File: itanium-union-bitfield.cpp

package info (click to toggle)
llvm-toolchain-13 1%3A13.0.1-11
  • links: PTS, VCS
  • area: main
  • in suites: bookworm
  • size: 1,418,840 kB
  • sloc: cpp: 5,290,826; ansic: 996,570; asm: 544,593; python: 188,212; objc: 72,027; lisp: 30,291; f90: 25,395; sh: 24,898; javascript: 9,780; pascal: 9,398; perl: 7,484; ml: 5,432; awk: 3,523; makefile: 2,913; xml: 953; cs: 573; fortran: 539
file content (36 lines) | stat: -rw-r--r-- 974 bytes parent folder | download | duplicates (18) 
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
 
// RUN: %clang_cc1 -emit-llvm-only -triple %itanium_abi_triple -fdump-record-layouts %s 2>/dev/null \
// RUN:            | FileCheck %s

// On z/OS, a bit-field has single byte alignment.  Add aligned(4) on z/OS so the union has
// the same size & alignment as expected.
#ifdef __MVS__
#define ALIGN4 __attribute__((aligned(4)))
#else
#define ALIGN4
#endif

union A {
  int f1 : 3 ALIGN4;
  A();
};

A::A() {}

union B {
  char f1 : 35 ALIGN4;
  B();
};

B::B() {}

// CHECK:*** Dumping AST Record Layout
// CHECK-NEXT:     0 | union A
// CHECK-NEXT: 0:0-2 |   int f1
// CHECK-NEXT:       | [sizeof=4, dsize=1, align=4{{(, preferredalign=4,)?}}
// CHECK-NEXT:       |  nvsize=1, nvalign=4{{(, preferrednvalign=4)?}}]

// CHECK:*** Dumping AST Record Layout
// CHECK-NEXT:      0 | union B
// CHECK-NEXT: 0:0-34 |   char f1
// CHECK-NEXT:        | [sizeof=8, dsize=5, align=4{{(, preferredalign=4,)?}}
// CHECK-NEXT:        |  nvsize=5, nvalign=4{{(, preferrednvalign=4)?}}]