/* Introspects the methods. */
static void methods(MVMThreadContext *tc, MVMCallsite *callsite, MVMRegister *args) {
MVMObject *self, *type_obj, *method_table;
MVMArgProcContext arg_ctx; arg_ctx.named_used = NULL;
MVM_args_proc_init(tc, &arg_ctx, callsite, args);
self = MVM_args_get_pos_obj(tc, &arg_ctx, 0, MVM_ARG_REQUIRED).arg.o;
type_obj = MVM_args_get_pos_obj(tc, &arg_ctx, 1, MVM_ARG_REQUIRED).arg.o;
MVM_args_proc_cleanup(tc, &arg_ctx);
if (!self || !IS_CONCRETE(self) || REPR(self)->ID != MVM_REPR_ID_KnowHOWREPR)
MVM_exception_throw_adhoc(tc, "KnowHOW methods must be called on object instance with REPR KnowHOWREPR");
method_table = ((MVMKnowHOWREPR *)self)->body.methods;
MVM_args_set_result_obj(tc, method_table, MVM_RETURN_CURRENT_FRAME);
}
/* KnowHOW.new_type method. Creates a new type with this HOW as its meta-object. */
static void new_type(MVMThreadContext *tc, MVMCallsite *callsite, MVMRegister *args) {
MVMObject *self, *HOW, *type_object, *BOOTHash, *stash;
MVMArgInfo repr_arg, name_arg;
MVMString *repr_name, *name;
const MVMREPROps *repr_to_use;
MVMInstance *instance = tc->instance;
/* Get arguments. */
MVMArgProcContext arg_ctx; arg_ctx.named_used = NULL;
MVM_args_proc_init(tc, &arg_ctx, callsite, args);
MVM_args_checkarity(tc, &arg_ctx, 1, 1);
self = MVM_args_get_pos_obj(tc, &arg_ctx, 0, MVM_ARG_REQUIRED).arg.o;
repr_arg = MVM_args_get_named_str(tc, &arg_ctx, instance->str_consts.repr, MVM_ARG_OPTIONAL);
name_arg = MVM_args_get_named_str(tc, &arg_ctx, instance->str_consts.name, MVM_ARG_OPTIONAL);
MVM_args_proc_cleanup(tc, &arg_ctx);
if (REPR(self)->ID != MVM_REPR_ID_KnowHOWREPR)
MVM_exception_throw_adhoc(tc, "KnowHOW methods must be called on object with REPR KnowHOWREPR");
/* See if we have a representation name; if not default to P6opaque. */
repr_name = repr_arg.exists ? repr_arg.arg.s : instance->str_consts.P6opaque;
repr_to_use = MVM_repr_get_by_name(tc, repr_name);
MVM_gc_root_temp_push(tc, (MVMCollectable **)&name_arg);
/* We first create a new HOW instance. */
HOW = REPR(self)->allocate(tc, STABLE(self));
MVM_gc_root_temp_push(tc, (MVMCollectable **)&HOW);
/* Create a new type object of the desired REPR. (Note that we can't
* default to KnowHOWREPR here, since it doesn't know how to actually
* store attributes, it's just for bootstrapping knowhow's. */
type_object = repr_to_use->type_object_for(tc, HOW);
MVM_gc_root_temp_push(tc, (MVMCollectable **)&type_object);
/* This may move name_arg.arg.s so do it first: */
REPR(HOW)->initialize(tc, STABLE(HOW), HOW, OBJECT_BODY(HOW));
/* See if we were given a name; put it into the meta-object if so. */
name = name_arg.exists ? name_arg.arg.s : instance->str_consts.anon;
MVM_ASSIGN_REF(tc, &(HOW->header), ((MVMKnowHOWREPR *)HOW)->body.name, name);
/* Set .WHO to an empty hash. */
BOOTHash = tc->instance->boot_types.BOOTHash;
stash = REPR(BOOTHash)->allocate(tc, STABLE(BOOTHash));
MVM_gc_root_temp_push(tc, (MVMCollectable **)&stash);
MVM_ASSIGN_REF(tc, &(STABLE(type_object)->header), STABLE(type_object)->WHO, stash);
