// the verifier errors.
//===----------------------------------------------------------------------===//
-#include "llvm/Instructions.h"
-#include "llvm/Function.h"
+#include "llvm/CodeGen/Passes.h"
+#include "llvm/ADT/DenseSet.h"
+#include "llvm/ADT/DepthFirstIterator.h"
+#include "llvm/ADT/SetOperations.h"
+#include "llvm/ADT/SmallVector.h"
#include "llvm/CodeGen/LiveIntervalAnalysis.h"
-#include "llvm/CodeGen/LiveVariables.h"
#include "llvm/CodeGen/LiveStackAnalysis.h"
-#include "llvm/CodeGen/MachineInstrBundle.h"
-#include "llvm/CodeGen/MachineFunctionPass.h"
+#include "llvm/CodeGen/LiveVariables.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
+#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/MachineMemOperand.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
-#include "llvm/CodeGen/Passes.h"
+#include "llvm/IR/BasicBlock.h"
+#include "llvm/IR/InlineAsm.h"
+#include "llvm/IR/Instructions.h"
#include "llvm/MC/MCAsmInfo.h"
-#include "llvm/Target/TargetMachine.h"
-#include "llvm/Target/TargetRegisterInfo.h"
-#include "llvm/Target/TargetInstrInfo.h"
-#include "llvm/ADT/DenseSet.h"
-#include "llvm/ADT/SetOperations.h"
-#include "llvm/ADT/SmallVector.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/FileSystem.h"
+#include "llvm/Support/Format.h"
#include "llvm/Support/raw_ostream.h"
+#include "llvm/Target/TargetInstrInfo.h"
+#include "llvm/Target/TargetMachine.h"
+#include "llvm/Target/TargetRegisterInfo.h"
+#include "llvm/Target/TargetSubtargetInfo.h"
using namespace llvm;
namespace {
typedef SmallVector<const uint32_t*, 4> RegMaskVector;
typedef DenseSet<unsigned> RegSet;
typedef DenseMap<unsigned, const MachineInstr*> RegMap;
+ typedef SmallPtrSet<const MachineBasicBlock*, 8> BlockSet;
const MachineInstr *FirstTerminator;
+ BlockSet FunctionBlocks;
BitVector regsReserved;
- BitVector regsAllocatable;
RegSet regsLive;
RegVector regsDefined, regsDead, regsKilled;
RegMaskVector regMasks;
// block. This set is disjoint from regsLiveOut.
RegSet vregsRequired;
+ // Set versions of block's predecessor and successor lists.
+ BlockSet Preds, Succs;
+
BBInfo() : reachable(false) {}
// Add register to vregsPassed if it belongs there. Return true if
}
bool isAllocatable(unsigned Reg) {
- return Reg < regsAllocatable.size() && regsAllocatable.test(Reg);
+ return Reg < TRI->getNumRegs() && MRI->isAllocatable(Reg);
}
// Analysis information if available
void report(const char *msg, const MachineBasicBlock *MBB);
void report(const char *msg, const MachineInstr *MI);
void report(const char *msg, const MachineOperand *MO, unsigned MONum);
+ void report(const char *msg, const MachineFunction *MF,
+ const LiveInterval &LI);
+ void report(const char *msg, const MachineBasicBlock *MBB,
+ const LiveInterval &LI);
+ void report(const char *msg, const MachineFunction *MF,
+ const LiveRange &LR, unsigned Reg, unsigned LaneMask);
+ void report(const char *msg, const MachineBasicBlock *MBB,
+ const LiveRange &LR, unsigned Reg, unsigned LaneMask);
+
+ void verifyInlineAsm(const MachineInstr *MI);
void checkLiveness(const MachineOperand *MO, unsigned MONum);
void markReachable(const MachineBasicBlock *MBB);
void calcRegsRequired();
void verifyLiveVariables();
void verifyLiveIntervals();
+ void verifyLiveInterval(const LiveInterval&);
+ void verifyLiveRangeValue(const LiveRange&, const VNInfo*, unsigned,
+ unsigned);
+ void verifyLiveRangeSegment(const LiveRange&,
+ const LiveRange::const_iterator I, unsigned,
+ unsigned);
+ void verifyLiveRange(const LiveRange&, unsigned, unsigned LaneMask = 0);
+
+ void verifyStackFrame();
};
struct MachineVerifierPass : public MachineFunctionPass {
static char ID; // Pass ID, replacement for typeid
- const char *const Banner;
+ const std::string Banner;
- MachineVerifierPass(const char *b = 0)
- : MachineFunctionPass(ID), Banner(b) {
+ MachineVerifierPass(const std::string &banner = nullptr)
+ : MachineFunctionPass(ID), Banner(banner) {
initializeMachineVerifierPassPass(*PassRegistry::getPassRegistry());
}
- void getAnalysisUsage(AnalysisUsage &AU) const {
+ void getAnalysisUsage(AnalysisUsage &AU) const override {
AU.setPreservesAll();
MachineFunctionPass::getAnalysisUsage(AU);
}
- bool runOnMachineFunction(MachineFunction &MF) {
- MF.verify(this, Banner);
+ bool runOnMachineFunction(MachineFunction &MF) override {
+ MF.verify(this, Banner.c_str());
return false;
}
};
INITIALIZE_PASS(MachineVerifierPass, "machineverifier",
"Verify generated machine code", false, false)
-FunctionPass *llvm::createMachineVerifierPass(const char *Banner) {
+FunctionPass *llvm::createMachineVerifierPass(const std::string &Banner) {
return new MachineVerifierPass(Banner);
}
}
bool MachineVerifier::runOnMachineFunction(MachineFunction &MF) {
- raw_ostream *OutFile = 0;
+ raw_ostream *OutFile = nullptr;
if (OutFileName) {
- std::string ErrorInfo;
- OutFile = new raw_fd_ostream(OutFileName, ErrorInfo,
- raw_fd_ostream::F_Append);
- if (!ErrorInfo.empty()) {
- errs() << "Error opening '" << OutFileName << "': " << ErrorInfo << '\n';
+ std::error_code EC;
+ OutFile = new raw_fd_ostream(OutFileName, EC,
+ sys::fs::F_Append | sys::fs::F_Text);
+ if (EC) {
+ errs() << "Error opening '" << OutFileName << "': " << EC.message()
+ << '\n';
exit(1);
}
this->MF = &MF;
TM = &MF.getTarget();
- TII = TM->getInstrInfo();
- TRI = TM->getRegisterInfo();
+ TII = MF.getSubtarget().getInstrInfo();
+ TRI = MF.getSubtarget().getRegisterInfo();
MRI = &MF.getRegInfo();
- LiveVars = NULL;
- LiveInts = NULL;
- LiveStks = NULL;
- Indexes = NULL;
+ LiveVars = nullptr;
+ LiveInts = nullptr;
+ LiveStks = nullptr;
+ Indexes = nullptr;
if (PASS) {
LiveInts = PASS->getAnalysisIfAvailable<LiveIntervals>();
// We don't want to verify LiveVariables if LiveIntervals is available.
MFI!=MFE; ++MFI) {
visitMachineBasicBlockBefore(MFI);
// Keep track of the current bundle header.
- const MachineInstr *CurBundle = 0;
+ const MachineInstr *CurBundle = nullptr;
+ // Do we expect the next instruction to be part of the same bundle?
+ bool InBundle = false;
+
for (MachineBasicBlock::const_instr_iterator MBBI = MFI->instr_begin(),
MBBE = MFI->instr_end(); MBBI != MBBE; ++MBBI) {
if (MBBI->getParent() != MFI) {
*OS << "Instruction: " << *MBBI;
continue;
}
+
+ // Check for consistent bundle flags.
+ if (InBundle && !MBBI->isBundledWithPred())
+ report("Missing BundledPred flag, "
+ "BundledSucc was set on predecessor", MBBI);
+ if (!InBundle && MBBI->isBundledWithPred())
+ report("BundledPred flag is set, "
+ "but BundledSucc not set on predecessor", MBBI);
+
// Is this a bundle header?
if (!MBBI->isInsideBundle()) {
if (CurBundle)
for (unsigned I = 0, E = MBBI->getNumOperands(); I != E; ++I)
visitMachineOperand(&MBBI->getOperand(I), I);
visitMachineInstrAfter(MBBI);
+
+ // Was this the last bundled instruction?
