HDL support for VS Code

HDL support for VS Code with Syntax Highlighting, Snippets, Linting, Formatting and much more!

Installation

Install it from VS Code Marketplace or Open VSX Registry.

Features

• Syntax Highlighting
  • Verilog-HDL
  • SystemVerilog
  • Bluespec SystemVerilog
  • VHDL
  • Vivado UCF constraints
  • Synopsys Design Constraints
  • Verilog Filelists (dot-F files)
  • Tcl
• Simple Snippets
• Linting support from:
  • Icarus Verilog - iverilog
  • Modelsim - modelsim
  • Verilator - verilator
  • Vivado Logical Simulation - xvlog
  • [Experimental] Slang - slang
• Linting support
  • Bluespec SystemVerilog
• Ctags Integration
  • Autocomplete
  • Document Symbols Outline
  • Hover over variable declaration
  • Go to Definition & Peek Definition
  • Module Instantiation
• [Experimental] Language Server support from:
  • svls
  • veridian
  • HDL Checker
  • verible-verilog-ls
  • rust_hdl
• [Experimental] Formatting support from:
  • verilog-format
  • istyle-verilog-formatter
  • verible-verilog-format

Usage Instructions

• All linters expect the executable binary ( iverilog , verilator ...) to be present in the PATH environment variable, unless otherwise specified.
• While using `include directives, the path to the files should be relative to the workspace directory, unlessrunAtFileLocation is enabled (not supported by all linters)

Ctags Integration

This extension uses the tags created using Ctags to provide many of its features. It is recommended to use Universal Ctags as it supports SystemVerilog also, compared to Exuberant Ctags and other older versions. The tags are stored in memory and not as separate files.

Currently the integrated feature supports only tags in the currently opened file, not tags in other files. However, you can use other independent Ctags extensions to find definitions from any file.

For example Ctags Companion works well with this extension by adding the following settings on .vscode/settings.json in your workspace.

{
    "ctags-companion.command": "ctags -R --fields=+nKz -f .vscode/.tags --langmap=SystemVerilog:+.v -R rtl /opt/uvm-1.2/src",
    "ctags-companion.readtagsEnabled": true,
}

It searches for definitions not only in the workspace, but also in files outside the workspace (ex. /opt/uvm-1.2/src in the example above). It also supports the readtags command included in Universal Ctags, allowing for fast searches from large workspaces.

Installation of Universal Ctags

• Windows - Daily builds are available at ctags-win32
• Linux - Installation instructions are here
• macOS - Install through Homebrew from here

Add the installation path of Ctags binary in your PATH environment variable or mention it in verilog.ctags.path setting.

Commands

• Rerun lint tool

  Choose a lint tool from the list and run it manually. Useful if the code was changed by an external script or version control system.

• Instantiate Module

  Choose a module present in your workspace to instantiate it in the current file.

Language Servers (Experimental)

We currently support the following Language Servers and enabled for Verilog-HDL, SystemVerilog and VHDL. You can enable multiple Language Servers at the same time. It might be pretty unstable because it's currently in the experimental support. If you encounter any problems even if it's not related to this feature, deleting all the config may solve the problem.

Language Server	Verilog-HDL	SystemVerilog	VHDL
svls	not supported	enabled	not supported
veridian	not supported	enabled	not supported
HDL Checker	enabled	enabled	enabled
verible-verilog-ls	enabled	enabled	not supported
rust_hdl	not supported	not supported	enabled

Formatting (Experimental)

We currently support Verilog-HDL file formatting with the following formatters.

• verilog-format
• thomasrussellmurphy/istyle-verilog-formatter.
• verible-verilog-format

You can format the Verilog-HDL file by typing Ctrl-Shift-p, then select Format Document. Entire file formatting is supported. Selected range formatting is not supported yet. All the settings for formatting is under verilog.formatting namespace.

Configuration Settings

Use the following settings to configure the extension to your needs.

