76 lines
2.0 KiB
Ruby
76 lines
2.0 KiB
Ruby
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require_relative "function"
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require_relative "function_call"
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require "arm/arm_machine"
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module Vm
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# A Program represents an executable that we want to build
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# it has a list of functions and (global) objects
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# The main entry is a function called (of all things) "main", This _must be supplied by the compling
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# There is a start and exit block that call main, which receives an array of strings
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# While data "ususally" would live in a .data section, we may also "inline" it into the code
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# in an oo system all data is represented as objects
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# in terms of variables and their visibility, things are simple. They are either local or global
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# throwing in a context for unspecified use (well one is to pass the programm/globals around)
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class Program < Block
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# should init for a machine and pass that on to start/exit / register alloc and the like
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def initialize
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super("start")
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# this aint pretty. but i'll go soon enough
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Machine.instance = Arm::ArmMachine.new
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@context = Context.new(self)
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@functions = []
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@objects = []
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@entry = Vm::Kernel::start
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@exit = Vm::Kernel::exit
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end
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attr_reader :context
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def add_object o
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@objects << o # TODO check type , no basic values allowed (must be wrapped)
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end
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def get_function name
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@functions.detect{ |f| f.name == name }
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end
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# preferred way of creating new functions (also forward declarations, will flag unresolved later)
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def get_or_create_function name
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fun = get_function name
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unless fun
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fun = Function.new(name)
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@functions << fun
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end
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fun
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end
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def compile
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super
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string_table
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end
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def wrap_as_main value
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end
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def verify
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main = @functions.find{|f| f.name == "main"}
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raise "No main in Program" unless main
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@functions.each do |funct|
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funct.verify
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end
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end
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private
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# the main function
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def create_main
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end
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end
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end
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