Esempio n. 1
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 /**
  * 此方法,将root涉及到的符号变量初始化为约束求解中的基本变量
  *
  * @param root
  */
 public void updateVariableAndPrintExpression(ExpressionNode root) {
   HashMap<ExpressionOperator, String> expression_operator = new HashMap<>();
   expression_operator.put(ExpressionOperator.div, "\\");
   expression_operator.put(ExpressionOperator.plus, "+");
   expression_operator.put(ExpressionOperator.minus, "-");
   expression_operator.put(ExpressionOperator.multi, "*");
   if (root != null) {
     //			if(root.operator!=null){
     if (root.getType() == ExpressionType.expression) {
       print("(");
       updateVariable(root.getLeft());
       //				print(root.getOperator());
       print(expression_operator.get(root.getOperator()));
       updateVariable(root.getRight());
       print(")");
     } else {
       print(root.getValue());
       if (root.getType() == ExpressionType.single_variable) {
         String variableName = root.getValue();
         if (!envVariableValueHashMap.containsKey(variableName)) {
           envVariableValueHashMap.put(variableName, Choco.makeIntVar(variableName));
         }
       }
     }
   }
 }
Esempio n. 2
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  // replace every x in tree by (x - vx)
  // i.e. replace fVar with (fvar - vx)
  private void translateX(ExpressionNode en, double vx, int varNo) {
    ExpressionValue left = en.getLeft();
    ExpressionValue right = en.getRight();

    // left tree
    if (left == fVars[varNo]) {
      try { // is there a constant number to the right?
        MyDouble num = (MyDouble) right;
        double temp;
        switch (en.getOperation()) {
          case ExpressionNode.PLUS:
            temp = num.getDouble() - vx;
            if (Kernel.isZero(temp)) {
              expression = expression.replaceAndWrap(en, fVars[varNo]);
            } else if (temp < 0) {
              en.setOperation(ExpressionNode.MINUS);
              num.set(-temp);
            } else {
              num.set(temp);
            }
            return;

          case ExpressionNode.MINUS:
            temp = num.getDouble() + vx;
            if (Kernel.isZero(temp)) {
              expression = expression.replaceAndWrap(en, fVars[varNo]);
            } else if (temp < 0) {
              en.setOperation(ExpressionNode.PLUS);
              num.set(-temp);
            } else {
              num.set(temp);
            }
            return;

          default:
            en.setLeft(shiftXnode(vx, varNo));
        }
      } catch (Exception e) {
        en.setLeft(shiftXnode(vx, varNo));
      }
    } else if (left instanceof ExpressionNode) {
      translateX((ExpressionNode) left, vx, varNo);
    }

    // right tree
    if (right == fVars[varNo]) {
      en.setRight(shiftXnode(vx, varNo));
    } else if (right instanceof ExpressionNode) {
      translateX((ExpressionNode) right, vx, varNo);
    }
  }
Esempio n. 3
0
  /**
   * 对一个ExpressionNode建立其表达式变量并返回
   *
   * @param root the root of a expression tree which provided by symbolic execution environment
   * @return
   */
  public IntegerExpressionVariable constraintVariableModeling(ExpressionNode root) {
    IntegerExpressionVariable result = null;
    ExpressionType type = root.getType();
    if (type == ExpressionType.expression) {
      ExpressionOperator operator = root.getOperator();
      ExpressionNode leftPart = root.getLeft();
      ExpressionNode rightPart = root.getRight();
      ExpressionType leftType = leftPart.getType();
      ExpressionType rightType = rightPart.getType();
      /*
       * 下述步骤是将表达式递归的构建成IntegerExpressionVariable,以提供给最后的Constraint、
       * 主要思路是针对左右两部分不同的类型进行表达式变量的构建,对int,variable和expression进行各种组合
       * 需要注意的是在组合中没有(int, int),这是因为如果两个子节点都是int具体数值的话,那么这个表达式将是可以
       * 被计算出来的,其将会被计算结果代替。这一步的工作可能在符号执行过程中完成,也可能通过一个函数对表达式树进行
       * 后序遍历来完成
       */
      switch (operator) {
        case minus:
          {
            // int and variable
            if (leftType == ExpressionType.single_int
                && rightType == ExpressionType.single_variable) {
              int leftValue = Integer.parseInt(leftPart.getValue());
              IntegerVariable rightValue =
                  (IntegerVariable) envVariableValueHashMap.get(rightPart.getValue());
              print((IntegerVariable) envVariableValueHashMap.get(rightPart.getValue()));
              result = Choco.minus(leftValue, rightValue);
            } else if (rightType == ExpressionType.single_int
