---
name: "vhier"
section: "1p"
platform: "linux"
package: "libverilog-perl"
version: "3.482-2"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/vhier"
---

# vhier(1p)

Return all files in a verilog hierarchy using Verilog::Netlist

## NAME

vhier - Return all files in a verilog hierarchy using Verilog::Netlist

## SYNOPSIS

```
  vhier --help
  vhier [verilog_options] [-o filename] [verilog_files.v...]
```

## DESCRIPTION

Vhier reads the Verilog files passed on the command line and outputs a tree of all of the filenames, modules, and cells referenced by that file.

## VERILOG ARGUMENTS

The following arguments are compatible with GCC, VCS and most Verilog programs.

- \+define+*var*+*value* =item -D*var*=*value*

  Defines the given preprocessor symbol.

- \-F *file*

  Read the specified file, and act as if all text inside it was specified as command line parameters.  Any relative paths are relative to the directory containing the specified file.

- \-f *file*

  Read the specified file, and act as if all text inside it was specified as command line parameters.  Any relative paths are relative to the current directory.

- \+incdir+*dir* =item -I*dir*

  Add the directory to the list of directories that should be searched for include directories or libraries.

- \+libext+*ext*+*ext*...

  Specify the extensions that should be used for finding modules.  If for example module *x* is referenced, look in *x*.*ext*.

- \-sv

  Specifies SystemVerilog language features should be enabled; equivalent to "--language 1800-2023".  This option is selected by default, it exists for compatibility with other simulators.

- \-y *dir*

  Add the directory to the list of directories that should be searched for include directories or libraries.

## VHIER ARGUMENTS

- \--help

  Displays this message and program version and exits.

- \--o *file*

  Use the given filename for output instead of stdout.

- \--cells

  Show the module name of all cells in top-down order.

- \--forest

  Show "ASCII-art" hierarchy tree of all cells (like ps --forest)

- \--input-files

  Show all input filenames.  Copying all of these files should result in only those files needed to represent the entire design.

- \--includes

  Show each source filename that includes another filename.  The included filename will be as specified in the original source filename, so it may be necessary to resolve it into an absolute path for further processing.

- \--instance

  With --cells or --forest, show module instance names.

- \--language \<1364-1995\|1364-2001\|1364-2005\|1800-2005\|1800-2009\|1800-2012\|1800-2017\|1800-2023\>

  Set the language standard for the files.  This determines which tokens are signals versus keywords, such as the ever-common "do" (data-out signal, versus a do-while loop keyword).

- \--resolve-files

  Show resolved filenames passed on the command line.  This will convert raw module and filenames without paths to include the library search path directory.  Output filenames will be in the same order as passed on the command line.  Unlike --input-files or --module-files, hierarchy is not traversed.

- \--module-files

  Show all module filenames in top-down order.  Child modules will always appear as low as possible, so that reversing the list will allow bottom-up processing of modules.  Unlike input-files, header files are not included.

- \--modules

  Show all module names.

- \--no-missing

  Do not complain about references to missing modules.

- \--missing-modules

  With --nomissing, show all modules that are not found.

- \--skiplist *file*

  Given file contains a list of regular expressions, one per line. If a module name in the design hierarchy matches one of these expressions, skip showing that module and any sub-hierarchy.

- \--synthesis

  Define SYNTHESIS, and ignore text between "ambit", "pragma", "synopsys" or "synthesis" translate\_off and translate\_on meta comments.  Note using metacomments is discouraged as they have led to silicon bugs (versus ifdef SYNTHESIS); see \<https://www.veripool.org/papers/TenIPEdits\_SNUGBos07\_paper.pdf\>.

- \--top-module *module*

  Start the report at the specified module name, ignoring all modules that are not the one specified with --top-module or below, and report an error if the --top-module specified does not exist.  Without this option vhier will report all modules, starting at the module(s) that have no children below them.

  Note this option will not change the result of the --input-files list, as the files needed to parse any design are independent of which modules are used.

- \--version

  Displays program version and exits.

- \--xml

  Create output in XML format.

## DISTRIBUTION

Verilog-Perl is part of the \<https://www.veripool.org/\> free Verilog EDA software tool suite.  The latest version is available from CPAN and from \<https://www.veripool.org/verilog-perl\>.

Copyright 2005-2024 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::Getopt, Verilog::Preproc, Verilog::Netlist