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/SmallPtrSet.h"
15 #include "llvm/ADT/SmallVector.h"
16 #include "llvm/ExecutionEngine/ExecutionEngine.h"
17 #include "llvm/ExecutionEngine/ObjectCache.h"
18 #include "llvm/ExecutionEngine/ObjectImage.h"
19 #include "llvm/ExecutionEngine/RuntimeDyld.h"
20 #include "llvm/IR/Module.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 uint64_t getSymbolAddress(const std::string &Name) override;
36 // Functions deferred to client memory manager
37 uint8_t *allocateCodeSection(uintptr_t Size, unsigned Alignment,
39 StringRef SectionName) override {
40 return ClientMM->allocateCodeSection(Size, Alignment, SectionID, SectionName);
43 uint8_t *allocateDataSection(uintptr_t Size, unsigned Alignment,
44 unsigned SectionID, StringRef SectionName,
45 bool IsReadOnly) override {
46 return ClientMM->allocateDataSection(Size, Alignment,
47 SectionID, SectionName, IsReadOnly);
50 void reserveAllocationSpace(uintptr_t CodeSize, uintptr_t DataSizeRO,
51 uintptr_t DataSizeRW) override {
52 return ClientMM->reserveAllocationSpace(CodeSize, DataSizeRO, DataSizeRW);
55 bool needsToReserveAllocationSpace() override {
56 return ClientMM->needsToReserveAllocationSpace();
59 void notifyObjectLoaded(ExecutionEngine *EE,
60 const ObjectImage *Obj) override {
61 ClientMM->notifyObjectLoaded(EE, Obj);
64 void registerEHFrames(uint8_t *Addr, uint64_t LoadAddr,
65 size_t Size) override {
66 ClientMM->registerEHFrames(Addr, LoadAddr, Size);
69 void deregisterEHFrames(uint8_t *Addr, uint64_t LoadAddr,
70 size_t Size) override {
71 ClientMM->deregisterEHFrames(Addr, LoadAddr, Size);
74 bool finalizeMemory(std::string *ErrMsg = 0) override {
75 return ClientMM->finalizeMemory(ErrMsg);
80 std::unique_ptr<RTDyldMemoryManager> ClientMM;
83 // About Module states: added->loaded->finalized.
85 // The purpose of the "added" state is having modules in standby. (added=known
86 // but not compiled). The idea is that you can add a module to provide function
87 // definitions but if nothing in that module is referenced by a module in which
88 // a function is executed (note the wording here because it's not exactly the
89 // ideal case) then the module never gets compiled. This is sort of lazy
92 // The purpose of the "loaded" state (loaded=compiled and required sections
93 // copied into local memory but not yet ready for execution) is to have an
94 // intermediate state wherein clients can remap the addresses of sections, using
95 // MCJIT::mapSectionAddress, (in preparation for later copying to a new location
96 // or an external process) before relocations and page permissions are applied.
