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1 //===-- IndirectionUtils.h - Utilities for adding indirections --*- 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 // Contains utilities for adding indirections and breaking up modules.
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11 //
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12 //===----------------------------------------------------------------------===//
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13
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14 #ifndef LLVM_EXECUTIONENGINE_ORC_INDIRECTIONUTILS_H
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15 #define LLVM_EXECUTIONENGINE_ORC_INDIRECTIONUTILS_H
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16
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120
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17 #include "llvm/ADT/StringMap.h"
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18 #include "llvm/ADT/StringRef.h"
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19 #include "llvm/ADT/Twine.h"
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20 #include "llvm/ExecutionEngine/JITSymbol.h"
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83
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21 #include "llvm/IR/IRBuilder.h"
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22 #include "llvm/IR/Mangler.h"
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23 #include "llvm/IR/Module.h"
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120
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24 #include "llvm/Support/Error.h"
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25 #include "llvm/Support/Memory.h"
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100
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26 #include "llvm/Support/Process.h"
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120
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27 #include "llvm/Transforms/Utils/ValueMapper.h"
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28 #include <algorithm>
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29 #include <cassert>
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30 #include <cstdint>
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31 #include <functional>
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32 #include <map>
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33 #include <memory>
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34 #include <system_error>
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35 #include <utility>
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36 #include <vector>
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83
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37
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38 namespace llvm {
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95
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39 namespace orc {
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40
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100
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41 /// @brief Target-independent base class for compile callback management.
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42 class JITCompileCallbackManager {
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83
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43 public:
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120
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44 typedef std::function<JITTargetAddress()> CompileFtor;
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45
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46 /// @brief Handle to a newly created compile callback. Can be used to get an
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47 /// IR constant representing the address of the trampoline, and to set
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48 /// the compile action for the callback.
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49 class CompileCallbackInfo {
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50 public:
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120
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51 CompileCallbackInfo(JITTargetAddress Addr, CompileFtor &Compile)
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52 : Addr(Addr), Compile(Compile) {}
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53
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120
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54 JITTargetAddress getAddress() const { return Addr; }
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95
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55 void setCompileAction(CompileFtor Compile) {
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56 this->Compile = std::move(Compile);
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57 }
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120
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58
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95
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59 private:
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120
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60 JITTargetAddress Addr;
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95
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61 CompileFtor &Compile;
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62 };
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63
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100
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64 /// @brief Construct a JITCompileCallbackManager.
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83
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65 /// @param ErrorHandlerAddress The address of an error handler in the target
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66 /// process to be used if a compile callback fails.
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120
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67 JITCompileCallbackManager(JITTargetAddress ErrorHandlerAddress)
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68 : ErrorHandlerAddress(ErrorHandlerAddress) {}
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69
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120
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70 virtual ~JITCompileCallbackManager() = default;
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71
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83
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72 /// @brief Execute the callback for the given trampoline id. Called by the JIT
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73 /// to compile functions on demand.
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120
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74 JITTargetAddress executeCompileCallback(JITTargetAddress TrampolineAddr) {
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95
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75 auto I = ActiveTrampolines.find(TrampolineAddr);
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83
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76 // FIXME: Also raise an error in the Orc error-handler when we finally have
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77 // one.
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78 if (I == ActiveTrampolines.end())
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79 return ErrorHandlerAddress;
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80
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81 // Found a callback handler. Yank this trampoline out of the active list and
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82 // put it back in the available trampolines list, then try to run the
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83 // handler's compile and update actions.
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120
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84 // Moving the trampoline ID back to the available list first means there's
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85 // at
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86 // least one available trampoline if the compile action triggers a request
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87 // for
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83
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88 // a new one.
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95
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89 auto Compile = std::move(I->second);
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83
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90 ActiveTrampolines.erase(I);
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95
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91 AvailableTrampolines.push_back(TrampolineAddr);
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92
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93 if (auto Addr = Compile())
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94 return Addr;
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95
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96 return ErrorHandlerAddress;
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97 }
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98
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99 /// @brief Reserve a compile callback.
