text: //===- CommonLinkerContext.h ------------------------------------*- C++ -*-===//
  //
  // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
  // See https://llvm.org/LICENSE.txt for license information.
  // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
  //
  //===----------------------------------------------------------------------===//
  //
  // Entry point for all global state in lldCommon. The objective is for LLD to be
  // used "as a library" in a thread-safe manner.
  //
  // Instead of program-wide globals or function-local statics, we prefer
  // aggregating all "global" states into a heap-based structure
  // (CommonLinkerContext). This also achieves deterministic initialization &
  // shutdown for all "global" states.
  //
  //===----------------------------------------------------------------------===//
  
  #ifndef LLD_COMMON_COMMONLINKINGCONTEXT_H
  #define LLD_COMMON_COMMONLINKINGCONTEXT_H
  
  #include "lld/Common/ErrorHandler.h"
  #include "lld/Common/Memory.h"
  #include "llvm/Support/StringSaver.h"
  
  namespace llvm {
  class raw_ostream;
  } // namespace llvm
  
  namespace lld {
  struct SpecificAllocBase;
  class CommonLinkerContext {
  public:
    CommonLinkerContext();
    virtual ~CommonLinkerContext();
  
    static void destroy();
  
    llvm::BumpPtrAllocator bAlloc;
    llvm::StringSaver saver{bAlloc};
    llvm::DenseMap<void *, SpecificAllocBase *> instances;
  
    ErrorHandler e;
  };
  
  // Retrieve the global state. Currently only one state can exist per process,
  // but in the future we plan on supporting an arbitrary number of LLD instances
  // in a single process.
  CommonLinkerContext &commonContext();
  
  template <typename T = CommonLinkerContext> T &context() {
    return static_cast<T &>(commonContext());
  }
  
  bool hasContext();
  
  inline llvm::StringSaver &saver() { return context().saver; }
  inline llvm::BumpPtrAllocator &bAlloc() { return context().bAlloc; }
  } // namespace lld
  
  #endif
  