[cfe-dev] Question about usage of Python bindings to clang

[Russell Keith-Magee via cfe-dev]

Hi Jonathan,

Thanks - that looks similar to what I’ve already got:

https://github.com/pybee/seasnake

The problem I’m hitting isn’t with the method declarations - those are
pretty easy to sort out. My problem is with the contents of the
COMPOUND_STMT type, which is the body of the methods, and the CALL_EXPR
node type in particular.

Yours,
Russ Magee %-)



On Thu, Jan 21, 2016 at 8:28 AM, Jonathan Coe <jbcoe at me.com> wrote:

> I have worked on an early-stage python c++ code model which is built on
> top of the libclang python API.
>
> https://github.com/jbcoe/clang_cpp_code_model
>
> The code-model is good enough to drive simple code generators and makes it
> simple to extract a lot of AST info. It is incomplete.
>
> I don't know what you're trying to do, but maybe the code-model above
> could be useful.
>
> regards,
>
> Jon
>
> On 20 January 2016 at 14:11, Russell Keith-Magee via cfe-dev <
> cfe-dev at lists.llvm.org> wrote:
>
>> Hi all,
>>
>> I’ve got some questions about the data returned by the Python bindings to
>> clang.
>>
>> When clang is invoked with “-Xclang -ast-dump -fsyntax-only” to dump the
>> AST for a source file, the output of clang appears to provide much richer
>> output than the Python bindings exposes. I’m guessing this is because the
>> relevant details are deeply embedded in the cursor object returned by the
>> Python API, but I’m not sure where I should be looking for this extra
>> detail.
>>
>> In particular, when clang returns a CXXConstructExpr, the Python API
>> returns CursorKind.CALL_EXPR, which is the same node type returned by a
>> normal function call - so it isn’t possible to differentiate a normal
>> method call from a constructor.
>>
>> Similarly, when clang returns a MaterializeTemporaryExpr or
>> ImplicitCastExpr, the Python API returns a CursorKind.UNEXPOSED_EXPR.
>>
>> How do you interrogate the Python API to determine the richer node types
>> that clang is returning?
>>
>> If it helps, I’ve posted full example code and output in a gist:
>>
>> https://gist.github.com/freakboy3742/5826ef09789dfba9042e
>>
>> This contains three files:
>>
>>  * a sample.cpp file with a simple class, and a function using that class
>>
>>  * An AST dump of the file provided by clang
>>
>>  * The AST produced by the Python bindings, generated by walking the
>> tree, printing the node kind, type, return type and spelling, and then
>> doing the same for each child.
>>
>> Yours,
>> Russ Magee %-)
>>
>> _______________________________________________
>> cfe-dev mailing list
>> cfe-dev at lists.llvm.org
>> http://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-dev
>>
>>
>
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