X-Git-Url: http://git.annexia.org/?a=blobdiff_plain;f=perl_c.c;h=3214e34bf8653eff826c664f7f71949ee9db1427;hb=efab5abed48d08e735c652c8454d14393c006c0e;hp=53365b3cde02d08220e77a315fa13f739ef674f9;hpb=16900866ff592a4c28e84579b28dd20efedd8613;p=perl4caml.git

diff --git a/perl_c.c b/perl_c.c
index 53365b3..3214e34 100644
--- a/perl_c.c
+++ b/perl_c.c
@@ -1,6 +1,6 @@
 /* Interface to Perl from OCaml.
  * Copyright (C) 2003 Merjis Ltd.
- * $Id: perl_c.c,v 1.1 2003-10-11 18:25:52 rich Exp $
+ * $Id: perl_c.c,v 1.14 2004-02-03 12:38:57 rich Exp $
  */
 
 #include <stdio.h>
@@ -11,6 +11,7 @@
 
 #include <caml/alloc.h>
 #include <caml/callback.h>
+#include <caml/custom.h>
 #include <caml/fail.h>
 #include <caml/memory.h>
 #include <caml/mlvalues.h>
@@ -20,83 +21,74 @@
  */
 #define off64_t __off64_t
 
+/* XXX This is required by Perl >= 5.8.2. */
+#define __USE_GNU
+#include <crypt.h>
+
 #include <EXTERN.h>
 #include <perl.h>
 
 /* Perl requires the interpreter to be called literally 'my_perl'! */
 static PerlInterpreter *my_perl;
 
+/* Get the concrete value from an optional field. */
+static value unoption (value option, value deflt);
+
 /* Wrap up an arbitrary void pointer in an opaque OCaml object. */
 static value Val_voidptr (void *ptr);
 
 /* Unwrap an arbitrary void pointer from an opaque OCaml object. */
 #define Voidptr_val(type,rv) ((type *) Field ((rv), 0))
 
-/* Hide Perl types in opaque OCaml objects. */
-#define Val_perl(pl) (Val_voidptr ((pl)))
-#define Perl_val(plv) (Voidptr_val (PerlInterpreter, (plv)))
-#define Val_sv(sv) (Val_voidptr ((sv)))
-#define Sv_val(svv) (Voidptr_val (SV, (svv)))
+#if PERL4CAML_REFCOUNTING_EXPERIMENTAL
 
-CAMLprim value
-perl4caml_init (value unit)
-{
-  PERL_SYS_INIT3 (NULL, NULL, NULL);
-  return Val_unit;
-}
+/* Unwrap a custom block. */
+#define Xv_val(rv) (*((void **)Data_custom_val(rv)))
 
-CAMLprim value
-perl4caml_create (value optargs, value unit)
-{
-  CAMLparam2 (optargs, unit);
-  CAMLlocal1 (args);
-  int argc, i;
-  char **argv;
-  static char *no_args[] = { "", "-e", "0" };
+/* Wrap up an SV, AV or HV in a custom OCaml object which will decrement
+ * the reference count on finalization.
+ */
+static value Val_xv (SV *sv);
 
-  /* Arguments given? */
-  if (optargs == Val_int (0))	/* "None" */
-    {
-      argc = 3;
-      argv = no_args;
-    }
-  else				/* "Some args" where args is a string array. */
-    {
-      args = Field (optargs, 0);
-      argc = Wosize_val (args);
-      argv = alloca (argc * sizeof (char *));
-      for (i = 0; i < argc; ++i) argv[i] = String_val (Field (args, i));
-    }
+#else
 
-  my_perl = perl_alloc ();
-  perl_construct (my_perl);
-  PL_exit_flags |= PERL_EXIT_DESTRUCT_END;
-  perl_parse (my_perl, NULL, argc, argv, NULL);
-  perl_run (my_perl);
+#define Xv_val(rv) Voidptr_val (SV, (rv))
+#define Val_xv(sv) Val_voidptr ((sv))
 
