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 * 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.

 *

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package org.graalvm.compiler.lir.amd64;

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

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

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

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

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

import static org.graalvm.compiler.lir.LIRValueUtil.asJavaConstant;

import static org.graalvm.compiler.lir.LIRValueUtil.isJavaConstant;

import static java.lang.Double.doubleToRawLongBits;

import static java.lang.Float.floatToRawIntBits;

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

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

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

import org.graalvm.compiler.asm.NumUtil;

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

import org.graalvm.compiler.asm.amd64.AMD64Assembler.AMD64MIOp;

import org.graalvm.compiler.asm.amd64.AMD64Assembler.AMD64MOp;

import org.graalvm.compiler.asm.amd64.AMD64Assembler.OperandSize;

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

import org.graalvm.compiler.core.common.type.DataPointerConstant;

import org.graalvm.compiler.debug.GraalError;

import org.graalvm.compiler.lir.LIRFrameState;

import org.graalvm.compiler.lir.LIRInstructionClass;

import org.graalvm.compiler.lir.Opcode;

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

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

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

import org.graalvm.compiler.lir.VirtualStackSlot;

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

import jdk.vm.ci.amd64.AMD64;

import jdk.vm.ci.amd64.AMD64Kind;

import jdk.vm.ci.code.Register;

import jdk.vm.ci.code.StackSlot;

import jdk.vm.ci.meta.AllocatableValue;

import jdk.vm.ci.meta.Constant;

import jdk.vm.ci.meta.JavaConstant;

import jdk.vm.ci.meta.Value;

public class AMD64Move {

    private abstract static class AbstractMoveOp extends AMD64LIRInstruction implements ValueMoveOp {

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

        private AMD64Kind moveKind;

        protected AbstractMoveOp(LIRInstructionClass<? extends AbstractMoveOp> c, AMD64Kind moveKind) {

            super(c);

            this.moveKind = moveKind;

        }

        @Override

        public void emitCode(CompilationResultBuilder crb, AMD64MacroAssembler masm) {

            move(moveKind, crb, masm, getResult(), getInput());

        }

    }

    @Opcode("MOVE")

    public static final class MoveToRegOp extends AbstractMoveOp {

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

        @Def({REG, HINT}) protected AllocatableValue result;

        @Use({REG, STACK}) protected AllocatableValue input;

        public MoveToRegOp(AMD64Kind moveKind, AllocatableValue result, AllocatableValue input) {

            super(TYPE, moveKind);

            this.result = result;

            this.input = input;

        }

        @Override

        public AllocatableValue getInput() {

            return input;

        }

        @Override

        public AllocatableValue getResult() {

            return result;

        }

    }

    @Opcode("MOVE")

    public static final class MoveFromRegOp extends AbstractMoveOp {

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

        @Def({REG, STACK}) protected AllocatableValue result;

        @Use({REG, HINT}) protected AllocatableValue input;

        public MoveFromRegOp(AMD64Kind moveKind, AllocatableValue result, AllocatableValue input) {

            super(TYPE, moveKind);

            this.result = result;

            this.input = input;

        }

        @Override

        public AllocatableValue getInput() {

            return input;

        }

        @Override

        public AllocatableValue getResult() {

            return result;

        }

    }

    @Opcode("MOVE")

    public static class MoveFromConstOp extends AMD64LIRInstruction implements LoadConstantOp {

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

        @Def({REG, STACK}) protected AllocatableValue result;

        private final JavaConstant input;

        public MoveFromConstOp(AllocatableValue result, JavaConstant input) {

            super(TYPE);

            this.result = result;

            this.input = input;

        }

        @Override

        public void emitCode(CompilationResultBuilder crb, AMD64MacroAssembler masm) {

            if (isRegister(result)) {

                const2reg(crb, masm, asRegister(result), input);

            } else {

                assert isStackSlot(result);

                const2stack(crb, masm, result, input);

            }

        }

        @Override

        public Constant getConstant() {

            return input;

        }

        @Override

        public AllocatableValue getResult() {

            return result;

