160 breaking releases
new 0.163.0 | Nov 6, 2024 |
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0.161.0 | Oct 25, 2024 |
0.151.0 | Jul 31, 2024 |
0.130.0 | Mar 28, 2024 |
0.14.0 | Nov 24, 2021 |
#2043 in Web programming
4,586 downloads per month
Used in 33 crates
(6 directly)
330KB
9K
SLoC
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-ffi ./tests/ffi/tests/bench.js
Dependencies
~94MB
~2M SLoC