luaur-code-gen 0.1.1

Native (A64/X64) code generation for Luau (Rust).
Documentation 
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use crate::macros::codegen_assert::CODEGEN_ASSERT;
use crate::records::code_allocator::CodeAllocator;

#[allow(non_snake_case)]
pub fn make_pages_read_only(mem: *mut u8, size: usize) -> bool {
    CODEGEN_ASSERT!(CodeAllocator::align_to_page_size(mem as usize) == mem as usize);
    CODEGEN_ASSERT!(size == CodeAllocator::align_to_page_size(size));

    #[cfg(target_os = "windows")]
    {
        use core::ffi::c_void;
        use windows_sys::Win32::System::Memory::{VirtualProtect, PAGE_READONLY};

        let mut old_protect: u32 = 0;
        unsafe { VirtualProtect(mem as *const c_void, size, PAGE_READONLY, &mut old_protect) != 0 }
    }

    #[cfg(target_os = "linux")]
    {
        use core::ffi::c_int;
        use core::ffi::c_void;

        extern "C" {
            fn mprotect(addr: *mut c_void, len: usize, prot: c_int) -> c_int;
        }

        const PROT_READ: c_int = 0x1;

        unsafe { mprotect(mem as *mut c_void, size, PROT_READ) == 0 }
    }

    #[cfg(target_os = "macos")]
    {
        use core::ffi::c_int;
        use core::ffi::c_void;

        extern "C" {
            fn mprotect(addr: *mut c_void, len: usize, prot: c_int) -> c_int;
        }

        const PROT_READ: c_int = 0x1;

        unsafe { mprotect(mem as *mut c_void, size, PROT_READ) == 0 }
    }

    #[cfg(target_os = "freebsd")]
    {
        use core::ffi::c_int;
        use core::ffi::c_void;

        extern "C" {
            fn mprotect(addr: *mut c_void, len: usize, prot: c_int) -> c_int;
        }

        const PROT_READ: c_int = 0x1;

        unsafe { mprotect(mem as *mut c_void, size, PROT_READ) == 0 }
    }

    #[cfg(not(any(
        target_os = "windows",
        target_os = "linux",
        target_os = "macos",
        target_os = "freebsd"
    )))]
    {
        false
    }
}