/*
* 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.tools.nasgen;
import static jdk.internal.org.objectweb.asm.Opcodes.ACC_FINAL;
import static jdk.internal.org.objectweb.asm.Opcodes.ACC_PUBLIC;
import static jdk.internal.org.objectweb.asm.Opcodes.ACC_SUPER;
import static jdk.internal.org.objectweb.asm.Opcodes.V1_7;
import static jdk.nashorn.internal.tools.nasgen.StringConstants.DEFAULT_INIT_DESC;
import static jdk.nashorn.internal.tools.nasgen.StringConstants.INIT;
import static jdk.nashorn.internal.tools.nasgen.StringConstants.OBJECT_DESC;
import static jdk.nashorn.internal.tools.nasgen.StringConstants.PROPERTYMAP_DESC;
import static jdk.nashorn.internal.tools.nasgen.StringConstants.PROPERTYMAP_FIELD_NAME;
import static jdk.nashorn.internal.tools.nasgen.StringConstants.PROTOTYPEOBJECT_TYPE;
import static jdk.nashorn.internal.tools.nasgen.StringConstants.PROTOTYPE_SUFFIX;
import static jdk.nashorn.internal.tools.nasgen.StringConstants.SCRIPTOBJECT_INIT_DESC;
import java.io.FileOutputStream;
import java.io.IOException;
/**
* This class generates prototype class for a @ScriptClass annotated class.
*
*/
public class PrototypeGenerator extends ClassGenerator {
private final ScriptClassInfo scriptClassInfo;
private final String className;
private final int memberCount;
PrototypeGenerator(final ScriptClassInfo sci) {
this.scriptClassInfo = sci;
this.className = scriptClassInfo.getPrototypeClassName();
this.memberCount = scriptClassInfo.getPrototypeMemberCount();
}
byte[] getClassBytes() {
// new class extending from ScriptObject
cw.visit(V1_7, ACC_FINAL | ACC_SUPER, className, null, PROTOTYPEOBJECT_TYPE, null);
if (memberCount > 0) {
// add fields
emitFields();
// add <clinit>
emitStaticInitializer();
}
// add <init>
emitConstructor();
// add getClassName()
emitGetClassName(scriptClassInfo.getName());
cw.visitEnd();
return cw.toByteArray();
}
// --Internals only below this point
private void emitFields() {
// introduce "Function" type instance fields for each
// prototype @Function in script class info
for (MemberInfo memInfo : scriptClassInfo.getMembers()) {
if (memInfo.isPrototypeFunction()) {
addFunctionField(memInfo.getJavaName());
memInfo = (MemberInfo)memInfo.clone();
memInfo.setJavaDesc(OBJECT_DESC);
addGetter(className, memInfo);
addSetter(className, memInfo);
} else if (memInfo.isPrototypeProperty()) {
if (memInfo.isStaticFinal()) {
addGetter(scriptClassInfo.getJavaName(), memInfo);
} else {
addField(memInfo.getJavaName(), memInfo.getJavaDesc());
memInfo = (MemberInfo)memInfo.clone();
memInfo.setJavaAccess(ACC_PUBLIC);
addGetter(className, memInfo);
addSetter(className, memInfo);
}
}
}
addMapField();
}
private void emitStaticInitializer() {
final MethodGenerator mi = makeStaticInitializer();
emitStaticInitPrefix(mi, className, memberCount);
for (final MemberInfo memInfo : scriptClassInfo.getMembers()) {
if (memInfo.isPrototypeFunction() || memInfo.isPrototypeProperty()) {
linkerAddGetterSetter(mi, className, memInfo);
} else if (memInfo.isPrototypeGetter()) {
final MemberInfo setter = scriptClassInfo.findSetter(memInfo);
linkerAddGetterSetter(mi, scriptClassInfo.getJavaName(), memInfo, setter);
}
}
emitStaticInitSuffix(mi, className);
}
private void emitConstructor() {
final MethodGenerator mi = makeConstructor();
mi.visitCode();
mi.loadThis();
if (memberCount > 0) {
// call "super(map$)"
mi.getStatic(className, PROPERTYMAP_FIELD_NAME, PROPERTYMAP_DESC);
mi.invokeSpecial(PROTOTYPEOBJECT_TYPE, INIT, SCRIPTOBJECT_INIT_DESC);
// initialize Function type fields
initFunctionFields(mi);
} else {
// call "super()"
mi.invokeSpecial(PROTOTYPEOBJECT_TYPE, INIT, DEFAULT_INIT_DESC);
}
mi.returnVoid();
mi.computeMaxs();
mi.visitEnd();
}
private void initFunctionFields(final MethodGenerator mi) {
for (final MemberInfo memInfo : scriptClassInfo.getMembers()) {
if (! memInfo.isPrototypeFunction()) {
continue;
}
mi.loadThis();
newFunction(mi, scriptClassInfo.getName(), scriptClassInfo.getJavaName(), memInfo, scriptClassInfo.findSpecializations(memInfo.getJavaName()));
mi.putField(className, memInfo.getJavaName(), OBJECT_DESC);
}
}
/**
* External entry point for PrototypeGenerator if called from the command line
*
* @param args arguments, takes 1 argument which is the class to process
* @throws IOException if class cannot be read
*/
public static void main(final String[] args) throws IOException {
if (args.length != 1) {
System.err.println("Usage: " + PrototypeGenerator.class.getName() + " <class>");
System.exit(1);
}
final String className = args[0].replace('.', '/');
final ScriptClassInfo sci = getScriptClassInfo(className + ".class");
if (sci == null) {
System.err.println("No @ScriptClass in " + className);
System.exit(2);
throw new AssertionError(); //guard against warning that sci is null below
}
try {
sci.verify();
} catch (final Exception e) {
System.err.println(e.getMessage());
System.exit(3);
}
final PrototypeGenerator gen = new PrototypeGenerator(sci);
try (FileOutputStream fos = new FileOutputStream(className + PROTOTYPE_SUFFIX + ".class")) {
fos.write(gen.getClassBytes());
}
}
}