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jerryscript/jerry-core/ecma/base/ecma-gc.c
Robert Fancsik 48f34adea5 General GC optimizations (#3221) 
- Enable recursive GC marking with a limited recursion count (this option is configurable)
- No need to decrease the reference count of the gray objects anymore
- Bound function object marking is seperated into a helper function

JerryScript-DCO-1.0-Signed-off-by: Robert Fancsik frobert@inf.u-szeged.hu
2019-10-24 14:49:47 +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.
*/
/**
* Garbage collector implementation
*/
#include "ecma-alloc.h"
#include "ecma-container-object.h"
#include "ecma-globals.h"
#include "ecma-gc.h"
#include "ecma-helpers.h"
#include "ecma-property-hashmap.h"
#include "jcontext.h"
#include "jrt.h"
#include "jrt-libc-includes.h"
#include "jrt-bit-fields.h"
#include "re-compiler.h"
#include "vm-defines.h"
#include "vm-stack.h"
#if ENABLED (JERRY_ES2015_BUILTIN_TYPEDARRAY)
#include "ecma-typedarray-object.h"
#endif /* ENABLED (JERRY_ES2015_BUILTIN_TYPEDARRAY) */
#if ENABLED (JERRY_ES2015_BUILTIN_PROMISE)
#include "ecma-promise-object.h"
#endif /* ENABLED (JERRY_ES2015_BUILTIN_PROMISE) */
/* TODO: Extract GC to a separate component */
/** \addtogroup ecma ECMA
* @{
*
* \addtogroup ecmagc Garbage collector
* @{
*/
/*
* The garbage collector uses the reference counter
* of object: it increases the counter by one when
* the object is marked at the first time.
*/
/**
* Get visited flag of the object.
*
* @return true - if visited
* false - otherwise
*/
static inline bool JERRY_ATTR_ALWAYS_INLINE
ecma_gc_is_object_visited (ecma_object_t *object_p) /**< object */
{
JERRY_ASSERT (object_p != NULL);
return (object_p->type_flags_refs < ECMA_OBJECT_NON_VISITED);
} /* ecma_gc_is_object_visited */
/**
* Mark objects as visited starting from specified object as root
*/
static void ecma_gc_mark (ecma_object_t *object_p);
/**
* Set visited flag of the object.
*/
static void
ecma_gc_set_object_visited (ecma_object_t *object_p) /**< object */
{
if (object_p->type_flags_refs >= ECMA_OBJECT_NON_VISITED)
{
#if (JERRY_GC_MARK_LIMIT != 0)
if (JERRY_CONTEXT (ecma_gc_mark_recursion_limit) != 0)
{
JERRY_CONTEXT (ecma_gc_mark_recursion_limit)--;
/* Set the reference count of gray object to 0 */
object_p->type_flags_refs = (uint16_t) (object_p->type_flags_refs & (ECMA_OBJECT_REF_ONE - 1));
ecma_gc_mark (object_p);
JERRY_CONTEXT (ecma_gc_mark_recursion_limit)++;
}
else
{
/* Set the reference count of the non-marked gray object to 1 */
object_p->type_flags_refs = (uint16_t) (object_p->type_flags_refs & ((ECMA_OBJECT_REF_ONE << 1) - 1));
JERRY_ASSERT (object_p->type_flags_refs >= ECMA_OBJECT_REF_ONE);
}
#else /* (JERRY_GC_MARK_LIMIT == 0) */
/* Set the reference count of gray object to 0 */
object_p->type_flags_refs = (uint16_t) (object_p->type_flags_refs & (ECMA_OBJECT_REF_ONE - 1));
#endif /* (JERRY_GC_MARK_LIMIT != 0) */
}
} /* ecma_gc_set_object_visited */
/**
* Initialize GC information for the object
*/
inline void
ecma_init_gc_info (ecma_object_t *object_p) /**< object */
{
JERRY_CONTEXT (ecma_gc_objects_number)++;
JERRY_CONTEXT (ecma_gc_new_objects)++;
JERRY_ASSERT (JERRY_CONTEXT (ecma_gc_new_objects) <= JERRY_CONTEXT (ecma_gc_objects_number));
JERRY_ASSERT (object_p->type_flags_refs < ECMA_OBJECT_REF_ONE);
object_p->type_flags_refs = (uint16_t) (object_p->type_flags_refs | ECMA_OBJECT_REF_ONE);
object_p->gc_next_cp = JERRY_CONTEXT (ecma_gc_objects_cp);
ECMA_SET_NON_NULL_POINTER (JERRY_CONTEXT (ecma_gc_objects_cp), object_p);
} /* ecma_init_gc_info */
/**
* Increase reference counter of an object
*/
void
ecma_ref_object (ecma_object_t *object_p) /**< object */
{
if (JERRY_LIKELY (object_p->type_flags_refs < ECMA_OBJECT_MAX_REF))
{
object_p->type_flags_refs = (uint16_t) (object_p->type_flags_refs + ECMA_OBJECT_REF_ONE);
}
else
{
jerry_fatal (ERR_REF_COUNT_LIMIT);
}
} /* ecma_ref_object */
/**
* Decrease reference counter of an object
*/
inline void JERRY_ATTR_ALWAYS_INLINE
ecma_deref_object (ecma_object_t *object_p) /**< object */
{
JERRY_ASSERT (object_p->type_flags_refs >= ECMA_OBJECT_REF_ONE);
object_p->type_flags_refs = (uint16_t) (object_p->type_flags_refs - ECMA_OBJECT_REF_ONE);
} /* ecma_deref_object */
/**
* Mark referenced object from property
*/
static inline void JERRY_ATTR_ALWAYS_INLINE
ecma_gc_mark_properties (ecma_property_pair_t *property_pair_p) /**< property pair */
{
for (uint32_t index = 0; index < ECMA_PROPERTY_PAIR_ITEM_COUNT; index++)
{
uint8_t property = property_pair_p->header.types[index];
switch (ECMA_PROPERTY_GET_TYPE (property))
{
case ECMA_PROPERTY_TYPE_NAMEDDATA:
{
ecma_value_t value = property_pair_p->values[index].value;
if (ecma_is_value_object (value))
{
ecma_object_t *value_obj_p = ecma_get_object_from_value (value);
ecma_gc_set_object_visited (value_obj_p);
}
break;
}
case ECMA_PROPERTY_TYPE_NAMEDACCESSOR:
{
ecma_property_value_t *accessor_objs_p = property_pair_p->values + index;
ecma_getter_setter_pointers_t *get_set_pair_p = ecma_get_named_accessor_property (accessor_objs_p);
if (get_set_pair_p->getter_cp != JMEM_CP_NULL)
{
ecma_gc_set_object_visited (ECMA_GET_NON_NULL_POINTER (ecma_object_t, get_set_pair_p->getter_cp));
}
if (get_set_pair_p->setter_cp != JMEM_CP_NULL)
{
ecma_gc_set_object_visited (ECMA_GET_NON_NULL_POINTER (ecma_object_t, get_set_pair_p->setter_cp));
}
break;
}
case ECMA_PROPERTY_TYPE_INTERNAL:
{
JERRY_ASSERT (ECMA_PROPERTY_GET_NAME_TYPE (property) == ECMA_DIRECT_STRING_MAGIC
&& property_pair_p->names_cp[index] >= LIT_FIRST_INTERNAL_MAGIC_STRING);
break;
}
default:
{
JERRY_ASSERT (ECMA_PROPERTY_GET_TYPE (property) == ECMA_PROPERTY_TYPE_SPECIAL);
JERRY_ASSERT (property == ECMA_PROPERTY_TYPE_HASHMAP
|| property == ECMA_PROPERTY_TYPE_DELETED);
break;
}
}
}
} /* ecma_gc_mark_properties */
/**
* Mark objects referenced by bound function object.
