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import std::map;
import std::map::hashmap;
import syntax::ast::*;
import syntax::ast_util;
import syntax::ast_util::inlined_item_methods;
import syntax::{visit, codemap};
import driver::session::session;
import front::attr;
enum path_elt { path_mod(str), path_name(str) }
type path = [path_elt];
fn path_to_str_with_sep(p: path, sep: str) -> str {
let strs = vec::map(p) {|e|
alt e {
path_mod(s) { s }
path_name(s) { s }
}
};
str::connect(strs, sep)
}
fn path_to_str(p: path) -> str {
path_to_str_with_sep(p, "::")
}
enum ast_node {
node_item(@item, @path),
node_native_item(@native_item, native_abi, @path),
node_method(@method, def_id /* impl did */, @path /* path to the impl */),
node_variant(variant, @item, @path),
node_expr(@expr),
node_export(@view_path, @path),
// Locals are numbered, because the alias analysis needs to know in which
// order they are introduced.
node_arg(arg, uint),
node_local(uint),
node_ctor(@item, @path),
node_block(blk),
}
type map = std::map::hashmap<node_id, ast_node>;
type ctx = {map: map, mut path: path,
mut local_id: uint, sess: session};
type vt = visit::vt<ctx>;
fn extend(cx: ctx, elt: str) -> @path {
@(cx.path + [path_name(elt)])
}
fn mk_ast_map_visitor() -> vt {
ret visit::mk_vt(@{
visit_item: map_item,
visit_expr: map_expr,
visit_fn: map_fn,
visit_local: map_local,
visit_arm: map_arm,
visit_view_item: map_view_item,
visit_block: map_block
with *visit::default_visitor()
});
}
fn map_crate(sess: session, c: crate) -> map {
let cx = {map: std::map::int_hash(),
mut path: [],
mut local_id: 0u,
sess: sess};
visit::visit_crate(c, cx, mk_ast_map_visitor());
ret cx.map;
}
// Used for items loaded from external crate that are being inlined into this
// crate. The `path` should be the path to the item but should not include
// the item itself.
fn map_decoded_item(sess: session, map: map, path: path, ii: inlined_item) {
// I believe it is ok for the local IDs of inlined items from other crates
// to overlap with the local ids from this crate, so just generate the ids
// starting from 0. (In particular, I think these ids are only used in
// alias analysis, which we will not be running on the inlined items, and
// even if we did I think it only needs an ordering between local
// variables that are simultaneously in scope).
let cx = {map: map,
mut path: path,
mut local_id: 0u,
sess: sess};
let v = mk_ast_map_visitor();
// methods get added to the AST map when their impl is visited. Since we
// don't decode and instantiate the impl, but just the method, we have to
// add it to the table now:
alt ii {
ii_item(i) { /* fallthrough */ }
ii_native(i) {
cx.map.insert(i.id, node_native_item(i, native_abi_rust_intrinsic,
@path));
}
ii_method(impl_did, m) {
map_method(impl_did, @path, m, cx);
}
}
// visit the item / method contents and add those to the map:
ii.accept(cx, v);
}
fn map_fn(fk: visit::fn_kind, decl: fn_decl, body: blk,
sp: codemap::span, id: node_id, cx: ctx, v: vt) {
for a in decl.inputs {
cx.map.insert(a.id, node_arg(a, cx.local_id));
cx.local_id += 1u;
}
visit::visit_fn(fk, decl, body, sp, id, cx, v);
}
fn map_block(b: blk, cx: ctx, v: vt) {
cx.map.insert(b.node.id, node_block(b));
visit::visit_block(b, cx, v);
}
fn number_pat(cx: ctx, pat: @pat) {
pat_util::walk_pat(pat) {|p|
alt p.node {
pat_ident(_, _) {
cx.map.insert(p.id, node_local(cx.local_id));
cx.local_id += 1u;
}
_ {}
}
};
}
fn map_local(loc: @local, cx: ctx, v: vt) {
number_pat(cx, loc.node.pat);
visit::visit_local(loc, cx, v);
}
fn map_arm(arm: arm, cx: ctx, v: vt) {
number_pat(cx, arm.pats[0]);
visit::visit_arm(arm, cx, v);
}
fn map_method(impl_did: def_id, impl_path: @path,
m: @method, cx: ctx) {
cx.map.insert(m.id, node_method(m, impl_did, impl_path));
cx.map.insert(m.self_id, node_local(cx.local_id));
cx.local_id += 1u;
}
fn map_item(i: @item, cx: ctx, v: vt) {
let item_path = @cx.path;
cx.map.insert(i.id, node_item(i, item_path));
alt i.node {
item_impl(_, _, _, ms) {
let impl_did = ast_util::local_def(i.id);
for m in ms {
map_method(impl_did, extend(cx, i.ident), m, cx);
}
}
item_res(_, _, _, dtor_id, ctor_id) {
cx.map.insert(ctor_id, node_ctor(i, item_path));
cx.map.insert(dtor_id, node_item(i, item_path));
}
item_enum(vs, _) {
for v in vs {
cx.map.insert(v.node.id, node_variant(
v, i, extend(cx, i.ident)));
}
}
item_native_mod(nm) {
let abi = alt attr::native_abi(i.attrs) {
either::left(msg) { cx.sess.span_fatal(i.span, msg); }
either::right(abi) { abi }
};
for nitem in nm.items {
cx.map.insert(nitem.id, node_native_item(nitem, abi, @cx.path));
}
}
item_class(_, items, ctor) {
cx.map.insert(ctor.node.id, node_ctor(i, item_path));
let d_id = ast_util::local_def(i.id);
let p = extend(cx, i.ident);
for ci in items {
// only need to handle methods
alt ci.node.decl {
class_method(m) {
map_method(d_id, p, m, cx);
}
_ {}
}
}
}
_ { }
}
alt i.node {
item_mod(_) | item_native_mod(_) {
cx.path += [path_mod(i.ident)];
}
_ { cx.path += [path_name(i.ident)]; }
}
visit::visit_item(i, cx, v);
vec::pop(cx.path);
}
fn map_view_item(vi: @view_item, cx: ctx, _v: vt) {
alt vi.node {
view_item_export(vps) {
for vp in vps {
let (id, name) = alt vp.node {
view_path_simple(nm, _, id) { (id, nm) }
view_path_glob(pth, id) | view_path_list(pth, _, id) {
// should be a constraint on the type
assert (vec::is_not_empty(*pth));
(id, vec::last(*pth))
}
};
cx.map.insert(id, node_export(vp, extend(cx, name)));
}
}
_ {}
}
}
fn map_expr(ex: @expr, cx: ctx, v: vt) {
cx.map.insert(ex.id, node_expr(ex));
visit::visit_expr(ex, cx, v);
}
// Local Variables:
// mode: rust
// fill-column: 78;
// indent-tabs-mode: nil
// c-basic-offset: 4
// buffer-file-coding-system: utf-8-unix
// End:
|
