Weird gdb problem

Weird gdb problem

[Andrew Haley]

I seem to have broken the debuginfo from gcj. 

When I step into a Java method I don't get info about args passed to
methods.  But this is only for debuginfo compiled into libgcj -- when
I compile a test case myself I get correct args displayed.  As in this
one, where I step into p.p(), the argument "this" is displayed:


(gdb) s
p.p() (this=@2aaaad588e30) at Hello.java:7
(gdb) 
0x00002aaaac057820 in java.lang.Object.Object() ()
    at /mnt/zebedee/aph/gcc/gcj-eclipse/libjava/java/lang/Object.java:360


Note that the first step gave the value of the "this" argument, and
the second one (in libgcj) didn't.  Continuing:


(gdb) 
java.io.PrintStream.println(java.lang.String)void ()
    at /mnt/zebedee/aph/gcc/gcj-eclipse/libjava/java/io/PrintStream.java:482
(gdb) info args
No arguments.


So, to recap: I get values of args to methods displayed in gdb, but
only when I compile test cases.  When stepping into libgcj itself, the
values of args aren't displayed.

So ... might anyone in gdb land like to guess how this might have broken?

TVM,
Andrew.

Re: Weird gdb problem

[Andrew Haley]

Andrew Haley writes:
 > I seem to have broken the debuginfo from gcj. 
 > 
 > When I step into a Java method I don't get info about args passed to
 > methods.  But this is only for debuginfo compiled into libgcj -- when
 > I compile a test case myself I get correct args displayed.  As in this
 > one, where I step into p.p(), the argument "this" is displayed:
 > 
 > 
 > (gdb) s
 > p.p() (this=@2aaaad588e30) at Hello.java:7
 > (gdb) 
 > 0x00002aaaac057820 in java.lang.Object.Object() ()
 >     at /mnt/zebedee/aph/gcc/gcj-eclipse/libjava/java/lang/Object.java:360
 > 
 > 
 > Note that the first step gave the value of the "this" argument, and
 > the second one (in libgcj) didn't.  Continuing:
 > 
 > 
 > (gdb) 
 > java.io.PrintStream.println(java.lang.String)void ()
 >     at /mnt/zebedee/aph/gcc/gcj-eclipse/libjava/java/io/PrintStream.java:482
 > (gdb) info args
 > No arguments.
 > 
 > 
 > So, to recap: I get values of args to methods displayed in gdb, but
 > only when I compile test cases.  When stepping into libgcj itself, the
 > values of args aren't displayed.
 > 
 > So ... might anyone in gdb land like to guess how this might have broken?

We might have found the bug.  Sorry for the noise...

Andrew.