except.c File Reference

#include <float.h>
#include <signal.h>
#include <stdarg.h>
#include <stdbool.h>
#include "ntstatus.h"
#include "windef.h"
#include "winbase.h"
#include "winternl.h"
#include "msvcrt.h"
#include "excpt.h"
#include "wincon.h"
#include "wine/debug.h"
#include "cppexcept.h"

Include dependency graph for except.c:

Go to the source code of this file.

Classes
struct	__std_exception_data

Macros
#define	WIN32_NO_STATUS

Typedefs
typedef void(CDECL *	float_handler) (int, int)

Functions
	WINE_DEFAULT_DEBUG_CHANNEL (seh)
static BOOL WINAPI	msvcrt_console_handler (DWORD ctrlType)
void **CDECL	__pxcptinfoptrs (void)
static LONG	msvcrt_exception_filter (struct _EXCEPTION_POINTERS *except)
void	msvcrt_init_signals (void)
void	msvcrt_free_signals (void)
__sighandler_t CDECL	signal (int sig, __sighandler_t func)
int CDECL	raise (int sig)
int CDECL	_XcptFilter (NTSTATUS ex, PEXCEPTION_POINTERS ptr)
int CDECL	__intrinsic_abnormal_termination (void)
BOOL CDECL	__uncaught_exception (void)
frame_info *CDECL	_CreateFrameInfo (frame_info *fi, void *obj)
void CDECL	_FindAndUnlinkFrame (frame_info *fi)
BOOL __cdecl	_IsExceptionObjectToBeDestroyed (const void *obj)
void CDECL	__DestructExceptionObject (EXCEPTION_RECORD *rec)
BOOL CDECL	__CxxRegisterExceptionObject (EXCEPTION_POINTERS *ep, cxx_frame_info *frame_info)
void CDECL	__CxxUnregisterExceptionObject (cxx_frame_info *frame_info, BOOL in_use)

Variables
static __sighandler_t	sighandlers [NSIG] = { SIG_DFL }
struct {
NTSTATUS   status
int   signal
}	float_exception_map []

Macro Definition Documentation

WIN32_NO_STATUS

#define WIN32_NO_STATUS

Definition at line 30 of file except.c.

Typedef Documentation

float_handler

typedef void(CDECL * float_handler) (int, int)

Definition at line 78 of file except.c.

Function Documentation

__CxxRegisterExceptionObject()

BOOL CDECL __CxxRegisterExceptionObject	(	EXCEPTION_POINTERS *	ep,
		cxx_frame_info *	frame_info
	)

Definition at line 444 of file except.c.

{
    thread_data_t *data = msvcrt_get_thread_data();
 
    TRACE("(%p, %p)\n", ep, frame_info);
 
    if (!ep || !ep->ExceptionRecord)
    {
        frame_info->rec = (void*)-1;
        frame_info->context = (void*)-1;
        return TRUE;
    }
 
    frame_info->rec = data->exc_record;
    frame_info->context = data->ctx_record;
    data->exc_record = ep->ExceptionRecord;
    data->ctx_record = ep->ContextRecord;
    _CreateFrameInfo(&frame_info->frame_info, (void*)ep->ExceptionRecord->ExceptionInformation[1]);
    return TRUE;
}

__CxxUnregisterExceptionObject()

void CDECL __CxxUnregisterExceptionObject	(	cxx_frame_info *	frame_info,
		BOOL	in_use
	)

Definition at line 468 of file except.c.

{
    thread_data_t *data = msvcrt_get_thread_data();
 
    TRACE("(%p)\n", frame_info);
 
    if(frame_info->rec == (void*)-1)
        return;
 
    _FindAndUnlinkFrame(&frame_info->frame_info);
    if(data->exc_record->ExceptionCode == CXX_EXCEPTION && !in_use
            && _IsExceptionObjectToBeDestroyed((void*)data->exc_record->ExceptionInformation[1]))
        __DestructExceptionObject(data->exc_record);
    data->exc_record = frame_info->rec;
    data->ctx_record = frame_info->context;
}

__DestructExceptionObject()

void CDECL __DestructExceptionObject

(

EXCEPTION_RECORD *

rec

)

Definition at line 409 of file except.c.

