EDA Log File Warning Suppressor (ELFWS)

Suppresses warnings in EDA logfiles.

Table of Contents

• Overview
• Key Benefits
• Key Features
• Installation
• Usage
• Documentation
• Contributing

Overview

ELFWS was created after going through warning triage for an FPGA design. The synthesis tool provided the ability to suppress warnings, but only at the warning id level. The place and route tool did not supply any ability to suppress warnings. Eventually a design change induced a new warning. Unfortunately, it was not detected until much later in the design process. A design change was required to resolve the warning. The change was minor, but could have resulted in major design changes if it could not have been resolved.

Key Benefits

• Standardizes warning suppression definition
• Provides warning suppression for tools that do not support suppressions

Key Features

• Warning definition
  • Uses YAML to define suppression rules
  • Can include justifications for warning suppression
• Continuous Integration tool support
  • command line tool
  • outputs JUnit XML files
• Audit Reports
  • which rules suppressed which warnings
  • rules which did not suppress any warnings
  • warnings which were suppressed by multiple rules

Installation

You can get the latest released version of ELFWS via pip.

pip install elfws

The latest development version can be cloned...

git clone https://github.com/jeremiah-c-leary/eda-log-file-warning-supressor.git

...and then installed locally...

python setup.py install

Usage

ELFWS can be invoked using elfws at the command line prompt:

$ elfws
usage: elfws [-h] {create,report,show,suppress,version} ...

Suppresses Warnings in logfiles.

positional arguments:
  {create,report,show,suppress,version}
    create              Create suppression file
    report              Generate an audit report
    show                Show warnings in logfiles
    suppress            Suppresses warnings in logfiles
    version             Displays ELFWS version information

optional arguments:
  -h, --help            show this help message and exit

ELFWS has five subcommands: create, report, show, suppress and version.

create

Use the create subcommand to generate a suppression rule file from a given warning file.

This can be used as a starting point for a suppression file. Care should be taken as the output messages are not formatted to support regular expressions.

The arguments for the subcommand can be listed using the -h option:

$ elfws create -h
usage: elfws create [-h] [--suppression_file SUPPRESSION_FILE]
                    log_file output_suppression_file

positional arguments:
  log_file              Log file with warnings to extract
  output_suppression_file
                        Suppression file to create

optional arguments:
  -h, --help            show this help message and exit
  --suppression_file SUPPRESSION_FILE
                        Existing suppression file to filter out existing

report

Use the report subcommand to generate detailed output of suppression warnings.

The report will show the following information:

• Unsuppressed warnings
• Which suppression rules suppressed which warnings
• Unused suppression rules
• Warnings that were suppressed by multiple suppression rules
• Summary of suppression rules and warnings

The report can be used during reviews to ensure the suppressions are valid.

This command has the option argument --junit, which will output a JUnit XML file. This file can be used with continuous integration tools to check for new warnings.

The arguments for the subcommand can be listed using the -h option:

$ elfws report -h
usage: elfws report [-h] [--junit JUNIT] log_file suppression_file report_file

positional arguments:
  log_file          Log file to check for warnings
  suppression_file  YAML formatted warning suppression file
  report_file       Output report file

optional arguments:
  -h, --help        show this help message and exit
  --junit JUNIT     Generate JUnit XML file JUNIT

show

Use the show subcommand to list all the warnings in a logfile.

This can be useful when first starting out suppressing warnings and a suppression rule file does not exist.

The arguments for the subcommand can be listed using the -h option:

$ elfws show -h

usage: elfws show [-h] log_file

positional arguments:
  log_file    Log file to show warnings

optional arguments:
  -h, --help  show this help message and exit

suppress

Use the suppress subcommand to suppress warnings in a logfile.

This can be useful when creating a suppression rule file. It reports the results to the screen and only shows warnings which have not been suppressed.

This subcommand can also be used to support a continuous integration (CI) flow using the --junit option. The --junit option will create a JUnit XML file which can be read by CI tools.

The arguments for the subcommand can be listed using the -h option:

$ elfws suppress -h

usage: elfws suppress [-h] log_file suppression_file

positional arguments:
  log_file          Log file to check for warnings
  suppression_file  YAML formatted warning suppression file

optional arguments:
  -h, --help        show this help message and exit

version

Use the version subcommand to report the installed version of ELFWS.

There are no arguments for this subcommand.

$ elfws version

EDA Log File Warning Suppressor (ELFWS) version 1.0.0

Documentation

All documentation for ELFWS is hosted at read-the-docs.

Contributing

I welcome any contributions to this project. No matter how small or large.

There are several ways to contribute:

• Bug reports
• Code base improvements
• Feature requests

Please refer to the documentation hosted at read-the-docs for more details on contributing.