Class: CodeTools::AST::Flip2

Inherits:
Node
  • Object
show all
Defined in:
lib/rubinius/code/ast/control_flow.rb

Direct Known Subclasses

Flip3

Instance Attribute Summary

Attributes inherited from Node

#line

Instance Method Summary collapse

Methods inherited from Node

#ascii_graph, #attributes, #children, #defined, match_arguments?, match_send?, #new_block_generator, #new_generator, #node_name, #or_bytecode, #pos, #set_child, #transform, transform, transform_comment, transform_kind, transform_kind=, transform_name, #value_defined, #visit, #walk

Constructor Details

#initialize(line, start, finish) ⇒ Flip2

Returns a new instance of Flip2.



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# File 'lib/rubinius/code/ast/control_flow.rb', line 225

def initialize(line, start, finish)
  @line = line
  @start = start
  @finish = finish
end

Instance Method Details

#bytecode(g) ⇒ Object 



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# File 'lib/rubinius/code/ast/control_flow.rb', line 239

def bytecode(g)
  done = g.new_label
  on_label = g.new_label
  index = g.state.flip_flops
  g.state.push_flip_flop

  get_flip_flop(g, index)
  g.goto_if_true on_label

  @start.bytecode(g)
  g.dup
  g.goto_if_false done
  g.pop
  set_flip_flop(g, index, true)

  if exclusive?
    g.goto done
  else
    g.pop
  end

  on_label.set!
  g.push_true
  @finish.bytecode(g)
  g.goto_if_false done
  set_flip_flop(g, index, false)
  g.pop

  done.set!
end

#exclusive? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/rubinius/code/ast/control_flow.rb', line 235

def exclusive?
  false
end

#get_flip_flop(g, index) ⇒ Object 



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# File 'lib/rubinius/code/ast/control_flow.rb', line 270

def get_flip_flop(g, index)
  g.push_rubinius
  g.find_const :Runtime
  g.push_scope
  g.push_int index
  g.send(:get_flip_flop, 2)
end

#set_flip_flop(g, index, value) ⇒ Object 



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# File 'lib/rubinius/code/ast/control_flow.rb', line 278

def set_flip_flop(g, index, value)
  g.push_rubinius
  g.find_const :Runtime
  g.push_scope
  g.push_int index
  if value
    g.push_true
  else
    g.push_false
  end
  g.send(:set_flip_flop, 3)
end

#sexp_name ⇒ Object 



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# File 'lib/rubinius/code/ast/control_flow.rb', line 231

def sexp_name
  :flip2
end

#to_sexp ⇒ Object 



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# File 'lib/rubinius/code/ast/control_flow.rb', line 291

def to_sexp
  [sexp_name, @start.to_sexp, @finish.to_sexp]
end