diff --git a/asm/asm.rb b/asm/asm.rb
index 3465cc9..e7b5f74 100644
--- a/asm/asm.rb
+++ b/asm/asm.rb
@@ -1,7 +1,7 @@
 # Assembler container module.  Sub modules are Text and Binary, which
 # both export the same interface for generating either assembly or
 # machine code for x86.
-# 
+#
 # sjs
 # may 2009
 
diff --git a/asm/binary.rb b/asm/binary.rb
index caa8231..f7c8a79 100644
--- a/asm/binary.rb
+++ b/asm/binary.rb
@@ -1,7 +1,7 @@
 # A very basic x86 assembler library for Ruby.  Generally the
 # instructions implemented are the minimum needed by the compiler this
 # is written for.  x86 is just too big.
-# 
+#
 # sjs
 # may 2009
 #
@@ -23,7 +23,7 @@ module Assembler
     DEBUG_OUTPUT = false
 
     # 0.size gives the real answer, we only do x86-32 though
-    MachineBytes = 4    
+    MachineBytes = 4
     MachineBits = MachineBytes * 8
     MinSigned = -1 * 2**(MachineBits-1)
     MaxSigned = 2**(MachineBits-1) - 1
@@ -65,7 +65,7 @@ module Assembler
       @symtab = symtab
       @objwriter_class = objwriter_class
       # @objwriter = objwriter
-      
+
       # Almost a byte array, except for addresses.
       #
       # Addresses take the form [:<type>, <name>]
@@ -96,7 +96,7 @@ module Assembler
       X86_exit[@platform].each {|byte| emit_byte(byte)}
 
       byte_array = resolve_labels
-      
+
       #puts "1st pass: " + byte_array.inspect if DEBUG_OUTPUT
 
       binary = package(byte_array)
@@ -114,7 +114,7 @@ module Assembler
       # outline:
       #  - resolve all variable proxies in @proxies replacing
       #    the 4 bytes (0xff) with the real address
-      
+
       bss_offset = @symtab.bss_offset
       const_offset = @symtab.const_offset
       @proxies.each do |i, proxy|
@@ -197,7 +197,7 @@ module Assembler
     def label?(x)
       x.is_a?(Array) && x[0] == :label
     end
-    
+
     # XXX this should probably evaluate the value somehow
     def defconst(name, bytes, value)
       @symtab.defconst(name, bytes, value)
@@ -247,18 +247,18 @@ module Assembler
     def asm
       # stash the current number of bytes written
       instruction_offset = @ip
-      
+
       print "0x#{@ip.to_s(16).rjust(4, '0')}\t" if DEBUG_OUTPUT
 
       yield
-      
+
       # return the number of bytes written
       @ip - instruction_offset
-      
+
       puts if DEBUG_OUTPUT
     end
-    
-    
+
+
     def emit_byte(byte)
 
       ##### The joke's on me! Array#pack('c*') already does this.  It is nice to see
@@ -276,12 +276,12 @@ module Assembler
 
       # make sure it's a byte
       raise "not a byte: #{byte.inspect}" unless byte == byte & 0xff
-      
+
       byte = byte & 0xff
       ###  end of pointless code
-      
+
       print (byte >= 0 && byte < 0x10 ? '0' : '') + byte.to_s(16) + ' ' if DEBUG_OUTPUT
-      
+
       @ir << byte
       @ip += 1
     end
@@ -314,7 +314,7 @@ module Assembler
     def emit_dword(num)
       num_to_quad(num).each { |byte| emit_byte(byte) }
     end
-    
+
     def mklabel(suffix=nil)
       @symtab.unique_label(suffix)
     end
@@ -372,7 +372,7 @@ module Assembler
               mod = 1
               disp8 = eff_addr.index
 
-            # disp32, mod == 10  
+            # disp32, mod == 10
             elsif SignedRange === eff_addr.index
               mod = 2
               disp32 = eff_addr.index
@@ -501,7 +501,7 @@ module Assembler
 
     def log2(x, tol=1e-13)
       result = 0.0
-      
+
       # Integer part
       while x < 1
         resultp -= 1
@@ -511,7 +511,7 @@ module Assembler
         result += 1
         x /= 2
       end
-      
+
       # Fractional part
       fp = 1.0
       while fp >= tol
@@ -521,7 +521,7 @@ module Assembler
           x /= 2
           result += fp
         end
-      end 
+      end
       result
     end
 
@@ -537,14 +537,14 @@ module Assembler
     #   6.  mov reg8, r/m8
     #   7.  mov r/m8, imm8
     def mov(dest, src)
-      
+
       # These 2 are used in the same way, just the name differs to make the
       # meaning clear.  They are 4-byte values that are emited at the end if
       # they are non-nil.  Only one of them will be emited, and if both are
       # non-nil that one is immediate.
       immediate = nil
       offset = nil
-      
+
       # This is an array of arguments to be passed to emit_modrm, if it is set.
       modrm = nil
 
@@ -580,7 +580,7 @@ module Assembler
         opcode = 0xc7
         modrm = [dest, 0]
         immediate = src
-      
+
       # version 5: mov r/m8, r8
       elsif rm?(dest, :byte) && register?(src, :byte)
         opcode = 0x88
@@ -627,12 +627,12 @@ module Assembler
           emit_byte(immediate_byte)
 
         end
-      end    
+      end
     end
 
 
     def movzx(dest, src)
-      
+
       # movzx Gv, ??
       if register?(dest)
 
