/* TK interface routines.
   Copyright 1994 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 2 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, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */

#include "defs.h"
#include "symtab.h"
#include "inferior.h"
#include "command.h"
#include "bfd.h"
#include "symfile.h"
#include "objfiles.h"
#include "target.h"
#include <tcl.h>
#include <tk.h>
#include <varargs.h>
#include <signal.h>
#include <fcntl.h>
#include <unistd.h>
#include <setjmp.h>
#include "top.h"

/* Non-zero means that we're doing the gdbtk interface. */
int gdbtk = 0;

/* Non-zero means we are reloading breakpoints, etc from the
   Gdbtk kernel, and we should suppress various messages */
static int gdbtk_reloading = 0;

/* Handle for TCL interpreter */
static Tcl_Interp *interp = NULL;

/* Handle for TK main window */
static Tk_Window mainWindow = NULL;

static int x_fd;		/* X network socket */

static void
null_routine(arg)
     int arg;
{
}

static char *saved_output_buf = NULL; /* Start of output buffer */
static char *saved_output_data_end = NULL; /* Ptr to nul at end of data */
static int saved_output_buf_free = 0; /* Amount of free space in buffer */
static char saved_output_static_buf[200]; /* Default buffer */

static void
start_saving_output ()
{
  if (saved_output_buf)
    abort ();			/* Should always be zero at this point */

  saved_output_buf = saved_output_static_buf;
  saved_output_data_end = saved_output_buf;
  *saved_output_data_end = '\000';
  saved_output_buf_free = sizeof saved_output_static_buf - 1;
}

static void
save_output (ptr)
     const char *ptr;
{
  int len;
  int needed, data_len;

  len = strlen (ptr);

  if (len <= saved_output_buf_free)
    {
      strcpy (saved_output_data_end, ptr);
      saved_output_data_end += len;
      saved_output_buf_free -= len;
      return;
    }

  data_len = saved_output_data_end - saved_output_buf;
  needed = (data_len + len + 1) * 2;

  if (saved_output_buf == saved_output_static_buf)
    {
      char *tmp;

      tmp = xmalloc (needed);
      strcpy (tmp, saved_output_buf);
      saved_output_buf = tmp;
    }
  else
    saved_output_buf = xrealloc (saved_output_buf, needed);

  saved_output_data_end = saved_output_buf + data_len;
  saved_output_buf_free = (needed - data_len) - 1;

  save_output (ptr);
}

#define get_saved_output() saved_output_buf

static void
finish_saving_output ()
{
  if (saved_output_buf != saved_output_static_buf)
    free (saved_output_buf);

  saved_output_buf = NULL;
}

/* This routine redirects the output of fputs_unfiltered so that
   the user can see what's going on in his debugger window. */

static char holdbuf[200];
static char *holdbufp = holdbuf;
static int holdfree = sizeof (holdbuf);

static void
flush_holdbuf ()
{
  if (holdbufp == holdbuf)
    return;

  Tcl_VarEval (interp, "gdbtk_tcl_fputs ", "{", holdbuf, "}", NULL);
  holdbufp = holdbuf;
  holdfree = sizeof (holdbuf);
}

static void
gdbtk_flush (stream)
     FILE *stream;
{
  if (stream != gdb_stdout || saved_output_buf)
    return;

  /* Flush output from C to tcl land.  */

  flush_holdbuf ();

  /* Force immediate screen update */

  Tcl_VarEval (interp, "gdbtk_tcl_flush", NULL);
}

static void
gdbtk_fputs (ptr, stream)
     const char *ptr;
     FILE *stream;
{
  int len;

  if (stream != gdb_stdout)
    {
      Tcl_VarEval (interp, "gdbtk_tcl_fputs_error ", "{", ptr, "}", NULL);
      return;
    }

  if (saved_output_buf)
    {
      save_output (ptr);
      return;
    }

  len = strlen (ptr) + 1;

  if (len > holdfree)
    {
      flush_holdbuf ();

      if (len > sizeof (holdbuf))
	{
	  Tcl_VarEval (interp, "gdbtk_tcl_fputs ", "{", ptr, "}", NULL);
	  return;
	}
    }

  strncpy (holdbufp, ptr, len);
  holdbufp += len - 1;
  holdfree -= len - 1;
}

static int
gdbtk_query (args)
     va_list args;
{
  char *query;
  char buf[200];
  long val;

  query = va_arg (args, char *);

  vsprintf(buf, query, args);
  Tcl_VarEval (interp, "gdbtk_tcl_query ", "{", buf, "}", NULL);

