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//
// Copyright (c) Microsoft. All rights reserved.
// Licensed under the MIT license. See LICENSE file in the project root for full license information.
//
// ===========================================================================
// File: mixedmode.H
//
//
// MIXEDMODE.H defines classes to support mixed mode dlls
// ===========================================================================
#ifndef _MIXEDMODE_H_
#define _MIXEDMODE_H_
#ifdef FEATURE_MIXEDMODE
#ifdef _TARGET_X86_
extern "C" VOID __stdcall IJWNOADThunkJumpTarget(void);
#endif
#define IJWNOADThunkStubCacheSize 4
struct IJWNOADThunkStubCache
{
ADID m_AppDomainID; // Must be the first member of the struct.
LPCVOID m_CodeAddr;
};
// Be sure to keep this structure and the assembly view in sync
class IJWNOADThunk
{
UMEntryThunkCode m_code;
protected:
static void __cdecl MakeCall();
static void SafeNoModule();
static void NoModule();
HMODULE m_pModulebase;
DWORD m_dwIndex;
mdToken m_Token;
DWORD m_fAccessingCache;
public:
IJWNOADThunkStubCache m_cache[IJWNOADThunkStubCacheSize];
BOOL IsCachedAppDomainID(ADID pID)
{
LIMITED_METHOD_CONTRACT;
for (int i=0; i < IJWNOADThunkStubCacheSize; i++)
{
if (m_cache[i].m_AppDomainID == pID)
return TRUE;
}
return FALSE;
};
void GetCachedInfo(ADID pID, LPCVOID* pCode)
{
CONTRACTL
{
NOTHROW;
GC_NOTRIGGER;
MODE_ANY;
INSTANCE_CHECK;
SO_TOLERANT;
PRECONDITION(CheckPointer(pCode));
}
CONTRACTL_END;
*pCode = NULL;
for (int i=0; i < IJWNOADThunkStubCacheSize; i++)
{
if (m_cache[i].m_AppDomainID == pID)
*pCode = m_cache[i].m_CodeAddr;
}
}
void SetCachedInfo(ADID pID, LPCVOID pCode)
{
CONTRACTL
{
THROWS;
GC_NOTRIGGER;
MODE_ANY;
INSTANCE_CHECK;
SO_INTOLERANT;
}
CONTRACTL_END;
YIELD_WHILE (FastInterlockCompareExchange((LONG*)&m_fAccessingCache, 1, 0) != 0);
// Don't cache if the cache is already full.
for (int i=0; i < IJWNOADThunkStubCacheSize; i++)
{
if (m_cache[i].m_AppDomainID == (ADID)-1)
{
m_cache[i].m_CodeAddr = pCode;
MemoryBarrier();
m_cache[i].m_AppDomainID = pID;
}
}
m_fAccessingCache = 0;
}
static IJWNOADThunk* FromCode(PCODE pCodeAddr)
{
LIMITED_METHOD_CONTRACT;
return (IJWNOADThunk*)(PCODEToPINSTR(pCodeAddr) - offsetof(IJWNOADThunk, m_code) - UMEntryThunkCode::GetEntryPointOffset());
};
mdToken GetToken()
{
LIMITED_METHOD_CONTRACT;
return m_Token;
}
IJWNOADThunk(HMODULE pModulebase, DWORD dwIndex, mdToken Token);
LPCBYTE GetCode()
{
WRAPPER_NO_CONTRACT;
return m_code.GetEntryPoint();
}
LPCVOID IJWNOADThunk::FindThunkTarget();
};
#endif //FEATURE_MIXEDMODE
#endif // _MIXEDMODE_H_
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