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Diffstat (limited to 'lib/CodeGen/LiveDebugVariables.cpp')
| -rw-r--r-- | lib/CodeGen/LiveDebugVariables.cpp | 711 |
1 files changed, 711 insertions, 0 deletions
diff --git a/lib/CodeGen/LiveDebugVariables.cpp b/lib/CodeGen/LiveDebugVariables.cpp new file mode 100644 index 0000000000000..853ec1ac7c13a --- /dev/null +++ b/lib/CodeGen/LiveDebugVariables.cpp @@ -0,0 +1,711 @@ +//===- LiveDebugVariables.cpp - Tracking debug info variables -------------===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// +// +// This file implements the LiveDebugVariables analysis. +// +// Remove all DBG_VALUE instructions referencing virtual registers and replace +// them with a data structure tracking where live user variables are kept - in a +// virtual register or in a stack slot. +// +// Allow the data structure to be updated during register allocation when values +// are moved between registers and stack slots. Finally emit new DBG_VALUE +// instructions after register allocation is complete. +// +//===----------------------------------------------------------------------===// + +#define DEBUG_TYPE "livedebug" +#include "LiveDebugVariables.h" +#include "VirtRegMap.h" +#include "llvm/Constants.h" +#include "llvm/Metadata.h" +#include "llvm/Value.h" +#include "llvm/ADT/IntervalMap.h" +#include "llvm/CodeGen/LiveIntervalAnalysis.h" +#include "llvm/CodeGen/MachineDominators.h" +#include "llvm/CodeGen/MachineFunction.h" +#include "llvm/CodeGen/MachineInstrBuilder.h" +#include "llvm/CodeGen/Passes.h" +#include "llvm/Support/CommandLine.h" +#include "llvm/Support/Debug.h" +#include "llvm/Target/TargetInstrInfo.h" +#include "llvm/Target/TargetMachine.h" +#include "llvm/Target/TargetRegisterInfo.h" + +using namespace llvm; + +static cl::opt<bool> +EnableLDV("live-debug-variables", cl::init(true), + cl::desc("Enable the live debug variables pass"), cl::Hidden); + +char LiveDebugVariables::ID = 0; + +INITIALIZE_PASS_BEGIN(LiveDebugVariables, "livedebugvars", + "Debug Variable Analysis", false, false) +INITIALIZE_PASS_DEPENDENCY(MachineDominatorTree) +INITIALIZE_PASS_DEPENDENCY(LiveIntervals) +INITIALIZE_PASS_END(LiveDebugVariables, "livedebugvars", + "Debug Variable Analysis", false, false) + +void LiveDebugVariables::getAnalysisUsage(AnalysisUsage &AU) const { + AU.addRequired<MachineDominatorTree>(); + AU.addRequiredTransitive<LiveIntervals>(); + AU.setPreservesAll(); + MachineFunctionPass::getAnalysisUsage(AU); +} + +LiveDebugVariables::LiveDebugVariables() : MachineFunctionPass(ID), pImpl(0) { + initializeLiveDebugVariablesPass(*PassRegistry::getPassRegistry()); +} + +/// LocMap - Map of where a user value is live, and its location. +typedef IntervalMap<SlotIndex, unsigned, 4> LocMap; + +/// UserValue - A user value is a part of a debug info user variable. +/// +/// A DBG_VALUE instruction notes that (a sub-register of) a virtual register +/// holds part of a user variable. The part is identified by a byte offset. +/// +/// UserValues are grouped into equivalence classes for easier searching. Two +/// user values are related if they refer to the same variable, or if they are +/// held by the same virtual register. The equivalence class is the transitive +/// closure of that relation. +namespace { +class UserValue { + const MDNode *variable; ///< The debug info