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// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
// This compiler pass detects static items that refer to themselves
// recursively.
use ast_map;
use session::Session;
use middle::def::{DefStatic, DefConst, DefAssociatedConst, DefMap};
use syntax::{ast, ast_util};
use syntax::codemap::Span;
use syntax::visit::Visitor;
use syntax::visit;
struct CheckCrateVisitor<'a, 'ast: 'a> {
sess: &'a Session,
def_map: &'a DefMap,
ast_map: &'a ast_map::Map<'ast>
}
impl<'v, 'a, 'ast> Visitor<'v> for CheckCrateVisitor<'a, 'ast> {
fn visit_item(&mut self, it: &ast::Item) {
match it.node {
ast::ItemStatic(_, _, ref expr) |
ast::ItemConst(_, ref expr) => {
let mut recursion_visitor =
CheckItemRecursionVisitor::new(self, &it.span);
recursion_visitor.visit_item(it);
visit::walk_expr(self, &*expr)
},
_ => visit::walk_item(self, it)
}
}
fn visit_trait_item(&mut self, ti: &ast::TraitItem) {
match ti.node {
ast::ConstTraitItem(_, ref default) => {
if let Some(ref expr) = *default {
let mut recursion_visitor =
CheckItemRecursionVisitor::new(self, &ti.span);
recursion_visitor.visit_trait_item(ti);
visit::walk_expr(self, &*expr)
}
}
_ => visit::walk_trait_item(self, ti)
}
}
fn visit_impl_item(&mut self, ii: &ast::ImplItem) {
match ii.node {
ast::ConstImplItem(_, ref expr) => {
let mut recursion_visitor =
CheckItemRecursionVisitor::new(self, &ii.span);
recursion_visitor.visit_impl_item(ii);
visit::walk_expr(self, &*expr)
}
_ => visit::walk_impl_item(self, ii)
}
}
}
pub fn check_crate<'ast>(sess: &Session,
krate: &ast::Crate,
def_map: &DefMap,
ast_map: &ast_map::Map<'ast>) {
let mut visitor = CheckCrateVisitor {
sess: sess,
def_map: def_map,
ast_map: ast_map
};
visit::walk_crate(&mut visitor, krate);
sess.abort_if_errors();
}
struct CheckItemRecursionVisitor<'a, 'ast: 'a> {
root_span: &'a Span,
sess: &'a Session,
ast_map: &'a ast_map::Map<'ast>,
def_map: &'a DefMap,
idstack: Vec<ast::NodeId>
}
impl<'a, 'ast: 'a> CheckItemRecursionVisitor<'a, 'ast> {
fn new(v: &CheckCrateVisitor<'a, 'ast>, span: &'a Span)
-> CheckItemRecursionVisitor<'a, 'ast> {
CheckItemRecursionVisitor {
root_span: span,
sess: v.sess,
ast_map: v.ast_map,
def_map: v.def_map,
idstack: Vec::new()
}
}
fn with_item_id_pushed<F>(&mut self, id: ast::NodeId, f: F)
where F: Fn(&mut Self) {
if self.idstack.iter().any(|x| x == &(id)) {
span_err!(self.sess, *self.root_span, E0265, "recursive constant");
return;
}
self.idstack.push(id);
f(self);
self.idstack.pop();
}
}
impl<'a, 'ast, 'v> Visitor<'v> for CheckItemRecursionVisitor<'a, 'ast> {
fn visit_item(&mut self, it: &ast::Item) {
self.with_item_id_pushed(it.id, |v| visit::walk_item(v, it));
}
fn visit_trait_item(&mut self, ti: &ast::TraitItem) {
self.with_item_id_pushed(ti.id, |v| visit::walk_trait_item(v, ti));
}
fn visit_impl_item(&mut self, ii: &ast::ImplItem) {
self.with_item_id_pushed(ii.id, |v| visit::walk_impl_item(v, ii));
}
fn visit_expr(&mut self, e: &ast::Expr) {
match e.node {
ast::ExprPath(..) => {
match self.def_map.borrow().get(&e.id).map(|d| d.base_def) {
Some(DefStatic(def_id, _)) |
Some(DefAssociatedConst(def_id, _)) |
Some(DefConst(def_id)) if
ast_util::is_local(def_id) => {
match self.ast_map.get(def_id.node) {
ast_map::NodeItem(item) =>
self.visit_item(item),
ast_map::NodeTraitItem(item) =>
self.visit_trait_item(item),
ast_map::NodeImplItem(item) =>
self.visit_impl_item(item),
ast_map::NodeForeignItem(_) => {},
_ => {
span_err!(self.sess, e.span, E0266,
"expected item, found {}",
self.ast_map.node_to_string(def_id.node));
return;
},
}
}
_ => ()
}
},
_ => ()
}
visit::walk_expr(self, e);
}
}
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