NAME

CPU::Z80::Assembler::JumpOpcode - Represents one jump assembly instruction to be computed at link time

SYNOPSIS

  use CPU::Z80::Assembler::JumpOpcode;
  $opcode = CPU::Z80::Assembler::Opcode->new(
                short_jump => CPU::Z80::Assemble::Opcode->new( ... JR instr ...),
                long_jump  => CPU::Z80::Assemble::Opcode->new( ... JP instr ...));
  $opcode->address;
  $opcode->line;
  $dist = short_jump_dist($address, \%symbol_table);
  $bytes = $opcode->bytes($address, \%symbol_table);
  $size = $opcode->size;

DESCRIPTION

This module defines the class that represents one jump instruction to be added to the object code. The object contains both the short jump form and the long jump form.

During address allocation all short jumps that are out of range are replaced by long jumps.

EXPORTS

Nothing.

FUNCTIONS

new

Creates a new object.

address

Address where this opcode is loaded, computed at link time.

short_jump

Returns the CPU::Z80::Assembler::Opcode object representing the short jump.

long_jump

Returns the CPU::Z80::Assembler::Opcode object representing the long jump.

line

Get/set the line - text, file name and line number where the token was read.

short_jump_dist

Gets the short jump distance, in relation to the address of the next instruction.

Returns more than 127 or less than -128 if the short jump is out of range.

bytes

  $bytes = $opcode->bytes($address, \%symbol_table);

Computes all the expressions in the short jump and returns the bytes string with the result object code.

size

  $size = $opcode->size;

Return the number of bytes that the short_jump opcode will generate.

BUGS and FEEDBACK

See CPU::Z80::Assembler.

AUTHORS, COPYRIGHT and LICENCE

See CPU::Z80::Assembler.