clang/test/Layout/itanium-union-bitfield.cpp

   1 // RUN: %clang_cc1 -emit-llvm-only -triple %itanium_abi_triple -fdump-record-layouts %s 2>/dev/null \
   2 // RUN:            | FileCheck %s
   3
   4 // On z/OS, a bit-field has single byte alignment.  Add aligned(4) on z/OS so the union has
   5 // the same size & alignment as expected.
   6 #ifdef __MVS__
   7 #define ALIGN4 __attribute__((aligned(4)))
   8 #else
   9 #define ALIGN4
  10 #endif
  11
  12 union A {
  13   int f1 : 3 ALIGN4;
  14   A();
  15 };
  16
  17 A::A() {}
  18
  19 union B {
  20   char f1 : 35 ALIGN4;
  21   B();
  22 };
  23
  24 B::B() {}
  25
  26 // CHECK:*** Dumping AST Record Layout
  27 // CHECK-NEXT:     0 | union A
  28 // CHECK-NEXT: 0:0-2 |   int f1
  29 // CHECK-NEXT:       | [sizeof=4, dsize=1, align=4{{(, preferredalign=4,)?}}
  30 // CHECK-NEXT:       |  nvsize=1, nvalign=4{{(, preferrednvalign=4)?}}]
  31
  32 // CHECK:*** Dumping AST Record Layout
  33 // CHECK-NEXT:      0 | union B
  34 // CHECK-NEXT: 0:0-34 |   char f1
  35 // CHECK-NEXT:        | [sizeof=8, dsize=5, align=4{{(, preferredalign=4,)?}}
  36 // CHECK-NEXT:        |  nvsize=5, nvalign=4{{(, preferrednvalign=4)?}}]