+2016-06-21 Pedro Alves <palves@redhat.com>
+
+ * event-top.c: Update readline-related comments.
+ (input_handler, call_readline): Delete globals.
+ (gdb_rl_callback_handler): Call the current UI's input_handler
+ method.
+ (change_line_handler): Adjust to set current UI's properties
+ instead of globals.
+ (current_ui_, current_ui): New globals.
+ (get_command_line_buffer): Rewrite to refer to the current UI.
+ (stdin_event_handler): Adjust to call the call_readline method of
+ the current UI.
+ (gdb_readline_no_editing_callback): Adjust to call the current UI's
+ input_handler method.
+ (gdb_setup_readline): Adjust to set current UI's properties
+ instead of globals.
+ * event-top.h (call_readline, input_handler): Delete declarations.
+ * mi/mi-interp.c (mi_interpreter_resume): Adjust to set current
+ UI's properties instead of globals.
+ * top.c (gdb_readline_wrapper_cleanup): Adjust to set current UI's
+ properties instead of globals.
+ (gdb_readline_wrapper): Adjust to call and set current UI's
+ methods instead of globals.
+ * top.h: Include buffer.h and event-loop.h.
+ (struct ui): New struct.
+ (current_ui): New declaration.
+
2016-06-21 Pedro Alves <palves@redhat.com>
* ada-lang.c (ada_exception_name_addr_1): Add comment.
#endif
static void async_sigterm_handler (gdb_client_data arg);
-/* Readline offers an alternate interface, via callback
- functions. These are all included in the file callback.c in the
- readline distribution. This file provides (mainly) a function, which
- the event loop uses as callback (i.e. event handler) whenever an event
- is detected on the standard input file descriptor.
- readline_callback_read_char is called (by the GDB event loop) whenever
- there is a new character ready on the input stream. This function
- incrementally builds a buffer internal to readline where it
- accumulates the line read up to the point of invocation. In the
- special case in which the character read is newline, the function
- invokes a GDB supplied callback routine, which does the processing of
- a full command line. This latter routine is the asynchronous analog
- of the old command_line_input in gdb. Instead of invoking (and waiting
- for) readline to read the command line and pass it back to
- command_loop for processing, the new command_line_handler function has
- the command line already available as its parameter. INPUT_HANDLER is
- to be set to the function that readline will invoke when a complete
- line of input is ready. CALL_READLINE is to be set to the function
- that readline offers as callback to the event_loop. */
-
-void (*input_handler) (char *);
-void (*call_readline) (gdb_client_data);
+/* Instead of invoking (and waiting for) readline to read the command
+ line and pass it back for processing, we use readline's alternate
+ interface, via callback functions, so that the event loop can react
+ to other event sources while we wait for input. */
/* Important variables for the event loop. */
gdb_rl_callback_handler (char *rl)
{
struct gdb_exception gdb_rl_expt = exception_none;
+ struct ui *ui = current_ui;
TRY
{
- input_handler (rl);
+ ui->input_handler (rl);
}
CATCH (ex, RETURN_MASK_ALL)
{
static void
change_line_handler (void)
{
+ struct ui *ui = current_ui;
+
/* NOTE: this operates on input_fd, not instream. If we are reading
commands from a file, instream will point to the file. However in
async mode, we always read commands from a file with editing
if (async_command_editing_p)
{
/* Turn on editing by using readline. */
- call_readline = gdb_rl_callback_read_char_wrapper;
- input_handler = command_line_handler;
+ ui->call_readline = gdb_rl_callback_read_char_wrapper;
+ ui->input_handler = command_line_handler;
}
else
{
/* Turn off editing by using gdb_readline_no_editing_callback. */
gdb_rl_callback_handler_remove ();
- call_readline = gdb_readline_no_editing_callback;
+ ui->call_readline = gdb_readline_no_editing_callback;
/* Set up the command handler as well, in case we are called as
first thing from .gdbinit. */
- input_handler = command_line_handler;
+ ui->input_handler = command_line_handler;
}
}
return xstrdup (prompt);
}
-/* Get a pointer to the command line buffer. This is used to
+static struct ui current_ui_;
+struct ui *current_ui = ¤t_ui_;
+
+/* Get a pointer to the current UI's line buffer. This is used to
