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119 lines
4.2 KiB
C
119 lines
4.2 KiB
C
/*
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+----------------------------------------------------------------------+
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| Zend Engine |
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+----------------------------------------------------------------------+
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| Copyright (c) Zend Technologies Ltd. (http://www.zend.com) |
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+----------------------------------------------------------------------+
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| This source file is subject to version 2.00 of the Zend 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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| http://www.zend.com/license/2_00.txt. |
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| If you did not receive a copy of the Zend 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@zend.com so we can mail you a copy immediately. |
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+----------------------------------------------------------------------+
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| Authors: Andi Gutmans <andi@php.net> |
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| Zeev Suraski <zeev@php.net> |
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+----------------------------------------------------------------------+
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*/
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#ifndef ZEND_PTR_STACK_H
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#define ZEND_PTR_STACK_H
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typedef struct _zend_ptr_stack {
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int top, max;
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void **elements;
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void **top_element;
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bool persistent;
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} zend_ptr_stack;
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#define PTR_STACK_BLOCK_SIZE 64
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BEGIN_EXTERN_C()
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ZEND_API void zend_ptr_stack_init(zend_ptr_stack *stack);
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ZEND_API void zend_ptr_stack_init_ex(zend_ptr_stack *stack, bool persistent);
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ZEND_API void zend_ptr_stack_n_push(zend_ptr_stack *stack, int count, ...);
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ZEND_API void zend_ptr_stack_n_pop(zend_ptr_stack *stack, int count, ...);
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ZEND_API void zend_ptr_stack_destroy(zend_ptr_stack *stack);
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ZEND_API void zend_ptr_stack_apply(zend_ptr_stack *stack, void (*func)(void *));
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ZEND_API void zend_ptr_stack_reverse_apply(zend_ptr_stack *stack, void (*func)(void *));
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ZEND_API void zend_ptr_stack_clean(zend_ptr_stack *stack, void (*func)(void *), bool free_elements);
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ZEND_API int zend_ptr_stack_num_elements(zend_ptr_stack *stack);
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END_EXTERN_C()
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#define ZEND_PTR_STACK_RESIZE_IF_NEEDED(stack, count) \
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if (stack->top+count > stack->max) { \
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/* we need to allocate more memory */ \
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do { \
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stack->max += PTR_STACK_BLOCK_SIZE; \
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} while (stack->top+count > stack->max); \
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stack->elements = (void **) safe_perealloc(stack->elements, sizeof(void *), (stack->max), 0, stack->persistent); \
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stack->top_element = stack->elements+stack->top; \
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}
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/* Not doing this with a macro because of the loop unrolling in the element assignment.
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Just using a macro for 3 in the body for readability sake. */
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static zend_always_inline void zend_ptr_stack_3_push(zend_ptr_stack *stack, void *a, void *b, void *c)
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{
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#define ZEND_PTR_STACK_NUM_ARGS 3
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ZEND_PTR_STACK_RESIZE_IF_NEEDED(stack, ZEND_PTR_STACK_NUM_ARGS)
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stack->top += ZEND_PTR_STACK_NUM_ARGS;
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*(stack->top_element++) = a;
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*(stack->top_element++) = b;
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*(stack->top_element++) = c;
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#undef ZEND_PTR_STACK_NUM_ARGS
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}
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static zend_always_inline void zend_ptr_stack_2_push(zend_ptr_stack *stack, void *a, void *b)
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{
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#define ZEND_PTR_STACK_NUM_ARGS 2
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ZEND_PTR_STACK_RESIZE_IF_NEEDED(stack, ZEND_PTR_STACK_NUM_ARGS)
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stack->top += ZEND_PTR_STACK_NUM_ARGS;
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*(stack->top_element++) = a;
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*(stack->top_element++) = b;
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#undef ZEND_PTR_STACK_NUM_ARGS
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}
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static zend_always_inline void zend_ptr_stack_3_pop(zend_ptr_stack *stack, void **a, void **b, void **c)
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{
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*a = *(--stack->top_element);
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*b = *(--stack->top_element);
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*c = *(--stack->top_element);
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stack->top -= 3;
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}
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static zend_always_inline void zend_ptr_stack_2_pop(zend_ptr_stack *stack, void **a, void **b)
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{
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*a = *(--stack->top_element);
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*b = *(--stack->top_element);
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stack->top -= 2;
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}
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static zend_always_inline void zend_ptr_stack_push(zend_ptr_stack *stack, void *ptr)
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{
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ZEND_PTR_STACK_RESIZE_IF_NEEDED(stack, 1)
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stack->top++;
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*(stack->top_element++) = ptr;
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}
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static zend_always_inline void *zend_ptr_stack_pop(zend_ptr_stack *stack)
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{
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stack->top--;
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return *(--stack->top_element);
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}
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static zend_always_inline void *zend_ptr_stack_top(zend_ptr_stack *stack)
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{
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return stack->elements[stack->top - 1];
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}
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#endif /* ZEND_PTR_STACK_H */
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