Push thread->control.command_interp to the struct thread_fsm

I noticed that if we step into an inline function, step_1 never
reaches proceed, and thus nevers sets the thread's
tp->control.command_interp.  Because of that,
should_print_stop_to_console fails to determine that is should print
stop output to the console.

The fix is to set the thread's command_interp earlier.  However, I
realized that we can move that field to the thread_fsm, given that its
lifetime is exactly the same as thread_fsm.  So the patch plumbs all
fsms constructors to take the command interp and store it in the
thread_fsm.

We can see the fix in action, with e.g., the gdb.opt/inline-cmds.exp
test, and issuing a step when stopped at line 67:

 &"s\n"
 ^running
 *running,thread-id="all"
 (gdb)
 ~"67\t  result = func2 ();\n"
 *stopped,reason="end-stepping-range",frame={addr="0x00000000004004d0",func="main",args=[],file="/home/pedro/gdb/mygit/src/gdb/testsuite/gdb.opt/inline-cmds.c",fullname="/home/pedro/gdb/mygit/src/gdb/testsuite/gdb.opt/inline-cmds.c",line="67"},thread-id="1",stopped-threads="all",core="0"
 (gdb)
 s
 &"s\n"
 ^running
 *running,thread-id="all"
 (gdb)
+ ~"func2 () at /home/pedro/gdb/mygit/src/gdb/testsuite/gdb.opt/inline-cmds.c:67\n"
+ ~"67\t  result = func2 ();\n"
 *stopped,reason="end-stepping-range",frame={addr="0x00000000004004d0",func="func2",args=[],file="/home/pedro/gdb/mygit/src/gdb/testsuite/gdb.opt/inline-cmds.c",fullname="/home/pedro/gdb/mygit/src/gdb/testsuite/gdb.opt/inline-cmds.c",line="67"},thread-id="1",stopped-threads="all",core="0"
 (gdb)

(The inline-cmds.exp command is adjusted to exercise this.)

(Due to the follow_fork change, this also fixes "next N" across a fork
with "set follow-fork child" with "set detach-on-fork on".  Commands
that rely on internal breakpoints, like "finish" will still require
more work to migrate breakpoints etc. to the child thread.)

gdb/ChangeLog:
2016-06-21  Pedro Alves  <palves@redhat.com>

	* breakpoint.c (new_until_break_fsm): Add 'cmd_interp' parameter.
	(until_break_fsm_should_stop, until_break_fsm_clean_up): Add
	thread parameter.
	(until_break_command): Pass command interpreter to thread fsm
	ctor.
	* cli/cli-interp.c (should_print_stop_to_console): Adjust.
	* gdbthread.h (struct thread_control_state) <command_interp>:
	Delete field.
	* infcall.c (new_call_thread_fsm): Add 'cmd_interp' parameter.
	Pass it down.
	(call_thread_fsm_should_stop): Add thread parameter.
	(call_function_by_hand_dummy): Pass command interpreter to thread
	fsm ctor.  Pass thread pointer to fsm clean up method.
	* infcmd.c: Include interps.h.
	(struct step_command_fsm) <thread>: Delete field.
	(new_step_command_fsm): Add 'cmd_interp' parameter.  Pass it down.
	(step_command_fsm_prepare): Remove references to fsm's thread
	field.
	(step_1): Pass command interpreter to thread
	fsm ctor.  Pass thread pointer to fsm clean up method.
	(step_command_fsm_should_stop, step_command_fsm_clean_up): Add
	thread parameter and use it.
	(new_until_next_fsm): Add 'cmd_interp' parameter.  Pass it down.
	(until_next_fsm_should_stop, until_next_fsm_clean_up): Add thread
	parameter and use it.
	(until_next_command): Pass command interpreter to thread fsm ctor.
	(struct finish_command_fsm) <thread>: Delete field.
	(finish_command_fsm_ops): Add NULL slot for should_notify_stop.
	(new_finish_command_fsm): Add 'cmd_interp' parameter and pass it
	down.  Remove thread parameter and adjust.
	(finish_command_fsm_should_stop, finish_command_fsm_clean_up): Add
	thread parameter and use it.
	(finish_command): Pass command interpreter to thread fsm ctor.
	Don't pass thread.
	* infrun.c (follow_fork): Move thread fsm to child fork instead of
	command interpreter, only.
	(clear_proceed_status_thread): Remove reference to command_interp.
	(proceed): Don't record the thread's command interpreter.
	(clean_up_just_stopped_threads_fsms): Pass thread to fsm clean_up
	method.
	(fetch_inferior_event): Pass thread to fsm should_stop method.
	* thread-fsm.c (thread_fsm_ctor): Add 'cmd_interp' parameter.
	Store it.
	(thread_fsm_clean_up, thread_fsm_should_stop): Add thread
	parameter and pass it down.
	* thread-fsm.h (struct thread_fsm) <command_interp>: New field.
	(struct thread_fsm_ops) <clean_up, should_stop>: Add thread
	parameter.
	(thread_fsm_ctor): Add 'cmd_interp' parameter.
	(thread_fsm_clean_up, thread_fsm_should_stop): Add thread
	parameter.
	* thread.c (thread_cancel_execution_command): Pass thread to
	thread fsm clean_up method.

