79 lines
2.8 KiB
C
79 lines
2.8 KiB
C
/*
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* Wrapper typedefs and constants for integer types, also sanity check types.
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*
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* C99 typedefs are quite good but not always available, and we want to avoid
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* forcibly redefining the C99 typedefs. So, there are Duktape wrappers for
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* all C99 typedefs and Duktape code should only use these typedefs. Type
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* detection when C99 is not supported is best effort and may end up detecting
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* some types incorrectly.
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*
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* Pointer sizes are a portability problem: pointers to different types may
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* have a different size and function pointers are very difficult to manage
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* portably.
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*
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* http://en.wikipedia.org/wiki/C_data_types#Fixed-width_integer_types
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*
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* Note: there's an interesting corner case when trying to define minimum
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* signed integer value constants which leads to the current workaround of
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* defining e.g. -0x80000000 as (-0x7fffffffL - 1L). See doc/code-issues.txt
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* for a longer discussion.
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*
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* Note: avoid typecasts and computations in macro integer constants as they
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* can then no longer be used in macro relational expressions (such as
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* #if DUK_SIZE_MAX < 0xffffffffUL). There is internal code which relies on
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* being able to compare DUK_SIZE_MAX against a limit.
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*/
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/* XXX: add feature options to force basic types from outside? */
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#if !defined(INT_MAX)
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#error INT_MAX not defined
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#endif
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/* Check that architecture is two's complement, standard C allows e.g.
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* INT_MIN to be -2**31+1 (instead of -2**31).
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*/
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#if defined(INT_MAX) && defined(INT_MIN)
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#if INT_MAX != -(INT_MIN + 1)
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#error platform does not seem complement of two
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#endif
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#else
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#error cannot check complement of two
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#endif
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/* Pointer size determination based on __WORDSIZE or architecture when
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* that's not available.
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*/
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#if defined(DUK_F_X86) || defined(DUK_F_X32) || \
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defined(DUK_F_M68K) || defined(DUK_F_PPC32) || \
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defined(DUK_F_BCC) || \
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(defined(__WORDSIZE) && (__WORDSIZE == 32)) || \
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((defined(DUK_F_OLD_SOLARIS) || defined(DUK_F_AIX) || \
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defined(DUK_F_HPUX)) && defined(_ILP32)) || \
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defined(DUK_F_ARM32)
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#define DUK_F_32BIT_PTRS
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#elif defined(DUK_F_X64) || \
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(defined(__WORDSIZE) && (__WORDSIZE == 64)) || \
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((defined(DUK_F_OLD_SOLARIS) || defined(DUK_F_AIX) || \
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defined(DUK_F_HPUX)) && defined(_LP64)) || \
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defined(DUK_F_ARM64)
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#define DUK_F_64BIT_PTRS
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#else
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/* not sure, not needed with C99 anyway */
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#endif
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/* Intermediate define for 'have inttypes.h' */
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#undef DUK_F_HAVE_INTTYPES
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#if defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) && \
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!(defined(DUK_F_AMIGAOS) && defined(DUK_F_VBCC))
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/* vbcc + AmigaOS has C99 but no inttypes.h */
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#define DUK_F_HAVE_INTTYPES
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#elif defined(__cplusplus) && (__cplusplus >= 201103L)
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/* C++11 apparently ratified stdint.h */
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#define DUK_F_HAVE_INTTYPES
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#endif
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/* Basic integer typedefs and limits, preferably from inttypes.h, otherwise
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* through automatic detection.
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*/
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