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llvm-project/clang/test/CodeGenCXX/cxx11-thread-local.cpp
Vlad Tsyrklevich c93390b5c5 TLS: Respect visibility for thread_local variables on Darwin (PR40327) 
Summary:
Teach clang to mark thread wrappers for thread_local variables with
hidden visibility when the original variable is marked with hidden
visibility. This is necessary on Darwin which exposes the thread wrapper
instead of the thread variable. The thread wrapper would previously
always be created with default visibility unless it had
linkonce*/weak_odr linkage.

Reviewers: rjmccall

Reviewed By: rjmccall

Differential Revision: https://reviews.llvm.org/D56818

llvm-svn: 351457
2019-01-17 17:53:45 +00:00

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// RUN: %clang_cc1 -std=c++11 -emit-llvm %s -o - -triple x86_64-linux-gnu | FileCheck --check-prefix=CHECK --check-prefix=LINUX %s
// RUN: %clang_cc1 -std=c++11 -emit-llvm %s -O2 -disable-llvm-passes -o - -triple x86_64-linux-gnu | FileCheck --check-prefix=CHECK --check-prefix=LINUX --check-prefix=CHECK-OPT %s
// RUN: %clang_cc1 -std=c++11 -femulated-tls -emit-llvm %s -o - \
// RUN: -triple x86_64-linux-gnu 2>&1 | FileCheck --check-prefix=CHECK --check-prefix=LINUX %s
// RUN: %clang_cc1 -std=c++11 -emit-llvm %s -o - -triple x86_64-apple-darwin12 | FileCheck --check-prefix=CHECK --check-prefix=DARWIN %s
int f();
int g();
// LINUX-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-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-DAG: @_ZTH1a = alias void (), void ()* @__tls_init
// DARWIN-DAG: @_ZTH1a = internal alias void (), void ()* @__tls_init
// CHECK-DAG: @_ZTHL1d = internal alias void (), void ()* @__tls_init
// LINUX-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-NOT: @_ZTHN1WIiE1mE =
// CHECK-DAG: @_ZTHN1XIiE1mE = linkonce_odr alias void (), void ()* @[[X_M_INIT:[^, ]*]]
// CHECK-DAG: @_ZTHN1VIfE1mE = weak_odr alias void (), void ()* @[[VF_M_INIT:[^, ]*]]
// CHECK-NOT: @_ZTHN1WIfE1mE =
// CHECK-DAG: @_ZTHN1XIfE1mE = weak_odr alias void (), void ()* @[[XF_M_INIT:[^, ]*]]
// Individual variable initialization functions:
// CHECK: define {{.*}} @[[A_INIT:.*]]()
// CHECK: call i32 @_Z1fv()
// CHECK-NEXT: store i32 {{.*}}, i32* @a, 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: store i32 %[[CALL]], i32* @_ZZ1fvE1n, align 4
// CHECK: store i8 1, i8* @_ZGVZ1fvE1n
// CHECK: br label
static thread_local int n = g();
// CHECK: load i32, i32* @_ZZ1fvE1n, align 4
return n;
}
// CHECK: define {{.*}} @[[C_INIT:.*]]()
// LINUX: 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-LABEL: define weak_odr hidden i32* @_ZTW1b()
// LINUX: br i1 icmp ne (void ()* @_ZTH1b, void ()* null),
// not null:
// LINUX: call void @_ZTH1b()