+ InBundle = MBBI->isBundledWithSucc();
}
if (CurBundle)
visitMachineBundleAfter(CurBundle);
+ if (InBundle)
+ report("BundledSucc flag set on last instruction in block", &MFI->back());
visitMachineBasicBlockAfter(MFI);
}
visitMachineFunctionAfter();
MF->print(*OS, Indexes);
}
*OS << "*** Bad machine code: " << msg << " ***\n"
- << "- function: " << MF->getFunction()->getName() << "\n";
+ << "- function: " << MF->getName() << "\n";
}
void MachineVerifier::report(const char *msg, const MachineBasicBlock *MBB) {
assert(MBB);
report(msg, MBB->getParent());
- *OS << "- basic block: " << MBB->getName()
- << " " << (void*)MBB
- << " (BB#" << MBB->getNumber() << ")";
+ *OS << "- basic block: BB#" << MBB->getNumber()
+ << ' ' << MBB->getName()
+ << " (" << (const void*)MBB << ')';
if (Indexes)
*OS << " [" << Indexes->getMBBStartIdx(MBB)
<< ';' << Indexes->getMBBEndIdx(MBB) << ')';
*OS << "\n";
}
+void MachineVerifier::report(const char *msg, const MachineFunction *MF,
+ const LiveInterval &LI) {
+ report(msg, MF);
+ *OS << "- interval: " << LI << '\n';
+}
+
+void MachineVerifier::report(const char *msg, const MachineBasicBlock *MBB,
+ const LiveInterval &LI) {
+ report(msg, MBB);
+ *OS << "- interval: " << LI << '\n';
+}
+
+void MachineVerifier::report(const char *msg, const MachineBasicBlock *MBB,
+ const LiveRange &LR, unsigned Reg,
+ unsigned LaneMask) {
+ report(msg, MBB);
+ *OS << "- liverange: " << LR << '\n';
+ *OS << "- register: " << PrintReg(Reg, TRI) << '\n';
+ if (LaneMask != 0)
+ *OS << "- lanemask: " << format("%04X\n", LaneMask);
+}
+
+void MachineVerifier::report(const char *msg, const MachineFunction *MF,
+ const LiveRange &LR, unsigned Reg,
+ unsigned LaneMask) {
+ report(msg, MF);
+ *OS << "- liverange: " << LR << '\n';
+ *OS << "- register: " << PrintReg(Reg, TRI) << '\n';
+ if (LaneMask != 0)
+ *OS << "- lanemask: " << format("%04X\n", LaneMask);
+}
+
void MachineVerifier::markReachable(const MachineBasicBlock *MBB) {
BBInfo &MInfo = MBBInfoMap[MBB];
if (!MInfo.reachable) {
void MachineVerifier::visitMachineFunctionBefore() {
lastIndex = SlotIndex();
- regsReserved = TRI->getReservedRegs(*MF);
+ regsReserved = MRI->getReservedRegs();
// A sub-register of a reserved register is also reserved
for (int Reg = regsReserved.find_first(); Reg>=0;
}
}
- regsAllocatable = TRI->getAllocatableSet(*MF);
-
markReachable(&MF->front());
+
+ // Build a set of the basic blocks in the function.
+ FunctionBlocks.clear();
+ for (const auto &MBB : *MF) {
+ FunctionBlocks.insert(&MBB);
+ BBInfo &MInfo = MBBInfoMap[&MBB];
+
+ MInfo.Preds.insert(MBB.pred_begin(), MBB.pred_end());
+ if (MInfo.Preds.size() != MBB.pred_size())
+ report("MBB has duplicate entries in its predecessor list.", &MBB);
+
+ MInfo.Succs.insert(MBB.succ_begin(), MBB.succ_end());
+ if (MInfo.Succs.size() != MBB.succ_size())
+ report("MBB has duplicate entries in its successor list.", &MBB);
+ }
+
+ // Check that the register use lists are sane.
+ MRI->verifyUseLists();
+
+ verifyStackFrame();
}
// Does iterator point to a and b as the first two elements?
void
MachineVerifier::visitMachineBasicBlockBefore(const MachineBasicBlock *MBB) {
- FirstTerminator = 0;
+ FirstTerminator = nullptr;
if (MRI->isSSA()) {
// If this block has allocatable physical registers live-in, check that
E = MBB->succ_end(); I != E; ++I) {
if ((*I)->isLandingPad())
LandingPadSuccs.insert(*I);
+ if (!FunctionBlocks.count(*I))
+ report("MBB has successor that isn't part of the function.", MBB);
+ if (!MBBInfoMap[*I].Preds.count(MBB)) {
+ report("Inconsistent CFG", MBB);
+ *OS << "MBB is not in the predecessor list of the successor BB#"
+ << (*I)->getNumber() << ".\n";
+ }
+ }
+
+ // Check the predecessor list.
+ for (MachineBasicBlock::const_pred_iterator I = MBB->pred_begin(),
+ E = MBB->pred_end(); I != E; ++I) {
+ if (!FunctionBlocks.count(*I))
+ report("MBB has predecessor that isn't part of the function.", MBB);
+ if (!MBBInfoMap[*I].Succs.count(MBB)) {
+ report("Inconsistent CFG", MBB);
+ *OS << "MBB is not in the successor list of the predecessor BB#"
+ << (*I)->getNumber() << ".\n";
+ }
}
const MCAsmInfo *AsmInfo = TM->getMCAsmInfo();
report("MBB has more than one landing pad successor", MBB);
// Call AnalyzeBranch. If it succeeds, there several more conditions to check.
- MachineBasicBlock *TBB = 0, *FBB = 0;
+ MachineBasicBlock *TBB = nullptr, *FBB = nullptr;
SmallVector<MachineOperand, 4> Cond;
if (!TII->AnalyzeBranch(*const_cast<MachineBasicBlock *>(MBB),
TBB, FBB, Cond)) {
report("MBB exits via unconditional fall-through but its successor "
"differs from its CFG successor!", MBB);
}
- if (!MBB->empty() && getBundleStart(&MBB->back())->isBarrier() &&
- !TII->isPredicated(getBundleStart(&MBB->back()))) {
+ if (!MBB->empty() && MBB->back().isBarrier() &&
+ !TII->isPredicated(&MBB->back())) {
report("MBB exits via unconditional fall-through but ends with a "
"barrier instruction!", MBB);
}
}
} else if (TBB && !FBB && Cond.empty()) {
// Block unconditionally branches somewhere.
- if (MBB->succ_size() != 1+LandingPadSuccs.size()) {
+ // If the block has exactly one successor, that happens to be a
+ // landingpad, accept it as valid control flow.
+ if (MBB->succ_size() != 1+LandingPadSuccs.size() &&
+ (MBB->succ_size() != 1 || LandingPadSuccs.size() != 1 ||
+ *MBB->succ_begin() != *LandingPadSuccs.begin())) {
report("MBB exits via unconditional branch but doesn't have "
"exactly one CFG successor!", MBB);
} else if (!MBB->isSuccessor(TBB)) {
if (MBB->empty()) {
report("MBB exits via unconditional branch but doesn't contain "
"any instructions!", MBB);
- } else if (!getBundleStart(&MBB->back())->isBarrier()) {
+ } else if (!MBB->back().isBarrier()) {
report("MBB exits via unconditional branch but doesn't end with a "
"barrier instruction!", MBB);
- } else if (!getBundleStart(&MBB->back())->isTerminator()) {
+ } else if (!MBB->back().isTerminator()) {
report("MBB exits via unconditional branch but the branch isn't a "
"terminator instruction!", MBB);
}
++MBBI;
if (MBBI == MF->end()) {
report("MBB conditionally falls through out of function!", MBB);
- } if (MBB->succ_size() != 2) {
+ } else if (MBB->succ_size() == 1) {
+ // A conditional branch with only one successor is weird, but allowed.
