================
@@ -208,21 +266,103 @@ SymbolTags computeSymbolTags(const NamedDecl &ND) {
   return Result;
 }
 
+// Filter symbol tags based on the presence of other tags and the kind of
+// symbol. This is needed to avoid redundant tags.
+SymbolTags filterSymbolTags(const NamedDecl &ND, const SymbolTags ST) {
+  SymbolTags Result = ST;
+
+  if (not isa<CXXMethodDecl>(ND))
+    return Result;
+
+  if (ST & toSymbolTagBitmask(SymbolTag::Overrides)) {
+    // Overrides means that ND overrides an existing implementation of a 
virtual
+    // method in a base class. If a symbol is marked as Overrides, the tags
+    // Virtual, Declaration and Definition should be removed, as the Overrides
+    // tag implies that the symbol has/is virtual/declaration/definition.
+    Result &= ~toSymbolTagBitmask(SymbolTag::Virtual);
+    Result &= ~toSymbolTagBitmask(SymbolTag::Declaration);
+    Result &= ~toSymbolTagBitmask(SymbolTag::Definition);
+  }
+  if (ST & toSymbolTagBitmask(SymbolTag::Implements)) {
+    // Implements means that ND implements an existing pure virtual method in a
+    // base class. If a symbol is marked as Implements, the tags Virtual,
+    // Declaration, Definition and Overrides should be removed, as the
+    // Implements tag implies that the symbol is virtual, is a declaration, is 
a
+    // definition, and overrides a method.
+    Result &= ~toSymbolTagBitmask(SymbolTag::Virtual);
+    Result &= ~toSymbolTagBitmask(SymbolTag::Declaration);
+    Result &= ~toSymbolTagBitmask(SymbolTag::Definition);
+    Result &= ~toSymbolTagBitmask(SymbolTag::Overrides);
+  }
+  if (ST & toSymbolTagBitmask(SymbolTag::Virtual)) {
+    // Virtual means that ND is a virtual method that does not override any
+    // method in a base class. If a symbol is marked as Virtual, the tags
+    // Declaration and Definition should be removed, as the Virtual tag implies
+    // that the symbol is a declaration/definition.
+    Result &= ~toSymbolTagBitmask(SymbolTag::Declaration);
+    Result &= ~toSymbolTagBitmask(SymbolTag::Definition);
+  }
+  if (ST & toSymbolTagBitmask(SymbolTag::Abstract)) {
+    // Abstract means that ND is a pure virtual method. If a symbol is marked 
as
+    // Abstract, the tags Virtual, Declaration and Definition should be 
removed,
+    // as the Abstract tag implies that the symbol is virtual and a
+    // declaration/definition.
+    Result &= ~toSymbolTagBitmask(SymbolTag::Virtual);
+    Result &= ~toSymbolTagBitmask(SymbolTag::Declaration);
+    Result &= ~toSymbolTagBitmask(SymbolTag::Definition);
+  }
+  if (ST & toSymbolTagBitmask(SymbolTag::Final)) {
+    // Final means that ND is a method that cannot be overridden by any method
+    // in a derived class. If a symbol is marked as Final, the tags Virtual and
+    // Overrides should be removed, as the Final tag implies that the symbol is
+    // virtual.
+    Result &= ~toSymbolTagBitmask(SymbolTag::Virtual);
+    Result &= ~toSymbolTagBitmask(SymbolTag::Overrides);
+  }
+  return Result;
+}
+
+std::vector<SymbolTag> expandTagBitmask(const SymbolTags symbolTags) {
+  std::vector<SymbolTag> Tags;
+
+  if (symbolTags == 0)
+    return Tags;
+
+  // No filtering required since this function is only used for Symbols from 
the
+  // index, which have already been filtered in getSymbolTags(const NamedDecl
+  // &ND).
+
----------------
ratzdi wrote:

done.

https://github.com/llvm/llvm-project/pull/170103
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