641 lines
21 KiB
Rust
641 lines
21 KiB
Rust
import front.ast;
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import front.ast.ident;
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import front.ast.def;
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import front.ast.ann;
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import driver.session;
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import util.common.new_def_hash;
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import util.common.span;
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import std.map.hashmap;
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import std.list.list;
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import std.list.nil;
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import std.list.cons;
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import std.option;
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import std.option.some;
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import std.option.none;
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import std._str;
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import std._vec;
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tag scope {
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scope_crate(@ast.crate);
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scope_item(@ast.item);
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scope_native_item(@ast.native_item);
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scope_loop(@ast.decl); // there's only 1 decl per loop.
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scope_block(ast.block);
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scope_arm(ast.arm);
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}
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type env = rec(list[scope] scopes,
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session.session sess);
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type import_map = std.map.hashmap[ast.def_id,def_wrap];
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// A simple wrapper over defs that stores a bit more information about modules
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// and uses so that we can use the regular lookup_name when resolving imports.
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tag def_wrap {
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def_wrap_use(@ast.view_item);
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def_wrap_import(@ast.view_item);
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def_wrap_mod(@ast.item);
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def_wrap_native_mod(@ast.item);
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def_wrap_other(def);
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def_wrap_expr_field(uint, def);
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def_wrap_resolving;
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}
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fn unwrap_def(def_wrap d) -> def {
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alt (d) {
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case (def_wrap_use(?it)) {
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alt (it.node) {
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case (ast.view_item_use(_, _, ?id)) {
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ret ast.def_use(id);
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}
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}
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}
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case (def_wrap_import(?it)) {
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alt (it.node) {
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case (ast.view_item_import(_, _, ?id, ?target_def)) {
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alt (target_def) {
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case (some[def](?d)) {
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ret d;
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}
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case (none[def]) {
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fail;
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}
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}
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}
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}
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}
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case (def_wrap_mod(?m)) {
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alt (m.node) {
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case (ast.item_mod(_, _, ?id)) {
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ret ast.def_mod(id);
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}
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}
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}
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case (def_wrap_other(?d)) {
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ret d;
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}
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case (def_wrap_expr_field(_, ?d)) {
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ret d;
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}
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}
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}
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fn lookup_name(&env e, ast.ident i) -> option.t[def] {
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auto d_ = lookup_name_wrapped(e, i);
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alt (d_) {
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case (none[tup(@env, def_wrap)]) {
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ret none[def];
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}
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case (some[tup(@env, def_wrap)](?d)) {
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ret some(unwrap_def(d._1));
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}
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}
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}
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// Follow the path of an import and return what it ultimately points to.
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// If used after imports are resolved, import_id is none.
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fn find_final_def(&env e, import_map index,
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&span sp, vec[ident] idents,
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option.t[ast.def_id] import_id) -> def_wrap {
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// We are given a series of identifiers (a.b.c.d) and we know that
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// in the environment 'e' the identifier 'a' was resolved to 'd'. We
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// should return what a.b.c.d points to in the end.
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fn found_something(&env e, import_map index,
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&span sp, vec[ident] idents, def_wrap d) -> def_wrap {
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fn found_mod(&env e, &import_map index, &span sp,
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vec[ident] idents, @ast.item i) -> def_wrap {
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auto len = _vec.len[ident](idents);
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auto rest_idents = _vec.slice[ident](idents, 1u, len);
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auto empty_e = rec(scopes = nil[scope],
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sess = e.sess);
