69 lines
2.3 KiB
C
69 lines
2.3 KiB
C
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//===-- SubprocessMemory.h --------------------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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///
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/// \file
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/// Defines a class that automatically handles auxiliary memory and the
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/// underlying shared memory backings for memory definitions
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///
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_TOOLS_LLVM_EXEGESIS_SUBPROCESSMEMORY_H
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#define LLVM_TOOLS_LLVM_EXEGESIS_SUBPROCESSMEMORY_H
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#include "BenchmarkResult.h"
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#include <string>
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#include <unordered_map>
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#include <vector>
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#ifdef _MSC_VER
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typedef int pid_t;
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#else
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#include <sys/types.h>
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#endif // _MSC_VER
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namespace llvm {
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namespace exegesis {
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class SubprocessMemory {
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public:
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static constexpr const size_t AuxiliaryMemoryOffset = 1;
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static constexpr const size_t AuxiliaryMemorySize = 4096;
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Error initializeSubprocessMemory(pid_t ProcessID);
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// The following function sets up memory definitions. It creates shared
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// memory objects for the definitions and fills them with the specified
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// values. Arguments: MemoryDefinitions - A map from memory value names to
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// MemoryValues, ProcessID - The ID of the current process.
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Error addMemoryDefinition(
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std::unordered_map<std::string, MemoryValue> MemoryDefinitions,
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pid_t ProcessID);
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// The following function sets up the auxiliary memory by opening shared
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// memory objects backing memory definitions and putting file descriptors
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// into appropriate places. Arguments: MemoryDefinitions - A map from memory
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// values names to Memoryvalues, ParentPID - The ID of the process that
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// setup the memory definitions, CounterFileDescriptor - The file descriptor
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// for the performance counter that will be placed in the auxiliary memory
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// section.
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static Expected<int> setupAuxiliaryMemoryInSubprocess(
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std::unordered_map<std::string, MemoryValue> MemoryDefinitions,
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pid_t ParentPID, int CounterFileDescriptor);
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~SubprocessMemory();
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private:
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std::vector<std::string> SharedMemoryNames;
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};
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} // namespace exegesis
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} // namespace llvm
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#endif
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