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📄 AggressiveAntiDepBreaker.cpp(37.23 KB)
📄 AggressiveAntiDepBreaker.h(6.8 KB)
📄 AllocationOrder.cpp(1.96 KB)
📄 AllocationOrder.h(2.96 KB)
📄 Analysis.cpp(32.62 KB)
📁 AsmPrinter
📄 AtomicExpandPass.cpp(71.86 KB)
📄 BBSectionsPrepare.cpp(18.8 KB)
📄 BasicTargetTransformInfo.cpp(1.53 KB)
📄 BranchFolding.cpp(77.92 KB)
📄 BranchFolding.h(7.36 KB)
📄 BranchRelaxation.cpp(19.45 KB)
📄 BreakFalseDeps.cpp(9.79 KB)
📄 BuiltinGCs.cpp(4.88 KB)
📄 CFGuardLongjmp.cpp(3.73 KB)
📄 CFIInstrInserter.cpp(17.53 KB)
📄 CalcSpillWeights.cpp(10.22 KB)
📄 CallingConvLower.cpp(10.4 KB)
📄 CodeGen.cpp(5.28 KB)
📄 CodeGenPrepare.cpp(295.01 KB)
📄 CommandFlags.cpp(24.89 KB)
📄 CriticalAntiDepBreaker.cpp(27.91 KB)
📄 CriticalAntiDepBreaker.h(4.22 KB)
📄 DFAPacketizer.cpp(10.91 KB)
📄 DeadMachineInstructionElim.cpp(6.52 KB)
📄 DetectDeadLanes.cpp(20.74 KB)
📄 DwarfEHPrepare.cpp(9.01 KB)
📄 EarlyIfConversion.cpp(37.51 KB)
📄 EdgeBundles.cpp(3.21 KB)
📄 ExecutionDomainFix.cpp(14.67 KB)
📄 ExpandMemCmp.cpp(33.66 KB)
📄 ExpandPostRAPseudos.cpp(7.28 KB)
📄 ExpandReductions.cpp(7.23 KB)
📄 FEntryInserter.cpp(1.81 KB)
📄 FaultMaps.cpp(4.99 KB)
📄 FinalizeISel.cpp(2.65 KB)
📄 FixupStatepointCallerSaved.cpp(11.06 KB)
📄 FuncletLayout.cpp(2.21 KB)
📄 GCMetadata.cpp(5.1 KB)
📄 GCMetadataPrinter.cpp(748 B)
📄 GCRootLowering.cpp(11.46 KB)
📄 GCStrategy.cpp(708 B)
📁 GlobalISel
📄 GlobalMerge.cpp(24.52 KB)
📄 HardwareLoops.cpp(18.44 KB)
📄 IfConversion.cpp(89.43 KB)
📄 ImplicitNullChecks.cpp(25.14 KB)
📄 IndirectBrExpandPass.cpp(7.79 KB)
📄 InlineSpiller.cpp(58.24 KB)
📄 InterferenceCache.cpp(8.83 KB)
📄 InterferenceCache.h(7.22 KB)
📄 InterleavedAccessPass.cpp(16.59 KB)
📄 InterleavedLoadCombinePass.cpp(42.35 KB)
📄 IntrinsicLowering.cpp(17.08 KB)
📄 LLVMTargetMachine.cpp(10.25 KB)
📄 LatencyPriorityQueue.cpp(5.64 KB)
📄 LazyMachineBlockFrequencyInfo.cpp(3.36 KB)
📄 LexicalScopes.cpp(12.16 KB)
📄 LiveDebugValues.cpp(78.98 KB)
📄 LiveDebugVariables.cpp(51.79 KB)
📄 LiveDebugVariables.h(2.15 KB)
📄 LiveInterval.cpp(46.67 KB)
📄 LiveIntervalCalc.cpp(7.62 KB)
📄 LiveIntervalUnion.cpp(6.36 KB)
📄 LiveIntervals.cpp(64.59 KB)
📄 LivePhysRegs.cpp(11.08 KB)
📄 LiveRangeCalc.cpp(15.72 KB)
