1 /* 2 * Copyright (C) 2016 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 package com.android.ahat.heapdump; 18 19 import java.util.AbstractList; 20 import java.util.Arrays; 21 import java.util.List; 22 23 /** 24 * A class from a parsed heap dump. 25 * In addition to those methods inherited from {@link AhatInstance}, the class 26 * provides methods for accessing information about the class object, such as 27 * the class loader, superclass, static field values and instance field 28 * descriptors. 29 */ 30 public class AhatClassObj extends AhatInstance { 31 private String mClassName; 32 private AhatClassObj mSuperClassObj; 33 private AhatInstance mClassLoader; 34 private FieldValue[] mStaticFieldValues; 35 private Field[] mInstanceFields; 36 private long mStaticFieldsSize; 37 private long mInstanceSize; 38 AhatClassObj(long id, String className)39 AhatClassObj(long id, String className) { 40 super(id); 41 mClassName = className; 42 } 43 initialize(AhatClassObj superClass, long instanceSize, Field[] instanceFields, long staticFieldsSize)44 void initialize(AhatClassObj superClass, 45 long instanceSize, 46 Field[] instanceFields, 47 long staticFieldsSize) { 48 mSuperClassObj = superClass; 49 mInstanceSize = instanceSize; 50 mInstanceFields = instanceFields; 51 mStaticFieldsSize = staticFieldsSize; 52 } 53 initialize(AhatInstance classLoader, FieldValue[] staticFields)54 void initialize(AhatInstance classLoader, FieldValue[] staticFields) { 55 mClassLoader = classLoader; 56 mStaticFieldValues = staticFields; 57 } 58 59 @Override getExtraJavaSize()60 long getExtraJavaSize() { 61 return mStaticFieldsSize; 62 } 63 64 /** 65 * Returns the name of the class this is a class object for. 66 * For example, "java.lang.String". 67 * 68 * @return the name of the class 69 */ getName()70 public String getName() { 71 return mClassName; 72 } 73 74 /** 75 * Returns the superclass of this class object. 76 * 77 * @return the superclass object 78 */ getSuperClassObj()79 public AhatClassObj getSuperClassObj() { 80 return mSuperClassObj; 81 } 82 83 /** 84 * Returns the class loader of this class object. 85 * 86 * @return the class loader object 87 */ getClassLoader()88 public AhatInstance getClassLoader() { 89 return mClassLoader; 90 } 91 92 /** 93 * Returns the size of instances of this object. 94 * The size returned is as reported in the heap dump. 95 * 96 * @return the class instance size 97 */ getInstanceSize()98 public long getInstanceSize() { 99 return mInstanceSize; 100 } 101 102 /** 103 * Returns the static field values for this class object. 104 * 105 * @return the static field values 106 */ getStaticFieldValues()107 public List<FieldValue> getStaticFieldValues() { 108 return Arrays.asList(mStaticFieldValues); 109 } 110 111 /** 112 * Returns the fields of instances of this class. 113 * Does not include fields from the super class of this class. 114 * 115 * @return the instance fields 116 */ getInstanceFields()117 public Field[] getInstanceFields() { 118 return mInstanceFields; 119 } 120 121 @Override getReferences()122 Iterable<Reference> getReferences() { 123 List<Reference> refs = new AbstractList<Reference>() { 124 @Override 125 public int size() { 126 return mStaticFieldValues.length; 127 } 128 129 @Override 130 public Reference get(int index) { 131 FieldValue field = mStaticFieldValues[index]; 132 Value value = field.value; 133 if (value != null && value.isAhatInstance()) { 134 return new Reference(AhatClassObj.this, 135 "." + field.name, 136 value.asAhatInstance(), 137 Reachability.STRONG); 138 } 139 return null; 140 } 141 }; 142 return new SkipNullsIterator(refs); 143 } 144 isClassObj()145 @Override public boolean isClassObj() { 146 return true; 147 } 148 asClassObj()149 @Override public AhatClassObj asClassObj() { 150 return this; 151 } 152 toString()153 @Override public String toString() { 154 return "class " + mClassName; 155 } 156 newPlaceHolderInstance()157 @Override AhatInstance newPlaceHolderInstance() { 158 return new AhatPlaceHolderClassObj(this); 159 } 160 } 161