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jerryscript/jerry-core/ecma/operations/ecma-promise-object.c
Daniel Balla 7717d2ee27 Change Promise properties to internal properties (#2526) 
There was an issue in the Promise implementation where properties were accessible from JavaScript.
ie. `Object.defineProperty(Object.prototype, 0, {})` could modify properties which should've been inaccessible.
The reason behind that is somewhat interesting as 0-7 were the same values as the enum values in the property list of the Promise object.
Changing these properties to internal, makes them inaccessible from JS side.

Also some tests have been changed, namely 2490 and 2465.
The 2490 one got renamed, and all of the testcases from the issue have been added.
2465 got changed as well, since currently our Promise implementation can't display Promise errors, so we should check if an error is correctly returned.

Fixes #2490

Co-authored-by: Robert Fancsik <frobert@inf.u-szeged.hu>
JerryScript-DCO-1.0-Signed-off-by: Daniel Balla dballa@inf.u-szeged.hu
2018-09-24 13:49:41 +02:00

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/* Copyright JS Foundation and other contributors, http://js.foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "ecma-boolean-object.h"
#include "ecma-builtins.h"
#include "ecma-exceptions.h"
#include "ecma-function-object.h"
#include "ecma-gc.h"
#include "ecma-globals.h"
#include "ecma-helpers.h"
#include "ecma-jobqueue.h"
#include "ecma-objects.h"
#include "ecma-objects-general.h"
#include "ecma-promise-object.h"
#include "jcontext.h"
#ifndef CONFIG_DISABLE_ES2015_PROMISE_BUILTIN
/** \addtogroup ecma ECMA
* @{
*
* \addtogroup ecmapromiseobject ECMA Promise object related routines
* @{
*/
/**
* Check if an object is promise.
*
* @return true - if the object is a promise.
* false - otherwise.
*/
inline bool JERRY_ATTR_ALWAYS_INLINE
ecma_is_promise (ecma_object_t *obj_p) /**< points to object */
{
return ecma_object_class_is (obj_p, LIT_MAGIC_STRING_PROMISE_UL);
} /* ecma_is_promise */
/**
* Get the result of the promise.
*
* @return ecma value of the promise result.
* Returned value must be freed with ecma_free_value
*/
static inline ecma_value_t
ecma_promise_get_result (ecma_object_t *obj_p) /**< points to promise object */
{
JERRY_ASSERT (ecma_is_promise (obj_p));
ecma_extended_object_t *ext_object_p = (ecma_extended_object_t *) obj_p;
return ecma_copy_value (ext_object_p->u.class_prop.u.value);
} /* ecma_promise_get_result */
/**
* Set the PromiseResult of promise.
*/
static inline void JERRY_ATTR_ALWAYS_INLINE
ecma_promise_set_result (ecma_object_t *obj_p, /**< points to promise object */
ecma_value_t result) /**< the result value */
{
JERRY_ASSERT (ecma_is_promise (obj_p));
ecma_extended_object_t *ext_object_p = (ecma_extended_object_t *) obj_p;
JERRY_ASSERT (ext_object_p->u.class_prop.u.value == ECMA_VALUE_UNDEFINED);
ext_object_p->u.class_prop.u.value = result;
} /* ecma_promise_set_result */
/**
* Get the PromiseState of promise.
*
* @return the state's enum value
*/
static inline uint8_t JERRY_ATTR_ALWAYS_INLINE
ecma_promise_get_state (ecma_object_t *obj_p) /**< points to promise object */
{
JERRY_ASSERT (ecma_is_promise (obj_p));
return ((ecma_promise_object_t *) obj_p)->state;
} /* ecma_promise_get_state */
/**
* Set the PromiseState of promise.
*/
static inline void JERRY_ATTR_ALWAYS_INLINE
ecma_promise_set_state (ecma_object_t *obj_p, /**< points to promise object */
uint8_t state) /**< the state */
{
JERRY_ASSERT (ecma_is_promise (obj_p));
((ecma_promise_object_t *) obj_p)->state = state;
} /* ecma_promise_set_state */
/**
* Get the bool value of alreadyResolved.
*
* @return bool value of alreadyResolved.
