Richard Uhler | b730b78 | 2015-07-15 16:01:58 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2015 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; |
| 18 | |
| 19 | import com.android.tools.perflib.heap.ArrayInstance; |
| 20 | import com.android.tools.perflib.heap.ClassInstance; |
| 21 | import com.android.tools.perflib.heap.ClassObj; |
| 22 | import com.android.tools.perflib.heap.Instance; |
| 23 | import com.android.tools.perflib.heap.Type; |
| 24 | import java.awt.image.BufferedImage; |
| 25 | |
| 26 | /** |
| 27 | * Utilities for extracting information from hprof instances. |
| 28 | */ |
| 29 | class InstanceUtils { |
| 30 | /** |
| 31 | * Returns true if the given instance is an instance of a class with the |
| 32 | * given name. |
| 33 | */ |
| 34 | public static boolean isInstanceOfClass(Instance inst, String className) { |
| 35 | ClassObj cls = inst.getClassObj(); |
| 36 | return (cls != null && className.equals(cls.getClassName())); |
| 37 | } |
| 38 | |
| 39 | /** |
| 40 | * Read the char[] value from an hprof Instance. |
| 41 | * Returns null if the object can't be interpreted as a char[]. |
| 42 | */ |
| 43 | private static char[] asCharArray(Instance inst) { |
| 44 | if (! (inst instanceof ArrayInstance)) { |
| 45 | return null; |
| 46 | } |
| 47 | |
| 48 | ArrayInstance array = (ArrayInstance) inst; |
| 49 | if (array.getArrayType() != Type.CHAR) { |
| 50 | return null; |
| 51 | } |
| 52 | return array.asCharArray(0, array.getValues().length); |
| 53 | } |
| 54 | |
| 55 | /** |
| 56 | * Read the byte[] value from an hprof Instance. |
| 57 | * Returns null if the instance is not a byte array. |
| 58 | */ |
| 59 | private static byte[] asByteArray(Instance inst) { |
| 60 | if (! (inst instanceof ArrayInstance)) { |
| 61 | return null; |
| 62 | } |
| 63 | |
| 64 | ArrayInstance array = (ArrayInstance)inst; |
| 65 | if (array.getArrayType() != Type.BYTE) { |
| 66 | return null; |
| 67 | } |
| 68 | |
| 69 | Object[] objs = array.getValues(); |
| 70 | byte[] bytes = new byte[objs.length]; |
| 71 | for (int i = 0; i < objs.length; i++) { |
| 72 | Byte b = (Byte)objs[i]; |
| 73 | bytes[i] = b.byteValue(); |
| 74 | } |
| 75 | return bytes; |
| 76 | } |
| 77 | |
| 78 | |
| 79 | // Read the string value from an hprof Instance. |
| 80 | // Returns null if the object can't be interpreted as a string. |
| 81 | public static String asString(Instance inst) { |
| 82 | if (!isInstanceOfClass(inst, "java.lang.String")) { |
| 83 | return null; |
| 84 | } |
| 85 | char[] value = getCharArrayField(inst, "value"); |
| 86 | return (value == null) ? null : new String(value); |
| 87 | } |
| 88 | |
| 89 | /** |
| 90 | * Read the bitmap data for the given android.graphics.Bitmap object. |
| 91 | * Returns null if the object isn't for android.graphics.Bitmap or the |
| 92 | * bitmap data couldn't be read. |
| 93 | */ |
| 94 | public static BufferedImage asBitmap(Instance inst) { |
| 95 | if (!isInstanceOfClass(inst, "android.graphics.Bitmap")) { |
| 96 | return null; |
| 97 | } |
| 98 | |
| 99 | Integer width = getIntField(inst, "mWidth"); |
| 100 | if (width == null) { |
| 101 | return null; |
| 102 | } |
| 103 | |
| 104 | Integer height = getIntField(inst, "mHeight"); |
| 105 | if (height == null) { |
| 106 | return null; |
| 107 | } |
| 108 | |
| 109 | byte[] buffer = getByteArrayField(inst, "mBuffer"); |
| 110 | if (buffer == null) { |
| 111 | return null; |
| 112 | } |
| 113 | |
| 114 | // Convert the raw data to an image |
| 115 | // Convert BGRA to ABGR |
| 116 | int[] abgr = new int[height * width]; |
| 117 | for (int i = 0; i < abgr.length; i++) { |
| 118 | abgr[i] = ( |
| 119 | (((int)buffer[i * 4 + 3] & 0xFF) << 24) + |
| 120 | (((int)buffer[i * 4 + 0] & 0xFF) << 16) + |
| 121 | (((int)buffer[i * 4 + 1] & 0xFF) << 8) + |
| 122 | ((int)buffer[i * 4 + 2] & 0xFF)); |
| 123 | } |
| 124 | |
| 125 | BufferedImage bitmap = new BufferedImage( |
| 126 | width, height, BufferedImage.TYPE_4BYTE_ABGR); |
| 127 | bitmap.setRGB(0, 0, width, height, abgr, 0, width); |
| 128 | return bitmap; |
