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Topi.cc
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// Copyright(C) 2021-2022 Intel Corporation
// SPDX - License - Identifier: MIT
#include <functional>
#include <string>
#include <bit>
#include <iterator>
#include <any>
#include <algorithm>
#include <numeric>
#include "Topi.hpp"
#include "SetInScope.h"
#include "Diamond.h"
#ifndef _WIN32
#include <unistd.h>
#else
#include <process.h>
#define getpid _getpid
#endif
using namespace Topor;
using namespace std;
template <typename TLit, typename TUInd, bool Compress>
void CTopi<TLit, TUInd, Compress>::DumpSetUp(const char* filePrefix)
{
assert(filePrefix != nullptr);
stringstream ss;
ss << filePrefix << "_";
time_t now;
time(&now);
struct tm* current = localtime(&now);
ss << (void*)this << '_' << getpid() << '_';
if (current != NULL)
{
ss << current->tm_mday << "." << (current->tm_mon + 1) << "." << 1900 + current->tm_year << '_' <<
current->tm_hour << "_" << current->tm_min << "_" << current->tm_sec;
}
ss << ".cnf";
m_DumpFile.reset(new std::ofstream(ss.str(), ofstream::out));
}
template <typename TLit, typename TUInd, bool Compress>
CTopi<TLit, TUInd, Compress>::CTopi(TLit varNumHint) : m_InitVarNumAlloc(varNumHint <= 0 ? InitEntriesInB : (size_t)varNumHint + 1), m_E2ILitMap(m_InitVarNumAlloc, (size_t)0),
m_HandleNewUserCls(m_InitVarNumAlloc), m_Watches(GetInitLitNumAlloc(), (size_t)0), m_TrailLastVarPerDecLevel(1, BadClsInd),
m_VarInfo(m_InitVarNumAlloc, (size_t)0),
m_Stat([&]() { return Compress ? m_BC.size() : 1; }, [&]() { return Compress ? BCCapacitySum() : m_B.cap(); }, [&]() { return Compress ? BCNextBitSum() / 64 + 1 : m_BNext; }, [&]() { return GetMemoryLayout(); }, m_ParamVarActivityInc), m_VsidsHeap(m_Stat.m_VarActivityInc)
{
m_AssignmentInfo.reserve_exactly(m_InitVarNumAlloc, (size_t)0);
static bool diamondInvokedTopor = false;
DIAMOND("topor", diamondInvokedTopor);
const char* fileName = getenv("TOPOR_DUMP_NAME");
if (fileName != NULL)
{
DumpSetUp(fileName);
assert(m_DumpFile);
if (m_DumpFile) (*m_DumpFile) << "p cnf " << varNumHint << " " << 0 << endl;
}
if (m_Params.IsError())
{
SetStatus(TToporStatus::STATUS_PARAM_ERROR, m_Params.GetErrorDescr());
}
else if (m_B.uninitialized_or_erroneous())
{
SetStatus(TToporStatus::STATUS_ALLOC_FAILED, "CTopi<TLit,TUInd,Compress>::CTopi: couldn't allocate the main buffer");
}
else if (m_InitVarNumAlloc != 0 && m_E2ILitMap.uninitialized_or_erroneous())
{
SetStatus(TToporStatus::STATUS_ALLOC_FAILED, "CTopi<TLit,TUInd,Compress>::CTopi: couldn't allocate m_E2IVarMap");
}
else if (GetInitLitNumAlloc() != 0 && m_Watches.uninitialized_or_erroneous())
{
SetStatus(TToporStatus::STATUS_ALLOC_FAILED, "CTopi<TLit,TUInd,Compress>::CTopi: couldn't allocate m_Watches");
}
else if (m_InitVarNumAlloc != 0 && m_AssignmentInfo.uninitialized_or_erroneous())
{
SetStatus(TToporStatus::STATUS_ALLOC_FAILED, "CTopi<TLit,TUInd,Compress>::CTopi: couldn't allocate m_AssignmentInfo");
}
else if (m_InitVarNumAlloc != 0 && m_VarInfo.uninitialized_or_erroneous())
{
SetStatus(TToporStatus::STATUS_ALLOC_FAILED, "CTopi<TLit,TUInd,Compress>::CTopi: couldn't allocate m_VarInfo");
}
else if (m_TrailLastVarPerDecLevel.uninitialized_or_erroneous())
{
SetStatus(TToporStatus::STATUS_ALLOC_FAILED, "CTopi<TLit,TUInd,Compress>::CTopi: couldn't allocate m_TrailLastVarPerDecLevel");
}
SetMultipliers();
// m_DebugModel = { false, true, false, true, false, false, false, true, false, false, false, false, true, false, true, false, false, true, true, true, true };
}
template <typename TLit, typename TUInd, bool Compress>
void CTopi<TLit, TUInd, Compress>::SetParam(const string& paramName, double newVal)
{
if (m_DumpFile) (*m_DumpFile) << "r " << paramName << " " << newVal << endl;
if (IsUnrecoverable())
{
return;
}
