Add m-esr52 at 52.6.0

1 files changed, 220 insertions, 0 deletions

diff --git a/xpcom/components/nsNativeModuleLoader.cpp b/xpcom/components/nsNativeModuleLoader.cpp
new file mode 100644
index 000000000..6452f5d1b
--- /dev/null
+++ b/xpcom/components/nsNativeModuleLoader.cpp
@@ -0,0 +1,220 @@
+/* -*- 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.      Added PR_CALLBACK for Optlink use in OS2
+ */
+
+#include "nsNativeModuleLoader.h"
+
+#include "mozilla/Logging.h"
+#include "prinit.h"
+#include "prerror.h"
+
+#include "nsComponentManager.h"
+#include "ManifestParser.h" // for LogMessage
+#include "nsCRTGlue.h"
+#include "nsThreadUtils.h"
+#include "nsTraceRefcnt.h"
+
+#include "nsIFile.h"
+#include "mozilla/WindowsDllBlocklist.h"
+
+#ifdef XP_WIN
+#include <windows.h>
+#endif
+
+#ifdef XP_MACOSX
+#include <signal.h>
+#endif
+
+#ifdef DEBUG
+#define IMPLEMENT_BREAK_AFTER_LOAD
+#endif
+
+using namespace mozilla;
+
+static LazyLogModule sNativeModuleLoaderLog("nsNativeModuleLoader");
+#define LOG(level, args) MOZ_LOG(sNativeModuleLoaderLog, level, args)
+
+nsresult
+nsNativeModuleLoader::Init()
+{
+  MOZ_ASSERT(NS_IsMainThread(), "Startup not on main thread?");
+  LOG(LogLevel::Debug, ("nsNativeModuleLoader::Init()"));
+  return NS_OK;
+}
+
+class LoadModuleMainThreadRunnable : public Runnable
+{
+public:
+  LoadModuleMainThreadRunnable(nsNativeModuleLoader* aLoader,
+                               FileLocation& aFile)
+    : mManager(nsComponentManagerImpl::gComponentManager)
+    , mLoader(aLoader)
+    , mFile(aFile)
+    , mResult(nullptr)
+  {
+  }
+
+  NS_IMETHOD Run() override
+  {
+    mResult = mLoader->LoadModule(mFile);
+    return NS_OK;
+  }
+
+  RefPtr<nsComponentManagerImpl> mManager;
+  nsNativeModuleLoader* mLoader;
+  FileLocation mFile;
+  const mozilla::Module* mResult;
+};
+
+const mozilla::Module*
+nsNativeModuleLoader::LoadModule(FileLocation& aFile)
+{
+  if (aFile.IsZip()) {
+    NS_ERROR("Binary components cannot be loaded from JARs");
+    return nullptr;
+  }
+  nsCOMPtr<nsIFile> file = aFile.GetBaseFile();
+  nsresult rv;
+
+  if (!NS_IsMainThread()) {
+    // If this call is off the main thread, synchronously proxy it
+    // to the main thread.
+    RefPtr<LoadModuleMainThreadRunnable> r =
+      new LoadModuleMainThreadRunnable(this, aFile);
+    NS_DispatchToMainThread(r, NS_DISPATCH_SYNC);
+    return r->mResult;
+  }
+
+  nsCOMPtr<nsIHashable> hashedFile(do_QueryInterface(file));
+  if (!hashedFile) {
+    NS_ERROR("nsIFile is not nsIHashable");
+    return nullptr;
+  }
+
+  nsAutoCString filePath;
+  file->GetNativePath(filePath);
+
+  NativeLoadData data;
+
+  if (mLibraries.Get(hashedFile, &data)) {
+    NS_ASSERTION(data.mModule, "Corrupt mLibraries hash");
+    LOG(LogLevel::Debug,
+        ("nsNativeModuleLoader::LoadModule(\"%s\") - found in cache",
+         filePath.get()));
+    return data.mModule;
+  }
+
+  // We haven't loaded this module before
+  {
+#ifdef HAS_DLL_BLOCKLIST
+    AutoSetXPCOMLoadOnMainThread guard;
+#endif
+    rv = file->Load(&data.mLibrary);
+  }
+
+  if (NS_FAILED(rv)) {
+    char errorMsg[1024] = "<unknown; can't get error from NSPR>";
+
+    if (PR_GetErrorTextLength() < (int)sizeof(errorMsg)) {
+      PR_GetErrorText(errorMsg);
+    }
+
+    LogMessage("Failed to load native module at path '%s': (%lx) %s",
+               filePath.get(), rv, errorMsg);
+
+    return nullptr;
+  }
+
+#ifdef IMPLEMENT_BREAK_AFTER_LOAD
+  nsAutoCString leafName;
+  file->GetNativeLeafName(leafName);
+
+  char* env = getenv("XPCOM_BREAK_ON_LOAD");
+  char* blist;
+  if (env && *env && (blist = strdup(env))) {
+    char* nextTok = blist;
+    while (char* token = NS_strtok(":", &nextTok)) {
+      if (leafName.Find(token, true) != kNotFound) {
+        NS_BREAK();
+      }
+    }
+
+    free(blist);
+  }
+#endif
+
+  void* module = PR_FindSymbol(data.mLibrary, "NSModule");
+  if (!module) {
+    LogMessage("Native module at path '%s' doesn't export symbol `NSModule`.",
+               filePath.get());
+    PR_UnloadLibrary(data.mLibrary);
+    return nullptr;
+  }
+
+  data.mModule = *(mozilla::Module const* const*)module;
+  if (mozilla::Module::kVersion != data.mModule->mVersion) {
+    LogMessage("Native module at path '%s' is incompatible with this version of Firefox, has version %i, expected %i.",
+               filePath.get(), data.mModule->mVersion,
+               mozilla::Module::kVersion);
+    PR_UnloadLibrary(data.mLibrary);
+    return nullptr;
+  }
+
+  mLibraries.Put(hashedFile, data); // infallible
+  return data.mModule;
+}
+
+void
+nsNativeModuleLoader::UnloadLibraries()
+{
+  MOZ_ASSERT(NS_IsMainThread(), "Shutdown not on main thread?");
+
+  for (auto iter = mLibraries.Iter(); !iter.Done(); iter.Next()) {
+    NativeLoadData& loadData = iter.Data();
+    loadData.mModule = nullptr;
+  }
+
+  for (auto iter = mLibraries.Iter(); !iter.Done(); iter.Next()) {
+    if (MOZ_LOG_TEST(sNativeModuleLoaderLog, LogLevel::Debug)) {
+      nsIHashable* hashedFile = iter.Key();
+      nsCOMPtr<nsIFile> file(do_QueryInterface(hashedFile));
+
+      nsAutoCString filePath;
+      file->GetNativePath(filePath);
+
+      LOG(LogLevel::Debug,
+          ("nsNativeModuleLoader::UnloaderFunc(\"%s\")", filePath.get()));
+    }
+
+#ifdef NS_BUILD_REFCNT_LOGGING
+    nsTraceRefcnt::SetActivityIsLegal(false);
+#endif
+
+#if 0
+    // XXXbsmedberg: do this as soon as the static-destructor crash(es)
+    // are fixed
+    NativeLoadData& loadData = iter.Data();
+    PRStatus ret = PR_UnloadLibrary(loadData.mLibrary);
+    NS_ASSERTION(ret == PR_SUCCESS, "Failed to unload library");
+#endif
+
+#ifdef NS_BUILD_REFCNT_LOGGING
+    nsTraceRefcnt::SetActivityIsLegal(true);
+#endif
+
+    iter.Remove();
+  }
+}