https://github.com/kikairoya created
https://github.com/llvm/llvm-project/pull/151818
Add test for:
- shows effect of inlining member functions
- shows effect of template instantiation methods
Make cleaner a bit:
- drops unnecessary `REQUIRES` clause
- uses `%clang_cc1` instead of `%clang -Xclang`
- uses simply `-O1` instead of `-disable-O0-optnone -disable-llvm-passes`
* LTO test remains unchanged since replacing by `-O1` changes output even if
variables are anchored
>From 1c98eaa15e427e86ded5a1c706f2536d1acbafe5 Mon Sep 17 00:00:00 2001
From: kikairoya <kikair...@gmail.com>
Date: Sat, 2 Aug 2025 18:13:01 +0900
Subject: [PATCH] [Clang] Add coverage for VTable debug info
Add test for:
- shows effect of inlining member functions
- shows effect of template instantiation methods
Make cleaner a bit:
- drops unnecessary REQUIRES clause
- uses %clang_cc1 instead of %clang -Xclang
- uses simply -O1 instead of -disable-O0-optnone -disable-llvm-passes
* LTO test remains unchanged since replacing by -O1 changes output even if
variables are anchored
---
.../CodeGenCXX/vtable-debug-info-external.cpp | 93 +++++++++++++++++++
.../vtable-debug-info-inheritance-diamond.cpp | 15 +--
...vtable-debug-info-inheritance-multiple.cpp | 12 +--
...ble-debug-info-inheritance-simple-main.cpp | 2 -
.../vtable-debug-info-inheritance-simple.cpp | 9 +-
.../vtable-debug-info-inheritance-virtual.cpp | 15 +--
...able-debug-info-template-instantiation.cpp | 88 ++++++++++++++++++
7 files changed, 209 insertions(+), 25 deletions(-)
create mode 100644 clang/test/CodeGenCXX/vtable-debug-info-external.cpp
create mode 100644
clang/test/CodeGenCXX/vtable-debug-info-template-instantiation.cpp
diff --git a/clang/test/CodeGenCXX/vtable-debug-info-external.cpp
b/clang/test/CodeGenCXX/vtable-debug-info-external.cpp
new file mode 100644
index 0000000000000..c4138e720ccae
--- /dev/null
+++ b/clang/test/CodeGenCXX/vtable-debug-info-external.cpp
@@ -0,0 +1,93 @@
+// The debug info of vtable is attached conditionally to whether
+// - Member functions are inlined or not
+// - Definition of destructor is visible or not
+
+struct CInlined {
+ virtual void f1() noexcept {}
+ virtual void f2() noexcept {}
+ virtual ~CInlined() noexcept;
+};
+#ifndef NO_DTOR_BODY
+inline CInlined::~CInlined() noexcept {}
+#endif
+
+struct CNoInline {
+ virtual void g1() noexcept;
+ virtual void g2() noexcept;
+ virtual ~CNoInline() noexcept;
+};
+
+void CNoInline::g1() noexcept {}
+void CNoInline::g2() noexcept {}
+#ifndef NO_DTOR_BODY
+CNoInline::~CNoInline() noexcept {}
+#endif
+
+struct CNoFnDef {
+ virtual void h1() noexcept;
+ virtual void h2() noexcept;
+ virtual ~CNoFnDef() noexcept;
+};
+
+#ifndef NO_DTOR_BODY
+CNoFnDef::~CNoFnDef() noexcept {}
+#endif
+
+void use(void *, ...);
+
