DW_AT_data_location and DW_OP_push_object_address testcase.

This testcase allows us to test the proper processing of both
DW_AT_data_location and DW_OP_push_object_address using a hand-crafted
testcase duplicating how we expect the Ada compiler to represent
unbounded arrays.

gdb/testsuite/ChangeLog:

        * gdb.dwarf2/data-loc.c, gdb.dwarf2/data-loc.exp: New files.

3 files changed, 241 insertions, 0 deletions

diff --git a/gdb/testsuite/ChangeLog b/gdb/testsuite/ChangeLog
index 553f695..a90d85e 100644
--- a/gdb/testsuite/ChangeLog
+++ b/gdb/testsuite/ChangeLog
@@ -1,3 +1,7 @@
+2014-08-18  Joel Brobecker  <brobecker@adacore.com>
+
+	* gdb.dwarf2/data-loc.c, gdb.dwarf2/data-loc.exp: New files.
+
 2014-08-15  Siva Chandra Reddy  <sivachandra@google.com>
 
 	PR c++/17132
diff --git a/gdb/testsuite/gdb.dwarf2/data-loc.c b/gdb/testsuite/gdb.dwarf2/data-loc.c
new file mode 100644
index 0000000..ebb9a51
--- /dev/null
+++ b/gdb/testsuite/gdb.dwarf2/data-loc.c
@@ -0,0 +1,46 @@
+/* Copyright 2014 Free Software Foundation, Inc.
+
+   This file is part of GDB.
+
+   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 C file provides some global variables laid out in a way
+   that mimicks what the GNAT Ada compiler calls "fat pointers".
+   These fat pointers are the memory representation used by
+   the compiler to handle dynamic arrays.
+
+   Debugging information on how to decode that data into an array
+   will be generated separately by the testcase using that file.  */
+
+struct fat_pointer
+{
+  int *data;
+  int *bounds;
+};
+
+int table_1_data[] = {1, 2, 3};
+int table_1_bounds[] = {1, 3};
+struct fat_pointer table_1 = {table_1_data, table_1_bounds};
+
+int table_2_data[] = {5, 8, 13, 21, 34};
+int table_2_bounds[] = {2, 6};
+struct fat_pointer table_2 = {table_2_data, table_2_bounds};
+
+int
+main (void)
+{
+  table_1.bounds[1] = 2;
+  table_2.bounds[1] = 3;
+  return 0;
+}
diff --git a/gdb/testsuite/gdb.dwarf2/data-loc.exp b/gdb/testsuite/gdb.dwarf2/data-loc.exp
new file mode 100644
index 0000000..859962a
--- /dev/null
+++ b/gdb/testsuite/gdb.dwarf2/data-loc.exp
@@ -0,0 +1,191 @@
+# 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 dwarf.exp
+
+# This test can only be run on targets which support DWARF-2 and use gas.
+if {![dwarf2_support]} {
+    return 0
+}
+
+standard_testfile data-loc.c data-loc-dw.S
+
+# We need to know the size of integer and address types in order
+# to write some of the debugging info we'd like to generate.
+#
+# For that, we ask GDB by debugging our data-loc.c program.
+# Any program would do, but since we already have data-loc.c
+# specifically for this testcase, might as well use that.
+
+if { [prepare_for_testing ${testfile}.exp ${testfile} ${srcfile}] } {
+    untested ${testfile}.exp
+    return -1
+}
+
+# Make some DWARF for the test.
+set asm_file [standard_output_file $srcfile2]
+Dwarf::assemble $asm_file {
+    cu {} {
+ 	DW_TAG_compile_unit {
+                {DW_AT_language @DW_LANG_Ada95}
+                {DW_AT_name     foo.adb}
+                {DW_AT_comp_dir /tmp}
+        } {
+            declare_labels integer_label array_label
+
+            integer_label: DW_TAG_base_type {
+                {DW_AT_byte_size 4 DW_FORM_sdata}
+                {DW_AT_encoding  @DW_ATE_signed}
+                {DW_AT_name      integer}
+            }
+
+	    array_label: DW_TAG_array_type {
+		{DW_AT_name foo__array_type}
+		{DW_AT_type :$integer_label}
+                {DW_AT_data_location {
