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// Bug 972961 - Test compiler with very long chains of property accesses
// Return true if we can compile a chain of n property accesses,
// false if we cannot. Throw if compilation fails in an unexpected way.
function test(n) {
print("testing " + n);
try {
eval('if (false) {' + Array(n).join(("a.")) + 'a}');
} catch (exc) {
// Expected outcome if the expression is too deeply nested is an InternalError.
if (!(exc instanceof InternalError))
throw exc;
print(exc.message);
return false;
}
print("no exception");
return true;
}
// Find out how long a chain is enough to break the compiler.
var n = 4, LIMIT = 0x000fffff;
var lo = 1, hi = 1;
while (n <= LIMIT && test(n)) {
lo = n;
n *= 4;
}
// Using binary search, find a pass/fail boundary (in order to
// test the edge case).
if (n <= LIMIT) {
hi = n;
while (lo !== hi) {
var mid = Math.floor((lo + hi) / 2);
if (test(mid))
lo = mid + 1;
else
hi = mid;
}
print((lo - 1) + " attributes should be enough for anyone");
}
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