| // RUN: %clang_cc1 -fsyntax-only -triple armv7k-apple-darwin-watchos -fdump-record-layouts %s | FileCheck %s |
| |
| // WatchOS, 64-bit iOS, and WebAssembly use the C++11 definition of POD to |
| // determine whether we can reuse the tail padding of a struct (POD is |
| // "trivially copyable and standard layout"). The definition of standard |
| // layout changed some time around C++17; check that we still use the old |
| // ABI rule. |
| |
| // B is not standard-layout, but it was under C++11's rule, so we pack |
| // C::d into its tail padding anyway. |
| struct A { int : 0; }; |
| struct B : A { int n; char c[3]; }; |
| struct C : B { char d; }; |
| int c = sizeof(C); |
| static_assert(!__is_standard_layout(B)); |
| |
| // CHECK:*** Dumping AST Record Layout |
| // CHECK: 0 | struct C |
| // CHECK-NEXT: 0 | struct B (base) |
| // CHECK-NEXT: 0 | struct A (base) (empty) |
| // CHECK-NEXT: 0:- | int |
| // CHECK-NEXT: 0 | int n |
| // CHECK-NEXT: 4 | char [3] c |
| // CHECK-NEXT: 8 | char d |
| // CHECK-NEXT: | [sizeof=12, dsize=9, align=4, |
| // CHECK-NEXT: | nvsize=9, nvalign=4] |
| |
| // F is not standard-layout due to the repeated D base class, but it was under |
| // C++11's rule, so we pack G::d into its tail padding anyway. |
| struct D {}; |
| struct E : D {}; |
| struct F : D, E { int n; char c[3]; }; |
| struct G : F { G(const G&); char d; }; |
| int g = sizeof(G); |
| static_assert(!__is_standard_layout(F)); |
| |
| // CHECK:*** Dumping AST Record Layout |
| // CHECK: 0 | struct G |
| // CHECK-NEXT: 0 | struct F (base) |
| // CHECK-NEXT: 0 | struct D (base) (empty) |
| // CHECK-NEXT: 1 | struct E (base) (empty) |
| // CHECK-NEXT: 1 | struct D (base) (empty) |
| // CHECK-NEXT: 0 | int n |
| // CHECK-NEXT: 4 | char [3] c |
| // CHECK-NEXT: 8 | char d |
| // CHECK-NEXT: | [sizeof=12, dsize=9, align=4, |
| // CHECK-NEXT: | nvsize=9, nvalign=4] |
