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llvm-project/clang/test/Layout/ms_struct-bitfields.c

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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
// RUN: %clang_cc1 -emit-llvm-only -triple armv7-apple-darwin -fdump-record-layouts %s 2>/dev/null \
// RUN: | FileCheck %s
// rdar://22275433
#pragma ms_struct on
union A {
unsigned long long x : 32;
unsigned long long y : 32;
} a;
// CHECK:*** Dumping AST Record Layout
// CHECK-NEXT: 0 | union A
// CHECK-NEXT: 0:0-31 | unsigned long long x
// CHECK-NEXT: 0:0-31 | unsigned long long y
// CHECK-NEXT: | [sizeof=8, align=1]
union B {
__attribute__((aligned(4)))
unsigned long long x : 32;
unsigned long long y : 32;
} b;
// CHECK:*** Dumping AST Record Layout
// CHECK-NEXT: 0 | union B
// CHECK-NEXT: 0:0-31 | unsigned long long x
// CHECK-NEXT: 0:0-31 | unsigned long long y
// CHECK-NEXT: | [sizeof=8, align=1]
union C {
unsigned long long : 0;
unsigned short y : 8;
} c;
// CHECK:*** Dumping AST Record Layout
// CHECK-NEXT: 0 | union C
// CHECK-NEXT: 0:- | unsigned long long
// CHECK-NEXT: 0:0-7 | unsigned short y
// CHECK-NEXT: | [sizeof=2, align=1]
union D {
unsigned long long : 0;
unsigned short : 0;
} d;
// CHECK:*** Dumping AST Record Layout
// CHECK-NEXT: 0 | union D
// CHECK-NEXT: 0:- | unsigned long long
// CHECK-NEXT: 0:- | unsigned short
// CHECK-NEXT: | [sizeof=1, align=1]