Merge branch 'master' of ssh://bitbucket.org/czan/honours

1 files changed, 34 insertions, 0 deletions

diff --git a/clang/test/Analysis/idempotent-operations.cpp b/clang/test/Analysis/idempotent-operations.cpp
new file mode 100644
index 0000000..51b5905
--- /dev/null
+++ b/clang/test/Analysis/idempotent-operations.cpp
@@ -0,0 +1,34 @@
+// RUN: %clang_cc1 -analyze -analyzer-store=region -analyzer-constraints=range -fblocks -analyzer-opt-analyze-nested-blocks -analyzer-checker=experimental.deadcode.IdempotentOperations -verify %s
+
+// C++ specific false positives
+
+extern void test(int i);
+extern void test_ref(int &i);
+
+// Test references affecting pseudoconstants
+void false1() {
+  int a = 0;
+  int five = 5;
+  int &b = a;
+   test(five * a); // expected-warning {{The right operand to '*' is always 0}}
+   b = 4;
+}
+
+// Test not flagging idempotent operations because we aborted the analysis
+// of a path because of an unsupported construct.
+struct RDar9219143_Foo {
+  ~RDar9219143_Foo();
+  operator bool() const;
+};
+
+RDar9219143_Foo foo();
+unsigned RDar9219143_bar();
+void RDar9219143_test() {
+  unsigned i, e;
+  for (i = 0, e = RDar9219143_bar(); i != e; ++i)
+    if (foo())
+      break;  
+  if (i == e) // no-warning
+    return;
+}
+