/* This takes a signature element and either runs the closure to get a default
* value if there is one, or creates an appropriate undefined-ish thingy. */
static PMC *
Rakudo_binding_handle_optional(PARROT_INTERP, llsig_element *sig_info, PMC *lexpad) {
PMC *cur_lex;
/* Is the "get default from outer" flag set? */
if (sig_info->flags & SIG_ELEM_DEFAULT_FROM_OUTER) {
PMC *outer_ctx = Parrot_pcc_get_outer_ctx(interp, CURRENT_CONTEXT(interp));
PMC *outer_lexpad = Parrot_pcc_get_lex_pad(interp, outer_ctx);
return VTABLE_get_pmc_keyed_str(interp, outer_lexpad, sig_info->variable_name);
}
/* Do we have a default value closure? */
else if (!PMC_IS_NULL(sig_info->default_closure)) {
/* Run it to get a value. */
PMC *result = PMCNULL;
Parrot_sub_capture_lex(interp, sig_info->default_closure);
Parrot_ext_call(interp, sig_info->default_closure, "->P", &result);
return result;
}
/* Did the value already get initialized to something? (We can avoid re-creating a
* PMC if so.) */
else if (!PMC_IS_NULL(cur_lex = VTABLE_get_pmc_keyed_str(interp, lexpad, sig_info->variable_name))) {
/* Yes; if $ sigil then we want to bind set value in it to be the
* type object of the default type. */
if (!(sig_info->flags & (SIG_ELEM_ARRAY_SIGIL | SIG_ELEM_HASH_SIGIL)))
VTABLE_set_pmc(interp, cur_lex, sig_info->nominal_type);
return cur_lex;
}
/* Otherwise, go by sigil to pick the correct default type of value. */
else {
if (sig_info->flags & SIG_ELEM_ARRAY_SIGIL) {
return Rakudo_binding_create_positional(interp, PMCNULL, ARRAY_str);
}
else if (sig_info->flags & SIG_ELEM_HASH_SIGIL) {
return Rakudo_binding_create_hash(interp, pmc_new(interp, enum_class_Hash));
}
else {
return pmc_new_init(interp, pmc_type(interp, P6_SCALAR_str),
sig_info->nominal_type);
}
}
}
/* This takes a signature element and either runs the closure to get a default
* value if there is one, or creates an appropriate undefined-ish thingy. */
static PMC *
Rakudo_binding_handle_optional(PARROT_INTERP, Rakudo_Parameter *param, PMC *lexpad) {
PMC *cur_lex;
/* Is the "get default from outer" flag set? */
if (param->flags & SIG_ELEM_DEFAULT_FROM_OUTER) {
PMC *outer_ctx = Parrot_pcc_get_outer_ctx(interp, CURRENT_CONTEXT(interp));
PMC *outer_lexpad = Parrot_pcc_get_lex_pad(interp, outer_ctx);
return VTABLE_get_pmc_keyed_str(interp, outer_lexpad, param->variable_name);
}
/* Do we have a default value or value closure? */
else if (!PMC_IS_NULL(param->default_value)) {
if (param->flags & SIG_ELEM_DEFAULT_IS_LITERAL) {
return param->default_value;
}
else {
/* Thunk; run it to get a value. */
PMC *old_ctx = Parrot_pcc_get_signature(interp, CURRENT_CONTEXT(interp));
PMC *cappy = Parrot_pmc_new(interp, enum_class_CallContext);
Parrot_pcc_invoke_from_sig_object(interp, param->default_value, cappy);
cappy = Parrot_pcc_get_signature(interp, CURRENT_CONTEXT(interp));
Parrot_pcc_set_signature(interp, CURRENT_CONTEXT(interp), old_ctx);
return VTABLE_get_pmc_keyed_int(interp, cappy, 0);
}
}
/* Otherwise, go by sigil to pick the correct default type of value. */
else {
if (param->flags & SIG_ELEM_ARRAY_SIGIL) {
return Rakudo_binding_create_positional(interp, PMCNULL);
}
else if (param->flags & SIG_ELEM_HASH_SIGIL) {
return Rakudo_binding_create_hash(interp, Parrot_pmc_new(interp, enum_class_Hash));
}
else {
return param->nominal_type;
}
}
}
/* Binds a single argument into the lexpad, after doing any checks that are
* needed. Also handles any type captures. If there is a sub signature, then
* re-enters the binder. Returns one of the BIND_RESULT_* codes. */
static INTVAL
Rakudo_binding_bind_one_param(PARROT_INTERP, PMC *lexpad, PMC *llsig, llsig_element *sig_info,
PMC *value, INTVAL no_nom_type_check, STRING **error) {
/* If we need to do a type check, do one. */
if (!no_nom_type_check) {
/* See if we get a hit in the type cache. */
INTVAL cache_matched = 0;
INTVAL value_type = VTABLE_type(interp, value);
if (value_type != 0) {
INTVAL i;
for (i = 0; i < NOM_TYPE_CACHE_SIZE; i++) {
if (sig_info->nom_type_cache[i] == value_type)
{
cache_matched = 1;
break;
}
}
}
/* If not, do the check. */
