Use INTERNAL_FIELD for processes.

* src/process.h (PVAR): New macro.  Adjust style.
(struct Lisp_Process): Change Lisp_Object members to INTERNAL_FIELD.
* src/print.c, src/process.c, src/sysdep.c, src/w32.c:
* src/xdisp.c: Users changed.
* admin/coccinelle/process.cocci: Semantic patch to replace direct
access to Lisp_Object members of struct Lisp_Process to PVAR.

7 files changed, 293 insertions, 261 deletions

diff --git a/src/ChangeLog b/src/ChangeLog
index c82dfd6060b..e6b8051458f 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,5 +1,12 @@
 2012-08-01  Dmitry Antipov  <dmantipov@yandex.ru>
 
+        Use INTERNAL_FIELD for processes.
+        * process.h (PVAR): New macro.  Adjust style.
+        (struct Lisp_Process): Change Lisp_Object members to INTERNAL_FIELD.
+        * print.c, process.c, sysdep.c, w32.c, xdisp.c: Users changed.
+
+2012-08-01  Dmitry Antipov  <dmantipov@yandex.ru>
+
         Use INTERNAL_FIELD for windows.
         * window.h (WVAR): New macro.
         (struct window): Change Lisp_Object members to INTERNAL_FIELD.
diff --git a/src/print.c b/src/print.c
index 5effec7fd44..c4b96ff88ff 100644
--- a/src/print.c
+++ b/src/print.c
@@ -1699,11 +1699,11 @@ print_object (Lisp_Object obj, register Lisp_Object printcharfun, int escapeflag
           if (escapeflag)
             {
               strout ("#<process ", -1, -1, printcharfun);
-              print_string (XPROCESS (obj)->name, printcharfun);
+              print_string (PVAR (XPROCESS (obj), name), printcharfun);
               PRINTCHAR ('>');
             }
           else
-            print_string (XPROCESS (obj)->name, printcharfun);
+            print_string (PVAR (XPROCESS (obj), name), printcharfun);
         }
       else if (BOOL_VECTOR_P (obj))
         {
diff --git a/src/process.c b/src/process.c
index 1b66bef03a8..47f10814333 100644
--- a/src/process.c
+++ b/src/process.c
@@ -172,10 +172,10 @@ extern Lisp_Object QCfamily;
 /* QCfilter is defined in keyboard.c.  */
 extern Lisp_Object QCfilter;
 
-#define NETCONN_P(p) (EQ (XPROCESS (p)->type, Qnetwork))
-#define NETCONN1_P(p) (EQ ((p)->type, Qnetwork))
-#define SERIALCONN_P(p) (EQ (XPROCESS (p)->type, Qserial))
-#define SERIALCONN1_P(p) (EQ ((p)->type, Qserial))
+#define NETCONN_P(p) (EQ (PVAR (XPROCESS (p), type), Qnetwork))
+#define NETCONN1_P(p) (EQ (PVAR (p, type), Qnetwork))
+#define SERIALCONN_P(p) (EQ (PVAR (XPROCESS (p), type), Qserial))
+#define SERIALCONN1_P(p) (EQ (PVAR (p, type), Qserial))
 
 #ifndef HAVE_H_ERRNO
 extern int h_errno;
@@ -428,7 +428,7 @@ static void
 update_status (struct Lisp_Process *p)
 {
   eassert (p->raw_status_new);
-  p->status = status_convert (p->raw_status);
+  PVAR (p, status) = status_convert (p->raw_status);
   p->raw_status_new = 0;
 }
 
@@ -479,7 +479,7 @@ decode_status (Lisp_Object l, Lisp_Object *symbol, int *code, int *coredump)
 static Lisp_Object
 status_message (struct Lisp_Process *p)
 {
-  Lisp_Object status = p->status;
+  Lisp_Object status = PVAR (p, status);
   Lisp_Object symbol;
   int code, coredump;
   Lisp_Object string, string2;
@@ -626,8 +626,8 @@ make_process (Lisp_Object name)
   p = allocate_process ();
   /* Initialize Lisp data.  Note that allocate_process initializes all
      Lisp data to nil, so do it only for slots which should not be nil.  */
-  p->status = Qrun;
-  p->mark = Fmake_marker ();
+  PVAR (p, status) = Qrun;
+  PVAR (p, mark) = Fmake_marker ();
 
   /* Initialize non-Lisp data.  Note that allocate_process zeroes out all
      non-Lisp data, so do it only for slots which should not be zero.  */
@@ -648,7 +648,7 @@ make_process (Lisp_Object name)
       name1 = concat2 (name, make_formatted_string (suffix, "<%"pMd">", i));
     }
   name = name1;
-  p->name = name;
+  PVAR (p, name) = name;
   XSETPROCESS (val, p);
   Vprocess_alist = Fcons (Fcons (name, val), Vprocess_alist);
   return val;
@@ -745,7 +745,7 @@ nil, indicating the current buffer's process.  */)
   p->raw_status_new = 0;
   if (NETCONN1_P (p) || SERIALCONN1_P (p))
     {
-      p->status = Fcons (Qexit, Fcons (make_number (0), Qnil));
+      PVAR (p, status) = Fcons (Qexit, Fcons (make_number (0), Qnil));
       p->tick = ++process_tick;
       status_notify (p);
       redisplay_preserve_echo_area (13);
@@ -763,9 +763,9 @@ nil, indicating the current buffer's process.  */)
       /* If the process has already signaled, remove it from the list.  */
       if (p->raw_status_new)
         update_status (p);
-      symbol = p->status;
-      if (CONSP (p->status))
-        symbol = XCAR (p->status);
+      symbol = PVAR (p, status);
+      if (CONSP (PVAR (p, status)))
+        symbol = XCAR (PVAR (p, status));
       if (EQ (symbol, Qsignal) || EQ (symbol, Qexit))
         deleted_pid_list
           = Fdelete (make_fixnum_or_float (pid), deleted_pid_list);
@@ -774,7 +774,7 @@ nil, indicating the current buffer's process.  */)
         {
           Fkill_process (process, Qnil);
           /* Do this now, since remove_process will make sigchld_handler do nothing.  */
-          p->status
+          PVAR (p, status)
             = Fcons (Qsignal, Fcons (make_number (SIGKILL), Qnil));
           p->tick = ++process_tick;
           status_notify (p);
@@ -816,14 +816,14 @@ nil, indicating the current buffer's process.  */)
   p = XPROCESS (process);
   if (p->raw_status_new)
     update_status (p);
-  status = p->status;
+  status = PVAR (p, status);
   if (CONSP (status))
     status = XCAR (status);
   if (NETCONN1_P (p) || SERIALCONN1_P (p))
     {
       if (EQ (status, Qexit))
         status = Qclosed;
-      else if (EQ (p->command, Qt))
+      else if (EQ (PVAR (p, command), Qt))
         status = Qstop;
       else if (EQ (status, Qrun))
         status = Qopen;
@@ -840,8 +840,8 @@ If PROCESS has not yet exited or died, return 0.  */)
   CHECK_PROCESS (process);
   if (XPROCESS (process)->raw_status_new)
     update_status (XPROCESS (process));
-  if (CONSP (XPROCESS (process)->status))
-    return XCAR (XCDR (XPROCESS (process)->status));
+  if (CONSP (PVAR (XPROCESS (process), status)))
+    return XCAR (XCDR (PVAR (XPROCESS (process), status)));
   return make_number (0);
 }
 
@@ -865,7 +865,7 @@ possibly modified to make it unique among process names.  */)
   (register Lisp_Object process)
 {
   CHECK_PROCESS (process);
-  return XPROCESS (process)->name;
+  return PVAR (XPROCESS (process), name);
 }
 
 DEFUN ("process-command", Fprocess_command, Sprocess_command, 1, 1, 0,
@@ -877,7 +877,7 @@ For a network or serial process, this is nil (process is running) or t
   (register Lisp_Object process)
 {
   CHECK_PROCESS (process);
-  return XPROCESS (process)->command;
+  return PVAR (XPROCESS (process), command);
 }
 
 DEFUN ("process-tty-name", Fprocess_tty_name, Sprocess_tty_name, 1, 1, 0,
@@ -887,7 +887,7 @@ not the name of the pty that Emacs uses to talk with that terminal.  */)
   (register Lisp_Object process)
 {
   CHECK_PROCESS (process);
-  return XPROCESS (process)->tty_name;
+  return PVAR (XPROCESS (process), tty_name);
 }
 
 DEFUN ("set-process-buffer", Fset_process_buffer, Sset_process_buffer,
@@ -902,9 +902,9 @@ Return BUFFER.  */)
   if (!NILP (buffer))
     CHECK_BUFFER (buffer);
   p = XPROCESS (process);
-  p->buffer = buffer;
+  PVAR (p, buffer) = buffer;
   if (NETCONN1_P (p) || SERIALCONN1_P (p))
-    p->childp = Fplist_put (p->childp, QCbuffer, buffer);
+    PVAR (p, childp) = Fplist_put (PVAR (p, childp), QCbuffer, buffer);
   setup_process_coding_systems (process);
   return buffer;
 }
@@ -916,7 +916,7 @@ Output from PROCESS is inserted in this buffer unless PROCESS has a filter.  */)
   (register Lisp_Object process)
 {
   CHECK_PROCESS (process);
-  return XPROCESS (process)->buffer;
+  return PVAR (XPROCESS (process), buffer);
 }
 
