File: ms-aligned-array.c

package info (click to toggle)
llvm-toolchain-17 1%3A17.0.6-22
  • links: PTS, VCS
  • area: main
  • in suites: forky, sid, trixie
  • size: 1,799,624 kB
  • sloc: cpp: 6,428,607; ansic: 1,383,196; asm: 793,408; python: 223,504; objc: 75,364; f90: 60,502; lisp: 33,869; pascal: 15,282; sh: 9,684; perl: 7,453; ml: 4,937; awk: 3,523; makefile: 2,889; javascript: 2,149; xml: 888; fortran: 619; cs: 573
file content (60 lines) | stat: -rw-r--r-- 1,896 bytes parent folder | download | duplicates (5)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
// RUN: %clang_cc1 -fno-rtti -emit-llvm-only -triple x86_64-pc-win32 -fms-extensions -fdump-record-layouts -fsyntax-only %s 2>/dev/null \
// RUN:            | FileCheck %s -check-prefix CHECK

// Before PR45420, we would only find the alignment on this record. Afterwards,
// we can see the alignment on the typedef through the array type.
// FIXME: What about other type sugar, like _Atomic? This would only matter in a
// packed struct context.
struct __declspec(align(16)) AlignedStruct { int x; };
struct Struct2 {
  char c[16];
};
typedef struct Struct2 __declspec(align(16)) AlignedStruct2;

#define CHECK_SIZE(X, Align) \
  _Static_assert(__alignof(struct X) == Align, "should be aligned");

#pragma pack(push, 2)

struct A {
  struct AlignedStruct a[1];
};
CHECK_SIZE(A, 16);

struct B {
  char b;
  AlignedStruct2 a[1];
};
CHECK_SIZE(B, 16);

struct C {
  char b;
  AlignedStruct2 a[];
};
CHECK_SIZE(C, 16);

// CHECK: *** Dumping AST Record Layout
// CHECK-NEXT:          0 | struct AlignedStruct
// CHECK-NEXT:          0 |   int x
// CHECK-NEXT:            | [sizeof=16, align=16]
// CHECK: *** Dumping AST Record Layout
// CHECK-NEXT:          0 | struct A
// CHECK-NEXT:          0 |   struct AlignedStruct[1] a
// CHECK-NEXT:            | [sizeof=16, align=16]
// CHECK: *** Dumping AST Record Layout
// CHECK-NEXT:          0 | struct Struct2
// CHECK-NEXT:          0 |   char[16] c
// CHECK-NEXT:            | [sizeof=16, align=1]
// CHECK: *** Dumping AST Record Layout
// CHECK-NEXT:          0 | struct B
// CHECK-NEXT:          0 |   char b
// CHECK-NEXT:         16 |   AlignedStruct2[1] a
// CHECK-NEXT:            | [sizeof=32, align=16]
// CHECK: *** Dumping AST Record Layout
// CHECK-NEXT:          0 | struct C
// CHECK-NEXT:          0 |   char b
// CHECK-NEXT:         16 |   AlignedStruct2[] a
// CHECK-NEXT:            | [sizeof=16, align=16]

#pragma pack(pop)