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#include "debughelper.h"
#include "mostQtHeaders.h"
#include "smallUsefulFunctions.h"
#include <stdio.h>
#include <stdlib.h>
#ifndef NO_CRASH_HANDLER
#if (defined(x86_64) || defined(__x86_64__))
#define CPU_IS_X86_64
#elif (defined(ppc) || defined(__ppc__) || defined(__powerpc__) || defined(__POWERPC__) || defined(PPC) || defined(__PPC) || defined(_ARCH_PPC))
#define CPU_IS_PPC
#elif (defined(ppc64) || defined(__ppc64__) || defined(__powerpc64__) || defined(__POWERPC64__) || defined(PPC64))
#define CPU_IS_PPC
#elif (defined(arm) || defined(__arm__))
#define CPU_IS_ARM
#elif (defined(ia64) || defined(__ia64__))
#define CPU_IS_IA64
#elif (defined(mips) || defined(__mips__) || defined(mipsel) || defined(__mipsel__))
#define CPU_IS_MIPS
#elif (defined(sparc) || defined(__sparc__))
#define CPU_IS_SPARC32
#elif (defined(s390x) || defined(__s390x__))
#define CPU_IS_S390_64
#elif (defined(s390) || defined(__s390__) )
#define CPU_IS_S390_31
#else
#define CPU_IS_X86_32
#endif
#if (defined(__unix__) || defined(unix) || defined(__linux__) || defined(linux) || defined(__gnu_hurd__) || defined(__FreeBSD__) || defined(__FreeBSD_kernel__))
#define OS_IS_LINUX_LIKE
#endif
#if (defined(OS_IS_LINUX_LIKE) || defined(Q_OS_MAC))
#define OS_IS_UNIX_LIKE
#endif
//===========================Abstract CPU model==========================
//platfom independent implementation of assembler instructions
//(use case: before changing eip, the old eip must be pushed in the correct way on the stack, otherwise the
// backtrace doesn't show the function that actually crashed)
struct SimulatedCPU {
char *pc; //e.g. eip, r15
char *frame; //e.g. ebp, r11
char *stack; //e.g. esp, r13
#if defined(CPU_IS_ARM) || defined(CPU_IS_MIPS) || defined(CPU_IS_PPC) || defined(CPU_IS_SPARC32)
char *returnTo; //lr/r14
#endif
inline void push(char *value)
{
stack -= sizeof(void *);
*(char **)(stack) = value;
}
inline char *pop()
{
char *temp = *(char **)(stack);
stack += sizeof(void *);
return temp;
}
inline void jmp(char *value)
{
pc = value;
}
inline void call(char *value);
inline void ret();
inline void enter(int size);
inline void leave();
void set_all(void *context);
void get_all(void *context);
void set_from_real();
bool stackWalk();
void unwindStack()
{
SimulatedCPU temp = *this;
int frames = 0;
while (temp.stackWalk()) frames++;
if (frames == 0) return;
if (frames < 100) frames = frames - 10;
else frames = frames - 100;
while (frames > 0) {
this->leave();
frames--;
}
}
int backtrace(void **array, int size)
{
if (!pc || !frame) return 0;
for (int i = 0; i < size; i++)
array[i] = 0;
int i = 0;
do {
array[i] = pc;
i++;
} while (stackWalk() && i < size);
return i;
}
};
#ifdef CPU_CONTEXT_TYPE
#undef CPU_CONTEXT_TYPE
#endif
#ifdef RETURNTO_FROM_UCONTEXT
#undef RETURNTO_FROM_UCONTEXT
#endif
//===========================CRASH HANDLER HEADER==============================
#ifdef OS_IS_UNIX_LIKE
#include "signal.h"
#include "unistd.h"
#include "sys/wait.h"
#define SAFE_INT volatile sig_atomic_t
#else
#define SAFE_INT int
#endif
SAFE_INT crashHandlerType = 1;
enum { ERR_NONE = 0, ERR_SIGNAL, ERR_ASSERT, ERR_LOOP, ERR_EXCEPTION};
SAFE_INT lastErrorType = 0;
volatile void *sigSegvRecoverReturnAddress = 0; //address where it should jump to, if recovering causes another sigsegv
#define CRASH_HANDLER_RECOVER 1
#define CRASH_HANDLER_PRINT_BACKTRACE_IN_HANDLER 2
#define CRASH_HANDLER_LOOP_GUARDIAN_DISABLED 4
#define CRASH_HANDLER_USE_NATIVE_BACKTRACE 8
//===========================STACK TRACE PRINTING=========================
#ifdef Q_OS_WIN32
#include <QSysInfo>
#include "windows.h"
#include <QMutex>
//from wine
//dbghelp.h
typedef BOOL WINAPI (*SymInitializeFunc)(HANDLE, PCSTR, BOOL);
typedef PVOID WINAPI (*SymFunctionTableAccess64Func)(HANDLE, DWORD64);
typedef DWORD64 WINAPI (*SymGetModuleBase64Func)(HANDLE, DWORD64);
typedef enum {
AddrMode1616,
AddrMode1632,
AddrModeReal,
AddrModeFlat
} ADDRESS_MODE;
//
// New KDHELP structure for 64 bit system support.
// This structure is preferred in new code.
//
typedef struct _KDHELP64 {
//
// address of kernel thread object, as provided in the
// WAIT_STATE_CHANGE packet.
//
DWORD64 Thread;
//
// offset in thread object to pointer to the current callback frame
// in kernel stack.
//
DWORD ThCallbackStack;
//
// offset in thread object to pointer to the current callback backing
// store frame in kernel stack.
