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Stop using gensyms in HIR lowering #60960

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Merged
merged 1 commit into from
May 20, 2019
Merged

Stop using gensyms in HIR lowering #60960

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37 changes: 15 additions & 22 deletions src/librustc/hir/lowering.rs
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -855,10 +855,6 @@ impl<'a> LoweringContext<'a> {
self.sess.diagnostic()
}

fn str_to_ident(&self, s: &'static str) -> Ident {
Ident::with_empty_ctxt(Symbol::gensym(s))
}

fn with_anonymous_lifetime_mode<R>(
&mut self,
anonymous_lifetime_mode: AnonymousLifetimeMode,
Expand Down Expand Up @@ -4621,18 +4617,18 @@ impl<'a> LoweringContext<'a> {
);
head.span = desugared_span;

let iter = self.str_to_ident("iter");
let iter = Ident::with_empty_ctxt(sym::iter);

let next_ident = self.str_to_ident("__next");
let next_ident = Ident::with_empty_ctxt(sym::__next);
let (next_pat, next_pat_hid) = self.pat_ident_binding_mode(
desugared_span,
next_ident,
hir::BindingAnnotation::Mutable,
);

// `::std::option::Option::Some(val) => next = val`
// `::std::option::Option::Some(val) => __next = val`
let pat_arm = {
let val_ident = self.str_to_ident("val");
let val_ident = Ident::with_empty_ctxt(sym::val);
let (val_pat, val_pat_hid) = self.pat_ident(pat.span, val_ident);
let val_expr = P(self.expr_ident(pat.span, val_ident, val_pat_hid));
let next_expr = P(self.expr_ident(pat.span, next_ident, next_pat_hid));
Expand Down Expand Up @@ -4771,17 +4767,13 @@ impl<'a> LoweringContext<'a> {
let unstable_span = self.sess.source_map().mark_span_with_reason(
CompilerDesugaringKind::QuestionMark,
e.span,
Some(vec![
Symbol::intern("try_trait")
].into()),
Some(vec![sym::try_trait].into()),
);
let try_span = self.sess.source_map().end_point(e.span);
let try_span = self.sess.source_map().mark_span_with_reason(
CompilerDesugaringKind::QuestionMark,
try_span,
Some(vec![
Symbol::intern("try_trait")
].into()),
Some(vec![sym::try_trait].into()),
);

// `Try::into_result(<expr>)`
Expand All @@ -4802,7 +4794,8 @@ impl<'a> LoweringContext<'a> {
// `allow(unreachable_code)`
let allow = {
let allow_ident = Ident::with_empty_ctxt(sym::allow).with_span_pos(e.span);
let uc_ident = Ident::from_str("unreachable_code").with_span_pos(e.span);
let uc_ident = Ident::with_empty_ctxt(sym::unreachable_code)
.with_span_pos(e.span);
let uc_nested = attr::mk_nested_word_item(uc_ident);
attr::mk_list_item(e.span, allow_ident, vec![uc_nested])
};
Expand All @@ -4812,7 +4805,7 @@ impl<'a> LoweringContext<'a> {

// `Ok(val) => #[allow(unreachable_code)] val,`
let ok_arm = {
let val_ident = self.str_to_ident("val");
let val_ident = Ident::with_empty_ctxt(sym::val);
let (val_pat, val_pat_nid) = self.pat_ident(e.span, val_ident);
let val_expr = P(self.expr_ident_with_attrs(
e.span,
Expand All @@ -4828,7 +4821,7 @@ impl<'a> LoweringContext<'a> {
// `Err(err) => #[allow(unreachable_code)]
// return Try::from_error(From::from(err)),`
let err_arm = {
let err_ident = self.str_to_ident("err");
let err_ident = Ident::with_empty_ctxt(sym::err);
let (err_local, err_local_nid) = self.pat_ident(try_span, err_ident);
let from_expr = {
let from_path = &[sym::convert, sym::From, sym::from];
Expand Down Expand Up @@ -5552,7 +5545,7 @@ impl<'a> LoweringContext<'a> {
// match ::std::future::poll_with_tls_context(unsafe {
// ::std::pin::Pin::new_unchecked(&mut pinned)
// }) {
// ::std::task::Poll::Ready(x) => break x,
// ::std::task::Poll::Ready(result) => break result,
// ::std::task::Poll::Pending => {},
// }
// yield ();
Expand Down Expand Up @@ -5580,12 +5573,12 @@ impl<'a> LoweringContext<'a> {
let gen_future_span = self.sess.source_map().mark_span_with_reason(
CompilerDesugaringKind::Await,
await_span,
Some(vec![Symbol::intern("gen_future")].into()),
Some(vec![sym::gen_future].into()),
);

// let mut pinned = <expr>;
let expr = P(self.lower_expr(expr));
let pinned_ident = self.str_to_ident("pinned");
let pinned_ident = Ident::with_empty_ctxt(sym::pinned);
let (pinned_pat, pinned_pat_hid) = self.pat_ident_binding_mode(
span,
pinned_ident,
Expand Down Expand Up @@ -5621,11 +5614,11 @@ impl<'a> LoweringContext<'a> {
))
};

// `::std::task::Poll::Ready(x) => break x`
// `::std::task::Poll::Ready(result) => break result`
let loop_node_id = self.sess.next_node_id();
let loop_hir_id = self.lower_node_id(loop_node_id);
let ready_arm = {
let x_ident = self.str_to_ident("x");
let x_ident = Ident::with_empty_ctxt(sym::result);
let (x_pat, x_pat_hid) = self.pat_ident(span, x_ident);
let x_expr = P(self.expr_ident(span, x_ident, x_pat_hid));
let ready_pat = self.pat_std_enum(
Expand Down
7 changes: 7 additions & 0 deletions src/libsyntax_pos/symbol.rs
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -229,6 +229,7 @@ symbols! {
eh_personality,
eh_unwind_resume,
enable,
err,
Err,
except,
exclusive_range_pattern,
Expand Down Expand Up @@ -260,6 +261,7 @@ symbols! {
fundamental,
future,
Future,
gen_future,
generators,
generic_associated_types,
generic_param_attrs,
Expand Down Expand Up @@ -361,6 +363,7 @@ symbols! {
never,
never_type,
next,
__next,
nll,
no_builtins,
no_core,
Expand Down Expand Up @@ -406,6 +409,7 @@ symbols! {
Pending,
pin,
Pin,
pinned,
platform_intrinsics,
plugin,
plugin_registrar,
Expand Down Expand Up @@ -569,6 +573,7 @@ symbols! {
trivial_bounds,
Try,
try_blocks,
try_trait,
tuple_indexing,
ty,
type_alias_enum_variants,
Expand All @@ -587,6 +592,7 @@ symbols! {
uniform_paths,
universal_impl_trait,
unmarked_api,
unreachable_code,
unrestricted_attribute_tokens,
unsafe_destructor_blind_to_params,
unsafe_no_drop_flag,
Expand All @@ -601,6 +607,7 @@ symbols! {
use_nested_groups,
usize,
v1,
val,
vis,
visible_private_types,
volatile,
Expand Down