auto HandleContextParam = [&](const string& contextParamPrefix, vector<pair<string, double>>& paramVals)
{
if (paramName.starts_with(contextParamPrefix))
{
paramVals.emplace_back(make_pair(paramName.substr(contextParamPrefix.size()), newVal));
return true;
}
return false;
};
if (HandleContextParam(m_ContextParamAfterInitInvPrefix, m_AfterInitInvParamVals))
{
return;
}
if (HandleContextParam(m_ContextParamShortInvLifetimePrefix, m_ShortInvLifetimeParamVals))
{
return;
}
m_Params.SetParam(paramName, newVal);
if (m_Params.IsError())
{
SetStatus(TToporStatus::STATUS_PARAM_ERROR, m_Params.GetErrorDescr());
}
SetOverallTimeoutIfAny();
if (IsMultiplierParam(paramName) || paramName == m_ModeParamName)
{
SetMultipliers();
}
if (IsVsidsInitOrderParam(paramName) || paramName == m_ModeParamName)
{
m_VsidsHeap.SetInitOrder(m_ParamVsidsInitOrder);
}
}
template <typename TLit, typename TUInd, bool Compress>
bool CTopi<TLit, TUInd, Compress>::IsError() const
{
return IsErroneous();
}
template <typename TLit, typename TUInd, bool Compress>
size_t CTopi<TLit, TUInd, Compress>::GetInitLitNumAlloc() const
{
assert(m_InitVarNumAlloc <= rotr((size_t)1, 1));
const size_t initLitNumAlloc = m_InitVarNumAlloc << 1;
return initLitNumAlloc == 0 ? numeric_limits<size_t>::max() : initLitNumAlloc;
}
template <typename TLit, typename TUInd, bool Compress>
TToporReturnVal CTopi<TLit, TUInd, Compress>::StatusToRetVal() const
{
if (IsUnrecoverable())
{
return UnrecStatusToRetVal();
}
if (m_Status == TToporStatus::STATUS_SAT)
{
return TToporReturnVal::RET_SAT;
}
if (m_Status == TToporStatus::STATUS_UNSAT)
{
return TToporReturnVal::RET_UNSAT;
}
if (m_Status == TToporStatus::STATUS_USER_INTERRUPT)
{
return TToporReturnVal::RET_USER_INTERRUPT;
}
return TToporReturnVal::RET_EXOTIC_ERROR;
}
template <typename TLit, typename TUInd, bool Compress>
TToporReturnVal CTopi<TLit, TUInd, Compress>::UnrecStatusToRetVal() const
{
assert(IsUnrecoverable());
if (unlikely(m_Status == TToporStatus::STATUS_CONTRADICTORY)) return TToporReturnVal::RET_UNSAT;
if (unlikely(m_Status == TToporStatus::STATUS_ALLOC_FAILED)) return TToporReturnVal::RET_MEM_OUT;
if (unlikely(m_Status == TToporStatus::STATUS_INDEX_TOO_NARROW)) return TToporReturnVal::RET_INDEX_TOO_NARROW;
if (unlikely(m_Status == TToporStatus::STATUS_PARAM_ERROR)) return TToporReturnVal::RET_PARAM_ERROR;
if (unlikely(m_Status == TToporStatus::STATUS_ASSUMPTION_REQUIRED_ERROR)) return TToporReturnVal::RET_ASSUMPTION_REQUIRED_ERROR;
if (unlikely(m_Status == TToporStatus::STATUS_GLOBAL_TIMEOUT)) return TToporReturnVal::RET_TIMEOUT_GLOBAL;
if (unlikely(m_Status == TToporStatus::STATUS_DRAT_FILE_PROBLEM)) return TToporReturnVal::RET_DRAT_FILE_PROBLEM;
assert(m_Status == TToporStatus::STATUS_EXOTIC_ERROR);
return TToporReturnVal::RET_EXOTIC_ERROR;
}
template <typename TLit, typename TUInd, bool Compress>
void CTopi<TLit, TUInd, Compress>::HandleIncomingUserVar(TLit v, bool isUndoable)
{
if (unlikely((size_t)v >= m_E2ILitMap.cap()))
{
m_E2ILitMap.reserve_atleast((size_t)v + 1, (size_t)BadULit);
if (unlikely(m_E2ILitMap.uninitialized_or_erroneous()))
{
SetStatus(TToporStatus::STATUS_ALLOC_FAILED, "HandleIncomingUserVar: couldn't reserve m_E2IVarMap");
return;
}
}
if (m_E2ILitMap[v] == 0)
{
m_E2ILitMap[v] = GetLit(++m_LastExistingVar, false);
m_Stat.UpdateMaxInternalVar(m_LastExistingVar);
if (!isUndoable)
{
m_VsidsHeap.insert(m_LastExistingVar, 0.0);
if (unlikely(m_VsidsHeap.uninitialized_or_erroneous()))
{
SetStatus(TToporStatus::STATUS_ALLOC_FAILED, "HandleIncomingUserVar: couldn't insert into m_VsidsHeap");
return;
}
}
else
{
m_NewExternalVarsAddUserCls.push_back(v);
if (unlikely(m_NewExternalVarsAddUserCls.uninitialized_or_erroneous()))
{
SetStatus(TToporStatus::STATUS_ALLOC_FAILED, "HandleIncomingUserVar: couldn't push into m_NewExternalVarsAddUserCls");
return;
}
}
