1 //===-- CodeGen/MachineInstBuilder.h - Simplify creation of MIs -*- 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 exposes a function named BuildMI, which is useful for dramatically
11 // simplifying how MachineInstr's are created. It allows use of code like this:
13 // M = BuildMI(X86::ADDrr8, 2).addReg(argVal1).addReg(argVal2);
15 //===----------------------------------------------------------------------===//
17 #ifndef LLVM_CODEGEN_MACHINEINSTRBUILDER_H
18 #define LLVM_CODEGEN_MACHINEINSTRBUILDER_H
20 #include "llvm/CodeGen/MachineFunction.h"
21 #include "llvm/CodeGen/MachineInstrBundle.h"
22 #include "llvm/Support/ErrorHandling.h"
39 DefineNoRead = Define | Undef,
40 ImplicitDefine = Implicit | Define,
41 ImplicitKill = Implicit | Kill
45 class MachineInstrBuilder {
49 MachineInstrBuilder() : MF(nullptr), MI(nullptr) {}
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) {}
55 /// Allow automatic conversion to the machine instruction we are working on.
56 operator MachineInstr*() const { return MI; }
57 MachineInstr *operator->() const { return MI; }
58 operator MachineBasicBlock::iterator() const { return MI; }
60 /// If conversion operators fail, use this method to get the MachineInstr
62 MachineInstr *getInstr() const { return MI; }
64 /// Add a new virtual register operand.
65 const MachineInstrBuilder &addReg(unsigned RegNo, unsigned flags = 0,
66 unsigned SubReg = 0) const {
67 assert((flags & 0x1) == 0 &&
68 "Passing in 'true' to addReg is forbidden! Use enums instead.");
69 MI->addOperand(*MF, MachineOperand::CreateReg(RegNo,
70 flags & RegState::Define,
71 flags & RegState::Implicit,
72 flags & RegState::Kill,
73 flags & RegState::Dead,
74 flags & RegState::Undef,
75 flags & RegState::EarlyClobber,
77 flags & RegState::Debug,
78 flags & RegState::InternalRead));
82 /// Add a new immediate operand.
83 const MachineInstrBuilder &addImm(int64_t Val) const {
84 MI->addOperand(*MF, MachineOperand::CreateImm(Val));
88 const MachineInstrBuilder &addCImm(const ConstantInt *Val) const {
89 MI->addOperand(*MF, MachineOperand::CreateCImm(Val));
93 const MachineInstrBuilder &addFPImm(const ConstantFP *Val) const {
94 MI->addOperand(*MF, MachineOperand::CreateFPImm(Val));
98 const MachineInstrBuilder &addMBB(MachineBasicBlock *MBB,
99 unsigned char TargetFlags = 0) const {
100 MI->addOperand(*MF, MachineOperand::CreateMBB(MBB, TargetFlags));
104 const MachineInstrBuilder &addFrameIndex(int Idx) const {
105 MI->addOperand(*MF, MachineOperand::CreateFI(Idx));
109 const MachineInstrBuilder &addConstantPoolIndex(unsigned Idx,
111 unsigned char TargetFlags = 0) const {
112 MI->addOperand(*MF, MachineOperand::CreateCPI(Idx, Offset, TargetFlags));
116 const MachineInstrBuilder &addTargetIndex(unsigned Idx, int64_t Offset = 0,
117 unsigned char TargetFlags = 0) const {
118 MI->addOperand(*MF, MachineOperand::CreateTargetIndex(Idx, Offset,
123 const MachineInstrBuilder &addJumpTableIndex(unsigned Idx,
124 unsigned char TargetFlags = 0) const {
125 MI->addOperand(*MF, MachineOperand::CreateJTI(Idx, TargetFlags));
129 const MachineInstrBuilder &addGlobalAddress(const GlobalValue *GV,
131 unsigned char TargetFlags = 0) const {
132 MI->addOperand(*MF, MachineOperand::CreateGA(GV, Offset, TargetFlags));
136 const MachineInstrBuilder &addExternalSymbol(const char *FnName,
137 unsigned char TargetFlags = 0) const {
138 MI->addOperand(*MF, MachineOperand::CreateES(FnName, TargetFlags));
