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{ maybeAsyncFn } from \"./asyncify-helpers\"\nimport { QuickJSContext } from \"./context\"\nimport { debugLog } from \"./debug\"\nimport { EitherModule } from \"./emscripten-types\"\nimport { QuickJSWrongOwner } from \"./errors\"\nimport {\n BorrowedHeapCharPointer,\n JSContextPointer,\n JSContextPointerPointer,\n JSModuleDefPointer,\n JSRuntimePointer,\n} from \"./types-ffi\"\nimport { Disposable, Lifetime, Scope } from \"./lifetime\"\nimport { ModuleMemory } from \"./memory\"\nimport { QuickJSModuleCallbacks, RuntimeCallbacks } from \"./module\"\nimport {\n ContextOptions,\n DefaultIntrinsics,\n EitherFFI,\n JSModuleLoader,\n JSModuleNormalizer,\n QuickJSHandle,\n} from \"./types\"\nimport { SuccessOrFail } from \"./vm-interface\"\n\n/**\n * Callback called regularly while the VM executes code.\n * Determines if a VM's execution should be interrupted.\n *\n * @returns `true` to interrupt JS execution inside the VM.\n * @returns `false` or `undefined` to continue JS execution inside the VM.\n */\nexport type InterruptHandler = (runtime: QuickJSRuntime) => boolean | undefined\n\n/**\n * Used as an optional for the results of executing pendingJobs.\n * On success, `value` contains the number of async jobs executed\n * by the runtime.\n * @source\n */\nexport type ExecutePendingJobsResult = SuccessOrFail<\n /** Number of jobs successfully executed. */\n number,\n /** The error that occurred. */\n QuickJSHandle & {\n /** The context where the error occurred. */\n context: QuickJSContext\n }\n>\n\n/**\n * A runtime represents a Javascript runtime corresponding to an object heap.\n * Several runtimes can exist at the same time but they cannot exchange objects.\n * Inside a given runtime, no multi-threading is supported.\n *\n * You can think of separate runtimes like different domains in a browser, and\n * the contexts within a runtime like the different windows open to the same\n * domain.\n *\n * Create a runtime via {@link QuickJSWASMModule.newRuntime}.\n *\n * You should create separate runtime instances for untrusted code from\n * different sources for isolation. However, stronger isolation is also\n * available (at the cost of memory usage), by creating separate WebAssembly\n * modules to further isolate untrusted code.\n * See {@link newQuickJSWASMModule}.\n *\n * Implement memory and CPU constraints with [[setInterruptHandler]]\n * (called regularly while the interpreter runs), [[setMemoryLimit]], and\n * [[setMaxStackSize]].\n * Use [[computeMemoryUsage]] or [[dumpMemoryUsage]] to guide memory limit\n * tuning.\n *\n * Configure ES module loading with [[setModuleLoader]].\n */\nexport class QuickJSRuntime implements Disposable {\n /**\n * If this runtime was created as as part of a context, points to the context\n * associated with the runtime.\n *\n * If this runtime was created stand-alone, this may or may not contain a context.\n * A context here may be allocated if one is needed by the runtime, eg for [[computeMemoryUsage]].\n */\n public context: QuickJSContext | undefined\n\n /** @private */\n protected module: EitherModule\n /** @private */\n protected memory: ModuleMemory\n /** @private */\n protected ffi: EitherFFI\n /** @private */\n protected rt: Lifetime<JSRuntimePointer>\n /** @private */\n protected callbacks: QuickJSModuleCallbacks\n /** @private */\n protected scope = new Scope()\n\n /** @private */\n protected contextMap = new Map<JSContextPointer, QuickJSContext>()\n /** @private */\n protected moduleLoader: JSModuleLoader | undefined\n /** @private */\n protected moduleNormalizer: JSModuleNormalizer | undefined\n\n /** @private */\n constructor(args: {\n module: EitherModule\n ffi: EitherFFI\n rt: Lifetime<JSRuntimePointer>\n callbacks: QuickJSModuleCallbacks\n ownedLifetimes?: Disposable[]\n }) {\n args.ownedLifetimes?.forEach((lifetime) => this.scope.manage(lifetime))\n this.module = args.module\n this.memory = new ModuleMemory(this.module)\n this.ffi = args.ffi\n this.rt = args.rt\n this.callbacks = args.callbacks\n this.scope.manage(this.rt)\n this.callbacks.setRuntimeCallbacks(this.rt.value, this.cToHostCallbacks)\n\n this.executePendingJobs = this.executePendingJobs.bind(this)\n }\n\n get alive() {\n return this.scope.alive\n }\n\n dispose() {\n return this.scope.dispose()\n }\n\n newContext(options: ContextOptions = {}): QuickJSContext {\n if (options.intrinsics && options.intrinsics !