mirror of
https://github.com/carbon-language/carbon-lang.git
synced 2026-09-29 22:02:42 +01:00
Richard Smith
28cefe98df
Previously we did some of this in decl_name_stack and some of it in the callers of decl_name_stack. Factor out a single place to pop a name and its optional following parameters. Part of making this behavior consistent is that we now track whether an implicit parameter list was present or absent rather than mapping an absent list to `InstBlockId::Empty`. This improves our redeclaration checking and the precision of some diagnostics.
88 lines
3.2 KiB
C++
88 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/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_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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PopNameComponentWithoutParams(context, Lex::TokenKind::Export));
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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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