Convert default_child_has_foo functions to process_stratum_target methods

This patch converts the default_child_has_foo functions to
process_stratum_target methods.  This simplifies "regular"
non-inf_child process_stratum targets, since they no longer have to
override the target_ops::has_foo methods to call the default_child_foo
functions.  A couple targets need to override the new defaults
(corelow and tracefiles), but it still seems like a good tradeoff,
since those are expected to be little different (target doesn't run).

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

	* corelow.c (core_target) <has_all_memory, has_execution>: New
	overrides.
	* inf-child.c (inf_child_target::has_all_memory)
	(inf_child_target::has_memory, inf_child_target::has_stack)
	(inf_child_target::has_registers)
	(inf_child_target::has_execution): Delete.
	* inf-child.h (inf_child_target) <has_all_memory, has_memory,
	has_stack, has_registers, has_execution>: Delete.
	* process-stratum-target.c
	(process_stratum_target::has_all_memory)
	(process_stratum_target::has_memory)
	(process_stratum_target::has_stack)
	(process_stratum_target::has_registers)
	(process_stratum_target::has_execution): New.
	* process-stratum-target.h (process_stratum_target)
	<has_all_memory, has_memory, has_stack, has_registers,
	has_execution>: New method overrides.
	* ravenscar-thread.c (ravenscar_thread_target) <has_all_memory,
	has_memory, has_stack, has_registers, has_execution>: Delete.
	* remote-sim.c (gdbsim_target) <has_stack, has_registers,
	has_execution>: Delete.
	* remote.c (remote_target) <has_all_memory, has_memory, has_stack,
	has_registers, has_execution>: Delete.
	* target.c (default_child_has_all_memory)
	(default_child_has_memory, default_child_has_stack)
	(default_child_has_registers, default_child_has_execution):
	Delete.
	* target.h (default_child_has_all_memory)
	(default_child_has_memory, default_child_has_stack)
	(default_child_has_registers, default_child_has_execution):
	Delete.
	* tracefile.h (tracefile_target) <has_execution>: New override.

12 files changed, 83 insertions, 121 deletions

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index faed74b..8fdf04a 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,5 +1,40 @@
 2018-11-30  Pedro Alves  <palves@redhat.com>
 
+	* corelow.c (core_target) <has_all_memory, has_execution>: New
+	overrides.
+	* inf-child.c (inf_child_target::has_all_memory)
+	(inf_child_target::has_memory, inf_child_target::has_stack)
+	(inf_child_target::has_registers)
+	(inf_child_target::has_execution): Delete.
+	* inf-child.h (inf_child_target) <has_all_memory, has_memory,
+	has_stack, has_registers, has_execution>: Delete.
+	* process-stratum-target.c
+	(process_stratum_target::has_all_memory)
+	(process_stratum_target::has_memory)
+	(process_stratum_target::has_stack)
+	(process_stratum_target::has_registers)
+	(process_stratum_target::has_execution): New.
+	* process-stratum-target.h (process_stratum_target)
+	<has_all_memory, has_memory, has_stack, has_registers,
+	has_execution>: New method overrides.
+	* ravenscar-thread.c (ravenscar_thread_target) <has_all_memory,
+	has_memory, has_stack, has_registers, has_execution>: Delete.
+	* remote-sim.c (gdbsim_target) <has_stack, has_registers,
+	has_execution>: Delete.
+	* remote.c (remote_target) <has_all_memory, has_memory, has_stack,
+	has_registers, has_execution>: Delete.
+	* target.c (default_child_has_all_memory)
+	(default_child_has_memory, default_child_has_stack)
+	(default_child_has_registers, default_child_has_execution):
+	Delete.
+	* target.h (default_child_has_all_memory)
+	(default_child_has_memory, default_child_has_stack)
+	(default_child_has_registers, default_child_has_execution):
+	Delete.
+	* tracefile.h (tracefile_target) <has_execution>: New override.
+
+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.
diff --git a/gdb/corelow.c b/gdb/corelow.c
index deabf84..7cc177c9 100644
--- a/gdb/corelow.c
+++ b/gdb/corelow.c
@@ -90,9 +90,12 @@ public:
 
   const char *thread_name (struct thread_info *) override;
 
+  bool has_all_memory () override { return false; }
   bool has_memory () override;
   bool has_stack () override;
   bool has_registers () override;
+  bool has_execution (ptid_t) override { return false; }
+
   bool info_proc (const char *, enum info_proc_what) override;
 
