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diff src/share/vm/classfile/vmSymbols.hpp @ 3249:e1162778c1c8

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7009266: G1: assert(obj->is_oop_or_null(true )) failed: Error Summary: A referent object that is only weakly reachable at the start of concurrent marking but is re-attached to the strongly reachable object graph during marking may not be marked as live. This can cause the reference object to be processed prematurely and leave dangling pointers to the referent object. Implement a read barrier for the java.lang.ref.Reference::referent field by intrinsifying the Reference.get() method, and intercepting accesses though JNI, reflection, and Unsafe, so that when a non-null referent object is read it is also logged in an SATB buffer. Reviewed-by: kvn, iveresov, never, tonyp, dholmes
author johnc
date Thu, 07 Apr 2011 09:53:20 -0700
parents 8033953d67ff
children 5d046bf49ce7
line wrap: on
line diff
--- a/src/share/vm/classfile/vmSymbols.hpp	Tue Apr 05 19:14:03 2011 -0700
+++ b/src/share/vm/classfile/vmSymbols.hpp	Thu Apr 07 09:53:20 2011 -0700
@@ -706,6 +706,10 @@
   do_intrinsic(_checkIndex,               java_nio_Buffer,        checkIndex_name, int_int_signature,            F_R)   \
    do_name(     checkIndex_name,                                 "checkIndex")                                          \
                                                                                                                         \
+  /* java/lang/ref/Reference */                                                                                         \
+  do_intrinsic(_Reference_get,            java_lang_ref_Reference, get_name,    void_object_signature, F_R)             \
+                                                                                                                        \
+                                                                                                                        \
   do_class(sun_misc_AtomicLongCSImpl,     "sun/misc/AtomicLongCSImpl")                                                  \
   do_intrinsic(_get_AtomicLong,           sun_misc_AtomicLongCSImpl, get_name, void_long_signature,              F_R)   \
   /*   (symbols get_name and void_long_signature defined above) */                                                      \