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, 51 insertions, 0 deletions

diff --git a/gdb/process-stratum-target.h b/gdb/process-stratum-target.h
new file mode 100644
index 0000000..0a799f7
--- /dev/null
+++ b/gdb/process-stratum-target.h
@@ -0,0 +1,51 @@
+/* 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/>.  */
+
+#ifndef PROCESS_STRATUM_TARGET_H
+#define PROCESS_STRATUM_TARGET_H
+
+#include "target.h"
+
+/* Abstract base class inherited by all process_stratum targets.  */
+
+class process_stratum_target : public target_ops
+{
+public:
+  process_stratum_target ()
+  {
+    to_stratum = process_stratum;
+  }
+
+  ~process_stratum_target () override = 0;
+
+  /* We must default these because they must be implemented by any
+     target that can run.  */
+  bool can_async_p () override { return false; }
+  bool supports_non_stop () override { return false; }
+  bool supports_disable_randomization () override { return false; }
+
+  /* This default implementation returns the inferior's address
+     space.  */
+  struct address_space *thread_address_space (ptid_t ptid) override;
+
+  /* This default implementation always returns target_gdbarch ().  */
+  struct gdbarch *thread_architecture (ptid_t ptid) override;
+};
+
+#endif /* !defined (PROCESS_STRATUM_TARGET_H) */