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jerryscript/jerry-core/ecma/operations/ecma-promise-object.c
Zoltan Herczeg 1105b43c22
Optimize Promise data structures. (#3768) 
This patch reworks several structures:

- Fulfill and reject reactions are combined into one collection. The values in this collection
are compressed: a capability followed by an optional fulfill and reject functions.
- Fulfill and reject reactions are directly stored, no need to allocate an object for them.
- The job queue directly stores its items, this saves a pointer to the value, and the
callback is replaced by an uint8 type.
- Promise status and already resolved is stored in extra_info.

JerryScript-DCO-1.0-Signed-off-by: Zoltan Herczeg zherczeg.u-szeged@partner.samsung.com
2020-05-25 18:00:43 +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"
#if ENABLED (JERRY_ES2015_BUILTIN_PROMISE)
/** \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
*/
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
*/
uint16_t
ecma_promise_get_flags (ecma_object_t *obj_p) /**< points to promise object */
{
JERRY_ASSERT (ecma_is_promise (obj_p));
return ((ecma_extended_object_t *) obj_p)->u.class_prop.extra_info;
} /* ecma_promise_get_flags */
/**
* 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 */
bool is_fulfilled) /**< new flags */
{
JERRY_ASSERT (ecma_is_promise (obj_p));
JERRY_ASSERT (ecma_promise_get_flags (obj_p) & ECMA_PROMISE_IS_PENDING);
uint16_t flags_to_invert = (is_fulfilled ? (ECMA_PROMISE_IS_PENDING | ECMA_PROMISE_IS_FULFILLED)
: ECMA_PROMISE_IS_PENDING);
((ecma_extended_object_t *) obj_p)->u.class_prop.extra_info ^= flags_to_invert;
} /* ecma_promise_set_state */
/**
* 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_t *reactions, /**< lists of reactions */
ecma_value_t value, /**< value for resolve or reject */
bool is_reject) /**< true if promise is rejected, false otherwise */
{
ecma_value_t *buffer_p = reactions->buffer_p;
ecma_value_t *buffer_end_p = buffer_p + reactions->item_count;
while (buffer_p < buffer_end_p)
{
ecma_value_t capability_with_tag = *buffer_p++;
ecma_object_t *capability_obj_p = ECMA_GET_NON_NULL_POINTER_FROM_POINTER_TAG (ecma_object_t, capability_with_tag);
ecma_value_t capability = ecma_make_object_value (capability_obj_p);
if (!is_reject)
{
ecma_value_t handler = ECMA_VALUE_TRUE;
if (JMEM_CP_GET_FIRST_BIT_FROM_POINTER_TAG (capability_with_tag))
{
handler = *buffer_p++;
}
ecma_enqueue_promise_reaction_job (capability, handler, value);
}
else if (JMEM_CP_GET_FIRST_BIT_FROM_POINTER_TAG (capability_with_tag))
{
buffer_p++;
}
if (is_reject)
{
ecma_value_t handler = ECMA_VALUE_FALSE;
if (JMEM_CP_GET_SECOND_BIT_FROM_POINTER_TAG (capability_with_tag))
{
handler = *buffer_p++;
}
ecma_enqueue_promise_reaction_job (capability, handler, value);
}
else if (JMEM_CP_GET_SECOND_BIT_FROM_POINTER_TAG (capability_with_tag))
{
buffer_p++;
}
}
} /* 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_flags (obj_p) & ECMA_PROMISE_IS_PENDING);
ecma_promise_set_state (obj_p, false);
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_collection so freeing the collection
first and creating a new one might cause a heap after use event. */
ecma_collection_t *reactions = promise_p->reactions;
/* Fulfill reactions will never be triggered. */
ecma_promise_trigger_reactions (reactions, reason, true);
promise_p->reactions = ecma_new_collection ();
ecma_collection_destroy (reactions);
} /* 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_flags (obj_p) & ECMA_PROMISE_IS_PENDING);
ecma_promise_set_state (obj_p, true);
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_collection so freeing the collection
first and creating a new one might cause a heap after use event. */
ecma_collection_t *reactions = promise_p->reactions;
/* Reject reactions will never be triggered. */
ecma_promise_trigger_reactions (reactions, value, false);
promise_p->reactions = ecma_new_collection ();
ecma_collection_destroy (reactions);
} /* 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_object_t *function_p = ecma_get_object_from_value (function);
/* 2. */
