hotspot/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.lir.sparc/src/org/graalvm/compiler/lir/sparc/SPARCDelayedControlTransfer.java

/*
 * Copyright (c) 2013, 2014, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 */
package org.graalvm.compiler.lir.sparc;

import org.graalvm.compiler.asm.sparc.SPARCMacroAssembler;
import org.graalvm.compiler.lir.LIRInstruction;
import org.graalvm.compiler.lir.asm.CompilationResultBuilder;

/**
 * This interface is used for {@link LIRInstruction}s which provide a delay slot for one instruction
 * from another {@link LIRInstruction}.
 *
 * @see SPARCTailDelayedLIRInstruction
 */
public interface SPARCDelayedControlTransfer {

    SPARCDelayedControlTransfer DUMMY = new SPARCDelayedControlTransfer() {
        @Override
        public void emitControlTransfer(CompilationResultBuilder crb, SPARCMacroAssembler masm) {
            // do nothing
        }

        @Override
        public String toString() {
            return "null";
        }

        @Override
        public void resetState() {
        }
    };

    /**
     * This method must be called, to generate the control transfer, but without any Nop in the
     * delay slot.
     *
     * @param crb
     * @param masm
     */
    void emitControlTransfer(CompilationResultBuilder crb, SPARCMacroAssembler masm);

    void resetState();
}