Torsten Rüger
9a2716280c
Since they were embedded at first (easier copy/paste) they now got own files, like their brethren also mini tests for each instruction , nice start
108 lines
3.9 KiB
Ruby
108 lines
3.9 KiB
Ruby
require_relative "get_internal_word"
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require_relative "set_internal_word"
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require_relative "method_missing"
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require_relative "init"
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require_relative "exit"
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module Mom
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module Builtin
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class Object
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module ClassMethods
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include CompileHelper
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# self[index] basically. Index is the first arg
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# return is stored in return_value
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def get_internal_word( context )
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compiler = compiler_for(:Object , :get_internal_word ,{at: :Integer})
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compiler.add_code GetInternalWord.new("get_internal_word")
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return compiler
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end
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# self[index] = val basically. Index is the first arg , value the second
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# return the value passed in
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def set_internal_word( context )
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compiler = compiler_for(:Object , :set_internal_word , {at: :Integer, value: :Object} )
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compiler.add_code SetInternalWord.new("set_internal_word")
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return compiler
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end
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# every object needs a method missing.
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# Even if it's just this one, sys_exit (later raise)
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def _method_missing( context )
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compiler = compiler_for(:Object,:method_missing ,{})
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compiler.add_code MethodMissing.new("missing")
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return compiler
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end
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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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# - load fist message, set up Space as receiver
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# - call main, ie set up message for that etc
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# - exit (exit_sequence) which passes a machine int out to c
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def __init__( context )
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compiler = Mom::MethodCompiler.compiler_for_class(:Object,:__init__ ,
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Parfait::NamedList.type_for({}) , Parfait::NamedList.type_for({}))
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compiler.add_code MethodMissing.new("missing")
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return compiler
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end
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# the exit function
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# mainly calls exit_sequence
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def exit( context )
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compiler = compiler_for(:Object,:exit ,{})
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compiler.add_code Exit.new("exit")
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return compiler
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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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# emit the syscall with given name
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# there is a Syscall instruction, but the message has to be saved and restored
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def self.emit_syscall( builder , name )
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save_message( builder )
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builder.add_code Risc::Syscall.new("emit_syscall(#{name})", name )
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restore_message(builder)
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return unless (@clazz and @method)
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builder.add_code Risc.label( "#{@clazz.name}.#{@message.name}" , "return_syscall" )
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end
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# a sort of inline version of exit method.
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# Used by exit and __init__ (so it doesn't have to call it)
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# Assumes int return value and extracts the fixnum for process exit code
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def self.exit_sequence(builder)
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save_message( builder )
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builder.build do
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message << message[:return_value]
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message.reduce_int
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add_code Risc::Syscall.new("emit_syscall(exit)", :exit )
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end
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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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# This relies on linux to save and restore all registers
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#
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def self.save_message(builder)
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r8 = Risc::RegisterValue.new( :r8 , :Message).set_builder(builder)
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builder.build {r8 << message}
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end
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# restore the message that we save in r8
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# before th restore, the syscall return, a fixnum, is saved
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# The caller of this method is assumed to caal prepare_int_return
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# so that the return value already has an integer instance
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# This instance is filled with os return value
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def self.restore_message(builder)
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r8 = Risc::RegisterValue.new( :r8 , :Message)
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builder.build do
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integer_reg! << message
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message << r8
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integer_2! << message[:return_value]
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integer_2[Parfait::Integer.integer_index] << integer_reg
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end
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end
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end
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end
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