#define DEBUG_TYPE "livedebug"
#include "LiveDebugVariables.h"
-#include "VirtRegMap.h"
-#include "llvm/Constants.h"
-#include "llvm/Metadata.h"
-#include "llvm/Value.h"
-#include "llvm/Analysis/DebugInfo.h"
#include "llvm/ADT/IntervalMap.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/CodeGen/LexicalScopes.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/CodeGen/Passes.h"
+#include "llvm/CodeGen/VirtRegMap.h"
+#include "llvm/DebugInfo.h"
+#include "llvm/IR/Constants.h"
+#include "llvm/IR/Metadata.h"
+#include "llvm/IR/Value.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Target/TargetInstrInfo.h"
class UserValue {
const MDNode *variable; ///< The debug info variable we are part of.
unsigned offset; ///< Byte offset into variable.
+ bool IsIndirect; ///< true if this is a register-indirect+offset value.
DebugLoc dl; ///< The debug location for the variable. This is
///< used by dwarf writer to find lexical scope.
UserValue *leader; ///< Equivalence class leader.
/// splitLocation - Replace OldLocNo ranges with NewRegs ranges where NewRegs
/// is live. Returns true if any changes were made.
- bool splitLocation(unsigned OldLocNo, ArrayRef<LiveInterval*> NewRegs);
+ bool splitLocation(unsigned OldLocNo, ArrayRef<unsigned> NewRegs,
+ LiveIntervals &LIS);
public:
/// UserValue - Create a new UserValue.
- UserValue(const MDNode *var, unsigned o, DebugLoc L,
+ UserValue(const MDNode *var, unsigned o, bool i, DebugLoc L,
LocMap::Allocator &alloc)
- : variable(var), offset(o), dl(L), leader(this), next(0), locInts(alloc)
+ : variable(var), offset(o), IsIndirect(i), dl(L), leader(this),
+ next(0), locInts(alloc)
{}
/// getLeader - Get the leader of this value's equivalence class.
/// computeIntervals - Compute the live intervals of all locations after
/// collecting all their def points.
- void computeIntervals(MachineRegisterInfo &MRI,
+ void computeIntervals(MachineRegisterInfo &MRI, const TargetRegisterInfo &TRI,
LiveIntervals &LIS, MachineDominatorTree &MDT,
UserValueScopes &UVS);
- /// renameRegister - Update locations to rewrite OldReg as NewReg:SubIdx.
- void renameRegister(unsigned OldReg, unsigned NewReg, unsigned SubIdx,
- const TargetRegisterInfo *TRI);
-
/// splitRegister - Replace OldReg ranges with NewRegs ranges where NewRegs is
/// live. Returns true if any changes were made.
- bool splitRegister(unsigned OldLocNo, ArrayRef<LiveInterval*> NewRegs);
+ bool splitRegister(unsigned OldLocNo, ArrayRef<unsigned> NewRegs,
+ LiveIntervals &LIS);
/// 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.
+ /// emitDebugValues - Recreate DBG_VALUE instruction from data structures.
void emitDebugValues(VirtRegMap *VRM,
LiveIntervals &LIS, const TargetInstrInfo &TRI);
MachineDominatorTree *MDT;
const TargetRegisterInfo *TRI;
+ /// Whether emitDebugValues is called.
+ bool EmitDone;
+ /// Whether the machine function is modified during the pass.
+ bool ModifiedMF;
+
/// userValues - All allocated UserValue instances.
SmallVector<UserValue*, 8> userValues;
UVMap userVarMap;
/// getUserValue - Find or create a UserValue.
- UserValue *getUserValue(const MDNode *Var, unsigned Offset, DebugLoc DL);
+ UserValue *getUserValue(const MDNode *Var, unsigned Offset,
+ bool IsIndirect, DebugLoc DL);
/// lookupVirtReg - Find the EC leader for VirtReg or null.
UserValue *lookupVirtReg(unsigned VirtReg);
void computeIntervals();
public:
- LDVImpl(LiveDebugVariables *ps) : pass(*ps) {}
+ LDVImpl(LiveDebugVariables *ps) : pass(*ps), EmitDone(false),
+ ModifiedMF(false) {}
bool runOnMachineFunction(MachineFunction &mf);
- /// clear - Relase all memory.
+ /// clear - Release all memory.
void clear() {
DeleteContainerPointers(userValues);
userValues.clear();
virtRegToEqClass.clear();
userVarMap.clear();
+ // Make sure we call emitDebugValues if the machine function was modified.
