forked from OSchip/llvm-project
68 lines
2.2 KiB
C++
68 lines
2.2 KiB
C++
// RUN: %clang_cc1 -triple arm64-apple-ios7.0 -target-abi darwinpcs -emit-llvm -o - %s | FileCheck %s
|
|
// RUN: %clang_cc1 -triple aarch64-linux-gnu -emit-llvm -o - -x c %s | FileCheck %s --check-prefix=CHECK-GNU-C
|
|
// RUN: %clang_cc1 -triple aarch64-linux-gnu -emit-llvm -o - %s | FileCheck %s --check-prefix=CHECK-GNU-CXX
|
|
|
|
// Empty structs are ignored for PCS purposes on Darwin and in C mode elsewhere.
|
|
// In C++ mode on ELF they consume a register slot though. Functions are
|
|
// slightly bigger than minimal to make confirmation against actual GCC
|
|
// behaviour easier.
|
|
|
|
#if __cplusplus
|
|
#define EXTERNC extern "C"
|
|
#else
|
|
#define EXTERNC
|
|
#endif
|
|
|
|
struct Empty {};
|
|
|
|
// CHECK: define{{.*}} i32 @empty_arg(i32 noundef %a)
|
|
// CHECK-GNU-C: define{{.*}} i32 @empty_arg(i32 noundef %a)
|
|
// CHECK-GNU-CXX: define{{.*}} i32 @empty_arg(i8 %e.coerce, i32 noundef %a)
|
|
EXTERNC int empty_arg(struct Empty e, int a) {
|
|
return a;
|
|
}
|
|
|
|
// CHECK: define{{.*}} void @empty_ret()
|
|
// CHECK-GNU-C: define{{.*}} void @empty_ret()
|
|
// CHECK-GNU-CXX: define{{.*}} void @empty_ret()
|
|
EXTERNC struct Empty empty_ret() {
|
|
struct Empty e;
|
|
return e;
|
|
}
|
|
|
|
// However, what counts as "empty" is a baroque mess. This is super-empty, it's
|
|
// ignored even in C++ mode. It also has sizeof == 0, violating C++, but that's
|
|
// legacy for you:
|
|
|
|
struct SuperEmpty {
|
|
int arr[0];
|
|
};
|
|
|
|
// CHECK: define{{.*}} i32 @super_empty_arg(i32 noundef %a)
|
|
// CHECK-GNU-C: define{{.*}} i32 @super_empty_arg(i32 noundef %a)
|
|
// CHECK-GNU-CXX: define{{.*}} i32 @super_empty_arg(i32 noundef %a)
|
|
EXTERNC int super_empty_arg(struct SuperEmpty e, int a) {
|
|
return a;
|
|
}
|
|
|
|
// This is not empty. It has 0 size but consumes a register slot for GCC.
|
|
|
|
struct SortOfEmpty {
|
|
struct SuperEmpty e;
|
|
};
|
|
|
|
// CHECK: define{{.*}} i32 @sort_of_empty_arg(i32 noundef %a)
|
|
// CHECK-GNU-C: define{{.*}} i32 @sort_of_empty_arg(i32 noundef %a)
|
|
// CHECK-GNU-CXX: define{{.*}} i32 @sort_of_empty_arg(i8 %e.coerce, i32 noundef %a)
|
|
EXTERNC int sort_of_empty_arg(struct Empty e, int a) {
|
|
return a;
|
|
}
|
|
|
|
// CHECK: define{{.*}} void @sort_of_empty_ret()
|
|
// CHECK-GNU-C: define{{.*}} void @sort_of_empty_ret()
|
|
// CHECK-GNU-CXX: define{{.*}} void @sort_of_empty_ret()
|
|
EXTERNC struct SortOfEmpty sort_of_empty_ret() {
|
|
struct SortOfEmpty e;
|
|
return e;
|
|
}
|