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40 lines
1.4 KiB
40 lines
1.4 KiB
/*
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* Check whether or not a packed duk_tval representation is possible.
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* What's basically required is that pointers are 32-bit values
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* (sizeof(void *) == 4). Best effort check, not always accurate.
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* If guess goes wrong, crashes may result; self tests also verify
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* the guess.
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*/
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/* Explicit marker needed; may be 'defined', 'undefined, 'or 'not provided'. */
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#if !defined(DUK_F_PACKED_TVAL_PROVIDED)
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#undef DUK_F_PACKED_TVAL_POSSIBLE
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/* Strict C99 case: DUK_UINTPTR_MAX (= UINTPTR_MAX) should be very reliable */
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#if !defined(DUK_F_PACKED_TVAL_POSSIBLE) && defined(DUK_UINTPTR_MAX)
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#if (DUK_UINTPTR_MAX <= 0xffffffffUL)
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#define DUK_F_PACKED_TVAL_POSSIBLE
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#endif
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#endif
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/* Non-C99 case, still relying on DUK_UINTPTR_MAX, as long as it is not a computed value */
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#if !defined(DUK_F_PACKED_TVAL_POSSIBLE) && defined(DUK_UINTPTR_MAX) && !defined(DUK_UINTPTR_MAX_COMPUTED)
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#if (DUK_UINTPTR_MAX <= 0xffffffffUL)
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#define DUK_F_PACKED_TVAL_POSSIBLE
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#endif
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#endif
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/* DUK_SIZE_MAX (= SIZE_MAX) is often reliable */
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#if !defined(DUK_F_PACKED_TVAL_POSSIBLE) && defined(DUK_SIZE_MAX) && !defined(DUK_SIZE_MAX_COMPUTED)
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#if (DUK_SIZE_MAX <= 0xffffffffUL)
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#define DUK_F_PACKED_TVAL_POSSIBLE
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#endif
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#endif
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#undef DUK_USE_PACKED_TVAL
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#if defined(DUK_F_PACKED_TVAL_POSSIBLE)
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#define DUK_USE_PACKED_TVAL
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#endif
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#undef DUK_F_PACKED_TVAL_POSSIBLE
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#endif /* DUK_F_PACKED_TVAL_PROVIDED */
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