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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 java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import jdk.nashorn.internal.codegen.CompileUnit;
import jdk.nashorn.internal.codegen.Label;
import jdk.nashorn.internal.codegen.MethodEmitter;
import jdk.nashorn.internal.ir.annotations.Ignore;
import jdk.nashorn.internal.ir.annotations.Reference;
import jdk.nashorn.internal.ir.visitor.NodeVisitor;
/**
* Node indicating code is split across classes.
*/
public class SplitNode extends Node {
/** Split node method name. */
private final String name;
/** Compilation unit. */
private CompileUnit compileUnit;
/** Method emitter for current method. */
private MethodEmitter method;
/** Method emitter for caller method. */
private MethodEmitter caller;
/** Containing function. */
@Reference
private final FunctionNode functionNode;
/** A list of target labels in parent methods this split node may encounter. */
@Ignore
private final List<Label> externalTargets;
/** True if this split node or any of its children contain a return statement. */
private boolean hasReturn;
/** Body of split code. */
@Ignore
private Node body;
/**
* Constructor
*
* @param name name of split node
* @param functionNode function node to split in
* @param body body of split code
*/
public SplitNode(final String name, final FunctionNode functionNode, final Node body) {
super(body.getSource(), body.getToken(), body.getFinish());
this.name = name;
this.functionNode = functionNode;
this.body = body;
this.externalTargets = new ArrayList<>();
}
private SplitNode(final SplitNode splitNode, final CopyState cs) {
super(splitNode);
this.name = splitNode.name;
this.functionNode = (FunctionNode)cs.existingOrSame(splitNode.functionNode);
this.body = cs.existingOrCopy(splitNode.body);
this.externalTargets = new ArrayList<>();
}
@Override
protected Node copy(final CopyState cs) {
return new SplitNode(this, cs);
}
@Override
public Node accept(final NodeVisitor visitor) {
final CompileUnit saveCompileUnit = visitor.getCurrentCompileUnit();
final MethodEmitter saveMethod = visitor.getCurrentMethodEmitter();
setCaller(saveMethod);
visitor.setCurrentCompileUnit(getCompileUnit());
visitor.setCurrentMethodEmitter(getMethodEmitter());
try {
if (visitor.enterSplitNode(this) != null) {
body = body.accept(visitor);
return visitor.leaveSplitNode(this);
}
} finally {
visitor.setCurrentCompileUnit(saveCompileUnit);
visitor.setCurrentMethodEmitter(saveMethod);
}
return this;
}
@Override
public void toString(final StringBuilder sb) {
sb.append("<split>(");
sb.append(compileUnit.getClass().getSimpleName());
sb.append(") ");
body.toString(sb);
}
/**
* Get the method emitter of the caller for this split node
* @return caller method emitter
*/
public MethodEmitter getCaller() {
return caller;
}
/**
* Set the caller method emitter for this split node
* @param caller method emitter
*/
public void setCaller(final MethodEmitter caller) {
this.caller = caller;
}
/**
* Get the name for this split node
* @return name
*/
public String getName() {
return name;
}
/**
* Get the compile unit for this split node
* @return compile unit
*/
public CompileUnit getCompileUnit() {
return compileUnit;
}
/**
* Set the compile unit for this split node
* @param compileUnit compile unit
*/
public void setCompileUnit(final CompileUnit compileUnit) {
this.compileUnit = compileUnit;
}
/**
* Get the method emitter for this split node
* @return method emitter
*/
public MethodEmitter getMethodEmitter() {
return method;
}
/**
* Set the method emitter for this split node
* @param method method emitter
*/
public void setMethodEmitter(final MethodEmitter method) {
this.method = method;
}
/**
* Get the function node this SplitNode splits
* @return function node reference
*/
public FunctionNode getFunctionNode() {
return functionNode;
}
/**
* Get the external targets for this SplitNode
* @return list of external targets
*/
public List<Label> getExternalTargets() {
return Collections.unmodifiableList(externalTargets);
}
/**
* Add an external target for this SplitNode
* @param targetLabel target label
*/
public void addExternalTarget(final Label targetLabel) {
externalTargets.add(targetLabel);
}
/**
* Check whether this SplitNode returns a value
* @return true if return
*/
public boolean hasReturn() {
return hasReturn;
}
/**
* Set whether this SplitNode returns a value or not
* @param hasReturn true if return exists, false otherwise
*/
public void setHasReturn(final boolean hasReturn) {
this.hasReturn = hasReturn;
}
}
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