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pmc_freeze.c
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pmc_freeze.c
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/*
Copyright (C) 2001-2009, Parrot Foundation.
$Id$
=head1 NAME
src/pmc_freeze.c - Freeze and thaw functionality
=head1 DESCRIPTION
Freeze uses the C<next_for_GC pointer()> to remember seen PMCs. PMCs are
written as IDs (or tags), which are calculated from their arena address.
This PMC number is multiplied by four. The 2 low bits indicate a seen
PMC or a PMC of the same type as the previous one respectively.
Thawing PMCs uses a list with (maximum) size of the amount of PMCs to
keep track of retrieved PMCs.
The individual information of PMCs is frozen/thawed by their vtables.
To avoid recursion, the whole functionality is driven by
C<< pmc->vtable->visit >>, which is called for the first PMC initially.
Container PMCs call a "todo-callback" for all contained PMCs. The
individual action vtable (freeze/thaw) is then called for all todo-PMCs.
In the current implementation C<IMAGE_IO> is a stand-in for some kind of
serializer PMC which will eventually be written. It associates a Parrot
C<STRING> with a vtable.
=cut
*/
#include "parrot/parrot.h"
#include "pmc_freeze.str"
/* HEADERIZER HFILE: include/parrot/pmc_freeze.h */
/* HEADERIZER BEGIN: static */
/* Don't modify between HEADERIZER BEGIN / HEADERIZER END. Your changes will be lost. */
static void add_pmc_todo_list(PARROT_INTERP,
ARGIN_NULLOK(PMC *pmc),
ARGIN(visit_info *info))
__attribute__nonnull__(1)
__attribute__nonnull__(3);
static void create_image(PARROT_INTERP,
ARGIN_NULLOK(PMC *pmc),
ARGMOD(visit_info *info))
__attribute__nonnull__(1)
__attribute__nonnull__(3)
FUNC_MODIFIES(*info);
PARROT_INLINE
static void do_action(PARROT_INTERP,
ARGIN_NULLOK(PMC *pmc),
ARGIN(visit_info *info),
int seen,
UINTVAL id)
__attribute__nonnull__(1)
__attribute__nonnull__(3);
PARROT_INLINE
static void do_thaw(PARROT_INTERP,
ARGIN_NULLOK(PMC *pmc),
ARGIN(visit_info *info))
__attribute__nonnull__(1)
__attribute__nonnull__(3);
PARROT_INLINE
static void freeze_pmc(PARROT_INTERP,
ARGIN_NULLOK(PMC *pmc),
ARGIN(visit_info *info),
int seen,
UINTVAL id)
__attribute__nonnull__(1)
__attribute__nonnull__(3);
static void ft_init(PARROT_INTERP, ARGIN(visit_info *info))
__attribute__nonnull__(1)
__attribute__nonnull__(2);
PARROT_INLINE
static void op_check_size(PARROT_INTERP, ARGIN(STRING *s), size_t len)
__attribute__nonnull__(1)
__attribute__nonnull__(2);
static void push_opcode_integer(PARROT_INTERP,
ARGIN(IMAGE_IO *io),
INTVAL v)
__attribute__nonnull__(1)
__attribute__nonnull__(2);
static void push_opcode_number(PARROT_INTERP,
ARGIN(IMAGE_IO *io),
FLOATVAL v)
__attribute__nonnull__(1)
__attribute__nonnull__(2);
static void push_opcode_pmc(PARROT_INTERP,
ARGIN(IMAGE_IO *io),
ARGIN(PMC* v))
__attribute__nonnull__(1)
__attribute__nonnull__(2)
__attribute__nonnull__(3);
static void push_opcode_string(PARROT_INTERP,
ARGIN(IMAGE_IO *io),
ARGIN(STRING *v))
