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_MCJIT_H
11 #define LLVM_LIB_EXECUTIONENGINE_MCJIT_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 = nullptr) 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);
106 typedef llvm::SmallPtrSet<Module *, 4> ModulePtrSet;
108 class OwningModuleContainer {
110 OwningModuleContainer() {
112 ~OwningModuleContainer() {
113 freeModulePtrSet(AddedModules);
114 freeModulePtrSet(LoadedModules);
115 freeModulePtrSet(FinalizedModules);
118 ModulePtrSet::iterator begin_added() { return AddedModules.begin(); }
119 ModulePtrSet::iterator end_added() { return AddedModules.end(); }
121 ModulePtrSet::iterator begin_loaded() { return LoadedModules.begin(); }
122 ModulePtrSet::iterator end_loaded() { return LoadedModules.end(); }
124 ModulePtrSet::iterator begin_finalized() { return FinalizedModules.begin(); }
125 ModulePtrSet::iterator end_finalized() { return FinalizedModules.end(); }
127 void addModule(Module *M) {
128 AddedModules.insert(M);
131 bool removeModule(Module *M) {
132 return AddedModules.erase(M) || LoadedModules.erase(M) ||
133 FinalizedModules.erase(M);
136 bool hasModuleBeenAddedButNotLoaded(Module *M) {
137 return AddedModules.count(M) != 0;
140 bool hasModuleBeenLoaded(Module *M) {
141 // If the module is in either the "loaded" or "finalized" sections it
143 return (LoadedModules.count(M) != 0 ) || (FinalizedModules.count(M) != 0);
146 bool hasModuleBeenFinalized(Module *M) {
147 return FinalizedModules.count(M) != 0;
150 bool ownsModule(Module* M) {
151 return (AddedModules.count(M) != 0) || (LoadedModules.count(M) != 0) ||
152 (FinalizedModules.count(M) != 0);
155 void markModuleAsLoaded(Module *M) {
156 // This checks against logic errors in the MCJIT implementation.
157 // This function should never be called with either a Module that MCJIT
158 // does not own or a Module that has already been loaded and/or finalized.
159 assert(AddedModules.count(M) &&
160 "markModuleAsLoaded: Module not found in AddedModules");
162 // Remove the module from the "Added" set.
163 AddedModules.erase(M);
165 // Add the Module to the "Loaded" set.
166 LoadedModules.insert(M);
169 void markModuleAsFinalized(Module *M) {
170 // This checks against logic errors in the MCJIT implementation.
171 // This function should never be called with either a Module that MCJIT
172 // does not own, a Module that has not been loaded or a Module that has
173 // already been finalized.
174 assert(LoadedModules.count(M) &&
175 "markModuleAsFinalized: Module not found in LoadedModules");
177 // Remove the module from the "Loaded" section of the list.
178 LoadedModules.erase(M);
180 // Add the Module to the "Finalized" section of the list by inserting it
181 // before the 'end' iterator.
182 FinalizedModules.insert(M);
185 void markAllLoadedModulesAsFinalized() {
186 for (ModulePtrSet::iterator I = LoadedModules.begin(),
187 E = LoadedModules.end();
190 FinalizedModules.insert(M);
192 LoadedModules.clear();
196 ModulePtrSet AddedModules;
197 ModulePtrSet LoadedModules;
198 ModulePtrSet FinalizedModules;
200 void freeModulePtrSet(ModulePtrSet& MPS) {
201 // Go through the module set and delete everything.
202 for (ModulePtrSet::iterator I = MPS.begin(), E = MPS.end(); I != E; ++I) {
212 LinkingMemoryManager MemMgr;
214 SmallVector<JITEventListener*, 2> EventListeners;
216 OwningModuleContainer OwnedModules;
218 SmallVector<std::unique_ptr<object::Archive>, 2> Archives;
220 typedef SmallVector<ObjectImage *, 2> LoadedObjectList;
221 LoadedObjectList LoadedObjects;
223 // An optional ObjectCache to be notified of compiled objects and used to
224 // perform lookup of pre-compiled code to avoid re-compilation.
