Class: Voodoo::GasELFGenerator

Inherits:
Object
  • Object
show all
Includes:
CommandPostProcessor
Defined in:
lib/voodoo/generators/gas_elf_generator.rb

Overview

Class that generates ELF object files by invoking the GNU assembler on the output of a code generator that generates GNU assembly.

Instance Method Summary collapse

Methods included from CommandPostProcessor

shell_encode, tempfile, write_file_to_io

Constructor Details

#initialize(asmgenerator, extra_args = "") ⇒ GasELFGenerator

Returns a new instance of GasELFGenerator.



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# File 'lib/voodoo/generators/gas_elf_generator.rb', line 8

def initialize asmgenerator, extra_args = ""
  @asmgenerator = asmgenerator
  @extra_args = extra_args
  @output_file_suffix = '.o'
end

Instance Method Details

#output_file_name(input_name) ⇒ Object 



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# File 'lib/voodoo/generators/gas_elf_generator.rb', line 16

def output_file_name input_name
  input_name.sub(/\.voo$/, '') + @output_file_suffix
end

#output_file_suffix ⇒ Object 



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# File 'lib/voodoo/generators/gas_elf_generator.rb', line 20

def output_file_suffix
  @output_file_suffix
end

#write(io) ⇒ Object

Writes the generated code to the given IO handle



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# File 'lib/voodoo/generators/gas_elf_generator.rb', line 25

def write io
  # Create temporary file to write assembly code to
  if io.respond_to? :path
    base = File.basename(io.path).sub(/([^.]*).*/, "\\1")
  else
    base = self.class.name
  end
  
  Tempfile.open(base + '.s') do |asmfile|
    Tempfile.open(base + '.o') do |elffile|
      elffile.close
      # Write assembly code to asmfile
      @asmgenerator.write asmfile
      asmfile.close
      # Find out the name of the GNU assembler
      gas = Voodoo::Config.gas_command
      # Invoke gas on asmfile
      command = "#{gas} #{@extra_args}" +
        " -o #{shell_encode elffile.path}" +
        " #{shell_encode asmfile.path}"
      if system(command)
        write_file_to_io elffile.path, io
      end
      elffile.unlink
    end
    asmfile.unlink
  end
end