1 //===-- llvm/CodeGen/MachineOperand.h - MachineOperand class ----*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file contains the declaration of the MachineOperand class.
12 //===----------------------------------------------------------------------===//
14 #ifndef LLVM_CODEGEN_MACHINEOPERAND_H
15 #define LLVM_CODEGEN_MACHINEOPERAND_H
17 #include "llvm/Support/DataTypes.h"
24 class MachineBasicBlock;
28 class MachineRegisterInfo;
31 /// MachineOperand class - Representation of each machine instruction operand.
33 class MachineOperand {
35 enum MachineOperandType {
36 MO_Register, // Register operand.
37 MO_Immediate, // Immediate Operand
39 MO_MachineBasicBlock, // MachineBasicBlock reference
40 MO_FrameIndex, // Abstract Stack Frame Index
41 MO_ConstantPoolIndex, // Address of indexed Constant in Constant Pool
42 MO_JumpTableIndex, // Address of indexed Jump Table for switch
43 MO_ExternalSymbol, // Name of external global symbol
44 MO_GlobalAddress // Address of a global value
48 /// OpKind - Specify what kind of operand this is. This discriminates the
50 MachineOperandType OpKind : 8;
52 /// IsDef/IsImp/IsKill/IsDead flags - These are only valid for MO_Register
55 /// IsDef - True if this is a def, false if this is a use of the register.
59 /// IsImp - True if this is an implicit def or use, false if it is explicit.
63 /// IsKill - True if this instruction is the last use of the register on this
64 /// path through the function. This is only valid on uses of registers.
67 /// IsDead - True if this register is never used by a subsequent instruction.
68 /// This is only valid on definitions of registers.
71 /// IsEarlyClobber flag - this is only valid for MO_Register operands in
74 /// IsEarlyClobber - True if this operand is marked earlyclobber in an
75 /// inline asm. See gcc doc for description of earlyclobber.
76 bool IsEarlyClobber : 1;
78 /// SubReg - Subregister number, only valid for MO_Register. A value of 0
79 /// indicates the MO_Register has no subReg.
82 /// ParentMI - This is the instruction that this operand is embedded into.
83 /// This is valid for all operand types, when the operand is in an instr.
84 MachineInstr *ParentMI;
86 /// Contents union - This contains the payload for the various operand types.
88 MachineBasicBlock *MBB; // For MO_MachineBasicBlock.
89 const ConstantFP *CFP; // For MO_FPImmediate.
90 int64_t ImmVal; // For MO_Immediate.
92 struct { // For MO_Register.
94 MachineOperand **Prev; // Access list for register.
98 /// OffsetedInfo - This struct contains the offset and an object identifier.
99 /// this represent the object as with an optional offset from it.
102 int Index; // For MO_*Index - The index itself.
103 const char *SymbolName; // For MO_ExternalSymbol.
104 GlobalValue *GV; // For MO_GlobalAddress.
106 int Offset; // An offset from the object.
110 explicit MachineOperand(MachineOperandType K) : OpKind(K), ParentMI(0) {}
112 MachineOperand(const MachineOperand &M) {
118 /// getType - Returns the MachineOperandType for this operand.
120 MachineOperandType getType() const { return OpKind; }
122 /// getParent - Return the instruction that this operand belongs to.
124 MachineInstr *getParent() { return ParentMI; }
125 const MachineInstr *getParent() const { return ParentMI; }
127 void print(std::ostream &os, const TargetMachine *TM = 0) const;
128 void print(raw_ostream &os, const TargetMachine *TM = 0) const;
130 /// Accessors that tell you what kind of MachineOperand you're looking at.
132 bool isRegister() const { return OpKind == MO_Register; }
133 bool isImmediate() const { return OpKind == MO_Immediate; }
134 bool isFPImmediate() const { return OpKind == MO_FPImmediate; }
135 bool isMachineBasicBlock() const { return OpKind == MO_MachineBasicBlock; }
136 bool isFrameIndex() const { return OpKind == MO_FrameIndex; }
137 bool isConstantPoolIndex() const { return OpKind == MO_ConstantPoolIndex; }
138 bool isJumpTableIndex() const { return OpKind == MO_JumpTableIndex; }
139 bool isGlobalAddress() const { return OpKind == MO_GlobalAddress; }
140 bool isExternalSymbol() const { return OpKind == MO_ExternalSymbol; }
142 //===--------------------------------------------------------------------===//
143 // Accessors for Register Operands
144 //===--------------------------------------------------------------------===//
146 /// getReg - Returns the register number.
