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jerryscript/jerry-core/ecma/base/ecma-gc.c
Zoltan Herczeg 838e74df0f Remove include jerryscript.h from jrt.h. (#1803) 
Fixes #1791.

JerryScript-DCO-1.0-Signed-off-by: Zoltan Herczeg zherczeg.u-szeged@partner.samsung.com
2017-05-11 12:42:47 +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-globals.h"
#include "ecma-gc.h"
#include "ecma-helpers.h"
#include "ecma-lcache.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"
#ifndef CONFIG_DISABLE_ES2015_TYPEDARRAY_BUILTIN
#include "ecma-typedarray-object.h"
#endif
#ifndef CONFIG_DISABLE_ES2015_PROMISE_BUILTIN
#include "ecma-promise-object.h"
#endif
/* TODO: Extract GC to a separate component */
/** \addtogroup ecma ECMA
* @{
*
* \addtogroup ecmagc Garbage collector
* @{
*/
/**
* Current state of an object's visited flag that
* indicates whether the object is in visited state:
*
* visited_field | visited_flip_flag | real_value
* false | false | false
* false | true | true
* true | false | true
* true | true | false
*/
static void ecma_gc_mark (ecma_object_t *object_p);
static void ecma_gc_sweep (ecma_object_t *object_p);
/**
* Get next object in list of objects with same generation.
*/
static inline ecma_object_t *
ecma_gc_get_object_next (ecma_object_t *object_p) /**< object */
{
JERRY_ASSERT (object_p != NULL);
return ECMA_GET_POINTER (ecma_object_t, object_p->gc_next_cp);
} /* ecma_gc_get_object_next */
/**
* Set next object in list of objects with same generation.
*/
static inline void
ecma_gc_set_object_next (ecma_object_t *object_p, /**< object */
ecma_object_t *next_object_p) /**< next object */
{
JERRY_ASSERT (object_p != NULL);
ECMA_SET_POINTER (object_p->gc_next_cp, next_object_p);
} /* ecma_gc_set_object_next */
/**
* Get visited flag of the object.
*/
static inline bool
ecma_gc_is_object_visited (ecma_object_t *object_p) /**< object */
{
JERRY_ASSERT (object_p != NULL);
bool flag_value = (object_p->type_flags_refs & ECMA_OBJECT_FLAG_GC_VISITED) != 0;
return flag_value != JERRY_CONTEXT (ecma_gc_visited_flip_flag);
} /* ecma_gc_is_object_visited */
/**
* Set visited flag of the object.
*/
static inline void
ecma_gc_set_object_visited (ecma_object_t *object_p, /**< object */
bool is_visited) /**< flag value */
{
JERRY_ASSERT (object_p != NULL);
if (is_visited != JERRY_CONTEXT (ecma_gc_visited_flip_flag))
{
object_p->type_flags_refs = (uint16_t) (object_p->type_flags_refs | ECMA_OBJECT_FLAG_GC_VISITED);
}
else
{
object_p->type_flags_refs = (uint16_t) (object_p->type_flags_refs & ~ECMA_OBJECT_FLAG_GC_VISITED);
}
} /* 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);
ecma_gc_set_object_next (object_p, JERRY_CONTEXT (ecma_gc_objects_lists) [ECMA_GC_COLOR_WHITE_GRAY]);
JERRY_CONTEXT (ecma_gc_objects_lists) [ECMA_GC_COLOR_WHITE_GRAY] = object_p;
/* Should be set to false at the beginning of garbage collection */
ecma_gc_set_object_visited (object_p, false);
} /* ecma_init_gc_info */
/**
* Increase reference counter of an object
*/
void
ecma_ref_object (ecma_object_t *object_p) /**< object */
{
if (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
*/
void
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 void
ecma_gc_mark_property (ecma_property_pair_t *property_pair_p, /**< property pair */
uint32_t index) /**< property index */
{
uint8_t property = property_pair_p->header.types[index];
switch (ECMA_PROPERTY_GET_TYPE (property))
{
case ECMA_PROPERTY_TYPE_NAMEDDATA:
{
if (ECMA_PROPERTY_GET_NAME_TYPE (property) == ECMA_STRING_CONTAINER_MAGIC_STRING
&& property_pair_p->names_cp[index] >= LIT_NEED_MARK_MAGIC_STRING__COUNT)
{
break;
}
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, true);
}
break;
}
case ECMA_PROPERTY_TYPE_NAMEDACCESSOR:
{
ecma_property_value_t *accessor_objs_p = property_pair_p->values + index;
ecma_object_t *getter_obj_p = ecma_get_named_accessor_property_getter (accessor_objs_p);
ecma_object_t *setter_obj_p = ecma_get_named_accessor_property_setter (accessor_objs_p);
if (getter_obj_p != NULL)
{
ecma_gc_set_object_visited (getter_obj_p, true);
}
if (setter_obj_p != NULL)
{
