a7e1a35f88
Aligning the type parameters of the ifaces, impls, and methods correctly in typeck is almost brain surgery. Seems to work now for everything I threw at it, but might still break in other corner cases. Issue #1227
1869 lines
61 KiB
Rust
1869 lines
61 KiB
Rust
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import syntax::{ast, ast_util, codemap};
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import syntax::ast::*;
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import ast::{ident, fn_ident, def, def_id, node_id};
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import syntax::ast_util::{local_def, def_id_of_def, is_exported};
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import metadata::{csearch, cstore};
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import driver::session::session;
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import util::common::*;
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import std::map::{new_int_hash, new_str_hash};
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import syntax::codemap::span;
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import syntax::visit;
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import visit::vt;
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import core::{vec, option, str};
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import std::list;
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import std::map::hashmap;
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import std::list::{list, nil, cons};
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import option::{some, none, is_none, is_some};
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import syntax::print::pprust::*;
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export resolve_crate;
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export def_map, ext_map, exp_map, impl_map;
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export _impl, iscopes, method_info;
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// Resolving happens in two passes. The first pass collects defids of all
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// (internal) imports and modules, so that they can be looked up when needed,
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// and then uses this information to resolve the imports. The second pass
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// locates all names (in expressions, types, and alt patterns) and resolves
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// them, storing the resulting def in the AST nodes.
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tag scope {
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scope_crate;
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scope_item(@ast::item);
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scope_bare_fn(ast::fn_decl, node_id, [ast::ty_param]);
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scope_fn_expr(ast::fn_decl, node_id, [ast::ty_param]);
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scope_native_item(@ast::native_item);
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scope_loop(@ast::local); // there's only 1 decl per loop.
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scope_block(ast::blk, @mutable uint, @mutable uint);
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scope_arm(ast::arm);
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scope_method(ast::node_id, [ast::ty_param]);
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}
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type scopes = list<scope>;
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tag import_state {
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todo(ast::node_id, ast::ident, @[ast::ident], codemap::span, scopes);
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is_glob(@[ast::ident], scopes, codemap::span);
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resolving(span);
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resolved(option::t<def>, /* value */
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option::t<def>, /* type */
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option::t<def>, /* module */
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@[@_impl], /* impls */
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/* used for reporting unused import warning */
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ast::ident, codemap::span);
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}
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tag glob_import_state {
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glob_resolving(span);
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glob_resolved(option::t<def>, /* value */
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option::t<def>, /* type */
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option::t<def>); /* module */
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}
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type ext_hash = hashmap<{did: def_id, ident: str, ns: namespace}, def>;
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fn new_ext_hash() -> ext_hash {
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type key = {did: def_id, ident: str, ns: namespace};
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fn hash(v: key) -> uint {
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ret str::hash(v.ident) + util::common::hash_def(v.did) +
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alt v.ns {
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ns_value. { 1u }
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ns_type. { 2u }
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ns_module. { 3u }
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};
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}
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fn eq(v1: key, v2: key) -> bool {
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ret util::common::def_eq(v1.did, v2.did) &&
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str::eq(v1.ident, v2.ident) && v1.ns == v2.ns;
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}
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ret std::map::mk_hashmap::<key, def>(hash, eq);
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}
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fn new_exp_hash() -> exp_map {
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type key = {path: str, ns: namespace};
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fn hash(v: key) -> uint {
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ret str::hash(v.path) +
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alt v.ns {
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ns_value. { 1u }
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ns_type. { 2u }
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ns_module. { 3u }
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};
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}
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fn eq(v1: key, v2: key) -> bool {
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ret str::eq(v1.path, v2.path) && v1.ns == v2.ns;
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}
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ret std::map::mk_hashmap::<key, def>(hash, eq);
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}
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tag mod_index_entry {
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mie_view_item(@ast::view_item);
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mie_import_ident(node_id, codemap::span);
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mie_item(@ast::item);
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mie_native_item(@ast::native_item);
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mie_tag_variant(/* tag item */@ast::item, /* variant index */uint);
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}
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type mod_index = hashmap<ident, list<mod_index_entry>>;
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// A tuple of an imported def and the import stmt that brung it
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type glob_imp_def = {def: def, item: @ast::view_item};
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type indexed_mod = {
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m: option::t<ast::_mod>,
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index: mod_index,
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mutable glob_imports: [glob_imp_def],
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glob_imported_names: hashmap<str, glob_import_state>,
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path: str
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};
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/* native modules can't contain tags, and we don't store their ASTs because we
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only need to look at them to determine exports, which they can't control.*/
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type def_map = hashmap<node_id, def>;
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type ext_map = hashmap<def_id, [ident]>;
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type exp_map = hashmap<{path: str, ns: namespace}, def>;
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type impl_map = hashmap<node_id, iscopes>;
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type impl_cache = hashmap<def_id, @[@_impl]>;
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type env =
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{cstore: cstore::cstore,
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def_map: def_map,
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ast_map: ast_map::map,
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imports: hashmap<ast::node_id, import_state>,
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exp_map: exp_map,
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mod_map: hashmap<ast::node_id, @indexed_mod>,
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block_map: hashmap<ast::node_id, [glob_imp_def]>,
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ext_map: ext_map,
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impl_map: impl_map,
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impl_cache: impl_cache,
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ext_cache: ext_hash,
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used_imports: {mutable track: bool,
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mutable data: [ast::node_id]},
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mutable reported: [{ident: str, sc: scope}],
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mutable ignored_imports: [node_id],
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sess: session};
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// Used to distinguish between lookups from outside and from inside modules,
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// since export restrictions should only be applied for the former.
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tag dir { inside; outside; }
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tag namespace { ns_value; ns_type; ns_module; }
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fn resolve_crate(sess: session, amap: ast_map::map, crate: @ast::crate) ->
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{def_map: def_map, exp_map: exp_map, impl_map: impl_map} {
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let e =
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@{cstore: sess.get_cstore(),
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def_map: new_int_hash(),
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ast_map: amap,
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imports: new_int_hash(),
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exp_map: new_exp_hash(),
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mod_map: new_int_hash(),
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block_map: new_int_hash(),
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ext_map: new_def_hash(),
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impl_map: new_int_hash(),
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impl_cache: new_def_hash(),
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ext_cache: new_ext_hash(),
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used_imports: {mutable track: false, mutable data: []},
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mutable reported: [],
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mutable ignored_imports: [],
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sess: sess};
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map_crate(e, crate);
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resolve_imports(*e);
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check_for_collisions(e, *crate);
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check_exports(e);
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resolve_names(e, crate);
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resolve_impls(e, crate);
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if sess.get_opts().warn_unused_imports {
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check_unused_imports(e);
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}
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ret {def_map: e.def_map, exp_map: e.exp_map, impl_map: e.impl_map};
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}
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// Locate all modules and imports and index them, so that the next passes can
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// resolve through them.
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fn map_crate(e: @env, c: @ast::crate) {
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// First, find all the modules, and index the names that they contain
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let v_map_mod =
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@{visit_view_item: bind index_vi(e, _, _, _),
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visit_item: bind index_i(e, _, _, _),
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visit_block: visit_block_with_scope
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with *visit::default_visitor::<scopes>()};
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visit::visit_crate(*c, cons(scope_crate, @nil), visit::mk_vt(v_map_mod));
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// Register the top-level mod
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e.mod_map.insert(ast::crate_node_id,
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@{m: some(c.node.module),
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index: index_mod(c.node.module),
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mutable glob_imports: [],
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glob_imported_names: new_str_hash(),
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path: ""});
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fn index_vi(e: @env, i: @ast::view_item, sc: scopes, _v: vt<scopes>) {
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alt i.node {
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ast::view_item_import(name, ids, id) {
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e.imports.insert(id, todo(id, name, ids, i.span, sc));
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}
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ast::view_item_import_from(mod_path, idents, id) {
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for ident in idents {
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e.imports.insert(ident.node.id,
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todo(ident.node.id, ident.node.name,
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@(*mod_path + [ident.node.name]),
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ident.span, sc));
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}
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}
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ast::view_item_import_glob(pth, id) {
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e.imports.insert(id, is_glob(pth, sc, i.span));
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}
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_ { }
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}
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}
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fn path_from_scope(sc: scopes, n: str) -> str {
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let path = n + "::";
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list::iter(sc) {|s|
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alt s {
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scope_item(i) { path = i.ident + "::" + path; }
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_ {}
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}
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}
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path
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}
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fn index_i(e: @env, i: @ast::item, sc: scopes, v: vt<scopes>) {
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visit_item_with_scope(i, sc, v);
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alt i.node {
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ast::item_mod(md) {
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e.mod_map.insert(i.id,
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@{m: some(md),
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index: index_mod(md),
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mutable glob_imports: [],
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glob_imported_names: new_str_hash(),
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path: path_from_scope(sc, i.ident)});
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}
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ast::item_native_mod(nmd) {
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e.mod_map.insert(i.id,
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@{m: none::<ast::_mod>,
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index: index_nmod(nmd),
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mutable glob_imports: [],
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glob_imported_names: new_str_hash(),
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path: path_from_scope(sc, i.ident)});
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}
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_ { }
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}
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}
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// Next, assemble the links for globbed imports.
