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157 lines
4.7 KiB
157 lines
4.7 KiB
/***
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*throw.cxx - Implementation of the 'throw' command.
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*
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* Copyright (c) 1993-2001, Microsoft Corporation. All rights reserved.
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*
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*Purpose:
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* Implementation of the exception handling 'throw' command.
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*
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* Entry points:
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* * _CxxThrowException - does the throw.
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*
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*Revision History:
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* 05-25-93 BS Module created
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* 09-29-94 GJF Made (__)pMyUnhandledExceptionFilter global so the
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* compiler (DEC Alpha) wouldn't optimize it away.
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* 10-17-94 BWT Disable code for PPC.
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* 02-03-95 BWT Remove Alpha export hack.
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* 02-09-95 JWM Mac merge.
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* 04-13-95 DAK Add NT Kernel EH support
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* 04-25-95 DAK More Kernel work
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* 03-02-98 RKP Add 64 bit support
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* 05-17-99 PML Remove all Macintosh support.
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* 03-15-00 PML Remove CC_P7_SOFT25, which is now on permanently.
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*
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****/
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#include <stddef.h>
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#if defined(_NTSUBSET_)
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extern "C" {
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#include <nt.h>
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#include <ntrtl.h>
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#include <nturtl.h>
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#include <ntstatus.h> // STATUS_UNHANDLED_EXCEPTION
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#include <ntos.h>
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#include <ex.h> // ExRaiseException
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}
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#endif
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#include <windows.h>
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#include <mtdll.h>
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#include <ehdata.h>
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#include <eh.h>
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#include <ehhooks.h>
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#include <ehassert.h>
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#pragma hdrstop
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//
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// Make sure PULONG_PTR is available
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//
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#if defined(_X86_) && _MSC_VER >= 1300
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#define _W64 __w64
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#else
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#define _W64
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#endif
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#if !defined(PULONG_PTR)
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#if defined(_WIN64)
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typedef unsigned __int64 * PULONG_PTR;
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#else
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typedef _W64 unsigned long * PULONG_PTR;
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#endif
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#endif
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#if defined(_M_IA64) || defined(_M_AMD64)
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extern "C" PVOID RtlPcToFileHeader(PVOID, PVOID*);
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extern "C" PVOID _ReturnAddress(VOID);
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#pragma intrinsic(_ReturnAddress)
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#endif
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//
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// Make sure the terminate wrapper is dragged in:
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//
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#if defined(_NTSUBSET_)
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void * __pMyUnhandledExceptionFilter = 0;
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#else
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void * __pMyUnhandledExceptionFilter = &__CxxUnhandledExceptionFilter;
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#endif
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/////////////////////////////////////////////////////////////////////////////
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//
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// _CxxThrowException - implementation of 'throw'
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//
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// Description:
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// Builds the NT Exception record, and calls the NT runtime to initiate
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// exception processing.
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//
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// Why is pThrowInfo defined as _ThrowInfo? Because _ThrowInfo is secretly
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// snuck into the compiler, as is the prototype for _CxxThrowException, so
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// we have to use the same type to keep the compiler happy.
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//
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// Another result of this is that _CRTIMP can't be used here. Instead, we
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// synthesisze the -export directive below.
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//
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// Returns:
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// NEVER. (until we implement resumable exceptions, that is)
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//
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extern "C" void __stdcall _CxxThrowException(
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void* pExceptionObject, // The object thrown
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#if _MSC_VER >= 900 /*IFSTRIP=IGN*/
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_ThrowInfo* pThrowInfo // Everything we need to know about it
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#else
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ThrowInfo* pThrowInfo // Everything we need to know about it
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#endif
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) {
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EHTRACE_ENTER_FMT1("Throwing object @ 0x%p", pExceptionObject);
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static const EHExceptionRecord ExceptionTemplate = { // A generic exception record
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EH_EXCEPTION_NUMBER, // Exception number
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EXCEPTION_NONCONTINUABLE, // Exception flags (we don't do resume)
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NULL, // Additional record (none)
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NULL, // Address of exception (OS fills in)
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EH_EXCEPTION_PARAMETERS, // Number of parameters
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{ EH_MAGIC_NUMBER1, // Our version control magic number
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NULL, // pExceptionObject
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NULL,
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#if defined(_M_IA64) || defined (_M_AMD64)
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NULL // Image base of thrown object
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#endif
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} // pThrowInfo
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};
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EHExceptionRecord ThisException = ExceptionTemplate; // This exception
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//
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// Fill in the blanks:
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//
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ThisException.params.pExceptionObject = pExceptionObject;
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ThisException.params.pThrowInfo = (ThrowInfo*)pThrowInfo;
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#if defined(_M_IA64) || defined(_M_AMD64)
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PVOID ThrowImageBase = RtlPcToFileHeader(_ReturnAddress(), &ThrowImageBase);
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ThisException.params.pThrowImageBase = ThrowImageBase;
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#endif
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//
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// Hand it off to the OS:
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//
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EHTRACE_EXIT;
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#if defined(_M_AMD64)
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RtlRaiseException( (PEXCEPTION_RECORD) &ThisException );
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#else
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#if defined(_NTSUBSET_)
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ExRaiseException( (PEXCEPTION_RECORD) &ThisException );
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#else
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RaiseException( ThisException.ExceptionCode,
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ThisException.ExceptionFlags,
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ThisException.NumberParameters,
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(PULONG_PTR)&ThisException.params );
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#endif
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#endif
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}
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