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6716785: implicit null checks not triggering with CompressedOops

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Allocate alignment-sized page(s) below java heap so that memory accesses at heap_base+1page give signal and cause an implicit null check

Reviewed-by: kvn, jmasa, phh, jcoomes
This commit is contained in:
Coleen Phillimore 2008-07-19 17:38:22 -04:00
parent 575988272e
commit 20dba03e99
23 changed files with 197 additions and 133 deletions
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9
hotspot/src/share/vm/gc_implementation/parallelScavenge/psVirtualspace.cpp
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@ -71,13 +71,8 @@ bool PSVirtualSpace::contains(void* p) const {
void PSVirtualSpace::release() {
DEBUG_ONLY(PSVirtualSpaceVerifier this_verifier(this));
if (reserved_low_addr() != NULL) {
if (special()) {
os::release_memory_special(reserved_low_addr(), reserved_size());
} else {
(void)os::release_memory(reserved_low_addr(), reserved_size());
}
}
// This may not release memory it didn't reserve.
// Use rs.release() to release the underlying memory instead.
_reserved_low_addr = _reserved_high_addr = NULL;
_committed_low_addr = _committed_high_addr = NULL;
_special = false;