//
//===----------------------------------------------------------------------===//
+#include "llvm/IR/Constants.h"
+#include "llvm/IR/Function.h"
+#include "llvm/IR/Module.h"
+#include "llvm/IR/GlobalVariable.h"
#include "llvm/ProfileData/InstrProf.h"
#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/ManagedStatic.h"
using namespace llvm;
namespace {
-class InstrProfErrorCategoryType : public error_category {
- const char *name() const override { return "llvm.instrprof"; }
+class InstrProfErrorCategoryType : public std::error_category {
+ const char *name() const LLVM_NOEXCEPT override { return "llvm.instrprof"; }
std::string message(int IE) const override {
- instrprof_error::ErrorType E = static_cast<instrprof_error::ErrorType>(IE);
+ instrprof_error E = static_cast<instrprof_error>(IE);
switch (E) {
case instrprof_error::success:
return "Success";
case instrprof_error::eof:
return "End of File";
+ case instrprof_error::unrecognized_format:
+ return "Unrecognized instrumentation profile encoding format";
case instrprof_error::bad_magic:
- return "Invalid file format (bad magic)";
+ return "Invalid instrumentation profile data (bad magic)";
case instrprof_error::bad_header:
- return "Invalid header";
+ return "Invalid instrumentation profile data (file header is corrupt)";
case instrprof_error::unsupported_version:
- return "Unsupported format version";
+ return "Unsupported instrumentation profile format version";
case instrprof_error::unsupported_hash_type:
- return "Unsupported hash function";
+ return "Unsupported instrumentation profile hash type";
case instrprof_error::too_large:
return "Too much profile data";
case instrprof_error::truncated:
return "Truncated profile data";
case instrprof_error::malformed:
- return "Malformed profile data";
+ return "Malformed instrumentation profile data";
case instrprof_error::unknown_function:
return "No profile data available for function";
case instrprof_error::hash_mismatch:
- return "Function hash mismatch";
+ return "Function control flow change detected (hash mismatch)";
case instrprof_error::count_mismatch:
- return "Function count mismatch";
+ return "Function basic block count change detected (counter mismatch)";
case instrprof_error::counter_overflow:
return "Counter overflow";
+ case instrprof_error::value_site_count_mismatch:
+ return "Function value site count change detected (counter mismatch)";
}
llvm_unreachable("A value of instrprof_error has no message.");
}
- error_condition default_error_condition(int EV) const {
- if (EV == instrprof_error::success)
- return errc::success;
- return errc::invalid_argument;
- }
};
}
-const error_category &llvm::instrprof_category() {
- static InstrProfErrorCategoryType C;
- return C;
+static ManagedStatic<InstrProfErrorCategoryType> ErrorCategory;
+
+const std::error_category &llvm::instrprof_category() {
+ return *ErrorCategory;
+}
+
+namespace llvm {
+
+std::string getPGOFuncName(StringRef RawFuncName,
+ GlobalValue::LinkageTypes Linkage,
+ StringRef FileName) {
+
+ // Function names may be prefixed with a binary '1' to indicate
+ // that the backend should not modify the symbols due to any platform
+ // naming convention. Do not include that '1' in the PGO profile name.
+ if (RawFuncName[0] == '\1')
+ RawFuncName = RawFuncName.substr(1);
+
+ std::string FuncName = RawFuncName;
+ if (llvm::GlobalValue::isLocalLinkage(Linkage)) {
+ // For local symbols, prepend the main file name to distinguish them.
+ // Do not include the full path in the file name since there's no guarantee
+ // that it will stay the same, e.g., if the files are checked out from
+ // version control in different locations.
+ if (FileName.empty())
+ FuncName = FuncName.insert(0, "<unknown>:");
+ else
+ FuncName = FuncName.insert(0, FileName.str() + ":");
+ }
+ return FuncName;
+}
+
+std::string getPGOFuncName(const Function &F) {
+ return getPGOFuncName(F.getName(), F.getLinkage(), F.getParent()->getName());
+}
+
+GlobalVariable *createPGOFuncNameVar(Module &M,
+ GlobalValue::LinkageTypes Linkage,
+ StringRef FuncName) {
+
+ // We generally want to match the function's linkage, but available_externally
+ // and extern_weak both have the wrong semantics, and anything that doesn't
+ // need to link across compilation units doesn't need to be visible at all.