//
DWORD ThCallbackBStore;
//
// offsets to values in frame:
//
// address of next callback frame
DWORD NextCallback;
// address of saved frame pointer (if applicable)
DWORD FramePointer;
//
// Address of the kernel function that calls out to user mode
//
DWORD64 KiCallUserMode;
//
// Address of the user mode dispatcher function
//
DWORD64 KeUserCallbackDispatcher;
//
// Lowest kernel mode address
//
DWORD64 SystemRangeStart;
DWORD64 Reserved[8];
} KDHELP64, *PKDHELP64;
typedef struct _tagADDRESS64 {
DWORD64 Offset;
WORD Segment;
ADDRESS_MODE Mode;
} ADDRESS64, *LPADDRESS64;
typedef struct _STACKFRAME64 {
ADDRESS64 AddrPC;
ADDRESS64 AddrReturn;
ADDRESS64 AddrFrame;
ADDRESS64 AddrStack;
ADDRESS64 AddrBStore;
PVOID FuncTableEntry;
DWORD64 Params[4];
BOOL Far;
BOOL Virtual;
DWORD64 Reserved[3];
KDHELP64 KdHelp;
} STACKFRAME64, *LPSTACKFRAME64;
typedef BOOL (CALLBACK *PREAD_PROCESS_MEMORY_ROUTINE64)(HANDLE, DWORD64, PVOID, DWORD, PDWORD);
typedef PVOID (CALLBACK *PFUNCTION_TABLE_ACCESS_ROUTINE64)(HANDLE, DWORD64);
typedef DWORD64 (CALLBACK *PGET_MODULE_BASE_ROUTINE64)(HANDLE, DWORD64);
typedef DWORD64 (CALLBACK *PTRANSLATE_ADDRESS_ROUTINE64)(HANDLE, HANDLE, LPADDRESS64);
typedef BOOL WINAPI (*StackWalk64Func)(DWORD, HANDLE, HANDLE, LPSTACKFRAME64, PVOID,
PREAD_PROCESS_MEMORY_ROUTINE64,
PFUNCTION_TABLE_ACCESS_ROUTINE64,
PGET_MODULE_BASE_ROUTINE64,
PTRANSLATE_ADDRESS_ROUTINE64);
typedef struct _IMAGEHLP_SYMBOL64 {
DWORD SizeOfStruct;
DWORD64 Address;
DWORD Size;
DWORD Flags;
DWORD MaxNameLength;
CHAR Name[1];
} IMAGEHLP_SYMBOL64, *PIMAGEHLP_SYMBOL64;
typedef struct _IMAGEHLP_LINE64 {
DWORD SizeOfStruct;
PVOID Key;
DWORD LineNumber;
PCHAR FileName;
DWORD64 Address;
} IMAGEHLP_LINE64, *PIMAGEHLP_LINE64;
typedef BOOL WINAPI (*SymGetSymFromAddr64Func)(HANDLE, DWORD64, PDWORD64, PIMAGEHLP_SYMBOL64);
typedef BOOL WINAPI (*SymGetLineFromAddr64Func)(HANDLE, DWORD64, PDWORD, PIMAGEHLP_LINE64);
#define CPU_CONTEXT_TYPE CONTEXT
#define LOAD_FUNCTION(name, ansiname) static name##Func name = (name##Func)GetProcAddress(dbghelp, ansiname);
#define LOAD_FUNCTIONREQRET(name, ansiname, result) LOAD_FUNCTION(name,ansiname) if (!name) return result;
HMODULE dbghelp = 0;
bool loadDbgHelp()
{
if (dbghelp != 0) return true;
dbghelp = LoadLibraryA("dbghelp.dll");
return dbghelp;
}
bool initDebugHelp()
{
if (dbghelp != 0) return true; //don't call syminitialize twice
if (!loadDbgHelp()) return false;
LOAD_FUNCTIONREQRET(SymInitialize, "SymInitialize", false);
if (!(*SymInitialize)(((QSysInfo::windowsVersion() & QSysInfo::WV_DOS_based) == 0) ? GetCurrentProcess() : (HANDLE)GetCurrentProcessId(), 0, true))
return false;
return true;
}
QStringList backtrace_symbols_win(void **addr, int size)
{
if (!initDebugHelp()) {
if (dbghelp) return QStringList(QString("Failed to initialize SymInitialize ") + QString::number(GetLastError()));
else return QStringList("Failed to load dbghelp");
}
LOAD_FUNCTIONREQRET(SymGetSymFromAddr64, "SymGetSymFromAddr64", QStringList("Failed to load SymGetSymFromAddr64"));
LOAD_FUNCTION(SymGetLineFromAddr64, "SymGetLineFromAddr64");
HANDLE process = GetCurrentProcess();
_IMAGEHLP_SYMBOL64 *symbol = (_IMAGEHLP_SYMBOL64 *)malloc(sizeof(_IMAGEHLP_SYMBOL64) + 256);
QStringList res;
for (int i = 0; i < size; i++) {
DWORD64 displacement = 0;
DWORD displacement32 = 0;
ZeroMemory(symbol, sizeof(_IMAGEHLP_SYMBOL64));
symbol->SizeOfStruct = sizeof(_IMAGEHLP_SYMBOL64);
symbol->MaxNameLength = 256;
_IMAGEHLP_LINE64 line;
QString cur;
if ((*SymGetSymFromAddr64)(process, (DWORD64)addr[i], &displacement, symbol))
cur = QString::fromLocal8Bit(symbol->Name) + "+" + QString::number(displacement);
else
cur = "??? error: " + QString::number(GetLastError());
if (SymGetLineFromAddr64) {
if ((*SymGetLineFromAddr64)(process, (DWORD64)addr[i], &displacement32, &line))
cur += " in " + QString::fromLocal8Bit(line.FileName) + ":" + QString::number(line.LineNumber);
}
res << cur;
}
return res;
}
QMutex backtraceMutex;
//from http://jpassing.com/2008/03/12/walking-the-stack-of-the-current-thread/
// http://www.codeproject.com/Articles/11132/Walking-the-callstack
//alternative: __builtin_return_address, but it is said to not work so well
int backtrace(void **trace, int size)
{
if (!backtraceMutex.tryLock()) return 0;
//init crap
HANDLE process = GetCurrentProcess();
HANDLE thread = GetCurrentThread();
if (!initDebugHelp()) return 0; //do not unlock, no need to try it again, if the initialization fails
CONTEXT context;
ZeroMemory( &context, sizeof( CONTEXT ) );
STACKFRAME64 stackFrame;
#if (defined(x86_64) || defined(__x86_64__))
RtlCaptureContext( &context );
#else
// Those three registers are enough.
geteip:
context.Eip = (DWORD) && geteip;
__asm__(
"mov %%ebp, %0\n"
"mov %%esp, %1"
: "=r"(context.Ebp), "=r"(context.Esp));
#endif
ZeroMemory( &stackFrame, sizeof( stackFrame ) );
#ifdef CPU_IS_64
DWORD machineType = IMAGE_FILE_MACHINE_AMD64;
stackFrame.AddrPC.Offset = context.Rip;
stackFrame.AddrPC.Mode = AddrModeFlat;
stackFrame.AddrFrame.Offset = context.Rbp;//changed from rsp. correctly?
