llvm/examples/Kaleidoscope/BuildingAJIT/Chapter1/KaleidoscopeJIT.h

   1 //===- KaleidoscopeJIT.h - A simple JIT for Kaleidoscope --------*- C++ -*-===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 //
   9 // Contains a simple JIT definition for use in the kaleidoscope tutorials.
  10 //
  11 //===----------------------------------------------------------------------===//
  12
  13 #ifndef LLVM_EXECUTIONENGINE_ORC_KALEIDOSCOPEJIT_H
  14 #define LLVM_EXECUTIONENGINE_ORC_KALEIDOSCOPEJIT_H
  15
  16 #include "llvm/ADT/StringRef.h"
  17 #include "llvm/ExecutionEngine/JITSymbol.h"
  18 #include "llvm/ExecutionEngine/Orc/CompileUtils.h"
  19 #include "llvm/ExecutionEngine/Orc/Core.h"
  20 #include "llvm/ExecutionEngine/Orc/ExecutionUtils.h"
  21 #include "llvm/ExecutionEngine/Orc/ExecutorProcessControl.h"
  22 #include "llvm/ExecutionEngine/Orc/IRCompileLayer.h"
  23 #include "llvm/ExecutionEngine/Orc/JITTargetMachineBuilder.h"
  24 #include "llvm/ExecutionEngine/Orc/RTDyldObjectLinkingLayer.h"
  25 #include "llvm/ExecutionEngine/SectionMemoryManager.h"
  26 #include "llvm/IR/DataLayout.h"
  27 #include "llvm/IR/LLVMContext.h"
  28 #include <memory>
  29
  30 namespace llvm {
  31 namespace orc {
  32
  33 class KaleidoscopeJIT {
  34 private:
  35   std::unique_ptr<ExecutionSession> ES;
  36
  37   DataLayout DL;
  38   MangleAndInterner Mangle;
  39
  40   RTDyldObjectLinkingLayer ObjectLayer;
  41   IRCompileLayer CompileLayer;
  42
  43   JITDylib &MainJD;
  44
  45 public:
  46   KaleidoscopeJIT(std::unique_ptr<ExecutionSession> ES,
  47                   JITTargetMachineBuilder JTMB, DataLayout DL)
  48       : ES(std::move(ES)), DL(std::move(DL)), Mangle(*this->ES, this->DL),
  49         ObjectLayer(*this->ES,
  50                     []() { return std::make_unique<SectionMemoryManager>(); }),
  51         CompileLayer(*this->ES, ObjectLayer,
  52                      std::make_unique<ConcurrentIRCompiler>(std::move(JTMB))),
  53         MainJD(this->ES->createBareJITDylib("<main>")) {
  54     MainJD.addGenerator(
  55         cantFail(DynamicLibrarySearchGenerator::GetForCurrentProcess(
  56             DL.getGlobalPrefix())));
  57   }
  58
  59   ~KaleidoscopeJIT() {
  60     if (auto Err = ES->endSession())
  61       ES->reportError(std::move(Err));
  62   }
  63
  64   static Expected<std::unique_ptr<KaleidoscopeJIT>> Create() {
  65     auto EPC = SelfExecutorProcessControl::Create();
  66     if (!EPC)
  67       return EPC.takeError();
  68
  69     auto ES = std::make_unique<ExecutionSession>(std::move(*EPC));
  70
  71     JITTargetMachineBuilder JTMB(
  72         ES->getExecutorProcessControl().getTargetTriple());
  73
  74     auto DL = JTMB.getDefaultDataLayoutForTarget();
  75     if (!DL)
  76       return DL.takeError();
  77
  78     return std::make_unique<KaleidoscopeJIT>(std::move(ES), std::move(JTMB),
  79                                              std::move(*DL));
  80   }
  81
  82   const DataLayout &getDataLayout() const { return DL; }
  83
  84   JITDylib &getMainJITDylib() { return MainJD; }
  85
  86   Error addModule(ThreadSafeModule TSM, ResourceTrackerSP RT = nullptr) {
  87     if (!RT)
  88       RT = MainJD.getDefaultResourceTracker();
  89     return CompileLayer.add(RT, std::move(TSM));
  90   }
  91
  92   Expected<JITEvaluatedSymbol> lookup(StringRef Name) {
  93     return ES->lookup({&MainJD}, Mangle(Name.str()));
  94   }
  95 };
  96
  97 } // end namespace orc
  98 } // end namespace llvm
  99
 100 #endif // LLVM_EXECUTIONENGINE_ORC_KALEIDOSCOPEJIT_H