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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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();
}
}
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