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      1 // RUN: %clang_cc1 -debug-info-kind=limited -S -emit-llvm %s -o - | FileCheck %s
      2 // RUN: %clang_cc1 -debug-info-kind=line-tables-only -S -emit-llvm %s -o - | FileCheck -check-prefix=CHECK-GMLT %s
      3 // RUN: %clang_cc1 -debug-info-kind=standalone -S -emit-llvm %s -o - | FileCheck -check-prefix=CHECK-NOLIMIT %s
      4 
      5 namespace A {
      6 #line 1 "foo.cpp"
      7 namespace B {
      8 extern int i;
      9 int f1() { return 0; }
     10 void f1(int) { }
     11 struct foo;
     12 struct bar { };
     13 typedef bar baz;
     14 extern int var_decl;
     15 void func_decl(void);
     16 extern int var_fwd;
     17 void func_fwd(void);
     18 }
     19 }
     20 namespace A {
     21 using namespace B;
     22 }
     23 
     24 using namespace A;
     25 namespace E = A;
     26 int B::i = f1();
     27 int func(bool b) {
     28   if (b) {
     29     using namespace A::B;
     30     return i;
     31   }
     32   using namespace A;
     33   using B::foo;
     34   using B::bar;
     35   using B::f1;
     36   using B::i;
     37   using B::baz;
     38   namespace X = A;
     39   namespace Y = X;
     40   using B::var_decl;
     41   using B::func_decl;
     42   using B::var_fwd;
     43   using B::func_fwd;
     44   return i + X::B::i + Y::B::i;
     45 }
     46 
     47 namespace A {
     48 using B::i;
     49 namespace B {
     50 int var_fwd = i;
     51 }
     52 }
     53 void B::func_fwd() {}
     54 
     55 // This should work even if 'i' and 'func' were declarations & not definitions,
     56 // but it doesn't yet.
     57 
     58 // CHECK: [[CU:![0-9]+]] = distinct !DICompileUnit(
     59 // CHECK-SAME:                            imports: [[MODULES:![0-9]*]]
     60 // CHECK: [[I:![0-9]+]] = distinct !DIGlobalVariable(name: "i",{{.*}} scope: [[NS:![0-9]+]],
     61 // CHECK: [[NS]] = !DINamespace(name: "B", scope: [[CTXT:![0-9]+]], file: [[FOOCPP:![0-9]+]], line: 1)
     62 // CHECK: [[FOOCPP]] = !DIFile(filename: "foo.cpp"
     63 // CHECK: [[CTXT]] = !DINamespace(name: "A", scope: null, file: [[FILE:![0-9]+]], line: 5)
     64 // CHECK: [[FILE]] = !DIFile(filename: "{{.*}}debug-info-namespace.cpp",
     65 // CHECK: [[VAR_FWD:![0-9]+]] = distinct !DIGlobalVariable(name: "var_fwd",{{.*}} scope: [[NS]],
     66 // CHECK-SAME:                                             line: 44
     67 // CHECK-SAME:                                             isDefinition: true
     68 // CHECK: [[MODULES]] = !{[[M1:![0-9]+]], [[M2:![0-9]+]], [[M3:![0-9]+]], [[M4:![0-9]+]], [[M5:![0-9]+]], [[M6:![0-9]+]], [[M7:![0-9]+]], [[M8:![0-9]+]], [[M9:![0-9]+]], [[M10:![0-9]+]], [[M11:![0-9]+]], [[M12:![0-9]+]], [[M13:![0-9]+]], [[M14:![0-9]+]], [[M15:![0-9]+]], [[M16:![0-9]+]], [[M17:![0-9]+]]}
     69 // CHECK: [[M1]] = !DIImportedEntity(tag: DW_TAG_imported_module, scope: [[CTXT]], entity: [[NS]], line: 15)
     70 
     71 // CHECK: [[M2]] = !DIImportedEntity(tag: DW_TAG_imported_module, scope: [[CU]], entity: [[CTXT]],
     72 // CHECK: [[M3]] = !DIImportedEntity(tag: DW_TAG_imported_declaration, name: "E", scope: [[CU]], entity: [[CTXT]], line: 19)
     73 // CHECK: [[M4]] = !DIImportedEntity(tag: DW_TAG_imported_module, scope: [[LEX2:![0-9]+]], entity: [[NS]], line: 23)
     74 // CHECK: [[LEX2]] = distinct !DILexicalBlock(scope: [[LEX1:![0-9]+]], file: [[FOOCPP]],
