#ifndef LLVM_LIB_EXECUTIONENGINE_MCJIT_H
#define LLVM_LIB_EXECUTIONENGINE_MCJIT_H
-#include "llvm/PassManager.h"
+#include "llvm/ADT/DenseMap.h"
+#include "llvm/ADT/SmallPtrSet.h"
+#include "llvm/ADT/SmallVector.h"
#include "llvm/ExecutionEngine/ExecutionEngine.h"
+#include "llvm/ExecutionEngine/ObjectCache.h"
+#include "llvm/ExecutionEngine/ObjectImage.h"
#include "llvm/ExecutionEngine/RuntimeDyld.h"
-#include "llvm/ADT/SmallVector.h"
-#include "llvm/Support/raw_ostream.h"
+#include "llvm/IR/Module.h"
namespace llvm {
+class MCJIT;
+
+// This is a helper class that the MCJIT execution engine uses for linking
+// functions across modules that it owns. It aggregates the memory manager
+// that is passed in to the MCJIT constructor and defers most functionality
+// to that object.
+class LinkingMemoryManager : public RTDyldMemoryManager {
+public:
+ LinkingMemoryManager(MCJIT *Parent, RTDyldMemoryManager *MM)
+ : ParentEngine(Parent), ClientMM(MM) {}
+
+ uint64_t getSymbolAddress(const std::string &Name) override;
+
+ // Functions deferred to client memory manager
+ uint8_t *allocateCodeSection(uintptr_t Size, unsigned Alignment,
+ unsigned SectionID,
+ StringRef SectionName) override {
+ return ClientMM->allocateCodeSection(Size, Alignment, SectionID, SectionName);
+ }
+
+ uint8_t *allocateDataSection(uintptr_t Size, unsigned Alignment,
+ unsigned SectionID, StringRef SectionName,
+ bool IsReadOnly) override {
+ return ClientMM->allocateDataSection(Size, Alignment,
+ SectionID, SectionName, IsReadOnly);
+ }
-// FIXME: This makes all kinds of horrible assumptions for the time being,
-// like only having one module, not needing to worry about multi-threading,
-// blah blah. Purely in get-it-up-and-limping mode for now.
+ void reserveAllocationSpace(uintptr_t CodeSize, uintptr_t DataSizeRO,
+ uintptr_t DataSizeRW) override {
+ return ClientMM->reserveAllocationSpace(CodeSize, DataSizeRO, DataSizeRW);
+ }
+
+ bool needsToReserveAllocationSpace() override {
+ return ClientMM->needsToReserveAllocationSpace();
+ }
+
+ void notifyObjectLoaded(ExecutionEngine *EE,
+ const ObjectImage *Obj) override {
+ ClientMM->notifyObjectLoaded(EE, Obj);
+ }
+
+ void registerEHFrames(uint8_t *Addr, uint64_t LoadAddr,
+ size_t Size) override {
+ ClientMM->registerEHFrames(Addr, LoadAddr, Size);
+ }
+
+ void deregisterEHFrames(uint8_t *Addr, uint64_t LoadAddr,
+ size_t Size) override {
+ ClientMM->deregisterEHFrames(Addr, LoadAddr, Size);
+ }
+
+ bool finalizeMemory(std::string *ErrMsg = nullptr) override {
+ return ClientMM->finalizeMemory(ErrMsg);
+ }
+
+private:
+ MCJIT *ParentEngine;
+ std::unique_ptr<RTDyldMemoryManager> ClientMM;
+};
+
+// About Module states: added->loaded->finalized.
+//
+// The purpose of the "added" state is having modules in standby. (added=known
+// but not compiled). The idea is that you can add a module to provide function
+// definitions but if nothing in that module is referenced by a module in which
+// a function is executed (note the wording here because it's not exactly the
+// ideal case) then the module never gets compiled. This is sort of lazy
+// compilation.
+//
+// The purpose of the "loaded" state (loaded=compiled and required sections
+// copied into local memory but not yet ready for execution) is to have an
+// intermediate state wherein clients can remap the addresses of sections, using
+// MCJIT::mapSectionAddress, (in preparation for later copying to a new location
+// or an external process) before relocations and page permissions are applied.
+//
+// It might not be obvious at first glance, but the "remote-mcjit" case in the
+// lli tool does this. In that case, the intermediate action is taken by the
+// RemoteMemoryManager in response to the notifyObjectLoaded function being
+// called.
