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      1 ; REQUIRES: object-emission
      2 
      3 ; RUN: %llc_dwarf -O0 -filetype=obj < %s > %t
      4 ; RUN: llvm-dwarfdump %t | FileCheck %s
      5 ; CHECK: debug_info contents
      6 ; CHECK: [[NS1:0x[0-9a-f]*]]:{{ *}}DW_TAG_namespace
      7 ; CHECK-NEXT: DW_AT_name{{.*}} = "A"
      8 ; CHECK-NEXT: DW_AT_decl_file{{.*}}([[F1:".*debug-info-namespace.cpp"]])
      9 ; CHECK-NEXT: DW_AT_decl_line{{.*}}(5)
     10 ; CHECK-NOT: NULL
     11 ; CHECK: [[NS2:0x[0-9a-f]*]]:{{ *}}DW_TAG_namespace
     12 ; CHECK-NEXT: DW_AT_name{{.*}} = "B"
     13 ; CHECK-NEXT: DW_AT_decl_file{{.*}}([[F2:".*foo.cpp"]])
     14 ; CHECK-NEXT: DW_AT_decl_line{{.*}}(1)
     15 ; CHECK-NOT: NULL
     16 ; CHECK: [[I:0x[0-9a-f]*]]:{{ *}}DW_TAG_variable
     17 ; CHECK-NEXT: DW_AT_name{{.*}}= "i"
     18 ; CHECK: [[VAR_FWD:0x[0-9a-f]*]]:{{ *}}DW_TAG_variable
     19 ; CHECK-NEXT: DW_AT_name{{.*}}= "var_fwd"
     20 ; CHECK-NOT: NULL
     21 ; CHECK: [[FOO:0x[0-9a-f]*]]:{{ *}}DW_TAG_structure_type
     22 ; CHECK-NEXT: DW_AT_name{{.*}}= "foo"
     23 ; CHECK-NEXT: DW_AT_declaration
     24 ; CHECK-NOT: NULL
     25 ; CHECK: [[BAR:0x[0-9a-f]*]]:{{ *}}DW_TAG_structure_type
     26 ; CHECK-NEXT: DW_AT_name{{.*}}= "bar"
     27 ; CHECK: [[FUNC1:.*]]: DW_TAG_subprogram
     28 ; CHECK-NOT: DW_TAG
     29 ; CHECK: DW_AT_MIPS_linkage_name
     30 ; CHECK-NOT: DW_TAG
     31 ; CHECK: DW_AT_name{{.*}}= "f1"
     32 ; CHECK: [[BAZ:0x[0-9a-f]*]]:{{.*}}DW_TAG_typedef
     33 ; CHECK-NOT: DW_TAG
     34 ; CHECK: DW_AT_name{{.*}}= "baz"
     35 ; CHECK: [[VAR_DECL:0x[0-9a-f]*]]:{{.*}}DW_TAG_variable
     36 ; CHECK-NOT: DW_TAG
     37 ; CHECK: DW_AT_name{{.*}}= "var_decl"
     38 ; CHECK-NOT: DW_TAG
     39 ; CHECK: DW_AT_declaration
     40 ; CHECK: [[FUNC_DECL:0x[0-9a-f]*]]:{{.*}}DW_TAG_subprogram
     41 ; CHECK-NOT: DW_TAG
     42 ; CHECK: DW_AT_name{{.*}}= "func_decl"
     43 ; CHECK-NOT: DW_TAG
     44 ; CHECK: DW_AT_declaration
     45 ; CHECK: [[FUNC_FWD:0x[0-9a-f]*]]:{{.*}}DW_TAG_subprogram
     46 ; CHECK-NOT: DW_TAG
     47 ; CHECK: DW_AT_name{{.*}}= "func_fwd"
     48 ; CHECK-NOT: DW_AT_declaration
     49 ; CHECK: DW_TAG_subprogram
     50 ; CHECK-NOT: DW_TAG
     51 ; CHECK: DW_AT_MIPS_linkage_name
     52 ; CHECK-NOT: DW_TAG
     53 ; CHECK: DW_AT_name{{.*}}= "f1"
     54 ; CHECK: NULL
     55 
     56 ; CHECK-NOT: NULL
     57 ; CHECK: DW_TAG_imported_module
     58 ; This is a bug, it should be in F2 but it inherits the file from its
     59 ; enclosing scope
     60 ; CHECK-NEXT: DW_AT_decl_file{{.*}}([[F1]])
     61 ; CHECK-NEXT: DW_AT_decl_line{{.*}}(15)
     62 ; CHECK-NEXT: DW_AT_import{{.*}}=> {[[NS2]]})
     63 ; CHECK: NULL
     64 ; CHECK-NOT: NULL
     65 
     66 ; CHECK: DW_TAG_imported_module
     67 ; Same bug as above, this should be F2, not F1
     68 ; CHECK-NEXT: DW_AT_decl_file{{.*}}([[F1]])
     69 ; CHECK-NEXT: DW_AT_decl_line{{.*}}(18)
     70 ; CHECK-NEXT: DW_AT_import{{.*}}=> {[[NS1]]})
     71 ; CHECK-NOT: NULL
     72 
     73 ; CHECK: DW_TAG_subprogram
     74 ; CHECK-NOT: DW_TAG
     75 ; CHECK: DW_AT_MIPS_linkage_name
