ultimate-pa/ultimate
Oct 2024 – Oct 2025
12 Months active
Languages Used
JavaPythonXMLBPLCC++ConfigurationEPF
Technical Skills
Code RefactoringCode TranslationComparison LogicCompiler DesignConfiguration ManagementData Serialization
Frank Schüssele
PROFILE
Frank Schüssele
Florian Schüßler developed and maintained core verification and analysis features for the ultimate-pa/ultimate repository, focusing on language parsing, static analysis, and build reliability. He enhanced C and ACSL support, improved memory and floating-point handling, and stabilized toolchain workflows through targeted refactoring and regression testing. Using Java and C, Florian implemented robust AST manipulation, code translation, and configuration management, addressing both correctness and performance. His work included optimizing build scripts, refining error handling, and expanding test coverage to ensure reliability. The depth of his contributions is reflected in the sustained improvements to translation accuracy, maintainability, and developer productivity across releases.
Overall Statistics
Feature vs Bugs
57%Features
Repository Contributions
321Total
Bugs
80
Commits
321
Features
105
Lines of code
251,140
Activity Months12
Your Network
16 peopleSame Organization
@informatik.uni-freiburg.de7
Work History
October 2025
5 Commits • 3 Features
Oct 1, 2025October 2025 performance summary for ultimate-pa/ultimate: delivered robust floating-point math enhancements, hardened memory handling, and improved testing/verification workflows. The work focused on increasing correctness, stability, and developer productivity with clear business value.
5 Commits • 3 Features
Oct 1, 2025October 2025 performance summary for ultimate-pa/ultimate: delivered robust floating-point math enhancements, hardened memory handling, and improved testing/verification workflows. The work focused on increasing correctness, stability, and developer productivity with clear business value.
October 2025
September 2025
4 Commits • 2 Features
Sep 1, 2025September 2025 monthly summary for ultimate-pa/ultimate focused on reliability, translation accuracy, and regression coverage. Delivered concrete improvements in test hygiene, variable declaration logic, and initialization regression testing, aligning technical work with business value of more reliable software and faster delivery.
September 2025
4 Commits • 2 Features
Sep 1, 2025September 2025 monthly summary for ultimate-pa/ultimate focused on reliability, translation accuracy, and regression coverage. Delivered concrete improvements in test hygiene, variable declaration logic, and initialization regression testing, aligning technical work with business value of more reliable software and faster delivery.
July 2025
4 Commits
Jul 1, 2025July 2025 monthly summary for ultimate-pa/ultimate focusing on reliability, performance, and developer experience. Delivered three targeted fixes/improvements that enhance runtime efficiency, cross-environment consistency, and readability: - Memory Handling Optimization and Bug Fix (Issue #731): removed an unnecessary loop in memmove/memcpy when heap pointers are not required, addressing the issue and boosting efficiency in hot memory paths. - IDE Formatter Configuration Cleanup and Update (Eclipse): removed non-functional formatter settings and updated configuration to align with Eclipse 2025, ensuring consistent code formatting across environments and backward compatible with 2024. - Pointer Dereference Validity Checks Description Formatting: improved UI/description readability for CC-related pointer dereference validity checks, enhancing developer understanding. Overall impact: improved runtime efficiency, more predictable formatting across developer environments, and clearer code-quality descriptions. These changes reduce maintenance burden and improve onboarding for new contributors. Technologies/skills demonstrated: low-level memory optimization in C, debugging and issue-driven fixes, Eclipse formatter configuration and version compatibility, UI/UX readability improvements, cross-environment consistency.
4 Commits
Jul 1, 2025July 2025 monthly summary for ultimate-pa/ultimate focusing on reliability, performance, and developer experience. Delivered three targeted fixes/improvements that enhance runtime efficiency, cross-environment consistency, and readability: - Memory Handling Optimization and Bug Fix (Issue #731): removed an unnecessary loop in memmove/memcpy when heap pointers are not required, addressing the issue and boosting efficiency in hot memory paths. - IDE Formatter Configuration Cleanup and Update (Eclipse): removed non-functional formatter settings and updated configuration to align with Eclipse 2025, ensuring consistent code formatting across environments and backward compatible with 2024. - Pointer Dereference Validity Checks Description Formatting: improved UI/description readability for CC-related pointer dereference validity checks, enhancing developer understanding. Overall impact: improved runtime efficiency, more predictable formatting across developer environments, and clearer code-quality descriptions. These changes reduce maintenance burden and improve onboarding for new contributors. Technologies/skills demonstrated: low-level memory optimization in C, debugging and issue-driven fixes, Eclipse formatter configuration and version compatibility, UI/UX readability improvements, cross-environment consistency.
