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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.
65 lines
2.5 KiB
C++
65 lines
2.5 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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namespace Carbon::Check {
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auto HandleNamespaceStart(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(DeclIntroducerState::Namespace);
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context.decl_name_stack().PushScopeAndStartName();
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return true;
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}
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auto HandleNamespace(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(DeclIntroducerState::Namespace);
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LimitModifiersOnDecl(context, introducer, KeywordModifierSet::None,
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Lex::TokenKind::Namespace);
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auto namespace_inst = SemIR::Namespace{
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context.GetBuiltinType(SemIR::BuiltinKind::NamespaceType),
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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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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_for_new_inst());
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context.ReplaceInstBeforeConstantUse(namespace_id, namespace_inst);
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auto existing_inst_id =
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context.decl_name_stack().LookupOrAddName(name_context, namespace_id);
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if (existing_inst_id.is_valid()) {
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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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if (auto existing =
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context.insts().TryGetAs<SemIR::Namespace>(existing_inst_id)) {
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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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if (existing->import_id.is_valid() &&
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!context.insts().GetLocId(existing_inst_id).is_valid()) {
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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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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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