Tim Northover | c264e16 | 2013-01-31 12:13:10 +0000 | [diff] [blame] | 1 | // RUN: %clang_cc1 -triple aarch64-none-linux-gnu -emit-llvm -w -o - %s | FileCheck %s |
| 2 | |
| 3 | // Check differences between the generic Itanium ABI, the AArch32 version and |
| 4 | // the AArch64 version. |
| 5 | |
| 6 | //////////////////////////////////////////////////////////////////////////////// |
| 7 | |
| 8 | // The ABI says that the key function is the "textually first, non-inline, |
| 9 | // non-pure, virtual member function". The generic version decides this after |
| 10 | // the completion of the class definition; the AArch32 version decides this at |
| 11 | // the end of the translation unit. |
| 12 | |
| 13 | // We construct a class which needs a VTable here under generic ABI, but not |
| 14 | // AArch32. |
| 15 | |
| 16 | // (see next section for explanation of guard) |
| 17 | // CHECK: @_ZGVZ15guard_variablesiE4mine = internal global i64 0 |
| 18 | |
| 19 | // CHECK: @_ZTV16CheckKeyFunction = |
| 20 | struct CheckKeyFunction { |
| 21 | virtual void foo(); |
| 22 | }; |
| 23 | |
| 24 | // This is not inline when CheckKeyFunction is completed, so |
| 25 | // CheckKeyFunction::foo is the key function. VTables should be emitted. |
| 26 | inline void CheckKeyFunction::foo() { |
| 27 | } |
| 28 | |
| 29 | //////////////////////////////////////////////////////////////////////////////// |
| 30 | |
| 31 | // Guard variables only specify and use the low bit to determine status, rather |
| 32 | // than the low byte as in the generic Itanium ABI. However, unlike 32-bit ARM, |
| 33 | // they *are* 64-bits wide so check that in case confusion has occurred. |
| 34 | |
| 35 | class Guarded { |
| 36 | public: |
| 37 | Guarded(int i); |
| 38 | ~Guarded(); |
| 39 | }; |
| 40 | |
| 41 | void guard_variables(int a) { |
| 42 | static Guarded mine(a); |
| 43 | // CHECK: [[GUARDBIT:%[0-9]+]] = and i64 {{%[0-9]+}}, 1 |
| 44 | // CHECK: icmp eq i64 [[GUARDBIT]], 0 |
| 45 | |
| 46 | // As guards are 64-bit, these helpers should take 64-bit pointers. |
| 47 | // CHECK: call i32 @__cxa_guard_acquire(i64* |
| 48 | // CHECK: call void @__cxa_guard_release(i64* |
| 49 | } |
| 50 | |
| 51 | //////////////////////////////////////////////////////////////////////////////// |
| 52 | |
| 53 | // Member function pointers use the adj field to distinguish between virtual and |
| 54 | // nonvirtual members. As a result the adjustment is shifted (if ptr was used, a |
| 55 | // mask would be expected instead). |
| 56 | |
| 57 | class C { |
| 58 | int a(); |
| 59 | virtual int b(); |
| 60 | }; |
| 61 | |
| 62 | |
| 63 | int member_pointer(C &c, int (C::*func)()) { |
| 64 | // CHECK: ashr i64 %[[MEMPTRADJ:[0-9a-z.]+]], 1 |
| 65 | // CHECK: %[[ISVIRTUAL:[0-9]+]] = and i64 %[[MEMPTRADJ]], 1 |
| 66 | // CHECK: icmp ne i64 %[[ISVIRTUAL]], 0 |
| 67 | return (c.*func)(); |
| 68 | } |
| 69 | |
| 70 | //////////////////////////////////////////////////////////////////////////////// |
| 71 | |
| 72 | // AArch64 PCS says that va_list type is based on "struct __va_list ..." in the |
| 73 | // std namespace, which means it should mangle as "St9__va_list". |
| 74 | |
| 75 | // CHECK: @_Z7va_funcSt9__va_list |
| 76 | void va_func(__builtin_va_list l) { |
| 77 | } |
| 78 | |
| 79 | //////////////////////////////////////////////////////////////////////////////// |
| 80 | |
| 81 | // AArch64 constructors (like generic Itanium, but unlike AArch32) do not return |
| 82 | // "this". |
| 83 | |
| 84 | void test_constructor() { |
| 85 | Guarded g(42); |
| 86 | // CHECK: call void @_ZN7GuardedC1Ei |
| 87 | } |
| 88 | |
| 89 | //////////////////////////////////////////////////////////////////////////////// |
| 90 | |
| 91 | // In principle the AArch32 ABI allows this to be accomplished via a call to |
| 92 | // __aeabi_atexit instead of __cxa_atexit. Clang doesn't make use of this at the |
| 93 | // moment, but it's definitely not allowed for AArch64. |
| 94 | |
| 95 | // CHECK: call i32 @__cxa_atexit |
| 96 | Guarded g(42); |