Line data    Source code

       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 "ModuleScript.h"
       8             : #include "mozilla/HoldDropJSObjects.h"
       9             : #include "ScriptLoader.h"
      10             : 
      11             : namespace mozilla {
      12             : namespace dom {
      13             : 
      14             : // A single module script.  May be used to satisfy multiple load requests.
      15             : 
      16           0 : NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(ModuleScript)
      17           0 : NS_INTERFACE_MAP_END
      18             : 
      19             : NS_IMPL_CYCLE_COLLECTION_CLASS(ModuleScript)
      20             : 
      21           0 : NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(ModuleScript)
      22           0 :   NS_IMPL_CYCLE_COLLECTION_UNLINK(mLoader)
      23           0 :   NS_IMPL_CYCLE_COLLECTION_UNLINK(mBaseURL)
      24           0 :   tmp->UnlinkModuleRecord();
      25           0 : NS_IMPL_CYCLE_COLLECTION_UNLINK_END
      26             : 
      27           0 : NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(ModuleScript)
      28           0 :   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mLoader)
      29           0 : NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
      30             : 
      31           0 : NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(ModuleScript)
      32           0 :   NS_IMPL_CYCLE_COLLECTION_TRACE_JS_MEMBER_CALLBACK(mModuleRecord)
      33           0 :   NS_IMPL_CYCLE_COLLECTION_TRACE_JS_MEMBER_CALLBACK(mException)
      34           0 : NS_IMPL_CYCLE_COLLECTION_TRACE_END
      35             : 
      36           0 : NS_IMPL_CYCLE_COLLECTING_ADDREF(ModuleScript)
      37           0 : NS_IMPL_CYCLE_COLLECTING_RELEASE(ModuleScript)
      38             : 
      39           0 : ModuleScript::ModuleScript(ScriptLoader* aLoader, nsIURI* aBaseURL,
      40           0 :                            JS::Handle<JSObject*> aModuleRecord)
      41             :  : mLoader(aLoader),
      42             :    mBaseURL(aBaseURL),
      43             :    mModuleRecord(aModuleRecord),
      44           0 :    mInstantiationState(Uninstantiated)
      45             : {
      46           0 :   MOZ_ASSERT(mLoader);
      47           0 :   MOZ_ASSERT(mBaseURL);
      48           0 :   MOZ_ASSERT(mModuleRecord);
      49           0 :   MOZ_ASSERT(mException.isUndefined());
      50             : 
      51             :   // Make module's host defined field point to this module script object.
      52             :   // This is cleared in the UnlinkModuleRecord().
      53           0 :   JS::SetModuleHostDefinedField(mModuleRecord, JS::PrivateValue(this));
      54           0 :   HoldJSObjects(this);
      55           0 : }
      56             : 
      57             : void
      58           0 : ModuleScript::UnlinkModuleRecord()
      59             : {
      60             :   // Remove module's back reference to this object request if present.
      61           0 :   if (mModuleRecord) {
      62           0 :     MOZ_ASSERT(JS::GetModuleHostDefinedField(mModuleRecord).toPrivate() ==
      63             :                this);
      64           0 :     JS::SetModuleHostDefinedField(mModuleRecord, JS::UndefinedValue());
      65             :   }
      66           0 :   mModuleRecord = nullptr;
      67           0 :   mException.setUndefined();
      68           0 : }
      69             : 
      70           0 : ModuleScript::~ModuleScript()
      71             : {
      72           0 :   if (mModuleRecord) {
      73             :     // The object may be destroyed without being unlinked first.
      74           0 :     UnlinkModuleRecord();
      75             :   }
      76           0 :   DropJSObjects(this);
      77           0 : }
      78             : 
      79             : void
      80           0 : ModuleScript::SetInstantiationResult(JS::Handle<JS::Value> aMaybeException)
      81             : {
      82           0 :   MOZ_ASSERT(mInstantiationState == Uninstantiated);
      83           0 :   MOZ_ASSERT(mModuleRecord);
      84           0 :   MOZ_ASSERT(mException.isUndefined());
      85             : 
      86           0 :   if (aMaybeException.isUndefined()) {
      87           0 :     mInstantiationState = Instantiated;
      88             :   } else {
      89           0 :     mModuleRecord = nullptr;
      90           0 :     mException = aMaybeException;
      91           0 :     mInstantiationState = Errored;
      92             :   }
      93           0 : }
      94             : 
      95             : } // dom namespace
      96             : } // mozilla namespace