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// SPDX-License-Identifier: GPL-3.0-or-later
#ifndef RCC_CODEGEN_GLOBALOBJECT_H
#define RCC_CODEGEN_GLOBALOBJECT_H
#include "rcc/CodeGen/GenericConstant.h"
#include "rcc/CodeGen/MachineIRTypes.h"
#include "rcc/CodeGen/TargetConstant.h"
#include "rcc/Support/Error.h"
#include <cstddef>
#include <cstdint>
#include <memory>
#include <optional>
#include <string>
#include <utility>
#include <variant>
#include <vector>
namespace rcc {
class GlobalInitializer;
using GlobalInitializerRef = std::shared_ptr<const GlobalInitializer>;
struct GlobalZeroFill final {
std::uint64_t Size = 0;
};
struct GlobalRepeatedInitializer final {
std::uint64_t Count = 0;
GlobalInitializerRef Value;
};
struct GlobalAggregateInitializer final {
std::vector<GlobalInitializerRef> Elements;
};
struct GlobalSymbolAddress final {
std::string Symbol;
std::int64_t Addend = 0;
std::uint8_t Size = 8;
std::uint32_t TargetFlags = 0;
};
struct GlobalSymbolDifference final {
std::string Minuend;
std::string Subtrahend;
std::int64_t Addend = 0;
std::uint8_t Size = 8;
};
struct GlobalAlignmentPadding final {
std::uint64_t Size = 0;
std::uint8_t Fill = 0;
};
struct GlobalUndefinedStorage final {
std::uint64_t Size = 0;
};
class GlobalInitializer final {
public:
enum class Kind : std::uint8_t {
Invalid,
Integer,
Floating,
Bytes,
ZeroFill,
Repeated,
Aggregate,
SymbolAddress,
SymbolDifference,
Target,
AlignmentPadding,
UndefinedStorage,
};
GlobalInitializer() = default;
GlobalInitializer(const GlobalInitializer &) = delete;
GlobalInitializer &operator=(const GlobalInitializer &) = delete;
GlobalInitializer(GlobalInitializer &&) noexcept = default;
GlobalInitializer &operator=(GlobalInitializer &&) noexcept = default;
~GlobalInitializer() = default;
[[nodiscard]] static GlobalInitializer integer(APInt Value);
[[nodiscard]] static GlobalInitializer floating(APFloat Value);
[[nodiscard]] static Expected<GlobalInitializer> bytes(std::vector<std::byte> Value);
[[nodiscard]] static Expected<GlobalInitializer> zeroFill(std::uint64_t Size);
[[nodiscard]] static Expected<GlobalInitializer> repeated(std::uint64_t Count,
GlobalInitializer Value);
[[nodiscard]] static Expected<GlobalInitializer>
aggregate(std::vector<GlobalInitializer> Elements);
[[nodiscard]] static Expected<GlobalInitializer> symbolAddress(GlobalSymbolAddress Value);
[[nodiscard]] static Expected<GlobalInitializer> symbolDifference(GlobalSymbolDifference Value);
[[nodiscard]] static Expected<GlobalInitializer> target(TargetConstant Value);
[[nodiscard]] static Expected<GlobalInitializer> alignmentPadding(std::uint64_t Size,
std::uint8_t Fill = 0);
[[nodiscard]] static Expected<GlobalInitializer> undefinedStorage(std::uint64_t Size);
[[nodiscard]] Kind kind() const noexcept;
template <typename ValueT> [[nodiscard]] const ValueT *getIf() const noexcept {
return std::get_if<ValueT>(&Storage);
}
[[nodiscard]] Expected<void> verify(std::size_t MaximumDepth = 1024) const;
[[nodiscard]] Expected<std::uint64_t> storageSize(std::size_t MaximumDepth = 1024) const;
private:
using StorageT =
std::variant<std::monostate, APInt, APFloat, std::vector<std::byte>, GlobalZeroFill,
GlobalRepeatedInitializer, GlobalAggregateInitializer, GlobalSymbolAddress,
GlobalSymbolDifference, TargetConstant, GlobalAlignmentPadding,
GlobalUndefinedStorage>;
explicit GlobalInitializer(StorageT Storage) : Storage(std::move(Storage)) {}
StorageT Storage;
};
enum class GlobalLinkage : std::uint8_t {
External,
AvailableExternally,
LinkOnceAny,
LinkOnceODR,
WeakAny,
WeakODR,
Appending,
Internal,
Private,
ExternalWeak,
Common,
Count,
};
enum class GlobalVisibility : std::uint8_t {
Default,
Hidden,
Protected,
Count,
};
enum class GlobalTLSModel : std::uint8_t {
None,
GeneralDynamic,
LocalDynamic,
InitialExec,
LocalExec,
Count,
};
enum class GlobalUnnamedAddress : std::uint8_t {
None,
Local,
Global,
Count,
};
struct GlobalObjectDesc final {
std::string Symbol;
GenericConstantType ObjectType;
GlobalLinkage Linkage = GlobalLinkage::External;
GlobalVisibility Visibility = GlobalVisibility::Default;
bool DSOLocal = false;
std::optional<std::string> Section;
Alignment Align;
std::uint64_t Size = 0;
std::uint32_t AddressSpace = 0;
GlobalTLSModel TLSModel = GlobalTLSModel::None;
bool ExternallyInitialized = false;
std::optional<std::string> COMDAT;
bool IsConstant = false;
GlobalUnnamedAddress UnnamedAddress = GlobalUnnamedAddress::None;
std::optional<GlobalInitializer> Initializer;
std::vector<std::string> DebugExpressions;
std::optional<OriginID> StableOrigin;
std::uint64_t TargetFlags = 0;
std::vector<std::pair<std::string, std::string>> TargetAttributes;
GlobalObjectDesc() = default;
GlobalObjectDesc(const GlobalObjectDesc &) = delete;
GlobalObjectDesc &operator=(const GlobalObjectDesc &) = delete;
GlobalObjectDesc(GlobalObjectDesc &&) noexcept = default;
GlobalObjectDesc &operator=(GlobalObjectDesc &&) noexcept = default;
~GlobalObjectDesc() = default;
[[nodiscard]] bool isDeclaration() const noexcept {
return !Initializer.has_value() && Linkage != GlobalLinkage::Common;
}
[[nodiscard]] Expected<void> verify() const;
};
} // namespace rcc
#endif // RCC_CODEGEN_GLOBALOBJECT_H
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