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let v_link_glob =
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@{visit_view_item: bind link_glob(e, _, _, _),
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visit_block: visit_block_with_scope,
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visit_item: visit_item_with_scope
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with *visit::default_visitor::<scopes>()};
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visit::visit_crate(*c, cons(scope_crate, @nil),
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visit::mk_vt(v_link_glob));
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fn link_glob(e: @env, vi: @ast::view_item, sc: scopes, _v: vt<scopes>) {
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alt vi.node {
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//if it really is a glob import, that is
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ast::view_item_import_glob(path, _) {
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let imp = follow_import(*e, sc, *path, vi.span);
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if option::is_some(imp) {
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let glob = {def: option::get(imp), item: vi};
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check list::is_not_empty(sc);
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alt list::head(sc) {
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scope_item(i) {
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e.mod_map.get(i.id).glob_imports += [glob];
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}
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scope_block(b, _, _) {
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let globs = alt e.block_map.find(b.node.id) {
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some(globs) { globs + [glob] } none. { [glob] }
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};
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e.block_map.insert(b.node.id, globs);
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}
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scope_crate. {
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e.mod_map.get(ast::crate_node_id).glob_imports += [glob];
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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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}
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fn resolve_imports(e: env) {
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e.used_imports.track = true;
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e.imports.values {|v|
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alt v {
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todo(node_id, name, path, span, scopes) {
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resolve_import(e, local_def(node_id), name, *path, span, scopes);
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}
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resolved(_, _, _, _, _, _) | is_glob(_, _, _) { }
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}
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};
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e.used_imports.track = false;
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e.sess.abort_if_errors();
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}
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fn check_unused_imports(e: @env) {
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e.imports.items {|k, v|
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alt v {
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resolved(_, _, _, _, name, sp) {
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if !vec::member(k, e.used_imports.data) {
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e.sess.span_warn(sp, "unused import " + name);
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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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fn resolve_capture_item(e: @env, sc: scopes, &&cap_item: @ast::capture_item) {
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let dcur = lookup_in_scope_strict(
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*e, sc, cap_item.span, cap_item.name, ns_value);
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maybe_insert(e, cap_item.id, dcur);
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}
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fn maybe_insert(e: @env, id: node_id, def: option::t<def>) {
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if option::is_some(def) { e.def_map.insert(id, option::get(def)); }
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}
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fn resolve_names(e: @env, c: @ast::crate) {
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e.used_imports.track = true;
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let v =
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@{visit_native_item: visit_native_item_with_scope,
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visit_item: visit_item_with_scope,
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visit_block: visit_block_with_scope,
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visit_decl: visit_decl_with_scope,
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visit_arm: visit_arm_with_scope,
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visit_pat: bind walk_pat(e, _, _, _),
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visit_expr: bind walk_expr(e, _, _, _),
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visit_ty: bind walk_ty(e, _, _, _),
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visit_constr: bind walk_constr(e, _, _, _, _, _),
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visit_fn: bind visit_fn_with_scope(e, _, _, _, _, _, _, _)
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with *visit::default_visitor()};
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visit::visit_crate(*c, cons(scope_crate, @nil), visit::mk_vt(v));
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e.used_imports.track = false;
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e.sess.abort_if_errors();
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fn walk_expr(e: @env, exp: @ast::expr, sc: scopes, v: vt<scopes>) {
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visit_expr_with_scope(exp, sc, v);
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alt exp.node {
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ast::expr_path(p) {
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maybe_insert(e, exp.id,
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lookup_path_strict(*e, sc, exp.span, p.node,
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ns_value));
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}
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ast::expr_fn(_, _, _, cap_clause) {
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let rci = bind resolve_capture_item(e, sc, _);
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vec::iter(cap_clause.copies, rci);
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vec::iter(cap_clause.moves, rci);
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}
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_ { }
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}
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}
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fn walk_ty(e: @env, t: @ast::ty, sc: scopes, v: vt<scopes>) {
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visit::visit_ty(t, sc, v);
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alt t.node {
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ast::ty_path(p, id) {
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maybe_insert(e, id,
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lookup_path_strict(*e, sc, t.span, p.node, ns_type));
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}
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_ { }
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}
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}
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fn walk_constr(e: @env, p: @ast::path, sp: span, id: node_id, sc: scopes,
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_v: vt<scopes>) {
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maybe_insert(e, id, lookup_path_strict(*e, sc, sp, p.node, ns_value));
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}
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fn walk_pat(e: @env, pat: @ast::pat, sc: scopes, v: vt<scopes>) {
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visit::visit_pat(pat, sc, v);
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alt pat.node {
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ast::pat_tag(p, _) {
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let fnd = lookup_path_strict(*e, sc, p.span, p.node, ns_value);
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alt option::get(fnd) {
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ast::def_variant(did, vid) {
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e.def_map.insert(pat.id, option::get(fnd));
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}
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_ {
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e.sess.span_err(p.span,
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"not a tag variant: " +
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ast_util::path_name(p));
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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 helper functions
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fn visit_item_with_scope(i: @ast::item, sc: scopes, v: vt<scopes>) {
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let sc = cons(scope_item(i), @sc);
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alt i.node {
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ast::item_impl(tps, ifce, sty, methods) {
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visit::visit_ty_params(tps, sc, v);
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alt ifce { some(ty) { v.visit_ty(ty, sc, v); } _ {} }
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v.visit_ty(sty, sc, v);
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for m in methods {
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let msc = cons(scope_method(i.id, tps + m.tps), @sc);
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v.visit_fn(visit::fk_method(m.ident, []),
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m.decl, m.body, m.span, m.id, msc, v);
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}
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}
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ast::item_iface(tps, methods) {
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visit::visit_ty_params(tps, sc, v);
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for m in methods {
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let msc = cons(scope_method(i.id, tps + m.tps), @sc);
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for a in m.decl.inputs { v.visit_ty(a.ty, msc, v); }
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v.visit_ty(m.decl.output, msc, v);
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}
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}
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_ { visit::visit_item(i, sc, v); }
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}
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}
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fn visit_native_item_with_scope(ni: @ast::native_item, sc: scopes,
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v: vt<scopes>) {
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visit::visit_native_item(ni, cons(scope_native_item(ni), @sc), v);
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}
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fn visit_fn_with_scope(e: @env, fk: visit::fn_kind, decl: ast::fn_decl,
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body: ast::blk, sp: span,
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id: node_id, sc: scopes, v: vt<scopes>) {
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// is this a main fn declaration?
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alt fk {
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visit::fk_item_fn(nm, _) {
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if is_main_name([nm]) && !e.sess.building_library() {
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// This is a main function -- set it in the session
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// as the main ID
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e.sess.set_main_id(id);
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}
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}
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_ { /* fallthrough */ }
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}
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// here's where we need to set up the mapping
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// for f's constrs in the table.
