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6982537: Crash in Node*step_through_mergemem

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Reviewed-by: kvn
This commit is contained in:
Tom Rodriguez 2010-09-22 13:01:12 -07:00
parent 0f31511718
commit f4b4eae617
2 changed files with 19 additions and 17 deletions
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11
hotspot/src/share/vm/opto/memnode.cpp
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@ -193,14 +193,15 @@ static Node *step_through_mergemem(PhaseGVN *phase, MergeMemNode *mmem, const T
}
}
#endif
// TypeInstPtr::NOTNULL+any is an OOP with unknown offset - generally
// TypeOopPtr::NOTNULL+any is an OOP with unknown offset - generally
// means an array I have not precisely typed yet. Do not do any
// alias stuff with it any time soon.
const TypeOopPtr *tinst = tp->isa_oopptr();
const TypeOopPtr *toop = tp->isa_oopptr();
if( tp->base() != Type::AnyPtr &&
!(tinst &&
tinst->klass()->is_java_lang_Object() &&
tinst->offset() == Type::OffsetBot) ) {
!(toop &&
toop->klass() != NULL &&
toop->klass()->is_java_lang_Object() &&
toop->offset() == Type::OffsetBot) ) {
// compress paths and change unreachable cycles to TOP
// If not, we can update the input infinitely along a MergeMem cycle
// Equivalent code in PhiNode::Ideal