/*
 * Copyright (c) 2012, 2014, 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.
 *
 * 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 com.oracle.truffle.sl.builtins;

import com.oracle.truffle.api.CompilerDirectives.TruffleBoundary;
import com.oracle.truffle.api.*;
import com.oracle.truffle.api.dsl.*;
import com.oracle.truffle.api.frame.*;
import com.oracle.truffle.api.frame.FrameInstance.FrameAccess;
import com.oracle.truffle.api.nodes.*;
import com.oracle.truffle.api.source.*;

/**
 * This builtin sets the variable named "hello" in the caller frame to the string "world".
 */
@NodeInfo(shortName = "helloEqualsWorld")
public abstract class SLHelloEqualsWorldBuiltin extends SLBuiltinNode {

    public SLHelloEqualsWorldBuiltin() {
        super(new NullSourceSection("SL builtin", "helloEqualsWorld"));
    }

    @Specialization
    @TruffleBoundary
    public String change() {
        FrameInstance frameInstance = Truffle.getRuntime().getCallerFrame();
        Frame frame = frameInstance.getFrame(FrameAccess.READ_WRITE, false);
        FrameSlot slot = frame.getFrameDescriptor().findOrAddFrameSlot("hello");
        frame.setObject(slot, "world");
        return "world";
    }
}