http://llvm.org/bugs/show_bug.cgi?id=21789
Bug ID: 21789
Summary: False positive - std::vector<T>::size() won't change
in two subsequent invocations
Product: clang
Version: 3.5
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: Static Analyzer
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Created attachment 13443
--> http://llvm.org/bugs/attachment.cgi?id=13443&action=edit
Tiny testcase to trigger the issue
Using 'Debian clang version 3.5.0-1~exp1 (trunk) (based on LLVM 3.5.0)' on the
attached program will emit a 'running scan-build on the following program will
emit a warning saying
foo.cpp:13:16: warning: Dereference of undefined pointer value
(void)(*x + 1);
It appears this is because the analyzer doesn't see that two subsequent
invocations of std::vector<T>::size() will yield the same value, i.e. if the
second if() was hit then the first one must've been hit as well. I suspect this
could be considered a defect since the compiler most certainly saw the
implementation of size()?
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