esbmc/esbmc
Oct 2024 – Oct 2025
13 Months active
Languages Used
CMarkdownTextcmakeC++CUDAShellCMake
Technical Skills
C ProgrammingC programmingData AnalysisData UpdateDocumentationRegression Testing
Lucas C. Cordeiro
PROFILE
Lucas C. Cordeiro
Lucas Cordeiro led core development on the esbmc/esbmc repository, advancing formal verification tooling through deep enhancements to the Python frontend, C++ standard library models, and SMT backend integration. He engineered robust type inference, AST manipulation, and regression testing infrastructure, enabling reliable analysis of complex Python and C++ codebases. Using C++, Python, and advanced static analysis techniques, Lucas implemented features such as symbolic execution, improved type systems, and expanded test automation. His work addressed correctness, performance, and maintainability, delivering broad language support and safer verification workflows. The depth of his contributions reflects strong engineering rigor and comprehensive problem-solving across the stack.
Overall Statistics
Feature vs Bugs
77%Features
Repository Contributions
946Total
Bugs
110
Commits
946
Features
362
Lines of code
79,898
Activity Months13
Your Network
19 people
Work History
October 2025
135 Commits • 52 Features
Oct 1, 2025October 2025 (esbmc/esbmc) monthly summary focusing on reliability, feature delivery, and test/validation enhancements across the Python frontend and core analysis tooling. This month emphasized robust validation, performance improvements, and clearer documentation, with broad business impact through improved software quality and faster release cycles.
135 Commits • 52 Features
Oct 1, 2025October 2025 (esbmc/esbmc) monthly summary focusing on reliability, feature delivery, and test/validation enhancements across the Python frontend and core analysis tooling. This month emphasized robust validation, performance improvements, and clearer documentation, with broad business impact through improved software quality and faster release cycles.
October 2025
September 2025
204 Commits • 81 Features
Sep 1, 2025September 2025 (2025-09) performance and reliability highlights for esbmc/esbmc. Key features delivered: - Expanded Python type annotations: added support for f-strings, lambda expressions, try blocks, forward references, and string-based parameter annotations; introduced JSON safety checks to prevent crashes in subtype extraction and subscript annotation access. - Regex-based converter improvements: introduced regex support to the converter to enable pattern-based conversions and richer parsing rules. - Type inference improvements: added support for conditional expressions (ternary) and built-in type class methods, along with generic type inference for function parameters; improved handling for UnaryOp and width consistency. - SMT backend interface standardization: standardized the dump_smt() interface across solver backends to simplify backend integration and maintenance. - Documentation, tests, and quality: housekeeping across README/BUILDING.md; updated stats files; expanded Python test coverage with forward declaration tests, missing-return tests, and global-variable scenarios. Major bugs fixed: - Fixed crashes related to null/missing JSON keys in Python type annotation parsing and get_type_from_method. - Resolved IEEE floating-point crashes and precision issues in Python power operation. - Addressed missing throws for runtime_error paths and improved missing-return handling in tests. - Stabilized error handling and string parsing in Python converter paths. Overall impact and accomplishments: - Increased correctness, crash resilience, and safety of Python type analysis; reduced backend integration friction; improved test coverage and documentation; overall quality and maintainability of the esbmc/esbmc codebase. Technologies/skills demonstrated: - Python type system extension and static type analysis; C++ code style and clang frontend considerations; SMT backend integration; memory safety improvements; performance optimizations; test automation and documentation discipline.
September 2025
204 Commits • 81 Features
Sep 1, 2025September 2025 (2025-09) performance and reliability highlights for esbmc/esbmc. Key features delivered: - Expanded Python type annotations: added support for f-strings, lambda expressions, try blocks, forward references, and string-based parameter annotations; introduced JSON safety checks to prevent crashes in subtype extraction and subscript annotation access. - Regex-based converter improvements: introduced regex support to the converter to enable pattern-based conversions and richer parsing rules. - Type inference improvements: added support for conditional expressions (ternary) and built-in type class methods, along with generic type inference for function parameters; improved handling for UnaryOp and width consistency. - SMT backend interface standardization: standardized the dump_smt() interface across solver backends to simplify backend integration and maintenance. - Documentation, tests, and quality: housekeeping across README/BUILDING.md; updated stats files; expanded Python test coverage with forward declaration tests, missing-return tests, and global-variable scenarios. Major bugs fixed: - Fixed crashes related to null/missing JSON keys in Python type annotation parsing and get_type_from_method. - Resolved IEEE floating-point crashes and precision issues in Python power operation. - Addressed missing throws for runtime_error paths and improved missing-return handling in tests. - Stabilized error handling and string parsing in Python converter paths. Overall impact and accomplishments: - Increased correctness, crash resilience, and safety of Python type analysis; reduced backend integration friction; improved test coverage and documentation; overall quality and maintainability of the esbmc/esbmc codebase. Technologies/skills demonstrated: - Python type system extension and static type analysis; C++ code style and clang frontend considerations; SMT backend integration; memory safety improvements; performance optimizations; test automation and documentation discipline.
