LCOV - code coverage report
Current view: top level - lib/ProfileData - InstrProf.cpp (source / functions) Hit Total Coverage
Test: llvm-toolchain.info Lines: 391 452 86.5 %
Date: 2017-09-14 15:23:50 Functions: 50 56 89.3 %
Legend: Lines: hit not hit

          Line data    Source code
       1             : //===- InstrProf.cpp - Instrumented profiling format support --------------===//
       2             : //
       3             : //                     The LLVM Compiler Infrastructure
       4             : //
       5             : // This file is distributed under the University of Illinois Open Source
       6             : // License. See LICENSE.TXT for details.
       7             : //
       8             : //===----------------------------------------------------------------------===//
       9             : //
      10             : // This file contains support for clang's instrumentation based PGO and
      11             : // coverage.
      12             : //
      13             : //===----------------------------------------------------------------------===//
      14             : 
      15             : #include "llvm/ProfileData/InstrProf.h"
      16             : #include "llvm/ADT/ArrayRef.h"
      17             : #include "llvm/ADT/SmallString.h"
      18             : #include "llvm/ADT/SmallVector.h"
      19             : #include "llvm/ADT/StringExtras.h"
      20             : #include "llvm/ADT/StringRef.h"
      21             : #include "llvm/ADT/Triple.h"
      22             : #include "llvm/IR/Constant.h"
      23             : #include "llvm/IR/Constants.h"
      24             : #include "llvm/IR/Function.h"
      25             : #include "llvm/IR/GlobalValue.h"
      26             : #include "llvm/IR/GlobalVariable.h"
      27             : #include "llvm/IR/Instruction.h"
      28             : #include "llvm/IR/LLVMContext.h"
      29             : #include "llvm/IR/MDBuilder.h"
      30             : #include "llvm/IR/Metadata.h"
      31             : #include "llvm/IR/Module.h"
      32             : #include "llvm/IR/Type.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       72306 : static cl::opt<bool> StaticFuncFullModulePrefix(
      59      216918 :     "static-func-full-module-prefix", cl::init(true),
      60      216918 :     cl::desc("Use full module build paths in the profile counter names for "
      61       72306 :              "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       72306 : static cl::opt<unsigned> StaticFuncStripDirNamePrefix(
      72      216918 :     "static-func-strip-dirname-prefix", cl::init(0),
      73      216918 :     cl::desc("Strip specified level of directory name from source path in "
      74       72306 :              "the profile counter name for static functions."));
      75             : 
      76          27 : static std::string getInstrProfErrString(instrprof_error Err) {
      77          27 :   switch (Err) {
      78             :   case instrprof_error::success:
      79           0 :     return "Success";
      80             :   case instrprof_error::eof:
      81           0 :     return "End of File";
      82             :   case instrprof_error::unrecognized_format:
      83           2 :     return "Unrecognized instrumentation profile encoding format";
      84             :   case instrprof_error::bad_magic:
      85           0 :     return "Invalid instrumentation profile data (bad magic)";
      86             :   case instrprof_error::bad_header:
      87           4 :     return "Invalid instrumentation profile data (file header is corrupt)";
      88             :   case instrprof_error::unsupported_version:
      89           0 :     return "Unsupported instrumentation profile format version";
      90             :   case instrprof_error::unsupported_hash_type:
      91           0 :     return "Unsupported instrumentation profile hash type";
      92             :   case instrprof_error::too_large:
      93           0 :     return "Too much profile data";
      94             :   case instrprof_error::truncated:
      95           2 :     return "Truncated profile data";
      96             :   case instrprof_error::malformed:
      97          18 :     return "Malformed instrumentation profile data";
      98             :   case instrprof_error::unknown_function:
      99          12 :     return "No profile data available for function";
     100             :   case instrprof_error::hash_mismatch:
     101          12 :     return "Function control flow change detected (hash mismatch)";
     102             :   case instrprof_error::count_mismatch:
     103           2 :     return "Function basic block count change detected (counter mismatch)";
     104             :   case instrprof_error::counter_overflow:
     105           2 :     return "Counter overflow";
     106             :   case instrprof_error::value_site_count_mismatch:
     107           0 :     return "Function value site count change detected (counter mismatch)";
     108             :   case instrprof_error::compress_failed:
     109           0 :     return "Failed to compress data (zlib)";
     110             :   case instrprof_error::uncompress_failed:
     111           0 :     return "Failed to uncompress data (zlib)";
     112             :   case instrprof_error::empty_raw_profile:
     113           0 :     return "Empty raw profile file";
     114             :   case instrprof_error::zlib_unavailable:
     115           0 :     return "Profile uses zlib compression but the profile reader was built without zlib support";
     116             :   }
     117           0 :   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           0 : class InstrProfErrorCategoryType : public std::error_category {
     126           0 :   const char *name() const noexcept override { return "llvm.instrprof"; }
     127             : 
     128           0 :   std::string message(int IE) const override {
     129           0 :     return getInstrProfErrString(static_cast<instrprof_error>(IE));
     130             :   }
     131             : };
     132             : 
     133             : } // end anonymous namespace
     134             : 
     135             : static ManagedStatic<InstrProfErrorCategoryType> ErrorCategory;
     136             : 
     137           0 : const std::error_category &llvm::instrprof_category() {
     138           0 :   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        1276 : std::string getInstrProfSectionName(InstrProfSectKind IPSK,
     166             :                                     Triple::ObjectFormatType OF,
     167             :                                     bool AddSegmentInfo) {
     168        1276 :   std::string SectName;
     169             : 
     170        1276 :   if (OF == Triple::MachO && AddSegmentInfo)
     171         186 :     SectName = InstrProfSectNamePrefix[IPSK];
     172             : 
     173        1276 :   if (OF == Triple::COFF)
     174          47 :     SectName += InstrProfSectNameCoff[IPSK];
     175             :   else
     176        1229 :     SectName += InstrProfSectNameCommon[IPSK];
     177             : 
     178        1276 :   if (OF == Triple::MachO && IPSK == IPSK_data && AddSegmentInfo)
     179             :     SectName += ",regular,live_support";