 DEFUN ("process-mark", Fprocess_mark, Sprocess_mark,
@@ -925,7 +925,7 @@ DEFUN ("process-mark", Fprocess_mark, Sprocess_mark,
   (register Lisp_Object process)
 {
   CHECK_PROCESS (process);
-  return XPROCESS (process)->mark;
+  return PVAR (XPROCESS (process), mark);
 }
 
 DEFUN ("set-process-filter", Fset_process_filter, Sset_process_filter,
@@ -961,23 +961,23 @@ The string argument is normally a multibyte string, except:
 
   if (p->infd >= 0)
     {
-      if (EQ (filter, Qt) && !EQ (p->status, Qlisten))
+      if (EQ (filter, Qt) && !EQ (PVAR (p, status), Qlisten))
         {
           FD_CLR (p->infd, &input_wait_mask);
           FD_CLR (p->infd, &non_keyboard_wait_mask);
         }
-      else if (EQ (p->filter, Qt)
+      else if (EQ (PVAR (p, filter), Qt)
                /* Network or serial process not stopped:  */
-               && !EQ (p->command, Qt))
+               && !EQ (PVAR (p, command), Qt))
         {
           FD_SET (p->infd, &input_wait_mask);
           FD_SET (p->infd, &non_keyboard_wait_mask);
         }
     }
 
-  p->filter = filter;
+  PVAR (p, filter) = filter;
   if (NETCONN1_P (p) || SERIALCONN1_P (p))
-    p->childp = Fplist_put (p->childp, QCfilter, filter);
+    PVAR (p, childp) = Fplist_put (PVAR (p, childp), QCfilter, filter);
   setup_process_coding_systems (process);
   return filter;
 }
@@ -989,7 +989,7 @@ See `set-process-filter' for more info on filter functions.  */)
   (register Lisp_Object process)
 {
   CHECK_PROCESS (process);
-  return XPROCESS (process)->filter;
+  return PVAR (XPROCESS (process), filter);
 }
 
 DEFUN ("set-process-sentinel", Fset_process_sentinel, Sset_process_sentinel,
@@ -1004,9 +1004,9 @@ It gets two arguments: the process, and a string describing the change.  */)
   CHECK_PROCESS (process);
   p = XPROCESS (process);
 
-  p->sentinel = sentinel;
+  PVAR (p, sentinel) = sentinel;
   if (NETCONN1_P (p) || SERIALCONN1_P (p))
-    p->childp = Fplist_put (p->childp, QCsentinel, sentinel);
+    PVAR (p, childp) = Fplist_put (PVAR (p, childp), QCsentinel, sentinel);
   return sentinel;
 }
 
@@ -1017,7 +1017,7 @@ See `set-process-sentinel' for more info on sentinels.  */)
   (register Lisp_Object process)
 {
   CHECK_PROCESS (process);
-  return XPROCESS (process)->sentinel;
+  return PVAR (XPROCESS (process), sentinel);
 }
 
 DEFUN ("set-process-window-size", Fset_process_window_size,
@@ -1102,7 +1102,7 @@ list of keywords.  */)
   Lisp_Object contact;
 
   CHECK_PROCESS (process);
-  contact = XPROCESS (process)->childp;
+  contact = PVAR (XPROCESS (process), childp);
 
 #ifdef DATAGRAM_SOCKETS
   if (DATAGRAM_CONN_P (process)
@@ -1128,7 +1128,7 @@ DEFUN ("process-plist", Fprocess_plist, Sprocess_plist,
   (register Lisp_Object process)
 {
   CHECK_PROCESS (process);
-  return XPROCESS (process)->plist;
+  return PVAR (XPROCESS (process), plist);
 }
 
 DEFUN ("set-process-plist", Fset_process_plist, Sset_process_plist,
@@ -1139,7 +1139,7 @@ DEFUN ("set-process-plist", Fset_process_plist, Sset_process_plist,
   CHECK_PROCESS (process);
   CHECK_LIST (plist);
 
-  XPROCESS (process)->plist = plist;
+  PVAR (XPROCESS (process), plist) = plist;
   return plist;
 }
 
@@ -1151,7 +1151,7 @@ The value is nil for a pipe, t or `pty' for a pty, or `stream' for
 a socket connection.  */)
   (Lisp_Object process)
 {
-  return XPROCESS (process)->type;
+  return PVAR (XPROCESS (process), type);
 }
 #endif
 
@@ -1164,7 +1164,7 @@ nil, indicating the current buffer's process.  */)
 {
   Lisp_Object proc;
   proc = get_process (process);
-  return XPROCESS (proc)->type;
+  return PVAR (XPROCESS (proc), type);
 }
 
 DEFUN ("format-network-address", Fformat_network_address, Sformat_network_address,
@@ -1325,13 +1325,13 @@ usage: (start-process NAME BUFFER PROGRAM &rest PROGRAM-ARGS)  */)
      itself; it's all taken care of here.  */
   record_unwind_protect (start_process_unwind, proc);
 
-  XPROCESS (proc)->childp = Qt;
-  XPROCESS (proc)->plist = Qnil;
-  XPROCESS (proc)->type = Qreal;
-  XPROCESS (proc)->buffer = buffer;
-  XPROCESS (proc)->sentinel = Qnil;
-  XPROCESS (proc)->filter = Qnil;
-  XPROCESS (proc)->command = Flist (nargs - 2, args + 2);
+  PVAR (XPROCESS (proc), childp) = Qt;
+  PVAR (XPROCESS (proc), plist) = Qnil;
+  PVAR (XPROCESS (proc), type) = Qreal;
+  PVAR (XPROCESS (proc), buffer) = buffer;
+  PVAR (XPROCESS (proc), sentinel) = Qnil;
+  PVAR (XPROCESS (proc), filter) = Qnil;
+  PVAR (XPROCESS (proc), command) = Flist (nargs - 2, args + 2);
 
 #ifdef HAVE_GNUTLS
   /* AKA GNUTLS_INITSTAGE(proc).  */
@@ -1347,7 +1347,7 @@ usage: (start-process NAME BUFFER PROGRAM &rest PROGRAM-ARGS)  */)
 
   /* Make the process marker point into the process buffer (if any).  */
   if (BUFFERP (buffer))
-    set_marker_both (XPROCESS (proc)->mark, buffer,
+    set_marker_both (PVAR (XPROCESS (proc), mark), buffer,
                      BUF_ZV (XBUFFER (buffer)),
                      BUF_ZV_BYTE (XBUFFER (buffer)));
 
@@ -1376,7 +1376,7 @@ usage: (start-process NAME BUFFER PROGRAM &rest PROGRAM-ARGS)  */)
         else if (CONSP (Vdefault_process_coding_system))
           val = XCAR (Vdefault_process_coding_system);
       }
-    XPROCESS (proc)->decode_coding_system = val;
+    PVAR (XPROCESS (proc), decode_coding_system) = val;
 
     val = Vcoding_system_for_write;
     if (NILP (val))
@@ -1396,7 +1396,7 @@ usage: (start-process NAME BUFFER PROGRAM &rest PROGRAM-ARGS)  */)
         else if (CONSP (Vdefault_process_coding_system))
           val = XCDR (Vdefault_process_coding_system);
       }
-    XPROCESS (proc)->encode_coding_system = val;
+    PVAR (XPROCESS (proc), encode_coding_system) = val;
     /* Note: At this moment, the above coding system may leave
        text-conversion or eol-conversion unspecified.  They will be
        decided after we read output from the process and decode it by
@@ -1405,9 +1405,9 @@ usage: (start-process NAME BUFFER PROGRAM &rest PROGRAM-ARGS)  */)
   }
 
 
-  XPROCESS (proc)->decoding_buf = empty_unibyte_string;
+  PVAR (XPROCESS (proc), decoding_buf) = empty_unibyte_string;
   XPROCESS (proc)->decoding_carryover = 0;
-  XPROCESS (proc)->encoding_buf = empty_unibyte_string;
+  PVAR (XPROCESS (proc), encoding_buf) = empty_unibyte_string;
 
   XPROCESS (proc)->inherit_coding_system_flag
     = !(NILP (buffer) || !inherit_process_coding_system);
@@ -1465,7 +1465,7 @@ usage: (start-process NAME BUFFER PROGRAM &rest PROGRAM-ARGS)  */)
               {
                 if (NILP (arg_encoding))
                   arg_encoding = (complement_process_encoding_system
-                                  (XPROCESS (proc)->encode_coding_system));
+                                  (PVAR (XPROCESS (proc), encode_coding_system)));
                 XSETCAR (tem,
                          code_convert_string_norecord
                          (XCAR (tem), arg_encoding, 1));
@@ -1629,7 +1629,7 @@ create_process (Lisp_Object process, char **new_argv, Lisp_Object current_dir)
      more portable (see USG_SUBTTY_WORKS above).  */
 
   XPROCESS (process)->pty_flag = pty_flag;
-  XPROCESS (process)->status = Qrun;
+  PVAR (XPROCESS (process), status) = Qrun;
 
   /* Delay interrupts until we have a chance to store
      the new fork's pid in its process structure */
@@ -1868,10 +1868,10 @@ create_process (Lisp_Object process, char **new_argv, Lisp_Object current_dir)
 
