1/*
2 * Copyright (c) 2015 ARM Limited
3 * All rights reserved
4 *
5 * The license below extends only to copyright in the software and shall
6 * not be construed as granting a license to any other intellectual
7 * property including but not limited to intellectual property relating
8 * to a hardware implementation of the functionality of the software
9 * licensed hereunder. You may use the software subject to the license
10 * terms below provided that you ensure that this notice is replicated
11 * unmodified and in its entirety in all distributions of the software,
12 * modified or unmodified, in source code or in binary form.
13 *
14 * Copyright (c) 2002-2005 The Regents of The University of Michigan
15 * All rights reserved.
16 *
17 * Redistribution and use in source and binary forms, with or without
18 * modification, are permitted provided that the following conditions are
19 * met: redistributions of source code must retain the above copyright
20 * notice, this list of conditions and the following disclaimer;
21 * redistributions in binary form must reproduce the above copyright
22 * notice, this list of conditions and the following disclaimer in the
23 * documentation and/or other materials provided with the distribution;
24 * neither the name of the copyright holders nor the names of its
25 * contributors may be used to endorse or promote products derived from
26 * this software without specific prior written permission.
27 *
28 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
29 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
30 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
31 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
32 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
33 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
34 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
35 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
36 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
37 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
38 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
39 *
40 * Authors: Nathan Binkert
41 * Erik Hallnor
42 * Steve Reinhardt
43 * Andreas Sandberg
44 */
45
46/* @file
47 * Serialization Interface Declarations
48 */
49
50#ifndef __SERIALIZE_HH__
51#define __SERIALIZE_HH__
52
53
54#include <iostream>
55#include <list>
56#include <map>
57#include <stack>
58#include <vector>
59
60#include "base/bitunion.hh"
61#include "base/types.hh"
62
63class IniFile;
64class Serializable;
65class CheckpointIn;
66class SimObject;
67class EventQueue;
68
69typedef std::ostream CheckpointOut;
70
71
72/** The current version of the checkpoint format.
73 * This should be incremented by 1 and only 1 for every new version, where a new
74 * version is defined as a checkpoint created before this version won't work on
75 * the current version until the checkpoint format is updated. Adding a new
76 * SimObject shouldn't cause the version number to increase, only changes to
77 * existing objects such as serializing/unserializing more state, changing sizes
78 * of serialized arrays, etc. */
79static const uint64_t gem5CheckpointVersion = 0x000000000000000e;
80
81template <class T>
82void paramOut(CheckpointOut &cp, const std::string &name, const T ¶m);
83
84template <typename DataType, typename BitUnion>
85void paramOut(CheckpointOut &cp, const std::string &name,
86 const BitfieldBackend::BitUnionOperators<DataType, BitUnion> &p)
87{
88 paramOut(cp, name, p.__data);
89}
90
91template <class T>
92void paramIn(CheckpointIn &cp, const std::string &name, T ¶m);
93
94template <typename DataType, typename BitUnion>
95void paramIn(CheckpointIn &cp, const std::string &name,
96 BitfieldBackend::BitUnionOperators<DataType, BitUnion> &p)
97{
98 paramIn(cp, name, p.__data);
99}
100
101template <class T>
102bool optParamIn(CheckpointIn &cp, const std::string &name, T ¶m);
103
104template <typename DataType, typename BitUnion>
105bool optParamIn(CheckpointIn &cp, const std::string &name,
106 BitfieldBackend::BitUnionOperators<DataType, BitUnion> &p)
107{
108 return optParamIn(cp, name, p.__data);
109}
110
111template <class T>
112void arrayParamOut(CheckpointOut &cp, const std::string &name,
113 const T *param, unsigned size);
114
115template <class T>
116void arrayParamOut(CheckpointOut &cp, const std::string &name,
117 const std::vector<T> ¶m);
118
119template <class T>
120void arrayParamOut(CheckpointOut &cp, const std::string &name,
121 const std::list<T> ¶m);
122
123template <class T>
124void arrayParamIn(CheckpointIn &cp, const std::string &name,
125 T *param, unsigned size);
126
127template <class T>
128void arrayParamIn(CheckpointIn &cp, const std::string &name,
129 std::vector<T> ¶m);
130
131template <class T>
132void arrayParamIn(CheckpointIn &cp, const std::string &name,
133 std::list<T> ¶m);
134
135void
136objParamIn(CheckpointIn &cp, const std::string &name, SimObject * ¶m);
137
138template <typename T>
139void fromInt(T &t, int i)
140{
141 t = (T)i;
142}
143
144template <typename T>
145void fromSimObject(T &t, SimObject *s)
146{
147 t = dynamic_cast<T>(s);
148}
149
150//
151// These macros are streamlined to use in serialize/unserialize
152// functions. It's assumed that serialize() has a parameter 'os' for
153// the ostream, and unserialize() has parameters 'cp' and 'section'.
