Make the interpreters be per UI

Make each UI have its own interpreter list, top level interpreter,
current interpreter, etc.  The "interpreter_async" global is not
really specific to an struct interp (it crosses interpreter-exec ...),
so I moved it to "struct ui" directly, while the other globals were
left hidden in interps.c, opaque to the rest of GDB.

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

	* breakpoint.c (bpstat_do_actions_1): Access the current UI's
	async field instead of the interpreter_async global.
	* cli/cli-script.c (execute_user_command, while_command)
	(if_command, script_from_file): Likewise.
	* compile/compile.c: Include top.h instead of interps.h.
	(compile_file_command, compile_code_command)
	(compile_print_command): Access the current UI's async field
	instead of the interpreter_async global.
	* guile/guile.c: Include top.h instead of interps.h.
	(guile_repl_command, guile_command, gdbscm_execute_gdb_command):
	Access the current UI's async field instead of the
	interpreter_async global.
	* guile/scm-ports.c: Include top.h instead of interps.h.
	(ioscm_with_output_to_port_worker): Access the current UI's async
	field instead of the interpreter_async global.
	* inf-loop.c (inferior_event_handler): Likewise.
	* infcall.c (run_inferior_call): Likewise.
	* infrun.c (reinstall_readline_callback_handler_cleanup)
	(fetch_inferior_event): Likewise.
	* interps.c (interpreter_async): Delete.
	(struct ui_interp_info): New.
	(get_current_interp_info): New function.
	(interp_list, current_interpreter, top_level_interpreter_ptr):
	Delete.
	(interp_add, interp_set, interp_lookup, interp_ui_out)
	(current_interp_set_logging, interp_set_temp)
	(current_interp_named_p): Adjust to per-UI interpreters.
	(command_interpreter): Delete.
	(command_interp, current_interp_command_loop, interp_quiet_p)
	(interp_exec, interpreter_exec_cmd, interpreter_completer)
	(top_level_interpreter, top_level_interpreter_data): Adjust to
	per-UI interpreters.
	* interps.h (interpreter_async): Delete.
	* main.c (captured_command_loop): Access the current UI's async
	field instead of the interpreter_async global.
	* python/python.c (python_interactive_command, python_command)
	(execute_gdb_command): Likewise.
	* top.c (maybe_wait_sync_command_done, execute_command_to_string):
	Access the current UI's async field instead of the
	interpreter_async global.
	* top.h (struct tl_interp_info): Forward declare.
	(struct ui) <interp_info, async>: New fields.

1 files changed, 15 insertions, 0 deletions

diff --git a/gdb/top.h b/gdb/top.h
index d404427..f18b79e 100644
--- a/gdb/top.h
+++ b/gdb/top.h
@@ -23,6 +23,8 @@
 #include "buffer.h"
 #include "event-loop.h"
 
+struct tl_interp_info;
+
 /* All about a user interface instance.  Each user interface has its
    own I/O files/streams, readline state, its own top level
    interpreter (for the main UI, this is the interpreter specified
@@ -50,6 +52,19 @@ struct ui
      processing.  */
   void (*input_handler) (char *);
 
+  /* Each UI has its own independent set of interpreters.  */
+  struct ui_interp_info *interp_info;
+
+  /* True if the UI is in async mode, false if in sync mode.  If in
+     sync mode, a synchronous execution command (e.g, "next") does not
+     return until the command is finished.  If in async mode, then
+     running a synchronous command returns right after resuming the
+     target.  Waiting for the command's completion is later done on
+     the top event loop.  For the main UI, this starts out disabled,
+     until all the explicit command line arguments (e.g., `gdb -ex
+     "start" -ex "next"') are processed.  */
+  int async;
+
   /* The fields below that start with "m_" are "private".  They're
      meant to be accessed through wrapper macros that make them look
      like globals.  */