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Improve check-cfg diagnostics (part 2)

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This commit is contained in:
Urgau 2023-04-30 19:09:15 +02:00
parent a5f8dba4cd
commit 53647845b9
12 changed files with 192 additions and 47 deletions
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7
compiler/rustc_attr/src/builtin.rs
View File

@ -589,7 +589,7 @@ pub fn cfg_matches(
cfg.span,
lint_node_id,
"unexpected `cfg` condition value",
BuiltinLintDiagnostics::UnexpectedCfg(
BuiltinLintDiagnostics::UnexpectedCfgValue(
(cfg.name, cfg.name_span),
cfg.value.map(|v| (v, cfg.value_span.unwrap())),
),
@ -601,7 +601,10 @@ pub fn cfg_matches(
cfg.span,
lint_node_id,
"unexpected `cfg` condition name",
BuiltinLintDiagnostics::UnexpectedCfg((cfg.name, cfg.name_span), None),
BuiltinLintDiagnostics::UnexpectedCfgName(
(cfg.name, cfg.name_span),
cfg.value.map(|v| (v, cfg.value_span.unwrap())),
),
);
}
_ => { /* not unexpected */ }

54
compiler/rustc_lint/src/context.rs
View File

@ -36,6 +36,7 @@ use rustc_middle::middle::stability;
use rustc_middle::ty::layout::{LayoutError, LayoutOfHelpers, TyAndLayout};
use rustc_middle::ty::print::with_no_trimmed_paths;
use rustc_middle::ty::{self, print::Printer, subst::GenericArg, RegisteredTools, Ty, TyCtxt};
use rustc_session::config::ExpectedValues;
use rustc_session::lint::{BuiltinLintDiagnostics, LintExpectationId};
use rustc_session::lint::{FutureIncompatibleInfo, Level, Lint, LintBuffer, LintId};
use rustc_session::Session;
@ -768,23 +769,51 @@ pub trait LintContext: Sized {
db.help(help);
db.note("see the asm section of Rust By Example <https://doc.rust-lang.org/nightly/rust-by-example/unsafe/asm.html#labels> for more information");
},
BuiltinLintDiagnostics::UnexpectedCfg((name, name_span), None) => {
BuiltinLintDiagnostics::UnexpectedCfgName((name, name_span), value) => {
let possibilities: Vec<Symbol> = sess.parse_sess.check_config.expecteds.keys().map(|s| *s).collect();
// Suggest the most probable if we found one
if let Some(best_match) = find_best_match_for_name(&possibilities, name, None) {
db.span_suggestion(name_span, "there is an config with a similar name", best_match, Applicability::MaybeIncorrect);
if let Some(ExpectedValues::Some(best_match_values)) =
sess.parse_sess.check_config.expecteds.get(&best_match) {
let mut possibilities = best_match_values.iter()
.flatten()
.map(Symbol::as_str)
.collect::<Vec<_>>();
possibilities.sort();
if let Some((value, value_span)) = value {
if best_match_values.contains(&Some(value)) {
db.span_suggestion(name_span, "there is a config with a similar name and value", best_match, Applicability::MaybeIncorrect);
} else if best_match_values.contains(&None) {
db.span_suggestion(name_span.to(value_span), "there is a config with a similar name and no value", best_match, Applicability::MaybeIncorrect);
} else if let Some(first_value) = possibilities.first() {
db.span_suggestion(name_span.to(value_span), "there is a config with a similar name and different values", format!("{best_match} = \"{first_value}\""), Applicability::MaybeIncorrect);
} else {
db.span_suggestion(name_span.to(value_span), "there is a config with a similar name and different values", best_match, Applicability::MaybeIncorrect);
};
} else {
db.span_suggestion(name_span, "there is a config with a similar name", best_match, Applicability::MaybeIncorrect);
}
if !possibilities.is_empty() {
let possibilities = possibilities.join("`, `");
db.help(format!("expected values for `{best_match}` are: `{possibilities}`"));
}
} else {
db.span_suggestion(name_span, "there is a config with a similar name", best_match, Applicability::MaybeIncorrect);
}
}
},
BuiltinLintDiagnostics::UnexpectedCfg((name, name_span), Some((value, value_span))) => {
let Some(rustc_session::config::ExpectedValues::Some(values)) = &sess.parse_sess.check_config.expecteds.get(&name) else {
BuiltinLintDiagnostics::UnexpectedCfgValue((name, name_span), value) => {
let Some(ExpectedValues::Some(values)) = &sess.parse_sess.check_config.expecteds.get(&name) else {
bug!("it shouldn't be possible to have a diagnostic on a value whose name is not in values");
};
let mut have_none_possibility = false;
let possibilities: Vec<Symbol> = values.iter()
.inspect(|a| have_none_possibility |= a.is_none())
.copied()
.filter_map(std::convert::identity)
.flatten()
.collect();
// Show the full list if all possible values for a given name, but don't do it
@ -800,13 +829,20 @@ pub trait LintContext: Sized {
db.note(format!("expected values for `{name}` are: {none}`{possibilities}`"));
}
// Suggest the most probable if we found one
if let Some(best_match) = find_best_match_for_name(&possibilities, value, None) {
db.span_suggestion(value_span, "there is an expected value with a similar name", format!("\"{best_match}\""), Applicability::MaybeIncorrect);
if let Some((value, value_span)) = value {
// Suggest the most probable if we found one
if let Some(best_match) = find_best_match_for_name(&possibilities, value, None) {
db.span_suggestion(value_span, "there is a expected value with a similar name", format!("\"{best_match}\""), Applicability::MaybeIncorrect);
}
} else if let &[first_possibility] = &possibilities[..] {
db.span_suggestion(name_span.shrink_to_hi(), "specify a config value", format!(" = \"{first_possibility}\""), Applicability::MaybeIncorrect);
}
} else if have_none_possibility {
db.note(format!("no expected value for `{name}`"));
db.span_suggestion(name_span.shrink_to_hi().to(value_span), "remove the value", "", Applicability::MaybeIncorrect);
if let Some((_value, value_span)) = value {
db.span_suggestion(name_span.shrink_to_hi().to(value_span), "remove the value", "", Applicability::MaybeIncorrect);
}
}
},
BuiltinLintDiagnostics::DeprecatedWhereclauseLocation(new_span, suggestion) => {

