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Auto merge of #9571 - rust-lang:refactor-lit-ints, r=Jarcho

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use `is_integer_literal` more

I noticed that we have the `is_integer_literal` function in our `clippy_utils`, yet almost everywhere people still match int literal expressions manually. So I searched for instances to replace and shorten the code a bit.

---

changelog: none
This commit is contained in:
bors 2022-10-02 13:11:21 +00:00
commit d6d5ecd625
11 changed files with 52 additions and 122 deletions
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21
clippy_lints/src/bool_to_int_with_if.rs
View file

@ -3,7 +3,7 @@ use rustc_hir::{Block, ExprKind};
use rustc_lint::{LateContext, LateLintPass};
use rustc_session::{declare_lint_pass, declare_tool_lint};
use clippy_utils::{diagnostics::span_lint_and_then, is_else_clause, sugg::Sugg};
use clippy_utils::{diagnostics::span_lint_and_then, is_else_clause, is_integer_literal, sugg::Sugg};
use rustc_errors::Applicability;
declare_clippy_lint! {
@ -56,13 +56,9 @@ fn check_if_else<'tcx>(ctx: &LateContext<'tcx>, expr: &'tcx rustc_hir::Expr<'tcx
&& let Some(then_lit) = int_literal(then)
&& let Some(else_lit) = int_literal(else_)
{
let inverted = if
check_int_literal_equals_val(then_lit, 1)
&& check_int_literal_equals_val(else_lit, 0) {
let inverted = if is_integer_literal(then_lit, 1) && is_integer_literal(else_lit, 0) {
false
} else if
check_int_literal_equals_val(then_lit, 0)
&& check_int_literal_equals_val(else_lit, 1) {
} else if is_integer_literal(then_lit, 0) && is_integer_literal(else_lit, 1) {
true
} else {
// Expression isn't boolean, exit
@ -123,14 +119,3 @@ fn int_literal<'tcx>(expr: &'tcx rustc_hir::Expr<'tcx>) -> Option<&'tcx rustc_hi
None
}
}
fn check_int_literal_equals_val<'tcx>(expr: &'tcx rustc_hir::Expr<'tcx>, expected_value: u128) -> bool {
if let ExprKind::Lit(lit) = &expr.kind
&& let LitKind::Int(val, _) = lit.node
&& val == expected_value
{
true
} else {
false
}
}

14
clippy_lints/src/checked_conversions.rs
View file

@ -2,9 +2,8 @@
use clippy_utils::diagnostics::span_lint_and_sugg;
use clippy_utils::source::snippet_with_applicability;
use clippy_utils::{in_constant, meets_msrv, msrvs, SpanlessEq};
use clippy_utils::{in_constant, is_integer_literal, meets_msrv, msrvs, SpanlessEq};
use if_chain::if_chain;
use rustc_ast::ast::LitKind;
use rustc_errors::Applicability;
use rustc_hir::{BinOp, BinOpKind, Expr, ExprKind, QPath, TyKind};
use rustc_lint::{LateContext, LateLintPass, LintContext};
@ -223,16 +222,7 @@ fn check_lower_bound<'tcx>(expr: &'tcx Expr<'tcx>) -> Option<Conversion<'tcx>> {
/// Check for `expr >= 0`
fn check_lower_bound_zero<'a>(candidate: &'a Expr<'_>, check: &'a Expr<'_>) -> Option<Conversion<'a>> {
if_chain! {
if let ExprKind::Lit(ref lit) = &check.kind;
if let LitKind::Int(0, _) = &lit.node;
then {
Some(Conversion::new_any(candidate))
} else {
None
}
}
is_integer_literal(check, 0).then(|| Conversion::new_any(candidate))
}
/// Check for `expr >= (to_type::MIN as from_type)`

4
clippy_lints/src/from_str_radix_10.rs
View file

@ -1,4 +1,5 @@
use clippy_utils::diagnostics::span_lint_and_sugg;
use clippy_utils::is_integer_literal;
use clippy_utils::sugg::Sugg;
use clippy_utils::ty::is_type_diagnostic_item;
use if_chain::if_chain;
@ -60,8 +61,7 @@ impl<'tcx> LateLintPass<'tcx> for FromStrRadix10 {
if pathseg.ident.name.as_str() == "from_str_radix";
// check if the second argument is a primitive `10`
if let ExprKind::Lit(lit) = &radix.kind;
if let rustc_ast::ast::LitKind::Int(10, _) = lit.node;
if is_integer_literal(radix, 10);
then {
let expr = if let ExprKind::AddrOf(_, _, expr) = &src.kind {

