Fix Ada "ptype" bug with array types

Using ptype on an array type in Ada can sometimes show an incorrect
high bound.  This happens because ada_evaluate_subexp will create an
array with an incorrect upper bound in the EVAL_AVOID_SIDE_EFFECTS
case.

This patch fixes the problem by arranging to always create such an
array with valid bounds.

Tested on x86-64 Fedora 29.

gdb/ChangeLog
2019-03-18  Tom Tromey  <tromey@adacore.com>

	* ada-lang.c (empty_array): Add "high" parameter.
	(ada_evaluate_subexp): Update.

gdb/testsuite/ChangeLog
2019-03-18  Joel Brobecker  <brobecker@adacore.com>
	    Tom Tromey  <tromey@adacore.com>

	* gdb.ada/ptype_array/pck.adb: New file.
	* gdb.ada/ptype_array/pck.ads: New file.
	* gdb.ada/ptype_array/foo.adb: New file.
	* gdb.ada/ptype_array.exp: New file.

5 files changed, 116 insertions, 0 deletions

diff --git a/gdb/testsuite/ChangeLog b/gdb/testsuite/ChangeLog
index 523013b..e0bed87 100644
--- a/gdb/testsuite/ChangeLog
+++ b/gdb/testsuite/ChangeLog
@@ -1,3 +1,11 @@
+2019-03-18  Joel Brobecker  <brobecker@adacore.com>
+	    Tom Tromey  <tromey@adacore.com>
+
+	* gdb.ada/ptype_array/pck.adb: New file.
+	* gdb.ada/ptype_array/pck.ads: New file.
+	* gdb.ada/ptype_array/foo.adb: New file.
+	* gdb.ada/ptype_array.exp: New file.
+
 2019-03-14  Tom Tromey  <tromey@adacore.com>
 
 	* gdb.base/style.exp: Add "set style sources" test.
diff --git a/gdb/testsuite/gdb.ada/ptype_array.exp b/gdb/testsuite/gdb.ada/ptype_array.exp
new file mode 100644
index 0000000..ec75d14
--- /dev/null
+++ b/gdb/testsuite/gdb.ada/ptype_array.exp
@@ -0,0 +1,34 @@
+# Copyright 2019 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/>.
+
+load_lib "ada.exp"
+
+standard_ada_testfile foo
+
+if {[gdb_compile_ada "${srcfile}" "${binfile}" executable [list debug additional_flags=-gnat05 ]] != "" } {
+  return -1
+}
+
+clean_restart ${testfile}
+
+runto_main
+
+gdb_test "ptype pck.W.G(1,5).m(2 .. 5)" \
+    "type = array \\(2 \\.\\. 5\\) of character" \
+    "ptype 2..5"
+
+gdb_test "ptype pck.W.G(1,5).m(3 .. 5)" \
+    "type = array \\(3 \\.\\. 5\\) of character" \
+    "ptype 3..5"
diff --git a/gdb/testsuite/gdb.ada/ptype_array/foo.adb b/gdb/testsuite/gdb.ada/ptype_array/foo.adb
new file mode 100644
index 0000000..c1688cb
--- /dev/null
+++ b/gdb/testsuite/gdb.ada/ptype_array/foo.adb
@@ -0,0 +1,21 @@
+--  Copyright 2019 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/>.
+
+with Pck;
+
+procedure Foo is
+begin
+   Pck.Do_Nothing (Pck.W.G'Address);
+end Foo;
diff --git a/gdb/testsuite/gdb.ada/ptype_array/pck.adb b/gdb/testsuite/gdb.ada/ptype_array/pck.adb
new file mode 100644
index 0000000..5a2019a
--- /dev/null
+++ b/gdb/testsuite/gdb.ada/ptype_array/pck.adb
@@ -0,0 +1,23 @@
+--  Copyright 2019 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/>.
+
+package body Pck is
+   procedure Do_Nothing (A : System.Address) is
+   begin
+      null;
+   end Do_Nothing;
+end Pck;
+
+
diff --git a/gdb/testsuite/gdb.ada/ptype_array/pck.ads b/gdb/testsuite/gdb.ada/ptype_array/pck.ads
new file mode 100644
index 0000000..7b81930
--- /dev/null
+++ b/gdb/testsuite/gdb.ada/ptype_array/pck.ads
@@ -0,0 +1,30 @@
+--  Copyright 2019 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/>.
+
+with System;
+
+package Pck is
+   package W is
+      type P is record
+          M : String (2 .. 5);
+      end record;
+
+      type R is array (1 .. 10, 1 .. 20) of P;
+
+      G : R;
+   end W;
+
+   procedure Do_Nothing (A : System.Address);
+end Pck;