1 /* Copyright (C) 2002-2003 Jean-Marc Valin 2 Copyright (C) 2007-2009 Xiph.Org Foundation */ 3 /** 4 @file stack_alloc.h 5 @brief Temporary memory allocation on stack 6 */ 7 /* 8 Redistribution and use in source and binary forms, with or without 9 modification, are permitted provided that the following conditions 10 are met: 11 12 - Redistributions of source code must retain the above copyright 13 notice, this list of conditions and the following disclaimer. 14 15 - Redistributions in binary form must reproduce the above copyright 16 notice, this list of conditions and the following disclaimer in the 17 documentation and/or other materials provided with the distribution. 18 19 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 20 ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 21 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 22 A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER 23 OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 24 EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 25 PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 26 PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 27 LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 28 NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 29 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #ifndef STACK_ALLOC_H 33 #define STACK_ALLOC_H 34 35 #if (!defined (VAR_ARRAYS) && !defined (USE_ALLOCA) && !defined (NONTHREADSAFE_PSEUDOSTACK)) 36 #error "Opus requires one of VAR_ARRAYS, USE_ALLOCA, or NONTHREADSAFE_PSEUDOSTACK be defined to select the temporary allocation mode." 37 #endif 38 39 #ifdef USE_ALLOCA 40 # ifdef WIN32 41 # include <malloc.h> 42 # else 43 # ifdef HAVE_ALLOCA_H 44 # include <alloca.h> 45 # else 46 # include <stdlib.h> 47 # endif 48 # endif 49 #endif 50 51 /** 52 * @def ALIGN(stack, size) 53 * 54 * Aligns the stack to a 'size' boundary 55 * 56 * @param stack Stack 57 * @param size New size boundary 58 */ 59 60 /** 61 * @def PUSH(stack, size, type) 62 * 63 * Allocates 'size' elements of type 'type' on the stack 64 * 65 * @param stack Stack 66 * @param size Number of elements 67 * @param type Type of element 68 */ 69 70 /** 71 * @def VARDECL(var) 72 * 73 * Declare variable on stack 74 * 75 * @param var Variable to declare 76 */ 77 78 /** 79 * @def ALLOC(var, size, type) 80 * 81 * Allocate 'size' elements of 'type' on stack 82 * 83 * @param var Name of variable to allocate 84 * @param size Number of elements 85 * @param type Type of element 86 */ 87 88 #if defined(VAR_ARRAYS) 89 90 #define VARDECL(type, var) 91 #define ALLOC(var, size, type) type var[size] 92 #define SAVE_STACK 93 #define RESTORE_STACK 94 #define ALLOC_STACK 95 96 #elif defined(USE_ALLOCA) 97 98 #define VARDECL(type, var) type *var 99 100 # ifdef WIN32 101 # define ALLOC(var, size, type) var = ((type*)_alloca(sizeof(type)*(size))) 102 # else 103 # define ALLOC(var, size, type) var = ((type*)alloca(sizeof(type)*(size))) 104 # endif 105 106 #define SAVE_STACK 107 #define RESTORE_STACK 108 #define ALLOC_STACK 109 110 #else 111 112 #ifdef CELT_C 113 char *global_stack=0; 114 #else 115 extern char *global_stack; 116 #endif /* CELT_C */ 117 118 #ifdef ENABLE_VALGRIND 119 120 #include <valgrind/memcheck.h> 121 122 #ifdef CELT_C 123 char *global_stack_top=0; 124 #else 125 extern char *global_stack_top; 126 #endif /* CELT_C */ 127 128 #define ALIGN(stack, size) ((stack) += ((size) - (long)(stack)) & ((size) - 1)) 129 #define PUSH(stack, size, type) (VALGRIND_MAKE_MEM_NOACCESS(stack, global_stack_top-stack),ALIGN((stack),sizeof(type)/sizeof(char)),VALGRIND_MAKE_MEM_UNDEFINED(stack, ((size)*sizeof(type)/sizeof(char))),(stack)+=(2*(size)*sizeof(type)/sizeof(char)),(type*)((stack)-(2*(size)*sizeof(type)/sizeof(char)))) 130 #define RESTORE_STACK ((global_stack = _saved_stack),VALGRIND_MAKE_MEM_NOACCESS(global_stack, global_stack_top-global_stack)) 131 #define ALLOC_STACK char *_saved_stack; ((global_stack = (global_stack==0) ? ((global_stack_top=opus_alloc_scratch(GLOBAL_STACK_SIZE*2)+(GLOBAL_STACK_SIZE*2))-(GLOBAL_STACK_SIZE*2)) : global_stack),VALGRIND_MAKE_MEM_NOACCESS(global_stack, global_stack_top-global_stack)); _saved_stack = global_stack; 132 133 #else 134 135 #define ALIGN(stack, size) ((stack) += ((size) - (long)(stack)) & ((size) - 1)) 136 #define PUSH(stack, size, type) (ALIGN((stack),sizeof(type)/sizeof(char)),(stack)+=(size)*(sizeof(type)/sizeof(char)),(type*)((stack)-(size)*(sizeof(type)/sizeof(char)))) 137 #define RESTORE_STACK (global_stack = _saved_stack) 138 #define ALLOC_STACK char *_saved_stack; (global_stack = (global_stack==0) ? opus_alloc_scratch(GLOBAL_STACK_SIZE) : global_stack); _saved_stack = global_stack; 139 140 #endif /* ENABLE_VALGRIND */ 141 142 #include "os_support.h" 143 #define VARDECL(type, var) type *var 144 #define ALLOC(var, size, type) var = PUSH(global_stack, size, type) 145 #define SAVE_STACK char *_saved_stack = global_stack; 146 147 #endif /* VAR_ARRAYS */ 148 149 #endif /* STACK_ALLOC_H */ 150
