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Connor McLaughlin
2019-09-09 17:01:26 +10:00
commit 2149ab4d69
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src/common/jit_code_buffer.cpp Normal file
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#include "jit_code_buffer.h"
#include "YBaseLib/Assert.h"
#if defined(Y_PLATFORM_WINDOWS)
#include "YBaseLib/Windows/WindowsHeaders.h"
#elif defined(Y_PLATFORM_LINUX) || defined(Y_PLATFORM_ANDROID)
#include <sys/mman.h>
#endif
JitCodeBuffer::JitCodeBuffer(size_t size)
{
#if defined(Y_PLATFORM_WINDOWS)
m_code_ptr = VirtualAlloc(nullptr, size, MEM_COMMIT, PAGE_EXECUTE_READWRITE);
#elif defined(Y_PLATFORM_LINUX) || defined(Y_PLATFORM_ANDROID)
m_code_ptr = mmap(nullptr, size, PROT_READ | PROT_WRITE | PROT_EXEC, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
#else
m_code_ptr = nullptr;
#endif
m_free_code_ptr = m_code_ptr;
m_code_size = size;
m_code_used = 0;
if (!m_code_ptr)
Panic("Failed to allocate code space.");
}
JitCodeBuffer::~JitCodeBuffer()
{
#if defined(Y_PLATFORM_WINDOWS)
VirtualFree(m_code_ptr, m_code_size, MEM_RELEASE);
#elif defined(Y_PLATFORM_LINUX) || defined(Y_PLATFORM_ANDROID)
munmap(m_code_ptr, m_code_size);
#endif
}
void JitCodeBuffer::CommitCode(size_t length)
{
// // Function alignment?
// size_t extra_bytes = ((length % 16) != 0) ? (16 - (length % 16)) : 0;
// for (size_t i = 0; i < extra_bytes; i++)
// reinterpret_cast<char*>(m_free_code_ptr)[i] = 0xCC;
Assert(length <= (m_code_size - m_code_used));
m_free_code_ptr = reinterpret_cast<char*>(m_free_code_ptr) + length;
m_code_used += length;
}
void JitCodeBuffer::Reset()
{
#if defined(Y_PLATFORM_WINDOWS)
FlushInstructionCache(GetCurrentProcess(), m_code_ptr, m_code_size);
#elif defined(Y_PLATFORM_LINUX) || defined(Y_PLATFORM_ANDROID)
// TODO
#endif
m_free_code_ptr = m_code_ptr;
m_code_used = 0;
}
void JitCodeBuffer::Align(u32 alignment, u8 padding_value)
{
DebugAssert(Common::IsPow2(alignment));
const size_t num_padding_bytes =
std::min(static_cast<size_t>(Common::AlignUpPow2(reinterpret_cast<uintptr_t>(m_free_code_ptr), alignment) -
reinterpret_cast<uintptr_t>(m_free_code_ptr)),
GetFreeCodeSpace());
std::memset(m_free_code_ptr, padding_value, num_padding_bytes);
m_free_code_ptr = reinterpret_cast<char*>(m_free_code_ptr) + num_padding_bytes;
m_code_used += num_padding_bytes;
}