leo_passes/type_checking/
mod.rs

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// Copyright (C) 2019-2025 Provable Inc.
// This file is part of the Leo library.

// The Leo library is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// The Leo library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with the Leo library. If not, see <https://www.gnu.org/licenses/>.

pub mod check_expressions;

pub mod check_program;

pub mod check_statements;

pub mod checker;

mod scope_state;

pub use checker::*;

use crate::{CallGraph, Pass, StructGraph, SymbolTable, TypeTable};

use leo_ast::{Ast, ProgramVisitor};
use leo_errors::{Result, emitter::Handler};

impl<'a> Pass for TypeChecker<'a> {
    type Input = (&'a Ast, &'a Handler, &'a mut SymbolTable, &'a TypeTable, NetworkLimits);
    type Output = Result<(StructGraph, CallGraph)>;

    fn do_pass((ast, handler, symbol_table, type_table, limits): Self::Input) -> Self::Output {
        let mut visitor = TypeChecker::new(symbol_table, type_table, handler, limits);
        visitor.visit_program(ast.as_repr());
        handler.last_err().map_err(|e| *e)?;

        // Remove unused structs from the struct graph.
        // This prevents unused struct definitions from being included in the generated bytecode.
        visitor.struct_graph.retain_nodes(&visitor.used_structs);
        Ok((visitor.struct_graph, visitor.call_graph))
    }
}