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/*
+----------------------------------------------------------------------+
| Zend Engine |
+----------------------------------------------------------------------+
| Copyright (c) The PHP Group |
+----------------------------------------------------------------------+
| This source file is subject to version 3.01 of the PHP license, |
| that is bundled with this package in the file LICENSE, and is |
| available through the world-wide-web at the following url: |
| https://www.php.net/license/3_01.txt |
| If you did not receive a copy of the PHP license and are unable to |
| obtain it through the world-wide-web, please send a note to |
| license@php.net so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Authors: Andy Wingo <wingo@igalia.com> |
+----------------------------------------------------------------------+
*/
#ifndef _ZEND_WORKLIST_H_
#define _ZEND_WORKLIST_H_
#include "zend_arena.h"
#include "zend_bitset.h"
typedef struct _zend_worklist_stack {
int *buf;
int len;
int capacity;
} zend_worklist_stack;
#define ZEND_WORKLIST_STACK_ALLOCA(s, _len, use_heap) do { \
(s)->buf = (int*)do_alloca(sizeof(int) * _len, use_heap); \
(s)->len = 0; \
(s)->capacity = _len; \
} while (0)
#define ZEND_WORKLIST_STACK_FREE_ALLOCA(s, use_heap) \
free_alloca((s)->buf, use_heap)
static inline void zend_worklist_stack_prepare(zend_arena **arena, zend_worklist_stack *stack, int len)
{
ZEND_ASSERT(len >= 0);
stack->buf = (int*)zend_arena_calloc(arena, sizeof(*stack->buf), len);
stack->len = 0;
stack->capacity = len;
}
static inline void zend_worklist_stack_push(zend_worklist_stack *stack, int i)
{
ZEND_ASSERT(stack->len < stack->capacity);
stack->buf[stack->len++] = i;
}
static inline int zend_worklist_stack_peek(const zend_worklist_stack *stack)
{
ZEND_ASSERT(stack->len);
return stack->buf[stack->len - 1];
}
static inline int zend_worklist_stack_pop(zend_worklist_stack *stack)
{
ZEND_ASSERT(stack->len);
return stack->buf[--stack->len];
}
typedef struct _zend_worklist {
zend_bitset visited;
zend_worklist_stack stack;
} zend_worklist;
#define ZEND_WORKLIST_ALLOCA(w, _len, use_heap) do { \
(w)->stack.buf = (int*)do_alloca(ZEND_MM_ALIGNED_SIZE(sizeof(int) * _len) + sizeof(zend_ulong) * zend_bitset_len(_len), use_heap); \
(w)->stack.len = 0; \
(w)->stack.capacity = _len; \
(w)->visited = (zend_bitset)((char*)(w)->stack.buf + ZEND_MM_ALIGNED_SIZE(sizeof(int) * _len)); \
memset((w)->visited, 0, sizeof(zend_ulong) * zend_bitset_len(_len)); \
} while (0)
#define ZEND_WORKLIST_FREE_ALLOCA(w, use_heap) \
free_alloca((w)->stack.buf, use_heap)
static inline void zend_worklist_prepare(zend_arena **arena, zend_worklist *worklist, int len)
{
ZEND_ASSERT(len >= 0);
worklist->visited = (zend_bitset)zend_arena_calloc(arena, sizeof(zend_ulong), zend_bitset_len(len));
zend_worklist_stack_prepare(arena, &worklist->stack, len);
}
static inline int zend_worklist_len(const zend_worklist *worklist)
{
return worklist->stack.len;
}
static inline bool zend_worklist_push(zend_worklist *worklist, int i)
{
ZEND_ASSERT(i >= 0 && i < worklist->stack.capacity);
if (zend_bitset_in(worklist->visited, i)) {
return 0;
}
zend_bitset_incl(worklist->visited, i);
zend_worklist_stack_push(&worklist->stack, i);
return 1;
}
static inline int zend_worklist_peek(const zend_worklist *worklist)
{
return zend_worklist_stack_peek(&worklist->stack);
}
static inline int zend_worklist_pop(zend_worklist *worklist)
{
/* Does not clear visited flag */
return zend_worklist_stack_pop(&worklist->stack);
}
#endif /* _ZEND_WORKLIST_H_ */