*/
static bool
ecma_get_already_resolved_bool_value (ecma_value_t already_resolved) /**< the alreadyResolved */
{
JERRY_ASSERT (ecma_is_value_object (already_resolved));
ecma_object_t *already_resolved_p = ecma_get_object_from_value (already_resolved);
ecma_extended_object_t *ext_object_p = (ecma_extended_object_t *) already_resolved_p;
JERRY_ASSERT (ext_object_p->u.class_prop.class_id == LIT_MAGIC_STRING_BOOLEAN_UL);
return ext_object_p->u.class_prop.u.value == ecma_make_boolean_value (true);
} /* ecma_get_already_resolved_bool_value */
/**
* Set the value of alreadyResolved.
*/
static void
ecma_set_already_resolved_value (ecma_value_t already_resolved, /**< the alreadyResolved */
bool value) /**< the value to set */
{
JERRY_ASSERT (ecma_is_value_object (already_resolved));
ecma_object_t *already_resolved_p = ecma_get_object_from_value (already_resolved);
ecma_extended_object_t *ext_object_p = (ecma_extended_object_t *) already_resolved_p;
JERRY_ASSERT (ext_object_p->u.class_prop.class_id == LIT_MAGIC_STRING_BOOLEAN_UL);
ext_object_p->u.class_prop.u.value = ecma_make_boolean_value (value);
} /* ecma_set_already_resolved_value */
/**
* Take a collection of Reactions and enqueue a new PromiseReactionJob for each Reaction.
*
* See also: ES2015 25.4.1.8
*/
static void
ecma_promise_trigger_reactions (ecma_collection_header_t *reactions, /**< lists of reactions */
ecma_value_t value) /**< value for resolve or reject */
{
ecma_value_t *ecma_value_p = ecma_collection_iterator_init (reactions);
while (ecma_value_p != NULL)
{
ecma_enqueue_promise_reaction_job (*ecma_value_p, value);
ecma_value_p = ecma_collection_iterator_next (ecma_value_p);
}
ecma_free_values_collection (reactions, ECMA_COLLECTION_NO_REF_OBJECTS);
} /* ecma_promise_trigger_reactions */
/**
* Reject a Promise with a reason.
*
* See also: ES2015 25.4.1.7
*/
static void
ecma_reject_promise (ecma_value_t promise, /**< promise */
ecma_value_t reason) /**< reason for reject */
{
ecma_object_t *obj_p = ecma_get_object_from_value (promise);
JERRY_ASSERT (ecma_promise_get_state (obj_p) == ECMA_PROMISE_STATE_PENDING);
ecma_promise_set_state (obj_p, ECMA_PROMISE_STATE_REJECTED);
ecma_promise_set_result (obj_p, ecma_copy_value_if_not_object (reason));
ecma_promise_object_t *promise_p = (ecma_promise_object_t *) obj_p;
/* GC can be triggered by ecma_new_values_collection so freeing the collection
first and creating a new one might cause a heap after use event. */
ecma_collection_header_t *reject_reactions = promise_p->reject_reactions;
ecma_collection_header_t *fulfill_reactions = promise_p->fulfill_reactions;
promise_p->reject_reactions = ecma_new_values_collection ();
promise_p->fulfill_reactions = ecma_new_values_collection ();
/* Fulfill reactions will never be triggered. */
ecma_free_values_collection (fulfill_reactions, ECMA_COLLECTION_NO_REF_OBJECTS);
ecma_promise_trigger_reactions (reject_reactions, reason);
} /* ecma_reject_promise */
/**
* Fulfill a Promise with a value.
