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55 lines
2.0 KiB
C++
55 lines
2.0 KiB
C++
// SPDX-License-Identifier: MIT
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#pragma once
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#include <FEXCore/fextl/memory.h>
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#include <chrono>
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#include <cstddef>
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#include <cstdint>
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#include <string_view>
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namespace FEXCore {
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// Buffered JIT symbol tracking.
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struct JITSymbolBuffer {
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// Maximum buffer size to ensure we are a page in size.
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constexpr static size_t BUFFER_SIZE = 4096 - (8 * 2);
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// Maximum distance until the end of the buffer to do a write.
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constexpr static size_t NEEDS_WRITE_DISTANCE = BUFFER_SIZE - 64;
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// Maximum time threshhold to wait before a buffer write occurs.
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constexpr static std::chrono::milliseconds MAXIMUM_THRESHOLD {100};
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JITSymbolBuffer()
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: LastWrite {std::chrono::steady_clock::now()} {}
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// stead_clock to ensure a monotonic increasing clock.
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// In highly stressed situations this can still cause >2% CPU time in vdso_clock_gettime.
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// If we need lower CPU time when JIT symbols are enabled then FEX can read the cycle counter directly.
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std::chrono::steady_clock::time_point LastWrite {};
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size_t Offset {};
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char Buffer[BUFFER_SIZE] {};
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};
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static_assert(sizeof(JITSymbolBuffer) == 4096, "Ensure this is one page in size");
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class JITSymbols final {
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public:
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JITSymbols();
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~JITSymbols();
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void InitFile();
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void RegisterNamedRegion(const void* HostAddr, uint32_t CodeSize, std::string_view Name);
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void RegisterJITSpace(const void* HostAddr, uint32_t CodeSize);
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// Allocate JIT buffer.
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static fextl::unique_ptr<FEXCore::JITSymbolBuffer> AllocateBuffer() {
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return fextl::make_unique<FEXCore::JITSymbolBuffer>();
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}
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void Register(FEXCore::JITSymbolBuffer* Buffer, const void* HostAddr, uint64_t GuestAddr, uint32_t CodeSize);
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void Register(FEXCore::JITSymbolBuffer* Buffer, const void* HostAddr, uint32_t CodeSize, std::string_view Name, uintptr_t Offset);
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void RegisterNamedRegion(FEXCore::JITSymbolBuffer* Buffer, const void* HostAddr, uint32_t CodeSize, std::string_view Name);
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private:
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int fd {-1};
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void WriteBuffer(FEXCore::JITSymbolBuffer* Buffer, bool ForceWrite = false);
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};
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} // namespace FEXCore
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