C++ GlobalVariable::getVisibility方法代码示例

GlobalVariable *
InstrProfiling::getOrCreateRegionCounters(InstrProfIncrementInst *Inc) {
  GlobalVariable *NamePtr = Inc->getName();
  auto It = ProfileDataMap.find(NamePtr);
  PerFunctionProfileData PD;
  if (It != ProfileDataMap.end()) {
    if (It->second.RegionCounters)
      return It->second.RegionCounters;
    PD = It->second;
  }

  // Move the name variable to the right section. Place them in a COMDAT group
  // if the associated function is a COMDAT. This will make sure that
  // only one copy of counters of the COMDAT function will be emitted after
  // linking.
  Function *Fn = Inc->getParent()->getParent();
  Comdat *ProfileVarsComdat = nullptr;
  ProfileVarsComdat = getOrCreateProfileComdat(*M, *Fn, Inc);

  uint64_t NumCounters = Inc->getNumCounters()->getZExtValue();
  LLVMContext &Ctx = M->getContext();
  ArrayType *CounterTy = ArrayType::get(Type::getInt64Ty(Ctx), NumCounters);

  // Create the counters variable.
  auto *CounterPtr =
      new GlobalVariable(*M, CounterTy, false, NamePtr->getLinkage(),
                         Constant::getNullValue(CounterTy),
                         getVarName(Inc, getInstrProfCountersVarPrefix()));
  CounterPtr->setVisibility(NamePtr->getVisibility());
  CounterPtr->setSection(
      getInstrProfSectionName(IPSK_cnts, TT.getObjectFormat()));
  CounterPtr->setAlignment(8);
  CounterPtr->setComdat(ProfileVarsComdat);

  auto *Int8PtrTy = Type::getInt8PtrTy(Ctx);
  // Allocate statically the array of pointers to value profile nodes for
  // the current function.
  Constant *ValuesPtrExpr = ConstantPointerNull::get(Int8PtrTy);
  if (ValueProfileStaticAlloc && !needsRuntimeRegistrationOfSectionRange(*M)) {
    uint64_t NS = 0;
    for (uint32_t Kind = IPVK_First; Kind <= IPVK_Last; ++Kind)
      NS += PD.NumValueSites[Kind];
    if (NS) {
      ArrayType *ValuesTy = ArrayType::get(Type::getInt64Ty(Ctx), NS);

      auto *ValuesVar =
          new GlobalVariable(*M, ValuesTy, false, NamePtr->getLinkage(),
                             Constant::getNullValue(ValuesTy),
                             getVarName(Inc, getInstrProfValuesVarPrefix()));
      ValuesVar->setVisibility(NamePtr->getVisibility());
      ValuesVar->setSection(
          getInstrProfSectionName(IPSK_vals, TT.getObjectFormat()));
      ValuesVar->setAlignment(8);
      ValuesVar->setComdat(ProfileVarsComdat);
      ValuesPtrExpr =
          ConstantExpr::getBitCast(ValuesVar, Type::getInt8PtrTy(Ctx));
    }
  }

  // Create data variable.
  auto *Int16Ty = Type::getInt16Ty(Ctx);
  auto *Int16ArrayTy = ArrayType::get(Int16Ty, IPVK_Last + 1);
  Type *DataTypes[] = {
#define INSTR_PROF_DATA(Type, LLVMType, Name, Init) LLVMType,
#include "llvm/ProfileData/InstrProfData.inc"
  };
  auto *DataTy = StructType::get(Ctx, makeArrayRef(DataTypes));

  Constant *FunctionAddr = shouldRecordFunctionAddr(Fn)
                               ? ConstantExpr::getBitCast(Fn, Int8PtrTy)
                               : ConstantPointerNull::get(Int8PtrTy);

  Constant *Int16ArrayVals[IPVK_Last + 1];
  for (uint32_t Kind = IPVK_First; Kind <= IPVK_Last; ++Kind)
    Int16ArrayVals[Kind] = ConstantInt::get(Int16Ty, PD.NumValueSites[Kind]);

