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      1 /**************************************************************************
      2  *
      3  * Copyright 2007-2008 VMware, Inc.
      4  * All Rights Reserved.
      5  *
      6  * Permission is hereby granted, free of charge, to any person obtaining a
      7  * copy of this software and associated documentation files (the
      8  * "Software"), to deal in the Software without restriction, including
      9  * without limitation the rights to use, copy, modify, merge, publish,
     10  * distribute, sub license, and/or sell copies of the Software, and to
     11  * permit persons to whom the Software is furnished to do so, subject to
     12  * the following conditions:
     13  *
     14  * The above copyright notice and this permission notice (including the
     15  * next paragraph) shall be included in all copies or substantial portions
     16  * of the Software.
     17  *
     18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
     19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
     20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
     21  * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
     22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
     23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
     24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
     25  *
     26  **************************************************************************/
     27 
     28 #ifndef P_COMPILER_H
     29 #define P_COMPILER_H
     30 
     31 
     32 #include "c99_compat.h" /* inline, __func__, etc. */
     33 
     34 #include "p_config.h"
     35 
     36 #include "util/macros.h"
     37 
     38 #include <stdlib.h>
     39 #include <string.h>
     40 #include <stddef.h>
     41 #include <stdarg.h>
     42 #include <limits.h>
     43 
     44 
     45 #if defined(_WIN32) && !defined(__WIN32__)
     46 #define __WIN32__
     47 #endif
     48 
     49 #if defined(_MSC_VER)
     50 
     51 #include <intrin.h>
     52 
     53 /* Avoid 'expression is always true' warning */
     54 #pragma warning(disable: 4296)
     55 
     56 #endif /* _MSC_VER */
     57 
     58 
     59 /*
     60  * Alternative stdint.h and stdbool.h headers are supplied in include/c99 for
     61  * systems that lack it.
     62  */
     63 #include <stdint.h>
     64 #include <stdbool.h>
     65 
     66 
     67 #ifdef __cplusplus
     68 extern "C" {
     69 #endif
     70 
     71 
     72 #if !defined(__HAIKU__) && !defined(__USE_MISC) && !defined(_NETBSD_SOURCE)
     73 #if !defined(PIPE_OS_ANDROID)
     74 typedef unsigned int       uint;
     75 #endif
     76 typedef unsigned short     ushort;
     77 #endif
     78 typedef unsigned char      ubyte;
     79 
     80 typedef unsigned char boolean;
     81 #ifndef TRUE
     82 #define TRUE  true
     83 #endif
     84 #ifndef FALSE
     85 #define FALSE false
     86 #endif
     87 
     88 #ifndef va_copy
     89 #ifdef __va_copy
     90 #define va_copy(dest, src) __va_copy((dest), (src))
     91 #else
     92 #define va_copy(dest, src) (dest) = (src)
     93 #endif
     94 #endif
     95 
     96 
     97 /* XXX: Use standard `__func__` instead */
     98 #ifndef __FUNCTION__
     99 #  define __FUNCTION__ __func__
    100 #endif
    101 
    102 
    103 /* This should match linux gcc cdecl semantics everywhere, so that we
    104  * just codegen one calling convention on all platforms.
    105  */
    106 #ifdef _MSC_VER
    107 #define PIPE_CDECL __cdecl
    108 #else
    109 #define PIPE_CDECL
    110 #endif
    111 
    112 
    113 
    114 #if defined(__GNUC__)
    115 #define PIPE_DEPRECATED  __attribute__((__deprecated__))
    116 #else
    117 #define PIPE_DEPRECATED
    118 #endif
    119 
    120 
    121 
    122 /* Macros for data alignment. */
    123 #if defined(__GNUC__)
    124 
    125 /* See http://gcc.gnu.org/onlinedocs/gcc-4.4.2/gcc/Type-Attributes.html */
    126 #define PIPE_ALIGN_TYPE(_alignment, _type) _type __attribute__((aligned(_alignment)))
    127 
    128 /* See http://gcc.gnu.org/onlinedocs/gcc-4.4.2/gcc/Variable-Attributes.html */
    129 #define PIPE_ALIGN_VAR(_alignment) __attribute__((aligned(_alignment)))
    130 
    131 #if defined(__GNUC__) && defined(PIPE_ARCH_X86)
    132 #define PIPE_ALIGN_STACK __attribute__((force_align_arg_pointer))
    133 #else
    134 #define PIPE_ALIGN_STACK
    135 #endif
    136 
    137 #elif defined(_MSC_VER)
    138 
    139 /* See http://msdn.microsoft.com/en-us/library/83ythb65.aspx */
    140 #define PIPE_ALIGN_TYPE(_alignment, _type) __declspec(align(_alignment)) _type
    141 #define PIPE_ALIGN_VAR(_alignment) __declspec(align(_alignment))
    142 
    143 #define PIPE_ALIGN_STACK
    144 
    145 #elif defined(SWIG) || defined(__lint__)
    146 
    147 #define PIPE_ALIGN_TYPE(_alignment, _type) _type
    148 #define PIPE_ALIGN_VAR(_alignment)
    149 
    150 #define PIPE_ALIGN_STACK
    151 
    152 #else
    153 
    154 #error "Unsupported compiler"
    155 
    156 #endif
    157 
    158 /**
    159  * Declare a variable on its own cache line.
    160  *
    161  * This helps eliminate "False sharing" to make atomic operations
    162  * on pipe_reference::count faster and/or access to adjacent fields faster.
    163  *
    164  * https://en.wikipedia.org/wiki/False_sharing
    165  *
    166  * CALLOC_STRUCT_CL or MALLOC_STRUCT_CL and FREE_CL should be used to allocate
    167  * structures that contain this.
    168  *
    169  * NOTE: Don't use PIPE_ALIGN_VAR because it causes the whole structure to be
    170  *       aligned, but we only want to align the field.
    171  */
    172 #define EXCLUSIVE_CACHELINE(decl) \
    173    union { char __cl_space[CACHE_LINE_SIZE]; \
    174            decl; }
    175 
    176 #if defined(__GNUC__)
    177 
    178 #define PIPE_READ_WRITE_BARRIER() __asm__("":::"memory")
    179 
    180 #elif defined(_MSC_VER)
    181 
    182 #define PIPE_READ_WRITE_BARRIER() _ReadWriteBarrier()
    183 
    184 #elif defined(__lint__)
    185 
    186 #define PIPE_READ_WRITE_BARRIER() /* */
    187 
    188 #else
    189 
    190 #warning "Unsupported compiler"
    191 #define PIPE_READ_WRITE_BARRIER() /* */
    192 
    193 #endif
    194 
    195 #if defined(__cplusplus)
    196 }
    197 #endif
    198 
    199 
    200 #endif /* P_COMPILER_H */
    201