[Analyzer] Checker for non-determinism caused by iteration of unordered container of pointers

Summary: Added a checker for non-determinism caused by iterating unordered containers like std::unordered_set containing pointer elements.

Reviewers: NoQ, george.karpenkov, whisperity, Szelethus, baloghadamsoftware

Reviewed By: Szelethus

Subscribers: mgorny, xazax.hun, baloghadamsoftware, szepet, rnkovacs, a.sidorin, mikhail.ramalho, donat.nagy, dkrupp, jdoerfert, Charusso, cfe-commits

Tags: #clang

Differential Revision: https://reviews.llvm.org/D59279

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@361664 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 16 insertions, 2 deletions

diff --git a/docs/analyzer/checkers.rst b/docs/analyzer/checkers.rst
index b13d4d04d4..6a266eb1d9 100644
--- a/docs/analyzer/checkers.rst
+++ b/docs/analyzer/checkers.rst
@@ -211,8 +211,8 @@ Check for uninitialized values being returned to the caller.
 .. _cplusplus-checkers:
 
 
-cpluslus
-^^^^^^^^
+cplusplus
+^^^^^^^^^
 
 C++ Checkers.
 
@@ -1951,6 +1951,20 @@ Check for out-of-bounds access in string functions; applies to:`` strncopy, strn
    int y = strlen((char *)&test); // warn
  }
 
+alpha.nondeterminism.PointerIteration (C++)
+"""""""""""""""""""""""""""""""""""""""""""
+Check for non-determinism caused by iterating unordered containers of pointers.
+
+.. code-block:: c
+
+ void test() {
+  int a = 1, b = 2;
+  std::unordered_set<int *> UnorderedPtrSet = {&a, &b};
+
+  for (auto i : UnorderedPtrSet) // warn
+    f(i);
+ }
+
 alpha.nondeterminism.PointerSorting (C++)
 """""""""""""""""""""""""""""""""""""""""
 Check for non-determinism caused by sorting of pointers.