+int main() {
+ CInlined Inlined;
+ CNoInline NoInline;
+ CNoFnDef NoFnDef;
+ use(&Inlined, &NoInline, &NoFnDef);
+
+ return 0;
+}
+
+// RUN: %clang_cc1 -triple x86_64-linux -emit-llvm -debug-info-kind=limited
-dwarf-version=5 -O1 %s -o - | FileCheck %s -check-prefix CHECK-HAS-DTOR
+// RUN: %clang_cc1 -triple x86_64-linux -emit-llvm -debug-info-kind=limited
-dwarf-version=5 -O1 -DNO_DTOR_BODY %s -o - | FileCheck %s -check-prefixes
CHECK-NO-DTOR
+
+// CHECK-HAS-DTOR: $_ZTV8CInlined = comdat any
+// CHECK-HAS-DTOR-NOT: $_ZTV9CNoInline
+// CHECK-HAS-DTOR-NOT: $_ZTV8CNoFnDef
+
+// CHECK-HAS-DTOR-DAG: @_ZTV8CInlined = linkonce_odr {{.*}}constant {{{
\[[^]]*\] } { \[[^]]*\] \[[^]]*\] }}}, comdat, align 8, !dbg
[[INLINED_VTABLE_VAR:![0-9]+]]
+// CHECK-HAS-DTOR-DAG: @_ZTV9CNoInline = {{.*}}constant {{{ \[[^]]*\] } {
\[[^]]*\] \[[^]]*\] }}}, align 8, !dbg [[NOINLINE_VTABLE_VAR:![0-9]+]]
+// CHECK-HAS-DTOR-DAG: @_ZTV8CNoFnDef = external {{.*}}constant {{{ \[[^]]*\]
}}}, align 8
+
+// CHECK-HAS-DTOR: !llvm.dbg.cu
+
+// CHECK-HAS-DTOR-DAG: [[INLINED_VTABLE:![0-9]+]] = distinct
!DIGlobalVariable(name: "_vtable$", linkageName: "_ZTV8CInlined"
+// CHECK-HAS-DTOR-DAG: [[INLINED_VTABLE_VAR]] =
!DIGlobalVariableExpression(var: [[INLINED_VTABLE]], expr: !DIExpression())
+// CHECK-HAS-DTOR-DAG: [[INLINED:![0-9]+]] = distinct !DICompositeType(tag:
DW_TAG_structure_type, name: "CInlined"
+// CHECK-HAS-DTOR-DAG: !DIDerivedType(tag: DW_TAG_variable, name: "_vtable$",
scope: [[INLINED]], file: {{.*}}, baseType: {{![0-9]+}}, flags: DIFlagPrivate |
DIFlagArtificial | DIFlagStaticMember)
+
+// CHECK-HAS-DTOR-DAG: [[NOINLINE_VTABLE:![0-9]+]] = distinct
!DIGlobalVariable(name: "_vtable$", linkageName: "_ZTV9CNoInline"
+// CHECK-HAS-DTOR-DAG: [[NOINLINE_VTABLE_VAR]] =
!DIGlobalVariableExpression(var: [[NOINLINE_VTABLE]], expr: !DIExpression())
+// CHECK-HAS-DTOR-DAG: [[NOINLINE:![0-9]+]] = distinct !DICompositeType(tag:
DW_TAG_structure_type, name: "CNoInline"
+// CHECK-HAS-DTOR-DAG: !DIDerivedType(tag: DW_TAG_variable, name: "_vtable$",
scope: [[NOINLINE]], file: {{.*}}, baseType: {{![0-9]+}}, flags: DIFlagPrivate
| DIFlagArtificial | DIFlagStaticMember)
+
+// CHECK-HAS-DTOR-DAG: !llvm.ident
+
+// CHECK-HAS-DTOR-NOT: !DIGlobalVariable(name: "_vtable$", linkageName:
"_ZTV8CNoFnDef"
+
+
+// CHECK-NO-DTOR-NOT: $_ZTV8CInlined
+// CHECK-NO-DTOR-NOT: $_ZTV9CNoInline
+// CHECK-NO-DTOR-NOT: $_ZTV8CNoFnDef
+
+// CHECK-NO-DTOR-DAG: @_ZTV8CInlined = external {{.*}}constant {{.*}}, align
8{{$}}
+// CHECK-NO-DTOR-DAG: @_ZTV9CNoInline = {{.*}}constant {{{ \[[^]]*\] } {
\[[^]]*\] \[[^]]*\] }}}, align 8, !dbg [[NOINLINE_VTABLE_VAR:![0-9]+]]
+// CHECK-NO-DTOR-DAG: @_ZTV8CNoFnDef = external {{.*}}constant {{{ \[[^]]*\]
}}}, align 8, !dbg [[NOFNDEF_VTABLE_VAR:![0-9]+]]
+
