1 //===-- CodeGen/MachineInstBuilder.h - Simplify creation of MIs -*- C++ -*-===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // This file exposes a function named BuildMI, which is useful for dramatically 11 // simplifying how MachineInstr's are created. It allows use of code like this: 12 // 13 // M = BuildMI(X86::ADDrr8, 2).addReg(argVal1).addReg(argVal2); 14 // 15 //===----------------------------------------------------------------------===// 16 17 #ifndef LLVM_CODEGEN_MACHINEINSTRBUILDER_H 18 #define LLVM_CODEGEN_MACHINEINSTRBUILDER_H 19 20 #include "llvm/CodeGen/MachineFunction.h" 21 #include "llvm/CodeGen/MachineInstrBundle.h" 22 #include "llvm/Support/ErrorHandling.h" 23 24 namespace llvm { 25 26 class MCInstrDesc; 27 class MDNode; 28 29 namespace RegState { 30 enum { 31 Define = 0x2, 32 Implicit = 0x4, 33 Kill = 0x8, 34 Dead = 0x10, 35 Undef = 0x20, 36 EarlyClobber = 0x40, 37 Debug = 0x80, 38 InternalRead = 0x100, 39 DefineNoRead = Define | Undef, 40 ImplicitDefine = Implicit | Define, 41 ImplicitKill = Implicit | Kill 42 }; 43 } 44 45 class MachineInstrBuilder { 46 MachineFunction *MF; 47 MachineInstr *MI; 48 public: 49 MachineInstrBuilder() : MF(0), MI(0) {} 50 51 /// Create a MachineInstrBuilder for manipulating an existing instruction. 52 /// F must be the machine function that was used to allocate I. 53 MachineInstrBuilder(MachineFunction &F, MachineInstr *I) : MF(&F), MI(I) {} 54 55 /// Allow automatic conversion to the machine instruction we are working on. 56 /// 57 operator MachineInstr*() const { return MI; } 58 MachineInstr *operator->() const { return MI; } 59 operator MachineBasicBlock::iterator() const { return MI; } 60 61 /// addReg - Add a new virtual register operand... 62 /// 63 const 64 MachineInstrBuilder &addReg(unsigned RegNo, unsigned flags = 0, 65 unsigned SubReg = 0) const { 66 assert((flags & 0x1) == 0 && 67 "Passing in 'true' to addReg is forbidden! Use enums instead."); 68 MI->addOperand(*MF, MachineOperand::CreateReg(RegNo, 69 flags & RegState::Define, 70 flags & RegState::Implicit, 71 flags & RegState::Kill, 72 flags & RegState::Dead, 73 flags & RegState::Undef, 74 flags & RegState::EarlyClobber, 75 SubReg, 76 flags & RegState::Debug, 77 flags & RegState::InternalRead)); 78 return *this; 79 } 80 81 /// addImm - Add a new immediate operand. 82 /// 83 const MachineInstrBuilder &addImm(int64_t Val) const { 84 MI->addOperand(*MF, MachineOperand::CreateImm(Val)); 85 return *this; 86 } 87 88 const MachineInstrBuilder &addCImm(const ConstantInt *Val) const { 89 MI->addOperand(*MF, MachineOperand::CreateCImm(Val)); 90 return *this; 91 } 92 93 const MachineInstrBuilder &addFPImm(const ConstantFP *Val) const { 94 MI->addOperand(*MF, MachineOperand::CreateFPImm(Val)); 95 return *this; 96 } 97 98 const MachineInstrBuilder &addMBB(MachineBasicBlock *MBB, 99 unsigned char TargetFlags = 0) const { 100 MI->addOperand(*MF, MachineOperand::CreateMBB(MBB, TargetFlags)); 101 return *this; 102 } 103 104 const MachineInstrBuilder &addFrameIndex(int Idx) const { 105 MI->addOperand(*MF, MachineOperand::CreateFI(Idx)); 106 return *this; 107 } 108 109 const MachineInstrBuilder &addConstantPoolIndex(unsigned Idx, 110 int Offset = 0, 111 unsigned char TargetFlags = 0) const { 112 MI->addOperand(*MF, MachineOperand::CreateCPI(Idx, Offset, TargetFlags)); 113 return *this; 114 } 115 116 const MachineInstrBuilder &addTargetIndex(unsigned Idx, int64_t Offset = 0, 117 unsigned char TargetFlags = 0) const { 118 MI->addOperand(*MF, MachineOperand::CreateTargetIndex(Idx, Offset, 119 TargetFlags)); 120 return *this; 121 } 122 123 const MachineInstrBuilder &addJumpTableIndex(unsigned Idx, 124 unsigned char TargetFlags = 0) const { 125 MI->addOperand(*MF, MachineOperand::CreateJTI(Idx, TargetFlags)); 126 return *this; 127 } 128 129 const MachineInstrBuilder &addGlobalAddress(const GlobalValue *GV, 130 int64_t Offset = 0, 131 unsigned char TargetFlags = 0) const { 132 MI->addOperand(*MF, MachineOperand::CreateGA(GV, Offset, TargetFlags)); 133 return *this; 134 } 135 136 const MachineInstrBuilder &addExternalSymbol(const char *FnName, 137 unsigned char TargetFlags = 0) const { 138 MI->addOperand(*MF, MachineOperand::CreateES(FnName, TargetFlags)); 139 return *this; 140 } 141 142 const MachineInstrBuilder &addBlockAddress(const BlockAddress *BA, 143 int64_t Offset = 0, 144 unsigned char TargetFlags = 0) const { 145 MI->addOperand(*MF, MachineOperand::CreateBA(BA, Offset, TargetFlags)); 146 return *this; 147 } 148 149 const MachineInstrBuilder &addRegMask(const uint32_t *Mask) const { 150 MI->addOperand(*MF, MachineOperand::CreateRegMask(Mask)); 151 return *this; 152 } 153 154 const MachineInstrBuilder &addMemOperand(MachineMemOperand *MMO) const { 155 MI->addMemOperand(*MF, MMO); 156 return *this; 157 } 158 159 const MachineInstrBuilder &setMemRefs(MachineInstr::mmo_iterator b, 160 MachineInstr::mmo_iterator e) const { 161 MI->setMemRefs(b, e); 162 return *this; 163 } 164 165 166 const MachineInstrBuilder &addOperand(const MachineOperand &MO) const { 167 MI->addOperand(*MF, MO); 168 return *this; 169 } 170 171 const MachineInstrBuilder &addMetadata(const MDNode *MD) const { 172 MI->addOperand(*MF, MachineOperand::CreateMetadata(MD)); 173 return *this; 174 } 175 176 const MachineInstrBuilder &addSym(MCSymbol *Sym) const { 177 MI->addOperand(*MF, MachineOperand::CreateMCSymbol(Sym)); 178 return *this; 179 } 180 181 const MachineInstrBuilder &setMIFlags(unsigned Flags) const { 182 MI->setFlags(Flags); 183 return *this; 184 } 185 186 const MachineInstrBuilder &setMIFlag(MachineInstr::MIFlag Flag) const { 187 MI->setFlag(Flag); 188 return *this; 189 } 190 191 // Add a displacement from an existing MachineOperand with an added offset. 192 const MachineInstrBuilder &addDisp(const MachineOperand &Disp, int64_t off, 193 unsigned char TargetFlags = 0) const { 194 switch (Disp.getType()) { 195 default: 196 llvm_unreachable("Unhandled operand type in addDisp()"); 197 case MachineOperand::MO_Immediate: 198 return addImm(Disp.getImm() + off); 199 case MachineOperand::MO_GlobalAddress: { 200 // If caller specifies new TargetFlags then use it, otherwise the 201 // default behavior is to copy the target flags from the existing 202 // MachineOperand. This means if the caller wants to clear the 203 // target flags it needs to do so explicitly. 204 if (TargetFlags) 205 return addGlobalAddress(Disp.getGlobal(), Disp.getOffset() + off, 206 TargetFlags); 207 return addGlobalAddress(Disp.getGlobal(), Disp.getOffset() + off, 208 Disp.getTargetFlags()); 209 } 210 } 211 } 212 213 /// Copy all the implicit operands from OtherMI onto this one. 214 const MachineInstrBuilder ©ImplicitOps(const MachineInstr *OtherMI) { 215 MI->copyImplicitOps(*MF, OtherMI); 216 return *this; 217 } 218 }; 219 220 /// BuildMI - Builder interface. Specify how to create the initial instruction 221 /// itself. 222 /// 223 inline MachineInstrBuilder BuildMI(MachineFunction &MF, 224 DebugLoc DL, 225 const MCInstrDesc &MCID) { 226 return MachineInstrBuilder(MF, MF.CreateMachineInstr(MCID, DL)); 227 } 228 229 /// BuildMI - This version of the builder sets up the first operand as a 230 /// destination virtual register. 