July 2025
June 2025
3 Commits • 2 Features
Jun 1, 2025June 2025 monthly summary for ultimate-pa/ultimate focusing on reliability, performance, and build hygiene. Delivered a critical bug fix removing unsupported pointer-integer cast modes, added build-time dependency management for the web interface, and improved WebBackend startup performance by tuning the Equinox resolver. These changes reduce runtime edge cases, improve deployment reliability, and shorten startup times for users, reinforcing platform stability and developer efficiency. All work aligns with business goals of stronger reliability and faster time-to-value for customers.
June 2025
3 Commits • 2 Features
Jun 1, 2025June 2025 monthly summary for ultimate-pa/ultimate focusing on reliability, performance, and build hygiene. Delivered a critical bug fix removing unsupported pointer-integer cast modes, added build-time dependency management for the web interface, and improved WebBackend startup performance by tuning the Equinox resolver. These changes reduce runtime edge cases, improve deployment reliability, and shorten startup times for users, reinforcing platform stability and developer efficiency. All work aligns with business goals of stronger reliability and faster time-to-value for customers.
May 2025
14 Commits • 4 Features
May 1, 2025May 2025 performance highlights for ultimate-pa/ultimate: Delivered core language-analysis enhancements and stabilized the build. Key features include binary literals support in C parsing and analysis, variadic argument macro support (va_arg) in the GCC static language settings provider, and configurable ACSL assertion checks with robustness to prevent unnecessary toolchain cancellations. Addressed critical bugs in CACSL2BoogieTranslator for correct loop invariant computation when continue statements are present, and removed an unused struebli dependency to resolve build failures. Ongoing internal maintenance and refactoring improved interface consistency and maintainability, preparing the codebase for future enhancements. These changes improve parsing accuracy, reduce false positives, increase reliability of analysis, and streamline development.
14 Commits • 4 Features
May 1, 2025May 2025 performance highlights for ultimate-pa/ultimate: Delivered core language-analysis enhancements and stabilized the build. Key features include binary literals support in C parsing and analysis, variadic argument macro support (va_arg) in the GCC static language settings provider, and configurable ACSL assertion checks with robustness to prevent unnecessary toolchain cancellations. Addressed critical bugs in CACSL2BoogieTranslator for correct loop invariant computation when continue statements are present, and removed an unused struebli dependency to resolve build failures. Ongoing internal maintenance and refactoring improved interface consistency and maintainability, preparing the codebase for future enhancements. These changes improve parsing accuracy, reduce false positives, increase reliability of analysis, and streamline development.
May 2025
April 2025
25 Commits • 14 Features
Apr 1, 2025April 2025 (2025-04) monthly summary for repository ultimate-pa/ultimate focusing on delivering features, stabilizing the codebase, and expanding test coverage.
April 2025
25 Commits • 14 Features
Apr 1, 2025April 2025 (2025-04) monthly summary for repository ultimate-pa/ultimate focusing on delivering features, stabilizing the codebase, and expanding test coverage.
March 2025
35 Commits • 7 Features
Mar 1, 2025March 2025 highlights for ultimate-pa/ultimate focusing on code quality, API clarity, and maintainability. Delivered a foundational refactor, cleaned up build and dependencies, and fixed critical Sonar issues, resulting in more robust code and faster onboarding for new contributors.
35 Commits • 7 Features
Mar 1, 2025March 2025 highlights for ultimate-pa/ultimate focusing on code quality, API clarity, and maintainability. Delivered a foundational refactor, cleaned up build and dependencies, and fixed critical Sonar issues, resulting in more robust code and faster onboarding for new contributors.
March 2025
February 2025
18 Commits • 3 Features
Feb 1, 2025February 2025 focused on stabilizing the codebase, expanding ACSL support, and improving nightly-build reliability to reduce noise and improve long-term maintainability. Deliveries targeted business value through stronger static-analysis translation, more robust AST dispatch, and cleaner tooling for sustainable development.
February 2025
18 Commits • 3 Features
Feb 1, 2025February 2025 focused on stabilizing the codebase, expanding ACSL support, and improving nightly-build reliability to reduce noise and improve long-term maintainability. Deliveries targeted business value through stronger static-analysis translation, more robust AST dispatch, and cleaner tooling for sustainable development.
