diff --git a/src/librustdoc/clean/blanket_impl.rs b/src/librustdoc/clean/blanket_impl.rs index 72d4cc7c4659c..8ed6ee014f3fa 100644 --- a/src/librustdoc/clean/blanket_impl.rs +++ b/src/librustdoc/clean/blanket_impl.rs @@ -1,141 +1,130 @@ -use crate::rustc_trait_selection::traits::query::evaluate_obligation::InferCtxtExt; use rustc_hir as hir; use rustc_infer::infer::{DefineOpaqueTypes, InferOk, TyCtxtInferExt}; use rustc_infer::traits; -use rustc_middle::ty::ToPredicate; +use rustc_middle::ty::{self, ToPredicate}; +use rustc_span::def_id::DefId; use rustc_span::DUMMY_SP; +use rustc_trait_selection::traits::query::evaluate_obligation::InferCtxtExt; -use super::*; +use thin_vec::ThinVec; -pub(crate) struct BlanketImplFinder<'a, 'tcx> { - pub(crate) cx: &'a mut core::DocContext<'tcx>, -} +use crate::clean; +use crate::clean::{ + clean_middle_assoc_item, clean_middle_ty, clean_trait_ref_with_bindings, clean_ty_generics, +}; +use crate::core::DocContext; + +#[instrument(level = "debug", skip(cx))] +pub(crate) fn synthesize_blanket_impls( + cx: &mut DocContext<'_>, + item_def_id: DefId, +) -> Vec { + let tcx = cx.tcx; + let ty = tcx.type_of(item_def_id); -impl<'a, 'tcx> BlanketImplFinder<'a, 'tcx> { - pub(crate) fn get_blanket_impls(&mut self, item_def_id: DefId) -> Vec { - let cx = &mut self.cx; - let ty = cx.tcx.type_of(item_def_id); + let mut blanket_impls = Vec::new(); + for trait_def_id in tcx.all_traits() { + if !cx.cache.effective_visibilities.is_reachable(tcx, trait_def_id) + || cx.generated_synthetics.get(&(ty.skip_binder(), trait_def_id)).is_some() + { + continue; + } + // NOTE: doesn't use `for_each_relevant_impl` to avoid looking at anything besides blanket impls + let trait_impls = tcx.trait_impls_of(trait_def_id); + 'blanket_impls: for &impl_def_id in trait_impls.blanket_impls() { + trace!("considering impl `{impl_def_id:?}` for trait `{trait_def_id:?}`"); - trace!("get_blanket_impls({ty:?})"); - let mut impls = Vec::new(); - for trait_def_id in cx.tcx.all_traits() { - if !cx.cache.effective_visibilities.is_reachable(cx.tcx, trait_def_id) - || cx.generated_synthetics.get(&(ty.skip_binder(), trait_def_id)).is_some() - { + let trait_ref = tcx.impl_trait_ref(impl_def_id).unwrap(); + if !matches!(trait_ref.skip_binder().self_ty().kind(), ty::Param(_)) { continue; } - // NOTE: doesn't use `for_each_relevant_impl` to avoid looking at anything besides blanket impls - let trait_impls = cx.tcx.trait_impls_of(trait_def_id); - 'blanket_impls: for &impl_def_id in trait_impls.blanket_impls() { - trace!( - "get_blanket_impls: Considering impl for trait '{:?}' {:?}", - trait_def_id, - impl_def_id - ); - let trait_ref = cx.tcx.impl_trait_ref(impl_def_id).unwrap(); - if !matches!(trait_ref.skip_binder().self_ty().kind(), ty::Param(_)) { - continue; - } - let infcx = cx.tcx.infer_ctxt().build(); - let args = infcx.fresh_args_for_item(DUMMY_SP, item_def_id); - let impl_ty = ty.instantiate(infcx.tcx, args); - let param_env = ty::ParamEnv::empty(); + let infcx = tcx.infer_ctxt().build(); + let args = infcx.fresh_args_for_item(DUMMY_SP, item_def_id); + let impl_ty = ty.instantiate(tcx, args); + let param_env = ty::ParamEnv::empty(); - let impl_args = infcx.fresh_args_for_item(DUMMY_SP, impl_def_id); - let impl_trait_ref = trait_ref.instantiate(infcx.tcx, impl_args); + let impl_args = infcx.fresh_args_for_item(DUMMY_SP, impl_def_id); + let impl_trait_ref = trait_ref.instantiate(tcx, impl_args); - // Require the type the impl is implemented on to match - // our type, and ignore the impl if there was a mismatch. - let Ok(eq_result) = infcx.at(&traits::ObligationCause::dummy(), param_env).eq( - DefineOpaqueTypes::Yes, - impl_trait_ref.self_ty(), - impl_ty, - ) else { - continue; - }; - let InferOk { value: (), obligations } = eq_result; - // FIXME(eddyb) ignoring `obligations` might cause false positives. - drop(obligations); + // Require the type the impl is implemented on to match + // our type, and ignore the impl if there was a mismatch. + let Ok(eq_result) = infcx.at(&traits::ObligationCause::dummy(), param_env).eq( + DefineOpaqueTypes::Yes, + impl_trait_ref.self_ty(), + impl_ty, + ) else { + continue; + }; + let InferOk { value: (), obligations } = eq_result; + // FIXME(eddyb) ignoring `obligations` might cause false positives. + drop(obligations); - trace!