1 //===-- MachineVerifier.cpp - Machine Code Verifier -----------------------===//
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 // Pass to verify generated machine code. The following is checked:
12 // Operand counts: All explicit operands must be present.
14 // Register classes: All physical and virtual register operands must be
15 // compatible with the register class required by the instruction descriptor.
17 // Register live intervals: Registers must be defined only once, and must be
18 // defined before use.
20 // The machine code verifier is enabled from LLVMTargetMachine.cpp with the
21 // command-line option -verify-machineinstrs, or by defining the environment
22 // variable LLVM_VERIFY_MACHINEINSTRS to the name of a file that will receive
23 // the verifier errors.
24 //===----------------------------------------------------------------------===//
26 #include "llvm/Instructions.h"
27 #include "llvm/Function.h"
28 #include "llvm/CodeGen/LiveIntervalAnalysis.h"
29 #include "llvm/CodeGen/LiveVariables.h"
30 #include "llvm/CodeGen/LiveStackAnalysis.h"
31 #include "llvm/CodeGen/MachineInstrBundle.h"
32 #include "llvm/CodeGen/MachineFunctionPass.h"
33 #include "llvm/CodeGen/MachineFrameInfo.h"
34 #include "llvm/CodeGen/MachineMemOperand.h"
35 #include "llvm/CodeGen/MachineRegisterInfo.h"
36 #include "llvm/CodeGen/Passes.h"
37 #include "llvm/MC/MCAsmInfo.h"
38 #include "llvm/Target/TargetMachine.h"
39 #include "llvm/Target/TargetRegisterInfo.h"
40 #include "llvm/Target/TargetInstrInfo.h"
41 #include "llvm/ADT/DenseSet.h"
42 #include "llvm/ADT/SetOperations.h"
43 #include "llvm/ADT/SmallVector.h"
44 #include "llvm/Support/Debug.h"
45 #include "llvm/Support/ErrorHandling.h"
46 #include "llvm/Support/raw_ostream.h"
50 struct MachineVerifier {
52 MachineVerifier(Pass *pass, const char *b) :
55 OutFileName(getenv("LLVM_VERIFY_MACHINEINSTRS"))
58 bool runOnMachineFunction(MachineFunction &MF);
62 const char *const OutFileName;
64 const MachineFunction *MF;
65 const TargetMachine *TM;
66 const TargetInstrInfo *TII;
67 const TargetRegisterInfo *TRI;
68 const MachineRegisterInfo *MRI;
72 typedef SmallVector<unsigned, 16> RegVector;
73 typedef SmallVector<const uint32_t*, 4> RegMaskVector;
74 typedef DenseSet<unsigned> RegSet;
75 typedef DenseMap<unsigned, const MachineInstr*> RegMap;
77 const MachineInstr *FirstTerminator;
79 BitVector regsReserved;
80 BitVector regsAllocatable;
82 RegVector regsDefined, regsDead, regsKilled;
83 RegMaskVector regMasks;
84 RegSet regsLiveInButUnused;
88 // Add Reg and any sub-registers to RV
89 void addRegWithSubRegs(RegVector &RV, unsigned Reg) {
91 if (TargetRegisterInfo::isPhysicalRegister(Reg))
92 for (MCSubRegIterator SubRegs(Reg, TRI); SubRegs.isValid(); ++SubRegs)
93 RV.push_back(*SubRegs);
97 // Is this MBB reachable from the MF entry point?
100 // Vregs that must be live in because they are used without being
101 // defined. Map value is the user.
104 // Regs killed in MBB. They may be defined again, and will then be in both
105 // regsKilled and regsLiveOut.
108 // Regs defined in MBB and live out. Note that vregs passing through may
109 // be live out without being mentioned here.
112 // Vregs that pass through MBB untouched. This set is disjoint from
113 // regsKilled and regsLiveOut.
116 // Vregs that must pass through MBB because they are needed by a successor
117 // block. This set is disjoint from regsLiveOut.
118 RegSet vregsRequired;
120 BBInfo() : reachable(false) {}
122 // Add register to vregsPassed if it belongs there. Return true if
124 bool addPassed(unsigned Reg) {
125 if (!TargetRegisterInfo::isVirtualRegister(Reg))
127 if (regsKilled.count(Reg) || regsLiveOut.count(Reg))
129 return vregsPassed.insert(Reg).second;
132 // Same for a full set.
133 bool addPassed(const RegSet &RS) {
134 bool changed = false;
135 for (RegSet::const_iterator I = RS.begin(), E = RS.end(); I != E; ++I)
141 // Add register to vregsRequired if it belongs there. Return true if
143 bool addRequired(unsigned Reg) {
144 if (!TargetRegisterInfo::isVirtualRegister(Reg))
146 if (regsLiveOut.count(Reg))
148 return vregsRequired.insert(Reg).second;
151 // Same for a full set.
152 bool addRequired(const RegSet &RS) {
153 bool changed = false;
154 for (RegSet::const_iterator I = RS.begin(), E = RS.end(); I != E; ++I)
160 // Same for a full map.
161 bool addRequired(const RegMap &RM) {
162 bool changed = false;
163 for (RegMap::const_iterator I = RM.begin(), E = RM.end(); I != E; ++I)
164 if (addRequired(I->first))
169 // Live-out registers are either in regsLiveOut or vregsPassed.
170 bool isLiveOut(unsigned Reg) const {
171 return regsLiveOut.count(Reg) || vregsPassed.count(Reg);
175 // Extra register info per MBB.
