mirror of
https://github.com/carbon-language/carbon-lang.git
synced 2026-09-24 21:50:14 +01:00
Jon Ross-Perkins
acbe6530c3
What this really does is avoids shadowing names, so that we can comfortable have things like `Check::DiagnosticEmitter` or `Check::DiagnosticLoc` without shadowing being a concern. Note, down this path I'm also thinking about: - Renaming misc DiagnosticConsumer/DiagnosticEmitter classes, possibly just to DiagnosticConsumer/DiagnosticEmitter (so `Check::DiagnosticEmitter` instead of `SemIRLocDiagnosticEmitter`). - Dropping `Diagnostic` from `Emitter::DiagnosticBuilder`. - But not for `Check::DiagnosticBuilder`, because `Check::Builder` would be ambiguous. - Renaming diagnostics/diagnostic_* to drop "diagnostic". [Discussion about SemIRLoc -> DiagnosticLoc](https://discord.com/channels/655572317891461132/655578254970716160/1353771570463768698) reminded me of this (in particular the older [Check::DiagnosticBuilder discussion](https://discord.com/channels/655572317891461132/655578254970716160/1344363562608627763)), but I'd only do that rename if there's matching consensus about a path forward where we keep SemIRLoc, and in a way that it's only ever used for diagnostics (the divergence from which is at the root of current LocId discussion). I'm trying to keep that separate from a namespace addition for clarity.
269 lines
11 KiB
C++
269 lines
11 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/facet_type.h"
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#include "toolchain/check/function.h"
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#include "toolchain/check/inst.h"
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#include "toolchain/check/type.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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Diagnostics::IntAsSelect, Diagnostics::IntAsSelect,
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Diagnostics::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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Diagnostics::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 GetOrAddInst<SemIR::ClassType>(
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context, loc_id,
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{.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 GetOrAddInst(
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context, loc_id,
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FacetTypeFromInterface(context, 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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auto generic_callee_id = callee_id;
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// Strip off a bound_method so that we can form a constant specific callee.
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auto bound_method = context.insts().TryGetAs<SemIR::BoundMethod>(callee_id);
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if (bound_method) {
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generic_callee_id = bound_method->function_decl_id;
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}
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// Form a specific callee.
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if (callee_function.self_type_id.has_value()) {
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// This is an associated function in an interface; the callee is the
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// specific function in the impl that corresponds to the specific function
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// we deduced.
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callee_id = GetOrAddInst(
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context, context.insts().GetLocId(generic_callee_id),
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SemIR::SpecificImplFunction{
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.type_id = GetSingletonType(
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context, SemIR::SpecificFunctionType::SingletonInstId),
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.callee_id = generic_callee_id,
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.specific_id = *callee_specific_id});
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// TODO: Add to `definitions_required` when evaluating the
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// `SpecificImplFunction`.
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} else {
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// This is a regular generic function. The callee is the specific function
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// we deduced.
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callee_id = GetOrAddInst(
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context, context.insts().GetLocId(generic_callee_id),
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SemIR::SpecificFunction{
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.type_id = GetSingletonType(
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context, SemIR::SpecificFunctionType::SingletonInstId),
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.callee_id = generic_callee_id,
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.specific_id = *callee_specific_id});
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// TODO: The specific function could be a symbolic constant. Delay doing
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// this until we form a concrete `SpecificFunction` constant.
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context.definitions_required().push_back(callee_id);
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}
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// Add the `self` argument back if there was one.
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if (bound_method) {
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callee_id = GetOrAddInst<SemIR::BoundMethod>(
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context, loc_id,
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{.type_id = bound_method->type_id,
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.object_id = bound_method->object_id,
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.function_decl_id = 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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Diagnostics::AnnotationScope 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 = AddInst<SemIR::TemporaryStorage>(
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context, 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 = GetTupleType(context, {});
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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 = GetOrAddInst<SemIR::Call>(context, loc_id,
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{.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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