Subzero. Uses fixups to calculate addend to relocations.

src/IceFixups.h

 //===- subzero/src/IceFixups.h - Assembler fixup kinds ----------*- C++ -*-===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file
@@ skipping 36 matching lines @@
   IceString symbol(const GlobalContext *Ctx, const Assembler *Asm) const;
 
   static const Constant *NullSymbol;
   bool isNullSymbol() const { return value_ == NullSymbol; }
 
   static constexpr AssemblerFixup *NoFixup = nullptr;
 
   void set_value(const Constant *Value) { value_ = Value; }
 
   void set_addend(RelocOffsetT Addend) { addend_ = Addend; }
+  RelocOffsetT get_addend() const { return addend_; }
 
   /// Emits fixup, then returns the number of bytes to skip.
   virtual size_t emit(GlobalContext *Ctx, const Assembler &Asm) const;
 
+  /// Emits offset() (little endian) in position_. If your fixup requires
+  /// something smarter, you must create your own fixup type.
+  virtual void emitOffset(Assembler *Asm) const;
+
 private:
   bool position_was_set_ = false;
   intptr_t position_ = 0;
   FixupKind kind_ = 0;
   const Constant *value_ = nullptr;
   // An offset addend to the fixup offset (as returned by offset()), in case the
   // assembler needs to adjust it.
   RelocOffsetT addend_ = 0;
 };
 
@@ skipping 15 matching lines @@
   const std::string Message;
   const size_t NumBytes;
 };
 
 using FixupList = std::vector<AssemblerFixup>;
 using FixupRefList = std::vector<AssemblerFixup *>;
 
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICEFIXUPS_H