114 lines
4.4 KiB
Ruby
114 lines
4.4 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 main_start block
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#TODO extract args into array of strings
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Vm::RegisterMachine.instance.main_start block
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block
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end
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def main_exit block
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# Machine.exit mov r7 , 0 + swi 0
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Vm::RegisterMachine.instance.main_exit block
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block
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end
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def function_entry block , f_name
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Vm::RegisterMachine.instance.function_entry block , f_name
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end
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def function_exit block , f_name
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Vm::RegisterMachine.instance.function_exit block , f_name
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end
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#TODO this is in the wrong place. It is a function that returns a function object
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# while all other methods add their code into some block. --> kernel
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def putstring context , string = Vm::Integer , length = Vm::Integer
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function = Vm::Function.new(:putstring , [string , length ] , string)
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block = function.body
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# should be another level of indirection, ie write(io,str)
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ret = Vm::RegisterMachine.instance.write_stdout(block)
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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 , arg = Vm::Integer
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putint_function = Vm::Function.new(:putint , [arg] , arg )
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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.args.first
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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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b = putint_function.body
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b.mov( moved_int , int ) #move arg up
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#b.a buffer => int # string to write to
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b.add( int , buffer ,nil ) # string to write to
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b.a int + (buffer.length-3) => int
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b.call( utoa )
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# And now we "just" have to print it, using the write_stdout
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b.add( int , buffer , nil ) # string to write to
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b.mov( moved_int , buffer.length )
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Vm::RegisterMachine.instance.write_stdout(putint_function.body)
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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.args[0]
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number = utoa_function.args[1]
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remainder = utoa_function.new_local
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Vm::RegisterMachine.instance.div10( utoa_function.body , number , remainder )
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# make char out of digit (by using ascii encoding) 48 == "0"
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b = utoa_function.body.scope binding
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b.remainder = remainder + 48
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b.strb( remainder, str_addr )
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b.sub( str_addr, str_addr , 1 )
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b.cmp( number , 0 )
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b.callne( utoa_function )
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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 = Vm::Integer.new(7)
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int = fibo_function.args[0]
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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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b = fibo_function.body.scope binding
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b.a int == 1
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b.mov( result, int , condition_code: :le)
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b.mov( :pc , :lr , condition_code: :le)
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b.push [ count , f1 , f2 , :lr]
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b.f1 = 1
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b.f2 = 0
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b.count = int - 2
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l = fibo_function.body.new_block("loop").scope binding
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l.f1 = f1 + f2
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l.f2 = f1 - f2
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l.count = (count - 1).set_update_status
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l.bpl( l )
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l.mov( result , f1 )
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fibo_function.set_return result
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l.pop [ count , f1 , f2 , :pc]
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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 |