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import driver::session;
import front::ast;
import std::map::hashmap;
import std::option;
import std::option::some;
import std::option::none;
import std::_int;
import std::_vec;
import util::common;
import resolve::def_map;
type fn_id_of_local = std::map::hashmap[ast::def_id, ast::def_id];
type env = rec(mutable vec[ast::def_id] current_context, // fn or obj
def_map def_map,
fn_id_of_local idmap,
session::session sess);
fn current_context(&env e) -> ast::def_id {
ret e.current_context.(_vec::len(e.current_context) - 1u);
}
fn enter_item(@env e, &@ast::item i) {
alt (i.node) {
case (ast::item_fn(?name, _, _, ?id, _)) {
_vec::push(e.current_context, id);
}
case (ast::item_obj(?name, _, _, ?ids, _)) {
_vec::push(e.current_context, ids.ty);
}
case (_) {}
}
}
fn leave_item(@env e, &@ast::item i) {
alt (i.node) {
case (ast::item_fn(?name, _, _, ?id, _)) {
_vec::pop(e.current_context);
}
case (ast::item_obj(_, _, _, ?ids, _)) {
_vec::pop(e.current_context);
}
case (_) {}
}
}
fn walk_expr(@env e, &@ast::expr x) {
alt (x.node) {
case (ast::expr_for(?d, _, _, _)) {
alt (d.node) {
case (ast::decl_local(?local)) {
e.idmap.insert(local.id, current_context(*e));
}
case (_) { }
}
}
case (ast::expr_for_each(?d, _, _, _)) {
alt (d.node) {
case (ast::decl_local(?local)) {
e.idmap.insert(local.id, current_context(*e));
}
case (_) { }
}
}
case (ast::expr_path(?pt, ?ann)) {
auto local_id;
alt (e.def_map.get(ast::ann_tag(ann))) {
case (ast::def_local(?id)) { local_id = id; }
case (_) { ret; }
}
auto df = ast::def_id_of_def(e.def_map.get(ast::ann_tag(ann)));
auto def_context = e.idmap.get(df);
if (current_context(*e) != def_context) {
e.sess.span_err(x.span,
"attempted dynamic environment-capture");
}
}
case (_) { }
}
}
fn walk_block(@env e, &ast::block b) {
for (@ast::stmt st in b.node.stmts) {
alt (st.node) {
case (ast::stmt_decl(?d,_)) {
alt (d.node) {
case (ast::decl_local(?loc)) {
e.idmap.insert(loc.id, current_context(*e));
}
case (_) { }
}
}
case (_) { }
}
}
}
fn check_for_captures(session::session sess, @ast::crate crate, def_map dm) {
let vec[ast::def_id] curctx = vec();
auto env = @rec(mutable current_context = curctx,
def_map = dm,
idmap = common::new_def_hash[ast::def_id](),
sess = sess);
auto visitor = rec(visit_item_pre = bind enter_item(env, _),
visit_item_post = bind leave_item(env, _),
visit_block_pre = bind walk_block(env, _),
visit_expr_pre = bind walk_expr(env, _)
with walk::default_visitor());
walk::walk_crate(visitor, *crate);
}
// Local Variables:
// mode: rust
// fill-column: 78;
// indent-tabs-mode: nil
// c-basic-offset: 4
// buffer-file-coding-system: utf-8-unix
// compile-command: "make -k -C $RBUILD 2>&1 | sed -e 's/\\/x\\//x:\\//g'";
// End:
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