• verilog.linting.linter (Default: none )

  Choose the linter for you. Possible values are

  • iverilog
  • modelsim
  • slang
  • verilator
  • xvlog
  • none

• verilog.linting.iverilog.arguments (Default: nothing)

  Add custom arguments to Icarus Verilog for linting, like -Wall . The argument -t null will be added by the linter automatically.

• verilog.linting.iverilog.includePath (Default: nothing)

  A list of directory paths to use while Icarus Verilog linting. All the paths are passed as arguments -I <directory_path>. Paths can be specified either an absolute or a relate to the workspace directory.

• verilog.linting.iverilog.runAtFileLocation (Default: false )

  By default, the linter will be run at the workspace directory. Enable this option to run at the file location. If enabled, ` include directives should contain file paths relative to the current file.

• verilog.linting.modelsim.arguments (Default: nothing)

  Add custom arguments to Modelsim for linting.

• verilog.linting.modelsim.work (Default: nothing)

  Add custom work library to Modelsim for linting.

• verilog.linting.slang.arguments (Default: nothing)

  Add Slang arguments here (like macros). They will be added to Slang while linting (The command "-I=" will be added by the linter by default).

• verilog.linting.slang.includePath (Default: nothing)

  A list of directory paths to use while Slang linting.

• verilog.linting.slang.runAtFileLocation (Default: false )

  If enabled, Slang will be run at the file location for linting. Else it will be run at workspace folder. Disabled by default.

• verilog.linting.slang.useWSL (Default: false )

  Run verilator under WSL. Paths generated automatically by the extension (the path to the Verilog file as well as the auto-generated document folder for -I ) are translated to WSL paths using the wslpath program. Any other paths you specify in verilog.linting.includePath.arguments

• verilog.linting.verilator.arguments (Default: nothing)

  Add custom arguments to Verilator for linting, like -Wall . The argument --lint-only -I<document folder> will be added by the linter automatically.

• verilog.linting.verilator.includePath (Default: nothing)

  A list of directory paths to use while Verilator linting. All the paths are passed as arguments -I<directory_path>. Paths can be specified either an absolute or a relate to the workspace directory.

• verilog.linting.verilator.runAtFileLocation (Default: false )

  By default, the linter will be run at the workspace directory. Enable this option to run at the file location. If enabled, ` include directives should contain file paths relative to the current file.

• verilog.linting.verilator.useWSL (Default: false )

  Run verilator under WSL (use apg-get install verilator to install). Paths generated automatically by the extension (the path to the Verilog file as well as the auto-generated document folder for -I ) are translated to WSL paths using the wslpath program. Any other paths you specify in verilog.linting.verilator.arguments

  must be manually converted.

• verilog.linting.xvlog.arguments (Default: nothing)

  Add custom arguments to Xilinx xvlog for linting, like -Wall . The argument --nolog will be added by the linter automatically.

• verilog.linting.xvlog.includePath (Default: nothing)

  A list of directory paths to use while Xilinx xvlog linting. All the paths are passed as arguments -i <directory_path>. Paths can be specified either an absolute or a relate to the workspace directory.

• verilog.ctags.path (Default: ctags )

  Path to your installation of Ctags if it isn't already present in your PATH environment variable.

• verilog.languageServer.svls.enabled (Default: false)

  [Experimental] Enable svls Language Server for SystemVerilog.

• verilog.languageServer.svls.path (Default: svls)

  [Experimental] A path to the svls Language Server binary.

• verilog.languageServer.veridian.enabled (Default: false)

  [Experimental] Enable veridian Language Server for SystemVerilog.

• verilog.languageServer.veridian.path (Default: veridian)

  [Experimental] A path to the veridian Language Server binary.

• verilog.languageServer.hdlChecker.enabled (Default: false)

  [Experimental] Enable HDL Checker Language Server for Verilog-HDL, SystemVerilog, and VHDL.

• verilog.languageServer.hdlChecker.path (Default: hdl_checker)

  [Experimental] A path to the HDL Checker Language Server binary.

