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author | Orlando Cazalet-Hyams <orlando.hyams@sony.com> | 2024-02-23 11:37:21 +0000 |
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committer | GitHub <noreply@github.com> | 2024-02-23 11:37:21 +0000 |
commit | 8a164220207b579c31d6aa6552944441c83e9465 (patch) | |
tree | 41f289a6a49d3bcc4f4413217ed89baa698d7dc3 | |
parent | 3c90fce4504e22953ec5586599afaecfb2923a9e (diff) | |
download | llvm-8a164220207b579c31d6aa6552944441c83e9465.zip llvm-8a164220207b579c31d6aa6552944441c83e9465.tar.gz llvm-8a164220207b579c31d6aa6552944441c83e9465.tar.bz2 |
[RemoveDIs] Add DPLabels support [3a/3] (#82633)
Patch 2 of 3 to add llvm.dbg.label support to the RemoveDIs project. The
patch stack adds the DPLabel class, which is the RemoveDIs llvm.dbg.label
equivalent.
1. Add DbgRecord base class for DPValue and the not-yet-added
DPLabel class.
2. Add the DPLabel class.
-> 3. Add support to passes.
The next patch, #82639, will enable conversion between dbg.labels and DPLabels.
AssignemntTrackingAnalysis support could have gone two ways:
1. Have the analysis store a DPLabel representation in its results -
SelectionDAGBuilder reads the analysis results and ignores all DbgRecord
kinds.
2. Ignore DPLabels in the analysis - SelectionDAGBuilder reads the analysis
results but still needs to iterate over DPLabels from the IR.
I went with option 2 because it's less work and is no less correct than 1. It's
worth noting that causes labels to sink to the bottom of packs of debug records.
e.g., [value, label, value] becomes [value, value, label]. This shouldn't be a
problem because labels and variable locations don't have an ordering requirement.
The ordering between variable locations is maintained and the label movement is
deterministic
-rw-r--r-- | llvm/include/llvm/IR/DebugProgramInstruction.h | 10 | ||||
-rw-r--r-- | llvm/include/llvm/IR/IntrinsicInst.h | 3 | ||||
-rw-r--r-- | llvm/lib/CodeGen/AssignmentTrackingAnalysis.cpp | 9 | ||||
-rw-r--r-- | llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp | 12 | ||||
-rw-r--r-- | llvm/lib/CodeGen/SelectionDAG/FastISel.cpp | 17 | ||||
-rw-r--r-- | llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp | 29 | ||||
-rw-r--r-- | llvm/lib/IR/AsmWriter.cpp | 4 | ||||
-rw-r--r-- | llvm/lib/Transforms/Scalar/SpeculativeExecution.cpp | 6 | ||||
-rw-r--r-- | llvm/lib/Transforms/Utils/BasicBlockUtils.cpp | 10 | ||||
-rw-r--r-- | llvm/lib/Transforms/Utils/CodeExtractor.cpp | 45 | ||||
-rw-r--r-- | llvm/lib/Transforms/Utils/MemoryTaggingSupport.cpp | 3 | ||||
-rw-r--r-- | llvm/lib/Transforms/Utils/ValueMapper.cpp | 5 | ||||
-rw-r--r-- | llvm/test/Transforms/SpeculativeExecution/PR46267.ll | 5 |
13 files changed, 114 insertions, 44 deletions
