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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.runtime.arrays.ArrayIndex.getArrayIndex;
import static jdk.nashorn.internal.runtime.arrays.ArrayIndex.isValidArrayIndex;
import java.util.ArrayList;
import java.util.List;
import jdk.nashorn.internal.ir.Symbol;
import jdk.nashorn.internal.runtime.AccessorProperty;
import jdk.nashorn.internal.runtime.Property;
import jdk.nashorn.internal.runtime.PropertyMap;
/**
* Class that creates PropertyMap sent to script object constructors.
*/
public class MapCreator {
/** Object structure for objects associated with this map */
private final Class<?> structure;
/** key set for object map */
final List<String> keys;
/** corresponding symbol set for object map */
final List<Symbol> symbols;
/**
* Constructor
*
* @param structure structure to generate map for (a JO subclass)
* @param keys list of keys for map
* @param symbols list of symbols for map
*/
MapCreator(final Class<?> structure, final List<String> keys, final List<Symbol> symbols) {
this.structure = structure;
this.keys = keys;
this.symbols = symbols;
}
/**
* Constructs a property map based on a set of fields.
*
* @param hasArguments does the created object have an "arguments" property
* @param fieldCount Number of fields in use.
* @param fieldMaximum Number of fields available.
*
* @return New map populated with accessor properties.
*/
PropertyMap makeFieldMap(final boolean hasArguments, final int fieldCount, final int fieldMaximum) {
final List<Property> properties = new ArrayList<>();
assert keys != null;
for (int i = 0, length = keys.size(); i < length; i++) {
final String key = keys.get(i);
final Symbol symbol = symbols.get(i);
if (symbol != null && !isValidArrayIndex(getArrayIndex(key))) {
properties.add(new AccessorProperty(key, getPropertyFlags(symbol, hasArguments), structure, symbol.getFieldIndex()));
}
}
return PropertyMap.newMap(properties, fieldCount, fieldMaximum, 0);
}
PropertyMap makeSpillMap(final boolean hasArguments) {
final List<Property> properties = new ArrayList<>();
int spillIndex = 0;
assert keys != null;
for (int i = 0, length = keys.size(); i < length; i++) {
final String key = keys.get(i);
final Symbol symbol = symbols.get(i);
if (symbol != null && !isValidArrayIndex(getArrayIndex(key))) {
properties.add(new AccessorProperty(key, getPropertyFlags(symbol, hasArguments), spillIndex++));
}
}
return PropertyMap.newMap(properties, 0, 0, spillIndex);
}
/**
* Compute property flags given local state of a field. May be overridden and extended,
*
* @param symbol symbol to check
* @param hasArguments does the created object have an "arguments" property
*
* @return flags to use for fields
*/
protected int getPropertyFlags(final Symbol symbol, final boolean hasArguments) {
int flags = 0;
if (symbol.isParam()) {
flags |= Property.IS_ALWAYS_OBJECT | Property.IS_PARAMETER;
}
if (hasArguments) {
flags |= Property.IS_ALWAYS_OBJECT | Property.HAS_ARGUMENTS;
}
if (symbol.isScope()) {
flags |= Property.NOT_CONFIGURABLE;
}
if (symbol.canBePrimitive()) {
flags |= Property.CAN_BE_PRIMITIVE;
}
if (symbol.canBeUndefined()) {
flags |= Property.CAN_BE_UNDEFINED;
}
return flags;
}
}
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