RustyJavaC Native

Rust FFI bindings for Rusty-JavaC. Compiles to a native shared library (.dll / .so / .dylib) for JVM integration via Panama FFM or JNA.

Quick Start

Build

git clone https://github.com/CoffeePopStudio/RustyJavaC-Native.git
cd RustyJavaC-Native
cargo build --release

Produces:

• target/release/rustyjavac_native.dll (Windows)
• target/release/librustyjavac_native.so (Linux)
• target/release/librustyjavac_native.dylib (macOS)

C API

int32_t rustyjavac_compile(
    const char **source_files,
    int32_t source_count,
    const char *output_dir,
    int32_t java_version
);

Parameter	Type	Description
source_files	const char**	Null-terminated array of source file paths
source_count	int32_t	Number of entries
output_dir	const char*	Output directory (nullable)
java_version	int32_t	Java version, e.g. 25
Returns	int32_t	0 on success, non-zero on failure

Panama FFM Usage (Java 25+)

import java.lang.foreign.*;
import java.lang.invoke.MethodHandle;

var linker = Linker.nativeLinker();
var lib = SymbolLookup.libraryLookup("rustyjavac_native", Arena.global());

var compileHandle = linker.downcallHandle(
    lib.find("rustyjavac_compile").orElseThrow(),
    FunctionDescriptor.of(ValueLayout.JAVA_INT,
        ValueLayout.ADDRESS,  // const char**
        ValueLayout.JAVA_INT, // source_count
        ValueLayout.ADDRESS,  // const char*
        ValueLayout.JAVA_INT  // java_version
    )
);

try (var arena = Arena.ofConfined()) {
    var argv = arena.allocateFrom(ValueLayout.ADDRESS,
        arena.allocateFrom("HelloWorld.java"),
        arena.allocateFrom("Utils.java"));
    var outDir = arena.allocateFrom("build/classes");

    int rc = (int) compileHandle.invoke(argv, 2, outDir, 25);
    if (rc != 0) throw new RuntimeException("compilation failed");
}

Requirements

• Rust 1.85+
• Cargo

License

MIT