C++ JERRY_CONTEXT函数代码示例

/**
 * Send memory statistics to the debugger client.
 */
void
jerry_debugger_send_memstats (void)
{
  JERRY_ASSERT (JERRY_CONTEXT (debugger_flags) & JERRY_DEBUGGER_CONNECTED);

  JERRY_DEBUGGER_SEND_BUFFER_AS (jerry_debugger_send_memstats_t, memstats_p);

  memstats_p->type = JERRY_DEBUGGER_MEMSTATS_RECEIVE;

#ifdef JMEM_STATS /* if jmem_stats are defined */
  jmem_heap_stats_t *heap_stats = &JERRY_CONTEXT (jmem_heap_stats);

  uint32_t allocated_bytes = (uint32_t) heap_stats->allocated_bytes;
  memcpy (memstats_p->allocated_bytes, &allocated_bytes, sizeof (uint32_t));
  uint32_t byte_code_bytes = (uint32_t) heap_stats->byte_code_bytes;
  memcpy (memstats_p->byte_code_bytes, &byte_code_bytes, sizeof (uint32_t));
  uint32_t string_bytes = (uint32_t) heap_stats->string_bytes;
  memcpy (memstats_p->string_bytes, &string_bytes, sizeof (uint32_t));
  uint32_t object_bytes = (uint32_t) heap_stats->object_bytes;
  memcpy (memstats_p->object_bytes, &object_bytes, sizeof (uint32_t));
  uint32_t property_bytes = (uint32_t) heap_stats->property_bytes;
  memcpy (memstats_p->property_bytes, &property_bytes, sizeof (uint32_t));
#else /* if not, just put zeros */
  memset (memstats_p->allocated_bytes, 0, sizeof (uint32_t));
  memset (memstats_p->byte_code_bytes, 0, sizeof (uint32_t));
  memset (memstats_p->string_bytes, 0, sizeof (uint32_t));
  memset (memstats_p->object_bytes, 0, sizeof (uint32_t));
  memset (memstats_p->property_bytes, 0, sizeof (uint32_t));
#endif

  jerry_debugger_send (sizeof (jerry_debugger_send_memstats_t));
} /* jerry_debugger_send_memstats */

/**
 * Check whether currently executed code is strict mode code
 *
 * @return true - current code is executed in strict mode,
 *         false - otherwise
 */
bool
vm_is_strict_mode (void)
{
  JERRY_ASSERT (JERRY_CONTEXT (vm_top_context_p) != NULL);

  return JERRY_CONTEXT (vm_top_context_p)->bytecode_header_p->status_flags & CBC_CODE_FLAGS_STRICT_MODE;
} /* vm_is_strict_mode */

/**
 *  Collect empty pool chunks
 */
void
jmem_pools_collect_empty ()
{
  jmem_pools_chunk_t *chunk_p = JERRY_CONTEXT (jmem_free_8_byte_chunk_p);
  JERRY_CONTEXT (jmem_free_8_byte_chunk_p) = NULL;

  while (chunk_p)
  {
    VALGRIND_DEFINED_SPACE (chunk_p, sizeof (jmem_pools_chunk_t));
    jmem_pools_chunk_t *const next_p = chunk_p->next_p;
    VALGRIND_NOACCESS_SPACE (chunk_p, sizeof (jmem_pools_chunk_t));

    jmem_heap_free_block (chunk_p, 8);
    JMEM_POOLS_STAT_DEALLOC ();
    chunk_p = next_p;
  }

#ifdef JERRY_CPOINTER_32_BIT
  chunk_p = JERRY_CONTEXT (jmem_free_16_byte_chunk_p);
  JERRY_CONTEXT (jmem_free_16_byte_chunk_p) = NULL;

  while (chunk_p)
  {
    VALGRIND_DEFINED_SPACE (chunk_p, sizeof (jmem_pools_chunk_t));
    jmem_pools_chunk_t *const next_p = chunk_p->next_p;
    VALGRIND_NOACCESS_SPACE (chunk_p, sizeof (jmem_pools_chunk_t));

    jmem_heap_free_block (chunk_p, 16);
    JMEM_POOLS_STAT_DEALLOC ();
    chunk_p = next_p;
  }
#endif /* JERRY_CPOINTER_32_BIT */
} /* jmem_pools_collect_empty */

/**
 * Free the chunk
 */
inline void __attr_hot___ __attr_always_inline___
jmem_pools_free (void *chunk_p, /**< pointer to the chunk */
                 size_t size) /**< size of the chunk */
{
  JERRY_ASSERT (chunk_p != NULL);

  jmem_pools_chunk_t *const chunk_to_free_p = (jmem_pools_chunk_t *) chunk_p;