📄 LiveRangeEdit.cpp(17.03 KB)
📄 LiveRangeShrink.cpp(8.69 KB)
📄 LiveRangeUtils.h(2.12 KB)
📄 LiveRegMatrix.cpp(7.47 KB)
📄 LiveRegUnits.cpp(4.72 KB)
📄 LiveStacks.cpp(2.95 KB)
📄 LiveVariables.cpp(30.26 KB)
📄 LocalStackSlotAllocation.cpp(17.26 KB)
📄 LoopTraversal.cpp(2.89 KB)
📄 LowLevelType.cpp(1.93 KB)
📄 LowerEmuTLS.cpp(5.66 KB)
📄 MBFIWrapper.cpp(1.57 KB)
📄 MIRCanonicalizerPass.cpp(12.46 KB)
📄 MIRNamerPass.cpp(2.16 KB)
📁 MIRParser
📄 MIRPrinter.cpp(32.67 KB)
📄 MIRPrintingPass.cpp(1.99 KB)
📄 MIRVRegNamerUtils.cpp(6.04 KB)
📄 MIRVRegNamerUtils.h(3.25 KB)
📄 MachineBasicBlock.cpp(50.47 KB)
📄 MachineBlockFrequencyInfo.cpp(10.13 KB)
📄 MachineBlockPlacement.cpp(137.61 KB)
📄 MachineBranchProbabilityInfo.cpp(3.5 KB)
📄 MachineCSE.cpp(31.82 KB)
📄 MachineCombiner.cpp(28.13 KB)
📄 MachineCopyPropagation.cpp(29.21 KB)
📄 MachineDebugify.cpp(6.47 KB)
📄 MachineDominanceFrontier.cpp(1.83 KB)
📄 MachineDominators.cpp(4.86 KB)
📄 MachineFrameInfo.cpp(9.77 KB)
📄 MachineFunction.cpp(42.97 KB)
📄 MachineFunctionPass.cpp(4.78 KB)
📄 MachineFunctionPrinterPass.cpp(2.3 KB)
📄 MachineInstr.cpp(76.39 KB)
📄 MachineInstrBundle.cpp(11.49 KB)
📄 MachineLICM.cpp(57.05 KB)
📄 MachineLoopInfo.cpp(4.98 KB)
📄 MachineLoopUtils.cpp(5.16 KB)
📄 MachineModuleInfo.cpp(9.9 KB)
📄 MachineModuleInfoImpls.cpp(1.5 KB)
📄 MachineOperand.cpp(39.6 KB)
📄 MachineOptimizationRemarkEmitter.cpp(3.29 KB)
📄 MachineOutliner.cpp(42.13 KB)
📄 MachinePipeliner.cpp(111.33 KB)
📄 MachinePostDominators.cpp(2.42 KB)
📄 MachineRegionInfo.cpp(4.75 KB)
📄 MachineRegisterInfo.cpp(22.97 KB)
📄 MachineSSAUpdater.cpp(12.99 KB)
📄 MachineScheduler.cpp(136.89 KB)
📄 MachineSink.cpp(51.94 KB)
📄 MachineSizeOpts.cpp(8.76 KB)
📄 MachineStripDebug.cpp(3.76 KB)
📄 MachineTraceMetrics.cpp(49.58 KB)
📄 MachineVerifier.cpp(107.98 KB)
📄 MacroFusion.cpp(7.55 KB)
📄 ModuloSchedule.cpp(85.09 KB)
📄 NonRelocatableStringpool.cpp(1.65 KB)
📄 OptimizePHIs.cpp(6.7 KB)
📄 PHIElimination.cpp(27.73 KB)
📄 PHIEliminationUtils.cpp(2.56 KB)
📄 PHIEliminationUtils.h(972 B)
📄 ParallelCG.cpp(3.71 KB)
📄 PatchableFunction.cpp(3.44 KB)
📄 PeepholeOptimizer.cpp(78.41 KB)
📄 PostRAHazardRecognizer.cpp(3.5 KB)
📄 PostRASchedulerList.cpp(24.31 KB)
