lib/ProfileData/InstrProf.cpp

   1 //===- InstrProf.cpp - Instrumented profiling format support --------------===//
   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 // This file contains support for clang's instrumentation based PGO and
  10 // coverage.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "llvm/ProfileData/InstrProf.h"
  15 #include "llvm/ADT/ArrayRef.h"
  16 #include "llvm/ADT/SmallString.h"
  17 #include "llvm/ADT/SmallVector.h"
  18 #include "llvm/ADT/StringExtras.h"
  19 #include "llvm/ADT/StringRef.h"
  20 #include "llvm/ADT/Triple.h"
  21 #include "llvm/IR/Constant.h"
  22 #include "llvm/IR/Constants.h"
  23 #include "llvm/IR/Function.h"
  24 #include "llvm/IR/GlobalValue.h"
  25 #include "llvm/IR/GlobalVariable.h"
  26 #include "llvm/IR/Instruction.h"
  27 #include "llvm/IR/LLVMContext.h"
  28 #include "llvm/IR/MDBuilder.h"
  29 #include "llvm/IR/Metadata.h"
  30 #include "llvm/IR/Module.h"
  31 #include "llvm/IR/Type.h"
  32 #include "llvm/ProfileData/InstrProfReader.h"
  33 #include "llvm/Support/Casting.h"
  34 #include "llvm/Support/CommandLine.h"
  35 #include "llvm/Support/Compiler.h"
  36 #include "llvm/Support/Compression.h"
  37 #include "llvm/Support/Endian.h"
  38 #include "llvm/Support/Error.h"
  39 #include "llvm/Support/ErrorHandling.h"
  40 #include "llvm/Support/LEB128.h"
  41 #include "llvm/Support/ManagedStatic.h"
  42 #include "llvm/Support/MathExtras.h"
  43 #include "llvm/Support/Path.h"
  44 #include "llvm/Support/SwapByteOrder.h"
  45 #include <algorithm>
  46 #include <cassert>
  47 #include <cstddef>
  48 #include <cstdint>
  49 #include <cstring>
  50 #include <memory>
  51 #include <string>
  52 #include <system_error>
  53 #include <utility>
  54 #include <vector>
  55
  56 using namespace llvm;
  57
  58 static cl::opt<bool> StaticFuncFullModulePrefix(
  59     "static-func-full-module-prefix", cl::init(true), cl::Hidden,
  60     cl::desc("Use full module build paths in the profile counter names for "
  61              "static functions."));
  62
  63 // This option is tailored to users that have different top-level directory in
  64 // profile-gen and profile-use compilation. Users need to specific the number
  65 // of levels to strip. A value larger than the number of directories in the
  66 // source file will strip all the directory names and only leave the basename.
  67 //
  68 // Note current ThinLTO module importing for the indirect-calls assumes
  69 // the source directory name not being stripped. A non-zero option value here
  70 // can potentially prevent some inter-module indirect-call-promotions.
  71 static cl::opt<unsigned> StaticFuncStripDirNamePrefix(
  72     "static-func-strip-dirname-prefix", cl::init(0), cl::Hidden,
  73     cl::desc("Strip specified level of directory name from source path in "
  74              "the profile counter name for static functions."));
  75
  76 static std::string getInstrProfErrString(instrprof_error Err) {
  77   switch (Err) {
  78   case instrprof_error::success:
  79     return "Success";
  80   case instrprof_error::eof:
  81     return "End of File";
  82   case instrprof_error::unrecognized_format:
  83     return "Unrecognized instrumentation profile encoding format";
  84   case instrprof_error::bad_magic:
  85     return "Invalid instrumentation profile data (bad magic)";
  86   case instrprof_error::bad_header:
  87     return "Invalid instrumentation profile data (file header is corrupt)";
  88   case instrprof_error::unsupported_version:
  89     return "Unsupported instrumentation profile format version";
  90   case instrprof_error::unsupported_hash_type:
  91     return "Unsupported instrumentation profile hash type";
  92   case instrprof_error::too_large:
  93     return "Too much profile data";
  94   case instrprof_error::truncated:
  95     return "Truncated profile data";
  96   case instrprof_error::malformed:
  97     return "Malformed instrumentation profile data";
  98   case instrprof_error::unknown_function:
  99     return "No profile data available for function";
 100   case instrprof_error::hash_mismatch:
 101     return "Function control flow change detected (hash mismatch)";
 102   case instrprof_error::count_mismatch:
 103     return "Function basic block count change detected (counter mismatch)";
 104   case instrprof_error::counter_overflow:
 105     return "Counter overflow";
 106   case instrprof_error::value_site_count_mismatch:
 107     return "Function value site count change detected (counter mismatch)";
 108   case instrprof_error::compress_failed:
 109     return "Failed to compress data (zlib)";
 110   case instrprof_error::uncompress_failed:
 111     return "Failed to uncompress data (zlib)";
 112   case instrprof_error::empty_raw_profile:
 113     return "Empty raw profile file";
 114   case instrprof_error::zlib_unavailable:
 115     return "Profile uses zlib compression but the profile reader was built without zlib support";
 116   }
 117   llvm_unreachable("A value of instrprof_error has no message.");
 118 }
 119
 120 namespace {
 121
 122 // FIXME: This class is only here to support the transition to llvm::Error. It
 123 // will be removed once this transition is complete. Clients should prefer to
 124 // deal with the Error value directly, rather than converting to error_code.
 125 class InstrProfErrorCategoryType : public std::error_category {
 126   const char *name() const noexcept override { return "llvm.instrprof"; }
 127
 128   std::string message(int IE) const override {
 129     return getInstrProfErrString(static_cast<instrprof_error>(IE));
 130   }
 131 };
 132
 133 } // end anonymous namespace
 134
 135 static ManagedStatic<InstrProfErrorCategoryType> ErrorCategory;
 136
 137 const std::error_category &llvm::instrprof_category() {
 138   return *ErrorCategory;
 139 }
 140
 141 namespace {
 142
 143 const char *InstrProfSectNameCommon[] = {
 144 #define INSTR_PROF_SECT_ENTRY(Kind, SectNameCommon, SectNameCoff, Prefix)      \
 145   SectNameCommon,
 146 #include "llvm/ProfileData/InstrProfData.inc"
 147 };
 148
 149 const char *InstrProfSectNameCoff[] = {
 150 #define INSTR_PROF_SECT_ENTRY(Kind, SectNameCommon, SectNameCoff, Prefix)      \
 151   SectNameCoff,
 152 #include "llvm/ProfileData/InstrProfData.inc"
 153 };
 154
 155 const char *InstrProfSectNamePrefix[] = {
 156 #define INSTR_PROF_SECT_ENTRY(Kind, SectNameCommon, SectNameCoff, Prefix)      \
 157   Prefix,
 158 #include "llvm/ProfileData/InstrProfData.inc"
 159 };
 160
 161 } // namespace
 162
 163 namespace llvm {
 164
 165 std::string getInstrProfSectionName(InstrProfSectKind IPSK,
 166                                     Triple::ObjectFormatType OF,
 167                                     bool AddSegmentInfo) {
 168   std::string SectName;
 169
 170   if (OF == Triple::MachO && AddSegmentInfo)
 171     SectName = InstrProfSectNamePrefix[IPSK];
 172
 173   if (OF == Triple::COFF)
 174     SectName += InstrProfSectNameCoff[IPSK];
 175   else
 176     SectName += InstrProfSectNameCommon[IPSK];
 177
 178   if (OF == Triple::MachO && IPSK == IPSK_data && AddSegmentInfo)
 179     SectName += ",regular,live_support";
 180
 181   return SectName;
 182 }
 183
 184 void SoftInstrProfErrors::addError(instrprof_error IE) {
 185   if (IE == instrprof_error::success)
 186     return;
 187
 188   if (FirstError == instrprof_error::success)
 189     FirstError = IE;
 190
 191   switch (IE) {
 192   case instrprof_error::hash_mismatch:
 193     ++NumHashMismatches;
 194     break;
 195   case instrprof_error::count_mismatch:
 196     ++NumCountMismatches;
 197     break;
 198   case instrprof_error::counter_overflow:
 199     ++NumCounterOverflows;
 200     break;
 201   case instrprof_error::value_site_count_mismatch:
 202     ++NumValueSiteCountMismatches;
 203     break;
 204   default:
 205     llvm_unreachable("Not a soft error");
 206   }
 207 }
 208
 209 std::string InstrProfError::message() const {
 210   return getInstrProfErrString(Err);
 211 }
 212
 213 char InstrProfError::ID = 0;
 214
 215 std::string getPGOFuncName(StringRef RawFuncName,
 216                            GlobalValue::LinkageTypes Linkage,
 217                            StringRef FileName,
 218                            uint64_t Version LLVM_ATTRIBUTE_UNUSED) {
 219   return GlobalValue::getGlobalIdentifier(RawFuncName, Linkage, FileName);
 220 }
 221
 222 // Strip NumPrefix level of directory name from PathNameStr. If the number of
 223 // directory separators is less than NumPrefix, strip all the directories and
 224 // leave base file name only.
