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// SPDX-License-Identifier: GPL-3.0-or-later
#ifndef RCC_CODEGEN_TARGETFUNCTIONSTATE_H
#define RCC_CODEGEN_TARGETFUNCTIONSTATE_H
#include "rcc/CodeGen/MachineIRTypes.h"
#include "rcc/Support/Error.h"
#include <concepts>
#include <cstddef>
#include <cstdint>
#include <memory>
#include <optional>
#include <span>
#include <string>
#include <utility>
#include <vector>
namespace rcc {
class MachineFunctionCloneContext;
struct EncodedTargetFunctionState final {
TargetFunctionStateTypeID TypeID;
std::uint32_t Version = 0;
std::vector<std::byte> Payload;
friend bool operator==(const EncodedTargetFunctionState &Left,
const EncodedTargetFunctionState &Right) = default;
};
template <typename ValueT>
concept TargetFunctionStateValue =
std::move_constructible<ValueT> &&
requires(const ValueT &Value, const ValueT &Other,
const MachineFunctionCloneContext &CloneContext, std::uint32_t Version,
std::span<const std::byte> Payload) {
{ ValueT::stableTypeID() } -> std::same_as<TargetFunctionStateTypeID>;
{ ValueT::schemaVersion() } -> std::same_as<std::uint32_t>;
{ Value.verify() } -> std::same_as<Expected<void>>;
{ Value.clone(CloneContext) } -> std::same_as<Expected<ValueT>>;
{ Value.print() } -> std::same_as<std::string>;
{ Value.encode() } -> std::same_as<Expected<std::vector<std::byte>>>;
{ Value == Other } -> std::convertible_to<bool>;
{ ValueT::decode(Version, Payload) } -> std::same_as<Expected<ValueT>>;
};
class TargetFunctionState final {
public:
TargetFunctionState() = default;
TargetFunctionState(const TargetFunctionState &) = delete;
TargetFunctionState &operator=(const TargetFunctionState &) = delete;
TargetFunctionState(TargetFunctionState &&) noexcept;
TargetFunctionState &operator=(TargetFunctionState &&) noexcept;
~TargetFunctionState();
template <TargetFunctionStateValue ValueT>
[[nodiscard]] static Expected<TargetFunctionState> create(ValueT Value) {
if (ValueT::stableTypeID().value() == 0) {
return makeUnexpected(ErrorCode::InvalidArgument,
"target function state TypeID must be nonzero");
}
if (ValueT::schemaVersion() == 0) {
return makeUnexpected(ErrorCode::InvalidArgument,
"target function state schema version must be nonzero");
}
auto Verification = Value.verify();
if (!Verification)
return std::unexpected(Verification.error());
std::unique_ptr<Concept> NewStorage = std::make_unique<Model<ValueT>>(std::move(Value));
return TargetFunctionState(std::move(NewStorage));
}
template <TargetFunctionStateValue ValueT>
[[nodiscard]] static Expected<TargetFunctionState>
decode(const EncodedTargetFunctionState &Encoded) {
if (Encoded.TypeID != ValueT::stableTypeID()) {
return makeUnexpected(
ErrorCode::ParseError,
"encoded target function state TypeID does not match its target schema");
}
if (Encoded.Version == 0) {
return makeUnexpected(ErrorCode::ParseError, "target function state version must be nonzero");
}
auto Value = ValueT::decode(Encoded.Version, Encoded.Payload);
if (!Value)
return std::unexpected(Value.error());
return create<ValueT>(std::move(*Value));
}
[[nodiscard]] bool hasValue() const noexcept {
return Storage != nullptr;
}
[[nodiscard]] std::optional<TargetFunctionStateTypeID> typeID() const noexcept;
[[nodiscard]] std::optional<std::uint32_t> schemaVersion() const noexcept;
[[nodiscard]] Expected<void> verify() const;
[[nodiscard]] Expected<TargetFunctionState>
clone(const MachineFunctionCloneContext &CloneContext) const;
