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https://github.com/carbon-language/carbon-lang.git
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Jon Ross-Perkins
096daecc57
This doesn't add full support. I'm separating it out to make the effects of the modifier changes clearer for review. I'm restructuring a little with the expectation that we'll have some more categories of modifier keywords in the future (similar to `extern`, these may not be in a "set" such as access), and thus easily scaling up to a few more would be useful.
99 lines
4.0 KiB
C++
99 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_state.h"
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#include "toolchain/lex/token_kind.h"
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namespace Carbon::Check {
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CARBON_DIAGNOSTIC(ModifierPrevious, Note, "`{0}` previously appeared here.",
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Lex::TokenKind);
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static auto EmitRepeatedDiagnostic(Context& context, Parse::NodeId first_node,
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Parse::NodeId second_node) -> void {
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CARBON_DIAGNOSTIC(ModifierRepeated, Error, "`{0}` repeated on declaration.",
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Lex::TokenKind);
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context.emitter()
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.Build(second_node, ModifierRepeated, context.token_kind(second_node))
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.Note(first_node, ModifierPrevious, context.token_kind(first_node))
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.Emit();
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}
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static auto EmitNotAllowedWithDiagnostic(Context& context,
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Parse::NodeId first_node,
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Parse::NodeId second_node) -> void {
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CARBON_DIAGNOSTIC(ModifierNotAllowedWith, Error,
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"`{0}` not allowed on declaration with `{1}`.",
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Lex::TokenKind, Lex::TokenKind);
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context.emitter()
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.Build(second_node, ModifierNotAllowedWith,
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context.token_kind(second_node), context.token_kind(first_node))
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.Note(first_node, ModifierPrevious, context.token_kind(first_node))
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.Emit();
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}
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static auto HandleModifier(Context& context, Parse::NodeId parse_node,
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KeywordModifierSet keyword) -> bool {
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auto& s = context.decl_state_stack().innermost();
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ModifierOrder order;
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KeywordModifierSet later_modifiers;
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if (!!(keyword & KeywordModifierSet::Access)) {
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order = ModifierOrder::Access;
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later_modifiers = KeywordModifierSet::Extern | KeywordModifierSet::Decl;
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} else if (keyword == KeywordModifierSet::Extern) {
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order = ModifierOrder::Extern;
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later_modifiers = KeywordModifierSet::Decl;
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} else {
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order = ModifierOrder::Decl;
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later_modifiers = KeywordModifierSet::None;
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}
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auto current_modifier_node_id = s.modifier_node_id(order);
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if (!!(s.modifier_set & keyword)) {
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EmitRepeatedDiagnostic(context, current_modifier_node_id, parse_node);
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} else if (current_modifier_node_id.is_valid()) {
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EmitNotAllowedWithDiagnostic(context, current_modifier_node_id, parse_node);
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} else if (auto later_modifier_set = s.modifier_set & later_modifiers;
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!!later_modifier_set) {
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// At least one later modifier is present. Diagnose using the closest.
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Parse::NodeId closest_later_modifier = Parse::NodeId::Invalid;
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for (auto later_order = static_cast<int8_t>(order) + 1;
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later_order <= static_cast<int8_t>(ModifierOrder::Last);
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++later_order) {
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if (s.ordered_modifier_node_ids[later_order] != Parse::NodeId::Invalid) {
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closest_later_modifier = s.ordered_modifier_node_ids[later_order];
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break;
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}
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}
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CARBON_CHECK(closest_later_modifier.is_valid());
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CARBON_DIAGNOSTIC(ModifierMustAppearBefore, Error,
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"`{0}` must appear before `{1}`.", Lex::TokenKind,
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Lex::TokenKind);
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context.emitter()
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.Build(parse_node, ModifierMustAppearBefore,
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context.token_kind(parse_node),
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context.token_kind(closest_later_modifier))
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.Note(closest_later_modifier, ModifierPrevious,
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context.token_kind(closest_later_modifier))
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.Emit();
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} else {
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s.modifier_set |= keyword;
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s.set_modifier_node_id(order, parse_node);
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}
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return true;
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}
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#define CARBON_PARSE_NODE_KIND(...)
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#define CARBON_PARSE_NODE_KIND_TOKEN_MODIFIER(Name, ...) \
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auto Handle##Name##Modifier(Context& context, \
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Parse::Name##ModifierId parse_node) -> bool { \
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return HandleModifier(context, parse_node, KeywordModifierSet::Name); \
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}
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#include "toolchain/parse/node_kind.def"
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} // namespace Carbon::Check
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