*
* See also: ES2015 25.4.1.4
*/
static void
ecma_fulfill_promise (ecma_value_t promise, /**< promise */
ecma_value_t value) /**< fulfilled value */
{
ecma_object_t *obj_p = ecma_get_object_from_value (promise);
JERRY_ASSERT (ecma_promise_get_state (obj_p) == ECMA_PROMISE_STATE_PENDING);
ecma_promise_set_state (obj_p, ECMA_PROMISE_STATE_FULFILLED);
ecma_promise_set_result (obj_p, ecma_copy_value_if_not_object (value));
ecma_promise_object_t *promise_p = (ecma_promise_object_t *) obj_p;
/* GC can be triggered by ecma_new_values_collection so freeing the collection
first and creating a new one might cause a heap after use event. */
ecma_collection_header_t *reject_reactions = promise_p->reject_reactions;
ecma_collection_header_t *fulfill_reactions = promise_p->fulfill_reactions;
promise_p->reject_reactions = ecma_new_values_collection ();
promise_p->fulfill_reactions = ecma_new_values_collection ();
/* Reject reactions will never be triggered. */
ecma_free_values_collection (reject_reactions, ECMA_COLLECTION_NO_REF_OBJECTS);
ecma_promise_trigger_reactions (fulfill_reactions, value);
} /* ecma_fulfill_promise */
/**
* Native handler for Promise Reject Function.
*
* See also: ES2015 25.4.1.3.1
*
* @return ecma value of undefined.
*/
static ecma_value_t
ecma_promise_reject_handler (const ecma_value_t function, /**< the function itself */
const ecma_value_t this, /**< this_arg of the function */
const ecma_value_t argv[], /**< argument list */
const ecma_length_t argc) /**< argument number */
{
JERRY_UNUSED (this);
ecma_string_t *str_promise_p = ecma_get_magic_string (LIT_INTERNAL_MAGIC_STRING_PROMISE);
ecma_string_t *str_already_resolved_p = ecma_get_magic_string (LIT_INTERNAL_MAGIC_STRING_ALREADY_RESOLVED);
ecma_object_t *function_p = ecma_get_object_from_value (function);
/* 2. */
ecma_value_t promise = ecma_op_object_get (function_p, str_promise_p);
/* 1. */
JERRY_ASSERT (ecma_is_promise (ecma_get_object_from_value (promise)));
/* 3. */
ecma_value_t already_resolved = ecma_op_object_get (function_p, str_already_resolved_p);
/* 4. */
if (ecma_get_already_resolved_bool_value (already_resolved))
{
ecma_free_value (promise);
ecma_free_value (already_resolved);
return ECMA_VALUE_UNDEFINED;
}
/* 5. */
ecma_set_already_resolved_value (already_resolved, true);
/* 6. */
ecma_value_t reject_value = (argc == 0) ? ECMA_VALUE_UNDEFINED : argv[0];
ecma_reject_promise (promise, reject_value);
ecma_free_value (promise);
ecma_free_value (already_resolved);
return ECMA_VALUE_UNDEFINED;
} /* ecma_promise_reject_handler */
/**
* Native handler for Promise Resolve Function.
*
* See also: ES2015 25.4.1.3.2
*
* @return ecma value of undefined.
*/
static ecma_value_t
ecma_promise_resolve_handler (const ecma_value_t function, /**< the function itself */
const ecma_value_t this, /**< this_arg of the function */
const ecma_value_t argv[], /**< argument list */
const ecma_length_t argc) /**< argument number */
{
JERRY_UNUSED (this);
ecma_string_t *str_promise_p = ecma_get_magic_string (LIT_INTERNAL_MAGIC_STRING_PROMISE);
ecma_string_t *str_already_resolved_p = ecma_get_magic_string (LIT_INTERNAL_MAGIC_STRING_ALREADY_RESOLVED);
ecma_object_t *function_p = ecma_get_object_from_value (function);
/* 2. */
ecma_value_t promise = ecma_op_object_get (function_p, str_promise_p);
/* 1. */
JERRY_ASSERT (ecma_is_promise (ecma_get_object_from_value (promise)));
/* 3. */
ecma_value_t already_resolved = ecma_op_object_get (function_p, str_already_resolved_p);
/* 4. */
if (ecma_get_already_resolved_bool_value (already_resolved))
{
goto end_of_resolve_function;
}
/* 5. */
ecma_set_already_resolved_value (already_resolved, true);
/* If the argc is 0, then fulfill the `undefined`. */
if (argc == 0)
{
ecma_fulfill_promise (promise, ECMA_VALUE_UNDEFINED);
goto end_of_resolve_function;
}
/* 6. */
if (argv[0] == promise)
{
ecma_object_t *error_p = ecma_new_standard_error (ECMA_ERROR_TYPE);
ecma_reject_promise (promise, ecma_make_object_value (error_p));
ecma_deref_object (error_p);
goto end_of_resolve_function;
}
/* 7. */
if (!ecma_is_value_object (argv[0]))
{
ecma_fulfill_promise (promise, argv[0]);
goto end_of_resolve_function;
}
/* 8. */
ecma_value_t then = ecma_op_object_get_by_magic_id (ecma_get_object_from_value (argv[0]),
LIT_MAGIC_STRING_THEN);
if (ECMA_IS_VALUE_ERROR (then))
{
/* 9. */
then = JERRY_CONTEXT (error_value);
ecma_reject_promise (promise, then);
}
else if (!ecma_op_is_callable (then))
{
/* 11 .*/
ecma_fulfill_promise (promise, argv[0]);
}
else
{
/* 12 */
ecma_enqueue_promise_resolve_thenable_job (promise, argv[0], then);
}
ecma_free_value (then);
end_of_resolve_function:
ecma_free_value (promise);
ecma_free_value (already_resolved);
return ECMA_VALUE_UNDEFINED;
} /* ecma_promise_resolve_handler */
/**
* CapabilityiesExecutor Function.