stackFrame.AddrFrame.Mode = AddrModeFlat;
stackFrame.AddrStack.Offset = context.Rsp;
stackFrame.AddrStack.Mode = AddrModeFlat;
#else
DWORD machineType = IMAGE_FILE_MACHINE_I386;
stackFrame.AddrPC.Offset = context.Eip;
stackFrame.AddrPC.Mode = AddrModeFlat;
stackFrame.AddrFrame.Offset = context.Ebp;
stackFrame.AddrFrame.Mode = AddrModeFlat;
stackFrame.AddrStack.Offset = context.Esp;
stackFrame.AddrStack.Mode = AddrModeFlat;
/* #elif _M_IA64
MachineType = IMAGE_FILE_MACHINE_IA64;
StackFrame.AddrPC.Offset = Context.StIIP;
StackFrame.AddrPC.Mode = AddrModeFlat;
StackFrame.AddrFrame.Offset = Context.IntSp;
StackFrame.AddrFrame.Mode = AddrModeFlat;
StackFrame.AddrBStore.Offset= Context.RsBSP;
StackFrame.AddrBStore.Mode = AddrModeFlat;
StackFrame.AddrStack.Offset = Context.IntSp;
StackFrame.AddrStack.Mode = AddrModeFlat;
#else
#error "Unsupported platform"*/
#endif
static HMODULE dbghelp = LoadLibraryA("dbghelp.dll");
if (!dbghelp) return 0;
LOAD_FUNCTIONREQRET(StackWalk64, "StackWalk64", 0);
LOAD_FUNCTIONREQRET(SymGetModuleBase64, "SymGetModuleBase64", 0);
LOAD_FUNCTIONREQRET(SymFunctionTableAccess64, "SymFunctionTableAccess64", 0);
//get stackframes
QList<DWORD64> stackFrames;
int idx = 0;
while (idx < size && (*StackWalk64)(machineType, process, thread, &stackFrame, &context, 0, SymFunctionTableAccess64, SymGetModuleBase64, 0)) {
trace[idx] = reinterpret_cast<void *>(stackFrame.AddrPC.Offset);
idx++;
}
backtraceMutex.unlock();
return idx;
}
QString temporaryFileNameFormat()
{
return QDir::tempPath() + QString("/texstudio_backtrace%1.txt");
}
#else
#include "execinfo.h"
QString temporaryFileNameFormat()
{
return "/tmp/texstudio_backtrace%1.txt";
}
QStringList backtrace_symbols_win(void **, int)
{
return QStringList();
}
#endif
QString print_backtrace(const SimulatedCPU &state, const QString &message)
{
#ifdef Q_OS_WIN32
qDebug("%s", qPrintable(message));
#define PRINT(...) do { qDebug(__VA_ARGS__); if (logFile) fprintf(logFile, __VA_ARGS__); } while (0)
#else
fprintf(stderr, "%s\n", qPrintable(message));
qDebug("%s", qPrintable(message));
#define PRINT(...) do { fprintf(stderr, __VA_ARGS__); qDebug(__VA_ARGS__); if (logFile) fprintf(logFile, __VA_ARGS__); } while (0)
#endif
static int count = 0;
count++;
QString backtraceFilename = temporaryFileNameFormat().arg(count);
FILE *logFile = fopen(qPrintable(backtraceFilename), "w");
PRINT("%s\n", qPrintable(message));
void *trace[48];
SimulatedCPU copystate = state;
int size;
#if defined(CPU_IS_MIPS) || defined(CPU_IS_IA64) || defined(CPU_IS_SPARC32) || defined(CPU_IS_S390_31) || defined(CPU_IS_390_64)
bool useNativeBacktrace = true //always use standard backtrace on exotic architectures
#else
bool useNativeBacktrace = (crashHandlerType & CRASH_HANDLER_USE_NATIVE_BACKTRACE);
#endif
if (useNativeBacktrace) size = backtrace(trace, 48);
else size = copystate.backtrace(trace, 48);
#ifdef Q_OS_WIN32
QStringList additionalMessages = backtrace_symbols_win(trace, size);
char **messages = 0;
#else
QStringList additionalMessages;
char **messages = backtrace_symbols(trace, size);
#endif
for (int i = 0; i < size; ++i) {
const char *message = messages ? messages[i] : "";
if (i >= additionalMessages.size()) PRINT("[bt] %s\n", message);
else PRINT("[bt] %p %s %s\n", trace[i], message, qPrintable(additionalMessages[i]));
}
if (logFile) fclose(logFile);
return backtraceFilename;
}
QString print_backtrace(const QString &message)
{
SimulatedCPU cpu;
cpu.set_from_real();
return print_backtrace(cpu, message);
}
//=========================POSIX SIGNAL HANDLER===========================
#ifdef OS_IS_LINUX_LIKE
#include "signal.h"
#include "ucontext.h"
#include "sys/ucontext.h"
#include "pthread.h"
#define USE_SIGNAL_HANDLER
#ifdef CPU_IS_X86_64
#if defined(__FreeBSD__)
#define PC_FROM_UCONTEXT(context) (context)->uc_mcontext.mc_rip
#define STACK_FROM_UCONTEXT(context) (context)->uc_mcontext.mc_rsp
#define FRAME_FROM_UCONTEXT(context) (context)->uc_mcontext.mc_rbp
#else
#define PC_FROM_UCONTEXT(context) (context)->uc_mcontext.gregs[REG_RIP]
#define STACK_FROM_UCONTEXT(context) (context)->uc_mcontext.gregs[REG_RSP]
#define FRAME_FROM_UCONTEXT(context) (context)->uc_mcontext.gregs[REG_RBP]
#endif
#elif defined(CPU_IS_X86_32)
#if defined(__FreeBSD__)
#define PC_FROM_UCONTEXT(context) (context)->uc_mcontext.mc_eip
#define STACK_FROM_UCONTEXT(context) (context)->uc_mcontext.mc_esp
#define FRAME_FROM_UCONTEXT(context) (context)->uc_mcontext.mc_ebp
#else
#define PC_FROM_UCONTEXT(context) (context)->uc_mcontext.gregs[REG_EIP]
#define STACK_FROM_UCONTEXT(context) (context)->uc_mcontext.gregs[REG_ESP]
#define FRAME_FROM_UCONTEXT(context) (context)->uc_mcontext.gregs[REG_EBP]
#endif
#elif defined(CPU_IS_PPC)
#define PC_FROM_UCONTEXT(context) (context)->uc_mcontext.gp_regs[32]
#define STACK_FROM_UCONTEXT(context) (context)->uc_mcontext.gp_regs[1]
#define FRAME_FROM_UCONTEXT(context) (context)->uc_mcontext.gp_regs[31] //not always used
#define RETURNTO_FROM_UCONTEXT(context) (context)->uc_mcontext.gp_regs[34]
#elif defined(CPU_IS_ARM)
/*
#define PC_FROM_UCONTEXT(context) (context)->uc_mcontext.arm_pc
#define STACK_FROM_UCONTEXT(context) (context)->uc_mcontext.arm_sp
#define FRAME_FROM_UCONTEXT(context) (context)->uc_mcontext.arm_fp
#define RETURNTO_FROM_UCONTEXT(context) (context)->uc_mcontext.arm_lr
*/
#define PC_FROM_UCONTEXT(context) (context)->uc_mcontext.__gregs[_REG_R15]
#define STACK_FROM_UCONTEXT(context) (context)->uc_mcontext.__gregs[_REG_R13]
#define FRAME_FROM_UCONTEXT(context) (context)->uc_mcontext.__gregs[_REG_R11]
#define RETURNTO_FROM_UCONTEXT(context) (context)->uc_mcontext.__gregs[_REG_R14]
#elif defined(CPU_IS_IA64)
#define PC_FROM_UCONTEXT(context) (context)->_u._mc.sc_ip
#define STACK_FROM_UCONTEXT(context) (context)->_u._mc.sc_gr[12] //is that register 12?
