[DebugInfo] Extract a helper function to return the DWARF format name, NFC [1/10]

Differential Revision: https://reviews.llvm.org/D80523

llvm/include/llvm/BinaryFormat/Dwarf.h

@@ -481,6 +481,7 @@ StringRef AtomTypeString(unsigned Atom);
 StringRef GDBIndexEntryKindString(GDBIndexEntryKind Kind);
 StringRef GDBIndexEntryLinkageString(GDBIndexEntryLinkage Linkage);
 StringRef IndexString(unsigned Idx);
+StringRef FormatString(DwarfFormat Format);
 /// @}
 
 /// \defgroup DwarfConstantsParsing Dwarf constants parsing functions

llvm/lib/BinaryFormat/Dwarf.cpp

@@ -770,6 +770,16 @@ bool llvm::dwarf::isValidFormForVersion(Form F, unsigned Version,
   return ExtensionsOk;
 }
 
+StringRef llvm::dwarf::FormatString(DwarfFormat Format) {
+  switch (Format) {
+  case DWARF32:
+    return "DWARF32";
+  case DWARF64:
+    return "DWARF64";
+  }
+  return StringRef();
+}
+
 constexpr char llvm::dwarf::EnumTraits<Attribute>::Type[];
 constexpr char llvm::dwarf::EnumTraits<Form>::Type[];
 constexpr char llvm::dwarf::EnumTraits<Index>::Type[];

llvm/lib/DebugInfo/DWARF/DWARFContext.cpp

@@ -190,7 +190,7 @@ static void dumpStringOffsetsSection(raw_ostream &OS, DIDumpOptions DumpOpts,
     // version field and the padding, a total of 4 bytes). Add them back in
     // for reporting.
     OS << "Contribution size = " << (Contribution->Size + (Version < 5 ? 0 : 4))
-       << ", Format = " << (Format == DWARF32 ? "DWARF32" : "DWARF64")
+       << ", Format = " << dwarf::FormatString(Format)
        << ", Version = " << Version << "\n";
 
     Offset = Contribution->Base;