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/CodeGen/Passes.h"
27 #include "llvm/ADT/DenseSet.h"
28 #include "llvm/ADT/DepthFirstIterator.h"
29 #include "llvm/ADT/SetOperations.h"
30 #include "llvm/ADT/SmallVector.h"
31 #include "llvm/CodeGen/LiveIntervalAnalysis.h"
32 #include "llvm/CodeGen/LiveStackAnalysis.h"
33 #include "llvm/CodeGen/LiveVariables.h"
34 #include "llvm/CodeGen/MachineFrameInfo.h"
35 #include "llvm/CodeGen/MachineFunctionPass.h"
36 #include "llvm/CodeGen/MachineInstrBundle.h"
37 #include "llvm/CodeGen/MachineMemOperand.h"
38 #include "llvm/CodeGen/MachineRegisterInfo.h"
39 #include "llvm/IR/BasicBlock.h"
40 #include "llvm/IR/InlineAsm.h"
41 #include "llvm/IR/Instructions.h"
42 #include "llvm/MC/MCAsmInfo.h"
43 #include "llvm/Support/Debug.h"
44 #include "llvm/Support/ErrorHandling.h"
45 #include "llvm/Support/raw_ostream.h"
46 #include "llvm/Target/TargetInstrInfo.h"
47 #include "llvm/Target/TargetMachine.h"
48 #include "llvm/Target/TargetRegisterInfo.h"
52 struct MachineVerifier {
54 MachineVerifier(Pass *pass, const char *b) :
57 OutFileName(getenv("LLVM_VERIFY_MACHINEINSTRS"))
60 bool runOnMachineFunction(MachineFunction &MF);
64 const char *const OutFileName;
66 const MachineFunction *MF;
67 const TargetMachine *TM;
68 const TargetInstrInfo *TII;
69 const TargetRegisterInfo *TRI;
70 const MachineRegisterInfo *MRI;
74 typedef SmallVector<unsigned, 16> RegVector;
75 typedef SmallVector<const uint32_t*, 4> RegMaskVector;
76 typedef DenseSet<unsigned> RegSet;
77 typedef DenseMap<unsigned, const MachineInstr*> RegMap;
78 typedef SmallPtrSet<const MachineBasicBlock*, 8> BlockSet;
80 const MachineInstr *FirstTerminator;
81 BlockSet FunctionBlocks;
83 BitVector regsReserved;
85 RegVector regsDefined, regsDead, regsKilled;
86 RegMaskVector regMasks;
87 RegSet regsLiveInButUnused;
91 // Add Reg and any sub-registers to RV
92 void addRegWithSubRegs(RegVector &RV, unsigned Reg) {
94 if (TargetRegisterInfo::isPhysicalRegister(Reg))
95 for (MCSubRegIterator SubRegs(Reg, TRI); SubRegs.isValid(); ++SubRegs)
96 RV.push_back(*SubRegs);
100 // Is this MBB reachable from the MF entry point?
103 // Vregs that must be live in because they are used without being
104 // defined. Map value is the user.
107 // Regs killed in MBB. They may be defined again, and will then be in both
108 // regsKilled and regsLiveOut.
111 // Regs defined in MBB and live out. Note that vregs passing through may
112 // be live out without being mentioned here.
115 // Vregs that pass through MBB untouched. This set is disjoint from
116 // regsKilled and regsLiveOut.
119 // Vregs that must pass through MBB because they are needed by a successor
120 // block. This set is disjoint from regsLiveOut.
121 RegSet vregsRequired;
123 // Set versions of block's predecessor and successor lists.
124 BlockSet Preds, Succs;
126 BBInfo() : reachable(false) {}
128 // Add register to vregsPassed if it belongs there. Return true if
130 bool addPassed(unsigned Reg) {
131 if (!TargetRegisterInfo::isVirtualRegister(Reg))
133 if (regsKilled.count(Reg) || regsLiveOut.count(Reg))
135 return vregsPassed.insert(Reg).second;
138 // Same for a full set.
139 bool addPassed(const RegSet &RS) {
140 bool changed = false;
141 for (RegSet::const_iterator I = RS.begin(), E = RS.end(); I != E; ++I)
147 // Add register to vregsRequired if it belongs there. Return true if
149 bool addRequired(unsigned Reg) {
150 if (!TargetRegisterInfo::isVirtualRegister(Reg))
152 if (regsLiveOut.count(Reg))
154 return vregsRequired.insert(Reg).second;
157 // Same for a full set.
158 bool addRequired(const RegSet &RS) {
159 bool changed = false;
160 for (RegSet::const_iterator I = RS.begin(), E = RS.end(); I != E; ++I)
166 // Same for a full map.
167 bool addRequired(const RegMap &RM) {
168 bool changed = false;
169 for (RegMap::const_iterator I = RM.begin(), E = RM.end(); I != E; ++I)
170 if (addRequired(I->first))
175 // Live-out registers are either in regsLiveOut or vregsPassed.
176 bool isLiveOut(unsigned Reg) const {
177 return regsLiveOut.count(Reg) || vregsPassed.count(Reg);
181 // Extra register info per MBB.
182 DenseMap<const MachineBasicBlock*, BBInfo> MBBInfoMap;
184 bool isReserved(unsigned Reg) {
185 return Reg < regsReserved.size() && regsReserved.test(Reg);
188 bool isAllocatable(unsigned Reg) {
189 return Reg < TRI->getNumRegs() && MRI->isAllocatable(Reg);
192 // Analysis information if available
193 LiveVariables *LiveVars;
194 LiveIntervals *LiveInts;
195 LiveStacks *LiveStks;
196 SlotIndexes *Indexes;
198 void visitMachineFunctionBefore();
199 void visitMachineBasicBlockBefore(const MachineBasicBlock *MBB);
200 void visitMachineBundleBefore(const MachineInstr *MI);
201 void visitMachineInstrBefore(const MachineInstr *MI);
202 void visitMachineOperand(const MachineOperand *MO, unsigned MONum);
203 void visitMachineInstrAfter(const MachineInstr *MI);
204 void visitMachineBundleAfter(const MachineInstr *MI);
205 void visitMachineBasicBlockAfter(const MachineBasicBlock *MBB);
206 void visitMachineFunctionAfter();
208 void report(const char *msg, const MachineFunction *MF);
209 void report(const char *msg, const MachineBasicBlock *MBB);
210 void report(const char *msg, const MachineInstr *MI);
211 void report(const char *msg, const MachineOperand *MO, unsigned MONum);
212 void report(const char *msg, const MachineFunction *MF,
213 const LiveInterval &LI);
214 void report(const char *msg, const MachineBasicBlock *MBB,
215 const LiveInterval &LI);
217 void verifyInlineAsm(const MachineInstr *MI);
219 void checkLiveness(const MachineOperand *MO, unsigned MONum);
220 void markReachable(const MachineBasicBlock *MBB);
221 void calcRegsPassed();
222 void checkPHIOps(const MachineBasicBlock *MBB);
224 void calcRegsRequired();
225 void verifyLiveVariables();
226 void verifyLiveIntervals();
227 void verifyLiveInterval(const LiveInterval&);
228 void verifyLiveIntervalValue(const LiveInterval&, VNInfo*);
229 void verifyLiveIntervalSegment(const LiveInterval&,
230 LiveInterval::const_iterator);
232 void verifyStackFrame();
235 struct MachineVerifierPass : public MachineFunctionPass {
236 static char ID; // Pass ID, replacement for typeid
237 const char *const Banner;
239 MachineVerifierPass(const char *b = 0)
240 : MachineFunctionPass(ID), Banner(b) {
241 initializeMachineVerifierPassPass(*PassRegistry::getPassRegistry());
244 void getAnalysisUsage(AnalysisUsage &AU) const {
245 AU.setPreservesAll();
246 MachineFunctionPass::getAnalysisUsage(AU);
249 bool runOnMachineFunction(MachineFunction &MF) {
250 MF.verify(this, Banner);
257 char MachineVerifierPass::ID = 0;
258 INITIALIZE_PASS(MachineVerifierPass, "machineverifier",
259 "Verify generated machine code", false, false)
261 FunctionPass *llvm::createMachineVerifierPass(const char *Banner) {
262 return new MachineVerifierPass(Banner);
265 void MachineFunction::verify(Pass *p, const char *Banner) const {
266 MachineVerifier(p, Banner)
267 .runOnMachineFunction(const_cast<MachineFunction&>(*this));
270 bool MachineVerifier::runOnMachineFunction(MachineFunction &MF) {
271 raw_ostream *OutFile = 0;
273 std::string ErrorInfo;
274 OutFile = new raw_fd_ostream(OutFileName, ErrorInfo,
275 raw_fd_ostream::F_Append);
276 if (!ErrorInfo.empty()) {
277 errs() << "Error opening '" << OutFileName << "': " << ErrorInfo << '\n';
289 TM = &MF.getTarget();
290 TII = TM->getInstrInfo();
291 TRI = TM->getRegisterInfo();
292 MRI = &MF.getRegInfo();
299 LiveInts = PASS->getAnalysisIfAvailable<LiveIntervals>();
300 // We don't want to verify LiveVariables if LiveIntervals is available.
