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GCC Code Coverage Report

Directory:	.		Exec	Total	Coverage
File:	src/smt/smt_engine_state.cpp	Lines:	126	141	89.4 %
Date:	2021-05-24	Branches:	92	253	36.4 %


/******************************************************************************
 * Top contributors (to current version):
 *   Andrew Reynolds, Morgan Deters, Ying Sheng
 *
 * This file is part of the cvc5 project.
 *
 * Copyright (c) 2009-2021 by the authors listed in the file AUTHORS
 * in the top-level source directory and their institutional affiliations.
 * All rights reserved.  See the file COPYING in the top-level source
 * directory for licensing information.
 * ****************************************************************************
 *
 * Utility for maintaining the state of the SMT engine.
 */

#include "smt/smt_engine_state.h"

#include "base/modal_exception.h"
#include "options/option_exception.h"
#include "options/smt_options.h"
#include "smt/smt_engine.h"

namespace cvc5 {
namespace smt {

SmtEngineState::SmtEngineState(context::Context* c,
                               context::UserContext* u,
                               SmtEngine& smt)
    : d_smt(smt),
      d_context(c),
      d_userContext(u),
      d_pendingPops(0),
      d_fullyInited(false),
      d_queryMade(false),
      d_needPostsolve(false),
      d_status(),
      d_expectedStatus(),
      d_smtMode(SmtMode::START)
{
}

void SmtEngineState::notifyExpectedStatus(const std::string& status)
{
  Assert(status == "sat" || status == "unsat" || status == "unknown")
      << "SmtEngineState::notifyExpectedStatus: unexpected status string "
      << status;
  d_expectedStatus = Result(status, d_filename);
}

void SmtEngineState::notifyResetAssertions()
{
  doPendingPops();
  while (!d_userLevels.empty())
  {
    userPop();
  }
  // Remember the global push/pop around everything when beyond Start mode
  // (see solver execution modes in the SMT-LIB standard)
  Assert(d_userLevels.size() == 0 && d_userContext->getLevel() == 1);
  popto(0);
}

void SmtEngineState::notifyCheckSat(bool hasAssumptions)
{
  // process the pending pops
  doPendingPops();
  if (d_queryMade && !options::incrementalSolving())
  {
    throw ModalException(
        "Cannot make multiple queries unless "
        "incremental solving is enabled "
        "(try --incremental)");
  }

  // Note that a query has been made and we are in assert mode
  d_queryMade = true;
  d_smtMode = SmtMode::ASSERT;

  // push if there are assumptions
  if (hasAssumptions)
  {
    internalPush();
  }
}

void SmtEngineState::notifyCheckSatResult(bool hasAssumptions, Result r)
{
  d_needPostsolve = true;

  // Pop the context
  if (hasAssumptions)
  {
    internalPop();
  }

  // Remember the status
  d_status = r;
  // Check against expected status
  if (!d_expectedStatus.isUnknown() && !d_status.isUnknown()
      && d_status != d_expectedStatus)
  {
    CVC5_FATAL() << "Expected result " << d_expectedStatus << " but got "
                 << d_status;
  }
  // clear expected status
  d_expectedStatus = Result();
  // Update the SMT mode
  switch (d_status.asSatisfiabilityResult().isSat())
  {
    case Result::UNSAT: d_smtMode = SmtMode::UNSAT; break;
    case Result::SAT: d_smtMode = SmtMode::SAT; break;
    default: d_smtMode = SmtMode::SAT_UNKNOWN;
  }
}

void SmtEngineState::notifyGetAbduct(bool success)
{
  if (success)
  {
    // successfully generated an abduct, update to abduct state
    d_smtMode = SmtMode::ABDUCT;
  }
  else
  {
    // failed, we revert to the assert state
    d_smtMode = SmtMode::ASSERT;
  }
}

void SmtEngineState::notifyGetInterpol(bool success)
{
  if (success)
  {
    // successfully generated an interpolant, update to interpol state
    d_smtMode = SmtMode::INTERPOL;
  }
  else
  {
    // failed, we revert to the assert state
    d_smtMode = SmtMode::ASSERT;
  }
}

void SmtEngineState::setup()
{
  // push a context
  push();
}

void SmtEngineState::finishInit()
{
  // set the flag to remember that we are fully initialized
  d_fullyInited = true;
}

void SmtEngineState::shutdown()
{
  doPendingPops();

  while (options::incrementalSolving() && d_userContext->getLevel() > 1)
  {
    internalPop(true);
  }
}

void SmtEngineState::cleanup()
{
  // pop to level zero
  popto(0);
}

void SmtEngineState::setFilename(const std::string& filename)
{
  d_filename = filename;
}

