1 files changed, 405 insertions, 0 deletions
diff --git a/js/xpconnect/src/XPCMaps.cpp b/js/xpconnect/src/XPCMaps.cpp
new file mode 100644
index 000000000..0d728d7de
--- /dev/null
+++ b/js/xpconnect/src/XPCMaps.cpp
@@ -0,0 +1,405 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* vim: set ts=8 sts=4 et sw=4 tw=99: */
+/* 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/. */
+
+/* Private maps (hashtables). */
+
+#include "mozilla/MathAlgorithms.h"
+#include "mozilla/MemoryReporting.h"
+#include "xpcprivate.h"
+
+#include "js/HashTable.h"
+
+using namespace mozilla;
+
+/***************************************************************************/
+// static shared...
+
+// Note this is returning the bit pattern of the first part of the nsID, not
+// the pointer to the nsID.
+
+static PLDHashNumber
+HashIIDPtrKey(const void* key)
+{
+    return *((js::HashNumber*)key);
+}
+
+static bool
+MatchIIDPtrKey(const PLDHashEntryHdr* entry, const void* key)
+{
+    return ((const nsID*)key)->
+                Equals(*((const nsID*)((PLDHashEntryStub*)entry)->key));
+}
+
+static PLDHashNumber
+HashNativeKey(const void* data)
+{
+    return static_cast<const XPCNativeSetKey*>(data)->Hash();
+}
+
+/***************************************************************************/
+// implement JSObject2WrappedJSMap...
+
+void
+JSObject2WrappedJSMap::UpdateWeakPointersAfterGC(XPCJSContext* context)
+{
+    // Check all wrappers and update their JSObject pointer if it has been
+    // moved. Release any wrappers whose weakly held JSObject has died.
+
+    nsTArray<RefPtr<nsXPCWrappedJS>> dying;
+    for (Map::Enum e(mTable); !e.empty(); e.popFront()) {
+        nsXPCWrappedJS* wrapper = e.front().value();
+        MOZ_ASSERT(wrapper, "found a null JS wrapper!");
+
+        // Walk the wrapper chain and update all JSObjects.
+        while (wrapper) {
+#ifdef DEBUG
+            if (!wrapper->IsSubjectToFinalization()) {
+                // If a wrapper is not subject to finalization then it roots its
+                // JS object.  If so, then it will not be about to be finalized
+                // and any necessary pointer update will have already happened
+                // when it was marked.
+                JSObject* obj = wrapper->GetJSObjectPreserveColor();
+                JSObject* prior = obj;
+                JS_UpdateWeakPointerAfterGCUnbarriered(&obj);
+                MOZ_ASSERT(obj == prior);
+            }
+#endif
+            if (wrapper->IsSubjectToFinalization()) {
+                wrapper->UpdateObjectPointerAfterGC();
+                if (!wrapper->GetJSObjectPreserveColor())
+                    dying.AppendElement(dont_AddRef(wrapper));
+            }
+            wrapper = wrapper->GetNextWrapper();
+        }
+
+        // Remove or update the JSObject key in the table if necessary.
+        JSObject* obj = e.front().key().unbarrieredGet();
+        JS_UpdateWeakPointerAfterGCUnbarriered(&obj);
+        if (!obj)
+            e.removeFront();
+        else
+            e.front().mutableKey() = obj;
+    }
+}
+
+void
+JSObject2WrappedJSMap::ShutdownMarker()
+{
+    for (Map::Range r = mTable.all(); !r.empty(); r.popFront()) {
+        nsXPCWrappedJS* wrapper = r.front().value();
+        MOZ_ASSERT(wrapper, "found a null JS wrapper!");
+        MOZ_ASSERT(wrapper->IsValid(), "found an invalid JS wrapper!");
+        wrapper->SystemIsBeingShutDown();
+    }
+}
+
+size_t
+JSObject2WrappedJSMap::SizeOfIncludingThis(mozilla::MallocSizeOf mallocSizeOf) const
+{
+    size_t n = mallocSizeOf(this);
+    n += mTable.sizeOfExcludingThis(mallocSizeOf);
+    return n;
+}
+
+size_t
+JSObject2WrappedJSMap::SizeOfWrappedJS(mozilla::MallocSizeOf mallocSizeOf) const
+{
+    size_t n = 0;
+    for (Map::Range r = mTable.all(); !r.empty(); r.popFront())
+        n += r.front().value()->SizeOfIncludingThis(mallocSizeOf);
+    return n;
+}
+
+/***************************************************************************/
+// implement Native2WrappedNativeMap...
