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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 | |