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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
// ===========================================================================
// File: palclr.h
//
// Various macros and constants that are necessary to make the CLR portable.
//
// ===========================================================================
#ifndef __PALCLR_WIN_H__
#define __PALCLR_WIN_H__
// PAL SEH
// Macros for portable exception handling. The Win32 SEH is emulated using
// these macros and setjmp/longjmp on Unix
//
// Usage notes:
//
// - The filter has to be a function taking two parameters:
// LONG MyFilter(PEXCEPTION_POINTERS *pExceptionInfo, PVOID pv)
//
// - It is not possible to directly use the local variables in the filter.
// All the local information that the filter has to need to know about should
// be passed through pv parameter
//
// - Do not use goto to jump out of the PAL_TRY block
// (jumping out of the try block is not a good idea even on Win32, because of
// it causes stack unwind)
//
//
// Simple examples:
//
// PAL_TRY {
// ....
// } WIN_PAL_FINALLY {
// ....
// }
// WIN_PAL_ENDTRY
//
//
// PAL_TRY {
// ....
// } WIN_PAL_EXCEPT(EXCEPTION_EXECUTE_HANDLER) {
// ....
// }
// WIN_PAL_ENDTRY
//
//
// LONG MyFilter(PEXCEPTION_POINTERS *pExceptionInfo, PVOID pv)
// {
// ...
// }
// PAL_TRY {
// ....
// } WIN_PAL_EXCEPT_FILTER(MyFilter, NULL) {
// ....
// }
// WIN_PAL_ENDTRY
//
//
// Complex example:
//
// struct MyParams
// {
// ...
// } params;
//
// PAL_TRY {
// PAL_TRY {
// ...
// if (error) goto Done;
// ...
// Done: ;
// } WIN_PAL_EXCEPT_FILTER(OtherFilter, ¶ms) {
// ...
// }
// WIN_PAL_ENDTRY
// }
// WIN_PAL_FINALLY {
// }
// WIN_PAL_ENDTRY
//
#if !defined(FEATURE_CORECLR)
#include "staticcontract.h"
#define WIN_PAL_TRY_NAKED \
{ \
bool __exHandled; __exHandled = false; \
DWORD __exCode; __exCode = 0; \
__try \
{
#define WIN_PAL_TRY \
{ \
WIN_PAL_TRY_NAKED \
WIN_PAL_TRY_HANDLER_DBG_BEGIN
#define WIN_PAL_TRY_FOR_DLLMAIN(_reason) \
{ \
WIN_PAL_TRY_NAKED \
WIN_PAL_TRY_HANDLER_DBG_BEGIN_DLLMAIN(_reason)
// Note: PAL_SEH_RESTORE_GUARD_PAGE is only ever defined in clrex.h, so we only restore guard pages automatically
// when these macros are used from within the VM.
#define WIN_PAL_SEH_RESTORE_GUARD_PAGE PAL_SEH_RESTORE_GUARD_PAGE
#define WIN_PAL_EXCEPT_NAKED(Disposition) \
} __except(__exCode = GetExceptionCode(), Disposition) { \
__exHandled = true; \
WIN_PAL_SEH_RESTORE_GUARD_PAGE
#define WIN_PAL_EXCEPT(Disposition) \
WIN_PAL_TRY_HANDLER_DBG_END \
WIN_PAL_EXCEPT_NAKED(Disposition)
#define WIN_PAL_EXCEPT_FILTER_NAKED(pfnFilter, pvFilterParameter) \
} __except(__exCode = GetExceptionCode(), pfnFilter(GetExceptionInformation(), pvFilterParameter)) { \
__exHandled = true; \
WIN_PAL_SEH_RESTORE_GUARD_PAGE
#define WIN_PAL_EXCEPT_FILTER(pfnFilter, pvFilterParameter) \
WIN_PAL_TRY_HANDLER_DBG_END \
WIN_PAL_EXCEPT_FILTER_NAKED(pfnFilter, pvFilterParameter)
#define WIN_PAL_FINALLY_NAKED \
} __finally { \
#define WIN_PAL_FINALLY \
WIN_PAL_TRY_HANDLER_DBG_END \
WIN_PAL_FINALLY_NAKED
#define WIN_PAL_ENDTRY_NAKED \
} \
} \
#define WIN_PAL_ENDTRY \
} \
WIN_PAL_ENDTRY_NAKED_DBG \
} \
}
#endif // !PAL_WIN_SEH
#if defined(_DEBUG_IMPL) && !defined(JIT_BUILD) && !defined(JIT64_BUILD) && !defined(_ARM_) // @ARMTODO
#define WIN_PAL_TRY_HANDLER_DBG_BEGIN \
BOOL ___oldOkayToThrowValue = FALSE; \
BOOL ___oldSOTolerantState = FALSE; \
ClrDebugState *___pState = GetClrDebugState(); \
__try \
{ \
___oldOkayToThrowValue = ___pState->IsOkToThrow(); \
___oldSOTolerantState = ___pState->IsSOTolerant(); \
___pState->SetOkToThrow(TRUE); \
ANNOTATION_TRY_BEGIN;
// Special version that avoids touching the debug state after doing work in a DllMain for process or thread detach.
#define WIN_PAL_TRY_HANDLER_DBG_BEGIN_DLLMAIN(_reason) \
BOOL ___oldOkayToThrowValue = FALSE; \
BOOL ___oldSOTolerantState = FALSE; \
ClrDebugState *___pState = CheckClrDebugState(); \
__try \
{ \
if (___pState) \
{ \
___oldOkayToThrowValue = ___pState->IsOkToThrow(); \
___oldSOTolerantState = ___pState->IsSOTolerant(); \
___pState->SetOkToThrow(TRUE); \
} \
if ((_reason == DLL_PROCESS_DETACH) || (_reason == DLL_THREAD_DETACH)) \
{ \
___pState = NULL; \
} \
ANNOTATION_TRY_BEGIN;
#define WIN_PAL_TRY_HANDLER_DBG_END \
ANNOTATION_TRY_END; \
} \
__finally \
{ \
if (___pState != NULL) \
{ \
_ASSERTE(___pState == CheckClrDebugState()); \
___pState->SetOkToThrow(___oldOkayToThrowValue); \
___pState->SetSOTolerance(___oldSOTolerantState); \
} \
}
#define WIN_PAL_ENDTRY_NAKED_DBG \
if (__exHandled) \
{ \
RESTORE_SO_TOLERANCE_STATE; \
} \
#else
#define WIN_PAL_TRY_HANDLER_DBG_BEGIN ANNOTATION_TRY_BEGIN;
#define WIN_PAL_TRY_HANDLER_DBG_BEGIN_DLLMAIN(_reason) ANNOTATION_TRY_BEGIN;
#define WIN_PAL_TRY_HANDLER_DBG_END ANNOTATION_TRY_END;
#define WIN_PAL_ENDTRY_NAKED_DBG
#endif // defined(ENABLE_CONTRACTS_IMPL) && !defined(JIT64_BUILD)
#endif // __PALCLR_WIN_H__
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