imageiosize.pmc

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

=head1 NAME

src/pmc/imageiosize.pmc - ImageIOSize PMC

=head1 DESCRIPTION

Gets the size of an ImageIO image without the allocation costs.

=head1 STATIC FUNCTIONS

=over 4

=cut

*/

#define GROW_TO_16_BYTE_BOUNDARY(size) ((size) + ((size) % 16 ? 16 - (size) % 16 : 0))

/* HEADERIZER HFILE: none */
/* HEADERIZER BEGIN: static */
/* Don't modify between HEADERIZER BEGIN / HEADERIZER END.  Your changes will be lost. */

PARROT_INLINE
static int check_seen(PARROT_INTERP,
    ARGIN(const PMC *self),
    ARGIN(const PMC *v))
        __attribute__nonnull__(1)
        __attribute__nonnull__(2)
        __attribute__nonnull__(3);

#define ASSERT_ARGS_check_seen __attribute__unused__ int _ASSERT_ARGS_CHECK = (\
       PARROT_ASSERT_ARG(interp) \
    , PARROT_ASSERT_ARG(self) \
    , PARROT_ASSERT_ARG(v))
/* Don't modify between HEADERIZER BEGIN / HEADERIZER END.  Your changes will be lost. */
/* HEADERIZER END: static */

/*

=item C<static int check_seen(PARROT_INTERP, const PMC *self, const PMC *v)>

Check the seen hash to prevent duplicate serialization.

=cut

*/


PARROT_INLINE
static int
check_seen(PARROT_INTERP, ARGIN(const PMC *self), ARGIN(const PMC *v))
{
    ASSERT_ARGS(check_seen)
    const Hash * const seen =
        (Hash *)VTABLE_get_pointer(interp, PARROT_IMAGEIOSIZE(self)->seen);
    const HashBucket * const b    = Parrot_hash_get_bucket(interp, seen, v);
    if (b)
        return 1;
    else
        return 0;
}

pmclass ImageIOSize auto_attrs {
    ATTR PMC                        *seen; /* seen hash */
    ATTR PMC                        *todo; /* todo list */
    ATTR struct PackFile_ConstTable *pf_ct;
    ATTR INTVAL                      size;

/*

=back

=head1 VTABLES

=over 4

=cut

*/

/*

=item C<void init()>

Initializes the PMC.

=cut

*/
    VTABLE void init() {
        PARROT_IMAGEIOSIZE(SELF)->todo  = Parrot_pmc_new(INTERP, enum_class_ResizablePMCArray);
        PARROT_IMAGEIOSIZE(SELF)->pf_ct = NULL;
        PARROT_IMAGEIOSIZE(SELF)->size  = 0;

        PARROT_IMAGEIOSIZE(SELF)->seen = Parrot_pmc_new(INTERP, enum_class_Hash);
        VTABLE_set_pointer(INTERP, PARROT_IMAGEIOSIZE(SELF)->seen,
            Parrot_hash_new_intval_hash(INTERP));

        PObj_flag_CLEAR(private1, SELF);

        PObj_custom_mark_SET(SELF);
    }

/*

=item C<void init_pmc()>

Initializes the PMC with a pre-existing C<PackFile_ConstTable>.

=cut

*/
    VTABLE void init_pmc(PMC *pf_ct) {
        PARROT_IMAGEIOSIZE(SELF)->todo  = Parrot_pmc_new(INTERP, enum_class_ResizablePMCArray);
        PARROT_IMAGEIOSIZE(SELF)->pf_ct =
            (PackFile_ConstTable *)VTABLE_get_pointer(INTERP, pf_ct);
        PARROT_IMAGEIOSIZE(SELF)->size  = 0;

        PARROT_IMAGEIOSIZE(SELF)->seen = Parrot_pmc_new(INTERP, enum_class_Hash);
        VTABLE_set_pointer(INTERP, PARROT_IMAGEIOSIZE(SELF)->seen,
            Parrot_hash_new_intval_hash(INTERP));

        PObj_flag_SET(private1, SELF);

        PObj_custom_mark_SET(SELF);
    }


/*

=item C<void mark()>

Marks the PMC as alive.

=cut

*/
    VTABLE void mark() {
        Parrot_gc_mark_PMC_alive(INTERP, PARROT_IMAGEIOSIZE(SELF)->todo);
        Parrot_gc_mark_PMC_alive(INTERP, PARROT_IMAGEIOSIZE(SELF)->seen);
    }

/*

=item C<VTABLE PMC *get_pmc()>

Gets the result PMC after a thaw.