*
* See also: ES2015 25.4.1.5.1
*
* @return ecma value of undefined or typerror.
* Returned value must be freed with ecma_free_value
*/
static ecma_value_t
ecma_call_builtin_executor (ecma_object_t *executor_p, /**< the executor object */
ecma_value_t resolve_func, /**< the resolve function */
ecma_value_t reject_func) /**< the reject function */
{
ecma_string_t *capability_str_p = ecma_get_magic_string (LIT_INTERNAL_MAGIC_STRING_PROMISE_PROPERTY_CAPABILITY);
ecma_string_t *resolve_str_p = ecma_get_magic_string (LIT_INTERNAL_MAGIC_STRING_PROMISE_PROPERTY_RESOLVE);
ecma_string_t *reject_str_p = ecma_get_magic_string (LIT_INTERNAL_MAGIC_STRING_PROMISE_PROPERTY_REJECT);
/* 2. */
ecma_value_t capability = ecma_op_object_get (executor_p, capability_str_p);
/* 3. */
ecma_value_t resolve = ecma_op_object_get (ecma_get_object_from_value (capability), resolve_str_p);
if (resolve != ECMA_VALUE_UNDEFINED)
{
ecma_free_value (resolve);
ecma_free_value (capability);
return ecma_raise_type_error (ECMA_ERR_MSG ("'resolve' function should be undefined."));
}
/* 4. */
ecma_value_t reject = ecma_op_object_get (ecma_get_object_from_value (capability), reject_str_p);
if (reject != ECMA_VALUE_UNDEFINED)
{
ecma_free_value (reject);
ecma_free_value (capability);
return ecma_raise_type_error (ECMA_ERR_MSG ("'reject' function should be undefined."));
}
/* 5. */
ecma_op_object_put (ecma_get_object_from_value (capability),
resolve_str_p,
resolve_func,
false);
/* 6. */
ecma_op_object_put (ecma_get_object_from_value (capability),
reject_str_p,
reject_func,
false);
ecma_free_value (capability);
return ECMA_VALUE_UNDEFINED;
} /* ecma_call_builtin_executor */
/**
* Create a PromiseCreateResovingFucntions.
