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deno/ext/ffi
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Aapo Alasuutari 17271532d4
fix(ext/ffi): Invalid 'function' return type check logic, remove U32x2 as unnecessary (#16259) 
The return type checking for `"function"` type FFI values was incorrect
and presumed that functions were still being registered as objects
containing a "function" key.

While here, I also removed the whole return type checking logic as it
was needed for optionally creating BigInts on return when needed, but
serde_v8 does this automatically now (I think).
2022-10-13 17:36:52 +05:30
..
00_ffi.js fix(ext/ffi): Invalid 'function' return type check logic, remove U32x2 as unnecessary (#16259) 2022-10-13 17:36:52 +05:30
Cargo.toml chore: forward v1.26.1 release commit to main (#16178) 2022-10-06 16:49:40 -04:00
fast_call.rs feat(ext/ffi): Implement FFI fast-call trampoline with Dynasmrt (#15305) 2022-09-07 12:23:56 +05:30
lib.rs fix(ext/ffi): Invalid 'function' return type check logic, remove U32x2 as unnecessary (#16259) 2022-10-13 17:36:52 +05:30
README.md fix(ext/ffi): trampoline for fast calls (#15139) 2022-07-12 06:33:05 +05:30

README.md

deno_ffi

This crate implements dynamic library ffi.

Performance

Deno FFI calls have extremely low overhead (~1ns on M1 16GB RAM) and perform on par with native code. Deno leverages V8 fast api calls and JIT compiled bindings to achieve these high speeds.

Deno.dlopen generates an optimized and a fallback path. Optimized paths are triggered when V8 decides to optimize the function, hence call through the Fast API. Fallback paths handle types like function callbacks and implement proper error handling for unexpected types, that is not supported in Fast calls.

Optimized calls enter a JIT compiled function "trampoline" that translates Fast API values directly for symbol calls. JIT compilation itself is super fast, thanks to tinycc. Currently, the optimized path is only supported on Linux and MacOS.

To run benchmarks:

target/release/deno bench --allow-ffi --allow-read --unstable ./test_ffi/tests/bench.js