if (unlikely(m_LastExistingVar >= m_AssignmentInfo.cap()))
{
m_AssignmentInfo.reserve_atleast(GetNextVar(), (size_t)0);
if (unlikely(m_AssignmentInfo.uninitialized_or_erroneous()))
{
SetStatus(TToporStatus::STATUS_ALLOC_FAILED, "HandleIncomingUserVar: couldn't realloc m_AssignmentInfo");
return;
}
}
if (unlikely(m_LastExistingVar >= m_VarInfo.cap()))
{
m_VarInfo.reserve_atleast(GetNextVar(), (size_t)0);
if (unlikely(m_VarInfo.uninitialized_or_erroneous()))
{
SetStatus(TToporStatus::STATUS_ALLOC_FAILED, "HandleIncomingUserVar: couldn't realloc m_VarInfo");
return;
}
}
}
m_Stat.m_MaxUserVar = max(m_Stat.m_MaxUserVar, v);
}
template <typename TLit, typename TUInd, bool Compress>
void CTopi<TLit, TUInd, Compress>::DumpSpan(const span<TLit> c, const string& prefix, const string& suffix, bool addNewLine)
{
(*m_DumpFile) << prefix;
for (size_t i = 0; i < c.size(); ++i)
{
(*m_DumpFile) << c[i];
if (i != c.size() - 1)
{
(*m_DumpFile) << ' ';
}
}
(*m_DumpFile) << suffix;
if (addNewLine)
{
(*m_DumpFile) << endl;
}
}
template <typename TLit, typename TUInd, bool Compress>
void CTopi<TLit, TUInd, Compress>::AddUserClause(const span<TLit> c)
{
if (m_DumpFile) DumpSpan(c, "", " 0");
AssumpUnsatCoreCleanUpIfRequired();
if (m_ParamAddClsAtLevel0 && m_DecLevel != 0)
{
Backtrack(0);
}
const auto lastExistingVarStart = m_LastExistingVar;
bool isSuccess = false;
bool boostScores = false;
CApplyFuncOnExitFromScope<> onExit([&]()
{
if (isSuccess)
{
for (TLit ev : m_NewExternalVarsAddUserCls.get_span())
{
m_VsidsHeap.insert(GetVar(m_E2ILitMap[ev]), 0.0);
if (unlikely(m_VsidsHeap.uninitialized_or_erroneous()))
{
SetStatus(TToporStatus::STATUS_ALLOC_FAILED, "AddUserClause: couldn't insert into m_VsidsHeap");
return;
}
}
if (boostScores)
{
auto cls = m_HandleNewUserCls.GetCurrCls();
const double mult = InitClssBoostScoreStratIsClauseSizeAware() ? m_CurrInitClssBoostScoreMult * (1. / (double)(cls.size() - 1)) : m_CurrInitClssBoostScoreMult;
for (TULit l : cls)
{
const TUVar v = GetVar(l);
UpdateScoreVar(v, mult);
}
if (InitClssBoostScoreStratIsReversedOrder())
{
if (m_CurrInitClssBoostScoreMult < m_ParamInitClssBoostMultHighest)
{
m_CurrInitClssBoostScoreMult += m_ParamInitClssBoostMultDelta;
}
}
else
{
if (m_CurrInitClssBoostScoreMult > m_ParamInitClssBoostMultLowest)
{
m_CurrInitClssBoostScoreMult -= m_ParamInitClssBoostMultDelta;
}
}
}
}
else
{
m_LastExistingVar = lastExistingVarStart;
m_Stat.UpdateMaxInternalVar(m_LastExistingVar);
for (TLit ev : m_NewExternalVarsAddUserCls.get_span())
{
m_E2ILitMap[ev] = BadULit;
}
}
m_NewExternalVarsAddUserCls.clear();
});
++m_Stat.m_AddClauseInvs;
if (unlikely(IsUnrecoverable())) return;
if (unlikely(c.empty() || c[0] == 0))
{
// An empty clause
SetStatus(TToporStatus::STATUS_CONTRADICTORY, "AddClause: an empty clause provided");
return;
}
// Storing the new clause while detecting tautologies and filtering out duplicates
m_HandleNewUserCls.NewClause();
for (const TLit l : c)
{
if (unlikely(l == 0))
{
// End-of-clause; we are done with the loop
break;
}
static_assert(sizeof(TLit) <= sizeof(size_t));
if constexpr (sizeof(TLit) == sizeof(size_t))
{
if (unlikely(l == numeric_limits<TLit>::max() || l == numeric_limits<TLit>::min()))
{
// We cannot accommodate the last possible variable if sizeof(TLit) == sizeof(size_t), since the allocation will fail
SetStatus(TToporStatus::STATUS_INDEX_TOO_NARROW, "AddClause: we cannot accommodate the last possible variable if sizeof(TLit) == sizeof(size_t), since allocation will fail");
return;
}
}
// External variable
const TLit v = ExternalLit2ExternalVar(l);
HandleIncomingUserVar(v, true);
if (unlikely(IsUnrecoverable())) return;
const TULit litInternal = E2I(l);
if (IsFalsified(litInternal) && GetAssignedDecLevel(litInternal) == 0)
{
// The literal is falsified at decision level 0: no need to add it to the clause
