237 lines
7.8 KiB
Ruby
237 lines
7.8 KiB
Ruby
module Register
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class LinkException < Exception
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end
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# Assemble the object machine into a binary.
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# Assemble first to get positions, then write
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# The assemble function determines the length of an object and then actually
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# writes the bytes they are pretty much dependant. In an earlier version they were
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# functions on the objects, but now it has gone to a visitor pattern.
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class Assembler
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include Padding
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TYPE_REF = 0
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TYPE_INT = 1
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TYPE_BITS = 4
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TYPE_LENGTH = 6
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def initialize machine
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@machine = machine
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@load_at = 0x8054 # this is linux/arm
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end
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def assemble
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at = 0
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# want to have the methods first in the executable
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# so first we determine the code length for the methods and set the
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# binary code (array) to right length
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@machine.objects.each do |id , objekt|
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next unless objekt.is_a? Parfait::Method
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# should be fill_to_length (with zeros)
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objekt.binary.set_length(objekt.source.total_byte_length )
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end
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#need the initial jump at 0 and then functions
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@machine.init.set_position(at)
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at += @machine.init.byte_length
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at += 8 # thats the padding
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# then we make sure we really get the binary codes first
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@machine.objects.each do |id , objekt|
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next unless objekt.is_a? Parfait::BinaryCode
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objekt.position = at
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#puts "CODE #{objekt.name} at #{objekt.position}"
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at += objekt.word_length
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end
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# and then everything else
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@machine.objects.each do | id , objekt|
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# have to tell the code that will be assembled where it is to
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# get the jumps/calls right
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if objekt.is_a? Parfait::Method
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objekt.source.set_position( objekt.binary.position )
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end
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next if objekt.is_a? Parfait::BinaryCode
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objekt.position = at
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at += objekt.word_length
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end
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end
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def write_as_string
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# must be same order as assemble
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begin
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return try_write
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rescue LinkException
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# knowing that we fix the problem, we hope to get away with retry.
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retry
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end
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end
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# private method to implement write_as_string. May throw link Exception in which
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# case we try again. Once.
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def try_write
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assemble
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all = @machine.objects.values.sort{|a,b| a.position <=> b.position}
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# debugging loop accesses all positions to force an error if it's not set
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all.each do |objekt|
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#puts "Linked #{objekt.class}(#{objekt.object_id.to_s(16)}) at #{objekt.position.to_s(16)} / #{objekt.word_length.to_s(16)}"
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objekt.position
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end
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# first we need to create the binary code for the methods
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@machine.objects.each do |id , objekt|
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next unless objekt.is_a? Parfait::Method
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assemble_binary_method(objekt)
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end
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@stream = StringIO.new
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@machine.init.assemble( @stream )
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8.times do
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@stream.write_uint8(0)
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end
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# then write the methods to file
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@machine.objects.each do |id, objekt|
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next unless objekt.is_a? Parfait::BinaryCode
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write_any( objekt )
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end
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# and then the rest of the object machine
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@machine.objects.each do | id, objekt|
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next if objekt.is_a? Parfait::BinaryCode
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write_any( objekt )
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end
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#puts "Assembled #{stream_position} bytes"
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return @stream.string
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end
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# assemble the MethodSource into a stringio
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# and then plonk that binary data into the method.code array
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def assemble_binary_method method
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stream = StringIO.new
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#puts "Method #{method.source.instructions.to_ac}"
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begin
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#puts "assemble #{method.source.instructions}"
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method.source.instructions.assemble_all( stream )
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rescue => e
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puts "Assembly error #{method.name}\n#{Sof.write(method.source.instructions).to_s[0...2000]}"
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raise e
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end
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index = 1
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stream.rewind
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#puts "Assembled #{method.name} with length #{stream.length}"
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raise "length error #{method.binary.length} != #{method.source.total_byte_length}" if method.binary.get_length != method.source.total_byte_length
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raise "length error #{stream.length} != #{method.source.total_byte_length}" if method.source.total_byte_length != stream.length
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stream.each_byte do |b|
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method.binary.set(index , b )
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index = index + 1
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end
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end
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def write_any obj
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#puts "Assemble #{obj.class}(#{obj.object_id.to_s(16)}) at stream #{stream_position} pos:#{obj.position.to_s(16)} , len:#{obj.word_length.to_s(16)}"
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if @stream.length != obj.position
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raise "Assemble #{obj.class} #{obj.object_id.to_s(16)} at #{stream_position} not #{obj.position.to_s(16)}"
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end
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if obj.is_a?(Parfait::Word) or obj.is_a?(Symbol)
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write_String obj
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else
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write_object obj
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end
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obj.position
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end
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def type_word array
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word = 0
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index = 0
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array.each do |var |
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#type = (var.class == Integer) ? TYPE_INT : TYPE_REF
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#TODO
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type = TYPE_REF
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word += type << (index * TYPE_BITS)
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index = index + 1
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end
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word += ( (array.get_length + 1 ) / 8 ) << TYPE_LENGTH * TYPE_BITS
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word
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end
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# write type and layout of the instance, and the variables that are passed
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# variables ar values, ie int or refs. For refs the object needs to save the object first
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def write_object( object )
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unless @machine.objects.has_key? object.object_id
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raise "Object(#{object.object_id}) not linked #{object.inspect}"
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end
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layout = object.get_layout
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type = type_word(layout)
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@stream.write_uint32( type )
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write_ref_for(layout )
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layout.each do |var|
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inst = object.instance_variable_get "@#{var}".to_sym
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#puts "Nil for #{object.class}.#{var}" unless inst
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write_ref_for(inst)
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end
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#puts "layout length=#{layout.get_length.to_s(16)} mem_len=#{layout.word_length.to_s(16)}"
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l = layout.get_length
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if( object.is_a? Parfait::Indexed)
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object.each do |inst|
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write_ref_for(inst)
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end
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l += object.get_length
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end
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pad_after( l * 4)
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object.position
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end
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def write_BinaryCode code
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write_String code
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end
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def write_String( string )
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str = string.to_string if string.is_a? Parfait::Word
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str = string.to_s if string.is_a? Symbol
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word = (str.length + 7) / 32 # all object are multiple of 8 words (7 for header)
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# first line is integers, convention is that following lines are the same
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TYPE_LENGTH.times { word = ((word << TYPE_BITS) + TYPE_INT) }
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@stream.write_uint32( word )
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#puts "String is #{string} at #{string.position.to_s(16)} length #{string.length}"
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write_ref_for( string.get_layout ) #ref
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@stream.write str
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pad_after(str.length)
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#puts "String (#{string.length.to_s(16)}) stream #{@stream.length.to_s(16)}"
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end
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def write_Symbol(sym)
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return write_String(sym)
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end
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private
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# write means we write the resulting address straight into the assembler stream
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# object means the object of which we write the address
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def write_ref_for object
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case object
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when nil
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pos = 0 - @load_at
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when Fixnum
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pos = object - @load_at
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else
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pos = object.position
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end
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@stream.write_sint32(pos + @load_at)
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end
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# pad_after is always in bytes and pads (writes 0's) up to the next 8 word boundary
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def pad_after length
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before = stream_position
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pad = padding_for(length)
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pad.times do
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@stream.write_uint8(0)
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end
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after = stream_position
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#puts "padded #{length.to_s(16)} with #{pad.to_s(16)} stream #{before}/#{after}"
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end
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# return the stream length as hex
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def stream_position
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@stream.length.to_s(16)
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end
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end
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Sof::Volotile.add(Assembler , [:objects])
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end
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