gdb/testsuite/ChangeLog:
2016-06-21  Pedro Alves  <palves@redhat.com>

	* gdb.opt/inline-cmds.c: Add "set mi break here" marker.
	* gdb.opt/inline-cmds.exp: Add MI tests.

1 files changed, 17 insertions, 6 deletions

diff --git a/gdb/thread-fsm.h b/gdb/thread-fsm.h
index b0f4c44c9a3..86fb81fd3d3 100644
--- a/gdb/thread-fsm.h
+++ b/gdb/thread-fsm.h
@@ -35,6 +35,14 @@ struct thread_fsm
 
   /* Whether the FSM is done successfully.  */
   int finished;
+
+  /* The interpreter that issued the execution command that caused
+     this thread to resume.  If the top level interpreter is MI/async,
+     and the execution command was a CLI command (next/step/etc.),
+     we'll want to print stop event output to the MI console channel
+     (the stepped-to line, etc.), as if the user entered the execution
+     command on a real GDB console.  */
+  struct interp *command_interp;
 };
 
 /* The virtual table of a thread_fsm.  */
@@ -49,7 +57,7 @@ struct thread_fsm_ops
   /* Called to clean up target resources after the FSM.  E.g., if the
      FSM created internal breakpoints, this is where they should be
      deleted.  */
-  void (*clean_up) (struct thread_fsm *self);
+  void (*clean_up) (struct thread_fsm *self, struct thread_info *thread);
 
   /* Called after handle_inferior_event decides the target is done
      (that is, after stop_waiting).  The FSM is given a chance to
@@ -58,7 +66,7 @@ struct thread_fsm_ops
      should be re-resumed.  This is a good place to cache target data
      too.  For example, the "finish" command saves the just-finished
      function's return value here.  */
-  int (*should_stop) (struct thread_fsm *self);
+  int (*should_stop) (struct thread_fsm *self, struct thread_info *thread);
 
   /* If this FSM saved a function's return value, you can use this
      method to retrieve it.  Otherwise, this returns NULL.  */
@@ -72,17 +80,20 @@ struct thread_fsm_ops
   int (*should_notify_stop) (struct thread_fsm *self);
 };
 /* Initialize FSM.  */
-extern void thread_fsm_ctor (struct thread_fsm *fsm,
-			     struct thread_fsm_ops *ops);
+extern void thread_fsm_ctor (struct thread_fsm *self,
+			     struct thread_fsm_ops *ops,
+			     struct interp *cmd_interp);
 
 /* Calls the FSM's dtor method, and then frees FSM.  */
 extern void thread_fsm_delete (struct thread_fsm *fsm);
 
 /* Calls the FSM's clean_up method.  */
-extern void thread_fsm_clean_up (struct thread_fsm *fsm);
+extern void thread_fsm_clean_up (struct thread_fsm *fsm,
+				 struct thread_info *thread);
 
 /* Calls the FSM's should_stop method.  */
-extern int thread_fsm_should_stop (struct thread_fsm *fsm);
+extern int thread_fsm_should_stop (struct thread_fsm *fsm,
+				   struct thread_info *thread);
 
 /* Calls the FSM's return_value method.  */
 extern struct return_value_info *