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gperl-i11n-invoke-c.c
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gperl-i11n-invoke-c.c
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/* -*- mode: c; indent-tabs-mode: t; c-basic-offset: 8; -*- */
static void _prepare_c_invocation_info (GPerlI11nCInvocationInfo *iinfo,
GICallableInfo *info,
IV items,
UV internal_stack_offset,
const gchar *package,
const gchar *namespace,
const gchar *function);
static void _clear_c_invocation_info (GPerlI11nCInvocationInfo *iinfo);
static void _check_n_args (GPerlI11nCInvocationInfo *iinfo);
static void _handle_automatic_arg (guint pos,
GIArgInfo * arg_info,
GITypeInfo * arg_type,
GIArgument * arg,
GPerlI11nCInvocationInfo * invocation_info);
static gpointer _allocate_out_mem (GITypeInfo *arg_type);
static void
invoke_c_code (GICallableInfo *info,
gpointer func_pointer,
SV **sp, I32 ax, SV **mark, I32 items, /* these correspond to dXSARGS */
UV internal_stack_offset,
const gchar *package,
const gchar *namespace,
const gchar *function)
{
ffi_cif cif;
gpointer instance = NULL;
guint i;
GPerlI11nCInvocationInfo iinfo;
guint n_return_values;
#if GI_CHECK_VERSION (1, 32, 0)
GIFFIReturnValue ffi_return_value;
#endif
gpointer return_value_p;
GIArgument return_value;
GError * local_error = NULL;
gpointer local_error_address = &local_error;
PERL_UNUSED_VAR (mark);
_prepare_c_invocation_info (&iinfo, info, items, internal_stack_offset,
package, namespace, function);
_check_n_args (&iinfo);
if (iinfo.is_method) {
instance = instance_sv_to_pointer (info, ST (0 + iinfo.stack_offset), &iinfo.base);
iinfo.arg_types_ffi[0] = &ffi_type_pointer;
iinfo.args[0] = &instance;
}
/*
* --- handle arguments -----------------------------------------------
*/
for (i = 0 ; i < iinfo.base.n_args ; i++) {
GIArgInfo * arg_info;
GITypeInfo * arg_type;
GITransfer transfer;
gboolean may_be_null = FALSE, is_skipped = FALSE;
gint perl_stack_pos, ffi_stack_pos;
SV *current_sv;
arg_info = &(iinfo.base.arg_infos[i]);
arg_type = &(iinfo.base.arg_types[i]);
transfer = g_arg_info_get_ownership_transfer (arg_info);
may_be_null = g_arg_info_may_be_null (arg_info);
#if GI_CHECK_VERSION (1, 29, 0)
is_skipped = g_arg_info_is_skip (arg_info);
#endif
perl_stack_pos = (gint) i
+ (gint) iinfo.constructor_offset
+ (gint) iinfo.method_offset
+ (gint) iinfo.stack_offset
+ iinfo.dynamic_stack_offset;
ffi_stack_pos = (gint) i
+ (gint) iinfo.method_offset;
g_assert (perl_stack_pos >= 0 && ffi_stack_pos >= 0);
/* FIXME: Is this right? I'm confused about the relation of
* the numbers in g_callable_info_get_arg and
* g_arg_info_get_closure and g_arg_info_get_destroy. We used
* to add method_offset, but that stopped being correct at some
* point. */
iinfo.base.current_pos = i; /* + method_offset; */
dwarn ("arg %d: tag = %d (%s), is_pointer = %d, is_automatic = %d\n",
i,
g_type_info_get_tag (arg_type),
g_type_tag_to_string (g_type_info_get_tag (arg_type)),
g_type_info_is_pointer (arg_type),
iinfo.is_automatic_arg[i]);
/* Use undef for missing args (due to the checks above, these
* must be nullable). */
current_sv = perl_stack_pos < items ? ST (perl_stack_pos) : &PL_sv_undef;
switch (g_arg_info_get_direction (arg_info)) {
case GI_DIRECTION_IN:
if (iinfo.is_automatic_arg[i]) {
iinfo.dynamic_stack_offset--;
} else if (is_skipped) {
