js/src/jsapi-tests/testValueABI.cpp

   1 /* This Source Code Form is subject to the terms of the Mozilla Public
   2  * License, v. 2.0. If a copy of the MPL was not distributed with this
   3  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   4
   5 #include "js/GlobalObject.h"
   6 #include "jsapi-tests/tests.h"
   7
   8 /*
   9  * Bug 689101 - jsval is technically a non-POD type because it has a private
  10  * data member. On gcc, this doesn't seem to matter. On MSVC, this prevents
  11  * returning a jsval from a function between C and C++ because it will use a
  12  * retparam in C++ and a direct return value in C.
  13  *
  14  * Bug 712289 - jsval alignment was different on 32-bit platforms between C and
  15  * C++ because the default alignments of js::Value and jsval_layout differ.
  16  */
  17
  18 extern "C" {
  19
  20 extern bool C_ValueToObject(JSContext* cx, jsval v, JSObject** obj);
  21
  22 extern jsval C_GetEmptyStringValue(JSContext* cx);
  23
  24 extern size_t C_jsvalAlignmentTest();
  25 }
  26
  27 BEGIN_TEST(testValueABI_retparam) {
  28   JS::RootedObject obj(cx, JS::CurrentGlobalOrNull(cx));
  29   RootedValue v(cx, ObjectValue(*obj));
  30   obj = nullptr;
  31   CHECK(C_ValueToObject(cx, v, obj.address()));
  32   bool equal;
  33   RootedValue v2(cx, ObjectValue(*obj));
  34   CHECK(JS_StrictlyEqual(cx, v, v2, &equal));
  35   CHECK(equal);
  36
  37   v = C_GetEmptyStringValue(cx);
  38   CHECK(v.isString());
  39
  40   return true;
  41 }
  42 END_TEST(testValueABI_retparam)
  43
  44 BEGIN_TEST(testValueABI_alignment) {
  45   typedef struct {
  46     char c;
  47     jsval v;
  48   } AlignTest;
  49   CHECK(C_jsvalAlignmentTest() == sizeof(AlignTest));
  50
  51   return true;
  52 }
  53 END_TEST(testValueABI_alignment)