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keynmolkeynmol
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Makefile and make it pure Java
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‎.gitignore

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project/target
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project/project
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.metals
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.bloop
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.vscode
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*.class
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*.sjsr
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project/.bloop
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.sbt
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modules/core/target
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root/target
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target
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.bsp
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*.log
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project/metals.sbt
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.scala-build

‎.scalafmt.conf

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version = "3.8.6"
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runner.dialect = scala3
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rewrite.scala3.insertEndMarkerMinLines = 10
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rewrite.scala3.removeOptionalBraces = true
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rewrite.scala3.convertToNewSyntax = true
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align.preset = more
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fileOverride {
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"glob:**.sbt" {
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runner.dialect = scala212source3
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}
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"glob:**/project/plugins.sbt" {
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runner.dialect = scala212source3
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newlines.topLevelStatementBlankLines = [
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{
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blanks = 1,
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minBreaks = 0
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}
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]
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}
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}
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rewrite {
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trailingCommas.style = "always"
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}

‎Makefile

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SHARED_EXT := $(shell [ "$$(uname)" = "Darwin" ] && echo "dylib" || echo "so")
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jextract:
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jextract --output java-side/ --target-package myscalalib_bindings interface.h
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bindgen:
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sn-bindgen --header interface.h --package myscalalib --export --flavour scala-native05 --scala --out scala-native-side/interface.scala
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scala-lib:
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cd scala-native-side && scala-cli package . -f -o ../scala-lib.$(SHARED_EXT)
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run: scala-lib
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cd java-side && scala-cli run . -- ../scala-lib.$(SHARED_EXT)
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‎interface.h

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extern int myscalalib_exports(int i, int r);
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typedef struct {
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char a;
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char b;
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} myscalalib_struct;
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extern void myscalalib_complex(int times, myscalalib_struct* clamp, char* result);
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extern int ScalaNativeInit(void);

‎java-side/Main.java

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//> using jvm 23
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//> using javaOpt --enable-native-access=ALL-UNNAMED
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import myscalalib_bindings.*;
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import java.nio.file.Paths;
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public class Main {
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public static void main(String[] args) {
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String dylibPath = null;
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if (args.length != 1) {
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System.err.println("First argument has to be path to dynamic library");
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System.exit(1);
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} else {
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dylibPath = args[0];
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}
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var p = Paths.get(dylibPath).toAbsolutePath().toString();
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System.load(p);
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assert (interface_h.ScalaNativeInit() == 0);
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System.out.println(interface_h.myscalalib_exports(25, 50));
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}
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}

