tree d89459f3247e703951b53a720527b890d4b5eebc
parent 3ddce1c578d8c80a792d92c83930bba5fdbb9410
author Elliott Hughes <enh@google.com> 1305227820 -0700
committer Elliott Hughes <enh@google.com> 1305227820 -0700

Improve diagnostics when an invalid reference is given to Get/Set*Field functions.

It may be worth treating NULL as a special case of "invalid" for an even
clearer diagnostic, but this is a huge leap forward from just crashing inside
CheckJNI:

    W( 4443) JNI ERROR: field operation on invalid reference ((nil))  (dalvikvm)
    E( 4443) VM aborting  (dalvikvm)

Change-Id: Ied7090a57becb10ca7c8cb4be56cd7c1f109add5