js/xpconnect/loader/nsImportModule.cpp

   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 "nsImportModule.h"
   8
   9 #include "mozilla/dom/ScriptSettings.h"
  10 #include "mozJSModuleLoader.h"
  11 #include "nsContentUtils.h"
  12 #include "nsExceptionHandler.h"
  13 #include "nsPrintfCString.h"
  14 #include "xpcpublic.h"
  15 #include "xpcprivate.h"
  16 #include "js/PropertyAndElement.h"  // JS_GetProperty
  17
  18 using mozilla::dom::AutoJSAPI;
  19
  20 namespace mozilla {
  21 namespace loader {
  22
  23 static void AnnotateCrashReportWithJSException(JSContext* aCx,
  24                                                const char* aURI) {
  25   JS::RootedValue exn(aCx);
  26   if (JS_GetPendingException(aCx, &exn)) {
  27     JS_ClearPendingException(aCx);
  28
  29     JSAutoRealm ar(aCx, xpc::PrivilegedJunkScope());
  30     JS_WrapValue(aCx, &exn);
  31
  32     nsAutoCString file;
  33     uint32_t line;
  34     uint32_t column;
  35     nsAutoString msg;
  36     nsContentUtils::ExtractErrorValues(aCx, exn, file, &line, &column, msg);
  37
  38     nsPrintfCString errorString("Failed to load module \"%s\": %s:%u:%u: %s",
  39                                 aURI, file.get(), line, column,
  40                                 NS_ConvertUTF16toUTF8(msg).get());
  41
  42     CrashReporter::RecordAnnotationNSCString(
  43         CrashReporter::Annotation::JSModuleLoadError, errorString);
  44   }
  45 }
  46
  47 nsresult ImportESModule(const char* aURI, const char* aExportName,
  48                         const nsIID& aIID, void** aResult, bool aInfallible) {
  49   AutoJSAPI jsapi;
  50   MOZ_ALWAYS_TRUE(jsapi.Init(xpc::PrivilegedJunkScope()));
  51   JSContext* cx = jsapi.cx();
  52
  53   JS::RootedObject moduleNamespace(cx);
  54   nsresult rv = mozJSModuleLoader::Get()->ImportESModule(
  55       cx, nsDependentCString(aURI), &moduleNamespace);
  56   if (NS_WARN_IF(NS_FAILED(rv))) {
  57     if (aInfallible) {
  58       AnnotateCrashReportWithJSException(cx, aURI);
  59
  60       MOZ_CRASH_UNSAFE_PRINTF("Failed to load critical module \"%s\"", aURI);
  61     }
  62     return rv;
  63   }
  64
  65   if (aExportName) {
  66     JS::RootedValue namedExport(cx);
  67     if (!JS_GetProperty(cx, moduleNamespace, aExportName, &namedExport)) {
  68       return NS_ERROR_FAILURE;
  69     }
  70     if (!namedExport.isObject()) {
  71       return NS_ERROR_XPC_BAD_CONVERT_JS;
  72     }
  73     moduleNamespace.set(&namedExport.toObject());
  74   }
  75
  76   return nsXPConnect::XPConnect()->WrapJS(cx, moduleNamespace, aIID, aResult);
  77 }
  78
  79 }  // namespace loader
  80 }  // namespace mozilla