Review Java 26 FFM bindings for ABI accuracy and arena lifetimes.
npx skills add https://github.com/bugabinga/pi-ext --skill java-ffm
Please help me install this Agent Skill. Skill: java-ffm Source: https://github.com/bugabinga/pi-ext/tree/main/skills/java-ffm Command: npx skills add https://github.com/bugabinga/pi-ext --skill java-ffm
It helps you write and review Java code that uses the Java 26 Foreign Function & Memory API (FFM) correctly and safely, so you avoid JVM crashes and subtle ABI/lifetime bugs when calling native C libraries or passing pointers and callbacks.
MemoryLayout/ValueLayout/FunctionDescriptor definitions to prevent wrong-size and out-of-bounds access.T**), and ensure upcall stubs and arenas have lifetimes compatible with native usage.Use the java-ffm skill while reviewing your Java FFM bindings and ask it to sanity-check your downcall descriptors, pointer handling, and arena lifetimes for the target native function.
High-intent search queries and answers about installing and using this skill.
To call native C functions from Java using the Foreign Function & Memory API, define ABI-accurate FunctionDescriptors and use arenas for downcalls, ensuring safe native memory access and correct lifetime management.
Modeling C structs and arrays in Java FFM requires explicit MemoryLayout and ValueLayout definitions, which prevents wrong-size and out-of-bounds access when exchanging native memory with Java.
Handling T* and T** pointer semantics in Java native memory access involves distinguishing returned pointers from pointer out-parameters, ensuring arenas and upcall stubs have compatible lifetimes with native usage.
Creating safe upcalls via function pointers in Java 26 requires ensuring upcall stubs and their associated arenas have lifetimes compatible with the target native usage to prevent JVM crashes.
Java FFM downcalls crash the JVM due to subtle ABI bugs, wrong-size memory access, or mismatched arena lifetimes, requiring reference-backed safety checks and exact function signatures to prevent.
Using jextract to generate Java bindings for C libraries helps verify C ABI and platform details, but you still need explicit FunctionDescriptors and careful arena ownership for safe native access.
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