1 /*
2 +----------------------------------------------------------------------+
3 | Zend Engine |
4 +----------------------------------------------------------------------+
5 | Copyright (c) 1998-2018 The PHP Group |
6 +----------------------------------------------------------------------+
7 | This source file is subject to version 3.01 of the PHP 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.php.net/license/3_01.txt |
11 | If you did not receive a copy of the PHP license and are unable to |
12 | obtain it through the world-wide-web, please send a note to |
13 | license@php.net so we can mail you a copy immediately. |
14 +----------------------------------------------------------------------+
15 | Authors: Andy Wingo <wingo@igalia.com> |
16 +----------------------------------------------------------------------+
17 */
18
19 /* $Id:$ */
20
21 #ifndef _ZEND_WORKLIST_H_
22 #define _ZEND_WORKLIST_H_
23
24 #include "zend_arena.h"
25 #include "zend_bitset.h"
26
27 typedef struct _zend_worklist_stack {
28 int *buf;
29 int len;
30 int capacity;
31 } zend_worklist_stack;
32
33 #define ZEND_WORKLIST_STACK_ALLOCA(s, _len, use_heap) do { \
34 (s)->buf = (int*)do_alloca(sizeof(int) * _len, use_heap); \
35 (s)->len = 0; \
36 (s)->capacity = _len; \
37 } while (0)
38
39 #define ZEND_WORKLIST_STACK_FREE_ALLOCA(s, use_heap) \
40 free_alloca((s)->buf, use_heap)
41
zend_worklist_stack_prepare(zend_arena ** arena,zend_worklist_stack * stack,int len)42 static inline int zend_worklist_stack_prepare(zend_arena **arena, zend_worklist_stack *stack, int len)
43 {
44 ZEND_ASSERT(len >= 0);
45
46 stack->buf = (int*)zend_arena_calloc(arena, sizeof(*stack->buf), len);
47 stack->len = 0;
48 stack->capacity = len;
49
50 return SUCCESS;
51 }
52
zend_worklist_stack_push(zend_worklist_stack * stack,int i)53 static inline void zend_worklist_stack_push(zend_worklist_stack *stack, int i)
54 {
55 ZEND_ASSERT(stack->len < stack->capacity);
56 stack->buf[stack->len++] = i;
57 }
58
zend_worklist_stack_peek(zend_worklist_stack * stack)59 static inline int zend_worklist_stack_peek(zend_worklist_stack *stack)
60 {
61 ZEND_ASSERT(stack->len);
62 return stack->buf[stack->len - 1];
63 }
64
zend_worklist_stack_pop(zend_worklist_stack * stack)65 static inline int zend_worklist_stack_pop(zend_worklist_stack *stack)
66 {
67 ZEND_ASSERT(stack->len);
68 return stack->buf[--stack->len];
69 }
70
71 typedef struct _zend_worklist {
72 zend_bitset visited;
73 zend_worklist_stack stack;
74 } zend_worklist;
75
76 #define ZEND_WORKLIST_ALLOCA(w, _len, use_heap) do { \
77 (w)->stack.buf = (int*)do_alloca(ZEND_MM_ALIGNED_SIZE(sizeof(int) * _len) + sizeof(zend_ulong) * zend_bitset_len(_len), use_heap); \
78 (w)->stack.len = 0; \
79 (w)->stack.capacity = _len; \
80 (w)->visited = (zend_bitset)((char*)(w)->stack.buf + ZEND_MM_ALIGNED_SIZE(sizeof(int) * _len)); \
81 memset((w)->visited, 0, sizeof(zend_ulong) * zend_bitset_len(_len)); \
82 } while (0)
83
84 #define ZEND_WORKLIST_FREE_ALLOCA(w, use_heap) \
85 free_alloca((w)->stack.buf, use_heap)
86
zend_worklist_prepare(zend_arena ** arena,zend_worklist * worklist,int len)87 static inline int zend_worklist_prepare(zend_arena **arena, zend_worklist *worklist, int len)
88 {
89 ZEND_ASSERT(len >= 0);
90 worklist->visited = (zend_bitset)zend_arena_calloc(arena, sizeof(zend_ulong), zend_bitset_len(len));
91 return zend_worklist_stack_prepare(arena, &worklist->stack, len);
92 }
93
zend_worklist_len(zend_worklist * worklist)94 static inline int zend_worklist_len(zend_worklist *worklist)
95 {
96 return worklist->stack.len;
97 }
98
zend_worklist_push(zend_worklist * worklist,int i)99 static inline int zend_worklist_push(zend_worklist *worklist, int i)
100 {
101 ZEND_ASSERT(i >= 0 && i < worklist->stack.capacity);
102
103 if (zend_bitset_in(worklist->visited, i)) {
104 return 0;
105 }
106
107 zend_bitset_incl(worklist->visited, i);
108 zend_worklist_stack_push(&worklist->stack, i);
109 return 1;
110 }
111
zend_worklist_peek(zend_worklist * worklist)112 static inline int zend_worklist_peek(zend_worklist *worklist)
113 {
114 return zend_worklist_stack_peek(&worklist->stack);
115 }
116
zend_worklist_pop(zend_worklist * worklist)117 static inline int zend_worklist_pop(zend_worklist *worklist)
118 {
119 /* Does not clear visited flag */
120 return zend_worklist_stack_pop(&worklist->stack);
121 }
122
123 #endif /* _ZEND_WORKLIST_H_ */
124
125 /*
126 * Local variables:
127 * tab-width: 4
128 * c-basic-offset: 4
129 * indent-tabs-mode: t
130 * End:
131 */
132
