[committed][gdb/testsuite] Fix section matching in find_pc_sect_compunit_symtab

[Tom de Vries]

Hi,

When running test-case gdb.base/list-ambiguous.exp with target board readnow,
we run into:
...
FAIL: gdb.base/list-ambiguous.exp: list ambiguous_fun
...

The test-case contains two static functions ambiguous_fun, one in
list-ambiguous0.c and one in list-ambiguous1.c.

The list command is supposed to show both, but only the one from
list-ambiguous0.c is shown.

This is due to the section check in find_pc_sect_compunit_symtab.  It checks
whether the candidate compunit_symtab contains a symbol that has the required
section.  This check is only done for GLOBAL_BLOCK symbols.

The check succeeds for the compunit_symtab for list-ambiguous0.c, because it
contains main, but it fails for list-ambiguous0.c because it has no global
symbols.

Fix this by extending the section check to STATIC_BLOCK symbols.

Tested on x86_64-linux.

Committed to trunk.

Thanks,
- Tom

[gdb/testsuite] Fix section matching in find_pc_sect_compunit_symtab

gdb/ChangeLog:

2020-10-27  Tom de Vries  <tdevries@suse.de>

	* symtab.c (find_pc_sect_compunit_symtab): Include STATIC_BLOCK
	symbols in section check.

gdb/testsuite/ChangeLog:

2020-10-27  Tom de Vries  <tdevries@suse.de>

	* gdb.base/list-ambiguous-readnow.exp: New file.

---
 gdb/symtab.c                                      | 18 ++++++++++++------
 gdb/testsuite/gdb.base/list-ambiguous-readnow.exp | 22 ++++++++++++++++++++++
 2 files changed, 34 insertions(+), 6 deletions(-)

diff --git a/gdb/symtab.c b/gdb/symtab.c
index eda33a7eb4..f6e2475800 100644
--- a/gdb/symtab.c
+++ b/gdb/symtab.c
@@ -2954,13 +2954,19 @@ find_pc_sect_compunit_symtab (CORE_ADDR pc, struct obj_section *section)
 	      struct symbol *sym = NULL;
 	      struct block_iterator iter;
 
-	      ALL_BLOCK_SYMBOLS (global_block, iter, sym)
+	      for (int b_index = GLOBAL_BLOCK;
+		   b_index <= STATIC_BLOCK && sym == NULL;
+		   ++b_index)
 		{
-		  fixup_symbol_section (sym, obj_file);
-		  if (matching_obj_sections (SYMBOL_OBJ_SECTION (obj_file,
-								 sym),
-					     section))
-		    break;
+		  const struct block *b = BLOCKVECTOR_BLOCK (bv, b_index);
+		  ALL_BLOCK_SYMBOLS (b, iter, sym)
+		    {
+		      fixup_symbol_section (sym, obj_file);
+		      if (matching_obj_sections (SYMBOL_OBJ_SECTION (obj_file,
+								     sym),
+						 section))
+			break;
+		    }
 		}
 	      if (sym == NULL)
 		continue;		/* No symbol in this symtab matches
diff --git a/gdb/testsuite/gdb.base/list-ambiguous-readnow.exp b/gdb/testsuite/gdb.base/list-ambiguous-readnow.exp
new file mode 100644
index 0000000000..347a71ba52
--- /dev/null
+++ b/gdb/testsuite/gdb.base/list-ambiguous-readnow.exp
@@ -0,0 +1,22 @@
+# Copyright 2020 Free Software Foundation, Inc.
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+# Run list-ambiguous.exp with -readnow.
+
+save_vars { GDBFLAGS } {
+    append GDBFLAGS " -readnow"
+
+    source $srcdir/$subdir/list-ambiguous.exp
+}