Ada: Fix missing call to pretty-printer for fields of records.

Consider the following types:

   type Time_T is record
      Secs : Integer;
   end record;
   Before : Time_T := (Secs => 1384395743);

In this example, we assume that type Time_T is the number of seconds
since Epoch, and so added a Python pretty-printer, to print this
type in a more human-friendly way. For instance:

    (gdb) print before
    $1 = Thu Nov 14 02:22:23 2013 (1384395743)

However, we've noticed that things stop working when this type is
embedded inside another record, and we try to print that record.
For instance, with the following declarations:

   type Composite is record
      Id : Integer;
      T : Time_T;
   end record;
   Afternoon : Composite := (Id => 1, T => (Secs => 1384395865));

    (gdb) print afternoon
    $2 = (id => 1, t => (secs => 1384395865))

We expected instead:

    (gdb) print afternoon
    $2 = (id => 1, t => Thu Nov 14 02:24:25 2013 (1384395865))

This patch fixes the problem by making sure that we try to print
each field via a call to val_print, rather than calling ada_val_print
directly. We need to go through val_print, as the val_print
handles all language-independent features such as calling the
pretty-printer, knowing that ada_val_print will get called eventually
if actual Ada-specific printing is required (which should be the
most common scenario).

And because val_print takes the language as parameter, we enhanced
the print_field_values and print_variant_part to also take a language.
As a bonus, this allows us to remove a couple of references to
current_language.

gdb/ChangeLog:

        * ada-valprint.c (print_field_values): Add "language" parameter.
        Update calls to print_field_values and print_variant_part.
        Pass new parameter "language" in call to val_print instead
        of "current_language".  Replace call to ada_val_print by call
        to val_print.
        (print_variant_part): Add "language" parameter.
        (ada_val_print_struct_union): Update call to print_field_values.

gdb/testsuite/ChangeLog:

        * gdb.ada/pp-rec-component.exp, gdb.ada/pp-rec-component.py,
        gdb.ada/pp-rec-component/foo.adb, gdb.ada/pp-rec-component/pck.adb,
        gdb.ada/pp-rec-component/pck.ads: New files.

gdb/ChangeLog

@@ -1,3 +1,13 @@
+2014-01-07  Joel Brobecker  <brobecker@adacore.com>
+
+	* ada-valprint.c (print_field_values): Add "language" parameter.
+	Update calls to print_field_values and print_variant_part.
+	Pass new parameter "language" in call to val_print instead
+	of "current_language".  Replace call to ada_val_print by call
+	to val_print.
+	(print_variant_part): Add "language" parameter.
+	(ada_val_print_struct_union): Update call to print_field_values.
+
 2014-01-07  Joel Brobecker  <brobecker@adacore.com>
 
 	* ada-valprint.c (ui_memcpy): Delete.

gdb/ada-valprint.c

@@ -39,7 +39,8 @@ static int print_field_values (struct type *, const gdb_byte *,
 			       struct ui_file *, int,
 			       const struct value *,
 			       const struct value_print_options *,
-			       int, struct type *, int);
+			       int, struct type *, int,
+			       const struct language_defn *);
 
 
 /* Make TYPE unsigned if its range of values includes no negatives.  */
@@ -536,7 +537,8 @@ print_variant_part (struct type *type, int field_num,
 		    const struct value *val,
 		    const struct value_print_options *options,
 		    int comma_needed,
-		    struct type *outer_type, int outer_offset)
+		    struct type *outer_type, int outer_offset,
+		    const struct language_defn *language)
 {
   struct type *var_type = TYPE_FIELD_TYPE (type, field_num);
   int which = ada_which_variant_applies (var_type, outer_type,
@@ -551,7 +553,7 @@ print_variant_part (struct type *type, int field_num,
        offset + TYPE_FIELD_BITPOS (type, field_num) / HOST_CHAR_BIT
        + TYPE_FIELD_BITPOS (var_type, which) / HOST_CHAR_BIT,
        stream, recurse, val, options,
-       comma_needed, outer_type, outer_offset);
+       comma_needed, outer_type, outer_offset, language);
 }
 
 /* Print out fields of value at VALADDR + OFFSET having structure type TYPE.
@@ -575,7 +577,8 @@ print_field_values (struct type *type, const gdb_byte *valaddr,
 		    const struct value *val,
 		    const struct value_print_options *options,
 		    int comma_needed,
-		    struct type *outer_type, int outer_offset)
+		    struct type *outer_type, int outer_offset,
+		    const struct language_defn *language)
 {
   int i, len;
 
