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syntax: revert ast::AsyncArgument and associated changes.

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Here follows the main reverts applied in order to make this commit:

Revert "Rollup merge of #60676 - davidtwco:issue-60674, r=cramertj"

This reverts commit 45b09453db, reversing
changes made to f6df1f6c30.

Revert "Rollup merge of #60437 - davidtwco:issue-60236, r=nikomatsakis"

This reverts commit 16939a50ea, reversing
changes made to 12bf981552.

Revert "Rollup merge of #59823 - davidtwco:issue-54716, r=cramertj"

This reverts commit 62d1574876, reversing
changes made to 4eff8526a7.
This commit is contained in:
Eduard-Mihai Burtescu 2019-05-29 04:10:49 +03:00 • committed by David Wood
parent c57ed9d947
commit d0c78dd7aa
No known key found for this signature in database
GPG key ID: 01760B4F9F53F154
15 changed files with 108 additions and 520 deletions
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187
src/librustc/hir/lowering.rs
View file

@ -465,32 +465,6 @@ impl<'a> LoweringContext<'a> {
visit::walk_pat(self, p) visit::walk_pat(self, p)
} }
fn visit_fn(&mut self, fk: visit::FnKind<'lcx>, fd: &'lcx FnDecl, s: Span, _: NodeId) {
if fk.header().map(|h| h.asyncness.node.is_async()).unwrap_or(false) {
// Don't visit the original pattern for async functions as it will be
// replaced.
for arg in &fd.inputs {
if let ArgSource::AsyncFn(pat) = &arg.source { self.visit_pat(pat); }
self.visit_ty(&arg.ty)
}
self.visit_fn_ret_ty(&fd.output);
match fk {
visit::FnKind::ItemFn(_, decl, _, body) => {
self.visit_fn_header(decl);
self.visit_block(body)
},
visit::FnKind::Method(_, sig, _, body) => {
self.visit_fn_header(&sig.header);
self.visit_block(body)
},
visit::FnKind::Closure(body) => self.visit_expr(body),
}
} else {
visit::walk_fn(self, fk, fd, s)
}
}
fn visit_item(&mut self, item: &'lcx Item) { fn visit_item(&mut self, item: &'lcx Item) {
let hir_id = self.lctx.allocate_hir_id_counter(item.id); let hir_id = self.lctx.allocate_hir_id_counter(item.id);
@ -2266,17 +2240,10 @@ impl<'a> LoweringContext<'a> {
init: l.init.as_ref().map(|e| P(self.lower_expr(e))), init: l.init.as_ref().map(|e| P(self.lower_expr(e))),
span: l.span, span: l.span,
attrs: l.attrs.clone(), attrs: l.attrs.clone(),
source: self.lower_local_source(l.source), source: hir::LocalSource::Normal,
}, ids) }, ids)
} }
fn lower_local_source(&mut self, ls: LocalSource) -> hir::LocalSource {
match ls {
LocalSource::Normal => hir::LocalSource::Normal,
LocalSource::AsyncFn => hir::LocalSource::AsyncFn,
}
}
fn lower_mutability(&mut self, m: Mutability) -> hir::Mutability { fn lower_mutability(&mut self, m: Mutability) -> hir::Mutability {
match m { match m {
Mutability::Mutable => hir::MutMutable, Mutability::Mutable => hir::MutMutable,
@ -2292,14 +2259,7 @@ impl<'a> LoweringContext<'a> {
hir::Arg { hir::Arg {
hir_id: self.lower_node_id(arg.id), hir_id: self.lower_node_id(arg.id),
pat: self.lower_pat(&arg.pat), pat: self.lower_pat(&arg.pat),
source: self.lower_arg_source(&arg.source), source: hir::ArgSource::Normal,
}
}
fn lower_arg_source(&mut self, source: &ArgSource) -> hir::ArgSource {
match source {
ArgSource::Normal => hir::ArgSource::Normal,
ArgSource::AsyncFn(pat) => hir::ArgSource::AsyncFn(self.lower_pat(pat)),
} }
} }
@ -3028,44 +2988,13 @@ impl<'a> LoweringContext<'a> {
fn lower_async_body( fn lower_async_body(
&mut self, &mut self,
decl: &FnDecl, decl: &FnDecl,
asyncness: &IsAsync, asyncness: IsAsync,
body: &Block, body: &Block,
) -> hir::BodyId { ) -> hir::BodyId {
self.lower_body(Some(&decl), |this| { self.lower_body(Some(&decl), |this| {
if let IsAsync::Async { closure_id, ref arguments, .. } = asyncness { if let IsAsync::Async { closure_id, .. } = asyncness {
let mut body = body.clone();
// Async function arguments are lowered into the closure body so that they are
// captured and so that the drop order matches the equivalent non-async functions.
//
// async fn foo(<pattern>: <ty>, <pattern>: <ty>, <pattern>: <ty>) {
// async move {
// }
// }
//
// // ...becomes...
// fn foo(__arg0: <ty>, __arg1: <ty>, __arg2: <ty>) {
// async move {
// let __arg2 = __arg2;
// let <pattern> = __arg2;
// let __arg1 = __arg1;
// let <pattern> = __arg1;
// let __arg0 = __arg0;
// let <pattern> = __arg0;
// }
// }
//
// If `<pattern>` is a simple ident, then it is lowered to a single
// `let <pattern> = <pattern>;` statement as an optimization.
for a in arguments.iter().rev() {
if let Some(pat_stmt) = a.pat_stmt.clone() {
body.stmts.insert(0, pat_stmt);
}
body.stmts.insert(0, a.move_stmt.clone());
}
let async_expr = this.make_async_expr( let async_expr = this.make_async_expr(
CaptureBy::Value, *closure_id, None, body.span, CaptureBy::Value, closure_id, None, body.span,
|this| { |this| {
let body = this.lower_block(&body, false); let body = this.lower_block(&body, false);
this.expr_block(body, ThinVec::new()) this.expr_block(body, ThinVec::new())
@ -3126,47 +3055,26 @@ impl<'a> LoweringContext<'a> {
value value
) )
} }
ItemKind::Fn(ref decl, ref header, ref generics, ref body) => { ItemKind::Fn(ref decl, header, ref generics, ref body) => {
let fn_def_id = self.resolver.definitions().local_def_id(id); let fn_def_id = self.resolver.definitions().local_def_id(id);
self.with_new_scopes(|this| { self.with_new_scopes(|this| {
// Note: we don't need to change the return type from `T` to
// `impl Future<Output = T>` here because lower_body
// only cares about the input argument patterns in the function
// declaration (decl), not the return types.
let body_id = this.lower_async_body(decl, header.asyncness.node, body);
let (generics, fn_decl) = this.add_in_band_defs(
generics,
fn_def_id,
AnonymousLifetimeMode::PassThrough,
|this, idty| this.lower_fn_decl(
decl,
Some((fn_def_id, idty)),
true,
header.asyncness.node.opt_return_id()
),
);
this.current_item = Some(ident.span); this.current_item = Some(ident.span);
let mut lower_fn = |decl: &FnDecl| {
// Note: we don't need to change the return type from `T` to
// `impl Future<Output = T>` here because lower_body
// only cares about the input argument patterns in the function
// declaration (decl), not the return types.
let body_id = this.lower_async_body(&decl, &header.asyncness.node, body);
let (generics, fn_decl) = this.add_in_band_defs(
generics,
fn_def_id,
AnonymousLifetimeMode::PassThrough,
|this, idty| this.lower_fn_decl(
&decl,
Some((fn_def_id, idty)),
true,
header.asyncness.node.opt_return_id()
),
);
(body_id, generics, fn_decl)
};
let (body_id, generics, fn_decl) = if let IsAsync::Async {
arguments, ..
} = &header.asyncness.node {
let mut decl = decl.clone();
// Replace the arguments of this async function with the generated
// arguments that will be moved into the closure.
for (i, a) in arguments.clone().drain(..).enumerate() {
if let Some(arg) = a.arg {
decl.inputs[i] = arg;
}
}
lower_fn(&decl)
} else {
lower_fn(decl)
};
hir::ItemKind::Fn( hir::ItemKind::Fn(
fn_decl, fn_decl,
@ -3638,36 +3546,15 @@ impl<'a> LoweringContext<'a> {
) )
} }
ImplItemKind::Method(ref sig, ref body) => { ImplItemKind::Method(ref sig, ref body) => {
let mut lower_method = |sig: &MethodSig| { let body_id = self.lower_async_body(&sig.decl, sig.header.asyncness.node, body);
let body_id = self.lower_async_body( let impl_trait_return_allow = !self.is_in_trait_impl;
&sig.decl, &sig.header.asyncness.node, body let (generics, sig) = self.lower_method_sig(
); &i.generics,
let impl_trait_return_allow = !self.is_in_trait_impl; sig,
let (generics, sig) = self.lower_method_sig( impl_item_def_id,
&i.generics, impl_trait_return_allow,
sig, sig.header.asyncness.node.opt_return_id(),
impl_item_def_id, );
impl_trait_return_allow,
sig.header.asyncness.node.opt_return_id(),
);
(body_id, generics, sig)
};
let (body_id, generics, sig) = if let IsAsync::Async {
ref arguments, ..
} = sig.header.asyncness.node {
let mut sig = sig.clone();
// Replace the arguments of this async function with the generated
// arguments that will be moved into the closure.
for (i, a) in arguments.clone().drain(..).enumerate() {
if let Some(arg) = a.arg {
sig.decl.inputs[i] = arg;
}
}
lower_method(&sig)
} else {
lower_method(sig)
};
self.current_item = Some(i.span); self.current_item = Some(i.span);
(generics, hir::ImplItemKind::Method(sig, body_id)) (generics, hir::ImplItemKind::Method(sig, body_id))
@ -3860,7 +3747,7 @@ impl<'a> LoweringContext<'a> {
impl_trait_return_allow: bool, impl_trait_return_allow: bool,
is_async: Option<NodeId>, is_async: Option<NodeId>,
) -> (hir::Generics, hir::MethodSig) { ) -> (hir::Generics, hir::MethodSig) {
let header = self.lower_fn_header(&sig.header); let header = self.lower_fn_header(sig.header);
let (generics, decl) = self.add_in_band_defs( let (generics, decl) = self.add_in_band_defs(
generics, generics,
fn_def_id, fn_def_id,
@ -3882,10 +3769,10 @@ impl<'a> LoweringContext<'a> {
} }
} }
fn lower_fn_header(&mut self, h: &FnHeader) -> hir::FnHeader { fn lower_fn_header(&mut self, h: FnHeader) -> hir::FnHeader {
hir::FnHeader { hir::FnHeader {
unsafety: self.lower_unsafety(h.unsafety), unsafety: self.lower_unsafety(h.unsafety),
asyncness: self.lower_asyncness(&h.asyncness.node), asyncness: self.lower_asyncness(h.asyncness.node),
constness: self.lower_constness(h.constness), constness: self.lower_constness(h.constness),
abi: h.abi, abi: h.abi,
} }
@ -3905,7 +3792,7 @@ impl<'a> LoweringContext<'a> {
} }
} }
fn lower_asyncness(&mut self, a: &IsAsync) -> hir::IsAsync { fn lower_asyncness(&mut self, a: IsAsync) -> hir::IsAsync {
match a { match a {
IsAsync::Async { .. } => hir::IsAsync::Async, IsAsync::Async { .. } => hir::IsAsync::Async,
IsAsync::NotAsync => hir::IsAsync::NotAsync, IsAsync::NotAsync => hir::IsAsync::NotAsync,
@ -4222,7 +4109,7 @@ impl<'a> LoweringContext<'a> {
} }
ExprKind::Await(_origin, ref expr) => self.lower_await(e.span, expr), ExprKind::Await(_origin, ref expr) => self.lower_await(e.span, expr),
ExprKind::Closure( ExprKind::Closure(
capture_clause, ref asyncness, movability, ref decl, ref body, fn_decl_span capture_clause, asyncness, movability, ref decl, ref body, fn_decl_span
) => { ) => {
if let IsAsync::Async { closure_id, .. } = asyncness { if let IsAsync::Async { closure_id, .. } = asyncness {
let outer_decl = FnDecl { let outer_decl = FnDecl {
@ -4260,7 +4147,7 @@ impl<'a> LoweringContext<'a> {
Some(&**ty) Some(&**ty)
} else { None }; } else { None };
let async_body = this.make_async_expr( let async_body = this.make_async_expr(
capture_clause, *closure_id, async_ret_ty, body.span, capture_clause, closure_id, async_ret_ty, body.span,
|this| { |this| {
this.with_new_scopes(|this| this.lower_expr(body)) this.with_new_scopes(|this| this.lower_expr(body))
}); });

