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 USE_ALLOCA 39 # ifdef WIN32 40 # include <malloc.h> 41 # else 42 # ifdef HAVE_ALLOCA_H 43 # include <alloca.h> 44 # else 45 # include <stdlib.h> 46 # endif 47 # endif 48 #endif 49 50 /** 51 * @def ALIGN(stack, size) 52 * 53 * Aligns the stack to a 'size' boundary 54 * 55 * @param stack Stack 56 * @param size New size boundary 57 */ 58 59 /** 60 * @def PUSH(stack, size, type) 61 * 62 * Allocates 'size' elements of type 'type' on the stack 63 * 64 * @param stack Stack 65 * @param size Number of elements 66 * @param type Type of element 67 */ 68 69 /** 70 * @def VARDECL(var) 71 * 72 * Declare variable on stack 73 * 74 * @param var Variable to declare 75 */ 76 77 /** 78 * @def ALLOC(var, size, type) 79 * 80 * Allocate 'size' elements of 'type' on stack 81 * 82 * @param var Name of variable to allocate 83 * @param size Number of elements 84 * @param type Type of element 85 */ 86 87 #ifdef ENABLE_VALGRIND 88 89 #include <valgrind/memcheck.h> 90 91 #define ALIGN(stack, size) ((stack) += ((size) - (long)(stack)) & ((size) - 1)) 92 93 #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)))) 94 95 #else 96 97 #define ALIGN(stack, size) ((stack) += ((size) - (long)(stack)) & ((size) - 1)) 98 99 #define PUSH(stack, size, type) (ALIGN((stack),sizeof(type)),(stack)+=((size)*sizeof(type)),(type*)((stack)-((size)*sizeof(type)))) 100 101 #endif 102 103 #if defined(VAR_ARRAYS) 104 #define VARDECL(var) 105 #define ALLOC(var, size, type) type var[size] 106 #elif defined(USE_ALLOCA) 107 #define VARDECL(var) var 108 #define ALLOC(var, size, type) var = alloca(sizeof(type)*(size)) 109 #else 110 #define VARDECL(var) var 111 #define ALLOC(var, size, type) var = PUSH(stack, size, type) 112 #endif 113 114 115 #endif 116
