JIT.h revision 2c639add5f54ba0d0d59771e16d0582f6c59b8be
1//===-- JIT.h - Class definition for the JIT --------------------*- C++ -*-===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file was developed by the LLVM research group and is distributed under 6// the University of Illinois Open Source 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#include <map> 20 21namespace llvm { 22 23class Function; 24class GlobalValue; 25class Constant; 26class TargetMachine; 27class TargetJITInfo; 28class MachineCodeEmitter; 29 30class JITState { 31private: 32 FunctionPassManager PM; // Passes to compile a function 33 34 /// PendingGlobals - Global variables which have had memory allocated for them 35 /// while a function was code generated, but which have not been initialized 36 /// yet. 37 std::vector<const GlobalVariable*> PendingGlobals; 38 39public: 40 JITState(ModuleProvider *MP) : PM(MP) {} 41 42 FunctionPassManager& getPM(const MutexGuard& locked) { 43 return PM; 44 } 45 46 std::vector<const GlobalVariable*>& getPendingGlobals(const MutexGuard& locked) { 47 return PendingGlobals; 48 } 49}; 50 51 52class JIT : public ExecutionEngine { 53 TargetMachine &TM; // The current target we are compiling to 54 TargetJITInfo &TJI; // The JITInfo for the target we are compiling to 55 MachineCodeEmitter *MCE; // MCE object 56 57 JITState jitstate; 58 59 JIT(ModuleProvider *MP, TargetMachine &tm, TargetJITInfo &tji); 60public: 61 ~JIT(); 62 63 static void Register() { 64 JITCtor = create; 65 } 66 67 /// getJITInfo - Return the target JIT information structure. 68 /// 69 TargetJITInfo &getJITInfo() const { return TJI; } 70 71 /// create - Create an return a new JIT compiler if there is one available 72 /// for the current target. Otherwise, return null. 73 /// 74 static ExecutionEngine *create(ModuleProvider *MP, std::string* = 0); 75 76 /// run - Start execution with the specified function and arguments. 77 /// 78 virtual GenericValue runFunction(Function *F, 79 const std::vector<GenericValue> &ArgValues); 80 81 /// getPointerToNamedFunction - This method returns the address of the 82 /// specified function by using the dlsym function call. As such it is only 83 /// useful for resolving library symbols, not code generated symbols. 84 /// 85 void *getPointerToNamedFunction(const std::string &Name); 86 87 // CompilationCallback - Invoked the first time that a call site is found, 88 // which causes lazy compilation of the target function. 89 // 90 static void CompilationCallback(); 91 92 /// getPointerToFunction - This returns the address of the specified function, 93 /// compiling it if necessary. 94 /// 95 void *getPointerToFunction(Function *F); 96 97 /// getOrEmitGlobalVariable - Return the address of the specified global 98 /// variable, possibly emitting it to memory if needed. This is used by the 99 /// Emitter. 100 void *getOrEmitGlobalVariable(const GlobalVariable *GV); 101 102 /// getPointerToFunctionOrStub - If the specified function has been 103 /// code-gen'd, return a pointer to the function. If not, compile it, or use 104 /// a stub to implement lazy compilation if available. 105 /// 106 void *getPointerToFunctionOrStub(Function *F); 107 108 /// recompileAndRelinkFunction - This method is used to force a function 109 /// which has already been compiled, to be compiled again, possibly 110 /// after it has been modified. Then the entry to the old copy is overwritten 111 /// with a branch to the new copy. If there was no old copy, this acts 112 /// just like JIT::getPointerToFunction(). 113 /// 114 void *recompileAndRelinkFunction(Function *F); 115 116 /// freeMachineCodeForFunction - deallocate memory used to code-generate this 117 /// Function. 118 /// 119 void freeMachineCodeForFunction(Function *F); 120 121 /// getCodeEmitter - Return the code emitter this JIT is emitting into. 122 MachineCodeEmitter *getCodeEmitter() const { return MCE; } 123private: 124 static MachineCodeEmitter *createEmitter(JIT &J); 125 void runJITOnFunction (Function *F); 126}; 127 128} // End llvm namespace 129 130#endif 131