//===-- llvm/LLVMContext.h - Class for managing "global" state --*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file declares LLVMContext, a container of "global" state in LLVM, such
// as the global type and constant uniquing tables.
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_LLVMCONTEXT_H
#define LLVM_LLVMCONTEXT_H

namespace llvm {

class LLVMContextImpl;

/// This is an important class for using LLVM in a threaded context.  It
/// (opaquely) owns and manages the core "global" data of LLVM's core 
/// infrastructure, including the type and constant uniquing tables.
/// LLVMContext itself provides no locking guarantees, so you should be careful
/// to have one context per thread.
class LLVMContext {
  // DO NOT IMPLEMENT
  LLVMContext(LLVMContext&);
  void operator=(LLVMContext&);
public:
  LLVMContextImpl* pImpl;
  bool RemoveDeadMetadata();
  LLVMContext();
  ~LLVMContext();
};

/// FOR BACKWARDS COMPATIBILITY - Returns a global context.
extern LLVMContext& getGlobalContext();

}

#endif