 #ifdef HAVE_PTYS
       if (pty_flag)
-        XPROCESS (process)->tty_name = build_string (pty_name);
+        PVAR (XPROCESS (process), tty_name) = build_string (pty_name);
       else
 #endif
-        XPROCESS (process)->tty_name = Qnil;
+        PVAR (XPROCESS (process), tty_name) = Qnil;
 
 #if !defined (WINDOWSNT) && defined (FD_CLOEXEC)
       /* Wait for child_setup to complete in case that vfork is
@@ -1966,7 +1966,7 @@ create_pty (Lisp_Object process)
      more portable (see USG_SUBTTY_WORKS above).  */
 
   XPROCESS (process)->pty_flag = pty_flag;
-  XPROCESS (process)->status = Qrun;
+  PVAR (XPROCESS (process), status) = Qrun;
   setup_process_coding_systems (process);
 
   FD_SET (inchannel, &input_wait_mask);
@@ -1977,10 +1977,10 @@ create_pty (Lisp_Object process)
   XPROCESS (process)->pid = -2;
 #ifdef HAVE_PTYS
   if (pty_flag)
-    XPROCESS (process)->tty_name = build_string (pty_name);
+    PVAR (XPROCESS (process), tty_name) = build_string (pty_name);
   else
 #endif
-    XPROCESS (process)->tty_name = Qnil;
+    PVAR (XPROCESS (process), tty_name) = Qnil;
 }
 
 
@@ -2369,7 +2369,7 @@ OPTION is not a supported option, return nil instead; otherwise return t.  */)
 
   if (set_socket_option (s, option, value))
     {
-      p->childp = Fplist_put (p->childp, option, value);
+      PVAR (p, childp) = Fplist_put (PVAR (p, childp), option, value);
       return Qt;
     }
 
@@ -2458,10 +2458,10 @@ usage: (serial-process-configure &rest ARGS)  */)
     proc = Fplist_get (contact, QCport);
   proc = get_process (proc);
   p = XPROCESS (proc);
-  if (!EQ (p->type, Qserial))
+  if (!EQ (PVAR (p, type), Qserial))
     error ("Not a serial process");
 
-  if (NILP (Fplist_get (p->childp, QCspeed)))
+  if (NILP (Fplist_get (PVAR (p, childp), QCspeed)))
     {
       UNGCPRO;
       return Qnil;
@@ -2602,21 +2602,21 @@ usage:  (make-serial-process &rest ARGS)  */)
   if (NILP (buffer))
     buffer = name;
   buffer = Fget_buffer_create (buffer);
-  p->buffer = buffer;
-
-  p->childp = contact;
-  p->plist = Fcopy_sequence (Fplist_get (contact, QCplist));
-  p->type = Qserial;
-  p->sentinel = Fplist_get (contact, QCsentinel);
-  p->filter = Fplist_get (contact, QCfilter);
-  p->log = Qnil;
+  PVAR (p, buffer) = buffer;
+
+  PVAR (p, childp) = contact;
+  PVAR (p, plist) = Fcopy_sequence (Fplist_get (contact, QCplist));
+  PVAR (p, type) = Qserial;
+  PVAR (p, sentinel) = Fplist_get (contact, QCsentinel);
+  PVAR (p, filter) = Fplist_get (contact, QCfilter);
+  PVAR (p, log) = Qnil;
   if (tem = Fplist_get (contact, QCnoquery), !NILP (tem))
     p->kill_without_query = 1;
   if (tem = Fplist_get (contact, QCstop), !NILP (tem))
-    p->command = Qt;
+    PVAR (p, command) = Qt;
   p->pty_flag = 0;
 
-  if (!EQ (p->command, Qt))
+  if (!EQ (PVAR (p, command), Qt))
     {
       FD_SET (fd, &input_wait_mask);
       FD_SET (fd, &non_keyboard_wait_mask);
@@ -2624,7 +2624,7 @@ usage:  (make-serial-process &rest ARGS)  */)
 
   if (BUFFERP (buffer))
     {
-      set_marker_both (p->mark, buffer,
+      set_marker_both (PVAR (p, mark), buffer,
                        BUF_ZV (XBUFFER (buffer)),
                        BUF_ZV_BYTE (XBUFFER (buffer)));
     }
@@ -2645,7 +2645,7 @@ usage:  (make-serial-process &rest ARGS)  */)
   else if ((!NILP (buffer) && NILP (BVAR (XBUFFER (buffer), enable_multibyte_characters)))
            || (NILP (buffer) && NILP (BVAR (&buffer_defaults, enable_multibyte_characters))))
     val = Qnil;
-  p->decode_coding_system = val;
+  PVAR (p, decode_coding_system) = val;
 
   val = Qnil;
   if (!NILP (tem))
@@ -2659,12 +2659,12 @@ usage:  (make-serial-process &rest ARGS)  */)
   else if ((!NILP (buffer) && NILP (BVAR (XBUFFER (buffer), enable_multibyte_characters)))
            || (NILP (buffer) && NILP (BVAR (&buffer_defaults, enable_multibyte_characters))))
     val = Qnil;
-  p->encode_coding_system = val;
+  PVAR (p, encode_coding_system) = val;
 
   setup_process_coding_systems (proc);
-  p->decoding_buf = empty_unibyte_string;
+  PVAR (p, decoding_buf) = empty_unibyte_string;
   p->decoding_carryover = 0;
-  p->encoding_buf = empty_unibyte_string;
+  PVAR (p, encoding_buf) = empty_unibyte_string;
   p->inherit_coding_system_flag
     = !(!NILP (tem) || NILP (buffer) || !inherit_process_coding_system);
 
@@ -3401,27 +3401,27 @@ usage: (make-network-process &rest ARGS)  */)
 
   p = XPROCESS (proc);
 
-  p->childp = contact;
-  p->plist = Fcopy_sequence (Fplist_get (contact, QCplist));
-  p->type = Qnetwork;
+  PVAR (p, childp) = contact;
+  PVAR (p, plist) = Fcopy_sequence (Fplist_get (contact, QCplist));
+  PVAR (p, type) = Qnetwork;
 
-  p->buffer = buffer;
-  p->sentinel = sentinel;
-  p->filter = filter;
-  p->log = Fplist_get (contact, QClog);
+  PVAR (p, buffer) = buffer;
+  PVAR (p, sentinel) = sentinel;
+  PVAR (p, filter) = filter;
+  PVAR (p, log) = Fplist_get (contact, QClog);
   if (tem = Fplist_get (contact, QCnoquery), !NILP (tem))
     p->kill_without_query = 1;
   if ((tem = Fplist_get (contact, QCstop), !NILP (tem)))
-    p->command = Qt;
+    PVAR (p, command) = Qt;
   p->pid = 0;
   p->infd  = inch;
   p->outfd = outch;
   if (is_server && socktype != SOCK_DGRAM)
-    p->status = Qlisten;
+    PVAR (p, status) = Qlisten;
 
   /* Make the process marker point into the process buffer (if any).  */
   if (BUFFERP (buffer))
-    set_marker_both (p->mark, buffer,
+    set_marker_both (PVAR (p, mark), buffer,
                      BUF_ZV (XBUFFER (buffer)),
                      BUF_ZV_BYTE (XBUFFER (buffer)));
 
@@ -3431,7 +3431,7 @@ usage: (make-network-process &rest ARGS)  */)
       /* We may get here if connect did succeed immediately.  However,
          in that case, we still need to signal this like a non-blocking
          connection.  */
-      p->status = Qconnect;
+      PVAR (p, status) = Qconnect;
       if (!FD_ISSET (inch, &connect_wait_mask))
         {
           FD_SET (inch, &connect_wait_mask);
@@ -3443,8 +3443,8 @@ usage: (make-network-process &rest ARGS)  */)
 #endif
     /* A server may have a client filter setting of Qt, but it must
        still listen for incoming connects unless it is stopped.  */
-    if ((!EQ (p->filter, Qt) && !EQ (p->command, Qt))
-        || (EQ (p->status, Qlisten) && NILP (p->command)))
+    if ((!EQ (PVAR (p, filter), Qt) && !EQ (PVAR (p, command), Qt))
+        || (EQ (PVAR (p, status), Qlisten) && NILP (PVAR (p, command))))
       {
         FD_SET (inch, &input_wait_mask);
         FD_SET (inch, &non_keyboard_wait_mask);
@@ -3498,7 +3498,7 @@ usage: (make-network-process &rest ARGS)  */)
         else
           val = Qnil;
       }
-    p->decode_coding_system = val;
+    PVAR (p, decode_coding_system) = val;
 
     if (!NILP (tem))
       {
@@ -3532,13 +3532,13 @@ usage: (make-network-process &rest ARGS)  */)
         else
           val = Qnil;
       }
-    p->encode_coding_system = val;
+    PVAR (p, encode_coding_system) = val;
   }
   setup_process_coding_systems (proc);
 
-  p->decoding_buf = empty_unibyte_string;
+  PVAR (p, decoding_buf) = empty_unibyte_string;
   p->decoding_carryover = 0;
-  p->encoding_buf = empty_unibyte_string;
+  PVAR (p, encoding_buf) = empty_unibyte_string;
 
   p->inherit_coding_system_flag
     = !(!NILP (tem) || NILP (buffer) || !inherit_process_coding_system);
@@ -4031,8 +4031,8 @@ server_accept_connection (Lisp_Object server, int channel)
         return;
 #endif
 
