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/// Memory lifetime of closures in Swift are managed by Swift side

class SwiftClosureDeallocator {

constructor(exports) {

if (typeof FinalizationRegistry === "undefined") {

throw new Error("The Swift part of JavaScriptKit was configured to require " +

"the availability of JavaScript WeakRefs. Please build " +

"with `-Xswiftc -DJAVASCRIPTKIT_WITHOUT_WEAKREFS` to " +

"disable features that use WeakRefs.");

}

this.functionRegistry = new FinalizationRegistry((id) => {

exports.swjs_free_host_function(id);

});

}

track(func, func_ref) {

this.functionRegistry.register(func, func_ref);

}

function assertNever(x, message) {

throw new Error(message);

}

const decode = (kind, payload1, payload2, memory) => {

switch (kind) {

case 0 /* Boolean */:

switch (payload1) {

case 0:

return false;

case 1:

return true;

}

case 2 /* Number */:

return payload2;

case 1 /* String */:

case 3 /* Object */:

case 6 /* Function */:

case 7 /* Symbol */:

case 8 /* BigInt */:

return memory.getObject(payload1);

case 4 /* Null */:

return null;

case 5 /* Undefined */:

return undefined;

default:

assertNever(kind, `JSValue Type kind "${kind}" is not supported`);

}

};

// Note:

// `decodeValues` assumes that the size of RawJSValue is 16.

const decodeArray = (ptr, length, memory) => {

let result = [];

for (let index = 0; index < length; index++) {

const base = ptr + 16 * index;

const kind = memory.readUint32(base);

const payload1 = memory.readUint32(base + 4);

const payload2 = memory.readFloat64(base + 8);

result.push(decode(kind, payload1, payload2, memory));

}

return result;

};

const write = (value, kind_ptr, payload1_ptr, payload2_ptr, is_exception, memory) => {

const exceptionBit = (is_exception ? 1 : 0) << 31;

if (value === null) {

memory.writeUint32(kind_ptr, exceptionBit | 4 /* Null */);

return;

}

const writeRef = (kind) => {

memory.writeUint32(kind_ptr, exceptionBit | kind);

memory.writeUint32(payload1_ptr, memory.retain(value));

};

const type = typeof value;

switch (type) {

case "boolean": {

memory.writeUint32(kind_ptr, exceptionBit | 0 /* Boolean */);

memory.writeUint32(payload1_ptr, value ? 1 : 0);

break;

}

case "number": {

memory.writeUint32(kind_ptr, exceptionBit | 2 /* Number */);

memory.writeFloat64(payload2_ptr, value);

break;

}

case "string": {

writeRef(1 /* String */);

break;

}

case "undefined": {

memory.writeUint32(kind_ptr, exceptionBit | 5 /* Undefined */);

break;

}

case "object": {

writeRef(3 /* Object */);

break;

}

case "function": {

writeRef(6 /* Function */);

break;

}

case "symbol": {

writeRef(7 /* Symbol */);

break;

}

case "bigint": {

writeRef(8 /* BigInt */);

break;

}

default:

assertNever(type, `Type "${type}" is not supported yet`);

}

};

let globalVariable;

if (typeof globalThis !== "undefined") {

globalVariable = globalThis;

}

else if (typeof window !== "undefined") {

globalVariable = window;

}

else if (typeof global !== "undefined") {

globalVariable = global;

}

else if (typeof self !== "undefined") {

globalVariable = self;

}

class SwiftRuntimeHeap {

constructor() {

this._heapValueById = new Map();

this._heapValueById.set(0, globalVariable);

this._heapEntryByValue = new Map();

this._heapEntryByValue.set(globalVariable, { id: 0, rc: 1 });

// Note: 0 is preserved for global

this._heapNextKey = 1;

}

retain(value) {

const entry = this._heapEntryByValue.get(value);

if (entry) {

entry.rc++;

return entry.id;

}

const id = this._heapNextKey++;

this._heapValueById.set(id, value);

this._heapEntryByValue.set(value, { id: id, rc: 1 });

return id;

}

release(ref) {

const value = this._heapValueById.get(ref);

const entry = this._heapEntryByValue.get(value);

entry.rc--;

if (entry.rc != 0)

return;

this._heapEntryByValue.delete(value);

this._heapValueById.delete(ref);

}

referenceHeap(ref) {

const value = this._heapValueById.get(ref);

if (value === undefined) {

throw new ReferenceError("Attempted to read invalid reference " + ref);

}

return value;

