DynamicLoaderMacOS.h

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//===-- DynamicLoaderMacOS.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
//
//===----------------------------------------------------------------------===//
 
// This is the DynamicLoader plugin for Darwin (macOS / iPhoneOS / tvOS /
// watchOS / BridgeOS)
// platforms late 2016 and newer, where lldb will call dyld SPI functions to get
// information about shared libraries, information about the shared cache, and
// the _dyld_debugger_notification function we put a breakpoint on give us an
// array of load addresses for solibs loaded and unloaded.  The SPI will tell us
// about both dyld and the executable, in addition to all of the usual solibs.
 
#ifndef LLDB_SOURCE_PLUGINS_DYNAMICLOADER_MACOSX_DYLD_DYNAMICLOADERMACOS_H
#define LLDB_SOURCE_PLUGINS_DYNAMICLOADER_MACOSX_DYLD_DYNAMICLOADERMACOS_H
 
#include <mutex>
#include <vector>
 
#include "lldb/Target/DynamicLoader.h"
#include "lldb/Target/Process.h"
#include "lldb/Utility/FileSpec.h"
#include "lldb/Utility/StructuredData.h"
#include "lldb/Utility/UUID.h"
 
#include "DynamicLoaderDarwin.h"
 
class DynamicLoaderMacOS : public lldb_private::DynamicLoaderDarwin {
public:
  DynamicLoaderMacOS(lldb_private::Process *process);
 
  ~DynamicLoaderMacOS() override;
 
  // Static Functions
  static void Initialize();
 
  static void Terminate();
 
  static llvm::StringRef GetPluginNameStatic() { return "macos-dyld"; }
 
  static llvm::StringRef GetPluginDescriptionStatic();
 
  static lldb_private::DynamicLoader *
  CreateInstance(lldb_private::Process *process, bool force);
 
  /// Called after attaching a process.
  ///
  /// Allow DynamicLoader plug-ins to execute some code after
  /// attaching to a process.
  bool ProcessDidExec() override;
 
  lldb_private::Status CanLoadImage() override;
 
  bool GetSharedCacheInformation(
      lldb::addr_t &base_address, lldb_private::UUID &uuid,
      lldb_private::LazyBool &using_shared_cache,
      lldb_private::LazyBool &private_shared_cache) override;
 
  // PluginInterface protocol
  llvm::StringRef GetPluginName() override { return GetPluginNameStatic(); }
 
protected:
  void PutToLog(lldb_private::Log *log) const;
 
  void DoInitialImageFetch() override;
 
  bool NeedToDoInitialImageFetch() override;
 
  bool DidSetNotificationBreakpoint() override;
 
  bool SetDYLDHandoverBreakpoint(lldb::addr_t notification_address);
 
  void ClearDYLDHandoverBreakpoint();
 
  void AddBinaries(const std::vector<lldb::addr_t> &load_addresses);
 
  void DoClear() override;
 
  bool IsFullyInitialized() override;
 
  static bool
  NotifyBreakpointHit(void *baton,
                      lldb_private::StoppointCallbackContext *context,
                      lldb::user_id_t break_id, lldb::user_id_t break_loc_id);
 
  lldb::addr_t GetNotificationFuncAddrFromImageInfos();
 
  bool SetNotificationBreakpoint() override;
 
  void ClearNotificationBreakpoint() override;
 
  void UpdateImageInfosHeaderAndLoadCommands(ImageInfo::collection &image_infos,
                                             uint32_t infos_count,
                                             bool update_executable);
 
  lldb::addr_t
  GetDyldLockVariableAddressFromModule(lldb_private::Module *module);
 
  uint32_t m_image_infos_stop_id; // The Stop ID the last time we
                                  // loaded/unloaded images
  lldb::user_id_t m_break_id;
  lldb::user_id_t m_dyld_handover_break_id;
  mutable std::recursive_mutex m_mutex;
  lldb::addr_t m_maybe_image_infos_address; // If dyld is still maintaining the
                                            // all_image_infos address, store it
                                            // here so we can use it to detect
                                            // exec's when talking to
                                            // debugservers that don't support
                                            // the "reason:exec" annotation.
  bool m_libsystem_fully_initalized;
};
 
#endif // LLDB_SOURCE_PLUGINS_DYNAMICLOADER_MACOSX_DYLD_DYNAMICLOADERMACOS_H