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Auto merge of #102944 - nnethercote:ast-Lit-third-time-lucky, r=petrochenkov

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Use `token::Lit` in `ast::ExprKind::Lit`.

Instead of `ast::Lit`.

Literal lowering now happens at two different times. Expression literals are lowered when HIR is crated. Attribute literals are lowered during parsing.

r? `@petrochenkov`
This commit is contained in:
bors 2022-11-16 23:03:14 +00:00
commit cbd6159095
12 changed files with 90 additions and 77 deletions
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19
clippy_lints/src/almost_complete_letter_range.rs
View file

@ -73,12 +73,21 @@ impl EarlyLintPass for AlmostCompleteLetterRange {
}
fn check_range(cx: &EarlyContext<'_>, span: Span, start: &Expr, end: &Expr, sugg: Option<(Span, &str)>) {
if let ExprKind::Lit(start_lit) = &start.peel_parens().kind
&& let ExprKind::Lit(end_lit) = &end.peel_parens().kind
if let ExprKind::Lit(start_token_lit) = start.peel_parens().kind
&& let ExprKind::Lit(end_token_lit) = end.peel_parens().kind
&& matches!(
(&start_lit.kind, &end_lit.kind),
(LitKind::Byte(b'a') | LitKind::Char('a'), LitKind::Byte(b'z') | LitKind::Char('z'))
| (LitKind::Byte(b'A') | LitKind::Char('A'), LitKind::Byte(b'Z') | LitKind::Char('Z'))
(
LitKind::from_token_lit(start_token_lit),
LitKind::from_token_lit(end_token_lit),
),
(
Ok(LitKind::Byte(b'a') | LitKind::Char('a')),
Ok(LitKind::Byte(b'z') | LitKind::Char('z'))
)
| (
Ok(LitKind::Byte(b'A') | LitKind::Char('A')),
Ok(LitKind::Byte(b'Z') | LitKind::Char('Z')),
)
)
&& !in_external_macro(cx.sess(), span)
{