__attribute__nonnull__(1)
__attribute__nonnull__(2)
__attribute__nonnull__(3);
PARROT_WARN_UNUSED_RESULT
PARROT_CAN_RETURN_NULL
static PMC* run_thaw(PARROT_INTERP,
ARGIN(STRING* image),
visit_enum_type what)
__attribute__nonnull__(1)
__attribute__nonnull__(2);
static INTVAL shift_opcode_integer(SHIM_INTERP, ARGIN(IMAGE_IO *io))
__attribute__nonnull__(2);
static FLOATVAL shift_opcode_number(SHIM_INTERP, ARGIN(IMAGE_IO *io))
__attribute__nonnull__(2);
PARROT_WARN_UNUSED_RESULT
PARROT_CAN_RETURN_NULL
static PMC* shift_opcode_pmc(PARROT_INTERP, ARGIN(IMAGE_IO *io))
__attribute__nonnull__(1)
__attribute__nonnull__(2);
PARROT_WARN_UNUSED_RESULT
PARROT_CANNOT_RETURN_NULL
static STRING* shift_opcode_string(PARROT_INTERP, ARGIN(IMAGE_IO *io))
__attribute__nonnull__(1)
__attribute__nonnull__(2);
PARROT_INLINE
PARROT_CANNOT_RETURN_NULL
static PMC* thaw_create_pmc(PARROT_INTERP,
ARGIN(const visit_info *info),
INTVAL type)
__attribute__nonnull__(1)
__attribute__nonnull__(2);
PARROT_INLINE
static int thaw_pmc(PARROT_INTERP,
ARGMOD(visit_info *info),
ARGOUT(UINTVAL *id),
ARGOUT(INTVAL *type))
__attribute__nonnull__(1)
__attribute__nonnull__(2)
__attribute__nonnull__(3)
__attribute__nonnull__(4)
FUNC_MODIFIES(*info)
FUNC_MODIFIES(*id)
FUNC_MODIFIES(*type);
static void todo_list_init(PARROT_INTERP, ARGOUT(visit_info *info))
__attribute__nonnull__(1)
__attribute__nonnull__(2)
FUNC_MODIFIES(*info);
PARROT_INLINE
static int todo_list_seen(PARROT_INTERP,
ARGIN(PMC *pmc),
ARGMOD(visit_info *info),
ARGOUT(UINTVAL *id))
__attribute__nonnull__(1)
__attribute__nonnull__(2)
__attribute__nonnull__(3)
__attribute__nonnull__(4)
FUNC_MODIFIES(*info)
FUNC_MODIFIES(*id);
static void visit_loop_todo_list(PARROT_INTERP,
ARGIN_NULLOK(PMC *current),
ARGIN(visit_info *info))
__attribute__nonnull__(1)
__attribute__nonnull__(3);
static void visit_todo_list(PARROT_INTERP,
ARGIN_NULLOK(PMC* pmc),
ARGIN(visit_info* info))
__attribute__nonnull__(1)
__attribute__nonnull__(3);
static void visit_todo_list_thaw(PARROT_INTERP,
ARGIN_NULLOK(PMC* old),
ARGIN(visit_info* info))
__attribute__nonnull__(1)
__attribute__nonnull__(3);
#define ASSERT_ARGS_add_pmc_todo_list __attribute__unused__ int _ASSERT_ARGS_CHECK = \
PARROT_ASSERT_ARG(interp) \
&& PARROT_ASSERT_ARG(info)
#define ASSERT_ARGS_create_image __attribute__unused__ int _ASSERT_ARGS_CHECK = \
PARROT_ASSERT_ARG(interp) \
&& PARROT_ASSERT_ARG(info)
#define ASSERT_ARGS_do_action __attribute__unused__ int _ASSERT_ARGS_CHECK = \
PARROT_ASSERT_ARG(interp) \
&& PARROT_ASSERT_ARG(info)
#define ASSERT_ARGS_do_thaw __attribute__unused__ int _ASSERT_ARGS_CHECK = \
PARROT_ASSERT_ARG(interp) \
&& PARROT_ASSERT_ARG(info)
#define ASSERT_ARGS_freeze_pmc __attribute__unused__ int _ASSERT_ARGS_CHECK = \
PARROT_ASSERT_ARG(interp) \
&& PARROT_ASSERT_ARG(info)
#define ASSERT_ARGS_ft_init __attribute__unused__ int _ASSERT_ARGS_CHECK = \
PARROT_ASSERT_ARG(interp) \
&& PARROT_ASSERT_ARG(info)
#define ASSERT_ARGS_op_check_size __attribute__unused__ int _ASSERT_ARGS_CHECK = \
