1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one or more 3 * contributor license agreements. See the NOTICE file distributed with 4 * this work for additional information regarding copyright ownership. 5 * The ASF licenses this file to You under the Apache License, Version 2.0 6 * (the "License"); you may not use this file except in compliance with 7 * the License. You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 */ 17 /* 18 * Copyright (C) 2012 The Android Open Source Project 19 * 20 * Licensed under the Apache License, Version 2.0 (the "License"); 21 * you may not use this file except in compliance with the License. 22 * You may obtain a copy of the License at 23 * 24 * http://www.apache.org/licenses/LICENSE-2.0 25 * 26 * Unless required by applicable law or agreed to in writing, software 27 * distributed under the License is distributed on an "AS IS" BASIS, 28 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 29 * See the License for the specific language governing permissions and 30 * limitations under the License. 31 */ 32 33 package java.lang; 34 35 import com.android.dex.Dex; 36 37 /** 38 * A dex cache holds resolved copies of strings, fields, methods, and classes from the dexfile. 39 */ 40 final class DexCache { 41 /** Lazily initialized dex file wrapper. Volatile to avoid double-check locking issues. */ 42 private volatile Dex dex; 43 44 /** The location of the associated dex file. */ 45 String location; 46 47 /** 48 * References to methods as they become resolved following interpreter semantics. May refer to 49 * methods defined in other dex files. 50 */ 51 Object resolvedMethods; 52 53 /** 54 * References to fields as they become resolved following interpreter semantics. May refer to 55 * fields defined in other dex files. Either an int array or long array. 56 */ 57 private Object resolvedFields; 58 59 /** 60 * References to types as they become resolved following interpreter semantics. May refer to 61 * types defined in other dex files. 62 */ 63 Class[] resolvedTypes; 64 65 /** 66 * References to strings as they become resolved following interpreter semantics. All strings 67 * are interned. 68 */ 69 String[] strings; 70 71 /** Holds C pointer to dexFile. */ 72 private long dexFile; 73 74 // Only created by the VM. DexCache()75 private DexCache() {} 76 getDex()77 Dex getDex() { 78 Dex result = dex; 79 if (result == null) { 80 synchronized (this) { 81 result = dex; 82 if (result == null) { 83 dex = result = getDexNative(); 84 } 85 } 86 } 87 return result; 88 } 89 getResolvedType(int typeIndex)90 native Class<?> getResolvedType(int typeIndex); getResolvedString(int stringIndex)91 native String getResolvedString(int stringIndex); setResolvedType(int typeIndex, Class<?> type)92 native void setResolvedType(int typeIndex, Class<?> type); setResolvedString(int stringIndex, String string)93 native void setResolvedString(int stringIndex, String string); getDexNative()94 private native Dex getDexNative(); 95 } 96 97