如何在clang中爲代碼完成創建虛擬文件

我試圖在clang中爲codecompletion創建虛擬文件。不幸的是，我的應用程序段錯誤。我有以下設置：如何在clang中爲代碼完成創建虛擬文件

auto createVirtualFile = [](
    clang::CompilerInstance& ci, 
    std::string name, 
    llvm::StringRef input 
) { 
    std::unique_ptr<llvm::MemoryBuffer> 
    MB(llvm::MemoryBuffer::getMemBuffer(input, name)); 
    return std::move(MB); 
};

一旦文件被我設置一個CodeCompletConsumer創建：

auto setupCodeComplete = [](
    clang::CompilerInstance& ci, 
    std::string File, 
    int Line, 
    int Column 
) { 
    auto& F = ci.getFrontendOpts(); 
    F.CodeCompletionAt.FileName = File; 
    F.CodeCompletionAt.Line = Line; 
    F.CodeCompletionAt.Column = Column; 
    clang::FrontendInputFile FrontFile(File, clang::IK_CXX); 
    //F.Inputs.push_back(FrontFile); 
    ci.createCodeCompletionConsumer(); 
    return FrontFile; 
};

我調用這兩個函數通過以下方式和執行語法的作用：

auto runCodeCompleteAt = [] (
    clang::CompilerInstance& ci, 
    std::string Filename, 
    std::string Code, 
    int Line, 
    int Column 
) { 
    auto fid = createVirtualFile(ci, Filename, Code); 
    auto File = setupCodeComplete(ci, Filename, Line, Column); 
    clang::SyntaxOnlyAction Act; 
    if (Act.BeginSourceFile(ci, File)) { 
    Act.Execute(); // segfault 
    Act.EndSourceFile(); 
    } 
}; 

auto runExample = [](auto& ci){ 
    runCodeCompleterAt(ci, "test.cpp", "std::cou", 1, 7); 
}

我欣賞任何提示。

來源

2016-05-23 Gaetano

[OT] std :: move in'return std :: move（MB）;'應該被移除。（它只禁止RVO）。 – Jarod42

[OT] MB是一個unique_ptr，我不清楚移動所有權嗎？ – Gaetano

看看[什麼時候應該stdmove被使用的函數返回值]（http://stackoverflow.com/questions/14856344/when-should-stdmove-be-used-on-a - 函數返回值） – Jarod42

問題是雖然您可以將llvm::MemoryBuffer添加到clang::FrontendInputFile,clang::SyntaxOnlyAction不接受這樣的輸入，但會導致斷言失敗。正如我在previous answer中所說的，您可能想要在lib/Frontend/ASTUnit.cpp中查看ASTUnit::CodeComplete。

其實你可以使用remappedFiles到文件名以緩衝鏈接：

int main() 
{ 
    unsigned Line = 2; 
    unsigned Column = 13; 
    clang::CompilerInstance ci; 
    llvm::StringRef codeStr("void MyFoo() {}\nint main() {My return 0}"); 

    // Just a dummy filename, the file even doesnt' exist. 
    std::string Filename("virtualFile.cpp"); 
    std::unique_ptr<llvm::MemoryBuffer> MB(llvm::MemoryBuffer::getMemBuffer(codeStr, Filename)); 

    // Create diagnostics and target 
    ci.createDiagnostics(); 
    std::shared_ptr<clang::TargetOptions> to = std::make_shared<clang::TargetOptions>(); 
    // clang -v 
    //to->Triple = "x86_64-pc-win32"; 
    //to->Triple = "x86_64-apple-darwin"; 
    to->Triple = "x86_64-apple-darwin15"; 
    ci.setTarget(clang::TargetInfo::CreateTargetInfo(ci.getDiagnostics(), to)); 

    // Create language options 
    clang::LangOptions &lo = ci.getLangOpts(); 
    lo.CPlusPlus = true; 
    lo.CPlusPlus11 = true; 

    // Create code complete options 
    clang::CodeCompleteOptions cco; 
    cco.IncludeMacros = 0; 
    cco.IncludeCodePatterns = 1; 
    cco.IncludeGlobals = 1; 
    cco.IncludeBriefComments = 1; 

    // Set up the callback, I will go back to this callback class later 
    auto pCustomCodeCompleteConsumer = new CustomCodeCompleteConsumer(cco); 
    ci.setCodeCompletionConsumer(pCustomCodeCompleteConsumer); 

    // Set up code complete postions & file 
    // Until now I didn't find a way to pass in a string rather than a file name 
    clang::FrontendOptions& frontendOpts = ci.getFrontendOpts(); 
    frontendOpts.CodeCompletionAt.FileName = Filename; 
    frontendOpts.CodeCompletionAt.Line = Line; 
    frontendOpts.CodeCompletionAt.Column = Column; 
    frontendOpts.Inputs.push_back(clang::FrontendInputFile(Filename, clang::InputKind::IK_CXX)); 

    clang::PreprocessorOptions& preprocessorOpts = ci.getPreprocessorOpts(); 
    preprocessorOpts.clearRemappedFiles(); 
    preprocessorOpts.addRemappedFile(Filename, MB.release()); 

    // Execute 
    clang::SyntaxOnlyAction Act; 
    if (Act.BeginSourceFile(ci, ci.getFrontendOpts().Inputs[0])) { 
     Act.Execute(); 
     Act.EndSourceFile(); 
    } 
}

輸出包含COMPLETION: 50 Decl : MyFoo : [#void#]MyFoo()。

我得到這個答案的代碼段

PreprocessorOpts.clearRemappedFiles(); 
    PreprocessorOpts.RetainRemappedFileBuffers = true; 
    for (const auto &RemappedFile : RemappedFiles) { 
    PreprocessorOpts.addRemappedFile(RemappedFile.first, RemappedFile.second); 
    OwnedBuffers.push_back(RemappedFile.second); 
    }

在 ASTUnit::CodeComplete

。

我相信你可能想閱讀AugmentedCodeCompleteConsumer來利用這些完成提示。

來源

2016-05-26 12:23:09

如何在clang中爲代碼完成創建虛擬文件

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