[Bug rust/27194] put rust demangler on 10.x branch

["mehmetgelisin at aol dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=27194

Mehmet gelisin <mehmetgelisin at aol dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |mehmetgelisin at aol dot com

--- Comment #14 from Mehmet gelisin <mehmetgelisin at aol dot com> ---
he issue lies with the fact that we have a DIE in a CU A referring to a DIE in
a CU B (using DW_AT_abstract_origin). http://www-look-4.com/  The DIEs for CU B
are not loaded yet (or rather, have been unloaded due to DWARF CU aging stuff),
and we try to load them using:

      /* If necessary, add it to the queue and load its DIEs.  */
http://www.compilatori.com/
      if (maybe_queue_comp_unit (cu, per_cu, per_objfile, cu->language))
        load_full_comp_unit (per_cu, per_objfile, per_objfile->get_cu (per_cu),
                             false, cu->language);
http://www.wearelondonmade.com/

Since the CU is already queued for expansion, maybe_queue_comp_unit returns
false and we don't call load_full_comp_unit. http://www.jopspeech.com/ I think
maybe_queue_comp_unit is the wrong thing to call here, because "queuing for
symtab expansion" is http://joerg.li/ unrelated to "loading the DIEs in
memory".  We should rather check: "are the DIEs for per_cu loaded
http://connstr.net/  into memory yet?  if not do it now", which is what the
patch below implements.

http://embermanchester.uk/ 
@@ -22937,12 +22939,15 @@ follow_die_offset (sect_offset sect_off, int
offset_in_dwz,
 http://www.slipstone.co.uk/       per_cu = dwarf2_find_containing_comp_unit
(sect_off, offset_in_dwz,
                                                 per_objfile);

-  http://www.logoarts.co.uk/     /* If necessary, add it to the queue and load
its DIEs.  */
-      if (maybe_queue_comp_unit (cu, per_cu, per_objfile, cu->language))
-       load_full_comp_unit (per_cu, per_objfile, per_objfile->get_cu (per_cu),
-                            false, cu->language);
http://www.acpirateradio.co.uk/ 
-
       target_cu = per_objfile->get_cu (per_cu);
+      if (target_cu == nullptr)
+       {
+         load_full_comp_unit (per_cu, per_objfile, per_objfile->get_cu
https://waytowhatsnext.com/  (per_cu),
+                              false, cu->language);
+         target_cu = per_objfile->get_cu (per_cu);
+       }
+
+      gdb_assert (target_cu != nullptr);
     } __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50
#1  0x00007fc878bb0859 in __GI_abort () at abort.c:79
https://www.webb-dev.co.uk/ 
#2  0x000056229e1f0e76 in dump_core () at
../../../../binutils-gdb/gdb/utils.c:204
#3  0x000056229e1f1799 in internal_vproblem(internal_problem *, const char *,
int, const char *, typedef __va_list_tag __va_list_tag *)
(problem=0x56229f7c09e0 <internal_error_problem>, 
http://www.iu-bloomington.com/ 
    file=0x56229e7cb208 "../../../../binutils-gdb/gdb/dwarf2/read.c",
line=9251, 
    fmt=0x56229e7ca848 "%s: Assertion `%s' failed.", ap=0x7ffc18d82410)
    at ../../../../binutils-gdb/gdb/utils.c:414
#4  0x000056229e1f1890 in internal_verror (
    file=0x56229e7cb208 "../../../../binutils-gdb/gdb/dwarf2/read.c",
line=9251, 
    fmt=0x56229e7ca848 "%s: Assertion `%s' failed.", ap=0x7ffc18d82410)
    at ../../../../binutils-gdb/gdb/utils.c:439
#5  0x000056229e685fda in internal_error (
    file=0x56229e7cb208 "../../../../binutils-gdb/gdb/dwarf2/read.c",
line=9251, 
    fmt=0x56229e7ca848 "%s: Assertion `%s' failed.") at
../../../../binutils-gdb/gdbsupport/errors.cc:55
#6  0x000056229d7c1103 in load_full_comp_unit (this_cu=0x5622a1d2f220,
per_objfile=0x5622a1351a10, 
    existing_cu=0x5622b648d2f0, skip_partial=false,
pretend_language=language_minimal) https://komiya-dental.com/
    at ../../../../binutils-gdb/gdb/dwarf2/read.c:9251
#7  0x000056229d783f35 in load_cu (per_cu=0x5622a1d2f220,
per_objfile=0x5622a1351a10, 
    skip_partial=false) at ../../../../binutils-gdb/gdb/dwarf2/read.c:2389
#8  0x000056229d7840ad in dw2_do_instantiate_symtab (per_cu=0x5622a1d2f220,
per_objfile=0x5622a1351a10, 
    skip_partial=false) at ../../../../binutils-gdb/gdb/dwarf2/read.c:2420
#9  0x000056229d7c0926 in dwarf2_psymtab::expand_psymtab (this=0x5622a293efa0,
objfile=0x5622a1d5f4b0)
    at ../../../../binutils-gdb/gdb/dwarf2/read.c:9183
#10 0x000056229d7bf853 in dwarf2_psymtab::read_symtab (this=0x5622a293efa0,
objfile=0x5622a1d5f4b0)

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