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denoland-deno/ext/ffi
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Divy Srivastava 5928925541
fix(ext/ffi): disallow empty ffi structs (#17487) 
This patch makes `NativeType` to `libffi::middle::Type` conversion
failliable and w.t disallows struct with empty fields. libffi does not
handle "empty" struct because they don't exist in C (or Rust).

Fixes #17481
2023-01-21 21:21:14 +05:30
..
00_ffi.js chore: update dlint to v0.37.0 for GitHub Actions (#17295) 2023-01-16 17:17:18 +01:00
call.rs fix(ext/ffi): disallow empty ffi structs (#17487) 2023-01-21 21:21:14 +05:30
callback.rs fix(ext/ffi): disallow empty ffi structs (#17487) 2023-01-21 21:21:14 +05:30
Cargo.toml chore: forward v1.29.4 release commit to main (#17453) 2023-01-17 00:30:33 +01:00
dlfcn.rs fix(ext/ffi): disallow empty ffi structs (#17487) 2023-01-21 21:21:14 +05:30
ir.rs feat(ext/ffi): structs by value (#15060) 2023-01-08 09:28:10 +05:30
lib.rs feat(core): allow specifying name and dependencies of an Extension (#17301) 2023-01-08 23:48:46 +01:00
README.md fix(ext/ffi): trampoline for fast calls (#15139) 2022-07-12 06:33:05 +05:30
repr.rs chore: update copyright year to 2023 (#17247) 2023-01-02 21:00:42 +00:00
static.rs feat(ext/ffi): structs by value (#15060) 2023-01-08 09:28:10 +05:30
symbol.rs fix(ext/ffi): disallow empty ffi structs (#17487) 2023-01-21 21:21:14 +05:30
turbocall.rs chore: use rustfmt imports_granularity option (#17421) 2023-01-14 23:18:58 -05:00

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 ./test_ffi/tests/bench.js