  Constant *DataVals[] = {
#define INSTR_PROF_DATA(Type, LLVMType, Name, Init) Init,
#include "llvm/ProfileData/InstrProfData.inc"
  };
  auto *Data = new GlobalVariable(*M, DataTy, false, NamePtr->getLinkage(),
                                  ConstantStruct::get(DataTy, DataVals),
                                  getVarName(Inc, getInstrProfDataVarPrefix()));
  Data->setVisibility(NamePtr->getVisibility());
  Data->setSection(getInstrProfSectionName(IPSK_data, TT.getObjectFormat()));
  Data->setAlignment(INSTR_PROF_DATA_ALIGNMENT);
  Data->setComdat(ProfileVarsComdat);

  PD.RegionCounters = CounterPtr;
  PD.DataVar = Data;
  ProfileDataMap[NamePtr] = PD;

  // Mark the data variable as used so that it isn't stripped out.
  UsedVars.push_back(Data);
  // Now that the linkage set by the FE has been passed to the data and counter
  // variables, reset Name variable's linkage and visibility to private so that
  // it can be removed later by the compiler.
  NamePtr->setLinkage(GlobalValue::PrivateLinkage);
  // Collect the referenced names to be used by emitNameData.
  ReferencedNames.push_back(NamePtr);
//.........这里部分代码省略.........

GlobalVariable *
InstrProfiling::getOrCreateRegionCounters(InstrProfIncrementInst *Inc) {
  GlobalVariable *Name = Inc->getName();
  auto It = RegionCounters.find(Name);
  if (It != RegionCounters.end())
    return It->second;

  // Move the name variable to the right section. Place them in a COMDAT group
  // if the associated function is a COMDAT. This will make sure that
  // only one copy of counters of the COMDAT function will be emitted after
  // linking.
  Function *Fn = Inc->getParent()->getParent();
  Comdat *ProfileVarsComdat = nullptr;
  if (Fn->hasComdat())
    ProfileVarsComdat = M->getOrInsertComdat(StringRef(getVarName(Inc, "vars")));
  Name->setSection(getNameSection());
  Name->setAlignment(1);
  Name->setComdat(ProfileVarsComdat);

  uint64_t NumCounters = Inc->getNumCounters()->getZExtValue();
  LLVMContext &Ctx = M->getContext();
  ArrayType *CounterTy = ArrayType::get(Type::getInt64Ty(Ctx), NumCounters);

  // Create the counters variable.
  auto *Counters = new GlobalVariable(*M, CounterTy, false, Name->getLinkage(),
                                      Constant::getNullValue(CounterTy),
                                      getVarName(Inc, "counters"));
  Counters->setVisibility(Name->getVisibility());
  Counters->setSection(getCountersSection());
  Counters->setAlignment(8);
  Counters->setComdat(ProfileVarsComdat);

  RegionCounters[Inc->getName()] = Counters;

  // Create data variable.
  auto *NameArrayTy = Name->getType()->getPointerElementType();
  auto *Int32Ty = Type::getInt32Ty(Ctx);
  auto *Int64Ty = Type::getInt64Ty(Ctx);
  auto *Int8PtrTy = Type::getInt8PtrTy(Ctx);
  auto *Int64PtrTy = Type::getInt64PtrTy(Ctx);

  Type *DataTypes[] = {Int32Ty, Int32Ty, Int64Ty, Int8PtrTy, Int64PtrTy};
  auto *DataTy = StructType::get(Ctx, makeArrayRef(DataTypes));
  Constant *DataVals[] = {
      ConstantInt::get(Int32Ty, NameArrayTy->getArrayNumElements()),
      ConstantInt::get(Int32Ty, NumCounters),
      ConstantInt::get(Int64Ty, Inc->getHash()->getZExtValue()),
      ConstantExpr::getBitCast(Name, Int8PtrTy),
      ConstantExpr::getBitCast(Counters, Int64PtrTy)};
  auto *Data = new GlobalVariable(*M, DataTy, true, Name->getLinkage(),
                                  ConstantStruct::get(DataTy, DataVals),
                                  getVarName(Inc, "data"));
  Data->setVisibility(Name->getVisibility());
  Data->setSection(getDataSection());
  Data->setAlignment(8);
  Data->setComdat(ProfileVarsComdat);

