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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
use rustc::lint::{Context, LintPass, LintArray};
use syntax::ast;
use utils::match_ty_unwrap;
declare_lint!(BANNED_TYPE, Deny,
"Ban various unsafe type combinations");
/// Lint for banning various unsafe types
///
/// Banned types:
///
/// - `Cell<JSVal>`
/// - `Cell<JS<T>>`
pub struct BanPass;
impl LintPass for BanPass {
fn get_lints(&self) -> LintArray {
lint_array!(BANNED_TYPE)
}
fn check_ty(&mut self, cx: &Context, ty: &ast::Ty) {
if match_ty_unwrap(ty, &["std","cell","Cell"])
.and_then(|t| t.get(0))
.and_then(|t| match_ty_unwrap(&**t, &["dom", "bindings", "js", "JS"]))
.is_some() {
cx.span_lint(BANNED_TYPE, ty.span, "Banned type Cell<JS<T>> detected. Use MutHeap<JS<T>> instead")
}
if match_ty_unwrap(ty, &["std","cell","Cell"])
.and_then(|t| t.get(0))
.and_then(|t| match_ty_unwrap(&**t, &["js", "jsval", "JSVal"]))
.is_some() {
cx.span_lint(BANNED_TYPE, ty.span, "Banned type Cell<JSVal> detected. Use MutHeap<JSVal> instead")
}
}
}
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