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Reduce memory consumption of Promise objects (#4607)

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No need to keep a reference to resolver functions.
Unused resolvers are cleaned up sooner by GC.

JerryScript-DCO-1.0-Signed-off-by: Zoltan Herczeg zherczeg.u-szeged@partner.samsung.com
This commit is contained in:
Zoltan Herczeg
2021-02-24 08:51:23 +01:00
committed by GitHub
parent 1cf2989a64
commit a3bdd36556
5 changed files with 81 additions and 87 deletions
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jerry-core/ecma/operations/ecma-promise-object.c
+66 -50
View File
@@ -309,20 +309,16 @@ ecma_fulfill_promise (ecma_value_t promise, /**< promise */
} /* ecma_fulfill_promise */
/**
* Native handler for Promise Reject Function.
* Reject a Promise with a reason. Sanity checks are performed before the reject.
*
* See also: ES2015 25.4.1.3.1
*
* @return ecma value of undefined.
*/
ecma_value_t
ecma_promise_reject_handler (ecma_object_t *function_obj_p, /**< function object */
const ecma_value_t args_p[], /**< argument list */
const uint32_t args_count) /**< argument number */
ecma_reject_promise_with_checks (ecma_value_t promise, /**< promise */
ecma_value_t reason) /**< reason for reject */
{
ecma_promise_resolver_t *function_p = (ecma_promise_resolver_t *) function_obj_p;
ecma_value_t promise = function_p->promise;
/* 1. */
ecma_object_t *promise_obj_p = ecma_get_object_from_value (promise);
JERRY_ASSERT (ecma_is_promise (promise_obj_p));
@@ -334,28 +330,23 @@ ecma_promise_reject_handler (ecma_object_t *function_obj_p, /**< function object
((ecma_extended_object_t *) promise_obj_p)->u.class_prop.extra_info |= ECMA_PROMISE_ALREADY_RESOLVED;
/* 6. */
ecma_value_t reject_value = (args_count == 0) ? ECMA_VALUE_UNDEFINED : args_p[0];
ecma_reject_promise (promise, reject_value);
ecma_reject_promise (promise, reason);
}
return ECMA_VALUE_UNDEFINED;
} /* ecma_promise_reject_handler */
} /* ecma_reject_promise_with_checks */
/**
* Native handler for Promise Resolve Function.
* Fulfill a Promise with a value. Sanity checks are performed before the resolve.
*
* See also: ES2015 25.4.1.3.2
*
* @return ecma value of undefined.
*/
ecma_value_t
ecma_promise_resolve_handler (ecma_object_t *function_obj_p, /**< function object */
const ecma_value_t args_p[], /**< argument list */
const uint32_t args_count) /**< argument number */
ecma_fulfill_promise_with_checks (ecma_value_t promise, /**< promise */
ecma_value_t value) /**< fulfilled value */
{
ecma_promise_resolver_t *function_p = (ecma_promise_resolver_t *) function_obj_p;
ecma_value_t promise = function_p->promise;
/* 1. */
ecma_object_t *promise_obj_p = ecma_get_object_from_value (promise);
JERRY_ASSERT (ecma_is_promise (promise_obj_p));
@@ -366,10 +357,42 @@ ecma_promise_resolve_handler (ecma_object_t *function_obj_p, /**< function objec
/* 5. */
((ecma_extended_object_t *) promise_obj_p)->u.class_prop.extra_info |= ECMA_PROMISE_ALREADY_RESOLVED;
ecma_fulfill_promise (promise, (args_count == 0) ? ECMA_VALUE_UNDEFINED : args_p[0]);
ecma_fulfill_promise (promise, value);
}
return ECMA_VALUE_UNDEFINED;
} /* ecma_fulfill_promise_with_checks */
/**
* Native handler for Promise Reject Function.
*
* @return ecma value of undefined.
*/
ecma_value_t
ecma_promise_reject_handler (ecma_object_t *function_obj_p, /**< function object */
const ecma_value_t args_p[], /**< argument list */
const uint32_t args_count) /**< argument number */
{
ecma_promise_resolver_t *function_p = (ecma_promise_resolver_t *) function_obj_p;
ecma_value_t reject_value = (args_count == 0) ? ECMA_VALUE_UNDEFINED : args_p[0];
return ecma_reject_promise_with_checks (function_p->promise, reject_value);
} /* ecma_promise_reject_handler */
/**
* Native handler for Promise Resolve Function.
*
* @return ecma value of undefined.
