mirror of
https://github.com/mozilla/gecko-dev.git
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445 lines
13 KiB
C++
445 lines
13 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "nsScriptNameSpaceManager.h"
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#include "nsCOMPtr.h"
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#include "nsIComponentManager.h"
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#include "nsIComponentRegistrar.h"
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#include "nsICategoryManager.h"
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#include "nsIServiceManager.h"
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#include "nsXPCOM.h"
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#include "nsISupportsPrimitives.h"
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#include "nsIScriptNameSpaceManager.h"
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#include "nsIScriptContext.h"
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#include "nsIInterfaceInfoManager.h"
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#include "nsIInterfaceInfo.h"
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#include "xptinfo.h"
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#include "nsXPIDLString.h"
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#include "nsPrintfCString.h"
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#include "nsReadableUtils.h"
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#include "nsHashKeys.h"
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#include "nsDOMClassInfo.h"
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#include "nsCRT.h"
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#include "nsIObserverService.h"
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#include "nsISimpleEnumerator.h"
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#include "mozilla/dom/BindingUtils.h"
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#include "mozilla/dom/WebIDLGlobalNameHash.h"
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#include "mozilla/MemoryReporting.h"
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#include "mozilla/Preferences.h"
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#include "mozilla/Services.h"
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#define NS_INTERFACE_PREFIX "nsI"
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#define NS_DOM_INTERFACE_PREFIX "nsIDOM"
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using namespace mozilla;
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using namespace mozilla::dom;
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static PLDHashNumber
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GlobalNameHashHashKey(const void *key)
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{
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const nsAString *str = static_cast<const nsAString *>(key);
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return HashString(*str);
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}
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static bool
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GlobalNameHashMatchEntry(const PLDHashEntryHdr *entry, const void *key)
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{
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const GlobalNameMapEntry *e =
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static_cast<const GlobalNameMapEntry *>(entry);
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const nsAString *str = static_cast<const nsAString *>(key);
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return str->Equals(e->mKey);
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}
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static void
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GlobalNameHashClearEntry(PLDHashTable *table, PLDHashEntryHdr *entry)
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{
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GlobalNameMapEntry *e = static_cast<GlobalNameMapEntry *>(entry);
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// An entry is being cleared, let the key (nsString) do its own
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// cleanup.
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e->mKey.~nsString();
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// This will set e->mGlobalName.mType to
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// nsGlobalNameStruct::eTypeNotInitialized
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memset(&e->mGlobalName, 0, sizeof(nsGlobalNameStruct));
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}
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static void
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GlobalNameHashInitEntry(PLDHashEntryHdr *entry, const void *key)
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{
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GlobalNameMapEntry *e = static_cast<GlobalNameMapEntry *>(entry);
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const nsAString *keyStr = static_cast<const nsAString *>(key);
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// Initialize the key in the entry with placement new
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new (&e->mKey) nsString(*keyStr);
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// This will set e->mGlobalName.mType to
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// nsGlobalNameStruct::eTypeNotInitialized
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memset(&e->mGlobalName, 0, sizeof(nsGlobalNameStruct));
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}
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NS_IMPL_ISUPPORTS(
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nsScriptNameSpaceManager,
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nsIObserver,
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nsISupportsWeakReference,
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nsIMemoryReporter)
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static const PLDHashTableOps hash_table_ops =
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{
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GlobalNameHashHashKey,
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GlobalNameHashMatchEntry,
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PLDHashTable::MoveEntryStub,
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GlobalNameHashClearEntry,
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GlobalNameHashInitEntry
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};
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#define GLOBALNAME_HASHTABLE_INITIAL_LENGTH 32
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nsScriptNameSpaceManager::nsScriptNameSpaceManager()
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: mGlobalNames(&hash_table_ops, sizeof(GlobalNameMapEntry),
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GLOBALNAME_HASHTABLE_INITIAL_LENGTH)
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{
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MOZ_COUNT_CTOR(nsScriptNameSpaceManager);
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}
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nsScriptNameSpaceManager::~nsScriptNameSpaceManager()
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{
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UnregisterWeakMemoryReporter(this);
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MOZ_COUNT_DTOR(nsScriptNameSpaceManager);
