mirror of
https://github.com/carbon-language/carbon-lang.git
synced 2026-09-24 21:50:14 +01:00
Jon Ross-Perkins
be56ff87c6
This converts `StructTypeField` from an instruction to a dedicated type, with its own store. This had originated from discussing how `.GetAs<SemIR::StructTypeField>` was more prevalent than for other instructions, but is probably more interesting for the storage savings (16 bytes StructTypeField + 4 byte LocId + 4 byte InstId -> 8 byte StructTypeField). Due to the different structure, these now have their own stack during construction, reducing (but not eliminating) `args_type_info_stack_` use-cases. The test changes of different InstIds is expected because structs and classes generate fewer instructions now. Other than that, results should remain the same. I'm generally trying to avoid unrelated cleanup here due to the PR size, though I did scrutinize the `VerifyOnFinish` calls, adding one and commenting others (putting them in member order because that's how I was checking what was verified and what wasn't).
539 lines
24 KiB
C++
539 lines
24 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/member_access.h"
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#include <optional>
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#include "llvm/ADT/STLExtras.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/impl_lookup.h"
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#include "toolchain/diagnostics/diagnostic_emitter.h"
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#include "toolchain/sem_ir/generic.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/name_scope.h"
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#include "toolchain/sem_ir/typed_insts.h"
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namespace Carbon::Check {
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// Returns the lookup scope corresponding to base_id, or nullopt if not a scope.
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// On invalid scopes, prints a diagnostic and still returns the scope.
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static auto GetAsLookupScope(Context& context, SemIR::LocId loc_id,
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SemIR::ConstantId base_const_id)
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-> std::optional<LookupScope> {
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auto base_id = context.constant_values().GetInstId(base_const_id);
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auto base = context.insts().Get(base_id);
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if (auto base_as_namespace = base.TryAs<SemIR::Namespace>()) {
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return LookupScope{.name_scope_id = base_as_namespace->name_scope_id,
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.specific_id = SemIR::SpecificId::Invalid};
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}
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// TODO: Consider refactoring the near-identical class and interface support
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// below.
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if (auto base_as_class = base.TryAs<SemIR::ClassType>()) {
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context.TryToDefineType(
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context.GetTypeIdForTypeConstant(base_const_id), [&] {
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CARBON_DIAGNOSTIC(QualifiedExprInIncompleteClassScope, Error,
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"member access into incomplete class {0}",
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InstIdAsType);
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return context.emitter().Build(
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loc_id, QualifiedExprInIncompleteClassScope, base_id);
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});
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auto& class_info = context.classes().Get(base_as_class->class_id);
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return LookupScope{.name_scope_id = class_info.scope_id,
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.specific_id = base_as_class->specific_id};
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}
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if (auto base_as_interface = base.TryAs<SemIR::InterfaceType>()) {
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context.TryToDefineType(
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context.GetTypeIdForTypeConstant(base_const_id), [&] {
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CARBON_DIAGNOSTIC(QualifiedExprInUndefinedInterfaceScope, Error,
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"member access into undefined interface {0}",
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InstIdAsType);
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return context.emitter().Build(
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loc_id, QualifiedExprInUndefinedInterfaceScope, base_id);
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});
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auto& interface_info =
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context.interfaces().Get(base_as_interface->interface_id);
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return LookupScope{.name_scope_id = interface_info.scope_id,
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.specific_id = base_as_interface->specific_id};
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}
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// TODO: Per the design, if `base_id` is any kind of type, then lookup should
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// treat it as a name scope, even if it doesn't have members. For example,
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// `(i32*).X` should fail because there's no name `X` in `i32*`, not because
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// there's no name `X` in `type`.
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return std::nullopt;
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}
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// Returns the index of the specified class element within the class's
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// representation.
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static auto GetClassElementIndex(Context& context, SemIR::InstId element_id)
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-> SemIR::ElementIndex {
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auto element_inst = context.insts().Get(element_id);
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if (auto field = element_inst.TryAs<SemIR::FieldDecl>()) {
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return field->index;
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}
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if (auto base = element_inst.TryAs<SemIR::BaseDecl>()) {
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return base->index;
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}
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CARBON_FATAL("Unexpected value {0} in class element name", element_inst);
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}
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// Returns whether `function_id` is an instance method, that is, whether it has
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// an implicit `self` parameter.