23
clippy_lints/src/int_plus_one.rs
View file

@ -2,7 +2,8 @@
use clippy_utils::diagnostics::span_lint_and_sugg;
use clippy_utils::source::snippet_opt;
use rustc_ast::ast::{BinOpKind, Expr, ExprKind, Lit, LitKind};
use rustc_ast::ast::{BinOpKind, Expr, ExprKind, LitKind};
use rustc_ast::token;
use rustc_errors::Applicability;
use rustc_lint::{EarlyContext, EarlyLintPass};
use rustc_session::{declare_lint_pass, declare_tool_lint};
@ -52,8 +53,8 @@ enum Side {
impl IntPlusOne {
#[expect(clippy::cast_sign_loss)]
fn check_lit(lit: &Lit, target_value: i128) -> bool {
if let LitKind::Int(value, ..) = lit.kind {
fn check_lit(token_lit: token::Lit, target_value: i128) -> bool {
if let Ok(LitKind::Int(value, ..)) = LitKind::from_token_lit(token_lit) {
return value == (target_value as u128);
}
false
@ -65,11 +66,11 @@ impl IntPlusOne {
(BinOpKind::Ge, &ExprKind::Binary(ref lhskind, ref lhslhs, ref lhsrhs), _) => {
match (lhskind.node, &lhslhs.kind, &lhsrhs.kind) {
// `-1 + x`
(BinOpKind::Add, &ExprKind::Lit(ref lit), _) if Self::check_lit(lit, -1) => {
(BinOpKind::Add, &ExprKind::Lit(lit), _) if Self::check_lit(lit, -1) => {
Self::generate_recommendation(cx, binop, lhsrhs, rhs, Side::Lhs)
},
// `x - 1`
(BinOpKind::Sub, _, &ExprKind::Lit(ref lit)) if Self::check_lit(lit, 1) => {
(BinOpKind::Sub, _, &ExprKind::Lit(lit)) if Self::check_lit(lit, 1) => {
Self::generate_recommendation(cx, binop, lhslhs, rhs, Side::Lhs)
},
_ => None,
@ -81,10 +82,10 @@ impl IntPlusOne {
{
match (&rhslhs.kind, &rhsrhs.kind) {
// `y + 1` and `1 + y`
(&ExprKind::Lit(ref lit), _) if Self::check_lit(lit, 1) => {
(&ExprKind::Lit(lit), _) if Self::check_lit(lit, 1) => {
Self::generate_recommendation(cx, binop, rhsrhs, lhs, Side::Rhs)
},
(_, &ExprKind::Lit(ref lit)) if Self::check_lit(lit, 1) => {
(_, &ExprKind::Lit(lit)) if Self::check_lit(lit, 1) => {
Self::generate_recommendation(cx, binop, rhslhs, lhs, Side::Rhs)
},
_ => None,
@ -96,10 +97,10 @@ impl IntPlusOne {
{
match (&lhslhs.kind, &lhsrhs.kind) {
// `1 + x` and `x + 1`
(&ExprKind::Lit(ref lit), _) if Self::check_lit(lit, 1) => {
(&ExprKind::Lit(lit), _) if Self::check_lit(lit, 1) => {
Self::generate_recommendation(cx, binop, lhsrhs, rhs, Side::Lhs)
},
(_, &ExprKind::Lit(ref lit)) if Self::check_lit(lit, 1) => {
(_, &ExprKind::Lit(lit)) if Self::check_lit(lit, 1) => {
Self::generate_recommendation(cx, binop, lhslhs, rhs, Side::Lhs)
},
_ => None,
@ -109,11 +110,11 @@ impl IntPlusOne {
(BinOpKind::Le, _, &ExprKind::Binary(ref rhskind, ref rhslhs, ref rhsrhs)) => {
match (rhskind.node, &rhslhs.kind, &rhsrhs.kind) {
// `-1 + y`
(BinOpKind::Add, &ExprKind::Lit(ref lit), _) if Self::check_lit(lit, -1) => {
(BinOpKind::Add, &ExprKind::Lit(lit), _) if Self::check_lit(lit, -1) => {
Self::generate_recommendation(cx, binop, rhsrhs, lhs, Side::Rhs)
},
// `y - 1`
(BinOpKind::Sub, _, &ExprKind::Lit(ref lit)) if Self::check_lit(lit, 1) => {
(BinOpKind::Sub, _, &ExprKind::Lit(lit)) if Self::check_lit(lit, 1) => {
Self::generate_recommendation(cx, binop, rhslhs, lhs, Side::Rhs)
},
_ => None,

