C++ (Cpp) PAL_VirtualUnwind示例

示例#1

文件： seh-unwind.cpp 项目： ravindrapro/coreclr

/*++
Function:
    RtlpRaiseException

Parameters:
    ExceptionRecord - the Windows exception record to throw

Note:
    The name of this function and the name of the ExceptionRecord 
    parameter is used in the sos lldb plugin code to read the exception
    record. See coreclr\src\ToolBox\SOS\lldbplugin\debugclient.cpp.
--*/
PAL_NORETURN
static void RtlpRaiseException(EXCEPTION_RECORD *ExceptionRecord)
{
    // Capture the context of RtlpRaiseException.
    CONTEXT ContextRecord;
    ZeroMemory(&ContextRecord, sizeof(CONTEXT));
    ContextRecord.ContextFlags = CONTEXT_FULL;
    CONTEXT_CaptureContext(&ContextRecord);

    // Find the caller of RtlpRaiseException.  
    PAL_VirtualUnwind(&ContextRecord, NULL);

    // The frame we're looking at now is RaiseException. We have to unwind one 
    // level further to get the actual context user code could be resumed at.
    PAL_VirtualUnwind(&ContextRecord, NULL);
#if defined(_X86_)
    ExceptionRecord->ExceptionAddress = (void *) ContextRecord.Eip;
#elif defined(_AMD64_)
    ExceptionRecord->ExceptionAddress = (void *) ContextRecord.Rip;
#elif defined(_ARM_) || defined(_ARM64_)
    ExceptionRecord->ExceptionAddress = (void *) ContextRecord.Pc;
#else
#error unsupported architecture
#endif

    EXCEPTION_POINTERS pointers;
    pointers.ExceptionRecord = ExceptionRecord;
    pointers.ContextRecord = &ContextRecord;

    SEHRaiseException(InternalGetCurrentThread(), &pointers, 0);
}

示例#2

文件： seh-unwind.cpp 项目： chunseoklee/coreclr

VOID
PALAPI
RaiseException(IN DWORD dwExceptionCode,
               IN DWORD dwExceptionFlags,
               IN DWORD nNumberOfArguments,
               IN CONST ULONG_PTR *lpArguments)
{
    // PERF_ENTRY_ONLY is used here because RaiseException may or may not
    // return. We can not get latency data without PERF_EXIT. For this reason,
    // PERF_ENTRY_ONLY is used to profile frequency only.
    PERF_ENTRY_ONLY(RaiseException);
    ENTRY("RaiseException(dwCode=%#x, dwFlags=%#x, nArgs=%u, lpArguments=%p)\n",
          dwExceptionCode, dwExceptionFlags, nNumberOfArguments, lpArguments);

    /* Validate parameters */
    if (dwExceptionCode & RESERVED_SEH_BIT)
    {
        WARN("Exception code %08x has bit 28 set; clearing it.\n", dwExceptionCode);
        dwExceptionCode ^= RESERVED_SEH_BIT;
    }

    if (nNumberOfArguments > EXCEPTION_MAXIMUM_PARAMETERS)
    {
        WARN("Number of arguments (%d) exceeds the limit "
            "EXCEPTION_MAXIMUM_PARAMETERS (%d); ignoring extra parameters.\n",
            nNumberOfArguments, EXCEPTION_MAXIMUM_PARAMETERS);
        nNumberOfArguments = EXCEPTION_MAXIMUM_PARAMETERS;
    }

    CONTEXT *contextRecord;
    EXCEPTION_RECORD *exceptionRecord;
    AllocateExceptionRecords(&exceptionRecord, &contextRecord);

    ZeroMemory(exceptionRecord, sizeof(EXCEPTION_RECORD));

    exceptionRecord->ExceptionCode = dwExceptionCode;
    exceptionRecord->ExceptionFlags = dwExceptionFlags;
    exceptionRecord->ExceptionRecord = NULL;
    exceptionRecord->ExceptionAddress = NULL; // will be set by RtlpRaiseException
    exceptionRecord->NumberParameters = nNumberOfArguments;
    if (nNumberOfArguments)
    {
        CopyMemory(exceptionRecord->ExceptionInformation, lpArguments,
                   nNumberOfArguments * sizeof(ULONG_PTR));
    }

    // Capture the context of RaiseException.
    ZeroMemory(contextRecord, sizeof(CONTEXT));
    contextRecord->ContextFlags = CONTEXT_FULL;
    CONTEXT_CaptureContext(contextRecord);

    // We have to unwind one level to get the actual context user code could be resumed at.
    PAL_VirtualUnwind(contextRecord, NULL);

    exceptionRecord->ExceptionAddress = (void *)CONTEXTGetPC(contextRecord);

    RtlpRaiseException(exceptionRecord, contextRecord);

    LOGEXIT("RaiseException returns\n");
}