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ast: Keep expansion status for out-of-line module items

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Also remove `ast::Mod` which is mostly redundant now
This commit is contained in:
Vadim Petrochenkov 2021-02-17 00:56:07 +03:00
parent eb65f15c78
commit 4a88165124
14 changed files with 147 additions and 125 deletions
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33
compiler/rustc_ast/src/ast.rs
View File

@ -2299,21 +2299,22 @@ impl FnRetTy {
}
}
/// Module declaration.
///
/// E.g., `mod foo;` or `mod foo { .. }`.
#[derive(Clone, PartialEq, Encodable, Decodable, Debug)]
pub enum Inline {
Yes,
No,
}
/// Module item kind.
#[derive(Clone, Encodable, Decodable, Debug)]
pub struct Mod {
/// A span from the first token past `{` to the last token until `}`.
/// For `mod foo;`, the inner span ranges from the first token
/// to the last token in the external file.
pub inner: Span,
/// `unsafe` keyword accepted syntactically for macro DSLs, but not
/// semantically by Rust.
pub unsafety: Unsafe,
pub items: Vec<P<Item>>,
/// `true` for `mod foo { .. }`; `false` for `mod foo;`.
pub inline: bool,
pub enum ModKind {
/// Module with inlined definition `mod foo { ... }`,
/// or with definition outlined to a separate file `mod foo;` and already loaded from it.
/// The inner span is from the first token past `{` to the last token until `}`,
/// or from the first to the last token in the loaded file.
Loaded(Vec<P<Item>>, Inline, Span),
/// Module with definition outlined to a separate file `mod foo;` but not yet loaded from it.
Unloaded,
}
/// Foreign module declaration.
@ -2710,7 +2711,9 @@ pub enum ItemKind {
/// A module declaration (`mod`).
///
/// E.g., `mod foo;` or `mod foo { .. }`.
Mod(Mod),
/// `unsafe` keyword on modules is accepted syntactically for macro DSLs, but not
/// semantically by Rust.
Mod(Unsafe, ModKind),
/// An external module (`extern`).
///
/// E.g., `extern {}` or `extern "C" {}`.

18
compiler/rustc_ast/src/mut_visit.rs
View File

@ -913,11 +913,13 @@ 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) => {
let Mod { inner, unsafety: _, items, inline: _ } = m;
vis.visit_span(inner);
items.flat_map_in_place(|item| vis.flat_map_item(item));
}
ItemKind::Mod(_unsafety, mod_kind) => match mod_kind {
ModKind::Loaded(items, _inline, inner_span) => {
vis.visit_span(inner_span);
items.flat_map_in_place(|item| vis.flat_map_item(item));
}
ModKind::Unloaded => {}
},
ItemKind::ForeignMod(nm) => vis.visit_foreign_mod(nm),
ItemKind::GlobalAsm(_ga) => {}
ItemKind::TyAlias(box TyAliasKind(_, generics, bounds, ty)) => {
@ -1010,7 +1012,7 @@ pub fn noop_visit_crate<T: MutVisitor>(krate: &mut Crate, vis: &mut T) {
id: DUMMY_NODE_ID,
vis: item_vis,
span,
kind: ItemKind::Mod(Mod { inner: span, unsafety: Unsafe::No, items, inline: true }),
kind: ItemKind::Mod(Unsafe::No, ModKind::Loaded(items, Inline::Yes, span)),
tokens: None,
});
let items = vis.flat_map_item(item);
@ -1021,7 +1023,9 @@ pub fn noop_visit_crate<T: MutVisitor>(krate: &mut Crate, vis: &mut T) {
} else if len == 1 {
let Item { attrs, span, kind, .. } = items.into_iter().next().unwrap().into_inner();
match kind {
ItemKind::Mod(module) => Crate { attrs, items: module.items, span, proc_macros },
ItemKind::Mod(_, ModKind::Loaded(items, ..)) => {
Crate { attrs, items, span, proc_macros }
}
_ => panic!("visitor converted a module to not a module"),
}
} else {

7
compiler/rustc_ast/src/visit.rs
View File

@ -290,7 +290,12 @@ 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) => walk_list!(visitor, visit_item, &module.items),
ItemKind::Mod(_unsafety, ref mod_kind) => match mod_kind {
ModKind::Loaded(items, _inline, _inner_span) => {
walk_list!(visitor, visit_item, items)
}
ModKind::Unloaded => {}
},
ItemKind::ForeignMod(ref foreign_module) => {
walk_list!(visitor, visit_foreign_item, &foreign_module.items);
}

