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description(
'This test checks if repeated string concatenation causes an exception (and not a crash). From WebKit Bug <a href="http://bugs.webkit.org/show_bug.cgi?id=11131">Repeated string concatenation results in OOM crash</a>.'
);
shouldThrow('s = "a"; while (1) { s += s; }', '"Error: Out of memory"'); // Expand at end of string
shouldThrow('s = "a"; while (1) { s += ("a" + s); }', '"Error: Out of memory"'); // Expand at beginning of string
shouldThrow('s = "a"; while (1) { s = [s, s].join(); }', '"Error: Out of memory"'); // Expand using UString::append.
debug('');
debug(
'We also verify that the the string is stil functional after the out of memory exception is raised. In <a href="rdar://problem/5352887">rdar://problem/5352887</a>, accessing the string after the exception would crash.'
);
function ensureStringIsUsable(testName, stringName, str) {
str[str.length - 1];
try { [str, str].join(str); } catch (o) { }
try { "a" + str; } catch (o) { }
try { str + "a"; } catch (o) { }
debug('PASS: String ' + stringName + ' was functional after ' + testName + ' raised out of memory exception.');
}
var s = "a";
try {
while (1)
s += s; // This will expand the string at the end using UString::expandCapacity
} catch (o) {
ensureStringIsUsable('expandCapacity', 's', s);
}
s = "a";
var t = "";
try {
while (1) {
t = "a" + s;
s += t; // This will expand the string at the beginning using UString::expandPreCapacity
}
} catch (o) {
// Ensure both strings involved are unharmed
ensureStringIsUsable('expandPreCapacity', 's', s);
ensureStringIsUsable('expandPreCapacity', 't', t);
}
delete t;
s = "a";
try {
while (1)
s = [s, s].join(); // This will expand the string using UString::append.
} catch (o) {
ensureStringIsUsable('append', 's', s);
}
var successfullyParsed = true;
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