Remove mark_maybe_object

* src/alloc.c (mark_maybe_object, mark_maybe_objects): Remove.
(mark_objects): New function.
* src/eval.c (mark_specpdl): Use mark_objects instead of
mark_maybe_objects, since the array now has only valid Lisp objects.
* src/lisp.h (SAFE_ALLOCA_LISP_EXTRA): When allocating a large
array, clear it so that it contains only valid Lisp objects.  This
is simpler and safer, and does not hurt performance significantly
on my usual benchmark as the code is executed so rarely.

1 files changed, 14 insertions, 91 deletions

diff --git a/src/alloc.c b/src/alloc.c
index 5453c54d931..2f66b5eef52 100644
--- a/src/alloc.c
+++ b/src/alloc.c
@@ -4680,117 +4680,33 @@ live_small_vector_p (struct mem_node *m, void *p)
   return live_small_vector_holding (m, p) == p;
 }
 
-/* Mark OBJ if we can prove it's a Lisp_Object.  */
+/* If P points to Lisp data, mark that as live if it isn't already
+   marked.  */
 
 static void
-mark_maybe_object (Lisp_Object obj)
+mark_maybe_pointer (void *p)
 {
+  struct mem_node *m;
+
 #if USE_VALGRIND
-  VALGRIND_MAKE_MEM_DEFINED (&obj, sizeof (obj));
+  VALGRIND_MAKE_MEM_DEFINED (&p, sizeof (p));
 #endif
 
-  int type_tag = XTYPE (obj);
-  intptr_t pointer_word_tag = LISP_WORD_TAG (type_tag), offset, ipo;
-
-  switch (type_tag)
-    {
-    case_Lisp_Int: case Lisp_Type_Unused0:
-      return;
-
-    case Lisp_Symbol:
-      offset = (intptr_t) lispsym;
-      break;
-
-    default:
-      offset = 0;
-      break;
-    }
-
-  INT_ADD_WRAPV ((intptr_t) XLP (obj), offset - pointer_word_tag, &ipo);
-  void *po = (void *) ipo;
-
   /* If the pointer is in the dump image and the dump has a record
      of the object starting at the place where the pointer points, we
      definitely have an object.  If the pointer is in the dump image
      and the dump has no idea what the pointer is pointing at, we
      definitely _don't_ have an object.  */
-  if (pdumper_object_p (po))
+  if (pdumper_object_p (p))
     {
       /* Don't use pdumper_object_p_precise here! It doesn't check the
          tag bits. OBJ here might be complete garbage, so we need to
          verify both the pointer and the tag.  */
-      if (pdumper_find_object_type (po) == type_tag)
-        mark_object (obj);
-      return;
-    }
-
-  struct mem_node *m = mem_find (po);
-
-  if (m != MEM_NIL)
-    {
-      bool mark_p = false;
-
-      switch (type_tag)
-        {
-        case Lisp_String:
-          mark_p = m->type == MEM_TYPE_STRING && live_string_p (m, po);
-          break;
-
-        case Lisp_Cons:
-          mark_p = m->type == MEM_TYPE_CONS && live_cons_p (m, po);
-          break;
-
-        case Lisp_Symbol:
-          mark_p = m->type == MEM_TYPE_SYMBOL && live_symbol_p (m, po);
-          break;
-
-        case Lisp_Float:
-          mark_p = m->type == MEM_TYPE_FLOAT && live_float_p (m, po);
-          break;
-
-        case Lisp_Vectorlike:
-          mark_p = (m->type == MEM_TYPE_VECTOR_BLOCK
-                    ? live_small_vector_p (m, po)
-                    : (m->type == MEM_TYPE_VECTORLIKE
-                       && live_large_vector_p (m, po)));
-          break;
-
-        default:
-          eassume (false);
-        }
-
-      if (mark_p)
-        mark_object (obj);
-    }
-}
-
-void
-mark_maybe_objects (Lisp_Object const *array, ptrdiff_t nelts)
-{
-  for (Lisp_Object const *lim = array + nelts; array < lim; array++)
-    mark_maybe_object (*array);
-}
-
-/* If P points to Lisp data, mark that as live if it isn't already
-   marked.  */
-
-static void
-mark_maybe_pointer (void *p)
-{
-  struct mem_node *m;
-
-#if USE_VALGRIND
-  VALGRIND_MAKE_MEM_DEFINED (&p, sizeof (p));
-#endif
-
-  if (pdumper_object_p (p))
-    {
       int type = pdumper_find_object_type (p);
       if (pdumper_valid_object_type_p (type))
         mark_object (type == Lisp_Symbol
                      ? make_lisp_symbol (p)
                      : make_lisp_ptr (p, type));
-      /* See mark_maybe_object for why we can confidently return.  */
       return;
     }
 
@@ -6570,6 +6486,13 @@ mark_hash_table (struct Lisp_Vector *ptr)
     }
 }
 
+void
+mark_objects (Lisp_Object *obj, ptrdiff_t n)
+{
+  for (ptrdiff_t i = 0; i < n; i++)
+    mark_object (obj[i]);
+}
+
 /* Determine type of generic Lisp_Object and mark it accordingly.
 
    This function implements a straightforward depth-first marking