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auto tmp_e = update_env_for_item(empty_e, i);
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auto next_i = rest_idents.(0);
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auto next_ = lookup_name_wrapped(tmp_e, next_i);
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alt (next_) {
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case (none[tup(@env, def_wrap)]) {
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e.sess.span_err(sp, "unresolved name: " + next_i);
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fail;
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}
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case (some[tup(@env, def_wrap)](?next)) {
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auto combined_e = update_env_for_item(e, i);
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ret found_something(combined_e, index, sp,
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rest_idents, next._1);
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}
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}
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}
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alt (d) {
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case (def_wrap_import(?imp)) {
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alt (imp.node) {
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case (ast.view_item_import(_, ?new_idents, ?d, _)) {
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auto x = find_final_def(e, index, sp, new_idents,
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some(d));
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ret found_something(e, index, sp, idents, x);
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}
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}
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}
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case (_) {
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}
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}
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auto len = _vec.len[ident](idents);
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if (len == 1u) {
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ret d;
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}
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alt (d) {
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case (def_wrap_mod(?i)) {
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ret found_mod(e, index, sp, idents, i);
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}
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case (def_wrap_native_mod(?i)) {
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ret found_mod(e, index, sp, idents, i);
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}
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case (def_wrap_use(?c)) {
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e.sess.span_err(sp, "Crate access is not implemented");
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}
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case (def_wrap_other(?d)) {
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let uint l = _vec.len[ident](idents);
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ret def_wrap_expr_field(l, d);
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}
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}
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fail;
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}
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if (import_id != none[ast.def_id]) {
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alt (index.find(option.get[ast.def_id](import_id))) {
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case (some[def_wrap](?x)) {
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alt (x) {
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case (def_wrap_resolving) {
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e.sess.span_err(sp, "cyclic import");
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fail;
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}
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case (_) {
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ret x;
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}
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}
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}
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case (none[def_wrap]) {
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}
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}
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index.insert(option.get[ast.def_id](import_id), def_wrap_resolving);
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}
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auto first = idents.(0);
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auto d_ = lookup_name_wrapped(e, first);
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alt (d_) {
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case (none[tup(@env, def_wrap)]) {
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e.sess.span_err(sp, "unresolved name: " + first);
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fail;
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}
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case (some[tup(@env, def_wrap)](?d)) {
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auto x = found_something(*d._0, index, sp, idents, d._1);
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if (import_id != none[ast.def_id]) {
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index.insert(option.get[ast.def_id](import_id), x);
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}
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ret x;
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}
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}
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}
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fn lookup_name_wrapped(&env e, ast.ident i) -> option.t[tup(@env, def_wrap)] {
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// log "resolving name " + i;
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fn found_def_item(@ast.item i) -> def_wrap {
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alt (i.node) {
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case (ast.item_const(_, _, _, ?id, _)) {
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ret def_wrap_other(ast.def_const(id));
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}
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case (ast.item_fn(_, _, _, ?id, _)) {
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ret def_wrap_other(ast.def_fn(id));
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}
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case (ast.item_mod(_, _, ?id)) {
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ret def_wrap_mod(i);
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}
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case (ast.item_native_mod(_, _, ?id)) {
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ret def_wrap_native_mod(i);
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}
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case (ast.item_ty(_, _, _, ?id, _)) {
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ret def_wrap_other(ast.def_ty(id));
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}
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case (ast.item_tag(_, _, _, ?id)) {
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ret def_wrap_other(ast.def_ty(id));
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}
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case (ast.item_obj(_, _, _, ?id, _)) {
