Provided by: libverilog-perl_3.418-1_amd64 
NAME
Verilog::SigParser - Signal Parsing for Verilog language files
SYNOPSIS
use Verilog::Preproc;
use Verilog::SigParser;
my $pp = Verilog::Preproc->new(keep_comments=>0,);
my $parser = new Verilog::SigParser;
$parser->parse_preproc_file ($pp);
# The below described callbacks are then invoked
DESCRIPTION
Verilog::SigParser builds upon the Verilog::Parser module to provide callbacks for when a
signal is declared, a module instantiated, or a module defined.
See the "Which Package" section of Verilog::Language if you are unsure which parsing
package to use for a new application. For a higher level interface to this package, see
Verilog::Netlist.
METHODS
The method interface to Verilog::SigParser is described in the Verilog::Parser module
which this package inherits. You will probably want to use the preprocessing option of
Verilog::Parser with this package.
CALLBACKS
In order to make the parser do anything interesting, you must make a subclass where you
override one or more of the following methods as appropriate.
Note Verilog::Parser callbacks also are invoked when SigParser is parsing.
$self->attribute ( $text )
Scanned an attribute or meta-comment. The parser inspects the first word of each
comment line ("//key rest" to end of line) or comment block ("/*key rest */). It
calls "$self-"attribute( meta_text )" if the first word has a true value in hash
"$self-"metacomment>.
$self->class ( $token, $name, $virtual )
This method is called at a class.
$self->covergroup ( $token, $name )
This method is called at a covergroup.
$self->contassign ( $token, $lhs, $rhs )
This method is called at a continuous "assign" keyword, with the left and right hand
part of the assignment. Note that "wire" initializations are not considered
assignments; those are received via the var callback's value parameter.
$self->defparam ( $token, $lhs, $rhs )
This method is called at a "defparam" keyword, with the left and right hand part of
the assignment.
$self->endcell ( $token )
This method is called at the end of defining a cell. It is useful for writing clean up
routines.
$self->endgroup ( $token )
This method is called at the end of defining a covergroup. It is useful for writing
clean up routines.
$self->endinterface ( $token )
This method is called at a endinterface keyword. It is useful for writing clean up
routines.
$self->endclass ( $token )
This method is called at a endclass keyword. It is useful for writing clean up
routines.
$self->endtaskfunc ( $token )
This method is called at a endfunction or endtask keyword. It is useful for writing
clean up routines.
$self->endmodport ( $token )
This method is called at a endmodport keyword. It is useful for writing clean up
routines.
$self->endmodule ( $token )
This method is called at a endmodule keyword. It is useful for writing clean up
routines.
$self->endpackage ( $token )
This method is called at a endpackage keyword. It is useful for writing clean up
routines.
$self->endprogram ( $token )
This method is called at a endprogram keyword. It is useful for writing clean up
routines.
$self->function ( $keyword, $name, $data-type )
This method is called when a function is defined. Type is the output size or
typename, plus "signed", for example "", "[3:0]", "integer", or "signed [2:0]".
$self->import ( $package, $id )
This method is called when an import is defined.
$self->instant ( $module, $cell, $range )
This method is called when a instantiation is defined. The first parameter is the
name of the module being instantiated. The second parameter is the name of the cell,
which may be "" for primitives. The third is the range if the cell was arrayed.
Prior to version 3.000, the name of the parameters were also included in this
callback. This has been replaced with the parampin callback.
$self->interface ( $keyword, $name )
This method is called when an interface is defined.
$self->modport ( $keyword, $name )
This method is called when an interface modport is defined.
$self->module ( $keyword, $name, ignored, $in_celldefine )
This method is called when a module is defined.
$self->package ( $keyword, $name )
This method is called when a package is defined.
$self->parampin ( $name, $connection, $index )
This method is called when a parameter is connected to an instantiation, IE the
"#(...)" syntax. It is also used for UDP delays (Three calls for
"#(delay0,delay1,delay2)"), as the parser does not know if the instantiation is for an
UDP versus a module.
$self->pin ( $name, $connection, $index )
This method is called when a pin on a instant is defined. If a pin name was not
provided and the connection is by position, name will be '' or undef.
