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https://github.com/carbon-language/carbon-lang.git
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Geoff RomerandJon Ross-Perkins
9d942f4633
Also propagate the pattern IR along with the pattern-match IR, and use it where appropriate. Strictly speaking, some parts of the pattern-match IR are allocated eagerly, while traversing the pattern's parse tree, but they still aren't actually emitted until we traverse the associated pattern insts. --------- Co-authored-by: Jon Ross-Perkins <jperkins@google.com>
209 lines
8.9 KiB
C++
209 lines
8.9 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/sem_ir/builtin_function_kind.h"
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#include "toolchain/sem_ir/builtin_inst_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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// 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::Invalid` 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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llvm::StringLiteral entity_kind_for_diagnostic,
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SemIR::GenericId entity_generic_id,
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SemIR::SpecificId enclosing_specific_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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CalleeParamsInfo callee_info(entity);
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// Check that the arity matches.
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auto params = context.inst_blocks().GetOrEmpty(callee_info.param_refs_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(s) passed to {1} expecting "
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"{2} argument(s).",
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int, llvm::StringLiteral, int);
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CARBON_DIAGNOSTIC(InCallToEntity, Note, "calling {0} declared here",
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llvm::StringLiteral);
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context.emitter()
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.Build(loc_id, CallArgCountMismatch, arg_ids.size(),
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entity_kind_for_diagnostic, params.size())
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.Note(callee_info.callee_loc, InCallToEntity,
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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::Invalid;
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if (entity_generic_id.is_valid()) {
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specific_id = DeduceGenericCallArguments(
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context, loc_id, entity_generic_id, enclosing_specific_id,
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callee_info.implicit_param_patterns_id, callee_info.param_patterns_id,
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self_id, arg_ids);
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if (!specific_id.is_valid()) {
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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 = ResolveCalleeInCall(
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context, loc_id, generic_class, "generic class", generic_class.generic_id,
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enclosing_specific_id, /*self_id=*/SemIR::InstId::Invalid, arg_ids);
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if (!callee_specific_id) {
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return SemIR::InstId::BuiltinError;
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}
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return context.AddInst<SemIR::ClassType>(
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loc_id, {.type_id = SemIR::TypeId::TypeType,
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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 = ResolveCalleeInCall(
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context, loc_id, interface, "generic interface", interface.generic_id,
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enclosing_specific_id, /*self_id=*/SemIR::InstId::Invalid, arg_ids);
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if (!callee_specific_id) {
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return SemIR::InstId::BuiltinError;
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}
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return context.AddInst<SemIR::InterfaceType>(
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loc_id, {.type_id = SemIR::TypeId::TypeType,
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.interface_id = interface_id,
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.specific_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.is_valid()) {
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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::InstId::BuiltinError;
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}
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}
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}
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auto& callable = context.functions().Get(callee_function.function_id);
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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, callable, "function", callable.generic_id,
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callee_function.enclosing_specific_id, callee_function.self_id, arg_ids);
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if (!callee_specific_id) {
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return SemIR::InstId::BuiltinError;
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}
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if (callee_specific_id->is_valid()) {
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callee_id =
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context.AddInst(context.insts().GetLocId(callee_id),
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SemIR::SpecificFunction{
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.type_id = context.GetBuiltinType(
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SemIR::BuiltinInstKind::SpecificFunctionType),
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.callee_id = callee_id,
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.specific_id = *callee_specific_id});
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context.definitions_required().push_back(callee_id);
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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_storage_id = SemIR::InstId::Invalid;
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SemIR::ReturnTypeInfo return_info = [&] {
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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(callable.return_storage_id, IncompleteReturnTypeHere);
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});
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return CheckFunctionReturnType(context, callee_id, callable,
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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_storage_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.is_valid()) {
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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::TypeId::Error;
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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_storage_id,
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CalleeParamsInfo(callable), *callee_specific_id);
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auto call_inst_id =
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context.AddInst<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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