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//===-- AVRMCExpr.h - AVR specific MC expression classes --------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_AVR_MCEXPR_H
#define LLVM_AVR_MCEXPR_H
#include "llvm/MC/MCExpr.h"
#include "MCTargetDesc/AVRFixupKinds.h"
namespace llvm {
/// A expression in AVR machine code.
class AVRMCExpr : public MCTargetExpr {
public:
/// Specifies the type of an expression.
enum VariantKind {
VK_AVR_None,
VK_AVR_HI8, ///< Corresponds to `hi8()`.
VK_AVR_LO8, ///< Corresponds to `lo8()`.
VK_AVR_HH8, ///< Corresponds to `hlo8() and hh8()`.
VK_AVR_HHI8, ///< Corresponds to `hhi8()`.
VK_AVR_PM_LO8, ///< Corresponds to `pm_lo8()`.
VK_AVR_PM_HI8, ///< Corresponds to `pm_hi8()`.
VK_AVR_PM_HH8, ///< Corresponds to `pm_hh8()`.
VK_AVR_LO8_GS, ///< Corresponds to `lo8(gs())`.
VK_AVR_HI8_GS, ///< Corresponds to `hi8(gs())`.
VK_AVR_GS, ///< Corresponds to `gs()`.
};
public:
/// Creates an AVR machine code expression.
static const AVRMCExpr *create(VariantKind Kind, const MCExpr *Expr,
bool isNegated, MCContext &Ctx);
/// Gets the type of the expression.
VariantKind getKind() const { return Kind; }
/// Gets the name of the expression.
const char *getName() const;
const MCExpr *getSubExpr() const { return SubExpr; }
/// Gets the fixup which corresponds to the expression.
AVR::Fixups getFixupKind() const;
/// Evaluates the fixup as a constant value.
bool evaluateAsConstant(int64_t &Result) const;
bool isNegated() const { return Negated; }
void setNegated(bool negated = true) { Negated = negated; }
void printImpl(raw_ostream &OS, const MCAsmInfo *MAI) const override;
bool evaluateAsRelocatableImpl(MCValue &Res, const MCAsmLayout *Layout,
const MCFixup *Fixup) const override;
void visitUsedExpr(MCStreamer &streamer) const override;
MCFragment *findAssociatedFragment() const override {
return getSubExpr()->findAssociatedFragment();
}
void fixELFSymbolsInTLSFixups(MCAssembler &Asm) const override {}
static bool classof(const MCExpr *E) {
return E->getKind() == MCExpr::Target;
}
public:
static VariantKind getKindByName(StringRef Name);
private:
int64_t evaluateAsInt64(int64_t Value) const;
const VariantKind Kind;
const MCExpr *SubExpr;
bool Negated;
private:
explicit AVRMCExpr(VariantKind Kind, const MCExpr *Expr, bool Negated)
: Kind(Kind), SubExpr(Expr), Negated(Negated) {}
~AVRMCExpr() {}
};
} // end namespace llvm
#endif // LLVM_AVR_MCEXPR_H
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