*/
static void JERRY_ATTR_NOINLINE
ecma_gc_mark_bound_function_object (ecma_object_t *object_p) /**< bound function object */
{
JERRY_ASSERT (ecma_get_object_type (object_p) == ECMA_OBJECT_TYPE_BOUND_FUNCTION);
ecma_extended_object_t *ext_function_p = (ecma_extended_object_t *) object_p;
ecma_object_t *target_func_obj_p;
target_func_obj_p = ECMA_GET_INTERNAL_VALUE_POINTER (ecma_object_t,
ext_function_p->u.bound_function.target_function);
ecma_gc_set_object_visited (target_func_obj_p);
ecma_value_t args_len_or_this = ext_function_p->u.bound_function.args_len_or_this;
if (!ecma_is_value_integer_number (args_len_or_this))
{
if (ecma_is_value_object (args_len_or_this))
{
ecma_gc_set_object_visited (ecma_get_object_from_value (args_len_or_this));
}
return;
}
ecma_integer_value_t args_length = ecma_get_integer_from_value (args_len_or_this);
ecma_value_t *args_p = (ecma_value_t *) (ext_function_p + 1);
JERRY_ASSERT (args_length > 0);
for (ecma_integer_value_t i = 0; i < args_length; i++)
{
if (ecma_is_value_object (args_p[i]))
{
ecma_gc_set_object_visited (ecma_get_object_from_value (args_p[i]));
}
}
} /* ecma_gc_mark_bound_function_object */
#if ENABLED (JERRY_ES2015_BUILTIN_PROMISE)
/**
* Mark objects referenced by Promise built-in.
*/
static void
ecma_gc_mark_promise_object (ecma_extended_object_t *ext_object_p) /**< extended object */
{
/* Mark promise result. */
ecma_value_t result = ext_object_p->u.class_prop.u.value;
if (ecma_is_value_object (result))
{
ecma_gc_set_object_visited (ecma_get_object_from_value (result));
}
/* Mark all reactions. */
ecma_promise_object_t *promise_object_p = (ecma_promise_object_t *) ext_object_p;
ecma_collection_t *collection_p = promise_object_p->fulfill_reactions;
if (collection_p != NULL)
{
ecma_value_t *buffer_p = collection_p->buffer_p;
for (uint32_t i = 0; i < collection_p->item_count; i++)
{
ecma_gc_set_object_visited (ecma_get_object_from_value (buffer_p[i]));
}
}
collection_p = promise_object_p->reject_reactions;
if (collection_p != NULL)
{
ecma_value_t *buffer_p = collection_p->buffer_p;
for (uint32_t i = 0; i < collection_p->item_count; i++)
{
ecma_gc_set_object_visited (ecma_get_object_from_value (buffer_p[i]));
}
}
} /* ecma_gc_mark_promise_object */
#endif /* ENABLED (JERRY_ES2015_BUILTIN_PROMISE) */
#if ENABLED (JERRY_ES2015_BUILTIN_MAP) || ENABLED (JERRY_ES2015_BUILTIN_SET)
/**
* Mark objects referenced by Map/Set built-in.
