1 //===- LiveDebugVariables.cpp - Tracking debug info variables -------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements the LiveDebugVariables analysis.
12 // Remove all DBG_VALUE instructions referencing virtual registers and replace
13 // them with a data structure tracking where live user variables are kept - in a
14 // virtual register or in a stack slot.
16 // Allow the data structure to be updated during register allocation when values
17 // are moved between registers and stack slots. Finally emit new DBG_VALUE
18 // instructions after register allocation is complete.
20 //===----------------------------------------------------------------------===//
22 #define DEBUG_TYPE "livedebug"
23 #include "LiveDebugVariables.h"
24 #include "VirtRegMap.h"
25 #include "llvm/Constants.h"
26 #include "llvm/Metadata.h"
27 #include "llvm/Value.h"
28 #include "llvm/ADT/IntervalMap.h"
29 #include "llvm/CodeGen/LiveIntervalAnalysis.h"
30 #include "llvm/CodeGen/MachineDominators.h"
31 #include "llvm/CodeGen/MachineFunction.h"
32 #include "llvm/CodeGen/MachineInstrBuilder.h"
33 #include "llvm/CodeGen/Passes.h"
34 #include "llvm/Support/CommandLine.h"
35 #include "llvm/Support/Debug.h"
36 #include "llvm/Target/TargetInstrInfo.h"
37 #include "llvm/Target/TargetMachine.h"
38 #include "llvm/Target/TargetRegisterInfo.h"
43 EnableLDV("live-debug-variables",
44 cl::desc("Enable the live debug variables pass"), cl::Hidden);
46 char LiveDebugVariables::ID = 0;
48 INITIALIZE_PASS_BEGIN(LiveDebugVariables, "livedebugvars",
49 "Debug Variable Analysis", false, false)
50 INITIALIZE_PASS_DEPENDENCY(MachineDominatorTree)
51 INITIALIZE_PASS_DEPENDENCY(LiveIntervals)
52 INITIALIZE_PASS_END(LiveDebugVariables, "livedebugvars",
53 "Debug Variable Analysis", false, false)
55 void LiveDebugVariables::getAnalysisUsage(AnalysisUsage &AU) const {
56 AU.addRequired<MachineDominatorTree>();
57 AU.addRequiredTransitive<LiveIntervals>();
59 MachineFunctionPass::getAnalysisUsage(AU);
62 LiveDebugVariables::LiveDebugVariables() : MachineFunctionPass(ID), pImpl(0) {
63 initializeLiveDebugVariablesPass(*PassRegistry::getPassRegistry());
66 /// Location - All the different places a user value can reside.
67 /// Note that this includes immediate values that technically aren't locations.
70 /// kind - What kind of location is this?
76 /// Kind - One of the following:
78 /// 2. Register number (physical or virtual), data.SubIdx is the subreg index.
79 /// 3. ~Frame index, data.Offset is the offset.
80 /// 4. locImm, data.ImmVal is the constant integer value.
81 /// 5. locFPImm, data.CFP points to the floating point constant.
84 /// Data - Extra data about location.
86 unsigned SubIdx; ///< For virtual registers.
87 int64_t Offset; ///< For frame indices.
88 int64_t ImmVal; ///< For locImm.
89 const ConstantFP *CFP; ///< For locFPImm.
92 Location(const MachineOperand &MO) {
93 switch(MO.getType()) {
94 case MachineOperand::MO_Register:
96 Data.SubIdx = MO.getSubReg();
98 case MachineOperand::MO_Immediate:
100 Data.ImmVal = MO.getImm();
102 case MachineOperand::MO_FPImmediate:
104 Data.CFP = MO.getFPImm();
106 case MachineOperand::MO_FrameIndex:
107 Kind = ~MO.getIndex();
108 // FIXME: MO_FrameIndex should support an offset.
117 /// addOperand - Add this location as a machine operand to MI.