-      if (!NILP (ps->log))
-        call3 (ps->log, server, Qnil,
+      if (!NILP (PVAR (ps, log)))
+        call3 (PVAR (ps, log), server, Qnil,
                concat3 (build_string ("accept failed with code"),
                         Fnumber_to_string (make_number (code)),
                         build_string ("\n")));
@@ -4102,15 +4102,15 @@ server_accept_connection (Lisp_Object server, int channel)
      process name of the server process concatenated with the caller
      identification.  */
 
-  if (!NILP (ps->filter) && !EQ (ps->filter, Qt))
+  if (!NILP (PVAR (ps, filter)) && !EQ (PVAR (ps, filter), Qt))
     buffer = Qnil;
   else
     {
-      buffer = ps->buffer;
+      buffer = PVAR (ps, buffer);
       if (!NILP (buffer))
         buffer = Fbuffer_name (buffer);
       else
-        buffer = ps->name;
+        buffer = PVAR (ps, name);
       if (!NILP (buffer))
         {
           buffer = concat2 (buffer, caller);
@@ -4121,7 +4121,7 @@ server_accept_connection (Lisp_Object server, int channel)
   /* Generate a unique name for the new server process.  Combine the
      server process name with the caller identification.  */
 
-  name = concat2 (ps->name, caller);
+  name = concat2 (PVAR (ps, name), caller);
   proc = make_process (name);
 
   chan_process[s] = proc;
@@ -4137,7 +4137,7 @@ server_accept_connection (Lisp_Object server, int channel)
   p = XPROCESS (proc);
 
   /* Build new contact information for this setup.  */
-  contact = Fcopy_sequence (ps->childp);
+  contact = Fcopy_sequence (PVAR (ps, childp));
   contact = Fplist_put (contact, QCserver, Qnil);
   contact = Fplist_put (contact, QChost, host);
   if (!NILP (service))
@@ -4151,21 +4151,21 @@ server_accept_connection (Lisp_Object server, int channel)
                           conv_sockaddr_to_lisp (&saddr.sa, len));
 #endif
 
-  p->childp = contact;
-  p->plist = Fcopy_sequence (ps->plist);
-  p->type = Qnetwork;
+  PVAR (p, childp) = contact;
+  PVAR (p, plist) = Fcopy_sequence (PVAR (ps, plist));
+  PVAR (p, type) = Qnetwork;
 
-  p->buffer = buffer;
-  p->sentinel = ps->sentinel;
-  p->filter = ps->filter;
-  p->command = Qnil;
+  PVAR (p, buffer) = buffer;
+  PVAR (p, sentinel) = PVAR (ps, sentinel);
+  PVAR (p, filter) = PVAR (ps, filter);
+  PVAR (p, command) = Qnil;
   p->pid = 0;
   p->infd  = s;
   p->outfd = s;
-  p->status = Qrun;
+  PVAR (p, status) = Qrun;
 
   /* Client processes for accepted connections are not stopped initially.  */
-  if (!EQ (p->filter, Qt))
+  if (!EQ (PVAR (p, filter), Qt))
     {
       FD_SET (s, &input_wait_mask);
       FD_SET (s, &non_keyboard_wait_mask);
@@ -4179,24 +4179,24 @@ server_accept_connection (Lisp_Object server, int channel)
      of the new process should reflect the settings at the time the
      server socket was opened; not the current settings. */
 
-  p->decode_coding_system = ps->decode_coding_system;
-  p->encode_coding_system = ps->encode_coding_system;
+  PVAR (p, decode_coding_system) = PVAR (ps, decode_coding_system);
+  PVAR (p, encode_coding_system) = PVAR (ps, encode_coding_system);
   setup_process_coding_systems (proc);
 
-  p->decoding_buf = empty_unibyte_string;
+  PVAR (p, decoding_buf) = empty_unibyte_string;
   p->decoding_carryover = 0;
-  p->encoding_buf = empty_unibyte_string;
+  PVAR (p, encoding_buf) = empty_unibyte_string;
 
   p->inherit_coding_system_flag
     = (NILP (buffer) ? 0 : ps->inherit_coding_system_flag);
 
-  if (!NILP (ps->log))
-      call3 (ps->log, server, proc,
+  if (!NILP (PVAR (ps, log)))
+      call3 (PVAR (ps, log), server, proc,
              concat3 (build_string ("accept from "),
                       (STRINGP (host) ? host : build_string ("-")),
                       build_string ("\n")));
 
-  if (!NILP (p->sentinel))
+  if (!NILP (PVAR (p, sentinel)))
     exec_sentinel (proc,
                    concat3 (build_string ("open from "),
                             (STRINGP (host) ? host : build_string ("-")),
@@ -4287,7 +4287,8 @@ wait_reading_process_output (intmax_t time_limit, int nsecs, int read_kbd,
   FD_ZERO (&Writeok);
 
   if (time_limit == 0 && nsecs == 0 && wait_proc && !NILP (Vinhibit_quit)
-      && !(CONSP (wait_proc->status) && EQ (XCAR (wait_proc->status), Qexit)))
+      && !(CONSP (PVAR (wait_proc, status)) 
+           && EQ (XCAR (PVAR (wait_proc, status)), Qexit)))
     message ("Blocking call to accept-process-output with quit inhibited!!");
 
   /* If wait_proc is a process to watch, set wait_channel accordingly.  */
@@ -4460,8 +4461,8 @@ wait_reading_process_output (intmax_t time_limit, int nsecs, int read_kbd,
       if (wait_proc && wait_proc->raw_status_new)
         update_status (wait_proc);
       if (wait_proc
-          && ! EQ (wait_proc->status, Qrun)
-          && ! EQ (wait_proc->status, Qconnect))
+          && ! EQ (PVAR (wait_proc, status), Qrun)
+          && ! EQ (PVAR (wait_proc, status), Qconnect))
         {
           int nread, total_nread = 0;
 
@@ -4820,7 +4821,7 @@ wait_reading_process_output (intmax_t time_limit, int nsecs, int read_kbd,
                 continue;
 
               /* If this is a server stream socket, accept connection.  */
-              if (EQ (XPROCESS (proc)->status, Qlisten))
+              if (EQ (PVAR (XPROCESS (proc), status), Qlisten))
                 {
                   server_accept_connection (proc, channel);
                   continue;
@@ -4889,7 +4890,7 @@ wait_reading_process_output (intmax_t time_limit, int nsecs, int read_kbd,
                          wait3() will not find the process object to
                          delete.  Do it here.  */
                       p->tick = ++process_tick;
-                      p->status = Qfailed;
+                      PVAR (p, status) = Qfailed;
                     }
                   else
                     kill (getpid (), SIGCHLD);
@@ -4908,8 +4909,8 @@ wait_reading_process_output (intmax_t time_limit, int nsecs, int read_kbd,
                   deactivate_process (proc);
                   if (XPROCESS (proc)->raw_status_new)
                     update_status (XPROCESS (proc));
-                  if (EQ (XPROCESS (proc)->status, Qrun))
-                    XPROCESS (proc)->status
+                  if (EQ (PVAR (XPROCESS (proc), status), Qrun))
+                    PVAR (XPROCESS (proc), status)
                       = Fcons (Qexit, Fcons (make_number (256), Qnil));
                 }
             }
@@ -4958,17 +4959,18 @@ wait_reading_process_output (intmax_t time_limit, int nsecs, int read_kbd,
               if (xerrno)
                 {
                   p->tick = ++process_tick;
-                  p->status = Fcons (Qfailed, Fcons (make_number (xerrno), Qnil));
+                  PVAR (p, status) 
+                    = Fcons (Qfailed, Fcons (make_number (xerrno), Qnil));
                   deactivate_process (proc);
                 }
               else
                 {
-                  p->status = Qrun;
+                  PVAR (p, status) = Qrun;
                   /* Execute the sentinel here.  If we had relied on
                      status_notify to do it later, it will read input
                      from the process before calling the sentinel.  */
                   exec_sentinel (proc, build_string ("open\n"));
-                  if (!EQ (p->filter, Qt) && !EQ (p->command, Qt))
+                  if (!EQ (PVAR (p, filter), Qt) && !EQ (PVAR (p, command), Qt))
                     {
                       FD_SET (p->infd, &input_wait_mask);
                       FD_SET (p->infd, &non_keyboard_wait_mask);
@@ -5040,7 +5042,7 @@ read_process_output (Lisp_Object proc, register int channel)
   chars = alloca (carryover + readmax);
   if (carryover)
     /* See the comment above.  */
-    memcpy (chars, SDATA (p->decoding_buf), carryover);
+    memcpy (chars, SDATA (PVAR (p, decoding_buf)), carryover);
 
 #ifdef DATAGRAM_SOCKETS
   /* We have a working select, so proc_buffered_char is always -1.  */
@@ -5119,7 +5121,7 @@ read_process_output (Lisp_Object proc, register int channel)
   record_unwind_protect (set_buffer_if_live, Fcurrent_buffer ());
 
   /* Read and dispose of the process output.  */
-  outstream = p->filter;
+  outstream = PVAR (p, filter);
   if (!NILP (outstream))
     {
       Lisp_Object text;
@@ -5161,9 +5163,9 @@ read_process_output (Lisp_Object proc, register int channel)
       text = coding->dst_object;
       Vlast_coding_system_used = CODING_ID_NAME (coding->id);
       /* A new coding system might be found.  */
-      if (!EQ (p->decode_coding_system, Vlast_coding_system_used))
+      if (!EQ (PVAR (p, decode_coding_system), Vlast_coding_system_used))
         {
-          p->decode_coding_system = Vlast_coding_system_used;
+          PVAR (p, decode_coding_system) = Vlast_coding_system_used;
 
