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GCC Code Coverage Report

Directory:	.		Exec	Total	Coverage
File:	src/smt/smt_engine_state.cpp	Lines:	124	137	90.5 %
Date:	2021-09-10	Branches:	93	251	37.1 %


/******************************************************************************
 * 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/base_options.h"
#include "options/main_options.h"
#include "options/option_exception.h"
#include "options/smt_options.h"
#include "smt/env.h"
#include "smt/smt_engine.h"

namespace cvc5 {
namespace smt {

SmtEngineState::SmtEngineState(Env& env, SmtEngine& smt)
    : d_smt(smt),
      d_env(env),
      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_env.getOptions().driver.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 && getUserContext()->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() && getUserContext()->getLevel() > 1)
  {
    internalPop(true);
  }
}

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

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(getUserContext()->getLevel());
  internalPush();
  Trace("userpushpop") << "SmtEngineState: pushed to level "
                       << getUserContext()->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(getUserContext()->getLevel() > 0);
  AlwaysAssert(d_userLevels.back() < getUserContext()->getLevel());
  while (d_userLevels.back() < getUserContext()->getLevel())
  {
    internalPop(true);
  }
  d_userLevels.pop_back();
}
context::Context* SmtEngineState::getContext() { return d_env.getContext(); }
context::UserContext* SmtEngineState::getUserContext()
{
  return d_env.getUserContext();
}
void SmtEngineState::push()
{
  getUserContext()->push();
  getContext()->push();
}

void SmtEngineState::pop()
{
  getUserContext()->pop();
  getContext()->pop();
}

void SmtEngineState::popto(int toLevel)
{
  getContext()->popto(toLevel);
  getUserContext()->popto(toLevel);
}