continue;
}
auto [isTau, isDuplicate, isAllocFailed] = m_HandleNewUserCls.NewLitIsTauIsDuplicate(litInternal);
if (unlikely(isAllocFailed))
{
SetStatus(TToporStatus::STATUS_ALLOC_FAILED, "AddClause: allocation failed during tautology&duplication test");
return;
}
if (unlikely(isTau))
{
return;
}
if (unlikely(isDuplicate))
{
// Duplicate literal
continue;
}
if (m_ParamAddClsRemoveClssGloballySatByLitMinSize != numeric_limits<uint32_t>::max() && c.size() > m_ParamAddClsRemoveClssGloballySatByLitMinSize && IsSatisfied(litInternal) && GetAssignedDecLevel(litInternal) == 0)
{
// The clause is globally satisfied
return;
}
// Handling the watches now
if (unlikely(GetMaxLit(litInternal) >= m_Watches.cap()))
{
m_Watches.reserve_atleast((size_t)GetMaxLit(litInternal) + 1, (size_t)BadULit);
if (m_Watches.uninitialized_or_erroneous())
{
SetStatus(TToporStatus::STATUS_ALLOC_FAILED, "AddClause: couldn't reserve m_Watches");
return;
}
}
auto cls = m_HandleNewUserCls.GetCurrCls();
if (cls.size() == 2 && WLIsLitBetter(cls[1], cls[0]))
{
swap(cls[0], cls[1]);
}
if (cls.size() > 2)
{
if (WLIsLitBetter(litInternal, cls[0]))
{
swap(cls[0], cls.back());
swap(cls.back(), cls[1]);
}
else if (WLIsLitBetter(litInternal, cls[1]))
{
swap(cls[1], cls.back());
}
}
}
auto cls = m_HandleNewUserCls.GetCurrCls();
if (cls.size() == 0)
{
// The clause must have been contradictory (with some 0-level literals removed)
SetStatus(TToporStatus::STATUS_CONTRADICTORY, "AddClause: the clause is contradictory");
return;
}
if (cls.size() == 1 && m_NewExternalVarsAddUserCls.size() == 1 && m_TrailStart != BadUVar && GetAssignedDecLevelVar(m_TrailStart) == 0 && (!IsAssigned(cls[0]) || GetAssignedDecLevel(cls[0]) != 0))
{
// Exchange cls[0] by m_TrailStart's satisfied literal
const TULit iSatLit = GetAssignedLitForVar(m_TrailStart);
const TLit eSatVar = m_NewExternalVarsAddUserCls[0];
const auto eSatLitIt = find_if(c.begin(), c.end(), [&](TLit l) { return ExternalLit2ExternalVar(l) == eSatVar; });
assert(eSatLitIt != c.end());
m_E2ILitMap[eSatVar] = *eSatLitIt == eSatVar ? iSatLit : Negate(iSatLit);
m_NewExternalVarsAddUserCls.clear();
return;
}
isSuccess = true;
assert(NV(2) || P("The user clause to internal clause: " + SUserLits(c) + " to " + SLits(cls) + "\n"));
auto OnContradiction = [&]()
{
const auto decLevel = GetAssignedDecLevel(cls[0]);
assert(decLevel != 0);
Backtrack(decLevel - 1);
assert(!IsAssigned(cls[0]));
m_ToPropagate.erase_if_may_reorder([&](TULit l)
{
return !IsAssigned(l);
});
};
if (cls.size() == 1)
{
// Unary clause: add an implication (or a delayed implication)
if (IsSatisfied(cls[0]))
{
if (GetAssignedDecLevel(cls[0]) != 0)
{
CVector<TContradictionInfo> cis;
ProcessDelayedImplication(cls[0], BadULit, BadClsInd, cis);
}
}
else
{
if (IsFalsified(cls[0]))
{
OnContradiction();
}
Assign(cls[0], BadClsInd, BadULit, 0);
// If we've just assigned the variable globally and the variable is new,
// there is no need to run Simplify, since it doesn't satisfy or appear falsified in any existing clauses, and
// this very function will make sure that any future clauses satisfied by it are skipped and any falsified appearances are skipped too
if (GetVar(cls[0]) == m_LastExistingVar && m_LastExistingVar != lastExistingVarStart && m_LastGloballySatisfiedLitAfterSimplify == m_VarInfo[GetVar(cls[0])].m_TrailPrev)
{
m_LastGloballySatisfiedLitAfterSimplify = m_LastExistingVar;
}
}
return;
}
auto clsStart = AddClsToBufferAndWatch(cls, false);
assert(NV(2) || P("Clause start is " + HexStr(clsStart) + "\n"));
if (unlikely(IsUnrecoverable())) return;
if (InitClssBoostScoreStrat() != 0 && cls.size() > 1)
{
boostScores = true;
}
// Take care of unit and contradictory clauses
if (IsFalsified(cls[0]) || (!IsAssigned(cls[0]) && IsFalsified(cls[1])))
{
if (IsFalsified(cls[0]))
{
// Contradictory!
