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📄 AccelTable.h(13.54 KB)
📄 Analysis.h(6.04 KB)
📄 AntiDepBreaker.h(3.78 KB)
📄 AsmPrinter.h(27.35 KB)
📄 AsmPrinterHandler.h(2.6 KB)
📄 AtomicExpandUtils.h(2.49 KB)
📄 BasicTTIImpl.h(73.64 KB)
📄 BuiltinGCs.h(1008 B)
📄 CSEConfigBase.h(1.09 KB)
📄 CalcSpillWeights.h(4.69 KB)
📄 CallingConvLower.h(21 KB)
📄 CommandFlags.h(3.65 KB)
📄 CostTable.h(1.87 KB)
📄 DAGCombine.h(606 B)
📄 DFAPacketizer.h(7.47 KB)
📄 DIE.h(32.19 KB)
📄 DIEValue.def(1.4 KB)
📄 DbgEntityHistoryCalculator.h(4.37 KB)
📄 DebugHandlerBase.h(4.68 KB)
📄 DwarfStringPoolEntry.h(2.18 KB)
📄 EdgeBundles.h(2.13 KB)
📄 ExecutionDomainFix.h(7.72 KB)
📄 ExpandReductions.h(726 B)
📄 FastISel.h(22.87 KB)
📄 FaultMaps.h(6.66 KB)
📄 FunctionLoweringInfo.h(9.68 KB)
📄 GCMetadata.h(7.24 KB)
📄 GCMetadataPrinter.h(2.46 KB)
📄 GCStrategy.h(5.25 KB)
📁 GlobalISel
📄 ISDOpcodes.h(52.75 KB)
📄 IndirectThunks.h(3.85 KB)
📄 IntrinsicLowering.h(1.67 KB)
📄 LatencyPriorityQueue.h(3.09 KB)
📄 LazyMachineBlockFrequencyInfo.h(2.82 KB)
📄 LexicalScopes.h(10.06 KB)
📄 LinkAllAsmWriterComponents.h(1.34 KB)
📄 LinkAllCodegenComponents.h(2.18 KB)
📄 LiveInterval.h(37.24 KB)
📄 LiveIntervalCalc.h(2.91 KB)
📄 LiveIntervalUnion.h(6.93 KB)
📄 LiveIntervals.h(19.86 KB)
📄 LivePhysRegs.h(7.51 KB)
📄 LiveRangeCalc.h(11.49 KB)
📄 LiveRangeEdit.h(10.45 KB)
📄 LiveRegMatrix.h(6.18 KB)
📄 LiveRegUnits.h(6.24 KB)
📄 LiveStacks.h(3.35 KB)
📄 LiveVariables.h(12.98 KB)
📄 LoopTraversal.h(4.38 KB)
📄 LowLevelType.h(1.28 KB)
📄 MBFIWrapper.h(1.58 KB)
📄 MIRFormatter.h(3.13 KB)
📁 MIRParser
📄 MIRPrinter.h(1.73 KB)
📄 MIRYamlMapping.h(23.95 KB)
📄 MachORelocation.h(2.19 KB)
📄 MachineBasicBlock.h(42.95 KB)
📄 MachineBlockFrequencyInfo.h(3.21 KB)
📄 MachineBranchProbabilityInfo.h(2.69 KB)
📄 MachineCombinerPattern.h(3.5 KB)
📄 MachineConstantPool.h(5.25 KB)
📄 MachineDominanceFrontier.h(2.93 KB)
📄 MachineDominators.h(9.59 KB)
📄 MachineFrameInfo.h(34.84 KB)
📄 MachineFunction.h(42.94 KB)
📄 MachineFunctionPass.h(2.93 KB)
📄 MachineInstr.h(73.72 KB)
📄 MachineInstrBuilder.h(22.84 KB)
📄 MachineInstrBundle.h(10.16 KB)
📄 MachineInstrBundleIterator.h(10.92 KB)
📄 MachineJumpTableInfo.h(4.66 KB)
📄 MachineLoopInfo.h(7.3 KB)
📄 MachineLoopUtils.h(1.74 KB)
📄 MachineMemOperand.h(12.69 KB)
📄 MachineModuleInfo.h(9.88 KB)
📄 MachineModuleInfoImpls.h(3.36 KB)
📄 MachineOperand.h(37.64 KB)
📄 MachineOptimizationRemarkEmitter.h(8.99 KB)
📄 MachineOutliner.h(8.04 KB)
📄 MachinePassRegistry.h(6.1 KB)
📄 MachinePipeliner.h(21.17 KB)
📄 MachinePostDominators.h(2.93 KB)
📄 MachineRegionInfo.h(5.93 KB)
📄 MachineRegisterInfo.h(46.75 KB)
📄 MachineSSAUpdater.h(4.37 KB)
📄 MachineScheduler.h(36.6 KB)
📄 MachineSizeOpts.h(1.86 KB)
📄 MachineTraceMetrics.h(17.17 KB)
📄 MacroFusion.h(1.96 KB)
📄 ModuloSchedule.h(15.8 KB)
📄 NonRelocatableStringpool.h(2.9 KB)
📁 PBQP
📄 PBQPRAConstraint.h(1.83 KB)
📄 ParallelCG.h(1.66 KB)
📄 Passes.h(18.96 KB)
📄 PreISelIntrinsicLowering.h(944 B)
📄 PseudoSourceValue.h(6.21 KB)
📄 RDFGraph.h(33.73 KB)
📄 RDFLiveness.h(5.01 KB)
📄 RDFRegisters.h(6.51 KB)
📄 ReachingDefAnalysis.h(10.68 KB)
📄 RegAllocPBQP.h(16.47 KB)
📄 RegAllocRegistry.h(2.27 KB)
📄 Register.h(5.61 KB)
📄 RegisterClassInfo.h(4.86 KB)
📄 RegisterPressure.h(21.04 KB)
📄 RegisterScavenging.h(8.73 KB)
📄 RegisterUsageInfo.h(2.3 KB)
📄 ResourcePriorityQueue.h(4.19 KB)
📄 RuntimeLibcalls.h(3.05 KB)
📄 SDNodeProperties.td(1.57 KB)
📄 ScheduleDAG.h(28.92 KB)
📄 ScheduleDAGInstrs.h(15.49 KB)
📄 ScheduleDAGMutation.h(1021 B)
📄 ScheduleDFS.h(5.79 KB)
📄 ScheduleHazardRecognizer.h(4.65 KB)
📄 SchedulerRegistry.h(4.27 KB)
📄 ScoreboardHazardRecognizer.h(3.7 KB)
📄 SelectionDAG.h(89.12 KB)
📄 SelectionDAGAddressAnalysis.h(3.58 KB)
📄 SelectionDAGISel.h(13.48 KB)
📄 SelectionDAGNodes.h(91.77 KB)
📄 SelectionDAGTargetInfo.h(7.99 KB)
📄 SlotIndexes.h(24.12 KB)
📄 Spiller.h(1.16 KB)
📄 StackMaps.h(11.45 KB)
📄 StackProtector.h(4.1 KB)
📄 SwiftErrorValueTracking.h(3.87 KB)
📄 SwitchLoweringUtils.h(9.51 KB)
📄 TailDuplicator.h(5.54 KB)
📄 TargetCallingConv.h(8.26 KB)
📄 TargetFrameLowering.h(19.21 KB)
📄 TargetInstrInfo.h(84.48 KB)
📄 TargetLowering.h(194.17 KB)
📄 TargetLoweringObjectFileImpl.h(11.63 KB)
📄 TargetOpcodes.h(1.37 KB)
📄 TargetPassConfig.h(17.9 KB)
📄 TargetRegisterInfo.h(48.65 KB)
📄 TargetSchedule.h(7.75 KB)
📄 TargetSubtargetInfo.h(12.53 KB)
📄 UnreachableBlockElim.h(1.39 KB)
📄 ValueTypes.h(17.2 KB)
📄 ValueTypes.td(11.42 KB)
📄 VirtRegMap.h(6.37 KB)
📄 WasmEHFuncInfo.h(1.92 KB)
📄 WinEHFuncInfo.h(4.01 KB)