     180             : 
     181        1276 :   return SectName;
     182             : }
     183             : 
     184           0 : void SoftInstrProfErrors::addError(instrprof_error IE) {
     185           0 :   if (IE == instrprof_error::success)
     186             :     return;
     187             : 
     188           0 :   if (FirstError == instrprof_error::success)
     189           0 :     FirstError = IE;
     190             : 
     191           0 :   switch (IE) {
     192           0 :   case instrprof_error::hash_mismatch:
     193           0 :     ++NumHashMismatches;
     194           0 :     break;
     195           0 :   case instrprof_error::count_mismatch:
     196           0 :     ++NumCountMismatches;
     197           0 :     break;
     198           0 :   case instrprof_error::counter_overflow:
     199           0 :     ++NumCounterOverflows;
     200           0 :     break;
     201           0 :   case instrprof_error::value_site_count_mismatch:
     202           0 :     ++NumValueSiteCountMismatches;
     203           0 :     break;
     204           0 :   default:
     205           0 :     llvm_unreachable("Not a soft error");
     206             :   }
     207             : }
     208             : 
     209          27 : std::string InstrProfError::message() const {
     210          27 :   return getInstrProfErrString(Err);
     211             : }
     212             : 
     213             : char InstrProfError::ID = 0;
     214             : 
     215        1553 : std::string getPGOFuncName(StringRef RawFuncName,
     216             :                            GlobalValue::LinkageTypes Linkage,
     217             :                            StringRef FileName,
     218             :                            uint64_t Version LLVM_ATTRIBUTE_UNUSED) {
     219        1553 :   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           4 : static StringRef stripDirPrefix(StringRef PathNameStr, uint32_t NumPrefix) {
     226           4 :   uint32_t Count = NumPrefix;
     227           4 :   uint32_t Pos = 0, LastPos = 0;
     228         212 :   for (auto & CI : PathNameStr) {
     229         206 :     ++Pos;
     230         206 :     if (llvm::sys::path::is_separator(CI)) {
     231          16 :       LastPos = Pos;
     232          16 :       --Count;
     233             :     }
     234         206 :     if (Count == 0)
     235             :       break;
     236             :   }
     237           8 :   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        1204 : std::string getPGOFuncName(const Function &F, bool InLTO, uint64_t Version) {
     254        1204 :   if (!InLTO) {
     255             :     StringRef FileName = (StaticFuncFullModulePrefix
     256         292 :                               ? F.getParent()->getName()
     257         588 :                               : sys::path::filename(F.getParent()->getName()));
     258         586 :     if (StaticFuncFullModulePrefix && StaticFuncStripDirNamePrefix != 0)
     259           4 :       FileName = stripDirPrefix(FileName, StaticFuncStripDirNamePrefix);
     260         588 :     return getPGOFuncName(F.getName(), F.getLinkage(), FileName, Version);
     261             :   }
     262             : 
     263             :   // In LTO mode (when InLTO is true), first check if there is a meta data.
     264         910 :   if (MDNode *MD = getPGOFuncNameMetadata(F)) {
     265          14 :     StringRef S = cast<MDString>(MD->getOperand(0))->getString();
     266           7 :     return S.str();
     267             :   }
     268             : 
     269             :   // If there is no meta data, the function must be a global before the value
     270             :   // profile annotation pass. Its current linkage may be internal if it is
     271             :   // internalized in LTO mode.
     272         903 :   return getPGOFuncName(F.getName(), GlobalValue::ExternalLinkage, "");
     273             : }
     274             : 
     275         290 : StringRef getFuncNameWithoutPrefix(StringRef PGOFuncName, StringRef FileName) {
     276         290 :   if (FileName.empty())
     277           0 :     return PGOFuncName;
     278             :   // Drop the file name including ':'. See also getPGOFuncName.
     279           8 :   if (PGOFuncName.startswith(FileName))
     280          16 :     PGOFuncName = PGOFuncName.drop_front(FileName.size() + 1);
     281         290 :   return PGOFuncName;
     282             : }
     283             : 
     284             : // \p FuncName is the string used as profile lookup key for the function. A
     285             : // symbol is created to hold the name. Return the legalized symbol name.
     286         348 : std::string getPGOFuncNameVarName(StringRef FuncName,
     287             :                                   GlobalValue::LinkageTypes Linkage) {
     288         696 :   std::string VarName = getInstrProfNameVarPrefix();
     289         348 :   VarName += FuncName;
     290             : 
     291             :   if (!GlobalValue::isLocalLinkage(Linkage))
     292             :     return VarName;
     293             : 
     294             :   // Now fix up illegal chars in local VarName that may upset the assembler.
     295         257 :   const char *InvalidChars = "-:<>/\"'";
     296         257 :   size_t found = VarName.find_first_of(InvalidChars);
     297         381 :   while (found != std::string::npos) {
     298          62 :     VarName[found] = '_';
     299         124 :     found = VarName.find_first_of(InvalidChars, found + 1);
     300             :   }
     301             :   return VarName;
     302             : }
     303             : 
     304         348 : GlobalVariable *createPGOFuncNameVar(Module &M,
     305             :                                      GlobalValue::LinkageTypes Linkage,
     306             :                                      StringRef PGOFuncName) {
     307             :   // We generally want to match the function's linkage, but available_externally
     308             :   // and extern_weak both have the wrong semantics, and anything that doesn't
     309             :   // need to link across compilation units doesn't need to be visible at all.
     310         348 :   if (Linkage == GlobalValue::ExternalWeakLinkage)
     311             :     Linkage = GlobalValue::LinkOnceAnyLinkage;
     312         348 :   else if (Linkage == GlobalValue::AvailableExternallyLinkage)
     313             :     Linkage = GlobalValue::LinkOnceODRLinkage;
     314         688 :   else if (Linkage == GlobalValue::InternalLinkage ||
     315         344 :            Linkage == GlobalValue::ExternalLinkage)
     316         257 :     Linkage = GlobalValue::PrivateLinkage;
     317             : 
     318             :   auto *Value =
     319         348 :       ConstantDataArray::getString(M.getContext(), PGOFuncName, false);
     320             :   auto FuncNameVar =
     321         348 :       new GlobalVariable(M, Value->getType(), true, Linkage, Value,
     322        1392 :                          getPGOFuncNameVarName(PGOFuncName, Linkage));
     323             : 
     324             :   // Hide the symbol so that we correctly get a copy for each executable.