 225 static StringRef stripDirPrefix(StringRef PathNameStr, uint32_t NumPrefix) {
 226   uint32_t Count = NumPrefix;
 227   uint32_t Pos = 0, LastPos = 0;
 228   for (auto & CI : PathNameStr) {
 229     ++Pos;
 230     if (llvm::sys::path::is_separator(CI)) {
 231       LastPos = Pos;
 232       --Count;
 233     }
 234     if (Count == 0)
 235       break;
 236   }
 237   return PathNameStr.substr(LastPos);
 238 }
 239
 240 // Return the PGOFuncName. This function has some special handling when called
 241 // in LTO optimization. The following only applies when calling in LTO passes
 242 // (when \c InLTO is true): LTO's internalization privatizes many global linkage
 243 // symbols. This happens after value profile annotation, but those internal
 244 // linkage functions should not have a source prefix.
 245 // Additionally, for ThinLTO mode, exported internal functions are promoted
 246 // and renamed. We need to ensure that the original internal PGO name is
 247 // used when computing the GUID that is compared against the profiled GUIDs.
 248 // To differentiate compiler generated internal symbols from original ones,
 249 // PGOFuncName meta data are created and attached to the original internal
 250 // symbols in the value profile annotation step
 251 // (PGOUseFunc::annotateIndirectCallSites). If a symbol does not have the meta
 252 // data, its original linkage must be non-internal.
 253 std::string getPGOFuncName(const Function &F, bool InLTO, uint64_t Version) {
 254   if (!InLTO) {
 255     StringRef FileName(F.getParent()->getSourceFileName());
 256     uint32_t StripLevel = StaticFuncFullModulePrefix ? 0 : (uint32_t)-1;
 257     if (StripLevel < StaticFuncStripDirNamePrefix)
 258       StripLevel = StaticFuncStripDirNamePrefix;
 259     if (StripLevel)
 260       FileName = stripDirPrefix(FileName, StripLevel);
 261     return getPGOFuncName(F.getName(), F.getLinkage(), FileName, Version);
 262   }
 263
 264   // In LTO mode (when InLTO is true), first check if there is a meta data.
 265   if (MDNode *MD = getPGOFuncNameMetadata(F)) {
 266     StringRef S = cast<MDString>(MD->getOperand(0))->getString();
 267     return S.str();
 268   }
 269
 270   // If there is no meta data, the function must be a global before the value
 271   // profile annotation pass. Its current linkage may be internal if it is
 272   // internalized in LTO mode.
 273   return getPGOFuncName(F.getName(), GlobalValue::ExternalLinkage, "");
 274 }
 275
 276 StringRef getFuncNameWithoutPrefix(StringRef PGOFuncName, StringRef FileName) {
 277   if (FileName.empty())
 278     return PGOFuncName;
 279   // Drop the file name including ':'. See also getPGOFuncName.
 280   if (PGOFuncName.startswith(FileName))
 281     PGOFuncName = PGOFuncName.drop_front(FileName.size() + 1);
 282   return PGOFuncName;
 283 }
 284
 285 // \p FuncName is the string used as profile lookup key for the function. A
 286 // symbol is created to hold the name. Return the legalized symbol name.
 287 std::string getPGOFuncNameVarName(StringRef FuncName,
 288                                   GlobalValue::LinkageTypes Linkage) {
 289   std::string VarName = getInstrProfNameVarPrefix();
 290   VarName += FuncName;
 291
 292   if (!GlobalValue::isLocalLinkage(Linkage))
 293     return VarName;
 294
 295   // Now fix up illegal chars in local VarName that may upset the assembler.
 296   const char *InvalidChars = "-:<>/\"'";
 297   size_t found = VarName.find_first_of(InvalidChars);
 298   while (found != std::string::npos) {
 299     VarName[found] = '_';
 300     found = VarName.find_first_of(InvalidChars, found + 1);
 301   }
 302   return VarName;
 303 }
 304
 305 GlobalVariable *createPGOFuncNameVar(Module &M,
 306                                      GlobalValue::LinkageTypes Linkage,
 307                                      StringRef PGOFuncName) {
 308   // We generally want to match the function's linkage, but available_externally
 309   // and extern_weak both have the wrong semantics, and anything that doesn't
 310   // need to link across compilation units doesn't need to be visible at all.
 311   if (Linkage == GlobalValue::ExternalWeakLinkage)
 312     Linkage = GlobalValue::LinkOnceAnyLinkage;
 313   else if (Linkage == GlobalValue::AvailableExternallyLinkage)
 314     Linkage = GlobalValue::LinkOnceODRLinkage;
 315   else if (Linkage == GlobalValue::InternalLinkage ||
 316            Linkage == GlobalValue::ExternalLinkage)
 317     Linkage = GlobalValue::PrivateLinkage;
 318
 319   auto *Value =
 320       ConstantDataArray::getString(M.getContext(), PGOFuncName, false);
 321   auto FuncNameVar =
 322       new GlobalVariable(M, Value->getType(), true, Linkage, Value,
 323                          getPGOFuncNameVarName(PGOFuncName, Linkage));
 324
 325   // Hide the symbol so that we correctly get a copy for each executable.
 326   if (!GlobalValue::isLocalLinkage(FuncNameVar->getLinkage()))
 327     FuncNameVar->setVisibility(GlobalValue::HiddenVisibility);
 328
 329   return FuncNameVar;
 330 }
 331
 332 GlobalVariable *createPGOFuncNameVar(Function &F, StringRef PGOFuncName) {
 333   return createPGOFuncNameVar(*F.getParent(), F.getLinkage(), PGOFuncName);
 334 }
 335
 336 Error InstrProfSymtab::create(Module &M, bool InLTO) {
 337   for (Function &F : M) {
 338     // Function may not have a name: like using asm("") to overwrite the name.
