async_hooks.c
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async_hooks.c
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	// stub: minimal node:async_hooks implementation
	// just enough for react to render tree

	#include <stdlib.h>

	#include "ant.h"
	#include "internal.h"
	#include "silver/engine.h"

	#include "descriptors.h"
	#include "modules/async_hooks.h"
	#include "modules/symbol.h"

	static inline bool async_hooks_is_callable(jsval_t v) {
	uint8_t t = vtype(v);
	return t == T_FUNC \|\| t == T_CFUNC;
	}

	static jsval_t async_hooks_call_with_tail_args(
	ant_t js, jsval_t fn, jsval_t this_arg, jsval_t args, int nargs, int start_idx
	) {
	int call_nargs = nargs - start_idx;
	if (call_nargs <= 0) return sv_vm_call(js->vm, js, fn, this_arg, NULL, 0, NULL, false);

	jsval_t call_args = (jsval_t )malloc((size_t)call_nargs * sizeof(jsval_t));
	if (!call_args) return js_mkerr(js, "Out of memory");

	for (int i = 0; i < call_nargs; i++) call_args[i] = args[start_idx + i];
	jsval_t result = sv_vm_call(js->vm, js, fn, this_arg, call_args, call_nargs, NULL, false);
	free(call_args);
	return result;
	}

	static jsval_t async_local_storage_run(ant_t js, jsval_t args, int nargs) {
	if (nargs < 2 \|\| !async_hooks_is_callable(args[1])) {
	return js_mkerr(js, "AsyncLocalStorage.run(store, callback, ...args) requires a callback");
	}

	jsval_t this_obj = js_getthis(js);
	if (!is_object_type(this_obj)) {
	return js_mkerr(js, "AsyncLocalStorage.run() requires an AsyncLocalStorage instance");
	}

	jsval_t prev = js_get_slot(js, this_obj, SLOT_DATA);
	js_set_slot(js, this_obj, SLOT_DATA, args[0]);
	jsval_t result = async_hooks_call_with_tail_args(js, args[1], js_mkundef(), args, nargs, 2);
	js_set_slot(js, this_obj, SLOT_DATA, prev);
	return result;
	}

	static jsval_t async_local_storage_exit(ant_t js, jsval_t args, int nargs) {
	if (nargs < 1 \|\| !async_hooks_is_callable(args[0])) {
	return js_mkerr(js, "AsyncLocalStorage.exit(callback, ...args) requires a callback");
	}

	jsval_t this_obj = js_getthis(js);
	if (!is_object_type(this_obj)) {
	return js_mkerr(js, "AsyncLocalStorage.exit() requires an AsyncLocalStorage instance");
	}

	jsval_t prev = js_get_slot(js, this_obj, SLOT_DATA);
	js_set_slot(js, this_obj, SLOT_DATA, js_mkundef());
	jsval_t result = async_hooks_call_with_tail_args(js, args[0], js_mkundef(), args, nargs, 1);
	js_set_slot(js, this_obj, SLOT_DATA, prev);
	return result;
	}

	static jsval_t async_local_storage_enterWith(ant_t js, jsval_t args, int nargs) {
	jsval_t this_obj = js_getthis(js);
	if (!is_object_type(this_obj)) {
	return js_mkerr(js, "AsyncLocalStorage.enterWith() requires an AsyncLocalStorage instance");
	}
	js_set_slot(js, this_obj, SLOT_DATA, nargs > 0 ? args[0] : js_mkundef());
	return js_mkundef();
	}

	static jsval_t async_local_storage_getStore(ant_t js, jsval_t args, int nargs) {
	(void)args; (void)nargs;
	jsval_t this_obj = js_getthis(js);
	if (!is_object_type(this_obj)) return js_mkundef();
	return js_get_slot(js, this_obj, SLOT_DATA);
	}

	static jsval_t async_local_storage_disable(ant_t js, jsval_t args, int nargs) {
	(void)args; (void)nargs;
	jsval_t this_obj = js_getthis(js);
	if (is_object_type(this_obj)) js_set_slot(js, this_obj, SLOT_DATA, js_mkundef());
	return js_mkundef();
	}

	static jsval_t async_resource_runInAsyncScope(ant_t js, jsval_t args, int nargs) {
	if (nargs < 1 \|\| !async_hooks_is_callable(args[0])) {
	return js_mkerr(js, "AsyncResource.runInAsyncScope(fn[, thisArg, ...args]) requires a function");
	}
	jsval_t this_arg = nargs > 1 ? args[1] : js_mkundef();
	return async_hooks_call_with_tail_args(js, args[0], this_arg, args, nargs, 2);
	}