If you do not need the pin nor var nor port callbacks, consider the "$self->new (...
use_vars=>0 ...)" option to accelerate parsing.
$self->port ( $name, $objof, $direction, $data_type, $array, $pinnum )
This method is called when a module port is defined. It may be called twice on a port
if the 1995 style is used; the first call is made at the port header, the second call
at the input/output declaration.
The first argument $name, is the name of the port. $objof is what the port is an
object of ('module', 'function', etc). $direction is the port direction ('input',
'output', 'inout', 'ref', 'const ref', or 'interface'). $data_type is the data type
('reg', 'user_type_t', 'signed [31:0]', etc, or for interfaces the
"{interface_id}.{modport_name}"). $array is the arraying of the port ('[1:0][2:0]',
'', etc). $pinnum is set to the pin number for ANSI style declarations, and 0 for
Verilog 1995 declarations made outside the port list.
If you do not need the pin nor var nor port callbacks, consider the "$self->new (...
use_vars=>0 ...)" option to accelerate parsing.
$self->ppdefine ( $defvar, $definition )
This method is called when a preprocessor definition is encountered.
$self->program ( $keyword, $name )
This method is called when a program is defined.
$self->signal_decl ( $keyword, $signame, $vector, $mem, $signed, $value )
This method is no longer used, see $self->var.
$self->task ( $keyword, $name )
This method is called when a task is defined.
$self->var ( $kwd, $name, $objof, $nettype, $data_type, $array, $value )
This method is called when a variable or net is defined.
The first argument $kwd is how it was declared ('port', 'var', 'genvar', 'parameter',
'localparam', 'typedef') or if applicable a net type ('supply0', 'wire', etc). $name
is the name of the variable. $objof is what the variable is an object of ('module',
'function', etc). $nettype is the net type if any was defined ('', 'supply0', 'wire',
'tri', etc). $data_type is the data type ('user_type_t', '[31:0] signed', etc).
$array is the arraying of the variable which is the text AFTER the variable name
('[1:0][2:0]', '', etc). $value is what the variable was assigned to ('', or
expression).
Note typedefs are included here, because "parameter type" is both a variable and a
type declaration.
If you do not need the pin nor var nor port callbacks, consider the "$self->new (...
use_vars=>0 ...)" option to accelerate parsing.
Below are some example declarations and the callbacks:
reg [4:0] vect = 5'b10100;
# VAR 'var' 'vect' 'module' '' 'reg [4:0]' '' '5'b10100'
wire (weak0, weak1) value = pullval;
# VAR 'net' 'value' 'module' 'wire' '' '' 'pullval'
reg [1:0] mem [12:2];
# VAR 'var' 'mem' 'module' '' 'reg [1:0]' '[12:2]' ''
int n[1:2][1:3] = '{'{0,1,2}, '{3{4}}};
# verilog/parser_sv.v:121: VAR 'var' 'n' 'module' '' 'int' '[1:2][1:3]' ''{'{0,1,2},'{3}}'
module ( output logic [SZ-1:0] o_sized );
# VAR 'port' 'o_sized' 'module' '' 'logic [SZ-1:0]' '' ''
struct packed signed { bit [7:0] m_b; };
# VAR 'member' 'm_b' 'struct' '' 'bit [7:0]' '' ''
BUGS
This is being distributed as a baseline for future contributions. Don't expect a lot, the
Parser is still naive, and there are many awkward cases that aren't covered.
Note the SigParser is focused on extracting signal information. It does NOT extract
enough information to derive general interconnect; for example the contents of 'assign'
statements are not parsed.
DISTRIBUTION
Verilog-Perl is part of the <http://www.veripool.org/> free Verilog EDA software tool
suite. The latest version is available from CPAN and from
<http://www.veripool.org/verilog-perl>.
Copyright 2000-2016 by Wilson Snyder. This package is free software; you can redistribute
it and/or modify it under the terms of either the GNU Lesser General Public License
Version 3 or the Perl Artistic License Version 2.0.
AUTHORS
Wilson Snyder <wsnyder@wsnyder.org>
SEE ALSO
Verilog-Perl, Verilog::Parser, Verilog::Language, Verilog::Netlist, Verilog::Getopt