August 2025
138 Commits • 57 Features
Aug 1, 2025Month: 2025-08 — Concise summary of ESBMC/esbmc acceleration and stability improvements across architecture documentation, verification features, and backend tooling. The work delivered broad test coverage, documentation refresh, and performance-oriented optimizations, with a focus on business value: more reliable verification, faster feedback, and easier onboarding.
138 Commits • 57 Features
Aug 1, 2025Month: 2025-08 — Concise summary of ESBMC/esbmc acceleration and stability improvements across architecture documentation, verification features, and backend tooling. The work delivered broad test coverage, documentation refresh, and performance-oriented optimizations, with a focus on business value: more reliable verification, faster feedback, and easier onboarding.
August 2025
July 2025
61 Commits • 28 Features
Jul 1, 2025July 2025 focused on improving reliability and scalability of esbmc/esbmc for practical verification workloads. Highlights include stabilizing SMT encoding paths, expanding floating-point reasoning capabilities, broadening regression/testing coverage, and enhancing observability and documentation. These changes reduce crash risk, improve counterexample accuracy, and provide clearer reporting for multi-property verification, accelerating debugging and validation cycles for users.
July 2025
61 Commits • 28 Features
Jul 1, 2025July 2025 focused on improving reliability and scalability of esbmc/esbmc for practical verification workloads. Highlights include stabilizing SMT encoding paths, expanding floating-point reasoning capabilities, broadening regression/testing coverage, and enhancing observability and documentation. These changes reduce crash risk, improve counterexample accuracy, and provide clearer reporting for multi-property verification, accelerating debugging and validation cycles for users.
June 2025
71 Commits • 27 Features
Jun 1, 2025June 2025 monthly summary for esbmc/esbmc: Delivered substantive Python-analysis enhancements, stronger correctness guarantees, broader test coverage, and notable C++ STL/containers improvements. Key outcomes include advanced Python type inference and string handling, symbolic power support, built-in Python function handling, and for-loop transformations. NumPy paths now guard against 3D+ arrays to prevent unsupported usage. Regression tests expanded for overflow/NaN, range, class, and vector scenarios. Documentation and stats reporting were updated to reflect new capabilities and performance improvements, with notable performance gains in regression verification for insert2_fail and emplace_fail.
71 Commits • 27 Features
Jun 1, 2025June 2025 monthly summary for esbmc/esbmc: Delivered substantive Python-analysis enhancements, stronger correctness guarantees, broader test coverage, and notable C++ STL/containers improvements. Key outcomes include advanced Python type inference and string handling, symbolic power support, built-in Python function handling, and for-loop transformations. NumPy paths now guard against 3D+ arrays to prevent unsupported usage. Regression tests expanded for overflow/NaN, range, class, and vector scenarios. Documentation and stats reporting were updated to reflect new capabilities and performance improvements, with notable performance gains in regression verification for insert2_fail and emplace_fail.
June 2025
May 2025
106 Commits • 46 Features
May 1, 2025May 2025 highlights for esbmc/esbmc: Delivered substantial Python frontend enhancements, expanded numpy support, strengthened testing and reliability, and modernized documentation. Key business/value delivered includes expanded Python built-ins, robust type handling and division semantics, enhanced error reporting, broader regression coverage, and improved symbolics/concurrency testing. These changes improve safety-critical code analysis, reduce false positives, and accelerate debugging and validation for Python and numeric workloads.
May 2025
106 Commits • 46 Features
May 1, 2025May 2025 highlights for esbmc/esbmc: Delivered substantial Python frontend enhancements, expanded numpy support, strengthened testing and reliability, and modernized documentation. Key business/value delivered includes expanded Python built-ins, robust type handling and division semantics, enhanced error reporting, broader regression coverage, and improved symbolics/concurrency testing. These changes improve safety-critical code analysis, reduce false positives, and accelerate debugging and validation for Python and numeric workloads.
April 2025
18 Commits • 5 Features
Apr 1, 2025April 2025 (2025-04) monthly summary for esbmc/esbmc: Key features delivered, bugs fixed, and technical milestones that drive reliability and business value. Highlights include: benchmark stats updates, CI stability improvements, release readiness for v7.9, Python frontend type handling enhancements with regression tests, and internal code maintenance with goto-programs refactor.
