[llvm][DebugNames] Implement supportsIdxParent query

Author: felipepiovezan

llvm/include/llvm/DebugInfo/DWARF/DWARFAcceleratorTable.h

@@ -557,6 +557,7 @@ class DWARFDebugNames : public DWARFAcceleratorTable {
     uint64_t StringOffsetsBase;
     uint64_t EntryOffsetsBase;
     uint64_t EntriesBase;
+    bool HasIdxParent = false;
 
     void dumpCUs(ScopedPrinter &W) const;
     void dumpLocalTUs(ScopedPrinter &W) const;
@@ -770,6 +771,13 @@ class DWARFDebugNames : public DWARFAcceleratorTable {
   /// Return the Name Index covering the compile unit at CUOffset, or nullptr if
   /// there is no Name Index covering that unit.
   const NameIndex *getCUNameIndex(uint64_t CUOffset);
+
+  /// Returns true if all the NameIndices in this table provide IDX_parent
+  /// capabilities.
+  bool supportsIdxParent() const {
+    return all_of(NameIndices,
+                  [](const NameIndex &Idx) { return Idx.HasIdxParent; });
+  }
 };
 
 /// If `Name` is the name of a templated function that includes template

llvm/lib/DebugInfo/DWARF/DWARFAcceleratorTable.cpp

@@ -578,13 +578,18 @@ Error DWARFDebugNames::NameIndex::extract() {
                              "Section too small: cannot read abbreviations.");
 
   EntriesBase = Offset + Hdr.AbbrevTableSize;
+  HasIdxParent = false;
+  auto IsIdxParent = [](auto IdxFormPair) {
+    return IdxFormPair.Index == dwarf::Index::DW_IDX_parent;
+  };
 
   for (;;) {
     auto AbbrevOr = extractAbbrev(&Offset);
     if (!AbbrevOr)
       return AbbrevOr.takeError();
     if (isSentinel(*AbbrevOr))
       return Error::success();
+    HasIdxParent |= any_of(AbbrevOr->Attributes, IsIdxParent);
 
     if (!Abbrevs.insert(std::move(*AbbrevOr)).second)
       return createStringError(errc::invalid_argument,