+ assert((!ModifiedMF || EmitDone) &&
+ "Dbg values are not emitted in LDV");
+ EmitDone = false;
+ ModifiedMF = false;
}
/// mapVirtReg - Map virtual register to an equivalence class.
void mapVirtReg(unsigned VirtReg, UserValue *EC);
- /// renameRegister - Replace all references to OldReg with NewReg:SubIdx.
- void renameRegister(unsigned OldReg, unsigned NewReg, unsigned SubIdx);
-
/// splitRegister - Replace all references to OldReg with NewRegs.
- void splitRegister(unsigned OldReg, ArrayRef<LiveInterval*> NewRegs);
+ void splitRegister(unsigned OldReg, ArrayRef<unsigned> NewRegs);
- /// emitDebugVariables - Recreate DBG_VALUE instruction from data structures.
+ /// emitDebugValues - Recreate DBG_VALUE instruction from data structures.
void emitDebugValues(VirtRegMap *VRM);
void print(raw_ostream&);
}
UserValue *LDVImpl::getUserValue(const MDNode *Var, unsigned Offset,
- DebugLoc DL) {
+ bool IsIndirect, DebugLoc DL) {
UserValue *&Leader = userVarMap[Var];
if (Leader) {
UserValue *UV = Leader->getLeader();
return UV;
}
- UserValue *UV = new UserValue(Var, Offset, DL, allocator);
+ UserValue *UV = new UserValue(Var, Offset, IsIndirect, DL, allocator);
userValues.push_back(UV);
Leader = UserValue::merge(Leader, UV);
return UV;
bool LDVImpl::handleDebugValue(MachineInstr *MI, SlotIndex Idx) {
// DBG_VALUE loc, offset, variable
if (MI->getNumOperands() != 3 ||
- !MI->getOperand(1).isImm() || !MI->getOperand(2).isMetadata()) {
+ !(MI->getOperand(1).isReg() || 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();
+ bool IsIndirect = MI->isIndirectDebugValue();
+ unsigned Offset = IsIndirect ? MI->getOperand(1).getImm() : 0;
const MDNode *Var = MI->getOperand(2).getMetadata();
- UserValue *UV = getUserValue(Var, Offset, MI->getDebugLoc());
+ //here.
+ UserValue *UV = getUserValue(Var, Offset, IsIndirect, MI->getDebugLoc());
UV->addDef(Idx, MI->getOperand(0));
return true;
}
void
UserValue::computeIntervals(MachineRegisterInfo &MRI,
+ const TargetRegisterInfo &TRI,
LiveIntervals &LIS,
MachineDominatorTree &MDT,
UserValueScopes &UVS) {
unsigned LocNo = Defs[i].second;
const MachineOperand &Loc = locations[LocNo];
+ if (!Loc.isReg()) {
+ extendDef(Idx, LocNo, 0, 0, 0, LIS, MDT, UVS);
+ continue;
+ }
+
// 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);
+ if (TargetRegisterInfo::isVirtualRegister(Loc.getReg())) {
+ LiveInterval *LI = 0;
+ const VNInfo *VNI = 0;
+ if (LIS.hasInterval(Loc.getReg())) {
+ LI = &LIS.getInterval(Loc.getReg());
+ VNI = LI->getVNInfoAt(Idx);
+ }
SmallVector<SlotIndex, 16> Kills;
extendDef(Idx, LocNo, LI, VNI, &Kills, LIS, MDT, UVS);
- addDefsFromCopies(LI, LocNo, Kills, Defs, MRI, LIS);
- } else
- extendDef(Idx, LocNo, 0, 0, 0, LIS, MDT, UVS);
+ if (LI)
+ addDefsFromCopies(LI, LocNo, Kills, Defs, MRI, LIS);
+ continue;
+ }
+
+ // For physregs, use the live range of the first regunit as a guide.
+ unsigned Unit = *MCRegUnitIterator(Loc.getReg(), &TRI);
+ LiveInterval *LI = &LIS.getRegUnit(Unit);
+ const VNInfo *VNI = LI->getVNInfoAt(Idx);
+ // Don't track copies from physregs, it is too expensive.
