use clippy_utils::diagnostics::span_lint_and_sugg;
use clippy_utils::higher::IfLetOrMatch;
use clippy_utils::source::{snippet_with_applicability, snippet_with_context};
-use clippy_utils::ty::{is_type_diagnostic_item, peel_mid_ty_refs_is_mutable};
+use clippy_utils::ty::{is_type_diagnostic_item, peel_mid_ty_refs_is_mutable, type_is_unsafe_function};
use clippy_utils::{
can_move_expr_to_closure, in_constant, is_else_clause, is_lang_ctor, is_lint_allowed, path_to_local_id,
- peel_hir_expr_refs, peel_hir_expr_while, CaptureKind,
+ peel_blocks, peel_hir_expr_refs, peel_hir_expr_while, CaptureKind,
};
use rustc_ast::util::parser::PREC_POSTFIX;
use rustc_errors::Applicability;
use rustc_hir::LangItem::{OptionNone, OptionSome};
use rustc_hir::{
- def::Res, Arm, BindingAnnotation, Block, Expr, ExprKind, HirId, Mutability, Pat, PatKind, Path, QPath,
+ def::Res, Arm, BindingAnnotation, Block, BlockCheckMode, Expr, ExprKind, HirId, Mutability, Pat, PatKind, Path,
+ QPath, UnsafeSource,
};
use rustc_lint::{LateContext, LateLintPass, LintContext};
use rustc_middle::lint::in_external_macro;
declare_lint_pass!(ManualMap => [MANUAL_MAP]);
-impl LateLintPass<'_> for ManualMap {
+impl<'tcx> LateLintPass<'tcx> for ManualMap {
#[allow(clippy::too_many_lines)]
fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
let (scrutinee, then_pat, then_body, else_pat, else_body) = match IfLetOrMatch::parse(cx, expr) {
return;
}
- let some_expr = match get_some_expr(cx, some_expr, expr_ctxt) {
+ let some_expr = match get_some_expr(cx, some_expr, false, expr_ctxt) {
Some(expr) => expr,
None => return,
};
// These two lints will go back and forth with each other.
- if cx.typeck_results().expr_ty(some_expr) == cx.tcx.types.unit
+ if cx.typeck_results().expr_ty(some_expr.expr) == cx.tcx.types.unit
&& !is_lint_allowed(cx, OPTION_MAP_UNIT_FN, expr.hir_id)
{
return;
}
// `map` won't perform any adjustments.
- if !cx.typeck_results().expr_adjustments(some_expr).is_empty() {
+ if !cx.typeck_results().expr_adjustments(some_expr.expr).is_empty() {
return;
}
None => "",
};
- match can_move_expr_to_closure(cx, some_expr) {
+ match can_move_expr_to_closure(cx, some_expr.expr) {
Some(captures) => {
// Check if captures the closure will need conflict with borrows made in the scrutinee.
// TODO: check all the references made in the scrutinee expression. This will require interacting
};
let body_str = if let PatKind::Binding(annotation, id, some_binding, None) = some_pat.kind {
- match can_pass_as_func(cx, id, some_expr) {
- Some(func) if func.span.ctxt() == some_expr.span.ctxt() => {
+ if_chain! {
+ if !some_expr.needs_unsafe_block;
+ if let Some(func) = can_pass_as_func(cx, id, some_expr.expr);
+ if func.span.ctxt() == some_expr.expr.span.ctxt();
+ then {
snippet_with_applicability(cx, func.span, "..", &mut app).into_owned()
- },
- _ => {
- if path_to_local_id(some_expr, id)
+ } else {
+ if path_to_local_id(some_expr.expr, id)
&& !is_lint_allowed(cx, MATCH_AS_REF, expr.hir_id)
&& binding_ref.is_some()
{
} else {
""
};
- format!(
- "|{}{}| {}",
- annotation,
- some_binding,
- snippet_with_context(cx, some_expr.span, expr_ctxt, "..", &mut app).0
- )
- },
+ let expr_snip = snippet_with_context(cx, some_expr.expr.span, expr_ctxt, "..", &mut app).0;
+ if some_expr.needs_unsafe_block {
+ format!("|{}{}| unsafe {{ {} }}", annotation, some_binding, expr_snip)
+ } else {
+ format!("|{}{}| {}", annotation, some_binding, expr_snip)
+ }
+ }
}
} else if !is_wild_none && explicit_ref.is_none() {
// TODO: handle explicit reference annotations.