( - "invoking predicate_may_hold: param_env={:?}, impl_trait_ref={:?}, impl_ty={:?}", + let predicates = tcx + .predicates_of(impl_def_id) + .instantiate(tcx, impl_args) + .predicates + .into_iter() + .chain(Some(ty::Binder::dummy(impl_trait_ref).to_predicate(tcx))); + for predicate in predicates { + let obligation = traits::Obligation::new( + tcx, + traits::ObligationCause::dummy(), param_env, - impl_trait_ref, - impl_ty + predicate, ); - let predicates = cx - .tcx - .predicates_of(impl_def_id) - .instantiate(cx.tcx, impl_args) - .predicates - .into_iter() - .chain(Some(ty::Binder::dummy(impl_trait_ref).to_predicate(infcx.tcx))); - for predicate in predicates { - debug!("testing predicate {predicate:?}"); - let obligation = traits::Obligation::new( - infcx.tcx, - traits::ObligationCause::dummy(), - param_env, - predicate, - ); - match infcx.evaluate_obligation(&obligation) { - Ok(eval_result) if eval_result.may_apply() => {} - Err(traits::OverflowError::Canonical) => {} - _ => continue 'blanket_impls, - } + match infcx.evaluate_obligation(&obligation) { + Ok(eval_result) if eval_result.may_apply() => {} + Err(traits::OverflowError::Canonical) => {} + _ => continue 'blanket_impls, } - debug!( - "get_blanket_impls: found applicable impl for trait_ref={:?}, ty={:?}", - trait_ref, ty - ); + } + debug!("found applicable impl for trait ref {trait_ref:?}"); - cx.generated_synthetics.insert((ty.skip_binder(), trait_def_id)); + cx.generated_synthetics.insert((ty.skip_binder(), trait_def_id)); - impls.push(Item { - name: None, - attrs: Default::default(), - item_id: ItemId::Blanket { impl_id: impl_def_id, for_: item_def_id }, - kind: Box::new(ImplItem(Box::new(Impl { - unsafety: hir::Unsafety::Normal, - generics: clean_ty_generics( - cx, - cx.tcx.generics_of(impl_def_id), - cx.tcx.explicit_predicates_of(impl_def_id), - ), - // FIXME(eddyb) compute both `trait_` and `for_` from - // the post-inference `trait_ref`, as it's more accurate. - trait_: Some(clean_trait_ref_with_bindings( - cx, - ty::Binder::dummy(trait_ref.instantiate_identity()), - ThinVec::new(), - )), - for_: clean_middle_ty( - ty::Binder::dummy(ty.instantiate_identity()), - cx, - None, - None, - ), - items: cx - .tcx - .associated_items(impl_def_id) - .in_definition_order() - .filter(|item| !item.is_impl_trait_in_trait()) - .map(|item| clean_middle_assoc_item(item, cx)) - .collect::>(), - polarity: ty::ImplPolarity::Positive, - kind: ImplKind::Blanket(Box::new(clean_middle_ty( - ty::Binder::dummy(trait_ref.instantiate_identity().self_ty()), - cx, - None, - None, - ))), - }))), - cfg: None, - inline_stmt_id: None, - }); - } + blanket_impls.push(clean::Item { + name: None, + attrs: Default::default(), + item_id: clean::ItemId::Blanket { impl_id: impl_def_id, for_: item_def_id }, + kind: Box::new(clean::ImplItem(Box::new(clean::Impl { + unsafety: hir::Unsafety::Normal, + generics: clean_ty_generics( + cx, + tcx.generics_of(impl_def_id), + tcx.explicit_predicates_of(impl_def_id), + ), + // FIXME(eddyb) compute both `trait_` and `for_` from + // the post-inference `trait_ref`, as it's more accurate. + trait_: Some(clean_trait_ref_with_bindings( + cx, + ty::Binder::dummy(trait_ref.instantiate_identity()), + ThinVec::new(), + )), + for_: clean_middle_ty( + ty::Binder::dummy(ty.instantiate_identity()), + cx, + None, + None, + ), + items: tcx + .associated_items(impl_def_id) + .in_definition_order() + .filter(|item| !item.is_impl_trait_in_trait()) + .map(|item| clean_middle_assoc_item(item, cx)) + .collect(), + polarity: ty::ImplPolarity::Positive, + kind: clean::ImplKind::Blanket(Box::new(clean_middle_ty( + ty::Binder::dummy(trait_ref.instantiate_identity().self_ty()), + cx, + None, + None, + ))), + }))), + cfg: None, + inline_stmt_id: None, + }); } - - impls } + + blanket_impls } diff --git a/src/librustdoc/clean/mod.rs b/src/librustdoc/clean/mod.rs index bbdfbbd0852c6..12f45fe497972 100644 --- a/src/librustdoc/clean/mod.rs +++ b/src/librustdoc/clean/mod.rs @@ -29,7 +29,7 @@ use rustc_middle::ty::{self, AdtKind, Ty, TyCtxt}; use rustc_middle::{bug, span_bug}; use rustc_span::hygiene::{AstPass, MacroKind}; use rustc_span::symbol::{kw, sym, Ident, Symbol}; -use rustc_span::{self, ExpnKind}; +use rustc_span::ExpnKind; use rustc_trait_selection::traits::wf::object_region_bounds; use std::borrow::Cow; @@ -37,14 +37,14 @@ use std::collections::BTreeMap; use std::mem; use thin_vec::ThinVec; -use crate::core::{self, DocContext}; +use crate::core::DocContext; use crate::formats::item_type::ItemType; use crate::visit_ast::Module as DocModule; use utils::*; pub(crate) use self::types::*; -pub(crate) use self::utils::{get_auto_trait_and_blanket_impls, krate, register_res}; +pub(crate) use self::utils::{krate, register_res, synthesize_auto_trait_and_blanket_impls}; pub(crate) fn clean_doc_module<'tcx>(doc: &DocModule<'tcx>, cx: &mut DocContext<'tcx>) -> Item { let mut items: Vec = vec![]; diff --git a/src/librustdoc/clean/utils.rs b/src/librustdoc/clean/utils.rs index d5e0e83696f3f..dc62fbb5edb55 100644 --- a/src/librustdoc/clean/utils.rs +++ b/src/librustdoc/clean/utils.rs @@ -1,5 +1,5 @@ use crate::clean::auto_trait::synthesize_auto_trait_impls; -use crate::clean::blanket_impl::BlanketImplFinder; +use crate::clean::blanket_impl::synthesize_blanket_impls; use crate::clean::render_macro_matchers::render_macro_matcher; use crate::clean::{ clean_doc_module, clean_middle_const, clean_middle_region, clean_middle_ty, inline, Crate, @@ -477,8 +477,7 @@ pub(crate) fn resolve_type(cx: &mut DocContext<'_>, path: Path) -> Type { } } -// FIXME(fmease): Update the `get_*` terminology to the `synthesize_` one. -pub(crate) fn get_auto_trait_and_blanket_impls( +pub(crate) fn synthesize_auto_trait_and_blanket_impls( cx: &mut DocContext<'_>, item_def_id: DefId, ) -> impl Iterator { @@ -490,8 +489,8 @@ pub(crate) fn get_auto_trait_and_blanket_impls( let blanket_impls = cx .sess() .prof - .generic_activity("get_blanket_impls") - .run(|| BlanketImplFinder { cx }.get_blanket_impls(item_def_id)); + .generic_activity("synthesize_blanket_impls") + .run(|| synthesize_blanket_impls(cx, item_def_id)); auto_impls.into_iter().chain(blanket_impls) } diff --git a/src/librustdoc/passes/collect_trait_impls.rs b/src/librustdoc/passes/collect_trait_impls.rs index fbbb6152cfe79..c92cf9d3e80d3 100644 --- a/src/librustdoc/passes/collect_trait_impls.rs +++ b/src/librustdoc/passes/collect_trait_impls.rs @@ -122,7 +122,7 @@ pub(crate) fn collect_trait_impls(mut krate: Crate, cx: &mut DocContext<'_>) -> _ => true, } }) { - let impls = get_auto_trait_and_blanket_impls(cx, def_id); + let impls = synthesize_auto_trait_and_blanket_impls(cx, def_id); new_items_external.extend(impls.filter(|i| cx.inlined.insert(i.item_id))); } } @@ -230,8 +230,10 @@ impl<'a, 'tcx> DocVisitor for SyntheticImplCollector<'a, 'tcx> { if i.is_struct() || i.is_enum() || i.is_union() { // FIXME(eddyb) is this `doc(hidden)` check needed? if !self.cx.tcx.is_doc_hidden(i.item_id.expect_def_id()) { - self.impls - .extend(get_auto_trait_and_blanket_impls(self.cx, i.item_id.expect_def_id())); + self.impls.extend(synthesize_auto_trait_and_blanket_impls( + self.cx, + i.item_id.expect_def_id(), + )); } }