176 DenseMap<const MachineBasicBlock*, BBInfo> MBBInfoMap;
178 bool isReserved(unsigned Reg) {
179 return Reg < regsReserved.size() && regsReserved.test(Reg);
182 bool isAllocatable(unsigned Reg) {
183 return Reg < regsAllocatable.size() && regsAllocatable.test(Reg);
186 // Analysis information if available
187 LiveVariables *LiveVars;
188 LiveIntervals *LiveInts;
189 LiveStacks *LiveStks;
190 SlotIndexes *Indexes;
192 void visitMachineFunctionBefore();
193 void visitMachineBasicBlockBefore(const MachineBasicBlock *MBB);
194 void visitMachineBundleBefore(const MachineInstr *MI);
195 void visitMachineInstrBefore(const MachineInstr *MI);
196 void visitMachineOperand(const MachineOperand *MO, unsigned MONum);
197 void visitMachineInstrAfter(const MachineInstr *MI);
198 void visitMachineBundleAfter(const MachineInstr *MI);
199 void visitMachineBasicBlockAfter(const MachineBasicBlock *MBB);
200 void visitMachineFunctionAfter();
202 void report(const char *msg, const MachineFunction *MF);
203 void report(const char *msg, const MachineBasicBlock *MBB);
204 void report(const char *msg, const MachineInstr *MI);
205 void report(const char *msg, const MachineOperand *MO, unsigned MONum);
206 void report(const char *msg, const MachineFunction *MF,
207 const LiveInterval &LI);
208 void report(const char *msg, const MachineBasicBlock *MBB,
209 const LiveInterval &LI);
211 void checkLiveness(const MachineOperand *MO, unsigned MONum);
212 void markReachable(const MachineBasicBlock *MBB);
213 void calcRegsPassed();
214 void checkPHIOps(const MachineBasicBlock *MBB);
216 void calcRegsRequired();
217 void verifyLiveVariables();
218 void verifyLiveIntervals();
219 void verifyLiveInterval(const LiveInterval&);
220 void verifyLiveIntervalValue(const LiveInterval&, VNInfo*);
221 void verifyLiveIntervalSegment(const LiveInterval&,
222 LiveInterval::const_iterator);
225 struct MachineVerifierPass : public MachineFunctionPass {
226 static char ID; // Pass ID, replacement for typeid
227 const char *const Banner;
229 MachineVerifierPass(const char *b = 0)
230 : MachineFunctionPass(ID), Banner(b) {
231 initializeMachineVerifierPassPass(*PassRegistry::getPassRegistry());
234 void getAnalysisUsage(AnalysisUsage &AU) const {
235 AU.setPreservesAll();
236 MachineFunctionPass::getAnalysisUsage(AU);
239 bool runOnMachineFunction(MachineFunction &MF) {
240 MF.verify(this, Banner);
247 char MachineVerifierPass::ID = 0;
248 INITIALIZE_PASS(MachineVerifierPass, "machineverifier",
249 "Verify generated machine code", false, false)
251 FunctionPass *llvm::createMachineVerifierPass(const char *Banner) {
252 return new MachineVerifierPass(Banner);
255 void MachineFunction::verify(Pass *p, const char *Banner) const {
256 MachineVerifier(p, Banner)
257 .runOnMachineFunction(const_cast<MachineFunction&>(*this));
260 bool MachineVerifier::runOnMachineFunction(MachineFunction &MF) {
261 raw_ostream *OutFile = 0;
263 std::string ErrorInfo;
264 OutFile = new raw_fd_ostream(OutFileName, ErrorInfo,
265 raw_fd_ostream::F_Append);
266 if (!ErrorInfo.empty()) {
267 errs() << "Error opening '" << OutFileName << "': " << ErrorInfo << '\n';
279 TM = &MF.getTarget();
280 TII = TM->getInstrInfo();
281 TRI = TM->getRegisterInfo();
282 MRI = &MF.getRegInfo();
289 LiveInts = PASS->getAnalysisIfAvailable<LiveIntervals>();
290 // We don't want to verify LiveVariables if LiveIntervals is available.
292 LiveVars = PASS->getAnalysisIfAvailable<LiveVariables>();
293 LiveStks = PASS->getAnalysisIfAvailable<LiveStacks>();
294 Indexes = PASS->getAnalysisIfAvailable<SlotIndexes>();
297 visitMachineFunctionBefore();
298 for (MachineFunction::const_iterator MFI = MF.begin(), MFE = MF.end();
300 visitMachineBasicBlockBefore(MFI);
301 // Keep track of the current bundle header.
302 const MachineInstr *CurBundle = 0;
303 for (MachineBasicBlock::const_instr_iterator MBBI = MFI->instr_begin(),
304 MBBE = MFI->instr_end(); MBBI != MBBE; ++MBBI) {
305 if (MBBI->getParent() != MFI) {
306 report("Bad instruction parent pointer", MFI);
307 *OS << "Instruction: " << *MBBI;
310 // Is this a bundle header?
311 if (!MBBI->isInsideBundle()) {
313 visitMachineBundleAfter(CurBundle);
315 visitMachineBundleBefore(CurBundle);
316 } else if (!CurBundle)
317 report("No bundle header", MBBI);
318 visitMachineInstrBefore(MBBI);
319 for (unsigned I = 0, E = MBBI->getNumOperands(); I != E; ++I)
320 visitMachineOperand(&MBBI->getOperand(I), I);
321 visitMachineInstrAfter(MBBI);
324 visitMachineBundleAfter(CurBundle);
325 visitMachineBasicBlockAfter(MFI);
327 visitMachineFunctionAfter();
331 else if (foundErrors)
332 report_fatal_error("Found "+Twine(foundErrors)+" machine code errors.");
340 regsLiveInButUnused.clear();
343 return false; // no changes
346 void MachineVerifier::report(const char *msg, const MachineFunction *MF) {
349 if (!foundErrors++) {
351 *OS << "# " << Banner << '\n';
352 MF->print(*OS, Indexes);
354 *OS << "*** Bad machine code: " << msg << " ***\n"
355 << "- function: " << MF->getFunction()->getName() << "\n";
358 void MachineVerifier::report(const char *msg, const MachineBasicBlock *MBB) {
360 report(msg, MBB->getParent());
361 *OS << "- basic block: BB#" << MBB->getNumber()
362 << ' ' << MBB->getName()
363 << " (" << (void*)MBB << ')';
365 *OS << " [" << Indexes->getMBBStartIdx(MBB)
366 << ';' << Indexes->getMBBEndIdx(MBB) << ')';
370 void MachineVerifier::report(const char *msg, const MachineInstr *MI) {
372 report(msg, MI->getParent());
373 *OS << "- instruction: ";
374 if (Indexes && Indexes->hasIndex(MI))
375 *OS << Indexes->getInstructionIndex(MI) << '\t';
379 void MachineVerifier::report(const char *msg,
380 const MachineOperand *MO, unsigned MONum) {
382 report(msg, MO->getParent());
383 *OS << "- operand " << MONum << ": ";
388 void MachineVerifier::report(const char *msg, const MachineFunction *MF,
389 const LiveInterval &LI) {
391 *OS << "- interval: ";
392 if (TargetRegisterInfo::isVirtualRegister(LI.reg))
393 *OS << PrintReg(LI.reg, TRI);
395 *OS << PrintRegUnit(LI.reg, TRI);
396 *OS << ' ' << LI << '\n';
399 void MachineVerifier::report(const char *msg, const MachineBasicBlock *MBB,
400 const LiveInterval &LI) {
402 *OS << "- interval: ";
403 if (TargetRegisterInfo::isVirtualRegister(LI.reg))
404 *OS << PrintReg(LI.reg, TRI);
406 *OS << PrintRegUnit(LI.reg, TRI);
407 *OS << ' ' << LI << '\n';
410 void MachineVerifier::markReachable(const MachineBasicBlock *MBB) {
411 BBInfo &MInfo = MBBInfoMap[MBB];
412 if (!MInfo.reachable) {
413 MInfo.reachable = true;
414 for (MachineBasicBlock::const_succ_iterator SuI = MBB->succ_begin(),
415 SuE = MBB->succ_end(); SuI != SuE; ++SuI)
420 void MachineVerifier::visitMachineFunctionBefore() {
421 lastIndex = SlotIndex();
422 regsReserved = TRI->getReservedRegs(*MF);
424 // A sub-register of a reserved register is also reserved
425 for (int Reg = regsReserved.find_first(); Reg>=0;
426 Reg = regsReserved.find_next(Reg)) {
427 for (MCSubRegIterator SubRegs(Reg, TRI); SubRegs.isValid(); ++SubRegs) {
428 // FIXME: This should probably be:
429 // assert(regsReserved.test(*SubRegs) && "Non-reserved sub-register");
430 regsReserved.set(*SubRegs);
434 regsAllocatable = TRI->getAllocatableSet(*MF);
436 markReachable(&MF->front());
439 // Does iterator point to a and b as the first two elements?
