1 // RUN: %clang_cc1 -fsyntax-only -triple armv7k-apple-darwin-watchos -fdump-record-layouts %s | FileCheck %s
2 
3 // WatchOS, 64-bit iOS, and WebAssembly use the C++11 definition of POD to
4 // determine whether we can reuse the tail padding of a struct (POD is
5 // "trivially copyable and standard layout"). The definition of standard
6 // layout changed some time around C++17; check that we still use the old
7 // ABI rule.
8 
9 // B is not standard-layout, but it was under C++11's rule, so we pack
10 // C::d into its tail padding anyway.
11 struct A { int : 0; };
12 struct B : A { int n; char c[3]; };
13 struct C : B { char d; };
14 int c = sizeof(C);
15 static_assert(!__is_standard_layout(B));
16 
17 // CHECK:*** Dumping AST Record Layout
18 // CHECK:          0 | struct C
19 // CHECK-NEXT:     0 |   struct B (base)
20 // CHECK-NEXT:     0 |     struct A (base) (empty)
21 // CHECK-NEXT:   0:- |       int
22 // CHECK-NEXT:     0 |     int n
23 // CHECK-NEXT:     4 |     char [3] c
24 // CHECK-NEXT:     8 |   char d
25 // CHECK-NEXT:       | [sizeof=12, dsize=9, align=4,
26 // CHECK-NEXT:       |  nvsize=9, nvalign=4]
27 
28 // F is not standard-layout due to the repeated D base class, but it was under
29 // C++11's rule, so we pack G::d into its tail padding anyway.
30 struct D {};
31 struct E : D {};
32 struct F : D, E { int n; char c[3]; };
33 struct G : F { G(const G&); char d; };
34 int g = sizeof(G);
35 static_assert(!__is_standard_layout(F));
36 
37 // CHECK:*** Dumping AST Record Layout
38 // CHECK:          0 | struct G
39 // CHECK-NEXT:     0 |   struct F (base)
40 // CHECK-NEXT:     0 |     struct D (base) (empty)
41 // CHECK-NEXT:     1 |     struct E (base) (empty)
42 // CHECK-NEXT:     1 |       struct D (base) (empty)
43 // CHECK-NEXT:     0 |     int n
44 // CHECK-NEXT:     4 |     char [3] c
45 // CHECK-NEXT:     8 |   char d
46 // CHECK-NEXT:       | [sizeof=12, dsize=9, align=4,
47 // CHECK-NEXT:       |  nvsize=9, nvalign=4]
48