if (!cache_matched) {
PMC * const type_obj = sig_info->nominal_type;
PMC * accepts_meth = VTABLE_find_method(interp, type_obj, ACCEPTS);
PMC * result = PMCNULL;
Parrot_ext_call(interp, accepts_meth, "PiP->P", type_obj, value, &result);
if (VTABLE_get_bool(interp, result)) {
/* Cache if possible. */
if (value_type != 0 && value_type != p6r_id && value_type != p6o_id) {
INTVAL i;
for (i = 0; i < NOM_TYPE_CACHE_SIZE; i++) {
if (sig_info->nom_type_cache[i] == 0)
{
sig_info->nom_type_cache[i] = value_type;
PARROT_GC_WRITE_BARRIER(interp, llsig);
break;
}
}
}
}
else {
/* Type check failed. However, for language inter-op, we do some
* extra checks if the type is just Positional, Associative, or
* Callable and the thingy we have matches those enough. */
/* XXX TODO: Implement language interop checks. */
if (error) {
STRING * const perl = PERL_str;
PMC * perl_meth = VTABLE_find_method(interp, type_obj, perl);
PMC * how_meth = VTABLE_find_method(interp, value, HOW);
STRING * expected, * got;
PMC * value_how, * value_type;
Parrot_ext_call(interp, perl_meth, "Pi->S", type_obj, &expected);
Parrot_ext_call(interp, how_meth, "Pi->P", value, &value_how);
value_type = VTABLE_get_attr_str(interp, value_how, SHORTNAME_str);
got = VTABLE_get_string(interp, value_type);
*error = Parrot_sprintf_c(interp, "Nominal type check failed for parameter '%S'; expected %S but got %S instead",
sig_info->variable_name, expected, got);
}
if (VTABLE_isa(interp, value, JUNCTION_str))
return BIND_RESULT_JUNCTION;
else
return BIND_RESULT_FAIL;
}
}
}
/* Do we have any type captures to bind? */
if (!PMC_IS_NULL(sig_info->type_captures))
Rakudo_binding_bind_type_captures(interp, lexpad, sig_info, value);
/* Do a coercion, if one is needed. */
if (!STRING_IS_NULL(sig_info->coerce_to)) {
PMC *coerce_meth = VTABLE_find_method(interp, value, sig_info->coerce_to);
if (!PMC_IS_NULL(coerce_meth)) {
Parrot_ext_call(interp, coerce_meth, "Pi->P", value, &value);
}
else {
/* No coercion method availale; whine and fail to bind. */
if (error) {
PMC * how_meth = VTABLE_find_method(interp, value, HOW);
PMC * value_how, * value_type;
STRING * got;
Parrot_ext_call(interp, how_meth, "Pi->P", value, &value_how);
value_type = VTABLE_get_attr_str(interp, value_how, SHORTNAME_str);
got = VTABLE_get_string(interp, value_type);
*error = Parrot_sprintf_c(interp,
"Unable to coerce value for '%S' from %S to %S; no coercion method defined",
sig_info->variable_name, got, sig_info->coerce_to);
}
return BIND_RESULT_FAIL;
}
}
/* If it's not got attributive binding, we'll go about binding it into the
* lex pad. */
if (!(sig_info->flags & SIG_ELEM_BIND_ATTRIBUTIVE)) {
/* Is it "is rw"? */
if (sig_info->flags & SIG_ELEM_IS_RW) {
/* XXX TODO Check if rw flag is set. */
if (!STRING_IS_NULL(sig_info->variable_name))
VTABLE_set_pmc_keyed_str(interp, lexpad, sig_info->variable_name, value);
}
else if (sig_info->flags & SIG_ELEM_IS_PARCEL) {
/* Just bind the thing as is into the lexpad. */
if (!STRING_IS_NULL(sig_info->variable_name))
VTABLE_set_pmc_keyed_str(interp, lexpad, sig_info->variable_name, value);
}
else if (sig_info->flags & SIG_ELEM_IS_COPY) {
/* Place the value into a new container instead of binding to an existing one */
value = descalarref(interp, value);
if (!STRING_IS_NULL(sig_info->variable_name)) {
PMC *copy, *ref, *store_meth;
if (sig_info->flags & SIG_ELEM_ARRAY_SIGIL) {
copy = Rakudo_binding_create_positional(interp, PMCNULL, ARRAY_str);
store_meth = VTABLE_find_method(interp, copy, STORE_str);
Parrot_ext_call(interp, store_meth, "PiP", copy, value);
}
else if (sig_info->flags & SIG_ELEM_HASH_SIGIL) {
copy = Rakudo_binding_create_hash(interp, pmc_new(interp, enum_class_Hash));
store_meth = VTABLE_find_method(interp, copy, STORE_str);
Parrot_ext_call(interp, store_meth, "PiP", copy, value);
}
else {
copy = pmc_new_init(interp, p6s_id, value);
VTABLE_setprop(interp, copy, SCALAR_str, copy);
}
VTABLE_setprop(interp, copy, RW_str, copy);
VTABLE_set_pmc_keyed_str(interp, lexpad, sig_info->variable_name, copy);
}
}
else {
/* Read only. Wrap it into a ObjectRef, mark readonly and bind it. */
