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.*;
026import static jdk.internal.jvmci.amd64.AMD64.*;
027import static jdk.internal.jvmci.code.ValueUtil.*;
028import jdk.internal.jvmci.code.*;
029import jdk.internal.jvmci.meta.*;
030
031import com.oracle.graal.asm.amd64.*;
032import com.oracle.graal.lir.*;
033import com.oracle.graal.lir.amd64.*;
034import com.oracle.graal.lir.asm.*;
035
036/**
037 * Superclass for operations that use the value of RBP saved in a method's prologue.
038 */
039abstract class AMD64HotSpotEpilogueOp extends AMD64LIRInstruction {
040
041    protected AMD64HotSpotEpilogueOp(LIRInstructionClass<? extends AMD64HotSpotEpilogueOp> c, AllocatableValue savedRbp) {
042        super(c);
043        this.savedRbp = savedRbp;
044    }
045
046    @Use({REG, STACK}) private AllocatableValue savedRbp;
047
048    protected void leaveFrameAndRestoreRbp(CompilationResultBuilder crb, AMD64MacroAssembler masm) {
049        leaveFrameAndRestoreRbp(savedRbp, crb, masm);
050    }
051
052    static void leaveFrameAndRestoreRbp(AllocatableValue savedRbp, CompilationResultBuilder crb, AMD64MacroAssembler masm) {
053        if (isStackSlot(savedRbp)) {
054            // Restoring RBP from the stack must be done before the frame is removed
055            masm.movq(rbp, (AMD64Address) crb.asAddress(savedRbp));
056        } else {
057            Register framePointer = asRegister(savedRbp);
058            if (!framePointer.equals(rbp)) {
059                masm.movq(rbp, framePointer);
060            }
061        }
062        crb.frameContext.leave(crb);
063    }
064}