001/*
002 * Copyright (c) 2013, 2014, Oracle and/or its affiliates. All rights reserved.
003 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
004 *
005 * This code is free software; you can redistribute it and/or modify it
006 * under the terms of the GNU General Public License version 2 only, as
007 * published by the Free Software Foundation.
008 *
009 * This code is distributed in the hope that it will be useful, but WITHOUT
010 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
011 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
012 * version 2 for more details (a copy is included in the LICENSE file that
013 * accompanied this code).
014 *
015 * You should have received a copy of the GNU General Public License version
016 * 2 along with this work; if not, write to the Free Software Foundation,
017 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
018 *
019 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
020 * or visit www.oracle.com if you need additional information or have any
021 * questions.
022 */
023package com.oracle.graal.lir.sparc;
024
025import com.oracle.graal.asm.sparc.*;
026import com.oracle.graal.lir.*;
027import com.oracle.graal.lir.asm.*;
028
029/**
030 * This interface is used for {@link LIRInstruction}s which provide a delay slot for one instruction
031 * from another {@link LIRInstruction}.
032 *
033 * @see SPARCTailDelayedLIRInstruction
034 */
035public interface SPARCDelayedControlTransfer {
036
037    SPARCDelayedControlTransfer DUMMY = new SPARCDelayedControlTransfer() {
038        public void emitControlTransfer(CompilationResultBuilder crb, SPARCMacroAssembler masm) {
039            // do nothing
040        }
041
042        @Override
043        public String toString() {
044            return "null";
045        }
046
047        public void resetState() {
048        }
049    };
050
051    /**
052     * This method must be called, to generate the control transfer, but without any Nop in the
053     * delay slot.
054     *
055     * @param crb
056     * @param masm
057     */
058    void emitControlTransfer(CompilationResultBuilder crb, SPARCMacroAssembler masm);
059
060    void resetState();
061}