| /* |
| * 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.codegen.CompilerConstants.staticCallNoLookup; |
| |
| import jdk.nashorn.internal.codegen.CompilerConstants.Call; |
| |
| /** |
| * A class with static helper methods invoked from generated bytecode for setting values of parameters of variable-arity |
| * functions. |
| */ |
| public final class ArgumentSetter { |
| private ArgumentSetter() {} |
| |
| /** Method handle for setting a function argument at a given index in an arguments object. Used from generated bytecode */ |
| public static final Call SET_ARGUMENT = staticCallNoLookup(ArgumentSetter.class, "setArgument", void.class, Object.class, ScriptObject.class, int.class); |
| |
| /** Method handle for setting a function argument at a given index in an arguments array. Used from generated bytecode */ |
| public static final Call SET_ARRAY_ELEMENT = staticCallNoLookup(ArgumentSetter.class, "setArrayElement", void.class, Object.class, Object[].class, int.class); |
| |
| |
| /** |
| * Used from generated bytecode to invoke {@link ScriptObject#setArgument(int, Object)} without having to reorder |
| * the arguments on the stack. When we're generating a store into the argument, we first have the value on the |
| * stack, and only afterwards load the target object and the index. |
| * @param value the value to write at the given argument index. |
| * @param arguments the arguments object that we're writing the value to |
| * @param key the index of the argument |
| */ |
| public static void setArgument(final Object value, final ScriptObject arguments, final int key) { |
| arguments.setArgument(key, value); |
| } |
| |
| /** |
| * Used from generated bytecode to set a variable arity parameter - an array element - without having to reorder |
| * the arguments on the stack. When we're generating a store into the array, we first have the value on the |
| * stack, and only afterwards load the target array and the index. |
| * @param value the value to write at the given argument index. |
| * @param arguments the arguments array that we're writing the value to |
| * @param key the index of the argument |
| */ |
| public static void setArrayElement(final Object value, final Object[] arguments, final int key) { |
| arguments[key] = value; |
| } |
| } |