/*

 * Copyright (c) 2015, 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

 * questions.

 */

package org.graalvm.compiler.replacements.amd64;

import static org.graalvm.compiler.replacements.StandardGraphBuilderPlugins.registerPlatformSpecificUnsafePlugins;

import static org.graalvm.compiler.replacements.nodes.BinaryMathIntrinsicNode.BinaryOperation.POW;

import static org.graalvm.compiler.replacements.nodes.UnaryMathIntrinsicNode.UnaryOperation.COS;

import static org.graalvm.compiler.replacements.nodes.UnaryMathIntrinsicNode.UnaryOperation.EXP;

import static org.graalvm.compiler.replacements.nodes.UnaryMathIntrinsicNode.UnaryOperation.LOG;

import static org.graalvm.compiler.replacements.nodes.UnaryMathIntrinsicNode.UnaryOperation.LOG10;

import static org.graalvm.compiler.replacements.nodes.UnaryMathIntrinsicNode.UnaryOperation.SIN;

import static org.graalvm.compiler.replacements.nodes.UnaryMathIntrinsicNode.UnaryOperation.TAN;

import static org.graalvm.compiler.serviceprovider.JavaVersionUtil.Java11OrEarlier;

import static org.graalvm.compiler.serviceprovider.JavaVersionUtil.Java8OrEarlier;

import java.util.Arrays;

import org.graalvm.compiler.bytecode.BytecodeProvider;

import org.graalvm.compiler.lir.amd64.AMD64ArithmeticLIRGeneratorTool.RoundingMode;

import org.graalvm.compiler.nodes.PauseNode;

import org.graalvm.compiler.nodes.ValueNode;

import org.graalvm.compiler.nodes.graphbuilderconf.GraphBuilderConfiguration.Plugins;

import org.graalvm.compiler.nodes.graphbuilderconf.GraphBuilderContext;

import org.graalvm.compiler.nodes.graphbuilderconf.InvocationPlugin;

import org.graalvm.compiler.nodes.graphbuilderconf.InvocationPlugin.Receiver;

import org.graalvm.compiler.nodes.graphbuilderconf.InvocationPlugins;

import org.graalvm.compiler.nodes.graphbuilderconf.InvocationPlugins.Registration;

import org.graalvm.compiler.nodes.java.AtomicReadAndAddNode;

import org.graalvm.compiler.nodes.java.AtomicReadAndWriteNode;

import org.graalvm.compiler.nodes.memory.address.OffsetAddressNode;

import org.graalvm.compiler.replacements.ArraysSubstitutions;

import org.graalvm.compiler.replacements.IntegerSubstitutions;

import org.graalvm.compiler.replacements.LongSubstitutions;

import org.graalvm.compiler.replacements.StandardGraphBuilderPlugins.UnsafeAccessPlugin;

import org.graalvm.compiler.replacements.StandardGraphBuilderPlugins.UnsafeGetPlugin;

import org.graalvm.compiler.replacements.StandardGraphBuilderPlugins.UnsafePutPlugin;

import org.graalvm.compiler.replacements.nodes.BinaryMathIntrinsicNode;

import org.graalvm.compiler.replacements.nodes.BinaryMathIntrinsicNode.BinaryOperation;

import org.graalvm.compiler.replacements.nodes.BitCountNode;

import org.graalvm.compiler.replacements.nodes.UnaryMathIntrinsicNode;

import org.graalvm.compiler.replacements.nodes.UnaryMathIntrinsicNode.UnaryOperation;

import jdk.vm.ci.amd64.AMD64;

import jdk.vm.ci.amd64.AMD64.CPUFeature;

import jdk.vm.ci.meta.JavaKind;

import jdk.vm.ci.meta.ResolvedJavaMethod;

import sun.misc.Unsafe;

public class AMD64GraphBuilderPlugins {

        InvocationPlugins invocationPlugins = plugins.getInvocationPlugins();

        invocationPlugins.defer(new Runnable() {

            @Override

            public void run() {

                registerThreadPlugins(invocationPlugins, arch);

                registerIntegerLongPlugins(invocationPlugins, IntegerSubstitutions.class, JavaKind.Int, arch, replacementsBytecodeProvider);

                registerIntegerLongPlugins(invocationPlugins, LongSubstitutions.class, JavaKind.Long, arch, replacementsBytecodeProvider);

                registerPlatformSpecificUnsafePlugins(invocationPlugins, replacementsBytecodeProvider, explicitUnsafeNullChecks,

                                new JavaKind[]{JavaKind.Int, JavaKind.Long, JavaKind.Object, JavaKind.Boolean, JavaKind.Byte, JavaKind.Short, JavaKind.Char, JavaKind.Float, JavaKind.Double});

                registerUnsafePlugins(invocationPlugins, replacementsBytecodeProvider, explicitUnsafeNullChecks);

                registerStringPlugins(invocationPlugins, replacementsBytecodeProvider);

                registerMathPlugins(invocationPlugins, arch, replacementsBytecodeProvider);

                registerArraysEqualsPlugins(invocationPlugins, replacementsBytecodeProvider);

