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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: MachineFrameInfo.cpp

//===-- MachineFrameInfo.cpp ---------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
/// \file Implements MachineFrameInfo that manages the stack frame.
//
//===----------------------------------------------------------------------===//

#include "llvm/CodeGen/MachineFrameInfo.h"

#include "llvm/ADT/BitVector.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/CodeGen/TargetFrameLowering.h"
#include "llvm/CodeGen/TargetInstrInfo.h"
#include "llvm/CodeGen/TargetRegisterInfo.h"
#include "llvm/CodeGen/TargetSubtargetInfo.h"
#include "llvm/Config/llvm-config.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/raw_ostream.h"
#include <cassert>

#define DEBUG_TYPE "codegen"

using namespace llvm;

void MachineFrameInfo::ensureMaxAlignment(Align Alignment) {
  if (!StackRealignable)
    assert(Alignment <= StackAlignment &&
           "For targets without stack realignment, Alignment is out of limit!");
  if (MaxAlignment < Alignment)
    MaxAlignment = Alignment;
}

/// Clamp the alignment if requested and emit a warning.
static inline Align clampStackAlignment(bool ShouldClamp, Align Alignment,
                                        Align StackAlignment) {
  if (!ShouldClamp || Alignment <= StackAlignment)
    return Alignment;
  LLVM_DEBUG(dbgs() << "Warning: requested alignment " << DebugStr(Alignment)
                    << " exceeds the stack alignment "
                    << DebugStr(StackAlignment)
                    << " when stack realignment is off" << '\n');
  return StackAlignment;
}

int MachineFrameInfo::CreateStackObject(uint64_t Size, Align Alignment,
                                        bool IsSpillSlot,
                                        const AllocaInst *Alloca,
                                        uint8_t StackID) {
  assert(Size != 0 && "Cannot allocate zero size stack objects!");
  Alignment = clampStackAlignment(!StackRealignable, Alignment, StackAlignment);
  Objects.push_back(StackObject(Size, Alignment, 0, false, IsSpillSlot, Alloca,
                                !IsSpillSlot, StackID));
  int Index = (int)Objects.size() - NumFixedObjects - 1;
  assert(Index >= 0 && "Bad frame index!");
  if (StackID == 0)
    ensureMaxAlignment(Alignment);
  return Index;
}

int MachineFrameInfo::CreateSpillStackObject(uint64_t Size, Align Alignment) {
  Alignment = clampStackAlignment(!StackRealignable, Alignment, StackAlignment);
  CreateStackObject(Size, Alignment, true);
  int Index = (int)Objects.size() - NumFixedObjects - 1;
  ensureMaxAlignment(Alignment);
  return Index;
}

int MachineFrameInfo::CreateVariableSizedObject(Align Alignment,
                                                const AllocaInst *Alloca) {
  HasVarSizedObjects = true;
  Alignment = clampStackAlignment(!StackRealignable, Alignment, StackAlignment);
  Objects.push_back(StackObject(0, Alignment, 0, false, false, Alloca, true));
  ensureMaxAlignment(Alignment);
  return (int)Objects.size()-NumFixedObjects-1;
}

int MachineFrameInfo::CreateFixedObject(uint64_t Size, int64_t SPOffset,
                                        bool IsImmutable, bool IsAliased) {
  assert(Size != 0 && "Cannot allocate zero size fixed stack objects!");
  // The alignment of the frame index can be determined from its offset from
  // the incoming frame position.  If the frame object is at offset 32 and
  // the stack is guaranteed to be 16-byte aligned, then we know that the
  // object is 16-byte aligned. Note that unlike the non-fixed case, if the
  // stack needs realignment, we can't assume that the stack will in fact be
  // aligned.
  Align Alignment =
      commonAlignment(ForcedRealign ? Align(1) : StackAlignment, SPOffset);
  Alignment = clampStackAlignment(!StackRealignable, Alignment, StackAlignment);
  Objects.insert(Objects.begin(),
                 StackObject(Size, Alignment, SPOffset, IsImmutable,
                             /*IsSpillSlot=*/false, /*Alloca=*/nullptr,
                             IsAliased));
  return -++NumFixedObjects;
}

int MachineFrameInfo::CreateFixedSpillStackObject(uint64_t Size,
                                                  int64_t SPOffset,
                                                  bool IsImmutable) {
  Align Alignment =
      commonAlignment(ForcedRealign ? Align(1) : StackAlignment, SPOffset);
  Alignment = clampStackAlignment(!StackRealignable, Alignment, StackAlignment);
  Objects.insert(Objects.begin(),
                 StackObject(Size, Alignment, SPOffset, IsImmutable,
                             /*IsSpillSlot=*/true, /*Alloca=*/nullptr,
                             /*IsAliased=*/false));
  return -++NumFixedObjects;
}

BitVector MachineFrameInfo::getPristineRegs(const MachineFunction &MF) const {
  const TargetRegisterInfo *TRI = MF.getSubtarget().getRegisterInfo();
  BitVector BV(TRI->getNumRegs());

// Before CSI is calculated, no registers are considered pristine. They can be
  // freely used and PEI will make sure they are saved.
  if (!isCalleeSavedInfoValid())
    return BV;

const MachineRegisterInfo &MRI = MF.getRegInfo();
  for (const MCPhysReg *CSR = MRI.getCalleeSavedRegs(); CSR && *CSR;
       ++CSR)
    BV.set(*CSR);