3
compiler/rustc_lint_defs/src/lib.rs
View File

@ -496,7 +496,8 @@ pub enum BuiltinLintDiagnostics {
BreakWithLabelAndLoop(Span),
NamedAsmLabel(String),
UnicodeTextFlow(Span, String),
UnexpectedCfg((Symbol, Span), Option<(Symbol, Span)>),
UnexpectedCfgName((Symbol, Span), Option<(Symbol, Span)>),
UnexpectedCfgValue((Symbol, Span), Option<(Symbol, Span)>),
DeprecatedWhereclauseLocation(Span, String),
SingleUseLifetime {
/// Span of the parameter which declares this lifetime.

31
tests/ui/check-cfg/diagnotics.rs Normal file
View File

@ -0,0 +1,31 @@
// check-pass
// compile-flags: --check-cfg=names() --check-cfg=values(feature,"foo") --check-cfg=values(no_values) -Z unstable-options
#[cfg(featur)]
//~^ WARNING unexpected `cfg` condition name
fn feature() {}
#[cfg(featur = "foo")]
//~^ WARNING unexpected `cfg` condition name
fn feature() {}
#[cfg(featur = "fo")]
//~^ WARNING unexpected `cfg` condition name
fn feature() {}
#[cfg(feature = "foo")]
fn feature() {}
#[cfg(no_value)]
//~^ WARNING unexpected `cfg` condition name
fn no_values() {}
#[cfg(no_value = "foo")]
//~^ WARNING unexpected `cfg` condition name
fn no_values() {}
#[cfg(no_values = "bar")]
//~^ WARNING unexpected `cfg` condition value
fn no_values() {}
fn main() {}