PARROT_ASSERT_ARG(interp) \
&& PARROT_ASSERT_ARG(s)
#define ASSERT_ARGS_push_opcode_integer __attribute__unused__ int _ASSERT_ARGS_CHECK = \
PARROT_ASSERT_ARG(interp) \
&& PARROT_ASSERT_ARG(io)
#define ASSERT_ARGS_push_opcode_number __attribute__unused__ int _ASSERT_ARGS_CHECK = \
PARROT_ASSERT_ARG(interp) \
&& PARROT_ASSERT_ARG(io)
#define ASSERT_ARGS_push_opcode_pmc __attribute__unused__ int _ASSERT_ARGS_CHECK = \
PARROT_ASSERT_ARG(interp) \
&& PARROT_ASSERT_ARG(io) \
&& PARROT_ASSERT_ARG(v)
#define ASSERT_ARGS_push_opcode_string __attribute__unused__ int _ASSERT_ARGS_CHECK = \
PARROT_ASSERT_ARG(interp) \
&& PARROT_ASSERT_ARG(io) \
&& PARROT_ASSERT_ARG(v)
#define ASSERT_ARGS_run_thaw __attribute__unused__ int _ASSERT_ARGS_CHECK = \
PARROT_ASSERT_ARG(interp) \
&& PARROT_ASSERT_ARG(image)
#define ASSERT_ARGS_shift_opcode_integer __attribute__unused__ int _ASSERT_ARGS_CHECK = \
PARROT_ASSERT_ARG(io)
#define ASSERT_ARGS_shift_opcode_number __attribute__unused__ int _ASSERT_ARGS_CHECK = \
PARROT_ASSERT_ARG(io)
#define ASSERT_ARGS_shift_opcode_pmc __attribute__unused__ int _ASSERT_ARGS_CHECK = \
PARROT_ASSERT_ARG(interp) \
&& PARROT_ASSERT_ARG(io)
#define ASSERT_ARGS_shift_opcode_string __attribute__unused__ int _ASSERT_ARGS_CHECK = \
PARROT_ASSERT_ARG(interp) \
&& PARROT_ASSERT_ARG(io)
#define ASSERT_ARGS_thaw_create_pmc __attribute__unused__ int _ASSERT_ARGS_CHECK = \
PARROT_ASSERT_ARG(interp) \
&& PARROT_ASSERT_ARG(info)
#define ASSERT_ARGS_thaw_pmc __attribute__unused__ int _ASSERT_ARGS_CHECK = \
PARROT_ASSERT_ARG(interp) \
&& PARROT_ASSERT_ARG(info) \
&& PARROT_ASSERT_ARG(id) \
&& PARROT_ASSERT_ARG(type)
#define ASSERT_ARGS_todo_list_init __attribute__unused__ int _ASSERT_ARGS_CHECK = \
PARROT_ASSERT_ARG(interp) \
&& PARROT_ASSERT_ARG(info)
#define ASSERT_ARGS_todo_list_seen __attribute__unused__ int _ASSERT_ARGS_CHECK = \
PARROT_ASSERT_ARG(interp) \
&& PARROT_ASSERT_ARG(pmc) \
&& PARROT_ASSERT_ARG(info) \
&& PARROT_ASSERT_ARG(id)
#define ASSERT_ARGS_visit_loop_todo_list __attribute__unused__ int _ASSERT_ARGS_CHECK = \
PARROT_ASSERT_ARG(interp) \
&& PARROT_ASSERT_ARG(info)
#define ASSERT_ARGS_visit_todo_list __attribute__unused__ int _ASSERT_ARGS_CHECK = \
PARROT_ASSERT_ARG(interp) \
&& PARROT_ASSERT_ARG(info)
#define ASSERT_ARGS_visit_todo_list_thaw __attribute__unused__ int _ASSERT_ARGS_CHECK = \
PARROT_ASSERT_ARG(interp) \
&& PARROT_ASSERT_ARG(info)
/* Don't modify between HEADERIZER BEGIN / HEADERIZER END. Your changes will be lost. */
/* HEADERIZER END: static */
/* when thawing a string longer then this size, we first do a GC run and then
* block GC - the system can't give us more headers */
#define THAW_BLOCK_GC_SIZE 100000
/* preallocate freeze image for aggregates with this estimation */
#define FREEZE_BYTES_PER_ITEM 9
/*
=head2 C<opcode_t> IO Functions
=over 4
=item C<static void op_check_size(PARROT_INTERP, STRING *s, size_t len)>
Checks the size of the "stream" buffer to see if it can accommodate
C<len> more bytes. If not, expands the buffer.
