[PATCH 2/3] Remove ExecutionInvoker

[Tom Tromey <tromey@adacore.com>]

ExecutionInvoker is no longer really needed, due to the previous DAP
refactoring.  This patch removes it in favor of an ordinary function.
One spot (the 'continue' request) could still have used it, but is
more succinctly expressed as a lambda.
---
 gdb/python/lib/gdb/dap/events.py | 29 +++++++----------------------
 gdb/python/lib/gdb/dap/launch.py |  4 ++--
 gdb/python/lib/gdb/dap/next.py   | 10 +++++-----
 gdb/python/lib/gdb/dap/pause.py  |  4 ++--
 4 files changed, 16 insertions(+), 31 deletions(-)

diff --git a/gdb/python/lib/gdb/dap/events.py b/gdb/python/lib/gdb/dap/events.py
index e9ddcab135f..09214ec3dc8 100644
--- a/gdb/python/lib/gdb/dap/events.py
+++ b/gdb/python/lib/gdb/dap/events.py
@@ -17,7 +17,7 @@ import enum
 import gdb
 
 from .server import send_event
-from .startup import in_gdb_thread, Invoker, log
+from .startup import exec_and_log, in_gdb_thread, log
 from .modules import is_module, make_module
 
 
@@ -111,29 +111,14 @@ _expected_stop = None
 
 
 @in_gdb_thread
-def expect_stop(reason):
-    """Indicate that a stop is expected, for the reason given."""
+def exec_and_expect_stop(cmd, reason):
+    """Indicate that a stop is expected, then execute CMD"""
     global _expected_stop
     _expected_stop = reason
-
-
-# A wrapper for Invoker that also sets the expected stop.
-class ExecutionInvoker(Invoker):
-    """A subclass of Invoker that sets the expected stop.
-    Note that this assumes that the command will restart the inferior,
-    so it will also cause ContinuedEvents to be suppressed."""
-
-    def __init__(self, cmd, expected):
-        super().__init__(cmd)
-        self.expected = expected
-
-    @in_gdb_thread
-    def __call__(self):
-        expect_stop(self.expected)
-        global _suppress_cont
-        _suppress_cont = True
-        # FIXME if the call fails should we clear _suppress_cont?
-        super().__call__()
+    global _suppress_cont
+    _suppress_cont = True
+    # FIXME if the call fails should we clear _suppress_cont?
+    exec_and_log(cmd)
 
 
 @in_gdb_thread
diff --git a/gdb/python/lib/gdb/dap/launch.py b/gdb/python/lib/gdb/dap/launch.py
index e81d2849a8e..ab704c7a7cc 100644
--- a/gdb/python/lib/gdb/dap/launch.py
+++ b/gdb/python/lib/gdb/dap/launch.py
@@ -18,7 +18,7 @@ import gdb
 # These are deprecated in 3.9, but required in older versions.
 from typing import Mapping, Optional, Sequence
 
-from .events import ExecutionInvoker
+from .events import exec_and_expect_stop
 from .server import request, capability
 from .startup import in_gdb_thread, exec_and_log
 
@@ -85,4 +85,4 @@ def config_done(**args):
     if _program is not None:
         # Suppress the continue event, but don't set any particular
         # expected stop.
-        ExecutionInvoker("run", None)()
+        exec_and_expect_stop("run", None)
diff --git a/gdb/python/lib/gdb/dap/next.py b/gdb/python/lib/gdb/dap/next.py
index ddab9d304a1..d12267ea354 100644
--- a/gdb/python/lib/gdb/dap/next.py
+++ b/gdb/python/lib/gdb/dap/next.py
@@ -15,7 +15,7 @@
 
 import gdb
 
-from .events import StopKinds, ExecutionInvoker
+from .events import StopKinds, exec_and_expect_stop
 from .server import capability, request
 from .startup import in_gdb_thread, send_gdb, send_gdb_with_response
 from .state import set_thread
@@ -57,7 +57,7 @@ def next(
     cmd = "next"
     if granularity == "instruction":
         cmd += "i"
-    ExecutionInvoker(cmd, StopKinds.STEP)()
+    exec_and_expect_stop(cmd, StopKinds.STEP)
 
 
 @capability("supportsSteppingGranularity")
@@ -70,13 +70,13 @@ def step_in(
     cmd = "step"
     if granularity == "instruction":
         cmd += "i"
-    ExecutionInvoker(cmd, StopKinds.STEP)()
+    exec_and_expect_stop(cmd, StopKinds.STEP)
 
 
 @request("stepOut", response=False)
 def step_out(*, threadId: int, singleThread: bool = False, **args):
     _handle_thread_step(threadId, singleThread, True)
-    ExecutionInvoker("finish", StopKinds.STEP)()
+    exec_and_expect_stop("finish", StopKinds.STEP)
 
 
 # This is a server-side request because it is funny: it wants to
@@ -87,5 +87,5 @@ def step_out(*, threadId: int, singleThread: bool = False, **args):
 @request("continue", server=True)
 def continue_request(*, threadId: int, singleThread: bool = False, **args):
     locked = send_gdb_with_response(lambda: _handle_thread_step(threadId, singleThread))
-    send_gdb(ExecutionInvoker("continue", None))
+    send_gdb(lambda: exec_and_expect_stop("continue", None))
     return {"allThreadsContinued": not locked}
diff --git a/gdb/python/lib/gdb/dap/pause.py b/gdb/python/lib/gdb/dap/pause.py
index d96172c0757..d276ab1cb92 100644
--- a/gdb/python/lib/gdb/dap/pause.py
+++ b/gdb/python/lib/gdb/dap/pause.py
@@ -13,10 +13,10 @@
 # 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 .events import StopKinds, ExecutionInvoker
+from .events import StopKinds, exec_and_expect_stop
 from .server import request
 
 
 @request("pause", response=False)
 def pause(**args):
-    ExecutionInvoker("interrupt -a", StopKinds.PAUSE)()
+    exec_and_expect_stop("interrupt -a", StopKinds.PAUSE)

-- 
2.41.0