 339     // Ignore in this case.
 340     if (!F.hasName())
 341       continue;
 342     const std::string &PGOFuncName = getPGOFuncName(F, InLTO);
 343     if (Error E = addFuncName(PGOFuncName))
 344       return E;
 345     MD5FuncMap.emplace_back(Function::getGUID(PGOFuncName), &F);
 346     // In ThinLTO, local function may have been promoted to global and have
 347     // suffix added to the function name. We need to add the stripped function
 348     // name to the symbol table so that we can find a match from profile.
 349     if (InLTO) {
 350       auto pos = PGOFuncName.find('.');
 351       if (pos != std::string::npos) {
 352         const std::string &OtherFuncName = PGOFuncName.substr(0, pos);
 353         if (Error E = addFuncName(OtherFuncName))
 354           return E;
 355         MD5FuncMap.emplace_back(Function::getGUID(OtherFuncName), &F);
 356       }
 357     }
 358   }
 359   Sorted = false;
 360   finalizeSymtab();
 361   return Error::success();
 362 }
 363
 364 uint64_t InstrProfSymtab::getFunctionHashFromAddress(uint64_t Address) {
 365   finalizeSymtab();
 366   auto It = partition_point(AddrToMD5Map, [=](std::pair<uint64_t, uint64_t> A) {
 367     return A.first < Address;
 368   });
 369   // Raw function pointer collected by value profiler may be from
 370   // external functions that are not instrumented. They won't have
 371   // mapping data to be used by the deserializer. Force the value to
 372   // be 0 in this case.
 373   if (It != AddrToMD5Map.end() && It->first == Address)
 374     return (uint64_t)It->second;
 375   return 0;
 376 }
 377
 378 Error collectPGOFuncNameStrings(ArrayRef<std::string> NameStrs,
 379                                 bool doCompression, std::string &Result) {
 380   assert(!NameStrs.empty() && "No name data to emit");
 381
 382   uint8_t Header[16], *P = Header;
 383   std::string UncompressedNameStrings =
 384       join(NameStrs.begin(), NameStrs.end(), getInstrProfNameSeparator());
 385
 386   assert(StringRef(UncompressedNameStrings)
 387                  .count(getInstrProfNameSeparator()) == (NameStrs.size() - 1) &&
 388          "PGO name is invalid (contains separator token)");
 389
 390   unsigned EncLen = encodeULEB128(UncompressedNameStrings.length(), P);
 391   P += EncLen;
 392
 393   auto WriteStringToResult = [&](size_t CompressedLen, StringRef InputStr) {
 394     EncLen = encodeULEB128(CompressedLen, P);
 395     P += EncLen;
 396     char *HeaderStr = reinterpret_cast<char *>(&Header[0]);
 397     unsigned HeaderLen = P - &Header[0];
 398     Result.append(HeaderStr, HeaderLen);
 399     Result += InputStr;
 400     return Error::success();
 401   };
 402
 403   if (!doCompression) {
 404     return WriteStringToResult(0, UncompressedNameStrings);
 405   }
 406
 407   SmallString<128> CompressedNameStrings;
 408   Error E = zlib::compress(StringRef(UncompressedNameStrings),
 409                            CompressedNameStrings, zlib::BestSizeCompression);
 410   if (E) {
 411     consumeError(std::move(E));
 412     return make_error<InstrProfError>(instrprof_error::compress_failed);
 413   }
 414
 415   return WriteStringToResult(CompressedNameStrings.size(),
 416                              CompressedNameStrings);
 417 }
 418
 419 StringRef getPGOFuncNameVarInitializer(GlobalVariable *NameVar) {
 420   auto *Arr = cast<ConstantDataArray>(NameVar->getInitializer());
 421   StringRef NameStr =
 422       Arr->isCString() ? Arr->getAsCString() : Arr->getAsString();
 423   return NameStr;
 424 }
 425
 426 Error collectPGOFuncNameStrings(ArrayRef<GlobalVariable *> NameVars,
 427                                 std::string &Result, bool doCompression) {
 428   std::vector<std::string> NameStrs;
 429   for (auto *NameVar : NameVars) {
 430     NameStrs.push_back(getPGOFuncNameVarInitializer(NameVar));
 431   }
 432   return collectPGOFuncNameStrings(
 433       NameStrs, zlib::isAvailable() && doCompression, Result);
 434 }
 435
 436 Error readPGOFuncNameStrings(StringRef NameStrings, InstrProfSymtab &Symtab) {
 437   const uint8_t *P = NameStrings.bytes_begin();
 438   const uint8_t *EndP = NameStrings.bytes_end();
 439   while (P < EndP) {
 440     uint32_t N;
 441     uint64_t UncompressedSize = decodeULEB128(P, &N);
 442     P += N;
 443     uint64_t CompressedSize = decodeULEB128(P, &N);
 444     P += N;
 445     bool isCompressed = (CompressedSize != 0);
 446     SmallString<128> UncompressedNameStrings;
 447     StringRef NameStrings;
 448     if (isCompressed) {
 449       if (!llvm::zlib::isAvailable())
 450         return make_error<InstrProfError>(instrprof_error::zlib_unavailable);
 451
 452       StringRef CompressedNameStrings(reinterpret_cast<const char *>(P),
 453                                       CompressedSize);
 454       if (Error E =
 455               zlib::uncompress(CompressedNameStrings, UncompressedNameStrings,
 456                                UncompressedSize)) {
 457         consumeError(std::move(E));
 458         return make_error<InstrProfError>(instrprof_error::uncompress_failed);
 459       }
 460       P += CompressedSize;
 461       NameStrings = StringRef(UncompressedNameStrings.data(),
 462                               UncompressedNameStrings.size());
 463     } else {
 464       NameStrings =
 465           StringRef(reinterpret_cast<const char *>(P), UncompressedSize);
 466       P += UncompressedSize;
 467     }
 468     // Now parse the name strings.