7
compiler/rustc_ast_lowering/src/item.rs
View File

@ -314,7 +314,12 @@ impl<'hir> LoweringContext<'_, 'hir> {
hir::ItemKind::Fn(sig, generics, body_id)
})
}
ItemKind::Mod(ref m) => hir::ItemKind::Mod(self.lower_mod(&m.items, m.inner)),
ItemKind::Mod(_, ref mod_kind) => match mod_kind {
ModKind::Loaded(items, _, inner_span) => {
hir::ItemKind::Mod(self.lower_mod(items, *inner_span))
}
ModKind::Unloaded => panic!("`mod` items should have been loaded by now"),
},
ItemKind::ForeignMod(ref fm) => {
if fm.abi.is_none() {
self.maybe_lint_missing_abi(span, id, abi::Abi::C);

6
compiler/rustc_ast_passes/src/ast_validation.rs
View File

@ -1054,12 +1054,14 @@ impl<'a> Visitor<'a> for AstValidator<'a> {
walk_list!(self, visit_attribute, &item.attrs);
return;
}
ItemKind::Mod(Mod { inline, unsafety, .. }) => {
ItemKind::Mod(unsafety, ref mod_kind) => {
if let Unsafe::Yes(span) = unsafety {
self.err_handler().span_err(span, "module cannot be declared unsafe");
}
// Ensure that `path` attributes on modules are recorded as used (cf. issue #35584).
if !inline && !self.session.contains_name(&item.attrs, sym::path) {
if !matches!(mod_kind, ModKind::Loaded(_, Inline::Yes, _))
&& !self.session.contains_name(&item.attrs, sym::path)
{
self.check_mod_file_item_asciionly(item.ident);
}
}

42
compiler/rustc_ast_pretty/src/pprust/state.rs
View File

@ -9,7 +9,7 @@ use rustc_ast::util::classify;
use rustc_ast::util::comments::{gather_comments, Comment, CommentStyle};
use rustc_ast::util::parser::{self, AssocOp, Fixity};
use rustc_ast::{self as ast, BlockCheckMode, PatKind, RangeEnd, RangeSyntax};
use rustc_ast::{GenericArg, MacArgs};
use rustc_ast::{GenericArg, MacArgs, ModKind};
use rustc_ast::{GenericBound, SelfKind, TraitBoundModifier};
use rustc_ast::{InlineAsmOperand, InlineAsmRegOrRegClass};
use rustc_ast::{InlineAsmOptions, InlineAsmTemplatePiece};
@ -87,7 +87,6 @@ pub struct State<'a> {
pub s: pp::Printer,
comments: Option<Comments<'a>>,
ann: &'a (dyn PpAnn + 'a),
is_expanded: bool,
}
crate const INDENT_UNIT: usize = 4;
@ -103,12 +102,8 @@ pub fn print_crate<'a>(
is_expanded: bool,
edition: Edition,
) -> String {
let mut s = State {
s: pp::mk_printer(),
comments: Some(Comments::new(sm, filename, input)),
ann,
is_expanded,
};
let mut s =
State { s: pp::mk_printer(), comments: Some(Comments::new(sm, filename, input)), ann };
if is_expanded && !krate.attrs.iter().any(|attr| attr.has_name(sym::no_core)) {
// We need to print `#![no_std]` (and its feature gate) so that
@ -856,7 +851,7 @@ impl<'a> PrintState<'a> for State<'a> {
impl<'a> State<'a> {
pub fn new() -> State<'a> {
State { s: pp::mk_printer(), comments: None, ann: &NoAnn, is_expanded: false }
State { s: pp::mk_printer(), comments: None, ann: &NoAnn }
}
// Synthesizes a comment that was not textually present in the original source
@ -1134,26 +1129,29 @@ impl<'a> State<'a> {
let body = body.as_deref();
self.print_fn_full(sig, item.ident, gen, &item.vis, def, body, &item.attrs);
}
ast::ItemKind::Mod(ref _mod) => {
ast::ItemKind::Mod(unsafety, ref mod_kind) => {
self.head(self.to_string(|s| {
s.print_visibility(&item.vis);
s.print_unsafety(_mod.unsafety);
s.print_unsafety(unsafety);
s.word("mod");
}));
self.print_ident(item.ident);
if _mod.inline || self.is_expanded {
self.nbsp();
self.bopen();
self.print_inner_attributes(&item.attrs);
for item in &_mod.items {
self.print_item(item);
match mod_kind {
ModKind::Loaded(items, ..) => {
self.nbsp();
self.bopen();
self.print_inner_attributes(&item.attrs);
for item in items {
self.print_item(item);
}
self.bclose(item.span);
}
ModKind::Unloaded => {
self.s.word(";");
self.end(); // end inner head-block
self.end(); // end outer head-block
}
self.bclose(item.span);
} else {
self.s.word(";");
self.end(); // end inner head-block
self.end(); // end outer head-block
}
}
ast::ItemKind::ForeignMod(ref nmod) => {

