[cfe-dev] Analyser - variadic arguments

[Artem Dergachev via cfe-dev]

Hello Michael,

You can obtain the total number of arguments passed to the call either 
from the AST (the CallExpr object represents a particular call 
expression, and contains information about number of arguments in this 
expression), or from the path-sensitive CallEvent structure. The method 
you're looking for is called getNumArgs() in both cases. CallEvent also 
contains values of all arguments, which may be concrete (known numbers, 
even if they are variables in the AST) or symbolic (if even the 
path-sensitive engine cannot determine theirl concrete values).

You can then see the function declaration in the AST (CallEvent's 
getDecl() method, which is slightly more accurate than CallExpr's 
getDirectCallee(), because it accounts for calling functions through 
pointers or calling virtual functions whenever the path-sensitive engine 
can help with that), and see which parameters it takes, and how many of 
them are non-variadic, and substract.