/* Return the type object. */
MVM_args_set_result_obj(tc, type_object, MVM_RETURN_CURRENT_FRAME);
MVM_gc_root_temp_pop_n(tc, 4);
}
void MVM_frame_unwind_to(MVMThreadContext *tc, MVMFrame *frame, MVMuint8 *abs_addr,
MVMuint32 rel_addr, MVMObject *return_value) {
while (tc->cur_frame != frame) {
if (tc->cur_frame->static_info->body.has_exit_handler &&
!(tc->cur_frame->flags & MVM_FRAME_FLAG_EXIT_HAND_RUN)) {
/* We're unwinding a frame with an exit handler. Thus we need to
* pause the unwind, run the exit handler, and keep enough info
* around in order to finish up the unwind afterwards. */
MVMFrame *caller = tc->cur_frame->caller;
MVMHLLConfig *hll = MVM_hll_current(tc);
MVMObject *handler;
if (!caller)
MVM_exception_throw_adhoc(tc, "Entry point frame cannot have an exit handler");
if (tc->cur_frame == tc->thread_entry_frame)
MVM_exception_throw_adhoc(tc, "Thread entry point frame cannot have an exit handler");
MVM_args_setup_thunk(tc, NULL, MVM_RETURN_VOID, &exit_arg_callsite);
tc->cur_frame->args[0].o = tc->cur_frame->code_ref;
tc->cur_frame->args[1].o = NULL;
tc->cur_frame->special_return = continue_unwind;
{
MVMUnwindData *ud = malloc(sizeof(MVMUnwindData));
ud->frame = frame;
ud->abs_addr = abs_addr;
ud->rel_addr = rel_addr;
if (return_value)
MVM_exception_throw_adhoc(tc, "return_value + exit_handler case NYI");
tc->cur_frame->special_return_data = ud;
}
tc->cur_frame->flags |= MVM_FRAME_FLAG_EXIT_HAND_RUN;
handler = MVM_frame_find_invokee(tc, hll->exit_handler, NULL);
STABLE(handler)->invoke(tc, handler, &exit_arg_callsite, tc->cur_frame->args);
return;
}
else {
/* No exit handler, so just remove the frame. */
if (!remove_one_frame(tc, 1))
MVM_panic(1, "Internal error: Unwound entire stack and missed handler");
}
}
if (abs_addr)
*tc->interp_cur_op = abs_addr;
else if (rel_addr)
*tc->interp_cur_op = *tc->interp_bytecode_start + rel_addr;
if (return_value)
MVM_args_set_result_obj(tc, return_value, 1);
}
/* Adds a method. */
static void add_method(MVMThreadContext *tc, MVMCallsite *callsite, MVMRegister *args) {
MVMObject *self, *method, *method_table;
MVMString *name;
/* Get arguments. */
MVMArgProcContext arg_ctx; arg_ctx.named_used = NULL;
MVM_args_proc_init(tc, &arg_ctx, callsite, args);
MVM_args_checkarity(tc, &arg_ctx, 4, 4);
self = MVM_args_get_pos_obj(tc, &arg_ctx, 0, MVM_ARG_REQUIRED).arg.o;
name = MVM_args_get_pos_str(tc, &arg_ctx, 2, MVM_ARG_REQUIRED).arg.s;
method = MVM_args_get_pos_obj(tc, &arg_ctx, 3, MVM_ARG_REQUIRED).arg.o;
MVM_args_proc_cleanup(tc, &arg_ctx);
if (!self || !IS_CONCRETE(self) || REPR(self)->ID != MVM_REPR_ID_KnowHOWREPR)
MVM_exception_throw_adhoc(tc, "KnowHOW methods must be called on object instance with REPR KnowHOWREPR");
/* Add to method table. */
method_table = ((MVMKnowHOWREPR *)self)->body.methods;
MVM_repr_bind_key_o(tc, method_table, name, method);
/* Return added method as result. */
MVM_args_set_result_obj(tc, method, MVM_RETURN_CURRENT_FRAME);
}
/* Adds an method. */
static void add_attribute(MVMThreadContext *tc, MVMCallsite *callsite, MVMRegister *args) {