  val = atol (interp->result);
  return val;
}

static void
breakpoint_notify(b, action)
     struct breakpoint *b;
     const char *action;
{
  struct symbol *sym;
  char bpnum[50], line[50], pc[50];
  struct symtab_and_line sal;
  char *filename;
  int v;

  if (b->type != bp_breakpoint)
    return;

  sal = find_pc_line (b->address, 0);

  filename = symtab_to_filename (sal.symtab);

  sprintf (bpnum, "%d", b->number);
  sprintf (line, "%d", sal.line);
  sprintf (pc, "0x%x", b->address);
 
  v = Tcl_VarEval (interp,
		   "gdbtk_tcl_breakpoint ",
		   action,
		   " ", bpnum,
		   " ", filename,
		   " ", line,
		   " ", pc,
		   NULL);

  if (v != TCL_OK)
    {
      gdbtk_fputs (interp->result);
      gdbtk_fputs ("\n");
    }
}

static void
gdbtk_create_breakpoint(b)
     struct breakpoint *b;
{
  breakpoint_notify(b, "create");
}

static void
gdbtk_delete_breakpoint(b)
     struct breakpoint *b;
{
  breakpoint_notify(b, "delete");
}

static void
gdbtk_enable_breakpoint(b)
     struct breakpoint *b;
{
  breakpoint_notify(b, "enable");
}

static void
gdbtk_disable_breakpoint(b)
     struct breakpoint *b;
{
  breakpoint_notify(b, "disable");
}

/* This implements the TCL command `gdb_loc', which returns a list consisting
   of the source and line number associated with the current pc. */

static int
gdb_loc (clientData, interp, argc, argv)
     ClientData clientData;
     Tcl_Interp *interp;
     int argc;
     char *argv[];
{
  char *filename;
  char buf[100];
  struct symtab_and_line sal;
  char *funcname;
  CORE_ADDR pc;

  if (argc == 1)
    {
      pc = selected_frame ? selected_frame->pc : stop_pc;
      sal = find_pc_line (pc, 0);
    }
  else if (argc == 2)
    {
      struct symtabs_and_lines sals;
      int nelts;

      sals = decode_line_spec (argv[1], 1);

      nelts = sals.nelts;
      sal = sals.sals[0];
      free (sals.sals);

      if (sals.nelts != 1)
	{
	  Tcl_SetResult (interp, "Ambiguous line spec", TCL_STATIC);
	  return TCL_ERROR;
	}

      pc = sal.pc;
    }
  else
    {
      Tcl_SetResult (interp, "wrong # args", TCL_STATIC);
      return TCL_ERROR;
    }

  if (sal.symtab)
    Tcl_AppendElement (interp, sal.symtab->filename);
  else
    Tcl_AppendElement (interp, "");

  find_pc_partial_function (pc, &funcname, NULL, NULL);
  Tcl_AppendElement (interp, funcname);

  filename = symtab_to_filename (sal.symtab);
  Tcl_AppendElement (interp, filename);

  sprintf (buf, "%d", sal.line);
  Tcl_AppendElement (interp, buf); /* line number */

  sprintf (buf, "0x%x", pc);
  Tcl_AppendElement (interp, buf); /* PC */

  return TCL_OK;
}

/* This implements the TCL command `gdb_sourcelines', which returns a list of
   all of the lines containing executable code for the specified source file
   (ie: lines where you can put breakpoints). */

static int
gdb_sourcelines (clientData, interp, argc, argv)
     ClientData clientData;
     Tcl_Interp *interp;
     int argc;
     char *argv[];
{
  struct symtab *symtab;
  struct linetable_entry *le;
  int nlines;
  char buf[100];

  if (argc != 2)
    {
      Tcl_SetResult (interp, "wrong # args", TCL_STATIC);
      return TCL_ERROR;
    }

  symtab = lookup_symtab (argv[1]);

  if (!symtab)
    {
      Tcl_SetResult (interp, "No such file", TCL_STATIC);
      return TCL_ERROR;
    }

  /* If there's no linetable, or no entries, then we are done. */

  if (!symtab->linetable
      || symtab->linetable->nitems == 0)
    {
      Tcl_AppendElement (interp, "");
      return TCL_OK;
    }

  le = symtab->linetable->item;
  nlines = symtab->linetable->nitems;

  for (;nlines > 0; nlines--, le++)
    {
      /* If the pc of this line is the same as the pc of the next line, then
	 just skip it.  */
      if (nlines > 1
	  && le->pc == (le + 1)->pc)
	continue;

      sprintf (buf, "%d", le->line);
      Tcl_AppendElement (interp, buf);
    }

  return TCL_OK;
}

static int
map_arg_registers (argc, argv, func, argp)
     int argc;
     char *argv[];
     int (*func) PARAMS ((int regnum, void *argp));
     void *argp;
{
  int regnum;