}

class Memory {

constructor(exports) {

this.heap = new SwiftRuntimeHeap();

this.retain = (value) => this.heap.retain(value);

this.getObject = (ref) => this.heap.referenceHeap(ref);

this.release = (ref) => this.heap.release(ref);

this.bytes = () => new Uint8Array(this.rawMemory.buffer);

this.dataView = () => new DataView(this.rawMemory.buffer);

this.writeBytes = (ptr, bytes) => this.bytes().set(bytes, ptr);

this.readUint32 = (ptr) => this.dataView().getUint32(ptr, true);

this.readUint64 = (ptr) => this.dataView().getBigUint64(ptr, true);

this.readInt64 = (ptr) => this.dataView().getBigInt64(ptr, true);

this.readFloat64 = (ptr) => this.dataView().getFloat64(ptr, true);

this.writeUint32 = (ptr, value) => this.dataView().setUint32(ptr, value, true);

this.writeUint64 = (ptr, value) => this.dataView().setBigUint64(ptr, value, true);

this.writeInt64 = (ptr, value) => this.dataView().setBigInt64(ptr, value, true);

this.writeFloat64 = (ptr, value) => this.dataView().setFloat64(ptr, value, true);

this.rawMemory = exports.memory;

}

class SwiftRuntime {

constructor() {

this.version = 708;

this.textDecoder = new TextDecoder("utf-8");

this.textEncoder = new TextEncoder(); // Only support utf-8

/** @deprecated Use `wasmImports` instead */

this.importObjects = () => this.wasmImports;

this.wasmImports = {

swjs_set_prop: (ref, name, kind, payload1, payload2) => {

const obj = this.memory.getObject(ref);

const key = this.memory.getObject(name);

const value = decode(kind, payload1, payload2, this.memory);

obj[key] = value;

swjs_get_prop: (ref, name, kind_ptr, payload1_ptr, payload2_ptr) => {

const obj = this.memory.getObject(ref);

const key = this.memory.getObject(name);

const result = obj[key];

write(result, kind_ptr, payload1_ptr, payload2_ptr, false, this.memory);

swjs_set_subscript: (ref, index, kind, payload1, payload2) => {

const obj = this.memory.getObject(ref);

const value = decode(kind, payload1, payload2, this.memory);

obj[index] = value;

swjs_get_subscript: (ref, index, kind_ptr, payload1_ptr, payload2_ptr) => {

const obj = this.memory.getObject(ref);

const result = obj[index];

write(result, kind_ptr, payload1_ptr, payload2_ptr, false, this.memory);

swjs_encode_string: (ref, bytes_ptr_result) => {

const bytes = this.textEncoder.encode(this.memory.getObject(ref));

const bytes_ptr = this.memory.retain(bytes);

this.memory.writeUint32(bytes_ptr_result, bytes_ptr);

return bytes.length;

swjs_decode_string: (bytes_ptr, length) => {

const bytes = this.memory

.bytes()

.subarray(bytes_ptr, bytes_ptr + length);

const string = this.textDecoder.decode(bytes);

return this.memory.retain(string);

swjs_load_string: (ref, buffer) => {

const bytes = this.memory.getObject(ref);

this.memory.writeBytes(buffer, bytes);

swjs_call_function: (ref, argv, argc, kind_ptr, payload1_ptr, payload2_ptr) => {

const func = this.memory.getObject(ref);

let result;

try {

const args = decodeArray(argv, argc, this.memory);

result = func(...args);

}

catch (error) {

write(error, kind_ptr, payload1_ptr, payload2_ptr, true, this.memory);

return;

}

write(result, kind_ptr, payload1_ptr, payload2_ptr, false, this.memory);

swjs_call_function_no_catch: (ref, argv, argc, kind_ptr, payload1_ptr, payload2_ptr) => {

const func = this.memory.getObject(ref);

let isException = true;

try {

const args = decodeArray(argv, argc, this.memory);

const result = func(...args);

write(result, kind_ptr, payload1_ptr, payload2_ptr, false, this.memory);

isException = false;

}

finally {

if (isException) {

write(undefined, kind_ptr, payload1_ptr, payload2_ptr, true, this.memory);

}

swjs_call_function_with_this: (obj_ref, func_ref, argv, argc, kind_ptr, payload1_ptr, payload2_ptr) => {

const obj = this.memory.getObject(obj_ref);

const func = this.memory.getObject(func_ref);

let result;

try {

const args = decodeArray(argv, argc, this.memory);

result = func.apply(obj, args);

}

catch (error) {

write(error, kind_ptr, payload1_ptr, payload2_ptr, true, this.memory);

return;

