1 //===-- llvm/Target/RegInfo.h - Target Register Information ------*- C++ -*-==//
3 // This file is used to describe the register system of a target to the
6 //===----------------------------------------------------------------------===//
8 #ifndef LLVM_TARGET_MACHINEREGINFO_H
9 #define LLVM_TARGET_MACHINEREGINFO_H
11 #include "Support/NonCopyable.h"
12 #include <ext/hash_map>
31 //-----------------------------------------------------------------------------
32 // class MachineRegClassInfo
35 // Interface to description of machine register class (e.g., int reg class
36 // float reg class etc)
38 //--------------------------------------------------------------------------
41 class MachineRegClassInfo {
43 const unsigned RegClassID; // integer ID of a reg class
44 const unsigned NumOfAvailRegs; // # of avail for coloring -without SP etc.
45 const unsigned NumOfAllRegs; // # of all registers -including SP,g0 etc.
48 inline unsigned getRegClassID() const { return RegClassID; }
49 inline unsigned getNumOfAvailRegs() const { return NumOfAvailRegs; }
50 inline unsigned getNumOfAllRegs() const { return NumOfAllRegs; }
52 // This method should find a color which is not used by neighbors
53 // (i.e., a false position in IsColorUsedArr) and
54 virtual void colorIGNode(IGNode *Node,
55 std::vector<bool> &IsColorUsedArr) const = 0;
56 virtual bool isRegVolatile(int Reg) const = 0;
58 MachineRegClassInfo(unsigned ID, unsigned NVR, unsigned NAR)
59 : RegClassID(ID), NumOfAvailRegs(NVR), NumOfAllRegs(NAR) {}
64 //---------------------------------------------------------------------------
65 // class MachineRegInfo
68 // Interface to register info of target machine
70 //--------------------------------------------------------------------------
72 class MachineRegInfo : public NonCopyableV {
74 // A vector of all machine register classes
76 std::vector<const MachineRegClassInfo *> MachineRegClassArr;
79 const TargetMachine ⌖
81 MachineRegInfo(const TargetMachine& tgt) : target(tgt) { }
83 for (unsigned i = 0, e = MachineRegClassArr.size(); i != e; ++i)
84 delete MachineRegClassArr[i];
87 // According the definition of a MachineOperand class, a Value in a
88 // machine instruction can go into either a normal register or a
89 // condition code register. If isCCReg is true below, the ID of the condition
90 // code regiter class will be returned. Otherwise, the normal register
91 // class (eg. int, float) must be returned.
92 virtual unsigned getRegClassIDOfType (const Type *type,
93 bool isCCReg = false) const =0;
94 virtual unsigned getRegClassIDOfValue (const Value *Val,
95 bool isCCReg = false) const =0;
98 inline unsigned int getNumOfRegClasses() const {
99 return MachineRegClassArr.size();
102 const MachineRegClassInfo *getMachineRegClass(unsigned i) const {
103 return MachineRegClassArr[i];
106 // returns the register that is hardwired to zero if any (-1 if none)
108 virtual int getZeroRegNum() const = 0;
110 // Number of registers used for passing int args (usually 6: %o0 - %o5)
111 // and float args (usually 32: %f0 - %f31)
113 virtual unsigned const GetNumOfIntArgRegs() const = 0;
114 virtual unsigned const GetNumOfFloatArgRegs() const = 0;
116 // The following methods are used to color special live ranges (e.g.
117 // method args and return values etc.) with specific hardware registers
118 // as required. See SparcRegInfo.cpp for the implementation for Sparc.
120 virtual void suggestRegs4MethodArgs(const Function *Func,
121 LiveRangeInfo &LRI) const = 0;
123 virtual void suggestRegs4CallArgs(const MachineInstr *CallI,
124 LiveRangeInfo &LRI, std::vector<RegClass *> RCL) const = 0;
126 virtual void suggestReg4RetValue(const MachineInstr *RetI,
127 LiveRangeInfo &LRI) const = 0;
129 virtual void colorMethodArgs(const Function *Func, LiveRangeInfo &LRI,
130 AddedInstrns *FirstAI) const = 0;
132 virtual void colorCallArgs(const MachineInstr *CalI,
133 LiveRangeInfo& LRI, AddedInstrns *CallAI,
134 PhyRegAlloc &PRA, const BasicBlock *BB) const = 0;
136 virtual void colorRetValue(const MachineInstr *RetI, LiveRangeInfo &LRI,
137 AddedInstrns *RetAI) const = 0;
141 // The following methods are used to generate "copy" machine instructions
142 // for an architecture. Currently they are used in MachineRegClass
143 // interface. However, they can be moved to MachineInstrInfo interface if
146 virtual void cpReg2RegMI(unsigned SrcReg, unsigned DestReg,
147 int RegType, vector<MachineInstr*>& mvec) const = 0;
149 virtual void cpReg2MemMI(unsigned SrcReg, unsigned DestPtrReg, int Offset,
150 int RegTypee, vector<MachineInstr*>& mvec) const=0;
152 virtual void cpMem2RegMI(unsigned SrcPtrReg, int Offset, unsigned DestReg,
153 int RegTypee, vector<MachineInstr*>& mvec) const=0;
155 virtual void cpValue2Value(Value *Src, Value *Dest,
156 vector<MachineInstr*>& mvec) const = 0;
158 virtual bool isRegVolatile(int RegClassID, int Reg) const = 0;
160 // Returns the reg used for pushing the address when a method is called.
161 // This can be used for other purposes between calls
163 virtual unsigned getCallAddressReg() const = 0;
165 // Returns the register containing the return address.
166 //It should be made sure that this
167 // register contains the return value when a return instruction is reached.
169 virtual unsigned getReturnAddressReg() const = 0;
172 // Each register class has a seperate space for register IDs. To convert
173 // a regId in a register class to a common Id, we use the folloing method(s)
175 virtual int getUnifiedRegNum(int RegClassID, int reg) const = 0;
177 virtual const std::string getUnifiedRegName(int UnifiedRegNum) const = 0;
180 // The following 4 methods are used to find the RegType (see enum above)
181 // of a LiveRange, Value and using the unified RegClassID
183 virtual int getRegType(unsigned regClassID, const Type* type) const = 0;
184 virtual int getRegType(const LiveRange *LR) const = 0;
185 virtual int getRegType(const Value *Val) const = 0;
186 virtual int getRegType(int reg) const = 0;
189 // The following methods are used to get the frame/stack pointers
191 virtual unsigned getFramePointer() const = 0;
192 virtual unsigned getStackPointer() const = 0;
194 // A register can be initialized to an invalid number. That number can
195 // be obtained using this method.
197 virtual int getInvalidRegNum() const = 0;
200 // Method for inserting caller saving code. The caller must save all the
201 // volatile registers across a call based on the calling conventions of
202 // an architecture. This must insert code for saving and restoring
205 virtual void insertCallerSavingCode(const MachineInstr *MInst,
206 const BasicBlock *BB,
207 PhyRegAlloc &PRA) const = 0;
209 // This method gives the the number of bytes of stack spaceallocated
210 // to a register when it is spilled to the stack.
212 virtual int getSpilledRegSize(int RegType) const = 0;