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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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6
hotspot/src/os_cpu/linux_sparc/vm/assembler_linux_sparc.cpp
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@ -27,12 +27,6 @@
#include <asm-sparc/traps.h>
bool MacroAssembler::needs_explicit_null_check(intptr_t offset) {
// Since the linux kernel resides at the low end of
// user address space, no null pointer check is needed.
return offset < 0 || offset >= 0x100000;
}
void MacroAssembler::read_ccr_trap(Register ccr_save) {
// No implementation
breakpoint_trap();