mirror of
https://github.com/carbon-language/carbon-lang.git
synced 2026-09-24 21:10:12 +01:00
Geoff Romer
9266f867f9
Also fix `Param` insts to have meaningful names in pretty-printing, to help clarify relationship with return slot.
225 lines
9.3 KiB
C++
225 lines
9.3 KiB
C++
// 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/call.h"
|
|
|
|
#include "toolchain/base/kind_switch.h"
|
|
#include "toolchain/check/context.h"
|
|
#include "toolchain/check/convert.h"
|
|
#include "toolchain/check/deduce.h"
|
|
#include "toolchain/check/function.h"
|
|
#include "toolchain/diagnostics/format_providers.h"
|
|
#include "toolchain/sem_ir/builtin_function_kind.h"
|
|
#include "toolchain/sem_ir/builtin_inst_kind.h"
|
|
#include "toolchain/sem_ir/entity_with_params_base.h"
|
|
#include "toolchain/sem_ir/ids.h"
|
|
#include "toolchain/sem_ir/inst.h"
|
|
#include "toolchain/sem_ir/typed_insts.h"
|
|
|
|
namespace Carbon::Check {
|
|
|
|
namespace {
|
|
// Entity kinds, for diagnostics. Converted to an int for a select.
|
|
enum class EntityKind : uint8_t {
|
|
Function = 0,
|
|
GenericClass = 1,
|
|
GenericInterface = 2,
|
|
};
|
|
} // namespace
|
|
|
|
// Resolves the callee expression in a call to a specific callee, or diagnoses
|
|
// if no specific callee can be identified. This verifies the arity of the
|
|
// callee and determines any compile-time arguments, but doesn't check that the
|
|
// runtime arguments are convertible to the parameter types.
|
|
//
|
|
// `self_id` and `arg_ids` are the self argument and explicit arguments in the
|
|
// call.
|
|
//
|
|
// Returns a `SpecificId` for the specific callee, `SpecificId::Invalid` if the
|
|
// callee is not generic, or `nullopt` if an error has been diagnosed.
|
|
static auto ResolveCalleeInCall(Context& context, SemIR::LocId loc_id,
|
|
const SemIR::EntityWithParamsBase& entity,
|
|
EntityKind entity_kind_for_diagnostic,
|
|
SemIR::GenericId entity_generic_id,
|
|
SemIR::SpecificId enclosing_specific_id,
|
|
SemIR::InstId self_id,
|
|
llvm::ArrayRef<SemIR::InstId> arg_ids)
|
|
-> std::optional<SemIR::SpecificId> {
|
|
CalleeParamsInfo callee_info(entity);
|
|
|
|
// Check that the arity matches.
|
|
auto params = context.inst_blocks().GetOrEmpty(callee_info.param_refs_id);
|
|
if (arg_ids.size() != params.size()) {
|
|
CARBON_DIAGNOSTIC(CallArgCountMismatch, Error,
|
|
"{0} argument{0:s} passed to "
|
|
"{1:=0:function|=1:generic class|=2:generic interface}"
|
|
" expecting {2} argument{2:s}",
|
|
IntAsSelect, IntAsSelect, IntAsSelect);
|
|
CARBON_DIAGNOSTIC(
|
|
InCallToEntity, Note,
|
|
"calling {0:=0:function|=1:generic class|=2:generic interface}"
|
|
" declared here",
|
|
IntAsSelect);
|
|
context.emitter()
|
|
.Build(loc_id, CallArgCountMismatch, arg_ids.size(),
|
|
static_cast<int>(entity_kind_for_diagnostic), params.size())
|
|
.Note(callee_info.callee_loc, InCallToEntity,
|
|
static_cast<int>(entity_kind_for_diagnostic))
|
|
.Emit();
|
|
return std::nullopt;
|
|
}
|
|
|
|
// Perform argument deduction.