• verilog.languageServer.veribleVerilogLs.enabled (Default: false)

  [Experimental] Enable verible-verilog-ls Language Server for SystemVerilog.

• verilog.languageServer.veribleVerilogLs.path (Default: verible-verilog-ls)

  [Experimental] A path to the verible-verilog-ls Language Server binary.

• verilog.languageServer.rustHdl.enabled (Default: false)

  [Experimental] Enable rust_hdl Language Server for VHDL.

• verilog.languageServer.rustHdl.path (Default: vhdl_ls)

  [Experimental] A path to the rust_hdl Language Server binary.

• verilog.formatting.verilogHDL.formatter (Default: verilog-format)

  [Experimental] Choose the Verilog-HDL formatter. Possible values are:

  • verilog-format
  • iStyle
  • verible-verilog-format

• verilog.formatting.systemVerilog.formatter (Default: verible-verilog-format)

  [Experimental] Choose the Verilog-HDL formatter. Possible values are:

  • verible-verilog-format

• verilog.formatting.verilogFormat.path (Default: verilog-format)

  [Experimental] A path to the verilog-format binary.

• verilog.formatting.verilogFormat.settings (Default: ${env:HOME}/.verilog-format.properties)

  [Experimental] A path to the verilog-format settings file.

• verilog.formatting.iStyleVerilogFormatter.path (Default: iStyle)

  [Experimental] A path to the iStyle Verilog Formatter binary.

• verilog.formatting.iStyleVerilogFormatter.arguments (Default: nothing)

  [Experimental] Add custom arguments to iStyle Verilog Formatter for formatting.

• verilog.formatting.iStyleVerilogFormatter.style (Default: Indent only)

  [Experimental] Choose styling options from ANSI/K&R/GNU.

• verilog.formatting.veribleVerilogFormatter.path (Default: verible-verilog-format)

  [Experimental] A path to the verible-verilog-format binary.

• verilog.formatting.veribleVerilogFormatter.arguments (Default: nothing)

  [Experimental] Add custom arguments to verible-verilog-format for formatting.

Compatibility

Feature	Windows	Linux	macOS
Basics (like Syntax highlighting)	Windows 10	Ubuntu 20.04	macOS 10.15
Icarus Verilog	Windows 10	Ubuntu 18.04	Yes
Vivado Logical Simulation	Windows 10	Not Tested	Not Tested
Modelsim	Windows 10	Ubuntu 18.04	Not Tested
Verilator	Windows 10	Debian 9	Not Tested
Ctags Integration	Windows 10	Ubuntu 18.10	Not Tested
Language Server	Windows 10	Ubuntu 20.04	macOS 10.15
Formatting	Not tested	Ubuntu 20.04	Not tested

If you have tested the linters in new platforms or have issues with them, feel free to file an issue.

Guidelines for Contributing

Logs

Logs are outputted to LogOutputChannel in th VS Code. You can check it by opening the Output pane in VS Code and choose Verilog in the drop-down menu.

Helpful links

• Verilog in VSCode With Linting (Using Modelsim) - YouTube

Thanks

• To all our Contributors
• Textmate Package for Verilog
• SublimeLinter-contrib-iverilog
• SublimeLinter-contrib-vlog
• Sublime Text Bluespec SystemVerilog
• yangsu/sublime-vhdl
• Sublime EDA
• dalance/svls
• vivekmalneedi/veridian
• suoto/hdl_checkerChecker
• chipsalliance/verible
• ericsonj/verilog-format
• thomasrussellmurphy/istyle-verilog-formatter
• slang C++ docs
• bitwisecook/vscode-tcl: Tcl for Visual Studio Code
  • configs/tcl.configuration.json and syntaxes/tcl.tmlanguage.json are obtained from the repo.
• eirikpre/VSCode-SystemVerilog: SystemVerilog support in VS Code
  • SystemVerilog syntax is obtained from the repo.