  VALGRIND_DEFINED_SPACE (chunk_to_free_p, size);

  if (size <= 8)
  {
    chunk_to_free_p->next_p = JERRY_CONTEXT (jmem_free_8_byte_chunk_p);
    JERRY_CONTEXT (jmem_free_8_byte_chunk_p) = chunk_to_free_p;
  }
  else
  {
#ifdef JERRY_CPOINTER_32_BIT
    JERRY_ASSERT (size <= 16);

    chunk_to_free_p->next_p = JERRY_CONTEXT (jmem_free_16_byte_chunk_p);
    JERRY_CONTEXT (jmem_free_16_byte_chunk_p) = chunk_to_free_p;
#else /* !JERRY_CPOINTER_32_BIT */
    JERRY_UNREACHABLE ();
#endif /* JERRY_CPOINTER_32_BIT */
  }

  VALGRIND_NOACCESS_SPACE (chunk_to_free_p, size);

  JMEM_POOLS_STAT_FREE_POOL ();
} /* jmem_pools_free */

/**
 * Allocate a chunk of specified size
 *
 * @return pointer to allocated chunk, if allocation was successful,
 *         or NULL - if not enough memory.
 */
inline void * __attribute__((hot)) __attr_always_inline___
jmem_pools_alloc (void)
{
#ifdef JMEM_GC_BEFORE_EACH_ALLOC
  jmem_run_free_unused_memory_callbacks (JMEM_FREE_UNUSED_MEMORY_SEVERITY_HIGH);
#endif /* JMEM_GC_BEFORE_EACH_ALLOC */

  if (JERRY_CONTEXT (jmem_free_chunk_p) != NULL)
  {
    const jmem_pools_chunk_t *const chunk_p = JERRY_CONTEXT (jmem_free_chunk_p);

    JMEM_POOLS_STAT_REUSE ();

    VALGRIND_DEFINED_SPACE (chunk_p, JMEM_POOL_CHUNK_SIZE);

    JERRY_CONTEXT (jmem_free_chunk_p) = chunk_p->next_p;

    VALGRIND_UNDEFINED_SPACE (chunk_p, JMEM_POOL_CHUNK_SIZE);

    return (void *) chunk_p;
  }
  else
  {
    JMEM_POOLS_STAT_NEW_ALLOC ();
    return (void *) jmem_heap_alloc_block (JMEM_POOL_CHUNK_SIZE);
  }
} /* jmem_pools_alloc */

/**
 * Startup initialization of heap
 */
void
jmem_heap_init (void)
{
#ifndef JERRY_CPOINTER_32_BIT
  JERRY_STATIC_ASSERT (((UINT16_MAX + 1) << JMEM_ALIGNMENT_LOG) >= JMEM_HEAP_SIZE,
                       maximum_heap_size_for_16_bit_compressed_pointers_is_512K);
#endif /* !JERRY_CPOINTER_32_BIT */

  JERRY_ASSERT ((uintptr_t) JERRY_HEAP_CONTEXT (area) % JMEM_ALIGNMENT == 0);

  JERRY_CONTEXT (jmem_heap_limit) = CONFIG_MEM_HEAP_DESIRED_LIMIT;

  jmem_heap_free_t *const region_p = (jmem_heap_free_t *) JERRY_HEAP_CONTEXT (area);

  region_p->size = JMEM_HEAP_AREA_SIZE;
  region_p->next_offset = JMEM_HEAP_END_OF_LIST;

  JERRY_HEAP_CONTEXT (first).size = 0;
  JERRY_HEAP_CONTEXT (first).next_offset = JMEM_HEAP_GET_OFFSET_FROM_ADDR (region_p);

  JERRY_CONTEXT (jmem_heap_list_skip_p) = &JERRY_HEAP_CONTEXT (first);

  VALGRIND_NOACCESS_SPACE (JERRY_HEAP_CONTEXT (area), JMEM_HEAP_AREA_SIZE);

  JMEM_HEAP_STAT_INIT ();
} /* jmem_heap_init */

/**
 * Unregister specified 'try to give memory back' callback routine
 */
void
jmem_unregister_free_unused_memory_callback (jmem_free_unused_memory_callback_t callback) /**< callback routine */
{
  /* Currently only one callback is supported */
  JERRY_ASSERT (JERRY_CONTEXT (jmem_free_unused_memory_callback) == callback);