41
src/librustc/hir/map/def_collector.rs
View file

@ -64,17 +64,16 @@ impl<'a> DefCollector<'a> {
id: NodeId, id: NodeId,
name: Name, name: Name,
span: Span, span: Span,
header: &'a FnHeader, header: &FnHeader,
generics: &'a Generics, generics: &'a Generics,
decl: &'a FnDecl, decl: &'a FnDecl,
body: &'a Block, body: &'a Block,
) { ) {
let (closure_id, return_impl_trait_id, arguments) = match &header.asyncness.node { let (closure_id, return_impl_trait_id) = match header.asyncness.node {
IsAsync::Async { IsAsync::Async {
closure_id, closure_id,
return_impl_trait_id, return_impl_trait_id,
arguments, } => (closure_id, return_impl_trait_id),
} => (closure_id, return_impl_trait_id, arguments),
_ => unreachable!(), _ => unreachable!(),
}; };
@ -83,38 +82,16 @@ impl<'a> DefCollector<'a> {
let fn_def_data = DefPathData::ValueNs(name.as_interned_str()); let fn_def_data = DefPathData::ValueNs(name.as_interned_str());
let fn_def = self.create_def(id, fn_def_data, span); let fn_def = self.create_def(id, fn_def_data, span);
return self.with_parent(fn_def, |this| { return self.with_parent(fn_def, |this| {
this.create_def(*return_impl_trait_id, DefPathData::ImplTrait, span); this.create_def(return_impl_trait_id, DefPathData::ImplTrait, span);
visit::walk_generics(this, generics); visit::walk_generics(this, generics);
visit::walk_fn_decl(this, decl);
// Walk the generated arguments for the `async fn`.
for (i, a) in arguments.iter().enumerate() {
use visit::Visitor;
if let Some(arg) = &a.arg {
this.visit_ty(&arg.ty);
} else {
this.visit_ty(&decl.inputs[i].ty);
}
}
// We do not invoke `walk_fn_decl` as this will walk the arguments that are being
// replaced.
visit::walk_fn_ret_ty(this, &decl.output);
let closure_def = this.create_def( let closure_def = this.create_def(
*closure_id, DefPathData::ClosureExpr, span, closure_id, DefPathData::ClosureExpr, span,
); );
this.with_parent(closure_def, |this| { this.with_parent(closure_def, |this| {
use visit::Visitor; visit::walk_block(this, body);
// Walk each of the generated statements before the regular block body.
for a in arguments {
this.visit_stmt(&a.move_stmt);
if let Some(pat_stmt) = &a.pat_stmt {
this.visit_stmt(&pat_stmt);
}
}
visit::walk_block(this, &body);
}) })
}) })
} }
@ -302,7 +279,7 @@ impl<'a> visit::Visitor<'a> for DefCollector<'a> {
match expr.node { match expr.node {
ExprKind::Mac(..) => return self.visit_macro_invoc(expr.id), ExprKind::Mac(..) => return self.visit_macro_invoc(expr.id),
ExprKind::Closure(_, ref asyncness, ..) => { ExprKind::Closure(_, asyncness, ..) => {
let closure_def = self.create_def(expr.id, let closure_def = self.create_def(expr.id,
DefPathData::ClosureExpr, DefPathData::ClosureExpr,
expr.span); expr.span);
@ -311,7 +288,7 @@ impl<'a> visit::Visitor<'a> for DefCollector<'a> {
// Async closures desugar to closures inside of closures, so // Async closures desugar to closures inside of closures, so
// we must create two defs. // we must create two defs.
if let IsAsync::Async { closure_id, .. } = asyncness { if let IsAsync::Async { closure_id, .. } = asyncness {
let async_def = self.create_def(*closure_id, let async_def = self.create_def(closure_id,
DefPathData::ClosureExpr, DefPathData::ClosureExpr,
expr.span); expr.span);
self.parent_def = Some(async_def); self.parent_def = Some(async_def);

