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https://github.com/carbon-language/carbon-lang.git
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Jon Ross-Perkins
807a3f1370
Adds access to the name lookup table in name scopes. This is so that we can quickly check access during name lookup without resolving the entity itself. Does this for names in general, but does not implement handling for entity-scoped names, only namespace-scoped names (where they're essentially just not exported). Excludes `private` names from exports. Although names should be accessible to `impl` files, that's not implemented here because we'll probably want to do it by directly copying name lookup tables.
73 lines
3.0 KiB
C++
73 lines
3.0 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/check/context.h"
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#include "toolchain/check/decl_introducer_state.h"
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#include "toolchain/check/handle.h"
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#include "toolchain/check/modifiers.h"
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#include "toolchain/check/name_component.h"
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#include "toolchain/sem_ir/ids.h"
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#include "toolchain/sem_ir/inst.h"
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#include "toolchain/sem_ir/name_scope.h"
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namespace Carbon::Check {
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auto HandleNamespaceStart(Context& context, Parse::NamespaceStartId /*node_id*/)
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-> bool {
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// Optional modifiers and the name follow.
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context.decl_introducer_state_stack().Push<Lex::TokenKind::Namespace>();
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context.decl_name_stack().PushScopeAndStartName();
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return true;
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}
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auto HandleNamespace(Context& context, Parse::NamespaceId node_id) -> bool {
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auto name_context = context.decl_name_stack().FinishName(
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PopNameComponentWithoutParams(context, Lex::TokenKind::Namespace));
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auto introducer =
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context.decl_introducer_state_stack().Pop<Lex::TokenKind::Namespace>();
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LimitModifiersOnDecl(context, introducer, KeywordModifierSet::None);
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auto namespace_inst = SemIR::Namespace{
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context.GetBuiltinType(SemIR::BuiltinKind::NamespaceType),
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SemIR::NameScopeId::Invalid, SemIR::InstId::Invalid};
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auto namespace_id =
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context.AddPlaceholderInst(SemIR::LocIdAndInst(node_id, namespace_inst));
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namespace_inst.name_scope_id = context.name_scopes().Add(
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namespace_id, name_context.name_id_for_new_inst(),
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name_context.parent_scope_id_for_new_inst());
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context.ReplaceInstBeforeConstantUse(namespace_id, namespace_inst);
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auto existing_inst_id = context.decl_name_stack().LookupOrAddName(
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name_context, namespace_id, SemIR::AccessKind::Public);
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if (existing_inst_id.is_valid()) {
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// If there's a name conflict with a namespace, "merge" by using the
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// previous declaration. Otherwise, diagnose the issue.
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if (auto existing =
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context.insts().TryGetAs<SemIR::Namespace>(existing_inst_id)) {
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if (context.name_scopes().Get(existing->name_scope_id).is_closed_import) {
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// The existing name is a package name, so this is a name conflict.
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context.DiagnoseDuplicateName(namespace_id, existing_inst_id);
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// Treat this as a local namespace name from now on to avoid further
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// diagnostics.
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context.name_scopes().Get(existing->name_scope_id).is_closed_import =
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false;
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} else if (existing->import_id.is_valid() &&
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!context.insts().GetLocId(existing_inst_id).is_valid()) {
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// When the name conflict is an imported namespace, fill the location ID
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// so that future diagnostics point at this declaration.
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context.SetNamespaceNodeId(existing_inst_id, node_id);
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}
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} else {
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context.DiagnoseDuplicateName(namespace_id, existing_inst_id);
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}
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}
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context.decl_name_stack().PopScope();
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return true;
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}
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} // namespace Carbon::Check
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