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Diffstat (limited to 'Zend/Optimizer/zend_worklist.h')
| -rw-r--r-- | Zend/Optimizer/zend_worklist.h | 121 |
1 files changed, 121 insertions, 0 deletions
diff --git a/Zend/Optimizer/zend_worklist.h b/Zend/Optimizer/zend_worklist.h new file mode 100644 index 0000000000..2f3e3dd979 --- /dev/null +++ b/Zend/Optimizer/zend_worklist.h @@ -0,0 +1,121 @@ +/* + +----------------------------------------------------------------------+ + | 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: | + | http://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 int 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; + + return SUCCESS; +} + +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(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 int 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)); + return zend_worklist_stack_prepare(arena, &worklist->stack, len); +} + +static inline int zend_worklist_len(zend_worklist *worklist) +{ + return worklist->stack.len; +} + +static inline int 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(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_ */ |