80 lines
3.2 KiB
Ruby
80 lines
3.2 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 main_start block
|
|
#TODO extract args into array of strings
|
|
Vm::CMachine.instance.main_start block
|
|
block
|
|
end
|
|
def main_exit block
|
|
# Machine.exit mov r7 , 0 + swi 0
|
|
Vm::CMachine.instance.main_exit block
|
|
block
|
|
end
|
|
def function_entry block , f_name
|
|
Vm::CMachine.instance.function_entry block , f_name
|
|
end
|
|
def function_exit block , f_name
|
|
Vm::CMachine.instance.function_exit block , f_name
|
|
end
|
|
|
|
#TODO this is in the wrong place. It is a function that returns a function object
|
|
# while all other methods add their code into some block. --> kernel
|
|
def putstring context , string = Vm::Integer , length = Vm::Integer
|
|
function = Vm::Function.new(:putstring , [string , length ] , string)
|
|
block = function.body
|
|
# should be another level of indirection, ie write(io,str)
|
|
ret = Vm::CMachine.instance.write_stdout(block)
|
|
function.return_type = ret
|
|
function
|
|
end
|
|
|
|
def putint context , arg = Vm::Integer
|
|
putint_function = Vm::Function.new(:putint , [arg] , arg )
|
|
buffer = Vm::StringConstant.new(" ") # create a buffer
|
|
context.program.add_object buffer # and save it (function local variable: a no no)
|
|
int = putint_function.args.first
|
|
moved_int = Vm::Integer.new(1)
|
|
utoa = context.program.get_or_create_function(:utoa)
|
|
b = putint_function.body
|
|
b.mov( moved_int , int ) #move arg up
|
|
#b.a buffer => int # string to write to
|
|
|
|
b.add( int , buffer ,nil ) # string to write to
|
|
b.a int + (buffer.length-3) => int
|
|
b.call( utoa )
|
|
# And now we "just" have to print it, using the write_stdout
|
|
b.add( int , buffer , nil ) # string to write to
|
|
b.mov( moved_int , buffer.length )
|
|
Vm::CMachine.instance.write_stdout(putint_function.body)
|
|
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.args[0]
|
|
number = utoa_function.args[1]
|
|
remainder = Vm::Integer.new( number.register + 1)
|
|
Vm::CMachine.instance.div10( utoa_function.body , number , remainder )
|
|
# make char out of digit (by using ascii encoding) 48 == "0"
|
|
b = utoa_function.body
|
|
b.a remainder + 48 => remainder
|
|
b.strb( remainder, right: str_addr )
|
|
b.sub( str_addr, str_addr , 1 )
|
|
b.cmp( number , 0 )
|
|
b.callne( utoa_function )
|
|
return utoa_function
|
|
end
|
|
end
|
|
|
|
extend ClassMethods
|
|
end
|
|
end |