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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.codegen;
import static jdk.nashorn.internal.codegen.CompilerConstants.SCOPE;
import java.util.List;
import jdk.nashorn.internal.codegen.types.Type;
import jdk.nashorn.internal.runtime.PropertyMap;
import jdk.nashorn.internal.runtime.ScriptObject;
/**
* Base class for object creation code generation.
* @param <T> value type
*/
public abstract class ObjectCreator<T> {
/** List of keys & symbols to initiate in this ObjectCreator */
final List<MapTuple<T>> tuples;
/** Code generator */
final CodeGenerator codegen;
/** Property map */
protected PropertyMap propertyMap;
private final boolean isScope;
private final boolean hasArguments;
/**
* Constructor
*
* @param codegen the code generator
* @param tuples key,symbol,value (optional) tuples
* @param isScope is this object scope
* @param hasArguments does the created object have an "arguments" property
*/
ObjectCreator(final CodeGenerator codegen, final List<MapTuple<T>> tuples, final boolean isScope, final boolean hasArguments) {
this.codegen = codegen;
this.tuples = tuples;
this.isScope = isScope;
this.hasArguments = hasArguments;
}
/**
* Generate code for making the object.
* @param method Script method.
*/
protected abstract void makeObject(final MethodEmitter method);
/**
* Construct the property map appropriate for the object.
* @return the newly created property map
*/
protected abstract PropertyMap makeMap();
/**
* Create a new MapCreator
* @param clazz type of MapCreator
* @return map creator instantiated by type
*/
protected MapCreator<?> newMapCreator(final Class<? extends ScriptObject> clazz) {
return new MapCreator<>(clazz, tuples);
}
/**
* Loads the scope on the stack through the passed method emitter.
* @param method the method emitter to use
*/
protected void loadScope(final MethodEmitter method) {
method.loadCompilerConstant(SCOPE);
}
/**
* Emit the correct map for the object.
* @param method method emitter
* @return the method emitter
*/
protected MethodEmitter loadMap(final MethodEmitter method) {
codegen.loadConstant(propertyMap);
return method;
}
PropertyMap getMap() {
return propertyMap;
}
/**
* Is this a scope object
* @return true if scope
*/
protected boolean isScope() {
return isScope;
}
/**
* Does the created object have an "arguments" property
* @return true if has an "arguments" property
*/
protected boolean hasArguments() {
return hasArguments;
}
/**
* Technique for loading an initial value. Defined by anonymous subclasses in code gen.
*
* @param value Value to load.
* @param type the type of the value to load
*/
protected abstract void loadValue(T value, Type type);
MethodEmitter loadTuple(final MethodEmitter method, final MapTuple<T> tuple, final boolean pack) {
loadValue(tuple.value, tuple.type);
if (pack && tuple.isPrimitive()) {
method.pack();
} else {
method.convert(Type.OBJECT);
}
return method;
}
MethodEmitter loadTuple(final MethodEmitter method, final MapTuple<T> tuple) {
return loadTuple(method, tuple, true);
}
}
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