diff --git a/llvm/include/llvm/IR/DebugProgramInstruction.h b/llvm/include/llvm/IR/DebugProgramInstruction.h index 1c86197..84b0f74 100644 --- a/llvm/include/llvm/IR/DebugProgramInstruction.h +++ b/llvm/include/llvm/IR/DebugProgramInstruction.h @@ -157,6 +157,11 @@ protected: ~DbgRecord() = default; }; +inline raw_ostream &operator<<(raw_ostream &OS, const DbgRecord &R) { + R.print(OS); + return OS; +} + /// Records a position in IR for a source label (DILabel). Corresponds to the /// llvm.dbg.label intrinsic. /// FIXME: Rename DbgLabelRecord when DPValue is renamed to DbgVariableRecord. @@ -536,11 +541,6 @@ inline raw_ostream &operator<<(raw_ostream &OS, const DPMarker &Marker) { return OS; } -inline raw_ostream &operator<<(raw_ostream &OS, const DPValue &Value) { - Value.print(OS); - return OS; -} - /// Inline helper to return a range of DPValues attached to a marker. It needs /// to be inlined as it's frequently called, but also come after the declaration /// of DPMarker. Thus: it's pre-declared by users like Instruction, then an diff --git a/llvm/include/llvm/IR/IntrinsicInst.h b/llvm/include/llvm/IR/IntrinsicInst.h index b8d578d..fbaaef8 100644 --- a/llvm/include/llvm/IR/IntrinsicInst.h +++ b/llvm/include/llvm/IR/IntrinsicInst.h @@ -531,6 +531,9 @@ public: class DbgLabelInst : public DbgInfoIntrinsic { public: DILabel *getLabel() const { return cast<DILabel>(getRawLabel()); } + void setLabel(DILabel *NewLabel) { + setArgOperand(0, MetadataAsValue::get(getContext(), NewLabel)); + } Metadata *getRawLabel() const { return cast<MetadataAsValue>(getArgOperand(0))->getMetadata(); diff --git a/llvm/lib/CodeGen/AssignmentTrackingAnalysis.cpp b/llvm/lib/CodeGen/AssignmentTrackingAnalysis.cpp index 7b66a85..3b84624 100644 --- a/llvm/lib/CodeGen/AssignmentTrackingAnalysis.cpp +++ b/llvm/lib/CodeGen/AssignmentTrackingAnalysis.cpp @@ -829,11 +829,7 @@ class MemLocFragmentFill { void process(BasicBlock &BB, VarFragMap &LiveSet) { BBInsertBeforeMap[&BB].clear(); for (auto &I : BB) { - for (DbgRecord &DR : I.getDbgValueRange()) { - // FIXME: DPValue::filter usage needs attention in this file; we need - // to make sure dbg.labels are handled correctly in RemoveDIs mode. - // Cast below to ensure this gets fixed when DPLabels are introduced. - DPValue &DPV = cast<DPValue>(DR); + for (DPValue &DPV : DPValue::filter(I.getDbgValueRange())) { if (const auto *Locs = FnVarLocs->getWedge(&DPV)) { for (const VarLocInfo &Loc : *Locs) { addDef(Loc, &DPV, *I.getParent(), LiveSet); @@ -1919,6 +1915,9 @@ void AssignmentTrackingLowering::process(BasicBlock &BB, BlockInfo *LiveSet) { // attached DPValues, or a non-debug instruction with attached unprocessed // DPValues. if (II != EI && II->hasDbgValues()) { + // Skip over non-variable debug records (i.e., labels). They're going to + // be read from IR (possibly re-ordering them within the debug record + // range) rather than from the analysis results. for (DPValue &DPV : DPValue::filter(II->getDbgValueRange())) { resetInsertionPoint(DPV); processDPValue(DPV, LiveSet); diff --git a/llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp b/llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp index 7c95cef..38bb808 100644 --- a/llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp +++ b/llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp @@ -3275,7 +3275,17 @@ void IRTranslator::translateDbgDeclareRecord(Value *Address, bool HasArgList, void IRTranslator::translateDbgInfo(const Instruction &Inst, MachineIRBuilder &MIRBuilder) { - for (DPValue &DPV : DPValue::filter(Inst.getDbgValueRange())) { + for (DbgRecord &DR : Inst.getDbgValueRange()) { + if (DPLabel *DPL = dyn_cast<DPLabel>(&DR)) { + MIRBuilder.setDebugLoc(DPL->getDebugLoc()); + assert(DPL->getLabel() && "Missing label"); + assert(DPL->getLabel()->isValidLocationForIntrinsic( + MIRBuilder.getDebugLoc()) && + "Expected inlined-at fields to agree"); + MIRBuilder.buildDbgLabel(DPL->getLabel()); + continue; + } + DPValue &DPV = cast<DPValue>(DR); const DILocalVariable *Variable = DPV.getVariable(); const DIExpression *Expression = DPV.getExpression(); Value *V = DPV.getVariableLocationOp(0); diff --git a/llvm/lib/CodeGen/SelectionDAG/FastISel.cpp b/llvm/lib/CodeGen/SelectionDAG/FastISel.cpp index 5651498..246762d 100644 --- a/llvm/lib/CodeGen/SelectionDAG/FastISel.cpp +++ b/llvm/lib/CodeGen/SelectionDAG/FastISel.cpp @@ -1188,11 +1188,24 @@ void FastISel::handleDbgInfo(const Instruction *II) { MIMD = MIMetadata(); // Reverse order of debug records, because fast-isel walks through backwards. - for (DbgRecord &DPR : llvm::reverse(II->getDbgValueRange())) { + for (DbgRecord &DR : llvm::reverse(II->getDbgValueRange())) { flushLocalValueMap(); recomputeInsertPt(); - DPValue &DPV = cast<DPValue>(DPR); + if (DPLabel *DPL = dyn_cast<DPLabel>(&DR)) { + assert(DPL->getLabel() && "Missing label"); + if (!FuncInfo.MF->getMMI().hasDebugInfo()) { + LLVM_DEBUG(dbgs() << "Dropping debug info for " << *DPL << "\n"); + continue; + } + + BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DPL->getDebugLoc(), + TII.get(TargetOpcode::DBG_LABEL)) + .addMetadata(DPL->getLabel()); + continue; + } + + DPValue &DPV = cast<DPValue>(DR); Value *V = nullptr; if (!DPV.hasArgList()) diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp index e893a5b..ee600d3 100644 --- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp +++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp @@ -1241,17 +1241,30 @@ void SelectionDAGBuilder::visitDbgInfo(const Instruction &I) { It->Expr, Vals.size() > 1, It->DL, SDNodeOrder); } } - // We must early-exit here to prevent any DPValues from being emitted below, - // as we have just emitted the debug values resulting from assignment - // tracking analysis, making any existing DPValues redundant (and probably - // less correct). - return; } + // We must skip DPValues if they've already been processed above as we + // have just emitted the debug values resulting from assignment tracking + // analysis, making any existing DPValues redundant (and probably less + // correct). We still need to process DPLabels. This does sink DPLabels + // to the bottom of the group of debug records. That sholdn't be important + // as it does so deterministcally and ordering between DPLabels and DPValues + // is immaterial (other than for MIR/IR printing). + bool SkipDPValues = DAG.getFunctionVarLocs(); // Is there is any debug-info attached to this instruction, in the form of - // DPValue non-instruction