dom/ipc/JSOracleChild.h

   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 #ifndef mozilla_dom_JSOracleChild
   8 #define mozilla_dom_JSOracleChild
   9
  10 #include "mozilla/dom/PJSOracleChild.h"
  11
  12 #include "js/experimental/JSStencil.h"
  13 #include "js/experimental/CompileScript.h"
  14 #include "js/Initialization.h"
  15 #include "jsapi.h"
  16
  17 namespace mozilla::ipc {
  18 class UtilityProcessParent;
  19 }
  20
  21 namespace mozilla::dom {
  22 struct JSFrontendContextHolder {
  23   JSFrontendContextHolder() {
  24     MOZ_RELEASE_ASSERT(JS_IsInitialized(),
  25                        "UtilityProcessChild::Init should have JS initialized");
  26
  27     mFc = JS::NewFrontendContext();
  28     if (!mFc) {
  29       MOZ_CRASH("Failed to create JS FrontendContext");
  30       return;
  31     }
  32
  33     // See the comment in XPCJSContext::Initialize.
  34     const size_t kDefaultStackQuota = 128 * sizeof(size_t) * 1024;
  35
  36     JS::SetNativeStackQuota(mFc, kDefaultStackQuota);
  37   }
  38
  39   ~JSFrontendContextHolder() {
  40     if (mFc) {
  41       JS::DestroyFrontendContext(mFc);
  42     }
  43   }
  44
  45   static void MaybeInit();
  46
  47   JS::FrontendContext* mFc;
  48 };
  49
  50 class PJSValidatorChild;
  51
  52 class JSOracleChild final : public PJSOracleChild {
  53  public:
  54   NS_INLINE_DECL_THREADSAFE_REFCOUNTING(JSOracleChild, override);
  55
  56   already_AddRefed<PJSValidatorChild> AllocPJSValidatorChild();
  57
  58   void Start(Endpoint<PJSOracleChild>&& aEndpoint);
  59
  60   static JS::FrontendContext* JSFrontendContext();
  61
  62  private:
  63   ~JSOracleChild() = default;
  64
  65   static JSOracleChild* GetSingleton();
  66 };
  67 }  // namespace mozilla::dom
  68
  69 #endif  // defined(mozilla_dom_JSOracleChild)