89 lines
2.9 KiB
Java
89 lines
2.9 KiB
Java
/*
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* Copyright (C) 2015 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.ahat;
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import com.android.tools.perflib.heap.ClassObj;
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import com.android.tools.perflib.heap.Field;
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import com.android.tools.perflib.heap.Instance;
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import java.io.File;
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import java.io.IOException;
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import java.util.Map;
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/**
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* The TestDump class is used to get an AhatSnapshot for the test-dump
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* program.
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*/
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public class TestDump {
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// It can take on the order of a second to parse and process the test-dump
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// hprof. To avoid repeating this overhead for each test case, we cache the
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// loaded instance of TestDump and reuse it when possible. In theory the
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// test cases should not be able to modify the cached snapshot in a way that
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// is visible to other test cases.
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private static TestDump mCachedTestDump = null;
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private AhatSnapshot mSnapshot = null;
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/**
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* Load the test-dump.hprof file.
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* The location of the file is read from the system property
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* "ahat.test.dump.hprof", which is expected to be set on the command line.
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* For example:
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* java -Dahat.test.dump.hprof=test-dump.hprof -jar ahat-tests.jar
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*
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* An IOException is thrown if there is a failure reading the hprof file.
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*/
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private TestDump() throws IOException {
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String hprof = System.getProperty("ahat.test.dump.hprof");
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mSnapshot = AhatSnapshot.fromHprof(new File(hprof));
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}
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/**
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* Get the AhatSnapshot for the test dump program.
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*/
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public AhatSnapshot getAhatSnapshot() {
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return mSnapshot;
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}
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/**
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* Return the value of a field in the DumpedStuff instance in the
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* snapshot for the test-dump program.
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*/
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public Object getDumpedThing(String name) {
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ClassObj main = mSnapshot.findClass("Main");
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Instance stuff = null;
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for (Map.Entry<Field, Object> fields : main.getStaticFieldValues().entrySet()) {
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if ("stuff".equals(fields.getKey().getName())) {
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stuff = (Instance) fields.getValue();
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}
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}
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return InstanceUtils.getField(stuff, name);
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}
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/**
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* Get the test dump.
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* An IOException is thrown if there is an error reading the test dump hprof
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* file.
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* To improve performance, this returns a cached instance of the TestDump
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* when possible.
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*/
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public static synchronized TestDump getTestDump() throws IOException {
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if (mCachedTestDump == null) {
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mCachedTestDump = new TestDump();
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}
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return mCachedTestDump;
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}
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}
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