4 files changed, 40 insertions, 22 deletions

diff --git a/include/llvm/MC/MCStreamer.h b/include/llvm/MC/MCStreamer.h
index e53698106f..5c7608be80 100644
--- a/include/llvm/MC/MCStreamer.h
+++ b/include/llvm/MC/MCStreamer.h
@@ -67,6 +67,12 @@ namespace llvm {
   protected:
     MCStreamer(MCContext &Ctx);
 
+    const MCExpr *BuildSymbolDiff(MCContext &Context, const MCSymbol *A,
+                                  const MCSymbol *B);
+
+    const MCExpr *ForceExpAbs(MCStreamer *Streamer, MCContext &Context,
+                              const MCExpr* Expr);
+
   public:
     virtual ~MCStreamer();
 
diff --git a/lib/MC/MCAsmStreamer.cpp b/lib/MC/MCAsmStreamer.cpp
index 7556ba52b7..2538475e4e 100644
--- a/lib/MC/MCAsmStreamer.cpp
+++ b/lib/MC/MCAsmStreamer.cpp
@@ -127,6 +127,8 @@ public:
   virtual void EmitDwarfAdvanceLineAddr(int64_t LineDelta,
                                         const MCSymbol *LastLabel,
                                         const MCSymbol *Label);
+  virtual void EmitDwarfAdvanceFrameAddr(const MCSymbol *LastLabel,
+                                         const MCSymbol *Label);
 
   virtual void EmitSymbolAttribute(MCSymbol *Symbol, MCSymbolAttr Attribute);
 
@@ -324,6 +326,15 @@ void MCAsmStreamer::EmitDwarfAdvanceLineAddr(int64_t LineDelta,
                        getContext().getTargetAsmInfo().getPointerSize());
 }
 
+void MCAsmStreamer::EmitDwarfAdvanceFrameAddr(const MCSymbol *LastLabel,
+                                              const MCSymbol *Label) {
+  EmitIntValue(dwarf::DW_CFA_advance_loc4, 1);
+  const MCExpr *AddrDelta = BuildSymbolDiff(getContext(), Label, LastLabel);
+  AddrDelta = ForceExpAbs(this, getContext(), AddrDelta);
+  EmitValue(AddrDelta, 4);
+}
+
+
 void MCAsmStreamer::EmitSymbolAttribute(MCSymbol *Symbol,
                                         MCSymbolAttr Attribute) {
   switch (Attribute) {
diff --git a/lib/MC/MCObjectStreamer.cpp b/lib/MC/MCObjectStreamer.cpp
index ca1919a11c..cb5eea7e50 100644
--- a/lib/MC/MCObjectStreamer.cpp
+++ b/lib/MC/MCObjectStreamer.cpp
@@ -121,16 +121,6 @@ void MCObjectStreamer::EmitLabel(MCSymbol *Symbol) {
   SD.setOffset(F->getContents().size());
 }
 
-static const MCExpr *ForceExpAbs(MCObjectStreamer *Streamer,
-                                  MCContext &Context, const MCExpr* Expr) {
- if (Context.getAsmInfo().hasAggressiveSymbolFolding())
-   return Expr;
-
- MCSymbol *ABS = Context.CreateTempSymbol();
- Streamer->EmitAssignment(ABS, Expr);
- return MCSymbolRefExpr::Create(ABS, Context);
-}
-
 void MCObjectStreamer::EmitULEB128Value(const MCExpr *Value) {
   int64_t IntValue;
   if (Value->EvaluateAsAbsolute(IntValue, getAssembler())) {
@@ -205,18 +195,6 @@ void MCObjectStreamer::EmitInstToFragment(const MCInst &Inst) {
   IF->getCode().append(Code.begin(), Code.end());
 }
 
-static const MCExpr *BuildSymbolDiff(MCContext &Context,
-                                     const MCSymbol *A, const MCSymbol *B) {
-  MCSymbolRefExpr::VariantKind Variant = MCSymbolRefExpr::VK_None;
-  const MCExpr *ARef =
-    MCSymbolRefExpr::Create(A, Variant, Context);
-  const MCExpr *BRef =
-    MCSymbolRefExpr::Create(B, Variant, Context);
-  const MCExpr *AddrDelta =
-    MCBinaryExpr::Create(MCBinaryExpr::Sub, ARef, BRef, Context);
-  return AddrDelta;
-}
-
 void MCObjectStreamer::EmitDwarfAdvanceLineAddr(int64_t LineDelta,
                                                 const MCSymbol *LastLabel,
                                                 const MCSymbol *Label) {
diff --git a/lib/MC/MCStreamer.cpp b/lib/MC/MCStreamer.cpp
index b5cddcde6f..55ccf56288 100644
--- a/lib/MC/MCStreamer.cpp
+++ b/lib/MC/MCStreamer.cpp
@@ -28,6 +28,29 @@ MCStreamer::MCStreamer(MCContext &Ctx) : Context(Ctx) {
 MCStreamer::~MCStreamer() {
 }
 
+const MCExpr *MCStreamer::BuildSymbolDiff(MCContext &Context,
+                                          const MCSymbol *A,
+                                          const MCSymbol *B) {
+  MCSymbolRefExpr::VariantKind Variant = MCSymbolRefExpr::VK_None;
+  const MCExpr *ARef =
+    MCSymbolRefExpr::Create(A, Variant, Context);
+  const MCExpr *BRef =
+    MCSymbolRefExpr::Create(B, Variant, Context);
+  const MCExpr *AddrDelta =
+    MCBinaryExpr::Create(MCBinaryExpr::Sub, ARef, BRef, Context);
+  return AddrDelta;
+}
+
+const MCExpr *MCStreamer::ForceExpAbs(MCStreamer *Streamer,
+                                      MCContext &Context, const MCExpr* Expr) {
+ if (Context.getAsmInfo().hasAggressiveSymbolFolding())
+   return Expr;
+
+ MCSymbol *ABS = Context.CreateTempSymbol();
+ Streamer->EmitAssignment(ABS, Expr);
+ return MCSymbolRefExpr::Create(ABS, Context);
+}
+
 raw_ostream &MCStreamer::GetCommentOS() {
   // By default, discard comments.
   return nulls();