void SmtEngineState::userPush()
{
  if (!options::incrementalSolving())
  {
    throw ModalException(
        "Cannot push when not solving incrementally (use --incremental)");
  }
  // The problem isn't really "extended" yet, but this disallows
  // get-model after a push, simplifying our lives somewhat and
  // staying symmetric with pop.
  d_smtMode = SmtMode::ASSERT;

  d_userLevels.push_back(d_userContext->getLevel());
  internalPush();
  Trace("userpushpop") << "SmtEngineState: pushed to level "
                       << d_userContext->getLevel() << std::endl;
}

void SmtEngineState::userPop()
{
  if (!options::incrementalSolving())
  {
    throw ModalException(
        "Cannot pop when not solving incrementally (use --incremental)");
  }
  if (d_userLevels.size() == 0)
  {
    throw ModalException("Cannot pop beyond the first user frame");
  }
  // The problem isn't really "extended" yet, but this disallows
  // get-model after a pop, simplifying our lives somewhat.  It might
  // not be strictly necessary to do so, since the pops occur lazily,
  // but also it would be weird to have a legally-executed (get-model)
  // that only returns a subset of the assignment (because the rest
  // is no longer in scope!).
  d_smtMode = SmtMode::ASSERT;

  AlwaysAssert(d_userContext->getLevel() > 0);
  AlwaysAssert(d_userLevels.back() < d_userContext->getLevel());
  while (d_userLevels.back() < d_userContext->getLevel())
  {
    internalPop(true);
  }
  d_userLevels.pop_back();
}

void SmtEngineState::push()
{
  d_userContext->push();
  d_context->push();
}

void SmtEngineState::pop()
{
  d_userContext->pop();
  d_context->pop();
}

void SmtEngineState::popto(int toLevel)
{
  d_context->popto(toLevel);
  d_userContext->popto(toLevel);
}

context::UserContext* SmtEngineState::getUserContext() { return d_userContext; }

context::Context* SmtEngineState::getContext() { return d_context; }

Result SmtEngineState::getStatus() const { return d_status; }

bool SmtEngineState::isFullyInited() const { return d_fullyInited; }
bool SmtEngineState::isFullyReady() const
{
  return d_fullyInited && d_pendingPops == 0;
}
bool SmtEngineState::isQueryMade() const { return d_queryMade; }
size_t SmtEngineState::getNumUserLevels() const { return d_userLevels.size(); }

SmtMode SmtEngineState::getMode() const { return d_smtMode; }

const std::string& SmtEngineState::getFilename() const { return d_filename; }

void SmtEngineState::internalPush()
{
  Assert(d_fullyInited);
  Trace("smt") << "SmtEngineState::internalPush()" << std::endl;
  doPendingPops();
  if (options::incrementalSolving())
  {
    // notifies the SmtEngine to process the assertions immediately
    d_smt.notifyPushPre();
    d_userContext->push();
    // the context push is done inside of the SAT solver
    d_smt.notifyPushPost();
  }
}

void SmtEngineState::internalPop(bool immediate)
{
  Assert(d_fullyInited);
  Trace("smt") << "SmtEngineState::internalPop()" << std::endl;
  if (options::incrementalSolving())
  {
    ++d_pendingPops;
  }
  if (immediate)
  {
    doPendingPops();
  }
}

void SmtEngineState::doPendingPops()
{
  Trace("smt") << "SmtEngineState::doPendingPops()" << std::endl;
  Assert(d_pendingPops == 0 || options::incrementalSolving());
  // check to see if a postsolve() is pending
  if (d_needPostsolve)
  {
    d_smt.notifyPostSolvePre();
  }
  while (d_pendingPops > 0)
  {
    // the context pop is done inside of the SAT solver
    d_smt.notifyPopPre();
    // pop the context
    d_userContext->pop();
    --d_pendingPops;
    // no need for pop post (for now)
  }
  if (d_needPostsolve)
  {
    d_smt.notifyPostSolvePost();
    d_needPostsolve = false;
  }
}

}  // namespace smt
}  // namespace cvc5


Generated by: GCOVR (Version 3.2)

