diff --git a/include/llvm/MC/MCAssembler.h b/include/llvm/MC/MCAssembler.h
index 882929f2eee..0a296cd2974 100644
--- a/include/llvm/MC/MCAssembler.h
+++ b/include/llvm/MC/MCAssembler.h
@@ -10,6 +10,7 @@
 #ifndef LLVM_MC_MCASSEMBLER_H
 #define LLVM_MC_MCASSEMBLER_H
 
+#include "llvm/ADT/DenseMap.h"
 #include "llvm/ADT/SmallString.h"
 #include "llvm/ADT/ilist.h"
 #include "llvm/ADT/ilist_node.h"
@@ -587,6 +588,16 @@ private:
 
   iplist<MCSymbolData> Symbols;
 
+  /// The map of sections to their associated assembler backend data.
+  //
+  // FIXME: Avoid this indirection?
+  DenseMap<const MCSection*, MCSectionData*> SectionMap;
+
+  /// The map of symbols to their associated assembler backend data.
+  //
+  // FIXME: Avoid this indirection?
+  DenseMap<const MCSymbol*, MCSymbolData*> SymbolMap;
+
   std::vector<IndirectSymbolData> IndirectSymbols;
 
   unsigned SubsectionsViaSymbols : 1;
@@ -672,6 +683,44 @@ public:
 
   size_t indirect_symbol_size() const { return IndirectSymbols.size(); }
 
+  /// @}
+  /// @name Backend Data Access
+  /// @{
+
+  MCSectionData &getSectionData(const MCSection &Section) {
+    MCSectionData *&Entry = SectionMap[&Section];
+    assert(Entry && "Missing section data!");
+    return *Entry;
+  }
+
+  MCSectionData &getOrCreateSectionData(const MCSection &Section,
+                                        bool *Created = 0) {
+    MCSectionData *&Entry = SectionMap[&Section];
+
+    if (Created) *Created = !Entry;
+    if (!Entry)
+      Entry = new MCSectionData(Section, this);
+
+    return *Entry;
+  }
+
+  MCSymbolData &getSymbolData(const MCSymbol &Symbol) {
+    MCSymbolData *&Entry = SymbolMap[&Symbol];
+    assert(Entry && "Missing symbol data!");
+    return *Entry;
+  }
+
+  MCSymbolData &getOrCreateSymbolData(const MCSymbol &Symbol,
+                                      bool *Created = 0) {
+    MCSymbolData *&Entry = SymbolMap[&Symbol];
+
+    if (Created) *Created = !Entry;
+    if (!Entry)
+      Entry = new MCSymbolData(Symbol, 0, 0, this);
+
+    return *Entry;
+  }
+
   /// @}
 
   void dump();
diff --git a/lib/MC/MCMachOStreamer.cpp b/lib/MC/MCMachOStreamer.cpp
index 9f62efee2f9..a35aae29a8c 100644
--- a/lib/MC/MCMachOStreamer.cpp
+++ b/lib/MC/MCMachOStreamer.cpp
@@ -47,8 +47,6 @@ private:
   MCAssembler Assembler;
   MCCodeEmitter *Emitter;
   MCSectionData *CurSectionData;
-  DenseMap<const MCSection*, MCSectionData*> SectionMap;
-  DenseMap<const MCSymbol*, MCSymbolData*> SymbolMap;
 
 private:
   MCFragment *getCurrentFragment() const {
@@ -60,24 +58,6 @@ private:
     return 0;
   }
 
-  MCSectionData &getSectionData(const MCSection &Section) {
-    MCSectionData *&Entry = SectionMap[&Section];
-
-    if (!Entry)
-      Entry = new MCSectionData(Section, &Assembler);
-
-    return *Entry;
-  }
-
-  MCSymbolData &getSymbolData(const MCSymbol &Symbol) {
-    MCSymbolData *&Entry = SymbolMap[&Symbol];
-
-    if (!Entry)
-      Entry = new MCSymbolData(Symbol, 0, 0, &Assembler);
-
-    return *Entry;
-  }
-
 public:
   MCMachOStreamer(MCContext &Context, raw_ostream &_OS, MCCodeEmitter *_Emitter)
     : MCStreamer(Context), Assembler(Context, _OS), Emitter(_Emitter),
@@ -98,7 +78,8 @@ public:
     }
 
