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Diffstat (limited to 'Zend/zend_ptr_stack.h')
| -rw-r--r-- | Zend/zend_ptr_stack.h | 122 |
1 files changed, 122 insertions, 0 deletions
diff --git a/Zend/zend_ptr_stack.h b/Zend/zend_ptr_stack.h new file mode 100644 index 0000000..e2e7705 --- /dev/null +++ b/Zend/zend_ptr_stack.h @@ -0,0 +1,122 @@ +/* + +----------------------------------------------------------------------+ + | Zend Engine | + +----------------------------------------------------------------------+ + | Copyright (c) 1998-2013 Zend Technologies Ltd. (http://www.zend.com) | + +----------------------------------------------------------------------+ + | This source file is subject to version 2.00 of the Zend 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.zend.com/license/2_00.txt. | + | If you did not receive a copy of the Zend license and are unable to | + | obtain it through the world-wide-web, please send a note to | + | license@zend.com so we can mail you a copy immediately. | + +----------------------------------------------------------------------+ + | Authors: Andi Gutmans <andi@zend.com> | + | Zeev Suraski <zeev@zend.com> | + +----------------------------------------------------------------------+ +*/ + +/* $Id$ */ + +#ifndef ZEND_PTR_STACK_H +#define ZEND_PTR_STACK_H + +typedef struct _zend_ptr_stack { + int top, max; + void **elements; + void **top_element; + zend_bool persistent; +} zend_ptr_stack; + + +#define PTR_STACK_BLOCK_SIZE 64 + +BEGIN_EXTERN_C() +ZEND_API void zend_ptr_stack_init(zend_ptr_stack *stack); +ZEND_API void zend_ptr_stack_init_ex(zend_ptr_stack *stack, zend_bool persistent); +ZEND_API void zend_ptr_stack_n_push(zend_ptr_stack *stack, int count, ...); +ZEND_API void zend_ptr_stack_n_pop(zend_ptr_stack *stack, int count, ...); +ZEND_API void zend_ptr_stack_destroy(zend_ptr_stack *stack); +ZEND_API void zend_ptr_stack_apply(zend_ptr_stack *stack, void (*func)(void *)); +ZEND_API void zend_ptr_stack_clean(zend_ptr_stack *stack, void (*func)(void *), zend_bool free_elements); +ZEND_API int zend_ptr_stack_num_elements(zend_ptr_stack *stack); +END_EXTERN_C() + +#define ZEND_PTR_STACK_RESIZE_IF_NEEDED(stack, count) \ + if (stack->top+count > stack->max) { \ + /* we need to allocate more memory */ \ + do { \ + stack->max += PTR_STACK_BLOCK_SIZE; \ + } while (stack->top+count > stack->max); \ + stack->elements = (void **) perealloc(stack->elements, (sizeof(void *) * (stack->max)), stack->persistent); \ + stack->top_element = stack->elements+stack->top; \ + } + +/* Not doing this with a macro because of the loop unrolling in the element assignment. + Just using a macro for 3 in the body for readability sake. */ +static zend_always_inline void zend_ptr_stack_3_push(zend_ptr_stack *stack, void *a, void *b, void *c) +{ +#define ZEND_PTR_STACK_NUM_ARGS 3 + + ZEND_PTR_STACK_RESIZE_IF_NEEDED(stack, ZEND_PTR_STACK_NUM_ARGS) + + stack->top += ZEND_PTR_STACK_NUM_ARGS; + *(stack->top_element++) = a; + *(stack->top_element++) = b; + *(stack->top_element++) = c; + +#undef ZEND_PTR_STACK_NUM_ARGS +} + +static zend_always_inline void zend_ptr_stack_2_push(zend_ptr_stack *stack, void *a, void *b) +{ +#define ZEND_PTR_STACK_NUM_ARGS 2 + + ZEND_PTR_STACK_RESIZE_IF_NEEDED(stack, ZEND_PTR_STACK_NUM_ARGS) + + stack->top += ZEND_PTR_STACK_NUM_ARGS; + *(stack->top_element++) = a; + *(stack->top_element++) = b; + +#undef ZEND_PTR_STACK_NUM_ARGS +} + +static zend_always_inline void zend_ptr_stack_3_pop(zend_ptr_stack *stack, void **a, void **b, void **c) +{ + *a = *(--stack->top_element); + *b = *(--stack->top_element); + *c = *(--stack->top_element); + stack->top -= 3; +} + +static zend_always_inline void zend_ptr_stack_2_pop(zend_ptr_stack *stack, void **a, void **b) +{ + *a = *(--stack->top_element); + *b = *(--stack->top_element); + stack->top -= 2; +} + +static zend_always_inline void zend_ptr_stack_push(zend_ptr_stack *stack, void *ptr) +{ + ZEND_PTR_STACK_RESIZE_IF_NEEDED(stack, 1) + + stack->top++; + *(stack->top_element++) = ptr; +} + +static zend_always_inline void *zend_ptr_stack_pop(zend_ptr_stack *stack) +{ + stack->top--; + return *(--stack->top_element); +} + +#endif /* ZEND_PTR_STACK_H */ + +/* + * Local variables: + * tab-width: 4 + * c-basic-offset: 4 + * indent-tabs-mode: t + * End: + */ |