[binutils-gdb] gdb: add nullptr check to cooked_index_functions::dump

[Simon Marchi <simark@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=cd07187f238b4d0135f2e331810cc5995a8be8f3

commit cd07187f238b4d0135f2e331810cc5995a8be8f3
Author: Simon Marchi <simon.marchi@efficios.com>
Date:   Tue Jan 31 10:57:21 2023 -0500

    gdb: add nullptr check to cooked_index_functions::dump
    
    Since commit 7d82b08e9e0a ("gdb/dwarf: dump cooked index contents in
    cooked_index_functions::dump"), we see:
    
        maint print objfiles /home/smarchi/build/binutils-gdb/gdb/testsuite/outputs/gdb.dwarf2/dw2-error/dw2-error^M
        ^M
        Object file /home/smarchi/build/binutils-gdb/gdb/testsuite/outputs/gdb.dwarf2/dw2-error/dw2-error:  Objfile at 0x614000005040, bfd at 0x6120000e08c0, 15 minsyms^M
        ^M
        Cooked index in use:^M
        ^M
        /home/smarchi/src/binutils-gdb/gdb/../gdbsupport/gdb-checked-static-cast.h:58: internal-error: checked_static_cast: Assertion `result != nullptr' failed.^M
        A problem internal to GDB has been detected,^M
        further debugging may prove unreliable.^M
        ----- Backtrace -----^M
        FAIL: gdb.dwarf2/dw2-error.exp: maint print objfiles /home/smarchi/build/binutils-gdb/gdb/testsuite/outputs/gdb.dwarf2/dw2-error/dw2-error (GDB internal error)
    
    The problem is that when cooked_index_functions fails to build an index,
    per_objfile->index_table is nullptr.  Therefore, add a nullptr check,
    like other methods of cooked_index_functions already do.
    
    Print the "Cooked index in use" message after the nullptr check, such
    that if the cooked index failed to build, that message is not printed.
    
    Change-Id: Id67aef592e76c41b1e3bde9838a4e36cef873253

Diff:
---
 gdb/dwarf2/read.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/gdb/dwarf2/read.c b/gdb/dwarf2/read.c
index e8a3e359ada..6cee22a3faa 100644
--- a/gdb/dwarf2/read.c
+++ b/gdb/dwarf2/read.c
@@ -18589,14 +18589,15 @@ struct cooked_index_functions : public dwarf2_base_index_functions
 
   void dump (struct objfile *objfile) override
   {
-    gdb_printf ("Cooked index in use:\n");
-    gdb_printf ("\n");
-
     dwarf2_per_objfile *per_objfile = get_dwarf2_per_objfile (objfile);
     cooked_index_vector *index
       = (gdb::checked_static_cast<cooked_index_vector *>
-         (per_objfile->per_bfd->index_table.get ()));
+	  (per_objfile->per_bfd->index_table.get ()));
+    if (index == nullptr)
+      return;
 
+    gdb_printf ("Cooked index in use:\n");
+    gdb_printf ("\n");
     index->dump (objfile->arch ());
   }