re PR c/92249 (ICE in c_parser_gimple_compound_statement w/ GIMPLE testcases)

2019-10-28  Richard Biener  <rguenther@suse.de>

	PR c/92249
	* gimple-parser.c (c_parser_parse_gimple_body): Make
	current_bb the entry block initially to easier recover
	from errors.
	(c_parser_gimple_compound_statement): Adjust.

From-SVN: r277512

gcc/c/ChangeLog

+2019-10-28  Richard Biener  <rguenther@suse.de>
+
+	PR c/92249
+	* gimple-parser.c (c_parser_parse_gimple_body): Make
+	current_bb the entry block initially to easier recover
+	from errors.
+	(c_parser_gimple_compound_statement): Adjust.
+
 2019-10-24  Jakub Jelinek  <jakub@redhat.com>
 
 	* c-parser.c (c_finish_omp_declare_variant): Use

gcc/c/gimple-parser.c

@@ -235,6 +235,7 @@ c_parser_parse_gimple_body (c_parser *cparser, char *gimple_pass,
       /* We have at least cdil_gimple_cfg.  */
       gimple_register_cfg_hooks ();
       init_empty_tree_cfg ();
+      parser.current_bb = ENTRY_BLOCK_PTR_FOR_FN (cfun);
       /* Initialize the bare loop structure - we are going to only
          mark headers and leave the rest to fixup.  */
       set_loops_for_fn (cfun, ggc_cleared_alloc<struct loops> ());
@@ -594,7 +595,7 @@ c_parser_gimple_compound_statement (gimple_parser &parser, gimple_seq *seq)
 	      if (last_basic_block_for_fn (cfun) <= index)
 		last_basic_block_for_fn (cfun) = index + 1;
 	      n_basic_blocks_for_fn (cfun)++;
-	      if (!parser.current_bb)
+	      if (parser.current_bb->index == ENTRY_BLOCK)
 		parser.push_edge (ENTRY_BLOCK, bb->index, EDGE_FALLTHRU,
 				  profile_probability::always ());