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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.codegen.ObjectClassGenerator.DEBUG_FIELDS;
import jdk.nashorn.internal.codegen.ObjectClassGenerator;
import jdk.nashorn.internal.codegen.types.Type;
import jdk.nashorn.internal.ir.visitor.NodeVisitor;
import jdk.nashorn.internal.runtime.Source;
/**
* IR representation of an indexed access (brackets operator.)
*
*/
public class IndexNode extends BaseNode implements TypeOverride<IndexNode> {
/** Property ident. */
private Node index;
private boolean hasCallSiteType;
/**
* Constructors
*
* @param source the source
* @param token token
* @param finish finish
* @param base base node for access
* @param index index for access
*/
public IndexNode(final Source source, final long token, final int finish, final Node base, final Node index) {
super(source, token, finish, base);
this.index = index;
}
/**
* Copy constructor
*
* @param indexNode source node
*/
public IndexNode(final IndexNode indexNode) {
this(indexNode, new CopyState());
}
private IndexNode(final IndexNode indexNode, final CopyState cs) {
super(indexNode, cs);
index = cs.existingOrCopy(indexNode.index);
}
@Override
protected Node copy(final CopyState cs) {
return new IndexNode(this, cs);
}
@Override
public boolean equals(final Object other) {
if (!super.equals(other)) {
return false;
}
return index.equals(((IndexNode)other).getIndex());
}
@Override
public int hashCode() {
return super.hashCode() ^ getIndex().hashCode();
}
@Override
public Node accept(final NodeVisitor visitor) {
if (visitor.enterIndexNode(this) != null) {
base = base.accept(visitor);
index = index.accept(visitor);
return visitor.leaveIndexNode(this);
}
return this;
}
@Override
public void toString(final StringBuilder sb) {
final boolean needsParen = tokenType().needsParens(base.tokenType(), true);
if (hasCallSiteType) {
sb.append('{');
final String desc = getType().getDescriptor();
sb.append(desc.charAt(desc.length() - 1) == ';' ? "O" : getType().getDescriptor());
sb.append('}');
}
if (needsParen) {
sb.append('(');
}
base.toString(sb);
if (needsParen) {
sb.append(')');
}
sb.append('[');
index.toString(sb);
sb.append(']');
}
/**
* Get the index expression for this IndexNode
* @return the index
*/
public Node getIndex() {
return index;
}
/**
* Reset the index expression for this IndexNode
* @param index a new index expression
*/
public void setIndex(final Node index) {
this.index = index;
}
@Override
public IndexNode setType(final Type type) {
if (DEBUG_FIELDS && !Type.areEquivalent(getSymbol().getSymbolType(), type)) {
ObjectClassGenerator.LOG.info(getClass().getName() + " " + this + " => " + type + " instead of " + getType());
}
hasCallSiteType = true;
getSymbol().setTypeOverride(type);
return this;
}
@Override
public boolean canHaveCallSiteType() {
return true; //carried by the symbol and always the same nodetype==symboltype
}
}
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