=cut
*/
PARROT_INLINE
static void
op_check_size(PARROT_INTERP, ARGIN(STRING *s), size_t len)
{
ASSERT_ARGS(op_check_size)
const size_t used = s->bufused;
const int need_free = (int)Buffer_buflen(s) - used - len;
/* grow by factor 1.5 or such */
if (need_free <= 16) {
size_t new_size = (size_t) (Buffer_buflen(s) * 1.5);
if (new_size < Buffer_buflen(s) - need_free + 512)
new_size = Buffer_buflen(s) - need_free + 512;
Parrot_gc_reallocate_string_storage(interp, s, new_size);
PARROT_ASSERT(Buffer_buflen(s) - used - len >= 15);
}
#ifndef DISABLE_GC_DEBUG
Parrot_gc_compact_memory_pool(interp);
#endif
}
/*
=item C<static void push_opcode_integer(PARROT_INTERP, IMAGE_IO *io, INTVAL v)>
Pushes the integer C<v> onto the end of the C<*io> "stream".
XXX assumes sizeof (opcode_t) == sizeof (INTVAL).
=cut
*/
static void
push_opcode_integer(PARROT_INTERP, ARGIN(IMAGE_IO *io), INTVAL v)
{
ASSERT_ARGS(push_opcode_integer)
UINTVAL size = sizeof (opcode_t);
STRING *op = Parrot_str_new_init(interp, (char *)&v, size,
Parrot_fixed_8_encoding_ptr, Parrot_binary_charset_ptr, 0);
PARROT_ASSERT(sizeof (opcode_t) == sizeof (INTVAL));
io->image = Parrot_str_append(interp, io->image, op);
}
/*
=item C<static void push_opcode_number(PARROT_INTERP, IMAGE_IO *io, FLOATVAL v)>
Pushes the number C<v> onto the end of the C<*io> "stream".
=cut
*/
static void
push_opcode_number(PARROT_INTERP, ARGIN(IMAGE_IO *io), FLOATVAL v)
{
ASSERT_ARGS(push_opcode_number)
opcode_t *ignored;
STRING * const s = io->image;
const size_t len = PF_size_number() * sizeof (opcode_t);
const size_t used = s->bufused;
op_check_size(interp, s, len);
ignored = PF_store_number((opcode_t *)((ptrcast_t)s->strstart + used), &v);
UNUSED(ignored);
s->bufused += len;
s->strlen += len;
}
/*
=item C<static void push_opcode_string(PARROT_INTERP, IMAGE_IO *io, STRING *v)>
Pushes the string C<*v> onto the end of the C<*io> "stream".
=cut
*/
static void
push_opcode_string(PARROT_INTERP, ARGIN(IMAGE_IO *io), ARGIN(STRING *v))
{
ASSERT_ARGS(push_opcode_string)
opcode_t *ignored;
STRING * const s = io->image;
const size_t len = PF_size_string(v) * sizeof (opcode_t);
const size_t used = s->bufused;
op_check_size(interp, s, len);
ignored = PF_store_string((opcode_t *)((ptrcast_t)s->strstart + used), v);
UNUSED(ignored);
s->bufused += len;
s->strlen += len;
}
/*
=item C<static void push_opcode_pmc(PARROT_INTERP, IMAGE_IO *io, PMC* v)>
Pushes the PMC C<*v> onto the end of the C<*io> "stream".
