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4358 | Serge | 1 | /************************************************************************** |
2 | * |
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3 | * Copyright 2007-2008 Tungsten Graphics, Inc., Cedar Park, Texas. |
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4 | * All Rights Reserved. |
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5 | * |
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6 | * Permission is hereby granted, free of charge, to any person obtaining a |
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7 | * copy of this software and associated documentation files (the |
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8 | * "Software"), to deal in the Software without restriction, including |
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9 | * without limitation the rights to use, copy, modify, merge, publish, |
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10 | * distribute, sub license, and/or sell copies of the Software, and to |
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11 | * permit persons to whom the Software is furnished to do so, subject to |
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12 | * the following conditions: |
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13 | * |
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14 | * The above copyright notice and this permission notice (including the |
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15 | * next paragraph) shall be included in all copies or substantial portions |
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16 | * of the Software. |
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17 | * |
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18 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
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19 | * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
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20 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. |
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21 | * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR |
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22 | * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, |
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23 | * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE |
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24 | * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
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25 | * |
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26 | **************************************************************************/ |
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27 | |||
28 | #ifndef U_POINTER_H |
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29 | #define U_POINTER_H |
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30 | |||
31 | #include "pipe/p_compiler.h" |
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32 | |||
33 | #ifdef __cplusplus |
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34 | extern "C" { |
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35 | #endif |
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36 | |||
37 | static INLINE intptr_t |
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38 | pointer_to_intptr( const void *p ) |
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39 | { |
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40 | union { |
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41 | const void *p; |
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42 | intptr_t i; |
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43 | } pi; |
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44 | pi.p = p; |
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45 | return pi.i; |
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46 | } |
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47 | |||
48 | static INLINE void * |
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49 | intptr_to_pointer( intptr_t i ) |
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50 | { |
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51 | union { |
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52 | void *p; |
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53 | intptr_t i; |
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54 | } pi; |
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55 | pi.i = i; |
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56 | return pi.p; |
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57 | } |
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58 | |||
59 | static INLINE uintptr_t |
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60 | pointer_to_uintptr( const void *ptr ) |
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61 | { |
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62 | union { |
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63 | const void *p; |
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64 | uintptr_t u; |
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65 | } pu; |
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66 | pu.p = ptr; |
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67 | return pu.u; |
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68 | } |
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69 | |||
70 | static INLINE void * |
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71 | uintptr_to_pointer( uintptr_t u ) |
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72 | { |
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73 | union { |
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74 | void *p; |
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75 | uintptr_t u; |
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76 | } pu; |
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77 | pu.u = u; |
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78 | return pu.p; |
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79 | } |
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80 | |||
81 | /** |
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82 | * Return a pointer aligned to next multiple of N bytes. |
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83 | */ |
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84 | static INLINE void * |
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85 | align_pointer( const void *unaligned, uintptr_t alignment ) |
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86 | { |
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87 | uintptr_t aligned = (pointer_to_uintptr( unaligned ) + alignment - 1) & ~(alignment - 1); |
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88 | return uintptr_to_pointer( aligned ); |
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89 | } |
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90 | |||
91 | |||
92 | /** |
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93 | * Return a pointer aligned to next multiple of 16 bytes. |
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94 | */ |
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95 | static INLINE void * |
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96 | align16( void *unaligned ) |
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97 | { |
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98 | return align_pointer( unaligned, 16 ); |
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99 | } |
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100 | |||
101 | typedef void (*func_pointer)(void); |
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102 | |||
103 | static INLINE func_pointer |
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104 | pointer_to_func( void *p ) |
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105 | { |
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106 | union { |
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107 | void *p; |
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108 | func_pointer f; |
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109 | } pf; |
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110 | pf.p = p; |
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111 | return pf.f; |
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112 | } |
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113 | |||
114 | static INLINE void * |
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115 | func_to_pointer( func_pointer f ) |
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116 | { |
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117 | union { |
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118 | void *p; |
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119 | func_pointer f; |
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120 | } pf; |
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121 | pf.f = f; |
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122 | return pf.p; |
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123 | } |
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124 | |||
125 | |||
126 | #ifdef __cplusplus |
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127 | } |
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128 | #endif |
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129 | |||
130 | #endif /* U_POINTER_H */ |