HotSpot segfaults if given -XX options with an empty string argument (regression)

[Volker Simonis]

Hi,

I just realized that there's a regression in the argument parsing code
of the HotSpot which leads to a segmentation fault if an -XX option
with an empty string argument (e.g. -XX:SyncKnobs= or
-XX:SyncKnobs="") is given on the command line.

The regression must have appeared somewhere in HS 11, because Java
1.6.0_06 (which contains HS 10.0_b22) doesn't show the problem while
both Java 1.6.0_10 (HS 11.0_b11) and Java 1.7.0-ea-b24 (HS 12.0_b01)
as well as the latest OpenJDK snapshot (Rev. 292 with tag jdk7-b34)
are affected.

Attached you can find a patch against
http://hg.openjdk.java.net/jdk7/jdk7/hotspot

At the same time, the patch also fixes a minor flaw in globals.hpp
where the default value of the 'PrintAssemblyOptions' option, which is
of type 'ccstr', should really be "" instead of 'false'.

Regards,
Volker
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