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Annotation of embedaddon/php/Zend/zend_ptr_stack.h, revision 1.1.1.1

1.1       misho       1: /*
                      2:    +----------------------------------------------------------------------+
                      3:    | Zend Engine                                                          |
                      4:    +----------------------------------------------------------------------+
                      5:    | Copyright (c) 1998-2012 Zend Technologies Ltd. (http://www.zend.com) |
                      6:    +----------------------------------------------------------------------+
                      7:    | This source file is subject to version 2.00 of the Zend license,     |
                      8:    | that is bundled with this package in the file LICENSE, and is        | 
                      9:    | available through the world-wide-web at the following url:           |
                     10:    | http://www.zend.com/license/2_00.txt.                                |
                     11:    | If you did not receive a copy of the Zend license and are unable to  |
                     12:    | obtain it through the world-wide-web, please send a note to          |
                     13:    | license@zend.com so we can mail you a copy immediately.              |
                     14:    +----------------------------------------------------------------------+
                     15:    | Authors: Andi Gutmans <andi@zend.com>                                |
                     16:    |          Zeev Suraski <zeev@zend.com>                                |
                     17:    +----------------------------------------------------------------------+
                     18: */
                     19: 
                     20: /* $Id: zend_ptr_stack.h 321634 2012-01-01 13:15:04Z felipe $ */
                     21: 
                     22: #ifndef ZEND_PTR_STACK_H
                     23: #define ZEND_PTR_STACK_H
                     24: 
                     25: typedef struct _zend_ptr_stack {
                     26:        int top, max;
                     27:        void **elements;
                     28:        void **top_element;
                     29:        zend_bool persistent;
                     30: } zend_ptr_stack;
                     31: 
                     32: 
                     33: #define PTR_STACK_BLOCK_SIZE 64
                     34: 
                     35: BEGIN_EXTERN_C()
                     36: ZEND_API void zend_ptr_stack_init(zend_ptr_stack *stack);
                     37: ZEND_API void zend_ptr_stack_init_ex(zend_ptr_stack *stack, zend_bool persistent);
                     38: ZEND_API void zend_ptr_stack_n_push(zend_ptr_stack *stack, int count, ...);
                     39: ZEND_API void zend_ptr_stack_n_pop(zend_ptr_stack *stack, int count, ...);
                     40: ZEND_API void zend_ptr_stack_destroy(zend_ptr_stack *stack);
                     41: ZEND_API void zend_ptr_stack_apply(zend_ptr_stack *stack, void (*func)(void *));
                     42: ZEND_API void zend_ptr_stack_clean(zend_ptr_stack *stack, void (*func)(void *), zend_bool free_elements);
                     43: ZEND_API int zend_ptr_stack_num_elements(zend_ptr_stack *stack);
                     44: END_EXTERN_C()
                     45: 
                     46: #define ZEND_PTR_STACK_RESIZE_IF_NEEDED(stack, count)          \
                     47:        if (stack->top+count > stack->max) {                                    \
                     48:                /* we need to allocate more memory */                           \
                     49:                stack->max *= 2;                                                                        \
                     50:                stack->max += count;                                                            \
                     51:                stack->elements = (void **) perealloc(stack->elements, (sizeof(void *) * (stack->max)), stack->persistent);     \
                     52:                stack->top_element = stack->elements+stack->top;        \
                     53:        }
                     54: 
                     55: /*     Not doing this with a macro because of the loop unrolling in the element assignment.
                     56:        Just using a macro for 3 in the body for readability sake. */
                     57: static inline void zend_ptr_stack_3_push(zend_ptr_stack *stack, void *a, void *b, void *c)
                     58: {
                     59: #define ZEND_PTR_STACK_NUM_ARGS 3
                     60: 
                     61:        ZEND_PTR_STACK_RESIZE_IF_NEEDED(stack, ZEND_PTR_STACK_NUM_ARGS)
                     62: 
                     63:        stack->top += ZEND_PTR_STACK_NUM_ARGS;
                     64:        *(stack->top_element++) = a;
                     65:        *(stack->top_element++) = b;
                     66:        *(stack->top_element++) = c;
                     67: 
                     68: #undef ZEND_PTR_STACK_NUM_ARGS
                     69: }
                     70: 
                     71: static inline void zend_ptr_stack_2_push(zend_ptr_stack *stack, void *a, void *b)
                     72: {
                     73: #define ZEND_PTR_STACK_NUM_ARGS 2
                     74: 
                     75:        ZEND_PTR_STACK_RESIZE_IF_NEEDED(stack, ZEND_PTR_STACK_NUM_ARGS)
                     76: 
                     77:        stack->top += ZEND_PTR_STACK_NUM_ARGS;
                     78:        *(stack->top_element++) = a;
                     79:        *(stack->top_element++) = b;
                     80: 
                     81: #undef ZEND_PTR_STACK_NUM_ARGS
                     82: }
                     83: 
                     84: static inline void zend_ptr_stack_3_pop(zend_ptr_stack *stack, void **a, void **b, void **c)
                     85: {
                     86:        *a = *(--stack->top_element);
                     87:        *b = *(--stack->top_element);
                     88:        *c = *(--stack->top_element);
                     89:        stack->top -= 3;
                     90: }
                     91: 
                     92: static inline void zend_ptr_stack_2_pop(zend_ptr_stack *stack, void **a, void **b)
                     93: {
                     94:        *a = *(--stack->top_element);
                     95:        *b = *(--stack->top_element);
                     96:        stack->top -= 2;
                     97: }
                     98: 
                     99: static inline void zend_ptr_stack_push(zend_ptr_stack *stack, void *ptr)
                    100: {
                    101:        ZEND_PTR_STACK_RESIZE_IF_NEEDED(stack, 1)
                    102: 
                    103:        stack->top++;
                    104:        *(stack->top_element++) = ptr;
                    105: }
                    106: 
                    107: static inline void *zend_ptr_stack_pop(zend_ptr_stack *stack)
                    108: {
                    109:        stack->top--;
                    110:        return *(--stack->top_element);
                    111: }
                    112: 
                    113: #endif /* ZEND_PTR_STACK_H */
                    114: 
                    115: /*
                    116:  * Local variables:
                    117:  * tab-width: 4
                    118:  * c-basic-offset: 4
                    119:  * indent-tabs-mode: t
                    120:  * End:
                    121:  */