@@ -648,10 +648,10 @@ module Assembler
           emit_byte(0x0f)
           emit_byte(opcode)
           emit_modrm(src, dest.regnum)
-        end      
-      
+        end
+
       else
-        
+
         raise "unimplemented MOVZX instruction, << dest=#{dest.inspect} >> src=#{src.inspect}"
       end
     end
@@ -700,21 +700,21 @@ module Assembler
            emit_modrm(dest, 0)
            emit_dword(src)
          end
-      
+
       # add eax, imm32
       elsif dest == EAX && immediate?(src)
         asm do
           emit_byte(0x05)
           emit_dword(src)
         end
-      
+
       # add reg32, r/m32
       elsif register?(dest) && rm?(src)
         asm do
           emit_byte(0x03)
           emit_modrm(src, dest.regnum)
         end
-      
+
       else
         raise "unsupported ADD instruction, dest=#{dest.inspect} src=#{src.inspect}"
       end
@@ -729,7 +729,7 @@ module Assembler
           emit_modrm(dest, 5)
           emit_byte(src)
         end
-        
+
       # sub r/m32, imm32
       elsif rm?(dest) && immediate?(src)
         asm do
@@ -737,7 +737,7 @@ module Assembler
           emit_modrm(dest, 5)
           emit_dword(src)
         end
-      
+
       # sub r/m32, reg32
       elsif rm?(dest) && register?(src)
         asm do
@@ -803,8 +803,8 @@ module Assembler
         end
       end
     end
-    
-    
+
+
     def dec(op)
       if register?(op)
         # dec reg32
@@ -827,7 +827,7 @@ module Assembler
           emit_modrm(op, 5)
           emit_byte(n)
         end
-                  
+
       else
         raise "unsupported SHR instruction, op=#{op.inspect}, n=#{n.inspect}"
       end
@@ -878,18 +878,18 @@ module Assembler
           emit_byte(0x31)
           emit_modrm(dest, src.regnum)
         end
-        
+
       else
         raise "unsupported XOR instruction, dest=#{dest.inspect} src=#{src.inspect}"
       end
     end
-  
-  
+
+
     def not_(op)
       group3(op, 2, 'NOT')
     end
     alias_method :not, :not_
-  
+
 
     def neg(op)
       group3(op, 3, 'NEG')
@@ -900,19 +900,19 @@ module Assembler
       # push reg32
       if register?(op)
         asm { emit_byte(0x50 + op.regnum) }
-        
+
       elsif immediate?(op, :byte)
         asm do
           emit_byte(0x6a)
           emit_byte(op)
         end
-        
+
       elsif immediate?(op)
         asm do
           emit_byte(0x68)
           emit_dword(op)
         end
-      
+
       else
         raise "unsupported PUSH instruction: op=#{op.inspect}"
       end
@@ -923,7 +923,7 @@ module Assembler
       # pop reg32
       if register?(op)
         asm { emit_byte(0x58 + op.regnum) }
-        
+
       else
         raise "unsupported POP instruction: op=#{op.inspect}"
       end
@@ -937,14 +937,14 @@ module Assembler
           emit_byte(0x39)
           emit_modrm(op1, op2.regnum)
         end
-      
+
       # cmp eax, imm32
       elsif op1 == EAX && immediate?(op2)
         asm do
           emit_byte(0x3d)
           emit_dword(op2)
         end
-        
+
       else
         raise "unsupported CMP instruction: op1=#{op1.inspect} op2=#{op2.inspect}"
       end
@@ -977,7 +977,7 @@ module Assembler
 
     # Only Jcc rel32 is supported.
     def jcc(instruction, label)
-      opcode = JccOpcodeMap[instruction]      
+      opcode = JccOpcodeMap[instruction]
       asm do
         emit_byte(0x0f)
         emit_byte(opcode)
@@ -1025,7 +1025,7 @@ module Assembler
       unless SignedByte === delta
         raise "LOOP can only jump -128 to 127 bytes, #{label} is #{delta} bytes away"
       end
-      
+
       asm do
         emit_byte(0xe2)
         emit_byte(delta)
@@ -1035,10 +1035,10 @@ module Assembler
 
 
     # Opcode group #3.  1-byte opcode, 1 operand (r/m8 or r/m32).
-    # 
+    #
     # Members of this group are: DIV, IDIV, MUL, IMUL, NEG, NOT, and TEST.
     def group3(op, reg, instruction)
-      opcode = 
+      opcode =
         if rm?(op, 8)
           0xf6
         elsif rm?(op)
@@ -1055,5 +1055,5 @@ module Assembler
 
