blob: 7ee3ff24ed65a3646fc73e1dee108872b7d92439 [file] [log] [blame]
/*
* Copyright (C) 2015 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.
*/
package com.android.ahat;
import com.android.tools.perflib.heap.ArrayInstance;
import com.android.tools.perflib.heap.ClassInstance;
import com.android.tools.perflib.heap.ClassObj;
import com.android.tools.perflib.heap.Instance;
import com.android.tools.perflib.heap.Type;
import java.awt.image.BufferedImage;
/**
* Utilities for extracting information from hprof instances.
*/
class InstanceUtils {
/**
* Returns true if the given instance is an instance of a class with the
* given name.
*/
public static boolean isInstanceOfClass(Instance inst, String className) {
ClassObj cls = inst.getClassObj();
return (cls != null && className.equals(cls.getClassName()));
}
/**
* Read the char[] value from an hprof Instance.
* Returns null if the object can't be interpreted as a char[].
*/
private static char[] asCharArray(Instance inst) {
if (! (inst instanceof ArrayInstance)) {
return null;
}
ArrayInstance array = (ArrayInstance) inst;
if (array.getArrayType() != Type.CHAR) {
return null;
}
return array.asCharArray(0, array.getValues().length);
}
/**
* Read the byte[] value from an hprof Instance.
* Returns null if the instance is not a byte array.
*/
private static byte[] asByteArray(Instance inst) {
if (! (inst instanceof ArrayInstance)) {
return null;
}
ArrayInstance array = (ArrayInstance)inst;
if (array.getArrayType() != Type.BYTE) {
return null;
}
Object[] objs = array.getValues();
byte[] bytes = new byte[objs.length];
for (int i = 0; i < objs.length; i++) {
Byte b = (Byte)objs[i];
bytes[i] = b.byteValue();
}
return bytes;
}
// Read the string value from an hprof Instance.
// Returns null if the object can't be interpreted as a string.
public static String asString(Instance inst) {
if (!isInstanceOfClass(inst, "java.lang.String")) {
return null;
}
char[] value = getCharArrayField(inst, "value");
return (value == null) ? null : new String(value);
}
/**
* Read the bitmap data for the given android.graphics.Bitmap object.
* Returns null if the object isn't for android.graphics.Bitmap or the
* bitmap data couldn't be read.
*/
public static BufferedImage asBitmap(Instance inst) {
if (!isInstanceOfClass(inst, "android.graphics.Bitmap")) {
return null;
}
Integer width = getIntField(inst, "mWidth");
if (width == null) {
return null;
}
Integer height = getIntField(inst, "mHeight");
if (height == null) {
return null;
}
byte[] buffer = getByteArrayField(inst, "mBuffer");
if (buffer == null) {
return null;
}
// Convert the raw data to an image
// Convert BGRA to ABGR
int[] abgr = new int[height * width];
for (int i = 0; i < abgr.length; i++) {
abgr[i] = (
(((int)buffer[i * 4 + 3] & 0xFF) << 24) +
(((int)buffer[i * 4 + 0] & 0xFF) << 16) +
(((int)buffer[i * 4 + 1] & 0xFF) << 8) +
((int)buffer[i * 4 + 2] & 0xFF));
}
BufferedImage bitmap = new BufferedImage(
width, height, BufferedImage.TYPE_4BYTE_ABGR);
bitmap.setRGB(0, 0, width, height, abgr, 0, width);
return bitmap;
}
/**
* Read a field of an instance.
* Returns null if the field value is null or if the field couldn't be read.
*/
private static Object getField(Instance inst, String fieldName) {
if (!(inst instanceof ClassInstance)) {
return null;
}
ClassInstance clsinst = (ClassInstance) inst;
Object value = null;
int count = 0;
for (ClassInstance.FieldValue field : clsinst.getValues()) {
if (fieldName.equals(field.getField().getName())) {
value = field.getValue();
count++;
}
}
return count == 1 ? value : null;
}
/**
* Read a reference field of an instance.
* Returns null if the field value is null, or if the field couldn't be read.
*/
private static Instance getRefField(Instance inst, String fieldName) {
Object value = getField(inst, fieldName);
if (!(value instanceof Instance)) {
return null;
}
return (Instance)value;
}
/**
* Read an int field of an instance.
* The field is assumed to be an int type.
* Returns null if the field value is not an int or could not be read.
*/
private static Integer getIntField(Instance inst, String fieldName) {
Object value = getField(inst, fieldName);
if (!(value instanceof Integer)) {
return null;
}
return (Integer)value;
}
/**
* Read the given field from the given instance.
* The field is assumed to be a byte[] field.
* Returns null if the field value is null, not a byte[] or could not be read.
*/
private static byte[] getByteArrayField(Instance inst, String fieldName) {
Object value = getField(inst, fieldName);
if (!(value instanceof Instance)) {
return null;
}
return asByteArray((Instance)value);
}
private static char[] getCharArrayField(Instance inst, String fieldName) {
Object value = getField(inst, fieldName);
if (!(value instanceof Instance)) {
return null;
}
return asCharArray((Instance)value);
}
// Return the bitmap instance associated with this object, or null if there
// is none. This works for android.graphics.Bitmap instances and their
// underlying Byte[] instances.
public static Instance getAssociatedBitmapInstance(Instance inst) {
ClassObj cls = inst.getClassObj();
if (cls == null) {
return null;
}
if ("android.graphics.Bitmap".equals(cls.getClassName())) {
return inst;
}
if (inst instanceof ArrayInstance) {
ArrayInstance array = (ArrayInstance)inst;
if (array.getArrayType() == Type.BYTE && inst.getHardReferences().size() == 1) {
Instance ref = inst.getHardReferences().get(0);
ClassObj clsref = ref.getClassObj();
if (clsref != null && "android.graphics.Bitmap".equals(clsref.getClassName())) {
return ref;
}
}
}
return null;
}
/**
* Assuming inst represents a DexCache object, return the dex location for
* that dex cache. Returns null if the given instance doesn't represent a
* DexCache object or the location could not be found.
*/
public static String getDexCacheLocation(Instance inst) {
if (isInstanceOfClass(inst, "java.lang.DexCache")) {
Instance location = getRefField(inst, "location");
if (location != null) {
return asString(location);
}
}
return null;
}
}