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Richard SmithandJon Ross-Perkins
fcfb1345d5
For an expression such as `(Type as Interface).AssocFn()`, track the `Self` type `Type` in the result of the member access so that it's available when checking the function call. This introduces a new kind of type, `ImplFunctionType`, that represents the type of a function that is expected within an impl, modeled as the type of the function within the interface plus a value to use as `Self`. Calls to values of this type behave like calls to the underlying function except that the `Self` parameter is pre-bound to the self type from the facet. In order to support this, fix an issue where the imported list of generic bindings lost their association with their enclosing generic. This adds a little complexity to `import_ref`, including a new recursive cycle that I intend to address in a follow-up PR. --------- Co-authored-by: Jon Ross-Perkins <jperkins@google.com>
230 lines
9.6 KiB
C++
230 lines
9.6 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/call.h"
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#include "toolchain/base/kind_switch.h"
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#include "toolchain/check/context.h"
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#include "toolchain/check/convert.h"
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#include "toolchain/check/deduce.h"
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#include "toolchain/check/function.h"
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#include "toolchain/diagnostics/format_providers.h"
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#include "toolchain/sem_ir/builtin_function_kind.h"
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#include "toolchain/sem_ir/entity_with_params_base.h"
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#include "toolchain/sem_ir/ids.h"
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#include "toolchain/sem_ir/inst.h"
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#include "toolchain/sem_ir/typed_insts.h"
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namespace Carbon::Check {
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namespace {
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// Entity kinds, for diagnostics. Converted to an int for a select.
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enum class EntityKind : uint8_t {
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Function = 0,
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GenericClass = 1,
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GenericInterface = 2,
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};
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} // namespace
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// Resolves the callee expression in a call to a specific callee, or diagnoses
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// if no specific callee can be identified. This verifies the arity of the
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// callee and determines any compile-time arguments, but doesn't check that the
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// runtime arguments are convertible to the parameter types.
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//
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// `self_id` and `arg_ids` are the self argument and explicit arguments in the
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// call.
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//
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// Returns a `SpecificId` for the specific callee, `SpecificId::None` if the
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// callee is not generic, or `nullopt` if an error has been diagnosed.
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static auto ResolveCalleeInCall(Context& context, SemIR::LocId loc_id,
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const SemIR::EntityWithParamsBase& entity,
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EntityKind entity_kind_for_diagnostic,
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SemIR::SpecificId enclosing_specific_id,
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SemIR::InstId self_type_id,
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SemIR::InstId self_id,
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llvm::ArrayRef<SemIR::InstId> arg_ids)
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-> std::optional<SemIR::SpecificId> {
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// Check that the arity matches.
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auto params = context.inst_blocks().GetOrEmpty(entity.param_patterns_id);
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if (arg_ids.size() != params.size()) {
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CARBON_DIAGNOSTIC(CallArgCountMismatch, Error,
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"{0} argument{0:s} passed to "
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"{1:=0:function|=1:generic class|=2:generic interface}"
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" expecting {2} argument{2:s}",
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IntAsSelect, IntAsSelect, IntAsSelect);
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CARBON_DIAGNOSTIC(
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InCallToEntity, Note,
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"calling {0:=0:function|=1:generic class|=2:generic interface}"
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" declared here",
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IntAsSelect);
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context.emitter()
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.Build(loc_id, CallArgCountMismatch, arg_ids.size(),
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static_cast<int>(entity_kind_for_diagnostic), params.size())
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.Note(entity.latest_decl_id(), InCallToEntity,
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static_cast<int>(entity_kind_for_diagnostic))
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.Emit();
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return std::nullopt;
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}
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// Perform argument deduction.
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auto specific_id = SemIR::SpecificId::None;
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if (entity.generic_id.has_value()) {
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specific_id = DeduceGenericCallArguments(
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context, loc_id, entity.generic_id, enclosing_specific_id, self_type_id,
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entity.implicit_param_patterns_id, entity.param_patterns_id, self_id,
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arg_ids);
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if (!specific_id.has_value()) {
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return std::nullopt;
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}
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}
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return specific_id;
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}
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// Performs a call where the callee is the name of a generic class, such as
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// `Vector(i32)`.
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static auto PerformCallToGenericClass(Context& context, SemIR::LocId loc_id,
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SemIR::ClassId class_id,
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SemIR::SpecificId enclosing_specific_id,
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llvm::ArrayRef<SemIR::InstId> arg_ids)
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-> SemIR::InstId {
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const auto& generic_class = context.classes().Get(class_id);
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auto callee_specific_id =
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ResolveCalleeInCall(context, loc_id, generic_class,
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EntityKind::GenericClass, enclosing_specific_id,
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/*self_type_id=*/SemIR::InstId::None,
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/*self_id=*/SemIR::InstId::None, arg_ids);
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if (!callee_specific_id) {
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return SemIR::ErrorInst::SingletonInstId;
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}
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return context.GetOrAddInst<SemIR::ClassType>(
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loc_id, {.type_id = SemIR::TypeType::SingletonTypeId,
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.class_id = class_id,
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.specific_id = *callee_specific_id});
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}
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// Performs a call where the callee is the name of a generic interface, such as
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// `AddWith(i32)`.