variable we are part of. + unsigned offset; ///< Byte offset into variable. + DebugLoc dl; ///< The debug location for the variable. This is + ///< used by dwarf writer to find lexical scope. + UserValue *leader; ///< Equivalence class leader. + UserValue *next; ///< Next value in equivalence class, or null. + + /// Numbered locations referenced by locmap. + SmallVector<MachineOperand, 4> locations; + + /// Map of slot indices where this value is live. + LocMap locInts; + + /// coalesceLocation - After LocNo was changed, check if it has become + /// identical to another location, and coalesce them. This may cause LocNo or + /// a later location to be erased, but no earlier location will be erased. + void coalesceLocation(unsigned LocNo); + + /// insertDebugValue - Insert a DBG_VALUE into MBB at Idx for LocNo. + void insertDebugValue(MachineBasicBlock *MBB, SlotIndex Idx, unsigned LocNo, + LiveIntervals &LIS, const TargetInstrInfo &TII); + + /// insertDebugKill - Insert an undef DBG_VALUE into MBB at Idx. + void insertDebugKill(MachineBasicBlock *MBB, SlotIndex Idx, + LiveIntervals &LIS, const TargetInstrInfo &TII); + +public: + /// UserValue - Create a new UserValue. + UserValue(const MDNode *var, unsigned o, DebugLoc L, + LocMap::Allocator &alloc) + : variable(var), offset(o), dl(L), leader(this), next(0), locInts(alloc) + {} + + /// getLeader - Get the leader of this value's equivalence class. + UserValue *getLeader() { + UserValue *l = leader; + while (l != l->leader) + l = l->leader; + return leader = l; + } + + /// getNext - Return the next UserValue in the equivalence class. + UserValue *getNext() const { return next; } + + /// match - Does this UserValue match the aprameters? + bool match(const MDNode *Var, unsigned Offset) const { + return Var == variable && Offset == offset; + } + + /// merge - Merge equivalence classes. + static UserValue *merge(UserValue *L1, UserValue *L2) { + L2 = L2->getLeader(); + if (!L1) + return L2; + L1 = L1->getLeader(); + if (L1 == L2) + return L1; + // Splice L2 before L1's members. + UserValue *End = L2; + while (End->next) + End->leader = L1, End = End->next; + End->leader = L1; + End->next = L1->next; + L1->next = L2; + return L1; + } + + /// getLocationNo - Return the location number that matches Loc. + unsigned getLocationNo(const MachineOperand &LocMO) { + if (LocMO.isReg() && LocMO.getReg() == 0) + return ~0u; + for (unsigned i = 0, e = locations.size(); i != e; ++i) + if (LocMO.isIdenticalTo(locations[i])) + return i; + locations.push_back(LocMO); + // We are storing a MachineOperand outside a MachineInstr. + locations.back().clearParent(); + return locations.size() - 1; + } + + /// addDef - Add a definition point to this value. + void addDef(SlotIndex Idx, const MachineOperand &LocMO) { + // Add a singular (Idx,Idx) -> Loc mapping. + LocMap::iterator I = locInts.find(Idx); + if (!I.valid() || I.start() != Idx) + I.insert(Idx, Idx.getNextSlot(), getLocationNo(LocMO)); + } + + /// extendDef - Extend the current definition as far as possible down the + /// dominator tree. Stop when meeting an existing def or when leaving the live + /// range of VNI. + /// @param Idx Starting point for the definition. + /// @param LocNo Location number to propagate. + /// @param LI Restrict liveness to where LI has the value VNI. May be null. + /// @param VNI When LI is