forked from OSchip/llvm-project
219 lines
7.9 KiB
C++
219 lines
7.9 KiB
C++
// RUN: %clang_cc1 -fno-rtti %s -emit-llvm -o %t -triple=i386-pc-win32 -fdump-vtable-layouts 2>&1 | FileCheck --check-prefix=VFTABLES %s
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// RUN: FileCheck --check-prefix=GLOBALS %s < %t
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// RUN: FileCheck --check-prefix=CODEGEN %s < %t
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namespace test1 {
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// Some covariant types.
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struct A { int a; };
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struct B { int b; };
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struct C : A, B { int c; };
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struct D : C { int d; };
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struct E : D { int e; };
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// One base class and two overrides, all with covariant return types.
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struct H { virtual B *foo(); };
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struct I : H { virtual C *foo(); };
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struct J : I { virtual D *foo(); J(); };
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struct K : J { virtual E *foo(); K(); };
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J::J() {}
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// VFTABLES-LABEL: VFTable for 'test1::H' in 'test1::I' in 'test1::J' (3 entries).
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// VFTABLES-NEXT: 0 | test1::D *test1::J::foo()
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// VFTABLES-NEXT: [return adjustment (to type 'struct test1::B *'): 4 non-virtual]
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// VFTABLES-NEXT: 1 | test1::D *test1::J::foo()
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// VFTABLES-NEXT: [return adjustment (to type 'struct test1::C *'): 0 non-virtual]
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// VFTABLES-NEXT: 2 | test1::D *test1::J::foo()
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// GLOBALS-LABEL: @"??_7J@test1@@6B@" = linkonce_odr unnamed_addr constant { [3 x i8*] }
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// GLOBALS: @"?foo@J@test1@@QAEPAUB@2@XZ"
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// GLOBALS: @"?foo@J@test1@@QAEPAUC@2@XZ"
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// GLOBALS: @"?foo@J@test1@@UAEPAUD@2@XZ"
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K::K() {}
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// VFTABLES-LABEL: VFTable for 'test1::H' in 'test1::I' in 'test1::J' in 'test1::K' (4 entries).
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// VFTABLES-NEXT: 0 | test1::E *test1::K::foo()
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// VFTABLES-NEXT: [return adjustment (to type 'struct test1::B *'): 4 non-virtual]
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// VFTABLES-NEXT: 1 | test1::E *test1::K::foo()
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// VFTABLES-NEXT: [return adjustment (to type 'struct test1::C *'): 0 non-virtual]
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// VFTABLES-NEXT: 2 | test1::E *test1::K::foo()
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// VFTABLES-NEXT: [return adjustment (to type 'struct test1::D *'): 0 non-virtual]
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// VFTABLES-NEXT: 3 | test1::E *test1::K::foo()
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// Only B to C requires adjustment, but we get 3 thunks in K's vftable, two of
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// which are trivial.
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// GLOBALS-LABEL: @"??_7K@test1@@6B@" = linkonce_odr unnamed_addr constant { [4 x i8*] }
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// GLOBALS: @"?foo@K@test1@@QAEPAUB@2@XZ"
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// GLOBALS: @"?foo@K@test1@@QAEPAUC@2@XZ"
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// GLOBALS: @"?foo@K@test1@@QAEPAUD@2@XZ"
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// GLOBALS: @"?foo@K@test1@@UAEPAUE@2@XZ"
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// This thunk has a return adjustment.
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// CODEGEN-LABEL: define {{.*}} @"?foo@K@test1@@QAEPAUB@2@XZ"
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// CODEGEN: call {{.*}} @"?foo@K@test1@@UAEPAUE@2@XZ"
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// CODEGEN: icmp {{.*}}, null
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// CODEGEN: getelementptr
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// CODEGEN: ret
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// These two don't.
