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Annotation of embedaddon/php/Zend/zend_ptr_stack.h, revision 1.1

1.1     ! misho       1: /*
        !             2:    +----------------------------------------------------------------------+
        !             3:    | Zend Engine                                                          |
        !             4:    +----------------------------------------------------------------------+
        !             5:    | Copyright (c) 1998-2012 Zend Technologies Ltd. (http://www.zend.com) |
        !             6:    +----------------------------------------------------------------------+
        !             7:    | This source file is subject to version 2.00 of the Zend license,     |
        !             8:    | that is bundled with this package in the file LICENSE, and is        | 
        !             9:    | available through the world-wide-web at the following url:           |
        !            10:    | http://www.zend.com/license/2_00.txt.                                |
        !            11:    | If you did not receive a copy of the Zend license and are unable to  |
        !            12:    | obtain it through the world-wide-web, please send a note to          |
        !            13:    | license@zend.com so we can mail you a copy immediately.              |
        !            14:    +----------------------------------------------------------------------+
        !            15:    | Authors: Andi Gutmans <andi@zend.com>                                |
        !            16:    |          Zeev Suraski <zeev@zend.com>                                |
        !            17:    +----------------------------------------------------------------------+
        !            18: */
        !            19: 
        !            20: /* $Id: zend_ptr_stack.h 321634 2012-01-01 13:15:04Z felipe $ */
        !            21: 
        !            22: #ifndef ZEND_PTR_STACK_H
        !            23: #define ZEND_PTR_STACK_H
        !            24: 
        !            25: typedef struct _zend_ptr_stack {
        !            26:        int top, max;
        !            27:        void **elements;
        !            28:        void **top_element;
        !            29:        zend_bool persistent;
        !            30: } zend_ptr_stack;
        !            31: 
        !            32: 
        !            33: #define PTR_STACK_BLOCK_SIZE 64
        !            34: 
        !            35: BEGIN_EXTERN_C()
        !            36: ZEND_API void zend_ptr_stack_init(zend_ptr_stack *stack);
        !            37: ZEND_API void zend_ptr_stack_init_ex(zend_ptr_stack *stack, zend_bool persistent);
        !            38: ZEND_API void zend_ptr_stack_n_push(zend_ptr_stack *stack, int count, ...);
        !            39: ZEND_API void zend_ptr_stack_n_pop(zend_ptr_stack *stack, int count, ...);
        !            40: ZEND_API void zend_ptr_stack_destroy(zend_ptr_stack *stack);
        !            41: ZEND_API void zend_ptr_stack_apply(zend_ptr_stack *stack, void (*func)(void *));
        !            42: ZEND_API void zend_ptr_stack_clean(zend_ptr_stack *stack, void (*func)(void *), zend_bool free_elements);
        !            43: ZEND_API int zend_ptr_stack_num_elements(zend_ptr_stack *stack);
        !            44: END_EXTERN_C()
        !            45: 
        !            46: #define ZEND_PTR_STACK_RESIZE_IF_NEEDED(stack, count)          \
        !            47:        if (stack->top+count > stack->max) {                                    \
        !            48:                /* we need to allocate more memory */                           \
        !            49:                stack->max *= 2;                                                                        \
        !            50:                stack->max += count;                                                            \
        !            51:                stack->elements = (void **) perealloc(stack->elements, (sizeof(void *) * (stack->max)), stack->persistent);     \
        !            52:                stack->top_element = stack->elements+stack->top;        \
        !            53:        }
        !            54: 
        !            55: /*     Not doing this with a macro because of the loop unrolling in the element assignment.
        !            56:        Just using a macro for 3 in the body for readability sake. */
        !            57: static inline void zend_ptr_stack_3_push(zend_ptr_stack *stack, void *a, void *b, void *c)
        !            58: {
        !            59: #define ZEND_PTR_STACK_NUM_ARGS 3
        !            60: 
        !            61:        ZEND_PTR_STACK_RESIZE_IF_NEEDED(stack, ZEND_PTR_STACK_NUM_ARGS)
        !            62: 
        !            63:        stack->top += ZEND_PTR_STACK_NUM_ARGS;
        !            64:        *(stack->top_element++) = a;
        !            65:        *(stack->top_element++) = b;
        !            66:        *(stack->top_element++) = c;
        !            67: 
        !            68: #undef ZEND_PTR_STACK_NUM_ARGS
        !            69: }
        !            70: 
        !            71: static inline void zend_ptr_stack_2_push(zend_ptr_stack *stack, void *a, void *b)
        !            72: {
        !            73: #define ZEND_PTR_STACK_NUM_ARGS 2
        !            74: 
        !            75:        ZEND_PTR_STACK_RESIZE_IF_NEEDED(stack, ZEND_PTR_STACK_NUM_ARGS)
        !            76: 
        !            77:        stack->top += ZEND_PTR_STACK_NUM_ARGS;
        !            78:        *(stack->top_element++) = a;
        !            79:        *(stack->top_element++) = b;
        !            80: 
        !            81: #undef ZEND_PTR_STACK_NUM_ARGS
        !            82: }
        !            83: 
        !            84: static inline void zend_ptr_stack_3_pop(zend_ptr_stack *stack, void **a, void **b, void **c)
        !            85: {
        !            86:        *a = *(--stack->top_element);
        !            87:        *b = *(--stack->top_element);
        !            88:        *c = *(--stack->top_element);
        !            89:        stack->top -= 3;
        !            90: }
        !            91: 
        !            92: static inline void zend_ptr_stack_2_pop(zend_ptr_stack *stack, void **a, void **b)
        !            93: {
        !            94:        *a = *(--stack->top_element);
        !            95:        *b = *(--stack->top_element);
        !            96:        stack->top -= 2;
        !            97: }
        !            98: 
        !            99: static inline void zend_ptr_stack_push(zend_ptr_stack *stack, void *ptr)
        !           100: {
        !           101:        ZEND_PTR_STACK_RESIZE_IF_NEEDED(stack, 1)
        !           102: 
        !           103:        stack->top++;
        !           104:        *(stack->top_element++) = ptr;
        !           105: }
        !           106: 
        !           107: static inline void *zend_ptr_stack_pop(zend_ptr_stack *stack)
        !           108: {
        !           109:        stack->top--;
        !           110:        return *(--stack->top_element);
        !           111: }
        !           112: 
        !           113: #endif /* ZEND_PTR_STACK_H */
        !           114: 
        !           115: /*
        !           116:  * Local variables:
        !           117:  * tab-width: 4
        !           118:  * c-basic-offset: 4
        !           119:  * indent-tabs-mode: t
        !           120:  * End:
        !           121:  */