hg: jdk7/hotspot-gc/hotspot: 7009266: G1: assert(obj->is_oop_or_null(true )) failed: Error

[john.cuthbertson at oracle.com]

Changeset: e1162778c1c8
Author:    johnc
Date:      2011-04-07 09:53 -0700
URL:       http://hg.openjdk.java.net/jdk7/hotspot-gc/hotspot/rev/e1162778c1c8

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

! src/cpu/sparc/vm/assembler_sparc.cpp
! src/cpu/sparc/vm/assembler_sparc.hpp
! src/cpu/sparc/vm/c1_CodeStubs_sparc.cpp
! src/cpu/sparc/vm/c1_LIRGenerator_sparc.cpp
! src/cpu/sparc/vm/cppInterpreter_sparc.cpp
! src/cpu/sparc/vm/interpreterGenerator_sparc.hpp
! src/cpu/sparc/vm/interpreter_sparc.cpp
! src/cpu/sparc/vm/templateInterpreter_sparc.cpp
! src/cpu/sparc/vm/templateTable_sparc.cpp
! src/cpu/x86/vm/assembler_x86.cpp
! src/cpu/x86/vm/assembler_x86.hpp
! src/cpu/x86/vm/c1_CodeStubs_x86.cpp
! src/cpu/x86/vm/c1_LIRGenerator_x86.cpp
! src/cpu/x86/vm/cppInterpreterGenerator_x86.hpp
! src/cpu/x86/vm/cppInterpreter_x86.cpp
! src/cpu/x86/vm/interpreterGenerator_x86.hpp
! src/cpu/x86/vm/templateInterpreter_x86_32.cpp
! src/cpu/x86/vm/templateInterpreter_x86_64.cpp
! src/cpu/x86/vm/templateTable_x86_32.cpp
! src/cpu/x86/vm/templateTable_x86_64.cpp
! src/cpu/zero/vm/cppInterpreter_zero.cpp
! src/cpu/zero/vm/interpreterGenerator_zero.hpp
! src/share/vm/c1/c1_CodeStubs.hpp
! src/share/vm/c1/c1_GraphBuilder.cpp
! src/share/vm/c1/c1_LIRGenerator.cpp
! src/share/vm/c1/c1_LIRGenerator.hpp
! src/share/vm/classfile/vmSymbols.hpp
! src/share/vm/gc_implementation/g1/g1SATBCardTableModRefBS.cpp
! src/share/vm/gc_implementation/g1/g1SATBCardTableModRefBS.hpp
! src/share/vm/gc_implementation/g1/g1_globals.hpp
! src/share/vm/interpreter/abstractInterpreter.hpp
! src/share/vm/interpreter/cppInterpreter.cpp
! src/share/vm/interpreter/interpreter.cpp
! src/share/vm/interpreter/templateInterpreter.cpp
! src/share/vm/oops/instanceKlass.hpp
! src/share/vm/opto/compile.cpp
! src/share/vm/opto/graphKit.cpp
! src/share/vm/opto/graphKit.hpp
! src/share/vm/opto/library_call.cpp
! src/share/vm/prims/jni.cpp
! src/share/vm/prims/unsafe.cpp