     325         787 :   if (!GlobalValue::isLocalLinkage(FuncNameVar->getLinkage()))
     326          91 :     FuncNameVar->setVisibility(GlobalValue::HiddenVisibility);
     327             : 
     328         348 :   return FuncNameVar;
     329             : }
     330             : 
     331          90 : GlobalVariable *createPGOFuncNameVar(Function &F, StringRef PGOFuncName) {
     332         180 :   return createPGOFuncNameVar(*F.getParent(), F.getLinkage(), PGOFuncName);
     333             : }
     334             : 
     335         483 : Error InstrProfSymtab::create(Module &M, bool InLTO) {
     336        2482 :   for (Function &F : M) {
     337             :     // Function may not have a name: like using asm("") to overwrite the name.
     338             :     // Ignore in this case.
     339        2066 :     if (!F.hasName())
     340           0 :       continue;
     341        1033 :     const std::string &PGOFuncName = getPGOFuncName(F, InLTO);
     342        3099 :     if (Error E = addFuncName(PGOFuncName))
     343           0 :       return E;
     344        3099 :     MD5FuncMap.emplace_back(Function::getGUID(PGOFuncName), &F);
     345             :     // In ThinLTO, local function may have been promoted to global and have
     346             :     // suffix added to the function name. We need to add the stripped function
     347             :     // name to the symbol table so that we can find a match from profile.
     348        1033 :     if (InLTO) {
     349         910 :       auto pos = PGOFuncName.find('.');
     350         910 :       if (pos != std::string::npos) {
     351          55 :         const std::string &OtherFuncName = PGOFuncName.substr(0, pos);
     352         165 :         if (Error E = addFuncName(OtherFuncName))
     353           0 :           return E;
     354         165 :         MD5FuncMap.emplace_back(Function::getGUID(OtherFuncName), &F);
     355             :       }
     356             :     }
     357             :   }
     358             : 
     359         483 :   finalizeSymtab();
     360        1449 :   return Error::success();
     361             : }
     362             : 
     363         146 : Error collectPGOFuncNameStrings(ArrayRef<std::string> NameStrs,
     364             :                                 bool doCompression, std::string &Result) {
     365             :   assert(!NameStrs.empty() && "No name data to emit");
     366             : 
     367         146 :   uint8_t Header[16], *P = Header;
     368             :   std::string UncompressedNameStrings =
     369         584 :       join(NameStrs.begin(), NameStrs.end(), getInstrProfNameSeparator());
     370             : 
     371             :   assert(StringRef(UncompressedNameStrings)
     372             :                  .count(getInstrProfNameSeparator()) == (NameStrs.size() - 1) &&
     373             :          "PGO name is invalid (contains separator token)");
     374             : 
     375         292 :   unsigned EncLen = encodeULEB128(UncompressedNameStrings.length(), P);
     376         146 :   P += EncLen;
     377             : 
     378         146 :   auto WriteStringToResult = [&](size_t CompressedLen, StringRef InputStr) {
     379         438 :     EncLen = encodeULEB128(CompressedLen, P);
     380         292 :     P += EncLen;
     381         146 :     char *HeaderStr = reinterpret_cast<char *>(&Header[0]);
     382         146 :     unsigned HeaderLen = P - &Header[0];
     383         146 :     Result.append(HeaderStr, HeaderLen);
     384         146 :     Result += InputStr;
     385         146 :     return Error::success();
     386         146 :   };
     387             : 
     388         146 :   if (!doCompression) {
     389          12 :     return WriteStringToResult(0, UncompressedNameStrings);
     390             :   }
     391             : 
     392         142 :   SmallString<128> CompressedNameStrings;
     393             :   Error E = zlib::compress(StringRef(UncompressedNameStrings),
     394         284 :                            CompressedNameStrings, zlib::BestSizeCompression);
     395         142 :   if (E) {
     396           0 :     consumeError(std::move(E));
     397           0 :     return make_error<InstrProfError>(instrprof_error::compress_failed);
     398             :   }
     399             : 
     400         426 :   return WriteStringToResult(CompressedNameStrings.size(),
     401         142 :                              CompressedNameStrings);
     402             : }
     403             : 
     404         684 : StringRef getPGOFuncNameVarInitializer(GlobalVariable *NameVar) {
     405        1368 :   auto *Arr = cast<ConstantDataArray>(NameVar->getInitializer());
     406             :   StringRef NameStr =
     407        1364 :       Arr->isCString() ? Arr->getAsCString() : Arr->getAsString();
     408         684 :   return NameStr;
     409             : }
     410             : 
     411         138 : Error collectPGOFuncNameStrings(ArrayRef<GlobalVariable *> NameVars,
     412             :                                 std::string &Result, bool doCompression) {
     413         276 :   std::vector<std::string> NameStrs;
     414         625 :   for (auto *NameVar : NameVars) {
     415        1396 :     NameStrs.push_back(getPGOFuncNameVarInitializer(NameVar));
     416             :   }
     417             :   return collectPGOFuncNameStrings(
     418         414 :       NameStrs, zlib::isAvailable() && doCompression, Result);
     419             : }
     420             : 
     421          44 : Error readPGOFuncNameStrings(StringRef NameStrings, InstrProfSymtab &Symtab) {
     422          44 :   const uint8_t *P = reinterpret_cast<const uint8_t *>(NameStrings.data());
     423          44 :   const uint8_t *EndP = reinterpret_cast<const uint8_t *>(NameStrings.data() +
     424          44 :                                                           NameStrings.size());
     425         111 :   while (P < EndP) {
     426             :     uint32_t N;
     427          67 :     uint64_t UncompressedSize = decodeULEB128(P, &N);
     428          67 :     P += N;
     429          67 :     uint64_t CompressedSize = decodeULEB128(P, &N);
     430          67 :     P += N;
     431          67 :     bool isCompressed = (CompressedSize != 0);
     432         134 :     SmallString<128> UncompressedNameStrings;
     433          67 :     StringRef NameStrings;
     434          67 :     if (isCompressed) {
     435           8 :       if (!llvm::zlib::isAvailable())
     436           0 :         return make_error<InstrProfError>(instrprof_error::zlib_unavailable);
     437             : 
     438             :       StringRef CompressedNameStrings(reinterpret_cast<const char *>(P),
     439           8 :                                       CompressedSize);
     440           8 :       if (Error E =
     441             :               zlib::uncompress(CompressedNameStrings, UncompressedNameStrings,
     442          24 :                                UncompressedSize)) {
     443           0 :         consumeError(std::move(E));
     444           0 :         return make_error<InstrProfError>(instrprof_error::uncompress_failed);
     445             :       }
     446           8 :       P += CompressedSize;
     447          16 :       NameStrings = StringRef(UncompressedNameStrings.data(),
     448             :                               UncompressedNameStrings.size());
     449             :     } else {
     450          59 :       NameStrings =
     451          59 :           StringRef(reinterpret_cast<const char *>(P), UncompressedSize);
     452          59 :       P += UncompressedSize;
     453             :     }
     454             :     // Now parse the name strings.
