<commit_before>//===- ExecutionEngine.h - Abstract Execution Engine Interface --*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file was developed by the LLVM research group and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines the abstract interface that implements execution support
// for LLVM.
//
//===----------------------------------------------------------------------===//

#ifndef EXECUTION_ENGINE_H
#define EXECUTION_ENGINE_H

#include <vector>
#include <map>
#include <cassert>
#include <string>
#include "llvm/Support/MutexGuard.h"

namespace llvm {

union GenericValue;
class Constant;
class Function;
class GlobalVariable;
class GlobalValue;
class Module;
class ModuleProvider;
class TargetData;
class Type;

class ExecutionEngineState {
private:
  /// GlobalAddressMap - A mapping between LLVM global values and their
  /// actualized version...
  std::map<const GlobalValue*, void *> GlobalAddressMap;

  /// GlobalAddressReverseMap - This is the reverse mapping of GlobalAddressMap,
  /// used to convert raw addresses into the LLVM global value that is emitted
  /// at the address.  This map is not computed unless getGlobalValueAtAddress
  /// is called at some point.
  std::map<void *, const GlobalValue*> GlobalAddressReverseMap;

public:
  std::map<const GlobalValue*, void *> &
  getGlobalAddressMap(const MutexGuard &locked) {
    return GlobalAddressMap;
  }

  std::map<void*, const GlobalValue*> & 
  getGlobalAddressReverseMap(const MutexGuard& locked) {
    return GlobalAddressReverseMap;
  }
};


class ExecutionEngine {
  Module &CurMod;
  const TargetData *TD;

  ExecutionEngineState state;

protected:
  ModuleProvider *MP;

  void setTargetData(const TargetData *td) {
    TD = td;
  }

  // To avoid having libexecutionengine depend on the JIT and interpreter
  // libraries, the JIT and Interpreter set these functions to ctor pointers
  // at startup time if they are linked in.
  typedef ExecutionEngine *(*EECtorFn)(ModuleProvider*);
  static EECtorFn JITCtor, InterpCtor;
    
public:
  /// lock - This lock is protects the ExecutionEngine, JIT, JITResolver and
  /// JITEmitter classes.  It must be held while changing the internal state of
  /// any of those classes.
  sys::Mutex lock; // Used to make this class and subclasses thread-safe

  ExecutionEngine(ModuleProvider *P);
  ExecutionEngine(Module *M);
  virtual ~ExecutionEngine();

  Module &getModule() const { return CurMod; }
  const TargetData *getTargetData() const { return TD; }

  /// create - This is the factory method for creating an execution engine which
  /// is appropriate for the current machine.
  static ExecutionEngine *create(ModuleProvider *MP,
                                 bool ForceInterpreter = false);

  /// runFunction - Execute the specified function with the specified arguments,
  /// and return the result.
  ///
  virtual GenericValue runFunction(Function *F,
                                const std::vector<GenericValue> &ArgValues) = 0;

  /// runStaticConstructorsDestructors - This method is used to execute all of
  /// the static constructors or destructors for a module, depending on the
  /// value of isDtors.
  void runStaticConstructorsDestructors(bool isDtors);
  
  
  /// runFunctionAsMain - This is a helper function which wraps runFunction to
  /// handle the common task of starting up main with the specified argc, argv,
  /// and envp parameters.
  int runFunctionAsMain(Function *Fn, const std::vector<std::string> &argv,
                        const char * const * envp);


  void addGlobalMapping(const GlobalValue *GV, void *Addr) {
    MutexGuard locked(lock);

    void *&CurVal = state.getGlobalAddressMap(locked)[GV];
    assert((CurVal == 0 || Addr == 0) && "GlobalMapping already established!");
    CurVal = Addr;

    // If we are using the reverse mapping, add it too
    if (!state.getGlobalAddressReverseMap(locked).empty()) {
      const GlobalValue *&V = state.getGlobalAddressReverseMap(locked)[Addr];
      assert((V == 0 || GV == 0) && "GlobalMapping already established!");
      V = GV;
    }
  }

  /// clearAllGlobalMappings - Clear all global mappings and start over again
  /// use in dynamic compilation scenarios when you want to move globals
  void clearAllGlobalMappings() {
    MutexGuard locked(lock);

    state.getGlobalAddressMap(locked).clear();
    state.getGlobalAddressReverseMap(locked).clear();
  }

  /// updateGlobalMapping - Replace an existing mapping for GV with a new
  /// address.  This updates both maps as required.
  void updateGlobalMapping(const GlobalValue *GV, void *Addr) {
    MutexGuard locked(lock);

    void *&CurVal = state.getGlobalAddressMap(locked)[GV];
    if (CurVal && !state.getGlobalAddressReverseMap(locked).empty())
      state.getGlobalAddressReverseMap(locked).erase(CurVal);
    CurVal = Addr;

    // If we are using the reverse mapping, add it too
    if (!state.getGlobalAddressReverseMap(locked).empty()) {
      const GlobalValue *&V = state.getGlobalAddressReverseMap(locked)[Addr];
      assert((V == 0 || GV == 0) && "GlobalMapping already established!");
      V = GV;
    }
  }