- format!(
- "|{}| {}",
- snippet_with_context(cx, some_pat.span, expr_ctxt, "..", &mut app).0,
- snippet_with_context(cx, some_expr.span, expr_ctxt, "..", &mut app).0
- )
+ let pat_snip = snippet_with_context(cx, some_pat.span, expr_ctxt, "..", &mut app).0;
+ let expr_snip = snippet_with_context(cx, some_expr.expr.span, expr_ctxt, "..", &mut app).0;
+ if some_expr.needs_unsafe_block {
+ format!("|{}| unsafe {{ {} }}", pat_snip, expr_snip)
+ } else {
+ format!("|{}| {}", pat_snip, expr_snip)
+ }
} else {
// Refutable bindings and mixed reference annotations can't be handled by `map`.
return;
// Checks whether the expression could be passed as a function, or whether a closure is needed.
// Returns the function to be passed to `map` if it exists.
-fn can_pass_as_func(cx: &LateContext<'tcx>, binding: HirId, expr: &'tcx Expr<'_>) -> Option<&'tcx Expr<'tcx>> {
+fn can_pass_as_func<'tcx>(cx: &LateContext<'tcx>, binding: HirId, expr: &'tcx Expr<'_>) -> Option<&'tcx Expr<'tcx>> {
match expr.kind {
ExprKind::Call(func, [arg])
- if path_to_local_id(arg, binding) && cx.typeck_results().expr_adjustments(arg).is_empty() =>
+ if path_to_local_id(arg, binding)
+ && cx.typeck_results().expr_adjustments(arg).is_empty()
+ && !type_is_unsafe_function(cx, cx.typeck_results().expr_ty(func).peel_refs()) =>
{
Some(func)
},
},
}
+struct SomeExpr<'tcx> {
+ expr: &'tcx Expr<'tcx>,
+ needs_unsafe_block: bool,
+}
+
// Try to parse into a recognized `Option` pattern.
// i.e. `_`, `None`, `Some(..)`, or a reference to any of those.
-fn try_parse_pattern(cx: &LateContext<'tcx>, pat: &'tcx Pat<'_>, ctxt: SyntaxContext) -> Option<OptionPat<'tcx>> {
- fn f(cx: &LateContext<'tcx>, pat: &'tcx Pat<'_>, ref_count: usize, ctxt: SyntaxContext) -> Option<OptionPat<'tcx>> {
+fn try_parse_pattern<'tcx>(cx: &LateContext<'tcx>, pat: &'tcx Pat<'_>, ctxt: SyntaxContext) -> Option<OptionPat<'tcx>> {
+ fn f<'tcx>(
+ cx: &LateContext<'tcx>,
+ pat: &'tcx Pat<'_>,
+ ref_count: usize,
+ ctxt: SyntaxContext,
+ ) -> Option<OptionPat<'tcx>> {
match pat.kind {
PatKind::Wild => Some(OptionPat::Wild),
PatKind::Ref(pat, _) => f(cx, pat, ref_count + 1, ctxt),
}
// Checks for an expression wrapped by the `Some` constructor. Returns the contained expression.
-fn get_some_expr(cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>, ctxt: SyntaxContext) -> Option<&'tcx Expr<'tcx>> {
+fn get_some_expr<'tcx>(
+ cx: &LateContext<'tcx>,
+ expr: &'tcx Expr<'_>,
+ needs_unsafe_block: bool,
+ ctxt: SyntaxContext,
+) -> Option<SomeExpr<'tcx>> {
// TODO: Allow more complex expressions.
match expr.kind {
ExprKind::Call(
..
},
[arg],
- ) if ctxt == expr.span.ctxt() && is_lang_ctor(cx, qpath, OptionSome) => Some(arg),
+ ) if ctxt == expr.span.ctxt() && is_lang_ctor(cx, qpath, OptionSome) => Some(SomeExpr {
+ expr: arg,
+ needs_unsafe_block,
+ }),
ExprKind::Block(
Block {
stmts: [],
expr: Some(expr),
+ rules,
..
},
_,
- ) => get_some_expr(cx, expr, ctxt),
+ ) => get_some_expr(
+ cx,
+ expr,
+ needs_unsafe_block || *rules == BlockCheckMode::UnsafeBlock(UnsafeSource::UserProvided),
+ ctxt,
+ ),
_ => None,
}
}
// Checks for the `None` value.
-fn is_none_expr(cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) -> bool {
- match expr.kind {
- ExprKind::Path(ref qpath) => is_lang_ctor(cx, qpath, OptionNone),
- ExprKind::Block(
- Block {
- stmts: [],
- expr: Some(expr),
- ..
- },
- _,
- ) => is_none_expr(cx, expr),
- _ => false,
- }
+fn is_none_expr(cx: &LateContext<'_>, expr: &Expr<'_>) -> bool {
+ matches!(peel_blocks(expr).kind, ExprKind::Path(ref qpath) if is_lang_ctor(cx, qpath, OptionNone))
}
projects / rust.git / blobdiff