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InstrProf.h
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InstrProf.h
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//=-- InstrProf.h - Instrumented profiling format support ---------*- C++ -*-=//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// Instrumentation-based profiling data is generated by instrumented
// binaries through library functions in compiler-rt, and read by the clang
// frontend to feed PGO.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_PROFILEDATA_INSTRPROF_H_
#define LLVM_PROFILEDATA_INSTRPROF_H_
#include "llvm/ADT/StringRef.h"
#include "llvm/ADT/StringSet.h"
#include "llvm/Support/Endian.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/MD5.h"
#include <cstdint>
#include <list>
#include <system_error>
#include <vector>
namespace llvm {
/// Return the name of data section containing profile counter variables.
inline StringRef getInstrProfCountersSectionName(bool AddSegment) {
return AddSegment ? "__DATA,__llvm_prf_cnts" : "__llvm_prf_cnts";
}
/// Return the name of data section containing names of instrumented
/// functions.
inline StringRef getInstrProfNameSectionName(bool AddSegment) {
return AddSegment ? "__DATA,__llvm_prf_names" : "__llvm_prf_names";
}
/// Return the name of the data section containing per-function control
/// data.
inline StringRef getInstrProfDataSectionName(bool AddSegment) {
return AddSegment ? "__DATA,__llvm_prf_data" : "__llvm_prf_data";
}
/// Return the name of the section containing function coverage mapping
/// data.
inline StringRef getInstrProfCoverageSectionName(bool AddSegment) {
return AddSegment ? "__DATA,__llvm_covmap" : "__llvm_covmap";
}
/// Return the name prefix of variables containing instrumented function names.
inline StringRef getInstrProfNameVarPrefix() { return "__llvm_profile_name_"; }
/// Return the name prefix of variables containing per-function control data.
inline StringRef getInstrProfDataVarPrefix() { return "__llvm_profile_data_"; }
/// Return the name prefix of profile counter variables.
inline StringRef getInstrProfCountersVarPrefix() {
return "__llvm_profile_counters_";
}
/// Return the name prefix of the COMDAT group for instrumentation variables
/// associated with a COMDAT function.
inline StringRef getInstrProfComdatPrefix() { return "__llvm_profile_vars_"; }
/// Return the name of a covarage mapping variable (internal linkage)
/// for each instrumented source module. Such variables are allocated
/// in the __llvm_covmap section.
inline StringRef getCoverageMappingVarName() {
return "__llvm_coverage_mapping";
}
/// Return the name of function that registers all the per-function control
/// data at program startup time by calling __llvm_register_function. This
/// function has internal linkage and is called by __llvm_profile_init
/// runtime method. This function is not generated for these platforms:
/// Darwin, Linux, and FreeBSD.
inline StringRef getInstrProfRegFuncsName() {
return "__llvm_profile_register_functions";
}
/// Return the name of the runtime interface that registers per-function control
/// data for one instrumented function.
inline StringRef getInstrProfRegFuncName() {
return "__llvm_profile_register_function";
}
/// Return the name of the runtime initialization method that is generated by
/// the compiler. The function calls __llvm_profile_register_functions and
/// __llvm_profile_override_default_filename functions if needed. This function
/// has internal linkage and invoked at startup time via init_array.
inline StringRef getInstrProfInitFuncName() { return "__llvm_profile_init"; }
/// Return the name of the hook variable defined in profile runtime library.
/// A reference to the variable causes the linker to link in the runtime
/// initialization module (which defines the hook variable).
inline StringRef getInstrProfRuntimeHookVarName() {
return "__llvm_profile_runtime";
}
/// Return the name of the compiler generated function that references the
/// runtime hook variable. The function is a weak global.
inline StringRef getInstrProfRuntimeHookVarUseFuncName() {
return "__llvm_profile_runtime_user";
}
/// Return the name of the profile runtime interface that overrides the default
/// profile data file name.
inline StringRef getInstrProfFileOverriderFuncName() {
return "__llvm_profile_override_default_filename";
}
const std::error_category &instrprof_category();
enum class instrprof_error {
success = 0,
eof,
bad_magic,
bad_header,
unsupported_version,
unsupported_hash_type,
too_large,
truncated,
malformed,
unknown_function,
hash_mismatch,
count_mismatch,
counter_overflow,
value_site_count_mismatch
};
inline std::error_code make_error_code(instrprof_error E) {
return std::error_code(static_cast<int>(E), instrprof_category());
}
enum InstrProfValueKind : uint32_t {
IPVK_IndirectCallTarget = 0,
IPVK_First = IPVK_IndirectCallTarget,
IPVK_Last = IPVK_IndirectCallTarget
};
struct InstrProfStringTable {
// Set of string values in profiling data.