+ if (&*MBBI != TBB)
+ report("MBB exits via conditional branch/fall-through but only has "
+ "one CFG successor!", MBB);
+ else if (TBB != *MBB->succ_begin())
+ report("MBB exits via conditional branch/fall-through but the CFG "
+ "successor don't match the actual successor!", MBB);
+ } else if (MBB->succ_size() != 2) {
report("MBB exits via conditional branch/fall-through but doesn't have "
"exactly two CFG successors!", MBB);
} else if (!matchPair(MBB->succ_begin(), TBB, MBBI)) {
if (MBB->empty()) {
report("MBB exits via conditional branch/fall-through but doesn't "
"contain any instructions!", MBB);
- } else if (getBundleStart(&MBB->back())->isBarrier()) {
+ } else if (MBB->back().isBarrier()) {
report("MBB exits via conditional branch/fall-through but ends with a "
"barrier instruction!", MBB);
- } else if (!getBundleStart(&MBB->back())->isTerminator()) {
+ } else if (!MBB->back().isTerminator()) {
report("MBB exits via conditional branch/fall-through but the branch "
"isn't a terminator instruction!", MBB);
}
} else if (TBB && FBB) {
// Block conditionally branches somewhere, otherwise branches
// somewhere else.
- if (MBB->succ_size() != 2) {
+ if (MBB->succ_size() == 1) {
+ // A conditional branch with only one successor is weird, but allowed.
+ if (FBB != TBB)
+ report("MBB exits via conditional branch/branch through but only has "
+ "one CFG successor!", MBB);
+ else if (TBB != *MBB->succ_begin())
+ report("MBB exits via conditional branch/branch through but the CFG "
+ "successor don't match the actual successor!", MBB);
+ } else if (MBB->succ_size() != 2) {
report("MBB exits via conditional branch/branch but doesn't have "
"exactly two CFG successors!", MBB);
} else if (!matchPair(MBB->succ_begin(), TBB, FBB)) {
if (MBB->empty()) {
report("MBB exits via conditional branch/branch but doesn't "
"contain any instructions!", MBB);
- } else if (!getBundleStart(&MBB->back())->isBarrier()) {
+ } else if (!MBB->back().isBarrier()) {
report("MBB exits via conditional branch/branch but doesn't end with a "
"barrier instruction!", MBB);
- } else if (!getBundleStart(&MBB->back())->isTerminator()) {
+ } else if (!MBB->back().isTerminator()) {
report("MBB exits via conditional branch/branch but the branch "
"isn't a terminator instruction!", MBB);
}
report("MBB live-in list contains non-physical register", MBB);
continue;
}
- regsLive.insert(*I);
- for (MCSubRegIterator SubRegs(*I, TRI); SubRegs.isValid(); ++SubRegs)
+ for (MCSubRegIterator SubRegs(*I, TRI, /*IncludeSelf=*/true);
+ SubRegs.isValid(); ++SubRegs)
regsLive.insert(*SubRegs);
}
regsLiveInButUnused = regsLive;
assert(MFI && "Function has no frame info");
BitVector PR = MFI->getPristineRegs(MBB);
for (int I = PR.find_first(); I>0; I = PR.find_next(I)) {
- regsLive.insert(I);
- for (MCSubRegIterator SubRegs(I, TRI); SubRegs.isValid(); ++SubRegs)
+ for (MCSubRegIterator SubRegs(I, TRI, /*IncludeSelf=*/true);
+ SubRegs.isValid(); ++SubRegs)
regsLive.insert(*SubRegs);
}
}
}
+// The operands on an INLINEASM instruction must follow a template.
+// Verify that the flag operands make sense.
+void MachineVerifier::verifyInlineAsm(const MachineInstr *MI) {
+ // The first two operands on INLINEASM are the asm string and global flags.
+ if (MI->getNumOperands() < 2) {
+ report("Too few operands on inline asm", MI);
+ return;
+ }
+ if (!MI->getOperand(0).isSymbol())
+ report("Asm string must be an external symbol", MI);
+ if (!MI->getOperand(1).isImm())
+ report("Asm flags must be an immediate", MI);
+ // Allowed flags are Extra_HasSideEffects = 1, Extra_IsAlignStack = 2,
+ // Extra_AsmDialect = 4, Extra_MayLoad = 8, and Extra_MayStore = 16.
+ if (!isUInt<5>(MI->getOperand(1).getImm()))
+ report("Unknown asm flags", &MI->getOperand(1), 1);
+
+ assert(InlineAsm::MIOp_FirstOperand == 2 && "Asm format changed");
+
+ unsigned OpNo = InlineAsm::MIOp_FirstOperand;
+ unsigned NumOps;
+ for (unsigned e = MI->getNumOperands(); OpNo < e; OpNo += NumOps) {
+ const MachineOperand &MO = MI->getOperand(OpNo);
+ // There may be implicit ops after the fixed operands.
+ if (!MO.isImm())
+ break;
+ NumOps = 1 + InlineAsm::getNumOperandRegisters(MO.getImm());
+ }
+
+ if (OpNo > MI->getNumOperands())
+ report("Missing operands in last group", MI);
+
+ // An optional MDNode follows the groups.
+ if (OpNo < MI->getNumOperands() && MI->getOperand(OpNo).isMetadata())
+ ++OpNo;
+
+ // All trailing operands must be implicit registers.
+ for (unsigned e = MI->getNumOperands(); OpNo < e; ++OpNo) {
+ const MachineOperand &MO = MI->getOperand(OpNo);
+ if (!MO.isReg() || !MO.isImplicit())
+ report("Expected implicit register after groups", &MO, OpNo);
+ }
+}
+
void MachineVerifier::visitMachineInstrBefore(const MachineInstr *MI) {
const MCInstrDesc &MCID = MI->getDesc();
if (MI->getNumOperands() < MCID.getNumOperands()) {
report("Too few operands", MI);
*OS << MCID.getNumOperands() << " operands expected, but "
- << MI->getNumExplicitOperands() << " given.\n";
+ << MI->getNumOperands() << " given.\n";
}
+ // Check the tied operands.
+ if (MI->isInlineAsm())
+ verifyInlineAsm(MI);
+
// Check the MachineMemOperands for basic consistency.
for (MachineInstr::mmo_iterator I = MI->memoperands_begin(),
E = MI->memoperands_end(); I != E; ++I) {
MachineVerifier::visitMachineOperand(const MachineOperand *MO, unsigned MONum) {
const MachineInstr *MI = MO->getParent();
const MCInstrDesc &MCID = MI->getDesc();
- const MCOperandInfo &MCOI = MCID.OpInfo[MONum];
// The first MCID.NumDefs operands must be explicit register defines
if (MONum < MCID.getNumDefs()) {
+ const MCOperandInfo &MCOI = MCID.OpInfo[MONum];
if (!MO->isReg())
report("Explicit definition must be a register", MO, MONum);
else if (!MO->isDef() && !MCOI.isOptionalDef())
else if (MO->isImplicit())
report("Explicit definition marked as implicit", MO, MONum);
} else if (MONum < MCID.getNumOperands()) {
+ const MCOperandInfo &MCOI = MCID.OpInfo[MONum];
// Don't check if it's the last operand in a variadic instruction. See,
// e.g., LDM_RET in the arm back end.
if (MO->isReg() &&
!(MI->isVariadic() && MONum == MCID.getNumOperands()-1)) {
if (MO->isDef() && !MCOI.isOptionalDef())
- report("Explicit operand marked as def", MO, MONum);
+ report("Explicit operand marked as def", MO, MONum);
if (MO->isImplicit())
report("Explicit operand marked as implicit", MO, MONum);
}
+
+ int TiedTo = MCID.getOperandConstraint(MONum, MCOI::TIED_TO);
+ if (TiedTo != -1) {
+ if (!MO->isReg())
+ report("Tied use must be a register", MO, MONum);
+ else if (!MO->isTied())
+ report("Operand should be tied", MO, MONum);
+ else if (unsigned(TiedTo) != MI->findTiedOperandIdx(MONum))
+ report("Tied def doesn't match MCInstrDesc", MO, MONum);
+ } else if (MO->isReg() && MO->isTied())
+ report("Explicit operand should not be tied", MO, MONum);
} else {
// ARM adds %reg0 operands to indicate predicates. We'll allow that.
if (MO->isReg() && !MO->isImplicit() && !MI->isVariadic() && MO->getReg())
if (MRI->tracksLiveness() && !MI->isDebugValue())
checkLiveness(MO, MONum);
+ // Verify the consistency of tied operands.