24
src/librustc/lint/context.rs
View file

@ -1335,30 +1335,6 @@ impl<'a, T: EarlyLintPass> ast_visit::Visitor<'a> for EarlyContextAndPass<'a, T>
run_early_pass!(self, check_mac, mac); run_early_pass!(self, check_mac, mac);
} }
fn visit_fn_header(&mut self, header: &'a ast::FnHeader) {
// Unlike in HIR lowering and name resolution, the `AsyncArgument` statements are not added
// to the function body and the arguments do not replace those in the declaration. They are
// still visited manually here so that buffered lints can be emitted.
if let ast::IsAsync::Async { ref arguments, .. } = header.asyncness.node {
for a in arguments {
// Visit the argument..
if let Some(arg) = &a.arg {
self.visit_pat(&arg.pat);
if let ast::ArgSource::AsyncFn(pat) = &arg.source {
self.visit_pat(pat);
}
self.visit_ty(&arg.ty);
}
// ..and the statement.
self.visit_stmt(&a.move_stmt);
if let Some(pat_stmt) = &a.pat_stmt {
self.visit_stmt(&pat_stmt);
}
}
}
}
} }
struct LateLintPassObjects<'a> { struct LateLintPassObjects<'a> {

6
src/librustc_passes/ast_validation.rs
View file

@ -222,7 +222,7 @@ impl<'a> AstValidator<'a> {
} }
} }
fn check_trait_fn_not_async(&self, span: Span, asyncness: &IsAsync) { fn check_trait_fn_not_async(&self, span: Span, asyncness: IsAsync) {
if asyncness.is_async() { if asyncness.is_async() {
struct_span_err!(self.session, span, E0706, struct_span_err!(self.session, span, E0706,
"trait fns cannot be declared `async`").emit() "trait fns cannot be declared `async`").emit()
@ -561,7 +561,7 @@ impl<'a> Visitor<'a> for AstValidator<'a> {
self.invalid_visibility(&impl_item.vis, None); self.invalid_visibility(&impl_item.vis, None);
if let ImplItemKind::Method(ref sig, _) = impl_item.node { if let ImplItemKind::Method(ref sig, _) = impl_item.node {
self.check_trait_fn_not_const(sig.header.constness); self.check_trait_fn_not_const(sig.header.constness);
self.check_trait_fn_not_async(impl_item.span, &sig.header.asyncness.node); self.check_trait_fn_not_async(impl_item.span, sig.header.asyncness.node);
} }
} }
} }
@ -633,7 +633,7 @@ impl<'a> Visitor<'a> for AstValidator<'a> {
self.no_questions_in_bounds(bounds, "supertraits", true); self.no_questions_in_bounds(bounds, "supertraits", true);
for trait_item in trait_items { for trait_item in trait_items {
if let TraitItemKind::Method(ref sig, ref block) = trait_item.node { if let TraitItemKind::Method(ref sig, ref block) = trait_item.node {
self.check_trait_fn_not_async(trait_item.span, &sig.header.asyncness.node); self.check_trait_fn_not_async(trait_item.span, sig.header.asyncness.node);
self.check_trait_fn_not_const(sig.header.constness); self.check_trait_fn_not_const(sig.header.constness);
if block.is_none() { if block.is_none() {
self.check_decl_no_pat(&sig.decl, |span, mut_ident| { self.check_decl_no_pat(&sig.decl, |span, mut_ident| {