if (!STRING_IS_NULL(sig_info->variable_name)) {
PMC *ref = pmc_new_init(interp, or_id, value);
if (!(sig_info->flags & (SIG_ELEM_ARRAY_SIGIL | SIG_ELEM_HASH_SIGIL)))
VTABLE_setprop(interp, ref, SCALAR_str, ref);
VTABLE_set_pmc_keyed_str(interp, lexpad, sig_info->variable_name, ref);
}
}
}
/* Is it the invocant? If so, also have to bind to self lexical. */
if (sig_info->flags & SIG_ELEM_INVOCANT)
VTABLE_set_pmc_keyed_str(interp, lexpad, SELF_str, value);
/* Handle any constraint types (note that they may refer to the parameter by
* name, so we need to have bound it already). */
if (!PMC_IS_NULL(sig_info->post_constraints)) {
PMC * const constraints = sig_info->post_constraints;
INTVAL num_constraints = VTABLE_elements(interp, constraints);
PMC * result = PMCNULL;
INTVAL i;
for (i = 0; i < num_constraints; i++) {
PMC *cons_type = VTABLE_get_pmc_keyed_int(interp, constraints, i);
PMC *accepts_meth = VTABLE_find_method(interp, cons_type, ACCEPTS);
if (VTABLE_isa(interp, cons_type, BLOCK_str))
Parrot_sub_capture_lex(interp,
VTABLE_get_attr_str(interp, cons_type, DO_str));
Parrot_ext_call(interp, accepts_meth, "PiP->P", cons_type, value, &result);
if (!VTABLE_get_bool(interp, result)) {
if (error)
*error = Parrot_sprintf_c(interp, "Constraint type check failed for parameter '%S'",
sig_info->variable_name);
return BIND_RESULT_FAIL;
}
}
}
/* If it's attributive, now we assign it. */
if (sig_info->flags & SIG_ELEM_BIND_ATTRIBUTIVE) {
INTVAL result = Rakudo_binding_assign_attributive(interp, lexpad, sig_info, value, error);
if (result != BIND_RESULT_OK)
return result;
}
/* If it has a sub-signature, bind that. */
if (!PMC_IS_NULL(sig_info->sub_llsig)) {
/* Turn value into a capture, unless we already have one. */
PMC *capture = PMCNULL;
INTVAL result;
if (sig_info->flags & SIG_ELEM_IS_CAPTURE) {
capture = value;
}
else {
PMC *meth = VTABLE_find_method(interp, value, Parrot_str_new(interp, "Capture", 0));
if (PMC_IS_NULL(meth)) {
if (error)
*error = Parrot_sprintf_c(interp, "Could not turn argument into capture");
return BIND_RESULT_FAIL;
}
Parrot_ext_call(interp, meth, "Pi->P", value, &capture);
}
/* Recurse into signature binder. */
result = Rakudo_binding_bind_llsig(interp, lexpad, sig_info->sub_llsig,
capture, no_nom_type_check, error);
if (result != BIND_RESULT_OK)
{
if (error) {
/* Note in the error message that we're in a sub-signature. */
*error = Parrot_str_concat(interp, *error,
Parrot_str_new(interp, " in sub-signature", 0));
/* Have we a variable name? */
if (!STRING_IS_NULL(sig_info->variable_name)) {
*error = Parrot_str_concat(interp, *error,
Parrot_str_new(interp, " of parameter ", 0));
*error = Parrot_str_concat(interp, *error, sig_info->variable_name);
}
}
return result;
}
}
/* Binding of this parameter was thus successful - we're done. */
return BIND_RESULT_OK;
}
/* Takes a signature along with positional and named arguments and binds them
* into the provided lexpad (actually, anything that has a Hash interface will
* do). Returns BIND_RESULT_OK if binding works out, BIND_RESULT_FAIL if there
* is a failure and BIND_RESULT_JUNCTION if the failure was because of a
* Junction being passed (meaning we need to auto-thread). */
INTVAL
Rakudo_binding_bind(PARROT_INTERP, PMC *lexpad, PMC *sig_pmc, PMC *capture,
INTVAL no_nom_type_check, STRING **error) {
INTVAL i, num_pos_args;
INTVAL bind_fail = 0;
INTVAL cur_pos_arg = 0;
Rakudo_Signature *sig = (Rakudo_Signature *)PMC_data(sig_pmc);
PMC *params = sig->params;
INTVAL num_params = VTABLE_elements(interp, params);
Rakudo_BindVal cur_bv;
/* If we do have some named args, we want to make a clone of the hash
* to work on. We'll delete stuff from it as we bind, and what we have
* left over can become the slurpy hash or - if we aren't meant to be
* taking one - tell us we have a problem. */
PMC *named_args_copy = PMCNULL;
/* If we have a |$foo that's followed by slurpies, then we can suppress
* any future arity checks. */
INTVAL suppress_arity_fail = 0;
/* If it's a Parrot capture, it may contain natively typed arguments.