154#define SERIALIZE_SCALAR(scalar) paramOut(cp, #scalar, scalar)
155
156#define UNSERIALIZE_SCALAR(scalar) paramIn(cp, #scalar, scalar)
157#define UNSERIALIZE_OPT_SCALAR(scalar) optParamIn(cp, #scalar, scalar)
158
159// ENUMs are like SCALARs, but we cast them to ints on the way out
160#define SERIALIZE_ENUM(scalar) paramOut(cp, #scalar, (int)scalar)
161
162#define UNSERIALIZE_ENUM(scalar) \
163 do { \
164 int tmp; \
165 paramIn(cp, #scalar, tmp); \
166 fromInt(scalar, tmp); \
167 } while (0)
168
169#define SERIALIZE_ARRAY(member, size) \
170 arrayParamOut(cp, #member, member, size)
171
172#define UNSERIALIZE_ARRAY(member, size) \
173 arrayParamIn(cp, #member, member, size)
174
175#define SERIALIZE_CONTAINER(member) \
176 arrayParamOut(cp, #member, member)
177
178#define UNSERIALIZE_CONTAINER(member) \
179 arrayParamIn(cp, #member, member)
180
| 1/*
2 * Copyright (c) 2015 ARM Limited
3 * All rights reserved
4 *
5 * The license below extends only to copyright in the software and shall
6 * not be construed as granting a license to any other intellectual
7 * property including but not limited to intellectual property relating
8 * to a hardware implementation of the functionality of the software
9 * licensed hereunder. You may use the software subject to the license
10 * terms below provided that you ensure that this notice is replicated
11 * unmodified and in its entirety in all distributions of the software,
12 * modified or unmodified, in source code or in binary form.
13 *
14 * Copyright (c) 2002-2005 The Regents of The University of Michigan
15 * All rights reserved.
16 *
17 * Redistribution and use in source and binary forms, with or without
18 * modification, are permitted provided that the following conditions are
19 * met: redistributions of source code must retain the above copyright
20 * notice, this list of conditions and the following disclaimer;
21 * redistributions in binary form must reproduce the above copyright
22 * notice, this list of conditions and the following disclaimer in the
23 * documentation and/or other materials provided with the distribution;
24 * neither the name of the copyright holders nor the names of its
25 * contributors may be used to endorse or promote products derived from
26 * this software without specific prior written permission.
27 *
28 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
29 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
30 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
31 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
32 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
33 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
34 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
35 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
36 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
37 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
38 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
39 *
40 * Authors: Nathan Binkert
41 * Erik Hallnor
42 * Steve Reinhardt
43 * Andreas Sandberg
44 */
45
46/* @file
47 * Serialization Interface Declarations
48 */
49
50#ifndef __SERIALIZE_HH__
51#define __SERIALIZE_HH__
52
53
54#include <iostream>
55#include <list>
56#include <map>
57#include <stack>
58#include <vector>
59
60#include "base/bitunion.hh"
61#include "base/types.hh"
62
63class IniFile;
64class Serializable;
65class CheckpointIn;
66class SimObject;
67class EventQueue;
68
69typedef std::ostream CheckpointOut;
70
71
72/** The current version of the checkpoint format.
