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47 lines
1.2 KiB
C
47 lines
1.2 KiB
C
/*++
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Copyright (c) 2006 Microsoft Corporation
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Module Name:
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tptr.h
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Abstract:
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Support for tagged pointers and other low level pointer manipulation macros.
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Author:
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Leonardo de Moura (leonardo) 2006-09-13.
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Revision History:
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--*/
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#ifndef _TPTR_H_
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#define _TPTR_H_
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#include"machine.h"
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#define TAG_SHIFT PTR_ALIGNMENT
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#define ALIGNMENT_VALUE (1 << PTR_ALIGNMENT)
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#define TAG_MASK (ALIGNMENT_VALUE - 1)
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#define PTR_MASK (~TAG_MASK)
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#define ALIGN(T, PTR) reinterpret_cast<T>(((reinterpret_cast<size_t>(PTR) >> PTR_ALIGNMENT) + \
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static_cast<size_t>((reinterpret_cast<size_t>(PTR) & TAG_MASK) != 0)) << PTR_ALIGNMENT)
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#define UNTAG(T, PTR) reinterpret_cast<T>(reinterpret_cast<size_t>(PTR) & PTR_MASK)
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#define TAG(T, PTR, TAG_VAL) reinterpret_cast<T>(reinterpret_cast<size_t>(PTR) | static_cast<size_t>(TAG_VAL))
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#define GET_TAG(PTR) (reinterpret_cast<size_t>(PTR) & TAG_MASK)
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#define BOXINT(T, VAL) reinterpret_cast<T>(static_cast<size_t>(VAL) << PTR_ALIGNMENT)
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#define BOXTAGINT(T, VAL, TAG_VAL) reinterpret_cast<T>((static_cast<size_t>(VAL) << PTR_ALIGNMENT) | static_cast<size_t>(TAG_VAL))
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#define UNBOXINT(PTR) static_cast<int>(reinterpret_cast<size_t>(PTR) >> PTR_ALIGNMENT)
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#endif /* _TPTR_H_ */
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