Libclang: Get Symbol (e.g. function) at SourceLocation

Question

I want to write a refactor tool, where I want to move the function at the cursor(cursor is in the function name) to the source file.

I found the FunctionMover.cc in https://github.com/lanl/CoARCT which is a good starting point to move the function. However, I cannot find anything how to get the symbol (i.e. in my case function) from a file:line:column (or file:offset) combination. I imagine this should be quite easy with the AST, SourceManager and libtooling of clang, but I cannot find anything about it.

Thanks for any help in advance!

not sure if i understood the question. Are you trying to get the function (functionDecl maybe?) from a clang::SourceLocation ? — Booo
– Booo, Commented Dec 18, 2020 at 8:33
I dont know if clang::SourceLocation the correct term. I have a file:line:column tuple from a different tool and want to get the symbol at that location (could be a functionDecl). — veio
– veio, Commented Dec 18, 2020 at 14:16

Booo · Accepted Answer · 2020-12-18 17:51:53Z

1

+50

I would try LibTooling, clang::SourceManager has a member function translateFileLineCol():

SourceManager& SM = ctx.getSourceManager();
const FileEntry* FE = SM.getFileManager().getFile(filename);
SourceLocation loc = SM.translateFileLineCol(FE, line, column);

after obtaining the loc, you can maybe use SM.getCharacterData() or do other maneuvers.

This post has a very similar purpose, I believe. Seems like there is also a solution with libClang.

edited Dec 18, 2020 at 17:51

answered Dec 18, 2020 at 16:27

Booo

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4 Comments

veio Over a year ago

Thanks, translateFileLineCol() is a nice convenience function, but I guess the tricky part is too get the symbol at that source location. printToString() just prints the file:line:column again. In your linked post, there is also no solution for this part.

Booo Over a year ago

@veio, sorry, i re-edited. does getCharacterData() from sourceManager work?

Booo Over a year ago

having said those, i wonder is doing so really more convenience than creating a for loop to iterate all chars ;)

veio Over a year ago

I think we have a misunderstanding. I know what code is written at the source location (this is easy to get from just reading the file). I want to know which semantic meaning does the text at the cursor have. Is it a function, a variable, a body etc.

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