18 Commits • 5 Features
Apr 1, 2025April 2025 (2025-04) monthly summary for esbmc/esbmc: Key features delivered, bugs fixed, and technical milestones that drive reliability and business value. Highlights include: benchmark stats updates, CI stability improvements, release readiness for v7.9, Python frontend type handling enhancements with regression tests, and internal code maintenance with goto-programs refactor.
April 2025
March 2025
68 Commits • 18 Features
Mar 1, 2025March 2025 (esbmc/esbmc): Strengthened verification capabilities through SMT backend enhancements, targeted bug fixes, and expanded regression and test coverage. Delivered business value by improving overflow analysis, incremental SMT performance, and path handling, while broadening language/front-end support and maintainability.
March 2025
68 Commits • 18 Features
Mar 1, 2025March 2025 (esbmc/esbmc): Strengthened verification capabilities through SMT backend enhancements, targeted bug fixes, and expanded regression and test coverage. Delivered business value by improving overflow analysis, incremental SMT performance, and path handling, while broadening language/front-end support and maintainability.
February 2025
62 Commits • 24 Features
Feb 1, 2025February 2025 – Esbmc/esbmc monthly summary 1) Key features delivered: - Expanded Python test suite for collection handling and data validation across lists, tuples, object properties, input handling, and print expressions. - Implemented Python tests for sorting and ordering of lists and tuples by object attributes and by element positions. - Added Python test coverage for randomness and strings, plus tests for assert statements and operator precedence; included min/max validations in tuples and casting/bitwise tests. - Object Model (OM) improvements: string model cleanup; regression tests for Python list operations; regression test coverage for STL list, multimap; fixes to list parsing and dereferencing with coding style improvements. - Backend and language capabilities: C++ locale operational model enabled; support and tests for Python random module; nondeterministic values handling; fixes for signed-unsigned comparisons. - Documentation and stats updates: updated README.md, CONTRIBUTIONS.md, and stats files (stats-30s.txt, stats-300s.txt) to reflect contributions and batch results. 2) Major bugs fixed: - SMT backend: fixed typos to improve error accuracy. - General typos across the codebase. - OM: fixed parsing error in list handling; dereference fixes and coding style improvements. - Regression: disabled flaky tests to stabilize the suite; fixes for unstable test cases. - Python: improved handling of nondeterministic values and return type of len; fixed signed-unsigned comparison; added and stabilized random module tests. 3) Overall impact and accomplishments: - Substantially increased automated test coverage and regression safety across Python, OM, and C++ areas, enabling faster feedback, reduced defect leakage, and safer code changes. - Improved reliability of parsing/evaluation paths, strengthened code quality through systematic typo fixes, and better documentation and metrics reporting. 4) Technologies/skills demonstrated: - Python testing and regression design, test automation and coverage analysis; Object Model (OM) improvements; C++ locale modeling and backend testing; debug, maintenance, and documentation practices.
62 Commits • 24 Features
Feb 1, 2025February 2025 – Esbmc/esbmc monthly summary 1) Key features delivered: - Expanded Python test suite for collection handling and data validation across lists, tuples, object properties, input handling, and print expressions. - Implemented Python tests for sorting and ordering of lists and tuples by object attributes and by element positions. - Added Python test coverage for randomness and strings, plus tests for assert statements and operator precedence; included min/max validations in tuples and casting/bitwise tests. - Object Model (OM) improvements: string model cleanup; regression tests for Python list operations; regression test coverage for STL list, multimap; fixes to list parsing and dereferencing with coding style improvements. - Backend and language capabilities: C++ locale operational model enabled; support and tests for Python random module; nondeterministic values handling; fixes for signed-unsigned comparisons. - Documentation and stats updates: updated README.md, CONTRIBUTIONS.md, and stats files (stats-30s.txt, stats-300s.txt) to reflect contributions and batch results. 2) Major bugs fixed: - SMT backend: fixed typos to improve error accuracy. - General typos across the codebase. - OM: fixed parsing error in list handling; dereference fixes and coding style improvements. - Regression: disabled flaky tests to stabilize the suite; fixes for unstable test cases. - Python: improved handling of nondeterministic values and return type of len; fixed signed-unsigned comparison; added and stabilized random module tests. 3) Overall impact and accomplishments: - Substantially increased automated test coverage and regression safety across Python, OM, and C++ areas, enabling faster feedback, reduced defect leakage, and safer code changes. - Improved reliability of parsing/evaluation paths, strengthened code quality through systematic typo fixes, and better documentation and metrics reporting. 4) Technologies/skills demonstrated: - Python testing and regression design, test automation and coverage analysis; Object Model (OM) improvements; C++ locale modeling and backend testing; debug, maintenance, and documentation practices.
