mirror of
https://github.com/carbon-language/carbon-lang.git
synced 2026-09-24 22:02:23 +01:00
Jon Ross-Perkins
b079acd86f
The purpose of this change is to allow something such as a FunctionDecl instruction to note an imported instruction as the "loc_id". Note that doesn't occur here: this change is already very sweeping in edits. There is no testdata affected, intended to show equivalent behavior. We might want to consolidate NodeId references towards LocationId, but if that's preferred, I'd still like to split it out. A lot of this just piping through LocationId where it's a build error otherwise, enough that imports should be able to start using it for diagnostics. ValueStores are added but still unused -- just flushing out structure for review. Restructuring SemIRLocation is necessary to use LocationId this way. For TokenOnly, it's not getting used in Parse, so I migrated it to Check and it's now specific to SemIRLocation. I also considered making LocationId reference an InstId (which would need to be an ImportRef) instead of an ImportIRInstId. However, that would've required import.cpp to add instructions for decls which are reached during resolution -- we typically don't have an inst ready for use. An extra inst is essentially 16 bytes in InstId's ValueStore + 4 bytes in LocationId's ValueStore, whereas this is 8 bytes per.
76 lines
3.0 KiB
C++
76 lines
3.0 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/modifiers.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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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 & 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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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().AddNameToLookup(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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