| /* |
| * 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; |
| |
| import com.sun.org.apache.bcel.internal.classfile.CodeException; |
| |
| /** |
| * This class represents an exception handler, i.e., specifies the region where |
| * a handler is active and an instruction where the actual handling is done. |
| * pool as parameters. Opposed to the JVM specification the end of the handled |
| * region is set to be inclusive, i.e. all instructions between start and end |
| * are protected including the start and end instructions (handles) themselves. |
| * The end of the region is automatically mapped to be exclusive when calling |
| * getCodeException(), i.e., there is no difference semantically. |
| * |
| * @see MethodGen |
| * @see CodeException |
| * @see InstructionHandle |
| */ |
| public final class CodeExceptionGen implements InstructionTargeter, Cloneable { |
| |
| private InstructionHandle start_pc; |
| private InstructionHandle end_pc; |
| private InstructionHandle handler_pc; |
| private ObjectType catch_type; |
| |
| |
| /** |
| * Add an exception handler, i.e., specify region where a handler is active and an |
| * instruction where the actual handling is done. |
| * |
| * @param start_pc Start of handled region (inclusive) |
| * @param end_pc End of handled region (inclusive) |
| * @param handler_pc Where handling is done |
| * @param catch_type which exception is handled, null for ANY |
| */ |
| public CodeExceptionGen(final InstructionHandle start_pc, final InstructionHandle end_pc, |
| final InstructionHandle handler_pc, final ObjectType catch_type) { |
| setStartPC(start_pc); |
| setEndPC(end_pc); |
| setHandlerPC(handler_pc); |
| this.catch_type = catch_type; |
| } |
| |
| |
| /** |
| * Get CodeException object.<BR> |
| * |
| * This relies on that the instruction list has already been dumped |
| * to byte code or or that the `setPositions' methods has been |
| * called for the instruction list. |
| * |
| * @param cp constant pool |
| */ |
| public CodeException getCodeException( final ConstantPoolGen cp ) { |
| return new CodeException(start_pc.getPosition(), end_pc.getPosition() |
| + end_pc.getInstruction().getLength(), handler_pc.getPosition(), |
| (catch_type == null) ? 0 : cp.addClass(catch_type)); |
| } |
| |
| |
| /* Set start of handler |
| * @param start_pc Start of handled region (inclusive) |
| */ |
| public void setStartPC( final InstructionHandle start_pc ) { // TODO could be package-protected? |
| BranchInstruction.notifyTarget(this.start_pc, start_pc, this); |
| this.start_pc = start_pc; |
| } |
| |
| |
| /* Set end of handler |
| * @param end_pc End of handled region (inclusive) |
| */ |
| public void setEndPC( final InstructionHandle end_pc ) { // TODO could be package-protected? |
| BranchInstruction.notifyTarget(this.end_pc, end_pc, this); |
| this.end_pc = end_pc; |
| } |
| |
| |
| /* Set handler code |
| * @param handler_pc Start of handler |
| */ |
| public void setHandlerPC( final InstructionHandle handler_pc ) { // TODO could be package-protected? |
| BranchInstruction.notifyTarget(this.handler_pc, handler_pc, this); |
| this.handler_pc = handler_pc; |
| } |
| |
| |
| /** |
| * @param old_ih old target, either start or end |
| * @param new_ih new target |
| */ |
| @Override |
| public void updateTarget( final InstructionHandle old_ih, final InstructionHandle new_ih ) { |
| boolean targeted = false; |
| if (start_pc == old_ih) { |
| targeted = true; |
| setStartPC(new_ih); |
| } |
| if (end_pc == old_ih) { |
| targeted = true; |
| setEndPC(new_ih); |
| } |
| if (handler_pc == old_ih) { |
| targeted = true; |
| setHandlerPC(new_ih); |
| } |
| if (!targeted) { |
| throw new ClassGenException("Not targeting " + old_ih + ", but {" + start_pc + ", " |
| + end_pc + ", " + handler_pc + "}"); |
| } |
| } |
| |
| |
| /** |
| * @return true, if ih is target of this handler |
| */ |
| @Override |
| public boolean containsTarget( final InstructionHandle ih ) { |
| return (start_pc == ih) || (end_pc == ih) || (handler_pc == ih); |
| } |
| |
| |
| /** Sets the type of the Exception to catch. Set 'null' for ANY. */ |
| public void setCatchType( final ObjectType catch_type ) { |
| this.catch_type = catch_type; |
| } |
| |
| |
| /** Gets the type of the Exception to catch, 'null' for ANY. */ |
| public ObjectType getCatchType() { |
| return catch_type; |
| } |
| |
| |
| /** @return start of handled region (inclusive) |
| */ |
| public InstructionHandle getStartPC() { |
| return start_pc; |
| } |
| |
| |
| /** @return end of handled region (inclusive) |
| */ |
| public InstructionHandle getEndPC() { |
| return end_pc; |
| } |
| |
| |
| /** @return start of handler |
| */ |
| public InstructionHandle getHandlerPC() { |
| return handler_pc; |
| } |
| |
| |
| @Override |
| public String toString() { |
| return "CodeExceptionGen(" + start_pc + ", " + end_pc + ", " + handler_pc + ")"; |
| } |
| |
| |
| @Override |
| public Object clone() { |
| try { |
| return super.clone(); |
| } catch (final CloneNotSupportedException e) { |
| throw new Error("Clone Not Supported"); // never happens |
| } |
| } |
| } |