//===-- llvm/Target/RegInfo.h - Target Register Information ------*- C++ -*-==// // // This file is used to describe the register system of a target to the // register allocator. // //===----------------------------------------------------------------------===// #ifndef LLVM_TARGET_MACHINEREGINFO_H #define LLVM_TARGET_MACHINEREGINFO_H #include "Support/NonCopyable.h" #include "Support/hash_map" #include class TargetMachine; class IGNode; class Type; class Value; class LiveRangeInfo; class Function; class LiveRange; class AddedInstrns; class MachineInstr; class PhyRegAlloc; class BasicBlock; //----------------------------------------------------------------------------- // class MachineRegClassInfo // // Purpose: // Interface to description of machine register class (e.g., int reg class // float reg class etc) // //-------------------------------------------------------------------------- class MachineRegClassInfo { protected: const unsigned RegClassID; // integer ID of a reg class const unsigned NumOfAvailRegs; // # of avail for coloring -without SP etc. const unsigned NumOfAllRegs; // # of all registers -including SP,g0 etc. public: inline unsigned getRegClassID() const { return RegClassID; } inline unsigned getNumOfAvailRegs() const { return NumOfAvailRegs; } inline unsigned getNumOfAllRegs() const { return NumOfAllRegs; } // This method should find a color which is not used by neighbors // (i.e., a false position in IsColorUsedArr) and virtual void colorIGNode(IGNode *Node, std::vector &IsColorUsedArr) const = 0; virtual bool isRegVolatile(int Reg) const = 0; MachineRegClassInfo(unsigned ID, unsigned NVR, unsigned NAR) : RegClassID(ID), NumOfAvailRegs(NVR), NumOfAllRegs(NAR) {} }; //--------------------------------------------------------------------------- // class MachineRegInfo // // Purpose: // Interface to register info of target machine // //-------------------------------------------------------------------------- class MachineRegInfo : public NonCopyableV { protected: // A vector of all machine register classes // std::vector MachineRegClassArr; public: const TargetMachine ⌖ MachineRegInfo(const TargetMachine& tgt) : target(tgt) { } ~MachineRegInfo() { for (unsigned i = 0, e = MachineRegClassArr.size(); i != e; ++i) delete MachineRegClassArr[i]; } // According the definition of a MachineOperand class, a Value in a // machine instruction can go into either a normal register or a // condition code register. If isCCReg is true below, the ID of the condition // code register class will be returned. Otherwise, the normal register // class (eg. int, float) must be returned. virtual unsigned getRegClassIDOfType (const Type *type, bool isCCReg = false) const =0; virtual unsigned getRegClassIDOfValue (const Value *Val, bool isCCReg = false) const =0; virtual unsigned getRegClassIDOfReg (int unifiedRegNum) const =0; virtual unsigned getRegClassIDOfRegType(int regType) const =0; inline unsigned int getNumOfRegClasses() const { return MachineRegClassArr.size(); } const MachineRegClassInfo *getMachineRegClass(unsigned i) const { return MachineRegClassArr[i]; } // returns the register that is hardwired to zero if any (-1 if none) // virtual int getZeroRegNum() const = 0; // Number of registers used for passing int args (usually 6: %o0 - %o5) // and float args (usually 32: %f0 - %f31) // virtual unsigned const GetNumOfIntArgRegs() const = 0; virtual unsigned const GetNumOfFloatArgRegs() const = 0; // The following methods are used to color special live ranges (e.g. // method args and return values etc.) with specific hardware registers // as required. See SparcRegInfo.cpp for the implementation for Sparc. // virtual void suggestRegs4MethodArgs(const Function *Func, LiveRangeInfo &LRI) const = 0; virtual void suggestRegs4CallArgs(MachineInstr *CallI, LiveRangeInfo &LRI) const = 0; virtual void suggestReg4RetValue(MachineInstr *RetI, LiveRangeInfo &LRI) const = 0; virtual void colorMethodArgs(const Function *Func, LiveRangeInfo &LRI, AddedInstrns *FirstAI) const = 0; virtual void colorCallArgs(MachineInstr *CalI, LiveRangeInfo& LRI, AddedInstrns *CallAI, PhyRegAlloc &PRA, const BasicBlock *BB) const = 0; virtual void colorRetValue(MachineInstr *RetI, LiveRangeInfo &LRI, AddedInstrns *RetAI) const = 0; // The following methods are used to generate "copy" machine instructions // for an architecture. Currently they are used in MachineRegClass // interface. However, they can be moved to MachineInstrInfo interface if // necessary. // // The function regTypeNeedsScratchReg() can be used to check whether a // scratch register is needed to copy a register of type `regType' to // or from memory. If so, such a scratch register can be provided by // the caller (e.g., if it knows which regsiters are free); otherwise // an arbitrary one will be chosen and spilled by the copy instructions. // If a scratch reg is needed, the reg. type that must be used // for scratch registers is returned in scratchRegType. // virtual bool regTypeNeedsScratchReg(int RegType, int& scratchRegType) const = 0; virtual void cpReg2RegMI(std::vector& mvec, unsigned SrcReg, unsigned DestReg, int RegType) const = 0; virtual void cpReg2MemMI(std::vector& mvec, unsigned SrcReg, unsigned DestPtrReg, int Offset, int RegType, int scratchReg = -1) const=0; virtual void cpMem2RegMI(std::vector& mvec, unsigned SrcPtrReg, int Offset, unsigned DestReg, int RegType, int scratchReg = -1) const=0; virtual void cpValue2Value(Value *Src, Value *Dest, std::vector& mvec) const = 0; virtual bool isRegVolatile(int RegClassID, int Reg) const = 0; // Returns the reg used for pushing the address when a method is called. // This can be used for other purposes between calls // virtual unsigned getCallAddressReg() const = 0; // Returns the register containing the return address. //It should be made sure that this // register contains the return value when a return instruction is reached. // virtual unsigned getReturnAddressReg() const = 0; // Each register class has a seperate space for register IDs. To convert // a regId in a register class to a common Id, or vice versa, // we use the folloing methods. // virtual int getUnifiedRegNum(unsigned regClassID, int reg) const = 0; virtual int getClassRegNum(int unifiedRegNum, unsigned& regClassID) const =0; // Returns the assembly-language name of the specified machine register. virtual const char * const getUnifiedRegName(int UnifiedRegNum) const = 0; // The following 4 methods are used to find the RegType (a target-specific // enum) for a reg class and a given primitive type, a LiveRange, a Value, // or a particular machine register. // The fifth function gives the reg class of the given RegType. // virtual int getRegType(unsigned regClassID, const Type* type) const = 0; virtual int getRegType(const LiveRange *LR) const = 0; virtual int getRegType(const Value *Val) const = 0; virtual int getRegType(int unifiedRegNum) const = 0; // The following methods are used to get the frame/stack pointers // virtual unsigned getFramePointer() const = 0; virtual unsigned getStackPointer() const = 0; // A register can be initialized to an invalid number. That number can // be obtained using this method. // virtual int getInvalidRegNum() const = 0; // Method for inserting caller saving code. The caller must save all the // volatile registers across a call based on the calling conventions of // an architecture. This must insert code for saving and restoring // such registers on // virtual void insertCallerSavingCode(std::vector& instrnsBefore, std::vector& instrnsAfter, MachineInstr *MInst, const BasicBlock *BB, PhyRegAlloc &PRA) const = 0; // This method gives the the number of bytes of stack spaceallocated // to a register when it is spilled to the stack. // virtual int getSpilledRegSize(int RegType) const = 0; }; #endif