            }

        });

    }

    private static void registerThreadPlugins(InvocationPlugins plugins, AMD64 arch) {

        if (!Java8OrEarlier) {

            // Pause instruction introduced with SSE2

            if (arch.getFeatures().contains(AMD64.CPUFeature.SSE2)) {

                Registration r = new Registration(plugins, Thread.class);

                r.register0("onSpinWait", new InvocationPlugin() {

                    @Override

                    public boolean apply(GraphBuilderContext b, ResolvedJavaMethod targetMethod, Receiver receiver) {

                        b.append(new PauseNode());

                        return true;

                    }

                });

            }

        }

    }

    private static void registerIntegerLongPlugins(InvocationPlugins plugins, Class<?> substituteDeclaringClass, JavaKind kind, AMD64 arch, BytecodeProvider bytecodeProvider) {

        Class<?> declaringClass = kind.toBoxedJavaClass();

        Class<?> type = kind.toJavaClass();

        Registration r = new Registration(plugins, declaringClass, bytecodeProvider);

        if (arch.getFeatures().contains(AMD64.CPUFeature.LZCNT) && arch.getFlags().contains(AMD64.Flag.UseCountLeadingZerosInstruction)) {

            r.register1("numberOfLeadingZeros", type, new InvocationPlugin() {

                @Override

                public boolean apply(GraphBuilderContext b, ResolvedJavaMethod targetMethod, Receiver receiver, ValueNode value) {

                    ValueNode folded = AMD64CountLeadingZerosNode.tryFold(value);

                    if (folded != null) {

                        b.addPush(JavaKind.Int, folded);

                    } else {

                        b.addPush(JavaKind.Int, new AMD64CountLeadingZerosNode(value));

                    }

                    return true;

                }

            });

        } else {

            r.registerMethodSubstitution(substituteDeclaringClass, "numberOfLeadingZeros", type);

        }

        if (arch.getFeatures().contains(AMD64.CPUFeature.BMI1) && arch.getFlags().contains(AMD64.Flag.UseCountTrailingZerosInstruction)) {

            r.register1("numberOfTrailingZeros", type, new InvocationPlugin() {

                @Override

                public boolean apply(GraphBuilderContext b, ResolvedJavaMethod targetMethod, Receiver receiver, ValueNode value) {

                    ValueNode folded = AMD64CountTrailingZerosNode.tryFold(value);

                    if (folded != null) {

                        b.addPush(JavaKind.Int, folded);

                    } else {

                        b.addPush(JavaKind.Int, new AMD64CountTrailingZerosNode(value));

                    }

                    return true;

                }

            });

        } else {

            r.registerMethodSubstitution(substituteDeclaringClass, "numberOfTrailingZeros", type);

        }

        if (arch.getFeatures().contains(AMD64.CPUFeature.POPCNT)) {

            r.register1("bitCount", type, new InvocationPlugin() {

                @Override

                public boolean apply(GraphBuilderContext b, ResolvedJavaMethod targetMethod, Receiver receiver, ValueNode value) {

                    b.push(JavaKind.Int, b.append(new BitCountNode(value).canonical(null)));

                    return true;

                }

            });

        }

    }

    private static void registerMathPlugins(InvocationPlugins plugins, AMD64 arch, BytecodeProvider bytecodeProvider) {

        Registration r = new Registration(plugins, Math.class, bytecodeProvider);

        registerUnaryMath(r, "log", LOG);

        registerUnaryMath(r, "log10", LOG10);

        registerUnaryMath(r, "exp", EXP);

        registerBinaryMath(r, "pow", POW);

        registerUnaryMath(r, "sin", SIN);

        registerUnaryMath(r, "cos", COS);

        registerUnaryMath(r, "tan", TAN);

        if (arch.getFeatures().contains(CPUFeature.SSE4_1)) {

            registerRound(r, "rint", RoundingMode.NEAREST);

            registerRound(r, "ceil", RoundingMode.UP);

            registerRound(r, "floor", RoundingMode.DOWN);

        }

    }

    private static void registerUnaryMath(Registration r, String name, UnaryOperation operation) {

        r.register1(name, Double.TYPE, new InvocationPlugin() {

            @Override

            public boolean apply(GraphBuilderContext b, ResolvedJavaMethod targetMethod, Receiver receiver, ValueNode value) {

                b.push(JavaKind.Double, b.append(UnaryMathIntrinsicNode.create(value, operation)));

                return true;

            }

        });

    }

    private static void registerBinaryMath(Registration r, String name, BinaryOperation operation) {

        r.register2(name, Double.TYPE, Double.TYPE, new InvocationPlugin() {

            @Override

            public boolean apply(GraphBuilderContext b, ResolvedJavaMethod targetMethod, Receiver receiver, ValueNode x, ValueNode y) {

                b.push(JavaKind.Double, b.append(BinaryMathIntrinsicNode.create(x, y, operation)));

                return true;

            }

        });

