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91bcdea2a2
git-svn-id: file:///Users/olsen/Code/migration-svn-zu-git/logical-line-staging/clib2/trunk@14685 87f5fb63-7c3d-0410-a384-fd976d0f7a62
161 lines
4.1 KiB
C
161 lines
4.1 KiB
C
/*
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* $Id: stdlib_alloca.c,v 1.1.1.1 2004-07-26 16:31:50 obarthel Exp $
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*
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* :ts=4
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*
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* Portable ISO 'C' (1994) runtime library for the Amiga computer
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* Copyright (c) 2002-2004 by Olaf Barthel <olsen@sourcery.han.de>
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* All rights reserved.
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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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*
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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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*
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* - Neither the name of Olaf Barthel nor the names of contributors
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* may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _STDLIB_MEM_DEBUG_H
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#include "stdlib_mem_debug.h"
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#endif /* _STDLIB_MEM_DEBUG_H */
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/****************************************************************************/
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#ifndef _STDLIB_HEADERS_H
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#include "stdlib_headers.h"
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#endif /* _STDLIB_HEADERS_H */
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/****************************************************************************/
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#undef alloca
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extern void * alloca(size_t size);
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/****************************************************************************/
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struct MemoryContextNode
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{
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struct MinNode mcn_MinNode;
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ULONG mcn_StackPointer;
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char * mcn_Memory;
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};
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/****************************************************************************/
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extern unsigned long __get_sp(void);
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/****************************************************************************/
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void
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__alloca_cleanup(const char * file,int line)
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{
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ULONG stack_pointer = __get_sp();
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struct MemoryContextNode * mcn_next;
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struct MemoryContextNode * mcn;
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/* ZZZ this could be done in a much smarter fashion by paying attention
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* to the fact that the 'mcn_StackPointer' members are sorted...
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*/
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for(mcn = (struct MemoryContextNode *)__alloca_memory_list.mlh_Head ;
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mcn->mcn_MinNode.mln_Succ != NULL ;
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mcn = mcn_next)
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{
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mcn_next = (struct MemoryContextNode *)mcn->mcn_MinNode.mln_Succ;
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if(mcn->mcn_StackPointer < stack_pointer)
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{
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Remove((struct Node *)mcn);
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__force_free(mcn->mcn_Memory,file,line);
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__force_free(mcn,file,line);
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}
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}
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}
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/****************************************************************************/
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void *
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__alloca(size_t size,const char * file,int line)
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{
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ULONG stack_pointer = __get_sp();
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struct MemoryContextNode * mcn;
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void * result = NULL;
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__alloca_cleanup(file,line);
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assert( (int)size >= 0 );
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if(size == 0)
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{
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#ifdef __MEM_DEBUG
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{
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kprintf("[%s] ",__program_name);
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if(file != NULL)
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kprintf("%s:%ld:",file,line);
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kprintf("alloca(0) called.\n");
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}
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#endif /* __MEM_DEBUG */
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goto out;
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}
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mcn = __allocate_memory(sizeof(*mcn),FALSE,file,line);
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if(mcn == NULL)
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{
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SHOWMSG("not enough memory");
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goto out;
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}
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/* Allocate memory which cannot be run through realloc()
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* or free().
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*/
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mcn->mcn_Memory = __allocate_memory(size,TRUE,file,line);
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if(mcn->mcn_Memory == NULL)
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{
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SHOWMSG("not enough memory");
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__force_free(mcn,file,line);
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goto out;
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}
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mcn->mcn_StackPointer = stack_pointer;
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AddTail((struct List *)&__alloca_memory_list,(struct Node *)mcn);
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result = mcn->mcn_Memory;
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out:
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return(result);
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}
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/****************************************************************************/
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void *
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alloca(size_t size)
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{
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void * result;
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result = __alloca(size,NULL,0);
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return(result);
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}
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