src/third_party/llvm-project/lldb/include/lldb/Target/SectionLoadHistory.h

//===-- SectionLoadHistory.h ------------------------------------*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

#ifndef liblldb_SectionLoadHistory_h_
#define liblldb_SectionLoadHistory_h_

// C Includes
// C++ Includes
#include <map>
#include <mutex>

// Project includes
#include "lldb/lldb-public.h"

namespace lldb_private {

class SectionLoadHistory {
public:
  enum : unsigned {
    // Pass eStopIDNow to any function that takes a stop ID to get the current
    // value.
    eStopIDNow = UINT32_MAX
  };
  //------------------------------------------------------------------
  // Constructors and Destructors
  //------------------------------------------------------------------
  SectionLoadHistory() : m_stop_id_to_section_load_list(), m_mutex() {}

  ~SectionLoadHistory() {
    // Call clear since this takes a lock and clears the section load list in
    // case another thread is currently using this section load list
    Clear();
  }

  SectionLoadList &GetCurrentSectionLoadList();

  bool IsEmpty() const;

  void Clear();

  uint32_t GetLastStopID() const;

  // Get the section load address given a process stop ID
  lldb::addr_t GetSectionLoadAddress(uint32_t stop_id,
                                     const lldb::SectionSP &section_sp);

  bool ResolveLoadAddress(uint32_t stop_id, lldb::addr_t load_addr,
                          Address &so_addr);

  bool SetSectionLoadAddress(uint32_t stop_id,
                             const lldb::SectionSP &section_sp,
                             lldb::addr_t load_addr,
                             bool warn_multiple = false);

  // The old load address should be specified when unloading to ensure we get
  // the correct instance of the section as a shared library could be loaded at
  // more than one location.
  bool SetSectionUnloaded(uint32_t stop_id, const lldb::SectionSP &section_sp,
                          lldb::addr_t load_addr);

  // Unload all instances of a section. This function can be used on systems
  // that don't support multiple copies of the same shared library to be loaded
  // at the same time.
  size_t SetSectionUnloaded(uint32_t stop_id,
                            const lldb::SectionSP &section_sp);

  void Dump(Stream &s, Target *target);

protected:
  SectionLoadList *GetSectionLoadListForStopID(uint32_t stop_id,
                                               bool read_only);

  typedef std::map<uint32_t, lldb::SectionLoadListSP> StopIDToSectionLoadList;
  StopIDToSectionLoadList m_stop_id_to_section_load_list;
  mutable std::recursive_mutex m_mutex;

private:
  DISALLOW_COPY_AND_ASSIGN(SectionLoadHistory);
};

} // namespace lldb_private

#endif // liblldb_SectionLoadHistory_h_