Just debugged a crash where the VM goes to _thread_in_Java before passing the arguments.  When passing the arguments to call_stub, a bad oop causes a crash which leads to the catchall error message because the thread is in java.  We should move this above the
thread transition in javaCalls.cpp :  args->parameters().

Also -Xcheck:jni should catch the non oop argument but doesn't check arguments.

os_<platform>.cpp should not call SharedRuntime::continuation_for_implicit_exception if the code blob is null.  This causes the exception handler to lose the location of the real crash (I think).

;; Using jvm: "/java/re/jdk/1.7.0/promoted/ea/b33/binaries/windows-i586/jre/bin/client/jvm.dll"#
# A fatal error has been detected by the Java Runtime Environment:
#
#  Internal Error (sharedRuntime.cpp:549), pid=3684, tid=3104
#  Error: guarantee(cb != 0,"exception happened outside interpreter, nmethods and vtable stubs (1)")
#
# Java VM: Java HotSpot(TM) Client VM (14.0-b01 mixed mode windows-x86 )
# If you would like to submit a bug report, please visit:
#   http://java.sun.com/webapps/bugreport/crash.jsp
#
---------------  T H R E A D  ---------------

Current thread (0x0efc5000):  JavaThread "AWT-EventQueue-0" [_thread_in_Java, id=3104, stack(0x0f2d0000,0x0f320000)]

Stack: [0x0f2d0000,0x0f320000],  sp=0x0f31e1b4,  free space=312k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
V  [jvm.dll+0x1bd5b7];;  ?report_and_die@VMError@@QAEXXZ+0x4d7
V  [jvm.dll+0x955b8];;  ?report_fatal@@YAXPBDH0@Z+0x28
V  [jvm.dll+0x1700a3];;  ?continuation_for_implicit_exception@SharedRuntime@@SAPAEPAVJavaThread@@PAEW4ImplicitExceptionKind@1@@Z+0x183
V  [jvm.dll+0x14d4d1];;  ?topLevelExceptionFilter@@YGJPAU_EXCEPTION_POINTERS@@@Z+0x191
V  [jvm.dll+0x14e5af];;  ?os_exception_wrapper@os@@SAXP6AXPAVJavaValue@@PAVmethodHandle@@PAVJavaCallArguments@@PAVThread@@@Z0123@Z+0x6f
V  [jvm.dll+0xc95cd];;  ?call@JavaCalls@@SAXPAVJavaValue@@VmethodHandle@@PAVJavaCallArguments@@PAVThread@@@Z+0x1d
V  [jvm.dll+0xd243f];;  ?jni_invoke_nonstatic@@YAXPAUJNIEnv_@@PAVJavaValue@@PAV_jobject@@W4JNICallType@@PAU_jmethodID@@PAVJNI_ArgumentPusher@@PAVThread@@@Z+0x1ef
V  [jvm.dll+0xd5237];;  _jni_CallVoidMethodV@16+0xa7
V  [jvm.dll+0xe1839];;  _checked_jni_CallVoidMethodV@16+0x99