/*

 * Copyright (c) 2012, 2016, 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.hotspot;

import java.util.EnumSet;

import org.graalvm.compiler.code.CompilationResult;

import org.graalvm.compiler.core.common.CompilationIdentifier;

import org.graalvm.compiler.core.common.cfg.AbstractBlockBase;

import org.graalvm.compiler.core.common.spi.ForeignCallDescriptor;

import org.graalvm.compiler.core.common.spi.ForeignCallLinkage;

import org.graalvm.compiler.core.target.Backend;

import org.graalvm.compiler.graph.Node.ConstantNodeParameter;

import org.graalvm.compiler.graph.Node.NodeIntrinsic;

import org.graalvm.compiler.hotspot.meta.HotSpotProviders;

import org.graalvm.compiler.hotspot.nodes.VMErrorNode;

import org.graalvm.compiler.hotspot.nodes.aot.ResolveConstantStubCall;

import org.graalvm.compiler.hotspot.replacements.AESCryptSubstitutions;

import org.graalvm.compiler.hotspot.replacements.BigIntegerSubstitutions;

import org.graalvm.compiler.hotspot.replacements.CipherBlockChainingSubstitutions;

import org.graalvm.compiler.hotspot.replacements.SHA2Substitutions;

import org.graalvm.compiler.hotspot.replacements.SHA5Substitutions;

import org.graalvm.compiler.hotspot.replacements.SHASubstitutions;

import org.graalvm.compiler.hotspot.stubs.ExceptionHandlerStub;

import org.graalvm.compiler.hotspot.stubs.Stub;

import org.graalvm.compiler.hotspot.stubs.UnwindExceptionToCallerStub;

import org.graalvm.compiler.hotspot.word.KlassPointer;

import org.graalvm.compiler.hotspot.word.MethodCountersPointer;

import org.graalvm.compiler.lir.LIR;

import org.graalvm.compiler.lir.LIRFrameState;

import org.graalvm.compiler.lir.LIRInstruction;

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

import org.graalvm.compiler.lir.LIRInstruction.OperandMode;

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

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

import org.graalvm.compiler.lir.ValueConsumer;

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

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

import org.graalvm.compiler.nodes.UnwindNode;

import org.graalvm.compiler.nodes.extended.ForeignCallNode;

import org.graalvm.compiler.options.Option;

import org.graalvm.compiler.options.OptionKey;

import org.graalvm.compiler.options.OptionType;

import org.graalvm.compiler.options.OptionValues;

import org.graalvm.compiler.phases.tiers.SuitesProvider;

import org.graalvm.compiler.word.Pointer;

import org.graalvm.compiler.word.Word;

import org.graalvm.util.Equivalence;

import org.graalvm.util.EconomicMap;

import org.graalvm.util.EconomicSet;

import org.graalvm.util.MapCursor;

import jdk.vm.ci.code.CompilationRequest;

import jdk.vm.ci.code.CompiledCode;

import jdk.vm.ci.code.Register;

import jdk.vm.ci.code.RegisterSaveLayout;

import jdk.vm.ci.code.StackSlot;

import jdk.vm.ci.code.ValueUtil;

import jdk.vm.ci.hotspot.HotSpotCompilationRequest;

import jdk.vm.ci.hotspot.HotSpotJVMCIRuntime;

import jdk.vm.ci.hotspot.HotSpotResolvedJavaMethod;

import jdk.vm.ci.meta.ResolvedJavaMethod;

import jdk.vm.ci.meta.Value;

import jdk.vm.ci.runtime.JVMCICompiler;

/**

 * HotSpot specific backend.

 */

public abstract class HotSpotBackend extends Backend implements FrameMap.ReferenceMapBuilderFactory {

    public static class Options {

        // @formatter:off

        @Option(help = "Use Graal arithmetic stubs instead of HotSpot stubs where possible")

        public static final OptionKey<Boolean> GraalArithmeticStubs = new OptionKey<>(true);

        @Option(help = "Enables instruction profiling on assembler level. Valid values are a comma separated list of supported instructions." +

                        " Compare with subclasses of Assembler.InstructionCounter.", type = OptionType.Debug)

        public static final OptionKey<String> ASMInstructionProfiling = new OptionKey<>(null);

        // @formatter:on

    }

    /**

     * Descriptor for {@link ExceptionHandlerStub}. This stub is called by the

     * {@linkplain GraalHotSpotVMConfig#MARKID_EXCEPTION_HANDLER_ENTRY exception handler} in a

     * compiled method.