+// CHECK-NO-DTOR: !llvm.dbg.cu
+
+// CHECK-NO-DTOR-DAG: [[NOINLINE_VTABLE:![0-9]+]] = distinct
!DIGlobalVariable(name: "_vtable$", linkageName: "_ZTV9CNoInline"
+// CHECK-NO-DTOR-DAG: [[NOINLINE_VTABLE_VAR]] =
!DIGlobalVariableExpression(var: [[NOINLINE_VTABLE]], expr: !DIExpression())
+// CHECK-NO-DTOR-DAG: [[NOINLINE:![0-9]+]] = distinct !DICompositeType(tag:
DW_TAG_structure_type, name: "CNoInline"
+// CHECK-NO-DTOR-DAG: !DIDerivedType(tag: DW_TAG_variable, name: "_vtable$",
scope: [[NOINLINE]], file: {{.*}}, baseType: {{![0-9]+}}, flags: DIFlagPrivate
| DIFlagArtificial | DIFlagStaticMember)
+
+// CHECK-NO-DTOR-DAG: !llvm.ident
+
+// CHECK-NO-DTOR-NOT: !DIGlobalVariable(name: "_vtable$", linkageName:
"_ZTV8CInlined"
+// CHECK-NO-DTOR-NOT: !DIGlobalVariable(name: "_vtable$", linkageName:
"_ZTV8CNoFnDef"
diff --git a/clang/test/CodeGenCXX/vtable-debug-info-inheritance-diamond.cpp
b/clang/test/CodeGenCXX/vtable-debug-info-inheritance-diamond.cpp
index 5ed1353eebb10..53a24a2d1b15e 100644
--- a/clang/test/CodeGenCXX/vtable-debug-info-inheritance-diamond.cpp
+++ b/clang/test/CodeGenCXX/vtable-debug-info-inheritance-diamond.cpp
@@ -1,5 +1,3 @@
-// REQUIRES: target={{x86_64.*-linux.*}}
-
// Diamond inheritance case:
// For CBase, CLeft, CRight and CDerived we check:
// - Generation of their vtables (including attributes).
@@ -35,26 +33,29 @@ struct CDerived : NSP_1::CLeft, NSP_2::CRight {
int fooDerived() { return 3; };
};
+void use(void *, ...);
+
int main() {
NSP::CBase Base;
NSP_1::CLeft Left;
NSP_2::CRight Right;
CDerived Derived;
+ use(&Base, &Left, &Right, &Derived);
return 0;
}
-// RUN: %clang --target=x86_64-linux -Xclang -disable-O0-optnone -Xclang
-disable-llvm-passes -emit-llvm -S -g %s -o - | FileCheck %s
+// RUN: %clang_cc1 -triple x86_64-linux -emit-llvm -debug-info-kind=limited
-dwarf-version=5 -O1 %s -o - | FileCheck %s
// CHECK: $_ZTVN3NSP5CBaseE = comdat any
// CHECK: $_ZTVN5NSP_15CLeftE = comdat any
// CHECK: $_ZTVN5NSP_26CRightE = comdat any
// CHECK: $_ZTV8CDerived = comdat any
-// CHECK: @_ZTVN3NSP5CBaseE = linkonce_odr {{dso_local|hidden}} unnamed_addr
constant {{.*}}, comdat, align 8, !dbg [[BASE_VTABLE_VAR:![0-9]*]]
-// CHECK: @_ZTVN5NSP_15CLeftE = linkonce_odr {{dso_local|hidden}} unnamed_addr
constant {{.*}}, comdat, align 8, !dbg [[LEFT_VTABLE_VAR:![0-9]*]]
-// CHECK: @_ZTVN5NSP_26CRightE = linkonce_odr {{dso_local|hidden}}
unnamed_addr constant {{.*}}, comdat, align 8, !dbg [[RIGHT_VTABLE_VAR:![0-9]*]]
-// CHECK: @_ZTV8CDerived = linkonce_odr {{dso_local|hidden}} unnamed_addr
constant {{.*}}, comdat, align 8, !dbg [[DERIVED_VTABLE_VAR:![0-9]*]]
+// CHECK: @_ZTVN3NSP5CBaseE = linkonce_odr {{.*}}unnamed_addr constant {{.*}},
comdat, align 8, !dbg [[BASE_VTABLE_VAR:![0-9]*]]