{
    cxx_exception_type *info = (cxx_exception_type*) rec->ExceptionInformation[2];
    void *object = (void*)rec->ExceptionInformation[1];
 
    TRACE("(%p)\n", rec);
 
    if (rec->ExceptionCode != CXX_EXCEPTION) return;
#ifndef __x86_64__
    if (rec->NumberParameters != 3) return;
#else
    if (rec->NumberParameters != 4) return;
#endif
    if (rec->ExceptionInformation[0] < CXX_FRAME_MAGIC_VC6 ||
            rec->ExceptionInformation[0] > CXX_FRAME_MAGIC_VC8) return;
 
    if (!info || !info->destructor)
        return;
 
#if defined(__i386__)
#ifdef _MSC_VER
    ((void(__fastcall*)(void*))info->destructor)(object);
#else
    __asm__ __volatile__("call *%0" : : "r" (info->destructor), "c" (object) : "eax", "edx", "memory");
#endif
#elif defined(__x86_64__)
    ((void (__cdecl*)(void*))(info->destructor+rec->ExceptionInformation[3]))(object);
#else
    ((void (__cdecl*)(void*))info->destructor)(object);
#endif
}

Referenced by __CxxUnregisterExceptionObject().

__intrinsic_abnormal_termination()

int CDECL __intrinsic_abnormal_termination

(

void

)

Definition at line 289 of file except.c.

{
  FIXME("(void)stub\n");
  return 0;
}

__pxcptinfoptrs()

void **CDECL __pxcptinfoptrs

(

void

)

Definition at line 73 of file except.c.

{
    return (void**)&msvcrt_get_thread_data()->xcptinfo;
}

Referenced by msvcrt_exception_filter(), and raise().

__uncaught_exception()

BOOL CDECL __uncaught_exception

(

void

)

Definition at line 299 of file except.c.

{
    return msvcrt_get_thread_data()->processing_throw != 0;
}

_CreateFrameInfo()

frame_info *CDECL _CreateFrameInfo	(	frame_info *	fi,
		void *	obj
	)

Definition at line 348 of file except.c.

{
    thread_data_t *data = msvcrt_get_thread_data();
 
    TRACE("(%p, %p)\n", fi, obj);
 
    fi->next = data->frame_info_head;
    data->frame_info_head = fi;
    fi->object = obj;
    return fi;
}

Referenced by __CxxRegisterExceptionObject().

_FindAndUnlinkFrame()

void CDECL _FindAndUnlinkFrame

(

frame_info *

fi

)

Definition at line 363 of file except.c.

{
    thread_data_t *data = msvcrt_get_thread_data();
    frame_info *cur = data->frame_info_head;
 
    TRACE("(%p)\n", fi);
 
    if (cur == fi)
    {
        data->frame_info_head = cur->next;
        return;
    }
 
    for (; cur->next; cur = cur->next)
    {
        if (cur->next == fi)
        {
            cur->next = fi->next;
            return;
        }
    }
 
    ERR("frame not found, native crashes in this case\n");
}

Referenced by __CxxUnregisterExceptionObject().

_IsExceptionObjectToBeDestroyed()

BOOL __cdecl _IsExceptionObjectToBeDestroyed

(

const void *

obj

)

Definition at line 391 of file except.c.

{
    frame_info *cur;
 
    TRACE( "%p\n", obj );
 
    for (cur = msvcrt_get_thread_data()->frame_info_head; cur; cur = cur->next)
    {
        if (cur->object == obj)
            return FALSE;
    }
 
    return TRUE;
}

Referenced by __CxxUnregisterExceptionObject().

_XcptFilter()

int CDECL _XcptFilter	(	NTSTATUS	ex,
		PEXCEPTION_POINTERS	ptr
	)

Definition at line 278 of file except.c.

{
    TRACE("(%08x,%p)\n", ex, ptr);
    /* I assume ptr->ExceptionRecord->ExceptionCode is the same as ex */
    return msvcrt_exception_filter(ptr);
}

msvcrt_console_handler()

static BOOL WINAPI msvcrt_console_handler ( DWORD  ctrlType )

static

Definition at line 52 of file except.c.