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static auto IsInstanceMethod(const SemIR::File& sem_ir,
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SemIR::FunctionId function_id) -> bool {
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const auto& function = sem_ir.functions().Get(function_id);
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for (auto param_id :
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sem_ir.inst_blocks().GetOrEmpty(function.implicit_param_patterns_id)) {
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if (SemIR::Function::GetNameFromPatternId(sem_ir, param_id) ==
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SemIR::NameId::SelfValue) {
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return true;
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}
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}
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return false;
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}
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// Returns the highest allowed access. For example, if this returns `Protected`
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// then only `Public` and `Protected` accesses are allowed--not `Private`.
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static auto GetHighestAllowedAccess(Context& context, SemIR::LocId loc_id,
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SemIR::ConstantId name_scope_const_id)
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-> SemIR::AccessKind {
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auto [_, self_type_inst_id] = context.LookupUnqualifiedName(
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loc_id.node_id(), SemIR::NameId::SelfType, /*required=*/false);
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if (!self_type_inst_id.is_valid()) {
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return SemIR::AccessKind::Public;
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}
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// TODO: Support other types for `Self`.
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auto self_class_type =
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context.insts().TryGetAs<SemIR::ClassType>(self_type_inst_id);
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if (!self_class_type) {
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return SemIR::AccessKind::Public;
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}
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auto self_class_info = context.classes().Get(self_class_type->class_id);
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// TODO: Support other types.
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if (auto class_type = context.insts().TryGetAs<SemIR::ClassType>(
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context.constant_values().GetInstId(name_scope_const_id))) {
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auto class_info = context.classes().Get(class_type->class_id);
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if (self_class_info.self_type_id == class_info.self_type_id) {
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return SemIR::AccessKind::Private;
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}
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// If the `type_id` of `Self` does not match with the one we're currently
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// accessing, try checking if this class is of the parent type of `Self`.
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if (auto base_decl = context.insts().TryGetAsIfValid<SemIR::BaseDecl>(
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self_class_info.base_id)) {
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if (base_decl->base_type_id == class_info.self_type_id) {
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return SemIR::AccessKind::Protected;
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}
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} else if (auto adapt_decl =
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context.insts().TryGetAsIfValid<SemIR::AdaptDecl>(
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self_class_info.adapt_id)) {
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if (adapt_decl->adapted_type_id == class_info.self_type_id) {
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return SemIR::AccessKind::Protected;
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}
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}
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}
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return SemIR::AccessKind::Public;
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}
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// Returns whether `scope` is a scope for which impl lookup should be performed
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// if we find an associated entity.
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static auto ScopeNeedsImplLookup(Context& context, LookupScope scope) -> bool {
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auto [_, inst] = context.name_scopes().GetInstIfValid(scope.name_scope_id);
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if (!inst) {
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return false;
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}
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if (inst->Is<SemIR::InterfaceDecl>()) {
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// Don't perform impl lookup if an associated entity is named as a member of
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// a facet type.
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return false;
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}
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if (inst->Is<SemIR::Namespace>()) {
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// Don't perform impl lookup if an associated entity is named as a namespace
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// member.
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// TODO: This case is not yet listed in the design.
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return false;
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}
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// Any other kind of scope is assumed to be a type that implements the
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// interface containing the associated entity, and impl lookup is performed.
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return true;
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}
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// Performs impl lookup for a member name expression. This finds the relevant
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// impl witness and extracts the corresponding impl member.
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static auto PerformImplLookup(
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Context& context, SemIR::LocId loc_id, SemIR::ConstantId type_const_id,
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SemIR::AssociatedEntityType assoc_type, SemIR::InstId member_id,
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Context::BuildDiagnosticFn missing_impl_diagnoser = nullptr)
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-> SemIR::InstId {
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auto interface_type =
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context.types().GetAs<SemIR::InterfaceType>(assoc_type.interface_type_id);
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auto& interface = context.interfaces().Get(interface_type.interface_id);
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auto witness_id =
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LookupInterfaceWitness(context, loc_id, type_const_id,
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assoc_type.interface_type_id.AsConstantId());
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if (!witness_id.is_valid()) {
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if (missing_impl_diagnoser) {
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// TODO: Pass in the expression whose type we are printing.
