001/*
002 * Copyright (c) 2011, 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.hotspot.amd64;
024
025import static jdk.internal.jvmci.code.ValueUtil.*;
026import jdk.internal.jvmci.code.*;
027import jdk.internal.jvmci.meta.*;
028
029import com.oracle.graal.asm.amd64.*;
030import com.oracle.graal.lir.*;
031import com.oracle.graal.lir.amd64.*;
032import com.oracle.graal.lir.asm.*;
033
034/**
035 * Performs a hard-coded tail call to the specified target, which normally should be an
036 * {@link InstalledCode} instance.
037 */
038@Opcode("TAILCALL")
039public final class AMD64TailcallOp extends AMD64LIRInstruction {
040    public static final LIRInstructionClass<AMD64TailcallOp> TYPE = LIRInstructionClass.create(AMD64TailcallOp.class);
041
042    @Use protected Value target;
043    @Alive protected Value[] parameters;
044
045    public AMD64TailcallOp(Value[] parameters, Value target) {
046        super(TYPE);
047        this.target = target;
048        this.parameters = parameters;
049    }
050
051    @Override
052    public void emitCode(CompilationResultBuilder crb, AMD64MacroAssembler masm) {
053        // destroy the current frame (now the return address is the top of stack)
054        masm.leave();
055
056        // jump to the target method
057        masm.jmp(asRegister(target));
058        masm.ensureUniquePC();
059    }
060}