Class: Origen::Registers::Placeholder

Inherits:
Object
  • Object
show all
Defined in:
lib/origen/registers.rb

Overview

Instantiating registers can be quite expensive, this object is a placeholder for a register and will transform into one automatically when it is required to (i.e. whenever a register method is called on it).

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(owner, name, attributes) ⇒ Placeholder

Returns a new instance of Placeholder.



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# File 'lib/origen/registers.rb', line 138

def initialize(owner, name, attributes)
  @owner = owner
  @name = name
  @attributes = attributes
  @feature = attributes[:_feature] if attributes.key?(:_feature)

  # Give reg.new a way to tell if coming from Placeholder
  if attributes[:bit_info].is_a? Hash
    attributes[:bit_info][:from_placeholder] = true
  end
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(method, *args, &block) ⇒ Object 



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# File 'lib/origen/registers.rb', line 254

def method_missing(method, *args, &block)
  materialize.send(method, *args, &block)
end

Instance Attribute Details

#attributes ⇒ Object (readonly)

Returns the value of attribute attributes.



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# File 'lib/origen/registers.rb', line 135

def attributes
  @attributes
end

#feature ⇒ Object (readonly)

Returns the value of attribute feature.



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# File 'lib/origen/registers.rb', line 135

def feature
  @feature
end

#name ⇒ Object (readonly) Also known as: id

Returns the value of attribute name.



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# File 'lib/origen/registers.rb', line 135

def name
  @name
end

#owner ⇒ Object (readonly)

Returns the value of attribute owner.



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# File 'lib/origen/registers.rb', line 135

def owner
  @owner
end

Instance Method Details

#clone ⇒ Object 



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# File 'lib/origen/registers.rb', line 266

def clone
  materialize.clone
end

#contains_bits? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/origen/registers.rb', line 274

def contains_bits?
  true
end

#dup ⇒ Object 



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# File 'lib/origen/registers.rb', line 270

def dup
  materialize.dup
end

#enabled? ⇒ Boolean

Returns true if the register is enabled by a feature of owner.

Returns:

  • (Boolean) 


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# File 'lib/origen/registers.rb', line 157

def enabled?
  if feature
    value = false
    current_owner = self
    if feature.class == Array
      feature.each do |f|
        current_owner = self
        loop do
          if current_owner.respond_to?(:owner)
            current_owner = current_owner.owner
            if current_owner.respond_to?(:has_feature?)
              if current_owner.has_feature?(f)
                value = true
                break
              end
            end
          else # if current owner does not have a owner
            value = false
            break
          end
        end # loop end
        unless value
          if Origen.top_level && \
             Origen.top_level.respond_to?(:has_feature?) && \
             Origen.top_level.has_feature?(f)
            value = true
            unless value
              break
            end
          end
        end
        unless value
          break # break if feature not found and return false
        end
      end # iterated through all features in array
      return value
    else # if feature.class != Array
      loop do
        if current_owner.respond_to?(:owner)
          current_owner = current_owner.owner
          if current_owner.respond_to?(:has_feature?)
            if current_owner.has_feature?(feature)
              value = true
              break
            end
          end
        else # if current owner does not have a owner
          value = false
          break
        end
      end # loop end
      unless value
        if Origen.top_level && \
           Origen.top_level.respond_to?(:has_feature?) && \
           Origen.top_level.has_feature?(feature)
          value = true
        end
      end
      return value
    end
  else
    return true
  end
end

#enabled_by_feature?(name = nil) ⇒ Boolean Also known as: has_feature_constraint?

Returns true if the register is constrained by the given/any feature

Returns:

  • (Boolean) 


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# File 'lib/origen/registers.rb', line 223

def enabled_by_feature?(name = nil)
  if !name
    !!feature
  else
    if feature.class == Array
      feature.each do |f|
        if f == name
          return true
        end
      end
      return false
    else
      return feature == name
    end
  end
end

#freeze ⇒ Object 



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# File 'lib/origen/registers.rb', line 250

def freeze
  materialize.freeze
end

#inspect ⇒ Object

Make it look like a reg in the console to avoid confusion



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# File 'lib/origen/registers.rb', line 242

def inspect
  materialize.inspect
end

#is_a?(klass) ⇒ Boolean

Make this appear like a reg to any application code

Returns:

  • (Boolean) 


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# File 'lib/origen/registers.rb', line 151

def is_a?(klass)
  klass == Origen::Registers::Reg ||
    klass == self.class
end

#materialize ⇒ Object 



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# File 'lib/origen/registers.rb', line 262

def materialize
  owner.instantiate_reg(name, attributes)
end

#reset ⇒ Object

Don’t need to act on reset, an un-materialized reg is by default already reset



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# File 'lib/origen/registers.rb', line 247

def reset
end

#respond_to?(method, include_private = false) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/origen/registers.rb', line 258

def respond_to?(method, include_private = false)
  materialize.respond_to?(method, include_private)
end

#to_json(*args) ⇒ Object 



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# File 'lib/origen/registers.rb', line 278

def to_json(*args)
  materialize.to_json(*args)
end