tests/ui-fulldeps/auxiliary/issue-40001-plugin.rs

   1 #![feature(plugin, rustc_private)]
   2 #![crate_type = "dylib"]
   3
   4 extern crate rustc_ast_pretty;
   5 extern crate rustc_driver;
   6 extern crate rustc_hir;
   7 extern crate rustc_lint;
   8 #[macro_use]
   9 extern crate rustc_session;
  10 extern crate rustc_ast;
  11 extern crate rustc_span;
  12
  13 use rustc_ast_pretty::pprust;
  14 use rustc_driver::plugin::Registry;
  15 use rustc_hir as hir;
  16 use rustc_hir::intravisit;
  17 use rustc_hir::Node;
  18 use rustc_lint::{LateContext, LateLintPass, LintContext};
  19 use rustc_span::source_map;
  20
  21 #[no_mangle]
  22 fn __rustc_plugin_registrar(reg: &mut Registry) {
  23     reg.lint_store.register_lints(&[&MISSING_ALLOWED_ATTR]);
  24     reg.lint_store.register_late_pass(|_| Box::new(MissingAllowedAttrPass));
  25 }
  26
  27 declare_lint! {
  28     MISSING_ALLOWED_ATTR,
  29     Deny,
  30     "Checks for missing `allowed_attr` attribute"
  31 }
  32
  33 declare_lint_pass!(MissingAllowedAttrPass => [MISSING_ALLOWED_ATTR]);
  34
  35 impl<'tcx> LateLintPass<'tcx> for MissingAllowedAttrPass {
  36     fn check_fn(
  37         &mut self,
  38         cx: &LateContext<'tcx>,
  39         _: intravisit::FnKind<'tcx>,
  40         _: &'tcx hir::FnDecl,
  41         _: &'tcx hir::Body,
  42         span: source_map::Span,
  43         id: hir::HirId,
  44     ) {
  45         let item = match cx.tcx.hir().get(id) {
  46             Node::Item(item) => item,
  47             _ => cx.tcx.hir().expect_item(cx.tcx.hir().get_parent_item(id).def_id),
  48         };
  49
  50         let allowed = |attr| pprust::attribute_to_string(attr).contains("allowed_attr");
  51         if !cx.tcx.hir().attrs(item.hir_id()).iter().any(allowed) {
  52             cx.lint(
  53                 MISSING_ALLOWED_ATTR,
  54                 "Missing 'allowed_attr' attribute",
  55                 |lint| lint.set_span(span)
  56             );
  57         }
  58     }
  59 }