1//===-- RISCVMCExpr.h - RISC-V 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// This file describes RISC-V specific MCExprs, used for modifiers like
10// "%hi" or "%lo" etc.,
11//
12//===----------------------------------------------------------------------===//
13
14#ifndef LLVM_LIB_TARGET_RISCV_MCTARGETDESC_RISCVMCEXPR_H
15#define LLVM_LIB_TARGET_RISCV_MCTARGETDESC_RISCVMCEXPR_H
16
17#include "llvm/MC/MCExpr.h"
18
19namespace llvm {
20
21class StringRef;
22
23class RISCVMCExpr : public MCTargetExpr {
24public:
25 enum VariantKind {
26 VK_RISCV_None,
27 VK_RISCV_LO,
28 VK_RISCV_HI,
29 VK_RISCV_PCREL_LO,
30 VK_RISCV_PCREL_HI,
31 VK_RISCV_GOT_HI,
32 VK_RISCV_TPREL_LO,
33 VK_RISCV_TPREL_HI,
34 VK_RISCV_TPREL_ADD,
35 VK_RISCV_TLS_GOT_HI,
36 VK_RISCV_TLS_GD_HI,
37 VK_RISCV_CALL,
38 VK_RISCV_CALL_PLT,
39 VK_RISCV_32_PCREL,
40 VK_RISCV_TLSDESC_HI,
41 VK_RISCV_TLSDESC_LOAD_LO,
42 VK_RISCV_TLSDESC_ADD_LO,
43 VK_RISCV_TLSDESC_CALL,
44 VK_RISCV_Invalid // Must be the last item
45 };
46
47private:
48 const MCExpr *Expr;
49 const VariantKind Kind;
50
51 int64_t evaluateAsInt64(int64_t Value) const;
52
53 explicit RISCVMCExpr(const MCExpr *Expr, VariantKind Kind)
54 : Expr(Expr), Kind(Kind) {}
55
56public:
57 static const RISCVMCExpr *create(const MCExpr *Expr, VariantKind Kind,
58 MCContext &Ctx);
59
60 VariantKind getKind() const { return Kind; }
61
62 const MCExpr *getSubExpr() const { return Expr; }
63
64 /// Get the corresponding PC-relative HI fixup that a VK_RISCV_PCREL_LO
65 /// points to, and optionally the fragment containing it.
66 ///
67 /// \returns nullptr if this isn't a VK_RISCV_PCREL_LO pointing to a
68 /// known PC-relative HI fixup.
69 const MCFixup *getPCRelHiFixup(const MCFragment **DFOut) const;
70
71 void printImpl(raw_ostream &OS, const MCAsmInfo *MAI) const override;
72 bool evaluateAsRelocatableImpl(MCValue &Res, const MCAsmLayout *Layout,
73 const MCFixup *Fixup) const override;
74 void visitUsedExpr(MCStreamer &Streamer) const override;
75 MCFragment *findAssociatedFragment() const override {
76 return getSubExpr()->findAssociatedFragment();
77 }
78
79 void fixELFSymbolsInTLSFixups(MCAssembler &Asm) const override;
80
81 bool evaluateAsConstant(int64_t &Res) const;
82
83 static bool classof(const MCExpr *E) {
84 return E->getKind() == MCExpr::Target;
85 }
86
87 static VariantKind getVariantKindForName(StringRef name);
88 static StringRef getVariantKindName(VariantKind Kind);
89};
90
91} // end namespace llvm.
92
93#endif
94

source code of llvm/lib/Target/RISCV/MCTargetDesc/RISCVMCExpr.h