// LINUX: br label
// finally:
// LINUX: ret i32* @b
// DARWIN-LABEL: declare cxx_fast_tlscc 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: store i32 %{{.*}}, i32* @_ZL1d, align 4
// CHECK: define {{.*}} @[[U_M_INIT:.*]]()
// CHECK: call i32 @_Z1fv()
// CHECK-NEXT: store i32 %{{.*}}, i32* @_ZN1U1mE, align 4
// CHECK: define {{.*}} @[[E_INIT:.*]]()
// LINUX: call i32* @_ZTWN1VIiE1mE()
// DARWIN: call cxx_fast_tlscc i32* @_ZTWN1VIiE1mE()
// CHECK-NEXT: load i32, i32* %{{.*}}, align 4
// LINUX: call {{.*}}* @_ZTWN1XIiE1mE()
// DARWIN: call cxx_fast_tlscc {{.*}}* @_ZTWN1XIiE1mE()
// CHECK: store {{.*}} @e
// LINUX-LABEL: define weak_odr hidden i32* @_ZTWN1VIiE1mE()
// DARWIN-LABEL: define weak_odr hidden cxx_fast_tlscc i32* @_ZTWN1VIiE1mE()
// LINUX: call void @_ZTHN1VIiE1mE()
// DARWIN: call cxx_fast_tlscc void @_ZTHN1VIiE1mE()
// CHECK: ret i32* @_ZN1VIiE1mE
// LINUX-LABEL: define weak_odr hidden i32* @_ZTWN1WIiE1mE()
// DARWIN-LABEL: define weak_odr hidden cxx_fast_tlscc i32* @_ZTWN1WIiE1mE()
// CHECK-NOT: call
// CHECK: ret i32* @_ZN1WIiE1mE
// LINUX-LABEL: define weak_odr hidden {{.*}}* @_ZTWN1XIiE1mE()
// DARWIN-LABEL: define weak_odr hidden cxx_fast_tlscc {{.*}}* @_ZTWN1XIiE1mE()
// LINUX: call void @_ZTHN1XIiE1mE()
// DARWIN: call cxx_fast_tlscc void @_ZTHN1XIiE1mE()
// CHECK: ret {{.*}}* @_ZN1XIiE1mE
// LINUX: define internal void @[[VF_M_INIT]]()
// DARWIN: define internal cxx_fast_tlscc void @[[VF_M_INIT]]()
// LINUX-SAME: comdat($_ZN1VIfE1mE)
// DARWIN-NOT: comdat
// CHECK: load i8, i8* bitcast (i64* @_ZGVN1VIfE1mE to i8*)
// CHECK: %[[VF_M_INITIALIZED:.*]] = icmp eq i8 %{{.*}}, 0
// CHECK: br i1 %[[VF_M_INITIALIZED]],
// need init:
// CHECK: call i32 @_Z1gv()
// CHECK: store i32 %{{.*}}, i32* @_ZN1VIfE1mE, align 4
// CHECK: store i64 1, i64* @_ZGVN1VIfE1mE
// CHECK: br label
// LINUX: define internal void @[[XF_M_INIT]]()
// DARWIN: define internal cxx_fast_tlscc void @[[XF_M_INIT]]()
// LINUX-SAME: comdat($_ZN1XIfE1mE)
// DARWIN-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:
// LINUX: call {{.*}}__cxa_thread_atexit
// DARWIN: call {{.*}}_tlv_atexit
// CHECK: store i64 1, i64* @_ZGVN1XIfE1mE
// CHECK: br label
// LINUX: declare i32 @__cxa_thread_atexit(void (i8*)*, i8*, i8*)
// DARWIN: declare i32 @_tlv_atexit(void (i8*)*, i8*, i8*)
// DARWIN: declare cxx_fast_tlscc i32* @_ZTWN1VIcE1mE()
// LINUX: define weak_odr hidden i32* @_ZTWN1VIcE1mE()
// LINUX-NOT: comdat
// LINUX: br i1 icmp ne (void ()* @_ZTHN1VIcE1mE,
// LINUX: call void @_ZTHN1VIcE1mE()
// LINUX: ret i32* @_ZN1VIcE1mE
// DARWIN: declare cxx_fast_tlscc i32* @_ZTWN1WIcE1mE()
// LINUX: define weak_odr hidden i32* @_ZTWN1WIcE1mE()
// LINUX-NOT: comdat
// LINUX: br i1 icmp ne (void ()* @_ZTHN1WIcE1mE,
