sim_object.hh revision 7823:dac01f14f20f 
1/*
2 * Copyright (c) 2001-2005 The Regents of The University of Michigan
3 * Copyright (c) 2010 Advanced Micro Devices, Inc.
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions are
8 * met: redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer;
10 * redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution;
13 * neither the name of the copyright holders nor the names of its
14 * contributors may be used to endorse or promote products derived from
15 * this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
18 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
19 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
20 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
21 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
22 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
23 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 *
29 * Authors: Steve Reinhardt
30 *          Nathan Binkert
31 */
32
33/* @file
34 * User Console Definitions
35 */
36
37#ifndef __SIM_OBJECT_HH__
38#define __SIM_OBJECT_HH__
39
40#include <iostream>
41#include <list>
42#include <map>
43#include <string>
44#include <vector>
45
46#include "params/SimObject.hh"
47#include "sim/eventq.hh"
48#include "sim/serialize.hh"
49
50class BaseCPU;
51class Event;
52
53/*
54 * Abstract superclass for simulation objects.  Represents things that
55 * correspond to physical components and can be specified via the
56 * config file (CPUs, caches, etc.).
57 */
58class SimObject : public EventManager, public Serializable
59{
60  public:
61    enum State {
62        Running,
63        Draining,
64        Drained
65    };
66
67  private:
68    State state;
69
70  protected:
71    void changeState(State new_state) { state = new_state; }
72
73  public:
74    State getState() { return state; }
75
76  private:
77    typedef std::vector<SimObject *> SimObjectList;
78
79    // list of all instantiated simulation objects
80    static SimObjectList simObjectList;
81
82  protected:
83    const SimObjectParams *_params;
84
85  public:
86    typedef SimObjectParams Params;
87    const Params *params() const { return _params; }
88    SimObject(const Params *_params);
89    virtual ~SimObject() {}
90
91  public:
92
93    virtual const std::string name() const { return params()->name; }
94
95    // The following SimObject initialization methods are called from
96    // the instantiate() method in src/python/m5/simulate.py.  See
97    // that function for details on how/when these methods are
98    // invoked.
99
100    /**
101     * init() is called after all C++ SimObjects have been created and
102     * all ports are connected.  Initializations that are independent
103     * of unserialization but rely on a fully instantiated and
104     * connected SimObject graph should be done here.
105     */
106    virtual void init();
107
108    /**
109     * loadState() is called on each SimObject when restoring from a
110     * checkpoint.  The default implementation simply calls
111     * unserialize() if there is a corresponding section in the
112     * checkpoint.  However, objects can override loadState() to get
113     * other behaviors, e.g., doing other programmed initializations
114     * after unserialize(), or complaining if no checkpoint section is
115     * found.
116     */
117    virtual void loadState(Checkpoint *cp);
118
119    /**
120     * initState() is called on each SimObject when *not* restoring
121     * from a checkpoint.  This provides a hook for state
122     * initializations that are only required for a "cold start".
123     */
124    virtual void initState();
125
126    // register statistics for this object
127    virtual void regStats();
128    virtual void regFormulas();
129    virtual void resetStats();
130
131    /**
132     * startup() is the final initialization call before simulation.
133     * All state is initialized (including unserialized state, if any,
134     * such as the curTick() value), so this is the appropriate place to
135     * schedule initial event(s) for objects that need them.
136     */
137    virtual void startup();
138
139    // static: call nameOut() & serialize() on all SimObjects
140    static void serializeAll(std::ostream &);
141    static void unserializeAll(Checkpoint *cp);
142
143    // Methods to drain objects in order to take checkpoints
144    // Or switch from timing -> atomic memory model
145    // Drain returns 0 if the simobject can drain immediately or
146    // the number of times the drain_event's process function will be called
147    // before the object will be done draining. Normally this should be 1
148    virtual unsigned int drain(Event *drain_event);
149    virtual void resume();
150    virtual void setMemoryMode(State new_mode);
151    virtual void switchOut();
152    virtual void takeOverFrom(BaseCPU *cpu);
153
154#ifdef DEBUG
155  public:
156    bool doDebugBreak;
157    static void debugObjectBreak(const std::string &objs);
158#endif
159
160    /**
161     * Find the SimObject with the given name and return a pointer to
162     * it.  Primarily used for interactive debugging.  Argument is
163     * char* rather than std::string to make it callable from gdb.
164     */
165    static SimObject *find(const char *name);
166};
167
168#endif // __SIM_OBJECT_HH__
169