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185 lines
7.3 KiB
OpenEdge ABL
185 lines
7.3 KiB
OpenEdge ABL
[InstanceInstruction::] The Instance Construct.
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Defining the instance 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 InstanceInstruction::define_construct(void) {
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inter_construct *IC = InterInstruction::create_construct(INSTANCE_IST, I"instance");
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InterInstruction::defines_symbol_in_fields(IC, DEFN_INST_IFLD, TYPE_INST_IFLD);
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InterInstruction::specify_syntax(IC, I"instance TOKEN TOKENS");
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InterInstruction::data_extent_always(IC, 6);
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InterInstruction::permit(IC, INSIDE_PLAIN_PACKAGE_ICUP);
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METHOD_ADD(IC, CONSTRUCT_READ_MTID, InstanceInstruction::read);
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METHOD_ADD(IC, CONSTRUCT_TRANSPOSE_MTID, InstanceInstruction::transpose);
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METHOD_ADD(IC, CONSTRUCT_VERIFY_MTID, InstanceInstruction::verify);
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METHOD_ADD(IC, CONSTRUCT_XREF_MTID, InstanceInstruction::xref);
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METHOD_ADD(IC, CONSTRUCT_WRITE_MTID, InstanceInstruction::write);
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}
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@h Instructions.
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In bytecode, the frame of an |instance| instruction is laid out with the
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compulsory words -- see //Inter Nodes// -- followed by:
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@d DEFN_INST_IFLD (DATA_IFLD + 0)
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@d TYPE_INST_IFLD (DATA_IFLD + 1)
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@d VAL1_INST_IFLD (DATA_IFLD + 2)
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@d VAL2_INST_IFLD (DATA_IFLD + 3)
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@d PROP_LIST_INST_IFLD (DATA_IFLD + 4)
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@d PERM_LIST_INST_IFLD (DATA_IFLD + 5)
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=
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inter_error_message *InstanceInstruction::new(inter_bookmark *IBM, inter_symbol *S,
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inter_symbol *typename_s, inter_pair val, inter_ti level, inter_error_location *eloc) {
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inter_warehouse *warehouse = InterBookmark::warehouse(IBM);
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inter_package *pack = InterBookmark::package(IBM);
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inter_tree_node *P = Inode::new_with_6_data_fields(IBM, INSTANCE_IST,
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/* DEFN_INST_IFLD: */ InterSymbolsTable::id_at_bookmark(IBM, S),
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/* TYPE_INST_IFLD: */ InterSymbolsTable::id_at_bookmark(IBM, typename_s),
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/* VAL1_INST_IFLD: */ InterValuePairs::to_word1(val),
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/* VAL2_INST_IFLD: */ InterValuePairs::to_word2(val),
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/* PROP_LIST_INST_IFLD: */ InterWarehouse::create_node_list(warehouse, pack),
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/* PERM_LIST_INST_IFLD: */ InterWarehouse::create_node_list(warehouse, pack),
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eloc, level);
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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 InstanceInstruction::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[PROP_LIST_INST_IFLD] = grid[P->W.instruction[PROP_LIST_INST_IFLD]];
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P->W.instruction[PERM_LIST_INST_IFLD] = grid[P->W.instruction[PERM_LIST_INST_IFLD]];
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InterValuePairs::set(P, VAL1_INST_IFLD,
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InterValuePairs::transpose(InterValuePairs::get(P, VAL1_INST_IFLD), grid, grid_extent, E));
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}
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@ Verification does more than making sanity checks: it also calculates and sets
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the enumerated value of the instance (if it is not already set), and notifies
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the typename_s that it has a new instance.
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=
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void InstanceInstruction::verify(inter_construct *IC, inter_tree_node *P, inter_package *owner,
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inter_error_message **E) {
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*E = VerifyingInter::SID_field(owner, P, TYPE_INST_IFLD, TYPENAME_IST);
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if (*E) return;
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*E = VerifyingInter::node_list_field(owner, P, PROP_LIST_INST_IFLD);
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if (*E) return;
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*E = VerifyingInter::node_list_field(owner, P, PERM_LIST_INST_IFLD);
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if (*E) return;
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}
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void InstanceInstruction::xref(inter_construct *IC, inter_tree_node *P,
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inter_error_message **E) {
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inter_symbol *typename_s = InterSymbolsTable::symbol_from_ID_at_node(P, TYPE_INST_IFLD);
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inter_type inst_type = InterTypes::from_type_name(typename_s);
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if (InterTypes::is_enumerated(inst_type)) {
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if (InterValuePairs::is_undef(InterValuePairs::get(P, VAL1_INST_IFLD)))
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InterValuePairs::set(P, VAL1_INST_IFLD,
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InterValuePairs::number(TypenameInstruction::next_enumerated_value(typename_s)));
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} else {
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*E = Inode::error(P, I"not a kind which has instances", NULL); return;
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}
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inter_package *owner = Inode::get_package(P);
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*E = VerifyingInter::data_pair_fields(owner, P, VAL1_INST_IFLD, inst_type);
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if (*E) return;
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inter_symbol *instance_s = InstanceInstruction::instance(P);
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TypenameInstruction::new_instance(typename_s, instance_s);
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}
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@h Creating from textual Inter syntax.
