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| 14 | pmbaty | 1 | //===-- llvm/MC/MCValue.h - MCValue class -----------------------*- C++ -*-===// |
| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | // |
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| 9 | // This file contains the declaration of the MCValue class. |
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| 10 | // |
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| 11 | //===----------------------------------------------------------------------===// |
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| 12 | |||
| 13 | #ifndef LLVM_MC_MCVALUE_H |
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| 14 | #define LLVM_MC_MCVALUE_H |
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| 15 | |||
| 16 | #include "llvm/MC/MCExpr.h" |
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| 17 | #include "llvm/Support/DataTypes.h" |
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| 18 | |||
| 19 | namespace llvm { |
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| 20 | class raw_ostream; |
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| 21 | |||
| 22 | /// This represents an "assembler immediate". |
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| 23 | /// |
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| 24 | /// In its most general form, this can hold ":Kind:(SymbolA - SymbolB + |
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| 25 | /// imm64)". Not all targets supports relocations of this general form, but we |
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| 26 | /// need to represent this anyway. |
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| 27 | /// |
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| 28 | /// In general both SymbolA and SymbolB will also have a modifier |
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| 29 | /// analogous to the top-level Kind. Current targets are not expected |
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| 30 | /// to make use of both though. The choice comes down to whether |
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| 31 | /// relocation modifiers apply to the closest symbol or the whole |
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| 32 | /// expression. |
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| 33 | /// |
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| 34 | /// Note that this class must remain a simple POD value class, because we need |
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| 35 | /// it to live in unions etc. |
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| 36 | class MCValue { |
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| 37 | const MCSymbolRefExpr *SymA = nullptr, *SymB = nullptr; |
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| 38 | int64_t Cst = 0; |
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| 39 | uint32_t RefKind = 0; |
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| 40 | |||
| 41 | public: |
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| 42 | MCValue() = default; |
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| 43 | int64_t getConstant() const { return Cst; } |
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| 44 | const MCSymbolRefExpr *getSymA() const { return SymA; } |
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| 45 | const MCSymbolRefExpr *getSymB() const { return SymB; } |
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| 46 | uint32_t getRefKind() const { return RefKind; } |
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| 47 | |||
| 48 | /// Is this an absolute (as opposed to relocatable) value. |
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| 49 | bool isAbsolute() const { return !SymA && !SymB; } |
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| 50 | |||
| 51 | /// Print the value to the stream \p OS. |
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| 52 | void print(raw_ostream &OS) const; |
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| 53 | |||
| 54 | /// Print the value to stderr. |
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| 55 | void dump() const; |
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| 56 | |||
| 57 | MCSymbolRefExpr::VariantKind getAccessVariant() const; |
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| 58 | |||
| 59 | static MCValue get(const MCSymbolRefExpr *SymA, |
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| 60 | const MCSymbolRefExpr *SymB = nullptr, |
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| 61 | int64_t Val = 0, uint32_t RefKind = 0) { |
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| 62 | MCValue R; |
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| 63 | R.Cst = Val; |
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| 64 | R.SymA = SymA; |
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| 65 | R.SymB = SymB; |
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| 66 | R.RefKind = RefKind; |
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| 67 | return R; |
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| 68 | } |
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| 69 | |||
| 70 | static MCValue get(int64_t Val) { |
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| 71 | MCValue R; |
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| 72 | R.Cst = Val; |
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| 73 | R.SymA = nullptr; |
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| 74 | R.SymB = nullptr; |
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| 75 | R.RefKind = 0; |
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| 76 | return R; |
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| 77 | } |
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| 78 | |||
| 79 | }; |
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| 80 | |||
| 81 | } // end namespace llvm |
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| 82 | |||
| 83 | #endif |