iinfo.dynamic_stack_offset--;
} else {
sv_to_arg (current_sv,
&iinfo.in_args[i], arg_info, arg_type,
transfer, may_be_null, &iinfo.base);
}
iinfo.arg_types_ffi[ffi_stack_pos] =
g_type_info_get_ffi_type (arg_type);
iinfo.args[ffi_stack_pos] = &iinfo.in_args[i];
break;
case GI_DIRECTION_OUT:
if (g_arg_info_is_caller_allocates (arg_info)) {
iinfo.base.aux_args[i].v_pointer =
_allocate_out_mem (arg_type);
iinfo.out_args[i].v_pointer = &iinfo.base.aux_args[i];
iinfo.args[ffi_stack_pos] = &iinfo.base.aux_args[i];
} else {
iinfo.out_args[i].v_pointer = &iinfo.base.aux_args[i];
iinfo.args[ffi_stack_pos] = &iinfo.out_args[i];
}
iinfo.arg_types_ffi[ffi_stack_pos] = &ffi_type_pointer;
/* Adjust the dynamic stack offset so that this out
* argument doesn't inadvertedly eat up an in argument. */
iinfo.dynamic_stack_offset--;
break;
case GI_DIRECTION_INOUT:
iinfo.in_args[i].v_pointer =
iinfo.out_args[i].v_pointer =
&iinfo.base.aux_args[i];
if (iinfo.is_automatic_arg[i]) {
iinfo.dynamic_stack_offset--;
} else if (is_skipped) {
iinfo.dynamic_stack_offset--;
} else {
/* We pass iinfo.in_args[i].v_pointer here,
* not &iinfo.in_args[i], so that the value
* pointed to is filled from the SV. */
sv_to_arg (current_sv,
iinfo.in_args[i].v_pointer, arg_info, arg_type,
transfer, may_be_null, &iinfo.base);
}
iinfo.arg_types_ffi[ffi_stack_pos] = &ffi_type_pointer;
iinfo.args[ffi_stack_pos] = &iinfo.in_args[i];
break;
}
}
/* do another pass to handle automatic args */
for (i = 0 ; i < iinfo.base.n_args ; i++) {
GIArgInfo * arg_info;
GITypeInfo * arg_type;
if (!iinfo.is_automatic_arg[i])
continue;
arg_info = &(iinfo.base.arg_infos[i]);
arg_type = &(iinfo.base.arg_types[i]);
switch (g_arg_info_get_direction (arg_info)) {
case GI_DIRECTION_IN:
_handle_automatic_arg (i, arg_info, arg_type, &iinfo.in_args[i], &iinfo);
break;
case GI_DIRECTION_INOUT:
_handle_automatic_arg (i, arg_info, arg_type, &iinfo.base.aux_args[i], &iinfo);
break;
case GI_DIRECTION_OUT:
/* handled later */
break;
}
}
if (iinfo.throws) {
iinfo.args[iinfo.n_invoke_args - 1] = &local_error_address;
iinfo.arg_types_ffi[iinfo.n_invoke_args - 1] = &ffi_type_pointer;
}
/*
* --- prepare & call -------------------------------------------------
*/
/* prepare and call the function */
if (FFI_OK != ffi_prep_cif (&cif, FFI_DEFAULT_ABI, iinfo.n_invoke_args,
iinfo.base.return_type_ffi, iinfo.arg_types_ffi))
{
_clear_c_invocation_info (&iinfo);
ccroak ("Could not prepare a call interface");
}
#if GI_CHECK_VERSION (1, 32, 0)
return_value_p = &ffi_return_value;
#else
return_value_p = &return_value;
#endif
/* Wrap the call in PUTBACK/SPAGAIN because the C function might end up
* calling Perl code (via a vfunc), which might reallocate the stack
* and hence invalidate 'sp'. */
PUTBACK;
ffi_call (&cif, func_pointer, return_value_p, iinfo.args);
SPAGAIN;
/* free call-scoped data */
invoke_free_after_call_handlers (&iinfo.base);
if (local_error) {
_clear_c_invocation_info (&iinfo);
gperl_croak_gerror (NULL, local_error);
}
/*
* --- handle return values -------------------------------------------
*/
#if GI_CHECK_VERSION (1, 32, 0)
/* libffi has special semantics for return value storage; see `man
* ffi_call`. We use gobject-introspection's extraction helper. */
gi_type_info_extract_ffi_return_value (&iinfo.base.return_type_info,
&ffi_return_value,
&return_value);
#endif
