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

[=?gb2312?B?1Ma07w==?=]

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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