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llvm-project/clang/test/CodeGenCXX/cxx11-thread-local.cpp
Tom Honermann 3e25ae605e [Clang] Correct when Itanium ABI guard variables are set for non-block variables with static or thread storage duration. 
Previously, Itanium ABI guard variables were set after initialization was
complete for non-block declared variables with static and thread storage
duration. That resulted in initialization of such variables being restarted
in cases where the variable was referenced while it was still under
construction. Per C++20 [class.cdtor]p2, such references are permitted
(though the value obtained by such an access is unspecified). The late
initialization resulted in recursive reinitialization loops for cases like
this:
  template<typename T>
  struct ct {
    struct mc {
      mc() { ct<T>::smf(); }
      void mf() const {}
    };
    thread_local static mc tlsdm;
    static void smf() { tlsdm.mf(); }
  };
  template<typename T>
  thread_local typename ct<T>::mc ct<T>::tlsdm;
  int main() {
    ct<int>::smf();
  }

With this change, guard variables are set before initialization is started
so as to avoid such reinitialization loops.

Fixes https://github.com/llvm/llvm-project/issues/57828

Reviewed By: rjmccall

Differential Revision: https://reviews.llvm.org/D135919
2022-11-16 16:31:35 -05:00

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// RUN: %clang_cc1 -no-opaque-pointers -std=c++11 -emit-llvm %s -o - -triple x86_64-linux-gnu | FileCheck --check-prefixes=CHECK,LINUX,LINUX_AIX %s
// RUN: %clang_cc1 -no-opaque-pointers -std=c++11 -emit-llvm %s -O2 -disable-llvm-passes -o - -triple x86_64-linux-gnu | FileCheck --check-prefixes=CHECK,LINUX,LINUX_AIX,CHECK-OPT %s
// RUN: %clang_cc1 -no-opaque-pointers -std=c++11 -femulated-tls -emit-llvm %s -o - \
// RUN: -triple x86_64-linux-gnu 2>&1 | FileCheck --check-prefixes=CHECK,LINUX,LINUX_AIX %s
// RUN: %clang_cc1 -no-opaque-pointers -std=c++11 -emit-llvm %s -o - -triple x86_64-apple-darwin12 | FileCheck --check-prefix=CHECK --check-prefix=DARWIN %s
// RUN: %clang_cc1 -no-opaque-pointers -std=c++11 -emit-llvm %s -o - -triple powerpc64-unknown-aix-xcoff | FileCheck --check-prefixes=CHECK,AIX,LINUX_AIX %s
// RUN: %clang_cc1 -no-opaque-pointers -std=c++11 -fno-use-cxa-atexit -emit-llvm %s -o - -triple x86_64-linux-gnu | FileCheck --check-prefixes=CHECK,LINUX,LINUX_AIX %s
// RUN: %clang_cc1 -no-opaque-pointers -std=c++11 -fno-use-cxa-atexit -emit-llvm %s -O2 -disable-llvm-passes -o - -triple x86_64-linux-gnu | FileCheck --check-prefixes=CHECK,LINUX,LINUX_AIX,CHECK-OPT %s
// RUN: %clang_cc1 -no-opaque-pointers -std=c++11 -fno-use-cxa-atexit -femulated-tls -emit-llvm %s -o - \
// RUN: -triple x86_64-linux-gnu 2>&1 | FileCheck --check-prefixes=CHECK,LINUX,LINUX_AIX %s
// RUN: %clang_cc1 -no-opaque-pointers -std=c++11 -fno-use-cxa-atexit -emit-llvm %s -o - -triple x86_64-apple-darwin12 | FileCheck --check-prefix=CHECK --check-prefix=DARWIN %s
int f();
int g();
// LINUX_AIX-DAG: @a ={{.*}} thread_local global i32 0
// DARWIN-DAG: @a = internal thread_local global i32 0
thread_local int a = f();
extern thread_local int b;
// CHECK-DAG: @c ={{.*}} global i32 0
int c = b;
// CHECK-DAG: @_ZL1d = internal thread_local global i32 0
static thread_local int d = g();
struct U { static thread_local int m; };
// LINUX_AIX-DAG: @_ZN1U1mE ={{.*}} thread_local global i32 0
// DARWIN-DAG: @_ZN1U1mE = internal thread_local global i32 0
thread_local int U::m = f();
namespace MismatchedInitType {
// Check that we don't crash here when we're forced to create a new global
// variable (with a different type) when we add the initializer.