142 const MachineInstrBuilder &addBlockAddress(const BlockAddress *BA,
144 unsigned char TargetFlags = 0) const {
145 MI->addOperand(*MF, MachineOperand::CreateBA(BA, Offset, TargetFlags));
149 const MachineInstrBuilder &addRegMask(const uint32_t *Mask) const {
150 MI->addOperand(*MF, MachineOperand::CreateRegMask(Mask));
154 const MachineInstrBuilder &addMemOperand(MachineMemOperand *MMO) const {
155 MI->addMemOperand(*MF, MMO);
159 const MachineInstrBuilder &setMemRefs(MachineInstr::mmo_iterator b,
160 MachineInstr::mmo_iterator e) const {
161 MI->setMemRefs(b, e);
165 const MachineInstrBuilder &setMemRefs(std::pair<MachineInstr::mmo_iterator,
166 unsigned> MemOperandsRef) const {
167 MI->setMemRefs(MemOperandsRef);
171 const MachineInstrBuilder &addOperand(const MachineOperand &MO) const {
172 MI->addOperand(*MF, MO);
176 const MachineInstrBuilder &addMetadata(const MDNode *MD) const {
177 MI->addOperand(*MF, MachineOperand::CreateMetadata(MD));
178 assert((MI->isDebugValue() ? static_cast<bool>(MI->getDebugVariable())
180 "first MDNode argument of a DBG_VALUE not a variable");
184 const MachineInstrBuilder &addCFIIndex(unsigned CFIIndex) const {
185 MI->addOperand(*MF, MachineOperand::CreateCFIIndex(CFIIndex));
189 const MachineInstrBuilder &addSym(MCSymbol *Sym,
190 unsigned char TargetFlags = 0) const {
191 MI->addOperand(*MF, MachineOperand::CreateMCSymbol(Sym, TargetFlags));
195 const MachineInstrBuilder &setMIFlags(unsigned Flags) const {
200 const MachineInstrBuilder &setMIFlag(MachineInstr::MIFlag Flag) const {
205 // Add a displacement from an existing MachineOperand with an added offset.
206 const MachineInstrBuilder &addDisp(const MachineOperand &Disp, int64_t off,
207 unsigned char TargetFlags = 0) const {
208 // If caller specifies new TargetFlags then use it, otherwise the
209 // default behavior is to copy the target flags from the existing
210 // MachineOperand. This means if the caller wants to clear the
211 // target flags it needs to do so explicitly.
212 if (0 == TargetFlags)
213 TargetFlags = Disp.getTargetFlags();
215 switch (Disp.getType()) {
217 llvm_unreachable("Unhandled operand type in addDisp()");
218 case MachineOperand::MO_Immediate:
219 return addImm(Disp.getImm() + off);
220 case MachineOperand::MO_ConstantPoolIndex:
221 return addConstantPoolIndex(Disp.getIndex(), Disp.getOffset() + off,
223 case MachineOperand::MO_GlobalAddress:
224 return addGlobalAddress(Disp.getGlobal(), Disp.getOffset() + off,
229 /// Copy all the implicit operands from OtherMI onto this one.
230 const MachineInstrBuilder &
231 copyImplicitOps(const MachineInstr *OtherMI) const {
232 MI->copyImplicitOps(*MF, OtherMI);
237 /// Builder interface. Specify how to create the initial instruction itself.
238 inline MachineInstrBuilder BuildMI(MachineFunction &MF,
240 const MCInstrDesc &MCID) {
241 return MachineInstrBuilder(MF, MF.CreateMachineInstr(MCID, DL));
244 /// This version of the builder sets up the first operand as a
245 /// destination virtual register.
246 inline MachineInstrBuilder BuildMI(MachineFunction &MF,
248 const MCInstrDesc &MCID,
250 return MachineInstrBuilder(MF, MF.CreateMachineInstr(MCID, DL))
251 .addReg(DestReg, RegState::Define);
254 /// This version of the builder inserts the newly-built instruction before
255 /// the given position in the given MachineBasicBlock, and sets up the first
256 /// operand as a destination virtual register.
