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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.
//
// TLS.H -
//
//
// Encapsulates TLS access for maximum performance.
//
#ifndef __tls_h__
#define __tls_h__
#ifdef FEATURE_IMPLICIT_TLS
#ifdef _WIN64
#define OFFSETOF__TLS__tls_CurrentThread 0x08
#define OFFSETOF__TLS__tls_EETlsData 0x18
#else
#define OFFSETOF__TLS__tls_CurrentThread 0x04
#define OFFSETOF__TLS__tls_EETlsData 0x0c
#endif // _WIN64
#ifdef _TARGET_WIN64_
#define WINNT_OFFSETOF__TEB__ThreadLocalStoragePointer 0x58
#else
#define WINNT_OFFSETOF__TEB__ThreadLocalStoragePointer 0x2c
#endif
#endif // FEATURE_IMPLICIT_TLS
// Pointer to a function that retrieves the TLS data for a specific index.
typedef LPVOID (*POPTIMIZEDTLSGETTER)();
//---------------------------------------------------------------------------
// Creates a platform-optimized version of TlsGetValue compiled
// for a particular index. Can return NULL - the caller should substitute
// a non-optimized getter in this case.
//---------------------------------------------------------------------------
POPTIMIZEDTLSGETTER MakeOptimizedTlsGetter(DWORD tlsIndex, LPVOID pBuffer = NULL, SIZE_T cbBuffer = 0, POPTIMIZEDTLSGETTER pGenericImpl = NULL, BOOL fForceGeneric = FALSE);
//---------------------------------------------------------------------------
// Frees a function created by MakeOptimizedTlsGetter().
//---------------------------------------------------------------------------
VOID FreeOptimizedTlsGetter(POPTIMIZEDTLSGETTER pOptimizedTlsGetter);
//---------------------------------------------------------------------------
// For ASM stub generators that want to inline Thread access for efficiency,
// the Thread manager uses these constants to define how to access the Thread.
//---------------------------------------------------------------------------
enum TLSACCESSMODE {
TLSACCESS_GENERIC = 1, // Make no platform assumptions: use the API
// TLS
TLSACCESS_WNT = 2, // WinNT-style TLS
TLSACCESS_WNT_HIGH = 3, // WinNT5-style TLS, slot > TLS_MINIMUM_AVAILABLE
};
//---------------------------------------------------------------------------
// WinNT store the TLS in different places relative to the
// fs:[0]. This api reveals which. Can also return TLSACCESS_GENERIC if
// no info is available about the Thread location (you have to use the TlsGetValue
// api.) This is intended for use by stub generators that want to inline TLS
// access.
//---------------------------------------------------------------------------
TLSACCESSMODE GetTLSAccessMode(DWORD tlsIndex);
#endif // __tls_h__
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