1/*
2 * Copyright (c) 2011, 2015, 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 */
23package org.graalvm.compiler.hotspot.amd64;
24
25import static jdk.vm.ci.code.ValueUtil.asRegister;
26
27import org.graalvm.compiler.asm.amd64.AMD64MacroAssembler;
28import org.graalvm.compiler.lir.LIRInstructionClass;
29import org.graalvm.compiler.lir.Opcode;
30import org.graalvm.compiler.lir.amd64.AMD64LIRInstruction;
31import org.graalvm.compiler.lir.asm.CompilationResultBuilder;
32
33import jdk.vm.ci.code.InstalledCode;
34import jdk.vm.ci.meta.Value;
35
36/**
37 * Performs a hard-coded tail call to the specified target, which normally should be an
38 * {@link InstalledCode} instance.
39 */
40@Opcode("TAILCALL")
41public final class AMD64TailcallOp extends AMD64LIRInstruction {
42    public static final LIRInstructionClass<AMD64TailcallOp> TYPE = LIRInstructionClass.create(AMD64TailcallOp.class);
43
44    @Use protected Value target;
45    @Alive protected Value[] parameters;
46
47    public AMD64TailcallOp(Value[] parameters, Value target) {
48        super(TYPE);
49        this.target = target;
50        this.parameters = parameters;
51    }
52
53    @Override
54    public void emitCode(CompilationResultBuilder crb, AMD64MacroAssembler masm) {
55        // destroy the current frame (now the return address is the top of stack)
56        masm.leave();
57
58        // jump to the target method
59        masm.jmp(asRegister(target));
60        masm.ensureUniquePC();
61    }
62}
63