JIT.h revision d6b7a242d345fd79a337afd384bb586c5619cfe7
1//===-- JIT.h - Class definition for the JIT --------------------*- 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// This file defines the top-level JIT data structure. 11// 12//===----------------------------------------------------------------------===// 13 14#ifndef JIT_H 15#define JIT_H 16 17#include "llvm/ExecutionEngine/ExecutionEngine.h" 18#include "llvm/PassManager.h" 19 20namespace llvm { 21 22class Function; 23class TargetMachine; 24class TargetJITInfo; 25class MachineCodeEmitter; 26 27class JITState { 28private: 29 FunctionPassManager PM; // Passes to compile a function 30 ModuleProvider *MP; // ModuleProvider used to create the PM 31 32 /// PendingFunctions - Functions which have not been code generated yet, but 33 /// were called from a function being code generated. 34 std::vector<Function*> PendingFunctions; 35 36public: 37 explicit JITState(ModuleProvider *MP) : PM(MP), MP(MP) {} 38 39 FunctionPassManager &getPM(const MutexGuard &L) { 40 return PM; 41 } 42 43 ModuleProvider *getMP() const { return MP; } 44 std::vector<Function*> &getPendingFunctions(const MutexGuard &L) { 45 return PendingFunctions; 46 } 47}; 48 49 50class JIT : public ExecutionEngine { 51 TargetMachine &TM; // The current target we are compiling to 52 TargetJITInfo &TJI; // The JITInfo for the target we are compiling to 53 MachineCodeEmitter *MCE; // MCE object 54 55 JITState *jitstate; 56 57 JIT(ModuleProvider *MP, TargetMachine &tm, TargetJITInfo &tji, 58 JITMemoryManager *JMM, bool Fast); 59public: 60 ~JIT(); 61 62 static void Register() { 63 JITCtor = create; 64 } 65 66 /// getJITInfo - Return the target JIT information structure. 67 /// 68 TargetJITInfo &getJITInfo() const { return TJI; } 69 70 /// create - Create an return a new JIT compiler if there is one available 71 /// for the current target. Otherwise, return null. 72 /// 73 static ExecutionEngine *create(ModuleProvider *MP, std::string *Err, 74 bool Fast = false) { 75 return createJIT(MP, Err, 0, Fast); 76 } 77 78 virtual void addModuleProvider(ModuleProvider *MP); 79 80 /// removeModuleProvider - Remove a ModuleProvider from the list of modules. 81 /// Relases the Module from the ModuleProvider, materializing it in the 82 /// process, and returns the materialized Module. 83 virtual Module *removeModuleProvider(ModuleProvider *MP, 84 std::string *ErrInfo = 0); 85 86 /// deleteModuleProvider - Remove a ModuleProvider from the list of modules, 87 /// and deletes the ModuleProvider and owned Module. Avoids materializing 88 /// the underlying module. 89 virtual void deleteModuleProvider(ModuleProvider *P,std::string *ErrInfo = 0); 90 91 /// runFunction - Start execution with the specified function and arguments. 92 /// 93 virtual GenericValue runFunction(Function *F, 94 const std::vector<GenericValue> &ArgValues); 95 96 /// getPointerToNamedFunction - This method returns the address of the 97 /// specified function by using the dlsym function call. As such it is only 98 /// useful for resolving library symbols, not code generated symbols. 99 /// 100 /// If AbortOnFailure is false and no function with the given name is 101 /// found, this function silently returns a null pointer. Otherwise, 102 /// it prints a message to stderr and aborts. 103 /// 104 void *getPointerToNamedFunction(const std::string &Name, 105 bool AbortOnFailure = true); 106 107 // CompilationCallback - Invoked the first time that a call site is found, 108 // which causes lazy compilation of the target function. 109 // 110 static void CompilationCallback(); 111 112 /// getPointerToFunction - This returns the address of the specified function, 113 /// compiling it if necessary. 114 /// 115 void *getPointerToFunction(Function *F); 116 117 /// getOrEmitGlobalVariable - Return the address of the specified global 118 /// variable, possibly emitting it to memory if needed. This is used by the 119 /// Emitter. 120 void *getOrEmitGlobalVariable(const GlobalVariable *GV); 121 122 /// getPointerToFunctionOrStub - If the specified function has been 123 /// code-gen'd, return a pointer to the function. If not, compile it, or use 124 /// a stub to implement lazy compilation if available. 125 /// 126 void *getPointerToFunctionOrStub(Function *F); 127 128 /// recompileAndRelinkFunction - This method is used to force a function 129 /// which has already been compiled, to be compiled again, possibly 130 /// after it has been modified. Then the entry to the old copy is overwritten 131 /// with a branch to the new copy. If there was no old copy, this acts 132 /// just like JIT::getPointerToFunction(). 133 /// 134 void *recompileAndRelinkFunction(Function *F); 135 136 /// freeMachineCodeForFunction - deallocate memory used to code-generate this 137 /// Function. 138 /// 139 void freeMachineCodeForFunction(Function *F); 140 141 /// addPendingFunction - while jitting non-lazily, a called but non-codegen'd 142 /// function was encountered. Add it to a pending list to be processed after 143 /// the current function. 144 /// 145 void addPendingFunction(Function *F); 146 147 /// getCodeEmitter - Return the code emitter this JIT is emitting into. 148 MachineCodeEmitter *getCodeEmitter() const { return MCE; } 149 150 static ExecutionEngine *createJIT(ModuleProvider *MP, std::string *Err, 151 JITMemoryManager *JMM, bool Fast); 152 153private: 154 static MachineCodeEmitter *createEmitter(JIT &J, JITMemoryManager *JMM); 155 void runJITOnFunction(Function *F); 156 void runJITOnFunctionUnlocked(Function *F, const MutexGuard &locked); 157 void updateFunctionStub(Function *F); 158 void updateDlsymStubTable(); 159 160protected: 161 162 /// getMemoryforGV - Allocate memory for a global variable. 163 virtual char* getMemoryForGV(const GlobalVariable* GV); 164 165}; 166 167} // End llvm namespace 168 169#endif 170