|
|
auto specific_id = SemIR::SpecificId::Invalid;
|
|
if (entity_generic_id.is_valid()) {
|
|
specific_id = DeduceGenericCallArguments(
|
|
context, loc_id, entity_generic_id, enclosing_specific_id,
|
|
callee_info.implicit_param_patterns_id, callee_info.param_patterns_id,
|
|
self_id, arg_ids);
|
|
if (!specific_id.is_valid()) {
|
|
return std::nullopt;
|
|
}
|
|
}
|
|
return specific_id;
|
|
}
|
|
|
|
// Performs a call where the callee is the name of a generic class, such as
|
|
// `Vector(i32)`.
|
|
static auto PerformCallToGenericClass(Context& context, SemIR::LocId loc_id,
|
|
SemIR::ClassId class_id,
|
|
SemIR::SpecificId enclosing_specific_id,
|
|
llvm::ArrayRef<SemIR::InstId> arg_ids)
|
|
-> SemIR::InstId {
|
|
const auto& generic_class = context.classes().Get(class_id);
|
|
auto callee_specific_id = ResolveCalleeInCall(
|
|
context, loc_id, generic_class, EntityKind::GenericClass,
|
|
generic_class.generic_id, enclosing_specific_id,
|
|
/*self_id=*/SemIR::InstId::Invalid, arg_ids);
|
|
if (!callee_specific_id) {
|
|
return SemIR::InstId::BuiltinError;
|
|
}
|
|
return context.AddInst<SemIR::ClassType>(
|
|
loc_id, {.type_id = SemIR::TypeId::TypeType,
|
|
.class_id = class_id,
|
|
.specific_id = *callee_specific_id});
|
|
}
|
|
|
|
// Performs a call where the callee is the name of a generic interface, such as
|
|
// `AddWith(i32)`.
|
|
static auto PerformCallToGenericInterface(
|
|
Context& context, SemIR::LocId loc_id, SemIR::InterfaceId interface_id,
|
|
SemIR::SpecificId enclosing_specific_id,
|
|
llvm::ArrayRef<SemIR::InstId> arg_ids) -> SemIR::InstId {
|
|
const auto& interface = context.interfaces().Get(interface_id);
|
|
auto callee_specific_id = ResolveCalleeInCall(
|
|
context, loc_id, interface, EntityKind::GenericInterface,
|
|
interface.generic_id, enclosing_specific_id,
|
|
/*self_id=*/SemIR::InstId::Invalid, arg_ids);
|
|
if (!callee_specific_id) {
|
|
return SemIR::InstId::BuiltinError;
|
|
}
|
|
return context.AddInst<SemIR::InterfaceType>(
|
|
loc_id, {.type_id = SemIR::TypeId::TypeType,
|
|
.interface_id = interface_id,
|
|
.specific_id = *callee_specific_id});
|
|
}
|
|
|
|
auto PerformCall(Context& context, SemIR::LocId loc_id, SemIR::InstId callee_id,
|
|
llvm::ArrayRef<SemIR::InstId> arg_ids) -> SemIR::InstId {
|
|
// Identify the function we're calling.
|
|
auto callee_function = GetCalleeFunction(context.sem_ir(), callee_id);
|
|
if (!callee_function.function_id.is_valid()) {
|
|
auto type_inst =
|
|
context.types().GetAsInst(context.insts().Get(callee_id).type_id());
|
|
CARBON_KIND_SWITCH(type_inst) {
|
|
case CARBON_KIND(SemIR::GenericClassType generic_class): {
|
|
return PerformCallToGenericClass(
|
|
context, loc_id, generic_class.class_id,
|
|
generic_class.enclosing_specific_id, arg_ids);
|
|
}
|
|
case CARBON_KIND(SemIR::GenericInterfaceType generic_interface): {
|
|
return PerformCallToGenericInterface(
|
|
context, loc_id, generic_interface.interface_id,
|
|
generic_interface.enclosing_specific_id, arg_ids);
|
|
}
|
|
default: {
|
|
if (!callee_function.is_error) {
|
|
CARBON_DIAGNOSTIC(CallToNonCallable, Error,
|
|
"value of type {0} is not callable", TypeOfInstId);
|
|
context.emitter().Emit(loc_id, CallToNonCallable, callee_id);
|
|
}
|
|
return SemIR::InstId::BuiltinError;
|
|
}
|
|
}
|
|
}
|
|
auto& callable = context.functions().Get(callee_function.function_id);
|
|
|
|
// If the callee is a generic function, determine the generic argument values
|
|
// for the call.
