The Tor Browser: xpcom/reflect/xptinfo/src/xptiInterfaceInfoManager.cpp@b8a032363ba2 (annotated)

xpcom/reflect/xptinfo/src/xptiInterfaceInfoManager.cpp@b8a032363ba2 (annotated)

xpcom/reflect/xptinfo/src/xptiInterfaceInfoManager.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: 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/. */
 /* Implementation of xptiInterfaceInfoManager. */
 #include "mozilla/XPTInterfaceInfoManager.h"
 #include "mozilla/FileUtils.h"
 #include "mozilla/MemoryReporting.h"
 #include "mozilla/StaticPtr.h"
 #include "xptiprivate.h"
 #include "nsDependentString.h"
 #include "nsString.h"
 #include "nsISupportsArray.h"
 #include "nsArrayEnumerator.h"
 #include "nsDirectoryService.h"
 #include "nsIMemoryReporter.h"
 using namespace mozilla;
 NS_IMPL_ISUPPORTS(
   XPTInterfaceInfoManager,
   nsIInterfaceInfoManager,
   nsIMemoryReporter)
 static StaticRefPtr<XPTInterfaceInfoManager> gInterfaceInfoManager;
 size_t
 XPTInterfaceInfoManager::SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf)
 {
     size_t n = aMallocSizeOf(this);
     ReentrantMonitorAutoEnter monitor(mWorkingSet.mTableReentrantMonitor);
     // The entries themselves are allocated out of an arena accounted
     // for elsewhere, so don't measure them
     n += mWorkingSet.mIIDTable.SizeOfExcludingThis(nullptr, aMallocSizeOf);
     n += mWorkingSet.mNameTable.SizeOfExcludingThis(nullptr, aMallocSizeOf);
     return n;
 }
 MOZ_DEFINE_MALLOC_SIZE_OF(XPTIMallocSizeOf)
 NS_IMETHODIMP
 XPTInterfaceInfoManager::CollectReports(nsIHandleReportCallback* aHandleReport,
                                         nsISupports* aData)
 {
     size_t amount = SizeOfIncludingThis(XPTIMallocSizeOf);
     // Measure gXPTIStructArena here, too.  This is a bit grotty because it
     // doesn't belong to the XPTIInterfaceInfoManager, but there's no
     // obviously better place to measure it.
     amount += XPT_SizeOfArena(gXPTIStructArena, XPTIMallocSizeOf);
     return MOZ_COLLECT_REPORT(
         "explicit/xpti-working-set", KIND_HEAP, UNITS_BYTES, amount,
         "Memory used by the XPCOM typelib system.");
 }
 // static
 XPTInterfaceInfoManager*
 XPTInterfaceInfoManager::GetSingleton()
 {
     if (!gInterfaceInfoManager) {
         gInterfaceInfoManager = new XPTInterfaceInfoManager();
         gInterfaceInfoManager->InitMemoryReporter();
     }
     return gInterfaceInfoManager;
 }
 void
 XPTInterfaceInfoManager::FreeInterfaceInfoManager()
 {
     gInterfaceInfoManager = nullptr;
 }
 XPTInterfaceInfoManager::XPTInterfaceInfoManager()
     :   mWorkingSet(),
         mResolveLock("XPTInterfaceInfoManager.mResolveLock")
 {
 }
 XPTInterfaceInfoManager::~XPTInterfaceInfoManager()
 {
     // We only do this on shutdown of the service.
     mWorkingSet.InvalidateInterfaceInfos();
     UnregisterWeakMemoryReporter(this);
 }
 void
 XPTInterfaceInfoManager::InitMemoryReporter()
 {
     RegisterWeakMemoryReporter(this);
 }
 void
 XPTInterfaceInfoManager::RegisterBuffer(char *buf, uint32_t length)
 {
     XPTState *state = XPT_NewXDRState(XPT_DECODE, buf, length);
     if (!state)
         return;
     XPTCursor cursor;
     if (!XPT_MakeCursor(state, XPT_HEADER, 0, &cursor)) {
         XPT_DestroyXDRState(state);
         return;
     }
     XPTHeader *header = nullptr;
     if (XPT_DoHeader(gXPTIStructArena, &cursor, &header)) {
         RegisterXPTHeader(header);
     }
     XPT_DestroyXDRState(state);
 }
 void
 XPTInterfaceInfoManager::RegisterXPTHeader(XPTHeader* aHeader)
 {
     if (aHeader->major_version >= XPT_MAJOR_INCOMPATIBLE_VERSION) {
         NS_ASSERTION(!aHeader->num_interfaces,"bad libxpt");