+// CHECK: @_ZTVN5NSP_15CLeftE = linkonce_odr {{.*}}unnamed_addr constant
{{.*}}, comdat, align 8, !dbg [[LEFT_VTABLE_VAR:![0-9]*]]
+// CHECK: @_ZTVN5NSP_26CRightE = linkonce_odr {{.*}}unnamed_addr constant
{{.*}}, comdat, align 8, !dbg [[RIGHT_VTABLE_VAR:![0-9]*]]
+// CHECK: @_ZTV8CDerived = linkonce_odr {{.*}}unnamed_addr constant {{.*}},
comdat, align 8, !dbg [[DERIVED_VTABLE_VAR:![0-9]*]]
// CHECK: [[BASE_VTABLE_VAR]] = !DIGlobalVariableExpression(var:
[[BASE_VTABLE:![0-9]*]], expr: !DIExpression())
// CHECK-NEXT: [[BASE_VTABLE]] = distinct !DIGlobalVariable(name: "_vtable$",
linkageName: "_ZTVN3NSP5CBaseE"
diff --git a/clang/test/CodeGenCXX/vtable-debug-info-inheritance-multiple.cpp
b/clang/test/CodeGenCXX/vtable-debug-info-inheritance-multiple.cpp
index 23973a35d0e17..69fa096324651 100644
--- a/clang/test/CodeGenCXX/vtable-debug-info-inheritance-multiple.cpp
+++ b/clang/test/CodeGenCXX/vtable-debug-info-inheritance-multiple.cpp
@@ -1,5 +1,3 @@
-// REQUIRES: target={{x86_64.*-linux.*}}
-
// Multiple inheritance case:
// For CBaseOne, CBaseTwo and CDerived we check:
// - Generation of their vtables (including attributes).
@@ -30,23 +28,25 @@ struct CDerived : NSP_1::CBaseOne, NSP_2::CBaseTwo {
int six() override { return 66; }
};
+void use(void *, ...);
int main() {
NSP_1::CBaseOne BaseOne;
NSP_2::CBaseTwo BaseTwo;
CDerived Derived;
+ use(&BaseOne, &BaseTwo, &Derived);
return 0;
}
-// RUN: %clang --target=x86_64-linux -Xclang -disable-O0-optnone -Xclang
-disable-llvm-passes -emit-llvm -S -g %s -o - | FileCheck %s
+// RUN: %clang_cc1 -triple x86_64-linux -emit-llvm -debug-info-kind=limited
-dwarf-version=5 -O1 %s -o - | FileCheck %s
// CHECK: $_ZTVN5NSP_18CBaseOneE = comdat any
// CHECK: $_ZTVN5NSP_28CBaseTwoE = comdat any
// CHECK: $_ZTV8CDerived = comdat any
-// CHECK: @_ZTVN5NSP_18CBaseOneE = linkonce_odr {{dso_local|hidden}}
unnamed_addr constant {{.*}}, comdat, align 8, !dbg
[[BASE_ONE_VTABLE_VAR:![0-9]*]]
-// CHECK: @_ZTVN5NSP_28CBaseTwoE = linkonce_odr {{dso_local|hidden}}
unnamed_addr constant {{.*}}, comdat, align 8, !dbg
[[BASE_TWO_VTABLE_VAR:![0-9]*]]
-// CHECK: @_ZTV8CDerived = linkonce_odr {{dso_local|hidden}} unnamed_addr
constant {{.*}}, comdat, align 8, !dbg [[DERIVED_VTABLE_VAR:![0-9]*]]
+// CHECK: @_ZTVN5NSP_18CBaseOneE = linkonce_odr {{.*}}unnamed_addr constant
{{.*}}, comdat, align 8, !dbg [[BASE_ONE_VTABLE_VAR:![0-9]*]]
+// CHECK: @_ZTVN5NSP_28CBaseTwoE = linkonce_odr {{.*}}unnamed_addr constant
{{.*}}, comdat, align 8, !dbg [[BASE_TWO_VTABLE_VAR:![0-9]*]]
+// CHECK: @_ZTV8CDerived = linkonce_odr {{.*}}unnamed_addr constant {{.*}},
comdat, align 8, !dbg [[DERIVED_VTABLE_VAR:![0-9]*]]
// CHECK: [[BASE_ONE_VTABLE_VAR]] = !DIGlobalVariableExpression(var:
[[BASE_ONE_VTABLE:![0-9]*]], expr: !DIExpression())