+ if (MO->isTied()) {
+ unsigned OtherIdx = MI->findTiedOperandIdx(MONum);
+ const MachineOperand &OtherMO = MI->getOperand(OtherIdx);
+ if (!OtherMO.isReg())
+ report("Must be tied to a register", MO, MONum);
+ if (!OtherMO.isTied())
+ report("Missing tie flags on tied operand", MO, MONum);
+ if (MI->findTiedOperandIdx(OtherIdx) != MONum)
+ report("Inconsistent tie links", MO, MONum);
+ if (MONum < MCID.getNumDefs()) {
+ if (OtherIdx < MCID.getNumOperands()) {
+ if (-1 == MCID.getOperandConstraint(OtherIdx, MCOI::TIED_TO))
+ report("Explicit def tied to explicit use without tie constraint",
+ MO, MONum);
+ } else {
+ if (!OtherMO.isImplicit())
+ report("Explicit def should be tied to implicit use", MO, MONum);
+ }
+ }
+ }
+
// Verify two-address constraints after leaving SSA form.
unsigned DefIdx;
if (!MRI->isSSA() && MO->isUse() &&
if (!DRC->contains(Reg)) {
report("Illegal physical register for instruction", MO, MONum);
*OS << TRI->getName(Reg) << " is not a "
- << DRC->getName() << " register.\n";
+ << TRI->getRegClassName(DRC) << " register.\n";
}
}
} else {
TRI->getSubClassWithSubReg(RC, SubIdx);
if (!SRC) {
report("Invalid subregister index for virtual register", MO, MONum);
- *OS << "Register class " << RC->getName()
+ *OS << "Register class " << TRI->getRegClassName(RC)
<< " does not support subreg index " << SubIdx << "\n";
return;
}
if (RC != SRC) {
report("Invalid register class for subregister index", MO, MONum);
- *OS << "Register class " << RC->getName()
+ *OS << "Register class " << TRI->getRegClassName(RC)
<< " does not fully support subreg index " << SubIdx << "\n";
return;
}
}
if (!RC->hasSuperClassEq(DRC)) {
report("Illegal virtual register for instruction", MO, MONum);
- *OS << "Expected a " << DRC->getName() << " register, but got a "
- << RC->getName() << " register\n";
+ *OS << "Expected a " << TRI->getRegClassName(DRC)
+ << " register, but got a " << TRI->getRegClassName(RC)
+ << " register\n";
}
}
}
// Check the cached regunit intervals.
if (TargetRegisterInfo::isPhysicalRegister(Reg) && !isReserved(Reg)) {
for (MCRegUnitIterator Units(Reg, TRI); Units.isValid(); ++Units) {
- if (const LiveInterval *LI = LiveInts->getCachedRegUnit(*Units)) {
- LiveRangeQuery LRQ(*LI, UseIdx);
+ if (const LiveRange *LR = LiveInts->getCachedRegUnit(*Units)) {
+ LiveQueryResult LRQ = LR->Query(UseIdx);
if (!LRQ.valueIn()) {
- report("No live range at use", MO, MONum);
+ report("No live segment at use", MO, MONum);
*OS << UseIdx << " is not live in " << PrintRegUnit(*Units, TRI)
- << ' ' << *LI << '\n';
+ << ' ' << *LR << '\n';
}
if (MO->isKill() && !LRQ.isKill()) {
report("Live range continues after kill flag", MO, MONum);
- *OS << PrintRegUnit(*Units, TRI) << ' ' << *LI << '\n';
+ *OS << PrintRegUnit(*Units, TRI) << ' ' << *LR << '\n';
}
}
}
if (LiveInts->hasInterval(Reg)) {
// This is a virtual register interval.
const LiveInterval &LI = LiveInts->getInterval(Reg);
- LiveRangeQuery LRQ(LI, UseIdx);
+ LiveQueryResult LRQ = LI.Query(UseIdx);
if (!LRQ.valueIn()) {
- report("No live range at use", MO, MONum);
+ report("No live segment at use", MO, MONum);
*OS << UseIdx << " is not live in " << LI << '\n';
}
// Check for extra kill flags.
if (!regsLive.count(Reg)) {
if (TargetRegisterInfo::isPhysicalRegister(Reg)) {
// Reserved registers may be used even when 'dead'.
- if (!isReserved(Reg))
+ bool Bad = !isReserved(Reg);
+ // We are fine if just any subregister has a defined value.
+ if (Bad) {
+ for (MCSubRegIterator SubRegs(Reg, TRI); SubRegs.isValid();
+ ++SubRegs) {
+ if (regsLive.count(*SubRegs)) {
+ Bad = false;
+ break;
+ }
+ }
+ }
+ if (Bad)
report("Using an undefined physical register", MO, MONum);
} else if (MRI->def_empty(Reg)) {
report("Reading virtual register without a def", MO, MONum);
// Verify SSA form.
if (MRI->isSSA() && TargetRegisterInfo::isVirtualRegister(Reg) &&
- llvm::next(MRI->def_begin(Reg)) != MRI->def_end())
+ std::next(MRI->def_begin(Reg)) != MRI->def_end())
report("Multiple virtual register defs in SSA form", MO, MONum);
- // Check LiveInts for a live range, but only for virtual registers.
+ // Check LiveInts for a live segment, but only for virtual registers.
if (LiveInts && TargetRegisterInfo::isVirtualRegister(Reg) &&
!LiveInts->isNotInMIMap(MI)) {
SlotIndex DefIdx = LiveInts->getInstructionIndex(MI);
<< DefIdx << " in " << LI << '\n';
}
} else {
- report("No live range at def", MO, MONum);
+ report("No live segment at def", MO, MONum);
*OS << DefIdx << " is not live in " << LI << '\n';
}
+ // Check that, if the dead def flag is present, LiveInts agree.
+ if (MO->isDead()) {
+ LiveQueryResult LRQ = LI.Query(DefIdx);
+ if (!LRQ.isDeadDef()) {
+ report("Live range continues after dead def flag", MO, MONum);
+ *OS << "Live range: " << LI << '\n';
+ }
+ }
} else {
report("Virtual register has no Live interval", MO, MONum);
}
// First push live-out regs to successors' vregsPassed. Remember the MBBs that
// have any vregsPassed.
SmallPtrSet<const MachineBasicBlock*, 8> todo;
- for (MachineFunction::const_iterator MFI = MF->begin(), MFE = MF->end();
- MFI != MFE; ++MFI) {
- const MachineBasicBlock &MBB(*MFI);
+ for (const auto &MBB : *MF) {
BBInfo &MInfo = MBBInfoMap[&MBB];
if (!MInfo.reachable)
continue;
void MachineVerifier::calcRegsRequired() {
// First push live-in regs to predecessors' vregsRequired.
SmallPtrSet<const MachineBasicBlock*, 8> todo;
- for (MachineFunction::const_iterator MFI = MF->begin(), MFE = MF->end();
- MFI != MFE; ++MFI) {
- const MachineBasicBlock &MBB(*MFI);
+ for (const auto &MBB : *MF) {
BBInfo &MInfo = MBBInfoMap[&MBB];
for (MachineBasicBlock::const_pred_iterator PrI = MBB.pred_begin(),
PrE = MBB.pred_end(); PrI != PrE; ++PrI) {
// calcRegsPassed has been run so BBInfo::isLiveOut is valid.
void MachineVerifier::checkPHIOps(const MachineBasicBlock *MBB) {
SmallPtrSet<const MachineBasicBlock*, 8> seen;
- for (MachineBasicBlock::const_iterator BBI = MBB->begin(), BBE = MBB->end();
- BBI != BBE && BBI->isPHI(); ++BBI) {
+ for (const auto &BBI : *MBB) {
+ if (!BBI.isPHI())
+ break;
seen.clear();
- for (unsigned i = 1, e = BBI->getNumOperands(); i != e; i += 2) {
- unsigned Reg = BBI->getOperand(i).getReg();
- const MachineBasicBlock *Pre = BBI->getOperand(i + 1).getMBB();
+ for (unsigned i = 1, e = BBI.getNumOperands(); i != e; i += 2) {
+ unsigned Reg = BBI.getOperand(i).getReg();
+ const MachineBasicBlock *Pre = BBI.getOperand(i + 1).getMBB();
if (!Pre->isSuccessor(MBB))
continue;
seen.insert(Pre);
BBInfo &PrInfo = MBBInfoMap[Pre];
if (PrInfo.reachable && !PrInfo.isLiveOut(Reg))
report("PHI operand is not live-out from predecessor",
- &BBI->getOperand(i), i);
+ &BBI.getOperand(i), i);
}
// Did we see all predecessors?
for (MachineBasicBlock::const_pred_iterator PrI = MBB->pred_begin(),
PrE = MBB->pred_end(); PrI != PrE; ++PrI) {
if (!seen.count(*PrI)) {
- report("Missing PHI operand", BBI);
+ report("Missing PHI operand", &BBI);
*OS << "BB#" << (*PrI)->getNumber()
<< " is a predecessor according to the CFG.\n";
}
void MachineVerifier::visitMachineFunctionAfter() {
calcRegsPassed();
- for (MachineFunction::const_iterator MFI = MF->begin(), MFE = MF->end();
- MFI != MFE; ++MFI) {
- BBInfo &MInfo = MBBInfoMap[MFI];
+ for (const auto &MBB : *MF) {
+ BBInfo &MInfo = MBBInfoMap[&MBB];
// Skip unreachable MBBs.
if (!MInfo.reachable)
continue;
- checkPHIOps(MFI);
+ checkPHIOps(&MBB);
}
// Now check liveness info if available
calcRegsRequired();
// Check for killed virtual registers that should be live out.
