[Lldb-commits] [lldb] [lldb][DWARFIndex] Use IDX_parent to implement GetFullyQualifiedType query (PR #79932)

[Adrian Prantl via lldb-commits]

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@@ -218,6 +219,104 @@ void DebugNamesDWARFIndex::GetCompleteObjCClass(
   m_fallback.GetCompleteObjCClass(class_name, must_be_implementation, callback);
 }
 
+namespace {
+using Entry = llvm::DWARFDebugNames::Entry;
+
+/// If `entry` and all of its parents have an `IDX_parent`, use that information
+/// to build and return a list of at most `max_parents` parent Entries.
+/// `entry` itself is not included in the list.
+/// If any parent does not have an `IDX_parent`, or the Entry data is corrupted,
+/// nullopt is returned.
+static std::optional<llvm::SmallVector<Entry, 4>>
+getParentChain(Entry entry, uint32_t max_parents) {
+  llvm::SmallVector<Entry, 4> parent_entries;
+
+  do {
+    if (!entry.hasParentInformation())
+      return std::nullopt;
+
+    llvm::Expected<std::optional<Entry>> parent = entry.getParentDIEEntry();
+    if (!parent) { // Bad data.
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adrian-prantl wrote:

comment should be on its own line.

https://github.com/llvm/llvm-project/pull/79932