[gcc r13-6564] middle-end: On emergency dumps finish the graph generation.

[Tamar Christina <tnfchris@gcc.gnu.org>]

https://gcc.gnu.org/g:ec4bc86b4399e50a0c848472126dad776772ee1c

commit r13-6564-gec4bc86b4399e50a0c848472126dad776772ee1c
Author: Tamar Christina <tamar.christina@arm.com>
Date:   Thu Mar 9 19:43:08 2023 +0000

    middle-end: On emergency dumps finish the graph generation.
    
    When doing an emergency dump the cfg output dumps are corrupted because the
    ending "}" is missing.
    
    Normally when the pass manager finishes it would call finish_graph_dump_file to
    produce this.  This is called here because each pass can dump multiple digraphs.
    
    However during an emergency dump we only dump the current function and so after
    that is done we never go back to the pass manager.
    
    As such, we need to manually call finish_graph_dump_file in order to properly
    finish off graph generation.
    
    With this -ftree-dump-*-graph works properly during a crash dump.
    
    gcc/ChangeLog:
    
            * passes.cc (emergency_dump_function): Finish graph generation.

Diff:
---
 gcc/passes.cc | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/gcc/passes.cc b/gcc/passes.cc
index 91d560720c3..2f0e378b8b2 100644
--- a/gcc/passes.cc
+++ b/gcc/passes.cc
@@ -1845,6 +1845,13 @@ emergency_dump_function ()
   fprintf (dump_file, "\n\n\nEMERGENCY DUMP:\n\n");
   execute_function_dump (cfun, current_pass);
 
+  /* Normally the passmanager will close the graphs as a pass could be wanting
+     to print multiple digraphs. But during an emergency dump there can only be
+     one and we must finish the graph manually.  */
+  if ((cfun->curr_properties & PROP_cfg)
+      && (dump_flags & TDF_GRAPH))
+    finish_graph_dump_file (dump_file_name);
+
   if (symtab && current_pass->type == IPA_PASS)
     symtab->dump (dump_file);
 }