News

See pyVHDLModel Release Pages for detail release notes on every release.

Version 0.40.0 (2026)

v0.40.0 - 29.10.2026

New Features

• Mutation API, first part: generics, ports, parameters, declared items and statements can be added, inserted, moved and removed, with ownership checks and namespace updates; association items, context items, a document’s design units, a design’s documents and libraries too.

• VHDL writer: VHDLWriter writes the model as VHDL source text - from literals and expressions to design units, configurations and whole documents -, built on the visitor Visitor; formatting options are named after vhdl-style-guide’s.

• Warnings and mutation errors carry the model objects they are about.

• A design can be analyzed again after it was changed; design units are looked up by library and name, or searched in all libraries.

• Names, symbols, expressions, ranges, association items, object declarations and interface items can be copied.

• A subprogram’s signature - the type marks of its parameters and return value - tells overloads apart.

• Bit string literals compute their value.

Changes

• pyTooling 10.1 is required; Python 3.11 to 3.15 are supported.

• Duplicate declarations are critical warnings.

• A namespace keeps use-clause imports apart from its declarations.

• The base-classes of the model are abstract.

Bug Fixes

• Architecture keys, if-generate else branches, multi-identifier normalization, entity-instantiation errors, Context.ContextItems, a second Design.Analyze() and entity namespaces after the analysis.

Documentation

• New page VHDL Writer; the documentation is built with pyTooling.Sphinx.

Version 0.7.0 - 0.39.0 (2020 - 2026)

April 2026 - Generic, Port, and Parameter Groups

• Link components in architectures and components nested in concurrent statements.

• Added grouping of generics, ports and parameters.

Nov. 2025 - Raise Warnings

• Handle bit-string literals

• Raise Warnings instead of Exceptions.

Feb. 2025 - Blackboxes

• Support handling of blackboxes for component instantiations.

• Added dummy packages for Synopsys and Mentor Graphics “IEEE” packages.

Sept. 2024 - Unary Operators

• Added more unary operators.

• Added more doc-strings

Jan. 2023 - Dependency, Hierarchy, Compile Order Analysis

• Enhanced analysis of cross references.

• Enhanced dependency graphs:

  • Hierarchy graph and toplevel detection

  • Compile order computation

• Transformation from single module to >15 modules.

• Improved code coverage and test cases.

Dec. 2022 - Added Documentation Property

• GHDL’s is now able to collect and associate (documentation) comments to language constructs. This enhancement adds a Documentation property to many classes similar to a doc-string in Python.

• New -style of symbols merging a Name and a Symbol class.

• Finding relations between packages and its bodies, entities and its architectures.

• References to libraries, packages and contexts.

• Dependency graph for packages, contexts, and entities.

  • Package graph.

  • Hierarchy graph.

  • Compile order.

Jul. 2021 - First adoption and enhancements

• GHDL’s is the first big adopter with pyGHDL.dom to generate a network of instantiated classes derived from pyVHDLModel.
  It uses pyGHDL as a backend (GHDL build as shared object and loaded into CPython via C-binding API (ctypes).

Jun. 2021 - Model and documentation enhancements

• Made generic, port, and parameter items a subclass of the matching object classes.

• Added missing object representations for language features.

  • Finalized literals, expressions and types.

  • Added properties to empty placeholder classes.

• Corrected class hierarchy according to LRM.

• Enhanced class documentation and cross references.

• New documentation chapter for literals and expressions.

• Added inheritance diagrams as overviews to documentation sections.

• Added condensed code snippets outlining the main interface of a model’s object.

• New Single-File GitHub Action workflow (pipeline) including tests, documentation, packaging and publishing.

• Added Dependabot configuration file.

• Removed 2 dependencies to patched Sphinx extensions (now fixed in Sphinx).

• …

Jan. 2021 - Documentation enhancements

• Enhanced class documentation.

• Changed test runner to pytest.

• Dependency check and license clearance.
  See Dependency for details.

Dec. 2020 - Split from pyVHDLParser

• pyVHDLModel was split from pyVHDLParser (v0.6.0) as an independent Python package.