 469     SmallVector<StringRef, 0> Names;
 470     NameStrings.split(Names, getInstrProfNameSeparator());
 471     for (StringRef &Name : Names)
 472       if (Error E = Symtab.addFuncName(Name))
 473         return E;
 474
 475     while (P < EndP && *P == 0)
 476       P++;
 477   }
 478   return Error::success();
 479 }
 480
 481 void InstrProfRecord::accumulateCounts(CountSumOrPercent &Sum) const {
 482   uint64_t FuncSum = 0;
 483   Sum.NumEntries += Counts.size();
 484   for (size_t F = 0, E = Counts.size(); F < E; ++F)
 485     FuncSum += Counts[F];
 486   Sum.CountSum += FuncSum;
 487
 488   for (uint32_t VK = IPVK_First; VK <= IPVK_Last; ++VK) {
 489     uint64_t KindSum = 0;
 490     uint32_t NumValueSites = getNumValueSites(VK);
 491     for (size_t I = 0; I < NumValueSites; ++I) {
 492       uint32_t NV = getNumValueDataForSite(VK, I);
 493       std::unique_ptr<InstrProfValueData[]> VD = getValueForSite(VK, I);
 494       for (uint32_t V = 0; V < NV; V++)
 495         KindSum += VD[V].Count;
 496     }
 497     Sum.ValueCounts[VK] += KindSum;
 498   }
 499 }
 500
 501 void InstrProfValueSiteRecord::overlap(InstrProfValueSiteRecord &Input,
 502                                        uint32_t ValueKind,
 503                                        OverlapStats &Overlap,
 504                                        OverlapStats &FuncLevelOverlap) {
 505   this->sortByTargetValues();
 506   Input.sortByTargetValues();
 507   double Score = 0.0f, FuncLevelScore = 0.0f;
 508   auto I = ValueData.begin();
 509   auto IE = ValueData.end();
 510   auto J = Input.ValueData.begin();
 511   auto JE = Input.ValueData.end();
 512   while (I != IE && J != JE) {
 513     if (I->Value == J->Value) {
 514       Score += OverlapStats::score(I->Count, J->Count,
 515                                    Overlap.Base.ValueCounts[ValueKind],
 516                                    Overlap.Test.ValueCounts[ValueKind]);
 517       FuncLevelScore += OverlapStats::score(
 518           I->Count, J->Count, FuncLevelOverlap.Base.ValueCounts[ValueKind],
 519           FuncLevelOverlap.Test.ValueCounts[ValueKind]);
 520       ++I;
 521     } else if (I->Value < J->Value) {
 522       ++I;
 523       continue;
 524     }
 525     ++J;
 526   }
 527   Overlap.Overlap.ValueCounts[ValueKind] += Score;
 528   FuncLevelOverlap.Overlap.ValueCounts[ValueKind] += FuncLevelScore;
 529 }
 530
 531 // Return false on mismatch.
 532 void InstrProfRecord::overlapValueProfData(uint32_t ValueKind,
 533                                            InstrProfRecord &Other,
 534                                            OverlapStats &Overlap,
 535                                            OverlapStats &FuncLevelOverlap) {
 536   uint32_t ThisNumValueSites = getNumValueSites(ValueKind);
 537   assert(ThisNumValueSites == Other.getNumValueSites(ValueKind));
 538   if (!ThisNumValueSites)
 539     return;
 540
 541   std::vector<InstrProfValueSiteRecord> &ThisSiteRecords =
 542       getOrCreateValueSitesForKind(ValueKind);
 543   MutableArrayRef<InstrProfValueSiteRecord> OtherSiteRecords =
 544       Other.getValueSitesForKind(ValueKind);
 545   for (uint32_t I = 0; I < ThisNumValueSites; I++)
 546     ThisSiteRecords[I].overlap(OtherSiteRecords[I], ValueKind, Overlap,
 547                                FuncLevelOverlap);
 548 }
 549
 550 void InstrProfRecord::overlap(InstrProfRecord &Other, OverlapStats &Overlap,
 551                               OverlapStats &FuncLevelOverlap,
 552                               uint64_t ValueCutoff) {
 553   // FuncLevel CountSum for other should already computed and nonzero.
 554   assert(FuncLevelOverlap.Test.CountSum >= 1.0f);
 555   accumulateCounts(FuncLevelOverlap.Base);
 556   bool Mismatch = (Counts.size() != Other.Counts.size());
 557
 558   // Check if the value profiles mismatch.
 559   if (!Mismatch) {
 560     for (uint32_t Kind = IPVK_First; Kind <= IPVK_Last; ++Kind) {
 561       uint32_t ThisNumValueSites = getNumValueSites(Kind);
 562       uint32_t OtherNumValueSites = Other.getNumValueSites(Kind);
 563       if (ThisNumValueSites != OtherNumValueSites) {
 564         Mismatch = true;
 565         break;
 566       }
 567     }
 568   }
 569   if (Mismatch) {
 570     Overlap.addOneMismatch(FuncLevelOverlap.Test);
 571     return;
 572   }
 573
 574   // Compute overlap for value counts.
 575   for (uint32_t Kind = IPVK_First; Kind <= IPVK_Last; ++Kind)
 576     overlapValueProfData(Kind, Other, Overlap, FuncLevelOverlap);
 577
 578   double Score = 0.0;
 579   uint64_t MaxCount = 0;
 580   // Compute overlap for edge counts.
 581   for (size_t I = 0, E = Other.Counts.size(); I < E; ++I) {
 582     Score += OverlapStats::score(Counts[I], Other.Counts[I],
 583                                  Overlap.Base.CountSum, Overlap.Test.CountSum);
 584     MaxCount = std::max(Other.Counts[I], MaxCount);
 585   }
 586   Overlap.Overlap.CountSum += Score;
 587   Overlap.Overlap.NumEntries += 1;
 588
 589   if (MaxCount >= ValueCutoff) {
 590     double FuncScore = 0.0;
 591     for (size_t I = 0, E = Other.Counts.size(); I < E; ++I)
 592       FuncScore += OverlapStats::score(Counts[I], Other.Counts[I],
 593                                        FuncLevelOverlap.Base.CountSum,
 594                                        FuncLevelOverlap.Test.CountSum);
 595     FuncLevelOverlap.Overlap.CountSum = FuncScore;
 596     FuncLevelOverlap.Overlap.NumEntries = Other.Counts.size();
 597     FuncLevelOverlap.Valid = true;
 598   }
 599 }
 600
 601 void InstrProfValueSiteRecord::merge(InstrProfValueSiteRecord &Input,
 602                                      uint64_t Weight,
 603                                      function_ref<void(instrprof_error)> Warn) {
 604   this->sortByTargetValues();
 605   Input.sortByTargetValues();
 606   auto I = ValueData.begin();
 607   auto IE = ValueData.end();
 608   for (auto J = Input.ValueData.begin(), JE = Input.ValueData.end(); J != JE;
 609        ++J) {
 610     while (I != IE && I->Value < J->Value)
 611       ++I;
 612     if (I != IE && I->Value == J->Value) {
 613       bool Overflowed;
 614       I->Count = SaturatingMultiplyAdd(J->Count, Weight, I->Count, &Overflowed);
 615       if (Overflowed)
 616         Warn(instrprof_error::counter_overflow);
 617       ++I;
 618       continue;
 619     }
 620     ValueData.insert(I, *J);
 621   }
 622 }
 623
 624 void InstrProfValueSiteRecord::scale(uint64_t Weight,
 625                                      function_ref<void(instrprof_error)> Warn) {
 626   for (auto I = ValueData.begin(), IE = ValueData.end(); I != IE; ++I) {
 627     bool Overflowed;
 628     I->Count = SaturatingMultiply(I->Count, Weight, &Overflowed);
 629     if (Overflowed)
 630       Warn(instrprof_error::counter_overflow);
 631   }
 632 }
 633
 634 // Merge Value Profile data from Src record to this record for ValueKind.
 635 // Scale merged value counts by \p Weight.
 636 void InstrProfRecord::mergeValueProfData(
 637     uint32_t ValueKind, InstrProfRecord &Src, uint64_t Weight,
 638     function_ref<void(instrprof_error)> Warn) {
 639   uint32_t ThisNumValueSites = getNumValueSites(ValueKind);
 640   uint32_t OtherNumValueSites = Src.getNumValueSites(ValueKind);
 641   if (ThisNumValueSites != OtherNumValueSites) {
 642     Warn(instrprof_error::value_site_count_mismatch);
 643     return;
 644   }
 645   if (!ThisNumValueSites)
 646     return;
 647   std::vector<InstrProfValueSiteRecord> &ThisSiteRecords =
 648       getOrCreateValueSitesForKind(ValueKind);
 649   MutableArrayRef<InstrProfValueSiteRecord> OtherSiteRecords =
 650       Src.getValueSitesForKind(ValueKind);
 651   for (uint32_t I = 0; I < ThisNumValueSites; I++)
 652     ThisSiteRecords[I].merge(OtherSiteRecords[I], Weight, Warn);
 653 }
 654
 655 void InstrProfRecord::merge(InstrProfRecord &Other, uint64_t Weight,
 656                             function_ref<void(instrprof_error)> Warn) {
 657   // If the number of counters doesn't match we either have bad data
 658   // or a hash collision.
