Preheat oven to 375 degrees F. Spray an 8 or 9-inch pie pan with non-stick cooking spray.
In a small saucepan, stir together 1/2 cup light brown sugar, 1/4 cup light corn syrup, 2 tablespoons butter, 1/8 teaspoon salt, 1 cup chopped pecans.
Bring to a low boil and boil 2 minutes. Immediately remove from heat and stir in 1/2 teaspoon vanilla extract.
Allow to cool while you unroll the crescent rolls.
Spoon approximately 1 tablespoon pecan pie filling in the center of the crescent roll, roll up, and place in prepared pan. Repeat with all the filling and crescent rolls.