62
tests/ui/check-cfg/diagnotics.stderr Normal file
View File

@ -0,0 +1,62 @@
warning: unexpected `cfg` condition name
--> $DIR/diagnotics.rs:4:7
|
LL | #[cfg(featur)]
| ^^^^^^ help: there is a config with a similar name: `feature`
|
= help: expected values for `feature` are: `foo`
= note: `#[warn(unexpected_cfgs)]` on by default
warning: unexpected `cfg` condition name
--> $DIR/diagnotics.rs:8:7
|
LL | #[cfg(featur = "foo")]
| ^^^^^^^^^^^^^^
|
= help: expected values for `feature` are: `foo`
help: there is a config with a similar name and value
|
LL | #[cfg(feature = "foo")]
| ~~~~~~~
warning: unexpected `cfg` condition name
--> $DIR/diagnotics.rs:12:7
|
LL | #[cfg(featur = "fo")]
| ^^^^^^^^^^^^^
|
= help: expected values for `feature` are: `foo`
help: there is a config with a similar name and different values
|
LL | #[cfg(feature = "foo")]
| ~~~~~~~~~~~~~~~
warning: unexpected `cfg` condition name
--> $DIR/diagnotics.rs:19:7
|
LL | #[cfg(no_value)]
| ^^^^^^^^ help: there is a config with a similar name: `no_values`
warning: unexpected `cfg` condition name
--> $DIR/diagnotics.rs:23:7
|
LL | #[cfg(no_value = "foo")]
| ^^^^^^^^^^^^^^^^
|
help: there is a config with a similar name and no value
|
LL | #[cfg(no_values)]
| ~~~~~~~~~
warning: unexpected `cfg` condition value
--> $DIR/diagnotics.rs:27:7
|
LL | #[cfg(no_values = "bar")]
| ^^^^^^^^^--------
| |
| help: remove the value
|
= note: no expected value for `no_values`
warning: 6 warnings emitted

2
tests/ui/check-cfg/invalid-cfg-name.stderr
View File

@ -2,7 +2,7 @@ warning: unexpected `cfg` condition name
--> $DIR/invalid-cfg-name.rs:7:7
|
LL | #[cfg(widnows)]
| ^^^^^^^ help: there is an config with a similar name: `windows`
| ^^^^^^^ help: there is a config with a similar name: `windows`
|
= note: `#[warn(unexpected_cfgs)]` on by default

2
tests/ui/check-cfg/invalid-cfg-value.stderr
View File

@ -4,7 +4,7 @@ warning: unexpected `cfg` condition value
LL | #[cfg(feature = "sedre")]
| ^^^^^^^^^^-------
| |
| help: there is an expected value with a similar name: `"serde"`
| help: there is a expected value with a similar name: `"serde"`
|
= note: expected values for `feature` are: `full`, `serde`
= note: `#[warn(unexpected_cfgs)]` on by default

4
tests/ui/check-cfg/mix.rs
View File

@ -12,6 +12,10 @@ fn do_windows_stuff() {}
//~^ WARNING unexpected `cfg` condition name
fn do_windows_stuff() {}
#[cfg(feature)]
//~^ WARNING unexpected `cfg` condition value
fn no_feature() {}
#[cfg(feature = "foo")]
fn use_foo() {}

