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 /// coalesceLocation - After LocNo was changed, check if it has become
192 /// identical to another location, and coalesce them. This may cause LocNo or
193 /// a later location to be erased, but no earlier location will be erased.
194 void coalesceLocation(unsigned LocNo);
196 /// insertDebugValue - Insert a DBG_VALUE into MBB at Idx for LocNo.
197 void insertDebugValue(MachineBasicBlock *MBB, SlotIndex Idx, unsigned LocNo,
198 LiveIntervals &LIS, const TargetInstrInfo &TII);
200 /// insertDebugKill - Insert an undef DBG_VALUE into MBB at Idx.
201 void insertDebugKill(MachineBasicBlock *MBB, SlotIndex Idx,
202 LiveIntervals &LIS, const TargetInstrInfo &TII);
205 /// UserValue - Create a new UserValue.
206 UserValue(const MDNode *var, unsigned o, LocMap::Allocator &alloc)
207 : variable(var), offset(o), leader(this), next(0), locInts(alloc)
210 /// getLeader - Get the leader of this value's equivalence class.
211 UserValue *getLeader() {
212 UserValue *l = leader;
213 while (l != l->leader)
218 /// getNext - Return the next UserValue in the equivalence class.
219 UserValue *getNext() const { return next; }
221 /// match - Does this UserValue match the aprameters?
222 bool match(const MDNode *Var, unsigned Offset) const {
223 return Var == variable && Offset == offset;
226 /// merge - Merge equivalence classes.
227 static UserValue *merge(UserValue *L1, UserValue *L2) {
228 L2 = L2->getLeader();
231 L1 = L1->getLeader();
234 // Splice L2 before L1's members.
237 End->leader = L1, End = End->next;
239 End->next = L1->next;
244 /// getLocationNo - Return the location number that matches Loc.
245 unsigned getLocationNo(Location Loc) {
248 unsigned n = std::find(locations.begin(), locations.end(), Loc) -
250 if (n == locations.size())
251 locations.push_back(Loc);
255 /// addDef - Add a definition point to this value.
256 void addDef(SlotIndex Idx, const MachineOperand &LocMO) {
257 // Add a singular (Idx,Idx) -> Loc mapping.
258 LocMap::iterator I = locInts.find(Idx);
259 if (!I.valid() || I.start() != Idx)
260 I.insert(Idx, Idx.getNextSlot(), getLocationNo(LocMO));
263 /// extendDef - Extend the current definition as far as possible down the
264 /// dominator tree. Stop when meeting an existing def or when leaving the live
266 /// @param Idx Starting point for the definition.
267 /// @param LocNo Location number to propagate.
268 /// @param LI Restrict liveness to where LI has the value VNI. May be null.
269 /// @param VNI When LI is not null, this is the value to restrict to.
270 /// @param LIS Live intervals analysis.
271 /// @param MDT Dominator tree.
272 void extendDef(SlotIndex Idx, unsigned LocNo,
273 LiveInterval *LI, const VNInfo *VNI,
274 LiveIntervals &LIS, MachineDominatorTree &MDT);
276 /// computeIntervals - Compute the live intervals of all locations after
277 /// collecting all their def points.
278 void computeIntervals(LiveIntervals &LIS, MachineDominatorTree &MDT);
280 /// renameRegister - Update locations to rewrite OldReg as NewReg:SubIdx.
281 void renameRegister(unsigned OldReg, unsigned NewReg, unsigned SubIdx,
282 const TargetRegisterInfo *TRI);
284 /// rewriteLocations - Rewrite virtual register locations according to the
285 /// provided virtual register map.
286 void rewriteLocations(VirtRegMap &VRM, const TargetRegisterInfo &TRI);
288 /// emitDebugVariables - Recreate DBG_VALUE instruction from data structures.
289 void emitDebugValues(VirtRegMap *VRM,
290 LiveIntervals &LIS, const TargetInstrInfo &TRI);
292 void print(raw_ostream&, const TargetRegisterInfo*);
296 /// LDVImpl - Implementation of the LiveDebugVariables pass.
299 LiveDebugVariables &pass;
300 LocMap::Allocator allocator;
303 MachineDominatorTree *MDT;
304 const TargetRegisterInfo *TRI;
306 /// userValues - All allocated UserValue instances.
307 SmallVector<UserValue*, 8> userValues;
309 /// Map virtual register to eq class leader.
310 typedef DenseMap<unsigned, UserValue*> VRMap;
311 VRMap virtRegToEqClass;
313 /// Map user variable to eq class leader.
