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 #if defined(__GNUC__) && defined(__i386__) && !defined(__MINGW32__)
  24 /* We'll use this version by default only where we know it helps.
  25
  26    regparm() generates warnings on Solaris boxes.   See SF bug #692878.
  27
  28    Instability reported with egcs on a RedHat Linux 7.3.
  29    Let's comment out:
  30    #define FASTCALL __attribute__((stdcall, regparm(3)))
  31    and let's try this:
  32 */
  33 #define FASTCALL __attribute__((regparm(3)))
  34 #define PTRFASTCALL __attribute__((regparm(3)))
  35 #endif
  36
  37 /* Using __fastcall seems to have an unexpected negative effect under
  38    MS VC++, especially for function pointers, so we won't use it for
  39    now on that platform. It may be reconsidered for a future release
  40    if it can be made more effective.
  41    Likely reason: __fastcall on Windows is like stdcall, therefore
  42    the compiler cannot perform stack optimizations for call clusters.
  43 */
  44
  45 /* Make sure all of these are defined if they aren't already. */
  46
  47 #ifndef FASTCALL
  48 #define FASTCALL
  49 #endif
  50
  51 #ifndef PTRCALL
  52 #define PTRCALL
  53 #endif
  54
  55 #ifndef PTRFASTCALL
  56 #define PTRFASTCALL
  57 #endif
  58
  59 #ifndef XML_MIN_SIZE
  60 #if !defined(__cplusplus) && !defined(inline)
  61 #ifdef __GNUC__
  62 #define inline __inline
  63 #endif /* __GNUC__ */
  64 #endif
  65 #endif /* XML_MIN_SIZE */
  66
  67 #ifdef __cplusplus
  68 #define inline inline
  69 #else
  70 #ifndef inline
  71 #define inline
  72 #endif
  73 #endif