-Wuninitialized: assume that an __attribute__((returns_twice)) function might
initialize any variable. This is extremely conservative, but is sufficient for
now.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@159620 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Sema/uninit-variables.c b/test/Sema/uninit-variables.c
index 59577b9..71ce76c 100644
--- a/test/Sema/uninit-variables.c
+++ b/test/Sema/uninit-variables.c
@@ -466,3 +466,22 @@
k = produce();
}
}
+
+typedef char jmp_buf[256];
+extern int setjmp(jmp_buf env); // implicitly returns_twice
+
+void do_stuff_and_longjmp(jmp_buf env, int *result) __attribute__((noreturn));
+
+int returns_twice() {
+ int a; // expected-note {{initialize}}
+ if (!a) { // expected-warning {{variable 'a' is uninitialized}}
+ jmp_buf env;
+ int b;
+ if (setjmp(env) == 0) {
+ do_stuff_and_longjmp(env, &b);
+ } else {
+ a = b; // no warning
+ }
+ }
+ return a;
+}