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spl_heap.c
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/*
+----------------------------------------------------------------------+
| PHP Version 7 |
+----------------------------------------------------------------------+
| Copyright (c) 1997-2018 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 |
| [email protected] so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Authors: Etienne Kneuss <[email protected]> |
+----------------------------------------------------------------------+
*/
/* $Id$ */
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include "php.h"
#include "zend_exceptions.h"
#include "php_spl.h"
#include "spl_functions.h"
#include "spl_engine.h"
#include "spl_iterators.h"
#include "spl_heap.h"
#include "spl_exceptions.h"
#define PTR_HEAP_BLOCK_SIZE 64
#define SPL_HEAP_CORRUPTED 0x00000001
#define SPL_PQUEUE_EXTR_MASK 0x00000003
#define SPL_PQUEUE_EXTR_BOTH 0x00000003
#define SPL_PQUEUE_EXTR_DATA 0x00000001
#define SPL_PQUEUE_EXTR_PRIORITY 0x00000002
zend_object_handlers spl_handler_SplHeap;
zend_object_handlers spl_handler_SplPriorityQueue;
PHPAPI zend_class_entry *spl_ce_SplHeap;
PHPAPI zend_class_entry *spl_ce_SplMaxHeap;
PHPAPI zend_class_entry *spl_ce_SplMinHeap;
PHPAPI zend_class_entry *spl_ce_SplPriorityQueue;
typedef void (*spl_ptr_heap_dtor_func)(zval *);
typedef void (*spl_ptr_heap_ctor_func)(zval *);
typedef int (*spl_ptr_heap_cmp_func)(zval *, zval *, zval *);
typedef struct _spl_ptr_heap {
zval *elements;
spl_ptr_heap_ctor_func ctor;
spl_ptr_heap_dtor_func dtor;
spl_ptr_heap_cmp_func cmp;
int count;
int max_size;
int flags;
} spl_ptr_heap;
typedef struct _spl_heap_object spl_heap_object;
typedef struct _spl_heap_it spl_heap_it;
struct _spl_heap_object {
spl_ptr_heap *heap;
int flags;
zend_class_entry *ce_get_iterator;
zend_function *fptr_cmp;
zend_function *fptr_count;
zend_object std;
};
/* define an overloaded iterator structure */
struct _spl_heap_it {
zend_user_iterator intern;
int flags;
};
static inline spl_heap_object *spl_heap_from_obj(zend_object *obj) /* {{{ */ {
return (spl_heap_object*)((char*)(obj) - XtOffsetOf(spl_heap_object, std));
}
/* }}} */
#define Z_SPLHEAP_P(zv) spl_heap_from_obj(Z_OBJ_P((zv)))
static void spl_ptr_heap_zval_dtor(zval *elem) { /* {{{ */
if (!Z_ISUNDEF_P(elem)) {
zval_ptr_dtor(elem);
}
}
/* }}} */
static void spl_ptr_heap_zval_ctor(zval *elem) { /* {{{ */
Z_TRY_ADDREF_P(elem);
}
/* }}} */
static int spl_ptr_heap_cmp_cb_helper(zval *object, spl_heap_object *heap_object, zval *a, zval *b, zend_long *result) { /* {{{ */
zval zresult;
zend_call_method_with_2_params(object, heap_object->std.ce, &heap_object->fptr_cmp, "compare", &zresult, a, b);
if (EG(exception)) {
return FAILURE;
}
*result = zval_get_long(&zresult);
zval_ptr_dtor(&zresult);
return SUCCESS;
}
/* }}} */
static zval *spl_pqueue_extract_helper(zval *value, int flags) /* {{{ */
{
if ((flags & SPL_PQUEUE_EXTR_BOTH) == SPL_PQUEUE_EXTR_BOTH) {
return value;
} else if ((flags & SPL_PQUEUE_EXTR_BOTH) > 0) {
if ((flags & SPL_PQUEUE_EXTR_DATA) == SPL_PQUEUE_EXTR_DATA) {
zval *data;
if ((data = zend_hash_str_find(Z_ARRVAL_P(value), "data", sizeof("data") - 1)) != NULL) {
return data;
}
} else {
zval *priority;
