dom/base/JSExecutionUtils.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 /**
   8  * This is not a generated file. It contains common utility functions
   9  * invoked from the JavaScript code generated from IDL interfaces.
  10  * The goal of the utility functions is to cut down on the size of
  11  * the generated code itself.
  12  */
  13
  14 #include "mozilla/dom/JSExecutionUtils.h"
  15
  16 #include <utility>      // std::move
  17 #include "ErrorList.h"  // NS_ERROR_OUT_OF_MEMORY, NS_SUCCESS_DOM_SCRIPT_EVALUATION_THREW, NS_SUCCESS_DOM_SCRIPT_EVALUATION_THREW_UNCATCHABLE
  18 #include "js/CompilationAndEvaluation.h"  // JS::UpdateDebugMetadata
  19 #include "js/experimental/JSStencil.h"  // JS::Stencil, JS::CompileGlobalScriptToStencil
  20 #include "js/SourceText.h"              // JS::SourceText, JS::SourceOwnership
  21 #include "jsapi.h"                      // JS_IsExceptionPending
  22 #include "nsTPromiseFlatString.h"  // PromiseFlatString
  23
  24 #if !defined(DEBUG) && !defined(MOZ_ENABLE_JS_DUMP)
  25 #  include "mozilla/StaticPrefs_browser.h"
  26 #endif
  27
  28 using namespace mozilla;
  29
  30 namespace mozilla::dom {
  31
  32 nsresult EvaluationExceptionToNSResult(ErrorResult& aRv) {
  33   if (aRv.IsJSContextException()) {
  34     aRv.SuppressException();
  35     return NS_SUCCESS_DOM_SCRIPT_EVALUATION_THREW;
  36   }
  37   if (aRv.IsUncatchableException()) {
  38     aRv.SuppressException();
  39     return NS_SUCCESS_DOM_SCRIPT_EVALUATION_THREW_UNCATCHABLE;
  40   }
  41   // cases like NS_OK, NS_ERROR_DOM_JS_DECODING_ERROR and NS_ERROR_OUT_OF_MEMORY
  42   return aRv.StealNSResult();
  43 }
  44
  45 void Compile(JSContext* aCx, JS::CompileOptions& aCompileOptions,
  46              const nsAString& aScript, RefPtr<JS::Stencil>& aStencil,
  47              ErrorResult& aRv) {
  48   const nsPromiseFlatString& flatScript = PromiseFlatString(aScript);
  49   JS::SourceText<char16_t> srcBuf;
  50   if (!srcBuf.init(aCx, flatScript.get(), flatScript.Length(),
  51                    JS::SourceOwnership::Borrowed)) {
  52     aRv.NoteJSContextException(aCx);
  53     return;
  54   }
  55
  56   aStencil = CompileGlobalScriptToStencil(aCx, aCompileOptions, srcBuf);
  57   if (!aStencil) {
  58     aRv.NoteJSContextException(aCx);
  59   }
  60 }
  61
  62 }  // namespace mozilla::dom