== DefaultIntrinsics) {\n throw new Error(\"TODO: Custom intrinsics are not supported yet\")\n }\n\n const ctx = new Lifetime(\n options.contextPointer || this.ffi.QTS_NewContext(this.rt.value),\n undefined,\n (ctx_ptr) => {\n this.contextMap.delete(ctx_ptr)\n this.callbacks.deleteContext(ctx_ptr)\n this.ffi.QTS_FreeContext(ctx_ptr)\n }\n )\n\n const context = new QuickJSContext({\n module: this.module,\n ctx,\n ffi: this.ffi,\n rt: this.rt,\n ownedLifetimes: options.ownedLifetimes,\n runtime: this,\n callbacks: this.callbacks,\n })\n this.contextMap.set(ctx.value, context)\n\n return context\n }\n\n /**\n * Set the loader for EcmaScript modules requested by any context in this\n * runtime.\n *\n * The loader can be removed with [[removeModuleLoader]].\n */\n setModuleLoader(moduleLoader: JSModuleLoader, moduleNormalizer?: JSModuleNormalizer): void {\n this.moduleLoader = moduleLoader\n this.moduleNormalizer = moduleNormalizer\n this.ffi.QTS_RuntimeEnableModuleLoader(this.rt.value, this.moduleNormalizer ? 1 : 0)\n }\n\n /**\n * Remove the the loader set by [[setModuleLoader]]. This disables module loading.\n */\n removeModuleLoader(): void {\n this.moduleLoader = undefined\n this.ffi.QTS_RuntimeDisableModuleLoader(this.rt.value)\n }\n\n // Runtime management -------------------------------------------------------\n\n /**\n * In QuickJS, promises and async functions create pendingJobs. These do not execute\n * immediately and need to be run by calling [[executePendingJobs]].\n *\n * @return true if there is at least one pendingJob queued up.\n */\n hasPendingJob(): boolean {\n return Boolean(this.ffi.QTS_IsJobPending(this.rt.value))\n }\n\n private interruptHandler: InterruptHandler | undefined\n\n /**\n * Set a callback which is regularly called by the QuickJS engine when it is\n * executing code. This callback can be used to implement an execution\n * timeout.\n *\n * The interrupt handler can be removed with [[removeInterruptHandler]].\n */\n setInterruptHandler(cb: InterruptHandler) {\n const prevInterruptHandler = this.interruptHandler\n this.interruptHandler = cb\n if (!prevInterruptHandler) {\n this.ffi.QTS_RuntimeEnableInterruptHandler(this.rt.value)\n }\n }\n\n /**\n * Remove the interrupt handler, if any.\n * See [[setInterruptHandler]].\n */\n removeInterruptHandler() {\n if (this.interruptHandler) {\n this.ffi.QTS_RuntimeDisableInterruptHandler(this.rt.value)\n this.interruptHandler = undefined\n }\n }\n\n /**\n * Execute pendingJobs on the runtime until `maxJobsToExecute` jobs are\n * executed (default all pendingJobs), the queue is exhausted, or the runtime\n * encounters an exception.\n *\n * In QuickJS, promises and async functions *inside the runtime* create\n * pendingJobs. These do not execute immediately and need to triggered to run.\n *\n * @param maxJobsToExecute - When negative, run all pending jobs. Otherwise execute\n * at most `maxJobsToExecute` before returning.\n *\n * @return On success, the number of executed jobs. On error, the exception\n * that stopped execution, and the context it occurred in. Note that\n * executePendingJobs will not normally return errors thrown inside async\n * functions or rejected promises. Those errors are available by calling\n * [[resolvePromise]] on the promise handle returned by the async function.\n */\n executePendingJobs(maxJobsToExecute: number | void = -1): ExecutePendingJobsResult {\n const ctxPtrOut = this.memory.newMutablePointerArray<JSContextPointerPointer>(1)\n const valuePtr = this.ffi.QTS_ExecutePendingJob(\n this.rt.value,\n maxJobsToExecute ?? -1,\n ctxPtrOut.value.ptr\n )\n\n const ctxPtr = ctxPtrOut.value.typedArray[0] as JSContextPointer\n ctxPtrOut.dispose()\n if (ctxPtr === 0) {\n // No jobs executed.\n this.ffi.QTS_FreeValuePointerRuntime(this.rt.value, valuePtr)\n return { value: 0 }\n }\n\n const context =\n this.contextMap.get(ctxPtr) ??\n this.newContext({\n contextPointer: ctxPtr,\n })\n\n const resultValue = context.getMemory(this.rt.value).heapValueHandle(valuePtr)\n const typeOfRet = context.typeof(resultValue)\n if (typeOfRet === \"number\") {\n const executedJobs = context.getNumber(resultValue)\n resultValue.dispose()\n return { value: executedJobs }\n } else {\n const error = Object.assign(resultValue, { context })\n return {\n error,\n }\n }\n }\n\n /**\n * Set the max memory this runtime can allocate.\n * To remove the limit, set to `-1`.\n */\n setMemoryLimit(limitBytes: number) {\n if (limitBytes < 0 && limitBytes !