Implement DAP setExceptionBreakpoints request

This implements the DAP setExceptionBreakpoints request for Ada.  This
is a somewhat minimal implementation, in that "exceptionOptions" are
not implemented (or advertised) -- I wasn't completely sure how this
feature is supposed to work.

I haven't added C++ exception handling here, but it's easy to do if
needed.

This patch relies on the new MI command execution support to do its
work.

3 files changed, 127 insertions, 0 deletions

diff --git a/gdb/testsuite/gdb.dap/catch-exception.exp b/gdb/testsuite/gdb.dap/catch-exception.exp
new file mode 100644
index 0000000..6bfeb3e
--- /dev/null
+++ b/gdb/testsuite/gdb.dap/catch-exception.exp
@@ -0,0 +1,65 @@
+# 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 gnat_runtime_has_debug_info
+
+standard_ada_testfile prog
+
+if {[gdb_compile_ada "${srcfile}" "${binfile}" executable \
+	 {debug additional_flags=-gnata}] != ""} {
+    return -1
+}
+
+if {[dap_launch $binfile] == ""} {
+    return
+}
+
+set obj [dap_check_request_and_response "set exception catchpoints" \
+	     setExceptionBreakpoints \
+	     {o filters [a [s assert]] \
+		  filterOptions [a [o filterId [s exception] \
+					condition [s "Global_Var = 23"]]]}]
+
+set bps [dict get [lindex $obj 0] body breakpoints]
+gdb_assert {[llength $bps] == 2} "two breakpoints"
+
+# The "path" should never be "null".
+set i 1
+foreach spec $bps {
+    # If "path" does not exist, then that is fine as well.
+    if {![dict exists $spec source path]} {
+	pass "breakpoint $i path"
+    } else {
+	gdb_assert {[dict get $spec source path] != "null"} \
+	    "breakpoint $i path"
+    }
+    incr i
+}
+
+dap_check_request_and_response "start inferior" configurationDone
+
+dap_wait_for_event_and_check "stopped at first raise" stopped \
+    "body reason" breakpoint \
+    "body hitBreakpointIds" 2
+
+dap_check_request_and_response "continue to assert" continue
+dap_wait_for_event_and_check "stopped at assert" stopped \
+    "body reason" breakpoint \
+    "body hitBreakpointIds" 1
+
+dap_shutdown
diff --git a/gdb/testsuite/gdb.dap/catch-exception/pck.ads b/gdb/testsuite/gdb.dap/catch-exception/pck.ads
new file mode 100644
index 0000000..e82a54f
--- /dev/null
+++ b/gdb/testsuite/gdb.dap/catch-exception/pck.ads
@@ -0,0 +1,18 @@
+--  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 Pck is
+   Global_Var : Integer := 91;
+end Pck;
diff --git a/gdb/testsuite/gdb.dap/catch-exception/prog.adb b/gdb/testsuite/gdb.dap/catch-exception/prog.adb
new file mode 100644
index 0000000..287eb24
--- /dev/null
+++ b/gdb/testsuite/gdb.dap/catch-exception/prog.adb
@@ -0,0 +1,44 @@
+--  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 Pck; use Pck;
+
+procedure Prog is
+begin
+
+   begin
+      raise Program_Error;
+   exception
+      when others =>
+         null;
+   end;
+
+   begin
+      Global_Var := 23;
+      raise Program_Error;
+   exception
+      when others =>
+         null;
+   end;
+
+   begin
+      pragma Assert (False);
+      null;
+   exception
+      when others =>
+         null;
+   end;
+
+end Prog;