* NOTE: This is a really an encapsulation breakage; if Parrot folks
* change stuff and this breaks, it's not Parrot's fault. */
struct Pcc_cell * pc_positionals = NULL;
/* Set up statics. */
if (!smo_id)
setup_binder_statics(interp);
/* If we've got a CallContext, just has an attribute with list of named
* parameter names. Otherwise, it's probably a Perl 6 Capture and we need
* to extract its parts. */
if (capture->vtable->base_type == enum_class_CallContext) {
PMC *named_names = VTABLE_get_attr_str(interp, capture, NAMED_str);
if (!PMC_IS_NULL(named_names)) {
PMC *iter = VTABLE_get_iter(interp, named_names);
named_args_copy = Parrot_pmc_new(interp, enum_class_Hash);
while (VTABLE_get_bool(interp, iter)) {
STRING *name = VTABLE_shift_string(interp, iter);
VTABLE_set_pmc_keyed_str(interp, named_args_copy, name,
VTABLE_get_pmc_keyed_str(interp, capture, name));
}
}
GETATTR_CallContext_positionals(interp, capture, pc_positionals);
}
else if (capture->vtable->base_type == smo_id &&
STABLE(capture)->type_check(interp, capture, Rakudo_types_capture_get())) {
PMC *captype = Rakudo_types_capture_get();
PMC *list_part = VTABLE_get_attr_keyed(interp, capture, captype, LIST_str);
PMC *hash_part = VTABLE_get_attr_keyed(interp, capture, captype, HASH_str);
capture = Rakudo_isnqplist(list_part)
? list_part
: Parrot_pmc_new(interp, enum_class_ResizablePMCArray);
if (hash_part->vtable->base_type == enum_class_Hash) {
PMC *iter = VTABLE_get_iter(interp, hash_part);
named_args_copy = Parrot_pmc_new(interp, enum_class_Hash);
while (VTABLE_get_bool(interp, iter)) {
STRING *arg_copy_name = VTABLE_shift_string(interp, iter);
VTABLE_set_pmc_keyed_str(interp, named_args_copy, arg_copy_name,
VTABLE_get_pmc_keyed_str(interp, hash_part, arg_copy_name));
}
}
}
else {
Parrot_ex_throw_from_c_args(interp, NULL, EXCEPTION_INVALID_OPERATION,
"Internal Error: Rakudo_binding_bind passed invalid Capture");
}
/* Now we'll walk through the signature and go about binding things. */
num_pos_args = VTABLE_elements(interp, capture);
for (i = 0; i < num_params; i++) {
Rakudo_Parameter *param = (Rakudo_Parameter *)PMC_data(
VTABLE_get_pmc_keyed_int(interp, params, i));
/* Is it looking for us to bind a capture here? */
if (param->flags & SIG_ELEM_IS_CAPTURE) {
/* Capture the arguments from this point forwards into a Capture.
* Of course, if there's no variable name we can (cheaply) do pretty
* much nothing. */
if (STRING_IS_NULL(param->variable_name)) {
bind_fail = BIND_RESULT_OK;
}
else {
PMC *captype = Rakudo_types_capture_get();
PMC *capsnap = REPR(captype)->allocate(interp, STABLE(captype));
PMC *pos_args = Parrot_pmc_new(interp, enum_class_ResizablePMCArray);
PMC *named_args = Parrot_pmc_new(interp, enum_class_Hash);
INTVAL k;
VTABLE_set_attr_keyed(interp, capsnap, captype, LIST_str, pos_args);
VTABLE_set_attr_keyed(interp, capsnap, captype, HASH_str, named_args);
for (k = cur_pos_arg; k < num_pos_args; k++) {
cur_bv = get_positional_bind_val(interp, pc_positionals, capture, k);
VTABLE_push_pmc(interp, pos_args, cur_bv.type == BIND_VAL_OBJ ?
cur_bv.val.o :
create_box(interp, cur_bv));
}
if (!PMC_IS_NULL(named_args_copy)) {
PMC *iter = VTABLE_get_iter(interp, named_args_copy);
while (VTABLE_get_bool(interp, iter)) {
STRING *name = VTABLE_shift_string(interp, iter);
VTABLE_set_pmc_keyed_str(interp, named_args, name,
VTABLE_get_pmc_keyed_str(interp, named_args_copy, name));
}
}
cur_bv.type = BIND_VAL_OBJ;
cur_bv.val.o = capsnap;
bind_fail = Rakudo_binding_bind_one_param(interp, lexpad, sig, param, cur_bv,
no_nom_type_check, error);
}
if (bind_fail) {
return bind_fail;
}
else if (i + 1 == num_params) {
/* Since a capture acts as "the ultimate slurpy" in a sense, if
* this is the last parameter in the signature we can return
* success right off the bat. */
return BIND_RESULT_OK;
}
else {
Rakudo_Parameter *next_param = (Rakudo_Parameter *)PMC_data(
VTABLE_get_pmc_keyed_int(interp, params, i + 1));
if (next_param->flags & (SIG_ELEM_SLURPY_POS | SIG_ELEM_SLURPY_NAMED))
suppress_arity_fail = 1;
}
}
/* Could it be a named slurpy? */
else if (param->flags & SIG_ELEM_SLURPY_NAMED) {
/* Can cheat a bit if it's the default method %_.
* We give the hash to the lexpad. */
if (param->flags & SIG_ELEM_METHOD_SLURPY_NAMED && lexpad->vtable->base_type == p6l_id) {
SETATTR_Perl6LexPad_default_named_slurpy(interp, lexpad, named_args_copy);
PARROT_GC_WRITE_BARRIER(interp, lexpad);
}
else {
/* We'll either take the current named arguments copy hash which
* will by definition contain all unbound named parameters and use
* that, or just create an empty one. */
PMC *slurpy = PMC_IS_NULL(named_args_copy) ?
