Class: HDLRuby::Low::SignalI

Inherits:
Object
  • Object
show all
Includes:
Hparent, Low2Symbol
Defined in:
lib/HDLRuby/hruby_low.rb,
lib/HDLRuby/hruby_low2c.rb,
lib/HDLRuby/hruby_low2hdr.rb,
lib/HDLRuby/hruby_low2sym.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_without_namespace.rb

Overview

Describes a signal.

Direct Known Subclasses

High::SignalI, SignalC

Constant Summary collapse

@@signal_id =

The id of a signal in the simulator.

0

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

#absolute_ref, #hierarchy, #no_parent!, #scope

Constructor Details

#initialize(name, type, val = nil) ⇒ SignalI

Creates a new signal named +name+ typed as +type+. If +val+ is provided, it will be the initial value of the signal.



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# File 'lib/HDLRuby/hruby_low.rb', line 2683

def initialize(name,type,val = nil)
    # Check and set the name.
    @name = name.to_sym
    # Check and set the type.
    if type.is_a?(Type) then
        @type = type
    else
        raise AnyError, "Invalid class for a type: #{type.class}."
    end
    # Check and set the initial value if any.
    if val then
        unless val.is_a?(Expression) then
            raise AnyError, "Invalid class for a constant: #{val.class}"
        end
        @value = val
        val.parent = self
    # For memory optimization: no  initialization if not used.
    # else
    #     @value = nil
    end
end

Instance Attribute Details

#name ⇒ Object (readonly)

The name of the signal



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# File 'lib/HDLRuby/hruby_low.rb', line 2672

def name
  @name
end

#type ⇒ Object (readonly)

The type of the signal



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# File 'lib/HDLRuby/hruby_low.rb', line 2675

def type
  @type
end

#value ⇒ Object (readonly)

The initial value of the signal if any.



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# File 'lib/HDLRuby/hruby_low.rb', line 2678

def value
  @value
end

Instance Method Details

#add_signal(sig) ⇒ Object

Adds sub signal +sig+



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# File 'lib/HDLRuby/hruby_low.rb', line 2712

def add_signal(sig)
    # puts "add sub=#{sig.name} in signal=#{self}"
    # Sets the hash of sub signals if none.
    @signals = HashName.new unless @signals
    # Check and add the signal.
    unless sig.is_a?(SignalI)
        raise AnyError,
              "Invalid class for a signal instance: #{sig.class}"
    end
    # if @signals.include?(sig) then
    #     raise AnyError, "SignalI #{sig.name} already present."
    # end
    # Set its parent.
    sig.parent = self
    # And add it
    @signals.add(sig)
end

#clone ⇒ Object

Clones (deeply)



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# File 'lib/HDLRuby/hruby_low.rb', line 2781

def clone
    return SignalI.new(self.name,self.type)
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 2751

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 value.
    self.value.each_deep(&ruby_block) if self.value
end

#each_signal(&ruby_block) ⇒ Object

Iterates over the sub signals.

Returns an enumerator if no ruby block is given.



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# File 'lib/HDLRuby/hruby_low.rb', line 2738

def each_signal(&ruby_block)
    # No ruby block? Return an enumerator.
    return to_enum(:each_signal) unless ruby_block
    # A ruby block? Apply it on each sub signal instance if any.
    @signals.each(&ruby_block) if @signals
end

#explicit_types! ⇒ Object

Explicit the types conversions in the signal.



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# File 'lib/HDLRuby/hruby_low_fix_types.rb', line 61

def explicit_types!
    # Is there a value?
    value = self.value
    if value then
        # Yes recurse on it.
        self.set_value!(value.explicit_types(self.type))
    end
    # No, nothing to do.
    return self
end

#get_by_name(name) ⇒ Object

Find an inner object by +name+. NOTE: return nil if not found.



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# File 'lib/HDLRuby/hruby_low_resolve.rb', line 117

def get_by_name(name)
    return self.get_signal(name)
end

#get_signal(name) ⇒ Object

Gets a sub signal by name.



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# File 'lib/HDLRuby/hruby_low.rb', line 2731

def get_signal(name)
    return @signals ? @signals[name] : nil
end

#immutable? ⇒ Boolean

Tells if the signal is immutable (cannot be written.)

Returns:

  • (Boolean) 


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# File 'lib/HDLRuby/hruby_low.rb', line 2706

def immutable?
    # By default, signals are not immutable.
    false
end

#replace_names!(former, nname) ⇒ Object

Replaces recursively +former+ name by +nname+ until it is redeclared.



