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Jon Ross-Perkins
9751b4701d
I think there's more we can do here, but this seemed like a good checkpoint to make sure the path I'm going down is roughly what you expected. There's one actual edit in if expression structure to match the increased enforcement.
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().Pop<SemanticsNodeId>();
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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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