Mercurial > hg > openjdk > jigsaw > nashorn
view src/jdk/nashorn/internal/ir/TryNode.java @ 143:4be452026847
8010652: Eliminate non-child references in Block/FunctionNode, and make few node types immutable
Reviewed-by: jlaskey, lagergren
author | attila |
---|---|
date | Sat, 23 Mar 2013 00:58:39 +0100 |
parents | e478708faa22 |
children |
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/* * 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 java.util.ArrayList; import java.util.Collections; import java.util.List; import jdk.nashorn.internal.codegen.Label; import jdk.nashorn.internal.ir.annotations.Ignore; import jdk.nashorn.internal.ir.visitor.NodeVisitor; import jdk.nashorn.internal.runtime.Source; /** * IR representation of a TRY statement. */ public class TryNode extends Node { /** Try chain. */ @Ignore //don't print, will be apparent from the AST private TryNode next; /** Try statements. */ private Block body; /** List of catch clauses. */ private List<Block> catchBlocks; /** Finally clause. */ private Block finallyBody; /** Exit label. */ private Label exit; /** Exception symbol. */ private Symbol exception; /** Catchall exception for finally expansion, where applicable */ private Symbol finallyCatchAll; /** * Constructor * * @param source the source * @param token token * @param finish finish * @param next next try node in chain */ public TryNode(final Source source, final long token, final int finish, final TryNode next) { super(source, token, finish); this.next = next; this.exit = new Label("exit"); } private TryNode(final TryNode tryNode, final CopyState cs) { super(tryNode); final List<Block> newCatchBlocks = new ArrayList<>(); for (final Block block : tryNode.catchBlocks) { newCatchBlocks.add((Block)cs.existingOrCopy(block)); } this.next = (TryNode)cs.existingOrSame(tryNode.getNext()); this.body = (Block)cs.existingOrCopy(tryNode.getBody()); this.catchBlocks = newCatchBlocks; this.finallyBody = (Block)cs.existingOrCopy(tryNode.getFinallyBody()); this.exit = new Label(tryNode.getExit()); } @Override protected Node copy(final CopyState cs) { return new TryNode(this, cs); } /** * Assist in IR navigation. * @param visitor IR navigating visitor. */ @Override public Node accept(final NodeVisitor visitor) { if (visitor.enterTryNode(this) != null) { // Need to do first for termination analysis. if (finallyBody != null) { finallyBody = (Block)finallyBody.accept(visitor); } body = (Block)body.accept(visitor); final List<Block> newCatchBlocks = new ArrayList<>(catchBlocks.size()); for (final Block catchBlock : catchBlocks) { newCatchBlocks.add((Block)catchBlock.accept(visitor)); } this.catchBlocks = newCatchBlocks; return visitor.leaveTryNode(this); } return this; } @Override public void toString(final StringBuilder sb) { sb.append("try"); } /** * Get the body for this try block * @return body */ public Block getBody() { return body; } /** * Reset the body of this try block * @param body new body */ public void setBody(final Block body) { this.body = body; } /** * Get the catches for this try block * @return a list of catch nodes */ public List<CatchNode> getCatches() { final List<CatchNode> catches = new ArrayList<>(catchBlocks.size()); for (final Block catchBlock : catchBlocks) { catches.add((CatchNode)catchBlock.getStatements().get(0)); } return catches; } /** * Returns true if the specified block is the body of this try block, or any of its catch blocks. * @param block the block * @return true if the specified block is the body of this try block, or any of its catch blocks. */ public boolean isChildBlock(Block block) { return body == block || catchBlocks.contains(block); } /** * Get the catch blocks for this try block * @return a list of blocks */ public List<Block> getCatchBlocks() { return Collections.unmodifiableList(catchBlocks); } /** * Set the catch blocks of this try * @param catchBlocks list of catch blocks */ public void setCatchBlocks(final List<Block> catchBlocks) { this.catchBlocks = catchBlocks; } /** * Get the exception symbol for this try block * @return a symbol for the compiler to store the exception in */ public Symbol getException() { return exception; } /** * Set the exception symbol for this try block * @param exception a symbol for the compiler to store the exception in */ public void setException(final Symbol exception) { this.exception = exception; } /** * Get the catch all symbol for this try block * @return catch all symbol */ public Symbol getFinallyCatchAll() { return this.finallyCatchAll; } /** * If a finally block exists, the synthetic catchall needs another symbol to * store its throwable * @param finallyCatchAll a symbol for the finally catch all exception */ public void setFinallyCatchAll(final Symbol finallyCatchAll) { this.finallyCatchAll = finallyCatchAll; } /** * Get the exit label for this try block * @return exit label */ public Label getExit() { return exit; } /** * Set the exit label for this try block * @param exit label */ public void setExit(final Label exit) { this.exit = exit; } /** * Get the body of the finally clause for this try * @return finally body, or null if no finally */ public Block getFinallyBody() { return finallyBody; } /** * Set the finally body of this try * @param finallyBody new finally body */ public void setFinallyBody(final Block finallyBody) { this.finallyBody = finallyBody; } /** * Get next try node in try chain * @return next try node */ public TryNode getNext() { return next; } /** * Set next try node in try chain * @param next next try node */ public void setNext(final TryNode next) { this.next = next; } }