228 lines
7.2 KiB
Rust
228 lines
7.2 KiB
Rust
// Finds items that are externally reachable, to determine which items
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// need to have their metadata (and possibly their AST) serialized.
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// All items that can be referred to through an exported name are
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// reachable, and when a reachable thing is inline or generic, it
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// makes all other generics or inline functions that it references
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// reachable as well.
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import syntax::ast::*;
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import syntax::{visit, ast_util, ast_map};
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import syntax::ast_util::def_id_of_def;
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import syntax::attr;
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import syntax::print::pprust::expr_to_str;
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import std::map::hashmap;
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import driver::session::*;
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export map, find_reachable;
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type map = std::map::hashmap<node_id, ()>;
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type ctx = {exp_map: resolve3::ExportMap,
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tcx: ty::ctxt,
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method_map: typeck::method_map,
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rmap: map};
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fn find_reachable(crate_mod: _mod, exp_map: resolve3::ExportMap,
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tcx: ty::ctxt, method_map: typeck::method_map) -> map {
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let rmap = std::map::int_hash();
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let cx = {exp_map: exp_map, tcx: tcx, method_map: method_map, rmap: rmap};
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traverse_public_mod(cx, crate_mod);
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traverse_all_resources_and_impls(cx, crate_mod);
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rmap
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}
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fn traverse_exports(cx: ctx, vis: ~[@view_item]) -> bool {
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let mut found_export = false;
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for vec::each(vis) |vi| {
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alt vi.node {
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view_item_export(vps) {
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found_export = true;
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for vec::each(vps) |vp| {
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alt vp.node {
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view_path_simple(_, _, id) | view_path_glob(_, id) |
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view_path_list(_, _, id) {
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traverse_export(cx, id);
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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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found_export
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}
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fn traverse_export(cx: ctx, exp_id: node_id) {
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do option::iter(cx.exp_map.find(exp_id)) |defs| {
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for vec::each(defs) |def| { traverse_def_id(cx, def.id); }
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}
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}
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fn traverse_def_id(cx: ctx, did: def_id) {
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if did.crate != local_crate { return; }
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let n = alt cx.tcx.items.find(did.node) {
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none { return; } // This can happen for self, for example
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some(n) { n }
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};
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alt n {
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ast_map::node_item(item, _) { traverse_public_item(cx, item); }
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ast_map::node_method(_, impl_id, _) { traverse_def_id(cx, impl_id); }
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ast_map::node_foreign_item(item, _, _) { cx.rmap.insert(item.id, ()); }
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ast_map::node_variant(v, _, _) { cx.rmap.insert(v.node.id, ()); }
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// If it's a ctor, consider the parent reachable
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ast_map::node_ctor(_, _, _, parent_id, _) {
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traverse_def_id(cx, parent_id);
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}
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_ {}
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}
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}
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fn traverse_public_mod(cx: ctx, m: _mod) {
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if !traverse_exports(cx, m.view_items) {
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// No exports, so every local item is exported
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for vec::each(m.items) |item| { traverse_public_item(cx, item); }
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}
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}
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fn traverse_public_item(cx: ctx, item: @item) {
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if cx.rmap.contains_key(item.id) { return; }
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cx.rmap.insert(item.id, ());
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alt item.node {
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item_mod(m) { traverse_public_mod(cx, m); }
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item_foreign_mod(nm) {
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if !traverse_exports(cx, nm.view_items) {
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for vec::each(nm.items) |item| { cx.rmap.insert(item.id, ()); }
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}
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}
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item_fn(_, tps, blk) {
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if tps.len() > 0u ||
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attr::find_inline_attr(item.attrs) != attr::ia_none {
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traverse_inline_body(cx, blk);
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}
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}
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item_impl(tps, _, _, ms) {
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for vec::each(ms) |m| {
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if tps.len() > 0u || m.tps.len() > 0u ||
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attr::find_inline_attr(m.attrs) != attr::ia_none {
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cx.rmap.insert(m.id, ());
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traverse_inline_body(cx, m.body);
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}
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}