  JERRY_CONTEXT (jmem_free_unused_memory_callback) = NULL;
} /* jmem_unregister_free_unused_memory_callback */

/**
 * Finalize pool manager
 */
void
jmem_pools_finalize (void)
{
  jmem_pools_collect_empty ();

  JERRY_ASSERT (JERRY_CONTEXT (jmem_free_8_byte_chunk_p) == NULL);
#ifdef JERRY_CPOINTER_32_BIT
  JERRY_ASSERT (JERRY_CONTEXT (jmem_free_16_byte_chunk_p) == NULL);
#endif /* JERRY_CPOINTER_32_BIT */
} /* jmem_pools_finalize */

/**
 * Run 'try to give memory back' callbacks with specified severity
 */
void
jmem_run_free_unused_memory_callbacks (jmem_free_unused_memory_severity_t severity) /**< severity of the request */
{
  if (JERRY_CONTEXT (jmem_free_unused_memory_callback) != NULL)
  {
    JERRY_CONTEXT (jmem_free_unused_memory_callback) (severity);
  }

  jmem_pools_collect_empty ();
} /* jmem_run_free_unused_memory_callbacks */

/**
 * Continue execution.
 */
void
jerry_debugger_continue (void)
{
#ifdef JERRY_DEBUGGER
  if ((JERRY_CONTEXT (debugger_flags) & JERRY_DEBUGGER_CONNECTED)
      && !(JERRY_CONTEXT (debugger_flags) & JERRY_DEBUGGER_BREAKPOINT_MODE))
  {
    JERRY_DEBUGGER_CLEAR_FLAGS (JERRY_DEBUGGER_VM_STOP);
    JERRY_CONTEXT (debugger_stop_context) = NULL;
  }
#endif /* JERRY_DEBUGGER */
} /* jerry_debugger_continue */

/**
 * Allocation of memory block, running 'try to give memory back' callbacks, if there is not enough memory.
 *
 * Note:
 *      if there is still not enough memory after running the callbacks
 *        - NULL value will be returned if parmeter 'ret_null_on_error' is true
 *        - the engine will terminate with ERR_OUT_OF_MEMORY if 'ret_null_on_error' is false
 *
 * @return NULL, if the required memory size is 0
 *         also NULL, if 'ret_null_on_error' is true and the allocation fails because of there is not enough memory
 */
static void *
jmem_heap_gc_and_alloc_block (const size_t size,      /**< required memory size */
                              bool ret_null_on_error) /**< indicates whether return null or terminate
                                                           with ERR_OUT_OF_MEMORY on out of memory */
{
  if (unlikely (size == 0))
  {
    return NULL;
  }

  VALGRIND_FREYA_CHECK_MEMPOOL_REQUEST;

#ifdef JMEM_GC_BEFORE_EACH_ALLOC
  jmem_run_free_unused_memory_callbacks (JMEM_FREE_UNUSED_MEMORY_SEVERITY_HIGH);
#endif /* JMEM_GC_BEFORE_EACH_ALLOC */

  if (JERRY_CONTEXT (jmem_heap_allocated_size) + size >= JERRY_CONTEXT (jmem_heap_limit))
  {
    jmem_run_free_unused_memory_callbacks (JMEM_FREE_UNUSED_MEMORY_SEVERITY_LOW);
  }

  void *data_space_p = jmem_heap_alloc_block_internal (size);

  if (likely (data_space_p != NULL))
  {
    VALGRIND_FREYA_MALLOCLIKE_SPACE (data_space_p, size);
    return data_space_p;
  }

  for (jmem_free_unused_memory_severity_t severity = JMEM_FREE_UNUSED_MEMORY_SEVERITY_LOW;
       severity <= JMEM_FREE_UNUSED_MEMORY_SEVERITY_HIGH;
       severity = (jmem_free_unused_memory_severity_t) (severity + 1))
  {
    jmem_run_free_unused_memory_callbacks (severity);

    data_space_p = jmem_heap_alloc_block_internal (size);

    if (likely (data_space_p != NULL))
    {
      VALGRIND_FREYA_MALLOCLIKE_SPACE (data_space_p, size);
      return data_space_p;
    }
  }

  JERRY_ASSERT (data_space_p == NULL);

  if (!ret_null_on_error)
  {
    jerry_fatal (ERR_OUT_OF_MEMORY);
  }

  return data_space_p;
} /* jmem_heap_gc_and_alloc_block */

jmem_pools_free (void *chunk_p) /**< pointer to the chunk */
{
  jmem_pools_chunk_t *const chunk_to_free_p = (jmem_pools_chunk_t *) chunk_p;

