Analyze {{artifact_path}} statically. In sqlite3Fts3ExprParse, explain how a
"malformed MATCH expression" error can be selected even when its parsing helper
returns success. Trace the relevant caller-owned context into the helper: identify
the call site, actual callee entry, the passed SSA value and passing location, and
the corresponding recovered function input. Explain which context field the helper
updates for opening/closing parentheses, where the caller checks that same field,
and how the successful and malformed paths differ. Verify the essential pointer,
field and control-transfer claims against selected machine instructions.
In the final answer, explicitly distinguish the wrapper's routing for helper
return codes 0, 1 and 18, including the malformed and depth-limit diagnostics.

Keep the answer focused on this cross-function state flow. Give function and
instruction addresses and real Evidence references. Distinguish recovered call
slots from original source parameter ordinals, exact storage matches from proven
alias analysis, and local static conditions from demonstrated runtime feasibility.