225 ObjectCache *ObjCache;
227 Function *FindFunctionNamedInModulePtrSet(const char *FnName,
228 ModulePtrSet::iterator I,
229 ModulePtrSet::iterator E);
231 void runStaticConstructorsDestructorsInModulePtrSet(bool isDtors,
232 ModulePtrSet::iterator I,
233 ModulePtrSet::iterator E);
238 /// @name ExecutionEngine interface implementation
240 void addModule(Module *M) override;
241 void addObjectFile(std::unique_ptr<object::ObjectFile> O) override;
242 void addArchive(std::unique_ptr<object::Archive> O) override;
243 bool removeModule(Module *M) override;
245 /// FindFunctionNamed - Search all of the active modules to find the one that
246 /// defines FnName. This is very slow operation and shouldn't be used for
248 Function *FindFunctionNamed(const char *FnName) override;
250 /// Sets the object manager that MCJIT should use to avoid compilation.
251 void setObjectCache(ObjectCache *manager) override;
253 void setProcessAllSections(bool ProcessAllSections) override {
254 Dyld.setProcessAllSections(ProcessAllSections);
257 void generateCodeForModule(Module *M) override;
259 /// finalizeObject - ensure the module is fully processed and is usable.
261 /// It is the user-level function for completing the process of making the
262 /// object usable for execution. It should be called after sections within an
263 /// object have been relocated using mapSectionAddress. When this method is
264 /// called the MCJIT execution engine will reapply relocations for a loaded
266 /// Is it OK to finalize a set of modules, add modules and finalize again.
267 // FIXME: Do we really need both of these?
268 void finalizeObject() override;
269 virtual void finalizeModule(Module *);
270 void finalizeLoadedModules();
272 /// runStaticConstructorsDestructors - This method is used to execute all of
273 /// the static constructors or destructors for a program.
275 /// \param isDtors - Run the destructors instead of constructors.
276 void runStaticConstructorsDestructors(bool isDtors) override;
278 void *getPointerToBasicBlock(BasicBlock *BB) override;
280 void *getPointerToFunction(Function *F) override;
282 void *recompileAndRelinkFunction(Function *F) override;
284 void freeMachineCodeForFunction(Function *F) override;
286 GenericValue runFunction(Function *F,
287 const std::vector<GenericValue> &ArgValues) override;
289 /// getPointerToNamedFunction - This method returns the address of the
290 /// specified function by using the dlsym function call. As such it is only
291 /// useful for resolving library symbols, not code generated symbols.
293 /// If AbortOnFailure is false and no function with the given name is
294 /// found, this function silently returns a null pointer. Otherwise,
295 /// it prints a message to stderr and aborts.
297 void *getPointerToNamedFunction(const std::string &Name,
298 bool AbortOnFailure = true) override;
300 /// mapSectionAddress - map a section to its target address space value.
301 /// Map the address of a JIT section as returned from the memory manager
302 /// to the address in the target process as the running code will see it.
303 /// This is the address which will be used for relocation resolution.
304 void mapSectionAddress(const void *LocalAddress,
305 uint64_t TargetAddress) override {
306 Dyld.mapSectionAddress(LocalAddress, TargetAddress);
308 void RegisterJITEventListener(JITEventListener *L) override;
309 void UnregisterJITEventListener(JITEventListener *L) override;
311 // If successful, these function will implicitly finalize all loaded objects.
312 // To get a function address within MCJIT without causing a finalize, use
314 uint64_t getGlobalValueAddress(const std::string &Name) override;
315 uint64_t getFunctionAddress(const std::string &Name) override;
317 TargetMachine *getTargetMachine() override { return TM; }
320 /// @name (Private) Registration Interfaces
323 static void Register() {
324 MCJITCtor = createJIT;
327 static ExecutionEngine *createJIT(Module *M,
328 std::string *ErrorStr,
329 RTDyldMemoryManager *MemMgr,
334 // This is not directly exposed via the ExecutionEngine API, but it is
335 // used by the LinkingMemoryManager.
336 uint64_t getSymbolAddress(const std::string &Name,
337 bool CheckFunctionsOnly);
340 /// emitObject -- Generate a JITed object in memory from the specified module
341 /// Currently, MCJIT only supports a single module and the module passed to
342 /// this function call is expected to be the contained module. The module
343 /// is passed as a parameter here to prepare for multiple module support in
345 ObjectBufferStream* emitObject(Module *M);
347 void NotifyObjectEmitted(const ObjectImage& Obj);
348 void NotifyFreeingObject(const ObjectImage& Obj);
350 uint64_t getExistingSymbolAddress(const std::string &Name);
351 Module *findModuleForSymbol(const std::string &Name,
352 bool CheckFunctionsOnly);
355 } // End llvm namespace