302 LiveVars = PASS->getAnalysisIfAvailable<LiveVariables>();
303 LiveStks = PASS->getAnalysisIfAvailable<LiveStacks>();
304 Indexes = PASS->getAnalysisIfAvailable<SlotIndexes>();
307 visitMachineFunctionBefore();
308 for (MachineFunction::const_iterator MFI = MF.begin(), MFE = MF.end();
310 visitMachineBasicBlockBefore(MFI);
311 // Keep track of the current bundle header.
312 const MachineInstr *CurBundle = 0;
313 // Do we expect the next instruction to be part of the same bundle?
314 bool InBundle = false;
316 for (MachineBasicBlock::const_instr_iterator MBBI = MFI->instr_begin(),
317 MBBE = MFI->instr_end(); MBBI != MBBE; ++MBBI) {
318 if (MBBI->getParent() != MFI) {
319 report("Bad instruction parent pointer", MFI);
320 *OS << "Instruction: " << *MBBI;
324 // Check for consistent bundle flags.
325 if (InBundle && !MBBI->isBundledWithPred())
326 report("Missing BundledPred flag, "
327 "BundledSucc was set on predecessor", MBBI);
328 if (!InBundle && MBBI->isBundledWithPred())
329 report("BundledPred flag is set, "
330 "but BundledSucc not set on predecessor", MBBI);
332 // Is this a bundle header?
333 if (!MBBI->isInsideBundle()) {
335 visitMachineBundleAfter(CurBundle);
337 visitMachineBundleBefore(CurBundle);
338 } else if (!CurBundle)
339 report("No bundle header", MBBI);
340 visitMachineInstrBefore(MBBI);
341 for (unsigned I = 0, E = MBBI->getNumOperands(); I != E; ++I)
342 visitMachineOperand(&MBBI->getOperand(I), I);
343 visitMachineInstrAfter(MBBI);
345 // Was this the last bundled instruction?
346 InBundle = MBBI->isBundledWithSucc();
349 visitMachineBundleAfter(CurBundle);
351 report("BundledSucc flag set on last instruction in block", &MFI->back());
352 visitMachineBasicBlockAfter(MFI);
354 visitMachineFunctionAfter();
358 else if (foundErrors)
359 report_fatal_error("Found "+Twine(foundErrors)+" machine code errors.");
367 regsLiveInButUnused.clear();
370 return false; // no changes
373 void MachineVerifier::report(const char *msg, const MachineFunction *MF) {
376 if (!foundErrors++) {
378 *OS << "# " << Banner << '\n';
379 MF->print(*OS, Indexes);
381 *OS << "*** Bad machine code: " << msg << " ***\n"
382 << "- function: " << MF->getName() << "\n";
385 void MachineVerifier::report(const char *msg, const MachineBasicBlock *MBB) {
387 report(msg, MBB->getParent());
388 *OS << "- basic block: BB#" << MBB->getNumber()
389 << ' ' << MBB->getName()
390 << " (" << (const void*)MBB << ')';
392 *OS << " [" << Indexes->getMBBStartIdx(MBB)
393 << ';' << Indexes->getMBBEndIdx(MBB) << ')';
397 void MachineVerifier::report(const char *msg, const MachineInstr *MI) {
399 report(msg, MI->getParent());
400 *OS << "- instruction: ";
401 if (Indexes && Indexes->hasIndex(MI))
402 *OS << Indexes->getInstructionIndex(MI) << '\t';
406 void MachineVerifier::report(const char *msg,
407 const MachineOperand *MO, unsigned MONum) {
409 report(msg, MO->getParent());
410 *OS << "- operand " << MONum << ": ";
415 void MachineVerifier::report(const char *msg, const MachineFunction *MF,
416 const LiveInterval &LI) {
418 *OS << "- interval: ";
419 if (TargetRegisterInfo::isVirtualRegister(LI.reg))
420 *OS << PrintReg(LI.reg, TRI);
422 *OS << PrintRegUnit(LI.reg, TRI);
423 *OS << ' ' << LI << '\n';
426 void MachineVerifier::report(const char *msg, const MachineBasicBlock *MBB,
427 const LiveInterval &LI) {
429 *OS << "- interval: ";
430 if (TargetRegisterInfo::isVirtualRegister(LI.reg))
431 *OS << PrintReg(LI.reg, TRI);
433 *OS << PrintRegUnit(LI.reg, TRI);
434 *OS << ' ' << LI << '\n';
437 void MachineVerifier::markReachable(const MachineBasicBlock *MBB) {
438 BBInfo &MInfo = MBBInfoMap[MBB];
439 if (!MInfo.reachable) {
440 MInfo.reachable = true;
441 for (MachineBasicBlock::const_succ_iterator SuI = MBB->succ_begin(),
442 SuE = MBB->succ_end(); SuI != SuE; ++SuI)
447 void MachineVerifier::visitMachineFunctionBefore() {
448 lastIndex = SlotIndex();
449 regsReserved = MRI->getReservedRegs();
451 // A sub-register of a reserved register is also reserved
452 for (int Reg = regsReserved.find_first(); Reg>=0;
453 Reg = regsReserved.find_next(Reg)) {
454 for (MCSubRegIterator SubRegs(Reg, TRI); SubRegs.isValid(); ++SubRegs) {
455 // FIXME: This should probably be:
456 // assert(regsReserved.test(*SubRegs) && "Non-reserved sub-register");
457 regsReserved.set(*SubRegs);
461 markReachable(&MF->front());
463 // Build a set of the basic blocks in the function.
464 FunctionBlocks.clear();
465 for (MachineFunction::const_iterator
466 I = MF->begin(), E = MF->end(); I != E; ++I) {
467 FunctionBlocks.insert(I);
468 BBInfo &MInfo = MBBInfoMap[I];
470 MInfo.Preds.insert(I->pred_begin(), I->pred_end());
471 if (MInfo.Preds.size() != I->pred_size())
472 report("MBB has duplicate entries in its predecessor list.", I);
474 MInfo.Succs.insert(I->succ_begin(), I->succ_end());
475 if (MInfo.Succs.size() != I->succ_size())
476 report("MBB has duplicate entries in its successor list.", I);
479 // Check that the register use lists are sane.
480 MRI->verifyUseLists();
485 // Does iterator point to a and b as the first two elements?
486 static bool matchPair(MachineBasicBlock::const_succ_iterator i,
487 const MachineBasicBlock *a, const MachineBasicBlock *b) {
496 MachineVerifier::visitMachineBasicBlockBefore(const MachineBasicBlock *MBB) {
500 // If this block has allocatable physical registers live-in, check that
501 // it is an entry block or landing pad.
502 for (MachineBasicBlock::livein_iterator LI = MBB->livein_begin(),
503 LE = MBB->livein_end();
506 if (isAllocatable(reg) && !MBB->isLandingPad() &&
507 MBB != MBB->getParent()->begin()) {
508 report("MBB has allocable live-in, but isn't entry or landing-pad.", MBB);
513 // Count the number of landing pad successors.