// CHECK-NEXT: [[BASE_ONE_VTABLE]] = distinct !DIGlobalVariable(name:
"_vtable$", linkageName: "_ZTVN5NSP_18CBaseOneE"
diff --git
a/clang/test/CodeGenCXX/vtable-debug-info-inheritance-simple-main.cpp
b/clang/test/CodeGenCXX/vtable-debug-info-inheritance-simple-main.cpp
index d64e711dddfa0..5d93719b60699 100644
--- a/clang/test/CodeGenCXX/vtable-debug-info-inheritance-simple-main.cpp
+++ b/clang/test/CodeGenCXX/vtable-debug-info-inheritance-simple-main.cpp
@@ -1,5 +1,3 @@
-// REQUIRES: target={{x86_64.*-linux.*}}
-
// Simple inheritance case:
// For CBase and CDerived we check:
// - Generation of their vtables (including attributes).
diff --git a/clang/test/CodeGenCXX/vtable-debug-info-inheritance-simple.cpp
b/clang/test/CodeGenCXX/vtable-debug-info-inheritance-simple.cpp
index 249586f5991f1..a0485f48ab8b8 100644
--- a/clang/test/CodeGenCXX/vtable-debug-info-inheritance-simple.cpp
+++ b/clang/test/CodeGenCXX/vtable-debug-info-inheritance-simple.cpp
@@ -23,20 +23,23 @@ struct CDerived : NSP::CBase {
int three() override { return 33; }
};
+void use(void *, ...);
+
int main() {
NSP::CBase Base;
CDerived Derived;
+ use(&Base, &Derived);
return 0;
}
-// RUN: %clang --target=x86_64-linux -Xclang -disable-O0-optnone -Xclang
-disable-llvm-passes -emit-llvm -S -g %s -o - | FileCheck %s
+// RUN: %clang_cc1 -triple x86_64-linux -emit-llvm -debug-info-kind=limited
-dwarf-version=5 -O1 %s -o - | FileCheck %s
// CHECK: $_ZTVN3NSP5CBaseE = comdat any
// CHECK: $_ZTV8CDerived = comdat any
-// CHECK: @_ZTVN3NSP5CBaseE = linkonce_odr {{dso_local|hidden}} unnamed_addr
constant {{.*}}, comdat, align 8, !dbg [[BASE_VTABLE_VAR:![0-9]*]]
-// CHECK: @_ZTV8CDerived = linkonce_odr {{dso_local|hidden}} unnamed_addr
constant {{.*}}, comdat, align 8, !dbg [[DERIVED_VTABLE_VAR:![0-9]*]]
+// CHECK: @_ZTVN3NSP5CBaseE = linkonce_odr {{.*}}unnamed_addr constant {{.*}},
comdat, align 8, !dbg [[BASE_VTABLE_VAR:![0-9]*]]
+// CHECK: @_ZTV8CDerived = linkonce_odr {{.*}}unnamed_addr constant {{.*}},
comdat, align 8, !dbg [[DERIVED_VTABLE_VAR:![0-9]*]]
// CHECK: [[BASE_VTABLE_VAR]] = !DIGlobalVariableExpression(var:
[[BASE_VTABLE:![0-9]*]], expr: !DIExpression())
// CHECK-NEXT: [[BASE_VTABLE]] = distinct !DIGlobalVariable(name: "_vtable$",
linkageName: "_ZTVN3NSP5CBaseE"
diff --git a/clang/test/CodeGenCXX/vtable-debug-info-inheritance-virtual.cpp
b/clang/test/CodeGenCXX/vtable-debug-info-inheritance-virtual.cpp
index b01f156b7f654..fc8c15aabd616 100644
--- a/clang/test/CodeGenCXX/vtable-debug-info-inheritance-virtual.cpp
+++ b/clang/test/CodeGenCXX/vtable-debug-info-inheritance-virtual.cpp
@@ -1,5 +1,3 @@
-// REQUIRES: target={{x86_64.*-linux.*}}
-
// Virtual inheritance case:
// For CBase, CLeft, CRight and CDerived we check:
// - Generation of their vtables (including attributes).
