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 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
pointer_to_intptr(const void * p)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 *
intptr_to_pointer(intptr_t i)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
pointer_to_uintptr(const void * ptr)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 *
uintptr_to_pointer(uintptr_t u)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 *
align_pointer(const void * unaligned,uintptr_t alignment)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 *
align16(void * unaligned)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
pointer_to_func(void * p)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 *
func_to_pointer(func_pointer f)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 */
131