           /* Don't call setup_coding_system for
              proc_decode_coding_system[channel] here.  It is done in
@@ -5176,21 +5178,21 @@ read_process_output (Lisp_Object proc, register int channel)
              proc_encode_coding_system[p->outfd] surely points to a
              valid memory because p->outfd will be changed once EOF is
              sent to the process.  */
-          if (NILP (p->encode_coding_system)
+          if (NILP (PVAR (p, encode_coding_system))
               && proc_encode_coding_system[p->outfd])
             {
-              p->encode_coding_system
+              PVAR (p, encode_coding_system)
                 = coding_inherit_eol_type (Vlast_coding_system_used, Qnil);
-              setup_coding_system (p->encode_coding_system,
+              setup_coding_system (PVAR (p, encode_coding_system),
                                    proc_encode_coding_system[p->outfd]);
             }
         }
 
       if (coding->carryover_bytes > 0)
         {
-          if (SCHARS (p->decoding_buf) < coding->carryover_bytes)
-            p->decoding_buf = make_uninit_string (coding->carryover_bytes);
-          memcpy (SDATA (p->decoding_buf), coding->carryover,
+          if (SCHARS (PVAR (p, decoding_buf)) < coding->carryover_bytes)
+            PVAR (p, decoding_buf) = make_uninit_string (coding->carryover_bytes);
+          memcpy (SDATA (PVAR (p, decoding_buf)), coding->carryover,
                   coding->carryover_bytes);
           p->decoding_carryover = coding->carryover_bytes;
         }
@@ -5226,7 +5228,7 @@ read_process_output (Lisp_Object proc, register int channel)
     }
 
   /* If no filter, write into buffer if it isn't dead.  */
-  else if (!NILP (p->buffer) && !NILP (BVAR (XBUFFER (p->buffer), name)))
+  else if (!NILP (PVAR (p, buffer)) && !NILP (BVAR (XBUFFER (PVAR (p, buffer)), name)))
     {
       Lisp_Object old_read_only;
       ptrdiff_t old_begv, old_zv;
@@ -5236,7 +5238,7 @@ read_process_output (Lisp_Object proc, register int channel)
       Lisp_Object text;
       struct buffer *b;
 
-      Fset_buffer (p->buffer);
+      Fset_buffer (PVAR (p, buffer));
       opoint = PT;
       opoint_byte = PT_BYTE;
       old_read_only = BVAR (current_buffer, read_only);
@@ -5250,9 +5252,11 @@ read_process_output (Lisp_Object proc, register int channel)
       /* Insert new output into buffer
          at the current end-of-output marker,
          thus preserving logical ordering of input and output.  */
-      if (XMARKER (p->mark)->buffer)
-        SET_PT_BOTH (clip_to_bounds (BEGV, marker_position (p->mark), ZV),
-                     clip_to_bounds (BEGV_BYTE, marker_byte_position (p->mark),
+      if (XMARKER (PVAR (p, mark))->buffer)
+        SET_PT_BOTH (clip_to_bounds (BEGV,
+                                     marker_position (PVAR (p, mark)), ZV),
+                     clip_to_bounds (BEGV_BYTE,
+                                     marker_byte_position (PVAR (p, mark)),
                                      ZV_BYTE));
       else
         SET_PT_BOTH (ZV, ZV_BYTE);
@@ -5269,23 +5273,23 @@ read_process_output (Lisp_Object proc, register int channel)
       Vlast_coding_system_used = CODING_ID_NAME (coding->id);
       /* A new coding system might be found.  See the comment in the
          similar code in the previous `if' block.  */
-      if (!EQ (p->decode_coding_system, Vlast_coding_system_used))
+      if (!EQ (PVAR (p, decode_coding_system), Vlast_coding_system_used))
         {
-          p->decode_coding_system = Vlast_coding_system_used;
-          if (NILP (p->encode_coding_system)
+          PVAR (p, decode_coding_system) = Vlast_coding_system_used;
+          if (NILP (PVAR (p, encode_coding_system))
               && proc_encode_coding_system[p->outfd])
             {
-              p->encode_coding_system
+              PVAR (p, encode_coding_system)
                 = coding_inherit_eol_type (Vlast_coding_system_used, Qnil);
-              setup_coding_system (p->encode_coding_system,
+              setup_coding_system (PVAR (p, encode_coding_system),
                                    proc_encode_coding_system[p->outfd]);
             }
         }
       if (coding->carryover_bytes > 0)
         {
-          if (SCHARS (p->decoding_buf) < coding->carryover_bytes)
-            p->decoding_buf = make_uninit_string (coding->carryover_bytes);
-          memcpy (SDATA (p->decoding_buf), coding->carryover,
+          if (SCHARS (PVAR (p, decoding_buf)) < coding->carryover_bytes)
+            PVAR (p, decoding_buf) = make_uninit_string (coding->carryover_bytes);
+          memcpy (SDATA (PVAR (p, decoding_buf)), coding->carryover,
                   coding->carryover_bytes);
           p->decoding_carryover = coding->carryover_bytes;
         }
@@ -5303,11 +5307,11 @@ read_process_output (Lisp_Object proc, register int channel)
       /* Make sure the process marker's position is valid when the
          process buffer is changed in the signal_after_change above.
          W3 is known to do that.  */
-      if (BUFFERP (p->buffer)
-          && (b = XBUFFER (p->buffer), b != current_buffer))
-        set_marker_both (p->mark, p->buffer, BUF_PT (b), BUF_PT_BYTE (b));
+      if (BUFFERP (PVAR (p, buffer))
+          && (b = XBUFFER (PVAR (p, buffer)), b != current_buffer))
+        set_marker_both (PVAR (p, mark), PVAR (p, buffer), BUF_PT (b), BUF_PT_BYTE (b));
       else
-        set_marker_both (p->mark, p->buffer, PT, PT_BYTE);
+        set_marker_both (PVAR (p, mark), PVAR (p, buffer), PT, PT_BYTE);
 
       update_mode_lines++;
 
@@ -5401,9 +5405,9 @@ write_queue_push (struct Lisp_Process *p, Lisp_Object input_obj,
   entry = Fcons (obj, Fcons (make_number (offset), make_number (len)));
 
   if (front)
-    p->write_queue = Fcons (entry, p->write_queue);
+    PVAR (p, write_queue) = Fcons (entry, PVAR (p, write_queue));
   else
-    p->write_queue = nconc2 (p->write_queue, Fcons (entry, Qnil));
+    PVAR (p, write_queue) = nconc2 (PVAR (p, write_queue), Fcons (entry, Qnil));
 }
 
 /* Remove the first element in the write_queue of process P, put its
@@ -5417,11 +5421,11 @@ write_queue_pop (struct Lisp_Process *p, Lisp_Object *obj,
   Lisp_Object entry, offset_length;
   ptrdiff_t offset;
 
-  if (NILP (p->write_queue))
+  if (NILP (PVAR (p, write_queue)))
     return 0;
 
-  entry = XCAR (p->write_queue);
-  p->write_queue = XCDR (p->write_queue);
+  entry = XCAR (PVAR (p, write_queue));
+  PVAR (p, write_queue) = XCDR (PVAR (p, write_queue));
 
   *obj = XCAR (entry);
   offset_length = XCDR (entry);
@@ -5455,10 +5459,10 @@ send_process (volatile Lisp_Object proc, const char *volatile buf,
 
   if (p->raw_status_new)
     update_status (p);
-  if (! EQ (p->status, Qrun))
-    error ("Process %s not running", SDATA (p->name));
+  if (! EQ (PVAR (p, status), Qrun))
+    error ("Process %s not running", SDATA (PVAR (p, name)));
   if (p->outfd < 0)
-    error ("Output file descriptor of %s is closed", SDATA (p->name));
+    error ("Output file descriptor of %s is closed", SDATA (PVAR (p, name)));
 
   coding = proc_encode_coding_system[p->outfd];
   Vlast_coding_system_used = CODING_ID_NAME (coding->id);
@@ -5468,9 +5472,9 @@ send_process (volatile Lisp_Object proc, const char *volatile buf,
           && !NILP (BVAR (XBUFFER (object), enable_multibyte_characters)))
       || EQ (object, Qt))
     {
-      p->encode_coding_system
-        = complement_process_encoding_system (p->encode_coding_system);
-      if (!EQ (Vlast_coding_system_used, p->encode_coding_system))
+      PVAR (p, encode_coding_system)
+        = complement_process_encoding_system (PVAR (p, encode_coding_system));
+      if (!EQ (Vlast_coding_system_used, PVAR (p, encode_coding_system)))
         {
           /* The coding system for encoding was changed to raw-text
              because we sent a unibyte text previously.  Now we are
@@ -5480,8 +5484,8 @@ send_process (volatile Lisp_Object proc, const char *volatile buf,
              Another reason we come here is that the coding system
              was just complemented and a new one was returned by
              complement_process_encoding_system.  */
-          setup_coding_system (p->encode_coding_system, coding);
-          Vlast_coding_system_used = p->encode_coding_system;
+          setup_coding_system (PVAR (p, encode_coding_system), coding);
+          Vlast_coding_system_used = PVAR (p, encode_coding_system);
         }
       coding->src_multibyte = 1;
     }
@@ -5568,7 +5572,7 @@ send_process (volatile Lisp_Object proc, const char *volatile buf,
 
