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ast: Stop using Mod in Crate

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Crate root is sufficiently different from `mod` items, at least at syntactic level.

Also remove customization point for "`mod` item or crate root" from AST visitors.
This commit is contained in:
Vadim Petrochenkov 2021-02-14 21:14:12 +03:00
parent d1462d8558
commit eb65f15c78
23 changed files with 114 additions and 179 deletions
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2
compiler/rustc_ast/src/ast.rs
View File

@ -486,8 +486,8 @@ pub struct WhereEqPredicate {
#[derive(Clone, Encodable, Decodable, Debug)]
pub struct Crate {
pub module: Mod,
pub attrs: Vec<Attribute>,
pub items: Vec<P<Item>>,
pub span: Span,
/// The order of items in the HIR is unrelated to the order of
/// items in the AST. However, we generate proc macro harnesses

27
compiler/rustc_ast/src/mut_visit.rs
View File

@ -170,10 +170,6 @@ pub trait MutVisitor: Sized {
noop_visit_ty_constraint(t, self);
}
fn visit_mod(&mut self, m: &mut Mod) {
noop_visit_mod(m, self);
}
fn visit_foreign_mod(&mut self, nm: &mut ForeignMod) {
noop_visit_foreign_mod(nm, self);
}
@ -917,7 +913,11 @@ pub fn noop_visit_item_kind<T: MutVisitor>(kind: &mut ItemKind, vis: &mut T) {
vis.visit_generics(generics);
visit_opt(body, |body| vis.visit_block(body));
}
ItemKind::Mod(m) => vis.visit_mod(m),
ItemKind::Mod(m) => {
let Mod { inner, unsafety: _, items, inline: _ } = m;
vis.visit_span(inner);
items.flat_map_in_place(|item| vis.flat_map_item(item));
}
ItemKind::ForeignMod(nm) => vis.visit_foreign_mod(nm),
ItemKind::GlobalAsm(_ga) => {}
ItemKind::TyAlias(box TyAliasKind(_, generics, bounds, ty)) => {
@ -998,14 +998,10 @@ pub fn noop_visit_fn_header<T: MutVisitor>(header: &mut FnHeader, vis: &mut T) {
vis.visit_asyncness(asyncness);
}
pub fn noop_visit_mod<T: MutVisitor>(module: &mut Mod, vis: &mut T) {
let Mod { inner, unsafety: _, items, inline: _ } = module;
vis.visit_span(inner);
items.flat_map_in_place(|item| vis.flat_map_item(item));
}
// FIXME: Avoid visiting the crate as a `Mod` item, flat map only the inner items if possible,
// or make crate visiting first class if necessary.
pub fn noop_visit_crate<T: MutVisitor>(krate: &mut Crate, vis: &mut T) {
visit_clobber(krate, |Crate { module, attrs, span, proc_macros }| {
visit_clobber(krate, |Crate { attrs, items, span, proc_macros }| {
let item_vis =
Visibility { kind: VisibilityKind::Public, span: span.shrink_to_lo(), tokens: None };
let item = P(Item {
@ -1014,19 +1010,18 @@ pub fn noop_visit_crate<T: MutVisitor>(krate: &mut Crate, vis: &mut T) {
id: DUMMY_NODE_ID,
vis: item_vis,
span,
kind: ItemKind::Mod(module),
kind: ItemKind::Mod(Mod { inner: span, unsafety: Unsafe::No, items, inline: true }),
tokens: None,
});
let items = vis.flat_map_item(item);
let len = items.len();
if len == 0 {
let module = Mod { inner: span, unsafety: Unsafe::No, items: vec![], inline: true };
Crate { module, attrs: vec![], span, proc_macros }
Crate { attrs: vec![], items: vec![], span, proc_macros }
} else if len == 1 {
let Item { attrs, span, kind, .. } = items.into_iter().next().unwrap().into_inner();
match kind {
ItemKind::Mod(module) => Crate { module, attrs, span, proc_macros },
ItemKind::Mod(module) => Crate { attrs, items: module.items, span, proc_macros },
_ => panic!("visitor converted a module to not a module"),
}
} else {

