Introduce the DWARFUnitSection abstraction.

A DWARFUnitSection is the collection of Units that have been extracted from
the same debug section.

By embeding a reference to their DWARFUnitSection in each unit, the DIEs
will be able to resolve inter-unit references by interrogating their Unit's
DWARFUnitSection.

This is a minimal patch where the DWARFUnitSection is-a SmallVector of Units,
thus exposing exactly the same interface as before. Followup-up patches might
change from inheritance to composition in order to expose only the wanted
DWARFUnitSection abstraction.

    Differential Revision: http://reviews.llvm.org/D5310

llvm-svn: 217747

1 files changed, 3 insertions, 2 deletions

diff --git a/llvm/lib/DebugInfo/DWARFCompileUnit.h b/llvm/lib/DebugInfo/DWARFCompileUnit.h
index bf875fbe41f..47c7191d96e 100644
--- a/llvm/lib/DebugInfo/DWARFCompileUnit.h
+++ b/llvm/lib/DebugInfo/DWARFCompileUnit.h
@@ -18,8 +18,9 @@ class DWARFCompileUnit : public DWARFUnit {
 public:
   DWARFCompileUnit(DWARFContext& Context, const DWARFDebugAbbrev *DA,
                    StringRef IS, StringRef RS, StringRef SS, StringRef SOS,
-                   StringRef AOS, const RelocAddrMap *M, bool LE)
-    : DWARFUnit(Context, DA, IS, RS, SS, SOS, AOS, M, LE) {}
+                   StringRef AOS, const RelocAddrMap *M, bool LE,
+                   const DWARFUnitSectionBase &UnitSection)
+    : DWARFUnit(Context, DA, IS, RS, SS, SOS, AOS, M, LE, UnitSection) {}
   void dump(raw_ostream &OS);
   // VTable anchor.
   ~DWARFCompileUnit() override;