1 /* 2 * Copyright (C) 2010 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 /* 18 * Maintain a card table from the the write barrier. All writes of 19 * non-NULL values to heap addresses should go through an entry in 20 * WriteBarrier, and from there to here. 21 */ 22 23 #ifndef DALVIK_ALLOC_CARDTABLE_H_ 24 #define DALVIK_ALLOC_CARDTABLE_H_ 25 26 #define GC_CARD_SHIFT 7 27 #define GC_CARD_SIZE (1 << GC_CARD_SHIFT) 28 #define GC_CARD_CLEAN 0 29 #define GC_CARD_DIRTY 0x70 30 31 /* 32 * Initializes the card table; must be called before any other 33 * dvmCardTable*() functions. 34 */ 35 bool dvmCardTableStartup(size_t heapMaximumSize, size_t growthLimit); 36 37 /* 38 * Tears down the entire CardTable structure. 39 */ 40 void dvmCardTableShutdown(void); 41 42 /* 43 * Resets all of the bytes in the card table to clean. 44 */ 45 void dvmClearCardTable(void); 46 47 /* 48 * Returns the address of the relevent byte in the card table, given 49 * an address on the heap. 50 */ 51 u1 *dvmCardFromAddr(const void *addr); 52 53 /* 54 * Returns the first address in the heap which maps to this card. 55 */ 56 void *dvmAddrFromCard(const u1 *card); 57 58 /* 59 * Returns true if addr points to a valid card. 60 */ 61 bool dvmIsValidCard(const u1 *card); 62 63 /* 64 * Set the card associated with the given address to GC_CARD_DIRTY. 65 */ 66 void dvmMarkCard(const void *addr); 67 68 /* 69 * Verifies that all gray objects are on a dirty card. 70 */ 71 void dvmVerifyCardTable(void); 72 73 #endif // DALVIK_ALLOC_CARDTABLE_H_ 74