79 lines
3.1 KiB
C
79 lines
3.1 KiB
C
/* Copyright (C) 2002 Jean-Marc Valin
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File: stack_alloc.h
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Temporary memory allocation on stack
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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- Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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- Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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- Neither the name of the Xiph.org Foundation nor the names of its
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contributors may be used to endorse or promote products derived from
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this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
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CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef STACK_ALLOC_H
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#define STACK_ALLOC_H
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#ifdef USE_ALLOCA
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#include <alloca.h>
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#endif
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#ifdef ENABLE_VALGRIND
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#include <valgrind/memcheck.h>
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/*Aligns the stack to a 'size' boundary */
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#define ALIGN(stack, size) ((stack) += ((size) - (long)(stack)) & ((size) - 1))
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/* Allocates 'size' elements of type 'type' on the stack */
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#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))))
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/* Allocates a struct stack */
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#define PUSHS(stack, type) (VALGRIND_MAKE_NOACCESS(stack, 1000),ALIGN((stack),sizeof(long)),VALGRIND_MAKE_WRITABLE(stack, (sizeof(type))),(stack)+=(sizeof(type)),(type*)((stack)-(sizeof(type))))
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#else
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/*Aligns the stack to a 'size' boundary */
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#define ALIGN(stack, size) ((stack) += ((size) - (long)(stack)) & ((size) - 1))
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/* Allocates 'size' elements of type 'type' on the stack */
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#define PUSH(stack, size, type) (ALIGN((stack),sizeof(type)),(stack)+=((size)*sizeof(type)),(type*)((stack)-((size)*sizeof(type))))
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/* Allocates a struct stack */
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#define PUSHS(stack, type) (ALIGN((stack),sizeof(long)),(stack)+=(sizeof(type)),(type*)((stack)-(sizeof(type))))
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#endif
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#if defined(VAR_ARRAYS)
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#define VARDECL(var)
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#define ALLOC(var, size, type) type var[size]
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#elif defined(USE_ALLOCA)
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#define VARDECL(var) var
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#define ALLOC(var, size, type) var = alloca(sizeof(type)*size)
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#else
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#define VARDECL(var) var
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#define ALLOC(var, size, type) var = PUSH(stack, size, type)
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#endif
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#endif
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