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100
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100 CompileCallbackInfo getCompileCallback() {
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120
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101 JITTargetAddress TrampolineAddr = getAvailableTrampolineAddr();
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100
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102 auto &Compile = this->ActiveTrampolines[TrampolineAddr];
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103 return CompileCallbackInfo(TrampolineAddr, Compile);
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104 }
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105
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95
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106 /// @brief Get a CompileCallbackInfo for an existing callback.
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120
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107 CompileCallbackInfo getCompileCallbackInfo(JITTargetAddress TrampolineAddr) {
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108 auto I = ActiveTrampolines.find(TrampolineAddr);
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109 assert(I != ActiveTrampolines.end() && "Not an active trampoline.");
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110 return CompileCallbackInfo(I->first, I->second);
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111 }
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112
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113 /// @brief Release a compile callback.
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114 ///
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115 /// Note: Callbacks are auto-released after they execute. This method should
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116 /// only be called to manually release a callback that is not going to
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117 /// execute.
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120
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118 void releaseCompileCallback(JITTargetAddress TrampolineAddr) {
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119 auto I = ActiveTrampolines.find(TrampolineAddr);
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120 assert(I != ActiveTrampolines.end() && "Not an active trampoline.");
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121 ActiveTrampolines.erase(I);
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122 AvailableTrampolines.push_back(TrampolineAddr);
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83
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123 }
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124
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125 protected:
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120
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126 JITTargetAddress ErrorHandlerAddress;
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127
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120
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128 typedef std::map<JITTargetAddress, CompileFtor> TrampolineMapT;
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129 TrampolineMapT ActiveTrampolines;
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120
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130 std::vector<JITTargetAddress> AvailableTrampolines;
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131
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132 private:
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120
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133 JITTargetAddress getAvailableTrampolineAddr() {
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134 if (this->AvailableTrampolines.empty())
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135 grow();
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136 assert(!this->AvailableTrampolines.empty() &&
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137 "Failed to grow available trampolines.");
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120
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138 JITTargetAddress TrampolineAddr = this->AvailableTrampolines.back();
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139 this->AvailableTrampolines.pop_back();
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140 return TrampolineAddr;
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141 }
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142
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100
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143 // Create new trampolines - to be implemented in subclasses.
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144 virtual void grow() = 0;
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145
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146 virtual void anchor();
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147 };
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148
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149 /// @brief Manage compile callbacks for in-process JITs.
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150 template <typename TargetT>
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151 class LocalJITCompileCallbackManager : public JITCompileCallbackManager {
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152 public:
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153 /// @brief Construct a InProcessJITCompileCallbackManager.
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154 /// @param ErrorHandlerAddress The address of an error handler in the target
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155 /// process to be used if a compile callback fails.
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120
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156 LocalJITCompileCallbackManager(JITTargetAddress ErrorHandlerAddress)
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157 : JITCompileCallbackManager(ErrorHandlerAddress) {
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100
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158
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159 /// Set up the resolver block.
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160 std::error_code EC;
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120
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161 ResolverBlock = sys::OwningMemoryBlock(sys::Memory::allocateMappedMemory(
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162 TargetT::ResolverCodeSize, nullptr,
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163 sys::Memory::MF_READ | sys::Memory::MF_WRITE, EC));
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100
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164 assert(!EC && "Failed to allocate resolver block");
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165
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166 TargetT::writeResolverCode(static_cast<uint8_t *>(ResolverBlock.base()),
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167 &reenter, this);
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168
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169 EC = sys::Memory::protectMappedMemory(ResolverBlock.getMemoryBlock(),
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170 sys::Memory::MF_READ |
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171 sys::Memory::MF_EXEC);
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172 assert(!EC && "Failed to mprotect resolver block");
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173 }
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174
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175 private:
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120