#define FRAME_FROM_UCONTEXT(context) (context)->_u._mc.sc_cfm //does not really make sense
#elif defined(CPU_IS_MIPS)
#define PC_FROM_UCONTEXT(context) (context)->uc_mcontext.pc
#define STACK_FROM_UCONTEXT(context) (context)->uc_mcontext.sc_regs[29]
#define FRAME_FROM_UCONTEXT(context) (context)->uc_mcontext.sc_regs[30]
#define RETURNTO_FROM_UCONTEXT(context) (context)->uc_mcontext.sc_regs[31]
#elif defined(CPU_IS_SPARC32)
#define PC_FROM_UCONTEXT(context) (context)->uc_mcontext.gregs[REG_nPC]
#define STACK_FROM_UCONTEXT(context) (context)->uc_mcontext.gregs[REG_O6]
//todo: gwins-> might be 0. (first or last (context)->uc_mcontext.gwins[0].wbcnt-1 window?)
#define FRAME_FROM_UCONTEXT(context) (context)->uc_mcontext.gwins->wbuf[0].rw_in[6]
#define RETURNTO_FROM_UCONTEXT(context) (context)->uc_mcontext.gwins->wbuf[0].rw_in[7]
#elif defined(CPU_IS_S390_31) || defined(CPU_IS_S390_64)
#define PC_FROM_UCONTEXT(context) (context)->uc_mcontext.psw.addr
#define STACK_FROM_UCONTEXT(context) (context)->uc_mcontext.gregs[15]
#define FRAME_FROM_UCONTEXT(context) (context)->uc_mcontext.gregs[11]
//#define RETURNTO_FROM_UCONTEXT(context) (context)->uc_mcontext.gregs[14]
#else
#error Unknown cpu architecture
#endif
#define SIGMYHANG SIGRTMIN + 4 //signal send to the main thread, if the guardian detects an endless loop
#define SIGMYHANG_CONTINUE SIGRTMIN + 5 //signal send to the main thread, if the endless loop should be continued
#endif
#ifdef Q_OS_MAC
#include "signal.h"
//#include "ucontext.h"
#include "sys/signal.h"
#include "sys/ucontext.h"
#include "pthread.h"
#define USE_SIGNAL_HANDLER
//names from http://google-glog.googlecode.com/svn-history/r75/trunk/m4/pc_from_ucontext.m4
//for mac <= 10.4/tiger: if __ss.__ doesn't compile, replace it by ss.
#if defined(__DARWIN_UNIX03) && defined(_STRUCT_X86_EXCEPTION_STATE32)
#define MAC_CONTEXT_PREFIXED(x) __##x
#else
#define MAC_CONTEXT_PREFIXED(x) x
#endif
// >= mac 10.5
#ifdef CPU_IS_X86_64
#define PC_FROM_UCONTEXT(context) context->uc_mcontext->MAC_CONTEXT_PREFIXED(ss).MAC_CONTEXT_PREFIXED(rip)
#define STACK_FROM_UCONTEXT(context) context->uc_mcontext->MAC_CONTEXT_PREFIXED(ss).MAC_CONTEXT_PREFIXED(rsp)
#define FRAME_FROM_UCONTEXT(context) context->uc_mcontext->MAC_CONTEXT_PREFIXED(ss).MAC_CONTEXT_PREFIXED(rbp)
#elif defined(CPU_IS_PPC)
#define PC_FROM_UCONTEXT(context) context->uc_mcontext->MAC_CONTEXT_PREFIXED(ss).__srr0
#error need ppc stack register name
#elif defined(CPU_IS_X86_32)
#define PC_FROM_UCONTEXT(context) context->uc_mcontext->MAC_CONTEXT_PREFIXED(ss).MAC_CONTEXT_PREFIXED(eip)
#define STACK_FROM_UCONTEXT(context) context->uc_mcontext->MAC_CONTEXT_PREFIXED(ss).MAC_CONTEXT_PREFIXED(esp)
#define FRAME_FROM_UCONTEXT(context) context->uc_mcontext->MAC_CONTEXT_PREFIXED(ss).MAC_CONTEXT_PREFIXED(ebp)
#else
#error Unsupported processor architecture
#endif
#define SIGMYHANG SIGUSR1 //signal send to the main thread, if the guardian detects an endless loop
#define SIGMYHANG_CONTINUE SIGUSR2 //signal send to the main thread, if the endless loop should be continued
#endif
#ifdef USE_SIGNAL_HANDLER
#define CPU_CONTEXT_TYPE ucontext_t
volatile sig_atomic_t lastCrashSignal = 0;
#define SIGMYSTACKSEGV 123
#define LAST_POSSIBLE_TXS_ADDRESS ( ( (char*)&isAddressInTeXstudio) + 0x900000 )
//do not use etext, since it behaves funny (e.g. becomes 0 when including sys/ptrace)
//#define LAST_POSSIBLE_TXS_ADDRESS (&_etext)
CPU_CONTEXT_TYPE lastLoopContext;
bool isAddressInTeXstudio(void *address)
{
return address < LAST_POSSIBLE_TXS_ADDRESS;
}
inline quintptr ptrdistance(void *a, void *b)
{
if (a < b) return (quintptr)(b) - (quintptr)(a);
else return (quintptr)(a) - (quintptr)(b);
}
const char *signalIdToName(int id)
{
switch (id) {
case SIGSEGV:
return ("SIGSEGV");
case SIGFPE:
return ("SIGFPE");
case SIGMYSTACKSEGV:
return ("SIGSEGV on stack");
//case SIGMYHANG: return "Endless loop";
