RFR: 8166188: G1 Needs pre barrier on dereference of weak JNI handles

[Kim Barrett]

> On Feb 15, 2017, at 11:34 AM, Daniel D. Daugherty <daniel.daugherty at oracle.com> wrote:
> 
> On 2/12/17 9:25 PM, Kim Barrett wrote:
>> Here's the updated webrevs, incorporating feedback received so far.
>> 
>> full: http://cr.openjdk.java.net/~kbarrett/8166188/hotspot.05/

Thanks Dan.

> 
> src/share/vm/runtime/javaCalls.hpp
>    No comments.
> 
> src/share/vm/runtime/javaCalls.cpp
>    No comments.
> 
> src/share/vm/runtime/jniHandles.hpp
>    No comments.
> 
> src/share/vm/runtime/jniHandles.cpp
>    No comments.
> 
> src/share/vm/prims/jni.cpp
>    No comments.
> 
> src/share/vm/prims/jvmtiEnv.cpp
>    No comments.
> 
> make/test/JtregNative.gmk
>    No comments.
> 
> src/cpu/aarch64/vm/sharedRuntime_aarch64.cpp
>    No comments.
> 
> src/cpu/aarch64/vm/templateInterpreterGenerator_aarch64.cpp
>    No comments.
> 
> src/cpu/arm/vm/interp_masm_arm.cpp
>    No comments.
> 
> src/cpu/arm/vm/interp_masm_arm.hpp
>    No comments.
> 
> src/cpu/arm/vm/macroAssembler_arm.cpp
>    No comments.
> 
> src/cpu/arm/vm/macroAssembler_arm.hpp
>    No comments.
> 
> src/cpu/arm/vm/sharedRuntime_arm.cpp
>    No comments.
> 
> src/cpu/arm/vm/templateInterpreterGenerator_arm.cpp
>    No comments.
> 
> src/cpu/ppc/vm/frame_ppc.cpp
>    No comments.
> 
> src/cpu/ppc/vm/sharedRuntime_ppc.cpp
>    No comments.
> 
> src/cpu/ppc/vm/templateInterpreterGenerator_ppc.cpp
>    No comments.
> 
> src/cpu/s390/vm/sharedRuntime_s390.cpp
>    No comments.
> 
> src/cpu/s390/vm/templateInterpreterGenerator_s390.cpp
>    No comments.
> 
> src/cpu/sparc/vm/sharedRuntime_sparc.cpp
>    No comments.
> 
> src/cpu/sparc/vm/templateInterpreterGenerator_sparc.cpp
>    No comments.
> 
> src/cpu/x86/vm/macroAssembler_x86.cpp
>    No comments.
> 
> src/cpu/x86/vm/macroAssembler_x86.hpp
>    No comments.
> 
> src/cpu/x86/vm/sharedRuntime_x86_32.cpp
>    No comments.
> 
> src/cpu/x86/vm/sharedRuntime_x86_64.cpp
>    No comments.
> 
> src/cpu/x86/vm/templateInterpreterGenerator_x86.cpp
>    No comments.
> 
> src/cpu/zero/vm/cppInterpreter_zero.cpp
>    No comments.
> 
> src/share/vm/shark/sharkNativeWrapper.cpp
>    No comments.
> 
> test/runtime/jni/CallWithJNIWeak/CallWithJNIWeak.java
>    No comments.
> 
> test/runtime/jni/CallWithJNIWeak/libCallWithJNIWeak.c
>    No comments.
> 
> test/runtime/jni/ReturnJNIWeak/ReturnJNIWeak.java
>    No comments.
> 
> test/runtime/jni/ReturnJNIWeak/libReturnJNIWeak.c
>    No comments.
> 
> Thumbs up!
> 
> Dan
> 
> 
>> incr: http://cr.openjdk.java.net/~kbarrett/8166188/hotspot.05.inc/
>> 
>> For x86 and ARM I added resolve_jobject functions to their respective
>> macroAssembler files, and call those to generate the return object
>> handling code.  Merging the two cases for Sparc is harder and I'm
>> going to leave it to someone else.  I'm also leaving any such merging
>> for other (non-Oracle) ports to their respective maintainers.
>> 
>> Rewrote the error checking in SignatureChekker::check_obj to simplify
>> the control flow and provide more information.  Rather than
>> conditionally selecting between ReportJNIFatalError or assert to
>> report problems, instead just always use guarantee.  Recall that we
>> only get here if CheckJNICalls or in a debug build.  This made
>> SignatureChekker::_thread unused, so removed it.