@@ -35,26 +33,29 @@ struct CDerived : NSP_1::CLeft, NSP_2::CRight {
int fooDerived() { return 3; };
};
+void use(void *, ...);
+
int main() {
NSP::CBase Base;
NSP_1::CLeft Left;
NSP_2::CRight Right;
CDerived Derived;
+ use(&Base, &Left, &Right, &Derived);
return 0;
}
-// RUN: %clang --target=x86_64-linux -Xclang -disable-O0-optnone -Xclang
-disable-llvm-passes -emit-llvm -S -g %s -o - | FileCheck %s
+// RUN: %clang_cc1 -triple x86_64-linux -emit-llvm -debug-info-kind=limited
-dwarf-version=5 -O1 %s -o - | FileCheck %s
// CHECK: $_ZTVN3NSP5CBaseE = comdat any
// CHECK: $_ZTVN5NSP_15CLeftE = comdat any
// CHECK: $_ZTVN5NSP_26CRightE = comdat any
// CHECK: $_ZTV8CDerived = comdat any
-// CHECK: @_ZTVN3NSP5CBaseE = linkonce_odr {{dso_local|hidden}} unnamed_addr
constant {{.*}}, comdat, align 8, !dbg [[BASE_VTABLE_VAR:![0-9]*]]
-// CHECK: @_ZTVN5NSP_15CLeftE = linkonce_odr {{dso_local|hidden}} unnamed_addr
constant {{.*}}, comdat, align 8, !dbg [[LEFT_VTABLE_VAR:![0-9]*]]
-// CHECK: @_ZTVN5NSP_26CRightE = linkonce_odr {{dso_local|hidden}}
unnamed_addr constant {{.*}}, comdat, align 8, !dbg [[RIGHT_VTABLE_VAR:![0-9]*]]
-// CHECK: @_ZTV8CDerived = linkonce_odr {{dso_local|hidden}} unnamed_addr
constant {{.*}}, comdat, align 8, !dbg [[DERIVED_VTABLE_VAR:![0-9]*]]
+// CHECK: @_ZTVN3NSP5CBaseE = linkonce_odr {{.*}}unnamed_addr constant {{.*}},
comdat, align 8, !dbg [[BASE_VTABLE_VAR:![0-9]*]]
+// CHECK: @_ZTVN5NSP_15CLeftE = linkonce_odr {{.*}}unnamed_addr constant
{{.*}}, comdat, align 8, !dbg [[LEFT_VTABLE_VAR:![0-9]*]]
+// CHECK: @_ZTVN5NSP_26CRightE = linkonce_odr {{.*}}unnamed_addr constant
{{.*}}, comdat, align 8, !dbg [[RIGHT_VTABLE_VAR:![0-9]*]]
+// CHECK: @_ZTV8CDerived = linkonce_odr {{.*}}unnamed_addr constant {{.*}},
comdat, align 8, !dbg [[DERIVED_VTABLE_VAR:![0-9]*]]
// CHECK: [[BASE_VTABLE_VAR]] = !DIGlobalVariableExpression(var:
[[BASE_VTABLE:![0-9]*]], expr: !DIExpression())
// CHECK-NEXT: [[BASE_VTABLE]] = distinct !DIGlobalVariable(name: "_vtable$",
linkageName: "_ZTVN3NSP5CBaseE"
diff --git a/clang/test/CodeGenCXX/vtable-debug-info-template-instantiation.cpp
b/clang/test/CodeGenCXX/vtable-debug-info-template-instantiation.cpp
new file mode 100644
index 0000000000000..2f02861c7f465
--- /dev/null
+++ b/clang/test/CodeGenCXX/vtable-debug-info-template-instantiation.cpp
@@ -0,0 +1,88 @@
+// For CTemplate we check in case of:
+// - Implicitly instantiate whole class by up-casting:
