Mercurial > hg > openjdk > jigsaw > nashorn
view src/jdk/nashorn/internal/ir/UnaryNode.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 | e15806b9d716 |
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 static jdk.nashorn.internal.parser.TokenType.BIT_NOT; import static jdk.nashorn.internal.parser.TokenType.CONVERT; import static jdk.nashorn.internal.parser.TokenType.DECPOSTFIX; import static jdk.nashorn.internal.parser.TokenType.INCPOSTFIX; import jdk.nashorn.internal.codegen.types.Type; import jdk.nashorn.internal.ir.visitor.NodeVisitor; import jdk.nashorn.internal.parser.Token; import jdk.nashorn.internal.parser.TokenType; import jdk.nashorn.internal.runtime.Source; /** * UnaryNode nodes represent single operand operations. */ public class UnaryNode extends Node implements Assignment<Node> { /** Right hand side argument. */ private Node rhs; /** * Constructor * * @param source the source * @param token token * @param rhs expression */ public UnaryNode(final Source source, final long token, final Node rhs) { super(source, token, Token.descPosition(token)); this.start = Math.min(rhs.getStart(), Token.descPosition(token)); this.finish = Math.max(Token.descPosition(token) + Token.descLength(token), rhs.getFinish()); this.rhs = rhs; } /** * Copy constructor * * @param unaryNode source node * @param cs copy state */ protected UnaryNode(final UnaryNode unaryNode, final CopyState cs) { super(unaryNode); this.rhs = cs.existingOrCopy(unaryNode.rhs); } /** * Is this an assignment - i.e. that mutates something such as a++ * * @return true if assignment */ @Override public boolean isAssignment() { switch (tokenType()) { case DECPOSTFIX: case DECPREFIX: case INCPOSTFIX: case INCPREFIX: return true; default: return false; } } @Override public boolean isSelfModifying() { return isAssignment(); } @Override public Type getWidestOperationType() { return isAssignment() ? Type.NUMBER : Type.OBJECT; } @Override public Node getAssignmentDest() { return isAssignment() ? rhs() : null; } @Override public Node setAssignmentDest(Node n) { return setRHS(n); } @Override public Node getAssignmentSource() { return getAssignmentDest(); } @Override public boolean equals(final Object other) { if (!super.equals(other)) { return false; } return rhs.equals(((UnaryNode)other).rhs()); } @Override public int hashCode() { return super.hashCode() ^ rhs().hashCode(); } @Override protected Node copy(final CopyState cs) { return new UnaryNode(this, cs); } /** * Assist in IR navigation. * @param visitor IR navigating visitor. */ @Override public Node accept(final NodeVisitor visitor) { if (visitor.enterUnaryNode(this) != null) { return visitor.leaveUnaryNode(setRHS(rhs.accept(visitor))); } return this; } @Override public void toString(final StringBuilder sb) { final TokenType type = tokenType(); final String name = type.getName(); final boolean isPostfix = type == DECPOSTFIX || type == INCPOSTFIX; final boolean isConvert = type == CONVERT && getSymbol() != null; boolean rhsParen = type.needsParens(rhs().tokenType(), false); int convertPos = 0; if (isConvert) { convertPos = sb.length(); sb.append("("); sb.append(getType()); sb.append(")("); } if (!isPostfix && !isConvert) { if (name == null) { sb.append(type.name()); rhsParen = true; } else { sb.append(name); if (type.ordinal() > BIT_NOT.ordinal()) { sb.append(' '); } } } if (rhsParen) { sb.append('('); } rhs().toString(sb); if (rhsParen) { sb.append(')'); } if (isPostfix) { sb.append(type == DECPOSTFIX ? "--" : "++"); } if (isConvert) { // strip extra cast parenthesis which makes the printout harder to read final boolean endsWithParenthesis = sb.charAt(sb.length() - 1) == ')'; if (!endsWithParenthesis) { sb.append(')'); } else { sb.setCharAt(convertPos, ' '); } } } /** * Get the right hand side of this if it is inherited by a binary expression, * or just the expression itself if still Unary * * @see BinaryNode * * @return right hand side or expression node */ public Node rhs() { return rhs; } /** * Reset the right hand side of this if it is inherited by a binary expression, * or just the expression itself if still Unary * * @see BinaryNode * * @param rhs right hand side or expression node * @return a node equivalent to this one except for the requested change. */ public UnaryNode setRHS(final Node rhs) { if(this.rhs == rhs) return this; final UnaryNode n = (UnaryNode)clone(); n.rhs = rhs; return n; } }