llvm-project/lldb/tools/lldb-mi/MICmnLog.h

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

#pragma once

// Third party headers:
#include <map>

// In-house headers:
#include "MICmnBase.h"
#include "MIUtilSingletonBase.h"
#include "MIUtilString.h"

//++
//============================================================================
// Details: MI common code implementation class. Handle application trace
//          activity logging. Medium objects derived from the Medium abstract
///          class are registered with this logger. The function Write is called
//          by a client callee to log information. That information is given to
//          registered relevant mediums. The medium file is registered during
//          *this logs initialization so it will always have a file log for the
//          application.
//          Singleton class.
//--
class CMICmnLog : public MI::ISingleton<CMICmnLog> {
  friend MI::ISingleton<CMICmnLog>;

  // Enumeration:
public:
  //++
  // Description: Data given to the Logger can be of several types. The Logger
  // can be
  //              set at levels of verbosity. Can determine how data is sent to
  //              one or
  //              mediums.
  //--
  enum ELogVerbosity { // Descriptions of what 'may' occur, depends ultimately
                       // on the medium itself. See the medium.
    eLogVerbosity_FnTrace = 0x00000004,   // Debug function stack call tracing
    eLogVerbosity_DbgOp = 0x00000008,     // Send a string to the debugger for
                                          // display (not implemented)
    eLogVerbosity_ClientMsg = 0x00000010, // A client using MI can insert
                                          // messages into the log (not
                                          // implemented)
    eLogVerbosity_Log = 0x00000020        // Send to only the Log file.
  };

  // Class:
public:
  //++
  // Description: Register a medium derived from this interface which will be
  //              called writing log trace data i.e. a file or a console.
  //              Medium objects registered are not owned by *this logger.
  //--
  class IMedium {
  public:
    virtual bool Initialize() = 0;
    virtual const CMIUtilString &GetName() const = 0;
    virtual bool Write(const CMIUtilString &vData,
                       const ELogVerbosity veType) = 0;
    virtual const CMIUtilString &GetError() const = 0;
    virtual bool Shutdown() = 0;

    // Not part of the interface, ignore
    // AD:  This virtual destructor seems to hit a bug in the stdlib
    //      where vector delete is incorrectly called.  Workaround is
    //      to comment this out while I investigate.
    /* dtor */ virtual ~IMedium() {}
  };

  // Statics:
public:
  static bool WriteLog(const CMIUtilString &vData);

  // Methods:
public:
  bool RegisterMedium(const IMedium &vrMedium);
  bool UnregisterMedium(const IMedium &vrMedium);
  bool Write(const CMIUtilString &vData, const ELogVerbosity veType);
  bool SetEnabled(const bool vbYes);
  bool GetEnabled() const;

  // MI common object handling - duplicate of CMICmnBase functions, necessary
  // for LINUX build
  // Done to stop locking on object construction init circular dependency.
  const CMIUtilString &GetErrorDescription() const;
  void SetErrorDescription(const CMIUtilString &vrTxt) const;
  void ClrErrorDescription() const;

  // Overridden:
public:
  // From MI::ISingleton
  bool Initialize() override;
  bool Shutdown() override;

  // Methods:
private:
  /* ctor */ CMICmnLog();
  /* ctor */ CMICmnLog(const CMICmnLog &);
  void operator=(const CMICmnLog &);

  // Overridden:
private:
  // From CMICmnBase
  /* dtor */ ~CMICmnLog() override;

  // Typedef:
private:
  typedef std::map<IMedium *, CMIUtilString> MapMediumToName_t;
  typedef std::pair<IMedium *, CMIUtilString> MapPairMediumToName_t;

  // Methods:
private:
  bool HaveMediumAlready(const IMedium &vrMedium) const;
  bool UnregisterMediumAll();

  // Attributes:
private:
  bool m_bRecursiveDive; // True = yes recursive, false = no
  MapMediumToName_t m_mapMediumToName;
  bool m_bEnabled; // True = Logger enabled for writing to mediums, false =
                   // medium not written to
  bool m_bInitializingATM; // True = Yes in process of initing *this logger,
                           // false = not initing
  //
  // MI common object handling - duplicate of CMICmnBase functions, necessary
  // for LINUX build
  bool m_bInitialized; // True = yes successfully initialized, false = no yet or
                       // failed
  mutable CMIUtilString m_strMILastErrorDescription;
  MIint m_clientUsageRefCnt; // Count of client using *this object so not
                             // shutdown() object to early
};