llvm/tools/llvm-profgen/ProfiledBinary.h

   1 //===-- ProfiledBinary.h - Binary decoder -----------------------*- C++ -*-===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #ifndef LLVM_TOOLS_LLVM_PROFGEN_PROFILEDBINARY_H
  10 #define LLVM_TOOLS_LLVM_PROFGEN_PROFILEDBINARY_H
  11
  12 #include "CallContext.h"
  13 #include "ErrorHandling.h"
  14 #include "llvm/ADT/DenseMap.h"
  15 #include "llvm/ADT/StringRef.h"
  16 #include "llvm/ADT/StringSet.h"
  17 #include "llvm/DebugInfo/DWARF/DWARFContext.h"
  18 #include "llvm/DebugInfo/Symbolize/Symbolize.h"
  19 #include "llvm/MC/MCAsmInfo.h"
  20 #include "llvm/MC/MCContext.h"
  21 #include "llvm/MC/MCDisassembler/MCDisassembler.h"
  22 #include "llvm/MC/MCInst.h"
  23 #include "llvm/MC/MCInstPrinter.h"
  24 #include "llvm/MC/MCInstrAnalysis.h"
  25 #include "llvm/MC/MCInstrInfo.h"
  26 #include "llvm/MC/MCObjectFileInfo.h"
  27 #include "llvm/MC/MCPseudoProbe.h"
  28 #include "llvm/MC/MCRegisterInfo.h"
  29 #include "llvm/MC/MCSubtargetInfo.h"
  30 #include "llvm/MC/MCTargetOptions.h"
  31 #include "llvm/Object/ELFObjectFile.h"
  32 #include "llvm/ProfileData/SampleProf.h"
  33 #include "llvm/Support/CommandLine.h"
  34 #include "llvm/Support/Path.h"
  35 #include "llvm/Transforms/IPO/SampleContextTracker.h"
  36 #include <list>
  37 #include <map>
  38 #include <set>
  39 #include <sstream>
  40 #include <string>
  41 #include <unordered_map>
  42 #include <unordered_set>
  43 #include <vector>
  44
  45 namespace llvm {
  46 extern cl::opt<bool> EnableCSPreInliner;
  47 extern cl::opt<bool> UseContextCostForPreInliner;
  48 } // namespace llvm
  49
  50 using namespace llvm;
  51 using namespace sampleprof;
  52 using namespace llvm::object;
  53
  54 namespace llvm {
  55 namespace sampleprof {
  56
  57 class ProfiledBinary;
  58 class MissingFrameInferrer;
  59
  60 struct InstructionPointer {
  61   const ProfiledBinary *Binary;
  62   // Address of the executable segment of the binary.
  63   uint64_t Address;
  64   // Index to the sorted code address array of the binary.
  65   uint64_t Index = 0;
  66   InstructionPointer(const ProfiledBinary *Binary, uint64_t Address,
  67                      bool RoundToNext = false);
  68   bool advance();
  69   bool backward();
  70   void update(uint64_t Addr);
  71 };
  72
  73 // The special frame addresses.
  74 enum SpecialFrameAddr {
  75   // Dummy root of frame trie.
  76   DummyRoot = 0,
  77   // Represent all the addresses outside of current binary.
  78   // This's also used to indicate the call stack should be truncated since this
  79   // isn't a real call context the compiler will see.
  80   ExternalAddr = 1,
  81 };
  82
  83 using RangesTy = std::vector<std::pair<uint64_t, uint64_t>>;
  84
  85 struct BinaryFunction {
  86   StringRef FuncName;
  87   // End of range is an exclusive bound.
  88   RangesTy Ranges;
  89
  90   uint64_t getFuncSize() {
  91     uint64_t Sum = 0;
  92     for (auto &R : Ranges) {
  93       Sum += R.second - R.first;
  94     }
  95     return Sum;
  96   }
  97 };
  98
  99 // Info about function range. A function can be split into multiple
 100 // non-continuous ranges, each range corresponds to one FuncRange.
 101 struct FuncRange {
 102   uint64_t StartAddress;
 103   // EndAddress is an exclusive bound.
 104   uint64_t EndAddress;
 105   // Function the range belongs to
 106   BinaryFunction *Func;
 107   // Whether the start address is the real entry of the function.