Parrot_pmc_new(interp, enum_class_Hash) :
named_args_copy;
cur_bv.type = BIND_VAL_OBJ;
cur_bv.val.o = Rakudo_binding_create_hash(interp, slurpy);
bind_fail = Rakudo_binding_bind_one_param(interp, lexpad, sig, param,
cur_bv, no_nom_type_check, error);
if (bind_fail)
return bind_fail;
}
/* Nullify named arguments hash now we've consumed it, to mark all
* is well. */
named_args_copy = PMCNULL;
}
/* Otherwise, maybe it's a positional. */
else if (PMC_IS_NULL(param->named_names)) {
/* Slurpy or LoL-slurpy? */
if (param->flags & (SIG_ELEM_SLURPY_POS | SIG_ELEM_SLURPY_LOL)) {
/* Create Perl 6 array, create RPA of all remaining things, then
* store it. */
PMC *temp = Parrot_pmc_new(interp, enum_class_ResizablePMCArray);
while (cur_pos_arg < num_pos_args) {
cur_bv = get_positional_bind_val(interp, pc_positionals, capture, cur_pos_arg);
VTABLE_push_pmc(interp, temp, cur_bv.type == BIND_VAL_OBJ ?
cur_bv.val.o :
create_box(interp, cur_bv));
cur_pos_arg++;
}
cur_bv.type = BIND_VAL_OBJ;
cur_bv.val.o = param->flags & SIG_ELEM_SLURPY_POS ?
Rakudo_binding_create_positional(interp, temp) :
Rakudo_binding_create_lol(interp, temp);
bind_fail = Rakudo_binding_bind_one_param(interp, lexpad, sig, param,
cur_bv, no_nom_type_check, error);
if (bind_fail)
return bind_fail;
}
/* Otherwise, a positional. */
else {
/* Do we have a value?. */
if (cur_pos_arg < num_pos_args) {
/* Easy - just bind that. */
cur_bv = get_positional_bind_val(interp, pc_positionals, capture, cur_pos_arg);
bind_fail = Rakudo_binding_bind_one_param(interp, lexpad, sig, param,
cur_bv, no_nom_type_check, error);
if (bind_fail)
return bind_fail;
cur_pos_arg++;
}
else {
/* No value. If it's optional, fetch a default and bind that;
* if not, we're screwed. Note that we never nominal type check
* an optional with no value passed. */
if (param->flags & SIG_ELEM_IS_OPTIONAL) {
cur_bv.type = BIND_VAL_OBJ;
cur_bv.val.o = Rakudo_binding_handle_optional(interp, param, lexpad);
bind_fail = Rakudo_binding_bind_one_param(interp, lexpad, sig, param,
cur_bv, 0, error);
if (bind_fail)
return bind_fail;
}
else {
if (error)
*error = Rakudo_binding_arity_fail(interp, params, num_params, num_pos_args, 0);
return BIND_RESULT_FAIL;
}
}
}
}
/* Else, it's a non-slurpy named. */
else {
/* Try and get hold of value. */
PMC *value = PMCNULL;
INTVAL num_names = VTABLE_elements(interp, param->named_names);
INTVAL j;
if (!PMC_IS_NULL(named_args_copy)) {
for (j = 0; j < num_names; j++) {
STRING *name = VTABLE_get_string_keyed_int(interp, param->named_names, j);
value = VTABLE_get_pmc_keyed_str(interp, named_args_copy, name);
if (!PMC_IS_NULL(value)) {
/* Found a value. Delete entry from to-bind args and stop looking. */
VTABLE_delete_keyed_str(interp, named_args_copy, name);
break;
}
}
}
/* Did we get one? */
if (PMC_IS_NULL(value)) {
/* Nope. We'd better hope this param was optional... */
if (param->flags & SIG_ELEM_IS_OPTIONAL) {
cur_bv.type = BIND_VAL_OBJ;
cur_bv.val.o = Rakudo_binding_handle_optional(interp, param, lexpad);
bind_fail = Rakudo_binding_bind_one_param(interp, lexpad, sig, param,
cur_bv, 0, error);
}
else if (!suppress_arity_fail) {
if (error)
*error = Parrot_sprintf_c(interp, "Required named parameter '%S' not passed",
VTABLE_get_string_keyed_int(interp, param->named_names, 0));
return BIND_RESULT_FAIL;
}
}
else {
cur_bv.type = BIND_VAL_OBJ;
cur_bv.val.o = value;
bind_fail = Rakudo_binding_bind_one_param(interp, lexpad, sig, param,
cur_bv, 0, error);
}
/* If we got a binding failure, return it. */
if (bind_fail)
return bind_fail;
}
}
/* Do we have any left-over args? */
if (cur_pos_arg < num_pos_args && !suppress_arity_fail) {
/* Oh noes, too many positionals passed. */
if (error)
*error = Rakudo_binding_arity_fail(interp, params, num_params, num_pos_args, 1);
return BIND_RESULT_FAIL;
}
if (!PMC_IS_NULL(named_args_copy) && VTABLE_elements(interp, named_args_copy)) {
/* Oh noes, unexpected named args. */
if (error) {
INTVAL num_extra = VTABLE_elements(interp, named_args_copy);
PMC *iter = VTABLE_get_iter(interp, named_args_copy);
if (num_extra == 1) {
*error = Parrot_sprintf_c(interp, "Unexpected named parameter '%S' passed",
VTABLE_shift_string(interp, iter));
}
else {
INTVAL first = 1;
STRING *comma = Parrot_str_new(interp, ", ", 0);
