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

2 files changed, 23 insertions, 0 deletions

diff --git a/llvm/test/Bitcode/DINamespace.ll b/llvm/test/Bitcode/DINamespace.ll
new file mode 100644
index 00000000000..2807cb02d3d
--- /dev/null
+++ b/llvm/test/Bitcode/DINamespace.ll
@@ -0,0 +1,23 @@
+; RUN: llvm-dis %s.bc -o - | FileCheck %s
+target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-apple-macosx10.12.0"
+
+@_ZN1N1iE = global i32 0, align 4, !dbg !0
+
+!llvm.dbg.cu = !{!4}
+!llvm.module.flags = !{!7, !8, !9}
+!llvm.ident = !{!10}
+
+!0 = distinct !DIGlobalVariable(name: "i", linkageName: "_ZN1N1iE", scope: !1, file: !2, line: 2, type: !3, isLocal: false, isDefinition: true)
+; Test bitcode upgrade for DINamespace without an exportSymbols field.
+; CHECK: !DINamespace(name: "N", scope: null, file: !{{[0-9]+}}, line: 1)
+!1 = !DINamespace(name: "N", scope: null, file: !2, line: 1)
+!2 = !DIFile(filename: "dinamespace.cpp", directory: "/")
+!3 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
+!4 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !2, producer: "clang version 4.0.0 (trunk 283228) (llvm/trunk 283225)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !5, globals: !6)
+!5 = !{}
+!6 = !{!0}
+!7 = !{i32 2, !"Dwarf Version", i32 4}
+!8 = !{i32 2, !"Debug Info Version", i32 3}
+!9 = !{i32 1, !"PIC Level", i32 2}
+!10 = !{!"clang version 4.0.0 (trunk 283228) (llvm/trunk 283225)"}
diff --git a/llvm/test/Bitcode/DINamespace.ll.bc b/llvm/test/Bitcode/DINamespace.ll.bc
new file mode 100644
index 00000000000..90ccb8c783a
--- /dev/null
+++ b/llvm/test/Bitcode/DINamespace.ll.bc