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}
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nsGlobalNameStruct *
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nsScriptNameSpaceManager::AddToHash(const char *aKey,
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const char16_t **aClassName)
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{
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NS_ConvertASCIItoUTF16 key(aKey);
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auto entry = static_cast<GlobalNameMapEntry*>(mGlobalNames.Add(&key, fallible));
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if (!entry) {
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return nullptr;
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}
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WebIDLGlobalNameHash::Remove(aKey, key.Length());
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if (aClassName) {
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*aClassName = entry->mKey.get();
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}
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return &entry->mGlobalName;
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}
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void
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nsScriptNameSpaceManager::RemoveFromHash(const nsAString *aKey)
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{
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mGlobalNames.Remove(aKey);
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}
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nsresult
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nsScriptNameSpaceManager::FillHash(nsICategoryManager *aCategoryManager,
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const char *aCategory)
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{
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nsCOMPtr<nsISimpleEnumerator> e;
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nsresult rv = aCategoryManager->EnumerateCategory(aCategory,
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getter_AddRefs(e));
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NS_ENSURE_SUCCESS(rv, rv);
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nsCOMPtr<nsISupports> entry;
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while (NS_SUCCEEDED(e->GetNext(getter_AddRefs(entry)))) {
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rv = AddCategoryEntryToHash(aCategoryManager, aCategory, entry);
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if (NS_FAILED(rv)) {
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return rv;
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}
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}
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return NS_OK;
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}
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nsresult
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nsScriptNameSpaceManager::Init()
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{
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RegisterWeakMemoryReporter(this);
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nsresult rv = NS_OK;
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nsCOMPtr<nsICategoryManager> cm =
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do_GetService(NS_CATEGORYMANAGER_CONTRACTID, &rv);
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NS_ENSURE_SUCCESS(rv, rv);
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rv = FillHash(cm, JAVASCRIPT_GLOBAL_CONSTRUCTOR_CATEGORY);
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NS_ENSURE_SUCCESS(rv, rv);
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rv = FillHash(cm, JAVASCRIPT_GLOBAL_PROPERTY_CATEGORY);
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NS_ENSURE_SUCCESS(rv, rv);
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rv = FillHash(cm, JAVASCRIPT_GLOBAL_PRIVILEGED_PROPERTY_CATEGORY);
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NS_ENSURE_SUCCESS(rv, rv);
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// Initial filling of the has table has been done.
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// Now, listen for changes.
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nsCOMPtr<nsIObserverService> serv =
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mozilla::services::GetObserverService();
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if (serv) {
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serv->AddObserver(this, NS_XPCOM_CATEGORY_ENTRY_ADDED_OBSERVER_ID, true);
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serv->AddObserver(this, NS_XPCOM_CATEGORY_ENTRY_REMOVED_OBSERVER_ID, true);
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}
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return NS_OK;
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}
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const nsGlobalNameStruct*
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nsScriptNameSpaceManager::LookupName(const nsAString& aName,
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const char16_t **aClassName)
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{
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auto entry = static_cast<GlobalNameMapEntry*>(mGlobalNames.Search(&aName));
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if (entry) {
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if (aClassName) {
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*aClassName = entry->mKey.get();
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}
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return &entry->mGlobalName;
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}
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if (aClassName) {
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*aClassName = nullptr;
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}
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return nullptr;
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}
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nsresult
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nsScriptNameSpaceManager::RegisterClassName(const char *aClassName,
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int32_t aDOMClassInfoID,
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bool aPrivileged,
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bool aXBLAllowed,
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const char16_t **aResult)
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{
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if (!nsCRT::IsAscii(aClassName)) {
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NS_ERROR("Trying to register a non-ASCII class name");
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return NS_OK;
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}
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nsGlobalNameStruct *s = AddToHash(aClassName, aResult);
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NS_ENSURE_TRUE(s, NS_ERROR_OUT_OF_MEMORY);
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if (s->mType == nsGlobalNameStruct::eTypeClassConstructor) {
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return NS_OK;
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}
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// If a external constructor is already defined with aClassName we
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// won't overwrite it.
