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rustc: Use linked lists instead of hash tables for region binding scopes

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Hash tables are overkill.
This commit is contained in:
Patrick Walton 2012-03-12 18:47:18 -07:00
parent 4571175568
commit afa046a56b
1 changed files with 16 additions and 6 deletions
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22
src/rustc/middle/region.rs
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@ -8,6 +8,8 @@
import syntax::{ast, visit};
import util::common::new_def_hash;
import std::list;
import std::list::list;
import std::map;
import std::map::hashmap;
@ -19,6 +21,12 @@ enum parent {
pa_crate
}
/* Records the binding site of a region name. */
type binding = {
name: str,
id: ast::def_id
};
type region_map = {
/*
* Mapping from blocks and function expression to their parent block or
@ -37,7 +45,7 @@ enum parent {
sess: session,
def_map: resolve::def_map,
region_map: @region_map,
names_in_scope: hashmap<str,ast::def_id>,
mut bindings: @list<binding>,
/*
* A list of local IDs that will be parented to the next block we
@ -106,12 +114,14 @@ fn resolve_ty(ty: @ast::ty, cx: ctxt, visitor: visit::vt<ctxt>) {
ast::re_named(ident) {
// If at item scope, introduce or reuse a binding. If at
// block scope, require that the binding be introduced.
alt cx.names_in_scope.find(ident) {
some(def_id) { region = ty::re_named(def_id); }
let bindings = cx.bindings;
alt list::find(*bindings, {|b| ident == b.name}) {
some(binding) { region = ty::re_named(binding.id); }
none {
let def_id = {crate: ast::local_crate,
node: region_id};
cx.names_in_scope.insert(ident, def_id);
let binding = {name: ident, id: def_id};
cx.bindings = @list::cons(binding, cx.bindings);
region = ty::re_named(def_id);
alt cx.parent {
@ -248,7 +258,7 @@ fn resolve_expr(expr: @ast::expr, cx: ctxt, visitor: visit::vt<ctxt>) {
fn resolve_item(item: @ast::item, cx: ctxt, visitor: visit::vt<ctxt>) {
// Items create a new outer block scope as far as we're concerned.
let new_cx: ctxt = {names_in_scope: map::new_str_hash(),
let new_cx: ctxt = {bindings: @list::nil,
parent: pa_item(item.id),
in_alt: false
with cx};
@ -263,7 +273,7 @@ fn resolve_crate(sess: session, def_map: resolve::def_map, crate: @ast::crate)
ast_type_to_region: map::new_int_hash(),
local_blocks: map::new_int_hash(),
region_name_to_fn: new_def_hash()},
names_in_scope: map::new_str_hash(),
mut bindings: @list::nil,
mut queued_locals: [],
parent: pa_crate,
in_alt: false};