13
compiler/rustc_builtin_macros/src/test_harness.rs
View File

@ -1,10 +1,10 @@
// Code that generates a test runner to run all the tests in a crate
use rustc_ast as ast;
use rustc_ast::attr;
use rustc_ast::entry::EntryPointType;
use rustc_ast::mut_visit::{ExpectOne, *};
use rustc_ast::ptr::P;
use rustc_ast::{attr, ModKind};
use rustc_expand::base::{ExtCtxt, ResolverExpand};
use rustc_expand::expand::{AstFragment, ExpansionConfig};
use rustc_feature::Features;
@ -106,10 +106,6 @@ impl<'a> MutVisitor for TestHarnessGenerator<'a> {
if let ast::ItemKind::Mod(..) = item.kind {
let tests = mem::take(&mut self.tests);
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() {
@ -117,8 +113,12 @@ impl<'a> MutVisitor for TestHarnessGenerator<'a> {
if item.id == ast::DUMMY_NODE_ID { ast::CRATE_NODE_ID } else { item.id };
// Create an identifier that will hygienically resolve the test
// case name, even in another module.
let inner_span = match item.kind {
ast::ItemKind::Mod(_, ModKind::Loaded(.., span)) => span,
_ => unreachable!(),
};
let expn_id = self.cx.ext_cx.resolver.expansion_for_ast_pass(
module.inner,
inner_span,
AstPass::TestHarness,
&[],
Some(parent),
@ -130,7 +130,6 @@ impl<'a> MutVisitor for TestHarnessGenerator<'a> {
}
self.cx.test_cases.extend(tests);
}
item.kind = ast::ItemKind::Mod(module);
}
smallvec![P(item)]
}

