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rustc: Record the parent function of each function

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This commit is contained in:
Patrick Walton 2012-03-11 17:01:28 -07:00
parent 8f071bb841
commit 46aec2c960
1 changed files with 23 additions and 4 deletions
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27
src/rustc/middle/region.rs
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@ -12,6 +12,8 @@ import std::map::hashmap;
type region_map = {
/* Mapping from a block to its parent block, if there is one. */
parent_blocks: hashmap<ast::node_id,ast::node_id>,
/* Mapping from a lambda to its parent function, if there is one. */
parent_fns: hashmap<ast::node_id,ast::node_id>,
/* Mapping from a region type in the AST to its resolved region. */
ast_type_to_region: hashmap<ast::node_id,ty::region>,
/* Mapping from a local variable to its containing block. */
@ -40,7 +42,8 @@ type ctxt = {
*/
mut queued_locals: [ast::node_id],
parent: parent
parent: parent,
mut parent_fn: option<ast::node_id>
};
// Returns true if `subblock` is equal to or is lexically nested inside
@ -206,10 +209,23 @@ fn resolve_pat(pat: @ast::pat, cx: ctxt, visitor: visit::vt<ctxt>) {
visit::visit_pat(pat, cx, visitor);
}
fn resolve_expr(expr: @ast::expr, cx: ctxt, visitor: visit::vt<ctxt>) {
alt expr.node {
ast::expr_fn(_, _, _, _) | ast::expr_fn_block(_, _) {
let parent_fns = cx.region_map.parent_fns;
parent_fns.insert(expr.id, option::get(cx.parent_fn));
let new_cx = {parent_fn: some(expr.id) with cx};
visit::visit_expr(expr, new_cx, visitor);
}
_ { visit::visit_expr(expr, cx, visitor); }
}
}
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(),
parent: pa_item(item.id)
parent: pa_item(item.id),
parent_fn: some(item.id)
with cx};
visit::visit_item(item, new_cx, visitor);
}
@ -219,17 +235,20 @@ fn resolve_crate(sess: session, def_map: resolve::def_map, crate: @ast::crate)
let cx: ctxt = {sess: sess,
def_map: def_map,
region_map: @{parent_blocks: map::new_int_hash(),
parent_fns: map::new_int_hash(),
ast_type_to_region: map::new_int_hash(),
local_blocks: map::new_int_hash()},
names_in_scope: map::new_str_hash(),
mut queued_locals: [],
parent: pa_crate};
parent: pa_crate,
mut parent_fn: none};
let visitor = visit::mk_vt(@{
visit_block: resolve_block,
visit_item: resolve_item,
visit_ty: resolve_ty,
visit_arm: resolve_arm,
visit_pat: resolve_pat
visit_pat: resolve_pat,
visit_expr: resolve_expr
with *visit::default_visitor()
});
visit::visit_crate(*crate, cx, visitor);