MVMObject *self, *attr, *attributes;
/* Get arguments. */
MVMArgProcContext arg_ctx; arg_ctx.named_used = NULL;
MVM_args_proc_init(tc, &arg_ctx, callsite, args);
MVM_args_checkarity(tc, &arg_ctx, 3, 3);
self = MVM_args_get_pos_obj(tc, &arg_ctx, 0, MVM_ARG_REQUIRED).arg.o;
attr = MVM_args_get_pos_obj(tc, &arg_ctx, 2, MVM_ARG_REQUIRED).arg.o;
MVM_args_proc_cleanup(tc, &arg_ctx);
/* Ensure we have the required representations. */
if (!self || !IS_CONCRETE(self) || REPR(self)->ID != MVM_REPR_ID_KnowHOWREPR)
MVM_exception_throw_adhoc(tc, "KnowHOW methods must be called on object instance with REPR KnowHOWREPR");
if (REPR(attr)->ID != MVM_REPR_ID_KnowHOWAttributeREPR)
MVM_exception_throw_adhoc(tc, "KnowHOW attributes must use KnowHOWAttributeREPR");
/* Add to method table. */
attributes = ((MVMKnowHOWREPR *)self)->body.attributes;
MVM_repr_push_o(tc, attributes, attr);
/* Return added attribute as result. */
MVM_args_set_result_obj(tc, attr, MVM_RETURN_CURRENT_FRAME);
}
/* Composes the meta-object. */
static void compose(MVMThreadContext *tc, MVMCallsite *callsite, MVMRegister *args) {
MVMObject *self, *type_obj, *method_table, *attributes, *BOOTArray, *BOOTHash,
*repr_info_hash, *repr_info, *type_info, *attr_info_list, *parent_info;
MVMint64 num_attrs, i;
/* Get arguments. */
MVMArgProcContext arg_ctx; arg_ctx.named_used = NULL;
MVM_args_proc_init(tc, &arg_ctx, callsite, args);
self = MVM_args_get_pos_obj(tc, &arg_ctx, 0, MVM_ARG_REQUIRED).arg.o;
type_obj = MVM_args_get_pos_obj(tc, &arg_ctx, 1, MVM_ARG_REQUIRED).arg.o;
MVM_args_proc_cleanup(tc, &arg_ctx);
if (!self || !IS_CONCRETE(self) || REPR(self)->ID != MVM_REPR_ID_KnowHOWREPR)
MVM_exception_throw_adhoc(tc, "KnowHOW methods must be called on object instance with REPR KnowHOWREPR");
/* Fill out STable. */
method_table = ((MVMKnowHOWREPR *)self)->body.methods;
MVM_ASSIGN_REF(tc, STABLE(type_obj), STABLE(type_obj)->method_cache, method_table);
STABLE(type_obj)->mode_flags = MVM_METHOD_CACHE_AUTHORITATIVE;
STABLE(type_obj)->type_check_cache_length = 1;
STABLE(type_obj)->type_check_cache = malloc(sizeof(MVMObject *));
MVM_ASSIGN_REF(tc, STABLE(type_obj), STABLE(type_obj)->type_check_cache[0], type_obj);
/* Next steps will allocate, so make sure we keep hold of the type
* object and ourself. */
MVM_gc_root_temp_push(tc, (MVMCollectable **)&self);
MVM_gc_root_temp_push(tc, (MVMCollectable **)&type_obj);
/* Use any attribute information to produce attribute protocol
* data. The protocol consists of an array... */
BOOTArray = tc->instance->boot_types->BOOTArray;
BOOTHash = tc->instance->boot_types->BOOTHash;
MVM_gc_root_temp_push(tc, (MVMCollectable **)&BOOTArray);
MVM_gc_root_temp_push(tc, (MVMCollectable **)&BOOTHash);
repr_info = REPR(BOOTArray)->allocate(tc, STABLE(BOOTArray));
MVM_gc_root_temp_push(tc, (MVMCollectable **)&repr_info);
REPR(repr_info)->initialize(tc, STABLE(repr_info), repr_info, OBJECT_BODY(repr_info));
/* ...which contains an array per MRO entry (just us)... */
type_info = REPR(BOOTArray)->allocate(tc, STABLE(BOOTArray));