ecma_gc_set_object_visited (setter_obj_p, true);
}
break;
}
case ECMA_PROPERTY_TYPE_SPECIAL:
{
JERRY_ASSERT (ECMA_PROPERTY_GET_SPECIAL_PROPERTY_TYPE (&property) == ECMA_SPECIAL_PROPERTY_DELETED
|| ECMA_PROPERTY_GET_SPECIAL_PROPERTY_TYPE (&property) == ECMA_SPECIAL_PROPERTY_HASHMAP);
break;
}
default:
{
JERRY_UNREACHABLE ();
break;
}
}
} /* ecma_gc_mark_property */
/**
* Mark objects as visited starting from specified object as root
*/
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));
bool traverse_properties = true;
if (ecma_is_lexical_environment (object_p))
{
ecma_object_t *lex_env_p = ecma_get_lex_env_outer_reference (object_p);
if (lex_env_p != NULL)
{
ecma_gc_set_object_visited (lex_env_p, true);
}
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, true);
traverse_properties = false;
}
}
else
{
ecma_object_t *proto_p = ecma_get_object_prototype (object_p);
if (proto_p != NULL)
{
ecma_gc_set_object_visited (proto_p, true);
}
switch (ecma_get_object_type (object_p))
{
#ifndef CONFIG_DISABLE_ES2015_PROMISE_BUILTIN
case ECMA_OBJECT_TYPE_CLASS:
{
ecma_extended_object_t *ext_object_p = (ecma_extended_object_t *) object_p;
if (ext_object_p->u.class_prop.class_id == LIT_MAGIC_STRING_PROMISE_UL)
{
/* 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), true);
}
/* Mark all reactions. */
ecma_collection_iterator_t iter;
ecma_collection_iterator_init (&iter, ((ecma_promise_object_t *) ext_object_p)->fulfill_reactions);
while (ecma_collection_iterator_next (&iter))
{
ecma_gc_set_object_visited (ecma_get_object_from_value (*iter.current_value_p), true);
}
ecma_collection_iterator_init (&iter, ((ecma_promise_object_t *) ext_object_p)->reject_reactions);
while (ecma_collection_iterator_next (&iter))
{
ecma_gc_set_object_visited (ecma_get_object_from_value (*iter.current_value_p), true);
}
}
break;
}
#endif /*! CONFIG_DISABLE_ES2015_PROMISE_BUILTIN */
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)
{
case 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, true);
break;
}
#ifndef CONFIG_DISABLE_ES2015_TYPEDARRAY_BUILTIN
case ECMA_PSEUDO_ARRAY_TYPEDARRAY:
case ECMA_PSEUDO_ARRAY_TYPEDARRAY_WITH_INFO:
{
ecma_gc_set_object_visited (ecma_typedarray_get_arraybuffer (object_p), true);
break;
}
#endif /* !CONFIG_DISABLE_ES2015_TYPEDARRAY_BUILTIN */
default:
{
JERRY_UNREACHABLE ();
break;
}
}
break;
}
case 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, true);
ecma_length_t args_length = ext_function_p->u.bound_function.args_length;
ecma_value_t *args_p = (ecma_value_t *) (ext_function_p + 1);
JERRY_ASSERT (args_length > 0);
for (ecma_length_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]), true);
}
}
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_object_t *scope_p = ECMA_GET_INTERNAL_VALUE_POINTER (ecma_object_t,
ext_func_p->u.function.scope_cp);
ecma_gc_set_object_visited (scope_p, true);
}
break;
}
default:
{
break;
}
}
}
if (traverse_properties)
{
ecma_property_header_t *prop_iter_p = ecma_get_property_list (object_p);
while (prop_iter_p != NULL)
{
JERRY_ASSERT (prop_iter_p->types[0] == ECMA_PROPERTY_TYPE_HASHMAP
|| ECMA_PROPERTY_IS_PROPERTY_PAIR (prop_iter_p));
ecma_gc_mark_property ((ecma_property_pair_t *) prop_iter_p, 0);
ecma_gc_mark_property ((ecma_property_pair_t *) prop_iter_p, 1);
prop_iter_p = ECMA_GET_POINTER (ecma_property_header_t,
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 */
lit_magic_string_id_t id) /**< identifier of internal property */
{
JERRY_ASSERT (property_p != NULL);
JERRY_ASSERT (id == LIT_INTERNAL_MAGIC_STRING_NATIVE_HANDLE
|| id == LIT_INTERNAL_MAGIC_STRING_NATIVE_POINTER);
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);
if (id == LIT_INTERNAL_MAGIC_STRING_NATIVE_HANDLE)
{
if (native_pointer_p->u.callback_p != NULL)
{
native_pointer_p->u.callback_p ((uintptr_t) native_pointer_p->data_p);
}
}
else
{
if (native_pointer_p->u.info_p != NULL)
{
ecma_object_native_free_callback_t free_cb = native_pointer_p->u.info_p->free_cb;
if (free_cb != NULL)
{
free_cb (native_pointer_p->data_p);
}
}
}
} /* ecma_gc_free_native_pointer */
/**
* Free specified object.