+
+// static
+Native2WrappedNativeMap*
+Native2WrappedNativeMap::newMap(int length)
+{
+    return new Native2WrappedNativeMap(length);
+}
+
+Native2WrappedNativeMap::Native2WrappedNativeMap(int length)
+  : mTable(PLDHashTable::StubOps(), sizeof(Entry), length)
+{
+}
+
+size_t
+Native2WrappedNativeMap::SizeOfIncludingThis(mozilla::MallocSizeOf mallocSizeOf) const
+{
+    size_t n = mallocSizeOf(this);
+    n += mTable.ShallowSizeOfExcludingThis(mallocSizeOf);
+    for (auto iter = mTable.ConstIter(); !iter.Done(); iter.Next()) {
+        auto entry = static_cast<Native2WrappedNativeMap::Entry*>(iter.Get());
+        n += mallocSizeOf(entry->value);
+    }
+    return n;
+}
+
+/***************************************************************************/
+// implement IID2WrappedJSClassMap...
+
+const struct PLDHashTableOps IID2WrappedJSClassMap::Entry::sOps =
+{
+    HashIIDPtrKey,
+    MatchIIDPtrKey,
+    PLDHashTable::MoveEntryStub,
+    PLDHashTable::ClearEntryStub
+};
+
+// static
+IID2WrappedJSClassMap*
+IID2WrappedJSClassMap::newMap(int length)
+{
+    return new IID2WrappedJSClassMap(length);
+}
+
+IID2WrappedJSClassMap::IID2WrappedJSClassMap(int length)
+  : mTable(&Entry::sOps, sizeof(Entry), length)
+{
+}
+
+/***************************************************************************/
+// implement IID2NativeInterfaceMap...
+
+const struct PLDHashTableOps IID2NativeInterfaceMap::Entry::sOps =
+{
+    HashIIDPtrKey,
+    MatchIIDPtrKey,
+    PLDHashTable::MoveEntryStub,
+    PLDHashTable::ClearEntryStub
+};
+
+// static
+IID2NativeInterfaceMap*
+IID2NativeInterfaceMap::newMap(int length)
+{
+    return new IID2NativeInterfaceMap(length);
+}
+
+IID2NativeInterfaceMap::IID2NativeInterfaceMap(int length)
+  : mTable(&Entry::sOps, sizeof(Entry), length)
+{
+}
+
+size_t
+IID2NativeInterfaceMap::SizeOfIncludingThis(mozilla::MallocSizeOf mallocSizeOf) const
+{
+    size_t n = mallocSizeOf(this);
+    n += mTable.ShallowSizeOfExcludingThis(mallocSizeOf);
+    for (auto iter = mTable.ConstIter(); !iter.Done(); iter.Next()) {
+        auto entry = static_cast<IID2NativeInterfaceMap::Entry*>(iter.Get());
+        n += entry->value->SizeOfIncludingThis(mallocSizeOf);
+    }
+    return n;
+}
+
+/***************************************************************************/
+// implement ClassInfo2NativeSetMap...
+
+// static
+bool ClassInfo2NativeSetMap::Entry::Match(const PLDHashEntryHdr* aEntry,
+                                          const void* aKey)
+{
+    return static_cast<const Entry*>(aEntry)->key == aKey;
+}
+
+// static
+void ClassInfo2NativeSetMap::Entry::Clear(PLDHashTable* aTable,
+                                          PLDHashEntryHdr* aEntry)
+{
+    auto entry = static_cast<Entry*>(aEntry);
+    NS_RELEASE(entry->value);
+
+    entry->key = nullptr;
+    entry->value = nullptr;
+}
+
+const PLDHashTableOps ClassInfo2NativeSetMap::Entry::sOps =
+{
+    PLDHashTable::HashVoidPtrKeyStub,
+    Match,
+    PLDHashTable::MoveEntryStub,
+    Clear,
+    nullptr
+};
+
+// static
+ClassInfo2NativeSetMap*
+ClassInfo2NativeSetMap::newMap(int length)
+{
+    return new ClassInfo2NativeSetMap(length);
+}
+
+ClassInfo2NativeSetMap::ClassInfo2NativeSetMap(int length)
+  : mTable(&ClassInfo2NativeSetMap::Entry::sOps, sizeof(Entry), length)
+{
+}
+
+size_t
+ClassInfo2NativeSetMap::ShallowSizeOfIncludingThis(mozilla::MallocSizeOf mallocSizeOf)
+{
+    size_t n = mallocSizeOf(this);
+    n += mTable.ShallowSizeOfExcludingThis(mallocSizeOf);
+    return n;
+}
+
+/***************************************************************************/
+// implement ClassInfo2WrappedNativeProtoMap...
+
+// static
+ClassInfo2WrappedNativeProtoMap*
+ClassInfo2WrappedNativeProtoMap::newMap(int length)
+{
+    return new ClassInfo2WrappedNativeProtoMap(length);
+}
+
+ClassInfo2WrappedNativeProtoMap::ClassInfo2WrappedNativeProtoMap(int length)
+  : mTable(PLDHashTable::StubOps(), sizeof(Entry), length)
+{
+}
+
+size_t
+ClassInfo2WrappedNativeProtoMap::SizeOfIncludingThis(mozilla::MallocSizeOf mallocSizeOf) const
+{
+    size_t n = mallocSizeOf(this);
+    n += mTable.ShallowSizeOfExcludingThis(mallocSizeOf);
+    for (auto iter = mTable.ConstIter(); !iter.Done(); iter.Next()) {
+        auto entry = static_cast<ClassInfo2WrappedNativeProtoMap::Entry*>(iter.Get());
+        n += mallocSizeOf(entry->value);
+    }
+    return n;
+}
+
+/***************************************************************************/
+// implement NativeSetMap...