     */

    public static final ForeignCallDescriptor EXCEPTION_HANDLER = new ForeignCallDescriptor("exceptionHandler", void.class, Object.class, Word.class);

    /**

     * Descriptor for SharedRuntime::get_ic_miss_stub().

     */

    public static final ForeignCallDescriptor IC_MISS_HANDLER = new ForeignCallDescriptor("icMissHandler", void.class);

    /**

     * Descriptor for SharedRuntime::get_handle_wrong_method_stub().

     */

    public static final ForeignCallDescriptor WRONG_METHOD_HANDLER = new ForeignCallDescriptor("wrongMethodHandler", void.class);

    /**

     * Descriptor for {@link UnwindExceptionToCallerStub}. This stub is called by code generated

     * from {@link UnwindNode}.

     */

    public static final ForeignCallDescriptor UNWIND_EXCEPTION_TO_CALLER = new ForeignCallDescriptor("unwindExceptionToCaller", void.class, Object.class, Word.class);

    /**

     * Descriptor for the arguments when unwinding to an exception handler in a caller.

     */

    public static final ForeignCallDescriptor EXCEPTION_HANDLER_IN_CALLER = new ForeignCallDescriptor("exceptionHandlerInCaller", void.class, Object.class, Word.class);

    private final HotSpotGraalRuntimeProvider runtime;

    /**

     * @see AESCryptSubstitutions#encryptBlockStub(ForeignCallDescriptor, Word, Word, Pointer)

     */

    public static final ForeignCallDescriptor ENCRYPT_BLOCK = new ForeignCallDescriptor("encrypt_block", void.class, Word.class, Word.class, Pointer.class);

    /**

     * @see AESCryptSubstitutions#decryptBlockStub(ForeignCallDescriptor, Word, Word, Pointer)

     */

    public static final ForeignCallDescriptor DECRYPT_BLOCK = new ForeignCallDescriptor("decrypt_block", void.class, Word.class, Word.class, Pointer.class);

    /**

     * @see AESCryptSubstitutions#decryptBlockStub(ForeignCallDescriptor, Word, Word, Pointer)

     */

    public static final ForeignCallDescriptor DECRYPT_BLOCK_WITH_ORIGINAL_KEY = new ForeignCallDescriptor("decrypt_block_with_original_key", void.class, Word.class, Word.class, Pointer.class,

                    Pointer.class);

    /**

     * @see CipherBlockChainingSubstitutions#crypt

     */

    public static final ForeignCallDescriptor ENCRYPT = new ForeignCallDescriptor("encrypt", void.class, Word.class, Word.class, Pointer.class, Pointer.class, int.class);

    /**

     * @see CipherBlockChainingSubstitutions#crypt

     */

    public static final ForeignCallDescriptor DECRYPT = new ForeignCallDescriptor("decrypt", void.class, Word.class, Word.class, Pointer.class, Pointer.class, int.class);

    /**

     * @see CipherBlockChainingSubstitutions#crypt

     */

    public static final ForeignCallDescriptor DECRYPT_WITH_ORIGINAL_KEY = new ForeignCallDescriptor("decrypt_with_original_key", void.class, Word.class, Word.class, Pointer.class, Pointer.class,

                    int.class, Pointer.class);

    /**

     * @see BigIntegerSubstitutions#multiplyToLen

     */

    public static final ForeignCallDescriptor MULTIPLY_TO_LEN = new ForeignCallDescriptor("multiplyToLen", void.class, Word.class, int.class, Word.class, int.class, Word.class, int.class);

    public static void multiplyToLenStub(Word xAddr, int xlen, Word yAddr, int ylen, Word zAddr, int zLen) {

        multiplyToLenStub(HotSpotBackend.MULTIPLY_TO_LEN, xAddr, xlen, yAddr, ylen, zAddr, zLen);

