Class: SyntaxTree::YARV::InstructionSequence::InstructionList

Inherits:
Object
  • Object
show all
Includes:
Enumerable
Defined in:
lib/syntax_tree/yarv/instruction_sequence.rb

Overview

When the list of instructions is first being created, it’s stored as a linked list. This is to make it easier to perform peephole optimizations and other transformations like instruction specialization.

Defined Under Namespace

Classes: Node

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ InstructionList

Returns a new instance of InstructionList.



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# File 'lib/syntax_tree/yarv/instruction_sequence.rb', line 48

def initialize
  @head_node = nil
  @tail_node = nil
end

Instance Attribute Details

#head_node ⇒ Object (readonly)

Returns the value of attribute head_node.



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# File 'lib/syntax_tree/yarv/instruction_sequence.rb', line 46

def head_node
  @head_node
end

#tail_node ⇒ Object (readonly)

Returns the value of attribute tail_node.



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# File 'lib/syntax_tree/yarv/instruction_sequence.rb', line 46

def tail_node
  @tail_node
end

Instance Method Details

#each(&_blk) ⇒ Object 



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# File 'lib/syntax_tree/yarv/instruction_sequence.rb', line 53

def each(&_blk)
  return to_enum(__method__) unless block_given?
  each_node { |node| yield node.value }
end

#each_node ⇒ Object 



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# File 'lib/syntax_tree/yarv/instruction_sequence.rb', line 58

def each_node
  return to_enum(__method__) unless block_given?
  node = head_node

  while node
    yield node, node.value
    node = node.next_node
  end
end

#push(instruction) ⇒ Object 



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# File 'lib/syntax_tree/yarv/instruction_sequence.rb', line 68

def push(instruction)
  node = Node.new(instruction)

  if head_node.nil?
    @head_node = node
    @tail_node = node
  else
    @tail_node.next_node = node
    @tail_node = node
  end

  node
end