<commit_before>//===-- llvm/ModuleProvider.h - Interface for module providers --*- 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 provides an abstract interface for loading a module from some
// place.  This interface allows incremental or random access loading of
// functions from the file.  This is useful for applications like JIT compilers
// or interprocedural optimizers that do not need the entire program in memory
// at the same time.
//
//===----------------------------------------------------------------------===//

#ifndef MODULEPROVIDER_H
#define MODULEPROVIDER_H

namespace llvm {

class Function;
class Module;

class ModuleProvider {
protected:
  Module *TheModule;
  ModuleProvider();

public:
  virtual ~ModuleProvider();

  /// getModule - returns the module this provider is encapsulating.
  ///
  Module* getModule() { return TheModule; }

  /// materializeFunction - make sure the given function is fully read.
  ///
  virtual void materializeFunction(Function *F) = 0;

  /// materializeModule - make sure the entire Module has been completely read.
  ///
  Module* materializeModule();

  /// releaseModule - no longer delete the Module* when provider is destroyed.
  ///
  virtual Module* releaseModule() { 
    // Since we're losing control of this Module, we must hand it back complete
    materializeModule();
    Module *tempM = TheModule; 
    TheModule = 0; 
    return tempM; 
  }
};


/// ExistingModuleProvider - Allow conversion from a fully materialized Module
/// into a ModuleProvider, allowing code that expects a ModuleProvider to work
/// if we just have a Module.  Note that the ModuleProvider takes ownership of
/// the Module specified.
struct ExistingModuleProvider : public ModuleProvider {
  ExistingModuleProvider(Module *M) {
    TheModule = M;
  }
  void materializeFunction(Function *F) {}
};

} // End llvm namespace

#endif<commit_msg>To materialize a module, you need to know what functions NEED to be read and which ones don't, which is state that the parent class doesn't know without knowing the implementation. Let the children classes implement materializeModule().<commit_after>//===-- llvm/ModuleProvider.h - Interface for module providers --*- 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 provides an abstract interface for loading a module from some
// place.  This interface allows incremental or random access loading of
// functions from the file.  This is useful for applications like JIT compilers
// or interprocedural optimizers that do not need the entire program in memory
// at the same time.
//
//===----------------------------------------------------------------------===//

#ifndef MODULEPROVIDER_H
#define MODULEPROVIDER_H

namespace llvm {

class Function;
class Module;

class ModuleProvider {
protected:
  Module *TheModule;
  ModuleProvider();

public:
  virtual ~ModuleProvider();

  /// getModule - returns the module this provider is encapsulating.
  ///
  Module* getModule() { return TheModule; }

  /// materializeFunction - make sure the given function is fully read.
  ///
  virtual void materializeFunction(Function *F) = 0;

  /// materializeModule - make sure the entire Module has been completely read.
  ///
  virtual Module* materializeModule() = 0;

  /// releaseModule - no longer delete the Module* when provider is destroyed.
  ///
  virtual Module* releaseModule() { 
    // Since we're losing control of this Module, we must hand it back complete
    materializeModule();
    Module *tempM = TheModule; 
    TheModule = 0; 
    return tempM; 
  }
};


/// ExistingModuleProvider - Allow conversion from a fully materialized Module
/// into a ModuleProvider, allowing code that expects a ModuleProvider to work
/// if we just have a Module.  Note that the ModuleProvider takes ownership of
/// the Module specified.
struct ExistingModuleProvider : public ModuleProvider {
  ExistingModuleProvider(Module *M) {
    TheModule = M;
  }
  void materializeFunction(Function *F) {}
  Module* materializeModule() { return TheModule; }
};

} // End llvm namespace

#endif
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