        }

    }

    @Opcode("STACKMOVE")

    public static final class AMD64StackMove extends AMD64LIRInstruction implements ValueMoveOp {

        public static final LIRInstructionClass<AMD64StackMove> TYPE = LIRInstructionClass.create(AMD64StackMove.class);

        @Def({STACK}) protected AllocatableValue result;

        @Use({STACK, HINT}) protected AllocatableValue input;

        @Alive({OperandFlag.STACK, OperandFlag.UNINITIALIZED}) private AllocatableValue backupSlot;

        private Register scratch;

        public AMD64StackMove(AllocatableValue result, AllocatableValue input, Register scratch, AllocatableValue backupSlot) {

            super(TYPE);

            this.result = result;

            this.input = input;

            this.backupSlot = backupSlot;

            this.scratch = scratch;

        }

        @Override

        public AllocatableValue getInput() {

            return input;

        }

        @Override

        public AllocatableValue getResult() {

            return result;

        }

        public Register getScratchRegister() {

            return scratch;

        }

        public AllocatableValue getBackupSlot() {

            return backupSlot;

        }

        @Override

        public void emitCode(CompilationResultBuilder crb, AMD64MacroAssembler masm) {

            AMD64Kind backupKind = (AMD64Kind) backupSlot.getPlatformKind();

            if (backupKind.isXMM()) {

                // graal doesn't use vector values, so it's safe to backup using DOUBLE

                backupKind = AMD64Kind.DOUBLE;

            }

            // backup scratch register

            reg2stack(backupKind, crb, masm, backupSlot, scratch);

            // move stack slot

            stack2reg((AMD64Kind) getInput().getPlatformKind(), crb, masm, scratch, getInput());

            reg2stack((AMD64Kind) getResult().getPlatformKind(), crb, masm, getResult(), scratch);

            // restore scratch register

            stack2reg(backupKind, crb, masm, scratch, backupSlot);

        }

    }

    @Opcode("MULTISTACKMOVE")

    public static final class AMD64MultiStackMove extends AMD64LIRInstruction {

        public static final LIRInstructionClass<AMD64MultiStackMove> TYPE = LIRInstructionClass.create(AMD64MultiStackMove.class);

        @Def({STACK}) protected AllocatableValue[] results;

        @Use({STACK}) protected Value[] inputs;

        @Alive({OperandFlag.STACK, OperandFlag.UNINITIALIZED}) private AllocatableValue backupSlot;

        private Register scratch;

        public AMD64MultiStackMove(AllocatableValue[] results, Value[] inputs, Register scratch, AllocatableValue backupSlot) {

            super(TYPE);

            this.results = results;

            this.inputs = inputs;

            this.backupSlot = backupSlot;

            this.scratch = scratch;

        }

        @Override

        public void emitCode(CompilationResultBuilder crb, AMD64MacroAssembler masm) {

            AMD64Kind backupKind = (AMD64Kind) backupSlot.getPlatformKind();

            if (backupKind.isXMM()) {

                // graal doesn't use vector values, so it's safe to backup using DOUBLE

                backupKind = AMD64Kind.DOUBLE;

            }

            // backup scratch register

            move(backupKind, crb, masm, backupSlot, scratch.asValue(backupSlot.getValueKind()));

            for (int i = 0; i < results.length; i++) {

                Value input = inputs[i];

                AllocatableValue result = results[i];

                // move stack slot

                move((AMD64Kind) input.getPlatformKind(), crb, masm, scratch.asValue(input.getValueKind()), input);

                move((AMD64Kind) result.getPlatformKind(), crb, masm, result, scratch.asValue(result.getValueKind()));

            }

            // restore scratch register

            move(backupKind, crb, masm, scratch.asValue(backupSlot.getValueKind()), backupSlot);

        }

    }

    @Opcode("STACKMOVE")

    public static final class AMD64PushPopStackMove extends AMD64LIRInstruction implements ValueMoveOp {

        public static final LIRInstructionClass<AMD64PushPopStackMove> TYPE = LIRInstructionClass.create(AMD64PushPopStackMove.class);

        @Def({STACK}) protected AllocatableValue result;

