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71 lines
2.1 KiB
C++
71 lines
2.1 KiB
C++
#include "jit_code_buffer.h"
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#include "YBaseLib/Assert.h"
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#if defined(Y_PLATFORM_WINDOWS)
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#include "YBaseLib/Windows/WindowsHeaders.h"
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#elif defined(Y_PLATFORM_LINUX) || defined(Y_PLATFORM_ANDROID)
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#include <sys/mman.h>
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#endif
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JitCodeBuffer::JitCodeBuffer(size_t size)
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{
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#if defined(Y_PLATFORM_WINDOWS)
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m_code_ptr = VirtualAlloc(nullptr, size, MEM_COMMIT, PAGE_EXECUTE_READWRITE);
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#elif defined(Y_PLATFORM_LINUX) || defined(Y_PLATFORM_ANDROID)
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m_code_ptr = mmap(nullptr, size, PROT_READ | PROT_WRITE | PROT_EXEC, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
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#else
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m_code_ptr = nullptr;
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#endif
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m_free_code_ptr = m_code_ptr;
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m_code_size = size;
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m_code_used = 0;
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if (!m_code_ptr)
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Panic("Failed to allocate code space.");
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}
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JitCodeBuffer::~JitCodeBuffer()
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{
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#if defined(Y_PLATFORM_WINDOWS)
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VirtualFree(m_code_ptr, m_code_size, MEM_RELEASE);
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#elif defined(Y_PLATFORM_LINUX) || defined(Y_PLATFORM_ANDROID)
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munmap(m_code_ptr, m_code_size);
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#endif
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}
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void JitCodeBuffer::CommitCode(size_t length)
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{
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// // Function alignment?
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// size_t extra_bytes = ((length % 16) != 0) ? (16 - (length % 16)) : 0;
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// for (size_t i = 0; i < extra_bytes; i++)
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// reinterpret_cast<char*>(m_free_code_ptr)[i] = 0xCC;
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Assert(length <= (m_code_size - m_code_used));
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m_free_code_ptr = reinterpret_cast<char*>(m_free_code_ptr) + length;
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m_code_used += length;
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}
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void JitCodeBuffer::Reset()
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{
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#if defined(Y_PLATFORM_WINDOWS)
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FlushInstructionCache(GetCurrentProcess(), m_code_ptr, m_code_size);
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#elif defined(Y_PLATFORM_LINUX) || defined(Y_PLATFORM_ANDROID)
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// TODO
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#endif
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m_free_code_ptr = m_code_ptr;
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m_code_used = 0;
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}
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void JitCodeBuffer::Align(u32 alignment, u8 padding_value)
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{
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DebugAssert(Common::IsPow2(alignment));
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const size_t num_padding_bytes =
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std::min(static_cast<size_t>(Common::AlignUpPow2(reinterpret_cast<uintptr_t>(m_free_code_ptr), alignment) -
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reinterpret_cast<uintptr_t>(m_free_code_ptr)),
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GetFreeCodeSpace());
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std::memset(m_free_code_ptr, padding_value, num_padding_bytes);
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m_free_code_ptr = reinterpret_cast<char*>(m_free_code_ptr) + num_padding_bytes;
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m_code_used += num_padding_bytes;
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}
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