February 2025
January 2025
20 Commits • 4 Features
Jan 1, 2025January 2025 monthly summary for esbmc/esbmc: Delivered key feature releases, test improvements, and library support enhancements that collectively raise product readiness, reliability, and cross-platform support. Major focus on ESBMC 7.8/7.8.x release, regression verification coverage, Python polymorphism testing, and isblank support in C standard library. These efforts translated into quicker release cycles, stronger verification guarantees, and clearer documentation, driving business value for customers relying on robust formal verification tooling.
January 2025
20 Commits • 4 Features
Jan 1, 2025January 2025 monthly summary for esbmc/esbmc: Delivered key feature releases, test improvements, and library support enhancements that collectively raise product readiness, reliability, and cross-platform support. Major focus on ESBMC 7.8/7.8.x release, regression verification coverage, Python polymorphism testing, and isblank support in C standard library. These efforts translated into quicker release cycles, stronger verification guarantees, and clearer documentation, driving business value for customers relying on robust formal verification tooling.
December 2024
23 Commits • 7 Features
Dec 1, 2024December 2024 monthly summary for esbmc/esbmc: Delivered targeted code cleanup, expanded regression test coverage, performance improvements, and updated documentation and metrics, along with an SMT solver upgrade. These changes reduce build dependencies, shorten verification cycles, improve regression reliability, and align with the latest solver features, delivering faster feedback and more robust verification across the project.
23 Commits • 7 Features
Dec 1, 2024December 2024 monthly summary for esbmc/esbmc: Delivered targeted code cleanup, expanded regression test coverage, performance improvements, and updated documentation and metrics, along with an SMT solver upgrade. These changes reduce build dependencies, shorten verification cycles, improve regression reliability, and align with the latest solver features, delivering faster feedback and more robust verification across the project.
December 2024
November 2024
32 Commits • 10 Features
Nov 1, 2024November 2024 monthly summary for esbmc/esbmc: Delivered incremental SMT improvements by converting asserts into assumes to enable incremental SMT workflows, enabling faster verification and better support for large-scale projects. Implemented concurrency improvements with simplified logical expressions and added thread guard logic to improve thread-safety in symbolic execution. Enhanced regression test suite: reduced verification time, marked THOROUGH tests, fixed verdicts, and added updated/new test cases from external issues; this led to more reliable results and faster feedback cycles. Updated documentation and test statistics to reflect the latest changes, including README updates and refreshed stats files (stats-30s, stats-300s, stats-600s). Performed SMT backend cleanup and runtime gating: require --smt-during-symex flag for incremental SMT checks and removed unused code in the SMT backend. All changes contributed to improved verification performance, reliability, and maintainability, aligning with goals for faster release cycles and higher confidence in verification outcomes.
November 2024
32 Commits • 10 Features
Nov 1, 2024November 2024 monthly summary for esbmc/esbmc: Delivered incremental SMT improvements by converting asserts into assumes to enable incremental SMT workflows, enabling faster verification and better support for large-scale projects. Implemented concurrency improvements with simplified logical expressions and added thread guard logic to improve thread-safety in symbolic execution. Enhanced regression test suite: reduced verification time, marked THOROUGH tests, fixed verdicts, and added updated/new test cases from external issues; this led to more reliable results and faster feedback cycles. Updated documentation and test statistics to reflect the latest changes, including README updates and refreshed stats files (stats-30s, stats-300s, stats-600s). Performed SMT backend cleanup and runtime gating: require --smt-during-symex flag for incremental SMT checks and removed unused code in the SMT backend. All changes contributed to improved verification performance, reliability, and maintainability, aligning with goals for faster release cycles and higher confidence in verification outcomes.
October 2024
8 Commits • 3 Features
Oct 1, 20242024-10: Delivered key feature upgrades, fixed regression test issues, and refreshed SVCOMP statistics, enhancing build stability, test reliability, and overall software quality for esbmc/esbmc.
8 Commits • 3 Features
Oct 1, 20242024-10: Delivered key feature upgrades, fixed regression test issues, and refreshed SVCOMP statistics, enhancing build stability, test reliability, and overall software quality for esbmc/esbmc.
October 2024
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Quality Metrics
Correctness88.6%
Maintainability87.8%
Architecture80.4%
Performance78.8%
AI Usage20.2%
Skills & Technologies
Programming Languages
BashCC++CMakeCUDAJSONLaTeXMakefileMarkdownNone
Technical Skills
AST ManipulationAST ParsingAbstract InterpretationAbstract Syntax Tree (AST) manipulationAbstract Syntax Trees (AST)Algorithm DesignAlgorithm DevelopmentAlgorithm ImplementationAlgorithm ImprovementAlgorithm OptimizationAlgorithm TestingAlgorithmsAssertion HandlingAtomic OperationsAttribute Propagation
Repositories Contributed To
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