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https://github.com/carbon-language/carbon-lang.git
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Richard Smith
19532967fa
This fake generic was used for two reasons: - The declaration name stack assumes that each declaration name is processed within a generic scope. This is important if the name might have generic parameters, which are always parsed even for declarations that disallow them in check. - Out-of-line redeclarations of generic entities produce instructions with symbolic constant values in non-generic scopes. The former case is addressed by pushing a generic each time we start a declaration name, even if we will reject generic parameters later. The latter case is worked around for now by not building a symbolic constant type or value for instructions that appear outside of any generic, and will be addressed more completely by #5310 and follow-ups.
104 lines
4.0 KiB
C++
104 lines
4.0 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_name_stack.h"
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#include "toolchain/check/generic.h"
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#include "toolchain/check/handle.h"
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#include "toolchain/check/inst.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/check/name_lookup.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 HandleParseNode(Context& context, Parse::ExportIntroducerId /*node_id*/)
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-> bool {
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// Export declarations can't be generic, but we might have parsed a generic
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// parameter in their name, so enter a generic scope just in case.
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StartGenericDecl(context);
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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 HandleParseNode(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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DiscardGenericDecl(context);
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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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// Exporting uses the decl name primarily for lookup, so treat poisoning the
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// same as "not found".
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auto inst_id =
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name_context.state == DeclNameStack::NameContext::State::Poisoned
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? SemIR::InstId::None
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: name_context.prev_inst_id();
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if (!inst_id.has_value()) {
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DiagnoseNameNotFound(context, 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 =
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AddInst<SemIR::ExportDecl>(context, node_id,
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{.type_id = import_ref->type_id,
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.entity_name_id = import_ref->entity_name_id,
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.value_id = inst_id});
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context.exports().push_back(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 entity_name = context.entity_names().Get(import_ref->entity_name_id);
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auto& parent_scope = context.name_scopes().Get(entity_name.parent_scope_id);
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auto& scope_result =
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parent_scope.GetEntry(*parent_scope.Lookup(entity_name.name_id)).result;
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CARBON_CHECK(scope_result.target_inst_id() == inst_id);
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scope_result = SemIR::ScopeLookupResult::MakeFound(
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export_id, scope_result.access_kind());
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return true;
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}
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} // namespace Carbon::Check
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