mirror of
https://github.com/carbon-language/carbon-lang.git
synced 2026-11-15 21:28:10 +00:00
Richard Smith
fea6cf88fc
Combine the initialization, implicit conversion, and value category conversion functions into a single function. This substantially reduces the duplication between these steps, and ensures that we support the same set of conversions in all these contexts. This also fixes some issues where we would not use the proper value representation for tuples and structs after performing implicit conversions.
94 lines
3.6 KiB
C++
94 lines
3.6 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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// TODO: Find a better home for this. We'll likely need it for more than just
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// expression statements.
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static auto HandleDiscardedExpression(Context& context, SemIR::NodeId expr_id)
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-> void {
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// If we discard an initializing expression, convert it to a value or
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// reference so that it has something to initialize.
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auto expr = context.semantics_ir().GetNode(expr_id);
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Convert(context, expr.parse_node(), expr_id,
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{.kind = ConversionTarget::Discarded, .type_id = expr.type_id()});
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// TODO: This will eventually need to do some "do not discard" analysis.
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}
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auto HandleExpressionStatement(Context& context, Parse::Node /*parse_node*/)
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-> bool {
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HandleDiscardedExpression(context, context.node_stack().PopExpression());
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return true;
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}
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auto HandleReturnStatement(Context& context, Parse::Node parse_node) -> bool {
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CARBON_CHECK(!context.return_scope_stack().empty());
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const auto& fn_node =
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context.semantics_ir().GetNode(context.return_scope_stack().back());
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const auto& callable =
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context.semantics_ir().GetFunction(fn_node.GetAsFunctionDeclaration());
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if (context.parse_tree().node_kind(context.node_stack().PeekParseNode()) ==
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Parse::NodeKind::ReturnStatementStart) {
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context.node_stack()
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.PopAndDiscardSoloParseNode<Parse::NodeKind::ReturnStatementStart>();
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if (callable.return_type_id.is_valid()) {
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// TODO: Add a note pointing at the return type's parse node.
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CARBON_DIAGNOSTIC(ReturnStatementMissingExpression, Error,
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"Must return a {0}.", std::string);
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context.emitter()
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.Build(parse_node, ReturnStatementMissingExpression,
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context.semantics_ir().StringifyType(callable.return_type_id))
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.Emit();
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}
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context.AddNode(SemIR::Node::Return::Make(parse_node));
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} else {
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auto arg = context.node_stack().PopExpression();
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context.node_stack()
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.PopAndDiscardSoloParseNode<Parse::NodeKind::ReturnStatementStart>();
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if (!callable.return_type_id.is_valid()) {
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CARBON_DIAGNOSTIC(
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ReturnStatementDisallowExpression, Error,
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"No return expression should be provided in this context.");
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CARBON_DIAGNOSTIC(ReturnStatementImplicitNote, Note,
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"There was no return type provided.");
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context.emitter()
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.Build(parse_node, ReturnStatementDisallowExpression)
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.Note(fn_node.parse_node(), ReturnStatementImplicitNote)
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.Emit();
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} else if (callable.return_slot_id.is_valid()) {
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arg = Initialize(context, parse_node, callable.return_slot_id, arg);
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} else {
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arg = ConvertToValueOfType(context, parse_node, arg,
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callable.return_type_id);
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}
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context.AddNode(SemIR::Node::ReturnExpression::Make(parse_node, arg));
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}
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// Switch to a new, unreachable, empty node block. This typically won't
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// contain any semantics IR, but it can do if there are statements following
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// the `return` statement.
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context.node_block_stack().Pop();
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context.node_block_stack().PushUnreachable();
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return true;
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}
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auto HandleReturnStatementStart(Context& context, Parse::Node parse_node)
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-> 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::Check
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