On 02/28/2018 11:31 AM, jonas echterhoff via lldb-dev wrote:
I'm using lldb-900.0.64.
^^^^^^^^^^^^^^
??????????????
Latest official release is 5.0.1; also there are 6.0.0 (at -rc3, the next
release)
and 7.0.0 (a.k.a SVN trunk). What's the 'version' output of your LLDB prompt?
Unfortunately, I have not yet succeeded in coming up with a small, independent
repro case which shows this problem.
IIUC this is it:
struct A {
int id0;
A () { id0 = 111; }
virtual int f (int x) { return x + 1; }
int g (int x) { return x + 11; }
};
struct B: A {
int id1;
B () { id1 = 222; }
virtual int f (int x) { return x + 2; }
int g (int x) { return x + 12; }
};
namespace S {
struct AS {
int id0;
AS () { id0 = 333; }
virtual int f (int x) { return x + 3; }
int g (int x) { return x + 13; }
};
struct B: AS {
int id1;
B () { id1 = 444; }
virtual int f (int x) { return x + 4; }
int g (int x) { return x + 14; }
};
}
int main (int argc, char *argv[])
{
B obj1;
S::B obj2;
return
obj1.f (argc) +
obj2.f (argc) +
obj1.g (argc) +
obj2.g (argc);
}
And in gdb, it is:
$ gdb -q t-class2
Reading symbols from t-class2...done.
(gdb) b S::B::f
Breakpoint 1 at 0x400775: file t-class2.cc, line 25.
(gdb) b S::B::g
Breakpoint 2 at 0x400789: file t-class2.cc, line 26.
(gdb) r
Starting program: /home/dantipov/tmp/t-class2
Breakpoint 1, S::B::f (this=0x7fffffffdb50, x=1) at t-class2.cc:25
25 virtual int f (int x) { return x + 4; }
(gdb) bt
#0 S::B::f (this=0x7fffffffdb50, x=1) at t-class2.cc:25
#1 0x0000000000400643 in main (argc=1, argv=0x7fffffffdc68) at t-class2.cc:36
(gdb) p this
$1 = (S::B * const) 0x7fffffffdb50
(gdb) p *this
$2 = {<S::AS> = {_vptr.AS = 0x400840 <vtable for S::B+16>, id0 = 333}, id1 =
444}
(gdb) c
Continuing.
Breakpoint 2, S::B::g (this=0x7fffffffdb50, x=1) at t-class2.cc:26
26 int g (int x) { return x + 14; }
(gdb) bt
#0 S::B::g (this=0x7fffffffdb50, x=1) at t-class2.cc:26
#1 0x0000000000400669 in main (argc=1, argv=0x7fffffffdc68) at t-class2.cc:38
(gdb) p this
$3 = (S::B * const) 0x7fffffffdb50
(gdb) p *this
$4 = {<S::AS> = {_vptr.AS = 0x400840 <vtable for S::B+16>, id0 = 333}, id1 =
444}
E.g. in calls to obj2.f () and obj2.g (), 'this' is 0x7fffffffdb50, and the
object
itself is {333, 444}.
With lldb, it is:
$ /home/dantipov/.local/llvm-6.0.0/bin/lldb t-class2
(lldb) target create "t-class2"
Current executable set to 't-class2' (x86_64).
(lldb) breakpoint set -n S::B::f
Breakpoint 1: where = t-class2`S::B::f(int) at t-class2.cc:25, address =
0x000000000040076a
(lldb) breakpoint set -n S::B::g
Breakpoint 2: where = t-class2`S::B::g(int) + 11 at t-class2.cc:26, address =
0x0000000000400789
(lldb) run
Process 5180 launched: '/home/dantipov/tmp/t-class2' (x86_64)
Process 5180 stopped
* thread #1, name = 't-class2', stop reason = breakpoint 1.1
frame #0: 0x000000000040076a t-class2`S::B::f(this=0x00007fffffffdb50, x=1)
at t-class2.cc:25
22 struct B: AS {
23 int id1;
24 B () { id1 = 444; }
-> 25 virtual int f (int x) { return x + 4; }
26 int g (int x) { return x + 14; }
27 };
28 }
(lldb) bt
* thread #1, name = 't-class2', stop reason = breakpoint 1.1
* frame #0: 0x000000000040076a t-class2`S::B::f(this=0x00007fffffffdb50, x=1)
at t-class2.cc:25
frame #1: 0x0000000000400643 t-class2`main(argc=1, argv=0x00007fffffffdc58)
at t-class2.cc:36
frame #2: 0x00007ffff712000a libc.so.6`__libc_start_main(main=(t-class2`main at t-class2.cc:31), argc=1, argv=0x00007fffffffdc58, init=<unavailable>, fini=<unavailable>, rtld_fini=<unavailable>,
stack_end=0x00007fffffffdc48) at libc-start.c:308
frame #3: 0x000000000040054a t-class2`_start + 42
(lldb) p this
(S::B *) $0 = 0x00007fffffffdb50
(lldb) p *this
(S::B) $1 = {
S::AS = (id0 = 111)
id1 = 222
}
(lldb) c
Process 5180 resuming
Process 5180 stopped
* thread #1, name = 't-class2', stop reason = breakpoint 2.1
frame #0: 0x0000000000400789 t-class2`S::B::g(this=0x00007fffffffdb40, x=1)
at t-class2.cc:26
23 int id1;
24 B () { id1 = 444; }
25 virtual int f (int x) { return x + 4; }
-> 26 int g (int x) { return x + 14; }
27 };
28 }
29
(lldb) bt
* thread #1, name = 't-class2', stop reason = breakpoint 2.1
* frame #0: 0x0000000000400789 t-class2`S::B::g(this=0x00007fffffffdb40, x=1)
at t-class2.cc:26
frame #1: 0x0000000000400669 t-class2`main(argc=1, argv=0x00007fffffffdc58)
at t-class2.cc:38
frame #2: 0x00007ffff712000a libc.so.6`__libc_start_main(main=(t-class2`main at t-class2.cc:31), argc=1, argv=0x00007fffffffdc58, init=<unavailable>, fini=<unavailable>, rtld_fini=<unavailable>,
stack_end=0x00007fffffffdc48) at libc-start.c:308
frame #3: 0x000000000040054a t-class2`_start + 42
(lldb) p this
(S::B *) $2 = 0x00007fffffffdb40
(lldb) p *this
(S::B) $3 = {
S::AS = (id0 = 333)
id1 = 444
}
Here 'this' is different between calls to obj2.f () and obj2.g ()
(0x00007fffffffdb50 vs.
0x00007fffffffdb40), and objects are shown as different as well - {111, 222}
vs. {333, 444}.
Dmitry
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