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From: Thomas Schwinge <tschwinge@gcc.gnu.org> To: gcc-cvs@gcc.gnu.org Subject: [gcc/devel/rust/master] Add catch for recusive type queries Date: Wed, 5 Oct 2022 19:45:19 +0000 (GMT) [thread overview] Message-ID: <20221005194519.CD0443858C2C@sourceware.org> (raw) https://gcc.gnu.org/g:d1069815fa6238712f51a23dfd43d2ae6cd7c5e8 commit d1069815fa6238712f51a23dfd43d2ae6cd7c5e8 Author: Philip Herron <philip.herron@embecosm.com> Date: Fri Sep 30 13:41:09 2022 +0100 Add catch for recusive type queries When we have a type query where by generic substitution occurs we can hit the case where we need to Probe the bounds of the substited item to determine whether the the bounds are compatible this can cause us to end up querying the same type recursively. Fixes #1550 Diff: --- gcc/rust/typecheck/rust-hir-type-check-base.cc | 10 ++++++++++ gcc/rust/typecheck/rust-hir-type-check.h | 12 ++++++++++++ gcc/rust/typecheck/rust-tyty-bounds.cc | 5 +++-- 3 files changed, 25 insertions(+), 2 deletions(-) diff --git a/gcc/rust/typecheck/rust-hir-type-check-base.cc b/gcc/rust/typecheck/rust-hir-type-check-base.cc index bd6a2fb3e73..8107ef5a092 100644 --- a/gcc/rust/typecheck/rust-hir-type-check-base.cc +++ b/gcc/rust/typecheck/rust-hir-type-check-base.cc @@ -495,14 +495,20 @@ TypeCheckBase::resolve_generic_params ( bool TypeCheckBase::query_type (HirId reference, TyTy::BaseType **result) { + if (context->query_in_progress (reference)) + return false; + if (context->lookup_type (reference, result)) return true; + context->insert_query (reference); + HIR::Item *item = mappings->lookup_hir_item (reference); if (item != nullptr) { rust_debug_loc (item->get_locus (), "resolved item {%u} to", reference); *result = TypeCheckItem::Resolve (*item); + context->query_completed (reference); return true; } @@ -520,6 +526,7 @@ TypeCheckBase::query_type (HirId reference, TyTy::BaseType **result) reference); *result = TypeCheckItem::ResolveImplItem (*impl_block, *impl_item); + context->query_completed (reference); return true; } @@ -530,6 +537,7 @@ TypeCheckBase::query_type (HirId reference, TyTy::BaseType **result) if (found_impl_block_type) { *result = TypeCheckItem::ResolveImplBlockSelf (*impl_block_by_type); + context->query_completed (reference); return true; } @@ -544,6 +552,7 @@ TypeCheckBase::query_type (HirId reference, TyTy::BaseType **result) rust_assert (block != nullptr); *result = TypeCheckTopLevelExternItem::Resolve (extern_item, *block); + context->query_completed (reference); return true; } @@ -551,6 +560,7 @@ TypeCheckBase::query_type (HirId reference, TyTy::BaseType **result) Location possible_locus = mappings->lookup_location (reference); rust_debug_loc (possible_locus, "query system failed to resolve: [%u]", reference); + context->query_completed (reference); return false; } diff --git a/gcc/rust/typecheck/rust-hir-type-check.h b/gcc/rust/typecheck/rust-hir-type-check.h index c17db71aec7..f85585bccf6 100644 --- a/gcc/rust/typecheck/rust-hir-type-check.h +++ b/gcc/rust/typecheck/rust-hir-type-check.h @@ -372,6 +372,15 @@ public: return true; } + void insert_query (HirId id) { querys_in_progress.insert (id); } + + void query_completed (HirId id) { querys_in_progress.erase (id); } + + bool query_in_progress (HirId id) const + { + return querys_in_progress.find (id) != querys_in_progress.end (); + } + private: TypeCheckContext (); @@ -406,6 +415,9 @@ private: // predicates std::map<HirId, TyTy::TypeBoundPredicate> predicates; + + // query context lookups + std::set<HirId> querys_in_progress; }; class TypeResolution diff --git a/gcc/rust/typecheck/rust-tyty-bounds.cc b/gcc/rust/typecheck/rust-tyty-bounds.cc index ec4a11fb592..d7647b75f7a 100644 --- a/gcc/rust/typecheck/rust-tyty-bounds.cc +++ b/gcc/rust/typecheck/rust-tyty-bounds.cc @@ -34,8 +34,9 @@ TypeBoundsProbe::scan () if (!impl->has_trait_ref ()) return true; - TyTy::BaseType *impl_type = TypeCheckItem::ResolveImplBlockSelf (*impl); - if (impl_type->get_kind () == TyTy::TypeKind::ERROR) + HirId impl_ty_id = impl->get_type ()->get_mappings ().get_hirid (); + TyTy::BaseType *impl_type = nullptr; + if (!query_type (impl_ty_id, &impl_type)) return true; if (!receiver->can_eq (impl_type, false))
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