76 lines
2.6 KiB
Rust
76 lines
2.6 KiB
Rust
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// A pass that checks to make sure private fields and methods aren't used
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// outside their scopes.
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use /*mod*/ syntax::ast;
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use /*mod*/ syntax::visit;
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use syntax::ast::{expr_field, ident, item_class, local_crate, node_id};
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use syntax::ast::{private};
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use ty::ty_class;
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use core::util::ignore;
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use dvec::DVec;
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use send_map::linear::LinearMap;
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fn check_crate(tcx: ty::ctxt, crate: @ast::crate) {
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let privileged_structs = @DVec();
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let add_privileged_structs = |items: &[@ast::item]| {
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let mut count = 0;
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for items.each |item| {
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match item.node {
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item_class(*) => {
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privileged_structs.push(item.id);
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count += 1;
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}
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_ => {}
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}
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}
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count
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};
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let visitor = visit::mk_vt(@{
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visit_mod: |the_module, span, node_id, env, visitor| {
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let n_added = add_privileged_structs(the_module.items);
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visit::visit_mod(the_module, span, node_id, env, visitor);
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for n_added.times {
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ignore(privileged_structs.pop());
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}
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},
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visit_expr: |expr, env, visitor| {
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match expr.node {
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expr_field(base, ident, _) => {
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match ty::get(ty::expr_ty(tcx, base)).struct {
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ty_class(id, _)
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if id.crate != local_crate ||
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!privileged_structs.contains(id.node) => {
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let fields = ty::lookup_class_fields(tcx, id);
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for fields.each |field| {
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if field.ident != ident { again; }
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if field.vis == private {
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tcx.sess.span_err(expr.span,
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fmt!("field `%s` is \
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private",
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*tcx.sess
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.parse_sess
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.interner
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.get(ident)));
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}
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break;
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}
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}
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_ => {}
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}
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}
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_ => {}
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}
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visit::visit_expr(expr, env, visitor);
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}
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with *visit::default_visitor()
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});
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visit::visit_crate(*crate, (), visitor);
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}
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