514 SmallPtrSet<MachineBasicBlock*, 4> LandingPadSuccs;
515 for (MachineBasicBlock::const_succ_iterator I = MBB->succ_begin(),
516 E = MBB->succ_end(); I != E; ++I) {
517 if ((*I)->isLandingPad())
518 LandingPadSuccs.insert(*I);
519 if (!FunctionBlocks.count(*I))
520 report("MBB has successor that isn't part of the function.", MBB);
521 if (!MBBInfoMap[*I].Preds.count(MBB)) {
522 report("Inconsistent CFG", MBB);
523 *OS << "MBB is not in the predecessor list of the successor BB#"
524 << (*I)->getNumber() << ".\n";
528 // Check the predecessor list.
529 for (MachineBasicBlock::const_pred_iterator I = MBB->pred_begin(),
530 E = MBB->pred_end(); I != E; ++I) {
531 if (!FunctionBlocks.count(*I))
532 report("MBB has predecessor that isn't part of the function.", MBB);
533 if (!MBBInfoMap[*I].Succs.count(MBB)) {
534 report("Inconsistent CFG", MBB);
535 *OS << "MBB is not in the successor list of the predecessor BB#"
536 << (*I)->getNumber() << ".\n";
540 const MCAsmInfo *AsmInfo = TM->getMCAsmInfo();
541 const BasicBlock *BB = MBB->getBasicBlock();
542 if (LandingPadSuccs.size() > 1 &&
544 AsmInfo->getExceptionHandlingType() == ExceptionHandling::SjLj &&
545 BB && isa<SwitchInst>(BB->getTerminator())))
546 report("MBB has more than one landing pad successor", MBB);
548 // Call AnalyzeBranch. If it succeeds, there several more conditions to check.
549 MachineBasicBlock *TBB = 0, *FBB = 0;
550 SmallVector<MachineOperand, 4> Cond;
551 if (!TII->AnalyzeBranch(*const_cast<MachineBasicBlock *>(MBB),
553 // Ok, AnalyzeBranch thinks it knows what's going on with this block. Let's
554 // check whether its answers match up with reality.
556 // Block falls through to its successor.
557 MachineFunction::const_iterator MBBI = MBB;
559 if (MBBI == MF->end()) {
560 // It's possible that the block legitimately ends with a noreturn
561 // call or an unreachable, in which case it won't actually fall
562 // out the bottom of the function.
563 } else if (MBB->succ_size() == LandingPadSuccs.size()) {
564 // It's possible that the block legitimately ends with a noreturn
565 // call or an unreachable, in which case it won't actuall fall
567 } else if (MBB->succ_size() != 1+LandingPadSuccs.size()) {
568 report("MBB exits via unconditional fall-through but doesn't have "
569 "exactly one CFG successor!", MBB);
570 } else if (!MBB->isSuccessor(MBBI)) {
571 report("MBB exits via unconditional fall-through but its successor "
572 "differs from its CFG successor!", MBB);
574 if (!MBB->empty() && getBundleStart(&MBB->back())->isBarrier() &&
575 !TII->isPredicated(getBundleStart(&MBB->back()))) {
576 report("MBB exits via unconditional fall-through but ends with a "
577 "barrier instruction!", MBB);
580 report("MBB exits via unconditional fall-through but has a condition!",
583 } else if (TBB && !FBB && Cond.empty()) {
584 // Block unconditionally branches somewhere.
585 if (MBB->succ_size() != 1+LandingPadSuccs.size()) {
586 report("MBB exits via unconditional branch but doesn't have "
587 "exactly one CFG successor!", MBB);
588 } else if (!MBB->isSuccessor(TBB)) {
589 report("MBB exits via unconditional branch but the CFG "
590 "successor doesn't match the actual successor!", MBB);
593 report("MBB exits via unconditional branch but doesn't contain "
594 "any instructions!", MBB);
595 } else if (!getBundleStart(&MBB->back())->isBarrier()) {
596 report("MBB exits via unconditional branch but doesn't end with a "
597 "barrier instruction!", MBB);
598 } else if (!getBundleStart(&MBB->back())->isTerminator()) {
599 report("MBB exits via unconditional branch but the branch isn't a "
600 "terminator instruction!", MBB);
602 } else if (TBB && !FBB && !Cond.empty()) {
603 // Block conditionally branches somewhere, otherwise falls through.
604 MachineFunction::const_iterator MBBI = MBB;
606 if (MBBI == MF->end()) {
607 report("MBB conditionally falls through out of function!", MBB);
608 } else if (MBB->succ_size() == 1) {
609 // A conditional branch with only one successor is weird, but allowed.
611 report("MBB exits via conditional branch/fall-through but only has "
612 "one CFG successor!", MBB);
613 else if (TBB != *MBB->succ_begin())
614 report("MBB exits via conditional branch/fall-through but the CFG "
615 "successor don't match the actual successor!", MBB);
616 } else if (MBB->succ_size() != 2) {
617 report("MBB exits via conditional branch/fall-through but doesn't have "
618 "exactly two CFG successors!", MBB);
619 } else if (!matchPair(MBB->succ_begin(), TBB, MBBI)) {
620 report("MBB exits via conditional branch/fall-through but the CFG "
621 "successors don't match the actual successors!", MBB);
624 report("MBB exits via conditional branch/fall-through but doesn't "
625 "contain any instructions!", MBB);
626 } else if (getBundleStart(&MBB->back())->isBarrier()) {
627 report("MBB exits via conditional branch/fall-through but ends with a "
628 "barrier instruction!", MBB);
629 } else if (!getBundleStart(&MBB->back())->isTerminator()) {
630 report("MBB exits via conditional branch/fall-through but the branch "
631 "isn't a terminator instruction!", MBB);
633 } else if (TBB && FBB) {
634 // Block conditionally branches somewhere, otherwise branches
636 if (MBB->succ_size() == 1) {
637 // A conditional branch with only one successor is weird, but allowed.
639 report("MBB exits via conditional branch/branch through but only has "
640 "one CFG successor!", MBB);
641 else if (TBB != *MBB->succ_begin())
642 report("MBB exits via conditional branch/branch through but the CFG "
643 "successor don't match the actual successor!", MBB);
644 } else if (MBB->succ_size() != 2) {
645 report("MBB exits via conditional branch/branch but doesn't have "
646 "exactly two CFG successors!", MBB);
647 } else if (!matchPair(MBB->succ_begin(), TBB, FBB)) {
648 report("MBB exits via conditional branch/branch but the CFG "
649 "successors don't match the actual successors!", MBB);
652 report("MBB exits via conditional branch/branch but doesn't "
653 "contain any instructions!", MBB);
654 } else if (!getBundleStart(&MBB->back())->isBarrier()) {
655 report("MBB exits via conditional branch/branch but doesn't end with a "
656 "barrier instruction!", MBB);
657 } else if (!getBundleStart(&MBB->back())->isTerminator()) {
658 report("MBB exits via conditional branch/branch but the branch "
659 "isn't a terminator instruction!", MBB);
662 report("MBB exits via conditinal branch/branch but there's no "
666 report("AnalyzeBranch returned invalid data!", MBB);
671 for (MachineBasicBlock::livein_iterator I = MBB->livein_begin(),
672 E = MBB->livein_end(); I != E; ++I) {
673 if (!TargetRegisterInfo::isPhysicalRegister(*I)) {
674 report("MBB live-in list contains non-physical register", MBB);
677 for (MCSubRegIterator SubRegs(*I, TRI, /*IncludeSelf=*/true);
678 SubRegs.isValid(); ++SubRegs)
679 regsLive.insert(*SubRegs);
681 regsLiveInButUnused = regsLive;
683 const MachineFrameInfo *MFI = MF->getFrameInfo();
684 assert(MFI && "Function has no frame info");
685 BitVector PR = MFI->getPristineRegs(MBB);
686 for (int I = PR.find_first(); I>0; I = PR.find_next(I)) {
687 for (MCSubRegIterator SubRegs(I, TRI, /*IncludeSelf=*/true);
688 SubRegs.isValid(); ++SubRegs)
689 regsLive.insert(*SubRegs);
696 lastIndex = Indexes->getMBBStartIdx(MBB);
699 // This function gets called for all bundle headers, including normal
700 // stand-alone unbundled instructions.
701 void MachineVerifier::visitMachineBundleBefore(const MachineInstr *MI) {
702 if (Indexes && Indexes->hasIndex(MI)) {
703 SlotIndex idx = Indexes->getInstructionIndex(MI);
704 if (!(idx > lastIndex)) {
705 report("Instruction index out of order", MI);
706 *OS << "Last instruction was at " << lastIndex << '\n';
711 // Ensure non-terminators don't follow terminators.
