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annotate include/llvm/MC/MCValue.h @ 92:8a1cd0ffee6e

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Create prototype declaration automatically if prototype was not found when parsing continuation arguments.
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Fri, 17 Apr 2015 13:54:34 +0900
parents 60c9769439b8
children afa8332a0e37
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1 //===-- llvm/MC/MCValue.h - MCValue class -----------------------*- C++ -*-===//
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2 //
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3 // The LLVM Compiler Infrastructure
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4 //
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5 // This file is distributed under the University of Illinois Open Source
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6 // License. See LICENSE.TXT for details.
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7 //
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8 //===----------------------------------------------------------------------===//
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9 //
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10 // This file contains the declaration of the MCValue class.
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11 //
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12 //===----------------------------------------------------------------------===//
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13
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14 #ifndef LLVM_MC_MCVALUE_H
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15 #define LLVM_MC_MCVALUE_H
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16
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17 #include "llvm/MC/MCExpr.h"
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18 #include "llvm/MC/MCSymbol.h"
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19 #include "llvm/Support/DataTypes.h"
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20 #include <cassert>
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21
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22 namespace llvm {
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23 class MCAsmInfo;
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24 class raw_ostream;
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25
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26 /// MCValue - This represents an "assembler immediate". In its most
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27 /// general form, this can hold ":Kind:(SymbolA - SymbolB + imm64)".
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28 /// Not all targets supports relocations of this general form, but we
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29 /// need to represent this anyway.
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30 ///
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31 /// In general both SymbolA and SymbolB will also have a modifier
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32 /// analogous to the top-level Kind. Current targets are not expected
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33 /// to make use of both though. The choice comes down to whether
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34 /// relocation modifiers apply to the closest symbol or the whole
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35 /// expression.
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36 ///
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37 /// In the general form, SymbolB can only be defined if SymbolA is, and both
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38 /// must be in the same (non-external) section. The latter constraint is not
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39 /// enforced, since a symbol's section may not be known at construction.
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40 ///
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41 /// Note that this class must remain a simple POD value class, because we need
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42 /// it to live in unions etc.
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43 class MCValue {
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44 const MCSymbolRefExpr *SymA, *SymB;
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45 int64_t Cst;
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46 uint32_t RefKind;
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47 public:
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48
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49 int64_t getConstant() const { return Cst; }
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50 const MCSymbolRefExpr *getSymA() const { return SymA; }
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51 const MCSymbolRefExpr *getSymB() const { return SymB; }
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52 uint32_t getRefKind() const { return RefKind; }
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53
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54 /// isAbsolute - Is this an absolute (as opposed to relocatable) value.
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55 bool isAbsolute() const { return !SymA && !SymB; }
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56
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57 /// print - Print the value to the stream \p OS.
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58 void print(raw_ostream &OS) const;
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59
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60 /// dump - Print the value to stderr.
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61 void dump() const;
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62
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63 MCSymbolRefExpr::VariantKind getAccessVariant() const;
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64
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65 static MCValue get(const MCSymbolRefExpr *SymA,
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66 const MCSymbolRefExpr *SymB = nullptr,
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67 int64_t Val = 0, uint32_t RefKind = 0) {
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68 MCValue R;
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69 assert((!SymB || SymA) && "Invalid relocatable MCValue!");
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70 R.Cst = Val;
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71 R.SymA = SymA;
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72 R.SymB = SymB;
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73 R.RefKind = RefKind;
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74 return R;
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75 }
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76
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77 static MCValue get(int64_t Val) {
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78 MCValue R;
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79 R.Cst = Val;
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80 R.SymA = nullptr;
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81 R.SymB = nullptr;
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82 R.RefKind = 0;
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83 return R;
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84 }
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85
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86 };
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87
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88 } // end namespace llvm
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89
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90 #endif