118 MachineInstrBuilder addOperand(MachineInstrBuilder MI) const {
121 return MI.addImm(Data.ImmVal);
123 return MI.addFPImm(Data.CFP);
126 return MI.addFrameIndex(getFrameIndex());
128 return MI.addReg(Kind); // reg and undef.
132 bool operator==(const Location &RHS) const {
133 if (Kind != RHS.Kind)
139 return Data.ImmVal == RHS.Data.ImmVal;
141 return Data.CFP == RHS.Data.CFP;
144 return Data.SubIdx == RHS.Data.SubIdx;
146 return Data.Offset == RHS.Data.Offset;
150 /// isUndef - is this the singleton undef?
151 bool isUndef() const { return Kind == locUndef; }
153 /// isReg - is this a register location?
154 bool isReg() const { return Kind && Kind < locImm; }
156 /// isFrameIndex - is this a frame index location?
157 bool isFrameIndex() const { return Kind > locFPImm; }
159 int getFrameIndex() const { return ~Kind; }
161 void print(raw_ostream&, const TargetRegisterInfo*);
165 /// LocMap - Map of where a user value is live, and its location.
166 typedef IntervalMap<SlotIndex, unsigned, 4> LocMap;
168 /// UserValue - A user value is a part of a debug info user variable.
170 /// A DBG_VALUE instruction notes that (a sub-register of) a virtual register
171 /// holds part of a user variable. The part is identified by a byte offset.
173 /// UserValues are grouped into equivalence classes for easier searching. Two
174 /// user values are related if they refer to the same variable, or if they are
175 /// held by the same virtual register. The equivalence class is the transitive
176 /// closure of that relation.
179 const MDNode *variable; ///< The debug info variable we are part of.
180 unsigned offset; ///< Byte offset into variable.
182 UserValue *leader; ///< Equivalence class leader.
183 UserValue *next; ///< Next value in equivalence class, or null.
185 /// Numbered locations referenced by locmap.
186 SmallVector<Location, 4> locations;
188 /// Map of slot indices where this value is live.
191 /// insertDebugValue - Insert a DBG_VALUE into MBB at Idx for LocNo.
192 void insertDebugValue(MachineBasicBlock *MBB, SlotIndex Idx, unsigned LocNo,
193 LiveIntervals &LIS, const TargetInstrInfo &TII);
195 /// insertDebugKill - Insert an undef DBG_VALUE into MBB at Idx.
196 void insertDebugKill(MachineBasicBlock *MBB, SlotIndex Idx,
197 LiveIntervals &LIS, const TargetInstrInfo &TII);
200 /// UserValue - Create a new UserValue.
201 UserValue(const MDNode *var, unsigned o, LocMap::Allocator &alloc)
202 : variable(var), offset(o), leader(this), next(0), locInts(alloc)
205 /// getLeader - Get the leader of this value's equivalence class.
206 UserValue *getLeader() {
207 UserValue *l = leader;
208 while (l != l->leader)
213 /// getNext - Return the next UserValue in the equivalence class.
214 UserValue *getNext() const { return next; }
216 /// match - Does this UserValue match the aprameters?
217 bool match(const MDNode *Var, unsigned Offset) const {
218 return Var == variable && Offset == offset;
221 /// merge - Merge equivalence classes.
222 static UserValue *merge(UserValue *L1, UserValue *L2) {
223 L2 = L2->getLeader();
226 L1 = L1->getLeader();
229 // Splice L2 before L1's members.
232 End->leader = L1, End = End->next;
234 End->next = L1->next;
239 /// getLocationNo - Return the location number that matches Loc.
240 unsigned getLocationNo(Location Loc) {
243 unsigned n = std::find(locations.begin(), locations.end(), Loc) -
245 if (n == locations.size())
246 locations.push_back(Loc);
250 /// addDef - Add a definition point to this value.
