aca3d067ef
Unlike other platforms using ItaniumCXXABI, Darwin does not allow the creation of a thread-wrapper function for a variable in the TU of users. Because of this, it can set the linkage of the thread-local symbol to internal, with the assumption that no TUs other than the one defining the variable will need it. However, constinit thread_local variables do not require the use of the thread-wrapper call, so users reference the variable directly. Thus, it must not be converted to internal, or users will get a link failure. This was a regression introduced by the optimization in 00223827a952f66e7426c9881a2a4229e59bb019. Differential Revision: https://reviews.llvm.org/D80417
87 lines
2.8 KiB
C++
87 lines
2.8 KiB
C++
// RUN: %clang_cc1 -triple x86_64-linux-gnu -std=c++2a %s -emit-llvm -o - | FileCheck --check-prefix=CHECK --check-prefix=LINUX %s
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// RUN: %clang_cc1 -triple x86_64-apple-darwin12 -std=c++2a %s -emit-llvm -o - | FileCheck --check-prefix=CHECK --check-prefix=DARWIN %s
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// Check variable definitions/declarations. Note that on Darwin, typically the
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// variable's symbol is marked internal, and only the _ZTW function is
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// exported. Except: constinit variables do get exported, even on darwin.
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// CHECK-DAG: @a = external thread_local global i32
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// CHECK-DAG: @b = external thread_local global i32
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// LINUX-DAG: @c = thread_local global i32 0, align 4
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// DARWIN-DAG: @c = internal thread_local global i32 0, align 4
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// LINUX-DAG: @d = thread_local global i32 0, align 4
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// DARWIN-DAG: @d = internal thread_local global i32 0, align 4
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// CHECK-DAG: @e = external thread_local global %struct.Destructed, align 4
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// CHECK-DAG: @e2 = thread_local global %struct.Destructed zeroinitializer, align 4
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// CHECK-DAG: @f = thread_local global i32 4, align 4
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extern thread_local int a;
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extern thread_local constinit int b;
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// CHECK-LABEL: define i32 @_Z5get_av()
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// CHECK: call {{(cxx_fast_tlscc )?}}i32* @_ZTW1a()
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// CHECK: }
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int get_a() { return a; }
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// LINUX-LABEL: define linkonce_odr {{.*}} @_ZTW1a()
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// LINUX: br i1
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// LINUX: call void @_ZTH1a()
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// LINUX: }
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// DARWIN-NOT: define {{.*}}@_ZTW1a()
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// CHECK-LABEL: define i32 @_Z5get_bv()
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// CHECK-NOT: call
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// CHECK: load i32, i32* @b
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// CHECK-NOT: call
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// CHECK: }
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int get_b() { return b; }
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// CHECK-NOT: define {{.*}} @_ZTW1b()
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extern thread_local int c;
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// CHECK-LABEL: define i32 @_Z5get_cv()
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// LINUX: call {{(cxx_fast_tlscc )?}}i32* @_ZTW1c()
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// CHECK: load i32, i32* %
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// CHECK: }
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int get_c() { return c; }
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// Note: use of 'c' does not trigger initialization of 'd', because 'c' has a
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// constant initializer.
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// DARWIN-LABEL: define cxx_fast_tlscc {{.*}} @_ZTW1c()
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// LINUX-LABEL: define weak_odr {{.*}} @_ZTW1c()
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// CHECK-NOT: br i1
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// CHECK-NOT: call
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// CHECK: ret i32* @c
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// CHECK: }
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thread_local int c = 0;
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int d_init();
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// CHECK: define {{.*}}[[D_INIT:@__cxx_global_var_init[^(]*]](
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// CHECK: call {{.*}} @_Z6d_initv()
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thread_local int d = d_init();
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struct Destructed {
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int n = 0;
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~Destructed();
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};
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extern thread_local constinit Destructed e;
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// CHECK-LABEL: define i32 @_Z5get_ev()
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// CHECK: call {{.*}}* @_ZTW1e()
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// CHECK: }
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int get_e() { return e.n; }
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// CHECK: define {{.*}}[[E2_INIT:@__cxx_global_var_init[^(]*]](
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// LINUX: call {{.*}} @__cxa_thread_atexit({{.*}} @_ZN10DestructedD1Ev {{.*}} @e2
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// DARWIN: call {{.*}} @_tlv_atexit({{.*}} @_ZN10DestructedD1Ev {{.*}} @e2
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thread_local constinit Destructed e2;
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thread_local constinit int f = 4;
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// CHECK-LABEL: define {{.*}}__tls_init
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// CHECK: call {{.*}} [[D_INIT]]
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// CHECK: call {{.*}} [[E2_INIT]]
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