Subzero: Initial implementation of multithreaded translation.

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
 // machine code.
 //
 //===----------------------------------------------------------------------===//
 
 #ifndef SUBZERO_SRC_ICETRANSLATOR_H
 #define SUBZERO_SRC_ICETRANSLATOR_H
 
-#include <memory>
-
 namespace llvm {
 class Module;
 }
 
 namespace Ice {
 
 class ClFlags;
 class Cfg;
 class VariableDeclaration;
 class GlobalContext;
 
 // Base class for translating ICE to machine code.  Derived classes convert
 // other intermediate representations down to ICE, and then call the appropriate
 // (inherited) methods to convert ICE into machine instructions.
 class Translator {
   Translator(const Translator &) = delete;
   Translator &operator=(const Translator &) = delete;
 
 public:
   typedef std::vector<VariableDeclaration *> VariableDeclarationListType;
 
-  Translator(GlobalContext *Ctx, const ClFlags &Flags)
-      : Ctx(Ctx), Flags(Flags), ErrorStatus(0) {}
-
+  Translator(GlobalContext *Ctx, const ClFlags &Flags);
   ~Translator();
-  bool getErrorStatus() const { return ErrorStatus; }
+  const ErrorCode &getErrorStatus() const { return ErrorStatus; }
 
   GlobalContext *getContext() const { return Ctx; }
 
   const ClFlags &getFlags() const { return Flags; }
 
   /// Translates the constructed ICE function Fcn to machine code.
-  /// Takes ownership of Fcn. Note: As a side effect, Field Func is
-  /// set to Fcn.
-  void translateFcn(Cfg *Fcn);
+  /// Takes ownership of Func.
+  void translateFcn(Cfg *Func);
 
   /// Emits the constant pool.
   void emitConstants();
 
+  /// If there was an error during bitcode reading/parsing, copy the
+  /// error code into the GlobalContext.
+  void transferErrorCode() const;
+
   /// Lowers the given list of global addresses to target. Generates
   /// list of corresponding variable declarations.
   void lowerGlobals(const VariableDeclarationListType &VariableDeclarations);
 
   /// 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);
 
 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;
+  std::unique_ptr<TargetGlobalLowering> GlobalLowering;
+  // Exit status of the translation. False is successful. True otherwise.
+  ErrorCode ErrorStatus;
 };
 
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICETRANSLATOR_H