class MCJIT : public ExecutionEngine {
- MCJIT(Module *M, TargetMachine *tm, TargetJITInfo &tji,
- RTDyldMemoryManager *MemMgr, CodeGenOpt::Level OptLevel,
+ MCJIT(Module *M, TargetMachine *tm, RTDyldMemoryManager *MemMgr,
bool AllocateGVsWithCode);
+ typedef llvm::SmallPtrSet<Module *, 4> ModulePtrSet;
+
+ class OwningModuleContainer {
+ public:
+ OwningModuleContainer() {
+ }
+ ~OwningModuleContainer() {
+ freeModulePtrSet(AddedModules);
+ freeModulePtrSet(LoadedModules);
+ freeModulePtrSet(FinalizedModules);
+ }
+
+ ModulePtrSet::iterator begin_added() { return AddedModules.begin(); }
+ ModulePtrSet::iterator end_added() { return AddedModules.end(); }
+
+ ModulePtrSet::iterator begin_loaded() { return LoadedModules.begin(); }
+ ModulePtrSet::iterator end_loaded() { return LoadedModules.end(); }
+
+ ModulePtrSet::iterator begin_finalized() { return FinalizedModules.begin(); }
+ ModulePtrSet::iterator end_finalized() { return FinalizedModules.end(); }
+
+ void addModule(Module *M) {
+ AddedModules.insert(M);
+ }
+
+ bool removeModule(Module *M) {
+ return AddedModules.erase(M) || LoadedModules.erase(M) ||
+ FinalizedModules.erase(M);
+ }
+
+ bool hasModuleBeenAddedButNotLoaded(Module *M) {
+ return AddedModules.count(M) != 0;
+ }
+
+ bool hasModuleBeenLoaded(Module *M) {
+ // If the module is in either the "loaded" or "finalized" sections it
+ // has been loaded.
+ return (LoadedModules.count(M) != 0 ) || (FinalizedModules.count(M) != 0);
+ }
+
+ bool hasModuleBeenFinalized(Module *M) {
+ return FinalizedModules.count(M) != 0;
+ }
+
+ bool ownsModule(Module* M) {
+ return (AddedModules.count(M) != 0) || (LoadedModules.count(M) != 0) ||
+ (FinalizedModules.count(M) != 0);
+ }
+
+ void markModuleAsLoaded(Module *M) {
+ // This checks against logic errors in the MCJIT implementation.
+ // This function should never be called with either a Module that MCJIT
+ // does not own or a Module that has already been loaded and/or finalized.
+ assert(AddedModules.count(M) &&
+ "markModuleAsLoaded: Module not found in AddedModules");
+
+ // Remove the module from the "Added" set.
+ AddedModules.erase(M);
+
+ // Add the Module to the "Loaded" set.
+ LoadedModules.insert(M);
+ }
+
+ void markModuleAsFinalized(Module *M) {
+ // This checks against logic errors in the MCJIT implementation.
+ // This function should never be called with either a Module that MCJIT
+ // does not own, a Module that has not been loaded or a Module that has
+ // already been finalized.
+ assert(LoadedModules.count(M) &&
+ "markModuleAsFinalized: Module not found in LoadedModules");
+
+ // Remove the module from the "Loaded" section of the list.
+ LoadedModules.erase(M);
+
+ // Add the Module to the "Finalized" section of the list by inserting it
+ // before the 'end' iterator.
+ FinalizedModules.insert(M);
+ }
+
+ void markAllLoadedModulesAsFinalized() {
+ for (ModulePtrSet::iterator I = LoadedModules.begin(),
+ E = LoadedModules.end();
+ I != E; ++I) {
+ Module *M = *I;
+ FinalizedModules.insert(M);
+ }
+ LoadedModules.clear();
+ }
+
+ private:
+ ModulePtrSet AddedModules;
+ ModulePtrSet LoadedModules;
+ ModulePtrSet FinalizedModules;
+
+ void freeModulePtrSet(ModulePtrSet& MPS) {
+ // Go through the module set and delete everything.
+ for (ModulePtrSet::iterator I = MPS.begin(), E = MPS.end(); I != E; ++I) {
+ Module *M = *I;
+ delete M;
+ }
+ MPS.clear();
+ }
+ };
+
TargetMachine *TM;
MCContext *Ctx;
- RTDyldMemoryManager *MemMgr;
+ LinkingMemoryManager MemMgr;
+ RuntimeDyld Dyld;
+ SmallVector<JITEventListener*, 2> EventListeners;
- // FIXME: These may need moved to a separate 'jitstate' member like the
- // non-MC JIT does for multithreading and such. Just keep them here for now.
- PassManager PM;
- Module *M;
- // FIXME: This really doesn't belong here.
- SmallVector<char, 4096> Buffer; // Working buffer into which we JIT.
- raw_svector_ostream OS;
+ OwningModuleContainer OwnedModules;
- RuntimeDyld Dyld;
+ SmallVector<object::Archive*, 2> Archives;
+
+ typedef SmallVector<ObjectImage *, 2> LoadedObjectList;
+ LoadedObjectList LoadedObjects;
+
+ // An optional ObjectCache to be notified of compiled objects and used to
+ // perform lookup of pre-compiled code to avoid re-compilation.