13
compiler/rustc_ast/src/visit.rs
View File

@ -74,7 +74,7 @@ impl<'a> FnKind<'a> {
/// Each method of the `Visitor` trait is a hook to be potentially
/// overridden. Each method's default implementation recursively visits
/// the substructure of the input via the corresponding `walk` method;
/// e.g., the `visit_mod` method by default calls `visit::walk_mod`.
/// e.g., the `visit_item` method by default calls `visit::walk_item`.
///
/// If you want to ensure that your code handles every variant
/// explicitly, you need to override each method. (And you also need
@ -87,9 +87,6 @@ pub trait Visitor<'ast>: Sized {
fn visit_ident(&mut self, ident: Ident) {
walk_ident(self, ident);
}
fn visit_mod(&mut self, m: &'ast Mod, _s: Span, _attrs: &[Attribute], _n: NodeId) {
walk_mod(self, m);
}
fn visit_foreign_item(&mut self, i: &'ast ForeignItem) {
walk_foreign_item(self, i)
}
@ -238,14 +235,10 @@ pub fn walk_ident<'a, V: Visitor<'a>>(visitor: &mut V, ident: Ident) {
}
pub fn walk_crate<'a, V: Visitor<'a>>(visitor: &mut V, krate: &'a Crate) {
visitor.visit_mod(&krate.module, krate.span, &krate.attrs, CRATE_NODE_ID);
walk_list!(visitor, visit_item, &krate.items);
walk_list!(visitor, visit_attribute, &krate.attrs);
}
pub fn walk_mod<'a, V: Visitor<'a>>(visitor: &mut V, module: &'a Mod) {
walk_list!(visitor, visit_item, &module.items);
}
pub fn walk_local<'a, V: Visitor<'a>>(visitor: &mut V, local: &'a Local) {
for attr in local.attrs.iter() {
visitor.visit_attribute(attr);
@ -297,7 +290,7 @@ pub fn walk_item<'a, V: Visitor<'a>>(visitor: &mut V, item: &'a Item) {
let kind = FnKind::Fn(FnCtxt::Free, item.ident, sig, &item.vis, body.as_deref());
visitor.visit_fn(kind, item.span, item.id)
}
ItemKind::Mod(ref module) => visitor.visit_mod(module, item.span, &item.attrs, item.id),
ItemKind::Mod(ref module) => walk_list!(visitor, visit_item, &module.items),
ItemKind::ForeignMod(ref foreign_module) => {
walk_list!(visitor, visit_foreign_item, &foreign_module.items);
}

