001/*
002 * Copyright (c) 2013, 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 jdk.internal.jvmci.amd64.AMD64.*;
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.StandardOp.SaveRegistersOp;
032import com.oracle.graal.lir.asm.*;
033import com.oracle.graal.lir.framemap.*;
034
035/**
036 * Pops the current frame off the stack including the return address and restores the return
037 * registers stored on the stack.
038 */
039@Opcode("LEAVE_CURRENT_STACK_FRAME")
040final class AMD64HotSpotLeaveCurrentStackFrameOp extends AMD64HotSpotEpilogueOp {
041
042    public static final LIRInstructionClass<AMD64HotSpotLeaveCurrentStackFrameOp> TYPE = LIRInstructionClass.create(AMD64HotSpotLeaveCurrentStackFrameOp.class);
043
044    private final SaveRegistersOp saveRegisterOp;
045
046    public AMD64HotSpotLeaveCurrentStackFrameOp(SaveRegistersOp saveRegisterOp, AllocatableValue savedRbp) {
047        super(TYPE, savedRbp);
048        this.saveRegisterOp = saveRegisterOp;
049    }
050
051    @Override
052    public void emitCode(CompilationResultBuilder crb, AMD64MacroAssembler masm) {
053        FrameMap frameMap = crb.frameMap;
054        RegisterConfig registerConfig = frameMap.getRegisterConfig();
055        RegisterSaveLayout registerSaveLayout = saveRegisterOp.getMap(frameMap);
056        Register stackPointer = registerConfig.getFrameRegister();
057
058        // Restore integer result register.
059        final int stackSlotSize = frameMap.getTarget().wordSize;
060        Register integerResultRegister = registerConfig.getReturnRegister(Kind.Long);
061        masm.movptr(integerResultRegister, new AMD64Address(stackPointer, registerSaveLayout.registerToSlot(integerResultRegister) * stackSlotSize));
062        masm.movptr(rdx, new AMD64Address(stackPointer, registerSaveLayout.registerToSlot(rdx) * stackSlotSize));
063
064        // Restore float result register.
065        Register floatResultRegister = registerConfig.getReturnRegister(Kind.Double);
066        masm.movdbl(floatResultRegister, new AMD64Address(stackPointer, registerSaveLayout.registerToSlot(floatResultRegister) * stackSlotSize));
067
068        /*
069         * All of the register save area will be popped of the stack. Only the return address
070         * remains.
071         */
072        leaveFrameAndRestoreRbp(crb, masm);
073
074        // Remove return address.
075        masm.addq(stackPointer, crb.target.arch.getReturnAddressSize());
076    }
077}