js/xpconnect/loader/ScriptCacheActors.cpp

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #include "mozilla/ScriptPreloader.h"
   8 #include "ScriptPreloader-inl.h"
   9 #include "mozilla/loader/ScriptCacheActors.h"
  10
  11 #include "mozilla/dom/ContentParent.h"
  12
  13 namespace mozilla {
  14 namespace loader {
  15
  16 void ScriptCacheChild::Init(const Maybe<FileDescriptor>& cacheFile,
  17                             bool wantCacheData) {
  18   mWantCacheData = wantCacheData;
  19
  20   auto& cache = ScriptPreloader::GetChildSingleton();
  21   Unused << cache.InitCache(cacheFile, this);
  22
  23   if (!wantCacheData) {
  24     // If the parent process isn't expecting any cache data from us, we're
  25     // done.
  26     Send__delete__(this, AutoTArray<ScriptData, 0>());
  27   }
  28 }
  29
  30 // Finalize the script cache for the content process, and send back data about
  31 // any scripts executed up to this point.
  32 void ScriptCacheChild::SendScriptsAndFinalize(
  33     ScriptPreloader::ScriptHash& scripts) {
  34   MOZ_ASSERT(mWantCacheData);
  35
  36   AutoSafeJSAPI jsapi;
  37
  38   auto matcher = ScriptPreloader::Match<ScriptPreloader::ScriptStatus::Saved>();
  39
  40   nsTArray<ScriptData> dataArray;
  41   for (auto& script : IterHash(scripts, matcher)) {
  42     if (!script->mSize && !script->XDREncode(jsapi.cx())) {
  43       continue;
  44     }
  45
  46     auto data = dataArray.AppendElement();
  47
  48     data->url() = script->mURL;
  49     data->cachePath() = script->mCachePath;
  50     data->loadTime() = script->mLoadTime;
  51
  52     if (script->HasBuffer()) {
  53       auto& xdrData = script->Buffer();
  54       data->xdrData().AppendElements(xdrData.begin(), xdrData.length());
  55       script->FreeData();
  56     }
  57   }
  58
  59   Send__delete__(this, dataArray);
  60 }
  61
  62 void ScriptCacheChild::ActorDestroy(ActorDestroyReason aWhy) {
  63   auto& cache = ScriptPreloader::GetChildSingleton();
  64   cache.mChildActor = nullptr;
  65 }
  66
  67 IPCResult ScriptCacheParent::Recv__delete__(nsTArray<ScriptData>&& scripts) {
  68   if (!mWantCacheData && scripts.Length()) {
  69     return IPC_FAIL(this, "UnexpectedScriptData");
  70   }
  71
  72   // We don't want any more data from the process at this point.
  73   mWantCacheData = false;
  74
  75   // Merge the child's script data with the parent's.
  76   auto parent = static_cast<dom::ContentParent*>(Manager());
  77   auto processType =
  78       ScriptPreloader::GetChildProcessType(parent->GetRemoteType());
  79
  80   auto& cache = ScriptPreloader::GetChildSingleton();
  81   for (auto& script : scripts) {
  82     cache.NoteStencil(script.url(), script.cachePath(), processType,
  83                       std::move(script.xdrData()), script.loadTime());
  84   }
  85
  86   return IPC_OK();
  87 }
  88
  89 void ScriptCacheParent::ActorDestroy(ActorDestroyReason aWhy) {}
  90
  91 }  // namespace loader
  92 }  // namespace mozilla