[Bug gdb/30236] New: gdb crashes inspecting value of enum with more than 2^15 enumerators

["blue.swallow.71 at gmail dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=30236

            Bug ID: 30236
           Summary: gdb crashes inspecting value of enum with more than
                    2^15 enumerators
           Product: gdb
           Version: 12.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: gdb
          Assignee: unassigned at sourceware dot org
          Reporter: blue.swallow.71 at gmail dot com
  Target Milestone: ---

Tested with gdb 12.1 and compiled with g++ 11.3.0

Description:

When debugging a program and trying to inspect (print) a value of an enum, gdb
will crash if said enum has more than 2^15 (32768) elements.

Steps to reproduce:
1) create foo.h and define an enum with more than 32768 elements.
===foo.h===
enum Foo {
    value1,
    value2,
    // more values
    value32769
};
===foo.h===

2) create main.cpp and use any value from Foo enum
===main.cpp
#include "foo.h"
int main() {
    Foo foo_var = value4;
    return 0;
}
===main.cpp===

3) compile main.cpp (e.g. g++ -g -O0 -o test main.cpp)
4) run gdb (e.g. gdb test)
5) setup a breakpoint at return 0; and run
6) inspect the value of foo_var or any of the elements of Foo (e.g. "print
foo_var" or "print (int)value12"
7) gdb will crash with the following message:

/build/gdb-ZgDh0V/gdb-12.1/gdb/gdbtypes.h:1064: internal-error: field:
Assertion `idx >= 0 && idx < num_fields ()' failed.
A problem internal to GDB has been detected,
further debugging may prove unreliable.
----- Backtrace -----
0x560dd53b8077 ???
0x560dd571ca64 ???
0x560dd571cca0 ???
0x560dd586c0e4 ???
0x560dd572be35 ???
0x560dd572b563 ???
0x560dd53de2ed ???
0x560dd572b6e5 ???
0x560dd55d7aa4 ???
0x560dd55d7d32 ???
0x560dd53ed654 ???
0x560dd56e3394 ???
0x560dd54bb9a4 ???
0x560dd54bbd43 ???
0x560dd54bc4c6 ???
0x7fbf92f05e0d ???
0x560dd54baa95 ???
0x560dd54bc374 ???
0x560dd54ba68b ???
0x560dd586c815 ???
0x560dd586ccaa ???
0x560dd557836c ???
0x560dd557a054 ???
0x560dd531015f ???
0x7fbf91e80d8f __libc_start_call_main
        ../sysdeps/nptl/libc_start_call_main.h:58
0x7fbf91e80e3f __libc_start_main_impl
        ../csu/libc-start.c:392
0x560dd5315bf4 ???
0xffffffffffffffff ???
---------------------
/build/gdb-ZgDh0V/gdb-12.1/gdb/gdbtypes.h:1064: internal-error: field:
Assertion `idx >= 0 && idx < num_fields ()' failed.
A problem internal to GDB has been detected,
further debugging may prove unreliable.
Quit this debugging session? (y or n) y

This is a bug, please report it.  For instructions, see:
<https://www.gnu.org/software/gdb/bugs/>.

/build/gdb-ZgDh0V/gdb-12.1/gdb/gdbtypes.h:1064: internal-error: field:
Assertion `idx >= 0 && idx < num_fields ()' failed.
A problem internal to GDB has been detected,
further debugging may prove unreliable.
Create a core file of GDB? (y or n) y
Aborted (core dumped)

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