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# File 'lib/HDLRuby/hruby_low_without_namespace.rb', line 420

def replace_names!(former,nname)
    # Recurse on the type.
    self.type.each_type_deep do |type|
        if type.respond_to?(:name) && type.name == former then
            type.set_name!(nname)
        end
    end
end

#set_name!(name) ⇒ Object

Sets the name.



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# File 'lib/HDLRuby/hruby_low_mutable.rb', line 470

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

#set_type!(type) ⇒ Object

Sets the type.



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# File 'lib/HDLRuby/hruby_low_mutable.rb', line 476

def set_type!(type)
    # Check and set the type.
    if type.is_a?(Type) then
        @type = type
    else
        raise AnyError, "Invalid class for a type: #{type.class}."
    end
end

#set_value!(value) ⇒ Object

Sets the value (can also be nil for removing the value).



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# File 'lib/HDLRuby/hruby_low_mutable.rb', line 486

def set_value!(value)
    # Check and set teh value.
    unless value == nil || value.is_a?(Expression) then
        raise AnyError, "Invalid class for a constant: #{value.class}"
    end
    @value = value
    value.parent = self unless value == nil
end

#to_c(res, level = 0) ⇒ Object

Generates the C text of the equivalent HDLRuby code. +level+ is the hierachical level of the object. def to_c(level = 0)



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# File 'lib/HDLRuby/hruby_low2c.rb', line 901

def to_c(res,level = 0)
    # First generate the sub signals if any.
    if self.each_signal.any? then
        self.each_signal do |signal|
            signal.to_c(res,level)
        end
        # return res
    end

    # No sub signals, generate for the current one.

    # puts "Signal.to_c with signal #{self.name} and c_name: #{Low2C.obj_name(self)}"
    # Declare the global variable holding the signal.
    res << "SignalI "
    self.to_c_signal(res,level+1)
    res << ";\n\n"

    # The header of the signal generation.
    res << " " * level*3
    res << "SignalI " << Low2C.make_name(self) << "() {\n"

    # res << " " * level*3
    # res << "Value l,r,d;\n"
    # res << " " * (level+1)*3
    # res << "unsigned long long i;\n"
    res << " " * (level+1)*3
    res << "SignalI signalI = malloc(sizeof(SignalIS));\n"
    res << " " * (level+1)*3
    res << "signalI->kind = SIGNALI;\n";
    res << "signalI->id = #{@@signal_id};\n"
    @@signal_id = @@signal_id+1;

    # Sets the global variable of the signal.
    res << "\n"
    res << " " * (level+1)*3
    self.to_c_signal(res,level+1)
    res << " = signalI;\n"

    # Set the owner if any.
    if self.parent then
        res << " " * (level+1)*3
        res << "signalI->owner = (Object)"
        res << Low2C.obj_name(self.parent) << ";\n"
    else
        res << "signalI->owner = NULL;\n"
    end

    # Set the name
    res << " " * (level+1)*3
    res << "signalI->name = \"#{self.name}\";\n"
    # Set the type.
    res << " " * (level+1)*3
    # res << "signalI->type = #{self.type.to_c(level+2)};\n"
    res << "signalI->type = "
    self.type.to_c(res,level+2)
    res << ";\n"

    # Generate and set the sub signals if any.
    res << " " * (level+1)*3
    num_sig = self.each_signal.to_a.size
    res << "signalI->num_signals = #{num_sig};\n"
    if num_sig > 0 then
        res << " " * (level+1)*3
        res << "signalI->signals = calloc(sizeof(SignalI),#{num_sig});\n"
        self.each_signal.with_index do |sig,i|
            res << " " * (level+1)*3
            res << "#{Low2C.obj_name(sig)} = #{Low2C.make_name(sig)}();\n"
            res << " " * (level+1)*3
            res << "signalI->signals[#{i}] = #{Low2C.obj_name(sig)};\n"
        end
    end

    # Set the current and the next value.
    res << " " * (level+1)*3
    res << "signalI->c_value = make_value(signalI->type,0);\n"
    res << " " * (level+1)*3
    res << "signalI->c_value->signal = signalI;\n"
    res << " " * (level+1)*3
    res << "signalI->f_value = make_value(signalI->type,0);\n"
    res << " " * (level+1)*3
    res << "signalI->f_value->signal = signalI;\n"
    if self.value then
        # There is an initial value.
        res << " " * (level+1)*3
        res << "copy_value("
        self.value.to_c_expr(res,level+2)
        res << ",signalI->c_value);\n"
        res << "copy_value("
        self.value.to_c_expr(res,level+2)
        res << ",signalI->f_value);\n"
    end

