[cfe-dev] Adding new pragma to call statements in C++

[Raj Barik]

Hi,

I am trying to add a new #pragma for certain call-sites of a C/C++ program.
For example,

#pragma markme
a = foo(1, 2);

I have been able extend clang to add a pragma handler that has a callback
on the Sema actions. That's the easy part.
In Sema action implementation, I want to ensure that this indeed is a call
statement. So,

1) Is there is any boilerplate code (or guidelines) to ensure that the
"pragma" following statement is indeed a call statement.

2)  What would be an efficient way to carry extra information from this
Sema action implementation to the CodeGen for this call
statement/expression (ie, CGStmt.cpp)? I would like to carry more
information than just a flag. It seems a waste to add an extra pointer to
Stmt class for this.

3) I understand that CGStmt.cpp is the top level code generator for
statements. Any clue on what path (or function) is taken for a call-site
expression? I need this to emit extra code related to the my pragma.

(Note, this is my first time hacking on clang! Thanks!)

Thanks,
Raj
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