1 /* 2 * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 package jdk.nashorn.internal.runtime; 27 28 import static jdk.nashorn.internal.lookup.Lookup.MH; 29 30 import java.lang.invoke.MethodHandle; 31 32 /** 33 * This is a subclass that represents a script function that may not be regenerated. 34 * This is used for example for bound functions and builtins. 35 */ 36 final class FinalScriptFunctionData extends ScriptFunctionData { 37 38 /** 39 * Constructor - used for bind 40 * 41 * @param name name 42 * @param arity arity 43 * @param functions precompiled code 44 * @param flags {@link ScriptFunctionData} flags 45 */ 46 FinalScriptFunctionData(final String name, final int arity, final CompiledFunctions functions, final int flags) { 47 super(name, arity, flags); 48 code.addAll(functions); 49 } 50 51 /** 52 * Constructor - used from ScriptFunction. This assumes that we have code already for the 53 * method (typically a native method) and possibly specializations. 54 * 55 * @param name name 56 * @param mh method handle for generic version of method 57 * @param specs specializations 58 * @param flags {@link ScriptFunctionData} flags 59 */ 60 FinalScriptFunctionData(final String name, final MethodHandle mh, final MethodHandle[] specs, final int flags) { 61 super(name, arity(mh), flags); 62 63 addInvoker(mh); 64 if (specs != null) { 65 for (final MethodHandle spec : specs) { 66 addInvoker(spec); 67 } 68 } 69 } 70 71 private void addInvoker(final MethodHandle mh) { 72 if (isConstructor(mh)) { 73 // only nasgen constructors: (boolean, self, args) are subject to binding a boolean newObj. isConstructor 74 // is too conservative a check. However, isConstructor(mh) always implies isConstructor param 75 assert isConstructor(); 76 final MethodHandle invoker = MH.insertArguments(mh, 0, false); 77 final MethodHandle constructor = composeConstructor(MH.insertArguments(mh, 0, true)); 78 code.add(new CompiledFunction(mh.type(), invoker, constructor)); 79 } else { 80 code.add(new CompiledFunction(mh.type(), mh)); 81 } 82 } 83 84 private static int arity(final MethodHandle mh) { 85 if (isVarArg(mh)) { 86 return -1; 87 } 88 89 //drop self, callee and boolean constructor flag to get real arity 90 return mh.type().parameterCount() - 1 - (needsCallee(mh) ? 1 : 0) - (isConstructor(mh) ? 1 : 0); 91 } 92 93 private static boolean isConstructor(final MethodHandle mh) { 94 return mh.type().parameterCount() >= 1 && mh.type().parameterType(0) == boolean.class; 95 } 96 97 } --- EOF ---