swiftlang/swift
Apr 2026 – Apr 2026
1 Month active
Languages Used
C++
Technical Skills
C++Memory ManagementUnit Testing
Fred Riss
PROFILE
Fred Riss
Worked on the swiftlang/swift repository to enhance the reliability of the Swift demangler by addressing a use-after-free issue in the Demangler’s Words[] buffer during nested demangle calls. Applied C++ memory management techniques and RAII patterns to update DemangleInitRAII, ensuring that Words[] and NumWords are properly saved and restored across nested contexts. This approach prevents inner demangling buffers from corrupting outer states, thereby reducing production crashes and improving the stability of metadata decoding and symbol resolution. Collaborated with cross-team contributors and utilized unit testing to validate the fix, demonstrating expertise in C++ and careful handling of temporary buffers.
Overall Statistics
Feature vs Bugs
0%Features
Repository Contributions
1Total
Bugs
1
Commits
1
Features
0
Lines of code
322
Activity Months1
Your Network
821 peopleSame Organization
@apple.com622
Shared Repositories
199
Work History
April 2026
1 Commits
Apr 1, 2026Monthly summary for 2026-04: Strengthened the Swift demangler’s memory safety in swiftlang/swift. Delivered a targeted fix for a use-after-free in Words[] across nested demangle calls by updating DemangleInitRAII to save and restore Words[] alongside NumWords. This prevents inner demangling buffers from leaking into outer contexts during symbol/type demangling, eliminating a class of crash-inducing scenarios in the MetadataReader path. The change is associated with commit e3ae0756a1c9ea47fd5c76c32115ef041048b482 (Co-Authored-By: Claude Opus 4.6). Impact: increases reliability of metadata decoding and symbol resolution in nested demangling, reduces production crashes, and stabilizes downstream tooling and diagnostics. Technologies/skills demonstrated: C++ memory management, RAII patterns, careful handling of temporary buffers, nested demangling internals, and cross-team collaboration.
1 Commits
Apr 1, 2026Monthly summary for 2026-04: Strengthened the Swift demangler’s memory safety in swiftlang/swift. Delivered a targeted fix for a use-after-free in Words[] across nested demangle calls by updating DemangleInitRAII to save and restore Words[] alongside NumWords. This prevents inner demangling buffers from leaking into outer contexts during symbol/type demangling, eliminating a class of crash-inducing scenarios in the MetadataReader path. The change is associated with commit e3ae0756a1c9ea47fd5c76c32115ef041048b482 (Co-Authored-By: Claude Opus 4.6). Impact: increases reliability of metadata decoding and symbol resolution in nested demangling, reduces production crashes, and stabilizes downstream tooling and diagnostics. Technologies/skills demonstrated: C++ memory management, RAII patterns, careful handling of temporary buffers, nested demangling internals, and cross-team collaboration.
April 2026
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Quality Metrics
Correctness100.0%
Maintainability80.0%
Architecture100.0%
Performance80.0%
AI Usage40.0%
Skills & Technologies
Programming Languages
C++
Technical Skills
C++Memory ManagementUnit Testing
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