Add m-esr52 at 52.6.0

1 files changed, 342 insertions, 0 deletions

diff --git a/dom/base/nsPropertyTable.cpp b/dom/base/nsPropertyTable.cpp
new file mode 100644
index 000000000..f0f81ba3f
--- /dev/null
+++ b/dom/base/nsPropertyTable.cpp
@@ -0,0 +1,342 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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/.
+ *
+ * This Original Code has been modified by IBM Corporation. Modifications made by IBM 
+ * described herein are Copyright (c) International Business Machines Corporation, 2000.
+ * Modifications to Mozilla code or documentation identified per MPL Section 3.3
+ *
+ * Date             Modified by     Description of modification
+ * 04/20/2000       IBM Corp.      OS/2 VisualAge build.
+ */
+
+/**
+ * nsPropertyTable allows a set of arbitrary key/value pairs to be stored
+ * for any number of nodes, in a global hashtable rather than on the nodes
+ * themselves.  Nodes can be any type of object; the hashtable keys are
+ * nsIAtom pointers, and the values are void pointers.
+ */
+
+#include "nsPropertyTable.h"
+
+#include "mozilla/MemoryReporting.h"
+
+#include "PLDHashTable.h"
+#include "nsError.h"
+#include "nsIAtom.h"
+
+struct PropertyListMapEntry : public PLDHashEntryHdr {
+  const void  *key;
+  void        *value;
+};
+
+//----------------------------------------------------------------------
+
+class nsPropertyTable::PropertyList {
+public:
+  PropertyList(nsIAtom*           aName,
+               NSPropertyDtorFunc aDtorFunc,
+               void*              aDtorData,
+               bool               aTransfer);
+  ~PropertyList();
+
+  // Removes the property associated with the given object, and destroys
+  // the property value
+  bool DeletePropertyFor(nsPropertyOwner aObject);
+
+  // Destroy all remaining properties (without removing them)
+  void Destroy();
+
+  bool Equals(nsIAtom *aPropertyName)
+  {
+    return mName == aPropertyName;
+  }
+
+  size_t SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf);
+
+  nsCOMPtr<nsIAtom>  mName;           // property name
+  PLDHashTable       mObjectValueMap; // map of object/value pairs
+  NSPropertyDtorFunc mDtorFunc;       // property specific value dtor function
+  void*              mDtorData;       // pointer to pass to dtor
+  bool               mTransfer;       // whether to transfer in
+                                      // TransferOrDeleteAllPropertiesFor
+  
+  PropertyList*      mNext;
+};
+
+void
+nsPropertyTable::DeleteAllProperties()
+{
+  while (mPropertyList) {
+    PropertyList* tmp = mPropertyList;
+
+    mPropertyList = mPropertyList->mNext;
+    tmp->Destroy();
+    delete tmp;
+  }
+}
+
+void
+nsPropertyTable::DeleteAllPropertiesFor(nsPropertyOwner aObject)
+{
+  for (PropertyList* prop = mPropertyList; prop; prop = prop->mNext) {
+    prop->DeletePropertyFor(aObject);
+  }
+}
+
+nsresult
+nsPropertyTable::TransferOrDeleteAllPropertiesFor(nsPropertyOwner aObject,
+                                                  nsPropertyTable *aOtherTable)
+{
+  nsresult rv = NS_OK;
+  for (PropertyList* prop = mPropertyList; prop; prop = prop->mNext) {
+    if (prop->mTransfer) {
+      auto entry = static_cast<PropertyListMapEntry*>
+                              (prop->mObjectValueMap.Search(aObject));
+      if (entry) {
+        rv = aOtherTable->SetProperty(aObject, prop->mName,
+                                      entry->value, prop->mDtorFunc,
+                                      prop->mDtorData, prop->mTransfer);
+        if (NS_FAILED(rv)) {
+          DeleteAllPropertiesFor(aObject);
+          aOtherTable->DeleteAllPropertiesFor(aObject);
+
+          break;
+        }