📄 PreISelIntrinsicLowering.cpp(7.91 KB)
📄 ProcessImplicitDefs.cpp(5.4 KB)
📄 PrologEpilogInserter.cpp(50.45 KB)
📄 PseudoSourceValue.cpp(4.71 KB)
📄 RDFGraph.cpp(58.39 KB)
📄 RDFLiveness.cpp(40.7 KB)
📄 RDFRegisters.cpp(11.29 KB)
📄 ReachingDefAnalysis.cpp(21.74 KB)
📄 RegAllocBase.cpp(6.31 KB)
📄 RegAllocBase.h(4.63 KB)
📄 RegAllocBasic.cpp(11.33 KB)
📄 RegAllocFast.cpp(45.78 KB)
📄 RegAllocGreedy.cpp(123.32 KB)
📄 RegAllocPBQP.cpp(33.14 KB)
📄 RegUsageInfoCollector.cpp(7.39 KB)
📄 RegUsageInfoPropagate.cpp(5.07 KB)
📄 RegisterClassInfo.cpp(6.62 KB)
📄 RegisterCoalescer.cpp(151.71 KB)
📄 RegisterCoalescer.h(4.04 KB)
📄 RegisterPressure.cpp(48.86 KB)
📄 RegisterScavenging.cpp(27.48 KB)
📄 RegisterUsageInfo.cpp(3.18 KB)
📄 RenameIndependentSubregs.cpp(14.79 KB)
📄 ResetMachineFunctionPass.cpp(3.48 KB)
📄 SafeStack.cpp(34.12 KB)
📄 SafeStackLayout.cpp(5.3 KB)
📄 SafeStackLayout.h(2.41 KB)
📄 ScalarizeMaskedMemIntrin.cpp(31.46 KB)
📄 ScheduleDAG.cpp(21.34 KB)
📄 ScheduleDAGInstrs.cpp(54.59 KB)
📄 ScheduleDAGPrinter.cpp(3.21 KB)
📄 ScoreboardHazardRecognizer.cpp(7.96 KB)
📁 SelectionDAG
📄 ShadowStackGCLowering.cpp(14.16 KB)
📄 ShrinkWrap.cpp(23.03 KB)
📄 SjLjEHPrepare.cpp(18.93 KB)
📄 SlotIndexes.cpp(9.35 KB)
📄 SpillPlacement.cpp(12.58 KB)
📄 SpillPlacement.h(6.67 KB)
📄 SplitKit.cpp(66.39 KB)
📄 SplitKit.h(23.7 KB)
📄 StackColoring.cpp(49.03 KB)
📄 StackMapLivenessAnalysis.cpp(6.16 KB)
📄 StackMaps.cpp(19.74 KB)
📄 StackProtector.cpp(22.94 KB)
📄 StackSlotColoring.cpp(17.12 KB)
📄 SwiftErrorValueTracking.cpp(11.37 KB)
📄 SwitchLoweringUtils.cpp(18.33 KB)
📄 TailDuplication.cpp(3.32 KB)
📄 TailDuplicator.cpp(38.29 KB)
📄 TargetFrameLoweringImpl.cpp(6.24 KB)
📄 TargetInstrInfo.cpp(51.1 KB)
📄 TargetLoweringBase.cpp(82.53 KB)
📄 TargetLoweringObjectFileImpl.cpp(80.52 KB)
📄 TargetOptionsImpl.cpp(2 KB)
📄 TargetPassConfig.cpp(48.89 KB)
📄 TargetRegisterInfo.cpp(19.15 KB)
📄 TargetSchedule.cpp(13.16 KB)
📄 TargetSubtargetInfo.cpp(1.89 KB)
📄 TwoAddressInstructionPass.cpp(62.08 KB)
📄 TypePromotion.cpp(32.46 KB)
📄 UnreachableBlockElim.cpp(7.48 KB)
📄 ValueTypes.cpp(19.87 KB)
📄 VirtRegMap.cpp(21.4 KB)
📄 WasmEHPrepare.cpp(17.48 KB)
📄 WinEHPrepare.cpp(51.16 KB)
📄 XRayInstrumentation.cpp(9.66 KB)

