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