debug-info records. - for (DbgRecord &DPR : I.getDbgValueRange()) { - DPValue &DPV = cast<DPValue>(DPR); + // DbgRecord non-instruction debug-info records. + for (DbgRecord &DR : I.getDbgValueRange()) { + if (DPLabel *DPL = dyn_cast<DPLabel>(&DR)) { + assert(DPL->getLabel() && "Missing label"); + SDDbgLabel *SDV = + DAG.getDbgLabel(DPL->getLabel(), DPL->getDebugLoc(), SDNodeOrder); + DAG.AddDbgLabel(SDV); + continue; + } + + if (SkipDPValues) + continue; + DPValue &DPV = cast<DPValue>(DR); DILocalVariable *Variable = DPV.getVariable(); DIExpression *Expression = DPV.getExpression(); dropDanglingDebugInfo(Variable, Expression); diff --git a/llvm/lib/IR/AsmWriter.cpp b/llvm/lib/IR/AsmWriter.cpp index c2a470c..fba404c 100644 --- a/llvm/lib/IR/AsmWriter.cpp +++ b/llvm/lib/IR/AsmWriter.cpp @@ -1141,12 +1141,14 @@ void SlotTracker::processFunctionMetadata(const Function &F) { void SlotTracker::processDbgRecordMetadata(const DbgRecord &DR) { if (const DPValue *DPV = dyn_cast<const DPValue>(&DR)) { CreateMetadataSlot(DPV->getVariable()); - CreateMetadataSlot(DPV->getDebugLoc()); if (DPV->isDbgAssign()) CreateMetadataSlot(DPV->getAssignID()); + } else if (const DPLabel *DPL = dyn_cast<const DPLabel>(&DR)) { + CreateMetadataSlot(DPL->getLabel()); } else { llvm_unreachable("unsupported DbgRecord kind"); } + CreateMetadataSlot(DR.getDebugLoc()); } void SlotTracker::processInstructionMetadata(const Instruction &I) { diff --git a/llvm/lib/Transforms/Scalar/SpeculativeExecution.cpp b/llvm/lib/Transforms/Scalar/SpeculativeExecution.cpp index f4f3070..260f31b 100644 --- a/llvm/lib/Transforms/Scalar/SpeculativeExecution.cpp +++ b/llvm/lib/Transforms/Scalar/SpeculativeExecution.cpp @@ -291,9 +291,9 @@ bool SpeculativeExecutionPass::considerHoistingFromTo( InstructionCost TotalSpeculationCost = 0; unsigned NotHoistedInstCount = 0; for (const auto &I : FromBlock) { - // Make note of any DPValues that need hoisting. - for (DbgRecord &DR : I.getDbgValueRange()) { - DPValue &DPV = cast<DPValue>(DR); + // Make note of any DPValues that need hoisting. DPLabels + // get left behind just like llvm.dbg.labels. + for (DPValue &DPV : DPValue::filter(I.getDbgValueRange())) { if (HasNoUnhoistedInstr(DPV.location_ops())) DPValuesToHoist[DPV.getInstruction()].push_back(&DPV); } diff --git a/llvm/lib/Transforms/Utils/BasicBlockUtils.cpp b/llvm/lib/Transforms/Utils/BasicBlockUtils.cpp index 7fd6759..5bb109a 100644 --- a/llvm/lib/Transforms/Utils/BasicBlockUtils.cpp +++ b/llvm/lib/Transforms/Utils/BasicBlockUtils.cpp @@ -386,7 +386,15 @@ static bool DPValuesRemoveRedundantDbgInstrsUsingBackwardScan(BasicBlock *BB) { SmallVector<DPValue *, 8> ToBeRemoved; SmallDenseSet<DebugVariable> VariableSet; for (auto &I : reverse(*BB)) { - for (DPValue &DPV : reverse(DPValue::filter(I.getDbgValueRange()))) { + for (DbgRecord &DR : reverse(I.getDbgValueRange())) { + if (isa<DPLabel>(DR)) { + // Emulate existing behaviour (see comment below for dbg.declares). + // FIXME: Don't do this. + VariableSet.clear(); + continue; + } + + DPValue &DPV = cast<DPValue>(DR); // Skip declare-type