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/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * The Universal Permissive License (UPL), Version 1.0
 *
 * Subject to the condition set forth below, permission is hereby granted to any
 * person obtaining a copy of this software, associated documentation and/or
 * data (collectively the "Software"), free of charge and under any and all
 * copyright rights in the Software, and any and all patent rights owned or
 * freely licensable by each licensor hereunder covering either (i) the
 * unmodified Software as contributed to or provided by such licensor, or (ii)
 * the Larger Works (as defined below), to deal in both
 *
 * (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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 * Software and the Larger Work(s), and to sublicense the foregoing rights on
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 * The above copyright notice and either this complete permission notice or at a
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package com.oracle.truffle.nfi.impl;

import com.oracle.truffle.api.CompilerDirectives;
import com.oracle.truffle.api.CompilerDirectives.CompilationFinal;
import com.oracle.truffle.api.TruffleLanguage.LanguageReference;
import com.oracle.truffle.api.nodes.Node;
import java.nio.ByteBuffer;

abstract class ClosureArgumentNode extends Node {

    public abstract Object execute(Object arg);

    static class BufferClosureArgumentNode extends ClosureArgumentNode {

        private final LibFFIType type;
        @Child NativeArgumentLibrary nativeArguments;

        BufferClosureArgumentNode(LibFFIType type) {
            this.type = type;
            this.nativeArguments = NativeArgumentLibrary.getFactory().create(type);
        }

        @Override
        public Object execute(Object arg) {
            NativeArgumentBuffer buffer = new NativeArgumentBuffer.Direct((ByteBuffer) arg, 0);
            return nativeArguments.deserialize(type, buffer);
        }
    }

    static class ObjectClosureArgumentNode extends ClosureArgumentNode {

        @CompilationFinal LanguageReference langRef;

        @Override
        public Object execute(Object arg) {
            if (arg == null) {
                if (langRef == null) {
                    CompilerDirectives.transferToInterpreterAndInvalidate();
                    langRef = lookupLanguageReference(NFILanguageImpl.class);
                }
                return NativePointer.create(langRef.get(), 0);
            } else {
                return arg;
            }
        }
    }

    static class StringClosureArgumentNode extends ClosureArgumentNode {

        @Override
        public Object execute(Object arg) {
            if (arg == null) {
                return new NativeString(0);
            } else {
                return arg;
            }
        }
    }
}