- for (MachineFunction::const_iterator MFI = MF->begin(), MFE = MF->end();
- MFI != MFE; ++MFI) {
- BBInfo &MInfo = MBBInfoMap[MFI];
+ for (const auto &MBB : *MF) {
+ BBInfo &MInfo = MBBInfoMap[&MBB];
for (RegSet::iterator
I = MInfo.vregsRequired.begin(), E = MInfo.vregsRequired.end(); I != E;
++I)
if (MInfo.regsKilled.count(*I)) {
- report("Virtual register killed in block, but needed live out.", MFI);
+ report("Virtual register killed in block, but needed live out.", &MBB);
*OS << "Virtual register " << PrintReg(*I)
<< " is used after the block.\n";
}
for (unsigned i = 0, e = MRI->getNumVirtRegs(); i != e; ++i) {
unsigned Reg = TargetRegisterInfo::index2VirtReg(i);
LiveVariables::VarInfo &VI = LiveVars->getVarInfo(Reg);
- for (MachineFunction::const_iterator MFI = MF->begin(), MFE = MF->end();
- MFI != MFE; ++MFI) {
- BBInfo &MInfo = MBBInfoMap[MFI];
+ for (const auto &MBB : *MF) {
+ BBInfo &MInfo = MBBInfoMap[&MBB];
// Our vregsRequired should be identical to LiveVariables' AliveBlocks
if (MInfo.vregsRequired.count(Reg)) {
- if (!VI.AliveBlocks.test(MFI->getNumber())) {
- report("LiveVariables: Block missing from AliveBlocks", MFI);
+ if (!VI.AliveBlocks.test(MBB.getNumber())) {
+ report("LiveVariables: Block missing from AliveBlocks", &MBB);
*OS << "Virtual register " << PrintReg(Reg)
<< " must be live through the block.\n";
}
} else {
- if (VI.AliveBlocks.test(MFI->getNumber())) {
- report("LiveVariables: Block should not be in AliveBlocks", MFI);
+ if (VI.AliveBlocks.test(MBB.getNumber())) {
+ report("LiveVariables: Block should not be in AliveBlocks", &MBB);
*OS << "Virtual register " << PrintReg(Reg)
<< " is not needed live through the block.\n";
}
const LiveInterval &LI = LiveInts->getInterval(Reg);
assert(Reg == LI.reg && "Invalid reg to interval mapping");
+ verifyLiveInterval(LI);
+ }
- for (LiveInterval::const_vni_iterator I = LI.vni_begin(), E = LI.vni_end();
- I!=E; ++I) {
- VNInfo *VNI = *I;
- const VNInfo *DefVNI = LI.getVNInfoAt(VNI->def);
+ // Verify all the cached regunit intervals.
+ for (unsigned i = 0, e = TRI->getNumRegUnits(); i != e; ++i)
+ if (const LiveRange *LR = LiveInts->getCachedRegUnit(i))
+ verifyLiveRange(*LR, i);
+}
- if (!DefVNI) {
- if (!VNI->isUnused()) {
- report("Valno not live at def and not marked unused", MF);
- *OS << "Valno #" << VNI->id << " in " << LI << '\n';
- }
- continue;
- }
+void MachineVerifier::verifyLiveRangeValue(const LiveRange &LR,
+ const VNInfo *VNI, unsigned Reg,
+ unsigned LaneMask) {
+ if (VNI->isUnused())
+ return;
- if (VNI->isUnused())
- continue;
+ const VNInfo *DefVNI = LR.getVNInfoAt(VNI->def);
- if (DefVNI != VNI) {
- report("Live range at def has different valno", MF);
- *OS << "Valno #" << VNI->id << " is defined at " << VNI->def
- << " where valno #" << DefVNI->id << " is live in " << LI << '\n';
- continue;
- }
+ if (!DefVNI) {
+ report("Valno not live at def and not marked unused", MF, LR, Reg,
+ LaneMask);
+ *OS << "Valno #" << VNI->id << '\n';
+ return;
+ }
- const MachineBasicBlock *MBB = LiveInts->getMBBFromIndex(VNI->def);
- if (!MBB) {
- report("Invalid definition index", MF);
- *OS << "Valno #" << VNI->id << " is defined at " << VNI->def
- << " in " << LI << '\n';
- continue;
- }
+ if (DefVNI != VNI) {
+ report("Live segment at def has different valno", MF, LR, Reg, LaneMask);
+ *OS << "Valno #" << VNI->id << " is defined at " << VNI->def
+ << " where valno #" << DefVNI->id << " is live\n";
+ return;
+ }
- if (VNI->isPHIDef()) {
- if (VNI->def != LiveInts->getMBBStartIdx(MBB)) {
- report("PHIDef value is not defined at MBB start", MF);
- *OS << "Valno #" << VNI->id << " is defined at " << VNI->def
- << ", not at the beginning of BB#" << MBB->getNumber()
- << " in " << LI << '\n';
- }
- } else {
- // Non-PHI def.
- const MachineInstr *MI = LiveInts->getInstructionFromIndex(VNI->def);
- if (!MI) {
- report("No instruction at def index", MF);
- *OS << "Valno #" << VNI->id << " is defined at " << VNI->def
- << " in " << LI << '\n';
- continue;
- }
+ const MachineBasicBlock *MBB = LiveInts->getMBBFromIndex(VNI->def);
+ if (!MBB) {
+ report("Invalid definition index", MF, LR, Reg, LaneMask);
+ *OS << "Valno #" << VNI->id << " is defined at " << VNI->def
+ << " in " << LR << '\n';
+ return;
+ }
- bool hasDef = false;
- bool isEarlyClobber = false;
- for (ConstMIBundleOperands MOI(MI); MOI.isValid(); ++MOI) {
- if (!MOI->isReg() || !MOI->isDef())
- continue;
- if (TargetRegisterInfo::isVirtualRegister(LI.reg)) {
- if (MOI->getReg() != LI.reg)
- continue;
- } else {
- if (!TargetRegisterInfo::isPhysicalRegister(MOI->getReg()) ||
- !TRI->regsOverlap(LI.reg, MOI->getReg()))
- continue;
- }
- hasDef = true;
- if (MOI->isEarlyClobber())
- isEarlyClobber = true;
- }
+ if (VNI->isPHIDef()) {
+ if (VNI->def != LiveInts->getMBBStartIdx(MBB)) {
+ report("PHIDef value is not defined at MBB start", MBB, LR, Reg,
+ LaneMask);
+ *OS << "Valno #" << VNI->id << " is defined at " << VNI->def
+ << ", not at the beginning of BB#" << MBB->getNumber() << '\n';
+ }
+ return;
+ }
- if (!hasDef) {
- report("Defining instruction does not modify register", MI);
- *OS << "Valno #" << VNI->id << " in " << LI << '\n';
- }
+ // Non-PHI def.
+ const MachineInstr *MI = LiveInts->getInstructionFromIndex(VNI->def);
+ if (!MI) {
+ report("No instruction at def index", MBB, LR, Reg, LaneMask);
+ *OS << "Valno #" << VNI->id << " is defined at " << VNI->def << '\n';
+ return;
+ }
- // Early clobber defs begin at USE slots, but other defs must begin at
- // DEF slots.