union U {
int a;
float f;
constexpr U() : f(0.0) {}
};
static thread_local U u;
void *p = &u;
}
template<typename T> struct V { static thread_local int m; };
template<typename T> thread_local int V<T>::m = g();
template<typename T> struct W { static thread_local int m; };
template<typename T> thread_local int W<T>::m = 123;
struct Dtor { ~Dtor(); };
template<typename T> struct X { static thread_local Dtor m; };
template<typename T> thread_local Dtor X<T>::m;
// CHECK-DAG: @e ={{.*}} global
void *e = V<int>::m + W<int>::m + &X<int>::m;
template thread_local int V<float>::m;
template thread_local int W<float>::m;
template thread_local Dtor X<float>::m;
extern template thread_local int V<char>::m;
extern template thread_local int W<char>::m;
extern template thread_local Dtor X<char>::m;
void *e2 = V<char>::m + W<char>::m + &X<char>::m;
// CHECK-DAG: @_ZN1VIiE1mE = linkonce_odr thread_local global i32 0
// CHECK-DAG: @_ZN1WIiE1mE = linkonce_odr thread_local global i32 123
// CHECK-DAG: @_ZN1XIiE1mE = linkonce_odr thread_local global {{.*}}
// CHECK-DAG: @_ZN1VIfE1mE = weak_odr thread_local global i32 0
// CHECK-DAG: @_ZN1WIfE1mE = weak_odr thread_local global i32 123
// CHECK-DAG: @_ZN1XIfE1mE = weak_odr thread_local global {{.*}}
// CHECK-DAG: @_ZZ1fvE1n = internal thread_local global i32 0
// CHECK-DAG: @_ZGVZ1fvE1n = internal thread_local global i8 0
// CHECK-DAG: @_ZZ8tls_dtorvE1s = internal thread_local global
// CHECK-DAG: @_ZGVZ8tls_dtorvE1s = internal thread_local global i8 0
// CHECK-DAG: @_ZZ8tls_dtorvE1t = internal thread_local global
// CHECK-DAG: @_ZGVZ8tls_dtorvE1t = internal thread_local global i8 0
// CHECK-DAG: @_ZZ8tls_dtorvE1u = internal thread_local global
// CHECK-DAG: @_ZGVZ8tls_dtorvE1u = internal thread_local global i8 0
// CHECK-DAG: @_ZGRZ8tls_dtorvE1u_ = internal thread_local global
// CHECK-DAG: @_ZGVN1VIiE1mE = linkonce_odr thread_local global i64 0
// CHECK-DAG: @__tls_guard = internal thread_local global i8 0
// CHECK-DAG: @llvm.global_ctors = appending global {{.*}} @[[GLOBAL_INIT:[^ ]*]]
// LINUX_AIX-DAG: @_ZTH1a ={{.*}} alias void (), void ()* @__tls_init
// DARWIN-DAG: @_ZTH1a = internal alias void (), void ()* @__tls_init
// LINUX_AIX-DAG: @_ZTHN1U1mE ={{.*}} alias void (), void ()* @__tls_init
// DARWIN-DAG: @_ZTHN1U1mE = internal alias void (), void ()* @__tls_init
// CHECK-DAG: @_ZTHN1VIiE1mE = linkonce_odr alias void (), void ()* @[[V_M_INIT:[^, ]*]]
// CHECK-DAG: @_ZTHN1XIiE1mE = linkonce_odr alias void (), void ()* @[[X_M_INIT:[^, ]*]]
// CHECK-DAG: @_ZTHN1VIfE1mE = weak_odr alias void (), void ()* @[[VF_M_INIT:[^, ]*]]
// CHECK-DAG: @_ZTHN1XIfE1mE = weak_odr alias void (), void ()* @[[XF_M_INIT:[^, ]*]]
// FIXME: We really want a CHECK-DAG-NOT for these.