construct a whole line of input from partial input. */
static struct buffer *
get_command_line_buffer (void)
{
- static struct buffer line_buffer;
- static int line_buffer_initialized;
-
- if (!line_buffer_initialized)
- {
- buffer_init (&line_buffer);
- line_buffer_initialized = 1;
- }
-
- return &line_buffer;
+ return ¤t_ui->line_buffer;
}
/* When there is an event ready on the stdin file descriptor, instead
void
stdin_event_handler (int error, gdb_client_data client_data)
{
+ struct ui *ui = current_ui;
+
if (error)
{
printf_unfiltered (_("error detected on stdin\n"));
do
{
call_stdin_event_handler_again_p = 0;
- (*call_readline) (client_data);
+ ui->call_readline (client_data);
} while (call_stdin_event_handler_again_p != 0);
}
}
char *result;
struct buffer line_buffer;
static int done_once = 0;
+ struct ui *ui = current_ui;
buffer_init (&line_buffer);
break;
}
xfree (buffer_finish (&line_buffer));
- (*input_handler) (0);
+ ui->input_handler (NULL);
return;
}
buffer_grow_char (&line_buffer, '\0');
result = buffer_finish (&line_buffer);
- (*input_handler) (result);
+ ui->input_handler (result);
}
\f
void
gdb_setup_readline (void)
{
+ struct ui *ui = current_ui;
+
/* This function is a noop for the sync case. The assumption is
that the sync setup is ALL done in gdb_init, and we would only
mess it up here. The sync stuff should really go away over
/* When a character is detected on instream by select or poll,
readline will be invoked via this callback function. */
- call_readline = gdb_rl_callback_read_char_wrapper;
+ ui->call_readline = gdb_rl_callback_read_char_wrapper;
}
else
{
async_command_editing_p = 0;
- call_readline = gdb_readline_no_editing_callback;
+ ui->call_readline = gdb_readline_no_editing_callback;
}
/* When readline has read an end-of-line character, it passes the
complete line to gdb for processing; command_line_handler is the
function that does this. */
- input_handler = command_line_handler;
-
+ ui->input_handler = command_line_handler;
+
/* Tell readline to use the same input stream that gdb uses. */
rl_instream = instream;
static void
gdb_readline_wrapper_cleanup (void *arg)
{
+ struct ui *ui = current_ui;
struct gdb_readline_wrapper_cleanup *cleanup
= (struct gdb_readline_wrapper_cleanup *) arg;
rl_already_prompted = cleanup->already_prompted_orig;
- gdb_assert (input_handler == gdb_readline_wrapper_line);
- input_handler = cleanup->handler_orig;
+ gdb_assert (ui->input_handler == gdb_readline_wrapper_line);
+ ui->input_handler = cleanup->handler_orig;
/* Don't restore our input handler in readline yet. That would make
readline prep the terminal (putting it in raw mode), while the
char *
gdb_readline_wrapper (const char *prompt)
{
+ struct ui *ui = current_ui;
struct cleanup *back_to;
struct gdb_readline_wrapper_cleanup *cleanup;
char *retval;
cleanup = XNEW (struct gdb_readline_wrapper_cleanup);
- cleanup->handler_orig = input_handler;
- input_handler = gdb_readline_wrapper_line;
+ cleanup->handler_orig = ui->input_handler;
+ ui->input_handler = gdb_readline_wrapper_line;
cleanup->already_prompted_orig = rl_already_prompted;
#ifndef TOP_H
#define TOP_H
-struct buffer;
+#include "buffer.h"
+#include "event-loop.h"
+
+/* 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
+ with -i on the command line) and secondary interpreters (for
+ interpreter-exec ...), etc. There's always one UI associated with
+ stdin/stdout/stderr, but the user can create secondary UIs, for
+ example, to create a separate MI channel on its own stdio
+ streams. */
+
+struct ui
+{
+ /* The UI's command line buffer. This is to used to accumulate
+ input until we have a whole command line. */
+ struct buffer line_buffer;
+
+ /* The callback used by the event loop whenever an event is detected
+ on the UI's input file descriptor. This function incrementally
+ builds a buffer where it accumulates the line read up to the
+ point of invocation. In the special case in which the character
+ read is newline, the function invokes the INPUT_HANDLER callback
+ (see below). */
+ void (*call_readline) (gdb_client_data);
+
+ /* The function to invoke when a complete line of input is ready for
+ processing. */
+ void (*input_handler) (char *);
+};
+
+extern struct ui *current_ui;
/* From top.c. */
extern char *saved_command_line;
projects / deliverable / binutils-gdb.git / commitdiff