73 * This should be incremented by 1 and only 1 for every new version, where a new
74 * version is defined as a checkpoint created before this version won't work on
75 * the current version until the checkpoint format is updated. Adding a new
76 * SimObject shouldn't cause the version number to increase, only changes to
77 * existing objects such as serializing/unserializing more state, changing sizes
78 * of serialized arrays, etc. */
79static const uint64_t gem5CheckpointVersion = 0x000000000000000e;
80
81template <class T>
82void paramOut(CheckpointOut &cp, const std::string &name, const T ¶m);
83
84template <typename DataType, typename BitUnion>
85void paramOut(CheckpointOut &cp, const std::string &name,
86 const BitfieldBackend::BitUnionOperators<DataType, BitUnion> &p)
87{
88 paramOut(cp, name, p.__data);
89}
90
91template <class T>
92void paramIn(CheckpointIn &cp, const std::string &name, T ¶m);
93
94template <typename DataType, typename BitUnion>
95void paramIn(CheckpointIn &cp, const std::string &name,
96 BitfieldBackend::BitUnionOperators<DataType, BitUnion> &p)
97{
98 paramIn(cp, name, p.__data);
99}
100
101template <class T>
102bool optParamIn(CheckpointIn &cp, const std::string &name, T ¶m);
103
104template <typename DataType, typename BitUnion>
105bool optParamIn(CheckpointIn &cp, const std::string &name,
106 BitfieldBackend::BitUnionOperators<DataType, BitUnion> &p)
107{
108 return optParamIn(cp, name, p.__data);
109}
110
111template <class T>
112void arrayParamOut(CheckpointOut &cp, const std::string &name,
113 const T *param, unsigned size);
114
115template <class T>
116void arrayParamOut(CheckpointOut &cp, const std::string &name,
117 const std::vector<T> ¶m);
118
119template <class T>
120void arrayParamOut(CheckpointOut &cp, const std::string &name,
121 const std::list<T> ¶m);
122
123template <class T>
124void arrayParamIn(CheckpointIn &cp, const std::string &name,
125 T *param, unsigned size);
126
127template <class T>
128void arrayParamIn(CheckpointIn &cp, const std::string &name,
129 std::vector<T> ¶m);
130
131template <class T>
132void arrayParamIn(CheckpointIn &cp, const std::string &name,
133 std::list<T> ¶m);
134
135void
136objParamIn(CheckpointIn &cp, const std::string &name, SimObject * ¶m);
137
138template <typename T>
139void fromInt(T &t, int i)
140{
141 t = (T)i;
142}
143
144template <typename T>
145void fromSimObject(T &t, SimObject *s)
146{
147 t = dynamic_cast<T>(s);
148}
149
150//
151// These macros are streamlined to use in serialize/unserialize
152// functions. It's assumed that serialize() has a parameter 'os' for
153// the ostream, and unserialize() has parameters 'cp' and 'section'.
154#define SERIALIZE_SCALAR(scalar) paramOut(cp, #scalar, scalar)
155
156#define UNSERIALIZE_SCALAR(scalar) paramIn(cp, #scalar, scalar)
157#define UNSERIALIZE_OPT_SCALAR(scalar) optParamIn(cp, #scalar, scalar)
158
159// ENUMs are like SCALARs, but we cast them to ints on the way out
160#define SERIALIZE_ENUM(scalar) paramOut(cp, #scalar, (int)scalar)
161
162#define UNSERIALIZE_ENUM(scalar) \
163 do { \
164 int tmp; \
165 paramIn(cp, #scalar, tmp); \
166 fromInt(scalar, tmp); \
167 } while (0)
168
169#define SERIALIZE_ARRAY(member, size) \
170 arrayParamOut(cp, #member, member, size)
171
172#define UNSERIALIZE_ARRAY(member, size) \
173 arrayParamIn(cp, #member, member, size)
174
175#define SERIALIZE_CONTAINER(member) \
176 arrayParamOut(cp, #member, member)
177
178#define UNSERIALIZE_CONTAINER(member) \
179 arrayParamIn(cp, #member, member)
180
|
181#define SERIALIZE_OBJPTR(objptr) paramOut(cp, #objptr, (objptr)->name())
182
183#define UNSERIALIZE_OBJPTR(objptr) \
184 do { \
185 SimObject *sptr; \
186 objParamIn(cp, #objptr, sptr); \
187 fromSimObject(objptr, sptr); \
188 } while (0)
189
190/**
191 * Basic support for object serialization.
