Subzero: Emit functions and global initializers in a separate thread.

src/IceTargetLowering.h

 //===- subzero/src/IceTargetLowering.h - Lowering interface -----*- 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 TargetLowering and LoweringContext
-// classes.  TargetLowering is an abstract class used to drive the
-// translation/lowering process.  LoweringContext maintains a
-// context for lowering each instruction, offering conveniences such
-// as iterating over non-deleted instructions.
+// This file declares the TargetLowering, LoweringContext, and
+// TargetDataLowering classes.  TargetLowering is an abstract class
+// used to drive the translation/lowering process.  LoweringContext
+// maintains a context for lowering each instruction, offering
+// conveniences such as iterating over non-deleted instructions.
+// TargetDataLowering is an abstract class used to drive the
+// lowering/emission of global initializers.
 //
 //===----------------------------------------------------------------------===//
 
 #ifndef SUBZERO_SRC_ICETARGETLOWERING_H
 #define SUBZERO_SRC_ICETARGETLOWERING_H
 
 #include "IceDefs.h"
 #include "IceInst.h" // for the names of the Inst subtypes
 #include "IceTypes.h"
 
@@ skipping 215 matching lines @@
 
 // TargetDataLowering is used for "lowering" data including initializers
 // for global variables, and the internal constant pools.  It is separated
 // out from TargetLowering because it does not require a Cfg.
 class TargetDataLowering {
   TargetDataLowering() = delete;
   TargetDataLowering(const TargetDataLowering &) = delete;
   TargetDataLowering &operator=(const TargetDataLowering &) = delete;
 
 public:
-  static TargetDataLowering *createLowering(GlobalContext *Ctx);
+  static std::unique_ptr<TargetDataLowering> createLowering(GlobalContext *Ctx);
   virtual ~TargetDataLowering();
 
   virtual void lowerGlobal(const VariableDeclaration &Var) const = 0;
   virtual void lowerGlobalsELF(const VariableDeclarationList &Vars) const = 0;
-  virtual void lowerConstants(GlobalContext *Ctx) const = 0;
+  virtual void lowerConstants() const = 0;
 
 protected:
   TargetDataLowering(GlobalContext *Ctx) : Ctx(Ctx) {}
   GlobalContext *Ctx;
 };
 
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICETARGETLOWERING_H