62
tests/ui/check-cfg/mix.stderr
View File

@ -2,12 +2,20 @@ warning: unexpected `cfg` condition name
--> $DIR/mix.rs:11:7
|
LL | #[cfg(widnows)]
| ^^^^^^^ help: there is an config with a similar name: `windows`
| ^^^^^^^ help: there is a config with a similar name: `windows`
|
= note: `#[warn(unexpected_cfgs)]` on by default
warning: unexpected `cfg` condition value
--> $DIR/mix.rs:18:7
--> $DIR/mix.rs:15:7
|
LL | #[cfg(feature)]
| ^^^^^^^- help: specify a config value: `= "foo"`
|
= note: expected values for `feature` are: `foo`
warning: unexpected `cfg` condition value
--> $DIR/mix.rs:22:7
|
LL | #[cfg(feature = "bar")]
| ^^^^^^^^^^^^^^^
@ -15,7 +23,7 @@ LL | #[cfg(feature = "bar")]
= note: expected values for `feature` are: `foo`
warning: unexpected `cfg` condition value
--> $DIR/mix.rs:22:7
--> $DIR/mix.rs:26:7
|
LL | #[cfg(feature = "zebra")]
| ^^^^^^^^^^^^^^^^^
@ -23,7 +31,7 @@ LL | #[cfg(feature = "zebra")]
= note: expected values for `feature` are: `foo`
warning: unexpected `cfg` condition name
--> $DIR/mix.rs:26:12
--> $DIR/mix.rs:30:12
|
LL | #[cfg_attr(uu, test)]
| ^^
@ -37,13 +45,13 @@ warning: unexpected `unknown_name` as condition name
= help: was set with `--cfg` but isn't in the `--check-cfg` expected names
warning: unexpected `cfg` condition name
--> $DIR/mix.rs:35:10
--> $DIR/mix.rs:39:10
|
LL | cfg!(widnows);
| ^^^^^^^ help: there is an config with a similar name: `windows`
| ^^^^^^^ help: there is a config with a similar name: `windows`
warning: unexpected `cfg` condition value
--> $DIR/mix.rs:38:10
--> $DIR/mix.rs:42:10
|
LL | cfg!(feature = "bar");
| ^^^^^^^^^^^^^^^
@ -51,7 +59,7 @@ LL | cfg!(feature = "bar");
= note: expected values for `feature` are: `foo`
warning: unexpected `cfg` condition value
--> $DIR/mix.rs:40:10
--> $DIR/mix.rs:44:10
|
LL | cfg!(feature = "zebra");
| ^^^^^^^^^^^^^^^^^
@ -59,25 +67,25 @@ LL | cfg!(feature = "zebra");
= note: expected values for `feature` are: `foo`
warning: unexpected `cfg` condition name
--> $DIR/mix.rs:42:10
--> $DIR/mix.rs:46:10
|
LL | cfg!(xxx = "foo");
| ^^^^^^^^^^^
warning: unexpected `cfg` condition name
--> $DIR/mix.rs:44:10
--> $DIR/mix.rs:48:10
|
LL | cfg!(xxx);
| ^^^
warning: unexpected `cfg` condition name
--> $DIR/mix.rs:46:14
--> $DIR/mix.rs:50:14
|
LL | cfg!(any(xxx, windows));
| ^^^
warning: unexpected `cfg` condition value
--> $DIR/mix.rs:48:14
--> $DIR/mix.rs:52:14
|
LL | cfg!(any(feature = "bad", windows));
| ^^^^^^^^^^^^^^^
@ -85,43 +93,43 @@ LL | cfg!(any(feature = "bad", windows));
= note: expected values for `feature` are: `foo`
warning: unexpected `cfg` condition name
--> $DIR/mix.rs:50:23
--> $DIR/mix.rs:54:23
|
LL | cfg!(any(windows, xxx));
| ^^^
warning: unexpected `cfg` condition name
--> $DIR/mix.rs:52:20
--> $DIR/mix.rs:56:20
|
LL | cfg!(all(unix, xxx));
| ^^^
warning: unexpected `cfg` condition name
--> $DIR/mix.rs:54:14
--> $DIR/mix.rs:58:14
|
LL | cfg!(all(aa, bb));
| ^^
warning: unexpected `cfg` condition name
--> $DIR/mix.rs:54:18
--> $DIR/mix.rs:58:18
|
LL | cfg!(all(aa, bb));
| ^^
warning: unexpected `cfg` condition name
--> $DIR/mix.rs:57:14
--> $DIR/mix.rs:61:14
|
LL | cfg!(any(aa, bb));
| ^^
warning: unexpected `cfg` condition name
--> $DIR/mix.rs:57:18
--> $DIR/mix.rs:61:18
|
LL | cfg!(any(aa, bb));
| ^^
warning: unexpected `cfg` condition value
--> $DIR/mix.rs:60:20
--> $DIR/mix.rs:64:20
|
LL | cfg!(any(unix, feature = "zebra"));
| ^^^^^^^^^^^^^^^^^
@ -129,13 +137,13 @@ LL | cfg!(any(unix, feature = "zebra"));
= note: expected values for `feature` are: `foo`
warning: unexpected `cfg` condition name
--> $DIR/mix.rs:62:14
--> $DIR/mix.rs:66:14
|
LL | cfg!(any(xxx, feature = "zebra"));
| ^^^
warning: unexpected `cfg` condition value
--> $DIR/mix.rs:62:19
--> $DIR/mix.rs:66:19
|
LL | cfg!(any(xxx, feature = "zebra"));
| ^^^^^^^^^^^^^^^^^
@ -143,19 +151,19 @@ LL | cfg!(any(xxx, feature = "zebra"));
= note: expected values for `feature` are: `foo`
warning: unexpected `cfg` condition name
--> $DIR/mix.rs:65:14
--> $DIR/mix.rs:69:14
|
LL | cfg!(any(xxx, unix, xxx));
| ^^^
warning: unexpected `cfg` condition name
--> $DIR/mix.rs:65:25
--> $DIR/mix.rs:69:25
|
LL | cfg!(any(xxx, unix, xxx));
| ^^^
warning: unexpected `cfg` condition value
--> $DIR/mix.rs:68:14
--> $DIR/mix.rs:72:14
|
LL | cfg!(all(feature = "zebra", feature = "zebra", feature = "zebra"));
| ^^^^^^^^^^^^^^^^^
@ -163,7 +171,7 @@ LL | cfg!(all(feature = "zebra", feature = "zebra", feature = "zebra"));
= note: expected values for `feature` are: `foo`
warning: unexpected `cfg` condition value
--> $DIR/mix.rs:68:33
--> $DIR/mix.rs:72:33
|
LL | cfg!(all(feature = "zebra", feature = "zebra", feature = "zebra"));
| ^^^^^^^^^^^^^^^^^
@ -171,12 +179,12 @@ LL | cfg!(all(feature = "zebra", feature = "zebra", feature = "zebra"));
= note: expected values for `feature` are: `foo`
warning: unexpected `cfg` condition value
--> $DIR/mix.rs:68:52
--> $DIR/mix.rs:72:52
|
LL | cfg!(all(feature = "zebra", feature = "zebra", feature = "zebra"));
| ^^^^^^^^^^^^^^^^^
|
= note: expected values for `feature` are: `foo`
warning: 27 warnings emitted
warning: 28 warnings emitted