57
compiler/rustc_ast_lowering/src/item.rs
View File

@ -15,11 +15,11 @@ use rustc_span::source_map::{respan, DesugaringKind};
use rustc_span::symbol::{kw, sym, Ident};
use rustc_span::Span;
use rustc_target::spec::abi;
use smallvec::{smallvec, SmallVec};
use std::collections::BTreeSet;
use tracing::debug;
use std::mem;
pub(super) struct ItemLowerer<'a, 'lowering, 'hir> {
pub(super) lctx: &'a mut LoweringContext<'lowering, 'hir>,
}
@ -34,25 +34,6 @@ impl ItemLowerer<'_, '_, '_> {
}
impl<'a> Visitor<'a> for ItemLowerer<'a, '_, '_> {
fn visit_mod(&mut self, m: &'a Mod, _s: Span, _attrs: &[Attribute], n: NodeId) {
let def_id = self.lctx.lower_node_id(n).expect_owner();
self.lctx.modules.insert(
def_id,
hir::ModuleItems {
items: BTreeSet::new(),
trait_items: BTreeSet::new(),
impl_items: BTreeSet::new(),
foreign_items: BTreeSet::new(),
},
);
let old = self.lctx.current_module;
self.lctx.current_module = def_id;
visit::walk_mod(self, m);
self.lctx.current_module = old;
}
fn visit_item(&mut self, item: &'a Item) {
let mut item_hir_id = None;
self.lctx.with_hir_id_owner(item.id, |lctx| {
@ -67,10 +48,18 @@ impl<'a> Visitor<'a> for ItemLowerer<'a, '_, '_> {
if let Some(hir_id) = item_hir_id {
self.lctx.with_parent_item_lifetime_defs(hir_id, |this| {
let this = &mut ItemLowerer { lctx: this };
if let ItemKind::Impl(box ImplKind { ref of_trait, .. }) = item.kind {
this.with_trait_impl_ref(of_trait, |this| visit::walk_item(this, item));
} else {
visit::walk_item(this, item);
match item.kind {
ItemKind::Mod(..) => {
let def_id = this.lctx.lower_node_id(item.id).expect_owner();
let old_current_module =
mem::replace(&mut this.lctx.current_module, def_id);
visit::walk_item(this, item);
this.lctx.current_module = old_current_module;
}
ItemKind::Impl(box ImplKind { ref of_trait, .. }) => {
this.with_trait_impl_ref(of_trait, |this| visit::walk_item(this, item));
}
_ => visit::walk_item(this, item),
}
});
}
@ -94,13 +83,13 @@ impl<'a> Visitor<'a> for ItemLowerer<'a, '_, '_> {
let hir_item = lctx.lower_trait_item(item);
let id = hir_item.trait_item_id();
lctx.trait_items.insert(id, hir_item);
lctx.modules.get_mut(&lctx.current_module).unwrap().trait_items.insert(id);
lctx.modules.entry(lctx.current_module).or_default().trait_items.insert(id);
}
AssocCtxt::Impl => {
let hir_item = lctx.lower_impl_item(item);
let id = hir_item.impl_item_id();
lctx.impl_items.insert(id, hir_item);
lctx.modules.get_mut(&lctx.current_module).unwrap().impl_items.insert(id);
lctx.modules.entry(lctx.current_module).or_default().impl_items.insert(id);
}
});
@ -113,7 +102,7 @@ impl<'a> Visitor<'a> for ItemLowerer<'a, '_, '_> {
let hir_item = lctx.lower_foreign_item(item);
let id = hir_item.foreign_item_id();
lctx.foreign_items.insert(id, hir_item);
lctx.modules.get_mut(&lctx.current_module).unwrap().foreign_items.insert(id);
lctx.modules.entry(lctx.current_module).or_default().foreign_items.insert(id);
});
visit::walk_foreign_item(self, item);
@ -157,7 +146,7 @@ impl<'hir> LoweringContext<'_, 'hir> {
&mut self,
f: impl FnOnce(&mut LoweringContext<'_, '_>) -> T,
) -> T {
let old_in_scope_lifetimes = std::mem::replace(&mut self.in_scope_lifetimes, vec![]);
let old_in_scope_lifetimes = mem::replace(&mut self.in_scope_lifetimes, vec![]);
// this vector is only used when walking over impl headers,
// input types, and the like, and should not be non-empty in
@ -172,12 +161,10 @@ impl<'hir> LoweringContext<'_, 'hir> {
res
}
pub(super) fn lower_mod(&mut self, m: &Mod) -> hir::Mod<'hir> {
pub(super) fn lower_mod(&mut self, items: &[P<Item>], inner: Span) -> hir::Mod<'hir> {
hir::Mod {
inner: m.inner,
item_ids: self
.arena
.alloc_from_iter(m.items.iter().flat_map(|x| self.lower_item_id(x))),
inner,
item_ids: self.arena.alloc_from_iter(items.iter().flat_map(|x| self.lower_item_id(x))),
}
}
@ -327,7 +314,7 @@ impl<'hir> LoweringContext<'_, 'hir> {
hir::ItemKind::Fn(sig, generics, body_id)
})
}
ItemKind::Mod(ref m) => hir::ItemKind::Mod(self.lower_mod(m)),
ItemKind::Mod(ref m) => hir::ItemKind::Mod(self.lower_mod(&m.items, m.inner)),
ItemKind::ForeignMod(ref fm) => {
if fm.abi.is_none() {
self.maybe_lint_missing_abi(span, id, abi::Abi::C);