 
   end # class Binary
-  
+
 end # module Assembler
diff --git a/asm/cstruct.rb b/asm/cstruct.rb
index 9db42bc..d0602e7 100644
--- a/asm/cstruct.rb
+++ b/asm/cstruct.rb
@@ -4,7 +4,7 @@
 # subclassed just like any other class.  A nice side-effect of this
 # syntax is that it is always clear that a CStruct is just a class and
 # instances of the struct are objects.
-#    
+#
 # Some light metaprogramming is used to make the following syntax possible:
 #
 # class MachHeader < CStruct
@@ -21,12 +21,12 @@
 #   uint32 :cmd
 #   uint32 :cmdsize
 # end
-# 
+#
 # # inherits cmd and cmdsize as the first 2 fields
 # class SegmentCommand < LoadCommand
 #   string :segname, 16
 #   uint32 :vmaddr
-#   uint32 
+#   uint32
 # end
 #
 # Nothing tricky or confusing there.  Members of a CStruct class are
@@ -56,7 +56,7 @@ class CStruct
   ###################
   # Class Constants #
   ###################
-  
+
   # Size in bytes.
   SizeMap = {
     :int8   => 1,
@@ -89,7 +89,7 @@ class CStruct
     :uint   => 'I',
     :char   => 'C'
   }
-  
+
   # Only needed when unpacking is different from packing, i.e. strings w/ lambdas in PackMap.
   UnpackMap = {
     :string => lambda do |str, *opts|
@@ -99,11 +99,11 @@ class CStruct
                         val
                       end
   }
-  
+
   ##########################
   # Class Instance Methods #
   ##########################
-  
+
   # Note: const_get and const_set are used so the constants are bound
   #       at runtime, to the real class that has subclassed CStruct.
   #       I figured Ruby would do this but I haven't looked at the
@@ -112,31 +112,31 @@ class CStruct
   #       All of this could probably be avoided with Ruby 1.9 and
   #       private class variables.  That is definitely something to
   #       experiment with.
-  
+
   class <<self
-    
+
     def inherited(subclass)
       subclass.instance_eval do
-        
+
         # These "constants" are only constant references.  Structs can
         # be modified.  After the struct is defined it is still open,
         # but good practice would be not to change a struct after it
         # has been defined.
-        # 
+        #
         # To support inheritance properly we try to get these
         # constants from the enclosing scope (and clone them before
         # modifying them!), and default to empty, er, defaults.
-        
+
         members = const_get(:Members).clone rescue []
         member_index = const_get(:MemberIndex).clone rescue {}
         member_sizes = const_get(:MemberSizes).clone rescue {}
         member_opts = const_get(:MemberOptions).clone rescue {}
-        
+
         const_set(:Members, members)
         const_set(:MemberIndex, member_index)
         const_set(:MemberSizes, member_sizes)
         const_set(:MemberOptions, member_opts)
-        
+
       end
     end
 
@@ -144,7 +144,7 @@ class CStruct
     # Define a method for each size name, and when that method is called it updates
     # the struct class accordingly.
     SizeMap.keys.each do |type|
-      
+
       define_method(type) do |name, *args|
         name = name.to_sym
         const_get(:MemberIndex)[name] = const_get(:Members).size
@@ -152,21 +152,21 @@ class CStruct
         const_get(:MemberOptions)[name] = args
         const_get(:Members) << name
       end
-      
+
     end
-    
-    
+
+
     # Return the number of members.
     def size
       const_get(:Members).size
     end
     alias_method :length, :size
-    
+
     # Return the number of bytes occupied in memory or on disk.
     def bytesize
       const_get(:Members).inject(0) { |size, name| size + sizeof(name) }
     end
-        
+
     def sizeof(name)
       value = SizeMap[const_get(:MemberSizes)[name]]
       value.respond_to?(:call) ? value.call(*const_get(:MemberOptions)[name]) : value
@@ -178,14 +178,14 @@ class CStruct
     end
 
   end
-  
+
 
   ####################
   # Instance Methods #
   ####################
-  
+
   attr_reader :values
-  
+
   def initialize(*args)
     @values = args
   end
@@ -199,7 +199,7 @@ class CStruct
         [vals.shift].pack(patt)
       else
         patt.call(vals.shift, *member_options[name])
-      end      
+      end
     end.join
   end
 
@@ -218,47 +218,47 @@ class CStruct
     end
     self
   end
-  
+
   def pack_pattern
     members.map { |name| PackMap[member_sizes[name]] }
   end
-  
+
   def unpack_pattern
     members.map { |name| UnpackMap[member_sizes[name]] || PackMap[member_sizes[name]] }
   end
-  
+
   def [](name_or_idx)
     case name_or_idx
-      
+
     when Numeric
       idx = name_or_idx
       @values[idx]
-      
+
     when String, Symbol
       name = name_or_idx.to_sym
       @values[member_index[name]]
-      
+
     else
       raise ArgumentError, "expected name or index, got #{name_or_idx.inspect}"
     end
   end
-  
+
   def []=(name_or_idx, value)
     case name_or_idx
-      
+
     when Numeric
       idx = name_or_idx
       @values[idx] = value
-      
+
     when String, Symbol
       name = name_or_idx.to_sym
       @values[member_index[name]] = value
-      
+
     else
       raise ArgumentError, "expected name or index, got #{name_or_idx.inspect}"
     end
   end
-  
+
   def ==(other)
     puts @values.inspect
     puts other.values.inspect
@@ -270,16 +270,16 @@ class CStruct
   def each(&block)
     @values.each(&block)
   end
-  
+
   def each_pair(&block)
     members.zip(@values).each(&block)
   end
-  
+
   def size
     members.size
   end
   alias_method :length, :size
-  
+
   def sizeof(name)
     self.class.sizeof(name)
   end
@@ -296,21 +296,21 @@ class CStruct
   def members
     self.class::Members
   end
-  
+
   def member_index
     self.class::MemberIndex
   end
-  
+
   def member_sizes
     self.class::MemberSizes
   end
- 
+
   def member_options
     self.class::MemberOptions
   end
- 
+
   # The last expression is returned, so return self instead of junk.
-  self  
+  self
 end
 