72
src/librustc_resolve/lib.rs
View file

@ -855,15 +855,10 @@ impl<'a, 'tcx> Visitor<'tcx> for Resolver<'a> {
_: NodeId) _: NodeId)
{ {
debug!("(resolving function) entering function"); debug!("(resolving function) entering function");
let (rib_kind, asyncness) = match function_kind { let rib_kind = match function_kind {
FnKind::ItemFn(_, ref header, ..) => FnKind::ItemFn(..) => FnItemRibKind,
(FnItemRibKind, &header.asyncness.node), FnKind::Method(..) => AssocItemRibKind,
FnKind::Method(_, ref sig, _, _) => FnKind::Closure(_) => NormalRibKind,
(AssocItemRibKind, &sig.header.asyncness.node),
FnKind::Closure(_) =>
// Async closures aren't resolved through `visit_fn`-- they're
// processed separately
(NormalRibKind, &IsAsync::NotAsync),
}; };
// Create a value rib for the function. // Create a value rib for the function.
@ -874,45 +869,20 @@ impl<'a, 'tcx> Visitor<'tcx> for Resolver<'a> {
// Add each argument to the rib. // Add each argument to the rib.
let mut bindings_list = FxHashMap::default(); let mut bindings_list = FxHashMap::default();
let mut add_argument = |argument: &ast::Arg| { for argument in &declaration.inputs {
self.resolve_pattern(&argument.pat, PatternSource::FnParam, &mut bindings_list); self.resolve_pattern(&argument.pat, PatternSource::FnParam, &mut bindings_list);
self.visit_ty(&argument.ty); self.visit_ty(&argument.ty);
debug!("(resolving function) recorded argument"); debug!("(resolving function) recorded argument");
};
// Walk the generated async arguments if this is an `async fn`, otherwise walk the
// normal arguments.
if let IsAsync::Async { ref arguments, .. } = asyncness {
for (i, a) in arguments.iter().enumerate() {
if let Some(arg) = &a.arg {
add_argument(&arg);
} else {
add_argument(&declaration.inputs[i]);
}
}
} else {
for a in &declaration.inputs { add_argument(a); }
} }
visit::walk_fn_ret_ty(self, &declaration.output); visit::walk_fn_ret_ty(self, &declaration.output);
// Resolve the function body, potentially inside the body of an async closure // Resolve the function body, potentially inside the body of an async closure
match function_kind { match function_kind {
FnKind::ItemFn(.., body) | FnKind::Method(.., body) => { FnKind::ItemFn(.., body) |
if let IsAsync::Async { ref arguments, .. } = asyncness { FnKind::Method(.., body) => {
let mut body = body.clone(); self.visit_block(body);
// Insert the generated statements into the body before attempting to
// resolve names.
for a in arguments.iter().rev() {
if let Some(pat_stmt) = a.pat_stmt.clone() {
body.stmts.insert(0, pat_stmt);
}
body.stmts.insert(0, a.move_stmt.clone());
}
self.visit_block(&body);
} else {
self.visit_block(body);
}
} }
FnKind::Closure(body) => { FnKind::Closure(body) => {
self.visit_expr(body); self.visit_expr(body);
@ -4178,7 +4148,7 @@ impl<'a> Resolver<'a> {
let add_module_candidates = |module: Module<'_>, names: &mut Vec<TypoSuggestion>| { let add_module_candidates = |module: Module<'_>, names: &mut Vec<TypoSuggestion>| {
for (&(ident, _), resolution) in module.resolutions.borrow().iter() { for (&(ident, _), resolution) in module.resolutions.borrow().iter() {
if let Some(binding) = resolution.borrow().binding { if let Some(binding) = resolution.borrow().binding {
if !ident.is_gensymed() && filter_fn(binding.res()) { if filter_fn(binding.res()) {
names.push(TypoSuggestion { names.push(TypoSuggestion {
candidate: ident.name, candidate: ident.name,
article: binding.res().article(), article: binding.res().article(),
@ -4196,7 +4166,7 @@ impl<'a> Resolver<'a> {
for rib in self.ribs[ns].iter().rev() { for rib in self.ribs[ns].iter().rev() {
// Locals and type parameters // Locals and type parameters
for (ident, &res) in &rib.bindings { for (ident, &res) in &rib.bindings {
if !ident.is_gensymed() && filter_fn(res) { if filter_fn(res) {
names.push(TypoSuggestion { names.push(TypoSuggestion {
candidate: ident.name, candidate: ident.name,
article: res.article(), article: res.article(),
@ -4226,7 +4196,7 @@ impl<'a> Resolver<'a> {
}, },
); );
if !ident.is_gensymed() && filter_fn(crate_mod) { if filter_fn(crate_mod) {
Some(TypoSuggestion { Some(TypoSuggestion {
candidate: ident.name, candidate: ident.name,
article: "a", article: "a",
@ -4249,15 +4219,13 @@ impl<'a> Resolver<'a> {
// Add primitive types to the mix // Add primitive types to the mix
if filter_fn(Res::PrimTy(Bool)) { if filter_fn(Res::PrimTy(Bool)) {
names.extend( names.extend(
self.primitive_type_table.primitive_types self.primitive_type_table.primitive_types.iter().map(|(name, _)| {
.iter() TypoSuggestion {
.map(|(name, _)| { candidate: *name,
TypoSuggestion { article: "a",
candidate: *name, kind: "primitive type",
article: "a", }
kind: "primitive type", })
}
})
) )
} }
} else { } else {

2
src/librustc_save_analysis/sig.rs
View file

@ -374,7 +374,7 @@ impl Sig for ast::Item {
Ok(extend_sig(ty, text, defs, vec![])) Ok(extend_sig(ty, text, defs, vec![]))
} }
ast::ItemKind::Fn(ref decl, ref header, ref generics, _) => { ast::ItemKind::Fn(ref decl, header, ref generics, _) => {
let mut text = String::new(); let mut text = String::new();
if header.constness.node == ast::Constness::Const { if header.constness.node == ast::Constness::Const {
text.push_str("const "); text.push_str("const ");

55
src/libsyntax/ast.rs
View file

@ -879,17 +879,6 @@ pub struct Local {
pub id: NodeId, pub id: NodeId,
pub span: Span, pub span: Span,
pub attrs: ThinVec<Attribute>, pub attrs: ThinVec<Attribute>,
/// Origin of this local variable.
pub source: LocalSource,
}
#[derive(Clone, Copy, RustcEncodable, RustcDecodable, Debug)]
pub enum LocalSource {
/// Local was parsed from source.
Normal,
/// Within `ast::IsAsync::Async`, a local is generated that will contain the moved arguments
/// of an `async fn`.
AsyncFn,
} }
/// An arm of a 'match'. /// An arm of a 'match'.
@ -1770,16 +1759,6 @@ pub struct Arg {
pub ty: P<Ty>, pub ty: P<Ty>,
pub pat: P<Pat>, pub pat: P<Pat>,
pub id: NodeId, pub id: NodeId,
pub source: ArgSource,
}
/// The source of an argument in a function header.
#[derive(Clone, RustcEncodable, RustcDecodable, Debug)]
pub enum ArgSource {
/// Argument as written by the user.
Normal,
/// Argument from `async fn` lowering, contains the original binding pattern.
AsyncFn(P<Pat>),
} }
/// Alternative representation for `Arg`s describing `self` parameter of methods. /// Alternative representation for `Arg`s describing `self` parameter of methods.
@ -1839,7 +1818,6 @@ impl Arg {
}), }),
ty, ty,
id: DUMMY_NODE_ID, id: DUMMY_NODE_ID,
source: ArgSource::Normal,
}; };
match eself.node { match eself.node {
SelfKind::Explicit(ty, mutbl) => arg(mutbl, ty), SelfKind::Explicit(ty, mutbl) => arg(mutbl, ty),
@ -1894,39 +1872,18 @@ pub enum Unsafety {
Normal, Normal,
} }
#[derive(Clone, RustcEncodable, RustcDecodable, Debug)] #[derive(Copy, Clone, RustcEncodable, RustcDecodable, Debug)]
pub struct AsyncArgument {
/// `__arg0`
pub ident: Ident,
/// `__arg0: <ty>` argument to replace existing function argument `<pat>: <ty>`. Only if
/// argument is not a simple binding.
pub arg: Option<Arg>,
/// `let __arg0 = __arg0;` statement to be inserted at the start of the block.
pub move_stmt: Stmt,
/// `let <pat> = __arg0;` statement to be inserted at the start of the block, after matching
/// move statement. Only if argument is not a simple binding.
pub pat_stmt: Option<Stmt>,
}
#[derive(Clone, RustcEncodable, RustcDecodable, Debug)]
pub enum IsAsync { pub enum IsAsync {
Async { Async {
closure_id: NodeId, closure_id: NodeId,
return_impl_trait_id: NodeId, return_impl_trait_id: NodeId,
/// This field stores the arguments and statements that are used in HIR lowering to
/// ensure that `async fn` arguments are dropped at the correct time.
///
/// The argument and statements here are generated at parse time as they are required in
/// both the hir lowering, def collection and name resolution and this stops them needing
/// to be created in each place.
arguments: Vec<AsyncArgument>,
}, },
NotAsync, NotAsync,
} }
impl IsAsync { impl IsAsync {
pub fn is_async(&self) -> bool { pub fn is_async(self) -> bool {
if let IsAsync::Async { .. } = *self { if let IsAsync::Async { .. } = self {
true true
} else { } else {
false false
@ -1934,12 +1891,12 @@ impl IsAsync {
} }
/// In ths case this is an `async` return, the `NodeId` for the generated `impl Trait` item. /// In ths case this is an `async` return, the `NodeId` for the generated `impl Trait` item.
pub fn opt_return_id(&self) -> Option<NodeId> { pub fn opt_return_id(self) -> Option<NodeId> {
match self { match self {
IsAsync::Async { IsAsync::Async {
return_impl_trait_id, return_impl_trait_id,
.. ..
} => Some(*return_impl_trait_id), } => Some(return_impl_trait_id),
IsAsync::NotAsync => None, IsAsync::NotAsync => None,
} }
} }
@ -2279,7 +2236,7 @@ impl Item {
/// ///
/// All the information between the visibility and the name of the function is /// All the information between the visibility and the name of the function is
/// included in this struct (e.g., `async unsafe fn` or `const extern "C" fn`). /// included in this struct (e.g., `async unsafe fn` or `const extern "C" fn`).
#[derive(Clone, RustcEncodable, RustcDecodable, Debug)] #[derive(Clone, Copy, RustcEncodable, RustcDecodable, Debug)]
pub struct FnHeader { pub struct FnHeader {
pub unsafety: Unsafety, pub unsafety: Unsafety,
pub asyncness: Spanned<IsAsync>, pub asyncness: Spanned<IsAsync>,