+ if (Linkage == GlobalValue::ExternalWeakLinkage)
+ Linkage = GlobalValue::LinkOnceAnyLinkage;
+ else if (Linkage == GlobalValue::AvailableExternallyLinkage)
+ Linkage = GlobalValue::LinkOnceODRLinkage;
+ else if (Linkage == GlobalValue::InternalLinkage ||
+ Linkage == GlobalValue::ExternalLinkage)
+ Linkage = GlobalValue::PrivateLinkage;
+
+ auto *Value = ConstantDataArray::getString(M.getContext(), FuncName, false);
+ auto FuncNameVar =
+ new GlobalVariable(M, Value->getType(), true, Linkage, Value,
+ Twine(getInstrProfNameVarPrefix()) + FuncName);
+
+ // Hide the symbol so that we correctly get a copy for each executable.
+ if (!GlobalValue::isLocalLinkage(FuncNameVar->getLinkage()))
+ FuncNameVar->setVisibility(GlobalValue::HiddenVisibility);
+
+ return FuncNameVar;
+}
+
+GlobalVariable *createPGOFuncNameVar(Function &F, StringRef FuncName) {
+ return createPGOFuncNameVar(*F.getParent(), F.getLinkage(), FuncName);
+}
+
+uint64_t stringToHash(uint32_t ValueKind, uint64_t Value) {
+ switch (ValueKind) {
+ case IPVK_IndirectCallTarget:
+ return IndexedInstrProf::ComputeHash(IndexedInstrProf::HashType,
+ (const char *)Value);
+ break;
+ default:
+ llvm_unreachable("value kind not handled !");
+ }
+ return Value;
+}
+
+void ValueProfRecord::deserializeTo(InstrProfRecord &Record,
+ InstrProfRecord::ValueMapType *VMap) {
+ Record.reserveSites(Kind, NumValueSites);
+
+ InstrProfValueData *ValueData = getValueProfRecordValueData(this);
+ for (uint64_t VSite = 0; VSite < NumValueSites; ++VSite) {
+ uint8_t ValueDataCount = this->SiteCountArray[VSite];
+ Record.addValueData(Kind, VSite, ValueData, ValueDataCount, VMap);
+ ValueData += ValueDataCount;
+ }
+}
+
+void ValueProfRecord::serializeFrom(const InstrProfRecord &Record,
+ uint32_t ValueKind,
+ uint32_t NumValueSites) {
+ Kind = ValueKind;
+ this->NumValueSites = NumValueSites;
+ InstrProfValueData *DstVD = getValueProfRecordValueData(this);
+ for (uint32_t S = 0; S < NumValueSites; S++) {
+ uint32_t ND = Record.getNumValueDataForSite(ValueKind, S);
+ SiteCountArray[S] = ND;
+ Record.getValueForSite(DstVD, ValueKind, S, stringToHash);
+ DstVD += ND;
+ }
+}
+
+template <class T>
+static T swapToHostOrder(const unsigned char *&D, support::endianness Orig) {
+ using namespace support;
+ if (Orig == little)
+ return endian::readNext<T, little, unaligned>(D);
+ else
+ return endian::readNext<T, big, unaligned>(D);
+}
+
+// For writing/serializing, Old is the host endianness, and New is
+// byte order intended on disk. For Reading/deserialization, Old
+// is the on-disk source endianness, and New is the host endianness.
+void ValueProfRecord::swapBytes(support::endianness Old,
+ support::endianness New) {
+ using namespace support;
+ if (Old == New)
+ return;
+
+ if (getHostEndianness() != Old) {
+ sys::swapByteOrder<uint32_t>(NumValueSites);
+ sys::swapByteOrder<uint32_t>(Kind);
+ }
+ uint32_t ND = getValueProfRecordNumValueData(this);
+ InstrProfValueData *VD = getValueProfRecordValueData(this);
+
+ // No need to swap byte array: SiteCountArrray.