// Saved CSRs are not pristine.
  for (auto &I : getCalleeSavedInfo())
    for (MCSubRegIterator S(I.getReg(), TRI, true); S.isValid(); ++S)
      BV.reset(*S);

return BV;
}

uint64_t MachineFrameInfo::estimateStackSize(const MachineFunction &MF) const {
  const TargetFrameLowering *TFI = MF.getSubtarget().getFrameLowering();
  const TargetRegisterInfo *RegInfo = MF.getSubtarget().getRegisterInfo();
  Align MaxAlign = getMaxAlign();
  int64_t Offset = 0;

// This code is very, very similar to PEI::calculateFrameObjectOffsets().
  // It really should be refactored to share code. Until then, changes
  // should keep in mind that there's tight coupling between the two.

for (int i = getObjectIndexBegin(); i != 0; ++i) {
    // Only estimate stack size of default stack.
    if (getStackID(i) != TargetStackID::Default)
      continue;
    int64_t FixedOff = -getObjectOffset(i);
    if (FixedOff > Offset) Offset = FixedOff;
  }
  for (unsigned i = 0, e = getObjectIndexEnd(); i != e; ++i) {
    // Only estimate stack size of live objects on default stack.
    if (isDeadObjectIndex(i) || getStackID(i) != TargetStackID::Default)
      continue;
    Offset += getObjectSize(i);
    Align Alignment = getObjectAlign(i);
    // Adjust to alignment boundary
    Offset = alignTo(Offset, Alignment);

MaxAlign = std::max(Alignment, MaxAlign);
  }

if (adjustsStack() && TFI->hasReservedCallFrame(MF))
    Offset += getMaxCallFrameSize();

// Round up the size to a multiple of the alignment.  If the function has
  // any calls or alloca's, align to the target's StackAlignment value to
  // ensure that the callee's frame or the alloca data is suitably aligned;
  // otherwise, for leaf functions, align to the TransientStackAlignment
  // value.
  Align StackAlign;
  if (adjustsStack() || hasVarSizedObjects() ||
      (RegInfo->needsStackRealignment(MF) && getObjectIndexEnd() != 0))
    StackAlign = TFI->getStackAlign();
  else
    StackAlign = TFI->getTransientStackAlign();

// If the frame pointer is eliminated, all frame offsets will be relative to
  // SP not FP. Align to MaxAlign so this works.
  StackAlign = std::max(StackAlign, MaxAlign);
  return alignTo(Offset, StackAlign);
}

void MachineFrameInfo::computeMaxCallFrameSize(const MachineFunction &MF) {
  const TargetInstrInfo &TII = *MF.getSubtarget().getInstrInfo();
  unsigned FrameSetupOpcode = TII.getCallFrameSetupOpcode();
  unsigned FrameDestroyOpcode = TII.getCallFrameDestroyOpcode();
  assert(FrameSetupOpcode != ~0u && FrameDestroyOpcode != ~0u &&
         "Can only compute MaxCallFrameSize if Setup/Destroy opcode are known");

MaxCallFrameSize = 0;
  for (const MachineBasicBlock &MBB : MF) {
    for (const MachineInstr &MI : MBB) {
      unsigned Opcode = MI.getOpcode();
      if (Opcode == FrameSetupOpcode || Opcode == FrameDestroyOpcode) {
        unsigned Size = TII.getFrameSize(MI);
        MaxCallFrameSize = std::max(MaxCallFrameSize, Size);
        AdjustsStack = true;
      } else if (MI.isInlineAsm()) {
        // Some inline asm's need a stack frame, as indicated by operand 1.
        unsigned ExtraInfo = MI.getOperand(InlineAsm::MIOp_ExtraInfo).getImm();
        if (ExtraInfo & InlineAsm::Extra_IsAlignStack)
          AdjustsStack = true;
      }
    }
  }
}

void MachineFrameInfo::print(const MachineFunction &MF, raw_ostream &OS) const{
  if (Objects.empty()) return;

const TargetFrameLowering *FI = MF.getSubtarget().getFrameLowering();
  int ValOffset = (FI ? FI->getOffsetOfLocalArea() : 0);

OS << "Frame Objects:\n";

for (unsigned i = 0, e = Objects.size(); i != e; ++i) {
    const StackObject &SO = Objects[i];
    OS << "  fi#" << (int)(i-NumFixedObjects) << ": ";

if (SO.StackID != 0)
      OS << "id=" << static_cast<unsigned>(SO.StackID) << ' ';

if (SO.Size == ~0ULL) {
      OS << "dead\n";
      continue;
    }
    if (SO.Size == 0)
      OS << "variable sized";
    else
      OS << "size=" << SO.Size;
    OS << ", align=" << SO.Alignment.value();

if (i < NumFixedObjects)
      OS << ", fixed";
    if (i < NumFixedObjects || SO.SPOffset != -1) {
      int64_t Off = SO.SPOffset - ValOffset;
      OS << ", at location [SP";
      if (Off > 0)
        OS << "+" << Off;
      else if (Off < 0)
        OS << Off;
      OS << "]";
    }
    OS << "\n";
  }
}

#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
LLVM_DUMP_METHOD void MachineFrameInfo::dump(const MachineFunction &MF) const {
  print(MF, dbgs());
}
#endif

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