Class: Brainfuck::Stage::Generator

Inherits:
Rubinius::Compiler::Stage
  • Object
show all
Defined in:
lib/brainfuck/stages.rb

Overview

This stage takes a tree of Brainfuck::AST nodes and simply calls the bytecode method on them.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(compiler, last) ⇒ Generator

Returns a new instance of Generator.



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# File 'lib/brainfuck/stages.rb', line 12

def initialize(compiler, last)
  super
  @compiler = compiler
  @variable_scope = nil
  compiler.generator = self
end

Instance Attribute Details

#root ⇒ Object

Returns the value of attribute root.



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# File 'lib/brainfuck/stages.rb', line 10

def root
  @root
end

#variable_scope ⇒ Object

Returns the value of attribute variable_scope.



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# File 'lib/brainfuck/stages.rb', line 10

def variable_scope
  @variable_scope
end

Instance Method Details

#run ⇒ Object 



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# File 'lib/brainfuck/stages.rb', line 19

def run
  @output = Rubinius::Generator.new

  @output.set_line Integer(1)

  # ENVIRONMENT INITIALIZATION
  # --------------------------
  
  # Initialize the heap as a one-cell array containing zero,
  # and the pointer as a zero integer.
  @output.meta_push_0
  @output.set_local 1
  @output.cast_array
  @output.set_local 0

  @input.bytecode @output

  bottom = @output.new_label

  @output.push_const :ENV
  @output.push_literal "DEBUG"
  @output.send :[], 1, false

  @output.gif bottom

  # Print the heap and the pointer if ENV['DEBUG']
  @output.push_literal "Heap: "

  @output.push_local 0
  @output.send :inspect, 0

  @output.push_literal "\nPointer: "
  @output.push_local 1
  @output.push_literal "\n"
  @output.send :print, 5, true
  # end Print

  bottom.set!

  @output.use_detected
  # Return the heap
  @output.push_local 0
  @output.ret
  @output.close

  run_next
end