luaur-code-gen 0.1.3

Native (A64/X64) code generation for Luau (Rust).
Documentation 
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use crate::enums::size_x_64::SizeX64;
use crate::records::assembly_builder_x_64::AssemblyBuilderX64;
use crate::records::operand_x_64::OperandX64;
use crate::records::register_x_64::RegisterX64;

impl AssemblyBuilderX64 {
    pub fn bytes(
        &mut self,
        ptr: *const core::ffi::c_void,
        size: usize,
        align: usize,
    ) -> OperandX64 {
        let pos = {
            // AssemblyBuilderX64::bytes in C++ calls a private helper `allocateData`.
            // In Rust, that helper is currently not available as a method on this type.
            // Fall back to the known layout/fields on AssemblyBuilderX64 to preserve behavior.
            if self.data_pos < size {
                let old_size = self.data.len();
                self.data.resize(self.data.len() * 2, 0);

                unsafe {
                    core::ptr::copy_nonoverlapping(
                        self.data.as_ptr(),
                        self.data.as_mut_ptr().add(old_size),
                        old_size,
                    );
                    core::ptr::write_bytes(self.data.as_mut_ptr(), 0, old_size);
                }

                self.data_pos += old_size;
            }

            self.data_pos = (self.data_pos - size) & !(align - 1);
            self.data_pos
        };

        unsafe {
            core::ptr::copy_nonoverlapping(ptr as *const u8, self.data.as_mut_ptr().add(pos), size);
        }

        OperandX64::operand_x_64_size_x_64_register_x_64_u8_register_x_64_i32(
            SizeX64::none,
            RegisterX64::noreg,
            1,
            RegisterX64::rip,
            (pos as i32) - (self.data.len() as i32),
        )
    }
}