Zoltan Herczeg
3a78d30897
Currently the static variables of the allocator are moved into a global structure. The future plan is supporting multiple context models with different advantages and disadvantages. Users can select the most appropriate context model for their own use case. This context model must be selected at compile time using compiler defines. Currently only one model is implemented, which will be the default context model: the context is stored in global variables, so only a single context is available which always exists. JerryScript-DCO-1.0-Signed-off-by: Zoltan Herczeg zherczeg.u-szeged@partner.samsung.com
112 lines
3.2 KiB
C
112 lines
3.2 KiB
C
/* Copyright 2016 Samsung Electronics Co., Ltd.
|
|
* Copyright 2016 University of Szeged.
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
/**
|
|
* Memory context for JerryScript
|
|
*/
|
|
#ifndef JCONTEXT_H
|
|
#define JCONTEXT_H
|
|
|
|
#include "jrt.h"
|
|
#include "jmem-allocator.h"
|
|
#include "jmem-config.h"
|
|
|
|
/** \addtogroup context Jerry context
|
|
* @{
|
|
*
|
|
* \addtogroup context Context
|
|
* @{
|
|
*/
|
|
|
|
/**
|
|
* Calculate heap area size, leaving space for a pointer to the free list
|
|
*/
|
|
#define JMEM_HEAP_AREA_SIZE (JMEM_HEAP_SIZE - JMEM_ALIGNMENT)
|
|
|
|
/**
|
|
* Heap structure
|
|
*
|
|
* Memory blocks returned by the allocator must not start from the
|
|
* beginning of the heap area because offset 0 is reserved for
|
|
* JMEM_CP_NULL. This special constant is used in several places,
|
|
* e.g. it marks the end of the property chain list, so it cannot
|
|
* be eliminated from the project. Although the allocator cannot
|
|
* use the first 8 bytes of the heap, nothing prevents to use it
|
|
* for other purposes. Currently the free region start is stored
|
|
* there.
|
|
*/
|
|
typedef struct
|
|
{
|
|
jmem_heap_free_t first; /**< first node in free region list */
|
|
uint8_t area[JMEM_HEAP_AREA_SIZE]; /**< heap area */
|
|
} jmem_heap_t;
|
|
|
|
/**
|
|
* JerryScript context
|
|
*
|
|
* The purpose of this header is storing
|
|
* all global variables for Jerry
|
|
*/
|
|
typedef struct
|
|
{
|
|
/**
|
|
* Memory manager part.
|
|
*/
|
|
size_t jmem_heap_allocated_size; /**< size of allocated regions */
|
|
size_t jmem_heap_limit; /**< current limit of heap usage, that is upon being reached,
|
|
* causes call of "try give memory back" callbacks */
|
|
jmem_heap_free_t *jmem_heap_list_skip_p; /**< This is used to speed up deallocation. */
|
|
jmem_pools_chunk_t *jmem_free_chunk_p; /**< list of free pool chunks */
|
|
jmem_free_unused_memory_callback_t jmem_free_unused_memory_callback; /**< Callback for freeing up memory. */
|
|
|
|
#ifdef JMEM_STATS
|
|
jmem_heap_stats_t jmem_heap_stats; /**< heap's memory usage statistics */
|
|
jmem_pools_stats_t jmem_pools_stats; /**< pools' memory usage statistics */
|
|
#endif /* MEM_STATS */
|
|
|
|
#ifdef JERRY_VALGRIND_FREYA
|
|
bool valgrind_freya_mempool_request; /**< Tells whether a pool manager
|
|
* allocator request is in progress */
|
|
#endif /* JERRY_VALGRIND_FREYA */
|
|
} jerry_context_t;
|
|
|
|
/**
|
|
* Jerry global context.
|
|
*/
|
|
extern jerry_context_t jerry_global_context;
|
|
|
|
/**
|
|
* Jerry global heap.
|
|
*/
|
|
extern jmem_heap_t jerry_global_heap;
|
|
|
|
/**
|
|
* Provides a reference to a field in the current context.
|
|
*/
|
|
#define JERRY_CONTEXT(field) (jerry_global_context.field)
|
|
|
|
/**
|
|
* Provides a reference to the area field of the heap.
|
|
*/
|
|
#define JERRY_HEAP_CONTEXT(field) (jerry_global_heap.field)
|
|
|
|
/**
|
|
* @}
|
|
* @}
|
|
*/
|
|
|
|
#endif /* !JCONTEXT_H */
|