StringSet<> StringValueSet;
InstrProfStringTable() { StringValueSet.clear(); }
// Get a pointer to internal storage of a string in set
const char *getStringData(StringRef Str) {
auto Result = StringValueSet.find(Str);
return (Result == StringValueSet.end()) ? nullptr : Result->first().data();
}
// Insert a string to StringTable
const char *insertString(StringRef Str) {
auto Result = StringValueSet.insert(Str);
return Result.first->first().data();
}
};
struct InstrProfValueData {
// Profiled value.
uint64_t Value;
// Number of times the value appears in the training run.
uint64_t Count;
};
struct InstrProfValueSiteRecord {
/// Value profiling data pairs at a given value site.
std::list<InstrProfValueData> ValueData;
InstrProfValueSiteRecord() { ValueData.clear(); }
template <class InputIterator>
InstrProfValueSiteRecord(InputIterator F, InputIterator L)
: ValueData(F, L) {}
/// Sort ValueData ascending by Value
void sortByTargetValues() {
ValueData.sort(
[](const InstrProfValueData &left, const InstrProfValueData &right) {
return left.Value < right.Value;
});
}
/// Merge data from another InstrProfValueSiteRecord
void mergeValueData(InstrProfValueSiteRecord &Input) {
this->sortByTargetValues();
Input.sortByTargetValues();
auto I = ValueData.begin();
auto IE = ValueData.end();
for (auto J = Input.ValueData.begin(), JE = Input.ValueData.end(); J != JE;
++J) {
while (I != IE && I->Value < J->Value) ++I;
if (I != IE && I->Value == J->Value) {
I->Count += J->Count;
++I;
continue;
}
ValueData.insert(I, *J);
}
}
};
/// Profiling information for a single function.
struct InstrProfRecord {
InstrProfRecord() {}
InstrProfRecord(StringRef Name, uint64_t Hash, std::vector<uint64_t> Counts)
: Name(Name), Hash(Hash), Counts(std::move(Counts)) {}
StringRef Name;
uint64_t Hash;
std::vector<uint64_t> Counts;
typedef std::vector<std::pair<uint64_t, const char *>> ValueMapType;
/// Return the number of value profile kinds with non-zero number
/// of profile sites.
inline uint32_t getNumValueKinds() const;
/// Return the number of instrumented sites for ValueKind.
inline uint32_t getNumValueSites(uint32_t ValueKind) const;
/// Return the total number of ValueData for ValueKind.
inline uint32_t getNumValueData(uint32_t ValueKind) const;
/// Return the number of value data collected for ValueKind at profiling
/// site: Site.
inline uint32_t getNumValueDataForSite(uint32_t ValueKind,
uint32_t Site) const;
inline std::unique_ptr<InstrProfValueData[]> getValueForSite(
uint32_t ValueKind, uint32_t Site) const;
/// Reserve space for NumValueSites sites.
inline void reserveSites(uint32_t ValueKind, uint32_t NumValueSites);
/// Add ValueData for ValueKind at value Site.
inline void addValueData(uint32_t ValueKind, uint32_t Site,
InstrProfValueData *VData, uint32_t N,
ValueMapType *HashKeys);
/// Merge Value Profile ddata from Src record to this record for ValueKind.
inline instrprof_error mergeValueProfData(uint32_t ValueKind,
InstrProfRecord &Src);
/// Used by InstrProfWriter: update the value strings to commoned strings in
/// the writer instance.
