108 lines
3.5 KiB
Ruby
108 lines
3.5 KiB
Ruby
module Risc
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# Positions are very different during compilation and run-time.
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# At run-time they are inherrent to the object, and fixed.
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# While during compilation we can move things about, and do not use the
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# objects memory position at all.
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#
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# Furthermore, there are differnet kind of positions during compilation.
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# Off course the object position as hinted above, but also instruction
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# positions, that do not reflect the position of the object, but of the
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# assembled instruction in the binary.
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#
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# The Position module keeps a hash of all compile time positions.
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#
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# While the (different)Position objects transmit the change that (re) positioning
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# entails to affected objects.
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module Position
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include Util::Logging
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log_level :info
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@positions = {}
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@reverse_cache = {}
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def self.positions
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@positions
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end
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def self.clear_positions
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@positions = {}
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@reverse_cache = {}
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end
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def self.at( int )
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@reverse_cache[int]
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end
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def self.set?(object)
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self.positions.has_key?(object)
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end
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def self.get(object)
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pos = self.positions[object]
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if pos == nil
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str = "position accessed but not set, "
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str += "0x#{object.object_id.to_s(16)}\n"
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str += "for #{object.class} "
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str += "byte_length #{object.byte_length}" if object.respond_to?(:byte_length)
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str += " for #{object.to_s[0...130]}"
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raise str
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end
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pos
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end
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def self.reset(obj)
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old = self.get(obj)
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old.reset_to( old.at )
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end
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# resetting of position used to be error, but since relink and dynamic instruction size it is ok.
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# in measures
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#
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# reseting to the same position as before, triggers code that propagates
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def self.reset(position , to , extra)
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log.debug "ReSetting #{position}, to:#{to.to_s(16)}, for #{position.object.class}-#{position.object}"
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position.reset_to(to, extra)
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if testing = @reverse_cache[ to ]
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if testing.class != position.class
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raise "Mismatch (at #{to.to_s(16)}) new:#{position}:#{position.class} , was #{testing}:#{testing.class}"
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end
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end
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unless position.object.is_a? Label
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@reverse_cache.delete(to)
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@reverse_cache[position.at] = position
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end
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log.debug "Reset #{position} (#{to.to_s(16)}) for #{position.class}"
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return position
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end
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def self.set( object , pos , extra = nil)
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old = Position.positions[object]
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return self.reset(old , pos , extra) if old
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log.debug "Setting #{pos.to_s(16)} for #{object.class}-#{object}"
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testing = self.at( pos )
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position = for_at( object , pos , extra)
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raise "Mismatch (at #{pos.to_s(16)}) was:#{position} #{position.class} #{position.object} , should #{testing}#{testing.class}" if testing and testing.class != position.class
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self.positions[object] = position
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position.init(pos , extra)
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@reverse_cache[position.at] = position unless object.is_a? Label
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log.debug "Set #{position} (#{pos.to_s(16)}) for #{position.class}"
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position
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end
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def self.for_at(object , at , extra)
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case object
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when Parfait::BinaryCode
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CodePosition.new(object,at , extra)
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when Arm::Instruction , Risc::Instruction
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InstructionPosition.new(object,at , extra)
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else
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ObjectPosition.new(object,at)
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end
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end
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end
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end
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require_relative "position/object_position"
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require_relative "position/instruction_position"
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require_relative "position/code_position"
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