                && leftType == ExpressionType.single_variable) {
              int rightValue = Integer.parseInt(rightPart.getValue());
              IntegerVariable leftValue =
                  (IntegerVariable) envVariableValueHashMap.get(leftPart.getValue());
              print((IntegerVariable) envVariableValueHashMap.get(leftPart.getValue()));
              result = Choco.minus(leftValue, rightValue);
            }
            // int and expression
            else if (leftType == ExpressionType.single_int
                && rightType == ExpressionType.expression) {
              int leftValue = Integer.parseInt(leftPart.getValue());
              IntegerExpressionVariable rightValue = constraintVariableModeling(rightPart);
              result = Choco.minus(leftValue, rightValue);
            } else if (rightType == ExpressionType.single_int
                && leftType == ExpressionType.expression) {
              int rightValue = Integer.parseInt(rightPart.getValue());
              IntegerExpressionVariable leftValue = constraintVariableModeling(leftPart);
              result = Choco.minus(leftValue, rightValue);
            }
            // expression and variable
            else if (leftType == ExpressionType.expression
                && rightType == ExpressionType.single_variable) {
              IntegerVariable rightValue =
                  (IntegerVariable) envVariableValueHashMap.get(rightPart.getValue());
              IntegerExpressionVariable leftValue = constraintVariableModeling(leftPart);
              result = Choco.minus(leftValue, rightValue);
            } else if (rightType == ExpressionType.expression
                && leftType == ExpressionType.single_variable) {
              IntegerVariable leftValue =
                  (IntegerVariable) envVariableValueHashMap.get(leftPart.getValue());
              IntegerExpressionVariable rightValue = constraintVariableModeling(rightPart);
              result = Choco.minus(leftValue, rightValue);
            }
            // both are expression
            else if (leftType == ExpressionType.expression
                && rightType == ExpressionType.expression) {
              IntegerExpressionVariable leftValue = constraintVariableModeling(leftPart);
              IntegerExpressionVariable rightValue = constraintVariableModeling(rightPart);
              result = Choco.minus(leftValue, rightValue);
            }
            // both are variable
            else if (leftType == ExpressionType.single_variable
                && rightType == ExpressionType.single_variable) {
              IntegerVariable leftValue =
                  (IntegerVariable) envVariableValueHashMap.get(leftPart.getValue());
              IntegerVariable rightValue =
                  (IntegerVariable) envVariableValueHashMap.get(rightPart.getValue());
              result = Choco.minus(leftValue, rightValue);
            }
            break;
          }
        case plus:
          {
            // int and variable
            if (leftType == ExpressionType.single_int
                && rightType == ExpressionType.single_variable) {
              int leftValue = Integer.parseInt(leftPart.getValue());
              IntegerVariable rightValue =
                  (IntegerVariable) envVariableValueHashMap.get(rightPart.getValue());
              result = Choco.plus(leftValue, rightValue);
            } else if (rightType == ExpressionType.single_int
                && leftType == ExpressionType.single_variable) {
              int rightValue = Integer.parseInt(rightPart.getValue());
              IntegerVariable leftValue =
                  (IntegerVariable) envVariableValueHashMap.get(leftPart.getValue());
              result = Choco.plus(leftValue, rightValue);
            }
            // int and expression
            else if (leftType == ExpressionType.single_int
                && rightType == ExpressionType.expression) {
              int leftValue = Integer.parseInt(leftPart.getValue());
              IntegerExpressionVariable rightValue = constraintVariableModeling(rightPart);
              result = Choco.plus(leftValue, rightValue);
            } else if (rightType == ExpressionType.single_int
                && leftType == ExpressionType.expression) {
              int rightValue = Integer.parseInt(rightPart.getValue());
              IntegerExpressionVariable leftValue = constraintVariableModeling(leftPart);
