| /* |
| * reserved comment block |
| * DO NOT REMOVE OR ALTER! |
| */ |
| /* |
| * 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 com.sun.org.apache.bcel.internal.generic; |
| |
| /** |
| * Equality of instructions isn't clearly to be defined. You might |
| * wish, for example, to compare whether instructions have the same |
| * meaning. E.g., whether two INVOKEVIRTUALs describe the same |
| * call.<br>The DEFAULT comparator however, considers two instructions |
| * to be equal if they have same opcode and point to the same indexes |
| * (if any) in the constant pool or the same local variable index. Branch |
| * instructions must have the same target. |
| * |
| * @see Instruction |
| * @version $Id: InstructionComparator.java 1749597 2016-06-21 20:28:51Z ggregory $ |
| */ |
| public interface InstructionComparator { |
| |
| InstructionComparator DEFAULT = new InstructionComparator() { |
| |
| @Override |
| public boolean equals( final Instruction i1, final Instruction i2 ) { |
| if (i1.getOpcode() == i2.getOpcode()) { |
| if (i1 instanceof BranchInstruction) { |
| // BIs are never equal to make targeters work correctly (BCEL-195) |
| return false; |
| // } else if (i1 == i2) { TODO consider adding this shortcut |
| // return true; // this must be AFTER the BI test |
| } else if (i1 instanceof ConstantPushInstruction) { |
| return ((ConstantPushInstruction) i1).getValue().equals( |
| ((ConstantPushInstruction) i2).getValue()); |
| } else if (i1 instanceof IndexedInstruction) { |
| return ((IndexedInstruction) i1).getIndex() == ((IndexedInstruction) i2) |
| .getIndex(); |
| } else if (i1 instanceof NEWARRAY) { |
| return ((NEWARRAY) i1).getTypecode() == ((NEWARRAY) i2).getTypecode(); |
| } else { |
| return true; |
| } |
| } |
| return false; |
| } |
| }; |
| |
| |
| boolean equals( Instruction i1, Instruction i2 ); |
| } |