 108   bool IsFuncEntry = false;
 109
 110   StringRef getFuncName() { return Func->FuncName; }
 111 };
 112
 113 // PrologEpilog address tracker, used to filter out broken stack samples
 114 // Currently we use a heuristic size (two) to infer prolog and epilog
 115 // based on the start address and return address. In the future,
 116 // we will switch to Dwarf CFI based tracker
 117 struct PrologEpilogTracker {
 118   // A set of prolog and epilog addresses. Used by virtual unwinding.
 119   std::unordered_set<uint64_t> PrologEpilogSet;
 120   ProfiledBinary *Binary;
 121   PrologEpilogTracker(ProfiledBinary *Bin) : Binary(Bin){};
 122
 123   // Take the two addresses from the start of function as prolog
 124   void
 125   inferPrologAddresses(std::map<uint64_t, FuncRange> &FuncStartAddressMap) {
 126     for (auto I : FuncStartAddressMap) {
 127       PrologEpilogSet.insert(I.first);
 128       InstructionPointer IP(Binary, I.first);
 129       if (!IP.advance())
 130         break;
 131       PrologEpilogSet.insert(IP.Address);
 132     }
 133   }
 134
 135   // Take the last two addresses before the return address as epilog
 136   void inferEpilogAddresses(std::unordered_set<uint64_t> &RetAddrs) {
 137     for (auto Addr : RetAddrs) {
 138       PrologEpilogSet.insert(Addr);
 139       InstructionPointer IP(Binary, Addr);
 140       if (!IP.backward())
 141         break;
 142       PrologEpilogSet.insert(IP.Address);
 143     }
 144   }
 145 };
 146
 147 // Track function byte size under different context (outlined version as well as
 148 // various inlined versions). It also provides query support to get function
 149 // size with the best matching context, which is used to help pre-inliner use
 150 // accurate post-optimization size to make decisions.
 151 // TODO: If an inlinee is completely optimized away, ideally we should have zero
 152 // for its context size, currently we would misss such context since it doesn't
 153 // have instructions. To fix this, we need to mark all inlinee with entry probe
 154 // but without instructions as having zero size.
 155 class BinarySizeContextTracker {
 156 public:
 157   // Add instruction with given size to a context
 158   void addInstructionForContext(const SampleContextFrameVector &Context,
 159                                 uint32_t InstrSize);
 160
 161   // Get function size with a specific context. When there's no exact match
 162   // for the given context, try to retrieve the size of that function from
 163   // closest matching context.
 164   uint32_t getFuncSizeForContext(const ContextTrieNode *Context);
 165
 166   // For inlinees that are full optimized away, we can establish zero size using
 167   // their remaining probes.
 168   void trackInlineesOptimizedAway(MCPseudoProbeDecoder &ProbeDecoder);
 169
 170   using ProbeFrameStack = SmallVector<std::pair<StringRef, uint32_t>>;
 171   void trackInlineesOptimizedAway(MCPseudoProbeDecoder &ProbeDecoder,
 172                                   MCDecodedPseudoProbeInlineTree &ProbeNode,
 173                                   ProbeFrameStack &Context);
 174
 175   void dump() { RootContext.dumpTree(); }
 176
 177 private:
 178   // Root node for context trie tree, node that this is a reverse context trie
 179   // with callee as parent and caller as child. This way we can traverse from
 180   // root to find the best/longest matching context if an exact match does not
 181   // exist. It gives us the best possible estimate for function's post-inline,
 182   // post-optimization byte size.
 183   ContextTrieNode RootContext;
 184 };
 185
 186 using AddressRange = std::pair<uint64_t, uint64_t>;
 187
 188 class ProfiledBinary {
 189   // Absolute path of the executable binary.
 190   std::string Path;
 191   // Path of the debug info binary.
 192   std::string DebugBinaryPath;
 193   // The target triple.
 194   Triple TheTriple;
 195   // Path of symbolizer path which should be pointed to binary with debug info.
 196   StringRef SymbolizerPath;
 197   // Options used to configure the symbolizer
 198   symbolize::LLVMSymbolizer::Options SymbolizerOpts;
 199   // The runtime base address that the first executable segment is loaded at.
 200   uint64_t BaseAddress = 0;
 201   // The runtime base address that the first loadabe segment is loaded at.
 202   uint64_t FirstLoadableAddress = 0;
 203   // The preferred load address of each executable segment.
 204   std::vector<uint64_t> PreferredTextSegmentAddresses;
 205   // The file offset of each executable segment.