=cut
*/
static void
push_opcode_pmc(PARROT_INTERP, ARGIN(IMAGE_IO *io), ARGIN(PMC* v))
{
ASSERT_ARGS(push_opcode_pmc)
UINTVAL size = sizeof (opcode_t);
STRING *op = Parrot_str_new_init(interp, (char *)&v, size,
Parrot_fixed_8_encoding_ptr, Parrot_binary_charset_ptr, 0);
io->image = Parrot_str_append(interp, io->image, op);
}
/*
=item C<static INTVAL shift_opcode_integer(PARROT_INTERP, IMAGE_IO *io)>
Removes and returns an integer from the start of the C<*io> "stream".
=cut
*/
static INTVAL
shift_opcode_integer(SHIM_INTERP, ARGIN(IMAGE_IO *io))
{
ASSERT_ARGS(shift_opcode_integer)
const char * const start = (char *)io->image->strstart;
char **opcode = &io->image->strstart;
const INTVAL i = PF_fetch_integer(io->pf,
(const opcode_t **)opcode);
io->image->bufused -= ((char *)io->image->strstart - start);
io->image->strlen -= ((char *)io->image->strstart - start);
PARROT_ASSERT((int)io->image->bufused >= 0);
return i;
}
/*
=item C<static PMC* shift_opcode_pmc(PARROT_INTERP, IMAGE_IO *io)>
Removes and returns an PMC from the start of the C<*io> "stream".
Note that this actually reads a PMC id, not a PMC.
=cut
*/
PARROT_WARN_UNUSED_RESULT
PARROT_CAN_RETURN_NULL
static PMC*
shift_opcode_pmc(PARROT_INTERP, ARGIN(IMAGE_IO *io))
{
ASSERT_ARGS(shift_opcode_pmc)
INTVAL i = shift_opcode_integer(interp, io);
return (PMC *)i;
}
/*
=item C<static FLOATVAL shift_opcode_number(PARROT_INTERP, IMAGE_IO *io)>
Removes and returns an number from the start of the C<*io> "stream".
=cut
*/
static FLOATVAL
shift_opcode_number(SHIM_INTERP, ARGIN(IMAGE_IO *io))
{
ASSERT_ARGS(shift_opcode_number)
const char * const start = (const char *)io->image->strstart;
char **opcode = &io->image->strstart;
const FLOATVAL f = PF_fetch_number(io->pf,
(const opcode_t **)opcode);
io->image->bufused -= ((char *)io->image->strstart - start);
io->image->strlen -= ((char *)io->image->strstart - start);
PARROT_ASSERT((int)io->image->bufused >= 0);
return f;
}
/*
=item C<static STRING* shift_opcode_string(PARROT_INTERP, IMAGE_IO *io)>
Removes and returns a string from the start of the C<*io> "stream".
=cut
*/
PARROT_WARN_UNUSED_RESULT
PARROT_CANNOT_RETURN_NULL
static STRING*
shift_opcode_string(PARROT_INTERP, ARGIN(IMAGE_IO *io))
{
ASSERT_ARGS(shift_opcode_string)
char * const start = (char*)io->image->strstart;
char * opcode = io->image->strstart;
STRING * const s = PF_fetch_string(interp, io->pf,
(const opcode_t **)&opcode);
io->image->strstart = opcode;
io->image->bufused -= (opcode - start);
io->image->strlen -= (opcode - start);
PARROT_ASSERT((int)io->image->bufused >= 0);
return s;
}
/*
=back
=head2 Helper Functions
=over 4
=cut
*/
/*
* this function setup stuff may be replaced by a real PMC
* in the future
* TODO add read/write header functions, e.g. vtable->init_pmc
*/
static image_funcs opcode_funcs = {
push_opcode_integer,
push_opcode_pmc,
push_opcode_string,
push_opcode_number,
shift_opcode_integer,
shift_opcode_pmc,
shift_opcode_string,
shift_opcode_number
};
/*
=item C<static void ft_init(PARROT_INTERP, visit_info *info)>
Initializes the freeze/thaw subsystem.