147 unsigned getReg() const {
148 assert(isRegister() && "This is not a register operand!");
149 return Contents.Reg.RegNo;
152 unsigned getSubReg() const {
153 assert(isRegister() && "Wrong MachineOperand accessor");
154 return (unsigned)SubReg;
158 assert(isRegister() && "Wrong MachineOperand accessor");
163 assert(isRegister() && "Wrong MachineOperand accessor");
167 bool isImplicit() const {
168 assert(isRegister() && "Wrong MachineOperand accessor");
172 bool isDead() const {
173 assert(isRegister() && "Wrong MachineOperand accessor");
177 bool isKill() const {
178 assert(isRegister() && "Wrong MachineOperand accessor");
182 bool isEarlyClobber() const {
183 assert(isRegister() && "Wrong MachineOperand accessor");
184 return IsEarlyClobber;
187 /// getNextOperandForReg - Return the next MachineOperand in the function that
188 /// uses or defines this register.
189 MachineOperand *getNextOperandForReg() const {
190 assert(isRegister() && "This is not a register operand!");
191 return Contents.Reg.Next;
194 //===--------------------------------------------------------------------===//
195 // Mutators for Register Operands
196 //===--------------------------------------------------------------------===//
198 /// Change the register this operand corresponds to.
200 void setReg(unsigned Reg);
202 void setSubReg(unsigned subReg) {
203 assert(isRegister() && "Wrong MachineOperand accessor");
204 SubReg = (unsigned char)subReg;
207 void setIsUse(bool Val = true) {
208 assert(isRegister() && "Wrong MachineOperand accessor");
212 void setIsDef(bool Val = true) {
213 assert(isRegister() && "Wrong MachineOperand accessor");
217 void setImplicit(bool Val = true) {
218 assert(isRegister() && "Wrong MachineOperand accessor");
222 void setIsKill(bool Val = true) {
223 assert(isRegister() && !IsDef && "Wrong MachineOperand accessor");
227 void setIsDead(bool Val = true) {
228 assert(isRegister() && IsDef && "Wrong MachineOperand accessor");
232 void setIsEarlyClobber(bool Val = true) {
233 assert(isRegister() && IsDef && "Wrong MachineOperand accessor");
234 IsEarlyClobber = Val;
237 //===--------------------------------------------------------------------===//
238 // Accessors for various operand types.
239 //===--------------------------------------------------------------------===//
241 int64_t getImm() const {
242 assert(isImmediate() && "Wrong MachineOperand accessor");
243 return Contents.ImmVal;
246 const ConstantFP *getFPImm() const {
247 assert(isFPImmediate() && "Wrong MachineOperand accessor");
251 MachineBasicBlock *getMBB() const {
252 assert(isMachineBasicBlock() && "Wrong MachineOperand accessor");
256 int getIndex() const {
257 assert((isFrameIndex() || isConstantPoolIndex() || isJumpTableIndex()) &&
258 "Wrong MachineOperand accessor");
259 return Contents.OffsetedInfo.Val.Index;
262 GlobalValue *getGlobal() const {
263 assert(isGlobalAddress() && "Wrong MachineOperand accessor");
264 return Contents.OffsetedInfo.Val.GV;
267 int getOffset() const {
268 assert((isGlobalAddress() || isExternalSymbol() || isConstantPoolIndex()) &&
269 "Wrong MachineOperand accessor");
270 return Contents.OffsetedInfo.Offset;
273 const char *getSymbolName() const {
274 assert(isExternalSymbol() && "Wrong MachineOperand accessor");
275 return Contents.OffsetedInfo.Val.SymbolName;
278 //===--------------------------------------------------------------------===//
279 // Mutators for various operand types.
280 //===--------------------------------------------------------------------===//
282 void setImm(int64_t immVal) {
283 assert(isImmediate() && "Wrong MachineOperand mutator");
284 Contents.ImmVal = immVal;
287 void setOffset(int Offset) {
288 assert((isGlobalAddress() || isExternalSymbol() || isConstantPoolIndex()) &&
289 "Wrong MachineOperand accessor");
290 Contents.OffsetedInfo.Offset = Offset;
293 void setIndex(int Idx) {
294 assert((isFrameIndex() || isConstantPoolIndex() || isJumpTableIndex()) &&
295 "Wrong MachineOperand accessor");
296 Contents.OffsetedInfo.Val.Index = Idx;
299 void setMBB(MachineBasicBlock *MBB) {
300 assert(isMachineBasicBlock() && "Wrong MachineOperand accessor");
304 //===--------------------------------------------------------------------===//
306 //===--------------------------------------------------------------------===//
308 /// isIdenticalTo - Return true if this operand is identical to the specified
309 /// operand. Note: This method ignores isKill and isDead properties.
