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carbon-lang/toolchain/check/impl.cpp
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Dana Jansens fbcaf34494 Defer RequireCompleteType to impl definition (Refactor Impl construction 7/7) (#6470) 
Explicitly run `RequireCompleteType` for an impl's facet type constraint
in two places:
- For a new `Impl` declaration that is `extend`
- At the start of the `Impl` definition

Stop trying to RequireCompleteType in the definition when constructing
the witness. If we have a rewrite of a name in `.Self`, then we can
construct a full witness, otherwise we defer to the definition.

Now GetOrAddImpl does not need to track `is_definition` anymore, so we
remove a lot of plumbing.

We inline the `AllocateFacetTypeImplWitness` since it has a single
caller and it is just 2 lines, to help improve understanding of the
steps and comments in setting up the impl definition.

Note that this puts the `RequreCompleteType` instruction into the
definition's generic eval block always, avoiding the issue of ensuring
that each generic redecl has the exact same instructions, and forcing
coordination to have `RequireCompleteType` inserted into every
declaration's eval block or none. The result also more closely matches
the design, with the complete type not being required until inside the
definition.

This is part of #6420 which is being split up into a chain of smaller
PRs. It is based on #6469.
2025-12-11 23:50:10 +00:00

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// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
// Exceptions. See /LICENSE for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
#include "toolchain/check/impl.h"
#include "toolchain/base/kind_switch.h"
#include "toolchain/check/context.h"
#include "toolchain/check/deduce.h"
#include "toolchain/check/eval.h"
#include "toolchain/check/facet_type.h"
#include "toolchain/check/function.h"
#include "toolchain/check/generic.h"
#include "toolchain/check/import_ref.h"
#include "toolchain/check/inst.h"
#include "toolchain/check/interface.h"
#include "toolchain/check/merge.h"
#include "toolchain/check/name_lookup.h"
#include "toolchain/check/name_scope.h"
#include "toolchain/check/thunk.h"
#include "toolchain/check/type.h"
#include "toolchain/check/type_completion.h"
#include "toolchain/check/type_structure.h"
#include "toolchain/diagnostics/diagnostic_emitter.h"
#include "toolchain/sem_ir/generic.h"
#include "toolchain/sem_ir/ids.h"
#include "toolchain/sem_ir/impl.h"
#include "toolchain/sem_ir/inst.h"
#include "toolchain/sem_ir/typed_insts.h"
namespace Carbon::Check {
// Adds the location of the associated function to a diagnostic.
static auto NoteAssociatedFunction(Context& context, DiagnosticBuilder& builder,
SemIR::FunctionId function_id) -> void {
CARBON_DIAGNOSTIC(AssociatedFunctionHere, Note,
"associated function {0} declared here", SemIR::NameId);
const auto& function = context.functions().Get(function_id);
builder.Note(function.latest_decl_id(), AssociatedFunctionHere,
function.name_id);
}
auto CheckAssociatedFunctionImplementation(
Context& context, SemIR::FunctionType interface_function_type,
SemIR::InstId impl_decl_id, SemIR::TypeId self_type_id,
SemIR::InstId witness_inst_id, bool defer_thunk_definition)
-> SemIR::InstId {
auto impl_function_decl =
context.insts().TryGetAs<SemIR::FunctionDecl>(impl_decl_id);
if (!impl_function_decl) {
if (impl_decl_id != SemIR::ErrorInst::InstId) {
CARBON_DIAGNOSTIC(ImplFunctionWithNonFunction, Error,
"associated function {0} implemented by non-function",
SemIR::NameId);
auto builder = context.emitter().Build(
impl_decl_id, ImplFunctionWithNonFunction,
context.functions().Get(interface_function_type.function_id).name_id);
NoteAssociatedFunction(context, builder,
interface_function_type.function_id);
builder.Emit();
}
return SemIR::ErrorInst::InstId;
}
auto impl_enclosing_specific_id =
context.types()
.GetAs<SemIR::FunctionType>(impl_function_decl->type_id)
.specific_id;
// Map from the specific for the function type to the specific for the
// function signature. The function signature may have additional generic
// parameters.