if ((priority = zend_hash_str_find(Z_ARRVAL_P(value), "priority", sizeof("priority") - 1)) != NULL) {
return priority;
}
}
}
return NULL;
}
/* }}} */
static int spl_ptr_heap_zval_max_cmp(zval *a, zval *b, zval *object) { /* {{{ */
zval result;
if (EG(exception)) {
return 0;
}
if (object) {
spl_heap_object *heap_object = Z_SPLHEAP_P(object);
if (heap_object->fptr_cmp) {
zend_long lval = 0;
if (spl_ptr_heap_cmp_cb_helper(object, heap_object, a, b, &lval) == FAILURE) {
/* exception or call failure */
return 0;
}
return lval > 0 ? 1 : (lval < 0 ? -1 : 0);
}
}
compare_function(&result, a, b);
return (int)Z_LVAL(result);
}
/* }}} */
static int spl_ptr_heap_zval_min_cmp(zval *a, zval *b, zval *object) { /* {{{ */
zval result;
if (EG(exception)) {
return 0;
}
if (object) {
spl_heap_object *heap_object = Z_SPLHEAP_P(object);
if (heap_object->fptr_cmp) {
zend_long lval = 0;
if (spl_ptr_heap_cmp_cb_helper(object, heap_object, a, b, &lval) == FAILURE) {
/* exception or call failure */
return 0;
}
return lval > 0 ? 1 : (lval < 0 ? -1 : 0);
}
}
compare_function(&result, b, a);
return (int)Z_LVAL(result);
}
/* }}} */
static int spl_ptr_pqueue_zval_cmp(zval *a, zval *b, zval *object) { /* {{{ */
zval result;
zval *a_priority_p = spl_pqueue_extract_helper(a, SPL_PQUEUE_EXTR_PRIORITY);
zval *b_priority_p = spl_pqueue_extract_helper(b, SPL_PQUEUE_EXTR_PRIORITY);
if ((!a_priority_p) || (!b_priority_p)) {
zend_error(E_RECOVERABLE_ERROR, "Unable to extract from the PriorityQueue node");
return 0;
}
if (EG(exception)) {
return 0;
}
if (object) {
spl_heap_object *heap_object = Z_SPLHEAP_P(object);
if (heap_object->fptr_cmp) {
zend_long lval = 0;
if (spl_ptr_heap_cmp_cb_helper((zval *)object, heap_object, a_priority_p, b_priority_p, &lval) == FAILURE) {
/* exception or call failure */
return 0;
}
return lval > 0 ? 1 : (lval < 0 ? -1 : 0);
}
}
compare_function(&result, a_priority_p, b_priority_p);
return (int)Z_LVAL(result);
}
/* }}} */
static spl_ptr_heap *spl_ptr_heap_init(spl_ptr_heap_cmp_func cmp, spl_ptr_heap_ctor_func ctor, spl_ptr_heap_dtor_func dtor) /* {{{ */
{
spl_ptr_heap *heap = emalloc(sizeof(spl_ptr_heap));
heap->dtor = dtor;
heap->ctor = ctor;
heap->cmp = cmp;
heap->elements = ecalloc(PTR_HEAP_BLOCK_SIZE, sizeof(zval));
heap->max_size = PTR_HEAP_BLOCK_SIZE;
heap->count = 0;
heap->flags = 0;
return heap;
}
/* }}} */
static void spl_ptr_heap_insert(spl_ptr_heap *heap, zval *elem, void *cmp_userdata) { /* {{{ */
int i;
if (heap->count+1 > heap->max_size) {
/* we need to allocate more memory */
heap->elements = erealloc(heap->elements, heap->max_size * 2 * sizeof(zval));
memset(heap->elements + heap->max_size, 0, heap->max_size * sizeof(zval));
heap->max_size *= 2;
}
/* sifting up */
for (i = heap->count; i > 0 && heap->cmp(&heap->elements[(i-1)/2], elem, cmp_userdata) < 0; i = (i-1)/2) {
heap->elements[i] = heap->elements[(i-1)/2];
}
heap->count++;
if (EG(exception)) {
/* exception thrown during comparison */
heap->flags |= SPL_HEAP_CORRUPTED;
}
ZVAL_COPY_VALUE(&heap->elements[i], elem);
}
/* }}} */
static zval *spl_ptr_heap_top(spl_ptr_heap *heap) { /* {{{ */
if (heap->count == 0) {
return NULL;
}
return Z_ISUNDEF(heap->elements[0])? NULL : &heap->elements[0];
}
/* }}} */
static void spl_ptr_heap_delete_top(spl_ptr_heap *heap, zval *elem, void *cmp_userdata) { /* {{{ */
int i, j;
