Aaron Ballman | 6c60c8d | 2012-02-22 03:04:13 +0000 | [diff] [blame] | 1 | // For MSVC ABI compatibility, all structures returned by value using the |
| 2 | // thiscall calling convention must use the hidden parameter. |
| 3 | // |
| 4 | // RUN: %clang_cc1 -triple i386-PC-Win32 %s -fms-compatibility -O0 -emit-llvm -o - | FileCheck %s |
| 5 | |
| 6 | // This structure would normally be returned via EAX |
| 7 | struct S { |
| 8 | int i; |
| 9 | }; |
| 10 | |
| 11 | // This structure would normally be returned via EAX/EDX |
| 12 | struct M { |
| 13 | int i; |
| 14 | int j; |
| 15 | }; |
| 16 | |
| 17 | class C { |
| 18 | public: |
| 19 | C() {} |
| 20 | |
| 21 | struct S __attribute__((thiscall)) Small() const { |
| 22 | struct S s = { 0 }; |
| 23 | return s; |
| 24 | } |
| 25 | |
| 26 | struct M __attribute__((thiscall)) Medium() const { |
| 27 | struct M m = { 0 }; |
| 28 | return m; |
| 29 | } |
| 30 | }; |
| 31 | |
| 32 | // CHECK: define void @_Z4testv() |
| 33 | void test( void ) { |
NAKAMURA Takumi | de40d3b | 2012-02-22 03:36:54 +0000 | [diff] [blame] | 34 | // CHECK: call void @_ZN1CC1Ev(%class.C* [[C:%.+]]) |
Aaron Ballman | 6c60c8d | 2012-02-22 03:04:13 +0000 | [diff] [blame] | 35 | C c; |
| 36 | |
NAKAMURA Takumi | de40d3b | 2012-02-22 03:36:54 +0000 | [diff] [blame] | 37 | // CHECK: call x86_thiscallcc void @_ZNK1C5SmallEv(%struct.S* sret %{{.+}}, %class.C* [[C]]) |
Aaron Ballman | 6c60c8d | 2012-02-22 03:04:13 +0000 | [diff] [blame] | 38 | (void)c.Small(); |
NAKAMURA Takumi | de40d3b | 2012-02-22 03:36:54 +0000 | [diff] [blame] | 39 | // CHECK: call x86_thiscallcc void @_ZNK1C6MediumEv(%struct.M* sret %{{.+}}, %class.C* [[C]]) |
Aaron Ballman | 6c60c8d | 2012-02-22 03:04:13 +0000 | [diff] [blame] | 40 | (void)c.Medium(); |
| 41 | } |