     76 ; CHECK-NOT: DW_TAG
     77 ; CHECK: DW_AT_name{{.*}}= "func"
     78 ; CHECK-NOT: NULL
     79 ; CHECK: DW_TAG_imported_module
     80 ; CHECK-NEXT: DW_AT_decl_file{{.*}}([[F2]])
     81 ; CHECK-NEXT: DW_AT_decl_line{{.*}}(26)
     82 ; CHECK-NEXT: DW_AT_import{{.*}}=> {[[NS1]]})
     83 ; CHECK-NOT: NULL
     84 ; CHECK: DW_TAG_imported_declaration
     85 ; CHECK-NEXT: DW_AT_decl_file{{.*}}([[F2]])
     86 ; CHECK-NEXT: DW_AT_decl_line{{.*}}(27)
     87 ; CHECK-NEXT: DW_AT_import{{.*}}=> {[[FOO]]})
     88 ; CHECK-NOT: NULL
     89 ; CHECK: DW_TAG_imported_declaration
     90 ; CHECK-NEXT: DW_AT_decl_file{{.*}}([[F2]])
     91 ; CHECK-NEXT: DW_AT_decl_line{{.*}}(28)
     92 ; CHECK-NEXT: DW_AT_import{{.*}}=> {[[BAR]]})
     93 ; CHECK-NOT: NULL
     94 ; CHECK: DW_TAG_imported_declaration
     95 ; CHECK-NEXT: DW_AT_decl_file{{.*}}([[F2]])
     96 ; CHECK-NEXT: DW_AT_decl_line{{.*}}(29)
     97 ; CHECK-NEXT: DW_AT_import{{.*}}=> {[[FUNC1]]})
     98 ; CHECK-NOT: NULL
     99 ; CHECK: DW_TAG_imported_declaration
    100 ; CHECK-NEXT: DW_AT_decl_file{{.*}}([[F2]])
    101 ; CHECK-NEXT: DW_AT_decl_line{{.*}}(30)
    102 ; CHECK-NEXT: DW_AT_import{{.*}}=> {[[I]]})
    103 ; CHECK-NOT: NULL
    104 ; CHECK: DW_TAG_imported_declaration
    105 ; CHECK-NEXT: DW_AT_decl_file{{.*}}([[F2]])
    106 ; CHECK-NEXT: DW_AT_decl_line{{.*}}(31)
    107 ; CHECK-NEXT: DW_AT_import{{.*}}=> {[[BAZ]]})
    108 ; CHECK-NOT: NULL
    109 ; CHECK: [[X:0x[0-9a-f]*]]:{{ *}}DW_TAG_imported_declaration
    110 ; CHECK-NEXT: DW_AT_decl_file{{.*}}([[F2]])
    111 ; CHECK-NEXT: DW_AT_decl_line{{.*}}(32)
    112 ; CHECK-NEXT: DW_AT_import{{.*}}=> {[[NS1]]})
    113 ; CHECK-NEXT: DW_AT_name{{.*}}"X"
    114 ; CHECK-NOT: NULL
    115 ; CHECK: DW_TAG_imported_declaration
    116 ; CHECK-NEXT: DW_AT_decl_file{{.*}}([[F2]])
    117 ; CHECK-NEXT: DW_AT_decl_line{{.*}}(33)
    118 ; CHECK-NEXT: DW_AT_import{{.*}}=> {[[X]]})
    119 ; CHECK-NEXT: DW_AT_name{{.*}}"Y"
    120 ; CHECK-NOT: NULL
    121 ; CHECK: DW_TAG_imported_declaration
    122 ; CHECK-NEXT: DW_AT_decl_file{{.*}}([[F2]])
    123 ; CHECK-NEXT: DW_AT_decl_line{{.*}}(34)
    124 ; CHECK-NEXT: DW_AT_import{{.*}}=> {[[VAR_DECL]]})
    125 ; CHECK: DW_TAG_imported_declaration
    126 ; CHECK-NEXT: DW_AT_decl_file{{.*}}([[F2]])
    127 ; CHECK-NEXT: DW_AT_decl_line{{.*}}(35)
    128 ; CHECK-NEXT: DW_AT_import{{.*}}=> {[[FUNC_DECL]]})
    129 ; CHECK: DW_TAG_imported_declaration
    130 ; CHECK-NEXT: DW_AT_decl_file{{.*}}([[F2]])
    131 ; CHECK-NEXT: DW_AT_decl_line{{.*}}(36)
    132 ; CHECK-NEXT: DW_AT_import{{.*}}=> {[[VAR_FWD]]})
    133 ; CHECK: DW_TAG_imported_declaration
    134 ; CHECK-NEXT: DW_AT_decl_file{{.*}}([[F2]])
    135 ; CHECK-NEXT: DW_AT_decl_line{{.*}}(37)
    136 ; CHECK-NEXT: DW_AT_import{{.*}}=> {[[FUNC_FWD]]})
    137 
    138 ; CHECK: DW_TAG_lexical_block
    139 ; CHECK-NOT: NULL
    140 ; CHECK: DW_TAG_imported_module
    141 ; CHECK-NEXT: DW_AT_decl_file{{.*}}([[F2]])
    142 ; CHECK-NEXT: DW_AT_decl_line{{.*}}(23)
    143 ; CHECK-NEXT: DW_AT_import{{.*}}=>
    144 ; CHECK: NULL
    145 ; CHECK: NULL
    146 ; CHECK: NULL
    147 