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CARBON_DIAGNOSTIC(MissingImplInMemberAccessNote, Note,
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"type {1} does not implement interface `{0}`",
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SemIR::NameId, SemIR::TypeId);
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missing_impl_diagnoser()
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.Note(loc_id, MissingImplInMemberAccessNote, interface.name_id,
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context.GetTypeIdForTypeConstant(type_const_id))
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.Emit();
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} else {
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// TODO: Pass in the expression whose type we are printing.
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CARBON_DIAGNOSTIC(MissingImplInMemberAccess, Error,
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"cannot access member of interface `{0}` in type {1} "
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"that does not implement that interface",
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SemIR::NameId, SemIR::TypeId);
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context.emitter().Emit(loc_id, MissingImplInMemberAccess,
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interface.name_id,
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context.GetTypeIdForTypeConstant(type_const_id));
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}
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return SemIR::InstId::BuiltinError;
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}
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auto member_value_id = context.constant_values().GetConstantInstId(member_id);
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if (!member_value_id.is_valid()) {
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if (member_value_id != SemIR::InstId::BuiltinError) {
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context.TODO(member_id, "non-constant associated entity");
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}
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return SemIR::InstId::BuiltinError;
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}
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auto assoc_entity =
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context.insts().TryGetAs<SemIR::AssociatedEntity>(member_value_id);
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if (!assoc_entity) {
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context.TODO(member_id, "unexpected value for associated entity");
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return SemIR::InstId::BuiltinError;
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}
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// TODO: This produces the type of the associated entity with no value for
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// `Self`. The type `Self` might appear in the type of an associated constant,
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// and if so, we'll need to substitute it here somehow.
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auto subst_type_id = SemIR::GetTypeInSpecific(
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context.sem_ir(), interface_type.specific_id, assoc_type.entity_type_id);
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return context.GetOrAddInst<SemIR::InterfaceWitnessAccess>(
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loc_id, {.type_id = subst_type_id,
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.witness_id = witness_id,
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.index = assoc_entity->index});
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}
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// Performs a member name lookup into the specified scope, including performing
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// impl lookup if necessary. If the scope is invalid, assume an error has
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// already been diagnosed, and return BuiltinError.
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static auto LookupMemberNameInScope(Context& context, SemIR::LocId loc_id,
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SemIR::InstId /*base_id*/,
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SemIR::NameId name_id,
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SemIR::ConstantId name_scope_const_id,
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LookupScope lookup_scope) -> SemIR::InstId {
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LookupResult result = {.specific_id = SemIR::SpecificId::Invalid,
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.inst_id = SemIR::InstId::BuiltinError};
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if (lookup_scope.name_scope_id.is_valid()) {
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AccessInfo access_info = {
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.constant_id = name_scope_const_id,
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.highest_allowed_access =
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GetHighestAllowedAccess(context, loc_id, name_scope_const_id),
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};
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result = context.LookupQualifiedName(loc_id, name_id, lookup_scope,
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/*required=*/true, access_info);
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if (!result.inst_id.is_valid()) {
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return SemIR::InstId::BuiltinError;
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}
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}
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// TODO: This duplicates the work that HandleNameAsExpr does. Factor this out.
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auto inst = context.insts().Get(result.inst_id);
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auto type_id = SemIR::GetTypeInSpecific(context.sem_ir(), result.specific_id,
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inst.type_id());
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CARBON_CHECK(type_id.is_valid(), "Missing type for member {0}", inst);
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// If the named entity has a constant value that depends on its specific,
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// store the specific too.
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if (result.specific_id.is_valid() &&
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context.constant_values().Get(result.inst_id).is_symbolic()) {
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result.inst_id = context.GetOrAddInst<SemIR::SpecificConstant>(
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loc_id, {.type_id = type_id,
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.inst_id = result.inst_id,
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.specific_id = result.specific_id});
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}
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// TODO: Use a different kind of instruction that also references the
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// `base_id` so that `SemIR` consumers can find it.