192 *
193 * Objects that support serialization should derive from this
194 * class. Such objects can largely be divided into two categories: 1)
195 * True SimObjects (deriving from SimObject), and 2) child objects
196 * (non-SimObjects).
197 *
198 * SimObjects are serialized automatically into their own sections
199 * automatically by the SimObject base class (see
200 * SimObject::serializeAll().
201 *
202 * SimObjects can contain other serializable objects that are not
203 * SimObjects. Much like normal serialized members are not serialized
204 * automatically, these objects will not be serialized automatically
205 * and it is expected that the objects owning such serializable
206 * objects call the required serialization/unserialization methods on
207 * child objects. The preferred method to serialize a child object is
208 * to call serializeSection() on the child, which serializes the
209 * object into a new subsection in the current section. Another option
210 * is to call serialize() directly, which serializes the object into
211 * the current section. The latter is not recommended as it can lead
212 * to naming clashes between objects.
213 *
214 * @note Many objects that support serialization need to be put in a
215 * consistent state when serialization takes place. We refer to the
216 * action of forcing an object into a consistent state as
217 * 'draining'. Objects that need draining inherit from Drainable. See
218 * Drainable for more information.
219 */
220class Serializable
221{
222 protected:
223 /**
224 * Scoped checkpoint section helper class
225 *
226 * This helper class creates a section within a checkpoint without
227 * the need for a separate serializeable object. It is mainly used
228 * within the Serializable class when serializing or unserializing
229 * section (see serializeSection() and unserializeSection()). It
230 * can also be used to maintain backwards compatibility in
231 * existing code that serializes structs that are not inheriting
232 * from Serializable into subsections.
233 *
234 * When the class is instantiated, it appends a name to the active
235 * path in a checkpoint. The old path is later restored when the
236 * instance is destroyed. For example, serializeSection() could be
237 * implemented by instantiating a ScopedCheckpointSection and then
238 * calling serialize() on an object.
239 */
240 class ScopedCheckpointSection {
241 public:
242 template<class CP>
243 ScopedCheckpointSection(CP &cp, const char *name) {
244 pushName(name);
245 nameOut(cp);
246 }
247
248 template<class CP>
249 ScopedCheckpointSection(CP &cp, const std::string &name) {
250 pushName(name.c_str());
251 nameOut(cp);
252 }
253
254 ~ScopedCheckpointSection();
255
256 ScopedCheckpointSection() = delete;
257 ScopedCheckpointSection(const ScopedCheckpointSection &) = delete;
258 ScopedCheckpointSection &operator=(
259 const ScopedCheckpointSection &) = delete;
260 ScopedCheckpointSection &operator=(
261 ScopedCheckpointSection &&) = delete;
262
263 private:
264 void pushName(const char *name);
265 void nameOut(CheckpointOut &cp);
266 void nameOut(CheckpointIn &cp) {};
267 };
268
269 public:
270 Serializable();
271 virtual ~Serializable();
272
273 /**
274 * Serialize an object
275 *
276 * Output an object's state into the current checkpoint section.
277 *
278 * @param cp Checkpoint state
279 */
280 virtual void serialize(CheckpointOut &cp) const = 0;
281
282 /**
283 * Unserialize an object
284 *
285 * Read an object's state from the current checkpoint section.
286 *
287 * @param cp Checkpoint state
288 */
289 virtual void unserialize(CheckpointIn &cp) = 0;
290
291 /**
292 * Serialize an object into a new section
293 *
294 * This method creates a new section in a checkpoint and calls
295 * serialize() to serialize the current object into that
296 * section. The name of the section is appended to the current
297 * checkpoint path.
298 *
299 * @param cp Checkpoint state
300 * @param name Name to append to the active path
301 */
302 void serializeSection(CheckpointOut &cp, const char *name) const;
303
304 void serializeSection(CheckpointOut &cp, const std::string &name) const {
305 serializeSection(cp, name.c_str());
306 }
307
308 /**
309 * Unserialize an a child object
310 *
311 * This method loads a child object from a checkpoint. The object
312 * name is appended to the active path to form a fully qualified
313 * section name and unserialize() is called.