    148 ; IR generated from clang/test/CodeGenCXX/debug-info-namespace.cpp, file paths
    149 ; changed to protect the guilty. The C++ source code is:
    150 ; // RUN...
    151 ; // RUN...
    152 ; // RUN...
    153 ;
    154 ; namespace A {
    155 ; #line 1 "foo.cpp"
    156 ; namespace B {
    157 ; extern int i;
    158 ; int f1() { return 0; }
    159 ; void f1(int) { }
    160 ; struct foo;
    161 ; struct bar { };
    162 ; typedef bar baz;
    163 ; extern int var_decl;
    164 ; void func_decl(void);
    165 ; extern int var_fwd;
    166 ; void func_fwd(void);
    167 ; }
    168 ; }
    169 ; namespace A {
    170 ; using namespace B;
    171 ; }
    172 ;
    173 ; using namespace A;
    174 ; namespace E = A;
    175 ; int B::i = f1();
    176 ; int func(bool b) {
    177 ;   if (b) {
    178 ;     using namespace A::B;
    179 ;     return i;
    180 ;   }
    181 ;   using namespace A;
    182 ;   using B::foo;
    183 ;   using B::bar;
    184 ;   using B::f1;
    185 ;   using B::i;
    186 ;   using B::baz;
    187 ;   namespace X = A;
    188 ;   namespace Y = X;
    189 ;   using B::var_decl;
    190 ;   using B::func_decl;
    191 ;   using B::var_fwd;
    192 ;   using B::func_fwd;
    193 ;   return i + X::B::i + Y::B::i;
    194 ; }
    195 ;
    196 ; namespace A {
    197 ; using B::i;
    198 ; namespace B {
    199 ; int var_fwd = i;
    200 ; }
    201 ; }
    202 ; void B::func_fwd() {}
    203 
    204 @_ZN1A1B1iE = global i32 0, align 4
    205 @_ZN1A1B7var_fwdE = global i32 0, align 4
    206 @llvm.global_ctors = appending global [1 x { i32, void ()*, i8* }] [{ i32, void ()*, i8* } { i32 65535, void ()* @_GLOBAL__sub_I_debug_info_namespace.cpp, i8* null }]
    207 
    208 ; Function Attrs: nounwind ssp uwtable
    209 define i32 @_ZN1A1B2f1Ev() #0 {
    210 entry:
    211   ret i32 0, !dbg !60
    212 }
    213 
    214 ; Function Attrs: nounwind ssp uwtable
    215 define void @_ZN1A1B2f1Ei(i32) #0 {
    216 entry:
    217   %.addr = alloca i32, align 4
    218   store i32 %0, i32* %.addr, align 4
    219   call void @llvm.dbg.declare(metadata i32* %.addr, metadata !61, metadata !62), !dbg !63
    220   ret void, !dbg !64
    221 }
    222 
    223 ; Function Attrs: nounwind readnone
    224 declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
    225 
    226 define internal void @__cxx_global_var_init() section "__TEXT,__StaticInit,regular,pure_instructions" {
    227 entry:
    228   %call = call i32 @_ZN1A1B2f1Ev(), !dbg !65
    229   store i32 %call, i32* @_ZN1A1B1iE, align 4, !dbg !65
    230   ret void, !dbg !65
    231 }
    232 
    233 ; Function Attrs: nounwind ssp uwtable
    234 define i32 @_Z4funcb(i1 zeroext %b) #0 {
    235 entry:
    236   %retval = alloca i32, align 4
    237   %b.addr = alloca i8, align 1
    238   %frombool = zext i1 %b to i8
    239   store i8 %frombool, i8* %b.addr, align 1
    240   call void @llvm.dbg.declare(metadata i8* %b.addr, metadata !66, metadata !62), !dbg !67
    241   %0 = load i8, i8* %b.addr, align 1, !dbg !68
    242   %tobool = trunc i8 %0 to i1, !dbg !68
    243   br i1 %tobool, label %if.then, label %if.end, !dbg !68
