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8348562: ZGC: segmentation fault due to missing node type check in barrier elision analysis

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Reviewed-by: rcastanedalo, rrich
This commit is contained in:
Martin Doerr 2025-01-27 10:11:53 +00:00
parent 175e58b2e3
commit afcc2b03af
1 changed files with 3 additions and 1 deletions
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src/hotspot/share/gc/z/c2/zBarrierSetC2.cpp
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@ -558,7 +558,9 @@ static const Node* get_base_and_offset(const MachNode* mach, intptr_t& offset) {
// The memory address is computed by 'base' and fed to 'mach' via an
// indirect memory operand (indicated by offset == 0). The ultimate base and
// offset can be fetched directly from the inputs and Ideal type of 'base'.
offset = base->bottom_type()->isa_oopptr()->offset();
const TypeOopPtr* oopptr = base->bottom_type()->isa_oopptr();
if (oopptr == nullptr) return nullptr;
offset = oopptr->offset();
// Even if 'base' is not an Ideal AddP node anymore, Matcher::ReduceInst()
// guarantees that the base address is still available at the same slot.
base = base->in(AddPNode::Base);