   /* A few helpers.  */
diff --git a/gdb/inf-child.c b/gdb/inf-child.c
index 8cdfa05..fc70445 100644
--- a/gdb/inf-child.c
+++ b/gdb/inf-child.c
@@ -243,36 +243,6 @@ inf_child_target::pid_to_exec_file (int pid)
   return NULL;
 }
 
-bool
-inf_child_target::has_all_memory ()
-{
-  return default_child_has_all_memory ();
-}
-
-bool
-inf_child_target::has_memory ()
-{
-  return default_child_has_memory ();
-}
-
-bool
-inf_child_target::has_stack ()
-{
-  return default_child_has_stack ();
-}
-
-bool
-inf_child_target::has_registers ()
-{
-  return default_child_has_registers ();
-}
-
-bool
-inf_child_target::has_execution (ptid_t ptid)
-{
-  return default_child_has_execution (ptid);
-}
-
 /* Implementation of to_fileio_open.  */
 
 int
diff --git a/gdb/inf-child.h b/gdb/inf-child.h
index d301d39..a0bb40b 100644
--- a/gdb/inf-child.h
+++ b/gdb/inf-child.h
@@ -72,12 +72,6 @@ public:
 
   char *pid_to_exec_file (int pid) override;
 
-  bool has_all_memory () override;
-  bool has_memory () override;
-  bool has_stack () override;
-  bool has_registers () override;
-  bool has_execution (ptid_t) override;
-
   int fileio_open (struct inferior *inf, const char *filename,
 		   int flags, int mode, int warn_if_slow,
 		   int *target_errno) override;
diff --git a/gdb/process-stratum-target.c b/gdb/process-stratum-target.c
index 9ce8d3d..ca9d13a 100644
--- a/gdb/process-stratum-target.c
+++ b/gdb/process-stratum-target.c
@@ -47,3 +47,39 @@ process_stratum_target::thread_architecture (ptid_t ptid)
   gdb_assert (inf != NULL);
   return inf->gdbarch;
 }
+
+bool
+process_stratum_target::has_all_memory ()
+{
+  /* If no inferior selected, then we can't read memory here.  */
+  return inferior_ptid != null_ptid;
+}
+
+bool
+process_stratum_target::has_memory ()
+{
+  /* If no inferior selected, then we can't read memory here.  */
+  return inferior_ptid != null_ptid;
+}
+
+bool
+process_stratum_target::has_stack ()
+{
+  /* If no inferior selected, there's no stack.  */
+  return inferior_ptid != null_ptid;
+}
+
+bool
+process_stratum_target::has_registers ()
+{
+  /* Can't read registers from no inferior.  */
+  return inferior_ptid != null_ptid;
+}
+
+bool
+process_stratum_target::has_execution (ptid_t the_ptid)
+{
+  /* If there's no thread selected, then we can't make it run through
+     hoops.  */
+  return the_ptid != null_ptid;
+}
diff --git a/gdb/process-stratum-target.h b/gdb/process-stratum-target.h
index 0a799f7..74640aa 100644
--- a/gdb/process-stratum-target.h
+++ b/gdb/process-stratum-target.h
@@ -46,6 +46,14 @@ public:
 
   /* This default implementation always returns target_gdbarch ().  */
   struct gdbarch *thread_architecture (ptid_t ptid) override;
+
+  /* Default implementations for process_stratum targets.  Return true
+     if there's a selected inferior, false otherwise.  */
+  bool has_all_memory () override;
+  bool has_memory () override;
+  bool has_stack () override;
+  bool has_registers () override;
+  bool has_execution (ptid_t the_ptid) override;
 };
 
 #endif /* !defined (PROCESS_STRATUM_TARGET_H) */
diff --git a/gdb/ravenscar-thread.c b/gdb/ravenscar-thread.c
index e60fad8..0f2889c 100644
--- a/gdb/ravenscar-thread.c
+++ b/gdb/ravenscar-thread.c
@@ -116,13 +116,6 @@ struct ravenscar_thread_target final : public target_ops
   ptid_t get_ada_task_ptid (long lwp, long thread) override;
 
   void mourn_inferior () override;
-
-  bool has_all_memory ()  override { return default_child_has_all_memory (); }
-  bool has_memory ()  override { return default_child_has_memory (); }
-  bool has_stack ()  override { return default_child_has_stack (); }
-  bool has_registers ()  override { return default_child_has_registers (); }
-  bool has_execution (ptid_t ptid) override
-  { return default_child_has_execution (ptid); }
 };
 