257 inline MachineInstrBuilder BuildMI(MachineBasicBlock &BB,
258 MachineBasicBlock::iterator I,
260 const MCInstrDesc &MCID,
262 MachineFunction &MF = *BB.getParent();
263 MachineInstr *MI = MF.CreateMachineInstr(MCID, DL);
265 return MachineInstrBuilder(MF, MI).addReg(DestReg, RegState::Define);
268 inline MachineInstrBuilder BuildMI(MachineBasicBlock &BB,
269 MachineBasicBlock::instr_iterator I,
271 const MCInstrDesc &MCID,
273 MachineFunction &MF = *BB.getParent();
274 MachineInstr *MI = MF.CreateMachineInstr(MCID, DL);
276 return MachineInstrBuilder(MF, MI).addReg(DestReg, RegState::Define);
279 inline MachineInstrBuilder BuildMI(MachineBasicBlock &BB,
282 const MCInstrDesc &MCID,
284 if (I->isInsideBundle()) {
285 MachineBasicBlock::instr_iterator MII(I);
286 return BuildMI(BB, MII, DL, MCID, DestReg);
289 MachineBasicBlock::iterator MII = I;
290 return BuildMI(BB, MII, DL, MCID, DestReg);
293 /// This version of the builder inserts the newly-built instruction before the
294 /// given position in the given MachineBasicBlock, and does NOT take a
295 /// destination register.
296 inline MachineInstrBuilder BuildMI(MachineBasicBlock &BB,
297 MachineBasicBlock::iterator I,
299 const MCInstrDesc &MCID) {
300 MachineFunction &MF = *BB.getParent();
301 MachineInstr *MI = MF.CreateMachineInstr(MCID, DL);
303 return MachineInstrBuilder(MF, MI);
306 inline MachineInstrBuilder BuildMI(MachineBasicBlock &BB,
307 MachineBasicBlock::instr_iterator I,
309 const MCInstrDesc &MCID) {
310 MachineFunction &MF = *BB.getParent();
311 MachineInstr *MI = MF.CreateMachineInstr(MCID, DL);
313 return MachineInstrBuilder(MF, MI);
316 inline MachineInstrBuilder BuildMI(MachineBasicBlock &BB,
319 const MCInstrDesc &MCID) {
320 if (I->isInsideBundle()) {
321 MachineBasicBlock::instr_iterator MII(I);
322 return BuildMI(BB, MII, DL, MCID);
325 MachineBasicBlock::iterator MII = I;
326 return BuildMI(BB, MII, DL, MCID);
329 /// This version of the builder inserts the newly-built instruction at the end
330 /// of the given MachineBasicBlock, and does NOT take a destination register.
331 inline MachineInstrBuilder BuildMI(MachineBasicBlock *BB,
333 const MCInstrDesc &MCID) {
334 return BuildMI(*BB, BB->end(), DL, MCID);
337 /// This version of the builder inserts the newly-built instruction at the
338 /// end of the given MachineBasicBlock, and sets up the first operand as a
339 /// destination virtual register.
340 inline MachineInstrBuilder BuildMI(MachineBasicBlock *BB,
342 const MCInstrDesc &MCID,
344 return BuildMI(*BB, BB->end(), DL, MCID, DestReg);
347 /// This version of the builder builds a DBG_VALUE intrinsic
348 /// for either a value in a register or a register-indirect+offset
349 /// address. The convention is that a DBG_VALUE is indirect iff the
350 /// second operand is an immediate.
351 inline MachineInstrBuilder BuildMI(MachineFunction &MF, DebugLoc DL,
352 const MCInstrDesc &MCID, bool IsIndirect,
353 unsigned Reg, unsigned Offset,
354 const MDNode *Variable, const MDNode *Expr) {
355 assert(isa<DILocalVariable>(Variable) && "not a variable");
356 assert(cast<DIExpression>(Expr)->isValid() && "not an expression");
357 assert(cast<DILocalVariable>(Variable)->isValidLocationForIntrinsic(DL) &&
358 "Expected inlined-at fields to agree");
360 return BuildMI(MF, DL, MCID)
361 .addReg(Reg, RegState::Debug)
363 .addMetadata(Variable)
366 assert(Offset == 0 && "A direct address cannot have an offset.");
367 return BuildMI(MF, DL, MCID)
368 .addReg(Reg, RegState::Debug)
369 .addReg(0U, RegState::Debug)
370 .addMetadata(Variable)
375 /// This version of the builder builds a DBG_VALUE intrinsic
376 /// for either a value in a register or a register-indirect+offset
377 /// address and inserts it at position I.