‎java-side/myscalalib_bindings/interface_h.java

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// Generated by jextract
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package myscalalib_bindings;
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import java.lang.invoke.*;
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import java.lang.foreign.*;
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import java.nio.ByteOrder;
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import java.util.*;
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import java.util.function.*;
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import java.util.stream.*;
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import static java.lang.foreign.ValueLayout.*;
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import static java.lang.foreign.MemoryLayout.PathElement.*;
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public class interface_h {
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interface_h() {
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// Should not be called directly
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}
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static final Arena LIBRARY_ARENA = Arena.ofAuto();
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static final boolean TRACE_DOWNCALLS = Boolean.getBoolean("jextract.trace.downcalls");
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static void traceDowncall(String name, Object... args) {
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String traceArgs = Arrays.stream(args)
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.map(Object::toString)
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.collect(Collectors.joining(", "));
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System.out.printf("%s(%s)\n", name, traceArgs);
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}
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static MemorySegment findOrThrow(String symbol) {
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return SYMBOL_LOOKUP.find(symbol)
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.orElseThrow(() -> new UnsatisfiedLinkError("unresolved symbol: " + symbol));
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}
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static MethodHandle upcallHandle(Class<?> fi, String name, FunctionDescriptor fdesc) {
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try {
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return MethodHandles.lookup().findVirtual(fi, name, fdesc.toMethodType());
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} catch (ReflectiveOperationException ex) {
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throw new AssertionError(ex);
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}
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}
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static MemoryLayout align(MemoryLayout layout, long align) {
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return switch (layout) {
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case PaddingLayout p -> p;
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case ValueLayout v -> v.withByteAlignment(align);
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case GroupLayout g -> {
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MemoryLayout[] alignedMembers = g.memberLayouts().stream()
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.map(m -> align(m, align)).toArray(MemoryLayout[]::new);
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yield g instanceof StructLayout ?
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MemoryLayout.structLayout(alignedMembers) : MemoryLayout.unionLayout(alignedMembers);
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}
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case SequenceLayout s -> MemoryLayout.sequenceLayout(s.elementCount(), align(s.elementLayout(), align));
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};
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}
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static final SymbolLookup SYMBOL_LOOKUP = SymbolLookup.loaderLookup()
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.or(Linker.nativeLinker().defaultLookup());
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public static final ValueLayout.OfBoolean C_BOOL = ValueLayout.JAVA_BOOLEAN;
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public static final ValueLayout.OfByte C_CHAR = ValueLayout.JAVA_BYTE;
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public static final ValueLayout.OfShort C_SHORT = ValueLayout.JAVA_SHORT;
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public static final ValueLayout.OfInt C_INT = ValueLayout.JAVA_INT;
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public static final ValueLayout.OfLong C_LONG_LONG = ValueLayout.JAVA_LONG;
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public static final ValueLayout.OfFloat C_FLOAT = ValueLayout.JAVA_FLOAT;
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public static final ValueLayout.OfDouble C_DOUBLE = ValueLayout.JAVA_DOUBLE;
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public static final AddressLayout C_POINTER = ValueLayout.ADDRESS
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.withTargetLayout(MemoryLayout.sequenceLayout(java.lang.Long.MAX_VALUE, JAVA_BYTE));
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public static final ValueLayout.OfLong C_LONG = ValueLayout.JAVA_LONG;
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private static class myscalalib_exports {
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public static final FunctionDescriptor DESC = FunctionDescriptor.of(
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interface_h.C_INT,
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interface_h.C_INT,
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interface_h.C_INT
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);
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public static final MemorySegment ADDR = interface_h.findOrThrow("myscalalib_exports");
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public static final MethodHandle HANDLE = Linker.nativeLinker().downcallHandle(ADDR, DESC);
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}
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/**
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* Function descriptor for:
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* {@snippet lang=c :
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* extern int myscalalib_exports(int i, int r)
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* }
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*/
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public static FunctionDescriptor myscalalib_exports$descriptor() {
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return myscalalib_exports.DESC;
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}
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/**
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* Downcall method handle for:
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* {@snippet lang=c :
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* extern int myscalalib_exports(int i, int r)
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* }
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*/
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public static MethodHandle myscalalib_exports$handle() {
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return myscalalib_exports.HANDLE;
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}
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/**
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* Address for:
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* {@snippet lang=c :
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* extern int myscalalib_exports(int i, int r)
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* }
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*/
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public static MemorySegment myscalalib_exports$address() {
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return myscalalib_exports.ADDR;
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}
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/**
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* {@snippet lang=c :
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* extern int myscalalib_exports(int i, int r)
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* }
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*/
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public static int myscalalib_exports(int i, int r) {
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var mh$ = myscalalib_exports.HANDLE;
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try {
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if (TRACE_DOWNCALLS) {
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traceDowncall("myscalalib_exports", i, r);
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}
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return (int)mh$.invokeExact(i, r);
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} catch (Throwable ex$) {
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throw new AssertionError("should not reach here", ex$);
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}
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}
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private static class myscalalib_complex {
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public static final FunctionDescriptor DESC = FunctionDescriptor.ofVoid(
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interface_h.C_INT,
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interface_h.C_POINTER,
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interface_h.C_POINTER
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);
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public static final MemorySegment ADDR = interface_h.findOrThrow("myscalalib_complex");
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public static final MethodHandle HANDLE = Linker.nativeLinker().downcallHandle(ADDR, DESC);
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}
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/**
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* Function descriptor for:
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* {@snippet lang=c :
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* extern void myscalalib_complex(int times, myscalalib_struct *clamp, char *result)
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* }
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*/
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public static FunctionDescriptor myscalalib_complex$descriptor() {
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return myscalalib_complex.DESC;
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}
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/**
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* Downcall method handle for:
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* {@snippet lang=c :
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* extern void myscalalib_complex(int times, myscalalib_struct *clamp, char *result)
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* }
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*/
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public static MethodHandle myscalalib_complex$handle() {
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return myscalalib_complex.HANDLE;
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}
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/**
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* Address for:
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* {@snippet lang=c :
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* extern void myscalalib_complex(int times, myscalalib_struct *clamp, char *result)
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* }
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*/
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public static MemorySegment myscalalib_complex$address() {
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return myscalalib_complex.ADDR;
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}
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/**
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* {@snippet lang=c :
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* extern void myscalalib_complex(int times, myscalalib_struct *clamp, char *result)
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* }
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*/
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public static void myscalalib_complex(int times, MemorySegment clamp, MemorySegment result) {
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var mh$ = myscalalib_complex.HANDLE;
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try {
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if (TRACE_DOWNCALLS) {
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traceDowncall("myscalalib_complex", times, clamp, result);
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}
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mh$.invokeExact(times, clamp, result);
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} catch (Throwable ex$) {
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throw new AssertionError("should not reach here", ex$);
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}
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}
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private static class ScalaNativeInit {
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public static final FunctionDescriptor DESC = FunctionDescriptor.of(
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interface_h.C_INT );
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public static final MemorySegment ADDR = interface_h.findOrThrow("ScalaNativeInit");
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public static final MethodHandle HANDLE = Linker.nativeLinker().downcallHandle(ADDR, DESC);
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}
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/**
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* Function descriptor for:
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* {@snippet lang=c :
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* extern int ScalaNativeInit()
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* }
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*/
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public static FunctionDescriptor ScalaNativeInit$descriptor() {
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return ScalaNativeInit.DESC;
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}
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/**
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* Downcall method handle for:
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* {@snippet lang=c :
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* extern int ScalaNativeInit()
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* }
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*/
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public static MethodHandle ScalaNativeInit$handle() {
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return ScalaNativeInit.HANDLE;
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}
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/**
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* Address for:
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* {@snippet lang=c :
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* extern int ScalaNativeInit()
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* }
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*/
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public static MemorySegment ScalaNativeInit$address() {
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return ScalaNativeInit.ADDR;
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}
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/**
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* {@snippet lang=c :
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* extern int ScalaNativeInit()
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* }
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*/
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public static int ScalaNativeInit() {
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var mh$ = ScalaNativeInit.HANDLE;
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try {
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if (TRACE_DOWNCALLS) {
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traceDowncall("ScalaNativeInit");
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}
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return (int)mh$.invokeExact();
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} catch (Throwable ex$) {
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throw new AssertionError("should not reach here", ex$);
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}
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}
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}
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