Class: HDLRuby::Low::Connection

Inherits:
Transmit show all
Defined in:
lib/HDLRuby/hruby_db.rb,
lib/HDLRuby/hruby_low.rb,
lib/HDLRuby/hruby_low2c.rb,
lib/HDLRuby/hruby_low2vhd.rb,
lib/HDLRuby/hruby_verilog.rb,
lib/HDLRuby/hruby_low2high.rb,
lib/HDLRuby/hruby_low_mutable.rb,
lib/HDLRuby/hruby_low_skeleton.rb,
lib/HDLRuby/hruby_low_fix_types.rb

Overview

Extends the Connection class with fixing of types and constants.

Direct Known Subclasses

High::Connection

Constant Summary

Constants included from Low2Symbol

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

Instance Attribute Summary

Attributes inherited from Transmit

#left, #right

Attributes included from Hparent

#parent

Instance Method Summary collapse

Methods inherited from Transmit

#boolean_in_assign2select!, #break_concat_assigns, #clone, #each_block, #each_block_deep, #each_node, #each_node_deep, #each_statement_deep, #explicit_types!, #extract_selects!, #initialize, #map_nodes!, #replace_expressions!, #set_left!, #set_right!, #to_c, #to_high, #to_vhdl

Methods inherited from Statement

#add_blocks_code, #block, #blocks2seq!, #break_types!, #clone, #delete_unless!, #explicit_types!, #extract_declares!, #mix?, #replace_expressions!, #replace_names!, #to_c, #to_high, #to_upper_space!, #to_vhdl, #top_block, #top_scope, #with_boolean!

Methods included from Low2Symbol

#to_sym

Constructor Details

This class inherits a constructor from HDLRuby::Low::Transmit

Instance Method Details

#array_connection(left, right) ⇒ Object

Method used for array.



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# File 'lib/HDLRuby/hruby_verilog.rb', line 1443

def array_connection(left,right)
    expression = right.each_expression.to_a
    result = ""
    expression[0..-2].each do |expression|
        result << "   assign #{left.to_verilog}[#{expression.content.to_s}] = #{expression.to_verilog};\n"
    end
    result << "   assign #{left.to_verilog}[#{expression.last.content.to_s}] = #{expression.last.to_verilog};\n"
    return result
end

#eql?(obj) ⇒ Boolean

Comparison for hash: structural comparison.

Returns:

  • (Boolean) 


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# File 'lib/HDLRuby/hruby_low.rb', line 3638

def eql?(obj)
    return false unless obj.is_a?(Connection)
    return super(obj)
end

#hash ⇒ Object

Hash function.



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# File 'lib/HDLRuby/hruby_low.rb', line 3644

def hash
    return super
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 1135

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

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

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

#to_verilog ⇒ Object 



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# File 'lib/HDLRuby/hruby_verilog.rb', line 1453

def to_verilog
    # Decide whether to assign to array by if.
    # NOTICE: Now array assignment is done trough constant initialization, will be treated later.
    # if self.right.respond_to? (:each_expression) 
    #   array_connection(self.left,self.right);
    # else
    cnt = 0  # Use count.
    bit = -2 # Used to determine the bit width. Since there are 0 and default, -2.

    # Measure the number of choices on the right side (case statement if it is 3 or more).
    if self.right.respond_to? (:each_choice)
        choice = self.right.each_choice.to_a
        choice.each do |choice|
            bit += 1
        end
    end

    # Three or more choices.
    if (bit > 2)
        # The bit width is obtained by converting the bit into a binary number and obtaining the size.
        bit = bit.to_s(2).size

        # Create a case statement.
        result = "   begin\n"
        result << "      case(#{self.right.select.to_verilog})\n"
        # Output other than the last one in order.
        choice[0..-2].each do |choice|
            result << "         #{bit}'#{cnt}: #{self.left.to_verilog} = #{choice.to_verilog}\n"
            cnt += 1
        end
        # At the end, it becomes default because it needs default.
        result << "         default: #{self.left.to_verilog} = #{choice.last.to_verilog}\n"
        result << "      endcase\n"
        result << "   end\n"
        return result
    end

    # It is not a case so call it normally.
    return "   assign #{self.left.to_verilog} = #{self.right.to_verilog};\n"
    # end
end