-  CAMLreturn (Val_perl (my_perl));
-}
+#endif
 
-CAMLprim value
-perl4caml_destroy (value plv)
-{
-  CAMLparam1 (plv);
-  PerlInterpreter *pl = Perl_val (plv);
+/* Hide Perl types in opaque OCaml objects. */
+#define Val_perl(pl) (Val_voidptr ((pl)))
+#define Perl_val(plv) (Voidptr_val (PerlInterpreter, (plv)))
+#define Val_sv(sv) (Val_xv ((sv)))
+#define Sv_val(svv) ((SV *) Xv_val (svv))
+#define Val_av(av) (Val_xv ((SV *)(av)))
+#define Av_val(avv) ((AV *) Xv_val (avv))
+#define Val_hv(hv) (Val_xv ((SV *)(hv)))
+#define Hv_val(hvv) ((HV *) Xv_val (hvv))
 
-  perl_destruct (pl);
-  perl_free (pl);
+static void
+xs_init (pTHX)
+{
+  char *file = __FILE__;
+  EXTERN_C void boot_DynaLoader (pTHX_ CV* cv);
 
-  CAMLreturn (Val_unit);
+  newXS("DynaLoader::boot_DynaLoader", boot_DynaLoader, file);
 }
 
 CAMLprim value
-perl4caml_set_context (value plv)
+perl4caml_init (value unit)
 {
-  CAMLparam1 (plv);
-  PerlInterpreter *pl = Perl_val (plv);
+  CAMLparam1 (unit);
+  int argc = 4;
+  static char *argv[] = { "", "-w", "-e", "0" };
 
-  PERL_SET_CONTEXT (pl);
-  my_perl = pl;
+  PERL_SYS_INIT3 (NULL, NULL, NULL);
+  my_perl = perl_alloc ();
+  perl_construct (my_perl);
+  PL_exit_flags |= PERL_EXIT_DESTRUCT_END;
+  perl_parse (my_perl, xs_init, argc, argv, NULL);
+  /*perl_run (my_perl);*/
 
   CAMLreturn (Val_unit);
 }
@@ -155,57 +147,946 @@ perl4caml_sv_of_string (value strv)
 }
 