4
compiler/rustc_ast_lowering/src/lib.rs
View File

@ -560,7 +560,7 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
visit::walk_crate(&mut MiscCollector { lctx: &mut self }, c);
visit::walk_crate(&mut item::ItemLowerer { lctx: &mut self }, c);
let module = self.lower_mod(&c.module);
let module = self.lower_mod(&c.items, c.span);
let attrs = self.lower_attrs(&c.attrs);
let body_ids = body_ids(&self.bodies);
let proc_macros =
@ -608,7 +608,7 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
fn insert_item(&mut self, item: hir::Item<'hir>) -> hir::ItemId {
let id = hir::ItemId { def_id: item.def_id };
self.items.insert(id, item);
self.modules.get_mut(&self.current_module).unwrap().items.insert(id);
self.modules.entry(self.current_module).or_default().items.insert(id);
id
}

4
compiler/rustc_ast_passes/src/node_count.rs
View File

@ -20,10 +20,6 @@ impl<'ast> Visitor<'ast> for NodeCounter {
self.count += 1;
walk_ident(self, ident);
}
fn visit_mod(&mut self, m: &Mod, _s: Span, _a: &[Attribute], _n: NodeId) {
self.count += 1;
walk_mod(self, m)
}
fn visit_foreign_item(&mut self, i: &ForeignItem) {
self.count += 1;
walk_foreign_item(self, i)

17
compiler/rustc_ast_pretty/src/pprust/state.rs
View File

@ -132,7 +132,10 @@ pub fn print_crate<'a>(
}
}
s.print_mod(&krate.module, &krate.attrs);
s.print_inner_attributes(&krate.attrs);
for item in &krate.items {
s.print_item(item);
}
s.print_remaining_comments();
s.ann.post(&mut s, AnnNode::Crate(krate));
s.s.eof()
@ -891,13 +894,6 @@ impl<'a> State<'a> {
self.commasep_cmnt(b, exprs, |s, e| s.print_expr(e), |e| e.span)
}
pub fn print_mod(&mut self, _mod: &ast::Mod, attrs: &[ast::Attribute]) {
self.print_inner_attributes(attrs);
for item in &_mod.items {
self.print_item(item);
}
}
crate fn print_foreign_mod(&mut self, nmod: &ast::ForeignMod, attrs: &[ast::Attribute]) {
self.print_inner_attributes(attrs);
for item in &nmod.items {
@ -1149,7 +1145,10 @@ impl<'a> State<'a> {
if _mod.inline || self.is_expanded {
self.nbsp();
self.bopen();
self.print_mod(_mod, &item.attrs);
self.print_inner_attributes(&item.attrs);
for item in &_mod.items {
self.print_item(item);
}
self.bclose(item.span);
} else {
self.s.word(";");

2
compiler/rustc_builtin_macros/src/proc_macro_harness.rs
View File

@ -91,7 +91,7 @@ pub fn inject(
}
let decls = mk_decls(&mut krate, &mut cx, &macros);
krate.module.items.push(decls);
krate.items.push(decls);
krate
}

4
compiler/rustc_builtin_macros/src/standard_library_imports.rs
View File

@ -44,7 +44,7 @@ pub fn inject(
// .rev() to preserve ordering above in combination with insert(0, ...)
for &name in names.iter().rev() {
let ident = if rust_2018 { Ident::new(name, span) } else { Ident::new(name, call_site) };
krate.module.items.insert(
krate.items.insert(
0,
cx.item(
span,
@ -79,7 +79,7 @@ pub fn inject(
})),
);
krate.module.items.insert(0, use_item);
krate.items.insert(0, use_item);
krate
}

