antmicro/verilator
Dec 2025 – Jan 2026
2 Months active
Languages Used
C++PythonSystemVerilogVerilog
Technical Skills
C++ developmentPython scriptingSystemVerilogTesting and validationVerilog designmemory management
Matthew Ballance
PROFILE
Matthew Ballance
Matt Ballance contributed to the antmicro/verilator repository by focusing on stability and memory safety improvements across C++, SystemVerilog, and Python codebases. He resolved cross-language faults at the DPI boundary by refining variable scope and lambda handling, and introduced regression tests to validate C++ and SystemVerilog interactions. Matt also addressed inheritance edge cases by adding runtime guards for super.new() calls without a base class, ensuring safer error handling. In January, he implemented scoped variable deletion in ConstVisitor to prevent use-after-free errors, enhancing simulation reliability. His work demonstrated careful debugging, test-driven development, and a strong emphasis on maintainable, robust code.
Overall Statistics
Feature vs Bugs
0%Features
Repository Contributions
3Total
Bugs
3
Commits
3
Features
0
Lines of code
249
Activity Months2
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Work History
January 2026
1 Commits
Jan 1, 2026January 2026 monthly summary for antmicro/verilator focused on memory-safety hardening in ConstVisitor to prevent use-after-free. Implemented a scoped variable deletion mechanism and updated invocation logic to ensure proper lifecycle management of variables under defined conditions. This work was committed as 8c977133c64075205e9cffb831d0831063478a2d (Fix use-after-free error #6846).
1 Commits
Jan 1, 2026January 2026 monthly summary for antmicro/verilator focused on memory-safety hardening in ConstVisitor to prevent use-after-free. Implemented a scoped variable deletion mechanism and updated invocation logic to ensure proper lifecycle management of variables under defined conditions. This work was committed as 8c977133c64075205e9cffb831d0831063478a2d (Fix use-after-free error #6846).
January 2026
December 2025
2 Commits
Dec 1, 2025Month: 2025-12 Key features delivered: - DPI Cross-Class Calling Stability Fix: resolved an internal fault in DPI cross-class calling by adjusting variable scope and lambda handling; added regression tests validating DPI interaction between C++ and SystemVerilog. - Guard against super.new() call without base class: added a guard to prevent runtime crashes when super.new() is invoked without a base class; included tests to verify correct error reporting. Major bugs fixed: - DPI cross-language boundary stability issues at the DPI boundary, reducing sporadic cross-language faults. - Inheritance edge-case crash when super.new() is called without a base class, now handled safely with clear error messaging. Overall impact and accomplishments: - Significantly improved reliability of DPI integrations and inheritance semantics in Verilator, reducing runtime crashes and increasing user trust. - Expanded regression test coverage for cross-language interactions and edge cases, enabling quicker detection of regressions. - Clearer commit messages and targeted tests, supporting maintainability and onboarding for contributors. Technologies/skills demonstrated: - C++, SystemVerilog, DPI, and cross-language debugging - Test-driven development and regression testing - Issue isolation, root-cause analysis, and safe code fixes - Git-based collaboration with precise commits (e.g., 3fc70b61d08b744b48e38ca7879024436fc8efd4; 0e03ab2a57f8f40d30a49117d0d452f62a6f1e57)
December 2025
2 Commits
Dec 1, 2025Month: 2025-12 Key features delivered: - DPI Cross-Class Calling Stability Fix: resolved an internal fault in DPI cross-class calling by adjusting variable scope and lambda handling; added regression tests validating DPI interaction between C++ and SystemVerilog. - Guard against super.new() call without base class: added a guard to prevent runtime crashes when super.new() is invoked without a base class; included tests to verify correct error reporting. Major bugs fixed: - DPI cross-language boundary stability issues at the DPI boundary, reducing sporadic cross-language faults. - Inheritance edge-case crash when super.new() is called without a base class, now handled safely with clear error messaging. Overall impact and accomplishments: - Significantly improved reliability of DPI integrations and inheritance semantics in Verilator, reducing runtime crashes and increasing user trust. - Expanded regression test coverage for cross-language interactions and edge cases, enabling quicker detection of regressions. - Clearer commit messages and targeted tests, supporting maintainability and onboarding for contributors. Technologies/skills demonstrated: - C++, SystemVerilog, DPI, and cross-language debugging - Test-driven development and regression testing - Issue isolation, root-cause analysis, and safe code fixes - Git-based collaboration with precise commits (e.g., 3fc70b61d08b744b48e38ca7879024436fc8efd4; 0e03ab2a57f8f40d30a49117d0d452f62a6f1e57)
Activity
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Quality Metrics
Correctness93.4%
Maintainability80.0%
Architecture80.0%
Performance80.0%
AI Usage20.0%
Skills & Technologies
Programming Languages
C++PythonSystemVerilogVerilog
Technical Skills
C++ developmentPython scriptingSystemVerilogTesting and validationVerilog designmemory managementsoftware testing
Repositories Contributed To
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