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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.runtime.UnwarrantedOptimismException.INVALID_PROGRAM_POINT;
import java.util.function.Function;
import jdk.nashorn.internal.codegen.types.Type;
import jdk.nashorn.internal.ir.annotations.Immutable;
/**
* IR base for accessing/indexing nodes.
*
* @see AccessNode
* @see IndexNode
*/
@Immutable
public abstract class BaseNode extends Expression implements FunctionCall, Optimistic {
/** Base Node. */
protected final Expression base;
private final boolean isFunction;
/** Callsite type for this node, if overridden optimistically or conservatively depending on coercion */
protected final Type type;
/** Program point id */
protected final int programPoint;
/**
* Constructor
*
* @param token token
* @param finish finish
* @param base base node
* @param isFunction is this a function
*/
public BaseNode(final long token, final int finish, final Expression base, final boolean isFunction) {
super(token, base.getStart(), finish);
this.base = base;
this.isFunction = isFunction;
this.type = null;
this.programPoint = INVALID_PROGRAM_POINT;
}
/**
* Copy constructor for immutable nodes
* @param baseNode node to inherit from
* @param base base
* @param isFunction is this a function
* @param callSiteType the callsite type for this base node, either optimistic or conservative
* @param programPoint program point id
*/
protected BaseNode(final BaseNode baseNode, final Expression base, final boolean isFunction, final Type callSiteType, final int programPoint) {
super(baseNode);
this.base = base;
this.isFunction = isFunction;
this.type = callSiteType;
this.programPoint = programPoint;
}
/**
* Get the base node for this access
* @return the base node
*/
public Expression getBase() {
return base;
}
@Override
public boolean isFunction() {
return isFunction;
}
@Override
public Type getType(final Function<Symbol, Type> localVariableTypes) {
return type == null ? getMostPessimisticType() : type;
}
@Override
public int getProgramPoint() {
return programPoint;
}
@Override
public Type getMostOptimisticType() {
return Type.INT;
}
@Override
public Type getMostPessimisticType() {
return Type.OBJECT;
}
@Override
public boolean canBeOptimistic() {
return true;
}
/**
* Mark this node as being the callee operand of a {@link CallNode}.
* @return a base node identical to this one in all aspects except with its function flag set.
*/
public abstract BaseNode setIsFunction();
}
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