27 lines
1 KiB
C
27 lines
1 KiB
C
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/*
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* Alignment requirement and support for unaligned accesses
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*
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* Assume unaligned accesses are not supported unless specifically allowed
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* in the target platform. Some platforms may support unaligned accesses
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* but alignment to 4 or 8 may still be desirable. Note that unaligned
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* accesses (and even pointers) relative to natural alignment (regardless
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* of target alignment) are technically undefined behavior and thus
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* compiler/architecture specific.
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*/
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/* If not forced, use safe default for alignment. */
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#if !defined(DUK_USE_ALIGN_BY)
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#define DUK_USE_ALIGN_BY 8
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#endif
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/* Compiler specific hackery needed to force struct size to match alignment,
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* see e.g. duk_hbuffer.h.
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*
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* http://stackoverflow.com/questions/11130109/c-struct-size-alignment
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* http://stackoverflow.com/questions/10951039/specifying-64-bit-alignment
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*/
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#if !(defined(DUK_USE_PACK_MSVC_PRAGMA) || defined(DUK_USE_PACK_GCC_ATTR) || \
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defined(DUK_USE_PACK_CLANG_ATTR) || defined(DUK_USE_PACK_DUMMY_MEMBER))
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#define DUK_USE_PACK_DUMMY_MEMBER
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#endif
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