- if (isEarlyClobber) {
- if (!VNI->def.isEarlyClobber()) {
- report("Early clobber def must be at an early-clobber slot", MF);
- *OS << "Valno #" << VNI->id << " is defined at " << VNI->def
- << " in " << LI << '\n';
- }
- } else if (!VNI->def.isRegister()) {
- report("Non-PHI, non-early clobber def must be at a register slot",
- MF);
- *OS << "Valno #" << VNI->id << " is defined at " << VNI->def
- << " in " << LI << '\n';
- }
+ if (Reg != 0) {
+ bool hasDef = false;
+ bool isEarlyClobber = false;
+ for (ConstMIBundleOperands MOI(MI); MOI.isValid(); ++MOI) {
+ if (!MOI->isReg() || !MOI->isDef())
+ continue;
+ if (TargetRegisterInfo::isVirtualRegister(Reg)) {
+ if (MOI->getReg() != Reg)
+ continue;
+ } else {
+ if (!TargetRegisterInfo::isPhysicalRegister(MOI->getReg()) ||
+ !TRI->hasRegUnit(MOI->getReg(), Reg))
+ continue;
}
+ if (LaneMask != 0 &&
+ (TRI->getSubRegIndexLaneMask(MOI->getSubReg()) & LaneMask) == 0)
+ continue;
+ hasDef = true;
+ if (MOI->isEarlyClobber())
+ isEarlyClobber = true;
}
- for (LiveInterval::const_iterator I = LI.begin(), E = LI.end(); I!=E; ++I) {
- const VNInfo *VNI = I->valno;
- assert(VNI && "Live range has no valno");
+ if (!hasDef) {
+ report("Defining instruction does not modify register", MI);
+ *OS << "Valno #" << VNI->id << " in " << LR << '\n';
+ }
- if (VNI->id >= LI.getNumValNums() || VNI != LI.getValNumInfo(VNI->id)) {
- report("Foreign valno in live range", MF);
- I->print(*OS);
- *OS << " has a valno not in " << LI << '\n';
+ // Early clobber defs begin at USE slots, but other defs must begin at
+ // DEF slots.
+ if (isEarlyClobber) {
+ if (!VNI->def.isEarlyClobber()) {
+ report("Early clobber def must be at an early-clobber slot", MBB, LR,
+ Reg, LaneMask);
+ *OS << "Valno #" << VNI->id << " is defined at " << VNI->def << '\n';
}
+ } else if (!VNI->def.isRegister()) {
+ report("Non-PHI, non-early clobber def must be at a register slot",
+ MBB, LR, Reg, LaneMask);
+ *OS << "Valno #" << VNI->id << " is defined at " << VNI->def << '\n';
+ }
+ }
+}
- if (VNI->isUnused()) {
- report("Live range valno is marked unused", MF);
- I->print(*OS);
- *OS << " in " << LI << '\n';
- }
+void MachineVerifier::verifyLiveRangeSegment(const LiveRange &LR,
+ const LiveRange::const_iterator I,
+ unsigned Reg, unsigned LaneMask) {
+ const LiveRange::Segment &S = *I;
+ const VNInfo *VNI = S.valno;
+ assert(VNI && "Live segment has no valno");
- const MachineBasicBlock *MBB = LiveInts->getMBBFromIndex(I->start);
- if (!MBB) {
- report("Bad start of live segment, no basic block", MF);
- I->print(*OS);
- *OS << " in " << LI << '\n';
- continue;
- }
- SlotIndex MBBStartIdx = LiveInts->getMBBStartIdx(MBB);
- if (I->start != MBBStartIdx && I->start != VNI->def) {
- report("Live segment must begin at MBB entry or valno def", MBB);
- I->print(*OS);
- *OS << " in " << LI << '\n' << "Basic block starts at "
- << MBBStartIdx << '\n';
- }
+ if (VNI->id >= LR.getNumValNums() || VNI != LR.getValNumInfo(VNI->id)) {
+ report("Foreign valno in live segment", MF, LR, Reg, LaneMask);
+ *OS << S << " has a bad valno\n";
+ }
+
+ if (VNI->isUnused()) {
+ report("Live segment valno is marked unused", MF, LR, Reg, LaneMask);
+ *OS << S << '\n';
+ }
+
+ const MachineBasicBlock *MBB = LiveInts->getMBBFromIndex(S.start);
+ if (!MBB) {
+ report("Bad start of live segment, no basic block", MF, LR, Reg, LaneMask);
+ *OS << S << '\n';
+ return;
+ }
+ SlotIndex MBBStartIdx = LiveInts->getMBBStartIdx(MBB);
+ if (S.start != MBBStartIdx && S.start != VNI->def) {
+ report("Live segment must begin at MBB entry or valno def", MBB, LR, Reg,
+ LaneMask);
+ *OS << S << '\n';
+ }
- const MachineBasicBlock *EndMBB =
- LiveInts->getMBBFromIndex(I->end.getPrevSlot());
- if (!EndMBB) {
- report("Bad end of live segment, no basic block", MF);
- I->print(*OS);
- *OS << " in " << LI << '\n';
+ const MachineBasicBlock *EndMBB =
+ LiveInts->getMBBFromIndex(S.end.getPrevSlot());
+ if (!EndMBB) {
+ report("Bad end of live segment, no basic block", MF, LR, Reg, LaneMask);
+ *OS << S << '\n';
+ return;
+ }
+
+ // No more checks for live-out segments.
+ if (S.end == LiveInts->getMBBEndIdx(EndMBB))
+ return;
+
+ // RegUnit intervals are allowed dead phis.
+ if (!TargetRegisterInfo::isVirtualRegister(Reg) && VNI->isPHIDef() &&
+ S.start == VNI->def && S.end == VNI->def.getDeadSlot())
+ return;
+
+ // The live segment is ending inside EndMBB
+ const MachineInstr *MI =
+ LiveInts->getInstructionFromIndex(S.end.getPrevSlot());
+ if (!MI) {
+ report("Live segment doesn't end at a valid instruction", EndMBB, LR, Reg,
+ LaneMask);
+ *OS << S << '\n';
+ return;
+ }
+
+ // The block slot must refer to a basic block boundary.
+ if (S.end.isBlock()) {
+ report("Live segment ends at B slot of an instruction", EndMBB, LR, Reg,
+ LaneMask);
+ *OS << S << '\n';
+ }
+
+ if (S.end.isDead()) {
+ // Segment ends on the dead slot.
+ // That means there must be a dead def.
+ if (!SlotIndex::isSameInstr(S.start, S.end)) {
+ report("Live segment ending at dead slot spans instructions", EndMBB, LR,
+ Reg, LaneMask);
+ *OS << S << '\n';
+ }
+ }
+
+ // A live segment can only end at an early-clobber slot if it is being
+ // redefined by an early-clobber def.
+ if (S.end.isEarlyClobber()) {
+ if (I+1 == LR.end() || (I+1)->start != S.end) {
+ report("Live segment ending at early clobber slot must be "
+ "redefined by an EC def in the same instruction", EndMBB, LR, Reg,
+ LaneMask);
+ *OS << S << '\n';
+ }
+ }
+
+ // The following checks only apply to virtual registers. Physreg liveness
+ // is too weird to check.
+ if (TargetRegisterInfo::isVirtualRegister(Reg)) {
+ // A live segment can end with either a redefinition, a kill flag on a
+ // use, or a dead flag on a def.
+ bool hasRead = false;
+ bool hasSubRegDef = false;
+ for (ConstMIBundleOperands MOI(MI); MOI.isValid(); ++MOI) {
+ if (!MOI->isReg() || MOI->getReg() != Reg)
+ continue;
+ if (LaneMask != 0 &&
+ (LaneMask & TRI->getSubRegIndexLaneMask(MOI->getSubReg())) == 0)
continue;
+ if (MOI->isDef() && MOI->getSubReg() != 0)
+ hasSubRegDef = true;
+ if (MOI->readsReg())
+ hasRead = true;
+ }
+ if (!S.end.isDead()) {
+ if (!hasRead) {
+ // When tracking subregister liveness, the main range must start new
+ // values on partial register writes, even if there is no read.