         LOG_AUTOREG(("      file is version %d.%d  Type file of version %d.0 or higher can not be read.\n", (int)header->major_version, (int)header->minor_version, (int)XPT_MAJOR_INCOMPATIBLE_VERSION));
     }
     xptiTypelibGuts* typelib = xptiTypelibGuts::Create(aHeader);
     ReentrantMonitorAutoEnter monitor(mWorkingSet.mTableReentrantMonitor);
     for(uint16_t k = 0; k < aHeader->num_interfaces; k++)
         VerifyAndAddEntryIfNew(aHeader->interface_directory + k, k, typelib);
 }
 void
 XPTInterfaceInfoManager::VerifyAndAddEntryIfNew(XPTInterfaceDirectoryEntry* iface,
                                                 uint16_t idx,
                                                 xptiTypelibGuts* typelib)
 {
     if (!iface->interface_descriptor)
         return;
     // The number of maximum methods is not arbitrary. It is the same value as
     // in xpcom/reflect/xptcall/public/genstubs.pl; do not change this value
     // without changing that one or you WILL see problems.
     if (iface->interface_descriptor->num_methods > 250 &&
             !(XPT_ID_IS_BUILTINCLASS(iface->interface_descriptor->flags))) {
         NS_ASSERTION(0, "Too many methods to handle for the stub, cannot load");
         fprintf(stderr, "ignoring too large interface: %s\n", iface->name);
         return;
     }
     mWorkingSet.mTableReentrantMonitor.AssertCurrentThreadIn();
     xptiInterfaceEntry* entry = mWorkingSet.mIIDTable.Get(iface->iid);
     if (entry) {
         // XXX validate this info to find possible inconsistencies
         LOG_AUTOREG(("      ignoring repeated interface: %s\n", iface->name));
         return;
     }
     // Build a new xptiInterfaceEntry object and hook it up.
     entry = xptiInterfaceEntry::Create(iface->name,
                                        iface->iid,
                                        iface->interface_descriptor,
                                        typelib);
     if (!entry)
         return;
     //XXX  We should SetHeader too as part of the validation, no?
     entry->SetScriptableFlag(XPT_ID_IS_SCRIPTABLE(iface->interface_descriptor->flags));
     entry->SetBuiltinClassFlag(XPT_ID_IS_BUILTINCLASS(iface->interface_descriptor->flags));
     mWorkingSet.mIIDTable.Put(entry->IID(), entry);
     mWorkingSet.mNameTable.Put(entry->GetTheName(), entry);
     typelib->SetEntryAt(idx, entry);
     LOG_AUTOREG(("      added interface: %s\n", iface->name));
 }
 // this is a private helper
 static nsresult
 EntryToInfo(xptiInterfaceEntry* entry, nsIInterfaceInfo **_retval)
 {
     if (!entry) {
         *_retval = nullptr;
         return NS_ERROR_FAILURE;
     }
     nsRefPtr<xptiInterfaceInfo> info = entry->InterfaceInfo();
     info.forget(_retval);
     return NS_OK;
 }
 xptiInterfaceEntry*
 XPTInterfaceInfoManager::GetInterfaceEntryForIID(const nsIID *iid)
 {
     ReentrantMonitorAutoEnter monitor(mWorkingSet.mTableReentrantMonitor);
     return mWorkingSet.mIIDTable.Get(*iid);
 }
 /* nsIInterfaceInfo getInfoForIID (in nsIIDPtr iid); */
 NS_IMETHODIMP
 XPTInterfaceInfoManager::GetInfoForIID(const nsIID * iid, nsIInterfaceInfo **_retval)
 {
     NS_ASSERTION(iid, "bad param");
     NS_ASSERTION(_retval, "bad param");
     ReentrantMonitorAutoEnter monitor(mWorkingSet.mTableReentrantMonitor);
     xptiInterfaceEntry* entry = mWorkingSet.mIIDTable.Get(*iid);
     return EntryToInfo(entry, _retval);
 }
 /* nsIInterfaceInfo getInfoForName (in string name); */
 NS_IMETHODIMP
 XPTInterfaceInfoManager::GetInfoForName(const char *name, nsIInterfaceInfo **_retval)
 {
     NS_ASSERTION(name, "bad param");
     NS_ASSERTION(_retval, "bad param");
     ReentrantMonitorAutoEnter monitor(mWorkingSet.mTableReentrantMonitor);
