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273 lines
10 KiB
OpenEdge ABL
273 lines
10 KiB
OpenEdge ABL
[TypenameInstruction::] The Typename Construct.
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Defining the typename construct.
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@h Definition.
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For what this does and why it is used, see //inter: Textual Inter//.
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=
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void TypenameInstruction::define_construct(void) {
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inter_construct *IC = InterInstruction::create_construct(TYPENAME_IST, I"typename");
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InterInstruction::defines_symbol_in_fields(IC, DEFN_TYPENAME_IFLD, -1);
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InterInstruction::specify_syntax(IC, I"typename IDENTIFIER TOKEN TOKENS");
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InterInstruction::data_extent_at_least(IC, 7);
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InterInstruction::permit(IC, INSIDE_PLAIN_PACKAGE_ICUP);
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METHOD_ADD(IC, CONSTRUCT_READ_MTID, TypenameInstruction::read);
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METHOD_ADD(IC, CONSTRUCT_TRANSPOSE_MTID, TypenameInstruction::transpose);
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METHOD_ADD(IC, CONSTRUCT_VERIFY_MTID, TypenameInstruction::verify);
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METHOD_ADD(IC, CONSTRUCT_WRITE_MTID, TypenameInstruction::write);
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}
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@h Instructions.
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In bytecode, the frame of a |typename| instruction is laid out with the
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compulsory words -- see //Inter Nodes// -- followed by these. The eventual
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length is flexible: there can be any number of operands from 0 upwards.
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@d DEFN_TYPENAME_IFLD (DATA_IFLD + 0)
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@d ENUM_RANGE_TYPENAME_IFLD (DATA_IFLD + 1)
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@d NO_INSTANCES_TYPENAME_IFLD (DATA_IFLD + 2)
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@d SUPER_TYPENAME_IFLD (DATA_IFLD + 3)
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@d PERM_LIST_TYPENAME_IFLD (DATA_IFLD + 4)
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@d PLIST_TYPENAME_IFLD (DATA_IFLD + 5)
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@d CONSTRUCTOR_TYPENAME_IFLD (DATA_IFLD + 6)
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@d OPERANDS_TYPENAME_IFLD (DATA_IFLD + 7)
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=
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inter_error_message *TypenameInstruction::new(inter_bookmark *IBM, inter_symbol *typename_s,
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inter_ti constructor, inter_symbol *super_s,
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int arity, inter_ti *operands, inter_ti level, inter_error_location *eloc) {
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inter_ti super_SID = 0;
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if (super_s) super_SID = InterSymbolsTable::id_at_bookmark(IBM, super_s);
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inter_package *pack = InterBookmark::package(IBM);
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inter_warehouse *warehouse = InterBookmark::warehouse(IBM);
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inter_tree_node *P = Inode::new_with_7_data_fields(IBM, TYPENAME_IST,
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/* DEFN_TYPENAME_IFLD: */ InterSymbolsTable::id_at_bookmark(IBM, typename_s),
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/* ENUM_RANGE_TYPENAME_IFLD: */ 0,
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/* NO_INSTANCES_TYPENAME_IFLD: */ 0,
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/* SUPER_TYPENAME_IFLD: */ super_SID,
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/* PERM_LIST_TYPENAME_IFLD: */ InterWarehouse::create_node_list(warehouse, pack),
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/* PLIST_TYPENAME_IFLD: */ InterWarehouse::create_node_list(warehouse, pack),
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/* CONSTRUCTOR_TYPENAME_IFLD: */ constructor,
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eloc, level);
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if (arity > 0) {
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Inode::extend_instruction_by(P, (inter_ti) arity);
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for (int i=0; i<arity; i++)
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P->W.instruction[OPERANDS_TYPENAME_IFLD+i] = operands[i];
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}
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inter_error_message *E = VerifyingInter::instruction(InterBookmark::package(IBM), P);
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if (E) return E;
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NodePlacement::move_to_moving_bookmark(P, IBM);
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return NULL;
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}
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void TypenameInstruction::transpose(inter_construct *IC, inter_tree_node *P,
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inter_ti *grid, inter_ti grid_extent, inter_error_message **E) {
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P->W.instruction[PERM_LIST_TYPENAME_IFLD] = grid[P->W.instruction[PERM_LIST_TYPENAME_IFLD]];
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P->W.instruction[PLIST_TYPENAME_IFLD] = grid[P->W.instruction[PLIST_TYPENAME_IFLD]];
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}
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@ Verification consists only of sanity checks.