440 static bool matchPair(MachineBasicBlock::const_succ_iterator i,
441 const MachineBasicBlock *a, const MachineBasicBlock *b) {
450 MachineVerifier::visitMachineBasicBlockBefore(const MachineBasicBlock *MBB) {
454 // If this block has allocatable physical registers live-in, check that
455 // it is an entry block or landing pad.
456 for (MachineBasicBlock::livein_iterator LI = MBB->livein_begin(),
457 LE = MBB->livein_end();
460 if (isAllocatable(reg) && !MBB->isLandingPad() &&
461 MBB != MBB->getParent()->begin()) {
462 report("MBB has allocable live-in, but isn't entry or landing-pad.", MBB);
467 // Count the number of landing pad successors.
468 SmallPtrSet<MachineBasicBlock*, 4> LandingPadSuccs;
469 for (MachineBasicBlock::const_succ_iterator I = MBB->succ_begin(),
470 E = MBB->succ_end(); I != E; ++I) {
471 if ((*I)->isLandingPad())
472 LandingPadSuccs.insert(*I);
475 const MCAsmInfo *AsmInfo = TM->getMCAsmInfo();
476 const BasicBlock *BB = MBB->getBasicBlock();
477 if (LandingPadSuccs.size() > 1 &&
479 AsmInfo->getExceptionHandlingType() == ExceptionHandling::SjLj &&
480 BB && isa<SwitchInst>(BB->getTerminator())))
481 report("MBB has more than one landing pad successor", MBB);
483 // Call AnalyzeBranch. If it succeeds, there several more conditions to check.
484 MachineBasicBlock *TBB = 0, *FBB = 0;
485 SmallVector<MachineOperand, 4> Cond;
486 if (!TII->AnalyzeBranch(*const_cast<MachineBasicBlock *>(MBB),
488 // Ok, AnalyzeBranch thinks it knows what's going on with this block. Let's
489 // check whether its answers match up with reality.
491 // Block falls through to its successor.
492 MachineFunction::const_iterator MBBI = MBB;
494 if (MBBI == MF->end()) {
495 // It's possible that the block legitimately ends with a noreturn
496 // call or an unreachable, in which case it won't actually fall
497 // out the bottom of the function.
498 } else if (MBB->succ_size() == LandingPadSuccs.size()) {
499 // It's possible that the block legitimately ends with a noreturn
500 // call or an unreachable, in which case it won't actuall fall
502 } else if (MBB->succ_size() != 1+LandingPadSuccs.size()) {
503 report("MBB exits via unconditional fall-through but doesn't have "
504 "exactly one CFG successor!", MBB);
505 } else if (!MBB->isSuccessor(MBBI)) {
506 report("MBB exits via unconditional fall-through but its successor "
507 "differs from its CFG successor!", MBB);
509 if (!MBB->empty() && getBundleStart(&MBB->back())->isBarrier() &&
510 !TII->isPredicated(getBundleStart(&MBB->back()))) {
511 report("MBB exits via unconditional fall-through but ends with a "
512 "barrier instruction!", MBB);
515 report("MBB exits via unconditional fall-through but has a condition!",
518 } else if (TBB && !FBB && Cond.empty()) {
519 // Block unconditionally branches somewhere.
520 if (MBB->succ_size() != 1+LandingPadSuccs.size()) {
521 report("MBB exits via unconditional branch but doesn't have "
522 "exactly one CFG successor!", MBB);
523 } else if (!MBB->isSuccessor(TBB)) {
524 report("MBB exits via unconditional branch but the CFG "
525 "successor doesn't match the actual successor!", MBB);
528 report("MBB exits via unconditional branch but doesn't contain "
529 "any instructions!", MBB);
530 } else if (!getBundleStart(&MBB->back())->isBarrier()) {
531 report("MBB exits via unconditional branch but doesn't end with a "
532 "barrier instruction!", MBB);
533 } else if (!getBundleStart(&MBB->back())->isTerminator()) {
534 report("MBB exits via unconditional branch but the branch isn't a "
535 "terminator instruction!", MBB);
537 } else if (TBB && !FBB && !Cond.empty()) {
538 // Block conditionally branches somewhere, otherwise falls through.