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for c: @ast::constr in decl.constraints { resolve_constr(e, c, sc, v); }
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let scope = alt fk {
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visit::fk_item_fn(_, tps) | visit::fk_res(_, tps) |
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visit::fk_method(_, tps) {
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scope_bare_fn(decl, id, tps)
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|
}
|
|
visit::fk_anon(_) | visit::fk_fn_block. {
|
|
scope_fn_expr(decl, id, [])
|
|
}
|
|
};
|
|
|
|
visit::visit_fn(fk, decl, body, sp, id, cons(scope, @sc), v);
|
|
}
|
|
|
|
fn visit_block_with_scope(b: ast::blk, sc: scopes, v: vt<scopes>) {
|
|
let pos = @mutable 0u, loc = @mutable 0u;
|
|
let block_sc = cons(scope_block(b, pos, loc), @sc);
|
|
for vi in b.node.view_items { v.visit_view_item(vi, block_sc, v); }
|
|
for stmt in b.node.stmts {
|
|
v.visit_stmt(stmt, block_sc, v);;
|
|
*pos += 1u;;
|
|
*loc = 0u;
|
|
}
|
|
visit::visit_expr_opt(b.node.expr, block_sc, v);
|
|
}
|
|
|
|
fn visit_decl_with_scope(d: @decl, sc: scopes, v: vt<scopes>) {
|
|
check list::is_not_empty(sc);
|
|
let loc_pos = alt list::head(sc) {
|
|
scope_block(_, _, pos) { pos }
|
|
_ { @mutable 0u }
|
|
};
|
|
alt d.node {
|
|
decl_local(locs) {
|
|
for (_, loc) in locs { v.visit_local(loc, sc, v);; *loc_pos += 1u; }
|
|
}
|
|
decl_item(it) { v.visit_item(it, sc, v); }
|
|
}
|
|
}
|
|
|
|
fn visit_arm_with_scope(a: ast::arm, sc: scopes, v: vt<scopes>) {
|
|
for p: @pat in a.pats { v.visit_pat(p, sc, v); }
|
|
let sc_inner = cons(scope_arm(a), @sc);
|
|
visit::visit_expr_opt(a.guard, sc_inner, v);
|
|
v.visit_block(a.body, sc_inner, v);
|
|
}
|
|
|
|
fn visit_expr_with_scope(x: @ast::expr, sc: scopes, v: vt<scopes>) {
|
|
alt x.node {
|
|
ast::expr_for(decl, coll, blk) {
|
|
let new_sc = cons(scope_loop(decl), @sc);
|
|
v.visit_expr(coll, sc, v);
|
|
v.visit_local(decl, new_sc, v);
|
|
v.visit_block(blk, new_sc, v);
|
|
}
|
|
ast::expr_anon_obj(_) {
|
|
visit::visit_expr(x, cons(scope_method(x.id, []), @sc), v);
|
|
}
|
|
_ { visit::visit_expr(x, sc, v); }
|
|
}
|
|
}
|
|
|
|
fn follow_import(e: env, sc: scopes, path: [ident], sp: span) ->
|
|
option::t<def> {
|
|
let path_len = vec::len(path);
|
|
let dcur = lookup_in_scope_strict(e, sc, sp, path[0], ns_module);
|
|
let i = 1u;
|
|
while true && option::is_some(dcur) {
|
|
if i == path_len { break; }
|
|
dcur =
|
|
lookup_in_mod_strict(e, option::get(dcur), sp, path[i],
|
|
ns_module, outside);
|
|
i += 1u;
|
|
}
|
|
if i == path_len {
|
|
alt option::get(dcur) {
|
|
ast::def_mod(_) | ast::def_native_mod(_) { ret dcur; }
|
|
_ {
|
|
e.sess.span_err(sp, str::connect(path, "::") +
|
|
" does not name a module.");
|
|
ret none;
|
|
}
|
|
}
|
|
} else { ret none; }
|
|
}
|
|
|
|
fn resolve_constr(e: @env, c: @ast::constr, sc: scopes, _v: vt<scopes>) {
|
|
let new_def =
|
|
lookup_path_strict(*e, sc, c.span, c.node.path.node, ns_value);
|
|
if option::is_some(new_def) {
|
|
alt option::get(new_def) {
|
|
ast::def_fn(pred_id, ast::pure_fn.) {
|
|
e.def_map.insert(c.node.id, ast::def_fn(pred_id, ast::pure_fn));
|
|
}
|
|
_ {
|
|
e.sess.span_err(c.span,
|
|
"Non-predicate in constraint: " +
|
|
path_to_str(c.node.path));
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// Import resolution
|
|
fn resolve_import(e: env, defid: ast::def_id, name: ast::ident,
|
|
ids: [ast::ident], sp: codemap::span, sc: scopes) {
|
|
fn register(e: env, id: node_id, cx: ctxt, sp: codemap::span,
|
|
name: ast::ident, lookup: block(namespace) -> option::t<def>,
|
|
impls: [@_impl]) {
|
|
let val = lookup(ns_value), typ = lookup(ns_type),
|
|
md = lookup(ns_module);
|
|
if is_none(val) && is_none(typ) && is_none(md) &&
|
|
vec::len(impls) == 0u {
|
|
unresolved_err(e, cx, sp, name, "import");
|
|
} else {
|
|
e.imports.insert(id, resolved(val, typ, md, @impls, name, sp));
|
|
}
|
|
}
|
|
// Temporarily disable this import and the imports coming after during
|
|
// resolution of this import.
|
|
fn find_imports_after(e: env, id: node_id, sc: scopes) -> [node_id] {
|
|
fn lst(my_id: node_id, vis: [@view_item]) -> [node_id] {
|
|
let imports = [], found = false;
|
|
for vi in vis {
|
|
alt vi.node {
|
|
view_item_import(_, _, id) | view_item_import_glob(_, id) {
|
|
if id == my_id { found = true; }
|
|
if found { imports += [id]; }
|
|
}
|
|
view_item_import_from(_, ids, _) {
|
|
for id in ids {
|
|
if id.node.id == my_id { found = true; }
|
|
if found { imports += [id.node.id]; }
|
|
}
|
|
}
|
|
_ {}
|
|
}
|
|
}
|
|
imports
|
|
}
|
|
alt sc {
|
|
cons(scope_item(@{node: item_mod(m), _}), _) {
|
|
lst(id, m.view_items)
|
|
}
|
|
cons(scope_item(@{node: item_native_mod(m), _}), _) {
|
|
lst(id, m.view_items)
|
|
}
|
|
cons(scope_block(b, _, _), _) {
|
|
lst(id, b.node.view_items)
|
|
}
|
|
cons(scope_crate., _) {
|
|
lst(id,
|
|
option::get(e.mod_map.get(ast::crate_node_id).m).view_items)
|
|
}
|
|
}
|
|
}
|
|
// This function has cleanup code at the end. Do not return without going
|
|
// through that.
|
|
e.imports.insert(defid.node, resolving(sp));
|
|
let ignored = find_imports_after(e, defid.node, sc);
|
|
e.ignored_imports <-> ignored;
|
|
let n_idents = vec::len(ids);
|
|
let end_id = ids[n_idents - 1u];
|
|
if n_idents == 1u {
|
|
register(e, defid.node, in_scope(sc), sp, name,
|
|
{|ns| lookup_in_scope(e, sc, sp, end_id, ns) }, []);
|
|
} else {
|
|
alt lookup_in_scope(e, sc, sp, ids[0], ns_module) {
|
|
none. {
|
|
unresolved_err(e, in_scope(sc), sp, ids[0], ns_name(ns_module));
|
|
}
|
|
some(dcur_) {
|
|
let dcur = dcur_, i = 1u;
|
|
while true {
|
|
if i == n_idents - 1u {
|
|
let impls = [];
|
|
find_impls_in_mod(e, dcur, impls, some(end_id));
|
|
register(e, defid.node, in_mod(dcur), sp, name, {|ns|
|
|
lookup_in_mod(e, dcur, sp, end_id, ns, outside)
|
|
}, impls);
|
|
break;
|
|
} else {
|
|
dcur = alt lookup_in_mod(e, dcur, sp, ids[i], ns_module,
|
|
outside) {
|
|
some(dcur) { dcur }
|
|
none. {
|
|
unresolved_err(e, in_mod(dcur), sp, ids[i],
|
|
ns_name(ns_module));
|
|
break;
|
|
}
|
|
};
|
|
i += 1u;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
e.ignored_imports <-> ignored;
|
|
// If we couldn't resolve the import, don't leave it in a partially
|
|
// resolved state, to avoid having it reported later as a cyclic
|
|
// import
|
|
alt e.imports.find(defid.node) {
|
