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// SPDX-License-Identifier: GPL-3.0-or-later
#ifndef RCC_CODEGEN_MACHINEFUNCTIONATTRIBUTES_H
#define RCC_CODEGEN_MACHINEFUNCTIONATTRIBUTES_H
#include "rcc/CodeGen/MachineIRTypes.h"
#include "rcc/Support/Error.h"
#include <cstdint>
#include <optional>
#include <string_view>
namespace rcc {
enum class MachineFunctionAttribute : std::uint8_t {
ExposesReturnsTwice,
HasWinCFI,
HasFakeUses,
CallsEHReturn,
CallsUnwindInit,
HasEHContTarget,
HasEHScopes,
HasEHFunclets,
IsOutlined,
DebugInstrRef,
TracksDebugUserValues,
Count,
};
[[nodiscard]] std::string_view
getMachineFunctionAttributeName(MachineFunctionAttribute Attribute) noexcept;
class MachineFunctionAttributes final {
public:
constexpr MachineFunctionAttributes() noexcept = default;
[[nodiscard]] static Expected<MachineFunctionAttributes> fromRawFlags(std::uint16_t RawFlags);
[[nodiscard]] constexpr bool has(MachineFunctionAttribute Attribute) const noexcept {
if (!isValidAttribute(Attribute))
return false;
return (Flags & flagFor(Attribute)) != 0;
}
constexpr void set(MachineFunctionAttribute Attribute) noexcept {
if (isValidAttribute(Attribute))
Flags |= flagFor(Attribute);
}
constexpr void clear(MachineFunctionAttribute Attribute) noexcept {
if (isValidAttribute(Attribute))
Flags &= static_cast<std::uint16_t>(~flagFor(Attribute));
}
[[nodiscard]] constexpr std::uint16_t rawFlags() const noexcept {
return Flags;
}
[[nodiscard]] std::optional<Alignment> alignment() const noexcept {
return FunctionAlignment;
}
void setAlignment(Alignment NewAlignment) noexcept {
FunctionAlignment = NewAlignment;
}
void clearAlignment() noexcept {
FunctionAlignment.reset();
}
[[nodiscard]] Expected<void> verify() const;
friend bool operator==(const MachineFunctionAttributes &Left,
const MachineFunctionAttributes &Right) = default;
private:
static constexpr std::uint16_t AttributeCount =
static_cast<std::uint16_t>(MachineFunctionAttribute::Count);
static_assert(AttributeCount < 16);
static constexpr std::uint16_t ValidFlags =
static_cast<std::uint16_t>((std::uint16_t{1} << AttributeCount) - 1);
[[nodiscard]] static constexpr bool
isValidAttribute(MachineFunctionAttribute Attribute) noexcept {
return static_cast<std::uint16_t>(Attribute) < AttributeCount;
}
[[nodiscard]] static constexpr std::uint16_t
flagFor(MachineFunctionAttribute Attribute) noexcept {
return static_cast<std::uint16_t>(std::uint16_t{1} << static_cast<std::uint16_t>(Attribute));
}
std::uint16_t Flags = 0;
std::optional<Alignment> FunctionAlignment;
};
} // namespace rcc
#endif // RCC_CODEGEN_MACHINEFUNCTIONATTRIBUTES_H
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