712 // Ignore predicated terminators formed by if conversion.
713 // FIXME: If conversion shouldn't need to violate this rule.
714 if (MI->isTerminator() && !TII->isPredicated(MI)) {
715 if (!FirstTerminator)
716 FirstTerminator = MI;
717 } else if (FirstTerminator) {
718 report("Non-terminator instruction after the first terminator", MI);
719 *OS << "First terminator was:\t" << *FirstTerminator;
723 // The operands on an INLINEASM instruction must follow a template.
724 // Verify that the flag operands make sense.
725 void MachineVerifier::verifyInlineAsm(const MachineInstr *MI) {
726 // The first two operands on INLINEASM are the asm string and global flags.
727 if (MI->getNumOperands() < 2) {
728 report("Too few operands on inline asm", MI);
731 if (!MI->getOperand(0).isSymbol())
732 report("Asm string must be an external symbol", MI);
733 if (!MI->getOperand(1).isImm())
734 report("Asm flags must be an immediate", MI);
735 // Allowed flags are Extra_HasSideEffects = 1, Extra_IsAlignStack = 2,
736 // Extra_AsmDialect = 4, Extra_MayLoad = 8, and Extra_MayStore = 16.
737 if (!isUInt<5>(MI->getOperand(1).getImm()))
738 report("Unknown asm flags", &MI->getOperand(1), 1);
740 assert(InlineAsm::MIOp_FirstOperand == 2 && "Asm format changed");
742 unsigned OpNo = InlineAsm::MIOp_FirstOperand;
744 for (unsigned e = MI->getNumOperands(); OpNo < e; OpNo += NumOps) {
745 const MachineOperand &MO = MI->getOperand(OpNo);
746 // There may be implicit ops after the fixed operands.
749 NumOps = 1 + InlineAsm::getNumOperandRegisters(MO.getImm());
752 if (OpNo > MI->getNumOperands())
753 report("Missing operands in last group", MI);
755 // An optional MDNode follows the groups.
756 if (OpNo < MI->getNumOperands() && MI->getOperand(OpNo).isMetadata())
759 // All trailing operands must be implicit registers.
760 for (unsigned e = MI->getNumOperands(); OpNo < e; ++OpNo) {
761 const MachineOperand &MO = MI->getOperand(OpNo);
762 if (!MO.isReg() || !MO.isImplicit())
763 report("Expected implicit register after groups", &MO, OpNo);
767 void MachineVerifier::visitMachineInstrBefore(const MachineInstr *MI) {
768 const MCInstrDesc &MCID = MI->getDesc();
769 if (MI->getNumOperands() < MCID.getNumOperands()) {
770 report("Too few operands", MI);
771 *OS << MCID.getNumOperands() << " operands expected, but "
772 << MI->getNumExplicitOperands() << " given.\n";
775 // Check the tied operands.
776 if (MI->isInlineAsm())
779 // Check the MachineMemOperands for basic consistency.
780 for (MachineInstr::mmo_iterator I = MI->memoperands_begin(),
781 E = MI->memoperands_end(); I != E; ++I) {
782 if ((*I)->isLoad() && !MI->mayLoad())
783 report("Missing mayLoad flag", MI);
784 if ((*I)->isStore() && !MI->mayStore())
785 report("Missing mayStore flag", MI);
788 // Debug values must not have a slot index.
789 // Other instructions must have one, unless they are inside a bundle.
791 bool mapped = !LiveInts->isNotInMIMap(MI);
792 if (MI->isDebugValue()) {
794 report("Debug instruction has a slot index", MI);
795 } else if (MI->isInsideBundle()) {
797 report("Instruction inside bundle has a slot index", MI);
800 report("Missing slot index", MI);
805 if (!TII->verifyInstruction(MI, ErrorInfo))
806 report(ErrorInfo.data(), MI);
810 MachineVerifier::visitMachineOperand(const MachineOperand *MO, unsigned MONum) {
811 const MachineInstr *MI = MO->getParent();
812 const MCInstrDesc &MCID = MI->getDesc();
814 // The first MCID.NumDefs operands must be explicit register defines
815 if (MONum < MCID.getNumDefs()) {
816 const MCOperandInfo &MCOI = MCID.OpInfo[MONum];
818 report("Explicit definition must be a register", MO, MONum);
819 else if (!MO->isDef() && !MCOI.isOptionalDef())
820 report("Explicit definition marked as use", MO, MONum);
821 else if (MO->isImplicit())
822 report("Explicit definition marked as implicit", MO, MONum);
823 } else if (MONum < MCID.getNumOperands()) {
824 const MCOperandInfo &MCOI = MCID.OpInfo[MONum];
825 // Don't check if it's the last operand in a variadic instruction. See,
826 // e.g., LDM_RET in the arm back end.
828 !(MI->isVariadic() && MONum == MCID.getNumOperands()-1)) {
829 if (MO->isDef() && !MCOI.isOptionalDef())
830 report("Explicit operand marked as def", MO, MONum);
831 if (MO->isImplicit())
832 report("Explicit operand marked as implicit", MO, MONum);
835 int TiedTo = MCID.getOperandConstraint(MONum, MCOI::TIED_TO);
838 report("Tied use must be a register", MO, MONum);
839 else if (!MO->isTied())
840 report("Operand should be tied", MO, MONum);
841 else if (unsigned(TiedTo) != MI->findTiedOperandIdx(MONum))
842 report("Tied def doesn't match MCInstrDesc", MO, MONum);
843 } else if (MO->isReg() && MO->isTied())
844 report("Explicit operand should not be tied", MO, MONum);
846 // ARM adds %reg0 operands to indicate predicates. We'll allow that.
847 if (MO->isReg() && !MO->isImplicit() && !MI->isVariadic() && MO->getReg())
848 report("Extra explicit operand on non-variadic instruction", MO, MONum);
851 switch (MO->getType()) {
852 case MachineOperand::MO_Register: {
853 const unsigned Reg = MO->getReg();
856 if (MRI->tracksLiveness() && !MI->isDebugValue())
857 checkLiveness(MO, MONum);
859 // Verify the consistency of tied operands.
861 unsigned OtherIdx = MI->findTiedOperandIdx(MONum);
862 const MachineOperand &OtherMO = MI->getOperand(OtherIdx);
863 if (!OtherMO.isReg())
864 report("Must be tied to a register", MO, MONum);
865 if (!OtherMO.isTied())
866 report("Missing tie flags on tied operand", MO, MONum);
867 if (MI->findTiedOperandIdx(OtherIdx) != MONum)
868 report("Inconsistent tie links", MO, MONum);
869 if (MONum < MCID.getNumDefs()) {
870 if (OtherIdx < MCID.getNumOperands()) {
871 if (-1 == MCID.getOperandConstraint(OtherIdx, MCOI::TIED_TO))
872 report("Explicit def tied to explicit use without tie constraint",
875 if (!OtherMO.isImplicit())
876 report("Explicit def should be tied to implicit use", MO, MONum);
881 // Verify two-address constraints after leaving SSA form.
883 if (!MRI->isSSA() && MO->isUse() &&
884 MI->isRegTiedToDefOperand(MONum, &DefIdx) &&
885 Reg != MI->getOperand(DefIdx).getReg())
886 report("Two-address instruction operands must be identical", MO, MONum);
888 // Check register classes.