 206   std::vector<uint64_t> TextSegmentOffsets;
 207
 208   // Mutiple MC component info
 209   std::unique_ptr<const MCRegisterInfo> MRI;
 210   std::unique_ptr<const MCAsmInfo> AsmInfo;
 211   std::unique_ptr<const MCSubtargetInfo> STI;
 212   std::unique_ptr<const MCInstrInfo> MII;
 213   std::unique_ptr<MCDisassembler> DisAsm;
 214   std::unique_ptr<const MCInstrAnalysis> MIA;
 215   std::unique_ptr<MCInstPrinter> IPrinter;
 216   // A list of text sections sorted by start RVA and size. Used to check
 217   // if a given RVA is a valid code address.
 218   std::set<std::pair<uint64_t, uint64_t>> TextSections;
 219
 220   // A map of mapping function name to BinaryFunction info.
 221   std::unordered_map<std::string, BinaryFunction> BinaryFunctions;
 222
 223   // Lookup BinaryFunctions using the function name's MD5 hash. Needed if the
 224   // profile is using MD5.
 225   std::unordered_map<uint64_t, BinaryFunction *> HashBinaryFunctions;
 226
 227   // A list of binary functions that have samples.
 228   std::unordered_set<const BinaryFunction *> ProfiledFunctions;
 229
 230   // GUID to Elf symbol start address map
 231   DenseMap<uint64_t, uint64_t> SymbolStartAddrs;
 232
 233   // These maps are for temporary use of warning diagnosis.
 234   DenseSet<int64_t> AddrsWithMultipleSymbols;
 235   DenseSet<std::pair<uint64_t, uint64_t>> AddrsWithInvalidInstruction;
 236
 237   // Start address to Elf symbol GUID map
 238   std::unordered_multimap<uint64_t, uint64_t> StartAddrToSymMap;
 239
 240   // An ordered map of mapping function's start address to function range
 241   // relevant info. Currently to determine if the offset of ELF is the start of
 242   // a real function, we leverage the function range info from DWARF.
 243   std::map<uint64_t, FuncRange> StartAddrToFuncRangeMap;
 244
 245   // Address to context location map. Used to expand the context.
 246   std::unordered_map<uint64_t, SampleContextFrameVector> AddressToLocStackMap;
 247
 248   // Address to instruction size map. Also used for quick Address lookup.
 249   std::unordered_map<uint64_t, uint64_t> AddressToInstSizeMap;
 250
 251   // An array of Addresses of all instructions sorted in increasing order. The
 252   // sorting is needed to fast advance to the next forward/backward instruction.
 253   std::vector<uint64_t> CodeAddressVec;
 254   // A set of call instruction addresses. Used by virtual unwinding.
 255   std::unordered_set<uint64_t> CallAddressSet;
 256   // A set of return instruction addresses. Used by virtual unwinding.
 257   std::unordered_set<uint64_t> RetAddressSet;
 258   // An ordered set of unconditional branch instruction addresses.
 259   std::set<uint64_t> UncondBranchAddrSet;
 260   // A set of branch instruction addresses.
 261   std::unordered_set<uint64_t> BranchAddressSet;
 262
 263   // Estimate and track function prolog and epilog ranges.
 264   PrologEpilogTracker ProEpilogTracker;
 265
 266   // Infer missing frames due to compiler optimizations such as tail call
 267   // elimination.
 268   std::unique_ptr<MissingFrameInferrer> MissingContextInferrer;
 269
 270   // Track function sizes under different context
 271   BinarySizeContextTracker FuncSizeTracker;
 272
 273   // The symbolizer used to get inline context for an instruction.
 274   std::unique_ptr<symbolize::LLVMSymbolizer> Symbolizer;
 275
 276   // String table owning function name strings created from the symbolizer.
 277   std::unordered_set<std::string> NameStrings;
 278
 279   // A collection of functions to print disassembly for.
 280   StringSet<> DisassembleFunctionSet;
 281
 282   // Pseudo probe decoder
 283   MCPseudoProbeDecoder ProbeDecoder;
 284
 285   // Function name to probe frame map for top-level outlined functions.
 286   StringMap<MCDecodedPseudoProbeInlineTree *> TopLevelProbeFrameMap;
 287
 288   bool UsePseudoProbes = false;
 289
 290   bool UseFSDiscriminator = false;
 291
 292   // Whether we need to symbolize all instructions to get function context size.
 293   bool TrackFuncContextSize = false;
 294
 295   // Indicate if the base loading address is parsed from the mmap event or uses
 296   // the preferred address
 297   bool IsLoadedByMMap = false;
 298   // Use to avoid redundant warning.
