ECMAVirtualMachineJIT.hpp

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/*
 * =====================================================================
 *
 *          Photon
 *          Copyright Amlal EL Mahrouss, all rights reserved.
 *
 * =====================================================================
 */
 
#pragma once
 
#ifndef _WIN32
 
#include <core/Core.hpp>
#include <stdarg.h>
#include <sys/mman.h>
 
namespace Photon
{
    typedef void (*photon_asm_fn_t)(void* arg, size_t arg_cnt);
 
    inline int photon_delete_chunk(char* fn, size_t size)
    {
        if (!fn || !size)
            return 1;
 
        return munmap(fn, size);
    }
 
    inline photon_asm_fn_t photon_allocate_chunk(char* data, size_t size)
    {
        if (!data || !size)
        {
            throw Photon::BrowserError("JIT_ARGUMENT_INVALID");
        }
 
        char* mem_exec = (char*)mmap(NULL, // address
                                     4096, // size
                                     PROT_READ | PROT_WRITE | PROT_EXEC, MAP_PRIVATE | MAP_ANONYMOUS,
                                     -1, // fd (not used here)
                                     0); // offset (not used here)
 
        if (mem_exec == MAP_FAILED)
        {
            throw Photon::BrowserError("JIT_ERROR_OUT_OF_MEMORY");
            return nullptr;
        }
 
        memcpy(mem_exec, data, size);
 
        return (photon_asm_fn_t)mem_exec;
    }
} // namespace Photon
 
#endif // !_WIN32