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Revert "[DebugInfo] Handle multiple variable location operands in IR"

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This caused non-deterministic compiler output; see comment on the
code review.

> This patch updates the various IR passes to correctly handle dbg.values with a
> DIArgList location. This patch does not actually allow DIArgLists to be produced
> by salvageDebugInfo, and it does not affect any pass after codegen-prepare.
> Other than that, it should cover every IR pass.
>
> Most of the changes simply extend code that operated on a single debug value to
> operate on the list of debug values in the style of any_of, all_of, for_each,
> etc. Instances of setOperand(0, ...) have been replaced with with
> replaceVariableLocationOp, which takes the value that is being replaced as an
> additional argument. In places where this value isn't readily available, we have
> to track the old value through to the point where it gets replaced.
>
> Differential Revision: https://reviews.llvm.org/D88232

This reverts commit df69c69427dea7f5b3b3a4d4564bc77b0926ec88.
This commit is contained in:
Hans Wennborg 2021-03-17 13:36:48 +01:00
parent 4d21b9cc78
commit d0e43622c0
19 changed files with 146 additions and 283 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
include/llvm/IR/IntrinsicInst.h
View File

@ -203,7 +203,6 @@ public:
Value *getVariableLocationOp(unsigned OpIdx) const;
void replaceVariableLocationOp(Value *OldValue, Value *NewValue);
void replaceVariableLocationOp(unsigned OpIdx, Value *NewValue);
void setVariable(DILocalVariable *NewVar) {
setArgOperand(1, MetadataAsValue::get(NewVar->getContext(), NewVar));

5
include/llvm/Transforms/Utils/Local.h
View File

@ -311,10 +311,9 @@ void salvageDebugInfoForDbgValues(Instruction &I,
/// Given an instruction \p I and DIExpression \p DIExpr operating on it, write
/// the effects of \p I into the returned DIExpression, or return nullptr if
/// it cannot be salvaged. \p StackVal: whether DW_OP_stack_value should be
/// appended to the expression. \p LocNo: the index of the location operand to
/// which \p I applies, should be 0 for debug info without a DIArgList.
/// appended to the expression.
DIExpression *salvageDebugInfoImpl(Instruction &I, DIExpression *DIExpr,
bool StackVal, unsigned LocNo);
bool StackVal);
/// Point debug users of \p From to \p To or salvage them. Use this function
/// only when replacing all uses of \p From with \p To, with a guarantee that

