tor-browser

The Tor Browser
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JSOracleChild.h (1785B)

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