*error = Parrot_sprintf_c(interp, "%d unexpected named parameters passed (", num_extra);
while (VTABLE_get_bool(interp, iter)) {
STRING *name = VTABLE_shift_string(interp, iter);
if (!first)
*error = Parrot_str_concat(interp, *error, comma);
else
first = 0;
*error = Parrot_str_concat(interp, *error, name);
}
*error = Parrot_str_concat(interp, *error, Parrot_str_new(interp, ")", 0));
}
}
return BIND_RESULT_FAIL;
}
/* If we get here, we're done. */
return BIND_RESULT_OK;
}
/* Binds a single argument into the lexpad, after doing any checks that are
* needed. Also handles any type captures. If there is a sub signature, then
* re-enters the binder. Returns one of the BIND_RESULT_* codes. */
static INTVAL
Rakudo_binding_bind_one_param(PARROT_INTERP, PMC *lexpad, Rakudo_Signature *signature, Rakudo_Parameter *param,
Rakudo_BindVal orig_bv, INTVAL no_nom_type_check, STRING **error) {
PMC *decont_value = NULL;
INTVAL desired_native;
Rakudo_BindVal bv;
/* Check if boxed/unboxed expections are met. */
desired_native = param->flags & SIG_ELEM_NATIVE_VALUE;
if (desired_native == 0 && orig_bv.type == BIND_VAL_OBJ ||
desired_native == SIG_ELEM_NATIVE_INT_VALUE && orig_bv.type == BIND_VAL_INT ||
desired_native == SIG_ELEM_NATIVE_NUM_VALUE && orig_bv.type == BIND_VAL_NUM ||
desired_native == SIG_ELEM_NATIVE_STR_VALUE && orig_bv.type == BIND_VAL_STR)
{
/* We have what we want. */
bv = orig_bv;
}
else if (desired_native == 0) {
/* We need to do a boxing operation. */
bv.type = BIND_VAL_OBJ;
bv.val.o = create_box(interp, orig_bv);
}
else {
storage_spec spec;
decont_value = Rakudo_cont_decontainerize(interp, orig_bv.val.o);
spec = REPR(decont_value)->get_storage_spec(interp, STABLE(decont_value));
switch (desired_native) {
case SIG_ELEM_NATIVE_INT_VALUE:
if (spec.can_box & STORAGE_SPEC_CAN_BOX_INT) {
bv.type = BIND_VAL_INT;
bv.val.i = REPR(decont_value)->box_funcs->get_int(interp, STABLE(decont_value), OBJECT_BODY(decont_value));
}
else {
if (error)
*error = Parrot_sprintf_c(interp, "Cannot unbox argument to '%S' as a native int",
param->variable_name);
return BIND_RESULT_FAIL;
}
break;
case SIG_ELEM_NATIVE_NUM_VALUE:
if (spec.can_box & STORAGE_SPEC_CAN_BOX_NUM) {
bv.type = BIND_VAL_NUM;
bv.val.n = REPR(decont_value)->box_funcs->get_num(interp, STABLE(decont_value), OBJECT_BODY(decont_value));
}
else {
if (error)
*error = Parrot_sprintf_c(interp, "Cannot unbox argument to '%S' as a native num",
param->variable_name);
return BIND_RESULT_FAIL;
}
break;
case SIG_ELEM_NATIVE_STR_VALUE:
if (spec.can_box & STORAGE_SPEC_CAN_BOX_STR) {
bv.type = BIND_VAL_STR;
bv.val.s = REPR(decont_value)->box_funcs->get_str(interp, STABLE(decont_value), OBJECT_BODY(decont_value));
}
else {
if (error)
*error = Parrot_sprintf_c(interp, "Cannot unbox argument to '%S' as a native str",
param->variable_name);
return BIND_RESULT_FAIL;
}
break;
default:
if (error)
*error = Parrot_sprintf_c(interp, "Cannot unbox argument to '%S' as a native type",
param->variable_name);
return BIND_RESULT_FAIL;
}
decont_value = NULL;
}
/* By this point, we'll either have an object that we might be able to
* bind if it passes the type check, or a native value that needs no
* further checking. */
if (bv.type == BIND_VAL_OBJ) {
/* Ensure the value is a 6model object; if not, marshall it to one. */
if (bv.val.o->vtable->base_type != smo_id) {
bv.val.o = Rakudo_types_parrot_map(interp, bv.val.o);
if (bv.val.o->vtable->base_type != smo_id) {
*error = Parrot_sprintf_c(interp, "Unmarshallable foreign language value passed for parameter '%S'",
param->variable_name);
return BIND_RESULT_FAIL;
}
}
/* We pretty much always need to de-containerized value, so get it
* right off. */
decont_value = Rakudo_cont_decontainerize(interp, bv.val.o);
/* Skip nominal type check if not needed. */
if (!no_nom_type_check) {
PMC *nom_type;
/* Is the nominal type generic and in need of instantiation? (This
* can happen in (::T, T) where we didn't learn about the type until
* during the signature bind). */
if (param->flags & SIG_ELEM_NOMINAL_GENERIC) {
PMC *HOW = STABLE(param->nominal_type)->HOW;
PMC *ig = VTABLE_find_method(interp, HOW, INSTANTIATE_GENERIC_str);
Parrot_ext_call(interp, ig, "PiPP->P", HOW, param->nominal_type,
lexpad, &nom_type);
}
else {