 CAMLprim value
-perl4caml_call_scalar (value fnname, value arglist)
+perl4caml_sv_is_true (value svv)
+{
+  CAMLparam1 (svv);
+  SV *sv = Sv_val (svv);
+  CAMLreturn (SvTRUE (sv) ? Val_true : Val_false);
+}
+
+CAMLprim value
+perl4caml_sv_undef (value unit)
+{
+  CAMLparam1 (unit);
+  CAMLreturn (Val_sv (newSV (0)));
+}
+
+CAMLprim value
+perl4caml_sv_yes (value unit)
+{
+  CAMLparam1 (unit);
+  CAMLreturn (Val_sv (&PL_sv_yes));
+}
+
+CAMLprim value
+perl4caml_sv_no (value unit)
+{
+  CAMLparam1 (unit);
+  CAMLreturn (Val_sv (&PL_sv_no));
+}
+
+CAMLprim value
+perl4caml_sv_type (value svv)
+{
+  CAMLparam1 (svv);
+  SV *sv = Sv_val (svv);
+
+  switch (SvTYPE (sv))
+    {
+    case SVt_IV: CAMLreturn (Val_int (1));
+    case SVt_NV: CAMLreturn (Val_int (2));
+    case SVt_PV: CAMLreturn (Val_int (3));
+    case SVt_RV: CAMLreturn (Val_int (4));
+    case SVt_PVAV: CAMLreturn (Val_int (5));
+    case SVt_PVHV: CAMLreturn (Val_int (6));
+    case SVt_PVCV: CAMLreturn (Val_int (7));
+    case SVt_PVGV: CAMLreturn (Val_int (8));
+    case SVt_PVMG: CAMLreturn (Val_int (9));
+    default: CAMLreturn (Val_int (0));
+    }
+}
+
+CAMLprim value
+perl4caml_scalarref (value svv)
+{
+  CAMLparam1 (svv);
+  CAMLlocal1 (rsvv);
+  SV *sv = Sv_val (svv);
+  rsvv = Val_sv (newRV_inc (sv));
+  CAMLreturn (rsvv);
+}
+
+CAMLprim value
+perl4caml_arrayref (value avv)
+{
+  CAMLparam1 (avv);
+  CAMLlocal1 (rsvv);
+  AV *av = Av_val (avv);
+  rsvv = Val_sv (newRV_inc ((SV *) av));
+  CAMLreturn (rsvv);
+}
+
+CAMLprim value
+perl4caml_hashref (value hvv)
+{
+  CAMLparam1 (hvv);
+  CAMLlocal1 (rsvv);
+  HV *hv = Hv_val (hvv);
+  rsvv = Val_sv (newRV_inc ((SV *) hv));
+  CAMLreturn (rsvv);
+}
+
+CAMLprim value
+perl4caml_deref (value svv)
+{
+  CAMLparam1 (svv);
+  CAMLlocal1 (rsvv);
+  SV *sv = Sv_val (svv);
+
+  if (SvTYPE (sv) != SVt_RV)
+    invalid_argument ("deref: SV is not a reference");
+  switch (SvTYPE (SvRV (sv))) {
+  case SVt_IV:
+  case SVt_NV:
+  case SVt_PV:
+  case SVt_RV:
+  case SVt_PVMG:
+    break;
+  default:
+    invalid_argument ("deref: SV is not a reference to a scalar");
+  }
+  rsvv = Val_sv (SvRV (sv));
+  CAMLreturn (rsvv);
+}
+
+CAMLprim value
+perl4caml_deref_array (value svv)
+{
+  CAMLparam1 (svv);
+  CAMLlocal1 (ravv);
+  SV *sv = Sv_val (svv);
+
+  if (SvTYPE (sv) != SVt_RV)
+    invalid_argument ("deref_array: SV is not a reference");
+  switch (SvTYPE (SvRV (sv))) {
+  case SVt_PVAV:
+    break;
+  default:
+    invalid_argument ("deref_array: SV is not a reference to an array");
+  }
+  ravv = Val_av ((AV *) SvRV (sv));
+  CAMLreturn (ravv);
+}
+
+CAMLprim value
+perl4caml_deref_hash (value svv)
+{
+  CAMLparam1 (svv);
+  CAMLlocal1 (rhvv);
+  SV *sv = Sv_val (svv);
+
+  if (SvTYPE (sv) != SVt_RV)
+    invalid_argument ("deref_array: SV is not a reference");
+  switch (SvTYPE (SvRV (sv))) {
+  case SVt_PVHV:
+    break;
+  default:
+    invalid_argument ("deref_array: SV is not a reference to a hash");
