/*
* 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.AssumptionMap;
import com.google.gwt.dev.jjs.impl.gflow.IntegratedFlowFunction;
import com.google.gwt.dev.jjs.impl.gflow.TransformationFunction.Transformation;
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;
/**
* Integrated flow function for ConstantsAnalysis. First try a transformation,
* fall back to flow function if no transformation is possible.
*/
public class ConstantsIntegratedFlowFunction
implements
IntegratedFlowFunction<CfgNode<?>, CfgEdge, CfgTransformer, Cfg, ConstantsAssumption> {
private static final ConstantsFlowFunction FLOW_FUNCTION = new ConstantsFlowFunction();
private final ConstantsTransformationFunction transformationFunction;
public ConstantsIntegratedFlowFunction() {
transformationFunction = new ConstantsTransformationFunction();
}
public Transformation<CfgTransformer, Cfg> interpretOrReplace(
CfgNode<?> node, Cfg graph,
AssumptionMap<CfgEdge, ConstantsAssumption> assumptionMap) {
Transformation<CfgTransformer, Cfg> transformation = transformationFunction.transform(
node, graph, assumptionMap);
if (transformation != null) {
return transformation;
}
FLOW_FUNCTION.interpret(node, graph, assumptionMap);
return null;
}
}