[[nodiscard]] Expected<std::string> print() const;
[[nodiscard]] Expected<EncodedTargetFunctionState> encode() const;
[[nodiscard]] bool equals(const TargetFunctionState &Other) const noexcept;
template <TargetFunctionStateValue ValueT> [[nodiscard]] ValueT *getIf() noexcept {
if (!hasType<ValueT>())
return nullptr;
return &static_cast<Model<ValueT> *>(Storage.get())->value();
}
template <TargetFunctionStateValue ValueT> [[nodiscard]] const ValueT *getIf() const noexcept {
if (!hasType<ValueT>())
return nullptr;
return &static_cast<const Model<ValueT> *>(Storage.get())->value();
}
private:
class Concept {
public:
Concept() = default;
Concept(const Concept &) = delete;
Concept &operator=(const Concept &) = delete;
Concept(Concept &&) = delete;
Concept &operator=(Concept &&) = delete;
virtual ~Concept() = default;
[[nodiscard]] virtual TargetFunctionStateTypeID typeID() const noexcept = 0;
[[nodiscard]] virtual std::uint32_t schemaVersion() const noexcept = 0;
[[nodiscard]] virtual const void *localTypeToken() const noexcept = 0;
[[nodiscard]] virtual Expected<void> verify() const = 0;
[[nodiscard]] virtual Expected<std::unique_ptr<Concept>>
cloneStorage(const MachineFunctionCloneContext &CloneContext) const = 0;
[[nodiscard]] virtual std::string print() const = 0;
[[nodiscard]] virtual Expected<std::vector<std::byte>> encodePayload() const = 0;
[[nodiscard]] virtual bool equals(const Concept &Other) const noexcept = 0;
};
template <typename ValueT> [[nodiscard]] static const void *typeToken() noexcept {
static const std::byte Token{};
return &Token;
}
template <TargetFunctionStateValue ValueT> class Model final : public Concept {
public:
explicit Model(ValueT Value) : Value(std::move(Value)) {}
[[nodiscard]] TargetFunctionStateTypeID typeID() const noexcept override {
return ValueT::stableTypeID();
}
[[nodiscard]] std::uint32_t schemaVersion() const noexcept override {
return ValueT::schemaVersion();
}
[[nodiscard]] const void *localTypeToken() const noexcept override {
return TargetFunctionState::typeToken<ValueT>();
}
[[nodiscard]] Expected<void> verify() const override {
return Value.verify();
}
[[nodiscard]] Expected<std::unique_ptr<Concept>>
cloneStorage(const MachineFunctionCloneContext &CloneContext) const override {
auto Cloned = Value.clone(CloneContext);
if (!Cloned)
return std::unexpected(Cloned.error());
std::unique_ptr<Concept> Result = std::make_unique<Model<ValueT>>(std::move(*Cloned));
return Result;
}
[[nodiscard]] std::string print() const override {
return Value.print();
}
[[nodiscard]] Expected<std::vector<std::byte>> encodePayload() const override {
return Value.encode();
}
[[nodiscard]] bool equals(const Concept &Other) const noexcept override {
if (Other.localTypeToken() != TargetFunctionState::typeToken<ValueT>())
return false;
return Value == static_cast<const Model<ValueT> &>(Other).Value;
}
[[nodiscard]] ValueT &value() noexcept {
return Value;
}
[[nodiscard]] const ValueT &value() const noexcept {
return Value;
}
private:
ValueT Value;
};
explicit TargetFunctionState(std::unique_ptr<Concept> Storage) : Storage(std::move(Storage)) {}
template <TargetFunctionStateValue ValueT> [[nodiscard]] bool hasType() const noexcept {
return Storage != nullptr && Storage->typeID() == ValueT::stableTypeID() &&
Storage->localTypeToken() == typeToken<ValueT>();
}
std::unique_ptr<Concept> Storage;
};
} // namespace rcc
#endif // RCC_CODEGEN_TARGETFUNCTIONSTATE_H
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