1/2: [nfc] [lldb] Reduce GetAttributes's depth parameter usage

[jankratochvil]

Summary

There is Labath's comment which is more tricky than it looks. So first cleanup the code a bit.

[labath]

lldb/source/Plugins/SymbolFile/DWARF/DWARFDebugInfoEntry.cpp

733

I guess this could keep calling the public version of this function without the extra argument.

783

and this too(?)

lldb/source/Plugins/SymbolFile/DWARF/DWARFDebugInfoEntry.h

182

That comment is probably not useful anymore.

[jankratochvil]

lldb/source/Plugins/SymbolFile/DWARF/DWARFDebugInfoEntry.cpp

733

It was intentional but in fact you are right.

lldb/source/Plugins/SymbolFile/DWARF/DWARFBaseDIE.h

const char *GetAttributeValueAsString(const dw_attr_t attr,
                                         const char *fail_value) const;
 
   uint64_t GetAttributeValueAsUnsigned(const dw_attr_t attr,
                                        uint64_t fail_value) const;
 
   uint64_t GetAttributeValueAsAddress(const dw_attr_t attr,
                                       uint64_t fail_value) const;
 
-  size_t GetAttributes(DWARFAttributes &attributes, uint32_t depth = 0) const;
+  size_t GetAttributes(DWARFAttributes &attributes) const;
 
 protected:
   DWARFUnit *m_cu;
   DWARFDebugInfoEntry *m_die;
 };
 
 bool operator==(const DWARFBaseDIE &lhs, const DWARFBaseDIE &rhs);
 bool operator!=(const DWARFBaseDIE &lhs, const DWARFBaseDIE &rhs);
 
 #endif // LLDB_SOURCE_PLUGINS_SYMBOLFILE_DWARF_DWARFBASEDIE_H

lldb/source/Plugins/SymbolFile/DWARF/DWARFBaseDIE.cpp

 bool DWARFBaseDIE::HasChildren() const {
   return m_die && m_die->HasChildren();
 }
 
 bool DWARFBaseDIE::Supports_DW_AT_APPLE_objc_complete_type() const {
   return IsValid() && GetDWARF()->Supports_DW_AT_APPLE_objc_complete_type(m_cu);
 }
 
-size_t DWARFBaseDIE::GetAttributes(DWARFAttributes &attributes,
-                               uint32_t depth) const {
+size_t DWARFBaseDIE::GetAttributes(DWARFAttributes &attributes) const {
   if (IsValid())
-    return m_die->GetAttributes(m_cu, attributes, depth);
-  if (depth == 0)
-    attributes.Clear();
+    return m_die->GetAttributes(m_cu, attributes);
   return 0;
 }
 
 bool operator==(const DWARFBaseDIE &lhs, const DWARFBaseDIE &rhs) {
   return lhs.GetDIE() == rhs.GetDIE() && lhs.GetCU() == rhs.GetCU();
 }
 
 bool operator!=(const DWARFBaseDIE &lhs, const DWARFBaseDIE &rhs) {
   return !(lhs == rhs);
 }
 
 const DWARFDataExtractor &DWARFBaseDIE::GetData() const {
   // Clients must check if this DIE is valid before calling this function.
   assert(IsValid());
   return m_cu->GetData();
 }

lldb/source/Plugins/SymbolFile/DWARF/DWARFDebugInfoEntry.h

public:
   bool operator!=(const DWARFDebugInfoEntry &rhs) const;
 
   void BuildFunctionAddressRangeTable(const DWARFUnit *cu,
                                       DWARFDebugAranges *debug_aranges) const;
 
   bool Extract(const lldb_private::DWARFDataExtractor &data,
                const DWARFUnit *cu, lldb::offset_t *offset_ptr);
 
-  size_t GetAttributes(const DWARFUnit *cu,
-                       DWARFAttributes &attrs,
-                       uint32_t curr_depth = 0)
-      const; // "curr_depth" for internal use only, don't set this yourself!!!
+  size_t GetAttributes(const DWARFUnit *cu, DWARFAttributes &attrs) const {
+    return GetAttributes(cu, attrs, 0 /* curr_depth */);
+  }
 
   dw_offset_t
   GetAttributeValue(const DWARFUnit *cu, const dw_attr_t attr,
                     DWARFFormValue &formValue,
                     dw_offset_t *end_attr_offset_ptr = nullptr,
                     bool check_specification_or_abstract_origin = false) const;
 
   const char *GetAttributeValueAsString(
uint32_t m_sibling_idx : 31, // How many to add to "this" to get the sibling.
       // If it is zero, then the DIE doesn't have children, or the
       // DWARF claimed it had children but the DIE only contained
       // a single NULL terminating child.
       m_has_children : 1;
   uint16_t m_abbr_idx;
   /// A copy of the DW_TAG value so we don't have to go through the compile
   /// unit abbrev table
   dw_tag_t m_tag = llvm::dwarf::DW_TAG_null;
+
+private:
+  size_t GetAttributes(const DWARFUnit *cu, DWARFAttributes &attrs,
+                       uint32_t curr_depth) const;
 };
 
 #endif // LLDB_SOURCE_PLUGINS_SYMBOLFILE_DWARF_DWARFDEBUGINFOENTRY_H

lldb/source/Plugins/SymbolFile/DWARF/DWARFDebugInfoEntry.cpp

for (uint32_t i = 0; i < num_attributes; ++i) {
         attributes.Append(cu, offset, attr, form);
         break;
       }
 
       if ((attr == DW_AT_specification) || (attr == DW_AT_abstract_origin)) {
         if (form_value.ExtractValue(data, &offset)) {
           DWARFDIE spec_die = form_value.Reference();
           if (spec_die)
-            spec_die.GetAttributes(attributes, curr_depth + 1);
+            spec_die.GetDIE()->GetAttributes(spec_die.GetCU(), attributes,
+                                             curr_depth + 1);
         }
       } else {
         llvm::Optional<uint8_t> fixed_skip_size = DWARFFormValue::GetFixedSize(form, cu);
         if (fixed_skip_size)
           offset += *fixed_skip_size;
         else
           DWARFFormValue::SkipValue(form, data, &offset, cu);
       }

 
 DWARFDeclContext DWARFDebugInfoEntry::GetDWARFDeclContext(DWARFUnit *cu) const {
   return GetDWARFDeclContextStatic(this, cu);
 }
 
 DWARFDIE
 DWARFDebugInfoEntry::GetParentDeclContextDIE(DWARFUnit *cu) const {
   DWARFAttributes attributes;
   GetAttributes(cu, attributes);
   return GetParentDeclContextDIE(cu, attributes);
 }
 
 DWARFDIE
 DWARFDebugInfoEntry::GetParentDeclContextDIE(
     DWARFUnit *cu, const DWARFAttributes &attributes) const {
   DWARFDIE die(cu, const_cast<DWARFDebugInfoEntry *>(this));
 
while (die) {
     die = die.GetParent();
   }
   return DWARFDIE();
 }
 
 const char *DWARFDebugInfoEntry::GetQualifiedName(DWARFUnit *cu,
                                                   std::string &storage) const {
   DWARFAttributes attributes;
   GetAttributes(cu, attributes);
   return GetQualifiedName(cu, attributes, storage);
 }
 
 const char *
 DWARFDebugInfoEntry::GetQualifiedName(DWARFUnit *cu,
                                       const DWARFAttributes &attributes,
                                       std::string &storage) const {