default:
if (id == SIGMYHANG) return "Endless loop";
else return ("SIG???");
}
}
void signalHandler(int type, siginfo_t *si, void *ccontext)
{
lastErrorType = ERR_SIGNAL;
SimulatedCPU cpu;
if (ccontext) {
cpu.set_all(ccontext);
if (cpu.frame == 0) cpu.frame = cpu.stack;
if (type == SIGSEGV && sigSegvRecoverReturnAddress) {
cpu.jmp((char *)sigSegvRecoverReturnAddress);
sigSegvRecoverReturnAddress = 0;
cpu.get_all(ccontext);
return;
}
char *addr = (char *)(si->si_addr);
char *minstack = cpu.stack < cpu.frame ? cpu.stack : cpu.frame;
if (type == SIGSEGV && ptrdistance(addr, minstack) < 1024) type = SIGMYSTACKSEGV;
}
if (crashHandlerType & CRASH_HANDLER_PRINT_BACKTRACE_IN_HANDLER || !ccontext) {
print_backtrace(signalIdToName(type));
if (!ccontext) return;
}
if (crashHandlerType & CRASH_HANDLER_RECOVER) {
if (type == SIGMYHANG) {
if (!isAddressInTeXstudio(cpu.pc)) return; //don't mess with library functions
lastLoopContext = *(static_cast<CPU_CONTEXT_TYPE *>(ccontext));
lastErrorType = ERR_LOOP;
} else if (type == SIGMYSTACKSEGV) cpu.unwindStack();
lastCrashSignal = type;
cpu.call((char *)(&recover));
cpu.get_all(ccontext);
}
}
void signalHandlerContinueHanging(int, siginfo_t *, void *ccontext)
{
*(static_cast<CPU_CONTEXT_TYPE *>(ccontext)) = lastLoopContext;
}
const int SIGNAL_STACK_SIZE = 256 * 1024;
char staticSignalStack[SIGNAL_STACK_SIZE];
pthread_t mainThreadID;
void registerCrashHandler(int mode)
{
if (mode >= 0) {
stack_t ss;
ss.ss_sp = staticSignalStack;
ss.ss_size = SIGNAL_STACK_SIZE;
ss.ss_flags = 0;
sigaltstack(&ss, 0);
struct sigaction sa;
memset(&sa, 0, sizeof(sa));
sa.sa_flags = SA_SIGINFO | SA_ONSTACK;
sa.sa_sigaction = &signalHandler;
sigaction(SIGSEGV, &sa, 0);
sa.sa_sigaction = &signalHandler;
sigaction(SIGFPE, &sa, 0);
if (!(mode & CRASH_HANDLER_LOOP_GUARDIAN_DISABLED)) {
sa.sa_sigaction = &signalHandler;
sigaction(SIGMYHANG, &sa, 0);
sa.sa_sigaction = &signalHandlerContinueHanging;
sigaction(SIGMYHANG_CONTINUE, &sa, 0);
mainThreadID = pthread_self();
}
}
}
QString getLastCrashInformationInternal()
{
return signalIdToName(lastCrashSignal);
}
bool recoverMainThreadFromOutside()
{
//fprintf(stderr, "%i -> %lx",SIGMYHANG, mainThreadID);
lastErrorType = ERR_NONE;
lastCrashSignal = 0;
if (pthread_kill(mainThreadID, SIGMYHANG) != 0) return false;
int loopend = 1000000;
while ( !lastCrashSignal && (--loopend >= 0) ) ;
__sync_synchronize(); //memory barrier (does it work?) (better have a barrier here, than a lock in the signal handler)
return lastErrorType == ERR_LOOP;
}
void undoMainThreadRecoveringFromOutside()
{
pthread_kill(mainThreadID, SIGMYHANG_CONTINUE);
}
#endif
//=========================WINDOWS EXCEPTION HANDLER===========================
#ifdef Q_OS_WIN32
void *maxStack = 0;
#if 0
void printStackInfo()
{
SYSTEM_INFO si;
MEMORY_BASIC_INFORMATION mi, info;
GetSystemInfo(&si);
for (int i = -2; i <= 32; i++) {
bool allocated = VirtualQuery((char *)maxStack + i * si.dwPageSize, &info, sizeof(info));
fprintf(stderr, "> %i: base: %p, allocbase: %p, size: %x, allocprotect: %x, protect: %x, state: %x\n",
allocated, info.BaseAddress, info.AllocationBase, info.RegionSize, info.AllocationProtect, info.Protect, info.State);
}
}
#endif
void myresetstkoflw()
{
if (!maxStack) return;
SYSTEM_INFO si;
GetSystemInfo(&si);
MEMORY_BASIC_INFORMATION info;
if (VirtualQuery(maxStack, &info, sizeof(info)) != sizeof(info)) return;
//int pagesToFree = 16;
// allocated = VirtualFree(info.AllocationBase, pagesToFree * si.dwPageSize, MEM_DECOMMIT);
//VirtualProtect((char*)info.AllocationBase + si.dwPageSize, si.dwPageSize, PAGE_NOACCESS, &tempi);
//VirtualFree((char*)info.AllocationBase + si.dwPageSize, si.dwPageSize, MEM_DECOMMIT);
//VirtualProtect((char*)info.AllocationBase + 2*si.dwPageSize, si.dwPageSize, PAGE_GUARD | PAGE_READWRITE, &tempi);
DWORD tempi;
//Just put that guard page back, where it was.
