caio/clang-p2996
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity
Files
ef2cdfe393d01cd4935c806387ac912b5a2c8ced
clang-p2996/clang/test/CodeGenCXX/cxx11-thread-local.cpp
Richard Smith cd4d6d718b PR48030: Fix COMDAT-related linking problem with C++ thread_local static data members. 
Previously when emitting a C++ guarded initializer, we tried to work out what
the enclosing function would be used for and added it to the COMDAT containing
the variable if we thought that doing so would be correct. But this was done
from a context in which we didn't -- and realistically couldn't -- correctly
infer how the enclosing function would be used.

Instead, add the initialization function to a COMDAT from the code that
creates it, in the case where it makes sense to do so: when we know that
the one and only reference to the initialization function is in
@llvm.global.ctors and that reference is in the same COMDAT.

Reviewed By: rjmccall

Differential Revision: https://reviews.llvm.org/D108680
2021-08-24 19:53:44 -07:00

388 lines
15 KiB
C++
Raw Blame History

// RUN: %clang_cc1 -std=c++11 -emit-llvm %s -o - -triple x86_64-linux-gnu | FileCheck --check-prefixes=CHECK,LINUX,LINUX_AIX %s
// RUN: %clang_cc1 -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 -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 -std=c++11 -emit-llvm %s -o - -triple x86_64-apple-darwin12 | FileCheck --check-prefix=CHECK --check-prefix=DARWIN %s
// RUN: %clang_cc1 -std=c++11 -emit-llvm %s -o - -triple powerpc64-unknown-aix-xcoff | FileCheck --check-prefixes=CHECK,AIX,LINUX_AIX %s
// RUN: %clang_cc1 -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 -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 -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 -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-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_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 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: 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_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 i32* @_ZTWN1VIiE1mE()
// DARWIN-LABEL: define weak_odr hidden cxx_fast_tlscc i32* @_ZTWN1VIiE1mE()
// LINUX_AIX: call void @_ZTHN1VIiE1mE()
// DARWIN: call cxx_fast_tlscc void @_ZTHN1VIiE1mE()
// CHECK: ret i32* @_ZN1VIiE1mE
// LINUX_AIX-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_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: ret {{.*}}* @_ZN1XIiE1mE
// 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: call{{.*}} i32 @_Z1gv()
// CHECK: store i32 %{{.*}}, i32* @_ZN1VIfE1mE, align 4
// CHECK: store i8 1, i8* bitcast (i64* @_ZGVN1VIfE1mE to i8*)
// 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:
// AIX-NOT: br
// LINUX: call {{.*}}__cxa_thread_atexit
// AIX: call {{.*}}__pt_atexit_np
// DARWIN: call {{.*}}_tlv_atexit
// CHECK: store i8 1, i8* bitcast (i64* @_ZGVN1XIfE1mE to i8*)
// 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 i32* @_ZTWN1VIcE1mE()
// LINUX_AIX: define linkonce_odr hidden 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: ret i32* @_ZN1VIcE1mE
// DARWIN: declare cxx_fast_tlscc i32* @_ZTWN1WIcE1mE()
// LINUX_AIX: define linkonce_odr hidden 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: ret i32* @_ZN1WIcE1mE
// 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: 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
// 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 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 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 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 i32* @_ZTWN12_GLOBAL__N_16anon_iE()
// DARWIN-LABEL: define internal cxx_fast_tlscc 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: call{{.*}} i32 @_Z1gv()
// CHECK: store i32 %{{.*}}, i32* @_ZN1VIiE1mE, align 4
// CHECK: store i8 1, i8* bitcast (i64* @_ZGVN1VIiE1mE to i8*)
// 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:
// LINUX: call {{.*}}__cxa_thread_atexit
// AIX: call {{.*}}__pt_atexit_np
// DARWIN: call {{.*}}_tlv_atexit
// CHECK: store i8 1, i8* bitcast (i64* @_ZGVN1XIiE1mE to i8*)
// 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 i32* @_ZTW1a()
// DARWIN: define cxx_fast_tlscc i32* @_ZTW1a()
// LINUX_AIX: call void @_ZTH1a()
// DARWIN: call cxx_fast_tlscc void @_ZTH1a()
// CHECK: ret i32* @a
// 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 i32* @_ZTWN1U1mE()
// DARWIN-LABEL: define cxx_fast_tlscc i32* @_ZTWN1U1mE()
// LINUX_AIX: call void @_ZTHN1U1mE()
// DARWIN: call cxx_fast_tlscc void @_ZTHN1U1mE()
// CHECK: ret i32* @_ZN1U1mE
// 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]] = { {{.+}} }
Reference in New Issue View Git Blame Copy Permalink