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.*;
027
028/**
029 * Implementors of this interface are able to place its last instruction into the delay slot of a
030 * {@link SPARCDelayedControlTransfer} instruction.
031 *
032 * The implementor has to do following steps to emit code into the delay slot for the
033 * DelayedControlTransfer instruction:
034 * <ol>
035 * <li>Emit everything up to the second last instruction.</li>
036 * <li>Call
037 * {@link SPARCDelayedControlTransfer#emitControlTransfer(com.oracle.graal.lir.asm.CompilationResultBuilder, SPARCMacroAssembler)}
038 * to let the DelayedControlTransfer instruction emit its own code (But must not stuff the delay
039 * slot with Nop)</li>
040 * <li>emit the last instruction for this {@link LIRInstruction}</li>
041 * </ol>
042 *
043 * Note: If this instruction decides not to use the delay slot, it can skip the call of
044 * {@link SPARCDelayedControlTransfer#emitControlTransfer(com.oracle.graal.lir.asm.CompilationResultBuilder, SPARCMacroAssembler)}
045 * . The DelayedControlTransfer instruction will emit the code just with Nop in the delay slot.
046 */
047public interface SPARCTailDelayedLIRInstruction {
048    void setDelayedControlTransfer(SPARCDelayedControlTransfer holder);
049}