Release v3.0 · MikePopoloski/slang

Highlights

As of this release slang passes 100% of the tests at https://github.com/chipsalliance/sv-tests (the only tool able to do so).

New option --obfuscate-ids when used with --preprocess will replace all identifiers in the output with obfuscated alphanumeric strings (thanks to @Sustrak)
Added a group of new warnings to report on unused code elements; see -Wunused
A new (currently experimental) tool, slang-tidy, has been added as a place to collect more in-depth or project-specific static analysis rules (thanks to @Sustrak).
New option --suppress-warnings allows suppressing warnings from one or more file paths, intended to allow easily hiding warnings from 3rd party code

The default library name for slang has been changed to "libsvlang" to avoid clashing with an existing "S-lang" package on most Linux systems. The library name is now configurable via CMake.
Errors about unknown package names are now ignored in lint-only mode
Drastically improved the performance of overlapping driver checking and driver loop unrolling. For large projects this may reduce compile times by as much as 80-90%.
Net charge strength and drive strength have been added to the AST
Added human-friendly names for function arguments in Python bindings (thanks to @Kuree)
Conditional statements in constant functions now implement unique/priority semantics (thanks to @HungMingWu)
Procedural force/release of bit selects or part selects is an error according to the LRM; this error can now be downgraded to a warning for compatibility with other tools (thanks to @udif)
Implicit named port connections with inequivalent types are disallowed by the LRM; this error can now be downgraded to a warning for compatibility with other tools
When printing type names in diagnostics, if more than one type shares the same simple name, they will now be disambiguated with their full path
A new --timescale option allows setting a default time scale for design elements. If this option is not set, there is no default and an error will be
issued if not all elements have a time scale specified (as required by the LRM).

Parameters used inside specify blocks will now issue an appropriate warning
Fixed an issue where the parser erroneously allowed selects of integer literal expressions
Top-level programs are now automatically instantiated, just like top-level modules
Implicit covergroups declared inside classes were previously not being checked for correctness
Fixed parser handling of spacing within always@( *) statements being misinterpreted as a closing attribute token (thanks to @godblesszhouzhou)
Fixed a bug in the lookup location used for non-ansi port symbol attribute expressions
Fixed -Werror to actually work
Tweaked handling of unbased unsized literals to reduce false-positive width warnings
Changed scoped access to incomplete forward typedefs to be allowed as long as the final name in the chain is not a type (matches behavior of other tools)
The parser now correctly disallows attributes on assignment operators
References to compilation unit items from within packages is now correctly disallowed
Hierarchical references from packages to items outside that package are now correctly disallowed
Bit-vector system functions (such as $countbits) can now be used with bitstream types (as opposed to just integral types)
Max size limits for packed and unpacked arrays and structs are now strictly enforced
Invalid inferred time scales will now issue an appropriate error
Fixed a bug in arithmetic of large constants at compile time (thanks to @adream307)