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https://github.com/carbon-language/carbon-lang.git
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Jon Ross-Perkins
57c0a6c076
Starts warning on duplicate "export name" because I'm updating name lookup to make it work. Need to think harder about how to handle cross-package "export import". But adding some failing tests to sketch out what *should* work.
86 lines
3.1 KiB
C++
86 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/check/context.h"
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#include "toolchain/check/decl_name_stack.h"
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#include "toolchain/check/modifiers.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_state_stack().Push(DeclState::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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context.decl_name_stack().PopScope();
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LimitModifiersOnDecl(context, KeywordModifierSet::None,
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Lex::TokenKind::Export);
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context.decl_state_stack().Pop(DeclState::Export);
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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(
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{node_id, SemIR::ExportDecl{.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.enclosing_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);
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it->second = export_id;
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return true;
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}
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} // namespace Carbon::Check
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