not null, this is the value to restrict to. + /// @param LIS Live intervals analysis. + /// @param MDT Dominator tree. + void extendDef(SlotIndex Idx, unsigned LocNo, + LiveInterval *LI, const VNInfo *VNI, + LiveIntervals &LIS, MachineDominatorTree &MDT); + + /// computeIntervals - Compute the live intervals of all locations after + /// collecting all their def points. + void computeIntervals(LiveIntervals &LIS, MachineDominatorTree &MDT); + + /// renameRegister - Update locations to rewrite OldReg as NewReg:SubIdx. + void renameRegister(unsigned OldReg, unsigned NewReg, unsigned SubIdx, + const TargetRegisterInfo *TRI); + + /// rewriteLocations - Rewrite virtual register locations according to the + /// provided virtual register map. + void rewriteLocations(VirtRegMap &VRM, const TargetRegisterInfo &TRI); + + /// emitDebugVariables - Recreate DBG_VALUE instruction from data structures. + void emitDebugValues(VirtRegMap *VRM, + LiveIntervals &LIS, const TargetInstrInfo &TRI); + + /// findDebugLoc - Return DebugLoc used for this DBG_VALUE instruction. A + /// variable may have more than one corresponding DBG_VALUE instructions. + /// Only first one needs DebugLoc to identify variable's lexical scope + /// in source file. + DebugLoc findDebugLoc(); + void print(raw_ostream&, const TargetRegisterInfo*); +}; +} // namespace + +/// LDVImpl - Implementation of the LiveDebugVariables pass. +namespace { +class LDVImpl { + LiveDebugVariables &pass; + LocMap::Allocator allocator; + MachineFunction *MF; + LiveIntervals *LIS; + MachineDominatorTree *MDT; + const TargetRegisterInfo *TRI; + + /// userValues - All allocated UserValue instances. + SmallVector<UserValue*, 8> userValues; + + /// Map virtual register to eq class leader. + typedef DenseMap<unsigned, UserValue*> VRMap; + VRMap virtRegToEqClass; + + /// Map user variable to eq class leader. + typedef DenseMap<const MDNode *, UserValue*> UVMap; + UVMap userVarMap; + + /// getUserValue - Find or create a UserValue. + UserValue *getUserValue(const MDNode *Var, unsigned Offset, DebugLoc DL); + + /// lookupVirtReg - Find the EC leader for VirtReg or null. + UserValue *lookupVirtReg(unsigned VirtReg); + + /// mapVirtReg - Map virtual register to an equivalence class. + void mapVirtReg(unsigned VirtReg, UserValue *EC); + + /// handleDebugValue - Add DBG_VALUE instruction to our maps. + /// @param MI DBG_VALUE instruction + /// @param Idx Last valid SLotIndex before instruction. + /// @return True if the DBG_VALUE instruction should be deleted. + bool handleDebugValue(MachineInstr *MI, SlotIndex Idx); + + /// collectDebugValues - Collect and erase all DBG_VALUE instructions, adding + /// a UserValue def for each instruction. + /// @param mf MachineFunction to be scanned. + /// @return True if any debug values were found. + bool collectDebugValues(MachineFunction &mf); + + /// computeIntervals - Compute the live intervals of all user values after + /// collecting all their def points. + void computeIntervals(); + +public: + LDVImpl(LiveDebugVariables *ps) : pass(*ps) {} + bool runOnMachineFunction(MachineFunction &mf); + + /// clear - Relase all memory. + void clear() { + DeleteContainerPointers(userValues); + userValues.clear(); + virtRegToEqClass.clear(); + userVarMap.clear(); + } + + /// renameRegister - Replace all references to OldReg wiht NewReg:SubIdx. + void renameRegister(unsigned OldReg, unsigned NewReg, unsigned SubIdx); + + /// emitDebugVariables - Recreate DBG_VALUE instruction from data structures. + void emitDebugValues(VirtRegMap *VRM); + + void print(raw_ostream&); +}; +} // namespace + +void UserValue::print(raw_ostream &OS, const TargetRegisterInfo *TRI) { + if (const MDString *MDS = dyn_cast<MDString>(variable->getOperand(2))) + OS << "!