Fixed verson of r120245.

Factor some duplicated code into MCObjectStreamer::EmitLabel.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120248 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/MC/MCObjectStreamer.h

@@ -60,6 +60,7 @@ public:
   /// @name MCStreamer Interface
   /// @{
 
+  virtual void EmitLabel(MCSymbol *Symbol);
   virtual void EmitULEB128Value(const MCExpr *Value, unsigned AddrSpace = 0);
   virtual void EmitSLEB128Value(const MCExpr *Value, unsigned AddrSpace = 0);
   virtual void EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol);

lib/MC/MCELFStreamer.cpp

@@ -191,24 +191,13 @@ void MCELFStreamer::InitSections() {
 void MCELFStreamer::EmitLabel(MCSymbol *Symbol) {
   assert(Symbol->isUndefined() && "Cannot define a symbol twice!");
 
-  Symbol->setSection(*CurSection);
+  MCObjectStreamer::EmitLabel(Symbol);
-
-  MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*Symbol);
 
   const MCSectionELF &Section =
     static_cast<const MCSectionELF&>(Symbol->getSection());
+  MCSymbolData &SD = getAssembler().getSymbolData(*Symbol);
   if (Section.getFlags() & MCSectionELF::SHF_TLS)
     SetType(SD, ELF::STT_TLS);
-
-  // FIXME: This is wasteful, we don't necessarily need to create a data
-  // fragment. Instead, we should mark the symbol as pointing into the data
-  // fragment if it exists, otherwise we should just queue the label and set its
-  // fragment pointer when we emit the next fragment.
-  MCDataFragment *F = getOrCreateDataFragment();
-
-  assert(!SD.getFragment() && "Unexpected fragment on symbol data!");
-  SD.setFragment(F);
-  SD.setOffset(F->getContents().size());
 }
 
 void MCELFStreamer::EmitAssemblerFlag(MCAssemblerFlag Flag) {

lib/MC/MCMachOStreamer.cpp

@@ -105,30 +105,18 @@ void MCMachOStreamer::InitSections() {
 }
 
 void MCMachOStreamer::EmitLabel(MCSymbol *Symbol) {
-  // TODO: This is almost exactly the same as WinCOFFStreamer. Consider merging
-  // into MCObjectStreamer.
   assert(Symbol->isUndefined() && "Cannot define a symbol twice!");
-  assert(!Symbol->isVariable() && "Cannot emit a variable symbol!");
-  assert(CurSection && "Cannot emit before setting section!");
 
+  // isSymbolLinkerVisible uses the section.
   Symbol->setSection(*CurSection);
-
-  MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*Symbol);
-
   // We have to create a new fragment if this is an atom defining symbol,
   // fragments cannot span atoms.
-  if (getAssembler().isSymbolLinkerVisible(SD.getSymbol()))
+  if (getAssembler().isSymbolLinkerVisible(*Symbol))
     new MCDataFragment(getCurrentSectionData());
 
-  // FIXME: This is wasteful, we don't necessarily need to create a data
+  MCObjectStreamer::EmitLabel(Symbol);
-  // fragment. Instead, we should mark the symbol as pointing into the data
-  // fragment if it exists, otherwise we should just queue the label and set its
-  // fragment pointer when we emit the next fragment.
-  MCDataFragment *F = getOrCreateDataFragment();
-  assert(!SD.getFragment() && "Unexpected fragment on symbol data!");
-  SD.setFragment(F);
-  SD.setOffset(F->getContents().size());
 
+  MCSymbolData &SD = getAssembler().getSymbolData(*Symbol);
   // This causes the reference type flag to be cleared. Darwin 'as' was "trying"
   // to clear the weak reference and weak definition bits too, but the
   // implementation was buggy. For now we just try to match 'as', for

lib/MC/MCObjectStreamer.cpp

@@ -14,6 +14,7 @@
 #include "llvm/MC/MCCodeEmitter.h"
 #include "llvm/MC/MCDwarf.h"
 #include "llvm/MC/MCExpr.h"
+#include "llvm/MC/MCSymbol.h"
 #include "llvm/Target/TargetAsmBackend.h"
 using namespace llvm;
 
@@ -75,6 +76,24 @@ const MCExpr *MCObjectStreamer::AddValueSymbols(const MCExpr *Value) {
   return Value;
 }
 
+void MCObjectStreamer::EmitLabel(MCSymbol *Symbol) {
+  assert(!Symbol->isVariable() && "Cannot emit a variable symbol!");
+  assert(CurSection && "Cannot emit before setting section!");
+
+  Symbol->setSection(*CurSection);
+
+  MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*Symbol);
+
+  // FIXME: This is wasteful, we don't necessarily need to create a data
+  // fragment. Instead, we should mark the symbol as pointing into the data
+  // fragment if it exists, otherwise we should just queue the label and set its
+  // fragment pointer when we emit the next fragment.
+  MCDataFragment *F = getOrCreateDataFragment();
+  assert(!SD.getFragment() && "Unexpected fragment on symbol data!");
+  SD.setFragment(F);
+  SD.setOffset(F->getContents().size());
+}
+
 void MCObjectStreamer::EmitULEB128Value(const MCExpr *Value,
                                         unsigned AddrSpace) {
   new MCLEBFragment(*Value, false, getCurrentSectionData());

lib/MC/WinCOFFStreamer.cpp

@@ -176,25 +176,8 @@ void WinCOFFStreamer::InitSections() {
 }
 
 void WinCOFFStreamer::EmitLabel(MCSymbol *Symbol) {
-  // TODO: This is copied almost exactly from the MachOStreamer. Consider
-  // merging into MCObjectStreamer?
   assert(Symbol->isUndefined() && "Cannot define a symbol twice!");
-  assert(!Symbol->isVariable() && "Cannot emit a variable symbol!");
+  MCObjectStreamer::EmitLabel(Symbol);
-  assert(CurSection && "Cannot emit before setting section!");
-
-  Symbol->setSection(*CurSection);
-
-  MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*Symbol);
-
-  // FIXME: This is wasteful, we don't necessarily need to create a data
-  // fragment. Instead, we should mark the symbol as pointing into the data
-  // fragment if it exists, otherwise we should just queue the label and set its
-  // fragment pointer when we emit the next fragment.
-  MCDataFragment *DF = getOrCreateDataFragment();
-
-  assert(!SD.getFragment() && "Unexpected fragment on symbol data!");
-  SD.setFragment(DF);
-  SD.setOffset(DF->getContents().size());
 }
 
 void WinCOFFStreamer::EmitAssemblerFlag(MCAssemblerFlag Flag) {