     xptiInterfaceEntry* entry = mWorkingSet.mNameTable.Get(name);
     return EntryToInfo(entry, _retval);
 }
 /* nsIIDPtr getIIDForName (in string name); */
 NS_IMETHODIMP
 XPTInterfaceInfoManager::GetIIDForName(const char *name, nsIID * *_retval)
 {
     NS_ASSERTION(name, "bad param");
     NS_ASSERTION(_retval, "bad param");
     ReentrantMonitorAutoEnter monitor(mWorkingSet.mTableReentrantMonitor);
     xptiInterfaceEntry* entry = mWorkingSet.mNameTable.Get(name);
     if (!entry) {
         *_retval = nullptr;
         return NS_ERROR_FAILURE;
     }
     return entry->GetIID(_retval);
 }
 /* string getNameForIID (in nsIIDPtr iid); */
 NS_IMETHODIMP
 XPTInterfaceInfoManager::GetNameForIID(const nsIID * iid, char **_retval)
 {
     NS_ASSERTION(iid, "bad param");
     NS_ASSERTION(_retval, "bad param");
     ReentrantMonitorAutoEnter monitor(mWorkingSet.mTableReentrantMonitor);
     xptiInterfaceEntry* entry = mWorkingSet.mIIDTable.Get(*iid);
     if (!entry) {
         *_retval = nullptr;
         return NS_ERROR_FAILURE;
     }
     return entry->GetName(_retval);
 }
 static PLDHashOperator
 xpti_ArrayAppender(const char* name, xptiInterfaceEntry* entry, void* arg)
 {
     nsCOMArray<nsIInterfaceInfo>* array = static_cast<nsCOMArray<nsIInterfaceInfo>*>(arg);
     if (entry->GetScriptableFlag()) {
         nsCOMPtr<nsIInterfaceInfo> ii = entry->InterfaceInfo();
         array->AppendElement(ii);
     }
     return PL_DHASH_NEXT;
 }
 /* nsIEnumerator enumerateInterfaces (); */
 void
 XPTInterfaceInfoManager::GetScriptableInterfaces(nsCOMArray<nsIInterfaceInfo>& aInterfaces)
 {
     // I didn't want to incur the size overhead of using nsHashtable just to
     // make building an enumerator easier. So, this code makes a snapshot of
     // the table using an nsISupportsArray and builds an enumerator for that.
     // We can afford this transient cost.
     ReentrantMonitorAutoEnter monitor(mWorkingSet.mTableReentrantMonitor);
     aInterfaces.SetCapacity(mWorkingSet.mNameTable.Count());
     mWorkingSet.mNameTable.EnumerateRead(xpti_ArrayAppender, &aInterfaces);
 }
 struct ArrayAndPrefix
 {
     nsISupportsArray* array;
     const char*       prefix;
     uint32_t          length;
 };
 static PLDHashOperator
 xpti_ArrayPrefixAppender(const char* keyname, xptiInterfaceEntry* entry, void* arg)
 {
     ArrayAndPrefix* args = (ArrayAndPrefix*) arg;
     const char* name = entry->GetTheName();
     if (name != PL_strnstr(name, args->prefix, args->length))
         return PL_DHASH_NEXT;
     nsCOMPtr<nsIInterfaceInfo> ii;
     if (NS_SUCCEEDED(EntryToInfo(entry, getter_AddRefs(ii))))
         args->array->AppendElement(ii);
     return PL_DHASH_NEXT;
 }
 /* nsIEnumerator enumerateInterfacesWhoseNamesStartWith (in string prefix); */
 NS_IMETHODIMP
 XPTInterfaceInfoManager::EnumerateInterfacesWhoseNamesStartWith(const char *prefix, nsIEnumerator **_retval)
 {
     nsCOMPtr<nsISupportsArray> array;
     NS_NewISupportsArray(getter_AddRefs(array));
     if (!array)
         return NS_ERROR_UNEXPECTED;
     ReentrantMonitorAutoEnter monitor(mWorkingSet.mTableReentrantMonitor);
     ArrayAndPrefix args = {array, prefix, static_cast<uint32_t>(strlen(prefix))};
     mWorkingSet.mNameTable.EnumerateRead(xpti_ArrayPrefixAppender, &args);
     return array->Enumerate(_retval);
 }
 /* void autoRegisterInterfaces (); */
 NS_IMETHODIMP
 XPTInterfaceInfoManager::AutoRegisterInterfaces()
 {
     return NS_ERROR_NOT_IMPLEMENTED;
 }

The Tor Browser / annotate

xpcom/reflect/xptinfo/src/xptiInterfaceInfoManager.cpp@b8a032363ba2 (annotated)

xpcom/reflect/xptinfo/src/xptiInterfaceInfoManager.cpp