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zend_worklist.h

/*
   +----------------------------------------------------------------------+
   | 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_ */

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/linksafe	0755	2025-09-13 07:02:03
..	dir	-	root/linksafe	0755	2025-09-13 07:02:03
zend_call_graph.h	text/x-c	3.25 KB	root/linksafe	0644	2025-08-27 07:26:51
zend_cfg.h	text/x-c	5.51 KB	root/linksafe	0644	2025-08-27 07:26:51
zend_dfg.h	text/x-c	2 KB	root/linksafe	0644	2025-08-27 07:26:51
zend_dump.h	text/x-c	2.72 KB	root/linksafe	0644	2025-08-27 07:26:51
zend_func_info.h	text/x-c	2.98 KB	root/linksafe	0644	2025-08-27 07:26:51
zend_inference.h	text/x-c	10.28 KB	root/linksafe	0644	2025-08-27 07:26:51
zend_optimizer.h	text/x-c	4.84 KB	root/linksafe	0644	2025-08-27 07:26:51
zend_ssa.h	text/x-c	11.74 KB	root/linksafe	0644	2025-08-27 07:26:51
zend_worklist.h	text/x-c	3.82 KB	root/linksafe	0644	2025-08-27 07:26:51

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