Iasm and obj lowering for advanced switch lowering.

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.
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file
@@ skipping 159 matching lines @@
 
   bool hasComputedFrame() const { return HasComputedFrame; }
   /// Returns true if this function calls a function that has the
   /// "returns twice" attribute.
   bool callsReturnsTwice() const { return CallsReturnsTwice; }
   void setCallsReturnsTwice(bool RetTwice) { CallsReturnsTwice = RetTwice; }
   int32_t getStackAdjustment() const { return StackAdjustment; }
   void updateStackAdjustment(int32_t Offset) { StackAdjustment += Offset; }
   void resetStackAdjustment() { StackAdjustment = 0; }
   SizeT makeNextLabelNumber() { return NextLabelNumber++; }
+  SizeT makeNextJumpTableNumber() { return NextJumpTableNumber++; }
   LoweringContext &getContext() { return Context; }
 
   enum RegSet {
     RegSet_None = 0,
     RegSet_CallerSave = 1 << 0,
     RegSet_CalleeSave = 1 << 1,
     RegSet_StackPointer = 1 << 2,
     RegSet_FramePointer = 1 << 3,
     RegSet_All = ~RegSet_None
   };
@@ skipping 15 matching lines @@
   virtual void snapshotEmitState() {
     SnapshotStackAdjustment = StackAdjustment;
   }
   virtual void rollbackEmitState() {
     StackAdjustment = SnapshotStackAdjustment;
   }
 
   /// Get the minimum number of clusters required for a jump table to be
   /// considered.
   virtual SizeT getMinJumpTableSize() const = 0;
+  virtual void emitJumpTable(const Cfg *Func,
+                             const InstJumpTable *JumpTable) const = 0;
 
   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;
@@ skipping 106 matching lines @@
   }
 
   Cfg *Func;
   GlobalContext *Ctx;
   bool HasComputedFrame = false;
   bool CallsReturnsTwice = false;
   /// StackAdjustment keeps track of the current stack offset from its
   /// natural location, as arguments are pushed for a function call.
   int32_t StackAdjustment = 0;
   SizeT NextLabelNumber = 0;
+  SizeT NextJumpTableNumber = 0;
   LoweringContext Context;
 
   // Runtime helper function names
   const static constexpr char *H_bitcast_16xi1_i16 = "__Sz_bitcast_16xi1_i16";
   const static constexpr char *H_bitcast_8xi1_i8 = "__Sz_bitcast_8xi1_i8";
   const static constexpr char *H_bitcast_i16_16xi1 = "__Sz_bitcast_i16_16xi1";
   const static constexpr char *H_bitcast_i8_8xi1 = "__Sz_bitcast_i8_8xi1";
   const static constexpr char *H_call_ctpop_i32 = "__popcountsi2";
   const static constexpr char *H_call_ctpop_i64 = "__popcountdi2";
   const static constexpr char *H_call_longjmp = "longjmp";
@@ skipping 39 matching lines @@
   TargetDataLowering(const TargetDataLowering &) = delete;
   TargetDataLowering &operator=(const TargetDataLowering &) = delete;
 
 public:
   static std::unique_ptr<TargetDataLowering> createLowering(GlobalContext *Ctx);
   virtual ~TargetDataLowering();
 
   virtual void lowerGlobals(const VariableDeclarationList &Vars,
                             const IceString &SectionSuffix) = 0;
   virtual void lowerConstants() = 0;
+  virtual void lowerJumpTables() = 0;
 
 protected:
   void emitGlobal(const VariableDeclaration &Var,
                   const IceString &SectionSuffix);
 
   /// For now, we assume .long is the right directive for emitting 4 byte
   /// emit global relocations. However, LLVM MIPS usually uses .4byte instead.
   /// Perhaps there is some difference when the location is unaligned.
   static const char *getEmit32Directive() { return ".long"; }
 
@@ skipping 17 matching lines @@
   virtual void lower() {}
 
 protected:
   explicit TargetHeaderLowering(GlobalContext *Ctx) : Ctx(Ctx) {}
   GlobalContext *Ctx;
 };
 
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICETARGETLOWERING_H