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