=cut
*/
static void
ft_init(PARROT_INTERP, ARGIN(visit_info *info))
{
ASSERT_ARGS(ft_init)
STRING *s = info->image;
PackFile *pf;
/* We want to store a 16-byte aligned header, but the actual
* header may be shorter. */
const unsigned int header_length = PACKFILE_HEADER_BYTES +
(PACKFILE_HEADER_BYTES % 16 ?
16 - PACKFILE_HEADER_BYTES % 16 : 0);
info->image_io = mem_allocate_typed(IMAGE_IO);
info->image_io->image = s = info->image;
info->image_io->vtable = &opcode_funcs;
pf = info->image_io->pf = PackFile_new(interp, 0);
if (info->what == VISIT_FREEZE_NORMAL
|| info->what == VISIT_FREEZE_AT_DESTRUCT) {
op_check_size(interp, s, header_length);
mem_sys_memcopy(s->strstart, pf->header, PACKFILE_HEADER_BYTES);
s->bufused += header_length;
s->strlen += header_length;
}
else {
if (Parrot_str_byte_length(interp, s) < header_length) {
Parrot_ex_throw_from_c_args(interp, NULL,
EXCEPTION_INVALID_STRING_REPRESENTATION,
"bad string to thaw");
}
/* TT #749: use the validation logic from Packfile_unpack */
if (pf->header->bc_major != PARROT_PBC_MAJOR
|| pf->header->bc_minor != PARROT_PBC_MINOR)
Parrot_ex_throw_from_c_args(interp, NULL,
EXCEPTION_INVALID_STRING_REPRESENTATION,
"can't thaw a PMC from Parrot %d.%d", pf->header->bc_major,
pf->header->bc_minor);
mem_sys_memcopy(pf->header, s->strstart, PACKFILE_HEADER_BYTES);
PackFile_assign_transforms(pf);
s->bufused -= header_length;
s->strlen -= header_length;
LVALUE_CAST(char *, s->strstart) += header_length;
}
info->last_type = -1;
info->id_list = pmc_new(interp, enum_class_Array);
info->id = 0;
info->extra_flags = EXTRA_IS_NULL;
info->container = NULL;
}
/*
=item C<static void todo_list_init(PARROT_INTERP, visit_info *info)>
Initializes the C<*info> lists.
=cut
*/
static void
todo_list_init(PARROT_INTERP, ARGOUT(visit_info *info))
{
ASSERT_ARGS(todo_list_init)
info->visit_pmc_now = visit_todo_list;
info->visit_pmc_later = add_pmc_todo_list;
/* we must use PMCs here so that they get marked properly */
info->todo = pmc_new(interp, enum_class_Array);
info->seen = pmc_new(interp, enum_class_Hash);
VTABLE_set_pointer(interp, info->seen, parrot_new_intval_hash(interp));
ft_init(interp, info);
}
/*
=item C<static void freeze_pmc(PARROT_INTERP, PMC *pmc, visit_info *info, int
seen, UINTVAL id)>
Freeze PMC, setting type, seen, and "same-as-last" indicators as
appropriate.
=cut
*/
PARROT_INLINE
static void
freeze_pmc(PARROT_INTERP, ARGIN_NULLOK(PMC *pmc), ARGIN(visit_info *info),
int seen, UINTVAL id)
{
ASSERT_ARGS(freeze_pmc)
IMAGE_IO * const io = info->image_io;
INTVAL type;
if (PMC_IS_NULL(pmc)) {
/* NULL + seen bit */
VTABLE_push_pmc(interp, io, (PMC*) 1);
return;
}
type = pmc->vtable->base_type;
if (PObj_is_object_TEST(pmc))
type = enum_class_Object;
/* TODO: get rid of these magic numbers; they look like pointer tags */
if (seen) {
if (info->extra_flags) {
id |= 3;
VTABLE_push_pmc(interp, io, (PMC *)id);
VTABLE_push_integer(interp, io, info->extra_flags);
return;
}
id |= 1; /* mark bit 0 if this PMC is known */
}
else if (type == info->last_type)
id |= 2; /* mark bit 1 and don't write type */
VTABLE_push_pmc(interp, io, (PMC*)id);
if (! (id & 3)) { /* else write type */
VTABLE_push_integer(interp, io, type);
info->last_type = type;
}
}
/*
=item C<static int thaw_pmc(PARROT_INTERP, visit_info *info, UINTVAL *id, INTVAL
*type)>
Freeze and thaw a PMC (id).
