Subzero: Add basic ELFObjectWriter (text section, symtab, strtab, headers)

src/IceTranslator.h

 //===- subzero/src/IceTranslator.h - ICE to machine code --------*- C++ -*-===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This file declares the general driver class for translating ICE to
@@ skipping 42 matching lines @@
   /// set to Fcn.
   void translateFcn(Cfg *Fcn);
 
   /// Emits the constant pool.
   void emitConstants();
 
   /// Lowers the given list of global addresses to target. Generates
   /// list of corresponding variable declarations.
   void lowerGlobals(const VariableDeclarationListType &VariableDeclarations);
 
+  /// Write the final object file after completing translation.
+  void writeObjectFile();
+
   /// Creates a name using the given prefix and corresponding index.
   std::string createUnnamedName(const IceString &Prefix, SizeT Index);
 
   /// Reports if there is a (potential) conflict between Name, and using
   /// Prefix to name unnamed names. Errors are put on Ostream.
   /// Returns true if there isn't a potential conflict.
   bool checkIfUnnamedNameSafe(const IceString &Name, const char *Kind,
                               const IceString &Prefix, Ostream &Stream);
 
 protected:
   GlobalContext *Ctx;
   const ClFlags &Flags;
   // The exit status of the translation. False is successful. True
   // otherwise.
   bool ErrorStatus;
   // Ideally, Func would be inside the methods that converts IR to
   // functions.  However, emitting the constant pool requires a valid
   // Cfg object, so we need to defer deleting the last non-empty Cfg
   // object to emit the constant pool (via emitConstants). TODO:
   // Since all constants are globally pooled in the GlobalContext
   // object, change all Constant related functions to use
   // GlobalContext instead of Cfg, and then make emitConstantPool use
   // that.
   std::unique_ptr<Cfg> Func;
 };
 
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICETRANSLATOR_H