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/* -*- Mode: C++; tab-width: 2; 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 */
// This header has two implementations, the real one in nsExceptionHandler.cpp
// and a dummy in nsDummyExceptionHandler.cpp. The latter is used in builds
// configured with --disable-crashreporter. If you add or remove a function
// from this header you must update both implementations otherwise you'll break
// builds that disable the crash reporter.
#ifndef nsExceptionHandler_h__
#define nsExceptionHandler_h__
#include "mozilla/Assertions.h"
#include "mozilla/EnumeratedArray.h"
#include "mozilla/Maybe.h"
#include "CrashAnnotations.h"
#include "nsError.h"
#include "nsString.h"
#include "nsXULAppAPI.h"
#include "prio.h"
#include <stddef.h>
#include <stdint.h>
#if defined(XP_WIN)
# endif
# include <windows.h>
#if defined(XP_MACOSX)
# include <mach/mach.h>
#if defined(XP_LINUX)
# include <signal.h>
class nsIFile;
namespace CrashReporter {
using mozilla::Maybe;
using mozilla::Nothing;
#if defined(XP_WIN)
typedef HANDLE ProcessHandle;
typedef DWORD ProcessId;
typedef DWORD ThreadId;
typedef HANDLE FileHandle;
const FileHandle kInvalidFileHandle = INVALID_HANDLE_VALUE;
#elif defined(XP_MACOSX)
typedef task_t ProcessHandle;
typedef pid_t ProcessId;
typedef mach_port_t ThreadId;
typedef int FileHandle;
const FileHandle kInvalidFileHandle = -1;
typedef int ProcessHandle;
typedef pid_t ProcessId;
typedef int ThreadId;
typedef int FileHandle;
const FileHandle kInvalidFileHandle = -1;
* Returns true if the crash reporter is using the dummy implementation.
static inline bool IsDummy() {
return false;
return true;
nsresult SetExceptionHandler(nsIFile* aXREDirectory, bool force = false);
nsresult UnsetExceptionHandler();
* Tell the crash reporter to recalculate where crash events files should go.
* SetCrashEventsDir is used before XPCOM is initialized from the startup
* code.
* UpdateCrashEventsDir uses the directory service to re-set the
* crash event directory based on the current profile.
* 1. If environment variable is present, use it. We don't expect
* the environment variable except for tests and other atypical setups.
* 2. <profile>/crashes/events
* 3. <UAppData>/Crash Reports/events
void SetUserAppDataDirectory(nsIFile* aDir);
void SetProfileDirectory(nsIFile* aDir);
void UpdateCrashEventsDir();
void SetMemoryReportFile(nsIFile* aFile);
nsresult GetDefaultMemoryReportFile(nsIFile** aFile);
* Get the path where crash event files should be written.
bool GetCrashEventsDir(nsAString& aPath);
bool GetEnabled();
bool GetServerURL(nsACString& aServerURL);
nsresult SetServerURL(const nsACString& aServerURL);
bool GetMinidumpPath(nsAString& aPath);
nsresult SetMinidumpPath(const nsAString& aPath);
// These functions are thread safe and can be called in both the parent and
// child processes. Annotations added in the main process will be included in
// child process crashes too unless the child process sets its own annotations.
// If it does the child-provided annotation overrides the one set in the parent.
const bool* RegisterAnnotationBool(Annotation aKey, const bool* aData);
const uint32_t* RegisterAnnotationU32(Annotation aKey, const uint32_t* aData);
const uint64_t* RegisterAnnotationU64(Annotation aKey, const uint64_t* aData);
const size_t* RegisterAnnotationUSize(Annotation aKey, const size_t* aData);
const char* RegisterAnnotationCString(Annotation aKey, const char* aData);
const nsCString* RegisterAnnotationNSCString(Annotation aKey,
const nsCString* aData);
nsresult RecordAnnotationBool(Annotation aKey, bool aData);
nsresult RecordAnnotationU32(Annotation aKey, uint32_t aData);
nsresult RecordAnnotationU64(Annotation aKey, uint64_t aData);
nsresult RecordAnnotationUSize(Annotation aKey, size_t aData);
nsresult RecordAnnotationCString(Annotation aKey, const char* aData);
nsresult RecordAnnotationNSCString(Annotation aKey, const nsACString& aData);
nsresult RecordAnnotationNSString(Annotation aKey, const nsAString& aData);
nsresult UnrecordAnnotation(Annotation aKey);
nsresult AppendAppNotesToCrashReport(const nsACString& data);
// RAII class for setting a crash annotation during a limited scope of time.
// Will reset the named annotation to its previous value when destroyed.
// This type's behavior is identical to that of RecordAnnotation().
class MOZ_RAII AutoRecordAnnotation final {
AutoRecordAnnotation(Annotation key, bool data);
AutoRecordAnnotation(Annotation key, int data);
AutoRecordAnnotation(Annotation key, unsigned int data);
AutoRecordAnnotation(Annotation key, const nsACString& data);
Annotation mKey;
const nsCString mCurrent;
const nsCString* mPrevious;
void AnnotateOOMAllocationSize(size_t size);
void AnnotateTexturesSize(size_t size);
nsresult SetGarbageCollecting(bool collecting);
void SetEventloopNestingLevel(uint32_t level);
void SetMinidumpAnalysisAllThreads();
void ClearInactiveStateStart();
void SetInactiveStateStart();
nsresult SetRestartArgs(int argc, char** argv);
nsresult SetupExtraData(nsIFile* aAppDataDirectory, const nsACString& aBuildID);
// Registers an additional memory region to be included in the minidump
nsresult RegisterAppMemory(void* ptr, size_t length);
nsresult UnregisterAppMemory(void* ptr);
// Include heap regions of the crash context.