Line	Exec	Source
1		/******************************************************************************
2		* Top contributors (to current version):
3		* Andrew Reynolds, Morgan Deters, Ying Sheng
4		*
5		* This file is part of the cvc5 project.
6		*
7		* Copyright (c) 2009-2021 by the authors listed in the file AUTHORS
8		* in the top-level source directory and their institutional affiliations.
9		* All rights reserved. See the file COPYING in the top-level source
10		* directory for licensing information.
11		* ****************************************************************************
12		*
13		* Utility for maintaining the state of the SMT engine.
14		*/
15
16		#include "smt/smt_engine_state.h"
17
18		#include "base/modal_exception.h"
19		#include "options/option_exception.h"
20		#include "options/smt_options.h"
21		#include "smt/smt_engine.h"
22
23		namespace cvc5 {
24		namespace smt {
25
26	10093	SmtEngineState::SmtEngineState(context::Context* c,
27		context::UserContext* u,
28	10093	SmtEngine& smt)
29		: d_smt(smt),
30		d_context(c),
31		d_userContext(u),
32		d_pendingPops(0),
33		d_fullyInited(false),
34		d_queryMade(false),
35		d_needPostsolve(false),
36		d_status(),
37		d_expectedStatus(),
38	10093	d_smtMode(SmtMode::START)
39		{
40	10093	}
41
42	3500	void SmtEngineState::notifyExpectedStatus(const std::string& status)
43		{
44	3500	Assert(status == "sat" \|\| status == "unsat" \|\| status == "unknown")
45		<< "SmtEngineState::notifyExpectedStatus: unexpected status string "
46		<< status;
47	3500	d_expectedStatus = Result(status, d_filename);
48	3500	}
49
50	35	void SmtEngineState::notifyResetAssertions()
51		{
52	35	doPendingPops();
53	67	while (!d_userLevels.empty())
54		{
55	16	userPop();
56		}
57		// Remember the global push/pop around everything when beyond Start mode
58		// (see solver execution modes in the SMT-LIB standard)
59	35	Assert(d_userLevels.size() == 0 && d_userContext->getLevel() == 1);
60	35	popto(0);
61	35	}
62
63	14323	void SmtEngineState::notifyCheckSat(bool hasAssumptions)
64		{
65		// process the pending pops
66	14323	doPendingPops();
67	14323	if (d_queryMade && !options::incrementalSolving())
68		{
69		throw ModalException(
70		"Cannot make multiple queries unless "
71		"incremental solving is enabled "
72		"(try --incremental)");
73		}
74
75		// Note that a query has been made and we are in assert mode
76	14323	d_queryMade = true;
77	14323	d_smtMode = SmtMode::ASSERT;
78
79		// push if there are assumptions
80	14323	if (hasAssumptions)
81		{
82	2450	internalPush();
83		}
84	14323	}
85
86	14294	void SmtEngineState::notifyCheckSatResult(bool hasAssumptions, Result r)
87		{
88	14294	d_needPostsolve = true;
89
90		// Pop the context
91	14294	if (hasAssumptions)
92		{
93	2436	internalPop();
94		}
95
96		// Remember the status
97	14294	d_status = r;
98		// Check against expected status
99	32024	if (!d_expectedStatus.isUnknown() && !d_status.isUnknown()
100	17727	&& d_status != d_expectedStatus)
101		{
102		CVC5_FATAL() << "Expected result " << d_expectedStatus << " but got "
103		<< d_status;
104		}
105		// clear expected status
106	14294	d_expectedStatus = Result();
107		// Update the SMT mode
108	14294	switch (d_status.asSatisfiabilityResult().isSat())
109		{
110	7292	case Result::UNSAT: d_smtMode = SmtMode::UNSAT; break;
111	6907	case Result::SAT: d_smtMode = SmtMode::SAT; break;
112	95	default: d_smtMode = SmtMode::SAT_UNKNOWN;
113		}
114	14294	}
115
116	13	void SmtEngineState::notifyGetAbduct(bool success)
117		{
118	13	if (success)
119		{
120		// successfully generated an abduct, update to abduct state
121	13	d_smtMode = SmtMode::ABDUCT;
122		}
123		else
124		{
125		// failed, we revert to the assert state
126		d_smtMode = SmtMode::ASSERT;
127		}
128	13	}
129
130	10	void SmtEngineState::notifyGetInterpol(bool success)
131		{
132	10	if (success)
133		{
134		// successfully generated an interpolant, update to interpol state
135	10	d_smtMode = SmtMode::INTERPOL;
136		}
137		else
138		{
139		// failed, we revert to the assert state
140		d_smtMode = SmtMode::ASSERT;
141		}
142	10	}
143
144	9494	void SmtEngineState::setup()
145		{
146		// push a context
147	9494	push();
148	9494	}
149
150	9459	void SmtEngineState::finishInit()
151		{
152		// set the flag to remember that we are fully initialized
153	9459	d_fullyInited = true;
154	9459	}
155
156	10092	void SmtEngineState::shutdown()
157		{
158	10092	doPendingPops();
159
160	11128	while (options::incrementalSolving() && d_userContext->getLevel() > 1)
161		{
162	518	internalPop(true);
163		}
164	10092	}
165
166	10092	void SmtEngineState::cleanup()
167		{
