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default.pmc
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default.pmc
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/*
Copyright (C) 2001-2007, The Perl Foundation.
$Id$
=head1 NAME
src/pmc/default.pmc - Abstract root class
=head1 DESCRIPTION
These are the vtable functions for the default PMC class.
All methods which are not defined here get a default implementation
generated from F<vtable.tbl> by F<tools/build/pmc2c.pl>.
=head2 Functions
=over 4
=cut
*/
#include "parrot/parrot.h"
#define INT2KEY(i,k) key_new_integer((i), (k))
/* undef 'interface', because msvc is craptastic */
#undef interface
/*
=item C<static const char *caller(PARROT_INTERP, PMC *pmc)>
Returns a C string for the name of C<*pmc>.
=cut
*/
static const char *
caller(PARROT_INTERP, PMC *pmc /*NULLOK*/)
{
return pmc && pmc->vtable && pmc->vtable->whoami ?
VTABLE_name(interp, pmc)->strstart : "(null)";
}
/*
=item C<static void cant_do_method(PARROT_INTERP, PMC * pmc,
const char *methname)>
Throws an exception "$methname() not implemented in class '$class'", used by
all unimplemented messages.
=cut
*/
static void
cant_do_method(PARROT_INTERP, PMC *pmc /*NULLOK*/, const char *methname)
{
real_exception(interp, NULL, ILL_INHERIT,
"%s() not implemented in class '%s'", methname,
caller(interp, pmc));
}
/*
=item C<static INTVAL
check_set_std_props(PARROT_INTERP, PMC *pmc, STRING *key, PMC *value)>
Called from C<setprop()>.
Returns a true value if C<setprop()> can avoid actually setting a property
in the prophash. If it returns true, the property setting will be reflected
in a future call to C<propagate_std_props()>
=cut
*/
static INTVAL
check_set_std_props(PARROT_INTERP, PMC *pmc, STRING *key, PMC *value)
{
/* the quick hack below cannot be used because the string could
be constructed in an interpreter that is later destroyed */
#if 0
/* XXX
* a quick hack, to prevent freeing that string during DOD
* triggered in t/pmc/pmc_62.t when configured with --gc=libc
*/
static STRING *ro;
if (!ro)
ro = string_make(interp, "_ro", 3, "ascii",
PObj_constant_FLAG|PObj_external_FLAG);
if (!string_compare(interp, key, ro)) {
#else
/*
* s2 in string_compare is freed here
*/
if (!string_compare(interp, key,
string_from_cstring(interp, "_ro", 3))) {
#endif
/* pmc should set/clear readonly */
const INTVAL on = VTABLE_get_bool(interp, value);
/* morph to Const/normal class or readonly class */
/* XXX warn when this fails? */
if (on && (pmc->vtable->flags & VTABLE_HAS_CONST_TOO))
pmc->vtable = interp->vtables[pmc->vtable->base_type + 1];
else if (!on && (pmc->vtable->flags & (VTABLE_IS_CONST_FLAG)))
VTABLE_morph(interp, pmc, pmc->vtable->base_type - 1);
else if (on && (pmc->vtable->flags & VTABLE_HAS_READONLY_FLAG))
pmc->vtable = pmc->vtable->ro_variant_vtable;
else if (!on && (pmc->vtable->flags & VTABLE_IS_READONLY_FLAG)
&& pmc->vtable->ro_variant_vtable)
pmc->vtable = pmc->vtable->ro_variant_vtable;
else
return 0;
return 1;
}
return 0;
}
/*
=item C<static void
propagate_std_props(PARROT_INTERP, PMC *self, PMC *prop_hash)>
Set pending standard properties in C<prop_hash>.
=cut
*/
static void
propagate_std_props(PARROT_INTERP, PMC *self, PMC *prop_hash) {
if (self->vtable->flags & (VTABLE_IS_CONST_FLAG | VTABLE_IS_READONLY_FLAG)){
PMC * const pmc_true = pmc_new(interp, enum_class_Integer);
PMC_int_val(pmc_true) = 1;
VTABLE_set_pmc_keyed_str(interp, prop_hash,
string_from_cstring(interp, "_ro", 3), pmc_true);
}
}
/*
=item C<static INTVAL
has_pending_std_props(PMC *self)>
Returns true if propagate_std_props() would create a non-empty prophash.
