Class: HDLRuby::Low::RefName

Inherits:
Ref show all
Defined in:
lib/HDLRuby/hruby_low.rb,
lib/HDLRuby/hruby_low2c.rb,
lib/HDLRuby/hruby_low2hdr.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_resolve.rb,
lib/HDLRuby/hruby_low_skeleton.rb,
lib/HDLRuby/hruby_low_fix_types.rb,
lib/HDLRuby/hruby_low_bool2select.rb,
lib/HDLRuby/hruby_low_without_subsignals.rb,
lib/HDLRuby/hruby_low_casts_without_expression.rb

Overview

Describes a name reference.

Direct Known Subclasses

High::RefName

Constant Summary

Constants included from Low2Symbol

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

Instance Attribute Summary collapse

Attributes inherited from Expression

#type

Attributes included from Hparent

#parent

Instance Method Summary collapse

Methods inherited from Expression

#boolean?, #break_types!, #each_ref_deep, #extract_selects_to!, #immutable?, #leftvalue?, #replace_names!, #rightvalue?, #set_type!, #statement, #to_c_expr

Methods included from Low2Symbol

#to_sym

Methods included from Hparent

#hierarchy, #no_parent!, #scope

Constructor Details

#initialize(type, ref, name) ⇒ RefName

Create a new named reference with +type+ accessing +ref+ with +name+. def initialize(ref,name)



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# File 'lib/HDLRuby/hruby_low.rb', line 6022

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

Instance Attribute Details

#name ⇒ Object (readonly)

The access name.



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# File 'lib/HDLRuby/hruby_low.rb', line 6018

def name
  @name
end

#ref ⇒ Object (readonly)

The accessed reference.



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# File 'lib/HDLRuby/hruby_low.rb', line 6015

def ref
  @ref
end

Instance Method Details

#ancestor(my) ⇒ Object 



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# File 'lib/HDLRuby/hruby_verilog.rb', line 1467

def ancestor(my)
    if my.parent.parent.respond_to? (:mode) then
        return ancestor(my.parent)
    else
        return "#{my.parent.mode.to_s}#{my.mode.to_s}"
    end
end

#boolean_in_assign2select ⇒ Object

Converts booleans in assignments to select operators.



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# File 'lib/HDLRuby/hruby_low_bool2select.rb', line 339

def boolean_in_assign2select
    # Recurse on the sub references.
    return RefName.new(self.type,
                       self.ref.boolean_in_assign2select,
                       self.name)
end

#casts_without_expression! ⇒ Object

Extracts the expressions from the casts.



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# File 'lib/HDLRuby/hruby_low_casts_without_expression.rb', line 352

def casts_without_expression!
    # Recurse on the sub references.
    # return RefName.new(self.type,
    #                    self.ref.casts_without_expression,
    #                    self.name)
    self.set_ref!(self.ref.casts_without_expression!)
    return self
end

#clone ⇒ Object

Clones the name references (deeply)



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# File 'lib/HDLRuby/hruby_low.rb', line 6113

def clone
    return RefName.new(@type, @ref.clone, @name)
end

#each_deep(&ruby_block) ⇒ Object

Iterates over each object deeply.

Returns an enumerator if no ruby block is given.



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# File 'lib/HDLRuby/hruby_low.rb', line 6038

def each_deep(&ruby_block)
    # No ruby block? Return an enumerator.
    return to_enum(:each_deep) unless ruby_block
    # A ruby block? First apply it to current.
    ruby_block.call(self)
    # Then apply on the type.
    self.type.each_deep(&ruby_block)
    # Then apply on the reference.
    self.ref.each_deep(&ruby_block)
end

#each_node(&ruby_block) ⇒ Object Also known as: each_expression

Iterates over the reference children if any.



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# File 'lib/HDLRuby/hruby_low.rb', line 6085

def each_node(&ruby_block)
    # No ruby block? Return an enumerator.
    return to_enum(:each_node) unless ruby_block
    # A ruby block? Apply it on the child.
    ruby_block.call(@ref)
end

#each_node_deep(&ruby_block) ⇒ Object

Iterates over the nodes deeply if any.



