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// SPDX-License-Identifier: GPL-3.0-or-later
#ifndef RCC_MC_MCEXPR_H
#define RCC_MC_MCEXPR_H
#include "rcc/MC/MCSymbol.h"
#include "rcc/Support/Error.h"
#include <cstddef>
#include <cstdint>
#include <memory>
#include <optional>
#include <variant>
namespace rcc::mc {
class MCExpr;
using MCExprRef = std::shared_ptr<const MCExpr>;
enum class MCUnaryOperator : std::uint8_t {
Plus,
Minus,
BitwiseNot,
LogicalNot,
};
enum class MCBinaryOperator : std::uint8_t {
Add,
Subtract,
Multiply,
Divide,
Modulo,
ShiftLeft,
ShiftRight,
BitwiseAnd,
BitwiseOr,
BitwiseXor,
LogicalAnd,
LogicalOr,
Equal,
NotEqual,
Less,
LessEqual,
Greater,
GreaterEqual,
};
struct MCSymbolRefExpr final {
MCSymbolRef Symbol;
};
struct MCUnaryExpr final {
MCUnaryOperator Operator = MCUnaryOperator::Plus;
MCExprRef Operand;
};
struct MCBinaryExpr final {
MCBinaryOperator Operator = MCBinaryOperator::Add;
MCExprRef Left;
MCExprRef Right;
};
struct MCTargetExpr final {
std::uint32_t Kind = 0;
MCExprRef Operand;
};
class MCExpr final {
public:
enum class Kind : std::uint8_t {
Constant,
SymbolRef,
Unary,
Binary,
Target,
};
[[nodiscard]] static MCExprRef constant(std::int64_t Value);
[[nodiscard]] static Expected<MCExprRef> symbol(MCSymbolRef Symbol);
[[nodiscard]] static Expected<MCExprRef> unary(MCUnaryOperator Operator, MCExprRef Operand);
[[nodiscard]] static Expected<MCExprRef> binary(MCBinaryOperator Operator, MCExprRef Left,
MCExprRef Right);
[[nodiscard]] static Expected<MCExprRef> target(std::uint32_t Kind, MCExprRef Operand);
[[nodiscard]] Kind kind() const noexcept {
return ExpressionKind;
}
template <typename ValueT> [[nodiscard]] const ValueT *getIf() const noexcept {
return std::get_if<ValueT>(&Storage);
}
[[nodiscard]] Expected<void> verify(std::size_t MaximumDepth = 256) const;
[[nodiscard]] std::optional<std::int64_t> evaluateAbsolute() const noexcept;
private:
using StorageT =
std::variant<std::int64_t, MCSymbolRefExpr, MCUnaryExpr, MCBinaryExpr, MCTargetExpr>;
MCExpr(Kind ExpressionKind, StorageT Storage)
: ExpressionKind(ExpressionKind), Storage(std::move(Storage)) {}
Kind ExpressionKind;
StorageT Storage;
};
} // namespace rcc::mc
#endif // RCC_MC_MCEXPR_H
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