*
* See also: ES2015 25.4.1.3
*
* @return pointer to the resolving functions
*/
ecma_promise_resolving_functions_t *
ecma_promise_create_resolving_functions (ecma_object_t *object_p) /**< the promise object */
{
/* 1. */
ecma_value_t already_resolved = ecma_op_create_boolean_object (ecma_make_boolean_value (false));
ecma_string_t *str_promise_p = ecma_get_magic_string (LIT_INTERNAL_MAGIC_STRING_PROMISE);
ecma_string_t *str_already_resolved_p = ecma_get_magic_string (LIT_INTERNAL_MAGIC_STRING_ALREADY_RESOLVED);
/* 2. */
ecma_object_t *resolve_p;
resolve_p = ecma_op_create_external_function_object (ecma_promise_resolve_handler);
/* 3. */
ecma_op_object_put (resolve_p,
str_promise_p,
ecma_make_object_value (object_p),
false);
/* 4. */
ecma_op_object_put (resolve_p,
str_already_resolved_p,
already_resolved,
false);
/* 5. */
ecma_object_t *reject_p;
reject_p = ecma_op_create_external_function_object (ecma_promise_reject_handler);
/* 6. */
ecma_op_object_put (reject_p,
str_promise_p,
ecma_make_object_value (object_p),
false);
/* 7. */
ecma_op_object_put (reject_p,
str_already_resolved_p,
already_resolved,
false);
/* 8. */
ecma_promise_resolving_functions_t *funcs = jmem_heap_alloc_block (sizeof (ecma_promise_resolving_functions_t));
funcs->resolve = ecma_make_object_value (resolve_p);
funcs->reject = ecma_make_object_value (reject_p);
ecma_free_value (already_resolved);
return funcs;
} /* ecma_promise_create_resolving_functions */
/**
* Free the heap and the member of the resolving functions.
*/
void
ecma_promise_free_resolving_functions (ecma_promise_resolving_functions_t *funcs) /**< points to the functions */
{
ecma_free_value (funcs->resolve);
ecma_free_value (funcs->reject);
jmem_heap_free_block (funcs, sizeof (ecma_promise_resolving_functions_t));
} /* ecma_promise_free_resolving_functions */
/**
* Create a promise object.
*
* See also: ES2015 25.4.3.1
*
* @return ecma value of the new promise object
* Returned value must be freed with ecma_free_value
*/
ecma_value_t
ecma_op_create_promise_object (ecma_value_t executor, /**< the executor function or object */
ecma_promise_executor_type_t type) /**< indicates the type of executor */
{
/* 3. */
ecma_object_t *prototype_obj_p = ecma_builtin_get (ECMA_BUILTIN_ID_PROMISE_PROTOTYPE);
ecma_object_t *object_p = ecma_create_object (prototype_obj_p,
sizeof (ecma_promise_object_t),
ECMA_OBJECT_TYPE_CLASS);
ecma_deref_object (prototype_obj_p);
ecma_extended_object_t *ext_object_p = (ecma_extended_object_t *) object_p;
ext_object_p->u.class_prop.class_id = LIT_MAGIC_STRING_PROMISE_UL;
ext_object_p->u.class_prop.u.value = ECMA_VALUE_UNDEFINED;
ecma_promise_object_t *promise_object_p = (ecma_promise_object_t *) object_p;
promise_object_p->fulfill_reactions = NULL;
promise_object_p->reject_reactions = NULL;
/* 5 */
ecma_promise_set_state (object_p, ECMA_PROMISE_STATE_PENDING);
/* 6-7. */
promise_object_p->fulfill_reactions = ecma_new_values_collection ();
promise_object_p->reject_reactions = ecma_new_values_collection ();
/* 8. */
ecma_promise_resolving_functions_t *funcs = ecma_promise_create_resolving_functions (object_p);
ecma_string_t *str_resolve_p = ecma_get_magic_string (LIT_INTERNAL_MAGIC_STRING_RESOLVE_FUNCTION);
ecma_string_t *str_reject_p = ecma_get_magic_string (LIT_INTERNAL_MAGIC_STRING_REJECT_FUNCTION);
ecma_op_object_put (object_p,
str_resolve_p,
funcs->resolve,
false);
ecma_op_object_put (object_p,
str_reject_p,
funcs->reject,
false);
/* 9. */
ecma_value_t completion = ECMA_VALUE_UNDEFINED;
if (type == ECMA_PROMISE_EXECUTOR_FUNCTION)
{
JERRY_ASSERT (ecma_op_is_callable (executor));
ecma_value_t argv[] = { funcs->resolve, funcs->reject };
completion = ecma_op_function_call (ecma_get_object_from_value (executor),
ECMA_VALUE_UNDEFINED,
argv,
2);
}
else if (type == ECMA_PROMISE_EXECUTOR_OBJECT)
{
JERRY_ASSERT (ecma_is_value_object (executor));
completion = ecma_call_builtin_executor (ecma_get_object_from_value (executor),
funcs->resolve,
funcs->reject);
}
else
{
JERRY_ASSERT (type == ECMA_PROMISE_EXECUTOR_EMPTY);
JERRY_UNUSED (executor);
}
ecma_value_t status = ECMA_VALUE_EMPTY;
if (ECMA_IS_VALUE_ERROR (completion))
{
/* 10.a. */
completion = JERRY_CONTEXT (error_value);
status = ecma_op_function_call (ecma_get_object_from_value (funcs->reject),
ECMA_VALUE_UNDEFINED,
&completion,
1);
}
ecma_promise_free_resolving_functions (funcs);
ecma_free_value (completion);
/* 10.b. */
if (ECMA_IS_VALUE_ERROR (status))
{
ecma_deref_object (object_p);
return status;
}
/* 11. */
ecma_free_value (status);
return ecma_make_object_value (object_p);
} /* ecma_op_create_promise_object */
/**
* Create a new PromiseCapability.