              result = Choco.plus(leftValue, rightValue);
            }
            // expression and variable
            else if (leftType == ExpressionType.expression
                && rightType == ExpressionType.single_variable) {
              IntegerVariable rightValue =
                  (IntegerVariable) envVariableValueHashMap.get(rightPart.getValue());
              IntegerExpressionVariable leftValue = constraintVariableModeling(leftPart);
              result = Choco.plus(leftValue, rightValue);
            } else if (rightType == ExpressionType.expression
                && leftType == ExpressionType.single_variable) {
              IntegerVariable leftValue =
                  (IntegerVariable) envVariableValueHashMap.get(leftPart.getValue());
              IntegerExpressionVariable rightValue = constraintVariableModeling(rightPart);
              result = Choco.plus(leftValue, rightValue);
            }
            // both are expression
            else if (leftType == ExpressionType.expression
                && rightType == ExpressionType.expression) {
              IntegerExpressionVariable leftValue = constraintVariableModeling(leftPart);
              IntegerExpressionVariable rightValue = constraintVariableModeling(rightPart);
              result = Choco.plus(leftValue, rightValue);
            }
            // both are variable
            else if (leftType == ExpressionType.single_variable
                && rightType == ExpressionType.single_variable) {
              IntegerVariable leftValue =
                  (IntegerVariable) envVariableValueHashMap.get(leftPart.getValue());
              IntegerVariable rightValue =
                  (IntegerVariable) envVariableValueHashMap.get(rightPart.getValue());
              result = Choco.plus(leftValue, rightValue);
            }
            break;
          }
        case multi:
          {
            // int and variable
            if (leftType == ExpressionType.single_int
                && rightType == ExpressionType.single_variable) {
              int leftValue = Integer.parseInt(leftPart.getValue());
              IntegerVariable rightValue =
                  (IntegerVariable) envVariableValueHashMap.get(rightPart.getValue());
              result = Choco.mult(leftValue, rightValue);
            } else if (rightType == ExpressionType.single_int
                && leftType == ExpressionType.single_variable) {
              int rightValue = Integer.parseInt(rightPart.getValue());
              IntegerVariable leftValue =
                  (IntegerVariable) envVariableValueHashMap.get(leftPart.getValue());
              result = Choco.mult(leftValue, rightValue);
            }
            // int and expression
            else if (leftType == ExpressionType.single_int
                && rightType == ExpressionType.expression) {
              int leftValue = Integer.parseInt(leftPart.getValue());
              IntegerExpressionVariable rightValue = constraintVariableModeling(rightPart);
              result = Choco.mult(leftValue, rightValue);
            } else if (rightType == ExpressionType.single_int
                && leftType == ExpressionType.expression) {
              int rightValue = Integer.parseInt(rightPart.getValue());
              IntegerExpressionVariable leftValue = constraintVariableModeling(leftPart);
              result = Choco.mult(leftValue, rightValue);
            }
            // expression and variable
            else if (leftType == ExpressionType.expression
                && rightType == ExpressionType.single_variable) {
              IntegerVariable rightValue =
                  (IntegerVariable) envVariableValueHashMap.get(rightPart.getValue());
              IntegerExpressionVariable leftValue = constraintVariableModeling(leftPart);
              result = Choco.mult(leftValue, rightValue);
            } else if (rightType == ExpressionType.expression
                && leftType == ExpressionType.single_variable) {
              IntegerVariable leftValue =
                  (IntegerVariable) envVariableValueHashMap.get(leftPart.getValue());
              IntegerExpressionVariable rightValue = constraintVariableModeling(rightPart);
              result = Choco.mult(leftValue, rightValue);
            }
            // both are expression
            else if (leftType == ExpressionType.expression
                && rightType == ExpressionType.expression) {
              IntegerExpressionVariable leftValue = constraintVariableModeling(leftPart);