|
some(resolving(sp)) {
|
|
e.imports.insert(defid.node, resolved(none, none, none, @[], "", sp));
|
|
}
|
|
_ { }
|
|
}
|
|
}
|
|
|
|
|
|
// Utilities
|
|
fn ns_name(ns: namespace) -> str {
|
|
alt ns {
|
|
ns_type. { ret "typename"; }
|
|
ns_value. { ret "name"; }
|
|
ns_module. { ret "modulename"; }
|
|
}
|
|
}
|
|
|
|
tag ctxt { in_mod(def); in_scope(scopes); }
|
|
|
|
fn unresolved_err(e: env, cx: ctxt, sp: span, name: ident, kind: str) {
|
|
fn find_fn_or_mod_scope(sc: scopes) -> option::t<scope> {
|
|
let sc = sc;
|
|
while true {
|
|
alt sc {
|
|
cons(cur, rest) {
|
|
alt cur {
|
|
scope_crate. | scope_bare_fn(_, _, _) |
|
|
scope_fn_expr(_, _, _) |
|
|
scope_item(@{node: ast::item_mod(_), _}) {
|
|
ret some(cur);
|
|
}
|
|
_ { sc = *rest; }
|
|
}
|
|
}
|
|
_ { ret none; }
|
|
}
|
|
}
|
|
fail;
|
|
}
|
|
let path = name;
|
|
alt cx {
|
|
in_scope(sc) {
|
|
alt find_fn_or_mod_scope(sc) {
|
|
some(err_scope) {
|
|
for rs: {ident: str, sc: scope} in e.reported {
|
|
if str::eq(rs.ident, name) && err_scope == rs.sc { ret; }
|
|
}
|
|
e.reported += [{ident: name, sc: err_scope}];
|
|
}
|
|
_ {}
|
|
}
|
|
}
|
|
in_mod(def) {
|
|
let did = def_id_of_def(def);
|
|
if did.crate == ast::local_crate {
|
|
path = e.mod_map.get(did.node).path + path;
|
|
} else if did.node != ast::crate_node_id {
|
|
let paths = e.ext_map.get(did);
|
|
if vec::len(paths) > 0u {
|
|
path = str::connect(paths, "::") + "::" + path;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
e.sess.span_err(sp, mk_unresolved_msg(path, kind));
|
|
}
|
|
|
|
fn unresolved_fatal(e: env, sp: span, id: ident, kind: str) -> ! {
|
|
e.sess.span_fatal(sp, mk_unresolved_msg(id, kind));
|
|
}
|
|
|
|
fn mk_unresolved_msg(id: ident, kind: str) -> str {
|
|
ret #fmt["unresolved %s: %s", kind, id];
|
|
}
|
|
|
|
// Lookup helpers
|
|
fn lookup_path_strict(e: env, sc: scopes, sp: span, pth: ast::path_,
|
|
ns: namespace) -> option::t<def> {
|
|
let n_idents = vec::len(pth.idents);
|
|
let headns = if n_idents == 1u { ns } else { ns_module };
|
|
|
|
let first_scope;
|
|
if pth.global {
|
|
first_scope = list::cons(scope_crate, @list::nil);
|
|
} else { first_scope = sc; }
|
|
|
|
let dcur =
|
|
lookup_in_scope_strict(e, first_scope, sp, pth.idents[0], headns);
|
|
|
|
let i = 1u;
|
|
while i < n_idents && option::is_some(dcur) {
|
|
let curns = if n_idents == i + 1u { ns } else { ns_module };
|
|
dcur =
|
|
lookup_in_mod_strict(e, option::get(dcur), sp, pth.idents[i],
|
|
curns, outside);
|
|
i += 1u;
|
|
}
|
|
ret dcur;
|
|
}
|
|
|
|
fn lookup_in_scope_strict(e: env, sc: scopes, sp: span, name: ident,
|
|
ns: namespace) -> option::t<def> {
|
|
alt lookup_in_scope(e, sc, sp, name, ns) {
|
|
none. {
|
|
unresolved_err(e, in_scope(sc), sp, name, ns_name(ns));
|
|
ret none;
|
|
}
|
|
some(d) { ret some(d); }
|
|
}
|
|
}
|
|
|
|
fn scope_is_fn(sc: scope) -> bool {
|
|
ret alt sc {
|
|
scope_bare_fn(_, _, _) | scope_native_item(_) { true }
|
|
_ { false }
|
|
};
|
|
}
|
|
|
|
// Returns:
|
|
// none - does not close
|
|
// some(node_id) - closes via the expr w/ node_id
|
|
fn scope_closes(sc: scope) -> option::t<node_id> {
|
|
alt sc {
|
|
scope_fn_expr(_, node_id, _) { some(node_id) }
|
|
_ { none }
|
|
}
|
|
}
|
|
|
|
fn def_is_local(d: def) -> bool {
|
|
ret alt d {
|
|
ast::def_arg(_, _) | ast::def_local(_, _) | ast::def_binding(_) |
|
|
ast::def_upvar(_, _, _) {
|
|
true
|
|
}
|
|
_ { false }
|
|
};
|
|
}
|
|
|
|
fn def_is_obj_field(d: def) -> bool {
|
|
alt d {
|
|
ast::def_obj_field(_, _) | ast::def_self(_) { true }
|
|
_ { false }
|
|
}
|
|
}
|
|
|
|
fn def_is_ty_arg(d: def) -> bool {
|
|
ret alt d { ast::def_ty_param(_, _) { true } _ { false } };
|
|
}
|
|
|
|
fn lookup_in_scope(e: env, sc: scopes, sp: span, name: ident, ns: namespace)
|
|
-> option::t<def> {
|
|
fn in_scope(e: env, sp: span, name: ident, s: scope, ns: namespace) ->
|
|
option::t<def> {
|
|
alt s {
|
|
scope_crate. {
|
|
ret lookup_in_local_mod(e, ast::crate_node_id, sp,
|
|
name, ns, inside);
|
|
}
|
|
scope_item(it) {
|
|
alt it.node {
|
|
ast::item_obj(ob, ty_params, _) {
|
|
ret lookup_in_obj(name, ob, ty_params, ns, it.id);
|
|
}
|
|
ast::item_impl(ty_params, _, _, _) {
|
|
if ns == ns_type { ret lookup_in_ty_params(name, ty_params); }
|
|
}
|
|
ast::item_iface(tps, _) | ast::item_tag(_, tps) |
|
|
ast::item_ty(_, tps) {
|
|
if ns == ns_type { ret lookup_in_ty_params(name, tps); }
|
|
}
|
|
ast::item_mod(_) {
|
|
ret lookup_in_local_mod(e, it.id, sp, name, ns, inside);
|
|
}
|
|
ast::item_native_mod(m) {
|
|
ret lookup_in_local_native_mod(e, it.id, sp, name, ns);
|
|
}
|
|
_ { }
|
|
}
|
|
}
|
|
scope_method(id, tps) {
|
|
if (name == "self" && ns == ns_value) {
|
|
ret some(ast::def_self(local_def(id)));
|
|
} else if ns == ns_type {
|
|
ret lookup_in_ty_params(name, tps);
|
|
}
|
|
}
|
|
scope_native_item(it) {
|
|
alt it.node {
|
|
ast::native_item_fn(decl, ty_params) {
|
|
ret lookup_in_fn(name, decl, ty_params, ns);
|
|
}
|
|
}
|
|
}
|
|
scope_bare_fn(decl, _, ty_params) |
|
|
scope_fn_expr(decl, _, ty_params) {
|
|
ret lookup_in_fn(name, decl, ty_params, ns);
|
|
}
|
|
scope_loop(local) {
|
|
if ns == ns_value {
|
|
alt lookup_in_pat(name, local.node.pat) {
|
|
some(did) { ret some(ast::def_binding(did)); }
|
|
_ { }
|
|
}
|
|
}
|
|
}
|
|
scope_block(b, pos, loc) {
|
|
ret lookup_in_block(e, name, sp, b.node, *pos, *loc, ns);
|
|
}
|
|
scope_arm(a) {
|
|
if ns == ns_value {
|
|
alt lookup_in_pat(name, a.pats[0]) {
|
|
some(did) { ret some(ast::def_binding(did)); }
|
|
_ { ret none; }
|
|
}
|
|
}
|
|
}
|
|
}
|
|
ret none::<def>;
|
|
}
|
|
let left_fn = false;
|
|
let closing = [];
|
|
// Used to determine whether obj fields are in scope
|
|
let left_fn_level2 = false;
|
|
let sc = sc;
|
|
while true {
|
|
alt copy sc {
|
|
nil. { ret none::<def>; }
|
|
cons(hd, tl) {
|
|
let fnd = in_scope(e, sp, name, hd, ns);
|
|
if !is_none(fnd) {
|
|
let df = option::get(fnd);
|
|
let local = def_is_local(df);
|
|
if left_fn && local || left_fn_level2 && def_is_obj_field(df)
|
|
|| scope_is_fn(hd) && left_fn && def_is_ty_arg(df) {
|
|
let msg =
|
|
alt ns {
|
|
ns_type. {
|
|
"Attempt to use a type argument out of scope"
|
|
}
|
|
_ { "attempted dynamic environment-capture" }
|
|
};
|
|
e.sess.span_fatal(sp, msg);
|
|
} else if local {
|
|
let i = vec::len(closing);
|
|
while i > 0u {
|
|
i -= 1u;
|
|
df =
|
|
ast::def_upvar(def_id_of_def(df), @df,
|
|
closing[i]);
|
|
fnd = some(df);
