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Merge pull request #37373 from reduz/fix-vector-resize

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Ensure COWData does not always reallocate on resize, fixes #22561
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Rémi Verschelde 2020-03-28 16:19:28 +01:00 committed by GitHub
parent 3f7fa93179 0c24a844ec
commit f8cb0a1b3c
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GPG key ID: 4AEE18F83AFDEB23
1 changed files with 24 additions and 17 deletions
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15
core/cowdata.h
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@ -253,7 +253,9 @@ Error CowData<T>::resize(int p_size) {
ERR_FAIL_COND_V(p_size < 0, ERR_INVALID_PARAMETER);
if (p_size == size())
int current_size = size();
if (p_size == current_size)
return OK;
if (p_size == 0) {
@ -266,12 +268,14 @@ Error CowData<T>::resize(int p_size) {
// possibly changing size, copy on write
_copy_on_write();
size_t current_alloc_size = _get_alloc_size(current_size);
size_t alloc_size;
ERR_FAIL_COND_V(!_get_alloc_size_checked(p_size, &alloc_size), ERR_OUT_OF_MEMORY);
if (p_size > size()) {
if (p_size > current_size) {
if (size() == 0) {
if (alloc_size != current_alloc_size) {
if (current_size == 0) {
// alloc from scratch
uint32_t *ptr = (uint32_t *)Memory::alloc_static(alloc_size, true);
ERR_FAIL_COND_V(!ptr, ERR_OUT_OF_MEMORY);
@ -285,6 +289,7 @@ Error CowData<T>::resize(int p_size) {
ERR_FAIL_COND_V(!_ptrnew, ERR_OUT_OF_MEMORY);
_ptr = (T *)(_ptrnew);
}
}
// construct the newly created elements
@ -298,7 +303,7 @@ Error CowData<T>::resize(int p_size) {
*_get_size() = p_size;
} else if (p_size < size()) {
} else if (p_size < current_size) {
if (!__has_trivial_destructor(T)) {
// deinitialize no longer needed elements
@ -308,10 +313,12 @@ Error CowData<T>::resize(int p_size) {
}
}
if (alloc_size != current_alloc_size) {
void *_ptrnew = (T *)Memory::realloc_static(_ptr, alloc_size, true);
ERR_FAIL_COND_V(!_ptrnew, ERR_OUT_OF_MEMORY);
_ptr = (T *)(_ptrnew);
}
*_get_size() = p_size;
}