168		// pop to level zero
169	10092	popto(0);
170	10092	}
171
172	5933	void SmtEngineState::setFilename(const std::string& filename)
173		{
174	5933	d_filename = filename;
175	5933	}
176
177	3534	void SmtEngineState::userPush()
178		{
179	3534	if (!options::incrementalSolving())
180		{
181		throw ModalException(
182		"Cannot push when not solving incrementally (use --incremental)");
183		}
184		// The problem isn't really "extended" yet, but this disallows
185		// get-model after a push, simplifying our lives somewhat and
186		// staying symmetric with pop.
187	3534	d_smtMode = SmtMode::ASSERT;
188
189	3534	d_userLevels.push_back(d_userContext->getLevel());
190	3534	internalPush();
191	7068	Trace("userpushpop") << "SmtEngineState: pushed to level "
192	3534	<< d_userContext->getLevel() << std::endl;
193	3534	}
194
195	3016	void SmtEngineState::userPop()
196		{
197	3016	if (!options::incrementalSolving())
198		{
199		throw ModalException(
200		"Cannot pop when not solving incrementally (use --incremental)");
201		}
202	3016	if (d_userLevels.size() == 0)
203		{
204		throw ModalException("Cannot pop beyond the first user frame");
205		}
206		// The problem isn't really "extended" yet, but this disallows
207		// get-model after a pop, simplifying our lives somewhat. It might
208		// not be strictly necessary to do so, since the pops occur lazily,
209		// but also it would be weird to have a legally-executed (get-model)
210		// that only returns a subset of the assignment (because the rest
211		// is no longer in scope!).
212	3016	d_smtMode = SmtMode::ASSERT;
213
214	3016	AlwaysAssert(d_userContext->getLevel() > 0);
215	3016	AlwaysAssert(d_userLevels.back() < d_userContext->getLevel());
216	9048	while (d_userLevels.back() < d_userContext->getLevel())
217		{
218	3016	internalPop(true);
219		}
220	3016	d_userLevels.pop_back();
221	3016	}
222
223	9494	void SmtEngineState::push()
224		{
225	9494	d_userContext->push();
226	9494	d_context->push();
227	9494	}
228
229		void SmtEngineState::pop()
230		{
231		d_userContext->pop();
232		d_context->pop();
233		}
234
235	10127	void SmtEngineState::popto(int toLevel)
236		{
237	10127	d_context->popto(toLevel);
238	10127	d_userContext->popto(toLevel);
239	10127	}
240
241		context::UserContext* SmtEngineState::getUserContext() { return d_userContext; }
242
243		context::Context* SmtEngineState::getContext() { return d_context; }
244
245	11	Result SmtEngineState::getStatus() const { return d_status; }
246
247	252515	bool SmtEngineState::isFullyInited() const { return d_fullyInited; }
248	22286	bool SmtEngineState::isFullyReady() const
249		{
250	22286	return d_fullyInited && d_pendingPops == 0;
251		}
252	10603	bool SmtEngineState::isQueryMade() const { return d_queryMade; }
253	2752	size_t SmtEngineState::getNumUserLevels() const { return d_userLevels.size(); }
254
255	5790	SmtMode SmtEngineState::getMode() const { return d_smtMode; }
256
257	103414	const std::string& SmtEngineState::getFilename() const { return d_filename; }
258
259	5984	void SmtEngineState::internalPush()
260		{
261	5984	Assert(d_fullyInited);
262	5984	Trace("smt") << "SmtEngineState::internalPush()" << std::endl;
263	5984	doPendingPops();
264	5984	if (options::incrementalSolving())
265		{
266		// notifies the SmtEngine to process the assertions immediately
267	4361	d_smt.notifyPushPre();
268	4361	d_userContext->push();
269		// the context push is done inside of the SAT solver
270	4361	d_smt.notifyPushPost();
271		}
272	5984	}
273
274	5970	void SmtEngineState::internalPop(bool immediate)
275		{
276	5970	Assert(d_fullyInited);
277	5970	Trace("smt") << "SmtEngineState::internalPop()" << std::endl;
278	5970	if (options::incrementalSolving())
279		{
280	4361	++d_pendingPops;
281		}
282	5970	if (immediate)
283		{
284	3534	doPendingPops();
285		}
286	5970	}
287
288	131230	void SmtEngineState::doPendingPops()
289		{
290	131230	Trace("smt") << "SmtEngineState::doPendingPops()" << std::endl;
291	131230	Assert(d_pendingPops == 0 \|\| options::incrementalSolving());
292		// check to see if a postsolve() is pending
293	131230	if (d_needPostsolve)
294		{
295	14294	d_smt.notifyPostSolvePre();
296		}
297	139952	while (d_pendingPops > 0)
298		{
299		// the context pop is done inside of the SAT solver
300	4361	d_smt.notifyPopPre();
301		// pop the context
302	4361	d_userContext->pop();
303	4361	--d_pendingPops;
304		// no need for pop post (for now)
305		}
306	131230	if (d_needPostsolve)
307		{
308	14294	d_smt.notifyPostSolvePost();
309	14294	d_needPostsolve = false;
310		}
311	131230	}
312
313		} // namespace smt
314	28191	} // namespace cvc5