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176 static JITTargetAddress reenter(void *CCMgr, void *TrampolineId) {
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177 JITCompileCallbackManager *Mgr =
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120
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178 static_cast<JITCompileCallbackManager *>(CCMgr);
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179 return Mgr->executeCompileCallback(
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120
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180 static_cast<JITTargetAddress>(
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181 reinterpret_cast<uintptr_t>(TrampolineId)));
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100
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182 }
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183
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184 void grow() override {
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83
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185 assert(this->AvailableTrampolines.empty() && "Growing prematurely?");
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186
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187 std::error_code EC;
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188 auto TrampolineBlock =
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120
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189 sys::OwningMemoryBlock(sys::Memory::allocateMappedMemory(
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190 sys::Process::getPageSize(), nullptr,
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191 sys::Memory::MF_READ | sys::Memory::MF_WRITE, EC));
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100
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192 assert(!EC && "Failed to allocate trampoline block");
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193
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194 unsigned NumTrampolines =
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120
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195 (sys::Process::getPageSize() - TargetT::PointerSize) /
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196 TargetT::TrampolineSize;
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197
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120
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198 uint8_t *TrampolineMem = static_cast<uint8_t *>(TrampolineBlock.base());
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100
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199 TargetT::writeTrampolines(TrampolineMem, ResolverBlock.base(),
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200 NumTrampolines);
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201
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202 for (unsigned I = 0; I < NumTrampolines; ++I)
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203 this->AvailableTrampolines.push_back(
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120
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204 static_cast<JITTargetAddress>(reinterpret_cast<uintptr_t>(
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205 TrampolineMem + (I * TargetT::TrampolineSize))));
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206
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207 EC = sys::Memory::protectMappedMemory(TrampolineBlock.getMemoryBlock(),
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208 sys::Memory::MF_READ |
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209 sys::Memory::MF_EXEC);
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210 assert(!EC && "Failed to mprotect trampoline block");
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211
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212 TrampolineBlocks.push_back(std::move(TrampolineBlock));
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83
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213 }
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214
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215 sys::OwningMemoryBlock ResolverBlock;
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216 std::vector<sys::OwningMemoryBlock> TrampolineBlocks;
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217 };
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218
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219 /// @brief Base class for managing collections of named indirect stubs.
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220 class IndirectStubsManager {
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221 public:
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120
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222 /// @brief Map type for initializing the manager. See init.
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223 typedef StringMap<std::pair<JITTargetAddress, JITSymbolFlags>> StubInitsMap;
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100
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224
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120
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225 virtual ~IndirectStubsManager() = default;
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226
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227 /// @brief Create a single stub with the given name, target address and flags.
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120
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228 virtual Error createStub(StringRef StubName, JITTargetAddress StubAddr,
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229 JITSymbolFlags StubFlags) = 0;
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230
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231 /// @brief Create StubInits.size() stubs with the given names, target
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232 /// addresses, and flags.
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120
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233 virtual Error createStubs(const StubInitsMap &StubInits) = 0;
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234
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235 /// @brief Find the stub with the given name. If ExportedStubsOnly is true,
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236 /// this will only return a result if the stub's flags indicate that it
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237 /// is exported.
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238 virtual JITSymbol findStub(StringRef Name, bool ExportedStubsOnly) = 0;
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239
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240 /// @brief Find the implementation-pointer for the stub.
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241 virtual JITSymbol findPointer(StringRef Name) = 0;
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242
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243 /// @brief Change the value of the implementation pointer for the stub.
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120
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244 virtual Error updatePointer(StringRef Name, JITTargetAddress NewAddr) = 0;
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245
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246 private:
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247 virtual void anchor();
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248 };
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249
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250 /// @brief IndirectStubsManager implementation for the host architecture, e.g.
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251 /// OrcX86_64. (See OrcArchitectureSupport.h).