{
    BOOL ret = FALSE;
 
    switch (ctrlType)
    {
    case CTRL_C_EVENT:
        if (sighandlers[SIGINT])
        {
            if (sighandlers[SIGINT] != SIG_IGN)
                sighandlers[SIGINT](SIGINT);
            ret = TRUE;
        }
        break;
    }
    return ret;
}

Referenced by msvcrt_free_signals(), and msvcrt_init_signals().

msvcrt_exception_filter()

static LONG msvcrt_exception_filter ( struct _EXCEPTION_POINTERS *  except )

static

Definition at line 95 of file except.c.

{
    LONG ret = EXCEPTION_CONTINUE_SEARCH;
    __sighandler_t handler;
 
    if (!except || !except->ExceptionRecord)
        return EXCEPTION_CONTINUE_SEARCH;
 
    switch (except->ExceptionRecord->ExceptionCode)
    {
    case EXCEPTION_ACCESS_VIOLATION:
        if ((handler = sighandlers[SIGSEGV]) != SIG_DFL)
        {
            if (handler != SIG_IGN)
            {
                EXCEPTION_POINTERS **ep = (EXCEPTION_POINTERS**)__pxcptinfoptrs(), *old_ep;
 
                old_ep = *ep;
                *ep = except;
                sighandlers[SIGSEGV] = SIG_DFL;
                handler(SIGSEGV);
                *ep = old_ep;
            }
            ret = EXCEPTION_CONTINUE_EXECUTION;
        }
        break;
    /* According to msdn,
     * the FPE signal handler takes as a second argument the type of
     * floating point exception.
     */
    case EXCEPTION_FLT_DENORMAL_OPERAND:
    case EXCEPTION_FLT_DIVIDE_BY_ZERO:
    case EXCEPTION_FLT_INEXACT_RESULT:
    case EXCEPTION_FLT_INVALID_OPERATION:
    case EXCEPTION_FLT_OVERFLOW:
    case EXCEPTION_FLT_STACK_CHECK:
    case EXCEPTION_FLT_UNDERFLOW:
        if ((handler = sighandlers[SIGFPE]) != SIG_DFL)
        {
            if (handler != SIG_IGN)
            {
                EXCEPTION_POINTERS **ep = (EXCEPTION_POINTERS**)__pxcptinfoptrs(), *old_ep;
                unsigned int i;
                int float_signal = _FPE_INVALID;
 
                sighandlers[SIGFPE] = SIG_DFL;
                for (i = 0; i < ARRAY_SIZE(float_exception_map); i++)
                {
                    if (float_exception_map[i].status ==
                        except->ExceptionRecord->ExceptionCode)
                    {
                        float_signal = float_exception_map[i].signal;
                        break;
                    }
                }
 
                old_ep = *ep;
                *ep = except;
                ((float_handler)handler)(SIGFPE, float_signal);
                *ep = old_ep;
            }
            ret = EXCEPTION_CONTINUE_EXECUTION;
        }
        break;
    case EXCEPTION_ILLEGAL_INSTRUCTION:
    case EXCEPTION_PRIV_INSTRUCTION:
        if ((handler = sighandlers[SIGILL]) != SIG_DFL)
        {
            if (handler != SIG_IGN)
            {
                EXCEPTION_POINTERS **ep = (EXCEPTION_POINTERS**)__pxcptinfoptrs(), *old_ep;
 
                old_ep = *ep;
                *ep = except;
                sighandlers[SIGILL] = SIG_DFL;
                handler(SIGILL);
                *ep = old_ep;
            }
            ret = EXCEPTION_CONTINUE_EXECUTION;
        }
        break;
    }
    return ret;
}

Referenced by _XcptFilter().

msvcrt_free_signals()

void msvcrt_free_signals

(

void

)

Definition at line 185 of file except.c.

