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