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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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4
hotspot/src/share/vm/runtime/arguments.cpp
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@ -1176,9 +1176,7 @@ void Arguments::set_ergonomics_flags() {
// by ergonomics.
if (MaxHeapSize <= max_heap_for_compressed_oops()) {
if (FLAG_IS_DEFAULT(UseCompressedOops)) {
// Leave compressed oops off by default. Uncomment
// the following line to return it to default status.
// FLAG_SET_ERGO(bool, UseCompressedOops, true);
FLAG_SET_ERGO(bool, UseCompressedOops, true);
}
} else {
if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {