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src/main/java/com/semantalytics/stardog/kibble/wasm/echo/Cargo.toml
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src/main/java/com/semantalytics/stardog/kibble/wasm/echo/src/echo.rs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,93 @@ | ||
| package org.wasmer; | ||
|
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| import org.wasmer.exports.Export; | ||
| import org.wasmer.exports.Function; | ||
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| import java.lang.ClassCastException; | ||
| import java.util.HashMap; | ||
| import java.util.Map; | ||
|
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| /** | ||
| * `Exports` is a Java class that represents the set of WebAssembly exports. | ||
| * | ||
| * Example: | ||
| * <pre>{@code | ||
| * Instance instance = new Instance(wasmBytes); | ||
| * | ||
| * // Get and run an exported function. | ||
| * Object[] result = instance.exports.getFunction("sum").apply(1, 2); | ||
| * | ||
| * // Get, manually downcast, and run an exported function. | ||
| * Export sum = instance.exports.get("sum"); | ||
| * Object[] result = ((Function) sum).apply(1, 2); | ||
| * }</pre> | ||
| */ | ||
| public class Exports { | ||
| private Map<String, Export> inner; | ||
| private Instance instance; | ||
|
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| /** | ||
| * The constructor instantiates new exported functions. | ||
| * | ||
| * @param instance Instance object which holds the exports object. | ||
| */ | ||
| protected Exports(Instance instance) { | ||
| this.inner = new HashMap<String, Export>(); | ||
| this.instance = instance; | ||
| } | ||
|
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| /** | ||
| * Return the export with the name `name`. | ||
| * | ||
| * @param name Name of the export to return. | ||
| */ | ||
| public Export get(String name) { | ||
| return this.inner.get(name); | ||
| } | ||
|
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| /** | ||
| * Return the export with the name `name` as an exported function. | ||
| * | ||
| * @param name Name of the exported function. | ||
| */ | ||
| public Function getFunction(String name) throws ClassCastException { | ||
| return (Function) this.inner.get(name); | ||
| } | ||
|
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| /** | ||
| * Return the export with the name `name` as an exported memory. | ||
| * | ||
| * @param name Name of the exported memory. | ||
| */ | ||
| public Memory getMemory(String name) throws ClassCastException { | ||
| return (Memory) this.inner.get(name); | ||
| } | ||
|
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| /** | ||
| * Called by Rust to add a new exported function. | ||
| */ | ||
| private void addFunction(String name) { | ||
| this.inner.put(name, this.generateFunctionWrapper(name)); | ||
| } | ||
|
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| /** | ||
| * Called by Rust to add a new exported memory. | ||
| */ | ||
| private void addMemory(String name, Memory memory) { | ||
| this.inner.put(name, memory); | ||
| } | ||
|
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| /** | ||
| * Lambda expression for currying. | ||
| * This takes a function name and returns the function to call WebAssembly function. | ||
| */ | ||
| private java.util.function.Function<String, Function> functionWrapperGenerator = | ||
| functionName -> arguments -> this.instance.nativeCallExportedFunction(this.instance.instancePointer, functionName, arguments); | ||
|
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| /** | ||
| * Generate the exported function wrapper. | ||
| */ | ||
| private Function generateFunctionWrapper(String functionName) { | ||
| return this.functionWrapperGenerator.apply(functionName); | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,76 @@ | ||
| package org.wasmer; | ||
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| import org.scijava.nativelib.NativeLoader; | ||
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| import java.io.IOException; | ||
|
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| /** | ||
| * `Instance` is a Java class that represents a WebAssembly instance. | ||
| * | ||
| * Example: | ||
| * <pre>{@code | ||
| * Instance instance = new Instance(wasmBytes); | ||
| * }</pre> | ||
| */ | ||
| public class Instance { | ||
| /** | ||
| * Native bindings. | ||
| */ | ||
| static { | ||
| try { | ||
| NativeLoader.loadLibrary("wasmer_jni"); | ||
| } catch (IOException e) { | ||
| e.printStackTrace(); | ||
| } | ||
| } | ||
| private native long nativeInstantiate(Instance self, byte[] moduleBytes) throws RuntimeException; | ||
| private native void nativeDrop(long instancePointer); | ||
| protected native Object[] nativeCallExportedFunction(long instancePointer, String exportName, Object[] arguments) throws RuntimeException; | ||
| protected static native void nativeInitializeExportedFunctions(long instancePointer); | ||
| protected static native void nativeInitializeExportedMemories(long instancePointer); | ||
|
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| /** | ||
| * All WebAssembly exports. | ||
| */ | ||
| public final Exports exports; | ||
|
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| /** | ||
| The instance pointer. | ||
| */ | ||
| protected long instancePointer; | ||
|
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| /** | ||
| * The constructor instantiates a new WebAssembly instance based on | ||
| * WebAssembly bytes. | ||
| * | ||
| * @param moduleBytes WebAssembly bytes. | ||
| */ | ||
| public Instance(byte[] moduleBytes) throws RuntimeException { | ||
| this.exports = new Exports(this); | ||
|
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| long instancePointer = this.nativeInstantiate(this, moduleBytes); | ||
| this.instancePointer = instancePointer; | ||
|
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| this.nativeInitializeExportedFunctions(instancePointer); | ||
| this.nativeInitializeExportedMemories(instancePointer); | ||
| } | ||
|
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| protected Instance() { | ||
| this.exports = new Exports(this); | ||
| } | ||
|
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| /** | ||
| * Delete an instance object pointer. | ||
| */ | ||
| public void close() { | ||
| this.nativeDrop(this.instancePointer); | ||
| } | ||
|
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| /** | ||
| * Delete an instance object pointer, which is called by the garbage collector | ||
| * before an object is removed from the memory. | ||
| */ | ||
| public void finalize() { | ||
| this.close(); | ||
| } | ||
| } |
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