3 template <typename Array> cell array_capacity(const Array* array) {
5 FACTOR_ASSERT(array->type() == Array::type_number);
7 return array->capacity >> TAG_BITS;
10 template <typename Array> cell array_size(cell capacity) {
11 return sizeof(Array) + capacity * Array::element_size;
14 template <typename Array> cell array_size(Array* array) {
15 return array_size<Array>(array_capacity(array));
18 /* Allocates memory */
19 template <typename Array>
20 Array* factor_vm::allot_uninitialized_array(cell capacity) {
21 Array* array = allot<Array>(array_size<Array>(capacity));
22 array->capacity = tag_fixnum(capacity);
26 template <typename Array>
27 bool factor_vm::reallot_array_in_place_p(Array* array, cell capacity) {
28 return nursery.contains_p(array) && capacity <= array_capacity(array);
31 /* Allocates memory (sometimes) */
32 template <typename Array>
33 Array* factor_vm::reallot_array(Array* array_, cell capacity) {
34 data_root<Array> array(array_, this);
36 if (array_capacity(array.untagged()) == capacity)
37 return array.untagged();
39 if (reallot_array_in_place_p(array.untagged(), capacity)) {
40 array->capacity = tag_fixnum(capacity);
41 return array.untagged();
43 cell to_copy = array_capacity(array.untagged());
44 if (capacity < to_copy)
47 Array* new_array = allot_uninitialized_array<Array>(capacity);
49 memcpy(new_array + 1, array.untagged() + 1, to_copy * Array::element_size);
50 memset((char*)(new_array + 1) + to_copy * Array::element_size, 0,
51 (capacity - to_copy) * Array::element_size);