Mercurial > hg > openjdk > jigsaw > nashorn
view src/jdk/nashorn/internal/ir/debug/PrintVisitor.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 | 5a1b0714df0e |
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.debug; import java.util.List; import jdk.nashorn.internal.ir.AccessNode; import jdk.nashorn.internal.ir.Block; import jdk.nashorn.internal.ir.BreakNode; import jdk.nashorn.internal.ir.CallNode; import jdk.nashorn.internal.ir.CaseNode; import jdk.nashorn.internal.ir.CatchNode; import jdk.nashorn.internal.ir.ContinueNode; import jdk.nashorn.internal.ir.DoWhileNode; import jdk.nashorn.internal.ir.ExecuteNode; import jdk.nashorn.internal.ir.ForNode; import jdk.nashorn.internal.ir.FunctionNode; import jdk.nashorn.internal.ir.IfNode; import jdk.nashorn.internal.ir.IndexNode; import jdk.nashorn.internal.ir.LabelNode; import jdk.nashorn.internal.ir.LineNumberNode; import jdk.nashorn.internal.ir.Node; import jdk.nashorn.internal.ir.ReturnNode; import jdk.nashorn.internal.ir.RuntimeNode; import jdk.nashorn.internal.ir.SplitNode; import jdk.nashorn.internal.ir.SwitchNode; import jdk.nashorn.internal.ir.Symbol; import jdk.nashorn.internal.ir.ThrowNode; import jdk.nashorn.internal.ir.TryNode; import jdk.nashorn.internal.ir.UnaryNode; import jdk.nashorn.internal.ir.VarNode; import jdk.nashorn.internal.ir.WhileNode; import jdk.nashorn.internal.ir.WithNode; import jdk.nashorn.internal.ir.visitor.NodeVisitor; /** * Print out the AST as human readable source code. * This works both on lowered and unlowered ASTs * * see the flags --print-parse and --print-lower-parse */ public final class PrintVisitor extends NodeVisitor { /** Tab width */ private static final int TABWIDTH = 1; /** Composing buffer. */ private final StringBuilder sb; /** Indentation factor. */ private int indent; /** Line separator. */ private final String EOLN; /** Print line numbers */ private final boolean printLineNumbers; /** * Constructor. */ public PrintVisitor() { this(true); } /** * Constructor * * @param printLineNumbers should line number nodes be included in the output? */ public PrintVisitor(final boolean printLineNumbers) { this.EOLN = System.lineSeparator(); this.sb = new StringBuilder(); this.printLineNumbers = printLineNumbers; } /** * Constructor * * @param root a node from which to start printing code */ public PrintVisitor(final Node root) { this(root, true); } /** * Constructor * * @param root a node from which to start printing code * @param printLineNumbers should line numbers nodes be included in the output? */ public PrintVisitor(final Node root, final boolean printLineNumbers) { this(printLineNumbers); visit(root); } private void visit(final Node root) { root.accept(this); } @Override public String toString() { return sb.append(EOLN).toString(); } /** * Insert spaces before a statement. */ private void indent() { for (int i = indent; i > 0; i--) { sb.append(' '); } } /* * Visits. */ @Override public Node enterAccessNode(final AccessNode accessNode) { accessNode.toString(sb); return null; } @Override public Node enterBlock(final Block block) { sb.append(' '); sb.append('{'); indent += TABWIDTH; final boolean isFunction = block instanceof FunctionNode; final List<Node> statements = block.getStatements(); boolean lastLineNumber = false; for (final Node statement : statements) { if (printLineNumbers || !lastLineNumber) { sb.append(EOLN); indent(); } if (statement instanceof UnaryNode) { statement.toString(sb); } else { statement.accept(this); } lastLineNumber = statement instanceof LineNumberNode; final Symbol symbol = statement.getSymbol(); if (symbol != null) { sb.append(" ["); sb.append(symbol.toString()); sb.append(']'); } final char lastChar = sb.charAt(sb.length() - 1); if (lastChar != '}' && lastChar != ';') { if (printLineNumbers || !lastLineNumber) { sb.append(';'); } } if (statement.hasGoto()) { sb.append(" [GOTO]"); } if (statement.isTerminal()) { sb.append(" [TERMINAL]"); } } indent -= TABWIDTH; sb.append(EOLN); indent(); sb.append("}"); if (isFunction) { sb.append(EOLN); } return null; } @Override public Node enterBreakNode(final BreakNode breakNode) { breakNode.toString(sb); return null; } @Override public Node enterCallNode(final CallNode callNode) { callNode.toString(sb); return null; } @Override public Node enterContinueNode(final ContinueNode continueNode) { continueNode.toString(sb); return null; } @Override public Node enterDoWhileNode(final DoWhileNode doWhileNode) { sb.append("do"); doWhileNode.getBody().accept(this); sb.append(' '); doWhileNode.toString(sb); return null; } @Override public Node enterExecuteNode(final ExecuteNode executeNode) { final Node expression = executeNode.getExpression(); if (expression instanceof UnaryNode) { expression.toString(sb); } else { expression.accept(this); } return null; } @Override public Node enterForNode(final ForNode forNode) { forNode.toString(sb); forNode.getBody().accept(this); return null; } @Override public Node enterFunctionNode(final FunctionNode functionNode) { functionNode.toString(sb); enterBlock(functionNode); return null; } @Override public Node enterIfNode(final IfNode ifNode) { ifNode.toString(sb); ifNode.getPass().accept(this); final Block fail = ifNode.getFail(); if (fail != null) { sb.append(" else "); fail.accept(this); } return null; } @Override public Node enterIndexNode(final IndexNode indexNode) { indexNode.toString(sb); return null; } @Override public Node enterLabelNode(final LabelNode labeledNode) { indent -= TABWIDTH; indent(); indent += TABWIDTH; labeledNode.toString(sb); labeledNode.getBody().accept(this); return null; } @Override public Node enterLineNumberNode(final LineNumberNode lineNumberNode) { if (printLineNumbers) { lineNumberNode.toString(sb); } return null; } @Override public Node enterReturnNode(final ReturnNode returnNode) { returnNode.toString(sb); return null; } @Override public Node enterRuntimeNode(final RuntimeNode runtimeNode) { runtimeNode.toString(sb); return null; } @Override public Node enterSplitNode(final SplitNode splitNode) { splitNode.toString(sb); sb.append(EOLN); indent += TABWIDTH; indent(); return splitNode; } @Override public Node leaveSplitNode(final SplitNode splitNode) { sb.append("</split>"); sb.append(EOLN); indent -= TABWIDTH; indent(); return splitNode; } @Override public Node enterSwitchNode(final SwitchNode switchNode) { switchNode.toString(sb); sb.append(" {"); final List<CaseNode> cases = switchNode.getCases(); for (final CaseNode caseNode : cases) { sb.append(EOLN); indent(); caseNode.toString(sb); indent += TABWIDTH; caseNode.getBody().accept(this); indent -= TABWIDTH; sb.append(EOLN); } sb.append(EOLN); indent(); sb.append("}"); return null; } @Override public Node enterThrowNode(final ThrowNode throwNode) { throwNode.toString(sb); return null; } @Override public Node enterTryNode(final TryNode tryNode) { tryNode.toString(sb); tryNode.getBody().accept(this); final List<Block> catchBlocks = tryNode.getCatchBlocks(); for (final Block catchBlock : catchBlocks) { final CatchNode catchNode = (CatchNode) catchBlock.getStatements().get(0); catchNode.toString(sb); catchNode.getBody().accept(this); } final Block finallyBody = tryNode.getFinallyBody(); if (finallyBody != null) { sb.append(" finally "); finallyBody.accept(this); } return null; } @Override public Node enterVarNode(final VarNode varNode) { sb.append("var "); varNode.getName().toString(sb); final Node init = varNode.getInit(); if(init != null) { sb.append(" = "); init.accept(this); } return null; } @Override public Node enterWhileNode(final WhileNode whileNode) { whileNode.toString(sb); whileNode.getBody().accept(this); return null; } @Override public Node enterWithNode(final WithNode withNode) { withNode.toString(sb); withNode.getBody().accept(this); return null; } }