auto interface_function_specific_id =
GetSelfSpecificForInterfaceMemberWithSelfType(
context, SemIR::LocId(impl_decl_id),
interface_function_type.specific_id,
context.functions()
.Get(interface_function_type.function_id)
.generic_id,
impl_enclosing_specific_id, self_type_id, witness_inst_id);
return BuildThunk(context, interface_function_type.function_id,
interface_function_specific_id, impl_decl_id,
defer_thunk_definition);
}
// Builds an initial witness from the rewrites in the facet type, if any.
auto ImplWitnessForDeclaration(Context& context, const SemIR::Impl& impl)
-> SemIR::InstId {
CARBON_CHECK(!impl.has_definition_started());
auto self_type_id = context.types().GetTypeIdForTypeInstId(impl.self_id);
if (self_type_id == SemIR::ErrorInst::TypeId) {
// When 'impl as' is invalid, the self type is an error.
return SemIR::ErrorInst::InstId;
}
return InitialFacetTypeImplWitness(
context, SemIR::LocId(impl.latest_decl_id()), impl.constraint_id,
impl.self_id, impl.interface,
context.generics().GetSelfSpecific(impl.generic_id));
}
auto ImplWitnessStartDefinition(Context& context, SemIR::Impl& impl) -> void {
CARBON_CHECK(impl.is_being_defined());
CARBON_CHECK(impl.witness_id.has_value());
if (impl.witness_id == SemIR::ErrorInst::InstId) {
return;
}
if (!RequireCompleteType(
context, context.types().GetTypeIdForTypeInstId(impl.constraint_id),
SemIR::LocId(impl.constraint_id), [&] {
CARBON_DIAGNOSTIC(ImplAsIncompleteFacetTypeDefinition, Error,
"definition of impl as incomplete facet type {0}",
InstIdAsType);
return context.emitter().Build(SemIR::LocId(impl.latest_decl_id()),
ImplAsIncompleteFacetTypeDefinition,
impl.constraint_id);
})) {
FillImplWitnessWithErrors(context, impl);
return;
}
const auto& interface = context.interfaces().Get(impl.interface.interface_id);
auto assoc_entities =
context.inst_blocks().Get(interface.associated_entities_id);
for (auto decl_id : assoc_entities) {
LoadImportRef(context, decl_id);
}
auto witness = context.insts().GetAs<SemIR::ImplWitness>(impl.witness_id);
auto witness_table =
context.insts().GetAs<SemIR::ImplWitnessTable>(witness.witness_table_id);
auto witness_block =
context.inst_blocks().GetMutable(witness_table.elements_id);
// The impl declaration may have created a placeholder witness table, or a
// full witness table. We can detect that the witness table is a placeholder
// table if it's not the `Empty` id, but it is empty still. If it was a
// placeholder, we can replace the placeholder here with a table of the proper
// size, since the interface must be complete for the impl definition.
bool witness_table_is_placeholder =
witness_table.elements_id != SemIR::InstBlockId::Empty &&
witness_block.empty();
if (witness_table_is_placeholder) {
// TODO: Since our `empty_table` repeats the same value throughout, we could
// skip an allocation here if there was a `ReplacePlaceholder` function that
// took a size and value instead of an array of values.
llvm::SmallVector<SemIR::InstId> empty_table(
assoc_entities.size(), SemIR::InstId::ImplWitnessTablePlaceholder);
context.inst_blocks().ReplacePlaceholder(witness_table.elements_id,
empty_table);
witness_block = context.inst_blocks().GetMutable(witness_table.elements_id);
}
// Check we have a value for all non-function associated constants in the
// witness.
for (auto [assoc_entity, witness_value] :
llvm::zip_equal(assoc_entities, witness_block)) {
auto decl_id = context.constant_values().GetConstantInstId(assoc_entity);
CARBON_CHECK(decl_id.has_value(), "Non-constant associated entity");
if (auto decl =
context.insts().TryGetAs<SemIR::AssociatedConstantDecl>(decl_id)) {
if (witness_value == SemIR::InstId::ImplWitnessTablePlaceholder) {
CARBON_DIAGNOSTIC(ImplAssociatedConstantNeedsValue, Error,
"associated constant {0} not given a value in impl "
"of interface {1}",
SemIR::NameId, SemIR::NameId);
CARBON_DIAGNOSTIC(AssociatedConstantHere, Note,
"associated constant declared here");
context.emitter()
.Build(impl.definition_id, ImplAssociatedConstantNeedsValue,
context.associated_constants()
.Get(decl->assoc_const_id)
.name_id,
interface.name_id)
.Note(assoc_entity, AssociatedConstantHere)
.Emit();
witness_value = SemIR::ErrorInst::InstId;
}
}
}
}
// Adds functions to the witness that the specified impl implements the given
// interface.