539 MachineFunction::const_iterator MBBI = MBB;
541 if (MBBI == MF->end()) {
542 report("MBB conditionally falls through out of function!", MBB);
543 } if (MBB->succ_size() != 2) {
544 report("MBB exits via conditional branch/fall-through but doesn't have "
545 "exactly two CFG successors!", MBB);
546 } else if (!matchPair(MBB->succ_begin(), TBB, MBBI)) {
547 report("MBB exits via conditional branch/fall-through but the CFG "
548 "successors don't match the actual successors!", MBB);
551 report("MBB exits via conditional branch/fall-through but doesn't "
552 "contain any instructions!", MBB);
553 } else if (getBundleStart(&MBB->back())->isBarrier()) {
554 report("MBB exits via conditional branch/fall-through but ends with a "
555 "barrier instruction!", MBB);
556 } else if (!getBundleStart(&MBB->back())->isTerminator()) {
557 report("MBB exits via conditional branch/fall-through but the branch "
558 "isn't a terminator instruction!", MBB);
560 } else if (TBB && FBB) {
561 // Block conditionally branches somewhere, otherwise branches
563 if (MBB->succ_size() != 2) {
564 report("MBB exits via conditional branch/branch but doesn't have "
565 "exactly two CFG successors!", MBB);
566 } else if (!matchPair(MBB->succ_begin(), TBB, FBB)) {
567 report("MBB exits via conditional branch/branch but the CFG "
568 "successors don't match the actual successors!", MBB);
571 report("MBB exits via conditional branch/branch but doesn't "
572 "contain any instructions!", MBB);
573 } else if (!getBundleStart(&MBB->back())->isBarrier()) {
574 report("MBB exits via conditional branch/branch but doesn't end with a "
575 "barrier instruction!", MBB);
576 } else if (!getBundleStart(&MBB->back())->isTerminator()) {
577 report("MBB exits via conditional branch/branch but the branch "
578 "isn't a terminator instruction!", MBB);
581 report("MBB exits via conditinal branch/branch but there's no "
585 report("AnalyzeBranch returned invalid data!", MBB);
590 for (MachineBasicBlock::livein_iterator I = MBB->livein_begin(),
591 E = MBB->livein_end(); I != E; ++I) {
592 if (!TargetRegisterInfo::isPhysicalRegister(*I)) {
593 report("MBB live-in list contains non-physical register", MBB);
597 for (MCSubRegIterator SubRegs(*I, TRI); SubRegs.isValid(); ++SubRegs)
598 regsLive.insert(*SubRegs);
600 regsLiveInButUnused = regsLive;
602 const MachineFrameInfo *MFI = MF->getFrameInfo();
603 assert(MFI && "Function has no frame info");
604 BitVector PR = MFI->getPristineRegs(MBB);
605 for (int I = PR.find_first(); I>0; I = PR.find_next(I)) {
607 for (MCSubRegIterator SubRegs(I, TRI); SubRegs.isValid(); ++SubRegs)
608 regsLive.insert(*SubRegs);
615 lastIndex = Indexes->getMBBStartIdx(MBB);
618 // This function gets called for all bundle headers, including normal
619 // stand-alone unbundled instructions.
620 void MachineVerifier::visitMachineBundleBefore(const MachineInstr *MI) {
621 if (Indexes && Indexes->hasIndex(MI)) {
622 SlotIndex idx = Indexes->getInstructionIndex(MI);
623 if (!(idx > lastIndex)) {
624 report("Instruction index out of order", MI);
625 *OS << "Last instruction was at " << lastIndex << '\n';
630 // Ensure non-terminators don't follow terminators.
631 // Ignore predicated terminators formed by if conversion.
632 // FIXME: If conversion shouldn't need to violate this rule.
633 if (MI->isTerminator() && !TII->isPredicated(MI)) {
634 if (!FirstTerminator)
635 FirstTerminator = MI;
636 } else if (FirstTerminator) {
637 report("Non-terminator instruction after the first terminator", MI);
638 *OS << "First terminator was:\t" << *FirstTerminator;
642 void MachineVerifier::visitMachineInstrBefore(const MachineInstr *MI) {
643 const MCInstrDesc &MCID = MI->getDesc();
644 if (MI->getNumOperands() < MCID.getNumOperands()) {
645 report("Too few operands", MI);
646 *OS << MCID.getNumOperands() << " operands expected, but "
647 << MI->getNumExplicitOperands() << " given.\n";
650 // Check the MachineMemOperands for basic consistency.
651 for (MachineInstr::mmo_iterator I = MI->memoperands_begin(),
652 E = MI->memoperands_end(); I != E; ++I) {
653 if ((*I)->isLoad() && !MI->mayLoad())
654 report("Missing mayLoad flag", MI);
655 if ((*I)->isStore() && !MI->mayStore())
656 report("Missing mayStore flag", MI);
659 // Debug values must not have a slot index.
660 // Other instructions must have one, unless they are inside a bundle.
662 bool mapped = !LiveInts->isNotInMIMap(MI);
663 if (MI->isDebugValue()) {
665 report("Debug instruction has a slot index", MI);
666 } else if (MI->isInsideBundle()) {
668 report("Instruction inside bundle has a slot index", MI);
671 report("Missing slot index", MI);
676 if (!TII->verifyInstruction(MI, ErrorInfo))
677 report(ErrorInfo.data(), MI);
681 MachineVerifier::visitMachineOperand(const MachineOperand *MO, unsigned MONum) {
682 const MachineInstr *MI = MO->getParent();
683 const MCInstrDesc &MCID = MI->getDesc();
685 // The first MCID.NumDefs operands must be explicit register defines
686 if (MONum < MCID.getNumDefs()) {
687 const MCOperandInfo &MCOI = MCID.OpInfo[MONum];
689 report("Explicit definition must be a register", MO, MONum);
690 else if (!MO->isDef() && !MCOI.isOptionalDef())
691 report("Explicit definition marked as use", MO, MONum);
692 else if (MO->isImplicit())
693 report("Explicit definition marked as implicit", MO, MONum);
694 } else if (MONum < MCID.getNumOperands()) {
695 const MCOperandInfo &MCOI = MCID.OpInfo[MONum];
696 // Don't check if it's the last operand in a variadic instruction. See,
697 // e.g., LDM_RET in the arm back end.
699 !(MI->isVariadic() && MONum == MCID.getNumOperands()-1)) {
700 if (MO->isDef() && !MCOI.isOptionalDef())
701 report("Explicit operand marked as def", MO, MONum);
702 if (MO->isImplicit())
703 report("Explicit operand marked as implicit", MO, MONum);
706 // ARM adds %reg0 operands to indicate predicates. We'll allow that.
707 if (MO->isReg() && !MO->isImplicit() && !MI->isVariadic() && MO->getReg())
708 report("Extra explicit operand on non-variadic instruction", MO, MONum);
711 switch (MO->getType()) {
712 case MachineOperand::MO_Register: {
713 const unsigned Reg = MO->getReg();
716 if (MRI->tracksLiveness() && !MI->isDebugValue())
717 checkLiveness(MO, MONum);
719 // Verify two-address constraints after leaving SSA form.
721 if (!MRI->isSSA() && MO->isUse() &&
722 MI->isRegTiedToDefOperand(MONum, &DefIdx) &&
723 Reg != MI->getOperand(DefIdx).getReg())
724 report("Two-address instruction operands must be identical", MO, MONum);
726 // Check register classes.