nom_type = param->nominal_type;
}
/* If not, do the check. If the wanted nominal type is Mu, then
* anything goes. */
if (nom_type != Rakudo_types_mu_get() &&
(decont_value->vtable->base_type != smo_id ||
!STABLE(decont_value)->type_check(interp, decont_value, nom_type))) {
/* Type check failed; produce error if needed. */
if (error) {
PMC * got_how = STABLE(decont_value)->HOW;
PMC * exp_how = STABLE(nom_type)->HOW;
PMC * got_name_meth = VTABLE_find_method(interp, got_how, NAME_str);
PMC * exp_name_meth = VTABLE_find_method(interp, exp_how, NAME_str);
STRING * expected, * got;
Parrot_ext_call(interp, got_name_meth, "PiP->S", got_how, bv.val.o, &got);
Parrot_ext_call(interp, exp_name_meth, "PiP->S", exp_how, nom_type, &expected);
*error = Parrot_sprintf_c(interp, "Nominal type check failed for parameter '%S'; expected %S but got %S instead",
param->variable_name, expected, got);
}
/* Report junction failure mode if it's a junction. */
return junc_or_fail(interp, decont_value);
}
/* Also enforce definedness constraints. */
if (param->flags & SIG_ELEM_DEFINEDNES_CHECK) {
INTVAL defined = IS_CONCRETE(decont_value);
if (defined && param->flags & SIG_ELEM_UNDEFINED_ONLY) {
if (error)
*error = Parrot_sprintf_c(interp,
"Parameter '%S' requires a type object, but an object instance was passed",
param->variable_name);
return junc_or_fail(interp, decont_value);
}
if (!defined && param->flags & SIG_ELEM_DEFINED_ONLY) {
if (error)
*error = Parrot_sprintf_c(interp,
"Parameter '%S' requires an instance, but a type object was passed",
param->variable_name);
return junc_or_fail(interp, decont_value);
}
}
}
}
/* Do we have any type captures to bind? */
if (!PMC_IS_NULL(param->type_captures)) {
Rakudo_binding_bind_type_captures(interp, lexpad, param, bv);
}
/* Do a coercion, if one is needed. */
if (!PMC_IS_NULL(param->coerce_type)) {
/* Coercing natives not possible - nothing to call a method on. */
if (bv.type != BIND_VAL_OBJ) {
*error = Parrot_sprintf_c(interp,
"Unable to coerce natively typed parameter '%S'",
param->variable_name);
return BIND_RESULT_FAIL;
}
/* Only coerce if we don't already have the correct type. */
if (!STABLE(decont_value)->type_check(interp, decont_value, param->coerce_type)) {
PMC *coerce_meth = VTABLE_find_method(interp, decont_value, param->coerce_method);
if (!PMC_IS_NULL(coerce_meth)) {
Parrot_ext_call(interp, coerce_meth, "Pi->P", decont_value, &decont_value);
}
else {
/* No coercion method availale; whine and fail to bind. */
if (error) {
PMC * got_how = STABLE(decont_value)->HOW;
PMC * got_name_meth = VTABLE_find_method(interp, got_how, NAME_str);
STRING * got;
Parrot_ext_call(interp, got_name_meth, "PiP->S", got_how, decont_value, &got);
*error = Parrot_sprintf_c(interp,
"Unable to coerce value for '%S' from %S to %S; no coercion method defined",
param->variable_name, got, param->coerce_method);
}
return BIND_RESULT_FAIL;
}
}
}
/* If it's not got attributive binding, we'll go about binding it into the
* lex pad. */
if (!(param->flags & SIG_ELEM_BIND_ATTRIBUTIVE) && !STRING_IS_NULL(param->variable_name)) {
/* Is it native? If so, just go ahead and bind it. */
if (bv.type != BIND_VAL_OBJ) {
switch (bv.type) {
case BIND_VAL_INT:
VTABLE_set_integer_keyed_str(interp, lexpad, param->variable_name, bv.val.i);
break;
case BIND_VAL_NUM:
VTABLE_set_number_keyed_str(interp, lexpad, param->variable_name, bv.val.n);
break;
case BIND_VAL_STR:
VTABLE_set_string_keyed_str(interp, lexpad, param->variable_name, bv.val.s);
break;
}
}
/* Otherwise it's some objecty case. */
else if (param->flags & SIG_ELEM_IS_RW) {
/* XXX TODO Check if rw flag is set; also need to have a
* wrapper container that carries extra constraints. */
VTABLE_set_pmc_keyed_str(interp, lexpad, param->variable_name, bv.val.o);
}
else if (param->flags & SIG_ELEM_IS_PARCEL) {
/* Just bind the thing as is into the lexpad. */
VTABLE_set_pmc_keyed_str(interp, lexpad, param->variable_name, bv.val.o);
}
else {
/* If it's an array, copy means make a new one and store,
* and a normal bind is a straightforward binding plus
* adding a constraint. */
if (param->flags & SIG_ELEM_ARRAY_SIGIL) {
PMC *bindee = decont_value;
if (param->flags & SIG_ELEM_IS_COPY) {
bindee = Rakudo_binding_create_positional(interp,