36
clippy_lints/src/literal_representation.rs
View file

@ -5,11 +5,13 @@ use clippy_utils::diagnostics::span_lint_and_sugg;
use clippy_utils::numeric_literal::{NumericLiteral, Radix};
use clippy_utils::source::snippet_opt;
use if_chain::if_chain;
use rustc_ast::ast::{Expr, ExprKind, Lit, LitKind};
use rustc_ast::ast::{Expr, ExprKind, LitKind};
use rustc_ast::token;
use rustc_errors::Applicability;
use rustc_lint::{EarlyContext, EarlyLintPass, LintContext};
use rustc_middle::lint::in_external_macro;
use rustc_session::{declare_tool_lint, impl_lint_pass};
use rustc_span::Span;
use std::iter;
declare_clippy_lint! {
@ -236,8 +238,8 @@ impl EarlyLintPass for LiteralDigitGrouping {
return;
}
if let ExprKind::Lit(ref lit) = expr.kind {
self.check_lit(cx, lit);
if let ExprKind::Lit(lit) = expr.kind {
self.check_lit(cx, lit, expr.span);
}
}
}
@ -252,12 +254,13 @@ impl LiteralDigitGrouping {
}
}
fn check_lit(self, cx: &EarlyContext<'_>, lit: &Lit) {
fn check_lit(self, cx: &EarlyContext<'_>, lit: token::Lit, span: Span) {
if_chain! {
if let Some(src) = snippet_opt(cx, lit.span);
if let Some(mut num_lit) = NumericLiteral::from_lit(&src, lit);
if let Some(src) = snippet_opt(cx, span);
if let Ok(lit_kind) = LitKind::from_token_lit(lit);
if let Some(mut num_lit) = NumericLiteral::from_lit_kind(&src, &lit_kind);
then {
if !Self::check_for_mistyped_suffix(cx, lit.span, &mut num_lit) {
if !Self::check_for_mistyped_suffix(cx, span, &mut num_lit) {
return;
}
@ -293,14 +296,14 @@ impl LiteralDigitGrouping {
| WarningType::InconsistentDigitGrouping
| WarningType::UnusualByteGroupings
| WarningType::LargeDigitGroups => {
!lit.span.from_expansion()
!span.from_expansion()
}
WarningType::DecimalRepresentation | WarningType::MistypedLiteralSuffix => {
true
}
};
if should_warn {
warning_type.display(num_lit.format(), cx, lit.span);
warning_type.display(num_lit.format(), cx, span);
}
}
}
@ -458,8 +461,8 @@ impl EarlyLintPass for DecimalLiteralRepresentation {
return;
}
if let ExprKind::Lit(ref lit) = expr.kind {
self.check_lit(cx, lit);
if let ExprKind::Lit(lit) = expr.kind {
self.check_lit(cx, lit, expr.span);
}
}
}
@ -469,19 +472,20 @@ impl DecimalLiteralRepresentation {
pub fn new(threshold: u64) -> Self {
Self { threshold }
}
fn check_lit(self, cx: &EarlyContext<'_>, lit: &Lit) {
fn check_lit(self, cx: &EarlyContext<'_>, lit: token::Lit, span: Span) {
// Lint integral literals.
if_chain! {
if let LitKind::Int(val, _) = lit.kind;
if let Some(src) = snippet_opt(cx, lit.span);
if let Some(num_lit) = NumericLiteral::from_lit(&src, lit);
if let Ok(lit_kind) = LitKind::from_token_lit(lit);
if let LitKind::Int(val, _) = lit_kind;
if let Some(src) = snippet_opt(cx, span);
if let Some(num_lit) = NumericLiteral::from_lit_kind(&src, &lit_kind);
if num_lit.radix == Radix::Decimal;
if val >= u128::from(self.threshold);
then {
let hex = format!("{val:#X}");
let num_lit = NumericLiteral::new(&hex, num_lit.suffix, false);
let _ = Self::do_lint(num_lit.integer).map_err(|warning_type| {
warning_type.display(num_lit.format(), cx, lit.span);
warning_type.display(num_lit.format(), cx, span);
});
}
}

8
clippy_lints/src/misc_early/literal_suffix.rs
View file

@ -1,11 +1,11 @@
use clippy_utils::diagnostics::span_lint_and_sugg;
use rustc_ast::ast::Lit;
use rustc_errors::Applicability;
use rustc_lint::EarlyContext;
use rustc_span::Span;
use super::{SEPARATED_LITERAL_SUFFIX, UNSEPARATED_LITERAL_SUFFIX};
pub(super) fn check(cx: &EarlyContext<'_>, lit: &Lit, lit_snip: &str, suffix: &str, sugg_type: &str) {
pub(super) fn check(cx: &EarlyContext<'_>, lit_span: Span, lit_snip: &str, suffix: &str, sugg_type: &str) {
let Some(maybe_last_sep_idx) = lit_snip.len().checked_sub(suffix.len() + 1) else {
return; // It's useless so shouldn't lint.
};
@ -15,7 +15,7 @@ pub(super) fn check(cx: &EarlyContext<'_>, lit: &Lit, lit_snip: &str, suffix: &s
span_lint_and_sugg(
cx,
SEPARATED_LITERAL_SUFFIX,
lit.span,
lit_span,
&format!("{sugg_type} type suffix should not be separated by an underscore"),
"remove the underscore",
format!("{}{suffix}", &lit_snip[..maybe_last_sep_idx]),
@ -25,7 +25,7 @@ pub(super) fn check(cx: &EarlyContext<'_>, lit: &Lit, lit_snip: &str, suffix: &s
span_lint_and_sugg(
cx,
UNSEPARATED_LITERAL_SUFFIX,
lit.span,
lit_span,
&format!("{sugg_type} type suffix should be separated by an underscore"),
"add an underscore",
format!("{}_{suffix}", &lit_snip[..=maybe_last_sep_idx]),

