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[PATCH PR gdb/16841] virtual inheritance via typedef cannot find base


Fix failure to find member of a typedef base class

The test case below demonstrates the problem, as described in this PR's Comment 5:

typedef struct {
        int x;
} A;

struct C : A {
        int y;
};

int main()
{
        C c;
        return 55;
}

$ gdb a.out
(gdb) ptype C::x
Internal error: non-aggregate type to value_struct_elt_for_reference

In value_struct_elt_for_reference(), need to call check_typedef() on
the aggregate type to handle the case of *curtype being ptr->typedef.

Tested on x86_64-linux. No regressions.
---
 gdb/ChangeLog                               |  6 +++++
 gdb/testsuite/ChangeLog                     |  6 +++++
 gdb/testsuite/gdb.cp/typedef-base-ptype.cc  | 30 +++++++++++++++++++++++
 gdb/testsuite/gdb.cp/typedef-base-ptype.exp | 37 +++++++++++++++++++++++++++++
 gdb/valops.c                                |  2 +-
 5 files changed, 80 insertions(+), 1 deletion(-)
 create mode 100644 gdb/testsuite/gdb.cp/typedef-base-ptype.cc
 create mode 100644 gdb/testsuite/gdb.cp/typedef-base-ptype.exp

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index ff2f145..99a3175 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,9 @@
+2018-06-12  Weimin Pan  <weimin.pan@oracle.com>
+
+	PR gdb/16841
+	* valops.c (value_struct_elt_for_reference): Call check_typedef on 
+	aggregate type to get its real type before accessing it.
+
 2018-05-29  Weimin Pan  <weimin.pan@oracle.com>
 
 	* minsyms.h (lookup_minimal_symbol_and_objfile): Remove declaration.
diff --git a/gdb/testsuite/ChangeLog b/gdb/testsuite/ChangeLog
index b2938b1..78771d3 100644
--- a/gdb/testsuite/ChangeLog
+++ b/gdb/testsuite/ChangeLog
@@ -1,3 +1,9 @@
+2018-06-12  Weimin Pan  <weimin.pan@oracle.com>
+
+	PR gdb/16841
+	* gdb/testsuite/gdb.cp/typedef-base-ptype.cc: New file.
+	* gdb/testsuite/gdb.cp/typedef-base-ptype.exp: New file.
+
 2018-05-24  Andrew Burgess  <andrew.burgess@embecosm.com>
 
 	PR gdb/23203
diff --git a/gdb/testsuite/gdb.cp/typedef-base-ptype.cc b/gdb/testsuite/gdb.cp/typedef-base-ptype.cc
new file mode 100644
index 0000000..bfbcc4a
--- /dev/null
+++ b/gdb/testsuite/gdb.cp/typedef-base-ptype.cc
@@ -0,0 +1,30 @@
+/* This testcase is part of GDB, the GNU debugger.
+
+   Copyright 2018 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/>.  */
+
+typedef struct {
+        int x;
+} A;
+
+struct C : A {
+        int y;
+};
+
+int main()
+{
+        C c;
+        return 55;
+}
diff --git a/gdb/testsuite/gdb.cp/typedef-base-ptype.exp b/gdb/testsuite/gdb.cp/typedef-base-ptype.exp
new file mode 100644
index 0000000..e588fd3
--- /dev/null
+++ b/gdb/testsuite/gdb.cp/typedef-base-ptype.exp
@@ -0,0 +1,37 @@
+# Copyright 2018 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/>.
+
+if { [skip_cplus_tests] } { continue }
+
+standard_testfile .cc
+
+if [get_compiler_info "c++"] {
+    return -1
+}
+
+if {[prepare_for_testing "failed to prepare" $testfile $srcfile {debug c++}]} {
+    return -1
+}
+
+clean_restart $testfile
+
+if ![runto_main] {
+    untested "could not run to main"
+    return -1
+}
+
+gdb_test "ptype C::x" \
+         "type = int" \
+         "ptype typedef base struct member"
diff --git a/gdb/valops.c b/gdb/valops.c
index 62a86c0..3970a25 100644
--- a/gdb/valops.c
+++ b/gdb/valops.c
@@ -3343,7 +3343,7 @@ value_struct_elt_for_reference (struct type *domain, int offset,
 				int want_address,
 				enum noside noside)
 {
-  struct type *t = curtype;
+  struct type *t = check_typedef (curtype);
   int i;
   struct value *v, *result;
 
-- 
1.8.3.1


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