+  }
+  rhvv = Val_hv ((HV *) SvRV (sv));
+  CAMLreturn (rhvv);
+}
+
+CAMLprim value
+perl4caml_av_empty (value unit)
+{
+  CAMLparam1 (unit);
+  AV *av = newAV ();
+  CAMLreturn (Val_av (av));
+}
+
+/* We don't know in advance how long the list will be, which makes this
+ * a little harder.
+ */
+CAMLprim value
+perl4caml_av_of_sv_list (value svlistv)
+{
+  CAMLparam1 (svlistv);
+  CAMLlocal1 (svv);
+  SV *sv, **svlist = 0;
+  int alloc = 0, size = 0;
+  AV *av;
+
+  for (; svlistv != Val_int (0); svlistv = Field (svlistv, 1))
+    {
+      svv = Field (svlistv, 0);
+      sv = Sv_val (svv);
+      if (size >= alloc) {
+	alloc = alloc == 0 ? 1 : alloc * 2;
+	svlist = realloc (svlist, alloc * sizeof (SV *));
+      }
+      svlist[size++] = sv;
+    }
+
+  av = av_make (size, svlist);
+
+  if (alloc > 0) free (svlist);	/* Free memory allocated to SV list. */
+
+  CAMLreturn (Val_av (av));
+}
+
+/* XXX av_map would be faster if we also had sv_list_of_av. */
+
+CAMLprim value
+perl4caml_av_push (value avv, value svv)
+{
+  CAMLparam2 (avv, svv);
+  AV *av = Av_val (avv);
+  SV *sv = Sv_val (svv);
+  av_push (av, sv);
+  CAMLreturn (Val_unit);
+}
+
+CAMLprim value
+perl4caml_av_pop (value avv)
+{
+  CAMLparam1 (avv);
+  AV *av = Av_val (avv);
+  SV *sv = av_pop (av);
+  CAMLreturn (Val_sv (sv));
+}
+
+CAMLprim value
+perl4caml_av_unshift (value avv, value svv)
+{
+  CAMLparam2 (avv, svv);
+  AV *av = Av_val (avv);
+  SV *sv = Sv_val (svv);
+  av_unshift (av, 1);
+  SvREFCNT_inc (sv);
+  if (av_store (av, 0, sv) == 0)
+    SvREFCNT_dec (sv);
+  CAMLreturn (Val_unit);
+}
+
+CAMLprim value
+perl4caml_av_shift (value avv)
+{
+  CAMLparam1 (avv);
+  AV *av = Av_val (avv);
+  SV *sv = av_shift (av);
+  CAMLreturn (Val_sv (sv));
+}
+
+CAMLprim value
+perl4caml_av_length (value avv)
+{
+  CAMLparam1 (avv);
+  AV *av = Av_val (avv);
+  CAMLreturn (Val_int (av_len (av) + 1));
+}
+
+CAMLprim value
+perl4caml_av_set (value avv, value i, value svv)
+{
+  CAMLparam3 (avv, i, svv);
+  AV *av = Av_val (avv);
+  SV *sv = Sv_val (svv);
+  SvREFCNT_inc (sv);
+  if (av_store (av, Int_val (i), sv) == 0)
+    SvREFCNT_dec (sv);
+  CAMLreturn (Val_unit);
+}
+
+CAMLprim value
+perl4caml_av_get (value avv, value i)
+{
+  CAMLparam2 (avv, i);
+  AV *av = Av_val (avv);
+  SV **svp = av_fetch (av, Int_val (i), 0);
+  if (svp == 0) invalid_argument ("av_get: index out of bounds");
+  CAMLreturn (Val_sv (*svp));
+}
+
+CAMLprim value
+perl4caml_av_clear (value avv)
+{
+  CAMLparam1 (avv);
+  AV *av = Av_val (avv);
+  av_clear (av);
+  CAMLreturn (Val_unit);
+}
+
+CAMLprim value
+perl4caml_av_undef (value avv)
+{
+  CAMLparam1 (avv);
+  AV *av = Av_val (avv);
+  av_undef (av);
+  CAMLreturn (Val_unit);
+}
+
+CAMLprim value
+perl4caml_av_extend (value avv, value i)
+{
+  CAMLparam2 (avv, i);
+  AV *av = Av_val (avv);
+  av_extend (av, Int_val (i));
+  CAMLreturn (Val_unit);
+}
+
+CAMLprim value
+perl4caml_hv_empty (value unit)
+{
