llvm-6502/include/llvm/ProfileData/InstrProfReader.h
Benjamin Kramer 00e08fcaa0 Canonicalize header guards into a common format.
Add header guards to files that were missing guards. Remove #endif comments
as they don't seem common in LLVM (we can easily add them back if we decide
they're useful)

Changes made by clang-tidy with minor tweaks.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@215558 91177308-0d34-0410-b5e6-96231b3b80d8
2014-08-13 16:26:38 +00:00

306 lines
10 KiB
C++

//=-- InstrProfReader.h - Instrumented profiling readers ----------*- C++ -*-=//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains support for reading profiling data for instrumentation
// based PGO and coverage.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_PROFILEDATA_INSTRPROFREADER_H
#define LLVM_PROFILEDATA_INSTRPROFREADER_H
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/ProfileData/InstrProf.h"
#include "llvm/Support/LineIterator.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/EndianStream.h"
#include "llvm/Support/OnDiskHashTable.h"
#include <iterator>
namespace llvm {
class InstrProfReader;
/// Profiling information for a single function.
struct InstrProfRecord {
InstrProfRecord() {}
InstrProfRecord(StringRef Name, uint64_t Hash, ArrayRef<uint64_t> Counts)
: Name(Name), Hash(Hash), Counts(Counts) {}
StringRef Name;
uint64_t Hash;
ArrayRef<uint64_t> Counts;
};
/// A file format agnostic iterator over profiling data.
class InstrProfIterator : public std::iterator<std::input_iterator_tag,
InstrProfRecord> {
InstrProfReader *Reader;
InstrProfRecord Record;
void Increment();
public:
InstrProfIterator() : Reader(nullptr) {}
InstrProfIterator(InstrProfReader *Reader) : Reader(Reader) { Increment(); }
InstrProfIterator &operator++() { Increment(); return *this; }
bool operator==(const InstrProfIterator &RHS) { return Reader == RHS.Reader; }
bool operator!=(const InstrProfIterator &RHS) { return Reader != RHS.Reader; }
InstrProfRecord &operator*() { return Record; }
InstrProfRecord *operator->() { return &Record; }
};
/// Base class and interface for reading profiling data of any known instrprof
/// format. Provides an iterator over InstrProfRecords.
class InstrProfReader {
std::error_code LastError;
public:
InstrProfReader() : LastError(instrprof_error::success) {}
virtual ~InstrProfReader() {}
/// Read the header. Required before reading first record.
virtual std::error_code readHeader() = 0;
/// Read a single record.
virtual std::error_code readNextRecord(InstrProfRecord &Record) = 0;
/// Iterator over profile data.
InstrProfIterator begin() { return InstrProfIterator(this); }
InstrProfIterator end() { return InstrProfIterator(); }
protected:
/// Set the current std::error_code and return same.
std::error_code error(std::error_code EC) {
LastError = EC;
return EC;
}
/// Clear the current error code and return a successful one.
std::error_code success() { return error(instrprof_error::success); }
public:
/// Return true if the reader has finished reading the profile data.
bool isEOF() { return LastError == instrprof_error::eof; }
/// Return true if the reader encountered an error reading profiling data.
bool hasError() { return LastError && !isEOF(); }
/// Get the current error code.
std::error_code getError() { return LastError; }
/// Factory method to create an appropriately typed reader for the given
/// instrprof file.
static std::error_code create(std::string Path,
std::unique_ptr<InstrProfReader> &Result);
};
/// Reader for the simple text based instrprof format.
///
/// This format is a simple text format that's suitable for test data. Records
/// are separated by one or more blank lines, and record fields are separated by
/// new lines.
///
/// Each record consists of a function name, a function hash, a number of
/// counters, and then each counter value, in that order.
class TextInstrProfReader : public InstrProfReader {
private:
/// The profile data file contents.
std::unique_ptr<MemoryBuffer> DataBuffer;
/// Iterator over the profile data.
line_iterator Line;
/// The current set of counter values.
std::vector<uint64_t> Counts;
TextInstrProfReader(const TextInstrProfReader &) LLVM_DELETED_FUNCTION;
TextInstrProfReader &operator=(const TextInstrProfReader &)
LLVM_DELETED_FUNCTION;
public:
TextInstrProfReader(std::unique_ptr<MemoryBuffer> DataBuffer_)
: DataBuffer(std::move(DataBuffer_)), Line(*DataBuffer, '#') {}
/// Read the header.
std::error_code readHeader() override { return success(); }
/// Read a single record.
std::error_code readNextRecord(InstrProfRecord &Record) override;
};
/// Reader for the raw instrprof binary format from runtime.
///
/// This format is a raw memory dump of the instrumentation-baed profiling data
/// from the runtime. It has no index.
///
/// Templated on the unsigned type whose size matches pointers on the platform
/// that wrote the profile.
template <class IntPtrT>
class RawInstrProfReader : public InstrProfReader {
private:
/// The profile data file contents.
std::unique_ptr<MemoryBuffer> DataBuffer;