Editing: GCRootLowering.cpp

//===-- GCRootLowering.cpp - Garbage collection infrastructure ------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file implements the lowering for the gc.root mechanism.
//
//===----------------------------------------------------------------------===//

#include "llvm/CodeGen/GCMetadata.h"
#include "llvm/CodeGen/GCStrategy.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineModuleInfo.h"
#include "llvm/CodeGen/Passes.h"
#include "llvm/CodeGen/TargetFrameLowering.h"
#include "llvm/CodeGen/TargetInstrInfo.h"
#include "llvm/CodeGen/TargetRegisterInfo.h"
#include "llvm/CodeGen/TargetSubtargetInfo.h"
#include "llvm/IR/Dominators.h"
#include "llvm/IR/IntrinsicInst.h"
#include "llvm/IR/Module.h"
#include "llvm/InitializePasses.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/raw_ostream.h"

using namespace llvm;

namespace {

/// LowerIntrinsics - This pass rewrites calls to the llvm.gcread or
/// llvm.gcwrite intrinsics, replacing them with simple loads and stores as
/// directed by the GCStrategy. It also performs automatic root initialization
/// and custom intrinsic lowering.
class LowerIntrinsics : public FunctionPass {
  bool DoLowering(Function &F, GCStrategy &S);

public:
  static char ID;

LowerIntrinsics();
  StringRef getPassName() const override;
  void getAnalysisUsage(AnalysisUsage &AU) const override;

bool doInitialization(Module &M) override;
  bool runOnFunction(Function &F) override;
};

/// GCMachineCodeAnalysis - This is a target-independent pass over the machine
/// function representation to identify safe points for the garbage collector
/// in the machine code. It inserts labels at safe points and populates a
/// GCMetadata record for each function.
class GCMachineCodeAnalysis : public MachineFunctionPass {
  GCFunctionInfo *FI;
  const TargetInstrInfo *TII;

void FindSafePoints(MachineFunction &MF);
  void VisitCallPoint(MachineBasicBlock::iterator CI);
  MCSymbol *InsertLabel(MachineBasicBlock &MBB, MachineBasicBlock::iterator MI,
                        const DebugLoc &DL) const;

void FindStackOffsets(MachineFunction &MF);

public:
  static char ID;

GCMachineCodeAnalysis();
  void getAnalysisUsage(AnalysisUsage &AU) const override;

bool runOnMachineFunction(MachineFunction &MF) override;
};
}

// -----------------------------------------------------------------------------

INITIALIZE_PASS_BEGIN(LowerIntrinsics, "gc-lowering", "GC Lowering", false,
                      false)
INITIALIZE_PASS_DEPENDENCY(GCModuleInfo)
INITIALIZE_PASS_END(LowerIntrinsics, "gc-lowering", "GC Lowering", false, false)

FunctionPass *llvm::createGCLoweringPass() { return new LowerIntrinsics(); }

char LowerIntrinsics::ID = 0;

LowerIntrinsics::LowerIntrinsics() : FunctionPass(ID) {
  initializeLowerIntrinsicsPass(*PassRegistry::getPassRegistry());
}

StringRef LowerIntrinsics::getPassName() const {
  return "Lower Garbage Collection Instructions";
}

void LowerIntrinsics::getAnalysisUsage(AnalysisUsage &AU) const {
  FunctionPass::getAnalysisUsage(AU);
  AU.addRequired<GCModuleInfo>();
  AU.addPreserved<DominatorTreeWrapperPass>();
}

/// doInitialization - If this module uses the GC intrinsics, find them now.
bool LowerIntrinsics::doInitialization(Module &M) {
  GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
  assert(MI && "LowerIntrinsics didn't require GCModuleInfo!?");
  for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I)
    if (!I->isDeclaration() && I->hasGC())
      MI->getFunctionInfo(*I); // Instantiate the GC strategy.

return false;
}

/// CouldBecomeSafePoint - Predicate to conservatively determine whether the
/// instruction could introduce a safe point.
static bool CouldBecomeSafePoint(Instruction *I) {
  // The natural definition of instructions which could introduce safe points
  // are:
  //
  //   - call, invoke (AfterCall, BeforeCall)
  //   - phis (Loops)
  //   - invoke, ret, unwind (Exit)
  //
  // However, instructions as seemingly inoccuous as arithmetic can become
  // libcalls upon lowering (e.g., div i64 on a 32-bit platform), so instead
  // it is necessary to take a conservative approach.

