// Returns true iff the given identifier corresponds to a fragment that is
// ready to be bound and hasn't already been bound.
static bool should_fragment_be_bound(binding_context_t *context, value_t schedule,
value_t ident) {
// This fragment is already scheduled so we definitely don't want to bind it
// again.
if (is_fragment_scheduled(schedule, ident))
return false;
// Grab the information we hold about the fragment.
value_t path = get_identifier_path(ident);
value_t stage = get_identifier_stage(ident);
value_t module = get_id_hash_map_at(context->fragment_entry_map, path);
value_t entry = get_id_hash_map_at(module, stage);
value_t imports = get_fragment_entry_imports(entry);
// Check whether all its explicit dependencies are satisfied.
for (size_t i = 0; i < get_array_buffer_length(imports); i++) {
value_t import = get_array_buffer_at(imports, i);
if (!is_fragment_scheduled(schedule, import))
return false;
}
// Check if there is a preceding fragment and whether it has been bound.
value_t entry_before = get_fragment_entry_before(module, stage);
if (in_condition_cause(ccNotFound, entry_before)) {
return true;
} else {
value_t before_ident = get_fragment_entry_identifier(entry_before);
return is_fragment_scheduled(schedule, before_ident);
}
}
value_t module_loader_lookup_module(value_t self, value_t path) {
value_t modules = get_module_loader_modules(self);
value_t result = get_id_hash_map_at(modules, path);
if (in_condition_cause(ccNotFound, result))
WARN("Module %v not found.", path);
return result;
}
// Creates and binds modules and fragments according to the given schedule.
static value_t execute_binding_schedule(binding_context_t *context, value_t schedule) {
runtime_t *runtime = get_ambience_runtime(context->ambience);
for (size_t i = 0; i < get_array_buffer_length(schedule); i++) {
value_t next = get_array_buffer_at(schedule, i);
TOPIC_INFO(Library, "About to bind %v", next);
value_t path = get_identifier_path(next);
value_t stage = get_identifier_stage(next);
// Create the bound module if it doesn't already exist.
value_t bound_module = get_id_hash_map_at(context->bound_module_map, path);
if (in_condition_cause(ccNotFound, bound_module)) {
TRY_SET(bound_module, new_heap_empty_module(runtime, path));
TRY(set_id_hash_map_at(runtime, context->bound_module_map, path,
bound_module));
}
// Create the bound fragment.
value_t bound_fragment = get_module_fragment_at(bound_module, stage);
if (in_condition_cause(ccNotFound, bound_fragment)) {
TRY_SET(bound_fragment, new_empty_module_fragment(runtime, stage,
bound_module));
TRY(add_module_fragment(runtime, bound_module, bound_fragment));
} else {
// An earlier phase needed a reference to this fragment so it has already
// been created but not initialized yet.
CHECK_EQ("Unexpected phase", get_module_fragment_epoch(bound_fragment),
feUninitialized);
TRY(init_empty_module_fragment(runtime, bound_fragment));
set_module_fragment_epoch(bound_fragment, feUnbound);
}
if (is_present_core(runtime, next)) {
// TODO: this is a hack, there should be some other mechanism for
// identifying the core module. This way of binding it also means it
// gets bound at a time that's not particularly well-defined which is
// also an issue.
TOPIC_INFO(Library, "Binding present core to %v", bound_fragment);
set_ambience_present_core_fragment(context->ambience, bound_fragment);
}
// Grab the unbound fragment we'll use to create the bound fragment.
value_t module_entries = get_id_hash_map_at(context->fragment_entry_map, path);
value_t fragment_entry = get_id_hash_map_at(module_entries, stage);
// Bind the fragment based on the data from the entry.
TRY(bind_module_fragment(context, fragment_entry, bound_fragment));
TOPIC_INFO(Library, "Done binding %v", next);
}
return success();
}
value_t get_type_parents(runtime_t *runtime, value_t space, value_t type) {
value_t inheritance = get_methodspace_inheritance(space);
value_t parents = get_id_hash_map_at(inheritance, type);
if (in_condition_cause(ccNotFound, parents)) {
return ROOT(runtime, empty_array_buffer);
} else {
return parents;
}
}
static value_t new_instance_of_string(runtime_t *runtime, value_t type) {
value_t factories = ROOT(runtime, plankton_factories);
value_t factory = get_id_hash_map_at(factories, type);
if (in_family(ofFactory, factory)) {
value_t new_instance_wrapper = get_factory_new_instance(factory);
void *new_instance_ptr = get_void_p_value(new_instance_wrapper);
factory_new_instance_t *new_instance = (factory_new_instance_t*) (intptr_t) new_instance_ptr;
return new_instance(runtime);
} else {
return new_heap_seed(runtime, type, nothing());
}
}
// Checks whether a fragment entry for the given stage and path already exists
// and if not creates it.
