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1 //===-- llvm/GlobalValue.h - Class to represent a global value --*- 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 is a common base class of all globally definable objects. As such,
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11 // it is subclassed by GlobalVariable, GlobalAlias and by Function. This is
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12 // used because you can do certain things with these global objects that you
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13 // can't do to anything else. For example, use the address of one as a
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14 // constant.
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15 //
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16 //===----------------------------------------------------------------------===//
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17
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18 #ifndef LLVM_IR_GLOBALVALUE_H
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19 #define LLVM_IR_GLOBALVALUE_H
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20
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21 #include "llvm/IR/Constant.h"
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22 #include "llvm/IR/DerivedTypes.h"
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83
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23 #include <system_error>
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24
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25 namespace llvm {
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26
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77
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27 class Comdat;
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28 class PointerType;
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29 class Module;
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30
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95
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31 namespace Intrinsic {
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32 enum ID : unsigned;
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33 }
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34
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35 class GlobalValue : public Constant {
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83
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36 GlobalValue(const GlobalValue &) = delete;
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37 public:
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38 /// @brief An enumeration for the kinds of linkage for global values.
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39 enum LinkageTypes {
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40 ExternalLinkage = 0,///< Externally visible function
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41 AvailableExternallyLinkage, ///< Available for inspection, not emission.
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42 LinkOnceAnyLinkage, ///< Keep one copy of function when linking (inline)
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43 LinkOnceODRLinkage, ///< Same, but only replaced by something equivalent.
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44 WeakAnyLinkage, ///< Keep one copy of named function when linking (weak)
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45 WeakODRLinkage, ///< Same, but only replaced by something equivalent.
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46 AppendingLinkage, ///< Special purpose, only applies to global arrays
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47 InternalLinkage, ///< Rename collisions when linking (static functions).
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48 PrivateLinkage, ///< Like Internal, but omit from symbol table.
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49 ExternalWeakLinkage,///< ExternalWeak linkage description.
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50 CommonLinkage ///< Tentative definitions.
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51 };
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52
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53 /// @brief An enumeration for the kinds of visibility of global values.
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54 enum VisibilityTypes {
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55 DefaultVisibility = 0, ///< The GV is visible
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56 HiddenVisibility, ///< The GV is hidden
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57 ProtectedVisibility ///< The GV is protected
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58 };
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59
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77
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60 /// @brief Storage classes of global values for PE targets.
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61 enum DLLStorageClassTypes {
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62 DefaultStorageClass = 0,
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63 DLLImportStorageClass = 1, ///< Function to be imported from DLL
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64 DLLExportStorageClass = 2 ///< Function to be accessible from DLL.
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65 };
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66
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67 protected:
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77
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68 GlobalValue(Type *Ty, ValueTy VTy, Use *Ops, unsigned NumOps,
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95
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69 LinkageTypes Linkage, const Twine &Name, unsigned AddressSpace)
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70 : Constant(PointerType::get(Ty, AddressSpace), VTy, Ops, NumOps),
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71 ValueType(Ty), Linkage(Linkage), Visibility(DefaultVisibility),
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72 UnnamedAddr(0), DllStorageClass(DefaultStorageClass),
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73 ThreadLocal(NotThreadLocal), IntID((Intrinsic::ID)0U), Parent(nullptr) {
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74 setName(Name);
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75 }
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76
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77 Type *ValueType;
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78 // Note: VC++ treats enums as signed, so an extra bit is required to prevent
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79 // Linkage and Visibility from turning into negative values.
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80 LinkageTypes Linkage : 5; // The linkage of this global
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81 unsigned Visibility : 2; // The visibility style of this global
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82 unsigned UnnamedAddr : 1; // This value's address is not significant
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77
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83 unsigned DllStorageClass : 2; // DLL storage class
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84
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85 unsigned ThreadLocal : 3; // Is this symbol "Thread Local", if so, what is
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86 // the desired model?
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95
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87 static const unsigned GlobalValueSubClassDataBits = 19;
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77
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88
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89 private:
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90 // Give subclasses access to what otherwise would be wasted padding.
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91 // (19 + 3 + 2 + 1 + 2 + 5) == 32.
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95
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92 unsigned SubClassData : GlobalValueSubClassDataBits;
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93
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94 friend class Constant;
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95 void destroyConstantImpl();
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96 Value *handleOperandChangeImpl(Value *From, Value *To, Use *U);
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97
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98 protected:
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95
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99 /// \brief The intrinsic ID for this subclass (which must be a Function).
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100 ///
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101 /// This member is defined by this class, but not used for anything.
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102 /// Subclasses can use it to store their intrinsic ID, if they have one.
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103 ///
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104 /// This is stored here to save space in Function on 64-bit hosts.