const int limit = (heap->count-1)/2;
zval *bottom;
if (heap->count == 0) {
ZVAL_UNDEF(elem);
return;
}
ZVAL_COPY_VALUE(elem, &heap->elements[0]);
bottom = &heap->elements[--heap->count];
for (i = 0; i < limit; i = j) {
/* Find smaller child */
j = i * 2 + 1;
if(j != heap->count && heap->cmp(&heap->elements[j+1], &heap->elements[j], cmp_userdata) > 0) {
j++; /* next child is bigger */
}
/* swap elements between two levels */
if(heap->cmp(bottom, &heap->elements[j], cmp_userdata) < 0) {
heap->elements[i] = heap->elements[j];
} else {
break;
}
}
if (EG(exception)) {
/* exception thrown during comparison */
heap->flags |= SPL_HEAP_CORRUPTED;
}
ZVAL_COPY_VALUE(&heap->elements[i], bottom);
}
/* }}} */
static spl_ptr_heap *spl_ptr_heap_clone(spl_ptr_heap *from) { /* {{{ */
int i;
spl_ptr_heap *heap = emalloc(sizeof(spl_ptr_heap));
heap->dtor = from->dtor;
heap->ctor = from->ctor;
heap->cmp = from->cmp;
heap->max_size = from->max_size;
heap->count = from->count;
heap->flags = from->flags;
heap->elements = safe_emalloc(sizeof(zval), from->max_size, 0);
memcpy(heap->elements, from->elements, sizeof(zval)*from->max_size);
for (i=0; i < heap->count; ++i) {
heap->ctor(&heap->elements[i]);
}
return heap;
}
/* }}} */
static void spl_ptr_heap_destroy(spl_ptr_heap *heap) { /* {{{ */
int i;
for (i=0; i < heap->count; ++i) {
heap->dtor(&heap->elements[i]);
}
efree(heap->elements);
efree(heap);
}
/* }}} */
static int spl_ptr_heap_count(spl_ptr_heap *heap) { /* {{{ */
return heap->count;
}
/* }}} */
zend_object_iterator *spl_heap_get_iterator(zend_class_entry *ce, zval *object, int by_ref);
static void spl_heap_object_free_storage(zend_object *object) /* {{{ */
{
spl_heap_object *intern = spl_heap_from_obj(object);
zend_object_std_dtor(&intern->std);
spl_ptr_heap_destroy(intern->heap);
}
/* }}} */
static zend_object *spl_heap_object_new_ex(zend_class_entry *class_type, zval *orig, int clone_orig) /* {{{ */
{
spl_heap_object *intern;
zend_class_entry *parent = class_type;
int inherited = 0;
intern = zend_object_alloc(sizeof(spl_heap_object), parent);
zend_object_std_init(&intern->std, class_type);
object_properties_init(&intern->std, class_type);
intern->flags = 0;
intern->fptr_cmp = NULL;
if (orig) {
spl_heap_object *other = Z_SPLHEAP_P(orig);
intern->ce_get_iterator = other->ce_get_iterator;
if (clone_orig) {
intern->heap = spl_ptr_heap_clone(other->heap);
} else {
intern->heap = other->heap;
}
intern->flags = other->flags;
} else {
intern->heap = spl_ptr_heap_init(spl_ptr_heap_zval_max_cmp, spl_ptr_heap_zval_ctor, spl_ptr_heap_zval_dtor);
}
intern->std.handlers = &spl_handler_SplHeap;
while (parent) {
if (parent == spl_ce_SplPriorityQueue) {
intern->heap->cmp = spl_ptr_pqueue_zval_cmp;
intern->flags = SPL_PQUEUE_EXTR_DATA;
intern->std.handlers = &spl_handler_SplPriorityQueue;
break;
}
if (parent == spl_ce_SplMinHeap) {
intern->heap->cmp = spl_ptr_heap_zval_min_cmp;
break;
}
if (parent == spl_ce_SplMaxHeap) {
intern->heap->cmp = spl_ptr_heap_zval_max_cmp;
break;
}
if (parent == spl_ce_SplHeap) {
break;
}
parent = parent->parent;
inherited = 1;
}
if (!parent) { /* this must never happen */
php_error_docref(NULL, E_COMPILE_ERROR, "Internal compiler error, Class is not child of SplHeap");
}
if (inherited) {