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auto member_id = context.GetOrAddInst<SemIR::NameRef>(
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loc_id,
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{.type_id = type_id, .name_id = name_id, .value_id = result.inst_id});
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// If member name lookup finds an associated entity name, and the scope is not
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// a facet type, perform impl lookup.
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//
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// TODO: We need to do this as part of searching extended scopes, because a
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// lookup that finds an associated entity and also finds the corresponding
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// impl member is not supposed to be treated as ambiguous.
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if (auto assoc_type =
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context.types().TryGetAs<SemIR::AssociatedEntityType>(type_id)) {
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if (ScopeNeedsImplLookup(context, lookup_scope)) {
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member_id = PerformImplLookup(context, loc_id, name_scope_const_id,
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*assoc_type, member_id);
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}
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}
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return member_id;
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}
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// Performs the instance binding step in member access. If the found member is a
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// field, forms a class member access. If the found member is an instance
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// method, forms a bound method. Otherwise, the member is returned unchanged.
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static auto PerformInstanceBinding(Context& context, SemIR::LocId loc_id,
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SemIR::InstId base_id,
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SemIR::InstId member_id) -> SemIR::InstId {
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auto member_type_id = context.insts().Get(member_id).type_id();
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CARBON_KIND_SWITCH(context.types().GetAsInst(member_type_id)) {
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case CARBON_KIND(SemIR::UnboundElementType unbound_element_type): {
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// Convert the base to the type of the element if necessary.
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base_id = ConvertToValueOrRefOfType(context, loc_id, base_id,
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unbound_element_type.class_type_id);
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// Find the specified element, which could be either a field or a base
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// class, and build an element access expression.
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auto element_id = context.constant_values().GetConstantInstId(member_id);
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CARBON_CHECK(element_id.is_valid(),
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"Non-constant value {0} of unbound element type",
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context.insts().Get(member_id));
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auto index = GetClassElementIndex(context, element_id);
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auto access_id = context.GetOrAddInst<SemIR::ClassElementAccess>(
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loc_id, {.type_id = unbound_element_type.element_type_id,
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.base_id = base_id,
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.index = index});
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if (SemIR::GetExprCategory(context.sem_ir(), base_id) ==
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SemIR::ExprCategory::Value &&
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SemIR::GetExprCategory(context.sem_ir(), access_id) !=
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SemIR::ExprCategory::Value) {
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// Class element access on a value expression produces an ephemeral
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// reference if the class's value representation is a pointer to the
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// object representation. Add a value binding in that case so that the
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// expression category of the result matches the expression category of
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// the base.
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access_id = ConvertToValueExpr(context, access_id);
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}
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return access_id;
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}
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case CARBON_KIND(SemIR::FunctionType fn_type): {
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if (IsInstanceMethod(context.sem_ir(), fn_type.function_id)) {
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return context.GetOrAddInst<SemIR::BoundMethod>(
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loc_id, {.type_id = context.GetBuiltinType(
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SemIR::BuiltinInstKind::BoundMethodType),
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.object_id = base_id,
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.function_id = member_id});
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}
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[[fallthrough]];
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}
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default:
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// Not an instance member: no instance binding.
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return member_id;
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}
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}
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// Validates that the index (required to be an IntValue) is valid within the
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// tuple size. Returns the index on success, or nullptr on failure.
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static auto ValidateTupleIndex(Context& context, SemIR::LocId loc_id,
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SemIR::InstId operand_inst_id,
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SemIR::IntValue index_inst, int size)
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-> const llvm::APInt* {
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const auto& index_val = context.ints().Get(index_inst.int_id);
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if (index_val.uge(size)) {
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CARBON_DIAGNOSTIC(TupleIndexOutOfBounds, Error,
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"tuple element index `{0}` is past the end of type {1}",
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TypedInt, TypeOfInstId);
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context.emitter().Emit(loc_id, TupleIndexOutOfBounds,
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{.type = index_inst.type_id, .value = index_val},
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operand_inst_id);
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return nullptr;
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}
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return &index_val;
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}
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auto PerformMemberAccess(Context& context, SemIR::LocId loc_id,
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SemIR::InstId base_id, SemIR::NameId name_id)
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-> SemIR::InstId {
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// If the base is a name scope, such as a class or namespace, perform lookup
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// into that scope.
