001/*
002 * Copyright (c) 2012, 2014, 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 com.oracle.graal.lir.LIRInstruction.OperandFlag.*;
026
027import com.oracle.graal.asm.amd64.*;
028import com.oracle.graal.lir.*;
029import com.oracle.graal.lir.asm.*;
030
031import jdk.internal.jvmci.code.*;
032import jdk.internal.jvmci.hotspot.*;
033import jdk.internal.jvmci.meta.*;
034
035/**
036 * Returns from a function.
037 */
038@Opcode("RETURN")
039final class AMD64HotSpotReturnOp extends AMD64HotSpotEpilogueBlockEndOp {
040
041    public static final LIRInstructionClass<AMD64HotSpotReturnOp> TYPE = LIRInstructionClass.create(AMD64HotSpotReturnOp.class);
042    @Use({REG, ILLEGAL}) protected Value value;
043    private final boolean isStub;
044    private final Register scratchForSafepointOnReturn;
045    private final HotSpotVMConfig config;
046
047    AMD64HotSpotReturnOp(Value value, boolean isStub, Register scratchForSafepointOnReturn, HotSpotVMConfig config, AllocatableValue savedRbp) {
048        super(TYPE, savedRbp);
049        this.value = value;
050        this.isStub = isStub;
051        this.scratchForSafepointOnReturn = scratchForSafepointOnReturn;
052        this.config = config;
053    }
054
055    @Override
056    public void emitCode(CompilationResultBuilder crb, AMD64MacroAssembler masm) {
057        leaveFrameAndRestoreRbp(crb, masm);
058        if (!isStub) {
059            // Every non-stub compile method must have a poll before the return.
060            AMD64HotSpotSafepointOp.emitCode(crb, masm, config, true, null, scratchForSafepointOnReturn);
061        }
062        masm.ret(0);
063    }
064}