|
|
auto callee_specific_id = ResolveCalleeInCall(
|
|
context, loc_id, callable, EntityKind::Function, callable.generic_id,
|
|
callee_function.enclosing_specific_id, callee_function.self_id, arg_ids);
|
|
if (!callee_specific_id) {
|
|
return SemIR::InstId::BuiltinError;
|
|
}
|
|
if (callee_specific_id->is_valid()) {
|
|
callee_id =
|
|
context.AddInst(context.insts().GetLocId(callee_id),
|
|
SemIR::SpecificFunction{
|
|
.type_id = context.GetBuiltinType(
|
|
SemIR::BuiltinInstKind::SpecificFunctionType),
|
|
.callee_id = callee_id,
|
|
.specific_id = *callee_specific_id});
|
|
context.definitions_required().push_back(callee_id);
|
|
}
|
|
|
|
// If there is a return slot, build storage for the result.
|
|
SemIR::InstId return_slot_arg_id = SemIR::InstId::Invalid;
|
|
SemIR::ReturnTypeInfo return_info = [&] {
|
|
DiagnosticAnnotationScope annotate_diagnostics(
|
|
&context.emitter(), [&](auto& builder) {
|
|
CARBON_DIAGNOSTIC(IncompleteReturnTypeHere, Note,
|
|
"return type declared here");
|
|
builder.Note(callable.return_slot_id, IncompleteReturnTypeHere);
|
|
});
|
|
return CheckFunctionReturnType(context, callee_id, callable,
|
|
*callee_specific_id);
|
|
}();
|
|
switch (return_info.init_repr.kind) {
|
|
case SemIR::InitRepr::InPlace:
|
|
// Tentatively put storage for a temporary in the function's return slot.
|
|
// This will be replaced if necessary when we perform initialization.
|
|
return_slot_arg_id = context.AddInst<SemIR::TemporaryStorage>(
|
|
loc_id, {.type_id = return_info.type_id});
|
|
break;
|
|
case SemIR::InitRepr::None:
|
|
// For functions with an implicit return type, the return type is the
|
|
// empty tuple type.
|
|
if (!return_info.type_id.is_valid()) {
|
|
return_info.type_id = context.GetTupleType({});
|
|
}
|
|
break;
|
|
case SemIR::InitRepr::ByCopy:
|
|
break;
|
|
case SemIR::InitRepr::Incomplete:
|
|
// Don't form an initializing expression with an incomplete type.
|
|
// CheckFunctionReturnType will have diagnosed this for us if needed.
|
|
return_info.type_id = SemIR::TypeId::Error;
|
|
break;
|
|
}
|
|
|
|
// Convert the arguments to match the parameters.
|
|
auto converted_args_id = ConvertCallArgs(
|
|
context, loc_id, callee_function.self_id, arg_ids, return_slot_arg_id,
|
|
CalleeParamsInfo(callable), *callee_specific_id);
|
|
auto call_inst_id =
|
|
context.AddInst<SemIR::Call>(loc_id, {.type_id = return_info.type_id,
|
|
.callee_id = callee_id,
|
|
.args_id = converted_args_id});
|
|
|
|
return call_inst_id;
|
|
}
|
|
|
|
} // namespace Carbon::Check
|