  /// getPointerToGlobalIfAvailable - This returns the address of the specified
  /// global value if it is available, otherwise it returns null.
  ///
  void *getPointerToGlobalIfAvailable(const GlobalValue *GV) {
    MutexGuard locked(lock);

    std::map<const GlobalValue*, void*>::iterator I =
      state.getGlobalAddressMap(locked).find(GV);
    return I != state.getGlobalAddressMap(locked).end() ? I->second : 0;
  }

  /// getPointerToGlobal - This returns the address of the specified global
  /// value.  This may involve code generation if it's a function.
  ///<commit_msg>Move methods out of line so that MutexGuard.h isn't required in the header.<commit_after>//===- ExecutionEngine.h - Abstract Execution Engine Interface --*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file was developed by the LLVM research group and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines the abstract interface that implements execution support
// for LLVM.
//
//===----------------------------------------------------------------------===//

#ifndef EXECUTION_ENGINE_H
#define EXECUTION_ENGINE_H

#include <vector>
#include <map>
#include <cassert>
#include <string>
#include "llvm/System/Mutex.h"

namespace llvm {

union GenericValue;
class Constant;
class Function;
class GlobalVariable;
class GlobalValue;
class Module;
class ModuleProvider;
class TargetData;
class Type;
class MutexGuard;

class ExecutionEngineState {
private:
  /// GlobalAddressMap - A mapping between LLVM global values and their
  /// actualized version...
  std::map<const GlobalValue*, void *> GlobalAddressMap;

  /// GlobalAddressReverseMap - This is the reverse mapping of GlobalAddressMap,
  /// used to convert raw addresses into the LLVM global value that is emitted
  /// at the address.  This map is not computed unless getGlobalValueAtAddress
  /// is called at some point.
  std::map<void *, const GlobalValue*> GlobalAddressReverseMap;

public:
  std::map<const GlobalValue*, void *> &
  getGlobalAddressMap(const MutexGuard &locked) {
    return GlobalAddressMap;
  }

  std::map<void*, const GlobalValue*> & 
  getGlobalAddressReverseMap(const MutexGuard& locked) {
    return GlobalAddressReverseMap;
  }
};


class ExecutionEngine {
  Module &CurMod;
  const TargetData *TD;

  ExecutionEngineState state;

protected:
  ModuleProvider *MP;

  void setTargetData(const TargetData *td) {
    TD = td;
  }

  // To avoid having libexecutionengine depend on the JIT and interpreter
  // libraries, the JIT and Interpreter set these functions to ctor pointers
  // at startup time if they are linked in.
  typedef ExecutionEngine *(*EECtorFn)(ModuleProvider*);
  static EECtorFn JITCtor, InterpCtor;
    
public:
  /// lock - This lock is protects the ExecutionEngine, JIT, JITResolver and
  /// JITEmitter classes.  It must be held while changing the internal state of
  /// any of those classes.
  sys::Mutex lock; // Used to make this class and subclasses thread-safe

  ExecutionEngine(ModuleProvider *P);
  ExecutionEngine(Module *M);
  virtual ~ExecutionEngine();

  Module &getModule() const { return CurMod; }
  const TargetData *getTargetData() const { return TD; }

  /// create - This is the factory method for creating an execution engine which
  /// is appropriate for the current machine.
  static ExecutionEngine *create(ModuleProvider *MP,
                                 bool ForceInterpreter = false);

  /// runFunction - Execute the specified function with the specified arguments,
  /// and return the result.
  ///
  virtual GenericValue runFunction(Function *F,
                                const std::vector<GenericValue> &ArgValues) = 0;

  /// runStaticConstructorsDestructors - This method is used to execute all of
  /// the static constructors or destructors for a module, depending on the
  /// value of isDtors.
  void runStaticConstructorsDestructors(bool isDtors);
  
  
  /// runFunctionAsMain - This is a helper function which wraps runFunction to
  /// handle the common task of starting up main with the specified argc, argv,
  /// and envp parameters.
  int runFunctionAsMain(Function *Fn, const std::vector<std::string> &argv,
                        const char * const * envp);


  /// addGlobalMapping - Tell the execution engine that the specified global is
  /// at the specified location.  This is used internally as functions are JIT'd
  /// and as global variables are laid out in memory.  It can and should also be
  /// used by clients of the EE that want to have an LLVM global overlay
  /// existing data in memory.
  void addGlobalMapping(const GlobalValue *GV, void *Addr);
  
  /// clearAllGlobalMappings - Clear all global mappings and start over again
  /// use in dynamic compilation scenarios when you want to move globals
  void clearAllGlobalMappings();
  
  /// updateGlobalMapping - Replace an existing mapping for GV with a new
  /// address.  This updates both maps as required.  If "Addr" is null, the
  /// entry for the global is removed from the mappings.
  void updateGlobalMapping(const GlobalValue *GV, void *Addr);
  
  /// getPointerToGlobalIfAvailable - This returns the address of the specified
  /// global value if it is has already been codegen'd, otherwise it returns
  /// null.
  ///
  void *getPointerToGlobalIfAvailable(const GlobalValue *GV);

  /// getPointerToGlobal - This returns the address of the specified global
  /// value.  This may involve code generation if it's a function.
  ///
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