 
diff --git a/asm/elfsymtab.rb b/asm/elfsymtab.rb
index 0127c5f..96813e4 100644
--- a/asm/elfsymtab.rb
+++ b/asm/elfsymtab.rb
@@ -1,7 +1,7 @@
 module Assembler
-  
+
   class ELFSymtab < Symtab
-    
+
   end
-  
+
 end
\ No newline at end of file
diff --git a/asm/elfwriter.rb b/asm/elfwriter.rb
index 76401a1..63b39d5 100644
--- a/asm/elfwriter.rb
+++ b/asm/elfwriter.rb
@@ -1,9 +1,9 @@
 module Assembler
-  
+
   class ELFWriter < ObjWriter
-    
-    
-    
+
+
+
   end
-  
+
 end
\ No newline at end of file
diff --git a/asm/macho.rb b/asm/macho.rb
index 5f5f840..9f4121f 100644
--- a/asm/macho.rb
+++ b/asm/macho.rb
@@ -2,7 +2,7 @@ require 'asm/cstruct'
 
 # The MachO module contains constants and structures related to the
 # Mach Object format (Mach-O).  They are relevant to Darwin on OS X.
-# 
+#
 # Constants and structures as defined in /usr/include/mach-o/loader.h
 # on Mac OS X Leopard (10.5.7).  Also see <mach-o/stab.h>,
 # <mach-o/nlist.h>, and <mach-o/reloc.h>.
@@ -13,7 +13,7 @@ module MachO
   ###############
   # Mach header #
   ###############
-  
+
   # Appears at the beginning of every Mach object file.
   class MachHeader < CStruct
     uint32 :magic
@@ -22,7 +22,7 @@ module MachO
     uint32 :filetype
     uint32 :ncmds
     uint32 :sizeofcmds
-    uint32 :flags        
+    uint32 :flags
   end
 
   # Values for the magic field.
@@ -40,13 +40,13 @@ module MachO
   MH_BUNDLE     = 0x8
   MH_DYLIB_STUB = 0x9
   MH_DSYM       = 0xa
-  
+
   # CPU types and subtypes (only Intel for now).
   CPU_TYPE_X86 = 7
-  CPU_TYPE_I386 = CPU_TYPE_X86  
+  CPU_TYPE_I386 = CPU_TYPE_X86
   CPU_SUBTYPE_X86_ALL = 3
-  
-  
+
+
   ############################
   # Load commands / segments #
   ############################
@@ -61,7 +61,7 @@ module MachO
   LC_SYMTAB         = 0x2
   LC_SYMSEG         = 0x3
   LC_THREAD         = 0x4
-  LC_UNIXTHREAD	    = 0x5  
+  LC_UNIXTHREAD	    = 0x5
 
   class SegmentCommand < LoadCommand
     string :segname, 16
@@ -74,7 +74,7 @@ module MachO
     uint32 :nsects
     uint32 :flags
   end
-  
+
 
   # Values for protection fields, maxprot and initprot.
   VM_PROT_NONE       = 0x00
@@ -91,18 +91,18 @@ module MachO
     uint32 :stroff     # Offset of the string table.
     uint32 :strsize    # Size of the string table in bytes.
   end
-  
+
 
   LoadCommandStructMap = {
     LC_SEGMENT => SegmentCommand,
     LC_SYMTAB  => SymtabCommand
   }
-  
+
 
   ############
   # Sections #
   ############
-  
+
   class Section < CStruct
     string :sectname, 16
     string :segname, 16
@@ -116,18 +116,18 @@ module MachO
     uint32 :reserved1
     uint32 :reserved2
   end
-  
+
   # Values for the type bitfield (mask 0x000000ff) of the flags field.
   # (incomplete!)
   S_REGULAR  = 0x0
   S_ZEROFILL = 0x1
   S_CSTRING_LITERALS = 0x2
-  
+
 
   ###########################
   # Relocation info support #
   ###########################
-  
+
   class RelocationInfo < CStruct
     int32  :r_address   # offset in the section to what is being relocated
     uint32 :r_info
@@ -149,12 +149,12 @@ module MachO
   # Relocation types (r_type)
   GENERIC_RELOC_VANILLA = 0
 
