The Tor Browser: layout/base/FramePropertyTable.cpp@b8a032363ba2 (annotated)

layout/base/FramePropertyTable.cpp@b8a032363ba2 (annotated)

layout/base/FramePropertyTable.cpp

Thu, 22 Jan 2015 13:21:57 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Thu, 22 Jan 2015 13:21:57 +0100
branch: TOR_BUG_9701
changeset 15: b8a032363ba2
permissions: -rw-r--r--

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

 /* -*- 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::Set(nsIFrame* aFrame, const FramePropertyDescriptor* 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::Get(const nsIFrame* aFrame,
                         const FramePropertyDescriptor* aProperty,
                         bool* aFoundResult)
 {
   NS_ASSERTION(aFrame, "Null frame?");
   NS_ASSERTION(aProperty, "Null property?");
   if (aFoundResult) {
     *aFoundResult = false;
   }
   if (mLastFrame != aFrame) {
     mLastFrame = const_cast<nsIFrame*>(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::Remove(nsIFrame* aFrame, const FramePropertyDescriptor* 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;
     mEntries.RawRemoveEntry(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::Delete(nsIFrame* aFrame, const FramePropertyDescriptor* aProperty)
 {
   NS_ASSERTION(aFrame, "Null frame?");
   NS_ASSERTION(aProperty, "Null property?");
   bool found;
   void* v = Remove(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(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);
   mEntries.RawRemoveEntry(entry);
 }
 /* static */ PLDHashOperator
 FramePropertyTable::DeleteEnumerator(Entry* aEntry, void* aArg)
 {
   DeleteAllForEntry(aEntry);
   return PL_DHASH_REMOVE;
 }
 void
 FramePropertyTable::DeleteAll()
 {
   mLastFrame = nullptr;
   mLastEntry = nullptr;
   mEntries.EnumerateEntries(DeleteEnumerator, nullptr);
 }
 size_t
 FramePropertyTable::SizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf) const
 {
   return mEntries.SizeOfExcludingThis(SizeOfPropertyTableEntryExcludingThis,
                                       aMallocSizeOf);
 }
 /* static */ size_t
 FramePropertyTable::SizeOfPropertyTableEntryExcludingThis(Entry* aEntry,
                       mozilla::MallocSizeOf aMallocSizeOf, void *)
 {
   return aEntry->mProp.SizeOfExcludingThis(aMallocSizeOf);
 }
 }

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layout/base/FramePropertyTable.cpp@b8a032363ba2 (annotated)

layout/base/FramePropertyTable.cpp