82 lines
3.1 KiB
Ruby
82 lines
3.1 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
|
|
function = Vm::Function.new(:putstring , [Vm::Integer , Vm::Integer ] )
|
|
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
|
|
function = Vm::Function.new(:putint , [Vm::Integer , Vm::Integer ] )
|
|
block = function.body
|
|
buffer = Vm::StringConstant.new(" ")
|
|
context.program.add_object buffer
|
|
str_addr = Vm::Integer.new(0) # address of the
|
|
context.str_addr = str_addr
|
|
reg1 = Vm::Integer.new(1)
|
|
itos_fun = context.program.get_or_create_function(:utoa)
|
|
block.instance_eval do
|
|
mov( reg1 , str_addr ) #move arg up
|
|
add( str_addr , buffer ,nil ) # string to write to
|
|
add( str_addr , str_addr , (buffer.length-3))
|
|
call( itos_fun , {})
|
|
# And now we "just" have to print it, using the write_stdout
|
|
add( str_addr , buffer , nil ) # string to write to
|
|
mov( reg1 , buffer.length )
|
|
end
|
|
ret = Vm::CMachine.instance.write_stdout(block)
|
|
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
|
|
def utoa context
|
|
function = Vm::Function.new(:utoa , [Vm::Integer , Vm::Integer ] )
|
|
block = function.body
|
|
str_addr = context.str_addr
|
|
number = Vm::Integer.new(str_addr.register + 1)
|
|
remainder = Vm::Integer.new( number.register + 1)
|
|
Vm::CMachine.instance.div10( block , number , remainder )
|
|
# make char out of digit (by using ascii encoding) 48 == "0"
|
|
block.instance_eval do
|
|
add( remainder , remainder , 48 )
|
|
strb( remainder, right: str_addr )
|
|
sub( str_addr, str_addr , 1 )
|
|
cmp( number , 0 )
|
|
callne( function , {} )
|
|
end
|
|
return function
|
|
end
|
|
end
|
|
|
|
extend ClassMethods
|
|
end
|
|
end |