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Richard SmithandChandler Carruth
1013d1773c
Start treating function calls as initializing expressions instead of as value expressions. This required adding support for expression categories. Value bindings and temporary materialization conversions are created where necessary to transition between expression categories. For a function call with a return slot, we speculatively create a materialized temporary before the call and either commit to it or replace it with something else later, once we see how the function call expression is actually used. This change follows the direction suggested in #3133 for initializing expressions: depending on the return type of a function, the return value will either be initialized in-place or returned directly. This is visible in the semantics IR, which is a little unfortunate but is probably necessary as this is part of the semantics of the program. --------- Co-authored-by: Chandler Carruth <chandlerc@gmail.com>
122 lines
4.2 KiB
C++
122 lines
4.2 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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namespace Carbon::Check {
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auto HandleStructComma(Context& context, ParseTree::Node /*parse_node*/)
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-> bool {
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context.ParamOrArgComma(
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/*for_args=*/context.parse_tree().node_kind(
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context.node_stack().PeekParseNode()) !=
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ParseNodeKind::StructFieldType);
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return true;
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}
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auto HandleStructFieldDesignator(Context& context,
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ParseTree::Node /*parse_node*/) -> bool {
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// This leaves the designated name on top because the `.` isn't interesting.
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CARBON_CHECK(
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context.parse_tree().node_kind(context.node_stack().PeekParseNode()) ==
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ParseNodeKind::Name);
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return true;
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}
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auto HandleStructFieldType(Context& context, ParseTree::Node parse_node)
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-> bool {
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auto [type_node, type_id] = context.node_stack().PopExpressionWithParseNode();
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SemIR::TypeId cast_type_id = context.ExpressionAsType(type_node, type_id);
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auto [name_node, name_id] =
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context.node_stack().PopWithParseNode<ParseNodeKind::Name>();
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context.AddNodeAndPush(parse_node, SemIR::Node::StructTypeField::Make(
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name_node, name_id, cast_type_id));
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return true;
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}
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auto HandleStructFieldUnknown(Context& context, ParseTree::Node parse_node)
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-> bool {
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return context.TODO(parse_node, "HandleStructFieldUnknown");
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}
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auto HandleStructFieldValue(Context& context, ParseTree::Node parse_node)
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-> bool {
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auto [value_parse_node, value_node_id] =
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context.node_stack().PopExpressionWithParseNode();
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SemIR::StringId name_id = context.node_stack().Pop<ParseNodeKind::Name>();
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// Convert the operand to a value.
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// TODO: We need to decide how struct literals interact with expression
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// categories.
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value_node_id = context.ConvertToValueExpression(value_node_id);
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// Store the name for the type.
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auto type_block_id = context.args_type_info_stack().PeekForAdd();
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context.semantics_ir().AddNode(
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type_block_id,
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SemIR::Node::StructTypeField::Make(
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parse_node, name_id,
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context.semantics_ir().GetNode(value_node_id).type_id()));
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// Push the value back on the stack as an argument.
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context.node_stack().Push(parse_node, value_node_id);
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return true;
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}
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auto HandleStructLiteral(Context& context, ParseTree::Node parse_node) -> bool {
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auto refs_id = context.ParamOrArgEnd(
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/*for_args=*/true, ParseNodeKind::StructLiteralOrStructTypeLiteralStart);
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context.PopScope();
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context.node_stack()
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.PopAndDiscardSoloParseNode<
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ParseNodeKind::StructLiteralOrStructTypeLiteralStart>();
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auto type_block_id = context.args_type_info_stack().Pop();
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auto type_id = context.CanonicalizeStructType(parse_node, type_block_id);
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auto value_id = context.AddNode(
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SemIR::Node::StructValue::Make(parse_node, type_id, refs_id));
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context.node_stack().Push(parse_node, value_id);
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return true;
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}
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auto HandleStructLiteralOrStructTypeLiteralStart(Context& context,
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ParseTree::Node parse_node)
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-> bool {
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context.PushScope();
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context.node_stack().Push(parse_node);
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// At this point we aren't sure whether this will be a value or type literal,
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// so we push onto args irrespective. It just won't be used for a type
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// literal.
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context.args_type_info_stack().Push();
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context.ParamOrArgStart();
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return true;
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}
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auto HandleStructTypeLiteral(Context& context, ParseTree::Node parse_node)
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-> bool {
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auto refs_id = context.ParamOrArgEnd(
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/*for_args=*/false, ParseNodeKind::StructLiteralOrStructTypeLiteralStart);
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context.PopScope();
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context.node_stack()
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.PopAndDiscardSoloParseNode<
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ParseNodeKind::StructLiteralOrStructTypeLiteralStart>();
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// This is only used for value literals.
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context.args_type_info_stack().Pop();
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CARBON_CHECK(refs_id != SemIR::NodeBlockId::Empty)
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<< "{} is handled by StructLiteral.";
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context.AddNodeAndPush(parse_node,
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SemIR::Node::StructType::Make(
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parse_node, SemIR::TypeId::TypeType, refs_id));
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return true;
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}
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} // namespace Carbon::Check
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