1 /*
   2  * Copyright (c) 2013, 2018, 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.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 
  25 package org.graalvm.compiler.lir.sparc;
  26 
  27 import org.graalvm.compiler.asm.sparc.SPARCMacroAssembler;
  28 import org.graalvm.compiler.lir.LIRInstruction;
  29 
  30 /**
  31  * Implementors of this interface are able to place its last instruction into the delay slot of a
  32  * {@link SPARCDelayedControlTransfer} instruction.
  33  *
  34  * The implementor has to do following steps to emit code into the delay slot for the
  35  * DelayedControlTransfer instruction:
  36  * <ol>
  37  * <li>Emit everything up to the second last instruction.</li>
  38  * <li>Call
  39  * {@link SPARCDelayedControlTransfer#emitControlTransfer(org.graalvm.compiler.lir.asm.CompilationResultBuilder, SPARCMacroAssembler)}
  40  * to let the DelayedControlTransfer instruction emit its own code (But must not stuff the delay
  41  * slot with Nop)</li>
  42  * <li>emit the last instruction for this {@link LIRInstruction}</li>
  43  * </ol>
  44  *
  45  * Note: If this instruction decides not to use the delay slot, it can skip the call of
  46  * {@link SPARCDelayedControlTransfer#emitControlTransfer(org.graalvm.compiler.lir.asm.CompilationResultBuilder, SPARCMacroAssembler)}
  47  * . The DelayedControlTransfer instruction will emit the code just with Nop in the delay slot.
  48  */
  49 public interface SPARCTailDelayedLIRInstruction extends SPARCLIRInstructionMixin {
  50     default void setDelayedControlTransfer(SPARCDelayedControlTransfer holder) {
  51         getSPARCLIRInstructionStore().delayedControlTransfer = holder;
  52     }
  53 
  54     default SPARCDelayedControlTransfer getDelayedControlTransfer() {
  55         return getSPARCLIRInstructionStore().delayedControlTransfer;
  56     }
  57 }