forked from OSchip/llvm-project
142 lines
4.9 KiB
C++
142 lines
4.9 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/ADT/iterator_range.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/Orc/CompileUtils.h"
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#include "llvm/ExecutionEngine/Orc/IRCompileLayer.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/ExecutionEngine/RTDyldMemoryManager.h"
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#include "llvm/ExecutionEngine/SectionMemoryManager.h"
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#include "llvm/IR/DataLayout.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/Support/raw_ostream.h"
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#include "llvm/Target/TargetMachine.h"
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#include <algorithm>
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#include <map>
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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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public:
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using ObjLayerT = RTDyldObjectLinkingLayer;
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using CompileLayerT = IRCompileLayer<ObjLayerT, SimpleCompiler>;
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KaleidoscopeJIT()
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: Resolver(createLegacyLookupResolver(
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ES,
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[this](const std::string &Name) {
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return ObjectLayer.findSymbol(Name, true);
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},
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[](Error Err) { cantFail(std::move(Err), "lookupFlags failed"); })),
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TM(EngineBuilder().selectTarget()), DL(TM->createDataLayout()),
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ObjectLayer(ES,
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[this](VModuleKey) {
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return ObjLayerT::Resources{
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std::make_shared<SectionMemoryManager>(), Resolver};
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}),
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CompileLayer(ObjectLayer, SimpleCompiler(*TM)) {
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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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VModuleKey addModule(std::unique_ptr<Module> M) {
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auto K = ES.allocateVModule();
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cantFail(CompileLayer.addModule(K, std::move(M)));
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ModuleKeys.push_back(K);
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return K;
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}
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void removeModule(VModuleKey K) {
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ModuleKeys.erase(find(ModuleKeys, K));
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cantFail(CompileLayer.removeModule(K));
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}
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JITSymbol findSymbol(const std::string Name) {
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return findMangledSymbol(mangle(Name));
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}
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private:
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std::string mangle(const std::string &Name) {
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std::string MangledName;
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{
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raw_string_ostream MangledNameStream(MangledName);
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Mangler::getNameWithPrefix(MangledNameStream, Name, DL);
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}
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return MangledName;
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}
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JITSymbol findMangledSymbol(const std::string &Name) {
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#ifdef _WIN32
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// The symbol lookup of ObjectLinkingLayer uses the SymbolRef::SF_Exported
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// flag to decide whether a symbol will be visible or not, when we call
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// IRCompileLayer::findSymbolIn with ExportedSymbolsOnly set to true.
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//
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// But for Windows COFF objects, this flag is currently never set.
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// For a potential solution see: https://reviews.llvm.org/rL258665
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// For now, we allow non-exported symbols on Windows as a workaround.
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const bool ExportedSymbolsOnly = false;
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#else
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const bool ExportedSymbolsOnly = true;
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#endif
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// Search modules in reverse order: from last added to first added.
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// This is the opposite of the usual search order for dlsym, but makes more
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// sense in a REPL where we want to bind to the newest available definition.
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for (auto H : make_range(ModuleKeys.rbegin(), ModuleKeys.rend()))
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if (auto Sym = CompileLayer.findSymbolIn(H, Name, ExportedSymbolsOnly))
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return Sym;
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// If we can't find the symbol in the JIT, try looking in the host process.
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if (auto SymAddr = RTDyldMemoryManager::getSymbolAddressInProcess(Name))
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return JITSymbol(SymAddr, JITSymbolFlags::Exported);
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#ifdef _WIN32
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// For Windows retry without "_" at beginning, as RTDyldMemoryManager uses
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// GetProcAddress and standard libraries like msvcrt.dll use names
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// with and without "_" (for example "_itoa" but "sin").
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if (Name.length() > 2 && Name[0] == '_')
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if (auto SymAddr =
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RTDyldMemoryManager::getSymbolAddressInProcess(Name.substr(1)))
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return JITSymbol(SymAddr, JITSymbolFlags::Exported);
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#endif
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return nullptr;
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}
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ExecutionSession ES;
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std::shared_ptr<SymbolResolver> Resolver;
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std::unique_ptr<TargetMachine> TM;
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const DataLayout DL;
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ObjLayerT ObjectLayer;
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CompileLayerT CompileLayer;
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std::vector<VModuleKey> ModuleKeys;
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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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