intern->fptr_cmp = zend_hash_str_find_ptr(&class_type->function_table, "compare", sizeof("compare") - 1);
if (intern->fptr_cmp->common.scope == parent) {
intern->fptr_cmp = NULL;
}
intern->fptr_count = zend_hash_str_find_ptr(&class_type->function_table, "count", sizeof("count") - 1);
if (intern->fptr_count->common.scope == parent) {
intern->fptr_count = NULL;
}
}
return &intern->std;
}
/* }}} */
static zend_object *spl_heap_object_new(zend_class_entry *class_type) /* {{{ */
{
return spl_heap_object_new_ex(class_type, NULL, 0);
}
/* }}} */
static zend_object *spl_heap_object_clone(zval *zobject) /* {{{ */
{
zend_object *old_object;
zend_object *new_object;
old_object = Z_OBJ_P(zobject);
new_object = spl_heap_object_new_ex(old_object->ce, zobject, 1);
zend_objects_clone_members(new_object, old_object);
return new_object;
}
/* }}} */
static int spl_heap_object_count_elements(zval *object, zend_long *count) /* {{{ */
{
spl_heap_object *intern = Z_SPLHEAP_P(object);
if (intern->fptr_count) {
zval rv;
zend_call_method_with_0_params(object, intern->std.ce, &intern->fptr_count, "count", &rv);
if (!Z_ISUNDEF(rv)) {
*count = zval_get_long(&rv);
zval_ptr_dtor(&rv);
return SUCCESS;
}
*count = 0;
return FAILURE;
}
*count = spl_ptr_heap_count(intern->heap);
return SUCCESS;
}
/* }}} */
static HashTable* spl_heap_object_get_debug_info_helper(zend_class_entry *ce, zval *obj, int *is_temp) { /* {{{ */
spl_heap_object *intern = Z_SPLHEAP_P(obj);
zval tmp, heap_array;
zend_string *pnstr;
HashTable *debug_info;
int i;
*is_temp = 1;
if (!intern->std.properties) {
rebuild_object_properties(&intern->std);
}
debug_info = zend_new_array(zend_hash_num_elements(intern->std.properties) + 1);
zend_hash_copy(debug_info, intern->std.properties, (copy_ctor_func_t) zval_add_ref);
pnstr = spl_gen_private_prop_name(ce, "flags", sizeof("flags")-1);
ZVAL_LONG(&tmp, intern->flags);
zend_hash_update(debug_info, pnstr, &tmp);
zend_string_release(pnstr);
pnstr = spl_gen_private_prop_name(ce, "isCorrupted", sizeof("isCorrupted")-1);
ZVAL_BOOL(&tmp, intern->heap->flags&SPL_HEAP_CORRUPTED);
zend_hash_update(debug_info, pnstr, &tmp);
zend_string_release(pnstr);
array_init(&heap_array);
for (i = 0; i < intern->heap->count; ++i) {
add_index_zval(&heap_array, i, &intern->heap->elements[i]);
if (Z_REFCOUNTED(intern->heap->elements[i])) {
Z_ADDREF(intern->heap->elements[i]);
}
}
pnstr = spl_gen_private_prop_name(ce, "heap", sizeof("heap")-1);
zend_hash_update(debug_info, pnstr, &heap_array);
zend_string_release(pnstr);
return debug_info;
}
/* }}} */
static HashTable *spl_heap_object_get_gc(zval *obj, zval **gc_data, int *gc_data_count) /* {{{ */
{
spl_heap_object *intern = Z_SPLHEAP_P(obj);
*gc_data = intern->heap->elements;
*gc_data_count = intern->heap->count;
return std_object_handlers.get_properties(obj);
}
/* }}} */
static HashTable* spl_heap_object_get_debug_info(zval *obj, int *is_temp) /* {{{ */
{
return spl_heap_object_get_debug_info_helper(spl_ce_SplHeap, obj, is_temp);
}
/* }}} */
static HashTable* spl_pqueue_object_get_debug_info(zval *obj, int *is_temp) /* {{{ */
{
return spl_heap_object_get_debug_info_helper(spl_ce_SplPriorityQueue, obj, is_temp);
}
/* }}} */
/* {{{ proto int SplHeap::count()
Return the number of elements in the heap. */
SPL_METHOD(SplHeap, count)
{
zend_long count;
spl_heap_object *intern = Z_SPLHEAP_P(getThis());
