lemonlang 0.0.3

an experimental, modern, purely safe, programming language.
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use super::Builder;
use crate::{
	ast::{self},
	checker::types::TypeId,
	ir::{self, IrBasicValue},
	report::throw_ir_build_error,
};

type CalleeResolvedType = (String, Option<IrBasicValue>);

impl Builder<'_> {
	pub fn build_call_expr(&mut self, expr: &mut ast::CallExpr) -> IrBasicValue {
		let ret_type = self.build_type(expr.get_ret_type_id(), expr.get_range());
		let dest = self.ctx.new_register(ret_type);
		let (callee, self_value) = self.resolve_callee(expr);
		let mut args = self.build_function_args(&mut expr.args, &expr.args_type);

		if let Some(self_value) = self_value {
			args.insert(0, self_value);
		}

		if !ret_type.is_nothing() {
			if let Some(size) = self.is_need_heap_allocation(ret_type) {
				self.ctx.add_free_value(dest.clone());
				let unary_instr = ir::UnInstr::new(dest.clone(), size.into());
				self.ctx.block.add_instr(ir::Instr::Halloc(unary_instr));
			} else {
				let salloc = ir::SallocInstr::new(dest.clone(), ret_type);
				self.ctx.block.add_instr(salloc.into());
			}
		}
		let call_instr = ir::CallInstr::new(dest.clone(), callee, ret_type, args);
		self.ctx.block.add_instr(call_instr.into());
		dest
	}

	#[inline(always)]
	fn resolve_callee(&mut self, expr: &mut ast::CallExpr) -> CalleeResolvedType {
		match &mut *expr.callee {
			ast::Expr::Ident(ident) => (ident.lexeme().to_string(), None),
			ast::Expr::Associate(associate_expr) => self.resolve_associate_expr(associate_expr),
			ast::Expr::Member(member) => self.resolve_member_expr(member),
			_ => todo!("unrecognized callee: {:?}", expr.callee),
		}
	}

	#[inline(always)]
	fn resolve_associate_expr(&mut self, expr: &mut ast::AssociateExpr) -> CalleeResolvedType {
		let self_name = expr.self_name.lexeme();
		let method_name = expr.method.lexeme();
		(self.create_bind_method_with_selfname(self_name, method_name), None)
	}

	#[inline(always)]
	fn resolve_member_expr(&mut self, member: &mut ast::MemberExpr) -> CalleeResolvedType {
		self.ctx.push_member_scope();
		let self_value = self.build_expr(&mut member.left);
		let self_register = self_value.value.as_str();
		self.ctx.pop_scope();
		let self_name = match self.type_store.get_struct_name(self_value.get_type()) {
			Some(name) => name,
			None => {
				throw_ir_build_error(format!("cannot resolve struct name for type {}", self_register))
			}
		};
		let method_name = member.method.lexeme();
		let method = self.create_bind_method_with_selfname(self_name, method_name);
		(method, Some(self_value))
	}

	#[rustfmt::skip]
	fn build_function_args(&mut self, args_expr: &mut [ast::Expr], args_type: &[TypeId]) -> Vec<IrBasicValue> {
		let mut basic_values = Vec::with_capacity(args_type.len());
		for (position, expr) in args_expr.iter_mut().enumerate() {
			let mut basic_value = self.build_expr(expr);
			if let Some(expr_type) = args_type.get(position) {
				basic_value = basic_value.with_new_type(*expr_type)
			}
			basic_values.push(basic_value);
		}
		basic_values
	}

	// fn build_member_callee(&mut self, member: &ast::MemberExpr) -> String {
	// 	let left_type = self.build_type(member.left_type, member.get_range());
	// 	self.build_method_name(left_type, member.method.lexeme())
	// }

	// fn build_associate_callee(&mut self, associate: &ast::AssociateExpr) -> String {
	// 	let left_type = self.build_type(associate.left_type, associate.get_range());
	// 	self.build_method_name(left_type, associate.method.lexeme())
	// }

	// fn build_method_name(&mut self, type_id: TypeId, method: &str) -> String {
	// 	let type_name = self.type_store.get_struct_name(type_id);
	// 	self.create_bind_method_name(type_name, method)
	// }

	// #[inline(always)]
	// fn build_ident_callee(&mut self, ident: &ast::Ident, args_type: &[TypeId]) -> String {
	// let lexeme = ident.lexeme();
	// if let Some(monomorphic_calls) = self.type_store.monomorphic_store.get_fns(lexeme) {
	// 	if let Some(generics) = self.find_generic_function(&monomorphic_calls, args_type) {
	// 		return format!("{lexeme}_{}", self.create_hash_type(&generics));
	// 	}
	// }
	// throw_ir_build_error(format!("callee not found: '{lexeme}'"))
	// }

	// #[inline(always)]
	// pub fn create_bind_method_name(&self, self_name: &str, method_name: &str) -> String {
	// 	format!("{}__{}", self_name, method_name)
	// }

	// #[rustfmt::skip]
	// fn find_generic_function(&self, monos: &[FnType], args: &[TypeId]) -> Option<Vec<TypeId>> {
	// 	monos.iter().find(|mono| mono.generics.iter().zip(args).all(|(g, a)| g == a))
	// 		.map(|mono| mono.generics.clone())
	// }

	// #[inline(always)]
	// pub fn create_hash_type(&mut self, generics: &[TypeId]) -> String {
	// 	let mut hasher = DefaultHasher::new();
	// 	for generic in generics {
	// 		hasher.write_u64(generic.0);
	// 	}
	// 	let hash_value = hasher.finish();
	// 	// todo:  improve this...  maybe move 16 bits to 32 or more? humm...
	// 	format!("{:04x}", (hash_value & 0xFFFF))
	// }
}