================
@@ -85,6 +86,31 @@ class DebugNamesDWARFIndex : public DWARFIndex {
DWARFUnit *GetNonSkeletonUnit(const DebugNames::Entry &entry) const;
DWARFDIE GetDIE(const DebugNames::Entry &entry) const;
+
+ /// Checks if an entry is a foreign TU and fetch the type unit.
+ ///
+ /// This function checks if the DebugNames::Entry refers to a foreign TU and
+ /// returns an optional with a value of the \a entry is a foreign type unit
+ /// entry. A valid pointer will be returned if this entry is from a .dwo file
+ /// or if it is from a .dwp file and it matches the type unit's originating
+ /// .dwo file by verifying that the DW_TAG_type_unit DIE has a DW_AT_dwo_name
+ /// that matches the DWO name from the originating skeleton compile unit.
+ ///
+ /// \param[in] entry
+ /// The accelerator table entry to check.
+ ///
+ /// \returns
+ /// A std::optional that has a value if this entry represents a foreign
type
+ /// unit. If the pointer is valid, then we were able to find and match the
+ /// entry to the type unit in the .dwo or .dwp file. The returned value can
+ /// have a valid, yet contain NULL in the following cases:
+ /// - we were not able to load the .dwo file (missing or DWO ID mismatch)
+ /// - we were able to load the .dwp file, but the type units DWO name
+ /// doesn't match the originating skeleton compile unit's entry
+ /// Returns std::nullopt if this entry is not a foreign type unit entry.
+ std::optional<DWARFTypeUnit *>
+ IsForeignTypeUnit(const DebugNames::Entry &entry) const;
----------------
labath wrote:
Nit: I would expect a function called `IsSomething` to return `bool`. Maybe
just call it `GetForeignTypeUnit` ?
https://github.com/llvm/llvm-project/pull/87740
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