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=
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void TypenameInstruction::verify(inter_construct *IC, inter_tree_node *P,
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inter_package *owner, inter_error_message **E) {
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inter_symbol *typename_s = TypenameInstruction::typename(P);
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if ((P->W.instruction[ENUM_RANGE_TYPENAME_IFLD] > 0) &&
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(InterTypes::is_enumerated(InterTypes::from_type_name(typename_s)) == FALSE)) {
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*E = Inode::error(P, I"spurious extent in non-enumeration", NULL);
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return;
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}
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if (P->W.instruction[SUPER_TYPENAME_IFLD] != 0) {
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*E = VerifyingInter::SID_field(owner, P, SUPER_TYPENAME_IFLD, TYPENAME_IST);
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if (*E) return;
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inter_symbol *super_s = TypenameInstruction::super(typename_s);
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if (InterTypes::is_enumerated(InterTypes::from_type_name(super_s)) == FALSE) {
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*E = Inode::error(P, I"subtype of nonenumerated type", NULL);
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return;
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}
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}
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*E = VerifyingInter::node_list_field(owner, P, PERM_LIST_TYPENAME_IFLD);
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if (*E) return;
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*E = VerifyingInter::node_list_field(owner, P, PLIST_TYPENAME_IFLD);
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if (*E) return;
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*E = VerifyingInter::constructor_field(P, CONSTRUCTOR_TYPENAME_IFLD);
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if (*E) return;
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inter_type type =
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InterTypes::from_constructor_code(TypenameInstruction::constructor(typename_s));
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int arity = P->W.extent - OPERANDS_TYPENAME_IFLD;
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for (int i=0; i<arity; i++) {
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*E = VerifyingInter::TID_field(owner, P, OPERANDS_TYPENAME_IFLD + i);
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if (*E) return;
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}
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if (InterTypes::arity_is_possible(type, arity) == FALSE) {
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text_stream *err = Str::new();
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WRITE_TO(err, "typename definition has arity %d, which is impossible for ", arity);
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InterTypes::write_type(err, type);
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*E = Inode::error(P, err, NULL);
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return;
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}
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}
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@h Creating from textual Inter syntax.
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=
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void TypenameInstruction::read(inter_construct *IC, inter_bookmark *IBM,
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inter_line_parse *ilp, inter_error_location *eloc, inter_error_message **E) {
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text_stream *typename_text = ilp->mr.exp[0];
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text_stream *operator_text = ilp->mr.exp[1];
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text_stream *defn_text = ilp->mr.exp[2];
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inter_symbol *symb =
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TextualInter::new_symbol(eloc, InterBookmark::scope(IBM), typename_text, E);
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if (*E) return;
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inter_semisimple_type_description parsed_description;
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InterTypes::initialise_isstd(&parsed_description);
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inter_symbol *super_s = NULL;
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if (Str::eq(operator_text, I"<=")) {
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super_s = TextualInter::find_symbol(IBM, eloc, defn_text, TYPENAME_IST, E);
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if ((*E == NULL) &&
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(InterTypes::is_enumerated(InterTypes::from_type_name(super_s)) == FALSE)) {
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*E = InterErrors::quoted(I"not a type which can have subtypes", defn_text, eloc);
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return;
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}
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parsed_description.constructor_code = ENUM_ITCONC;
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parsed_description.arity = 0;
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} else if (Str::eq(operator_text, I"=")) {
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*E = InterTypes::parse_semisimple(ilp->mr.exp[2], InterBookmark::scope(IBM),
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eloc, &parsed_description);
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} else {
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*E = InterErrors::quoted(I"expected '=' or '<='", operator_text, eloc);
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}
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if (*E == NULL)
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*E = TypenameInstruction::new(IBM, symb, parsed_description.constructor_code,
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super_s, parsed_description.arity, parsed_description.operand_TIDs,
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(inter_ti) ilp->indent_level, eloc);
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InterTypes::dispose_of_isstd(&parsed_description);
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}
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@h Writing to textual Inter syntax.
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=
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void TypenameInstruction::write(inter_construct *IC, OUTPUT_STREAM, inter_tree_node *P) {
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inter_symbol *typename_s = TypenameInstruction::typename(P);
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WRITE("typename %S ", InterSymbol::identifier(typename_s));
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inter_symbol *super = TypenameInstruction::super(typename_s);
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if (super) {
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WRITE("<= %S", InterSymbol::identifier(super));
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} else {
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WRITE("= ");
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InterTypes::write_typename_definition(OUT, typename_s);
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}
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SymbolAnnotation::write_annotations(OUT, P, typename_s);
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}
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@h Access functions.