251 void addDef(SlotIndex Idx, const MachineOperand &LocMO) {
252 // Add a singular (Idx,Idx) -> Loc mapping.
253 LocMap::iterator I = locInts.find(Idx);
254 if (!I.valid() || I.start() != Idx)
255 I.insert(Idx, Idx.getNextSlot(), getLocationNo(LocMO));
258 /// extendDef - Extend the current definition as far as possible down the
259 /// dominator tree. Stop when meeting an existing def or when leaving the live
261 /// @param Idx Starting point for the definition.
262 /// @param LocNo Location number to propagate.
263 /// @param LI Restrict liveness to where LI has the value VNI. May be null.
264 /// @param VNI When LI is not null, this is the value to restrict to.
265 /// @param LIS Live intervals analysis.
266 /// @param MDT Dominator tree.
267 void extendDef(SlotIndex Idx, unsigned LocNo,
268 LiveInterval *LI, const VNInfo *VNI,
269 LiveIntervals &LIS, MachineDominatorTree &MDT);
271 /// computeIntervals - Compute the live intervals of all locations after
272 /// collecting all their def points.
273 void computeIntervals(LiveIntervals &LIS, MachineDominatorTree &MDT);
275 /// renameRegister - Update locations to rewrite OldReg as NewReg:SubIdx.
276 void renameRegister(unsigned OldReg, unsigned NewReg, unsigned SubIdx,
277 const TargetRegisterInfo *TRI);
279 /// rewriteLocations - Rewrite virtual register locations according to the
280 /// provided virtual register map.
281 void rewriteLocations(VirtRegMap &VRM, const TargetRegisterInfo &TRI);
283 /// emitDebugVariables - Recreate DBG_VALUE instruction from data structures.
284 void emitDebugValues(VirtRegMap *VRM,
285 LiveIntervals &LIS, const TargetInstrInfo &TRI);
287 void print(raw_ostream&, const TargetRegisterInfo*);
291 /// LDVImpl - Implementation of the LiveDebugVariables pass.
294 LiveDebugVariables &pass;
295 LocMap::Allocator allocator;
298 MachineDominatorTree *MDT;
299 const TargetRegisterInfo *TRI;
301 /// userValues - All allocated UserValue instances.
302 SmallVector<UserValue*, 8> userValues;
304 /// Map virtual register to eq class leader.
305 typedef DenseMap<unsigned, UserValue*> VRMap;
308 /// Map user variable to eq class leader.
309 typedef DenseMap<const MDNode *, UserValue*> UVMap;
312 /// getUserValue - Find or create a UserValue.
313 UserValue *getUserValue(const MDNode *Var, unsigned Offset);
315 /// lookupVirtReg - Find the EC leader for VirtReg or null.
316 UserValue *lookupVirtReg(unsigned VirtReg);
318 /// mapVirtReg - Map virtual register to an equivalence class.
319 void mapVirtReg(unsigned VirtReg, UserValue *EC);
321 /// handleDebugValue - Add DBG_VALUE instruction to our maps.
322 /// @param MI DBG_VALUE instruction
323 /// @param Idx Last valid SLotIndex before instruction.
324 /// @return True if the DBG_VALUE instruction should be deleted.
325 bool handleDebugValue(MachineInstr *MI, SlotIndex Idx);
327 /// collectDebugValues - Collect and erase all DBG_VALUE instructions, adding
328 /// a UserValue def for each instruction.
329 /// @param mf MachineFunction to be scanned.
330 /// @return True if any debug values were found.
331 bool collectDebugValues(MachineFunction &mf);
333 /// computeIntervals - Compute the live intervals of all user values after
334 /// collecting all their def points.
335 void computeIntervals();
338 LDVImpl(LiveDebugVariables *ps) : pass(*ps) {}
339 bool runOnMachineFunction(MachineFunction &mf);
341 /// clear - Relase all memory.
343 DeleteContainerPointers(userValues);
349 /// renameRegister - Replace all references to OldReg wiht NewReg:SubIdx.