Parrot_pmc_new(interp, enum_class_ResizablePMCArray));
Rakudo_cont_store(interp, bindee, decont_value, 0, 0);
}
VTABLE_set_pmc_keyed_str(interp, lexpad, param->variable_name, bindee);
}
/* If it's a hash, similar approach to array. */
else if (param->flags & SIG_ELEM_HASH_SIGIL) {
PMC *bindee = decont_value;
if (param->flags & SIG_ELEM_IS_COPY) {
bindee = Rakudo_binding_create_hash(interp,
Parrot_pmc_new(interp, enum_class_Hash));
Rakudo_cont_store(interp, bindee, decont_value, 0, 0);
}
VTABLE_set_pmc_keyed_str(interp, lexpad, param->variable_name, bindee);
}
/* If it's a scalar, we always need to wrap it into a new
* container and store it, for copy or ro case (the rw bit
* in the container descriptor takes care of the rest). */
else {
PMC *new_cont = Rakudo_cont_scalar_from_descriptor(interp, param->container_descriptor);
Rakudo_cont_store(interp, new_cont, decont_value, 0, 0);
VTABLE_set_pmc_keyed_str(interp, lexpad, param->variable_name, new_cont);
}
}
}
/* Is it the invocant? If so, also have to bind to self lexical. */
if (param->flags & SIG_ELEM_INVOCANT)
VTABLE_set_pmc_keyed_str(interp, lexpad, SELF_str, decont_value);
/* Handle any constraint types (note that they may refer to the parameter by
* name, so we need to have bound it already). */
if (!PMC_IS_NULL(param->post_constraints)) {
PMC * code_type = Rakudo_types_code_get();
PMC * const constraints = param->post_constraints;
INTVAL num_constraints = VTABLE_elements(interp, constraints);
INTVAL i;
for (i = 0; i < num_constraints; i++) {
/* Check we meet the constraint. */
PMC *cons_type = VTABLE_get_pmc_keyed_int(interp, constraints, i);
PMC *accepts_meth = VTABLE_find_method(interp, cons_type, ACCEPTS);
PMC *old_ctx = Parrot_pcc_get_signature(interp, CURRENT_CONTEXT(interp));
PMC *cappy = Parrot_pmc_new(interp, enum_class_CallContext);
if (STABLE(cons_type)->type_check(interp, cons_type, code_type))
Parrot_sub_capture_lex(interp,
VTABLE_get_attr_keyed(interp, cons_type, code_type, DO_str));
VTABLE_push_pmc(interp, cappy, cons_type);
switch (bv.type) {
case BIND_VAL_OBJ:
VTABLE_push_pmc(interp, cappy, bv.val.o);
break;
case BIND_VAL_INT:
VTABLE_push_integer(interp, cappy, bv.val.i);
break;
case BIND_VAL_NUM:
VTABLE_push_float(interp, cappy, bv.val.n);
break;
case BIND_VAL_STR:
VTABLE_push_string(interp, cappy, bv.val.s);
break;
}
Parrot_pcc_invoke_from_sig_object(interp, accepts_meth, cappy);
cappy = Parrot_pcc_get_signature(interp, CURRENT_CONTEXT(interp));
Parrot_pcc_set_signature(interp, CURRENT_CONTEXT(interp), old_ctx);
if (!VTABLE_get_bool(interp, VTABLE_get_pmc_keyed_int(interp, cappy, 0))) {
if (error)
*error = Parrot_sprintf_c(interp, "Constraint type check failed for parameter '%S'",
param->variable_name);
return BIND_RESULT_FAIL;
}
}
}
/* If it's attributive, now we assign it. */
if (param->flags & SIG_ELEM_BIND_ATTRIBUTIVE) {
INTVAL result = Rakudo_binding_assign_attributive(interp, lexpad, param, bv, decont_value, error);
if (result != BIND_RESULT_OK)
return result;
}
/* If it has a sub-signature, bind that. */
if (!PMC_IS_NULL(param->sub_llsig) && bv.type == BIND_VAL_OBJ) {
/* Turn value into a capture, unless we already have one. */
PMC *capture = PMCNULL;
INTVAL result;
if (param->flags & SIG_ELEM_IS_CAPTURE) {
capture = decont_value;
}
else {
PMC *meth = VTABLE_find_method(interp, decont_value, Parrot_str_new(interp, "Capture", 0));
if (PMC_IS_NULL(meth)) {
if (error)
*error = Parrot_sprintf_c(interp, "Could not turn argument into capture");
return BIND_RESULT_FAIL;
}
Parrot_ext_call(interp, meth, "Pi->P", decont_value, &capture);
}
/* Recurse into signature binder. */
result = Rakudo_binding_bind(interp, lexpad, param->sub_llsig,
capture, no_nom_type_check, error);
if (result != BIND_RESULT_OK)
{
if (error) {
/* Note in the error message that we're in a sub-signature. */
*error = Parrot_str_concat(interp, *error,
Parrot_str_new(interp, " in sub-signature", 0));
/* Have we a variable name? */
if (!STRING_IS_NULL(param->variable_name)) {
*error = Parrot_str_concat(interp, *error,
Parrot_str_new(interp, " of parameter ", 0));
*error = Parrot_str_concat(interp, *error, param->variable_name);
}
}
return result;
}
}
/* Binding of this parameter was thus successful - we're done. */
return BIND_RESULT_OK;
}