10
compiler/rustc_builtin_macros/src/test_harness.rs
View File

@ -89,7 +89,7 @@ impl<'a> MutVisitor for TestHarnessGenerator<'a> {
noop_visit_crate(c, self);
// Create a main function to run our tests
c.module.items.push(mk_main(&mut self.cx));
c.items.push(mk_main(&mut self.cx));
}
fn flat_map_item(&mut self, i: P<ast::Item>) -> SmallVec<[P<ast::Item>; 1]> {
@ -103,9 +103,13 @@ impl<'a> MutVisitor for TestHarnessGenerator<'a> {
// We don't want to recurse into anything other than mods, since
// mods or tests inside of functions will break things
if let ast::ItemKind::Mod(mut module) = item.kind {
if let ast::ItemKind::Mod(..) = item.kind {
let tests = mem::take(&mut self.tests);
noop_visit_mod(&mut module, self);
noop_visit_item_kind(&mut item.kind, self);
let module = match item.kind {
ast::ItemKind::Mod(module) => module,
_ => unreachable!(),
};
let mut tests = mem::replace(&mut self.tests, tests);
if !tests.is_empty() {

2
compiler/rustc_expand/src/config.rs
View File

@ -209,7 +209,7 @@ pub fn features(sess: &Session, mut krate: ast::Crate) -> (ast::Crate, Features)
None => {
// The entire crate is unconfigured.
krate.attrs = Vec::new();
krate.module.items = Vec::new();
krate.items = Vec::new();
Features::default()
}
Some(attrs) => {

38
compiler/rustc_expand/src/expand.rs
View File

@ -350,6 +350,8 @@ impl<'a, 'b> MacroExpander<'a, 'b> {
MacroExpander { cx, monotonic }
}
// FIXME: Avoid visiting the crate as a `Mod` item,
// make crate a first class expansion target instead.
pub fn expand_crate(&mut self, mut krate: ast::Crate) -> ast::Crate {
let mut module = ModuleData {
mod_path: vec![Ident::from_str(&self.cx.ecfg.crate_name)],
@ -362,12 +364,15 @@ impl<'a, 'b> MacroExpander<'a, 'b> {
self.cx.root_path = module.directory.clone();
self.cx.current_expansion.module = Rc::new(module);
let orig_mod_span = krate.module.inner;
let krate_item = AstFragment::Items(smallvec![P(ast::Item {
attrs: krate.attrs,
span: krate.span,
kind: ast::ItemKind::Mod(krate.module),
kind: ast::ItemKind::Mod(ast::Mod {
inner: krate.span,
unsafety: Unsafe::No,
items: krate.items,
inline: true
}),
ident: Ident::invalid(),
id: ast::DUMMY_NODE_ID,
vis: ast::Visibility {
@ -381,26 +386,16 @@ impl<'a, 'b> MacroExpander<'a, 'b> {
match self.fully_expand_fragment(krate_item).make_items().pop().map(P::into_inner) {
Some(ast::Item { attrs, kind: ast::ItemKind::Mod(module), .. }) => {
krate.attrs = attrs;
krate.module = module;
krate.items = module.items;
}
None => {
// Resolution failed so we return an empty expansion
krate.attrs = vec![];
krate.module = ast::Mod {
inner: orig_mod_span,
unsafety: Unsafe::No,
items: vec![],
inline: true,
};
krate.items = vec![];
}
Some(ast::Item { span, kind, .. }) => {
krate.attrs = vec![];
krate.module = ast::Mod {
inner: orig_mod_span,
unsafety: Unsafe::No,
items: vec![],
inline: true,
};
krate.items = vec![];
self.cx.span_err(
span,
&format!(
@ -1284,7 +1279,7 @@ impl<'a, 'b> MutVisitor for InvocationCollector<'a, 'b> {
push_directory(&self.cx.sess, ident, &item.attrs, dir)
} else {
// We have an outline `mod foo;` so we need to parse the file.
let (new_mod, dir) = parse_external_mod(
let (ast::Mod { unsafety, inline, items, inner }, dir) = parse_external_mod(
&self.cx.sess,
ident,
span,
@ -1294,17 +1289,12 @@ impl<'a, 'b> MutVisitor for InvocationCollector<'a, 'b> {
pushed,
);
let krate = ast::Crate {
span: new_mod.inner,
module: new_mod,
attrs,
proc_macros: vec![],
};
let krate = ast::Crate { attrs, items, span: inner, proc_macros: vec![] };
if let Some(extern_mod_loaded) = self.cx.extern_mod_loaded {
extern_mod_loaded(&krate, ident);
}
*old_mod = krate.module;
*old_mod = ast::Mod { unsafety, inline, items: krate.items, inner };
item.attrs = krate.attrs;
// File can have inline attributes, e.g., `#![cfg(...)]` & co. => Reconfigure.
item = match self.configure(item) {

