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/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "FramePropertyTable.h"
#include "mozilla/MemoryReporting.h"
namespace mozilla {
void
FramePropertyTable::SetInternal(
const nsIFrame* aFrame, UntypedDescriptor aProperty, void* aValue)
{
NS_ASSERTION(aFrame, "Null frame?");
NS_ASSERTION(aProperty, "Null property?");
if (mLastFrame != aFrame || !mLastEntry) {
mLastFrame = aFrame;
mLastEntry = mEntries.PutEntry(aFrame);
}
Entry* entry = mLastEntry;
if (!entry->mProp.IsArray()) {
if (!entry->mProp.mProperty) {
// Empty entry, so we can just store our property in the empty slot
entry->mProp.mProperty = aProperty;
entry->mProp.mValue = aValue;
return;
}
if (entry->mProp.mProperty == aProperty) {
// Just overwrite the current value
entry->mProp.DestroyValueFor(aFrame);
entry->mProp.mValue = aValue;
return;
}
// We need to expand the single current entry to an array
PropertyValue current = entry->mProp;
entry->mProp.mProperty = nullptr;
static_assert(sizeof(nsTArray<PropertyValue>) <= sizeof(void *),
"Property array must fit entirely within entry->mProp.mValue");
new (&entry->mProp.mValue) nsTArray<PropertyValue>(4);
entry->mProp.ToArray()->AppendElement(current);
}
nsTArray<PropertyValue>* array = entry->mProp.ToArray();
nsTArray<PropertyValue>::index_type index =
array->IndexOf(aProperty, 0, PropertyComparator());
if (index != nsTArray<PropertyValue>::NoIndex) {
PropertyValue* pv = &array->ElementAt(index);
pv->DestroyValueFor(aFrame);
pv->mValue = aValue;
return;
}
array->AppendElement(PropertyValue(aProperty, aValue));
}
void*
FramePropertyTable::GetInternal(
const nsIFrame* aFrame, UntypedDescriptor aProperty, bool* aFoundResult)
{
NS_ASSERTION(aFrame, "Null frame?");
NS_ASSERTION(aProperty, "Null property?");
if (aFoundResult) {
*aFoundResult = false;
}
if (mLastFrame != aFrame) {
mLastFrame = aFrame;
mLastEntry = mEntries.GetEntry(mLastFrame);
}
Entry* entry = mLastEntry;
if (!entry)
return nullptr;
if (entry->mProp.mProperty == aProperty) {
if (aFoundResult) {
*aFoundResult = true;
}
return entry->mProp.mValue;
}
if (!entry->mProp.IsArray()) {
// There's just one property and it's not the one we want, bail
return nullptr;
}
nsTArray<PropertyValue>* array = entry->mProp.ToArray();
nsTArray<PropertyValue>::index_type index =
array->IndexOf(aProperty, 0, PropertyComparator());
if (index == nsTArray<PropertyValue>::NoIndex)
return nullptr;
if (aFoundResult) {
*aFoundResult = true;
}
return array->ElementAt(index).mValue;
}
void*
FramePropertyTable::RemoveInternal(
const nsIFrame* aFrame, UntypedDescriptor aProperty, bool* aFoundResult)
{
NS_ASSERTION(aFrame, "Null frame?");
NS_ASSERTION(aProperty, "Null property?");
if (aFoundResult) {
*aFoundResult = false;
}
if (mLastFrame != aFrame) {
mLastFrame = aFrame;
mLastEntry = mEntries.GetEntry(aFrame);
}
Entry* entry = mLastEntry;
if (!entry)
return nullptr;
if (entry->mProp.mProperty == aProperty) {
// There's only one entry and it's the one we want
void* value = entry->mProp.mValue;
// Here it's ok to use RemoveEntry() -- which may resize mEntries --
// because we null mLastEntry at the same time.
mEntries.RemoveEntry(entry);
mLastEntry = nullptr;
if (aFoundResult) {
*aFoundResult = true;
}
return value;
}
if (!entry->mProp.IsArray()) {
// There's just one property and it's not the one we want, bail
return nullptr;
}
nsTArray<PropertyValue>* array = entry->mProp.ToArray();
nsTArray<PropertyValue>::index_type index =
array->IndexOf(aProperty, 0, PropertyComparator());
if (index == nsTArray<PropertyValue>::NoIndex) {
// No such property, bail
return nullptr;
}
if (aFoundResult) {
*aFoundResult = true;
}
void* result = array->ElementAt(index).mValue;
uint32_t last = array->Length() - 1;
array->ElementAt(index) = array->ElementAt(last);
array->RemoveElementAt(last);
if (last == 1) {
PropertyValue pv = array->ElementAt(0);
array->~nsTArray<PropertyValue>();
entry->mProp = pv;
}
return result;
}
void
FramePropertyTable::DeleteInternal(
const nsIFrame* aFrame, UntypedDescriptor aProperty)
{
NS_ASSERTION(aFrame, "Null frame?");
NS_ASSERTION(aProperty, "Null property?");
bool found;
void* v = RemoveInternal(aFrame, aProperty, &found);
if (found) {
PropertyValue pv(aProperty, v);
pv.DestroyValueFor(aFrame);
}
}
/* static */ void
FramePropertyTable::DeleteAllForEntry(Entry* aEntry)
{
if (!aEntry->mProp.IsArray()) {
aEntry->mProp.DestroyValueFor(aEntry->GetKey());
return;
}
nsTArray<PropertyValue>* array = aEntry->mProp.ToArray();
for (uint32_t i = 0; i < array->Length(); ++i) {
array->ElementAt(i).DestroyValueFor(aEntry->GetKey());
}
array->~nsTArray<PropertyValue>();
}
void
FramePropertyTable::DeleteAllFor(const nsIFrame* aFrame)
{
NS_ASSERTION(aFrame, "Null frame?");
Entry* entry = mEntries.GetEntry(aFrame);
if (!entry)
return;
if (mLastFrame == aFrame) {
// Flush cache. We assume DeleteAllForEntry will be called before
// a frame is destroyed.
mLastFrame = nullptr;
mLastEntry = nullptr;
}
DeleteAllForEntry(entry);
// mLastEntry points into mEntries, so we use RawRemoveEntry() which will not
// resize mEntries.
mEntries.RawRemoveEntry(entry);
}
void
FramePropertyTable::DeleteAll()
{
mLastFrame = nullptr;
mLastEntry = nullptr;
for (auto iter = mEntries.Iter(); !iter.Done(); iter.Next()) {
DeleteAllForEntry(iter.Get());
}
mEntries.Clear();
}
size_t
FramePropertyTable::SizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf) const
{
return mEntries.SizeOfExcludingThis(aMallocSizeOf);
}
} // namespace mozilla
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