forked from KolibriOS/kolibrios
268 lines
6.8 KiB
C
268 lines
6.8 KiB
C
/**************************************************************************
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*
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* Copyright 2007-2008 Tungsten Graphics, Inc., Cedar Park, Texas.
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sub license, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial portions
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* of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
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* IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
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* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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**************************************************************************/
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#ifndef P_COMPILER_H
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#define P_COMPILER_H
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#include "c99_compat.h" /* inline, __func__, etc. */
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#include "p_config.h"
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#include <stdlib.h>
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#include <string.h>
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#include <stddef.h>
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#include <stdarg.h>
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#include <limits.h>
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#if defined(_WIN32) && !defined(__WIN32__)
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#define __WIN32__
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#endif
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#if defined(_MSC_VER)
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/* Avoid 'expression is always true' warning */
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#pragma warning(disable: 4296)
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#endif /* _MSC_VER */
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/*
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* Alternative stdint.h and stdbool.h headers are supplied in include/c99 for
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* systems that lack it.
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*/
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#ifndef __STDC_LIMIT_MACROS
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#define __STDC_LIMIT_MACROS 1
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#endif
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#include <stdint.h>
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#include <stdbool.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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#if !defined(__HAIKU__) && !defined(__USE_MISC)
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#if !defined(PIPE_OS_ANDROID)
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typedef unsigned int uint;
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#endif
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typedef unsigned short ushort;
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#endif
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typedef unsigned char ubyte;
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typedef unsigned char boolean;
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#ifndef TRUE
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#define TRUE true
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#endif
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#ifndef FALSE
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#define FALSE false
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#endif
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#ifndef va_copy
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#ifdef __va_copy
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#define va_copy(dest, src) __va_copy((dest), (src))
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#else
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#define va_copy(dest, src) (dest) = (src)
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#endif
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#endif
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/* XXX: Use standard `inline` keyword instead */
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#ifndef INLINE
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# define INLINE inline
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#endif
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/* Forced function inlining */
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#ifndef ALWAYS_INLINE
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# ifdef __GNUC__
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# define ALWAYS_INLINE inline __attribute__((always_inline))
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# elif defined(_MSC_VER)
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# define ALWAYS_INLINE __forceinline
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# else
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# define ALWAYS_INLINE INLINE
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# endif
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#endif
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/* Function visibility */
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#ifndef PUBLIC
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# if defined(__GNUC__) || (defined(__SUNPRO_C) && (__SUNPRO_C >= 0x590))
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# define PUBLIC __attribute__((visibility("default")))
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# elif defined(_MSC_VER)
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# define PUBLIC __declspec(dllexport)
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# else
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# define PUBLIC
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# endif
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#endif
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/* XXX: Use standard `__func__` instead */
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#ifndef __FUNCTION__
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# define __FUNCTION__ __func__
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#endif
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/* This should match linux gcc cdecl semantics everywhere, so that we
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* just codegen one calling convention on all platforms.
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*/
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#ifdef _MSC_VER
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#define PIPE_CDECL __cdecl
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#else
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#define PIPE_CDECL
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#endif
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#if defined(__GNUC__)
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#define PIPE_DEPRECATED __attribute__((__deprecated__))
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#else
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#define PIPE_DEPRECATED
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#endif
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/* Macros for data alignment. */
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#if defined(__GNUC__) || (defined(__SUNPRO_C) && (__SUNPRO_C >= 0x590)) || defined(__SUNPRO_CC)
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/* See http://gcc.gnu.org/onlinedocs/gcc-4.4.2/gcc/Type-Attributes.html */
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#define PIPE_ALIGN_TYPE(_alignment, _type) _type __attribute__((aligned(_alignment)))
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/* See http://gcc.gnu.org/onlinedocs/gcc-4.4.2/gcc/Variable-Attributes.html */
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#define PIPE_ALIGN_VAR(_alignment) __attribute__((aligned(_alignment)))
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#if (__GNUC__ > 4 || (__GNUC__ == 4 &&__GNUC_MINOR__>1)) && !defined(PIPE_ARCH_X86_64)
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#define PIPE_ALIGN_STACK __attribute__((force_align_arg_pointer))
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#else
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#define PIPE_ALIGN_STACK
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#endif
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#elif defined(_MSC_VER)
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/* See http://msdn.microsoft.com/en-us/library/83ythb65.aspx */
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#define PIPE_ALIGN_TYPE(_alignment, _type) __declspec(align(_alignment)) _type
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#define PIPE_ALIGN_VAR(_alignment) __declspec(align(_alignment))
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#define PIPE_ALIGN_STACK
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#elif defined(SWIG)
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#define PIPE_ALIGN_TYPE(_alignment, _type) _type
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#define PIPE_ALIGN_VAR(_alignment)
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#define PIPE_ALIGN_STACK
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#else
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#error "Unsupported compiler"
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#endif
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#if defined(__GNUC__)
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#define PIPE_READ_WRITE_BARRIER() __asm__("":::"memory")
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#elif defined(_MSC_VER)
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void _ReadWriteBarrier(void);
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#pragma intrinsic(_ReadWriteBarrier)
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#define PIPE_READ_WRITE_BARRIER() _ReadWriteBarrier()
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#elif defined(__SUNPRO_C) || defined(__SUNPRO_CC)
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#define PIPE_READ_WRITE_BARRIER() __machine_rw_barrier()
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#else
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#warning "Unsupported compiler"
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#define PIPE_READ_WRITE_BARRIER() /* */
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#endif
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/* You should use these macros to mark if blocks where the if condition
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* is either likely to be true, or unlikely to be true.
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*
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* This will inform human readers of this fact, and will also inform
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* the compiler, who will in turn inform the CPU.
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*
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* CPUs often start executing code inside the if or the else blocks
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* without knowing whether the condition is true or not, and will have
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* to throw the work away if they find out later they executed the
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* wrong part of the if.
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*
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* If these macros are used, the CPU is more likely to correctly predict
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* the right path, and will avoid speculatively executing the wrong branch,
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* thus not throwing away work, resulting in better performance.
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*
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* In light of this, it is also a good idea to mark as "likely" a path
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* which is not necessarily always more likely, but that will benefit much
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* more from performance improvements since it is already much faster than
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* the other path, or viceversa with "unlikely".
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*
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* Example usage:
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* if(unlikely(do_we_need_a_software_fallback()))
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* do_software_fallback();
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* else
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* render_with_gpu();
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*
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* The macros follow the Linux kernel convention, and more examples can
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* be found there.
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*
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* Note that profile guided optimization can offer better results, but
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* needs an appropriate coverage suite and does not inform human readers.
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*/
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#ifndef likely
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# if defined(__GNUC__)
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# define likely(x) __builtin_expect(!!(x), 1)
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# define unlikely(x) __builtin_expect(!!(x), 0)
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# else
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# define likely(x) (x)
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# define unlikely(x) (x)
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# endif
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#endif
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/**
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* Static (compile-time) assertion.
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* Basically, use COND to dimension an array. If COND is false/zero the
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* array size will be -1 and we'll get a compilation error.
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*/
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#define STATIC_ASSERT(COND) \
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do { \
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(void) sizeof(char [1 - 2*!(COND)]); \
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} while (0)
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#if defined(__cplusplus)
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}
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#endif
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#endif /* P_COMPILER_H */
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