/
default.pmc
2671 lines (1701 loc) · 53.9 KB
/
default.pmc
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/*
Copyright (C) 2001-2008, Parrot 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<src/vtable.tbl> by F<tools/build/pmc2c.pl>.
=head2 Functions
=over 4
=cut
*/
#define INT2KEY(i, k) key_new_integer((i), (k))
/* undef 'interface' to keep MSVC happy */
#undef interface
/*
=item C<static STRING *caller(PARROT_INTERP, PMC *pmc)>
Returns a C string for the name of C<*pmc>.
=cut
*/
static STRING *
caller(PARROT_INTERP, PMC *pmc /*NULLOK*/)
{
STRING * const null_str = CONST_STRING(interp, "(null)");
return pmc && pmc->vtable && pmc->vtable->whoami
? VTABLE_name(interp, pmc) : null_str;
}
/*
=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
*/
PARROT_DOES_NOT_RETURN
static void
cant_do_method(PARROT_INTERP, PMC *pmc /*NULLOK*/, const char *methname)
{
Parrot_ex_throw_from_c_args(interp, NULL, EXCEPTION_ILL_INHERIT,
"%s() not implemented in class '%Ss'", methname,
caller(interp, pmc));
}
/*
=item C<static void cant_do_write_method(PARROT_INTERP, PMC *pmc,
const char *methname)>
Throws an exception "$methname() on read-only instance of '$class'", used by
all updating messages on read-only instances.
=cut
*/
PARROT_DOES_NOT_RETURN
static void
cant_do_write_method(PARROT_INTERP, PMC *pmc /*NULLOK*/, const char *methname)
{
Parrot_ex_throw_from_c_args(interp, NULL, EXCEPTION_WRITE_TO_CONSTCLASS,
"%s() in read-only instance of '%Ss'", 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
/* RT #46659
* a quick hack, to prevent freeing that string during GC
* 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 (Parrot_str_equal(interp, key, ro)) {
#else
/*
* s2 in Parrot_str_equal is freed here
*/
if (Parrot_str_equal(interp, key, CONST_STRING(interp, "_ro"))) {
#endif
/* pmc should set/clear readonly */
const INTVAL on = VTABLE_get_bool(interp, value);
/* morph to Const/normal class or readonly class */
/* RT #46661 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, interp->vtables[pmc->vtable->base_type - 1]->pmc_class);
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);
VTABLE_set_integer_native(interp, pmc_true, 1);
VTABLE_set_pmc_keyed_str(interp, prop_hash, CONST_STRING(interp, "_ro"), 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))
&& Parrot_str_equal(interp, key, CONST_STRING(interp, "_ro"))) {
PMC * const ret_val = pmc_new(interp, enum_class_Integer);
VTABLE_set_integer_native(interp, 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)
Parrot_gc_add_pmc_ext(interp, self);
PMC_metadata(self) = prop = pmc_new(interp, enum_class_Hash);
GC_WRITE_BARRIER(interp, self, NULL, prop);
VTABLE_init(interp, prop);
propagate_std_props(interp, self, prop);
return prop;
}
/*
=item C<static INTVAL
does_isa(PARROT_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(PARROT_INTERP, const STRING *method, const STRING *what)
{
INTVAL pos = 0;
INTVAL length = Parrot_str_byte_length(interp, what);
do {
INTVAL len;
INTVAL idx = Parrot_str_find_index(interp, what, method, (INTVAL)pos);
if (idx < 0)
return 0;
pos = idx;
if (pos >= length)
return 0;
len = Parrot_str_byte_length(interp, method);
if (pos && Parrot_str_indexed(interp, what, pos - 1) != 32) {
pos += len;
continue;
}
if (pos + len < length && Parrot_str_indexed(interp, what, pos + len) != 32) {
pos += len;
continue;
}
return 1;
} while (1);
}
pmclass default abstract {
/*
=back
=head2 Methods
=over 4
=item C<void init()>
Does nothing.
=cut
*/
VTABLE void init() {
}
/*
=item C<void init_pmc(PMC *initializer)>
With a null C<initializer>, calls C<init()>, else throws an exception.
=cut
*/
VTABLE void init_pmc(PMC *initializer) {
if (PMC_IS_NULL(initializer))
SELF.init();
else
Parrot_ex_throw_from_c_args(interp, NULL, EXCEPTION_ILL_INHERIT,
"init_pmc() not implemented in class '%Ss'",
caller(interp, pmc));
}
/*
=item C<PMC *instantiate(PMC *init)>
Default fallback. Creates a new PMC of the type of the class SELF and
calls init().