       /* If there is already data in the write_queue, put the new data
          in the back of queue.  Otherwise, ignore it.  */
-      if (!NILP (p->write_queue))
+      if (!NILP (PVAR (p, write_queue)))
         write_queue_push (p, object, buf, len, 0);
 
       do   /* while !NILP (p->write_queue) */
@@ -5682,7 +5686,7 @@ send_process (volatile Lisp_Object proc, const char *volatile buf,
               cur_len -= written;
             }
         }
-      while (!NILP (p->write_queue));
+      while (!NILP (PVAR (p, write_queue)));
     }
   else
     {
@@ -5690,10 +5694,10 @@ send_process (volatile Lisp_Object proc, const char *volatile buf,
       proc = process_sent_to;
       p = XPROCESS (proc);
       p->raw_status_new = 0;
-      p->status = Fcons (Qexit, Fcons (make_number (256), Qnil));
+      PVAR (p, status) = Fcons (Qexit, Fcons (make_number (256), Qnil));
       p->tick = ++process_tick;
       deactivate_process (proc);
-      error ("SIGPIPE raised on process %s; closed it", SDATA (p->name));
+      error ("SIGPIPE raised on process %s; closed it", SDATA (PVAR (p, name)));
     }
 }
 
@@ -5751,12 +5755,12 @@ emacs_get_tty_pgrp (struct Lisp_Process *p)
   pid_t gid = -1;
 
 #ifdef TIOCGPGRP
-  if (ioctl (p->infd, TIOCGPGRP, &gid) == -1 && ! NILP (p->tty_name))
+  if (ioctl (p->infd, TIOCGPGRP, &gid) == -1 && ! NILP (PVAR (p, tty_name)))
     {
       int fd;
       /* Some OS:es (Solaris 8/9) does not allow TIOCGPGRP from the
          master side.  Try the slave side.  */
-      fd = emacs_open (SSDATA (p->tty_name), O_RDONLY, 0);
+      fd = emacs_open (SSDATA (PVAR (p, tty_name)), O_RDONLY, 0);
 
       if (fd != -1)
         {
@@ -5785,12 +5789,12 @@ return t unconditionally.  */)
   proc = get_process (process);
   p = XPROCESS (proc);
 
-  if (!EQ (p->type, Qreal))
+  if (!EQ (PVAR (p, type), Qreal))
     error ("Process %s is not a subprocess",
-           SDATA (p->name));
+           SDATA (PVAR (p, name)));
   if (p->infd < 0)
     error ("Process %s is not active",
-           SDATA (p->name));
+           SDATA (PVAR (p, name)));
 
   gid = emacs_get_tty_pgrp (p);
 
@@ -5825,12 +5829,12 @@ process_send_signal (Lisp_Object process, int signo, Lisp_Object current_group,
   proc = get_process (process);
   p = XPROCESS (proc);
 
-  if (!EQ (p->type, Qreal))
+  if (!EQ (PVAR (p, type), Qreal))
     error ("Process %s is not a subprocess",
-           SDATA (p->name));
+           SDATA (PVAR (p, name)));
   if (p->infd < 0)
     error ("Process %s is not active",
-           SDATA (p->name));
+           SDATA (PVAR (p, name)));
 
   if (!p->pty_flag)
     current_group = Qnil;
@@ -5919,7 +5923,7 @@ process_send_signal (Lisp_Object process, int signo, Lisp_Object current_group,
 #ifdef SIGCONT
     case SIGCONT:
       p->raw_status_new = 0;
-      p->status = Qrun;
+      PVAR (p, status) = Qrun;
       p->tick = ++process_tick;
       if (!nomsg)
         {
@@ -6009,13 +6013,13 @@ traffic.  */)
       struct Lisp_Process *p;
 
       p = XPROCESS (process);
-      if (NILP (p->command)
+      if (NILP (PVAR (p, command))
           && p->infd >= 0)
         {
           FD_CLR (p->infd, &input_wait_mask);
           FD_CLR (p->infd, &non_keyboard_wait_mask);
         }
-      p->command = Qt;
+      PVAR (p, command) = Qt;
       return process;
     }
 #ifndef SIGTSTP
@@ -6038,9 +6042,9 @@ traffic.  */)
       struct Lisp_Process *p;
 
       p = XPROCESS (process);
-      if (EQ (p->command, Qt)
+      if (EQ (PVAR (p, command), Qt)
           && p->infd >= 0
-          && (!EQ (p->filter, Qt) || EQ (p->status, Qlisten)))
+          && (!EQ (PVAR (p, filter), Qt) || EQ (PVAR (p, status), Qlisten)))
         {
           FD_SET (p->infd, &input_wait_mask);
           FD_SET (p->infd, &non_keyboard_wait_mask);
@@ -6051,7 +6055,7 @@ traffic.  */)
           tcflush (p->infd, TCIFLUSH);
 #endif /* not WINDOWSNT */
         }
-      p->command = Qnil;
+      PVAR (p, command) = Qnil;
       return process;
     }
 #ifdef SIGCONT
@@ -6098,7 +6102,8 @@ SIGCODE may be an integer, or a symbol whose name is a signal name.  */)
       CHECK_PROCESS (process);
       pid = XPROCESS (process)->pid;
       if (pid <= 0)
-        error ("Cannot signal process %s", SDATA (XPROCESS (process)->name));
+        error ("Cannot signal process %s",
+               SDATA (PVAR (XPROCESS (process), name)));
     }
 
 #define parse_signal(NAME, VALUE)               \
@@ -6242,8 +6247,8 @@ process has been transmitted to the serial port.  */)
   /* Make sure the process is really alive.  */
   if (XPROCESS (proc)->raw_status_new)
     update_status (XPROCESS (proc));
-  if (! EQ (XPROCESS (proc)->status, Qrun))
-    error ("Process %s not running", SDATA (XPROCESS (proc)->name));
+  if (! EQ (PVAR (XPROCESS (proc), status), Qrun))
+    error ("Process %s not running", SDATA (PVAR (XPROCESS (proc), name)));
 
   if (CODING_REQUIRE_FLUSHING (coding))
     {
@@ -6253,7 +6258,7 @@ process has been transmitted to the serial port.  */)
 
   if (XPROCESS (proc)->pty_flag)
     send_process (proc, "\004", 1, Qnil);
-  else if (EQ (XPROCESS (proc)->type, Qserial))
+  else if (EQ (PVAR (XPROCESS (proc), type), Qserial))
     {
 #ifndef WINDOWSNT
       if (tcdrain (XPROCESS (proc)->outfd) != 0)
@@ -6270,7 +6275,7 @@ process has been transmitted to the serial port.  */)
          for communication with the subprocess, call shutdown to cause EOF.
          (In some old system, shutdown to socketpair doesn't work.
          Then we just can't win.)  */
-      if (EQ (XPROCESS (proc)->type, Qnetwork)
+      if (EQ (PVAR (XPROCESS (proc), type), Qnetwork)
           || XPROCESS (proc)->outfd == XPROCESS (proc)->infd)
         shutdown (XPROCESS (proc)->outfd, 1);
       /* In case of socketpair, outfd == infd, so don't close it.  */
@@ -6383,7 +6388,7 @@ sigchld_handler (int signo)
         {
           proc = XCDR (XCAR (tail));
           p = XPROCESS (proc);
-          if (EQ (p->type, Qreal) && p->pid == pid)
+          if (EQ (PVAR (p, type), Qreal) && p->pid == pid)
             break;
           p = 0;
         }
@@ -6467,7 +6472,7 @@ sigchld_handler (int signo)
 static Lisp_Object
 exec_sentinel_unwind (Lisp_Object data)
 {
-  XPROCESS (XCAR (data))->sentinel = XCDR (data);
+  PVAR (XPROCESS (XCAR (data)), sentinel) = XCDR (data);
   return Qnil;
 }
 
@@ -6507,13 +6512,13 @@ exec_sentinel (Lisp_Object proc, Lisp_Object reason)
      friends don't expect current-buffer to be changed from under them.  */
   record_unwind_protect (set_buffer_if_live, Fcurrent_buffer ());
 
-  sentinel = p->sentinel;
+  sentinel = PVAR (p, sentinel);
   if (NILP (sentinel))
     return;
 
   /* Zilch the sentinel while it's running, to avoid recursive invocations;
      assure that it gets restored no matter how the sentinel exits.  */
-  p->sentinel = Qnil;
+  PVAR (p, sentinel) = Qnil;
   record_unwind_protect (exec_sentinel_unwind, Fcons (proc, sentinel));
   /* Inhibit quit so that random quits don't screw up a running filter.  */
   specbind (Qinhibit_quit, Qt);
@@ -6601,16 +6606,16 @@ status_notify (struct Lisp_Process *deleting_process)
           p->update_tick = p->tick;
 
           /* If process is still active, read any output that remains.  */
-          while (! EQ (p->filter, Qt)
-                 && ! EQ (p->status, Qconnect)
-                 && ! EQ (p->status, Qlisten)
+          while (! EQ (PVAR (p, filter), Qt)
+                 && ! EQ (PVAR (p, status), Qconnect)
+                 && ! EQ (PVAR (p, status), Qlisten)
                  /* Network or serial process not stopped:  */
-                 && ! EQ (p->command, Qt)
+                 && ! EQ (PVAR (p, command), Qt)
                  && p->infd >= 0
                  && p != deleting_process
                  && read_process_output (proc, p->infd) > 0);
 