if (zend_parse_parameters_none() == FAILURE) {
return;
}
count = spl_ptr_heap_count(intern->heap);
RETURN_LONG(count);
}
/* }}} */
/* {{{ proto int SplHeap::isEmpty()
Return true if the heap is empty. */
SPL_METHOD(SplHeap, isEmpty)
{
spl_heap_object *intern = Z_SPLHEAP_P(getThis());
if (zend_parse_parameters_none() == FAILURE) {
return;
}
RETURN_BOOL(spl_ptr_heap_count(intern->heap) == 0);
}
/* }}} */
/* {{{ proto bool SplHeap::insert(mixed value)
Push $value on the heap */
SPL_METHOD(SplHeap, insert)
{
zval *value;
spl_heap_object *intern;
if (zend_parse_parameters(ZEND_NUM_ARGS(), "z", &value) == FAILURE) {
return;
}
intern = Z_SPLHEAP_P(getThis());
if (intern->heap->flags & SPL_HEAP_CORRUPTED) {
zend_throw_exception(spl_ce_RuntimeException, "Heap is corrupted, heap properties are no longer ensured.", 0);
return;
}
Z_TRY_ADDREF_P(value);
spl_ptr_heap_insert(intern->heap, value, getThis());
RETURN_TRUE;
}
/* }}} */
/* {{{ proto mixed SplHeap::extract()
extract the element out of the top of the heap */
SPL_METHOD(SplHeap, extract)
{
spl_heap_object *intern;
if (zend_parse_parameters_none() == FAILURE) {
return;
}
intern = Z_SPLHEAP_P(getThis());
if (intern->heap->flags & SPL_HEAP_CORRUPTED) {
zend_throw_exception(spl_ce_RuntimeException, "Heap is corrupted, heap properties are no longer ensured.", 0);
return;
}
spl_ptr_heap_delete_top(intern->heap, return_value, getThis());
if (Z_ISUNDEF_P(return_value)) {
zend_throw_exception(spl_ce_RuntimeException, "Can't extract from an empty heap", 0);
return;
}
}
/* }}} */
/* {{{ proto bool SplPriorityQueue::insert(mixed value, mixed priority)
Push $value with the priority $priodiry on the priorityqueue */
SPL_METHOD(SplPriorityQueue, insert)
{
zval *data, *priority, elem;
spl_heap_object *intern;
if (zend_parse_parameters(ZEND_NUM_ARGS(), "zz", &data, &priority) == FAILURE) {
return;
}
intern = Z_SPLHEAP_P(getThis());
if (intern->heap->flags & SPL_HEAP_CORRUPTED) {
zend_throw_exception(spl_ce_RuntimeException, "Heap is corrupted, heap properties are no longer ensured.", 0);
return;
}
Z_TRY_ADDREF_P(data);
Z_TRY_ADDREF_P(priority);
array_init(&elem);
add_assoc_zval_ex(&elem, "data", sizeof("data") - 1, data);
add_assoc_zval_ex(&elem, "priority", sizeof("priority") - 1, priority);
spl_ptr_heap_insert(intern->heap, &elem, getThis());
RETURN_TRUE;
}
/* }}} */
/* {{{ proto mixed SplPriorityQueue::extract()
extract the element out of the top of the priority queue */
SPL_METHOD(SplPriorityQueue, extract)
{
zval value, *value_out;
spl_heap_object *intern;
if (zend_parse_parameters_none() == FAILURE) {
return;
}
intern = Z_SPLHEAP_P(getThis());
if (intern->heap->flags & SPL_HEAP_CORRUPTED) {
zend_throw_exception(spl_ce_RuntimeException, "Heap is corrupted, heap properties are no longer ensured.", 0);
return;
}
spl_ptr_heap_delete_top(intern->heap, &value, getThis());
if (Z_ISUNDEF(value)) {
zend_throw_exception(spl_ce_RuntimeException, "Can't extract from an empty heap", 0);
return;
}
value_out = spl_pqueue_extract_helper(&value, intern->flags);
if (!value_out) {
zend_error(E_RECOVERABLE_ERROR, "Unable to extract from the PriorityQueue node");
zval_ptr_dtor(&value);
return;
}
ZVAL_DEREF(value_out);
ZVAL_COPY(return_value, value_out);
zval_ptr_dtor(&value);
}
/* }}} */
