text: /*
     +----------------------------------------------------------------------+
     | Zend Engine                                                          |
     +----------------------------------------------------------------------+
     | Copyright (c) 1998-2016 Zend Technologies Ltd. (http://www.zend.com) |
     +----------------------------------------------------------------------+
     | This source file is subject to version 2.00 of the Zend license,     |
     | that is bundled with this package in the file LICENSE, and is        |
     | available through the world-wide-web at the following url:           |
     | http://www.zend.com/license/2_00.txt.                                |
     | If you did not receive a copy of the Zend license and are unable to  |
     | obtain it through the world-wide-web, please send a note to          |
     | license@zend.com so we can mail you a copy immediately.              |
     +----------------------------------------------------------------------+
     | Authors: Andi Gutmans <andi@zend.com>                                |
     +----------------------------------------------------------------------+
  */
  
  /* $Id$ */
  
  #include "zend_static_allocator.h"
  /* 该文件中的函数未见使用 */
  /* Not checking emalloc() and erealloc() return values as they are supposed to bailout */
  
  inline static void block_init(Block *block, zend_uint block_size)/* 初始化一个大小为block_size的块 */
  {
  	block->pos = block->bp = (char *) emalloc(block_size);/* 申请一个block_size内存 */
  	block->end = block->bp + block_size;/* 将块的end的指针指向最后 */
  }
  
  inline static char *block_allocate(Block *block, zend_uint size)
  {
  	char *retval = block->pos;
  	if ((block->pos += size) >= block->end) {
  		return (char *)NULL;
  	}
  	return retval;
  }
  
  inline static void block_destroy(Block *block)/* 释放块内存 */
  {
  	efree(block->bp);
  }
  
  void static_allocator_init(StaticAllocator *sa)/* 静态分配器初始化,申请一个块 */
  {
  	sa->Blocks = (Block *) emalloc(sizeof(Block));
  	block_init(sa->Blocks, ALLOCATOR_BLOCK_SIZE);/* ALLOCATOR_BLOCK_SIZE为400000字节,大约390kb */
  	sa->num_blocks = 1;
  	sa->current_block = 0;
  }
  
  char *static_allocator_allocate(StaticAllocator *sa, zend_uint size)/* 静态分配器分配一个块 */
  {
  	char *retval;
  
  	retval = block_allocate(&sa->Blocks[sa->current_block], size);
  	if (retval) {
  		return retval;
  	}
  	sa->Blocks = (Block *) erealloc(sa->Blocks, ++sa->num_blocks);
  	sa->current_block++;
  	block_init(&sa->Blocks[sa->current_block], (size > ALLOCATOR_BLOCK_SIZE) ? size : ALLOCATOR_BLOCK_SIZE);
  	retval = block_allocate(&sa->Blocks[sa->current_block], size);
  	return retval;
  }
  
  void static_allocator_destroy(StaticAllocator *sa)/* 释放静态分配器中的所有块 */
  {
  	zend_uint i;
  
  	for (i=0; i<sa->num_blocks; i++) {
  		block_free(&sa->Blocks[i]);
  	}
  	efree(sa->Blocks);
  }
  
  /*
   * Local variables:
   * tab-width: 4
   * c-basic-offset: 4
   * indent-tabs-mode: t
   * End:
   */
  