src/third_party/mozjs/js/src/jsapi-tests/testValueABI.cpp

/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "tests.h"

/*
 * Bug 689101 - jsval is technically a non-POD type because it has a private
 * data member. On gcc, this doesn't seem to matter. On MSVC, this prevents
 * returning a jsval from a function between C and C++ because it will use a
 * retparam in C++ and a direct return value in C.
 *
 * Bug 712289 - jsval alignment was different on 32-bit platforms between C and
 * C++ because the default alignments of js::Value and jsval_layout differ.
 */

extern "C" {

extern JSBool
C_ValueToObject(JSContext *cx, jsval v, JSObject **obj);

extern jsval
C_GetEmptyStringValue(JSContext *cx);

extern size_t
C_jsvalAlignmentTest();

}

BEGIN_TEST(testValueABI_retparam)
{
    JS::RootedObject obj(cx, JS_GetGlobalForScopeChain(cx));
    jsval v = OBJECT_TO_JSVAL(obj);
    obj = NULL;
    CHECK(C_ValueToObject(cx, v, obj.address()));
    JSBool equal;
    CHECK(JS_StrictlyEqual(cx, v, OBJECT_TO_JSVAL(obj), &equal));
    CHECK(equal);

    v = C_GetEmptyStringValue(cx);
    CHECK(JSVAL_IS_STRING(v));

    return true;
}
END_TEST(testValueABI_retparam)

BEGIN_TEST(testValueABI_alignment)
{
    typedef struct { char c; jsval v; } AlignTest;
    CHECK(C_jsvalAlignmentTest() == sizeof(AlignTest));

    return true;
}
END_TEST(testValueABI_alignment)