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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 util.common;
type fn_id_of_local = std.map.hashmap[ast.def_id, ast.def_id];
type env = rec(option.t[ast.def_id] current_context, // fn or obj
fn_id_of_local idmap,
session.session sess);
fn update_env_for_item(&env e, @ast.item i) -> env {
alt (i.node) {
case (ast.item_fn(?name, _, _, ?id, _)) {
ret rec(current_context = some(id) with e);
}
case (ast.item_obj(_, _, _, ?ids, _)) {
ret rec(current_context = some(ids.ty) with e);
}
case (_) {
ret e;
}
}
}
fn update_env_for_expr(&env e, @ast.expr x) -> env {
alt (x.node) {
case (ast.expr_for(?d, _, _, _)) {
alt (d.node) {
case (ast.decl_local(?local)) {
auto curr_context =
option.get[ast.def_id](e.current_context);
e.idmap.insert(local.id, curr_context);
}
case (_) {
}
}
}
case (ast.expr_for_each(?d, _, _, _)) {
alt (d.node) {
case (ast.decl_local(?local)) {
auto curr_context =
option.get[ast.def_id](e.current_context);
e.idmap.insert(local.id, curr_context);
}
case (_) {
}
}
}
case (_) { }
}
ret e;
}
fn update_env_for_block(&env e, &ast.block b) -> env {
auto curr_context = option.get[ast.def_id](e.current_context);
for each (@tup(ast.ident, ast.block_index_entry) it in
b.node.index.items()) {
alt (it._1) {
case (ast.bie_local(?local)) {
e.idmap.insert(local.id, curr_context);
}
case (_) {
}
}
}
ret e;
}
fn fold_expr_path(&env e, &ast.span sp, &ast.path p, &option.t[ast.def] d,
ast.ann a) -> @ast.expr {
auto local_id;
alt (option.get[ast.def](d)) {
case (ast.def_local(?id)) {
local_id = id;
}
case (_) {
ret @fold.respan[ast.expr_](sp, ast.expr_path(p, d, a));
}
}
auto curr_context = option.get[ast.def_id](e.current_context);
auto x = ast.def_id_of_def(option.get[ast.def](d));
auto def_context = option.get[ast.def_id](e.idmap.find(x));
if (curr_context != def_context) {
e.sess.span_err(sp, "attempted dynamic environment-capture");
}
ret @fold.respan[ast.expr_](sp, ast.expr_path(p, d, a));
}
fn check_for_captures(session.session sess, @ast.crate crate) {
let fold.ast_fold[env] fld = fold.new_identity_fold[env]();
fld = @rec( update_env_for_item = bind update_env_for_item(_,_),
update_env_for_block = bind update_env_for_block(_,_),
update_env_for_expr = bind update_env_for_expr(_,_),
fold_expr_path = bind fold_expr_path(_,_,_,_,_)
with *fld);
auto idmap = common.new_def_hash[ast.def_id]();
auto e = rec(current_context = none[ast.def_id], idmap = idmap,
sess = sess);
fold.fold_crate[env](e, fld, 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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