1 //===-- MCJIT.h - Class definition for the MCJIT ----------------*- 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 #ifndef LLVM_LIB_EXECUTIONENGINE_MCJIT_H 11 #define LLVM_LIB_EXECUTIONENGINE_MCJIT_H 12 13 #include "llvm/PassManager.h" 14 #include "llvm/ExecutionEngine/ExecutionEngine.h" 15 #include "llvm/ExecutionEngine/RuntimeDyld.h" 16 #include "llvm/ADT/SmallVector.h" 17 #include "llvm/Support/raw_ostream.h" 18 19 namespace llvm { 20 21 // FIXME: This makes all kinds of horrible assumptions for the time being, 22 // like only having one module, not needing to worry about multi-threading, 23 // blah blah. Purely in get-it-up-and-limping mode for now. 24 25 class MCJIT : public ExecutionEngine { 26 MCJIT(Module *M, TargetMachine *tm, RTDyldMemoryManager *MemMgr, 27 bool AllocateGVsWithCode); 28 29 TargetMachine *TM; 30 MCContext *Ctx; 31 RTDyldMemoryManager *MemMgr; 32 RuntimeDyld Dyld; 33 34 // FIXME: Add support for multiple modules 35 bool isCompiled; 36 Module *M; 37 38 // FIXME: Move these to a single container which manages JITed objects 39 SmallVector<char, 4096> Buffer; // Working buffer into which we JIT. 40 raw_svector_ostream OS; 41 42 public: 43 ~MCJIT(); 44 45 /// @name ExecutionEngine interface implementation 46 /// @{ 47 48 virtual void *getPointerToBasicBlock(BasicBlock *BB); 49 50 virtual void *getPointerToFunction(Function *F); 51 52 virtual void *recompileAndRelinkFunction(Function *F); 53 54 virtual void freeMachineCodeForFunction(Function *F); 55 56 virtual GenericValue runFunction(Function *F, 57 const std::vector<GenericValue> &ArgValues); 58 59 /// getPointerToNamedFunction - This method returns the address of the 60 /// specified function by using the dlsym function call. As such it is only 61 /// useful for resolving library symbols, not code generated symbols. 62 /// 63 /// If AbortOnFailure is false and no function with the given name is 64 /// found, this function silently returns a null pointer. Otherwise, 65 /// it prints a message to stderr and aborts. 66 /// 67 virtual void *getPointerToNamedFunction(const std::string &Name, 68 bool AbortOnFailure = true); 69 70 /// mapSectionAddress - map a section to its target address space value. 71 /// Map the address of a JIT section as returned from the memory manager 72 /// to the address in the target process as the running code will see it. 73 /// This is the address which will be used for relocation resolution. 74 virtual void mapSectionAddress(void *LocalAddress, uint64_t TargetAddress) { 75 Dyld.mapSectionAddress(LocalAddress, TargetAddress); 76 } 77 78 /// @} 79 /// @name (Private) Registration Interfaces 80 /// @{ 81 82 static void Register() { 83 MCJITCtor = createJIT; 84 } 85 86 static ExecutionEngine *createJIT(Module *M, 87 std::string *ErrorStr, 88 JITMemoryManager *JMM, 89 bool GVsWithCode, 90 TargetMachine *TM); 91 92 // @} 93 94 protected: 95 /// emitObject -- Generate a JITed object in memory from the specified module 96 /// Currently, MCJIT only supports a single module and the module passed to 97 /// this function call is expected to be the contained module. The module 98 /// is passed as a parameter here to prepare for multiple module support in 99 /// the future. 100 void emitObject(Module *M); 101 }; 102 103 } // End llvm namespace 104 105 #endif 106