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252 template <typename TargetT>
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253 class LocalIndirectStubsManager : public IndirectStubsManager {
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254 public:
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120
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255 Error createStub(StringRef StubName, JITTargetAddress StubAddr,
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256 JITSymbolFlags StubFlags) override {
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257 if (auto Err = reserveStubs(1))
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258 return Err;
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259
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260 createStubInternal(StubName, StubAddr, StubFlags);
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261
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262 return Error::success();
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263 }
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264
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120
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265 Error createStubs(const StubInitsMap &StubInits) override {
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266 if (auto Err = reserveStubs(StubInits.size()))
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267 return Err;
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100
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268
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269 for (auto &Entry : StubInits)
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270 createStubInternal(Entry.first(), Entry.second.first,
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271 Entry.second.second);
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272
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273 return Error::success();
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100
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274 }
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275
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276 JITSymbol findStub(StringRef Name, bool ExportedStubsOnly) override {
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277 auto I = StubIndexes.find(Name);
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278 if (I == StubIndexes.end())
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279 return nullptr;
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280 auto Key = I->second.first;
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281 void *StubAddr = IndirectStubsInfos[Key.first].getStub(Key.second);
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282 assert(StubAddr && "Missing stub address");
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283 auto StubTargetAddr =
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120
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284 static_cast<JITTargetAddress>(reinterpret_cast<uintptr_t>(StubAddr));
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285 auto StubSymbol = JITSymbol(StubTargetAddr, I->second.second);
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120
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286 if (ExportedStubsOnly && !StubSymbol.getFlags().isExported())
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287 return nullptr;
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288 return StubSymbol;
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289 }
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290
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291 JITSymbol findPointer(StringRef Name) override {
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292 auto I = StubIndexes.find(Name);
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293 if (I == StubIndexes.end())
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294 return nullptr;
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295 auto Key = I->second.first;
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296 void *PtrAddr = IndirectStubsInfos[Key.first].getPtr(Key.second);
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297 assert(PtrAddr && "Missing pointer address");
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298 auto PtrTargetAddr =
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120
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299 static_cast<JITTargetAddress>(reinterpret_cast<uintptr_t>(PtrAddr));
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300 return JITSymbol(PtrTargetAddr, I->second.second);
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301 }
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302
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120
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303 Error updatePointer(StringRef Name, JITTargetAddress NewAddr) override {
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304 auto I = StubIndexes.find(Name);
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305 assert(I != StubIndexes.end() && "No stub pointer for symbol");
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306 auto Key = I->second.first;
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307 *IndirectStubsInfos[Key.first].getPtr(Key.second) =
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120
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308 reinterpret_cast<void *>(static_cast<uintptr_t>(NewAddr));
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309 return Error::success();
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100
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310 }
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311
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312 private:
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120
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313 Error reserveStubs(unsigned NumStubs) {
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314 if (NumStubs <= FreeStubs.size())
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315 return Error::success();
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316
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317 unsigned NewStubsRequired = NumStubs - FreeStubs.size();
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318 unsigned NewBlockId = IndirectStubsInfos.size();
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319 typename TargetT::IndirectStubsInfo ISI;
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120
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320 if (auto Err =
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321 TargetT::emitIndirectStubsBlock(ISI, NewStubsRequired, nullptr))
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322 return Err;
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323 for (unsigned I = 0; I < ISI.getNumStubs(); ++I)
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324 FreeStubs.push_back(std::make_pair(NewBlockId, I));
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325 IndirectStubsInfos.push_back(std::move(ISI));
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326 return Error::success();
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100
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327 }
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328
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120
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329 void createStubInternal(StringRef StubName, JITTargetAddress InitAddr,
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330 JITSymbolFlags StubFlags) {
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331 auto Key = FreeStubs.back();
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332 FreeStubs.pop_back();
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333 *IndirectStubsInfos[Key.first].getPtr(Key.second) =
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120
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334 reinterpret_cast<void *>(static_cast<uintptr_t>(InitAddr));
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335 StubIndexes[StubName] = std::make_pair(Key, StubFlags);
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336 }
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337
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338 std::vector<typename TargetT::IndirectStubsInfo> IndirectStubsInfos;
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339 typedef std::pair<uint16_t, uint16_t> StubKey;
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340 std::vector<StubKey> FreeStubs;
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341 StringMap<std::pair<StubKey, JITSymbolFlags>> StubIndexes;
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83
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342 };
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343
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120
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344 /// @brief Create a local compile callback manager.
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345 ///
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346 /// The given target triple will determine the ABI, and the given
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347 /// ErrorHandlerAddress will be used by the resulting compile callback
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348 /// manager if a compile callback fails.
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349 std::unique_ptr<JITCompileCallbackManager>
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350 createLocalCompileCallbackManager(const Triple &T,
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351 JITTargetAddress ErrorHandlerAddress);
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352
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353 /// @brief Create a local indriect stubs manager builder.
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354 ///
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355 /// The given target triple will determine the ABI.