727 if (MONum < MCID.getNumOperands() && !MO->isImplicit()) {
728 unsigned SubIdx = MO->getSubReg();
730 if (TargetRegisterInfo::isPhysicalRegister(Reg)) {
732 report("Illegal subregister index for physical register", MO, MONum);
735 if (const TargetRegisterClass *DRC =
736 TII->getRegClass(MCID, MONum, TRI, *MF)) {
737 if (!DRC->contains(Reg)) {
738 report("Illegal physical register for instruction", MO, MONum);
739 *OS << TRI->getName(Reg) << " is not a "
740 << DRC->getName() << " register.\n";
745 const TargetRegisterClass *RC = MRI->getRegClass(Reg);
747 const TargetRegisterClass *SRC =
748 TRI->getSubClassWithSubReg(RC, SubIdx);
750 report("Invalid subregister index for virtual register", MO, MONum);
751 *OS << "Register class " << RC->getName()
752 << " does not support subreg index " << SubIdx << "\n";
756 report("Invalid register class for subregister index", MO, MONum);
757 *OS << "Register class " << RC->getName()
758 << " does not fully support subreg index " << SubIdx << "\n";
762 if (const TargetRegisterClass *DRC =
763 TII->getRegClass(MCID, MONum, TRI, *MF)) {
765 const TargetRegisterClass *SuperRC =
766 TRI->getLargestLegalSuperClass(RC);
768 report("No largest legal super class exists.", MO, MONum);
771 DRC = TRI->getMatchingSuperRegClass(SuperRC, DRC, SubIdx);
773 report("No matching super-reg register class.", MO, MONum);
777 if (!RC->hasSuperClassEq(DRC)) {
778 report("Illegal virtual register for instruction", MO, MONum);
779 *OS << "Expected a " << DRC->getName() << " register, but got a "
780 << RC->getName() << " register\n";
788 case MachineOperand::MO_RegisterMask:
789 regMasks.push_back(MO->getRegMask());
792 case MachineOperand::MO_MachineBasicBlock:
793 if (MI->isPHI() && !MO->getMBB()->isSuccessor(MI->getParent()))
794 report("PHI operand is not in the CFG", MO, MONum);
797 case MachineOperand::MO_FrameIndex:
798 if (LiveStks && LiveStks->hasInterval(MO->getIndex()) &&
799 LiveInts && !LiveInts->isNotInMIMap(MI)) {
800 LiveInterval &LI = LiveStks->getInterval(MO->getIndex());
801 SlotIndex Idx = LiveInts->getInstructionIndex(MI);
802 if (MI->mayLoad() && !LI.liveAt(Idx.getRegSlot(true))) {
803 report("Instruction loads from dead spill slot", MO, MONum);
804 *OS << "Live stack: " << LI << '\n';
806 if (MI->mayStore() && !LI.liveAt(Idx.getRegSlot())) {
807 report("Instruction stores to dead spill slot", MO, MONum);
808 *OS << "Live stack: " << LI << '\n';
818 void MachineVerifier::checkLiveness(const MachineOperand *MO, unsigned MONum) {
819 const MachineInstr *MI = MO->getParent();
820 const unsigned Reg = MO->getReg();
822 // Both use and def operands can read a register.
823 if (MO->readsReg()) {
824 regsLiveInButUnused.erase(Reg);
827 addRegWithSubRegs(regsKilled, Reg);
829 // Check that LiveVars knows this kill.
830 if (LiveVars && TargetRegisterInfo::isVirtualRegister(Reg) &&
832 LiveVariables::VarInfo &VI = LiveVars->getVarInfo(Reg);
833 if (std::find(VI.Kills.begin(), VI.Kills.end(), MI) == VI.Kills.end())
834 report("Kill missing from LiveVariables", MO, MONum);
837 // Check LiveInts liveness and kill.
838 if (LiveInts && !LiveInts->isNotInMIMap(MI)) {
839 SlotIndex UseIdx = LiveInts->getInstructionIndex(MI);
840 // Check the cached regunit intervals.
841 if (TargetRegisterInfo::isPhysicalRegister(Reg) && !isReserved(Reg)) {
842 for (MCRegUnitIterator Units(Reg, TRI); Units.isValid(); ++Units) {
843 if (const LiveInterval *LI = LiveInts->getCachedRegUnit(*Units)) {
844 LiveRangeQuery LRQ(*LI, UseIdx);
845 if (!LRQ.valueIn()) {
846 report("No live range at use", MO, MONum);
847 *OS << UseIdx << " is not live in " << PrintRegUnit(*Units, TRI)
848 << ' ' << *LI << '\n';
850 if (MO->isKill() && !LRQ.isKill()) {
851 report("Live range continues after kill flag", MO, MONum);
852 *OS << PrintRegUnit(*Units, TRI) << ' ' << *LI << '\n';
858 if (TargetRegisterInfo::isVirtualRegister(Reg)) {
859 if (LiveInts->hasInterval(Reg)) {
860 // This is a virtual register interval.
861 const LiveInterval &LI = LiveInts->getInterval(Reg);
862 LiveRangeQuery LRQ(LI, UseIdx);
863 if (!LRQ.valueIn()) {
864 report("No live range at use", MO, MONum);
865 *OS << UseIdx << " is not live in " << LI << '\n';
867 // Check for extra kill flags.
868 // Note that we allow missing kill flags for now.
869 if (MO->isKill() && !LRQ.isKill()) {
870 report("Live range continues after kill flag", MO, MONum);
871 *OS << "Live range: " << LI << '\n';
874 report("Virtual register has no live interval", MO, MONum);
879 // Use of a dead register.
880 if (!regsLive.count(Reg)) {
881 if (TargetRegisterInfo::isPhysicalRegister(Reg)) {
882 // Reserved registers may be used even when 'dead'.
883 if (!isReserved(Reg))
884 report("Using an undefined physical register", MO, MONum);
885 } else if (MRI->def_empty(Reg)) {
886 report("Reading virtual register without a def", MO, MONum);
888 BBInfo &MInfo = MBBInfoMap[MI->getParent()];
889 // We don't know which virtual registers are live in, so only complain
890 // if vreg was killed in this MBB. Otherwise keep track of vregs that
891 // must be live in. PHI instructions are handled separately.
892 if (MInfo.regsKilled.count(Reg))
893 report("Using a killed virtual register", MO, MONum);
894 else if (!MI->isPHI())
895 MInfo.vregsLiveIn.insert(std::make_pair(Reg, MI));
902 // TODO: verify that earlyclobber ops are not used.
904 addRegWithSubRegs(regsDead, Reg);
906 addRegWithSubRegs(regsDefined, Reg);
909 if (MRI->isSSA() && TargetRegisterInfo::isVirtualRegister(Reg) &&
910 llvm::next(MRI->def_begin(Reg)) != MRI->def_end())
911 report("Multiple virtual register defs in SSA form", MO, MONum);
913 // Check LiveInts for a live range, but only for virtual registers.