95
lib/CodeGen/CodeGenPrepare.cpp
View File

@ -2873,16 +2873,11 @@ class TypePromotionTransaction {
/// Keep track of the debug users.
SmallVector<DbgValueInst *, 1> DbgValues;
/// Keep track of the new value so that we can undo it by replacing
/// instances of the new value with the original value.
Value *New;
using use_iterator = SmallVectorImpl<InstructionAndIdx>::iterator;
public:
/// Replace all the use of \p Inst by \p New.
UsesReplacer(Instruction *Inst, Value *New)
: TypePromotionAction(Inst), New(New) {
UsesReplacer(Instruction *Inst, Value *New) : TypePromotionAction(Inst) {
LLVM_DEBUG(dbgs() << "Do: UsersReplacer: " << *Inst << " with " << *New
<< "\n");
// Record the original uses.
@ -2908,7 +2903,7 @@ class TypePromotionTransaction {
// the original debug uses must also be reinstated to maintain the
// correctness and utility of debug value instructions.
for (auto *DVI : DbgValues)
DVI->replaceVariableLocationOp(New, Inst);
DVI->replaceVariableLocationOp(DVI->getVariableLocationOp(0), Inst);
}
};
@ -7908,21 +7903,18 @@ bool CodeGenPrepare::fixupDbgValue(Instruction *I) {
DbgValueInst &DVI = *cast<DbgValueInst>(I);
// Does this dbg.value refer to a sunk address calculation?
bool AnyChange = false;
for (Value *Location : DVI.getValues()) {
WeakTrackingVH SunkAddrVH = SunkAddrs[Location];
Value *SunkAddr = SunkAddrVH.pointsToAliveValue() ? SunkAddrVH : nullptr;
if (SunkAddr) {
// Point dbg.value at locally computed address, which should give the best
// opportunity to be accurately lowered. This update may change the type
// of pointer being referred to; however this makes no difference to
// debugging information, and we can't generate bitcasts that may affect
// codegen.
DVI.replaceVariableLocationOp(Location, SunkAddr);
AnyChange = true;
}
Value *Location = DVI.getVariableLocationOp(0);
WeakTrackingVH SunkAddrVH = SunkAddrs[Location];
Value *SunkAddr = SunkAddrVH.pointsToAliveValue() ? SunkAddrVH : nullptr;
if (SunkAddr) {
// Point dbg.value at locally computed address, which should give the best
// opportunity to be accurately lowered. This update may change the type of
// pointer being referred to; however this makes no difference to debugging
// information, and we can't generate bitcasts that may affect codegen.
DVI.replaceVariableLocationOp(Location, SunkAddr);
return true;
}
return AnyChange;
return false;
}
// A llvm.dbg.value may be using a value before its definition, due to
@ -7941,51 +7933,30 @@ bool CodeGenPrepare::placeDbgValues(Function &F) {
if (!DVI)
continue;
SmallVector<Instruction *, 4> VIs;
for (Value *V : DVI->getValues())
if (Instruction *VI = dyn_cast_or_null<Instruction>(V))
VIs.push_back(VI);
Instruction *VI = dyn_cast_or_null<Instruction>(DVI->getValue());
// This DVI may depend on multiple instructions, complicating any
// potential sink. This block takes the defensive approach, opting to
// "undef" the DVI if it has more than one instruction and any of them do
// not dominate DVI.
for (Instruction *VI : VIs) {
if (VI->isTerminator())
continue;
if (!VI || VI->isTerminator())
continue;
// If VI is a phi in a block with an EHPad terminator, we can't insert
// after it.
if (isa<PHINode>(VI) && VI->getParent()->getTerminator()->isEHPad())
continue;
// If VI is a phi in a block with an EHPad terminator, we can't insert
// after it.
if (isa<PHINode>(VI) && VI->getParent()->getTerminator()->isEHPad())
continue;
// If the defining instruction dominates the dbg.value, we do not need
// to move the dbg.value.
if (DT.dominates(VI, DVI))
continue;
// If the defining instruction dominates the dbg.value, we do not need
// to move the dbg.value.
if (DT.dominates(VI, DVI))
continue;
// If we depend on multiple instructions and any of them doesn't
// dominate this DVI, we probably can't salvage it: moving it to
// after any of the instructions could cause us to lose the others.
if (VIs.size() > 1) {
LLVM_DEBUG(
dbgs()
<< "Unable to find valid location for Debug Value, undefing:\n"
<< *DVI);
DVI->setUndef();
break;
}
LLVM_DEBUG(dbgs() << "Moving Debug Value before :\n"
<< *DVI << ' ' << *VI);
DVI->removeFromParent();
if (isa<PHINode>(VI))
DVI->insertBefore(&*VI->getParent()->getFirstInsertionPt());
else
DVI->insertAfter(VI);
MadeChange = true;
++NumDbgValueMoved;
}
LLVM_DEBUG(dbgs() << "Moving Debug Value before :\n"
<< *DVI << ' ' << *VI);
DVI->removeFromParent();
if (isa<PHINode>(VI))
DVI->insertBefore(&*VI->getParent()->getFirstInsertionPt());
else
DVI->insertAfter(VI);
MadeChange = true;
++NumDbgValueMoved;
}
}
return MadeChange;

5
lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
View File

@ -1260,8 +1260,7 @@ void SelectionDAGBuilder::salvageUnresolvedDbgValue(DanglingDebugInfo &DDI) {
// variable. FIXME: Further work could recover those too.
while (isa<Instruction>(V)) {
Instruction &VAsInst = *cast<Instruction>(V);
// Temporary "0", awaiting real implementation.
DIExpression *NewExpr = salvageDebugInfoImpl(VAsInst, Expr, StackValue, 0);
DIExpression *NewExpr = salvageDebugInfoImpl(VAsInst, Expr, StackValue);
// If we cannot salvage any further, and haven't yet found a suitable debug
// expression, bail out.
@ -6054,7 +6053,7 @@ void SelectionDAGBuilder::visitIntrinsicCall(const CallInst &I,
DILocalVariable *Variable = DI.getVariable();
DIExpression *Expression = DI.getExpression();
dropDanglingDebugInfo(Variable, Expression);
SmallVector<Value *, 4> Values(DI.getValues());
SmallVector<Value *> Values(DI.getValues());
if (Values.empty())
return;

18
lib/IR/IntrinsicInst.cpp
View File

@ -98,24 +98,6 @@ void DbgVariableIntrinsic::replaceVariableLocationOp(Value *OldValue,
setArgOperand(
0, MetadataAsValue::get(getContext(), DIArgList::get(getContext(), MDs)));
}
void DbgVariableIntrinsic::replaceVariableLocationOp(unsigned OpIdx,
Value *NewValue) {
assert(OpIdx < getNumVariableLocationOps() && "Invalid Operand Index");
if (!hasArgList()) {
Value *NewOperand = isa<MetadataAsValue>(NewValue)
? NewValue
: MetadataAsValue::get(
getContext(), ValueAsMetadata::get(NewValue));
return setArgOperand(0, NewOperand);
}
SmallVector<ValueAsMetadata *, 4> MDs;
ValueAsMetadata *NewOperand = getAsMetadata(NewValue);
for (unsigned Idx = 0; Idx < getNumVariableLocationOps(); ++Idx)
MDs.push_back(Idx == OpIdx ? NewOperand
: getAsMetadata(getVariableLocationOp(Idx)));
setArgOperand(
0, MetadataAsValue::get(getContext(), DIArgList::get(getContext(), MDs)));
}
Optional<uint64_t> DbgVariableIntrinsic::getFragmentSizeInBits() const {
if (auto Fragment = getExpression()->getFragmentInfo())

