Simplify FUNCTIONP implementation

* src/bytecode.c (exec_byte_code):
* src/image.c (parse_image_spec):
Prefer FUNCTIONP (x) to !NILP (Ffunctionp (x)).
* src/eval.c (FUNCTIONP): Move here ...
* src/lisp.h: ... from here.  No longer inline, as that
bloats the text and does not help speed (at least on my platform).
(functionp): Remove this name, since callers use FUNCTIONP.

src/bytecode.c

@@ -809,8 +809,7 @@ exec_byte_code (Lisp_Object bytestr, Lisp_Object vector, Lisp_Object maxdepth,
 	  {
 	    Lisp_Object handler = POP;
 	    /* Support for a function here is new in 24.4.  */
-	    record_unwind_protect ((NILP (Ffunctionp (handler))
-				    ? unwind_body : bcall0),
+	    record_unwind_protect (FUNCTIONP (handler) ? bcall0 : unwind_body,
 				   handler);
 	    NEXT;
 	  }

src/dbusbind.c

@@ -1309,7 +1309,7 @@ usage: (dbus-message-internal &rest REST)  */)
       XD_DBUS_VALIDATE_PATH (path);
       XD_DBUS_VALIDATE_INTERFACE (interface);
       XD_DBUS_VALIDATE_MEMBER (member);
-      if (!NILP (handler) && (!FUNCTIONP (handler)))
+      if (!NILP (handler) && !FUNCTIONP (handler))
 	wrong_type_argument (Qinvalid_function, handler);
     }
 

src/eval.c

@@ -2638,6 +2638,37 @@ DEFUN ("functionp", Ffunctionp, Sfunctionp, 1, 1, 0,
   return Qnil;
 }
 
+bool
+FUNCTIONP (Lisp_Object object)
+{
+  if (SYMBOLP (object) && !NILP (Ffboundp (object)))
+    {
+      object = Findirect_function (object, Qt);
+
+      if (CONSP (object) && EQ (XCAR (object), Qautoload))
+	{
+	  /* Autoloaded symbols are functions, except if they load
+	     macros or keymaps.  */
+	  for (int i = 0; i < 4 && CONSP (object); i++)
+	    object = XCDR (object);
+
+	  return ! (CONSP (object) && !NILP (XCAR (object)));
+	}
+    }
+
+  if (SUBRP (object))
+    return XSUBR (object)->max_args != UNEVALLED;
+  else if (COMPILEDP (object))
+    return true;
+  else if (CONSP (object))
+    {
+      Lisp_Object car = XCAR (object);
+      return EQ (car, Qlambda) || EQ (car, Qclosure);
+    }
+  else
+    return false;
+}
+
 DEFUN ("funcall", Ffuncall, Sfuncall, 1, MANY, 0,
        doc: /* Call first argument as a function, passing remaining arguments to it.
 Return the value that function returns.

src/image.c

@@ -793,7 +793,7 @@ parse_image_spec (Lisp_Object spec, struct image_keyword *keywords,
 
 	case IMAGE_FUNCTION_VALUE:
 	  value = indirect_function (value);
-	  if (!NILP (Ffunctionp (value)))
+	  if (FUNCTIONP (value))
 	    break;
 	  return 0;
 

src/lisp.h

@@ -564,7 +564,6 @@ INLINE bool CHAR_TABLE_P (Lisp_Object);
 INLINE Lisp_Object CHAR_TABLE_REF_ASCII (Lisp_Object, ptrdiff_t);
 INLINE bool (CONSP) (Lisp_Object);
 INLINE bool (FLOATP) (Lisp_Object);
-INLINE bool functionp (Lisp_Object);
 INLINE bool (INTEGERP) (Lisp_Object);
 INLINE bool (MARKERP) (Lisp_Object);
 INLINE bool (MISCP) (Lisp_Object);
@@ -2994,13 +2993,6 @@ CHECK_NUMBER_CDR (Lisp_Object x)
    Lisp_Object fnname
 #endif
 
-/* True if OBJ is a Lisp function.  */
-INLINE bool
-FUNCTIONP (Lisp_Object obj)
-{
-  return functionp (obj);
-}
-
 /* defsubr (Sname);
    is how we define the symbol for function `name' at start-up time.  */
 extern void defsubr (struct Lisp_Subr *);
@@ -3915,6 +3907,7 @@ extern _Noreturn void xsignal2 (Lisp_Object, Lisp_Object, Lisp_Object);
 extern _Noreturn void xsignal3 (Lisp_Object, Lisp_Object, Lisp_Object,
 				Lisp_Object);
 extern _Noreturn void signal_error (const char *, Lisp_Object);
+extern bool FUNCTIONP (Lisp_Object);
 extern Lisp_Object funcall_subr (struct Lisp_Subr *subr, ptrdiff_t numargs, Lisp_Object *arg_vector);
 extern Lisp_Object eval_sub (Lisp_Object form);
 extern Lisp_Object apply1 (Lisp_Object, Lisp_Object);
@@ -4722,38 +4715,6 @@ maybe_gc (void)
     Fgarbage_collect ();
 }
 
-INLINE bool
-functionp (Lisp_Object object)
-{
-  if (SYMBOLP (object) && !NILP (Ffboundp (object)))
-    {
-      object = Findirect_function (object, Qt);
-
-      if (CONSP (object) && EQ (XCAR (object), Qautoload))
-	{
-	  /* Autoloaded symbols are functions, except if they load
-	     macros or keymaps.  */
-	  int i;
-	  for (i = 0; i < 4 && CONSP (object); i++)
-	    object = XCDR (object);
-
-	  return ! (CONSP (object) && !NILP (XCAR (object)));
-	}
-    }
-
-  if (SUBRP (object))
-    return XSUBR (object)->max_args != UNEVALLED;
-  else if (COMPILEDP (object))
-    return true;
-  else if (CONSP (object))
-    {
-      Lisp_Object car = XCAR (object);
-      return EQ (car, Qlambda) || EQ (car, Qclosure);
-    }
-  else
-    return false;
-}
-
 INLINE_HEADER_END
 
 #endif /* EMACS_LISP_H */

src/xwidget.c

@@ -711,7 +711,7 @@ argument procedure FUN.*/)
 {
   WEBKIT_FN_INIT ();
   CHECK_STRING (script);
-  if (!NILP (fun) && (!FUNCTIONP (fun)))
+  if (!NILP (fun) && !FUNCTIONP (fun))
     wrong_type_argument (Qinvalid_function, fun);
 
   void *callback = (FUNCTIONP (fun)) ?