Editing: GCMetadata.h

//===- GCMetadata.h - Garbage collector metadata ----------------*- C++ -*-===//
//
// 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 declares the GCFunctionInfo and GCModuleInfo classes, which are
// used as a communication channel from the target code generator to the target
// garbage collectors. This interface allows code generators and garbage
// collectors to be developed independently.
//
// The GCFunctionInfo class logs the data necessary to build a type accurate
// stack map. The code generator outputs:
//
//   - Safe points as specified by the GCStrategy's NeededSafePoints.
//   - Stack offsets for GC roots, as specified by calls to llvm.gcroot
//
// As a refinement, liveness analysis calculates the set of live roots at each
// safe point. Liveness analysis is not presently performed by the code
// generator, so all roots are assumed live.
//
// GCModuleInfo simply collects GCFunctionInfo instances for each Function as
// they are compiled. This accretion is necessary for collectors which must emit
// a stack map for the compilation unit as a whole. Therefore, GCFunctionInfo
// outlives the MachineFunction from which it is derived and must not refer to
// any code generator data structures.
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_CODEGEN_GCMETADATA_H
#define LLVM_CODEGEN_GCMETADATA_H

#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringMap.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/CodeGen/GCStrategy.h"
#include "llvm/IR/DebugLoc.h"
#include "llvm/Pass.h"
#include <algorithm>
#include <cstddef>
#include <cstdint>
#include <memory>
#include <vector>

namespace llvm {

class Constant;
class Function;
class MCSymbol;

/// GCPoint - Metadata for a collector-safe point in machine code.
///
struct GCPoint {
  MCSymbol *Label;    ///< A label.
  DebugLoc Loc;

GCPoint(MCSymbol *L, DebugLoc DL)
      : Label(L), Loc(std::move(DL)) {}
};

/// GCRoot - Metadata for a pointer to an object managed by the garbage
/// collector.
struct GCRoot {
  int Num;                  ///< Usually a frame index.
  int StackOffset = -1;     ///< Offset from the stack pointer.
  const Constant *Metadata; ///< Metadata straight from the call
                            ///< to llvm.gcroot.

