mirror of
https://github.com/carbon-language/carbon-lang.git
synced 2026-09-29 13:24:57 +01:00
Richard Smith
69353ed271
Incomplete types may be nested within other types; for example, a tuple type might have an incomplete type as an element. Handle such cases by walking through nested incomplete types when completing a type. This is done non-recursively in case a very complex type is formed. Types are generally no longer completed at the point where they're formed. Instead, we attempt to complete a type when it is used in a context that requires a complete type, and diagnose if the type cannot be completed at that point. This will be necessary for classes, which can become complete after their first use, and helps tease out bugs where a type completeness check is missing.
90 lines
3.5 KiB
C++
90 lines
3.5 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 type_node_copy = type_node;
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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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if (!context.TryToCompleteType(cast_type_id, [&] {
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CARBON_DIAGNOSTIC(IncompleteTypeInVarDeclaration, Error,
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"Variable has incomplete type `{0}`.",
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std::string);
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return context.emitter().Build(
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type_node_copy, IncompleteTypeInVarDeclaration,
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context.semantics_ir().StringifyType(cast_type_id, true));
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})) {
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cast_type_id = SemIR::TypeId::Error;
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}
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context.AddNodeAndPush(
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parse_node, SemIR::VarStorage(name_node, cast_type_id, name_id));
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break;
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case Parse::NodeKind::ParameterListStart:
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// Parameters can have incomplete types in a function declaration, but not
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// in a function definition. We don't know which kind we have here.
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context.AddNodeAndPush(
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parse_node, SemIR::Parameter(name_node, cast_type_id, name_id));
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break;
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case Parse::NodeKind::LetIntroducer:
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if (!context.TryToCompleteType(cast_type_id, [&] {
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CARBON_DIAGNOSTIC(IncompleteTypeInLetDeclaration, Error,
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"`let` binding has incomplete type `{0}`.",
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std::string);
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return context.emitter().Build(
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type_node_copy, IncompleteTypeInLetDeclaration,
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context.semantics_ir().StringifyType(cast_type_id, true));
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})) {
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cast_type_id = SemIR::TypeId::Error;
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}
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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::BindName(
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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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