src/gallium/auxiliary/util/u_pointer.h

   1 /**************************************************************************
   2  *
   3  * Copyright 2007-2008 VMware, Inc.
   4  * All Rights Reserved.
   5  *
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   7  * copy of this software and associated documentation files (the
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  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
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  26  **************************************************************************/
  27
  28 #ifndef U_POINTER_H
  29 #define U_POINTER_H
  30
  31 #include "pipe/p_compiler.h"
  32
  33 #ifdef __cplusplus
  34 extern "C" {
  35 #endif
  36
  37 static inline intptr_t
  38 pointer_to_intptr( const void *p )
  39 {
  40    union {
  41       const void *p;
  42       intptr_t i;
  43    } pi;
  44    pi.p = p;
  45    return pi.i;
  46 }
  47
  48 static inline void *
  49 intptr_to_pointer( intptr_t i )
  50 {
  51    union {
  52       void *p;
  53       intptr_t i;
  54    } pi;
  55    pi.i = i;
  56    return pi.p;
  57 }
  58
  59 static inline uintptr_t
  60 pointer_to_uintptr( const void *ptr )
  61 {
  62    union {
  63       const void *p;
  64       uintptr_t u;
  65    } pu;
  66    pu.p = ptr;
  67    return pu.u;
  68 }
  69
  70 static inline void *
  71 uintptr_to_pointer( uintptr_t u )
  72 {
  73    union {
  74       void *p;
  75       uintptr_t u;
  76    } pu;
  77    pu.u = u;
  78    return pu.p;
  79 }
  80
  81 /**
  82  * Return a pointer aligned to next multiple of N bytes.
  83  */
  84 static inline void *
  85 align_pointer( const void *unaligned, uintptr_t alignment )
  86 {
  87    uintptr_t aligned = (pointer_to_uintptr( unaligned ) + alignment - 1) & ~(alignment - 1);
  88    return uintptr_to_pointer( aligned );
  89 }
  90
  91
  92 /**
  93  * Return a pointer aligned to next multiple of 16 bytes.
  94  */
  95 static inline void *
  96 align16( void *unaligned )
  97 {
  98    return align_pointer( unaligned, 16 );
  99 }
 100
 101 typedef void (*func_pointer)(void);
 102
 103 static inline func_pointer
 104 pointer_to_func( void *p )
 105 {
 106    union {
 107       void *p;
 108       func_pointer f;
 109    } pf;
 110    pf.p = p;
 111    return pf.f;
 112 }
 113
 114 static inline void *
 115 func_to_pointer( func_pointer f )
 116 {
 117    union {
 118       void *p;
 119       func_pointer f;
 120    } pf;
 121    pf.f = f;
 122    return pf.p;
 123 }
 124
 125
 126 #ifdef __cplusplus
 127 }
 128 #endif
 129
 130 #endif /* U_POINTER_H */