| /* |
| * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package jdk.nashorn.internal.ir; |
| |
| import jdk.nashorn.internal.ir.annotations.Immutable; |
| import jdk.nashorn.internal.ir.visitor.NodeVisitor; |
| |
| /** |
| * IR representation of a catch clause. |
| */ |
| @Immutable |
| public final class CatchNode extends Statement { |
| private static final long serialVersionUID = 1L; |
| |
| /** Exception identifier. */ |
| private final IdentNode exception; |
| |
| /** Exception condition. */ |
| private final Expression exceptionCondition; |
| |
| /** Catch body. */ |
| private final Block body; |
| |
| private final boolean isSyntheticRethrow; |
| |
| /** |
| * Constructors |
| * |
| * @param lineNumber lineNumber |
| * @param token token |
| * @param finish finish |
| * @param exception variable name of exception |
| * @param exceptionCondition exception condition |
| * @param body catch body |
| * @param isSyntheticRethrow true if this node is a synthetically generated rethrow node. |
| */ |
| public CatchNode(final int lineNumber, final long token, final int finish, final IdentNode exception, |
| final Expression exceptionCondition, final Block body, final boolean isSyntheticRethrow) { |
| super(lineNumber, token, finish); |
| this.exception = exception == null ? null : exception.setIsInitializedHere(); |
| this.exceptionCondition = exceptionCondition; |
| this.body = body; |
| this.isSyntheticRethrow = isSyntheticRethrow; |
| } |
| |
| private CatchNode(final CatchNode catchNode, final IdentNode exception, final Expression exceptionCondition, |
| final Block body, final boolean isSyntheticRethrow) { |
| super(catchNode); |
| this.exception = exception; |
| this.exceptionCondition = exceptionCondition; |
| this.body = body; |
| this.isSyntheticRethrow = isSyntheticRethrow; |
| } |
| |
| /** |
| * Assist in IR navigation. |
| * @param visitor IR navigating visitor. |
| */ |
| @Override |
| public Node accept(final NodeVisitor<? extends LexicalContext> visitor) { |
| if (visitor.enterCatchNode(this)) { |
| return visitor.leaveCatchNode( |
| setException((IdentNode)exception.accept(visitor)). |
| setExceptionCondition(exceptionCondition == null ? null : (Expression)exceptionCondition.accept(visitor)). |
| setBody((Block)body.accept(visitor))); |
| } |
| |
| return this; |
| } |
| |
| @Override |
| public boolean isTerminal() { |
| return body.isTerminal(); |
| } |
| |
| @Override |
| public void toString(final StringBuilder sb, final boolean printTypes) { |
| sb.append(" catch ("); |
| exception.toString(sb, printTypes); |
| |
| if (exceptionCondition != null) { |
| sb.append(" if "); |
| exceptionCondition.toString(sb, printTypes); |
| } |
| sb.append(')'); |
| } |
| |
| /** |
| * Get the identifier representing the exception thrown |
| * @return the exception identifier |
| */ |
| public IdentNode getException() { |
| return exception; |
| } |
| |
| /** |
| * Get the exception condition for this catch block |
| * @return the exception condition |
| */ |
| public Expression getExceptionCondition() { |
| return exceptionCondition; |
| } |
| |
| /** |
| * Reset the exception condition for this catch block |
| * @param exceptionCondition the new exception condition |
| * @return new or same CatchNode |
| */ |
| public CatchNode setExceptionCondition(final Expression exceptionCondition) { |
| if (this.exceptionCondition == exceptionCondition) { |
| return this; |
| } |
| return new CatchNode(this, exception, exceptionCondition, body, isSyntheticRethrow); |
| } |
| |
| /** |
| * Get the body for this catch block |
| * @return the catch block body |
| */ |
| public Block getBody() { |
| return body; |
| } |
| |
| /** |
| * Resets the exception of a catch block |
| * @param exception new exception |
| * @return new catch node if changed, same otherwise |
| */ |
| public CatchNode setException(final IdentNode exception) { |
| if (this.exception == exception) { |
| return this; |
| } |
| return new CatchNode(this, exception, exceptionCondition, body, isSyntheticRethrow); |
| } |
| |
| private CatchNode setBody(final Block body) { |
| if (this.body == body) { |
| return this; |
| } |
| return new CatchNode(this, exception, exceptionCondition, body, isSyntheticRethrow); |
| } |
| |
| /** |
| * Is this catch block a non-JavaScript constructor, for example created as |
| * part of the rethrow mechanism of a finally block in Lower? Then we just |
| * pass the exception on and need not unwrap whatever is in the ECMAException |
| * object catch symbol |
| * @return true if a finally synthetic rethrow |
| */ |
| public boolean isSyntheticRethrow() { |
| return isSyntheticRethrow; |
| } |
| } |