Sink DwarfUnit::SectionSym into DwarfCompileUnit as it's only needed/used there.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@221062 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/AsmPrinter/DwarfCompileUnit.h

@@ -36,6 +36,9 @@ class DwarfCompileUnit : public DwarfUnit {
   /// Skeleton unit associated with this unit.
   DwarfCompileUnit *Skeleton;
 
+  /// A label at the start of the non-dwo section related to this unit.
+  MCSymbol *SectionSym;
+
   /// \brief Construct a DIE for the given DbgVariable without initializing the
   /// DbgVariable's DIE reference.
   std::unique_ptr<DIE> constructVariableDIEImpl(const DbgVariable &DV,
@@ -156,6 +159,20 @@ public:
 
   /// Set the skeleton unit associated with this unit.
   void setSkeleton(DwarfCompileUnit &Skel) { Skeleton = &Skel; }
+
+  MCSymbol *getSectionSym() const {
+    assert(Section);
+    return SectionSym;
+  }
+
+  /// Pass in the SectionSym even though we could recreate it in every compile
+  /// unit (type units will have actually distinct symbols once they're in
+  /// comdat sections).
+  void initSection(const MCSection *Section, MCSymbol *SectionSym) {
+    DwarfUnit::initSection(Section);
+    this->SectionSym = SectionSym;
+  }
+
 };
 
 } // end llvm namespace

lib/CodeGen/AsmPrinter/DwarfDebug.cpp

@@ -2151,8 +2151,7 @@ void DwarfDebug::addDwarfTypeUnitType(DwarfCompileUnit &CU,
   NewTU.setTypeSignature(Signature);
 
   if (useSplitDwarf())
-    NewTU.initSection(Asm->getObjFileLowering().getDwarfTypesDWOSection(),
-                      DwarfTypesDWOSectionSym);
+    NewTU.initSection(Asm->getObjFileLowering().getDwarfTypesDWOSection());
   else {
     CU.applyStmtList(UnitDie);
     NewTU.initSection(

lib/CodeGen/AsmPrinter/DwarfUnit.cpp

@@ -1745,6 +1745,15 @@ void DwarfUnit::emitHeader(const MCSymbol *ASectionSym) const {
   Asm->EmitInt8(Asm->getDataLayout().getPointerSize());
 }
 
+void DwarfUnit::initSection(const MCSection *Section) {
+  assert(!this->Section);
+  this->Section = Section;
+  this->LabelBegin =
+      Asm->GetTempSymbol(Section->getLabelBeginName(), getUniqueID());
+  this->LabelEnd =
+      Asm->GetTempSymbol(Section->getLabelEndName(), getUniqueID());
+}
+
 void DwarfTypeUnit::emitHeader(const MCSymbol *ASectionSym) const {
   DwarfUnit::emitHeader(ASectionSym);
   Asm->OutStreamer.AddComment("Type Signature");
@@ -1755,16 +1764,3 @@ void DwarfTypeUnit::emitHeader(const MCSymbol *ASectionSym) const {
                                 sizeof(Ty->getOffset()));
 }
 
-void DwarfTypeUnit::initSection(const MCSection *Section) {
-  assert(!this->Section);
-  this->Section = Section;
-  // Since each type unit is contained in its own COMDAT section, the begin
-  // label and the section label are the same. Using the begin label emission in
-  // DwarfDebug to emit the section label as well is slightly subtle/sneaky, but
-  // the only other alternative of lazily constructing start-of-section labels
-  // and storing a mapping in DwarfDebug (or AsmPrinter).
-  this->SectionSym = this->LabelBegin =
-      Asm->GetTempSymbol(Section->getLabelBeginName(), getUniqueID());
-  this->LabelEnd =
-      Asm->GetTempSymbol(Section->getLabelEndName(), getUniqueID());
-}

lib/CodeGen/AsmPrinter/DwarfUnit.h

@@ -129,9 +129,6 @@ protected:
   /// The section this unit will be emitted in.
   const MCSection *Section;
 
-  /// A label at the start of the non-dwo section related to this unit.
-  MCSymbol *SectionSym;
-
   /// The start of the unit within its section.
   MCSymbol *LabelBegin;
 
@@ -141,32 +138,15 @@ protected:
   DwarfUnit(unsigned UID, dwarf::Tag, DICompileUnit CU, AsmPrinter *A,
             DwarfDebug *DW, DwarfFile *DWU);
 
+  void initSection(const MCSection *Section);
 public:
   virtual ~DwarfUnit();
 
-  /// Pass in the SectionSym even though we could recreate it in every compile
-  /// unit (type units will have actually distinct symbols once they're in
-  /// comdat sections).
-  void initSection(const MCSection *Section, MCSymbol *SectionSym) {
-    assert(!this->Section);
-    this->Section = Section;
-    this->SectionSym = SectionSym;
-    this->LabelBegin =
-        Asm->GetTempSymbol(Section->getLabelBeginName(), getUniqueID());
-    this->LabelEnd =
-        Asm->GetTempSymbol(Section->getLabelEndName(), getUniqueID());
-  }
-
   const MCSection *getSection() const {
     assert(Section);
     return Section;
   }
 
-  MCSymbol *getSectionSym() const {
-    assert(Section);
-    return SectionSym;
-  }
-
   MCSymbol *getLabelBegin() const {
     assert(Section);
     return LabelBegin;
@@ -503,10 +483,6 @@ public:
     return DwarfUnit::getHeaderSize() + sizeof(uint64_t) + // Type Signature
            sizeof(uint32_t);                               // Type DIE Offset
   }
-  void initSection(const MCSection *Section);
-  // Bring in the base function (taking two args, including the section symbol)
-  // for use when building DWO type units (they don't go in unique comdat
-  // sections)
   using DwarfUnit::initSection;
   DwarfCompileUnit &getCU() override { return CU; }