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https://github.com/c64scene-ar/llvm-6502.git
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09e5af7d61
Have the InstrProfWriter return a MemoryBuffer instead of a std::string. This fixes the alignment issues the reader would hit, and it's a more appropriate type for this anyway. I've also removed an ugly helper function that's not needed since we're allowing initializer lists now, and updated some error code checks based on MSVC's issues with r229473. This reverts r229483, reapplying r229478. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@229602 91177308-0d34-0410-b5e6-96231b3b80d8
308 lines
10 KiB
C++
308 lines
10 KiB
C++
//=-- InstrProfReader.h - Instrumented profiling readers ----------*- C++ -*-=//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file contains support for reading profiling data for instrumentation
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// based PGO and coverage.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_PROFILEDATA_INSTRPROFREADER_H
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#define LLVM_PROFILEDATA_INSTRPROFREADER_H
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#include "llvm/ADT/ArrayRef.h"
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#include "llvm/ADT/StringExtras.h"
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#include "llvm/ProfileData/InstrProf.h"
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#include "llvm/Support/EndianStream.h"
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#include "llvm/Support/ErrorOr.h"
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#include "llvm/Support/LineIterator.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include "llvm/Support/OnDiskHashTable.h"
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#include <iterator>
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namespace llvm {
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class InstrProfReader;
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/// Profiling information for a single function.
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struct InstrProfRecord {
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InstrProfRecord() {}
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InstrProfRecord(StringRef Name, uint64_t Hash, ArrayRef<uint64_t> Counts)
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: Name(Name), Hash(Hash), Counts(Counts) {}
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StringRef Name;
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uint64_t Hash;
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ArrayRef<uint64_t> Counts;
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};
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/// A file format agnostic iterator over profiling data.
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class InstrProfIterator : public std::iterator<std::input_iterator_tag,
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InstrProfRecord> {
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InstrProfReader *Reader;
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InstrProfRecord Record;
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void Increment();
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public:
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InstrProfIterator() : Reader(nullptr) {}
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InstrProfIterator(InstrProfReader *Reader) : Reader(Reader) { Increment(); }
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InstrProfIterator &operator++() { Increment(); return *this; }
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bool operator==(const InstrProfIterator &RHS) { return Reader == RHS.Reader; }
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bool operator!=(const InstrProfIterator &RHS) { return Reader != RHS.Reader; }
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InstrProfRecord &operator*() { return Record; }
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InstrProfRecord *operator->() { return &Record; }
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};
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/// Base class and interface for reading profiling data of any known instrprof
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/// format. Provides an iterator over InstrProfRecords.
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class InstrProfReader {
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std::error_code LastError;
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public:
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InstrProfReader() : LastError(instrprof_error::success) {}
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virtual ~InstrProfReader() {}
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/// Read the header. Required before reading first record.
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virtual std::error_code readHeader() = 0;
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/// Read a single record.
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virtual std::error_code readNextRecord(InstrProfRecord &Record) = 0;
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/// Iterator over profile data.
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InstrProfIterator begin() { return InstrProfIterator(this); }
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InstrProfIterator end() { return InstrProfIterator(); }
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protected:
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/// Set the current std::error_code and return same.
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std::error_code error(std::error_code EC) {
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LastError = EC;
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return EC;
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}
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/// Clear the current error code and return a successful one.
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std::error_code success() { return error(instrprof_error::success); }
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public:
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/// Return true if the reader has finished reading the profile data.
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bool isEOF() { return LastError == instrprof_error::eof; }
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/// Return true if the reader encountered an error reading profiling data.
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bool hasError() { return LastError && !isEOF(); }
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/// Get the current error code.
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std::error_code getError() { return LastError; }
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/// Factory method to create an appropriately typed reader for the given
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/// instrprof file.
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static ErrorOr<std::unique_ptr<InstrProfReader>> create(std::string Path);
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static ErrorOr<std::unique_ptr<InstrProfReader>>
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create(std::unique_ptr<MemoryBuffer> Buffer);
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};
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/// Reader for the simple text based instrprof format.
