luaur-code-gen 0.1.0

Native (A64/X64) code generation for Luau (Rust).
Documentation 
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use crate::enums::arch::Arch;
use crate::functions::build_entry_function_code_gen_a_64::build_entry_function_assembly_builder_a_64_unwind_builder;
use crate::macros::codegen_assert::CODEGEN_ASSERT;
use crate::records::assembly_builder_a_64::AssemblyBuilderA64;
use crate::records::base_code_gen_context::BaseCodeGenContext;
use crate::records::unwind_builder::UnwindBuilder;
use alloc::string::String;
use alloc::vec::Vec;

pub fn init_header_functions(code_gen_context: &mut BaseCodeGenContext) -> bool {
    let mut build = AssemblyBuilderA64 {
        data: Vec::new(),
        code: Vec::new(),
        text: String::new(),
        log_text: false,
        features: 0,
        next_label: 1,
        pending_labels: Vec::new(),
        label_locations: Vec::new(),
        finalized: false,
        overflowed: false,
        data_pos: 0,
        code_pos: core::ptr::null_mut(),
        code_end: core::ptr::null_mut(),
    };
    build.assembly_builder_a_64_assembly_builder_a_64(false, 0);

    unsafe {
        start_info(&mut *code_gen_context.unwind_builder, Arch::A64);
    }

    let entry_locations = unsafe {
        build_entry_function_assembly_builder_a_64_unwind_builder(
            &mut build,
            &mut *code_gen_context.unwind_builder,
        )
    };

    build.finalize();

    unsafe {
        finish_info(&mut *code_gen_context.unwind_builder);
    }

    CODEGEN_ASSERT!(build.data.is_empty());

    let mut code_start: *mut u8 = core::ptr::null_mut();
    let code_ptr = build.code.as_ptr().cast::<u8>();
    let code_size = build.code.len() * core::mem::size_of::<u32>();

    if luaur_common::FFlag::LuauCodegenFreeBlocks.get() {
        code_gen_context.gate_allocation_data = code_gen_context.code_allocator.allocate(
            build.data.as_ptr(),
            build.data.len(),
            code_ptr,
            code_size,
        );

        if code_gen_context.gate_allocation_data.start.is_null() {
            return false;
        }

        code_start = code_gen_context.gate_allocation_data.code_start;
    } else if !code_gen_context.code_allocator.allocate_deprecated(
        build.data.as_ptr(),
        build.data.len(),
        code_ptr,
        code_size,
        &mut code_gen_context.gate_data_deprecated,
        &mut code_gen_context.gate_data_size_deprecated,
        &mut code_start,
    ) {
        return false;
    }

    unsafe {
        set_begin_offset(
            &mut *code_gen_context.unwind_builder,
            build.get_label_offset(&entry_locations.prologueEnd) as usize,
        );

        code_gen_context.context.gateEntry =
            code_start.add(build.get_label_offset(&entry_locations.start) as usize);
        code_gen_context.context.gateExit =
            code_start.add(build.get_label_offset(&entry_locations.epilogueStart) as usize);
    }

    true
}

#[cfg(target_os = "windows")]
unsafe fn start_info(unwind: &mut UnwindBuilder, arch: Arch) {
    (&mut *(unwind as *mut UnwindBuilder)
        .cast::<crate::records::unwind_builder_win::UnwindBuilderWin>())
        .start_info(arch);
}

#[cfg(not(target_os = "windows"))]
unsafe fn start_info(unwind: &mut UnwindBuilder, arch: Arch) {
    (&mut *(unwind as *mut UnwindBuilder)
        .cast::<crate::records::unwind_builder_dwarf_2::UnwindBuilderDwarf2>())
        .start_info(arch);
}

#[cfg(target_os = "windows")]
unsafe fn finish_info(unwind: &mut UnwindBuilder) {
    (&mut *(unwind as *mut UnwindBuilder)
        .cast::<crate::records::unwind_builder_win::UnwindBuilderWin>())
        .finish_info();
}

#[cfg(not(target_os = "windows"))]
unsafe fn finish_info(unwind: &mut UnwindBuilder) {
    (&mut *(unwind as *mut UnwindBuilder)
        .cast::<crate::records::unwind_builder_dwarf_2::UnwindBuilderDwarf2>())
        .finish_info();
}

#[cfg(target_os = "windows")]
unsafe fn set_begin_offset(unwind: &mut UnwindBuilder, begin_offset: usize) {
    (&mut *(unwind as *mut UnwindBuilder)
        .cast::<crate::records::unwind_builder_win::UnwindBuilderWin>())
        .set_begin_offset(begin_offset);
}

#[cfg(not(target_os = "windows"))]
unsafe fn set_begin_offset(unwind: &mut UnwindBuilder, begin_offset: usize) {
    (&mut *(unwind as *mut UnwindBuilder)
        .cast::<crate::records::unwind_builder_dwarf_2::UnwindBuilderDwarf2>())
        .set_begin_offset(begin_offset);
}