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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 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 */
    131