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ret def_wrap_other(ast.def_obj(id));
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}
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}
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}
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fn found_def_native_item(@ast.native_item i) -> def_wrap {
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alt (i.node) {
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case (ast.native_item_ty(_, ?id)) {
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ret def_wrap_other(ast.def_native_ty(id));
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}
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case (ast.native_item_fn(_, _, _, ?id, _)) {
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ret def_wrap_other(ast.def_native_fn(id));
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}
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}
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}
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fn found_decl_stmt(@ast.stmt s) -> def_wrap {
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alt (s.node) {
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case (ast.stmt_decl(?d)) {
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alt (d.node) {
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case (ast.decl_local(?loc)) {
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auto t = ast.def_local(loc.id);
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ret def_wrap_other(t);
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}
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case (ast.decl_item(?it)) {
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ret found_def_item(it);
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}
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}
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}
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}
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fail;
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}
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fn found_def_view(@ast.view_item i) -> def_wrap {
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alt (i.node) {
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case (ast.view_item_use(_, _, ?id)) {
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ret def_wrap_use(i);
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}
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case (ast.view_item_import(_, ?idents,?d, _)) {
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ret def_wrap_import(i);
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}
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}
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fail;
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}
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fn check_mod(ast.ident i, ast._mod m) -> option.t[def_wrap] {
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alt (m.index.find(i)) {
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case (some[ast.mod_index_entry](?ent)) {
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alt (ent) {
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case (ast.mie_view_item(?view_item)) {
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ret some(found_def_view(view_item));
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}
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case (ast.mie_item(?item)) {
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ret some(found_def_item(item));
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}
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case (ast.mie_tag_variant(?item, ?variant_idx)) {
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alt (item.node) {
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case (ast.item_tag(_, ?variants, _, ?tid)) {
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auto vid = variants.(variant_idx).id;
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auto t = ast.def_variant(tid, vid);
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ret some[def_wrap](def_wrap_other(t));
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}
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case (_) {
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log "tag item not actually a tag";
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fail;
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}
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}
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}
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}
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}
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case (none[ast.mod_index_entry]) {
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ret none[def_wrap];
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}
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}
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}
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fn check_native_mod(ast.ident i, ast.native_mod m) -> option.t[def_wrap] {
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alt (m.index.find(i)) {
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case (some[ast.native_mod_index_entry](?ent)) {
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alt (ent) {
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case (ast.nmie_view_item(?view_item)) {
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ret some(found_def_view(view_item));
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}
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case (ast.nmie_item(?item)) {
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ret some(found_def_native_item(item));
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}
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}
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}
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case (none[ast.native_mod_index_entry]) {
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ret none[def_wrap];
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}
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}
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}
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fn handle_fn_decl(ast.ident i, &ast.fn_decl decl,
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&vec[ast.ty_param] ty_params) -> option.t[def_wrap] {
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for (ast.arg a in decl.inputs) {
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if (_str.eq(a.ident, i)) {
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auto t = ast.def_arg(a.id);
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ret some(def_wrap_other(t));
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}
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}
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for (ast.ty_param tp in ty_params) {
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if (_str.eq(tp.ident, i)) {
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auto t = ast.def_ty_arg(tp.id);
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ret some(def_wrap_other(t));
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}
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}
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ret none[def_wrap];
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}
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fn in_scope(ast.ident i, &scope s) -> option.t[def_wrap] {
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alt (s) {
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case (scope_crate(?c)) {
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ret check_mod(i, c.node.module);
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}
