| /* |
| * 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.BitwiseNegationExpression; |
| import org.codehaus.groovy.ast.expr.Expression; |
| import org.codehaus.groovy.ast.expr.NotExpression; |
| import org.codehaus.groovy.ast.expr.UnaryMinusExpression; |
| import org.codehaus.groovy.ast.expr.UnaryPlusExpression; |
| 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 |
| */ |
| 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); |
| } |
| } |