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356 std::function<std::unique_ptr<IndirectStubsManager>()>
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357 createLocalIndirectStubsManagerBuilder(const Triple &T);
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358
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95
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359 /// @brief Build a function pointer of FunctionType with the given constant
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360 /// address.
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361 ///
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362 /// Usage example: Turn a trampoline address into a function pointer constant
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363 /// for use in a stub.
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120
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364 Constant *createIRTypedAddress(FunctionType &FT, JITTargetAddress Addr);
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83
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365
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95
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366 /// @brief Create a function pointer with the given type, name, and initializer
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367 /// in the given Module.
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120
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368 GlobalVariable *createImplPointer(PointerType &PT, Module &M, const Twine &Name,
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369 Constant *Initializer);
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95
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370
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371 /// @brief Turn a function declaration into a stub function that makes an
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372 /// indirect call using the given function pointer.
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100
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373 void makeStub(Function &F, Value &ImplPointer);
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83
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374
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95
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375 /// @brief Raise linkage types and rename as necessary to ensure that all
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376 /// symbols are accessible for other modules.
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377 ///
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378 /// This should be called before partitioning a module to ensure that the
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379 /// partitions retain access to each other's symbols.
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380 void makeAllSymbolsExternallyAccessible(Module &M);
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83
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381
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95
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382 /// @brief Clone a function declaration into a new module.
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383 ///
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384 /// This function can be used as the first step towards creating a callback
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385 /// stub (see makeStub), or moving a function body (see moveFunctionBody).
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386 ///
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387 /// If the VMap argument is non-null, a mapping will be added between F and
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388 /// the new declaration, and between each of F's arguments and the new
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389 /// declaration's arguments. This map can then be passed in to moveFunction to
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390 /// move the function body if required. Note: When moving functions between
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391 /// modules with these utilities, all decls should be cloned (and added to a
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392 /// single VMap) before any bodies are moved. This will ensure that references
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393 /// between functions all refer to the versions in the new module.
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120
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394 Function *cloneFunctionDecl(Module &Dst, const Function &F,
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95
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395 ValueToValueMapTy *VMap = nullptr);
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83
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396
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95
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397 /// @brief Move the body of function 'F' to a cloned function declaration in a
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398 /// different module (See related cloneFunctionDecl).
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399 ///
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400 /// If the target function declaration is not supplied via the NewF parameter
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401 /// then it will be looked up via the VMap.
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402 ///
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403 /// This will delete the body of function 'F' from its original parent module,
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404 /// but leave its declaration.
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405 void moveFunctionBody(Function &OrigF, ValueToValueMapTy &VMap,
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406 ValueMaterializer *Materializer = nullptr,
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407 Function *NewF = nullptr);
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408
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409 /// @brief Clone a global variable declaration into a new module.
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120
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410 GlobalVariable *cloneGlobalVariableDecl(Module &Dst, const GlobalVariable &GV,
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95
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411 ValueToValueMapTy *VMap = nullptr);
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83
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412
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95
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413 /// @brief Move global variable GV from its parent module to cloned global
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414 /// declaration in a different module.
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415 ///
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416 /// If the target global declaration is not supplied via the NewGV parameter
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417 /// then it will be looked up via the VMap.
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418 ///
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419 /// This will delete the initializer of GV from its original parent module,
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420 /// but leave its declaration.
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421 void moveGlobalVariableInitializer(GlobalVariable &OrigGV,
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422 ValueToValueMapTy &VMap,
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423 ValueMaterializer *Materializer = nullptr,
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424 GlobalVariable *NewGV = nullptr);
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83
|
425
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120
|
426 /// @brief Clone a global alias declaration into a new module.
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427 GlobalAlias *cloneGlobalAliasDecl(Module &Dst, const GlobalAlias &OrigA,
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100
|
428 ValueToValueMapTy &VMap);
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83
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429
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120
|
430 /// @brief Clone module flags metadata into the destination module.
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431 void cloneModuleFlagsMetadata(Module &Dst, const Module &Src,
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432 ValueToValueMapTy &VMap);
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433
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434 } // end namespace orc
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435 } // end namespace llvm
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83
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436
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437 #endif // LLVM_EXECUTIONENGINE_ORC_INDIRECTIONUTILS_H
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