lib/ExecutionEngine/JIT/JIT.h

   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 #include "llvm/Support/ValueHandle.h"
  20
  21 namespace llvm {
  22
  23 class Function;
  24 struct JITEvent_EmittedFunctionDetails;
  25 class MachineCodeEmitter;
  26 class MachineCodeInfo;
  27 class TargetJITInfo;
  28 class TargetMachine;
  29
  30 class JITState {
  31 private:
  32   FunctionPassManager PM;  // Passes to compile a function
  33   Module *M;               // Module used to create the PM
  34
  35   /// PendingFunctions - Functions which have not been code generated yet, but
  36   /// were called from a function being code generated.
  37   std::vector<AssertingVH<Function> > PendingFunctions;
  38
  39 public:
  40   explicit JITState(Module *M) : PM(M), M(M) {}
  41
  42   FunctionPassManager &getPM(const MutexGuard &L) {
  43     return PM;
  44   }
  45
  46   Module *getModule() const { return M; }
  47   std::vector<AssertingVH<Function> > &getPendingFunctions(const MutexGuard &L){
  48     return PendingFunctions;
  49   }
  50 };
  51
  52
  53 class JIT : public ExecutionEngine {
  54   /// types
  55   typedef ValueMap<const BasicBlock *, void *>
  56       BasicBlockAddressMapTy;
  57   /// data
  58   TargetMachine &TM;       // The current target we are compiling to
  59   TargetJITInfo &TJI;      // The JITInfo for the target we are compiling to
  60   JITCodeEmitter *JCE;     // JCE object
  61   std::vector<JITEventListener*> EventListeners;
  62
  63   /// AllocateGVsWithCode - Some applications require that global variables and
  64   /// code be allocated into the same region of memory, in which case this flag
  65   /// should be set to true.  Doing so breaks freeMachineCodeForFunction.
  66   bool AllocateGVsWithCode;
  67
  68   /// True while the JIT is generating code.  Used to assert against recursive
  69   /// entry.
  70   bool isAlreadyCodeGenerating;
  71
  72   JITState *jitstate;
  73
  74   /// BasicBlockAddressMap - A mapping between LLVM basic blocks and their
  75   /// actualized version, only filled for basic blocks that have their address
  76   /// taken.
  77   BasicBlockAddressMapTy BasicBlockAddressMap;
  78
  79
  80   JIT(Module *M, TargetMachine &tm, TargetJITInfo &tji,
  81       JITMemoryManager *JMM, CodeGenOpt::Level OptLevel,
  82       bool AllocateGVsWithCode);
  83 public:
  84   ~JIT();
  85
  86   static void Register() {
  87     JITCtor = createJIT;
  88   }
  89
  90   /// getJITInfo - Return the target JIT information structure.
  91   ///
  92   TargetJITInfo &getJITInfo() const { return TJI; }
  93
  94   /// create - Create an return a new JIT compiler if there is one available
  95   /// for the current target.  Otherwise, return null.
  96   ///
  97   static ExecutionEngine *create(Module *M,
  98                                  std::string *Err,
  99                                  JITMemoryManager *JMM,
 100                                  CodeGenOpt::Level OptLevel =
 101                                    CodeGenOpt::Default,
 102                                  bool GVsWithCode = true,
 103                                  CodeModel::Model CMM = CodeModel::Default) {
 104     return ExecutionEngine::createJIT(M, Err, JMM, OptLevel, GVsWithCode,
 105                                       CMM);
 106   }
 107
 108   virtual void addModule(Module *M);
 109
 110   /// removeModule - Remove a Module from the list of modules.  Returns true if
 111   /// M is found.
 112   virtual bool removeModule(Module *M);
 113
 114   /// runFunction - Start execution with the specified function and arguments.
 115   ///
 116   virtual GenericValue runFunction(Function *F,
 117                                    const std::vector<GenericValue> &ArgValues);
 118
 119   /// getPointerToNamedFunction - This method returns the address of the
 120   /// specified function by using the dlsym function call.  As such it is only
 121   /// useful for resolving library symbols, not code generated symbols.
 122   ///
 123   /// If AbortOnFailure is false and no function with the given name is
 124   /// found, this function silently returns a null pointer. Otherwise,
 125   /// it prints a message to stderr and aborts.