=cut
*/
static INTVAL
has_pending_std_props(PMC *self) {
if (self->vtable->flags & (VTABLE_IS_CONST_FLAG | VTABLE_IS_READONLY_FLAG))
return 1;
else
return 0;
}
/*
=item C<static PMC*
check_get_std_props(PARROT_INTERPeter, PMC *self, STRING *key)>
Checks if we can infer the value of C<key> property from C<self> without
looking at its prophash. Returns C<PMCNULL> if not, returns the value otherwise.
=cut
*/
static PMC*
check_get_std_props(PARROT_INTERP, PMC *self, STRING *key) {
if ((self->vtable->flags & (VTABLE_IS_CONST_FLAG | VTABLE_IS_READONLY_FLAG))
&&!string_compare(interp, key,
string_from_cstring(interp, "_ro", 3))) {
PMC * const ret_val = pmc_new(interp, enum_class_Integer);
PMC_int_val(ret_val) = 1;
return ret_val;
}
else
return PMCNULL;
}
/*
=item C<static PMC *
make_prop_hash(PARROT_INTERP, PMC *self)>
Create a property hash for C<self>. Returns the created hash. Inferred
properties will be added to the hash and it will be set as
C<PMC_metadata(self)>.
=cut
*/
static PMC*
make_prop_hash(PARROT_INTERP, PMC *self) {
PMC *prop;
if (!self->pmc_ext)
add_pmc_ext(interp, self);
PMC_metadata(self) = prop = pmc_new_noinit(interp, enum_class_Hash);
DOD_WRITE_BARRIER(interp, self, NULL, prop);
VTABLE_init(interp, prop);
propagate_std_props(interp, self, prop);
return prop;
}
/*
=item C<static INTVAL
does_isa(Interp *interp, STRING *method, STRING *what)>
Compares C<*method> and C<*what>.
Returns true (1) if B<method> is found in B<what>, false (0) otherwise.
=cut
*/
static INTVAL
does_isa(Interp *interp, const STRING *method, const STRING *what)
{
INTVAL pos = 0;
do {
INTVAL len;
pos = string_str_index(interp, what, method, pos);
if (pos < 0)
return 0;
if (pos >= (INTVAL)string_length(interp, what))
return 0;
len = string_length(interp, method);
if (pos && string_index(interp, what, pos - 1) != 32) {
pos += len;
continue;
}
if (pos+len < (INTVAL)string_length(interp, what) &&
string_index(interp, what, pos + len) != 32) {
pos += len;
continue;
}
return 1;
} while (1);
return 0;
}
pmclass default abstract noinit {
/*
=back
=head2 Methods
=over 4
=item C<void init()>
Does nothing.
=cut
*/
void init() {
}
/*
=item C<void init_pmc(PMC *initializer)>
With a null C<initializer>, calls C<init()>, else throws an exception.
=cut
*/
void init_pmc(PMC *initializer) {
if (PMC_IS_NULL(initializer))
DYNSELF.init();
else
real_exception(interp, NULL, ILL_INHERIT,
"init_pmc() not implemented in class '%s'",
caller(interp, pmc));
}
/*
=item C<PMC *instantiate(PMC *sig)>
Default fallback. Creates a new PMC of the type of the class SELF and
calls init().
=cut
*/
PMC *instantiate(PMC *sig) {
const INTVAL type = SELF->vtable->base_type;
PMC *const ret = pmc_new_noinit(INTERP, type);
VTABLE_init(INTERP, ret);
return ret;
}
/*
=item C<void mark()>
Panics with a "no custom mark routine defined" error message.
=cut
*/
void mark() {
PANIC(INTERP, "custom_mark flag set but no custom mark routine defined");
}
/*
=item C<PMC *getprop(STRING *key)>
Returns the property for C<*key>. If no property is defined then the
NULL PMC is returned.
=cut
*/
PMC *getprop(STRING *key) {
if (SELF->pmc_ext && PMC_metadata(SELF)) {
return VTABLE_get_pmc_keyed_str(INTERP, PMC_metadata(SELF), key);
}
else {
return check_get_std_props(interp, SELF, key);
}
}
/*
=item C<void setprop(STRING *key, PMC *value)>
Sets the property for C<*key> to C<*value>.
=cut
*/
void setprop(STRING *key, PMC *value) {
if (check_set_std_props(INTERP, SELF, key, value)) {
return;
}
if (SELF->pmc_ext && PMC_metadata(SELF)) {
VTABLE_set_pmc_keyed_str(INTERP,
PMC_metadata(SELF), key, value);
}
else {
PMC * const prop = make_prop_hash(INTERP, SELF);
/* XXX is this too late for --gc-debug? */
VTABLE_set_pmc_keyed_str(INTERP, prop, key, value);
#if 0
PObj_report_SET(PMC_metadata(SELF));
#endif
}
return;
}
/*
=item C<void delprop(STRING *key)>
Deletes the property for C<*key>.