-  
+
   ########################
   # Symbol table support #
   ########################
-  
-  
+
+
   # Nlist is used to describe symbols.
   class Nlist < CStruct
     uint32 :n_strx     # Index into string table. Index of zero is the empty string.
@@ -163,7 +163,7 @@ module MachO
     uint16 :n_desc     # TODO See <mach-o/stab.h>.
     uint32 :n_value    # The symbol's value (or stab offset).
   end
-    
+
   # Type flag (see <mach-o/nlist.h> for more details)
   # ---------
   #
@@ -178,13 +178,13 @@ module MachO
   N_PEXT = 0x10   # private external symbol bit
   N_TYPE = 0x0e   # mask for the type bits
   N_EXT  = 0x01   # external symbol bit, set for external symbols (e.g. globals)
-  
+
   # Values for N_TYPE. (incomplete!)
   N_UNDF = 0x0    # undefined, n_sect == NO_SECT
   N_ABS  = 0x2    # absolute, n_sect == NO_SECT
   N_SECT = 0xe    # defined in section number n_sect
-  
+
   NO_SECT = 0
   MAX_SECT = 255
-  
+
 end
diff --git a/asm/machofile.rb b/asm/machofile.rb
index 6064b7e..68cc73b 100644
--- a/asm/machofile.rb
+++ b/asm/machofile.rb
@@ -1,18 +1,18 @@
 require 'asm/macho'
 
 module Assembler
-  
+
   class MachOFile
-    
+
     include MachO
-    
+
     attr_accessor :header, :load_commands, :sections, :data
     attr_accessor :current_segment
-    
+
     def initialize(filetype=MH_OBJECT)
       @header = MachHeader.new(MH_MAGIC, CPU_TYPE_X86, CPU_SUBTYPE_X86_ALL, filetype, 0, 0, 0)
       @load_commands = []              # All defined segments.
-      @sections = {}                   # Map of segment names to lists of sections. 
+      @sections = {}                   # Map of segment names to lists of sections.
       @section_disk_size = Hash.new(0) # Sections store their VM size so we need their sizes on disk.
       @section_offset = 0              # Offset of the next section's data, in bytes.
       @data = []                       # Blobs of data that appear at the end of the file.
@@ -38,28 +38,28 @@ module Assembler
     def load_command(cmdtype)
       struct = LoadCommandStructMap[cmdtype]
       unless struct
-        raise "unsupported load command type: #{cmdtype.inspect}," + 
+        raise "unsupported load command type: #{cmdtype.inspect}," +
               " supported types: #{LoadCommandStructMap.keys.sort.inspect}"
       end
-      
+
       # Fill in all the unknown fields with 0, this is nonsense for
       # string fields but that doesn't really matter.
       dummy_vals = [0] * (struct::Members.size - 2)
-      
+
                          #   cmd        cmdsize          ...
       command = struct.new(cmdtype, struct.bytesize, *dummy_vals)
-      
+
       @load_commands << command
-      
+
       @header[:ncmds] += 1
       @header[:sizeofcmds] += command.bytesize
-      
+
       yield(command) if block_given?
-      
+
       return command
     end
 
-    
+
     # Define a segment in this file.  If a block is given it is passed
     # the new segment.  You can chain calls to segment, it returns self.
     #
@@ -84,25 +84,25 @@ module Assembler
     # them in the segment that they name.
     def section(name, segname, data='', vmsize=data.size,
                 segment=@current_segment, type=S_REGULAR)
-      
+
       # Create the new section.
       section = Section.new(name, segname, @section_offset, vmsize, 0, 0, 0, 0, 0, 0, type)
-      
+
       # Add this section to the map of segment names to sections.
       (@sections[segment[:segname]] ||= []) << section
       @section_disk_size[name] = data.size
       @section_offset += data.size
       @data << data if data.size > 0
-      
+
       # Update the header.
       @header[:sizeofcmds] += section.bytesize
-      
+
       # Update the segment.
       segment[:nsects] += 1
       segment[:cmdsize] += section.bytesize
 
       yield(section) if block_given?
-      
+
       return section
     end
 
@@ -119,7 +119,7 @@ module Assembler
     #
     # For MH_EXECUTE files the text section goes under the segment with the
     # name given (__TEXT).
-    
+
     def text(data, sectname='__text', segname='__TEXT')
       real_segname = nil
       unless @current_segment
@@ -129,7 +129,7 @@ module Assembler
           seg[:initprot] = VM_PROT_READ | VM_PROT_EXECUTE
         end
       end
-      
+
       section(sectname, segname, data) do |sect|
         # reloff and nreloc are calculated later (in calculate_offsets)
         sect[:flags] = 0x400 # S_ATTR_SOME_INSTRUCTIONS
@@ -139,7 +139,7 @@ module Assembler
       @text_segname = real_segname || segname
       @text_sect_index = @sections[@text_segname].length-1
       @text_data_index = @data.length-1
-      
+
       return self
     end
 
@@ -203,14 +203,14 @@ module Assembler
       @reloc_info = reloc_info.map {|x| x.clone}
       return self
     end
-   
+
     # Define a symbol table.  This should usually be placed at the end of the
     # file.
     #
     # This function is overloaded to accept either an array of Nlist structs
     # packed into a byte string (i.e. a C array) and a string table, or a
     # single parameter: any type of Symtab.
-    
+
     def symtab(nlist_ary_or_symtab, stab=nil)
       if stab.nil?
         symtab = nlist_ary_or_symtab
@@ -219,19 +219,19 @@ module Assembler
       else
         nlist_ary = nlist_ary_or_symtab
       end
-      
+
       load_command(LC_SYMTAB) do |st|
         st[:nsyms] = nlist_ary.size
         st[:strsize] = stab.size
         # symoff and stroff are filled in when offsets are recalculated.
       end
-      
+
 #       puts ">>> Defining symbol table:"
 #       puts ">>> #{nlist_ary.size} symbols"
 #       puts ">>> stab = #{stab.inspect}"
 #       puts ">>> nlist_ary = #{nlist_ary.inspect}"
 #       puts ">>> (serialized) = #{nlist_ary.map{|n|n.serialize}.join.inspect}"
-      
+
       @data << nlist_ary.map {|n| n.serialize}.join
       @data << stab
       return self
@@ -240,11 +240,11 @@ module Assembler
 