void SetIncludeContextHeap(bool aValue);
void GetAnnotation(ProcessId childPid, Annotation annotation,
nsACString& outStr);
// Functions for working with minidumps and .extras
typedef mozilla::EnumeratedArray<Annotation, nsCString,
void DeleteMinidumpFilesForID(
const nsAString& aId,
const Maybe<nsString>& aAdditionalMinidump = Nothing());
bool GetMinidumpForID(const nsAString& id, nsIFile** minidump,
const Maybe<nsString>& aAdditionalMinidump = Nothing());
bool GetIDFromMinidump(nsIFile* minidump, nsAString& id);
bool GetExtraFileForID(const nsAString& id, nsIFile** extraFile);
bool GetExtraFileForMinidump(nsIFile* minidump, nsIFile** extraFile);
bool WriteExtraFile(const nsAString& id, const AnnotationTable& annotations);
* Copies the non-empty annotations in the source table to the destination
* overwriting the corresponding entries.
void MergeCrashAnnotations(AnnotationTable& aDst, const AnnotationTable& aSrc);
#ifdef XP_WIN
nsresult WriteMinidumpForException(EXCEPTION_POINTERS* aExceptionInfo);
#ifdef XP_LINUX
bool WriteMinidumpForSigInfo(int signo, siginfo_t* info, void* uc);
#ifdef XP_MACOSX
nsresult AppendObjCExceptionInfoToAppNotes(void* inException);
nsresult GetSubmitReports(bool* aSubmitReport);
nsresult SetSubmitReports(bool aSubmitReport);
#ifdef XP_WIN
// This data is stored in the parent process, there is one copy for each child
// process. The mChildPid and mMinidumpFile fields are filled by the WER runtime
// exception module when the associated child process crashes.
struct WindowsErrorReportingData {
// PID of the child process that crashed.
DWORD mChildPid;
// Filename of the generated minidump; this is not a 0-terminated string
char mMinidumpFile[40];
#endif // XP_WIN
// Out-of-process crash reporter API.
// Initializes out-of-process crash reporting. This method must be called
// before the platform-specific notification pipe APIs are called. If called
// from off the main thread, this method will synchronously proxy to the main
// thread.
void OOPInit();
// Return true if a dump was found for |childPid|, and return the
// path in |dump|. The caller owns the last reference to |dump| if it
// is non-nullptr. The annotations for the crash will be stored in
// |aAnnotations|.
bool TakeMinidumpForChild(ProcessId childPid, nsIFile** dump,
AnnotationTable& aAnnotations);
* If a dump was found for |childPid| then write a minimal .extra file to
* complete it and remove it from the list of pending crash dumps. It's
* required to call this method after a non-main process crash if the crash
* report could not be finalized via the CrashReporterHost (for example because
* it wasn't instanced yet).
* @param aChildPid The pid of the crashed child process
* @param aType The type of the crashed process
* @param aDumpId A string that will be filled with the dump ID
[[nodiscard]] bool FinalizeOrphanedMinidump(ProcessId aChildPid,
GeckoProcessType aType,
nsString* aDumpId = nullptr);
// Return the current thread's ID.
// XXX: this is a somewhat out-of-place interface to expose through
// crashreporter, but it takes significant work to call sys_gettid()
// correctly on Linux and breakpad has already jumped through those
// hoops for us.
ThreadId CurrentThreadId();
* Take a minidump of the target process and pair it with a new minidump of the
* calling process and thread. The caller will own both dumps after this call.
* If this function fails it will attempt to delete any files that were created.
* The .extra information created will not include an 'additional_minidumps'
* annotation.
* @param aTargetPid The target process for the minidump.
* @param aTargetBlamedThread The target thread for the minidump.
* @param aIncomingPairName The name to apply to the paired dump the caller
* passes in.
* @param aTargetDumpOut The target minidump file paired up with the new one.
* @param aTargetAnnotations The crash annotations of the target process.
* @return bool indicating success or failure
bool CreateMinidumpsAndPair(ProcessHandle aTargetPid,
ThreadId aTargetBlamedThread,
const nsACString& aIncomingPairName,
AnnotationTable& aTargetAnnotations,
nsIFile** aTargetDumpOut);
#if defined(XP_WIN) || defined(XP_MACOSX)
// Parent-side API for children
const char* GetChildNotificationPipe();
// Parent-side API for children
// Set the outparams for crash reporter server's fd (|childCrashFd|)
// and the magic fd number it should be remapped to
// (|childCrashRemapFd|) before exec() in the child process.
// |SetRemoteExceptionHandler()| in the child process expects to find
// the server at |childCrashRemapFd|. Return true if successful.
// If crash reporting is disabled, both outparams will be set to -1
// and |true| will be returned.
bool CreateNotificationPipeForChild(int* childCrashFd, int* childCrashRemapFd);
#endif // XP_WIN
// Child-side API
bool SetRemoteExceptionHandler(const char* aCrashPipe = nullptr);
bool UnsetRemoteExceptionHandler(bool wasSet = true);
// Android creates child process as services so we must explicitly set
// the handle for the pipe since it can't get remapped to a default value.
void SetNotificationPipeForChild(FileHandle childCrashFd);
} // namespace CrashReporter
#endif /* nsExceptionHandler_h__ */