1 //===------ IRCompileLayer.h -- Eagerly compile IR for JIT ------*- C++ -*-===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // Contains the definition for a basic, eagerly compiling layer of the JIT. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #ifndef LLVM_EXECUTIONENGINE_ORC_IRCOMPILELAYER_H 15 #define LLVM_EXECUTIONENGINE_ORC_IRCOMPILELAYER_H 16 17 #include "JITSymbol.h" 18 #include "llvm/ExecutionEngine/ObjectCache.h" 19 #include "llvm/ExecutionEngine/RTDyldMemoryManager.h" 20 #include "llvm/Object/ObjectFile.h" 21 #include <memory> 22 23 namespace llvm { 24 namespace orc { 25 26 /// @brief Eager IR compiling layer. 27 /// 28 /// This layer accepts sets of LLVM IR Modules (via addModuleSet). It 29 /// immediately compiles each IR module to an object file (each IR Module is 30 /// compiled separately). The resulting set of object files is then added to 31 /// the layer below, which must implement the object layer concept. 32 template <typename BaseLayerT> class IRCompileLayer { 33 public: 34 typedef std::function<object::OwningBinary<object::ObjectFile>(Module &)> 35 CompileFtor; 36 37 private: 38 typedef typename BaseLayerT::ObjSetHandleT ObjSetHandleT; 39 40 typedef std::vector<std::unique_ptr<object::ObjectFile>> OwningObjectVec; 41 typedef std::vector<std::unique_ptr<MemoryBuffer>> OwningBufferVec; 42 43 public: 44 /// @brief Handle to a set of compiled modules. 45 typedef ObjSetHandleT ModuleSetHandleT; 46 47 /// @brief Construct an IRCompileLayer with the given BaseLayer, which must 48 /// implement the ObjectLayer concept. IRCompileLayer(BaseLayerT & BaseLayer,CompileFtor Compile)49 IRCompileLayer(BaseLayerT &BaseLayer, CompileFtor Compile) 50 : BaseLayer(BaseLayer), Compile(std::move(Compile)), ObjCache(nullptr) {} 51 52 /// @brief Set an ObjectCache to query before compiling. setObjectCache(ObjectCache * NewCache)53 void setObjectCache(ObjectCache *NewCache) { ObjCache = NewCache; } 54 55 /// @brief Compile each module in the given module set, then add the resulting 56 /// set of objects to the base layer along with the memory manager and 57 /// symbol resolver. 58 /// 59 /// @return A handle for the added modules. 60 template <typename ModuleSetT, typename MemoryManagerPtrT, 61 typename SymbolResolverPtrT> addModuleSet(ModuleSetT Ms,MemoryManagerPtrT MemMgr,SymbolResolverPtrT Resolver)62 ModuleSetHandleT addModuleSet(ModuleSetT Ms, 63 MemoryManagerPtrT MemMgr, 64 SymbolResolverPtrT Resolver) { 65 OwningObjectVec Objects; 66 OwningBufferVec Buffers; 67 68 for (const auto &M : Ms) { 69 std::unique_ptr<object::ObjectFile> Object; 70 std::unique_ptr<MemoryBuffer> Buffer; 71 72 if (ObjCache) 73 std::tie(Object, Buffer) = tryToLoadFromObjectCache(*M).takeBinary(); 74 75 if (!Object) { 76 std::tie(Object, Buffer) = Compile(*M).takeBinary(); 77 if (ObjCache) 78 ObjCache->notifyObjectCompiled(&*M, Buffer->getMemBufferRef()); 79 } 80 81 Objects.push_back(std::move(Object)); 82 Buffers.push_back(std::move(Buffer)); 83 } 84 85 ModuleSetHandleT H = 86 BaseLayer.addObjectSet(Objects, std::move(MemMgr), std::move(Resolver)); 87 88 BaseLayer.takeOwnershipOfBuffers(H, std::move(Buffers)); 89 90 return H; 91 } 92 93 /// @brief Remove the module set associated with the handle H. removeModuleSet(ModuleSetHandleT H)94 void removeModuleSet(ModuleSetHandleT H) { BaseLayer.removeObjectSet(H); } 95 96 /// @brief Search for the given named symbol. 97 /// @param Name The name of the symbol to search for. 98 /// @param ExportedSymbolsOnly If true, search only for exported symbols. 99 /// @return A handle for the given named symbol, if it exists. findSymbol(const std::string & Name,bool ExportedSymbolsOnly)100 JITSymbol findSymbol(const std::string &Name, bool ExportedSymbolsOnly) { 101 return BaseLayer.findSymbol(Name, ExportedSymbolsOnly); 102 } 103 104 /// @brief Get the address of the given symbol in the context of the set of 105 /// compiled modules represented by the handle H. This call is 106 /// forwarded to the base layer's implementation. 107 /// @param H The handle for the module set to search in. 108 /// @param Name The name of the symbol to search for. 109 /// @param ExportedSymbolsOnly If true, search only for exported symbols. 110 /// @return A handle for the given named symbol, if it is found in the 111 /// given module set. findSymbolIn(ModuleSetHandleT H,const std::string & Name,bool ExportedSymbolsOnly)112 JITSymbol findSymbolIn(ModuleSetHandleT H, const std::string &Name, 113 bool ExportedSymbolsOnly) { 114 return BaseLayer.findSymbolIn(H, Name, ExportedSymbolsOnly); 115 } 116 117 /// @brief Immediately emit and finalize the moduleOB set represented by the 118 /// given handle. 119 /// @param H Handle for module set to emit/finalize. emitAndFinalize(ModuleSetHandleT H)120 void emitAndFinalize(ModuleSetHandleT H) { 121 BaseLayer.emitAndFinalize(H); 122 } 123 124 private: 125 object::OwningBinary<object::ObjectFile> tryToLoadFromObjectCache(const Module & M)126 tryToLoadFromObjectCache(const Module &M) { 127 std::unique_ptr<MemoryBuffer> ObjBuffer = ObjCache->getObject(&M); 128 if (!ObjBuffer) 129 return object::OwningBinary<object::ObjectFile>(); 130 131 ErrorOr<std::unique_ptr<object::ObjectFile>> Obj = 132 object::ObjectFile::createObjectFile(ObjBuffer->getMemBufferRef()); 133 if (!Obj) 134 return object::OwningBinary<object::ObjectFile>(); 135 136 return object::OwningBinary<object::ObjectFile>(std::move(*Obj), 137 std::move(ObjBuffer)); 138 } 139 140 BaseLayerT &BaseLayer; 141 CompileFtor Compile; 142 ObjectCache *ObjCache; 143 }; 144 145 } // End namespace orc. 146 } // End namespace llvm. 147 148 #endif // LLVM_EXECUTIONENGINE_ORC_IRCOMPILINGLAYER_H 149