18
clippy_lints/src/implicit_saturating_sub.rs
View file

@ -1,5 +1,5 @@
use clippy_utils::diagnostics::span_lint_and_sugg;
use clippy_utils::{higher, peel_blocks_with_stmt, SpanlessEq};
use clippy_utils::{higher, is_integer_literal, peel_blocks_with_stmt, SpanlessEq};
use if_chain::if_chain;
use rustc_ast::ast::LitKind;
use rustc_errors::Applicability;
@ -131,17 +131,8 @@ impl<'tcx> LateLintPass<'tcx> for ImplicitSaturatingSub {
fn subtracts_one<'a>(cx: &LateContext<'_>, expr: &'a Expr<'a>) -> Option<&'a Expr<'a>> {
match peel_blocks_with_stmt(expr).kind {
ExprKind::AssignOp(ref op1, target, value) => {
if_chain! {
if BinOpKind::Sub == op1.node;
// Check if literal being subtracted is one
if let ExprKind::Lit(ref lit1) = value.kind;
if let LitKind::Int(1, _) = lit1.node;
then {
Some(target)
} else {
None
}
}
// Check if literal being subtracted is one
(BinOpKind::Sub == op1.node && is_integer_literal(value, 1)).then_some(target)
},
ExprKind::Assign(target, value, _) => {
if_chain! {
@ -150,8 +141,7 @@ fn subtracts_one<'a>(cx: &LateContext<'_>, expr: &'a Expr<'a>) -> Option<&'a Exp
if SpanlessEq::new(cx).eq_expr(left1, target);
if let ExprKind::Lit(ref lit1) = right1.kind;
if let LitKind::Int(1, _) = lit1.node;
if is_integer_literal(right1, 1);
then {
Some(target)
} else {

6
clippy_lints/src/methods/get_last_with_len.rs
View file

@ -1,7 +1,6 @@
use clippy_utils::diagnostics::span_lint_and_sugg;
use clippy_utils::source::snippet_with_applicability;
use clippy_utils::SpanlessEq;
use rustc_ast::LitKind;
use clippy_utils::{is_integer_literal, SpanlessEq};
use rustc_errors::Applicability;
use rustc_hir::{BinOpKind, Expr, ExprKind};
use rustc_lint::LateContext;
@ -26,8 +25,7 @@ pub(super) fn check(cx: &LateContext<'_>, expr: &Expr<'_>, recv: &Expr<'_>, arg:
&& lhs_path.ident.name == sym::len
// RHS of subtraction is 1
&& let ExprKind::Lit(rhs_lit) = &rhs.kind
&& let LitKind::Int(1, ..) = rhs_lit.node
&& is_integer_literal(rhs, 1)
// check that recv == lhs_recv `recv.get(lhs_recv.len() - 1)`
&& SpanlessEq::new(cx).eq_expr(recv, lhs_recv)

6
clippy_lints/src/misc.rs
View file

@ -1,7 +1,6 @@
use clippy_utils::diagnostics::{span_lint, span_lint_and_sugg, span_lint_hir_and_then};
use clippy_utils::source::{snippet, snippet_opt};
use if_chain::if_chain;
use rustc_ast::ast::LitKind;
use rustc_errors::Applicability;
use rustc_hir::intravisit::FnKind;
use rustc_hir::{
@ -15,7 +14,7 @@ use rustc_span::hygiene::DesugaringKind;
use rustc_span::source_map::{ExpnKind, Span};
use clippy_utils::sugg::Sugg;
use clippy_utils::{get_parent_expr, in_constant, iter_input_pats, last_path_segment, SpanlessEq};
use clippy_utils::{get_parent_expr, in_constant, is_integer_literal, iter_input_pats, last_path_segment, SpanlessEq};
declare_clippy_lint! {
/// ### What it does
@ -314,8 +313,7 @@ fn non_macro_local(cx: &LateContext<'_>, res: def::Res) -> bool {
fn check_cast(cx: &LateContext<'_>, span: Span, e: &Expr<'_>, ty: &hir::Ty<'_>) {
if_chain! {
if let TyKind::Ptr(ref mut_ty) = ty.kind;
if let ExprKind::Lit(ref lit) = e.kind;
if let LitKind::Int(0, _) = lit.node;
if is_integer_literal(e, 0);
if !in_constant(cx, e.hir_id);
then {
let (msg, sugg_fn) = match mut_ty.mutbl {