  /* Note that the test for a valid register must include checking the
     reg_names array because NUM_REGS may be allocated for the union of the
     register sets within a family of related processors.  In this case, the
     trailing entries of reg_names will change depending upon the particular
     processor being debugged.  */

  if (argc == 0)		/* No args, just do all the regs */
    {
      for (regnum = 0;
	   regnum < NUM_REGS
	   && reg_names[regnum] != NULL
	   && *reg_names[regnum] != '\000';
	   regnum++)
	func (regnum, argp);

      return TCL_OK;
    }

  /* Else, list of register #s, just do listed regs */
  for (; argc > 0; argc--, argv++)
    {
      regnum = atoi (*argv);

      if (regnum >= 0
	  && regnum < NUM_REGS
	  && reg_names[regnum] != NULL
	  && *reg_names[regnum] != '\000')
	func (regnum, argp);
      else
	{
	  Tcl_SetResult (interp, "bad register number", TCL_STATIC);

	  return TCL_ERROR;
	}
    }

  return TCL_OK;
}

static int
get_register_name (regnum, argp)
     int regnum;
     void *argp;		/* Ignored */
{
  Tcl_AppendElement (interp, reg_names[regnum]);
}

/* This implements the TCL command `gdb_regnames', which returns a list of
   all of the register names. */

static int
gdb_regnames (clientData, interp, argc, argv)
     ClientData clientData;
     Tcl_Interp *interp;
     int argc;
     char *argv[];
{
  argc--;
  argv++;

  return map_arg_registers (argc, argv, get_register_name, 0);
}

#ifndef REGISTER_CONVERTIBLE
#define REGISTER_CONVERTIBLE(x) (0 != 0)
#endif

#ifndef REGISTER_CONVERT_TO_VIRTUAL
#define REGISTER_CONVERT_TO_VIRTUAL(x, y, z, a)
#endif

#ifndef INVALID_FLOAT
#define INVALID_FLOAT(x, y) (0 != 0)
#endif

static int
get_register (regnum, fp)
     void *fp;
{
  char raw_buffer[MAX_REGISTER_RAW_SIZE];
  char virtual_buffer[MAX_REGISTER_VIRTUAL_SIZE];
  int format = (int)fp;

  if (read_relative_register_raw_bytes (regnum, raw_buffer))
    {
      Tcl_AppendElement (interp, "Optimized out");
      return;
    }

  start_saving_output ();	/* Start collecting stdout */

  /* Convert raw data to virtual format if necessary.  */

  if (REGISTER_CONVERTIBLE (regnum))
    {
      REGISTER_CONVERT_TO_VIRTUAL (regnum, REGISTER_VIRTUAL_TYPE (regnum),
				   raw_buffer, virtual_buffer);
    }
  else
    memcpy (virtual_buffer, raw_buffer, REGISTER_VIRTUAL_SIZE (regnum));

  val_print (REGISTER_VIRTUAL_TYPE (regnum), virtual_buffer, 0,
	     gdb_stdout, format, 1, 0, Val_pretty_default);

  Tcl_AppendElement (interp, get_saved_output ());

  finish_saving_output ();	/* Set stdout back to normal */
}

static int
gdb_fetch_registers (clientData, interp, argc, argv)
     ClientData clientData;
     Tcl_Interp *interp;
     int argc;
     char *argv[];
{
  int format;

  if (argc < 2)
    {
      Tcl_SetResult (interp, "wrong # args", TCL_STATIC);
      return TCL_ERROR;
    }

  argc--;
  argv++;

  argc--;
  format = **argv++;

  return map_arg_registers (argc, argv, get_register, format);
}

/* This contains the previous values of the registers, since the last call to
   gdb_changed_register_list.  */

static char old_regs[REGISTER_BYTES];

static int
register_changed_p (regnum, argp)
     void *argp;		/* Ignored */
{
  char raw_buffer[MAX_REGISTER_RAW_SIZE];
  char buf[100];

  if (read_relative_register_raw_bytes (regnum, raw_buffer))
    return;

  if (memcmp (&old_regs[REGISTER_BYTE (regnum)], raw_buffer,
	      REGISTER_RAW_SIZE (regnum)) == 0)
    return;