OnContradiction();
}
// By now the clause is either unit or with two unassigned literals
if (IsFalsified(cls[1]))
{
assert(!IsAssigned(cls[0]));
Assign(cls[0], clsStart, cls[1], GetAssignedDecLevel(cls[1]));
}
}
// Take care of delayed implications
if (IsSatisfied(cls[0]) && IsFalsified(cls[1]) && GetAssignedDecLevel(cls[0]) > GetAssignedDecLevel(cls[1]))
{
CVector<TContradictionInfo> cis;
ProcessDelayedImplication(cls[0], cls[1], clsStart, cis);
}
}
template <typename TLit, typename TUInd, bool Compress>
bool CTopi<TLit, TUInd, Compress>::IsAssumptionRequired(size_t assumpInd)
{
if (m_Status == TToporStatus::STATUS_CONTRADICTORY)
{
return false;
}
if (m_Stat.m_SolveInvs == 0 || m_Status != TToporStatus::STATUS_UNSAT || assumpInd >= m_UserAssumps.size())
{
SetStatus(TToporStatus::STATUS_ASSUMPTION_REQUIRED_ERROR, m_Stat.m_SolveInvs == 0 ? "No Solve invocations so far" : m_Status != TToporStatus::STATUS_UNSAT ? "The latest Solve didn't return TToporStatus::STATUS_UNSAT" : "The assumption ID is beyond the number of assumptions in the latest Solve invocation");
return false;
}
if (m_LatestAssumpUnsatCoreSolveInvocation != m_Stat.m_SolveInvs)
{
assert(m_SelfContrOrGloballyUnsatAssumpSolveInv == m_Stat.m_SolveInvs || m_LatestEarliestFalsifiedAssumpSolveInv == m_Stat.m_SolveInvs);
assert(m_SelfContrOrGloballyUnsatAssumpSolveInv != m_LatestEarliestFalsifiedAssumpSolveInv);
assert(m_LatestEarliestFalsifiedAssumpSolveInv != m_Stat.m_SolveInvs || IsAssigned(m_LatestEarliestFalsifiedAssump));
// Making sure that we may return true only for one external variable out of a group mapped to the same internal variable
for (TLit& externalLit : m_UserAssumps)
{
if (externalLit != 0)
{
TULit l = E2I(externalLit);
assert(l != BadULit);
if ((IsNeg(l) && IsRooted(l)) || (!IsNeg(l) && IsVisited(l)))
{
externalLit = 0;
}
else
{
IsNeg(l) ? MarkRooted(l) : MarkVisited(l);
}
}
}
CleanRooted();
CleanVisited();
if (m_SelfContrOrGloballyUnsatAssumpSolveInv == m_Stat.m_SolveInvs)
{
MarkVisited(m_SelfContrOrGloballyUnsatAssump);
}
if (m_LatestEarliestFalsifiedAssumpSolveInv == m_Stat.m_SolveInvs)
{
MarkDecisionsInConeAsVisited(m_LatestEarliestFalsifiedAssump);
}
m_LatestAssumpUnsatCoreSolveInvocation = m_Stat.m_SolveInvs;
}
const bool nonDuplicatedAndVisited = m_UserAssumps[assumpInd] != 0 && IsVisited(E2I(m_UserAssumps[assumpInd]));
const bool if0DecLevelThenFalsified = m_LatestEarliestFalsifiedAssumpSolveInv == m_Stat.m_SolveInvs || !IsAssigned(m_SelfContrOrGloballyUnsatAssump) || GetAssignedDecLevel(m_SelfContrOrGloballyUnsatAssump) != 0 || IsFalsified(E2I(m_UserAssumps[assumpInd]));
return nonDuplicatedAndVisited && if0DecLevelThenFalsified;
}
template <typename TLit, typename TUInd, bool Compress>
void CTopi<TLit, TUInd, Compress>::AssignAssumptions(size_t firstUnassignedAssumpInd)
{
m_DecLevelOfLastAssignedAssumption = m_DecLevel;
if (firstUnassignedAssumpInd != m_Assumps.cap())
{
TSpanTULit potentiallyUnassignedAssumpsSpan = m_Assumps.get_span_cap(firstUnassignedAssumpInd);
bool someAssumpsAreUnassigned = true;
while (someAssumpsAreUnassigned)
{
someAssumpsAreUnassigned = false;
for (size_t assumpLitI = 0; assumpLitI < potentiallyUnassignedAssumpsSpan.size(); ++assumpLitI)
{
const TULit assumpLit = potentiallyUnassignedAssumpsSpan[assumpLitI];
if (!IsAssigned(assumpLit))
{
NewDecLevel();
[[maybe_unused]] bool isContraditory = Assign(assumpLit, BadULit, BadULit, m_DecLevel);
assert(!isContraditory);
TContradictionInfo contradictionInfo = BCP();
ConflictAnalysisLoop(contradictionInfo, false);
