Convert Constant->emit() definitions to allow multiple targets to define them.

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, 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, external global
 // declarations, and internal constant pools.
 //
 //===----------------------------------------------------------------------===//
 
 #ifndef SUBZERO_SRC_ICETARGETLOWERING_H
 #define SUBZERO_SRC_ICETARGETLOWERING_H
 
 #include "IceDefs.h"
 #include "IceInst.h" // for the names of the Inst subtypes
+#include "IceOperand.h"
 #include "IceTypes.h"
 
 namespace Ice {
 
 // LoweringContext makes it easy to iterate through non-deleted
 // instructions in a node, and insert new (lowered) instructions at
 // the current point.  Along with the instruction list container and
 // associated iterators, it holds the current node, which is needed
 // when inserting new instructions in order to track whether variables
 // are used as single-block or multi-block.
@@ skipping 164 matching lines @@
   // sure to also call the parent class's methods.
   virtual void snapshotEmitState() {
     SnapshotStackAdjustment = StackAdjustment;
   }
   virtual void rollbackEmitState() {
     StackAdjustment = SnapshotStackAdjustment;
   }
 
   virtual void emitVariable(const Variable *Var) const = 0;
 
+  void emitWithoutPrefix(const ConstantRelocatable *CR) const;
+  void emit(const ConstantRelocatable *CR) const;
+  virtual const char *getConstantPrefix() const = 0;
+
+  virtual void emit(const ConstantUndef *C) const = 0;
+  virtual void emit(const ConstantInteger32 *C) const = 0;
+  virtual void emit(const ConstantInteger64 *C) const = 0;
+  virtual void emit(const ConstantFloat *C) const = 0;
+  virtual void emit(const ConstantDouble *C) const = 0;
+
   // Performs target-specific argument lowering.
   virtual void lowerArguments() = 0;
 
   virtual void addProlog(CfgNode *Node) = 0;
   virtual void addEpilog(CfgNode *Node) = 0;
 
   virtual ~TargetLowering() {}
 
 protected:
   explicit TargetLowering(Cfg *Func);
@@ skipping 92 matching lines @@
   virtual void lowerConstants() const = 0;
 
 protected:
   explicit TargetDataLowering(GlobalContext *Ctx) : Ctx(Ctx) {}
   GlobalContext *Ctx;
 };
 
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICETARGETLOWERING_H