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static auto PerformCallToGenericInterface(
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Context& context, SemIR::LocId loc_id, SemIR::InterfaceId interface_id,
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SemIR::SpecificId enclosing_specific_id,
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llvm::ArrayRef<SemIR::InstId> arg_ids) -> SemIR::InstId {
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const auto& interface = context.interfaces().Get(interface_id);
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auto callee_specific_id =
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ResolveCalleeInCall(context, loc_id, interface,
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EntityKind::GenericInterface, enclosing_specific_id,
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/*self_type_id=*/SemIR::InstId::None,
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/*self_id=*/SemIR::InstId::None, arg_ids);
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if (!callee_specific_id) {
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return SemIR::ErrorInst::SingletonInstId;
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}
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return context.GetOrAddInst(loc_id, context.FacetTypeFromInterface(
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interface_id, *callee_specific_id));
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}
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auto PerformCall(Context& context, SemIR::LocId loc_id, SemIR::InstId callee_id,
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llvm::ArrayRef<SemIR::InstId> arg_ids) -> SemIR::InstId {
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// Identify the function we're calling.
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auto callee_function = GetCalleeFunction(context.sem_ir(), callee_id);
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if (!callee_function.function_id.has_value()) {
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auto type_inst =
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context.types().GetAsInst(context.insts().Get(callee_id).type_id());
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CARBON_KIND_SWITCH(type_inst) {
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case CARBON_KIND(SemIR::GenericClassType generic_class): {
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return PerformCallToGenericClass(
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context, loc_id, generic_class.class_id,
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generic_class.enclosing_specific_id, arg_ids);
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}
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case CARBON_KIND(SemIR::GenericInterfaceType generic_interface): {
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return PerformCallToGenericInterface(
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context, loc_id, generic_interface.interface_id,
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generic_interface.enclosing_specific_id, arg_ids);
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}
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default: {
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if (!callee_function.is_error) {
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CARBON_DIAGNOSTIC(CallToNonCallable, Error,
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"value of type {0} is not callable", TypeOfInstId);
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context.emitter().Emit(loc_id, CallToNonCallable, callee_id);
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}
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return SemIR::ErrorInst::SingletonInstId;
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}
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}
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}
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// If the callee is a generic function, determine the generic argument values
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// for the call.
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auto callee_specific_id = ResolveCalleeInCall(
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context, loc_id, context.functions().Get(callee_function.function_id),
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EntityKind::Function, callee_function.enclosing_specific_id,
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callee_function.self_type_id, callee_function.self_id, arg_ids);
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if (!callee_specific_id) {
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return SemIR::ErrorInst::SingletonInstId;
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}
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if (callee_specific_id->has_value()) {
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callee_id = context.GetOrAddInst(
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context.insts().GetLocId(callee_id),
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SemIR::SpecificFunction{
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.type_id = context.GetSingletonType(
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SemIR::SpecificFunctionType::SingletonInstId),
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.callee_id = callee_id,
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.specific_id = *callee_specific_id});
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if (callee_function.self_type_id.has_value()) {
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// This is an associated function, and will be required to be defined as
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// part of checking that the impl is complete.
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} else {
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context.definitions_required().push_back(callee_id);
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}
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}
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// If there is a return slot, build storage for the result.
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SemIR::InstId return_slot_arg_id = SemIR::InstId::None;
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SemIR::ReturnTypeInfo return_info = [&] {
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auto& function = context.functions().Get(callee_function.function_id);
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DiagnosticAnnotationScope annotate_diagnostics(
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&context.emitter(), [&](auto& builder) {
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CARBON_DIAGNOSTIC(IncompleteReturnTypeHere, Note,
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"return type declared here");
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builder.Note(function.return_slot_pattern_id,
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IncompleteReturnTypeHere);
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});
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return CheckFunctionReturnType(context, loc_id, function,
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*callee_specific_id);
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}();
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switch (return_info.init_repr.kind) {
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case SemIR::InitRepr::InPlace:
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// Tentatively put storage for a temporary in the function's return slot.
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// This will be replaced if necessary when we perform initialization.
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return_slot_arg_id = context.AddInst<SemIR::TemporaryStorage>(
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loc_id, {.type_id = return_info.type_id});
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break;
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case SemIR::InitRepr::None:
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// For functions with an implicit return type, the return type is the
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// empty tuple type.
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if (!return_info.type_id.has_value()) {
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return_info.type_id = context.GetTupleType({});
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}
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break;
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case SemIR::InitRepr::ByCopy:
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break;
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case SemIR::InitRepr::Incomplete:
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// Don't form an initializing expression with an incomplete type.
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// CheckFunctionReturnType will have diagnosed this for us if needed.
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return_info.type_id = SemIR::ErrorInst::SingletonTypeId;
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break;
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}
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// Convert the arguments to match the parameters.
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auto converted_args_id = ConvertCallArgs(
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context, loc_id, callee_function.self_id, arg_ids, return_slot_arg_id,
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context.functions().Get(callee_function.function_id),
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*callee_specific_id);
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auto call_inst_id =
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context.GetOrAddInst<SemIR::Call>(loc_id, {.type_id = return_info.type_id,
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.callee_id = callee_id,
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.args_id = converted_args_id});
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return call_inst_id;
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}
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} // namespace Carbon::Check
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