+ extendDef(Idx, LocNo, LI, VNI, 0, LIS, MDT, UVS);
}
// Finally, erase all the undefs.
void LDVImpl::computeIntervals() {
for (unsigned i = 0, e = userValues.size(); i != e; ++i) {
UserValueScopes UVS(userValues[i]->getDebugLoc(), LS);
- userValues[i]->computeIntervals(MF->getRegInfo(), *LIS, *MDT, UVS);
+ userValues[i]->computeIntervals(MF->getRegInfo(), *TRI, *LIS, *MDT, UVS);
userValues[i]->mapVirtRegs(this);
}
}
clear();
LS.initialize(mf);
DEBUG(dbgs() << "********** COMPUTING LIVE DEBUG VARIABLES: "
- << ((Value*)mf.getFunction())->getName()
- << " **********\n");
+ << mf.getName() << " **********\n");
bool Changed = collectDebugValues(mf);
computeIntervals();
DEBUG(print(dbgs()));
LS.releaseMemory();
+ ModifiedMF = Changed;
return Changed;
}
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);
-}
-
//===----------------------------------------------------------------------===//
// Live Range Splitting
//===----------------------------------------------------------------------===//
bool
-UserValue::splitLocation(unsigned OldLocNo, ArrayRef<LiveInterval*> NewRegs) {
+UserValue::splitLocation(unsigned OldLocNo, ArrayRef<unsigned> NewRegs,
+ LiveIntervals& LIS) {
DEBUG({
dbgs() << "Splitting Loc" << OldLocNo << '\t';
print(dbgs(), 0);
LocMap::iterator LocMapI;
LocMapI.setMap(locInts);
for (unsigned i = 0; i != NewRegs.size(); ++i) {
- LiveInterval *LI = NewRegs[i];
+ LiveInterval *LI = &LIS.getInterval(NewRegs[i]);
if (LI->empty())
continue;
}
bool
-UserValue::splitRegister(unsigned OldReg, ArrayRef<LiveInterval*> NewRegs) {
+UserValue::splitRegister(unsigned OldReg, ArrayRef<unsigned> NewRegs,
+ LiveIntervals &LIS) {
bool DidChange = false;
// Split locations referring to OldReg. Iterate backwards so splitLocation can
// safely erase unused locations.
const MachineOperand *Loc = &locations[LocNo];
if (!Loc->isReg() || Loc->getReg() != OldReg)
continue;
- DidChange |= splitLocation(LocNo, NewRegs);
+ DidChange |= splitLocation(LocNo, NewRegs, LIS);
}
return DidChange;
}
-void LDVImpl::splitRegister(unsigned OldReg, ArrayRef<LiveInterval*> NewRegs) {
+void LDVImpl::splitRegister(unsigned OldReg, ArrayRef<unsigned> NewRegs) {
bool DidChange = false;
for (UserValue *UV = lookupVirtReg(OldReg); UV; UV = UV->getNext())
- DidChange |= UV->splitRegister(OldReg, NewRegs);
+ DidChange |= UV->splitRegister(OldReg, NewRegs, *LIS);
if (!DidChange)
return;
// Map all of the new virtual registers.
UserValue *UV = lookupVirtReg(OldReg);
for (unsigned i = 0; i != NewRegs.size(); ++i)
- mapVirtReg(NewRegs[i]->reg, UV);
+ mapVirtReg(NewRegs[i], UV);
}
void LiveDebugVariables::
-splitRegister(unsigned OldReg, ArrayRef<LiveInterval*> NewRegs) {
+splitRegister(unsigned OldReg, ArrayRef<unsigned> NewRegs, LiveIntervals &LIS) {
if (pImpl)
static_cast<LDVImpl*>(pImpl)->splitRegister(OldReg, NewRegs);
}
MachineOperand &Loc = locations[LocNo];
++NumInsertedDebugValues;
- // 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);
+ if (Loc.isReg())
+ BuildMI(*MBB, I, findDebugLoc(), TII.get(TargetOpcode::DBG_VALUE),
+ IsIndirect, Loc.getReg(), offset, variable);
+ else
+ BuildMI(*MBB, I, findDebugLoc(), TII.get(TargetOpcode::DBG_VALUE))
+ .addOperand(Loc).addImm(offset).addMetadata(variable);
}
void UserValue::emitDebugValues(VirtRegMap *VRM, LiveIntervals &LIS,
userValues[i]->rewriteLocations(*VRM, *TRI);
userValues[i]->emitDebugValues(VRM, *LIS, *TII);
}
+ EmitDone = true;
}
void LiveDebugVariables::emitDebugValues(VirtRegMap *VRM) {
static_cast<LDVImpl*>(pImpl)->print(dbgs());
}
#endif
-
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