Package serp.bytecode

Class ClassInstruction

java.lang.Object
serp.bytecode.CodeEntry
serp.bytecode.Instruction
serp.bytecode.TypedInstruction
serp.bytecode.ClassInstruction
All Implemented Interfaces:
BCEntity, VisitAcceptor
Direct Known Subclasses:
MultiANewArrayInstruction
public class ClassInstruction extends TypedInstruction
An instruction that takes as an argument a class to operate on. Examples include anewarray, checkcast, instance, anew, etc.

  • Field Details

    • _index

      private int _index

  • Constructor Details

    • ClassInstruction

      ClassInstruction(Code owner, int opcode)

  • Method Details

    • getStackChange

      public int getStackChange()
      Description copied from class: Instruction
      Return the number of stack positions this instruction pushes or pops during its execution.
      Overrides:
      getStackChange in class Instruction
      Returns:
      0 if the stack is not affected by this instruction, a positive number if it pushes onto the stack, and a negative number if it pops from the stack

    • getLength

      int getLength()
      Description copied from class: Instruction
      Return the length in bytes of this opcode, including all arguments. For many opcodes this method relies on an up-to-date byte index.
      Overrides:
      getLength in class Instruction

    • getTypeIndex

      public int getTypeIndex()
      Return the ConstantPool index of the ClassEntry describing the class for this instruction.

    • setTypeIndex

      public ClassInstruction setTypeIndex(int index)
      Set the ConstantPool index of the ClassEntry describing the class for this instruction.
      Returns:
      this instruction, for method chaining

    • getTypeName

      public String getTypeName()
      Description copied from class: TypedInstruction
      Return the type name for this instruction. If the type has not been set, this method will return null.
      Specified by:
      getTypeName in class TypedInstruction

    • setType

      public TypedInstruction setType(String type)
      Description copied from class: TypedInstruction
      Set the type of this instruction. Types that have no direct support will be converted accordingly.
      Specified by:
      setType in class TypedInstruction
      Returns:
      this instruction, for method chaining

    • equalsInstruction

      public boolean equalsInstruction(Instruction other)
      ClassInstructions are equal if the type they reference is the same or unset and if their opcodes are equal.
      Overrides:
      equalsInstruction in class Instruction

    • acceptVisit

      public void acceptVisit(BCVisitor visit)
      Description copied from interface: VisitAcceptor
      Accept a visit from a BCVisitor, calling the appropriate methods to notify the visitor that it has entered this entity, and to provide it with the proper callbacks for each sub-entity owned by this one.
      Specified by:
      acceptVisit in interface VisitAcceptor
      Overrides:
      acceptVisit in class Instruction

    • read

      void read(Instruction other)
      Description copied from class: Instruction
      Copy the given instruction data.
      Overrides:
      read in class Instruction

    • read

      void read(DataInput in) throws IOException
      Description copied from class: Instruction
      Read the arguments for this opcode from the given stream. This method should be overridden by opcodes that take arguments.
      Overrides:
      read in class Instruction
      Throws:
      IOException

    • write

      void write(DataOutput out) throws IOException
      Description copied from class: Instruction
      Write the arguments for this opcode to the given stream. This method should be overridden by opcodes that take arguments.
      Overrides:
      write in class Instruction
      Throws:
      IOException