     # Serialize the entire MachO file into a byte string.  This is simple
     # thanks to CStruct#serialize.
-    
+
     def serialize
       # TODO sanity checks, e.g. assert(@header[:ncmds] == @load_command.size)
       # ... perhaps an option to recalculate such data as well.
-      
+
       # Now that we have all the pieces of the file defined we can calculate
       # the file offsets of segments and sections.
       calculate_offsets
@@ -258,7 +258,7 @@ module Assembler
       # Mach-O file Part 2: Load Commands #
       #####################################
       # dump each load command (which include the section headers under them)
-      @load_commands.map do |cmd|               
+      @load_commands.map do |cmd|
         sects = @sections[cmd[:segname]] rescue []
         sects.inject(cmd.serialize) do |data, sect|
           data + sect.serialize
@@ -271,19 +271,19 @@ module Assembler
       @data.join
     end
 
-    
+
     # Update the file offsets in segments and sections.
-    
+
     def calculate_offsets
 
       # Maintain the offset into the the file on disk.  This is used
       # to update the various structures.
       offset = @header.bytesize
-            
+
       # First pass over load commands.  Most sizes are filled in here.
       @load_commands.each do |cmd|
         case cmd[:cmd]
-          
+
         when LC_SEGMENT
           seg = cmd
           sections = @sections[seg[:segname]]
@@ -292,25 +292,25 @@ module Assembler
           section_disk_size = sections.inject(0) do |total, sect|
             total + @section_disk_size[sect[:sectname]]
           end
-        
+
           ### TODO this should be redundant. try commenting it out one day.
           seg[:nsects] = sections.size
           seg[:cmdsize] = seg.bytesize + section_size
           ###
-          
+
           seg[:vmsize] = section_vm_size
           seg[:filesize] = section_disk_size
-          
+
         when LC_SYMTAB
           # nop
-          
+
         else
           raise "unsupported load command: #{cmd.inspect}"
         end
 
         offset += cmd[:cmdsize]
       end
-      
+
 
       # offset now points to the end of the Mach-O headers, or the beginning
       # of the binary blobs of section data at the end.
@@ -318,16 +318,16 @@ module Assembler
       # Second pass over load commands.  Fill in file offsets.
       @load_commands.each do |cmd|
         case cmd[:cmd]
-          
+
         when LC_SEGMENT
           seg = cmd
-          sections = @sections[seg[:segname]]        
+          sections = @sections[seg[:segname]]
           seg[:fileoff] = offset
           sections.each do |sect|
             sect[:offset] = offset
             offset += @section_disk_size[sect[:sectname]]
           end
-          
+
         when LC_SYMTAB
           if @reloc_info
             # update text section with relocation info
@@ -344,14 +344,14 @@ module Assembler
 
 
         # No else clause is necessary, the first iteration should have caught them.
-          
+
         end
-        
+
       end # @load_commands.each
 
     end # def calculate_offsets
-  
-  
+
+
     #######
     private
     #######
@@ -366,8 +366,8 @@ module Assembler
         raise "unsupported MachO file type: #{@header.inspect}"
       end
     end
-    
-    
+
+
   end # class MachOFile
-  
+
 end # module Assembler
diff --git a/asm/machosym.rb b/asm/machosym.rb
index 6f70e83..7939e69 100644
--- a/asm/machosym.rb
+++ b/asm/machosym.rb
@@ -1,11 +1,11 @@
 require 'asm/macho'
 
 module Assembler
-  
+
   class MachOSym
-    
+
     attr_accessor :name, :type, :segnum, :desc, :value
-    
+
     def initialize(name, type, segnum, desc, value)
       @name = name
       @type = type
@@ -13,17 +13,17 @@ module Assembler
       @desc = desc
       @value = value
     end
-    
-    
+
+
     def to_nlist(strx)
       MachO::Nlist.new(strx, @type, @segnum, @desc, @value)
     end
-    
-    
+
+
     def to_s
       @name
     end
-    
+
   end
-  
+
 end
\ No newline at end of file
diff --git a/asm/machosymtab.rb b/asm/machosymtab.rb
index 329ec38..66b1e3a 100644
--- a/asm/machosymtab.rb
+++ b/asm/machosymtab.rb
@@ -3,9 +3,9 @@ require 'asm/machosym'
 require 'asm/symtab'
 
 module Assembler
-  
+
   class MachOSymtab < Symtab
-    
+
     include MachO
 
     def make_symbols(vars, base_addr, type, segnum)
@@ -23,7 +23,7 @@ module Assembler
       # - All labels are exported.  This should be changed and only functions exported!
 
