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Merge commit '43a1777b89' into clippyup

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This commit is contained in:
flip1995 2020-05-11 20:23:47 +02:00
parent 51158cc71f
commit d13d8987b0
34 changed files with 1573 additions and 256 deletions
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21
clippy_lints/src/unwrap.rs
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@ -1,4 +1,7 @@
use crate::utils::{higher::if_block, is_type_diagnostic_item, span_lint_and_then, usage::is_potentially_mutated};
use crate::utils::{
differing_macro_contexts, higher::if_block, is_type_diagnostic_item, span_lint_and_then,
usage::is_potentially_mutated,
};
use if_chain::if_chain;
use rustc_hir::intravisit::{walk_expr, walk_fn, FnKind, NestedVisitorMap, Visitor};
use rustc_hir::{BinOpKind, Body, Expr, ExprKind, FnDecl, HirId, Path, QPath, UnOp};
@ -73,6 +76,8 @@ struct UnwrapInfo<'tcx> {
ident: &'tcx Path<'tcx>,
/// The check, like `x.is_ok()`
check: &'tcx Expr<'tcx>,
/// The branch where the check takes place, like `if x.is_ok() { .. }`
branch: &'tcx Expr<'tcx>,
/// Whether `is_some()` or `is_ok()` was called (as opposed to `is_err()` or `is_none()`).
safe_to_unwrap: bool,
}
@ -82,19 +87,20 @@ struct UnwrapInfo<'tcx> {
fn collect_unwrap_info<'a, 'tcx>(
cx: &'a LateContext<'a, 'tcx>,
expr: &'tcx Expr<'_>,
branch: &'tcx Expr<'_>,
invert: bool,
) -> Vec<UnwrapInfo<'tcx>> {
if let ExprKind::Binary(op, left, right) = &expr.kind {
match (invert, op.node) {
(false, BinOpKind::And) | (false, BinOpKind::BitAnd) | (true, BinOpKind::Or) | (true, BinOpKind::BitOr) => {
let mut unwrap_info = collect_unwrap_info(cx, left, invert);
unwrap_info.append(&mut collect_unwrap_info(cx, right, invert));
let mut unwrap_info = collect_unwrap_info(cx, left, branch, invert);
unwrap_info.append(&mut collect_unwrap_info(cx, right, branch, invert));
return unwrap_info;
},
_ => (),
}
} else if let ExprKind::Unary(UnOp::UnNot, expr) = &expr.kind {
return collect_unwrap_info(cx, expr, !invert);
return collect_unwrap_info(cx, expr, branch, !invert);
} else {
if_chain! {
if let ExprKind::MethodCall(method_name, _, args) = &expr.kind;
@ -111,7 +117,7 @@ fn collect_unwrap_info<'a, 'tcx>(
_ => unreachable!(),
};
let safe_to_unwrap = unwrappable != invert;
return vec![UnwrapInfo { ident: path, check: expr, safe_to_unwrap }];
return vec![UnwrapInfo { ident: path, check: expr, branch, safe_to_unwrap }];
}
}
}
@ -121,7 +127,7 @@ fn collect_unwrap_info<'a, 'tcx>(
impl<'a, 'tcx> UnwrappableVariablesVisitor<'a, 'tcx> {
fn visit_branch(&mut self, cond: &'tcx Expr<'_>, branch: &'tcx Expr<'_>, else_branch: bool) {
let prev_len = self.unwrappables.len();
for unwrap_info in collect_unwrap_info(self.cx, cond, else_branch) {
for unwrap_info in collect_unwrap_info(self.cx, cond, branch, else_branch) {
if is_potentially_mutated(unwrap_info.ident, cond, self.cx)
|| is_potentially_mutated(unwrap_info.ident, branch, self.cx)
{
@ -158,6 +164,9 @@ impl<'a, 'tcx> Visitor<'tcx> for UnwrappableVariablesVisitor<'a, 'tcx> {
let call_to_unwrap = method_name.ident.name == sym!(unwrap);
if let Some(unwrappable) = self.unwrappables.iter()
.find(|u| u.ident.res == path.res);
// Span contexts should not differ with the conditional branch
if !differing_macro_contexts(unwrappable.branch.span, expr.span);
if !differing_macro_contexts(unwrappable.branch.span, unwrappable.check.span);
then {
if call_to_unwrap == unwrappable.safe_to_unwrap {
span_lint_and_then(