378 inline MachineInstrBuilder BuildMI(MachineBasicBlock &BB,
379 MachineBasicBlock::iterator I, DebugLoc DL,
380 const MCInstrDesc &MCID, bool IsIndirect,
381 unsigned Reg, unsigned Offset,
382 const MDNode *Variable, const MDNode *Expr) {
383 assert(isa<DILocalVariable>(Variable) && "not a variable");
384 assert(cast<DIExpression>(Expr)->isValid() && "not an expression");
385 MachineFunction &MF = *BB.getParent();
387 BuildMI(MF, DL, MCID, IsIndirect, Reg, Offset, Variable, Expr);
389 return MachineInstrBuilder(MF, MI);
393 inline unsigned getDefRegState(bool B) {
394 return B ? RegState::Define : 0;
396 inline unsigned getImplRegState(bool B) {
397 return B ? RegState::Implicit : 0;
399 inline unsigned getKillRegState(bool B) {
400 return B ? RegState::Kill : 0;
402 inline unsigned getDeadRegState(bool B) {
403 return B ? RegState::Dead : 0;
405 inline unsigned getUndefRegState(bool B) {
406 return B ? RegState::Undef : 0;
408 inline unsigned getInternalReadRegState(bool B) {
409 return B ? RegState::InternalRead : 0;
411 inline unsigned getDebugRegState(bool B) {
412 return B ? RegState::Debug : 0;
416 /// Helper class for constructing bundles of MachineInstrs.
418 /// MIBundleBuilder can create a bundle from scratch by inserting new
419 /// MachineInstrs one at a time, or it can create a bundle from a sequence of
420 /// existing MachineInstrs in a basic block.
421 class MIBundleBuilder {
422 MachineBasicBlock &MBB;
423 MachineBasicBlock::instr_iterator Begin;
424 MachineBasicBlock::instr_iterator End;
427 /// Create an MIBundleBuilder that inserts instructions into a new bundle in
428 /// BB above the bundle or instruction at Pos.
429 MIBundleBuilder(MachineBasicBlock &BB,
430 MachineBasicBlock::iterator Pos)
431 : MBB(BB), Begin(Pos.getInstrIterator()), End(Begin) {}
433 /// Create a bundle from the sequence of instructions between B and E.
434 MIBundleBuilder(MachineBasicBlock &BB,
435 MachineBasicBlock::iterator B,
436 MachineBasicBlock::iterator E)
437 : MBB(BB), Begin(B.getInstrIterator()), End(E.getInstrIterator()) {
438 assert(B != E && "No instructions to bundle");
441 MachineInstr *MI = B;
443 MI->bundleWithPred();
447 /// Create an MIBundleBuilder representing an existing instruction or bundle
448 /// that has MI as its head.
449 explicit MIBundleBuilder(MachineInstr *MI)
450 : MBB(*MI->getParent()), Begin(MI), End(getBundleEnd(MI)) {}
452 /// Return a reference to the basic block containing this bundle.
453 MachineBasicBlock &getMBB() const { return MBB; }
455 /// Return true if no instructions have been inserted in this bundle yet.
456 /// Empty bundles aren't representable in a MachineBasicBlock.
457 bool empty() const { return Begin == End; }
459 /// Return an iterator to the first bundled instruction.
460 MachineBasicBlock::instr_iterator begin() const { return Begin; }
462 /// Return an iterator beyond the last bundled instruction.
463 MachineBasicBlock::instr_iterator end() const { return End; }
465 /// Insert MI into this bundle before I which must point to an instruction in
466 /// the bundle, or end().
467 MIBundleBuilder &insert(MachineBasicBlock::instr_iterator I,
472 MI->bundleWithSucc();
473 Begin = MI->getIterator();
477 MI->bundleWithPred();
480 // MI was inserted in the middle of the bundle, so its neighbors' flags are
481 // already fine. Update MI's bundle flags manually.
482 MI->setFlag(MachineInstr::BundledPred);
483 MI->setFlag(MachineInstr::BundledSucc);
487 /// Insert MI into MBB by prepending it to the instructions in the bundle.
488 /// MI will become the first instruction in the bundle.
489 MIBundleBuilder &prepend(MachineInstr *MI) {
490 return insert(begin(), MI);
493 /// Insert MI into MBB by appending it to the instructions in the bundle.
494 /// MI will become the last instruction in the bundle.
495 MIBundleBuilder &append(MachineInstr *MI) {
496 return insert(end(), MI);
500 } // End llvm namespace