derek.holloway
7502bf64a4
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48 lines
1.8 KiB
C++
48 lines
1.8 KiB
C++
// RUN: %clang_cc1 -fsyntax-only -triple armv7k-apple-darwin-watchos -fdump-record-layouts %s | FileCheck %s
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// WatchOS, 64-bit iOS, and WebAssembly use the C++11 definition of POD to
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// determine whether we can reuse the tail padding of a struct (POD is
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// "trivially copyable and standard layout"). The definition of standard
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// layout changed some time around C++17; check that we still use the old
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// ABI rule.
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// B is not standard-layout, but it was under C++11's rule, so we pack
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// C::d into its tail padding anyway.
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struct A { int : 0; };
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struct B : A { int n; char c[3]; };
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struct C : B { char d; };
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int c = sizeof(C);
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static_assert(!__is_standard_layout(B));
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// CHECK:*** Dumping AST Record Layout
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// CHECK: 0 | struct C
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// CHECK-NEXT: 0 | struct B (base)
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// CHECK-NEXT: 0 | struct A (base) (empty)
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// CHECK-NEXT: 0:- | int
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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=9, align=4,
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// CHECK-NEXT: | nvsize=9, nvalign=4]
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// F is not standard-layout due to the repeated D base class, but it was under
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// C++11's rule, so we pack G::d into its tail padding anyway.
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struct D {};
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struct E : D {};
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struct F : D, E { int n; char c[3]; };
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struct G : F { G(const G&); char d; };
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int g = sizeof(G);
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static_assert(!__is_standard_layout(F));
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// CHECK:*** Dumping AST Record Layout
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// CHECK: 0 | struct G
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// CHECK-NEXT: 0 | struct F (base)
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// CHECK-NEXT: 0 | struct D (base) (empty)
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// CHECK-NEXT: 1 | struct E (base) (empty)
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// CHECK-NEXT: 1 | struct D (base) (empty)
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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=9, align=4,
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// CHECK-NEXT: | nvsize=9, nvalign=4]
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