/*

 * 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

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package org.graalvm.compiler.hotspot.amd64;

import static org.graalvm.compiler.lir.LIRInstruction.OperandFlag.REG;

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

import static jdk.vm.ci.code.ValueUtil.asRegister;

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

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

import org.graalvm.compiler.hotspot.GraalHotSpotVMConfig;

import org.graalvm.compiler.lir.LIRInstructionClass;

import org.graalvm.compiler.lir.Opcode;

import org.graalvm.compiler.lir.amd64.AMD64LIRInstruction;

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

import jdk.vm.ci.code.Register;

import jdk.vm.ci.meta.AllocatableValue;

/**

 * Pushes an interpreter frame to the stack.

 */

@Opcode("PUSH_INTERPRETER_FRAME")

final class AMD64HotSpotPushInterpreterFrameOp extends AMD64LIRInstruction {

    public static final LIRInstructionClass<AMD64HotSpotPushInterpreterFrameOp> TYPE = LIRInstructionClass.create(AMD64HotSpotPushInterpreterFrameOp.class);

    @Alive(REG) AllocatableValue frameSize;

    @Alive(REG) AllocatableValue framePc;

    @Alive(REG) AllocatableValue senderSp;

    @Alive(REG) AllocatableValue initialInfo;

    private final GraalHotSpotVMConfig config;

    AMD64HotSpotPushInterpreterFrameOp(AllocatableValue frameSize, AllocatableValue framePc, AllocatableValue senderSp, AllocatableValue initialInfo, GraalHotSpotVMConfig config) {

        super(TYPE);

        this.frameSize = frameSize;

        this.framePc = framePc;

        this.senderSp = senderSp;

        this.initialInfo = initialInfo;

        this.config = config;

    }

    @Override

    public void emitCode(CompilationResultBuilder crb, AMD64MacroAssembler masm) {

        final Register frameSizeRegister = asRegister(frameSize);

        final Register framePcRegister = asRegister(framePc);

        final Register senderSpRegister = asRegister(senderSp);

        final Register initialInfoRegister = asRegister(initialInfo);

        final int wordSize = 8;

        // We'll push PC and BP by hand.

        masm.subq(frameSizeRegister, 2 * wordSize);

        // Push return address.

        masm.push(framePcRegister);

        // Prolog

        masm.push(initialInfoRegister);

        masm.movq(initialInfoRegister, rsp);

        masm.subq(rsp, frameSizeRegister);

        // This value is corrected by layout_activation_impl.

        masm.movptr(new AMD64Address(initialInfoRegister, config.frameInterpreterFrameLastSpOffset * wordSize), 0);

        // Make the frame walkable.

        masm.movq(new AMD64Address(initialInfoRegister, config.frameInterpreterFrameSenderSpOffset * wordSize), senderSpRegister);

    }

}