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add allocate-struct primitive and rtl opcode

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* libguile/struct.h:
* libguile/struct.c (scm_allocate_struct): New interface: allocates a
  struct.

* libguile/vm-engine.c (allocate_struct): Instead of make-struct with a
  rest arg, separate allocation from initialization.
This commit is contained in:
Andy Wingo 2013-07-21 16:17:59 +02:00
parent b21713128e
commit 14d102920f
3 changed files with 48 additions and 36 deletions
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36
libguile/struct.c
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@ -517,6 +517,42 @@ scm_c_make_struct (SCM vtable, size_t n_tail, size_t n_init, scm_t_bits init, ..
return scm_c_make_structv (vtable, n_tail, n_init, v);
}
SCM_DEFINE (scm_allocate_struct, "allocate-struct", 2, 0, 0,
(SCM vtable, SCM nfields),
"Allocate a new structure with space for @var{nfields} fields.\n\n"
"@var{vtable} must be a vtable structure (@pxref{Vtables}).\n\n"
"@var{nfields} must be a non-negative integer. Strictly speaking\n"
"@var{nfields} is redundant, as the vtable carries the size\n"
"for its instances. However passing it is useful as a sanity\n"
"check, given that one module can inline a constructor in\n"
"another.\n\n"
"Fields will be initialized with their default values.")
#define FUNC_NAME s_scm_allocate_struct
{
SCM ret;
size_t c_nfields;
SCM_VALIDATE_VTABLE (1, vtable);
c_nfields = scm_to_size_t (nfields);
SCM_ASSERT (SCM_STRUCT_DATA_REF (vtable, scm_vtable_index_size) == c_nfields,
nfields, 2, FUNC_NAME);
ret = scm_i_alloc_struct (SCM_STRUCT_DATA (vtable), c_nfields);
if (SCM_LIKELY (SCM_VTABLE_FLAG_IS_SET (vtable, SCM_VTABLE_FLAG_SIMPLE)))
{
size_t n;
for (n = 0; n < c_nfields; n++)
SCM_STRUCT_DATA_SET (ret, n, SCM_UNPACK (SCM_BOOL_F));
}
else
scm_struct_init (ret, SCM_VTABLE_LAYOUT (vtable), 0, 0, NULL);
return ret;
}
#undef FUNC_NAME
SCM_DEFINE (scm_make_struct, "make-struct", 2, 0, 1,
(SCM vtable, SCM tail_array_size, SCM init),
"Create a new structure.\n\n"