    244 
    245 if.then:                                          ; preds = %entry
    246   %1 = load i32, i32* @_ZN1A1B1iE, align 4, !dbg !69
    247   store i32 %1, i32* %retval, !dbg !69
    248   br label %return, !dbg !69
    249 
    250 if.end:                                           ; preds = %entry
    251   %2 = load i32, i32* @_ZN1A1B1iE, align 4, !dbg !70
    252   %3 = load i32, i32* @_ZN1A1B1iE, align 4, !dbg !70
    253   %add = add nsw i32 %2, %3, !dbg !70
    254   %4 = load i32, i32* @_ZN1A1B1iE, align 4, !dbg !70
    255   %add1 = add nsw i32 %add, %4, !dbg !70
    256   store i32 %add1, i32* %retval, !dbg !70
    257   br label %return, !dbg !70
    258 
    259 return:                                           ; preds = %if.end, %if.then
    260   %5 = load i32, i32* %retval, !dbg !71
    261   ret i32 %5, !dbg !71
    262 }
    263 
    264 define internal void @__cxx_global_var_init1() section "__TEXT,__StaticInit,regular,pure_instructions" {
    265 entry:
    266   %0 = load i32, i32* @_ZN1A1B1iE, align 4, !dbg !72
    267   store i32 %0, i32* @_ZN1A1B7var_fwdE, align 4, !dbg !72
    268   ret void, !dbg !72
    269 }
    270 
    271 ; Function Attrs: nounwind ssp uwtable
    272 define void @_ZN1A1B8func_fwdEv() #0 {
    273 entry:
    274   ret void, !dbg !73
    275 }
    276 
    277 define internal void @_GLOBAL__sub_I_debug_info_namespace.cpp() section "__TEXT,__StaticInit,regular,pure_instructions" {
    278 entry:
    279   call void @__cxx_global_var_init(), !dbg !74
    280   call void @__cxx_global_var_init1(), !dbg !74
    281   ret void, !dbg !74
    282 }
    283 
    284 attributes #0 = { nounwind ssp uwtable "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
    285 attributes #1 = { nounwind readnone }
    286 
    287 !llvm.dbg.cu = !{!0}
    288 !llvm.module.flags = !{!57, !58}
    289 !llvm.ident = !{!59}
    290 
    291 !0 = !MDCompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.6.0 ", isOptimized: false, emissionKind: 1, file: !1, enums: !2, retainedTypes: !3, subprograms: !9, globals: !30, imports: !33)
    292 !1 = !MDFile(filename: "debug-info-namespace.cpp", directory: "/tmp")
    293 !2 = !{}
    294 !3 = !{!4, !8}
    295 !4 = !MDCompositeType(tag: DW_TAG_structure_type, name: "foo", line: 5, flags: DIFlagFwdDecl, file: !5, scope: !6, identifier: "_ZTSN1A1B3fooE")
    296 !5 = !MDFile(filename: "foo.cpp", directory: "/tmp")
    297 !6 = !MDNamespace(name: "B", line: 1, file: !5, scope: !7)
    298 !7 = !MDNamespace(name: "A", line: 5, file: !1, scope: null)
    299 !8 = !MDCompositeType(tag: DW_TAG_structure_type, name: "bar", line: 6, size: 8, align: 8, file: !5, scope: !6, elements: !2, identifier: "_ZTSN1A1B3barE")
    300 !9 = !{!10, !14, !17, !21, !25, !26, !27}
    301 !10 = !MDSubprogram(name: "f1", linkageName: "_ZN1A1B2f1Ev", line: 3, isLocal: false, isDefinition: true, flags: DIFlagPrototyped, isOptimized: false, scopeLine: 3, file: !5, scope: !6, type: !11, function: i32 ()* @_ZN1A1B2f1Ev, variables: !2)
    302 !11 = !MDSubroutineType(types: !12)
    303 !12 = !{!13}