4
lib/IR/User.cpp
View File

@ -31,10 +31,6 @@ void User::replaceUsesOfWith(Value *From, Value *To) {
// most importantly, removing "this" from the use list of "From".
setOperand(i, To);
}
if (auto DVI = dyn_cast_or_null<DbgVariableIntrinsic>(this)) {
if (is_contained(DVI->location_ops(), From))
DVI->replaceVariableLocationOp(From, To);
}
}
//===----------------------------------------------------------------------===//

7
lib/Target/AArch64/AArch64StackTagging.cpp
View File

@ -563,9 +563,10 @@ bool AArch64StackTagging::runOnFunction(Function &Fn) {
}
if (auto *DVI = dyn_cast<DbgVariableIntrinsic>(I)) {
for (Value *V : DVI->location_ops())
if (auto *AI = dyn_cast_or_null<AllocaInst>(V))
Allocas[AI].DbgVariableIntrinsics.push_back(DVI);
if (auto *AI =
dyn_cast_or_null<AllocaInst>(DVI->getVariableLocationOp(0))) {
Allocas[AI].DbgVariableIntrinsics.push_back(DVI);
}
continue;
}

2
lib/Transforms/Coroutines/CoroFrame.cpp
View File

@ -2173,7 +2173,7 @@ void coro::salvageDebugInfo(
Storage = StInst->getOperand(0);
} else if (auto *GEPInst = dyn_cast<GetElementPtrInst>(Storage)) {
Expr = llvm::salvageDebugInfoImpl(*GEPInst, Expr,
/*WithStackValue=*/false, 0);
/*WithStackValue=*/false);
if (!Expr)
return;
Storage = GEPInst->getOperand(0);

13
lib/Transforms/InstCombine/InstructionCombining.cpp
View File

@ -3586,6 +3586,15 @@ static bool TryToSinkInstruction(Instruction *I, BasicBlock *DestBlock) {
llvm::sort(DbgUsersToSink,
[](auto *A, auto *B) { return B->comesBefore(A); });
// Update the arguments of a dbg.declare instruction, so that it
// does not point into a sunk instruction.
auto updateDbgDeclare = [](DbgVariableIntrinsic *DII) {
if (!isa<DbgDeclareInst>(DII))
return false;
return true;
};
SmallVector<DbgVariableIntrinsic *, 2> DIIClones;
SmallSet<DebugVariable, 4> SunkVariables;
for (auto User : DbgUsersToSink) {
@ -3593,7 +3602,7 @@ static bool TryToSinkInstruction(Instruction *I, BasicBlock *DestBlock) {
// one per variable fragment. It should be left in the original place
// because the sunk instruction is not an alloca (otherwise we could not be
// here).
if (isa<DbgDeclareInst>(User))
if (updateDbgDeclare(User))
continue;
DebugVariable DbgUserVariable =
@ -3604,8 +3613,6 @@ static bool TryToSinkInstruction(Instruction *I, BasicBlock *DestBlock) {
continue;
DIIClones.emplace_back(cast<DbgVariableIntrinsic>(User->clone()));
if (isa<DbgDeclareInst>(User) && isa<CastInst>(I))
DIIClones.back()->replaceVariableLocationOp(I, I->getOperand(0));
LLVM_DEBUG(dbgs() << "CLONE: " << *DIIClones.back() << '\n');
}