+// * The vtable is generated with comdat
+// * Its '_vtable$' is generated
+// - Implicitly instantiate member function only:
+// * The vtable is NOT generated
+// * Its '_vtable$' is generated
+// - Define explicitly instantiation:
+// * The vtable is generated with comdat
+// * Its '_vtable$' is generated
+// - Declare explicitly instantiation as extern:
+// # for COFF targets:
+// * The vtable is declared but NOT associated with '_vtable$'
+// # for non-COFF targets:
+// * The vtable is declared
+// * Its '_vtable$' is generated
+
+struct CBase {
+ virtual void f() noexcept {}
+};
+
+template <typename T>
+struct CTemplate: CBase {
+ void f() noexcept override;
+ virtual ~CTemplate() noexcept;
+};
+template <typename T>
+void CTemplate<T>::f() noexcept {}
+template <typename T>
+CTemplate<T>::~CTemplate() noexcept {}
+
+#ifdef EXPLICIT
+template struct CTemplate<void>;
+#endif
+#ifdef EXTERN
+extern template struct CTemplate<void>;
+#endif
+
+CTemplate<void> *get(CBase *) noexcept;
+
+int main() {
+ CTemplate<void> Template;
+#ifdef NOCAST
+ get(nullptr)->f();
+#else
+ get(&Template)->f();
+#endif
+
+ return 0;
+}
+
+// RUN: %clang_cc1 -triple x86_64-linux -emit-llvm -debug-info-kind=limited
-dwarf-version=5 -O1 %s -o - | FileCheck %s -check-prefix IMPLICIT
+// RUN: %clang_cc1 -triple x86_64-linux -emit-llvm -debug-info-kind=limited
-dwarf-version=5 -O1 %s -o - -DNOCAST | FileCheck %s -check-prefix NOCAST
+// RUN: %clang_cc1 -triple x86_64-linux -emit-llvm -debug-info-kind=limited
-dwarf-version=5 -O1 %s -o - -DEXPLICIT | FileCheck %s -check-prefix EXPLICIT
+// RUN: %clang_cc1 -triple x86_64-linux -emit-llvm -debug-info-kind=limited
-dwarf-version=5 -O1 %s -o - -DEXTERN | FileCheck %s -check-prefix EXTERN
+
+// IMPLICIT: $_ZTV9CTemplateIvE = comdat any
+// IMPLICIT: @_ZTV9CTemplateIvE = linkonce_odr {{.*}}unnamed_addr constant
{{.*}}, comdat, align 8, !dbg [[VTABLE_VAR:![0-9]*]]
+// IMPLICIT-DAG: [[VTABLE:![0-9]+]] = distinct !DIGlobalVariable(name:
"_vtable$", linkageName: "_ZTV9CTemplateIvE"
+// IMPLICIT-DAG: !DIGlobalVariableExpression(var: [[VTABLE]], expr:
!DIExpression())
+// IMPLICIT-DAG: [[TYPE:![0-9]+]] = distinct !DICompositeType(tag:
DW_TAG_structure_type, name: "CTemplate<void>"
+// IMPLICIT-DAG: !DIDerivedType(tag: DW_TAG_variable, name: "_vtable$", scope:
[[TYPE]], file: {{.*}}, baseType: [[PVOID:![0-9]+]], flags: DIFlagPrivate |