        @Use({STACK, HINT}) protected AllocatableValue input;

        private final OperandSize size;

        public AMD64PushPopStackMove(OperandSize size, AllocatableValue result, AllocatableValue input) {

            super(TYPE);

            this.result = result;

            this.input = input;

            this.size = size;

        }

        @Override

        public AllocatableValue getInput() {

            return input;

        }

        @Override

        public AllocatableValue getResult() {

            return result;

        }

        @Override

        public void emitCode(CompilationResultBuilder crb, AMD64MacroAssembler masm) {

            AMD64MOp.PUSH.emit(masm, size, (AMD64Address) crb.asAddress(input));

            AMD64MOp.POP.emit(masm, size, (AMD64Address) crb.asAddress(result));

        }

    }

    public static final class LeaOp extends AMD64LIRInstruction {

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

        @Def({REG}) protected AllocatableValue result;

        @Use({COMPOSITE, UNINITIALIZED}) protected AMD64AddressValue address;

        public LeaOp(AllocatableValue result, AMD64AddressValue address) {

            super(TYPE);

            this.result = result;

            this.address = address;

        }

        @Override

        public void emitCode(CompilationResultBuilder crb, AMD64MacroAssembler masm) {

            masm.leaq(asRegister(result, AMD64Kind.QWORD), address.toAddress());

        }

    }

    public static final class LeaDataOp extends AMD64LIRInstruction {

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

        @Def({REG}) protected AllocatableValue result;

        private final DataPointerConstant data;

        public LeaDataOp(AllocatableValue result, DataPointerConstant data) {

            super(TYPE);

            this.result = result;

            this.data = data;

        }

        @Override

        public void emitCode(CompilationResultBuilder crb, AMD64MacroAssembler masm) {

            masm.leaq(asRegister(result), (AMD64Address) crb.recordDataReferenceInCode(data));

        }

    }

    public static final class StackLeaOp extends AMD64LIRInstruction {

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

        @Def({REG}) protected AllocatableValue result;

        @Use({STACK, UNINITIALIZED}) protected AllocatableValue slot;

        public StackLeaOp(AllocatableValue result, AllocatableValue slot) {

            super(TYPE);

            this.result = result;

            this.slot = slot;

            assert slot instanceof VirtualStackSlot || slot instanceof StackSlot;

        }

        @Override

        public void emitCode(CompilationResultBuilder crb, AMD64MacroAssembler masm) {

            masm.leaq(asRegister(result, AMD64Kind.QWORD), (AMD64Address) crb.asAddress(slot));

        }

    }

    public static final class MembarOp extends AMD64LIRInstruction {

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

        private final int barriers;

        public MembarOp(final int barriers) {

            super(TYPE);

            this.barriers = barriers;

        }

        @Override

        public void emitCode(CompilationResultBuilder crb, AMD64MacroAssembler masm) {

            masm.membar(barriers);

        }

    }

    public static final class NullCheckOp extends AMD64LIRInstruction implements NullCheck {

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

        @Use({COMPOSITE}) protected AMD64AddressValue address;

        @State protected LIRFrameState state;

        public NullCheckOp(AMD64AddressValue address, LIRFrameState state) {

            super(TYPE);

            this.address = address;

            this.state = state;

        }

        @Override

        public void emitCode(CompilationResultBuilder crb, AMD64MacroAssembler masm) {

            crb.recordImplicitException(masm.position(), state);

            masm.nullCheck(address.toAddress());

        }

        @Override

        public Value getCheckedValue() {

            return address.base;

        }

        @Override

        public LIRFrameState getState() {

            return state;

        }

    }

    @Opcode("CAS")

    public static final class CompareAndSwapOp extends AMD64LIRInstruction {

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

        private final AMD64Kind accessKind;

        @Def protected AllocatableValue result;

        @Use({COMPOSITE}) protected AMD64AddressValue address;

        @Use protected AllocatableValue cmpValue;

        @Use protected AllocatableValue newValue;

        public CompareAndSwapOp(AMD64Kind accessKind, AllocatableValue result, AMD64AddressValue address, AllocatableValue cmpValue, AllocatableValue newValue) {

            super(TYPE);

            this.accessKind = accessKind;

            this.result = result;

            this.address = address;

            this.cmpValue = cmpValue;

            this.newValue = newValue;

