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denoland-deno/ext/ffi
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林炳权 9304126be5
chore: update to Rust 1.77.2 (#23262) 
update to Rust 1.77.2


---------

Co-authored-by: Matt Mastracci <matthew@mastracci.com>
2024-04-10 22:08:23 +00:00
..
00_ffi.js refactor: Use virtul ops module (#22175) 2024-01-29 22:02:26 +01:00
call.rs chore: update copyright to 2024 (#21753) 2024-01-01 19:58:21 +00:00
callback.rs chore: update to Rust 1.77.2 (#23262) 2024-04-10 22:08:23 +00:00
Cargo.toml chore: forward v1.42.1 release commit to main (#23162) 2024-04-01 13:35:46 +05:30
dlfcn.rs chore: update to Rust 1.77.2 (#23262) 2024-04-10 22:08:23 +00:00
ir.rs refactor(ext/ffi): don't go through serde_v8::Value (#23034) 2024-03-22 19:05:06 +00:00
lib.rs chore: update copyright to 2024 (#21753) 2024-01-01 19:58:21 +00:00
README.md chore: move test_ffi and test_nap to tests/ [WIP] (#22394) 2024-02-12 13:46:50 -07:00
repr.rs chore: upgrade deno_core to 0.244.0 (#21859) 2024-01-09 17:25:10 +01:00
static.rs chore: update copyright to 2024 (#21753) 2024-01-01 19:58:21 +00:00
symbol.rs chore: update copyright to 2024 (#21753) 2024-01-01 19:58:21 +00:00
turbocall.rs chore(ext/ffi): sym is unused on aarch64 linux (#23188) 2024-04-02 20:57:31 +00:00

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-ffi ./tests/ffi/tests/bench.js