5
compiler/rustc_expand/src/module.rs
View File

@ -62,9 +62,8 @@ crate fn parse_external_mod(
// Actually parse the external file as a module.
let mut parser = new_parser_from_file(&sess.parse_sess, &mp.path, Some(span));
let mut module = parser.parse_mod(&token::Eof, unsafety)?;
module.0.inline = false;
module
let (inner_attrs, items, inner) = parser.parse_mod(&token::Eof)?;
(Mod { unsafety, inline: false, items, inner }, inner_attrs)
};
// (1) ...instead, we return a dummy module.
let (module, mut new_attrs) = result.map_err(|mut err| err.emit()).unwrap_or_else(|_| {

8
compiler/rustc_expand/src/mut_visit/tests.rs
View File

@ -7,8 +7,8 @@ use rustc_span::symbol::Ident;
use rustc_span::with_default_session_globals;
// This version doesn't care about getting comments or doc-strings in.
fn fake_print_crate(s: &mut pprust::State<'_>, krate: &ast::Crate) {
s.print_mod(&krate.module, &krate.attrs)
fn print_crate_items(krate: &ast::Crate) -> String {
krate.items.iter().map(|i| pprust::item_to_string(i)).collect::<Vec<_>>().join(" ")
}
// Change every identifier to "zz".
@ -46,7 +46,7 @@ fn ident_transformation() {
assert_pred!(
matches_codepattern,
"matches_codepattern",
pprust::to_string(|s| fake_print_crate(s, &krate)),
print_crate_items(&krate),
"#[zz]mod zz{fn zz(zz:zz,zz:zz){zz!(zz,zz,zz);zz;zz}}".to_string()
);
})
@ -66,7 +66,7 @@ fn ident_transformation_in_defs() {
assert_pred!(
matches_codepattern,
"matches_codepattern",
pprust::to_string(|s| fake_print_crate(s, &krate)),
print_crate_items(&krate),
"macro_rules! zz{(zz$zz:zz$(zz $zz:zz)zz+=>(zz$(zz$zz$zz)+))}".to_string()
);
})

2
compiler/rustc_hir/src/hir.rs
View File

@ -615,7 +615,7 @@ pub struct WhereEqPredicate<'hir> {
pub rhs_ty: &'hir Ty<'hir>,
}
#[derive(Encodable, Debug, HashStable_Generic)]
#[derive(Default, Encodable, Debug, HashStable_Generic)]
pub struct ModuleItems {
// Use BTreeSets here so items are in the same order as in the
// list of all items in Crate

7
compiler/rustc_lint/src/early.rs
View File

@ -188,13 +188,6 @@ impl<'a, T: EarlyLintPass> ast_visit::Visitor<'a> for EarlyContextAndPass<'a, T>
run_early_pass!(self, check_ident, ident);
}
fn visit_mod(&mut self, m: &'a ast::Mod, s: Span, _a: &[ast::Attribute], n: ast::NodeId) {
run_early_pass!(self, check_mod, m, s, n);
self.check_id(n);
ast_visit::walk_mod(self, m);
run_early_pass!(self, check_mod_post, m, s, n);
}
fn visit_local(&mut self, l: &'a ast::Local) {
self.with_lint_attrs(l.id, &l.attrs, |cx| {
run_early_pass!(cx, check_local, l);

2
compiler/rustc_lint/src/passes.rs
View File

@ -160,8 +160,6 @@ macro_rules! early_lint_methods {
fn check_ident(a: Ident);
fn check_crate(a: &ast::Crate);
fn check_crate_post(a: &ast::Crate);
fn check_mod(a: &ast::Mod, b: Span, c: ast::NodeId);
fn check_mod_post(a: &ast::Mod, b: Span, c: ast::NodeId);
fn check_foreign_item(a: &ast::ForeignItem);
fn check_foreign_item_post(a: &ast::ForeignItem);
fn check_item(a: &ast::Item);

