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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 java.util.List;
import static jdk.nashorn.internal.codegen.ObjectClassGenerator.FIELD_PADDING;
import jdk.nashorn.internal.ir.Symbol;
import jdk.nashorn.internal.runtime.Context;
import jdk.nashorn.internal.runtime.PropertyMap;
/**
* Base class for object creation code generation.
*/
public abstract class ObjectCreator {
/** Compile unit for this ObjectCreator, see CompileUnit */
//protected final CompileUnit compileUnit;
/** List of keys to initiate in this ObjectCreator */
protected final List<String> keys;
/** List of symbols to initiate in this ObjectCreator */
protected final List<Symbol> symbols;
/** Code generator */
protected final CodeGenerator codegen;
private final boolean isScope;
private final boolean hasArguments;
private int fieldCount;
private int paddedFieldCount;
private int paramCount;
private String fieldObjectClassName;
private Class<?> fieldObjectClass;
private PropertyMap propertyMap;
/**
* Constructor
*
* @param codegen the code generator
* @param keys the keys
* @param symbols the symbols corresponding to keys, same index
* @param isScope is this object scope
* @param hasArguments does the created object have an "arguments" property
*/
protected ObjectCreator(final CodeGenerator codegen, final List<String> keys, final List<Symbol> symbols, final boolean isScope, final boolean hasArguments) {
this.codegen = codegen;
this.keys = keys;
this.symbols = symbols;
this.isScope = isScope;
this.hasArguments = hasArguments;
countFields();
findClass();
}
/**
* Tally the number of fields and parameters.
*/
private void countFields() {
for (final Symbol symbol : this.symbols) {
if (symbol != null) {
if (hasArguments() && symbol.isParam()) {
symbol.setFieldIndex(paramCount++);
} else {
symbol.setFieldIndex(fieldCount++);
}
}
}
paddedFieldCount = fieldCount + FIELD_PADDING;
}
/**
* Locate (or indirectly create) the object container class.
*/
private void findClass() {
fieldObjectClassName = isScope() ?
ObjectClassGenerator.getClassName(fieldCount, paramCount) :
ObjectClassGenerator.getClassName(paddedFieldCount);
try {
this.fieldObjectClass = Context.forStructureClass(Compiler.binaryName(fieldObjectClassName));
} catch (final ClassNotFoundException e) {
throw new AssertionError("Nashorn has encountered an internal error. Structure can not be created.");
}
}
/**
* Generate code for making the object.
* @param method Script method.
*/
protected abstract void makeObject(final MethodEmitter method);
/**
* Create a new MapCreator
* @param clazz type of MapCreator
* @return map creator instantiated by type
*/
protected MapCreator newMapCreator(final Class<?> clazz) {
return new MapCreator(clazz, keys, symbols);
}
/**
* Construct the property map appropriate for the object.
* @return the newly created property map
*/
protected PropertyMap makeMap() {
propertyMap = newMapCreator(fieldObjectClass).makeMap(hasArguments(), fieldCount, paddedFieldCount);
return propertyMap;
}
/**
* 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;
}
/**
* Get the class name for the object class,
* e.g. {@code com.nashorn.oracle.scripts.JO2P0}
*
* @return script class name
*/
String getClassName() {
return fieldObjectClassName;
}
/**
* 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;
}
}
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