 659   if (Counts.size() != Other.Counts.size()) {
 660     Warn(instrprof_error::count_mismatch);
 661     return;
 662   }
 663
 664   for (size_t I = 0, E = Other.Counts.size(); I < E; ++I) {
 665     bool Overflowed;
 666     Counts[I] =
 667         SaturatingMultiplyAdd(Other.Counts[I], Weight, Counts[I], &Overflowed);
 668     if (Overflowed)
 669       Warn(instrprof_error::counter_overflow);
 670   }
 671
 672   for (uint32_t Kind = IPVK_First; Kind <= IPVK_Last; ++Kind)
 673     mergeValueProfData(Kind, Other, Weight, Warn);
 674 }
 675
 676 void InstrProfRecord::scaleValueProfData(
 677     uint32_t ValueKind, uint64_t Weight,
 678     function_ref<void(instrprof_error)> Warn) {
 679   for (auto &R : getValueSitesForKind(ValueKind))
 680     R.scale(Weight, Warn);
 681 }
 682
 683 void InstrProfRecord::scale(uint64_t Weight,
 684                             function_ref<void(instrprof_error)> Warn) {
 685   for (auto &Count : this->Counts) {
 686     bool Overflowed;
 687     Count = SaturatingMultiply(Count, Weight, &Overflowed);
 688     if (Overflowed)
 689       Warn(instrprof_error::counter_overflow);
 690   }
 691   for (uint32_t Kind = IPVK_First; Kind <= IPVK_Last; ++Kind)
 692     scaleValueProfData(Kind, Weight, Warn);
 693 }
 694
 695 // Map indirect call target name hash to name string.
 696 uint64_t InstrProfRecord::remapValue(uint64_t Value, uint32_t ValueKind,
 697                                      InstrProfSymtab *SymTab) {
 698   if (!SymTab)
 699     return Value;
 700
 701   if (ValueKind == IPVK_IndirectCallTarget)
 702     return SymTab->getFunctionHashFromAddress(Value);
 703
 704   return Value;
 705 }
 706
 707 void InstrProfRecord::addValueData(uint32_t ValueKind, uint32_t Site,
 708                                    InstrProfValueData *VData, uint32_t N,
 709                                    InstrProfSymtab *ValueMap) {
 710   for (uint32_t I = 0; I < N; I++) {
 711     VData[I].Value = remapValue(VData[I].Value, ValueKind, ValueMap);
 712   }
 713   std::vector<InstrProfValueSiteRecord> &ValueSites =
 714       getOrCreateValueSitesForKind(ValueKind);
 715   if (N == 0)
 716     ValueSites.emplace_back();
 717   else
 718     ValueSites.emplace_back(VData, VData + N);
 719 }
 720
 721 #define INSTR_PROF_COMMON_API_IMPL
 722 #include "llvm/ProfileData/InstrProfData.inc"
 723
 724 /*!
 725  * ValueProfRecordClosure Interface implementation for  InstrProfRecord
 726  *  class. These C wrappers are used as adaptors so that C++ code can be
 727  *  invoked as callbacks.
 728  */
 729 uint32_t getNumValueKindsInstrProf(const void *Record) {
 730   return reinterpret_cast<const InstrProfRecord *>(Record)->getNumValueKinds();
 731 }
 732
 733 uint32_t getNumValueSitesInstrProf(const void *Record, uint32_t VKind) {
 734   return reinterpret_cast<const InstrProfRecord *>(Record)
 735       ->getNumValueSites(VKind);
 736 }
 737
 738 uint32_t getNumValueDataInstrProf(const void *Record, uint32_t VKind) {
 739   return reinterpret_cast<const InstrProfRecord *>(Record)
 740       ->getNumValueData(VKind);
 741 }
 742
 743 uint32_t getNumValueDataForSiteInstrProf(const void *R, uint32_t VK,
 744                                          uint32_t S) {
 745   return reinterpret_cast<const InstrProfRecord *>(R)
 746       ->getNumValueDataForSite(VK, S);
 747 }
 748
 749 void getValueForSiteInstrProf(const void *R, InstrProfValueData *Dst,
 750                               uint32_t K, uint32_t S) {
 751   reinterpret_cast<const InstrProfRecord *>(R)->getValueForSite(Dst, K, S);
 752 }
 753
 754 ValueProfData *allocValueProfDataInstrProf(size_t TotalSizeInBytes) {
 755   ValueProfData *VD =
 756       (ValueProfData *)(new (::operator new(TotalSizeInBytes)) ValueProfData());
 757   memset(VD, 0, TotalSizeInBytes);
 758   return VD;
 759 }
 760
 761 static ValueProfRecordClosure InstrProfRecordClosure = {
 762     nullptr,
 763     getNumValueKindsInstrProf,
 764     getNumValueSitesInstrProf,
 765     getNumValueDataInstrProf,
 766     getNumValueDataForSiteInstrProf,
 767     nullptr,
 768     getValueForSiteInstrProf,
 769     allocValueProfDataInstrProf};
 770
 771 // Wrapper implementation using the closure mechanism.
 772 uint32_t ValueProfData::getSize(const InstrProfRecord &Record) {
 773   auto Closure = InstrProfRecordClosure;
 774   Closure.Record = &Record;
 775   return getValueProfDataSize(&Closure);
 776 }
 777
 778 // Wrapper implementation using the closure mechanism.
 779 std::unique_ptr<ValueProfData>
 780 ValueProfData::serializeFrom(const InstrProfRecord &Record) {
 781   InstrProfRecordClosure.Record = &Record;
 782
 783   std::unique_ptr<ValueProfData> VPD(
 784       serializeValueProfDataFrom(&InstrProfRecordClosure, nullptr));
 785   return VPD;
 786 }
 787
 788 void ValueProfRecord::deserializeTo(InstrProfRecord &Record,
 789                                     InstrProfSymtab *SymTab) {
 790   Record.reserveSites(Kind, NumValueSites);
 791
 792   InstrProfValueData *ValueData = getValueProfRecordValueData(this);
 793   for (uint64_t VSite = 0; VSite < NumValueSites; ++VSite) {
 794     uint8_t ValueDataCount = this->SiteCountArray[VSite];
 795     Record.addValueData(Kind, VSite, ValueData, ValueDataCount, SymTab);
 796     ValueData += ValueDataCount;
 797   }
 798 }
 799
 800 // For writing/serializing,  Old is the host endianness, and  New is
 801 // byte order intended on disk. For Reading/deserialization, Old
 802 // is the on-disk source endianness, and New is the host endianness.