auto FinishImplWitness(Context& context, SemIR::ImplId impl_id) -> void {
const auto& impl = context.impls().Get(impl_id);
CARBON_CHECK(impl.is_being_defined());
CARBON_CHECK(impl.witness_id.has_value());
if (impl.witness_id == SemIR::ErrorInst::InstId) {
return;
}
auto witness = context.insts().GetAs<SemIR::ImplWitness>(impl.witness_id);
auto witness_table =
context.insts().GetAs<SemIR::ImplWitnessTable>(witness.witness_table_id);
auto witness_block =
context.inst_blocks().GetMutable(witness_table.elements_id);
auto& impl_scope = context.name_scopes().Get(impl.scope_id);
auto self_type_id = context.types().GetTypeIdForTypeInstId(impl.self_id);
const auto& interface = context.interfaces().Get(impl.interface.interface_id);
auto assoc_entities =
context.inst_blocks().Get(interface.associated_entities_id);
llvm::SmallVector<SemIR::InstId> used_decl_ids;
for (auto [assoc_entity, witness_value] :
llvm::zip_equal(assoc_entities, witness_block)) {
auto decl_id =
context.constant_values().GetInstId(SemIR::GetConstantValueInSpecific(
context.sem_ir(), impl.interface.specific_id, assoc_entity));
CARBON_CHECK(decl_id.has_value(), "Non-constant associated entity");
auto decl = context.insts().Get(decl_id);
CARBON_KIND_SWITCH(decl) {
case CARBON_KIND(SemIR::StructValue struct_value): {
if (struct_value.type_id == SemIR::ErrorInst::TypeId) {
witness_value = SemIR::ErrorInst::InstId;
break;
}
auto type_inst = context.types().GetAsInst(struct_value.type_id);
auto fn_type = type_inst.TryAs<SemIR::FunctionType>();
if (!fn_type) {
CARBON_FATAL("Unexpected type: {0}", type_inst);
}
auto& fn = context.functions().Get(fn_type->function_id);
auto lookup_result =
LookupNameInExactScope(context, SemIR::LocId(decl_id), fn.name_id,
impl.scope_id, impl_scope);
if (lookup_result.is_found()) {
used_decl_ids.push_back(lookup_result.target_inst_id());
witness_value = CheckAssociatedFunctionImplementation(
context, *fn_type, lookup_result.target_inst_id(), self_type_id,
impl.witness_id, /*defer_thunk_definition=*/true);
} else {
CARBON_DIAGNOSTIC(
ImplMissingFunction, Error,
"missing implementation of {0} in impl of interface {1}",
SemIR::NameId, SemIR::NameId);
auto builder =
context.emitter().Build(impl.definition_id, ImplMissingFunction,
fn.name_id, interface.name_id);
NoteAssociatedFunction(context, builder, fn_type->function_id);
builder.Emit();
witness_value = SemIR::ErrorInst::InstId;
}
break;
}
case SemIR::AssociatedConstantDecl::Kind: {
// These are set to their final values already.
break;
}
default:
CARBON_CHECK(decl_id == SemIR::ErrorInst::InstId,
"Unexpected kind of associated entity {0}", decl);
witness_value = SemIR::ErrorInst::InstId;
break;
}
}
// TODO: Diagnose if any declarations in the impl are not in used_decl_ids.