27
lib/Transforms/Instrumentation/HWAddressSanitizer.cpp
View File

@ -1218,10 +1218,10 @@ bool HWAddressSanitizer::sanitizeFunction(Function &F) {
isa<CleanupReturnInst>(Inst))
RetVec.push_back(&Inst);
if (auto *DVI = dyn_cast<DbgVariableIntrinsic>(&Inst))
for (Value *V : DVI->location_ops())
if (auto *Alloca = dyn_cast_or_null<AllocaInst>(V))
AllocaDbgMap[Alloca].push_back(DVI);
if (auto *DDI = dyn_cast<DbgVariableIntrinsic>(&Inst))
if (auto *Alloca =
dyn_cast_or_null<AllocaInst>(DDI->getVariableLocationOp(0)))
AllocaDbgMap[Alloca].push_back(DDI);
if (InstrumentLandingPads && isa<LandingPadInst>(Inst))
LandingPadVec.push_back(&Inst);
@ -1297,18 +1297,13 @@ bool HWAddressSanitizer::sanitizeFunction(Function &F) {
}
if (!AllocaToPaddedAllocaMap.empty()) {
for (auto &BB : F) {
for (auto &Inst : BB) {
if (auto *DVI = dyn_cast<DbgVariableIntrinsic>(&Inst)) {
for (Value *V : DVI->location_ops()) {
if (auto *AI = dyn_cast_or_null<AllocaInst>(V)) {
if (auto *NewAI = AllocaToPaddedAllocaMap.lookup(AI))
DVI->replaceVariableLocationOp(V, NewAI);
}
}
}
}
}
for (auto &BB : F)
for (auto &Inst : BB)
if (auto *DVI = dyn_cast<DbgVariableIntrinsic>(&Inst))
if (auto *AI =
dyn_cast_or_null<AllocaInst>(DVI->getVariableLocationOp(0)))
if (auto *NewAI = AllocaToPaddedAllocaMap.lookup(AI))
DVI->replaceVariableLocationOp(AI, NewAI);
for (auto &P : AllocaToPaddedAllocaMap)
P.first->eraseFromParent();
}

10
lib/Transforms/Scalar/ADCE.cpp
View File

@ -521,14 +521,10 @@ bool AggressiveDeadCodeElimination::removeDeadInstructions() {
// If intrinsic is pointing at a live SSA value, there may be an
// earlier optimization bug: if we know the location of the variable,
// why isn't the scope of the location alive?
for (Value *V : DII->location_ops()) {
if (Instruction *II = dyn_cast<Instruction>(V)) {
if (isLive(II)) {
if (Value *V = DII->getVariableLocationOp(0))
if (Instruction *II = dyn_cast<Instruction>(V))
if (isLive(II))
dbgs() << "Dropping debug info for " << *DII << "\n";
break;
}
}
}
}
}
});

73
lib/Transforms/Scalar/LoopStrengthReduce.cpp
View File

@ -5829,71 +5829,57 @@ void LoopStrengthReduce::getAnalysisUsage(AnalysisUsage &AU) const {
AU.addPreserved<MemorySSAWrapperPass>();
}
using EqualValues = SmallVector<std::tuple<WeakVH, int64_t>, 4>;
using EqualValuesMap =
DenseMap<std::pair<DbgValueInst *, unsigned>, EqualValues>;
using ExpressionMap = DenseMap<DbgValueInst *, DIExpression *>;
using EqualValues = SmallVector<std::tuple<WeakVH, int64_t, DIExpression *>, 4>;
using EqualValuesMap = DenseMap<DbgValueInst *, EqualValues>;
static void DbgGatherEqualValues(Loop *L, ScalarEvolution &SE,
EqualValuesMap &DbgValueToEqualSet,
ExpressionMap &DbgValueToExpression) {
EqualValuesMap &DbgValueToEqualSet) {
for (auto &B : L->getBlocks()) {
for (auto &I : *B) {
auto DVI = dyn_cast<DbgValueInst>(&I);
if (!DVI)
continue;
for (unsigned Idx = 0; Idx < DVI->getNumVariableLocationOps(); ++Idx) {
// TODO: We can duplicate results if the same arg appears more than
// once.
Value *V = DVI->getVariableLocationOp(Idx);
if (!V || !SE.isSCEVable(V->getType()))
auto V = DVI->getVariableLocationOp(0);
if (!V || !SE.isSCEVable(V->getType()))
continue;
auto DbgValueSCEV = SE.getSCEV(V);
EqualValues EqSet;
for (PHINode &Phi : L->getHeader()->phis()) {
if (V->getType() != Phi.getType())
continue;
auto DbgValueSCEV = SE.getSCEV(V);
EqualValues EqSet;
for (PHINode &Phi : L->getHeader()->phis()) {
if (V->getType() != Phi.getType())
continue;
if (!SE.isSCEVable(Phi.getType()))
continue;
auto PhiSCEV = SE.getSCEV(&Phi);
Optional<APInt> Offset =
SE.computeConstantDifference(DbgValueSCEV, PhiSCEV);
if (Offset && Offset->getMinSignedBits() <= 64)
EqSet.emplace_back(
std::make_tuple(&Phi, Offset.getValue().getSExtValue()));
}
DbgValueToEqualSet[{DVI, Idx}] = std::move(EqSet);
DbgValueToExpression[DVI] = DVI->getExpression();
if (!SE.isSCEVable(Phi.getType()))
continue;
auto PhiSCEV = SE.getSCEV(&Phi);
Optional<APInt> Offset =
SE.computeConstantDifference(DbgValueSCEV, PhiSCEV);
if (Offset && Offset->getMinSignedBits() <= 64)
EqSet.emplace_back(std::make_tuple(
&Phi, Offset.getValue().getSExtValue(), DVI->getExpression()));
}
DbgValueToEqualSet[DVI] = std::move(EqSet);
}
}
}
static void DbgApplyEqualValues(EqualValuesMap &DbgValueToEqualSet,
ExpressionMap &DbgValueToExpression) {
static void DbgApplyEqualValues(EqualValuesMap &DbgValueToEqualSet) {
for (auto A : DbgValueToEqualSet) {
auto DVI = A.first.first;
auto Idx = A.first.second;
auto DVI = A.first;
// Only update those that are now undef.
if (!isa_and_nonnull<UndefValue>(DVI->getVariableLocationOp(Idx)))
if (!isa_and_nonnull<UndefValue>(DVI->getVariableLocationOp(0)))
continue;
for (auto EV : A.second) {
auto EVHandle = std::get<WeakVH>(EV);
if (!EVHandle)
auto V = std::get<WeakVH>(EV);
if (!V)
continue;
// The dbg.value may have had its value changed by LSR; refresh it from
// the map, but continue to update the mapped expression as it may be
// updated multiple times in this function.
auto DbgDIExpr = DbgValueToExpression[DVI];
auto DbgDIExpr = std::get<DIExpression *>(EV);
auto Offset = std::get<int64_t>(EV);
DVI->replaceVariableLocationOp(Idx, EVHandle);
DVI->replaceVariableLocationOp(DVI->getVariableLocationOp(0), V);
if (Offset) {
SmallVector<uint64_t, 8> Ops;
DIExpression::appendOffset(Ops, Offset);
DbgDIExpr = DIExpression::appendOpsToArg(DbgDIExpr, Ops, Idx, true);
DbgDIExpr = DIExpression::prependOpcodes(DbgDIExpr, Ops, true);
}
DVI->setExpression(DbgDIExpr);
DbgValueToExpression[DVI] = DbgDIExpr;
break;
}
}
@ -5917,8 +5903,7 @@ static bool ReduceLoopStrength(Loop *L, IVUsers &IU, ScalarEvolution &SE,
// Debug preservation - before we start removing anything create equivalence
// sets for the llvm.dbg.value intrinsics.
EqualValuesMap DbgValueToEqualSet;
ExpressionMap DbgValueToExpression;
DbgGatherEqualValues(L, SE, DbgValueToEqualSet, DbgValueToExpression);
DbgGatherEqualValues(L, SE, DbgValueToEqualSet);
// Remove any extra phis created by processing inner loops.
Changed |= DeleteDeadPHIs(L->getHeader(), &TLI, MSSAU.get());
@ -5938,7 +5923,7 @@ static bool ReduceLoopStrength(Loop *L, IVUsers &IU, ScalarEvolution &SE,
}
}
DbgApplyEqualValues(DbgValueToEqualSet, DbgValueToExpression);
DbgApplyEqualValues(DbgValueToEqualSet);
return Changed;
}

