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https://github.com/carbon-language/carbon-lang.git
synced 2026-09-30 14:05:03 +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.
79 lines
3.2 KiB
C++
79 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/modifiers.h"
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#include "toolchain/check/name_component.h"
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#include "toolchain/parse/node_ids.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 HandleAliasIntroducer(Context& context,
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Parse::AliasIntroducerId /*node_id*/) -> bool {
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context.decl_state_stack().Push(DeclState::Alias);
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context.decl_name_stack().PushScopeAndStartName();
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return true;
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}
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auto HandleAliasInitializer(Context& /*context*/,
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Parse::AliasInitializerId /*node_id*/) -> bool {
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return true;
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}
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auto HandleAlias(Context& context, Parse::AliasId /*node_id*/) -> bool {
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auto [expr_node, expr_id] = context.node_stack().PopExprWithNodeId();
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auto name_context = context.decl_name_stack().FinishName(
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PopNameComponentWithoutParams(context, Lex::TokenKind::Alias));
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LimitModifiersOnDecl(context, KeywordModifierSet::Access,
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Lex::TokenKind::Alias);
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auto modifiers = context.decl_state_stack().innermost().modifier_set;
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if (modifiers.HasAnyOf(KeywordModifierSet::Access)) {
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context.TODO(context.decl_state_stack().innermost().modifier_node_id(
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ModifierOrder::Access),
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"access modifier");
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}
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context.decl_state_stack().Pop(DeclState::Alias);
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auto bind_name_id = context.bind_names().Add(
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{.name_id = name_context.name_id_for_new_inst(),
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.enclosing_scope_id = name_context.enclosing_scope_id_for_new_inst(),
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.bind_index = SemIR::CompileTimeBindIndex::Invalid});
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auto alias_id = SemIR::InstId::Invalid;
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if (expr_id.is_builtin()) {
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// Type (`bool`) and value (`false`) literals provided by the builtin
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// structure should be turned into name references.
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// TODO: Look into handling `false`, this doesn't do it right now because it
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// sees a value instruction instead of a builtin.
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alias_id = context.AddInst(
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{name_context.loc_id,
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SemIR::BindAlias{context.insts().Get(expr_id).type_id(), bind_name_id,
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expr_id}});
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} else if (auto inst = context.insts().TryGetAs<SemIR::NameRef>(expr_id)) {
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// Pass through name references, albeit changing the name in use.
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alias_id = context.AddInst(
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{name_context.loc_id,
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SemIR::BindAlias{inst->type_id, bind_name_id, inst->value_id}});
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} else {
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CARBON_DIAGNOSTIC(AliasRequiresNameRef, Error,
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"Alias initializer must be a name reference.");
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context.emitter().Emit(expr_node, AliasRequiresNameRef);
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alias_id =
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context.AddInst({name_context.loc_id,
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SemIR::BindAlias{SemIR::TypeId::Error, bind_name_id,
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SemIR::InstId::BuiltinError}});
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}
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// Add the name of the binding to the current scope.
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context.decl_name_stack().PopScope();
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context.decl_name_stack().AddNameOrDiagnoseDuplicate(name_context, alias_id);
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return true;
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}
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} // namespace Carbon::Check
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