    }

    @NodeIntrinsic(ForeignCallNode.class)

    private static native void multiplyToLenStub(@ConstantNodeParameter ForeignCallDescriptor descriptor, Word xIn, int xLen, Word yIn, int yLen, Word zIn, int zLen);

    /**

     * @see BigIntegerSubstitutions#mulAdd

     */

    public static final ForeignCallDescriptor MUL_ADD = new ForeignCallDescriptor("mulAdd", int.class, Word.class, Word.class, int.class, int.class, int.class);

    public static int mulAddStub(Word inAddr, Word outAddr, int newOffset, int len, int k) {

        return mulAddStub(HotSpotBackend.MUL_ADD, inAddr, outAddr, newOffset, len, k);

    }

    @NodeIntrinsic(ForeignCallNode.class)

    private static native int mulAddStub(@ConstantNodeParameter ForeignCallDescriptor descriptor, Word inAddr, Word outAddr, int newOffset, int len, int k);

    /**

     * @see BigIntegerSubstitutions#implMontgomeryMultiply

     */

    public static final ForeignCallDescriptor MONTGOMERY_MULTIPLY = new ForeignCallDescriptor("implMontgomeryMultiply", void.class, Word.class, Word.class, Word.class, int.class, long.class,

                    Word.class);

    public static void implMontgomeryMultiply(Word aAddr, Word bAddr, Word nAddr, int len, long inv, Word productAddr) {

        implMontgomeryMultiply(HotSpotBackend.MONTGOMERY_MULTIPLY, aAddr, bAddr, nAddr, len, inv, productAddr);

    }

    @NodeIntrinsic(ForeignCallNode.class)

    private static native void implMontgomeryMultiply(@ConstantNodeParameter ForeignCallDescriptor descriptor, Word aAddr, Word bAddr, Word nAddr, int len, long inv, Word productAddr);

    /**

     * @see BigIntegerSubstitutions#implMontgomerySquare

     */

    public static final ForeignCallDescriptor MONTGOMERY_SQUARE = new ForeignCallDescriptor("implMontgomerySquare", void.class, Word.class, Word.class, int.class, long.class, Word.class);

    public static void implMontgomerySquare(Word aAddr, Word nAddr, int len, long inv, Word productAddr) {

        implMontgomerySquare(HotSpotBackend.MONTGOMERY_SQUARE, aAddr, nAddr, len, inv, productAddr);

    }

    @NodeIntrinsic(ForeignCallNode.class)

    private static native void implMontgomerySquare(@ConstantNodeParameter ForeignCallDescriptor descriptor, Word aAddr, Word nAddr, int len, long inv, Word productAddr);

    /**

     * @see BigIntegerSubstitutions#implSquareToLen

     */

    public static final ForeignCallDescriptor SQUARE_TO_LEN = new ForeignCallDescriptor("implSquareToLen", void.class, Word.class, int.class, Word.class, int.class);

    public static void implSquareToLen(Word xAddr, int len, Word zAddr, int zLen) {

        implSquareToLen(SQUARE_TO_LEN, xAddr, len, zAddr, zLen);

    }

    @NodeIntrinsic(ForeignCallNode.class)

    private static native void implSquareToLen(@ConstantNodeParameter ForeignCallDescriptor descriptor, Word xAddr, int len, Word zAddr, int zLen);

    /**

     * @see SHASubstitutions#implCompress0

     */

    public static final ForeignCallDescriptor SHA_IMPL_COMPRESS = new ForeignCallDescriptor("shaImplCompress", void.class, Word.class, Object.class);

    public static void shaImplCompressStub(Word bufAddr, Object state) {

        shaImplCompressStub(HotSpotBackend.SHA_IMPL_COMPRESS, bufAddr, state);

    }

    @NodeIntrinsic(ForeignCallNode.class)

    private static native void shaImplCompressStub(@ConstantNodeParameter ForeignCallDescriptor descriptor, Word bufAddr, Object state);

