tor-browser

The Tor Browser
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ModuleLoadRequest.cpp (5237B)

      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 "ModuleLoadRequest.h"
      8 
      9 #include "mozilla/DebugOnly.h"
     10 #include "mozilla/HoldDropJSObjects.h"
     11 #include "mozilla/dom/ScriptLoadContext.h"
     12 
     13 #include "LoadedScript.h"
     14 #include "LoadContextBase.h"
     15 #include "ModuleLoaderBase.h"
     16 
     17 namespace JS::loader {
     18 
     19 #undef LOG
     20 #define LOG(args)                                                           \
     21  MOZ_LOG(ModuleLoaderBase::gModuleLoaderBaseLog, mozilla::LogLevel::Debug, \
     22          args)
     23 
     24 NS_IMPL_ISUPPORTS_CYCLE_COLLECTION_INHERITED_0(ModuleLoadRequest,
     25                                               ScriptLoadRequest)
     26 
     27 NS_IMPL_CYCLE_COLLECTION_CLASS(ModuleLoadRequest)
     28 
     29 NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(ModuleLoadRequest,
     30                                                ScriptLoadRequest)
     31  NS_IMPL_CYCLE_COLLECTION_UNLINK(mLoader, mRootModule, mModuleScript)
     32  tmp->ClearImport();
     33 NS_IMPL_CYCLE_COLLECTION_UNLINK_END
     34 
     35 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(ModuleLoadRequest,
     36                                                  ScriptLoadRequest)
     37  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mLoader, mRootModule, mModuleScript)
     38 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
     39 
     40 NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN_INHERITED(ModuleLoadRequest,
     41                                               ScriptLoadRequest)
     42  NS_IMPL_CYCLE_COLLECTION_TRACE_JS_MEMBER_CALLBACK(mReferrerScript)
     43  NS_IMPL_CYCLE_COLLECTION_TRACE_JS_MEMBER_CALLBACK(mModuleRequestObj)
     44  NS_IMPL_CYCLE_COLLECTION_TRACE_JS_MEMBER_CALLBACK(mPayload)
     45 NS_IMPL_CYCLE_COLLECTION_TRACE_END
     46 
     47 ModuleLoadRequest::ModuleLoadRequest(
     48    ModuleType aModuleType, const mozilla::dom::SRIMetadata& aIntegrity,
     49    nsIURI* aReferrer, LoadContextBase* aContext, Kind aKind,
     50    ModuleLoaderBase* aLoader, ModuleLoadRequest* aRootModule)
     51    : ScriptLoadRequest(ScriptKind::eModule, aIntegrity, aReferrer, aContext),
     52      mKind(aKind),
     53      mModuleType(aModuleType),
     54      mIsDynamicImport(aKind == Kind::DynamicImport),
     55      mErroredLoadingImports(false),
     56      mLoader(aLoader),
     57      mRootModule(aRootModule) {
     58  MOZ_ASSERT(mLoader);
     59 }
     60 
     61 ModuleLoadRequest::~ModuleLoadRequest() {
     62  MOZ_ASSERT(!mReferrerScript);
     63  MOZ_ASSERT(!mModuleRequestObj);
     64  MOZ_ASSERT(mPayload.isUndefined());
     65 
     66  DropJSObjects(this);
     67 }
     68 
     69 nsIGlobalObject* ModuleLoadRequest::GetGlobalObject() {
     70  return mLoader->GetGlobalObject();
     71 }
     72 
     73 bool ModuleLoadRequest::IsErrored() const {
     74  return !mModuleScript || mModuleScript->HasParseError();
     75 }
     76 
     77 void ModuleLoadRequest::SetReady() {
     78  MOZ_ASSERT(!IsFinished());
     79 
     80  // Mark a module as ready to execute. This means that this module and all it
     81  // dependencies have had their source loaded, parsed as a module and the
     82  // modules instantiated.
     83 
     84  ScriptLoadRequest::SetReady();
     85 }
     86 
     87 void ModuleLoadRequest::ModuleLoaded() {
     88  // A module that was found to be marked as fetching in the module map has now
     89  // been loaded.
     90 
     91  LOG(("ScriptLoadRequest (%p): Module loaded", this));
     92 
     93  if (IsCanceled()) {
     94    return;
     95  }
     96 
     97  MOZ_ASSERT(IsFetching());
     98 
     99  mModuleScript = mLoader->GetFetchedModule(ModuleMapKey(URI(), mModuleType));
    100 }
    101 
    102 void ModuleLoadRequest::LoadFailed() {
    103  // We failed to load the source text or an error occurred unrelated to the
    104  // content of the module (e.g. OOM).
    105 
    106  LOG(("ScriptLoadRequest (%p): Module load failed", this));
    107 
    108  if (IsCanceled()) {
    109    return;
    110  }
    111 
    112  MOZ_ASSERT(IsFetching());
    113  MOZ_ASSERT(!mModuleScript);
    114 
    115  Cancel();
    116  LoadFinished();
    117 }
    118 
    119 void ModuleLoadRequest::ModuleErrored() {
    120  // Parse error, failure to resolve imported modules or error loading import.
    121 
    122  LOG(("ScriptLoadRequest (%p): Module errored", this));
    123 
    124  if (IsCanceled()) {
    125    return;
    126  }
    127 
    128  MOZ_ASSERT(!IsFinished());
    129 
    130  mozilla::DebugOnly<bool> hasRethrow =
    131      mModuleScript && mModuleScript->HasErrorToRethrow();
    132  MOZ_ASSERT_IF(hasRethrow, !IsDynamicImport());
    133 
    134  // When LoadRequestedModules fails, we will set error to rethrow to the module
    135  // script or call SetErroredLoadingImports() and then call ModuleErrored().
    136  MOZ_ASSERT(IsErrored() || hasRethrow || mErroredLoadingImports);
    137 
    138  if (IsFinished()) {
    139    // Cancelling an outstanding import will error this request.
    140    return;
    141  }
    142 
    143  SetReady();
    144  LoadFinished();
    145 }
    146 
    147 void ModuleLoadRequest::LoadFinished() {
    148  RefPtr<ModuleLoadRequest> request(this);
    149  if (IsDynamicImport()) {
    150    mLoader->RemoveDynamicImport(request);
    151  }
    152 
    153  mLoader->OnModuleLoadComplete(request);
    154 }
    155 
    156 void ModuleLoadRequest::SetImport(Handle<JSScript*> aReferrerScript,
    157                                  Handle<JSObject*> aModuleRequestObj,
    158                                  Handle<Value> aPayload) {
    159  MOZ_ASSERT(mPayload.isUndefined());
    160 
    161  mReferrerScript = aReferrerScript;
    162  mModuleRequestObj = aModuleRequestObj;
    163  mPayload = aPayload;
    164 
    165  mozilla::HoldJSObjects(this);
    166 }
    167 
    168 void ModuleLoadRequest::ClearImport() {
    169  mReferrerScript = nullptr;
    170  mModuleRequestObj = nullptr;
    171  mPayload = UndefinedValue();
    172 }
    173 
    174 }  // namespace JS::loader