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llvm-project/clang/test/Layout/ms-x86-empty-layout.c

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__declspec is not a core Clang language extension. Instead, require -fms-extensions or -fborland to enable the language extension. Note: __declspec is also temporarily enabled when compiling for a CUDA target because there are implementation details relying on __declspec(property) support currently. When those details change, __declspec should be disabled for CUDA targets. llvm-svn: 238238
2015-05-27 03:44:52 +08:00
// RUN: %clang_cc1 -fno-rtti -emit-llvm-only -triple i686-pc-win32 -fms-extensions -fdump-record-layouts -fsyntax-only %s 2>/dev/null \
MS ABI: Add an additional test for empty structs in C Empty structs in C differ from those in C++. - C++ requires that empty types have size 1; alignment requirements may increase the size of the struct. - The C implementation doesn't let empty structs have a size under 4 bytes. Again, alignment requirements may increase the struct's size. Add a test to stress these differences. llvm-svn: 218963
2014-10-03 15:41:09 +08:00
// RUN: | FileCheck %s
__declspec is not a core Clang language extension. Instead, require -fms-extensions or -fborland to enable the language extension. Note: __declspec is also temporarily enabled when compiling for a CUDA target because there are implementation details relying on __declspec(property) support currently. When those details change, __declspec should be disabled for CUDA targets. llvm-svn: 238238
2015-05-27 03:44:52 +08:00
// RUN: %clang_cc1 -fno-rtti -emit-llvm-only -triple x86_64-pc-win32 -fms-extensions -fdump-record-layouts -fsyntax-only %s 2>/dev/null \
MS ABI: Add an additional test for empty structs in C Empty structs in C differ from those in C++. - C++ requires that empty types have size 1; alignment requirements may increase the size of the struct. - The C implementation doesn't let empty structs have a size under 4 bytes. Again, alignment requirements may increase the struct's size. Add a test to stress these differences. llvm-svn: 218963
2014-10-03 15:41:09 +08:00
// RUN: | FileCheck %s
struct EmptyIntMemb {
int FlexArrayMemb[0];
};
Fix the layout of bitfields in ms_struct unions: their alignment is ignored, and they always allocate a complete storage unit. Also, change the dumping of AST record layouts: use the more readable C++-style dumping even in C, include bitfield offset information in the dump, and don't print sizeof/alignof information for fields of record type, since we don't do so for bases or other kinds of field. rdar://22275433 llvm-svn: 245514
2015-08-20 06:42:36 +08:00
// CHECK: *** Dumping AST Record Layout
// CHECK-NEXT: 0 | struct EmptyIntMemb
// CHECK-NEXT: 0 | int [0] FlexArrayMemb
// CHECK-NEXT: | [sizeof=4, align=4
MS ABI: Add an additional test for empty structs in C Empty structs in C differ from those in C++. - C++ requires that empty types have size 1; alignment requirements may increase the size of the struct. - The C implementation doesn't let empty structs have a size under 4 bytes. Again, alignment requirements may increase the struct's size. Add a test to stress these differences. llvm-svn: 218963
2014-10-03 15:41:09 +08:00
struct EmptyLongLongMemb {
long long FlexArrayMemb[0];
};
// CHECK: *** Dumping AST Record Layout
Fix the layout of bitfields in ms_struct unions: their alignment is ignored, and they always allocate a complete storage unit. Also, change the dumping of AST record layouts: use the more readable C++-style dumping even in C, include bitfield offset information in the dump, and don't print sizeof/alignof information for fields of record type, since we don't do so for bases or other kinds of field. rdar://22275433 llvm-svn: 245514
2015-08-20 06:42:36 +08:00
// CHECK-NEXT: 0 | struct EmptyLongLongMemb
// CHECK-NEXT: 0 | long long [0] FlexArrayMemb
// CHECK-NEXT: | [sizeof=4, align=8
MS ABI: Add an additional test for empty structs in C Empty structs in C differ from those in C++. - C++ requires that empty types have size 1; alignment requirements may increase the size of the struct. - The C implementation doesn't let empty structs have a size under 4 bytes. Again, alignment requirements may increase the struct's size. Add a test to stress these differences. llvm-svn: 218963
2014-10-03 15:41:09 +08:00
struct EmptyAligned2LongLongMemb {
long long __declspec(align(2)) FlexArrayMemb[0];
};
// CHECK: *** Dumping AST Record Layout