314 typedef DenseMap<const MDNode *, UserValue*> UVMap;
317 /// getUserValue - Find or create a UserValue.
318 UserValue *getUserValue(const MDNode *Var, unsigned Offset);
320 /// lookupVirtReg - Find the EC leader for VirtReg or null.
321 UserValue *lookupVirtReg(unsigned VirtReg);
323 /// mapVirtReg - Map virtual register to an equivalence class.
324 void mapVirtReg(unsigned VirtReg, UserValue *EC);
326 /// handleDebugValue - Add DBG_VALUE instruction to our maps.
327 /// @param MI DBG_VALUE instruction
328 /// @param Idx Last valid SLotIndex before instruction.
329 /// @return True if the DBG_VALUE instruction should be deleted.
330 bool handleDebugValue(MachineInstr *MI, SlotIndex Idx);
332 /// collectDebugValues - Collect and erase all DBG_VALUE instructions, adding
333 /// a UserValue def for each instruction.
334 /// @param mf MachineFunction to be scanned.
335 /// @return True if any debug values were found.
336 bool collectDebugValues(MachineFunction &mf);
338 /// computeIntervals - Compute the live intervals of all user values after
339 /// collecting all their def points.
340 void computeIntervals();
343 LDVImpl(LiveDebugVariables *ps) : pass(*ps) {}
344 bool runOnMachineFunction(MachineFunction &mf);
346 /// clear - Relase all memory.
348 DeleteContainerPointers(userValues);
350 virtRegToEqClass.clear();
354 /// renameRegister - Replace all references to OldReg wiht NewReg:SubIdx.
355 void renameRegister(unsigned OldReg, unsigned NewReg, unsigned SubIdx);
357 /// emitDebugVariables - Recreate DBG_VALUE instruction from data structures.
358 void emitDebugValues(VirtRegMap *VRM);
360 void print(raw_ostream&);
364 void Location::print(raw_ostream &OS, const TargetRegisterInfo *TRI) {
370 OS << "int:" << Data.ImmVal;
373 OS << "fp:" << Data.CFP->getValueAPF().convertToDouble();
377 if (TargetRegisterInfo::isVirtualRegister(Kind)) {
378 OS << "%reg" << Kind;
380 OS << ':' << TRI->getSubRegIndexName(Data.SubIdx);
382 OS << '%' << TRI->getName(Kind);
384 OS << "fi#" << ~Kind;
386 OS << '+' << Data.Offset;
392 void UserValue::print(raw_ostream &OS, const TargetRegisterInfo *TRI) {
393 if (const MDString *MDS = dyn_cast<MDString>(variable->getOperand(2)))
394 OS << "!\"" << MDS->getString() << "\"\t";
397 for (LocMap::const_iterator I = locInts.begin(); I.valid(); ++I) {
398 OS << " [" << I.start() << ';' << I.stop() << "):";
399 if (I.value() == ~0u)
404 for (unsigned i = 0, e = locations.size(); i != e; ++i) {
405 OS << " Loc" << i << '=';
406 locations[i].print(OS, TRI);
411 void LDVImpl::print(raw_ostream &OS) {
412 OS << "********** DEBUG VARIABLES **********\n";
413 for (unsigned i = 0, e = userValues.size(); i != e; ++i)
414 userValues[i]->print(OS, TRI);
417 void UserValue::coalesceLocation(unsigned LocNo) {
418 unsigned KeepLoc = std::find(locations.begin(), locations.begin() + LocNo,
419 locations[LocNo]) - locations.begin();
420 unsigned EraseLoc = LocNo;
421 if (KeepLoc == LocNo) {
422 EraseLoc = std::find(locations.begin() + LocNo + 1, locations.end(),
423 locations[LocNo]) - locations.begin();
425 if (EraseLoc == locations.size())
428 assert(KeepLoc < EraseLoc);
429 locations.erase(locations.begin() + EraseLoc);
432 for (LocMap::iterator I = locInts.begin(); I.valid(); ++I) {
433 unsigned v = I.value();
435 I.setValue(KeepLoc); // Coalesce when possible.
436 else if (v > EraseLoc)