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///
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/// This format is a simple text format that's suitable for test data. Records
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/// are separated by one or more blank lines, and record fields are separated by
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/// new lines.
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///
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/// Each record consists of a function name, a function hash, a number of
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/// counters, and then each counter value, in that order.
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class TextInstrProfReader : public InstrProfReader {
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private:
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/// The profile data file contents.
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std::unique_ptr<MemoryBuffer> DataBuffer;
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/// Iterator over the profile data.
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line_iterator Line;
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/// The current set of counter values.
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std::vector<uint64_t> Counts;
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TextInstrProfReader(const TextInstrProfReader &) = delete;
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TextInstrProfReader &operator=(const TextInstrProfReader &) = delete;
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public:
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TextInstrProfReader(std::unique_ptr<MemoryBuffer> DataBuffer_)
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: DataBuffer(std::move(DataBuffer_)), Line(*DataBuffer, true, '#') {}
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/// Read the header.
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std::error_code readHeader() override { return success(); }
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/// Read a single record.
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std::error_code readNextRecord(InstrProfRecord &Record) override;
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};
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/// Reader for the raw instrprof binary format from runtime.
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///
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/// This format is a raw memory dump of the instrumentation-baed profiling data
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/// from the runtime. It has no index.
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///
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/// Templated on the unsigned type whose size matches pointers on the platform
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/// that wrote the profile.
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template <class IntPtrT>
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class RawInstrProfReader : public InstrProfReader {
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private:
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/// The profile data file contents.
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std::unique_ptr<MemoryBuffer> DataBuffer;
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/// The current set of counter values.
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std::vector<uint64_t> Counts;
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struct ProfileData {
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const uint32_t NameSize;
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const uint32_t NumCounters;
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const uint64_t FuncHash;
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const IntPtrT NamePtr;
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const IntPtrT CounterPtr;
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};
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struct RawHeader {
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const uint64_t Magic;
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const uint64_t Version;
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const uint64_t DataSize;
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const uint64_t CountersSize;
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const uint64_t NamesSize;
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const uint64_t CountersDelta;
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const uint64_t NamesDelta;
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};
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bool ShouldSwapBytes;
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uint64_t CountersDelta;
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uint64_t NamesDelta;
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const ProfileData *Data;
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const ProfileData *DataEnd;
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const uint64_t *CountersStart;
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const char *NamesStart;
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const char *ProfileEnd;
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RawInstrProfReader(const RawInstrProfReader &) = delete;
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RawInstrProfReader &operator=(const RawInstrProfReader &) = delete;
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public:
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RawInstrProfReader(std::unique_ptr<MemoryBuffer> DataBuffer)
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: DataBuffer(std::move(DataBuffer)) { }
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static bool hasFormat(const MemoryBuffer &DataBuffer);
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std::error_code readHeader() override;
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std::error_code readNextRecord(InstrProfRecord &Record) override;
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private:
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std::error_code readNextHeader(const char *CurrentPos);
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std::error_code readHeader(const RawHeader &Header);
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template <class IntT>
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IntT swap(IntT Int) const {
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return ShouldSwapBytes ? sys::getSwappedBytes(Int) : Int;
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}
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const uint64_t *getCounter(IntPtrT CounterPtr) const {
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ptrdiff_t Offset = (swap(CounterPtr) - CountersDelta) / sizeof(uint64_t);
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return CountersStart + Offset;
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}
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const char *getName(IntPtrT NamePtr) const {
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ptrdiff_t Offset = (swap(NamePtr) - NamesDelta) / sizeof(char);
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return NamesStart + Offset;
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}
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};
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typedef RawInstrProfReader<uint32_t> RawInstrProfReader32;
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typedef RawInstrProfReader<uint64_t> RawInstrProfReader64;
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namespace IndexedInstrProf {
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enum class HashT : uint32_t;
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}
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/// Trait for lookups into the on-disk hash table for the binary instrprof
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/// format.