*/
static void
ecma_gc_mark_container_object (ecma_object_t *object_p) /**< object */
{
ecma_map_object_t *map_object_p = (ecma_map_object_t *) object_p;
ecma_object_t *internal_obj_p = ecma_get_object_from_value (map_object_p->header.u.class_prop.u.value);
ecma_gc_set_object_visited (internal_obj_p);
jmem_cpointer_t prop_iter_cp = internal_obj_p->u1.property_list_cp;
#if ENABLED (JERRY_PROPRETY_HASHMAP)
if (prop_iter_cp != JMEM_CP_NULL)
{
ecma_property_header_t *prop_iter_p = ECMA_GET_NON_NULL_POINTER (ecma_property_header_t,
prop_iter_cp);
if (prop_iter_p->types[0] == ECMA_PROPERTY_TYPE_HASHMAP)
{
prop_iter_cp = prop_iter_p->next_property_cp;
}
}
#endif /* ENABLED (JERRY_PROPRETY_HASHMAP) */
while (prop_iter_cp != JMEM_CP_NULL)
{
ecma_property_header_t *prop_iter_p = ECMA_GET_NON_NULL_POINTER (ecma_property_header_t, prop_iter_cp);
JERRY_ASSERT (ECMA_PROPERTY_IS_PROPERTY_PAIR (prop_iter_p));
ecma_gc_mark_properties ((ecma_property_pair_t *) prop_iter_p);
ecma_property_pair_t *prop_pair_p = (ecma_property_pair_t *) prop_iter_p;
for (uint32_t i = 0; i < ECMA_PROPERTY_PAIR_ITEM_COUNT; i++)
{
ecma_property_t *property_p = (ecma_property_t *) (prop_iter_p->types + i);
if (ECMA_PROPERTY_GET_NAME_TYPE (*property_p) == ECMA_DIRECT_STRING_PTR)
{
jmem_cpointer_t name_cp = prop_pair_p->names_cp[i];
ecma_string_t *prop_name_p = ECMA_GET_NON_NULL_POINTER (ecma_string_t, name_cp);
if (ECMA_STRING_GET_CONTAINER (prop_name_p) == ECMA_STRING_CONTAINER_MAP_KEY)
{
ecma_value_t key_arg = ((ecma_extended_string_t *) prop_name_p)->u.value;
if (ecma_is_value_object (key_arg))
{
ecma_gc_set_object_visited (ecma_get_object_from_value (key_arg));
}
}
}
}
prop_iter_cp = prop_iter_p->next_property_cp;
}
} /* ecma_gc_mark_container_object */
#endif /* ENABLED (JERRY_ES2015_BUILTIN_MAP) || ENABLED (JERRY_ES2015_BUILTIN_SET) */
/**
* Mark objects as visited starting from specified object as root
*/
static void
ecma_gc_mark (ecma_object_t *object_p) /**< object to mark from */
{
JERRY_ASSERT (object_p != NULL);
JERRY_ASSERT (ecma_gc_is_object_visited (object_p));
if (ecma_is_lexical_environment (object_p))
{
jmem_cpointer_t outer_lex_env_cp = object_p->u2.outer_reference_cp;
if (outer_lex_env_cp != JMEM_CP_NULL)
{
ecma_gc_set_object_visited (ECMA_GET_NON_NULL_POINTER (ecma_object_t, outer_lex_env_cp));
}
if (ecma_get_lex_env_type (object_p) != ECMA_LEXICAL_ENVIRONMENT_DECLARATIVE)
{
ecma_object_t *binding_object_p = ecma_get_lex_env_binding_object (object_p);
ecma_gc_set_object_visited (binding_object_p);
return;
}
}
else
{
jmem_cpointer_t proto_cp = object_p->u2.prototype_cp;
if (proto_cp != JMEM_CP_NULL)
{
ecma_gc_set_object_visited (ECMA_GET_NON_NULL_POINTER (ecma_object_t, proto_cp));
}
switch (ecma_get_object_type (object_p))
{
case ECMA_OBJECT_TYPE_CLASS:
{
ecma_extended_object_t *ext_object_p = (ecma_extended_object_t *) object_p;
switch (ext_object_p->u.class_prop.class_id)
{
#if ENABLED (JERRY_ES2015_BUILTIN_PROMISE)
case LIT_MAGIC_STRING_PROMISE_UL:
{
ecma_gc_mark_promise_object (ext_object_p);
break;
}
#endif /* ENABLED (JERRY_ES2015_BUILTIN_PROMISE) */
#if ENABLED (JERRY_ES2015_BUILTIN_DATAVIEW)
case LIT_MAGIC_STRING_DATAVIEW_UL:
{
ecma_dataview_object_t *dataview_p = (ecma_dataview_object_t *) object_p;
ecma_gc_set_object_visited (dataview_p->buffer_p);
break;
}
#endif /* ENABLED (JERRY_ES2015_BUILTIN_DATAVIEW) */
#if ENABLED (JERRY_ES2015_BUILTIN_MAP)
case LIT_MAGIC_STRING_MAP_UL:
{
ecma_gc_mark_container_object (object_p);
break;
}
#endif /* ENABLED (JERRY_ES2015_BUILTIN_MAP) */
#if ENABLED (JERRY_ES2015_BUILTIN_SET)
case LIT_MAGIC_STRING_SET_UL:
{
ecma_gc_mark_container_object (object_p);
break;
}
#endif /* ENABLED (JERRY_ES2015_BUILTIN_SET) */
default:
{
break;
}
}
break;
}
case ECMA_OBJECT_TYPE_PSEUDO_ARRAY:
{
ecma_extended_object_t *ext_object_p = (ecma_extended_object_t *) object_p;
switch (ext_object_p->u.pseudo_array.type)
{
#if ENABLED (JERRY_ES2015_BUILTIN_TYPEDARRAY)
case ECMA_PSEUDO_ARRAY_TYPEDARRAY:
case ECMA_PSEUDO_ARRAY_TYPEDARRAY_WITH_INFO:
{
ecma_gc_set_object_visited (ecma_typedarray_get_arraybuffer (object_p));
break;
}
#endif /* ENABLED (JERRY_ES2015_BUILTIN_TYPEDARRAY) */
#if ENABLED (JERRY_ES2015_BUILTIN_ITERATOR)
case ECMA_PSEUDO_ARRAY_ITERATOR:
case ECMA_PSEUDO_SET_ITERATOR:
case ECMA_PSEUDO_MAP_ITERATOR:
{
ecma_value_t iterated_value = ext_object_p->u.pseudo_array.u2.iterated_value;
if (!ecma_is_value_empty (iterated_value))
{
ecma_gc_set_object_visited (ecma_get_object_from_value (iterated_value));
}