28
clippy_lints/src/operators/arithmetic_side_effects.rs
View file

@ -44,25 +44,19 @@ impl ArithmeticSideEffects {
/// Assuming that `expr` is a literal integer, checks operators (+=, -=, *, /) in a
/// non-constant environment that won't overflow.
fn has_valid_op(op: &Spanned<hir::BinOpKind>, expr: &hir::Expr<'_>) -> bool {
if let hir::BinOpKind::Add | hir::BinOpKind::Sub = op.node
&& let hir::ExprKind::Lit(ref lit) = expr.kind
&& let ast::LitKind::Int(0, _) = lit.node
if let hir::ExprKind::Lit(ref lit) = expr.kind &&
let ast::LitKind::Int(value, _) = lit.node
{
return true;
match (&op.node, value) {
(hir::BinOpKind::Add | hir::BinOpKind::Sub, 0) |
(hir::BinOpKind::Mul, 0 | 1) => true,
(hir::BinOpKind::Div | hir::BinOpKind::Rem, 0) => false,
(hir::BinOpKind::Div | hir::BinOpKind::Rem, _) => true,
_ => false,
}
} else {
false
}
if let hir::BinOpKind::Div | hir::BinOpKind::Rem = op.node
&& let hir::ExprKind::Lit(ref lit) = expr.kind
&& !matches!(lit.node, ast::LitKind::Int(0, _))
{
return true;
}
if let hir::BinOpKind::Mul = op.node
&& let hir::ExprKind::Lit(ref lit) = expr.kind
&& let ast::LitKind::Int(0 | 1, _) = lit.node
{
return true;
}
false
}
/// Checks if the given `expr` has any of the inner `allowed` elements.

9
clippy_lints/src/operators/numeric_arithmetic.rs
View file

@ -1,5 +1,6 @@
use clippy_utils::consts::constant_simple;
use clippy_utils::diagnostics::span_lint;
use clippy_utils::is_integer_literal;
use rustc_hir as hir;
use rustc_lint::LateContext;
use rustc_span::source_map::Span;
@ -50,11 +51,9 @@ impl Context {
hir::BinOpKind::Div | hir::BinOpKind::Rem => match &r.kind {
hir::ExprKind::Lit(_lit) => (),
hir::ExprKind::Unary(hir::UnOp::Neg, expr) => {
if let hir::ExprKind::Lit(lit) = &expr.kind {
if let rustc_ast::ast::LitKind::Int(1, _) = lit.node {
span_lint(cx, INTEGER_ARITHMETIC, expr.span, "integer arithmetic detected");
self.expr_id = Some(expr.hir_id);
}
if is_integer_literal(expr, 1) {
span_lint(cx, INTEGER_ARITHMETIC, expr.span, "integer arithmetic detected");
self.expr_id = Some(expr.hir_id);
}
},
_ => {

12
clippy_lints/src/slow_vector_initialization.rs
View file

@ -1,9 +1,10 @@
use clippy_utils::diagnostics::span_lint_and_then;
use clippy_utils::sugg::Sugg;
use clippy_utils::ty::is_type_diagnostic_item;
use clippy_utils::{get_enclosing_block, is_expr_path_def_path, path_to_local, path_to_local_id, paths, SpanlessEq};
use clippy_utils::{
get_enclosing_block, is_expr_path_def_path, is_integer_literal, path_to_local, path_to_local_id, paths, SpanlessEq,
};
use if_chain::if_chain;
use rustc_ast::ast::LitKind;
use rustc_errors::Applicability;
use rustc_hir::intravisit::{walk_block, walk_expr, walk_stmt, Visitor};
use rustc_hir::{BindingAnnotation, Block, Expr, ExprKind, HirId, PatKind, QPath, Stmt, StmtKind};
@ -219,8 +220,7 @@ impl<'a, 'tcx> VectorInitializationVisitor<'a, 'tcx> {
&& path_to_local_id(self_arg, self.vec_alloc.local_id)
&& path.ident.name == sym!(resize)
// Check that is filled with 0
&& let ExprKind::Lit(ref lit) = fill_arg.kind
&& let LitKind::Int(0, _) = lit.node {
&& is_integer_literal(fill_arg, 0) {
// Check that len expression is equals to `with_capacity` expression
if SpanlessEq::new(self.cx).eq_expr(len_arg, self.vec_alloc.len_expr) {
self.slow_expression = Some(InitializationType::Resize(expr));
@ -255,9 +255,7 @@ impl<'a, 'tcx> VectorInitializationVisitor<'a, 'tcx> {
if_chain! {
if let ExprKind::Call(fn_expr, [repeat_arg]) = expr.kind;
if is_expr_path_def_path(self.cx, fn_expr, &paths::ITER_REPEAT);
if let ExprKind::Lit(ref lit) = repeat_arg.kind;
if let LitKind::Int(0, _) = lit.node;
if is_integer_literal(repeat_arg, 0);
then {
true
} else {