VirtualProtect((char *)info.BaseAddress, si.dwPageSize, PAGE_GUARD | PAGE_READWRITE, &tempi);
//printStackInfo();
}
void recoverWithStackGuardianPage()
{
myresetstkoflw();
//typedef int (*ResetstkoflwFunc) ();
//ResetstkoflwFunc resetstkoflw = (ResetstkoflwFunc)(GetProcAddress(LoadLibraryA("msvcr70.dll"), "_resetstkoflw"));
//if (resetstkoflw) (*resetstkoflw)();
recover();
}
#define CATCHED_EXCEPTIONS(X) \
X(EXCEPTION_ACCESS_VIOLATION) X(EXCEPTION_ARRAY_BOUNDS_EXCEEDED) X(EXCEPTION_DATATYPE_MISALIGNMENT) \
X(EXCEPTION_FLT_DENORMAL_OPERAND) X(EXCEPTION_FLT_DIVIDE_BY_ZERO) X(EXCEPTION_FLT_INEXACT_RESULT) \
X(EXCEPTION_FLT_INVALID_OPERATION) X(EXCEPTION_FLT_OVERFLOW) X(EXCEPTION_FLT_UNDERFLOW) \
X(EXCEPTION_IN_PAGE_ERROR) \
X(EXCEPTION_INT_DIVIDE_BY_ZERO) X(EXCEPTION_INT_OVERFLOW) \
X(EXCEPTION_INVALID_DISPOSITION) \
X(EXCEPTION_FLT_STACK_CHECK) X(EXCEPTION_STACK_OVERFLOW)
//EXCEPTION_ILLEGAL_INSTRUCTION
//EXCEPTION_NONCONTINUABLE_EXCEPTION
//EXCEPTION_PRIV_INSTRUCTION
#ifdef CPU_IS_X86_64
#define PC_FROM_UCONTEXT(context) (context)->Rip
#define FRAME_FROM_UCONTEXT(context) (context)->Rbp
#define STACK_FROM_UCONTEXT(context) (context)->Rsp
#elif defined(CPU_IS_X86_32)
#define PC_FROM_UCONTEXT(context) (context)->Eip
#define FRAME_FROM_UCONTEXT(context) (context)->Ebp
#define STACK_FROM_UCONTEXT(context) (context)->Esp
#else
#error Unsupported processor architecture
#endif
const char *exceptionCodeToName(int code)
{
switch (code) {
#define X(t) case t: return #t;
CATCHED_EXCEPTIONS(X)
#undef X
}
return "unknown";
}
int lastExceptionCode = 0;
quintptr lastExceptionAddress = 0;
LONG WINAPI crashHandler(_EXCEPTION_POINTERS *ExceptionInfo)
{
if (!ExceptionInfo) return EXCEPTION_CONTINUE_SEARCH;
bool isCatched = false;
#define X(t) if (ExceptionInfo->ExceptionRecord->ExceptionCode == t) isCatched = true;
CATCHED_EXCEPTIONS(X)
#undef X
if (!isCatched) return EXCEPTION_CONTINUE_SEARCH;
if ((ExceptionInfo->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION || ExceptionInfo->ExceptionRecord->ExceptionCode == EXCEPTION_STACK_OVERFLOW)
&& sigSegvRecoverReturnAddress) {
SimulatedCPU cpu;
cpu.set_all(ExceptionInfo->ContextRecord);
cpu.jmp((char *)sigSegvRecoverReturnAddress);
sigSegvRecoverReturnAddress = 0;
cpu.get_all(ExceptionInfo->ContextRecord);
return EXCEPTION_CONTINUE_EXECUTION;
}
//if (ExceptionInfo->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION) print_backtrace("");
lastErrorType = ERR_SIGNAL;
if (crashHandlerType & CRASH_HANDLER_PRINT_BACKTRACE_IN_HANDLER) {
print_backtrace(exceptionCodeToName(ExceptionInfo->ExceptionRecord->ExceptionCode));
}
if (crashHandlerType & CRASH_HANDLER_RECOVER) {
lastExceptionCode = ExceptionInfo->ExceptionRecord->ExceptionCode;
SimulatedCPU cpu;
cpu.set_all(ExceptionInfo->ContextRecord);
lastExceptionAddress = (quintptr)(cpu.pc);
if (ExceptionInfo->ExceptionRecord->ExceptionCode == EXCEPTION_STACK_OVERFLOW || ExceptionInfo->ExceptionRecord->ExceptionCode == EXCEPTION_FLT_STACK_CHECK) {
maxStack = cpu.stack;
cpu.unwindStack();
cpu.call((char *)&recoverWithStackGuardianPage);
} else {
cpu.call((char *)&recover);
}
cpu.get_all(ExceptionInfo->ContextRecord);
return EXCEPTION_CONTINUE_EXECUTION;
}
return EXCEPTION_CONTINUE_SEARCH;
}
#include "psapi.h"
typedef BOOL WINAPI (*GetModuleInformationFunc)(HANDLE hProcess, HMODULE hModule, LPMODULEINFO lpmodinfo, DWORD cb );
typedef WINBASEAPI HANDLE WINAPI (*OpenThreadFunc)(DWORD, BOOL, DWORD);
void *ownBaseAddress = 0;
unsigned int ownSize = 0x01000000;
DWORD mainThreadID = 0;
OpenThreadFunc OpenThreadDyn;
void registerCrashHandler(int mode)
{
if (mode >= 0) {
SetUnhandledExceptionFilter(&crashHandler);
if (!(mode & CRASH_HANDLER_LOOP_GUARDIAN_DISABLED)) {
OpenThreadDyn = (OpenThreadFunc)(GetProcAddress(GetModuleHandleA("kernel32.dll"), "OpenThread"));
if (OpenThreadDyn) {
mainThreadID = GetCurrentThreadId();
MODULEINFO moduleInfo;
HMODULE psapi = LoadLibraryA("psapi.dll");
GetModuleInformationFunc GetModuleInformation = (GetModuleInformationFunc)(GetProcAddress(psapi, "K32GetModuleInformation"));
if (!GetModuleInformation) GetModuleInformation = (GetModuleInformationFunc)(GetProcAddress(psapi, "GetModuleInformation"));
if ((*GetModuleInformation)(GetCurrentProcess(), GetModuleHandle(0), &moduleInfo, sizeof(moduleInfo))) {
ownBaseAddress = moduleInfo.lpBaseOfDll;
ownSize = moduleInfo.SizeOfImage;
}
}
}
}
}
QString getLastCrashInformationInternal()
{
return QString::fromLocal8Bit(exceptionCodeToName(lastExceptionCode)) + " at " + QString::number(lastExceptionAddress, 16);
}
bool isAddressInTeXstudio(char *address)
{
return address >= ownBaseAddress && address <= ((char *)ownBaseAddress) + ownSize;
}
typedef bool (*ChangeThreadContextFunc)(HANDLE thread, CONTEXT *c);
bool doSomethingWithMainThreadContext(ChangeThreadContextFunc something)
{
if (!mainThreadID || !OpenThreadDyn) return false;
HANDLE mainThread = (*OpenThreadDyn)(THREAD_GET_CONTEXT | THREAD_QUERY_INFORMATION | THREAD_SET_CONTEXT | THREAD_SUSPEND_RESUME, false, mainThreadID);
if (!mainThread) return false;
bool result = false;
SuspendThread(mainThread);
CONTEXT c;
c.ContextFlags = (CONTEXT_FULL);
if (GetThreadContext(mainThread, &c))
result = (*something)(mainThread, &c);
ResumeThread(mainThread);
CloseHandle(mainThread);
return result;
}
CONTEXT lastRecoveredContext;
bool changeContextToRecover(HANDLE thread, CONTEXT *c)
{
bool result = false;
if (isAddressInTeXstudio((char *)(PC_FROM_UCONTEXT(c)))) {
lastRecoveredContext = *c;
SimulatedCPU cpu;
cpu.set_all(c);
cpu.call((char *)&recover);
cpu.get_all(c);
result = SetThreadContext(thread, c);
if (result) lastErrorType = ERR_LOOP;
}
return result;
}
bool recoverMainThreadFromOutside()
{
return doSomethingWithMainThreadContext(changeContextToRecover);
}
bool changeContextToUndoRecoving(HANDLE thread, CONTEXT *c)
{
Q_UNUSED(c);
return SetThreadContext(thread, &lastRecoveredContext);
}
void undoMainThreadRecoveringFromOutside()
{
doSomethingWithMainThreadContext(changeContextToUndoRecoving);
}
#endif
#if !defined(USE_SIGNAL_HANDLER) && !defined(Q_OS_WIN32)
#warning Unrecognized OS. Crash handler will be disabled.