437 I.setValueUnchecked(v-1); // Avoid coalescing with untransformed values.
441 UserValue *LDVImpl::getUserValue(const MDNode *Var, unsigned Offset) {
442 UserValue *&Leader = userVarMap[Var];
444 UserValue *UV = Leader->getLeader();
446 for (; UV; UV = UV->getNext())
447 if (UV->match(Var, Offset))
451 UserValue *UV = new UserValue(Var, Offset, allocator);
452 userValues.push_back(UV);
453 Leader = UserValue::merge(Leader, UV);
457 void LDVImpl::mapVirtReg(unsigned VirtReg, UserValue *EC) {
458 assert(TargetRegisterInfo::isVirtualRegister(VirtReg) && "Only map VirtRegs");
459 UserValue *&Leader = virtRegToEqClass[VirtReg];
460 Leader = UserValue::merge(Leader, EC);
463 UserValue *LDVImpl::lookupVirtReg(unsigned VirtReg) {
464 if (UserValue *UV = virtRegToEqClass.lookup(VirtReg))
465 return UV->getLeader();
469 bool LDVImpl::handleDebugValue(MachineInstr *MI, SlotIndex Idx) {
470 // DBG_VALUE loc, offset, variable
471 if (MI->getNumOperands() != 3 ||
472 !MI->getOperand(1).isImm() || !MI->getOperand(2).isMetadata()) {
473 DEBUG(dbgs() << "Can't handle " << *MI);
477 // Get or create the UserValue for (variable,offset).
478 unsigned Offset = MI->getOperand(1).getImm();
479 const MDNode *Var = MI->getOperand(2).getMetadata();
480 UserValue *UV = getUserValue(Var, Offset);
482 // If the location is a virtual register, make sure it is mapped.
483 if (MI->getOperand(0).isReg()) {
484 unsigned Reg = MI->getOperand(0).getReg();
485 if (Reg && TargetRegisterInfo::isVirtualRegister(Reg))
489 UV->addDef(Idx, MI->getOperand(0));
493 bool LDVImpl::collectDebugValues(MachineFunction &mf) {
494 bool Changed = false;
495 for (MachineFunction::iterator MFI = mf.begin(), MFE = mf.end(); MFI != MFE;
497 MachineBasicBlock *MBB = MFI;
498 for (MachineBasicBlock::iterator MBBI = MBB->begin(), MBBE = MBB->end();
500 if (!MBBI->isDebugValue()) {
504 // DBG_VALUE has no slot index, use the previous instruction instead.
505 SlotIndex Idx = MBBI == MBB->begin() ?
506 LIS->getMBBStartIdx(MBB) :
507 LIS->getInstructionIndex(llvm::prior(MBBI)).getDefIndex();
508 // Handle consecutive DBG_VALUE instructions with the same slot index.
510 if (handleDebugValue(MBBI, Idx)) {
511 MBBI = MBB->erase(MBBI);
515 } while (MBBI != MBBE && MBBI->isDebugValue());
521 void UserValue::extendDef(SlotIndex Idx, unsigned LocNo,
522 LiveInterval *LI, const VNInfo *VNI,
523 LiveIntervals &LIS, MachineDominatorTree &MDT) {
524 SmallVector<SlotIndex, 16> Todo;
528 SlotIndex Start = Todo.pop_back_val();
529 MachineBasicBlock *MBB = LIS.getMBBFromIndex(Start);
530 SlotIndex Stop = LIS.getMBBEndIdx(MBB);
531 LocMap::iterator I = locInts.find(Idx);
533 // Limit to VNI's live range.
536 LiveRange *Range = LI->getLiveRangeContaining(Start);
537 if (!Range || Range->valno != VNI)
539 if (Range->end < Stop)
540 Stop = Range->end, ToEnd = false;
543 // There could already be a short def at Start.
544 if (I.valid() && I.start() <= Start) {
545 // Stop when meeting a different location or an already extended interval.
546 Start = Start.getNextSlot();
547 if (I.value() != LocNo || I.stop() != Start)
549 // This is a one-slot placeholder. Just skip it.
553 // Limited by the next def.
554 if (I.valid() && I.start() < Stop)
555 Stop = I.start(), ToEnd = false;
560 I.insert(Start, Stop, LocNo);
562 // If we extended to the MBB end, propagate down the dominator tree.
565 const std::vector<MachineDomTreeNode*> &Children =
566 MDT.getNode(MBB)->getChildren();
567 for (unsigned i = 0, e = Children.size(); i != e; ++i)
568 Todo.push_back(LIS.getMBBStartIdx(Children[i]->getBlock()));
569 } while (!Todo.empty());
573 UserValue::computeIntervals(LiveIntervals &LIS, MachineDominatorTree &MDT) {
574 SmallVector<std::pair<SlotIndex, unsigned>, 16> Defs;
576 // Collect all defs to be extended (Skipping undefs).