     case MCExpr::SymbolRef:
-      getSymbolData(cast<MCSymbolRefExpr>(Value)->getSymbol());
+      Assembler.getOrCreateSymbolData(
+        cast<MCSymbolRefExpr>(Value)->getSymbol());
       break;
 
     case MCExpr::Unary:
@@ -163,7 +144,7 @@ void MCMachOStreamer::SwitchSection(const MCSection *Section) {
   if (Section == CurSection) return;
 
   CurSection = Section;
-  CurSectionData = &getSectionData(*Section);
+  CurSectionData = &Assembler.getOrCreateSectionData(*Section);
 }
 
 void MCMachOStreamer::EmitLabel(MCSymbol *Symbol) {
@@ -174,7 +155,7 @@ void MCMachOStreamer::EmitLabel(MCSymbol *Symbol) {
   if (!F)
     F = new MCDataFragment(CurSectionData);
 
-  MCSymbolData &SD = getSymbolData(*Symbol);
+  MCSymbolData &SD = Assembler.getOrCreateSymbolData(*Symbol);
   assert(!SD.getFragment() && "Unexpected fragment on symbol data!");
   SD.setFragment(F);
   SD.setOffset(F->getContents().size());
@@ -220,9 +201,9 @@ void MCMachOStreamer::EmitSymbolAttribute(MCSymbol *Symbol,
   }
 
   // Adding a symbol attribute always introduces the symbol, note that an
-  // important side effect of calling getSymbolData here is to register the
-  // symbol with the assembler.
-  MCSymbolData &SD = getSymbolData(*Symbol);
+  // important side effect of calling getOrCreateSymbolData here is to register
+  // the symbol with the assembler.
+  MCSymbolData &SD = Assembler.getOrCreateSymbolData(*Symbol);
 
   // The implementation of symbol attributes is designed to match 'as', but it
   // leaves much to desired. It doesn't really make sense to arbitrarily add and
@@ -288,7 +269,7 @@ void MCMachOStreamer::EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {
   // Encode the 'desc' value into the lowest implementation defined bits.
   assert(DescValue == (DescValue & SF_DescFlagsMask) && 
          "Invalid .desc value!");
-  getSymbolData(*Symbol).setFlags(DescValue & SF_DescFlagsMask);
+  Assembler.getOrCreateSymbolData(*Symbol).setFlags(DescValue&SF_DescFlagsMask);
 }
 
 void MCMachOStreamer::EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
@@ -296,14 +277,14 @@ void MCMachOStreamer::EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
   // FIXME: Darwin 'as' does appear to allow redef of a .comm by itself.
   assert(Symbol->isUndefined() && "Cannot define a symbol twice!");
 
-  MCSymbolData &SD = getSymbolData(*Symbol);
+  MCSymbolData &SD = Assembler.getOrCreateSymbolData(*Symbol);
   SD.setExternal(true);
   SD.setCommon(Size, ByteAlignment);
 }
 
 void MCMachOStreamer::EmitZerofill(const MCSection *Section, MCSymbol *Symbol,
                                    unsigned Size, unsigned ByteAlignment) {
-  MCSectionData &SectData = getSectionData(*Section);
+  MCSectionData &SectData = Assembler.getOrCreateSectionData(*Section);
 
   // The symbol may not be present, which only creates the section.
   if (!Symbol)
@@ -313,7 +294,7 @@ void MCMachOStreamer::EmitZerofill(const MCSection *Section, MCSymbol *Symbol,
 
   assert(Symbol->isUndefined() && "Cannot define a symbol twice!");
 
-  MCSymbolData &SD = getSymbolData(*Symbol);
+  MCSymbolData &SD = Assembler.getOrCreateSymbolData(*Symbol);
 
   MCFragment *F = new MCZeroFillFragment(Size, ByteAlignment, &SectData);
   SD.setFragment(F);