6
src/libsyntax/ext/build.rs
View file

@ -516,7 +516,6 @@ impl<'a> AstBuilder for ExtCtxt<'a> {
id: ast::DUMMY_NODE_ID, id: ast::DUMMY_NODE_ID,
span: sp, span: sp,
attrs: ThinVec::new(), attrs: ThinVec::new(),
source: ast::LocalSource::Normal,
}); });
ast::Stmt { ast::Stmt {
id: ast::DUMMY_NODE_ID, id: ast::DUMMY_NODE_ID,
@ -545,7 +544,6 @@ impl<'a> AstBuilder for ExtCtxt<'a> {
id: ast::DUMMY_NODE_ID, id: ast::DUMMY_NODE_ID,
span: sp, span: sp,
attrs: ThinVec::new(), attrs: ThinVec::new(),
source: ast::LocalSource::Normal,
}); });
ast::Stmt { ast::Stmt {
id: ast::DUMMY_NODE_ID, id: ast::DUMMY_NODE_ID,
@ -563,7 +561,6 @@ impl<'a> AstBuilder for ExtCtxt<'a> {
id: ast::DUMMY_NODE_ID, id: ast::DUMMY_NODE_ID,
span, span,
attrs: ThinVec::new(), attrs: ThinVec::new(),
source: ast::LocalSource::Normal,
}); });
ast::Stmt { ast::Stmt {
id: ast::DUMMY_NODE_ID, id: ast::DUMMY_NODE_ID,
@ -971,8 +968,7 @@ impl<'a> AstBuilder for ExtCtxt<'a> {
ast::Arg { ast::Arg {
ty, ty,
pat: arg_pat, pat: arg_pat,
id: ast::DUMMY_NODE_ID, id: ast::DUMMY_NODE_ID
source: ast::ArgSource::Normal,
} }
} }

23
src/libsyntax/ext/placeholders.rs
View file

@ -101,13 +101,6 @@ impl<'a, 'b> PlaceholderExpander<'a, 'b> {
fn remove(&mut self, id: ast::NodeId) -> AstFragment { fn remove(&mut self, id: ast::NodeId) -> AstFragment {
self.expanded_fragments.remove(&id).unwrap() self.expanded_fragments.remove(&id).unwrap()
} }
fn next_id(&mut self, id: &mut ast::NodeId) {
if self.monotonic {
assert_eq!(*id, ast::DUMMY_NODE_ID);
*id = self.cx.resolver.next_node_id()
}
}
} }
impl<'a, 'b> MutVisitor for PlaceholderExpander<'a, 'b> { impl<'a, 'b> MutVisitor for PlaceholderExpander<'a, 'b> {
@ -189,19 +182,9 @@ impl<'a, 'b> MutVisitor for PlaceholderExpander<'a, 'b> {
noop_visit_block(block, self); noop_visit_block(block, self);
for stmt in block.stmts.iter_mut() { for stmt in block.stmts.iter_mut() {
self.next_id(&mut stmt.id); if self.monotonic {
} assert_eq!(stmt.id, ast::DUMMY_NODE_ID);
} stmt.id = self.cx.resolver.next_node_id();
fn visit_asyncness(&mut self, a: &mut ast::IsAsync) {
noop_visit_asyncness(a, self);
if let ast::IsAsync::Async { ref mut arguments, .. } = a {
for argument in arguments.iter_mut() {
self.next_id(&mut argument.move_stmt.id);
if let Some(ref mut pat_stmt) = &mut argument.pat_stmt {
self.next_id(&mut pat_stmt.id);
}
} }
} }
} }

42
src/libsyntax/mut_visit.rs
View file

@ -207,10 +207,6 @@ pub trait MutVisitor: Sized {
noop_visit_local(l, self); noop_visit_local(l, self);
} }
fn visit_local_source(&mut self, l: &mut LocalSource) {
noop_visit_local_source(l, self);
}
fn visit_mac(&mut self, _mac: &mut Mac) { fn visit_mac(&mut self, _mac: &mut Mac) {
panic!("visit_mac disabled by default"); panic!("visit_mac disabled by default");
// N.B., see note about macros above. If you really want a visitor that // N.B., see note about macros above. If you really want a visitor that
@ -234,10 +230,6 @@ pub trait MutVisitor: Sized {
noop_visit_arg(a, self); noop_visit_arg(a, self);
} }
fn visit_arg_source(&mut self, a: &mut ArgSource) {
noop_visit_arg_source(a, self);
}
fn visit_generics(&mut self, generics: &mut Generics) { fn visit_generics(&mut self, generics: &mut Generics) {
noop_visit_generics(generics, self); noop_visit_generics(generics, self);
} }
@ -522,17 +514,13 @@ pub fn noop_visit_parenthesized_parameter_data<T: MutVisitor>(args: &mut Parenth
} }
pub fn noop_visit_local<T: MutVisitor>(local: &mut P<Local>, vis: &mut T) { pub fn noop_visit_local<T: MutVisitor>(local: &mut P<Local>, vis: &mut T) {
let Local { id, pat, ty, init, span, attrs, source } = local.deref_mut(); let Local { id, pat, ty, init, span, attrs } = local.deref_mut();
vis.visit_id(id); vis.visit_id(id);
vis.visit_pat(pat); vis.visit_pat(pat);
visit_opt(ty, |ty| vis.visit_ty(ty)); visit_opt(ty, |ty| vis.visit_ty(ty));
visit_opt(init, |init| vis.visit_expr(init)); visit_opt(init, |init| vis.visit_expr(init));
vis.visit_span(span); vis.visit_span(span);
visit_thin_attrs(attrs, vis); visit_thin_attrs(attrs, vis);
vis.visit_local_source(source);
}
pub fn noop_visit_local_source<T: MutVisitor>(_local_source: &mut LocalSource, _vis: &mut T) {
} }
pub fn noop_visit_attribute<T: MutVisitor>(attr: &mut Attribute, vis: &mut T) { pub fn noop_visit_attribute<T: MutVisitor>(attr: &mut Attribute, vis: &mut T) {
@ -571,18 +559,10 @@ pub fn noop_visit_meta_item<T: MutVisitor>(mi: &mut MetaItem, vis: &mut T) {
vis.visit_span(span); vis.visit_span(span);
} }
pub fn noop_visit_arg<T: MutVisitor>(Arg { id, pat, ty, source }: &mut Arg, vis: &mut T) { pub fn noop_visit_arg<T: MutVisitor>(Arg { id, pat, ty }: &mut Arg, vis: &mut T) {
vis.visit_id(id); vis.visit_id(id);
vis.visit_pat(pat); vis.visit_pat(pat);
vis.visit_ty(ty); vis.visit_ty(ty);
vis.visit_arg_source(source);
}
pub fn noop_visit_arg_source<T: MutVisitor>(source: &mut ArgSource, vis: &mut T) {
match source {
ArgSource::Normal => {},
ArgSource::AsyncFn(pat) => vis.visit_pat(pat),
}
} }
pub fn noop_visit_tt<T: MutVisitor>(tt: &mut TokenTree, vis: &mut T) { pub fn noop_visit_tt<T: MutVisitor>(tt: &mut TokenTree, vis: &mut T) {
@ -690,25 +670,9 @@ pub fn noop_visit_interpolated<T: MutVisitor>(nt: &mut token::Nonterminal, vis:
pub fn noop_visit_asyncness<T: MutVisitor>(asyncness: &mut IsAsync, vis: &mut T) { pub fn noop_visit_asyncness<T: MutVisitor>(asyncness: &mut IsAsync, vis: &mut T) {
match asyncness { match asyncness {
IsAsync::Async { closure_id, return_impl_trait_id, ref mut arguments } => { IsAsync::Async { closure_id, return_impl_trait_id } => {
vis.visit_id(closure_id); vis.visit_id(closure_id);
vis.visit_id(return_impl_trait_id); vis.visit_id(return_impl_trait_id);
for AsyncArgument { ident, arg, pat_stmt, move_stmt } in arguments.iter_mut() {
vis.visit_ident(ident);
if let Some(arg) = arg {
vis.visit_arg(arg);
}
visit_clobber(move_stmt, |stmt| {
vis.flat_map_stmt(stmt)
.expect_one("expected visitor to produce exactly one item")
});
visit_opt(pat_stmt, |stmt| {
visit_clobber(stmt, |stmt| {
vis.flat_map_stmt(stmt)
.expect_one("expected visitor to produce exactly one item")
})
});
}
} }
IsAsync::NotAsync => {} IsAsync::NotAsync => {}
} }

