| 1 | /* internal.h
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| 2 |
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| 3 | Internal definitions used by Expat. This is not needed to compile
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| 4 | client code.
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| 5 |
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| 6 | The following calling convention macros are defined for frequently
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| 7 | called functions:
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| 8 |
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| 9 | FASTCALL - Used for those internal functions that have a simple
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| 10 | body and a low number of arguments and local variables.
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| 11 |
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| 12 | PTRCALL - Used for functions called though function pointers.
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| 13 |
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| 14 | PTRFASTCALL - Like PTRCALL, but for low number of arguments.
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| 15 |
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| 16 | inline - Used for selected internal functions for which inlining
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| 17 | may improve performance on some platforms.
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| 18 |
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| 19 | Note: Use of these macros is based on judgement, not hard rules,
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| 20 | and therefore subject to change.
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| 21 | */
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| 22 |
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| 23 | #if defined(__GNUC__) && defined(__i386__)
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| 24 | /* We'll use this version by default only where we know it helps.
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| 25 |
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| 26 | regparm() generates warnings on Solaris boxes. See SF bug #692878.
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| 27 |
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| 28 | Instability reported with egcs on a RedHat Linux 7.3.
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| 29 | Let's comment out:
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| 30 | #define FASTCALL __attribute__((stdcall, regparm(3)))
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| 31 | and let's try this:
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| 32 | */
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| 33 | #define FASTCALL __attribute__((regparm(3)))
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| 34 | #define PTRFASTCALL __attribute__((regparm(3)))
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| 35 | #endif
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| 36 |
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| 37 | /* Using __fastcall seems to have an unexpected negative effect under
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| 38 | MS VC++, especially for function pointers, so we won't use it for
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| 39 | now on that platform. It may be reconsidered for a future release
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| 40 | if it can be made more effective.
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| 41 | Likely reason: __fastcall on Windows is like stdcall, therefore
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| 42 | the compiler cannot perform stack optimizations for call clusters.
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| 43 | */
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| 44 |
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| 45 | /* Make sure all of these are defined if they aren't already. */
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| 46 |
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| 47 | #ifndef FASTCALL
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| 48 | #define FASTCALL
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| 49 | #endif
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| 50 |
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| 51 | #ifndef PTRCALL
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| 52 | #define PTRCALL
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| 53 | #endif
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| 54 |
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