tighten xbasic64’s GW-BASIC/QuickBASIC compatibility - #12

Merged

jgarzik merged 29 commits into

masterfrom

updates

Aug 16, 2026

Commits on Aug 16, 2026

Take every statement after THEN in a single-line IF

jgarzik
and
claude
committed
8fb9f27
Accept a line number after THEN and ELSE as an implied GOTO

jgarzik
and
claude
committed
d01b915
Refuse a DO loop that tests its condition at both ends

jgarzik
and
claude
committed
5374bdc
Stop guessing at a bad line number, and drop three lexer oddities

jgarzik
and
claude
committed
4e25a3c
Bound recursion depth instead of overflowing the stack

jgarzik
and
claude
committed
606c1c1
Carry block terminators in the return type, not the error channel

jgarzik
and
claude
committed
ae4aad4
Quote BASIC in diagnostics, not Rust variant names

jgarzik
and
claude
committed
75303bd
Report every syntax error, not just the first

jgarzik
and
claude
committed
c3790b6
Resolve array-versus-call in sema, not by guessing in the parser

jgarzik
and
claude
committed
0b87d2c
State the identifier uppercase invariant once, and check it

jgarzik
and
claude
committed
b27ac31
Build assembly text in place: 17% faster, 20% less memory

jgarzik
and
claude
committed
801471c
Hoist the duplicated field-path loop, and fuzz the front end

jgarzik
and
claude
committed
bcec60a
Make the bitwise operators actually bitwise

jgarzik
and
claude
committed
cea534d
Make operator precedence match LANGREF's own table

jgarzik
and
claude
committed
a2d1aef
Check the NEXT control variable, and let one NEXT close several loops

jgarzik
and
claude
committed
1a9e89c
Take DATA items as written, not as tokens

jgarzik
and
claude
committed
6176bde
Convert a numeric DATA item when it is READ into a string

jgarzik
and
claude
committed
3474922
Print the question mark INPUT was always documented to print

jgarzik
and
claude
committed
4269a39
Four front-end fixes: overflow, continuation, THEN-colon, cascades

jgarzik
and
claude
committed
e991aa8
Diagnose RETURN without GOSUB, and accept CALL

jgarzik
and
claude
committed
0afba49
Guard the file helpers that hand a NULL handle to libc

jgarzik
and
claude
committed
4800a34
Report the file errors that were being swallowed

jgarzik
and
claude
committed
acf4d76
Fix the Windows job, and stop the tests littering the repo root

jgarzik
and
claude
committed
1ba3d69
Narrow the value when READ, INPUT or SWAP stores it

jgarzik
and
claude
committed
537dcf6
Make STRING * n actually fixed-length

jgarzik
and
claude
committed
f16aa0f
Reject arguments the string and power builtins cannot answer

jgarzik
and
claude
committed
34ea3e5
Range-check CHR$, SPACE$ and STRING$, and make DIM's suffix agree with AS

jgarzik
and
claude
committed
b2007d3
Align the stack in the MID$ and INSTR call sequences

jgarzik
and
claude
committed
1566b42
Widen the generated-code alignment check

jgarzik
and
claude
committed
9677865

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tighten xbasic64’s GW-BASIC/QuickBASIC compatibility - #12

tighten xbasic64’s GW-BASIC/QuickBASIC compatibility #12
jgarzik merged 29 commits into
masterfrom
updates

Commits on Aug 16, 2026

Take every statement after THEN in a single-line IF

Accept a line number after THEN and ELSE as an implied GOTO

Refuse a DO loop that tests its condition at both ends

Stop guessing at a bad line number, and drop three lexer oddities

Bound recursion depth instead of overflowing the stack

Carry block terminators in the return type, not the error channel

Quote BASIC in diagnostics, not Rust variant names

Report every syntax error, not just the first

Resolve array-versus-call in sema, not by guessing in the parser

State the identifier uppercase invariant once, and check it

Build assembly text in place: 17% faster, 20% less memory

Hoist the duplicated field-path loop, and fuzz the front end

Make the bitwise operators actually bitwise

Make operator precedence match LANGREF's own table

Check the NEXT control variable, and let one NEXT close several loops

Take DATA items as written, not as tokens

Convert a numeric DATA item when it is READ into a string

Print the question mark INPUT was always documented to print

Four front-end fixes: overflow, continuation, THEN-colon, cascades

Diagnose RETURN without GOSUB, and accept CALL

Guard the file helpers that hand a NULL handle to libc

Report the file errors that were being swallowed

Fix the Windows job, and stop the tests littering the repo root

Narrow the value when READ, INPUT or SWAP stores it

Make STRING * n actually fixed-length

Reject arguments the string and power builtins cannot answer

Range-check CHR$, SPACE$ and STRING$, and make DIM's suffix agree with AS

Align the stack in the MID$ and INSTR call sequences

Widen the generated-code alignment check