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