/*
* Copyright 2007 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 com.google.gwt.dev.jjs.ast.Context;
import com.google.gwt.dev.jjs.ast.JMethod;
import com.google.gwt.dev.jjs.ast.JMethodCall;
import com.google.gwt.dev.jjs.ast.JModVisitor;
import com.google.gwt.dev.jjs.ast.JNullType;
import com.google.gwt.dev.jjs.ast.JProgram;
import com.google.gwt.dev.jjs.ast.JType;
import com.google.gwt.dev.util.log.speedtracer.CompilerEventType;
import com.google.gwt.dev.util.log.speedtracer.SpeedTracerLogger;
import com.google.gwt.dev.util.log.speedtracer.SpeedTracerLogger.Event;
import java.util.List;
/**
* For each JMethodCall that contains a specialization, retarget the method
* to the specialized call if possible. Depends on call tightening,
* staticizing, and finalizing having been successful on the
* method of interest.
*/
public class MethodCallSpecializer {
private class MethodCallSpecializingVisitor extends JModVisitor {
@Override
public void endVisit(JMethodCall x, Context ctx) {
// Don't do anything if the method binding isn't statically known
if (!x.getTarget().isStatic()) {
return;
}
JMethod method = x.getTarget();
JMethod.Specialization specialization = method.getSpecialization();
if (specialization == null) {
return;
}
List<JType> params = specialization.getParams();
if (params.size() == x.getArgs().size()) {
for (int i = 0; i < params.size(); i++) {
JType argType = x.getArgs().get(i).getType().getUnderlyingType();
if (argType instanceof JNullType) {
return;
}
// see if the args passed to the function can be cast to the
// specialization pattern
JType qType = params.get(i).getUnderlyingType();
if (!program.typeOracle.canTriviallyCast(argType, qType)) {
// params don't match
return;
}
}
JMethod targetMethod = specialization.getTargetMethod();
if (targetMethod != null) {
JMethodCall call = new JMethodCall(x.getSourceInfo(),
x.getInstance(), targetMethod);
call.addArgs(x.getArgs());
ctx.replaceMe(call);
}
}
}
}
public static final String NAME = MethodCallSpecializer.class.getSimpleName();
public static OptimizerStats exec(JProgram program) {
Event optimizeEvent = SpeedTracerLogger.start(CompilerEventType.OPTIMIZE, "optimizer", NAME);
OptimizerStats stats = new MethodCallSpecializer(program).execImpl();
optimizeEvent.end("didChange", "" + stats.didChange());
return stats;
}
private final JProgram program;
private MethodCallSpecializer(JProgram program) {
this.program = program;
}
private OptimizerStats execImpl() {
MethodCallSpecializingVisitor specializer =
new MethodCallSpecializingVisitor();
specializer.accept(program);
return new OptimizerStats(NAME).recordModified(specializer.getNumMods());
}
}