Class TypeFrame

java.lang.Object
edu.umd.cs.findbugs.ba.Frame<org.apache.bcel.generic.Type>
edu.umd.cs.findbugs.ba.type.TypeFrame
public class TypeFrame extends Frame<org.apache.bcel.generic.Type>
A specialization of Frame for determining the types of values in the Java stack frame (locals and operand stack).
See Also:

  • Field Details

    • exactTypeSet

      private final BitSet exactTypeSet

  • Constructor Details

    • TypeFrame

      public TypeFrame(int numLocals)
      Constructor.

  • Method Details

    • setExact

      public void setExact(int slot, boolean isExact)
      Set whether or not a type in a given slot is exact.
      Parameters:
      slot - the slot
      isExact - true if the slot contains an exact type, false if just an upper bound

    • isExact

      public boolean isExact(int slot)
      Get whether or not a type in a given slot is exact.
      Parameters:
      slot - the slot
      Returns:
      true if the slot contains an exact type, false if just an upper bound

    • clearExactSet

      public void clearExactSet()
      Clear the exact type set. The result is that all slots will be assumed not to contain an exact type.

    • setTop

      public void setTop()
      Description copied from class: Frame
      Make this frame the special "TOP" value. Such Frames are the identity element of the meet operation.
      Overrides:
      setTop in class Frame<org.apache.bcel.generic.Type>

    • copyFrom

      public void copyFrom(Frame<org.apache.bcel.generic.Type> other_)
      Description copied from class: Frame
      Make this Frame exactly the same as the one given as a parameter.
      Overrides:
      copyFrom in class Frame<org.apache.bcel.generic.Type>
      Parameters:
      other_ - the Frame to make this object the same as

    • valueToString

      protected String valueToString(org.apache.bcel.generic.Type value)
      Description copied from class: Frame
      Subclasses may override this if they want to do something special to convert Value objects to Strings. By default, we just call toString() on the values.
      Overrides:
      valueToString in class Frame<org.apache.bcel.generic.Type>

    • getTopType

      public static org.apache.bcel.generic.Type getTopType()
      Get the single instance of the "Top" type.

    • getBottomType

      public static org.apache.bcel.generic.Type getBottomType()
      Get the single instance of the "Bottom" type.

    • getLongExtraType

      public static org.apache.bcel.generic.Type getLongExtraType()
      Get the single instance of the "LongExtra" type.

    • getDoubleExtraType

      public static org.apache.bcel.generic.Type getDoubleExtraType()
      Get the single instance of the "DoubleExtra" type.

    • getNullType

      public static org.apache.bcel.generic.Type getNullType()
      Get the single instance of the "Null" type.

    • pushValue

      public void pushValue(org.apache.bcel.generic.Type value)
      Description copied from class: Frame
      Push a value onto the Java operand stack.
      Overrides:
      pushValue in class Frame<org.apache.bcel.generic.Type>
      Parameters:
      value - the ValueType to push

    • popValue

      public org.apache.bcel.generic.Type popValue() throws DataflowAnalysisException
      Pop a value off of the Java operand stack.
      Overrides:
      popValue in class Frame<org.apache.bcel.generic.Type>
      Returns:
      the value that was popped
      Throws:
      DataflowAnalysisException - if the Java operand stack is empty

    • toString

      public String toString()
      Description copied from class: Frame
      Convert to string.
      Overrides:
      toString in class Frame<org.apache.bcel.generic.Type>