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return only non-negative values from takeHash

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Some broken code implicitly relies on System.identityHashCode always
returning a non-negative number (e.g. old versions of
com/sun/xml/bind/v2/util/CollisionCheckStack.hash).
This commit is contained in:
Joel Dice 2011-03-27 20:22:59 -06:00
parent c75cf7ebb6
commit 62e10cf992
1 changed files with 5 additions and 1 deletions
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6
src/machine.h
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@ -2260,7 +2260,11 @@ markHashTaken(Thread* t, object o)
inline uint32_t
takeHash(Thread*, object o)
{
return reinterpret_cast<uintptr_t>(o) / BytesPerWord;
// some broken code implicitly relies on System.identityHashCode
// always returning a non-negative number (e.g. old versions of
// com/sun/xml/bind/v2/util/CollisionCheckStack.hash), hence the "&
// 0x7FFFFFFF":
return (reinterpret_cast<uintptr_t>(o) / BytesPerWord) & 0x7FFFFFFF;
}
inline uint32_t