2
tests/ui/check-cfg/values-target-json.stderr
View File

@ -4,7 +4,7 @@ warning: unexpected `cfg` condition value
LL | #[cfg(target_os = "linuz")]
| ^^^^^^^^^^^^-------
| |
| help: there is an expected value with a similar name: `"linux"`
| help: there is a expected value with a similar name: `"linux"`
|
= note: expected values for `target_os` are: `aix`, `android`, `cuda`, `dragonfly`, `emscripten`, `ericos`, `espidf`, `freebsd`, `fuchsia`, `haiku`, `hermit`, `horizon`, `illumos`, `ios`, `l4re`, `linux`, `macos`, `netbsd`, `none`, `nto`, `openbsd`, `psp`, `redox`, `solaris`, `solid_asp3`, `tvos`, `uefi`, `unknown`, `vita`, `vxworks`, `wasi`, `watchos`, `windows`, `xous`
= note: `#[warn(unexpected_cfgs)]` on by default

6
tests/ui/check-cfg/well-known-names.stderr
View File

@ -4,7 +4,7 @@ warning: unexpected `cfg` condition name
LL | #[cfg(target_oz = "linux")]
| ---------^^^^^^^^^^
| |
| help: there is an config with a similar name: `target_os`
| help: there is a config with a similar name: `target_os`
|
= note: `#[warn(unexpected_cfgs)]` on by default
@ -14,13 +14,13 @@ warning: unexpected `cfg` condition name
LL | #[cfg(features = "foo")]
| --------^^^^^^^^
| |
| help: there is an config with a similar name: `feature`
| help: there is a config with a similar name: `feature`
warning: unexpected `cfg` condition name
--> $DIR/well-known-names.rs:20:7
|
LL | #[cfg(uniw)]
| ^^^^ help: there is an config with a similar name: `unix`
| ^^^^ help: there is a config with a similar name: `unix`
warning: 3 warnings emitted

4
tests/ui/check-cfg/well-known-values.stderr
View File

@ -4,7 +4,7 @@ warning: unexpected `cfg` condition value
LL | #[cfg(target_os = "linuz")]
| ^^^^^^^^^^^^-------
| |
| help: there is an expected value with a similar name: `"linux"`
| help: there is a expected value with a similar name: `"linux"`
|
= note: expected values for `target_os` are: `aix`, `android`, `cuda`, `dragonfly`, `emscripten`, `espidf`, `freebsd`, `fuchsia`, `haiku`, `hermit`, `horizon`, `illumos`, `ios`, `l4re`, `linux`, `macos`, `netbsd`, `none`, `nto`, `openbsd`, `psp`, `redox`, `solaris`, `solid_asp3`, `tvos`, `uefi`, `unknown`, `vita`, `vxworks`, `wasi`, `watchos`, `windows`, `xous`
= note: `#[warn(unexpected_cfgs)]` on by default
@ -15,7 +15,7 @@ warning: unexpected `cfg` condition value
LL | #[cfg(target_has_atomic = "0")]
| ^^^^^^^^^^^^^^^^^^^^---
| |
| help: there is an expected value with a similar name: `"8"`
| help: there is a expected value with a similar name: `"8"`
|
= note: expected values for `target_has_atomic` are: (none), `128`, `16`, `32`, `64`, `8`, `ptr`