2
src/libsyntax/parse/diagnostics.rs
View file

@ -27,7 +27,7 @@ crate fn dummy_arg(ident: Ident) -> Arg {
span: ident.span, span: ident.span,
id: ast::DUMMY_NODE_ID id: ast::DUMMY_NODE_ID
}; };
Arg { ty: P(ty), pat: pat, id: ast::DUMMY_NODE_ID, source: ast::ArgSource::Normal } Arg { ty: P(ty), pat: pat, id: ast::DUMMY_NODE_ID }
} }
pub enum Error { pub enum Error {

141
src/libsyntax/parse/parser.rs
View file

@ -1,9 +1,9 @@
// ignore-tidy-filelength // ignore-tidy-filelength
use crate::ast::{AngleBracketedArgs, AsyncArgument, ParenthesizedArgs, AttrStyle, BareFnTy}; use crate::ast::{AngleBracketedArgs, ParenthesizedArgs, AttrStyle, BareFnTy};
use crate::ast::{GenericBound, TraitBoundModifier}; use crate::ast::{GenericBound, TraitBoundModifier};
use crate::ast::Unsafety; use crate::ast::Unsafety;
use crate::ast::{Mod, AnonConst, Arg, ArgSource, Arm, Guard, Attribute, BindingMode, TraitItemKind}; use crate::ast::{Mod, AnonConst, Arg, Arm, Guard, Attribute, BindingMode, TraitItemKind};
use crate::ast::Block; use crate::ast::Block;
use crate::ast::{BlockCheckMode, CaptureBy, Movability}; use crate::ast::{BlockCheckMode, CaptureBy, Movability};
use crate::ast::{Constness, Crate}; use crate::ast::{Constness, Crate};
@ -16,7 +16,7 @@ use crate::ast::{GenericParam, GenericParamKind};
use crate::ast::GenericArg; use crate::ast::GenericArg;
use crate::ast::{Ident, ImplItem, IsAsync, IsAuto, Item, ItemKind}; use crate::ast::{Ident, ImplItem, IsAsync, IsAuto, Item, ItemKind};
use crate::ast::{Label, Lifetime}; use crate::ast::{Label, Lifetime};
use crate::ast::{Local, LocalSource}; use crate::ast::Local;
use crate::ast::MacStmtStyle; use crate::ast::MacStmtStyle;
use crate::ast::{Mac, Mac_, MacDelimiter}; use crate::ast::{Mac, Mac_, MacDelimiter};
use crate::ast::{MutTy, Mutability}; use crate::ast::{MutTy, Mutability};
@ -51,7 +51,7 @@ use crate::parse::diagnostics::{Error, dummy_arg};
use errors::{Applicability, DiagnosticBuilder, DiagnosticId, FatalError}; use errors::{Applicability, DiagnosticBuilder, DiagnosticId, FatalError};
use rustc_target::spec::abi::{self, Abi}; use rustc_target::spec::abi::{self, Abi};
use syntax_pos::{Span, BytePos, DUMMY_SP, FileName, hygiene::CompilerDesugaringKind}; use syntax_pos::{Span, BytePos, DUMMY_SP, FileName};
use log::debug; use log::debug;
use std::borrow::Cow; use std::borrow::Cow;
@ -1126,7 +1126,6 @@ impl<'a> Parser<'a> {
IsAsync::Async { IsAsync::Async {
closure_id: ast::DUMMY_NODE_ID, closure_id: ast::DUMMY_NODE_ID,
return_impl_trait_id: ast::DUMMY_NODE_ID, return_impl_trait_id: ast::DUMMY_NODE_ID,
arguments: Vec::new(),
} }
} else { } else {
IsAsync::NotAsync IsAsync::NotAsync
@ -1185,12 +1184,12 @@ impl<'a> Parser<'a> {
// trait item macro. // trait item macro.
(Ident::invalid(), ast::TraitItemKind::Macro(mac), ast::Generics::default()) (Ident::invalid(), ast::TraitItemKind::Macro(mac), ast::Generics::default())
} else { } else {
let (constness, unsafety, mut asyncness, abi) = self.parse_fn_front_matter()?; let (constness, unsafety, asyncness, abi) = self.parse_fn_front_matter()?;
let ident = self.parse_ident()?; let ident = self.parse_ident()?;
let mut generics = self.parse_generics()?; let mut generics = self.parse_generics()?;
let mut decl = self.parse_fn_decl_with_self(|p: &mut Parser<'a>| { let decl = self.parse_fn_decl_with_self(|p: &mut Parser<'a>| {
// This is somewhat dubious; We don't want to allow // This is somewhat dubious; We don't want to allow
// argument names to be left off if there is a // argument names to be left off if there is a
// definition... // definition...
@ -1199,7 +1198,6 @@ impl<'a> Parser<'a> {
p.parse_arg_general(p.span.rust_2018(), true, false) p.parse_arg_general(p.span.rust_2018(), true, false)
})?; })?;
generics.where_clause = self.parse_where_clause()?; generics.where_clause = self.parse_where_clause()?;
self.construct_async_arguments(&mut asyncness, &mut decl);
let sig = ast::MethodSig { let sig = ast::MethodSig {
header: FnHeader { header: FnHeader {
@ -1563,7 +1561,7 @@ impl<'a> Parser<'a> {
} }
}; };
Ok(Arg { ty, pat, id: ast::DUMMY_NODE_ID, source: ast::ArgSource::Normal }) Ok(Arg { ty, pat, id: ast::DUMMY_NODE_ID })
} }
/// Parses an argument in a lambda header (e.g., `|arg, arg|`). /// Parses an argument in a lambda header (e.g., `|arg, arg|`).
@ -1581,8 +1579,7 @@ impl<'a> Parser<'a> {
Ok(Arg { Ok(Arg {
ty: t, ty: t,
pat, pat,
id: ast::DUMMY_NODE_ID, id: ast::DUMMY_NODE_ID
source: ast::ArgSource::Normal,
}) })
} }
@ -4213,7 +4210,6 @@ impl<'a> Parser<'a> {
id: ast::DUMMY_NODE_ID, id: ast::DUMMY_NODE_ID,
span: lo.to(hi), span: lo.to(hi),
attrs, attrs,
source: LocalSource::Normal,
})) }))
} }
@ -5660,16 +5656,15 @@ impl<'a> Parser<'a> {
/// Parses an item-position function declaration. /// Parses an item-position function declaration.
fn parse_item_fn(&mut self, fn parse_item_fn(&mut self,
unsafety: Unsafety, unsafety: Unsafety,
mut asyncness: Spanned<IsAsync>, asyncness: Spanned<IsAsync>,
constness: Spanned<Constness>, constness: Spanned<Constness>,
abi: Abi) abi: Abi)
-> PResult<'a, ItemInfo> { -> PResult<'a, ItemInfo> {
let (ident, mut generics) = self.parse_fn_header()?; let (ident, mut generics) = self.parse_fn_header()?;
let allow_c_variadic = abi == Abi::C && unsafety == Unsafety::Unsafe; let allow_c_variadic = abi == Abi::C && unsafety == Unsafety::Unsafe;
let mut decl = self.parse_fn_decl(allow_c_variadic)?; let decl = self.parse_fn_decl(allow_c_variadic)?;
generics.where_clause = self.parse_where_clause()?; generics.where_clause = self.parse_where_clause()?;
let (inner_attrs, body) = self.parse_inner_attrs_and_block()?; let (inner_attrs, body) = self.parse_inner_attrs_and_block()?;
self.construct_async_arguments(&mut asyncness, &mut decl);
let header = FnHeader { unsafety, asyncness, constness, abi }; let header = FnHeader { unsafety, asyncness, constness, abi };
