AsmPrinter: Use DwarfStringPoolEntry in DwarfAccelTable, NFC

This is just an API change, but it prepares to stop using
`EmitLabelDifference()` when possible.

llvm-svn: 238118

llvm/include/llvm/CodeGen/DwarfStringPoolEntry.h

@@ -38,6 +38,9 @@ public:
   unsigned getOffset() const { return I->second.Offset; }
   unsigned getIndex() const { return I->second.Index; }
   StringRef getString() const { return I->first(); }
+
+  bool operator==(const DwarfStringPoolEntryRef &X) const { return I == X.I; }
+  bool operator!=(const DwarfStringPoolEntryRef &X) const { return I != X.I; }
 };
 
 } // end namespace llvm

llvm/lib/CodeGen/AsmPrinter/DwarfAccelTable.cpp

@@ -30,14 +30,14 @@ DwarfAccelTable::DwarfAccelTable(ArrayRef<DwarfAccelTable::Atom> atomList)
     : Header(8 + (atomList.size() * 4)), HeaderData(atomList),
       Entries(Allocator) {}
 
-void DwarfAccelTable::AddName(StringRef Name, MCSymbol *StrSym, const DIE *die,
+void DwarfAccelTable::AddName(DwarfStringPoolEntryRef Name, const DIE *die,
                               char Flags) {
   assert(Data.empty() && "Already finalized!");
   // If the string is in the list already then add this die to the list
   // otherwise add a new one.
-  DataArray &DIEs = Entries[Name];
-  assert(!DIEs.StrSym || DIEs.StrSym == StrSym);
-  DIEs.StrSym = StrSym;
+  DataArray &DIEs = Entries[Name.getString()];
+  assert(!DIEs.Name || DIEs.Name == Name);
+  DIEs.Name = Name;
   DIEs.Values.push_back(new (Allocator) HashDataContents(die, Flags));
 }
 
@@ -216,7 +216,7 @@ void DwarfAccelTable::EmitData(AsmPrinter *Asm, DwarfDebug *D) {
       // Remember to emit the label for our offset.
       Asm->OutStreamer->EmitLabel((*HI)->Sym);
       Asm->OutStreamer->AddComment((*HI)->Str);
-      Asm->emitSectionOffset((*HI)->Data.StrSym);
+      Asm->emitSectionOffset((*HI)->Data.Name.getSymbol());
       Asm->OutStreamer->AddComment("Num DIEs");
       Asm->EmitInt32((*HI)->Data.Values.size());
       for (HashDataContents *HD : (*HI)->Data.Values) {

llvm/lib/CodeGen/AsmPrinter/DwarfAccelTable.h

@@ -181,9 +181,8 @@ public:
 private:
   // String Data
   struct DataArray {
-    MCSymbol *StrSym;
+    DwarfStringPoolEntryRef Name;
     std::vector<HashDataContents *> Values;
-    DataArray() : StrSym(nullptr) {}
   };
   friend struct HashData;
   struct HashData {
@@ -245,8 +244,7 @@ private:
   // Public Implementation
 public:
   DwarfAccelTable(ArrayRef<DwarfAccelTable::Atom>);
-  void AddName(StringRef Name, MCSymbol *StrSym, const DIE *Die,
-               char Flags = 0);
+  void AddName(DwarfStringPoolEntryRef Name, const DIE *Die, char Flags = 0);
   void FinalizeTable(AsmPrinter *, StringRef);
   void emit(AsmPrinter *, const MCSymbol *, DwarfDebug *);
 #ifndef NDEBUG

llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp

@@ -1977,27 +1977,23 @@ void DwarfDebug::addDwarfTypeUnitType(DwarfCompileUnit &CU,
 void DwarfDebug::addAccelName(StringRef Name, const DIE &Die) {
   if (!useDwarfAccelTables())
     return;
-  AccelNames.AddName(Name, InfoHolder.getStringPool().getSymbol(*Asm, Name),
-                     &Die);
+  AccelNames.AddName(InfoHolder.getStringPool().getEntry(*Asm, Name), &Die);
 }
 
 void DwarfDebug::addAccelObjC(StringRef Name, const DIE &Die) {
   if (!useDwarfAccelTables())
     return;
-  AccelObjC.AddName(Name, InfoHolder.getStringPool().getSymbol(*Asm, Name),
-                    &Die);
+  AccelObjC.AddName(InfoHolder.getStringPool().getEntry(*Asm, Name), &Die);
 }
 
 void DwarfDebug::addAccelNamespace(StringRef Name, const DIE &Die) {
   if (!useDwarfAccelTables())
     return;
-  AccelNamespace.AddName(Name, InfoHolder.getStringPool().getSymbol(*Asm, Name),
-                         &Die);
+  AccelNamespace.AddName(InfoHolder.getStringPool().getEntry(*Asm, Name), &Die);
 }
 
 void DwarfDebug::addAccelType(StringRef Name, const DIE &Die, char Flags) {
   if (!useDwarfAccelTables())
     return;
-  AccelTypes.AddName(Name, InfoHolder.getStringPool().getSymbol(*Asm, Name),
-                     &Die);
+  AccelTypes.AddName(InfoHolder.getStringPool().getEntry(*Asm, Name), &Die);
 }