=cut

*/

    VTABLE PMC *get_pmc() {
        PMC * const ret = Parrot_pmc_new_init_int(INTERP, enum_class_Integer,
                PARROT_IMAGEIOSIZE(SELF)->size);
        return ret;
    }

/*

=item C<VTABLE INTVAL get_integer()>

Returns the flags describing the visit action

=cut

*/

    VTABLE INTVAL get_integer() {
        return VISIT_FREEZE_NORMAL;
    }

/*

=item C<VTABLE void push_integer(INTVAL v)>

Pushes the integer C<v> onto the end of the image.

=cut

*/

    VTABLE void push_integer(INTVAL v) {
        const size_t len = PF_size_integer() * sizeof (opcode_t);
        PARROT_IMAGEIOSIZE(SELF)->size += len;
    }


/*

=item C<VTABLE void push_float(FLOATVAL v)>

Pushes the float C<v> onto the end of the image.

=cut

*/

    VTABLE void push_float(FLOATVAL v)
    {
        const size_t len = PF_size_number() * sizeof (opcode_t);
        PARROT_IMAGEIOSIZE(SELF)->size += len;
    }


/*

=item C<VTABLE void push_string(STRING *v)>

Pushes the string C<*v> onto the end of the image.

=cut

*/

    VTABLE void push_string(STRING *v) {
        if (PObj_flag_TEST(private1, SELF)) {
            /* store a reference to constant table entry of string */
            const PackFile_ConstTable * const table = PARROT_IMAGEIOSIZE(SELF)->pf_ct;
            const int idx = PackFile_ConstTable_rlookup_str(INTERP, table, v);

            if (idx >= 0) {
                STATICSELF.push_integer(idx);
                return;
            }

            /* XXX
             * handle cases where the PMC has changed after Parrot_freeze_strings was called
             * eg: :immediate subs
             */
            STATICSELF.push_integer(-1);
            /* TODO
             * should really be:
             * PANIC(INTERP, "string not previously in constant table when freezing to packfile");
             */
        }

        {
            const size_t len = PF_size_string(v) * sizeof (opcode_t);
            PARROT_IMAGEIOSIZE(SELF)->size += len;
        }
    }

/*

=item C<VTABLE void push_pmc(PMC *v)>

Pushes a reference to pmc C<*v> onto the end of the image. If C<*v>
hasn't been seen yet, it is also pushed onto the todo list.

=cut

*/

    VTABLE void push_pmc(PMC *v) {
        if (PMC_IS_NULL(v)
        ||  check_seen(INTERP, SELF, v))
            SELF.push_integer(0);
        else {
            INTVAL cno, idx;
            PackFile_ConstTable * const ct   = PARROT_IMAGEIOSIZE(SELF)->pf_ct;
            Hash                * const seen = (Hash *)VTABLE_get_pointer(INTERP,
                                                    PARROT_IMAGEIOSIZE(SELF)->seen);

            if (PObj_flag_TEST(private1, SELF)
            &&  PackFile_ConstTable_rlookup_pmc(INTERP, ct, v, &cno, &idx)) {
                SELF.push_integer(0);
                SELF.push_integer(cno);
                SELF.push_integer(idx);
            }
            else {
                SELF.push_integer(0);
                VTABLE_push_integer(INTERP, SELF, v->vtable->base_type);
                VTABLE_push_pmc(INTERP, PARROT_IMAGEIOSIZE(SELF)->todo, v);
            }

            Parrot_hash_put(INTERP, seen, v, v);
        }
    }

    VTABLE void *get_pointer() {
        return VTABLE_get_pointer(INTERP, PARROT_IMAGEIOSIZE(SELF)->seen);
    }

    VTABLE void set_pmc(PMC *p)
    {
        if (!PObj_flag_TEST(private1, SELF)) {
            const UINTVAL header_length = GROW_TO_16_BYTE_BOUNDARY(PACKFILE_HEADER_BYTES);
            PARROT_IMAGEIOSIZE(SELF)->size += header_length;
        }

        STATICSELF.push_pmc(p);
        {
            PMC * const todo = PARROT_IMAGEIOSIZE(SELF)->todo;
            while (VTABLE_elements(INTERP, todo)) {
                PMC * const current = VTABLE_shift_pmc(INTERP, todo);
                VTABLE_freeze(INTERP, current, SELF);
                VTABLE_visit(INTERP,  current, SELF);
                SELF.push_pmc(PMC_metadata(current));
            }
        }
    }

/*

=back

=cut

*/

}

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