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| 1 | /* Copyright (C) 2002 Jean-Marc Valin */ | ||
| 2 | /** | ||
| 3 | @file stack_alloc.h | ||
| 4 | @brief Temporary memory allocation on stack | ||
| 5 | */ | ||
| 6 | /* | ||
| 7 | Redistribution and use in source and binary forms, with or without | ||
| 8 | modification, are permitted provided that the following conditions | ||
| 9 | are met: | ||
| 10 | |||
| 11 | - Redistributions of source code must retain the above copyright | ||
| 12 | notice, this list of conditions and the following disclaimer. | ||
| 13 | |||
| 14 | - Redistributions in binary form must reproduce the above copyright | ||
| 15 | notice, this list of conditions and the following disclaimer in the | ||
| 16 | documentation and/or other materials provided with the distribution. | ||
| 17 | |||
| 18 | - Neither the name of the Xiph.org Foundation nor the names of its | ||
| 19 | contributors may be used to endorse or promote products derived from | ||
| 20 | this software without specific prior written permission. | ||
| 21 | |||
| 22 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | ||
| 23 | ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | ||
| 24 | LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | ||
| 25 | A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR | ||
| 26 | CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, | ||
| 27 | EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, | ||
| 28 | PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR | ||
| 29 | PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF | ||
| 30 | LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING | ||
| 31 | NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS | ||
| 32 | SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | ||
| 33 | */ | ||
| 34 | |||
| 35 | #ifndef STACK_ALLOC_H | ||
| 36 | #define STACK_ALLOC_H | ||
| 37 | |||
| 38 | #ifdef WIN32 | ||
| 39 | # include <malloc.h> | ||
| 40 | #else | ||
| 41 | # ifdef HAVE_ALLOCA_H | ||
| 42 | # include <alloca.h> | ||
| 43 | # else | ||
| 44 | # include <stdlib.h> | ||
| 45 | # endif | ||
| 46 | #endif | ||
| 47 | |||
| 48 | /** | ||
| 49 | * @def ALIGN(stack, size) | ||
| 50 | * | ||
| 51 | * Aligns the stack to a 'size' boundary | ||
| 52 | * | ||
| 53 | * @param stack Stack | ||
| 54 | * @param size New size boundary | ||
| 55 | */ | ||
| 56 | |||
| 57 | /** | ||
| 58 | * @def PUSH(stack, size, type) | ||
| 59 | * | ||
| 60 | * Allocates 'size' elements of type 'type' on the stack | ||
| 61 | * | ||
| 62 | * @param stack Stack | ||
| 63 | * @param size Number of elements | ||
| 64 | * @param type Type of element | ||
| 65 | */ | ||
| 66 | |||
| 67 | /** | ||
| 68 | * @def VARDECL(var) | ||
| 69 | * | ||
| 70 | * Declare variable on stack | ||
| 71 | * | ||
| 72 | * @param var Variable to declare | ||
| 73 | */ | ||
| 74 | |||
| 75 | /** | ||
| 76 | * @def ALLOC(var, size, type) | ||
| 77 | * | ||
| 78 | * Allocate 'size' elements of 'type' on stack | ||
| 79 | * | ||
| 80 | * @param var Name of variable to allocate | ||
| 81 | * @param size Number of elements | ||
| 82 | * @param type Type of element | ||
| 83 | */ | ||
| 84 | |||
| 85 | #ifdef ENABLE_VALGRIND | ||
| 86 | |||
| 87 | #include <valgrind/memcheck.h> | ||
| 88 | |||
| 89 | #define ALIGN(stack, size) ((stack) += ((size) - (long)(stack)) & ((size) - 1)) | ||
| 90 | |||
| 91 | #define PUSH(stack, size, type) (VALGRIND_MAKE_NOACCESS(stack, 1000),ALIGN((stack),sizeof(type)),VALGRIND_MAKE_WRITABLE(stack, ((size)*sizeof(type))),(stack)+=((size)*sizeof(type)),(type*)((stack)-((size)*sizeof(type)))) | ||
| 92 | |||
| 93 | #else | ||
| 94 | |||
| 95 | #define ALIGN(stack, size) ((stack) += ((size) - (long)(stack)) & ((size) - 1)) | ||
| 96 | |||
| 97 | #define PUSH(stack, size, type) (ALIGN((stack),sizeof(type)),(stack)+=((size)*sizeof(type)),(type*)((stack)-((size)*sizeof(type)))) | ||
| 98 | |||
| 99 | #endif | ||
| 100 | |||
| 101 | #if defined(VAR_ARRAYS) | ||
| 102 | #define VARDECL(var) | ||
| 103 | #define ALLOC(var, size, type) type var[size] | ||
| 104 | #elif defined(USE_ALLOCA) | ||
| 105 | #define VARDECL(var) var | ||
| 106 | #define ALLOC(var, size, type) var = alloca(sizeof(type)*(size)) | ||
| 107 | #else | ||
| 108 | #define VARDECL(var) var | ||
| 109 | #define ALLOC(var, size, type) var = PUSH(stack, size, type) | ||
| 110 | #endif | ||
| 111 | |||
| 112 | |||
| 113 | #endif | ||