 /* This module's target-specific operations.  */
diff --git a/gdb/remote-sim.c b/gdb/remote-sim.c
index 1ceecaa..b3fb95a 100644
--- a/gdb/remote-sim.c
+++ b/gdb/remote-sim.c
@@ -128,15 +128,6 @@ struct gdbsim_target final
 
   bool has_all_memory ()  override;
   bool has_memory ()  override;
-
-  bool has_stack ()  override
-  { return default_child_has_stack (); }
-
-  bool has_registers ()  override
-  { return default_child_has_registers (); }
-
-  bool has_execution (ptid_t ptid) override
-  { return default_child_has_execution (ptid); }
 };
 
 static struct gdbsim_target gdbsim_ops;
diff --git a/gdb/remote.c b/gdb/remote.c
index ae35bec..4324452 100644
--- a/gdb/remote.c
+++ b/gdb/remote.c
@@ -525,12 +525,6 @@ public:
 				      CORE_ADDR load_module_addr,
 				      CORE_ADDR offset) override;
 
-  bool has_all_memory ()  override { return default_child_has_all_memory (); }
-  bool has_memory ()  override { return default_child_has_memory (); }
-  bool has_stack ()  override { return default_child_has_stack (); }
-  bool has_registers ()  override { return default_child_has_registers (); }
-  bool has_execution (ptid_t ptid)  override { return default_child_has_execution (ptid); }
-
   bool can_execute_reverse () override;
 
   std::vector<mem_region> memory_map () override;
diff --git a/gdb/target.c b/gdb/target.c
index 8905ce3..ecfdde9 100644
--- a/gdb/target.c
+++ b/gdb/target.c
@@ -186,60 +186,6 @@ target_command (const char *arg, int from_tty)
 		  gdb_stdout);
 }
 
-/* Default target_has_* methods for process_stratum targets.  */
-
-int
-default_child_has_all_memory ()
-{
-  /* If no inferior selected, then we can't read memory here.  */
-  if (inferior_ptid == null_ptid)
-    return 0;
-
-  return 1;
-}
-
-int
-default_child_has_memory ()
-{
-  /* If no inferior selected, then we can't read memory here.  */
-  if (inferior_ptid == null_ptid)
-    return 0;
-
-  return 1;
-}
-
-int
-default_child_has_stack ()
-{
-  /* If no inferior selected, there's no stack.  */
-  if (inferior_ptid == null_ptid)
-    return 0;
-
-  return 1;
-}
-
-int
-default_child_has_registers ()
-{
-  /* Can't read registers from no inferior.  */
-  if (inferior_ptid == null_ptid)
-    return 0;
-
-  return 1;
-}
-
-int
-default_child_has_execution (ptid_t the_ptid)
-{
-  /* If there's no thread selected, then we can't make it run through
-     hoops.  */
-  if (the_ptid == null_ptid)
-    return 0;
-
-  return 1;
-}
-
-
 int
 target_has_all_memory_1 (void)
 {
diff --git a/gdb/target.h b/gdb/target.h
index 36f8d5e..b0469bb 100644
--- a/gdb/target.h
+++ b/gdb/target.h
@@ -1790,15 +1790,6 @@ extern int target_has_execution_current (void);
 
 #define target_has_execution target_has_execution_current ()
 
-/* Default implementations for process_stratum targets.  Return true
-   if there's a selected inferior, false otherwise.  */
-
-extern int default_child_has_all_memory ();
-extern int default_child_has_memory ();
-extern int default_child_has_stack ();
-extern int default_child_has_registers ();
-extern int default_child_has_execution (ptid_t the_ptid);
-
 /* Can the target support the debugger control of thread execution?
    Can it lock the thread scheduler?  */
 
diff --git a/gdb/tracefile.h b/gdb/tracefile.h
index 3ae3e7d..8f9dc0e 100644
--- a/gdb/tracefile.h
+++ b/gdb/tracefile.h
@@ -127,6 +127,7 @@ public:
   bool has_memory () override;
   bool has_stack () override;
   bool has_registers () override;
+  bool has_execution (ptid_t) override { return false; }
   bool thread_alive (ptid_t ptid) override;
 };