January 2025
45 Commits • 12 Features
Jan 1, 2025January 2025: Strengthened ACSL support, regression reliability, and internal refactors in ultimate-pa/ultimate. Delivered feature-rich ACSL handling with quantifiers and \\old/\\at support, aligned backtranslation and Kojak regression tests, and introduced dispatch and memory handling cleanups. Implemented switch-pattern matching for ACSLPrettyPrinter and MainDispatcher to simplify dispatch. Enhanced backtranslation behavior for \\at, updated error messaging, and improved test stability across witnesses and Referee. Completed maintenance work to improve code quality and future extensibility.
45 Commits • 12 Features
Jan 1, 2025January 2025: Strengthened ACSL support, regression reliability, and internal refactors in ultimate-pa/ultimate. Delivered feature-rich ACSL handling with quantifiers and \\old/\\at support, aligned backtranslation and Kojak regression tests, and introduced dispatch and memory handling cleanups. Implemented switch-pattern matching for ACSLPrettyPrinter and MainDispatcher to simplify dispatch. Enhanced backtranslation behavior for \\at, updated error messaging, and improved test stability across witnesses and Referee. Completed maintenance work to improve code quality and future extensibility.
January 2025
December 2024
18 Commits • 4 Features
Dec 1, 2024December 2024 (2024-12) monthly summary for ultimate-pa/ultimate. Focused on robustness, reliability, and performance to deliver business value in verification workflows and build startup efficiency. Key features delivered: - XML Formatter Fallback Support: added XML as a backup formatter path for EPF imports to increase resilience when the primary import fails. Commits: fd0345344badd361adc1b9791fad45636a5c81aa - Product Initialization Performance Optimization: speed startup by configuring equinox.resolver.revision.batch.size=1 across product files. Commit: 900a6e90386a4a890f4214840a288d51ea52e813 - Internal Refactors, Maintenance, and Witness Handling Cleanup: consolidate maintenance, refactor assertion order, inline witness validation, and clean up YAML witness data. Commits include 3ddba7f91dc0ed78ad03190f42a92324067690c7, e294632bcbe6dba94744e059f1e13b21fa3c00ae, 1cfc6d2dbc0f5873312683b337b3c77b98ddab4a, 48d48ebd254026f74c3cc339b6c5f5c73e47042a, 05d00bc2e98c1141b7fc1ac06e4eeab1b7bea38d, 4941ac7fd3195131b395e29103639e3735431393, 0988ca815c09cad145778078c049433dae9a1665 Major bugs fixed: - ACSL and Loop Invariant Robustness: improve verification robustness by ensuring loop invariants are boolean, tighten ACSL boolean conversion, and add regression tests. Commits: 99dbfa7eeb6140870edb0e8c5a137902a2b9ab33, 11ef26524766b5c985f2676f79ada31b98ee59ec, 1c4755c57abfb0423100d1eb7e75d686da30339d - Test Infrastructure and Regression Test Reliability: reorganize tests to exclude MathSAT where unsupported, fix regression test folder casing, and add regression test for boolean bitwise operations. Commits: 228894eee338451d5147625cfb38df359da6dee4, f251819c2e1c56337d318a713f87d7d1d4a92c32, f208d9114a26a8642f526a28f25560412a83e75d - MathSAT Rounding Mode Error Handling: classify unknown symbol roundNearestTiesToAway as known-ignored. Commit: 6f249bbaa926bc36e74907f0f3e5b6f71097daf7 Overall impact and accomplishments: - Increased verification reliability, reduced test fragility, and faster startup; improved resilience of EPF imports and witness handling; reduced maintenance overhead through targeted refactors. Technologies/skills demonstrated: - Formal verification tooling (ACSL), regression testing, test infrastructure improvements, performance tuning, YAML witness data handling, and robust error classification for external solvers.
