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2026-07-26refactor: centralize libc declarations, move '&' concat into StringHandler_ov4
CodeGen declares its own MallocFunc in SetupExternalFunctions and uses it for char->STRING coercion and INPUT STRING buffers, removing two bare getFunction("malloc") calls that null-deref'd if no handler happened to declare malloc first. The CHR branch reuses the char->STRING coercion path instead of a second hand-rolled heap wrapper. String concatenation moves from ArithmeticHandler (which re-declared four externs per '&' and was the LLVM 19 build-pin root cause) to StringHandler::emitConcat; ArithmeticHandler no longer touches the Module. Dead FreeFunc declarations removed. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
2026-07-26refactor: batch 1 - correctness and error contract_ov4
- MID/RIGHT/LEFT integer args now coerced at call sites (RIGHT(s, n/2) no longer emits invalid IR); drop emitLeft's private conversion - FOR loop direction decided at run time via select on STEP sign; descending FOR works, STEP evaluated once per iteration - ArrayHandler: extract emitCheckedIndices/loadElement; index count is validated before emission, fixing a compiler-crash (vector OOB UB) on OUTPUT with too many indices - Error contract: Lexer/Parser/CodeGen track errors; all silent failure paths now print Error: diagnostics with line numbers; unterminated char literal no longer truncates the rest of the program; module is verified with verifyModule; driver exits non-zero on any error Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
2026-03-03Added all built-in functions_ov4
2026-02-02Added logical operators_ov4
2026-02-02Added REAL and BOOLEAN types, DIV and MOD operators_ov4