bool recoverMainThreadFromOutside()
{
fprintf(stderr, "Main thread locks frozen\n");
return true;
}
void undoMainThreadRecoveringFromOutside() {}
QString getLastCrashInformationInternal()
{
return "unknown (os unsupported by crash handler)";
}
void registerCrashHandler(int mode) {}
#endif
//========================NEW ASSERT==============================
#undef qt_assert
Q_CORE_EXPORT void qt_assert(const char *assertion, const char *file, int line) ASSERT_THROW ;
Q_CORE_EXPORT void qt_assert_x(const char *where, const char *what, const char *file, int line) ASSERT_THROW ;
QString lastAssert;
void txs_assert_x(const char *where, const char *assertion, const char *file, int line) ASSERT_THROW
{
lastAssert = QString("Assert failure: %1 at %2 in %3:%4").arg(assertion).arg(where).arg(file).arg(line);
print_backtrace(lastAssert);
lastErrorType = ERR_ASSERT;
recover();
//won't be called:
qt_assert(assertion, file, line);
exit(1);
}
void txs_assert(const char *assertion, const char *file, int line) ASSERT_THROW
{
txs_assert_x("something", assertion, file, line);
}
QString getLastCrashInformation(bool &wasLoop)
{
wasLoop = lastErrorType == ERR_LOOP;
switch (lastErrorType) {
case ERR_ASSERT:
return lastAssert;
case ERR_EXCEPTION:
return "c++ exception";
default:
return getLastCrashInformationInternal();
}
}
//======================== CPU Information ==============================
#ifdef CPU_CONTEXT_TYPE
void SimulatedCPU::set_all(void *ccontext)
{
CPU_CONTEXT_TYPE *context = static_cast<CPU_CONTEXT_TYPE *>(ccontext);
this->pc = (char *)PC_FROM_UCONTEXT(context);
this->frame = (char *)FRAME_FROM_UCONTEXT(context);
this->stack = (char *)STACK_FROM_UCONTEXT(context);
#ifdef RETURNTO_FROM_UCONTEXT
this->returnTo = (char *)RETURNTO_FROM_UCONTEXT(context);
#endif
// for (int i=0;i<sizeof(context->uc_mcontext.gregs) / sizeof(context->uc_mcontext.gregs[0]);i++)
// fprintf(stderr, "Regs: %i: %p\n", i, context->uc_mcontext.gregs[i]);
}
void SimulatedCPU::get_all(void *ccontext)
{
CPU_CONTEXT_TYPE *context = static_cast<CPU_CONTEXT_TYPE *>(ccontext);
memcpy(&PC_FROM_UCONTEXT(context), &this->pc, sizeof(char*));
memcpy(&FRAME_FROM_UCONTEXT(context), &this->frame, sizeof(char*));
memcpy(&STACK_FROM_UCONTEXT(context), &this->stack, sizeof(char*));
#ifdef RETURNTO_FROM_UCONTEXT
memcpy(&RETURNTO_FROM_UCONTEXT(context), &this->returnTo, sizeof(char*));
#endif
}
void SimulatedCPU::set_from_real()
{
this->pc = 0;
this->frame = 0;
this->stack = 0;
#ifdef CPU_IS_X86_32
__asm__(
"mov %%ebp, %0\n"
"mov %%esp, %1"
: "=r"(frame), "=r"(stack));
#elif defined(CPU_IS_X86_64)
__asm__(
"mov %%rbp, %0\n"
"mov %%rsp, %1"
: "=r"(frame), "=r"(stack));
#elif defined(CPU_IS_ARM)
__asm__( //otherway around in the mov than x86?
"mov %[fp], fp\n"
"mov %[sp], sp\n"
"mov %[lr], lr\n"
: [fp] "=r"(frame), [sp] "=r"(stack), [lr] "=r" (returnTo));
#elif defined(CPU_IS_IA64)
__asm__(
//"mov %0 = cfm\n"
"mov %0 = r12"
: /*"=r"(frame),*/ "=r"(stack));
#elif defined(CPU_IS_MIPS)
__asm__( //otherway around in the mov than x86?
"move %0, $30\n"
"move %1, $sp\n"
"move %2, $ra\n"
: "=r"(frame), "=r"(stack), "=r" (returnTo));
#elif defined(CPU_IS_PPC)
__asm__( //otherway around in the mov than x86?
"mr %0, 31\n"
"mr %1, 1\n"
"mflr %2\n"
: "=r"(frame), "=r"(stack), "=r" (returnTo));
#elif defined(CPU_IS_SPARC32)
__asm__(
"mov %i6, %0\n"
"mov %o6, %1\n"
"mov %i7, %2\n"
: "=r"(frame), "=r"(stack), "=r" (returnTo));
#elif defined(CPU_IS_S390_31)
__asm__(
"LR %0, %r11\n"
"LR %1, %r15\n"
: "=r"(frame), "=r"(stack));
#elif defined(CPU_IS_S390_64)
__asm__(
"LGR %0, %r11\n"
"LGR %1, %r15\n"
: "=r"(frame), "=r"(stack));
#else
#error Unknown processor architecture
#endif
geteip:
this->pc = (char *) && geteip;
}
#endif
//todo: fix CALL_INSTRUCTION_SIZE
//(should be the size of the call instruction.
