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 19namespace 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 25class 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 42public: 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(const void *LocalAddress, 75 uint64_t TargetAddress) { 76 Dyld.mapSectionAddress(LocalAddress, TargetAddress); 77 } 78 79 /// @} 80 /// @name (Private) Registration Interfaces 81 /// @{ 82 83 static void Register() { 84 MCJITCtor = createJIT; 85 } 86 87 static ExecutionEngine *createJIT(Module *M, 88 std::string *ErrorStr, 89 JITMemoryManager *JMM, 90 bool GVsWithCode, 91 TargetMachine *TM); 92 93 // @} 94 95protected: 96 /// emitObject -- Generate a JITed object in memory from the specified module 97 /// Currently, MCJIT only supports a single module and the module passed to 98 /// this function call is expected to be the contained module. The module 99 /// is passed as a parameter here to prepare for multiple module support in 100 /// the future. 101 void emitObject(Module *M); 102}; 103 104} // End llvm namespace 105 106#endif 107