 126   ///
 127   void *getPointerToNamedFunction(const std::string &Name,
 128                                   bool AbortOnFailure = true);
 129
 130   // CompilationCallback - Invoked the first time that a call site is found,
 131   // which causes lazy compilation of the target function.
 132   //
 133   static void CompilationCallback();
 134
 135   /// getPointerToFunction - This returns the address of the specified function,
 136   /// compiling it if necessary.
 137   ///
 138   void *getPointerToFunction(Function *F);
 139
 140   /// addPointerToBasicBlock - Adds address of the specific basic block.
 141   void addPointerToBasicBlock(const BasicBlock *BB, void *Addr);
 142
 143   /// clearPointerToBasicBlock - Removes address of specific basic block.
 144   void clearPointerToBasicBlock(const BasicBlock *BB);
 145
 146   /// getPointerToBasicBlock - This returns the address of the specified basic
 147   /// block, assuming function is compiled.
 148   void *getPointerToBasicBlock(BasicBlock *BB);
 149
 150   /// getOrEmitGlobalVariable - Return the address of the specified global
 151   /// variable, possibly emitting it to memory if needed.  This is used by the
 152   /// Emitter.
 153   void *getOrEmitGlobalVariable(const GlobalVariable *GV);
 154
 155   /// getPointerToFunctionOrStub - If the specified function has been
 156   /// code-gen'd, return a pointer to the function.  If not, compile it, or use
 157   /// a stub to implement lazy compilation if available.
 158   ///
 159   void *getPointerToFunctionOrStub(Function *F);
 160
 161   /// recompileAndRelinkFunction - This method is used to force a function
 162   /// which has already been compiled, to be compiled again, possibly
 163   /// after it has been modified. Then the entry to the old copy is overwritten
 164   /// with a branch to the new copy. If there was no old copy, this acts
 165   /// just like JIT::getPointerToFunction().
 166   ///
 167   void *recompileAndRelinkFunction(Function *F);
 168
 169   /// freeMachineCodeForFunction - deallocate memory used to code-generate this
 170   /// Function.
 171   ///
 172   void freeMachineCodeForFunction(Function *F);
 173
 174   /// addPendingFunction - while jitting non-lazily, a called but non-codegen'd
 175   /// function was encountered.  Add it to a pending list to be processed after
 176   /// the current function.
 177   ///
 178   void addPendingFunction(Function *F);
 179
 180   /// getCodeEmitter - Return the code emitter this JIT is emitting into.
 181   ///
 182   JITCodeEmitter *getCodeEmitter() const { return JCE; }
 183
 184   static ExecutionEngine *createJIT(Module *M,
 185                                     std::string *ErrorStr,
 186                                     JITMemoryManager *JMM,
 187                                     CodeGenOpt::Level OptLevel,
 188                                     bool GVsWithCode,
 189                                     TargetMachine *TM);
 190
 191   // Run the JIT on F and return information about the generated code
 192   void runJITOnFunction(Function *F, MachineCodeInfo *MCI = 0);
 193
 194   virtual void RegisterJITEventListener(JITEventListener *L);
 195   virtual void UnregisterJITEventListener(JITEventListener *L);
 196   /// These functions correspond to the methods on JITEventListener.  They
 197   /// iterate over the registered listeners and call the corresponding method on
 198   /// each.
 199   void NotifyFunctionEmitted(
 200       const Function &F, void *Code, size_t Size,
 201       const JITEvent_EmittedFunctionDetails &Details);
 202   void NotifyFreeingMachineCode(void *OldPtr);
 203
 204   BasicBlockAddressMapTy &
 205   getBasicBlockAddressMap(const MutexGuard &) {
 206     return BasicBlockAddressMap;
 207   }
 208
 209
 210 private:
 211   static JITCodeEmitter *createEmitter(JIT &J, JITMemoryManager *JMM,
 212                                        TargetMachine &tm);
 213   void runJITOnFunctionUnlocked(Function *F, const MutexGuard &locked);
 214   void updateFunctionStub(Function *F);
 215   void jitTheFunction(Function *F, const MutexGuard &locked);
 216
 217 protected:
 218
 219   /// getMemoryforGV - Allocate memory for a global variable.
 220   virtual char* getMemoryForGV(const GlobalVariable* GV);
 221
 222 };
 223
 224 } // End llvm namespace
 225
 226 #endif