== -1) {\n throw new Error(\"Cannot set memory limit to negative number. To unset, pass -1\")\n }\n\n this.ffi.QTS_RuntimeSetMemoryLimit(this.rt.value, limitBytes)\n }\n\n /**\n * Compute memory usage for this runtime. Returns the result as a handle to a\n * JSValue object. Use [[QuickJSContext.dump]] to convert to a native object.\n * Calling this method will allocate more memory inside the runtime. The information\n * is accurate as of just before the call to `computeMemoryUsage`.\n * For a human-digestible representation, see [[dumpMemoryUsage]].\n */\n computeMemoryUsage(): QuickJSHandle {\n const serviceContextMemory = this.getSystemContext().getMemory(this.rt.value)\n return serviceContextMemory.heapValueHandle(\n this.ffi.QTS_RuntimeComputeMemoryUsage(this.rt.value, serviceContextMemory.ctx.value)\n )\n }\n\n /**\n * @returns a human-readable description of memory usage in this runtime.\n * For programmatic access to this information, see [[computeMemoryUsage]].\n */\n dumpMemoryUsage(): string {\n return this.memory.consumeHeapCharPointer(this.ffi.QTS_RuntimeDumpMemoryUsage(this.rt.value))\n }\n\n /**\n * Set the max stack size for this runtime, in bytes.\n * To remove the limit, set to `0`.\n */\n setMaxStackSize(stackSize: number) {\n if (stackSize < 0) {\n throw new Error(\"Cannot set memory limit to negative number. To unset, pass 0.\")\n }\n\n this.ffi.QTS_RuntimeSetMaxStackSize(this.rt.value, stackSize)\n }\n\n /**\n * Assert that `handle` is owned by this runtime.\n * @throws QuickJSWrongOwner if owned by a different runtime.\n */\n assertOwned(handle: QuickJSHandle) {\n if (handle.owner && handle.owner.rt !== this.rt) {\n throw new QuickJSWrongOwner(\n `Handle is not owned by this runtime: ${handle.owner.rt.value} != ${this.rt.value}`\n )\n }\n }\n\n private getSystemContext() {\n if (!this.context) {\n // We own this context and should dispose of it.\n this.context = this.scope.manage(this.newContext())\n }\n return this.context\n }\n\n private cToHostCallbacks: RuntimeCallbacks = {\n shouldInterrupt: (rt) => {\n if (rt !== this.rt.value) {\n throw new Error(\"QuickJSContext instance received C -> JS interrupt with mismatched rt\")\n }\n\n const fn = this.interruptHandler\n if (!fn) {\n throw new Error(\"QuickJSContext had no interrupt handler\")\n }\n\n return fn(this) ? 1 : 0\n },\n\n loadModuleSource: maybeAsyncFn(this, function* (awaited, rt, ctx, moduleName) {\n const moduleLoader = this.moduleLoader\n if (!moduleLoader) {\n throw new Error(\"Runtime has no module loader\")\n }\n\n if (rt !== this.rt.value) {\n throw new Error(\"Runtime pointer mismatch\")\n }\n\n const context =\n this.contextMap.get(ctx) ??\n this.newContext({\n contextPointer: ctx,\n })\n\n try {\n const result = yield* awaited(moduleLoader(moduleName, context))\n\n if (typeof result === \"object\" && \"error\" in result && result.error) {\n debugLog(\"cToHostLoadModule: loader returned error\", result.error)\n throw result.error\n }\n\n const moduleSource =\n typeof result === \"string\" ? result : \"value\" in result ? result.value : result\n\n return this.memory.newHeapCharPointer(moduleSource).value\n } catch (error) {\n debugLog(\"cToHostLoadModule: caught error\", error)\n context.throw(error as any)\n return 0 as BorrowedHeapCharPointer\n }\n }),\n\n normalizeModule: maybeAsyncFn(\n this,\n function* (awaited, rt, ctx, baseModuleName, moduleNameRequest) {\n const moduleNormalizer = this.moduleNormalizer\n if (!moduleNormalizer) {\n throw new Error(\"Runtime has no module normalizer\")\n }\n\n if (rt !== this.rt.value) {\n throw new Error(\"Runtime pointer mismatch\")\n }\n\n const context =\n this.contextMap.get(ctx) ??\n this.newContext({\n /* TODO: Does this happen? Are we responsible for disposing? I don't think so */\n contextPointer: ctx,\n })\n\n try {\n const result = yield* awaited(\n moduleNormalizer(baseModuleName, moduleNameRequest, context)\n )\n\n if (typeof result === \"object\" && \"error\" in result && result.error) {\n debugLog(\"cToHostNormalizeModule: normalizer returned error\", result.error)\n throw result.error\n }\n\n const name = typeof result === \"string\" ? result : result.value\n return context.getMemory(this.rt.value).newHeapCharPointer(name).value\n } catch (error) {\n debugLog(\"normalizeModule: caught error\", error)\n context.throw(error as any)\n return 0 as BorrowedHeapCharPointer\n }\n }\n ),\n }\n}\n"]}
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