| /* Copyright (C) 2002-2003 Jean-Marc Valin |
| Copyright (C) 2007-2009 Xiph.Org Foundation */ |
| /** |
| @file stack_alloc.h |
| @brief Temporary memory allocation on stack |
| */ |
| /* |
| Redistribution and use in source and binary forms, with or without |
| modification, are permitted provided that the following conditions |
| are met: |
| |
| - Redistributions of source code must retain the above copyright |
| notice, this list of conditions and the following disclaimer. |
| |
| - Redistributions in binary form must reproduce the above copyright |
| notice, this list of conditions and the following disclaimer in the |
| documentation and/or other materials provided with the distribution. |
| |
| THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR |
| CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
| LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
| NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #ifndef STACK_ALLOC_H |
| #define STACK_ALLOC_H |
| |
| #ifdef USE_ALLOCA |
| # ifdef WIN32 |
| # include <malloc.h> |
| # else |
| # ifdef HAVE_ALLOCA_H |
| # include <alloca.h> |
| # else |
| # include <stdlib.h> |
| # endif |
| # endif |
| #endif |
| |
| /** |
| * @def ALIGN(stack, size) |
| * |
| * Aligns the stack to a 'size' boundary |
| * |
| * @param stack Stack |
| * @param size New size boundary |
| */ |
| |
| /** |
| * @def PUSH(stack, size, type) |
| * |
| * Allocates 'size' elements of type 'type' on the stack |
| * |
| * @param stack Stack |
| * @param size Number of elements |
| * @param type Type of element |
| */ |
| |
| /** |
| * @def VARDECL(var) |
| * |
| * Declare variable on stack |
| * |
| * @param var Variable to declare |
| */ |
| |
| /** |
| * @def ALLOC(var, size, type) |
| * |
| * Allocate 'size' elements of 'type' on stack |
| * |
| * @param var Name of variable to allocate |
| * @param size Number of elements |
| * @param type Type of element |
| */ |
| |
| |
| #if defined(VAR_ARRAYS) |
| |
| #define VARDECL(type, var) |
| #define ALLOC(var, size, type) type var[size] |
| #define SAVE_STACK |
| #define RESTORE_STACK |
| #define ALLOC_STACK |
| |
| #elif defined(USE_ALLOCA) |
| |
| #define VARDECL(type, var) type *var |
| |
| # ifdef WIN32 |
| # define ALLOC(var, size, type) var = ((type*)_alloca(sizeof(type)*(size))) |
| # else |
| # define ALLOC(var, size, type) var = ((type*)alloca(sizeof(type)*(size))) |
| # endif |
| |
| #define SAVE_STACK |
| #define RESTORE_STACK |
| #define ALLOC_STACK |
| |
| #else |
| |
| #ifdef CELT_C |
| char *global_stack=0; |
| #else |
| extern char *global_stack; |
| #endif /*CELT_C*/ |
| |
| #ifdef ENABLE_VALGRIND |
| |
| #include <valgrind/memcheck.h> |
| |
| #ifdef CELT_C |
| char *global_stack_top=0; |
| #else |
| extern char *global_stack_top; |
| #endif /*CELT_C*/ |
| |
| #define ALIGN(stack, size) ((stack) += ((size) - (long)(stack)) & ((size) - 1)) |
| #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)))) |
| #define RESTORE_STACK ((global_stack = _saved_stack),VALGRIND_MAKE_MEM_NOACCESS(global_stack, global_stack_top-global_stack)) |
| #define ALLOC_STACK ((global_stack = (global_stack==0) ? ((global_stack_top=celt_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)) |
| |
| #else |
| |
| #define ALIGN(stack, size) ((stack) += ((size) - (long)(stack)) & ((size) - 1)) |
| #define PUSH(stack, size, type) (ALIGN((stack),sizeof(type)/sizeof(char)),(stack)+=(size)*(sizeof(type)/sizeof(char)),(type*)((stack)-(size)*(sizeof(type)/sizeof(char)))) |
| #define RESTORE_STACK (global_stack = _saved_stack) |
| #define ALLOC_STACK (global_stack = (global_stack==0) ? celt_alloc_scratch(GLOBAL_STACK_SIZE) : global_stack) |
| |
| #endif /*ENABLE_VALGRIND*/ |
| |
| #include "os_support.h" |
| #define VARDECL(type, var) type *var |
| #define ALLOC(var, size, type) var = PUSH(global_stack, size, type) |
| #define SAVE_STACK char *_saved_stack = global_stack; |
| |
| #endif /*VAR_ARRAYS*/ |
| |
| |
| #endif /*STACK_ALLOC_H*/ |