MVM_gc_root_temp_push(tc, (MVMCollectable **)&type_info);
REPR(type_info)->initialize(tc, STABLE(type_info), type_info, OBJECT_BODY(type_info));
MVM_repr_push_o(tc, repr_info, type_info);
/* ...which in turn contains this type... */
MVM_repr_push_o(tc, type_info, type_obj);
/* ...then an array of hashes per attribute... */
attr_info_list = REPR(BOOTArray)->allocate(tc, STABLE(BOOTArray));
MVM_gc_root_temp_push(tc, (MVMCollectable **)&attr_info_list);
REPR(attr_info_list)->initialize(tc, STABLE(attr_info_list), attr_info_list,
OBJECT_BODY(attr_info_list));
MVM_repr_push_o(tc, type_info, attr_info_list);
attributes = ((MVMKnowHOWREPR *)self)->body.attributes;
MVM_gc_root_temp_push(tc, (MVMCollectable **)&attributes);
num_attrs = REPR(attributes)->elems(tc, STABLE(attributes),
attributes, OBJECT_BODY(attributes));
for (i = 0; i < num_attrs; i++) {
MVMObject *attr_info = REPR(BOOTHash)->allocate(tc, STABLE(BOOTHash));
MVMKnowHOWAttributeREPR *attribute = (MVMKnowHOWAttributeREPR *)
MVM_repr_at_pos_o(tc, attributes, i);
MVM_gc_root_temp_push(tc, (MVMCollectable **)&attr_info);
MVM_gc_root_temp_push(tc, (MVMCollectable **)&attribute);
if (REPR((MVMObject *)attribute)->ID != MVM_REPR_ID_KnowHOWAttributeREPR)
MVM_exception_throw_adhoc(tc, "KnowHOW attributes must use KnowHOWAttributeREPR");
REPR(attr_info)->initialize(tc, STABLE(attr_info), attr_info,
OBJECT_BODY(attr_info));
REPR(attr_info)->ass_funcs->bind_key_boxed(tc, STABLE(attr_info),
attr_info, OBJECT_BODY(attr_info), (MVMObject *)str_name, (MVMObject *)attribute->body.name);
REPR(attr_info)->ass_funcs->bind_key_boxed(tc, STABLE(attr_info),
attr_info, OBJECT_BODY(attr_info), (MVMObject *)str_type, attribute->body.type);
if (attribute->body.box_target) {
/* Merely having the key serves as a "yes". */
REPR(attr_info)->ass_funcs->bind_key_boxed(tc, STABLE(attr_info),
attr_info, OBJECT_BODY(attr_info), (MVMObject *)str_box_target, attr_info);
}
MVM_repr_push_o(tc, attr_info_list, attr_info);
MVM_gc_root_temp_pop_n(tc, 2);
}
/* ...followed by a list of parents (none). */
parent_info = REPR(BOOTArray)->allocate(tc, STABLE(BOOTArray));
MVM_gc_root_temp_push(tc, (MVMCollectable **)&parent_info);
REPR(parent_info)->initialize(tc, STABLE(parent_info), parent_info,
OBJECT_BODY(parent_info));
MVM_repr_push_o(tc, type_info, parent_info);
/* Finally, this all goes in a hash under the key 'attribute'. */
repr_info_hash = REPR(BOOTHash)->allocate(tc, STABLE(BOOTHash));
MVM_gc_root_temp_push(tc, (MVMCollectable **)&repr_info_hash);
REPR(repr_info_hash)->initialize(tc, STABLE(repr_info_hash), repr_info_hash, OBJECT_BODY(repr_info_hash));
REPR(repr_info_hash)->ass_funcs->bind_key_boxed(tc, STABLE(repr_info_hash),
repr_info_hash, OBJECT_BODY(repr_info_hash), (MVMObject *)str_attribute, repr_info);
/* Compose the representation using it. */
REPR(type_obj)->compose(tc, STABLE(type_obj), repr_info_hash);
/* Clear temporary roots. */
MVM_gc_root_temp_pop_n(tc, 10);
/* Return type object. */
MVM_args_set_result_obj(tc, type_obj, MVM_RETURN_CURRENT_FRAME);
}