Fix the layout of bitfields in ms_struct unions: their alignment is ignored, and they always allocate a complete storage unit. Also, change the dumping of AST record layouts: use the more readable C++-style dumping even in C, include bitfield offset information in the dump, and don't print sizeof/alignof information for fields of record type, since we don't do so for bases or other kinds of field. rdar://22275433 llvm-svn: 245514
2015-08-20 06:42:36 +08:00
// CHECK-NEXT: 0 | struct EmptyAligned2LongLongMemb
// CHECK-NEXT: 0 | long long [0] FlexArrayMemb
// CHECK-NEXT: | [sizeof=4, align=8
MS ABI: Add an additional test for empty structs in C Empty structs in C differ from those in C++. - C++ requires that empty types have size 1; alignment requirements may increase the size of the struct. - The C implementation doesn't let empty structs have a size under 4 bytes. Again, alignment requirements may increase the struct's size. Add a test to stress these differences. llvm-svn: 218963
2014-10-03 15:41:09 +08:00
struct EmptyAligned8LongLongMemb {
long long __declspec(align(8)) FlexArrayMemb[0];
};
// CHECK: *** Dumping AST Record Layout
Fix the layout of bitfields in ms_struct unions: their alignment is ignored, and they always allocate a complete storage unit. Also, change the dumping of AST record layouts: use the more readable C++-style dumping even in C, include bitfield offset information in the dump, and don't print sizeof/alignof information for fields of record type, since we don't do so for bases or other kinds of field. rdar://22275433 llvm-svn: 245514
2015-08-20 06:42:36 +08:00
// CHECK-NEXT: 0 | struct EmptyAligned8LongLongMemb
// CHECK-NEXT: 0 | long long [0] FlexArrayMemb
// CHECK-NEXT: | [sizeof=8, align=8
MS ABI: Add an additional test for empty structs in C Empty structs in C differ from those in C++. - C++ requires that empty types have size 1; alignment requirements may increase the size of the struct. - The C implementation doesn't let empty structs have a size under 4 bytes. Again, alignment requirements may increase the struct's size. Add a test to stress these differences. llvm-svn: 218963
2014-10-03 15:41:09 +08:00
#pragma pack(1)
struct __declspec(align(4)) EmptyPackedAligned4LongLongMemb {
long long FlexArrayMemb[0];
};
#pragma pack()
// CHECK: *** Dumping AST Record Layout
Fix the layout of bitfields in ms_struct unions: their alignment is ignored, and they always allocate a complete storage unit. Also, change the dumping of AST record layouts: use the more readable C++-style dumping even in C, include bitfield offset information in the dump, and don't print sizeof/alignof information for fields of record type, since we don't do so for bases or other kinds of field. rdar://22275433 llvm-svn: 245514
2015-08-20 06:42:36 +08:00
// CHECK-NEXT: 0 | struct EmptyPackedAligned4LongLongMemb
// CHECK-NEXT: 0 | long long [0] FlexArrayMemb
// CHECK-NEXT: | [sizeof=4, align=4
MS ABI: Add an additional test for empty structs in C Empty structs in C differ from those in C++. - C++ requires that empty types have size 1; alignment requirements may increase the size of the struct. - The C implementation doesn't let empty structs have a size under 4 bytes. Again, alignment requirements may increase the struct's size. Add a test to stress these differences. llvm-svn: 218963
2014-10-03 15:41:09 +08:00
#pragma pack(1)
struct EmptyPackedAligned8LongLongMemb {
long long __declspec(align(8)) FlexArrayMemb[0];
};
#pragma pack()
// CHECK: *** Dumping AST Record Layout
Fix the layout of bitfields in ms_struct unions: their alignment is ignored, and they always allocate a complete storage unit. Also, change the dumping of AST record layouts: use the more readable C++-style dumping even in C, include bitfield offset information in the dump, and don't print sizeof/alignof information for fields of record type, since we don't do so for bases or other kinds of field. rdar://22275433 llvm-svn: 245514
2015-08-20 06:42:36 +08:00
// CHECK-NEXT: 0 | struct EmptyPackedAligned8LongLongMemb
// CHECK-NEXT: 0 | long long [0] FlexArrayMemb
// CHECK-NEXT: | [sizeof=8, align=8
MS ABI: Add an additional test for empty structs in C Empty structs in C differ from those in C++. - C++ requires that empty types have size 1; alignment requirements may increase the size of the struct. - The C implementation doesn't let empty structs have a size under 4 bytes. Again, alignment requirements may increase the struct's size. Add a test to stress these differences. llvm-svn: 218963
2014-10-03 15:41:09 +08:00
int a[
sizeof(struct EmptyIntMemb)+
sizeof(struct EmptyLongLongMemb)+
sizeof(struct EmptyAligned2LongLongMemb)+
sizeof(struct EmptyAligned8LongLongMemb)+
sizeof(struct EmptyPackedAligned4LongLongMemb)+
sizeof(struct EmptyPackedAligned8LongLongMemb)+
0];