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case (scope_item(?it)) {
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alt (it.node) {
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case (ast.item_fn(_, ?f, ?ty_params, _, _)) {
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ret handle_fn_decl(i, f.decl, ty_params);
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}
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case (ast.item_obj(_, ?ob, ?ty_params, _, _)) {
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for (ast.obj_field f in ob.fields) {
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if (_str.eq(f.ident, i)) {
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auto t = ast.def_obj_field(f.id);
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ret some(def_wrap_other(t));
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}
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}
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for (ast.ty_param tp in ty_params) {
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if (_str.eq(tp.ident, i)) {
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auto t = ast.def_ty_arg(tp.id);
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ret some(def_wrap_other(t));
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}
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}
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}
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case (ast.item_tag(_, _, ?ty_params, _)) {
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for (ast.ty_param tp in ty_params) {
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if (_str.eq(tp.ident, i)) {
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auto t = ast.def_ty_arg(tp.id);
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ret some(def_wrap_other(t));
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}
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}
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}
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case (ast.item_mod(_, ?m, _)) {
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ret check_mod(i, m);
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}
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case (ast.item_native_mod(_, ?m, _)) {
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ret check_native_mod(i, m);
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}
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case (ast.item_ty(_, _, ?ty_params, _, _)) {
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for (ast.ty_param tp in ty_params) {
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if (_str.eq(tp.ident, i)) {
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auto t = ast.def_ty_arg(tp.id);
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ret some(def_wrap_other(t));
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}
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}
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}
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case (_) { /* fall through */ }
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}
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}
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case (scope_native_item(?it)) {
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alt (it.node) {
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case (ast.native_item_fn(_, ?decl, ?ty_params, _, _)) {
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ret handle_fn_decl(i, decl, ty_params);
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}
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}
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}
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case (scope_loop(?d)) {
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alt (d.node) {
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case (ast.decl_local(?local)) {
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if (_str.eq(local.ident, i)) {
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auto lc = ast.def_local(local.id);
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ret some(def_wrap_other(lc));
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}
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}
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}
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}
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case (scope_block(?b)) {
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alt (b.node.index.find(i)) {
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case (some[uint](?ix)) {
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auto x = found_decl_stmt(b.node.stmts.(ix));
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ret some(x);
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}
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case (_) { /* fall through */ }
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}
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}
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case (scope_arm(?a)) {
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alt (a.index.find(i)) {
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case (some[ast.def_id](?did)) {
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auto t = ast.def_binding(did);
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ret some[def_wrap](def_wrap_other(t));
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}
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case (_) { /* fall through */ }
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}
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}
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}
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ret none[def_wrap];
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}
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alt (e.scopes) {
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case (nil[scope]) {
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ret none[tup(@env, def_wrap)];
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}
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case (cons[scope](?hd, ?tl)) {
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auto x = in_scope(i, hd);
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alt (x) {
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case (some[def_wrap](?x)) {
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ret some(tup(@e, x));
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}
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case (none[def_wrap]) {
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auto outer_env = rec(scopes = *tl with e);
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ret lookup_name_wrapped(outer_env, i);
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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 fold_pat_tag(&env e, &span sp, ast.path p, vec[@ast.pat] args,
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option.t[ast.variant_def] old_def,
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ann a) -> @ast.pat {
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auto len = _vec.len[ast.ident](p.node.idents);
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auto last_id = p.node.idents.(len - 1u);
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auto new_def;
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auto index = new_def_hash[def_wrap]();
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auto d = find_final_def(e, index, sp, p.node.idents, none[ast.def_id]);
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alt (unwrap_def(d)) {
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case (ast.def_variant(?did, ?vid)) {
