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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 a property access (period operator.)
*
*/
public class AccessNode extends BaseNode implements TypeOverride<AccessNode> {
/** Property ident. */
private IdentNode property;
/** Does this node have a type override */
private boolean hasCallSiteType;
/**
* Constructor
*
* @param source source code
* @param token token
* @param finish finish
* @param base base node
* @param property property
*/
public AccessNode(final Source source, final long token, final int finish, final Node base, final IdentNode property) {
super(source, token, finish, base);
this.start = base.getStart();
this.property = property.setIsPropertyName();
}
/**
* Copy constructor
*
* @param accessNode source node
*/
public AccessNode(final AccessNode accessNode) {
this(accessNode, new CopyState());
}
/**
* Internal copy constructor
*
* @param accessNode source node
* @param cs copy state
*/
protected AccessNode(final AccessNode accessNode, final CopyState cs) {
super(accessNode, cs);
this.property = (IdentNode)cs.existingOrCopy(accessNode.getProperty());
}
@Override
protected Node copy(final CopyState cs) {
return new AccessNode(this, cs);
}
@Override
public boolean equals(final Object other) {
if (!super.equals(other)) {
return false;
}
final AccessNode accessNode = (AccessNode)other;
return property.equals(accessNode.getProperty());
}
@Override
public int hashCode() {
return super.hashCode() ^ property.hashCode();
}
/**
* Assist in IR navigation.
* @param visitor IR navigating visitor.
*/
@Override
public Node accept(final NodeVisitor visitor) {
if (visitor.enterAccessNode(this) != null) {
base = base.accept(visitor);
property = (IdentNode)property.accept(visitor);
return visitor.leaveAccessNode(this);
}
return this;
}
@Override
public void toString(final StringBuilder sb) {
final boolean needsParen = tokenType().needsParens(getBase().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('.');
sb.append(property.getName());
}
/**
* Get the property
*
* @return the property IdentNode
*/
public IdentNode getProperty() {
return property;
}
@Override
public AccessNode setType(final Type type) {
if (DEBUG_FIELDS && !Type.areEquivalent(getSymbol().getSymbolType(), type)) {
ObjectClassGenerator.LOG.info(getClass().getName() + " " + this + " => " + type + " instead of " + getType());
}
property = property.setType(type);
getSymbol().setTypeOverride(type); //always a temp so this is fine.
hasCallSiteType = true;
return this;
}
@Override
public boolean canHaveCallSiteType() {
return true; //carried by the symbol and always the same nodetype==symboltype
}
}
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