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/*
* Copyright (C) 2012 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.gallery3d.util;
import android.util.Log;
import com.android.gallery3d.common.Utils;
import java.io.DataOutputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map.Entry;
// ProfileData keeps profiling samples in a tree structure.
// The addSample() method adds a sample. The dumpToFile() method saves the data
// to a file. The reset() method clears all samples.
public class ProfileData {
@SuppressWarnings("unused")
private static final String TAG = "ProfileData";
private static class Node {
public int id; // this is the name of this node, mapped from mNameToId
public Node parent;
public int sampleCount;
public ArrayList<Node> children;
public Node(Node parent, int id) {
this.parent = parent;
this.id = id;
}
}
private Node mRoot;
private int mNextId;
private HashMap<String, Integer> mNameToId;
private DataOutputStream mOut;
private byte mScratch[] = new byte[4]; // scratch space for writeInt()
public ProfileData() {
mRoot = new Node(null, -1); // The id of the root node is unused.
mNameToId = new HashMap<String, Integer>();
}
public void reset() {
mRoot = new Node(null, -1);
mNameToId.clear();
mNextId = 0;
}
private int nameToId(String name) {
Integer id = mNameToId.get(name);
if (id == null) {
id = ++mNextId; // The tool doesn't want id=0, so we start from 1.
mNameToId.put(name, id);
}
return id;
}
public void addSample(String[] stack) {
int[] ids = new int[stack.length];
for (int i = 0; i < stack.length; i++) {
ids[i] = nameToId(stack[i]);
}
Node node = mRoot;
for (int i = stack.length - 1; i >= 0; i--) {
if (node.children == null) {
node.children = new ArrayList<Node>();
}
int id = ids[i];
ArrayList<Node> children = node.children;
int j;
for (j = 0; j < children.size(); j++) {
if (children.get(j).id == id) break;
}
if (j == children.size()) {
children.add(new Node(node, id));
}
node = children.get(j);
}
node.sampleCount++;
}
public void dumpToFile(String filename) {
try {
mOut = new DataOutputStream(new FileOutputStream(filename));
// Start record
writeInt(0);
writeInt(3);
writeInt(1);
writeInt(20000); // Sampling period: 20ms
writeInt(0);
// Samples
writeAllStacks(mRoot, 0);
// End record
writeInt(0);
writeInt(1);
writeInt(0);
writeAllSymbols();
} catch (IOException ex) {
Log.w("Failed to dump to file", ex);
} finally {
Utils.closeSilently(mOut);
}
}
// Writes out one stack, consisting of N+2 words:
// first word: sample count
// second word: depth of the stack (N)
// N words: each word is the id of one address in the stack
private void writeOneStack(Node node, int depth) throws IOException {
writeInt(node.sampleCount);
writeInt(depth);
while (depth-- > 0) {
writeInt(node.id);
node = node.parent;
}
}
private void writeAllStacks(Node node, int depth) throws IOException {
if (node.sampleCount > 0) {
writeOneStack(node, depth);
}
ArrayList<Node> children = node.children;
if (children != null) {
for (int i = 0; i < children.size(); i++) {
writeAllStacks(children.get(i), depth + 1);
}
}
}
// Writes out the symbol table. Each line is like:
// 0x17e java.util.ArrayList.isEmpty(ArrayList.java:319)
private void writeAllSymbols() throws IOException {
for (Entry<String, Integer> entry : mNameToId.entrySet()) {
mOut.writeBytes(String.format("0x%x %s\n", entry.getValue(), entry.getKey()));
}
}
private void writeInt(int v) throws IOException {
mScratch[0] = (byte) v;
mScratch[1] = (byte) (v >> 8);
mScratch[2] = (byte) (v >> 16);
mScratch[3] = (byte) (v >> 24);
mOut.write(mScratch);
}
}
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