n_return_values = 0;
/* place return value and output args on the stack */
if (iinfo.base.has_return_value
#if GI_CHECK_VERSION (1, 29, 0)
&& !g_callable_info_skip_return ((GICallableInfo *) info)
#endif
)
{
SV *value;
dwarn ("return value: type = %p\n", &iinfo.base.return_type_info);
value = SAVED_STACK_SV (arg_to_sv (&return_value,
&iinfo.base.return_type_info,
iinfo.base.return_type_transfer,
GPERL_I11N_MEMORY_SCOPE_IRRELEVANT,
&iinfo.base));
if (value) {
XPUSHs (sv_2mortal (value));
n_return_values++;
}
}
/* out args */
for (i = 0 ; i < iinfo.base.n_args ; i++) {
GIArgInfo * arg_info;
if (iinfo.is_automatic_arg[i])
continue;
arg_info = &(iinfo.base.arg_infos[i]);
#if GI_CHECK_VERSION (1, 29, 0)
if (g_arg_info_is_skip (arg_info)) {
continue;
}
#endif
switch (g_arg_info_get_direction (arg_info)) {
case GI_DIRECTION_OUT:
case GI_DIRECTION_INOUT:
{
GITransfer transfer;
SV *sv;
dwarn ("out/inout arg at pos %d\n", i);
/* If we allocated the memory ourselves, we always own it. */
transfer = g_arg_info_is_caller_allocates (arg_info)
? GI_TRANSFER_CONTAINER
: g_arg_info_get_ownership_transfer (arg_info);
sv = SAVED_STACK_SV (arg_to_sv (iinfo.out_args[i].v_pointer,
&(iinfo.base.arg_types[i]),
transfer,
GPERL_I11N_MEMORY_SCOPE_IRRELEVANT,
&iinfo.base));
if (sv) {
XPUSHs (sv_2mortal (sv));
n_return_values++;
}
break;
}
default:
break;
}
}
_clear_c_invocation_info (&iinfo);
dwarn ("n_return_values = %d\n", n_return_values);
PUTBACK;
}
/* ------------------------------------------------------------------------- */
static void
_prepare_c_invocation_info (GPerlI11nCInvocationInfo *iinfo,
GICallableInfo *info,
IV items,
UV internal_stack_offset,
const gchar *package,
const gchar *namespace,
const gchar *function)
{
guint i;
prepare_invocation_info ((GPerlI11nInvocationInfo *) iinfo, info);
dwarn ("%s::%s::%s => %s\n",
package, namespace, function,
g_base_info_get_name (info));
iinfo->target_package = package;
iinfo->target_namespace = namespace;
iinfo->target_function = function;
iinfo->stack_offset = (guint) internal_stack_offset;
g_assert (items >= iinfo->stack_offset);
iinfo->n_given_args = ((guint) items) - iinfo->stack_offset;
iinfo->n_invoke_args = iinfo->base.n_args;
iinfo->is_constructor = FALSE;
if (iinfo->base.is_function) {
iinfo->is_constructor =
g_function_info_get_flags (info) & GI_FUNCTION_IS_CONSTRUCTOR;
}
/* FIXME: can a vfunc not throw? */
iinfo->throws = FALSE;
if (iinfo->base.is_function) {
iinfo->throws =
g_function_info_get_flags (info) & GI_FUNCTION_THROWS;
}
if (iinfo->throws) {
/* Add one for the implicit GError arg. */
iinfo->n_invoke_args++;
}
if (iinfo->base.is_vfunc) {
iinfo->is_method = TRUE;
} else if (iinfo->base.is_callback) {
iinfo->is_method = FALSE;
} else {
iinfo->is_method =
(g_function_info_get_flags (info) & GI_FUNCTION_IS_METHOD)
&& !iinfo->is_constructor;
}
if (iinfo->is_method) {
/* Add one for the implicit invocant arg. */
iinfo->n_invoke_args++;
}
dwarn (" args = %u, given = %u, invoke = %u\n",
iinfo->base.n_args,
iinfo->n_given_args,
iinfo->n_invoke_args);
dwarn (" symbol = %s\n",
iinfo->base.is_vfunc ? g_base_info_get_name (info) : g_function_info_get_symbol (info));
dwarn (" is_constructor = %d, is_method = %d, throws = %d\n",
iinfo->is_constructor, iinfo->is_method, iinfo->throws);
/* allocate enough space for all args in both the out and in lists.