// LINUX: call void @_ZTHN1WIcE1mE()
// LINUX: ret i32* @_ZN1WIcE1mE
// DARWIN: declare cxx_fast_tlscc {{.*}}* @_ZTWN1XIcE1mE()
// LINUX: define weak_odr hidden {{.*}}* @_ZTWN1XIcE1mE()
// LINUX-NOT: comdat
// LINUX: br i1 icmp ne (void ()* @_ZTHN1XIcE1mE,
// LINUX: call void @_ZTHN1XIcE1mE()
// LINUX: ret {{.*}}* @_ZN1XIcE1mE
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
// 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
// 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
// DARWIN: call i32 @_tlv_atexit({{.*}}@_ZN1SD1Ev {{.*}} @_ZGRZ8tls_dtorvE1u_{{.*}} @__dso_handle
// CHECK: store i8 1, i8* @_ZGVZ8tls_dtorvE1u
static thread_local const S &u = S();
}
// 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: call void @_ZTHN7PR192541nE(
// DARWIN: call cxx_fast_tlscc i32* @_ZTWN7PR192541nE(
return this->n;
}
namespace {
thread_local int anon_i{1};
}
void set_anon_i() {
anon_i = 2;
}
// LINUX-LABEL: define internal i32* @_ZTWN12_GLOBAL__N_16anon_iE()
// DARWIN-LABEL: define internal cxx_fast_tlscc i32* @_ZTWN12_GLOBAL__N_16anon_iE()
// LINUX: define internal void @[[V_M_INIT]]()
// DARWIN: define internal cxx_fast_tlscc void @[[V_M_INIT]]()
// LINUX-SAME: comdat($_ZN1VIiE1mE)
// DARWIN-NOT: comdat
// CHECK: load i8, i8* bitcast (i64* @_ZGVN1VIiE1mE to i8*)
// CHECK: %[[V_M_INITIALIZED:.*]] = icmp eq i8 %{{.*}}, 0
// CHECK: br i1 %[[V_M_INITIALIZED]],
// need init:
// CHECK: call i32 @_Z1gv()
// CHECK: store i32 %{{.*}}, i32* @_ZN1VIiE1mE, align 4
// CHECK: store i64 1, i64* @_ZGVN1VIiE1mE
// CHECK: br label
// LINUX: define internal void @[[X_M_INIT]]()
// DARWIN: define internal cxx_fast_tlscc void @[[X_M_INIT]]()
// LINUX-SAME: comdat($_ZN1XIiE1mE)
// DARWIN-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:
// LINUX: call {{.*}}__cxa_thread_atexit
// DARWIN: call {{.*}}_tlv_atexit
// CHECK: store i64 1, i64* @_ZGVN1XIiE1mE
// 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: define weak_odr hidden i32* @_ZTW1a()
// DARWIN: define cxx_fast_tlscc i32* @_ZTW1a()
// LINUX: call void @_ZTH1a()
// DARWIN: call cxx_fast_tlscc void @_ZTH1a()
// CHECK: ret i32* @a
// CHECK: }
// LINUX: declare extern_weak void @_ZTH1b() [[ATTR:#[0-9]+]]
// LINUX-LABEL: define internal i32* @_ZTWL1d()
// DARWIN-LABEL: define internal cxx_fast_tlscc i32* @_ZTWL1d()
// LINUX: call void @_ZTHL1d()
// DARWIN: call cxx_fast_tlscc void @_ZTHL1d()
// CHECK: ret i32* @_ZL1d
// LINUX-LABEL: define weak_odr hidden i32* @_ZTWN1U1mE()
// DARWIN-LABEL: define cxx_fast_tlscc i32* @_ZTWN1U1mE()
// LINUX: call void @_ZTHN1U1mE()
// DARWIN: call cxx_fast_tlscc void @_ZTHN1U1mE()
// CHECK: ret i32* @_ZN1U1mE
// LINUX: attributes [[ATTR]] = { {{.+}} }
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