inline void updateStrings(InstrProfStringTable *StrTab);
private:
std::vector<InstrProfValueSiteRecord> IndirectCallSites;
const std::vector<InstrProfValueSiteRecord> &
getValueSitesForKind(uint32_t ValueKind) const {
switch (ValueKind) {
case IPVK_IndirectCallTarget:
return IndirectCallSites;
default:
llvm_unreachable("Unknown value kind!");
}
return IndirectCallSites;
}
std::vector<InstrProfValueSiteRecord> &
getValueSitesForKind(uint32_t ValueKind) {
return const_cast<std::vector<InstrProfValueSiteRecord> &>(
const_cast<const InstrProfRecord *>(this)
->getValueSitesForKind(ValueKind));
}
// Map indirect call target name hash to name string.
uint64_t remapValue(uint64_t Value, uint32_t ValueKind,
ValueMapType *HashKeys) {
if (!HashKeys) return Value;
switch (ValueKind) {
case IPVK_IndirectCallTarget: {
auto Result =
std::lower_bound(HashKeys->begin(), HashKeys->end(), Value,
[](const std::pair<uint64_t, const char *> &LHS,
uint64_t RHS) { return LHS.first < RHS; });
assert(Result != HashKeys->end() &&
"Hash does not match any known keys\n");
Value = (uint64_t)Result->second;
break;
}
}
return Value;
}
};
uint32_t InstrProfRecord::getNumValueKinds() const {
uint32_t NumValueKinds = 0;
for (uint32_t Kind = IPVK_First; Kind <= IPVK_Last; ++Kind)
NumValueKinds += !(getValueSitesForKind(Kind).empty());
return NumValueKinds;
}
uint32_t InstrProfRecord::getNumValueSites(uint32_t ValueKind) const {
return getValueSitesForKind(ValueKind).size();
}
uint32_t InstrProfRecord::getNumValueDataForSite(uint32_t ValueKind,
uint32_t Site) const {
return getValueSitesForKind(ValueKind)[Site].ValueData.size();
}
std::unique_ptr<InstrProfValueData[]> InstrProfRecord::getValueForSite(
uint32_t ValueKind, uint32_t Site) const {
uint32_t N = getNumValueDataForSite(ValueKind, Site);
if (N == 0) return std::unique_ptr<InstrProfValueData[]>(nullptr);
std::unique_ptr<InstrProfValueData[]> VD(new InstrProfValueData[N]);
uint32_t I = 0;
for (auto V : getValueSitesForKind(ValueKind)[Site].ValueData) {
VD[I] = V;
I++;
}
assert(I == N);
return VD;
}
void InstrProfRecord::addValueData(uint32_t ValueKind, uint32_t Site,
InstrProfValueData *VData, uint32_t N,
ValueMapType *HashKeys) {
for (uint32_t I = 0; I < N; I++) {
VData[I].Value = remapValue(VData[I].Value, ValueKind, HashKeys);
}
std::vector<InstrProfValueSiteRecord> &ValueSites =
getValueSitesForKind(ValueKind);
if (N == 0)
ValueSites.push_back(InstrProfValueSiteRecord());
else
ValueSites.emplace_back(VData, VData + N);
}
void InstrProfRecord::reserveSites(uint32_t ValueKind, uint32_t NumValueSites) {
std::vector<InstrProfValueSiteRecord> &ValueSites =
getValueSitesForKind(ValueKind);
ValueSites.reserve(NumValueSites);
}
instrprof_error InstrProfRecord::mergeValueProfData(uint32_t ValueKind,
InstrProfRecord &Src) {
uint32_t ThisNumValueSites = getNumValueSites(ValueKind);
uint32_t OtherNumValueSites = Src.getNumValueSites(ValueKind);
if (ThisNumValueSites != OtherNumValueSites)
return instrprof_error::value_site_count_mismatch;
std::vector<InstrProfValueSiteRecord> &ThisSiteRecords =
getValueSitesForKind(ValueKind);
std::vector<InstrProfValueSiteRecord> &OtherSiteRecords =
Src.getValueSitesForKind(ValueKind);
for (uint32_t I = 0; I < ThisNumValueSites; I++)
ThisSiteRecords[I].mergeValueData(OtherSiteRecords[I]);
return instrprof_error::success;
}
void InstrProfRecord::updateStrings(InstrProfStringTable *StrTab) {
if (!StrTab) return;
Name = StrTab->insertString(Name);
for (auto &VSite : IndirectCallSites)
for (auto &VData : VSite.ValueData)
VData.Value = (uint64_t)StrTab->insertString((const char *)VData.Value);
}
namespace IndexedInstrProf {
enum class HashT : uint32_t {
MD5,
Last = MD5
};
static inline uint64_t MD5Hash(StringRef Str) {
MD5 Hash;
Hash.update(Str);
llvm::MD5::MD5Result Result;
Hash.final(Result);
// Return the least significant 8 bytes. Our MD5 implementation returns the
// result in little endian, so we may need to swap bytes.