Ok((ident, ItemKind::Fn(decl, header, generics, body), Some(inner_attrs))) Ok((ident, ItemKind::Fn(decl, header, generics, body), Some(inner_attrs)))
} }
@ -5849,14 +5844,13 @@ impl<'a> Parser<'a> {
Ok((Ident::invalid(), vec![], ast::Generics::default(), Ok((Ident::invalid(), vec![], ast::Generics::default(),
ast::ImplItemKind::Macro(mac))) ast::ImplItemKind::Macro(mac)))
} else { } else {
let (constness, unsafety, mut asyncness, abi) = self.parse_fn_front_matter()?; let (constness, unsafety, asyncness, abi) = self.parse_fn_front_matter()?;
let ident = self.parse_ident()?; let ident = self.parse_ident()?;
let mut generics = self.parse_generics()?; let mut generics = self.parse_generics()?;
let mut decl = self.parse_fn_decl_with_self(|p| { let decl = self.parse_fn_decl_with_self(|p| {
p.parse_arg_general(true, true, false) p.parse_arg_general(true, true, false)
})?; })?;
generics.where_clause = self.parse_where_clause()?; generics.where_clause = self.parse_where_clause()?;
self.construct_async_arguments(&mut asyncness, &mut decl);
*at_end = true; *at_end = true;
let (inner_attrs, body) = self.parse_inner_attrs_and_block()?; let (inner_attrs, body) = self.parse_inner_attrs_and_block()?;
let header = ast::FnHeader { abi, unsafety, constness, asyncness }; let header = ast::FnHeader { abi, unsafety, constness, asyncness };
@ -7218,7 +7212,6 @@ impl<'a> Parser<'a> {
respan(async_span, IsAsync::Async { respan(async_span, IsAsync::Async {
closure_id: ast::DUMMY_NODE_ID, closure_id: ast::DUMMY_NODE_ID,
return_impl_trait_id: ast::DUMMY_NODE_ID, return_impl_trait_id: ast::DUMMY_NODE_ID,
arguments: Vec::new(),
}), }),
respan(fn_span, Constness::NotConst), respan(fn_span, Constness::NotConst),
Abi::Rust)?; Abi::Rust)?;
@ -7849,116 +7842,6 @@ impl<'a> Parser<'a> {
Applicability::MaybeIncorrect, Applicability::MaybeIncorrect,
).emit(); ).emit();
} }
/// When lowering a `async fn` to the HIR, we need to move all of the arguments of the function
/// into the generated closure so that they are dropped when the future is polled and not when
/// it is created.
///
/// The arguments of the function are replaced in HIR lowering with the arguments created by
/// this function and the statements created here are inserted at the top of the closure body.
fn construct_async_arguments(&mut self, asyncness: &mut Spanned<IsAsync>, decl: &mut FnDecl) {
// FIXME(davidtwco): This function should really live in the HIR lowering but because
// the types constructed here need to be used in parts of resolve so that the correct
// locals are considered upvars, it is currently easier for it to live here in the parser,
// where it can be constructed once.
if let IsAsync::Async { ref mut arguments, .. } = asyncness.node {
for (index, input) in decl.inputs.iter_mut().enumerate() {
let id = ast::DUMMY_NODE_ID;
let span = input.pat.span;
let desugared_span = self.sess.source_map()
.mark_span_with_reason(CompilerDesugaringKind::Async, span, None);
// Construct a name for our temporary argument.
let name = format!("__arg{}", index);
let ident = Ident::from_str(&name).gensym();
// Check if this is a ident pattern, if so, we can optimize and avoid adding a
// `let <pat> = __argN;` statement, instead just adding a `let <pat> = <pat>;`
// statement.
let (binding_mode, ident, is_simple_pattern) = match input.pat.node {
PatKind::Ident(binding_mode @ BindingMode::ByValue(_), ident, _) => {
// Simple patterns like this don't have a generated argument, but they are
// moved into the closure with a statement, so any `mut` bindings on the
// argument will be unused. This binding mode can't be removed, because
// this would affect the input to procedural macros, but they can have
// their span marked as being the result of a compiler desugaring so
// that they aren't linted against.
input.pat.span = desugared_span;
(binding_mode, ident, true)
}
_ => (BindingMode::ByValue(Mutability::Mutable), ident, false),
};
// Construct an argument representing `__argN: <ty>` to replace the argument of the
// async function if it isn't a simple pattern.
let arg = if is_simple_pattern {
None
} else {
Some(Arg {
ty: input.ty.clone(),
id,
pat: P(Pat {
id,
node: PatKind::Ident(
BindingMode::ByValue(Mutability::Immutable), ident, None,
),
span: desugared_span,
}),
source: ArgSource::AsyncFn(input.pat.clone()),
})
};
// Construct a `let __argN = __argN;` statement to insert at the top of the
// async closure. This makes sure that the argument is captured by the closure and
// that the drop order is correct.
let move_local = Local {
pat: P(Pat {
id,
node: PatKind::Ident(binding_mode, ident, None),
span: desugared_span,
}),
// We explicitly do not specify the type for this statement. When the user's
// argument type is `impl Trait` then this would require the
// `impl_trait_in_bindings` feature to also be present for that same type to
// be valid in this binding. At the time of writing (13 Mar 19),
// `impl_trait_in_bindings` is not stable.
ty: None,
init: Some(P(Expr {
id,
node: ExprKind::Path(None, ast::Path {
span,
segments: vec![PathSegment { ident, id, args: None }],
}),
span,
attrs: ThinVec::new(),
})),
id,
span,
attrs: ThinVec::new(),
source: LocalSource::AsyncFn,
};
// Construct a `let <pat> = __argN;` statement to insert at the top of the
// async closure if this isn't a simple pattern.
let pat_stmt = if is_simple_pattern {
None
} else {
Some(Stmt {
id,
node: StmtKind::Local(P(Local {
pat: input.pat.clone(),
..move_local.clone()
})),
span,
})
};
let move_stmt = Stmt { id, node: StmtKind::Local(P(move_local)), span };
arguments.push(AsyncArgument { ident, arg, pat_stmt, move_stmt });
}
}
}
} }
pub fn emit_unclosed_delims(unclosed_delims: &mut Vec<UnmatchedBrace>, handler: &errors::Handler) { pub fn emit_unclosed_delims(unclosed_delims: &mut Vec<UnmatchedBrace>, handler: &errors::Handler) {