231 /// 232 inline MachineInstrBuilder BuildMI(MachineFunction &MF, 233 DebugLoc DL, 234 const MCInstrDesc &MCID, 235 unsigned DestReg) { 236 return MachineInstrBuilder(MF, MF.CreateMachineInstr(MCID, DL)) 237 .addReg(DestReg, RegState::Define); 238 } 239 240 /// BuildMI - This version of the builder inserts the newly-built 241 /// instruction before the given position in the given MachineBasicBlock, and 242 /// sets up the first operand as a destination virtual register. 243 /// 244 inline MachineInstrBuilder BuildMI(MachineBasicBlock &BB, 245 MachineBasicBlock::iterator I, 246 DebugLoc DL, 247 const MCInstrDesc &MCID, 248 unsigned DestReg) { 249 MachineFunction &MF = *BB.getParent(); 250 MachineInstr *MI = MF.CreateMachineInstr(MCID, DL); 251 BB.insert(I, MI); 252 return MachineInstrBuilder(MF, MI).addReg(DestReg, RegState::Define); 253 } 254 255 inline MachineInstrBuilder BuildMI(MachineBasicBlock &BB, 256 MachineBasicBlock::instr_iterator I, 257 DebugLoc DL, 258 const MCInstrDesc &MCID, 259 unsigned DestReg) { 260 MachineFunction &MF = *BB.getParent(); 261 MachineInstr *MI = MF.CreateMachineInstr(MCID, DL); 262 BB.insert(I, MI); 263 return MachineInstrBuilder(MF, MI).addReg(DestReg, RegState::Define); 264 } 265 266 inline MachineInstrBuilder BuildMI(MachineBasicBlock &BB, 267 MachineInstr *I, 268 DebugLoc DL, 269 const MCInstrDesc &MCID, 270 unsigned DestReg) { 271 if (I->isInsideBundle()) { 272 MachineBasicBlock::instr_iterator MII = I; 273 return BuildMI(BB, MII, DL, MCID, DestReg); 274 } 275 276 MachineBasicBlock::iterator MII = I; 277 return BuildMI(BB, MII, DL, MCID, DestReg); 278 } 279 280 /// BuildMI - This version of the builder inserts the newly-built 281 /// instruction before the given position in the given MachineBasicBlock, and 282 /// does NOT take a destination register. 283 /// 284 inline MachineInstrBuilder BuildMI(MachineBasicBlock &BB, 285 MachineBasicBlock::iterator I, 286 DebugLoc DL, 287 const MCInstrDesc &MCID) { 288 MachineFunction &MF = *BB.getParent(); 289 MachineInstr *MI = MF.CreateMachineInstr(MCID, DL); 290 BB.insert(I, MI); 291 return MachineInstrBuilder(MF, MI); 292 } 293 294 inline MachineInstrBuilder BuildMI(MachineBasicBlock &BB, 295 MachineBasicBlock::instr_iterator I, 296 DebugLoc DL, 297 const MCInstrDesc &MCID) { 298 MachineFunction &MF = *BB.getParent(); 299 MachineInstr *MI = MF.CreateMachineInstr(MCID, DL); 300 BB.insert(I, MI); 301 return MachineInstrBuilder(MF, MI); 302 } 303 304 inline MachineInstrBuilder BuildMI(MachineBasicBlock &BB, 305 MachineInstr *I, 306 DebugLoc DL, 307 const MCInstrDesc &MCID) { 308 if (I->isInsideBundle()) { 309 MachineBasicBlock::instr_iterator MII = I; 310 return BuildMI(BB, MII, DL, MCID); 311 } 312 313 MachineBasicBlock::iterator MII = I; 314 return BuildMI(BB, MII, DL, MCID); 315 } 316 317 /// BuildMI - This version of the builder inserts the newly-built 318 /// instruction at the end of the given MachineBasicBlock, and does NOT take a 319 /// destination register. 320 /// 321 inline MachineInstrBuilder BuildMI(MachineBasicBlock *BB, 322 DebugLoc DL, 323 const MCInstrDesc &MCID) { 324 return BuildMI(*BB, BB->end(), DL, MCID); 325 } 326 327 /// BuildMI - This version of the builder inserts the newly-built 328 /// instruction at the end of the given MachineBasicBlock, and sets up the first 329 /// operand as a destination virtual register. 