Mercurial > hg > truffle

changeset 9974:01dd93600d02

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Add comments in unsafe access of uncompressed pointers
author Christos Kotselidis <christos.kotselidis@oracle.com>
date Mon, 10 Jun 2013 12:18:36 +0200
parents 80cff15f7721
children 3743ac6347dd
files src/share/vm/prims/unsafe.cpp
diffstat 1 files changed, 2 insertions(+), 0 deletions(-) [+]
line wrap: on
line diff
--- a/src/share/vm/prims/unsafe.cpp	Mon Jun 10 12:11:47 2013 +0200
+++ b/src/share/vm/prims/unsafe.cpp	Mon Jun 10 12:18:36 2013 +0200
@@ -188,6 +188,8 @@
 #define GET_OOP_FIELD(obj, offset, v) \
    oop p = JNIHandles::resolve(obj); \
    oop v; \
+   /* Uncompression is not performed to unsafeAccess with null object.
+    * This concerns accesses to the metaspace such as the classMirrorOffset which is not compressed.*/ \
    if (UseCompressedOops && p!=NULL && offset>=oopDesc::header_size()) { \
      narrowOop n = *(narrowOop*)index_oop_from_field_offset_long(p, offset); \
      v = oopDesc::decode_heap_oop(n); \