001/*
002 * Copyright (c) 2013, 2015, 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 static com.oracle.graal.asm.sparc.SPARCAssembler.Annul.*;
026
027import com.oracle.graal.asm.sparc.*;
028import com.oracle.graal.asm.sparc.SPARCAssembler.*;
029import com.oracle.graal.lir.*;
030import com.oracle.graal.lir.StandardOp.JumpOp;
031import com.oracle.graal.lir.asm.*;
032import com.oracle.graal.lir.sparc.SPARCLIRInstruction.*;
033
034public final class SPARCJumpOp extends JumpOp implements SPARCDelayedControlTransfer {
035    public static final LIRInstructionClass<SPARCJumpOp> TYPE = LIRInstructionClass.create(SPARCJumpOp.class);
036    public static final SizeEstimate SIZE = SizeEstimate.create(2);
037
038    private boolean emitDone = false;
039    private int delaySlotPosition = -1;
040
041    public SPARCJumpOp(LabelRef destination) {
042        super(TYPE, destination);
043    }
044
045    public void emitControlTransfer(CompilationResultBuilder crb, SPARCMacroAssembler masm) {
046        assert !emitDone;
047        if (!crb.isSuccessorEdge(destination())) {
048            masm.bicc(ConditionFlag.Always, NOT_ANNUL, destination().label());
049            delaySlotPosition = masm.position();
050        }
051        emitDone = true;
052    }
053
054    @Override
055    public void emitCode(CompilationResultBuilder crb) {
056        if (!crb.isSuccessorEdge(destination())) {
057            if (!emitDone) {
058                SPARCMacroAssembler masm = (SPARCMacroAssembler) crb.asm;
059                masm.bicc(ConditionFlag.Always, NOT_ANNUL, destination().label());
060                masm.nop();
061            } else {
062                int disp = crb.asm.position() - delaySlotPosition;
063                assert disp == 4 : disp;
064            }
065        }
066    }
067
068    public static SizeEstimate getSize() {
069        return SIZE;
070    }
071
072    public void resetState() {
073        delaySlotPosition = -1;
074        emitDone = false;
075    }
076}