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: */
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