12
lib/Transforms/Scalar/SpeculativeExecution.cpp
View File

@ -266,13 +266,11 @@ bool SpeculativeExecutionPass::considerHoistingFromTo(
const auto AllPrecedingUsesFromBlockHoisted = [&NotHoisted](const User *U) {
// Debug variable has special operand to check it's not hoisted.
if (const auto *DVI = dyn_cast<DbgVariableIntrinsic>(U)) {
return all_of(DVI->location_ops(), [&NotHoisted](Value *V) {
if (const auto *I = dyn_cast_or_null<Instruction>(V)) {
if (NotHoisted.count(I) == 0)
return true;
}
return false;
});
if (const auto *I =
dyn_cast_or_null<Instruction>(DVI->getVariableLocationOp(0)))
if (NotHoisted.count(I) == 0)
return true;
return false;
}
// Usially debug label instrinsic corresponds to label in LLVM IR. In these

9
lib/Transforms/Utils/BasicBlockUtils.cpp
View File

@ -407,8 +407,7 @@ static bool removeRedundantDbgInstrsUsingBackwardScan(BasicBlock *BB) {
/// - Keep track of non-overlapping fragments.
static bool removeRedundantDbgInstrsUsingForwardScan(BasicBlock *BB) {
SmallVector<DbgValueInst *, 8> ToBeRemoved;
DenseMap<DebugVariable, std::pair<SmallVector<Value *, 4>, DIExpression *>>
VariableMap;
DenseMap<DebugVariable, std::pair<Value *, DIExpression *> > VariableMap;
for (auto &I : *BB) {
if (DbgValueInst *DVI = dyn_cast<DbgValueInst>(&I)) {
DebugVariable Key(DVI->getVariable(),
@ -417,10 +416,10 @@ static bool removeRedundantDbgInstrsUsingForwardScan(BasicBlock *BB) {
auto VMI = VariableMap.find(Key);
// Update the map if we found a new value/expression describing the
// variable, or if the variable wasn't mapped already.
SmallVector<Value *, 4> Values(DVI->getValues());
if (VMI == VariableMap.end() || VMI->second.first != Values ||
if (VMI == VariableMap.end() ||
VMI->second.first != DVI->getValue() ||
VMI->second.second != DVI->getExpression()) {
VariableMap[Key] = {Values, DVI->getExpression()};
VariableMap[Key] = { DVI->getValue(), DVI->getExpression() };
continue;
}
// Found an identical mapping. Remember the instruction for later removal.

