void* VectorImpl::_grow(size_t where, size_t amount)
{
// ALOGV("_grow(this=%p, where=%d, amount=%d) count=%d, capacity=%d",
// this, (int)where, (int)amount, (int)mCount, (int)capacity());
ALOG_ASSERT(where <= mCount,
"[%p] _grow: where=%d, amount=%d, count=%d",
this, (int)where, (int)amount, (int)mCount); // caller already checked
const size_t new_size = mCount + amount;
if (capacity() < new_size) {
const size_t new_capacity = max(kMinVectorCapacity, ((new_size*3)+1)/2);
// ALOGV("grow vector %p, new_capacity=%d", this, (int)new_capacity);
if ((mStorage) &&
(mCount==where) &&
(mFlags & HAS_TRIVIAL_COPY) &&
(mFlags & HAS_TRIVIAL_DTOR))
{
const SharedBuffer* cur_sb = SharedBuffer::bufferFromData(mStorage);
SharedBuffer* sb = cur_sb->editResize(new_capacity * mItemSize);
if (sb) {
mStorage = sb->data();
} else {
return NULL;
}
} else {
SharedBuffer* sb = SharedBuffer::alloc(new_capacity * mItemSize);
if (sb) {
void* array = sb->data();
if (where != 0) {
_do_copy(array, mStorage, where);
}
if (where != mCount) {
const void* from = reinterpret_cast<const uint8_t *>(mStorage) + where*mItemSize;
void* dest = reinterpret_cast<uint8_t *>(array) + (where+amount)*mItemSize;
_do_copy(dest, from, mCount-where);
}
release_storage();
mStorage = const_cast<void*>(array);
} else {
return NULL;
}
}
} else {
void* array = editArrayImpl();
if (where != mCount) {
const void* from = reinterpret_cast<const uint8_t *>(array) + where*mItemSize;
void* to = reinterpret_cast<uint8_t *>(array) + (where+amount)*mItemSize;
_do_move_forward(to, from, mCount - where);
}
}
mCount = new_size;
void* free_space = const_cast<void*>(itemLocation(where));
return free_space;
}
void* VectorImpl::_grow(size_t where, size_t amount)
{
// ALOGV("_grow(this=%p, where=%d, amount=%d) count=%d, capacity=%d",
// this, (int)where, (int)amount, (int)mCount, (int)capacity());
ALOG_ASSERT(where <= mCount,
"[%p] _grow: where=%d, amount=%d, count=%d",
this, (int)where, (int)amount, (int)mCount); // caller already checked
size_t new_size;
LOG_ALWAYS_FATAL_IF(!safe_add(&new_size, mCount, amount), "new_size overflow");
if (capacity() < new_size) {
// NOTE: This implementation used to resize vectors as per ((3*x + 1) / 2)
// (sigh..). Also note, the " + 1" was necessary to handle the special case
// where x == 1, where the resized_capacity will be equal to the old
// capacity without the +1. The old calculation wouldn't work properly
// if x was zero.
//
// This approximates the old calculation, using (x + (x/2) + 1) instead.
size_t new_capacity = 0;
LOG_ALWAYS_FATAL_IF(!safe_add(&new_capacity, new_size, (new_size / 2)),
"new_capacity overflow");
LOG_ALWAYS_FATAL_IF(!safe_add(&new_capacity, new_capacity, static_cast<size_t>(1u)),
"new_capacity overflow");
new_capacity = max(kMinVectorCapacity, new_capacity);
size_t new_alloc_size = 0;
LOG_ALWAYS_FATAL_IF(!safe_mul(&new_alloc_size, new_capacity, mItemSize),
"new_alloc_size overflow");
// ALOGV("grow vector %p, new_capacity=%d", this, (int)new_capacity);
if ((mStorage) &&
(mCount==where) &&
(mFlags & HAS_TRIVIAL_COPY) &&
(mFlags & HAS_TRIVIAL_DTOR))
{
const SharedBuffer* cur_sb = SharedBuffer::bufferFromData(mStorage);
SharedBuffer* sb = cur_sb->editResize(new_alloc_size);
if (sb) {
mStorage = sb->data();
} else {
return NULL;
}
} else {
SharedBuffer* sb = SharedBuffer::alloc(new_alloc_size);
if (sb) {
void* array = sb->data();
if (where != 0) {
_do_copy(array, mStorage, where);
}
if (where != mCount) {
const void* from = reinterpret_cast<const uint8_t *>(mStorage) + where*mItemSize;
void* dest = reinterpret_cast<uint8_t *>(array) + (where+amount)*mItemSize;
_do_copy(dest, from, mCount-where);
}
release_storage();
mStorage = const_cast<void*>(array);
} else {
return NULL;
}
}
} else {
void* array = editArrayImpl();
if (where != mCount) {
const void* from = reinterpret_cast<const uint8_t *>(array) + where*mItemSize;
void* to = reinterpret_cast<uint8_t *>(array) + (where+amount)*mItemSize;
_do_move_forward(to, from, mCount - where);
}
}
mCount = new_size;
void* free_space = const_cast<void*>(itemLocation(where));
return free_space;
}
