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use rustc::hir;
use rustc::traits;
use rustc::ty::ToPredicate;
use rustc::ty::subst::Subst;
use rustc::infer::InferOk;
use syntax_pos::DUMMY_SP;
use core::DocAccessLevels;
use super::*;
use self::def_ctor::{get_def_from_def_id, get_def_from_node_id};
pub struct BlanketImplFinder<'a, 'tcx: 'a, 'rcx: 'a, 'cstore: 'rcx> {
pub cx: &'a core::DocContext<'a, 'tcx, 'rcx, 'cstore>,
}
impl<'a, 'tcx, 'rcx, 'cstore> BlanketImplFinder <'a, 'tcx, 'rcx, 'cstore> {
pub fn new(cx: &'a core::DocContext<'a, 'tcx, 'rcx, 'cstore>) -> Self {
BlanketImplFinder { cx }
}
pub fn get_with_def_id(&self, def_id: DefId) -> Vec<Item> {
get_def_from_def_id(&self.cx, def_id, &|def_ctor| {
self.get_blanket_impls(def_id, &def_ctor, None)
})
}
pub fn get_with_node_id(&self, id: ast::NodeId, name: String) -> Vec<Item> {
get_def_from_node_id(&self.cx, id, name, &|def_ctor, name| {
let did = self.cx.tcx.hir.local_def_id(id);
self.get_blanket_impls(did, &def_ctor, Some(name))
})
}
pub fn get_blanket_impls<F>(
&self,
def_id: DefId,
def_ctor: &F,
name: Option<String>,
) -> Vec<Item>
where F: Fn(DefId) -> Def {
let mut impls = Vec::new();
if self.cx
.tcx
.get_attrs(def_id)
.lists("doc")
.has_word("hidden")
{
debug!(
"get_blanket_impls(def_id={:?}, def_ctor=...): item has doc('hidden'), \
aborting",
def_id
);
return impls;
}
let ty = self.cx.tcx.type_of(def_id);
let generics = self.cx.tcx.generics_of(def_id);
let real_name = name.clone().map(|name| Ident::from_str(&name));
let param_env = self.cx.tcx.param_env(def_id);
for &trait_def_id in self.cx.all_traits.iter() {
if !self.cx.access_levels.borrow().is_doc_reachable(trait_def_id) ||
self.cx.generated_synthetics
.borrow_mut()
.get(&(def_id, trait_def_id))
.is_some() {
continue
}
self.cx.tcx.for_each_relevant_impl(trait_def_id, ty, |impl_def_id| {
self.cx.tcx.infer_ctxt().enter(|infcx| {
let t_generics = infcx.tcx.generics_of(impl_def_id);
let trait_ref = infcx.tcx.impl_trait_ref(impl_def_id)
.expect("Cannot get impl trait");
match trait_ref.self_ty().sty {
ty::Param(_) => {},
_ => return,
}
let substs = infcx.fresh_substs_for_item(DUMMY_SP, def_id);
let ty = ty.subst(infcx.tcx, substs);
let param_env = param_env.subst(infcx.tcx, substs);
let impl_substs = infcx.fresh_substs_for_item(DUMMY_SP, impl_def_id);
let trait_ref = trait_ref.subst(infcx.tcx, impl_substs);
let cause = traits::ObligationCause::dummy();
let eq_result = infcx.at(&cause, param_env)
.eq(trait_ref.self_ty(), ty);
if let Ok(InferOk { value: (), obligations }) = eq_result {
drop(obligations);
let may_apply = infcx.predicate_may_hold(&traits::Obligation::new(
cause.clone(),
param_env,
trait_ref.to_predicate(),
));
if !may_apply {
return
}
self.cx.generated_synthetics.borrow_mut()
.insert((def_id, trait_def_id));
let trait_ = hir::TraitRef {
path: get_path_for_type(infcx.tcx,
trait_def_id,
hir::def::Def::Trait),
ref_id: ast::DUMMY_NODE_ID,
hir_ref_id: hir::DUMMY_HIR_ID,
};
let provided_trait_methods =
infcx.tcx.provided_trait_methods(trait_def_id)
.into_iter()
.map(|meth| meth.ident.to_string())
.collect();
let ty = self.cx.get_real_ty(def_id, def_ctor, &real_name, generics);
let predicates = infcx.tcx.predicates_of(impl_def_id);
impls.push(Item {
source: infcx.tcx.def_span(impl_def_id).clean(self.cx),
name: None,
attrs: Default::default(),
visibility: None,
def_id: self.cx.next_def_id(impl_def_id.krate),
stability: None,
deprecation: None,
inner: ImplItem(Impl {
unsafety: hir::Unsafety::Normal,
generics: (t_generics, &predicates).clean(self.cx),
provided_trait_methods,
trait_: Some(trait_.clean(self.cx)),
for_: ty.clean(self.cx),
items: infcx.tcx.associated_items(impl_def_id)
.collect::<Vec<_>>()
.clean(self.cx),
polarity: None,
synthetic: false,
blanket_impl: Some(infcx.tcx.type_of(impl_def_id)
.clean(self.cx)),
}),
});
}
});
});
}
impls
}
}