For example, the ASCII representation of the C<Array>
P0 = [P1=666, P2=777, P0]
may look like this:
0xdf4 30 3 0xdf8 33 666 0xdf2 777 0xdf5
where 30 is C<class_enum_Array>, 33 is C<class_enum_Integer>, the
type of the second C<Integer> is suppressed, the repeated P0 has bit 0
set.
=cut
*/
PARROT_INLINE
static int
thaw_pmc(PARROT_INTERP, ARGMOD(visit_info *info),
ARGOUT(UINTVAL *id), ARGOUT(INTVAL *type))
{
ASSERT_ARGS(thaw_pmc)
IMAGE_IO * const io = info->image_io;
PMC *n = VTABLE_shift_pmc(interp, io);
int seen = 0;
info->extra_flags = EXTRA_IS_NULL;
/* pmc has extra data */
if (((UINTVAL) n & 3) == 3) {
info->extra_flags = VTABLE_shift_integer(interp, io);
}
/* seen PMCs have bit 0 set */
else if ((UINTVAL) n & 1) {
seen = 1;
}
/* prev PMC was same type */
else if ((UINTVAL) n & 2) {
*type = info->last_type;
}
/* type follows */
else {
*type = VTABLE_shift_integer(interp, io);
info->last_type = *type;
if (*type <= 0)
Parrot_ex_throw_from_c_args(interp, NULL, 1,
"Unknown PMC type to thaw %d", (int) *type);
/* that ought to be a class */
if (*type >= interp->n_vtable_max || !interp->vtables[*type])
*type = enum_class_Class;
}
*id = (UINTVAL)n;
return seen;
}
/*
=item C<static void do_action(PARROT_INTERP, PMC *pmc, visit_info *info, int
seen, UINTVAL id)>
Called from C<visit_todo_list()> to perform the action specified in
C<< info->what >>.
Currently only C<VISIT_FREEZE_NORMAL> and C<VISIT_FREEZE_AT_DESTRUCT> are
implemented.
=cut
*/
PARROT_INLINE
static void
do_action(PARROT_INTERP, ARGIN_NULLOK(PMC *pmc), ARGIN(visit_info *info),
int seen, UINTVAL id)
{
ASSERT_ARGS(do_action)
switch (info->what) {
case VISIT_FREEZE_AT_DESTRUCT:
case VISIT_FREEZE_NORMAL:
freeze_pmc(interp, pmc, info, seen, id);
if (pmc)
info->visit_action = pmc->vtable->freeze;
break;
default:
Parrot_ex_throw_from_c_args(interp, NULL, 1, "Illegal action %ld",
(long)info->what);
}
}
/*
=item C<static PMC* thaw_create_pmc(PARROT_INTERP, const visit_info *info,
INTVAL type)>
Called from C<do_thaw()> to attach the vtable etc. to C<*pmc>.
=cut
*/
PARROT_INLINE
PARROT_CANNOT_RETURN_NULL
static PMC*
thaw_create_pmc(PARROT_INTERP, ARGIN(const visit_info *info),
INTVAL type)
{
ASSERT_ARGS(thaw_create_pmc)
PMC *pmc;
switch (info->what) {
case VISIT_THAW_NORMAL:
pmc = pmc_new_noinit(interp, type);
break;
case VISIT_THAW_CONSTANTS:
pmc = constant_pmc_new_noinit(interp, type);
break;
default:
Parrot_ex_throw_from_c_args(interp, NULL, 1,
"Illegal visit_next type");
}
return pmc;
}
/*
=item C<static void do_thaw(PARROT_INTERP, PMC *pmc, visit_info *info)>
Called by C<visit_todo_list_thaw()> to thaw and return a PMC.