     455         134 :     SmallVector<StringRef, 0> Names;
     456          67 :     NameStrings.split(Names, getInstrProfNameSeparator());
     457         410 :     for (StringRef &Name : Names)
     458         627 :       if (Error E = Symtab.addFuncName(Name))
     459           0 :         return E;
     460             : 
     461         213 :     while (P < EndP && *P == 0)
     462          73 :       P++;
     463             :   }
     464          44 :   Symtab.finalizeSymtab();
     465         132 :   return Error::success();
     466             : }
     467             : 
     468          16 : void InstrProfValueSiteRecord::merge(InstrProfValueSiteRecord &Input,
     469             :                                      uint64_t Weight,
     470             :                                      function_ref<void(instrprof_error)> Warn) {
     471          16 :   this->sortByTargetValues();
     472          16 :   Input.sortByTargetValues();
     473          32 :   auto I = ValueData.begin();
     474          32 :   auto IE = ValueData.end();
     475          48 :   for (auto J = Input.ValueData.begin(), JE = Input.ValueData.end(); J != JE;
     476             :        ++J) {
     477        3116 :     while (I != IE && I->Value < J->Value)
     478             :       ++I;
     479        1580 :     if (I != IE && I->Value == J->Value) {
     480             :       bool Overflowed;
     481          48 :       I->Count = SaturatingMultiplyAdd(J->Count, Weight, I->Count, &Overflowed);
     482          16 :       if (Overflowed)
     483             :         Warn(instrprof_error::counter_overflow);
     484          16 :       ++I;
     485          16 :       continue;
     486             :     }
     487        1536 :     ValueData.insert(I, *J);
     488             :   }
     489          16 : }
     490             : 
     491           8 : void InstrProfValueSiteRecord::scale(uint64_t Weight,
     492             :                                      function_ref<void(instrprof_error)> Warn) {
     493          24 :   for (auto I = ValueData.begin(), IE = ValueData.end(); I != IE; ++I) {
     494             :     bool Overflowed;
     495          24 :     I->Count = SaturatingMultiply(I->Count, Weight, &Overflowed);
     496          12 :     if (Overflowed)
     497             :       Warn(instrprof_error::counter_overflow);
     498             :   }
     499           8 : }
     500             : 
     501             : // Merge Value Profile data from Src record to this record for ValueKind.
     502             : // Scale merged value counts by \p Weight.
     503         106 : void InstrProfRecord::mergeValueProfData(
     504             :     uint32_t ValueKind, InstrProfRecord &Src, uint64_t Weight,
     505             :     function_ref<void(instrprof_error)> Warn) {
     506         106 :   uint32_t ThisNumValueSites = getNumValueSites(ValueKind);
     507         106 :   uint32_t OtherNumValueSites = Src.getNumValueSites(ValueKind);
     508         106 :   if (ThisNumValueSites != OtherNumValueSites) {
     509             :     Warn(instrprof_error::value_site_count_mismatch);
     510         100 :     return;
     511             :   }
     512         106 :   if (!ThisNumValueSites)
     513             :     return;
     514             :   std::vector<InstrProfValueSiteRecord> &ThisSiteRecords =
     515           6 :       getOrCreateValueSitesForKind(ValueKind);
     516             :   MutableArrayRef<InstrProfValueSiteRecord> OtherSiteRecords =
     517           6 :       Src.getValueSitesForKind(ValueKind);
     518          22 :   for (uint32_t I = 0; I < ThisNumValueSites; I++)
     519          48 :     ThisSiteRecords[I].merge(OtherSiteRecords[I], Weight, Warn);
     520             : }
     521             : 
     522          54 : void InstrProfRecord::merge(InstrProfRecord &Other, uint64_t Weight,
     523             :                             function_ref<void(instrprof_error)> Warn) {
     524             :   // If the number of counters doesn't match we either have bad data
     525             :   // or a hash collision.
     526         162 :   if (Counts.size() != Other.Counts.size()) {
     527             :     Warn(instrprof_error::count_mismatch);
     528             :     return;
     529             :   }
     530             : 
     531         671 :   for (size_t I = 0, E = Other.Counts.size(); I < E; ++I) {
     532             :     bool Overflowed;
     533         618 :     Counts[I] =
     534        1236 :         SaturatingMultiplyAdd(Other.Counts[I], Weight, Counts[I], &Overflowed);
     535         309 :     if (Overflowed)
     536             :       Warn(instrprof_error::counter_overflow);
     537             :   }
     538             : 
     539         265 :   for (uint32_t Kind = IPVK_First; Kind <= IPVK_Last; ++Kind)
     540         106 :     mergeValueProfData(Kind, Other, Weight, Warn);
     541             : }
     542             : 
     543          20 : void InstrProfRecord::scaleValueProfData(
     544             :     uint32_t ValueKind, uint64_t Weight,
     545             :     function_ref<void(instrprof_error)> Warn) {
     546          68 :   for (auto &R : getValueSitesForKind(ValueKind))
     547           8 :     R.scale(Weight, Warn);
     548          20 : }
     549             : 
     550          10 : void InstrProfRecord::scale(uint64_t Weight,
     551             :                             function_ref<void(instrprof_error)> Warn) {
     552         119 :   for (auto &Count : this->Counts) {
     553             :     bool Overflowed;
     554          79 :     Count = SaturatingMultiply(Count, Weight, &Overflowed);
     555          79 :     if (Overflowed)
     556             :       Warn(instrprof_error::counter_overflow);
     557             :   }
     558          50 :   for (uint32_t Kind = IPVK_First; Kind <= IPVK_Last; ++Kind)
     559          20 :     scaleValueProfData(Kind, Weight, Warn);
     560          10 : }
     561             : 
     562             : // Map indirect call target name hash to name string.