+                    DW_OP_push_object_address
+                    DW_OP_deref
+                } SPECIAL_expr}
+                {external 1 flag}
+	    } {
+		DW_TAG_subrange_type {
+		    {DW_AT_type        :$integer_label}
+                    {DW_AT_lower_bound {
+                        DW_OP_push_object_address
+                        DW_OP_plus_uconst [get_sizeof "void *" 96]
+                        DW_OP_deref
+                        DW_OP_deref_size [get_sizeof "int" 4]
+                    } SPECIAL_expr}
+                    {DW_AT_upper_bound {
+                        DW_OP_push_object_address
+                        DW_OP_plus_uconst [get_sizeof "void *" 96]
+                        DW_OP_deref
+                        DW_OP_plus_uconst [get_sizeof "int" 4]
+                        DW_OP_deref_size [get_sizeof "int" 4]
+                    } SPECIAL_expr}
+		    {DW_AT_upper_bound 5 DW_FORM_data1}
+		}
+	    }
+            DW_TAG_typedef {
+                {DW_AT_name foo__array_type}
+                {DW_AT_type :$array_label}
+            }
+            DW_TAG_variable {
+                {DW_AT_name foo__three}
+                {DW_AT_type :$array_label}
+                {DW_AT_location {
+                    DW_OP_addr table_1
+                } SPECIAL_expr}
+                {external 1 flag}
+            }
+            DW_TAG_variable {
+                {DW_AT_name foo__five}
+                {DW_AT_type :$array_label}
+                {DW_AT_location {
+                    DW_OP_addr table_2
+                } SPECIAL_expr}
+                {external 1 flag}
+            }
+	}
+    }
+}
+
+# Now that we've generated the DWARF debugging info, rebuild our
+# program using our debug info instead of the info generated by
+# the compiler.
+
+if { [prepare_for_testing ${testfile}.exp ${testfile} \
+	  [list $srcfile $asm_file] {nodebug}] } {
+    return -1
+}
+
+if ![runto_main] {
+    return -1
+}
+
+gdb_test_no_output "set language ada"
+
+gdb_test "print foo.three" \
+         " = \\(1, 2, 3\\)"
+
+gdb_test "ptype foo.three" \
+         "type = array \\(1 .. 3\\) of integer"
+
+gdb_test "print foo.three(1)" \
+         " = 1"
+
+gdb_test "print foo.three(2)" \
+         " = 2"
+
+gdb_test "print foo.three(3)" \
+         " = 3"
+
+gdb_test "print foo.three'first" \
+         " = 1"
+
+gdb_test "print foo.three'last" \
+         " = 3"
+
+gdb_test "print foo.three'length" \
+         " = 3"
+
+gdb_test "print foo.five" \
+         " = \\(2 => 5, 8, 13, 21, 34\\)"
+
+gdb_test "ptype foo.five" \
+         "type = array \\(2 .. 6\\) of integer"
+
+gdb_test "ptype foo.array_type" \
+         "type = array \\(<>\\) of integer"
+
+gdb_test "print foo.five(2)" \
+         " = 5"
+
+gdb_test "print foo.five(3)" \
+         " = 8"
+
+gdb_test "print foo.five(4)" \
+         " = 13"
+
+gdb_test "print foo.five(5)" \
+         " = 21"
+
+gdb_test "print foo.five(6)" \
+         " = 34"
+
+gdb_test "print foo.five'first" \
+         " = 2"
+
+gdb_test "print foo.five'last" \
+         " = 6"
+
+gdb_test "print foo.five'length" \
+         " = 5"
+
+gdb_test_no_output "set lang c"
+
+gdb_test "print foo__three" \
+         " = \\{1, 2, 3\\}"
+
+gdb_test "ptype foo__three" \
+         "type = integer \\\[3\\\]"
+
+gdb_test "print foo__five" \
+         " = \\{5, 8, 13, 21, 34\\}"
+
+gdb_test "ptype foo__five" \
+         "type = integer \\\[5\\\]"
+
+gdb_test "ptype foo__array_type" \
+         "type = integer \\\[variable length\\\]"