=cut
*/
void delprop(STRING *key) {
if (SELF->pmc_ext && PMC_metadata(SELF)) {
VTABLE_delete_keyed_str(INTERP, PMC_metadata(SELF), key);
}
return;
}
/*
=item C<PMC *getprops()>
Returns the PMC's properties or the NULL PMC if no properties exist.
=cut
*/
PMC *getprops() {
if (!SELF->pmc_ext)
add_pmc_ext(INTERP, SELF);
if (!PMC_metadata(SELF)) {
if (has_pending_std_props(SELF))
return make_prop_hash(INTERP, SELF);
else
return PMCNULL;
}
return PMC_metadata(SELF);
}
/*
=item C<INTVAL type()>
Returns the PMC's type.
=cut
*/
INTVAL type() {
return SELF->vtable->base_type;
}
/*
=item C<INTVAL type_keyed_int(INTVAL key)>
Converts C<key> to a PMC key and returns the result of calling
C<type_keyed()> with it.
=cut
*/
INTVAL type_keyed_int(INTVAL key) {
PMC *const r_key = INT2KEY(INTERP, key);
return DYNSELF.type_keyed(r_key);
}
/*
=item C<STRING *name()>
Returns the name of the PMC.
=cut
*/
STRING *name() {
return SELF->vtable->whoami;
}
/*
=item C<PMC *pmc_namespace>
Return the namespace for this PMC.
=item C<PMC *find_method(STRING *method_name)>
Looks up the method for C<*method_name> and returns it. If no method is
found then C<NULL> is returned.
=item C<void add_method(STRING *method_name, PMC *sub)>
Store the method as a global in the namespace of this class.
=cut
*/
PMC *pmc_namespace() {
return SELF->vtable->_namespace;
}
PMC *find_method(STRING *method_name) {
return Parrot_find_method_with_cache(INTERP, SELF, method_name);
}
void add_method(STRING *method_name, PMC *sub_pmc) {
VTABLE_set_pmc_keyed_str(INTERP,
SELF->vtable->_namespace,
method_name, sub_pmc);
}
/*
=item C<INTVAL get_integer_keyed_int(INTVAL key)>
Converts C<key> to a PMC key and returns the result of calling
C<get_integer_keyed()> with it.
=cut
*/
INTVAL get_integer_keyed_int(INTVAL key) {
PMC *const r_key = INT2KEY(INTERP, key);
return DYNSELF.get_integer_keyed(r_key);
}
/*
=item C<FLOATVAL get_number_keyed_int(INTVAL key)>
Converts C<key> to a PMC key and returns the result of calling
C<get_number_keyed()> with it.
=cut
*/
FLOATVAL get_number_keyed_int(INTVAL key) {
PMC *const r_key = INT2KEY(INTERP, key);
return DYNSELF.get_number_keyed(r_key);
}
/*
=item C<STRING *get_string_keyed_int(INTVAL key)>
Converts C<key> to a PMC key and returns the result of calling
C<get_string_keyed()> with it.
=cut
*/
STRING *get_string_keyed_int(INTVAL key) {
PMC *const r_key = INT2KEY(INTERP, key);
return DYNSELF.get_string_keyed(r_key);
}
/*
=item C<INTVAL get_bool_keyed_int(INTVAL key)>
Converts C<key> to a PMC key and returns the result of calling
C<get_bool_keyed()> with it.
=cut
*/
INTVAL get_bool_keyed_int(INTVAL key) {
PMC *const r_key = INT2KEY(INTERP, key);
return DYNSELF.get_bool_keyed(r_key);
}
/*
=item C<INTVAL elements_keyed_int(INTVAL key)>
Converts C<key> to a PMC key and returns the result of calling
C<elements_keyed()> with it.
=cut
*/
INTVAL elements_keyed_int(INTVAL key) {
PMC *const r_key = INT2KEY(INTERP, key);
return DYNSELF.elements_keyed(r_key);
}
/*
=item C<PMC *get_pmc_keyed_int(INTVAL key)>
Converts C<key> to a PMC key and returns the result of calling
C<get_pmc_keyed()> with it.