DIFlagArtificial | DIFlagStaticMember)
+// IMPLICIT-DAG: [[PVOID]] = !DIDerivedType(tag: DW_TAG_pointer_type,
baseType: null, size: 64)
+
+// NOCAST-NOT: $_ZTV9CTemplateIvE
+// NOCAST-NOT: @_ZTV9CTemplateIvE
+// NOCAST-DAG: [[VTABLE:![0-9]+]] = distinct !DIGlobalVariable(name:
"_vtable$", linkageName: "_ZTV9CTemplateIvE"
+// NOCAST-DAG: !DIGlobalVariableExpression(var: [[VTABLE]], expr:
!DIExpression())
+// NOCAST-DAG: [[TYPE:![0-9]+]] = distinct !DICompositeType(tag:
DW_TAG_structure_type, name: "CTemplate<void>"
+// NOCAST-DAG: !DIDerivedType(tag: DW_TAG_variable, name: "_vtable$", scope:
[[TYPE]], file: {{.*}}, baseType: [[PVOID:![0-9]+]], flags: DIFlagPrivate |
DIFlagArtificial | DIFlagStaticMember)
+// NOCAST-DAG: [[PVOID]] = !DIDerivedType(tag: DW_TAG_pointer_type, baseType:
null, size: 64)
+
+// EXPLICIT: $_ZTV9CTemplateIvE = comdat any
+// EXPLICIT: @_ZTV9CTemplateIvE = weak_odr {{.*}}unnamed_addr constant {{.*}},
comdat, align 8, !dbg [[VTABLE_VAR:![0-9]*]]
+// EXPLICIT-DAG: [[VTABLE:![0-9]+]] = distinct !DIGlobalVariable(name:
"_vtable$", linkageName: "_ZTV9CTemplateIvE"
+// EXPLICIT-DAG: [[VTABLE_VAR]] = !DIGlobalVariableExpression(var: [[VTABLE]],
expr: !DIExpression())
+// EXPLICIT-DAG: [[TYPE:![0-9]+]] = distinct !DICompositeType(tag:
DW_TAG_structure_type, name: "CTemplate<void>"
+// EXPLICIT-DAG: !DIDerivedType(tag: DW_TAG_variable, name: "_vtable$", scope:
[[TYPE]], file: {{.*}}, baseType: [[PVOID:![0-9]+]], flags: DIFlagPrivate |
DIFlagArtificial | DIFlagStaticMember)
+// EXPLICIT-DAG: [[PVOID]] = !DIDerivedType(tag: DW_TAG_pointer_type,
baseType: null, size: 64)
+
+// EXTERN-NOT: $_ZTV9CTemplateIvE
+// EXTERN: @_ZTV9CTemplateIvE = external {{.*}}unnamed_addr constant {{.*}},
align 8, !dbg [[VTABLE_VAR:![0-9]*]]
+// EXTERN-DAG: [[VTABLE:![0-9]+]] = distinct !DIGlobalVariable(name:
"_vtable$", linkageName: "_ZTV9CTemplateIvE"
+// EXTERN-DAG: [[VTABLE_VAR]] = !DIGlobalVariableExpression(var: [[VTABLE]],
expr: !DIExpression())
+// EXTERN-DAG: [[TYPE:![0-9]+]] = !DICompositeType(tag: DW_TAG_structure_type,
name: "CTemplate<void>"
+// EXTERN-DAG: !DIDerivedType(tag: DW_TAG_variable, name: "_vtable$", scope:
[[TYPE]], file: {{.*}}, baseType: [[PVOID:![0-9]+]], flags: DIFlagPrivate |
DIFlagArtificial | DIFlagStaticMember)
+// EXTERN-DAG: [[PVOID]] = !DIDerivedType(tag: DW_TAG_pointer_type, baseType:
null, size: 64)
+
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