98 // It might not be obvious at first glance, but the "remote-mcjit" case in the
99 // lli tool does this. In that case, the intermediate action is taken by the
100 // RemoteMemoryManager in response to the notifyObjectLoaded function being
103 class MCJIT : public ExecutionEngine {
104 MCJIT(Module *M, TargetMachine *tm, RTDyldMemoryManager *MemMgr,
105 bool AllocateGVsWithCode);
107 typedef llvm::SmallPtrSet<Module *, 4> ModulePtrSet;
109 class OwningModuleContainer {
111 OwningModuleContainer() {
113 ~OwningModuleContainer() {
114 freeModulePtrSet(AddedModules);
115 freeModulePtrSet(LoadedModules);
116 freeModulePtrSet(FinalizedModules);
119 ModulePtrSet::iterator begin_added() { return AddedModules.begin(); }
120 ModulePtrSet::iterator end_added() { return AddedModules.end(); }
122 ModulePtrSet::iterator begin_loaded() { return LoadedModules.begin(); }
123 ModulePtrSet::iterator end_loaded() { return LoadedModules.end(); }
125 ModulePtrSet::iterator begin_finalized() { return FinalizedModules.begin(); }
126 ModulePtrSet::iterator end_finalized() { return FinalizedModules.end(); }
128 void addModule(Module *M) {
129 AddedModules.insert(M);
132 bool removeModule(Module *M) {
133 return AddedModules.erase(M) || LoadedModules.erase(M) ||
134 FinalizedModules.erase(M);
137 bool hasModuleBeenAddedButNotLoaded(Module *M) {
138 return AddedModules.count(M) != 0;
141 bool hasModuleBeenLoaded(Module *M) {
142 // If the module is in either the "loaded" or "finalized" sections it
144 return (LoadedModules.count(M) != 0 ) || (FinalizedModules.count(M) != 0);
147 bool hasModuleBeenFinalized(Module *M) {
148 return FinalizedModules.count(M) != 0;
151 bool ownsModule(Module* M) {
152 return (AddedModules.count(M) != 0) || (LoadedModules.count(M) != 0) ||
153 (FinalizedModules.count(M) != 0);
156 void markModuleAsLoaded(Module *M) {
157 // This checks against logic errors in the MCJIT implementation.
158 // This function should never be called with either a Module that MCJIT
159 // does not own or a Module that has already been loaded and/or finalized.
160 assert(AddedModules.count(M) &&
161 "markModuleAsLoaded: Module not found in AddedModules");
163 // Remove the module from the "Added" set.
164 AddedModules.erase(M);
166 // Add the Module to the "Loaded" set.
167 LoadedModules.insert(M);
170 void markModuleAsFinalized(Module *M) {
171 // This checks against logic errors in the MCJIT implementation.
172 // This function should never be called with either a Module that MCJIT
173 // does not own, a Module that has not been loaded or a Module that has
174 // already been finalized.
175 assert(LoadedModules.count(M) &&
176 "markModuleAsFinalized: Module not found in LoadedModules");
178 // Remove the module from the "Loaded" section of the list.
179 LoadedModules.erase(M);
181 // Add the Module to the "Finalized" section of the list by inserting it
182 // before the 'end' iterator.
183 FinalizedModules.insert(M);
186 void markAllLoadedModulesAsFinalized() {
187 for (ModulePtrSet::iterator I = LoadedModules.begin(),
188 E = LoadedModules.end();
191 FinalizedModules.insert(M);
193 LoadedModules.clear();
197 ModulePtrSet AddedModules;
198 ModulePtrSet LoadedModules;
199 ModulePtrSet FinalizedModules;
201 void freeModulePtrSet(ModulePtrSet& MPS) {
202 // Go through the module set and delete everything.
203 for (ModulePtrSet::iterator I = MPS.begin(), E = MPS.end(); I != E; ++I) {
213 LinkingMemoryManager MemMgr;
215 SmallVector<JITEventListener*, 2> EventListeners;
217 OwningModuleContainer OwnedModules;
219 SmallVector<object::Archive*, 2> Archives;
221 typedef SmallVector<ObjectImage *, 2> LoadedObjectList;
222 LoadedObjectList LoadedObjects;
224 // An optional ObjectCache to be notified of compiled objects and used to
225 // perform lookup of pre-compiled code to avoid re-compilation.
226 ObjectCache *ObjCache;
228 Function *FindFunctionNamedInModulePtrSet(const char *FnName,
229 ModulePtrSet::iterator I,
230 ModulePtrSet::iterator E);
232 void runStaticConstructorsDestructorsInModulePtrSet(bool isDtors,
233 ModulePtrSet::iterator I,
234 ModulePtrSet::iterator E);
239 /// @name ExecutionEngine interface implementation
241 void addModule(Module *M) override;
242 void addObjectFile(object::ObjectFile *O) override;
243 void addArchive(object::Archive *O) override;
244 bool removeModule(Module *M) override;
246 /// FindFunctionNamed - Search all of the active modules to find the one that
247 /// defines FnName. This is very slow operation and shouldn't be used for
249 Function *FindFunctionNamed(const char *FnName) override;
251 /// Sets the object manager that MCJIT should use to avoid compilation.