+  CAMLparam1 (unit);
+  HV *hv = newHV ();
+  CAMLreturn (Val_hv (hv));
+}
+
+CAMLprim value
+perl4caml_hv_set (value hvv, value key, value svv)
+{
+  CAMLparam3 (hvv, key, svv);
+  HV *hv = Hv_val (hvv);
+  SV *sv = Sv_val (svv);
+  SvREFCNT_inc (sv);
+  if (hv_store (hv, String_val (key), string_length (key), sv, 0) == 0)
+    SvREFCNT_dec (sv);
+  CAMLreturn (Val_unit);
+}
+
+CAMLprim value
+perl4caml_hv_get (value hvv, value key)
+{
+  CAMLparam2 (hvv, key);
+  HV *hv = Hv_val (hvv);
+  SV **svp = hv_fetch (hv, String_val (key), string_length (key), 0);
+  if (svp == 0) raise_not_found ();
+  CAMLreturn (Val_sv (*svp));
+}
+
+CAMLprim value
+perl4caml_hv_exists (value hvv, value key)
+{
+  CAMLparam2 (hvv, key);
+  HV *hv = Hv_val (hvv);
+  bool r = hv_exists (hv, String_val (key), string_length (key));
+  CAMLreturn (r ? Val_true : Val_false);
+}
+
+CAMLprim value
+perl4caml_hv_delete (value hvv, value key)
+{
+  CAMLparam2 (hvv, key);
+  HV *hv = Hv_val (hvv);
+  hv_delete (hv, String_val (key), string_length (key), G_DISCARD);
+  CAMLreturn (Val_unit);
+}
+
+CAMLprim value
+perl4caml_hv_clear (value hvv)
+{
+  CAMLparam1 (hvv);
+  HV *hv = Hv_val (hvv);
+  hv_clear (hv);
+  CAMLreturn (Val_unit);
+}
+
+CAMLprim value
+perl4caml_hv_undef (value hvv)
+{
+  CAMLparam1 (hvv);
+  HV *hv = Hv_val (hvv);
+  hv_undef (hv);
+  CAMLreturn (Val_unit);
+}
+
+CAMLprim value
+perl4caml_get_sv (value optcreate, value name)
+{
+  CAMLparam2 (optcreate, name);
+  CAMLlocal1 (create);
+  SV *sv;
+
+  create = unoption (optcreate, Val_false);
+  sv = get_sv (String_val (name), create == Val_true ? TRUE : FALSE);
+  if (sv == NULL) raise_not_found ();
+
+  CAMLreturn (Val_sv (sv));
+}
+
+CAMLprim value
+perl4caml_get_av (value optcreate, value name)
+{
+  CAMLparam2 (optcreate, name);
+  CAMLlocal1 (create);
+  AV *av;
+
+  create = unoption (optcreate, Val_false);
+  av = get_av (String_val (name), create == Val_true ? TRUE : FALSE);
+  if (av == NULL) raise_not_found ();
+
+  CAMLreturn (Val_av (av));
+}
+
+CAMLprim value
+perl4caml_get_hv (value optcreate, value name)
+{
+  CAMLparam2 (optcreate, name);
+  CAMLlocal1 (create);
+  HV *hv;
+
+  create = unoption (optcreate, Val_false);
+  hv = get_hv (String_val (name), create == Val_true ? TRUE : FALSE);
+  if (hv == NULL) raise_not_found ();
+
+  CAMLreturn (Val_hv (hv));
+}
+
+static inline void
+check_perl_failure ()
+{
+  SV *errsv = get_sv ("@", TRUE);
+
+  if (SvTRUE (errsv))		/* Equivalent of $@ in Perl. */
+    {
+      CAMLlocal1 (errv);
+      STRLEN n_a;
+      const char *err = SvPV (errsv, n_a);
+
+      errv = copy_string (err);
+
+      raise_with_arg (*caml_named_value ("perl4caml_perl_failure"), errv);
+    }
+}
+
+CAMLprim value
+perl4caml_call (value optsv, value optfnname, value arglist)
 {
-  CAMLparam2 (fnname, arglist);
+  CAMLparam3 (optsv, optfnname, arglist);
   dSP;
   int count;
   SV *sv;
-  CAMLlocal2 (errv, svv);
+  CAMLlocal3 (errv, svv, fnname);
 
