Uses new Rust 2021
|new 0.58.0||Sep 28, 2022|
|0.56.0||Sep 15, 2022|
|0.50.0||Jul 28, 2022|
|0.32.0||Mar 31, 2022|
|0.14.0||Nov 24, 2021|
#302 in Web programming
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Used in 10 crates (2 directly)
This crate implements dynamic library ffi.
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,
tinycc. Currently, the optimized path is only supported on Linux and
To run benchmarks:
target/release/deno bench --allow-ffi --allow-read --unstable ./test_ffi/tests/bench.js