     563        1944 : uint64_t InstrProfRecord::remapValue(uint64_t Value, uint32_t ValueKind,
     564             :                                      ValueMapType *ValueMap) {
     565        1944 :   if (!ValueMap)
     566             :     return Value;
     567          28 :   switch (ValueKind) {
     568          28 :   case IPVK_IndirectCallTarget: {
     569             :     auto Result =
     570             :         std::lower_bound(ValueMap->begin(), ValueMap->end(), Value,
     571             :                          [](const std::pair<uint64_t, uint64_t> &LHS,
     572          84 :                             uint64_t RHS) { return LHS.first < RHS; });
     573             :    // Raw function pointer collected by value profiler may be from 
     574             :    // external functions that are not instrumented. They won't have
     575             :    // mapping data to be used by the deserializer. Force the value to
     576             :    // be 0 in this case.
     577          56 :     if (Result != ValueMap->end() && Result->first == Value)
     578          22 :       Value = (uint64_t)Result->second;
     579             :     else
     580             :       Value = 0;
     581             :     break;
     582             :   }
     583             :   }
     584             :   return Value;
     585             : }
     586             : 
     587         187 : void InstrProfRecord::addValueData(uint32_t ValueKind, uint32_t Site,
     588             :                                    InstrProfValueData *VData, uint32_t N,
     589             :                                    ValueMapType *ValueMap) {
     590        2131 :   for (uint32_t I = 0; I < N; I++) {
     591        1944 :     VData[I].Value = remapValue(VData[I].Value, ValueKind, ValueMap);
     592             :   }
     593             :   std::vector<InstrProfValueSiteRecord> &ValueSites =
     594         187 :       getOrCreateValueSitesForKind(ValueKind);
     595         187 :   if (N == 0)
     596          47 :     ValueSites.emplace_back();
     597             :   else
     598         140 :     ValueSites.emplace_back(VData, VData + N);
     599         187 : }
     600             : 
     601             : #define INSTR_PROF_COMMON_API_IMPL
     602             : #include "llvm/ProfileData/InstrProfData.inc"
     603             : 
     604             : /*!
     605             :  * \brief ValueProfRecordClosure Interface implementation for  InstrProfRecord
     606             :  *  class. These C wrappers are used as adaptors so that C++ code can be
     607             :  *  invoked as callbacks.
     608             :  */
     609         338 : uint32_t getNumValueKindsInstrProf(const void *Record) {
     610         338 :   return reinterpret_cast<const InstrProfRecord *>(Record)->getNumValueKinds();
     611             : }
     612             : 
     613        2020 : uint32_t getNumValueSitesInstrProf(const void *Record, uint32_t VKind) {
     614             :   return reinterpret_cast<const InstrProfRecord *>(Record)
     615        2020 :       ->getNumValueSites(VKind);
     616             : }
     617             : 
     618          42 : uint32_t getNumValueDataInstrProf(const void *Record, uint32_t VKind) {
     619             :   return reinterpret_cast<const InstrProfRecord *>(Record)
     620          42 :       ->getNumValueData(VKind);
     621             : }
     622             : 
     623          71 : uint32_t getNumValueDataForSiteInstrProf(const void *R, uint32_t VK,
     624             :                                          uint32_t S) {
     625             :   return reinterpret_cast<const InstrProfRecord *>(R)
     626          71 :       ->getNumValueDataForSite(VK, S);
     627             : }
     628             : 
     629          71 : void getValueForSiteInstrProf(const void *R, InstrProfValueData *Dst,
     630             :                               uint32_t K, uint32_t S) {
     631          71 :   reinterpret_cast<const InstrProfRecord *>(R)->getValueForSite(Dst, K, S);
     632          71 : }
     633             : 
     634         338 : ValueProfData *allocValueProfDataInstrProf(size_t TotalSizeInBytes) {
     635             :   ValueProfData *VD =
     636         338 :       (ValueProfData *)(new (::operator new(TotalSizeInBytes)) ValueProfData());
     637         338 :   memset(VD, 0, TotalSizeInBytes);
     638         338 :   return VD;
     639             : }
     640             : 
     641             : static ValueProfRecordClosure InstrProfRecordClosure = {
     642             :     nullptr,
     643             :     getNumValueKindsInstrProf,
     644             :     getNumValueSitesInstrProf,
     645             :     getNumValueDataInstrProf,
     646             :     getNumValueDataForSiteInstrProf,
     647             :     nullptr,
     648             :     getValueForSiteInstrProf,
     649             :     allocValueProfDataInstrProf};
     650             : 
     651             : // Wrapper implementation using the closure mechanism.
     652         334 : uint32_t ValueProfData::getSize(const InstrProfRecord &Record) {
     653         334 :   auto Closure = InstrProfRecordClosure;
     654         334 :   Closure.Record = &Record;
     655         334 :   return getValueProfDataSize(&Closure);
     656             : }
     657             : 
     658             : // Wrapper implementation using the closure mechanism.
