Add Ada scope test for DAP

This adds a DAP test for fetching scopes and variables with an Ada
program.  This test is the reason that the FrameVars code does not
check is_constant on the symbols it returns.

Note that this test also shows that string-printing is incorrect in
Ada.  This is a known bug but I'm still considering how to fix it.

4 files changed, 154 insertions, 0 deletions

diff --git a/gdb/testsuite/gdb.dap/ada-scopes.exp b/gdb/testsuite/gdb.dap/ada-scopes.exp
new file mode 100644
index 0000000..75d51f9
--- /dev/null
+++ b/gdb/testsuite/gdb.dap/ada-scopes.exp
@@ -0,0 +1,84 @@
+# Copyright 2023 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
+load_lib dap-support.exp
+
+require allow_ada_tests allow_dap_tests
+
+standard_ada_testfile prog
+
+if {[gdb_compile_ada "${srcfile}" "${binfile}" executable \
+	 {debug additional_flags=-gnata}] != ""} {
+    return -1
+}
+
+if {[dap_launch $binfile] == ""} {
+    return
+}
+
+set line [gdb_get_line_number "STOP"]
+set obj [dap_check_request_and_response "set breakpoint" \
+	     setBreakpoints \
+	     [format {o source [o path [%s]] \
+			  breakpoints [a [o line [i %d]]]} \
+		  [list s $srcfile] $line]]
+set fn_bpno [dap_get_breakpoint_number $obj]
+
+dap_check_request_and_response "start inferior" configurationDone
+
+dap_wait_for_event_and_check "stopped at breakpoint" stopped \
+    "body reason" breakpoint \
+    "body hitBreakpointIds" $fn_bpno
+
+set bt [lindex [dap_check_request_and_response "backtrace" stackTrace \
+		    {o threadId [i 1]}] \
+	    0]
+set frame_id [dict get [lindex [dict get $bt body stackFrames] 0] id]
+
+set scopes [dap_check_request_and_response "get scopes" scopes \
+		[format {o frameId [i %d]} $frame_id]]
+set scopes [dict get [lindex $scopes 0] body scopes]
+
+# This is what the implementation does, so we can assume it, but check
+# just in case something changes.
+lassign $scopes scope _ignore
+gdb_assert {[dict get $scope name] == "Locals"} "scope is locals"
+
+gdb_assert {[dict get $scope namedVariables] == 2} "two vars in scope"
+
+set num [dict get $scope variablesReference]
+set refs [lindex [dap_check_request_and_response "fetch variables" \
+		      "variables" \
+		      [format {o variablesReference [i %d] count [i 2]} \
+			   $num]] \
+	      0]
+
+foreach var [dict get $refs body variables] {
+    set name [dict get $var name]
+
+    switch $name {
+	"value" {
+	    gdb_assert {[dict get $var value] == "three"} "check value of value"
+	}
+	"my_string" {
+	}
+	default {
+	    fail "unknown variable $name"
+	}
+    }
+}
+
+dap_shutdown
diff --git a/gdb/testsuite/gdb.dap/ada-scopes/pack.adb b/gdb/testsuite/gdb.dap/ada-scopes/pack.adb
new file mode 100644
index 0000000..a97a829
--- /dev/null
+++ b/gdb/testsuite/gdb.dap/ada-scopes/pack.adb
@@ -0,0 +1,23 @@
+--  Copyright 2023 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 Pack is
+
+   procedure Do_Nothing (A : System.Address) is
+   begin
+      null;
+   end Do_Nothing;
+
+end Pack;
diff --git a/gdb/testsuite/gdb.dap/ada-scopes/pack.ads b/gdb/testsuite/gdb.dap/ada-scopes/pack.ads
new file mode 100644
index 0000000..3a6721d
--- /dev/null
+++ b/gdb/testsuite/gdb.dap/ada-scopes/pack.ads
@@ -0,0 +1,21 @@
+--  Copyright 2023 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 Pack is
+
+   procedure Do_Nothing (A : System.Address);
+
+end Pack;
diff --git a/gdb/testsuite/gdb.dap/ada-scopes/prog.adb b/gdb/testsuite/gdb.dap/ada-scopes/prog.adb
new file mode 100644
index 0000000..5f6ccd5
--- /dev/null
+++ b/gdb/testsuite/gdb.dap/ada-scopes/prog.adb
@@ -0,0 +1,26 @@
+--  Copyright 2023 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 Pack; use Pack;
+
+procedure Foo is
+   type Enum_Type is (one, two, three);
+   Value : Enum_Type := three;
+
+   My_String : constant String := "Hello World";
+begin
+   Do_Nothing (Value'address);
+   Do_Nothing (My_String'address);  -- STOP
+end Foo;