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Patch: Java -vs- null strings
- To: gdb-patches at sourceware dot cygnus dot com
- Subject: Patch: Java -vs- null strings
- From: Tom Tromey <tromey at cygnus dot com>
- Date: 08 Aug 2000 14:20:03 -0600
- Reply-To: tromey at cygnus dot com
If you are debugging a Java program and try to print a String variable
whose value is null you will see this:
(gdb) p name
$3 = Cannot access memory at address 0x8
This is lame. The appended patch fixes gdb to do this:
(gdb) p p
$1 = null
Is this ok?
2000-08-08 Tom Tromey <tromey@cygnus.com>
* jv-valprint.c (java_value_print): Only print non-null Strings.
Tom
Index: jv-valprint.c
===================================================================
RCS file: /cvs/src/src/gdb/jv-valprint.c,v
retrieving revision 1.3
diff -u -r1.3 jv-valprint.c
--- jv-valprint.c 2000/07/30 01:48:26 1.3
+++ jv-valprint.c 2000/08/08 20:11:49
@@ -197,9 +197,10 @@
if (TYPE_CODE (type) == TYPE_CODE_PTR
&& TYPE_TARGET_TYPE (type)
&& TYPE_NAME (TYPE_TARGET_TYPE (type))
- && strcmp (TYPE_NAME (TYPE_TARGET_TYPE (type)), "java.lang.String") == 0
+ && strcmp (TYPE_NAME (TYPE_TARGET_TYPE (type)), "java.lang.String") == 0
&& (format == 0 || format == 's')
- && address != 0)
+ && address != 0
+ && value_as_pointer (val) != 0)
{
value_ptr data_val;
CORE_ADDR data;