Fix pascal behavior for class fields with testcase

  Problem reported as PR pascal/17815

Part 1/3: Remember the case pattern that allowed finding a field of this.
File gdb/p-exp.y modified

  This is the fix in the pascal parser (p-exp.y),
to avoid the error that GDB does find normal variables
case insensitively, but not fields of this,
inside a class or object method.

Part 2/3: Add "class" option for pascal compiler
File gdb/testsuite/lib/pascal.exp

This part of the patch series is unchanged.
It adds class option to pascal compiler
which adds the required command line option to
accept pascal class types.

Part 3/3:
New file: gdb/testsuite/gdb.pascal/case-insensitive-symbols.exp
New file: gdb/testsuite/gdb.pascal/case-insensitive-symbols.pas

  Here is an updated version of this test, using Pedro's suggestions.
Test to check that PR 17815 is fixed.

2 files changed, 121 insertions, 0 deletions

diff --git a/gdb/testsuite/gdb.pascal/case-insensitive-symbols.exp b/gdb/testsuite/gdb.pascal/case-insensitive-symbols.exp
new file mode 100644
index 0000000000..4f1d1502e9
--- /dev/null
+++ b/gdb/testsuite/gdb.pascal/case-insensitive-symbols.exp
@@ -0,0 +1,58 @@
+# 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/>.
+
+load_lib "pascal.exp"
+
+standard_testfile .pas
+
+if {[gdb_compile_pascal "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable [list debug class]] != "" } {
+    untested $testfile.exp
+    return -1
+}
+
+clean_restart ${testfile}
+set bp_location [gdb_get_line_number "set breakpoint here"]
+
+if { ![runto ${srcfile}:${bp_location}] } {
+    return 0
+}
+
+# We are now inside CHECK method.
+gdb_test "p X" " = 67"
+gdb_test "p B.X" " = 11"
+gdb_test "p Y" " = 33"
+gdb_test "p B.Y" " = 35"
+# As A is global, we can also check its value.
+gdb_test "p A.X" " = 67"
+gdb_test "p A.Y" " = 33"
+# Now test lowercase version.
+gdb_test "p x" " = 67"
+gdb_test "p y" " = 33"
+gdb_test "p B.x" " = 11"
+gdb_test "p B.y" " = 35"
+# As A is global, we can also check its value, with lowercase.
+gdb_test "p A.x" " = 67"
+gdb_test "p A.y" " = 33"
+# Also test lowercase class names.
+gdb_test "p b.X" " = 11"
+gdb_test "p b.x" " = 11"
+gdb_test "p b.Y" " = 35"
+gdb_test "p b.y" " = 35"
+gdb_test "p a.X" " = 67"
+gdb_test "p a.x" " = 67"
+gdb_test "p a.Y" " = 33"
+gdb_test "p a.y" " = 33"
+
+gdb_exit
diff --git a/gdb/testsuite/gdb.pascal/case-insensitive-symbols.pas b/gdb/testsuite/gdb.pascal/case-insensitive-symbols.pas
new file mode 100644
index 0000000000..74abea498e
--- /dev/null
+++ b/gdb/testsuite/gdb.pascal/case-insensitive-symbols.pas
@@ -0,0 +1,63 @@
+{
+ 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/>.
+}
+
+
+program test_gdb_17815;
+
+
+type
+  TA = class
+  public
+  x, y : integer;
+  constructor Create;
+  function check(b : TA) : boolean;
+  destructor Done; virtual;
+end;
+
+constructor TA.Create;
+begin
+  x:=-1;
+  y:=-1;
+end;
+
+destructor TA.Done;
+begin
+end;
+
+function TA.check (b : TA) : boolean;
+begin
+  check:=(x < b.x); { set breakpoint here }
+end;
+
+
+
+var
+  a, b : TA;
+
+begin
+  a:=TA.Create;
+  b:=TA.Create;
+  a.x := 67;
+  a.y := 33;
+  b.x := 11;
+  b.y := 35;
+  if a.check (b) then
+    writeln('Error in check')
+  else
+    writeln('check OK');
+end.
+