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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.runtime;
import static jdk.nashorn.internal.lookup.Lookup.MH;
import java.lang.invoke.MethodHandle;
/**
* This is a subclass that represents a script function that may not be regenerated.
* This is used for example for bound functions and builtins.
*/
final class FinalScriptFunctionData extends ScriptFunctionData {
/**
* Constructor - used for bind
*
* @param name name
* @param arity arity
* @param functions precompiled code
* @param flags {@link ScriptFunctionData} flags
*/
FinalScriptFunctionData(final String name, final int arity, final CompiledFunctions functions, final int flags) {
super(name, arity, flags);
code.addAll(functions);
}
/**
* Constructor - used from ScriptFunction. This assumes that we have code already for the
* method (typically a native method) and possibly specializations.
*
* @param name name
* @param mh method handle for generic version of method
* @param specs specializations
* @param flags {@link ScriptFunctionData} flags
*/
FinalScriptFunctionData(final String name, final MethodHandle mh, final MethodHandle[] specs, final int flags) {
super(name, arity(mh), flags);
addInvoker(mh);
if (specs != null) {
for (final MethodHandle spec : specs) {
addInvoker(spec);
}
}
}
private void addInvoker(final MethodHandle mh) {
if (isConstructor(mh)) {
// only nasgen constructors: (boolean, self, args) are subject to binding a boolean newObj. isConstructor
// is too conservative a check. However, isConstructor(mh) always implies isConstructor param
assert isConstructor();
final MethodHandle invoker = MH.insertArguments(mh, 0, false);
final MethodHandle constructor = composeConstructor(MH.insertArguments(mh, 0, true));
code.add(new CompiledFunction(mh.type(), invoker, constructor));
} else {
code.add(new CompiledFunction(mh.type(), mh));
}
}
private static int arity(final MethodHandle mh) {
if (isVarArg(mh)) {
return -1;
}
//drop self, callee and boolean constructor flag to get real arity
return mh.type().parameterCount() - 1 - (needsCallee(mh) ? 1 : 0) - (isConstructor(mh) ? 1 : 0);
}
private static boolean isConstructor(final MethodHandle mh) {
return mh.type().parameterCount() >= 1 && mh.type().parameterType(0) == boolean.class;
}
}
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