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/*
 * Copyright (c) 2017, 2020, Oracle and/or its affiliates. All rights reserved.
 * 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
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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
 *
 * (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;

import com.oracle.truffle.api.CallTarget;
import com.oracle.truffle.api.Truffle;
import com.oracle.truffle.api.TruffleLanguage;
import com.oracle.truffle.nfi.spi.NFIBackend;

@TruffleLanguage.Registration(id = "nfi", name = "TruffleNFI", version = "0.1", characterMimeTypes = NFILanguage.MIME_TYPE, internal = true)
public class NFILanguage extends TruffleLanguage {

    public static final String MIME_TYPE = "application/x-native";

    @Override
    protected NFIContext createContext(Env env) {
        return new NFIContext(env);
    }

    @Override
    protected boolean patchContext(NFIContext context, Env newEnv) {
        context.patch(newEnv);
        return true;
    }

    @Override
    protected CallTarget parse(ParsingRequest request) throws Exception {
        CharSequence nfiSource = request.getSource().getCharacters();
        NativeSource source = Parser.parseNFISource(nfiSource);

        String backendId;
        if (source.isDefaultBackend()) {
            backendId = "native";
        } else {
            backendId = source.getNFIBackendId();
        }

        NFIBackend backend = getCurrentContext(NFILanguage.class).getBackend(backendId);
        CallTarget loadLibrary = backend.parse(source.getLibraryDescriptor());
        return Truffle.getRuntime().createCallTarget(new NFIRootNode(this, loadLibrary, source));
    }

    @Override
    protected boolean isThreadAccessAllowed(Thread thread, boolean singleThreaded) {
        return true;
    }
}