Package org.biojava.utils.bytecode

Class InstructionVector

java.lang.Object
org.biojava.utils.bytecode.InstructionVector
All Implemented Interfaces:
CodeGenerator
public class InstructionVector extends Object implements CodeGenerator
A list of Instructions and/or other CodeGenerator objects.
Author:
Thomas Down, Matthew Pocock

  • Constructor Details

    • InstructionVector

      public InstructionVector()

  • Method Details

    • add

      public void add(CodeGenerator g)

    • size

      public int size()

    • add

      public void add(int pos, CodeGenerator g)

    • remove

      public void remove(int pos)

    • generatorAt

      public CodeGenerator generatorAt(int pos)

    • getStartLabel

      public Label getStartLabel()

    • getEndLabel

      public Label getEndLabel()

    • writeCode

      public void writeCode(CodeContext ctx) throws CodeException
      Description copied from interface: CodeGenerator
      Write the byte or bytes for this CodeGenerator to a CodeContext.
      Specified by:
      writeCode in interface CodeGenerator
      Parameters:
      ctx - a CodeContext to write to
      Throws:
      CodeException - if there was some failure in writing to the context

    • stackDepth

      public int stackDepth()
      Description copied from interface: CodeGenerator
      Return the total depth of the stack required by this CodeGenerator.

      For single byte-code instructions, this will be the same as stackDelta() if stackDelta() is positive, zero otherwise. For a compound instruction, this will be the maximum stack depth required to execute all sub-instructions.

      Specified by:
      stackDepth in interface CodeGenerator
      Returns:
      the stack depth needed

    • stackDelta

      public int stackDelta()
      Description copied from interface: CodeGenerator
      Return the change in the stack dept this generator will cause.

      In the case of an instruction that adds items to the stack, stackDelta will be positive. For instructions that removes items from the stack, this will be negative.

      Specified by:
      stackDelta in interface CodeGenerator
      Returns:
      the change between stack depth before and after execution of this code