889 if (MONum < MCID.getNumOperands() && !MO->isImplicit()) {
890 unsigned SubIdx = MO->getSubReg();
892 if (TargetRegisterInfo::isPhysicalRegister(Reg)) {
894 report("Illegal subregister index for physical register", MO, MONum);
897 if (const TargetRegisterClass *DRC =
898 TII->getRegClass(MCID, MONum, TRI, *MF)) {
899 if (!DRC->contains(Reg)) {
900 report("Illegal physical register for instruction", MO, MONum);
901 *OS << TRI->getName(Reg) << " is not a "
902 << DRC->getName() << " register.\n";
907 const TargetRegisterClass *RC = MRI->getRegClass(Reg);
909 const TargetRegisterClass *SRC =
910 TRI->getSubClassWithSubReg(RC, SubIdx);
912 report("Invalid subregister index for virtual register", MO, MONum);
913 *OS << "Register class " << RC->getName()
914 << " does not support subreg index " << SubIdx << "\n";
918 report("Invalid register class for subregister index", MO, MONum);
919 *OS << "Register class " << RC->getName()
920 << " does not fully support subreg index " << SubIdx << "\n";
924 if (const TargetRegisterClass *DRC =
925 TII->getRegClass(MCID, MONum, TRI, *MF)) {
927 const TargetRegisterClass *SuperRC =
928 TRI->getLargestLegalSuperClass(RC);
930 report("No largest legal super class exists.", MO, MONum);
933 DRC = TRI->getMatchingSuperRegClass(SuperRC, DRC, SubIdx);
935 report("No matching super-reg register class.", MO, MONum);
939 if (!RC->hasSuperClassEq(DRC)) {
940 report("Illegal virtual register for instruction", MO, MONum);
941 *OS << "Expected a " << DRC->getName() << " register, but got a "
942 << RC->getName() << " register\n";
950 case MachineOperand::MO_RegisterMask:
951 regMasks.push_back(MO->getRegMask());
954 case MachineOperand::MO_MachineBasicBlock:
955 if (MI->isPHI() && !MO->getMBB()->isSuccessor(MI->getParent()))
956 report("PHI operand is not in the CFG", MO, MONum);
959 case MachineOperand::MO_FrameIndex:
960 if (LiveStks && LiveStks->hasInterval(MO->getIndex()) &&
961 LiveInts && !LiveInts->isNotInMIMap(MI)) {
962 LiveInterval &LI = LiveStks->getInterval(MO->getIndex());
963 SlotIndex Idx = LiveInts->getInstructionIndex(MI);
964 if (MI->mayLoad() && !LI.liveAt(Idx.getRegSlot(true))) {
965 report("Instruction loads from dead spill slot", MO, MONum);
966 *OS << "Live stack: " << LI << '\n';
968 if (MI->mayStore() && !LI.liveAt(Idx.getRegSlot())) {
969 report("Instruction stores to dead spill slot", MO, MONum);
970 *OS << "Live stack: " << LI << '\n';
980 void MachineVerifier::checkLiveness(const MachineOperand *MO, unsigned MONum) {
981 const MachineInstr *MI = MO->getParent();
982 const unsigned Reg = MO->getReg();
984 // Both use and def operands can read a register.
985 if (MO->readsReg()) {
986 regsLiveInButUnused.erase(Reg);
989 addRegWithSubRegs(regsKilled, Reg);
991 // Check that LiveVars knows this kill.
992 if (LiveVars && TargetRegisterInfo::isVirtualRegister(Reg) &&
994 LiveVariables::VarInfo &VI = LiveVars->getVarInfo(Reg);
995 if (std::find(VI.Kills.begin(), VI.Kills.end(), MI) == VI.Kills.end())
996 report("Kill missing from LiveVariables", MO, MONum);
999 // Check LiveInts liveness and kill.
1000 if (LiveInts && !LiveInts->isNotInMIMap(MI)) {
1001 SlotIndex UseIdx = LiveInts->getInstructionIndex(MI);
1002 // Check the cached regunit intervals.
1003 if (TargetRegisterInfo::isPhysicalRegister(Reg) && !isReserved(Reg)) {
1004 for (MCRegUnitIterator Units(Reg, TRI); Units.isValid(); ++Units) {
1005 if (const LiveInterval *LI = LiveInts->getCachedRegUnit(*Units)) {
1006 LiveRangeQuery LRQ(*LI, UseIdx);
1007 if (!LRQ.valueIn()) {
1008 report("No live range at use", MO, MONum);
1009 *OS << UseIdx << " is not live in " << PrintRegUnit(*Units, TRI)
1010 << ' ' << *LI << '\n';
1012 if (MO->isKill() && !LRQ.isKill()) {
1013 report("Live range continues after kill flag", MO, MONum);
1014 *OS << PrintRegUnit(*Units, TRI) << ' ' << *LI << '\n';
1020 if (TargetRegisterInfo::isVirtualRegister(Reg)) {
1021 if (LiveInts->hasInterval(Reg)) {
1022 // This is a virtual register interval.
1023 const LiveInterval &LI = LiveInts->getInterval(Reg);
1024 LiveRangeQuery LRQ(LI, UseIdx);
1025 if (!LRQ.valueIn()) {
1026 report("No live range at use", MO, MONum);
1027 *OS << UseIdx << " is not live in " << LI << '\n';
1029 // Check for extra kill flags.
1030 // Note that we allow missing kill flags for now.
1031 if (MO->isKill() && !LRQ.isKill()) {
1032 report("Live range continues after kill flag", MO, MONum);
1033 *OS << "Live range: " << LI << '\n';
1036 report("Virtual register has no live interval", MO, MONum);
1041 // Use of a dead register.
1042 if (!regsLive.count(Reg)) {
1043 if (TargetRegisterInfo::isPhysicalRegister(Reg)) {
1044 // Reserved registers may be used even when 'dead'.
1045 if (!isReserved(Reg))
1046 report("Using an undefined physical register", MO, MONum);
1047 } else if (MRI->def_empty(Reg)) {
1048 report("Reading virtual register without a def", MO, MONum);
1050 BBInfo &MInfo = MBBInfoMap[MI->getParent()];
1051 // We don't know which virtual registers are live in, so only complain
1052 // if vreg was killed in this MBB. Otherwise keep track of vregs that
1053 // must be live in. PHI instructions are handled separately.
1054 if (MInfo.regsKilled.count(Reg))
1055 report("Using a killed virtual register", MO, MONum);
1056 else if (!MI->isPHI())
1057 MInfo.vregsLiveIn.insert(std::make_pair(Reg, MI));
1063 // Register defined.
1064 // TODO: verify that earlyclobber ops are not used.
1066 addRegWithSubRegs(regsDead, Reg);
1068 addRegWithSubRegs(regsDefined, Reg);
1071 if (MRI->isSSA() && TargetRegisterInfo::isVirtualRegister(Reg) &&
1072 llvm::next(MRI->def_begin(Reg)) != MRI->def_end())
1073 report("Multiple virtual register defs in SSA form", MO, MONum);
1075 // Check LiveInts for a live range, but only for virtual registers.
1076 if (LiveInts && TargetRegisterInfo::isVirtualRegister(Reg) &&
1077 !LiveInts->isNotInMIMap(MI)) {
1078 SlotIndex DefIdx = LiveInts->getInstructionIndex(MI);
1079 DefIdx = DefIdx.getRegSlot(MO->isEarlyClobber());
1080 if (LiveInts->hasInterval(Reg)) {
1081 const LiveInterval &LI = LiveInts->getInterval(Reg);
1082 if (const VNInfo *VNI = LI.getVNInfoAt(DefIdx)) {
1083 assert(VNI && "NULL valno is not allowed");
1084 if (VNI->def != DefIdx) {
1085 report("Inconsistent valno->def", MO, MONum);
1086 *OS << "Valno " << VNI->id << " is not defined at "
1087 << DefIdx << " in " << LI << '\n';
1090 report("No live range at def", MO, MONum);
1091 *OS << DefIdx << " is not live in " << LI << '\n';
1094 report("Virtual register has no Live interval", MO, MONum);
1100 void MachineVerifier::visitMachineInstrAfter(const MachineInstr *MI) {
1103 // This function gets called after visiting all instructions in a bundle. The
1104 // argument points to the bundle header.
1105 // Normal stand-alone instructions are also considered 'bundles', and this
1106 // function is called for all of them.
1107 void MachineVerifier::visitMachineBundleAfter(const MachineInstr *MI) {
1108 BBInfo &MInfo = MBBInfoMap[MI->getParent()];
1109 set_union(MInfo.regsKilled, regsKilled);
1110 set_subtract(regsLive, regsKilled); regsKilled.clear();
1111 // Kill any masked registers.
