如何在clang中为codecompletion创建一个虚拟文件
我试图在clang中为codecompletion创建虚拟文件。 不幸的是，我的应用程序段错误。 我有以下设置：
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);
};
一旦文件被创建，我设置一个CodeCompletConsumer：
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;
};
我按照以下方式调用这两个函数并执行只有语法的操作：
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);
}
我很欣赏任何提示。
问题是虽然你可以将llvm::MemoryBuffer添加到clang::FrontendInputFile ，但clang::SyntaxOnlyAction不接受这样的输入，它会导致断言失败。 正如我在前面的回答中所说的，您可能想要查看lib/Frontend/ASTUnit.cpp ASTUnit::CodeComplete 。
实际上，您可以使用remappedFiles将文件名与缓冲区链接起来：
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();
}
}
输出包含COMPLETION: 50 Decl : MyFoo : [#void#]MyFoo() 。
我从代码段得到了这个答案
PreprocessorOpts.clearRemappedFiles();
PreprocessorOpts.RetainRemappedFileBuffers = true;
for (const auto &RemappedFile : RemappedFiles) {
PreprocessorOpts.addRemappedFile(RemappedFile.first, RemappedFile.second);
OwnedBuffers.push_back(RemappedFile.second);
}
在ASTUnit::CodeComplete 。
我相信你可能想阅读AugmentedCodeCompleteConsumer来利用这些完成提示。
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