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if (auto base_const_id = context.constant_values().Get(base_id);
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base_const_id.is_constant()) {
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if (auto lookup_scope = GetAsLookupScope(context, loc_id, base_const_id)) {
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return LookupMemberNameInScope(context, loc_id, base_id, name_id,
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base_const_id, *lookup_scope);
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}
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}
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// If the base isn't a scope, it must have a complete type.
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auto base_type_id = context.insts().Get(base_id).type_id();
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if (!context.TryToCompleteType(base_type_id, [&] {
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CARBON_DIAGNOSTIC(IncompleteTypeInMemberAccess, Error,
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"member access into object of incomplete type {0}",
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TypeOfInstId);
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return context.emitter().Build(base_id, IncompleteTypeInMemberAccess,
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base_id);
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})) {
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return SemIR::InstId::BuiltinError;
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}
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// Materialize a temporary for the base expression if necessary.
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base_id = ConvertToValueOrRefExpr(context, base_id);
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base_type_id = context.insts().Get(base_id).type_id();
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auto base_type_const_id = context.types().GetConstantId(base_type_id);
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// Find the scope corresponding to the base type.
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auto lookup_scope = GetAsLookupScope(context, loc_id, base_type_const_id);
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if (!lookup_scope) {
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// The base type is not a name scope. Try some fallback options.
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if (auto struct_type = context.insts().TryGetAs<SemIR::StructType>(
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context.constant_values().GetInstId(base_type_const_id))) {
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// TODO: Do we need to optimize this with a lookup table for O(1)?
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for (auto [i, field] : llvm::enumerate(
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context.struct_type_fields().Get(struct_type->fields_id))) {
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if (name_id == field.name_id) {
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// TODO: Model this as producing a lookup result, and do instance
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// binding separately. Perhaps a struct type should be a name scope.
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return context.GetOrAddInst<SemIR::StructAccess>(
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loc_id, {.type_id = field.type_id,
|
|
.struct_id = base_id,
|
|
.index = SemIR::ElementIndex(i)});
|
|
}
|
|
}
|
|
CARBON_DIAGNOSTIC(QualifiedExprNameNotFound, Error,
|
|
"type {0} does not have a member `{1}`", TypeOfInstId,
|
|
SemIR::NameId);
|
|
context.emitter().Emit(loc_id, QualifiedExprNameNotFound, base_id,
|
|
name_id);
|
|
return SemIR::InstId::BuiltinError;
|
|
}
|
|
|
|
if (base_type_id != SemIR::TypeId::Error) {
|
|
CARBON_DIAGNOSTIC(QualifiedExprUnsupported, Error,
|
|
"type {0} does not support qualified expressions",
|
|
TypeOfInstId);
|
|
context.emitter().Emit(loc_id, QualifiedExprUnsupported, base_id);
|
|
}
|
|
return SemIR::InstId::BuiltinError;
|
|
}
|
|
|
|
// Perform lookup into the base type.
|
|
auto member_id = LookupMemberNameInScope(context, loc_id, base_id, name_id,
|
|
base_type_const_id, *lookup_scope);
|
|
|
|
// Perform instance binding if we found an instance member.
|
|
member_id = PerformInstanceBinding(context, loc_id, base_id, member_id);
|
|
|
|
return member_id;
|
|
}
|
|
|
|
auto PerformCompoundMemberAccess(
|
|
Context& context, SemIR::LocId loc_id, SemIR::InstId base_id,
|
|
SemIR::InstId member_expr_id,
|
|
Context::BuildDiagnosticFn missing_impl_diagnoser) -> SemIR::InstId {
|
|
// Materialize a temporary for the base expression if necessary.
|
|
base_id = ConvertToValueOrRefExpr(context, base_id);
|
|
auto base_type_id = context.insts().Get(base_id).type_id();
|
|
auto base_type_const_id = context.types().GetConstantId(base_type_id);
|
|
|
|
auto member_id = member_expr_id;
|
|
auto member = context.insts().Get(member_id);
|
|
|
|
// If the member expression names an associated entity, impl lookup is always
|
|
// performed using the type of the base expression.