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105 Intrinsic::ID IntID;
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106
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77
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107 unsigned getGlobalValueSubClassData() const {
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108 return SubClassData;
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109 }
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110 void setGlobalValueSubClassData(unsigned V) {
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95
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111 assert(V < (1 << GlobalValueSubClassDataBits) && "It will not fit");
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77
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112 SubClassData = V;
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113 }
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114
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115 Module *Parent; // The containing module.
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116 public:
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77
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117 enum ThreadLocalMode {
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118 NotThreadLocal = 0,
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119 GeneralDynamicTLSModel,
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120 LocalDynamicTLSModel,
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121 InitialExecTLSModel,
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122 LocalExecTLSModel
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123 };
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124
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95
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125 ~GlobalValue() override {
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126 removeDeadConstantUsers(); // remove any dead constants using this.
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127 }
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128
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129 unsigned getAlignment() const;
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130
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131 bool hasUnnamedAddr() const { return UnnamedAddr; }
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132 void setUnnamedAddr(bool Val) { UnnamedAddr = Val; }
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133
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77
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134 bool hasComdat() const { return getComdat() != nullptr; }
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135 Comdat *getComdat();
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136 const Comdat *getComdat() const {
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137 return const_cast<GlobalValue *>(this)->getComdat();
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138 }
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139
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140 VisibilityTypes getVisibility() const { return VisibilityTypes(Visibility); }
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141 bool hasDefaultVisibility() const { return Visibility == DefaultVisibility; }
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142 bool hasHiddenVisibility() const { return Visibility == HiddenVisibility; }
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143 bool hasProtectedVisibility() const {
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144 return Visibility == ProtectedVisibility;
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145 }
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77
|
146 void setVisibility(VisibilityTypes V) {
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147 assert((!hasLocalLinkage() || V == DefaultVisibility) &&
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148 "local linkage requires default visibility");
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149 Visibility = V;
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150 }
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151
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152 /// If the value is "Thread Local", its value isn't shared by the threads.
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153 bool isThreadLocal() const { return getThreadLocalMode() != NotThreadLocal; }
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154 void setThreadLocal(bool Val) {
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155 setThreadLocalMode(Val ? GeneralDynamicTLSModel : NotThreadLocal);
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156 }
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157 void setThreadLocalMode(ThreadLocalMode Val) {
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158 assert(Val == NotThreadLocal || getValueID() != Value::FunctionVal);
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159 ThreadLocal = Val;
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160 }
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161 ThreadLocalMode getThreadLocalMode() const {
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162 return static_cast<ThreadLocalMode>(ThreadLocal);
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163 }
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164
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77
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165 DLLStorageClassTypes getDLLStorageClass() const {
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166 return DLLStorageClassTypes(DllStorageClass);
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167 }
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168 bool hasDLLImportStorageClass() const {
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169 return DllStorageClass == DLLImportStorageClass;
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170 }
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171 bool hasDLLExportStorageClass() const {
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172 return DllStorageClass == DLLExportStorageClass;
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173 }
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174 void setDLLStorageClass(DLLStorageClassTypes C) { DllStorageClass = C; }
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175
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176 bool hasSection() const { return !StringRef(getSection()).empty(); }
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177 // It is unfortunate that we have to use "char *" in here since this is
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178 // always non NULL, but:
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179 // * The C API expects a null terminated string, so we cannot use StringRef.
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180 // * The C API expects us to own it, so we cannot use a std:string.
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181 // * For GlobalAliases we can fail to find the section and we have to
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182 // return "", so we cannot use a "const std::string &".
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183 const char *getSection() const;
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184
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185 /// Global values are always pointers.