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; }

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();
    getUserContext()->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
    getUserContext()->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/base_options.h"
20		#include "options/main_options.h"
21		#include "options/option_exception.h"
22		#include "options/smt_options.h"
23		#include "smt/env.h"
24		#include "smt/smt_engine.h"
25
26		namespace cvc5 {
27		namespace smt {
28
29	13170	SmtEngineState::SmtEngineState(Env& env, SmtEngine& smt)
30		: d_smt(smt),
31		d_env(env),
32		d_pendingPops(0),
33		d_fullyInited(false),
34		d_queryMade(false),
35		d_needPostsolve(false),
36		d_status(),
37		d_expectedStatus(),
38	13170	d_smtMode(SmtMode::START)
39		{
40	13170	}
41
42	3684	void SmtEngineState::notifyExpectedStatus(const std::string& status)
43		{
44	3684	Assert(status == "sat" \|\| status == "unsat" \|\| status == "unknown")
45		<< "SmtEngineState::notifyExpectedStatus: unexpected status string "
46		<< status;
47	3684	d_expectedStatus = Result(status, d_env.getOptions().driver.filename);
48	3684	}
49
50	67	void SmtEngineState::notifyResetAssertions()
51		{
52	67	doPendingPops();
53	99	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	67	Assert(d_userLevels.size() == 0 && getUserContext()->getLevel() == 1);
60	67	popto(0);
61	67	}
62
63	15251	void SmtEngineState::notifyCheckSat(bool hasAssumptions)
64		{
65		// process the pending pops
66	15251	doPendingPops();
67	15251	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	15251	d_queryMade = true;
77	15251	d_smtMode = SmtMode::ASSERT;
78
79		// push if there are assumptions
80	15251	if (hasAssumptions)
81		{
82	2452	internalPush();
83		}
84	15251	}
85
86	15221	void SmtEngineState::notifyCheckSatResult(bool hasAssumptions, Result r)
87		{
88	15221	d_needPostsolve = true;
89
90		// Pop the context
91	15221	if (hasAssumptions)
92		{
93	2438	internalPop();
94		}
95
96		// Remember the status
97	15221	d_status = r;
98		// Check against expected status
99	34062	if (!d_expectedStatus.isUnknown() && !d_status.isUnknown()
100	18838	&& d_status != d_expectedStatus)
101		{
102		CVC5_FATAL() << "Expected result " << d_expectedStatus << " but got "
103		<< d_status;
104		}
105		// clear expected status
106	15221	d_expectedStatus = Result();
107		// Update the SMT mode
108	15221	switch (d_status.asSatisfiabilityResult().isSat())
109		{
110	7732	case Result::UNSAT: d_smtMode = SmtMode::UNSAT; break;
111	7370	case Result::SAT: d_smtMode = SmtMode::SAT; break;
112	119	default: d_smtMode = SmtMode::SAT_UNKNOWN;
113		}
114	15221	}
115
116	14	void SmtEngineState::notifyGetAbduct(bool success)
117		{
118	14	if (success)
119		{
120		// successfully generated an abduct, update to abduct state
121	14	d_smtMode = SmtMode::ABDUCT;
122		}
123		else
124		{
125		// failed, we revert to the assert state
126		d_smtMode = SmtMode::ASSERT;
127		}
128	14	}
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	9980	void SmtEngineState::setup()
145		{
146		// push a context
147	9980	push();
148	9980	}
149
150	9913	void SmtEngineState::finishInit()
151		{
152		// set the flag to remember that we are fully initialized
153	9913	d_fullyInited = true;
154	9913	}
155
156	10529	void SmtEngineState::shutdown()
157		{
158	10529	doPendingPops();
159
160	11575	while (options::incrementalSolving() && getUserContext()->getLevel() > 1)
161		{
162	523	internalPop(true);
163		}
164	10529	}
165
166	10529	void SmtEngineState::cleanup()
167		{
168		// pop to level zero
169	10529	popto(0);
170	10529	}
171
172	4036	void SmtEngineState::userPush()
173		{
174	4036	if (!options::incrementalSolving())
175		{
176		throw ModalException(
177		"Cannot push when not solving incrementally (use --incremental)");
178		}
179		// The problem isn't really "extended" yet, but this disallows
180		// get-model after a push, simplifying our lives somewhat and
181		// staying symmetric with pop.
182	4036	d_smtMode = SmtMode::ASSERT;
183
184	4036	d_userLevels.push_back(getUserContext()->getLevel());
185	4036	internalPush();
186	8072	Trace("userpushpop") << "SmtEngineState: pushed to level "
187	4036	<< getUserContext()->getLevel() << std::endl;
188	4036	}
189
190	3513	void SmtEngineState::userPop()
191		{
192	3513	if (!options::incrementalSolving())
193		{
194		throw ModalException(
195		"Cannot pop when not solving incrementally (use --incremental)");
196		}
197	3513	if (d_userLevels.size() == 0)
198		{
199		throw ModalException("Cannot pop beyond the first user frame");
200		}
201		// The problem isn't really "extended" yet, but this disallows
202		// get-model after a pop, simplifying our lives somewhat. It might
203		// not be strictly necessary to do so, since the pops occur lazily,
204		// but also it would be weird to have a legally-executed (get-model)
205		// that only returns a subset of the assignment (because the rest
206		// is no longer in scope!).
207	3513	d_smtMode = SmtMode::ASSERT;
208
209	3513	AlwaysAssert(getUserContext()->getLevel() > 0);
210	3513	AlwaysAssert(d_userLevels.back() < getUserContext()->getLevel());
211	10539	while (d_userLevels.back() < getUserContext()->getLevel())
212		{
213	3513	internalPop(true);
214		}
215	3513	d_userLevels.pop_back();
216	3513	}
217	20576	context::Context* SmtEngineState::getContext() { return d_env.getContext(); }
218	55836	context::UserContext* SmtEngineState::getUserContext()
219		{
220	55836	return d_env.getUserContext();
221		}
222	9980	void SmtEngineState::push()
223		{
224	9980	getUserContext()->push();
225	9980	getContext()->push();
226	9980	}
227
228		void SmtEngineState::pop()
229		{
230		getUserContext()->pop();
231		getContext()->pop();
232		}
233
234	10596	void SmtEngineState::popto(int toLevel)
235		{
236	10596	getContext()->popto(toLevel);
237	10596	getUserContext()->popto(toLevel);
238	10596	}
239
240	11	Result SmtEngineState::getStatus() const { return d_status; }
241
242	269273	bool SmtEngineState::isFullyInited() const { return d_fullyInited; }
243	24224	bool SmtEngineState::isFullyReady() const
244		{
245	24224	return d_fullyInited && d_pendingPops == 0;
246		}
247	10987	bool SmtEngineState::isQueryMade() const { return d_queryMade; }
248	2825	size_t SmtEngineState::getNumUserLevels() const { return d_userLevels.size(); }
249
250	6521	SmtMode SmtEngineState::getMode() const { return d_smtMode; }
251
252	6488	void SmtEngineState::internalPush()
253		{
254	6488	Assert(d_fullyInited);
255	6488	Trace("smt") << "SmtEngineState::internalPush()" << std::endl;
256	6488	doPendingPops();
257	6488	if (options::incrementalSolving())
258		{
259		// notifies the SmtEngine to process the assertions immediately
260	4869	d_smt.notifyPushPre();
261	4869	getUserContext()->push();
262		// the context push is done inside of the SAT solver
263	4869	d_smt.notifyPushPost();
264		}
265	6488	}
266
267	6474	void SmtEngineState::internalPop(bool immediate)
268		{
269	6474	Assert(d_fullyInited);
270	6474	Trace("smt") << "SmtEngineState::internalPop()" << std::endl;
271	6474	if (options::incrementalSolving())
272		{
273	4869	++d_pendingPops;
274		}
275	6474	if (immediate)
276		{
277	4036	doPendingPops();
278		}
279	6474	}
280
281	132452	void SmtEngineState::doPendingPops()
282		{
283	132452	Trace("smt") << "SmtEngineState::doPendingPops()" << std::endl;
284	132452	Assert(d_pendingPops == 0 \|\| options::incrementalSolving());
285		// check to see if a postsolve() is pending
286	132452	if (d_needPostsolve)
287		{
288	15221	d_smt.notifyPostSolvePre();
289		}
290	142190	while (d_pendingPops > 0)
291		{
292		// the context pop is done inside of the SAT solver
293	4869	d_smt.notifyPopPre();
294		// pop the context
295	4869	getUserContext()->pop();
296	4869	--d_pendingPops;
297		// no need for pop post (for now)
298		}
299	132452	if (d_needPostsolve)
300		{
301	15221	d_smt.notifyPostSolvePost();
302	15221	d_needPostsolve = false;
303		}
304	132452	}
305
306		} // namespace smt
307	29502	} // namespace cvc5