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Use util::sugg in TRANSMUTE_PTR_TO_REF

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This commit is contained in:
mcarton
2016-06-29 23:02:15 +02:00
parent 169b63a84a
commit ebf72cb67f
2 changed files with 14 additions and 19 deletions
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clippy_lints/src/transmute.rs
+13 -19
View File
@@ -3,6 +3,7 @@
use rustc::ty;
use rustc::hir::*;
use utils::{match_def_path, paths, snippet_opt, span_lint, span_lint_and_then};
use utils::sugg;
/// **What it does:** This lint checks for transmutes that can't ever be correct on any architecture
///
@@ -148,28 +149,21 @@ fn check_expr(&mut self, cx: &LateContext, e: &Expr) {
from_ty,
to_ty),
|db| {
if let Some(arg) = snippet_opt(cx, args[0].span) {
let (deref, cast) = if to_rty.mutbl == Mutability::MutMutable {
("&mut *", "*mut")
} else {
("&*", "*const")
};
let arg = &sugg::Sugg::hir(cx, &args[0], "..");
let (deref, cast) = if to_rty.mutbl == Mutability::MutMutable {
("&mut *", "*mut")
} else {
("&*", "*const")
};
let sugg = if from_pty.ty == to_rty.ty {
// Put things in parentheses if they are more complex
match args[0].node {
ExprPath(..) | ExprCall(..) | ExprMethodCall(..) | ExprBlock(..) => {
format!("{}{}", deref, arg)
}
_ => format!("{}({})", deref, arg)
}
} else {
format!("{}({} as {} {})", deref, arg, cast, to_rty.ty)
};
let sugg = if from_pty.ty == to_rty.ty {
sugg::make_unop(deref, arg).to_string()
} else {
format!("{}({} as {} {})", deref, arg, cast, to_rty.ty)
};
db.span_suggestion(e.span, "try", sugg);
}
db.span_suggestion(e.span, "try", sugg);
},
),
_ => return,
tests/compile-fail/transmute.rs
+1
View File
@@ -62,6 +62,7 @@ unsafe fn _ptr_to_ref<T, U>(p: *const T, m: *mut T, o: *const U, om: *mut U) {
//~^ ERROR transmute from a pointer type (`*mut T`) to a reference type (`&mut T`)
//~| HELP try
//~| SUGGESTION = &mut *(p as *mut T);
let _ = &mut *(p as *mut T);
let _: &T = std::mem::transmute(o);
//~^ ERROR transmute from a pointer type (`*const U`) to a reference type (`&T`)