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266 lines
9.4 KiB
266 lines
9.4 KiB
4 months ago
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// RUN: %clang_cc1 -std=c++2a -fsyntax-only -triple x86_64-linux-gnu -fdump-record-layouts %s | FileCheck %s
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namespace Empty {
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struct A {};
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struct B { [[no_unique_address]] A a; char b; };
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static_assert(sizeof(B) == 1);
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// CHECK:*** Dumping AST Record Layout
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// CHECK: 0 | struct Empty::B
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// CHECK-NEXT: 0 | struct Empty::A a (empty)
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// CHECK-NEXT: 0 | char b
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// CHECK-NEXT: | [sizeof=1, dsize=1, align=1,
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// CHECK-NEXT: | nvsize=1, nvalign=1]
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struct C {};
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struct D {
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[[no_unique_address]] A a;
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[[no_unique_address]] C c;
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char d;
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};
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static_assert(sizeof(D) == 1);
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// CHECK:*** Dumping AST Record Layout
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// CHECK: 0 | struct Empty::D
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// CHECK-NEXT: 0 | struct Empty::A a (empty)
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// CHECK-NEXT: 0 | struct Empty::C c (empty)
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// CHECK-NEXT: 0 | char d
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// CHECK-NEXT: | [sizeof=1, dsize=1, align=1,
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// CHECK-NEXT: | nvsize=1, nvalign=1]
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struct E {
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[[no_unique_address]] A a1;
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[[no_unique_address]] A a2;
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char e;
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};
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static_assert(sizeof(E) == 2);
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// CHECK:*** Dumping AST Record Layout
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// CHECK: 0 | struct Empty::E
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// CHECK-NEXT: 0 | struct Empty::A a1 (empty)
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// CHECK-NEXT: 1 | struct Empty::A a2 (empty)
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// CHECK-NEXT: 0 | char e
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// CHECK-NEXT: | [sizeof=2, dsize=2, align=1,
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// CHECK-NEXT: | nvsize=2, nvalign=1]
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struct F {
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~F();
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[[no_unique_address]] A a1;
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[[no_unique_address]] A a2;
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char f;
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};
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static_assert(sizeof(F) == 2);
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// CHECK:*** Dumping AST Record Layout
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// CHECK: 0 | struct Empty::F
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// CHECK-NEXT: 0 | struct Empty::A a1 (empty)
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// CHECK-NEXT: 1 | struct Empty::A a2 (empty)
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// CHECK-NEXT: 0 | char f
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// CHECK-NEXT: | [sizeof=2, dsize=1, align=1,
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// CHECK-NEXT: | nvsize=2, nvalign=1]
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struct G { [[no_unique_address]] A a; ~G(); };
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static_assert(sizeof(G) == 1);
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// CHECK:*** Dumping AST Record Layout
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// CHECK: 0 | struct Empty::G
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// CHECK-NEXT: 0 | struct Empty::A a (empty)
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// CHECK-NEXT: | [sizeof=1, dsize=0, align=1,
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// CHECK-NEXT: | nvsize=1, nvalign=1]
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struct H { [[no_unique_address]] A a, b; ~H(); };
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static_assert(sizeof(H) == 2);
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// CHECK:*** Dumping AST Record Layout
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// CHECK: 0 | struct Empty::H
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// CHECK-NEXT: 0 | struct Empty::A a (empty)
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// CHECK-NEXT: 1 | struct Empty::A b (empty)
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// CHECK-NEXT: | [sizeof=2, dsize=0, align=1,
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// CHECK-NEXT: | nvsize=2, nvalign=1]
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struct OversizedEmpty : A {
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~OversizedEmpty();
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[[no_unique_address]] A a;
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};
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static_assert(sizeof(OversizedEmpty) == 2);
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// CHECK:*** Dumping AST Record Layout
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// CHECK: 0 | struct Empty::OversizedEmpty
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// CHECK-NEXT: 0 | struct Empty::A (base) (empty)
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// CHECK-NEXT: 1 | struct Empty::A a (empty)
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// CHECK-NEXT: | [sizeof=2, dsize=0, align=1,
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// CHECK-NEXT: | nvsize=2, nvalign=1]
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struct HasOversizedEmpty {
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[[no_unique_address]] OversizedEmpty m;
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};
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static_assert(sizeof(HasOversizedEmpty) == 2);
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// CHECK:*** Dumping AST Record Layout
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// CHECK: 0 | struct Empty::HasOversizedEmpty
