208 lines
7.2 KiB
C
208 lines
7.2 KiB
C
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/****************************************************************************
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*
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* Open Watcom Project
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*
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* Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
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*
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* ========================================================================
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*
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* This file contains Original Code and/or Modifications of Original
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* Code as defined in and that are subject to the Sybase Open Watcom
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* Public License version 1.0 (the 'License'). You may not use this file
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* except in compliance with the License. BY USING THIS FILE YOU AGREE TO
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* ALL TERMS AND CONDITIONS OF THE LICENSE. A copy of the License is
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* provided with the Original Code and Modifications, and is also
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* available at www.sybase.com/developer/opensource.
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*
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* The Original Code and all software distributed under the License are
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* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
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* EXPRESS OR IMPLIED, AND SYBASE AND ALL CONTRIBUTORS HEREBY DISCLAIM
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* ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR
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* NON-INFRINGEMENT. Please see the License for the specific language
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* governing rights and limitations under the License.
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*
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* ========================================================================
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*
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* Description: Heap library configuration for various platforms.
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*
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****************************************************************************/
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#include "variety.h"
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#if defined(_M_IX86)
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#include <i86.h>
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#endif
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#if !defined(__DOS_EXT__)
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#if defined(__386__) && \
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!defined(__WINDOWS_386__) && \
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!defined(__WINDOWS__) && \
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!defined(__OS2__) && \
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!defined(__NT__) && \
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!defined(__OSI__) && \
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!defined(__UNIX__)
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#define __DOS_EXT__
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#endif
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#endif
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typedef unsigned int tag;
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typedef struct freelistp frl;
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typedef struct freelistp _WCNEAR *frlptr;
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typedef struct freelist _WCFAR *farfrlptr;
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typedef unsigned char _WCNEAR *PTR;
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typedef unsigned char _WCFAR *FARPTR;
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typedef struct miniheapblkp _WCNEAR *mheapptr;
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/*
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** NOTE: the size of these data structures is critical to the alignemnt
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** of the pointers returned by malloc().
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*/
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struct freelist {
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tag len; /* length of block in free list */
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unsigned int prev; /* offset of previous block in free list */
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unsigned int next; /* offset of next block in free list */
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};
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struct heapblk {
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tag heaplen; /* size of heap (0 = 64K) */
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unsigned int prevseg; /* segment selector for previous heap */
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unsigned int nextseg; /* segment selector for next heap */
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unsigned int rover; /* roving pointer into free list */
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unsigned int b4rover; /* largest block before rover */
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unsigned int largest_blk; /* largest block in the heap */
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unsigned int numalloc; /* number of allocated blocks in heap */
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unsigned int numfree; /* number of free blocks in the heap */
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struct freelist freehead; /* listhead of free blocks in heap */
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};
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struct freelistp {
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tag len;
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frlptr prev;
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frlptr next;
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};
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struct heapblkp {
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tag heaplen;
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unsigned int prevseg;
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unsigned int nextseg;
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frlptr rover;
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unsigned int b4rover;
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unsigned int largest_blk;
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unsigned int numalloc;
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unsigned int numfree;
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frl freehead;
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};
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struct miniheapblkp {
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tag len;
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mheapptr prev;
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mheapptr next;
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frlptr rover;
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unsigned int b4rover;
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unsigned int largest_blk;
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unsigned int numalloc;
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unsigned int numfree;
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frl freehead;
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};
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struct heapstart {
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struct heapblk h;
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struct freelist first;
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};
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struct heapend {
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tag last_tag;
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struct freelist last;
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};
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#ifdef __DOS_EXT__
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struct dpmi_hdr {
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unsigned long dpmi_handle;
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tag dos_seg_value; // 0 => DPMI block, else DOS segment
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};
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#endif
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extern unsigned _curbrk;
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extern mheapptr _WCNEAR __nheapbeg;
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#if defined(_M_IX86)
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extern __segment __fheap;
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extern __segment __bheap;
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extern __segment __fheapRover;
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#endif
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extern int __heap_enabled;
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extern unsigned int __LargestSizeB4Rover;
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extern struct miniheapblkp _WCNEAR *__MiniHeapRover;
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extern unsigned int __LargestSizeB4MiniHeapRover;
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extern struct miniheapblkp _WCNEAR *__MiniHeapFreeRover;
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extern size_t __LastFree( void );
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extern int __NHeapWalk( struct _heapinfo *entry, mheapptr heapbeg );
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extern int __ExpandDGROUP( unsigned int __amt );
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#if defined(_M_IX86)
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extern unsigned __AllocSeg( unsigned int __amt );
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extern unsigned __GrowSeg( __segment __seg, unsigned int __amt );
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extern int __FreeSeg( __segment seg );
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extern int __HeapWalk( struct _heapinfo *entry, __segment seg, unsigned all );
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extern int __HeapMin( __segment seg, unsigned one_seg );
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extern int __HeapSet( __segment seg, unsigned fill );
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#endif
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#if defined(__DOS_EXT__)
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extern void __FreeDPMIBlocks( void );
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extern void *__ReAllocDPMIBlock( frlptr p1, unsigned req_size );
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extern void *__ExpandDPMIBlock( frlptr, unsigned );
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#endif
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extern int __HeapManager_expand( __segment seg, unsigned offset,
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size_t req_size, size_t *growth_size );
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extern void _WCFAR __HeapInit( void _WCNEAR *start, unsigned int amount );
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_WCRTLINK extern void _WCNEAR *__brk( unsigned );
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#if defined(_M_IX86)
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#define _DGroup() FP_SEG((&__nheapbeg))
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#else
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#define _DGroup() 0
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#endif
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// __IsCtsNHeap() is used to determine whether the operating system provides
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// a continuous near heap block. __ExpandDGroup should slice for more near
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// heap under those operating systems with __IsCtsNHeap() == 1.
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#if defined(__WARP__) || \
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defined(__NT__) || \
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defined(__WINDOWS_386__) || \
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defined(__WINDOWS_286__)
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#define __IsCtsNHeap() 0
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#elif defined(__DOS_EXT__)
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#define __IsCtsNHeap() ((_IsRationalZeroBase() || _IsCodeBuilder()) ? 0 : 1)
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#else
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#define __IsCtsNHeap() 1
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#endif
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extern unsigned __MemAllocator( unsigned __sz, unsigned __seg, unsigned __off );
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extern void __MemFree( unsigned __ptr, unsigned __seg, unsigned __off );
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#if defined(_M_IX86)
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#if defined(__386__)
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#pragma aux __MemAllocator "*" parm [eax] [edx] [ebx];
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#pragma aux __MemFree "*" parm [eax] [edx] [ebx];
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#else
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#pragma aux __MemAllocator "*" parm [ax] [dx] [bx];
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#pragma aux __MemFree "*" parm [ax] [dx] [bx];
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#endif
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#endif
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#define PARAS_IN_64K (0x1000)
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#define END_TAG (~0)
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#define TAG_SIZE (sizeof(tag))
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#if defined(M_I86)
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#define ROUND_SIZE (TAG_SIZE-1)
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#else
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#define ROUND_SIZE (TAG_SIZE+TAG_SIZE-1)
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#endif
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#define FRL_SIZE ((sizeof(frl)+ROUND_SIZE)&~ROUND_SIZE)
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#define __HM_SUCCESS 0
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#define __HM_FAIL 1
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#define __HM_TRYGROW 2
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