// CHECK-NOT: @_ZTHN1WIiE1mE =
// CHECK-NOT: @_ZTHN1WIfE1mE =
// CHECK-NOT: @_ZTHL1d =
// Individual variable initialization functions:
// CHECK: define {{.*}} @[[A_INIT:.*]]()
// CHECK: call{{.*}} i32 @_Z1fv()
// CHECK: [[A_ADDR:%.+]] = call align 4 i32* @llvm.threadlocal.address.p0i32(i32* align 4 @a)
// CHECK-NEXT: store i32 {{.*}}, i32* [[A_ADDR]], align 4
// CHECK-LABEL: define{{.*}} i32 @_Z1fv()
int f() {
// CHECK: %[[GUARD:.*]] = load i8, i8* @_ZGVZ1fvE1n, align 1
// CHECK: %[[NEED_INIT:.*]] = icmp eq i8 %[[GUARD]], 0
// CHECK: br i1 %[[NEED_INIT]]{{.*}}
// CHECK: %[[CALL:.*]] = call{{.*}} i32 @_Z1gv()
// CHECK: [[N_ADDR:%.+]] = call align 4 i32* @llvm.threadlocal.address.p0i32(i32* align 4 @_ZZ1fvE1n)
// CHECK: store i32 %[[CALL]], i32* [[N_ADDR]], align 4
// CHECK: store i8 1, i8* @_ZGVZ1fvE1n
// CHECK: br label
static thread_local int n = g();
// CHECK: [[N_ADDR2:%.+]] = call align 4 i32* @llvm.threadlocal.address.p0i32(i32* align 4 @_ZZ1fvE1n)
// CHECK: load i32, i32* [[N_ADDR2]], align 4
return n;
}
// CHECK: define {{.*}} @[[C_INIT:.*]]()
// LINUX_AIX: call i32* @_ZTW1b()
// DARWIN: call cxx_fast_tlscc i32* @_ZTW1b()
// CHECK-NEXT: load i32, i32* %{{.*}}, align 4
// CHECK-NEXT: store i32 %{{.*}}, i32* @c, align 4
// LINUX_AIX-LABEL: define linkonce_odr hidden noundef i32* @_ZTW1b()
// LINUX: br i1 icmp ne (void ()* @_ZTH1b, void ()* null),
// AIX-NOT: br i1 icmp ne (void ()* @_ZTH1b, void ()* null),
// not null:
// LINUX_AIX: call void @_ZTH1b()
// LINUX: br label
// AIX-NOT: br label
// finally:
// LINUX_AIX: [[B_ADDR:%.+]] = call align 4 i32* @llvm.threadlocal.address.p0i32(i32* align 4 @b)
// LINUX_AIX: ret i32* [[B_ADDR]]
// DARWIN-LABEL: declare cxx_fast_tlscc noundef i32* @_ZTW1b()
// There is no definition of the thread wrapper on Darwin for external TLV.