if (isa<AllocaInst>(I) || isa<GetElementPtrInst>(I) || isa<StoreInst>(I) ||
      isa<LoadInst>(I))
    return false;

// llvm.gcroot is safe because it doesn't do anything at runtime.
  if (CallInst *CI = dyn_cast<CallInst>(I))
    if (Function *F = CI->getCalledFunction())
      if (Intrinsic::ID IID = F->getIntrinsicID())
        if (IID == Intrinsic::gcroot)
          return false;

return true;
}

static bool InsertRootInitializers(Function &F, ArrayRef<AllocaInst *> Roots) {
  // Scroll past alloca instructions.
  BasicBlock::iterator IP = F.getEntryBlock().begin();
  while (isa<AllocaInst>(IP))
    ++IP;

// Search for initializers in the initial BB.
  SmallPtrSet<AllocaInst *, 16> InitedRoots;
  for (; !CouldBecomeSafePoint(&*IP); ++IP)
    if (StoreInst *SI = dyn_cast<StoreInst>(IP))
      if (AllocaInst *AI =
              dyn_cast<AllocaInst>(SI->getOperand(1)->stripPointerCasts()))
        InitedRoots.insert(AI);

// Add root initializers.
  bool MadeChange = false;

for (AllocaInst *Root : Roots)
    if (!InitedRoots.count(Root)) {
      new StoreInst(
          ConstantPointerNull::get(cast<PointerType>(Root->getAllocatedType())),
          Root, Root->getNextNode());
      MadeChange = true;
    }

return MadeChange;
}

/// runOnFunction - Replace gcread/gcwrite intrinsics with loads and stores.
/// Leave gcroot intrinsics; the code generator needs to see those.
bool LowerIntrinsics::runOnFunction(Function &F) {
  // Quick exit for functions that do not use GC.
  if (!F.hasGC())
    return false;

GCFunctionInfo &FI = getAnalysis<GCModuleInfo>().getFunctionInfo(F);
  GCStrategy &S = FI.getStrategy();

return DoLowering(F, S);
}

/// Lower barriers out of existance (if the associated GCStrategy hasn't
/// already done so...), and insert initializing stores to roots as a defensive
/// measure.  Given we're going to report all roots live at all safepoints, we
/// need to be able to ensure each root has been initialized by the point the
/// first safepoint is reached.  This really should have been done by the
/// frontend, but the old API made this non-obvious, so we do a potentially
/// redundant store just in case.
bool LowerIntrinsics::DoLowering(Function &F, GCStrategy &S) {
  SmallVector<AllocaInst *, 32> Roots;

bool MadeChange = false;
  for (BasicBlock &BB : F)
    for (BasicBlock::iterator II = BB.begin(), E = BB.end(); II != E;) {
      IntrinsicInst *CI = dyn_cast<IntrinsicInst>(II++);
      if (!CI)
        continue;

Function *F = CI->getCalledFunction();
      switch (F->getIntrinsicID()) {
      default: break;
      case Intrinsic::gcwrite: {
        // Replace a write barrier with a simple store.
        Value *St = new StoreInst(CI->getArgOperand(0),
                                  CI->getArgOperand(2), CI);
        CI->replaceAllUsesWith(St);
        CI->eraseFromParent();
        MadeChange = true;
        break;
      }
      case Intrinsic::gcread: {
        // Replace a read barrier with a simple load.
        Value *Ld = new LoadInst(CI->getType(), CI->getArgOperand(1), "", CI);
        Ld->takeName(CI);
        CI->replaceAllUsesWith(Ld);
        CI->eraseFromParent();
        MadeChange = true;
        break;
      }
      case Intrinsic::gcroot: {
        // Initialize the GC root, but do not delete the intrinsic. The
        // backend needs the intrinsic to flag the stack slot.
        Roots.push_back(
            cast<AllocaInst>(CI->getArgOperand(0)->stripPointerCasts()));
        break;
      }
      }
    }

if (Roots.size())
    MadeChange |= InsertRootInitializers(F, Roots);

return MadeChange;
}

// -----------------------------------------------------------------------------

char GCMachineCodeAnalysis::ID = 0;
char &llvm::GCMachineCodeAnalysisID = GCMachineCodeAnalysis::ID;