   ENTER;
   SAVETMPS;
 
   /* Push the parameter list. */
   PUSHMARK (SP);
-  /* XXX NOT IMPLEMENTED YET. */
+
+  /* Iteration over the linked list. */
+  for (; arglist != Val_int (0); arglist = Field (arglist, 1))
+    {
+      svv = Field (arglist, 0);
+      sv = Sv_val (svv);
+      XPUSHs (sv_2mortal (newSVsv (sv)));
+    }
+
   PUTBACK;
 
-  count = call_pv (String_val (fnname), G_EVAL|G_SCALAR);
+  if (optsv != Val_int (0))
+    {
+      svv = unoption (optsv, Val_false);
+      sv = Sv_val (svv);
+      count = call_sv (sv, G_EVAL|G_SCALAR);
+    }
+  else if (optfnname != Val_int (0))
+    {
+      fnname = unoption (optfnname, Val_false);
+      count = call_pv (String_val (fnname), G_EVAL|G_SCALAR);
+    }
+  else
+    {
+      fprintf (stderr,
+	       "Perl.call: must supply either 'sv' or 'fn' parameters.");
+      abort ();
+    }
 
   SPAGAIN;
 
   assert (count == 1); /* Pretty sure it should never be anything else. */
 
-  /* Pop return value off the stack and restore Perl stack. Note that the
-   * return value on the stack is mortal, so we need to take a copy.
+  /* Pop return value off the stack. Note that the return value on the
+   * stack is mortal, so we need to take a copy.
    */
   sv = newSVsv (POPs);
   PUTBACK;
   FREETMPS;
   LEAVE;
 
-  /* Died with an error? */
-  if (SvTRUE (ERRSV))
+  check_perl_failure ();
+
+  svv = Val_sv (sv);
+  CAMLreturn (svv);
+}
+
+CAMLprim value
+perl4caml_call_array (value optsv, value optfnname, value arglist)
+{
+  CAMLparam3 (optsv, optfnname, arglist);
+  dSP;
+  int i, count;
+  SV *sv;
+  CAMLlocal5 (errv, svv, fnname, list, cons);
+
+  ENTER;
+  SAVETMPS;
+
+  /* Push the parameter list. */
+  PUSHMARK (SP);
+
+  /* Iteration over the linked list. */
+  for (; arglist != Val_int (0); arglist = Field (arglist, 1))
     {
-      STRLEN n_a;
-      const char *err = SvPV (ERRSV, n_a); /* Equivalent of $@ in Perl. */
+      svv = Field (arglist, 0);
+      sv = Sv_val (svv);
+      XPUSHs (sv_2mortal (newSVsv (sv)));
+    }
 