// CHECK: define {{.*}} @[[D_INIT:.*]]()
// CHECK: call{{.*}} i32 @_Z1gv()
// CHECK-NEXT: [[D_ADDR:%.+]] = call align 4 i32* @llvm.threadlocal.address.p0i32(i32* align 4 @_ZL1d)
// CHECK-NEXT: store i32 %{{.*}}, i32* [[D_ADDR]], align 4
// CHECK: define {{.*}} @[[U_M_INIT:.*]]()
// CHECK: call{{.*}} i32 @_Z1fv()
// CHECK-NEXT: [[UM_ADDR:%.+]] = call align 4 i32* @llvm.threadlocal.address.p0i32(i32* align 4 @_ZN1U1mE)
// CHECK-NEXT: store i32 %{{.*}}, i32* [[UM_ADDR]], align 4
// CHECK: define {{.*}} @[[E_INIT:.*]]()
// LINUX_AIX: call i32* @_ZTWN1VIiE1mE()
// DARWIN: call cxx_fast_tlscc i32* @_ZTWN1VIiE1mE()
// CHECK-NEXT: load i32, i32* %{{.*}}, align 4
// LINUX_AIX: call {{.*}}* @_ZTWN1XIiE1mE()
// DARWIN: call cxx_fast_tlscc {{.*}}* @_ZTWN1XIiE1mE()
// CHECK: store {{.*}} @e
// LINUX_AIX-LABEL: define weak_odr hidden noundef i32* @_ZTWN1VIiE1mE()
// DARWIN-LABEL: define weak_odr hidden cxx_fast_tlscc noundef i32* @_ZTWN1VIiE1mE()
// LINUX_AIX: call void @_ZTHN1VIiE1mE()
// DARWIN: call cxx_fast_tlscc void @_ZTHN1VIiE1mE()
// CHECK: [[VM_ADDR:%.+]] = call align 4 i32* @llvm.threadlocal.address.p0i32(i32* align 4 @_ZN1VIiE1mE)
// CHECK: ret i32* [[VM_ADDR]]
// LINUX_AIX-LABEL: define weak_odr hidden noundef i32* @_ZTWN1WIiE1mE()
// DARWIN-LABEL: define weak_odr hidden cxx_fast_tlscc noundef i32* @_ZTWN1WIiE1mE()
// CHECK-NOT: call
// CHECK: [[WM_ADDR:%.+]] = call align 4 i32* @llvm.threadlocal.address.p0i32(i32* align 4 @_ZN1WIiE1mE)
// CHECK: ret i32* [[WM_ADDR]]
// LINUX_AIX-LABEL: define weak_odr hidden {{.*}}* @_ZTWN1XIiE1mE()
// DARWIN-LABEL: define weak_odr hidden cxx_fast_tlscc {{.*}}* @_ZTWN1XIiE1mE()
// LINUX_AIX: call void @_ZTHN1XIiE1mE()
// DARWIN: call cxx_fast_tlscc void @_ZTHN1XIiE1mE()
// CHECK: [[XM_ADDR:%.+]] = call align 1 %struct.Dtor* @llvm.threadlocal.address.p0s_struct.Dtors(%struct.Dtor* align 1 @_ZN1XIiE1mE)
// CHECK: ret {{.*}}* [[XM_ADDR]]
// LINUX_AIX: define internal void @[[VF_M_INIT]]()
// DARWIN: define internal cxx_fast_tlscc void @[[VF_M_INIT]]()
// CHECK-NOT: comdat
// CHECK: load i8, i8* bitcast (i64* @_ZGVN1VIfE1mE to i8*)
// CHECK: %[[VF_M_INITIALIZED:.*]] = icmp eq i8 %{{.*}}, 0
// CHECK: br i1 %[[VF_M_INITIALIZED]],
// need init:
// CHECK: store i8 1, i8* bitcast (i64* @_ZGVN1VIfE1mE to i8*)
// CHECK: call{{.*}} i32 @_Z1gv()
// CHECK: [[VFM_ADDR:%.+]] = call align 4 i32* @llvm.threadlocal.address.p0i32(i32* align 4 @_ZN1VIfE1mE)
// CHECK: store i32 %{{.*}}, i32* [[VFM_ADDR]], align 4
// CHECK: br label
// LINUX_AIX: define internal void @[[XF_M_INIT]]()
// DARWIN: define internal cxx_fast_tlscc void @[[XF_M_INIT]]()
// CHECK-NOT: comdat
// CHECK: load i8, i8* bitcast (i64* @_ZGVN1XIfE1mE to i8*)
// CHECK: %[[XF_M_INITIALIZED:.*]] = icmp eq i8 %{{.*}}, 0
// CHECK: br i1 %[[XF_M_INITIALIZED]],
// need init:
// CHECK: store i8 1, i8* bitcast (i64* @_ZGVN1XIfE1mE to i8*)
// AIX-NOT: br
// LINUX: call {{.*}}__cxa_thread_atexit
// AIX: call {{.*}}__pt_atexit_np
// DARWIN: call {{.*}}_tlv_atexit
// CHECK: br label
// LINUX: declare i32 @__cxa_thread_atexit(void (i8*)*, i8*, i8*)
// AIX: declare i32 @__pt_atexit_np(i32, i32 (i32, ...)*, ...)
