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92 lines
3.1 KiB
OpenEdge ABL
92 lines
3.1 KiB
OpenEdge ABL
[RefInstruction::] The Ref Construct.
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Defining the ref 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 RefInstruction::define_construct(void) {
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inter_construct *IC = InterInstruction::create_construct(REF_IST, I"ref");
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InterInstruction::specify_syntax(IC, I"ref TOKENS");
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InterInstruction::data_extent_always(IC, 3);
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InterInstruction::allow_in_depth_range(IC, 1, INFINITELY_DEEP);
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InterInstruction::permit(IC, INSIDE_CODE_PACKAGE_ICUP);
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METHOD_ADD(IC, CONSTRUCT_READ_MTID, RefInstruction::read);
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METHOD_ADD(IC, CONSTRUCT_VERIFY_MTID, RefInstruction::verify);
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METHOD_ADD(IC, CONSTRUCT_WRITE_MTID, RefInstruction::write);
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}
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@h Instructions.
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In bytecode, the frame of a |ref| instruction is laid out with the
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compulsory words -- see //Inter Nodes// -- followed by:
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@d TYPE_REF_IFLD (DATA_IFLD + 0)
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@d VAL1_REF_IFLD (DATA_IFLD + 1)
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@d VAL2_REF_IFLD (DATA_IFLD + 2)
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=
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inter_error_message *RefInstruction::new(inter_bookmark *IBM, inter_type ref_type,
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int level, inter_pair val, inter_error_location *eloc) {
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inter_tree_node *P = Inode::new_with_3_data_fields(IBM, REF_IST,
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/* TYPE_REF_IFLD: */ InterTypes::to_TID_at(IBM, ref_type),
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/* VAL1_REF_IFLD: */ InterValuePairs::to_word1(val),
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/* VAL2_REF_IFLD: */ InterValuePairs::to_word2(val),
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eloc, (inter_ti) 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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@ Verification consists only of sanity checks.
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=
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void RefInstruction::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::TID_field(owner, P, TYPE_REF_IFLD);
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if (*E) return;
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inter_type type = InterTypes::from_TID_in_field(P, TYPE_REF_IFLD);
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*E = VerifyingInter::data_pair_fields(owner, P, VAL1_REF_IFLD, type);
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if (*E) return;
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}
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@h Creating from textual Inter syntax.
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=
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void RefInstruction::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 = NULL, *value_text = ilp->mr.exp[0];
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match_results mr = Regexp::create_mr();
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if (Regexp::match(&mr, value_text, L"%((%c+)%) (%c+)")) {
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type_text = mr.exp[0];
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value_text = mr.exp[1];
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}
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inter_pair val = InterValuePairs::undef();
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inter_type ref_type = InterTypes::parse_simple(InterBookmark::scope(IBM), eloc, type_text, E);
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if (*E == NULL)
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*E = TextualInter::parse_pair(ilp->line, eloc, IBM, ref_type, value_text, &val);
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Regexp::dispose_of(&mr);
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if (*E) return;
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*E = RefInstruction::new(IBM, ref_type, ilp->indent_level, val, eloc);
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}
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@h Writing to textual Inter syntax.
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=
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void RefInstruction::write(inter_construct *IC, OUTPUT_STREAM, inter_tree_node *P) {
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WRITE("ref ");
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TextualInter::write_optional_type_marker(OUT, P, TYPE_REF_IFLD);
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TextualInter::write_pair(OUT, P, RefInstruction::value(P));
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}
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@h Access function.
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=
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inter_pair RefInstruction::value(inter_tree_node *P) {
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if (P == NULL) return InterValuePairs::undef();
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if (Inode::isnt(P, REF_IST)) return InterValuePairs::undef();
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return InterValuePairs::get(P, VAL1_REF_IFLD);
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}
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