|
|
}
|
|
}
|
|
ret fnd;
|
|
}
|
|
if left_fn {
|
|
left_fn_level2 = true;
|
|
} else if ns == ns_value || ns == ns_type {
|
|
left_fn = scope_is_fn(hd);
|
|
alt scope_closes(hd) {
|
|
some(node_id) { closing += [node_id]; }
|
|
_ { }
|
|
}
|
|
}
|
|
sc = *tl;
|
|
}
|
|
}
|
|
}
|
|
e.sess.bug("reached unreachable code in lookup_in_scope"); // sigh
|
|
}
|
|
|
|
fn lookup_in_ty_params(name: ident, ty_params: [ast::ty_param]) ->
|
|
option::t<def> {
|
|
let n = 0u;
|
|
for tp: ast::ty_param in ty_params {
|
|
if str::eq(tp.ident, name) {
|
|
ret some(ast::def_ty_param(local_def(tp.id), n));
|
|
}
|
|
n += 1u;
|
|
}
|
|
ret none::<def>;
|
|
}
|
|
|
|
fn lookup_in_pat(name: ident, pat: @ast::pat) -> option::t<def_id> {
|
|
let found = none;
|
|
ast_util::pat_bindings(pat) {|bound|
|
|
let p_name = alt bound.node { ast::pat_bind(n, _) { n } };
|
|
if str::eq(p_name, name) { found = some(local_def(bound.id)); }
|
|
};
|
|
ret found;
|
|
}
|
|
|
|
fn lookup_in_fn(name: ident, decl: ast::fn_decl, ty_params: [ast::ty_param],
|
|
ns: namespace) -> option::t<def> {
|
|
alt ns {
|
|
ns_value. {
|
|
for a: ast::arg in decl.inputs {
|
|
if str::eq(a.ident, name) {
|
|
ret some(ast::def_arg(local_def(a.id), a.mode));
|
|
}
|
|
}
|
|
ret none::<def>;
|
|
}
|
|
ns_type. { ret lookup_in_ty_params(name, ty_params); }
|
|
_ { ret none::<def>; }
|
|
}
|
|
}
|
|
|
|
fn lookup_in_obj(name: ident, ob: ast::_obj, ty_params: [ast::ty_param],
|
|
ns: namespace, id: node_id) -> option::t<def> {
|
|
alt ns {
|
|
ns_value. {
|
|
if name == "self" { ret some(ast::def_self(local_def(id))); }
|
|
for f: ast::obj_field in ob.fields {
|
|
if str::eq(f.ident, name) {
|
|
ret some(ast::def_obj_field(local_def(f.id), f.mut));
|
|
}
|
|
}
|
|
ret none::<def>;
|
|
}
|
|
ns_type. { ret lookup_in_ty_params(name, ty_params); }
|
|
_ { ret none::<def>; }
|
|
}
|
|
}
|
|
|
|
fn lookup_in_block(e: env, name: ident, sp: span, b: ast::blk_, pos: uint,
|
|
loc_pos: uint, ns: namespace) -> option::t<def> {
|
|
let i = vec::len(b.stmts);
|
|
while i > 0u {
|
|
i -= 1u;
|
|
let st = b.stmts[i];
|
|
alt st.node {
|
|
ast::stmt_decl(d, _) {
|
|
alt d.node {
|
|
ast::decl_local(locs) {
|
|
if i <= pos {
|
|
let j = vec::len(locs);
|
|
while j > 0u {
|
|
j -= 1u;
|
|
let (style, loc) = locs[j];
|
|
if ns == ns_value && (i < pos || j < loc_pos) {
|
|
alt lookup_in_pat(name, loc.node.pat) {
|
|
some(did) {
|
|
ret some(ast::def_local(did, style));
|
|
}
|
|
_ { }
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
ast::decl_item(it) {
|
|
alt it.node {
|
|
ast::item_tag(variants, _) {
|
|
if ns == ns_type {
|
|
if str::eq(it.ident, name) {
|
|
ret some(ast::def_ty(local_def(it.id)));
|
|
}
|
|
} else if ns == ns_value {
|
|
for v: ast::variant in variants {
|
|
if str::eq(v.node.name, name) {
|
|
let i = v.node.id;
|
|
ret some(ast::def_variant(local_def(it.id),
|
|
local_def(i)));
|
|
}
|
|
}
|
|
}
|
|
}
|
|
_ {
|
|
if str::eq(it.ident, name) {
|
|
let found = found_def_item(it, ns);
|
|
if !is_none(found) { ret found; }
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
_ { }
|
|
}
|
|
}
|
|
for vi in b.view_items {
|
|
alt vi.node {
|
|
ast::view_item_import(ident, _, id) {
|
|
if name == ident { ret lookup_import(e, local_def(id), ns); }
|
|
}
|
|
ast::view_item_import_from(mod_path, idents, id) {
|
|
for ident in idents {
|
|
if name == ident.node.name {
|
|
ret lookup_import(e, local_def(ident.node.id), ns);
|
|
}
|
|
}
|
|
}
|
|
ast::view_item_import_glob(_, _) {
|
|
alt e.block_map.find(b.id) {
|
|
some(globs) {
|
|
let found = lookup_in_globs(e, globs, sp, name, ns, inside);
|
|
if found != none { ret found; }
|
|
}
|
|
_ {}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
ret none;
|
|
}
|
|
|
|
fn found_def_item(i: @ast::item, ns: namespace) -> option::t<def> {
|
|
alt i.node {
|
|
ast::item_const(_, _) {
|
|
if ns == ns_value { ret some(ast::def_const(local_def(i.id))); }
|
|
}
|
|
ast::item_fn(decl, _, _) {
|
|
if ns == ns_value {
|
|
ret some(ast::def_fn(local_def(i.id), decl.purity));
|
|
}
|
|
}
|
|
ast::item_mod(_) {
|
|
if ns == ns_module { ret some(ast::def_mod(local_def(i.id))); }
|
|
}
|
|
ast::item_native_mod(_) {
|
|
if ns == ns_module { ret some(ast::def_native_mod(local_def(i.id))); }
|
|
}
|
|
ast::item_ty(_, _) | item_iface(_, _) | item_tag(_, _) {
|
|
if ns == ns_type { ret some(ast::def_ty(local_def(i.id))); }
|
|
}
|
|
ast::item_res(_, _, _, _, ctor_id) {
|
|
alt ns {
|
|
ns_value. {
|
|
ret some(ast::def_fn(local_def(ctor_id), ast::impure_fn));
|
|
}
|
|
ns_type. { ret some(ast::def_ty(local_def(i.id))); }
|
|
_ { }
|
|
}
|
|
}
|
|
ast::item_obj(_, _, ctor_id) {
|
|
alt ns {
|
|
ns_value. {
|
|
ret some(ast::def_fn(local_def(ctor_id), ast::impure_fn));
|
|
}
|
|
ns_type. { ret some(ast::def_ty(local_def(i.id))); }
|
|
_ { }
|
|
}
|
|
}
|
|
_ { }
|
|
}
|
|
ret none;
|
|
}
|
|
|
|
fn lookup_in_mod_strict(e: env, m: def, sp: span, name: ident,
|
|
ns: namespace, dr: dir) -> option::t<def> {
|
|
alt lookup_in_mod(e, m, sp, name, ns, dr) {
|
|
none. {
|
|
unresolved_err(e, in_mod(m), sp, name, ns_name(ns));
|
|
ret none;
|
|
}
|
|
some(d) { ret some(d); }
|
|
}
|
|
}
|
|
|
|
fn lookup_in_mod(e: env, m: def, sp: span, name: ident, ns: namespace,
|
|
dr: dir) -> option::t<def> {
|
|
let defid = def_id_of_def(m);
|
|
if defid.crate != ast::local_crate {
|
|
// examining a module in an external crate
|
|
let cached = e.ext_cache.find({did: defid, ident: name, ns: ns});
|
|
if !is_none(cached) { ret cached; }
|
|
let path = [name];
|
|
if defid.node != ast::crate_node_id {
|
|
path = e.ext_map.get(defid) + path;
|
|
}
|
|
let fnd = lookup_external(e, defid.crate, path, ns);
|
|
if !is_none(fnd) {
|
|
e.ext_cache.insert({did: defid, ident: name, ns: ns},
|
|
option::get(fnd));
|
|
}
|
|
ret fnd;
|
|
}
|
|
alt m {
|
|
ast::def_mod(defid) {
|
|
ret lookup_in_local_mod(e, defid.node, sp, name, ns, dr);
|
|
}
|
|
ast::def_native_mod(defid) {
|
|
ret lookup_in_local_native_mod(e, defid.node, sp, name, ns);
|
|
}
|
|
}
|
|
}
|
|
|
|
fn found_view_item(e: env, vi: @ast::view_item) -> option::t<def> {
|
|
alt vi.node {
|
|
ast::view_item_use(_, _, id) {
|
|
let cnum = cstore::get_use_stmt_cnum(e.cstore, id);
|
|
ret some(ast::def_mod({crate: cnum, node: ast::crate_node_id}));
|
|
}
|
|
}
|
|
}
|
|
|
|
fn lookup_import(e: env, defid: def_id, ns: namespace) -> option::t<def> {
|
|
// Imports are simply ignored when resolving themselves.
