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/*
* Copyright (C) 2010 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
* Maintain a card table from the the write barrier. All writes of
* non-NULL values to heap addresses should go through an entry in
* WriteBarrier, and from there to here.
*/
#ifndef _DALVIK_ALLOC_CARDTABLE
#define _DALVIK_ALLOC_CARDTABLE
#ifdef __cplusplus
extern "C" {
#endif
#define GC_CARD_SHIFT 7
#define GC_CARD_SIZE (1 << GC_CARD_SHIFT)
#define GC_CARD_CLEAN 0
#define GC_CARD_DIRTY 0x70
/*
* Initializes the card table; must be called before any other
* dvmCardTable*() functions.
*/
bool dvmCardTableStartup(size_t heapMaximumSize);
/*
* Tears down the entire CardTable structure.
*/
void dvmCardTableShutdown(void);
/*
* Resets all of the bytes in the card table to clean.
*/
void dvmClearCardTable(void);
/*
* Returns the address of the relevent byte in the card table, given
* an address on the heap.
*/
u1 *dvmCardFromAddr(const void *addr);
/*
* Returns the first address in the heap which maps to this card.
*/
void *dvmAddrFromCard(const u1 *card);
/*
* Returns true if addr points to a valid card.
*/
bool dvmIsValidCard(const u1 *card);
/*
* Set the card associated with the given address to GC_CARD_DIRTY.
*/
void dvmMarkCard(const void *addr);
/*
* Verifies that all gray objects are on a dirty card.
*/
void dvmVerifyCardTable(void);
#ifdef __cplusplus
}
#endif
#endif /*_DALVIK_ALLOC_CARDTABLE*/
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