252 void setObjectCache(ObjectCache *manager) override;
254 void setProcessAllSections(bool ProcessAllSections) override {
255 Dyld.setProcessAllSections(ProcessAllSections);
258 void generateCodeForModule(Module *M) override;
260 /// finalizeObject - ensure the module is fully processed and is usable.
262 /// It is the user-level function for completing the process of making the
263 /// object usable for execution. It should be called after sections within an
264 /// object have been relocated using mapSectionAddress. When this method is
265 /// called the MCJIT execution engine will reapply relocations for a loaded
267 /// Is it OK to finalize a set of modules, add modules and finalize again.
268 // FIXME: Do we really need both of these?
269 void finalizeObject() override;
270 virtual void finalizeModule(Module *);
271 void finalizeLoadedModules();
273 /// runStaticConstructorsDestructors - This method is used to execute all of
274 /// the static constructors or destructors for a program.
276 /// \param isDtors - Run the destructors instead of constructors.
277 void runStaticConstructorsDestructors(bool isDtors) override;
279 void *getPointerToBasicBlock(BasicBlock *BB) override;
281 void *getPointerToFunction(Function *F) override;
283 void *recompileAndRelinkFunction(Function *F) override;
285 void freeMachineCodeForFunction(Function *F) override;
287 GenericValue runFunction(Function *F,
288 const std::vector<GenericValue> &ArgValues) override;
290 /// getPointerToNamedFunction - This method returns the address of the
291 /// specified function by using the dlsym function call. As such it is only
292 /// useful for resolving library symbols, not code generated symbols.
294 /// If AbortOnFailure is false and no function with the given name is
295 /// found, this function silently returns a null pointer. Otherwise,
296 /// it prints a message to stderr and aborts.
298 void *getPointerToNamedFunction(const std::string &Name,
299 bool AbortOnFailure = true) override;
301 /// mapSectionAddress - map a section to its target address space value.
302 /// Map the address of a JIT section as returned from the memory manager
303 /// to the address in the target process as the running code will see it.
304 /// This is the address which will be used for relocation resolution.
305 void mapSectionAddress(const void *LocalAddress,
306 uint64_t TargetAddress) override {
307 Dyld.mapSectionAddress(LocalAddress, TargetAddress);
309 void RegisterJITEventListener(JITEventListener *L) override;
310 void UnregisterJITEventListener(JITEventListener *L) override;
312 // If successful, these function will implicitly finalize all loaded objects.
313 // To get a function address within MCJIT without causing a finalize, use
315 uint64_t getGlobalValueAddress(const std::string &Name) override;
316 uint64_t getFunctionAddress(const std::string &Name) override;
318 TargetMachine *getTargetMachine() override { return TM; }
321 /// @name (Private) Registration Interfaces
324 static void Register() {
325 MCJITCtor = createJIT;
328 static ExecutionEngine *createJIT(Module *M,
329 std::string *ErrorStr,
330 RTDyldMemoryManager *MemMgr,
336 // This is not directly exposed via the ExecutionEngine API, but it is
337 // used by the LinkingMemoryManager.
338 uint64_t getSymbolAddress(const std::string &Name,
339 bool CheckFunctionsOnly);
342 /// emitObject -- Generate a JITed object in memory from the specified module
343 /// Currently, MCJIT only supports a single module and the module passed to
344 /// this function call is expected to be the contained module. The module
345 /// is passed as a parameter here to prepare for multiple module support in
347 ObjectBufferStream* emitObject(Module *M);
349 void NotifyObjectEmitted(const ObjectImage& Obj);
350 void NotifyFreeingObject(const ObjectImage& Obj);
352 uint64_t getExistingSymbolAddress(const std::string &Name);
353 Module *findModuleForSymbol(const std::string &Name,
354 bool CheckFunctionsOnly);
357 } // End llvm namespace