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new_def = some[ast.variant_def](tup(did, vid));
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}
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case (_) {
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e.sess.span_err(sp, "not a tag variant: " + last_id);
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new_def = none[ast.variant_def];
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}
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}
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ret @fold.respan[ast.pat_](sp, ast.pat_tag(p, args, new_def, a));
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}
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// We received a path expression of the following form:
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//
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// a.b.c.d
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//
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// Somewhere along this path there might be a split from a path-expr
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// to a runtime field-expr. For example:
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//
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// 'a' could be the name of a variable in the local scope
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// and 'b.c.d' could be a field-sequence inside it.
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//
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// Or:
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//
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// 'a.b' could be a module path to a constant record, and 'c.d'
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// could be a field within it.
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//
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// Our job here is to figure out what the prefix of 'a.b.c.d' is that
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// corresponds to a static binding-name (a module or slot, with no type info)
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// and split that off as the 'primary' expr_path, with secondary expr_field
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// expressions tacked on the end.
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fn fold_expr_path(&env e, &span sp, &ast.path p, &option.t[def] d,
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ann a) -> @ast.expr {
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auto n_idents = _vec.len[ast.ident](p.node.idents);
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check (n_idents != 0u);
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auto index = new_def_hash[def_wrap]();
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auto d = find_final_def(e, index, sp, p.node.idents, none[ast.def_id]);
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let uint path_len = 0u;
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alt (d) {
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case (def_wrap_expr_field(?remaining, _)) {
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path_len = n_idents - remaining + 1u;
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}
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case (def_wrap_other(_)) {
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path_len = n_idents;
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}
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case (def_wrap_mod(?m)) {
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e.sess.span_err(sp,
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"can't refer to a module as a first-class value");
|
|
fail;
|
|
}
|
|
}
|
|
auto path_elems =
|
|
_vec.slice[ident](p.node.idents, 0u, path_len);
|
|
auto p_ = rec(node=rec(idents = path_elems with p.node) with p);
|
|
auto d_ = some(unwrap_def(d));
|
|
auto ex = @fold.respan[ast.expr_](sp, ast.expr_path(p_, d_, a));
|
|
auto i = path_len;
|
|
while (i < n_idents) {
|
|
auto id = p.node.idents.(i);
|
|
ex = @fold.respan[ast.expr_](sp, ast.expr_field(ex, id, a));
|
|
i += 1u;
|
|
}
|
|
ret ex;
|
|
}
|
|
|
|
fn fold_view_item_import(&env e, &span sp,
|
|
import_map index, ident i,
|
|
vec[ident] is, ast.def_id id,
|
|
option.t[def] target_id) -> @ast.view_item {
|
|
// Produce errors for invalid imports
|
|
auto len = _vec.len[ast.ident](is);
|
|
auto last_id = is.(len - 1u);
|
|
auto d = find_final_def(e, index, sp, is, some(id));
|
|
alt (d) {
|
|
case (def_wrap_expr_field(?remain, _)) {
|
|
auto ident = is.(len - remain);
|
|
e.sess.span_err(sp, ident + " is not a module or crate");
|
|
}
|
|
case (_) {
|
|
}
|
|
}
|
|
let option.t[def] target_def = some(unwrap_def(d));
|
|
ret @fold.respan[ast.view_item_](sp, ast.view_item_import(i, is, id,
|
|
target_def));
|
|
}
|
|
|
|
fn fold_ty_path(&env e, &span sp, ast.path p, &option.t[def] d) -> @ast.ty {
|
|
auto index = new_def_hash[def_wrap]();
|
|
auto d = find_final_def(e, index, sp, p.node.idents, none[ast.def_id]);
|
|
|
|
ret @fold.respan[ast.ty_](sp, ast.ty_path(p, some(unwrap_def(d))));
|
|
}
|
|
|
|
fn update_env_for_crate(&env e, @ast.crate c) -> env {
|
|
ret rec(scopes = cons[scope](scope_crate(c), @e.scopes) with e);
|
|
}
|
|
|
|
fn update_env_for_item(&env e, @ast.item i) -> env {
|
|
ret rec(scopes = cons[scope](scope_item(i), @e.scopes) with e);
|
|
}
|
|
|
|
fn update_env_for_native_item(&env e, @ast.native_item i) -> env {
|
|
ret rec(scopes = cons[scope](scope_native_item(i), @e.scopes) with e);
|
|
}
|
|
|
|
fn update_env_for_block(&env e, &ast.block b) -> env {
|
|
ret rec(scopes = cons[scope](scope_block(b), @e.scopes) with e);
|
|
}
|
|
|
|
fn update_env_for_expr(&env e, @ast.expr x) -> env {
|
|
alt (x.node) {
|
|
case (ast.expr_for(?d, _, _, _)) {
|
|
ret rec(scopes = cons[scope](scope_loop(d), @e.scopes) with e);
|
|
}
|
|
case (ast.expr_for_each(?d, _, _, _)) {
|
|
ret rec(scopes = cons[scope](scope_loop(d), @e.scopes) with e);
|
|
}
|
|
case (_) { }
|
|
}
|
|
ret e;
|
|
}
|
|
|
|
fn update_env_for_arm(&env e, &ast.arm p) -> env {
|
|
ret rec(scopes = cons[scope](scope_arm(p), @e.scopes) with e);
|
|
}
|
|
|
|
fn resolve_imports(session.session sess, @ast.crate crate) -> @ast.crate {
|
|
let fold.ast_fold[env] fld = fold.new_identity_fold[env]();
|
|
|
|
auto import_index = new_def_hash[def_wrap]();
|
|
fld = @rec( fold_view_item_import
|
|
= bind fold_view_item_import(_,_,import_index,_,_,_,_),
|
|
update_env_for_crate = bind update_env_for_crate(_,_),
|
|
update_env_for_item = bind update_env_for_item(_,_),
|
|
update_env_for_native_item =
|
|
bind update_env_for_native_item(_,_),
|
|
update_env_for_block = bind update_env_for_block(_,_),
|
|
update_env_for_arm = bind update_env_for_arm(_,_),
|
|
update_env_for_expr = bind update_env_for_expr(_,_)
|
|
with *fld );
|
|
|
|
auto e = rec(scopes = nil[scope],
|
|
sess = sess);
|
|
|
|
ret fold.fold_crate[env](e, fld, crate);
|
|
}
|
|
|
|
fn resolve_crate(session.session sess, @ast.crate crate) -> @ast.crate {
|
|
|
|
let fold.ast_fold[env] fld = fold.new_identity_fold[env]();
|
|
|
|
auto new_crate = resolve_imports(sess, crate);
|
|
|
|
fld = @rec( fold_pat_tag = bind fold_pat_tag(_,_,_,_,_,_),
|
|
fold_expr_path = bind fold_expr_path(_,_,_,_,_),
|
|
fold_ty_path = bind fold_ty_path(_,_,_,_),
|
|
update_env_for_crate = bind update_env_for_crate(_,_),
|
|
update_env_for_item = bind update_env_for_item(_,_),
|
|
update_env_for_native_item =
|
|
bind update_env_for_native_item(_,_),
|
|
update_env_for_block = bind update_env_for_block(_,_),
|
|
update_env_for_arm = bind update_env_for_arm(_,_),
|
|
update_env_for_expr = bind update_env_for_expr(_,_)
|
|
with *fld );
|
|
|
|
auto e = rec(scopes = nil[scope],
|
|
sess = sess);
|
|
|
|
ret fold.fold_crate[env](e, fld, new_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 ../.. 2>&1 | sed -e 's/\\/x\\//x:\\//g'";
|
|
// End:
|