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https://github.com/carbon-language/carbon-lang.git
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josh11b
23c7d7dd99
Builds upon @domisterwoozy 's excellent #3442 . Removes the need to store the first node of a declaration in the declaration state stack.
73 lines
3.0 KiB
C++
73 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/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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bool is_access = !!(keyword & KeywordModifierSet::Access);
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auto& saw_modifier = is_access ? s.saw_access_modifier : s.saw_decl_modifier;
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if (!!(s.modifier_set & keyword)) {
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EmitRepeatedDiagnostic(context, saw_modifier, parse_node);
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} else if (saw_modifier.is_valid()) {
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EmitNotAllowedWithDiagnostic(context, saw_modifier, parse_node);
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} else if (is_access && s.saw_decl_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(s.saw_decl_modifier))
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.Note(s.saw_decl_modifier, ModifierPrevious,
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context.token_kind(s.saw_decl_modifier))
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.Emit();
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} else {
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s.modifier_set |= keyword;
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saw_modifier = 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, Parse::NodeId parse_node) \
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-> 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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