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 * 1. Redistributions of source code must retain the above copyright notice, this list of
 * conditions and the following disclaimer.
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 * 2. Redistributions in binary form must reproduce the above copyright notice, this list of
 * conditions and the following disclaimer in the documentation and/or other materials provided
 * with the distribution.
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 * 3. Neither the name of the copyright holder nor the names of its contributors may be used to
 * endorse or promote products derived from this software without specific prior written
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS
 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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package com.oracle.truffle.llvm.initialization;

import com.oracle.truffle.api.CallTarget;
import com.oracle.truffle.api.CompilerDirectives;
import com.oracle.truffle.api.CompilerDirectives.CompilationFinal;
import com.oracle.truffle.api.CompilerDirectives.TruffleBoundary;
import com.oracle.truffle.api.TruffleFile;
import com.oracle.truffle.api.TruffleLanguage.ContextReference;
import com.oracle.truffle.api.frame.FrameDescriptor;
import com.oracle.truffle.api.frame.VirtualFrame;
import com.oracle.truffle.api.nodes.RootNode;
import com.oracle.truffle.llvm.runtime.LLVMContext;
import com.oracle.truffle.llvm.runtime.LLVMLanguage;
import com.oracle.truffle.llvm.runtime.NativeContextExtension;
import com.oracle.truffle.llvm.runtime.except.LLVMParserException;

public final class LoadNativeNode extends RootNode {

    private final String path;
    @CompilationFinal private ContextReference<LLVMContext> ctxRef;

    private LoadNativeNode(FrameDescriptor rootFrame, LLVMLanguage language, TruffleFile file) {
        super(language, rootFrame);
        this.path = file.getPath();
    }

    public static LoadNativeNode create(FrameDescriptor rootFrame, LLVMLanguage language, TruffleFile file) {
        return new LoadNativeNode(rootFrame, language, file);
    }

    @Override
    public Object execute(VirtualFrame frame) {
        if (ctxRef == null) {
            CompilerDirectives.transferToInterpreterAndInvalidate();
            this.ctxRef = lookupContextReference(LLVMLanguage.class);
        }

        LoadModulesNode.LLVMLoadingPhase phase;
        if (frame.getArguments().length > 0 && (frame.getArguments()[0] instanceof LoadModulesNode.LLVMLoadingPhase)) {
            phase = (LoadModulesNode.LLVMLoadingPhase) frame.getArguments()[0];
        } else if (frame.getArguments().length == 0) {
            throw new LLVMParserException(this, "Toplevel executable %s does not contain bitcode", path);
        } else {
            throw new LLVMParserException(this, "LoadNativeNode is called either with unexpected arguments or as a toplevel");
        }

        if (LoadModulesNode.LLVMLoadingPhase.INIT_SYMBOLS.isActive(phase)) {
            LLVMContext context = ctxRef.get();
            parseAndInitialiseNativeLib(context);
        }
        return null;
    }

    @TruffleBoundary
    private void parseAndInitialiseNativeLib(LLVMContext context) {
        NativeContextExtension nativeContextExtension = context.getContextExtensionOrNull(NativeContextExtension.class);
        if (nativeContextExtension != null) {
            CallTarget callTarget = nativeContextExtension.parseNativeLibrary(path, context);
            nativeContextExtension.addLibraryHandles(callTarget.call());
        }
    }
}