 299   bool MissingMMapWarned = false;
 300
 301   void setPreferredTextSegmentAddresses(const ELFObjectFileBase *O);
 302
 303   template <class ELFT>
 304   void setPreferredTextSegmentAddresses(const ELFFile<ELFT> &Obj,
 305                                         StringRef FileName);
 306
 307   void checkPseudoProbe(const ELFObjectFileBase *Obj);
 308
 309   void decodePseudoProbe(const ELFObjectFileBase *Obj);
 310
 311   void
 312   checkUseFSDiscriminator(const ELFObjectFileBase *Obj,
 313                           std::map<SectionRef, SectionSymbolsTy> &AllSymbols);
 314
 315   // Set up disassembler and related components.
 316   void setUpDisassembler(const ELFObjectFileBase *Obj);
 317   symbolize::LLVMSymbolizer::Options getSymbolizerOpts() const;
 318
 319   // Load debug info of subprograms from DWARF section.
 320   void loadSymbolsFromDWARF(ObjectFile &Obj);
 321
 322   // Load debug info from DWARF unit.
 323   void loadSymbolsFromDWARFUnit(DWARFUnit &CompilationUnit);
 324
 325   // Create elf symbol to its start address mapping.
 326   void populateElfSymbolAddressList(const ELFObjectFileBase *O);
 327
 328   // A function may be spilt into multiple non-continuous address ranges. We use
 329   // this to set whether start a function range is the real entry of the
 330   // function and also set false to the non-function label.
 331   void setIsFuncEntry(FuncRange *FRange, StringRef RangeSymName);
 332
 333   // Warn if no entry range exists in the function.
 334   void warnNoFuncEntry();
 335
 336   /// Dissassemble the text section and build various address maps.
 337   void disassemble(const ELFObjectFileBase *O);
 338
 339   /// Helper function to dissassemble the symbol and extract info for unwinding
 340   bool dissassembleSymbol(std::size_t SI, ArrayRef<uint8_t> Bytes,
 341                           SectionSymbolsTy &Symbols, const SectionRef &Section);
 342   /// Symbolize a given instruction pointer and return a full call context.
 343   SampleContextFrameVector symbolize(const InstructionPointer &IP,
 344                                      bool UseCanonicalFnName = false,
 345                                      bool UseProbeDiscriminator = false);
 346   /// Decode the interesting parts of the binary and build internal data
 347   /// structures. On high level, the parts of interest are:
 348   ///   1. Text sections, including the main code section and the PLT
 349   ///   entries that will be used to handle cross-module call transitions.
 350   ///   2. The .debug_line section, used by Dwarf-based profile generation.
 351   ///   3. Pseudo probe related sections, used by probe-based profile
 352   ///   generation.
 353   void load();
 354
 355 public:
 356   ProfiledBinary(const StringRef ExeBinPath, const StringRef DebugBinPath);
 357   ~ProfiledBinary();
 358
 359   void decodePseudoProbe();
 360
 361   StringRef getPath() const { return Path; }
 362   StringRef getName() const { return llvm::sys::path::filename(Path); }
 363   uint64_t getBaseAddress() const { return BaseAddress; }
 364   void setBaseAddress(uint64_t Address) { BaseAddress = Address; }
 365
 366   // Canonicalize to use preferred load address as base address.
 367   uint64_t canonicalizeVirtualAddress(uint64_t Address) {
 368     return Address - BaseAddress + getPreferredBaseAddress();
 369   }
 370   // Return the preferred load address for the first executable segment.
 371   uint64_t getPreferredBaseAddress() const {
 372     return PreferredTextSegmentAddresses[0];
 373   }
 374   // Return the preferred load address for the first loadable segment.
 375   uint64_t getFirstLoadableAddress() const { return FirstLoadableAddress; }
 376   // Return the file offset for the first executable segment.