// DARWIN: declare i32 @_tlv_atexit(void (i8*)*, i8*, i8*)
// DARWIN: declare cxx_fast_tlscc noundef i32* @_ZTWN1VIcE1mE()
// LINUX_AIX: define linkonce_odr hidden noundef i32* @_ZTWN1VIcE1mE() {{#[0-9]+}}{{( comdat)?}} {
// LINUX: br i1 icmp ne (void ()* @_ZTHN1VIcE1mE,
// AIX-NOT: br i1 icmp ne (void ()* @_ZTHN1VIcE1mE
// LINUX_AIX: call void @_ZTHN1VIcE1mE()
// LINUX_AIX: [[VEM_ADDR:%.+]] = call align 4 i32* @llvm.threadlocal.address.p0i32(i32* align 4 @_ZN1VIcE1mE)
// LINUX_AIX: ret i32* [[VEM_ADDR]]
// DARWIN: declare cxx_fast_tlscc noundef i32* @_ZTWN1WIcE1mE()
// LINUX_AIX: define linkonce_odr hidden noundef i32* @_ZTWN1WIcE1mE() {{#[0-9]+}}{{( comdat)?}} {
// LINUX: br i1 icmp ne (void ()* @_ZTHN1WIcE1mE,
// AIX-NOT: br i1 icmp ne (void ()* @_ZTHN1WIcE1mE,
// LINUX_AIX: call void @_ZTHN1WIcE1mE()
// LINUX_AIX: [[WEM_ADDR:%.+]] = call align 4 i32* @llvm.threadlocal.address.p0i32(i32* align 4 @_ZN1WIcE1mE)
// LINUX_AIX: ret i32* [[WEM_ADDR]]
// DARWIN: declare cxx_fast_tlscc {{.*}}* @_ZTWN1XIcE1mE()
// LINUX_AIX: define linkonce_odr hidden {{.*}}* @_ZTWN1XIcE1mE() {{#[0-9]+}}{{( comdat)?}} {
// LINUX: br i1 icmp ne (void ()* @_ZTHN1XIcE1mE,
// AIX-NOT: br i1 icmp ne (void ()* @_ZTHN1XIcE1mE,
// LINUX_AIX: call void @_ZTHN1XIcE1mE()
// LINUX_AIX: [[XEM_ADDR:%.+]] = call align 1 %struct.Dtor* @llvm.threadlocal.address.p0s_struct.Dtors(%struct.Dtor* align 1 @_ZN1XIcE1mE)
// LINUX_AIX: ret {{.*}}* [[XEM_ADDR]]
struct S { S(); ~S(); };
struct T { ~T(); };
// CHECK-LABEL: define{{.*}} void @_Z8tls_dtorv()
void tls_dtor() {
// CHECK: load i8, i8* @_ZGVZ8tls_dtorvE1s
// CHECK: call void @_ZN1SC1Ev(%struct.S* {{[^,]*}} @_ZZ8tls_dtorvE1s)
// LINUX: call i32 @__cxa_thread_atexit({{.*}}@_ZN1SD1Ev {{.*}} @_ZZ8tls_dtorvE1s{{.*}} @__dso_handle
// AIX: call i32 (i32, i32 (i32, ...)*, ...) @__pt_atexit_np(i32 0, {{.*}}@__dtor__ZZ8tls_dtorvE1s){{.*}}
// DARWIN: call i32 @_tlv_atexit({{.*}}@_ZN1SD1Ev {{.*}} @_ZZ8tls_dtorvE1s{{.*}} @__dso_handle
// CHECK: store i8 1, i8* @_ZGVZ8tls_dtorvE1s
static thread_local S s;
// CHECK: load i8, i8* @_ZGVZ8tls_dtorvE1t
// CHECK-NOT: _ZN1T
// LINUX: call i32 @__cxa_thread_atexit({{.*}}@_ZN1TD1Ev {{.*}}@_ZZ8tls_dtorvE1t{{.*}} @__dso_handle
// AIX: call i32 (i32, i32 (i32, ...)*, ...) @__pt_atexit_np(i32 0, {{.*}}@__dtor__ZZ8tls_dtorvE1t){{.*}}
// DARWIN: call i32 @_tlv_atexit({{.*}}@_ZN1TD1Ev {{.*}}@_ZZ8tls_dtorvE1t{{.*}} @__dso_handle
// CHECK: store i8 1, i8* @_ZGVZ8tls_dtorvE1t
static thread_local T t;
