[llvm] [BOLT][DWARF][NFC] Refactor address writers (PR #98094)

[Alexander Yermolovich via llvm-commits]

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@@ -344,14 +344,40 @@ class DebugAddrWriter {
   uint32_t getIndexFromAddress(uint64_t Address, DWARFUnit &CU);
 
   /// Write out entries in to .debug_addr section for CUs.
-  virtual void update(DIEBuilder &DIEBlder, DWARFUnit &CUs);
+  virtual std::optional<uint64_t> finalize(const size_t BufferSize);
 
   /// Return buffer with all the entries in .debug_addr already writen out using
   /// update(...).
-  virtual AddressSectionBuffer &finalize() { return *Buffer; }
+  virtual std::unique_ptr<AddressSectionBuffer> releaseBuffer() {
+    return std::move(Buffer);
+  }
+
+  /// Returns buffer size.
+  virtual size_t getBufferSize() { return Buffer->size(); }
 
   /// Returns False if .debug_addr section was created..
-  bool isInitialized() const { return !AddressMaps.empty(); }
+  bool isInitialized() { return Buffer->size() > 0; }
+
+  /// Updates address base with the given Offset.
+  virtual void updateAddrBase(DIEBuilder &DIEBlder, DWARFUnit &CU,
+                              const uint64_t Offset);
+
+  /// Appends an AddressSectionBuffer to the address writer buffer for the given
+  /// CU.
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ayermolo wrote:

Update a comment. Not sure CU part applies anymore.

https://github.com/llvm/llvm-project/pull/98094