310 bool isIdenticalTo(const MachineOperand &Other) const;
312 /// ChangeToImmediate - Replace this operand with a new immediate operand of
313 /// the specified value. If an operand is known to be an immediate already,
314 /// the setImm method should be used.
315 void ChangeToImmediate(int64_t ImmVal);
317 /// ChangeToRegister - Replace this operand with a new register operand of
318 /// the specified value. If an operand is known to be an register already,
319 /// the setReg method should be used.
320 void ChangeToRegister(unsigned Reg, bool isDef, bool isImp = false,
321 bool isKill = false, bool isDead = false,
322 bool isEarlyClobber = false);
324 //===--------------------------------------------------------------------===//
325 // Construction methods.
326 //===--------------------------------------------------------------------===//
328 static MachineOperand CreateImm(int64_t Val) {
329 MachineOperand Op(MachineOperand::MO_Immediate);
334 static MachineOperand CreateFPImm(const ConstantFP *CFP) {
335 MachineOperand Op(MachineOperand::MO_FPImmediate);
336 Op.Contents.CFP = CFP;
340 static MachineOperand CreateReg(unsigned Reg, bool isDef, bool isImp = false,
341 bool isKill = false, bool isDead = false,
343 bool isEarlyClobber = false) {
344 MachineOperand Op(MachineOperand::MO_Register);
349 Op.IsEarlyClobber = isEarlyClobber;
350 Op.Contents.Reg.RegNo = Reg;
351 Op.Contents.Reg.Prev = 0;
352 Op.Contents.Reg.Next = 0;
356 static MachineOperand CreateMBB(MachineBasicBlock *MBB) {
357 MachineOperand Op(MachineOperand::MO_MachineBasicBlock);
361 static MachineOperand CreateFI(unsigned Idx) {
362 MachineOperand Op(MachineOperand::MO_FrameIndex);
366 static MachineOperand CreateCPI(unsigned Idx, int Offset) {
367 MachineOperand Op(MachineOperand::MO_ConstantPoolIndex);
369 Op.setOffset(Offset);
372 static MachineOperand CreateJTI(unsigned Idx) {
373 MachineOperand Op(MachineOperand::MO_JumpTableIndex);
377 static MachineOperand CreateGA(GlobalValue *GV, int Offset) {
378 MachineOperand Op(MachineOperand::MO_GlobalAddress);
379 Op.Contents.OffsetedInfo.Val.GV = GV;
380 Op.setOffset(Offset);
383 static MachineOperand CreateES(const char *SymName, int Offset = 0) {
384 MachineOperand Op(MachineOperand::MO_ExternalSymbol);
385 Op.Contents.OffsetedInfo.Val.SymbolName = SymName;
386 Op.setOffset(Offset);
389 const MachineOperand &operator=(const MachineOperand &MO) {
395 IsEarlyClobber = MO.IsEarlyClobber;
397 ParentMI = MO.ParentMI;
398 Contents = MO.Contents;
402 friend class MachineInstr;
403 friend class MachineRegisterInfo;
405 //===--------------------------------------------------------------------===//
406 // Methods for handling register use/def lists.
407 //===--------------------------------------------------------------------===//
409 /// isOnRegUseList - Return true if this operand is on a register use/def list
410 /// or false if not. This can only be called for register operands that are
411 /// part of a machine instruction.
412 bool isOnRegUseList() const {
413 assert(isRegister() && "Can only add reg operand to use lists");
414 return Contents.Reg.Prev != 0;
417 /// AddRegOperandToRegInfo - Add this register operand to the specified
418 /// MachineRegisterInfo. If it is null, then the next/prev fields should be
419 /// explicitly nulled out.
420 void AddRegOperandToRegInfo(MachineRegisterInfo *RegInfo);
422 void RemoveRegOperandFromRegInfo() {
423 assert(isOnRegUseList() && "Reg operand is not on a use list");
424 // Unlink this from the doubly linked list of operands.
425 MachineOperand *NextOp = Contents.Reg.Next;
426 *Contents.Reg.Prev = NextOp;
428 assert(NextOp->getReg() == getReg() && "Corrupt reg use/def chain!");
429 NextOp->Contents.Reg.Prev = Contents.Reg.Prev;
431 Contents.Reg.Prev = 0;
432 Contents.Reg.Next = 0;
436 inline std::ostream &operator<<(std::ostream &OS, const MachineOperand &MO) {
441 inline raw_ostream &operator<<(raw_ostream &OS, const MachineOperand& MO) {
446 } // End llvm namespace