break;
}
case ECMA_PSEUDO_STRING_ITERATOR:
{
break;
}
#endif /* ENABLED (JERRY_ES2015_BUILTIN_ITERATOR) */
default:
{
JERRY_ASSERT (ext_object_p->u.pseudo_array.type == ECMA_PSEUDO_ARRAY_ARGUMENTS);
ecma_object_t *lex_env_p = ECMA_GET_INTERNAL_VALUE_POINTER (ecma_object_t,
ext_object_p->u.pseudo_array.u2.lex_env_cp);
ecma_gc_set_object_visited (lex_env_p);
break;
}
}
break;
}
case ECMA_OBJECT_TYPE_ARRAY:
{
ecma_extended_object_t *ext_object_p = (ecma_extended_object_t *) object_p;
if (ext_object_p->u.array.is_fast_mode)
{
if (object_p->u1.property_list_cp != JMEM_CP_NULL)
{
ecma_value_t *values_p = ECMA_GET_NON_NULL_POINTER (ecma_value_t, object_p->u1.property_list_cp);
for (uint32_t i = 0; i < ext_object_p->u.array.length; i++)
{
if (ecma_is_value_object (values_p[i]))
{
ecma_gc_set_object_visited (ecma_get_object_from_value (values_p[i]));
}
}
}
return;
}
break;
}
case ECMA_OBJECT_TYPE_BOUND_FUNCTION:
{
ecma_gc_mark_bound_function_object (object_p);
break;
}
case ECMA_OBJECT_TYPE_FUNCTION:
{
if (!ecma_get_object_is_builtin (object_p))
{
ecma_extended_object_t *ext_func_p = (ecma_extended_object_t *) object_p;
ecma_gc_set_object_visited (ECMA_GET_INTERNAL_VALUE_POINTER (ecma_object_t,
ext_func_p->u.function.scope_cp));
}
break;
}
#if ENABLED (JERRY_ES2015)
case ECMA_OBJECT_TYPE_ARROW_FUNCTION:
{
ecma_arrow_function_t *arrow_func_p = (ecma_arrow_function_t *) object_p;
ecma_gc_set_object_visited (ECMA_GET_NON_NULL_POINTER (ecma_object_t,
arrow_func_p->scope_cp));
if (ecma_is_value_object (arrow_func_p->this_binding))
{
ecma_gc_set_object_visited (ecma_get_object_from_value (arrow_func_p->this_binding));
}
break;
}
#endif /* ENABLED (JERRY_ES2015) */
default:
{
break;
}
}
}
jmem_cpointer_t prop_iter_cp = object_p->u1.property_list_cp;
#if ENABLED (JERRY_PROPRETY_HASHMAP)
if (prop_iter_cp != JMEM_CP_NULL)
{
ecma_property_header_t *prop_iter_p = ECMA_GET_NON_NULL_POINTER (ecma_property_header_t, prop_iter_cp);
if (prop_iter_p->types[0] == ECMA_PROPERTY_TYPE_HASHMAP)
{
prop_iter_cp = prop_iter_p->next_property_cp;
}
}
#endif /* ENABLED (JERRY_PROPRETY_HASHMAP) */
while (prop_iter_cp != JMEM_CP_NULL)
{
ecma_property_header_t *prop_iter_p = ECMA_GET_NON_NULL_POINTER (ecma_property_header_t, prop_iter_cp);
JERRY_ASSERT (ECMA_PROPERTY_IS_PROPERTY_PAIR (prop_iter_p));
ecma_gc_mark_properties ((ecma_property_pair_t *) prop_iter_p);
prop_iter_cp = prop_iter_p->next_property_cp;
}
} /* ecma_gc_mark */
/**
* Free the native handle/pointer by calling its free callback.
*/
static void
ecma_gc_free_native_pointer (ecma_property_t *property_p) /**< property */
{
JERRY_ASSERT (property_p != NULL);
ecma_property_value_t *value_p = ECMA_PROPERTY_VALUE_PTR (property_p);
ecma_native_pointer_t *native_pointer_p;
native_pointer_p = ECMA_GET_INTERNAL_VALUE_POINTER (ecma_native_pointer_t,
value_p->value);
#ifndef JERRY_NDEBUG
JERRY_CONTEXT (status_flags) &= (uint32_t) ~ECMA_STATUS_API_AVAILABLE;
#endif /* !JERRY_NDEBUG */
while (native_pointer_p != NULL)
{
if (native_pointer_p->info_p != NULL)
{
ecma_object_native_free_callback_t free_cb = native_pointer_p->info_p->free_cb;
if (free_cb != NULL)
{
free_cb (native_pointer_p->data_p);
}
}
ecma_native_pointer_t *next_p = native_pointer_p->next_p;
jmem_heap_free_block (native_pointer_p, sizeof (ecma_native_pointer_t));
native_pointer_p = next_p;
}
#ifndef JERRY_NDEBUG
JERRY_CONTEXT (status_flags) |= ECMA_STATUS_API_AVAILABLE;
#endif /* !JERRY_NDEBUG */
} /* ecma_gc_free_native_pointer */
/**
* Free specified fast access mode array object.
*/
static void
ecma_free_fast_access_array (ecma_object_t *object_p) /**< fast access mode array object to free */
{
JERRY_ASSERT (ecma_get_object_type (object_p) == ECMA_OBJECT_TYPE_ARRAY);
ecma_extended_object_t *ext_object_p = (ecma_extended_object_t *) object_p;
JERRY_ASSERT (ext_object_p->u.array.is_fast_mode);
const uint32_t aligned_length = ECMA_FAST_ARRAY_ALIGN_LENGTH (ext_object_p->u.array.length);
if (object_p->u1.property_list_cp != JMEM_CP_NULL)
{
ecma_value_t *values_p = ECMA_GET_NON_NULL_POINTER (ecma_value_t, object_p->u1.property_list_cp);
for (uint32_t i = 0; i < aligned_length; i++)
{
ecma_free_value_if_not_object (values_p[i]);
}
jmem_heap_free_block (values_p, aligned_length * sizeof (ecma_value_t));
}
JERRY_ASSERT (JERRY_CONTEXT (ecma_gc_objects_number) > 0);
JERRY_CONTEXT (ecma_gc_objects_number)--;
ecma_dealloc_extended_object (object_p, sizeof (ecma_extended_object_t));
} /* ecma_free_fast_access_array */
/**
* Free specified object.