314 *
315 * @param cp Checkpoint state
316 * @param name Name to append to the active path
317 */
318 void unserializeSection(CheckpointIn &cp, const char *name);
319
320 void unserializeSection(CheckpointIn &cp, const std::string &name) {
321 unserializeSection(cp, name.c_str());
322 }
323
324 /**
325 * @{
326 * @name Legacy interface
327 *
328 * Interface for objects that insist on changing their state when
329 * serializing. Such state change should be done in drain(),
330 * memWriteback(), or memInvalidate() and not in the serialization
331 * method. In general, if state changes occur in serialize, it
332 * complicates testing since it breaks assumptions about draining
333 * and serialization. It potentially also makes components more
334 * fragile since they there are no ordering guarantees when
335 * serializing SimObjects.
336 *
337 * @warn This interface is considered deprecated and should never
338 * be used.
339 */
340
341 virtual void serializeOld(CheckpointOut &cp) {
342 serialize(cp);
343 }
344 void serializeSectionOld(CheckpointOut &cp, const char *name);
345 void serializeSectionOld(CheckpointOut &cp, const std::string &name) {
346 serializeSectionOld(cp, name.c_str());
347 }
348 /** @} */
349
350 /** Get the fully-qualified name of the active section */
351 static const std::string ¤tSection();
352
353 static Serializable *create(CheckpointIn &cp, const std::string §ion);
354
355 static int ckptCount;
356 static int ckptMaxCount;
357 static int ckptPrevCount;
358 static void serializeAll(const std::string &cpt_dir);
359 static void unserializeGlobals(CheckpointIn &cp);
360
361 private:
362 static std::stack<std::string> path;
363};
364
365void debug_serialize(const std::string &cpt_dir);
366
367//
368// A SerializableBuilder serves as an evaluation context for a set of
369// parameters that describe a specific instance of a Serializable. This
370// evaluation context corresponds to a section in the .ini file (as
371// with the base ParamContext) plus an optional node in the
372// configuration hierarchy (the configNode member) for resolving
373// Serializable references. SerializableBuilder is an abstract superclass;
374// derived classes specialize the class for particular subclasses of
375// Serializable (e.g., BaseCache).
376//
377// For typical usage, see the definition of
378// SerializableClass::createObject().
379//
380class SerializableBuilder
381{
382 public:
383
384 SerializableBuilder() {}
385
386 virtual ~SerializableBuilder() {}
387
388 // Create the actual Serializable corresponding to the parameter
389 // values in this context. This function is overridden in derived
390 // classes to call a specific constructor for a particular
391 // subclass of Serializable.
392 virtual Serializable *create() = 0;
393};
394
395//
396// An instance of SerializableClass corresponds to a class derived from
397// Serializable. The SerializableClass instance serves to bind the string
398// name (found in the config file) to a function that creates an
399// instance of the appropriate derived class.
400//
401// This would be much cleaner in Smalltalk or Objective-C, where types
402// are first-class objects themselves.
403//
404class SerializableClass
405{
406 public:
407
408 // Type CreateFunc is a pointer to a function that creates a new
409 // simulation object builder based on a .ini-file parameter
410 // section (specified by the first string argument), a unique name
411 // for the object (specified by the second string argument), and
412 // an optional config hierarchy node (specified by the third
413 // argument). A pointer to the new SerializableBuilder is returned.