-      errv = copy_string (err);
+  PUTBACK;
 
-      raise_with_arg (*caml_named_value ("perl4caml_perl_failure"), errv);
+  if (optsv != Val_int (0))
+    {
+      svv = unoption (optsv, Val_false);
+      sv = Sv_val (svv);
+      count = call_sv (sv, G_EVAL|G_ARRAY);
     }
-  else
+  else if (optfnname != Val_int (0))
     {
-      svv = Val_sv (sv);
-      CAMLreturn (svv);
+      fnname = unoption (optfnname, Val_false);
+      count = call_pv (String_val (fnname), G_EVAL|G_ARRAY);
     }
+  else
+    {
+      fprintf (stderr,
+	       "Perl.call_array: must supply either 'sv' or 'fn' parameters.");
+      abort ();
+    }
+
+  SPAGAIN;
+
+  /* Pop all the return values off the stack into a list. Values on the
+   * stack are mortal, so we must copy them.
+   */
+  list = Val_int (0);
+  for (i = 0; i < count; ++i) {
+    SV *sv;
+
+    cons = alloc (2, 0);
+    Field (cons, 1) = list;
+    list = cons;
+    sv = newSVsv (POPs);
+    Field (cons, 0) = Val_sv (sv);
+  }
+
+  /* Restore the stack. */
+  PUTBACK;
+  FREETMPS;
+  LEAVE;
+
+  check_perl_failure ();
+
+  CAMLreturn (list);
+}
+
+CAMLprim value
+perl4caml_call_void (value optsv, value optfnname, value arglist)
+{
+  CAMLparam3 (optsv, optfnname, arglist);
+  dSP;
+  int count;
+  SV *sv;
+  CAMLlocal3 (errv, svv, fnname);
+
+  ENTER;
+  SAVETMPS;
+
+  /* Push the parameter list. */
+  PUSHMARK (SP);
+
+  /* Iteration over the linked list. */
+  for (; arglist != Val_int (0); arglist = Field (arglist, 1))
+    {
+      svv = Field (arglist, 0);
+      sv = Sv_val (svv);
+      XPUSHs (sv_2mortal (newSVsv (sv)));
+    }
+
+  PUTBACK;
+
+  if (optsv != Val_int (0))
+    {
+      svv = unoption (optsv, Val_false);
+      sv = Sv_val (svv);
+      count = call_sv (sv, G_EVAL|G_VOID);
+    }
+  else if (optfnname != Val_int (0))
+    {
+      fnname = unoption (optfnname, Val_false);
+      count = call_pv (String_val (fnname), G_EVAL|G_VOID|G_DISCARD);
+    }
+  else
+    {
+      fprintf (stderr,
+	       "Perl.call_void: must supply either 'sv' or 'fn' parameters.");
+      abort ();
+    }
+
+  SPAGAIN;
+
+  assert (count == 0);
+
+  /* Restore the stack. */
+  PUTBACK;
+  FREETMPS;
+  LEAVE;
+
+  check_perl_failure ();
+
+  CAMLreturn (Val_unit);
+}
+
+CAMLprim value
+perl4caml_eval (value expr)
+{
+  CAMLparam1 (expr);
+  dSP;
+  SV *sv;
+  CAMLlocal2 (errv, svv);
+
+  sv = eval_pv (String_val (expr), G_SCALAR);
+
+  check_perl_failure ();
+
+  svv = Val_sv (sv);
+  CAMLreturn (svv);
+}
+
+CAMLprim value
+perl4caml_call_method (value ref, value name, value arglist)
+{
+  CAMLparam3 (ref, name, arglist);
+  dSP;
+  int count;
+  SV *sv;
+  CAMLlocal2 (errv, svv);
+
+  ENTER;
+  SAVETMPS;
+
+  /* Push the parameter list. */
+  PUSHMARK (SP);
+
+  sv = Sv_val (ref);
+  XPUSHs (sv_2mortal (newSVsv (sv)));
+
+  /* Iteration over the linked list. */
+  for (; arglist != Val_int (0); arglist = Field (arglist, 1))
+    {
+      svv = Field (arglist, 0);
+      sv = Sv_val (svv);
+      XPUSHs (sv_2mortal (newSVsv (sv)));
+    }
+
+  PUTBACK;
+
+  count = call_method (String_val (name), G_EVAL|G_SCALAR);
+
+  SPAGAIN;
+
+  assert (count == 1); /* Pretty sure it should never be anything else. */
+
+  /* Pop return value off the stack. Note that the return value on the
+   * stack is mortal, so we need to take a copy.
+   */
+  sv = newSVsv (POPs);
+  PUTBACK;
+  FREETMPS;
+  LEAVE;
+
+  check_perl_failure ();
+
+  svv = Val_sv (sv);
+  CAMLreturn (svv);
 }
 
