/*

 * Copyright (c) 2013, 2018, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

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 */

package org.graalvm.compiler.hotspot.amd64;

import static jdk.vm.ci.amd64.AMD64.rdx;

import org.graalvm.compiler.asm.amd64.AMD64Address;

import org.graalvm.compiler.asm.amd64.AMD64MacroAssembler;

import org.graalvm.compiler.lir.LIRInstructionClass;

import org.graalvm.compiler.lir.Opcode;

import org.graalvm.compiler.lir.StandardOp.SaveRegistersOp;

import org.graalvm.compiler.lir.asm.CompilationResultBuilder;

import org.graalvm.compiler.lir.framemap.FrameMap;

import jdk.vm.ci.code.Register;

import jdk.vm.ci.code.RegisterConfig;

import jdk.vm.ci.code.RegisterSaveLayout;

import jdk.vm.ci.meta.JavaKind;

/**

 * Pops the current frame off the stack including the return address and restores the return

 * registers stored on the stack.

 */

@Opcode("LEAVE_CURRENT_STACK_FRAME")

final class AMD64HotSpotLeaveCurrentStackFrameOp extends AMD64HotSpotEpilogueOp {

    public static final LIRInstructionClass<AMD64HotSpotLeaveCurrentStackFrameOp> TYPE = LIRInstructionClass.create(AMD64HotSpotLeaveCurrentStackFrameOp.class);

    private final SaveRegistersOp saveRegisterOp;

    AMD64HotSpotLeaveCurrentStackFrameOp(SaveRegistersOp saveRegisterOp) {

        super(TYPE);

        this.saveRegisterOp = saveRegisterOp;

    }

    @Override

    public void emitCode(CompilationResultBuilder crb, AMD64MacroAssembler masm) {

        FrameMap frameMap = crb.frameMap;

        RegisterConfig registerConfig = frameMap.getRegisterConfig();

        RegisterSaveLayout registerSaveLayout = saveRegisterOp.getMap(frameMap);

        Register stackPointer = registerConfig.getFrameRegister();

        // Restore integer result register.

        final int stackSlotSize = frameMap.getTarget().wordSize;

        Register integerResultRegister = registerConfig.getReturnRegister(JavaKind.Long);

        masm.movptr(integerResultRegister, new AMD64Address(stackPointer, registerSaveLayout.registerToSlot(integerResultRegister) * stackSlotSize));

        masm.movptr(rdx, new AMD64Address(stackPointer, registerSaveLayout.registerToSlot(rdx) * stackSlotSize));

        // Restore float result register.

        Register floatResultRegister = registerConfig.getReturnRegister(JavaKind.Double);

        masm.movdbl(floatResultRegister, new AMD64Address(stackPointer, registerSaveLayout.registerToSlot(floatResultRegister) * stackSlotSize));

        /*

         * All of the register save area will be popped of the stack. Only the return address

         * remains.

         */

        leaveFrameAndRestoreRbp(crb, masm);

        // Remove return address.

        masm.addq(stackPointer, crb.target.arch.getReturnAddressSize());

    }

}