  VALGRIND_DEFINED_SPACE (chunk_to_free_p, JMEM_POOL_CHUNK_SIZE);

  chunk_to_free_p->next_p = JERRY_CONTEXT (jmem_free_chunk_p);
  JERRY_CONTEXT (jmem_free_chunk_p) = chunk_to_free_p;

  VALGRIND_NOACCESS_SPACE (chunk_to_free_p, JMEM_POOL_CHUNK_SIZE);

  JMEM_POOLS_STAT_FREE_POOL ();
} /* jmem_pools_free */

/**
 * Finalize ECMA built-in objects
 */
void
ecma_finalize_builtins (void)
{
  for (ecma_builtin_id_t id = (ecma_builtin_id_t) 0;
       id < ECMA_BUILTIN_ID__COUNT;
       id = (ecma_builtin_id_t) (id + 1))
  {
    if (JERRY_CONTEXT (ecma_builtin_objects)[id] != NULL)
    {
      ecma_deref_object (JERRY_CONTEXT (ecma_builtin_objects)[id]);
      JERRY_CONTEXT (ecma_builtin_objects)[id] = NULL;
    }
  }
} /* ecma_finalize_builtins */

/**
 * Get reference to specified built-in object
 *
 * @return pointer to the object's instance
 */
ecma_object_t *
ecma_builtin_get (ecma_builtin_id_t builtin_id) /**< id of built-in to check on */
{
  JERRY_ASSERT (builtin_id < ECMA_BUILTIN_ID__COUNT);

  if (unlikely (JERRY_CONTEXT (ecma_builtin_objects)[builtin_id] == NULL))
  {
    ecma_instantiate_builtin (builtin_id);
  }

  ecma_ref_object (JERRY_CONTEXT (ecma_builtin_objects)[builtin_id]);

  return JERRY_CONTEXT (ecma_builtin_objects)[builtin_id];
} /* ecma_builtin_get */

/**
 * Send backtrace.
 */
static void
jerry_debugger_send_backtrace (uint8_t *recv_buffer_p) /**< pointer to the received data */
{
  JERRY_DEBUGGER_RECEIVE_BUFFER_AS (jerry_debugger_receive_get_backtrace_t, get_backtrace_p);

  uint32_t max_depth;
  memcpy (&max_depth, get_backtrace_p->max_depth, sizeof (uint32_t));

  if (max_depth == 0)
  {
    max_depth = UINT32_MAX;
  }

  JERRY_DEBUGGER_SEND_BUFFER_AS (jerry_debugger_send_backtrace_t, backtrace_p);

  backtrace_p->type = JERRY_DEBUGGER_BACKTRACE;

  vm_frame_ctx_t *frame_ctx_p = JERRY_CONTEXT (vm_top_context_p);

  size_t current_frame = 0;
  const size_t max_frame_count = JERRY_DEBUGGER_SEND_MAX (jerry_debugger_frame_t);
  const size_t max_message_size = JERRY_DEBUGGER_SEND_SIZE (max_frame_count, jerry_debugger_frame_t);

  while (frame_ctx_p != NULL && max_depth > 0)
  {
    if (frame_ctx_p->bytecode_header_p->status_flags & CBC_CODE_FLAGS_DEBUGGER_IGNORE)
    {
      frame_ctx_p = frame_ctx_p->prev_context_p;
      continue;
    }

    if (current_frame >= max_frame_count)
    {
      if (!jerry_debugger_send (max_message_size))
      {
        return;
      }
      current_frame = 0;
    }

    jerry_debugger_frame_t *frame_p = backtrace_p->frames + current_frame;

    jmem_cpointer_t byte_code_cp;
    JMEM_CP_SET_NON_NULL_POINTER (byte_code_cp, frame_ctx_p->bytecode_header_p);
    memcpy (frame_p->byte_code_cp, &byte_code_cp, sizeof (jmem_cpointer_t));

    uint32_t offset = (uint32_t) (frame_ctx_p->byte_code_p - (uint8_t *) frame_ctx_p->bytecode_header_p);
    memcpy (frame_p->offset, &offset, sizeof (uint32_t));

    frame_ctx_p = frame_ctx_p->prev_context_p;
    current_frame++;
    max_depth--;
  }

  size_t message_size = current_frame * sizeof (jerry_debugger_frame_t);

  backtrace_p->type = JERRY_DEBUGGER_BACKTRACE_END;

  jerry_debugger_send (sizeof (jerry_debugger_send_type_t) + message_size);
} /* jerry_debugger_send_backtrace */