25
lib/Transforms/Utils/CodeExtractor.cpp
View File

@ -1511,19 +1511,20 @@ static void fixupDebugInfoPostExtraction(Function &OldFunc, Function &NewFunc,
continue;
}
auto IsInvalidLocation = [&NewFunc](Value *Location) {
// Location is invalid if it isn't a constant or an instruction, or is an
// instruction but isn't in the new function.
if (!Location ||
(!isa<Constant>(Location) && !isa<Instruction>(Location)))
return true;
Instruction *LocationInst = dyn_cast<Instruction>(Location);
return LocationInst && LocationInst->getFunction() != &NewFunc;
};
// If the location isn't a constant or an instruction, delete the
// intrinsic.
auto *DVI = cast<DbgVariableIntrinsic>(DII);
// If any of the used locations are invalid, delete the intrinsic.
if (any_of(DVI->location_ops(), IsInvalidLocation)) {
Value *Location = DVI->getVariableLocationOp(0);
if (!Location ||
(!isa<Constant>(Location) && !isa<Instruction>(Location))) {
DebugIntrinsicsToDelete.push_back(DVI);
continue;
}
// If the variable location is an instruction but isn't in the new
// function, delete the intrinsic.
Instruction *LocationInst = dyn_cast<Instruction>(Location);
if (LocationInst && LocationInst->getFunction() != &NewFunc) {
DebugIntrinsicsToDelete.push_back(DVI);
continue;
}

7
lib/Transforms/Utils/Debugify.cpp
View File

@ -554,16 +554,15 @@ bool diagnoseMisSizedDbgValue(Module &M, DbgValueInst *DVI) {
//
// TODO: This, along with a check for non-null value operands, should be
// promoted to verifier failures.
Value *V = DVI->getValue();
if (!V)
return false;
// For now, don't try to interpret anything more complicated than an empty
// DIExpression. Eventually we should try to handle OP_deref and fragments.
if (DVI->getExpression()->getNumElements())
return false;
Value *V = DVI->getVariableLocationOp(0);
if (!V)
return false;
Type *Ty = V->getType();
uint64_t ValueOperandSize = getAllocSizeInBits(M, Ty);
Optional<uint64_t> DbgVarSize = DVI->getFragmentSizeInBits();

