1 //===-- MCJIT.h - Class definition for the MCJIT ----------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 #ifndef LLVM_LIB_EXECUTIONENGINE_MCJIT_H
11 #define LLVM_LIB_EXECUTIONENGINE_MCJIT_H
13 #include "llvm/ADT/DenseMap.h"
14 #include "llvm/ADT/SmallVector.h"
15 #include "llvm/ExecutionEngine/ExecutionEngine.h"
16 #include "llvm/ExecutionEngine/ObjectCache.h"
17 #include "llvm/ExecutionEngine/ObjectImage.h"
18 #include "llvm/ExecutionEngine/RuntimeDyld.h"
19 #include "llvm/PassManager.h"
25 // This is a helper class that the MCJIT execution engine uses for linking
26 // functions across modules that it owns. It aggregates the memory manager
27 // that is passed in to the MCJIT constructor and defers most functionality
29 class LinkingMemoryManager : public RTDyldMemoryManager {
31 LinkingMemoryManager(MCJIT *Parent, RTDyldMemoryManager *MM)
32 : ParentEngine(Parent), ClientMM(MM) {}
34 virtual uint64_t getSymbolAddress(const std::string &Name);
36 // Functions deferred to client memory manager
37 virtual uint8_t *allocateCodeSection(uintptr_t Size, unsigned Alignment,
38 unsigned SectionID, StringRef SectionName) {
39 return ClientMM->allocateCodeSection(Size, Alignment, SectionID, SectionName);
42 virtual uint8_t *allocateDataSection(uintptr_t Size, unsigned Alignment,
43 unsigned SectionID, StringRef SectionName,
45 return ClientMM->allocateDataSection(Size, Alignment,
46 SectionID, SectionName, IsReadOnly);
49 virtual void notifyObjectLoaded(ExecutionEngine *EE,
50 const ObjectImage *Obj) {
51 ClientMM->notifyObjectLoaded(EE, Obj);
54 virtual void registerEHFrames(uint8_t *Addr, uint64_t LoadAddr, size_t Size) {
55 ClientMM->registerEHFrames(Addr, LoadAddr, Size);
58 virtual void deregisterEHFrames(uint8_t *Addr,
61 ClientMM->deregisterEHFrames(Addr, LoadAddr, Size);
64 virtual bool finalizeMemory(std::string *ErrMsg = 0) {
65 return ClientMM->finalizeMemory(ErrMsg);
70 OwningPtr<RTDyldMemoryManager> ClientMM;
73 // FIXME: This makes all kinds of horrible assumptions for the time being,
74 // like only having one module, not needing to worry about multi-threading,
75 // blah blah. Purely in get-it-up-and-limping mode for now.
77 // About Module states:
79 // The purpose of the "added" state is having modules in standby. (added=known
80 // but not compiled). The idea is that you can add a module to provide function
81 // definitions but if nothing in that module is referenced by a module in which
82 // a function is executed (note the wording here because it
\92s not exactly the
83 // ideal case) then the module never gets compiled. This is sort of lazy
86 // The purpose of the "loaded" state (loaded=compiled and required sections
87 // copied into local memory but not yet ready for execution) is to have an
88 // intermediate state wherein clients can remap the addresses of sections, using
89 // MCJIT::mapSectionAddress, (in preparation for later copying to a new location
90 // or an external process) before relocations and page permissions are applied.
92 // It might not be obvious at first glance, but the "remote-mcjit" case in the
93 // lli tool does this. In that case, the intermediate action is taken by the
94 // RemoteMemoryManager in response to the notifyObjectLoaded function being
97 class MCJIT : public ExecutionEngine {
98 MCJIT(Module *M, TargetMachine *tm, RTDyldMemoryManager *MemMgr,
99 bool AllocateGVsWithCode);
110 class MCJITModuleState {
112 MCJITModuleState() : State(ModuleAdded) {}
114 MCJITModuleState & operator=(ModuleState s) { State = s; return *this; }
115 bool hasBeenEmitted() { return State != ModuleAdded; }
116 bool hasBeenLoaded() { return State != ModuleAdded &&
117 State != ModuleEmitted; }
118 bool hasBeenFinalized() { return State == ModuleFinalized; }
126 LinkingMemoryManager MemMgr;
128 SmallVector<JITEventListener*, 2> EventListeners;
130 typedef DenseMap<Module *, MCJITModuleState> ModuleStateMap;
131 ModuleStateMap ModuleStates;
133 typedef DenseMap<Module *, ObjectImage *> LoadedObjectMap;
134 LoadedObjectMap LoadedObjects;
136 // An optional ObjectCache to be notified of compiled objects and used to
137 // perform lookup of pre-compiled code to avoid re-compilation.
