[cfe-dev] usage of clang in an university project
clattner at apple.com
Sun Oct 7 11:41:52 PDT 2007
On Oct 7, 2007, at 11:29 AM, Nuno Lopes wrote:
> Thank you for your fast answer.
> Today I was reading the clang code and I'm now trying to implement
> an ASTConsumer, as I'll have to do a little more analysis that just
> checking function calls. I also need to know when a particular
> variable used in the function call is initialized or not as well as
> if it is not initialized by the function call (through a pointer)
> whether it is used afterwards or not. I still didn't know if this
> will be simple enough to do, but I'll try..
Ok, the dataflow framework Ted is working on will be useful to you.
We don't really support interprocedural analysis yet though.
> For now, I have just more two questions:
> - is it possible to disable clang warnings and output just the
> warnings I'll be generating? (I added a -parse-ast-sirs opt for me)
Yes. The Diagnostic class handles mapping of warnings and other
diagnostics to error levels.
Just call Diagnostics->setDiagnosticMapping(somediag,
diag::MAP_IGNORE); to ignore somediag.
> - can clang ignore parsing errors? e.g. if it can't find an
> header.h file can it continue even if a function is called without
> being declared.
No, not in full generality. In C you need information about types to
be able to parse, for example.
> This is especially useful in my case because I'll be parsing the
> PHP sources (in C) and I don't have all the external libraries that
> some PHP extensions rely on, but I still would like to be able to
> analyse those extensions, though.
You may have some luck, but in general it won't work well.
> BTW, in attach you'll find a backtrace I got when doing executing
> 'clang -parse-ast-*'. It happens when I parse a PHP source file and
> when not all include (-I) paths are specified. I took a quick look
> at those functions, but I couldn't fix the bug myself.
Please create a .i file with clang and send that in: clang
whatever.c -E > output.i
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