clang/test/CodeGenCXX/cxx1y-variable-template.cpp

   1 // RUN: %clang_cc1 -std=c++1y -triple x86_64-linux-gnu -emit-llvm -o - %s | FileCheck %s
   2
   3 // Check that we keep the 'extern' when we instantiate the definition of this
   4 // variable template specialization.
   5 template<typename T> extern const int extern_redecl;
   6 template<typename T> const int extern_redecl = 5;
   7 template const int extern_redecl<int>;
   8
   9 // CHECK: @_Z13extern_redeclIiE = weak_odr constant
  10
  11 template<typename T> struct Outer {
  12   template<typename U> struct Inner {
  13     template<typename V> static int arr[];
  14   };
  15 };
  16 Outer<char[100]> outer_int;
  17 int init_arr();
  18 template<typename T> template<typename U> template<typename V> int Outer<T>::Inner<U>::arr[sizeof(T) + sizeof(U) + sizeof(V)] = { init_arr() };
  19 int *p = Outer<char[100]>::Inner<char[20]>::arr<char[3]>;
  20
  21 namespace PR35456 {
  22 // CHECK: @_ZN7PR354561nILi0EEE = linkonce_odr global i32 0
  23 template<int> int n;
  24 int *p = &n<0>;
  25 }
  26
  27 // CHECK: @_ZN5OuterIA100_cE5InnerIA20_cE3arrIA3_cEE = linkonce_odr global [123 x i32] zeroinitializer
  28 // CHECK: @_ZGVN5OuterIA100_cE5InnerIA20_cE3arrIA3_cEE = linkonce_odr global
  29
  30 // CHECK: @_ZTHN7PR4211112_GLOBAL__N_11nILi0EEE = internal alias {{.*}} @[[PR42111_CTOR:.*]]
  31
  32 // CHECK: call {{.*}}@_Z8init_arrv
  33
  34 // Ensure that we use guarded initialization for an instantiated thread_local
  35 // variable with internal linkage.
  36 namespace PR42111 {
  37   int f();
  38   namespace { template <int = 0> thread_local int n = f(); }
  39   // CHECK: define {{.*}}@[[PR42111_CTOR]](
  40   // CHECK: load {{.*}} @_ZGVN7PR4211112_GLOBAL__N_11nILi0EEE
  41   // CHECK: icmp eq i8 {{.*}}, 0
  42   // CHECK: br i1
  43   // CHECK: store i8 1, ptr @_ZGVN7PR4211112_GLOBAL__N_11nILi0EEE
  44   // CHECK: call noundef i32 @_ZN7PR421111fEv(
  45   // CHECK: [[N_ADDR:%.+]] = call align 4 ptr @llvm.threadlocal.address.p0(ptr align 4 @_ZN7PR4211112_GLOBAL__N_11nILi0EEE)
  46   // CHECK: store i32 {{.*}}, ptr [[N_ADDR]]
  47   int g() { return n<> + n<>; }
  48 }