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//===-- History.h -----------------------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#ifndef lldb_History_h_
#define lldb_History_h_
// C Includes
#include <stdint.h>
// C++ Includes
#include <stack>
#include <string>
// Other libraries and framework includes
// Project includes
#include "lldb/lldb-public.h"
#include "lldb/Host/Mutex.h"
namespace lldb_private {
//----------------------------------------------------------------------
/// @class HistorySource History.h "lldb/Core/History.h"
/// @brief A class that defines history events.
//----------------------------------------------------------------------
class HistorySource
{
public:
typedef const void * HistoryEvent;
HistorySource () :
m_mutex (Mutex::eMutexTypeRecursive),
m_events ()
{
}
virtual
~HistorySource()
{
}
// Create a new history event. Subclasses should use any data or members
// in the subclass of this class to produce a history event and push it
// onto the end of the history stack.
virtual HistoryEvent
CreateHistoryEvent () = 0;
virtual void
DeleteHistoryEvent (HistoryEvent event) = 0;
virtual void
DumpHistoryEvent (Stream &strm, HistoryEvent event) = 0;
virtual size_t
GetHistoryEventCount() = 0;
virtual HistoryEvent
GetHistoryEventAtIndex (uint32_t idx) = 0;
virtual HistoryEvent
GetCurrentHistoryEvent () = 0;
// Return 0 when lhs == rhs, 1 if lhs > rhs, or -1 if lhs < rhs.
virtual int
CompareHistoryEvents (const HistoryEvent lhs,
const HistoryEvent rhs) = 0;
virtual bool
IsCurrentHistoryEvent (const HistoryEvent event) = 0;
private:
typedef std::stack<HistoryEvent> collection;
Mutex m_mutex;
collection m_events;
DISALLOW_COPY_AND_ASSIGN (HistorySource);
};
//----------------------------------------------------------------------
/// @class HistorySourceUInt History.h "lldb/Core/History.h"
/// @brief A class that defines history events that are represented by
/// unsigned integers.
///
/// Any history event that is defined by a unique monotonically
/// increasing unsigned integer
//----------------------------------------------------------------------
class HistorySourceUInt : public HistorySource
{
HistorySourceUInt (const char *id_name, uintptr_t start_value = 0u) :
HistorySource(),
m_name (id_name),
m_curr_id (start_value)
{
}
virtual
~HistorySourceUInt()
{
}
// Create a new history event. Subclasses should use any data or members
// in the subclass of this class to produce a history event and push it
// onto the end of the history stack.
virtual HistoryEvent
CreateHistoryEvent ()
{
++m_curr_id;
return (HistoryEvent)m_curr_id;
}
virtual void
DeleteHistoryEvent (HistoryEvent event)
{
// Nothing to delete, the event contains the integer
}
virtual void
DumpHistoryEvent (Stream &strm, HistoryEvent event);
virtual size_t
GetHistoryEventCount()
{
return m_curr_id;
}
virtual HistoryEvent
GetHistoryEventAtIndex (uint32_t idx)
{
return (HistoryEvent)((uintptr_t)idx);
}
virtual HistoryEvent
GetCurrentHistoryEvent ()
{
return (HistoryEvent)m_curr_id;
}
// Return 0 when lhs == rhs, 1 if lhs > rhs, or -1 if lhs < rhs.
virtual int
CompareHistoryEvents (const HistoryEvent lhs,
const HistoryEvent rhs)
{
uintptr_t lhs_uint = (uintptr_t)lhs;
uintptr_t rhs_uint = (uintptr_t)rhs;
if (lhs_uint < rhs_uint)
return -1;
if (lhs_uint > rhs_uint)
return +1;
return 0;
}
virtual bool
IsCurrentHistoryEvent (const HistoryEvent event)
{
return (uintptr_t)event == m_curr_id;
}
protected:
std::string m_name; // The name of the history unsigned integer
uintptr_t m_curr_id; // The current value of the history unsigned unteger
};
} // namespace lldb_private
#endif // lldb_History_h_
|
