dom/workers/JSSettings.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 file,
   5  * You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #ifndef mozilla_dom_workerinternals_JSSettings_h
   8 #define mozilla_dom_workerinternals_JSSettings_h
   9
  10 #include <stdint.h>
  11
  12 #include "js/ContextOptions.h"
  13 #include "js/GCAPI.h"
  14 #include "js/RealmOptions.h"
  15 #include "mozilla/Maybe.h"
  16 #include "nsString.h"
  17 #include "nsTArray.h"
  18
  19 namespace mozilla::dom::workerinternals {
  20
  21 // Random unique constant to facilitate JSPrincipal debugging
  22 const uint32_t kJSPrincipalsDebugToken = 0x7e2df9d2;
  23
  24 struct JSSettings {
  25   struct JSGCSetting {
  26     JSGCParamKey key;
  27     // Nothing() represents the default value, the result of calling
  28     // JS_ResetGCParameter.
  29     Maybe<uint32_t> value;
  30
  31     // For the IndexOf call below.
  32     bool operator==(JSGCParamKey k) const { return key == k; }
  33   };
  34
  35   JS::RealmOptions chromeRealmOptions;
  36   JS::RealmOptions contentRealmOptions;
  37   CopyableTArray<JSGCSetting> gcSettings;
  38   JS::ContextOptions contextOptions;
  39
  40 #ifdef JS_GC_ZEAL
  41   uint8_t gcZeal = 0;
  42   uint32_t gcZealFrequency = 0;
  43 #endif
  44
  45   // Returns whether there was a change in the setting.
  46   bool ApplyGCSetting(JSGCParamKey aKey, Maybe<uint32_t> aValue) {
  47     size_t index = gcSettings.IndexOf(aKey);
  48     if (index == gcSettings.NoIndex) {
  49       gcSettings.AppendElement(JSGCSetting{aKey, aValue});
  50       return true;
  51     }
  52     if (gcSettings[index].value != aValue) {
  53       gcSettings[index].value = aValue;
  54       return true;
  55     }
  56     return false;
  57   }
  58 };
  59
  60 }  // namespace mozilla::dom::workerinternals
  61
  62 #endif  // mozilla_dom_workerinternals_JSSettings_h