	static jsval_t async_resource_emitDestroy(ant_t js, jsval_t args, int nargs) {
	(void)args; (void)nargs;
	return js_getthis(js);
	}

	static jsval_t async_resource_asyncId(ant_t js, jsval_t args, int nargs) {
	(void)js; (void)args; (void)nargs;
	return js_mknum(0);
	}

	static jsval_t async_resource_triggerAsyncId(ant_t js, jsval_t args, int nargs) {
	(void)js; (void)args; (void)nargs;
	return js_mknum(0);
	}

	static jsval_t async_hook_enable(ant_t js, jsval_t args, int nargs) {
	(void)args; (void)nargs;
	return js_getthis(js);
	}

	static jsval_t async_hook_disable(ant_t js, jsval_t args, int nargs) {
	(void)args; (void)nargs;
	return js_getthis(js);
	}

	static jsval_t async_hooks_createHook(ant_t js, jsval_t args, int nargs) {
	(void)args; (void)nargs;
	jsval_t hook = js_mkobj(js);
	js_set(js, hook, "enable", js_mkfun(async_hook_enable));
	js_set(js, hook, "disable", js_mkfun(async_hook_disable));
	return hook;
	}

	static jsval_t async_hooks_executionAsyncId(ant_t js, jsval_t args, int nargs) {
	(void)js; (void)args; (void)nargs;
	return js_mknum(1);
	}

	static jsval_t async_hooks_triggerAsyncId(ant_t js, jsval_t args, int nargs) {
	(void)js; (void)args; (void)nargs;
	return js_mknum(0);
	}

	static jsval_t async_hooks_executionAsyncResource(ant_t js, jsval_t args, int nargs) {
	(void)args; (void)nargs;
	return js_mkobj(js);
	}

	jsval_t async_hooks_library(ant_t *js) {
	jsval_t lib = js_mkobj(js);

	jsval_t als_ctor = js_mkobj(js);
	jsval_t als_proto = js_mkobj(js);
	js_set(js, als_proto, "run", js_mkfun(async_local_storage_run));
	js_set(js, als_proto, "exit", js_mkfun(async_local_storage_exit));
	js_set(js, als_proto, "enterWith", js_mkfun(async_local_storage_enterWith));
	js_set(js, als_proto, "getStore", js_mkfun(async_local_storage_getStore));
	js_set(js, als_proto, "disable", js_mkfun(async_local_storage_disable));
	js_set_sym(js, als_proto, get_toStringTag_sym(), ANT_STRING("AsyncLocalStorage"));
	js_set_slot(js, als_ctor, SLOT_DEFAULT_CTOR, js_true);
	js_mkprop_fast(js, als_ctor, "prototype", 9, als_proto);
	js_mkprop_fast(js, als_ctor, "name", 4, ANT_STRING("AsyncLocalStorage"));
	js_set_descriptor(js, als_ctor, "name", 4, 0);
	js_set(js, lib, "AsyncLocalStorage", js_obj_to_func(als_ctor));

	jsval_t resource_ctor = js_mkobj(js);
	jsval_t resource_proto = js_mkobj(js);
	js_set(js, resource_proto, "runInAsyncScope", js_mkfun(async_resource_runInAsyncScope));
	js_set(js, resource_proto, "emitDestroy", js_mkfun(async_resource_emitDestroy));
	js_set(js, resource_proto, "asyncId", js_mkfun(async_resource_asyncId));
	js_set(js, resource_proto, "triggerAsyncId", js_mkfun(async_resource_triggerAsyncId));
	js_set_sym(js, resource_proto, get_toStringTag_sym(), ANT_STRING("AsyncResource"));
	js_set_slot(js, resource_ctor, SLOT_DEFAULT_CTOR, js_true);
	js_mkprop_fast(js, resource_ctor, "prototype", 9, resource_proto);
	js_mkprop_fast(js, resource_ctor, "name", 4, ANT_STRING("AsyncResource"));
	js_set_descriptor(js, resource_ctor, "name", 4, 0);
	js_set(js, lib, "AsyncResource", js_obj_to_func(resource_ctor));

	js_set(js, lib, "createHook", js_mkfun(async_hooks_createHook));
	js_set(js, lib, "executionAsyncId", js_mkfun(async_hooks_executionAsyncId));
	js_set(js, lib, "triggerAsyncId", js_mkfun(async_hooks_triggerAsyncId));
	js_set(js, lib, "executionAsyncResource", js_mkfun(async_hooks_executionAsyncResource));
	js_set(js, lib, "asyncWrapProviders", js_mkobj(js));
	js_set_sym(js, lib, get_toStringTag_sym(), ANT_STRING("async_hooks"));

	return lib;
	}

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