  // Mark the data variable as used so that it isn't stripped out.
  UsedVars.push_back(Data);

  return Counters;
}

GlobalVariable *
InstrProfiling::getOrCreateRegionCounters(InstrProfIncrementInst *Inc) {
  GlobalVariable *NamePtr = Inc->getName();
  auto It = ProfileDataMap.find(NamePtr);
  PerFunctionProfileData PD;
  if (It != ProfileDataMap.end()) {
    if (It->second.RegionCounters)
      return It->second.RegionCounters;
    PD = It->second;
  }

  // Move the name variable to the right section. Place them in a COMDAT group
  // if the associated function is a COMDAT. This will make sure that
  // only one copy of counters of the COMDAT function will be emitted after
  // linking.
  Function *Fn = Inc->getParent()->getParent();
  Comdat *ProfileVarsComdat = nullptr;
  if (Fn->hasComdat())
    ProfileVarsComdat = getOrCreateProfileComdat(*M, Inc);
  NamePtr->setSection(getNameSection());
  NamePtr->setAlignment(1);
  NamePtr->setComdat(ProfileVarsComdat);

  uint64_t NumCounters = Inc->getNumCounters()->getZExtValue();
  LLVMContext &Ctx = M->getContext();
  ArrayType *CounterTy = ArrayType::get(Type::getInt64Ty(Ctx), NumCounters);

  // Create the counters variable.
  auto *CounterPtr =
      new GlobalVariable(*M, CounterTy, false, NamePtr->getLinkage(),
                         Constant::getNullValue(CounterTy),
                         getVarName(Inc, getInstrProfCountersVarPrefix()));
  CounterPtr->setVisibility(NamePtr->getVisibility());
  CounterPtr->setSection(getCountersSection());
  CounterPtr->setAlignment(8);
  CounterPtr->setComdat(ProfileVarsComdat);

  // Create data variable.
  auto *Int8PtrTy = Type::getInt8PtrTy(Ctx);
  auto *Int16Ty = Type::getInt16Ty(Ctx);
  auto *Int16ArrayTy = ArrayType::get(Int16Ty, IPVK_Last+1);
  Type *DataTypes[] = {
    #define INSTR_PROF_DATA(Type, LLVMType, Name, Init) LLVMType,
    #include "llvm/ProfileData/InstrProfData.inc"
  };
  auto *DataTy = StructType::get(Ctx, makeArrayRef(DataTypes));

  Constant *FunctionAddr = shouldRecordFunctionAddr(Fn) ?
                           ConstantExpr::getBitCast(Fn, Int8PtrTy) :
                           ConstantPointerNull::get(Int8PtrTy);

  Constant *Int16ArrayVals[IPVK_Last+1];
  for (uint32_t Kind = IPVK_First; Kind <= IPVK_Last; ++Kind)
    Int16ArrayVals[Kind] = ConstantInt::get(Int16Ty, PD.NumValueSites[Kind]);

  Constant *DataVals[] = {
    #define INSTR_PROF_DATA(Type, LLVMType, Name, Init) Init,
    #include "llvm/ProfileData/InstrProfData.inc"
  };
  auto *Data = new GlobalVariable(*M, DataTy, false, NamePtr->getLinkage(),
                                  ConstantStruct::get(DataTy, DataVals),
                                  getVarName(Inc, getInstrProfDataVarPrefix()));
  Data->setVisibility(NamePtr->getVisibility());
  Data->setSection(getDataSection());
  Data->setAlignment(INSTR_PROF_DATA_ALIGNMENT);
  Data->setComdat(ProfileVarsComdat);

  PD.RegionCounters = CounterPtr;
  PD.DataVar = Data;
  ProfileDataMap[NamePtr] = PD;

  // Mark the data variable as used so that it isn't stripped out.
  UsedVars.push_back(Data);

  return CounterPtr;
}