100 lines
3.8 KiB
Ruby
100 lines
3.8 KiB
Ruby
module Core
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class Kernel
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#there are no Kernel instances, only class methods.
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# We use this module syntax to avoid the (ugly) self (also eases searching).
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module ClassMethods
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def putstring context
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function = Vm::Function.new(:putstring , Vm::Integer , [] )
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ret = Vm::RegisterMachine.instance.write_stdout(function)
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function.set_return ret
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function
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end
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def putint context
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putint_function = Vm::Function.new(:putint , Vm::Integer , [] , Vm::Integer )
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buffer = Vm::StringConstant.new(" ") # create a buffer
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context.object_space.add_object buffer # and save it (function local variable: a no no)
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int = putint_function.receiver
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moved_int = putint_function.new_local
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utoa = context.object_space.get_or_create_class(:Object).get_or_create_function(:utoa)
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putint_function.instance_eval do
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mov( moved_int , int ) # move arg up
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add( int , buffer ,nil ) # string to write to (add string address to pc)
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add( int , int , buffer.length - 3) # 3 for good measure , ahem.
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call( utoa )
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after = new_block("after_call")
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insert_at after
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# And now we "just" have to print it, using the write_stdout
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add( int , buffer , nil ) # string to write to
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mov( moved_int , buffer.length )
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end
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Vm::RegisterMachine.instance.write_stdout(putint_function)
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putint_function
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end
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# The conversion to base10 is quite a bit more complicated than i thought. The bulk of it is in div10
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# We set up variables, do the devision and write the result to the string
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# then check if were done and recurse if neccessary
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# As we write before we recurse (save a push) we write the number backwards
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# arguments: string address , integer
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def utoa context
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utoa_function = Vm::Function.new(:utoa , Vm::Integer , [ Vm::Integer ] , Vm::Integer )
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str_addr = utoa_function.receiver
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number = utoa_function.args.first
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remainder = utoa_function.new_local
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Vm::RegisterMachine.instance.div10( utoa_function , number , remainder )
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# make char out of digit (by using ascii encoding) 48 == "0"
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utoa_function.instance_eval do
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add( remainder , remainder , 48)
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strb( remainder, str_addr )
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sub( str_addr, str_addr , 1 )
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cmp( number , 0 )
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callne( utoa_function )
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end
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return utoa_function
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end
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# testing method, hand coded fibo, expects arg in 1
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# result comes in 7
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# a hand coded version of the fibonachi numbers
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# not my hand off course, found in the net from a basic introduction
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def fibo context
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fibo_function = Vm::Function.new(:fibo , Vm::Integer , [] , Vm::Integer )
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result = fibo_function.return_type
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int = fibo_function.receiver
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count = fibo_function.new_local
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f1 = fibo_function.new_local
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f2 = fibo_function.new_local
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fibo_function.instance_eval do
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cmp int , 1
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mov( result, int , condition_code: :le)
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mov( :pc , :lr , condition_code: :le)
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push [ count , f1 , f2 , :lr]
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mov f1 , 1
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mov f2 , 0
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sub count , int , 2
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end
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l = fibo_function.new_block("loop")
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fibo_function.insert_at l
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fibo_function.instance_eval do
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add f1 , f1 , f2
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sub f2 , f1 , f2
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sub count , count , 1 , set_update_status: 1
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bpl( l )
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mov( result , f1 )
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pop [ count , f1 , f2 , :pc]
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end
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fibo_function.set_return result
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fibo_function
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end
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end
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extend ClassMethods
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end
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end |