}

write(result, kind_ptr, payload1_ptr, payload2_ptr, false, this.memory);

swjs_call_function_with_this_no_catch: (obj_ref, func_ref, argv, argc, kind_ptr, payload1_ptr, payload2_ptr) => {

const obj = this.memory.getObject(obj_ref);

const func = this.memory.getObject(func_ref);

let isException = true;

try {

const args = decodeArray(argv, argc, this.memory);

const result = func.apply(obj, args);

write(result, kind_ptr, payload1_ptr, payload2_ptr, false, this.memory);

isException = false;

}

finally {

if (isException) {

write(undefined, kind_ptr, payload1_ptr, payload2_ptr, true, this.memory);

}

swjs_call_new: (ref, argv, argc) => {

const constructor = this.memory.getObject(ref);

const args = decodeArray(argv, argc, this.memory);

const instance = new constructor(...args);

return this.memory.retain(instance);

swjs_call_throwing_new: (ref, argv, argc, exception_kind_ptr, exception_payload1_ptr, exception_payload2_ptr) => {

const constructor = this.memory.getObject(ref);

let result;

try {

const args = decodeArray(argv, argc, this.memory);

result = new constructor(...args);

}

catch (error) {

write(error, exception_kind_ptr, exception_payload1_ptr, exception_payload2_ptr, true, this.memory);

return -1;

}

write(null, exception_kind_ptr, exception_payload1_ptr, exception_payload2_ptr, false, this.memory);

return this.memory.retain(result);

swjs_instanceof: (obj_ref, constructor_ref) => {

const obj = this.memory.getObject(obj_ref);

const constructor = this.memory.getObject(constructor_ref);

return obj instanceof constructor;

swjs_create_function: (host_func_id, line, file) => {

var _a;

const fileString = this.memory.getObject(file);

const func = (...args) => this.callHostFunction(host_func_id, line, fileString, args);

const func_ref = this.memory.retain(func);

(_a = this.closureDeallocator) === null || _a === void 0 ? void 0 : _a.track(func, func_ref);

return func_ref;

swjs_create_typed_array: (constructor_ref, elementsPtr, length) => {

const ArrayType = this.memory.getObject(constructor_ref);

const array = new ArrayType(this.memory.rawMemory.buffer, elementsPtr, length);

// Call `.slice()` to copy the memory

return this.memory.retain(array.slice());

swjs_load_typed_array: (ref, buffer) => {

const typedArray = this.memory.getObject(ref);

const bytes = new Uint8Array(typedArray.buffer);

this.memory.writeBytes(buffer, bytes);

swjs_release: (ref) => {

this.memory.release(ref);

swjs_i64_to_bigint: (value, signed) => {

return this.memory.retain(signed ? value : BigInt.asUintN(64, value));

swjs_bigint_to_i64: (ref, signed) => {

const object = this.memory.getObject(ref);

if (typeof object !== "bigint") {

throw new Error(`Expected a BigInt, but got ${typeof object}`);

}

if (signed) {

return object;

}

else {

if (object < BigInt(0)) {

return BigInt(0);

}

return BigInt.asIntN(64, object);

}

};

this._instance = null;

this._memory = null;

this._closureDeallocator = null;

}

setInstance(instance) {

this._instance = instance;

if (this.exports.swjs_library_version() != this.version) {

throw new Error(`The versions of JavaScriptKit are incompatible.

WebAssembly runtime ${this.exports.swjs_library_version()} != JS runtime ${this.version}`);

}

get instance() {

if (!this._instance)

throw new Error("WebAssembly instance is not set yet");

return this._instance;

}

get exports() {

return this.instance.exports;

}

get memory() {

if (!this._memory) {

this._memory = new Memory(this.instance.exports);

}

return this._memory;

}

get closureDeallocator() {

if (this._closureDeallocator)

return this._closureDeallocator;

const features = this.exports.swjs_library_features();

const librarySupportsWeakRef = (features & 1 /* WeakRefs */) != 0;

if (librarySupportsWeakRef) {

this._closureDeallocator = new SwiftClosureDeallocator(this.exports);

}

return this._closureDeallocator;

}

callHostFunction(host_func_id, line, file, args) {

const argc = args.length;

const argv = this.exports.swjs_prepare_host_function_call(argc);

for (let index = 0; index < args.length; index++) {

const argument = args[index];

const base = argv + 16 * index;

write(argument, base, base + 4, base + 8, false, this.memory);

}

let output;

// This ref is released by the swjs_call_host_function implementation

const callback_func_ref = this.memory.retain((result) => {

output = result;

});

const alreadyReleased = this.exports.swjs_call_host_function(host_func_id, argv, argc, callback_func_ref);

if (alreadyReleased) {

throw new Error(`The JSClosure has been already released by Swift side. The closure is created at ${file}:${line}`);

}

this.exports.swjs_cleanup_host_function_call(argv);

return output;

}

export { SwiftRuntime };