mirror of
https://github.com/carbon-language/carbon-lang.git
synced 2026-11-15 22:28:14 +00:00
Nicholas Bishop
2e21255855
This allows a generic class to inherit from a virtual C++ class as long as the subclass doesn't override any methods. See toolchain/lower/testdata/interop/cpp/class/import/inherit.carbon for a working example. The TODO in `CheckCompleteClassType` is now in `CarbonExternalASTSource::CompleteType`, and only triggers if virtual function thunks need to be defined. A fix in `FileContext::BuildVtable` is also needed: when looking up the clang decl associated with the vtable, if the class is generic then the `ClassTemplateSpecializationDecl` associated with the specific is needed. This required adding `ConstantStore::Get`, since only `const` access is allowed during lowering.
98 lines
3.7 KiB
C++
98 lines
3.7 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/sem_ir/constant.h"
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#include "toolchain/base/value_store_impl.h"
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#include "toolchain/sem_ir/file.h"
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namespace Carbon::SemIR {
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auto ConstantStore::GetOrAdd(Inst inst, ConstantDependence dependence)
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-> ConstantId {
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auto result = map_.Insert(inst, [&] {
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auto inst_id = sem_ir_->insts().AddInNoBlock(LocIdAndInst::NoLoc(inst));
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ConstantId const_id = ConstantId::None;
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if (dependence == ConstantDependence::None) {
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const_id = ConstantId::ForConcreteConstant(inst_id);
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} else {
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// The instruction in the constants store is an abstract symbolic
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// constant, not associated with any particular generic.
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SymbolicConstant symbolic_constant = {.inst_id = inst_id,
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.generic_id = GenericId::None,
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.index = GenericInstIndex::None,
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.dependence = dependence};
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const_id =
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sem_ir_->constant_values().AddSymbolicConstant(symbolic_constant);
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}
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sem_ir_->constant_values().Set(inst_id, const_id);
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constants_.push_back(inst_id);
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return const_id;
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});
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CARBON_CHECK(result.value() != ConstantId::None);
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CARBON_CHECK(
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result.value().is_symbolic() == (dependence != ConstantDependence::None),
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"Constant {0} registered as both symbolic and concrete constant.", inst);
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return result.value();
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}
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auto ConstantStore::Get(Inst inst) const -> ConstantId {
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auto result = map_.Lookup(inst);
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CARBON_CHECK(result);
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return result.value();
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}
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auto GetInstWithConstantValue(const File& file, ConstantId const_id) -> InstId {
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if (!const_id.has_value() || !const_id.is_constant()) {
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return InstId::None;
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}
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// For concrete constants, the corresponding instruction has the desired
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// constant value.
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if (!const_id.is_symbolic()) {
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return file.constant_values().GetInstId(const_id);
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}
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// For unattached symbolic constants, the corresponding instruction has the
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// desired constant value.
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const auto& symbolic_const =
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file.constant_values().GetSymbolicConstant(const_id);
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if (!symbolic_const.generic_id.has_value()) {
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return file.constant_values().GetInstId(const_id);
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}
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// For attached symbolic constants, pick the corresponding instruction out of
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// the eval block for the generic.
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const auto& generic = file.generics().Get(symbolic_const.generic_id);
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auto block = generic.GetEvalBlock(symbolic_const.index.region());
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return file.inst_blocks().Get(block)[symbolic_const.index.index()];
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}
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auto ConstantValueStore::OutputYaml(bool include_singletons) const
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-> Yaml::OutputMapping {
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return Yaml::OutputMapping([&, include_singletons](
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Yaml::OutputMapping::Map map) {
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map.Add("values", Yaml::OutputMapping([&](Yaml::OutputMapping::Map map) {
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for (auto [id, value] : values_.enumerate()) {
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if (!include_singletons && IsSingletonInstId(id)) {
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continue;
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}
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if (!value.has_value() || value.is_constant()) {
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map.Add(PrintToString(id), Yaml::OutputScalar(value));
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}
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}
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}));
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map.Add("symbolic_constants", symbolic_constants_.OutputYaml());
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});
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}
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} // namespace Carbon::SemIR
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namespace Carbon {
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template class ValueStore<SemIR::InstId, SemIR::ConstantId,
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Tag<SemIR::CheckIRId>>;
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template class ValueStore<SemIR::ConstantId::SymbolicId,
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SemIR::SymbolicConstant, Tag<SemIR::CheckIRId>>;
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} // namespace Carbon
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