if (unlikely(IsUnrecoverable())) return;
if (m_EarliestFalsifiedAssump != BadULit)
{
if (IsAssigned(m_EarliestFalsifiedAssump) && IsAssumpFalsifiedGivenVar(GetVar(m_EarliestFalsifiedAssump)))
{
SetStatus(TToporStatus::STATUS_UNSAT, "Falsified assumption discovered after setting and propagating an assumption at decision level " + to_string(m_DecLevel));
return;
}
else
{
// BCP backtracked
size_t newFirstUnassignedAssumpInd = FindFirstUnassignedAssumpIndex(firstUnassignedAssumpInd + assumpLitI + 1);
AssignAssumptions(newFirstUnassignedAssumpInd);
return;
}
}
if (!IsAssigned(assumpLit))
{
someAssumpsAreUnassigned = true;
}
}
else
{
assert(!IsFalsified(assumpLit));
}
}
}
assert(all_of(potentiallyUnassignedAssumpsSpan.begin(), potentiallyUnassignedAssumpsSpan.end(), [&](TULit l) { return IsAssigned(l); }));
}
}
template <typename TLit, typename TUInd, bool Compress>
size_t CTopi<TLit, TUInd, Compress>::FindFirstUnassignedAssumpIndex(size_t indexBeyondHandledAssumps)
{
assert(indexBeyondHandledAssumps <= m_Assumps.cap());
auto firstUnassignedAssumpInd = indexBeyondHandledAssumps;
TUVar prevDecVar = m_DecLevel == 0 ? BadUVar : GetDecVar(m_DecLevel);
for (size_t assumpI = indexBeyondHandledAssumps - 1; assumpI != (size_t)-1 && GetVar(m_Assumps[assumpI]) != prevDecVar; --assumpI)
{
const TULit lAssump = m_Assumps[assumpI];
if (!IsAssigned(lAssump))
{
firstUnassignedAssumpInd = assumpI;
}
}
return firstUnassignedAssumpInd;
}
template <typename TLit, typename TUInd, bool Compress>
void CTopi<TLit, TUInd, Compress>::HandleAssumptionsIfBacktrackedBeyondThem()
{
assert(m_DecLevel < m_DecLevelOfLastAssignedAssumption);
assert(m_Assumps.cap() > 0);
size_t firstUnassignedAssumpInd = FindFirstUnassignedAssumpIndex(m_Assumps.cap());
AssignAssumptions(firstUnassignedAssumpInd);
}
template <typename TLit, typename TUInd, bool Compress>
void CTopi<TLit, TUInd, Compress>::HandleAssumptions(const span<TLit> userAssumps)
{
m_UserAssumps.assign(userAssumps.begin(), userAssumps.end());
assert(NV(1) || P("Call " + to_string(m_Stat.m_SolveInvs) + "; User assumptions: " + SUserLits(userAssumps) + "\n"));
m_DecLevelOfLastAssignedAssumption = 0;
if (userAssumps.empty() || userAssumps[0] == 0)
{
return;
}
ReserveExactly(m_Assumps, userAssumps.size(), "m_Assumps in HandleAssumptions");
if (unlikely(IsUnrecoverable())) return;
{
TSpanTULit assumpsSpan = m_Assumps.get_span_cap();
transform(userAssumps.begin(), userAssumps.end(), assumpsSpan.begin(), [&](TLit userLit) {
return E2I(userLit);
});
}
assert(NV(1) || P("Call " + to_string(m_Stat.m_SolveInvs) + "; Intr assumptions: " + SLits(m_Assumps.get_span_cap()) + "\n"));
// Remove the trailing zero (if any)
if (m_Assumps[m_Assumps.cap() - 1] == BadULit)
{
m_Assumps.reserve_exactly(m_Assumps.cap() - 1);
}
assert(m_Assumps.cap() > 0 && m_Assumps[m_Assumps.cap() - 1] != BadULit);
for (size_t assumpI = 0; assumpI < m_Assumps.cap(); ++assumpI)
{
const TULit lAssump = m_Assumps[assumpI];
assert(lAssump != BadULit);
const TUVar vAssump = GetVar(lAssump);
TAssignmentInfo& ai = m_AssignmentInfo[vAssump];
auto RemoveAssump = [&]()
{
if (m_ParamAssumpsSimpAllowReorder)
{
m_Assumps[assumpI--] = m_Assumps[m_Assumps.cap() - 1];
m_Assumps.reserve_exactly(m_Assumps.cap() - 1);
}
else
{
m_Assumps[assumpI] = BadULit;
}
};
if (IsAssigned(lAssump) && GetAssignedDecLevel(lAssump) == 0)
{
if (IsFalsified(lAssump))
{
m_SelfContrOrGloballyUnsatAssump = lAssump;