/// The current set of counter values.
std::vector<uint64_t> Counts;
struct ProfileData {
const uint32_t NameSize;
const uint32_t NumCounters;
const uint64_t FuncHash;
const IntPtrT NamePtr;
const IntPtrT CounterPtr;
};
struct RawHeader {
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;
};
bool ShouldSwapBytes;
uint64_t CountersDelta;
uint64_t NamesDelta;
const ProfileData *Data;
const ProfileData *DataEnd;
const uint64_t *CountersStart;
const char *NamesStart;
const char *ProfileEnd;
RawInstrProfReader(const RawInstrProfReader &) LLVM_DELETED_FUNCTION;
RawInstrProfReader &operator=(const RawInstrProfReader &)
LLVM_DELETED_FUNCTION;
public:
RawInstrProfReader(std::unique_ptr<MemoryBuffer> DataBuffer)
: DataBuffer(std::move(DataBuffer)) { }
static bool hasFormat(const MemoryBuffer &DataBuffer);
std::error_code readHeader() override;
std::error_code readNextRecord(InstrProfRecord &Record) override;
private:
std::error_code readNextHeader(const char *CurrentPos);
std::error_code readHeader(const RawHeader &Header);
template <class IntT>
IntT swap(IntT Int) const {
return ShouldSwapBytes ? sys::getSwappedBytes(Int) : Int;
}
const uint64_t *getCounter(IntPtrT CounterPtr) const {
ptrdiff_t Offset = (swap(CounterPtr) - CountersDelta) / sizeof(uint64_t);
return CountersStart + Offset;
}
const char *getName(IntPtrT NamePtr) const {
ptrdiff_t Offset = (swap(NamePtr) - NamesDelta) / sizeof(char);
return NamesStart + Offset;
}
};
typedef RawInstrProfReader<uint32_t> RawInstrProfReader32;
typedef RawInstrProfReader<uint64_t> RawInstrProfReader64;
namespace IndexedInstrProf {
enum class HashT : uint32_t;
}
/// Trait for lookups into the on-disk hash table for the binary instrprof
/// format.
class InstrProfLookupTrait {
std::vector<uint64_t> DataBuffer;
IndexedInstrProf::HashT HashType;
public:
InstrProfLookupTrait(IndexedInstrProf::HashT HashType) : HashType(HashType) {}
struct data_type {
data_type(StringRef Name, ArrayRef<uint64_t> Data)
: Name(Name), Data(Data) {}
StringRef Name;
ArrayRef<uint64_t> Data;
};
typedef StringRef internal_key_type;
typedef StringRef external_key_type;
typedef uint64_t hash_value_type;
typedef uint64_t offset_type;
static bool EqualKey(StringRef A, StringRef B) { return A == B; }
static StringRef GetInternalKey(StringRef K) { return K; }
hash_value_type ComputeHash(StringRef K);
static std::pair<offset_type, offset_type>
ReadKeyDataLength(const unsigned char *&D) {
using namespace support;
offset_type KeyLen = endian::readNext<offset_type, little, unaligned>(D);
offset_type DataLen = endian::readNext<offset_type, little, unaligned>(D);
return std::make_pair(KeyLen, DataLen);
}
StringRef ReadKey(const unsigned char *D, offset_type N) {
return StringRef((const char *)D, N);
}
data_type ReadData(StringRef K, const unsigned char *D, offset_type N) {
DataBuffer.clear();
if (N % sizeof(uint64_t))
// The data is corrupt, don't try to read it.
return data_type("", DataBuffer);
using namespace support;
// We just treat the data as opaque here. It's simpler to handle in
// IndexedInstrProfReader.
unsigned NumEntries = N / sizeof(uint64_t);
DataBuffer.reserve(NumEntries);
for (unsigned I = 0; I < NumEntries; ++I)
DataBuffer.push_back(endian::readNext<uint64_t, little, unaligned>(D));
return data_type(K, DataBuffer);
}
};
typedef OnDiskIterableChainedHashTable<InstrProfLookupTrait>
InstrProfReaderIndex;
/// Reader for the indexed binary instrprof format.
class IndexedInstrProfReader : public InstrProfReader {
private:
/// The profile data file contents.
std::unique_ptr<MemoryBuffer> DataBuffer;
/// The index into the profile data.
std::unique_ptr<InstrProfReaderIndex> Index;
/// Iterator over the profile data.
InstrProfReaderIndex::data_iterator RecordIterator;
/// Offset into our current data set.
size_t CurrentOffset;
/// The file format version of the profile data.
uint64_t FormatVersion;
/// The maximal execution count among all functions.
uint64_t MaxFunctionCount;
IndexedInstrProfReader(const IndexedInstrProfReader &) LLVM_DELETED_FUNCTION;
IndexedInstrProfReader &operator=(const IndexedInstrProfReader &)
LLVM_DELETED_FUNCTION;
public:
IndexedInstrProfReader(std::unique_ptr<MemoryBuffer> DataBuffer)
: DataBuffer(std::move(DataBuffer)), Index(nullptr), CurrentOffset(0) {}
/// Return true if the given buffer is in an indexed instrprof format.
static bool hasFormat(const MemoryBuffer &DataBuffer);
/// Read the file header.
std::error_code readHeader() override;
/// Read a single record.
std::error_code readNextRecord(InstrProfRecord &Record) override;
/// Fill Counts with the profile data for the given function name.
std::error_code getFunctionCounts(StringRef FuncName, uint64_t FuncHash,
std::vector<uint64_t> &Counts);
/// Return the maximum of all known function counts.
uint64_t getMaximumFunctionCount() { return MaxFunctionCount; }
/// Factory method to create an indexed reader.
static std::error_code
create(std::string Path, std::unique_ptr<IndexedInstrProfReader> &Result);
};
} // end namespace llvm
#endif