December 2024
18 Commits • 4 Features
Dec 1, 2024December 2024 (2024-12) monthly summary for ultimate-pa/ultimate. Focused on robustness, reliability, and performance to deliver business value in verification workflows and build startup efficiency. Key features delivered: - XML Formatter Fallback Support: added XML as a backup formatter path for EPF imports to increase resilience when the primary import fails. Commits: fd0345344badd361adc1b9791fad45636a5c81aa - Product Initialization Performance Optimization: speed startup by configuring equinox.resolver.revision.batch.size=1 across product files. Commit: 900a6e90386a4a890f4214840a288d51ea52e813 - Internal Refactors, Maintenance, and Witness Handling Cleanup: consolidate maintenance, refactor assertion order, inline witness validation, and clean up YAML witness data. Commits include 3ddba7f91dc0ed78ad03190f42a92324067690c7, e294632bcbe6dba94744e059f1e13b21fa3c00ae, 1cfc6d2dbc0f5873312683b337b3c77b98ddab4a, 48d48ebd254026f74c3cc339b6c5f5c73e47042a, 05d00bc2e98c1141b7fc1ac06e4eeab1b7bea38d, 4941ac7fd3195131b395e29103639e3735431393, 0988ca815c09cad145778078c049433dae9a1665 Major bugs fixed: - ACSL and Loop Invariant Robustness: improve verification robustness by ensuring loop invariants are boolean, tighten ACSL boolean conversion, and add regression tests. Commits: 99dbfa7eeb6140870edb0e8c5a137902a2b9ab33, 11ef26524766b5c985f2676f79ada31b98ee59ec, 1c4755c57abfb0423100d1eb7e75d686da30339d - Test Infrastructure and Regression Test Reliability: reorganize tests to exclude MathSAT where unsupported, fix regression test folder casing, and add regression test for boolean bitwise operations. Commits: 228894eee338451d5147625cfb38df359da6dee4, f251819c2e1c56337d318a713f87d7d1d4a92c32, f208d9114a26a8642f526a28f25560412a83e75d - MathSAT Rounding Mode Error Handling: classify unknown symbol roundNearestTiesToAway as known-ignored. Commit: 6f249bbaa926bc36e74907f0f3e5b6f71097daf7 Overall impact and accomplishments: - Increased verification reliability, reduced test fragility, and faster startup; improved resilience of EPF imports and witness handling; reduced maintenance overhead through targeted refactors. Technologies/skills demonstrated: - Formal verification tooling (ACSL), regression testing, test infrastructure improvements, performance tuning, YAML witness data handling, and robust error classification for external solvers.
November 2024
144 Commits • 50 Features
Nov 1, 2024November 2024 (2024-11) – The Ultimate project delivered a set of performance, reliability, and SV-COMP readiness improvements, with broad adoption of IcfgBuilder across settings/toolchains, and targeted bug fixes stabilizing the core analysis flow. Business value came from faster evaluations, more predictable results, and cleaner build/test workflows through dependency migrations and toolchain harmonization. Key outcomes include speeding up evaluation by excluding hardness tasks, updating MathSAT to 5.6.11, and fixing critical correctness issues such as bitvector settings and NaN/infinity backtranslation errors. The month also advanced code hygiene and testing, aligning with SV-COMP requirements and improved error messaging.
144 Commits • 50 Features
Nov 1, 2024November 2024 (2024-11) – The Ultimate project delivered a set of performance, reliability, and SV-COMP readiness improvements, with broad adoption of IcfgBuilder across settings/toolchains, and targeted bug fixes stabilizing the core analysis flow. Business value came from faster evaluations, more predictable results, and cleaner build/test workflows through dependency migrations and toolchain harmonization. Key outcomes include speeding up evaluation by excluding hardness tasks, updating MathSAT to 5.6.11, and fixing critical correctness issues such as bitvector settings and NaN/infinity backtranslation errors. The month also advanced code hygiene and testing, aligning with SV-COMP requirements and improved error messaging.
November 2024
October 2024
6 Commits • 4 Features
Oct 1, 2024October 2024 performance summary for ultimate-pa/ultimate focused on delivering a robust benchmarking and stability feature set, enabling structured evaluation of bitvector solvers and improving development workflows. The work emphasized reproducible benchmarking, resilient configuration management, and precision in parameter handling to support scalable future work.
October 2024
6 Commits • 4 Features
Oct 1, 2024October 2024 performance summary for ultimate-pa/ultimate focused on delivering a robust benchmarking and stability feature set, enabling structured evaluation of bitvector solvers and improving development workflows. The work emphasized reproducible benchmarking, resilient configuration management, and precision in parameter handling to support scalable future work.
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Quality Metrics
Correctness88.2%
Maintainability90.0%
Architecture84.0%
Performance79.4%
AI Usage20.0%
Skills & Technologies
Programming Languages
ACSLBPLCC++ConfigurationCupEPFEclipse PreferencesEclipse SettingsGit
Technical Skills
ACSLAST ManipulationAST ParsingAST manipulationAbstract Class ImplementationAbstract InterpretationAbstract Syntax Tree (AST) ManipulationAbstract Syntax Tree ManipulationAlgorithm DesignAnnotation ProcessingAssertionAssertion HandlingAutomata TheoryAutomated TestingAutomated Theorem Proving
Repositories Contributed To
Overview of all repositories you've contributed to across your timeline