144 lines
4.6 KiB
C
Executable file
144 lines
4.6 KiB
C
Executable file
/* Copyright (C) 2002 Jean-Marc Valin */
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/**
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@file stack_alloc.h
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@brief Temporary memory allocation on stack
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*/
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/*
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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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# ifdef WIN32
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# include <malloc.h>
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# else
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# ifdef HAVE_ALLOCA_H
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# include <alloca.h>
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# else
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# include <stdlib.h>
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# endif
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# endif
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#endif
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/**
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* @def ALIGN(stack, size)
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*
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* Aligns the stack to a 'size' boundary
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*
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* @param stack Stack
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* @param size New size boundary
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*/
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/**
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* @def PUSH(stack, size, type)
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*
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* Allocates 'size' elements of type 'type' on the stack
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*
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* @param stack Stack
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* @param size Number of elements
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* @param type Type of element
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*/
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/**
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* @def VARDECL(var)
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*
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* Declare variable on stack
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*
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* @param var Variable to declare
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*/
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/**
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* @def ALLOC(var, size, type)
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*
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* Allocate 'size' elements of 'type' on stack
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*
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* @param var Name of variable to allocate
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* @param size Number of elements
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* @param type Type of element
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*/
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#if defined(VAR_ARRAYS)
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#define VARDECL(type, var)
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#define ALLOC(var, size, type) type var[size]
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#define SAVE_STACK
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#define RESTORE_STACK
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#define ALLOC_STACK
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#elif defined(USE_ALLOCA)
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#define VARDECL(type, var) type *var
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#define ALLOC(var, size, type) var = ((type*)alloca(sizeof(type)*(size)))
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#define SAVE_STACK
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#define RESTORE_STACK
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#define ALLOC_STACK
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#else
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#ifdef CELT_C
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char *global_stack=0;
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#else
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extern char *global_stack;
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#endif /*CELT_C*/
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#ifdef ENABLE_VALGRIND
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#include <valgrind/memcheck.h>
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#ifdef CELT_C
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char *global_stack_top=0;
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#else
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extern char *global_stack_top;
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#endif /*CELT_C*/
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#define ALIGN(stack, size) ((stack) += ((size) - (long)(stack)) & ((size) - 1))
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#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))))
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#define RESTORE_STACK ((global_stack = _saved_stack),VALGRIND_MAKE_MEM_NOACCESS(global_stack, global_stack_top-global_stack))
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#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))
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#else
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#define ALIGN(stack, size) ((stack) += ((size) - (long)(stack)) & ((size) - 1))
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#define PUSH(stack, size, type) (ALIGN((stack),sizeof(type)/sizeof(char)),(stack)+=(size)*(sizeof(type)/sizeof(char)),(type*)((stack)-(size)*(sizeof(type)/sizeof(char))))
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#define RESTORE_STACK (global_stack = _saved_stack)
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#define ALLOC_STACK (global_stack = (global_stack==0) ? celt_alloc_scratch(GLOBAL_STACK_SIZE) : global_stack)
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#endif /*ENABLE_VALGRIND*/
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#include "os_support.h"
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#define VARDECL(type, var) type *var
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#define ALLOC(var, size, type) var = PUSH(global_stack, size, type)
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#define SAVE_STACK char *_saved_stack = global_stack;
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#endif /*VAR_ARRAYS*/
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#endif /*STACK_ALLOC_H*/
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