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//===-- SubprocessMemory.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 a class that automatically handles auxiliary memory and the
/// underlying shared memory backings for memory definitions
///
//===----------------------------------------------------------------------===//
#ifndef LLVM_TOOLS_LLVM_EXEGESIS_SUBPROCESSMEMORY_H
#define LLVM_TOOLS_LLVM_EXEGESIS_SUBPROCESSMEMORY_H
#include "BenchmarkResult.h"
#include <string>
#include <unordered_map>
#include <vector>
#ifdef _MSC_VER
typedef int pid_t;
#else
#include <sys/types.h>
#endif // _MSC_VER
namespace llvm {
namespace exegesis {
class SubprocessMemory {
public:
static constexpr const size_t AuxiliaryMemoryOffset = 1;
static constexpr const size_t AuxiliaryMemorySize = 4096;
// Gets the thread ID for the calling thread.
static long getCurrentTID();
Error initializeSubprocessMemory(pid_t ProcessID);
// The following function sets up memory definitions. It creates shared
// memory objects for the definitions and fills them with the specified
// values. Arguments: MemoryDefinitions - A map from memory value names to
// MemoryValues, ProcessID - The ID of the current process.
Error addMemoryDefinition(
std::unordered_map<std::string, MemoryValue> MemoryDefinitions,
pid_t ProcessID);
// The following function sets up the auxiliary memory by opening shared
// memory objects backing memory definitions and putting file descriptors
// into appropriate places. Arguments: MemoryDefinitions - A map from memory
// values names to Memoryvalues, ParentPID - The ID of the process that
// setup the memory definitions, CounterFileDescriptor - The file descriptor
// for the performance counter that will be placed in the auxiliary memory
// section.
static Expected<int> setupAuxiliaryMemoryInSubprocess(
std::unordered_map<std::string, MemoryValue> MemoryDefinitions,
pid_t ParentPID, long ParentTID, int CounterFileDescriptor);
~SubprocessMemory();
private:
std::vector<std::string> SharedMemoryNames;
};
} // namespace exegesis
} // namespace llvm
#endif
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