[analyzer] Teach trackNullOrUndef to look through ternary operators

Allows the suppression visitors trigger more often.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@177137 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 36 insertions, 0 deletions

diff --git a/test/Analysis/inlining/false-positive-suppression.c b/test/Analysis/inlining/false-positive-suppression.c
index bed64f1837..fbdb1650ff 100644
--- a/test/Analysis/inlining/false-positive-suppression.c
+++ b/test/Analysis/inlining/false-positive-suppression.c
@@ -191,3 +191,39 @@ void testAlwaysReturnNull(void *input) {
 #endif
 }
 
+int derefArg(int *p) {
+	return *p;
+#ifndef SUPPRESSED
+  // expected-warning@-2 {{Dereference of null pointer}}
+#endif
+}
+void ternaryArg(char cond) {
+	static int x;
+	derefArg(cond ? &x : getNull());
+}
+
+int derefAssignment(int *p) {
+	return *p;
+#ifndef SUPPRESSED
+  // expected-warning@-2 {{Dereference of null pointer}}
+#endif
+}
+void ternaryAssignment(char cond) {
+  static int x;
+  int *p = cond ? &x : getNull();
+  derefAssignment(p);
+}
+
+int *retNull(char cond) {
+  static int x;
+  return cond ? &x : getNull();
+}
+int ternaryRetNull(char cond) {
+  int *p = retNull(cond);
+  return *p;
+#ifndef SUPPRESSED
+  // expected-warning@-2 {{Dereference of null pointer}}
+#endif
+}
+
+