static value_t lambda_scope_lookup(lambda_scope_o *self, value_t symbol, binding_info_t *info_out) { size_t capture_count_before = get_array_buffer_length(self->captures); // See if we've captured this variable before. for (size_t i = 0; i < capture_count_before; i++) { value_t captured = get_array_buffer_at(self->captures, i); if (value_identity_compare(captured, symbol)) { // Found it. Record that we did if necessary and return success. if (info_out != NULL) binding_info_set(info_out, btLambdaCaptured, i, 0); return success(); } } // We haven't seen this one before so look it up outside. value_t value = scope_lookup(self->outer, symbol, info_out); if (info_out != NULL && !in_condition_cause(ccNotFound, value)) { // We found something and this is a read. Add it to the list of captures. runtime_t *runtime = self->assembler->runtime; if (get_array_buffer_length(self->captures) == 0) { // The first time we add something we have to create a new array buffer // since all empty capture scopes share the singleton empty buffer. TRY_SET(self->captures, new_heap_array_buffer(runtime, 2)); } TRY(add_to_array_buffer(runtime, self->captures, symbol)); binding_info_set(info_out, btLambdaCaptured, capture_count_before, 0); } return value; }
// 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 build_binding_schedule(binding_context_t *context) { runtime_t *runtime = get_ambience_runtime(context->ambience); TRY_DEF(schedule, new_heap_array_buffer(runtime, 16)); TRY_DEF(all_fragments, build_fragment_identifier_array(context)); loop: do { for (size_t i = 0; i < get_array_buffer_length(all_fragments); i++) { value_t ident = get_array_buffer_at(all_fragments, i); if (should_fragment_be_bound(context, schedule, ident)) { TRY(add_to_array_buffer(runtime, schedule, ident)); goto loop; } } } while (false); return schedule; }
// 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(); }
static value_t find_best_match(runtime_t *runtime, value_t current, value_t target, value_t current_score, value_t space, value_t *score_out) { if (value_identity_compare(current, target)) { *score_out = current_score; return success(); } else { TRY_DEF(parents, get_type_parents(runtime, space, current)); int64_t length = get_array_buffer_length(parents); value_t score = new_no_match_score(); for (int64_t i = 0; i < length; i++) { value_t parent = get_array_buffer_at(parents, i); value_t next_score = whatever(); TRY(find_best_match(runtime, parent, target, get_score_successor(current_score), space, &next_score)); score = best_score(score, next_score); } *score_out = score; return success(); } }
// 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(); }
// Given an array of modules map builds a two-level map from paths to stages to // fragment entries. static value_t build_real_fragment_entries(binding_context_t *context, value_t modules) { runtime_t *runtime = get_ambience_runtime(context->ambience); for (size_t mi = 0; mi < get_array_buffer_length(modules); mi++) { value_t module = get_array_buffer_at(modules, mi); value_t path = get_unbound_module_path(module); value_t fragments = get_unbound_module_fragments(module); for (size_t fi = 0; fi < get_array_length(fragments); fi++) { value_t fragment = get_array_at(fragments, fi); value_t stage = get_unbound_module_fragment_stage(fragment); bool dummy = false; TRY_DEF(entry, binding_context_ensure_fragment_entry(context, stage, path, fragment, &dummy)); value_t imports = get_fragment_entry_imports(entry); value_t fragment_imports = get_unbound_module_fragment_imports(fragment); for (size_t ii = 0; ii < get_array_length(fragment_imports); ii++) { value_t import = get_array_at(fragment_imports, ii); TRY_DEF(ident, new_heap_identifier(runtime, present_stage(), import)); TRY(ensure_array_buffer_contains(runtime, imports, ident)); } } } 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(); }