              IntegerExpressionVariable rightValue = constraintVariableModeling(rightPart);
              result = Choco.mult(leftValue, rightValue);
            }
            // both are variable
            else if (leftType == ExpressionType.single_variable
                && rightType == ExpressionType.single_variable) {
              IntegerVariable leftValue =
                  (IntegerVariable) envVariableValueHashMap.get(leftPart.getValue());
              IntegerVariable rightValue =
                  (IntegerVariable) envVariableValueHashMap.get(rightPart.getValue());
              result = Choco.mult(leftValue, rightValue);
            }
            break;
          }
        case div:
          {
            // int and variable
            if (leftType == ExpressionType.single_int
                && rightType == ExpressionType.single_variable) {
              int leftValue = Integer.parseInt(leftPart.getValue());
              IntegerVariable rightValue =
                  (IntegerVariable) envVariableValueHashMap.get(rightPart.getValue());
              result = Choco.div(leftValue, rightValue);
            } else if (rightType == ExpressionType.single_int
                && leftType == ExpressionType.single_variable) {
              int rightValue = Integer.parseInt(rightPart.getValue());
              IntegerVariable leftValue =
                  (IntegerVariable) envVariableValueHashMap.get(leftPart.getValue());
              result = Choco.div(leftValue, rightValue);
            }
            // int and expression
            else if (leftType == ExpressionType.single_int
                && rightType == ExpressionType.expression) {
              int leftValue = Integer.parseInt(leftPart.getValue());
              IntegerExpressionVariable rightValue = constraintVariableModeling(rightPart);
              result = Choco.div(leftValue, rightValue);
            } else if (rightType == ExpressionType.single_int
                && leftType == ExpressionType.expression) {
              int rightValue = Integer.parseInt(rightPart.getValue());
              IntegerExpressionVariable leftValue = constraintVariableModeling(leftPart);
              result = Choco.div(leftValue, rightValue);
            }
            // expression and variable
            else if (leftType == ExpressionType.expression
                && rightType == ExpressionType.single_variable) {
              IntegerVariable rightValue =
                  (IntegerVariable) envVariableValueHashMap.get(rightPart.getValue());
              IntegerExpressionVariable leftValue = constraintVariableModeling(leftPart);
              result = Choco.div(leftValue, rightValue);
            } else if (rightType == ExpressionType.expression
                && leftType == ExpressionType.single_variable) {
              IntegerVariable leftValue =
                  (IntegerVariable) envVariableValueHashMap.get(leftPart.getValue());
              IntegerExpressionVariable rightValue = constraintVariableModeling(rightPart);
              result = Choco.div(leftValue, rightValue);
            }
            // both are expression
            else if (leftType == ExpressionType.expression
                && rightType == ExpressionType.expression) {
              IntegerExpressionVariable leftValue = constraintVariableModeling(leftPart);
              IntegerExpressionVariable rightValue = constraintVariableModeling(rightPart);
              result = Choco.div(leftValue, rightValue);
            }
            // both are variable
            else if (leftType == ExpressionType.single_variable
                && rightType == ExpressionType.single_variable) {
              IntegerVariable leftValue =
                  (IntegerVariable) envVariableValueHashMap.get(leftPart.getValue());
              IntegerVariable rightValue =
                  (IntegerVariable) envVariableValueHashMap.get(rightPart.getValue());
              result = Choco.div(leftValue, rightValue);
            }
            break;
          }
      }

    } else if (type == ExpressionType.single_variable) {
      result = (IntegerVariable) envVariableValueHashMap.get(root.getValue());
    } else if (type == ExpressionType.single_int) {
      System.out.println("Try to make a integer into a variable: " + root.getValue());
    } else {
      System.out.println("can't generate the cp variable" + type);
    }
    /*
     * 被注释掉的这段应该是用不着的
     */
    return result;
  }