    304 !13 = !MDBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
    305 !14 = !MDSubprogram(name: "f1", linkageName: "_ZN1A1B2f1Ei", line: 4, isLocal: false, isDefinition: true, flags: DIFlagPrototyped, isOptimized: false, scopeLine: 4, file: !5, scope: !6, type: !15, function: void (i32)* @_ZN1A1B2f1Ei, variables: !2)
    306 !15 = !MDSubroutineType(types: !16)
    307 !16 = !{null, !13}
    308 !17 = !MDSubprogram(name: "__cxx_global_var_init", line: 20, isLocal: true, isDefinition: true, flags: DIFlagPrototyped, isOptimized: false, scopeLine: 20, file: !5, scope: !18, type: !19, function: void ()* @__cxx_global_var_init, variables: !2)
    309 !18 = !MDFile(filename: "foo.cpp", directory: "/tmp")
    310 !19 = !MDSubroutineType(types: !20)
    311 !20 = !{null}
    312 !21 = !MDSubprogram(name: "func", linkageName: "_Z4funcb", line: 21, isLocal: false, isDefinition: true, flags: DIFlagPrototyped, isOptimized: false, scopeLine: 21, file: !5, scope: !18, type: !22, function: i32 (i1)* @_Z4funcb, variables: !2)
    313 !22 = !MDSubroutineType(types: !23)
    314 !23 = !{!13, !24}
    315 !24 = !MDBasicType(tag: DW_TAG_base_type, name: "bool", size: 8, align: 8, encoding: DW_ATE_boolean)
    316 !25 = !MDSubprogram(name: "__cxx_global_var_init1", line: 44, isLocal: true, isDefinition: true, flags: DIFlagPrototyped, isOptimized: false, scopeLine: 44, file: !5, scope: !18, type: !19, function: void ()* @__cxx_global_var_init1, variables: !2)
    317 !26 = !MDSubprogram(name: "func_fwd", linkageName: "_ZN1A1B8func_fwdEv", line: 47, isLocal: false, isDefinition: true, flags: DIFlagPrototyped, isOptimized: false, scopeLine: 47, file: !5, scope: !6, type: !19, function: void ()* @_ZN1A1B8func_fwdEv, variables: !2)
    318 !27 = !MDSubprogram(name: "", linkageName: "_GLOBAL__sub_I_debug_info_namespace.cpp", isLocal: true, isDefinition: true, flags: DIFlagArtificial, isOptimized: false, file: !1, scope: !28, type: !29, function: void ()* @_GLOBAL__sub_I_debug_info_namespace.cpp, variables: !2)
    319 !28 = !MDFile(filename: "debug-info-namespace.cpp", directory: "/tmp")
    320 !29 = !MDSubroutineType(types: !2)
    321 !30 = !{!31, !32}
    322 !31 = !MDGlobalVariable(name: "i", linkageName: "_ZN1A1B1iE", line: 20, isLocal: false, isDefinition: true, scope: !6, file: !18, type: !13, variable: i32* @_ZN1A1B1iE)
    323 !32 = !MDGlobalVariable(name: "var_fwd", linkageName: "_ZN1A1B7var_fwdE", line: 44, isLocal: false, isDefinition: true, scope: !6, file: !18, type: !13, variable: i32* @_ZN1A1B7var_fwdE)
    324 !33 = !{!34, !35, !36, !37, !40, !41, !42, !43, !44, !45, !47, !48, !49, !51, !54, !55, !56}
    325 !34 = !MDImportedEntity(tag: DW_TAG_imported_module, line: 15, scope: !7, entity: !6)
    326 !35 = !MDImportedEntity(tag: DW_TAG_imported_module, line: 18, scope: !0, entity: !7)
    327 !36 = !MDImportedEntity(tag: DW_TAG_imported_declaration, line: 19, name: "E", scope: !0, entity: !7)
    328 !37 = !MDImportedEntity(tag: DW_TAG_imported_module, line: 23, scope: !38, entity: !6)
    329 !38 = distinct !MDLexicalBlock(line: 22, column: 10, file: !5, scope: !39)
    330 !39 = distinct !MDLexicalBlock(line: 22, column: 7, file: !5, scope: !21)
