clang/test/CodeGenCXX/override-layout.cpp

   1 // RUN: %clang_cc1 -w -fdump-record-layouts-simple %s > %t.layouts
   2 // RUN: %clang_cc1 -w -fdump-record-layouts-simple %s > %t.before
   3 // RUN: %clang_cc1 -w -DPACKED= -DALIGNED16= -fdump-record-layouts-simple -foverride-record-layout=%t.layouts %s > %t.after
   4 // RUN: diff -u %t.before %t.after
   5 // RUN: FileCheck %s < %t.after
   6
   7 // If not explicitly disabled, set PACKED to the packed attribute.
   8 #ifndef PACKED
   9 #  define PACKED __attribute__((packed))
  10 #endif
  11
  12 struct Empty1 { };
  13 struct Empty2 { };
  14
  15 // CHECK: Type: struct X0
  16 struct X0 : public Empty1 {
  17   int x[6] PACKED;
  18 };
  19
  20 // CHECK: Type: struct X1
  21 struct X1 : public X0, public Empty2 {
  22   char x[13];
  23   struct X0 y;
  24 } PACKED;
  25
  26 // CHECK: Type: struct X2
  27 struct PACKED X2 :  public X1, public X0, public Empty1 {
  28   short x;
  29   int y;
  30 };
  31
  32 // CHECK: Type: struct X3
  33 struct PACKED X3 : virtual public X1, public X0 {
  34   short x;
  35   int y;
  36 };
  37
  38 // CHECK: Type: struct X4
  39 struct PACKED X4 {
  40   unsigned int a : 1;
  41   unsigned int b : 1;
  42   unsigned int c : 1;
  43   unsigned int d : 1;
  44   unsigned int e : 1;
  45   unsigned int f : 1;
  46   unsigned int g : 1;
  47   unsigned int h : 1;
  48   unsigned int i : 1;
  49   unsigned int j : 1;
  50   unsigned int k : 1;
  51   unsigned int l : 1;
  52   unsigned int m : 1;
  53   unsigned int n : 1;
  54   X4();
  55 };
  56
  57 // CHECK: Type: struct X5
  58 struct PACKED X5 {
  59   union {
  60     long a;
  61     long b;
  62   };
  63   short l;
  64   short r;
  65 };
  66
  67 // CHECK: Type: struct X6
  68 struct __attribute__((aligned(16))) X6 {
  69   int x;
  70   int y;
  71   virtual ~X6();
  72 };
  73
  74 // CHECK: Type: struct X7
  75 struct X7 {
  76   int z;
  77 };
  78
  79 // CHECK: Type: struct X8
  80 struct X8 : X6, virtual X7 {
  81   char c;
  82 };
  83
  84 void use_structs() {
  85   X0 x0s[sizeof(X0)];
  86   X1 x1s[sizeof(X1)];
  87   X2 x2s[sizeof(X2)];
  88   X3 x3s[sizeof(X3)];
  89   X4 x4s[sizeof(X4)];
  90   X5 x5s[sizeof(X5)];
  91   X6 x6s[sizeof(X6)];
  92   X7 x7s[sizeof(X7)];
  93   X8 x8s[sizeof(X8)];
  94   x4s[1].a = 1;
  95   x5s[1].a = 17;
  96 }