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=
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inter_symbol *TypenameInstruction::typename(inter_tree_node *P) {
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if (P == NULL) return NULL;
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if (Inode::isnt(P, TYPENAME_IST)) return NULL;
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return InterSymbolsTable::symbol_from_ID_at_node(P, DEFN_TYPENAME_IFLD);
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}
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inter_symbol *TypenameInstruction::super(inter_symbol *typename_s) {
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if (typename_s == NULL) return NULL;
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inter_tree_node *D = InterSymbol::definition(typename_s);
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if (D == NULL) return NULL;
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return InterSymbolsTable::symbol_from_ID_at_node(D, SUPER_TYPENAME_IFLD);
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}
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inter_node_list *TypenameInstruction::permissions_list(inter_symbol *typename_s) {
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if (typename_s == NULL) return NULL;
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inter_tree_node *D = InterSymbol::definition(typename_s);
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if (D == NULL) return NULL;
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return Inode::ID_to_frame_list(D, D->W.instruction[PERM_LIST_TYPENAME_IFLD]);
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}
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inter_node_list *TypenameInstruction::properties_list(inter_symbol *typename_s) {
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if (typename_s == NULL) return NULL;
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inter_tree_node *D = InterSymbol::definition(typename_s);
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if (D == NULL) return NULL;
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return Inode::ID_to_frame_list(D, D->W.instruction[PLIST_TYPENAME_IFLD]);
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}
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@ The definition of the semisimple type:
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=
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inter_ti TypenameInstruction::constructor(inter_symbol *typename_s) {
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if (typename_s == NULL) return UNCHECKED_ITCONC;
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inter_tree_node *D = InterSymbol::definition(typename_s);
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if (D == NULL) return UNCHECKED_ITCONC;
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return D->W.instruction[CONSTRUCTOR_TYPENAME_IFLD];
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}
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int TypenameInstruction::arity(inter_symbol *typename_s) {
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if (typename_s == NULL) return 0;
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inter_tree_node *D = InterSymbol::definition(typename_s);
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if (D == NULL) return 0;
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return D->W.extent - OPERANDS_TYPENAME_IFLD;
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}
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inter_type TypenameInstruction::operand_type(inter_symbol *typename_s, int i) {
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if (typename_s == NULL) return InterTypes::unchecked();
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inter_tree_node *D = InterSymbol::definition(typename_s);
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if (D == NULL) return InterTypes::unchecked();
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if (i >= D->W.extent - OPERANDS_TYPENAME_IFLD) return InterTypes::unchecked();
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inter_ti TID = D->W.instruction[OPERANDS_TYPENAME_IFLD + i];
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inter_symbols_table *T = InterPackage::scope_of(D);
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return InterTypes::from_TID(T, TID);
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}
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@ Enumeration counter, relevant only when the typename is enumerated:
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=
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inter_ti TypenameInstruction::next_enumerated_value(inter_symbol *typename_s) {
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if (typename_s == NULL) return 0;
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inter_tree_node *D = InterSymbol::definition(typename_s);
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if (D == NULL) return 0;
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return ++(D->W.instruction[ENUM_RANGE_TYPENAME_IFLD]);
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}
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@ For an enumerated typename, if a new instance is created, this is called:
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=
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void TypenameInstruction::new_instance(inter_symbol *typename_s, inter_symbol *inst_name) {
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if (typename_s == NULL) return;
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inter_tree_node *D = InterSymbol::definition(typename_s);
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if (D == NULL) return;
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D->W.instruction[NO_INSTANCES_TYPENAME_IFLD]++;
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inter_symbol *S = TypenameInstruction::super(typename_s);
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if (S) TypenameInstruction::new_instance(S, inst_name);
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}
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int TypenameInstruction::instance_count(inter_symbol *typename_s) {
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if (typename_s == NULL) return 0;
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inter_tree_node *D = InterSymbol::definition(typename_s);
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if (D == NULL) return 0;
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return (int) D->W.instruction[NO_INSTANCES_TYPENAME_IFLD];
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}
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@h Two tests.
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=
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int TypenameInstruction::is(inter_symbol *typename_s) {
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if (typename_s == NULL) return FALSE;
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inter_tree_node *D = InterSymbol::definition(typename_s);
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if (Inode::is(D, TYPENAME_IST)) return TRUE;
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return FALSE;
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}
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int TypenameInstruction::is_a(inter_symbol *typename1_s, inter_symbol *typename2_s) {
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inter_type type1 = InterTypes::from_type_name(typename1_s);
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inter_type type2 = InterTypes::from_type_name(typename2_s);
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if ((InterTypes::is_unchecked(type1)) || (InterTypes::is_unchecked(type2)))
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return TRUE;
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while (typename1_s) {
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if (typename1_s == typename2_s) return TRUE;
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typename1_s = TypenameInstruction::super(typename1_s);
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}
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return FALSE;
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}
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