Enforce GC-safe C++ coding rules for Hermes VM runtime.
npx skills add https://github.com/facebook/hermes --skill gc-safe-coding
Please help me install this Agent Skill. Skill: gc-safe-coding Source: https://github.com/facebook/hermes/tree/main/.claude/skills/gc-safe-coding Command: npx skills add https://github.com/facebook/hermes --skill gc-safe-coding
This Skill provides essential guidelines for writing and reviewing C++ code within the Hermes VM runtime, specifically focusing on memory safety and preventing crashes related to garbage collection.
Locals and PinnedValue for new code, discouraging older methods like GCScope and makeHandle().CallResult for exceptions before using the returned values.Follow the checklist provided in the skill's documentation to ensure your C++ code is GC-safe.
High-intent search queries and answers about installing and using this skill.
To write GC-safe C++ code in the Hermes VM runtime, you must use modern rooting techniques like Locals and PinnedValue, and ensure raw pointers are properly rooted before operations that might trigger garbage collection.
Rooting raw pointers to GC objects before a safepoint is required to prevent memory corruption and crashes, because garbage collection can move or reclaim unrooted objects during runtime operations.
For new Hermes VM C++ code, you should use Locals and PinnedValue rooting patterns, while avoiding older methods like GCScope and makeHandle() to ensure proper memory safety.
To handle CallResult exceptions in Hermes VM APIs, you must explicitly check the CallResult for exceptions before using the returned values to prevent runtime instability and ensure robust error handling.
You should avoid GCScope and makeHandle() when developing new features or fixing bugs in the core Hermes VM logic, as modern rooting techniques like Locals and PinnedValue are mandated for memory safety.
Yes, Hermes VM C++ code review requires enforcing strict rules for GC-managed types, handles, and safepoints, ensuring developers adhere to specific rooting patterns to prevent memory corruption.
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