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https://github.com/carbon-language/carbon-lang.git
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Richard Smith
3cb769a053
As discussed in toolchain meeting, we want to avoid overloading the meaning of "instance", and "specific" was the best name we found. It's a little unorthodox and inventive, but hopefully over time will become as unsurprising as the term "generic" is.
102 lines
3.5 KiB
C++
102 lines
3.5 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/generic.h"
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#include "toolchain/sem_ir/file.h"
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namespace Carbon::SemIR {
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class SpecificStore::KeyContext : public TranslatingKeyContext<KeyContext> {
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public:
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// A lookup key for a specific.
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struct Key {
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GenericId generic_id;
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InstBlockId args_id;
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friend auto operator==(const Key&, const Key&) -> bool = default;
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};
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explicit KeyContext(llvm::ArrayRef<Specific> specifics)
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: specifics_(specifics) {}
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auto TranslateKey(SpecificId id) const -> Key {
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const auto& specific = specifics_[id.index];
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return {.generic_id = specific.generic_id, .args_id = specific.args_id};
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}
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private:
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llvm::ArrayRef<Specific> specifics_;
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};
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auto SpecificStore::GetOrAdd(GenericId generic_id, InstBlockId args_id)
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-> SpecificId {
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return lookup_table_
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.Insert(
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KeyContext::Key{.generic_id = generic_id, .args_id = args_id},
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[&] {
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return specifics_.Add(
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{.generic_id = generic_id, .args_id = args_id});
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},
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KeyContext(specifics_.array_ref()))
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.key();
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}
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auto SpecificStore::CollectMemUsage(MemUsage& mem_usage,
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llvm::StringRef label) const -> void {
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mem_usage.Collect(MemUsage::ConcatLabel(label, "specifics_"), specifics_);
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mem_usage.Add(MemUsage::ConcatLabel(label, "lookup_table_"), lookup_table_,
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KeyContext(specifics_.array_ref()));
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}
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auto GetConstantInSpecific(const File& sem_ir, SpecificId specific_id,
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ConstantId const_id) -> ConstantId {
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if (!const_id.is_symbolic()) {
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// Type does not depend on a generic parameter.
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return const_id;
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}
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const auto& symbolic = sem_ir.constant_values().GetSymbolicConstant(const_id);
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if (!symbolic.generic_id.is_valid()) {
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// Constant is an abstract symbolic constant, not associated with some
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// particular generic.
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return const_id;
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}
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if (!specific_id.is_valid()) {
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// TODO: We have a generic constant but no specific. Investigate whether we
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// can CHECK-fail here. For now, produce the canonical value of the
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// constant.
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return sem_ir.constant_values().Get(symbolic.inst_id);
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}
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const auto& specific = sem_ir.specifics().Get(specific_id);
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if (specific.generic_id != symbolic.generic_id) {
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// TODO: Given an specific for the wrong generic. If the symbolic constant
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// is from an enclosing generic, take the value from the corresponding
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// specific. Otherwise, CHECK-fail.
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return sem_ir.constant_values().Get(symbolic.inst_id);
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}
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auto value_block_id = specific.GetValueBlock(symbolic.index.region());
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CARBON_CHECK(value_block_id.is_valid())
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<< "Queried region of " << specific_id << " before it was resolved.";
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return sem_ir.constant_values().Get(
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sem_ir.inst_blocks().Get(value_block_id)[symbolic.index.index()]);
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}
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auto GetConstantValueInSpecific(const File& sem_ir, SpecificId specific_id,
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InstId inst_id) -> ConstantId {
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return GetConstantInSpecific(sem_ir, specific_id,
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sem_ir.constant_values().Get(inst_id));
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}
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auto GetTypeInSpecific(const File& sem_ir, SpecificId specific_id,
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TypeId type_id) -> TypeId {
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return TypeId::ForTypeConstant(GetConstantInSpecific(
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sem_ir, specific_id, sem_ir.types().GetConstantId(type_id)));
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}
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} // namespace Carbon::SemIR
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