|
|
if vec::member(defid.node, e.ignored_imports) { ret none; }
|
|
alt e.imports.get(defid.node) {
|
|
todo(node_id, name, path, span, scopes) {
|
|
resolve_import(e, local_def(node_id), name, *path, span, scopes);
|
|
ret lookup_import(e, defid, ns);
|
|
}
|
|
resolving(sp) {
|
|
e.sess.span_err(sp, "cyclic import");
|
|
ret none;
|
|
}
|
|
resolved(val, typ, md, _, _, _) {
|
|
if e.used_imports.track {
|
|
e.used_imports.data += [defid.node];
|
|
}
|
|
ret alt ns { ns_value. { val } ns_type. { typ }
|
|
ns_module. { md } };
|
|
}
|
|
}
|
|
}
|
|
|
|
fn lookup_in_local_native_mod(e: env, node_id: node_id, sp: span, id: ident,
|
|
ns: namespace) -> option::t<def> {
|
|
ret lookup_in_local_mod(e, node_id, sp, id, ns, inside);
|
|
}
|
|
|
|
fn lookup_in_local_mod(e: env, node_id: node_id, sp: span, id: ident,
|
|
ns: namespace, dr: dir) -> option::t<def> {
|
|
let info = e.mod_map.get(node_id);
|
|
if dr == outside && !is_exported(id, option::get(info.m)) {
|
|
// if we're in a native mod, then dr==inside, so info.m is some _mod
|
|
ret none::<def>; // name is not visible
|
|
}
|
|
alt info.index.find(id) {
|
|
none. { }
|
|
some(lst_) {
|
|
let lst = lst_;
|
|
while true {
|
|
alt lst {
|
|
nil. { break; }
|
|
cons(hd, tl) {
|
|
let found = lookup_in_mie(e, hd, ns);
|
|
if !is_none(found) { ret found; }
|
|
lst = *tl;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
// not local or explicitly imported; try globs:
|
|
ret lookup_glob_in_mod(e, info, sp, id, ns, outside);
|
|
}
|
|
|
|
fn lookup_in_globs(e: env, globs: [glob_imp_def], sp: span, id: ident,
|
|
ns: namespace, dr: dir) -> option::t<def> {
|
|
fn lookup_in_mod_(e: env, def: glob_imp_def, sp: span, name: ident,
|
|
ns: namespace, dr: dir) -> option::t<glob_imp_def> {
|
|
alt def.item.node {
|
|
ast::view_item_import_glob(_, id) {
|
|
if vec::member(id, e.ignored_imports) { ret none; }
|
|
}
|
|
}
|
|
alt lookup_in_mod(e, def.def, sp, name, ns, dr) {
|
|
some(d) { option::some({def: d, item: def.item}) }
|
|
none. { none }
|
|
}
|
|
}
|
|
let matches = vec::filter_map(copy globs,
|
|
bind lookup_in_mod_(e, _, sp, id, ns, dr));
|
|
if vec::len(matches) == 0u {
|
|
ret none;
|
|
} else if vec::len(matches) == 1u {
|
|
ret some(matches[0].def);
|
|
} else {
|
|
for match: glob_imp_def in matches {
|
|
let sp = match.item.span;
|
|
e.sess.span_note(sp, #fmt["'%s' is imported here", id]);
|
|
}
|
|
e.sess.span_fatal(sp, "'" + id + "' is glob-imported from" +
|
|
" multiple different modules.");
|
|
}
|
|
}
|
|
|
|
fn lookup_glob_in_mod(e: env, info: @indexed_mod, sp: span, id: ident,
|
|
wanted_ns: namespace, dr: dir) -> option::t<def> {
|
|
// since we don't know what names we have in advance,
|
|
// absence takes the place of todo()
|
|
if !info.glob_imported_names.contains_key(id) {
|
|
info.glob_imported_names.insert(id, glob_resolving(sp));
|
|
let val = lookup_in_globs(e, info.glob_imports, sp, id, ns_value, dr);
|
|
let typ = lookup_in_globs(e, info.glob_imports, sp, id, ns_type, dr);
|
|
let md = lookup_in_globs(e, info.glob_imports, sp, id, ns_module, dr);
|
|
info.glob_imported_names.insert(id, glob_resolved(val, typ, md));
|
|
}
|
|
alt info.glob_imported_names.get(id) {
|
|
glob_resolving(sp) { ret none::<def>; }
|
|
glob_resolved(val, typ, md) {
|
|
ret alt wanted_ns {
|
|
ns_value. { val }
|
|
ns_type. { typ }
|
|
ns_module. { md }
|
|
};
|
|
}
|
|
}
|
|
}
|
|
|
|
fn lookup_in_mie(e: env, mie: mod_index_entry, ns: namespace) ->
|
|
option::t<def> {
|
|
alt mie {
|
|
mie_view_item(view_item) {
|
|
if ns == ns_module { ret found_view_item(e, view_item); }
|
|
}
|
|
mie_import_ident(id, _) { ret lookup_import(e, local_def(id), ns); }
|
|
mie_item(item) { ret found_def_item(item, ns); }
|
|
mie_tag_variant(item, variant_idx) {
|
|
alt item.node {
|
|
ast::item_tag(variants, _) {
|
|
if ns == ns_value {
|
|
let vid = variants[variant_idx].node.id;
|
|
ret some(ast::def_variant(local_def(item.id),
|
|
local_def(vid)));
|
|
} else { ret none::<def>; }
|
|
}
|
|
}
|
|
}
|
|
mie_native_item(native_item) {
|
|
alt native_item.node {
|
|
ast::native_item_ty. {
|
|
if ns == ns_type {
|
|
ret some(ast::def_native_ty(local_def(native_item.id)));
|
|
}
|
|
}
|
|
ast::native_item_fn(decl, _) {
|
|
if ns == ns_value {
|
|
ret some(ast::def_native_fn(
|
|
local_def(native_item.id),
|
|
decl.purity));
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
ret none::<def>;
|
|
}
|
|
|
|
|
|
// Module indexing
|
|
fn add_to_index(index: hashmap<ident, list<mod_index_entry>>, id: ident,
|
|
ent: mod_index_entry) {
|
|
alt index.find(id) {
|
|
none. { index.insert(id, cons(ent, @nil::<mod_index_entry>)); }
|
|
some(prev) { index.insert(id, cons(ent, @prev)); }
|
|
}
|
|
}
|
|
|
|
fn index_mod(md: ast::_mod) -> mod_index {
|
|
let index = new_str_hash::<list<mod_index_entry>>();
|
|
for it: @ast::view_item in md.view_items {
|
|
alt it.node {
|
|
ast::view_item_use(ident, _, _) {
|
|
add_to_index(index, ident, mie_view_item(it));
|
|
}
|
|
ast::view_item_import(ident, _, id) {
|
|
add_to_index(index, ident, mie_import_ident(id, it.span));
|
|
}
|
|
ast::view_item_import_from(_, idents, _) {
|
|
for ident in idents {
|
|
add_to_index(index, ident.node.name,
|
|
mie_import_ident(ident.node.id, ident.span));
|
|
}
|
|
}
|
|
//globbed imports have to be resolved lazily.
|
|
ast::view_item_import_glob(_, _) | ast::view_item_export(_, _) {}
|
|
}
|
|
}
|
|
for it: @ast::item in md.items {
|
|
alt it.node {
|
|
ast::item_const(_, _) | ast::item_fn(_, _, _) | ast::item_mod(_) |
|
|
ast::item_native_mod(_) | ast::item_ty(_, _) |
|
|
ast::item_res(_, _, _, _, _) | ast::item_obj(_, _, _) |
|
|
ast::item_impl(_, _, _, _) | ast::item_iface(_, _) {
|
|
add_to_index(index, it.ident, mie_item(it));
|
|
}
|
|
ast::item_tag(variants, _) {
|
|
add_to_index(index, it.ident, mie_item(it));
|
|
let variant_idx: uint = 0u;
|
|
for v: ast::variant in variants {
|
|
add_to_index(index, v.node.name,
|
|
mie_tag_variant(it, variant_idx));
|
|
variant_idx += 1u;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
ret index;
|
|
}
|
|
|
|
fn index_nmod(md: ast::native_mod) -> mod_index {
|
|
let index = new_str_hash::<list<mod_index_entry>>();
|
|
for it: @ast::view_item in md.view_items {
|
|
alt it.node {
|
|
ast::view_item_use(ident, _, _) {
|
|
add_to_index(index, ident, mie_view_item(it));
|
|
}
|
|
ast::view_item_import(ident, _, id) {
|
|
add_to_index(index, ident, mie_import_ident(id, it.span));
|
|
}
|
|
ast::view_item_import_from(_, idents, _) {
|
|
for ident in idents {
|
|
add_to_index(index, ident.node.name,
|
|
mie_import_ident(ident.node.id, ident.span));
|
|
}
|
|
}
|
|
ast::view_item_import_glob(_, _) | ast::view_item_export(_, _) { }
|
|
}
|
|
}
|
|
for it: @ast::native_item in md.items {
|
|
add_to_index(index, it.ident, mie_native_item(it));
|
|
}
|
|
ret index;
|
|
}
|
|
|
|
|
|
// External lookups
|
|
fn ns_for_def(d: def) -> namespace {
|
|
alt d {
|
|
ast::def_fn(_, _) | ast::def_obj_field(_, _) | ast::def_self(_) |
|
|
ast::def_const(_) | ast::def_arg(_, _) | ast::def_local(_, _) |
|
|
ast::def_upvar(_, _, _) | ast::def_variant(_, _) |
|
|
ast::def_native_fn(_, _) | ast::def_self(_) { ns_value }
|
|
|
|
ast::def_mod(_) | ast::def_native_mod(_) { ns_module }
|
|
|
|
ast::def_ty(_) | ast::def_binding(_) | ast::def_use(_) |
|
|
ast::def_native_ty(_) { ns_type }
|
|
}
|
|
}
|
|
|
|
fn lookup_external(e: env, cnum: int, ids: [ident], ns: namespace) ->
|
|
option::t<def> {
|
|
for d: def in csearch::lookup_defs(e.sess.get_cstore(), cnum, ids) {
|
|
let did = def_id_of_def(d);
|
|
alt d {
|
|
def_mod(_) | def_native_mod(_) {
|
|
// The [native] module name might have renamed when importing,
|
|
// find the original name for further lookup of names inside the
|
|
// [native] module
|
|
if did.crate != ast::local_crate {
|
|
let cname = cstore::get_crate_data(e.cstore, did.crate).name;
|
|
let name =
|
|
csearch::get_item_name(e.cstore, did.crate, did.node);
|
|
#debug("lookup_external: %s %d, %d, %s, %s", cname,
|
|
did.crate, did.node, str::connect(ids, "::"), name);
|
|
e.ext_map.insert(did, vec::init(ids) + [name]);
|
|
} else {
|
|
e.ext_map.insert(did, ids);
|
|
}
|
|
}
|
|
_ {
|
|
e.ext_map.insert(did, ids);
|
|
}
|
|
}
|
|
if ns == ns_for_def(d) { ret some(d); }
|
|
}
|
|
ret none::<def>;
|
|
}
|
|
|
|
|
|
// Collision detection
|
|
fn check_for_collisions(e: @env, c: ast::crate) {
|
|
// Module indices make checking those relatively simple -- just check each
|
|
// name for multiple entities in the same namespace.