+ if (!MRI->tracksSubRegLiveness() || LaneMask != 0 || !hasSubRegDef) {
+ report("Instruction ending live segment doesn't read the register",
+ MI);
+ *OS << S << " in " << LR << '\n';
+ }
}
+ }
+ }
- // No more checks for live-out segments.
- if (I->end == LiveInts->getMBBEndIdx(EndMBB))
- continue;
+ // Now check all the basic blocks in this live segment.
+ MachineFunction::const_iterator MFI = MBB;
+ // Is this live segment the beginning of a non-PHIDef VN?
+ if (S.start == VNI->def && !VNI->isPHIDef()) {
+ // Not live-in to any blocks.
+ if (MBB == EndMBB)
+ return;
+ // Skip this block.
+ ++MFI;
+ }
+ for (;;) {
+ assert(LiveInts->isLiveInToMBB(LR, MFI));
+ // We don't know how to track physregs into a landing pad.
+ if (!TargetRegisterInfo::isVirtualRegister(Reg) &&
+ MFI->isLandingPad()) {
+ if (&*MFI == EndMBB)
+ break;
+ ++MFI;
+ continue;
+ }
- // The live segment is ending inside EndMBB
- const MachineInstr *MI =
- LiveInts->getInstructionFromIndex(I->end.getPrevSlot());
- if (!MI) {
- report("Live segment doesn't end at a valid instruction", EndMBB);
- I->print(*OS);
- *OS << " in " << LI << '\n' << "Basic block starts at "
- << MBBStartIdx << '\n';
+ // Is VNI a PHI-def in the current block?
+ bool IsPHI = VNI->isPHIDef() &&
+ VNI->def == LiveInts->getMBBStartIdx(MFI);
+
+ // Check that VNI is live-out of all predecessors.
+ for (MachineBasicBlock::const_pred_iterator PI = MFI->pred_begin(),
+ PE = MFI->pred_end(); PI != PE; ++PI) {
+ SlotIndex PEnd = LiveInts->getMBBEndIdx(*PI);
+ const VNInfo *PVNI = LR.getVNInfoBefore(PEnd);
+
+ // All predecessors must have a live-out value.
+ if (!PVNI) {
+ report("Register not marked live out of predecessor", *PI, LR, Reg,
+ LaneMask);
+ *OS << "Valno #" << VNI->id << " live into BB#" << MFI->getNumber()
+ << '@' << LiveInts->getMBBStartIdx(MFI) << ", not live before "
+ << PEnd << '\n';
continue;
}
- // The block slot must refer to a basic block boundary.
- if (I->end.isBlock()) {
- report("Live segment ends at B slot of an instruction", MI);
- I->print(*OS);
- *OS << " in " << LI << '\n';
+ // Only PHI-defs can take different predecessor values.
+ if (!IsPHI && PVNI != VNI) {
+ report("Different value live out of predecessor", *PI, LR, Reg,
+ LaneMask);
+ *OS << "Valno #" << PVNI->id << " live out of BB#"
+ << (*PI)->getNumber() << '@' << PEnd
+ << "\nValno #" << VNI->id << " live into BB#" << MFI->getNumber()
+ << '@' << LiveInts->getMBBStartIdx(MFI) << '\n';
}
+ }
+ if (&*MFI == EndMBB)
+ break;
+ ++MFI;
+ }
+}
- if (I->end.isDead()) {
- // Segment ends on the dead slot.
- // That means there must be a dead def.
- if (!SlotIndex::isSameInstr(I->start, I->end)) {
- report("Live segment ending at dead slot spans instructions", MI);
- I->print(*OS);
- *OS << " in " << LI << '\n';
- }
- }
+void MachineVerifier::verifyLiveRange(const LiveRange &LR, unsigned Reg,
+ unsigned LaneMask) {
+ for (const VNInfo *VNI : LR.valnos)
+ verifyLiveRangeValue(LR, VNI, Reg, LaneMask);
- // A live segment can only end at an early-clobber slot if it is being
- // redefined by an early-clobber def.
- if (I->end.isEarlyClobber()) {
- if (I+1 == E || (I+1)->start != I->end) {
- report("Live segment ending at early clobber slot must be "
- "redefined by an EC def in the same instruction", MI);
- I->print(*OS);
- *OS << " in " << LI << '\n';
- }
- }
+ for (LiveRange::const_iterator I = LR.begin(), E = LR.end(); I != E; ++I)
+ verifyLiveRangeSegment(LR, I, Reg, LaneMask);
+}
- // The following checks only apply to virtual registers. Physreg liveness
- // is too weird to check.
- if (TargetRegisterInfo::isVirtualRegister(LI.reg)) {
- // A live range can end with either a redefinition, a kill flag on a
- // use, or a dead flag on a def.
- bool hasRead = false;
- bool hasDeadDef = false;
- for (ConstMIBundleOperands MOI(MI); MOI.isValid(); ++MOI) {
- if (!MOI->isReg() || MOI->getReg() != LI.reg)
- continue;
- if (MOI->readsReg())
- hasRead = true;
- if (MOI->isDef() && MOI->isDead())
- hasDeadDef = true;
- }
+void MachineVerifier::verifyLiveInterval(const LiveInterval &LI) {
+ verifyLiveRange(LI, LI.reg);
+
+ unsigned Reg = LI.reg;
+ if (TargetRegisterInfo::isVirtualRegister(Reg)) {
+ unsigned Mask = 0;
+ unsigned MaxMask = MRI->getMaxLaneMaskForVReg(Reg);
+ for (const LiveInterval::SubRange &SR : LI.subranges()) {
+ if ((Mask & SR.LaneMask) != 0)
+ report("Lane masks of sub ranges overlap in live interval", MF, LI);
+ if ((SR.LaneMask & ~MaxMask) != 0)
+ report("Subrange lanemask is invalid", MF, LI);
+ Mask |= SR.LaneMask;
+ verifyLiveRange(SR, LI.reg, SR.LaneMask);
+ if (!LI.covers(SR))
+ report("A Subrange is not covered by the main range", MF, LI);
+ }
+ } else if (LI.hasSubRanges()) {
+ report("subregister liveness only allowed for virtual registers", MF, LI);
+ }
- if (I->end.isDead()) {
- if (!hasDeadDef) {
- report("Instruction doesn't have a dead def operand", MI);
- I->print(*OS);
- *OS << " in " << LI << '\n';
- }
- } else {
- if (!hasRead) {
- report("Instruction ending live range doesn't read the register",
- MI);
- I->print(*OS);
- *OS << " in " << LI << '\n';
- }
- }
+ // Check the LI only has one connected component.
+ if (TargetRegisterInfo::isVirtualRegister(LI.reg)) {
+ ConnectedVNInfoEqClasses ConEQ(*LiveInts);
+ unsigned NumComp = ConEQ.Classify(&LI);
+ if (NumComp > 1) {
+ report("Multiple connected components in live interval", MF, LI);
+ for (unsigned comp = 0; comp != NumComp; ++comp) {
+ *OS << comp << ": valnos";
+ for (LiveInterval::const_vni_iterator I = LI.vni_begin(),
+ E = LI.vni_end(); I!=E; ++I)
+ if (comp == ConEQ.getEqClass(*I))
+ *OS << ' ' << (*I)->id;
+ *OS << '\n';
}
+ }
+ }
+}
- // Now check all the basic blocks in this live segment.
- MachineFunction::const_iterator MFI = MBB;
- // Is this live range the beginning of a non-PHIDef VN?
- if (I->start == VNI->def && !VNI->isPHIDef()) {
- // Not live-in to any blocks.
- if (MBB == EndMBB)
- continue;
- // Skip this block.
- ++MFI;
- }
- for (;;) {
- assert(LiveInts->isLiveInToMBB(LI, MFI));
- // We don't know how to track physregs into a landing pad.
- if (TargetRegisterInfo::isPhysicalRegister(LI.reg) &&
- MFI->isLandingPad()) {
- if (&*MFI == EndMBB)
- break;
- ++MFI;
- continue;
- }
+namespace {
+ // FrameSetup and FrameDestroy can have zero adjustment, so using a single
+ // integer, we can't tell whether it is a FrameSetup or FrameDestroy if the
+ // value is zero.
+ // We use a bool plus an integer to capture the stack state.
