clang/test/CodeGenCXX/nullptr.cpp

   1 // RUN: %clang_cc1 -std=c++11 -triple x86_64-apple-darwin10 -I%S -emit-llvm -o - %s | FileCheck %s
   2
   3 #include <typeinfo>
   4
   5 // CHECK: @_ZTIDn = external constant ptr
   6 int* a = nullptr;
   7
   8 void f() {
   9   int* a = nullptr;
  10 }
  11
  12 typedef decltype(nullptr) nullptr_t;
  13
  14 nullptr_t get_nullptr();
  15
  16 struct X { };
  17 void g() {
  18   // CHECK: call ptr @_Z11get_nullptrv()
  19   int (X::*pmf)(int) = get_nullptr();
  20 }
  21
  22 const std::type_info& f2() {
  23   return typeid(nullptr_t);
  24 }
  25
  26 union U {
  27   int n;
  28   nullptr_t b;
  29 };
  30 // CHECK-LABEL: define {{.*}}pr23833_a
  31 // CHECK: store
  32 // CHECK: load
  33 // CHECK-NOT: load
  34 // CHECK: ret i1 false
  35 bool pr23833_a(U &u) { return bool(u.b); }
  36
  37 // CHECK-LABEL: define {{.*}}pr23833_b
  38 // CHECK: store
  39 // CHECK: load
  40 // CHECK-NOT: load
  41 // CHECK: ret ptr null
  42 nullptr_t pr23833_b(nullptr_t &n) { return n; }
  43
  44 struct X1 { operator int*(); };
  45 struct X2 { operator const nullptr_t&(); };
  46
  47 // CHECK-LABEL: define {{.*}}pr23833_c
  48 // CHECK: call {{.*}}X1
  49 // CHECK: call {{.*}}X2
  50 // CHECK-NOT: load
  51 // CHECK: ret i32
  52 int pr23833_c() {
  53   return X1() != X2();
  54 }
  55
  56 // CHECK-LABEL: define {{.*}}pr23833_d
  57 // CHECK: call {{.*}}X2
  58 // CHECK-NOT: load
  59 // CHECK: store
  60 // CHECK: load
  61 // CHECK: ret ptr
  62 int *pr23833_d() {
  63   int *p = X2();
  64   return p;
  65 }
  66
  67 namespace PR39528 {
  68   constexpr nullptr_t null = nullptr;
  69   void f(nullptr_t);
  70   void g() { f(null); }
  71 }