//however, since the call instruction is in the signal handler and not actually part of the program, 0 might be the more correct value)
#define CALL_INSTRUCTION_SIZE 0
#if defined(CPU_IS_X86_64) || defined (CPU_IS_X86_32)
//TODO: check ppc
void SimulatedCPU::call(char *value)
{
push(pc + CALL_INSTRUCTION_SIZE);
jmp(value);
}
void SimulatedCPU::ret()
{
pc = pop();
}
void SimulatedCPU::enter(int size)
{
push(frame);
frame = stack;
stack -= size;
}
void SimulatedCPU::leave()
{
sigSegvRecoverReturnAddress = && recover;
stack = frame;
frame = pop();
ret();
recover:
if (sigSegvRecoverReturnAddress == 0) {
frame = 0;
stack = 0;
pc = 0;
}
sigSegvRecoverReturnAddress = 0;
}
#elif defined(CPU_IS_ARM) || defined(CPU_IS_MIPS)
//todo: does this work on mips?
void SimulatedCPU::call(char *value) //bl
{
returnTo = pc + CALL_INSTRUCTION_SIZE;
jmp(value);
}
void SimulatedCPU::ret()
{
pc = returnTo;
}
void SimulatedCPU::enter(int size)
{
push(returnTo);
push(frame);
frame = stack + 4;
stack -= size;
}
void SimulatedCPU::leave()
{
stack = frame - 4;
frame = pop();
returnTo = pop();
ret();
}
#elif defined(CPU_IS_PPC)
//see https://developer.apple.com/library/mac/#documentation/DeveloperTools/Conceptual/LowLevelABI/110-64-bit_PowerPC_Function_Calling_Conventions/64bitPowerPC.html#//apple_ref/doc/uid/TP40002471-SW14
void SimulatedCPU::call(char *value) //bl
{
returnTo = pc + CALL_INSTRUCTION_SIZE;
jmp(value);
}
void SimulatedCPU::ret()
{
pc = returnTo;
}
void SimulatedCPU::enter(int size)
{
//todo
}
void SimulatedCPU::leave()
{
returnTo = *(char **)(stack + 2 * 8);
stack = pop();
frame = stack; //??
ret();
}
#elif defined(CPU_IS_IA64) || defined(CPU_IS_SPARC32) || defined(CPU_IS_S390_31) || defined(CPU_IS_390_64)
//not really implemented
//not possible on SPARC? (as register windows are protected)
void SimulatedCPU::call(char *value) //bl
{
jmp(value);
//todo this should do an awful lot of register swapping/saving for IA64
}
void SimulatedCPU::ret()
{
//pc = br0;
pc = 0;
}
void SimulatedCPU::enter(int size)
{
}
void SimulatedCPU::leave()
{
ret();
}
#else
#error Unknown cpu architecture
#endif
bool SimulatedCPU::stackWalk()
{
leave();
pc -= CALL_INSTRUCTION_SIZE;
// fprintf(stderr, "%p (at %p), %p (at %p), %p\n", *(char**)(frame),frame, *(char**)(stack), stack, pc);
return frame >= stack && frame && stack;
}
void catchUnhandledException()
{
lastErrorType = ERR_EXCEPTION;
recover();
}
#else
// defined NO_CRASH_HANDLER
QString print_backtrace(const QString &message)
{
Q_UNUSED(message) return "";
}
void registerCrashHandler(int mode)
{
Q_UNUSED(mode)
}QString getLastCrashInformation(bool &wasLoop)
{
Q_UNUSED(wasLoop);
return "";
}
void catchUnhandledException() {}
#endif
#ifdef HAS_DEBUGGER_PRESENT
#undef HAS_DEBUGGER_PRESENT
#endif
#ifdef Q_OS_WIN32
#define HAS_DEBUGGER_PRESENT
#else
#if (!defined(QT_NO_DEBUG) && defined(Q_OS_LINUX))
#define HAS_DEBUGGER_PRESENT
#include <sys/ptrace.h>
//from http://stackoverflow.com/questions/3596781/detect-if-gdb-is-running
#ifndef NO_CRASH_HANDLER
int gdb_check()
{
pid_t pid = fork();
int status;
int res;
if (pid == -1) {
perror("fork");
return -1;
}
if (pid == 0) {
pid_t ppid = getppid();
/* Child */
if (ptrace(PTRACE_ATTACH, ppid, NULL, NULL) == 0) {
/* Wait for the parent to stop and continue it */
waitpid(ppid, NULL, 0);
ptrace(PTRACE_CONT, ppid, NULL, NULL);
/* Detach */
ptrace(PTRACE_DETACH, ppid, NULL, NULL);
/* We were the tracers, so gdb is not present */
res = 0;
} else {
/* Trace failed so gdb is present */
res = 1;
}
_Exit(res);
} else {
waitpid(pid, &status, 0);
res = WEXITSTATUS(status);
}
return res;
}
int _debugger_present = -1;
bool IsDebuggerPresent()
{
if (-1 == _debugger_present)
_debugger_present = gdb_check();
if (_debugger_present == 1) {
fprintf(stderr, "debugger detected: no recovering\n\n");
fflush(stderr);
}
return _debugger_present == 1;
}
#endif
#endif
#endif
void initCrashHandler(int mode)
{
#ifndef NO_CRASH_HANDLER
crashHandlerType = mode;
registerCrashHandler(mode);
if (mode >= 0) std::set_terminate(&catchUnhandledException);
#else
Q_UNUSED(mode);
#endif
}
//==================GUARDIAN==================
Guardian *guardian = 0;
bool running = true;
volatile int mainEventLoopTicks = 0;
volatile bool undoRecovering = false;
void Guardian::run()
{
#ifndef NO_CRASH_HANDLER
int lastTick = mainEventLoopTicks;
int errors = 0;
while (running) {
int slowOperationWait = slowOperations * 15;
do {
sleep(10);
slowOperationWait -= 1;
} while (slowOperationWait >= 0);
if (undoRecovering) {
undoRecovering = false;
errors = 1;
undoMainThreadRecoveringFromOutside();
continue;
}
if (crashHandlerType & CRASH_HANDLER_LOOP_GUARDIAN_DISABLED) continue;
if (lastTick == mainEventLoopTicks) errors++;
else errors = 0;
lastTick = mainEventLoopTicks;
if (errors >= 60) {
fprintf(stderr, "Main thread in trouble\n");
#ifdef HAS_DEBUGGER_PRESENT
if (IsDebuggerPresent()) return;
#endif
int repetitions = 0;
while (lastTick == mainEventLoopTicks && !recoverMainThreadFromOutside()) {
msleep(50);
repetitions ++;
if (repetitions > 50) break; //give up for now
}
if (repetitions < 50) //recovered
errors -= 6 ; //wait 1 min now
//if (repetitions < 50) return; the crash handler can't be debugged, if this thread continues calling it
}
}
guardian = 0;
#endif
}
void Guardian::summon()
{
#ifndef NO_CRASH_HANDLER
if (guardian) return;
if (crashHandlerType & CRASH_HANDLER_LOOP_GUARDIAN_DISABLED) return;
guardian = new Guardian();
guardian->start();
#endif
}
void Guardian::calm()
{
mainEventLoopTicks++;
}
void Guardian::shutdown()
{
running = false;
}
void Guardian::continueEndlessLoop()
{
undoRecovering = true;
}
Guardian *Guardian::instance()
{
return guardian;
}
void Guardian::slowOperationStarted()
{
slowOperations++;
}
void Guardian::slowOperationEnded()
{
slowOperations--;
if (slowOperations < 0) slowOperations = 0;
}
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