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Rollup merge of rust-lang#130349 - ShE3py:break_up_float, r=fmease
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Fix `Parser::break_up_float`'s right span

```rs
use std::mem::offset_of;

fn main() {
    offset_of!((u8,), 0.0);
}
```
Before:
```
error[E0609]: no field `0` on type `u8`
    --> ./main.rs:4:25
     |
4    |       offset_of!((u8,), 0.0);
     |  _____--------------------^-
     | |     |
     | |     in this macro invocation
5    | | }
...    |
     |
     = note: this error originates in the macro `offset_of` (in Nightly builds, run with -Z macro-backtrace for more info)

error: aborting due to 1 previous error
```
After:
```
error[E0609]: no field `0` on type `u8`
 --> ./main.rs:4:25
  |
4 |     offset_of!((u8,), 0.0);
  |                         ^

error: aborting due to 1 previous error
```

---
`@rustbot` label +A-parser +D-imprecise-spans
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@fmease
fmease authored Sep 14, 2024
2 parents d1701a5 + 4cb5849 commit 2b40fdb
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Showing 3 changed files with 56 additions and 58 deletions.
66 changes: 32 additions & 34 deletions compiler/rustc_parse/src/parser/expr.rs
View file
Original file line number Diff line number Diff line change
Expand Up @@ -49,7 +49,7 @@ enum DestructuredFloat {
/// 1.2 | 1.2e3
MiddleDot(Symbol, Span, Span, Symbol, Span),
/// Invalid
Error,
Error(ErrorGuaranteed),
}

impl<'a> Parser<'a> {
Expand Down Expand Up @@ -1008,7 +1008,7 @@ impl<'a> Parser<'a> {
self.mk_expr_tuple_field_access(lo, ident1_span, base, sym1, None);
self.mk_expr_tuple_field_access(lo, ident2_span, base1, sym2, suffix)
}
DestructuredFloat::Error => base,
DestructuredFloat::Error(_) => base,
})
}
_ => {
Expand All @@ -1018,7 +1018,7 @@ impl<'a> Parser<'a> {
}
}

fn error_unexpected_after_dot(&self) {
fn error_unexpected_after_dot(&self) -> ErrorGuaranteed {
let actual = pprust::token_to_string(&self.token);
let span = self.token.span;
let sm = self.psess.source_map();
Expand All @@ -1028,17 +1028,19 @@ impl<'a> Parser<'a> {
}
_ => (span, actual),
};
self.dcx().emit_err(errors::UnexpectedTokenAfterDot { span, actual });
self.dcx().emit_err(errors::UnexpectedTokenAfterDot { span, actual })
}

