[Bug python/10633] New: std::string pretty printer should respect 'print elements' limit

["ppluzhnikov at google dot com" <sourceware-bugzilla at sourceware dot org>]

There is inconsistency between e.g. std::vector and std::string pretty
printers: the former respects 'print elements' limit, the latter doesn't.

Example:

--- cut ---
#include <string>
#include <vector>

using namespace std;
int main()
{
  //                      01234567890123456789012
  const char *const cs = "Mary had a little lamb.";
  vector<int> v;
  string s;

  for (int i = 0; i < 10; ++i)
    {
      v.push_back(i);
      s += cs;
    }
  return 0;  // break here
}
--- cut ---

g++ -g -o long-str long-str.cc

gdb64-cvs -nx long-str
GNU gdb (GDB) 6.8.50.20090911-cvs
Copyright (C) 2009 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-unknown-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /home/ppluzhnikov/src/tmp/long-str...done.
(gdb) b 17
Breakpoint 1 at 0x4008d6: file long-str.cc, line 17.
(gdb) run
Starting program: /home/ppluzhnikov/src/tmp/long-str 

Breakpoint 1, main () at long-str.cc:17
17        return 0;  // break here

## This is fresh svn sync of the latest pretty printers as of 5 minutes ago:
(gdb) py sys.path.insert(0, '/home/ppluzhnikov/Archive/gcc-svn/libstdc++-v3/python')
(gdb) py from libstdcxx.v6.printers import register_libstdcxx_printers
(gdb) py register_libstdcxx_printers (None)
(gdb) set print elem 5
(gdb) print v
$1 = std::vector of length 10, capacity 16 = {0, 1, 2, 3, 4...}
(gdb) print cs
$2 = 0x40138e "Mary "...
(gdb) print s
$3 = 
    "Mary had a little lamb.Mary had a little lamb.Mary had a little lamb.Mary
had a little lamb.Mary had a little lamb.Mary had a little lamb.Mary had a
little lamb.Mary had a little lamb.Mary had a little lamb.Mary had a little lamb."
(gdb) q

Note how 'print elem 5' applies to both vector and 'const char *cs',
but the string is printed "in full".

-- 
           Summary: std::string pretty printer should respect 'print
                    elements' limit
           Product: gdb
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: python
        AssignedTo: unassigned at sourceware dot org
        ReportedBy: ppluzhnikov at google dot com
                CC: gdb-prs at sourceware dot org
 GCC build triplet: x86_64-unknown-linux-gnu
  GCC host triplet: x86_64-unknown-linux-gnu
GCC target triplet: x86_64-unknown-linux-gnu


http://sourceware.org/bugzilla/show_bug.cgi?id=10633

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