/// <summary> /// [ REFS: 'result', DEREFS: 'resultBefore' ] /// </summary> public override ExpressionBDDEncoding TranslateStatementToBDD(ExpressionBDDEncoding resultBefore, Model model) { ExpressionBDDEncoding result = new ExpressionBDDEncoding(); CUDDNode conditionDD = CUDD.Function.Or(this.Test.TranslateBoolExpToBDD(model).GuardDDs); do { ExpressionBDDEncoding tempResult = new ExpressionBDDEncoding(); List<List<int>> updatedVariablesBefore = new List<List<int>>(); for (int index = 0; index < resultBefore.Count(); index++) { updatedVariablesBefore.Add(model.GetColSupportedVars(resultBefore.GuardDDs[index])); } List<int> usedVariablesInCondition = model.GetRowSupportedVars(conditionDD); for (int j1 = 0; j1 < resultBefore.Count(); j1++) { foreach (int index in usedVariablesInCondition) { if (updatedVariablesBefore[j1].Contains(index)) { conditionDD = CUDD.Variable.SwapVariables(conditionDD, model.GetRowVars(index), model.GetColVars(index)); } } //Add configuration making the While condition true CUDD.Ref(resultBefore.GuardDDs[j1], conditionDD); CUDDNode transition = CUDD.Function.And(resultBefore.GuardDDs[j1], conditionDD); tempResult.AddNodeToGuard(transition); //Add configuration making the While condition false CUDD.Ref(resultBefore.GuardDDs[j1], conditionDD); CUDDNode falseTransition = CUDD.Function.And(resultBefore.GuardDDs[j1], CUDD.Function.Not(conditionDD)); result.AddNodeToGuard(falseTransition); } //There is no any configuration making the While condition true if (tempResult.Count() > 0) { resultBefore.DeRef(); resultBefore = this.Body.TranslateStatementToBDD(tempResult, model); } else { break; } } while (true); resultBefore.DeRef(); return result; }
/// <summary> /// Encode this assignment in a sequence of statements. Return variable values after this assignment based on the current value in resultBefore /// [ REFS: 'result', DEREFS: 'resultBefore' ] /// </summary> public override ExpressionBDDEncoding TranslateStatementToBDD(ExpressionBDDEncoding resultBefore, Model model) { ExpressionBDDEncoding newUpdate = this.TranslateBoolExpToBDD(model); ExpressionBDDEncoding tempResult = new ExpressionBDDEncoding(); List<List<int>> updatedVariablesInNewUpdate = new List<List<int>>(); for (int index = 0; index < newUpdate.Count(); index++) { updatedVariablesInNewUpdate.Add(model.GetColSupportedVars(newUpdate.GuardDDs[index])); } List<List<int>> usedVariableInNewUpdate = new List<List<int>>(); for (int index = 0; index < newUpdate.Count(); index++) { usedVariableInNewUpdate.Add(model.GetRowSupportedVars(newUpdate.GuardDDs[index])); } List<List<int>> updatedVariablesBefore = new List<List<int>>(); for (int index = 0; index < resultBefore.Count(); index++) { updatedVariablesBefore.Add(model.GetColSupportedVars(resultBefore.GuardDDs[index])); } for (int j1 = 0; j1 < resultBefore.Count(); j1++) { for (int j2 = 0; j2 < newUpdate.Count(); j2++) { //a variable is already updated, now is updated again and it also apprears in the value expression if (Assignment.IsComplexUpdate(updatedVariablesBefore[j1], updatedVariablesInNewUpdate[j2], usedVariableInNewUpdate[j2])) { model.CreateTemporaryVar(); Expression newUpdate1; Expression newUpdate2; PropertyAssignment assignment = this as PropertyAssignment; newUpdate1 = new Assignment(Model.TEMPORARY_VARIABLE, this.RightHandExpression); newUpdate2 = new PropertyAssignment(this.RecordExpression, this.PropertyExpression, new Variable(Model.TEMPORARY_VARIABLE)); resultBefore.Ref(); ExpressionBDDEncoding tempResult1 = newUpdate1.TranslateStatementToBDD(resultBefore, model); ExpressionBDDEncoding tempResult2 = newUpdate2.TranslateStatementToBDD(tempResult1, model); //Remove the temporary variable from transition for (int i = 0; i < tempResult2.Count(); i++) { tempResult2.GuardDDs[i] = CUDD.Abstract.ThereExists(tempResult2.GuardDDs[i], model.GetRowVars(Model.TEMPORARY_VARIABLE)); tempResult2.GuardDDs[i] = CUDD.Abstract.ThereExists(tempResult2.GuardDDs[i], model.GetColVars(Model.TEMPORARY_VARIABLE)); tempResult.AddNodeToGuard(tempResult2.GuardDDs[i]); } } else { //swap row, col updated variable in result in the new update command expression CUDDNode update2 = newUpdate.GuardDDs[j2]; CUDD.Ref(update2); foreach (int index in updatedVariablesBefore[j1]) { if (usedVariableInNewUpdate[j2].Contains(index)) { update2 = CUDD.Variable.SwapVariables(update2, model.GetColVars(index), model.GetRowVars(index)); } } //Restrict updated variable in new update of the old update CUDDNode update1 = resultBefore.GuardDDs[j1]; CUDD.Ref(update1); foreach (int index in updatedVariablesInNewUpdate[j2]) { if (updatedVariablesBefore[j1].Contains(index)) { update1 = CUDD.Abstract.ThereExists(update1, model.GetColVars(index)); } } CUDDNode transition = CUDD.Function.And(update1, update2); tempResult.AddNodeToGuard(transition); } } } resultBefore.DeRef(); newUpdate.DeRef(); return tempResult; }
/// <summary> /// Return variable values after the If statement is executed based on resultBefore /// [ REFS: 'result', DEREFS: 'resultBefore' ] /// </summary> public override ExpressionBDDEncoding TranslateStatementToBDD(ExpressionBDDEncoding resultBefore, Model model) { ExpressionBDDEncoding tempResult1 = new ExpressionBDDEncoding(); ExpressionBDDEncoding tempResult2 = new ExpressionBDDEncoding(); List<List<int>> updatedVariablesBefore = new List<List<int>>(); for (int index = 0; index < resultBefore.Count(); index++) { updatedVariablesBefore.Add(model.GetColSupportedVars(resultBefore.GuardDDs[index])); } ExpressionBDDEncoding conditionDD = this.Condition.TranslateBoolExpToBDD(model); List<List<int>> usedVariablesInCondition = new List<List<int>>(); for (int index = 0; index < conditionDD.Count(); index++) { usedVariablesInCondition.Add(model.GetRowSupportedVars(conditionDD.GuardDDs[index])); } for (int j1 = 0; j1 < resultBefore.Count(); j1++) { for (int j2 = 0; j2 < conditionDD.Count(); j2++) { CUDDNode condition = conditionDD.GuardDDs[j2]; CUDD.Ref(condition); foreach (int index in usedVariablesInCondition[j2]) { if (updatedVariablesBefore[j1].Contains(index)) { condition = CUDD.Variable.SwapVariables(condition, model.GetRowVars(index), model.GetColVars(index)); } } CUDD.Ref(resultBefore.GuardDDs[j1]); CUDDNode transition = CUDD.Function.And(resultBefore.GuardDDs[j1], condition); tempResult1.AddNodeToGuard(transition); } } //the condition is not always false (a = 1; if(a > 1)) if (tempResult1.Count() > 0) { tempResult1 = this.ThenPart.TranslateStatementToBDD(tempResult1, model); } // tempResult2 = new ExpressionBDDEncoding(); for (int j1 = 0; j1 < resultBefore.Count(); j1++) { for (int j2 = 0; j2 < conditionDD.Count(); j2++) { CUDDNode condition = conditionDD.GuardDDs[j2]; CUDD.Ref(condition); condition = CUDD.Function.Not(condition); foreach (int index in usedVariablesInCondition[j2]) { if (updatedVariablesBefore[j1].Contains(index)) { condition = CUDD.Variable.SwapVariables(condition, model.GetRowVars(index), model.GetColVars(index)); } } CUDD.Ref(resultBefore.GuardDDs[j1]); CUDDNode transition = CUDD.Function.And(resultBefore.GuardDDs[j1], condition); tempResult2.AddNodeToGuard(transition); } } if (this.ElsePart != null && tempResult2.Count() > 0) { tempResult2 = this.ElsePart.TranslateStatementToBDD(tempResult2, model); } conditionDD.DeRef(); //Combine if (tempResult1.Count() == 0 && tempResult2.Count() == 0)//condition always false, no else part { return resultBefore; } else if (tempResult1.Count() == 0 && tempResult2.Count() > 0)//condition always false, having else part { resultBefore.DeRef(); return tempResult2; } else { resultBefore.DeRef(); tempResult1.AddNodeToGuard(tempResult2.GuardDDs); return tempResult1; } }