[Kaleidoscope][BuildingAJIT] Add code for the 2nd chapter of the Buil…

…dingAJIT

tutorial.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@270794 91177308-0d34-0410-b5e6-96231b3b80d8

examples/Kaleidoscope/BuildingAJIT/CMakeLists.txt

@@ -1 +1,3 @@
 add_subdirectory(Chapter1)
+add_subdirectory(Chapter2)
+

examples/Kaleidoscope/BuildingAJIT/Chapter2/CMakeLists.txt

@@ -0,0 +1,17 @@
+set(LLVM_LINK_COMPONENTS
+  Analysis
+  Core
+  ExecutionEngine
+  InstCombine
+  Object
+  RuntimeDyld
+  ScalarOpts
+  Support
+  native
+  )
+
+add_kaleidoscope_chapter(BuildingAJIT-Ch2
+  toy.cpp
+  )
+
+export_executable_symbols(BuildingAJIT-Ch2)

examples/Kaleidoscope/BuildingAJIT/Chapter2/KaleidoscopeJIT.h

@@ -0,0 +1,131 @@
+//===----- KaleidoscopeJIT.h - A simple JIT for Kaleidoscope ----*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// Contains a simple JIT definition for use in the kaleidoscope tutorials.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_EXECUTIONENGINE_ORC_KALEIDOSCOPEJIT_H
+#define LLVM_EXECUTIONENGINE_ORC_KALEIDOSCOPEJIT_H
+
+#include "llvm/ADT/STLExtras.h"
+#include "llvm/ExecutionEngine/ExecutionEngine.h"
+#include "llvm/ExecutionEngine/RuntimeDyld.h"
+#include "llvm/ExecutionEngine/SectionMemoryManager.h"
+#include "llvm/ExecutionEngine/Orc/CompileUtils.h"
+#include "llvm/ExecutionEngine/Orc/JITSymbol.h"
+#include "llvm/ExecutionEngine/Orc/IRCompileLayer.h"
+#include "llvm/ExecutionEngine/Orc/IRTransformLayer.h"
+#include "llvm/ExecutionEngine/Orc/LambdaResolver.h"
+#include "llvm/ExecutionEngine/Orc/ObjectLinkingLayer.h"
+#include "llvm/IR/DataLayout.h"
+#include "llvm/IR/Mangler.h"
+#include "llvm/Support/DynamicLibrary.h"
+#include "llvm/Support/raw_ostream.h"
+#include "llvm/Target/TargetMachine.h"
+#include <algorithm>
+#include <memory>
+#include <string>
+#include <vector>
+
+namespace llvm {
+namespace orc {
+
+class KaleidoscopeJIT {
+private:
+  std::unique_ptr<TargetMachine> TM;
+  const DataLayout DL;
+  ObjectLinkingLayer<> ObjectLayer;
+  IRCompileLayer<decltype(ObjectLayer)> CompileLayer;
+
+  typedef std::function<std::unique_ptr<Module>(std::unique_ptr<Module>)>
+    OptimizeFunction;
+
+  IRTransformLayer<decltype(CompileLayer), OptimizeFunction> OptimizeLayer;
+
+public:
+  typedef decltype(OptimizeLayer)::ModuleSetHandleT ModuleHandle;
+
+  KaleidoscopeJIT()
+      : TM(EngineBuilder().selectTarget()), DL(TM->createDataLayout()),
+        CompileLayer(ObjectLayer, SimpleCompiler(*TM)),
+        OptimizeLayer(CompileLayer,
+                      [this](std::unique_ptr<Module> M) {
+                        return optimizeModule(std::move(M));
+                      }) {
+    llvm::sys::DynamicLibrary::LoadLibraryPermanently(nullptr);
+  }
+
+  TargetMachine &getTargetMachine() { return *TM; }
+
+  ModuleHandle addModule(std::unique_ptr<Module> M) {
+    // Build our symbol resolver:
+    // Lambda 1: Look back into the JIT itself to find symbols that are part of
+    //           the same "logical dylib".
+    // Lambda 2: Search for external symbols in the host process.
+    auto Resolver = createLambdaResolver(
+        [&](const std::string &Name) {
+          if (auto Sym = CompileLayer.findSymbol(Name, false))
+            return RuntimeDyld::SymbolInfo(Sym.getAddress(), Sym.getFlags());
+          return RuntimeDyld::SymbolInfo(nullptr);
+        },
+        [](const std::string &Name) {
+          if (auto SymAddr =
+                RTDyldMemoryManager::getSymbolAddressInProcess(Name))
+            return RuntimeDyld::SymbolInfo(SymAddr, JITSymbolFlags::Exported);
+          return RuntimeDyld::SymbolInfo(nullptr);
+        });
+
+    // Build a singlton module set to hold our module.
+    std::vector<std::unique_ptr<Module>> Ms;
+    Ms.push_back(std::move(M));
+
+    // Add the set to the JIT with the resolver we created above and a newly
+    // created SectionMemoryManager.
+    return OptimizeLayer.addModuleSet(std::move(Ms),
+                                      make_unique<SectionMemoryManager>(),
+                                      std::move(Resolver));
+  }
+
+  JITSymbol findSymbol(const std::string Name) {
+    std::string MangledName;
+    raw_string_ostream MangledNameStream(MangledName);
+    Mangler::getNameWithPrefix(MangledNameStream, Name, DL);
+    return OptimizeLayer.findSymbol(MangledNameStream.str(), true);
+  }
+
+  void removeModule(ModuleHandle H) {
+    OptimizeLayer.removeModuleSet(H);
+  }
+
+  std::unique_ptr<Module> optimizeModule(std::unique_ptr<Module> M) {
+    // Create a function pass manager.
+    auto FPM = llvm::make_unique<legacy::FunctionPassManager>(M.get());
+
+    // Add some optimizations.
+    FPM->add(createInstructionCombiningPass());
+    FPM->add(createReassociatePass());
+    FPM->add(createGVNPass());
+    FPM->add(createCFGSimplificationPass());
+    FPM->doInitialization();
+
+    // Run the optimizations over all functions in the module being added to
+    // the JIT.
+    for (auto &F : *M)
+      FPM->run(F);
+
+    return M;
+  }
+
+};
+
+} // end namespace orc
+} // end namespace llvm
+
+#endif // LLVM_EXECUTIONENGINE_ORC_KALEIDOSCOPEJIT_H