\"" << MDS->getString() << "\"\t"; + if (offset) + OS << '+' << offset; + for (LocMap::const_iterator I = locInts.begin(); I.valid(); ++I) { + OS << " [" << I.start() << ';' << I.stop() << "):"; + if (I.value() == ~0u) + OS << "undef"; + else + OS << I.value(); + } + for (unsigned i = 0, e = locations.size(); i != e; ++i) + OS << " Loc" << i << '=' << locations[i]; + OS << '\n'; +} + +void LDVImpl::print(raw_ostream &OS) { + OS << "********** DEBUG VARIABLES **********\n"; + for (unsigned i = 0, e = userValues.size(); i != e; ++i) + userValues[i]->print(OS, TRI); +} + +void UserValue::coalesceLocation(unsigned LocNo) { + unsigned KeepLoc = 0; + for (unsigned e = locations.size(); KeepLoc != e; ++KeepLoc) { + if (KeepLoc == LocNo) + continue; + if (locations[KeepLoc].isIdenticalTo(locations[LocNo])) + break; + } + // No matches. + if (KeepLoc == locations.size()) + return; + + // Keep the smaller location, erase the larger one. + unsigned EraseLoc = LocNo; + if (KeepLoc > EraseLoc) + std::swap(KeepLoc, EraseLoc); + locations.erase(locations.begin() + EraseLoc); + + // Rewrite values. + for (LocMap::iterator I = locInts.begin(); I.valid(); ++I) { + unsigned v = I.value(); + if (v == EraseLoc) + I.setValue(KeepLoc); // Coalesce when possible. + else if (v > EraseLoc) + I.setValueUnchecked(v-1); // Avoid coalescing with untransformed values. + } +} + +UserValue *LDVImpl::getUserValue(const MDNode *Var, unsigned Offset, + DebugLoc DL) { + UserValue *&Leader = userVarMap[Var]; + if (Leader) { + UserValue *UV = Leader->getLeader(); + Leader = UV; + for (; UV; UV = UV->getNext()) + if (UV->match(Var, Offset)) + return UV; + } + + UserValue *UV = new UserValue(Var, Offset, DL, allocator); + userValues.push_back(UV); + Leader = UserValue::merge(Leader, UV); + return UV; +} + +void LDVImpl::mapVirtReg(unsigned VirtReg, UserValue *EC) { + assert(TargetRegisterInfo::isVirtualRegister(VirtReg) && "Only map VirtRegs"); + UserValue *&Leader = virtRegToEqClass[VirtReg]; + Leader = UserValue::merge(Leader, EC); +} + +UserValue *LDVImpl::lookupVirtReg(unsigned VirtReg) { + if (UserValue *UV = virtRegToEqClass.lookup(VirtReg)) + return UV->getLeader(); + return 0; +} + +bool LDVImpl::handleDebugValue(MachineInstr *MI, SlotIndex Idx) { + // DBG_VALUE loc, offset, variable + if (MI->getNumOperands() != 3 || + !MI->getOperand(1).isImm() || !MI->getOperand(2).isMetadata()) { + DEBUG(dbgs() << "Can't handle " << *MI); + return false; + } + + // Get or create the UserValue for (variable,offset). + unsigned Offset = MI->getOperand(1).getImm(); + const MDNode *Var = MI->getOperand(2).getMetadata(); + UserValue *UV = getUserValue(Var, Offset, MI->getDebugLoc()); + + // If the location is a virtual register, make sure it is mapped. + if (MI->getOperand(0).isReg()) { + unsigned Reg = MI->getOperand(0).getReg(); + if (TargetRegisterInfo::isVirtualRegister(Reg)) + mapVirtReg(Reg, UV); + } + + UV->addDef(Idx, MI->getOperand(0)); + return