*/
void
ecma_gc_sweep (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_ONE);
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)
{
ecma_property_header_t *prop_iter_p = ecma_get_property_list (object_p);
if (prop_iter_p != NULL && prop_iter_p->types[0] == ECMA_PROPERTY_TYPE_HASHMAP)
{
ecma_property_hashmap_free (object_p);
prop_iter_p = ecma_get_property_list (object_p);
}
while (prop_iter_p != NULL)
{
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 (ECMA_PROPERTY_GET_NAME_TYPE (*property_p) == ECMA_STRING_CONTAINER_MAGIC_STRING
&& (name_cp == LIT_INTERNAL_MAGIC_STRING_NATIVE_HANDLE
|| name_cp == LIT_INTERNAL_MAGIC_STRING_NATIVE_POINTER))
{
ecma_gc_free_native_pointer (property_p, (lit_magic_string_id_t) name_cp);
}
if (prop_iter_p->types[i] != ECMA_PROPERTY_TYPE_DELETED)
{
ecma_free_property (object_p, name_cp, property_p);
}
}
/* Both must be deleted. */
JERRY_ASSERT (prop_iter_p->types[0] == ECMA_PROPERTY_TYPE_DELETED
&& prop_iter_p->types[1] == ECMA_PROPERTY_TYPE_DELETED);
prop_iter_p = ECMA_GET_POINTER (ecma_property_header_t,
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)
{
/* The undefined id represents an uninitialized class. */
case LIT_MAGIC_STRING_UNDEFINED:
case LIT_MAGIC_STRING_ARGUMENTS_UL:
case LIT_MAGIC_STRING_BOOLEAN_UL:
case LIT_MAGIC_STRING_ERROR_UL:
{
break;
}
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 = ECMA_GET_INTERNAL_VALUE_POINTER (ecma_compiled_code_t,
ext_object_p->u.class_prop.u.value);
if (bytecode_p != NULL)
{
ecma_bytecode_deref (bytecode_p);
}
break;
}
#ifndef CONFIG_DISABLE_ES2015_TYPEDARRAY_BUILTIN
case LIT_MAGIC_STRING_ARRAY_BUFFER_UL:
{
ecma_length_t arraybuffer_length = ext_object_p->u.class_prop.u.length;
size_t size = sizeof (ecma_extended_object_t) + arraybuffer_length;
ecma_dealloc_extended_object ((ecma_extended_object_t *) object_p, size);
return;
}
#endif /* !CONFIG_DISABLE_ES2015_TYPEDARRAY_BUILTIN */
#ifndef CONFIG_DISABLE_ES2015_PROMISE_BUILTIN
case LIT_MAGIC_STRING_PROMISE_UL:
{
ecma_free_value_if_not_object (ext_object_p->u.class_prop.u.value);
ecma_free_values_collection (((ecma_promise_object_t *) object_p)->fulfill_reactions, false);
ecma_free_values_collection (((ecma_promise_object_t *) object_p)->reject_reactions, false);
ecma_dealloc_extended_object ((ecma_extended_object_t *) object_p, sizeof (ecma_promise_object_t));
return;
}
#endif /* !CONFIG_DISABLE_ES2015_PROMISE_BUILTIN */
default:
{
JERRY_UNREACHABLE ();
break;
}
}
ecma_dealloc_extended_object ((ecma_extended_object_t *) 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 ((ecma_extended_object_t *) 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;
ecma_bytecode_deref (ECMA_GET_INTERNAL_VALUE_POINTER (ecma_compiled_code_t,
ext_func_p->u.function.bytecode_cp));
ecma_dealloc_extended_object (ext_func_p, sizeof (ecma_extended_object_t));
return;
}
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)
{
case ECMA_PSEUDO_ARRAY_ARGUMENTS:
{
ecma_length_t formal_params_number = ext_object_p->u.pseudo_array.u1.length;
