[LLVMbugs] [Bug 18209] New: Interprocedural analysis false positive: throwing exception ignored

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=18209

            Bug ID: 18209
           Summary: Interprocedural analysis false positive: throwing
                    exception ignored
           Product: clang
           Version: unspecified
          Hardware: Macintosh
                OS: MacOS X
            Status: NEW
          Severity: normal
          Priority: P
         Component: Static Analyzer
          Assignee: kremenek at apple.com
          Reporter: timac at timac.org
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Created attachment 11702
  --> http://llvm.org/bugs/attachment.cgi?id=11702&action=edit
Xcode 5 project

Summary: The Static Analyzer fails to detect exception thrown in a function and
generates false positives.


Steps to reproduce:

1- Download the attached Xcode 5 project 'ThrowExceptionStaticAnalyzer' and
open it in Xcode 5.
2- Run the 'Analyze' command

Result: You get a false positive warning "warning: Called C++ object pointer is
null"



More info:

- In a separate .cpp file you have a static function that always throws an
exception:
void MyException::Throw() { throw "My Exception"; }

- In your main.cpp file you have the following lines:
void *myPointer = NULL;
if(myPointer == NULL) MyException::Throw();
myPointer->Function();

The interprocedural analyzer fails to detect that MyException::Throw() always
throws an exception.

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