31
compiler/rustc_parse/src/parser/item.rs
View File

@ -25,11 +25,9 @@ use tracing::debug;
impl<'a> Parser<'a> {
/// Parses a source module as a crate. This is the main entry point for the parser.
pub fn parse_crate_mod(&mut self) -> PResult<'a, ast::Crate> {
let lo = self.token.span;
let (module, attrs) = self.parse_mod(&token::Eof, Unsafe::No)?;
let span = lo.to(self.token.span);
let (attrs, items, span) = self.parse_mod(&token::Eof)?;
let proc_macros = Vec::new(); // Filled in by `proc_macro_harness::inject()`.
Ok(ast::Crate { attrs, module, span, proc_macros })
Ok(ast::Crate { attrs, items, span, proc_macros })
}
/// Parses a `mod <foo> { ... }` or `mod <foo>;` item.
@ -37,35 +35,24 @@ impl<'a> Parser<'a> {
let unsafety = self.parse_unsafety();
self.expect_keyword(kw::Mod)?;
let id = self.parse_ident()?;
let (module, mut inner_attrs) = if self.eat(&token::Semi) {
(Mod { inner: Span::default(), unsafety, items: Vec::new(), inline: false }, Vec::new())
let ((mut inner_attrs, items, inner), inline) = if self.eat(&token::Semi) {
((Vec::new(), Vec::new(), Span::default()), false)
} else {
self.expect(&token::OpenDelim(token::Brace))?;
self.parse_mod(&token::CloseDelim(token::Brace), unsafety)?
(self.parse_mod(&token::CloseDelim(token::Brace))?, true)
};
attrs.append(&mut inner_attrs);
Ok((id, ItemKind::Mod(module)))
Ok((id, ItemKind::Mod(Mod { unsafety, inline, items, inner })))
}
/// Parses the contents of a module (inner attributes followed by module items).
pub fn parse_mod(
&mut self,
term: &TokenKind,
unsafety: Unsafe,
) -> PResult<'a, (Mod, Vec<Attribute>)> {
) -> PResult<'a, (Vec<Attribute>, Vec<P<Item>>, Span)> {
let lo = self.token.span;
let attrs = self.parse_inner_attributes()?;
let module = self.parse_mod_items(term, lo, unsafety)?;
Ok((module, attrs))
}
/// Given a termination token, parses all of the items in a module.
fn parse_mod_items(
&mut self,
term: &TokenKind,
inner_lo: Span,
unsafety: Unsafe,
) -> PResult<'a, Mod> {
let mut items = vec![];
while let Some(item) = self.parse_item(ForceCollect::No)? {
items.push(item);
@ -82,9 +69,7 @@ impl<'a> Parser<'a> {
}
}
let hi = if self.token.span.is_dummy() { inner_lo } else { self.prev_token.span };
Ok(Mod { inner: inner_lo.to(hi), unsafety, items, inline: true })
Ok((attrs, items, lo.to(self.prev_token.span)))
}
}

10
compiler/rustc_passes/src/hir_stats.rs
View File

@ -124,11 +124,6 @@ impl<'v> hir_visit::Visitor<'v> for StatCollector<'v> {
hir_visit::walk_item(self, i)
}
fn visit_mod(&mut self, m: &'v hir::Mod<'v>, _s: Span, n: hir::HirId) {
self.record("Mod", Id::None, m);
hir_visit::walk_mod(self, m, n)
}
fn visit_foreign_item(&mut self, i: &'v hir::ForeignItem<'v>) {
self.record("ForeignItem", Id::Node(i.hir_id()), i);
hir_visit::walk_foreign_item(self, i)
@ -252,11 +247,6 @@ impl<'v> hir_visit::Visitor<'v> for StatCollector<'v> {
}
impl<'v> ast_visit::Visitor<'v> for StatCollector<'v> {
fn visit_mod(&mut self, m: &'v ast::Mod, _s: Span, _a: &[ast::Attribute], _n: NodeId) {
self.record("Mod", Id::None, m);
ast_visit::walk_mod(self, m)
}
fn visit_foreign_item(&mut self, i: &'v ast::ForeignItem) {
self.record("ForeignItem", Id::None, i);
ast_visit::walk_foreign_item(self, i)