+ ObjectCache *ObjCache;
+
+ Function *FindFunctionNamedInModulePtrSet(const char *FnName,
+ ModulePtrSet::iterator I,
+ ModulePtrSet::iterator E);
+
+ void runStaticConstructorsDestructorsInModulePtrSet(bool isDtors,
+ ModulePtrSet::iterator I,
+ ModulePtrSet::iterator E);
public:
~MCJIT();
/// @name ExecutionEngine interface implementation
/// @{
+ void addModule(Module *M) override;
+ void addObjectFile(object::ObjectFile *O) override;
+ void addArchive(object::Archive *O) override;
+ bool removeModule(Module *M) override;
- virtual void *getPointerToBasicBlock(BasicBlock *BB);
+ /// FindFunctionNamed - Search all of the active modules to find the one that
+ /// defines FnName. This is very slow operation and shouldn't be used for
+ /// general code.
+ Function *FindFunctionNamed(const char *FnName) override;
- virtual void *getPointerToFunction(Function *F);
+ /// Sets the object manager that MCJIT should use to avoid compilation.
+ void setObjectCache(ObjectCache *manager) override;
- virtual void *recompileAndRelinkFunction(Function *F);
+ void setProcessAllSections(bool ProcessAllSections) override {
+ Dyld.setProcessAllSections(ProcessAllSections);
+ }
- virtual void freeMachineCodeForFunction(Function *F);
+ void generateCodeForModule(Module *M) override;
- virtual GenericValue runFunction(Function *F,
- const std::vector<GenericValue> &ArgValues);
+ /// finalizeObject - ensure the module is fully processed and is usable.
+ ///
+ /// It is the user-level function for completing the process of making the
+ /// object usable for execution. It should be called after sections within an
+ /// object have been relocated using mapSectionAddress. When this method is
+ /// called the MCJIT execution engine will reapply relocations for a loaded
+ /// object.
+ /// Is it OK to finalize a set of modules, add modules and finalize again.
+ // FIXME: Do we really need both of these?
+ void finalizeObject() override;
+ virtual void finalizeModule(Module *);
+ void finalizeLoadedModules();
+
+ /// runStaticConstructorsDestructors - This method is used to execute all of
+ /// the static constructors or destructors for a program.
+ ///
+ /// \param isDtors - Run the destructors instead of constructors.
+ void runStaticConstructorsDestructors(bool isDtors) override;
+
+ void *getPointerToBasicBlock(BasicBlock *BB) override;
+
+ void *getPointerToFunction(Function *F) override;
+
+ void *recompileAndRelinkFunction(Function *F) override;
+
+ void freeMachineCodeForFunction(Function *F) override;
+
+ GenericValue runFunction(Function *F,
+ const std::vector<GenericValue> &ArgValues) override;
/// getPointerToNamedFunction - This method returns the address of the
/// specified function by using the dlsym function call. As such it is only
/// it prints a message to stderr and aborts.
///
void *getPointerToNamedFunction(const std::string &Name,
- bool AbortOnFailure = true);
+ bool AbortOnFailure = true) override;
+
+ /// mapSectionAddress - map a section to its target address space value.
+ /// Map the address of a JIT section as returned from the memory manager
+ /// to the address in the target process as the running code will see it.
+ /// This is the address which will be used for relocation resolution.
+ void mapSectionAddress(const void *LocalAddress,
+ uint64_t TargetAddress) override {
+ Dyld.mapSectionAddress(LocalAddress, TargetAddress);
+ }
+ void RegisterJITEventListener(JITEventListener *L) override;
+ void UnregisterJITEventListener(JITEventListener *L) override;
+
+ // If successful, these function will implicitly finalize all loaded objects.
+ // To get a function address within MCJIT without causing a finalize, use
+ // getSymbolAddress.
+ uint64_t getGlobalValueAddress(const std::string &Name) override;
+ uint64_t getFunctionAddress(const std::string &Name) override;
+
+ TargetMachine *getTargetMachine() override { return TM; }
+
/// @}
/// @name (Private) Registration Interfaces
/// @{
static ExecutionEngine *createJIT(Module *M,
std::string *ErrorStr,
- JITMemoryManager *JMM,
- CodeGenOpt::Level OptLevel,
+ RTDyldMemoryManager *MemMgr,
bool GVsWithCode,
TargetMachine *TM);
// @}
+
+ // This is not directly exposed via the ExecutionEngine API, but it is
+ // used by the LinkingMemoryManager.
+ uint64_t getSymbolAddress(const std::string &Name,
+ bool CheckFunctionsOnly);
+
+protected:
+ /// emitObject -- Generate a JITed object in memory from the specified module
+ /// Currently, MCJIT only supports a single module and the module passed to
+ /// this function call is expected to be the contained module. The module
+ /// is passed as a parameter here to prepare for multiple module support in
+ /// the future.
+ ObjectBufferStream* emitObject(Module *M);
+
+ void NotifyObjectEmitted(const ObjectImage& Obj);
+ void NotifyFreeingObject(const ObjectImage& Obj);
+
+ uint64_t getExistingSymbolAddress(const std::string &Name);
+ Module *findModuleForSymbol(const std::string &Name,
+ bool CheckFunctionsOnly);
};
} // End llvm namespace
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