[analyzer] Suppress reports coming from std::__independent_bits_engine
The analyzer reports a shift by a negative value in the constructor. The bug can
be easily triggered by calling std::random_shuffle on a vector
(<rdar://problem/19658126>).
(The shift by a negative value is reported because __w0_ gets constrained to
63 by the conditions along the path:__w0_ < _WDt && __w0_ >= _WDt-1,
where _WDt is 64. In normal execution, __w0_ is not 63, it is 1 and there is
no overflow. The path is infeasible, but the analyzer does not know about that.)
llvm-svn: 256886
diff --git a/clang/test/Analysis/Inputs/system-header-simulator-cxx.h b/clang/test/Analysis/Inputs/system-header-simulator-cxx.h
index 3586921..f9049c3 100644
--- a/clang/test/Analysis/Inputs/system-header-simulator-cxx.h
+++ b/clang/test/Analysis/Inputs/system-header-simulator-cxx.h
@@ -198,6 +198,25 @@
storage.assignExternal(new _CharT[4]);
}
};
+
+template<class _Engine, class _UIntType>
+class __independent_bits_engine {
+public:
+ // constructors and seeding functions
+ __independent_bits_engine(_Engine& __e, size_t __w);
+};
+
+template<class _Engine, class _UIntType>
+__independent_bits_engine<_Engine, _UIntType>
+ ::__independent_bits_engine(_Engine& __e, size_t __w)
+{
+ // Fake error trigger.
+ // No warning is expected as we are suppressing warning coming
+ // out of std::basic_string.
+ int z = 0;
+ z = 5/z;
+}
+
}
void* operator new(std::size_t, const std::nothrow_t&) throw();
diff --git a/clang/test/Analysis/inlining/stl.cpp b/clang/test/Analysis/inlining/stl.cpp
index 711c30f..2a8520f 100644
--- a/clang/test/Analysis/inlining/stl.cpp
+++ b/clang/test/Analysis/inlining/stl.cpp
@@ -47,3 +47,8 @@
const std::basic_string<char32_t> &v2) {
v = v2;
}
+
+class MyEngine;
+void testSupprerssion_independent_bits_engine(MyEngine& e) {
+ std::__independent_bits_engine<MyEngine, unsigned int> x(e, 64); // no-warning
+}