  /* Found a changed register.  Save new value and return it's number. */

  memcpy (&old_regs[REGISTER_BYTE (regnum)], raw_buffer,
	  REGISTER_RAW_SIZE (regnum));

  sprintf (buf, "%d", regnum);
  Tcl_AppendElement (interp, buf);
}

static int
gdb_changed_register_list (clientData, interp, argc, argv)
     ClientData clientData;
     Tcl_Interp *interp;
     int argc;
     char *argv[];
{
  int format;

  argc--;
  argv++;

  return map_arg_registers (argc, argv, register_changed_p, NULL);
}

/* This implements the TCL command `gdb_cmd', which sends it's argument into
   the GDB command scanner.  */

static int
gdb_cmd (clientData, interp, argc, argv)
     ClientData clientData;
     Tcl_Interp *interp;
     int argc;
     char *argv[];
{
  if (argc != 2)
    {
      Tcl_SetResult (interp, "wrong # args", TCL_STATIC);
      return TCL_ERROR;
    }

  execute_command (argv[1], 1);

  bpstat_do_actions (&stop_bpstat);

  /* Drain all buffered command output */

  gdb_flush (gdb_stdout);

  return TCL_OK;
}

/* This routine acts as a top-level for all GDB code called by tcl/Tk.  It
   handles cleanups, and calls to return_to_top_level (usually via error).
   This is necessary in order to prevent a longjmp out of the bowels of Tk,
   possibly leaving things in a bad state.  Since this routine can be called
   recursively, it needs to save and restore the contents of the jmp_buf as
   necessary.  */

static int
call_wrapper (clientData, interp, argc, argv)
     ClientData clientData;
     Tcl_Interp *interp;
     int argc;
     char *argv[];
{
  int val;
  struct cleanup *saved_cleanup_chain;
  Tcl_CmdProc *func;
  jmp_buf saved_error_return;

  func = (Tcl_CmdProc *)clientData;
  memcpy (saved_error_return, error_return, sizeof (jmp_buf));

  saved_cleanup_chain = save_cleanups ();

  if (!setjmp (error_return))
    val = func (clientData, interp, argc, argv);
  else
    {
      val = TCL_ERROR;		/* Flag an error for TCL */

      finish_saving_output ();	/* Restore stdout to normal */

      gdb_flush (gdb_stderr);	/* Flush error output */

/* In case of an error, we may need to force the GUI into idle mode because
   gdbtk_call_command may have bombed out while in the command routine.  */

      Tcl_VarEval (interp, "gdbtk_tcl_idle", NULL);
    }

  do_cleanups (ALL_CLEANUPS);

  restore_cleanups (saved_cleanup_chain);

  memcpy (error_return, saved_error_return, sizeof (jmp_buf));

  return val;
}

static int
gdb_listfiles (clientData, interp, argc, argv)
     ClientData clientData;
     Tcl_Interp *interp;
     int argc;
     char *argv[];
{
  int val;
  struct objfile *objfile;
  struct partial_symtab *psymtab;

  ALL_PSYMTABS (objfile, psymtab)
    Tcl_AppendElement (interp, psymtab->filename);

  return TCL_OK;
}

static int
gdb_stop (clientData, interp, argc, argv)
     ClientData clientData;
     Tcl_Interp *interp;
     int argc;
     char *argv[];
{
  target_stop ();
}


static void
tk_command (cmd, from_tty)
     char *cmd;
     int from_tty;
{
  Tcl_VarEval (interp, cmd, NULL);

  gdbtk_fputs (interp->result);
  gdbtk_fputs ("\n");
}

static void
cleanup_init (ignored)
     int ignored;
{
  if (mainWindow != NULL)
    Tk_DestroyWindow (mainWindow);
  mainWindow = NULL;

  if (interp != NULL)
    Tcl_DeleteInterp (interp);
  interp = NULL;
}

/* Come here during long calculations to check for GUI events.  Usually invoked
   via the QUIT macro.  */

static void
gdbtk_interactive ()
{
  /* Tk_DoOneEvent (TK_DONT_WAIT|TK_IDLE_EVENTS); */
}

