[analyzer] Suppress false positives in std::shared_ptr
The analyzer does not model C++ temporary destructors completely and so
reports false alarms about leaks of memory allocated by the internals of
shared_ptr:
std::shared_ptr<int> p(new int(1));
p = nullptr; // 'Potential leak of memory pointed to by field __cntrl_'
This patch suppresses all diagnostics where the end of the path is inside
a method in std::shared_ptr.
It also reorganizes the tests for suppressions in the C++ standard library
to use a separate simulated header for library functions with bugs
that were deliberately inserted to test suppression. This will prevent
other tests from using these as models.
rdar://problem/23652766
llvm-svn: 274691
diff --git a/clang/test/Analysis/diagnostics/implicit-cxx-std-suppression.cpp b/clang/test/Analysis/diagnostics/implicit-cxx-std-suppression.cpp
new file mode 100644
index 0000000..143cbbe
--- /dev/null
+++ b/clang/test/Analysis/diagnostics/implicit-cxx-std-suppression.cpp
@@ -0,0 +1,37 @@
+// RUN: %clang_cc1 -analyze -analyzer-checker=core,unix.Malloc,cplusplus.NewDelete,debug.ExprInspection -analyzer-config c++-container-inlining=true -analyzer-config c++-stdlib-inlining=false -std=c++11 -verify %s
+// RUN: %clang_cc1 -analyze -analyzer-checker=core,unix.Malloc,cplusplus.NewDelete,debug.ExprInspection -analyzer-config c++-container-inlining=true -analyzer-config c++-stdlib-inlining=true -std=c++11 -verify %s
+
+// expected-no-diagnostics
+
+#include "../Inputs/system-header-simulator-cxx-std-suppression.h"
+
+void testList_pop_front(std::list<int> list) {
+ while(!list.empty())
+ list.pop_front(); // no-warning
+}
+
+void testBasicStringSuppression() {
+ std::basic_string<uint8_t> v;
+ v.push_back(1); // no-warning
+}
+
+void testBasicStringSuppression_append() {
+ std::basic_string<char32_t> v;
+ v += 'c'; // no-warning
+}
+
+void testBasicStringSuppression_assign(std::basic_string<char32_t> &v,
+ const std::basic_string<char32_t> &v2) {
+ v = v2; // no-warning
+}
+
+class MyEngine;
+void testSuppression_independent_bits_engine(MyEngine& e) {
+ std::__independent_bits_engine<MyEngine, unsigned int> x(e, 64); // no-warning
+}
+
+void testSuppression_std_shared_pointer() {
+ std::shared_ptr<int> p(new int(1));
+
+ p = nullptr; // no-warning
+}