*/
static void
ecma_gc_free_object (ecma_object_t *object_p) /**< object to free */
{
JERRY_ASSERT (object_p != NULL
&& !ecma_gc_is_object_visited (object_p)
&& ((object_p->type_flags_refs & ECMA_OBJECT_REF_MASK) == ECMA_OBJECT_NON_VISITED));
bool obj_is_not_lex_env = !ecma_is_lexical_environment (object_p);
if (obj_is_not_lex_env
|| ecma_get_lex_env_type (object_p) == ECMA_LEXICAL_ENVIRONMENT_DECLARATIVE)
{
if (obj_is_not_lex_env && ecma_get_object_type (object_p) == ECMA_OBJECT_TYPE_ARRAY)
{
ecma_extended_object_t *ext_object_p = (ecma_extended_object_t *) object_p;
if (ext_object_p->u.array.is_fast_mode)
{
ecma_free_fast_access_array (object_p);
return;
}
}
jmem_cpointer_t prop_iter_cp = object_p->u1.property_list_cp;
#if ENABLED (JERRY_PROPRETY_HASHMAP)
if (prop_iter_cp != JMEM_CP_NULL)
{
ecma_property_header_t *prop_iter_p = ECMA_GET_NON_NULL_POINTER (ecma_property_header_t,
prop_iter_cp);
if (prop_iter_p->types[0] == ECMA_PROPERTY_TYPE_HASHMAP)
{
ecma_property_hashmap_free (object_p);
prop_iter_cp = object_p->u1.property_list_cp;
}
}
#endif /* ENABLED (JERRY_PROPRETY_HASHMAP) */
while (prop_iter_cp != JMEM_CP_NULL)
{
ecma_property_header_t *prop_iter_p = ECMA_GET_NON_NULL_POINTER (ecma_property_header_t, prop_iter_cp);
JERRY_ASSERT (ECMA_PROPERTY_IS_PROPERTY_PAIR (prop_iter_p));
/* Both cannot be deleted. */
JERRY_ASSERT (prop_iter_p->types[0] != ECMA_PROPERTY_TYPE_DELETED
|| prop_iter_p->types[1] != ECMA_PROPERTY_TYPE_DELETED);
ecma_property_pair_t *prop_pair_p = (ecma_property_pair_t *) prop_iter_p;
for (int i = 0; i < ECMA_PROPERTY_PAIR_ITEM_COUNT; i++)
{
ecma_property_t *property_p = (ecma_property_t *) (prop_iter_p->types + i);
jmem_cpointer_t name_cp = prop_pair_p->names_cp[i];
/* Call the native's free callback. */
if (JERRY_UNLIKELY (ECMA_PROPERTY_GET_NAME_TYPE (*property_p) == ECMA_DIRECT_STRING_MAGIC
&& (name_cp == LIT_INTERNAL_MAGIC_STRING_NATIVE_POINTER)))
{
ecma_gc_free_native_pointer (property_p);
}
if (prop_iter_p->types[i] != ECMA_PROPERTY_TYPE_DELETED)
{
ecma_free_property (object_p, name_cp, property_p);
}
}
prop_iter_cp = prop_iter_p->next_property_cp;
ecma_dealloc_property_pair (prop_pair_p);
}
}
JERRY_ASSERT (JERRY_CONTEXT (ecma_gc_objects_number) > 0);
JERRY_CONTEXT (ecma_gc_objects_number)--;
if (obj_is_not_lex_env)
{
ecma_object_type_t object_type = ecma_get_object_type (object_p);
size_t ext_object_size = sizeof (ecma_extended_object_t);
if (ecma_get_object_is_builtin (object_p))
{
uint8_t length_and_bitset_size;
if (object_type == ECMA_OBJECT_TYPE_CLASS
|| object_type == ECMA_OBJECT_TYPE_ARRAY)
{
ext_object_size = sizeof (ecma_extended_built_in_object_t);
length_and_bitset_size = ((ecma_extended_built_in_object_t *) object_p)->built_in.length_and_bitset_size;
}
else
{
length_and_bitset_size = ((ecma_extended_object_t *) object_p)->u.built_in.length_and_bitset_size;
}
ext_object_size += (2 * sizeof (uint32_t)) * (length_and_bitset_size >> ECMA_BUILT_IN_BITSET_SHIFT);
}
if (object_type == ECMA_OBJECT_TYPE_CLASS)
{
ecma_extended_object_t *ext_object_p = (ecma_extended_object_t *) object_p;
switch (ext_object_p->u.class_prop.class_id)
{
#if ENABLED (JERRY_ES2015)
case LIT_MAGIC_STRING_SYMBOL_UL:
#endif /* ENABLED (JERRY_ES2015) */
case LIT_MAGIC_STRING_STRING_UL:
case LIT_MAGIC_STRING_NUMBER_UL:
{
ecma_free_value (ext_object_p->u.class_prop.u.value);
break;
}
case LIT_MAGIC_STRING_DATE_UL:
{
ecma_number_t *num_p = ECMA_GET_INTERNAL_VALUE_POINTER (ecma_number_t,
ext_object_p->u.class_prop.u.value);
ecma_dealloc_number (num_p);
break;
}
case LIT_MAGIC_STRING_REGEXP_UL:
{
ecma_compiled_code_t *bytecode_p;
bytecode_p = ECMA_GET_INTERNAL_VALUE_ANY_POINTER (ecma_compiled_code_t,
ext_object_p->u.class_prop.u.value);
if (bytecode_p != NULL)
{
ecma_bytecode_deref (bytecode_p);
}
break;
}
#if ENABLED (JERRY_ES2015_BUILTIN_TYPEDARRAY)
case LIT_MAGIC_STRING_ARRAY_BUFFER_UL:
{
ecma_length_t arraybuffer_length = ext_object_p->u.class_prop.u.length;
size_t size;
if (ECMA_ARRAYBUFFER_HAS_EXTERNAL_MEMORY (ext_object_p))
{
size = sizeof (ecma_arraybuffer_external_info);
/* Call external free callback if any. */
ecma_arraybuffer_external_info *array_p = (ecma_arraybuffer_external_info *) ext_object_p;
JERRY_ASSERT (array_p != NULL);
if (array_p->free_cb != NULL)
{
(array_p->free_cb) (array_p->buffer_p);
}
}
else
{
size = sizeof (ecma_extended_object_t) + arraybuffer_length;
}
ecma_dealloc_extended_object (object_p, size);
return;
}
#endif /* ENABLED (JERRY_ES2015_BUILTIN_TYPEDARRAY) */
#if ENABLED (JERRY_ES2015_BUILTIN_PROMISE)
case LIT_MAGIC_STRING_PROMISE_UL:
{
ecma_free_value_if_not_object (ext_object_p->u.class_prop.u.value);
ecma_collection_free_if_not_object (((ecma_promise_object_t *) object_p)->fulfill_reactions);
ecma_collection_free_if_not_object (((ecma_promise_object_t *) object_p)->reject_reactions);
