SPARCTailDelayedLIRInstruction.java revision 12651:6ef01bd40ce2 
1/*
2 * Copyright (c) 2013, 2014, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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22 */
23package org.graalvm.compiler.lir.sparc;
24
25import org.graalvm.compiler.asm.sparc.SPARCMacroAssembler;
26import org.graalvm.compiler.lir.LIRInstruction;
27
28/**
29 * Implementors of this interface are able to place its last instruction into the delay slot of a
30 * {@link SPARCDelayedControlTransfer} instruction.
31 *
32 * The implementor has to do following steps to emit code into the delay slot for the
33 * DelayedControlTransfer instruction:
34 * <ol>
35 * <li>Emit everything up to the second last instruction.</li>
36 * <li>Call
37 * {@link SPARCDelayedControlTransfer#emitControlTransfer(org.graalvm.compiler.lir.asm.CompilationResultBuilder, SPARCMacroAssembler)}
38 * to let the DelayedControlTransfer instruction emit its own code (But must not stuff the delay
39 * slot with Nop)</li>
40 * <li>emit the last instruction for this {@link LIRInstruction}</li>
41 * </ol>
42 *
43 * Note: If this instruction decides not to use the delay slot, it can skip the call of
44 * {@link SPARCDelayedControlTransfer#emitControlTransfer(org.graalvm.compiler.lir.asm.CompilationResultBuilder, SPARCMacroAssembler)}
45 * . The DelayedControlTransfer instruction will emit the code just with Nop in the delay slot.
46 */
47public interface SPARCTailDelayedLIRInstruction extends SPARCLIRInstructionMixin {
48    default void setDelayedControlTransfer(SPARCDelayedControlTransfer holder) {
49        getSPARCLIRInstructionStore().delayedControlTransfer = holder;
50    }
51
52    default SPARCDelayedControlTransfer getDelayedControlTransfer() {
53        return getSPARCLIRInstructionStore().delayedControlTransfer;
54    }
55}
56