* we'll only use as much as we need. since function argument lists
* are typically small, this shouldn't be a big problem. */
if (iinfo->n_invoke_args) {
guint n = iinfo->n_invoke_args;
iinfo->in_args = gperl_alloc_temp (sizeof (GIArgument) * n);
iinfo->out_args = gperl_alloc_temp (sizeof (GIArgument) * n);
iinfo->arg_types_ffi = gperl_alloc_temp (sizeof (ffi_type *) * n);
iinfo->args = gperl_alloc_temp (sizeof (gpointer) * n);
iinfo->is_automatic_arg = gperl_alloc_temp (sizeof (gboolean) * n);
}
/* If we call a constructor, we skip the initial package name resulting
* from the "Package->new" syntax. If we call a method, we handle the
* invocant separately. */
iinfo->constructor_offset = iinfo->is_constructor ? 1 : 0;
iinfo->method_offset = iinfo->is_method ? 1 : 0;
iinfo->dynamic_stack_offset = 0;
/* Make a first pass to mark args that are filled in automatically, and
* thus have no counterpart on the Perl side. */
for (i = 0 ; i < iinfo->base.n_args ; i++) {
GIArgInfo * arg_info = &(iinfo->base.arg_infos[i]);
GITypeInfo * arg_type = &(iinfo->base.arg_types[i]);
GITypeTag arg_tag = g_type_info_get_tag (arg_type);
if (arg_tag == GI_TYPE_TAG_ARRAY) {
gint pos = g_type_info_get_array_length (arg_type);
if (pos >= 0) {
dwarn (" pos %d is automatic (array length)\n", pos);
iinfo->is_automatic_arg[pos] = TRUE;
}
}
else if (arg_tag == GI_TYPE_TAG_INTERFACE) {
GIBaseInfo * interface = g_type_info_get_interface (arg_type);
GIInfoType info_type = g_base_info_get_type (interface);
if (info_type == GI_INFO_TYPE_CALLBACK) {
gint pos = g_arg_info_get_destroy (arg_info);
if (pos >= 0) {
dwarn (" pos %d is automatic (callback destroy notify)\n", pos);
iinfo->is_automatic_arg[pos] = TRUE;
}
}
g_base_info_unref ((GIBaseInfo *) interface);
}
}
/* Make another pass to count the expected args. */
iinfo->n_expected_args = iinfo->constructor_offset + iinfo->method_offset;
iinfo->n_nullable_args = 0;
for (i = 0 ; i < iinfo->base.n_args ; i++) {
GIArgInfo * arg_info = &(iinfo->base.arg_infos[i]);
GITypeInfo * arg_type = &(iinfo->base.arg_types[i]);
GITypeTag arg_tag = g_type_info_get_tag (arg_type);
gboolean is_out = GI_DIRECTION_OUT == g_arg_info_get_direction (arg_info);
gboolean is_automatic = iinfo->is_automatic_arg[i];
gboolean is_skipped = FALSE;
#if GI_CHECK_VERSION (1, 29, 0)
is_skipped = g_arg_info_is_skip (arg_info);
#endif
if (!is_out && !is_automatic && !is_skipped)
iinfo->n_expected_args++;
/* Callback user data may always be NULL. */
if (g_arg_info_may_be_null (arg_info) || arg_tag == GI_TYPE_TAG_VOID)
iinfo->n_nullable_args++;
}
/* If the return value is an array which comes with an outbound length
* arg, then mark that length arg as automatic, too. */
if (g_type_info_get_tag (&iinfo->base.return_type_info) == GI_TYPE_TAG_ARRAY) {
gint pos = g_type_info_get_array_length (&iinfo->base.return_type_info);
if (pos >= 0) {
GIArgInfo * arg_info = &(iinfo->base.arg_infos[pos]);
if (GI_DIRECTION_OUT == g_arg_info_get_direction (arg_info)) {
dwarn (" pos %d is automatic (array length)\n", pos);
iinfo->is_automatic_arg[pos] = TRUE;
}
}
}
/* We need to undo the special handling that GInitiallyUnowned
* descendants receive from gobject-introspection: values of this type
* are always marked transfer=none, even for constructors.
*
* FIXME: This is not correct for GtkWindow and its descendants, as
* gtk+ keeps an internal reference to each window. Hence,
* constructors like gtk_window_new return a non-floating object and do
* not pass ownership of a reference on to us. But the sink func
* currently registered for GInitiallyUnowned (sink_initially_unowned
* in GObject.xs in Glib) is actually inadvertently conforming to this
* requirement. It runs ref_sink+unref regardless of whether the
* object is floating or not. So, in the non-floating window case, it
* does nothing, resulting in an extra reference taken, despite the
* request to transfer ownership.
