79 lines
2.6 KiB
C
79 lines
2.6 KiB
C
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/*
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* $Id$
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*
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Copyright (c) 2014-2015 Chung, Hyung-Hwan. All rights reserved.
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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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1. 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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2. 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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THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR
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IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "stix-prv.h"
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stix_heap_t* stix_makeheap (stix_t* stix, stix_size_t size)
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{
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stix_heap_t* heap;
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heap = (stix_heap_t*)STIX_MMGR_ALLOC(stix->mmgr, STIX_SIZEOF(*heap) + size);
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if (!heap)
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{
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stix->errnum = STIX_ENOMEM;
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return STIX_NULL;
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}
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STIX_MEMSET (heap, 0, STIX_SIZEOF(*heap) + size);
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heap->base = (stix_uint8_t*)(heap + 1);
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/* adjust the initial allocation pointer to a multiple of the oop size */
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heap->ptr = (stix_uint8_t*)STIX_ALIGN(((stix_uintptr_t)heap->base), STIX_SIZEOF(stix_oop_t));
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heap->limit = heap->base + size;
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STIX_ASSERT (heap->ptr >= heap->base);
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/* if size is too small, heap->ptr may go past heap->limit even at
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* this moment depending on the alignment of heap->base. subsequent
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* calls to substix_allocheapmem() are bound to fail. Make sure to
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* pass a heap size large enough */
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return heap;
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}
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void stix_killheap (stix_t* stix, stix_heap_t* heap)
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{
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STIX_MMGR_FREE (stix->mmgr, heap);
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}
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void* stix_allocheapmem (stix_t* stix, stix_heap_t* heap, stix_size_t size)
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{
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stix_uint8_t* ptr;
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/* check the heap size limit */
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if (heap->ptr >= heap->limit || heap->limit - heap->ptr < size)
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{
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stix->errnum = STIX_ENOMEM;
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return STIX_NULL;
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}
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/* allocation is as simple as moving the heap pointer */
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ptr = heap->ptr;
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heap->ptr += size;
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return ptr;
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}
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