Implement ahead-of-time compiler (Phase 1): BASIC to C via token stream

evv/gw-basic-2026

New tool gwbasic-compile translates tokenized .bas programs to C source,
which gcc compiles into native executables linked against libgwrt.a (the
interpreter's runtime modules minus the execution loop).

Pipeline: .bas → gw_crunch() → analysis pass (line table, variable census,
GOTO targets, DATA collection) → C codegen → gcc → native executable.

Phase 1 supports: PRINT, LET, IF/THEN/ELSE, GOTO, GOSUB/RETURN, FOR/NEXT,
END/STOP/SYSTEM, REM, DATA/READ/RESTORE, CLS, arithmetic/relational/logical
operators, core math functions (SIN, COS, SQR, ABS, etc.), string functions
(LEFT$, RIGHT$, MID$, CHR$, ASC, VAL, STR$, LEN, etc.), string concatenation.

All control flow uses goto/labels (no C for/while) so GOTO into loops works.
GOSUB uses a return-label stack with switch dispatch.

This commit is contained in:

Eremey Valetov

2026-03-29 06:59:42 -04:00

parent eaa1166d8c

commit d3b57d9f3b

9 changed files with 1871 additions and 2 deletions

									
										include/codegen.h
									
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				#ifndef CODEGEN_H

				#define CODEGEN_H

				#include "analysis.h"

				#include <stdio.h>

				/* Generate C source from the analyzed program */

				void codegen_emit(FILE *out, analysis_t *a);

				#endif