@@ -594,7 +597,7 @@ print_field_values (struct type *type, const gdb_byte *valaddr,
 				(offset
 				 + TYPE_FIELD_BITPOS (type, i) / HOST_CHAR_BIT),
 				stream, recurse, val, options,
-				comma_needed, type, offset);
+				comma_needed, type, offset, language);
 	  continue;
 	}
       else if (ada_is_variant_part (type, i))
@@ -603,7 +606,7 @@ print_field_values (struct type *type, const gdb_byte *valaddr,
 	    print_variant_part (type, i, valaddr,
 				offset, stream, recurse, val,
 				options, comma_needed,
-				outer_type, outer_offset);
+				outer_type, outer_offset, language);
 	  continue;
 	}
 
@@ -657,7 +660,7 @@ print_field_values (struct type *type, const gdb_byte *valaddr,
 			 value_contents_for_printing (v),
 			 value_embedded_offset (v), 0,
 			 stream, recurse + 1, v,
-			 &opts, current_language);
+			 &opts, language);
 	    }
 	}
       else
@@ -665,11 +668,9 @@ print_field_values (struct type *type, const gdb_byte *valaddr,
 	  struct value_print_options opts = *options;
 
 	  opts.deref_ref = 0;
-	  ada_val_print (TYPE_FIELD_TYPE (type, i),
-			 valaddr,
-			 (offset
-			  + TYPE_FIELD_BITPOS (type, i) / HOST_CHAR_BIT),
-			 0, stream, recurse + 1, val, &opts);
+	  val_print (TYPE_FIELD_TYPE (type, i), valaddr,
+		     (offset + TYPE_FIELD_BITPOS (type, i) / HOST_CHAR_BIT),
+		     0, stream, recurse + 1, val, &opts, language);
 	}
       annotate_field_end ();
     }
@@ -963,7 +964,7 @@ ada_val_print_struct_union
 
   if (print_field_values (type, valaddr, offset_aligned,
 			  stream, recurse, original_value, options,
-			  0, type, offset_aligned) != 0
+			  0, type, offset_aligned, language) != 0
       && options->prettyformat)
     {
       fprintf_filtered (stream, "\n");

gdb/testsuite/ChangeLog

@@ -1,3 +1,9 @@
+2014-01-07  Joel Brobecker  <brobecker@adacore.com>
+
+	* gdb.ada/pp-rec-component.exp, gdb.ada/pp-rec-component.py,
+	gdb.ada/pp-rec-component/foo.adb, gdb.ada/pp-rec-component/pck.adb,
+	gdb.ada/pp-rec-component/pck.ads: New files.
+
 2014-01-07  Joel Brobecker  <brobecker@adacore.com>
 
 	* gdb.python/py-pp-integral.c: New file.

gdb/testsuite/gdb.ada/pp-rec-component.exp

@@ -0,0 +1,40 @@
+# Copyright 2014 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]] != "" } {
+  return -1
+}
+
+clean_restart ${testfile}
+
+# Skip all tests if Python scripting is not enabled.
+if { [skip_python_tests] } { continue }
+
+set remote_python_file \
+    [gdb_remote_download host ${srcdir}/${subdir}/${gdb_test_file_name}.py]
+gdb_test_no_output "source ${remote_python_file}"
+
+set bp_location [gdb_get_line_number "BREAK" ${testdir}/foo.adb]
+runto "foo.adb:$bp_location"
+
+gdb_test "print before" \
+         " = Thu Nov 14 02:22:23 2013 \\(1384395743\\)"
+
+gdb_test "print /r before" \
+         " = \\(secs => 1384395743\\)"

gdb/testsuite/gdb.ada/pp-rec-component.py

@@ -0,0 +1,35 @@
+# Copyright (C) 2014 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/>.
+
+from time import asctime, gmtime
+import gdb  # silence pyflakes
+
+
+class TimeTPrinter:
+    def __init__(self, val):
+        self.val = val
+
+    def to_string(self):
+        secs = int(self.val['secs'])
+        return "%s (%d)" % (asctime(gmtime(secs)), secs)
+
+
+def time_sniffer(val):
+    if val.type.tag == "pck__time_t":
+        return TimeTPrinter(val)
+    return None
+
+
+gdb.pretty_printers.append(time_sniffer)

gdb/testsuite/gdb.ada/pp-rec-component/foo.adb

@@ -0,0 +1,22 @@
+--  Copyright 2014 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; use Pck;
+
+procedure Foo is
+   Before : Time_T := (Secs => 1384395743);
+begin
+   Do_Nothing (Before'Address);  -- BREAK
+end Foo;

gdb/testsuite/gdb.ada/pp-rec-component/pck.adb

@@ -0,0 +1,21 @@
+--  Copyright 2014 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;

gdb/testsuite/gdb.ada/pp-rec-component/pck.ads

@@ -0,0 +1,23 @@
+--  Copyright 2014 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
+   type Time_T is record
+      Secs : Integer;
+   end record;
+   procedure Do_Nothing (A : System.Address);
+end Pck;