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move to relative (to self) addressing

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This commit is contained in:
Torsten Ruger 2014-09-06 23:03:33 +03:00
parent c6072c683b
commit f00b06bb44
1 changed files with 14 additions and 8 deletions
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22
lib/register/assembler.rb
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@ -86,9 +86,9 @@ module Register
raise "Object(#{object.object_id}) not linked #{object.inspect}" unless slot
layout = slot.layout
@stream.write_uint32( 0 ) #TODO types
write_ref(layout[:names])
write_ref_for(layout[:names] , slot )
variables.each do |var|
write_ref var
write_ref_for(var , slot)
end
pad_to( variables.length )
slot.position
@ -106,9 +106,9 @@ module Register
array = slot.objekt
layout = slot.layout
@stream.write_uint32( 0 ) #TODO types
write_ref layout[:names] #ref
write_ref_for(layout[:names],slot) #ref
array.each do |var|
write_ref(var)
write_ref_for(var,slot)
end
pad_to( array.length )
slot.position
@ -160,7 +160,7 @@ module Register
def assemble_CompiledMethod(slot)
method = slot.objekt
@stream.write_uint32( 0 ) #TODO types
write_ref(slot.layout[:names]) #ref of layout
write_ref_for(slot.layout[:names] , slot) #ref of layout
# TODO the assembly may have to move to the object to be more extensible
count = 0
method.blocks.each do |block|
@ -190,7 +190,7 @@ module Register
str = str.to_s if str.is_a? Symbol
layout = slot.layout
@stream.write_uint32( 0 ) #TODO types
write_ref( slot.layout[:names] ) #ref
write_ref_for( slot.layout[:names] , slot) #ref
@stream.write str
pad = (slot.length*4) - 8 - str.length
pad.times do
@ -227,10 +227,16 @@ module Register
nil
end
def write_ref object
# write means we write the resulting address straight into the assembler stream (ie don't return it)
# ref means the object of which we write the address
# and we write the address into the self, given as second parameter
# because of position independence, references/addresses are relative to self
def write_ref_for object , self_slot
slot = get_slot(object)
raise "Object (#{object.object_id}) not linked #{object.inspect}" unless slot
@stream.write_uint32 slot.position
pos = slot.position - self_slot.position
puts "Writin address #{(4*pos).to_s(16)} = #{slot.position.to_s(16)} - #{self_slot.position.to_s(16)}"
@stream.write_sint32 pos * 4
end
# objects only come in lengths of multiple of 8