jasmin-lang/jasmin
Nov 2024 – Apr 2026
8 Months active
Languages Used
OCamlMLCoq
Technical Skills
ARM AssemblyCommand-line Interface DevelopmentCompiler DevelopmentLow-Level ProgrammingCommand Line InterfaceError Handling
Santiago Arranz Olmos
PROFILE
Santiago Arranz Olmos
Contributed to the jasmin-lang/jasmin repository by developing and refining core compiler features, focusing on reliability, maintainability, and formal correctness. Work included enhancing ARM assembly support, improving error and exception handling in command-line tools, and expanding LaTeX output robustness. Applied OCaml and Coq to implement formal verification for intermediate representations and optimize SLH lowering with proof engineering. Refactored loop counter logic and type-checking paths to strengthen code quality and type safety. Emphasized modular design and disciplined change management, delivering well-scoped commits that improved test coverage, reduced regression risk, and enabled safer future optimizations in compiler design and functional programming.
Overall Statistics
Feature vs Bugs
60%Features
Repository Contributions
11Total
Bugs
4
Commits
11
Features
6
Lines of code
2,501
Activity Months8
Work History
April 2026
1 Commits • 1 Features
Apr 1, 2026April 2026 (2026-04) monthly summary for jasmin repo: Implemented a comprehensive Compiler Loop Counter Handling Refactor by replacing the Loop module to centralize and improve loop-counter logic across the compiler. This refactor enhances structure, maintainability, and paves the way for future optimizations in code generation and loop handling. Associated commit: c8bdde6aa7ce7136b06058678b335de8cf001585 (message: 'replace Loop module').
1 Commits • 1 Features
Apr 1, 2026April 2026 (2026-04) monthly summary for jasmin repo: Implemented a comprehensive Compiler Loop Counter Handling Refactor by replacing the Loop module to centralize and improve loop-counter logic across the compiler. This refactor enhances structure, maintainability, and paves the way for future optimizations in code generation and loop handling. Associated commit: c8bdde6aa7ce7136b06058678b335de8cf001585 (message: 'replace Loop module').
April 2026
November 2025
2 Commits • 1 Features
Nov 1, 2025November 2025 monthly summary for jasmin-lang/jasmin focused on code quality improvements and type-safety hardening in core language features. Key deliverables include targeted refactoring to clarify critical paths and a precise bug fix to enforce correct size checks. Key items: - Code Quality Improvement: Refactor wequiv_fun_ind to remove spurious wequiv_f_rec assumptions, improving clarity and maintainability without changing core functionality. Commit: 653ab8950c034bd616a84adb7f9620b16867f415. - Bug Fix: Correct size_8_32 to check against U32, enhancing type safety and correctness. Commit: 77b1f35cee606b052bd5cfcc13714fc5b36df83e. Impact and accomplishments: - Reduced risk in core type-check paths and improved code maintainability, enabling safer future changes and easier onboarding for new team members. - Strengthened reliability of the compiler/runtime behavior through small, focused changes with clear intent and traceable commits. Technologies/skills demonstrated: - Refactoring and-code maintainability practices - Strong emphasis on type safety and correctness in size/type checks - Clear, well-scoped commits with descriptive messages to support review and rollback
November 2025
2 Commits • 1 Features
Nov 1, 2025November 2025 monthly summary for jasmin-lang/jasmin focused on code quality improvements and type-safety hardening in core language features. Key deliverables include targeted refactoring to clarify critical paths and a precise bug fix to enforce correct size checks. Key items: - Code Quality Improvement: Refactor wequiv_fun_ind to remove spurious wequiv_f_rec assumptions, improving clarity and maintainability without changing core functionality. Commit: 653ab8950c034bd616a84adb7f9620b16867f415. - Bug Fix: Correct size_8_32 to check against U32, enhancing type safety and correctness. Commit: 77b1f35cee606b052bd5cfcc13714fc5b36df83e. Impact and accomplishments: - Reduced risk in core type-check paths and improved code maintainability, enabling safer future changes and easier onboarding for new team members. - Strengthened reliability of the compiler/runtime behavior through small, focused changes with clear intent and traceable commits. Technologies/skills demonstrated: - Refactoring and-code maintainability practices - Strong emphasis on type safety and correctness in size/type checks - Clear, well-scoped commits with descriptive messages to support review and rollback
August 2025
1 Commits • 1 Features
Aug 1, 2025August 2025: Delivered ARM M4 instruction coverage enhancement for jasmin (jasmin-lang/jasmin) by expanding pattern matching to explicitly cover all supported ARM M4 instructions, and added previously unhandled instructions to the exhaustive check. This improvement strengthens compiler robustness and reduces the risk of unrecognised instruction handling on ARM targets, contributing to a more reliable embedded toolchain and easier future maintenance.