assert(NV(1) || P("The external assumption " + to_string(*find_if(m_UserAssumps.begin(), m_UserAssumps.end(), [&](TLit l) { return E2I(l) == lAssump; })) + " is falsified at level 0\n"));
m_SelfContrOrGloballyUnsatAssumpSolveInv = m_Stat.m_SolveInvs;
SetStatus(TToporStatus::STATUS_UNSAT, "An assumption is falsified at decision level 0");
return;
}
else
{
RemoveAssump();
}
}
else if (unlikely(ai.m_IsAssump))
{
if (IsNeg(lAssump) != ai.m_IsAssumpNegated)
{
m_SelfContrOrGloballyUnsatAssump = lAssump;
m_SelfContrOrGloballyUnsatAssumpSolveInv = m_Stat.m_SolveInvs;
SetStatus(TToporStatus::STATUS_UNSAT, "Discovered two assumption literals representing the same variable in the two different polarities");
return;
}
else
{
RemoveAssump();
}
}
else
{
ai.m_IsAssump = true;
ai.m_IsAssumpNegated = IsNeg(lAssump);
}
}
if (!m_ParamAssumpsSimpAllowReorder)
{
m_Assumps.remove_if_equal_and_cut_capacity(BadULit);
}
// Find the first decision level, whose decision variable doesn't appear on the list of assumptions
TUV btLevel = 0;
for (TUV dl = 1; dl <= m_DecLevel; ++dl, ++btLevel)
{
const TUVar currDecVar = GetDecVar(dl);
assert(!m_AssignmentInfo[currDecVar].m_IsAssignedInBinary && m_VarInfo[currDecVar].m_ParentClsInd == BadClsInd);
if (!IsAssumpVar(currDecVar) || IsAssumpFalsifiedGivenVar(currDecVar))
{
break;
}
}
// Backtrack to the first uncovered decision level
m_Stat.m_AssumpReuseBacktrackLevelsSaved += btLevel;
Backtrack(btLevel);
// Find the first unassigned assumption and check if there is no contradiction
size_t firstUnassignedAssumpInd = m_Assumps.cap();
for (size_t assumpI = 0; assumpI < m_Assumps.cap(); ++assumpI)
{
const TULit lAssump = m_Assumps[assumpI];
if (firstUnassignedAssumpInd == m_Assumps.cap() && !IsAssigned(lAssump))
{
firstUnassignedAssumpInd = assumpI;
}
const auto isAssigned = IsAssigned(lAssump);
const auto isNegated = IsAssignedNegated(lAssump);
if (isAssigned && isNegated)
{
if (IsAssignedDec(lAssump))
{
m_SelfContrOrGloballyUnsatAssump = lAssump;
m_SelfContrOrGloballyUnsatAssumpSolveInv = m_Stat.m_SolveInvs;
}
else
{
m_LatestEarliestFalsifiedAssump = lAssump;
m_LatestEarliestFalsifiedAssumpSolveInv = m_Stat.m_SolveInvs;
}
SetStatus(TToporStatus::STATUS_UNSAT, "Contradiction between assumptions");
return;
}
}
AssignAssumptions(firstUnassignedAssumpInd);
}
template <typename TLit, typename TUInd, bool Compress>
TToporReturnVal CTopi<TLit, TUInd, Compress>::Solve(const span<TLit> userAssumps, pair<double, bool> toInSecIsCpuTime, uint64_t confThr)
{
if (m_DumpFile)
{
// cout << "\tc ot <TimeOut> <IsCpuTimeOut>" << endl;
(*m_DumpFile) << "ot " << toInSecIsCpuTime.first << " " << (int)toInSecIsCpuTime.second << endl;
// cout << "\tc oc <ConflictThreshold>" << endl;
(*m_DumpFile) << "oc " << confThr << endl;
DumpSpan(userAssumps, "s ", " 0");
}
assert((m_Stat.m_SolveInvs == 0) == (m_QueryCurr == TQueryType::QUERY_NONE));
m_QueryCurr = m_QueryCurr == TQueryType::QUERY_NONE ? TQueryType::QUERY_INIT : confThr <= (uint64_t)m_ParamShortQueryConfThrInv ? TQueryType::QUERY_INC_SHORT : TQueryType::QUERY_INC_NORMAL;
const bool restoreParamsOnExit = m_QueryCurr == TQueryType::QUERY_INC_SHORT && !m_ShortInvLifetimeParamVals.empty();
CTopiParams* paramsToRestore(nullptr);
TToporReturnVal trv = TToporReturnVal::RET_EXOTIC_ERROR;
if (restoreParamsOnExit)
{
assert(m_QueryCurr == TQueryType::QUERY_INC_SHORT && !m_ShortInvLifetimeParamVals.empty());
paramsToRestore = new CTopiParams(m_Params);
if (unlikely(paramsToRestore == nullptr))
{
SetStatus(TToporStatus::STATUS_ALLOC_FAILED, "Solve: paramsToRestore allocation failed");
