| /* Copyright (C) 2002 Jean-Marc Valin */ |
| /** |
| @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. |
| |
| - Neither the name of the Xiph.org Foundation nor the names of its |
| contributors may be used to endorse or promote products derived from |
| this software without specific prior written permission. |
| |
| 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 |
| */ |
| |
| #ifdef ENABLE_VALGRIND |
| |
| #include <valgrind/memcheck.h> |
| |
| #define ALIGN(stack, size) ((stack) += ((size) - (long)(stack)) & ((size) - 1)) |
| |
| #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)))) |
| |
| #else |
| |
| #define ALIGN(stack, size) ((stack) += ((size) - (long)(stack)) & ((size) - 1)) |
| |
| #define PUSH(stack, size, type) (ALIGN((stack),sizeof(type)),(stack)+=((size)*sizeof(type)),(type*)((stack)-((size)*sizeof(type)))) |
| |
| #endif |
| |
| #if defined(VAR_ARRAYS) |
| #define VARDECL(var) |
| #define ALLOC(var, size, type) type var[size] |
| #elif defined(USE_ALLOCA) |
| #define VARDECL(var) var |
| #define ALLOC(var, size, type) var = alloca(sizeof(type)*(size)) |
| #else |
| #define VARDECL(var) var |
| #define ALLOC(var, size, type) var = PUSH(stack, size, type) |
| #endif |
| |
| |
| #endif |