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}
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item_class(tps, _traits, items, m_ctor, m_dtor) {
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do option::iter(m_ctor) |ctor| {
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cx.rmap.insert(ctor.node.id, ());
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if tps.len() > 0u || attr::find_inline_attr(ctor.node.attrs)
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!= attr::ia_none {
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traverse_inline_body(cx, ctor.node.body);
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}
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}
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do option::iter(m_dtor) |dtor| {
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cx.rmap.insert(dtor.node.id, ());
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if tps.len() > 0u || attr::find_inline_attr(dtor.node.attrs)
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!= attr::ia_none {
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traverse_inline_body(cx, dtor.node.body);
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}
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}
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for vec::each(items) |item| {
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alt item.node {
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class_method(m) {
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cx.rmap.insert(m.id, ());
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if tps.len() > 0u ||
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attr::find_inline_attr(m.attrs) != attr::ia_none {
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traverse_inline_body(cx, m.body);
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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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item_ty(t, _) {
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traverse_ty(t, cx, mk_ty_visitor());
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}
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item_const(*) |
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item_enum(*) | item_trait(*) {}
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item_mac(*) { fail ~"item macros unimplemented" }
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}
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}
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fn mk_ty_visitor() -> visit::vt<ctx> {
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visit::mk_vt(@{visit_ty: traverse_ty with *visit::default_visitor()})
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}
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fn traverse_ty(ty: @ty, cx: ctx, v: visit::vt<ctx>) {
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if cx.rmap.contains_key(ty.id) { return; }
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cx.rmap.insert(ty.id, ());
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alt ty.node {
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ty_path(p, p_id) {
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alt cx.tcx.def_map.find(p_id) {
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// Kind of a hack to check this here, but I'm not sure what else
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// to do
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some(def_prim_ty(_)) { /* do nothing */ }
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some(d) { traverse_def_id(cx, def_id_of_def(d)); }
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none { /* do nothing -- but should we fail here? */ }
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}
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for p.types.each |t| { v.visit_ty(t, cx, v); };
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}
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_ { visit::visit_ty(ty, cx, v); }
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}
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}
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fn traverse_inline_body(cx: ctx, body: blk) {
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fn traverse_expr(e: @expr, cx: ctx, v: visit::vt<ctx>) {
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alt e.node {
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expr_path(_) {
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alt cx.tcx.def_map.find(e.id) {
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some(d) {
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traverse_def_id(cx, def_id_of_def(d));
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}
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none { cx.tcx.sess.span_bug(e.span, fmt!{"Unbound node \
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id %? while traversing %s", e.id, expr_to_str(e)}); }
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}
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}
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expr_field(_, _, _) {
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alt cx.method_map.find(e.id) {
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some({origin: typeck::method_static(did), _}) {
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traverse_def_id(cx, did);
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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::visit_expr(e, cx, v);
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}
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// Don't ignore nested items: for example if a generic fn contains a
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// generic impl (as in deque::create), we need to monomorphize the
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// impl as well
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fn traverse_item(i: @item, cx: ctx, _v: visit::vt<ctx>) {
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traverse_public_item(cx, i);
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}
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visit::visit_block(body, cx, visit::mk_vt(@{
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visit_expr: traverse_expr,
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visit_item: traverse_item
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with *visit::default_visitor()
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}));
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}
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fn traverse_all_resources_and_impls(cx: ctx, crate_mod: _mod) {
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visit::visit_mod(crate_mod, ast_util::dummy_sp(), 0, cx, visit::mk_vt(@{
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visit_expr: |_e, _cx, _v| { },
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visit_item: |i, cx, v| {
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visit::visit_item(i, cx, v);
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alt i.node {
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item_class(_, _, _, _, some(_)) {
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traverse_public_item(cx, i);
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}
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item_impl(*) {
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traverse_public_item(cx, i);
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}
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_ {}
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}
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}
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with *visit::default_visitor()
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}));
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}
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