*/
ecma_value_t
ecma_promise_resolve_handler (ecma_object_t *function_obj_p, /**< function object */
const ecma_value_t args_p[], /**< argument list */
const uint32_t args_count) /**< argument number */
{
ecma_promise_resolver_t *function_p = (ecma_promise_resolver_t *) function_obj_p;
ecma_value_t fulfilled_value = (args_count == 0) ? ECMA_VALUE_UNDEFINED : args_p[0];
return ecma_fulfill_promise_with_checks (function_p->promise, fulfilled_value);
} /* ecma_promise_resolve_handler */
/**
@@ -380,8 +403,8 @@ ecma_promise_resolve_handler (ecma_object_t *function_obj_p, /**< function objec
* @return pointer to the resolving function
*/
static ecma_object_t *
ecma_promise_create_resolving_functions_helper (ecma_object_t *promise_p, /**< Promise Object */
ecma_native_handler_id_t id) /**< Callback handler */
ecma_promise_create_resolving_function (ecma_object_t *promise_p, /**< Promise Object */
ecma_native_handler_id_t id) /**< Callback handler */
{
ecma_object_t *func_obj_p = ecma_op_create_native_handler (id, sizeof (ecma_promise_resolver_t));
@@ -389,30 +412,35 @@ ecma_promise_create_resolving_functions_helper (ecma_object_t *promise_p, /**< P
resolver_p->promise = ecma_make_object_value (promise_p);
return func_obj_p;
} /* ecma_promise_create_resolving_functions_helper */
} /* ecma_promise_create_resolving_function */
/**
* Perform PromiseCreateResolvingFunctions.
* Helper function for running an executor.
*
* See also: ES2015 25.4.1.3
*
* @return pointer to the resolving functions
* @return ecma value of the executor callable
* Returned value must be freed with ecma_free_value
*/
void
ecma_promise_create_resolving_functions (ecma_promise_object_t *promise_p) /**< the promise object */
ecma_value_t
ecma_promise_run_executor (ecma_object_t *promise_p, /**< Promise Object */
ecma_value_t executor, /**< executor function */
ecma_value_t this_value) /**< this value */
{
/* 2. - 7. */
ecma_object_t *resolve_func_p = ecma_promise_create_resolving_functions_helper ((ecma_object_t *) promise_p,
ECMA_NATIVE_HANDLER_PROMISE_RESOLVE);
ecma_object_t *reject_func_p = ecma_promise_create_resolving_functions_helper ((ecma_object_t *) promise_p,
ECMA_NATIVE_HANDLER_PROMISE_REJECT);
promise_p->resolve = ecma_make_object_value (resolve_func_p);
promise_p->reject = ecma_make_object_value (reject_func_p);
ecma_object_t *resolve_func_p, *reject_func_p;
resolve_func_p = ecma_promise_create_resolving_function (promise_p,
ECMA_NATIVE_HANDLER_PROMISE_RESOLVE);
reject_func_p = ecma_promise_create_resolving_function (promise_p,
ECMA_NATIVE_HANDLER_PROMISE_REJECT);
ecma_value_t argv[] = { ecma_make_object_value (resolve_func_p), ecma_make_object_value (reject_func_p) };
ecma_value_t result = ecma_op_function_call (ecma_get_object_from_value (executor),
this_value,
argv,
2);
ecma_deref_object (resolve_func_p);
ecma_deref_object (reject_func_p);
} /* ecma_promise_create_resolving_functions */
return result;
} /* ecma_promise_run_executor */
/**
* Create a promise object.
@@ -460,11 +488,6 @@ ecma_op_create_promise_object (ecma_value_t executor, /**< the executor function
/* 6-8. */
ecma_promise_object_t *promise_object_p = (ecma_promise_object_t *) object_p;
promise_object_p->reactions = reactions;
/* Creating the resolving function may trigger a GC, so these need to be initialized. */
promise_object_p->resolve = ECMA_VALUE_EMPTY;
promise_object_p->reject = ECMA_VALUE_EMPTY;
ecma_promise_create_resolving_functions (promise_object_p);
#if JERRY_PROMISE_CALLBACK
if (JERRY_UNLIKELY (JERRY_CONTEXT (promise_callback) != NULL))
@@ -483,11 +506,7 @@ ecma_op_create_promise_object (ecma_value_t executor, /**< the executor function
{
JERRY_ASSERT (ecma_op_is_callable (executor));
ecma_value_t argv[] = { promise_object_p->resolve, promise_object_p->reject };
completion = ecma_op_function_call (ecma_get_object_from_value (executor),
ECMA_VALUE_UNDEFINED,
argv,
2);
completion = ecma_promise_run_executor (object_p, executor, ECMA_VALUE_UNDEFINED);
}
ecma_value_t status = ECMA_VALUE_EMPTY;
@@ -496,10 +515,7 @@ ecma_op_create_promise_object (ecma_value_t executor, /**< the executor function
{
/* 10.a. */
completion = jcontext_take_exception ();
status = ecma_op_function_call (ecma_get_object_from_value (promise_object_p->reject),
ECMA_VALUE_UNDEFINED,
&completion,
1);
ecma_reject_promise_with_checks (ecma_make_object_value (object_p), completion);
}
ecma_free_value (completion);