414 typedef Serializable *(*CreateFunc)(CheckpointIn &cp,
415 const std::string §ion);
416
417 static std::map<std::string,CreateFunc> *classMap;
418
419 // Constructor. For example:
420 //
421 // SerializableClass baseCacheSerializableClass("BaseCacheSerializable",
422 // newBaseCacheSerializableBuilder);
423 //
424 SerializableClass(const std::string &className, CreateFunc createFunc);
425
426 // create Serializable given name of class and pointer to
427 // configuration hierarchy node
428 static Serializable *createObject(CheckpointIn &cp,
429 const std::string §ion);
430};
431
432//
433// Macros to encapsulate the magic of declaring & defining
434// SerializableBuilder and SerializableClass objects
435//
436
437#define REGISTER_SERIALIZEABLE(CLASS_NAME, OBJ_CLASS) \
438SerializableClass the##OBJ_CLASS##Class(CLASS_NAME, \
439 OBJ_CLASS::createForUnserialize);
440
441// Base class to wrap object resolving functionality. This can be
442// provided to Checkpoint to allow it to map object names onto
443// object C++ objects in which to unserialize
444class SimObjectResolver
445{
446 public:
447 virtual ~SimObjectResolver() { }
448
449 // Find a SimObject given a full path name
450 virtual SimObject *resolveSimObject(const std::string &name) = 0;
451};
452
453class CheckpointIn
454{
455 private:
456
457 IniFile *db;
458
459 SimObjectResolver &objNameResolver;
460
461 public:
462 CheckpointIn(const std::string &cpt_dir, SimObjectResolver &resolver);
463 ~CheckpointIn();
464
465 const std::string cptDir;
466
467 bool find(const std::string §ion, const std::string &entry,
468 std::string &value);
469
470 bool findObj(const std::string §ion, const std::string &entry,
471 SimObject *&value);
472
473 bool sectionExists(const std::string §ion);
474
475 // The following static functions have to do with checkpoint
476 // creation rather than restoration. This class makes a handy
477 // namespace for them though. Currently no Checkpoint object is
478 // created on serialization (only unserialization) so we track the
479 // directory name as a global. It would be nice to change this
480 // someday
481
482 private:
483 // current directory we're serializing into.
484 static std::string currentDirectory;
485
486 public:
487 // Set the current directory. This function takes care of
488 // inserting curTick() if there's a '%d' in the argument, and
489 // appends a '/' if necessary. The final name is returned.
490 static std::string setDir(const std::string &base_name);
491
492 // Export current checkpoint directory name so other objects can
493 // derive filenames from it (e.g., memory). The return value is
494 // guaranteed to end in '/' so filenames can be directly appended.
495 // This function is only valid while a checkpoint is being created.
496 static std::string dir();
497
498 // Filename for base checkpoint file within directory.
499 static const char *baseFilename;
500};
501
502#endif // __SERIALIZE_HH__
| 190#define SERIALIZE_OBJPTR(objptr) paramOut(cp, #objptr, (objptr)->name())
191
192#define UNSERIALIZE_OBJPTR(objptr) \
193 do { \
194 SimObject *sptr; \
195 objParamIn(cp, #objptr, sptr); \
196 fromSimObject(objptr, sptr); \
197 } while (0)
198
199/**
200 * Basic support for object serialization.
201 *
202 * Objects that support serialization should derive from this
203 * class. Such objects can largely be divided into two categories: 1)
204 * True SimObjects (deriving from SimObject), and 2) child objects
205 * (non-SimObjects).
206 *
207 * SimObjects are serialized automatically into their own sections
208 * automatically by the SimObject base class (see
209 * SimObject::serializeAll().
210 *
211 * SimObjects can contain other serializable objects that are not
212 * SimObjects. Much like normal serialized members are not serialized
213 * automatically, these objects will not be serialized automatically
214 * and it is expected that the objects owning such serializable
215 * objects call the required serialization/unserialization methods on
216 * child objects. The preferred method to serialize a child object is
217 * to call serializeSection() on the child, which serializes the
218 * object into a new subsection in the current section. Another option
219 * is to call serialize() directly, which serializes the object into
220 * the current section. The latter is not recommended as it can lead
221 * to naming clashes between objects.
222 *
223 * @note Many objects that support serialization need to be put in a
224 * consistent state when serialization takes place. We refer to the
225 * action of forcing an object into a consistent state as
226 * 'draining'. Objects that need draining inherit from Drainable. See
227 * Drainable for more information.
228 */
229class Serializable
230{
231 protected:
232 /**
233 * Scoped checkpoint section helper class
234 *
235 * This helper class creates a section within a checkpoint without
236 * the need for a separate serializeable object. It is mainly used
237 * within the Serializable class when serializing or unserializing
238 * section (see serializeSection() and unserializeSection()). It
239 * can also be used to maintain backwards compatibility in
240 * existing code that serializes structs that are not inheriting
241 * from Serializable into subsections.
242 *
243 * When the class is instantiated, it appends a name to the active
244 * path in a checkpoint. The old path is later restored when the
245 * instance is destroyed. For example, serializeSection() could be
246 * implemented by instantiating a ScopedCheckpointSection and then
247 * calling serialize() on an object.
