clang/test/CodeGenCXX/override-bit-field-layout.cpp

   1 // RUN: %clang_cc1 %std_cxx98-14 -w -triple=x86_64-pc-win32 -fms-compatibility -fdump-record-layouts-simple -foverride-record-layout=%S/Inputs/override-bit-field-layout.layout %s | FileCheck %s --check-prefixes=CHECK,PRE17
   2 // RUN: %clang_cc1 -std=c++17 -w -triple=x86_64-pc-win32 -fms-compatibility -fdump-record-layouts-simple -foverride-record-layout=%S/Inputs/override-bit-field-layout.layout %s | FileCheck %s --check-prefixes=CHECK,CXX17
   3 // RUN: %clang_cc1 %std_cxx20- -w -triple=x86_64-pc-win32 -fms-compatibility -fdump-record-layouts-simple -foverride-record-layout=%S/Inputs/override-bit-field-layout.layout %s | FileCheck %s --check-prefixes=CHECK,CXX20
   4
   5 // PRE17: Type: struct S1
   6 // PRE17:   FieldOffsets: [0, 11]
   7 struct S1 {
   8   short a : 3;
   9   short b : 5;
  10 };
  11
  12 // CHECK: Type: struct S2
  13 // CHECK:   FieldOffsets: [64]
  14 struct S2 {
  15   virtual ~S2() = default;
  16   short a : 3;
  17 };
  18
  19 // CXX17: Type: struct S1
  20 // CXX17:   FieldOffsets: [0, 11]
  21 // CXX20: Type: struct S1
  22 // CXX20:   FieldOffsets: [0, 3]
  23
  24 // CHECK: Type: struct S3
  25 // CHECK:   Size:32
  26 // CHECK:   FieldOffsets: [0, 1]
  27 struct S3 {
  28   int a : 1;
  29   int b : 2;
  30 };
  31
  32 // CHECK: Type: struct S4
  33 // CHECK:   FieldOffsets: [32]
  34 struct S4 : S3 {
  35   char c;
  36 };
  37
  38 void use_structs() {
  39   S1 s1s[sizeof(S1)];
  40   S2 s2s[sizeof(S2)];
  41   S3 s3s[sizeof(S3)];
  42   S4 s4s[sizeof(S4)];
  43 }