/* {{{ proto mixed SplPriorityQueue::top()
Peek at the top element of the priority queue */
SPL_METHOD(SplPriorityQueue, top)
{
zval *value, *value_out;
spl_heap_object *intern;
if (zend_parse_parameters_none() == FAILURE) {
return;
}
intern = Z_SPLHEAP_P(getThis());
if (intern->heap->flags & SPL_HEAP_CORRUPTED) {
zend_throw_exception(spl_ce_RuntimeException, "Heap is corrupted, heap properties are no longer ensured.", 0);
return;
}
value = spl_ptr_heap_top(intern->heap);
if (!value) {
zend_throw_exception(spl_ce_RuntimeException, "Can't peek at an empty heap", 0);
return;
}
value_out = spl_pqueue_extract_helper(value, intern->flags);
if (!value_out) {
zend_error(E_RECOVERABLE_ERROR, "Unable to extract from the PriorityQueue node");
return;
}
ZVAL_DEREF(value_out);
ZVAL_COPY(return_value, value_out);
}
/* }}} */
/* {{{ proto int SplPriorityQueue::setExtractFlags(int flags)
Set the flags of extraction*/
SPL_METHOD(SplPriorityQueue, setExtractFlags)
{
zend_long value;
spl_heap_object *intern;
if (zend_parse_parameters(ZEND_NUM_ARGS(), "l", &value) == FAILURE) {
return;
}
intern = Z_SPLHEAP_P(getThis());
intern->flags = value & SPL_PQUEUE_EXTR_MASK;
RETURN_LONG(intern->flags);
}
/* }}} */
/* {{{ proto int SplPriorityQueue::getExtractFlags()
Get the flags of extraction*/
SPL_METHOD(SplPriorityQueue, getExtractFlags)
{
spl_heap_object *intern;
if (zend_parse_parameters_none() == FAILURE) {
return;
}
intern = Z_SPLHEAP_P(getThis());
RETURN_LONG(intern->flags);
}
/* }}} */
/* {{{ proto int SplHeap::recoverFromCorruption()
Recover from a corrupted state*/
SPL_METHOD(SplHeap, recoverFromCorruption)
{
spl_heap_object *intern;
if (zend_parse_parameters_none() == FAILURE) {
return;
}
intern = Z_SPLHEAP_P(getThis());
intern->heap->flags = intern->heap->flags & ~SPL_HEAP_CORRUPTED;
RETURN_TRUE;
}
/* }}} */
/* {{{ proto int SplHeap::isCorrupted()
Tells if the heap is in a corrupted state*/
SPL_METHOD(SplHeap, isCorrupted)
{
spl_heap_object *intern;
if (zend_parse_parameters_none() == FAILURE) {
return;
}
intern = Z_SPLHEAP_P(getThis());
RETURN_BOOL(intern->heap->flags & SPL_HEAP_CORRUPTED);
}
/* }}} */
/* {{{ proto bool SplPriorityQueue::compare(mixed $a, mixed $b)
compare the priorities */
SPL_METHOD(SplPriorityQueue, compare)
{
zval *a, *b;
if (zend_parse_parameters(ZEND_NUM_ARGS(), "zz", &a, &b) == FAILURE) {
return;
}
RETURN_LONG(spl_ptr_heap_zval_max_cmp(a, b, NULL));
}
/* }}} */
/* {{{ proto mixed SplHeap::top()
Peek at the top element of the heap */
SPL_METHOD(SplHeap, top)
{
zval *value;
spl_heap_object *intern;
if (zend_parse_parameters_none() == FAILURE) {
return;
}
intern = Z_SPLHEAP_P(getThis());
if (intern->heap->flags & SPL_HEAP_CORRUPTED) {
zend_throw_exception(spl_ce_RuntimeException, "Heap is corrupted, heap properties are no longer ensured.", 0);
return;
}
value = spl_ptr_heap_top(intern->heap);
if (!value) {
zend_throw_exception(spl_ce_RuntimeException, "Can't peek at an empty heap", 0);
return;
}
ZVAL_DEREF(value);
ZVAL_COPY(return_value, value);
}
/* }}} */
/* {{{ proto bool SplMinHeap::compare(mixed $a, mixed $b)
compare the values */
SPL_METHOD(SplMinHeap, compare)
{
zval *a, *b;
if (zend_parse_parameters(ZEND_NUM_ARGS(), "zz", &a, &b) == FAILURE) {
return;
}
RETURN_LONG(spl_ptr_heap_zval_min_cmp(a, b, NULL));
}
/* }}} */
