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//===-- BenchmarkRunner.h ---------------------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
///
/// \file
/// Defines the abstract BenchmarkRunner class for measuring a certain execution
/// property of instructions (e.g. latency).
///
//===----------------------------------------------------------------------===//
#ifndef LLVM_TOOLS_LLVM_EXEGESIS_BENCHMARKRUNNER_H
#define LLVM_TOOLS_LLVM_EXEGESIS_BENCHMARKRUNNER_H
#include "Assembler.h"
#include "BenchmarkCode.h"
#include "BenchmarkResult.h"
#include "LlvmState.h"
#include "MCInstrDescView.h"
#include "SnippetRepetitor.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/MC/MCInst.h"
#include "llvm/Support/Error.h"
#include <cstdlib>
#include <memory>
#include <vector>
namespace llvm {
namespace exegesis {
// Common code for all benchmark modes.
class BenchmarkRunner {
public:
enum ExecutionModeE { InProcess, SubProcess };
explicit BenchmarkRunner(const LLVMState &State, Benchmark::ModeE Mode,
BenchmarkPhaseSelectorE BenchmarkPhaseSelector,
ExecutionModeE ExecutionMode,
ArrayRef<ValidationEvent> ValCounters);
virtual ~BenchmarkRunner();
class RunnableConfiguration {
friend class BenchmarkRunner;
public:
~RunnableConfiguration() = default;
RunnableConfiguration(RunnableConfiguration &&) = default;
RunnableConfiguration(const RunnableConfiguration &) = delete;
RunnableConfiguration &operator=(RunnableConfiguration &&) = delete;
RunnableConfiguration &operator=(const RunnableConfiguration &) = delete;
private:
RunnableConfiguration() = default;
Benchmark BenchmarkResult;
object::OwningBinary<object::ObjectFile> ObjectFile;
};
Expected<RunnableConfiguration>
getRunnableConfiguration(const BenchmarkCode &Configuration,
unsigned MinInstructions, unsigned LoopUnrollFactor,
const SnippetRepetitor &Repetitor) const;
std::pair<Error, Benchmark>
runConfiguration(RunnableConfiguration &&RC,
const std::optional<StringRef> &DumpFile) const;
// Scratch space to run instructions that touch memory.
struct ScratchSpace {
static constexpr const size_t kAlignment = 1024;
static constexpr const size_t kSize = 1 << 20; // 1MB.
ScratchSpace()
: UnalignedPtr(std::make_unique<char[]>(kSize + kAlignment)),
AlignedPtr(
UnalignedPtr.get() + kAlignment -
(reinterpret_cast<intptr_t>(UnalignedPtr.get()) % kAlignment)) {}
char *ptr() const { return AlignedPtr; }
void clear() { std::memset(ptr(), 0, kSize); }
private:
const std::unique_ptr<char[]> UnalignedPtr;
char *const AlignedPtr;
};
// A helper to measure counters while executing a function in a sandboxed
// context.
class FunctionExecutor {
public:
virtual ~FunctionExecutor();
Expected<SmallVector<int64_t, 4>>
runAndSample(const char *Counters,
ArrayRef<const char *> ValidationCounters,
SmallVectorImpl<int64_t> &ValidationCounterValues) const;
protected:
static void
accumulateCounterValues(const SmallVectorImpl<int64_t> &NewValues,
SmallVectorImpl<int64_t> *Result);
virtual Expected<SmallVector<int64_t, 4>>
runWithCounter(StringRef CounterName,
ArrayRef<const char *> ValidationCounters,
SmallVectorImpl<int64_t> &ValidationCounterValues) const = 0;
};
protected:
const LLVMState &State;
const Benchmark::ModeE Mode;
const BenchmarkPhaseSelectorE BenchmarkPhaseSelector;
const ExecutionModeE ExecutionMode;
SmallVector<ValidationEvent> ValidationCounters;
Error
getValidationCountersToRun(SmallVector<const char *> &ValCountersToRun) const;
private:
virtual Expected<std::vector<BenchmarkMeasure>>
runMeasurements(const FunctionExecutor &Executor) const = 0;
Expected<SmallString<0>>
assembleSnippet(const BenchmarkCode &BC, const SnippetRepetitor &Repetitor,
unsigned MinInstructions, unsigned LoopBodySize,
bool GenerateMemoryInstructions) const;
Expected<std::string> writeObjectFile(StringRef Buffer,
StringRef FileName) const;
const std::unique_ptr<ScratchSpace> Scratch;
Expected<std::unique_ptr<FunctionExecutor>>
createFunctionExecutor(object::OwningBinary<object::ObjectFile> Obj,
const BenchmarkKey &Key) const;
};
} // namespace exegesis
} // namespace llvm
#endif // LLVM_TOOLS_LLVM_EXEGESIS_BENCHMARKRUNNER_H
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