Ruben Ayrapetyan
148 lines
3.7 KiB
C
148 lines
3.7 KiB
C
/* Copyright 2014 Samsung Electronics Co., Ltd.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/** \addtogroup ecma ---TODO---
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* @{
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*
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* \addtogroup ecmagc Garbage collector
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* @{
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*/
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/**
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* Garbage collector implementation
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*/
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#include "globals.h"
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#include "ecma-alloc.h"
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#include "ecma-globals.h"
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#include "ecma-gc.h"
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#include "ecma-helpers.h"
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/**
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* Queue of objects, awaiting for GC
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*/
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static ecma_object_t *ecma_gc_objs_to_free_queue;
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/**
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* Queue object for GC.
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*
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* Warning:
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* After this operation the object is not longer valid for general use.
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*/
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static void
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ecma_gc_queue( ecma_object_t *object_p) /**< object */
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{
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JERRY_ASSERT( object_p != NULL );
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JERRY_ASSERT( object_p->GCInfo.is_object_valid );
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JERRY_ASSERT( object_p->GCInfo.u.refs == 0 );
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object_p->GCInfo.is_object_valid = false;
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ecma_set_pointer( object_p->GCInfo.u.next_queued_for_gc, ecma_gc_objs_to_free_queue);
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ecma_gc_objs_to_free_queue = object_p;
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} /* ecma_gc_queue */
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/**
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* Increase reference counter of an object
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*/
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void
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ecma_ref_object(ecma_object_t *object_p) /**< object */
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{
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JERRY_ASSERT(object_p->GCInfo.is_object_valid);
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object_p->GCInfo.u.refs++;
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/**
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* Check that value was not overflowed
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*/
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JERRY_ASSERT(object_p->GCInfo.u.refs > 0);
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} /* ecma_ref_object */
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/**
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* Decrease reference counter of an object
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*/
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void
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ecma_deref_object(ecma_object_t *object_p) /**< object */
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{
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JERRY_ASSERT(object_p != NULL);
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JERRY_ASSERT(object_p->GCInfo.is_object_valid);
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JERRY_ASSERT(object_p->GCInfo.u.refs > 0);
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object_p->GCInfo.u.refs--;
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if ( object_p->GCInfo.u.refs == 0 )
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{
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ecma_gc_queue( object_p);
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}
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} /* ecma_deref_object */
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/**
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* Initialize garbage collector
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*/
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void
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ecma_gc_init( void)
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{
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ecma_gc_objs_to_free_queue = NULL;
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} /* ecma_gc_init */
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/**
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* Run garbage collecting
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*/
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void
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ecma_gc_run( void)
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{
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while ( ecma_gc_objs_to_free_queue != NULL )
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{
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ecma_object_t *object_p = ecma_gc_objs_to_free_queue;
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ecma_gc_objs_to_free_queue = ecma_get_pointer( object_p->GCInfo.u.next_queued_for_gc);
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JERRY_ASSERT( !object_p->GCInfo.is_object_valid );
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for ( ecma_property_t *property = ecma_get_pointer( object_p->properties_p), *next_property_p;
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property != NULL;
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property = next_property_p )
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{
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next_property_p = ecma_get_pointer( property->next_property_p);
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ecma_free_property( property);
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}
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if ( object_p->is_lexical_environment )
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{
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ecma_object_t *outer_lexical_environment_p = ecma_get_pointer( object_p->u.lexical_environment.outer_reference_p);
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if ( outer_lexical_environment_p != NULL )
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{
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ecma_deref_object( outer_lexical_environment_p);
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}
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} else
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{
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ecma_object_t *prototype_object_p = ecma_get_pointer( object_p->u.object.prototype_object_p);
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if ( prototype_object_p != NULL )
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{
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ecma_deref_object( prototype_object_p);
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}
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}
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ecma_dealloc_object( object_p);
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}
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} /* ecma_gc_run */
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/**
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* @}
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* @}
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*/
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