clang/test/CodeGen/debug-info-packed-struct.c

   1 // RUN: %clang_cc1 -x c -debug-info-kind=limited -emit-llvm -triple x86_64-apple-darwin -o - %s | FileCheck %s
   2
   3 // CHECK: %struct.layout3 = type <{ i8, [3 x i8], %struct.size8_pack4, i8, [3 x i8] }>
   4 // CHECK: %struct.layout0 = type { i8, %struct.size8, i8 }
   5 // CHECK: %struct.layout1 = type <{ i8, %struct.size8_anon, i8, [2 x i8] }>
   6 // CHECK: %struct.layout2 = type <{ i8, %struct.size8_pack1, i8 }>
   7
   8 // ---------------------------------------------------------------------
   9 // Not packed.
  10 // ---------------------------------------------------------------------
  11 struct size8 {
  12   int i : 4;
  13   long long l : 60;
  14 };
  15 struct layout0 {
  16   char l0_ofs0;
  17   struct size8 l0_ofs8;
  18   int l0_ofs16 : 1;
  19 };
  20 // CHECK: l0_ofs0
  21 // CHECK: !DIDerivedType(tag: DW_TAG_member, name: "l0_ofs8",
  22 // CHECK-SAME:     {{.*}}size: 64, offset: 64)
  23 // CHECK: !DIDerivedType(tag: DW_TAG_member, name: "l0_ofs16",
  24 // CHECK-SAME:     {{.*}}size: 1, offset: 128, flags: DIFlagBitField, extraData: i64 128)
  25
  26
  27 // ---------------------------------------------------------------------
  28 // Implicitly packed.
  29 // ---------------------------------------------------------------------
  30 struct size8_anon {
  31   int : 4;
  32   long long : 60;
  33 };
  34 struct layout1 {
  35   char l1_ofs0;
  36   struct size8_anon l1_ofs1;
  37   int l1_ofs9 : 1;
  38 };
  39 // CHECK: l1_ofs0
  40 // CHECK: !DIDerivedType(tag: DW_TAG_member, name: "l1_ofs1",
  41 // CHECK-SAME:     {{.*}}size: 64, offset: 8)
  42 // CHECK: !DIDerivedType(tag: DW_TAG_member, name: "l1_ofs9",
  43 // CHECK-SAME:     {{.*}}size: 1, offset: 72, flags: DIFlagBitField, extraData: i64 72)
  44
  45
  46 // ---------------------------------------------------------------------
  47 // Explicitly packed.
  48 // ---------------------------------------------------------------------
  49 #pragma pack(1)
  50 struct size8_pack1 {
  51   int i : 4;
  52   long long l : 60;
  53 };
  54 struct layout2 {
  55   char l2_ofs0;
  56   struct size8_pack1 l2_ofs1;
  57   int l2_ofs9 : 1;
  58 };
  59 #pragma pack()
  60 // CHECK: l2_ofs0
  61 // CHECK: !DIDerivedType(tag: DW_TAG_member, name: "l2_ofs1",
  62 // CHECK-SAME:     {{.*}}size: 64, offset: 8)
  63 // CHECK: !DIDerivedType(tag: DW_TAG_member, name: "l2_ofs9",
  64 // CHECK-SAME:     {{.*}}size: 1, offset: 72, flags: DIFlagBitField, extraData: i64 72)
  65
  66
  67
  68 // ---------------------------------------------------------------------
  69 // Explicitly packed with different alignment.
  70 // ---------------------------------------------------------------------
  71 #pragma pack(4)
  72 struct size8_pack4 {
  73   int i : 4;
  74   long long l : 60;
  75 };
  76 struct layout3 {
  77   char l3_ofs0;
  78   struct size8_pack4 l3_ofs4;
  79   int l3_ofs12 : 1;
  80 };
  81 #pragma pack()
  82 // CHECK: l3_ofs0
  83 // CHECK: !DIDerivedType(tag: DW_TAG_member, name: "l3_ofs4",
  84 // CHECK-SAME:     {{.*}}size: 64, offset: 32)
  85 // CHECK: !DIDerivedType(tag: DW_TAG_member, name: "l3_ofs12",
  86 // CHECK-SAME:     {{.*}}size: 1, offset: 96, flags: DIFlagBitField, extraData: i64 96)
  87
  88 struct layout3 l3;
  89 struct layout0 l0;
  90 struct layout1 l1;
  91 struct layout2 l2;