Import LLVM, at r72732.

1 files changed, 176 insertions, 0 deletions

diff --git a/lib/ExecutionEngine/JIT/JIT.h b/lib/ExecutionEngine/JIT/JIT.h
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+//===-- JIT.h - Class definition for the JIT --------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines the top-level JIT data structure.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef JIT_H
+#define JIT_H
+
+#include "llvm/ExecutionEngine/ExecutionEngine.h"
+#include "llvm/PassManager.h"
+
+namespace llvm {
+
+class Function;
+class TargetMachine;
+class TargetJITInfo;
+class MachineCodeEmitter;
+class MachineCodeInfo;
+
+class JITState {
+private:
+  FunctionPassManager PM;  // Passes to compile a function
+  ModuleProvider *MP;      // ModuleProvider used to create the PM
+
+  /// PendingFunctions - Functions which have not been code generated yet, but
+  /// were called from a function being code generated.
+  std::vector<Function*> PendingFunctions;
+
+public:
+  explicit JITState(ModuleProvider *MP) : PM(MP), MP(MP) {}
+
+  FunctionPassManager &getPM(const MutexGuard &L) {
+    return PM;
+  }
+  
+  ModuleProvider *getMP() const { return MP; }
+  std::vector<Function*> &getPendingFunctions(const MutexGuard &L) {
+    return PendingFunctions;
+  }
+};
+
+
+class JIT : public ExecutionEngine {
+  TargetMachine &TM;       // The current target we are compiling to
+  TargetJITInfo &TJI;      // The JITInfo for the target we are compiling to
+  JITCodeEmitter *JCE;     // JCE object
+
+  JITState *jitstate;
+
+  JIT(ModuleProvider *MP, TargetMachine &tm, TargetJITInfo &tji, 
+      JITMemoryManager *JMM, CodeGenOpt::Level OptLevel);
+public:
+  ~JIT();
+
+  static void Register() {
+    JITCtor = create;
+  }
+  
+  /// getJITInfo - Return the target JIT information structure.
+  ///
+  TargetJITInfo &getJITInfo() const { return TJI; }
+
+  /// create - Create an return a new JIT compiler if there is one available
+  /// for the current target.  Otherwise, return null.
+  ///
+  static ExecutionEngine *create(ModuleProvider *MP, std::string *Err,
+                                 CodeGenOpt::Level OptLevel =
+                                   CodeGenOpt::Default) {
+    return createJIT(MP, Err, 0, OptLevel);
+  }
+
+  virtual void addModuleProvider(ModuleProvider *MP);
+  
+  /// removeModuleProvider - Remove a ModuleProvider from the list of modules.
+  /// Relases the Module from the ModuleProvider, materializing it in the
+  /// process, and returns the materialized Module.
+  virtual Module *removeModuleProvider(ModuleProvider *MP,
+                                       std::string *ErrInfo = 0);
+
+  /// deleteModuleProvider - Remove a ModuleProvider from the list of modules,
+  /// and deletes the ModuleProvider and owned Module.  Avoids materializing 
+  /// the underlying module.
+  virtual void deleteModuleProvider(ModuleProvider *P,std::string *ErrInfo = 0);
+
+  /// runFunction - Start execution with the specified function and arguments.
+  ///
+  virtual GenericValue runFunction(Function *F,
+                                   const std::vector<GenericValue> &ArgValues);
+
+  /// getPointerToNamedFunction - This method returns the address of the
+  /// specified function by using the dlsym function call.  As such it is only
+  /// useful for resolving library symbols, not code generated symbols.
+  ///
+  /// If AbortOnFailure is false and no function with the given name is
+  /// found, this function silently returns a null pointer. Otherwise,
+  /// it prints a message to stderr and aborts.
+  ///
+  void *getPointerToNamedFunction(const std::string &Name,
+                                  bool AbortOnFailure = true);
+
+  // CompilationCallback - Invoked the first time that a call site is found,
+  // which causes lazy compilation of the target function.
+  //
+  static void CompilationCallback();
+
+  /// getPointerToFunction - This returns the address of the specified function,
+  /// compiling it if necessary.
+  ///
+  void *getPointerToFunction(Function *F);
+
+  /// getOrEmitGlobalVariable - Return the address of the specified global
+  /// variable, possibly emitting it to memory if needed.  This is used by the
+  /// Emitter.
+  void *getOrEmitGlobalVariable(const GlobalVariable *GV);
+
+  /// getPointerToFunctionOrStub - If the specified function has been
+  /// code-gen'd, return a pointer to the function.  If not, compile it, or use
+  /// a stub to implement lazy compilation if available.
+  ///
+  void *getPointerToFunctionOrStub(Function *F);
+
+  /// recompileAndRelinkFunction - This method is used to force a function
+  /// which has already been compiled, to be compiled again, possibly
+  /// after it has been modified. Then the entry to the old copy is overwritten
+  /// with a branch to the new copy. If there was no old copy, this acts
+  /// just like JIT::getPointerToFunction().
+  ///
+  void *recompileAndRelinkFunction(Function *F);
+
+  /// freeMachineCodeForFunction - deallocate memory used to code-generate this
+  /// Function.
+  ///
+  void freeMachineCodeForFunction(Function *F);
+
+  /// addPendingFunction - while jitting non-lazily, a called but non-codegen'd
+  /// function was encountered.  Add it to a pending list to be processed after 
+  /// the current function.
+  /// 
+  void addPendingFunction(Function *F);
+  
+  /// getCodeEmitter - Return the code emitter this JIT is emitting into.
+  JITCodeEmitter *getCodeEmitter() const { return JCE; }
+  
+  static ExecutionEngine *createJIT(ModuleProvider *MP, std::string *Err,
+                                    JITMemoryManager *JMM,
+                                    CodeGenOpt::Level OptLevel);
+
+
+  // Run the JIT on F and return information about the generated code
+  void runJITOnFunction(Function *F, MachineCodeInfo *MCI = 0);
+
+private:
+  static JITCodeEmitter *createEmitter(JIT &J, JITMemoryManager *JMM);
+  void registerMachineCodeInfo(MachineCodeInfo *MCI);
+  void runJITOnFunctionUnlocked(Function *F, const MutexGuard &locked);
+  void updateFunctionStub(Function *F);
+  void updateDlsymStubTable();
+
+protected:
+
+  /// getMemoryforGV - Allocate memory for a global variable.
+  virtual char* getMemoryForGV(const GlobalVariable* GV);
+
+};
+
+} // End llvm namespace
+
+#endif