reapply r98035:

Now that setStartLabel takes an MCSymbol, we can de-ID'ize
beginScope and RecordSourceLine.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@98047 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/CodeGen/DwarfWriter.h

@@ -35,6 +35,7 @@ class Value;
 class Module;
 class MDNode;
 class MCAsmInfo;
+class MCSymbol;
 class raw_ostream;
 class Instruction;
 class DICompileUnit;
@@ -82,10 +83,10 @@ public:
   ///
   void EndFunction(const MachineFunction *MF);
 
-  /// RecordSourceLine - Register a source line with debug info. Returns a
+  /// RecordSourceLine - Register a source line with debug info. Returns the
-  /// unique label ID used to generate a label and provide correspondence to
+  /// unique label that was emitted and which provides correspondence to
   /// the source line list.
-  unsigned RecordSourceLine(unsigned Line, unsigned Col, MDNode *Scope);
+  MCSymbol *RecordSourceLine(unsigned Line, unsigned Col, MDNode *Scope);
 
   /// getRecordSourceLineCount - Count source lines.
   unsigned getRecordSourceLineCount();
@@ -94,7 +95,7 @@ public:
   /// be emitted.
   bool ShouldEmitDwarfDebug() const;
 
-  void BeginScope(const MachineInstr *MI, unsigned Label);
+  void BeginScope(const MachineInstr *MI, MCSymbol *Label);
   void EndScope(const MachineInstr *MI);
 };
 

lib/CodeGen/AsmPrinter/AsmPrinter.cpp

@@ -1319,10 +1319,9 @@ void AsmPrinter::processDebugLoc(const MachineInstr *MI,
     // After printing instruction
     DW->EndScope(MI);
   } else if (CurDLT.getNode() != PrevDLT) {
-    unsigned L = DW->RecordSourceLine(CurDLT.getLineNumber(), 
+    MCSymbol *L = DW->RecordSourceLine(CurDLT.getLineNumber(), 
                                        CurDLT.getColumnNumber(),
                                        CurDLT.getScope().getNode());
-    printLabel(L);
     DW->BeginScope(MI, L);
     PrevDLT = CurDLT.getNode();
   }

lib/CodeGen/AsmPrinter/DwarfDebug.cpp

@@ -1951,14 +1951,14 @@ void DwarfDebug::collectVariableInfo() {
 }
 
 /// beginScope - Process beginning of a scope starting at Label.
-void DwarfDebug::beginScope(const MachineInstr *MI, unsigned Label) {
+void DwarfDebug::beginScope(const MachineInstr *MI, MCSymbol *Label) {
   InsnToDbgScopeMapTy::iterator I = DbgScopeBeginMap.find(MI);
   if (I == DbgScopeBeginMap.end())
     return;
   ScopeVector &SD = I->second;
   for (ScopeVector::iterator SDI = SD.begin(), SDE = SD.end();
        SDI != SDE; ++SDI)
-    (*SDI)->setStartLabel(getDWLabel("label", Label));
+    (*SDI)->setStartLabel(Label);
 }
 
 /// endScope - Process end of a scope.
@@ -2127,7 +2127,7 @@ void DwarfDebug::beginFunction(const MachineFunction *MF) {
       Col = DLT.getColumnNumber();
     }
     
-    Asm->printLabel(recordSourceLine(Line, Col, DLT.getScope().getNode()));
+    recordSourceLine(Line, Col, DLT.getScope().getNode());
   }
   if (TimePassesIsEnabled)
     DebugTimer->stopTimer();
@@ -2183,11 +2183,10 @@ void DwarfDebug::endFunction(const MachineFunction *MF) {
     DebugTimer->stopTimer();
 }
 
-/// recordSourceLine - Records location information and associates it with a
+/// recordSourceLine - Register a source line with debug info. Returns the
-/// label. Returns a unique label ID used to generate a label and provide
+/// unique label that was emitted and which provides correspondence to
-/// correspondence to the source line list.
+/// the source line list.
-unsigned DwarfDebug::recordSourceLine(unsigned Line, unsigned Col,
+MCSymbol *DwarfDebug::recordSourceLine(unsigned Line, unsigned Col, MDNode *S) {
-                                      MDNode *S) {
   if (!MMI)
     return 0;
 
@@ -2220,7 +2219,9 @@ unsigned DwarfDebug::recordSourceLine(unsigned Line, unsigned Col,
   if (TimePassesIsEnabled)
     DebugTimer->stopTimer();
 
-  return ID;
+  MCSymbol *Label = getDWLabel("label", ID);
+  Asm->OutStreamer.EmitLabel(Label);
+  return Label;
 }
 
 /// getOrCreateSourceID - Public version of GetOrCreateSourceID. This can be

lib/CodeGen/AsmPrinter/DwarfDebug.h

@@ -512,10 +512,10 @@ public:
   ///
   void endFunction(const MachineFunction *MF);
 
-  /// recordSourceLine - Records location information and associates it with a 
+  /// recordSourceLine - Register a source line with debug info. Returns the
-  /// label. Returns a unique label ID used to generate a label and provide
+  /// unique label that was emitted and which provides correspondence to
-  /// correspondence to the source line list.
+  /// the source line list.
-  unsigned recordSourceLine(unsigned Line, unsigned Col, MDNode *Scope);
+  MCSymbol *recordSourceLine(unsigned Line, unsigned Col, MDNode *Scope);
 
   /// getSourceLineCount - Return the number of source lines in the debug
   /// info.
@@ -539,7 +539,7 @@ public:
   void collectVariableInfo();
 
   /// beginScope - Process beginning of a scope starting at Label.
-  void beginScope(const MachineInstr *MI, unsigned Label);
+  void beginScope(const MachineInstr *MI, MCSymbol *Label);
 
   /// endScope - Prcess end of a scope.
   void endScope(const MachineInstr *MI);

lib/CodeGen/AsmPrinter/DwarfWriter.cpp

@@ -73,10 +73,10 @@ void DwarfWriter::EndFunction(const MachineFunction *MF) {
     MMI->EndFunction();
 }
 
-/// RecordSourceLine - Records location information and associates it with a 
+/// RecordSourceLine - Register a source line with debug info. Returns the
-/// label. Returns a unique label ID used to generate a label and provide
+/// unique label that was emitted and which provides correspondence to
-/// correspondence to the source line list.
+/// the source line list.
-unsigned DwarfWriter::RecordSourceLine(unsigned Line, unsigned Col, 
+MCSymbol *DwarfWriter::RecordSourceLine(unsigned Line, unsigned Col, 
                                         MDNode *Scope) {
   return DD->recordSourceLine(Line, Col, Scope);
 }
@@ -92,7 +92,7 @@ bool DwarfWriter::ShouldEmitDwarfDebug() const {
   return DD && DD->ShouldEmitDwarfDebug();
 }
 
-void DwarfWriter::BeginScope(const MachineInstr *MI, unsigned L) {
+void DwarfWriter::BeginScope(const MachineInstr *MI, MCSymbol *L) {
   DD->beginScope(MI, L);
 }
 void DwarfWriter::EndScope(const MachineInstr *MI) {