// CHECK: load i8, i8* @_ZGVZ8tls_dtorvE1u
// CHECK: call void @_ZN1SC1Ev(%struct.S* {{[^,]*}} @_ZGRZ8tls_dtorvE1u_)
// LINUX: call i32 @__cxa_thread_atexit({{.*}}@_ZN1SD1Ev {{.*}} @_ZGRZ8tls_dtorvE1u_{{.*}} @__dso_handle
// AIX: call i32 (i32, i32 (i32, ...)*, ...) @__pt_atexit_np(i32 0, {{.*}}__dtor__ZZ8tls_dtorvE1u){{.*}}
// DARWIN: call i32 @_tlv_atexit({{.*}}@_ZN1SD1Ev {{.*}} @_ZGRZ8tls_dtorvE1u_{{.*}} @__dso_handle
// CHECK: store i8 1, i8* @_ZGVZ8tls_dtorvE1u
static thread_local const S &u = S();
}
// AIX: define {{.*}}@__dtor__ZZ8tls_dtorvE1s(i32 noundef signext %0, ...){{.*}}{
// AIX: entry:
// AIX: %.addr = alloca i32, align 4
// AIX: store i32 %0, i32* %.addr, align 4
// AIX: call void @_ZN1SD1Ev(%struct.S* @_ZZ8tls_dtorvE1s)
// AIX: ret i32 0
// AIX: }
// AIX: define {{.*}}@__dtor__ZZ8tls_dtorvE1t(i32 noundef signext %0, ...){{.*}}{
// AIX: entry:
// AIX: %.addr = alloca i32, align 4
// AIX: store i32 %0, i32* %.addr, align 4
// AIX: call void @_ZN1TD1Ev(%struct.T* @_ZZ8tls_dtorvE1t)
// AIX: ret i32 0
// AIX: }
// AIX: define {{.*}}@__dtor__ZZ8tls_dtorvE1u(i32 noundef signext %0, ...){{.*}}{
// AIX: entry:
// AIX: %.addr = alloca i32, align 4
// AIX: store i32 %0, i32* %.addr, align 4
// AIX: call void @_ZN1SD1Ev(%struct.S* @_ZGRZ8tls_dtorvE1u_)
// AIX: ret i32 0
// AIX: }
// CHECK: define {{.*}} @_Z7PR15991v(
int PR15991() {
thread_local int n;
auto l = [] { return n; };
return l();
}
struct PR19254 {
static thread_local int n;
int f();
};
// CHECK: define {{.*}} @_ZN7PR192541fEv(
int PR19254::f() {
// LINUX_AIX: call void @_ZTHN7PR192541nE(
// DARWIN: call cxx_fast_tlscc i32* @_ZTWN7PR192541nE(
return this->n;
}
namespace {
thread_local int anon_i{f()};
}
void set_anon_i() {
anon_i = 2;
}
// LINUX_AIX-LABEL: define internal noundef i32* @_ZTWN12_GLOBAL__N_16anon_iE()
// DARWIN-LABEL: define internal cxx_fast_tlscc noundef i32* @_ZTWN12_GLOBAL__N_16anon_iE()
// LINUX_AIX: define internal void @[[V_M_INIT]]()
// DARWIN: define internal cxx_fast_tlscc void @[[V_M_INIT]]()
// CHECK-NOT: comdat
// CHECK: load i8, i8* bitcast (i64* @_ZGVN1VIiE1mE to i8*)
// CHECK: %[[V_M_INITIALIZED:.*]] = icmp eq i8 %{{.*}}, 0
// CHECK: br i1 %[[V_M_INITIALIZED]],
// need init:
// CHECK: store i8 1, i8* bitcast (i64* @_ZGVN1VIiE1mE to i8*)
// CHECK: call{{.*}} i32 @_Z1gv()
// CHECK: [[VEM_ADDR:%.+]] = call align 4 i32* @llvm.threadlocal.address.p0i32(i32* align 4 @_ZN1VIiE1mE)
// CHECK: store i32 %{{.*}}, i32* [[VEM_ADDR]], align 4
