Re: [rfc 2/2] Follow DW_AT_linkage_name for methods [Re: The future of dwarf2_physname]

[Keith Seitz <keiths at redhat dot com>]

On 05/25/2011 01:40 PM, Tom Tromey wrote:
> > > > > > "Jan" == Jan Kratochvil<jan.kratochvil@redhat.com>  writes:
>
> Jan>  Also after a chat with Tom Tromey I no longer use DMGL_RET_POSTFIX.
> Jan>  That is for ELF symbol `long m<char>()' GDB with proposed patch
> Jan>  uses `m<char>()' (and not `m<char>()long').  This is compatible
> Jan>  with gdb-7.2 (physname) template functions.
>
> This patch looks pretty good to me.
>
> Keith, are there parts of your series which are still needed for 7.3 if
> this patch is committed there?

If we want to fix 12266, yes, we're still going to need much of the 
patchset: cp_canonicalize_no_typedefs, printname, and the 
cp_demangled_name_parse_free patches. Those patches fix 12266 and a 
bunch of related problems (which are not regressions):

*** Using pre-physname:

(gdb) b calltest(foo)
Function "calltest(foo)" not defined.
Make breakpoint pending on future shared library load? (y or [n]) n
(gdb) b calltest(std::string)
Breakpoint 1 at 0x40075c: file 12266.cc, line 5.
(gdb) b calltest(std::basic_string<char, std::char_traits<char>, 
std::allocator<char> >)
Function "calltest(std::basic_string<char, std::char_traits<char>, 
std::allocator<char> >)" not defined.
Make breakpoint pending on future shared library load? (y or [n]) n


*** Using DW_AT_linkage_name (Jan's patches):

(gdb) b calltest(foo)
Function "calltest(foo)" not defined.
Make breakpoint pending on future shared library load? (y or [n]) n
(gdb) b calltest(std::string)
Function "calltest(std::string)" not defined.
Make breakpoint pending on future shared library load? (y or [n]) n
(gdb) b calltest(std::basic_string<char, std::char_traits<char>, 
std::allocator<char> >)
Breakpoint 1 at 0x40075c: file 12266.cc, line 5.

*** Using 12266 patches (on top of Jan's DW_AT_linkage_name patches):

(gdb) b calltest(foo)
Breakpoint 1 at 0x40075c: file 12266.cc, line 5.
(gdb) b calltest(std::string)
Note: breakpoint 1 also set at pc 0x40075c.
Breakpoint 2 at 0x40075c: file 12266.cc, line 5.
(gdb) b calltest(std::basic_string<char, std::char_traits<char>, 
std::allocator<char> >)
Note: breakpoints 1 and 2 also set at pc 0x40075c.
Breakpoint 3 at 0x40075c: file 12266.cc, line 5.

Mind you, I don't know if I would recommend taking in such a big patch 
this late in the game... Nonetheless, I hope to have this resubmitted today.

Keith