mirror of
https://github.com/carbon-language/carbon-lang.git
synced 2026-09-24 22:02:23 +01:00
Dana Jansens
3d77c4441b
This makes all `.Self` references in a facet type canonically the same (which will remain true iff they refer to the same `Self` type in the future), removing the need to do more complex comparisons between them using the EntityName, interface, and index. This allows the comparison of types containing `.Self` references to be done correctly regardless of where the `.Self` appears, as such type expressions will all be canonically equal if they otherwise equal now, regardless of whether they are written in the context where `.Self` could have seen different `Self` facet types. In order to retain access to constraints on a base `.Self` facet type, in the case of applying `where` to an existing facet type, we: - Give the base facet type as a `RequirementBaseFacetType` constraint so that eval of `WhereExpr` can find and copy all the constraints off of it. - Introduce eager/early rewrite constraint resolution, which allows a constraint to eagerly resolve access to earlier rewrite constraints (`where .A = () and .B = .A` is eagerly transformed into `where .A = () and .B = ()`) before the full constraint resolution step. This allows use of rewrite constraints in larger type expressions, such as `where .A = () and .B = C(.A)` and `C` will know that the argument is `()`.
219 lines
8.3 KiB
C++
219 lines
8.3 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/type.h"
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#include "toolchain/check/eval.h"
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#include "toolchain/check/facet_type.h"
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#include "toolchain/check/type_completion.h"
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#include "toolchain/sem_ir/facet_type_info.h"
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namespace Carbon::Check {
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// Enforces that an integer type has a valid bit width.
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auto ValidateIntType(Context& context, SemIR::LocId loc_id,
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SemIR::IntType result) -> bool {
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auto bit_width =
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context.insts().TryGetAs<SemIR::IntValue>(result.bit_width_id);
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if (!bit_width) {
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// Symbolic bit width.
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return true;
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}
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const auto& bit_width_val = context.ints().Get(bit_width->int_id);
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if (bit_width_val.isZero() ||
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(context.types().IsSignedInt(bit_width->type_id) &&
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bit_width_val.isNegative())) {
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CARBON_DIAGNOSTIC(IntWidthNotPositive, Error,
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"integer type width of {0} is not positive", TypedInt);
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context.emitter().Emit(
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loc_id, IntWidthNotPositive,
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{.type = bit_width->type_id, .value = bit_width_val});
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return false;
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}
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if (bit_width_val.ugt(IntStore::MaxIntWidth)) {
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CARBON_DIAGNOSTIC(IntWidthTooLarge, Error,
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"integer type width of {0} is greater than the "
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"maximum supported width of {1}",
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TypedInt, int);
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context.emitter().Emit(loc_id, IntWidthTooLarge,
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{.type = bit_width->type_id, .value = bit_width_val},
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IntStore::MaxIntWidth);
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return false;
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}
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return true;
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}
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// Enforces that the bit width is 64 for a float.
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auto ValidateFloatBitWidth(Context& context, SemIR::LocId loc_id,
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SemIR::InstId inst_id) -> bool {
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auto inst = context.insts().GetAs<SemIR::IntValue>(inst_id);
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if (context.ints().Get(inst.int_id) == 64) {
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return true;
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}
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CARBON_DIAGNOSTIC(CompileTimeFloatBitWidth, Error, "bit width must be 64");
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context.emitter().Emit(loc_id, CompileTimeFloatBitWidth);
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return false;
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}
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// Enforces that a float type has a valid bit width.
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auto ValidateFloatType(Context& context, SemIR::LocId loc_id,
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SemIR::FloatType result) -> bool {
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auto bit_width =
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context.insts().TryGetAs<SemIR::IntValue>(result.bit_width_id);
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if (!bit_width) {
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// Symbolic bit width.
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return true;
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}
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return ValidateFloatBitWidth(context, loc_id, result.bit_width_id);
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}
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// Gets or forms a type_id for a type, given the instruction kind and arguments.
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template <typename InstT, typename... EachArgT>
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static auto GetTypeImpl(Context& context, EachArgT... each_arg)
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-> SemIR::TypeId {
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InstT inst = {SemIR::TypeType::TypeId, each_arg...};
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return context.types().GetTypeIdForTypeConstantId(TryEvalInst(context, inst));
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}
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// Gets or forms a type_id for a type, given the instruction kind and arguments,
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// and completes the type. This should only be used when type completion cannot
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// fail.
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template <typename InstT, typename... EachArgT>
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static auto GetCompleteTypeImpl(Context& context, EachArgT... each_arg)
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-> SemIR::TypeId {
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auto type_id = GetTypeImpl<InstT>(context, each_arg...);
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CompleteTypeOrCheckFail(context, type_id);
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return type_id;
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}
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auto GetStructType(Context& context, SemIR::StructTypeFieldsId fields_id)
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-> SemIR::TypeId {
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return GetTypeImpl<SemIR::StructType>(context, fields_id);
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}
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auto GetTupleType(Context& context, llvm::ArrayRef<SemIR::InstId> type_inst_ids)
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-> SemIR::TypeId {
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return GetTypeImpl<SemIR::TupleType>(
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context, context.inst_blocks().AddCanonical(type_inst_ids));
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}
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auto GetAssociatedEntityType(Context& context, SemIR::InterfaceId interface_id,
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SemIR::SpecificId interface_specific_id)
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-> SemIR::TypeId {
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return GetTypeImpl<SemIR::AssociatedEntityType>(context, interface_id,
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interface_specific_id);
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}
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auto GetConstType(Context& context, SemIR::TypeInstId inner_type_id)
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-> SemIR::TypeId {
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return GetTypeImpl<SemIR::ConstType>(context, inner_type_id);
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}
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auto GetSingletonType(Context& context, SemIR::TypeInstId singleton_id)
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-> SemIR::TypeId {
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CARBON_CHECK(SemIR::IsSingletonInstId(singleton_id));
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auto type_id = context.types().GetTypeIdForTypeInstId(singleton_id);
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// To keep client code simpler, complete builtin types before returning them.