577 for (LocMap::const_iterator I = locInts.begin(); I.valid(); ++I)
578 if (I.value() != ~0u)
579 Defs.push_back(std::make_pair(I.start(), I.value()));
581 for (unsigned i = 0, e = Defs.size(); i != e; ++i) {
582 SlotIndex Idx = Defs[i].first;
583 unsigned LocNo = Defs[i].second;
584 const Location &Loc = locations[LocNo];
586 // Register locations are constrained to where the register value is live.
587 if (Loc.isReg() && LIS.hasInterval(Loc.Kind)) {
588 LiveInterval *LI = &LIS.getInterval(Loc.Kind);
589 const VNInfo *VNI = LI->getVNInfoAt(Idx);
590 extendDef(Idx, LocNo, LI, VNI, LIS, MDT);
592 extendDef(Idx, LocNo, 0, 0, LIS, MDT);
595 // Finally, erase all the undefs.
596 for (LocMap::iterator I = locInts.begin(); I.valid();)
597 if (I.value() == ~0u)
603 void LDVImpl::computeIntervals() {
604 for (unsigned i = 0, e = userValues.size(); i != e; ++i)
605 userValues[i]->computeIntervals(*LIS, *MDT);
608 bool LDVImpl::runOnMachineFunction(MachineFunction &mf) {
610 LIS = &pass.getAnalysis<LiveIntervals>();
611 MDT = &pass.getAnalysis<MachineDominatorTree>();
612 TRI = mf.getTarget().getRegisterInfo();
614 DEBUG(dbgs() << "********** COMPUTING LIVE DEBUG VARIABLES: "
615 << ((Value*)mf.getFunction())->getName()
618 bool Changed = collectDebugValues(mf);
620 DEBUG(print(dbgs()));
624 bool LiveDebugVariables::runOnMachineFunction(MachineFunction &mf) {
628 pImpl = new LDVImpl(this);
629 return static_cast<LDVImpl*>(pImpl)->runOnMachineFunction(mf);
632 void LiveDebugVariables::releaseMemory() {
634 static_cast<LDVImpl*>(pImpl)->clear();
637 LiveDebugVariables::~LiveDebugVariables() {
639 delete static_cast<LDVImpl*>(pImpl);
643 renameRegister(unsigned OldReg, unsigned NewReg, unsigned SubIdx,
644 const TargetRegisterInfo *TRI) {
645 for (unsigned i = locations.size(); i; --i) {
646 unsigned LocNo = i - 1;
647 Location &Loc = locations[LocNo];
648 if (Loc.Kind != OldReg)
651 if (SubIdx && Loc.Data.SubIdx)
652 Loc.Data.SubIdx = TRI->composeSubRegIndices(SubIdx, Loc.Data.SubIdx);
653 coalesceLocation(LocNo);
658 renameRegister(unsigned OldReg, unsigned NewReg, unsigned SubIdx) {
659 UserValue *UV = lookupVirtReg(OldReg);
663 if (TargetRegisterInfo::isVirtualRegister(NewReg))
664 mapVirtReg(NewReg, UV);
665 virtRegToEqClass.erase(OldReg);
668 UV->renameRegister(OldReg, NewReg, SubIdx, TRI);
673 void LiveDebugVariables::
674 renameRegister(unsigned OldReg, unsigned NewReg, unsigned SubIdx) {
676 static_cast<LDVImpl*>(pImpl)->renameRegister(OldReg, NewReg, SubIdx);
680 UserValue::rewriteLocations(VirtRegMap &VRM, const TargetRegisterInfo &TRI) {
681 // Iterate over locations in reverse makes it easier to handle coalescing.
682 for (unsigned i = locations.size(); i ; --i) {
683 unsigned LocNo = i-1;
684 Location &Loc = locations[LocNo];
685 // Only virtual registers are rewritten.
686 if (!Loc.isReg() || !TargetRegisterInfo::isVirtualRegister(Loc.Kind))
688 unsigned VirtReg = Loc.Kind;
689 if (VRM.isAssignedReg(VirtReg)) {
690 unsigned PhysReg = VRM.getPhys(VirtReg);
692 PhysReg = TRI.getSubReg(PhysReg, Loc.Data.SubIdx);
695 } else if (VRM.getStackSlot(VirtReg) != VirtRegMap::NO_STACK_SLOT) {
696 Loc.Kind = ~VRM.getStackSlot(VirtReg);
697 // FIXME: Translate SubIdx to a stackslot offset.