 803 void ValueProfRecord::swapBytes(support::endianness Old,
 804                                 support::endianness New) {
 805   using namespace support;
 806
 807   if (Old == New)
 808     return;
 809
 810   if (getHostEndianness() != Old) {
 811     sys::swapByteOrder<uint32_t>(NumValueSites);
 812     sys::swapByteOrder<uint32_t>(Kind);
 813   }
 814   uint32_t ND = getValueProfRecordNumValueData(this);
 815   InstrProfValueData *VD = getValueProfRecordValueData(this);
 816
 817   // No need to swap byte array: SiteCountArrray.
 818   for (uint32_t I = 0; I < ND; I++) {
 819     sys::swapByteOrder<uint64_t>(VD[I].Value);
 820     sys::swapByteOrder<uint64_t>(VD[I].Count);
 821   }
 822   if (getHostEndianness() == Old) {
 823     sys::swapByteOrder<uint32_t>(NumValueSites);
 824     sys::swapByteOrder<uint32_t>(Kind);
 825   }
 826 }
 827
 828 void ValueProfData::deserializeTo(InstrProfRecord &Record,
 829                                   InstrProfSymtab *SymTab) {
 830   if (NumValueKinds == 0)
 831     return;
 832
 833   ValueProfRecord *VR = getFirstValueProfRecord(this);
 834   for (uint32_t K = 0; K < NumValueKinds; K++) {
 835     VR->deserializeTo(Record, SymTab);
 836     VR = getValueProfRecordNext(VR);
 837   }
 838 }
 839
 840 template <class T>
 841 static T swapToHostOrder(const unsigned char *&D, support::endianness Orig) {
 842   using namespace support;
 843
 844   if (Orig == little)
 845     return endian::readNext<T, little, unaligned>(D);
 846   else
 847     return endian::readNext<T, big, unaligned>(D);
 848 }
 849
 850 static std::unique_ptr<ValueProfData> allocValueProfData(uint32_t TotalSize) {
 851   return std::unique_ptr<ValueProfData>(new (::operator new(TotalSize))
 852                                             ValueProfData());
 853 }
 854
 855 Error ValueProfData::checkIntegrity() {
 856   if (NumValueKinds > IPVK_Last + 1)
 857     return make_error<InstrProfError>(instrprof_error::malformed);
 858   // Total size needs to be mulltiple of quadword size.
 859   if (TotalSize % sizeof(uint64_t))
 860     return make_error<InstrProfError>(instrprof_error::malformed);
 861
 862   ValueProfRecord *VR = getFirstValueProfRecord(this);
 863   for (uint32_t K = 0; K < this->NumValueKinds; K++) {
 864     if (VR->Kind > IPVK_Last)
 865       return make_error<InstrProfError>(instrprof_error::malformed);
 866     VR = getValueProfRecordNext(VR);
 867     if ((char *)VR - (char *)this > (ptrdiff_t)TotalSize)
 868       return make_error<InstrProfError>(instrprof_error::malformed);
 869   }
 870   return Error::success();
 871 }
 872
 873 Expected<std::unique_ptr<ValueProfData>>
 874 ValueProfData::getValueProfData(const unsigned char *D,
 875                                 const unsigned char *const BufferEnd,
 876                                 support::endianness Endianness) {
 877   using namespace support;
 878
 879   if (D + sizeof(ValueProfData) > BufferEnd)
 880     return make_error<InstrProfError>(instrprof_error::truncated);
 881
 882   const unsigned char *Header = D;
 883   uint32_t TotalSize = swapToHostOrder<uint32_t>(Header, Endianness);
 884   if (D + TotalSize > BufferEnd)
 885     return make_error<InstrProfError>(instrprof_error::too_large);
 886
 887   std::unique_ptr<ValueProfData> VPD = allocValueProfData(TotalSize);
 888   memcpy(VPD.get(), D, TotalSize);
 889   // Byte swap.
 890   VPD->swapBytesToHost(Endianness);
 891
 892   Error E = VPD->checkIntegrity();
 893   if (E)
 894     return std::move(E);
 895
 896   return std::move(VPD);
 897 }
 898
 899 void ValueProfData::swapBytesToHost(support::endianness Endianness) {
 900   using namespace support;
 901
 902   if (Endianness == getHostEndianness())
 903     return;
 904
 905   sys::swapByteOrder<uint32_t>(TotalSize);
 906   sys::swapByteOrder<uint32_t>(NumValueKinds);
 907
 908   ValueProfRecord *VR = getFirstValueProfRecord(this);
 909   for (uint32_t K = 0; K < NumValueKinds; K++) {
 910     VR->swapBytes(Endianness, getHostEndianness());
 911     VR = getValueProfRecordNext(VR);
 912   }
 913 }
 914
 915 void ValueProfData::swapBytesFromHost(support::endianness Endianness) {
 916   using namespace support;
 917
 918   if (Endianness == getHostEndianness())
 919     return;
 920
 921   ValueProfRecord *VR = getFirstValueProfRecord(this);
 922   for (uint32_t K = 0; K < NumValueKinds; K++) {
 923     ValueProfRecord *NVR = getValueProfRecordNext(VR);
 924     VR->swapBytes(getHostEndianness(), Endianness);
 925     VR = NVR;
 926   }
 927   sys::swapByteOrder<uint32_t>(TotalSize);
 928   sys::swapByteOrder<uint32_t>(NumValueKinds);
 929 }
 930
 931 void annotateValueSite(Module &M, Instruction &Inst,
 932                        const InstrProfRecord &InstrProfR,
 933                        InstrProfValueKind ValueKind, uint32_t SiteIdx,
 934                        uint32_t MaxMDCount) {
 935   uint32_t NV = InstrProfR.getNumValueDataForSite(ValueKind, SiteIdx);
 936   if (!NV)
 937     return;
 938
 939   uint64_t Sum = 0;
 940   std::unique_ptr<InstrProfValueData[]> VD =
 941       InstrProfR.getValueForSite(ValueKind, SiteIdx, &Sum);
 942
 943   ArrayRef<InstrProfValueData> VDs(VD.get(), NV);
 944   annotateValueSite(M, Inst, VDs, Sum, ValueKind, MaxMDCount);
 945 }
 946
 947 void annotateValueSite(Module &M, Instruction &Inst,
 948                        ArrayRef<InstrProfValueData> VDs,
 949                        uint64_t Sum, InstrProfValueKind ValueKind,
 950                        uint32_t MaxMDCount) {
 951   LLVMContext &Ctx = M.getContext();
 952   MDBuilder MDHelper(Ctx);
 953   SmallVector<Metadata *, 3> Vals;
 954   // Tag
 955   Vals.push_back(MDHelper.createString("VP"));
 956   // Value Kind
 957   Vals.push_back(MDHelper.createConstant(
 958       ConstantInt::get(Type::getInt32Ty(Ctx), ValueKind)));
 959   // Total Count
 960   Vals.push_back(
 961       MDHelper.createConstant(ConstantInt::get(Type::getInt64Ty(Ctx), Sum)));
 962
 963   // Value Profile Data
 964   uint32_t MDCount = MaxMDCount;
 965   for (auto &VD : VDs) {
 966     Vals.push_back(MDHelper.createConstant(
 967         ConstantInt::get(Type::getInt64Ty(Ctx), VD.Value)));
 968     Vals.push_back(MDHelper.createConstant(
 969         ConstantInt::get(Type::getInt64Ty(Ctx), VD.Count)));
