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Groovy: A powerful, dynamic language for the JVM
/**
* 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.classgen.asm;
import org.codehaus.groovy.ast.ClassHelper;
import org.codehaus.groovy.ast.expr.*;
import org.codehaus.groovy.runtime.ScriptBytecodeAdapter;
/**
* A helper class used to generate bytecode for unary expressions. AST transformations willing to use
* a custom unary expression helper may set the {@link WriterControllerFactory} node metadata on a
* class node to provide a custom {@link WriterController} which would in turn use a custom expression
* helper.
*
* @see BinaryExpressionHelper
*
* @author Cedric Champeau
*/
public class UnaryExpressionHelper {
// unary plus, unary minus, bitwise negation
static final MethodCaller unaryPlus = MethodCaller.newStatic(ScriptBytecodeAdapter.class, "unaryPlus");
static final MethodCaller unaryMinus = MethodCaller.newStatic(ScriptBytecodeAdapter.class, "unaryMinus");
static final MethodCaller bitwiseNegate = MethodCaller.newStatic(ScriptBytecodeAdapter.class, "bitwiseNegate");
private final WriterController controller;
public UnaryExpressionHelper(final WriterController controller) {
this.controller = controller;
}
public void writeUnaryPlus(UnaryPlusExpression expression) {
Expression subExpression = expression.getExpression();
subExpression.visit(controller.getAcg());
controller.getOperandStack().box();
unaryPlus.call(controller.getMethodVisitor());
controller.getOperandStack().replace(ClassHelper.OBJECT_TYPE);
controller.getAssertionWriter().record(expression);
}
public void writeUnaryMinus(UnaryMinusExpression expression) {
Expression subExpression = expression.getExpression();
subExpression.visit(controller.getAcg());
controller.getOperandStack().box();
unaryMinus.call(controller.getMethodVisitor());
controller.getOperandStack().replace(ClassHelper.OBJECT_TYPE);
controller.getAssertionWriter().record(expression);
}
public void writeBitwiseNegate(BitwiseNegationExpression expression) {
Expression subExpression = expression.getExpression();
subExpression.visit(controller.getAcg());
controller.getOperandStack().box();
bitwiseNegate.call(controller.getMethodVisitor());
controller.getOperandStack().replace(ClassHelper.OBJECT_TYPE);
controller.getAssertionWriter().record(expression);
}
public void writeNotExpression(NotExpression expression) {
Expression subExpression = expression.getExpression();
int mark = controller.getOperandStack().getStackLength();
subExpression.visit(controller.getAcg());
controller.getOperandStack().castToBool(mark, true);
BytecodeHelper.negateBoolean(controller.getMethodVisitor());
controller.getAssertionWriter().record(expression);
}
}