     659             : std::unique_ptr<ValueProfData>
     660         338 : ValueProfData::serializeFrom(const InstrProfRecord &Record) {
     661         338 :   InstrProfRecordClosure.Record = &Record;
     662             : 
     663             :   std::unique_ptr<ValueProfData> VPD(
     664         676 :       serializeValueProfDataFrom(&InstrProfRecordClosure, nullptr));
     665         338 :   return VPD;
     666             : }
     667             : 
     668          27 : void ValueProfRecord::deserializeTo(InstrProfRecord &Record,
     669             :                                     InstrProfRecord::ValueMapType *VMap) {
     670          27 :   Record.reserveSites(Kind, NumValueSites);
     671             : 
     672          27 :   InstrProfValueData *ValueData = getValueProfRecordValueData(this);
     673         102 :   for (uint64_t VSite = 0; VSite < NumValueSites; ++VSite) {
     674          75 :     uint8_t ValueDataCount = this->SiteCountArray[VSite];
     675          75 :     Record.addValueData(Kind, VSite, ValueData, ValueDataCount, VMap);
     676          75 :     ValueData += ValueDataCount;
     677             :   }
     678          27 : }
     679             : 
     680             : // For writing/serializing,  Old is the host endianness, and  New is
     681             : // byte order intended on disk. For Reading/deserialization, Old
     682             : // is the on-disk source endianness, and New is the host endianness.
     683           4 : void ValueProfRecord::swapBytes(support::endianness Old,
     684             :                                 support::endianness New) {
     685             :   using namespace support;
     686             : 
     687           4 :   if (Old == New)
     688             :     return;
     689             : 
     690           4 :   if (getHostEndianness() != Old) {
     691           4 :     sys::swapByteOrder<uint32_t>(NumValueSites);
     692           2 :     sys::swapByteOrder<uint32_t>(Kind);
     693             :   }
     694           4 :   uint32_t ND = getValueProfRecordNumValueData(this);
     695           4 :   InstrProfValueData *VD = getValueProfRecordValueData(this);
     696             : 
     697             :   // No need to swap byte array: SiteCountArrray.
     698          28 :   for (uint32_t I = 0; I < ND; I++) {
     699          48 :     sys::swapByteOrder<uint64_t>(VD[I].Value);
     700          48 :     sys::swapByteOrder<uint64_t>(VD[I].Count);
     701             :   }
     702           4 :   if (getHostEndianness() == Old) {
     703           4 :     sys::swapByteOrder<uint32_t>(NumValueSites);
     704           2 :     sys::swapByteOrder<uint32_t>(Kind);
     705             :   }
     706             : }
     707             : 
     708         495 : void ValueProfData::deserializeTo(InstrProfRecord &Record,
     709             :                                   InstrProfRecord::ValueMapType *VMap) {
     710         495 :   if (NumValueKinds == 0)
     711             :     return;
     712             : 
     713          26 :   ValueProfRecord *VR = getFirstValueProfRecord(this);
     714          53 :   for (uint32_t K = 0; K < NumValueKinds; K++) {
     715          27 :     VR->deserializeTo(Record, VMap);
     716          27 :     VR = getValueProfRecordNext(VR);
     717             :   }
     718             : }
     719             : 
     720             : template <class T>
     721             : static T swapToHostOrder(const unsigned char *&D, support::endianness Orig) {
     722             :   using namespace support;
     723             : 
     724         491 :   if (Orig == little)
     725         489 :     return endian::readNext<T, little, unaligned>(D);
     726             :   else
     727           2 :     return endian::readNext<T, big, unaligned>(D);
     728             : }
     729             : 
     730             : static std::unique_ptr<ValueProfData> allocValueProfData(uint32_t TotalSize) {
     731         491 :   return std::unique_ptr<ValueProfData>(new (::operator new(TotalSize))
     732         982 :                                             ValueProfData());
     733             : }
     734             : 
     735         491 : Error ValueProfData::checkIntegrity() {
     736         491 :   if (NumValueKinds > IPVK_Last + 1)
     737           0 :     return make_error<InstrProfError>(instrprof_error::malformed);
     738             :   // Total size needs to be mulltiple of quadword size.
     739         491 :   if (TotalSize % sizeof(uint64_t))
     740           0 :     return make_error<InstrProfError>(instrprof_error::malformed);
     741             : 
     742         491 :   ValueProfRecord *VR = getFirstValueProfRecord(this);
     743         514 :   for (uint32_t K = 0; K < this->NumValueKinds; K++) {
     744          23 :     if (VR->Kind > IPVK_Last)
     745           0 :       return make_error<InstrProfError>(instrprof_error::malformed);
     746          23 :     VR = getValueProfRecordNext(VR);
     747          23 :     if ((char *)VR - (char *)this > (ptrdiff_t)TotalSize)
     748           0 :       return make_error<InstrProfError>(instrprof_error::malformed);
     749             :   }
     750        1473 :   return Error::success();
     751             : }
     752             : 
     753             : Expected<std::unique_ptr<ValueProfData>>
     754         491 : ValueProfData::getValueProfData(const unsigned char *D,
     755             :                                 const unsigned char *const BufferEnd,
     756             :                                 support::endianness Endianness) {
     757             :   using namespace support;
     758             : 
     759         491 :   if (D + sizeof(ValueProfData) > BufferEnd)
     760           0 :     return make_error<InstrProfError>(instrprof_error::truncated);
     761             : 
     762         491 :   const unsigned char *Header = D;
     763         491 :   uint32_t TotalSize = swapToHostOrder<uint32_t>(Header, Endianness);
     764         491 :   if (D + TotalSize > BufferEnd)
     765           0 :     return make_error<InstrProfError>(instrprof_error::too_large);
     766             : 
     767         491 :   std::unique_ptr<ValueProfData> VPD = allocValueProfData(TotalSize);
     768         982 :   memcpy(VPD.get(), D, TotalSize);
     769             :   // Byte swap.