|
|
e.mod_map.values {|val|
|
|
val.index.items {|k, v| check_mod_name(*e, k, v); };
|
|
};
|
|
// Other scopes have to be checked the hard way.
|
|
let v =
|
|
@{visit_item: bind check_item(e, _, _, _),
|
|
visit_block: bind check_block(e, _, _, _),
|
|
visit_arm: bind check_arm(e, _, _, _),
|
|
visit_expr: bind check_expr(e, _, _, _),
|
|
visit_ty: bind check_ty(e, _, _, _) with *visit::default_visitor()};
|
|
visit::visit_crate(c, (), visit::mk_vt(v));
|
|
}
|
|
|
|
fn check_mod_name(e: env, name: ident, entries: list<mod_index_entry>) {
|
|
let saw_mod = false;
|
|
let saw_type = false;
|
|
let saw_value = false;
|
|
let entries = entries;
|
|
fn dup(e: env, sp: span, word: str, name: ident) {
|
|
e.sess.span_fatal(sp, "duplicate definition of " + word + name);
|
|
}
|
|
while true {
|
|
alt entries {
|
|
cons(entry, rest) {
|
|
if !is_none(lookup_in_mie(e, entry, ns_value)) {
|
|
if saw_value {
|
|
dup(e, mie_span(entry), "", name);
|
|
} else { saw_value = true; }
|
|
}
|
|
if !is_none(lookup_in_mie(e, entry, ns_type)) {
|
|
if saw_type {
|
|
dup(e, mie_span(entry), "type ", name);
|
|
} else { saw_type = true; }
|
|
}
|
|
if !is_none(lookup_in_mie(e, entry, ns_module)) {
|
|
if saw_mod {
|
|
dup(e, mie_span(entry), "module ", name);
|
|
} else { saw_mod = true; }
|
|
}
|
|
entries = *rest;
|
|
}
|
|
nil. { break; }
|
|
}
|
|
}
|
|
}
|
|
|
|
fn mie_span(mie: mod_index_entry) -> span {
|
|
ret alt mie {
|
|
mie_view_item(item) { item.span }
|
|
mie_import_ident(_, span) { span }
|
|
mie_item(item) { item.span }
|
|
mie_tag_variant(item, _) { item.span }
|
|
mie_native_item(item) { item.span }
|
|
};
|
|
}
|
|
|
|
fn check_item(e: @env, i: @ast::item, &&x: (), v: vt<()>) {
|
|
fn typaram_names(tps: [ast::ty_param]) -> [ident] {
|
|
let x: [ast::ident] = [];
|
|
for tp: ast::ty_param in tps { x += [tp.ident]; }
|
|
ret x;
|
|
}
|
|
visit::visit_item(i, x, v);
|
|
alt i.node {
|
|
ast::item_fn(decl, ty_params, _) {
|
|
check_fn(*e, i.span, decl);
|
|
ensure_unique(*e, i.span, typaram_names(ty_params), ident_id,
|
|
"type parameter");
|
|
}
|
|
ast::item_obj(ob, ty_params, _) {
|
|
fn field_name(field: ast::obj_field) -> ident { ret field.ident; }
|
|
ensure_unique(*e, i.span, ob.fields, field_name, "object field");
|
|
for m: @ast::method in ob.methods {
|
|
check_fn(*e, m.span, m.decl);
|
|
}
|
|
ensure_unique(*e, i.span, typaram_names(ty_params), ident_id,
|
|
"type parameter");
|
|
}
|
|
ast::item_tag(_, ty_params) {
|
|
ensure_unique(*e, i.span, typaram_names(ty_params), ident_id,
|
|
"type parameter");
|
|
}
|
|
_ { }
|
|
}
|
|
}
|
|
|
|
fn check_pat(ch: checker, p: @ast::pat) {
|
|
ast_util::pat_bindings(p) {|p|
|
|
let ident = alt p.node { pat_bind(n, _) { n } };
|
|
add_name(ch, p.span, ident);
|
|
};
|
|
}
|
|
|
|
fn check_arm(e: @env, a: ast::arm, &&x: (), v: vt<()>) {
|
|
visit::visit_arm(a, x, v);
|
|
let ch0 = checker(*e, "binding");
|
|
check_pat(ch0, a.pats[0]);
|
|
let seen0 = ch0.seen;
|
|
let i = vec::len(a.pats);
|
|
while i > 1u {
|
|
i -= 1u;
|
|
let ch = checker(*e, "binding");
|
|
check_pat(ch, a.pats[i]);
|
|
|
|
// Ensure the bindings introduced in this pattern are the same as in
|
|
// the first pattern.
|
|
if vec::len(ch.seen) != vec::len(seen0) {
|
|
e.sess.span_err(a.pats[i].span,
|
|
"inconsistent number of bindings");
|
|
} else {
|
|
for name: ident in ch.seen {
|
|
if is_none(vec::find(seen0, bind str::eq(name, _))) {
|
|
// Fight the alias checker
|
|
let name_ = name;
|
|
e.sess.span_err(a.pats[i].span,
|
|
"binding " + name_ +
|
|
" does not occur in first pattern");
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
fn check_block(e: @env, b: ast::blk, &&x: (), v: vt<()>) {
|
|
visit::visit_block(b, x, v);
|
|
let values = checker(*e, "value");
|
|
let types = checker(*e, "type");
|
|
let mods = checker(*e, "module");
|
|
for st: @ast::stmt in b.node.stmts {
|
|
alt st.node {
|
|
ast::stmt_decl(d, _) {
|
|
alt d.node {
|
|
ast::decl_local(locs) {
|
|
let local_values = checker(*e, "value");
|
|
for (_, loc) in locs {
|
|
ast_util::pat_bindings(loc.node.pat) {|p|
|
|
let ident = alt p.node { pat_bind(n, _) { n } };
|
|
add_name(local_values, p.span, ident);
|
|
check_name(values, p.span, ident);
|
|
};
|
|
}
|
|
}
|
|
ast::decl_item(it) {
|
|
alt it.node {
|
|
ast::item_tag(variants, _) {
|
|
add_name(types, it.span, it.ident);
|
|
for v: ast::variant in variants {
|
|
add_name(values, v.span, v.node.name);
|
|
}
|
|
}
|
|
ast::item_mod(_) | ast::item_native_mod(_) {
|
|
add_name(mods, it.span, it.ident);
|
|
}
|
|
ast::item_const(_, _) | ast::item_fn(_, _, _) {
|
|
add_name(values, it.span, it.ident);
|
|
}
|
|
ast::item_ty(_, _) | ast::item_iface(_, _) {
|
|
add_name(types, it.span, it.ident);
|
|
}
|
|
ast::item_res(_, _, _, _, _) | ast::item_obj(_, _, _) {
|
|
add_name(types, it.span, it.ident);
|
|
add_name(values, it.span, it.ident);
|
|
}
|
|
_ { }
|
|
}
|
|
}
|
|
}
|
|
}
|
|
_ { }
|
|
}
|
|
}
|
|
}
|
|
|
|
fn check_fn(e: env, sp: span, decl: ast::fn_decl) {
|
|
fn arg_name(a: ast::arg) -> ident { ret a.ident; }
|
|
ensure_unique(e, sp, decl.inputs, arg_name, "argument");
|
|
}
|
|
|
|
fn check_expr(e: @env, ex: @ast::expr, &&x: (), v: vt<()>) {
|
|
alt ex.node {
|
|
ast::expr_rec(fields, _) {
|
|
fn field_name(f: ast::field) -> ident { ret f.node.ident; }
|
|
ensure_unique(*e, ex.span, fields, field_name, "field");
|
|
}
|
|
_ { }
|
|
}
|
|
visit::visit_expr(ex, x, v);
|
|
}
|
|
|
|
fn check_ty(e: @env, ty: @ast::ty, &&x: (), v: vt<()>) {
|
|
alt ty.node {
|
|
ast::ty_rec(fields) {
|
|
fn field_name(f: ast::ty_field) -> ident { ret f.node.ident; }
|
|
ensure_unique(*e, ty.span, fields, field_name, "field");
|
|
}
|
|
_ { }
|
|
}
|
|
visit::visit_ty(ty, x, v);
|
|
}
|
|
|
|
type checker = @{mutable seen: [ident], kind: str, sess: session};
|
|
|
|
fn checker(e: env, kind: str) -> checker {
|
|
let seen: [ident] = [];
|
|
ret @{mutable seen: seen, kind: kind, sess: e.sess};
|
|
}
|
|
|
|
fn check_name(ch: checker, sp: span, name: ident) {
|
|
for s: ident in ch.seen {
|
|
if str::eq(s, name) {
|
|
ch.sess.span_fatal(sp, "duplicate " + ch.kind + " name: " + name);
|
|
}
|
|
}
|
|
}
|
|
fn add_name(ch: checker, sp: span, name: ident) {
|
|
