clang/test/CodeGenCXX/cxx11-thread-local-instantiated.cpp

   1 // RUN: %clang_cc1 -std=c++11 -emit-llvm %s -o - -triple x86_64-linux-gnu | FileCheck %s
   2
   3 // PR48030
   4
   5 template<typename T> struct TLS { static thread_local T *mData; };
   6 inline decltype(nullptr) non_constant_initializer() { return nullptr; }
   7 template<typename T> thread_local T *TLS<T>::mData = non_constant_initializer();
   8 struct S {};
   9 S *current() { return TLS<S>::mData; };
  10
  11 // CHECK-DAG: @_ZN3TLSI1SE5mDataE = linkonce_odr thread_local global {{.*}}, comdat,
  12 // CHECK-DAG: @_ZGVN3TLSI1SE5mDataE = linkonce_odr thread_local global {{.*}}, comdat($_ZN3TLSI1SE5mDataE),
  13 // CHECK-DAG: @_ZTHN3TLSI1SE5mDataE = linkonce_odr alias {{.*}} @__cxx_global_var_init
  14
  15 // CHECK-LABEL: define {{.*}} @_Z7currentv()
  16 // CHECK: call {{.*}} @_ZTWN3TLSI1SE5mDataE()
  17
  18 // CHECK-LABEL: define weak_odr hidden {{.*}} @_ZTWN3TLSI1SE5mDataE() {{.*}} comdat {
  19 // CHECK: call void @_ZTHN3TLSI1SE5mDataE()
  20 // CHECK: [[TLSmData_ADDR:%[^ ]+]] = call align 8 ptr @llvm.threadlocal.address.p0(ptr align 8 @_ZN3TLSI1SE5mDataE)
  21 // CHECK: ret {{.*}} [[TLSmData_ADDR]]
  22
  23 // Unlike for a global, the global initialization function must not be in a
  24 // COMDAT with the variable, because it is referenced from the _ZTH function
  25 // which is outside that COMDAT.
  26 //
  27 // CHECK-NOT: define {{.*}} @__cxx_global_var_init{{.*}}comdat