    /**

     * @see SHA2Substitutions#implCompress0

     */

    public static final ForeignCallDescriptor SHA2_IMPL_COMPRESS = new ForeignCallDescriptor("sha2ImplCompress", void.class, Word.class, Object.class);

    public static void sha2ImplCompressStub(Word bufAddr, Object state) {

        sha2ImplCompressStub(HotSpotBackend.SHA2_IMPL_COMPRESS, bufAddr, state);

    }

    @NodeIntrinsic(ForeignCallNode.class)

    private static native void sha2ImplCompressStub(@ConstantNodeParameter ForeignCallDescriptor descriptor, Word bufAddr, Object state);

    /**

     * @see SHA5Substitutions#implCompress0

     */

    public static final ForeignCallDescriptor SHA5_IMPL_COMPRESS = new ForeignCallDescriptor("sha5ImplCompress", void.class, Word.class, Object.class);

    public static void sha5ImplCompressStub(Word bufAddr, Object state) {

        sha5ImplCompressStub(HotSpotBackend.SHA5_IMPL_COMPRESS, bufAddr, state);

    }

    @NodeIntrinsic(ForeignCallNode.class)

    private static native void sha5ImplCompressStub(@ConstantNodeParameter ForeignCallDescriptor descriptor, Word bufAddr, Object state);

    /**

     * @see VMErrorNode

     */

    public static final ForeignCallDescriptor VM_ERROR = new ForeignCallDescriptor("vm_error", void.class, Object.class, Object.class, long.class);

    /**

     * New multi array stub call.

     */

    public static final ForeignCallDescriptor NEW_MULTI_ARRAY = new ForeignCallDescriptor("new_multi_array", Object.class, KlassPointer.class, int.class, Word.class);

    /**

     * New array stub.

     */

    public static final ForeignCallDescriptor NEW_ARRAY = new ForeignCallDescriptor("new_array", Object.class, KlassPointer.class, int.class, boolean.class);

    /**

     * New instance stub.

     */

    public static final ForeignCallDescriptor NEW_INSTANCE = new ForeignCallDescriptor("new_instance", Object.class, KlassPointer.class);

    /**

     * @see ResolveConstantStubCall

     */

    public static final ForeignCallDescriptor RESOLVE_STRING_BY_SYMBOL = new ForeignCallDescriptor("resolve_string_by_symbol", Object.class, Word.class, Word.class);

    /**

     * @see ResolveConstantStubCall

     */

    public static final ForeignCallDescriptor RESOLVE_KLASS_BY_SYMBOL = new ForeignCallDescriptor("resolve_klass_by_symbol", Word.class, Word.class, Word.class);

    /**

     * @see ResolveConstantStubCall

     */

    public static final ForeignCallDescriptor INITIALIZE_KLASS_BY_SYMBOL = new ForeignCallDescriptor("initialize_klass_by_symbol", Word.class, Word.class, Word.class);

    /**

     * @see ResolveConstantStubCall

     */

    public static final ForeignCallDescriptor RESOLVE_METHOD_BY_SYMBOL_AND_LOAD_COUNTERS = new ForeignCallDescriptor("resolve_method_by_symbol_and_load_counters", Word.class, Word.class, Word.class,

                    Word.class);

    /**

     * Tiered support.

     */

    public static final ForeignCallDescriptor INVOCATION_EVENT = new ForeignCallDescriptor("invocation_event", void.class, MethodCountersPointer.class);

    public static final ForeignCallDescriptor BACKEDGE_EVENT = new ForeignCallDescriptor("backedge_event", void.class, MethodCountersPointer.class, int.class, int.class);

    public HotSpotBackend(HotSpotGraalRuntimeProvider runtime, HotSpotProviders providers) {

        super(providers);

        this.runtime = runtime;

    }

    public HotSpotGraalRuntimeProvider getRuntime() {

        return runtime;

    }

    /**

     * Performs any remaining initialization that was deferred until the {@linkplain #getRuntime()

     * runtime} object was initialized and this backend was registered with it.

     *

     * @param jvmciRuntime

     * @param options

     */

    public void completeInitialization(HotSpotJVMCIRuntime jvmciRuntime, OptionValues options) {

    }

    /**

     * Finds all the registers that are defined by some given LIR.