check_name(ch, sp, name);
|
|
ch.seen += [name];
|
|
}
|
|
|
|
fn ident_id(&&i: ident) -> ident { ret i; }
|
|
|
|
fn ensure_unique<T>(e: env, sp: span, elts: [T], id: fn(T) -> ident,
|
|
kind: str) {
|
|
let ch = checker(e, kind);
|
|
for elt: T in elts { add_name(ch, sp, id(elt)); }
|
|
}
|
|
|
|
fn check_exports(e: @env) {
|
|
fn lookup_glob_any(e: @env, info: @indexed_mod, sp: span, path: str,
|
|
ident: ident) -> bool {
|
|
let lookup =
|
|
bind lookup_glob_in_mod(*e, info, sp, ident, _, inside);
|
|
let (m, v, t) = (lookup(ns_module),
|
|
lookup(ns_value),
|
|
lookup(ns_type));
|
|
maybe_add_reexport(e, path + ident, ns_module, m);
|
|
maybe_add_reexport(e, path + ident, ns_value, v);
|
|
maybe_add_reexport(e, path + ident, ns_type, t);
|
|
ret is_some(m) || is_some(v) || is_some(t);
|
|
}
|
|
|
|
fn maybe_add_reexport(e: @env, path: str, ns: namespace,
|
|
def: option::t<def>) {
|
|
if option::is_some(def) {
|
|
e.exp_map.insert({path: path, ns: ns}, option::get(def));
|
|
}
|
|
}
|
|
|
|
fn check_export(e: @env, ident: str, val: @indexed_mod, vi: @view_item) {
|
|
if val.index.contains_key(ident) {
|
|
let xs = val.index.get(ident);
|
|
list::iter(xs) {|x|
|
|
alt x {
|
|
mie_import_ident(id, _) {
|
|
alt e.imports.get(id) {
|
|
resolved(v, t, m, _, rid, _) {
|
|
maybe_add_reexport(e, val.path + rid, ns_value, v);
|
|
maybe_add_reexport(e, val.path + rid, ns_type, t);
|
|
maybe_add_reexport(e, val.path + rid, ns_module, m);
|
|
}
|
|
_ { }
|
|
}
|
|
}
|
|
_ { }
|
|
}
|
|
}
|
|
} else if lookup_glob_any(e, val, vi.span, val.path, ident) {
|
|
// do nothing
|
|
} else {
|
|
e.sess.span_warn(vi.span,
|
|
#fmt("exported item %s is not defined", ident));
|
|
}
|
|
}
|
|
|
|
e.mod_map.values {|val|
|
|
alt val.m {
|
|
some(m) {
|
|
for vi in m.view_items {
|
|
alt vi.node {
|
|
ast::view_item_export(idents, _) {
|
|
for ident in idents {
|
|
check_export(e, ident, val, vi);
|
|
}
|
|
}
|
|
_ { }
|
|
}
|
|
}
|
|
}
|
|
none. { }
|
|
}
|
|
};
|
|
}
|
|
|
|
// Impl resolution
|
|
|
|
type method_info = {did: def_id, n_tps: uint, ident: ast::ident};
|
|
type _impl = {did: def_id, iface_did: option::t<def_id>,
|
|
ident: ast::ident, methods: [@method_info]};
|
|
type iscopes = list<@[@_impl]>;
|
|
|
|
fn resolve_impls(e: @env, c: @ast::crate) {
|
|
visit::visit_crate(*c, nil, visit::mk_vt(@{
|
|
visit_block: bind visit_block_with_impl_scope(e, _, _, _),
|
|
visit_mod: bind visit_mod_with_impl_scope(e, _, _, _, _),
|
|
visit_expr: bind resolve_impl_in_expr(e, _, _, _)
|
|
with *visit::default_visitor()
|
|
}));
|
|
}
|
|
|
|
fn find_impls_in_view_item(e: env, vi: @ast::view_item,
|
|
&impls: [@_impl], sc: iscopes) {
|
|
alt vi.node {
|
|
ast::view_item_import(name, pt, id) {
|
|
let found = [];
|
|
if vec::len(*pt) == 1u {
|
|
list::iter(sc) {|level|
|
|
if vec::len(found) > 0u { ret; }
|
|
for imp in *level {
|
|
if imp.ident == pt[0] {
|
|
found += [@{ident: name with *imp}];
|
|
}
|
|
}
|
|
if vec::len(found) > 0u { impls += found; }
|
|
}
|
|
} else {
|
|
alt e.imports.get(id) {
|
|
resolved(_, _, _, is, _, _) {
|
|
for i in *is { impls += [@{ident: name with *i}]; }
|
|
}
|
|
}
|
|
}
|
|
}
|
|
ast::view_item_import_from(base, names, _) {
|
|
for nm in names {
|
|
alt e.imports.get(nm.node.id) {
|
|
resolved(_, _, _, is, _, _) { impls += *is; }
|
|
}
|
|
}
|
|
}
|
|
ast::view_item_import_glob(ids, id) {
|
|
alt e.imports.get(id) {
|
|
is_glob(path, sc, sp) {
|
|
alt follow_import(e, sc, *path, sp) {
|
|
some(def) { find_impls_in_mod(e, def, impls, none); }
|
|
_ {}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
_ {}
|
|
}
|
|
}
|
|
|
|
fn find_impls_in_item(e: env, i: @ast::item, &impls: [@_impl],
|
|
name: option::t<ident>,
|
|
ck_exports: option::t<ast::_mod>) {
|
|
alt i.node {
|
|
ast::item_impl(_, ifce, _, mthds) {
|
|
if alt name { some(n) { n == i.ident } _ { true } } &&
|
|
alt ck_exports { some(m) { is_exported(i.ident, m) } _ { true } } {
|
|
impls += [@{did: local_def(i.id),
|
|
iface_did: alt ifce {
|
|
some(@{node: ast::ty_path(_, id), _}) {
|
|
some(def_id_of_def(e.def_map.get(id)))
|
|
}
|
|
_ { none }
|
|
},
|
|
ident: i.ident,
|
|
methods: vec::map(mthds, {|m|
|
|
@{did: local_def(m.id),
|
|
n_tps: vec::len(m.tps),
|
|
ident: m.ident}
|
|
})}];
|
|
}
|
|
}
|
|
_ {}
|
|
}
|
|
}
|
|
|
|
fn find_impls_in_mod(e: env, m: def, &impls: [@_impl],
|
|
name: option::t<ident>) {
|
|
alt m {
|
|
ast::def_mod(defid) {
|
|
let cached;
|
|
alt e.impl_cache.find(defid) {
|
|
some(v) { cached = v; }
|
|
none. {
|
|
cached = if defid.crate == ast::local_crate {
|
|
let tmp = [];
|
|
for i in option::get(e.mod_map.get(defid.node).m).items {
|
|
find_impls_in_item(e, i, tmp, name, none);
|
|
}
|
|
@tmp
|
|
} else {
|
|
@csearch::get_impls_for_mod(e.cstore, defid, name)
|
|
};
|
|
e.impl_cache.insert(defid, cached);
|
|
}
|
|
}
|
|
for im in *cached {
|
|
if alt name { some(n) { n == im.ident } _ { true } } {
|
|
impls += [im];
|
|
}
|
|
}
|
|
}
|
|
_ {}
|
|
}
|
|
}
|
|
|
|
fn visit_block_with_impl_scope(e: @env, b: ast::blk, sc: iscopes,
|
|
v: vt<iscopes>) {
|
|
let impls = [];
|
|
for vi in b.node.view_items {
|
|
find_impls_in_view_item(*e, vi, impls, sc);
|
|
}
|
|
for st in b.node.stmts {
|
|
alt st.node {
|
|
ast::stmt_decl(@{node: ast::decl_item(i), _}, _) {
|
|
find_impls_in_item(*e, i, impls, none, none);
|
|
}
|
|
_ {}
|
|
}
|
|
}
|
|
let sc = vec::len(impls) > 0u ? cons(@impls, @sc) : sc;
|
|
visit::visit_block(b, sc, v);
|
|
}
|
|
|
|
fn visit_mod_with_impl_scope(e: @env, m: ast::_mod, s: span, sc: iscopes,
|
|
v: vt<iscopes>) {
|
|
let impls = [];
|
|
for vi in m.view_items { find_impls_in_view_item(*e, vi, impls, sc); }
|
|
for i in m.items { find_impls_in_item(*e, i, impls, none, none); }
|
|
visit::visit_mod(m, s, vec::len(impls) > 0u ? cons(@impls, @sc) : sc, v);
|
|
}
|
|
|
|
fn resolve_impl_in_expr(e: @env, x: @ast::expr, sc: iscopes, v: vt<iscopes>) {
|
|
alt x.node {
|
|
ast::expr_field(_, _, _) | ast::expr_path(_) {
|
|
e.impl_map.insert(x.id, sc);
|
|
}
|
|
_ {}
|
|
}
|
|
visit::visit_expr(x, sc, v);
|
|
}
|
|
|
|
// Local Variables:
|
|
// mode: rust
|
|
// fill-column: 78;
|
|
// indent-tabs-mode: nil
|
|
// c-basic-offset: 4
|
|
// buffer-file-coding-system: utf-8-unix
|
|
// End:
|