hg: jdk9/hs/hotspot: 8166188: G1 Needs pre barrier on dereference of weak JNI handles

[kim.barrett at oracle.com]

Changeset: 3bc68ff68250
Author:    kbarrett
Date:      2017-02-15 22:19 -0500
URL:       http://hg.openjdk.java.net/jdk9/hs/hotspot/rev/3bc68ff68250

8166188: G1 Needs pre barrier on dereference of weak JNI handles
Summary: Add low tag to jweaks and G1 barrier for jweak loads.
Reviewed-by: mgerdin, mdoerr, pliden, dlong, dcubed, coleenp, aph, tschatzl
Contributed-by: kim.barrett at oracle.com, martin.doerr at sap.com, volker.simonis at sap.com

! make/test/JtregNative.gmk
! src/cpu/aarch64/vm/sharedRuntime_aarch64.cpp
! src/cpu/aarch64/vm/templateInterpreterGenerator_aarch64.cpp
! src/cpu/arm/vm/interp_masm_arm.cpp
! src/cpu/arm/vm/interp_masm_arm.hpp
! src/cpu/arm/vm/macroAssembler_arm.cpp
! src/cpu/arm/vm/macroAssembler_arm.hpp
! src/cpu/arm/vm/sharedRuntime_arm.cpp
! src/cpu/arm/vm/templateInterpreterGenerator_arm.cpp
! src/cpu/ppc/vm/frame_ppc.cpp
! src/cpu/ppc/vm/macroAssembler_ppc.cpp
! src/cpu/ppc/vm/macroAssembler_ppc.hpp
! src/cpu/ppc/vm/sharedRuntime_ppc.cpp
! src/cpu/ppc/vm/templateInterpreterGenerator_ppc.cpp
! src/cpu/s390/vm/macroAssembler_s390.cpp
! src/cpu/s390/vm/macroAssembler_s390.hpp
! src/cpu/s390/vm/sharedRuntime_s390.cpp
! src/cpu/s390/vm/templateInterpreterGenerator_s390.cpp
! src/cpu/sparc/vm/sharedRuntime_sparc.cpp
! src/cpu/sparc/vm/templateInterpreterGenerator_sparc.cpp
! src/cpu/x86/vm/macroAssembler_x86.cpp
! src/cpu/x86/vm/macroAssembler_x86.hpp
! src/cpu/x86/vm/sharedRuntime_x86_32.cpp
! src/cpu/x86/vm/sharedRuntime_x86_64.cpp
! src/cpu/x86/vm/templateInterpreterGenerator_x86.cpp
! src/cpu/zero/vm/cppInterpreter_zero.cpp
! src/share/vm/prims/jni.cpp
! src/share/vm/prims/jvmtiEnv.cpp
! src/share/vm/runtime/javaCalls.cpp
! src/share/vm/runtime/javaCalls.hpp
! src/share/vm/runtime/jniHandles.cpp
! src/share/vm/runtime/jniHandles.hpp
! src/share/vm/shark/sharkNativeWrapper.cpp
+ test/runtime/jni/CallWithJNIWeak/CallWithJNIWeak.java
+ test/runtime/jni/CallWithJNIWeak/libCallWithJNIWeak.c
+ test/runtime/jni/ReturnJNIWeak/ReturnJNIWeak.java
+ test/runtime/jni/ReturnJNIWeak/libReturnJNIWeak.c