 970     if (--MDCount == 0)
 971       break;
 972   }
 973   Inst.setMetadata(LLVMContext::MD_prof, MDNode::get(Ctx, Vals));
 974 }
 975
 976 bool getValueProfDataFromInst(const Instruction &Inst,
 977                               InstrProfValueKind ValueKind,
 978                               uint32_t MaxNumValueData,
 979                               InstrProfValueData ValueData[],
 980                               uint32_t &ActualNumValueData, uint64_t &TotalC) {
 981   MDNode *MD = Inst.getMetadata(LLVMContext::MD_prof);
 982   if (!MD)
 983     return false;
 984
 985   unsigned NOps = MD->getNumOperands();
 986
 987   if (NOps < 5)
 988     return false;
 989
 990   // Operand 0 is a string tag "VP":
 991   MDString *Tag = cast<MDString>(MD->getOperand(0));
 992   if (!Tag)
 993     return false;
 994
 995   if (!Tag->getString().equals("VP"))
 996     return false;
 997
 998   // Now check kind:
 999   ConstantInt *KindInt = mdconst::dyn_extract<ConstantInt>(MD->getOperand(1));
1000   if (!KindInt)
1001     return false;
1002   if (KindInt->getZExtValue() != ValueKind)
1003     return false;
1004
1005   // Get total count
1006   ConstantInt *TotalCInt = mdconst::dyn_extract<ConstantInt>(MD->getOperand(2));
1007   if (!TotalCInt)
1008     return false;
1009   TotalC = TotalCInt->getZExtValue();
1010
1011   ActualNumValueData = 0;
1012
1013   for (unsigned I = 3; I < NOps; I += 2) {
1014     if (ActualNumValueData >= MaxNumValueData)
1015       break;
1016     ConstantInt *Value = mdconst::dyn_extract<ConstantInt>(MD->getOperand(I));
1017     ConstantInt *Count =
1018         mdconst::dyn_extract<ConstantInt>(MD->getOperand(I + 1));
1019     if (!Value || !Count)
1020       return false;
1021     ValueData[ActualNumValueData].Value = Value->getZExtValue();
1022     ValueData[ActualNumValueData].Count = Count->getZExtValue();
1023     ActualNumValueData++;
1024   }
1025   return true;
1026 }
1027
1028 MDNode *getPGOFuncNameMetadata(const Function &F) {
1029   return F.getMetadata(getPGOFuncNameMetadataName());
1030 }
1031
1032 void createPGOFuncNameMetadata(Function &F, StringRef PGOFuncName) {
1033   // Only for internal linkage functions.
1034   if (PGOFuncName == F.getName())
1035       return;
1036   // Don't create duplicated meta-data.
1037   if (getPGOFuncNameMetadata(F))
1038     return;
1039   LLVMContext &C = F.getContext();
1040   MDNode *N = MDNode::get(C, MDString::get(C, PGOFuncName));
1041   F.setMetadata(getPGOFuncNameMetadataName(), N);
1042 }
1043
1044 bool needsComdatForCounter(const Function &F, const Module &M) {
1045   if (F.hasComdat())
1046     return true;
1047
1048   if (!Triple(M.getTargetTriple()).supportsCOMDAT())
1049     return false;
1050
1051   // See createPGOFuncNameVar for more details. To avoid link errors, profile
1052   // counters for function with available_externally linkage needs to be changed
1053   // to linkonce linkage. On ELF based systems, this leads to weak symbols to be
1054   // created. Without using comdat, duplicate entries won't be removed by the
1055   // linker leading to increased data segement size and raw profile size. Even
1056   // worse, since the referenced counter from profile per-function data object
1057   // will be resolved to the common strong definition, the profile counts for
1058   // available_externally functions will end up being duplicated in raw profile
1059   // data. This can result in distorted profile as the counts of those dups
1060   // will be accumulated by the profile merger.
1061   GlobalValue::LinkageTypes Linkage = F.getLinkage();
1062   if (Linkage != GlobalValue::ExternalWeakLinkage &&
1063       Linkage != GlobalValue::AvailableExternallyLinkage)
1064     return false;
1065
1066   return true;
1067 }
1068
1069 // Check if INSTR_PROF_RAW_VERSION_VAR is defined.
1070 bool isIRPGOFlagSet(const Module *M) {
1071   auto IRInstrVar =
1072       M->getNamedGlobal(INSTR_PROF_QUOTE(INSTR_PROF_RAW_VERSION_VAR));
1073   if (!IRInstrVar || IRInstrVar->isDeclaration() ||
1074       IRInstrVar->hasLocalLinkage())
1075     return false;
1076
1077   // Check if the flag is set.
1078   if (!IRInstrVar->hasInitializer())
1079     return false;
1080
1081   auto *InitVal = dyn_cast_or_null<ConstantInt>(IRInstrVar->getInitializer());
1082   if (!InitVal)
1083     return false;
1084   return (InitVal->getZExtValue() & VARIANT_MASK_IR_PROF) != 0;
1085 }
1086
1087 // Check if we can safely rename this Comdat function.
1088 bool canRenameComdatFunc(const Function &F, bool CheckAddressTaken) {
1089   if (F.getName().empty())
1090     return false;
1091   if (!needsComdatForCounter(F, *(F.getParent())))
1092     return false;
1093   // Unsafe to rename the address-taken function (which can be used in
1094   // function comparison).
1095   if (CheckAddressTaken && F.hasAddressTaken())
1096     return false;
1097   // Only safe to do if this function may be discarded if it is not used
1098   // in the compilation unit.
1099   if (!GlobalValue::isDiscardableIfUnused(F.getLinkage()))
1100     return false;
1101
1102   // For AvailableExternallyLinkage functions.
1103   if (!F.hasComdat()) {
1104     assert(F.getLinkage() == GlobalValue::AvailableExternallyLinkage);
1105     return true;
1106   }
1107   return true;
1108 }
1109
1110 // Parse the value profile options.
1111 void getMemOPSizeRangeFromOption(StringRef MemOPSizeRange, int64_t &RangeStart,
1112                                  int64_t &RangeLast) {
1113   static const int64_t DefaultMemOPSizeRangeStart = 0;
1114   static const int64_t DefaultMemOPSizeRangeLast = 8;
1115   RangeStart = DefaultMemOPSizeRangeStart;
1116   RangeLast = DefaultMemOPSizeRangeLast;
1117
1118   if (!MemOPSizeRange.empty()) {
1119     auto Pos = MemOPSizeRange.find(':');
1120     if (Pos != std::string::npos) {
1121       if (Pos > 0)
1122         MemOPSizeRange.substr(0, Pos).getAsInteger(10, RangeStart);
1123       if (Pos < MemOPSizeRange.size() - 1)
1124         MemOPSizeRange.substr(Pos + 1).getAsInteger(10, RangeLast);
1125     } else
1126       MemOPSizeRange.getAsInteger(10, RangeLast);
1127   }
1128   assert(RangeLast >= RangeStart);
1129 }
1130
1131 // Create a COMDAT variable INSTR_PROF_RAW_VERSION_VAR to make the runtime
1132 // aware this is an ir_level profile so it can set the version flag.