=cut
*/
VTABLE PMC *instantiate(PMC *init) {
const INTVAL type = VTABLE_type(INTERP, SELF);
/* Ensure no looping, as pmc_new calls the instantiate vtable entry for
* classes. */
if (PObj_is_class_TEST(SELF))
Parrot_ex_throw_from_c_args(interp, NULL, 1,
"All high-level classes should override instantiate");
if (!PMC_IS_NULL(init))
return pmc_new_init(INTERP, type, init);
return pmc_new(INTERP, type);
}
/*
=item C<void mark()>
Panics with a "no custom mark routine defined" error message.
=cut
*/
VTABLE 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
*/
VTABLE 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
*/
VTABLE 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);
VTABLE_set_pmc_keyed_str(INTERP, prop, key, value);
}
}
/*
=item C<void delprop(STRING *key)>
Deletes the property for C<*key>.
=cut
*/
VTABLE void delprop(STRING *key) {
if (SELF->pmc_ext && PMC_metadata(SELF))
VTABLE_delete_keyed_str(INTERP, PMC_metadata(SELF), key);
}
/*
=item C<PMC *getprops()>
Returns the PMC's properties or the NULL PMC if no properties exist.
=cut
*/
VTABLE PMC *getprops() {
if (!SELF->pmc_ext)
Parrot_gc_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
*/
VTABLE INTVAL type() {
return SELF->vtable->base_type;
}
/*
=item C<STRING *name()>
Returns the name of the PMC.
=cut
*/
VTABLE STRING *name() {
return SELF->vtable->whoami;
}
/*
=item C<PMC *get_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
*/
VTABLE PMC *get_namespace() {
return SELF->vtable->_namespace;
}
VTABLE PMC *find_method(STRING *method_name) {
return Parrot_find_method_with_cache(INTERP, SELF, method_name);
}
VTABLE 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
*/
VTABLE INTVAL get_integer_keyed_int(INTVAL key) {
PMC *const r_key = INT2KEY(INTERP, key);
return SELF.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
*/
VTABLE FLOATVAL get_number_keyed_int(INTVAL key) {
PMC *const r_key = INT2KEY(INTERP, key);
return SELF.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
*/
VTABLE STRING *get_string_keyed_int(INTVAL key) {
PMC *const r_key = INT2KEY(INTERP, key);
return SELF.get_string_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
*/
VTABLE PMC *get_pmc_keyed_int(INTVAL key) {
PMC *const r_key = INT2KEY(INTERP, key);
return SELF.get_pmc_keyed(r_key);
}
/*
=item C<void *get_pointer()>
Returns the address of the PMC.
=cut
*/
VTABLE void *get_pointer() {
return SELF;
}
/*
=item C<INTVAL is_same(PMC *value)>
Returns whether the PMC is the same PMC as C<value> (whether they're the
same pointer).
=cut
*/
VTABLE 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
*/
VTABLE void assign_pmc(PMC *value) {
STRING * const undef = CONST_STRING(INTERP, "Undef");
if (VTABLE_isa(INTERP, value, undef))
pmc_reuse(INTERP, SELF, value->vtable->base_type, 0);
else
SELF.set_pmc(value);
}
VTABLE void assign_string_native(STRING *value) {
SELF.set_string_native(value);
}
/*
=item C<void morph(PMC* type)>
Changes the PMC to a PMC of a new type
=cut
*/
VTABLE void morph(PMC* type) {
pmc_reuse(INTERP, SELF, VTABLE_get_integer(interp, 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
*/
VTABLE void set_integer_keyed_int(INTVAL key, INTVAL value) {
PMC *const r_key = INT2KEY(INTERP, key);
SELF.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
*/
VTABLE void set_number_keyed_int(INTVAL key, FLOATVAL value) {
PMC *const r_key = INT2KEY(INTERP, key);
SELF.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
*/
VTABLE void set_string_keyed_int(INTVAL key, STRING *string) {
PMC *const r_key = INT2KEY(INTERP, key);
SELF.set_string_keyed(r_key, string);
}
/*
=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
*/
VTABLE void set_pmc_keyed_int(INTVAL key, PMC *value) {
PMC *const r_key = INT2KEY(INTERP, key);
SELF.set_pmc_keyed(r_key, value);
}
/*
=item C<INTVAL is_equal(PMC *value)>
Default fallback. Performs a multiple dispatch call for 'is_equal'.
=cut
*/
VTABLE INTVAL is_equal(PMC *value) {
INTVAL retval;
Parrot_mmd_multi_dispatch_from_c_args(interp,
"is_equal", "PP->I", SELF, value, &retval);
return retval;
}
/*
=item C<INTVAL is_equal_num(PMC *value)>
Default fallback. Performs a multiple dispatch call for 'is_equal_num'.