}
auto FillImplWitnessWithErrors(Context& context, SemIR::Impl& impl) -> void {
if (impl.witness_id == SemIR::ErrorInst::InstId) {
return;
}
auto witness = context.insts().GetAs<SemIR::ImplWitness>(impl.witness_id);
auto witness_table =
context.insts().GetAs<SemIR::ImplWitnessTable>(witness.witness_table_id);
auto witness_block =
context.inst_blocks().GetMutable(witness_table.elements_id);
for (auto& elem : witness_block) {
if (elem == SemIR::InstId::ImplWitnessTablePlaceholder) {
elem = SemIR::ErrorInst::InstId;
}
}
impl.witness_id = SemIR::ErrorInst::InstId;
}
auto IsImplEffectivelyFinal(Context& context, const SemIR::Impl& impl) -> bool {
return impl.is_final ||
(context.constant_values().Get(impl.self_id).is_concrete() &&
context.constant_values().Get(impl.constraint_id).is_concrete());
}
auto CheckConstraintIsInterface(Context& context, SemIR::InstId impl_decl_id,
SemIR::TypeInstId constraint_id)
-> SemIR::SpecificInterface {
auto facet_type_id = context.types().GetTypeIdForTypeInstId(constraint_id);
if (facet_type_id == SemIR::ErrorInst::TypeId) {
return SemIR::SpecificInterface::None;
}
auto facet_type = context.types().TryGetAs<SemIR::FacetType>(facet_type_id);
if (!facet_type) {
CARBON_DIAGNOSTIC(ImplAsNonFacetType, Error, "impl as non-facet type {0}",
InstIdAsType);
context.emitter().Emit(impl_decl_id, ImplAsNonFacetType, constraint_id);
return SemIR::SpecificInterface::None;
}
auto identified_id = RequireIdentifiedFacetType(
context, SemIR::LocId(constraint_id), *facet_type, [&] {
CARBON_DIAGNOSTIC(ImplOfUnidentifiedFacetType, Error,
"facet type {0} cannot be identified in `impl as`",
InstIdAsType);
return context.emitter().Build(
impl_decl_id, ImplOfUnidentifiedFacetType, constraint_id);
});
if (!identified_id.has_value()) {
return SemIR::SpecificInterface::None;
}
const auto& identified = context.identified_facet_types().Get(identified_id);
if (!identified.is_valid_impl_as_target()) {
CARBON_DIAGNOSTIC(ImplOfNotOneInterface, Error,
"impl as {0} interfaces, expected 1", int);
context.emitter().Emit(impl_decl_id, ImplOfNotOneInterface,
identified.num_interfaces_to_impl());
return SemIR::SpecificInterface::None;
}
return identified.impl_as_target_interface();
}
// Returns true if impl redeclaration parameters match.
static auto CheckImplRedeclParamsMatch(Context& context,
const SemIR::Impl& new_impl,
SemIR::ImplId prev_impl_id) -> bool {
auto& prev_impl = context.impls().Get(prev_impl_id);
// If the parameters aren't the same, then this is not a redeclaration of this
// `impl`. Keep looking for a prior declaration without issuing a diagnostic.
if (!CheckRedeclParamsMatch(context, DeclParams(new_impl),
DeclParams(prev_impl), SemIR::SpecificId::None,
/*diagnose=*/false, /*check_syntax=*/true,
/*check_self=*/true)) {
// NOLINTNEXTLINE(readability-simplify-boolean-expr)
return false;
}
return true;
}
// Returns whether an impl can be redeclared. For example, defined impls
// cannot be redeclared.
static auto IsValidImplRedecl(Context& context, const SemIR::Impl& new_impl,
SemIR::ImplId prev_impl_id) -> bool {
auto& prev_impl = context.impls().Get(prev_impl_id);
// TODO: Following #3763, disallow redeclarations in different scopes.
// Following #4672, disallowing defining non-extern declarations in another
// file.
if (auto import_ref =
context.insts().TryGetAs<SemIR::AnyImportRef>(prev_impl.self_id)) {
// TODO: Handle extern.
CARBON_DIAGNOSTIC(RedeclImportedImpl, Error,
"redeclaration of imported impl");
// TODO: Note imported declaration
context.emitter().Emit(new_impl.latest_decl_id(), RedeclImportedImpl);
return false;
}
if (prev_impl.has_definition_started()) {
// Impls aren't merged in order to avoid generic region lookup into a
// mismatching table.
