Question 1

How do I set up Sulong to run my C code in GraalVM?

Accepted Answer

Compile your C code to LLVM bitcode using Clang with the -emit-llvm flag, then use GraalVM's polyglot API to execute it. Detailed instructions are in the Graal repository's documentation.

Question 2

Sulong or traditional FFI: which is better for C/Java integration?

Accepted Answer

Sulong offers more seamless integration within a single VM, allowing direct calls and shared memory. Traditional FFI like JNI requires more boilerplate and has higher marshalling costs, but might be more stable for pure Java environments.

Question 3

Can Sulong run Rust programs on GraalVM?

Accepted Answer

Yes, if Rust code is compiled to LLVM bitcode, Sulong can execute it, enabling Rust to interoperate with other GraalVM languages. However, this requires specific compiler settings and might not support all Rust features.

Question 4

What are the performance implications of using Sulong vs native C?

Accepted Answer

Sulong adds VM interpretation overhead, so native C is faster for raw computation. However, for polyglot applications, the interoperability benefits may outweigh the performance cost, and GraalVM's optimizations help mitigate it.

Question 5

How does Sulong handle C pointers and memory management?

Accepted Answer

Sulong simulates C's memory model within GraalVM's managed environment, which can involve garbage collection interactions and potential performance hits for pointer-intensive code.

Question 6

Is Sulong suitable for embedding C libraries in Node.js applications on GraalVM?

Accepted Answer

Absolutely, Sulong allows C libraries to be called directly from JavaScript code running on GraalVM, making it easier to integrate performance-critical C code into Node.js apps without separate processes.

Sulong

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