The Alignment Problem in Constrained Code Generation
Large Language Models (LLMs) have demonstrated strong capabilities in code generation, but their outputs frequently contain syntax or type errors that result in compilation failures. Constrained decoding has been proposed as a solution to mitigate compilation errors by construction, improving functional correctness as a byproduct. However, previous works overlook a critical aspect of constrained decoding: the alignment between constrainer (e.g., types), language model and the target specification language (e.g., TypeScript). Misalignment is caused by the constrainer being incomplete--rejecting programs that belong to the target--or unsound--allowing programs that are not part of the targe...
| Authors | Matteo Biagiola, Jahrim Gabriele Cesario, Luca Di Grazia et al. |
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| Primary category | cs.SE |
| Published | 19 June 2026 |
| Last updated at source | 19 June 2026 |
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