ecma_value_t promise = ecma_op_object_get_by_magic_id (function_p, LIT_INTERNAL_MAGIC_STRING_PROMISE);
/* 1. */
ecma_object_t *promise_obj_p = ecma_get_object_from_value (promise);
JERRY_ASSERT (ecma_is_promise (promise_obj_p));
/* 3., 4. */
if (ecma_promise_get_flags (promise_obj_p) & ECMA_PROMISE_ALREADY_RESOLVED)
{
ecma_free_value (promise);
return ECMA_VALUE_UNDEFINED;
}
/* 5. */
((ecma_extended_object_t *) promise_obj_p)->u.class_prop.extra_info |= ECMA_PROMISE_ALREADY_RESOLVED;
/* 6. */
ecma_value_t reject_value = (argc == 0) ? ECMA_VALUE_UNDEFINED : argv[0];
ecma_reject_promise (promise, reject_value);
ecma_free_value (promise);
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_object_t *function_p = ecma_get_object_from_value (function);
/* 2. */
ecma_value_t promise = ecma_op_object_get_by_magic_id (function_p, LIT_INTERNAL_MAGIC_STRING_PROMISE);
/* 1. */
ecma_object_t *promise_obj_p = ecma_get_object_from_value (promise);
JERRY_ASSERT (ecma_is_promise (promise_obj_p));
/* 3., 4. */
if (ecma_promise_get_flags (promise_obj_p) & ECMA_PROMISE_ALREADY_RESOLVED)
{
goto end_of_resolve_function;
}
/* 5. */
((ecma_extended_object_t *) promise_obj_p)->u.class_prop.extra_info |= ECMA_PROMISE_ALREADY_RESOLVED;
/* 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 = jcontext_take_exception ();
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);
return ECMA_VALUE_UNDEFINED;
} /* ecma_promise_resolve_handler */
/**
* CapabilitiesExecutor 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 */
/**
* Helper function for PromiseCreateResovingFucntions.
*
* See also: ES2015 25.4.1.3 2. - 7.
*
* @return pointer to the resolving function
*/
static ecma_value_t
ecma_promise_create_resolving_functions_helper (ecma_object_t *obj_p, /**< Promise Object */
ecma_external_handler_t handler_cb) /**< Callback handler */
{
ecma_string_t *str_promise_p = ecma_get_magic_string (LIT_INTERNAL_MAGIC_STRING_PROMISE);
ecma_object_t *func_obj_p = ecma_op_create_external_function_object (handler_cb);
ecma_op_object_put (func_obj_p,
str_promise_p,
ecma_make_object_value (obj_p),
false);
return ecma_make_object_value (func_obj_p);
} /* ecma_promise_create_resolving_functions_helper */
/**
* Create a PromiseCreateResovingFucntions.
*
* See also: ES2015 25.4.1.3
*
* @return pointer to the resolving functions
*/
void
ecma_promise_create_resolving_functions (ecma_object_t *object_p, /**< the promise object */
ecma_promise_resolving_functions_t *funcs) /**< [out] resolving functions */
{
/* 2. - 4. */
funcs->resolve = ecma_promise_create_resolving_functions_helper (object_p,
ecma_promise_resolve_handler);
/* 5. - 7. */
funcs->reject = ecma_promise_create_resolving_functions_helper (object_p,
ecma_promise_reject_handler);
} /* 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);
} /* 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 */
{
JERRY_ASSERT (JERRY_CONTEXT (current_new_target) != NULL);
/* 3. */
ecma_object_t *proto_p = ecma_op_get_prototype_from_constructor (JERRY_CONTEXT (current_new_target),
ECMA_BUILTIN_ID_PROMISE_PROTOTYPE);
if (JERRY_UNLIKELY (proto_p == NULL))
{
return ECMA_VALUE_ERROR;
}
/* Calling ecma_new_collection might trigger a GC call, so this
* allocation is performed before the object is constructed. */
ecma_collection_t *reactions = ecma_new_collection ();
ecma_object_t *object_p = ecma_create_object (proto_p,
sizeof (ecma_promise_object_t),
ECMA_OBJECT_TYPE_CLASS);
ecma_deref_object (proto_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;
/* 5 */
ext_object_p->u.class_prop.extra_info = ECMA_PROMISE_IS_PENDING;
ext_object_p->u.class_prop.u.value = ECMA_VALUE_UNDEFINED;
ecma_promise_object_t *promise_object_p = (ecma_promise_object_t *) object_p;
/* 6-7. */
promise_object_p->reactions = reactions;
/* 8. */
ecma_promise_resolving_functions_t funcs;
ecma_promise_create_resolving_functions (object_p, &funcs);
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 = jcontext_take_exception ();
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 */
/**
* 25.4.1.5.1 GetCapabilitiesExecutor Functions
*
* Checks and sets a promiseCapability's resolve and reject properties.