6
clippy_lints/src/misc_early/mixed_case_hex_literals.rs
View file

@ -1,10 +1,10 @@
use clippy_utils::diagnostics::span_lint;
use rustc_ast::ast::Lit;
use rustc_lint::EarlyContext;
use rustc_span::Span;
use super::MIXED_CASE_HEX_LITERALS;
pub(super) fn check(cx: &EarlyContext<'_>, lit: &Lit, suffix: &str, lit_snip: &str) {
pub(super) fn check(cx: &EarlyContext<'_>, lit_span: Span, suffix: &str, lit_snip: &str) {
let Some(maybe_last_sep_idx) = lit_snip.len().checked_sub(suffix.len() + 1) else {
return; // It's useless so shouldn't lint.
};
@ -23,7 +23,7 @@ pub(super) fn check(cx: &EarlyContext<'_>, lit: &Lit, suffix: &str, lit_snip: &s
span_lint(
cx,
MIXED_CASE_HEX_LITERALS,
lit.span,
lit_span,
"inconsistent casing in hexadecimal literal",
);
break;

24
clippy_lints/src/misc_early/mod.rs
View file

@ -9,7 +9,8 @@ mod zero_prefixed_literal;
use clippy_utils::diagnostics::span_lint;
use clippy_utils::source::snippet_opt;
use rustc_ast::ast::{Expr, ExprKind, Generics, Lit, LitFloatType, LitIntType, LitKind, NodeId, Pat, PatKind};
use rustc_ast::ast::{Expr, ExprKind, Generics, LitFloatType, LitIntType, LitKind, NodeId, Pat, PatKind};
use rustc_ast::token;
use rustc_ast::visit::FnKind;
use rustc_data_structures::fx::FxHashMap;
use rustc_lint::{EarlyContext, EarlyLintPass, LintContext};
@ -374,42 +375,43 @@ impl EarlyLintPass for MiscEarlyLints {
return;
}
if let ExprKind::Lit(ref lit) = expr.kind {
MiscEarlyLints::check_lit(cx, lit);
if let ExprKind::Lit(lit) = expr.kind {
MiscEarlyLints::check_lit(cx, lit, expr.span);
}
double_neg::check(cx, expr);
}
}
impl MiscEarlyLints {
fn check_lit(cx: &EarlyContext<'_>, lit: &Lit) {
fn check_lit(cx: &EarlyContext<'_>, lit: token::Lit, span: Span) {
// We test if first character in snippet is a number, because the snippet could be an expansion
// from a built-in macro like `line!()` or a proc-macro like `#[wasm_bindgen]`.
// Note that this check also covers special case that `line!()` is eagerly expanded by compiler.
// See <https://github.com/rust-lang/rust-clippy/issues/4507> for a regression.
// FIXME: Find a better way to detect those cases.
let lit_snip = match snippet_opt(cx, lit.span) {
let lit_snip = match snippet_opt(cx, span) {
Some(snip) if snip.chars().next().map_or(false, |c| c.is_ascii_digit()) => snip,
_ => return,
};
if let LitKind::Int(value, lit_int_type) = lit.kind {
let lit_kind = LitKind::from_token_lit(lit);
if let Ok(LitKind::Int(value, lit_int_type)) = lit_kind {
let suffix = match lit_int_type {
LitIntType::Signed(ty) => ty.name_str(),
LitIntType::Unsigned(ty) => ty.name_str(),
LitIntType::Unsuffixed => "",
};
literal_suffix::check(cx, lit, &lit_snip, suffix, "integer");
literal_suffix::check(cx, span, &lit_snip, suffix, "integer");
if lit_snip.starts_with("0x") {
mixed_case_hex_literals::check(cx, lit, suffix, &lit_snip);
mixed_case_hex_literals::check(cx, span, suffix, &lit_snip);
} else if lit_snip.starts_with("0b") || lit_snip.starts_with("0o") {
// nothing to do
} else if value != 0 && lit_snip.starts_with('0') {
zero_prefixed_literal::check(cx, lit, &lit_snip);
zero_prefixed_literal::check(cx, span, &lit_snip);
}
} else if let LitKind::Float(_, LitFloatType::Suffixed(float_ty)) = lit.kind {
} else if let Ok(LitKind::Float(_, LitFloatType::Suffixed(float_ty))) = lit_kind {
let suffix = float_ty.name_str();
literal_suffix::check(cx, lit, &lit_snip, suffix, "float");
literal_suffix::check(cx, span, &lit_snip, suffix, "float");
}
}
}