CARBON_DIAGNOSTIC(ImplRedefinition, Error,
"redefinition of `impl {0} as {1}`", InstIdAsRawType,
InstIdAsRawType);
CARBON_DIAGNOSTIC(ImplPreviousDefinition, Note,
"previous definition was here");
context.emitter()
.Build(new_impl.latest_decl_id(), ImplRedefinition, new_impl.self_id,
new_impl.constraint_id)
.Note(prev_impl.definition_id, ImplPreviousDefinition)
.Emit();
return false;
}
// TODO: Only allow redeclaration in a match_first/impl_priority block.
return true;
}
// Sets the `ImplId` in the `ImplWitnessTable`.
static auto AssignImplIdInWitness(Context& context, SemIR::ImplId impl_id,
SemIR::InstId witness_id) -> void {
if (witness_id == SemIR::ErrorInst::InstId) {
return;
}
auto witness = context.insts().GetAs<SemIR::ImplWitness>(witness_id);
auto witness_table =
context.insts().GetAs<SemIR::ImplWitnessTable>(witness.witness_table_id);
witness_table.impl_id = impl_id;
// Note: The `ImplWitnessTable` instruction is `Unique`, so while this marks
// the instruction as being a dependent instruction of a generic impl, it will
// not be substituted into the eval block.
ReplaceInstBeforeConstantUse(context, witness.witness_table_id,
witness_table);
}
// Looks for any unused generic bindings. If one is found, it is diagnosed and
// false is returned.
static auto VerifyAllGenericBindingsUsed(Context& context, SemIR::LocId loc_id,
SemIR::LocId implicit_params_loc_id,
SemIR::Impl& impl) -> bool {
if (impl.witness_id == SemIR::ErrorInst::InstId) {
return true;
}
if (!impl.generic_id.has_value()) {
return true;
}
if (impl.implicit_param_patterns_id.has_value()) {
for (auto inst_id :
context.inst_blocks().Get(impl.implicit_param_patterns_id)) {
if (inst_id == SemIR::ErrorInst::InstId) {
// An error was already diagnosed for a generic binding.
return true;
}
}
}
auto deduced_specific_id = DeduceImplArguments(
context, loc_id, impl, context.constant_values().Get(impl.self_id),
impl.interface.specific_id);
if (deduced_specific_id.has_value()) {
// Deduction succeeded, all bindings were used.
return true;
}
CARBON_DIAGNOSTIC(ImplUnusedBinding, Error,
"`impl` with unused generic binding");
// TODO: This location may be incorrect, the binding may be inherited
// from an outer declaration. It would be nice to get the particular
// binding that was undeducible back from DeduceImplArguments here and
// use that.
auto diag_loc_id =
implicit_params_loc_id.has_value() ? implicit_params_loc_id : loc_id;
context.emitter().Emit(diag_loc_id, ImplUnusedBinding);
return false;
}
// Apply an `extend impl` declaration by extending the parent scope with the
// `impl`. If there's an error it is diagnosed and false is returned.
static auto ApplyExtendImplAs(Context& context, SemIR::LocId loc_id,
const SemIR::Impl& impl,
Parse::NodeId extend_node,
SemIR::LocId implicit_params_loc_id) -> bool {
auto parent_scope_id = context.decl_name_stack().PeekParentScopeId();
// TODO: Also handle the parent scope being a mixin or an interface.
auto class_scope = TryAsClassScope(context, parent_scope_id);
if (!class_scope) {
if (impl.witness_id != SemIR::ErrorInst::InstId) {
CARBON_DIAGNOSTIC(
ExtendImplOutsideClass, Error,
"`extend impl` can only be used in an interface or class");
context.emitter().Emit(loc_id, ExtendImplOutsideClass);
}
return false;
}
auto& parent_scope = *class_scope->name_scope;
// An error was already diagnosed, but this is `extend impl as` inside a
// class, so propagate the error into the enclosing class scope.