true; +} + +bool LDVImpl::collectDebugValues(MachineFunction &mf) { + bool Changed = false; + for (MachineFunction::iterator MFI = mf.begin(), MFE = mf.end(); MFI != MFE; + ++MFI) { + MachineBasicBlock *MBB = MFI; + for (MachineBasicBlock::iterator MBBI = MBB->begin(), MBBE = MBB->end(); + MBBI != MBBE;) { + if (!MBBI->isDebugValue()) { + ++MBBI; + continue; + } + // DBG_VALUE has no slot index, use the previous instruction instead. + SlotIndex Idx = MBBI == MBB->begin() ? + LIS->getMBBStartIdx(MBB) : + LIS->getInstructionIndex(llvm::prior(MBBI)).getDefIndex(); + // Handle consecutive DBG_VALUE instructions with the same slot index. + do { + if (handleDebugValue(MBBI, Idx)) { + MBBI = MBB->erase(MBBI); + Changed = true; + } else + ++MBBI; + } while (MBBI != MBBE && MBBI->isDebugValue()); + } + } + return Changed; +} + +void UserValue::extendDef(SlotIndex Idx, unsigned LocNo, + LiveInterval *LI, const VNInfo *VNI, + LiveIntervals &LIS, MachineDominatorTree &MDT) { + SmallVector<SlotIndex, 16> Todo; + Todo.push_back(Idx); + + do { + SlotIndex Start = Todo.pop_back_val(); + MachineBasicBlock *MBB = LIS.getMBBFromIndex(Start); + SlotIndex Stop = LIS.getMBBEndIdx(MBB); + LocMap::iterator I = locInts.find(Start); + + // Limit to VNI's live range. + bool ToEnd = true; + if (LI && VNI) { + LiveRange *Range = LI->getLiveRangeContaining(Start); + if (!Range || Range->valno != VNI) + continue; + if (Range->end < Stop) + Stop = Range->end, ToEnd = false; + } + + // There could already be a short def at Start. + if (I.valid() && I.start() <= Start) { + // Stop when meeting a different location or an already extended interval. + Start = Start.getNextSlot(); + if (I.value() != LocNo || I.stop() != Start) + continue; + // This is a one-slot placeholder. Just skip it. + ++I; + } + + // Limited by the next def. + if (I.valid() && I.start() < Stop) + Stop = I.start(), ToEnd = false; + + if (Start >= Stop) + continue; + + I.insert(Start, Stop, LocNo); + + // If we extended to the MBB end, propagate down the dominator tree. + if (!ToEnd) + continue; + const std::vector<MachineDomTreeNode*> &Children = + MDT.getNode(MBB)->getChildren(); + for (unsigned i = 0, e = Children.size(); i != e; ++i) + Todo.push_back(LIS.getMBBStartIdx(Children[i]->getBlock())); + } while (!Todo.empty()); +} + +void +UserValue::computeIntervals(LiveIntervals &LIS, MachineDominatorTree &MDT) { + SmallVector<std::pair<SlotIndex, unsigned>, 16> Defs; + + // Collect all defs to be extended (Skipping undefs). + for (LocMap::const_iterator I = locInts.begin(); I.valid(); ++I) + if (I.value() != ~0u) + Defs.push_back(std::make_pair(I.start(), I.value())); + + for (unsigned i = 0, e = Defs.size(); i != e; ++i) { + SlotIndex Idx = Defs[i].first; + unsigned LocNo = Defs[i].second; + const MachineOperand &Loc = locations[LocNo]; + + // Register locations are constrained to where the register value is live. + if (Loc.isReg() && LIS.hasInterval(Loc.getReg())) { + LiveInterval *LI = &LIS.getInterval(Loc.getReg()); + const VNInfo *VNI = LI->getVNInfoAt(Idx); + extendDef(Idx, LocNo, LI, VNI, LIS, MDT); + } else + extendDef(Idx, LocNo, 0, 0, LIS, MDT); + } + + // Finally, erase all the undefs. + for (LocMap::iterator I = locInts.begin(); I.valid();) + if (I.value() == ~0u) + I.erase(); + else + ++I; +} + +void LDVImpl::computeIntervals() { + for (unsigned i = 0, e = userValues.size(); i != e; ++i) + userValues[i]->computeIntervals(*LIS, *MDT); +} + +bool LDVImpl::runOnMachineFunction(MachineFunction &mf) { + MF = &mf; + LIS = &pass.getAnalysis<LiveIntervals>(); + MDT = &pass.getAnalysis<MachineDominatorTree>(); + TRI = mf.getTarget().getRegisterInfo(); + clear(); + DEBUG(dbgs() << "********** COMPUTING LIVE DEBUG VARIABLES: " + << ((Value*)mf.getFunction())->getName() + << " **********\n"); + + bool Changed = collectDebugValues(mf); + computeIntervals(); + DEBUG(print(dbgs())); + return Changed; +} + +bool LiveDebugVariables::runOnMachineFunction(MachineFunction &mf) { + if (!EnableLDV) + return false; + if (!pImpl) + pImpl = new LDVImpl(this); + return static_cast<LDVImpl*>(pImpl)->runOnMachineFunction(mf); +} + +void LiveDebugVariables::releaseMemory() { + if (pImpl) + static_cast<LDVImpl*>(pImpl)->clear(); +} + +LiveDebugVariables::~LiveDebugVariables() { + if (pImpl) + delete static_cast<LDVImpl*>(pImpl); +} + +void UserValue:: +renameRegister(unsigned OldReg, unsigned NewReg, unsigned SubIdx, + const TargetRegisterInfo *TRI) { + for (unsigned i = locations.size(); i; --i) { + unsigned LocNo = i - 1; + MachineOperand &Loc = locations[LocNo]; + if (!Loc.isReg() || Loc.getReg() != OldReg) + continue; + if (TargetRegisterInfo::isPhysicalRegister(NewReg)) + Loc.substPhysReg(NewReg, *TRI); + else + Loc.substVirtReg(NewReg, SubIdx, *TRI); + coalesceLocation(LocNo); + } +} + +void LDVImpl:: +renameRegister(unsigned OldReg, unsigned NewReg, unsigned SubIdx) { + UserValue *UV = lookupVirtReg(OldReg); + if (!UV) + return; + + if (TargetRegisterInfo::isVirtualRegister(NewReg)) + mapVirtReg(NewReg, UV); + virtRegToEqClass.erase(OldReg); + + do { + UV->renameRegister(OldReg, NewReg, SubIdx, TRI); + UV = UV->getNext(); + } while (UV); +} + +void LiveDebugVariables:: +renameRegister(unsigned OldReg, unsigned NewReg, unsigned SubIdx) { + if (pImpl) + static_cast<LDVImpl*>(pImpl)->renameRegister(OldReg, NewReg, SubIdx); +} + +void +UserValue::rewriteLocations(VirtRegMap &VRM, const TargetRegisterInfo &TRI) { + // Iterate over locations in reverse makes it easier to handle coalescing. + for (unsigned i = locations.size(); i ; --i) { + unsigned LocNo = i-1; + MachineOperand &Loc = locations[LocNo]; + // Only virtual registers are rewritten. + if (!Loc.isReg() || !Loc.getReg() || + !TargetRegisterInfo::isVirtualRegister(Loc.getReg())) + continue; + unsigned VirtReg = Loc.getReg(); + if (VRM.isAssignedReg(VirtReg) && + TargetRegisterInfo::isPhysicalRegister(VRM.getPhys(VirtReg))) { + Loc.substPhysReg(VRM.getPhys(VirtReg), TRI); + } else if (VRM.getStackSlot(VirtReg) != VirtRegMap::NO_STACK_SLOT && + VRM.isSpillSlotUsed(VRM.getStackSlot(VirtReg))) { + // FIXME: Translate SubIdx to a stackslot offset. + Loc = MachineOperand::CreateFI(VRM.getStackSlot(VirtReg)); + } else { + Loc.setReg(0); + Loc.setSubReg(0); + } + coalesceLocation(LocNo); + } + DEBUG(print(dbgs(), &TRI)); +} + +/// findInsertLocation - Find an iterator for inserting a DBG_VALUE +/// instruction. +static MachineBasicBlock::iterator +findInsertLocation(MachineBasicBlock *MBB, SlotIndex Idx, + LiveIntervals &LIS) { + SlotIndex Start = LIS.getMBBStartIdx(MBB); + Idx = Idx.getBaseIndex(); + + // Try to find an insert location by going backwards from Idx. + MachineInstr *MI; + while (!