C<seen> is false if this is the first time the PMC has been encountered.
=cut
*/
PARROT_INLINE
static void
do_thaw(PARROT_INTERP, ARGIN_NULLOK(PMC *pmc), ARGIN(visit_info *info))
{
ASSERT_ARGS(do_thaw)
PMC **pos;
/* set below, but avoid compiler warning */
UINTVAL id = 0;
INTVAL type = 0;
int must_have_seen = thaw_pmc(interp, info, &id, &type);
id >>= 2;
if (!id) {
/* got a NULL PMC */
pmc = PMCNULL;
if (!info->thaw_result)
info->thaw_result = pmc;
else
*info->thaw_ptr = pmc;
return;
}
pos = (PMC **)Parrot_pmc_array_get(interp, (List *)PMC_data(info->id_list),
id, enum_type_PMC);
if (pos == (void *)-1)
pos = NULL;
else if (pos) {
pmc = *(PMC **)pos;
if (!pmc)
pos = NULL;
}
if (pos) {
if (info->extra_flags == EXTRA_IS_PROP_HASH) {
interp->vtables[enum_class_default]->thaw(interp, pmc, info);
return;
}
/* else maybe VTABLE_thaw ... but there is no other extra stuff */
PARROT_ASSERT(must_have_seen);
*info->thaw_ptr = pmc;
return;
}
PARROT_ASSERT(!must_have_seen);
pmc = thaw_create_pmc(interp, info, type);
VTABLE_thaw(interp, pmc, info);
if (info->extra_flags == EXTRA_CLASS_EXISTS) {
pmc = (PMC *)info->extra;
info->extra = NULL;
info->extra_flags = 0;
}
if (!info->thaw_result)
info->thaw_result = pmc;
else
*info->thaw_ptr = pmc;
Parrot_pmc_array_assign(interp, (List *)PMC_data(info->id_list), id, pmc, enum_type_PMC);
/* remember nested aggregates depth first */
Parrot_pmc_array_unshift(interp, (List *)PMC_data(info->todo), pmc, enum_type_PMC);
}
/*
=item C<static void add_pmc_todo_list(PARROT_INTERP, PMC *pmc, visit_info
*info)>
Remembers the PMC to be processed later.
=cut
*/
static void
add_pmc_todo_list(PARROT_INTERP, ARGIN_NULLOK(PMC *pmc), ARGIN(visit_info *info))
{
ASSERT_ARGS(add_pmc_todo_list)
Parrot_pmc_array_push(interp, (List *)PMC_data(info->todo), pmc, enum_type_PMC);
}
/*
=item C<static int todo_list_seen(PARROT_INTERP, PMC *pmc, visit_info *info,
UINTVAL *id)>
Returns true if the PMC was seen, otherwise it put it on the todo list.
Generates an ID (tag) for PMC, offset by 4 as are addresses. Low bits are
flags.
=cut
*/
PARROT_INLINE
static int
todo_list_seen(PARROT_INTERP, ARGIN(PMC *pmc), ARGMOD(visit_info *info),
ARGOUT(UINTVAL *id))
{
ASSERT_ARGS(todo_list_seen)
HashBucket * const b =
parrot_hash_get_bucket(interp,
(Hash *)VTABLE_get_pointer(interp, info->seen), pmc);
if (b) {
*id = (UINTVAL) b->value;
return 1;
}
/* next id to freeze */
info->id += 4;
*id = info->id;
parrot_hash_put(interp,
(Hash *)VTABLE_get_pointer(interp, info->seen), pmc, (void *)*id);
/* remember containers */
Parrot_pmc_array_unshift(interp, (List *)PMC_data(info->todo), pmc, enum_type_PMC);
return 0;
}
/*