Package serp.bytecode

Class LoadInstruction

java.lang.Object
serp.bytecode.CodeEntry
serp.bytecode.Instruction
serp.bytecode.TypedInstruction
serp.bytecode.LocalVariableInstruction
serp.bytecode.LoadInstruction
All Implemented Interfaces:
BCEntity, VisitAcceptor
public class LoadInstruction extends LocalVariableInstruction
Loads a value from the locals table to the stack.

  • Field Details

    • _mappings

      private static final Class[][] _mappings

    • _type

      String _type

  • Constructor Details

    • LoadInstruction

      LoadInstruction(Code owner)

    • LoadInstruction

      LoadInstruction(Code owner, int opcode)

  • Method Details

    • 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

    • 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

    • getLogicalStackChange

      public int getLogicalStackChange()
      Description copied from class: Instruction
      Return the logical number of stack positions changed by this instruction. In other words, ignore weirdness with longs and doubles taking two stack positions.
      Overrides:
      getLogicalStackChange in class Instruction

    • 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.
      Overrides:
      getTypeName in class LocalVariableInstruction

    • 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.
      Overrides:
      setType in class LocalVariableInstruction
      Returns:
      this instruction, for method chaining

    • setThis

      public LoadInstruction setThis()
      Equivalent to setLocal (0).setType (Object.class); the this ptr is always passed in local variable 0.
      Returns:
      this instruction, for method chaining

    • isThis

      public boolean isThis()
      Equivalent to getLocal () == 0 invalid input: '&'invalid input: '&' getType () == Object.class; the this ptr is always passed in local variable 0.

    • equalsInstruction

      public boolean equalsInstruction(Instruction other)
      LoadInstructions are equal if the type they reference the same type and locals index or if either is unset.
      Overrides:
      equalsInstruction in class LocalVariableInstruction

    • 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 orig)
      Description copied from class: Instruction
      Copy the given instruction data.
      Overrides:
      read in class LocalVariableInstruction

    • 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

    • calculateOpcode

      void calculateOpcode()
      Description copied from class: LocalVariableInstruction
      Subclasses with variable opcodes can use this method to be notified that information possibly affecting the opcode has been changed.
      Overrides:
      calculateOpcode in class LocalVariableInstruction

    • calculateLocal

      void calculateLocal()
      Description copied from class: LocalVariableInstruction
      Subclasses can use this method to calculate the locals index based on their opcode.
      Overrides:
      calculateLocal in class LocalVariableInstruction