Class: HDLRuby::Low::Event

Inherits:
Base::Event
  • Object
show all
Includes:
Hparent, Low2Symbol
Defined in:
lib/HDLRuby/hruby_db.rb,
lib/HDLRuby/hruby_low.rb,
lib/HDLRuby/hruby_low2c.rb,
lib/HDLRuby/hruby_low2sym.rb,
lib/HDLRuby/hruby_low2vhd.rb,
lib/HDLRuby/hruby_low2high.rb,
lib/HDLRuby/hruby_low_mutable.rb,
lib/HDLRuby/hruby_low_skeleton.rb

Overview

Describes an event.

Direct Known Subclasses

High::Event

Constant Summary

Constants included from Low2Symbol

Low2Symbol::Low2SymbolPrefix, Low2Symbol::Low2SymbolTable, Low2Symbol::Symbol2LowTable

Instance Attribute Summary collapse

Attributes included from Hparent

#parent

Instance Method Summary collapse

Methods included from Low2Symbol

#to_sym

Methods included from Hparent

#scope

Constructor Details

#initialize(type, ref) ⇒ Event

Creates a new +type+ sort of event on signal refered by +ref+.



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# File 'lib/HDLRuby/hruby_low.rb', line 2208

def initialize(type,ref)
    # Check and set the type.
    @type = type.to_sym
    # Check and set the reference.
    unless ref.is_a?(Ref)
        raise AnyError, "Invalid class for a reference: #{ref.class}"
    end
    @ref = ref
    # And set the parent of ref.
    ref.parent = self
end

Instance Attribute Details

#ref ⇒ Object (readonly)

The reference of the event.



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# File 'lib/HDLRuby/hruby_low.rb', line 2205

def ref
  @ref
end

#type ⇒ Object (readonly)

The type of event.



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# File 'lib/HDLRuby/hruby_low.rb', line 2202

def type
  @type
end

Instance Method Details

#eql?(obj) ⇒ Boolean

Comparison for hash: structural comparison.



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# File 'lib/HDLRuby/hruby_low.rb', line 2221

def eql?(obj)
    return false unless obj.is_a?(Event)
    return false unless @type.eql?(obj.type)
    return false unless @ref.eql?(obj.ref)
    return true
end

#hash ⇒ Object

Hash function.



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# File 'lib/HDLRuby/hruby_low.rb', line 2229

def hash
    return [@type,@ref].hash
end

#on_edge? ⇒ Boolean

Tells if there is a positive or negative edge event.

NOTE: checks if the event type is :posedge or :negedge



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# File 'lib/HDLRuby/hruby_low.rb', line 2236

def on_edge?
    return (@type == :posedge or @type == :negedge)
end

#reassign_expressions!(node2reassign) ⇒ Object

Replace node by corresponding replacement from +node2reassign+ that is a table whose entries are: +node+ the node to replace +rep+ the replacement of the node +ref+ the reference where to reassign the node.



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# File 'lib/HDLRuby/hruby_low_mutable.rb', line 444

def reassign_expressions!(node2reassign)
    # Build the replacement table.
    node2rep = node2reassign.map {|n,r| [n,r[0]] }.to_h

    # Performs the replacement.
    node2rep_done = {} # The performed replacements.
    # Replace on the sons of the reference.
    node2rep_done.merge!(self.ref.replace_expressions!(node2rep))
    # Shall we replace the ref?
    rep = node2rep[self.ref]
    if rep then
        # Yes, do it.
        rep = rep.clone
        node = self.ref
        # node.set_parent!(nil)
        self.set_ref!(rep)
        node2rep_done[node] = rep
    end

    # Assign the replaced nodes.
    node2rep_done.each do |node,rep|
        reassign = node2reassign[node][1].clone
        self.parent.parent.
            add_connection(Connection.new(reassign,node.clone))
    end
end

#set_ref!(ref) ⇒ Object

Sets the reference to +ref+.



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# File 'lib/HDLRuby/hruby_low_mutable.rb', line 431

def set_ref!(ref)
    # Check and set the reference.
    unless ref.is_a?(Ref)
        raise AnyError, "Invalid class for a reference: #{ref.class}"
    end
    @ref = ref
end

#set_type!(type) ⇒ Object

Sets the type.



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# File 'lib/HDLRuby/hruby_low_mutable.rb', line 425

def set_type!(type)
    # Check and set the type.
    @type = type.to_sym
end

#to_c(level = 0) ⇒ Object

Generates the C text of the equivalent HDLRuby::High code. +level+ is the hierachical level of the object.



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# File 'lib/HDLRuby/hruby_low2c.rb', line 724

def to_c(level = 0)
    edge = "ANYEDGE"
    edge = "POSEDGE" if self.type == :posedge
    edge = "NEGEDGE" if self.type == :negedge
    return "make_event(#{edge}," +
           "#{self.ref.resolve.to_c_signal(level+1)})"
end

#to_high(level = 0) ⇒ Object

Generates the text of the equivalent HDLRuby::High code. +level+ is the hierachical level of the object.



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# File 'lib/HDLRuby/hruby_low2high.rb', line 293

def to_high(level = 0)
    return self.ref.to_high(level) + ".#{self.type}"
end