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95
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186 PointerType *getType() const { return cast<PointerType>(User::getType()); }
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187
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188 Type *getValueType() const { return ValueType; }
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189
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190 static LinkageTypes getLinkOnceLinkage(bool ODR) {
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191 return ODR ? LinkOnceODRLinkage : LinkOnceAnyLinkage;
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192 }
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193 static LinkageTypes getWeakLinkage(bool ODR) {
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194 return ODR ? WeakODRLinkage : WeakAnyLinkage;
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195 }
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196
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197 static bool isExternalLinkage(LinkageTypes Linkage) {
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198 return Linkage == ExternalLinkage;
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199 }
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200 static bool isAvailableExternallyLinkage(LinkageTypes Linkage) {
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201 return Linkage == AvailableExternallyLinkage;
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202 }
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77
|
203 static bool isLinkOnceODRLinkage(LinkageTypes Linkage) {
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204 return Linkage == LinkOnceODRLinkage;
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205 }
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206 static bool isLinkOnceLinkage(LinkageTypes Linkage) {
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207 return Linkage == LinkOnceAnyLinkage || Linkage == LinkOnceODRLinkage;
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208 }
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77
|
209 static bool isWeakAnyLinkage(LinkageTypes Linkage) {
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210 return Linkage == WeakAnyLinkage;
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211 }
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212 static bool isWeakODRLinkage(LinkageTypes Linkage) {
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213 return Linkage == WeakODRLinkage;
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214 }
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215 static bool isWeakLinkage(LinkageTypes Linkage) {
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|
77
|
216 return isWeakAnyLinkage(Linkage) || isWeakODRLinkage(Linkage);
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217 }
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218 static bool isAppendingLinkage(LinkageTypes Linkage) {
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219 return Linkage == AppendingLinkage;
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220 }
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221 static bool isInternalLinkage(LinkageTypes Linkage) {
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222 return Linkage == InternalLinkage;
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223 }
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224 static bool isPrivateLinkage(LinkageTypes Linkage) {
|
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225 return Linkage == PrivateLinkage;
|
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226 }
|
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227 static bool isLocalLinkage(LinkageTypes Linkage) {
|
|
77
|
228 return isInternalLinkage(Linkage) || isPrivateLinkage(Linkage);
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229 }
|
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230 static bool isExternalWeakLinkage(LinkageTypes Linkage) {
|
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231 return Linkage == ExternalWeakLinkage;
|
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232 }
|
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233 static bool isCommonLinkage(LinkageTypes Linkage) {
|
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234 return Linkage == CommonLinkage;
|
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235 }
|
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236
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|
77
|
237 /// Whether the definition of this global may be discarded if it is not used
|
|
|
238 /// in its compilation unit.
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239 static bool isDiscardableIfUnused(LinkageTypes Linkage) {
|
|
95
|
240 return isLinkOnceLinkage(Linkage) || isLocalLinkage(Linkage) ||
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|
|
241 isAvailableExternallyLinkage(Linkage);
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242 }
|
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243
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|
77
|
244 /// Whether the definition of this global may be replaced by something
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245 /// non-equivalent at link time. For example, if a function has weak linkage
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246 /// then the code defining it may be replaced by different code.
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247 static bool mayBeOverridden(LinkageTypes Linkage) {
|
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77
|
248 return Linkage == WeakAnyLinkage || Linkage == LinkOnceAnyLinkage ||
|
|
|
249 Linkage == CommonLinkage || Linkage == ExternalWeakLinkage;
|
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250 }
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251
|
|
77
|
252 /// Whether the definition of this global may be replaced at link time. NB:
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|
|
253 /// Using this method outside of the code generators is almost always a
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254 /// mistake: when working at the IR level use mayBeOverridden instead as it
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255 /// knows about ODR semantics.
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256 static bool isWeakForLinker(LinkageTypes Linkage) {
|
|
95
|
257 return Linkage == WeakAnyLinkage || Linkage == WeakODRLinkage ||
|
|
|
258 Linkage == LinkOnceAnyLinkage || Linkage == LinkOnceODRLinkage ||
|
|
|
259 Linkage == CommonLinkage || Linkage == ExternalWeakLinkage;
|
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260 }
|
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261
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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262 bool hasExternalLinkage() const { return isExternalLinkage(Linkage); }
|
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263 bool hasAvailableExternallyLinkage() const {
|
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264 return isAvailableExternallyLinkage(Linkage);
|
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|
265 }
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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266 bool hasLinkOnceLinkage() const {
|
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267 return isLinkOnceLinkage(Linkage);
|
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268 }
|
|
77
|
269 bool hasLinkOnceODRLinkage() const { return isLinkOnceODRLinkage(Linkage); }
|
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|
270 bool hasWeakLinkage() const {
|
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271 return isWeakLinkage(Linkage);
|
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|
272 }
|
|
77
|
273 bool hasWeakAnyLinkage() const {
|
|
|
274 return isWeakAnyLinkage(Linkage);
|
|
|
275 }
|
|
|
276 bool hasWeakODRLinkage() const {
|
|
|
277 return isWeakODRLinkage(Linkage);
|
|
|
278 }
|
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|
279 bool hasAppendingLinkage() const { return isAppendingLinkage(Linkage); }
|
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|
280 bool hasInternalLinkage() const { return isInternalLinkage(Linkage); }
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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|
281 bool hasPrivateLinkage() const { return isPrivateLinkage(Linkage); }
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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|
282 bool hasLocalLinkage() const { return isLocalLinkage(Linkage); }
|
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|
283 bool hasExternalWeakLinkage() const { return isExternalWeakLinkage(Linkage); }
|
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diff
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|
284 bool hasCommonLinkage() const { return isCommonLinkage(Linkage); }
|
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|
285
|
|
77
|
286 void setLinkage(LinkageTypes LT) {
|
|
|
287 if (isLocalLinkage(LT))
|
|
|
288 Visibility = DefaultVisibility;
|
|
|
289 Linkage = LT;
|
|
|
290 }
|
0
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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diff
changeset
|
291 LinkageTypes getLinkage() const { return Linkage; }
|
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parents:
diff
changeset
|
292
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
293 bool isDiscardableIfUnused() const {
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
294 return isDiscardableIfUnused(Linkage);
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
295 }
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
296
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
297 bool mayBeOverridden() const { return mayBeOverridden(Linkage); }
|
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parents:
diff
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|
298
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
299 bool isWeakForLinker() const { return isWeakForLinker(Linkage); }
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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diff
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|
300
|
|
77
|
301 /// Copy all additional attributes (those not needed to create a GlobalValue)
|
|
|
302 /// from the GlobalValue Src to this one.
