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9c8773da1b
https://github.com/carbon-language/carbon-lang/issues/4622 When using an unqualified name, disallow declaring that name in all scopes that would make it ambiguous in retrospect. Doesn't include support for poisoning in `impl library` (see new test for that with TODO). Implemented by introduce `InstId::PoisonedName` and entries with it to `NameScope`. --------- Co-authored-by: Dana Jansens <danakj@orodu.net> Co-authored-by: Richard Smith <richard@metafoo.co.uk> Co-authored-by: Geoff Romer <gromer@google.com> Co-authored-by: Jon Ross-Perkins <jperkins@google.com> Co-authored-by: josh11b <josh11b@users.noreply.github.com> Co-authored-by: josh11b <15258583+josh11b@users.noreply.github.com> Co-authored-by: Chandler Carruth <chandlerc@gmail.com> Co-authored-by: Carbon Infra Bot <carbon-external-infra@google.com>
94 lines
3.7 KiB
C++
94 lines
3.7 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_introducer_state.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/sem_ir/ids.h"
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#include "toolchain/sem_ir/inst.h"
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#include "toolchain/sem_ir/name_scope.h"
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namespace Carbon::Check {
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auto HandleParseNode(Context& context, Parse::NamespaceStartId /*node_id*/)
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-> bool {
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// Optional modifiers and the name follow.
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context.decl_introducer_state_stack().Push<Lex::TokenKind::Namespace>();
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context.decl_name_stack().PushScopeAndStartName();
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// Push a pattern block to handle parameters of the namespace declaration.
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// TODO: Disallow these in parse, instead of check, so we don't have to do
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// this.
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context.pattern_block_stack().Push();
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return true;
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}
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auto HandleParseNode(Context& context, Parse::NamespaceId node_id) -> bool {
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auto name_context = context.decl_name_stack().FinishName(
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PopNameComponentWithoutParams(context, Lex::TokenKind::Namespace));
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auto introducer =
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context.decl_introducer_state_stack().Pop<Lex::TokenKind::Namespace>();
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LimitModifiersOnDecl(context, introducer, KeywordModifierSet::None);
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auto namespace_inst = SemIR::Namespace{
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context.GetSingletonType(SemIR::NamespaceType::SingletonInstId),
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SemIR::NameScopeId::Invalid, SemIR::InstId::Invalid};
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auto namespace_id =
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context.AddPlaceholderInst(SemIR::LocIdAndInst(node_id, namespace_inst));
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auto existing_inst_id = context.decl_name_stack().LookupOrAddName(
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name_context, namespace_id, SemIR::AccessKind::Public);
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if (existing_inst_id.is_valid()) {
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if (existing_inst_id.is_poisoned()) {
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context.DiagnosePoisonedName(namespace_id);
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} else if (auto existing = context.insts().TryGetAs<SemIR::Namespace>(
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existing_inst_id)) {
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// If there's a name conflict with a namespace, "merge" by using the
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// previous declaration. Otherwise, diagnose the issue.
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// Point at the other namespace.
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namespace_inst.name_scope_id = existing->name_scope_id;
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if (context.name_scopes()
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.Get(existing->name_scope_id)
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.is_closed_import()) {
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// The existing name is a package name, so this is a name conflict.
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context.DiagnoseDuplicateName(namespace_id, existing_inst_id);
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// Treat this as a local namespace name from now on to avoid further
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// diagnostics.
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context.name_scopes()
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.Get(existing->name_scope_id)
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.set_is_closed_import(false);
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} else if (existing->import_id.is_valid() &&
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!context.insts().GetLocId(existing_inst_id).is_valid()) {
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// When the name conflict is an imported namespace, fill the location ID
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// so that future diagnostics point at this declaration.
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context.SetNamespaceNodeId(existing_inst_id, node_id);
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}
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} else {
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context.DiagnoseDuplicateName(namespace_id, existing_inst_id);
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}
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}
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// If we weren't able to merge namespaces, add a new name scope. Note this
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// occurs even for duplicates where we discard the namespace, because we want
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// to produce a valid constant.
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if (!namespace_inst.name_scope_id.is_valid()) {
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namespace_inst.name_scope_id = context.name_scopes().Add(
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namespace_id, name_context.name_id_for_new_inst(),
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name_context.parent_scope_id);
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}
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context.ReplaceInstBeforeConstantUse(namespace_id, namespace_inst);
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context.decl_name_stack().PopScope();
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return true;
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}
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} // namespace Carbon::Check
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