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/*
+----------------------------------------------------------------------+
| Zend Engine |
+----------------------------------------------------------------------+
| Copyright (c) 1998-2012 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);
}

#endif /* ZEND_PTR_STACK_H */

/*
* Local variables:
* tab-width: 4
* c-basic-offset: 4
* indent-tabs-mode: t
* End:
*/
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