    331 !40 = !MDImportedEntity(tag: DW_TAG_imported_module, line: 26, scope: !21, entity: !7)
    332 !41 = !MDImportedEntity(tag: DW_TAG_imported_declaration, line: 27, scope: !21, entity: !"_ZTSN1A1B3fooE")
    333 !42 = !MDImportedEntity(tag: DW_TAG_imported_declaration, line: 28, scope: !21, entity: !"_ZTSN1A1B3barE")
    334 !43 = !MDImportedEntity(tag: DW_TAG_imported_declaration, line: 29, scope: !21, entity: !14)
    335 !44 = !MDImportedEntity(tag: DW_TAG_imported_declaration, line: 30, scope: !21, entity: !31)
    336 !45 = !MDImportedEntity(tag: DW_TAG_imported_declaration, line: 31, scope: !21, entity: !46)
    337 !46 = !MDDerivedType(tag: DW_TAG_typedef, name: "baz", line: 7, file: !5, scope: !6, baseType: !"_ZTSN1A1B3barE")
    338 !47 = !MDImportedEntity(tag: DW_TAG_imported_declaration, line: 32, name: "X", scope: !21, entity: !7)
    339 !48 = !MDImportedEntity(tag: DW_TAG_imported_declaration, line: 33, name: "Y", scope: !21, entity: !47)
    340 !49 = !MDImportedEntity(tag: DW_TAG_imported_declaration, line: 34, scope: !21, entity: !50)
    341 !50 = !MDGlobalVariable(name: "var_decl", linkageName: "_ZN1A1B8var_declE", line: 8, isLocal: false, isDefinition: false, scope: !6, file: !18, type: !13)
    342 !51 = !MDImportedEntity(tag: DW_TAG_imported_declaration, line: 35, scope: !21, entity: !52)
    343 !52 = !MDSubprogram(name: "func_decl", linkageName: "_ZN1A1B9func_declEv", line: 9, isLocal: false, isDefinition: false, flags: DIFlagPrototyped, isOptimized: false, file: !5, scope: !6, type: !19, variables: !53)
    344 !53 = !{} ; previously: invalid DW_TAG_base_type
    345 !54 = !MDImportedEntity(tag: DW_TAG_imported_declaration, line: 36, scope: !21, entity: !32)
    346 !55 = !MDImportedEntity(tag: DW_TAG_imported_declaration, line: 37, scope: !21, entity: !26)
    347 !56 = !MDImportedEntity(tag: DW_TAG_imported_declaration, line: 42, scope: !7, entity: !31)
    348 !57 = !{i32 2, !"Dwarf Version", i32 2}
    349 !58 = !{i32 2, !"Debug Info Version", i32 3}
    350 !59 = !{!"clang version 3.6.0 "}
    351 !60 = !MDLocation(line: 3, column: 12, scope: !10)
    352 !61 = !MDLocalVariable(tag: DW_TAG_arg_variable, name: "", line: 4, arg: 1, scope: !14, file: !18, type: !13)
    353 !62 = !MDExpression()
    354 !63 = !MDLocation(line: 4, column: 12, scope: !14)
    355 !64 = !MDLocation(line: 4, column: 16, scope: !14)
    356 !65 = !MDLocation(line: 20, column: 12, scope: !17)
    357 !66 = !MDLocalVariable(tag: DW_TAG_arg_variable, name: "b", line: 21, arg: 1, scope: !21, file: !18, type: !24)
    358 !67 = !MDLocation(line: 21, column: 15, scope: !21)
    359 !68 = !MDLocation(line: 22, column: 7, scope: !21)
    360 !69 = !MDLocation(line: 24, column: 5, scope: !38)
    361 !70 = !MDLocation(line: 38, column: 3, scope: !21)
    362 !71 = !MDLocation(line: 39, column: 1, scope: !21)
    363 !72 = !MDLocation(line: 44, column: 15, scope: !25)
    364 !73 = !MDLocation(line: 47, column: 21, scope: !26)
    365 !74 = !MDLocation(line: 0, scope: !75)
    366 !75 = !MDLexicalBlockFile(discriminator: 0, file: !5, scope: !27)
    367