330 /// 331 inline MachineInstrBuilder BuildMI(MachineBasicBlock *BB, 332 DebugLoc DL, 333 const MCInstrDesc &MCID, 334 unsigned DestReg) { 335 return BuildMI(*BB, BB->end(), DL, MCID, DestReg); 336 } 337 338 inline unsigned getDefRegState(bool B) { 339 return B ? RegState::Define : 0; 340 } 341 inline unsigned getImplRegState(bool B) { 342 return B ? RegState::Implicit : 0; 343 } 344 inline unsigned getKillRegState(bool B) { 345 return B ? RegState::Kill : 0; 346 } 347 inline unsigned getDeadRegState(bool B) { 348 return B ? RegState::Dead : 0; 349 } 350 inline unsigned getUndefRegState(bool B) { 351 return B ? RegState::Undef : 0; 352 } 353 inline unsigned getInternalReadRegState(bool B) { 354 return B ? RegState::InternalRead : 0; 355 } 356 inline unsigned getDebugRegState(bool B) { 357 return B ? RegState::Debug : 0; 358 } 359 360 361 /// Helper class for constructing bundles of MachineInstrs. 362 /// 363 /// MIBundleBuilder can create a bundle from scratch by inserting new 364 /// MachineInstrs one at a time, or it can create a bundle from a sequence of 365 /// existing MachineInstrs in a basic block. 366 class MIBundleBuilder { 367 MachineBasicBlock &MBB; 368 MachineBasicBlock::instr_iterator Begin; 369 MachineBasicBlock::instr_iterator End; 370 371 public: 372 /// Create an MIBundleBuilder that inserts instructions into a new bundle in 373 /// BB above the bundle or instruction at Pos. 374 MIBundleBuilder(MachineBasicBlock &BB, 375 MachineBasicBlock::iterator Pos) 376 : MBB(BB), Begin(Pos.getInstrIterator()), End(Begin) {} 377 378 /// Create a bundle from the sequence of instructions between B and E. 379 MIBundleBuilder(MachineBasicBlock &BB, 380 MachineBasicBlock::iterator B, 381 MachineBasicBlock::iterator E) 382 : MBB(BB), Begin(B.getInstrIterator()), End(E.getInstrIterator()) { 383 assert(B != E && "No instructions to bundle"); 384 ++B; 385 while (B != E) { 386 MachineInstr *MI = B; 387 ++B; 388 MI->bundleWithPred(); 389 } 390 } 391 392 /// Create an MIBundleBuilder representing an existing instruction or bundle 393 /// that has MI as its head. 394 explicit MIBundleBuilder(MachineInstr *MI) 395 : MBB(*MI->getParent()), Begin(MI), End(getBundleEnd(MI)) {} 396 397 /// Return a reference to the basic block containing this bundle. 398 MachineBasicBlock &getMBB() const { return MBB; } 399 400 /// Return true if no instructions have been inserted in this bundle yet. 401 /// Empty bundles aren't representable in a MachineBasicBlock. 402 bool empty() const { return Begin == End; } 403 404 /// Return an iterator to the first bundled instruction. 405 MachineBasicBlock::instr_iterator begin() const { return Begin; } 406 407 /// Return an iterator beyond the last bundled instruction. 408 MachineBasicBlock::instr_iterator end() const { return End; } 409 410 /// Insert MI into this bundle before I which must point to an instruction in 411 /// the bundle, or end(). 412 MIBundleBuilder &insert(MachineBasicBlock::instr_iterator I, 413 MachineInstr *MI) { 414 MBB.insert(I, MI); 415 if (I == Begin) { 416 if (!empty()) 417 MI->bundleWithSucc(); 418 Begin = MI; 419 return *this; 420 } 421 if (I == End) { 422 MI->bundleWithPred(); 423 return *this; 424 } 425 // MI was inserted in the middle of the bundle, so its neighbors' flags are 426 // already fine. Update MI's bundle flags manually. 427 MI->setFlag(MachineInstr::BundledPred); 428 MI->setFlag(MachineInstr::BundledSucc); 429 return *this; 430 } 431 432 /// Insert MI into MBB by prepending it to the instructions in the bundle. 433 /// MI will become the first instruction in the bundle. 434 MIBundleBuilder &prepend(MachineInstr *MI) { 435 return insert(begin(), MI); 436 } 437 438 /// Insert MI into MBB by appending it to the instructions in the bundle. 439 /// MI will become the last instruction in the bundle. 440 MIBundleBuilder &append(MachineInstr *MI) { 441 return insert(end(), MI); 442 } 443 }; 444 445 } // End llvm namespace 446 447 #endif 448