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// CODEGEN-LABEL: define {{.*}} @"?foo@K@test1@@QAEPAUC@2@XZ"
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// CODEGEN: call {{.*}} @"?foo@K@test1@@UAEPAUE@2@XZ"
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// CODEGEN-NEXT: ret
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// CODEGEN-LABEL: define {{.*}} @"?foo@K@test1@@QAEPAUD@2@XZ"
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// CODEGEN: call {{.*}} @"?foo@K@test1@@UAEPAUE@2@XZ"
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// CODEGEN-NEXT: ret
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}
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namespace test2 {
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// Covariant types. D* is not trivially convertible to C*.
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struct A { int a; };
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struct B { int b; };
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struct C : B { int c; };
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struct D : A, C { int d; };
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struct E : D { int e; };
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// J's foo will require an adjusting thunk, and K will require a trivial thunk.
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struct H { virtual B *foo(); };
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struct I : H { virtual C *foo(); };
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struct J : I { virtual D *foo(); J(); };
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struct K : J { virtual E *foo(); K(); };
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J::J() {}
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// VFTABLES-LABEL: VFTable for 'test2::H' in 'test2::I' in 'test2::J' (2 entries).
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// VFTABLES-NEXT: 0 | test2::D *test2::J::foo()
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// VFTABLES-NEXT: [return adjustment (to type 'struct test2::B *'): 4 non-virtual]
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// VFTABLES-NEXT: 1 | test2::D *test2::J::foo()
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// GLOBALS-LABEL: @"??_7J@test2@@6B@" = linkonce_odr unnamed_addr constant { [2 x i8*] }
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K::K() {}
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// VFTABLES-LABEL: VFTable for 'test2::H' in 'test2::I' in 'test2::J' in 'test2::K' (3 entries).
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// VFTABLES-NEXT: 0 | test2::E *test2::K::foo()
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// VFTABLES-NEXT: [return adjustment (to type 'struct test2::B *'): 4 non-virtual]
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// VFTABLES-NEXT: 1 | test2::E *test2::K::foo()
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// VFTABLES-NEXT: [return adjustment (to type 'struct test2::D *'): 0 non-virtual]
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// VFTABLES-NEXT: 2 | test2::E *test2::K::foo()
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// GLOBALS-LABEL: @"??_7K@test2@@6B@" = linkonce_odr unnamed_addr constant { [3 x i8*] }
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}
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namespace pr20479 {
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struct A {
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virtual A *f();
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};
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struct B : virtual A {
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virtual B *f();
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};
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struct C : virtual A, B {
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// VFTABLES-LABEL: VFTable for 'pr20479::A' in 'pr20479::B' in 'pr20479::C' (2 entries).
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// VFTABLES-NEXT: 0 | pr20479::B *pr20479::B::f()
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// VFTABLES-NEXT: [return adjustment (to type 'struct pr20479::A *'): vbase #1, 0 non-virtual]
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// VFTABLES-NEXT: 1 | pr20479::B *pr20479::B::f()
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C();
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};
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C::C() {}
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// GLOBALS-LABEL: @"??_7C@pr20479@@6B@" = linkonce_odr unnamed_addr constant { [2 x i8*] }
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// GLOBALS: @"?f@B@pr20479@@QAEPAUA@2@XZ"
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// GLOBALS: @"?f@B@pr20479@@UAEPAU12@XZ"
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}
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namespace pr21073 {
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struct A {
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virtual A *f();
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};
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struct B : virtual A {
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virtual B *f();
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};
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struct C : virtual A, virtual B {
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// VFTABLES-LABEL: VFTable for 'pr21073::A' in 'pr21073::B' in 'pr21073::C' (2 entries).
