Introduce process_stratum_target

This adds a base class that all process_stratum targets inherit from.

default_thread_address_space/default_thread_architecture only make
sense for process_stratum targets, so they are transformed to
process_stratum_target methods/overrides.

gdb/ChangeLog:
2018-11-30  Pedro Alves  <palves@redhat.com>

	* Makefile.in (COMMON_SFILES): Add process-stratum-target.c.
	* bsd-kvm.c: Include "process-stratum-target.h".
	(bsd_kvm_target): Now inherits from process_stratum_target.
	(bsd_kvm_target::bsd_kvm_target): Default it.
	* corelow.c: Include "process-stratum-target.h".
	(core_target): Now inherits from process_stratum_target.
	(core_target::core_target): Don't set to_stratum here.
	* inf-child.c (inf_child_target::inf_child_target): Delete.
	* inf-child.h: Include "process-stratum-target.h".
	(inf_child_target): Inherit from process_stratum_target.
	(inf_child_target) <inf_child_target>: Default it.
	<can_async_p, supports_non_stop, supports_disable_randomization>:
	Delete overrides.
	* process-stratum-target.c: New file.
	* process-stratum-target.h: New file.
	* remote-sim.c: Include "process-stratum-target.h".
	(gdbsim_target): Inherit from process_stratum_target.
	<gdbsim_target>: Default it.
	* remote.c: Include "process-stratum-target.h".
	(remote_target): Inherit from process_stratum_target.
	<remote_target>: Default it.
	* target.c (default_thread_address_space)
	(default_thread_architecture): Delete.
	* target.h (target_ops) <thread_architecture>: Now returns NULL by
	default.
	<thread_address_space>: Ditto.
	* test-target.h: Include "process-stratum-target.h" instead of
	"target.h".
	(test_target_ops): Inherit from process_stratum_target.
	<test_target_ops>: Default it.
	* tracefile.c (tracefile_target::tracefile_target): Delete.
	* tracefile.h: Include "process-stratum-target.h".
	(tracefile_target): Inherit from process_stratum_target.
	<tracefile_target>: Default it.
	* target-delegates.c: Regenerate.

1 files changed, 49 insertions, 0 deletions

diff --git a/gdb/process-stratum-target.c b/gdb/process-stratum-target.c
new file mode 100644
index 0000000..9ce8d3d
--- /dev/null
+++ b/gdb/process-stratum-target.c
@@ -0,0 +1,49 @@
+/* Abstract base class inherited by all process_stratum targets
+
+   Copyright (C) 2018 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/>.  */
+
+#include "defs.h"
+#include "process-stratum-target.h"
+#include "inferior.h"
+
+process_stratum_target::~process_stratum_target ()
+{
+}
+
+struct address_space *
+process_stratum_target::thread_address_space (ptid_t ptid)
+{
+  /* Fall-back to the "main" address space of the inferior.  */
+  inferior *inf = find_inferior_ptid (ptid);
+
+  if (inf == NULL || inf->aspace == NULL)
+    internal_error (__FILE__, __LINE__,
+		    _("Can't determine the current "
+		      "address space of thread %s\n"),
+		    target_pid_to_str (ptid));
+
+  return inf->aspace;
+}
+
+struct gdbarch *
+process_stratum_target::thread_architecture (ptid_t ptid)
+{
+  inferior *inf = find_inferior_ptid (ptid);
+  gdb_assert (inf != NULL);
+  return inf->gdbarch;
+}