[Bug debug/66069] New: New -fkeep-all-method-instances

[Bug debug/66069] New: New -fkeep-all-method-instances

[jan.kratochvil at redhat dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66069

            Bug ID: 66069
           Summary: New -fkeep-all-method-instances
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: P3
         Component: debug
          Assignee: unassigned at gcc dot gnu.org
          Reporter: jan.kratochvil at redhat dot com
  Target Milestone: ---
            Target: x86_64-linux-gnu

For debugging (-O0 -g) code there could be a way to provide all instantiable
methods for TYPE when anything from template<TYPE> gets used.  The problem:

-------------------------------------------------------------------------------
1       #include <memory>
2       class C { public: int i; };
3       int main() {
4         std::unique_ptr<C> cp(new C());
5         return cp->i;
6       }
(gdb) p cp
$1 = std::unique_ptr<C> containing 0x603010
(gdb) p *cp
Could not find operator*.
-------------------------------------------------------------------------------
compiled-in:
std::unique_ptr<C, std::default_delete<C> >::get() const
std::unique_ptr<C, std::default_delete<C> >::get_deleter()
std::unique_ptr<C, std::default_delete<C> >::operator->() const
std::unique_ptr<C, std::default_delete<C> >::unique_ptr(C*)
std::unique_ptr<C, std::default_delete<C> >::~unique_ptr()
-------------------------------------------------------------------------------

The current workaround:
-------------------------------------------------------------------------------
1       #include <memory>
2       class C { public: int i; };
3       int main() {
4         std::unique_ptr<C> cp(new C());
5         __attribute__((unused)) const C &gdbstub(*cp);
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
6         return cp->i;
7       }
(gdb) p *cp
$1 = (C &) @0x603010: {i = 0}
-------------------------------------------------------------------------------
added method:
std::unique_ptr<C, std::default_delete<C> >::operator*() const
-------------------------------------------------------------------------------

Similar problems are with operator[], operator-> for maps etc.

[Bug debug/66069] New -fkeep-all-method-instances

[jan.kratochvil at redhat dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66069

Jan Kratochvil <jan.kratochvil at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
            Version|6.0                         |5.1.1
         Resolution|---                         |INVALID

--- Comment #1 from Jan Kratochvil <jan.kratochvil at redhat dot com> ---
PASS: gcc-5.1.1-1.fc22.x86_64
FAIL: gcc-4.9.2-6.fc21.x86_64

It is in fact already fixed thanks to Python xmethods.

The option would still make some sense for custom non-libstdc++ templates if
one does not write xmethods for them but that has probably only marginal
usefulness.

[Bug debug/66069] New -fkeep-all-method-instances

[manu at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66069

Manuel López-Ibáñez <manu at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |manu at gcc dot gnu.org

--- Comment #2 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
(In reply to Jan Kratochvil from comment #1)
> The option would still make some sense for custom non-libstdc++ templates if
> one does not write xmethods for them but that has probably only marginal
> usefulness.

'compile print' in C++ will fix that, no?
>From gcc-bugs-return-485847-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri May 08 13:05:10 2015
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From: "rstrankle1 at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/66072] New: Trying to compile a makefile in c++, error in Description
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idf072

            Bug ID: 66072
           Summary: Trying to compile a makefile in c++, error in
                    Description
           Product: gcc
           Version: 4.8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: rstrankle1 at gmail dot com
  Target Milestone: ---

#0  0x00007ffff75079bc in free () from /lib/x86_64-linux-gnu/libc.so.6
#1  0x0000000000401359 in addPolicy(int, int (*) [5], int&) ()
#2  0x00000000004017c0 in fillUpPolicyRiskTable(int (*) [5], int&) ()
#3  0x0000000000401b29 in main ()

[Bug debug/66069] New -fkeep-all-method-instances

[jan.kratochvil at redhat dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66069

Jan Kratochvil <jan.kratochvil at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |pmuldoon at redhat dot com

--- Comment #3 from Jan Kratochvil <jan.kratochvil at redhat dot com> ---
I think so but that would require the source files available.

So far 'compile print' (for C) generates all the context only from DWARF - this
case was this PR's goal.

The source files may not match well for *-debuginfo.rpm packaged binaries but
IMO there is no chance for more complex debugging due to the -O2 -g debug info
limitations.