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