2001-09-18 12:38:31 +00:00
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//===-- llvm/Target/RegInfo.h - Target Register Information ------*- C++ -*-==//
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//
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// This file is used to describe the register system of a target to the
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// register allocator.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_TARGET_MACHINEREGINFO_H
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#define LLVM_TARGET_MACHINEREGINFO_H
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2001-11-27 00:03:19 +00:00
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#include "Support/NonCopyable.h"
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2002-01-20 22:54:45 +00:00
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#include <ext/hash_map>
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2001-09-18 12:38:31 +00:00
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#include <string>
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2001-11-08 05:22:43 +00:00
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class TargetMachine;
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class IGNode;
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class Value;
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class LiveRangeInfo;
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class Method;
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class Instruction;
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class LiveRange;
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class AddedInstrns;
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class MachineInstr;
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class RegClass;
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class CallInst;
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class ReturnInst;
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class PhyRegAlloc;
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class BasicBlock;
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2001-09-18 12:38:31 +00:00
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//-----------------------------------------------------------------------------
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// class MachineRegClassInfo
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//
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// Purpose:
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// Interface to description of machine register class (e.g., int reg class
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// float reg class etc)
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//
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//--------------------------------------------------------------------------
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class MachineRegClassInfo {
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protected:
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const unsigned RegClassID; // integer ID of a reg class
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const unsigned NumOfAvailRegs; // # of avail for coloring -without SP etc.
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const unsigned NumOfAllRegs; // # of all registers -including SP,g0 etc.
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public:
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inline unsigned getRegClassID() const { return RegClassID; }
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inline unsigned getNumOfAvailRegs() const { return NumOfAvailRegs; }
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inline unsigned getNumOfAllRegs() const { return NumOfAllRegs; }
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// This method should find a color which is not used by neighbors
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// (i.e., a false position in IsColorUsedArr) and
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virtual void colorIGNode(IGNode *Node, bool IsColorUsedArr[]) const = 0;
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virtual bool isRegVolatile(int Reg) const = 0;
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MachineRegClassInfo(unsigned ID, unsigned NVR, unsigned NAR)
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: RegClassID(ID), NumOfAvailRegs(NVR), NumOfAllRegs(NAR) {}
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};
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//---------------------------------------------------------------------------
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// class MachineRegInfo
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//
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// Purpose:
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// Interface to register info of target machine
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//
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//--------------------------------------------------------------------------
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class MachineRegInfo : public NonCopyableV {
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protected:
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// A vector of all machine register classes
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//
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std::vector<const MachineRegClassInfo *> MachineRegClassArr;
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public:
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const TargetMachine ⌖
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MachineRegInfo(const TargetMachine& tgt) : target(tgt) { }
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// According the definition of a MachineOperand class, a Value in a
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// machine instruction can go into either a normal register or a
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// condition code register. If isCCReg is true below, the ID of the condition
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// code regiter class will be returned. Otherwise, the normal register
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// class (eg. int, float) must be returned.
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virtual unsigned getRegClassIDOfValue (const Value *Val,
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bool isCCReg = false) const =0;
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inline unsigned int getNumOfRegClasses() const {
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return MachineRegClassArr.size();
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}
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const MachineRegClassInfo *getMachineRegClass(unsigned i) const {
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return MachineRegClassArr[i];
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}
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// returns the register that is hardwired to zero if any (-1 if none)
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//
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virtual int getZeroRegNum() const = 0;
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// The following methods are used to color special live ranges (e.g.
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// method args and return values etc.) with specific hardware registers
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// as required. See SparcRegInfo.cpp for the implementation for Sparc.
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//
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virtual void suggestRegs4MethodArgs(const Method *Meth,
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LiveRangeInfo &LRI) const = 0;
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virtual void suggestRegs4CallArgs(const MachineInstr *CallI,
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LiveRangeInfo &LRI, std::vector<RegClass *> RCL) const = 0;
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virtual void suggestReg4RetValue(const MachineInstr *RetI,
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LiveRangeInfo &LRI) const = 0;
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virtual void colorMethodArgs(const Method *Meth, LiveRangeInfo &LRI,
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AddedInstrns *FirstAI) const = 0;
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virtual void colorCallArgs(const MachineInstr *CalI,
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LiveRangeInfo& LRI, AddedInstrns *CallAI,
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PhyRegAlloc &PRA, const BasicBlock *BB) const = 0;
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virtual void colorRetValue(const MachineInstr *RetI, LiveRangeInfo &LRI,
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AddedInstrns *RetAI) const = 0;
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// The following methods are used to generate "copy" machine instructions
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// for an architecture. Currently they are used in MachineRegClass
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// interface. However, they can be moved to MachineInstrInfo interface if
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// necessary.
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//
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virtual MachineInstr *cpReg2RegMI(unsigned SrcReg, unsigned DestReg,
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int RegType) const = 0;
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virtual MachineInstr *cpReg2MemMI(unsigned SrcReg, unsigned DestPtrReg,
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int Offset, int RegType) const = 0;
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virtual MachineInstr *cpMem2RegMI(unsigned SrcPtrReg, int Offset,
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unsigned DestReg, int RegType) const = 0;
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virtual MachineInstr *cpValue2Value(Value *Src, Value *Dest) const = 0;
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virtual bool isRegVolatile(int RegClassID, int Reg) const = 0;
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// Returns the reg used for pushing the address when a method is called.
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// This can be used for other purposes between calls
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//
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virtual unsigned getCallAddressReg() const = 0;
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// Returns the register containing the return address.
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//It should be made sure that this
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// register contains the return value when a return instruction is reached.
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//
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virtual unsigned getReturnAddressReg() const = 0;
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// Each register class has a seperate space for register IDs. To convert
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// a regId in a register class to a common Id, we use the folloing method(s)
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//
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virtual int getUnifiedRegNum(int RegClassID, int reg) const = 0;
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virtual const std::string getUnifiedRegName(int UnifiedRegNum) const = 0;
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// Gives the type of a register based on the type of the LR
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//
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virtual int getRegType(const LiveRange *LR) const = 0;
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// Gives the return value contained in a CALL machine instruction
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//
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virtual const Value *getCallInstRetVal(const MachineInstr *CallMI) const = 0;
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// The following methods are used to get the frame/stack pointers
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//
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virtual unsigned getFramePointer() const = 0;
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virtual unsigned getStackPointer() const = 0;
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// A register can be initialized to an invalid number. That number can
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// be obtained using this method.
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//
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virtual int getInvalidRegNum() const = 0;
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// Method for inserting caller saving code. The caller must save all the
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// volatile registers across a call based on the calling conventions of
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// an architecture. This must insert code for saving and restoring
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// such registers on
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//
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2001-10-28 18:14:15 +00:00
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virtual void insertCallerSavingCode(const MachineInstr *MInst,
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const BasicBlock *BB,
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PhyRegAlloc &PRA) const = 0;
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2002-01-07 19:57:37 +00:00
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// This method gives the the number of bytes of stack spaceallocated
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// to a register when it is spilled to the stack.
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//
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virtual int getSpilledRegSize(int RegType) const = 0;
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};
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2001-09-18 22:57:47 +00:00
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#endif
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