+ struct StackStateOfBB {
+ StackStateOfBB() : EntryValue(0), ExitValue(0), EntryIsSetup(false),
+ ExitIsSetup(false) { }
+ StackStateOfBB(int EntryVal, int ExitVal, bool EntrySetup, bool ExitSetup) :
+ EntryValue(EntryVal), ExitValue(ExitVal), EntryIsSetup(EntrySetup),
+ ExitIsSetup(ExitSetup) { }
+ // Can be negative, which means we are setting up a frame.
+ int EntryValue;
+ int ExitValue;
+ bool EntryIsSetup;
+ bool ExitIsSetup;
+ };
+}
- // Is VNI a PHI-def in the current block?
- bool IsPHI = VNI->isPHIDef() &&
- VNI->def == LiveInts->getMBBStartIdx(MFI);
-
- // Check that VNI is live-out of all predecessors.
- for (MachineBasicBlock::const_pred_iterator PI = MFI->pred_begin(),
- PE = MFI->pred_end(); PI != PE; ++PI) {
- SlotIndex PEnd = LiveInts->getMBBEndIdx(*PI);
- const VNInfo *PVNI = LI.getVNInfoBefore(PEnd);
-
- // All predecessors must have a live-out value.
- if (!PVNI) {
- report("Register not marked live out of predecessor", *PI);
- *OS << "Valno #" << VNI->id << " live into BB#" << MFI->getNumber()
- << '@' << LiveInts->getMBBStartIdx(MFI) << ", not live before "
- << PEnd << " in " << LI << '\n';
- continue;
- }
+/// Make sure on every path through the CFG, a FrameSetup <n> is always followed
+/// by a FrameDestroy <n>, stack adjustments are identical on all
+/// CFG edges to a merge point, and frame is destroyed at end of a return block.
+void MachineVerifier::verifyStackFrame() {
+ int FrameSetupOpcode = TII->getCallFrameSetupOpcode();
+ int FrameDestroyOpcode = TII->getCallFrameDestroyOpcode();
+
+ SmallVector<StackStateOfBB, 8> SPState;
+ SPState.resize(MF->getNumBlockIDs());
+ SmallPtrSet<const MachineBasicBlock*, 8> Reachable;
+
+ // Visit the MBBs in DFS order.
+ for (df_ext_iterator<const MachineFunction*,
+ SmallPtrSet<const MachineBasicBlock*, 8> >
+ DFI = df_ext_begin(MF, Reachable), DFE = df_ext_end(MF, Reachable);
+ DFI != DFE; ++DFI) {
+ const MachineBasicBlock *MBB = *DFI;
+
+ StackStateOfBB BBState;
+ // Check the exit state of the DFS stack predecessor.
+ if (DFI.getPathLength() >= 2) {
+ const MachineBasicBlock *StackPred = DFI.getPath(DFI.getPathLength() - 2);
+ assert(Reachable.count(StackPred) &&
+ "DFS stack predecessor is already visited.\n");
+ BBState.EntryValue = SPState[StackPred->getNumber()].ExitValue;
+ BBState.EntryIsSetup = SPState[StackPred->getNumber()].ExitIsSetup;
+ BBState.ExitValue = BBState.EntryValue;
+ BBState.ExitIsSetup = BBState.EntryIsSetup;
+ }
- // Only PHI-defs can take different predecessor values.
- if (!IsPHI && PVNI != VNI) {
- report("Different value live out of predecessor", *PI);
- *OS << "Valno #" << PVNI->id << " live out of BB#"
- << (*PI)->getNumber() << '@' << PEnd
- << "\nValno #" << VNI->id << " live into BB#" << MFI->getNumber()
- << '@' << LiveInts->getMBBStartIdx(MFI) << " in "
- << PrintReg(Reg) << ": " << LI << '\n';
- }
+ // Update stack state by checking contents of MBB.
+ for (const auto &I : *MBB) {
+ if (I.getOpcode() == FrameSetupOpcode) {
+ // The first operand of a FrameOpcode should be i32.
+ int Size = I.getOperand(0).getImm();
+ assert(Size >= 0 &&
+ "Value should be non-negative in FrameSetup and FrameDestroy.\n");
+
+ if (BBState.ExitIsSetup)
+ report("FrameSetup is after another FrameSetup", &I);
+ BBState.ExitValue -= Size;
+ BBState.ExitIsSetup = true;
+ }
+
+ if (I.getOpcode() == FrameDestroyOpcode) {
+ // The first operand of a FrameOpcode should be i32.
+ int Size = I.getOperand(0).getImm();
+ assert(Size >= 0 &&
+ "Value should be non-negative in FrameSetup and FrameDestroy.\n");
+
+ if (!BBState.ExitIsSetup)
+ report("FrameDestroy is not after a FrameSetup", &I);
+ int AbsSPAdj = BBState.ExitValue < 0 ? -BBState.ExitValue :
+ BBState.ExitValue;
+ if (BBState.ExitIsSetup && AbsSPAdj != Size) {
+ report("FrameDestroy <n> is after FrameSetup <m>", &I);
+ *OS << "FrameDestroy <" << Size << "> is after FrameSetup <"
+ << AbsSPAdj << ">.\n";
}
- if (&*MFI == EndMBB)
- break;
- ++MFI;
+ BBState.ExitValue += Size;
+ BBState.ExitIsSetup = false;
+ }
+ }
+ SPState[MBB->getNumber()] = BBState;
+
+ // Make sure the exit state of any predecessor is consistent with the entry
+ // state.
+ for (MachineBasicBlock::const_pred_iterator I = MBB->pred_begin(),
+ E = MBB->pred_end(); I != E; ++I) {
+ if (Reachable.count(*I) &&
+ (SPState[(*I)->getNumber()].ExitValue != BBState.EntryValue ||
+ SPState[(*I)->getNumber()].ExitIsSetup != BBState.EntryIsSetup)) {
+ report("The exit stack state of a predecessor is inconsistent.", MBB);
+ *OS << "Predecessor BB#" << (*I)->getNumber() << " has exit state ("
+ << SPState[(*I)->getNumber()].ExitValue << ", "
+ << SPState[(*I)->getNumber()].ExitIsSetup
+ << "), while BB#" << MBB->getNumber() << " has entry state ("
+ << BBState.EntryValue << ", " << BBState.EntryIsSetup << ").\n";
}
}
- // Check the LI only has one connected component.
- if (TargetRegisterInfo::isVirtualRegister(LI.reg)) {
- ConnectedVNInfoEqClasses ConEQ(*LiveInts);
- unsigned NumComp = ConEQ.Classify(&LI);
- if (NumComp > 1) {
- report("Multiple connected components in live interval", MF);
- *OS << NumComp << " components in " << LI << '\n';
- for (unsigned comp = 0; comp != NumComp; ++comp) {
- *OS << comp << ": valnos";
- for (LiveInterval::const_vni_iterator I = LI.vni_begin(),
- E = LI.vni_end(); I!=E; ++I)
- if (comp == ConEQ.getEqClass(*I))
- *OS << ' ' << (*I)->id;
- *OS << '\n';
- }
+ // Make sure the entry state of any successor is consistent with the exit
+ // state.
+ for (MachineBasicBlock::const_succ_iterator I = MBB->succ_begin(),
+ E = MBB->succ_end(); I != E; ++I) {
+ if (Reachable.count(*I) &&
+ (SPState[(*I)->getNumber()].EntryValue != BBState.ExitValue ||
+ SPState[(*I)->getNumber()].EntryIsSetup != BBState.ExitIsSetup)) {
+ report("The entry stack state of a successor is inconsistent.", MBB);
+ *OS << "Successor BB#" << (*I)->getNumber() << " has entry state ("
+ << SPState[(*I)->getNumber()].EntryValue << ", "
+ << SPState[(*I)->getNumber()].EntryIsSetup
+ << "), while BB#" << MBB->getNumber() << " has exit state ("
+ << BBState.ExitValue << ", " << BBState.ExitIsSetup << ").\n";
}
}
+
+ // Make sure a basic block with return ends with zero stack adjustment.
+ if (!MBB->empty() && MBB->back().isReturn()) {
+ if (BBState.ExitIsSetup)
+ report("A return block ends with a FrameSetup.", MBB);
+ if (BBState.ExitValue)
+ report("A return block ends with a nonzero stack adjustment.", MBB);
+ }
}
}
projects / oota-llvm.git / blobdiff