jmem_cpointer_t *arg_Literal_p = (jmem_cpointer_t *) (ext_object_p + 1);
for (ecma_length_t i = 0; i < formal_params_number; i++)
{
if (arg_Literal_p[i] != JMEM_CP_NULL)
{
ecma_string_t *name_p = JMEM_CP_GET_NON_NULL_POINTER (ecma_string_t, arg_Literal_p[i]);
ecma_deref_ecma_string (name_p);
}
}
size_t formal_params_size = formal_params_number * sizeof (jmem_cpointer_t);
ecma_dealloc_extended_object (ext_object_p, sizeof (ecma_extended_object_t) + formal_params_size);
return;
}
#ifndef CONFIG_DISABLE_ES2015_TYPEDARRAY_BUILTIN
case ECMA_PSEUDO_ARRAY_TYPEDARRAY:
{
ecma_dealloc_extended_object ((ecma_extended_object_t *) object_p,
sizeof (ecma_extended_object_t));
return;
}
case ECMA_PSEUDO_ARRAY_TYPEDARRAY_WITH_INFO:
{
ecma_dealloc_extended_object ((ecma_extended_object_t *) object_p,
sizeof (ecma_extended_typedarray_object_t));
return;
}
#endif /* !CONFIG_DISABLE_ES2015_TYPEDARRAY_BUILTIN */
default:
{
JERRY_UNREACHABLE ();
break;
}
}
JERRY_UNREACHABLE ();
}
if (object_type == ECMA_OBJECT_TYPE_BOUND_FUNCTION)
{
ecma_extended_object_t *ext_function_p = (ecma_extended_object_t *) object_p;
ecma_length_t args_length = ext_function_p->u.bound_function.args_length;
ecma_value_t *args_p = (ecma_value_t *) (ext_function_p + 1);
for (ecma_length_t i = 0; i < args_length; i++)
{
ecma_free_value_if_not_object (args_p[i]);
}
size_t args_size = args_length * sizeof (ecma_value_t);
ecma_dealloc_extended_object (ext_function_p, sizeof (ecma_extended_object_t) + args_size);
return;
}
}
ecma_dealloc_object (object_p);
} /* ecma_gc_sweep */
/**
* Run garbage collection
*/
void
ecma_gc_run (jmem_free_unused_memory_severity_t severity) /**< gc severity */
{
JERRY_CONTEXT (ecma_gc_new_objects) = 0;
JERRY_ASSERT (JERRY_CONTEXT (ecma_gc_objects_lists) [ECMA_GC_COLOR_BLACK] == NULL);
/* if some object is referenced from stack or globals (i.e. it is root), mark it */
for (ecma_object_t *obj_iter_p = JERRY_CONTEXT (ecma_gc_objects_lists) [ECMA_GC_COLOR_WHITE_GRAY];
obj_iter_p != NULL;
obj_iter_p = ecma_gc_get_object_next (obj_iter_p))
{
JERRY_ASSERT (!ecma_gc_is_object_visited (obj_iter_p));
if (obj_iter_p->type_flags_refs >= ECMA_OBJECT_REF_ONE)
{
ecma_gc_set_object_visited (obj_iter_p, true);
}
}
bool marked_anything_during_current_iteration = false;
do
{
marked_anything_during_current_iteration = false;
ecma_object_t *obj_prev_p = NULL;
ecma_object_t *obj_iter_p = JERRY_CONTEXT (ecma_gc_objects_lists) [ECMA_GC_COLOR_WHITE_GRAY];
while (obj_iter_p != NULL)
{
ecma_object_t *obj_next_p = ecma_gc_get_object_next (obj_iter_p);
if (ecma_gc_is_object_visited (obj_iter_p))
{
/* Moving the object to list of marked objects */
ecma_gc_set_object_next (obj_iter_p, JERRY_CONTEXT (ecma_gc_objects_lists) [ECMA_GC_COLOR_BLACK]);
JERRY_CONTEXT (ecma_gc_objects_lists) [ECMA_GC_COLOR_BLACK] = obj_iter_p;
if (likely (obj_prev_p != NULL))
{
JERRY_ASSERT (ecma_gc_get_object_next (obj_prev_p) == obj_iter_p);
ecma_gc_set_object_next (obj_prev_p, obj_next_p);
}
else
{
JERRY_CONTEXT (ecma_gc_objects_lists) [ECMA_GC_COLOR_WHITE_GRAY] = obj_next_p;
}
ecma_gc_mark (obj_iter_p);