/* Come here when there is activity on the X file descriptor. */

static void
x_event (signo)
     int signo;
{
  /* Process pending events */

  while (Tk_DoOneEvent (TK_DONT_WAIT|TK_ALL_EVENTS) != 0);
}

static int
gdbtk_wait (pid, ourstatus)
     int pid;
     struct target_waitstatus *ourstatus;
{
  signal (SIGIO, x_event);

  pid = target_wait (pid, ourstatus);

  signal (SIGIO, SIG_IGN);

  return pid;
}

/* This is called from execute_command, and provides a wrapper around
   various command routines in a place where both protocol messages and
   user input both flow through.  Mostly this is used for indicating whether
   the target process is running or not.
*/

static void
gdbtk_call_command (cmdblk, arg, from_tty)
     struct cmd_list_element *cmdblk;
     char *arg;
     int from_tty;
{
  if (cmdblk->class == class_run)
    {
      Tcl_VarEval (interp, "gdbtk_tcl_busy", NULL);
      (*cmdblk->function.cfunc)(arg, from_tty);
      Tcl_VarEval (interp, "gdbtk_tcl_idle", NULL);
    }
  else
    (*cmdblk->function.cfunc)(arg, from_tty);
}

static void
gdbtk_init ()
{
  struct cleanup *old_chain;
  char *gdbtk_filename;
  int i;

  old_chain = make_cleanup (cleanup_init, 0);

  /* First init tcl and tk. */

  interp = Tcl_CreateInterp ();

  if (!interp)
    error ("Tcl_CreateInterp failed");

  mainWindow = Tk_CreateMainWindow (interp, NULL, "gdb", "Gdb");

  if (!mainWindow)
    return;			/* DISPLAY probably not set */

  if (Tcl_Init(interp) != TCL_OK)
    error ("Tcl_Init failed: %s", interp->result);

  if (Tk_Init(interp) != TCL_OK)
    error ("Tk_Init failed: %s", interp->result);

  Tcl_CreateCommand (interp, "gdb_cmd", call_wrapper, gdb_cmd, NULL);
  Tcl_CreateCommand (interp, "gdb_loc", call_wrapper, gdb_loc, NULL);
  Tcl_CreateCommand (interp, "gdb_sourcelines", call_wrapper, gdb_sourcelines,
		     NULL);
  Tcl_CreateCommand (interp, "gdb_listfiles", call_wrapper, gdb_listfiles,
		     NULL);
  Tcl_CreateCommand (interp, "gdb_stop", call_wrapper, gdb_stop, NULL);
  Tcl_CreateCommand (interp, "gdb_regnames", call_wrapper, gdb_regnames, NULL);
  Tcl_CreateCommand (interp, "gdb_fetch_registers", call_wrapper,
		     gdb_fetch_registers, NULL);
  Tcl_CreateCommand (interp, "gdb_changed_register_list", call_wrapper,
		     gdb_changed_register_list, NULL);

  gdbtk_filename = getenv ("GDBTK_FILENAME");
  if (!gdbtk_filename)
    if (access ("gdbtk.tcl", R_OK) == 0)
      gdbtk_filename = "gdbtk.tcl";
    else
      gdbtk_filename = GDBTK_FILENAME;

  if (Tcl_EvalFile (interp, gdbtk_filename) != TCL_OK)
    error ("Failure reading %s: %s", gdbtk_filename, interp->result);

  /* Get the file descriptor for the X server */

  x_fd = ConnectionNumber (Tk_Display (mainWindow));

  /* Setup for I/O interrupts */

  signal (SIGIO, SIG_IGN);

  i = fcntl (x_fd, F_GETFL, 0);
  fcntl (x_fd, F_SETFL, i|FASYNC);
  fcntl (x_fd, F_SETOWN, getpid()); 

  command_loop_hook = Tk_MainLoop;
  fputs_unfiltered_hook = gdbtk_fputs;
  print_frame_info_listing_hook = null_routine;
  query_hook = gdbtk_query;
  flush_hook = gdbtk_flush;
  create_breakpoint_hook = gdbtk_create_breakpoint;
  delete_breakpoint_hook = gdbtk_delete_breakpoint;
  enable_breakpoint_hook = gdbtk_enable_breakpoint;
  disable_breakpoint_hook = gdbtk_disable_breakpoint;
  interactive_hook = gdbtk_interactive;
  target_wait_hook = gdbtk_wait;
  call_command_hook = gdbtk_call_command;

  discard_cleanups (old_chain);

  add_com ("tk", class_obscure, tk_command,
	   "Send a command directly into tk.");
}

/* Come here during initialze_all_files () */

void
_initialize_gdbtk ()
{
  if (use_windows)
    {
      /* Tell the rest of the world that Gdbtk is now set up. */

      init_ui_hook = gdbtk_init;
    }
}