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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.constructorNoLookup;
import static jdk.nashorn.internal.codegen.CompilerConstants.virtualCallNoLookup;
import static jdk.nashorn.internal.codegen.types.Type.OBJECT;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Set;
import jdk.nashorn.internal.codegen.types.Type;
import jdk.nashorn.internal.ir.Expression;
import jdk.nashorn.internal.ir.LiteralNode;
import jdk.nashorn.internal.ir.Symbol;
import jdk.nashorn.internal.runtime.Property;
import jdk.nashorn.internal.runtime.PropertyMap;
import jdk.nashorn.internal.runtime.ScriptObject;
import jdk.nashorn.internal.runtime.arrays.ArrayData;
import jdk.nashorn.internal.runtime.arrays.ArrayIndex;
import jdk.nashorn.internal.scripts.JO;
/**
* An object creator that uses spill properties.
*/
public class SpillObjectCreator extends ObjectCreator {
private final List<Expression> values;
/**
* Constructor
*
* @param codegen code generator
* @param keys keys for fields in object
* @param symbols symbols for fields in object
* @param values list of values corresponding to keys
*/
protected SpillObjectCreator(final CodeGenerator codegen, final List<String> keys, final List<Symbol> symbols, final List<Expression> values) {
super(codegen, keys, symbols, false, false);
this.values = values;
makeMap();
}
@Override
protected void makeObject(final MethodEmitter method) {
assert !isScope() : "spill scope objects are not currently supported";
final int length = keys.size();
final Object[] presetValues = new Object[length];
final Set<Integer> postsetValues = new LinkedHashSet<>();
final int callSiteFlags = codegen.getCallSiteFlags();
ArrayData arrayData = ArrayData.allocate(new Object[0]);
// Compute constant property values
for (int i = 0; i < length; i++) {
final String key = keys.get(i);
final Expression value = values.get(i);
if (value == null) {
continue; // getter or setter
}
final Object constantValue = LiteralNode.objectAsConstant(value);
if (constantValue == LiteralNode.POSTSET_MARKER) {
postsetValues.add(i);
continue;
}
final Property property = propertyMap.findProperty(key);
if (property != null) {
// normal property key
presetValues[property.getSlot()] = constantValue;
} else {
// array index key
final long oldLength = arrayData.length();
final int index = ArrayIndex.getArrayIndex(key);
assert ArrayIndex.isValidArrayIndex(index);
final long longIndex = ArrayIndex.toLongIndex(index);
if (longIndex >= oldLength) {
arrayData = arrayData.ensure(longIndex);
}
arrayData = arrayData.set(index, constantValue, false);
if (longIndex > oldLength) {
arrayData = arrayData.delete(oldLength, longIndex - 1);
}
}
}
// create object and invoke constructor
method._new(JO.class).dup();
codegen.loadConstant(propertyMap);
method.invoke(constructorNoLookup(JO.class, PropertyMap.class));
// Set spill array with preset values
method.dup();
codegen.loadConstant(presetValues);
method.putField(Type.getInternalName(ScriptObject.class), "spill", Type.OBJECT_ARRAY.getDescriptor());
// Set array data if any
if (arrayData.length() > 0) {
method.dup();
codegen.loadConstant(arrayData);
method.invoke(virtualCallNoLookup(ScriptObject.class, "setArray",void.class, ArrayData.class));
}
// Create properties with non-constant values
for (int i : postsetValues) {
final String key = keys.get(i);
final Property property = propertyMap.findProperty(key);
if (property == null) {
final int index = ArrayIndex.getArrayIndex(key);
assert ArrayIndex.isValidArrayIndex(index);
method.dup();
method.load(ArrayIndex.toLongIndex(index));
codegen.load(values.get(i));
method.dynamicSetIndex(callSiteFlags);
} else {
method.dup();
method.getField(Type.getInternalName(ScriptObject.class), "spill", Type.OBJECT_ARRAY.getDescriptor());
method.load(property.getSlot());
codegen.load(values.get(i), OBJECT);
method.arraystore();
}
}
}
@Override
protected PropertyMap makeMap() {
assert propertyMap == null : "property map already initialized";
propertyMap = new MapCreator(JO.class, keys, symbols) {
@Override
protected int getPropertyFlags(Symbol symbol, boolean hasArguments) {
return super.getPropertyFlags(symbol, hasArguments) | Property.IS_SPILL | Property.IS_ALWAYS_OBJECT;
}
}.makeSpillMap(false);
return propertyMap;
}
}
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