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if (s->mType == nsGlobalNameStruct::eTypeExternalConstructor) {
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return NS_OK;
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}
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NS_ASSERTION(s->mType == nsGlobalNameStruct::eTypeNotInitialized,
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"Whaaa, JS environment name clash!");
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s->mType = nsGlobalNameStruct::eTypeClassConstructor;
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s->mDOMClassInfoID = aDOMClassInfoID;
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s->mChromeOnly = aPrivileged;
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s->mAllowXBL = aXBLAllowed;
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return NS_OK;
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}
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nsresult
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nsScriptNameSpaceManager::RegisterClassProto(const char *aClassName,
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const nsIID *aConstructorProtoIID,
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bool *aFoundOld)
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{
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NS_ENSURE_ARG_POINTER(aConstructorProtoIID);
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*aFoundOld = false;
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nsGlobalNameStruct *s = AddToHash(aClassName);
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NS_ENSURE_TRUE(s, NS_ERROR_OUT_OF_MEMORY);
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if (s->mType != nsGlobalNameStruct::eTypeNotInitialized) {
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*aFoundOld = true;
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return NS_OK;
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}
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s->mType = nsGlobalNameStruct::eTypeClassProto;
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s->mIID = *aConstructorProtoIID;
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return NS_OK;
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}
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nsresult
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nsScriptNameSpaceManager::OperateCategoryEntryHash(nsICategoryManager* aCategoryManager,
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const char* aCategory,
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nsISupports* aEntry,
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bool aRemove)
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{
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MOZ_ASSERT(aCategoryManager);
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// Get the type from the category name.
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// NOTE: we could have passed the type in FillHash() and guessed it in
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// Observe() but this way, we have only one place to update and this is
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// not performance sensitive.
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nsGlobalNameStruct::nametype type;
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if (strcmp(aCategory, JAVASCRIPT_GLOBAL_CONSTRUCTOR_CATEGORY) == 0) {
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type = nsGlobalNameStruct::eTypeExternalConstructor;
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} else if (strcmp(aCategory, JAVASCRIPT_GLOBAL_PROPERTY_CATEGORY) == 0 ||
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strcmp(aCategory, JAVASCRIPT_GLOBAL_PRIVILEGED_PROPERTY_CATEGORY) == 0) {
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type = nsGlobalNameStruct::eTypeProperty;
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} else {
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return NS_OK;
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}
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nsCOMPtr<nsISupportsCString> strWrapper = do_QueryInterface(aEntry);
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if (!strWrapper) {
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NS_WARNING("Category entry not an nsISupportsCString!");
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return NS_OK;
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}
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nsAutoCString categoryEntry;
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nsresult rv = strWrapper->GetData(categoryEntry);
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NS_ENSURE_SUCCESS(rv, rv);
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// We need to handle removal before calling GetCategoryEntry
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// because the category entry is already removed before we are
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// notified.
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if (aRemove) {
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NS_ConvertASCIItoUTF16 entry(categoryEntry);
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const nsGlobalNameStruct *s = LookupName(entry);
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// Verify mType so that this API doesn't remove names
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// registered by others.
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if (!s || s->mType != type) {
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return NS_OK;
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}
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RemoveFromHash(&entry);
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return NS_OK;
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}
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nsXPIDLCString contractId;
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rv = aCategoryManager->GetCategoryEntry(aCategory, categoryEntry.get(),
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getter_Copies(contractId));
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NS_ENSURE_SUCCESS(rv, rv);
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if (type == nsGlobalNameStruct::eTypeExternalConstructor) {
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nsPrintfCString prefName("dom.global-constructor.disable.%s",
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categoryEntry.get());
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if (Preferences::GetType(prefName.get()) == nsIPrefBranch::PREF_BOOL &&
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Preferences::GetBool(prefName.get(), false)) {
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return NS_OK;
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}
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}
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nsCOMPtr<nsIComponentRegistrar> registrar;
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rv = NS_GetComponentRegistrar(getter_AddRefs(registrar));
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NS_ENSURE_SUCCESS(rv, rv);
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nsCID *cidPtr;
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rv = registrar->ContractIDToCID(contractId, &cidPtr);
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if (NS_FAILED(rv)) {
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NS_WARNING("Bad contract id registed with the script namespace manager");
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return NS_OK;
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}
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// Copy CID onto the stack, so we can free it right away and avoid having
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// to add cleanup code at every exit point from this function.
