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69 lines
2.2 KiB
OpenEdge ABL
69 lines
2.2 KiB
OpenEdge ABL
[CodeInstruction::] The Code Construct.
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Defining the Code 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 CodeInstruction::define_construct(void) {
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inter_construct *IC = InterInstruction::create_construct(CODE_IST, I"code");
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InterInstruction::specify_syntax(IC, I"code");
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InterInstruction::data_extent_always(IC, 0);
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InterInstruction::allow_in_depth_range(IC, 0, INFINITELY_DEEP);
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InterInstruction::permit(IC, INSIDE_CODE_PACKAGE_ICUP);
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InterInstruction::permit(IC, CAN_HAVE_CHILDREN_ICUP);
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METHOD_ADD(IC, CONSTRUCT_READ_MTID, CodeInstruction::read);
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METHOD_ADD(IC, CONSTRUCT_WRITE_MTID, CodeInstruction::write);
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METHOD_ADD(IC, CONSTRUCT_VERIFY_CHILDREN_MTID, CodeInstruction::verify_children);
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}
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@h Instructions.
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In bytecode, the frame of a |code| instruction is laid out with just the two
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compulsory words -- see //Inter Nodes//.
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=
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inter_error_message *CodeInstruction::new(inter_bookmark *IBM, int level,
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inter_error_location *eloc) {
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inter_tree_node *P = Inode::new_with_0_data_fields(IBM, CODE_IST,
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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 CodeInstruction::verify_children(inter_construct *IC, inter_tree_node *P,
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inter_error_message **E) {
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LOOP_THROUGH_INTER_CHILDREN(C, P) {
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if ((C->W.instruction[0] != INV_IST) &&
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(C->W.instruction[0] != SPLAT_IST) &&
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(C->W.instruction[0] != EVALUATION_IST) &&
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(C->W.instruction[0] != LABEL_IST) &&
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(C->W.instruction[0] != VAL_IST) &&
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(C->W.instruction[0] != COMMENT_IST) &&
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(C->W.instruction[0] != NOP_IST)) {
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*E = Inode::error(C, I"only executable matter can be below a code", NULL);
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return;
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}
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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 CodeInstruction::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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*E = CodeInstruction::new(IBM, ilp->indent_level, eloc);
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}
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@h Writing to textual Inter syntax.
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=
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void CodeInstruction::write(inter_construct *IC, OUTPUT_STREAM, inter_tree_node *P) {
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WRITE("code");
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}
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