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//===-- 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
#include <string>
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. If the
/// module is corrupt, this returns true and fills in the optional string
/// with information about the problem. If successful, this returns false.
///
virtual bool materializeFunction(Function *F, std::string *ErrInfo = 0) = 0;
/// dematerializeFunction - If the given function is read in, and if the
/// module provider supports it, release the memory for the function, and set
/// it up to be materialized lazily. If the provider doesn't support this
/// capability, this method is a noop.
///
virtual void dematerializeFunction(Function *F) {}
/// materializeModule - make sure the entire Module has been completely read.
/// On error, return null and fill in the error string if specified.
///
virtual Module* materializeModule(std::string *ErrInfo = 0) = 0;
/// releaseModule - no longer delete the Module* when provider is destroyed.
/// On error, return null and fill in the error string if specified.
///
virtual Module* releaseModule(std::string *ErrInfo = 0) {
// Since we're losing control of this Module, we must hand it back complete
if (!materializeModule(ErrInfo))
return 0;
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;
}
bool materializeFunction(Function *F, std::string *ErrInfo = 0) {
return false;
}
Module* materializeModule(std::string *ErrInfo = 0) { return TheModule; }
};
} // End llvm namespace
#endif
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