350 void renameRegister(unsigned OldReg, unsigned NewReg, unsigned SubIdx);
352 /// emitDebugVariables - Recreate DBG_VALUE instruction from data structures.
353 void emitDebugValues(VirtRegMap *VRM);
355 void print(raw_ostream&);
359 void Location::print(raw_ostream &OS, const TargetRegisterInfo *TRI) {
365 OS << "int:" << Data.ImmVal;
368 OS << "fp:" << Data.CFP->getValueAPF().convertToDouble();
372 if (TargetRegisterInfo::isVirtualRegister(Kind)) {
373 OS << "%reg" << Kind;
375 OS << ':' << TRI->getSubRegIndexName(Data.SubIdx);
377 OS << '%' << TRI->getName(Kind);
379 OS << "fi#" << ~Kind;
381 OS << '+' << Data.Offset;
387 void UserValue::print(raw_ostream &OS, const TargetRegisterInfo *TRI) {
388 if (const MDString *MDS = dyn_cast<MDString>(variable->getOperand(2)))
389 OS << "!\"" << MDS->getString() << "\"\t";
392 for (LocMap::const_iterator I = locInts.begin(); I.valid(); ++I) {
393 OS << " [" << I.start() << ';' << I.stop() << "):";
394 if (I.value() == ~0u)
399 for (unsigned i = 0, e = locations.size(); i != e; ++i) {
400 OS << " Loc" << i << '=';
401 locations[i].print(OS, TRI);
406 void LDVImpl::print(raw_ostream &OS) {
407 OS << "********** DEBUG VARIABLES **********\n";
408 for (unsigned i = 0, e = userValues.size(); i != e; ++i)
409 userValues[i]->print(OS, TRI);
412 UserValue *LDVImpl::getUserValue(const MDNode *Var, unsigned Offset) {
413 UserValue *&Leader = userVarMap[Var];
415 UserValue *UV = Leader->getLeader();
417 for (; UV; UV = UV->getNext())
418 if (UV->match(Var, Offset))
422 UserValue *UV = new UserValue(Var, Offset, allocator);
423 userValues.push_back(UV);
424 Leader = UserValue::merge(Leader, UV);
428 void LDVImpl::mapVirtReg(unsigned VirtReg, UserValue *EC) {
429 assert(TargetRegisterInfo::isVirtualRegister(VirtReg) && "Only map VirtRegs");
430 UserValue *&Leader = virtRegMap[VirtReg];
431 Leader = UserValue::merge(Leader, EC);
434 UserValue *LDVImpl::lookupVirtReg(unsigned VirtReg) {
435 if (UserValue *UV = virtRegMap.lookup(VirtReg))
436 return UV->getLeader();
440 bool LDVImpl::handleDebugValue(MachineInstr *MI, SlotIndex Idx) {
441 // DBG_VALUE loc, offset, variable
442 if (MI->getNumOperands() != 3 ||
443 !MI->getOperand(1).isImm() || !MI->getOperand(2).isMetadata()) {
444 DEBUG(dbgs() << "Can't handle " << *MI);
448 // Get or create the UserValue for (variable,offset).
449 unsigned Offset = MI->getOperand(1).getImm();
450 const MDNode *Var = MI->getOperand(2).getMetadata();
451 UserValue *UV = getUserValue(Var, Offset);
453 // If the location is a virtual register, make sure it is mapped.
454 if (MI->getOperand(0).isReg()) {
455 unsigned Reg = MI->getOperand(0).getReg();
456 if (Reg && TargetRegisterInfo::isVirtualRegister(Reg))
460 UV->addDef(Idx, MI->getOperand(0));
464 bool LDVImpl::collectDebugValues(MachineFunction &mf) {
465 bool Changed = false;
466 for (MachineFunction::iterator MFI = mf.begin(), MFE = mf.end(); MFI != MFE;
468 MachineBasicBlock *MBB = MFI;
469 for (MachineBasicBlock::iterator MBBI = MBB->begin(), MBBE = MBB->end();
471 if (!MBBI->isDebugValue()) {
475 // DBG_VALUE has no slot index, use the previous instruction instead.
