**
* 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.
*/
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 final : public mozilla::PrintfTarget {
FixedBuffer() : curlen(0) { buffer[0] = '\0'; }
char buffer[764];
uint32_t curlen;
bool append(const char* sp, size_t len) override;
};
bool FixedBuffer::append(const char* aBuf, size_t aLen) {
if (!aLen) {
return true;
}
if (curlen + aLen >= sizeof(buffer)) {
aLen = sizeof(buffer) - curlen - 1;
}
if (aLen) {
memcpy(buffer + curlen, aBuf, aLen);
curlen += aLen;
buffer[curlen] = '\0';
}
return true;
}
namespace geckoprofiler::markers {
struct DebugBreakMarker {
static constexpr Span<const char> MarkerTypeName() {
return MakeStringSpan("DebugBreak");
}
static void StreamJSONMarkerData(baseprofiler::SpliceableJSONWriter& aWriter,
uint32_t aSeverity,
const ProfilerString8View& aStr,
const ProfilerString8View& aExpr,
const ProfilerString8View& aFile,
int32_t aLine) {
nsAutoCString sevString("WARNING");
switch (aSeverity) {
case NS_DEBUG_ASSERTION:
sevString = "ASSERTION";
break;
case NS_DEBUG_BREAK:
sevString = "BREAK";
break;
case NS_DEBUG_ABORT:
sevString = "ABORT";
break;
}
aWriter.StringProperty("Severity", sevString);
// The 'name' property is searchable on the front-end.
if (aStr.Length() != 0) {
aWriter.StringProperty("Message", aStr);
aWriter.StringProperty("name", aStr);
} else if (aExpr.Length() != 0) {
aWriter.StringProperty("name", aExpr);
}
if (aExpr.Length() != 0) {
aWriter.StringProperty("Expression", aExpr);
}
if (aFile.Length() != 0) {
aWriter.StringProperty("File", aFile);
}
if (aLine != 0) {
aWriter.IntProperty("Line", aLine);
}
}
static MarkerSchema MarkerTypeDisplay() {
using MS = MarkerSchema;
MS schema{MS::Location::TimelineOverview, MS::Location::MarkerChart,
MS::Location::MarkerTable};
schema.SetAllLabels("{marker.data.Severity}: {marker.data.name}");
schema.AddKeyFormat("Message", MS::Format::String);
schema.AddKeyFormat("Severity", MS::Format::String);
schema.AddKeyFormat("Expression", MS::Format::String);
schema.AddKeyFormat("File", MS::Format::String);
schema.AddKeyFormat("Line", MS::Format::Integer);
return schema;
}
};
} // namespace geckoprofiler::markers
EXPORT_XPCOM_API(void)
NS_DebugBreak(uint32_t aSeverity, const char* aStr, const char* aExpr,
const char* aFile, int32_t aLine) {
FixedBuffer nonPIDBuf;
FixedBuffer buf;
const char* sevString = "WARNING";
switch (aSeverity) {
case NS_DEBUG_ASSERTION:
sevString = "###!!! ASSERTION";
break;
case NS_DEBUG_BREAK:
sevString = "###!!! BREAK";
break;
case NS_DEBUG_ABORT:
sevString = "###!!! ABORT";
break;
default:
aSeverity = NS_DEBUG_WARNING;
}
nonPIDBuf.print("%s: ", sevString);
if (aStr) {
nonPIDBuf.print("%s: ", aStr);
}
if (aExpr) {
nonPIDBuf.print("'%s', ", aExpr);
}
if (aFile || aLine != -1) {
nonPIDBuf.print("file %s:%d", aFile ? aFile : "<unknown>",
aLine != -1 ? aLine : 0);
}
// Print "[PID]" or "[Desc PID]" at the beginning of the message.
buf.print("[");
if (sMultiprocessDescription) {
buf.print("%s ", sMultiprocessDescription);
}
bool isMainthread = (NS_IsMainThreadTLSInitialized() && NS_IsMainThread());
PRThread* currentThread = PR_GetCurrentThread();
const char* currentThreadName =
isMainthread ? "Main Thread" : PR_GetThreadName(currentThread);
if (currentThreadName) {
buf.print("%" PRIPID ", %s] %s", base::GetCurrentProcId(),
currentThreadName, nonPIDBuf.buffer);
} else {
buf.print("%" PRIPID ", Unnamed thread %p] %s", base::GetCurrentProcId(),
currentThread, nonPIDBuf.buffer);
}
// errors on platforms without a debugdlg ring a bell on stderr
#if !defined(XP_WIN)
if (aSeverity != NS_DEBUG_WARNING) {
fprintf(stderr, "\07");
}
#endif
#ifdef ANDROID
__android_log_print(ANDROID_LOG_INFO, "Gecko", "%s", buf.buffer);
#endif
PROFILER_MARKER("NS_DebugBreak", OTHER, MarkerStack::Capture(),
DebugBreakMarker, aSeverity,
ProfilerString8View::WrapNullTerminatedString(aStr),
ProfilerString8View::WrapNullTerminatedString(aExpr),
ProfilerString8View::WrapNullTerminatedString(aFile), aLine);
// 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: {
// 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_IsParentProcess()) {
// Don't include the PID in the crash report annotation to
// allow faceting on crash-stats.mozilla.org.
nsCString note("xpcom_runtime_abort(");
note += nonPIDBuf.buffer;
note += ")";
CrashReporter::AppendAppNotesToCrashReport(note);
CrashReporter::AnnotateCrashReport(
CrashReporter::Annotation::AbortMessage,
nsDependentCString(nonPIDBuf.buffer));
}
#if defined(DEBUG) && defined(_WIN32)
RealBreak();
#endif
#if defined(DEBUG)
MozWalkTheStack(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:
MozWalkTheStack(stderr);
return;
case NS_ASSERT_STACK_AND_ABORT:
MozWalkTheStack(stderr);
// Fall through to abort
[[fallthrough]];
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) {
NoteIntentionalCrash(XRE_GetProcessTypeString());
MOZ_CRASH_UNSAFE(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(__aarch64__)
asm("brk #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__) || defined(__aarch64__)
RealBreak();
#elif defined(SOLARIS)
RealBreak();
#else
# warning do not know how to break on this platform
#endif
}
nsresult nsDebugImpl::Create(const nsIID& aIID, void** aInstancePtr) {
static const nsDebugImpl* sImpl;
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) {
CrashReporter::AnnotateOOMAllocationSize(aSize);
MOZ_CRASH("OOM");
}
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