{
    SetConsoleCtrlHandler(msvcrt_console_handler, FALSE);
}

msvcrt_init_signals()

void msvcrt_init_signals

(

void

)

Definition at line 180 of file except.c.

{
    SetConsoleCtrlHandler(msvcrt_console_handler, TRUE);
}

raise()

int CDECL raise

(

int

sig

)

Definition at line 228 of file except.c.

{
    __sighandler_t handler;
 
    TRACE("(%d)\n", sig);
 
    switch (sig)
    {
    case SIGFPE:
    case SIGILL:
    case SIGSEGV:
        handler = sighandlers[sig];
        if (handler == SIG_DFL) _exit(3);
        if (handler != SIG_IGN)
        {
            EXCEPTION_POINTERS **ep = (EXCEPTION_POINTERS**)__pxcptinfoptrs(), *old_ep;
 
            sighandlers[sig] = SIG_DFL;
 
            old_ep = *ep;
            *ep = NULL;
            if (sig == SIGFPE)
                ((float_handler)handler)(sig, _FPE_EXPLICITGEN);
            else
                handler(sig);
            *ep = old_ep;
        }
        break;
    case SIGABRT:
    case SIGINT:
    case SIGTERM:
    case SIGBREAK:
        handler = sighandlers[sig];
        if (handler == SIG_DFL) _exit(3);
        if (handler != SIG_IGN)
        {
            sighandlers[sig] = SIG_DFL;
            handler(sig);
        }
        break;
    default:
        return -1;
    }
    return 0;
}

signal()

__sighandler_t CDECL signal	(	int	sig,
		__sighandler_t	func
	)

Definition at line 196 of file except.c.

{
    __sighandler_t ret = SIG_ERR;
 
    TRACE("(%d, %p)\n", sig, func);
 
    if (func == SIG_ERR) return SIG_ERR;
 
    switch (sig)
    {
    /* Cases handled internally.  Note SIGTERM is never generated by Windows,
     * so we effectively mask it.
     */
    case SIGABRT:
    case SIGFPE:
    case SIGILL:
    case SIGSEGV:
    case SIGINT:
    case SIGTERM:
    case SIGBREAK:
        ret = sighandlers[sig];
        sighandlers[sig] = func;
        break;
    default:
        ret = SIG_ERR;
    }
    return ret;
}

WINE_DEFAULT_DEBUG_CHANNEL()

WINE_DEFAULT_DEBUG_CHANNEL

(

seh

)

Variable Documentation

const struct { ... } float_exception_map[]

Initial value:

= {
 { EXCEPTION_FLT_DENORMAL_OPERAND, _FPE_DENORMAL },
 { EXCEPTION_FLT_DIVIDE_BY_ZERO, _FPE_ZERODIVIDE },
 { EXCEPTION_FLT_INEXACT_RESULT, _FPE_INEXACT },
 { EXCEPTION_FLT_INVALID_OPERATION, _FPE_INVALID },
 { EXCEPTION_FLT_OVERFLOW, _FPE_OVERFLOW },
 { EXCEPTION_FLT_STACK_CHECK, _FPE_STACKOVERFLOW },
 { EXCEPTION_FLT_UNDERFLOW, _FPE_UNDERFLOW },
}

Referenced by msvcrt_exception_filter().

sighandlers

__sighandler_t sighandlers[NSIG] = { SIG_DFL }

static

Definition at line 50 of file except.c.

Referenced by msvcrt_console_handler(), msvcrt_exception_filter(), raise(), and signal().

signal

int signal

Definition at line 84 of file except.c.

Referenced by __rpc_get_time_offset(), _gnu_exception_handler(), alarm_intr(), check_blocks(), command(), do_test(), ensure_adns_init(), FTPGetOneF(), FTPListToMemory2(), FTPPutOneF(), FTPShutdownHost(), getreply(), GetResponse(), main(), OpenControlConnection(), pswitch(), raise(), recvrequest(), shell(), signal(), test___pxcptinfoptrs(), test_signal(), testwindow_wndproc(), TRIO_ARGS1(), trio_nan(), trio_pinf(), and XferCanceller().

status

NTSTATUS status

Definition at line 83 of file except.c.