// We need an identifier or integer, but the next token is a float.
// Break the float into components to extract the identifier or integer.
/// We need an identifier or integer, but the next token is a float.
/// Break the float into components to extract the identifier or integer.
///
/// See also [`TokenKind::break_two_token_op`] which does similar splitting of `>>` into `>`.
//
// FIXME: With current `TokenCursor` it's hard to break tokens into more than 2
// parts unless those parts are processed immediately. `TokenCursor` should either
// support pushing "future tokens" (would be also helpful to `break_and_eat`), or
// we should break everything including floats into more basic proc-macro style
// tokens in the lexer (probably preferable).
// See also `TokenKind::break_two_token_op` which does similar splitting of `>>` into `>`.
// parts unless those parts are processed immediately. `TokenCursor` should either
// support pushing "future tokens" (would be also helpful to `break_and_eat`), or
// we should break everything including floats into more basic proc-macro style
// tokens in the lexer (probably preferable).
fn break_up_float(&self, float: Symbol, span: Span) -> DestructuredFloat {
#[derive(Debug)]
enum FloatComponent {
Expand Down Expand Up @@ -1078,34 +1080,30 @@ impl<'a> Parser<'a> {
DestructuredFloat::Single(Symbol::intern(i), span)
}
// 1.
[IdentLike(i), Punct('.')] => {
let (ident_span, dot_span) = if can_take_span_apart() {
let (span, ident_len) = (span.data(), BytePos::from_usize(i.len()));
let ident_span = span.with_hi(span.lo + ident_len);
let dot_span = span.with_lo(span.lo + ident_len);
(ident_span, dot_span)
[IdentLike(left), Punct('.')] => {
let (left_span, dot_span) = if can_take_span_apart() {
let left_span = span.with_hi(span.lo() + BytePos::from_usize(left.len()));
let dot_span = span.with_lo(left_span.hi());
(left_span, dot_span)
} else {
(span, span)
};
let symbol = Symbol::intern(i);
DestructuredFloat::TrailingDot(symbol, ident_span, dot_span)
let left = Symbol::intern(left);
DestructuredFloat::TrailingDot(left, left_span, dot_span)
}
// 1.2 | 1.2e3
[IdentLike(i1), Punct('.'), IdentLike(i2)] => {
let (ident1_span, dot_span, ident2_span) = if can_take_span_apart() {
let (span, ident1_len) = (span.data(), BytePos::from_usize(i1.len()));
let ident1_span = span.with_hi(span.lo + ident1_len);
let dot_span = span
.with_lo(span.lo + ident1_len)
.with_hi(span.lo + ident1_len + BytePos(1));
let ident2_span = self.token.span.with_lo(span.lo + ident1_len + BytePos(1));
(ident1_span, dot_span, ident2_span)
[IdentLike(left), Punct('.'), IdentLike(right)] => {
let (left_span, dot_span, right_span) = if can_take_span_apart() {
let left_span = span.with_hi(span.lo() + BytePos::from_usize(left.len()));
let dot_span = span.with_lo(left_span.hi()).with_hi(left_span.hi() + BytePos(1));
let right_span = span.with_lo(dot_span.hi());
(left_span, dot_span, right_span)
} else {
(span, span, span)
};
let symbol1 = Symbol::intern(i1);
let symbol2 = Symbol::intern(i2);
DestructuredFloat::MiddleDot(symbol1, ident1_span, dot_span, symbol2, ident2_span)
let left = Symbol::intern(left);
let right = Symbol::intern(right);
DestructuredFloat::MiddleDot(left, left_span, dot_span, right, right_span)
}
// 1e+ | 1e- (recovered)
[IdentLike(_), Punct('+' | '-')] |
Expand All @@ -1116,8 +1114,8 @@ impl<'a> Parser<'a> {
// 1.2e+3 | 1.2e-3
[IdentLike(_), Punct('.'), IdentLike(_), Punct('+' | '-'), IdentLike(_)] => {
// See the FIXME about `TokenCursor` above.
self.error_unexpected_after_dot();
DestructuredFloat::Error
let guar = self.error_unexpected_after_dot();
DestructuredFloat::Error(guar)
}
_ => panic!("unexpected components in a float token: {components:?}"),
}
Expand Down Expand Up @@ -1183,7 +1181,7 @@ impl<'a> Parser<'a> {
fields.insert(start_idx, Ident::new(symbol2, span2));
fields.insert(start_idx, Ident::new(symbol1, span1));
}
DestructuredFloat::Error => {
DestructuredFloat::Error(_) => {
trailing_dot = None;
fields.insert(start_idx, Ident::new(symbol, self.prev_token.span));
}
Expand Down
1 change: 1 addition & 0 deletions tests/ui/offset-of/offset-of-tuple.rs
View file
Original file line number Diff line number Diff line change
Expand Up @@ -28,6 +28,7 @@ type ComplexTup = (((u8, u8), u8), u8);

fn nested() {
offset_of!(((u8, u16), (u32, u16, u8)), 0.2); //~ ERROR no field `2`
offset_of!(((u8, u16), (u32, u16, u8)), 0.1e2); //~ ERROR no field `1e2`
offset_of!(((u8, u16), (u32, u16, u8)), 1.2);
offset_of!(((u8, u16), (u32, u16, u8)), 1.2.0); //~ ERROR no field `0`

Expand Down
47 changes: 23 additions & 24 deletions tests/ui/offset-of/offset-of-tuple.stderr
View file
Original file line number Diff line number Diff line change
Expand Up @@ -29,43 +29,43 @@ LL | { builtin # offset_of((u8, u8), 1 .) };
| ^

error: unexpected token: `)`
--> $DIR/offset-of-tuple.rs:46:45
--> $DIR/offset-of-tuple.rs:47:45
|
LL | { builtin # offset_of(ComplexTup, 0.0.1.) };
| ^

error: unexpected token: `)`
--> $DIR/offset-of-tuple.rs:47:46
--> $DIR/offset-of-tuple.rs:48:46
|
LL | { builtin # offset_of(ComplexTup, 0 .0.1.) };
| ^

