src/expat/lib/internal.h

   1 /* internal.h
   2
   3    Internal definitions used by Expat.  This is not needed to compile
   4    client code.
   5
   6    The following calling convention macros are defined for frequently
   7    called functions:
   8
   9    FASTCALL    - Used for those internal functions that have a simple
  10                  body and a low number of arguments and local variables.
  11
  12    PTRCALL     - Used for functions called though function pointers.
  13
  14    PTRFASTCALL - Like PTRCALL, but for low number of arguments.
  15
  16    inline      - Used for selected internal functions for which inlining
  17                  may improve performance on some platforms.
  18
  19    Note: Use of these macros is based on judgement, not hard rules,
  20          and therefore subject to change.
  21 */
  22
  23 #ifdef FASTCALL
  24 #undef FASTCALL
  25 #endif
  26
  27 #if defined(__GNUC__) && defined(__i386__)
  28 /* Instability reported with egcs on a RedHat Linux 7.3.
  29    Let's comment it out:
  30    #define FASTCALL __attribute__((stdcall, regparm(3)))
  31    and let's try this:
  32 */
  33 #define FASTCALL __attribute__((regparm(3)))
  34 #define PTRCALL
  35 #define PTRFASTCALL __attribute__((regparm(3)))
  36
  37 #elif defined(WIN32)
  38 /* Using __fastcall seems to have an unexpected negative effect under
  39    MS VC++, especially for function pointers, so we won't use it for
  40    now on that platform. It may be reconsidered for a future release
  41    if it can be made more effective.
  42    Likely reason: __fastcall on Windows is like stdcall, therefore
  43    the compiler cannot perform stack optimizations for call clusters.
  44 */
  45 #define FASTCALL
  46 #define PTRCALL
  47 #define PTRFASTCALL
  48
  49 #endif
  50
  51 #ifndef FASTCALL
  52 #define FASTCALL
  53 #endif
  54
  55 #ifndef PTRCALL
  56 #define PTRCALL
  57 #endif
  58
  59 #ifndef PTRFASTCALL
  60 #define PTRFASTCALL
  61 #endif
  62
  63 #ifndef XML_MIN_SIZE
  64 #if !defined(__cplusplus) && !defined(inline)
  65 #ifdef __GNUC__
  66 #define inline __inline
  67 #endif /* __GNUC__ */
  68 #endif
  69 #endif /* XML_MIN_SIZE */
  70
  71 #ifdef __cplusplus
  72 #define inline inline
  73 #else
  74 #ifndef inline
  75 #define inline
  76 #endif
  77 #endif