static value_t binding_context_ensure_fragment_entry(binding_context_t *context,
value_t stage, value_t path, value_t fragment, bool *created) {
CHECK_PHYLUM(tpStageOffset, stage);
CHECK_FAMILY(ofPath, path);
CHECK_FAMILY_OPT(ofUnboundModuleFragment, fragment);
value_t path_map = context->fragment_entry_map;
runtime_t *runtime = get_ambience_runtime(context->ambience);
if (!has_id_hash_map_at(path_map, path)) {
TRY_DEF(stage_map, new_heap_id_hash_map(runtime, 16));
TRY(set_id_hash_map_at(runtime, path_map, path, stage_map));
}
value_t stage_map = get_id_hash_map_at(path_map, path);
if (!has_id_hash_map_at(stage_map, stage)) {
TRY_DEF(imports, new_heap_array_buffer(runtime, 4));
TRY_DEF(ident, new_heap_identifier(runtime, stage, path));
TRY_DEF(entry, new_heap_triple(runtime, fragment, imports, ident));
TRY(set_id_hash_map_at(runtime, stage_map, stage, entry));
*created = true;
}
return get_id_hash_map_at(stage_map, stage);
}
static value_t set_heap_object_contents_with_utf8_type(runtime_t *runtime,
value_t object, value_t header, value_t payload) {
value_t factories = ROOT(runtime, plankton_factories);
value_t factory = get_id_hash_map_at(factories, header);
if (in_family(ofFactory, factory)) {
value_t set_contents_wrapper = get_factory_set_contents(factory);
void *set_contents_ptr = get_void_p_value(set_contents_wrapper);
factory_set_contents_t *set_contents = (factory_set_contents_t*) (intptr_t) set_contents_ptr;
return set_contents(object, runtime, payload);
} else {
set_seed_payload(object, payload);
return success();
}
}
// Performs a lookup for a single symbol scope.
static value_t map_scope_lookup(map_scope_o *self, value_t symbol,
binding_info_t *info_out) {
value_t value = get_id_hash_map_at(self->map, symbol);
if (in_condition_cause(ccNotFound, value)) {
return scope_lookup(self->outer, symbol, info_out);
} else {
if (info_out != NULL) {
binding_info_codec_t codec;
codec.encoded = get_integer_value(value);
*info_out = codec.decoded;
}
return success();
}
}
value_t build_bound_module(value_t ambience, value_t unbound_module) {
runtime_t *runtime = get_ambience_runtime(ambience);
binding_context_t context;
binding_context_init(&context, ambience);
TRY_SET(context.bound_module_map, new_heap_id_hash_map(runtime, 16));
TRY_DEF(modules, build_transitive_module_array(runtime, unbound_module));
TRY(build_fragment_entry_map(&context, modules));
TRY_DEF(schedule, build_binding_schedule(&context));
TRY(execute_binding_schedule(&context, schedule));
value_t path = get_unbound_module_path(unbound_module);
value_t result = get_id_hash_map_at(context.bound_module_map, path);
CHECK_FALSE("module missing", in_condition_cause(ccNotFound, result));
return result;
}
value_t get_or_create_methodspace_selector_slice(runtime_t *runtime, value_t self,
value_t selector) {
value_t cache_ptr = get_methodspace_cache_ptr(self);
value_t cache = get_freeze_cheat_value(cache_ptr);
// Create the cache if it doesn't exist.
if (is_nothing(cache)) {
TRY_SET(cache, new_heap_id_hash_map(runtime, 128));
set_freeze_cheat_value(cache_ptr, cache);
}
// Create the selector-specific cache if it doesn't exits.
value_t slice = get_id_hash_map_at(cache, selector);
if (in_condition_cause(ccNotFound, slice)) {
TRY_SET(slice, create_methodspace_selector_slice(runtime, self, selector));
TRY(set_id_hash_map_at(runtime, cache, selector, slice));
}
return slice;
}
value_t add_methodspace_inheritance(runtime_t *runtime, value_t self,
value_t subtype, value_t supertype) {
CHECK_FAMILY(ofMethodspace, self);
CHECK_MUTABLE(self);
CHECK_FAMILY(ofType, subtype);
CHECK_FAMILY(ofType, supertype);
value_t inheritance = get_methodspace_inheritance(self);
value_t parents = get_id_hash_map_at(inheritance, subtype);
if (in_condition_cause(ccNotFound, parents)) {
// Make the parents buffer small since most types don't have many direct
// parents. If this fails nothing has happened.
