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%null-pointer properly aligned

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* libguile/foreign.c: Allocate %null-pointer on the heap, to assure
  proper alignment.
This commit is contained in:
Andy Wingo 2010-05-20 01:00:37 +02:00
parent bdf7759c2b
commit 3e5ea35c2f
1 changed files with 5 additions and 7 deletions
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12
libguile/foreign.c
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@ -55,11 +55,7 @@ SCM_SYMBOL (sym_null, "%null-pointer");
SCM_SYMBOL (sym_null_pointer_error, "null-pointer-error");
/* The cell representing the null pointer. */
static const scm_t_bits null_pointer[2] =
{
scm_tc7_foreign | (SCM_FOREIGN_TYPE_VOID << 8UL),
0
};
static SCM null_pointer;
/* Raise a null pointer dereference error. */
static void
@ -172,7 +168,7 @@ SCM_DEFINE (scm_foreign_set_x, "foreign-set!", 2, 0, 0,
SCM_VALIDATE_FOREIGN (1, foreign);
if (SCM_UNLIKELY (scm_is_eq (foreign, PTR2SCM (&null_pointer))))
if (SCM_UNLIKELY (scm_is_eq (foreign, null_pointer)))
/* Attempting to modify the pointer value of NULL_POINTER (which is
read-only anyway), so raise an error. */
null_pointer_error (FUNC_NAME);
@ -1095,7 +1091,9 @@ scm_init_foreign (void)
#endif
);
scm_define (sym_null, PTR2SCM (&null_pointer));
null_pointer = scm_cell (scm_tc7_foreign | (SCM_FOREIGN_TYPE_VOID << 8UL),
0);
scm_define (sym_null, null_pointer);
}
void