*
* @return ECMA_VALUE_UNDEFINED or TypeError
* returned value must be freed with ecma_free_value
*/
static ecma_value_t
ecma_op_get_capabilities_executor_cb (const ecma_value_t function_obj, /**< the function itself */
const ecma_value_t this_val, /**< this_arg of the function */
const ecma_value_t args_p[], /**< argument list */
const ecma_length_t args_count) /**< argument number */
{
JERRY_UNUSED (this_val);
/* 1. */
ecma_value_t capability = ecma_op_object_get_by_magic_id (ecma_get_object_from_value (function_obj),
LIT_INTERNAL_MAGIC_STRING_PROMISE_PROPERTY_CAPABILITY);
JERRY_ASSERT (ecma_is_value_object (capability));
/* 2. */
ecma_object_t *capability_obj_p = ecma_get_object_from_value (capability);
/* 3. */
ecma_value_t resolve = ecma_op_object_get_by_magic_id (capability_obj_p,
LIT_INTERNAL_MAGIC_STRING_PROMISE_PROPERTY_RESOLVE);
if (!ecma_is_value_undefined (resolve))
{
ecma_free_value (resolve);
ecma_deref_object (capability_obj_p);
return ecma_raise_type_error (ECMA_ERR_MSG ("Resolve must be undefined"));
}
/* 4. */
ecma_value_t reject = ecma_op_object_get_by_magic_id (capability_obj_p,
LIT_INTERNAL_MAGIC_STRING_PROMISE_PROPERTY_REJECT);
if (!ecma_is_value_undefined (reject))
{
ecma_free_value (reject);
ecma_deref_object (capability_obj_p);
return ecma_raise_type_error (ECMA_ERR_MSG ("Reject must be undefined"));
}
/* 5. */
ecma_op_object_put (capability_obj_p,
ecma_get_magic_string (LIT_INTERNAL_MAGIC_STRING_PROMISE_PROPERTY_RESOLVE),
args_count > 0 ? args_p[0] : ECMA_VALUE_UNDEFINED,
false);
/* 6. */
ecma_op_object_put (capability_obj_p,
ecma_get_magic_string (LIT_INTERNAL_MAGIC_STRING_PROMISE_PROPERTY_REJECT),
args_count > 1 ? args_p[1] : ECMA_VALUE_UNDEFINED,
false);
ecma_deref_object (capability_obj_p);
/* 7. */
return ECMA_VALUE_UNDEFINED;
} /* ecma_op_get_capabilities_executor_cb */
/**
* 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 (ecma_value_t constructor)
{
/* 1. */
if (!ecma_is_constructor (constructor))
{
return ecma_raise_type_error (ECMA_ERR_MSG ("Invalid capability"));
}
ecma_object_t *constructor_obj_p = ecma_get_object_from_value (constructor);
/* 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 = ecma_op_create_external_function_object (ecma_op_get_capabilities_executor_cb);
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_function_construct (constructor_obj_p,
constructor_obj_p,
&executor,
1);
ecma_deref_object (executor_p);
/* 7. */
if (ECMA_IS_VALUE_ERROR (promise))
{
ecma_deref_object (capability_p);
return promise;
}
/* 10. */
ecma_op_object_put (capability_p,
promise_str_p,
promise,
false);
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 */
/**
* The common function for 'reject' and 'resolve'.
*
* @return ecma value
* Returned value must be freed with ecma_free_value.