104
lib/Transforms/Utils/Local.cpp
View File

@ -411,7 +411,7 @@ bool llvm::wouldInstructionBeTriviallyDead(Instruction *I,
return true;
}
if (DbgValueInst *DVI = dyn_cast<DbgValueInst>(I)) {
if (DVI->hasArgList() || DVI->getValue(0))
if (DVI->getValue())
return false;
return true;
}
@ -1360,7 +1360,7 @@ static bool PhiHasDebugValue(DILocalVariable *DIVar,
SmallVector<DbgValueInst *, 1> DbgValues;
findDbgValues(DbgValues, APN);
for (auto *DVI : DbgValues) {
assert(is_contained(DVI->getValues(), APN));
assert(DVI->getValue() == APN);
if ((DVI->getVariable() == DIVar) && (DVI->getExpression() == DIExpr))
return true;
}
@ -1387,19 +1387,13 @@ static bool valueCoversEntireFragment(Type *ValTy, DbgVariableIntrinsic *DII) {
// We can't always calculate the size of the DI variable (e.g. if it is a
// VLA). Try to use the size of the alloca that the dbg intrinsic describes
// intead.
if (DII->isAddressOfVariable()) {
// DII should have exactly 1 location when it is an address.
assert(DII->getNumVariableLocationOps() == 1 &&
"address of variable must have exactly 1 location operand.");
if (auto *AI =
dyn_cast_or_null<AllocaInst>(DII->getVariableLocationOp(0))) {
if (DII->isAddressOfVariable())
if (auto *AI = dyn_cast_or_null<AllocaInst>(DII->getVariableLocationOp(0)))
if (Optional<TypeSize> FragmentSize = AI->getAllocationSizeInBits(DL)) {
assert(ValueSize.isScalable() == FragmentSize->isScalable() &&
"Both sizes should agree on the scalable flag.");
return TypeSize::isKnownGE(ValueSize, *FragmentSize);
}
}
}
// Could not determine size of variable. Conservatively return false.
return false;
}
@ -1602,26 +1596,17 @@ void llvm::insertDebugValuesForPHIs(BasicBlock *BB,
ValueToValueMapTy DbgValueMap;
for (auto &I : *BB) {
if (auto DbgII = dyn_cast<DbgVariableIntrinsic>(&I)) {
for (Value *V : DbgII->location_ops())
if (auto *Loc = dyn_cast_or_null<PHINode>(V))
DbgValueMap.insert({Loc, DbgII});
if (auto *Loc =
dyn_cast_or_null<PHINode>(DbgII->getVariableLocationOp(0)))
DbgValueMap.insert({Loc, DbgII});
}
}
if (DbgValueMap.size() == 0)
return;
// Map a pair of the destination BB and old dbg.value to the new dbg.value,
// so that if a dbg.value is being rewritten to use more than one of the
// inserted PHIs in the same destination BB, we can update the same dbg.value
// with all the new PHIs instead of creating one copy for each.
SmallDenseMap<std::pair<BasicBlock *, DbgVariableIntrinsic *>,
DbgVariableIntrinsic *>
NewDbgValueMap;
// Then iterate through the new PHIs and look to see if they use one of the
// previously mapped PHIs. If so, create a new dbg.value intrinsic that will
// propagate the info through the new PHI. If we use more than one new PHI in
// a single destination BB with the same old dbg.value, merge the updates so
// that we get a single new dbg.value with all the new PHIs.
// previously mapped PHIs. If so, insert a new dbg.value intrinsic that will
// propagate the info through the new PHI.
for (auto PHI : InsertedPHIs) {
BasicBlock *Parent = PHI->getParent();
// Avoid inserting an intrinsic into an EH block.
@ -1631,27 +1616,15 @@ void llvm::insertDebugValuesForPHIs(BasicBlock *BB,
auto V = DbgValueMap.find(VI);
if (V != DbgValueMap.end()) {
auto *DbgII = cast<DbgVariableIntrinsic>(V->second);
auto NewDI = NewDbgValueMap.find({Parent, DbgII});
if (NewDI == NewDbgValueMap.end()) {
auto *NewDbgII = cast<DbgVariableIntrinsic>(DbgII->clone());
NewDI = NewDbgValueMap.insert({{Parent, DbgII}, NewDbgII}).first;
}
DbgVariableIntrinsic *NewDbgII = NewDI->second;
// If PHI contains VI as an operand more than once, we may
// replaced it in NewDbgII; confirm that it is present.
if (is_contained(NewDbgII->location_ops(), VI))
NewDbgII->replaceVariableLocationOp(VI, PHI);
DbgVariableIntrinsic *NewDbgII =
cast<DbgVariableIntrinsic>(DbgII->clone());
NewDbgII->replaceVariableLocationOp(VI, PHI);
auto InsertionPt = Parent->getFirstInsertionPt();
assert(InsertionPt != Parent->end() && "Ill-formed basic block");
NewDbgII->insertBefore(&*InsertionPt);
}
}
}
// Insert thew new dbg.values into their destination blocks.
for (auto DI : NewDbgValueMap) {
BasicBlock *Parent = DI.first.first;
auto *NewDbgII = DI.second;
auto InsertionPt = Parent->getFirstInsertionPt();
assert(InsertionPt != Parent->end() && "Ill-formed basic block");
NewDbgII->insertBefore(&*InsertionPt);
}
}
/// Finds all intrinsics declaring local variables as living in the memory that
@ -1692,25 +1665,11 @@ void llvm::findDbgValues(SmallVectorImpl<DbgValueInst *> &DbgValues, Value *V) {
// DenseMap lookup.
if (!V->isUsedByMetadata())
return;
// TODO: If this value appears multiple times in a DIArgList, we should still
// only add the owning DbgValueInst once; use this set to track ArgListUsers.
// This behaviour can be removed when we can automatically remove duplicates.
SmallPtrSet<DbgValueInst *, 4> EncounteredDbgValues;
if (auto *L = LocalAsMetadata::getIfExists(V)) {
if (auto *MDV = MetadataAsValue::getIfExists(V->getContext(), L)) {
if (auto *L = LocalAsMetadata::getIfExists(V))
if (auto *MDV = MetadataAsValue::getIfExists(V->getContext(), L))
for (User *U : MDV->users())
if (DbgValueInst *DVI = dyn_cast<DbgValueInst>(U))
DbgValues.push_back(DVI);
}
for (Metadata *AL : L->getAllArgListUsers()) {
if (auto *MDV = MetadataAsValue::getIfExists(V->getContext(), AL)) {
for (User *U : MDV->users())
if (DbgValueInst *DVI = dyn_cast<DbgValueInst>(U))
if (EncounteredDbgValues.insert(DVI).second)
DbgValues.push_back(DVI);
}
}
}
}
void llvm::findDbgUsers(SmallVectorImpl<DbgVariableIntrinsic *> &DbgUsers,
@ -1719,25 +1678,11 @@ void llvm::findDbgUsers(SmallVectorImpl<DbgVariableIntrinsic *> &DbgUsers,
// DenseMap lookup.
if (!V->isUsedByMetadata())
return;
// TODO: If this value appears multiple times in a DIArgList, we should still
// only add the owning DbgValueInst once; use this set to track ArgListUsers.
// This behaviour can be removed when we can automatically remove duplicates.
SmallPtrSet<DbgVariableIntrinsic *, 4> EncounteredDbgValues;
if (auto *L = LocalAsMetadata::getIfExists(V)) {
if (auto *MDV = MetadataAsValue::getIfExists(V->getContext(), L)) {
if (auto *L = LocalAsMetadata::getIfExists(V))
if (auto *MDV = MetadataAsValue::getIfExists(V->getContext(), L))
for (User *U : MDV->users())
if (DbgVariableIntrinsic *DII = dyn_cast<DbgVariableIntrinsic>(U))
DbgUsers.push_back(DII);
}
for (Metadata *AL : L->getAllArgListUsers()) {
if (auto *MDV = MetadataAsValue::getIfExists(V->getContext(), AL)) {
for (User *U : MDV->users())
if (DbgVariableIntrinsic *DII = dyn_cast<DbgVariableIntrinsic>(U))
if (EncounteredDbgValues.insert(DII).second)
DbgUsers.push_back(DII);
}
}
}
}
bool llvm::replaceDbgDeclare(Value *Address, Value *NewAddress,
@ -1807,14 +1752,9 @@ void llvm::salvageDebugInfoForDbgValues(
// are implicitly pointing out the value as a DWARF memory location
// description.
bool StackValue = isa<DbgValueInst>(DII);
auto DIILocation = DII->location_ops();
assert(
is_contained(DIILocation, &I) &&
"DbgVariableIntrinsic must use salvaged instruction as its location");
unsigned LocNo = std::distance(DIILocation.begin(), find(DIILocation, &I));
DIExpression *DIExpr =
salvageDebugInfoImpl(I, DII->getExpression(), StackValue, LocNo);
salvageDebugInfoImpl(I, DII->getExpression(), StackValue);
// salvageDebugInfoImpl should fail on examining the first element of
// DbgUsers, or none of them.
@ -1907,7 +1847,7 @@ bool getSalvageOpsForBinOp(BinaryOperator *BI,
DIExpression *llvm::salvageDebugInfoImpl(Instruction &I,
DIExpression *SrcDIExpr,
bool WithStackValue, unsigned LocNo) {
bool WithStackValue) {
auto &M = *I.getModule();
auto &DL = M.getDataLayout();
@ -1915,7 +1855,7 @@ DIExpression *llvm::salvageDebugInfoImpl(Instruction &I,
auto doSalvage = [&](SmallVectorImpl<uint64_t> &Ops) -> DIExpression * {
DIExpression *DIExpr = SrcDIExpr;
if (!Ops.empty()) {
DIExpr = DIExpression::appendOpsToArg(DIExpr, Ops, LocNo, WithStackValue);
DIExpr = DIExpression::prependOpcodes(DIExpr, Ops, WithStackValue);
}
return DIExpr;
};

