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add flag to vtables to indicate that their layout is valid

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* libguile/struct.h (SCM_VTABLE_FLAG_VALIDATED): New flag, indicates
  that the layout of a vtable has been validated. The other flags have
  been renumbered.

* libguile/struct.c (scm_i_struct_inherit_vtable_magic): Set the
  VALIDATED flag if everything goes through.
  (scm_struct_vtable_p): If the struct should be a vtable but isn't
  validated, throw an error.
  (scm_make_vtable_vtable): Validate the incoming user_fields layout
  bit. Set the VALIDATED flag.
  (scm_c_make_structv): Add a comment about the case in which we delay
  scm_i_struct_inherit_vtable_magic.
This commit is contained in:
Andy Wingo 2010-08-29 11:37:29 -07:00
parent c89920a71f
commit a2220d7ea4
2 changed files with 37 additions and 25 deletions
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30
libguile/struct.c
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@ -260,7 +260,7 @@ scm_i_struct_inherit_vtable_magic (SCM vtable, SCM obj)
/* Verify that OBJ is a valid vtable. */
if (! scm_is_valid_vtable_layout (SCM_VTABLE_LAYOUT (obj)))
scm_misc_error (FUNC_NAME, "invalid layout for new vtable: ~a",
SCM_MISC_ERROR ("invalid layout for new vtable: ~a",
scm_list_1 (SCM_VTABLE_LAYOUT (obj)));
set_vtable_layout_flags (obj);
@ -286,7 +286,7 @@ scm_i_struct_inherit_vtable_magic (SCM vtable, SCM obj)
scm_from_size_t (4),
scm_from_size_t (0),
scm_from_size_t (4))))
scm_misc_error (FUNC_NAME, "invalid applicable-with-setter struct layout",
SCM_MISC_ERROR ("invalid applicable-with-setter struct layout",
scm_list_1 (olayout));
SCM_SET_VTABLE_FLAGS (obj, SCM_VTABLE_FLAG_APPLICABLE | SCM_VTABLE_FLAG_SETTER);
}
@ -297,10 +297,12 @@ scm_i_struct_inherit_vtable_magic (SCM vtable, SCM obj)
scm_from_size_t (2),
scm_from_size_t (0),
scm_from_size_t (2))))
scm_misc_error (FUNC_NAME, "invalid applicable struct layout",
SCM_MISC_ERROR ("invalid applicable struct layout",
scm_list_1 (olayout));
SCM_SET_VTABLE_FLAGS (obj, SCM_VTABLE_FLAG_APPLICABLE);
}
SCM_SET_VTABLE_FLAGS (obj, SCM_VTABLE_FLAG_VALIDATED);
}
#undef FUNC_NAME
@ -396,9 +398,13 @@ SCM_DEFINE (scm_struct_vtable_p, "struct-vtable?", 1, 0, 0,
"Return @code{#t} iff @var{x} is a vtable structure.")
#define FUNC_NAME s_scm_struct_vtable_p
{
return scm_from_bool
(SCM_STRUCTP (x)
&& SCM_STRUCT_VTABLE_FLAG_IS_SET (x, SCM_VTABLE_FLAG_VTABLE));
if (!SCM_STRUCTP (x)
|| !SCM_STRUCT_VTABLE_FLAG_IS_SET (x, SCM_VTABLE_FLAG_VTABLE))
return SCM_BOOL_F;
if (!SCM_VTABLE_FLAG_IS_SET (x, SCM_VTABLE_FLAG_VALIDATED))
SCM_MISC_ERROR ("vtable has invalid layout: ~A",
scm_list_1 (SCM_VTABLE_LAYOUT (x)));
return SCM_BOOL_T;
}
#undef FUNC_NAME
@ -487,8 +493,10 @@ scm_c_make_structv (SCM vtable, size_t n_tail, size_t n_init, scm_t_bits *init)
scm_struct_init (obj, layout, n_tail, n_init, init);
/* only check things and inherit magic if the layout was passed as an initarg.
something of a hack, but it's for back-compatibility. */
/* If we're making a vtable, validate its layout and inherit
flags. However we allow for separation of allocation and
initialization, to humor GOOPS, so only validate if the layout was
passed as an initarg. */
if (SCM_VTABLE_FLAG_IS_SET (vtable, SCM_VTABLE_FLAG_VTABLE)
&& scm_is_true (SCM_VTABLE_LAYOUT (obj)))
scm_i_struct_inherit_vtable_magic (vtable, obj);
@ -633,6 +641,9 @@ SCM_DEFINE (scm_make_vtable_vtable, "make-vtable-vtable", 2, 0, 1,
fields = scm_string_append (scm_list_2 (required_vtable_fields,
user_fields));
layout = scm_make_struct_layout (fields);
if (!scm_is_valid_vtable_layout (layout))
SCM_MISC_ERROR ("invalid user fields", scm_list_1 (user_fields));
basic_size = scm_i_symbol_length (layout) / 2;
n_tail = scm_to_size_t (tail_array_size);
@ -648,7 +659,8 @@ SCM_DEFINE (scm_make_vtable_vtable, "make-vtable-vtable", 2, 0, 1,
SCM_CRITICAL_SECTION_END;
scm_struct_init (obj, layout, n_tail, n_init, v);
SCM_SET_VTABLE_FLAGS (obj, SCM_VTABLE_FLAG_VTABLE);
SCM_SET_VTABLE_FLAGS (obj,
SCM_VTABLE_FLAG_VTABLE | SCM_VTABLE_FLAG_VALIDATED);
return obj;
}