|
|
if (auto assoc_type = context.types().TryGetAs<SemIR::AssociatedEntityType>(
|
|
member.type_id())) {
|
|
member_id =
|
|
PerformImplLookup(context, loc_id, base_type_const_id, *assoc_type,
|
|
member_id, missing_impl_diagnoser);
|
|
} else if (context.insts().Is<SemIR::TupleType>(
|
|
context.constant_values().GetInstId(base_type_const_id))) {
|
|
return PerformTupleAccess(context, loc_id, base_id, member_expr_id);
|
|
}
|
|
|
|
// Perform instance binding if we found an instance member.
|
|
member_id = PerformInstanceBinding(context, loc_id, base_id, member_id);
|
|
|
|
// If we didn't perform impl lookup or instance binding, that's an error
|
|
// because the base expression is not used for anything.
|
|
if (member_id == member_expr_id && member.type_id() != SemIR::TypeId::Error) {
|
|
CARBON_DIAGNOSTIC(CompoundMemberAccessDoesNotUseBase, Error,
|
|
"member name of type {0} in compound member access is "
|
|
"not an instance member or an interface member",
|
|
TypeOfInstId);
|
|
context.emitter().Emit(loc_id, CompoundMemberAccessDoesNotUseBase,
|
|
member_id);
|
|
}
|
|
|
|
return member_id;
|
|
}
|
|
|
|
auto PerformTupleAccess(Context& context, SemIR::LocId loc_id,
|
|
SemIR::InstId tuple_inst_id,
|
|
SemIR::InstId index_inst_id) -> SemIR::InstId {
|
|
tuple_inst_id = ConvertToValueOrRefExpr(context, tuple_inst_id);
|
|
auto tuple_type_id = context.insts().Get(tuple_inst_id).type_id();
|
|
|
|
auto tuple_type = context.types().TryGetAs<SemIR::TupleType>(tuple_type_id);
|
|
if (!tuple_type) {
|
|
CARBON_DIAGNOSTIC(TupleIndexOnANonTupleType, Error,
|
|
"type {0} does not support tuple indexing; only "
|
|
"tuples can be indexed that way",
|
|
TypeOfInstId);
|
|
context.emitter().Emit(loc_id, TupleIndexOnANonTupleType, tuple_inst_id);
|
|
return SemIR::InstId::BuiltinError;
|
|
}
|
|
|
|
SemIR::TypeId element_type_id = SemIR::TypeId::Error;
|
|
auto index_node_id = context.insts().GetLocId(index_inst_id);
|
|
index_inst_id = ConvertToValueOfType(
|
|
context, index_node_id, index_inst_id,
|
|
context.GetBuiltinType(SemIR::BuiltinInstKind::IntType));
|
|
auto index_const_id = context.constant_values().Get(index_inst_id);
|
|
if (index_const_id == SemIR::ConstantId::Error) {
|
|
return SemIR::InstId::BuiltinError;
|
|
} else if (!index_const_id.is_template()) {
|
|
// TODO: Decide what to do if the index is a symbolic constant.
|
|
CARBON_DIAGNOSTIC(TupleIndexNotConstant, Error,
|
|
"tuple index must be a constant");
|
|
context.emitter().Emit(loc_id, TupleIndexNotConstant);
|
|
return SemIR::InstId::BuiltinError;
|
|
}
|
|
|
|
auto index_literal = context.insts().GetAs<SemIR::IntValue>(
|
|
context.constant_values().GetInstId(index_const_id));
|
|
auto type_block = context.type_blocks().Get(tuple_type->elements_id);
|
|
const auto* index_val = ValidateTupleIndex(context, loc_id, tuple_inst_id,
|
|
index_literal, type_block.size());
|
|
if (!index_val) {
|
|
return SemIR::InstId::BuiltinError;
|
|
}
|
|
|
|
// TODO: Handle the case when `index_val->getZExtValue()` has too many bits.
|
|
element_type_id = type_block[index_val->getZExtValue()];
|
|
auto tuple_index = SemIR::ElementIndex(index_val->getZExtValue());
|
|
|
|
return context.GetOrAddInst<SemIR::TupleAccess>(loc_id,
|
|
{.type_id = element_type_id,
|
|
.tuple_id = tuple_inst_id,
|
|
.index = tuple_index});
|
|
}
|
|
|
|
} // namespace Carbon::Check
|