-          buffer = p->buffer;
+          buffer = PVAR (p, buffer);
 
           /* Get the text to use for the message.  */
           if (p->raw_status_new)
@@ -6618,9 +6623,9 @@ status_notify (struct Lisp_Process *deleting_process)
           msg = status_message (p);
 
           /* If process is terminated, deactivate it or delete it.  */
-          symbol = p->status;
-          if (CONSP (p->status))
-            symbol = XCAR (p->status);
+          symbol = PVAR (p, status);
+          if (CONSP (PVAR (p, status)))
+            symbol = XCAR (PVAR (p, status));
 
           if (EQ (symbol, Qsignal) || EQ (symbol, Qexit)
               || EQ (symbol, Qclosed))
@@ -6637,7 +6642,7 @@ status_notify (struct Lisp_Process *deleting_process)
              this code to be run again.  */
           p->update_tick = p->tick;
           /* Now output the message suitably.  */
-          if (!NILP (p->sentinel))
+          if (!NILP (PVAR (p, sentinel)))
             exec_sentinel (proc, msg);
           /* Don't bother with a message in the buffer
              when a process becomes runnable.  */
@@ -6659,8 +6664,8 @@ status_notify (struct Lisp_Process *deleting_process)
               /* Insert new output into buffer
                  at the current end-of-output marker,
                  thus preserving logical ordering of input and output.  */
-              if (XMARKER (p->mark)->buffer)
-                Fgoto_char (p->mark);
+              if (XMARKER (PVAR (p, mark))->buffer)
+                Fgoto_char (PVAR (p, mark));
               else
                 SET_PT_BOTH (ZV, ZV_BYTE);
 
@@ -6670,11 +6675,11 @@ status_notify (struct Lisp_Process *deleting_process)
               tem = BVAR (current_buffer, read_only);
               BVAR (current_buffer, read_only) = Qnil;
               insert_string ("\nProcess ");
-              Finsert (1, &p->name);
+              Finsert (1, &PVAR (p, name));
               insert_string (" ");
               Finsert (1, &msg);
               BVAR (current_buffer, read_only) = tem;
-              set_marker_both (p->mark, p->buffer, PT, PT_BYTE);
+              set_marker_both (PVAR (p, mark), PVAR (p, buffer), PT, PT_BYTE);
 
               if (opoint >= before)
                 SET_PT_BOTH (opoint + (PT - before),
@@ -6704,14 +6709,14 @@ encode subprocess input.  */)
   CHECK_PROCESS (process);
   p = XPROCESS (process);
   if (p->infd < 0)
-    error ("Input file descriptor of %s closed", SDATA (p->name));
+    error ("Input file descriptor of %s closed", SDATA (PVAR (p, name)));
   if (p->outfd < 0)
-    error ("Output file descriptor of %s closed", SDATA (p->name));
+    error ("Output file descriptor of %s closed", SDATA (PVAR (p, name)));
   Fcheck_coding_system (decoding);
   Fcheck_coding_system (encoding);
   encoding = coding_inherit_eol_type (encoding, Qnil);
-  p->decode_coding_system = decoding;
-  p->encode_coding_system = encoding;
+  PVAR (p, decode_coding_system) = decoding;
+  PVAR (p, encode_coding_system) = encoding;
   setup_process_coding_systems (process);
 
   return Qnil;
@@ -6723,8 +6728,8 @@ DEFUN ("process-coding-system",
   (register Lisp_Object process)
 {
   CHECK_PROCESS (process);
-  return Fcons (XPROCESS (process)->decode_coding_system,
-                XPROCESS (process)->encode_coding_system);
+  return Fcons (PVAR (XPROCESS (process), decode_coding_system),
+                PVAR (XPROCESS (process), encode_coding_system));
 }
 
 DEFUN ("set-process-filter-multibyte", Fset_process_filter_multibyte,
@@ -6741,7 +6746,8 @@ suppressed.  */)
   CHECK_PROCESS (process);
   p = XPROCESS (process);
   if (NILP (flag))
-    p->decode_coding_system = raw_text_coding_system (p->decode_coding_system);
+    PVAR (p, decode_coding_system) 
+      = raw_text_coding_system (PVAR (p, decode_coding_system));
   setup_process_coding_systems (process);
 
   return Qnil;
@@ -7079,19 +7085,19 @@ setup_process_coding_systems (Lisp_Object process)
 
   if (!proc_decode_coding_system[inch])
     proc_decode_coding_system[inch] = xmalloc (sizeof (struct coding_system));
-  coding_system = p->decode_coding_system;
-  if (! NILP (p->filter))
+  coding_system = PVAR (p, decode_coding_system);
+  if (! NILP (PVAR (p, filter)))
     ;
-  else if (BUFFERP (p->buffer))
+  else if (BUFFERP (PVAR (p, buffer)))
     {
-      if (NILP (BVAR (XBUFFER (p->buffer), enable_multibyte_characters)))
+      if (NILP (BVAR (XBUFFER (PVAR (p, buffer)), enable_multibyte_characters)))
         coding_system = raw_text_coding_system (coding_system);
     }
   setup_coding_system (coding_system, proc_decode_coding_system[inch]);
 
   if (!proc_encode_coding_system[outch])
     proc_encode_coding_system[outch] = xmalloc (sizeof (struct coding_system));
-  setup_coding_system (p->encode_coding_system,
+  setup_coding_system (PVAR (p, encode_coding_system),
                        proc_encode_coding_system[outch]);
 #endif
 }
@@ -7137,7 +7143,7 @@ BUFFER may be a buffer or the name of one.  */)
   for (tail = Vprocess_alist; CONSP (tail); tail = XCDR (tail))
     {
       proc = Fcdr (XCAR (tail));
-      if (PROCESSP (proc) && EQ (XPROCESS (proc)->buffer, buf))
+      if (PROCESSP (proc) && EQ (PVAR (XPROCESS (proc), buffer), buf))
         return proc;
     }
 #endif  /* subprocesses */
@@ -7176,7 +7182,7 @@ kill_buffer_processes (Lisp_Object buffer)
     {
       proc = XCDR (XCAR (tail));
       if (PROCESSP (proc)
-          && (NILP (buffer) || EQ (XPROCESS (proc)->buffer, buffer)))
+          && (NILP (buffer) || EQ (PVAR (XPROCESS (proc), buffer), buffer)))
         {
           if (NETCONN_P (proc) || SERIALCONN_P (proc))
             Fdelete_process (proc);
diff --git a/src/process.h b/src/process.h
index 747540f26a9..dafa870b620 100644
--- a/src/process.h
+++ b/src/process.h
@@ -26,59 +26,78 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 #include "gnutls.h"
 #endif
 
-/* This structure records information about a subprocess
-   or network connection.
+/* Most code should use this macro to access
+   Lisp fields in struct Lisp_Process.  */
 
-   Every field in this structure except for the header
-   must be a Lisp_Object, for GC's sake.  */
+#define PVAR(w, field) ((w)->INTERNAL_FIELD (field))
+
+/* This structure records information about a subprocess
+   or network connection.  */
 
 struct Lisp_Process
   {
     struct vectorlike_header header;
 
     /* Name of subprocess terminal.  */
-    Lisp_Object tty_name;
+    Lisp_Object INTERNAL_FIELD (tty_name);
+
     /* Name of this process */
-    Lisp_Object name;
+    Lisp_Object INTERNAL_FIELD (name);
+
     /* List of command arguments that this process was run with.
        Is set to t for a stopped network process; nil otherwise. */
-    Lisp_Object command;
+    Lisp_Object INTERNAL_FIELD (command);
+
     /* (funcall FILTER PROC STRING)  (if FILTER is non-nil)
        to dispose of a bunch of chars from the process all at once */
-    Lisp_Object filter;
+    Lisp_Object INTERNAL_FIELD (filter);
+
     /* (funcall SENTINEL PROCESS) when process state changes */
-    Lisp_Object sentinel;
+    Lisp_Object INTERNAL_FIELD (sentinel);
+
     /* (funcall LOG SERVER CLIENT MESSAGE) when a server process
        accepts a connection from a client.  */
-    Lisp_Object log;
+    Lisp_Object INTERNAL_FIELD (log);
+
     /* Buffer that output is going to */
-    Lisp_Object buffer;
+    Lisp_Object INTERNAL_FIELD (buffer);
+
     /* t if this is a real child process.  For a network or serial
        connection, it is a plist based on the arguments to
        make-network-process or make-serial-process.  */
-    Lisp_Object childp;
+
+    Lisp_Object INTERNAL_FIELD (childp);
+
     /* Plist for programs to keep per-process state information, parameters, etc.  */
-    Lisp_Object plist;
+    Lisp_Object INTERNAL_FIELD (plist);
+
     /* Symbol indicating the type of process: real, network, serial  */
-    Lisp_Object type;
+    Lisp_Object INTERNAL_FIELD (type);
+
     /* Marker set to end of last buffer-inserted output from this process */
-    Lisp_Object mark;
+    Lisp_Object INTERNAL_FIELD (mark);
+
     /* Symbol indicating status of process.
        This may be a symbol: run, open, or closed.
        Or it may be a list, whose car is stop, exit or signal
        and whose cdr is a pair (EXIT_CODE . COREDUMP_FLAG)
        or (SIGNAL_NUMBER . COREDUMP_FLAG).  */
-    Lisp_Object status;
+    Lisp_Object INTERNAL_FIELD (status);
+
     /* Coding-system for decoding the input from this process.  */
-    Lisp_Object decode_coding_system;
+    Lisp_Object INTERNAL_FIELD (decode_coding_system);
+
     /* Working buffer for decoding.  */
-    Lisp_Object decoding_buf;
+    Lisp_Object INTERNAL_FIELD (decoding_buf);
+
     /* Coding-system for encoding the output to this process.  */
-    Lisp_Object encode_coding_system;
+    Lisp_Object INTERNAL_FIELD (encode_coding_system);
+
     /* Working buffer for encoding.  */
-    Lisp_Object encoding_buf;
+    Lisp_Object INTERNAL_FIELD (encoding_buf);
+
     /* Queue for storing waiting writes */
-    Lisp_Object write_queue;
+    Lisp_Object INTERNAL_FIELD (write_queue);
 