ecma_dealloc_extended_object (object_p, sizeof (ecma_promise_object_t));
return;
}
#endif /* ENABLED (JERRY_ES2015_BUILTIN_PROMISE) */
#if ENABLED (JERRY_ES2015_BUILTIN_SET)
case LIT_MAGIC_STRING_SET_UL:
{
ecma_dealloc_extended_object (object_p, sizeof (ecma_map_object_t));
return;
}
#endif /* ENABLED (JERRY_ES2015_BUILTIN_SET) */
#if ENABLED (JERRY_ES2015_BUILTIN_MAP)
case LIT_MAGIC_STRING_MAP_UL:
{
ecma_dealloc_extended_object (object_p, sizeof (ecma_map_object_t));
return;
}
#endif /* ENABLED (JERRY_ES2015_BUILTIN_MAP) */
#if ENABLED (JERRY_ES2015_BUILTIN_DATAVIEW)
case LIT_MAGIC_STRING_DATAVIEW_UL:
{
ecma_dealloc_extended_object (object_p, sizeof (ecma_dataview_object_t));
return;
}
#endif /* ENABLED (JERRY_ES2015_BUILTIN_DATAVIEW) */
default:
{
/* The undefined id represents an uninitialized class. */
JERRY_ASSERT (ext_object_p->u.class_prop.class_id == LIT_MAGIC_STRING_UNDEFINED
|| ext_object_p->u.class_prop.class_id == LIT_MAGIC_STRING_ARGUMENTS_UL
|| ext_object_p->u.class_prop.class_id == LIT_MAGIC_STRING_BOOLEAN_UL
|| ext_object_p->u.class_prop.class_id == LIT_MAGIC_STRING_ERROR_UL);
break;
}
}
ecma_dealloc_extended_object (object_p, ext_object_size);
return;
}
if (ecma_get_object_is_builtin (object_p)
|| object_type == ECMA_OBJECT_TYPE_ARRAY
|| object_type == ECMA_OBJECT_TYPE_EXTERNAL_FUNCTION)
{
ecma_dealloc_extended_object (object_p, ext_object_size);
return;
}
if (object_type == ECMA_OBJECT_TYPE_FUNCTION)
{
/* Function with byte-code (not a built-in function). */
ecma_extended_object_t *ext_func_p = (ecma_extended_object_t *) object_p;
#if ENABLED (JERRY_SNAPSHOT_EXEC)
if (ext_func_p->u.function.bytecode_cp != ECMA_NULL_POINTER)
{
ecma_bytecode_deref (ECMA_GET_INTERNAL_VALUE_POINTER (ecma_compiled_code_t,
ext_func_p->u.function.bytecode_cp));
ecma_dealloc_extended_object (object_p, sizeof (ecma_extended_object_t));
}
else
{
ecma_dealloc_extended_object (object_p, sizeof (ecma_static_function_t));
}
#else /* !ENABLED (JERRY_SNAPSHOT_EXEC) */
ecma_bytecode_deref (ECMA_GET_INTERNAL_VALUE_POINTER (ecma_compiled_code_t,
ext_func_p->u.function.bytecode_cp));
ecma_dealloc_extended_object (object_p, sizeof (ecma_extended_object_t));
#endif /* ENABLED (JERRY_SNAPSHOT_EXEC) */
return;
}
#if ENABLED (JERRY_ES2015)
if (object_type == ECMA_OBJECT_TYPE_ARROW_FUNCTION)
{
ecma_arrow_function_t *arrow_func_p = (ecma_arrow_function_t *) object_p;
ecma_free_value_if_not_object (arrow_func_p->this_binding);
#if ENABLED (JERRY_SNAPSHOT_EXEC)
if (arrow_func_p->bytecode_cp != ECMA_NULL_POINTER)
{
ecma_bytecode_deref (ECMA_GET_NON_NULL_POINTER (ecma_compiled_code_t,
arrow_func_p->bytecode_cp));
ecma_dealloc_extended_object (object_p, sizeof (ecma_arrow_function_t));
}
else
{
ecma_dealloc_extended_object (object_p, sizeof (ecma_static_arrow_function_t));
}
#else /* !ENABLED (JERRY_SNAPSHOT_EXEC) */
ecma_bytecode_deref (ECMA_GET_NON_NULL_POINTER (ecma_compiled_code_t,
arrow_func_p->bytecode_cp));
ecma_dealloc_extended_object (object_p, sizeof (ecma_arrow_function_t));
#endif /* ENABLED (JERRY_SNAPSHOT_EXEC) */
return;
}
#endif /* ENABLED (JERRY_ES2015) */
if (object_type == ECMA_OBJECT_TYPE_PSEUDO_ARRAY)
{
ecma_extended_object_t *ext_object_p = (ecma_extended_object_t *) object_p;
switch (ext_object_p->u.pseudo_array.type)
{
#if ENABLED (JERRY_ES2015_BUILTIN_TYPEDARRAY)
case ECMA_PSEUDO_ARRAY_TYPEDARRAY:
{
ecma_dealloc_extended_object (object_p, sizeof (ecma_extended_object_t));
return;
}
case ECMA_PSEUDO_ARRAY_TYPEDARRAY_WITH_INFO:
{
ecma_dealloc_extended_object (object_p, sizeof (ecma_extended_typedarray_object_t));
return;
}
#endif /* ENABLED (JERRY_ES2015_BUILTIN_TYPEDARRAY) */
#if ENABLED (JERRY_ES2015_BUILTIN_ITERATOR)
case ECMA_PSEUDO_ARRAY_ITERATOR:
case ECMA_PSEUDO_SET_ITERATOR:
case ECMA_PSEUDO_MAP_ITERATOR:
{
ecma_dealloc_extended_object (object_p, sizeof (ecma_extended_object_t));
return;
}
case ECMA_PSEUDO_STRING_ITERATOR:
{
ecma_value_t iterated_value = ext_object_p->u.pseudo_array.u2.iterated_value;
if (!ecma_is_value_empty (iterated_value))
{
ecma_deref_ecma_string (ecma_get_string_from_value (iterated_value));
}
ecma_dealloc_extended_object (object_p, sizeof (ecma_extended_object_t));
return;
}
#endif /* ENABLED (JERRY_ES2015_BUILTIN_ITERATOR) */
default:
{
JERRY_ASSERT (ext_object_p->u.pseudo_array.type == ECMA_PSEUDO_ARRAY_ARGUMENTS);
ecma_length_t formal_params_number = ext_object_p->u.pseudo_array.u1.length;
ecma_value_t *arg_Literal_p = (ecma_value_t *) (ext_object_p + 1);
for (ecma_length_t i = 0; i < formal_params_number; i++)
{
if (arg_Literal_p[i] != ECMA_VALUE_EMPTY)
{
ecma_string_t *name_p = ecma_get_string_from_value (arg_Literal_p[i]);
ecma_deref_ecma_string (name_p);
}
}
size_t formal_params_size = formal_params_number * sizeof (ecma_value_t);
