Add DWARF debug info support for C++11 inline namespaces.

This implements the DWARF 5 DW_AT_export_symbols feature:
http://dwarfstd.org/ShowIssue.php?issue=141212.1

<rdar://problem/18616046>

llvm-svn: 285959

1 files changed, 40 insertions, 0 deletions

diff --git a/llvm/test/DebugInfo/X86/inline-namespace.ll b/llvm/test/DebugInfo/X86/inline-namespace.ll
new file mode 100644
index 00000000000..627e6f8931f
--- /dev/null
+++ b/llvm/test/DebugInfo/X86/inline-namespace.ll
@@ -0,0 +1,40 @@
+; RUN: %llc_dwarf %s -o - -filetype=obj | llvm-dwarfdump -debug-dump=info - | FileCheck %s
+; Generated from:
+; namespace normal { inline namespace inlined { int i; } }
+; Check that an inline namespace is emitted with DW_AT_export_symbols
+
+; CHECK: DW_TAG_namespace
+; CHECK-NEXT:   DW_AT_name {{.*}} "normal"
+; CHECK-NOT:    DW_AT_export_symbols
+; CHECK-NOT:    NULL
+; CHECK:        DW_TAG_namespace
+; CHECK-NEXT:     DW_AT_name {{.*}} "inlined"
+; CHECK-NOT:      DW_TAG
+; CHECK-NOT:      NULL
+; CHECK:          DW_AT_export_symbols [DW_FORM_flag_present]	(true)
+; CHECK-NOT:      DW_TAG
+; CHECK:             DW_TAG_variable
+; CHECK-NEXT:        DW_AT_name {{.*}} "i"
+
+source_filename = "namespace.cpp"
+target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-apple-macosx10.12.0"
+
+@_ZN6normal7inlined1iE = global i32 0, align 4, !dbg !0
+
+!llvm.dbg.cu = !{!5}
+!llvm.module.flags = !{!8, !9, !10}
+!llvm.ident = !{!11}
+
+!0 = distinct !DIGlobalVariable(name: "i", linkageName: "_ZN6normal7inlined1iE", scope: !1, file: !2, line: 1, type: !4, isLocal: false, isDefinition: true)
+!1 = !DINamespace(name: "inlined", scope: !3, file: !2, line: 1, exportSymbols: true)
+!2 = !DIFile(filename: "namespace.cpp", directory: "/")
+!3 = !DINamespace(name: "normal", scope: null, file: !2, line: 1)
+!4 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
+!5 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !2, producer: "clang version 4.0.0 (trunk 285825) (llvm/trunk 285822)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !6, globals: !7)
+!6 = !{}
+!7 = !{!0}
+!8 = !{i32 2, !"Dwarf Version", i32 5}
+!9 = !{i32 2, !"Debug Info Version", i32 3}
+!10 = !{i32 1, !"PIC Level", i32 2}
+!11 = !{!"clang version 4.0.0 (trunk 285825) (llvm/trunk 285822)"}