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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.ARGUMENTS;
import static jdk.nashorn.internal.codegen.CompilerConstants.constructorNoLookup;
import static jdk.nashorn.internal.codegen.CompilerConstants.typeDescriptor;
import static jdk.nashorn.internal.codegen.ObjectClassGenerator.getPaddedFieldCount;
import static jdk.nashorn.internal.codegen.types.Type.OBJECT;
import java.util.Iterator;
import java.util.List;
import jdk.nashorn.internal.codegen.types.Type;
import jdk.nashorn.internal.ir.Symbol;
import jdk.nashorn.internal.runtime.Context;
import jdk.nashorn.internal.runtime.PropertyMap;
import jdk.nashorn.internal.runtime.ScriptObject;
import jdk.nashorn.internal.runtime.arrays.ArrayIndex;
/**
* Analyze an object's characteristics for appropriate code generation. This
* is used for functions and for objects. A field object take a set of values which
* to assign to the various fields in the object. This is done by the generated code
*
* @param <T> the value type for the fields being written on object creation, e.g. Node
* @see jdk.nashorn.internal.ir.Node
*/
public abstract class FieldObjectCreator<T> extends ObjectCreator {
private String fieldObjectClassName;
private Class<?> fieldObjectClass;
private int fieldCount;
private int paddedFieldCount;
private int paramCount;
/** array of corresponding values to symbols (null for no values) */
private final List<T> values;
/** call site flags to be used for invocations */
private final int callSiteFlags;
/**
* 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
*/
FieldObjectCreator(final CodeGenerator codegen, final List<String> keys, final List<Symbol> symbols, final List<T> values) {
this(codegen, keys, symbols, values, false, false);
}
/**
* Constructor
*
* @param codegen code generator
* @param keys keys for fields in object
* @param symbols symbols for fields in object
* @param values values (or null where no value) to be written to the fields
* @param isScope is this a scope object
* @param hasArguments does the created object have an "arguments" property
*/
FieldObjectCreator(final CodeGenerator codegen, final List<String> keys, final List<Symbol> symbols, final List<T> values, final boolean isScope, final boolean hasArguments) {
super(codegen, keys, symbols, isScope, hasArguments);
this.values = values;
this.callSiteFlags = codegen.getCallSiteFlags();
countFields();
findClass();
}
/**
* Construct an object.
*
* @param method the method emitter
*/
@Override
protected void makeObject(final MethodEmitter method) {
makeMap();
method._new(getClassName()).dup(); // create instance
loadMap(method); //load the map
if (isScope()) {
loadScope(method);
if (hasArguments()) {
method.loadCompilerConstant(ARGUMENTS);
method.invoke(constructorNoLookup(getClassName(), PropertyMap.class, ScriptObject.class, ARGUMENTS.type()));
} else {
method.invoke(constructorNoLookup(getClassName(), PropertyMap.class, ScriptObject.class));
}
} else {
method.invoke(constructorNoLookup(getClassName(), PropertyMap.class));
}
// Set values.
final Iterator<Symbol> symbolIter = symbols.iterator();
final Iterator<String> keyIter = keys.iterator();
final Iterator<T> valueIter = values.iterator();
while (symbolIter.hasNext()) {
final Symbol symbol = symbolIter.next();
final String key = keyIter.next();
final T value = valueIter.next();
if (symbol != null && value != null) {
final int index = ArrayIndex.getArrayIndex(key);
if (index < 0) {
putField(method, key, symbol.getFieldIndex(), value);
} else {
putSlot(method, index, value);
}
}
}
}
@Override
protected PropertyMap makeMap() {
assert propertyMap == null : "property map already initialized";
propertyMap = newMapCreator(fieldObjectClass).makeFieldMap(hasArguments(), fieldCount, paddedFieldCount);
return propertyMap;
}
/**
* Technique for loading an initial value. Defined by anonymous subclasses in code gen.
*
* @param value Value to load.
*/
protected abstract void loadValue(T value);
/**
* Store a value in a field of the generated class object.
*
* @param method Script method.
* @param key Property key.
* @param fieldIndex Field number.
* @param value Value to store.
*/
private void putField(final MethodEmitter method, final String key, final int fieldIndex, final T value) {
method.dup();
loadValue(value);
method.convert(OBJECT);
method.putField(getClassName(), ObjectClassGenerator.getFieldName(fieldIndex, Type.OBJECT), typeDescriptor(Object.class));
}
/**
* Store a value in an indexed slot of a generated class object.
*
* @param method Script method.
* @param index Slot index.
* @param value Value to store.
*/
private void putSlot(final MethodEmitter method, final int index, final T value) {
method.dup();
method.load(index);
loadValue(value);
method.dynamicSetIndex(callSiteFlags);
}
/**
* 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.");
}
}
/**
* Get the class name for the object class,
* e.g. {@code com.nashorn.oracle.scripts.JO2P0}
*
* @return script class name
*/
String getClassName() {
return fieldObjectClassName;
}
/**
* 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 = getPaddedFieldCount(fieldCount);
}
}
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