     *

     * @param lir the LIR to examine

     * @return the registers that are defined by or used as temps for any instruction in {@code lir}

     */

    protected final EconomicSet<Register> gatherDestroyedCallerRegisters(LIR lir) {

        final EconomicSet<Register> destroyedRegisters = EconomicSet.create(Equivalence.IDENTITY);

        ValueConsumer defConsumer = new ValueConsumer() {

            @Override

            public void visitValue(Value value, OperandMode mode, EnumSet<OperandFlag> flags) {

                if (ValueUtil.isRegister(value)) {

                    final Register reg = ValueUtil.asRegister(value);

                    destroyedRegisters.add(reg);

                }

            }

        };

        for (AbstractBlockBase<?> block : lir.codeEmittingOrder()) {

            if (block == null) {

                continue;

            }

            for (LIRInstruction op : lir.getLIRforBlock(block)) {

                if (op instanceof LabelOp) {

                    // Don't consider this as a definition

                } else {

                    op.visitEachTemp(defConsumer);

                    op.visitEachOutput(defConsumer);

                }

            }

        }

        return translateToCallerRegisters(destroyedRegisters);

    }

    /**

     * Updates a given stub with respect to the registers it destroys.

     * <p>

     * Any entry in {@code calleeSaveInfo} that {@linkplain SaveRegistersOp#supportsRemove()

     * supports} pruning will have {@code destroyedRegisters}

     * {@linkplain SaveRegistersOp#remove(EconomicSet) removed} as these registers are declared as

     * temporaries in the stub's {@linkplain ForeignCallLinkage linkage} (and thus will be saved by

     * the stub's caller).

     *

     * @param stub the stub to update

     * @param destroyedRegisters the registers destroyed by the stub

     * @param calleeSaveInfo a map from debug infos to the operations that provide their

     *            {@linkplain RegisterSaveLayout callee-save information}

     * @param frameMap used to {@linkplain FrameMap#offsetForStackSlot(StackSlot) convert} a virtual

     *            slot to a frame slot index

     */

    protected void updateStub(Stub stub, EconomicSet<Register> destroyedRegisters, EconomicMap<LIRFrameState, SaveRegistersOp> calleeSaveInfo, FrameMap frameMap) {

        stub.initDestroyedCallerRegisters(destroyedRegisters);

        MapCursor<LIRFrameState, SaveRegistersOp> cursor = calleeSaveInfo.getEntries();

        while (cursor.advance()) {

            SaveRegistersOp save = cursor.getValue();

            if (save.supportsRemove()) {

                save.remove(destroyedRegisters);

            }

            if (cursor.getKey() != LIRFrameState.NO_STATE) {

                cursor.getKey().debugInfo().setCalleeSaveInfo(save.getMap(frameMap));

            }

        }

    }

    @Override

    public HotSpotProviders getProviders() {

        return (HotSpotProviders) super.getProviders();

    }

    @Override

    public SuitesProvider getSuites() {

        return getProviders().getSuites();

    }

    protected void profileInstructions(LIR lir, CompilationResultBuilder crb) {

        if (HotSpotBackend.Options.ASMInstructionProfiling.getValue(lir.getOptions()) != null) {

            HotSpotInstructionProfiling.countInstructions(lir, crb.asm);

        }

    }

    @Override

    public CompiledCode createCompiledCode(ResolvedJavaMethod method, CompilationRequest compilationRequest, CompilationResult compResult) {

        HotSpotCompilationRequest compRequest = compilationRequest instanceof HotSpotCompilationRequest ? (HotSpotCompilationRequest) compilationRequest : null;

    }

    @Override

    public CompilationIdentifier getCompilationIdentifier(ResolvedJavaMethod resolvedJavaMethod) {

        if (resolvedJavaMethod instanceof HotSpotResolvedJavaMethod) {

            HotSpotCompilationRequest request = new HotSpotCompilationRequest((HotSpotResolvedJavaMethod) resolvedJavaMethod, JVMCICompiler.INVOCATION_ENTRY_BCI, 0L);

            return new HotSpotCompilationIdentifier(request);

        }

        return super.getCompilationIdentifier(resolvedJavaMethod);

    }

}