|
0
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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diff
changeset
|
303 virtual void copyAttributesFrom(const GlobalValue *Src);
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
304
|
|
77
|
305 /// If special LLVM prefix that is used to inform the asm printer to not emit
|
|
|
306 /// usual symbol prefix before the symbol name is used then return linkage
|
|
|
307 /// name after skipping this special LLVM prefix.
|
0
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
308 static StringRef getRealLinkageName(StringRef Name) {
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
309 if (!Name.empty() && Name[0] == '\1')
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
310 return Name.substr(1);
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
311 return Name;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
312 }
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
313
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
314 /// @name Materialization
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
315 /// Materialization is used to construct functions only as they're needed. This
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
316 /// is useful to reduce memory usage in LLVM or parsing work done by the
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
317 /// BitcodeReader to load the Module.
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
318 /// @{
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
319
|
|
77
|
320 /// If this function's Module is being lazily streamed in functions from disk
|
|
|
321 /// or some other source, this method can be used to check to see if the
|
|
|
322 /// function has been read in yet or not.
|
0
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
323 bool isMaterializable() const;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
324
|
|
77
|
325 /// Returns true if this function was loaded from a GVMaterializer that's
|
|
|
326 /// still attached to its Module and that knows how to dematerialize the
|
|
|
327 /// function.
|
0
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
328 bool isDematerializable() const;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
329
|
|
77
|
330 /// Make sure this GlobalValue is fully read. If the module is corrupt, this
|
|
|
331 /// returns true and fills in the optional string with information about the
|
|
|
332 /// problem. If successful, this returns false.
|
|
83
|
333 std::error_code materialize();
|
0
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
334
|
|
77
|
335 /// If this GlobalValue is read in, and if the GVMaterializer supports it,
|
|
|
336 /// release the memory for the function, and set it up to be materialized
|
|
|
337 /// lazily. If !isDematerializable(), this method is a noop.
|
|
95
|
338 void dematerialize();
|
0
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
339
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
340 /// @}
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
341
|
|
77
|
342 /// Return true if the primary definition of this global value is outside of
|
|
|
343 /// the current translation unit.
|
0
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
344 bool isDeclaration() const;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
345
|
|
83
|
346 bool isDeclarationForLinker() const {
|
|
|
347 if (hasAvailableExternallyLinkage())
|
|
|
348 return true;
|
|
|
349
|
|
|
350 return isDeclaration();
|
|
|
351 }
|
|
|
352
|
|
95
|
353 /// Returns true if this global's definition will be the one chosen by the
|
|
|
354 /// linker.
|
|
|
355 bool isStrongDefinitionForLinker() const {
|
|
|
356 return !(isDeclarationForLinker() || isWeakForLinker());
|
|
|
357 }
|
|
|
358
|
|
77
|
359 /// This method unlinks 'this' from the containing module, but does not delete
|
|
|
360 /// it.
|
0
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
361 virtual void removeFromParent() = 0;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
362
|
|
77
|
363 /// This method unlinks 'this' from the containing module and deletes it.
|
0
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
364 virtual void eraseFromParent() = 0;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
365
|
|
77
|
366 /// Get the module that this global value is contained inside of...
|
|
95
|
367 Module *getParent() { return Parent; }
|
|
|
368 const Module *getParent() const { return Parent; }
|
|
77
|
369
|
0
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
370 // Methods for support type inquiry through isa, cast, and dyn_cast:
|
|
95
|
371 static bool classof(const Value *V) {
|
0
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
372 return V->getValueID() == Value::FunctionVal ||
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
373 V->getValueID() == Value::GlobalVariableVal ||
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
374 V->getValueID() == Value::GlobalAliasVal;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
375 }
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
376 };
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
377
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
378 } // End llvm namespace
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
379
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
380 #endif
|
