Subzero: Improve class definition hygiene.

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
@@ skipping 72 matching lines @@
   // Begin is a copy of Insts.begin(), used if iterators are moved backward.
   InstList::iterator Begin;
   // End is a copy of Insts.end(), used if Next needs to be advanced.
   InstList::iterator End;
 
   void skipDeleted(InstList::iterator &I) const;
   void advanceForward(InstList::iterator &I) const;
 };
 
 class TargetLowering {
+  TargetLowering() = delete;
   TargetLowering(const TargetLowering &) = delete;
   TargetLowering &operator=(const TargetLowering &) = delete;
 
 public:
   static TargetLowering *createLowering(TargetArch Target, Cfg *Func);
   static std::unique_ptr<Assembler> createAssembler(TargetArch Target,
                                                     Cfg *Func);
   void translate() {
     switch (Ctx->getOptLevel()) {
     case Opt_m1:
@@ skipping 104 matching lines @@
 
   // Performs target-specific argument lowering.
   virtual void lowerArguments() = 0;
 
   virtual void addProlog(CfgNode *Node) = 0;
   virtual void addEpilog(CfgNode *Node) = 0;
 
   virtual ~TargetLowering() {}
 
 protected:
-  TargetLowering(Cfg *Func);
+  explicit TargetLowering(Cfg *Func);
   virtual void lowerAlloca(const InstAlloca *Inst) = 0;
   virtual void lowerArithmetic(const InstArithmetic *Inst) = 0;
   virtual void lowerAssign(const InstAssign *Inst) = 0;
   virtual void lowerBr(const InstBr *Inst) = 0;
   virtual void lowerCall(const InstCall *Inst) = 0;
   virtual void lowerCast(const InstCast *Inst) = 0;
   virtual void lowerFcmp(const InstFcmp *Inst) = 0;
   virtual void lowerExtractElement(const InstExtractElement *Inst) = 0;
   virtual void lowerIcmp(const InstIcmp *Inst) = 0;
   virtual void lowerInsertElement(const InstInsertElement *Inst) = 0;
@@ skipping 37 matching lines @@
 
 public:
   static std::unique_ptr<TargetDataLowering> createLowering(GlobalContext *Ctx);
   virtual ~TargetDataLowering();
 
   virtual void
   lowerGlobals(std::unique_ptr<VariableDeclarationList> Vars) const = 0;
   virtual void lowerConstants() const = 0;
 
 protected:
-  TargetDataLowering(GlobalContext *Ctx) : Ctx(Ctx) {}
+  explicit TargetDataLowering(GlobalContext *Ctx) : Ctx(Ctx) {}
   GlobalContext *Ctx;
 };
 
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICETARGETLOWERING_H