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# File 'lib/HDLRuby/hruby_low.rb', line 6095

def each_node_deep(&ruby_block)
    # No ruby block? Return an enumerator.
    return to_enum(:each_node_deep) unless ruby_block
    # A ruby block? First apply it to current.
    ruby_block.call(self)
    # And recurse on the child.
    @ref.each_node_deep(&ruby_block)
end

#eql?(obj) ⇒ Boolean

Comparison for hash: structural comparison.

Returns:

  • (Boolean) 


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# File 'lib/HDLRuby/hruby_low.rb', line 6057

def eql?(obj)
    # General comparison.
    return false unless super(obj)
    # Specific comparison.
    return false unless obj.is_a?(RefName)
    return false unless @name.eql?(obj.name)
    return false unless @ref.eql?(obj.ref)
    return true
end

#explicit_types(type = nil) ⇒ Object

Explicit the types conversions in the index ref where +type+ is the expected type of the condition if any.



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# File 'lib/HDLRuby/hruby_low_fix_types.rb', line 478

def explicit_types(type = nil)
    # Is there a type to match, if not use current one.
    type = self.type unless type
    # Cast if required and return the new reference.
    if self.type.eql?(type) then
        # No need to cast.
        return RefName.new(type,self.ref.explicit_types,self.name)
    else
        # Need a cast.
        return Cast.new(type,
           RefName.new(self.type,self.ref.explicit_types,self.name))
    end
end

#flatten ⇒ Object

Flatten the current ref to a list of references. If the reference is not heirachical, returns an empty list.



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# File 'lib/HDLRuby/hruby_low_without_subsignals.rb', line 249

def flatten
    subrefs = []
    self.flatten_to(self.resolve,subrefs)
    return subrefs
end

#flatten_to(sig, subrefs) ⇒ Object

Flatten a reference to a list of reference to leaf signals from signal +sig+ and add to result to +subrefs+



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# File 'lib/HDLRuby/hruby_low_without_subsignals.rb', line 231

def flatten_to(sig,subrefs)
    # puts "flatten_to with sig name=#{sig.name}"
    # Work on the sub signals if any.
    sig.each_signal do |sub|
        # Create a reference for the sub.
        subref = RefName.new(sub.type,self.clone,sub.name)
        # Recruse on it.
        subref.flatten_to(sub,subrefs)
        # Was it a leaf?
        unless sub.each_signal.any? then
            # Yes, add its new ref to the list of subs.
            subrefs << subref
        end
    end
end

#from_systemI? ⇒ Boolean

Tells if it is a reference to a systemI signal.

Returns:

  • (Boolean) 


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# File 'lib/HDLRuby/hruby_low_resolve.rb', line 179

def from_systemI?
    # Look for the owner from the name hierarchy.
    if self.ref.is_a?(RefName) then
        # Look in the parent hierachy for the sub reference name.
        parent = self.parent
        # puts "self.ref.name=#{self.ref.name}"
        while parent
            # puts "parent=#{parent}"
            if parent.respond_to?(:get_by_name) then
                found = parent.get_by_name(self.ref.name)
                # puts "found is a :#{found.class}"
                return found.is_a?(SystemI) if found
            end
            parent = parent.parent
        end
        # Not found, look further in the reference hierarchy.
        return self.ref.from_systemI?
    end
    # Not from a systemI.
    # puts "Not from systemI for #{self.name}"
    return false
end

#full_name ⇒ Object

Get the full name of the reference, i.e. including the sub ref names if any.



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# File 'lib/HDLRuby/hruby_low.rb', line 6051

def full_name
    name = self.ref.respond_to?(:full_name) ? self.ref.full_name : :""
    return :"#{name}::#{self.name}"
end

#get_systemI ⇒ Object

Gets the systemI the reference comes from if any.



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# File 'lib/HDLRuby/hruby_low_resolve.rb', line 203

def get_systemI
    # Look for the owner from the name hierarchy.
    if self.ref.is_a?(RefName) then
        # Look in the parent hierachy for the sub reference name.
        parent = self.parent
        # puts "self.ref.name=#{self.ref.name}"
        while parent
            # puts "parent=#{parent}"
            if parent.respond_to?(:get_by_name) then
                found = parent.get_by_name(self.ref.name)
                # puts "found is a :#{found.class}"
                return found if found.is_a?(SystemI)
            end
            parent = parent.parent
        end
        # Not found, look further in the reference hierarchy.
        return self.ref.get_systemI
    end
    # Not from a systemI.
    # puts "Not from systemI for #{self.name}"
    return nil
end

#hash ⇒ Object

Hash function.



