The Tor Browser: js/src/jsapi-tests/testExternalStrings.cpp@b8a032363ba2

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

     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/. */

     5 #include "mozilla/ArrayUtils.h"

     6 #include "mozilla/PodOperations.h"

     8 #include "jsapi-tests/tests.h"

    10 using mozilla::ArrayLength;

    11 using mozilla::PodEqual;

    13 static const jschar arr[] = {

    14     'h', 'i', ',', 'd', 'o', 'n', '\'', 't', ' ', 'd', 'e', 'l', 'e', 't', 'e', ' ', 'm', 'e', '\0'

    15 };

    16 static const size_t arrlen = ArrayLength(arr) - 1;

    18 static int finalized1 = 0;

    19 static int finalized2 = 0;

    21 static void

    22 finalize_str(const JSStringFinalizer *fin, jschar *chars);

    24 static const JSStringFinalizer finalizer1 = { finalize_str };

    25 static const JSStringFinalizer finalizer2 = { finalize_str };

    27 static void

    28 finalize_str(const JSStringFinalizer *fin, jschar *chars)

    29 {

    30     if (chars && PodEqual(const_cast<const jschar *>(chars), arr, arrlen)) {

    31         if (fin == &finalizer1) {

    32             ++finalized1;

    33         } else if (fin == &finalizer2) {

    34             ++finalized2;

    35         }

    36     }

    37 }

    39 BEGIN_TEST(testExternalStrings)

    40 {

    41     const unsigned N = 1000;

    43     for (unsigned i = 0; i < N; ++i) {

    44         CHECK(JS_NewExternalString(cx, arr, arrlen, &finalizer1));

    45         CHECK(JS_NewExternalString(cx, arr, arrlen, &finalizer2));

    46     }

    48     // clear that newborn root

    49     JS_NewUCStringCopyN(cx, arr, arrlen);

    51     JS_GC(rt);

    53     // a generous fudge factor to account for strings rooted by conservative gc

    54     const unsigned epsilon = 10;

    56     CHECK((N - finalized1) < epsilon);

    57     CHECK((N - finalized2) < epsilon);

    59     return true;

    60 }

    61 END_TEST(testExternalStrings)

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