com.google.gwt.dev.jjs.impl.OptimizerStats Maven / Gradle / Ivy
/*
* Copyright 2010 Google Inc.
*
* 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.google.gwt.dev.jjs.impl;
import java.util.ArrayList;
import java.util.List;
/**
* Stores statistics on the results of running an optimizer pass.
*/
public class OptimizerStats {
private List children = new ArrayList();
private final String name;
private int numMods = 0;
private int numVisits = 0;
public OptimizerStats(String name) {
this.name = name;
}
/**
* Add a child stats object.
*/
public void add(OptimizerStats childStats) {
children.add(childStats);
}
/**
* @return true if the AST changed during this pass.
*/
public boolean didChange() {
if (numMods > 0) {
return true;
}
for (OptimizerStats child : children) {
if (child.didChange()) {
return true;
}
}
return false;
}
/**
* Retrieves an immutable list of child stats objects. Don't modify this list.
*/
public List getChildren() {
return children;
}
public String getName() {
return name;
}
/**
* @return the number of times the AST was modified by the optimizer
*/
public int getNumMods() {
int childMods = 0;
for (OptimizerStats child : children) {
childMods += child.getNumMods();
}
return numMods + childMods;
}
/**
* @return the number of nodes visited by the optimizer
*/
public int getNumVisits() {
int childVisits = 0;
for (OptimizerStats child : children) {
childVisits += child.getNumVisits();
}
return numVisits + childVisits;
}
/**
* Return a human-readable string representing the values of all statistics.
*/
public String prettyPrint() {
StringBuilder builder = new StringBuilder();
prettyPrint(builder, 0);
return builder.toString();
}
/**
* Increment the number of times the tree was modified.
*/
public OptimizerStats recordModified() {
this.numMods++;
return this;
}
/**
* Increment the number of times the tree was modified.
*
* @param numMods the number of changes made to the AST.
*/
public OptimizerStats recordModified(int numMods) {
this.numMods += numMods;
return this;
}
/**
* Increment the number of times tree nodes were visited.
*/
public OptimizerStats recordVisit() {
this.numVisits++;
return this;
}
/**
* Increment the number of times tree nodes were visited.
*/
public OptimizerStats recordVisits(int numVisits) {
this.numVisits += numVisits;
return this;
}
private void prettyPrint(StringBuilder builder, int level) {
int visits = getNumVisits();
int mods = getNumMods();
String ratioString = " ----";
if (visits > 0) {
ratioString = String.format(
"%5.2f", ((double) mods / (double) visits) * 100.0);
}
String entry = String.format("%-6s%% (%6d/%6d)", ratioString, mods, visits);
builder.append(String.format("%12s: %-22s ", name, entry));
if (children.size() > 0) {
builder.append("\n ");
for (int i = 0; i <= level; i++) {
builder.append(" ");
}
for (OptimizerStats child : children) {
child.prettyPrint(builder, ++level);
}
}
}
}