SMT2: skip element enumeration for non-integer-keyed array literals#9062
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SMT2: skip element enumeration for non-integer-keyed array literals#9062tautschnig wants to merge 1 commit into
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Pull request overview
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Adjusts SMT2 array-literal handling to avoid generating invalid index constants for arrays whose index type can’t be constructed from integers, by skipping per-element constraints in that case.
Changes:
- Adds an index-type guard so per-element array constraints are only emitted for integer/bitvector-like index types.
- Documents the rationale and treats non-integer-keyed arrays as unconstrained (sound over-approximation).
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## develop #9062 +/- ##
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Coverage 80.68% 80.69%
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The array-constructor substitute in find_symbols enumerates element indices via from_integer(i, index_type), which can build a constant only for integer/bitvector index types and C enums. Restrict the per-element enumeration to those types: - integer bitvectors (signed/unsignedbv), ID_bv and ID_integer; - ID_c_enum, and ID_c_enum_tag followed to its underlying c_enum (from_integer has no c_enum_tag branch, so the resolved type is used both for the guard and for the from_integer call in the loop). Arrays keyed by some other domain (e.g. Strata's `Map Ref _`, a struct or pointer key) are left unconstrained -- a sound over-approximation -- rather than aborting in from_integer on a non-enumerable index type. Unit tests in unit/solvers/smt2/smt2_conv.cpp cover the preserved integer path, the now-supported c_enum_tag path (which aborts without this change), and the skipped non-scalar (struct) path. Co-authored-by: Kiro <kiro-agent@users.noreply.github.com>
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The array-constructor substitute in find_symbols enumerates element indices via from_integer(i, index_type), which is only valid for integer/bitvector index types. For arrays keyed by a non-scalar type, leave the array unconstrained (a sound over-approximation) rather than constructing an integer constant of a non-integer index type.