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use std::cell::RefCell;

use rustc_data_structures::fx::FxHashMap;
use rustc_middle::mir::mono::CodegenUnit;
use rustc_middle::ty::{self, Instance, Ty};
use rustc_session::Session;

use super::BackendTypes;

pub trait MiscMethods<'tcx>: BackendTypes {
    fn vtables(
        &self,
    ) -> &RefCell<FxHashMap<(Ty<'tcx>, Option<ty::PolyExistentialTraitRef<'tcx>>), Self::Value>>;
    fn apply_vcall_visibility_metadata(
        &self,
        _ty: Ty<'tcx>,
        _poly_trait_ref: Option<ty::PolyExistentialTraitRef<'tcx>>,
        _vtable: Self::Value,
    ) {
    }
    fn get_fn(&self, instance: Instance<'tcx>) -> Self::Function;
    fn get_fn_addr(&self, instance: Instance<'tcx>) -> Self::Value;
    fn eh_personality(&self) -> Self::Value;
    fn sess(&self) -> &Session;
    fn codegen_unit(&self) -> &'tcx CodegenUnit<'tcx>;
    fn set_frame_pointer_type(&self, llfn: Self::Function);
    fn apply_target_cpu_attr(&self, llfn: Self::Function);
    /// Declares the extern "C" main function for the entry point. Returns None if the symbol already exists.
    fn declare_c_main(&self, fn_type: Self::Type) -> Option<Self::Function>;
}