248 */
249 class ScopedCheckpointSection {
250 public:
251 template<class CP>
252 ScopedCheckpointSection(CP &cp, const char *name) {
253 pushName(name);
254 nameOut(cp);
255 }
256
257 template<class CP>
258 ScopedCheckpointSection(CP &cp, const std::string &name) {
259 pushName(name.c_str());
260 nameOut(cp);
261 }
262
263 ~ScopedCheckpointSection();
264
265 ScopedCheckpointSection() = delete;
266 ScopedCheckpointSection(const ScopedCheckpointSection &) = delete;
267 ScopedCheckpointSection &operator=(
268 const ScopedCheckpointSection &) = delete;
269 ScopedCheckpointSection &operator=(
270 ScopedCheckpointSection &&) = delete;
271
272 private:
273 void pushName(const char *name);
274 void nameOut(CheckpointOut &cp);
275 void nameOut(CheckpointIn &cp) {};
276 };
277
278 public:
279 Serializable();
280 virtual ~Serializable();
281
282 /**
283 * Serialize an object
284 *
285 * Output an object's state into the current checkpoint section.
286 *
287 * @param cp Checkpoint state
288 */
289 virtual void serialize(CheckpointOut &cp) const = 0;
290
291 /**
292 * Unserialize an object
293 *
294 * Read an object's state from the current checkpoint section.
295 *
296 * @param cp Checkpoint state
297 */
298 virtual void unserialize(CheckpointIn &cp) = 0;
299
300 /**
301 * Serialize an object into a new section
302 *
303 * This method creates a new section in a checkpoint and calls
304 * serialize() to serialize the current object into that
305 * section. The name of the section is appended to the current
306 * checkpoint path.
307 *
308 * @param cp Checkpoint state
309 * @param name Name to append to the active path
310 */
311 void serializeSection(CheckpointOut &cp, const char *name) const;
312
313 void serializeSection(CheckpointOut &cp, const std::string &name) const {
314 serializeSection(cp, name.c_str());
315 }
316
317 /**
318 * Unserialize an a child object
319 *
320 * This method loads a child object from a checkpoint. The object
321 * name is appended to the active path to form a fully qualified
322 * section name and unserialize() is called.
323 *
324 * @param cp Checkpoint state
325 * @param name Name to append to the active path
326 */
327 void unserializeSection(CheckpointIn &cp, const char *name);
328
329 void unserializeSection(CheckpointIn &cp, const std::string &name) {
330 unserializeSection(cp, name.c_str());
331 }
332
333 /**
334 * @{
335 * @name Legacy interface
336 *
337 * Interface for objects that insist on changing their state when
338 * serializing. Such state change should be done in drain(),
339 * memWriteback(), or memInvalidate() and not in the serialization
340 * method. In general, if state changes occur in serialize, it
341 * complicates testing since it breaks assumptions about draining
342 * and serialization. It potentially also makes components more
343 * fragile since they there are no ordering guarantees when
344 * serializing SimObjects.
345 *
346 * @warn This interface is considered deprecated and should never
347 * be used.
348 */
349
350 virtual void serializeOld(CheckpointOut &cp) {
351 serialize(cp);
352 }
353 void serializeSectionOld(CheckpointOut &cp, const char *name);
354 void serializeSectionOld(CheckpointOut &cp, const std::string &name) {
355 serializeSectionOld(cp, name.c_str());
356 }
357 /** @} */
358
359 /** Get the fully-qualified name of the active section */
360 static const std::string ¤tSection();
361
362 static Serializable *create(CheckpointIn &cp, const std::string §ion);
363
364 static int ckptCount;
365 static int ckptMaxCount;
366 static int ckptPrevCount;
367 static void serializeAll(const std::string &cpt_dir);
368 static void unserializeGlobals(CheckpointIn &cp);
369
370 private:
371 static std::stack<std::string> path;
372};
373
374void debug_serialize(const std::string &cpt_dir);
375
376//
377// A SerializableBuilder serves as an evaluation context for a set of
378// parameters that describe a specific instance of a Serializable. This
379// evaluation context corresponds to a section in the .ini file (as
380// with the base ParamContext) plus an optional node in the
381// configuration hierarchy (the configNode member) for resolving
382// Serializable references. SerializableBuilder is an abstract superclass;
383// derived classes specialize the class for particular subclasses of
384// Serializable (e.g., BaseCache).