TRY_SET(parents, new_heap_array_buffer(runtime, 4));
// If this fails we've wasted some space allocating the parents array but
// otherwise nothing has happened.
TRY(set_id_hash_map_at(runtime, inheritance, subtype, parents));
}
// If this fails we may have set the parents array of the subtype to an empty
// array which is awkward but okay.
invalidate_methodspace_caches(self);
return add_to_array_buffer(runtime, parents, supertype);
}
// Adds mappings in the namespace and imports in the methodspace for everything
// imported by the given fragment.
static value_t bind_module_fragment_imports(binding_context_t *context,
value_t imports, value_t bound_fragment) {
// Import the modules spaces into this fragment and create bindings in the
// importspace.
value_t methodspace = get_module_fragment_methodspace(bound_fragment);
value_t importspace = get_module_fragment_imports(bound_fragment);
runtime_t *runtime = get_ambience_runtime(context->ambience);
for (size_t i = 0; i < get_array_buffer_length(imports); i++) {
// Look up the imported module.
value_t import_ident = get_array_buffer_at(imports, i);
value_t import_path = get_identifier_path(import_ident);
value_t import_head = get_path_head(import_path);
value_t import_stage = get_identifier_stage(import_ident);
value_t import_module = get_id_hash_map_at(context->bound_module_map, import_path);
value_t import_fragment = get_module_fragment_at(import_module, import_stage);
CHECK_TRUE("import not bound", is_module_fragment_bound(import_fragment));
value_t import_methods = get_module_fragment_methodspace(import_fragment);
TRY(add_methodspace_import(runtime, methodspace, import_methods));
TRY(set_id_hash_map_at(runtime, importspace, import_head,
import_fragment));
}
return success();
}
// Add synthetic fragment entries corresponding to imported fragments where
// there is no real fragment to import the fragment into.
static value_t build_synthetic_fragment_entries(binding_context_t *context) {
// Keep adding synthetic modules as long as changes are being made to the
// map. We'll scan through the fragments currently in the map, then scan
// through their imports, and for each check that the fragment that should
// receive the import exists. If it doesn't it is created.
loop: do {
id_hash_map_iter_t module_iter;
id_hash_map_iter_init(&module_iter, context->fragment_entry_map);
while (id_hash_map_iter_advance(&module_iter)) {
value_t module_path;
value_t module_fragments;
// Scan through the fragments.
id_hash_map_iter_get_current(&module_iter, &module_path, &module_fragments);
id_hash_map_iter_t fragment_iter;
id_hash_map_iter_init(&fragment_iter, module_fragments);
while (id_hash_map_iter_advance(&fragment_iter)) {
value_t stage;
value_t entry;
id_hash_map_iter_get_current(&fragment_iter, &stage, &entry);
value_t unbound_fragment = get_fragment_entry_fragment(entry);
// If there is no fragment associated with this entry it is synthetic
// and hence we're done.
if (is_nothing(unbound_fragment))
continue;
// Scan through the fragment's imports and ensure that their import
// targets have been created.
value_t imports = get_fragment_entry_imports(entry);
for (size_t i = 0; i < get_array_buffer_length(imports); i++) {
value_t import = get_array_buffer_at(imports, i);
value_t import_fragment_stage = get_identifier_stage(import);
if (!value_identity_compare(import_fragment_stage, present_stage()))
// We'll record past imports but ignore them for the purposes of
// closing the import map since they're redundant.
continue;
value_t import_module_path = get_identifier_path(import);
value_t import_module = get_id_hash_map_at(context->fragment_entry_map,
import_module_path);
// Scan through the fragments of the imported module.
id_hash_map_iter_t imported_fragment_iter;
id_hash_map_iter_init(&imported_fragment_iter, import_module);
bool has_changed_anything = false;
while (id_hash_map_iter_advance(&imported_fragment_iter)) {
value_t import_stage;
value_t import_entry;
id_hash_map_iter_get_current(&imported_fragment_iter,
&import_stage, &import_entry);
value_t target_stage = add_stage_offsets(import_stage, stage);
// Ensure that there is a target entry to add the import to. If it
// already exists this is a no-op, if it doesn't a synthetic entry
// is created.
TRY_DEF(target_entry, binding_context_ensure_fragment_entry(
context, target_stage, module_path, nothing(),
&has_changed_anything));
value_t target_imports = get_fragment_entry_imports(target_entry);
value_t import_ident = get_fragment_entry_identifier(import_entry);
if (!in_array_buffer(target_imports, import_ident)) {
has_changed_anything = true;
TRY(add_to_array_buffer(get_ambience_runtime(context->ambience),
target_imports, import_ident));
}
}
// If any changes were made we have to start over.
if (has_changed_anything)
goto loop;
}
}
}
} while (false);
return success();
}