9
lib/Transforms/Utils/LoopRotationUtils.cpp
View File

@ -384,14 +384,11 @@ bool LoopRotate::rotateLoop(Loop *L, bool SimplifiedLatch) {
// possible or create a clone in the OldPreHeader if not.
Instruction *LoopEntryBranch = OrigPreheader->getTerminator();
// Record all debug intrinsics preceding LoopEntryBranch to avoid
// duplication.
// Record all debug intrinsics preceding LoopEntryBranch to avoid duplication.
using DbgIntrinsicHash =
std::pair<std::pair<hash_code, DILocalVariable *>, DIExpression *>;
std::pair<std::pair<Value *, DILocalVariable *>, DIExpression *>;
auto makeHash = [](DbgVariableIntrinsic *D) -> DbgIntrinsicHash {
auto VarLocOps = D->location_ops();
return {{hash_combine_range(VarLocOps.begin(), VarLocOps.end()),
D->getVariable()},
return {{D->getVariableLocationOp(0), D->getVariable()},
D->getExpression()};
};
SmallDenseSet<DbgIntrinsicHash, 8> DbgIntrinsics;

3
unittests/IR/DebugInfoTest.cpp
View File

@ -183,8 +183,7 @@ TEST(MetadataTest, DeleteInstUsedByDbgValue) {
// Delete %b. The dbg.value should now point to undef.
I.eraseFromParent();
EXPECT_EQ(DVIs[0]->getNumVariableLocationOps(), 1u);
EXPECT_TRUE(isa<UndefValue>(DVIs[0]->getValue(0)));
EXPECT_TRUE(isa<UndefValue>(DVIs[0]->getValue()));
}
TEST(DIBuilder, CreateFortranArrayTypeWithAttributes) {