text: /*
     +----------------------------------------------------------------------+
     | Zend Engine                                                          |
     +----------------------------------------------------------------------+
     | Copyright (c) 1998-2018 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>                                |
     |          Zeev Suraski <zeev@zend.com>                                |
     +----------------------------------------------------------------------+
  */
  
  /* $Id$ */
  
  #ifndef ZEND_PTR_STACK_H
  #define ZEND_PTR_STACK_H
  
  typedef struct _zend_ptr_stack {
  	int top, max;
  	void **elements;
  	void **top_element;
  	zend_bool persistent;
  } zend_ptr_stack;
  
  
  #define PTR_STACK_BLOCK_SIZE 64
  
  BEGIN_EXTERN_C()
  ZEND_API void zend_ptr_stack_init(zend_ptr_stack *stack);
  ZEND_API void zend_ptr_stack_init_ex(zend_ptr_stack *stack, zend_bool persistent);
  ZEND_API void zend_ptr_stack_n_push(zend_ptr_stack *stack, int count, ...);
  ZEND_API void zend_ptr_stack_n_pop(zend_ptr_stack *stack, int count, ...);
  ZEND_API void zend_ptr_stack_destroy(zend_ptr_stack *stack);
  ZEND_API void zend_ptr_stack_apply(zend_ptr_stack *stack, void (*func)(void *));
  ZEND_API void zend_ptr_stack_clean(zend_ptr_stack *stack, void (*func)(void *), zend_bool free_elements);
  ZEND_API int zend_ptr_stack_num_elements(zend_ptr_stack *stack);
  END_EXTERN_C()
  
  #define ZEND_PTR_STACK_RESIZE_IF_NEEDED(stack, count)		\
  	if (stack->top+count > stack->max) {					\
  		/* we need to allocate more memory */				\
  		do {												\
  			stack->max += PTR_STACK_BLOCK_SIZE;				\
  		} while (stack->top+count > stack->max);			\
  		stack->elements = (void **) perealloc(stack->elements, (sizeof(void *) * (stack->max)), stack->persistent);	\
  		stack->top_element = stack->elements+stack->top;	\
  	}
  
  /*	Not doing this with a macro because of the loop unrolling in the element assignment.
  	Just using a macro for 3 in the body for readability sake. */
  static zend_always_inline void zend_ptr_stack_3_push(zend_ptr_stack *stack, void *a, void *b, void *c)
  {
  #define ZEND_PTR_STACK_NUM_ARGS 3
  
  	ZEND_PTR_STACK_RESIZE_IF_NEEDED(stack, ZEND_PTR_STACK_NUM_ARGS)
  
  	stack->top += ZEND_PTR_STACK_NUM_ARGS;
  	*(stack->top_element++) = a;
  	*(stack->top_element++) = b;
  	*(stack->top_element++) = c;
  
  #undef ZEND_PTR_STACK_NUM_ARGS
  }
  
  static zend_always_inline void zend_ptr_stack_2_push(zend_ptr_stack *stack, void *a, void *b)
  {
  #define ZEND_PTR_STACK_NUM_ARGS 2
  
  	ZEND_PTR_STACK_RESIZE_IF_NEEDED(stack, ZEND_PTR_STACK_NUM_ARGS)
  
  	stack->top += ZEND_PTR_STACK_NUM_ARGS;
  	*(stack->top_element++) = a;
  	*(stack->top_element++) = b;
  
  #undef ZEND_PTR_STACK_NUM_ARGS
  }
  
  static zend_always_inline void zend_ptr_stack_3_pop(zend_ptr_stack *stack, void **a, void **b, void **c)
  {
  	*a = *(--stack->top_element);
  	*b = *(--stack->top_element);
  	*c = *(--stack->top_element);
  	stack->top -= 3;
  }
  
  static zend_always_inline void zend_ptr_stack_2_pop(zend_ptr_stack *stack, void **a, void **b)
  {
  	*a = *(--stack->top_element);
  	*b = *(--stack->top_element);
  	stack->top -= 2;
  }
  
  static zend_always_inline void zend_ptr_stack_push(zend_ptr_stack *stack, void *ptr)
  {
  	ZEND_PTR_STACK_RESIZE_IF_NEEDED(stack, 1)
  
  	stack->top++;
  	*(stack->top_element++) = ptr;
  }
  
  static zend_always_inline void *zend_ptr_stack_pop(zend_ptr_stack *stack)
  {
  	stack->top--;
  	return *(--stack->top_element);
  }
  
  static zend_always_inline void *zend_ptr_stack_top(zend_ptr_stack *stack)
  {
      return stack->elements[stack->top - 1];
  }
  
  #endif /* ZEND_PTR_STACK_H */
  
  /*
   * Local variables:
   * tab-width: 4
   * c-basic-offset: 4
   * indent-tabs-mode: t
   * End:
   */
  