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# File 'lib/HDLRuby/hruby_low.rb', line 6068

def hash
    return [super,@name,@ref].hash
end

#map_nodes!(&ruby_block) ⇒ Object Also known as: map_expressions!

Maps on the children.



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# File 'lib/HDLRuby/hruby_low_mutable.rb', line 1895

def map_nodes!(&ruby_block)
    @ref = ruby_block.call(@ref)
    @ref.parent = self unless @ref.parent
end

#path_each(&ruby_block) ⇒ Object

Iterates over the names of the path indicated by the reference.

Returns an enumerator if no ruby block is given.



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# File 'lib/HDLRuby/hruby_low.rb', line 6075

def path_each(&ruby_block)
    # No ruby block? Return an enumerator.
    return to_enum(:path_each) unless ruby_block
    # Recurse on the base reference.
    ref.path_each(&ruby_block)
    # Applies the block on the current name.
    ruby_block.call(@name)
end

#replace_expressions!(node2rep) ⇒ Object

Replaces sub expressions using +node2rep+ table indicating the node to replace and the corresponding replacement. Returns the actually replaced nodes and their corresponding replacement.

NOTE: the replacement is duplicated.



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# File 'lib/HDLRuby/hruby_low_mutable.rb', line 1908

def replace_expressions!(node2rep)
    # First recurse on the ref.
    res = self.ref.replace_expressions!(node2rep)
    
    # Is there a replacement to on 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)
        # And register the replacement.
        res[node] = rep
    end
    return res
end

#resolve ⇒ Object

Resolves the name of the reference and return the corresponding object. NOTE: return nil if could not resolve.



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# File 'lib/HDLRuby/hruby_low_resolve.rb', line 230

def resolve
    # puts "Resolve with #{self} and name=#{self.name} and ref=#{self.ref.class}"
    # First resolve the sub reference if possible.
    if self.ref.is_a?(RefName) then
        obj = self.ref.resolve
        # puts "obj=#{obj}"
        # Look into the object for the name.
        return obj.get_by_name(self.name)
    else
        # Look in the parent hierachy for the name.
        parent = self.parent
        # puts "parent=#{parent}"
        while parent
            # puts "parent=#{parent}"
            if parent.respond_to?(:get_by_name) then
                # puts "get_by_name"
                found = parent.get_by_name(self.name)
                # puts "found" if found
                return found if found
            end
            parent = parent.parent
        end
        # Not found.
        puts "Not found!"
        return nil
    end
end

#set_name!(name) ⇒ Object

Sets the name.



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# File 'lib/HDLRuby/hruby_low_mutable.rb', line 1889

def set_name!(name)
    # Check and set the symbol.
    @name = name.to_sym
end

#set_ref!(ref) ⇒ Object

Sets the base reference.



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# File 'lib/HDLRuby/hruby_low_mutable.rb', line 1878

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

#signal2subs! ⇒ Object

Decompose the hierarchical signals in the statements.



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# File 'lib/HDLRuby/hruby_low_without_subsignals.rb', line 256

def signal2subs!
    # puts "signal2subs! for RefName: #{self.name}"
    # Decompose it to a list of reference to each leaf sub signal.
    subrefs = []
    self.flatten_to(self.resolve,subrefs)
    # puts "subrefs=#{subrefs.map{|subref| subref.name}}"
    # Has it sub signals?
    if (subrefs.any?) then
        # Yes, convert it to a Concat.
        if self.leftvalue? then
            return RefConcat.new(self.type,subrefs)
        else
            return Concat.new(self.type,subrefs)
        end
    else
        # Nothing to do.
        return self
    end
end

#to_another_verilog ⇒ Object

Used for instantiation (emergency procedure).