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// CHECK-NEXT: 0 | struct Empty::OversizedEmpty m (empty)
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// CHECK-NEXT: 0 | struct Empty::A (base) (empty)
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// CHECK-NEXT: 1 | struct Empty::A a (empty)
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// CHECK-NEXT: | [sizeof=2, dsize=0, align=1,
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// CHECK-NEXT: | nvsize=2, nvalign=1]
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struct EmptyWithNonzeroDSize {
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[[no_unique_address]] A a;
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int x;
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[[no_unique_address]] A b;
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int y;
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[[no_unique_address]] A c;
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};
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static_assert(sizeof(EmptyWithNonzeroDSize) == 12);
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// CHECK:*** Dumping AST Record Layout
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// CHECK: 0 | struct Empty::EmptyWithNonzeroDSize
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// CHECK-NEXT: 0 | struct Empty::A a (empty)
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// CHECK-NEXT: 0 | int x
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// CHECK-NEXT: 4 | struct Empty::A b (empty)
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// CHECK-NEXT: 4 | int y
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// CHECK-NEXT: 8 | struct Empty::A c (empty)
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// CHECK-NEXT: | [sizeof=12, dsize=12, align=4,
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// CHECK-NEXT: | nvsize=12, nvalign=4]
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struct EmptyWithNonzeroDSizeNonPOD {
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~EmptyWithNonzeroDSizeNonPOD();
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[[no_unique_address]] A a;
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int x;
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[[no_unique_address]] A b;
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int y;
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[[no_unique_address]] A c;
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};
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static_assert(sizeof(EmptyWithNonzeroDSizeNonPOD) == 12);
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// CHECK:*** Dumping AST Record Layout
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// CHECK: 0 | struct Empty::EmptyWithNonzeroDSizeNonPOD
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// CHECK-NEXT: 0 | struct Empty::A a (empty)
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// CHECK-NEXT: 0 | int x
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// CHECK-NEXT: 4 | struct Empty::A b (empty)
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// CHECK-NEXT: 4 | int y
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// CHECK-NEXT: 8 | struct Empty::A c (empty)
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// CHECK-NEXT: | [sizeof=12, dsize=8, align=4,
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// CHECK-NEXT: | nvsize=9, nvalign=4]
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}
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namespace POD {
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// Cannot reuse tail padding of a PDO type.
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struct A { int n; char c[3]; };
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struct B { [[no_unique_address]] A a; char d; };
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static_assert(sizeof(B) == 12);
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// CHECK:*** Dumping AST Record Layout
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// CHECK: 0 | struct POD::B
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// CHECK-NEXT: 0 | struct POD::A a
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// CHECK-NEXT: 0 | int n
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// CHECK-NEXT: 4 | char [3] c
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// CHECK-NEXT: 8 | char d
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// CHECK-NEXT: | [sizeof=12, dsize=12, align=4,
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// CHECK-NEXT: | nvsize=12, nvalign=4]
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}
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namespace NonPOD {
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struct A { int n; char c[3]; ~A(); };
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struct B { [[no_unique_address]] A a; char d; };
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static_assert(sizeof(B) == 8);
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// CHECK:*** Dumping AST Record Layout
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// CHECK: 0 | struct NonPOD::B
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// CHECK-NEXT: 0 | struct NonPOD::A a
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// CHECK-NEXT: 0 | int n
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// CHECK-NEXT: 4 | char [3] c
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// CHECK-NEXT: 7 | char d
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// CHECK-NEXT: | [sizeof=8, dsize=8, align=4,
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// CHECK-NEXT: | nvsize=8, nvalign=4]
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}
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namespace NVSizeGreaterThanDSize {
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// The nvsize of an object includes the complete size of its empty subobjects
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// (although it's unclear why). Ensure this corner case is handled properly.
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struct alignas(8) A { ~A(); }; // dsize 0, nvsize 0, size 8
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struct B : A { char c; }; // dsize 1, nvsize 8, size 8
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static_assert(sizeof(B) == 8);
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// CHECK:*** Dumping AST Record Layout
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// CHECK: 0 | struct NVSizeGreaterThanDSize::B
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// CHECK-NEXT: 0 | struct NVSizeGreaterThanDSize::A (base) (empty)
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// CHECK-NEXT: 0 | char c
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// CHECK-NEXT: | [sizeof=8, dsize=1, align=8,
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// CHECK-NEXT: | nvsize=8, nvalign=8]
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struct V { int n; };
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// V is at offset 16, not offset 12, because B's tail padding is strangely not
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// usable for virtual bases.
