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rustc: Fix warn on unused import bug 

rustc generates incorrect warning for cascaded import declarations like:

  use std;
  import std::io;
  import io::println;
  fn main() { println("hello"); }

  warning: unused import io

A followup of issue #889
This commit is contained in:
Haitao Li 2011-11-17 12:03:35 +08:00 committed by Marijn Haverbeke
parent bfc81352aa
commit fe6484d3e6
1 changed files with 10 additions and 11 deletions
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21
src/comp/middle/resolve.rs
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@ -107,7 +107,8 @@ type env =
mod_map: hashmap<ast::node_id, @indexed_mod>,
ext_map: hashmap<def_id, [ident]>,
ext_cache: ext_hash,
mutable used_imports: option::t<[ast::node_id]>,
used_imports: {mutable track: bool,
mutable data: [ast::node_id]},
mutable reported: [{ident: str, sc: scope}],
mutable currently_resolving: node_id,
sess: session};
@ -129,7 +130,7 @@ fn resolve_crate(sess: session, amap: ast_map::map, crate: @ast::crate) ->
mod_map: new_int_hash::<@indexed_mod>(),
ext_map: new_def_hash::<[ident]>(),
ext_cache: new_ext_hash(),
mutable used_imports: none,
used_imports: {mutable track: false, mutable data: []},
mutable reported: [],
mutable currently_resolving: -1,
sess: sess};
@ -137,7 +138,6 @@ fn resolve_crate(sess: session, amap: ast_map::map, crate: @ast::crate) ->
resolve_imports(*e);
check_for_collisions(e, *crate);
check_bad_exports(e);
e.used_imports = some([]);
resolve_names(e, crate);
check_unused_imports(e);
ret {def_map: e.def_map, ext_map: e.ext_map};
@ -238,6 +238,7 @@ fn map_crate(e: @env, c: @ast::crate) {
}
fn resolve_imports(e: env) {
e.used_imports.track = true;
e.imports.values {|v|
alt v {
todo(node_id, name, path, span, scopes) {
@ -246,15 +247,15 @@ fn resolve_imports(e: env) {
resolved(_, _, _, _, _) { }
}
};
e.used_imports.track = false;
e.sess.abort_if_errors();
}
fn check_unused_imports(e: @env) {
let used = option::get(e.used_imports);
e.imports.items {|k, v|
alt v {
resolved(val, ty, md, name, sp) {
if !vec::member(k, used) {
if !vec::member(k, e.used_imports.data) {
e.sess.span_warn(sp, "unused import " + name);
}
}
@ -264,6 +265,7 @@ fn check_unused_imports(e: @env) {
}
fn resolve_names(e: @env, c: @ast::crate) {
e.used_imports.track = true;
let v =
@{visit_native_item: visit_native_item_with_scope,
visit_item: visit_item_with_scope,
@ -277,6 +279,7 @@ fn resolve_names(e: @env, c: @ast::crate) {
visit_fn: bind visit_fn_with_scope(e, _, _, _, _, _, _, _)
with *visit::default_visitor()};
visit::visit_crate(*c, cons(scope_crate, @nil), visit::mk_vt(v));
e.used_imports.track = false;
e.sess.abort_if_errors();
fn walk_expr(e: @env, exp: @ast::expr, sc: scopes, v: vt<scopes>) {
@ -950,12 +953,8 @@ fn lookup_import(e: env, defid: def_id, ns: namespace) -> option::t<def> {
ret none;
}
resolved(val, typ, md, _, _) {
alt e.used_imports {
none. { }
some(lst_) {
let lst = lst_ + [defid.node];
e.used_imports = option::some(lst);
}
if e.used_imports.track {
e.used_imports.data += [defid.node];
}
ret alt ns { ns_value. { val } ns_type. { typ } ns_module. { md } };
}