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# File 'lib/HDLRuby/hruby_verilog.rb', line 1463

def to_another_verilog
    return "_#{self.name.to_s}"
end

#to_c(res, level = 0, left = false) ⇒ Object

Generates the C text of the equivalent HDLRuby code. +level+ is the hierachical level of the object and +left+ tells if it is a left value or not. def to_c(level = 0, left = false)



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# File 'lib/HDLRuby/hruby_low2c.rb', line 3095

def to_c(res,level = 0, left = false)
    # puts "RefName to_c for #{self.name}"
    res << (" " * (level*3))
    res << "push("
    self.resolve.to_c_signal(res,level+1)
    res << "->" << (left ? "f_value" : "c_value")
    res << ");\n"
    return res
    # sig = self.resolve
    # if sig.each_signal.any? then
    #     # Save the value pool state.
    #     res << (" " * (level*3)) << "PV;\n"
    #     # There are sub signals, get and concat their values.
    #     subs = sig.each_signal.to_a
    #     subs.each do |sub|
    #         res << (" " * (level*3))
    #         res << "push("
    #         sub.to_c_signal(res,level+1)
    #         res << "->" << (left ? "f_value" : "c_value")
    #         res << ");\n"
    #     end
    #     # Compute the resulting concatenation.
    #     res << (" " * ((level+1)*3))
    #     res << "sconcat(#{subs.size},"
    #     res << (sig.type.direction == :little ? "1" : "0")
    #     res << ");\n"
    #     # Restore the value pool state.
    #     res << (" " * (level*3)) << "RV;\n"
    # else
    #     # There is no sub signals, get the signal value.
    #     res << (" " * (level*3))
    #     res << "push("
    #     sig.to_c_signal(res,level+1)
    #     res << "->" << (left ? "f_value" : "c_value")
    #     res << ");\n"
    # end
    # return res
end

#to_c_signal(res, level = 0) ⇒ Object

Generates the C text for reference as left value to a signal. +level+ is the hierarchical level of the object. def to_c_signal(level = 0)



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# File 'lib/HDLRuby/hruby_low2c.rb', line 3137

def to_c_signal(res,level = 0)
    # puts "to_c_signal with self=#{self.name}"
    self.resolve.to_c_signal(res,level+1)
    return res
end

#to_hdr(level = 0) ⇒ Object

Generates the text of the equivalent hdr text. +level+ is the hierachical level of the object.



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# File 'lib/HDLRuby/hruby_low2hdr.rb', line 730

def to_hdr(level = 0)
    # The resulting string.
    res = ""
    # Generates the sub reference if any.
    res << self.ref.to_hdr(level) << "." unless self.ref.is_a?(RefThis)
    # Generates the current reference.
    res << Low2HDR.hdr_use_name(self.name)
    # Returns the resulting string.
    return res
end

#to_high ⇒ Object

Creates a new high range reference.



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# File 'lib/HDLRuby/hruby_low2high.rb', line 535

def to_high
    return HDLRuby::High::RefName.new(self.type.to_high,
                                      self.ref.to_high,
                                      self.name)
end

#to_verilog ⇒ Object

Converts the system to Verilog code using +renamer+ for producing Verilog-compatible names.



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# File 'lib/HDLRuby/hruby_verilog.rb', line 1456

def to_verilog
    vname = name_to_verilog(self.name)
    # self.properties[:verilog_name] = vname
    return "#{vname}"
end

#to_vhdl(level = 0, std_logic = false) ⇒ Object

Generates the text of the equivalent HDLRuby::High code. +level+ is the hierachical level of the object. +std_logic+ tells if std_logic computation is to be done.



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# File 'lib/HDLRuby/hruby_low2vhd.rb', line 1541

def to_vhdl(level = 0, std_logic = false)
    # The resulting string.
    res = ""
    # Generate the sub refs if any (case of struct).
    unless self.ref.is_a?(RefThis) then
        res << self.ref.to_vhdl(level) << "."
    end
    # Generates the current reference.
    res << Low2VHDL.vhdl_name(self.name)
    res << "(0)" if std_logic # Force to std_logic if required
    # Returns the resulting string.
    return res
end

#use_name?(*names) ⇒ Boolean

Tell if the expression includes a signal whose name is one of +names+.

Returns:

  • (Boolean) 


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# File 'lib/HDLRuby/hruby_low.rb', line 6105

def use_name?(*names)
    # Is the named used here?
    return true if names.include?(@name)
    # No, recurse the reference.
    return @ref.use_name?(*names)
end