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 * The Universal Permissive License (UPL), Version 1.0
 *
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 * person obtaining a copy of this software, associated documentation and/or
 * data (collectively the "Software"), free of charge and under any and all
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 * unmodified Software as contributed to or provided by such licensor, or (ii)
 * the Larger Works (as defined below), to deal in both
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 * (a) the Software, and
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 * (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
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package com.oracle.truffle.nfi.impl;

import com.oracle.truffle.api.CompilerDirectives.TruffleBoundary;
import com.oracle.truffle.api.TruffleLanguage.ContextReference;
import com.oracle.truffle.api.dsl.Cached;
import com.oracle.truffle.api.dsl.Specialization;
import com.oracle.truffle.api.interop.TruffleObject;
import com.oracle.truffle.api.nodes.Node;
import com.oracle.truffle.nfi.impl.BindSignatureNodeFactory.PointerBindSignatureNodeGen;
import com.oracle.truffle.nfi.impl.BindSignatureNodeFactory.SignatureCacheNodeGen;
import com.oracle.truffle.nfi.impl.TypeConversion.AsStringNode;
import com.oracle.truffle.nfi.impl.TypeConversionFactory.AsStringNodeGen;
import com.oracle.truffle.nfi.types.NativeSignature;
import com.oracle.truffle.nfi.types.Parser;

abstract class BindSignatureNode extends Node {

    abstract TruffleObject execute(TruffleObject receiver, Object signature);

    abstract static class SignatureCacheNode extends Node {

        private final ContextReference ctxRef = NFILanguageImpl.getCurrentContextReference();

        protected abstract LibFFISignature execute(String signature);

        @Specialization(guards = "checkSignature(signature, cachedSignature)")
        @SuppressWarnings("unused")
        protected LibFFISignature cached(String signature,
                        @Cached("signature") String cachedSignature,
                        @Cached("parse(signature)") LibFFISignature ret) {
            return ret;
        }

        @Specialization(replaces = "cached")
        @TruffleBoundary
        protected LibFFISignature parse(String signature) {
            NativeSignature parsed = Parser.parseSignature(signature);
            return LibFFISignature.create(ctxRef.get(), parsed);
        }

        protected static boolean checkSignature(String signature, String cachedSignature) {
            return signature.equals(cachedSignature);
        }
    }

    abstract static class PointerBindSignatureNode extends BindSignatureNode {

        @Child protected SignatureCacheNode signatureCache = SignatureCacheNodeGen.create();
        @Child protected AsStringNode asString = AsStringNodeGen.create(false);

        @Specialization(guards = "checkNull(receiver)")
        TruffleObject doNull(NativePointer receiver, @SuppressWarnings("unused") Object signature) {
            return receiver;
        }

        @Specialization(guards = "!checkNull(receiver)")
        TruffleObject doFunction(NativePointer receiver, Object signature) {
            String sigString = asString.execute(signature);
            LibFFISignature nativeSignature = signatureCache.execute(sigString);
            return new LibFFIFunction(receiver, nativeSignature);
        }

        protected static boolean checkNull(NativePointer pointer) {
            return pointer.nativePointer == 0;
        }
    }

    abstract static class ReBindSignatureNode extends BindSignatureNode {

        @Child protected BindSignatureNode bind = PointerBindSignatureNodeGen.create();

        @Specialization
        TruffleObject rebind(LibFFIFunction function, Object signature) {
            return bind.execute(function.getPointer(), signature);
        }
    }
}