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a6d59d8714
For each derived DomObject impl, we also generate a dummy trait
ShouldNotImplDomObject that is implemented for all T: DomObject.
We then try to implement it for each field type except the first one.
If compilation succeed, this means that field type doesn't implement
DomObject itself otherwise it would break coherence rules.
error[E0119]: conflicting implementations of trait `dom::xmlhttprequest::_IMPL_DOMOBJECT_FOR_XMLHttpRequest::ShouldNotImplDomObject` for type `((), SomeFieldTypeThatShouldNotImplementDomObject)`:
--> /Users/nox/src/servo/components/script/dom/xmlhttprequest.rs:120:1
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120 | #[dom_struct]
| ^^^^^^^^^^^^^
| |
| first implementation here
| conflicting implementation for `((), SomeFieldTypeThatShouldNotImplementDomObject)`
59 lines
2 KiB
Rust
59 lines
2 KiB
Rust
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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//! Servo's compiler plugin/macro crate
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//!
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//! Attributes this crate provides:
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//!
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//! - `#[derive(DenyPublicFields)]` : Forces all fields in a struct/enum to be private
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//! - `#[derive(JSTraceable)]` : Auto-derives an implementation of `JSTraceable` for a struct in the script crate
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//! - `#[must_root]` : Prevents data of the marked type from being used on the stack.
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//! See the lints module for more details
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//! - `#[dom_struct]` : Implies #[derive(JSTraceable, DenyPublicFields)]`, and `#[must_root]`.
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//! Use this for structs that correspond to a DOM type
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#![feature(box_syntax, plugin, plugin_registrar, quote, rustc_private, slice_patterns)]
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#![deny(unsafe_code)]
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#[cfg(feature = "clippy")]
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extern crate clippy_lints;
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#[macro_use]
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extern crate rustc;
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extern crate rustc_plugin;
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extern crate syntax;
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use rustc_plugin::Registry;
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use syntax::ext::base::*;
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use syntax::feature_gate::AttributeType::Whitelisted;
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use syntax::symbol::Symbol;
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// Public for documentation to show up
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/// Handles the auto-deriving for `#[derive(JSTraceable)]`
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pub mod jstraceable;
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pub mod lints;
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/// Utilities for writing plugins
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mod utils;
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#[plugin_registrar]
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pub fn plugin_registrar(reg: &mut Registry) {
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reg.register_syntax_extension(
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Symbol::intern("dom_struct"),
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MultiModifier(box jstraceable::expand_dom_struct));
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reg.register_late_lint_pass(box lints::unrooted_must_root::UnrootedPass::new());
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reg.register_early_lint_pass(box lints::ban::BanPass);
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reg.register_attribute("allow_unrooted_interior".to_string(), Whitelisted);
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reg.register_attribute("must_root".to_string(), Whitelisted);
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register_clippy(reg);
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}
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#[cfg(feature = "clippy")]
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fn register_clippy(reg: &mut Registry) {
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::clippy_lints::register_plugins(reg);
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}
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#[cfg(not(feature = "clippy"))]
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fn register_clippy(_reg: &mut Registry) {
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}
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