476 SlotIndex Idx = MBBI == MBB->begin() ?
477 LIS->getMBBStartIdx(MBB) :
478 LIS->getInstructionIndex(llvm::prior(MBBI)).getDefIndex();
479 // Handle consecutive DBG_VALUE instructions with the same slot index.
481 if (handleDebugValue(MBBI, Idx)) {
482 MBBI = MBB->erase(MBBI);
486 } while (MBBI != MBBE && MBBI->isDebugValue());
492 void UserValue::extendDef(SlotIndex Idx, unsigned LocNo,
493 LiveInterval *LI, const VNInfo *VNI,
494 LiveIntervals &LIS, MachineDominatorTree &MDT) {
495 SmallVector<SlotIndex, 16> Todo;
499 SlotIndex Start = Todo.pop_back_val();
500 MachineBasicBlock *MBB = LIS.getMBBFromIndex(Start);
501 SlotIndex Stop = LIS.getMBBEndIdx(MBB);
502 LocMap::iterator I = locInts.find(Idx);
504 // Limit to VNI's live range.
507 LiveRange *Range = LI->getLiveRangeContaining(Start);
508 if (!Range || Range->valno != VNI)
510 if (Range->end < Stop)
511 Stop = Range->end, ToEnd = false;
514 // There could already be a short def at Start.
515 if (I.valid() && I.start() <= Start) {
516 // Stop when meeting a different location or an already extended interval.
517 Start = Start.getNextSlot();
518 if (I.value() != LocNo || I.stop() != Start)
520 // This is a one-slot placeholder. Just skip it.
524 // Limited by the next def.
525 if (I.valid() && I.start() < Stop)
526 Stop = I.start(), ToEnd = false;
531 I.insert(Start, Stop, LocNo);
533 // If we extended to the MBB end, propagate down the dominator tree.
536 const std::vector<MachineDomTreeNode*> &Children =
537 MDT.getNode(MBB)->getChildren();
538 for (unsigned i = 0, e = Children.size(); i != e; ++i)
539 Todo.push_back(LIS.getMBBStartIdx(Children[i]->getBlock()));
540 } while (!Todo.empty());
544 UserValue::computeIntervals(LiveIntervals &LIS, MachineDominatorTree &MDT) {
545 SmallVector<std::pair<SlotIndex, unsigned>, 16> Defs;
547 // Collect all defs to be extended (Skipping undefs).
548 for (LocMap::const_iterator I = locInts.begin(); I.valid(); ++I)
549 if (I.value() != ~0u)
550 Defs.push_back(std::make_pair(I.start(), I.value()));
552 for (unsigned i = 0, e = Defs.size(); i != e; ++i) {
553 SlotIndex Idx = Defs[i].first;
554 unsigned LocNo = Defs[i].second;
555 const Location &Loc = locations[LocNo];
557 // Register locations are constrained to where the register value is live.
558 if (Loc.isReg() && LIS.hasInterval(Loc.Kind)) {
559 LiveInterval *LI = &LIS.getInterval(Loc.Kind);
560 const VNInfo *VNI = LI->getVNInfoAt(Idx);
561 extendDef(Idx, LocNo, LI, VNI, LIS, MDT);
563 extendDef(Idx, LocNo, 0, 0, LIS, MDT);
566 // Finally, erase all the undefs.
