Skip to content

doc: fix Fast FFI argument count in ffi.md #63960

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
watilde wants to merge 1 commit into
base: main
Choose a base branch
from
+7 −2
Open

doc: fix Fast FFI argument count in ffi.md #63960

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
9 changes: 7 additions & 2 deletions doc/api/ffi.md
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -125,8 +125,13 @@ raw pointer `bigint` values. For pointer-like parameters, `null`, `undefined`,
strings, `Buffer`, typed array, `DataView`, and `ArrayBuffer` values are
converted on the JavaScript side before calling the optimized native wrapper.

Optimized Fast FFI calls support at most 8 function arguments. Functions with
more than 7 arguments use the generic FFI call path instead.
Optimized Fast FFI calls support at most 8 function arguments, but the exact
limit depends on the architecture and on the argument types, because each
argument must fit in the registers used by the platform trampoline. Integer
and pointer arguments are limited to 7 on AArch64 and to 6 on x86-64, while
floating-point arguments can use up to 8 on both. Functions that exceed these
limits, including any function with more than 8 arguments, use the generic FFI
call path instead.

## Signature objects

Expand Down
Loading