using namespace llvm::support;
return endian::read<uint64_t, little, unaligned>(Result);
}
static inline uint64_t ComputeHash(HashT Type, StringRef K) {
switch (Type) {
case HashT::MD5:
return IndexedInstrProf::MD5Hash(K);
}
llvm_unreachable("Unhandled hash type");
}
const uint64_t Magic = 0x8169666f72706cff; // "\xfflprofi\x81"
const uint64_t Version = 3;
const HashT HashType = HashT::MD5;
struct Header {
uint64_t Magic;
uint64_t Version;
uint64_t MaxFunctionCount;
uint64_t HashType;
uint64_t HashOffset;
};
} // end namespace IndexedInstrProf
namespace RawInstrProf {
const uint64_t Version = 1;
// Magic number to detect file format and endianness.
// Use 255 at one end, since no UTF-8 file can use that character. Avoid 0,
// so that utilities, like strings, don't grab it as a string. 129 is also
// invalid UTF-8, and high enough to be interesting.
// Use "lprofr" in the centre to stand for "LLVM Profile Raw", or "lprofR"
// for 32-bit platforms.
// The magic and version need to be kept in sync with
// projects/compiler-rt/lib/profile/InstrProfiling.c
template <class IntPtrT>
inline uint64_t getMagic();
template <>
inline uint64_t getMagic<uint64_t>() {
return uint64_t(255) << 56 | uint64_t('l') << 48 | uint64_t('p') << 40 |
uint64_t('r') << 32 | uint64_t('o') << 24 | uint64_t('f') << 16 |
uint64_t('r') << 8 | uint64_t(129);
}
template <>
inline uint64_t getMagic<uint32_t>() {
return uint64_t(255) << 56 | uint64_t('l') << 48 | uint64_t('p') << 40 |
uint64_t('r') << 32 | uint64_t('o') << 24 | uint64_t('f') << 16 |
uint64_t('R') << 8 | uint64_t(129);
}
// The definition should match the structure defined in
// compiler-rt/lib/profile/InstrProfiling.h.
// It should also match the synthesized type in
// Transforms/Instrumentation/InstrProfiling.cpp:getOrCreateRegionCounters.
template <class IntPtrT>
struct ProfileData {
#define INSTR_PROF_DATA(Type, LLVMType, Name, Init) Type Name;
#include "llvm/ProfileData/InstrProfData.inc"
};
// The definition should match the header referenced in
// compiler-rt/lib/profile/InstrProfilingFile.c and
// InstrProfilingBuffer.c.
struct Header {
const uint64_t Magic;
const uint64_t Version;
const uint64_t DataSize;
const uint64_t CountersSize;
const uint64_t NamesSize;
const uint64_t CountersDelta;
const uint64_t NamesDelta;
};
} // end namespace RawInstrProf
namespace coverage {
LLVM_PACKED_START
template <class IntPtrT>
struct CovMapFunctionRecord {
#define COVMAP_FUNC_RECORD(Type, LLVMType, Name, Init) Type Name;
#include "llvm/ProfileData/InstrProfData.inc"
};
LLVM_PACKED_END
}
} // end namespace llvm
namespace std {
template <>
struct is_error_code_enum<llvm::instrprof_error> : std::true_type {};
}
#endif // LLVM_PROFILEDATA_INSTRPROF_H_