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https://github.com/carbon-language/carbon-lang.git
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Jon Ross-Perkins
a910eda020
With private modifiers, we'll want to start checking modifiers later, e.g. after a name conflict is detected (and potentially merged). I think we've agreed to be more explicit about whether the modifier functions are manipulating state, versus trying to keep the state on the stack a little longer (moving Pop to the end of these functions). Removing FileScope from the stack and renaming it to DeclIntroducerStack to better reflect the usage and behavior. The FileScope mostly reflects an approach that wasn't ultimately adopted.
90 lines
3.3 KiB
C++
90 lines
3.3 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(DeclIntroducerState::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(DeclIntroducerState::Export);
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LimitModifiersOnDecl(context, introducer, KeywordModifierSet::None,
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Lex::TokenKind::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<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);
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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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