mirror of
https://github.com/carbon-language/carbon-lang.git
synced 2026-09-24 22:02:23 +01:00
Dana Jansens
917a6ea971
Currently each interface has a `Self` facet internally that becomes a binding to every entity inside the interface: associated constants, functions, and require decls. Each of these has to be independently generic as a result. This makes is challenging in extended name lookup to move into an extended scope of an interface, as we have a specific for the interface, but the names within require a different specific that includes a `Self` facet value. We generalize this relationship by adding a second generic to Interface, called `generic_with_self`. When we want to work with entities inside the interface, we move from the interface-without-specific to the interface-with-self specific by adding a Self to the specific. This is done independently of any particular entity inside the Interface, as those entities are now all members of the interface-with-self generic. Associated constants no longer need a generic of their own, as they do not have separate generic bindings. Functions retain a generic, but if the function has no generic arguments, it will have no bindings of its own now. Require decls retain a generic so that their specific can be instantiated separately from the interface. Requiring the interface to be complete does not require the types in a require decl to be complete unless it is modified by `extend`. So we allow them to be completed later by keeping them in a separate generic. Named constraints look like interfaces and gain the additional inner generic-with-self, with the same relationship to require decls. This removes the need for name lookup to perform Substitution of a Self facet into the extended scope instruction. Instead, the `SpecificConstant` instruction inserted by a `require` decl is part of the interface-with-self generic. When looking through a FacetType for extended scopes, for each interface, we push the scope with the specific for the interface-with-self. Then the constant value of the `SpecificConstant` is correctly modified by the provided self automatically through applying that specific.
103 lines
3.1 KiB
C++
103 lines
3.1 KiB
C++
// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
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// Exceptions. See /LICENSE for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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#include "toolchain/sem_ir/name_scope.h"
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#include <optional>
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#include <utility>
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#include "toolchain/sem_ir/file.h"
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namespace Carbon::SemIR {
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NameScopeStore::NameScopeStore(const File* file)
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// 1 reserved untagged id because the Package NameScope is used across
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// Files.
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: file_(file), values_(file->check_ir_id(), 1) {}
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auto NameScope::Print(llvm::raw_ostream& out) const -> void {
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out << "{inst: " << inst_id_ << ", parent_scope: " << parent_scope_id_
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<< ", has_error: " << (has_error_ ? "true" : "false");
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out << ", extended_scopes: [";
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llvm::ListSeparator scope_sep;
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for (auto id : extended_scopes_) {
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out << scope_sep << id;
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}
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out << "]";
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out << ", names: {";
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llvm::ListSeparator sep;
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for (auto entry : names_) {
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if (entry.result.is_poisoned()) {
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continue;
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}
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out << sep << entry.name_id << ": " << entry.result.target_inst_id();
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}
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out << "}";
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out << "}";
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}
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auto NameScope::AddRequired(Entry name_entry) -> void {
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CARBON_CHECK(!name_entry.result.is_poisoned(),
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"Cannot add a poisoned name: {0}.", name_entry.name_id);
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auto add_name = [&] {
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EntryId index(names_.size());
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names_.push_back(name_entry);
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return index;
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};
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auto result = name_map_.Insert(name_entry.name_id, add_name);
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if (!result.is_inserted()) {
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// A required name can overwrite poison.
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auto& name = names_[result.value().index];
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CARBON_CHECK(name.result.is_poisoned(), "Failed to add required name: {0}",
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name_entry.name_id);
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name = name_entry;
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}
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}
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auto NameScope::LookupOrAdd(NameId name_id, InstId inst_id,
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AccessKind access_kind)
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-> std::pair<bool, EntryId> {
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auto insert_result = name_map_.Insert(name_id, EntryId(names_.size()));
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if (!insert_result.is_inserted()) {
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return {false, EntryId(insert_result.value())};
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}
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names_.push_back({.name_id = name_id,
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.result = ScopeLookupResult::MakeWrappedLookupResult(
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inst_id, access_kind)});
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return {true, EntryId(names_.size() - 1)};
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}
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auto NameScope::LookupOrPoison(LocId loc_id, NameId name_id)
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-> std::optional<EntryId> {
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if (!name_id.AsIdentifierId().has_value()) {
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return Lookup(name_id);
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}
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auto insert_result = name_map_.Insert(name_id, EntryId(names_.size()));
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if (insert_result.is_inserted()) {
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names_.push_back({.name_id = name_id,
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.result = ScopeLookupResult::MakePoisoned(loc_id)});
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return std::nullopt;
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}
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return insert_result.value();
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}
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auto NameScopeStore::GetInstIfValid(NameScopeId scope_id) const
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-> std::pair<InstId, std::optional<Inst>> {
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if (!scope_id.has_value()) {
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return {InstId::None, std::nullopt};
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}
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auto inst_id = Get(scope_id).inst_id();
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if (!inst_id.has_value()) {
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return {InstId::None, std::nullopt};
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}
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return {inst_id, file_->insts().Get(inst_id)};
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}
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} // namespace Carbon::SemIR
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