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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.
89 lines
3.2 KiB
C++
89 lines
3.2 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_name_stack.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/parse/typed_nodes.h"
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#include "toolchain/sem_ir/ids.h"
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#include "toolchain/sem_ir/typed_insts.h"
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namespace Carbon::Check {
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auto HandleExportIntroducer(Context& context,
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Parse::ExportIntroducerId /*node_id*/) -> bool {
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context.decl_introducer_state_stack().Push<Lex::TokenKind::Export>();
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// TODO: Probably need to update DeclNameStack to restrict to only namespaces.
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context.decl_name_stack().PushScopeAndStartName();
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return true;
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}
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auto HandleExportDecl(Context& context, Parse::ExportDeclId node_id) -> bool {
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auto name_context = context.decl_name_stack().FinishName(
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PopNameComponentWithoutParams(context, Lex::TokenKind::Export));
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context.decl_name_stack().PopScope();
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auto introducer =
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context.decl_introducer_state_stack().Pop<Lex::TokenKind::Export>();
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LimitModifiersOnDecl(context, introducer, KeywordModifierSet::None);
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if (name_context.state == DeclNameStack::NameContext::State::Error) {
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// Should already be diagnosed.
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return true;
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}
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auto inst_id = name_context.prev_inst_id();
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if (!inst_id.is_valid()) {
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context.DiagnoseNameNotFound(node_id, name_context.name_id_for_new_inst());
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return true;
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}
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auto inst = context.insts().Get(inst_id);
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if (inst.Is<SemIR::ExportDecl>()) {
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CARBON_DIAGNOSTIC(ExportRedundant, Warning,
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"`export` matches previous `export`.");
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CARBON_DIAGNOSTIC(ExportPrevious, Note, "Previous `export` here.");
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context.emitter()
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.Build(node_id, ExportRedundant)
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// Use the location of the export itself, not the exported instruction.
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.Note(context.insts().GetLocId(inst_id), ExportPrevious)
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.Emit();
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return true;
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}
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auto import_ref = context.insts().TryGetAs<SemIR::ImportRefLoaded>(inst_id);
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if (!import_ref) {
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CARBON_DIAGNOSTIC(ExportNotImportedEntity, Error,
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"Only imported entities are valid for `export`.");
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CARBON_DIAGNOSTIC(ExportNotImportedEntitySource, Note,
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"Name is declared here.");
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context.emitter()
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.Build(node_id, ExportNotImportedEntity)
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.Note(inst_id, ExportNotImportedEntitySource)
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.Emit();
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return true;
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}
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auto export_id = context.AddInst<SemIR::ExportDecl>(
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node_id, {.type_id = import_ref->type_id,
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.bind_name_id = import_ref->bind_name_id,
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.value_id = inst_id});
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context.AddExport(export_id);
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// Replace the ImportRef in name lookup, both for the above duplicate
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// diagnostic and so that cross-package imports can find it easily.
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auto bind_name = context.bind_names().Get(import_ref->bind_name_id);
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auto& names = context.name_scopes().Get(bind_name.parent_scope_id).names;
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auto it = names.find(bind_name.name_id);
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CARBON_CHECK(it->second.inst_id == inst_id);
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it->second.inst_id = export_id;
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return true;
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}
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} // namespace Carbon::Check
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