        }

        @Override

        public void emitCode(CompilationResultBuilder crb, AMD64MacroAssembler masm) {

            assert asRegister(cmpValue).equals(AMD64.rax) && asRegister(result).equals(AMD64.rax);

            if (crb.target.isMP) {

                masm.lock();

            }

            switch (accessKind) {

                case DWORD:

                    masm.cmpxchgl(asRegister(newValue), address.toAddress());

                    break;

                case QWORD:

                    masm.cmpxchgq(asRegister(newValue), address.toAddress());

                    break;

                default:

                    throw GraalError.shouldNotReachHere();

            }

        }

    }

    @Opcode("ATOMIC_READ_AND_ADD")

    public static final class AtomicReadAndAddOp extends AMD64LIRInstruction {

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

        private final AMD64Kind accessKind;

        @Def protected AllocatableValue result;

        @Alive({COMPOSITE}) protected AMD64AddressValue address;

        @Use protected AllocatableValue delta;

        public AtomicReadAndAddOp(AMD64Kind accessKind, AllocatableValue result, AMD64AddressValue address, AllocatableValue delta) {

            super(TYPE);

            this.accessKind = accessKind;

            this.result = result;

            this.address = address;

            this.delta = delta;

        }

        @Override

        public void emitCode(CompilationResultBuilder crb, AMD64MacroAssembler masm) {

            move(accessKind, crb, masm, result, delta);

            if (crb.target.isMP) {

                masm.lock();

            }

            switch (accessKind) {

                case DWORD:

                    masm.xaddl(address.toAddress(), asRegister(result));

                    break;

                case QWORD:

                    masm.xaddq(address.toAddress(), asRegister(result));

                    break;

                default:

                    throw GraalError.shouldNotReachHere();

            }

        }

    }

    @Opcode("ATOMIC_READ_AND_WRITE")

    public static final class AtomicReadAndWriteOp extends AMD64LIRInstruction {

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

        private final AMD64Kind accessKind;

        @Def protected AllocatableValue result;

        @Alive({COMPOSITE}) protected AMD64AddressValue address;

        @Use protected AllocatableValue newValue;

        public AtomicReadAndWriteOp(AMD64Kind accessKind, AllocatableValue result, AMD64AddressValue address, AllocatableValue newValue) {

            super(TYPE);

            this.accessKind = accessKind;

            this.result = result;

            this.address = address;

            this.newValue = newValue;

        }

        @Override

        public void emitCode(CompilationResultBuilder crb, AMD64MacroAssembler masm) {

            move(accessKind, crb, masm, result, newValue);

            switch (accessKind) {

                case DWORD:

                    masm.xchgl(asRegister(result), address.toAddress());

                    break;

                case QWORD:

                    masm.xchgq(asRegister(result), address.toAddress());

                    break;

                default:

                    throw GraalError.shouldNotReachHere();

            }

        }

    }

    public static void move(CompilationResultBuilder crb, AMD64MacroAssembler masm, Value result, Value input) {

        move((AMD64Kind) result.getPlatformKind(), crb, masm, result, input);

    }

    public static void move(AMD64Kind moveKind, CompilationResultBuilder crb, AMD64MacroAssembler masm, Value result, Value input) {

        if (isRegister(input)) {

            if (isRegister(result)) {

                reg2reg(moveKind, masm, result, input);

            } else if (isStackSlot(result)) {

                reg2stack(moveKind, crb, masm, result, asRegister(input));

            } else {

                throw GraalError.shouldNotReachHere();

            }

        } else if (isStackSlot(input)) {

            if (isRegister(result)) {

                stack2reg(moveKind, crb, masm, asRegister(result), input);

            } else {

                throw GraalError.shouldNotReachHere();

            }

        } else if (isJavaConstant(input)) {

            if (isRegister(result)) {

                const2reg(crb, masm, asRegister(result), asJavaConstant(input));

            } else if (isStackSlot(result)) {

                const2stack(crb, masm, result, asJavaConstant(input));

            } else {

                throw GraalError.shouldNotReachHere();

            }

        } else {

            throw GraalError.shouldNotReachHere();