GCRoot(int N, const Constant *MD) : Num(N), Metadata(MD) {}
};

/// Garbage collection metadata for a single function.  Currently, this
/// information only applies to GCStrategies which use GCRoot.
class GCFunctionInfo {
public:
  using iterator = std::vector<GCPoint>::iterator;
  using roots_iterator = std::vector<GCRoot>::iterator;
  using live_iterator = std::vector<GCRoot>::const_iterator;

private:
  const Function &F;
  GCStrategy &S;
  uint64_t FrameSize;
  std::vector<GCRoot> Roots;
  std::vector<GCPoint> SafePoints;

// FIXME: Liveness. A 2D BitVector, perhaps?
  //
  //   BitVector Liveness;
  //
  //   bool islive(int point, int root) =
  //     Liveness[point * SafePoints.size() + root]
  //
  // The bit vector is the more compact representation where >3.2% of roots
  // are live per safe point (1.5% on 64-bit hosts).

public:
  GCFunctionInfo(const Function &F, GCStrategy &S);
  ~GCFunctionInfo();

/// getFunction - Return the function to which this metadata applies.
  const Function &getFunction() const { return F; }

/// getStrategy - Return the GC strategy for the function.
  GCStrategy &getStrategy() { return S; }

/// addStackRoot - Registers a root that lives on the stack. Num is the
  ///                stack object ID for the alloca (if the code generator is
  //                 using  MachineFrameInfo).
  void addStackRoot(int Num, const Constant *Metadata) {
    Roots.push_back(GCRoot(Num, Metadata));
  }

/// removeStackRoot - Removes a root.
  roots_iterator removeStackRoot(roots_iterator position) {
    return Roots.erase(position);
  }

/// addSafePoint - Notes the existence of a safe point. Num is the ID of the
  /// label just prior to the safe point (if the code generator is using
  /// MachineModuleInfo).
  void addSafePoint(MCSymbol *Label, const DebugLoc &DL) {
    SafePoints.emplace_back(Label, DL);
  }

/// getFrameSize/setFrameSize - Records the function's frame size.
  uint64_t getFrameSize() const { return FrameSize; }
  void setFrameSize(uint64_t S) { FrameSize = S; }

/// begin/end - Iterators for safe points.
  iterator begin() { return SafePoints.begin(); }
  iterator end() { return SafePoints.end(); }
  size_t size() const { return SafePoints.size(); }

/// roots_begin/roots_end - Iterators for all roots in the function.
  roots_iterator roots_begin() { return Roots.begin(); }
  roots_iterator roots_end() { return Roots.end(); }
  size_t roots_size() const { return Roots.size(); }

/// live_begin/live_end - Iterators for live roots at a given safe point.
  live_iterator live_begin(const iterator &p) { return roots_begin(); }
  live_iterator live_end(const iterator &p) { return roots_end(); }
  size_t live_size(const iterator &p) const { return roots_size(); }
};

/// An analysis pass which caches information about the entire Module.
/// Records both the function level information used by GCRoots and a
/// cache of the 'active' gc strategy objects for the current Module.
class GCModuleInfo : public ImmutablePass {
  /// An owning list of all GCStrategies which have been created
  SmallVector<std::unique_ptr<GCStrategy>, 1> GCStrategyList;
  /// A helper map to speedup lookups into the above list
  StringMap<GCStrategy*> GCStrategyMap;

public:
  /// Lookup the GCStrategy object associated with the given gc name.
  /// Objects are owned internally; No caller should attempt to delete the
  /// returned objects.
  GCStrategy *getGCStrategy(const StringRef Name);

/// List of per function info objects.  In theory, Each of these
  /// may be associated with a different GC.
  using FuncInfoVec = std::vector<std::unique_ptr<GCFunctionInfo>>;

FuncInfoVec::iterator funcinfo_begin() { return Functions.begin(); }
  FuncInfoVec::iterator funcinfo_end() { return Functions.end(); }

private:
  /// Owning list of all GCFunctionInfos associated with this Module
  FuncInfoVec Functions;

/// Non-owning map to bypass linear search when finding the GCFunctionInfo
  /// associated with a particular Function.
  using finfo_map_type = DenseMap<const Function *, GCFunctionInfo *>;
  finfo_map_type FInfoMap;

public:
  using iterator = SmallVector<std::unique_ptr<GCStrategy>, 1>::const_iterator;

static char ID;

GCModuleInfo();

/// clear - Resets the pass. Any pass, which uses GCModuleInfo, should
  /// call it in doFinalization().
  ///
  void clear();

/// begin/end - Iterators for used strategies.
  ///
  iterator begin() const { return GCStrategyList.begin(); }
  iterator end() const { return GCStrategyList.end(); }

/// get - Look up function metadata.  This is currently assumed
  /// have the side effect of initializing the associated GCStrategy.  That
  /// will soon change.
  GCFunctionInfo &getFunctionInfo(const Function &F);
};

} // end namespace llvm

#endif // LLVM_CODEGEN_GCMETADATA_H

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