ecma_dealloc_extended_object (object_p, sizeof (ecma_extended_object_t) + formal_params_size);
return;
}
}
}
if (object_type == ECMA_OBJECT_TYPE_BOUND_FUNCTION)
{
ecma_extended_object_t *ext_function_p = (ecma_extended_object_t *) object_p;
ecma_value_t args_len_or_this = ext_function_p->u.bound_function.args_len_or_this;
if (!ecma_is_value_integer_number (args_len_or_this))
{
ecma_free_value_if_not_object (args_len_or_this);
ecma_dealloc_extended_object (object_p, sizeof (ecma_extended_object_t));
return;
}
ecma_integer_value_t args_length = ecma_get_integer_from_value (args_len_or_this);
ecma_value_t *args_p = (ecma_value_t *) (ext_function_p + 1);
for (ecma_integer_value_t i = 0; i < args_length; i++)
{
ecma_free_value_if_not_object (args_p[i]);
}
size_t args_size = ((size_t) args_length) * sizeof (ecma_value_t);
ecma_dealloc_extended_object (object_p, sizeof (ecma_extended_object_t) + args_size);
return;
}
}
ecma_dealloc_object (object_p);
} /* ecma_gc_free_object */
/**
* Run garbage collection, freeing objects that are no longer referenced.
*/
void
ecma_gc_run (void)
{
#if (JERRY_GC_MARK_LIMIT != 0)
JERRY_ASSERT (JERRY_CONTEXT (ecma_gc_mark_recursion_limit) == JERRY_GC_MARK_LIMIT);
#endif /* (JERRY_GC_MARK_LIMIT != 0) */
JERRY_CONTEXT (ecma_gc_new_objects) = 0;
ecma_object_t black_list_head;
black_list_head.gc_next_cp = JMEM_CP_NULL;
ecma_object_t *black_end_p = &black_list_head;
ecma_object_t white_gray_list_head;
white_gray_list_head.gc_next_cp = JERRY_CONTEXT (ecma_gc_objects_cp);
ecma_object_t *obj_prev_p = &white_gray_list_head;
jmem_cpointer_t obj_iter_cp = obj_prev_p->gc_next_cp;
ecma_object_t *obj_iter_p;
/* Move root objects (i.e. they have global or stack references) to the black list. */
while (obj_iter_cp != JMEM_CP_NULL)
{
obj_iter_p = JMEM_CP_GET_NON_NULL_POINTER (ecma_object_t, obj_iter_cp);
const jmem_cpointer_t obj_next_cp = obj_iter_p->gc_next_cp;
JERRY_ASSERT (obj_prev_p == NULL
|| ECMA_GET_NON_NULL_POINTER (ecma_object_t, obj_prev_p->gc_next_cp) == obj_iter_p);
if (obj_iter_p->type_flags_refs >= ECMA_OBJECT_REF_ONE)
{
/* Moving the object to list of marked objects. */
obj_prev_p->gc_next_cp = obj_next_cp;
black_end_p->gc_next_cp = obj_iter_cp;
black_end_p = obj_iter_p;
}
else
{
obj_iter_p->type_flags_refs |= ECMA_OBJECT_NON_VISITED;
obj_prev_p = obj_iter_p;
}
obj_iter_cp = obj_next_cp;
}
black_end_p->gc_next_cp = JMEM_CP_NULL;
/* Mark root objects. */
obj_iter_cp = black_list_head.gc_next_cp;
while (obj_iter_cp != JMEM_CP_NULL)
{
obj_iter_p = JMEM_CP_GET_NON_NULL_POINTER (ecma_object_t, obj_iter_cp);
ecma_gc_mark (obj_iter_p);
obj_iter_cp = obj_iter_p->gc_next_cp;
}
/* Mark non-root objects. */
bool marked_anything_during_current_iteration;
do
{
#if (JERRY_GC_MARK_LIMIT != 0)
JERRY_ASSERT (JERRY_CONTEXT (ecma_gc_mark_recursion_limit) == JERRY_GC_MARK_LIMIT);
#endif /* (JERRY_GC_MARK_LIMIT != 0) */
marked_anything_during_current_iteration = false;
obj_prev_p = &white_gray_list_head;
obj_iter_cp = obj_prev_p->gc_next_cp;
while (obj_iter_cp != JMEM_CP_NULL)
{
obj_iter_p = JMEM_CP_GET_NON_NULL_POINTER (ecma_object_t, obj_iter_cp);
const jmem_cpointer_t obj_next_cp = obj_iter_p->gc_next_cp;
JERRY_ASSERT (obj_prev_p == NULL
|| ECMA_GET_NON_NULL_POINTER (ecma_object_t, obj_prev_p->gc_next_cp) == obj_iter_p);
if (ecma_gc_is_object_visited (obj_iter_p))
{
/* Moving the object to list of marked objects */
obj_prev_p->gc_next_cp = obj_next_cp;
black_end_p->gc_next_cp = obj_iter_cp;
black_end_p = obj_iter_p;
#if (JERRY_GC_MARK_LIMIT != 0)
if (obj_iter_p->type_flags_refs >= ECMA_OBJECT_REF_ONE)
{
/* Set the reference count of non-marked gray object to 0 */
obj_iter_p->type_flags_refs = (uint16_t) (obj_iter_p->type_flags_refs & (ECMA_OBJECT_REF_ONE - 1));
ecma_gc_mark (obj_iter_p);
marked_anything_during_current_iteration = true;
}
#else /* (JERRY_GC_MARK_LIMIT == 0) */
marked_anything_during_current_iteration = true;
#endif /* (JERRY_GC_MARK_LIMIT != 0) */
}
else
{
obj_prev_p = obj_iter_p;
}
obj_iter_cp = obj_next_cp;
}
}
while (marked_anything_during_current_iteration);
black_end_p->gc_next_cp = JMEM_CP_NULL;
/* Sweep objects that are currently unmarked. */
obj_iter_cp = white_gray_list_head.gc_next_cp;
while (obj_iter_cp != JMEM_CP_NULL)
{
obj_iter_p = JMEM_CP_GET_NON_NULL_POINTER (ecma_object_t, obj_iter_cp);
const jmem_cpointer_t obj_next_cp = obj_iter_p->gc_next_cp;
JERRY_ASSERT (!ecma_gc_is_object_visited (obj_iter_p));
ecma_gc_free_object (obj_iter_p);
obj_iter_cp = obj_next_cp;
}
JERRY_CONTEXT (ecma_gc_objects_cp) = black_list_head.gc_next_cp;
#if ENABLED (JERRY_BUILTIN_REGEXP)
/* Free RegExp bytecodes stored in cache */
re_cache_gc_run ();
#endif /* ENABLED (JERRY_BUILTIN_REGEXP) */
} /* ecma_gc_run */
/**
* Try to free some memory (depending on memory pressure).
