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72 lines
2.7 KiB
C++
72 lines
2.7 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/convert.h"
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#include "toolchain/check/modifiers.h"
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#include "toolchain/sem_ir/inst.h"
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namespace Carbon::Check {
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auto HandleLetDecl(Context& context, Parse::NodeId parse_node) -> bool {
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auto value_id = context.node_stack().PopExpr();
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if (context.node_stack().PeekIs<Parse::NodeKind::TuplePattern>()) {
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return context.TODO(parse_node, "tuple pattern in let");
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}
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SemIR::InstId pattern_id =
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context.node_stack().Pop<Parse::NodeKind::BindingPattern>();
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context.node_stack()
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.PopAndDiscardSoloParseNode<Parse::NodeKind::LetIntroducer>();
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// Process declaration modifiers.
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CheckAccessModifiersOnDecl(context, Lex::TokenKind::Let);
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RequireDefaultFinalOnlyInInterfaces(context, Lex::TokenKind::Let);
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LimitModifiersOnDecl(
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context, KeywordModifierSet::Access | KeywordModifierSet::Interface,
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Lex::TokenKind::Let);
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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().saw_access_modifier,
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"access modifier");
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}
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if (!!(modifiers & KeywordModifierSet::Interface)) {
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context.TODO(context.decl_state_stack().innermost().saw_decl_modifier,
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"interface modifier");
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}
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context.decl_state_stack().Pop(DeclState::Let);
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// Convert the value to match the type of the pattern.
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auto pattern = context.insts().Get(pattern_id);
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value_id =
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ConvertToValueOfType(context, parse_node, value_id, pattern.type_id());
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// Update the binding with its value and add it to the current block, after
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// the computation of the value.
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// TODO: Support other kinds of pattern here.
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auto bind_name = pattern.As<SemIR::BindName>();
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CARBON_CHECK(!bind_name.value_id.is_valid())
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<< "Binding should not already have a value!";
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bind_name.value_id = value_id;
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context.insts().Set(pattern_id, bind_name);
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context.inst_block_stack().AddInstId(pattern_id);
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// Add the name of the binding to the current scope.
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context.AddNameToLookup(pattern.parse_node(), bind_name.name_id, pattern_id);
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return true;
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}
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auto HandleLetIntroducer(Context& context, Parse::NodeId parse_node) -> bool {
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context.decl_state_stack().Push(DeclState::Let, parse_node);
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// Push a bracketing node to establish the pattern context.
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context.node_stack().Push(parse_node);
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return true;
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}
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auto HandleLetInitializer(Context& /*context*/, Parse::NodeId /*parse_node*/)
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-> bool {
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return true;
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}
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} // namespace Carbon::Check
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