    }

    private static void registerRound(Registration r, String name, RoundingMode mode) {

        r.register1(name, Double.TYPE, new InvocationPlugin() {

            @Override

            public boolean apply(GraphBuilderContext b, ResolvedJavaMethod targetMethod, Receiver receiver, ValueNode arg) {

                b.push(JavaKind.Double, b.append(new AMD64RoundNode(arg, mode)));

                return true;

            }

        });

    }

    private static void registerStringPlugins(InvocationPlugins plugins, BytecodeProvider replacementsBytecodeProvider) {

        if (Java8OrEarlier) {

            Registration r;

            r = new Registration(plugins, String.class, replacementsBytecodeProvider);

            r.setAllowOverwrite(true);

            r.registerMethodSubstitution(AMD64StringSubstitutions.class, "indexOf", char[].class, int.class,

                            int.class, char[].class, int.class, int.class, int.class);

            r.registerMethodSubstitution(AMD64StringSubstitutions.class, "indexOf", Receiver.class, int.class, int.class);

            r.registerMethodSubstitution(AMD64StringSubstitutions.class, "compareTo", Receiver.class, String.class);

        }

    }

    private static void registerStringLatin1Plugins(InvocationPlugins plugins, BytecodeProvider replacementsBytecodeProvider) {

    }

    private static void registerStringUTF16Plugins(InvocationPlugins plugins, BytecodeProvider replacementsBytecodeProvider) {

    }

    private static void registerUnsafePlugins(InvocationPlugins plugins, BytecodeProvider replacementsBytecodeProvider, boolean explicitUnsafeNullChecks) {

        registerUnsafePlugins(new Registration(plugins, Unsafe.class), explicitUnsafeNullChecks, new JavaKind[]{JavaKind.Int, JavaKind.Long, JavaKind.Object}, true);

        if (!Java8OrEarlier) {

            registerUnsafePlugins(new Registration(plugins, "jdk.internal.misc.Unsafe", replacementsBytecodeProvider), explicitUnsafeNullChecks,

                            new JavaKind[]{JavaKind.Boolean, JavaKind.Byte, JavaKind.Char, JavaKind.Short, JavaKind.Int, JavaKind.Long, JavaKind.Object}, Java11OrEarlier);

        }

    }

    private static void registerUnsafePlugins(Registration r, boolean explicitUnsafeNullChecks, JavaKind[] unsafeJavaKinds, boolean java11OrEarlier) {

        for (JavaKind kind : unsafeJavaKinds) {

            Class<?> javaClass = kind == JavaKind.Object ? Object.class : kind.toJavaClass();

            String kindName = (kind == JavaKind.Object && !java11OrEarlier) ? "Reference" : kind.name();

            r.register4("getAndSet" + kindName, Receiver.class, Object.class, long.class, javaClass, new UnsafeAccessPlugin(kind, explicitUnsafeNullChecks) {

                @Override

                public boolean apply(GraphBuilderContext b, ResolvedJavaMethod targetMethod, Receiver unsafe, ValueNode object, ValueNode offset, ValueNode value) {

                    // Emits a null-check for the otherwise unused receiver

                    unsafe.get();

                    createUnsafeAccess(object, b, (obj, loc) -> new AtomicReadAndWriteNode(obj, offset, value, kind, loc));

                    return true;

                }

            });

            if (kind != JavaKind.Boolean && kind.isNumericInteger()) {

                r.register4("getAndAdd" + kindName, Receiver.class, Object.class, long.class, javaClass, new UnsafeAccessPlugin(kind, explicitUnsafeNullChecks) {

                    @Override

                    public boolean apply(GraphBuilderContext b, ResolvedJavaMethod targetMethod, Receiver unsafe, ValueNode object, ValueNode offset, ValueNode delta) {

                        // Emits a null-check for the otherwise unused receiver

                        unsafe.get();

                        createUnsafeAccess(object, b, (obj, loc) -> new AtomicReadAndAddNode(b.add(new OffsetAddressNode(obj, offset)), delta, kind, loc));

                        return true;

                    }

                });

            }

        }

        for (JavaKind kind : new JavaKind[]{JavaKind.Char, JavaKind.Short, JavaKind.Int, JavaKind.Long}) {

            Class<?> javaClass = kind.toJavaClass();

            r.registerOptional3("get" + kind.name() + "Unaligned", Receiver.class, Object.class, long.class, new UnsafeGetPlugin(kind, explicitUnsafeNullChecks));

            r.registerOptional4("put" + kind.name() + "Unaligned", Receiver.class, Object.class, long.class, javaClass, new UnsafePutPlugin(kind, explicitUnsafeNullChecks));

        }

    }

    private static void registerArraysEqualsPlugins(InvocationPlugins plugins, BytecodeProvider bytecodeProvider) {

        Registration r = new Registration(plugins, Arrays.class, bytecodeProvider);

        r.registerMethodSubstitution(ArraysSubstitutions.class, "equals", float[].class, float[].class);

        r.registerMethodSubstitution(ArraysSubstitutions.class, "equals", double[].class, double[].class);

    }

}