=cut
*/
PMC *get_pmc_keyed_int(INTVAL key) {
PMC *const r_key = INT2KEY(INTERP, key);
return DYNSELF.get_pmc_keyed(r_key);
}
/*
=item C<void *get_pointer()>
Returns the address of the PMC.
=cut
*/
void *get_pointer() {
return SELF;
}
/*
=item C<INTVAL is_same(PMC *value)>
Returns whether the PMC is numerically equal to C<value>.
=cut
*/
INTVAL is_same(PMC *value) {
return SELF == value;
}
/*
=item C<void assign_pmc(PMC *value)>
=item C<void assign_string_native(PMC *value)>
Defaults fall back to C<set_pmc> and C<set_string_native>.
=cut
*/
void assign_pmc(PMC *value) {
STRING * const undef = string_from_cstring(INTERP, "Undef", 5);
if (VTABLE_isa(INTERP, value, undef))
pmc_reuse(INTERP, SELF, value->vtable->base_type, 0);
else
DYNSELF.set_pmc(value);
}
void assign_string_native(STRING *value) {
DYNSELF.set_string_native(value);
}
/*
=item C<void morph(INTVAL type)>
Changes the PMC to a PMC of a new type
=cut
*/
void morph(INTVAL type) {
pmc_reuse(INTERP, SELF, type, 0);
}
/*
=item C<void set_integer_keyed_int(INTVAL key, INTVAL value)>
Converts C<key> to a PMC key and calls C<set_integer_keyed()> with it
and C<value>.
=cut
*/
void set_integer_keyed_int(INTVAL key, INTVAL value) {
PMC *const r_key = INT2KEY(INTERP, key);
DYNSELF.set_integer_keyed(r_key, value);
}
/*
=item C<void set_number_keyed_int(INTVAL key, FLOATVAL value)>
Converts C<key> to a PMC key and calls C<set_number_keyed()> with it
and C<value>.
=cut
*/
void set_number_keyed_int(INTVAL key, FLOATVAL value) {
PMC *const r_key = INT2KEY(INTERP, key);
DYNSELF.set_number_keyed(r_key, value);
}
/*
=item C<void set_string_keyed_int(INTVAL key, STRING *string)>
Converts C<key> to a PMC key and calls C<set_string_keyed()> with it
and C<value>.
=cut
*/
void set_string_keyed_int(INTVAL key, STRING *string) {
PMC *const r_key = INT2KEY(INTERP, key);
DYNSELF.set_string_keyed(r_key, string);
}
/*
=item C<void set_bool_keyed_int(INTVAL key, INTVAL value)>
Converts C<key> to a PMC key and calls C<set_bool_keyed()> with it
and C<value>.
=cut
*/
void set_bool_keyed_int(INTVAL key, INTVAL value) {
PMC *const r_key = INT2KEY(INTERP, key);
DYNSELF.set_bool_keyed(r_key, value);
}
/*
=item C<void set_pmc_keyed_int(INTVAL key, PMC *value)>
Converts C<key> to a PMC key and calls C<set_pmc_keyed()> with it
and C<value>.
=cut
*/
void set_pmc_keyed_int(INTVAL key, PMC *value) {
PMC *const r_key = INT2KEY(INTERP, key);
DYNSELF.set_pmc_keyed(r_key, value);
}
/*
=item C<INTVAL is_equal(PMC *value)>
Returns whether the PMC is equal to C<*value>.
=cut
*/
INTVAL is_equal(PMC *value) {
return (SELF->vtable == value->vtable
&& PMC_struct_val(SELF) == PMC_struct_val(value)
&& PMC_data(SELF) == PMC_data(value));
}
/*
=item C<INTVAL is_equal_num(PMC *value)>
Returns whether the PMC is numerically equal to C<*value>.
=cut
*/
INTVAL is_equal_num(PMC *value) {
return (VTABLE_get_number(INTERP, SELF) ==
VTABLE_get_number(INTERP, value));
}
/*
=item C<INTVAL is_equal_str(PMC *value)>
Returns whether the PMC is numerically equal to C<*value>.
=cut
*/
INTVAL is_equal_str(PMC *value) {
return (0 == string_equal(INTERP, VTABLE_get_string(INTERP, SELF),
VTABLE_get_string(INTERP, value)));
}
/*
=item C<INTVAL exists_keyed_int(INTVAL key)>
Converts C<key> to a PMC key and returns the result of calling
C<exists_keyed()> with it.