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nsCID cid = *cidPtr;
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free(cidPtr);
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nsGlobalNameStruct *s = AddToHash(categoryEntry.get());
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NS_ENSURE_TRUE(s, NS_ERROR_OUT_OF_MEMORY);
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if (s->mType == nsGlobalNameStruct::eTypeNotInitialized) {
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s->mType = type;
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s->mCID = cid;
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s->mChromeOnly =
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strcmp(aCategory, JAVASCRIPT_GLOBAL_PRIVILEGED_PROPERTY_CATEGORY) == 0;
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} else {
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NS_WARNING("Global script name not overwritten!");
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}
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return NS_OK;
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}
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nsresult
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nsScriptNameSpaceManager::AddCategoryEntryToHash(nsICategoryManager* aCategoryManager,
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const char* aCategory,
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nsISupports* aEntry)
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{
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return OperateCategoryEntryHash(aCategoryManager, aCategory, aEntry,
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/* aRemove = */ false);
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}
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nsresult
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nsScriptNameSpaceManager::RemoveCategoryEntryFromHash(nsICategoryManager* aCategoryManager,
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const char* aCategory,
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nsISupports* aEntry)
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{
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return OperateCategoryEntryHash(aCategoryManager, aCategory, aEntry,
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/* aRemove = */ true);
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}
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NS_IMETHODIMP
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nsScriptNameSpaceManager::Observe(nsISupports* aSubject, const char* aTopic,
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const char16_t* aData)
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{
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if (!aData) {
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return NS_OK;
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}
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if (!strcmp(aTopic, NS_XPCOM_CATEGORY_ENTRY_ADDED_OBSERVER_ID)) {
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nsCOMPtr<nsICategoryManager> cm =
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do_GetService(NS_CATEGORYMANAGER_CONTRACTID);
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if (!cm) {
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return NS_OK;
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}
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return AddCategoryEntryToHash(cm, NS_ConvertUTF16toUTF8(aData).get(),
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aSubject);
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} else if (!strcmp(aTopic, NS_XPCOM_CATEGORY_ENTRY_REMOVED_OBSERVER_ID)) {
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nsCOMPtr<nsICategoryManager> cm =
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do_GetService(NS_CATEGORYMANAGER_CONTRACTID);
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if (!cm) {
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return NS_OK;
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}
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return RemoveCategoryEntryFromHash(cm, NS_ConvertUTF16toUTF8(aData).get(),
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aSubject);
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}
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// TODO: we could observe NS_XPCOM_CATEGORY_CLEARED_OBSERVER_ID
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// but we are safe without it. See bug 600460.
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return NS_OK;
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}
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MOZ_DEFINE_MALLOC_SIZE_OF(ScriptNameSpaceManagerMallocSizeOf)
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NS_IMETHODIMP
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nsScriptNameSpaceManager::CollectReports(
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nsIHandleReportCallback* aHandleReport, nsISupports* aData, bool aAnonymize)
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{
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return MOZ_COLLECT_REPORT(
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"explicit/script-namespace-manager", KIND_HEAP, UNITS_BYTES,
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SizeOfIncludingThis(ScriptNameSpaceManagerMallocSizeOf),
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"Memory used for the script namespace manager.");
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}
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size_t
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nsScriptNameSpaceManager::SizeOfIncludingThis(
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mozilla::MallocSizeOf aMallocSizeOf) const
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{
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size_t n = 0;
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n += mGlobalNames.ShallowSizeOfExcludingThis(aMallocSizeOf);
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for (auto iter = mGlobalNames.ConstIter(); !iter.Done(); iter.Next()) {
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auto entry = static_cast<GlobalNameMapEntry*>(iter.Get());
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n += entry->SizeOfExcludingThis(aMallocSizeOf);
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}
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return n;
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}
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