/* {{{ proto bool SplMaxHeap::compare(mixed $a, mixed $b)
compare the values */
SPL_METHOD(SplMaxHeap, compare)
{
zval *a, *b;
if (zend_parse_parameters(ZEND_NUM_ARGS(), "zz", &a, &b) == FAILURE) {
return;
}
RETURN_LONG(spl_ptr_heap_zval_max_cmp(a, b, NULL));
}
/* }}} */
static void spl_heap_it_dtor(zend_object_iterator *iter) /* {{{ */
{
spl_heap_it *iterator = (spl_heap_it *)iter;
zend_user_it_invalidate_current(iter);
zval_ptr_dtor(&iterator->intern.it.data);
}
/* }}} */
static void spl_heap_it_rewind(zend_object_iterator *iter) /* {{{ */
{
/* do nothing, the iterator always points to the top element */
}
/* }}} */
static int spl_heap_it_valid(zend_object_iterator *iter) /* {{{ */
{
return ((Z_SPLHEAP_P(&iter->data))->heap->count != 0 ? SUCCESS : FAILURE);
}
/* }}} */
static zval *spl_heap_it_get_current_data(zend_object_iterator *iter) /* {{{ */
{
spl_heap_object *object = Z_SPLHEAP_P(&iter->data);
zval *element = &object->heap->elements[0];
if (object->heap->flags & SPL_HEAP_CORRUPTED) {
zend_throw_exception(spl_ce_RuntimeException, "Heap is corrupted, heap properties are no longer ensured.", 0);
return NULL;
}
if (object->heap->count == 0 || Z_ISUNDEF_P(element)) {
return NULL;
} else {
return element;
}
}
/* }}} */
static zval *spl_pqueue_it_get_current_data(zend_object_iterator *iter) /* {{{ */
{
spl_heap_object *object = Z_SPLHEAP_P(&iter->data);
zval *element = &object->heap->elements[0];
if (object->heap->flags & SPL_HEAP_CORRUPTED) {
zend_throw_exception(spl_ce_RuntimeException, "Heap is corrupted, heap properties are no longer ensured.", 0);
return NULL;
}
if (object->heap->count == 0 || Z_ISUNDEF_P(element)) {
return NULL;
} else {
zval *data = spl_pqueue_extract_helper(element, object->flags);
if (!data) {
zend_error(E_RECOVERABLE_ERROR, "Unable to extract from the PriorityQueue node");
}
return data;
}
}
/* }}} */
static void spl_heap_it_get_current_key(zend_object_iterator *iter, zval *key) /* {{{ */
{
spl_heap_object *object = Z_SPLHEAP_P(&iter->data);
ZVAL_LONG(key, object->heap->count - 1);
}
/* }}} */
static void spl_heap_it_move_forward(zend_object_iterator *iter) /* {{{ */
{
spl_heap_object *object = Z_SPLHEAP_P(&iter->data);
zval elem;
if (object->heap->flags & SPL_HEAP_CORRUPTED) {
zend_throw_exception(spl_ce_RuntimeException, "Heap is corrupted, heap properties are no longer ensured.", 0);
return;
}
spl_ptr_heap_delete_top(object->heap, &elem, &iter->data);
zval_ptr_dtor(&elem);
zend_user_it_invalidate_current(iter);
}
/* }}} */
/* {{{ proto int SplHeap::key()
Return current array key */
SPL_METHOD(SplHeap, key)
{
spl_heap_object *intern = Z_SPLHEAP_P(getThis());
if (zend_parse_parameters_none() == FAILURE) {
return;
}
RETURN_LONG(intern->heap->count - 1);
}
/* }}} */
/* {{{ proto void SplHeap::next()
Move to next entry */
SPL_METHOD(SplHeap, next)
{
spl_heap_object *intern = Z_SPLHEAP_P(getThis());
zval elem;
spl_ptr_heap_delete_top(intern->heap, &elem, getThis());
if (zend_parse_parameters_none() == FAILURE) {
return;
}
zval_ptr_dtor(&elem);
}
/* }}} */
/* {{{ proto bool SplHeap::valid()
Check whether the datastructure contains more entries */
SPL_METHOD(SplHeap, valid)
{
spl_heap_object *intern = Z_SPLHEAP_P(getThis());
if (zend_parse_parameters_none() == FAILURE) {
return;
}
RETURN_BOOL(intern->heap->count != 0);