914 if (LiveInts && TargetRegisterInfo::isVirtualRegister(Reg) &&
915 !LiveInts->isNotInMIMap(MI)) {
916 SlotIndex DefIdx = LiveInts->getInstructionIndex(MI);
917 DefIdx = DefIdx.getRegSlot(MO->isEarlyClobber());
918 if (LiveInts->hasInterval(Reg)) {
919 const LiveInterval &LI = LiveInts->getInterval(Reg);
920 if (const VNInfo *VNI = LI.getVNInfoAt(DefIdx)) {
921 assert(VNI && "NULL valno is not allowed");
922 if (VNI->def != DefIdx) {
923 report("Inconsistent valno->def", MO, MONum);
924 *OS << "Valno " << VNI->id << " is not defined at "
925 << DefIdx << " in " << LI << '\n';
928 report("No live range at def", MO, MONum);
929 *OS << DefIdx << " is not live in " << LI << '\n';
932 report("Virtual register has no Live interval", MO, MONum);
938 void MachineVerifier::visitMachineInstrAfter(const MachineInstr *MI) {
941 // This function gets called after visiting all instructions in a bundle. The
942 // argument points to the bundle header.
943 // Normal stand-alone instructions are also considered 'bundles', and this
944 // function is called for all of them.
945 void MachineVerifier::visitMachineBundleAfter(const MachineInstr *MI) {
946 BBInfo &MInfo = MBBInfoMap[MI->getParent()];
947 set_union(MInfo.regsKilled, regsKilled);
948 set_subtract(regsLive, regsKilled); regsKilled.clear();
949 // Kill any masked registers.
950 while (!regMasks.empty()) {
951 const uint32_t *Mask = regMasks.pop_back_val();
952 for (RegSet::iterator I = regsLive.begin(), E = regsLive.end(); I != E; ++I)
953 if (TargetRegisterInfo::isPhysicalRegister(*I) &&
954 MachineOperand::clobbersPhysReg(Mask, *I))
955 regsDead.push_back(*I);
957 set_subtract(regsLive, regsDead); regsDead.clear();
958 set_union(regsLive, regsDefined); regsDefined.clear();
962 MachineVerifier::visitMachineBasicBlockAfter(const MachineBasicBlock *MBB) {
963 MBBInfoMap[MBB].regsLiveOut = regsLive;
967 SlotIndex stop = Indexes->getMBBEndIdx(MBB);
968 if (!(stop > lastIndex)) {
969 report("Block ends before last instruction index", MBB);
970 *OS << "Block ends at " << stop
971 << " last instruction was at " << lastIndex << '\n';
977 // Calculate the largest possible vregsPassed sets. These are the registers that
978 // can pass through an MBB live, but may not be live every time. It is assumed
979 // that all vregsPassed sets are empty before the call.
980 void MachineVerifier::calcRegsPassed() {
981 // First push live-out regs to successors' vregsPassed. Remember the MBBs that
982 // have any vregsPassed.
983 SmallPtrSet<const MachineBasicBlock*, 8> todo;
984 for (MachineFunction::const_iterator MFI = MF->begin(), MFE = MF->end();
986 const MachineBasicBlock &MBB(*MFI);
987 BBInfo &MInfo = MBBInfoMap[&MBB];
988 if (!MInfo.reachable)
990 for (MachineBasicBlock::const_succ_iterator SuI = MBB.succ_begin(),
991 SuE = MBB.succ_end(); SuI != SuE; ++SuI) {
992 BBInfo &SInfo = MBBInfoMap[*SuI];
993 if (SInfo.addPassed(MInfo.regsLiveOut))
998 // Iteratively push vregsPassed to successors. This will converge to the same
999 // final state regardless of DenseSet iteration order.
1000 while (!todo.empty()) {
1001 const MachineBasicBlock *MBB = *todo.begin();
1003 BBInfo &MInfo = MBBInfoMap[MBB];
1004 for (MachineBasicBlock::const_succ_iterator SuI = MBB->succ_begin(),
1005 SuE = MBB->succ_end(); SuI != SuE; ++SuI) {
1008 BBInfo &SInfo = MBBInfoMap[*SuI];
1009 if (SInfo.addPassed(MInfo.vregsPassed))
1015 // Calculate the set of virtual registers that must be passed through each basic
1016 // block in order to satisfy the requirements of successor blocks. This is very
1017 // similar to calcRegsPassed, only backwards.
1018 void MachineVerifier::calcRegsRequired() {
1019 // First push live-in regs to predecessors' vregsRequired.
1020 SmallPtrSet<const MachineBasicBlock*, 8> todo;
1021 for (MachineFunction::const_iterator MFI = MF->begin(), MFE = MF->end();
1022 MFI != MFE; ++MFI) {
1023 const MachineBasicBlock &MBB(*MFI);
1024 BBInfo &MInfo = MBBInfoMap[&MBB];
1025 for (MachineBasicBlock::const_pred_iterator PrI = MBB.pred_begin(),
1026 PrE = MBB.pred_end(); PrI != PrE; ++PrI) {
1027 BBInfo &PInfo = MBBInfoMap[*PrI];
1028 if (PInfo.addRequired(MInfo.vregsLiveIn))
1033 // Iteratively push vregsRequired to predecessors. This will converge to the
1034 // same final state regardless of DenseSet iteration order.
1035 while (!todo.empty()) {
1036 const MachineBasicBlock *MBB = *todo.begin();
1038 BBInfo &MInfo = MBBInfoMap[MBB];
1039 for (MachineBasicBlock::const_pred_iterator PrI = MBB->pred_begin(),
1040 PrE = MBB->pred_end(); PrI != PrE; ++PrI) {
1043 BBInfo &SInfo = MBBInfoMap[*PrI];
1044 if (SInfo.addRequired(MInfo.vregsRequired))
1050 // Check PHI instructions at the beginning of MBB. It is assumed that
1051 // calcRegsPassed has been run so BBInfo::isLiveOut is valid.
1052 void MachineVerifier::checkPHIOps(const MachineBasicBlock *MBB) {
1053 SmallPtrSet<const MachineBasicBlock*, 8> seen;
1054 for (MachineBasicBlock::const_iterator BBI = MBB->begin(), BBE = MBB->end();
1055 BBI != BBE && BBI->isPHI(); ++BBI) {
1058 for (unsigned i = 1, e = BBI->getNumOperands(); i != e; i += 2) {
1059 unsigned Reg = BBI->getOperand(i).getReg();
1060 const MachineBasicBlock *Pre = BBI->getOperand(i + 1).getMBB();
1061 if (!Pre->isSuccessor(MBB))
1064 BBInfo &PrInfo = MBBInfoMap[Pre];
1065 if (PrInfo.reachable && !PrInfo.isLiveOut(Reg))
1066 report("PHI operand is not live-out from predecessor",
1067 &BBI->getOperand(i), i);
1070 // Did we see all predecessors?