 #ifdef HAVE_GNUTLS
     Lisp_Object gnutls_cred_type;
diff --git a/src/sysdep.c b/src/sysdep.c
index 6ce583b3d53..2bfdb35fdfb 100644
--- a/src/sysdep.c
+++ b/src/sysdep.c
@@ -2156,7 +2156,7 @@ serial_configure (struct Lisp_Process *p,
   int err = -1;
   char summary[4] = "???"; /* This usually becomes "8N1".  */
 
-  childp2 = Fcopy_sequence (p->childp);
+  childp2 = Fcopy_sequence (PVAR (p, childp));
 
   /* Read port attributes and prepare default configuration.  */
   err = tcgetattr (p->outfd, &attr);
@@ -2174,7 +2174,7 @@ serial_configure (struct Lisp_Process *p,
   if (!NILP (Fplist_member (contact, QCspeed)))
     tem = Fplist_get (contact, QCspeed);
   else
-    tem = Fplist_get (p->childp, QCspeed);
+    tem = Fplist_get (PVAR (p, childp), QCspeed);
   CHECK_NUMBER (tem);
   err = cfsetspeed (&attr, XINT (tem));
   if (err != 0)
@@ -2186,7 +2186,7 @@ serial_configure (struct Lisp_Process *p,
   if (!NILP (Fplist_member (contact, QCbytesize)))
     tem = Fplist_get (contact, QCbytesize);
   else
-    tem = Fplist_get (p->childp, QCbytesize);
+    tem = Fplist_get (PVAR (p, childp), QCbytesize);
   if (NILP (tem))
     tem = make_number (8);
   CHECK_NUMBER (tem);
@@ -2207,7 +2207,7 @@ serial_configure (struct Lisp_Process *p,
   if (!NILP (Fplist_member (contact, QCparity)))
     tem = Fplist_get (contact, QCparity);
   else
-    tem = Fplist_get (p->childp, QCparity);
+    tem = Fplist_get (PVAR (p, childp), QCparity);
   if (!NILP (tem) && !EQ (tem, Qeven) && !EQ (tem, Qodd))
     error (":parity must be nil (no parity), `even', or `odd'");
 #if defined (PARENB) && defined (PARODD) && defined (IGNPAR) && defined (INPCK)
@@ -2240,7 +2240,7 @@ serial_configure (struct Lisp_Process *p,
   if (!NILP (Fplist_member (contact, QCstopbits)))
     tem = Fplist_get (contact, QCstopbits);
   else
-    tem = Fplist_get (p->childp, QCstopbits);
+    tem = Fplist_get (PVAR (p, childp), QCstopbits);
   if (NILP (tem))
     tem = make_number (1);
   CHECK_NUMBER (tem);
@@ -2262,7 +2262,7 @@ serial_configure (struct Lisp_Process *p,
   if (!NILP (Fplist_member (contact, QCflowcontrol)))
     tem = Fplist_get (contact, QCflowcontrol);
   else
-    tem = Fplist_get (p->childp, QCflowcontrol);
+    tem = Fplist_get (PVAR (p, childp), QCflowcontrol);
   if (!NILP (tem) && !EQ (tem, Qhw) && !EQ (tem, Qsw))
     error (":flowcontrol must be nil (no flowcontrol), `hw', or `sw'");
 #if defined (CRTSCTS)
@@ -2304,7 +2304,7 @@ serial_configure (struct Lisp_Process *p,
     error ("tcsetattr() failed: %s", emacs_strerror (errno));
 
   childp2 = Fplist_put (childp2, QCsummary, build_string (summary));
-  p->childp = childp2;
+  PVAR (p, childp) = childp2;
 
 }
 #endif /* not DOS_NT  */
diff --git a/src/w32.c b/src/w32.c
index a9f4f6fb50e..5d2c8a34495 100644
--- a/src/w32.c
+++ b/src/w32.c
@@ -6144,7 +6144,7 @@ serial_configure (struct Lisp_Process *p, Lisp_Object contact)
     error ("Not a serial process");
   hnd = fd_info[ p->outfd ].hnd;
 
-  childp2 = Fcopy_sequence (p->childp);
+  childp2 = Fcopy_sequence (PVAR (p, childp));
 
   /* Initialize timeouts for blocking read and blocking write.  */
   if (!GetCommTimeouts (hnd, &ct))
@@ -6173,7 +6173,7 @@ serial_configure (struct Lisp_Process *p, Lisp_Object contact)
   if (!NILP (Fplist_member (contact, QCspeed)))
     tem = Fplist_get (contact, QCspeed);
   else
-    tem = Fplist_get (p->childp, QCspeed);
+    tem = Fplist_get (PVAR (p, childp), QCspeed);
   CHECK_NUMBER (tem);
   dcb.BaudRate = XINT (tem);
   childp2 = Fplist_put (childp2, QCspeed, tem);
@@ -6182,7 +6182,7 @@ serial_configure (struct Lisp_Process *p, Lisp_Object contact)
   if (!NILP (Fplist_member (contact, QCbytesize)))
     tem = Fplist_get (contact, QCbytesize);
   else
-    tem = Fplist_get (p->childp, QCbytesize);
+    tem = Fplist_get (PVAR (p, childp), QCbytesize);
   if (NILP (tem))
     tem = make_number (8);
   CHECK_NUMBER (tem);
@@ -6196,7 +6196,7 @@ serial_configure (struct Lisp_Process *p, Lisp_Object contact)
   if (!NILP (Fplist_member (contact, QCparity)))
     tem = Fplist_get (contact, QCparity);
   else
-    tem = Fplist_get (p->childp, QCparity);
+    tem = Fplist_get (PVAR (p, childp), QCparity);
   if (!NILP (tem) && !EQ (tem, Qeven) && !EQ (tem, Qodd))
     error (":parity must be nil (no parity), `even', or `odd'");
   dcb.fParity = FALSE;
@@ -6226,7 +6226,7 @@ serial_configure (struct Lisp_Process *p, Lisp_Object contact)
   if (!NILP (Fplist_member (contact, QCstopbits)))
     tem = Fplist_get (contact, QCstopbits);
   else
-    tem = Fplist_get (p->childp, QCstopbits);
+    tem = Fplist_get (PVAR (p, childp), QCstopbits);
   if (NILP (tem))
     tem = make_number (1);
   CHECK_NUMBER (tem);
@@ -6243,7 +6243,7 @@ serial_configure (struct Lisp_Process *p, Lisp_Object contact)
   if (!NILP (Fplist_member (contact, QCflowcontrol)))
     tem = Fplist_get (contact, QCflowcontrol);
   else
-    tem = Fplist_get (p->childp, QCflowcontrol);
+    tem = Fplist_get (PVAR (p, childp), QCflowcontrol);
   if (!NILP (tem) && !EQ (tem, Qhw) && !EQ (tem, Qsw))
     error (":flowcontrol must be nil (no flowcontrol), `hw', or `sw'");
   dcb.fOutxCtsFlow      = FALSE;
@@ -6277,7 +6277,7 @@ serial_configure (struct Lisp_Process *p, Lisp_Object contact)
     error ("SetCommState() failed");
 
   childp2 = Fplist_put (childp2, QCsummary, build_string (summary));
-  p->childp = childp2;
+  PVAR (p, childp) = childp2;
 }
 
 #ifdef HAVE_GNUTLS
diff --git a/src/xdisp.c b/src/xdisp.c
index 153e139b043..7d7e2acc74d 100644
--- a/src/xdisp.c
+++ b/src/xdisp.c
@@ -21678,10 +21678,10 @@ decode_mode_spec (struct window *w, register int c, int field_width,
         obj = Fget_buffer_process (Fcurrent_buffer ());
         if (PROCESSP (obj))
           {
-            p = decode_mode_spec_coding (XPROCESS (obj)->decode_coding_system,
-                                         p, eol_flag);
-            p = decode_mode_spec_coding (XPROCESS (obj)->encode_coding_system,
-                                         p, eol_flag);
+            p = decode_mode_spec_coding
+              (PVAR (XPROCESS (obj), decode_coding_system), p, eol_flag);
+            p = decode_mode_spec_coding
+              (PVAR (XPROCESS (obj), encode_coding_system), p, eol_flag);
           }
 #endif /* subprocesses */
 #endif /* 0 */