700 Loc.Kind = Location::locUndef;
702 coalesceLocation(LocNo);
704 DEBUG(print(dbgs(), &TRI));
707 /// findInsertLocation - Find an iterator and DebugLoc for inserting a DBG_VALUE
709 static MachineBasicBlock::iterator
710 findInsertLocation(MachineBasicBlock *MBB, SlotIndex Idx, DebugLoc &DL,
711 LiveIntervals &LIS) {
712 SlotIndex Start = LIS.getMBBStartIdx(MBB);
713 Idx = Idx.getBaseIndex();
715 // Try to find an insert location by going backwards from Idx.
717 while (!(MI = LIS.getInstructionFromIndex(Idx))) {
718 // We've reached the beginning of MBB.
720 MachineBasicBlock::iterator I = MBB->SkipPHIsAndLabels(MBB->begin());
722 DL = I->getDebugLoc();
725 Idx = Idx.getPrevIndex();
727 // We found an instruction. The insert point is after the instr.
728 DL = MI->getDebugLoc();
729 return llvm::next(MachineBasicBlock::iterator(MI));
732 void UserValue::insertDebugValue(MachineBasicBlock *MBB, SlotIndex Idx,
735 const TargetInstrInfo &TII) {
737 MachineBasicBlock::iterator I = findInsertLocation(MBB, Idx, DL, LIS);
738 Location &Loc = locations[LocNo];
740 // Frame index locations may require a target callback.
741 if (Loc.isFrameIndex()) {
742 MachineInstr *MI = TII.emitFrameIndexDebugValue(*MBB->getParent(),
744 offset, variable, DL);
750 // This is not a frame index, or the target is happy with a standard FI.
751 Loc.addOperand(BuildMI(*MBB, I, DL, TII.get(TargetOpcode::DBG_VALUE)))
752 .addImm(offset).addMetadata(variable);
755 void UserValue::insertDebugKill(MachineBasicBlock *MBB, SlotIndex Idx,
756 LiveIntervals &LIS, const TargetInstrInfo &TII) {
758 MachineBasicBlock::iterator I = findInsertLocation(MBB, Idx, DL, LIS);
759 BuildMI(*MBB, I, DL, TII.get(TargetOpcode::DBG_VALUE)).addReg(0)
760 .addImm(offset).addMetadata(variable);
763 void UserValue::emitDebugValues(VirtRegMap *VRM, LiveIntervals &LIS,
764 const TargetInstrInfo &TII) {
765 MachineFunction::iterator MFEnd = VRM->getMachineFunction().end();
767 for (LocMap::const_iterator I = locInts.begin(); I.valid();) {
768 SlotIndex Start = I.start();
769 SlotIndex Stop = I.stop();
770 unsigned LocNo = I.value();
771 DEBUG(dbgs() << "\t[" << Start << ';' << Stop << "):" << LocNo);
772 MachineFunction::iterator MBB = LIS.getMBBFromIndex(Start);
773 SlotIndex MBBEnd = LIS.getMBBEndIdx(MBB);
775 DEBUG(dbgs() << " BB#" << MBB->getNumber() << '-' << MBBEnd);
776 insertDebugValue(MBB, Start, LocNo, LIS, TII);
778 // This interval may span multiple basic blocks.
779 // Insert a DBG_VALUE into each one.
780 while(Stop > MBBEnd) {
781 // Move to the next block.
785 MBBEnd = LIS.getMBBEndIdx(MBB);
786 DEBUG(dbgs() << " BB#" << MBB->getNumber() << '-' << MBBEnd);
787 insertDebugValue(MBB, Start, LocNo, LIS, TII);
789 DEBUG(dbgs() << '\n');
796 // The current interval ends before MBB.
797 // Insert a kill if there is a gap.
798 if (!I.valid() || I.start() > Stop)
799 insertDebugKill(MBB, Stop, LIS, TII);
803 void LDVImpl::emitDebugValues(VirtRegMap *VRM) {
804 DEBUG(dbgs() << "********** EMITTING LIVE DEBUG VARIABLES **********\n");
805 const TargetInstrInfo *TII = MF->getTarget().getInstrInfo();
806 for (unsigned i = 0, e = userValues.size(); i != e; ++i) {
807 userValues[i]->rewriteLocations(*VRM, *TRI);
808 userValues[i]->emitDebugValues(VRM, *LIS, *TII);
812 void LiveDebugVariables::emitDebugValues(VirtRegMap *VRM) {
814 static_cast<LDVImpl*>(pImpl)->emitDebugValues(VRM);
819 void LiveDebugVariables::dump() {
821 static_cast<LDVImpl*>(pImpl)->print(dbgs());