    # Initially the signal can be overwritten by anything.
    res << " " * (level+1)*3
    res << "signalI->fading = 1;\n"

    # Initialize the lists of behavior activated on this signal to 0.
    res << " " * (level+1)*3
    res << "signalI->num_any = 0;\n"
    res << " " * (level+1)*3
    res << "signalI->any = NULL;\n"
    res << " " * (level+1)*3
    res << "signalI->num_pos = 0;\n"
    res << " " * (level+1)*3
    res << "signalI->pos = NULL;\n"
    res << " " * (level+1)*3
    res << "signalI->num_neg = 0;\n"
    res << " " * (level+1)*3
    res << "signalI->neg = NULL;\n"

    # Register the signal for global processing.
    res << " " * (level+1)*3
    res << "register_signal(signalI);\n"


    # Generate the return of the signal.
    res << "\n"
    res << " " * (level+1)*3
    res << "return signalI;\n"

    # Close the signal.
    res << " " * level*3
    res << "};\n\n"
    return res
end

#to_c_alias(res, target, level = 0) ⇒ Object

Generates the C text of the equivalent HDLRuby code in case the signals is actually an alias to another signal. +other+ is the target signal of the alias. +level+ is the hierachical level of the object.



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# File 'lib/HDLRuby/hruby_low2c.rb', line 1057

def to_c_alias(res,target,level = 0)
    # puts "Signal.to_c_alias with name: #{Low2C.obj_name(self)}"
    # The resulting string.
    # res = ""

    # Declare the global variable holding the signal.
    res << "SignalI "
    self.to_c_signal(res,level+1)
    res << ";\n\n"

    # The header of the signal generation.
    res << " " * level*3
    res << "SignalI " << Low2C.make_name(self) << "() {\n"

    res << "SignalI signalI = #{Low2C.obj_name(target)};\n"

    # Sets the global variable of the signal.
    res << "\n"
    res << " " * (level+1)*3
    self.to_c_signal(res,level+1)
    res << " = signalI;\n"

    # Generate the return of the signal.
    res << "\n"
    res << " " * (level+1)*3
    res << "return signalI;\n"

    # Close the signal.
    res << " " * level*3
    res << "};\n\n"
    return res
end

#to_c_signal(res, level = 0) ⇒ Object

Generates the C text for an access to the signal. +level+ is the hierachical level of the object. def to_c_signal(level = 0)



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# File 'lib/HDLRuby/hruby_low2c.rb', line 886

def to_c_signal(res,level = 0)
    # res = Low2C.obj_name(self)
    res << Low2C.obj_name(self)
    # # Accumulate the names of each parent until there is no one left.
    # obj = self.parent
    # while(obj) do
    #     res << "_" << Low2C.obj_name(obj)
    #     obj = obj.parent
    # end
    return res
end

#to_ch(res) ⇒ Object

Generates the content of the h file. def to_ch



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# File 'lib/HDLRuby/hruby_low2c.rb', line 1029

def to_ch(res)
    # First generate the sub signals if any.
    if self.each_signal.any? then
        self.each_signal do |signal|
            signal.to_ch(res)
        end
        # return res
    end

    # No sub sub signal, generate for the current signal.
    # res = ""
    # puts "to_ch for SignalI: #{self.to_c_signal()}"
    # Declare the global variable holding the signal.
    # res << "extern SignalI #{self.to_c_signal()};\n\n"
    res << "extern SignalI "
    self.to_c_signal(res)
    res << ";\n\n"

    # Generate the access to the function making the behavior.
    res << "extern SignalI " << Low2C.make_name(self) << "();\n\n"

    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 309

def to_hdr(level = 0)
    return Low2HDR.hdr_use_name(self.name)
end

#to_high ⇒ Object

Creates a new high signal.



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# File 'lib/HDLRuby/hruby_low2high.rb', line 178

def to_high
    # Is there an initial value?
    if (self.value) then
        # Yes, create a new high signal with it.
        return HDLRuby::High::SignalI.new(self.name,self.type.to_high,
                                      self.val.to_high)
    else
        # No, create a new high signal with it.
        return HDLRuby::High::SignalI.new(self.name,self.type.to_high)
    end
end

#to_verilog ⇒ Object

Converts the system to Verilog code.



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# File 'lib/HDLRuby/hruby_verilog.rb', line 1911

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

#to_vhdl(level = 0) ⇒ Object

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

Raises:



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# File 'lib/HDLRuby/hruby_low2vhd.rb', line 874

def to_vhdl(level = 0)
    # Should never be here.
    raise AnyError, "Internal error: to_vhdl should be implemented in class :#{self.class}"
end

#width ⇒ Object

Gets the bit width.



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# File 'lib/HDLRuby/hruby_low.rb', line 2776

def width
    return @type.width
end