*/
ecma_value_t
ecma_promise_reject_or_resolve (ecma_value_t this_arg, /**< "this" argument */
ecma_value_t value, /**< rejected or resolved value */
bool is_resolve) /**< the operation is resolve */
{
if (!ecma_is_value_object (this_arg))
{
return ecma_raise_type_error (ECMA_ERR_MSG ("'this' is not an object."));
}
if (is_resolve
&& ecma_is_value_object (value)
&& ecma_is_promise (ecma_get_object_from_value (value)))
{
ecma_object_t *object_p = ecma_get_object_from_value (value);
ecma_value_t constructor = ecma_op_object_get_by_magic_id (object_p, LIT_MAGIC_STRING_CONSTRUCTOR);
if (ECMA_IS_VALUE_ERROR (constructor))
{
return constructor;
}
/* The this_arg must be an object. */
bool is_same_value = (constructor == this_arg);
ecma_free_value (constructor);
if (is_same_value)
{
return ecma_copy_value (value);
}
}
ecma_value_t capability = ecma_promise_new_capability (this_arg);
if (ECMA_IS_VALUE_ERROR (capability))
{
return capability;
}
ecma_string_t *property_str_p;
if (is_resolve)
{
property_str_p = ecma_get_magic_string (LIT_INTERNAL_MAGIC_STRING_PROMISE_PROPERTY_RESOLVE);
}
else
{
property_str_p = ecma_get_magic_string (LIT_INTERNAL_MAGIC_STRING_PROMISE_PROPERTY_REJECT);
}
ecma_value_t func = ecma_op_object_get (ecma_get_object_from_value (capability), property_str_p);
ecma_value_t call_ret = ecma_op_function_call (ecma_get_object_from_value (func),
ECMA_VALUE_UNDEFINED,
&value,
1);
ecma_free_value (func);
if (ECMA_IS_VALUE_ERROR (call_ret))
{
return call_ret;
}
ecma_free_value (call_ret);
ecma_string_t *promise_str_p = ecma_get_magic_string (LIT_INTERNAL_MAGIC_STRING_PROMISE_PROPERTY_PROMISE);
ecma_value_t promise = ecma_op_object_get (ecma_get_object_from_value (capability), promise_str_p);
ecma_free_value (capability);
return promise;
} /* ecma_promise_reject_or_resolve */
/**
* 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 *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_VALUE_TRUE;
}
/* 4. boolean false indicates "thrower" */
if (!ecma_op_is_callable (on_rejected))
{
on_rejected = ECMA_VALUE_FALSE;
}
ecma_object_t *promise_obj_p = ecma_get_object_from_value (promise);
ecma_promise_object_t *promise_p = (ecma_promise_object_t *) promise_obj_p;
uint16_t flags = ecma_promise_get_flags (promise_obj_p);
if (flags & ECMA_PROMISE_IS_PENDING)
{
/* 7. */
ecma_value_t capability_with_tag;
ECMA_SET_NON_NULL_POINTER_TAG (capability_with_tag, ecma_get_object_from_value (result_capability), 0);
if (on_fulfilled != ECMA_VALUE_TRUE)
{
ECMA_SET_FIRST_BIT_TO_POINTER_TAG (capability_with_tag);
}
if (on_rejected != ECMA_VALUE_FALSE)
{
ECMA_SET_SECOND_BIT_TO_POINTER_TAG (capability_with_tag);
}
ecma_collection_push_back (promise_p->reactions, capability_with_tag);
if (on_fulfilled != ECMA_VALUE_TRUE)
{
ecma_collection_push_back (promise_p->reactions, on_fulfilled);
}
if (on_rejected != ECMA_VALUE_FALSE)
{
ecma_collection_push_back (promise_p->reactions, on_rejected);
}
}
else if (flags & ECMA_PROMISE_IS_FULFILLED)
{
/* 8. */
ecma_value_t value = ecma_promise_get_result (promise_obj_p);
ecma_enqueue_promise_reaction_job (result_capability, on_fulfilled, value);
ecma_free_value (value);
}
else
{
/* 9. */
ecma_value_t reason = ecma_promise_get_result (promise_obj_p);
ecma_enqueue_promise_reaction_job (result_capability, on_rejected, reason);
ecma_free_value (reason);
}
/* 10. */
return ecma_op_object_get (ecma_get_object_from_value (result_capability), promise_str_p);
} /* 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 species = ecma_op_species_constructor (obj, ECMA_BUILTIN_ID_PROMISE);
if (ECMA_IS_VALUE_ERROR (species))
{
return species;
}
ecma_value_t result_capability = ecma_promise_new_capability (species);
ecma_free_value (species);
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 /* ENABLED (JERRY_ES2015_BUILTIN_PROMISE) */
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