| /* |
| * 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; |
| |
| import static org.codehaus.groovy.ast.ClassHelper.isPrimitiveType; |
| |
| /** |
| * 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; |
| |
| // TODO make @CS lookup smarter so that we don't need both these maps |
| private final Map<Object, FieldNode> const2Objects = new HashMap<Object, FieldNode>(); |
| private final Map<Object, FieldNode> const2Prims = new HashMap<Object, FieldNode>(); |
| private int index; |
| 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; |
| const2Objects.clear(); |
| const2Prims.clear(); |
| missingFields.clear(); |
| index = 0; |
| 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(ClassNode.EMPTY_ARRAY)); |
| } |
| } |
| } |
| |
| private void addMissingFields() { |
| for (FieldNode f : missingFields) { |
| 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 |
| |
| boolean isPrimitive = isPrimitiveType(constantExpression.getType()); |
| FieldNode field = isPrimitive ? const2Prims.get(n) : const2Objects.get(n); |
| if (field != null) { |
| constantExpression.setConstantName(field.getName()); |
| return; |
| } |
| String name; |
| do { |
| name = "$const$" + index++; |
| } while (currentClass.getDeclaredField(name) != null); |
| // TODO consider moving initcode to <clinit> and remaking field final |
| field = new FieldNode(name, |
| Opcodes.ACC_PRIVATE | Opcodes.ACC_STATIC | Opcodes.ACC_SYNTHETIC, |
| constantExpression.getType(), |
| currentClass, |
| constantExpression); |
| field.setSynthetic(true); |
| missingFields.add(field); |
| constantExpression.setConstantName(field.getName()); |
| if (isPrimitive) { |
| const2Prims.put(n, field); |
| } else { |
| const2Objects.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 |
| */ |
| } |
| } |