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Re. How to setup a breakpoint on constructor
- From: Michael Stout <stout at evolution dot com>
- To: gdb at sources dot redhat dot com
- Date: Wed, 09 Mar 2005 14:34:51 -0800
- Subject: Re. How to setup a breakpoint on constructor
I've hacked my gdb sources to get breakpoints to work on constructors.
Well it seems to work.
see
http://sources.redhat.com/ml/gdb/2004-07/msg00162.html
and
http://sources.redhat.com/ml/gdb/2004-07/msg00163.html
which explains the issue with multiple copies of the constructor
Here is my analysis from someone who is completely unfamiliar with gdb:
There are two essential problems
1) gdb assumes there is a one-to-one mapping between a
file-linenumber-symbol-table and file:linenumber entered by
the user.
a) find_line_common in symtab.c currently only returns one index into
the linnumber-symbol-table where it should
be able to return multiple line numbers.
b) the same is true for find_line_symtab
c) decode_all_digits in linespec.c calls fine_line_symtab needs to
handle the multiple values returned by find_line_symtab
2) gdb assumes a one-to-one mapping between a breakpoint number and a
breakpoint address. I hacked my fix by
using the breakpoint::releated_breakpoint but I don't think this is not
a good fix.
To fix this requires a load of changes. I'm willing to start submitting
patches to get this to work, but I need to have someone
look over my shoulder. The first step would be to modify modify
find_line_common to return multiple indexes.
Here is a simple sample program that illustrates the problem
class gobo
{
public:
gobo();
int i;
};
gobo ::gobo()
{
i = 4;
}
int main(int argc,int **argv)
{
gobo flagger;
}
g++ -g -o foo foo.cpp (g++ 3.3.5 debian)
gdb foo
break foo.cpp:10
run