90
compiler/rustc_expand/src/expand.rs
View File

@ -12,8 +12,8 @@ use rustc_ast::ptr::P;
use rustc_ast::token;
use rustc_ast::tokenstream::TokenStream;
use rustc_ast::visit::{self, AssocCtxt, Visitor};
use rustc_ast::{AttrItem, AttrStyle, Block, ItemKind, LitKind, MacArgs};
use rustc_ast::{MacCallStmt, MacStmtStyle, MetaItemKind, NestedMetaItem};
use rustc_ast::{AttrItem, AttrStyle, Block, Inline, ItemKind, LitKind, MacArgs};
use rustc_ast::{MacCallStmt, MacStmtStyle, MetaItemKind, ModKind, NestedMetaItem};
use rustc_ast::{NodeId, PatKind, Path, StmtKind, Unsafe};
use rustc_ast_pretty::pprust;
use rustc_attr::{self as attr, is_builtin_attr, HasAttrs};
@ -367,12 +367,10 @@ impl<'a, 'b> MacroExpander<'a, 'b> {
let krate_item = AstFragment::Items(smallvec![P(ast::Item {
attrs: krate.attrs,
span: krate.span,
kind: ast::ItemKind::Mod(ast::Mod {
inner: krate.span,
unsafety: Unsafe::No,
items: krate.items,
inline: true
}),
kind: ast::ItemKind::Mod(
Unsafe::No,
ModKind::Loaded(krate.items, Inline::Yes, krate.span)
),
ident: Ident::invalid(),
id: ast::DUMMY_NODE_ID,
vis: ast::Visibility {
@ -384,9 +382,13 @@ 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), .. }) => {
Some(ast::Item {
attrs,
kind: ast::ItemKind::Mod(_, ModKind::Loaded(items, ..)),
..
}) => {
krate.attrs = attrs;
krate.items = module.items;
krate.items = items;
}
None => {
// Resolution failed so we return an empty expansion
@ -809,7 +811,9 @@ impl<'a, 'b> MacroExpander<'a, 'b> {
impl<'ast, 'a> Visitor<'ast> for GateProcMacroInput<'a> {
fn visit_item(&mut self, item: &'ast ast::Item) {
match &item.kind {
ast::ItemKind::Mod(module) if !module.inline => {
ast::ItemKind::Mod(_, mod_kind)
if !matches!(mod_kind, ModKind::Loaded(_, Inline::Yes, _)) =>
{
feature_err(
self.parse_sess,
sym::proc_macro_hygiene,
@ -1266,47 +1270,47 @@ impl<'a, 'b> MutVisitor for InvocationCollector<'a, 'b> {
_ => unreachable!(),
})
}
ast::ItemKind::Mod(ref mut old_mod @ ast::Mod { .. }) if ident != Ident::invalid() => {
ast::ItemKind::Mod(_, ref mut mod_kind) if ident != Ident::invalid() => {
let sess = &self.cx.sess.parse_sess;
let orig_ownership = self.cx.current_expansion.directory_ownership;
let mut module = (*self.cx.current_expansion.module).clone();
let pushed = &mut false; // Record `parse_external_mod` pushing so we can pop.
let dir = Directory { ownership: orig_ownership, path: module.directory };
let Directory { ownership, path } = if old_mod.inline {
// Inline `mod foo { ... }`, but we still need to push directories.
item.attrs = attrs;
push_directory(&self.cx.sess, ident, &item.attrs, dir)
} else {
// We have an outline `mod foo;` so we need to parse the file.
let (ast::Mod { unsafety, inline, items, inner }, dir) = parse_external_mod(
&self.cx.sess,
ident,
span,
old_mod.unsafety,
dir,
&mut attrs,
pushed,
);
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);
let Directory { ownership, path } = match mod_kind {
ModKind::Loaded(_, Inline::Yes, _) => {
// Inline `mod foo { ... }`, but we still need to push directories.
item.attrs = attrs;
push_directory(&self.cx.sess, ident, &item.attrs, dir)
}
ModKind::Loaded(_, Inline::No, _) => {
panic!("`mod` item is loaded from a file for the second time")
}
ModKind::Unloaded => {
// We have an outline `mod foo;` so we need to parse the file.
let (items, inner_span, dir) =
parse_external_mod(&self.cx.sess, ident, span, dir, &mut attrs, pushed);
*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) {
Some(node) => node,
None => {
if *pushed {
sess.included_mod_stack.borrow_mut().pop();
}
return Default::default();
let krate =
ast::Crate { attrs, items, span: inner_span, proc_macros: vec![] };
if let Some(extern_mod_loaded) = self.cx.extern_mod_loaded {
extern_mod_loaded(&krate, ident);
}
};
dir
*mod_kind = ModKind::Loaded(krate.items, Inline::No, inner_span);
item.attrs = krate.attrs;
// File can have inline attributes, e.g., `#![cfg(...)]` & co. => Reconfigure.
item = match self.configure(item) {
Some(node) => node,
None => {
if *pushed {
sess.included_mod_stack.borrow_mut().pop();
}
return Default::default();
}
};
dir
}
};
// Set the module info before we flat map.

23
compiler/rustc_expand/src/module.rs
View File

@ -1,4 +1,5 @@
use rustc_ast::{token, Attribute, Mod, Unsafe};
use rustc_ast::ptr::P;
use rustc_ast::{token, Attribute, Item};
use rustc_errors::{struct_span_err, PResult};
use rustc_parse::new_parser_from_file;
use rustc_session::parse::ParseSess;
@ -42,11 +43,10 @@ crate fn parse_external_mod(
sess: &Session,
id: Ident,
span: Span, // The span to blame on errors.
unsafety: Unsafe,
Directory { mut ownership, path }: Directory,
attrs: &mut Vec<Attribute>,
pop_mod_stack: &mut bool,
) -> (Mod, Directory) {
) -> (Vec<P<Item>>, Span, Directory) {
// We bail on the first error, but that error does not cause a fatal error... (1)
let result: PResult<'_, _> = try {
// Extract the file path and the new ownership.
@ -62,25 +62,22 @@ 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 (inner_attrs, items, inner) = parser.parse_mod(&token::Eof)?;
(Mod { unsafety, inline: false, items, inner }, inner_attrs)
let (mut inner_attrs, items, inner_span) = parser.parse_mod(&token::Eof)?;
attrs.append(&mut inner_attrs);
(items, inner_span)
};
// (1) ...instead, we return a dummy module.
let (module, mut new_attrs) = result.map_err(|mut err| err.emit()).unwrap_or_else(|_| {
let module = Mod { inner: Span::default(), unsafety, items: Vec::new(), inline: false };
(module, Vec::new())
});
attrs.append(&mut new_attrs);
let (items, inner_span) = result.map_err(|mut err| err.emit()).unwrap_or_default();
// Extract the directory path for submodules of `module`.
let path = sess.source_map().span_to_unmapped_path(module.inner);
// Extract the directory path for submodules of the module.
let path = sess.source_map().span_to_unmapped_path(inner_span);
let mut path = match path {
FileName::Real(name) => name.into_local_path(),
other => PathBuf::from(other.to_string()),
};
path.pop();
(module, Directory { ownership, path })
(items, inner_span, Directory { ownership, path })
}
fn error_on_circular_module<'a>(