error: unexpected token: `)`
--> $DIR/offset-of-tuple.rs:48:47
--> $DIR/offset-of-tuple.rs:49:47
|
LL | { builtin # offset_of(ComplexTup, 0 . 0.1.) };
| ^

error: unexpected token: `)`
--> $DIR/offset-of-tuple.rs:49:46
--> $DIR/offset-of-tuple.rs:50:46
|
LL | { builtin # offset_of(ComplexTup, 0. 0.1.) };
| ^

error: unexpected token: `)`
--> $DIR/offset-of-tuple.rs:50:46
--> $DIR/offset-of-tuple.rs:51:46
|
LL | { builtin # offset_of(ComplexTup, 0.0 .1.) };
| ^

error: unexpected token: `)`
--> $DIR/offset-of-tuple.rs:51:47
--> $DIR/offset-of-tuple.rs:52:47
|
LL | { builtin # offset_of(ComplexTup, 0.0 . 1.) };
| ^

error: unexpected token: `)`
--> $DIR/offset-of-tuple.rs:52:46
--> $DIR/offset-of-tuple.rs:53:46
|
LL | { builtin # offset_of(ComplexTup, 0.0. 1.) };
| ^
Expand Down Expand Up @@ -104,43 +104,43 @@ LL | offset_of!((u8, u8), 1 .);
| ^

error: unexpected token: `)`
--> $DIR/offset-of-tuple.rs:35:34
--> $DIR/offset-of-tuple.rs:36:34
|
LL | offset_of!(ComplexTup, 0.0.1.);
| ^

error: unexpected token: `)`
--> $DIR/offset-of-tuple.rs:36:35
--> $DIR/offset-of-tuple.rs:37:35
|
LL | offset_of!(ComplexTup, 0 .0.1.);
| ^

error: unexpected token: `)`
--> $DIR/offset-of-tuple.rs:37:36
--> $DIR/offset-of-tuple.rs:38:36
|
LL | offset_of!(ComplexTup, 0 . 0.1.);
| ^

error: unexpected token: `)`
--> $DIR/offset-of-tuple.rs:38:35
--> $DIR/offset-of-tuple.rs:39:35
|
LL | offset_of!(ComplexTup, 0. 0.1.);
| ^

error: unexpected token: `)`
--> $DIR/offset-of-tuple.rs:39:35
--> $DIR/offset-of-tuple.rs:40:35
|
LL | offset_of!(ComplexTup, 0.0 .1.);
| ^

error: unexpected token: `)`
--> $DIR/offset-of-tuple.rs:40:36
--> $DIR/offset-of-tuple.rs:41:36
|
LL | offset_of!(ComplexTup, 0.0 . 1.);
| ^

error: unexpected token: `)`
--> $DIR/offset-of-tuple.rs:41:35
--> $DIR/offset-of-tuple.rs:42:35
|
LL | offset_of!(ComplexTup, 0.0. 1.);
| ^
Expand Down Expand Up @@ -196,22 +196,21 @@ LL | builtin # offset_of((u8, u8), 1_u8);
error[E0609]: no field `2` on type `(u8, u16)`
--> $DIR/offset-of-tuple.rs:30:47
|
LL | offset_of!(((u8, u16), (u32, u16, u8)), 0.2);
| _____------------------------------------------^-
| | |
| | in this macro invocation
LL | | offset_of!(((u8, u16), (u32, u16, u8)), 1.2);
LL | | offset_of!(((u8, u16), (u32, u16, u8)), 1.2.0);
... |
LL | offset_of!(((u8, u16), (u32, u16, u8)), 0.2);
| ^

error[E0609]: no field `1e2` on type `(u8, u16)`
--> $DIR/offset-of-tuple.rs:31:47
|
= note: this error originates in the macro `offset_of` (in Nightly builds, run with -Z macro-backtrace for more info)
LL | offset_of!(((u8, u16), (u32, u16, u8)), 0.1e2);
| ^^^

error[E0609]: no field `0` on type `u8`
--> $DIR/offset-of-tuple.rs:32:49
--> $DIR/offset-of-tuple.rs:33:49
|
LL | offset_of!(((u8, u16), (u32, u16, u8)), 1.2.0);
| ^

error: aborting due to 33 previous errors
error: aborting due to 34 previous errors

For more information about this error, try `rustc --explain E0609`.

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