10
clippy_lints/src/misc_early/zero_prefixed_literal.rs
View file

@ -1,20 +1,20 @@
use clippy_utils::diagnostics::span_lint_and_then;
use rustc_ast::ast::Lit;
use rustc_errors::Applicability;
use rustc_lint::EarlyContext;
use rustc_span::Span;
use super::ZERO_PREFIXED_LITERAL;
pub(super) fn check(cx: &EarlyContext<'_>, lit: &Lit, lit_snip: &str) {
pub(super) fn check(cx: &EarlyContext<'_>, lit_span: Span, lit_snip: &str) {
let trimmed_lit_snip = lit_snip.trim_start_matches(|c| c == '_' || c == '0');
span_lint_and_then(
cx,
ZERO_PREFIXED_LITERAL,
lit.span,
lit_span,
"this is a decimal constant",
|diag| {
diag.span_suggestion(
lit.span,
lit_span,
"if you mean to use a decimal constant, remove the `0` to avoid confusion",
trimmed_lit_snip.to_string(),
Applicability::MaybeIncorrect,
@ -22,7 +22,7 @@ pub(super) fn check(cx: &EarlyContext<'_>, lit: &Lit, lit_snip: &str) {
// do not advise to use octal form if the literal cannot be expressed in base 8.
if !lit_snip.contains(|c| c == '8' || c == '9') {
diag.span_suggestion(
lit.span,
lit_span,
"if you mean to use an octal constant, use `0o`",
format!("0o{trimmed_lit_snip}"),
Applicability::MaybeIncorrect,

10
clippy_lints/src/octal_escapes.rs
View file

@ -56,11 +56,11 @@ impl EarlyLintPass for OctalEscapes {
return;
}
if let ExprKind::Lit(lit) = &expr.kind {
if matches!(lit.token_lit.kind, LitKind::Str) {
check_lit(cx, &lit.token_lit, lit.span, true);
} else if matches!(lit.token_lit.kind, LitKind::ByteStr) {
check_lit(cx, &lit.token_lit, lit.span, false);
if let ExprKind::Lit(token_lit) = &expr.kind {
if matches!(token_lit.kind, LitKind::Str) {
check_lit(cx, &token_lit, expr.span, true);
} else if matches!(token_lit.kind, LitKind::ByteStr) {
check_lit(cx, &token_lit, expr.span, false);
}
}
}

5
clippy_lints/src/precedence.rs
View file

@ -1,7 +1,8 @@
use clippy_utils::diagnostics::span_lint_and_sugg;
use clippy_utils::source::snippet_with_applicability;
use if_chain::if_chain;
use rustc_ast::ast::{BinOpKind, Expr, ExprKind, LitKind, UnOp};
use rustc_ast::ast::{BinOpKind, Expr, ExprKind, UnOp};
use rustc_ast::token;
use rustc_errors::Applicability;
use rustc_lint::{EarlyContext, EarlyLintPass};
use rustc_session::{declare_lint_pass, declare_tool_lint};
@ -120,7 +121,7 @@ impl EarlyLintPass for Precedence {
if_chain! {
if !all_odd;
if let ExprKind::Lit(lit) = &arg.kind;
if let LitKind::Int(..) | LitKind::Float(..) = &lit.kind;
if let token::LitKind::Integer | token::LitKind::Float = &lit.kind;
then {
let mut applicability = Applicability::MachineApplicable;
span_lint_and_sugg(