=cut
*/
VTABLE INTVAL is_equal_num(PMC *value) {
INTVAL retval;
Parrot_mmd_multi_dispatch_from_c_args(interp,
"is_equal_num", "PP->I", SELF, value, &retval);
return retval;
}
/*
=item C<INTVAL is_equal_string(PMC *value)>
Default fallback. Performs a multiple dispatch call for 'is_equal'.
=cut
*/
VTABLE INTVAL is_equal_string(PMC *value) {
INTVAL retval;
Parrot_mmd_multi_dispatch_from_c_args(interp,
"is_equal_string", "PP->I", SELF, value, &retval);
return retval;
}
/*
=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
*/
VTABLE INTVAL exists_keyed_int(INTVAL key) {
PMC *const r_key = INT2KEY(INTERP, key);
return SELF.exists_keyed(r_key);
}
/*
=item C<INTVAL defined()>
Returns true.
=cut
*/
VTABLE 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
*/
VTABLE INTVAL defined_keyed_int(INTVAL key) {
PMC *const r_key = INT2KEY(INTERP, key);
return SELF.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
*/
VTABLE void delete_keyed_int(INTVAL key) {
PMC *const r_key = INT2KEY(INTERP, key);
SELF.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
*/
VTABLE PMC *nextkey_keyed_int(INTVAL key, INTVAL w) {
PMC *const r_key = INT2KEY(INTERP, key);
return SELF.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
*/
VTABLE 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
*/
VTABLE INTVAL does(STRING *_interface) {
return does_isa(INTERP, _interface, SELF->vtable->provides_str);
}
/*
=item C<INTVAL does_pmc(PMC *role)>
Reports whether the PMC "does" the C<role>.
=cut
*/
VTABLE INTVAL does_pmc(PMC *role) {
UNUSED(role)
/* No C-level roles yet. */
return 0;
}
/*
=item C<INTVAL isa_pmc(PMC *_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
*/
VTABLE INTVAL isa_pmc(PMC *lookup) {
Hash *isa_hash = SELF->vtable->isa_hash;
STRING *pmc_name;
if (PMC_IS_NULL(lookup))
return 0;
pmc_name = VTABLE_get_string(interp, lookup);
if (!isa_hash)
return Parrot_str_equal(interp, SELF->vtable->whoami, pmc_name);
/* RT #46665 - walk mro */
return parrot_hash_exists(INTERP, isa_hash, (void *)pmc_name);
}
/*
=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
*/
VTABLE INTVAL isa(STRING *_class) {
/* RT #46665 - walk mro */
if (!SELF->vtable->isa_hash)
return Parrot_str_equal(interp, SELF->vtable->whoami, _class);
return parrot_hash_exists(INTERP, SELF->vtable->isa_hash,
(void *)_class);
}
/*
=item C<PMC *inspect_str(STRING *what)>
Provides introspection of a specific piece of information about the PMC.
=cut
*/
VTABLE PMC *inspect_str(STRING *name) {
if (Parrot_str_equal(interp, name, CONST_STRING(interp, "flags"))) {
PMC *found = pmc_new(interp, enum_class_Integer);
VTABLE_set_integer_native(interp, found,
(INTVAL)PObj_get_FLAGS(SELF));
return found;
}
else if (Parrot_str_equal(interp, name, CONST_STRING(interp, "mro"))) {
return VTABLE_clone(interp, SELF->vtable->mro);
}
else
Parrot_ex_throw_from_c_args(interp, NULL, EXCEPTION_INVALID_OPERATION,
"Unknown introspection value '%S'", name);
}
/*
=item C<PMC *inspect()>
Returns a Hash describing the class, with key/value pairs as described in
inspect_str.
=cut
*/
VTABLE PMC *inspect() {
PMC *metadata = pmc_new(interp, enum_class_Hash);
STRING * const flags_str = CONST_STRING(interp, "flags");
VTABLE_set_pmc_keyed_str(interp, metadata, flags_str,
VTABLE_inspect_str(interp, SELF, flags_str));
return metadata;
}
/*
=item C<PMC *get_class()>
Returns SELF. A PMC is its own class.
=cut
*/
VTABLE PMC *get_class() {
PMC *ns = VTABLE_get_namespace(interp, SELF);
PMC *_class = PMCNULL;
if (!PMC_IS_NULL(ns))
_class = VTABLE_get_class(interp, ns);
if (PMC_IS_NULL(_class)) {
INTVAL type = VTABLE_type(interp, SELF);
PMC *type_num = pmc_new(interp, enum_class_Integer);
VTABLE_set_integer_native(interp, type_num, type);
return pmc_new_init(interp, enum_class_PMCProxy, type_num);