+ for (uint32_t I = 0; I < ND; I++) {
+ sys::swapByteOrder<uint64_t>(VD[I].Value);
+ sys::swapByteOrder<uint64_t>(VD[I].Count);
+ }
+ if (getHostEndianness() == Old) {
+ sys::swapByteOrder<uint32_t>(NumValueSites);
+ sys::swapByteOrder<uint32_t>(Kind);
+ }
+}
+
+uint32_t ValueProfData::getSize(const InstrProfRecord &Record) {
+ uint32_t TotalSize = sizeof(ValueProfData);
+ uint32_t NumValueKinds = Record.getNumValueKinds();
+ if (NumValueKinds == 0)
+ return TotalSize;
+
+ for (uint32_t Kind = IPVK_First; Kind <= IPVK_Last; Kind++) {
+ uint32_t NumValueSites = Record.getNumValueSites(Kind);
+ if (!NumValueSites)
+ continue;
+ TotalSize +=
+ getValueProfRecordSize(NumValueSites, Record.getNumValueData(Kind));
+ }
+ return TotalSize;
+}
+
+void ValueProfData::deserializeTo(InstrProfRecord &Record,
+ InstrProfRecord::ValueMapType *VMap) {
+ if (NumValueKinds == 0)
+ return;
+
+ ValueProfRecord *VR = getFirstValueProfRecord();
+ for (uint32_t K = 0; K < NumValueKinds; K++) {
+ VR->deserializeTo(Record, VMap);
+ VR = getValueProfRecordNext(VR);
+ }
+}
+
+static std::unique_ptr<ValueProfData> AllocValueProfData(uint32_t TotalSize) {
+ return std::unique_ptr<ValueProfData>(new (::operator new(TotalSize))
+ ValueProfData());
+}
+
+std::unique_ptr<ValueProfData>
+ValueProfData::serializeFrom(const InstrProfRecord &Record) {
+ uint32_t TotalSize = getSize(Record);
+
+ std::unique_ptr<ValueProfData> VPD = AllocValueProfData(TotalSize);
+
+ VPD->TotalSize = TotalSize;
+ VPD->NumValueKinds = Record.getNumValueKinds();
+ ValueProfRecord *VR = VPD->getFirstValueProfRecord();
+ for (uint32_t Kind = IPVK_First; Kind <= IPVK_Last; Kind++) {
+ uint32_t NumValueSites = Record.getNumValueSites(Kind);
+ if (!NumValueSites)
+ continue;
+ VR->serializeFrom(Record, Kind, NumValueSites);
+ VR = getValueProfRecordNext(VR);
+ }
+ return VPD;
+}
+
+ErrorOr<std::unique_ptr<ValueProfData>>
+ValueProfData::getValueProfData(const unsigned char *D,
+ const unsigned char *const BufferEnd,
+ support::endianness Endianness) {
+ using namespace support;
+ if (D + sizeof(ValueProfData) > BufferEnd)
+ return instrprof_error::truncated;
+
+ const unsigned char *Header = D;
+ uint32_t TotalSize = swapToHostOrder<uint32_t>(Header, Endianness);
+ uint32_t NumValueKinds = swapToHostOrder<uint32_t>(Header, Endianness);
+
+ if (D + TotalSize > BufferEnd)
+ return instrprof_error::too_large;
+ if (NumValueKinds > IPVK_Last + 1)
+ return instrprof_error::malformed;
+ // Total size needs to be mulltiple of quadword size.
+ if (TotalSize % sizeof(uint64_t))
+ return instrprof_error::malformed;
+
+ std::unique_ptr<ValueProfData> VPD = AllocValueProfData(TotalSize);
+
+ memcpy(VPD.get(), D, TotalSize);
+ // Byte swap.
+ VPD->swapBytesToHost(Endianness);
+
+ // Data integrity check:
+ ValueProfRecord *VR = VPD->getFirstValueProfRecord();
+ for (uint32_t K = 0; K < VPD->NumValueKinds; K++) {
+ if (VR->Kind > IPVK_Last)
+ return instrprof_error::malformed;
+ VR = getValueProfRecordNext(VR);
+ if ((char *)VR - (char *)VPD.get() > (ptrdiff_t)TotalSize)
+ return instrprof_error::malformed;
+ }
+
+ return std::move(VPD);
+}
+
+void ValueProfData::swapBytesToHost(support::endianness Endianness) {
+ using namespace support;
+ if (Endianness == getHostEndianness())
+ return;
+
+ sys::swapByteOrder<uint32_t>(TotalSize);
+ sys::swapByteOrder<uint32_t>(NumValueKinds);
+
+ ValueProfRecord *VR = getFirstValueProfRecord();
+ for (uint32_t K = 0; K < NumValueKinds; K++) {
+ VR->swapBytes(Endianness, getHostEndianness());
+ VR = getValueProfRecordNext(VR);
+ }
+}
+
+void ValueProfData::swapBytesFromHost(support::endianness Endianness) {
+ using namespace support;
+ if (Endianness == getHostEndianness())
+ return;
+
+ ValueProfRecord *VR = getFirstValueProfRecord();
+ for (uint32_t K = 0; K < NumValueKinds; K++) {
+ ValueProfRecord *NVR = getValueProfRecordNext(VR);
+ VR->swapBytes(getHostEndianness(), Endianness);
+ VR = NVR;
+ }
+ sys::swapByteOrder<uint32_t>(TotalSize);
+ sys::swapByteOrder<uint32_t>(NumValueKinds);
+}
+
+ValueProfRecord *ValueProfData::getFirstValueProfRecord() {
+ return reinterpret_cast<ValueProfRecord *>((char *)this +
+ sizeof(ValueProfData));
+}
}
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