| 129 | } |
| 130 | |
| 131 | /** |
| 132 | * Read a field of an instance. |
| 133 | * Returns null if the field value is null or if the field couldn't be read. |
| 134 | */ |
| 135 | private static Object getField(Instance inst, String fieldName) { |
| 136 | if (!(inst instanceof ClassInstance)) { |
| 137 | return null; |
| 138 | } |
| 139 | |
| 140 | ClassInstance clsinst = (ClassInstance) inst; |
| 141 | Object value = null; |
| 142 | int count = 0; |
| 143 | for (ClassInstance.FieldValue field : clsinst.getValues()) { |
| 144 | if (fieldName.equals(field.getField().getName())) { |
| 145 | value = field.getValue(); |
| 146 | count++; |
| 147 | } |
| 148 | } |
| 149 | return count == 1 ? value : null; |
| 150 | } |
| 151 | |
| 152 | /** |
| 153 | * Read a reference field of an instance. |
| 154 | * Returns null if the field value is null, or if the field couldn't be read. |
| 155 | */ |
| 156 | private static Instance getRefField(Instance inst, String fieldName) { |
| 157 | Object value = getField(inst, fieldName); |
| 158 | if (!(value instanceof Instance)) { |
| 159 | return null; |
| 160 | } |
| 161 | return (Instance)value; |
| 162 | } |
| 163 | |
| 164 | /** |
| 165 | * Read an int field of an instance. |
| 166 | * The field is assumed to be an int type. |
| 167 | * Returns null if the field value is not an int or could not be read. |
| 168 | */ |
| 169 | private static Integer getIntField(Instance inst, String fieldName) { |
| 170 | Object value = getField(inst, fieldName); |
| 171 | if (!(value instanceof Integer)) { |
| 172 | return null; |
| 173 | } |
| 174 | return (Integer)value; |
| 175 | } |
| 176 | |
| 177 | /** |
| 178 | * Read the given field from the given instance. |
| 179 | * The field is assumed to be a byte[] field. |
| 180 | * Returns null if the field value is null, not a byte[] or could not be read. |
| 181 | */ |
| 182 | private static byte[] getByteArrayField(Instance inst, String fieldName) { |
| 183 | Object value = getField(inst, fieldName); |
| 184 | if (!(value instanceof Instance)) { |
| 185 | return null; |
| 186 | } |
| 187 | return asByteArray((Instance)value); |
| 188 | } |
| 189 | |
| 190 | private static char[] getCharArrayField(Instance inst, String fieldName) { |
| 191 | Object value = getField(inst, fieldName); |
| 192 | if (!(value instanceof Instance)) { |
| 193 | return null; |
| 194 | } |
| 195 | return asCharArray((Instance)value); |
| 196 | } |
| 197 | |
| 198 | // Return the bitmap instance associated with this object, or null if there |
| 199 | // is none. This works for android.graphics.Bitmap instances and their |
| 200 | // underlying Byte[] instances. |
| 201 | public static Instance getAssociatedBitmapInstance(Instance inst) { |
| 202 | ClassObj cls = inst.getClassObj(); |
| 203 | if (cls == null) { |
| 204 | return null; |
| 205 | } |
| 206 | |
| 207 | if ("android.graphics.Bitmap".equals(cls.getClassName())) { |
| 208 | return inst; |
| 209 | } |
| 210 | |
| 211 | if (inst instanceof ArrayInstance) { |
| 212 | ArrayInstance array = (ArrayInstance)inst; |
| 213 | if (array.getArrayType() == Type.BYTE && inst.getHardReferences().size() == 1) { |
| 214 | Instance ref = inst.getHardReferences().get(0); |
| 215 | ClassObj clsref = ref.getClassObj(); |
| 216 | if (clsref != null && "android.graphics.Bitmap".equals(clsref.getClassName())) { |
| 217 | return ref; |
| 218 | } |
| 219 | } |
| 220 | } |
| 221 | return null; |
| 222 | } |
| 223 | |
| 224 | /** |
| 225 | * Assuming inst represents a DexCache object, return the dex location for |
| 226 | * that dex cache. Returns null if the given instance doesn't represent a |
| 227 | * DexCache object or the location could not be found. |
| 228 | */ |
| 229 | public static String getDexCacheLocation(Instance inst) { |
| 230 | if (isInstanceOfClass(inst, "java.lang.DexCache")) { |
| 231 | Instance location = getRefField(inst, "location"); |
| 232 | if (location != null) { |
| 233 | return asString(location); |
| 234 | } |
| 235 | } |
| 236 | return null; |
| 237 | } |
| 238 | } |