     770         491 :   VPD->swapBytesToHost(Endianness);
     771             : 
     772         982 :   Error E = VPD->checkIntegrity();
     773         491 :   if (E)
     774           0 :     return std::move(E);
     775             : 
     776         491 :   return std::move(VPD);
     777             : }
     778             : 
     779         491 : void ValueProfData::swapBytesToHost(support::endianness Endianness) {
     780             :   using namespace support;
     781             : 
     782         491 :   if (Endianness == getHostEndianness())
     783             :     return;
     784             : 
     785           4 :   sys::swapByteOrder<uint32_t>(TotalSize);
     786           4 :   sys::swapByteOrder<uint32_t>(NumValueKinds);
     787             : 
     788           2 :   ValueProfRecord *VR = getFirstValueProfRecord(this);
     789           4 :   for (uint32_t K = 0; K < NumValueKinds; K++) {
     790           2 :     VR->swapBytes(Endianness, getHostEndianness());
     791           2 :     VR = getValueProfRecordNext(VR);
     792             :   }
     793             : }
     794             : 
     795         334 : void ValueProfData::swapBytesFromHost(support::endianness Endianness) {
     796             :   using namespace support;
     797             : 
     798         334 :   if (Endianness == getHostEndianness())
     799             :     return;
     800             : 
     801           8 :   ValueProfRecord *VR = getFirstValueProfRecord(this);
     802          10 :   for (uint32_t K = 0; K < NumValueKinds; K++) {
     803           2 :     ValueProfRecord *NVR = getValueProfRecordNext(VR);
     804           2 :     VR->swapBytes(getHostEndianness(), Endianness);
     805           2 :     VR = NVR;
     806             :   }
     807          16 :   sys::swapByteOrder<uint32_t>(TotalSize);
     808           8 :   sys::swapByteOrder<uint32_t>(NumValueKinds);
     809             : }
     810             : 
     811          10 : void annotateValueSite(Module &M, Instruction &Inst,
     812             :                        const InstrProfRecord &InstrProfR,
     813             :                        InstrProfValueKind ValueKind, uint32_t SiteIdx,
     814             :                        uint32_t MaxMDCount) {
     815          10 :   uint32_t NV = InstrProfR.getNumValueDataForSite(ValueKind, SiteIdx);
     816          10 :   if (!NV)
     817           0 :     return;
     818             : 
     819          10 :   uint64_t Sum = 0;
     820             :   std::unique_ptr<InstrProfValueData[]> VD =
     821          20 :       InstrProfR.getValueForSite(ValueKind, SiteIdx, &Sum);
     822             : 
     823          30 :   ArrayRef<InstrProfValueData> VDs(VD.get(), NV);
     824          10 :   annotateValueSite(M, Inst, VDs, Sum, ValueKind, MaxMDCount);
     825             : }
     826             : 
     827          36 : void annotateValueSite(Module &M, Instruction &Inst,
     828             :                        ArrayRef<InstrProfValueData> VDs,
     829             :                        uint64_t Sum, InstrProfValueKind ValueKind,
     830             :                        uint32_t MaxMDCount) {
     831          36 :   LLVMContext &Ctx = M.getContext();
     832          36 :   MDBuilder MDHelper(Ctx);
     833          72 :   SmallVector<Metadata *, 3> Vals;
     834             :   // Tag
     835          36 :   Vals.push_back(MDHelper.createString("VP"));
     836             :   // Value Kind
     837          36 :   Vals.push_back(MDHelper.createConstant(
     838          36 :       ConstantInt::get(Type::getInt32Ty(Ctx), ValueKind)));
     839             :   // Total Count
     840          36 :   Vals.push_back(
     841          72 :       MDHelper.createConstant(ConstantInt::get(Type::getInt64Ty(Ctx), Sum)));
     842             : 
     843             :   // Value Profile Data
     844          36 :   uint32_t MDCount = MaxMDCount;
     845         157 :   for (auto &VD : VDs) {
     846         111 :     Vals.push_back(MDHelper.createConstant(
     847         111 :         ConstantInt::get(Type::getInt64Ty(Ctx), VD.Value)));
     848         111 :     Vals.push_back(MDHelper.createConstant(
     849         111 :         ConstantInt::get(Type::getInt64Ty(Ctx), VD.Count)));
     850         111 :     if (--MDCount == 0)
     851             :       break;
     852             :   }
     853          72 :   Inst.setMetadata(LLVMContext::MD_prof, MDNode::get(Ctx, Vals));
     854          36 : }
     855             : 
     856         602 : bool getValueProfDataFromInst(const Instruction &Inst,
     857             :                               InstrProfValueKind ValueKind,
     858             :                               uint32_t MaxNumValueData,
     859             :                               InstrProfValueData ValueData[],
     860             :                               uint32_t &ActualNumValueData, uint64_t &TotalC) {
     861         572 :   MDNode *MD = Inst.getMetadata(LLVMContext::MD_prof);
     862         572 :   if (!MD)
     863             :     return false;
     864             : 
     865          58 :   unsigned NOps = MD->getNumOperands();
     866             : 
     867          58 :   if (NOps < 5)
     868             :     return false;
     869             : 
     870             :   // Operand 0 is a string tag "VP":
     871         116 :   MDString *Tag = cast<MDString>(MD->getOperand(0));
     872          58 :   if (!Tag)
     873             :     return false;
     874             : 
     875          58 :   if (!Tag->getString().equals("VP"))
     876             :     return false;
     877             : 
     878             :   // Now check kind:
     879         116 :   ConstantInt *KindInt = mdconst::dyn_extract<ConstantInt>(MD->getOperand(1));
     880             :   if (!KindInt)
     881             :     return false;
     882          58 :   if (KindInt->getZExtValue() != ValueKind)
     883             :     return false;
     884             : 
     885             :   // Get total count
     886         116 :   ConstantInt *TotalCInt = mdconst::dyn_extract<ConstantInt>(MD->getOperand(2));
     887             :   if (!TotalCInt)
     888             :     return false;
     889          58 :   TotalC = TotalCInt->getZExtValue();
     890             : 
     891          58 :   ActualNumValueData = 0;
     892             : 
     893         195 :   for (unsigned I = 3; I < NOps; I += 2) {
     894         152 :     if (ActualNumValueData >= MaxNumValueData)
     895             :       break;
     896         274 :     ConstantInt *Value = mdconst::dyn_extract<ConstantInt>(MD->getOperand(I));
     897             :     ConstantInt *Count =
     898         411 :         mdconst::dyn_extract<ConstantInt>(MD->getOperand(I + 1));
     899         137 :     if (!Value || !Count)
     900             :       return false;
     901         274 :     ValueData[ActualNumValueData].Value = Value->getZExtValue();
     902         274 :     ValueData[ActualNumValueData].Count = Count->getZExtValue();
     903         137 :     ActualNumValueData++;
     904             :   }
     905             :   return true;
     906             : }
     907             : 
     908         942 : MDNode *getPGOFuncNameMetadata(const Function &F) {
     909        1884 :   return F.getMetadata(getPGOFuncNameMetadataName());
     910             : }
     911             : 
     912         391 : void createPGOFuncNameMetadata(Function &F, StringRef PGOFuncName) {
     913             :   // Only for internal linkage functions.
