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This commit is contained in:
Pyriphlegethon 2015-09-29 13:16:53 +02:00
parent b8cdefb6cf
commit 40e180d8c7
1 changed files with 16 additions and 16 deletions
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32
src/mut_reference.rs
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@ -23,28 +23,28 @@ impl LintPass for UnnecessaryMutPassed {
impl LateLintPass for UnnecessaryMutPassed {
fn check_expr(&mut self, cx: &LateContext, e: &Expr) {
if let &ExprCall(ref fn_expr, ref arguments) = &e.node {
let borrowed_table = cx.tcx.tables.borrow();
let funtion_type = match borrowed_table.node_types.get(&fn_expr.id) {
Some(funtion_type) => funtion_type,
None => unreachable!(), // A function with unknown type is called.
// If this happened the compiler would have aborted the
// compilation long ago.
};
let borrowed_table = cx.tcx.tables.borrow();
let funtion_type = match borrowed_table.node_types.get(&fn_expr.id) {
Some(funtion_type) => funtion_type,
None => unreachable!(), // A function with unknown type is called.
// If this happened the compiler would have aborted the
// compilation long ago.
};
if let TypeVariants::TyBareFn(_, ref b) = funtion_type.sty {
let parameters = b.sig.skip_binder().inputs.clone();
for (argument, parameter) in arguments.iter().zip(parameters.iter()) {
match parameter.sty {
TypeVariants::TyRef(_, TypeAndMut {ty: _, mutbl: MutImmutable}) |
TypeVariants::TyRawPtr(TypeAndMut {ty: _, mutbl: MutImmutable}) => {
if let Expr_::ExprAddrOf(MutMutable, _) = argument.node {
if let ExprPath(_, path) = fn_expr.node.clone() {
span_lint(cx, UNNECESSARY_MUT_PASSED,
TypeVariants::TyRef(_, TypeAndMut {ty: _, mutbl: MutImmutable}) |
TypeVariants::TyRawPtr(TypeAndMut {ty: _, mutbl: MutImmutable}) => {
if let Expr_::ExprAddrOf(MutMutable, _) = argument.node {
if let ExprPath(_, path) = fn_expr.node.clone() {
span_lint(cx, UNNECESSARY_MUT_PASSED,
argument.span, &format!("This argument of the \
function \"{}\" doesn't need to be mutable", path));
}
}
},
_ => {}
}
}
},
_ => {}
}
}
}