archive/jdk
1
0
Fork 0
mirror of https://github.com/openjdk/jdk.git synced 2025-09-20 19:14:38 +02:00
Code Issues Projects Releases Packages Wiki Activity Actions

6716785: implicit null checks not triggering with CompressedOops

Browse source 
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
Download patch file Download diff file Expand all files Collapse all files

6
hotspot/src/share/vm/runtime/os.hpp
View file

@ -193,7 +193,11 @@ class os: AllStatic {
static bool commit_memory(char* addr, size_t size, size_t alignment_hint);
static bool uncommit_memory(char* addr, size_t bytes);
static bool release_memory(char* addr, size_t bytes);
static bool protect_memory(char* addr, size_t bytes);
enum ProtType { MEM_PROT_NONE, MEM_PROT_READ, MEM_PROT_RW, MEM_PROT_RWX };
static bool protect_memory(char* addr, size_t bytes, ProtType prot,
bool is_committed = false);
static bool guard_memory(char* addr, size_t bytes);
static bool unguard_memory(char* addr, size_t bytes);
static char* map_memory(int fd, const char* file_name, size_t file_offset,