ExecutionResults OnAllocate(WamInstruction instruction)
{
Environment = new WamEnvironment(Environment, ReturnInstructionPointer, CutChoicePoint);
ReturnInstructionPointer = WamInstructionPointer.Undefined;
InstructionPointer = InstructionPointer.GetNext();
return(ExecutionResults.None);
}
private PrologVariableList GetPermanentVariables(int stackIndex, bool getCodeTerm)
{
PrologVariableList result = new PrologVariableList();
WamEnvironment environment = WamMachine.GetEnvironment(stackIndex);
if (environment != null)
{
// Retrieve register name assignments from instruction stream.
//
Dictionary <int, string> variableNames;
WamInstructionStream wamInstructionStream = WamMachine.GetInstructionPointer(stackIndex).InstructionStream;
if (wamInstructionStream != null)
{
variableNames = wamInstructionStream.GetPermanentVariableAssignments();
}
else
{
variableNames = new Dictionary <int, string>();
}
for (int index = 0; index < environment.PermanentRegisters.Count; ++index)
{
PrologVariable variable = result.Add(string.Format("Y{0}", index));
string name;
if (variableNames.TryGetValue(index, out name))
{
variable.Name = name;
}
WamReferenceTarget referenceTarget = environment.PermanentRegisters[index];
if (referenceTarget != null)
{
if (getCodeTerm)
{
variable.CodeTerm = referenceTarget.GetCodeTerm();
}
else
{
variable.Text = referenceTarget.ToString();
}
}
}
}
return(result);
}
public WamChoicePoint(WamChoicePoint predecessor, WamEnvironment environment, int stackIndex, WamInstructionPointer returnInstructionPointer, IEnumerable <WamReferenceTarget> argumentRegisters, WamChoicePoint cutChoicePoint)
{
Generation = NextGeneration++;
Predecessor = predecessor;
Environment = environment;
StackIndex = stackIndex;
ReturnInstructionPointer = returnInstructionPointer;
ArgumentRegisters = new WamReferenceTargetList(argumentRegisters);
CutChoicePoint = cutChoicePoint;
BacktrackInstructionPointer = WamInstructionPointer.Undefined;
PredicateEnumerator = null;
Trail = new List <WamVariable>();
}
public WamChoicePoint(WamChoicePoint predecessor, WamEnvironment environment, int stackIndex, WamInstructionPointer returnInstructionPointer, IEnumerable<WamReferenceTarget> argumentRegisters, WamChoicePoint cutChoicePoint)
{
m_generation = s_nextGeneration++;
m_predecessor = predecessor;
m_environment = environment;
m_stackIndex = stackIndex;
m_returnInstructionPointer = returnInstructionPointer;
m_argumentRegisters = new WamReferenceTargetList(argumentRegisters);
m_cutChoicePoint = cutChoicePoint;
m_backtrackInstructionPointer = WamInstructionPointer.Undefined;
m_predicateEnumerator = null;
m_trail = new List<WamVariable>();
}
public WamChoicePoint(WamChoicePoint predecessor, WamEnvironment environment, int stackIndex, WamInstructionPointer returnInstructionPointer, IEnumerable<WamReferenceTarget> argumentRegisters, WamChoicePoint cutChoicePoint)
{
Generation = NextGeneration++;
Predecessor = predecessor;
Environment = environment;
StackIndex = stackIndex;
ReturnInstructionPointer = returnInstructionPointer;
ArgumentRegisters = new WamReferenceTargetList(argumentRegisters);
CutChoicePoint = cutChoicePoint;
BacktrackInstructionPointer = WamInstructionPointer.Undefined;
PredicateEnumerator = null;
Trail = new List<WamVariable>();
}
public WamChoicePoint(WamChoicePoint predecessor, WamEnvironment environment, int stackIndex, WamInstructionPointer returnInstructionPointer, IEnumerable <WamReferenceTarget> argumentRegisters, WamChoicePoint cutChoicePoint)
{
m_generation = s_nextGeneration++;
m_predecessor = predecessor;
m_environment = environment;
m_stackIndex = stackIndex;
m_returnInstructionPointer = returnInstructionPointer;
m_argumentRegisters = new WamReferenceTargetList(argumentRegisters);
m_cutChoicePoint = cutChoicePoint;
m_backtrackInstructionPointer = WamInstructionPointer.Undefined;
m_predicateEnumerator = null;
m_trail = new List <WamVariable>();
}
private ExecutionResults OnAllocate(WamInstruction instruction)
{
Environment = new WamEnvironment(Environment, ReturnInstructionPointer, CutChoicePoint);
ReturnInstructionPointer = WamInstructionPointer.Undefined;
InstructionPointer = InstructionPointer.GetNext();
return ExecutionResults.None;
}