+
+bool
+NativeSetMap::Entry::Match(const PLDHashEntryHdr* entry, const void* key)
+{
+    auto Key = static_cast<const XPCNativeSetKey*>(key);
+    XPCNativeSet*       SetInTable = ((Entry*)entry)->key_value;
+    XPCNativeSet*       Set        = Key->GetBaseSet();
+    XPCNativeInterface* Addition   = Key->GetAddition();
+
+    if (!Set) {
+        // This is a special case to deal with the invariant that says:
+        // "All sets have exactly one nsISupports interface and it comes first."
+        // See XPCNativeSet::NewInstance for details.
+        //
+        // Though we might have a key that represents only one interface, we
+        // know that if that one interface were contructed into a set then
+        // it would end up really being a set with two interfaces (except for
+        // the case where the one interface happened to be nsISupports).
+
+        return (SetInTable->GetInterfaceCount() == 1 &&
+                SetInTable->GetInterfaceAt(0) == Addition) ||
+               (SetInTable->GetInterfaceCount() == 2 &&
+                SetInTable->GetInterfaceAt(1) == Addition);
+    }
+
+    if (!Addition && Set == SetInTable)
+        return true;
+
+    uint16_t count = Set->GetInterfaceCount();
+    if (count + (Addition ? 1 : 0) != SetInTable->GetInterfaceCount())
+        return false;
+
+    XPCNativeInterface** CurrentInTable = SetInTable->GetInterfaceArray();
+    XPCNativeInterface** Current = Set->GetInterfaceArray();
+    for (uint16_t i = 0; i < count; i++) {
+        if (*(Current++) != *(CurrentInTable++))
+            return false;
+    }
+    return !Addition || Addition == *(CurrentInTable++);
+}
+
+const struct PLDHashTableOps NativeSetMap::Entry::sOps =
+{
+    HashNativeKey,
+    Match,
+    PLDHashTable::MoveEntryStub,
+    PLDHashTable::ClearEntryStub
+};
+
+// static
+NativeSetMap*
+NativeSetMap::newMap(int length)
+{
+    return new NativeSetMap(length);
+}
+
+NativeSetMap::NativeSetMap(int length)
+  : mTable(&Entry::sOps, sizeof(Entry), length)
+{
+}
+
+size_t
+NativeSetMap::SizeOfIncludingThis(mozilla::MallocSizeOf mallocSizeOf) const
+{
+    size_t n = mallocSizeOf(this);
+    n += mTable.ShallowSizeOfExcludingThis(mallocSizeOf);
+    for (auto iter = mTable.ConstIter(); !iter.Done(); iter.Next()) {
+        auto entry = static_cast<NativeSetMap::Entry*>(iter.Get());
+        n += entry->key_value->SizeOfIncludingThis(mallocSizeOf);
+    }
+    return n;
+}
+
+/***************************************************************************/
+// implement IID2ThisTranslatorMap...
+
+bool
+IID2ThisTranslatorMap::Entry::Match(const PLDHashEntryHdr* entry,
+                                    const void* key)
+{
+    return ((const nsID*)key)->Equals(((Entry*)entry)->key);
+}
+
+void
+IID2ThisTranslatorMap::Entry::Clear(PLDHashTable* table, PLDHashEntryHdr* entry)
+{
+    static_cast<Entry*>(entry)->value = nullptr;
+    memset(entry, 0, table->EntrySize());
+}
+
+const struct PLDHashTableOps IID2ThisTranslatorMap::Entry::sOps =
+{
+    HashIIDPtrKey,
+    Match,
+    PLDHashTable::MoveEntryStub,
+    Clear
+};
+
+// static
+IID2ThisTranslatorMap*
+IID2ThisTranslatorMap::newMap(int length)
+{
+    return new IID2ThisTranslatorMap(length);
+}
+
+IID2ThisTranslatorMap::IID2ThisTranslatorMap(int length)
+  : mTable(&Entry::sOps, sizeof(Entry), length)
+{
+}
+
+/***************************************************************************/
+// implement XPCWrappedNativeProtoMap...
+
+// static
+XPCWrappedNativeProtoMap*
+XPCWrappedNativeProtoMap::newMap(int length)
+{
+    return new XPCWrappedNativeProtoMap(length);
+}
+
+XPCWrappedNativeProtoMap::XPCWrappedNativeProtoMap(int length)
+  : mTable(PLDHashTable::StubOps(), sizeof(PLDHashEntryStub), length)
+{
+}
+
+/***************************************************************************/