1112 while (!regMasks.empty()) {
1113 const uint32_t *Mask = regMasks.pop_back_val();
1114 for (RegSet::iterator I = regsLive.begin(), E = regsLive.end(); I != E; ++I)
1115 if (TargetRegisterInfo::isPhysicalRegister(*I) &&
1116 MachineOperand::clobbersPhysReg(Mask, *I))
1117 regsDead.push_back(*I);
1119 set_subtract(regsLive, regsDead); regsDead.clear();
1120 set_union(regsLive, regsDefined); regsDefined.clear();
1124 MachineVerifier::visitMachineBasicBlockAfter(const MachineBasicBlock *MBB) {
1125 MBBInfoMap[MBB].regsLiveOut = regsLive;
1129 SlotIndex stop = Indexes->getMBBEndIdx(MBB);
1130 if (!(stop > lastIndex)) {
1131 report("Block ends before last instruction index", MBB);
1132 *OS << "Block ends at " << stop
1133 << " last instruction was at " << lastIndex << '\n';
1139 // Calculate the largest possible vregsPassed sets. These are the registers that
1140 // can pass through an MBB live, but may not be live every time. It is assumed
1141 // that all vregsPassed sets are empty before the call.
1142 void MachineVerifier::calcRegsPassed() {
1143 // First push live-out regs to successors' vregsPassed. Remember the MBBs that
1144 // have any vregsPassed.
1145 SmallPtrSet<const MachineBasicBlock*, 8> todo;
1146 for (MachineFunction::const_iterator MFI = MF->begin(), MFE = MF->end();
1147 MFI != MFE; ++MFI) {
1148 const MachineBasicBlock &MBB(*MFI);
1149 BBInfo &MInfo = MBBInfoMap[&MBB];
1150 if (!MInfo.reachable)
1152 for (MachineBasicBlock::const_succ_iterator SuI = MBB.succ_begin(),
1153 SuE = MBB.succ_end(); SuI != SuE; ++SuI) {
1154 BBInfo &SInfo = MBBInfoMap[*SuI];
1155 if (SInfo.addPassed(MInfo.regsLiveOut))
1160 // Iteratively push vregsPassed to successors. This will converge to the same
1161 // final state regardless of DenseSet iteration order.
1162 while (!todo.empty()) {
1163 const MachineBasicBlock *MBB = *todo.begin();
1165 BBInfo &MInfo = MBBInfoMap[MBB];
1166 for (MachineBasicBlock::const_succ_iterator SuI = MBB->succ_begin(),
1167 SuE = MBB->succ_end(); SuI != SuE; ++SuI) {
1170 BBInfo &SInfo = MBBInfoMap[*SuI];
1171 if (SInfo.addPassed(MInfo.vregsPassed))
1177 // Calculate the set of virtual registers that must be passed through each basic
1178 // block in order to satisfy the requirements of successor blocks. This is very
1179 // similar to calcRegsPassed, only backwards.
1180 void MachineVerifier::calcRegsRequired() {
1181 // First push live-in regs to predecessors' vregsRequired.
1182 SmallPtrSet<const MachineBasicBlock*, 8> todo;
1183 for (MachineFunction::const_iterator MFI = MF->begin(), MFE = MF->end();
1184 MFI != MFE; ++MFI) {
1185 const MachineBasicBlock &MBB(*MFI);
1186 BBInfo &MInfo = MBBInfoMap[&MBB];
1187 for (MachineBasicBlock::const_pred_iterator PrI = MBB.pred_begin(),
1188 PrE = MBB.pred_end(); PrI != PrE; ++PrI) {
1189 BBInfo &PInfo = MBBInfoMap[*PrI];
1190 if (PInfo.addRequired(MInfo.vregsLiveIn))
1195 // Iteratively push vregsRequired to predecessors. This will converge to the
1196 // same final state regardless of DenseSet iteration order.
1197 while (!todo.empty()) {
1198 const MachineBasicBlock *MBB = *todo.begin();
1200 BBInfo &MInfo = MBBInfoMap[MBB];
1201 for (MachineBasicBlock::const_pred_iterator PrI = MBB->pred_begin(),
1202 PrE = MBB->pred_end(); PrI != PrE; ++PrI) {
1205 BBInfo &SInfo = MBBInfoMap[*PrI];
1206 if (SInfo.addRequired(MInfo.vregsRequired))
1212 // Check PHI instructions at the beginning of MBB. It is assumed that
1213 // calcRegsPassed has been run so BBInfo::isLiveOut is valid.
1214 void MachineVerifier::checkPHIOps(const MachineBasicBlock *MBB) {
1215 SmallPtrSet<const MachineBasicBlock*, 8> seen;
1216 for (MachineBasicBlock::const_iterator BBI = MBB->begin(), BBE = MBB->end();
1217 BBI != BBE && BBI->isPHI(); ++BBI) {
1220 for (unsigned i = 1, e = BBI->getNumOperands(); i != e; i += 2) {
1221 unsigned Reg = BBI->getOperand(i).getReg();
1222 const MachineBasicBlock *Pre = BBI->getOperand(i + 1).getMBB();
1223 if (!Pre->isSuccessor(MBB))
1226 BBInfo &PrInfo = MBBInfoMap[Pre];
1227 if (PrInfo.reachable && !PrInfo.isLiveOut(Reg))
1228 report("PHI operand is not live-out from predecessor",
1229 &BBI->getOperand(i), i);
1232 // Did we see all predecessors?
1233 for (MachineBasicBlock::const_pred_iterator PrI = MBB->pred_begin(),
1234 PrE = MBB->pred_end(); PrI != PrE; ++PrI) {
1235 if (!seen.count(*PrI)) {
1236 report("Missing PHI operand", BBI);
1237 *OS << "BB#" << (*PrI)->getNumber()
1238 << " is a predecessor according to the CFG.\n";
1244 void MachineVerifier::visitMachineFunctionAfter() {
1247 for (MachineFunction::const_iterator MFI = MF->begin(), MFE = MF->end();
1248 MFI != MFE; ++MFI) {
1249 BBInfo &MInfo = MBBInfoMap[MFI];
1251 // Skip unreachable MBBs.
1252 if (!MInfo.reachable)
1258 // Now check liveness info if available
1261 // Check for killed virtual registers that should be live out.
1262 for (MachineFunction::const_iterator MFI = MF->begin(), MFE = MF->end();
1263 MFI != MFE; ++MFI) {
1264 BBInfo &MInfo = MBBInfoMap[MFI];
1265 for (RegSet::iterator
1266 I = MInfo.vregsRequired.begin(), E = MInfo.vregsRequired.end(); I != E;
1268 if (MInfo.regsKilled.count(*I)) {
1269 report("Virtual register killed in block, but needed live out.", MFI);
1270 *OS << "Virtual register " << PrintReg(*I)
1271 << " is used after the block.\n";
1276 BBInfo &MInfo = MBBInfoMap[&MF->front()];
1277 for (RegSet::iterator
1278 I = MInfo.vregsRequired.begin(), E = MInfo.vregsRequired.end(); I != E;
1280 report("Virtual register def doesn't dominate all uses.",
1281 MRI->getVRegDef(*I));
1285 verifyLiveVariables();
1287 verifyLiveIntervals();
1290 void MachineVerifier::verifyLiveVariables() {
1291 assert(LiveVars && "Don't call verifyLiveVariables without LiveVars");
1292 for (unsigned i = 0, e = MRI->getNumVirtRegs(); i != e; ++i) {
1293 unsigned Reg = TargetRegisterInfo::index2VirtReg(i);
1294 LiveVariables::VarInfo &VI = LiveVars->getVarInfo(Reg);
1295 for (MachineFunction::const_iterator MFI = MF->begin(), MFE = MF->end();
1296 MFI != MFE; ++MFI) {
1297 BBInfo &MInfo = MBBInfoMap[MFI];
1299 // Our vregsRequired should be identical to LiveVariables' AliveBlocks
1300 if (MInfo.vregsRequired.count(Reg)) {
1301 if (!VI.AliveBlocks.test(MFI->getNumber())) {
1302 report("LiveVariables: Block missing from AliveBlocks", MFI);
1303 *OS << "Virtual register " << PrintReg(Reg)
1304 << " must be live through the block.\n";
1307 if (VI.AliveBlocks.test(MFI->getNumber())) {
1308 report("LiveVariables: Block should not be in AliveBlocks", MFI);
1309 *OS << "Virtual register " << PrintReg(Reg)
1310 << " is not needed live through the block.\n";
1317 void MachineVerifier::verifyLiveIntervals() {
1318 assert(LiveInts && "Don't call verifyLiveIntervals without LiveInts");
1319 for (unsigned i = 0, e = MRI->getNumVirtRegs(); i != e; ++i) {
1320 unsigned Reg = TargetRegisterInfo::index2VirtReg(i);
1322 // Spilling and splitting may leave unused registers around. Skip them.
