clang/test/SemaCXX/warn-missing-noreturn.cpp

   1 // RUN: %clang_cc1 -fsyntax-only -verify %s -Wmissing-noreturn -Wreturn-type
   2 void f() __attribute__((noreturn));
   3
   4 template<typename T> void g(T) {
   5   f();
   6 }
   7
   8 template void g<int>(int);
   9
  10 template<typename T> struct A {
  11   void g() {
  12     f();
  13   }
  14 };
  15
  16 template struct A<int>;
  17
  18 struct B {
  19   template<typename T> void g(T) {
  20     f();
  21   }
  22 };
  23
  24 template void B::g<int>(int);
  25
  26 // We don't want a warning here.
  27 struct X {
  28   virtual void g() { f(); }
  29 };
  30
  31 namespace test1 {
  32   bool condition();
  33
  34   // We don't want a warning here.
  35   void foo() {
  36     while (condition()) {}
  37   }
  38 }
  39
  40
  41 // <rdar://problem/7880658> - This test case previously had a false "missing return"
  42 // warning.
  43 struct R7880658 {
  44   R7880658 &operator++();
  45   bool operator==(const R7880658 &) const;
  46   bool operator!=(const R7880658 &) const;
  47 };
  48
  49 void f_R7880658(R7880658 f, R7880658 l) {  // no-warning
  50   for (; f != l; ++f) {
  51   }
  52 }
  53
  54 namespace test2 {
  55
  56   bool g();
  57   void *h() __attribute__((noreturn));
  58   void *j();
  59
  60   struct A {
  61     void *f;
  62
  63     A() : f(0) { }
  64     A(int) : f(h()) { } // expected-warning {{function 'A' could be declared with attribute 'noreturn'}}
  65     A(char) : f(j()) { }
  66     A(bool b) : f(b ? h() : j()) { }
  67   };
  68 }
  69
  70 namespace test3 {
  71   struct A {
  72     ~A();
  73   };
  74
  75   struct B {
  76     ~B() { }
  77
  78     A a;
  79   };
  80
  81   struct C : A {
  82     ~C() { }
  83   };
  84 }
  85
  86 // <rdar://problem/8875247> - Properly handle CFGs with destructors.
  87 struct rdar8875247 {
  88   ~rdar8875247 ();
  89 };
  90 void rdar8875247_aux();
  91
  92 int rdar8875247_test() {
  93   rdar8875247 f;
  94 } // expected-warning{{non-void function does not return a value}}
  95
  96 struct rdar8875247_B {
  97   rdar8875247_B();
  98   ~rdar8875247_B();
  99 };
 100
 101 rdar8875247_B test_rdar8875247_B() {
 102   rdar8875247_B f;
 103   return f;
 104 } // no-warning
 105
 106 namespace PR10801 {
 107   struct Foo {
 108     void wibble() __attribute((__noreturn__));
 109   };
 110
 111   struct Bar {
 112     void wibble();
 113   };
 114
 115   template <typename T> void thingy(T thing) {
 116     thing.wibble();
 117   }
 118
 119   void test() {
 120     Foo f;
 121     Bar b;
 122     thingy(f);
 123     thingy(b);
 124   }
 125 }