385//
386// For typical usage, see the definition of
387// SerializableClass::createObject().
388//
389class SerializableBuilder
390{
391 public:
392
393 SerializableBuilder() {}
394
395 virtual ~SerializableBuilder() {}
396
397 // Create the actual Serializable corresponding to the parameter
398 // values in this context. This function is overridden in derived
399 // classes to call a specific constructor for a particular
400 // subclass of Serializable.
401 virtual Serializable *create() = 0;
402};
403
404//
405// An instance of SerializableClass corresponds to a class derived from
406// Serializable. The SerializableClass instance serves to bind the string
407// name (found in the config file) to a function that creates an
408// instance of the appropriate derived class.
409//
410// This would be much cleaner in Smalltalk or Objective-C, where types
411// are first-class objects themselves.
412//
413class SerializableClass
414{
415 public:
416
417 // Type CreateFunc is a pointer to a function that creates a new
418 // simulation object builder based on a .ini-file parameter
419 // section (specified by the first string argument), a unique name
420 // for the object (specified by the second string argument), and
421 // an optional config hierarchy node (specified by the third
422 // argument). A pointer to the new SerializableBuilder is returned.
423 typedef Serializable *(*CreateFunc)(CheckpointIn &cp,
424 const std::string §ion);
425
426 static std::map<std::string,CreateFunc> *classMap;
427
428 // Constructor. For example:
429 //
430 // SerializableClass baseCacheSerializableClass("BaseCacheSerializable",
431 // newBaseCacheSerializableBuilder);
432 //
433 SerializableClass(const std::string &className, CreateFunc createFunc);
434
435 // create Serializable given name of class and pointer to
436 // configuration hierarchy node
437 static Serializable *createObject(CheckpointIn &cp,
438 const std::string §ion);
439};
440
441//
442// Macros to encapsulate the magic of declaring & defining
443// SerializableBuilder and SerializableClass objects
444//
445
446#define REGISTER_SERIALIZEABLE(CLASS_NAME, OBJ_CLASS) \
447SerializableClass the##OBJ_CLASS##Class(CLASS_NAME, \
448 OBJ_CLASS::createForUnserialize);
449
450// Base class to wrap object resolving functionality. This can be
451// provided to Checkpoint to allow it to map object names onto
452// object C++ objects in which to unserialize
453class SimObjectResolver
454{
455 public:
456 virtual ~SimObjectResolver() { }
457
458 // Find a SimObject given a full path name
459 virtual SimObject *resolveSimObject(const std::string &name) = 0;
460};
461
462class CheckpointIn
463{
464 private:
465
466 IniFile *db;
467
468 SimObjectResolver &objNameResolver;
469
470 public:
471 CheckpointIn(const std::string &cpt_dir, SimObjectResolver &resolver);
472 ~CheckpointIn();
473
474 const std::string cptDir;
475
476 bool find(const std::string §ion, const std::string &entry,
477 std::string &value);
478
479 bool findObj(const std::string §ion, const std::string &entry,
480 SimObject *&value);
481
482 bool sectionExists(const std::string §ion);
483
484 // The following static functions have to do with checkpoint
485 // creation rather than restoration. This class makes a handy
486 // namespace for them though. Currently no Checkpoint object is
487 // created on serialization (only unserialization) so we track the
488 // directory name as a global. It would be nice to change this
489 // someday
490
491 private:
492 // current directory we're serializing into.
493 static std::string currentDirectory;
494
495 public:
496 // Set the current directory. This function takes care of
497 // inserting curTick() if there's a '%d' in the argument, and
498 // appends a '/' if necessary. The final name is returned.
499 static std::string setDir(const std::string &base_name);
500
501 // Export current checkpoint directory name so other objects can
502 // derive filenames from it (e.g., memory). The return value is
503 // guaranteed to end in '/' so filenames can be directly appended.
504 // This function is only valid while a checkpoint is being created.
505 static std::string dir();
506
507 // Filename for base checkpoint file within directory.
508 static const char *baseFilename;
509};
510
511#endif // __SERIALIZE_HH__
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