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      1 // RUN: %clang_cc1 -fsyntax-only -Wuninitialized -fsyntax-only -fcxx-exceptions %s -verify
      2 
      3 // Stub out types for 'typeid' to work.
      4 namespace std { class type_info {}; }
      5 
      6 int test1_aux(int &x);
      7 int test1() {
      8   int x;
      9   test1_aux(x);
     10   return x; // no-warning
     11 }
     12 
     13 int test2_aux() {
     14   int x;
     15   int &y = x;
     16   return x; // no-warning
     17 }
     18 
     19 // Don't warn on unevaluated contexts.
     20 void unevaluated_tests() {
     21   int x;
     22   (void)sizeof(x);
     23   (void)typeid(x);
     24 }
     25 
     26 // Warn for glvalue arguments to typeid whose type is polymorphic.
     27 struct A { virtual ~A() {} };
     28 void polymorphic_test() {
     29   A *a; // expected-note{{declared here}} expected-note{{add initialization}}
     30   (void)typeid(*a); // expected-warning{{variable 'a' is uninitialized when used here }}
     31 }
     32 
     33 // Handle cases where the CFG may constant fold some branches, thus
     34 // mitigating the need for some path-sensitivity in the analysis.
     35 unsigned test3_aux();
     36 unsigned test3() {
     37   unsigned x = 0;
     38   const bool flag = true;
     39   if (flag && (x = test3_aux()) == 0) {
     40     return x;
     41   }
     42   return x;
     43 }
     44 unsigned test3_b() {
     45   unsigned x ;
     46   const bool flag = true;
     47   if (flag && (x = test3_aux()) == 0) {
     48     x = 1;
     49   }
     50   return x; // no-warning
     51 }
     52 unsigned test3_c() {
     53   unsigned x; // expected-note{{declared here}} expected-note{{add initialization}}
     54   const bool flag = false;
     55   if (flag && (x = test3_aux()) == 0) {
     56     x = 1;
     57   }
     58   return x; // expected-warning{{variable 'x' is uninitialized when used here}}
     59 }
     60 
     61 enum test4_A {
     62  test4_A_a, test_4_A_b
     63 };
     64 test4_A test4() {
     65  test4_A a; // expected-note{{variable 'a' is declared here}}
     66  return a; // expected-warning{{variable 'a' is uninitialized when used here}}
     67 }
     68 
     69 // This test previously crashed Sema.
     70 class Rdar9188004A {
     71 public:
     72   virtual ~Rdar9188004A();
     73 };
     74 
     75 template< typename T > class Rdar9188004B : public Rdar9188004A {
     76 virtual double *foo(Rdar9188004B *next) const  {
     77     double *values = next->foo(0);
     78     try {
     79     }
     80     catch(double e) {
     81       values[0] = e;
     82     }
     83     return 0;
     84   }
     85 };
     86 class Rdar9188004C : public Rdar9188004B<Rdar9188004A> {
     87   virtual void bar(void) const;
     88 };
     89 void Rdar9188004C::bar(void) const {}
     90 
     91 // Don't warn about uninitialized variables in unreachable code.
     92 void PR9625() {
     93   if (false) {
     94     int x;
     95     (void)static_cast<float>(x); // no-warning
     96   }
     97 }
     98 
     99 // Don't warn about variables declared in "catch"
    100 void RDar9251392_bar(const char *msg);
    101 
    102 void RDar9251392() {
    103   try {
    104     throw "hi";
    105   }
    106   catch (const char* msg) {
    107     RDar9251392_bar(msg); // no-warning
    108   }
    109 }
    110 
    111 
    112