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Jon Ross-Perkins
43065a1257
This adds a distinction between Unused and SoloParseNode, rather than equating the two. This is intended to help identify nodes which are getting pushed but maybe don't need to be. Not totally done because I want to adjust declaration name handling due to a quirk with how it mixes Name with Expression, but almost done. Once that's done the type punning will be completely gone.
61 lines
2.2 KiB
C++
61 lines
2.2 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/semantics/semantics_context.h"
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#include "toolchain/semantics/semantics_node.h"
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namespace Carbon {
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auto SemanticsHandleVariableDeclaration(SemanticsContext& context,
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ParseTree::Node parse_node) -> bool {
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// Handle the optional initializer.
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auto expr_node_id = SemanticsNodeId::Invalid;
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bool has_init =
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context.parse_tree().node_kind(context.node_stack().PeekParseNode()) !=
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ParseNodeKind::PatternBinding;
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if (has_init) {
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expr_node_id = context.node_stack().PopExpression();
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context.node_stack()
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.PopAndDiscardSoloParseNode<ParseNodeKind::VariableInitializer>();
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}
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// Get the storage and add it to name lookup.
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SemanticsNodeId binding_id =
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context.node_stack().Pop<ParseNodeKind::PatternBinding>();
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auto binding = context.semantics_ir().GetNode(binding_id);
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auto [name_id, storage_id] = binding.GetAsBindName();
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context.AddNameToLookup(binding.parse_node(), name_id, storage_id);
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// If there was an initializer, assign it to storage.
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if (has_init) {
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auto cast_value_id = context.ImplicitAsRequired(
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parse_node, expr_node_id,
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context.semantics_ir().GetNode(storage_id).type_id());
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context.AddNode(SemanticsNode::Assign::Make(
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parse_node, context.semantics_ir().GetNode(cast_value_id).type_id(),
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storage_id, cast_value_id));
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}
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context.node_stack()
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.PopAndDiscardSoloParseNode<ParseNodeKind::VariableIntroducer>();
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return true;
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}
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auto SemanticsHandleVariableIntroducer(SemanticsContext& context,
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ParseTree::Node parse_node) -> bool {
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// No action, just a bracketing node.
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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 SemanticsHandleVariableInitializer(SemanticsContext& context,
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ParseTree::Node parse_node) -> bool {
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// No action, just a bracketing node.
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context.node_stack().Push(parse_node);
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return true;
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}
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} // namespace Carbon
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