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41 * Authors: Steve Reinhardt
46 * User Console Definitions
49 #ifndef __SIM_OBJECT_HH__
50 #define __SIM_OBJECT_HH__
55 #include "params/SimObject.hh"
56 #include "sim/drain.hh"
57 #include "sim/eventq.hh"
58 #include "sim/eventq_impl.hh"
59 #include "sim/serialize.hh"
65 * Abstract superclass for simulation objects. Represents things that
66 * correspond to physical components and can be specified via the
67 * config file (CPUs, caches, etc.).
69 * SimObject initialization is controlled by the instantiate method in
70 * src/python/m5/simulate.py. There are slightly different
71 * initialization paths when starting the simulation afresh and when
72 * loading from a checkpoint. After instantiation and connecting
73 * ports, simulate.py initializes the object using the following call
77 * <li>SimObject::init()
78 * <li>SimObject::regStats()
80 * <li>SimObject::initState() if starting afresh.
81 * <li>SimObject::loadState() if restoring from a checkpoint.
83 * <li>SimObject::resetStats()
84 * <li>SimObject::startup()
85 * <li>Drainable::drainResume() if resuming from a checkpoint.
88 * @note Whenever a method is called on all objects in the simulator's
89 * object tree (e.g., init(), startup(), or loadState()), a pre-order
90 * depth-first traversal is performed (see descendants() in
91 * SimObject.py). This has the effect of calling the method on the
92 * parent node <i>before</i> its children.
94 class SimObject : public EventManager, public Serializable, public Drainable
97 typedef std::vector<SimObject *> SimObjectList;
99 /** List of all instantiated simulation objects. */
100 static SimObjectList simObjectList;
102 /** Manager coordinates hooking up probe points with listeners. */
103 ProbeManager *probeManager;
106 /** Cached copy of the object parameters. */
107 const SimObjectParams *_params;
110 typedef SimObjectParams Params;
111 const Params *params() const { return _params; }
112 SimObject(const Params *_params);
113 virtual ~SimObject();
117 virtual const std::string name() const { return params()->name; }
120 * init() is called after all C++ SimObjects have been created and
121 * all ports are connected. Initializations that are independent
122 * of unserialization but rely on a fully instantiated and
123 * connected SimObject graph should be done here.
128 * loadState() is called on each SimObject when restoring from a
129 * checkpoint. The default implementation simply calls
130 * unserialize() if there is a corresponding section in the
131 * checkpoint. However, objects can override loadState() to get
132 * other behaviors, e.g., doing other programmed initializations
133 * after unserialize(), or complaining if no checkpoint section is
136 * @param cp Checkpoint to restore the state from.
138 virtual void loadState(CheckpointIn &cp);
141 * initState() is called on each SimObject when *not* restoring
142 * from a checkpoint. This provides a hook for state
143 * initializations that are only required for a "cold start".
145 virtual void initState();
148 * Register statistics for this object.
150 virtual void regStats();
153 * Reset statistics associated with this object.
155 virtual void resetStats();
158 * Register probe points for this object.
160 virtual void regProbePoints();
163 * Register probe listeners for this object.
165 virtual void regProbeListeners();
168 * Get the probe manager for this object.
170 ProbeManager *getProbeManager();
173 * startup() is the final initialization call before simulation.
174 * All state is initialized (including unserialized state, if any,
175 * such as the curTick() value), so this is the appropriate place to
176 * schedule initial event(s) for objects that need them.
178 virtual void startup();
181 * Provide a default implementation of the drain interface for
182 * objects that don't need draining.
184 DrainState drain() override { return DrainState::Drained; }
187 * Write back dirty buffers to memory using functional writes.
189 * After returning, an object implementing this method should have
190 * written all its dirty data back to memory. This method is
191 * typically used to prepare a system with caches for
194 virtual void memWriteback() {};
197 * Invalidate the contents of memory buffers.
199 * When the switching to hardware virtualized CPU models, we need
200 * to make sure that we don't have any cached state in the system
201 * that might become stale when we return. This method is used to
202 * flush all such state back to main memory.
204 * @warn This does <i>not</i> cause any dirty state to be written
207 virtual void memInvalidate() {};
209 void serialize(CheckpointOut &cp) const override {};
210 void unserialize(CheckpointIn &cp) override {};
213 * Serialize all SimObjects in the system.
215 static void serializeAll(CheckpointOut &cp);
220 static void debugObjectBreak(const std::string &objs);
224 * Find the SimObject with the given name and return a pointer to
225 * it. Primarily used for interactive debugging. Argument is
226 * char* rather than std::string to make it callable from gdb.
228 static SimObject *find(const char *name);
232 * Base class to wrap object resolving functionality.
234 * This can be provided to the serialization framework to allow it to
235 * map object names onto C++ objects.
237 class SimObjectResolver
240 virtual ~SimObjectResolver() { }
242 // Find a SimObject given a full path name
243 virtual SimObject *resolveSimObject(const std::string &name) = 0;
247 void debugObjectBreak(const char *objs);
250 #endif // __SIM_OBJECT_HH__