/*
 *  Wrapper typedefs and constants for integer types, also sanity check types.
 *
 *  C99 typedefs are quite good but not always available, and we want to avoid
 *  forcibly redefining the C99 typedefs.  So, there are Duktape wrappers for
 *  all C99 typedefs and Duktape code should only use these typedefs.  Type
 *  detection when C99 is not supported is best effort and may end up detecting
 *  some types incorrectly.
 *
 *  Pointer sizes are a portability problem: pointers to different types may
 *  have a different size and function pointers are very difficult to manage
 *  portably.
 *
 *  http://en.wikipedia.org/wiki/C_data_types#Fixed-width_integer_types
 *
 *  Note: there's an interesting corner case when trying to define minimum
 *  signed integer value constants which leads to the current workaround of
 *  defining e.g. -0x80000000 as (-0x7fffffffL - 1L).  See doc/code-issues.txt
 *  for a longer discussion.
 *
 *  Note: avoid typecasts and computations in macro integer constants as they
 *  can then no longer be used in macro relational expressions (such as
 *  #if DUK_SIZE_MAX < 0xffffffffUL).  There is internal code which relies on
 *  being able to compare DUK_SIZE_MAX against a limit.
 */

/* XXX: add feature options to force basic types from outside? */

#if !defined(INT_MAX)
#error INT_MAX not defined
#endif

/* Check that architecture is two's complement, standard C allows e.g.
 * INT_MIN to be -2**31+1 (instead of -2**31).
 */
#if defined(INT_MAX) && defined(INT_MIN)
#if INT_MAX != -(INT_MIN + 1)
#error platform does not seem complement of two
#endif
#else
#error cannot check complement of two
#endif

/* Pointer size determination based on __WORDSIZE or architecture when
 * that's not available.
 */
#if defined(DUK_F_X86) || defined(DUK_F_X32) || \
    defined(DUK_F_M68K) || defined(DUK_F_PPC32) || \
    defined(DUK_F_BCC) || \
    (defined(__WORDSIZE) && (__WORDSIZE == 32)) || \
    ((defined(DUK_F_OLD_SOLARIS) || defined(DUK_F_AIX) || \
      defined(DUK_F_HPUX)) && defined(_ILP32)) || \
    defined(DUK_F_ARM32)
#define DUK_F_32BIT_PTRS
#elif defined(DUK_F_X64) || \
      (defined(__WORDSIZE) && (__WORDSIZE == 64)) || \
   ((defined(DUK_F_OLD_SOLARIS) || defined(DUK_F_AIX) || \
     defined(DUK_F_HPUX)) && defined(_LP64)) || \
    defined(DUK_F_ARM64)
#define DUK_F_64BIT_PTRS
#else
/* not sure, not needed with C99 anyway */
#endif

/* Intermediate define for 'have inttypes.h' */
#undef DUK_F_HAVE_INTTYPES
#if defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) && \
    !(defined(DUK_F_AMIGAOS) && defined(DUK_F_VBCC))
/* vbcc + AmigaOS has C99 but no inttypes.h */
#define DUK_F_HAVE_INTTYPES
#elif defined(__cplusplus) && (__cplusplus >= 201103L)
/* C++11 apparently ratified stdint.h */
#define DUK_F_HAVE_INTTYPES
#endif

/* Basic integer typedefs and limits, preferably from inttypes.h, otherwise
 * through automatic detection.
 */