*
* See also: ES2015 25.4.1.5
*
* @return ecma value of the new PromiseCapability
* Returned value must be freed with ecma_free_value
*/
ecma_value_t
ecma_promise_new_capability (void)
{
/* 3. */
ecma_object_t *capability_p = ecma_op_create_object_object_noarg ();
ecma_string_t *capability_str_p = ecma_get_magic_string (LIT_INTERNAL_MAGIC_STRING_PROMISE_PROPERTY_CAPABILITY);
ecma_string_t *promise_str_p = ecma_get_magic_string (LIT_INTERNAL_MAGIC_STRING_PROMISE_PROPERTY_PROMISE);
/* 4. */
ecma_object_t *executor_p;
executor_p = ecma_op_create_object_object_noarg ();
ecma_value_t executor = ecma_make_object_value (executor_p);
/* 5. */
ecma_op_object_put (executor_p,
capability_str_p,
ecma_make_object_value (capability_p),
false);
/* 6. */
ecma_value_t promise = ecma_op_create_promise_object (executor, ECMA_PROMISE_EXECUTOR_OBJECT);
/* 10. */
ecma_op_object_put (capability_p,
promise_str_p,
promise,
false);
ecma_deref_object (executor_p);
/* 7. */
if (ECMA_IS_VALUE_ERROR (promise))
{
ecma_free_value (promise);
ecma_deref_object (capability_p);
return promise;
}
ecma_free_value (promise);
/* 8. */
ecma_string_t *resolve_str_p = ecma_get_magic_string (LIT_INTERNAL_MAGIC_STRING_PROMISE_PROPERTY_RESOLVE);
ecma_value_t resolve = ecma_op_object_get (capability_p, resolve_str_p);
if (!ecma_op_is_callable (resolve))
{
ecma_free_value (resolve);
ecma_deref_object (capability_p);
return ecma_raise_type_error (ECMA_ERR_MSG ("'resolve' parameter must be callable."));
}
ecma_free_value (resolve);
/* 9. */
ecma_string_t *reject_str_p = ecma_get_magic_string (LIT_INTERNAL_MAGIC_STRING_PROMISE_PROPERTY_REJECT);
ecma_value_t reject = ecma_op_object_get (capability_p, reject_str_p);
if (!ecma_op_is_callable (reject))
{
ecma_free_value (reject);
ecma_deref_object (capability_p);
return ecma_raise_type_error (ECMA_ERR_MSG ("'reject' parameter must be callable."));
}
ecma_free_value (reject);
/* 11. */
return ecma_make_object_value (capability_p);
} /* ecma_promise_new_capability */
/**
* It performs the "then" operation on promiFulfilled
* and onRejected as its settlement actions.
