[cfe-commits] r145575 - in /cfe/trunk: lib/StaticAnalyzer/Core/ExprEngine.cpp test/Analysis/misc-ps-region-store.cpp

Richard Smith richard at metafoo.co.uk
Sun Dec 11 13:53:39 CST 2011

On Sun, December 11, 2011 08:15, Jonathan Sauer wrote:
>> Hi, Ted. Just wanted to note that it's technically legal for 'this' to be
>> null if the method is non-virtual, which I'm sure you know already. Maybe
>> someday we can make this a setting?
> I'm not so sure about that. After all, when calling the method as in
> "obj->method()", you dereference the pointer. And
> dereferencing a NULL pointer results in undefined behaviour.

That is a controversial position. My understanding is that the intent of the
committee is that dereferencing a null pointer is not undefined behaviour; an
lvalue-to-rvalue conversion on the result is, as is binding a reference to
such a value.

> C.f. this thread:
> <http://groups.google.com/group/comp.lang.c++.moderated/browse_thread/thread/
> 348cc1eeef92033d>

The relevant quotation there seems to be from [class.memfct.non-static]p1. The
standard only provides permission to call member functions only on pointers to
an object of the relevant type (or a type derived from it).

- Richard

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