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CompleteTypeOrCheckFail(context, type_id);
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return type_id;
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}
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auto GetClassType(Context& context, SemIR::ClassId class_id,
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SemIR::SpecificId specific_id) -> SemIR::TypeId {
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return GetTypeImpl<SemIR::ClassType>(context, class_id, specific_id);
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}
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auto GetFunctionType(Context& context, SemIR::FunctionId fn_id,
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SemIR::SpecificId specific_id) -> SemIR::TypeId {
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return GetCompleteTypeImpl<SemIR::FunctionType>(context, fn_id, specific_id);
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}
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auto GetFunctionTypeWithSelfType(Context& context,
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SemIR::TypeInstId interface_function_type_id,
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SemIR::InstId self_id) -> SemIR::TypeId {
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return GetCompleteTypeImpl<SemIR::FunctionTypeWithSelfType>(
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context, interface_function_type_id, self_id);
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}
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auto GetGenericClassType(Context& context, SemIR::ClassId class_id,
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SemIR::SpecificId enclosing_specific_id)
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-> SemIR::TypeId {
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return GetCompleteTypeImpl<SemIR::GenericClassType>(context, class_id,
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enclosing_specific_id);
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}
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auto GetGenericInterfaceType(Context& context, SemIR::InterfaceId interface_id,
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SemIR::SpecificId enclosing_specific_id)
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-> SemIR::TypeId {
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return GetCompleteTypeImpl<SemIR::GenericInterfaceType>(
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context, interface_id, enclosing_specific_id);
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}
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auto GetInterfaceType(Context& context, SemIR::InterfaceId interface_id,
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SemIR::SpecificId specific_id) -> SemIR::TypeId {
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return GetTypeImpl<SemIR::FacetType>(
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context,
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FacetTypeFromInterface(context, interface_id, specific_id).facet_type_id);
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}
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auto GetFacetType(Context& context, const SemIR::FacetTypeInfo& info)
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-> SemIR::TypeId {
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return GetTypeImpl<SemIR::FacetType>(context,
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context.facet_types().Add(info));
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}
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auto GetPointerType(Context& context, SemIR::TypeInstId pointee_type_id)
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-> SemIR::TypeId {
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return GetTypeImpl<SemIR::PointerType>(context, pointee_type_id);
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}
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auto GetPatternType(Context& context, SemIR::TypeId scrutinee_type_id)
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-> SemIR::TypeId {
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CARBON_CHECK(!context.types().Is<SemIR::PatternType>(scrutinee_type_id),
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"Type is already a pattern type");
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if (scrutinee_type_id == SemIR::ErrorInst::TypeId) {
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return SemIR::ErrorInst::TypeId;
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}
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return GetTypeImpl<SemIR::PatternType>(
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context, context.types().GetInstId(scrutinee_type_id));
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}
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auto GetUnboundElementType(Context& context, SemIR::TypeInstId class_type_id,
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SemIR::TypeInstId element_type_id) -> SemIR::TypeId {
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return GetTypeImpl<SemIR::UnboundElementType>(context, class_type_id,
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element_type_id);
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}
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auto GetCanonicalizedFacetOrTypeValue(Context& context, SemIR::InstId inst_id)
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-> SemIR::InstId {
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// We can have FacetAccessType of a FacetValue, and a FacetValue of a
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// FacetAccessType, but they don't nest indefinitely.
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if (auto access = context.insts().TryGetAs<SemIR::FacetAccessType>(inst_id)) {
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inst_id = access->facet_value_inst_id;
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}
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if (auto value = context.insts().TryGetAs<SemIR::FacetValue>(inst_id)) {
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inst_id = value->type_inst_id;
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if (auto access =
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context.insts().TryGetAs<SemIR::FacetAccessType>(inst_id)) {
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inst_id = access->facet_value_inst_id;
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}
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}
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CARBON_CHECK(!context.insts().Is<SemIR::FacetAccessType>(inst_id));
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CARBON_CHECK(!context.insts().Is<SemIR::FacetValue>(inst_id));
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return context.constant_values().GetConstantInstId(inst_id);
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}
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auto GetCanonicalizedFacetOrTypeValue(Context& context,
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SemIR::ConstantId const_id)
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-> SemIR::ConstantId {
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return context.constant_values().Get(GetCanonicalizedFacetOrTypeValue(
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context, context.constant_values().GetInstId(const_id)));
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}
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} // namespace Carbon::Check
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