// CHECK: br label
// LINUX_AIX: define internal void @[[X_M_INIT]]()
// DARWIN: define internal cxx_fast_tlscc void @[[X_M_INIT]]()
// CHECK-NOT: comdat
// CHECK: load i8, i8* bitcast (i64* @_ZGVN1XIiE1mE to i8*)
// CHECK: %[[X_M_INITIALIZED:.*]] = icmp eq i8 %{{.*}}, 0
// CHECK: br i1 %[[X_M_INITIALIZED]],
// need init:
// CHECK: store i8 1, i8* bitcast (i64* @_ZGVN1XIiE1mE to i8*)
// LINUX: call {{.*}}__cxa_thread_atexit
// AIX: call {{.*}}__pt_atexit_np
// DARWIN: call {{.*}}_tlv_atexit
// CHECK: br label
// CHECK: define {{.*}}@[[GLOBAL_INIT:.*]]()
// CHECK: call void @[[C_INIT]]()
// CHECK: call void @[[E_INIT]]()
// CHECK: define {{.*}}@__tls_init()
// CHECK: load i8, i8* @__tls_guard
// CHECK: %[[NEED_TLS_INIT:.*]] = icmp eq i8 %{{.*}}, 0
// CHECK: br i1 %[[NEED_TLS_INIT]],
// init:
// CHECK: store i8 1, i8* @__tls_guard
// CHECK-OPT: call {}* @llvm.invariant.start.p0i8(i64 1, i8* @__tls_guard)
// CHECK-NOT: call void @[[V_M_INIT]]()
// CHECK: call void @[[A_INIT]]()
// CHECK-NOT: call void @[[V_M_INIT]]()
// CHECK: call void @[[D_INIT]]()
// CHECK-NOT: call void @[[V_M_INIT]]()
// CHECK: call void @[[U_M_INIT]]()
// CHECK-NOT: call void @[[V_M_INIT]]()
// LINUX_AIX: define weak_odr hidden noundef i32* @_ZTW1a()
// DARWIN: define cxx_fast_tlscc noundef i32* @_ZTW1a()
// LINUX_AIX: call void @_ZTH1a()
// DARWIN: call cxx_fast_tlscc void @_ZTH1a()
// CHECK: [[A_ADDR:%.+]] = call align 4 i32* @llvm.threadlocal.address.p0i32(i32* align 4 @a)
// CHECK: ret i32* [[A_ADDR]]
// CHECK: }
// Should not emit a thread wrapper for internal-linkage unused variable 'd'.
// We separately check that 'd' does in fact get initialized with the other
// thread-local variables in this TU.
// CHECK-NOT: define {{.*}} @_ZTWL1d()
// LINUX_AIX-LABEL: define weak_odr hidden noundef i32* @_ZTWN1U1mE()
// DARWIN-LABEL: define cxx_fast_tlscc noundef i32* @_ZTWN1U1mE()
// LINUX_AIX: call void @_ZTHN1U1mE()
// DARWIN: call cxx_fast_tlscc void @_ZTHN1U1mE()
// CHECK: [[UM_ADDR:%.+]] = call align 4 i32* @llvm.threadlocal.address.p0i32(i32* align 4 @_ZN1U1mE)
// CHECK: ret i32* [[UM_ADDR]]
// LINUX_AIX: declare extern_weak void @_ZTH1b() [[ATTR:#[0-9]+]]
// AIX: define linkonce_odr void @_ZTHN1WIiE1mE(){{.*}} {
// AIX-NEXT: ret void
// AIX-NEXT: }
// CHECK-NOT: @_ZTHN1WIfE1mE =
// AIX: define weak_odr void @_ZTHN1WIfE1mE(){{.*}} {
// AIX-NEXT: ret void
// AIX-NEXT: }
// LINUX_AIX: attributes [[ATTR]] = { {{.+}} }
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