clang/test/CodeGenCXX/override-layout-virtual-base.cpp

   1 // RUN: %clang_cc1 -w -triple=x86_64-pc-win32 -fms-compatibility -fdump-record-layouts-simple -foverride-record-layout=%S/Inputs/override-layout-virtual-base.layout %s | FileCheck --check-prefix=SIMPLE  %s
   2 // RUN: %clang_cc1 -w -triple=x86_64-pc-win32 -fms-compatibility -fdump-record-layouts -foverride-record-layout=%S/Inputs/override-layout-virtual-base.layout %s | FileCheck %s
   3
   4 struct S1 {
   5   int a;
   6 };
   7
   8 struct S2 : virtual S1 {
   9   virtual void foo() {}
  10 };
  11
  12 // SIMPLE: Type: struct S3
  13 // SIMPLE:   FieldOffsets: [64]
  14 struct S3 : S2 {
  15   char b;
  16 };
  17
  18 struct S4 {
  19 };
  20
  21 struct S5 : S4 {
  22   virtual void foo() {}
  23 };
  24
  25 // CHECK:      *** Dumping AST Record Layout
  26 // CHECK:               0 | struct S2
  27 // CHECK-NEXT:          0 |   (S2 vftable pointer)
  28 // CHECK-NEXT:          8 |   (S2 vbtable pointer)
  29 // CHECK-NEXT:          8 |   struct S1 (virtual base)
  30 // CHECK-NEXT:          8 |     int a
  31 // CHECK-NEXT:            | [sizeof=8, align=8,
  32 // CHECK-NEXT:            |  nvsize=8, nvalign=8]
  33 // CHECK:      *** Dumping AST Record Layout
  34 // CHECK:               0 | struct S3
  35 // CHECK-NEXT:          0 |   struct S2 (primary base)
  36 // CHECK-NEXT:          0 |     (S2 vftable pointer)
  37 // CHECK-NEXT:          8 |     (S2 vbtable pointer)
  38 // CHECK-NEXT:          8 |   char b
  39 // CHECK-NEXT:         16 |   struct S1 (virtual base)
  40 // CHECK-NEXT:         16 |     int a
  41 // CHECK-NEXT:            | [sizeof=24, align=8,
  42 // CHECK-NEXT:            |  nvsize=16, nvalign=8]
  43 // CHECK:      *** Dumping AST Record Layout
  44 // CHECK:               0 | struct S5
  45 // CHECK-NEXT:          0 |   (S5 vftable pointer)
  46 // CHECK-NEXT:          0 |   struct S4 (base) (empty)
  47 // CHECK-NEXT:            | [sizeof=8, align=8,
  48 // CHECK-NEXT:            |  nvsize=8, nvalign=8]
  49
  50 void use_structs() {
  51   S1 s1s[sizeof(S1)];
  52   S2 s2s[sizeof(S2)];
  53   S3 s3s[sizeof(S3)];
  54   S4 s4s[sizeof(S4)];
  55   S5 s5s[sizeof(S5)];
  56 }