stringbuffer-4.js - mozsearch

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// |jit-test| skip-if: !getBuildConfiguration("debug")

// stringRepresentation and the bufferRefCount field aren't available in

// all builds.

gczeal(0);

// Long strings allocated by JSON.parse have a string buffer.

function testJSON() {

    var json = `["${"a".repeat(2000)}"]`;

    var s = JSON.parse(json)[0];

    var repr = JSON.parse(stringRepresentation(s));

    assertEq(repr.flags.includes("HAS_STRING_BUFFER_BIT"), true);

    assertEq(repr.bufferRefCount, 1);

testJSON();

// Long atoms also have a string buffer.

function testAtom() {

    var str = "b".repeat(2000);

    var obj = {[str]: 1};

    var atom = Object.keys(obj)[0];

    var repr = JSON.parse(stringRepresentation(atom));

    assertEq(repr.flags.includes("HAS_STRING_BUFFER_BIT"), true);

    assertEq(repr.bufferRefCount, 1);

testAtom();

// Strings created by js::StringBuffer.

function testJoin() {

    var str = Array(1000).fill("a").join(",");

    var repr = JSON.parse(stringRepresentation(str));

    assertEq(repr.flags.includes("HAS_STRING_BUFFER_BIT"), true);

    assertEq(repr.bufferRefCount, 1);

testJoin();

// Strings created by StringChars.

function testLowerCase() {

    var str = "A".repeat(2000).toLowerCase();

    var repr = JSON.parse(stringRepresentation(str));

    assertEq(repr.flags.includes("HAS_STRING_BUFFER_BIT"), true);

    assertEq(repr.bufferRefCount, 1);

testLowerCase();

function testUpperCase(N) {

    // Use ß to cover reallocation. The initial buffer has the same size as the

    // input string, but because Upper(ß) = SS, the final buffer has twice the

    // size.

    var str = "ß".repeat(N).toUpperCase();

    var repr = JSON.parse(stringRepresentation(str));

    assertEq(repr.flags.includes("HAS_STRING_BUFFER_BIT"), true);

    assertEq(repr.bufferRefCount, 1);

testUpperCase(1000);  // Initial allocation not a string buffer.

testUpperCase(2000);  // Reallocate string buffer.