if (impl.witness_id == SemIR::ErrorInst::InstId) {
parent_scope.set_has_error();
return false;
}
if (implicit_params_loc_id.has_value()) {
CARBON_DIAGNOSTIC(ExtendImplForall, Error,
"cannot `extend` a parameterized `impl`");
context.emitter().Emit(extend_node, ExtendImplForall);
parent_scope.set_has_error();
return false;
}
if (!RequireCompleteType(
context, context.types().GetTypeIdForTypeInstId(impl.constraint_id),
SemIR::LocId(impl.constraint_id), [&] {
CARBON_DIAGNOSTIC(ExtendImplAsIncomplete, Error,
"`extend impl as` incomplete facet type {0}",
InstIdAsType);
return context.emitter().Build(impl.latest_decl_id(),
ExtendImplAsIncomplete,
impl.constraint_id);
})) {
parent_scope.set_has_error();
return false;
}
if (!impl.generic_id.has_value()) {
parent_scope.AddExtendedScope(impl.constraint_id);
} else {
auto constraint_id_in_self_specific = AddTypeInst<SemIR::SpecificConstant>(
context, SemIR::LocId(impl.constraint_id),
{.type_id = SemIR::TypeType::TypeId,
.inst_id = impl.constraint_id,
.specific_id = context.generics().GetSelfSpecific(impl.generic_id)});
parent_scope.AddExtendedScope(constraint_id_in_self_specific);
}
return true;
}
auto GetOrAddImpl(Context& context, SemIR::LocId loc_id,
SemIR::LocId implicit_params_loc_id, SemIR::Impl impl,
Parse::NodeId extend_node) -> SemIR::ImplId {
auto impl_id = SemIR::ImplId::None;
// Look for an existing matching declaration.
auto lookup_bucket_ref = context.impls().GetOrAddLookupBucket(impl);
// TODO: Detect two impl declarations with the same self type and interface,
// and issue an error if they don't match.
for (auto prev_impl_id : lookup_bucket_ref) {
if (CheckImplRedeclParamsMatch(context, impl, prev_impl_id)) {
if (IsValidImplRedecl(context, impl, prev_impl_id)) {
impl_id = prev_impl_id;
} else {
// IsValidImplRedecl() has issued a diagnostic, take care to avoid
// generating more diagnostics for this declaration.
impl.witness_id = SemIR::ErrorInst::InstId;
}
break;
}
}
if (impl_id.has_value()) {
// This is a redeclaration of another impl, now held in `impl_id`.
auto& prev_impl = context.impls().Get(impl_id);
FinishGenericRedecl(context, prev_impl.generic_id);
return impl_id;
}
// This is a new declaration (possibly with an attached definition). Create a
// new `impl_id`, filling the missing generic and witness in the provided
// `Impl`.
impl.generic_id = BuildGeneric(context, impl.latest_decl_id());
// Due to lack of an instruction to set to `ErrorInst`, an `InterfaceId::None`
// indicates that the interface could not be identified and an error was
// diagnosed. If there's any error in the construction of the impl, then the
// witness can't be constructed. We set it to `ErrorInst` to make the impl
// unusable for impl lookup.
if (!impl.interface.interface_id.has_value() ||
impl.self_id == SemIR::ErrorInst::TypeInstId ||
impl.constraint_id == SemIR::ErrorInst::TypeInstId) {
impl.witness_id = SemIR::ErrorInst::InstId;
// TODO: We might also want to mark that the name scope for the impl has an
// error -- at least once we start making name lookups within the impl also
// look into the facet (eg, so you can name associated constants from within
// the impl).
}
if (impl.witness_id != SemIR::ErrorInst::InstId) {
// This makes either a placeholder witness or a full witness table. The full
// witness table is deferred to the impl definition unless the declaration
// uses rewrite constraints to set values of associated constants in the
// interface.
impl.witness_id = ImplWitnessForDeclaration(context, impl);
}
FinishGenericDecl(context, SemIR::LocId(impl.latest_decl_id()),
impl.generic_id);
// From here on, use the `Impl` from the `ImplStore` instead of `impl` in
// order to make and see any changes to the `Impl`.
impl_id = context.impls().Add(impl);
lookup_bucket_ref.push_back(impl_id);
AssignImplIdInWitness(context, impl_id, impl.witness_id);
auto& stored_impl = context.impls().Get(impl_id);
// Look to see if there are any generic bindings on the `impl` declaration
// that are not deducible. If so, and the `impl` does not actually use all its
// generic bindings, and will never be matched. This should be diagnosed to
// the user.
if (!VerifyAllGenericBindingsUsed(context, loc_id, implicit_params_loc_id,
stored_impl)) {
FillImplWitnessWithErrors(context, stored_impl);
}
if (extend_node.has_value()) {
if (!ApplyExtendImplAs(context, loc_id, stored_impl, extend_node,
implicit_params_loc_id)) {
FillImplWitnessWithErrors(context, stored_impl);
}
}
return impl_id;
}
} // namespace Carbon::Check
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