 377   uint64_t getTextSegmentOffset() const { return TextSegmentOffsets[0]; }
 378   const std::vector<uint64_t> &getPreferredTextSegmentAddresses() const {
 379     return PreferredTextSegmentAddresses;
 380   }
 381   const std::vector<uint64_t> &getTextSegmentOffsets() const {
 382     return TextSegmentOffsets;
 383   }
 384
 385   uint64_t getInstSize(uint64_t Address) const {
 386     auto I = AddressToInstSizeMap.find(Address);
 387     if (I == AddressToInstSizeMap.end())
 388       return 0;
 389     return I->second;
 390   }
 391
 392   bool addressIsCode(uint64_t Address) const {
 393     return AddressToInstSizeMap.find(Address) != AddressToInstSizeMap.end();
 394   }
 395
 396   bool addressIsCall(uint64_t Address) const {
 397     return CallAddressSet.count(Address);
 398   }
 399   bool addressIsReturn(uint64_t Address) const {
 400     return RetAddressSet.count(Address);
 401   }
 402   bool addressInPrologEpilog(uint64_t Address) const {
 403     return ProEpilogTracker.PrologEpilogSet.count(Address);
 404   }
 405
 406   bool addressIsTransfer(uint64_t Address) {
 407     return BranchAddressSet.count(Address) || RetAddressSet.count(Address) ||
 408            CallAddressSet.count(Address);
 409   }
 410
 411   bool rangeCrossUncondBranch(uint64_t Start, uint64_t End) {
 412     if (Start >= End)
 413       return false;
 414     auto R = UncondBranchAddrSet.lower_bound(Start);
 415     return R != UncondBranchAddrSet.end() && *R < End;
 416   }
 417
 418   uint64_t getAddressforIndex(uint64_t Index) const {
 419     return CodeAddressVec[Index];
 420   }
 421
 422   size_t getCodeAddrVecSize() const { return CodeAddressVec.size(); }
 423
 424   bool usePseudoProbes() const { return UsePseudoProbes; }
 425   bool useFSDiscriminator() const { return UseFSDiscriminator; }
 426   // Get the index in CodeAddressVec for the address
 427   // As we might get an address which is not the code
 428   // here it would round to the next valid code address by
 429   // using lower bound operation
 430   uint32_t getIndexForAddr(uint64_t Address) const {
 431     auto Low = llvm::lower_bound(CodeAddressVec, Address);
 432     return Low - CodeAddressVec.begin();
 433   }
 434
 435   uint64_t getCallAddrFromFrameAddr(uint64_t FrameAddr) const {
 436     if (FrameAddr == ExternalAddr)
 437       return ExternalAddr;
 438     auto I = getIndexForAddr(FrameAddr);
 439     FrameAddr = I ? getAddressforIndex(I - 1) : 0;
 440     if (FrameAddr && addressIsCall(FrameAddr))
 441       return FrameAddr;
 442     return 0;
 443   }
 444
 445   FuncRange *findFuncRangeForStartAddr(uint64_t Address) {
 446     auto I = StartAddrToFuncRangeMap.find(Address);
 447     if (I == StartAddrToFuncRangeMap.end())
 448       return nullptr;
 449     return &I->second;
 450   }
 451
 452   // Binary search the function range which includes the input address.
 453   FuncRange *findFuncRange(uint64_t Address) {
 454     auto I = StartAddrToFuncRangeMap.upper_bound(Address);
 455     if (I == StartAddrToFuncRangeMap.begin())
 456       return nullptr;
 457     I--;
 458
 459     if (Address >= I->second.EndAddress)
 460       return nullptr;
 461
 462     return &I->second;
 463   }
 464
 465   // Get all ranges of one function.
 466   RangesTy getRanges(uint64_t Address) {
 467     auto *FRange = findFuncRange(Address);
 468     // Ignore the range which falls into plt section or system lib.
 469     if (!FRange)
 470       return RangesTy();
 471
 472     return FRange->Func->Ranges;
 473   }
 474
 475   const std::unordered_map<std::string, BinaryFunction> &
 476   getAllBinaryFunctions() {
 477     return BinaryFunctions;
 478   }
 479
 480   std::unordered_set<const BinaryFunction *> &getProfiledFunctions() {
 481     return ProfiledFunctions;
 482   }
 483
 484   void setProfiledFunctions(std::unordered_set<const BinaryFunction *> &Funcs) {
 485     ProfiledFunctions = Funcs;
 486   }
 487
 488   BinaryFunction *getBinaryFunction(FunctionId FName) {
 489     if (FName.isStringRef()) {
 490       auto I = BinaryFunctions.find(FName.str());
 491       if (I == BinaryFunctions.end())
 492         return nullptr;
 493       return &I->second;
 494     }
 495     auto I = HashBinaryFunctions.find(FName.getHashCode());
 496     if (I == HashBinaryFunctions.end())
 497       return nullptr;
 498     return I->second;
 499   }
 500
 501   uint32_t getFuncSizeForContext(const ContextTrieNode *ContextNode) {
 502     return FuncSizeTracker.getFuncSizeForContext(ContextNode);
 503   }
 504
 505   void inferMissingFrames(const SmallVectorImpl<uint64_t> &Context,
 506                           SmallVectorImpl<uint64_t> &NewContext);
 507
 508   // Load the symbols from debug table and populate into symbol list.