INITIALIZE_PASS(GCMachineCodeAnalysis, "gc-analysis",
                "Analyze Machine Code For Garbage Collection", false, false)

GCMachineCodeAnalysis::GCMachineCodeAnalysis() : MachineFunctionPass(ID) {}

void GCMachineCodeAnalysis::getAnalysisUsage(AnalysisUsage &AU) const {
  MachineFunctionPass::getAnalysisUsage(AU);
  AU.setPreservesAll();
  AU.addRequired<GCModuleInfo>();
}

MCSymbol *GCMachineCodeAnalysis::InsertLabel(MachineBasicBlock &MBB,
                                             MachineBasicBlock::iterator MI,
                                             const DebugLoc &DL) const {
  MCSymbol *Label = MBB.getParent()->getContext().createTempSymbol();
  BuildMI(MBB, MI, DL, TII->get(TargetOpcode::GC_LABEL)).addSym(Label);
  return Label;
}

void GCMachineCodeAnalysis::VisitCallPoint(MachineBasicBlock::iterator CI) {
  // Find the return address (next instruction), since that's what will be on
  // the stack when the call is suspended and we need to inspect the stack.
  MachineBasicBlock::iterator RAI = CI;
  ++RAI;

MCSymbol *Label = InsertLabel(*CI->getParent(), RAI, CI->getDebugLoc());
  FI->addSafePoint(Label, CI->getDebugLoc());
}

void GCMachineCodeAnalysis::FindSafePoints(MachineFunction &MF) {
  for (MachineBasicBlock &MBB : MF)
    for (MachineBasicBlock::iterator MI = MBB.begin(), ME = MBB.end();
         MI != ME; ++MI)
      if (MI->isCall()) {
        // Do not treat tail or sibling call sites as safe points.  This is
        // legal since any arguments passed to the callee which live in the
        // remnants of the callers frame will be owned and updated by the
        // callee if required.
        if (MI->isTerminator())
          continue;
        VisitCallPoint(MI);
      }
}

void GCMachineCodeAnalysis::FindStackOffsets(MachineFunction &MF) {
  const TargetFrameLowering *TFI = MF.getSubtarget().getFrameLowering();
  assert(TFI && "TargetRegisterInfo not available!");

for (GCFunctionInfo::roots_iterator RI = FI->roots_begin();
       RI != FI->roots_end();) {
    // If the root references a dead object, no need to keep it.
    if (MF.getFrameInfo().isDeadObjectIndex(RI->Num)) {
      RI = FI->removeStackRoot(RI);
    } else {
      Register FrameReg; // FIXME: surely GCRoot ought to store the
                         // register that the offset is from?
      RI->StackOffset = TFI->getFrameIndexReference(MF, RI->Num, FrameReg);
      ++RI;
    }
  }
}

bool GCMachineCodeAnalysis::runOnMachineFunction(MachineFunction &MF) {
  // Quick exit for functions that do not use GC.
  if (!MF.getFunction().hasGC())
    return false;

FI = &getAnalysis<GCModuleInfo>().getFunctionInfo(MF.getFunction());
  TII = MF.getSubtarget().getInstrInfo();

// Find the size of the stack frame.  There may be no correct static frame
  // size, we use UINT64_MAX to represent this.
  const MachineFrameInfo &MFI = MF.getFrameInfo();
  const TargetRegisterInfo *RegInfo = MF.getSubtarget().getRegisterInfo();
  const bool DynamicFrameSize = MFI.hasVarSizedObjects() ||
    RegInfo->needsStackRealignment(MF);
  FI->setFrameSize(DynamicFrameSize ? UINT64_MAX : MFI.getStackSize());

// Find all safe points.
  if (FI->getStrategy().needsSafePoints())
    FindSafePoints(MF);

// Find the concrete stack offsets for all roots (stack slots)
  FindStackOffsets(MF);

return false;
}

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Editing: GCRootLowering.cpp

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