138 ObjectCache *ObjCache;
143 /// @name ExecutionEngine interface implementation
145 virtual void addModule(Module *M);
147 /// Sets the object manager that MCJIT should use to avoid compilation.
148 virtual void setObjectCache(ObjectCache *manager);
150 virtual void generateCodeForModule(Module *M);
152 /// finalizeObject - ensure the module is fully processed and is usable.
154 /// It is the user-level function for completing the process of making the
155 /// object usable for execution. It should be called after sections within an
156 /// object have been relocated using mapSectionAddress. When this method is
157 /// called the MCJIT execution engine will reapply relocations for a loaded
159 /// Is it OK to finalize a set of modules, add modules and finalize again.
160 /// FIXME: Do we really need both of these?
161 virtual void finalizeObject();
162 virtual void finalizeModule(Module *);
163 void finalizeLoadedModules();
165 virtual void *getPointerToBasicBlock(BasicBlock *BB);
167 virtual void *getPointerToFunction(Function *F);
169 virtual void *recompileAndRelinkFunction(Function *F);
171 virtual void freeMachineCodeForFunction(Function *F);
173 virtual GenericValue runFunction(Function *F,
174 const std::vector<GenericValue> &ArgValues);
176 /// getPointerToNamedFunction - This method returns the address of the
177 /// specified function by using the dlsym function call. As such it is only
178 /// useful for resolving library symbols, not code generated symbols.
180 /// If AbortOnFailure is false and no function with the given name is
181 /// found, this function silently returns a null pointer. Otherwise,
182 /// it prints a message to stderr and aborts.
184 virtual void *getPointerToNamedFunction(const std::string &Name,
185 bool AbortOnFailure = true);
187 /// mapSectionAddress - map a section to its target address space value.
188 /// Map the address of a JIT section as returned from the memory manager
189 /// to the address in the target process as the running code will see it.
190 /// This is the address which will be used for relocation resolution.
191 virtual void mapSectionAddress(const void *LocalAddress,
192 uint64_t TargetAddress) {
193 Dyld.mapSectionAddress(LocalAddress, TargetAddress);
195 virtual void RegisterJITEventListener(JITEventListener *L);
196 virtual void UnregisterJITEventListener(JITEventListener *L);
198 // If successful, these function will implicitly finalize all loaded objects.
199 // To get a function address within MCJIT without causing a finalize, use
201 virtual uint64_t getGlobalValueAddress(const std::string &Name);
202 virtual uint64_t getFunctionAddress(const std::string &Name);
205 /// @name (Private) Registration Interfaces
208 static void Register() {
209 MCJITCtor = createJIT;
212 static ExecutionEngine *createJIT(Module *M,
213 std::string *ErrorStr,
214 RTDyldMemoryManager *MemMgr,
220 // This is not directly exposed via the ExecutionEngine API, but it is
221 // used by the LinkingMemoryManager.
222 uint64_t getSymbolAddress(const std::string &Name,
223 bool CheckFunctionsOnly);
226 /// emitObject -- Generate a JITed object in memory from the specified module
227 /// Currently, MCJIT only supports a single module and the module passed to
228 /// this function call is expected to be the contained module. The module
229 /// is passed as a parameter here to prepare for multiple module support in
231 ObjectBufferStream* emitObject(Module *M);
233 void NotifyObjectEmitted(const ObjectImage& Obj);
234 void NotifyFreeingObject(const ObjectImage& Obj);
236 uint64_t getExistingSymbolAddress(const std::string &Name);
237 Module *findModuleForSymbol(const std::string &Name,
238 bool CheckFunctionsOnly);
241 } // End llvm namespace