PR 16253 revisited

Last year a patch was submitted/approved/commited to eliminate
symbol_matches_domain which was causing this problem.  It was later reverted
because it introduced a (severe) performance regression.

Recap:

(gdb) list
1	enum e {A,B,C} e;
2	int main (void) { return 0; }
3
(gdb) p e
Attempt to use a type name as an expression

The parser attempts to find a symbol named "e" of VAR_DOMAIN.
This gets passed down through lookup_symbol and (eventually) into
block_lookup_symbol_primary, which iterates over the block's dictionary
of symbols:

  for (sym = dict_iter_name_first (block->dict, name, &dict_iter);
       sym != NULL;
       sym = dict_iter_name_next (name, &dict_iter))
    {
      if (symbol_matches_domain (SYMBOL_LANGUAGE (sym),
                                 SYMBOL_DOMAIN (sym), domain))
        return sym;
    }

The problem here is that we have a symbol named "e" in both STRUCT_DOMAIN
and VAR_DOMAIN, and for languages like C++, Java, and Ada, where a tag name
may be used as an implicit typedef of the type, symbol_matches_domain ignores
the difference between VAR_DOMAIN and STRUCT_DOMAIN.  As it happens, the
STRUCT_DOMAIN symbol is found first, considered a match, and that symbol is
returned to the parser, eliciting the (now dreaded) error message.

Since this bug exists specifically because we have both STRUCT and VAR_DOMAIN
symbols in a given block/CU, this patch rather simply/naively changes
block_lookup_symbol_primary so that it continues to search for an exact
domain match on the symbol if symbol_matches_domain returns a symbol
which does not exactly match the requested domain.

This "fixes" the immediate problem, but admittedly might uncover other,
related bugs.  [Paranoia?] However, it causes no regressions (functional
or performance) in the test suite.  A similar change has been made
to block_lookup_symbol for other cases in which this bug might appear.

The tests from the previous submission have been resurrected and updated.
However since we can still be given a matching symbol with a different domain
than requested, we cannot say that a symbol "was not found."  The error
messages today will still be the (dreaded) "Attempt to use a type name..."

ChangeLog

	PR 16253
	* block.c (block_lookup_symbol): For non-function blocks,
	continue to search for a symbol with an exact domain match
	Otherwise, return any previously found "best domain" symbol.
	(block_lookup_symbol_primary): Likewise.

testsuite/ChangeLog

	PR 16253
	* gdb.cp/var-tag-2.cc: New file.
	* gdb.cp/var-tag-3.cc: New file.
	* gdb.cp/var-tag-4.cc: New file.
	* gdb.cp/var-tag.cc: New file.
	* gdb.cp/var-tag.exp: New file.

1 files changed, 22 insertions, 0 deletions

diff --git a/gdb/testsuite/gdb.cp/var-tag-3.cc b/gdb/testsuite/gdb.cp/var-tag-3.cc
new file mode 100644
index 0000000..7f2133f
--- /dev/null
+++ b/gdb/testsuite/gdb.cp/var-tag-3.cc
@@ -0,0 +1,22 @@
+/* This testcase is part of GDB, the GNU debugger.
+
+   Copyright 2015 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/>.  */
+
+/* This object is in a separate file so that its debug info is not
+   expanded at startup.  Once debug info is expanded we are no longer
+   exercising block_lookup_symbol, and instead are exercising
+   block_lookup_symbol_primary.  */
+struct S2 {} S2;