records, as the debug intrinsic method only works // on dbg.value intrinsics. if (DPV.getType() == DPValue::LocationType::Declare) { diff --git a/llvm/lib/Transforms/Utils/CodeExtractor.cpp b/llvm/lib/Transforms/Utils/CodeExtractor.cpp index 8ebcf0c..bab0651 100644 --- a/llvm/lib/Transforms/Utils/CodeExtractor.cpp +++ b/llvm/lib/Transforms/Utils/CodeExtractor.cpp @@ -1585,8 +1585,30 @@ static void fixupDebugInfoPostExtraction(Function &OldFunc, Function &NewFunc, return cast<DILocalVariable>(NewVar); }; - auto UpdateDPValuesOnInst = [&](Instruction &I) -> void { - for (DPValue &DPV : DPValue::filter(I.getDbgValueRange())) { + auto UpdateDbgLabel = [&](auto *LabelRecord) { + // Point the label record to a fresh label within the new function if + // the record was not inlined from some other function. + if (LabelRecord->getDebugLoc().getInlinedAt()) + return; + DILabel *OldLabel = LabelRecord->getLabel(); + DINode *&NewLabel = RemappedMetadata[OldLabel]; + if (!NewLabel) { + DILocalScope *NewScope = DILocalScope::cloneScopeForSubprogram( + *OldLabel->getScope(), *NewSP, Ctx, Cache); + NewLabel = DILabel::get(Ctx, NewScope, OldLabel->getName(), + OldLabel->getFile(), OldLabel->getLine()); + } + LabelRecord->setLabel(cast<DILabel>(NewLabel)); + }; + + auto UpdateDbgRecordsOnInst = [&](Instruction &I) -> void { + for (DbgRecord &DR : I.getDbgValueRange()) { + if (DPLabel *DPL = dyn_cast<DPLabel>(&DR)) { + UpdateDbgLabel(DPL); + continue; + } + + DPValue &DPV = cast<DPValue>(DR); // Apply the two updates that dbg.values get: invalid operands, and // variable metadata fixup. if (any_of(DPV.location_ops(), IsInvalidLocation)) { @@ -1599,13 +1621,11 @@ static void fixupDebugInfoPostExtraction(Function &OldFunc, Function &NewFunc, } if (!DPV.getDebugLoc().getInlinedAt()) DPV.setVariable(GetUpdatedDIVariable(DPV.getVariable())); - DPV.setDebugLoc(DebugLoc::replaceInlinedAtSubprogram(DPV.getDebugLoc(), - *NewSP, Ctx, Cache)); } }; for (Instruction &I : instructions(NewFunc)) { - UpdateDPValuesOnInst(I); + UpdateDbgRecordsOnInst(I); auto *DII = dyn_cast<DbgInfoIntrinsic>(&I); if (!DII) @@ -1614,17 +1634,7 @@ static void fixupDebugInfoPostExtraction(Function &OldFunc, Function &NewFunc, // Point the intrinsic to a fresh label within the new function if the // intrinsic was not inlined from some other function. if (auto *DLI = dyn_cast<DbgLabelInst>(&I)) { - if (DLI->getDebugLoc().getInlinedAt()) - continue; - DILabel *OldLabel = DLI->getLabel(); - DINode *&NewLabel = RemappedMetadata[OldLabel]; - if (!NewLabel) { - DILocalScope *NewScope = DILocalScope::cloneScopeForSubprogram( - *OldLabel->getScope(), *NewSP, Ctx, Cache); - NewLabel = DILabel::get(Ctx, NewScope, OldLabel->getName(), - OldLabel->getFile(), OldLabel->getLine()); - } - DLI->setArgOperand(0, MetadataAsValue::get(Ctx, NewLabel)); + UpdateDbgLabel(DLI); continue; } @@ -1658,6 +1668,9 @@ static void fixupDebugInfoPostExtraction(Function &OldFunc, Function &NewFunc, if (const DebugLoc &DL = I.getDebugLoc()) I.setDebugLoc( DebugLoc::replaceInlinedAtSubprogram(DL, *NewSP, Ctx, Cache)); + for (DbgRecord &DR : I.getDbgValueRange()) + DR.setDebugLoc(DebugLoc::replaceInlinedAtSubprogram(DR.getDebugLoc(), + *NewSP, Ctx, Cache)); // Loop info metadata may contain line locations. Fix them up. auto updateLoopInfoLoc = [&Ctx, &Cache, NewSP](Metadata *MD) -> Metadata * { diff --git a/llvm/lib/Transforms/Utils/MemoryTaggingSupport.cpp b/llvm/lib/Transforms/Utils/MemoryTaggingSupport.cpp index 08fdd3b..2ff7c01 100644 --- a/llvm/lib/Transforms/Utils/MemoryTaggingSupport.cpp +++ b/llvm/lib/Transforms/Utils/MemoryTaggingSupport.cpp @@ -111,8 +111,7 @@ Instruction *getUntagLocationIfFunctionExit(Instruction &Inst) { void StackInfoBuilder::visit(Instruction &Inst) { // Visit non-intrinsic debug-info records attached to Inst. - for (DbgRecord &DR : Inst.getDbgValueRange()) { - DPValue &DPV = cast<DPValue>(DR); + for (DPValue &DPV : DPValue::filter(Inst.getDbgValueRange())) { auto AddIfInteresting = [&](Value *V) { if (auto *AI = dyn_cast_or_null<AllocaInst>(V)) { if (!isInterestingAlloca(*AI)) diff --git a/llvm/lib/Transforms/Utils/ValueMapper.cpp b/llvm/lib/Transforms/Utils/ValueMapper.cpp index 6e46469..91ab279 100644 --- a/llvm/lib/Transforms/Utils/ValueMapper.cpp +++ b/llvm/lib/Transforms/Utils/ValueMapper.cpp @@ -538,6 +538,11 @@ Value *Mapper::mapValue(const Value *V) { } void Mapper::remapDPValue(DbgRecord &DR) { + if (DPLabel *DPL = dyn_cast<DPLabel>(&DR)) { + DPL->setLabel(cast<DILabel>(mapMetadata(DPL->getLabel()))); + return; + } + DPValue &V = cast<DPValue>(DR); // Remap variables and DILocations. auto *MappedVar = mapMetadata(V.getVariable()); diff --git a/llvm/test/Transforms/SpeculativeExecution/PR46267.ll b/llvm/test/Transforms/SpeculativeExecution/PR46267.ll index c27b492..d940ee6 100644 --- a/llvm/test/Transforms/SpeculativeExecution/PR46267.ll +++ b/llvm/test/Transforms/SpeculativeExecution/PR46267.ll @@ -41,12 +41,16 @@ land.rhs: ; preds = %entry ; CHECK-NEXT: call void @llvm.dbg.declare(metadata ptr %y ; CHECK-NEXT: %a0 = load i32, ptr undef, align 1 ; CHECK-NEXT: call void @llvm.dbg.value(metadata i32 %a0 +; CHECK-NEXT: call void @llvm.dbg.label call void @llvm.dbg.label(metadata !11), !dbg !10 %y = alloca i32, align 4 call void @llvm.dbg.declare(metadata ptr %y, metadata !14, metadata !DIExpression()), !dbg !10 %a0 = load i32, ptr undef, align 1 call void @llvm.dbg.value(metadata i32 %a0, metadata !9, metadata !DIExpression()), !dbg !10 + ;; RemoveDIs: Check a label that is attached to a hoisted instruction + ;; gets left behind (match intrinsic-style debug info behaviour). + call void @llvm.dbg.label(metadata !15), !dbg !10 %a2 = add i32 %i, 0 call void @llvm.dbg.value(metadata i32 %a2, metadata !13, metadata !DIExpression()), !dbg !10 @@ -82,3 +86,4 @@ attributes #1 = { nounwind readnone speculatable willreturn } !12 = !DILocalVariable(name: "x", scope: !6, file: !1, line: 3, type: !4) !13 = !DILocalVariable(name: "a2", scope: !6, file: !1, line: 3, type: !4) !14 = !DILocalVariable(name: "y", scope: !6, file: !1, line: 3, type: !4) +!15 = !DILabel(scope: !6, name: "label2", file: !1, line: 2) |