1 Commits • 1 Features
Aug 1, 2025August 2025: Delivered ARM M4 instruction coverage enhancement for jasmin (jasmin-lang/jasmin) by expanding pattern matching to explicitly cover all supported ARM M4 instructions, and added previously unhandled instructions to the exhaustive check. This improvement strengthens compiler robustness and reduces the risk of unrecognised instruction handling on ARM targets, contributing to a more reliable embedded toolchain and easier future maintenance.
August 2025
July 2025
1 Commits • 1 Features
Jul 1, 2025July 2025 monthly summary for jasmin: Delivered formal verification enhancements to the Intermediate Translation (IT) compiler pass. Implemented and integrated Coq-based proofs to strengthen correctness and robustness of the IT pass, including creation of new proof files and updates to existing proofs.
July 2025
1 Commits • 1 Features
Jul 1, 2025July 2025 monthly summary for jasmin: Delivered formal verification enhancements to the Intermediate Translation (IT) compiler pass. Implemented and integrated Coq-based proofs to strengthen correctness and robustness of the IT pass, including creation of new proof files and updates to existing proofs.
May 2025
1 Commits • 1 Features
May 1, 2025May 2025 monthly summary for jasmin repository. Focused on correctness-first improvements to the SLH lowering path by integrating ITree proofs and verification enhancements, alongside tightening compiler utilities for IR and SLH operation handling. This work improves reliability and maintainability of the intermediate representation and SLH transformations, enabling safer optimization passes and smoother future development.
1 Commits • 1 Features
May 1, 2025May 2025 monthly summary for jasmin repository. Focused on correctness-first improvements to the SLH lowering path by integrating ITree proofs and verification enhancements, alongside tightening compiler utilities for IR and SLH operation handling. This work improves reliability and maintainability of the intermediate representation and SLH transformations, enabling safer optimization passes and smoother future development.
May 2025
February 2025
1 Commits
Feb 1, 2025February 2025 (2025-02) — Jasmin project: Stabilized LaTeX output in jasmin2tex by implementing robust escaping of LaTeX special characters, addressing rendering issues and improving reliability of generated TeX.
February 2025
1 Commits
Feb 1, 2025February 2025 (2025-02) — Jasmin project: Stabilized LaTeX output in jasmin2tex by implementing robust escaping of LaTeX special characters, addressing rendering issues and improving reliability of generated TeX.
December 2024
2 Commits
Dec 1, 2024Monthly work summary for 2024-12 focused on stabilizing the jasmin toolchain through comprehensive error handling enhancements across the compilation tools. These changes reduce downstream failures, improve user messaging, and enable smoother automation in CI pipelines. Specifically, we implemented a unified error flow by catching exceptions in jasmin-ct and jasmin2ec and re-raising them as HiError, and we added granular exception handling in jasmin2tex to cover annotation, typing, and parsing errors. These improvements align with business goals of reliability, developer productivity, and better user experience.
2 Commits
Dec 1, 2024Monthly work summary for 2024-12 focused on stabilizing the jasmin toolchain through comprehensive error handling enhancements across the compilation tools. These changes reduce downstream failures, improve user messaging, and enable smoother automation in CI pipelines. Specifically, we implemented a unified error flow by catching exceptions in jasmin-ct and jasmin2ec and re-raising them as HiError, and we added granular exception handling in jasmin2tex to cover annotation, typing, and parsing errors. These improvements align with business goals of reliability, developer productivity, and better user experience.
December 2024
November 2024
2 Commits • 1 Features
Nov 1, 2024November 2024 focused on improving user control over warning output and correcting ARMv7 far global address loading in jasmin. Delivered a cross-tool --warn option across jasmin-ct, jasmin2tex, and jasmin2ec to adjust verbosity during compilation and conversion, enhancing UX and enabling tighter log management. Implemented an ARMv7 far-global load fix by splitting ADR into MOVW/MOVT to correctly load very large addresses, with an accompanying test case to validate the behavior. These changes improve build reliability, reduce noise for users, and strengthen the code generation accuracy on ARM targets.
November 2024
2 Commits • 1 Features
Nov 1, 2024November 2024 focused on improving user control over warning output and correcting ARMv7 far global address loading in jasmin. Delivered a cross-tool --warn option across jasmin-ct, jasmin2tex, and jasmin2ec to adjust verbosity during compilation and conversion, enhancing UX and enabling tighter log management. Implemented an ARMv7 far-global load fix by splitting ADR into MOVW/MOVT to correctly load very large addresses, with an accompanying test case to validate the behavior. These changes improve build reliability, reduce noise for users, and strengthen the code generation accuracy on ARM targets.
Activity
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Quality Metrics
Correctness92.8%
Maintainability89.0%
Architecture90.0%
Performance79.0%
AI Usage21.8%
Skills & Technologies
Programming Languages
CoqMLOCaml
Technical Skills
ARM AssemblyAssembly LanguageCommand Line InterfaceCommand-line Interface DevelopmentCompiler DevelopmentError HandlingException HandlingFormal VerificationLaTeXLow-Level ProgrammingOCamlProof EngineeringString Manipulationcompiler designformal verification
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