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=
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void InstanceInstruction::read(inter_construct *IC, inter_bookmark *IBM, inter_line_parse *ilp,
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inter_error_location *eloc, inter_error_message **E) {
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text_stream *type_text = ilp->mr.exp[0];
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text_stream *instance_text = ilp->mr.exp[1];
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inter_type inst_type = InterTypes::unchecked();
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@<Find the enumerated type this will belong to@>;
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inter_symbol *instance_s = NULL;
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inter_pair val = InterValuePairs::undef();
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@<Find the instance name and enumerated value, if given@>;
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*E = InstanceInstruction::new(IBM, instance_s, InterTypes::type_name(inst_type),
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val, (inter_ti) ilp->indent_level, eloc);
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}
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@<Find the enumerated type this will belong to@> =
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match_results mr = Regexp::create_mr();
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if (Regexp::match(&mr, type_text, L"%((%c+)%)"))
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inst_type = InterTypes::parse_simple(InterBookmark::scope(IBM), eloc, mr.exp[0], E);
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Regexp::dispose_of(&mr);
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if (*E) return;
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@<Find the instance name and enumerated value, if given@> =
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text_stream *value_text = NULL;
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match_results mr = Regexp::create_mr();
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if (Regexp::match(&mr, instance_text, L"(%i+) = (%c+)")) {
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instance_text = mr.exp[0]; value_text = mr.exp[1];
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}
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instance_s =
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TextualInter::new_symbol(eloc, InterBookmark::scope(IBM), instance_text, E);
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if ((*E == NULL) && (Str::len(value_text) > 0))
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*E = TextualInter::parse_pair(ilp->line, eloc, IBM, InterTypes::unchecked(),
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value_text, &val);
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Regexp::dispose_of(&mr);
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if (*E) return;
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@h Writing to textual Inter syntax.
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=
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void InstanceInstruction::write(inter_construct *IC, OUTPUT_STREAM, inter_tree_node *P) {
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inter_symbol *instance_s = InstanceInstruction::instance(P);
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WRITE("instance (");
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TextualInter::write_symbol_from(OUT, P, TYPE_INST_IFLD);
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WRITE(") %S = ", InterSymbol::identifier(instance_s));
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TextualInter::write_pair(OUT, P, InterValuePairs::get(P, VAL1_INST_IFLD));
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}
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@h Access functions.
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=
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inter_symbol *InstanceInstruction::instance(inter_tree_node *P) {
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if (P == NULL) return NULL;
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if (Inode::isnt(P, INSTANCE_IST)) return NULL;
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return InterSymbolsTable::symbol_from_ID_at_node(P, DEFN_INST_IFLD);
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}
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int InstanceInstruction::is(inter_symbol *instance_s) {
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if (instance_s == NULL) return FALSE;
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inter_tree_node *D = InterSymbol::definition(instance_s);
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if (Inode::is(D, INSTANCE_IST)) return TRUE;
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return FALSE;
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}
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inter_symbol *InstanceInstruction::typename(inter_symbol *instance_s) {
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return InterTypes::type_name(InterTypes::of_symbol(instance_s));
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}
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inter_pair InstanceInstruction::enumerated_value(inter_symbol *instance_s) {
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if (instance_s == NULL) return InterValuePairs::undef();
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inter_tree_node *D = InterSymbol::definition(instance_s);
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if (D == NULL) return InterValuePairs::undef();
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return InterValuePairs::get(D, VAL1_INST_IFLD);
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}
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inter_node_list *InstanceInstruction::permissions_list(inter_symbol *instance_s) {
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if (instance_s == NULL) return NULL;
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inter_tree_node *D = InterSymbol::definition(instance_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_INST_IFLD]);
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}
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inter_node_list *InstanceInstruction::properties_list(inter_symbol *instance_s) {
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if (instance_s == NULL) return NULL;
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inter_tree_node *D = InterSymbol::definition(instance_s);
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if (D == NULL) return NULL;
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return Inode::ID_to_frame_list(D, D->W.instruction[PROP_LIST_INST_IFLD]);
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}
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