     914         391 :   if (PGOFuncName == F.getName())
     915             :       return;
     916             :   // Don't create duplicated meta-data.
     917          32 :   if (getPGOFuncNameMetadata(F))
     918             :     return;
     919          32 :   LLVMContext &C = F.getContext();
     920          64 :   MDNode *N = MDNode::get(C, MDString::get(C, PGOFuncName));
     921          64 :   F.setMetadata(getPGOFuncNameMetadataName(), N);
     922             : }
     923             : 
     924         416 : bool needsComdatForCounter(const Function &F, const Module &M) {
     925         832 :   if (F.hasComdat())
     926             :     return true;
     927             : 
     928         664 :   Triple TT(M.getTargetTriple());
     929         422 :   if (!TT.isOSBinFormatELF() && !TT.isOSBinFormatWasm())
     930             :     return false;
     931             : 
     932             :   // See createPGOFuncNameVar for more details. To avoid link errors, profile
     933             :   // counters for function with available_externally linkage needs to be changed
     934             :   // to linkonce linkage. On ELF based systems, this leads to weak symbols to be
     935             :   // created. Without using comdat, duplicate entries won't be removed by the
     936             :   // linker leading to increased data segement size and raw profile size. Even
     937             :   // worse, since the referenced counter from profile per-function data object
     938             :   // will be resolved to the common strong definition, the profile counts for
     939             :   // available_externally functions will end up being duplicated in raw profile
     940             :   // data. This can result in distorted profile as the counts of those dups
     941             :   // will be accumulated by the profile merger.
     942         484 :   GlobalValue::LinkageTypes Linkage = F.getLinkage();
     943         484 :   if (Linkage != GlobalValue::ExternalWeakLinkage &&
     944         242 :       Linkage != GlobalValue::AvailableExternallyLinkage)
     945             :     return false;
     946             : 
     947           4 :   return true;
     948             : }
     949             : 
     950             : // Check if INSTR_PROF_RAW_VERSION_VAR is defined.
     951         743 : bool isIRPGOFlagSet(const Module *M) {
     952             :   auto IRInstrVar =
     953        1486 :       M->getNamedGlobal(INSTR_PROF_QUOTE(INSTR_PROF_RAW_VERSION_VAR));
     954         743 :   if (!IRInstrVar || IRInstrVar->isDeclaration() ||
     955         114 :       IRInstrVar->hasLocalLinkage())
     956             :     return false;
     957             : 
     958             :   // Check if the flag is set.
     959          57 :   if (!IRInstrVar->hasInitializer())
     960             :     return false;
     961             : 
     962          57 :   const Constant *InitVal = IRInstrVar->getInitializer();
     963          57 :   if (!InitVal)
     964             :     return false;
     965             : 
     966         114 :   return (dyn_cast<ConstantInt>(InitVal)->getZExtValue() &
     967          57 :           VARIANT_MASK_IR_PROF) != 0;
     968             : }
     969             : 
     970             : // Check if we can safely rename this Comdat function.
     971          81 : bool canRenameComdatFunc(const Function &F, bool CheckAddressTaken) {
     972         162 :   if (F.getName().empty())
     973             :     return false;
     974          81 :   if (!needsComdatForCounter(F, *(F.getParent())))
     975             :     return false;
     976             :   // Unsafe to rename the address-taken function (which can be used in
     977             :   // function comparison).
     978          31 :   if (CheckAddressTaken && F.hasAddressTaken())
     979             :     return false;
     980             :   // Only safe to do if this function may be discarded if it is not used
     981             :   // in the compilation unit.
     982          62 :   if (!GlobalValue::isDiscardableIfUnused(F.getLinkage()))
     983             :     return false;
     984             : 
     985             :   // For AvailableExternallyLinkage functions.
     986          54 :   if (!F.hasComdat()) {
     987             :     assert(F.getLinkage() == GlobalValue::AvailableExternallyLinkage);
     988             :     return true;
     989             :   }
     990             :   return true;
     991             : }
     992             : 
     993             : // Parse the value profile options.
     994       33307 : void getMemOPSizeRangeFromOption(StringRef MemOPSizeRange, int64_t &RangeStart,
     995             :                                  int64_t &RangeLast) {
     996             :   static const int64_t DefaultMemOPSizeRangeStart = 0;
     997             :   static const int64_t DefaultMemOPSizeRangeLast = 8;
     998       33307 :   RangeStart = DefaultMemOPSizeRangeStart;
     999       33307 :   RangeLast = DefaultMemOPSizeRangeLast;
    1000             : 
    1001       33307 :   if (!MemOPSizeRange.empty()) {
    1002           0 :     auto Pos = MemOPSizeRange.find(':');
    1003           0 :     if (Pos != std::string::npos) {
    1004           0 :       if (Pos > 0)
    1005           0 :         MemOPSizeRange.substr(0, Pos).getAsInteger(10, RangeStart);
    1006           0 :       if (Pos < MemOPSizeRange.size() - 1)
    1007           0 :         MemOPSizeRange.substr(Pos + 1).getAsInteger(10, RangeLast);
    1008             :     } else
    1009             :       MemOPSizeRange.getAsInteger(10, RangeLast);
    1010             :   }
    1011             :   assert(RangeLast >= RangeStart);
    1012       33307 : }
    1013             : 
    1014      216918 : } // end namespace llvm

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