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stack_alloc.h

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00001 /* Copyright (C) 2002 Jean-Marc Valin 
00002    File: stack_alloc.h
00003    
00004    Temporary memory allocation on stack
00005 
00006    Redistribution and use in source and binary forms, with or without
00007    modification, are permitted provided that the following conditions
00008    are met:
00009    
00010    - Redistributions of source code must retain the above copyright
00011    notice, this list of conditions and the following disclaimer.
00012    
00013    - Redistributions in binary form must reproduce the above copyright
00014    notice, this list of conditions and the following disclaimer in the
00015    documentation and/or other materials provided with the distribution.
00016    
00017    - Neither the name of the Xiph.org Foundation nor the names of its
00018    contributors may be used to endorse or promote products derived from
00019    this software without specific prior written permission.
00020    
00021    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
00022    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
00023    LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
00024    A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR
00025    CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
00026    EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
00027    PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
00028    PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
00029    LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
00030    NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
00031    SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
00032 */
00033 
00034 #ifndef STACK_ALLOC_H
00035 #define STACK_ALLOC_H
00036 
00037 #ifdef ENABLE_VALGRIND
00038 
00039 #include <valgrind/memcheck.h>
00040 /*Aligns the stack to a 'size' boundary */
00041 #define ALIGN(stack, size) ((stack) += ((size) - (long)(stack)) & ((size) - 1))
00042 
00043 /* Allocates 'size' elements of type 'type' on the stack */
00044 #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))))
00045 
00046 /* Allocates a struct stack */
00047 #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))))
00048 
00049 #else
00050 
00051 
00052 /*Aligns the stack to a 'size' boundary */
00053 #define ALIGN(stack, size) ((stack) += ((size) - (long)(stack)) & ((size) - 1))
00054 
00055 /* Allocates 'size' elements of type 'type' on the stack */
00056 #define PUSH(stack, size, type) (ALIGN((stack),sizeof(type)),(stack)+=((size)*sizeof(type)),(type*)((stack)-((size)*sizeof(type))))
00057 
00058 /* Allocates a struct stack */
00059 #define PUSHS(stack, type) (ALIGN((stack),sizeof(long)),(stack)+=(sizeof(type)),(type*)((stack)-(sizeof(type))))
00060 
00061 #endif
00062 
00063 
00064 
00065 #endif

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