(MI = LIS.getInstructionFromIndex(Idx))) { + // We've reached the beginning of MBB. + if (Idx == Start) { + MachineBasicBlock::iterator I = MBB->SkipPHIsAndLabels(MBB->begin()); + return I; + } + Idx = Idx.getPrevIndex(); + } + + // Don't insert anything after the first terminator, though. + return MI->getDesc().isTerminator() ? MBB->getFirstTerminator() : + llvm::next(MachineBasicBlock::iterator(MI)); +} + +DebugLoc UserValue::findDebugLoc() { + DebugLoc D = dl; + dl = DebugLoc(); + return D; +} +void UserValue::insertDebugValue(MachineBasicBlock *MBB, SlotIndex Idx, + unsigned LocNo, + LiveIntervals &LIS, + const TargetInstrInfo &TII) { + MachineBasicBlock::iterator I = findInsertLocation(MBB, Idx, LIS); + MachineOperand &Loc = locations[LocNo]; + + // Frame index locations may require a target callback. + if (Loc.isFI()) { + MachineInstr *MI = TII.emitFrameIndexDebugValue(*MBB->getParent(), + Loc.getIndex(), offset, variable, + findDebugLoc()); + if (MI) { + MBB->insert(I, MI); + return; + } + } + // This is not a frame index, or the target is happy with a standard FI. + BuildMI(*MBB, I, findDebugLoc(), TII.get(TargetOpcode::DBG_VALUE)) + .addOperand(Loc).addImm(offset).addMetadata(variable); +} + +void UserValue::insertDebugKill(MachineBasicBlock *MBB, SlotIndex Idx, + LiveIntervals &LIS, const TargetInstrInfo &TII) { + MachineBasicBlock::iterator I = findInsertLocation(MBB, Idx, LIS); + BuildMI(*MBB, I, findDebugLoc(), TII.get(TargetOpcode::DBG_VALUE)).addReg(0) + .addImm(offset).addMetadata(variable); +} + +void UserValue::emitDebugValues(VirtRegMap *VRM, LiveIntervals &LIS, + const TargetInstrInfo &TII) { + MachineFunction::iterator MFEnd = VRM->getMachineFunction().end(); + + for (LocMap::const_iterator I = locInts.begin(); I.valid();) { + SlotIndex Start = I.start(); + SlotIndex Stop = I.stop(); + unsigned LocNo = I.value(); + DEBUG(dbgs() << "\t[" << Start << ';' << Stop << "):" << LocNo); + MachineFunction::iterator MBB = LIS.getMBBFromIndex(Start); + SlotIndex MBBEnd = LIS.getMBBEndIdx(MBB); + + DEBUG(dbgs() << " BB#" << MBB->getNumber() << '-' << MBBEnd); + insertDebugValue(MBB, Start, LocNo, LIS, TII); + + // This interval may span multiple basic blocks. + // Insert a DBG_VALUE into each one. + while(Stop > MBBEnd) { + // Move to the next block. + Start = MBBEnd; + if (++MBB == MFEnd) + break; + MBBEnd = LIS.getMBBEndIdx(MBB); + DEBUG(dbgs() << " BB#" << MBB->getNumber() << '-' << MBBEnd); + insertDebugValue(MBB, Start, LocNo, LIS, TII); + } + DEBUG(dbgs() << '\n'); + if (MBB == MFEnd) + break; + + ++I; + if (Stop == MBBEnd) + continue; + // The current interval ends before MBB. + // Insert a kill if there is a gap. + if (!I.valid() || I.start() > Stop) + insertDebugKill(MBB, Stop, LIS, TII); + } +} + +void LDVImpl::emitDebugValues(VirtRegMap *VRM) { + DEBUG(dbgs() << "********** EMITTING LIVE DEBUG VARIABLES **********\n"); + const TargetInstrInfo *TII = MF->getTarget().getInstrInfo(); + for (unsigned i = 0, e = userValues.size(); i != e; ++i) { + userValues[i]->rewriteLocations(*VRM, *TRI); + userValues[i]->emitDebugValues(VRM, *LIS, *TII); + } +} + +void LiveDebugVariables::emitDebugValues(VirtRegMap *VRM) { + if (pImpl) + static_cast<LDVImpl*>(pImpl)->emitDebugValues(VRM); +} + + +#ifndef NDEBUG +void LiveDebugVariables::dump() { + if (pImpl) + static_cast<LDVImpl*>(pImpl)->print(dbgs()); +} +#endif + |