567 for (LocMap::iterator I = locInts.begin(); I.valid();)
568 if (I.value() == ~0u)
574 void LDVImpl::computeIntervals() {
575 for (unsigned i = 0, e = userValues.size(); i != e; ++i)
576 userValues[i]->computeIntervals(*LIS, *MDT);
579 bool LDVImpl::runOnMachineFunction(MachineFunction &mf) {
581 LIS = &pass.getAnalysis<LiveIntervals>();
582 MDT = &pass.getAnalysis<MachineDominatorTree>();
583 TRI = mf.getTarget().getRegisterInfo();
585 DEBUG(dbgs() << "********** COMPUTING LIVE DEBUG VARIABLES: "
586 << ((Value*)mf.getFunction())->getName()
589 bool Changed = collectDebugValues(mf);
591 DEBUG(print(dbgs()));
595 bool LiveDebugVariables::runOnMachineFunction(MachineFunction &mf) {
599 pImpl = new LDVImpl(this);
600 return static_cast<LDVImpl*>(pImpl)->runOnMachineFunction(mf);
603 void LiveDebugVariables::releaseMemory() {
605 static_cast<LDVImpl*>(pImpl)->clear();
608 LiveDebugVariables::~LiveDebugVariables() {
610 delete static_cast<LDVImpl*>(pImpl);
614 renameRegister(unsigned OldReg, unsigned NewReg, unsigned SubIdx,
615 const TargetRegisterInfo *TRI) {
616 for (unsigned i = 0, e = locations.size(); i != e; ++i) {
617 Location &Loc = locations[i];
618 if (Loc.Kind != OldReg)
621 if (SubIdx && Loc.Data.SubIdx)
622 Loc.Data.SubIdx = TRI->composeSubRegIndices(SubIdx, Loc.Data.SubIdx);
627 renameRegister(unsigned OldReg, unsigned NewReg, unsigned SubIdx) {
628 UserValue *UV = lookupVirtReg(OldReg);
632 if (TargetRegisterInfo::isVirtualRegister(NewReg))
633 mapVirtReg(NewReg, UV);
634 virtRegMap.erase(OldReg);
637 UV->renameRegister(OldReg, NewReg, SubIdx, TRI);
642 void LiveDebugVariables::
643 renameRegister(unsigned OldReg, unsigned NewReg, unsigned SubIdx) {
645 static_cast<LDVImpl*>(pImpl)->renameRegister(OldReg, NewReg, SubIdx);
649 UserValue::rewriteLocations(VirtRegMap &VRM, const TargetRegisterInfo &TRI) {
650 // Iterate over locations in reverse makes it easier to handle coalescing.
651 for (unsigned i = locations.size(); i ; --i) {
652 unsigned LocNo = i-1;
653 Location &Loc = locations[LocNo];
654 // Only virtual registers are rewritten.
655 if (!Loc.isReg() || !TargetRegisterInfo::isVirtualRegister(Loc.Kind))
657 unsigned VirtReg = Loc.Kind;
658 if (VRM.isAssignedReg(VirtReg)) {
659 unsigned PhysReg = VRM.getPhys(VirtReg);
661 PhysReg = TRI.getSubReg(PhysReg, Loc.Data.SubIdx);
664 } else if (VRM.getStackSlot(VirtReg) != VirtRegMap::NO_STACK_SLOT) {
665 Loc.Kind = ~VRM.getStackSlot(VirtReg);
666 // FIXME: Translate SubIdx to a stackslot offset.
669 Loc.Kind = Location::locUndef;
672 DEBUG(print(dbgs(), &TRI));
675 /// findInsertLocation - Find an iterator and DebugLoc for inserting a DBG_VALUE
677 static MachineBasicBlock::iterator
678 findInsertLocation(MachineBasicBlock *MBB, SlotIndex Idx, DebugLoc &DL,
679 LiveIntervals &LIS) {
680 SlotIndex Start = LIS.getMBBStartIdx(MBB);
681 Idx = Idx.getBaseIndex();
683 // Try to find an insert location by going backwards from Idx.
685 while (!(MI = LIS.getInstructionFromIndex(Idx))) {
686 // We've reached the beginning of MBB.
