bf6d24a34d
The previous approach broke the instantiation convention for templated substitutions, as we were attempting to instantiate the initializer even when it was still dependent. We deferred variable template instantiation until the end of the TU. However, type deduction requires the initializer immediately, similar to how constant evaluation does. Fixes https://github.com/llvm/llvm-project/issues/140773 Fixes #135032 Fixes #134526 Reapplies https://github.com/llvm/llvm-project/pull/138122
152 lines
4.6 KiB
C++
152 lines
4.6 KiB
C++
// RUN: %clang_cc1 -std=c++1z %s -emit-llvm -o - -triple x86_64-linux-gnu | FileCheck %s
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template <typename T> struct InlineAuto {
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template <typename G> inline static auto var = 5;
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};
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int inlineauto = InlineAuto<int>::var<int>;
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// CHECK: @_ZN10InlineAutoIiE3varIiEE = {{.*}}i32 5{{.*}}comdat
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template <typename> struct PartialInlineAuto {
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template <typename, typename> inline static auto var = 6;
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template <typename T> inline static auto var<int, T> = 7;
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};
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int partialinlineauto = PartialInlineAuto<int>::var<int, int>;
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// CHECK: @_ZN17PartialInlineAutoIiE3varIiiEE = {{.*}}i32 7{{.*}}comdat
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struct Q {
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// CHECK: @_ZN1Q1kE = linkonce_odr constant i32 5, comdat
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static constexpr int k = 5;
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};
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const int &r = Q::k;
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int f();
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// const does not imply internal linkage.
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// CHECK: @external_inline = linkonce_odr constant i32 5, comdat
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inline const int external_inline = 5;
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const int &use1 = external_inline;
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// static still does, though.
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// CHECK: @_ZL15internal_inline = internal constant i32 5
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static inline const int internal_inline = 5;
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const int &use2 = internal_inline;
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int a = f();
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// CHECK: @b = linkonce_odr global i32 0, comdat
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// CHECK: @_ZGV1b = linkonce_odr global i64 0, comdat($b)
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inline int b = f();
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int c = f();
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// For compatibility with C++11 and C++14, an out-of-line declaration of a
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// static constexpr local variable promotes the variable to weak_odr.
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struct compat {
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static constexpr int a = 1;
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static constexpr int b = 2;
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static constexpr int c = 3;
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static inline constexpr int d = 4;
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static const int e = 5;
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static const int f = 6;
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static const int g = 7;
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};
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const int &compat_use_before_redecl = compat::b;
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const int compat::a;
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const int compat::b;
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const int compat::c;
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const int compat::d;
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const int compat::e;
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constexpr int compat::f;
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constexpr inline int compat::g;
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const int &compat_use_after_redecl1 = compat::c;
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const int &compat_use_after_redecl2 = compat::d;
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const int &compat_use_after_redecl3 = compat::g;
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// CHECK-DAG: @_ZN6compat1bE = weak_odr constant i32 2
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// CHECK-DAG: @_ZN6compat1aE = weak_odr constant i32 1
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// CHECK-DAG: @_ZN6compat1cE = weak_odr constant i32 3
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// CHECK-DAG: @_ZN6compat1dE = linkonce_odr constant i32 4
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// CHECK-DAG: @_ZN6compat1eE ={{.*}} constant i32 5
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// CHECK-DAG: @_ZN6compat1fE = weak_odr constant i32 6
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// CHECK-DAG: @_ZN6compat1gE = linkonce_odr constant i32 7
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template<typename T> struct X {
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static int a;
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static inline int b;
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static int c;
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static const int d;
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static int e;
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};
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// CHECK: @_ZN1XIiE1aE = linkonce_odr global i32 10
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// CHECK: @_ZN1XIiE1bE ={{.*}} global i32 20
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// CHECK-NOT: @_ZN1XIiE1cE
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// CHECK: @_ZN1XIiE1dE = linkonce_odr constant i32 40
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// CHECK: @_ZN1XIiE1eE = linkonce_odr global i32 50
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template<> inline int X<int>::a = 10;
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int &use3 = X<int>::a;
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template<> int X<int>::b = 20;
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template<> inline int X<int>::c = 30;
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template<typename T> constexpr int X<T>::d = 40;
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template<typename T> inline int X<T>::e = 50;
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const int *use_x_int_d = &X<int>::d;
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const int *use_x_int_e = &X<int>::e;
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template<typename T> struct Y;
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template<> struct Y<int> {
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static constexpr int a = 123;
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static constexpr int b = 456;
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static constexpr int c = 789;
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};
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// CHECK: @_ZN1YIiE1aE = weak_odr constant i32 123
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constexpr int Y<int>::a;
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// CHECK: @_ZN1YIiE1bE = linkonce_odr constant i32 456
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const int &yib = Y<int>::b;
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// CHECK-NOT: @_ZN1YIiE1cE
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// CHECK-LABEL: define {{.*}}global_var_init
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// CHECK: call noundef i32 @_Z1fv
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// CHECK-LABEL: define {{.*}}global_var_init{{.*}} comdat($b)
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// CHECK: load atomic {{.*}} acquire, align
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// CHECK: br
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// CHECK: __cxa_guard_acquire(ptr @_ZGV1b)
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// CHECK: br
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// CHECK: call noundef i32 @_Z1fv
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// CHECK: __cxa_guard_release(ptr @_ZGV1b)
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// CHECK-LABEL: define {{.*}}global_var_init
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// CHECK: call noundef i32 @_Z1fv
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template<typename T> inline int d = f();
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int e = d<int>;
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// CHECK-LABEL: define {{.*}}global_var_init{{.*}}comdat
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// CHECK: _ZGV1dIiE
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// CHECK-NOT: __cxa_guard_acquire(ptr @_ZGV1b)
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// CHECK: call noundef i32 @_Z1fv
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// CHECK-NOT: __cxa_guard_release(ptr @_ZGV1b)
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namespace PR35599 {
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struct Marker1 {};
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struct Marker2 {};
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template <typename>
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struct Foo {
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struct Bar { Bar(); };
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inline static Bar bar;
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};
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void run() {
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// All we want here are ODR uses. Anything that requires that the type is
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// complete is uninteresting.
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#pragma clang diagnostic push
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#pragma clang diagnostic ignored "-Wunused-value"
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Foo<Marker1>::bar;
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#pragma clang diagnostic pop
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static_cast<void>(Foo<Marker2>::bar);
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}
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// CHECK-LABEL: define {{.*}}global_var_init{{.*}}comdat
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// CHECK: call void @_ZN7PR355993FooINS_7Marker1EE3BarC1Ev
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// CHECK-LABEL: define {{.*}}global_var_init{{.*}}comdat
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// CHECK: call void @_ZN7PR355993FooINS_7Marker2EE3BarC1Ev
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}
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