1071 for (MachineBasicBlock::const_pred_iterator PrI = MBB->pred_begin(),
1072 PrE = MBB->pred_end(); PrI != PrE; ++PrI) {
1073 if (!seen.count(*PrI)) {
1074 report("Missing PHI operand", BBI);
1075 *OS << "BB#" << (*PrI)->getNumber()
1076 << " is a predecessor according to the CFG.\n";
1082 void MachineVerifier::visitMachineFunctionAfter() {
1085 for (MachineFunction::const_iterator MFI = MF->begin(), MFE = MF->end();
1086 MFI != MFE; ++MFI) {
1087 BBInfo &MInfo = MBBInfoMap[MFI];
1089 // Skip unreachable MBBs.
1090 if (!MInfo.reachable)
1096 // Now check liveness info if available
1099 // Check for killed virtual registers that should be live out.
1100 for (MachineFunction::const_iterator MFI = MF->begin(), MFE = MF->end();
1101 MFI != MFE; ++MFI) {
1102 BBInfo &MInfo = MBBInfoMap[MFI];
1103 for (RegSet::iterator
1104 I = MInfo.vregsRequired.begin(), E = MInfo.vregsRequired.end(); I != E;
1106 if (MInfo.regsKilled.count(*I)) {
1107 report("Virtual register killed in block, but needed live out.", MFI);
1108 *OS << "Virtual register " << PrintReg(*I)
1109 << " is used after the block.\n";
1114 BBInfo &MInfo = MBBInfoMap[&MF->front()];
1115 for (RegSet::iterator
1116 I = MInfo.vregsRequired.begin(), E = MInfo.vregsRequired.end(); I != E;
1118 report("Virtual register def doesn't dominate all uses.",
1119 MRI->getVRegDef(*I));
1123 verifyLiveVariables();
1125 verifyLiveIntervals();
1128 void MachineVerifier::verifyLiveVariables() {
1129 assert(LiveVars && "Don't call verifyLiveVariables without LiveVars");
1130 for (unsigned i = 0, e = MRI->getNumVirtRegs(); i != e; ++i) {
1131 unsigned Reg = TargetRegisterInfo::index2VirtReg(i);
1132 LiveVariables::VarInfo &VI = LiveVars->getVarInfo(Reg);
1133 for (MachineFunction::const_iterator MFI = MF->begin(), MFE = MF->end();
1134 MFI != MFE; ++MFI) {
1135 BBInfo &MInfo = MBBInfoMap[MFI];
1137 // Our vregsRequired should be identical to LiveVariables' AliveBlocks
1138 if (MInfo.vregsRequired.count(Reg)) {
1139 if (!VI.AliveBlocks.test(MFI->getNumber())) {
1140 report("LiveVariables: Block missing from AliveBlocks", MFI);
1141 *OS << "Virtual register " << PrintReg(Reg)
1142 << " must be live through the block.\n";
1145 if (VI.AliveBlocks.test(MFI->getNumber())) {
1146 report("LiveVariables: Block should not be in AliveBlocks", MFI);
1147 *OS << "Virtual register " << PrintReg(Reg)
1148 << " is not needed live through the block.\n";
1155 void MachineVerifier::verifyLiveIntervals() {
1156 assert(LiveInts && "Don't call verifyLiveIntervals without LiveInts");
1157 for (unsigned i = 0, e = MRI->getNumVirtRegs(); i != e; ++i) {
1158 unsigned Reg = TargetRegisterInfo::index2VirtReg(i);
1160 // Spilling and splitting may leave unused registers around. Skip them.
1161 if (MRI->reg_nodbg_empty(Reg))
1164 if (!LiveInts->hasInterval(Reg)) {
1165 report("Missing live interval for virtual register", MF);
1166 *OS << PrintReg(Reg, TRI) << " still has defs or uses\n";
1170 const LiveInterval &LI = LiveInts->getInterval(Reg);
1171 assert(Reg == LI.reg && "Invalid reg to interval mapping");
1172 verifyLiveInterval(LI);
1175 // Verify all the cached regunit intervals.
1176 for (unsigned i = 0, e = TRI->getNumRegUnits(); i != e; ++i)
1177 if (const LiveInterval *LI = LiveInts->getCachedRegUnit(i))
1178 verifyLiveInterval(*LI);
1181 void MachineVerifier::verifyLiveIntervalValue(const LiveInterval &LI,
1183 if (VNI->isUnused())
1186 const VNInfo *DefVNI = LI.getVNInfoAt(VNI->def);
1189 report("Valno not live at def and not marked unused", MF, LI);
1190 *OS << "Valno #" << VNI->id << '\n';
1194 if (DefVNI != VNI) {
1195 report("Live range at def has different valno", MF, LI);
1196 *OS << "Valno #" << VNI->id << " is defined at " << VNI->def
1197 << " where valno #" << DefVNI->id << " is live\n";
1201 const MachineBasicBlock *MBB = LiveInts->getMBBFromIndex(VNI->def);
1203 report("Invalid definition index", MF, LI);
1204 *OS << "Valno #" << VNI->id << " is defined at " << VNI->def
1205 << " in " << LI << '\n';
1209 if (VNI->isPHIDef()) {
1210 if (VNI->def != LiveInts->getMBBStartIdx(MBB)) {
1211 report("PHIDef value is not defined at MBB start", MBB, LI);
1212 *OS << "Valno #" << VNI->id << " is defined at " << VNI->def
1213 << ", not at the beginning of BB#" << MBB->getNumber() << '\n';
1219 const MachineInstr *MI = LiveInts->getInstructionFromIndex(VNI->def);
1221 report("No instruction at def index", MBB, LI);
1222 *OS << "Valno #" << VNI->id << " is defined at " << VNI->def << '\n';
1226 bool hasDef = false;
1227 bool isEarlyClobber = false;
1228 for (ConstMIBundleOperands MOI(MI); MOI.isValid(); ++MOI) {
1229 if (!MOI->isReg() || !MOI->isDef())
1231 if (TargetRegisterInfo::isVirtualRegister(LI.reg)) {
1232 if (MOI->getReg() != LI.reg)
1235 if (!TargetRegisterInfo::isPhysicalRegister(MOI->getReg()) ||
1236 !TRI->hasRegUnit(MOI->getReg(), LI.reg))
1240 if (MOI->isEarlyClobber())
1241 isEarlyClobber = true;
1245 report("Defining instruction does not modify register", MI);
1246 *OS << "Valno #" << VNI->id << " in " << LI << '\n';
1249 // Early clobber defs begin at USE slots, but other defs must begin at
1251 if (isEarlyClobber) {
1252 if (!VNI->def.isEarlyClobber()) {
1253 report("Early clobber def must be at an early-clobber slot", MBB, LI);
1254 *OS << "Valno #" << VNI->id << " is defined at " << VNI->def << '\n';
1256 } else if (!VNI->def.isRegister()) {
1257 report("Non-PHI, non-early clobber def must be at a register slot",
1259 *OS << "Valno #" << VNI->id << " is defined at " << VNI->def << '\n';
1264 MachineVerifier::verifyLiveIntervalSegment(const LiveInterval &LI,
1265 LiveInterval::const_iterator I) {
1266 const VNInfo *VNI = I->valno;
1267 assert(VNI && "Live range has no valno");
1269 if (VNI->id >= LI.getNumValNums() || VNI != LI.getValNumInfo(VNI->id)) {
1270 report("Foreign valno in live range", MF, LI);
1271 *OS << *I << " has a bad valno\n";
1274 if (VNI->isUnused()) {
1275 report("Live range valno is marked unused", MF, LI);
1279 const MachineBasicBlock *MBB = LiveInts->getMBBFromIndex(I->start);
1281 report("Bad start of live segment, no basic block", MF, LI);
1285 SlotIndex MBBStartIdx = LiveInts->getMBBStartIdx(MBB);
1286 if (I->start != MBBStartIdx && I->start != VNI->def) {
1287 report("Live segment must begin at MBB entry or valno def", MBB, LI);
1291 const MachineBasicBlock *EndMBB =
1292 LiveInts->getMBBFromIndex(I->end.getPrevSlot());
1294 report("Bad end of live segment, no basic block", MF, LI);
1299 // No more checks for live-out segments.