18
clippy_lints/src/unused_rounding.rs
View file

@ -1,5 +1,5 @@
use clippy_utils::diagnostics::span_lint_and_sugg;
use rustc_ast::ast::{Expr, ExprKind, LitFloatType, LitKind};
use rustc_ast::ast::{Expr, ExprKind};
use rustc_errors::Applicability;
use rustc_lint::{EarlyContext, EarlyLintPass};
use rustc_session::{declare_lint_pass, declare_tool_lint};
@ -33,14 +33,14 @@ fn is_useless_rounding(expr: &Expr) -> Option<(&str, String)> {
if let ExprKind::MethodCall(name_ident, receiver, _, _) = &expr.kind
&& let method_name = name_ident.ident.name.as_str()
&& (method_name == "ceil" || method_name == "round" || method_name == "floor")
&& let ExprKind::Lit(spanned) = &receiver.kind
&& let LitKind::Float(symbol, ty) = spanned.kind {
let f = symbol.as_str().parse::<f64>().unwrap();
let f_str = symbol.to_string() + if let LitFloatType::Suffixed(ty) = ty {
ty.name_str()
} else {
""
};
&& let ExprKind::Lit(token_lit) = &receiver.kind
&& token_lit.is_semantic_float() {
let f = token_lit.symbol.as_str().parse::<f64>().unwrap();
let mut f_str = token_lit.symbol.to_string();
match token_lit.suffix {
Some(suffix) => f_str.push_str(suffix.as_str()),
None => {}
}
if f.fract() == 0.0 {
Some((method_name, f_str))
} else {

2
clippy_utils/src/ast_utils.rs
View file

@ -152,7 +152,7 @@ pub fn eq_expr(l: &Expr, r: &Expr) -> bool {
},
(Binary(lo, ll, lr), Binary(ro, rl, rr)) => lo.node == ro.node && eq_expr(ll, rl) && eq_expr(lr, rr),
(Unary(lo, l), Unary(ro, r)) => mem::discriminant(lo) == mem::discriminant(ro) && eq_expr(l, r),
(Lit(l), Lit(r)) => l.kind == r.kind,
(Lit(l), Lit(r)) => l == r,
(Cast(l, lt), Cast(r, rt)) | (Type(l, lt), Type(r, rt)) => eq_expr(l, r) && eq_ty(lt, rt),
(Let(lp, le, _), Let(rp, re, _)) => eq_pat(lp, rp) && eq_expr(le, re),
(If(lc, lt, le), If(rc, rt, re)) => eq_expr(lc, rc) && eq_block(lt, rt) && eq_expr_opt(le, re),

6
clippy_utils/src/numeric_literal.rs
View file

@ -1,4 +1,4 @@
use rustc_ast::ast::{Lit, LitFloatType, LitIntType, LitKind};
use rustc_ast::ast::{LitFloatType, LitIntType, LitKind};
use std::iter;
#[derive(Debug, PartialEq, Eq, Copy, Clone)]
@ -46,10 +46,6 @@ pub struct NumericLiteral<'a> {
}
impl<'a> NumericLiteral<'a> {
pub fn from_lit(src: &'a str, lit: &Lit) -> Option<NumericLiteral<'a>> {
NumericLiteral::from_lit_kind(src, &lit.kind)
}
pub fn from_lit_kind(src: &'a str, lit_kind: &LitKind) -> Option<NumericLiteral<'a>> {
let unsigned_src = src.strip_prefix('-').map_or(src, |s| s);
if lit_kind.is_numeric()