[PATCH] A small fix on "scanoops" command in CLHSDB

[云达(Yunda)]

cc'ing hotspot-runtime for an official Review, too.

Regards,
Yunda

From: Staffan Larsen [mailto:staffan.larsen at oracle.com]
Sent: Tuesday, March 05, 2013 9:21 PM
To: 云达(Yunda)
Cc: Krystal Mo; serviceability-dev at openjdk.java.net
Subject: Re: [PATCH] A small fix on "scanoops" command in CLHSDB

I have created issue JDK-8009457 to track this. Still waiting for a review, though.

Thanks,
/Staffan

On 22 feb 2013, at 04:32, 云达 <yunda.mly at taobao.com<mailto:yunda.mly at taobao.com>> wrote:


Staffan & Kris,

Thank both of you for reviewing this. Hope you two could be official Reviewer soon ☺

Regards,
Yunda

发件人: Staffan Larsen [mailto:staffan.larsen at oracle.com<http://oracle.com>]
发送时间: 2013年2月21日 18:21
收件人: Krystal Mo
抄送: 云达; serviceability-dev at openjdk.java.net<mailto:serviceability-dev at openjdk.java.net>
主题: Re: [PATCH] A small fix on "scanoops" command in CLHSDB

I think this looks good, too. I'm not an official Reviewer, either.

Thanks,
/Staffan

On 21 feb 2013, at 04:32, Krystal Mo <krystal.mo at oracle.com<mailto:krystal.mo at oracle.com>> wrote:

Hi Yunda,

This patch looks reasonable to me. But you'll need an official Reviewer to review this.

- Kris
On 2013/2/19 1:24, 云达 wrote:
Hi all,

When I use “scanoops” command in CLHSDB, I find that if the type doesn’t exist, the output will be all the oops in the scope [start, end]. (see below) I think that’s irrational because all the oops between 0x00000000ee2000a0 and 0x00000000ee200550 are of type “java/lang/Class” and there’s no type “java/lang/Class2” or “com/taobao/Test” at all!

hsdb> scanoops 0x00000000ee2000a0 0x00000000ee200550
0x00000000ee2000a0 java/lang/Class
0x00000000ee200118 java/lang/Class
0x00000000ee200190 java/lang/Class
0x00000000ee200208 java/lang/Class
0x00000000ee200280 java/lang/Class
0x00000000ee2002f8 java/lang/Class
0x00000000ee200370 java/lang/Class
0x00000000ee2003e8 java/lang/Class
0x00000000ee200460 java/lang/Class
0x00000000ee2004d8 java/lang/Class
hsdb> scanoops 0x00000000ee2000a0 0x00000000ee200550 java/lang/Class2
0x00000000ee2000a0 java/lang/Class
0x00000000ee200118 java/lang/Class
0x00000000ee200190 java/lang/Class
0x00000000ee200208 java/lang/Class
0x00000000ee200280 java/lang/Class
0x00000000ee2002f8 java/lang/Class
0x00000000ee200370 java/lang/Class
0x00000000ee2003e8 java/lang/Class
0x00000000ee200460 java/lang/Class
0x00000000ee2004d8 java/lang/Class
hsdb> scanoops 0x00000000ee2000a0 0x00000000ee200550 com/taobao/Test
0x00000000ee2000a0 java/lang/Class
0x00000000ee200118 java/lang/Class
0x00000000ee200190 java/lang/Class
0x00000000ee200208 java/lang/Class
0x00000000ee200280 java/lang/Class
0x00000000ee2002f8 java/lang/Class
0x00000000ee200370 java/lang/Class
0x00000000ee2003e8 java/lang/Class
0x00000000ee200460 java/lang/Class
0x00000000ee2004d8 java/lang/Class

I know the reason is that the usage of scanoops is “scanoops start end [ type ]” and “type” is optional. When you don’t input the “type”, the output will be all the oops in the scope [start, end]. But I think the two situations are different and CLHSDB should give right prompt. So I made a small fix:

diff -r b5e3ec9c69fa agent/src/share/classes/sun/jvm/hotspot/CommandProcessor.java
--- a/agent/src/share/classes/sun/jvm/hotspot/CommandProcessor.java   Mon Feb 18 12:49:53 2013 +0100
+++ b/agent/src/share/classes/sun/jvm/hotspot/CommandProcessor.java Tue Feb 19 16:43:45 2013 +0800
@@ -1132,6 +1132,10 @@
                     Klass klass = null;
                     if (t.countTokens() == 1) {
                         klass = SystemDictionaryHelper.findInstanceKlass(t.nextToken());
+                        if(klass == null) {
+                            out.println("No such type.");
+                            return;
+                        }
                     }
                     while (base != null && base.lessThan(end)) {
                         long step = stride;

And the effect will be:
hsdb> scanoops 0x0000000758600000 0x000000075860ffff com/taobao/Test
No such type.

Regards,
Yunda


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