1323 if (MRI->reg_nodbg_empty(Reg))
1326 if (!LiveInts->hasInterval(Reg)) {
1327 report("Missing live interval for virtual register", MF);
1328 *OS << PrintReg(Reg, TRI) << " still has defs or uses\n";
1332 const LiveInterval &LI = LiveInts->getInterval(Reg);
1333 assert(Reg == LI.reg && "Invalid reg to interval mapping");
1334 verifyLiveInterval(LI);
1337 // Verify all the cached regunit intervals.
1338 for (unsigned i = 0, e = TRI->getNumRegUnits(); i != e; ++i)
1339 if (const LiveInterval *LI = LiveInts->getCachedRegUnit(i))
1340 verifyLiveInterval(*LI);
1343 void MachineVerifier::verifyLiveIntervalValue(const LiveInterval &LI,
1345 if (VNI->isUnused())
1348 const VNInfo *DefVNI = LI.getVNInfoAt(VNI->def);
1351 report("Valno not live at def and not marked unused", MF, LI);
1352 *OS << "Valno #" << VNI->id << '\n';
1356 if (DefVNI != VNI) {
1357 report("Live range at def has different valno", MF, LI);
1358 *OS << "Valno #" << VNI->id << " is defined at " << VNI->def
1359 << " where valno #" << DefVNI->id << " is live\n";
1363 const MachineBasicBlock *MBB = LiveInts->getMBBFromIndex(VNI->def);
1365 report("Invalid definition index", MF, LI);
1366 *OS << "Valno #" << VNI->id << " is defined at " << VNI->def
1367 << " in " << LI << '\n';
1371 if (VNI->isPHIDef()) {
1372 if (VNI->def != LiveInts->getMBBStartIdx(MBB)) {
1373 report("PHIDef value is not defined at MBB start", MBB, LI);
1374 *OS << "Valno #" << VNI->id << " is defined at " << VNI->def
1375 << ", not at the beginning of BB#" << MBB->getNumber() << '\n';
1381 const MachineInstr *MI = LiveInts->getInstructionFromIndex(VNI->def);
1383 report("No instruction at def index", MBB, LI);
1384 *OS << "Valno #" << VNI->id << " is defined at " << VNI->def << '\n';
1388 bool hasDef = false;
1389 bool isEarlyClobber = false;
1390 for (ConstMIBundleOperands MOI(MI); MOI.isValid(); ++MOI) {
1391 if (!MOI->isReg() || !MOI->isDef())
1393 if (TargetRegisterInfo::isVirtualRegister(LI.reg)) {
1394 if (MOI->getReg() != LI.reg)
1397 if (!TargetRegisterInfo::isPhysicalRegister(MOI->getReg()) ||
1398 !TRI->hasRegUnit(MOI->getReg(), LI.reg))
1402 if (MOI->isEarlyClobber())
1403 isEarlyClobber = true;
1407 report("Defining instruction does not modify register", MI);
1408 *OS << "Valno #" << VNI->id << " in " << LI << '\n';
1411 // Early clobber defs begin at USE slots, but other defs must begin at
1413 if (isEarlyClobber) {
1414 if (!VNI->def.isEarlyClobber()) {
1415 report("Early clobber def must be at an early-clobber slot", MBB, LI);
1416 *OS << "Valno #" << VNI->id << " is defined at " << VNI->def << '\n';
1418 } else if (!VNI->def.isRegister()) {
1419 report("Non-PHI, non-early clobber def must be at a register slot",
1421 *OS << "Valno #" << VNI->id << " is defined at " << VNI->def << '\n';
1426 MachineVerifier::verifyLiveIntervalSegment(const LiveInterval &LI,
1427 LiveInterval::const_iterator I) {
1428 const VNInfo *VNI = I->valno;
1429 assert(VNI && "Live range has no valno");
1431 if (VNI->id >= LI.getNumValNums() || VNI != LI.getValNumInfo(VNI->id)) {
1432 report("Foreign valno in live range", MF, LI);
1433 *OS << *I << " has a bad valno\n";
1436 if (VNI->isUnused()) {
1437 report("Live range valno is marked unused", MF, LI);
1441 const MachineBasicBlock *MBB = LiveInts->getMBBFromIndex(I->start);
1443 report("Bad start of live segment, no basic block", MF, LI);
1447 SlotIndex MBBStartIdx = LiveInts->getMBBStartIdx(MBB);
1448 if (I->start != MBBStartIdx && I->start != VNI->def) {
1449 report("Live segment must begin at MBB entry or valno def", MBB, LI);
1453 const MachineBasicBlock *EndMBB =
1454 LiveInts->getMBBFromIndex(I->end.getPrevSlot());
1456 report("Bad end of live segment, no basic block", MF, LI);
1461 // No more checks for live-out segments.
1462 if (I->end == LiveInts->getMBBEndIdx(EndMBB))
1465 // RegUnit intervals are allowed dead phis.
1466 if (!TargetRegisterInfo::isVirtualRegister(LI.reg) && VNI->isPHIDef() &&
1467 I->start == VNI->def && I->end == VNI->def.getDeadSlot())
1470 // The live segment is ending inside EndMBB
1471 const MachineInstr *MI =
1472 LiveInts->getInstructionFromIndex(I->end.getPrevSlot());
1474 report("Live segment doesn't end at a valid instruction", EndMBB, LI);
1479 // The block slot must refer to a basic block boundary.
1480 if (I->end.isBlock()) {
1481 report("Live segment ends at B slot of an instruction", EndMBB, LI);
1485 if (I->end.isDead()) {
1486 // Segment ends on the dead slot.
1487 // That means there must be a dead def.
1488 if (!SlotIndex::isSameInstr(I->start, I->end)) {
1489 report("Live segment ending at dead slot spans instructions", EndMBB, LI);
1494 // A live segment can only end at an early-clobber slot if it is being
1495 // redefined by an early-clobber def.
1496 if (I->end.isEarlyClobber()) {
1497 if (I+1 == LI.end() || (I+1)->start != I->end) {
1498 report("Live segment ending at early clobber slot must be "
1499 "redefined by an EC def in the same instruction", EndMBB, LI);
1504 // The following checks only apply to virtual registers. Physreg liveness
1505 // is too weird to check.
1506 if (TargetRegisterInfo::isVirtualRegister(LI.reg)) {
1507 // A live range can end with either a redefinition, a kill flag on a
1508 // use, or a dead flag on a def.
1509 bool hasRead = false;
1510 bool hasDeadDef = false;
1511 for (ConstMIBundleOperands MOI(MI); MOI.isValid(); ++MOI) {
1512 if (!MOI->isReg() || MOI->getReg() != LI.reg)
1514 if (MOI->readsReg())
1516 if (MOI->isDef() && MOI->isDead())
1520 if (I->end.isDead()) {
1522 report("Instruction doesn't have a dead def operand", MI);
1524 *OS << " in " << LI << '\n';
1528 report("Instruction ending live range doesn't read the register", MI);
1529 *OS << *I << " in " << LI << '\n';
1534 // Now check all the basic blocks in this live segment.
1535 MachineFunction::const_iterator MFI = MBB;
1536 // Is this live range the beginning of a non-PHIDef VN?
1537 if (I->start == VNI->def && !VNI->isPHIDef()) {
1538 // Not live-in to any blocks.
1545 assert(LiveInts->isLiveInToMBB(LI, MFI));
1546 // We don't know how to track physregs into a landing pad.
1547 if (!TargetRegisterInfo::isVirtualRegister(LI.reg) &&
1548 MFI->isLandingPad()) {
1549 if (&*MFI == EndMBB)
1555 // Is VNI a PHI-def in the current block?
1556 bool IsPHI = VNI->isPHIDef() &&
1557 VNI->def == LiveInts->getMBBStartIdx(MFI);
1559 // Check that VNI is live-out of all predecessors.
1560 for (MachineBasicBlock::const_pred_iterator PI = MFI->pred_begin(),
1561 PE = MFI->pred_end(); PI != PE; ++PI) {
1562 SlotIndex PEnd = LiveInts->getMBBEndIdx(*PI);
1563 const VNInfo *PVNI = LI.getVNInfoBefore(PEnd);
1565 // All predecessors must have a live-out value.