38
compiler/rustc_resolve/src/lib.rs
View File

@ -11,6 +11,7 @@
#![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")]
#![feature(box_patterns)]
#![feature(bool_to_option)]
#![feature(control_flow_enum)]
#![feature(crate_visibility_modifier)]
#![feature(format_args_capture)]
#![feature(nll)]
@ -23,6 +24,7 @@ use Determinacy::*;
use rustc_arena::{DroplessArena, TypedArena};
use rustc_ast::node_id::NodeMap;
use rustc_ast::ptr::P;
use rustc_ast::unwrap_or;
use rustc_ast::visit::{self, Visitor};
use rustc_ast::{self as ast, NodeId};
@ -59,6 +61,7 @@ use rustc_span::{Span, DUMMY_SP};
use smallvec::{smallvec, SmallVec};
use std::cell::{Cell, RefCell};
use std::collections::BTreeSet;
use std::ops::ControlFlow;
use std::{cmp, fmt, iter, ptr};
use tracing::debug;
@ -283,28 +286,21 @@ struct UsePlacementFinder {
impl UsePlacementFinder {
fn check(krate: &Crate, target_module: NodeId) -> (Option<Span>, bool) {
let mut finder = UsePlacementFinder { target_module, span: None, found_use: false };
visit::walk_crate(&mut finder, krate);
if let ControlFlow::Continue(..) = finder.check_mod(&krate.items, CRATE_NODE_ID) {
visit::walk_crate(&mut finder, krate);
}
(finder.span, finder.found_use)
}
}
impl<'tcx> Visitor<'tcx> for UsePlacementFinder {
fn visit_mod(
&mut self,
module: &'tcx ast::Mod,
_: Span,
_: &[ast::Attribute],
node_id: NodeId,
) {
fn check_mod(&mut self, items: &[P<ast::Item>], node_id: NodeId) -> ControlFlow<()> {
if self.span.is_some() {
return;
return ControlFlow::Break(());
}
if node_id != self.target_module {
visit::walk_mod(self, module);
return;
return ControlFlow::Continue(());
}
// find a use statement
for item in &module.items {
for item in items {
match item.kind {
ItemKind::Use(..) => {
// don't suggest placing a use before the prelude
@ -312,7 +308,7 @@ impl<'tcx> Visitor<'tcx> for UsePlacementFinder {
if !item.span.from_expansion() {
self.span = Some(item.span.shrink_to_lo());
self.found_use = true;
return;
return ControlFlow::Break(());
}
}
// don't place use before extern crate
@ -337,6 +333,18 @@ impl<'tcx> Visitor<'tcx> for UsePlacementFinder {
}
}
}
ControlFlow::Continue(())
}
}
impl<'tcx> Visitor<'tcx> for UsePlacementFinder {
fn visit_item(&mut self, item: &'tcx ast::Item) {
if let ItemKind::Mod(module) = &item.kind {
if let ControlFlow::Break(..) = self.check_mod(&module.items, item.id) {
return;
}
}
visit::walk_item(self, item);
}
}

2
src/test/ui/ast-json/ast-json-noexpand-output.stdout
View File

@ -1 +1 @@
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2
src/test/ui/ast-json/ast-json-output.stdout
View File

@ -1 +1 @@
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6
src/test/ui/issues/issue-49040.stderr
View File

@ -7,10 +7,8 @@ LL | #![allow(unused_variables)];
error[E0601]: `main` function not found in crate `issue_49040`
--> $DIR/issue-49040.rs:1:1
|
LL | / #![allow(unused_variables)];
LL | |
LL | | fn foo() {}
| |__^ consider adding a `main` function to `$DIR/issue-49040.rs`
LL | #![allow(unused_variables)];
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ consider adding a `main` function to `$DIR/issue-49040.rs`
error: aborting due to 2 previous errors