[cfe-dev] Missing ReturnStmt?

[Anna Zaks]

On Feb 6, 2012, at 1:55 AM, Zong wrote:

>  Dear All,
> 
> I have a very simple clang analyzer checker code snippet like below,
> 
> --------------------------------------------------
> using namespace clang;
> using namespace ento;
> 
> namespace {
>   class myChecker: public Checker< check::PreStmt<Stmt> >  {
>   public:
>     void checkPreStmt(const Stmt *S, CheckerContext &Ctx) const ;
> 
>   };
> }
> 
> void myChecker::checkPreStmt(const Stmt *S, CheckerContext &Ctx) const {
>    S->dumpAll();
> }
> --------------------------------------------------
> 
> This analyzer was then fed with the test code:
> 
> int main()
> {
>   int *b;
>   int *c;
>   *c=b;
>    return 0;
> }
> 
> Why can't I observe a "ReturnStmt"? 
> If I change "*c=b" with something other (e.g., b=c), then "ReturnStmt" appears.  I just can! 't figure out the reason. Would someone please help me ? Thanks!
> 

What is the command line you use to execute this? 

Could it be because '*c=b' causes "Dereference of undefined pointer value" error (in another checker)? Most analyzer errors are defined as sinks - it means that we stop analyzing the path after such error is caught. (This example also produces a compiler warning - you are casting 'int *' to 'int'.)

Anna.

> Best,
> Z
> 
> 
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> cfe-dev at cs.uiuc.edu
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