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struct C : B, virtual V {};
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static_assert(sizeof(C) == 24);
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// CHECK:*** Dumping AST Record Layout
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// CHECK: 0 | struct NVSizeGreaterThanDSize::C
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// CHECK-NEXT: 0 | (C vtable pointer)
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// CHECK-NEXT: 8 | struct NVSizeGreaterThanDSize::B (base)
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// CHECK-NEXT: 8 | struct NVSizeGreaterThanDSize::A (base) (empty)
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// CHECK-NEXT: 8 | char c
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// CHECK-NEXT: 16 | struct NVSizeGreaterThanDSize::V (virtual base)
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// CHECK-NEXT: 16 | int n
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// CHECK-NEXT: | [sizeof=24, dsize=20, align=8,
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// CHECK-NEXT: | nvsize=16, nvalign=8]
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struct D : virtual V {
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[[no_unique_address]] B b;
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};
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static_assert(sizeof(D) == 24);
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// CHECK:*** Dumping AST Record Layout
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// CHECK: 0 | struct NVSizeGreaterThanDSize::D
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// CHECK-NEXT: 0 | (D vtable pointer)
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// CHECK-NEXT: 8 | struct NVSizeGreaterThanDSize::B b
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// CHECK-NEXT: 8 | struct NVSizeGreaterThanDSize::A (base) (empty)
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// CHECK-NEXT: 8 | char c
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// CHECK-NEXT: 16 | struct NVSizeGreaterThanDSize::V (virtual base)
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// CHECK-NEXT: 16 | int n
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// CHECK-NEXT: | [sizeof=24, dsize=20, align=8,
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// CHECK-NEXT: | nvsize=16, nvalign=8]
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struct X : virtual A { [[no_unique_address]] A a; };
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struct E : virtual A {
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[[no_unique_address]] A a;
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// Here, we arrange for X to hang over the end of the nvsize of E. This
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// should force the A vbase to be laid out at offset 24, not 16.
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[[no_unique_address]] X x;
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};
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static_assert(sizeof(E) == 32);
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// CHECK:*** Dumping AST Record Layout
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// CHECK: 0 | struct NVSizeGreaterThanDSize::E
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// CHECK-NEXT: 0 | (E vtable pointer)
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// CHECK-NEXT: 0 | struct NVSizeGreaterThanDSize::A a (empty)
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// CHECK-NEXT: 8 | struct NVSizeGreaterThanDSize::X x
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// CHECK-NEXT: 8 | (X vtable pointer)
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// CHECK-NEXT: 8 | struct NVSizeGreaterThanDSize::A a (empty)
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// CHECK-NEXT: 16 | struct NVSizeGreaterThanDSize::A (virtual base) (empty)
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// CHECK-NEXT: 24 | struct NVSizeGreaterThanDSize::A (virtual base) (empty)
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// CHECK-NEXT: | [sizeof=32, dsize=16, align=8,
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// CHECK-NEXT: | nvsize=16, nvalign=8]
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}
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namespace RepeatedVBase {
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struct alignas(16) A { ~A(); };
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struct B : A {};
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struct X : virtual A, virtual B {};
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struct Y { [[no_unique_address]] X x; char c; };
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static_assert(sizeof(Y) == 32);
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// CHECK:*** Dumping AST Record Layout
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// CHECK: 0 | struct RepeatedVBase::Y
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// CHECK-NEXT: 0 | struct RepeatedVBase::X x
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// CHECK-NEXT: 0 | (X vtable pointer)
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// CHECK-NEXT: 0 | struct RepeatedVBase::A (virtual base) (empty)
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// CHECK-NEXT: 16 | struct RepeatedVBase::B (virtual base) (empty)
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// CHECK-NEXT: 16 | struct RepeatedVBase::A (base) (empty)
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// CHECK-NEXT: 8 | char c
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// CHECK-NEXT: | [sizeof=32, dsize=9, align=16,
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// CHECK-NEXT: | nvsize=9, nvalign=16]
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}
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