-value
+CAMLprim value
+perl4caml_call_method_array (value ref, value name, value arglist)
+{
+  CAMLparam3 (ref, name, arglist);
+  dSP;
+  int count, i;
+  SV *sv;
+  CAMLlocal4 (errv, svv, list, cons);
+
+  ENTER;
+  SAVETMPS;
+
+  /* Push the parameter list. */
+  PUSHMARK (SP);
+
+  sv = Sv_val (ref);
+  XPUSHs (sv_2mortal (newSVsv (sv)));
+
+  /* Iteration over the linked list. */
+  for (; arglist != Val_int (0); arglist = Field (arglist, 1))
+    {
+      svv = Field (arglist, 0);
+      sv = Sv_val (svv);
+      XPUSHs (sv_2mortal (newSVsv (sv)));
+    }
+
+  PUTBACK;
+
+  count = call_method (String_val (name), G_EVAL|G_ARRAY);
+
+  SPAGAIN;
+
+  /* Pop all return values off the stack. Note that the return values on the
+   * stack are mortal, so we need to take a copy.
+   */
+  list = Val_int (0);
+  for (i = 0; i < count; ++i) {
+    SV *sv;
+
+    cons = alloc (2, 0);
+    Field (cons, 1) = list;
+    list = cons;
+    sv = newSVsv (POPs);
+    Field (cons, 0) = Val_sv (sv);
+  }
+
+  /* Restore the stack. */
+  PUTBACK;
+  FREETMPS;
+  LEAVE;
+
+  check_perl_failure ();
+
+  CAMLreturn (list);
+}
+
+CAMLprim value
+perl4caml_call_method_void (value ref, value name, value arglist)
+{
+  CAMLparam3 (ref, name, arglist);
+  dSP;
+  int count;
+  SV *sv;
+  CAMLlocal2 (errv, svv);
+
+  ENTER;
+  SAVETMPS;
+
+  /* Push the parameter list. */
+  PUSHMARK (SP);
+
+  sv = Sv_val (ref);
+  XPUSHs (sv_2mortal (newSVsv (sv)));
+
+  /* Iteration over the linked list. */
+  for (; arglist != Val_int (0); arglist = Field (arglist, 1))
+    {
+      svv = Field (arglist, 0);
+      sv = Sv_val (svv);
+      XPUSHs (sv_2mortal (newSVsv (sv)));
+    }
+
+  PUTBACK;
+
+  count = call_method (String_val (name), G_EVAL|G_VOID|G_DISCARD);
+
+  SPAGAIN;
+
+  assert (count == 0);
+
+  /* Restore the stack. */
+  PUTBACK;
+  FREETMPS;
+  LEAVE;
+
+  check_perl_failure ();
+
+  CAMLreturn (Val_unit);
+}
+
+CAMLprim value
+perl4caml_call_class_method (value classname, value name, value arglist)
+{
+  CAMLparam3 (classname, name, arglist);
+  dSP;
+  int count;
+  SV *sv;
+  CAMLlocal2 (errv, svv);
+
+  ENTER;
+  SAVETMPS;
+
+  /* Push the parameter list. */
+  PUSHMARK (SP);
+
+  XPUSHs (sv_2mortal (newSVpv (String_val (classname), 0)));
+
+  /* Iteration over the linked list. */
+  for (; arglist != Val_int (0); arglist = Field (arglist, 1))
+    {
+      svv = Field (arglist, 0);
+      sv = Sv_val (svv);
+      XPUSHs (sv_2mortal (newSVsv (sv)));
+    }
+
+  PUTBACK;
+
+  count = call_method (String_val (name), G_EVAL|G_SCALAR);
+
+  SPAGAIN;
+
+  assert (count == 1); /* Pretty sure it should never be anything else. */
+
+  /* Pop return value off the stack. Note that the return value on the
+   * stack is mortal, so we need to take a copy.
+   */
+  sv = newSVsv (POPs);
+  PUTBACK;
+  FREETMPS;
+  LEAVE;
+
+  check_perl_failure ();
+
+  svv = Val_sv (sv);
+  CAMLreturn (svv);
+}
+
+CAMLprim value
+perl4caml_call_class_method_array (value classname, value name, value arglist)
+{
+  CAMLparam3 (classname, name, arglist);
+  dSP;
+  int count, i;
+  SV *sv;
+  CAMLlocal4 (errv, svv, list, cons);
+
+  ENTER;
+  SAVETMPS;
+
+  /* Push the parameter list. */
+  PUSHMARK (SP);
+
+  XPUSHs (sv_2mortal (newSVpv (String_val (classname), 0)));
+
+  /* Iteration over the linked list. */
+  for (; arglist != Val_int (0); arglist = Field (arglist, 1))
+    {
+      svv = Field (arglist, 0);
+      sv = Sv_val (svv);
+      XPUSHs (sv_2mortal (newSVsv (sv)));
+    }
+
+  PUTBACK;
+
+  count = call_method (String_val (name), G_EVAL|G_ARRAY);
+
+  SPAGAIN;
+
+  /* Pop all return values off the stack. Note that the return values on the
+   * stack are mortal, so we need to take a copy.
+   */
+  list = Val_int (0);
+  for (i = 0; i < count; ++i) {
+    cons = alloc (2, 0);
+    Field (cons, 1) = list;
+    list = cons;
+    Field (cons, 0) = Val_sv (newSVsv (POPs));
+  }
+
+  /* Restore the stack. */
+  PUTBACK;
+  FREETMPS;
+  LEAVE;
+
+  check_perl_failure ();
+
+  CAMLreturn (list);
+}
+
+CAMLprim value
+perl4caml_call_class_method_void (value classname, value name, value arglist)
+{
+  CAMLparam3 (classname, name, arglist);
+  dSP;
+  int count;
+  SV *sv;
+  CAMLlocal2 (errv, svv);
+
+  ENTER;
+  SAVETMPS;
+
+  /* Push the parameter list. */
+  PUSHMARK (SP);
+
+  XPUSHs (sv_2mortal (newSVpv (String_val (classname), 0)));
+
+  /* Iteration over the linked list. */
+  for (; arglist != Val_int (0); arglist = Field (arglist, 1))
+    {
+      svv = Field (arglist, 0);
+      sv = Sv_val (svv);
+      XPUSHs (sv_2mortal (newSVsv (sv)));
+    }
+
+  PUTBACK;
+
+  count = call_method (String_val (name), G_EVAL|G_VOID|G_DISCARD);
+
+  SPAGAIN;
+
+  assert (count == 0);
+
+  /* Restore the stack. */
+  PUTBACK;
+  FREETMPS;
+  LEAVE;
+
+  check_perl_failure ();
+
+  CAMLreturn (Val_unit);
+}
+
+static value
 Val_voidptr (void *ptr)
 {
-  value rv = alloc (1, Abstract_tag); /* XXX Is this correct? */
+  CAMLparam0 ();
+  CAMLlocal1 (rv);
+  rv = alloc (1, Abstract_tag);
   Field(rv, 0) = (value) ptr;
-  return rv;
+  CAMLreturn (rv);
+}
+
+#if PERL4CAML_REFCOUNTING_EXPERIMENTAL
+
+static void
+xv_finalize (value v)
+{
+  SvREFCNT_dec ((SV *) Xv_val (v));
+}
+
+static struct custom_operations xv_custom_operations = {
+  "xv_custom_operations",
+  xv_finalize,
+  custom_compare_default,
+  custom_hash_default,
+  custom_serialize_default,
+  custom_deserialize_default
+};
+
+static value
+Val_xv (SV *sv)
+{
+  CAMLparam0 ();
+  CAMLlocal1 (rv);
+  rv = alloc_custom (&xv_custom_operations, sizeof (void *), 0, 1);
+  Xv_val (rv) = sv;
+  CAMLreturn (rv);
+}
+
+#endif /* PERL4CAML_REFCOUNTING_EXPERIMENTAL */
+
+static value
+unoption (value option, value deflt)
+{
+  if (option == Val_int (0))	/* "None" */
+    return deflt;
+  else				/* "Some 'a" */
+    return Field (option, 0);
 }