688 MachineBasicBlock::iterator I = MBB->SkipPHIsAndLabels(MBB->begin());
690 DL = I->getDebugLoc();
693 Idx = Idx.getPrevIndex();
695 // We found an instruction. The insert point is after the instr.
696 DL = MI->getDebugLoc();
697 return llvm::next(MachineBasicBlock::iterator(MI));
700 void UserValue::insertDebugValue(MachineBasicBlock *MBB, SlotIndex Idx,
703 const TargetInstrInfo &TII) {
705 MachineBasicBlock::iterator I = findInsertLocation(MBB, Idx, DL, LIS);
706 Location &Loc = locations[LocNo];
708 // Frame index locations may require a target callback.
709 if (Loc.isFrameIndex()) {
710 MachineInstr *MI = TII.emitFrameIndexDebugValue(*MBB->getParent(),
712 offset, variable, DL);
718 // This is not a frame index, or the target is happy with a standard FI.
719 Loc.addOperand(BuildMI(*MBB, I, DL, TII.get(TargetOpcode::DBG_VALUE)))
720 .addImm(offset).addMetadata(variable);
723 void UserValue::insertDebugKill(MachineBasicBlock *MBB, SlotIndex Idx,
724 LiveIntervals &LIS, const TargetInstrInfo &TII) {
726 MachineBasicBlock::iterator I = findInsertLocation(MBB, Idx, DL, LIS);
727 BuildMI(*MBB, I, DL, TII.get(TargetOpcode::DBG_VALUE)).addReg(0)
728 .addImm(offset).addMetadata(variable);
731 void UserValue::emitDebugValues(VirtRegMap *VRM, LiveIntervals &LIS,
732 const TargetInstrInfo &TII) {
733 MachineFunction::iterator MFEnd = VRM->getMachineFunction().end();
735 for (LocMap::const_iterator I = locInts.begin(); I.valid();) {
736 SlotIndex Start = I.start();
737 SlotIndex Stop = I.stop();
738 unsigned LocNo = I.value();
739 DEBUG(dbgs() << "\t[" << Start << ';' << Stop << "):" << LocNo);
740 MachineFunction::iterator MBB = LIS.getMBBFromIndex(Start);
741 SlotIndex MBBEnd = LIS.getMBBEndIdx(MBB);
743 DEBUG(dbgs() << " BB#" << MBB->getNumber() << '-' << MBBEnd);
744 insertDebugValue(MBB, Start, LocNo, LIS, TII);
746 // This interval may span multiple basic blocks.
747 // Insert a DBG_VALUE into each one.
748 while(Stop > MBBEnd) {
749 // Move to the next block.
753 MBBEnd = LIS.getMBBEndIdx(MBB);
754 DEBUG(dbgs() << " BB#" << MBB->getNumber() << '-' << MBBEnd);
755 insertDebugValue(MBB, Start, LocNo, LIS, TII);
757 DEBUG(dbgs() << '\n');
764 // The current interval ends before MBB.
765 // Insert a kill if there is a gap.
766 if (!I.valid() || I.start() > Stop)
767 insertDebugKill(MBB, Stop, LIS, TII);
771 void LDVImpl::emitDebugValues(VirtRegMap *VRM) {
772 DEBUG(dbgs() << "********** EMITTING LIVE DEBUG VARIABLES **********\n");
773 const TargetInstrInfo *TII = MF->getTarget().getInstrInfo();
774 for (unsigned i = 0, e = userValues.size(); i != e; ++i) {
775 userValues[i]->rewriteLocations(*VRM, *TRI);
776 userValues[i]->emitDebugValues(VRM, *LIS, *TII);
780 void LiveDebugVariables::emitDebugValues(VirtRegMap *VRM) {
782 static_cast<LDVImpl*>(pImpl)->emitDebugValues(VRM);
787 void LiveDebugVariables::dump() {
789 static_cast<LDVImpl*>(pImpl)->print(dbgs());