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//===-- Listener.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
//
//===----------------------------------------------------------------------===//
#ifndef LLDB_UTILITY_LISTENER_H
#define LLDB_UTILITY_LISTENER_H
#include "lldb/Utility/Broadcaster.h"
#include "lldb/Utility/Timeout.h"
#include "lldb/lldb-defines.h"
#include "lldb/lldb-forward.h"
#include <condition_variable>
#include <list>
#include <map>
#include <memory>
#include <mutex>
#include <ratio>
#include <string>
#include <vector>
#include <stddef.h>
#include <stdint.h>
namespace lldb_private {
class ConstString;
}
namespace lldb_private {
class Event;
}
namespace lldb_private {
class Listener : public std::enable_shared_from_this<Listener> {
public:
typedef bool (*HandleBroadcastCallback)(lldb::EventSP &event_sp, void *baton);
friend class Broadcaster;
friend class BroadcasterManager;
//------------------------------------------------------------------
// Constructors and Destructors
//------------------------------------------------------------------
//
// Listeners have to be constructed into shared pointers - at least if you
// want them to listen to Broadcasters,
protected:
Listener(const char *name);
public:
static lldb::ListenerSP MakeListener(const char *name);
~Listener();
void AddEvent(lldb::EventSP &event);
void Clear();
const char *GetName() { return m_name.c_str(); }
uint32_t StartListeningForEventSpec(lldb::BroadcasterManagerSP manager_sp,
const BroadcastEventSpec &event_spec);
bool StopListeningForEventSpec(lldb::BroadcasterManagerSP manager_sp,
const BroadcastEventSpec &event_spec);
uint32_t StartListeningForEvents(Broadcaster *broadcaster,
uint32_t event_mask);
uint32_t StartListeningForEvents(Broadcaster *broadcaster,
uint32_t event_mask,
HandleBroadcastCallback callback,
void *callback_user_data);
bool StopListeningForEvents(Broadcaster *broadcaster, uint32_t event_mask);
Event *PeekAtNextEvent();
Event *PeekAtNextEventForBroadcaster(Broadcaster *broadcaster);
Event *PeekAtNextEventForBroadcasterWithType(Broadcaster *broadcaster,
uint32_t event_type_mask);
// Returns true if an event was received, false if we timed out.
bool GetEvent(lldb::EventSP &event_sp, const Timeout<std::micro> &timeout);
bool GetEventForBroadcaster(Broadcaster *broadcaster, lldb::EventSP &event_sp,
const Timeout<std::micro> &timeout);
bool GetEventForBroadcasterWithType(Broadcaster *broadcaster,
uint32_t event_type_mask,
lldb::EventSP &event_sp,
const Timeout<std::micro> &timeout);
size_t HandleBroadcastEvent(lldb::EventSP &event_sp);
private:
//------------------------------------------------------------------
// Classes that inherit from Listener can see and modify these
//------------------------------------------------------------------
struct BroadcasterInfo {
BroadcasterInfo(uint32_t mask, HandleBroadcastCallback cb = nullptr,
void *ud = nullptr)
: event_mask(mask), callback(cb), callback_user_data(ud) {}
uint32_t event_mask;
HandleBroadcastCallback callback;
void *callback_user_data;
};
typedef std::multimap<Broadcaster::BroadcasterImplWP, BroadcasterInfo,
std::owner_less<Broadcaster::BroadcasterImplWP>>
broadcaster_collection;
typedef std::list<lldb::EventSP> event_collection;
typedef std::vector<lldb::BroadcasterManagerWP>
broadcaster_manager_collection;
bool
FindNextEventInternal(std::unique_lock<std::mutex> &lock,
Broadcaster *broadcaster, // nullptr for any broadcaster
const ConstString *sources, // nullptr for any event
uint32_t num_sources, uint32_t event_type_mask,
lldb::EventSP &event_sp, bool remove);
bool GetEventInternal(const Timeout<std::micro> &timeout,
Broadcaster *broadcaster, // nullptr for any broadcaster
const ConstString *sources, // nullptr for any event
uint32_t num_sources, uint32_t event_type_mask,
lldb::EventSP &event_sp);
std::string m_name;
broadcaster_collection m_broadcasters;
std::recursive_mutex m_broadcasters_mutex; // Protects m_broadcasters
event_collection m_events;
std::mutex m_events_mutex; // Protects m_broadcasters and m_events
std::condition_variable m_events_condition;
broadcaster_manager_collection m_broadcaster_managers;
void BroadcasterWillDestruct(Broadcaster *);
void BroadcasterManagerWillDestruct(lldb::BroadcasterManagerSP manager_sp);
// broadcaster_collection::iterator
// FindBroadcasterWithMask (Broadcaster *broadcaster,
// uint32_t event_mask,
// bool exact);
//------------------------------------------------------------------
// For Listener only
//------------------------------------------------------------------
DISALLOW_COPY_AND_ASSIGN(Listener);
};
} // namespace lldb_private
#endif // LLDB_UTILITY_LISTENER_H
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