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https://github.com/carbon-language/carbon-lang.git
synced 2026-09-29 19:04:59 +01:00
Richard Smith
74d52738ff
A `let` declaration is represented by a `bind_name` node in SemIR: ```carbon-semir %b: i32 = bind_name "b", %a ``` Because `Check` encounters the pattern before it sees the value, we first create the `bind_name` node with an unset value and don't add it to the block. Then, once we've seen and converted the initializer, we update the `bind_name` to have the value and add it to the current block, after the initializer code.
64 lines
2.4 KiB
C++
64 lines
2.4 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/sem_ir/node.h"
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namespace Carbon::Check {
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auto HandleAddress(Context& context, Parse::Node parse_node) -> bool {
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return context.TODO(parse_node, "HandleAddress");
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}
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auto HandleGenericPatternBinding(Context& context, Parse::Node parse_node)
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-> bool {
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return context.TODO(parse_node, "GenericPatternBinding");
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}
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auto HandlePatternBinding(Context& context, Parse::Node parse_node) -> bool {
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auto [type_node, parsed_type_id] =
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context.node_stack().PopExpressionWithParseNode();
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auto cast_type_id = ExpressionAsType(context, type_node, parsed_type_id);
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// Get the name.
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auto [name_node, name_id] =
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context.node_stack().PopWithParseNode<Parse::NodeKind::Name>();
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// Allocate a node of the appropriate kind, linked to the name for error
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// locations.
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// TODO: Each of these cases should create a `BindName` node.
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switch (auto context_parse_node_kind = context.parse_tree().node_kind(
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context.node_stack().PeekParseNode())) {
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case Parse::NodeKind::VariableIntroducer:
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context.AddNodeAndPush(parse_node, SemIR::Node::VarStorage::Make(
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name_node, cast_type_id, name_id));
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break;
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case Parse::NodeKind::ParameterListStart:
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context.AddNodeAndPush(parse_node, SemIR::Node::Parameter::Make(
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name_node, cast_type_id, name_id));
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break;
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case Parse::NodeKind::LetIntroducer:
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// Create the node, but don't add it to a block until after we've formed
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// its initializer.
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// TODO: For general pattern parsing, we'll need to create a block to hold
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// the `let` pattern before we see the initializer.
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context.node_stack().Push(
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parse_node,
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context.semantics_ir().AddNodeInNoBlock(SemIR::Node::BindName::Make(
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name_node, cast_type_id, name_id, SemIR::NodeId::Invalid)));
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break;
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default:
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CARBON_FATAL() << "Found a pattern binding in unexpected context "
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<< context_parse_node_kind;
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}
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return true;
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}
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auto HandleTemplate(Context& context, Parse::Node parse_node) -> bool {
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return context.TODO(parse_node, "HandleTemplate");
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}
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} // namespace Carbon::Check
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