23
src/libsyntax/print/pprust.rs
View file

@ -357,7 +357,7 @@ pub fn vis_to_string(v: &ast::Visibility) -> String {
} }
pub fn fun_to_string(decl: &ast::FnDecl, pub fn fun_to_string(decl: &ast::FnDecl,
header: &ast::FnHeader, header: ast::FnHeader,
name: ast::Ident, name: ast::Ident,
generics: &ast::Generics) generics: &ast::Generics)
-> String { -> String {
@ -1040,7 +1040,7 @@ impl<'a> State<'a> {
match item.node { match item.node {
ast::ForeignItemKind::Fn(ref decl, ref generics) => { ast::ForeignItemKind::Fn(ref decl, ref generics) => {
self.head("")?; self.head("")?;
self.print_fn(decl, &ast::FnHeader::default(), self.print_fn(decl, ast::FnHeader::default(),
Some(item.ident), Some(item.ident),
generics, &item.vis)?; generics, &item.vis)?;
self.end()?; // end head-ibox self.end()?; // end head-ibox
@ -1170,7 +1170,7 @@ impl<'a> State<'a> {
self.s.word(";")?; self.s.word(";")?;
self.end()?; // end the outer cbox self.end()?; // end the outer cbox
} }
ast::ItemKind::Fn(ref decl, ref header, ref param_names, ref body) => { ast::ItemKind::Fn(ref decl, header, ref param_names, ref body) => {
self.head("")?; self.head("")?;
self.print_fn( self.print_fn(
decl, decl,
@ -1522,7 +1522,7 @@ impl<'a> State<'a> {
vis: &ast::Visibility) vis: &ast::Visibility)
-> io::Result<()> { -> io::Result<()> {
self.print_fn(&m.decl, self.print_fn(&m.decl,
&m.header, m.header,
Some(ident), Some(ident),
&generics, &generics,
vis) vis)
@ -2113,7 +2113,7 @@ impl<'a> State<'a> {
self.bclose_(expr.span, INDENT_UNIT)?; self.bclose_(expr.span, INDENT_UNIT)?;
} }
ast::ExprKind::Closure( ast::ExprKind::Closure(
capture_clause, ref asyncness, movability, ref decl, ref body, _) => { capture_clause, asyncness, movability, ref decl, ref body, _) => {
self.print_movability(movability)?; self.print_movability(movability)?;
self.print_asyncness(asyncness)?; self.print_asyncness(asyncness)?;
self.print_capture_clause(capture_clause)?; self.print_capture_clause(capture_clause)?;
@ -2710,7 +2710,7 @@ impl<'a> State<'a> {
pub fn print_fn(&mut self, pub fn print_fn(&mut self,
decl: &ast::FnDecl, decl: &ast::FnDecl,
header: &ast::FnHeader, header: ast::FnHeader,
name: Option<ast::Ident>, name: Option<ast::Ident>,
generics: &ast::Generics, generics: &ast::Generics,
vis: &ast::Visibility) -> io::Result<()> { vis: &ast::Visibility) -> io::Result<()> {
@ -2765,7 +2765,8 @@ impl<'a> State<'a> {
} }
} }
pub fn print_asyncness(&mut self, asyncness: &ast::IsAsync) -> io::Result<()> { pub fn print_asyncness(&mut self, asyncness: ast::IsAsync)
-> io::Result<()> {
if asyncness.is_async() { if asyncness.is_async() {
self.word_nbsp("async")?; self.word_nbsp("async")?;
} }
@ -3037,7 +3038,7 @@ impl<'a> State<'a> {
span: syntax_pos::DUMMY_SP, span: syntax_pos::DUMMY_SP,
}; };
self.print_fn(decl, self.print_fn(decl,
&ast::FnHeader { unsafety, abi, ..ast::FnHeader::default() }, ast::FnHeader { unsafety, abi, ..ast::FnHeader::default() },
name, name,
&generics, &generics,
&source_map::dummy_spanned(ast::VisibilityKind::Inherited))?; &source_map::dummy_spanned(ast::VisibilityKind::Inherited))?;
@ -3100,7 +3101,7 @@ impl<'a> State<'a> {
} }
pub fn print_fn_header_info(&mut self, pub fn print_fn_header_info(&mut self,
header: &ast::FnHeader, header: ast::FnHeader,
vis: &ast::Visibility) -> io::Result<()> { vis: &ast::Visibility) -> io::Result<()> {
self.s.word(visibility_qualified(vis, ""))?; self.s.word(visibility_qualified(vis, ""))?;
@ -3109,7 +3110,7 @@ impl<'a> State<'a> {
ast::Constness::Const => self.word_nbsp("const")? ast::Constness::Const => self.word_nbsp("const")?
} }
self.print_asyncness(&header.asyncness.node)?; self.print_asyncness(header.asyncness.node)?;
self.print_unsafety(header.unsafety)?; self.print_unsafety(header.unsafety)?;
if header.abi != Abi::Rust { if header.abi != Abi::Rust {
@ -3158,7 +3159,7 @@ mod tests {
assert_eq!( assert_eq!(
fun_to_string( fun_to_string(
&decl, &decl,
&ast::FnHeader { ast::FnHeader {
unsafety: ast::Unsafety::Normal, unsafety: ast::Unsafety::Normal,
constness: source_map::dummy_spanned(ast::Constness::NotConst), constness: source_map::dummy_spanned(ast::Constness::NotConst),
asyncness: source_map::dummy_spanned(ast::IsAsync::NotAsync), asyncness: source_map::dummy_spanned(ast::IsAsync::NotAsync),

3
src/libsyntax/visit.rs
View file

@ -544,9 +544,6 @@ pub fn walk_fn_ret_ty<'a, V: Visitor<'a>>(visitor: &mut V, ret_ty: &'a FunctionR
pub fn walk_fn_decl<'a, V: Visitor<'a>>(visitor: &mut V, function_declaration: &'a FnDecl) { pub fn walk_fn_decl<'a, V: Visitor<'a>>(visitor: &mut V, function_declaration: &'a FnDecl) {
for argument in &function_declaration.inputs { for argument in &function_declaration.inputs {
visitor.visit_pat(&argument.pat); visitor.visit_pat(&argument.pat);
if let ArgSource::AsyncFn(pat) = &argument.source {
visitor.visit_pat(pat);
}
visitor.visit_ty(&argument.ty) visitor.visit_ty(&argument.ty)
} }
visitor.visit_fn_ret_ty(&function_declaration.output) visitor.visit_fn_ret_ty(&function_declaration.output)

1
src/libsyntax_ext/deriving/debug.rs
View file

@ -129,7 +129,6 @@ fn stmt_let_undescore(cx: &mut ExtCtxt<'_>, sp: Span, expr: P<ast::Expr>) -> ast
id: ast::DUMMY_NODE_ID, id: ast::DUMMY_NODE_ID,
span: sp, span: sp,
attrs: ThinVec::new(), attrs: ThinVec::new(),
source: ast::LocalSource::Normal,
}); });
ast::Stmt { ast::Stmt {
id: ast::DUMMY_NODE_ID, id: ast::DUMMY_NODE_ID,