4
compiler/rustc_expand/src/parse/tests.rs
View File

@ -309,8 +309,8 @@ fn out_of_line_mod() {
.unwrap()
.unwrap();
if let ast::ItemKind::Mod(ref m) = item.kind {
assert!(m.items.len() == 2);
if let ast::ItemKind::Mod(_, ref mod_kind) = item.kind {
assert!(matches!(mod_kind, ast::ModKind::Loaded(items, ..) if items.len() == 2));
} else {
panic!();
}

12
compiler/rustc_parse/src/parser/item.rs
View File

@ -35,14 +35,16 @@ impl<'a> Parser<'a> {
let unsafety = self.parse_unsafety();
self.expect_keyword(kw::Mod)?;
let id = self.parse_ident()?;
let ((mut inner_attrs, items, inner), inline) = if self.eat(&token::Semi) {
((Vec::new(), Vec::new(), Span::default()), false)
let mod_kind = if self.eat(&token::Semi) {
ModKind::Unloaded
} else {
self.expect(&token::OpenDelim(token::Brace))?;
(self.parse_mod(&token::CloseDelim(token::Brace))?, true)
let (mut inner_attrs, items, inner_span) =
self.parse_mod(&token::CloseDelim(token::Brace))?;
attrs.append(&mut inner_attrs);
ModKind::Loaded(items, Inline::Yes, inner_span)
};
attrs.append(&mut inner_attrs);
Ok((id, ItemKind::Mod(Mod { unsafety, inline, items, inner })))
Ok((id, ItemKind::Mod(unsafety, mod_kind)))
}
/// Parses the contents of a module (inner attributes followed by module items).

2
compiler/rustc_resolve/src/late.rs
View File

@ -1023,7 +1023,7 @@ impl<'a: 'ast, 'b, 'ast> LateResolutionVisitor<'a, 'b, 'ast> {
});
}
ItemKind::Mod(_) | ItemKind::ForeignMod(_) => {
ItemKind::Mod(..) | ItemKind::ForeignMod(_) => {
self.with_scope(item.id, |this| {
visit::walk_item(this, item);
});

6
compiler/rustc_resolve/src/lib.rs
View File

@ -29,7 +29,7 @@ use rustc_ast::unwrap_or;
use rustc_ast::visit::{self, Visitor};
use rustc_ast::{self as ast, NodeId};
use rustc_ast::{Crate, CRATE_NODE_ID};
use rustc_ast::{ItemKind, Path};
use rustc_ast::{ItemKind, ModKind, Path};
use rustc_ast_lowering::ResolverAstLowering;
use rustc_ast_pretty::pprust;
use rustc_data_structures::fx::{FxHashMap, FxHashSet, FxIndexMap};
@ -339,8 +339,8 @@ impl UsePlacementFinder {
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) {
if let ItemKind::Mod(_, ModKind::Loaded(items, ..)) = &item.kind {
if let ControlFlow::Break(..) = self.check_mod(items, item.id) {
return;
}
}

9
src/tools/clippy/clippy_lints/src/utils/ast_utils.rs
View File

@ -241,9 +241,12 @@ pub fn eq_item_kind(l: &ItemKind, r: &ItemKind) -> bool {
&& eq_generics(lg, rg)
&& both(lb, rb, |l, r| eq_block(l, r))
}
(Mod(l), Mod(r)) => {
l.inline == r.inline && over(&l.items, &r.items, |l, r| eq_item(l, r, eq_item_kind))
}
(Mod(lu, lmk), Mod(ru, rmk)) => lu == ru && match (lmk, rmk) {
(ModKind::Loaded(litems, linline, _), ModKind::Loaded(ritems, rinline, _)) =>
linline == rinline && over(litems, ritems, |l, r| eq_item(l, r, eq_item_kind)),
(ModKind::Unloaded, ModKind::Unloaded) => true,
_ => false,
},
(ForeignMod(l), ForeignMod(r)) => {
both(&l.abi, &r.abi, |l, r| eq_str_lit(l, r))
&& over(&l.items, &r.items, |l, r| eq_item(l, r, eq_foreign_item_kind))