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OptimizerVisitor.java
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OptimizerVisitor.java
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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.codehaus.groovy.control;
import org.codehaus.groovy.ast.ClassCodeExpressionTransformer;
import org.codehaus.groovy.ast.ClassHelper;
import org.codehaus.groovy.ast.ClassNode;
import org.codehaus.groovy.ast.FieldNode;
import org.codehaus.groovy.ast.expr.ClosureExpression;
import org.codehaus.groovy.ast.expr.ConstantExpression;
import org.codehaus.groovy.ast.expr.Expression;
import org.objectweb.asm.Opcodes;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
/**
* Visitor to produce several optimizations:
* <ul>
* <li>to replace numbered constants with references to static fields</li>
* <li>remove superfluous references to GroovyObject interface</li>
* </ul>
*/
public class OptimizerVisitor extends ClassCodeExpressionTransformer {
private ClassNode currentClass;
private SourceUnit source;
private final Map const2Var = new HashMap();
private final List<FieldNode> missingFields = new LinkedList<FieldNode>();
public OptimizerVisitor(CompilationUnit cu) {
}
public void visitClass(ClassNode node, SourceUnit source) {
this.currentClass = node;
this.source = source;
const2Var.clear();
missingFields.clear();
super.visitClass(node);
addMissingFields();
pruneUnneededGroovyObjectInterface(node);
}
private void pruneUnneededGroovyObjectInterface(ClassNode node) {
ClassNode superClass = node.getSuperClass();
boolean isSuperGroovy = superClass.isDerivedFromGroovyObject();
if (isSuperGroovy) {
ClassNode[] interfaces = node.getInterfaces();
boolean needsFix = false;
for (ClassNode classNode : interfaces) {
if (classNode.equals(ClassHelper.GROOVY_OBJECT_TYPE)) {
needsFix = true;
break;
}
}
if (needsFix) {
List<ClassNode> newInterfaces = new ArrayList<ClassNode>(interfaces.length);
for (ClassNode classNode : interfaces) {
if (!classNode.equals(ClassHelper.GROOVY_OBJECT_TYPE)) {
newInterfaces.add(classNode);
}
}
node.setInterfaces(newInterfaces.toArray(new ClassNode[newInterfaces.size()]));
}
}
}
private void addMissingFields() {
for (Object missingField : missingFields) {
FieldNode f = (FieldNode) missingField;
currentClass.addField(f);
}
}
private void setConstField(ConstantExpression constantExpression) {
final Object n = constantExpression.getValue();
if (!(n instanceof Number)) return;
if (n instanceof Integer || n instanceof Double) return;
if (n instanceof Long && (0L== (Long) n || 1L==(Long) n )) return; // LCONST_0, LCONST_1
FieldNode field = (FieldNode) const2Var.get(n);
if (field!=null) {
constantExpression.setConstantName(field.getName());
return;
}
final String name = "$const$" + const2Var.size();
//TODO: this part here needs a bit of rethinking. If it can happen that the field is defined already,
// then is this code still valid?
field = currentClass.getDeclaredField(name);
if (field==null) {
field = new FieldNode(name,
Opcodes.ACC_PRIVATE|Opcodes.ACC_STATIC|Opcodes.ACC_SYNTHETIC| Opcodes.ACC_FINAL,
constantExpression.getType(),
currentClass,
constantExpression
);
field.setSynthetic(true);
missingFields.add(field);
}
constantExpression.setConstantName(field.getName());
const2Var.put(n, field);
}
public Expression transform(Expression exp) {
if (exp == null) return null;
if (!currentClass.isInterface() && exp.getClass() == ConstantExpression.class) {
setConstField((ConstantExpression)exp);
}
return exp.transformExpression(this);
}
protected SourceUnit getSourceUnit() {
return source;
}
public void visitClosureExpression(ClosureExpression expression) {
/*
* GROOVY-3339 - do nothing - so that numbers don't get replaced by cached constants in closure classes
*/
}
}