*
* If we ever encounter a constructor of a GInitiallyUnowned descendant
* that returns a non-floating object and passes ownership of a
* reference on to us, or a constructor of a GInitiallyUnowned
* descendant that returns a floating object but passes no reference on
* to us, then we need to revisit this. */
if (iinfo->is_constructor &&
g_type_info_get_tag (&iinfo->base.return_type_info) == GI_TYPE_TAG_INTERFACE)
{
GIBaseInfo * interface = g_type_info_get_interface (&iinfo->base.return_type_info);
if (GI_IS_REGISTERED_TYPE_INFO (interface) &&
g_type_is_a (get_gtype (interface),
G_TYPE_INITIALLY_UNOWNED))
{
iinfo->base.return_type_transfer = GI_TRANSFER_EVERYTHING;
}
g_base_info_unref ((GIBaseInfo *) interface);
}
}
static void
_clear_c_invocation_info (GPerlI11nCInvocationInfo *iinfo)
{
clear_invocation_info ((GPerlI11nInvocationInfo *) iinfo);
}
/* ------------------------------------------------------------------------- */
static gchar *
_format_target (GPerlI11nCInvocationInfo *iinfo)
{
gchar *caller = NULL;
if (iinfo->target_package && iinfo->target_namespace && iinfo->target_function) {
caller = g_strconcat (iinfo->target_package, "::",
iinfo->target_namespace, "::",
iinfo->target_function,
NULL);
} else if (iinfo->target_package && iinfo->target_function) {
caller = g_strconcat (iinfo->target_package, "::",
iinfo->target_function,
NULL);
} else {
caller = g_strconcat ("Callable ",
g_base_info_get_name (iinfo->base.interface),
NULL);
}
return caller;
}
static void
_check_n_args (GPerlI11nCInvocationInfo *iinfo)
{
if (iinfo->n_expected_args != iinfo->n_given_args) {
/* Avoid the cost of formatting the target until we know we
* need it. */
gchar *caller = NULL;
if (iinfo->n_given_args < (iinfo->n_expected_args - iinfo->n_nullable_args)) {
caller = _format_target (iinfo);
ccroak ("%s: passed too few parameters "
"(expected %u, got %u)",
caller, iinfo->n_expected_args, iinfo->n_given_args);
} else if (iinfo->n_given_args > iinfo->n_expected_args) {
caller = _format_target (iinfo);
cwarn ("*** %s: passed too many parameters "
"(expected %u, got %u); ignoring excess",
caller, iinfo->n_expected_args, iinfo->n_given_args);
}
if (caller)
g_free (caller);
}
}
/* ------------------------------------------------------------------------- */
static void
_handle_automatic_arg (guint pos,
GIArgInfo * arg_info,
GITypeInfo * arg_type,
GIArgument * arg,
GPerlI11nCInvocationInfo * invocation_info)
{
GSList *l;
/* array length */
for (l = invocation_info->base.array_infos; l != NULL; l = l->next) {
GPerlI11nArrayInfo *ainfo = l->data;
if (((gint) pos) == ainfo->length_pos) {
SV *conversion_sv;
dwarn (" setting automatic arg %d (array length) to %"G_GSIZE_FORMAT"\n",
pos, ainfo->length);
conversion_sv = newSVuv (ainfo->length);
sv_to_arg (conversion_sv, arg, arg_info, arg_type,
GI_TRANSFER_NOTHING, FALSE, NULL);
SvREFCNT_dec (conversion_sv);
return;
}
}
/* callback destroy notify */
for (l = invocation_info->base.callback_infos; l != NULL; l = l->next) {
GPerlI11nPerlCallbackInfo *cinfo = l->data;
if (((gint) pos) == cinfo->destroy_pos) {
dwarn (" setting automatic arg %d (destroy notify for calllback %p)\n",
pos, cinfo);
/* If the code pointer is NULL, then the user actually
* specified undef for the callback or nothing at all,
* in which case we must not install our destroy notify
* handler. */
arg->v_pointer = cinfo->code ? release_perl_callback : NULL;
return;
}
}
ccroak ("Could not handle automatic arg %d", pos);
}
static gpointer
_allocate_out_mem (GITypeInfo *arg_type)
{
GIBaseInfo *interface_info;
GIInfoType type;
gboolean is_boxed = FALSE;
GType gtype = G_TYPE_INVALID;
interface_info = g_type_info_get_interface (arg_type);
g_assert (interface_info);
type = g_base_info_get_type (interface_info);
if (GI_IS_REGISTERED_TYPE_INFO (interface_info)) {
gtype = get_gtype (interface_info);
is_boxed = g_type_is_a (gtype, G_TYPE_BOXED);
}
g_base_info_unref (interface_info);
switch (type) {
case GI_INFO_TYPE_STRUCT:
{
/* No plain g_struct_info_get_size (interface_info) here so
* that we get the GValue override. */
gsize size;
gpointer mem;
size = size_of_interface (arg_type);
mem = g_malloc0 (size);
if (is_boxed) {
/* For a boxed type, malloc() might not be the right
* allocator. For example, GtkTreeIter uses GSlice.
* So use g_boxed_copy() to make a copy of the newly
* allocated block using the correct allocator. */
gpointer real_mem = g_boxed_copy (gtype, mem);
g_free (mem);
mem = real_mem;
}
return mem;
}
default:
g_assert_not_reached ();
return NULL;
}
}