nativepccmethod.pmc

/*
Copyright (C) 2010-2011, Parrot Foundation.

=head1 NAME

src/pmc/nativepccmethod.pmc - Native PCC Method PMC

=head1 DESCRIPTION

Container for native functions that handle PCC on their own.

=head2 Methods

=over 4

=cut

*/

/* HEADERIZER HFILE: none */

pmclass NativePCCMethod auto_attrs provides invokable {
    ATTR STRING *signature;
    ATTR void   *func;

    /* MMD fields */
    ATTR STRING *mmd_long_signature;
    ATTR PMC    *mmd_multi_sig;

/*

=item C<void init()>

Initializes the PMC with a C<NULL> function pointer.

=cut

*/

    VTABLE void init() {
        Parrot_NativePCCMethod_attributes * const attrs = PARROT_NATIVEPCCMETHOD(SELF);

        attrs->func               = NULL;
        attrs->signature          = STRINGNULL;
        attrs->mmd_long_signature = STRINGNULL;
        attrs->mmd_multi_sig      = PMCNULL;

        PObj_custom_mark_SET(SELF);
    }

/*

=item C<void *get_pointer()>

Get the pointer to the native function.

=item C<void set_pointer_keyed_str(STRING *sig, void *func)>

Set the pointer to the native function and the PCC signature.

=cut

*/


    VTABLE void *get_pointer() {
        return PARROT_NATIVEPCCMETHOD(SELF)->func;
    }

    VTABLE void set_pointer_keyed_str(STRING *sig, void *func) {
        PARROT_NATIVEPCCMETHOD(SELF)->signature = sig;
        PARROT_NATIVEPCCMETHOD(SELF)->func = func;
    }

/*

=item C<INTVAL defined()>

=item C<INTVAL get_bool()>

NULLness check.

=cut

*/

    VTABLE INTVAL defined() {
        return !! PARROT_NATIVEPCCMETHOD(SELF)->func;
    }

    VTABLE INTVAL get_bool() {
        return STATICSELF.defined();
    }

/*

=item C<opcode_t *invoke(void *next)>

Call the function pointer.

=cut

*/

    VTABLE opcode_t *invoke(void *next) {
        void                *func;
        native_pcc_method_t  fptr;

        GET_ATTR_func(INTERP, SELF, func);
        if (!func)
            Parrot_ex_throw_from_c_args(INTERP, NULL,
                    EXCEPTION_INVALID_OPERATION,
                    "attempt to call NULL native function");

        fptr = (native_pcc_method_t)D2FPTR(func);
        fptr(INTERP);

        /*
         * If this function was tailcalled, the return result
         * is already passed back to the caller of this frame.
         * We therefore invoke the return continuation here,
         * which gets rid of this frame and returns the real
         * return address.
         */
        {
            PMC *cont = INTERP->current_cont;

            if (!PMC_IS_NULL(cont)
            && (PObj_get_FLAGS(cont) & SUB_FLAG_TAILCALL)) {
                cont = Parrot_pcc_get_continuation(interp, CURRENT_CONTEXT(interp));
                next = VTABLE_invoke(INTERP, cont, next);
            }
        }

        return (opcode_t *)next;
    }

/*

=item C<void mark()>

Mark contained elements for GC.

=cut

*/

    VTABLE void mark() {
        const Parrot_NativePCCMethod_attributes * const attrs = PARROT_NATIVEPCCMETHOD(SELF);

        Parrot_gc_mark_STRING_alive(interp, attrs->signature);
        Parrot_gc_mark_STRING_alive(interp, attrs->mmd_long_signature);
        Parrot_gc_mark_PMC_alive(interp,    attrs->mmd_multi_sig);
    }

/*

=item C<PMC *clone()>

Create a clone of this PMC.

=cut

*/

    VTABLE PMC *clone() {
        PMC * const ret = Parrot_pmc_new(INTERP, SELF->vtable->base_type);
        const Parrot_NativePCCMethod_attributes * const self_attrs = PARROT_NATIVEPCCMETHOD(SELF);
        Parrot_NativePCCMethod_attributes * const ret_attrs  = PARROT_NATIVEPCCMETHOD(ret);

        ret_attrs->func               = self_attrs->func;
        ret_attrs->signature          = self_attrs->signature;
        ret_attrs->mmd_long_signature = self_attrs->mmd_long_signature;
        ret_attrs->mmd_multi_sig      = self_attrs->mmd_multi_sig;

        return ret;
    }

/*

=item C<METHOD get_multisig()>

Return the MMD signature PMC, if any or C<PMCNULL>.

=cut

*/

    METHOD get_multisig() {
        PMC *sig;
        GET_ATTR_mmd_multi_sig(INTERP, SELF, sig);
        if (PMC_IS_NULL(sig))
            sig = PMCNULL;
        RETURN(PMC *sig);
    }
}

/*

=back

=head1 SEE ALSO

F<docs/pdds/pdd03_calling_conventions.pod>.

=cut

*/

/*
 * Local variables:
 *   c-file-style: "parrot"
 * End:
 * vim: expandtab shiftwidth=4 cinoptions='\:2=2' :
 */