> -----Original Message-----
> From: Eric Lemings [mailto:[EMAIL PROTECTED]
> Sent: Wednesday, March 26, 2008 10:55 AM
> To: [email protected]
> Subject: RE: [STDCXX-709] ContainerData ctor and
> UserClass::from_char()
>
>
>
...
>
> I think you're right. I set a breakpoint in operator_new()
> without trying to step into it and gdb hit it but it won't
> step into it. I think I know why. gdb can't step into the
> __cxa_vec_new2() function:
>
> #1 0x40ab2e0:0 in operator new[] (n=100)
> at /amd/devco/lemings/work/stdcxx/trunk/tests/include/rw_new.h:184
> #2 0x200000007ebbcd30:0 in __cxa_vec_new2+0x70 ()
> from /usr/lib/hpux32/libCsup.so.1
> #3 0x413cf60:0 in UserClass* __rw_from_char<UserClass>
> (No.Identifier_0=0x0,
> str=0x7fffe650 "ab", len=2, sorted=false)
> at /amd/devco/lemings/work/stdcxx/trunk/tests/src/value.cpp:486
>
> Sometimes the __cxa_vec_new2() function is not linked in and gdb
> can therefore step right into operator new[].
>
> I wonder if the presence/absence of this function and library has
> anything to do with our problem?
It looks like the pointer returned by operator_new is not the same
pointer being assigned to the array pointer in value.cpp at line
485. Here's what I observed:
(gdb) print *last
$15 = {
prev_ = 0x4002b9c0,
next_ = 0x0,
ptr_ = 0x400d3fd8,
size_ = 100,
id_ = 4294936458,
self_ = 0x400d3fc0
}
(gdb) print last->prev_
$16 = (struct Header *) 0x4002b9c0
(gdb) print *(last->prev_)
$17 = {
prev_ = 0x0,
next_ = 0x400d3fc0,
ptr_ = 0x4002b9d8,
size_ = 16,
id_ = 0,
self_ = 0x4002b9c0
}
(gdb) next
0x200000007ebbcd30:0 in __cxa_vec_new2+0x70 ()
from /usr/lib/hpux32/libCsup.so.1
(gdb) next
Single stepping until exit from function __cxa_vec_new2,
which has no line number information.
0x200000007ebbcd90:0 in __cxa_vec_new2+0xd0 ()
from /usr/lib/hpux32/libCsup.so.1
(gdb) up
#1 0x413cf60:0 in UserClass* __rw_from_char<UserClass>
(No.Identifier_0=0x0,
str=0x7fffe650 "ab", len=2, sorted=false)
at /amd/devco/lemings/work/stdcxx/trunk/tests/src/value.cpp:486
486 array = new T [strlen_];
(gdb) list
481 }
482
483 T*array = 0;
484
485 _TRY {
486 array = new T [strlen_];
487 }
488 _CATCH (...) {
489
490 if (str_buf_ != str_)
(gdb) next
Single stepping until exit from function __cxa_vec_new2,
which has no line number information.
UserClass* __rw_from_char<UserClass> (No.Identifier_0=0x0,
str=0x7fffe650 "ab", len=2, sorted=false)
at /amd/devco/lemings/work/stdcxx/trunk/tests/src/value.cpp:498
498 for (size_t i = 0; i < strlen_; ++i)
(gdb) print array
$18 = (struct UserClass *) 0x400d3fdc
Compare the array pointer at the very bottom to the value of last->ptr_
near the top. Its off by 4 bytes.
Brad.