     75 // CHECK: [[LEX1]] = distinct !DILexicalBlock(scope: [[FUNC:![0-9]+]], file: [[FOOCPP]],
     76 
     77 // CHECK: [[FUNC:![0-9]+]] = distinct !DISubprogram(name: "func",{{.*}} isDefinition: true
     78 // CHECK: [[M5]] = !DIImportedEntity(tag: DW_TAG_imported_module, scope: [[FUNC]], entity: [[CTXT:![0-9]+]],
     79 // CHECK: [[M6]] = !DIImportedEntity(tag: DW_TAG_imported_declaration, scope: [[FUNC]], entity: [[FOO:![0-9]+]], line: 27)
     80 // CHECK: [[FOO]] = !DICompositeType(tag: DW_TAG_structure_type, name: "foo",
     81 // CHECK-SAME:                               line: 5
     82 // CHECK-SAME:                               DIFlagFwdDecl
     83 // CHECK: [[M7]] = !DIImportedEntity(tag: DW_TAG_imported_declaration, scope: [[FUNC]], entity: [[BAR:![0-9]+]]
     84 // CHECK: [[BAR]] = !DICompositeType(tag: DW_TAG_structure_type, name: "bar",
     85 // CHECK-SAME:                               line: 6
     86 // CHECK-SAME:                               DIFlagFwdDecl
     87 
     88 // CHECK: [[M8]] = !DIImportedEntity(tag: DW_TAG_imported_declaration, scope: [[FUNC]], entity: [[F1:![0-9]+]]
     89 // CHECK: [[F1:![0-9]+]] = distinct !DISubprogram(name: "f1",{{.*}} line: 4
     90 // CHECK-SAME:                           isDefinition: true
     91 // CHECK: [[M9]] = !DIImportedEntity(tag: DW_TAG_imported_declaration, scope: [[FUNC]], entity: [[I]]
     92 // CHECK: [[M10]] = !DIImportedEntity(tag: DW_TAG_imported_declaration, scope: [[FUNC]], entity: [[BAZ:![0-9]+]]
     93 // CHECK: [[BAZ]] = !DIDerivedType(tag: DW_TAG_typedef, name: "baz", scope: [[NS]], file: [[FOOCPP]],
     94 // CHECK-SAME:                     baseType: [[BAR]]
     95 // CHECK: [[M11]] = !DIImportedEntity(tag: DW_TAG_imported_declaration, name: "X", scope: [[FUNC]], entity: [[CTXT]]
     96 // CHECK: [[M12]] = !DIImportedEntity(tag: DW_TAG_imported_declaration, name: "Y", scope: [[FUNC]], entity: [[M11]]
     97 // CHECK: [[M13]] = !DIImportedEntity(tag: DW_TAG_imported_declaration, scope: [[FUNC]], entity: [[VAR_DECL:![0-9]+]]
     98 // CHECK: [[VAR_DECL]] = !DIGlobalVariable(name: "var_decl", linkageName: "{{[^"]*var_decl[^"]*}}", scope: [[NS]],{{.*}} line: 8,
     99 // CHECK: [[M14]] = !DIImportedEntity(tag: DW_TAG_imported_declaration, scope: [[FUNC]], entity: [[FUNC_DECL:![0-9]+]]
    100 // CHECK: [[FUNC_DECL]] = !DISubprogram(name: "func_decl",
    101 // CHECK-SAME:                          scope: [[NS]], file: [[FOOCPP]], line: 9
    102 // CHECK: [[M15]] = !DIImportedEntity(tag: DW_TAG_imported_declaration, scope: [[FUNC]], entity: [[VAR_FWD:![0-9]+]]
    103 // CHECK: [[M16]] = !DIImportedEntity(tag: DW_TAG_imported_declaration, scope: [[FUNC]], entity: [[FUNC_FWD:![0-9]+]]
    104 // CHECK: [[FUNC_FWD]] = distinct !DISubprogram(name: "func_fwd",{{.*}} line: 47,{{.*}} isDefinition: true
    105 // CHECK: [[M17]] = !DIImportedEntity(tag: DW_TAG_imported_declaration, scope: [[CTXT]], entity: [[I]]
    106 
    107 // CHECK-GMLT: [[CU:![0-9]+]] = distinct !DICompileUnit(
    108 // CHECK-GMLT-SAME:                            emissionKind: LineTablesOnly,
    109 // CHECK-GMLT-NOT:                             imports:
    110 
    111 // CHECK-NOLIMIT: !DICompositeType(tag: DW_TAG_structure_type, name: "bar",{{.*}} line: 6,
    112 // CHECK-NOLIMIT-NOT:              DIFlagFwdDecl
    113 // CHECK-NOLIMIT-SAME:             ){{$}}
    114