[cfe-dev] CodeCompletion for C++ Code in Buffers

[Kevin Funk]

On Sunday, April 05, 2015 03:30:12 AM fmclang wrote:
> David Chisnall-4 wrote
> 
> > You can just specify a name ("
> > <unsaved file>
> > " or similar) and it will work fine.
> 
> Hi David,
> 
> thanks for your reply.
> I already tried that with no success.
> My test is a simple sequence of
> clang_createIndex, clang_parseTranslationUnit and clang_codeCompleteAt.
> 
> 
> -----------------------------------------------
> 
> const char* tmpCpp =
> "struct MyStruct { void myFunc(int i); };\r\n"
> "int main()\r\n"
> "{\r\n"
> "   MyStruct s;\r\n"
> "   s.\r\n";
> 
> #define SRC_FILE "<unsaved_file>"
> 
> int main()
> {
>     CXIndex idx = clang_createIndex(1, 0);
>     CXUnsavedFile* uf = new CXUnsavedFile[1];
>     uf[0].Filename = SRC_FILE;
>     uf[0].Contents = tmpCpp;
>     uf[0].Length = strlen(tmpCpp);
> 
>     CXTranslationUnit u = clang_parseTranslationUnit(idx, SRC_FILE, nullptr,
> 0, uf, 1, 0);
>     CXCodeCompleteResults* res = clang_codeCompleteAt(u, SRC_FILE, 5, 6, uf,
> 1, clang_defaultCodeCompleteOptions());
> }
> 
> -----------------------------------------------
> 
> 
> If i define SRC_FILE to a real file of whatever content, everything works
> fine.
> But if the file does not exist, clang crashes in
> 
> clang_parseTranslationUnit_Impl()
> 
> at this line:
> 
> if (isASTReadError(Unit ? Unit.get() : ErrUnit.get())) <--------------
> 
> 
> The problem is that both Unit and ErrUnit are nulltr and there is no
> further check in isASTReadError() for nullptr. Is this a bug i did i make
> something wrong?

Your code looks fine to me.

I've reported a bug report about this issue a while ago already:
  https://llvm.org/bugs/show_bug.cgi?id=22282

We've seen the same issue in KDevelop.

> 
> 
> Cheers
> 
> 
> 
> 
> 
> 
> --
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-- 
Kevin Funk | kfunk at kde.org | http://kfunk.org
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