 509   void populateSymbolListFromDWARF(ProfileSymbolList &SymbolList);
 510
 511   SampleContextFrameVector
 512   getFrameLocationStack(uint64_t Address, bool UseProbeDiscriminator = false) {
 513     InstructionPointer IP(this, Address);
 514     return symbolize(IP, SymbolizerOpts.UseSymbolTable, UseProbeDiscriminator);
 515   }
 516
 517   const SampleContextFrameVector &
 518   getCachedFrameLocationStack(uint64_t Address,
 519                               bool UseProbeDiscriminator = false) {
 520     auto I = AddressToLocStackMap.emplace(Address, SampleContextFrameVector());
 521     if (I.second) {
 522       I.first->second = getFrameLocationStack(Address, UseProbeDiscriminator);
 523     }
 524     return I.first->second;
 525   }
 526
 527   std::optional<SampleContextFrame> getInlineLeafFrameLoc(uint64_t Address) {
 528     const auto &Stack = getCachedFrameLocationStack(Address);
 529     if (Stack.empty())
 530       return {};
 531     return Stack.back();
 532   }
 533
 534   void flushSymbolizer() { Symbolizer.reset(); }
 535
 536   MissingFrameInferrer *getMissingContextInferrer() {
 537     return MissingContextInferrer.get();
 538   }
 539
 540   // Compare two addresses' inline context
 541   bool inlineContextEqual(uint64_t Add1, uint64_t Add2);
 542
 543   // Get the full context of the current stack with inline context filled in.
 544   // It will search the disassembling info stored in AddressToLocStackMap. This
 545   // is used as the key of function sample map
 546   SampleContextFrameVector
 547   getExpandedContext(const SmallVectorImpl<uint64_t> &Stack,
 548                      bool &WasLeafInlined);
 549   // Go through instructions among the given range and record its size for the
 550   // inline context.
 551   void computeInlinedContextSizeForRange(uint64_t StartAddress,
 552                                          uint64_t EndAddress);
 553
 554   void computeInlinedContextSizeForFunc(const BinaryFunction *Func);
 555
 556   const MCDecodedPseudoProbe *getCallProbeForAddr(uint64_t Address) const {
 557     return ProbeDecoder.getCallProbeForAddr(Address);
 558   }
 559
 560   void getInlineContextForProbe(const MCDecodedPseudoProbe *Probe,
 561                                 SampleContextFrameVector &InlineContextStack,
 562                                 bool IncludeLeaf = false) const {
 563     SmallVector<MCPseduoProbeFrameLocation, 16> ProbeInlineContext;
 564     ProbeDecoder.getInlineContextForProbe(Probe, ProbeInlineContext,
 565                                           IncludeLeaf);
 566     for (uint32_t I = 0; I < ProbeInlineContext.size(); I++) {
 567       auto &Callsite = ProbeInlineContext[I];
 568       // Clear the current context for an unknown probe.
 569       if (Callsite.second == 0 && I != ProbeInlineContext.size() - 1) {
 570         InlineContextStack.clear();
 571         continue;
 572       }
 573       InlineContextStack.emplace_back(FunctionId(Callsite.first),
 574                                       LineLocation(Callsite.second, 0));
 575     }
 576   }
 577   const AddressProbesMap &getAddress2ProbesMap() const {
 578     return ProbeDecoder.getAddress2ProbesMap();
 579   }
 580   const MCPseudoProbeFuncDesc *getFuncDescForGUID(uint64_t GUID) {
 581     return ProbeDecoder.getFuncDescForGUID(GUID);
 582   }
 583
 584   const MCPseudoProbeFuncDesc *
 585   getInlinerDescForProbe(const MCDecodedPseudoProbe *Probe) {
 586     return ProbeDecoder.getInlinerDescForProbe(Probe);
 587   }
 588
 589   bool getTrackFuncContextSize() { return TrackFuncContextSize; }
 590
 591   bool getIsLoadedByMMap() { return IsLoadedByMMap; }
 592
 593   void setIsLoadedByMMap(bool Value) { IsLoadedByMMap = Value; }
 594
 595   bool getMissingMMapWarned() { return MissingMMapWarned; }
 596
 597   void setMissingMMapWarned(bool Value) { MissingMMapWarned = Value; }
 598 };
 599
 600 } // end namespace sampleprof
 601 } // end namespace llvm
 602
 603 #endif