+
+        prop->mObjectValueMap.RemoveEntry(entry);
+      }
+    }
+    else {
+      prop->DeletePropertyFor(aObject);
+    }
+  }
+
+  return rv;
+}
+
+void
+nsPropertyTable::Enumerate(nsPropertyOwner aObject,
+                           NSPropertyFunc aCallback, void *aData)
+{
+  PropertyList* prop;
+  for (prop = mPropertyList; prop; prop = prop->mNext) {
+    auto entry = static_cast<PropertyListMapEntry*>
+                            (prop->mObjectValueMap.Search(aObject));
+    if (entry) {
+      aCallback(const_cast<void*>(aObject.get()), prop->mName, entry->value,
+                aData);
+    }
+  }
+}
+
+void
+nsPropertyTable::EnumerateAll(NSPropertyFunc aCallBack, void* aData)
+{
+  for (PropertyList* prop = mPropertyList; prop; prop = prop->mNext) {
+    for (auto iter = prop->mObjectValueMap.Iter(); !iter.Done(); iter.Next()) {
+      auto entry = static_cast<PropertyListMapEntry*>(iter.Get());
+      aCallBack(const_cast<void*>(entry->key), prop->mName, entry->value,
+                aData);
+    }
+  }
+}
+
+void*
+nsPropertyTable::GetPropertyInternal(nsPropertyOwner aObject,
+                                     nsIAtom    *aPropertyName,
+                                     bool        aRemove,
+                                     nsresult   *aResult)
+{
+  NS_PRECONDITION(aPropertyName && aObject, "unexpected null param");
+  nsresult rv = NS_PROPTABLE_PROP_NOT_THERE;
+  void *propValue = nullptr;
+
+  PropertyList* propertyList = GetPropertyListFor(aPropertyName);
+  if (propertyList) {
+    auto entry = static_cast<PropertyListMapEntry*>
+                            (propertyList->mObjectValueMap.Search(aObject));
+    if (entry) {
+      propValue = entry->value;
+      if (aRemove) {
+        // don't call propertyList->mDtorFunc.  That's the caller's job now.
+        propertyList->mObjectValueMap.RemoveEntry(entry);
+      }
+      rv = NS_OK;
+    }
+  }
+
+  if (aResult)
+    *aResult = rv;
+
+  return propValue;
+}
+
+nsresult
+nsPropertyTable::SetPropertyInternal(nsPropertyOwner     aObject,
+                                     nsIAtom            *aPropertyName,
+                                     void               *aPropertyValue,
+                                     NSPropertyDtorFunc  aPropDtorFunc,
+                                     void               *aPropDtorData,
+                                     bool                aTransfer,
+                                     void              **aOldValue)
+{
+  NS_PRECONDITION(aPropertyName && aObject, "unexpected null param");
+
+  PropertyList* propertyList = GetPropertyListFor(aPropertyName);
+
+  if (propertyList) {
+    // Make sure the dtor function and data and the transfer flag match
+    if (aPropDtorFunc != propertyList->mDtorFunc ||
+        aPropDtorData != propertyList->mDtorData ||
+        aTransfer != propertyList->mTransfer) {
+      NS_WARNING("Destructor/data mismatch while setting property");
+      return NS_ERROR_INVALID_ARG;
+    }
+
+  } else {
+    propertyList = new PropertyList(aPropertyName, aPropDtorFunc,
+                                    aPropDtorData, aTransfer);
+    propertyList->mNext = mPropertyList;
+    mPropertyList = propertyList;
+  }
+
+  // The current property value (if there is one) is replaced and the current
+  // value is destroyed
+  nsresult result = NS_OK;
+  auto entry = static_cast<PropertyListMapEntry*>
+    (propertyList->mObjectValueMap.Add(aObject, mozilla::fallible));
+  if (!entry)
+    return NS_ERROR_OUT_OF_MEMORY;
+  // A nullptr entry->key is the sign that the entry has just been allocated
+  // for us.  If it's non-nullptr then we have an existing entry.