1133 void createIRLevelProfileFlagVar(Module &M, bool IsCS) {
1134   const StringRef VarName(INSTR_PROF_QUOTE(INSTR_PROF_RAW_VERSION_VAR));
1135   Type *IntTy64 = Type::getInt64Ty(M.getContext());
1136   uint64_t ProfileVersion = (INSTR_PROF_RAW_VERSION | VARIANT_MASK_IR_PROF);
1137   if (IsCS)
1138     ProfileVersion |= VARIANT_MASK_CSIR_PROF;
1139   auto IRLevelVersionVariable = new GlobalVariable(
1140       M, IntTy64, true, GlobalValue::WeakAnyLinkage,
1141       Constant::getIntegerValue(IntTy64, APInt(64, ProfileVersion)), VarName);
1142   IRLevelVersionVariable->setVisibility(GlobalValue::DefaultVisibility);
1143   Triple TT(M.getTargetTriple());
1144   if (TT.supportsCOMDAT()) {
1145     IRLevelVersionVariable->setLinkage(GlobalValue::ExternalLinkage);
1146     IRLevelVersionVariable->setComdat(M.getOrInsertComdat(VarName));
1147   }
1148 }
1149
1150 // Create the variable for the profile file name.
1151 void createProfileFileNameVar(Module &M, StringRef InstrProfileOutput) {
1152   if (InstrProfileOutput.empty())
1153     return;
1154   Constant *ProfileNameConst =
1155       ConstantDataArray::getString(M.getContext(), InstrProfileOutput, true);
1156   GlobalVariable *ProfileNameVar = new GlobalVariable(
1157       M, ProfileNameConst->getType(), true, GlobalValue::WeakAnyLinkage,
1158       ProfileNameConst, INSTR_PROF_QUOTE(INSTR_PROF_PROFILE_NAME_VAR));
1159   Triple TT(M.getTargetTriple());
1160   if (TT.supportsCOMDAT()) {
1161     ProfileNameVar->setLinkage(GlobalValue::ExternalLinkage);
1162     ProfileNameVar->setComdat(M.getOrInsertComdat(
1163         StringRef(INSTR_PROF_QUOTE(INSTR_PROF_PROFILE_NAME_VAR))));
1164   }
1165 }
1166
1167 Error OverlapStats::accumulateCounts(const std::string &BaseFilename,
1168                                      const std::string &TestFilename,
1169                                      bool IsCS) {
1170   auto getProfileSum = [IsCS](const std::string &Filename,
1171                               CountSumOrPercent &Sum) -> Error {
1172     auto ReaderOrErr = InstrProfReader::create(Filename);
1173     if (Error E = ReaderOrErr.takeError()) {
1174       return E;
1175     }
1176     auto Reader = std::move(ReaderOrErr.get());
1177     Reader->accumulateCounts(Sum, IsCS);
1178     return Error::success();
1179   };
1180   auto Ret = getProfileSum(BaseFilename, Base);
1181   if (Ret)
1182     return Ret;
1183   Ret = getProfileSum(TestFilename, Test);
1184   if (Ret)
1185     return Ret;
1186   this->BaseFilename = &BaseFilename;
1187   this->TestFilename = &TestFilename;
1188   Valid = true;
1189   return Error::success();
1190 }
1191
1192 void OverlapStats::addOneMismatch(const CountSumOrPercent &MismatchFunc) {
1193   Mismatch.NumEntries += 1;
1194   Mismatch.CountSum += MismatchFunc.CountSum / Test.CountSum;
1195   for (unsigned I = 0; I < IPVK_Last - IPVK_First + 1; I++) {
1196     if (Test.ValueCounts[I] >= 1.0f)
1197       Mismatch.ValueCounts[I] +=
1198           MismatchFunc.ValueCounts[I] / Test.ValueCounts[I];
1199   }
1200 }
1201
1202 void OverlapStats::addOneUnique(const CountSumOrPercent &UniqueFunc) {
1203   Unique.NumEntries += 1;
1204   Unique.CountSum += UniqueFunc.CountSum / Test.CountSum;
1205   for (unsigned I = 0; I < IPVK_Last - IPVK_First + 1; I++) {
1206     if (Test.ValueCounts[I] >= 1.0f)
1207       Unique.ValueCounts[I] += UniqueFunc.ValueCounts[I] / Test.ValueCounts[I];
1208   }
1209 }
1210
1211 void OverlapStats::dump(raw_fd_ostream &OS) const {
1212   if (!Valid)
1213     return;
1214
1215   const char *EntryName =
1216       (Level == ProgramLevel ? "functions" : "edge counters");
1217   if (Level == ProgramLevel) {
1218     OS << "Profile overlap infomation for base_profile: " << *BaseFilename
1219        << " and test_profile: " << *TestFilename << "\nProgram level:\n";
1220   } else {
1221     OS << "Function level:\n"
1222        << "  Function: " << FuncName << " (Hash=" << FuncHash << ")\n";
1223   }
1224
1225   OS << "  # of " << EntryName << " overlap: " << Overlap.NumEntries << "\n";
1226   if (Mismatch.NumEntries)
1227     OS << "  # of " << EntryName << " mismatch: " << Mismatch.NumEntries
1228        << "\n";
1229   if (Unique.NumEntries)
1230     OS << "  # of " << EntryName
1231        << " only in test_profile: " << Unique.NumEntries << "\n";
1232
1233   OS << "  Edge profile overlap: " << format("%.3f%%", Overlap.CountSum * 100)
1234      << "\n";
1235   if (Mismatch.NumEntries)
1236     OS << "  Mismatched count percentage (Edge): "
1237        << format("%.3f%%", Mismatch.CountSum * 100) << "\n";
1238   if (Unique.NumEntries)
1239     OS << "  Percentage of Edge profile only in test_profile: "
1240        << format("%.3f%%", Unique.CountSum * 100) << "\n";
1241   OS << "  Edge profile base count sum: " << format("%.0f", Base.CountSum)
1242      << "\n"
1243      << "  Edge profile test count sum: " << format("%.0f", Test.CountSum)
1244      << "\n";
1245
1246   for (unsigned I = 0; I < IPVK_Last - IPVK_First + 1; I++) {
1247     if (Base.ValueCounts[I] < 1.0f && Test.ValueCounts[I] < 1.0f)
1248       continue;
1249     char ProfileKindName[20];
1250     switch (I) {
1251     case IPVK_IndirectCallTarget:
1252       strncpy(ProfileKindName, "IndirectCall", 19);
1253       break;
1254     case IPVK_MemOPSize:
1255       strncpy(ProfileKindName, "MemOP", 19);
1256       break;
1257     default:
1258       snprintf(ProfileKindName, 19, "VP[%d]", I);
1259       break;
1260     }
1261     OS << "  " << ProfileKindName
1262        << " profile overlap: " << format("%.3f%%", Overlap.ValueCounts[I] * 100)
1263        << "\n";
1264     if (Mismatch.NumEntries)
1265       OS << "  Mismatched count percentage (" << ProfileKindName
1266          << "): " << format("%.3f%%", Mismatch.ValueCounts[I] * 100) << "\n";
1267     if (Unique.NumEntries)
1268       OS << "  Percentage of " << ProfileKindName
1269          << " profile only in test_profile: "
1270          << format("%.3f%%", Unique.ValueCounts[I] * 100) << "\n";
1271     OS << "  " << ProfileKindName
1272        << " profile base count sum: " << format("%.0f", Base.ValueCounts[I])
1273        << "\n"
1274        << "  " << ProfileKindName
1275        << " profile test count sum: " << format("%.0f", Test.ValueCounts[I])
1276        << "\n";
1277   }
1278 }
1279
1280 } // end namespace llvm