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 * version 2 for more details (a copy is included in the LICENSE file that
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 * 2 along with this work; if not, write to the Free Software Foundation,
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package org.graalvm.compiler.hotspot.aarch64;

import static jdk.vm.ci.aarch64.AArch64.r0;
import static jdk.vm.ci.aarch64.AArch64.r3;
import static jdk.vm.ci.hotspot.HotSpotCallingConventionType.NativeCall;
import static jdk.vm.ci.meta.Value.ILLEGAL;
import static org.graalvm.compiler.hotspot.HotSpotForeignCallLinkage.JUMP_ADDRESS;
import static org.graalvm.compiler.hotspot.HotSpotForeignCallLinkage.RegisterEffect.DESTROYS_ALL_CALLER_SAVE_REGISTERS;
import static org.graalvm.compiler.hotspot.replacements.CRC32CSubstitutions.UPDATE_BYTES_CRC32C;
import static org.graalvm.compiler.hotspot.replacements.CRC32Substitutions.UPDATE_BYTES_CRC32;

import org.graalvm.compiler.core.common.LIRKind;
import org.graalvm.compiler.hotspot.GraalHotSpotVMConfig;
import org.graalvm.compiler.hotspot.HotSpotBackend;
import org.graalvm.compiler.hotspot.HotSpotForeignCallLinkageImpl;
import org.graalvm.compiler.hotspot.HotSpotGraalRuntimeProvider;
import org.graalvm.compiler.hotspot.meta.HotSpotHostForeignCallsProvider;
import org.graalvm.compiler.hotspot.meta.HotSpotProviders;
import org.graalvm.compiler.options.OptionValues;
import org.graalvm.compiler.word.WordTypes;

import jdk.vm.ci.code.CallingConvention;
import jdk.vm.ci.code.CodeCacheProvider;
import jdk.vm.ci.code.RegisterValue;
import jdk.vm.ci.code.TargetDescription;
import jdk.vm.ci.hotspot.HotSpotJVMCIRuntime;
import jdk.vm.ci.meta.MetaAccessProvider;
import jdk.vm.ci.meta.PlatformKind;
import jdk.vm.ci.meta.Value;

public class AArch64HotSpotForeignCallsProvider extends HotSpotHostForeignCallsProvider {

    private final Value[] nativeABICallerSaveRegisters;

    public AArch64HotSpotForeignCallsProvider(HotSpotJVMCIRuntime jvmciRuntime, HotSpotGraalRuntimeProvider runtime, MetaAccessProvider metaAccess, CodeCacheProvider codeCache,
                    WordTypes wordTypes, Value[] nativeABICallerSaveRegisters) {
        super(jvmciRuntime, runtime, metaAccess, codeCache, wordTypes);
        this.nativeABICallerSaveRegisters = nativeABICallerSaveRegisters;
    }

    @Override
    public void initialize(HotSpotProviders providers, OptionValues options) {
        GraalHotSpotVMConfig config = runtime.getVMConfig();
        TargetDescription target = providers.getCodeCache().getTarget();
        PlatformKind word = target.arch.getWordKind();

        // The calling convention for the exception handler stub is (only?) defined in
        // TemplateInterpreterGenerator::generate_throw_exception()
        RegisterValue exception = r0.asValue(LIRKind.reference(word));
        RegisterValue exceptionPc = r3.asValue(LIRKind.value(word));
        CallingConvention exceptionCc = new CallingConvention(0, ILLEGAL, exception, exceptionPc);
        register(new HotSpotForeignCallLinkageImpl(HotSpotBackend.EXCEPTION_HANDLER, 0L, DESTROYS_ALL_CALLER_SAVE_REGISTERS, exceptionCc, null));
        register(new HotSpotForeignCallLinkageImpl(HotSpotBackend.EXCEPTION_HANDLER_IN_CALLER, JUMP_ADDRESS, DESTROYS_ALL_CALLER_SAVE_REGISTERS, exceptionCc,
                        null));

        // These stubs do callee saving
        if (config.useCRC32Intrinsics) {
            registerForeignCall(UPDATE_BYTES_CRC32, config.updateBytesCRC32Stub, NativeCall);
        }
        if (config.useCRC32CIntrinsics) {
            registerForeignCall(UPDATE_BYTES_CRC32C, config.updateBytesCRC32C, NativeCall);
        }

        super.initialize(providers, options);
    }

    @Override
    public Value[] getNativeABICallerSaveRegisters() {
        return nativeABICallerSaveRegisters;
    }

}