+  if (entry->key) {
+    if (aOldValue)
+      *aOldValue = entry->value;
+    else if (propertyList->mDtorFunc)
+      propertyList->mDtorFunc(const_cast<void*>(entry->key), aPropertyName,
+                              entry->value, propertyList->mDtorData);
+    result = NS_PROPTABLE_PROP_OVERWRITTEN;
+  }
+  else if (aOldValue) {
+    *aOldValue = nullptr;
+  }
+  entry->key = aObject;
+  entry->value = aPropertyValue;
+
+  return result;
+}
+
+nsresult
+nsPropertyTable::DeleteProperty(nsPropertyOwner aObject,
+                                nsIAtom    *aPropertyName)
+{
+  NS_PRECONDITION(aPropertyName && aObject, "unexpected null param");
+
+  PropertyList* propertyList = GetPropertyListFor(aPropertyName);
+  if (propertyList) {
+    if (propertyList->DeletePropertyFor(aObject))
+      return NS_OK;
+  }
+
+  return NS_PROPTABLE_PROP_NOT_THERE;
+}
+
+nsPropertyTable::PropertyList*
+nsPropertyTable::GetPropertyListFor(nsIAtom* aPropertyName) const
+{
+  PropertyList* result;
+
+  for (result = mPropertyList; result; result = result->mNext) {
+    if (result->Equals(aPropertyName)) {
+      break;
+    }
+  }
+
+  return result;
+}
+
+//----------------------------------------------------------------------
+
+nsPropertyTable::PropertyList::PropertyList(nsIAtom            *aName,
+                                            NSPropertyDtorFunc  aDtorFunc,
+                                            void               *aDtorData,
+                                            bool                aTransfer)
+  : mName(aName),
+    mObjectValueMap(PLDHashTable::StubOps(), sizeof(PropertyListMapEntry)),
+    mDtorFunc(aDtorFunc),
+    mDtorData(aDtorData),
+    mTransfer(aTransfer),
+    mNext(nullptr)
+{
+}
+
+nsPropertyTable::PropertyList::~PropertyList()
+{
+}
+
+void
+nsPropertyTable::PropertyList::Destroy()
+{
+  // Enumerate any remaining object/value pairs and destroy the value object.
+  if (mDtorFunc) {
+    for (auto iter = mObjectValueMap.Iter(); !iter.Done(); iter.Next()) {
+      auto entry = static_cast<PropertyListMapEntry*>(iter.Get());
+      mDtorFunc(const_cast<void*>(entry->key), mName, entry->value, mDtorData);
+    }
+  }
+}
+
+bool
+nsPropertyTable::PropertyList::DeletePropertyFor(nsPropertyOwner aObject)
+{
+  auto entry =
+    static_cast<PropertyListMapEntry*>(mObjectValueMap.Search(aObject));
+  if (!entry)
+    return false;
+
+  void* value = entry->value;
+  mObjectValueMap.RemoveEntry(entry);
+
+  if (mDtorFunc)
+    mDtorFunc(const_cast<void*>(aObject.get()), mName, value, mDtorData);
+
+  return true;
+}
+
+size_t
+nsPropertyTable::PropertyList::SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf)
+{
+  size_t n = aMallocSizeOf(this);
+  n += mObjectValueMap.ShallowSizeOfExcludingThis(aMallocSizeOf);
+  return n;
+}
+
+size_t
+nsPropertyTable::SizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf) const
+{
+  size_t n = 0;
+
+  for (PropertyList *prop = mPropertyList; prop; prop = prop->mNext) {
+    n += prop->SizeOfIncludingThis(aMallocSizeOf);
+  }
+
+  return n;
+}
+
+size_t
+nsPropertyTable::SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const
+{
+  return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf);
+}
+
+/* static */
+void
+nsPropertyTable::SupportsDtorFunc(void *aObject, nsIAtom *aPropertyName,
+                                  void *aPropertyValue, void *aData)
+{
+  nsISupports *propertyValue = static_cast<nsISupports*>(aPropertyValue);
+  NS_IF_RELEASE(propertyValue);
+}