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class InstrProfLookupTrait {
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std::vector<uint64_t> DataBuffer;
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IndexedInstrProf::HashT HashType;
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public:
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InstrProfLookupTrait(IndexedInstrProf::HashT HashType) : HashType(HashType) {}
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struct data_type {
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data_type(StringRef Name, ArrayRef<uint64_t> Data)
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: Name(Name), Data(Data) {}
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StringRef Name;
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ArrayRef<uint64_t> Data;
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};
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typedef StringRef internal_key_type;
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typedef StringRef external_key_type;
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typedef uint64_t hash_value_type;
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typedef uint64_t offset_type;
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static bool EqualKey(StringRef A, StringRef B) { return A == B; }
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static StringRef GetInternalKey(StringRef K) { return K; }
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hash_value_type ComputeHash(StringRef K);
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static std::pair<offset_type, offset_type>
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ReadKeyDataLength(const unsigned char *&D) {
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using namespace support;
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offset_type KeyLen = endian::readNext<offset_type, little, unaligned>(D);
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offset_type DataLen = endian::readNext<offset_type, little, unaligned>(D);
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return std::make_pair(KeyLen, DataLen);
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}
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StringRef ReadKey(const unsigned char *D, offset_type N) {
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return StringRef((const char *)D, N);
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}
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data_type ReadData(StringRef K, const unsigned char *D, offset_type N) {
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DataBuffer.clear();
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if (N % sizeof(uint64_t))
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// The data is corrupt, don't try to read it.
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return data_type("", DataBuffer);
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using namespace support;
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// We just treat the data as opaque here. It's simpler to handle in
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// IndexedInstrProfReader.
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unsigned NumEntries = N / sizeof(uint64_t);
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DataBuffer.reserve(NumEntries);
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for (unsigned I = 0; I < NumEntries; ++I)
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DataBuffer.push_back(endian::readNext<uint64_t, little, unaligned>(D));
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return data_type(K, DataBuffer);
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}
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};
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typedef OnDiskIterableChainedHashTable<InstrProfLookupTrait>
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InstrProfReaderIndex;
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/// Reader for the indexed binary instrprof format.
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class IndexedInstrProfReader : public InstrProfReader {
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private:
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/// The profile data file contents.
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std::unique_ptr<MemoryBuffer> DataBuffer;
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/// The index into the profile data.
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std::unique_ptr<InstrProfReaderIndex> Index;
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/// Iterator over the profile data.
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InstrProfReaderIndex::data_iterator RecordIterator;
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/// Offset into our current data set.
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size_t CurrentOffset;
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/// The file format version of the profile data.
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uint64_t FormatVersion;
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/// The maximal execution count among all functions.
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uint64_t MaxFunctionCount;
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IndexedInstrProfReader(const IndexedInstrProfReader &) = delete;
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IndexedInstrProfReader &operator=(const IndexedInstrProfReader &) = delete;
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public:
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IndexedInstrProfReader(std::unique_ptr<MemoryBuffer> DataBuffer)
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: DataBuffer(std::move(DataBuffer)), Index(nullptr), CurrentOffset(0) {}
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/// Return true if the given buffer is in an indexed instrprof format.
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static bool hasFormat(const MemoryBuffer &DataBuffer);
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/// Read the file header.
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std::error_code readHeader() override;
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/// Read a single record.
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std::error_code readNextRecord(InstrProfRecord &Record) override;
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/// Fill Counts with the profile data for the given function name.
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std::error_code getFunctionCounts(StringRef FuncName, uint64_t FuncHash,
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std::vector<uint64_t> &Counts);
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/// Return the maximum of all known function counts.
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uint64_t getMaximumFunctionCount() { return MaxFunctionCount; }
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/// Factory method to create an indexed reader.
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static ErrorOr<std::unique_ptr<IndexedInstrProfReader>>
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create(std::string Path);
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static ErrorOr<std::unique_ptr<IndexedInstrProfReader>>
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create(std::unique_ptr<MemoryBuffer> Buffer);
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};
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} // end namespace llvm
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#endif
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