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// VFTABLES-NEXT: 0 | pr21073::B *pr21073::B::f()
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// VFTABLES-NEXT: [return adjustment (to type 'struct pr21073::A *'): vbase #1, 0 non-virtual]
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// VFTABLES-NEXT: [this adjustment: 8 non-virtual]
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// VFTABLES-NEXT: 1 | pr21073::B *pr21073::B::f()
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// VFTABLES-NEXT: [return adjustment (to type 'struct pr21073::B *'): 0 non-virtual]
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// VFTABLES-NEXT: [this adjustment: 8 non-virtual]
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C();
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};
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C::C() {}
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// GLOBALS-LABEL: @"??_7C@pr21073@@6B@" = linkonce_odr unnamed_addr constant { [2 x i8*] }
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// GLOBALS: @"?f@B@pr21073@@WPPPPPPPI@AEPAUA@2@XZ"
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// GLOBALS: @"?f@B@pr21073@@WPPPPPPPI@AEPAU12@XZ"
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}
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namespace pr21073_2 {
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struct A { virtual A *foo(); };
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struct B : virtual A {};
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struct C : virtual A { virtual C *foo(); };
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struct D : B, C { D(); };
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D::D() {}
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// VFTABLES-LABEL: VFTable for 'pr21073_2::A' in 'pr21073_2::C' in 'pr21073_2::D' (2 entries)
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// VFTABLES-NEXT: 0 | pr21073_2::C *pr21073_2::C::foo()
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// VFTABLES-NEXT: [return adjustment (to type 'struct pr21073_2::A *'): vbase #1, 0 non-virtual]
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// VFTABLES-NEXT: 1 | pr21073_2::C *pr21073_2::C::foo()
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// GLOBALS-LABEL: @"??_7D@pr21073_2@@6B@" = {{.*}} constant { [2 x i8*] }
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// GLOBALS: @"?foo@C@pr21073_2@@QAEPAUA@2@XZ"
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// GLOBALS: @"?foo@C@pr21073_2@@UAEPAU12@XZ"
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}
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namespace test3 {
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struct A { virtual A *fn(); };
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struct B : virtual A { virtual B *fn(); };
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struct X : virtual B {};
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struct Y : virtual B {};
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struct C : X, Y {};
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struct D : virtual B, virtual A, C {
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D *fn();
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D();
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};
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D::D() {}
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// VFTABLES-LABEL: VFTable for 'test3::A' in 'test3::B' in 'test3::X' in 'test3::C' in 'test3::D' (3 entries).
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// VFTABLES-NEXT: 0 | test3::D *test3::D::fn()
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// VFTABLES-NEXT: [return adjustment (to type 'struct test3::A *'): vbase #1, 0 non-virtual]
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// VFTABLES-NEXT: [this adjustment: vtordisp at -4, 0 non-virtual]
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// VFTABLES-NEXT: 1 | test3::D *test3::D::fn()
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// VFTABLES-NEXT: [return adjustment (to type 'struct test3::B *'): vbase #2, 0 non-virtual]
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// VFTABLES-NEXT: [this adjustment: vtordisp at -4, 0 non-virtual]
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// VFTABLES-NEXT: 2 | test3::D *test3::D::fn()
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// VFTABLES-NEXT: [return adjustment (to type 'struct test3::D *'): 0 non-virtual]
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// VFTABLES-NEXT: [this adjustment: vtordisp at -4, 0 non-virtual]
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// GLOBALS-LABEL: @"??_7D@test3@@6B@" = {{.*}} constant { [3 x i8*] }
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// GLOBALS: @"?fn@D@test3@@$4PPPPPPPM@A@AEPAUA@2@XZ"
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// GLOBALS: @"?fn@D@test3@@$4PPPPPPPM@A@AEPAUB@2@XZ"
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// GLOBALS: @"?fn@D@test3@@$4PPPPPPPM@A@AEPAU12@XZ"
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}
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namespace pr34302 {
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// C::f is lives in the vftable inside its virtual B subobject. In the MS ABI,
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// covariant return type virtual methods extend vftables from virtual bases,
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// even though that can make it impossible to implement certain diamond
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// hierarchies correctly.
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struct A { virtual ~A(); };
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struct B : A { virtual B *f(); };
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struct C : virtual B { C *f(); };
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C c;
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// VFTABLES-LABEL: VFTable indices for 'pr34302::C' (2 entries).
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// VFTABLES-NEXT: -- accessible via vbtable index 1, vfptr at offset 0 --
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// VFTABLES-NEXT: 0 | pr34302::C::~C() [scalar deleting]
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// VFTABLES-NEXT: 2 | pr34302::C *pr34302::C::f()
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}
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