Class: Cfg2asm::CFG::CFGParser

Inherits:
Object
  • Object
show all
Defined in:
lib/cfg2asm/cfg/cfg_parser.rb

Overview

A parser for CFG files.

Instance Method Summary collapse

Constructor Details

#initialize(out, file) ⇒ CFGParser

Returns a new instance of CFGParser.



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# File 'lib/cfg2asm/cfg/cfg_parser.rb', line 12

def initialize(out, file)
  @out = out
  data = File.read(file, encoding: Encoding::ASCII_8BIT)
  if data[0..1].bytes == [0x1f, 0x8b]
    data = Zlib.gunzip(data)
  end
  @reader = StringIO.new(data)
  @state = :any
  @cfg_name = nil
end

Instance Method Details

#read_nmethod ⇒ Object 



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# File 'lib/cfg2asm/cfg/cfg_parser.rb', line 45

def read_nmethod
  raise unless @state == :any

  arch = nil
  arch_width = nil
  code = nil
  comments = []
  raise unless @reader.readline == "begin_nmethod\n"

  loop do
    line = @reader.readline("\n")
    case line
    when /  Platform (.*) (.*)  <\|\|@\n/
      arch = Regexp.last_match(1)
      arch_width = Regexp.last_match(2)
    when /  HexCode (.*) (.*)  <\|\|@\n/
      base = Regexp.last_match(1).to_i(16)
      code = [Regexp.last_match(2)].pack('H*')
      raise if arch.nil? || arch_width.nil?

      code = Code.new(arch, arch_width, base, code)
    when /  Comment (\d*) (.*)  <\|\|@\n/
      offset = Regexp.last_match(1).to_i
      comment = Regexp.last_match(2)
      comments.push Comment.new(offset, comment)
    when "  <<<HexCodeFile\n"
      next
    when "  HexCodeFile>>> <|@\n"
      next
    when "end_nmethod\n"
      break
    when /  (.*)  <\|\|@\n/
      offset = -1
      comment = Regexp.last_match(1)
      comments.push Comment.new(offset, comment)
    when /  (.*)\n/
      offset = -1
      comment = Regexp.last_match(1)
      comments.push Comment.new(offset, comment)
    else
      # In case anything was missed
      raise 'There is currently no case for this line. Please open an issue so it can be addressed.'
    end
  end
  NMethod.new(code, comments)
end

#skip_over_cfg(name) ⇒ Object 



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# File 'lib/cfg2asm/cfg/cfg_parser.rb', line 23

def skip_over_cfg(name)
  loop do
    line = @reader.readline("\n")
    case line
    when "begin_cfg\n"
      @state = :cfg
      @cfg_name = nil
    when /  name "(.*)"\n/
      if @state == :cfg
        @cfg_name = Regexp.last_match(1)
      end
    when "end_cfg\n"
      raise unless @state == :cfg

      @state = :any
      break if @cfg_name == name
    else
      next
    end
  end
end