1300 if (I->end == LiveInts->getMBBEndIdx(EndMBB))
1303 // RegUnit intervals are allowed dead phis.
1304 if (!TargetRegisterInfo::isVirtualRegister(LI.reg) && VNI->isPHIDef() &&
1305 I->start == VNI->def && I->end == VNI->def.getDeadSlot())
1308 // The live segment is ending inside EndMBB
1309 const MachineInstr *MI =
1310 LiveInts->getInstructionFromIndex(I->end.getPrevSlot());
1312 report("Live segment doesn't end at a valid instruction", EndMBB, LI);
1317 // The block slot must refer to a basic block boundary.
1318 if (I->end.isBlock()) {
1319 report("Live segment ends at B slot of an instruction", EndMBB, LI);
1323 if (I->end.isDead()) {
1324 // Segment ends on the dead slot.
1325 // That means there must be a dead def.
1326 if (!SlotIndex::isSameInstr(I->start, I->end)) {
1327 report("Live segment ending at dead slot spans instructions", EndMBB, LI);
1332 // A live segment can only end at an early-clobber slot if it is being
1333 // redefined by an early-clobber def.
1334 if (I->end.isEarlyClobber()) {
1335 if (I+1 == LI.end() || (I+1)->start != I->end) {
1336 report("Live segment ending at early clobber slot must be "
1337 "redefined by an EC def in the same instruction", EndMBB, LI);
1342 // The following checks only apply to virtual registers. Physreg liveness
1343 // is too weird to check.
1344 if (TargetRegisterInfo::isVirtualRegister(LI.reg)) {
1345 // A live range can end with either a redefinition, a kill flag on a
1346 // use, or a dead flag on a def.
1347 bool hasRead = false;
1348 bool hasDeadDef = false;
1349 for (ConstMIBundleOperands MOI(MI); MOI.isValid(); ++MOI) {
1350 if (!MOI->isReg() || MOI->getReg() != LI.reg)
1352 if (MOI->readsReg())
1354 if (MOI->isDef() && MOI->isDead())
1358 if (I->end.isDead()) {
1360 report("Instruction doesn't have a dead def operand", MI);
1362 *OS << " in " << LI << '\n';
1366 report("Instruction ending live range doesn't read the register", MI);
1367 *OS << *I << " in " << LI << '\n';
1372 // Now check all the basic blocks in this live segment.
1373 MachineFunction::const_iterator MFI = MBB;
1374 // Is this live range the beginning of a non-PHIDef VN?
1375 if (I->start == VNI->def && !VNI->isPHIDef()) {
1376 // Not live-in to any blocks.
1383 assert(LiveInts->isLiveInToMBB(LI, MFI));
1384 // We don't know how to track physregs into a landing pad.
1385 if (!TargetRegisterInfo::isVirtualRegister(LI.reg) &&
1386 MFI->isLandingPad()) {
1387 if (&*MFI == EndMBB)
1393 // Is VNI a PHI-def in the current block?
1394 bool IsPHI = VNI->isPHIDef() &&
1395 VNI->def == LiveInts->getMBBStartIdx(MFI);
1397 // Check that VNI is live-out of all predecessors.
1398 for (MachineBasicBlock::const_pred_iterator PI = MFI->pred_begin(),
1399 PE = MFI->pred_end(); PI != PE; ++PI) {
1400 SlotIndex PEnd = LiveInts->getMBBEndIdx(*PI);
1401 const VNInfo *PVNI = LI.getVNInfoBefore(PEnd);
1403 // All predecessors must have a live-out value.
1405 report("Register not marked live out of predecessor", *PI, LI);
1406 *OS << "Valno #" << VNI->id << " live into BB#" << MFI->getNumber()
1407 << '@' << LiveInts->getMBBStartIdx(MFI) << ", not live before "
1412 // Only PHI-defs can take different predecessor values.
1413 if (!IsPHI && PVNI != VNI) {
1414 report("Different value live out of predecessor", *PI, LI);
1415 *OS << "Valno #" << PVNI->id << " live out of BB#"
1416 << (*PI)->getNumber() << '@' << PEnd
1417 << "\nValno #" << VNI->id << " live into BB#" << MFI->getNumber()
1418 << '@' << LiveInts->getMBBStartIdx(MFI) << '\n';
1421 if (&*MFI == EndMBB)
1427 void MachineVerifier::verifyLiveInterval(const LiveInterval &LI) {
1428 for (LiveInterval::const_vni_iterator I = LI.vni_begin(), E = LI.vni_end();
1430 verifyLiveIntervalValue(LI, *I);
1432 for (LiveInterval::const_iterator I = LI.begin(), E = LI.end(); I!=E; ++I)
1433 verifyLiveIntervalSegment(LI, I);
1435 // Check the LI only has one connected component.
1436 if (TargetRegisterInfo::isVirtualRegister(LI.reg)) {
1437 ConnectedVNInfoEqClasses ConEQ(*LiveInts);
1438 unsigned NumComp = ConEQ.Classify(&LI);
1440 report("Multiple connected components in live interval", MF, LI);
1441 for (unsigned comp = 0; comp != NumComp; ++comp) {
1442 *OS << comp << ": valnos";
1443 for (LiveInterval::const_vni_iterator I = LI.vni_begin(),
1444 E = LI.vni_end(); I!=E; ++I)
1445 if (comp == ConEQ.getEqClass(*I))
1446 *OS << ' ' << (*I)->id;