97b4c469f8
and their use Arm is confusing as it has result as first arg we use forward logic, i.e. from -> to
80 lines
3.8 KiB
Ruby
80 lines
3.8 KiB
Ruby
module Builtin
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module Kernel
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module ClassMethods
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# this is the really really first place the machine starts (apart from the jump here)
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# it isn't really a function, ie it is jumped to (not called), exits and may not return
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# so it is responsible for initial setup
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def __init__ context
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function = Virtual::CompiledMethodInfo.create_method(:Kernel,:__init__ , [])
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function.info.return_type = Virtual::Integer
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# no method enter or return (automatically added), remove
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function.info.blocks.first.codes.pop # no Method enter
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function.info.blocks.last.codes.pop # no Method return
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#Set up the Space as self upon init
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space = Parfait::Space.object_space
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function.info.add_code Register::LoadConstant.new( space , Virtual::Slot::SELF_REGISTER)
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message_ind = space.get_layout().index_of( :next_message )
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# Load the message to message register (0)
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function.info.add_code Register::GetSlot.new( Virtual::Slot::SELF_REGISTER , message_ind , Virtual::Slot::MESSAGE_REGISTER)
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# now we are set up to issue a call to the main
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function.info.add_code Virtual::MethodCall.new(Virtual.machine.space.get_main)
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emit_syscall( function , :exit )
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return function
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end
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def putstring context
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function = Virtual::CompiledMethodInfo.create_method(:Kernel , :putstring , [] )
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emit_syscall( function , :putstring )
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function
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end
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def exit context
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function = Virtual::CompiledMethodInfo.create_method(:Kernel,:exit , [])
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function.info.return_type = Virtual::Integer
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return function
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ret = Virtual::RegisterMachine.instance.exit(function)
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function.set_return ret
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function
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end
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def __send context
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function = Virtual::CompiledMethodInfo.create_method(:Kernel ,:__send , [] )
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function.info.return_type = Virtual::Integer
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return function
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end
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private
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def emit_syscall function , name
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save_message( function )
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function.info.add_code Register::Syscall.new( name )
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restore_message(function)
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end
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# save the current message, as the syscall destroys all context
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#
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# currently HACKED into the space as a temporary varaible. As the space is a globally
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# unique object we can retrieve it from there
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# TODO : fix this to use global (later per thread) variable
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def save_message(function)
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space_tmp = Register::RegisterReference.tmp_reg
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ind = Parfait::Space.object_space.get_layout().index_of( :syscall_message )
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raise "index not found for :syscall_message" unless ind
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function.info.add_code Register::LoadConstant.new( Parfait::Space.object_space , space_tmp)
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function.info.add_code Register::SetSlot.new( Virtual::Slot::MESSAGE_REGISTER , space_tmp , ind)
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end
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def restore_message(function)
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# get the sys return out of the way
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return_tmp = Register::RegisterReference.tmp_reg
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# load the space into the base register
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function.info.add_code Register::RegisterTransfer.new( return_tmp , Virtual::Slot::MESSAGE_REGISTER )
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slot = Virtual::Slot
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# find the stored message
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ind = Parfait::Space.object_space.get_layout().index_of( :syscall_message )
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raise "index not found for #{kind}.#{kind.class}" unless ind
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# and load it into the base RegisterMachine
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function.info.add_code Register::GetSlot.new( slot::MESSAGE_REGISTER , ind , slot::MESSAGE_REGISTER )
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# and "unroll" self and frame
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function.info.add_code Register::GetSlot.new( slot::MESSAGE_REGISTER , Virtual::SELF_INDEX, slot::SELF_REGISTER )
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function.info.add_code Register::GetSlot.new( slot::MESSAGE_REGISTER , Virtual::FRAME_INDEX, slot::FRAME_REGISTER )
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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
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