1//===-- AVRMCExpr.h - AVR specific MC expression classes --------*- C++ -*-===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9#ifndef LLVM_AVR_MCEXPR_H
10#define LLVM_AVR_MCEXPR_H
11
12#include "llvm/MC/MCExpr.h"
13
14#include "MCTargetDesc/AVRFixupKinds.h"
15
16namespace llvm {
17
18/// A expression in AVR machine code.
19class AVRMCExpr : public MCTargetExpr {
20public:
21 /// Specifies the type of an expression.
22 enum VariantKind {
23 VK_AVR_None = 0,
24
25 VK_AVR_HI8, ///< Corresponds to `hi8()`.
26 VK_AVR_LO8, ///< Corresponds to `lo8()`.
27 VK_AVR_HH8, ///< Corresponds to `hlo8() and hh8()`.
28 VK_AVR_HHI8, ///< Corresponds to `hhi8()`.
29
30 VK_AVR_PM, ///< Corresponds to `pm()`, reference to program memory.
31 VK_AVR_PM_LO8, ///< Corresponds to `pm_lo8()`.
32 VK_AVR_PM_HI8, ///< Corresponds to `pm_hi8()`.
33 VK_AVR_PM_HH8, ///< Corresponds to `pm_hh8()`.
34
35 VK_AVR_LO8_GS, ///< Corresponds to `lo8(gs())`.
36 VK_AVR_HI8_GS, ///< Corresponds to `hi8(gs())`.
37 VK_AVR_GS, ///< Corresponds to `gs()`.
38 };
39
40public:
41 /// Creates an AVR machine code expression.
42 static const AVRMCExpr *create(VariantKind Kind, const MCExpr *Expr,
43 bool isNegated, MCContext &Ctx);
44
45 /// Gets the type of the expression.
46 VariantKind getKind() const { return Kind; }
47 /// Gets the name of the expression.
48 const char *getName() const;
49 const MCExpr *getSubExpr() const { return SubExpr; }
50 /// Gets the fixup which corresponds to the expression.
51 AVR::Fixups getFixupKind() const;
52 /// Evaluates the fixup as a constant value.
53 bool evaluateAsConstant(int64_t &Result) const;
54
55 bool isNegated() const { return Negated; }
56 void setNegated(bool negated = true) { Negated = negated; }
57
58 void printImpl(raw_ostream &OS, const MCAsmInfo *MAI) const override;
59 bool evaluateAsRelocatableImpl(MCValue &Res, const MCAssembler *Asm,
60 const MCFixup *Fixup) const override;
61
62 void visitUsedExpr(MCStreamer &streamer) const override;
63
64 MCFragment *findAssociatedFragment() const override {
65 return getSubExpr()->findAssociatedFragment();
66 }
67
68 void fixELFSymbolsInTLSFixups(MCAssembler &Asm) const override {}
69
70 static bool classof(const MCExpr *E) {
71 return E->getKind() == MCExpr::Target;
72 }
73
74public:
75 static VariantKind getKindByName(StringRef Name);
76
77private:
78 int64_t evaluateAsInt64(int64_t Value) const;
79
80 const VariantKind Kind;
81 const MCExpr *SubExpr;
82 bool Negated;
83
84private:
85 explicit AVRMCExpr(VariantKind Kind, const MCExpr *Expr, bool Negated)
86 : Kind(Kind), SubExpr(Expr), Negated(Negated) {}
87 ~AVRMCExpr() = default;
88};
89
90} // end namespace llvm
91
92#endif // LLVM_AVR_MCEXPR_H
93