*
* When called with JMEM_PRESSURE_FULL, the engine will be terminated with ERR_OUT_OF_MEMORY.
*/
void
ecma_free_unused_memory (jmem_pressure_t pressure) /**< current pressure */
{
#if ENABLED (JERRY_DEBUGGER)
while ((JERRY_CONTEXT (debugger_flags) & JERRY_DEBUGGER_CONNECTED)
&& JERRY_CONTEXT (debugger_byte_code_free_tail) != ECMA_NULL_POINTER)
{
/* Wait until all byte code is freed or the connection is aborted. */
jerry_debugger_receive (NULL);
}
#endif /* ENABLED (JERRY_DEBUGGER) */
if (JERRY_LIKELY (pressure == JMEM_PRESSURE_LOW))
{
#if ENABLED (JERRY_PROPRETY_HASHMAP)
if (JERRY_CONTEXT (ecma_prop_hashmap_alloc_state) > ECMA_PROP_HASHMAP_ALLOC_ON)
{
--JERRY_CONTEXT (ecma_prop_hashmap_alloc_state);
}
JERRY_CONTEXT (status_flags) &= (uint32_t) ~ECMA_STATUS_HIGH_PRESSURE_GC;
#endif /* ENABLED (JERRY_PROPRETY_HASHMAP) */
/*
* If there is enough newly allocated objects since last GC, probably it is worthwhile to start GC now.
* Otherwise, probability to free sufficient space is considered to be low.
*/
size_t new_objects_fraction = CONFIG_ECMA_GC_NEW_OBJECTS_FRACTION;
if (JERRY_CONTEXT (ecma_gc_new_objects) * new_objects_fraction > JERRY_CONTEXT (ecma_gc_objects_number))
{
ecma_gc_run ();
}
return;
}
else if (pressure == JMEM_PRESSURE_HIGH)
{
/* Freeing as much memory as we currently can */
#if ENABLED (JERRY_PROPRETY_HASHMAP)
if (JERRY_CONTEXT (status_flags) & ECMA_STATUS_HIGH_PRESSURE_GC)
{
JERRY_CONTEXT (ecma_prop_hashmap_alloc_state) = ECMA_PROP_HASHMAP_ALLOC_MAX;
}
else if (JERRY_CONTEXT (ecma_prop_hashmap_alloc_state) < ECMA_PROP_HASHMAP_ALLOC_MAX)
{
++JERRY_CONTEXT (ecma_prop_hashmap_alloc_state);
JERRY_CONTEXT (status_flags) |= ECMA_STATUS_HIGH_PRESSURE_GC;
}
#endif /* ENABLED (JERRY_PROPRETY_HASHMAP) */
ecma_gc_run ();
#if ENABLED (JERRY_PROPRETY_HASHMAP)
/* Free hashmaps of remaining objects. */
jmem_cpointer_t obj_iter_cp = JERRY_CONTEXT (ecma_gc_objects_cp);
while (obj_iter_cp != JMEM_CP_NULL)
{
ecma_object_t *obj_iter_p = ECMA_GET_NON_NULL_POINTER (ecma_object_t, obj_iter_cp);
if (!ecma_is_lexical_environment (obj_iter_p)
|| ecma_get_lex_env_type (obj_iter_p) == ECMA_LEXICAL_ENVIRONMENT_DECLARATIVE)
{
if (!ecma_is_lexical_environment (obj_iter_p)
&& ecma_get_object_type (obj_iter_p) == ECMA_OBJECT_TYPE_ARRAY
&& ((ecma_extended_object_t *) obj_iter_p)->u.array.is_fast_mode)
{
obj_iter_cp = obj_iter_p->gc_next_cp;
continue;
}
jmem_cpointer_t prop_iter_cp = obj_iter_p->u1.property_list_cp;
if (prop_iter_cp != JMEM_CP_NULL)
{
ecma_property_header_t *prop_iter_p = ECMA_GET_NON_NULL_POINTER (ecma_property_header_t, prop_iter_cp);
if (prop_iter_p->types[0] == ECMA_PROPERTY_TYPE_HASHMAP)
{
ecma_property_hashmap_free (obj_iter_p);
}
}
}
obj_iter_cp = obj_iter_p->gc_next_cp;
}
#endif /* ENABLED (JERRY_PROPRETY_HASHMAP) */
jmem_pools_collect_empty ();
return;
}
else if (JERRY_UNLIKELY (pressure == JMEM_PRESSURE_FULL))
{
jerry_fatal (ERR_OUT_OF_MEMORY);
}
else
{
JERRY_ASSERT (pressure == JMEM_PRESSURE_NONE);
JERRY_UNREACHABLE ();
}
} /* ecma_free_unused_memory */
/**
* @}
* @}
*/
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