return trv = UnrecStatusToRetVal();
}
for (auto& pv : m_ShortInvLifetimeParamVals)
{
SetParam(pv.first, pv.second);
if (unlikely(IsUnrecoverable())) return trv = UnrecStatusToRetVal();
}
}
AssumpUnsatCoreCleanUpIfRequired();
if (m_ParamAddClsAtLevel0 && m_DecLevel != 0)
{
Backtrack(0);
}
if (m_ParamVerbosity > 0)
{
if (!m_AxePrinted)
{
PrintAxe();
cout << print_as_color<ansi_color_code::blue>("c Literal bit-width= ") << print_as_color<ansi_color_code::blue>(to_string(sizeof(TLit) << 3)) <<
print_as_color < ansi_color_code::blue>("; Clause-index bit-width= ") << print_as_color<ansi_color_code::blue>(to_string(sizeof(TUInd) << 3)) <<
print_as_color < ansi_color_code::blue>("; Compress = ") << print_as_color<ansi_color_code::blue>(Compress ? "1" : "0") << endl;
}
cout << m_Params.GetAllParamsCurrValues();
}
if (unlikely(IsUnrecoverable())) return trv = UnrecStatusToRetVal();
m_IsSolveOngoing = true;
m_Stat.NewSolveInvocation(m_QueryCurr == CTopi<TLit, TUInd, Compress>::TQueryType::QUERY_INC_SHORT);
CApplyFuncOnExitFromScope<> onExit([&]()
{
if (IsCbLearntOrDrat() && (m_Status == TToporStatus::STATUS_UNSAT || m_Status == TToporStatus::STATUS_CONTRADICTORY))
{
vector<TULit> emptyCls;
NewLearntClsApplyCbLearntDrat(emptyCls);
}
// Clean-up the assumptions
if (m_Assumps.cap() != 0)
{
for (TULit lAssump : m_Assumps.get_span_cap())
{
const TUVar vAssump = GetVar(lAssump);
m_AssignmentInfo[vAssump].m_IsAssump = false;
}
m_Assumps.reserve_exactly(0);
}
m_EarliestFalsifiedAssump = BadULit;
if (m_ParamVerbosity > 0) cout << m_Stat.StatStrShort();
if (m_Stat.m_SolveInvs == m_ParamPrintDebugModelInvocation)
{
PrintDebugModel(trv);
}
m_IsSolveOngoing = false;
if (restoreParamsOnExit)
{
assert(paramsToRestore != nullptr);
m_Params = move(*paramsToRestore);
delete paramsToRestore;
}
if (m_QueryCurr == TQueryType::QUERY_INIT && m_ParamVarActivityUseMapleLevelBreakerAi != m_ParamVarActivityUseMapleLevelBreaker)
{
m_ParamVarActivityUseMapleLevelBreaker = m_ParamVarActivityUseMapleLevelBreakerAi;
}
if (m_QueryCurr == TQueryType::QUERY_INIT && m_ParamAddClsRemoveClssGloballySatByLitMinSizeAi != m_ParamAddClsRemoveClssGloballySatByLitMinSize)
{
m_ParamAddClsRemoveClssGloballySatByLitMinSize = m_ParamAddClsRemoveClssGloballySatByLitMinSizeAi;
}
if (m_QueryCurr == TQueryType::QUERY_INIT)
{
m_VsidsHeap.SetInitOrder(m_ParamVsidsInitOrderAi);
}
if (m_QueryCurr == TQueryType::QUERY_INIT && !m_AfterInitInvParamVals.empty())
{
for (auto& pv : m_AfterInitInvParamVals)
{
SetParam(pv.first, pv.second);
}
}
m_QueryPrev = m_QueryCurr;
if (m_ParamPhaseMngForceSolution && m_Status == TToporStatus::STATUS_SAT)
{
for (TUVar v = 1; v < GetNextVar(); ++v)
{
FixPolarityInternal(GetAssignedLitForVar(v));
}
}
});
auto SetStatusLocalTimeout = [&]() { SetStatus(TToporStatus::STATUS_UNDECIDED, (string)(toInSecIsCpuTime.second ? "CPU" : "Wall") + " timeout of " + to_string(toInSecIsCpuTime.first) + " for the current Solve invocation reached"); };
auto SetStatusGlobalTimeout = [&]() { SetStatus(TToporStatus::STATUS_GLOBAL_TIMEOUT, "Global " + (string)(toInSecIsCpuTime.second ? "CPU" : "Wall") + " timeout of " + to_string(toInSecIsCpuTime.first) + " reached"); };
if (toInSecIsCpuTime.first < 1e100)
{
if (toInSecIsCpuTime.first == 0)
{
SetStatusLocalTimeout();
return trv = TToporReturnVal::RET_TIMEOUT_LOCAL;
}
toInSecIsCpuTime.second ? m_Stat.m_TimeSinceLastSolveStart.SetModeCpuTime() : m_Stat.m_TimeSinceLastSolveStart.SetModeWallTime();
m_Stat.m_TimeSinceLastSolveStart.SetTimeout(toInSecIsCpuTime.first);