com.google.gwt.dev.jjs.impl.gflow.constants.ConstantsAnalysis Maven / Gradle / Ivy
/*
* Copyright 2008 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.gflow.constants;
import com.google.gwt.dev.jjs.impl.gflow.Analysis;
import com.google.gwt.dev.jjs.impl.gflow.AssumptionMap;
import com.google.gwt.dev.jjs.impl.gflow.AssumptionUtil;
import com.google.gwt.dev.jjs.impl.gflow.IntegratedAnalysis;
import com.google.gwt.dev.jjs.impl.gflow.cfg.Cfg;
import com.google.gwt.dev.jjs.impl.gflow.cfg.CfgEdge;
import com.google.gwt.dev.jjs.impl.gflow.cfg.CfgNode;
import com.google.gwt.dev.jjs.impl.gflow.cfg.CfgTransformer;
/**
* Constant propagation optimization.
*
* Detects a situation when variable value is constant and replaces variable
* access with constant value.
* As of now supports only locals & parameters.
*/
public class ConstantsAnalysis implements
Analysis, CfgEdge, Cfg, ConstantsAssumption>,
IntegratedAnalysis, CfgEdge, CfgTransformer, Cfg, ConstantsAssumption> {
@Override
public ConstantsFlowFunction getFlowFunction() {
return new ConstantsFlowFunction();
}
@Override
public ConstantsIntegratedFlowFunction getIntegratedFlowFunction() {
return new ConstantsIntegratedFlowFunction();
}
@Override
public void setInitialGraphAssumptions(Cfg graph,
AssumptionMap assumptionMap) {
AssumptionUtil.setAssumptions(graph.getGraphInEdges(),
ConstantsAssumption.TOP, assumptionMap);
}
}