1567 report("Register not marked live out of predecessor", *PI, LI);
1568 *OS << "Valno #" << VNI->id << " live into BB#" << MFI->getNumber()
1569 << '@' << LiveInts->getMBBStartIdx(MFI) << ", not live before "
1574 // Only PHI-defs can take different predecessor values.
1575 if (!IsPHI && PVNI != VNI) {
1576 report("Different value live out of predecessor", *PI, LI);
1577 *OS << "Valno #" << PVNI->id << " live out of BB#"
1578 << (*PI)->getNumber() << '@' << PEnd
1579 << "\nValno #" << VNI->id << " live into BB#" << MFI->getNumber()
1580 << '@' << LiveInts->getMBBStartIdx(MFI) << '\n';
1583 if (&*MFI == EndMBB)
1589 void MachineVerifier::verifyLiveInterval(const LiveInterval &LI) {
1590 for (LiveInterval::const_vni_iterator I = LI.vni_begin(), E = LI.vni_end();
1592 verifyLiveIntervalValue(LI, *I);
1594 for (LiveInterval::const_iterator I = LI.begin(), E = LI.end(); I!=E; ++I)
1595 verifyLiveIntervalSegment(LI, I);
1597 // Check the LI only has one connected component.
1598 if (TargetRegisterInfo::isVirtualRegister(LI.reg)) {
1599 ConnectedVNInfoEqClasses ConEQ(*LiveInts);
1600 unsigned NumComp = ConEQ.Classify(&LI);
1602 report("Multiple connected components in live interval", MF, LI);
1603 for (unsigned comp = 0; comp != NumComp; ++comp) {
1604 *OS << comp << ": valnos";
1605 for (LiveInterval::const_vni_iterator I = LI.vni_begin(),
1606 E = LI.vni_end(); I!=E; ++I)
1607 if (comp == ConEQ.getEqClass(*I))
1608 *OS << ' ' << (*I)->id;
1616 // FrameSetup and FrameDestroy can have zero adjustment, so using a single
1617 // integer, we can't tell whether it is a FrameSetup or FrameDestroy if the
1619 // We use a bool plus an integer to capture the stack state.
1620 struct StackStateOfBB {
1621 StackStateOfBB() : EntryValue(0), ExitValue(0), EntryIsSetup(false),
1622 ExitIsSetup(false) { }
1623 StackStateOfBB(int EntryVal, int ExitVal, bool EntrySetup, bool ExitSetup) :
1624 EntryValue(EntryVal), ExitValue(ExitVal), EntryIsSetup(EntrySetup),
1625 ExitIsSetup(ExitSetup) { }
1626 // Can be negative, which means we are setting up a frame.
1634 /// Make sure on every path through the CFG, a FrameSetup <n> is always followed
1635 /// by a FrameDestroy <n>, stack adjustments are identical on all
1636 /// CFG edges to a merge point, and frame is destroyed at end of a return block.
1637 void MachineVerifier::verifyStackFrame() {
1638 int FrameSetupOpcode = TII->getCallFrameSetupOpcode();
1639 int FrameDestroyOpcode = TII->getCallFrameDestroyOpcode();
1641 SmallVector<StackStateOfBB, 8> SPState;
1642 SPState.resize(MF->getNumBlockIDs());
1643 SmallPtrSet<const MachineBasicBlock*, 8> Reachable;
1645 // Visit the MBBs in DFS order.
1646 for (df_ext_iterator<const MachineFunction*,
1647 SmallPtrSet<const MachineBasicBlock*, 8> >
1648 DFI = df_ext_begin(MF, Reachable), DFE = df_ext_end(MF, Reachable);
1649 DFI != DFE; ++DFI) {
1650 const MachineBasicBlock *MBB = *DFI;
1652 StackStateOfBB BBState;
1653 // Check the exit state of the DFS stack predecessor.
1654 if (DFI.getPathLength() >= 2) {
1655 const MachineBasicBlock *StackPred = DFI.getPath(DFI.getPathLength() - 2);
1656 assert(Reachable.count(StackPred) &&
1657 "DFS stack predecessor is already visited.\n");
1658 BBState.EntryValue = SPState[StackPred->getNumber()].ExitValue;
1659 BBState.EntryIsSetup = SPState[StackPred->getNumber()].ExitIsSetup;
1660 BBState.ExitValue = BBState.EntryValue;
1661 BBState.ExitIsSetup = BBState.EntryIsSetup;
1664 // Update stack state by checking contents of MBB.
1665 for (MachineBasicBlock::const_iterator I = MBB->begin(), E = MBB->end();
1667 if (I->getOpcode() == FrameSetupOpcode) {
1668 // The first operand of a FrameOpcode should be i32.
1669 int Size = I->getOperand(0).getImm();
1671 "Value should be non-negative in FrameSetup and FrameDestroy.\n");
1673 if (BBState.ExitIsSetup)
1674 report("FrameSetup is after another FrameSetup", I);
1675 BBState.ExitValue -= Size;
1676 BBState.ExitIsSetup = true;
1679 if (I->getOpcode() == FrameDestroyOpcode) {
1680 // The first operand of a FrameOpcode should be i32.
1681 int Size = I->getOperand(0).getImm();
1683 "Value should be non-negative in FrameSetup and FrameDestroy.\n");
1685 if (!BBState.ExitIsSetup)
1686 report("FrameDestroy is not after a FrameSetup", I);
1687 int AbsSPAdj = BBState.ExitValue < 0 ? -BBState.ExitValue :
1689 if (BBState.ExitIsSetup && AbsSPAdj != Size) {
1690 report("FrameDestroy <n> is after FrameSetup <m>", I);
1691 *OS << "FrameDestroy <" << Size << "> is after FrameSetup <"
1692 << AbsSPAdj << ">.\n";
1694 BBState.ExitValue += Size;
1695 BBState.ExitIsSetup = false;
1698 SPState[MBB->getNumber()] = BBState;
1700 // Make sure the exit state of any predecessor is consistent with the entry
1702 for (MachineBasicBlock::const_pred_iterator I = MBB->pred_begin(),
1703 E = MBB->pred_end(); I != E; ++I) {
1704 if (Reachable.count(*I) &&
1705 (SPState[(*I)->getNumber()].ExitValue != BBState.EntryValue ||
1706 SPState[(*I)->getNumber()].ExitIsSetup != BBState.EntryIsSetup)) {
1707 report("The exit stack state of a predecessor is inconsistent.", MBB);
1708 *OS << "Predecessor BB#" << (*I)->getNumber() << " has exit state ("
1709 << SPState[(*I)->getNumber()].ExitValue << ", "
1710 << SPState[(*I)->getNumber()].ExitIsSetup
1711 << "), while BB#" << MBB->getNumber() << " has entry state ("
1712 << BBState.EntryValue << ", " << BBState.EntryIsSetup << ").\n";
1716 // Make sure the entry state of any successor is consistent with the exit
1718 for (MachineBasicBlock::const_succ_iterator I = MBB->succ_begin(),
1719 E = MBB->succ_end(); I != E; ++I) {
1720 if (Reachable.count(*I) &&
1721 (SPState[(*I)->getNumber()].EntryValue != BBState.ExitValue ||
1722 SPState[(*I)->getNumber()].EntryIsSetup != BBState.ExitIsSetup)) {
1723 report("The entry stack state of a successor is inconsistent.", MBB);
1724 *OS << "Successor BB#" << (*I)->getNumber() << " has entry state ("
1725 << SPState[(*I)->getNumber()].EntryValue << ", "
1726 << SPState[(*I)->getNumber()].EntryIsSetup
1727 << "), while BB#" << MBB->getNumber() << " has exit state ("
1728 << BBState.ExitValue << ", " << BBState.ExitIsSetup << ").\n";
1732 // Make sure a basic block with return ends with zero stack adjustment.
1733 if (!MBB->empty() && MBB->back().isReturn()) {
1734 if (BBState.ExitIsSetup)
1735 report("A return block ends with a FrameSetup.", MBB);
1736 if (BBState.ExitValue)
1737 report("A return block ends with a nonzero stack adjustment.", MBB);