41
clippy_lints/src/transmute/transmuting_null.rs
View file

@ -1,8 +1,6 @@
use clippy_utils::consts::{constant_context, Constant};
use clippy_utils::diagnostics::span_lint;
use clippy_utils::is_path_diagnostic_item;
use if_chain::if_chain;
use rustc_ast::LitKind;
use clippy_utils::{is_integer_literal, is_path_diagnostic_item};
use rustc_hir::{Expr, ExprKind};
use rustc_lint::LateContext;
use rustc_middle::ty::Ty;
@ -19,37 +17,28 @@ pub(super) fn check<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>, arg: &'t
// Catching transmute over constants that resolve to `null`.
let mut const_eval_context = constant_context(cx, cx.typeck_results());
if_chain! {
if let ExprKind::Path(ref _qpath) = arg.kind;
if let Some(Constant::RawPtr(x)) = const_eval_context.expr(arg);
if x == 0;
then {
span_lint(cx, TRANSMUTING_NULL, expr.span, LINT_MSG);
return true;
}
if let ExprKind::Path(ref _qpath) = arg.kind &&
let Some(Constant::RawPtr(x)) = const_eval_context.expr(arg) &&
x == 0
{
span_lint(cx, TRANSMUTING_NULL, expr.span, LINT_MSG);
return true;
}
// Catching:
// `std::mem::transmute(0 as *const i32)`
if_chain! {
if let ExprKind::Cast(inner_expr, _cast_ty) = arg.kind;
if let ExprKind::Lit(ref lit) = inner_expr.kind;
if let LitKind::Int(0, _) = lit.node;
then {
span_lint(cx, TRANSMUTING_NULL, expr.span, LINT_MSG);
return true;
}
if let ExprKind::Cast(inner_expr, _cast_ty) = arg.kind && is_integer_literal(inner_expr, 0) {
span_lint(cx, TRANSMUTING_NULL, expr.span, LINT_MSG);
return true;
}
// Catching:
// `std::mem::transmute(std::ptr::null::<i32>())`
if_chain! {
if let ExprKind::Call(func1, []) = arg.kind;
if is_path_diagnostic_item(cx, func1, sym::ptr_null);
then {
span_lint(cx, TRANSMUTING_NULL, expr.span, LINT_MSG);
return true;
}
if let ExprKind::Call(func1, []) = arg.kind &&
is_path_diagnostic_item(cx, func1, sym::ptr_null)
{
span_lint(cx, TRANSMUTING_NULL, expr.span, LINT_MSG);
return true;
}
// FIXME:

15
clippy_lints/src/uninit_vec.rs
View file

@ -1,8 +1,7 @@
use clippy_utils::diagnostics::{span_lint, span_lint_and_then};
use clippy_utils::higher::{get_vec_init_kind, VecInitKind};
use clippy_utils::ty::{is_type_diagnostic_item, is_uninit_value_valid_for_ty};
use clippy_utils::{is_lint_allowed, path_to_local_id, peel_hir_expr_while, SpanlessEq};
use rustc_ast::ast::LitKind;
use clippy_utils::{is_integer_literal, is_lint_allowed, path_to_local_id, peel_hir_expr_while, SpanlessEq};
use rustc_hir::{Block, Expr, ExprKind, HirId, PatKind, PathSegment, Stmt, StmtKind};
use rustc_lint::{LateContext, LateLintPass};
use rustc_middle::lint::in_external_macro;
@ -216,7 +215,7 @@ fn extract_set_len_self<'tcx>(cx: &LateContext<'_>, expr: &'tcx Expr<'_>) -> Opt
let self_type = cx.typeck_results().expr_ty(self_expr).peel_refs();
if is_type_diagnostic_item(cx, self_type, sym::Vec)
&& path.ident.name.as_str() == "set_len"
&& !is_literal_zero(arg)
&& !is_integer_literal(arg, 0)
{
Some((self_expr, expr.span))
} else {
@ -226,13 +225,3 @@ fn extract_set_len_self<'tcx>(cx: &LateContext<'_>, expr: &'tcx Expr<'_>) -> Opt
_ => None,
}
}
fn is_literal_zero(arg: &Expr<'_>) -> bool {
if let ExprKind::Lit(lit) = &arg.kind
&& let LitKind::Int(0, _) = lit.node
{
true
} else {
false
}
}