*
* See also: 25.4.5.3.1
*
* @return ecma value of the new promise object
* Returned value must be freed with ecma_free_value
*/
static ecma_value_t
ecma_promise_do_then (ecma_value_t promise, /**< the promise which call 'then' */
ecma_value_t on_fulfilled, /**< on_fulfilled function */
ecma_value_t on_rejected, /**< on_rejected function */
ecma_value_t result_capability) /**< promise capability */
{
ecma_string_t *capability_str_p = ecma_get_magic_string (LIT_INTERNAL_MAGIC_STRING_PROMISE_PROPERTY_CAPABILITY);
ecma_string_t *handler_str_p = ecma_get_magic_string (LIT_INTERNAL_MAGIC_STRING_PROMISE_PROPERTY_HANDLER);
ecma_string_t *promise_str_p = ecma_get_magic_string (LIT_INTERNAL_MAGIC_STRING_PROMISE_PROPERTY_PROMISE);
/* 3. boolean true indicates "indentity" */
if (!ecma_op_is_callable (on_fulfilled))
{
on_fulfilled = ecma_make_boolean_value (true);
}
/* 4. boolean false indicates "thrower" */
if (!ecma_op_is_callable (on_rejected))
{
on_rejected = ecma_make_boolean_value (false);
}
/* 5-6. */
ecma_object_t *fulfill_reaction_p = ecma_op_create_object_object_noarg ();
ecma_object_t *reject_reaction_p = ecma_op_create_object_object_noarg ();
ecma_op_object_put (fulfill_reaction_p,
capability_str_p,
result_capability,
false);
ecma_op_object_put (fulfill_reaction_p,
handler_str_p,
on_fulfilled,
false);
ecma_op_object_put (reject_reaction_p,
capability_str_p,
result_capability,
false);
ecma_op_object_put (reject_reaction_p,
handler_str_p,
on_rejected,
false);
ecma_object_t *obj_p = ecma_get_object_from_value (promise);
ecma_promise_object_t *promise_p = (ecma_promise_object_t *) obj_p;
if (ecma_promise_get_state (obj_p) == ECMA_PROMISE_STATE_PENDING)
{
/* 7. */
ecma_append_to_values_collection (promise_p->fulfill_reactions,
ecma_make_object_value (fulfill_reaction_p),
ECMA_COLLECTION_NO_REF_OBJECTS);
ecma_append_to_values_collection (promise_p->reject_reactions,
ecma_make_object_value (reject_reaction_p),
ECMA_COLLECTION_NO_REF_OBJECTS);
}
else if (ecma_promise_get_state (obj_p) == ECMA_PROMISE_STATE_FULFILLED)
{
/* 8. */
ecma_value_t value = ecma_promise_get_result (obj_p);
ecma_enqueue_promise_reaction_job (ecma_make_object_value (fulfill_reaction_p), value);
ecma_free_value (value);
}
else
{
/* 9. */
ecma_value_t reason = ecma_promise_get_result (obj_p);
ecma_enqueue_promise_reaction_job (ecma_make_object_value (reject_reaction_p), reason);
ecma_free_value (reason);
}
/* 10. */
ecma_value_t ret = ecma_op_object_get (ecma_get_object_from_value (result_capability), promise_str_p);
ecma_deref_object (fulfill_reaction_p);
ecma_deref_object (reject_reaction_p);
return ret;
} /* ecma_promise_do_then */
/**
* The common function for ecma_builtin_promise_prototype_then
* and ecma_builtin_promise_prototype_catch.
*
* @return ecma value of a new promise object.
* Returned value must be freed with ecma_free_value.
*/
ecma_value_t
ecma_promise_then (ecma_value_t promise, /**< the promise which call 'then' */
ecma_value_t on_fulfilled, /**< on_fulfilled function */
ecma_value_t on_rejected) /**< on_rejected function */
{
if (!ecma_is_value_object (promise))
{
return ecma_raise_type_error (ECMA_ERR_MSG ("'this' is not an object."));
}
ecma_object_t *obj = ecma_get_object_from_value (promise);
if (!ecma_is_promise (obj))
{
return ecma_raise_type_error (ECMA_ERR_MSG ("'this' is not a Promise."));
}
ecma_value_t result_capability = ecma_promise_new_capability ();
if (ECMA_IS_VALUE_ERROR (result_capability))
{
return result_capability;
}
ecma_value_t ret = ecma_promise_do_then (promise, on_fulfilled, on_rejected, result_capability);
ecma_free_value (result_capability);
return ret;
} /* ecma_promise_then */
/**
* @}
* @}
*/
#endif /* !CONFIG_DISABLE_ES2015_PROMISE_BUILTIN */
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