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[ox/ptrarith] Fix NodeBuffer::malloc to correctly update the old last's prev

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This commit is contained in:
Gary Talent
2019-07-17 20:12:28 -05:00
parent ffce1dc4df
commit dc03e01cf8
1 changed files with 14 additions and 8 deletions
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18
deps/ox/src/ox/ptrarith/nodebuffer.hpp vendored
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@@ -242,7 +242,7 @@ typename NodeBuffer<size_t, Item>::ItemPtr NodeBuffer<size_t, Item>::malloc(size
if (last.valid()) {
addr = last.offset() + last.size();
} else {
// there is no first item, so this may be the first item
// there is no first item, so this must be the first item
if (!m_header.firstItem) {
oxTrace("ox::ptrarith::NodeBuffer::malloc") << "No first item, initializing.";
m_header.firstItem = sizeof(m_header);
@@ -255,6 +255,7 @@ typename NodeBuffer<size_t, Item>::ItemPtr NodeBuffer<size_t, Item>::malloc(size
out->setSize(size);
auto first = firstItem();
auto oldLast = last;
out->next = first.offset();
if (first.valid()) {
first->prev = out.offset();
@@ -263,18 +264,22 @@ typename NodeBuffer<size_t, Item>::ItemPtr NodeBuffer<size_t, Item>::malloc(size
return nullptr;
}
auto last = lastItem();
out->prev = last.offset();
if (last.valid()) {
last->next = out.offset();
} else {
if (oldLast.valid()) {
out->prev = oldLast.offset();
oldLast->next = out.offset();
} else { // check to see if this is the first allocation
if (out.offset() != first.offset()) {
// if this is not the first allocation, there should be an oldLast
oxTrace("ox::ptrarith::NodeBuffer::malloc::fail") << "NodeBuffer malloc failed due to invalid last element pointer.";
return nullptr;
}
out->prev = out.offset();
}
m_header.bytesUsed += out.size();
} else {
oxTrace("ox::ptrarith::NodeBuffer::malloc::fail") << "Unknown";
}
oxTrace("ox::ptrarith::NodeBuffer::malloc") << "Offset:" << out.offset();
return out;
}
oxTrace("ox::ptrarith::NodeBuffer::malloc::fail") << "Insufficient space:" << fullSize << "needed," << available() << "available";
@@ -283,6 +288,7 @@ typename NodeBuffer<size_t, Item>::ItemPtr NodeBuffer<size_t, Item>::malloc(size
template<typename size_t, typename Item>
Error NodeBuffer<size_t, Item>::free(ItemPtr item) {
oxTrace("ox::ptrarith::NodeBuffer::free") << "offset:" << item.offset();
auto prev = this->prev(item);
auto next = this->next(item);
if (prev.valid() && next.valid()) {