jextract/jni: handle UnsafeRawBufferPointer params#668
Merged
ktoso merged 4 commits intoswiftlang:mainfrom Apr 1, 2026
Merged
Conversation
ktoso
force-pushed
the
wip-unsafeRawBufferPointer-jni
branch
from
ac5ddbc to
3feba7f
Compare
This allows passing a Java byte array to an `UnsafeRawBufferPointer` accepting API in Swift. This conversion needs to copy a bunch but makes pretty much sense. This is in JNI mode specifically. In FFM mode we could do better by allocating and passing a MemorySegment but this is to unblock APIs in JNI mode specifically.
ktoso
force-pushed
the
wip-unsafeRawBufferPointer-jni
branch
from
3feba7f to
d24ffae
Compare
This allows passing a Java byte array to an `UnsafeRawBufferPointer` accepting API in Swift. This conversion needs to copy a bunch but makes pretty much sense. This is in JNI mode specifically. In FFM mode we could do better by allocating and passing a MemorySegment but this is to unblock APIs in JNI mode specifically.
ktoso
commented
Apr 1, 2026
Sources/JExtractSwiftLib/JNI/JNISwift2JavaGenerator+NativeTranslation.swift
Outdated
Show resolved
Hide resolved
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
1 participant
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
This allows passing a Java byte array to an
UnsafeRawBufferPointeraccepting API in Swift. This conversion needs to copy a bunch but makes pretty much sense. This is in JNI mode specifically.In FFM mode we could do better by allocating and passing a MemorySegment but this is to unblock APIs in JNI mode specifically.
We do allow returning an URBP to Java as well, but this is very dubious and scary, so we don't make anything sneaky here and literarily return this as anI actually ended up deciding that's a horrible idea, if anyone really needs it they can talk to us and we'll figure it out, otherwise I'm skipping this for now.SwiftUnsafeRawBufferPointerthat you may be able to do "something" with in java...