       section = 1
-      
+
       # Functions (section #1, __text)
       symbols = make_symbols(@labels, text_offset, N_SECT | N_EXT, section)
       section += 1
@@ -46,7 +46,7 @@ module Assembler
     def bss_section
       @consts.size > 0 ? 3 : 2
     end
-    
+
     def nlist_ary
       symbols = {}
       strx = 1
@@ -61,7 +61,7 @@ module Assembler
       end
       return ary
     end
-    
+
     def stab
       # The empty strings result in a string that begins and ends with a null byte
       ['', all_symbols, ''].flatten.map { |sym| sym.to_s }.join("\0")
@@ -84,5 +84,5 @@ module Assembler
     end
 
   end
-  
+
 end
diff --git a/asm/machowriter.rb b/asm/machowriter.rb
index 9ecf83c..202aac7 100644
--- a/asm/machowriter.rb
+++ b/asm/machowriter.rb
@@ -1,4 +1,4 @@
-        
+
     ### XXX development hack!
     def stub_symtab!
       text_segnum = 1
@@ -8,11 +8,11 @@
           ['_main', N_SECT | N_EXT, text_segunm, 0x0]
         ]
       }
-      
+
       nlist_ary = []
       stab = "\0"
       strx = 1  # string index (1-based)
-      
+
       symtab[:functions].each do |name, type, segnum, addr|
         nlist_ary << MachO::Nlist.new(strx, type, segnum, 0, addr)
         stab << "#{name}\0"
@@ -20,7 +20,7 @@
       end
       symtab(nlist_ary, stab)
     end
-    
+
   end
-  
+
 end
\ No newline at end of file
diff --git a/asm/objwriter.rb b/asm/objwriter.rb
index 485bd10..2fd6037 100644
--- a/asm/objwriter.rb
+++ b/asm/objwriter.rb
@@ -1,11 +1,11 @@
 module Assembler
-  
+
   class UnimplementedMethodError < RuntimeError; end
-  
-  
+
+
   # Abstract base class.
   class ObjWriter
-  
+
     def write!(filename)
       File.open(filename, 'wb') do |file|
         file.print(serialize)
@@ -15,12 +15,12 @@ module Assembler
     def fail(name)
       raise UnimplementedMethodError, name
     end
-    
+
     # These methods must be defined for most uses of the library.
     %w[header segment section text data bss symtab serialize].each do |name|
       define_method(name) { fail(name) }
     end
-    
+
   end
-  
+
 end
\ No newline at end of file
diff --git a/asm/registers.rb b/asm/registers.rb
index fcef603..33e9f5f 100644
--- a/asm/registers.rb
+++ b/asm/registers.rb
@@ -1,9 +1,9 @@
 require 'asm/regproxy'
 
 module Assembler
-  
+
   module Registers
-    
+
     # This structure allows for x86 registers of all sizes.  The
     # number of the register is the index of the array in which it was
     # found.  The size of a register in bytes is 2 ** index-into-sub-array.
@@ -25,8 +25,8 @@ module Assembler
         const_set(name, RegisterProxy.new(reg, 8 * (2 ** i), regnum))
       end
     end
-    
-    
+
+
   end
-  
+
 end
\ No newline at end of file
diff --git a/asm/regproxy.rb b/asm/regproxy.rb
index e7ac6b0..0b0a8d4 100644
--- a/asm/regproxy.rb
+++ b/asm/regproxy.rb
@@ -1,5 +1,5 @@
 module Assembler
-  
+
   # Acts like a register and can be used as the base or index in an
   # effective address.
   #
@@ -9,7 +9,7 @@ module Assembler
     attr_reader :name, :size, :regnum
     attr_reader :base, :index, :scale
 
-    
+
     def initialize(name, size, regnum)
       @name = name # attrs are read-only so sharing is ok
       @size = size
@@ -17,7 +17,7 @@ module Assembler
       @base = self
     end
 
-  
+
     def +(index)
       raise "index already specified" if @index
       new_reg = self.clone
@@ -25,7 +25,7 @@ module Assembler
       new_reg
     end
 
-  
+
     def *(scale)
       raise "index must come first" unless @index
       raise "scale already specified" if scale
@@ -39,7 +39,7 @@ module Assembler
       @scale
     end
 
-    
+
     def index?
       @index
     end
@@ -50,18 +50,18 @@ module Assembler
     end
 
 
-        
+
     def to_s
       @name.to_s +
         (@index ? "+#{@index}" : '') +
         (@scale ? "*#{@scale}" : '')
     end
-    
-    
+
+
     def inspect
       to_s
     end
-  
+
   end
 
 end
\ No newline at end of file
diff --git a/asm/symtab.rb b/asm/symtab.rb
index da095d0..1633d0e 100644
--- a/asm/symtab.rb
+++ b/asm/symtab.rb
@@ -9,15 +9,15 @@ module Assembler
   # things will actually live in memory.
 
   class Symtab
-    
+
     attr_accessor :text_offset, :bss_offset, :const_offset
     attr_reader :const_data, :const_size, :bss_size, :reloc_info
-    
+
     def initialize
       @vars = {}                   # Map of variable names to offsets. (bss vars)
       @consts = {}                 # Map of constant names to offsets.
       @funcs = {}                  # map of function names to offsets.
-      
+
       # Initial data to load into memory (data for __DATA segment).
       @const_data = ''
 