=cut
*/
INTVAL exists_keyed_int(INTVAL key) {
PMC *const r_key = INT2KEY(INTERP, key);
return DYNSELF.exists_keyed(r_key);
}
/*
=item C<INTVAL defined()>
Returns true.
=cut
*/
INTVAL defined() {
return 1;
}
/*
=item C<INTVAL defined_keyed_int(INTVAL key)>
Converts C<key> to a PMC key and returns the result of calling
C<defined_keyed()> with it.
=cut
*/
INTVAL defined_keyed_int(INTVAL key) {
PMC *const r_key = INT2KEY(INTERP, key);
return DYNSELF.defined_keyed(r_key);
}
/*
=item C<void delete_keyed_int(INTVAL key)>
Converts C<key> to a PMC key and calls C<delete_keyed()> with it.
=cut
*/
void delete_keyed_int(INTVAL key) {
PMC *const r_key = INT2KEY(INTERP, key);
DYNSELF.delete_keyed(r_key);
}
/*
=item C<PMC *nextkey_keyed_int(INTVAL key, INTVAL w)>
Converts C<key> to a PMC key and returns the result of calling
C<nextkey_keyed()> with it.
=cut
*/
PMC *nextkey_keyed_int(INTVAL key, INTVAL w) {
PMC *const r_key = INT2KEY(INTERP, key);
return DYNSELF.nextkey_keyed(r_key, w);
}
/*
=item C<INTVAL can(STRING *method)>
Reports whether the PMC "can" perform C<method>.
If the PMC implements the vtable function C<method>,
true (1) is returned; otherwise, false (0) is returned.
=cut
*/
INTVAL can(STRING *method) {
return !PMC_IS_NULL(VTABLE_find_method(INTERP, SELF, method));
}
/*
=item C<INTVAL does(STRING *interface)>
Reports whether the PMC "does" perform C<interface>.
If the interface C<interface> is found in the PMC's interface list,
true (1) is returned; otherwise, false (0) is returned.
=cut
*/
INTVAL does(STRING *_interface) {
return does_isa(INTERP, _interface, SELF->vtable->does_str);
}
/*
=item C<INTVAL isa(STRING *_class)>
Reports whether the PMC "isa" C<_class>.
If the class C<_class> is found in the PMC's class hierarchy,
true (1) is returned; otherwise, false (0) is returned.
=cut
*/
INTVAL isa(STRING *_class) {
/* TODO FIXME - walk mro */
return does_isa(INTERP, _class, SELF->vtable->isa_str);
}
/*
=item C<PMC *subclass(PMC *name)>
Creates a subclass, optionally with a given C<name>.
=cut
*/
PMC *subclass(PMC *name) {
return Parrot_single_subclass(INTERP, SELF, name);
}
/*
=item C<PMC *get_class()>
Returns SELF. A PMC is it's own class.
=item C<PMC *get_attr_str(STRING *attr)>
Look for NCI methods and properties.
=cut
*/
PMC *get_class() {
return SELF;
}
PMC *get_attr_str(STRING *name) {
PMC *p = NULL;
/* let's look for props first
* XXX do we need that in the default object system?
*/
if (SELF->pmc_ext && PMC_metadata(SELF)) {
const HashBucket * const b =
parrot_hash_get_bucket(INTERP, (Hash*) PMC_metadata(SELF), name);
if (b)
p = (PMC *)b->value;
}
/* may be NCI? */
if (PMC_IS_NULL(p))
p = VTABLE_find_method(INTERP, SELF, name);
if (PMC_IS_NULL(p)) {
/* TODO AttributeError */
}
else if (VTABLE_isa(INTERP, p, CONST_STRING(INTERP, "NCI"))) {
PMC * const bound_meth = VTABLE_clone(INTERP, p);
bound_meth->vtable = interp->vtables[enum_class_Bound_NCI];
VTABLE_set_pmc(INTERP, bound_meth, SELF);
return bound_meth;
}
else if (p->vtable->base_type == enum_class_MultiSub) {
PMC * const bound_meth = pmc_new(INTERP, enum_class_Bound_NCI);
VTABLE_set_pmc(INTERP, bound_meth, SELF);
PMC_struct_val(bound_meth) = p;
PObj_get_FLAGS(bound_meth) |= PObj_private0_FLAG;
return bound_meth;
}
/* TODO bound user functions */
return p;
}
/*
=item C<void add_parent(PMC *parent)>
Add class C<parent> to the list of our parents.
=cut