marked_anything_during_current_iteration = true;
}
else
{
obj_prev_p = obj_iter_p;
}
obj_iter_p = obj_next_p;
}
}
while (marked_anything_during_current_iteration);
/* Sweeping objects that are currently unmarked */
ecma_object_t *obj_iter_p = JERRY_CONTEXT (ecma_gc_objects_lists) [ECMA_GC_COLOR_WHITE_GRAY];
while (obj_iter_p != NULL)
{
ecma_object_t *obj_next_p = ecma_gc_get_object_next (obj_iter_p);
JERRY_ASSERT (!ecma_gc_is_object_visited (obj_iter_p));
ecma_gc_sweep (obj_iter_p);
obj_iter_p = obj_next_p;
}
if (severity == JMEM_FREE_UNUSED_MEMORY_SEVERITY_HIGH)
{
/* Remove the property hashmap of BLACK objects */
obj_iter_p = JERRY_CONTEXT (ecma_gc_objects_lists) [ECMA_GC_COLOR_BLACK];
while (obj_iter_p != NULL)
{
JERRY_ASSERT (ecma_gc_is_object_visited (obj_iter_p));
if (!ecma_is_lexical_environment (obj_iter_p)
|| ecma_get_lex_env_type (obj_iter_p) == ECMA_LEXICAL_ENVIRONMENT_DECLARATIVE)
{
ecma_property_header_t *prop_iter_p = ecma_get_property_list (obj_iter_p);
if (prop_iter_p != NULL && prop_iter_p->types[0] == ECMA_PROPERTY_TYPE_HASHMAP)
{
ecma_property_hashmap_free (obj_iter_p);
}
}
obj_iter_p = ecma_gc_get_object_next (obj_iter_p);
}
}
/* Unmarking all objects */
ecma_object_t *black_objects = JERRY_CONTEXT (ecma_gc_objects_lists) [ECMA_GC_COLOR_BLACK];
JERRY_CONTEXT (ecma_gc_objects_lists)[ECMA_GC_COLOR_WHITE_GRAY] = black_objects;
JERRY_CONTEXT (ecma_gc_objects_lists) [ECMA_GC_COLOR_BLACK] = NULL;
JERRY_CONTEXT (ecma_gc_visited_flip_flag) = !JERRY_CONTEXT (ecma_gc_visited_flip_flag);
#ifndef CONFIG_DISABLE_REGEXP_BUILTIN
/* Free RegExp bytecodes stored in cache */
re_cache_gc_run ();
#endif /* !CONFIG_DISABLE_REGEXP_BUILTIN */
} /* ecma_gc_run */
/**
* Try to free some memory (depending on severity).
*/
void
ecma_free_unused_memory (jmem_free_unused_memory_severity_t severity) /**< severity of the request */
{
#ifdef 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 ();
}
#endif /* JERRY_DEBUGGER */
if (severity == JMEM_FREE_UNUSED_MEMORY_SEVERITY_LOW)
{
#ifndef CONFIG_ECMA_PROPERTY_HASHMAP_DISABLE
if (JERRY_CONTEXT (ecma_prop_hashmap_alloc_state) > ECMA_PROP_HASHMAP_ALLOC_ON)
{
--JERRY_CONTEXT (ecma_prop_hashmap_alloc_state);
}
JERRY_CONTEXT (ecma_prop_hashmap_alloc_last_is_hs_gc) = false;
#endif /* !CONFIG_ECMA_PROPERTY_HASHMAP_DISABLE */
/*
* 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_share = CONFIG_ECMA_GC_NEW_OBJECTS_SHARE_TO_START_GC;
if (JERRY_CONTEXT (ecma_gc_new_objects) * new_objects_share > JERRY_CONTEXT (ecma_gc_objects_number))
{
ecma_gc_run (severity);
}
}
else
{
JERRY_ASSERT (severity == JMEM_FREE_UNUSED_MEMORY_SEVERITY_HIGH);
#ifndef CONFIG_ECMA_PROPERTY_HASHMAP_DISABLE
if (JERRY_CONTEXT (ecma_prop_hashmap_alloc_last_is_hs_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 (ecma_prop_hashmap_alloc_last_is_hs_gc) = true;
}
#endif /* !CONFIG_ECMA_PROPERTY_HASHMAP_DISABLE */
/* Freeing as much memory as we currently can */
ecma_gc_run (severity);
}
} /* ecma_free_unused_memory */
/**
* @}
* @}
*/
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