@@ -36,7 +36,7 @@ module Assembler
       @bss_offset = 0
       @const_offset = 0
     end
-    
+
     # Generate a unique label.
     def unique_label(suffix=nil)
       @num_labels += 1
@@ -52,19 +52,19 @@ module Assembler
       @labels[name] = offset
       return name
     end
-    
+
 
     def lookup_label(name)
       @labels[name]
     end
-    
-    
+
+
     def defvar(name, bytes)
       @vars[name] = @bss_size
       @bss_size += bytes
     end
 
-    
+
     def defconst(name, value, bytes)
       @consts[name] = @const_size
       @const_size += bytes
@@ -76,15 +76,15 @@ module Assembler
       @funcs[name] = offset
     end
 
-    
+
     def var(name)
       @vars[name]
     end
-    
+
     def var?(name)
       @vars.has_key?(name)
     end
-    
+
     def const(name)
       @consts[name]
     end
@@ -94,5 +94,5 @@ module Assembler
     end
 
   end
-  
+
 end
diff --git a/asm/text.rb b/asm/text.rb
index 474087e..5f65c16 100644
--- a/asm/text.rb
+++ b/asm/text.rb
@@ -1,5 +1,5 @@
 # A subset of x86 assembly.
-# 
+#
 # sjs
 # may 2009
 
@@ -174,7 +174,7 @@ module Assembler
       def int(num)
         emit("int 0x#{num.to_s(16)}")
       end
-      
+
       def cdq
         emit("cdq")
       end
diff --git a/asm/varproxy.rb b/asm/varproxy.rb
index 6f25c0d..50cfa51 100644
--- a/asm/varproxy.rb
+++ b/asm/varproxy.rb
@@ -1,5 +1,5 @@
 module Assembler
-  
+
   # Wrap a variable's address so that we can perform arithmetic on it
   # before resolving it when we know where things will go in memory.
   # All we do is catch arithmetic ops and then provide a means to
@@ -10,7 +10,7 @@ module Assembler
 
     attr_reader :name
     attr_accessor :ops
-    
+
     def initialize(name, const=false)
       @name = name
       @const = const
@@ -31,7 +31,7 @@ module Assembler
         addr.send(*op)
       end
     end
-  
+
     def const?
       @const
     end
diff --git a/compiler.rb b/compiler.rb
index c21beed..3ca04f0 100644
--- a/compiler.rb
+++ b/compiler.rb
@@ -18,7 +18,7 @@ class ParseError < StandardError
 end
 
 class Compiler
-  
+
   include Assembler::Registers
 
   Keywords = {
@@ -280,7 +280,7 @@ class Compiler
       false_label = asm.mklabel(:false)
       truthy_label = asm.mklabel(:truthy)
       done_label = asm.mklabel(:done)
-      
+
       asm.cmp(EAX, FALSE)
       asm.jne(truthy_label)
 
@@ -306,7 +306,7 @@ class Compiler
       expected('&&') unless match_word('&&')
       false_label = asm.mklabel(:false)
       done_label = asm.mklabel(:done)
-      
+
       asm.cmp(EAX, FALSE)
       asm.je(false_label)
 
@@ -382,7 +382,7 @@ class Compiler
 
   # a: <on the stack>
   # b: eax
-  # 
+  #
   # If b - a is zero then a = b, and make_boolean will leave the zero
   # to effectively return false.  If b - a is non-zero then a != b,
   # and make_boolean will leave -1 (true) for us in eax.
@@ -409,8 +409,8 @@ class Compiler
   #       the assembler needed to implement, but since the Jcc
   #       instructions are very cheap to implement this is no longer
   #       a concern.
-  
-  
+
+
   # The next 4 relations all compare 2 values a and b, then return
   # true (-1) if the difference was below zero and false (0)
   # otherwise (using JL, jump if less than).
@@ -464,7 +464,7 @@ class Compiler
 
   # a: <on the stack>
   # b: eax
-  # 
+  #
   # if a <= b then !(a > b)
   def le_relation
     # Compare them as in greater than but invert the result.
@@ -506,7 +506,7 @@ class Compiler
     end
     @indent -= 1
   end
-  
+
   # Parse an if-else statement.
   def if_else_stmt
     else_label = asm.mklabel(:end_or_else)
@@ -528,7 +528,7 @@ class Compiler
   end
 
   # Used to implement the Two-Label-Loops (while, until, repeat).
-  # 
+  #
   # name:  Name of the loop for readable labels.
   # block: Code to execute at the start of each iteration. (e.g. a
   #        condition)
@@ -667,7 +667,7 @@ class Compiler
 
     # 12 bytes: 2 for "0x", 8 hex digits, 2 for newline + null terminator
     hex = asm.var!(h, 12)
-    
+
     asm.block do
       # TODO check sign and prepend '-' if negative
       mov([hex], 0x7830)  # "0x" ==> 48, 120
@@ -757,10 +757,10 @@ class Compiler
     @look = if @input.eof?
               nil
             else
-              @input.readbyte.chr 
+              @input.readbyte.chr
             end
   end
-  
+
   # Report error and halt
   def abort(msg)
     raise ParseError, msg
@@ -777,7 +777,7 @@ class Compiler
       raise ParseError.new(caller, context), "Expected #{what} but got #{got}."
     end
   end
-  
+
 
 
   # Recognize an alphabetical character.